Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2019-02-07

The following pull-request contains BPF updates for your *net-next* tree.

The main changes are:

1) Add a riscv64 JIT for BPF, from Björn.

2) Implement BTF deduplication algorithm for libbpf which takes BTF type
   information containing duplicate per-compilation unit information and
   reduces it to an equivalent set of BTF types with no duplication and
   without loss of information, from Andrii.

3) Offloaded and native BPF XDP programs can coexist today, enable also
   offloaded and generic ones as well, from Jakub.

4) Expose various BTF related helper functions in libbpf as API which
   are in particular helpful for JITed programs, from Yonghong.

5) Fix the recently added JMP32 code emission in s390x JIT, from Heiko.

6) Fix BPF kselftests' tcp_{server,client}.py to be able to run inside
   a network namespace, also add a fix for libbpf to get libbpf_print()
   working, from Stanislav.

7) Fixes for bpftool documentation, from Prashant.

8) Type cleanup in BPF kselftests' test_maps.c to silence a gcc8 warning,
   from Breno.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

25 files changed, 2722 insertions, 377 deletions

diff --git a/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst b/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
index d43fce568ef7..9bb9ace54ba8 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
@@ -17,8 +17,8 @@ SYNOPSIS
         *COMMANDS* :=
         { **show** | **list** | **tree** | **attach** | **detach** | **help** }
 
-MAP COMMANDS
-=============
+CGROUP COMMANDS
+===============
 
 |       **bpftool** **cgroup { show | list }** *CGROUP*
 |       **bpftool** **cgroup tree** [*CGROUP_ROOT*]
diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
index 8d489a26e3c9..82de03dd8f52 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-feature.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
@@ -16,8 +16,8 @@ SYNOPSIS
 
         *COMMANDS* := { **probe** | **help** }
 
-MAP COMMANDS
-=============
+FEATURE COMMANDS
+================
 
 |       **bpftool** **feature probe** [*COMPONENT*] [**macros** [**prefix** *PREFIX*]]
 |       **bpftool** **feature help**
diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 13b56102f528..7e59495cb028 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -18,7 +18,7 @@ SYNOPSIS
         { **show** | **list** | **dump xlated** | **dump jited** | **pin** | **load**
         | **loadall** | **help** }
 
-MAP COMMANDS
+PROG COMMANDS
 =============
 
 |       **bpftool** **prog { show | list }** [*PROG*]
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index d682d3b8f7b9..ab6528c935a1 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 /* Copyright (c) 2018 Facebook */
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -9,8 +10,9 @@
 #include <linux/btf.h>
 #include "btf.h"
 #include "bpf.h"
+#include "libbpf.h"
+#include "libbpf_util.h"
 
-#define elog(fmt, ...) { if (err_log) err_log(fmt, ##__VA_ARGS__); }
 #define max(a, b) ((a) > (b) ? (a) : (b))
 #define min(a, b) ((a) < (b) ? (a) : (b))
 
@@ -107,54 +109,54 @@ static int btf_add_type(struct btf *btf, struct btf_type *t)
         return 0;
 }
 
-static int btf_parse_hdr(struct btf *btf, btf_print_fn_t err_log)
+static int btf_parse_hdr(struct btf *btf)
 {
         const struct btf_header *hdr = btf->hdr;
         __u32 meta_left;
 
         if (btf->data_size < sizeof(struct btf_header)) {
-                elog("BTF header not found\n");
+                pr_debug("BTF header not found\n");
                 return -EINVAL;
         }
 
         if (hdr->magic != BTF_MAGIC) {
-                elog("Invalid BTF magic:%x\n", hdr->magic);
+                pr_debug("Invalid BTF magic:%x\n", hdr->magic);
                 return -EINVAL;
         }
 
         if (hdr->version != BTF_VERSION) {
-                elog("Unsupported BTF version:%u\n", hdr->version);
+                pr_debug("Unsupported BTF version:%u\n", hdr->version);
                 return -ENOTSUP;
         }
 
         if (hdr->flags) {
-                elog("Unsupported BTF flags:%x\n", hdr->flags);
+                pr_debug("Unsupported BTF flags:%x\n", hdr->flags);
                 return -ENOTSUP;
         }
 
         meta_left = btf->data_size - sizeof(*hdr);
         if (!meta_left) {
-                elog("BTF has no data\n");
+                pr_debug("BTF has no data\n");
                 return -EINVAL;
         }
 
         if (meta_left < hdr->type_off) {
-                elog("Invalid BTF type section offset:%u\n", hdr->type_off);
+                pr_debug("Invalid BTF type section offset:%u\n", hdr->type_off);
                 return -EINVAL;
         }
 
         if (meta_left < hdr->str_off) {
-                elog("Invalid BTF string section offset:%u\n", hdr->str_off);
+                pr_debug("Invalid BTF string section offset:%u\n", hdr->str_off);
                 return -EINVAL;
         }
 
         if (hdr->type_off >= hdr->str_off) {
-                elog("BTF type section offset >= string section offset. No type?\n");
+                pr_debug("BTF type section offset >= string section offset. No type?\n");
                 return -EINVAL;
         }
 
         if (hdr->type_off & 0x02) {
-                elog("BTF type section is not aligned to 4 bytes\n");
+                pr_debug("BTF type section is not aligned to 4 bytes\n");
                 return -EINVAL;
         }
 
@@ -163,7 +165,7 @@ static int btf_parse_hdr(struct btf *btf, btf_print_fn_t err_log)
         return 0;
 }
 
-static int btf_parse_str_sec(struct btf *btf, btf_print_fn_t err_log)
+static int btf_parse_str_sec(struct btf *btf)
 {
         const struct btf_header *hdr = btf->hdr;
         const char *start = btf->nohdr_data + hdr->str_off;
@@ -171,7 +173,7 @@ static int btf_parse_str_sec(struct btf *btf, btf_print_fn_t err_log)
 
         if (!hdr->str_len || hdr->str_len - 1 > BTF_MAX_NAME_OFFSET ||
             start[0] || end[-1]) {
-                elog("Invalid BTF string section\n");
+                pr_debug("Invalid BTF string section\n");
                 return -EINVAL;
         }
 
@@ -180,7 +182,38 @@ static int btf_parse_str_sec(struct btf *btf, btf_print_fn_t err_log)
         return 0;
 }
 
-static int btf_parse_type_sec(struct btf *btf, btf_print_fn_t err_log)
+static int btf_type_size(struct btf_type *t)
+{
+        int base_size = sizeof(struct btf_type);
+        __u16 vlen = BTF_INFO_VLEN(t->info);
+
+        switch (BTF_INFO_KIND(t->info)) {
+        case BTF_KIND_FWD:
+        case BTF_KIND_CONST:
+        case BTF_KIND_VOLATILE:
+        case BTF_KIND_RESTRICT:
+        case BTF_KIND_PTR:
+        case BTF_KIND_TYPEDEF:
+        case BTF_KIND_FUNC:
+                return base_size;
+        case BTF_KIND_INT:
+                return base_size + sizeof(__u32);
+        case BTF_KIND_ENUM:
+                return base_size + vlen * sizeof(struct btf_enum);
+        case BTF_KIND_ARRAY:
+                return base_size + sizeof(struct btf_array);
+        case BTF_KIND_STRUCT:
+        case BTF_KIND_UNION:
+                return base_size + vlen * sizeof(struct btf_member);
+        case BTF_KIND_FUNC_PROTO:
+                return base_size + vlen * sizeof(struct btf_param);
+        default:
+                pr_debug("Unsupported BTF_KIND:%u\n", BTF_INFO_KIND(t->info));
+                return -EINVAL;
+        }
+}
+
+static int btf_parse_type_sec(struct btf *btf)
 {
         struct btf_header *hdr = btf->hdr;
         void *nohdr_data = btf->nohdr_data;
@@ -189,41 +222,13 @@ static int btf_parse_type_sec(struct btf *btf, btf_print_fn_t err_log)
 
         while (next_type < end_type) {
                 struct btf_type *t = next_type;
-                __u16 vlen = BTF_INFO_VLEN(t->info);
+                int type_size;
                 int err;
 
-                next_type += sizeof(*t);
-                switch (BTF_INFO_KIND(t->info)) {
-                case BTF_KIND_INT:
-                        next_type += sizeof(int);
-                        break;
-                case BTF_KIND_ARRAY:
-                        next_type += sizeof(struct btf_array);
-                        break;
-                case BTF_KIND_STRUCT:
-                case BTF_KIND_UNION:
-                        next_type += vlen * sizeof(struct btf_member);
-                        break;
-                case BTF_KIND_ENUM:
-                        next_type += vlen * sizeof(struct btf_enum);
-                        break;
-                case BTF_KIND_FUNC_PROTO:
-                        next_type += vlen * sizeof(struct btf_param);
-                        break;
-                case BTF_KIND_FUNC:
-                case BTF_KIND_TYPEDEF:
-                case BTF_KIND_PTR:
-                case BTF_KIND_FWD:
-                case BTF_KIND_VOLATILE:
-                case BTF_KIND_CONST:
-                case BTF_KIND_RESTRICT:
-                        break;
-                default:
-                        elog("Unsupported BTF_KIND:%u\n",
-                             BTF_INFO_KIND(t->info));
-                        return -EINVAL;
-                }
-
+                type_size = btf_type_size(t);
+                if (type_size < 0)
+                        return type_size;
+                next_type += type_size;
                 err = btf_add_type(btf, t);
                 if (err)
                         return err;
@@ -232,6 +237,11 @@ static int btf_parse_type_sec(struct btf *btf, btf_print_fn_t err_log)
         return 0;
 }
 
+__u32 btf__get_nr_types(const struct btf *btf)
+{
+        return btf->nr_types;
+}
+
 const struct btf_type *btf__type_by_id(const struct btf *btf, __u32 type_id)
 {
         if (type_id > btf->nr_types)
@@ -250,21 +260,6 @@ static bool btf_type_is_void_or_null(const struct btf_type *t)
         return !t || btf_type_is_void(t);
 }
 
-static __s64 btf_type_size(const struct btf_type *t)
-{
-        switch (BTF_INFO_KIND(t->info)) {
-        case BTF_KIND_INT:
-        case BTF_KIND_STRUCT:
-        case BTF_KIND_UNION:
-        case BTF_KIND_ENUM:
-                return t->size;
-        case BTF_KIND_PTR:
-                return sizeof(void *);
-        default:
-                return -EINVAL;
-        }
-}
-
 #define MAX_RESOLVE_DEPTH 32
 
 __s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
@@ -278,11 +273,16 @@ __s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
         t = btf__type_by_id(btf, type_id);
         for (i = 0; i < MAX_RESOLVE_DEPTH && !btf_type_is_void_or_null(t);
              i++) {
-                size = btf_type_size(t);
-                if (size >= 0)
-                        break;
-
                 switch (BTF_INFO_KIND(t->info)) {
+                case BTF_KIND_INT:
+                case BTF_KIND_STRUCT:
+                case BTF_KIND_UNION:
+                case BTF_KIND_ENUM:
+                        size = t->size;
+                        goto done;
+                case BTF_KIND_PTR:
+                        size = sizeof(void *);
+                        goto done;
                 case BTF_KIND_TYPEDEF:
                 case BTF_KIND_VOLATILE:
                 case BTF_KIND_CONST:
@@ -306,6 +306,7 @@ __s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
         if (size < 0)
                 return -EINVAL;
 
+done:
         if (nelems && size > UINT32_MAX / nelems)
                 return -E2BIG;
 
@@ -363,7 +364,7 @@ void btf__free(struct btf *btf)
         free(btf);
 }
 
-struct btf *btf__new(__u8 *data, __u32 size, btf_print_fn_t err_log)
+struct btf *btf__new(__u8 *data, __u32 size)
 {
         __u32 log_buf_size = 0;
         char *log_buf = NULL;
@@ -376,16 +377,15 @@ struct btf *btf__new(__u8 *data, __u32 size, btf_print_fn_t err_log)
 
         btf->fd = -1;
 
-        if (err_log) {
-                log_buf = malloc(BPF_LOG_BUF_SIZE);
-                if (!log_buf) {
-                        err = -ENOMEM;
-                        goto done;
-                }
-                *log_buf = 0;
-                log_buf_size = BPF_LOG_BUF_SIZE;
+        log_buf = malloc(BPF_LOG_BUF_SIZE);
+        if (!log_buf) {
+                err = -ENOMEM;
+                goto done;
         }
 
+        *log_buf = 0;
+        log_buf_size = BPF_LOG_BUF_SIZE;
+
         btf->data = malloc(size);
         if (!btf->data) {
                 err = -ENOMEM;
@@ -400,21 +400,21 @@ struct btf *btf__new(__u8 *data, __u32 size, btf_print_fn_t err_log)
 
         if (btf->fd == -1) {
                 err = -errno;
-                elog("Error loading BTF: %s(%d)\n", strerror(errno), errno);
+                pr_warning("Error loading BTF: %s(%d)\n", strerror(errno), errno);
                 if (log_buf && *log_buf)
-                        elog("%s\n", log_buf);
+                        pr_warning("%s\n", log_buf);
                 goto done;
         }
 
-        err = btf_parse_hdr(btf, err_log);
+        err = btf_parse_hdr(btf);
         if (err)
                 goto done;
 
-        err = btf_parse_str_sec(btf, err_log);
+        err = btf_parse_str_sec(btf);
         if (err)
                 goto done;
 
-        err = btf_parse_type_sec(btf, err_log);
+        err = btf_parse_type_sec(btf);
 
 done:
         free(log_buf);
@@ -432,6 +432,13 @@ int btf__fd(const struct btf *btf)
         return btf->fd;
 }
 
+void btf__get_strings(const struct btf *btf, const char **strings,
+                      __u32 *str_len)
+{
+        *strings = btf->strings;
+        *str_len = btf->hdr->str_len;
+}
+
 const char *btf__name_by_offset(const struct btf *btf, __u32 offset)
 {
         if (offset < btf->hdr->str_len)
@@ -491,7 +498,7 @@ int btf__get_from_id(__u32 id, struct btf **btf)
                 goto exit_free;
         }
 
-        *btf = btf__new((__u8 *)(long)btf_info.btf, btf_info.btf_size, NULL);
+        *btf = btf__new((__u8 *)(long)btf_info.btf, btf_info.btf_size);
         if (IS_ERR(*btf)) {
                 err = PTR_ERR(*btf);
                 *btf = NULL;
@@ -504,6 +511,78 @@ exit_free:
         return err;
 }
 
+int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
+                         __u32 expected_key_size, __u32 expected_value_size,
+                         __u32 *key_type_id, __u32 *value_type_id)
+{
+        const struct btf_type *container_type;
+        const struct btf_member *key, *value;
+        const size_t max_name = 256;
+        char container_name[max_name];
+        __s64 key_size, value_size;
+        __s32 container_id;
+
+        if (snprintf(container_name, max_name, "____btf_map_%s", map_name) ==
+            max_name) {
+                pr_warning("map:%s length of '____btf_map_%s' is too long\n",
+                           map_name, map_name);
+                return -EINVAL;
+        }
+
+        container_id = btf__find_by_name(btf, container_name);
+        if (container_id < 0) {
+                pr_debug("map:%s container_name:%s cannot be found in BTF. Missing BPF_ANNOTATE_KV_PAIR?\n",
+                         map_name, container_name);
+                return container_id;
+        }
+
+        container_type = btf__type_by_id(btf, container_id);
+        if (!container_type) {
+                pr_warning("map:%s cannot find BTF type for container_id:%u\n",
+                           map_name, container_id);
+                return -EINVAL;
+        }
+
+        if (BTF_INFO_KIND(container_type->info) != BTF_KIND_STRUCT ||
+            BTF_INFO_VLEN(container_type->info) < 2) {
+                pr_warning("map:%s container_name:%s is an invalid container struct\n",
+                           map_name, container_name);
+                return -EINVAL;
+        }
+
+        key = (struct btf_member *)(container_type + 1);
+        value = key + 1;
+
+        key_size = btf__resolve_size(btf, key->type);
+        if (key_size < 0) {
+                pr_warning("map:%s invalid BTF key_type_size\n", map_name);
+                return key_size;
+        }
+
+        if (expected_key_size != key_size) {
+                pr_warning("map:%s btf_key_type_size:%u != map_def_key_size:%u\n",
+                           map_name, (__u32)key_size, expected_key_size);
+                return -EINVAL;
+        }
+
+        value_size = btf__resolve_size(btf, value->type);
+        if (value_size < 0) {
+                pr_warning("map:%s invalid BTF value_type_size\n", map_name);
+                return value_size;
+        }
+
+        if (expected_value_size != value_size) {
+                pr_warning("map:%s btf_value_type_size:%u != map_def_value_size:%u\n",
+                           map_name, (__u32)value_size, expected_value_size);
+                return -EINVAL;
+        }
+
+        *key_type_id = key->type;
+        *value_type_id = value->type;
+
+        return 0;
+}
+
 struct btf_ext_sec_copy_param {
         __u32 off;
         __u32 len;
@@ -514,8 +593,7 @@ struct btf_ext_sec_copy_param {
 
 static int btf_ext_copy_info(struct btf_ext *btf_ext,
                              __u8 *data, __u32 data_size,
-                             struct btf_ext_sec_copy_param *ext_sec,
-                             btf_print_fn_t err_log)
+                             struct btf_ext_sec_copy_param *ext_sec)
 {
         const struct btf_ext_header *hdr = (struct btf_ext_header *)data;
         const struct btf_ext_info_sec *sinfo;
@@ -529,14 +607,14 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
         data_size -= hdr->hdr_len;
 
         if (ext_sec->off & 0x03) {
-                elog(".BTF.ext %s section is not aligned to 4 bytes\n",
+                pr_debug(".BTF.ext %s section is not aligned to 4 bytes\n",
                      ext_sec->desc);
                 return -EINVAL;
         }
 
         if (data_size < ext_sec->off ||
             ext_sec->len > data_size - ext_sec->off) {
-                elog("%s section (off:%u len:%u) is beyond the end of the ELF section .BTF.ext\n",
+                pr_debug("%s section (off:%u len:%u) is beyond the end of the ELF section .BTF.ext\n",
                      ext_sec->desc, ext_sec->off, ext_sec->len);
                 return -EINVAL;
         }
@@ -546,7 +624,7 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
 
         /* At least a record size */
         if (info_left < sizeof(__u32)) {
-                elog(".BTF.ext %s record size not found\n", ext_sec->desc);
+                pr_debug(".BTF.ext %s record size not found\n", ext_sec->desc);
                 return -EINVAL;
         }
 
@@ -554,7 +632,7 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
         record_size = *(__u32 *)info;
         if (record_size < ext_sec->min_rec_size ||
             record_size & 0x03) {
-                elog("%s section in .BTF.ext has invalid record size %u\n",
+                pr_debug("%s section in .BTF.ext has invalid record size %u\n",
                      ext_sec->desc, record_size);
                 return -EINVAL;
         }
@@ -564,7 +642,7 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
 
         /* If no records, return failure now so .BTF.ext won't be used. */
         if (!info_left) {
-                elog("%s section in .BTF.ext has no records", ext_sec->desc);
+                pr_debug("%s section in .BTF.ext has no records", ext_sec->desc);
                 return -EINVAL;
         }
 
@@ -574,14 +652,14 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
                 __u32 num_records;
 
                 if (info_left < sec_hdrlen) {
-                        elog("%s section header is not found in .BTF.ext\n",
+                        pr_debug("%s section header is not found in .BTF.ext\n",
                              ext_sec->desc);
                         return -EINVAL;
                 }
 
                 num_records = sinfo->num_info;
                 if (num_records == 0) {
-                        elog("%s section has incorrect num_records in .BTF.ext\n",
+                        pr_debug("%s section has incorrect num_records in .BTF.ext\n",
                              ext_sec->desc);
                         return -EINVAL;
                 }
@@ -589,7 +667,7 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
                 total_record_size = sec_hdrlen +
                                     (__u64)num_records * record_size;
                 if (info_left < total_record_size) {
-                        elog("%s section has incorrect num_records in .BTF.ext\n",
+                        pr_debug("%s section has incorrect num_records in .BTF.ext\n",
                              ext_sec->desc);
                         return -EINVAL;
                 }
@@ -610,8 +688,7 @@ static int btf_ext_copy_info(struct btf_ext *btf_ext,
 }
 
 static int btf_ext_copy_func_info(struct btf_ext *btf_ext,
-                                  __u8 *data, __u32 data_size,
-                                  btf_print_fn_t err_log)
+                                  __u8 *data, __u32 data_size)
 {
         const struct btf_ext_header *hdr = (struct btf_ext_header *)data;
         struct btf_ext_sec_copy_param param = {
@@ -622,12 +699,11 @@ static int btf_ext_copy_func_info(struct btf_ext *btf_ext,
                 .desc = "func_info"
         };
 
-        return btf_ext_copy_info(btf_ext, data, data_size, &param, err_log);
+        return btf_ext_copy_info(btf_ext, data, data_size, &param);
 }
 
 static int btf_ext_copy_line_info(struct btf_ext *btf_ext,
-                                  __u8 *data, __u32 data_size,
-                                  btf_print_fn_t err_log)
+                                  __u8 *data, __u32 data_size)
 {
         const struct btf_ext_header *hdr = (struct btf_ext_header *)data;
         struct btf_ext_sec_copy_param param = {
@@ -638,37 +714,36 @@ static int btf_ext_copy_line_info(struct btf_ext *btf_ext,
                 .desc = "line_info",
         };
 
-        return btf_ext_copy_info(btf_ext, data, data_size, &param, err_log);
+        return btf_ext_copy_info(btf_ext, data, data_size, &param);
 }
 
-static int btf_ext_parse_hdr(__u8 *data, __u32 data_size,
-                             btf_print_fn_t err_log)
+static int btf_ext_parse_hdr(__u8 *data, __u32 data_size)
 {
         const struct btf_ext_header *hdr = (struct btf_ext_header *)data;
 
         if (data_size < offsetof(struct btf_ext_header, func_info_off) ||
             data_size < hdr->hdr_len) {
-                elog("BTF.ext header not found");
+                pr_debug("BTF.ext header not found");
                 return -EINVAL;
         }
 
         if (hdr->magic != BTF_MAGIC) {
-                elog("Invalid BTF.ext magic:%x\n", hdr->magic);
+                pr_debug("Invalid BTF.ext magic:%x\n", hdr->magic);
                 return -EINVAL;
         }
 
         if (hdr->version != BTF_VERSION) {
-                elog("Unsupported BTF.ext version:%u\n", hdr->version);
+                pr_debug("Unsupported BTF.ext version:%u\n", hdr->version);
                 return -ENOTSUP;
         }
 
         if (hdr->flags) {
-                elog("Unsupported BTF.ext flags:%x\n", hdr->flags);
+                pr_debug("Unsupported BTF.ext flags:%x\n", hdr->flags);
                 return -ENOTSUP;
         }
 
         if (data_size == hdr->hdr_len) {
-                elog("BTF.ext has no data\n");
+                pr_debug("BTF.ext has no data\n");
                 return -EINVAL;
         }
 
@@ -685,12 +760,12 @@ void btf_ext__free(struct btf_ext *btf_ext)
         free(btf_ext);
 }
 
-struct btf_ext *btf_ext__new(__u8 *data, __u32 size, btf_print_fn_t err_log)
+struct btf_ext *btf_ext__new(__u8 *data, __u32 size)
 {
         struct btf_ext *btf_ext;
         int err;
 
-        err = btf_ext_parse_hdr(data, size, err_log);
+        err = btf_ext_parse_hdr(data, size);
         if (err)
                 return ERR_PTR(err);
 
@@ -698,13 +773,13 @@ struct btf_ext *btf_ext__new(__u8 *data, __u32 size, btf_print_fn_t err_log)
         if (!btf_ext)
                 return ERR_PTR(-ENOMEM);
 
-        err = btf_ext_copy_func_info(btf_ext, data, size, err_log);
+        err = btf_ext_copy_func_info(btf_ext, data, size);
         if (err) {
                 btf_ext__free(btf_ext);
                 return ERR_PTR(err);
         }
 
-        err = btf_ext_copy_line_info(btf_ext, data, size, err_log);
+        err = btf_ext_copy_line_info(btf_ext, data, size);
         if (err) {
                 btf_ext__free(btf_ext);
                 return ERR_PTR(err);
@@ -786,3 +861,1744 @@ __u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext)
 {
         return btf_ext->line_info.rec_size;
 }
+
+struct btf_dedup;
+
+static struct btf_dedup *btf_dedup_new(struct btf *btf, struct btf_ext *btf_ext,
+                                       const struct btf_dedup_opts *opts);
+static void btf_dedup_free(struct btf_dedup *d);
+static int btf_dedup_strings(struct btf_dedup *d);
+static int btf_dedup_prim_types(struct btf_dedup *d);
+static int btf_dedup_struct_types(struct btf_dedup *d);
+static int btf_dedup_ref_types(struct btf_dedup *d);
+static int btf_dedup_compact_types(struct btf_dedup *d);
+static int btf_dedup_remap_types(struct btf_dedup *d);
+
+/*
+ * Deduplicate BTF types and strings.
+ *
+ * BTF dedup algorithm takes as an input `struct btf` representing `.BTF` ELF
+ * section with all BTF type descriptors and string data. It overwrites that
+ * memory in-place with deduplicated types and strings without any loss of
+ * information. If optional `struct btf_ext` representing '.BTF.ext' ELF section
+ * is provided, all the strings referenced from .BTF.ext section are honored
+ * and updated to point to the right offsets after deduplication.
+ *
+ * If function returns with error, type/string data might be garbled and should
+ * be discarded.
+ *
+ * More verbose and detailed description of both problem btf_dedup is solving,
+ * as well as solution could be found at:
+ * https://facebookmicrosites.github.io/bpf/blog/2018/11/14/btf-enhancement.html
+ *
+ * Problem description and justification
+ * =====================================
+ *
+ * BTF type information is typically emitted either as a result of conversion
+ * from DWARF to BTF or directly by compiler. In both cases, each compilation
+ * unit contains information about a subset of all the types that are used
+ * in an application. These subsets are frequently overlapping and contain a lot
+ * of duplicated information when later concatenated together into a single
+ * binary. This algorithm ensures that each unique type is represented by single
+ * BTF type descriptor, greatly reducing resulting size of BTF data.
+ *
+ * Compilation unit isolation and subsequent duplication of data is not the only
+ * problem. The same type hierarchy (e.g., struct and all the type that struct
+ * references) in different compilation units can be represented in BTF to
+ * various degrees of completeness (or, rather, incompleteness) due to
+ * struct/union forward declarations.
+ *
+ * Let's take a look at an example, that we'll use to better understand the
+ * problem (and solution). Suppose we have two compilation units, each using
+ * same `struct S`, but each of them having incomplete type information about
+ * struct's fields:
+ *
+ * // CU #1:
+ * struct S;
+ * struct A {
+ *      int a;
+ *      struct A* self;
+ *      struct S* parent;
+ * };
+ * struct B;
+ * struct S {
+ *      struct A* a_ptr;
+ *      struct B* b_ptr;
+ * };
+ *
+ * // CU #2:
+ * struct S;
+ * struct A;
+ * struct B {
+ *      int b;
+ *      struct B* self;
+ *      struct S* parent;
+ * };
+ * struct S {
+ *      struct A* a_ptr;
+ *      struct B* b_ptr;
+ * };
+ *
+ * In case of CU #1, BTF data will know only that `struct B` exist (but no
+ * more), but will know the complete type information about `struct A`. While
+ * for CU #2, it will know full type information about `struct B`, but will
+ * only know about forward declaration of `struct A` (in BTF terms, it will
+ * have `BTF_KIND_FWD` type descriptor with name `B`).
+ *
+ * This compilation unit isolation means that it's possible that there is no
+ * single CU with complete type information describing structs `S`, `A`, and
+ * `B`. Also, we might get tons of duplicated and redundant type information.
+ *
+ * Additional complication we need to keep in mind comes from the fact that
+ * types, in general, can form graphs containing cycles, not just DAGs.
+ *
+ * While algorithm does deduplication, it also merges and resolves type
+ * information (unless disabled throught `struct btf_opts`), whenever possible.
+ * E.g., in the example above with two compilation units having partial type
+ * information for structs `A` and `B`, the output of algorithm will emit
+ * a single copy of each BTF type that describes structs `A`, `B`, and `S`
+ * (as well as type information for `int` and pointers), as if they were defined
+ * in a single compilation unit as:
+ *
+ * struct A {
+ *      int a;
+ *      struct A* self;
+ *      struct S* parent;
+ * };
+ * struct B {
+ *      int b;
+ *      struct B* self;
+ *      struct S* parent;
+ * };
+ * struct S {
+ *      struct A* a_ptr;
+ *      struct B* b_ptr;
+ * };
+ *
+ * Algorithm summary
+ * =================
+ *
+ * Algorithm completes its work in 6 separate passes:
+ *
+ * 1. Strings deduplication.
+ * 2. Primitive types deduplication (int, enum, fwd).
+ * 3. Struct/union types deduplication.
+ * 4. Reference types deduplication (pointers, typedefs, arrays, funcs, func
+ *    protos, and const/volatile/restrict modifiers).
+ * 5. Types compaction.
+ * 6. Types remapping.
+ *
+ * Algorithm determines canonical type descriptor, which is a single
+ * representative type for each truly unique type. This canonical type is the
+ * one that will go into final deduplicated BTF type information. For
+ * struct/unions, it is also the type that algorithm will merge additional type
+ * information into (while resolving FWDs), as it discovers it from data in
+ * other CUs. Each input BTF type eventually gets either mapped to itself, if
+ * that type is canonical, or to some other type, if that type is equivalent
+ * and was chosen as canonical representative. This mapping is stored in
+ * `btf_dedup->map` array. This map is also used to record STRUCT/UNION that
+ * FWD type got resolved to.
+ *
+ * To facilitate fast discovery of canonical types, we also maintain canonical
+ * index (`btf_dedup->dedup_table`), which maps type descriptor's signature hash
+ * (i.e., hashed kind, name, size, fields, etc) into a list of canonical types
+ * that match that signature. With sufficiently good choice of type signature
+ * hashing function, we can limit number of canonical types for each unique type
+ * signature to a very small number, allowing to find canonical type for any
+ * duplicated type very quickly.
+ *
+ * Struct/union deduplication is the most critical part and algorithm for
+ * deduplicating structs/unions is described in greater details in comments for
+ * `btf_dedup_is_equiv` function.
+ */
+int btf__dedup(struct btf *btf, struct btf_ext *btf_ext,
+               const struct btf_dedup_opts *opts)
+{
+        struct btf_dedup *d = btf_dedup_new(btf, btf_ext, opts);
+        int err;
+
+        if (IS_ERR(d)) {
+                pr_debug("btf_dedup_new failed: %ld", PTR_ERR(d));
+                return -EINVAL;
+        }
+
+        err = btf_dedup_strings(d);
+        if (err < 0) {
+                pr_debug("btf_dedup_strings failed:%d\n", err);
+                goto done;
+        }
+        err = btf_dedup_prim_types(d);
+        if (err < 0) {
+                pr_debug("btf_dedup_prim_types failed:%d\n", err);
+                goto done;
+        }
+        err = btf_dedup_struct_types(d);
+        if (err < 0) {
+                pr_debug("btf_dedup_struct_types failed:%d\n", err);
+                goto done;
+        }
+        err = btf_dedup_ref_types(d);
+        if (err < 0) {
+                pr_debug("btf_dedup_ref_types failed:%d\n", err);
+                goto done;
+        }
+        err = btf_dedup_compact_types(d);
+        if (err < 0) {
+                pr_debug("btf_dedup_compact_types failed:%d\n", err);
+                goto done;
+        }
+        err = btf_dedup_remap_types(d);
+        if (err < 0) {
+                pr_debug("btf_dedup_remap_types failed:%d\n", err);
+                goto done;
+        }
+
+done:
+        btf_dedup_free(d);
+        return err;
+}
+
+#define BTF_DEDUP_TABLE_SIZE_LOG 14
+#define BTF_DEDUP_TABLE_MOD ((1 << BTF_DEDUP_TABLE_SIZE_LOG) - 1)
+#define BTF_UNPROCESSED_ID ((__u32)-1)
+#define BTF_IN_PROGRESS_ID ((__u32)-2)
+
+struct btf_dedup_node {
+        struct btf_dedup_node *next;
+        __u32 type_id;
+};
+
+struct btf_dedup {
+        /* .BTF section to be deduped in-place */
+        struct btf *btf;
+        /*
+         * Optional .BTF.ext section. When provided, any strings referenced
+         * from it will be taken into account when deduping strings
+         */
+        struct btf_ext *btf_ext;
+        /*
+         * This is a map from any type's signature hash to a list of possible
+         * canonical representative type candidates. Hash collisions are
+         * ignored, so even types of various kinds can share same list of
+         * candidates, which is fine because we rely on subsequent
+         * btf_xxx_equal() checks to authoritatively verify type equality.
+         */
+        struct btf_dedup_node **dedup_table;
+        /* Canonical types map */
+        __u32 *map;
+        /* Hypothetical mapping, used during type graph equivalence checks */
+        __u32 *hypot_map;
+        __u32 *hypot_list;
+        size_t hypot_cnt;
+        size_t hypot_cap;
+        /* Various option modifying behavior of algorithm */
+        struct btf_dedup_opts opts;
+};
+
+struct btf_str_ptr {
+        const char *str;
+        __u32 new_off;
+        bool used;
+};
+
+struct btf_str_ptrs {
+        struct btf_str_ptr *ptrs;
+        const char *data;
+        __u32 cnt;
+        __u32 cap;
+};
+
+static inline __u32 hash_combine(__u32 h, __u32 value)
+{
+/* 2^31 + 2^29 - 2^25 + 2^22 - 2^19 - 2^16 + 1 */
+#define GOLDEN_RATIO_PRIME 0x9e370001UL
+        return h * 37 + value * GOLDEN_RATIO_PRIME;
+#undef GOLDEN_RATIO_PRIME
+}
+
+#define for_each_hash_node(table, hash, node) \
+        for (node = table[hash & BTF_DEDUP_TABLE_MOD]; node; node = node->next)
+
+static int btf_dedup_table_add(struct btf_dedup *d, __u32 hash, __u32 type_id)
+{
+        struct btf_dedup_node *node = malloc(sizeof(struct btf_dedup_node));
+
+        if (!node)
+                return -ENOMEM;
+        node->type_id = type_id;
+        node->next = d->dedup_table[hash & BTF_DEDUP_TABLE_MOD];
+        d->dedup_table[hash & BTF_DEDUP_TABLE_MOD] = node;
+        return 0;
+}
+
+static int btf_dedup_hypot_map_add(struct btf_dedup *d,
+                                   __u32 from_id, __u32 to_id)
+{
+        if (d->hypot_cnt == d->hypot_cap) {
+                __u32 *new_list;
+
+                d->hypot_cap += max(16, d->hypot_cap / 2);
+                new_list = realloc(d->hypot_list, sizeof(__u32) * d->hypot_cap);
+                if (!new_list)
+                        return -ENOMEM;
+                d->hypot_list = new_list;
+        }
+        d->hypot_list[d->hypot_cnt++] = from_id;
+        d->hypot_map[from_id] = to_id;
+        return 0;
+}
+
+static void btf_dedup_clear_hypot_map(struct btf_dedup *d)
+{
+        int i;
+
+        for (i = 0; i < d->hypot_cnt; i++)
+                d->hypot_map[d->hypot_list[i]] = BTF_UNPROCESSED_ID;
+        d->hypot_cnt = 0;
+}
+
+static void btf_dedup_table_free(struct btf_dedup *d)
+{
+        struct btf_dedup_node *head, *tmp;
+        int i;
+
+        if (!d->dedup_table)
+                return;
+
+        for (i = 0; i < (1 << BTF_DEDUP_TABLE_SIZE_LOG); i++) {
+                while (d->dedup_table[i]) {
+                        tmp = d->dedup_table[i];
+                        d->dedup_table[i] = tmp->next;
+                        free(tmp);
+                }
+
+                head = d->dedup_table[i];
+                while (head) {
+                        tmp = head;
+                        head = head->next;
+                        free(tmp);
+                }
+        }
+
+        free(d->dedup_table);
+        d->dedup_table = NULL;
+}
+
+static void btf_dedup_free(struct btf_dedup *d)
+{
+        btf_dedup_table_free(d);
+
+        free(d->map);
+        d->map = NULL;
+
+        free(d->hypot_map);
+        d->hypot_map = NULL;
+
+        free(d->hypot_list);
+        d->hypot_list = NULL;
+
+        free(d);
+}
+
+static struct btf_dedup *btf_dedup_new(struct btf *btf, struct btf_ext *btf_ext,
+                                       const struct btf_dedup_opts *opts)
+{
+        struct btf_dedup *d = calloc(1, sizeof(struct btf_dedup));
+        int i, err = 0;
+
+        if (!d)
+                return ERR_PTR(-ENOMEM);
+
+        d->btf = btf;
+        d->btf_ext = btf_ext;
+
+        d->dedup_table = calloc(1 << BTF_DEDUP_TABLE_SIZE_LOG,
+                                sizeof(struct btf_dedup_node *));
+        if (!d->dedup_table) {
+                err = -ENOMEM;
+                goto done;
+        }
+
+        d->map = malloc(sizeof(__u32) * (1 + btf->nr_types));
+        if (!d->map) {
+                err = -ENOMEM;
+                goto done;
+        }
+        /* special BTF "void" type is made canonical immediately */
+        d->map[0] = 0;
+        for (i = 1; i <= btf->nr_types; i++)
+                d->map[i] = BTF_UNPROCESSED_ID;
+
+        d->hypot_map = malloc(sizeof(__u32) * (1 + btf->nr_types));
+        if (!d->hypot_map) {
+                err = -ENOMEM;
+                goto done;
+        }
+        for (i = 0; i <= btf->nr_types; i++)
+                d->hypot_map[i] = BTF_UNPROCESSED_ID;
+
+        d->opts.dont_resolve_fwds = opts && opts->dont_resolve_fwds;
+
+done:
+        if (err) {
+                btf_dedup_free(d);
+                return ERR_PTR(err);
+        }
+
+        return d;
+}
+
+typedef int (*str_off_fn_t)(__u32 *str_off_ptr, void *ctx);
+
+/*
+ * Iterate over all possible places in .BTF and .BTF.ext that can reference
+ * string and pass pointer to it to a provided callback `fn`.
+ */
+static int btf_for_each_str_off(struct btf_dedup *d, str_off_fn_t fn, void *ctx)
+{
+        void *line_data_cur, *line_data_end;
+        int i, j, r, rec_size;
+        struct btf_type *t;
+
+        for (i = 1; i <= d->btf->nr_types; i++) {
+                t = d->btf->types[i];
+                r = fn(&t->name_off, ctx);
+                if (r)
+                        return r;
+
+                switch (BTF_INFO_KIND(t->info)) {
+                case BTF_KIND_STRUCT:
+                case BTF_KIND_UNION: {
+                        struct btf_member *m = (struct btf_member *)(t + 1);
+                        __u16 vlen = BTF_INFO_VLEN(t->info);
+
+                        for (j = 0; j < vlen; j++) {
+                                r = fn(&m->name_off, ctx);
+                                if (r)
+                                        return r;
+                                m++;
+                        }
+                        break;
+                }
+                case BTF_KIND_ENUM: {
+                        struct btf_enum *m = (struct btf_enum *)(t + 1);
+                        __u16 vlen = BTF_INFO_VLEN(t->info);
+
+                        for (j = 0; j < vlen; j++) {
+                                r = fn(&m->name_off, ctx);
+                                if (r)
+                                        return r;
+                                m++;
+                        }
+                        break;
+                }
+                case BTF_KIND_FUNC_PROTO: {
+                        struct btf_param *m = (struct btf_param *)(t + 1);
+                        __u16 vlen = BTF_INFO_VLEN(t->info);
+
+                        for (j = 0; j < vlen; j++) {
+                                r = fn(&m->name_off, ctx);
+                                if (r)
+                                        return r;
+                                m++;
+                        }
+                        break;
+                }
+                default:
+                        break;
+                }
+        }
+
+        if (!d->btf_ext)
+                return 0;
+
+        line_data_cur = d->btf_ext->line_info.info;
+        line_data_end = d->btf_ext->line_info.info + d->btf_ext->line_info.len;
+        rec_size = d->btf_ext->line_info.rec_size;
+
+        while (line_data_cur < line_data_end) {
+                struct btf_ext_info_sec *sec = line_data_cur;
+                struct bpf_line_info_min *line_info;
+                __u32 num_info = sec->num_info;
+
+                r = fn(&sec->sec_name_off, ctx);
+                if (r)
+                        return r;
+
+                line_data_cur += sizeof(struct btf_ext_info_sec);
+                for (i = 0; i < num_info; i++) {
+                        line_info = line_data_cur;
+                        r = fn(&line_info->file_name_off, ctx);
+                        if (r)
+                                return r;
+                        r = fn(&line_info->line_off, ctx);
+                        if (r)
+                                return r;
+                        line_data_cur += rec_size;
+                }
+        }
+
+        return 0;
+}
+
+static int str_sort_by_content(const void *a1, const void *a2)
+{
+        const struct btf_str_ptr *p1 = a1;
+        const struct btf_str_ptr *p2 = a2;
+
+        return strcmp(p1->str, p2->str);
+}
+
+static int str_sort_by_offset(const void *a1, const void *a2)
+{
+        const struct btf_str_ptr *p1 = a1;
+        const struct btf_str_ptr *p2 = a2;
+
+        if (p1->str != p2->str)
+                return p1->str < p2->str ? -1 : 1;
+        return 0;
+}
+
+static int btf_dedup_str_ptr_cmp(const void *str_ptr, const void *pelem)
+{
+        const struct btf_str_ptr *p = pelem;
+
+        if (str_ptr != p->str)
+                return (const char *)str_ptr < p->str ? -1 : 1;
+        return 0;
+}
+
+static int btf_str_mark_as_used(__u32 *str_off_ptr, void *ctx)
+{
+        struct btf_str_ptrs *strs;
+        struct btf_str_ptr *s;
+
+        if (*str_off_ptr == 0)
+                return 0;
+
+        strs = ctx;
+        s = bsearch(strs->data + *str_off_ptr, strs->ptrs, strs->cnt,
+                    sizeof(struct btf_str_ptr), btf_dedup_str_ptr_cmp);
+        if (!s)
+                return -EINVAL;
+        s->used = true;
+        return 0;
+}
+
+static int btf_str_remap_offset(__u32 *str_off_ptr, void *ctx)
+{
+        struct btf_str_ptrs *strs;
+        struct btf_str_ptr *s;
+
+        if (*str_off_ptr == 0)
+                return 0;
+
+        strs = ctx;
+        s = bsearch(strs->data + *str_off_ptr, strs->ptrs, strs->cnt,
+                    sizeof(struct btf_str_ptr), btf_dedup_str_ptr_cmp);
+        if (!s)
+                return -EINVAL;
+        *str_off_ptr = s->new_off;
+        return 0;
+}
+
+/*
+ * Dedup string and filter out those that are not referenced from either .BTF
+ * or .BTF.ext (if provided) sections.
+ *
+ * This is done by building index of all strings in BTF's string section,
+ * then iterating over all entities that can reference strings (e.g., type
+ * names, struct field names, .BTF.ext line info, etc) and marking corresponding
+ * strings as used. After that all used strings are deduped and compacted into
+ * sequential blob of memory and new offsets are calculated. Then all the string
+ * references are iterated again and rewritten using new offsets.
+ */
+static int btf_dedup_strings(struct btf_dedup *d)
+{
+        const struct btf_header *hdr = d->btf->hdr;
+        char *start = (char *)d->btf->nohdr_data + hdr->str_off;
+        char *end = start + d->btf->hdr->str_len;
+        char *p = start, *tmp_strs = NULL;
+        struct btf_str_ptrs strs = {
+                .cnt = 0,
+                .cap = 0,
+                .ptrs = NULL,
+                .data = start,
+        };
+        int i, j, err = 0, grp_idx;
+        bool grp_used;
+
+        /* build index of all strings */
+        while (p < end) {
+                if (strs.cnt + 1 > strs.cap) {
+                        struct btf_str_ptr *new_ptrs;
+
+                        strs.cap += max(strs.cnt / 2, 16);
+                        new_ptrs = realloc(strs.ptrs,
+                                           sizeof(strs.ptrs[0]) * strs.cap);
+                        if (!new_ptrs) {
+                                err = -ENOMEM;
+                                goto done;
+                        }
+                        strs.ptrs = new_ptrs;
+                }
+
+                strs.ptrs[strs.cnt].str = p;
+                strs.ptrs[strs.cnt].used = false;
+
+                p += strlen(p) + 1;
+                strs.cnt++;
+        }
+
+        /* temporary storage for deduplicated strings */
+        tmp_strs = malloc(d->btf->hdr->str_len);
+        if (!tmp_strs) {
+                err = -ENOMEM;
+                goto done;
+        }
+
+        /* mark all used strings */
+        strs.ptrs[0].used = true;
+        err = btf_for_each_str_off(d, btf_str_mark_as_used, &strs);
+        if (err)
+                goto done;
+
+        /* sort strings by context, so that we can identify duplicates */
+        qsort(strs.ptrs, strs.cnt, sizeof(strs.ptrs[0]), str_sort_by_content);
+
+        /*
+         * iterate groups of equal strings and if any instance in a group was
+         * referenced, emit single instance and remember new offset
+         */
+        p = tmp_strs;
+        grp_idx = 0;
+        grp_used = strs.ptrs[0].used;
+        /* iterate past end to avoid code duplication after loop */
+        for (i = 1; i <= strs.cnt; i++) {
+                /*
+                 * when i == strs.cnt, we want to skip string comparison and go
+                 * straight to handling last group of strings (otherwise we'd
+                 * need to handle last group after the loop w/ duplicated code)
+                 */
+                if (i < strs.cnt &&
+                    !strcmp(strs.ptrs[i].str, strs.ptrs[grp_idx].str)) {
+                        grp_used = grp_used || strs.ptrs[i].used;
+                        continue;
+                }
+
+                /*
+                 * this check would have been required after the loop to handle
+                 * last group of strings, but due to <= condition in a loop
+                 * we avoid that duplication
+                 */
+                if (grp_used) {
+                        int new_off = p - tmp_strs;
+                        __u32 len = strlen(strs.ptrs[grp_idx].str);
+
+                        memmove(p, strs.ptrs[grp_idx].str, len + 1);
+                        for (j = grp_idx; j < i; j++)
+                                strs.ptrs[j].new_off = new_off;
+                        p += len + 1;
+                }
+
+                if (i < strs.cnt) {
+                        grp_idx = i;
+                        grp_used = strs.ptrs[i].used;
+                }
+        }
+
+        /* replace original strings with deduped ones */
+        d->btf->hdr->str_len = p - tmp_strs;
+        memmove(start, tmp_strs, d->btf->hdr->str_len);
+        end = start + d->btf->hdr->str_len;
+
+        /* restore original order for further binary search lookups */
+        qsort(strs.ptrs, strs.cnt, sizeof(strs.ptrs[0]), str_sort_by_offset);
+
+        /* remap string offsets */
+        err = btf_for_each_str_off(d, btf_str_remap_offset, &strs);
+        if (err)
+                goto done;
+
+        d->btf->hdr->str_len = end - start;
+
+done:
+        free(tmp_strs);
+        free(strs.ptrs);
+        return err;
+}
+
+static __u32 btf_hash_common(struct btf_type *t)
+{
+        __u32 h;
+
+        h = hash_combine(0, t->name_off);
+        h = hash_combine(h, t->info);
+        h = hash_combine(h, t->size);
+        return h;
+}
+
+static bool btf_equal_common(struct btf_type *t1, struct btf_type *t2)
+{
+        return t1->name_off == t2->name_off &&
+               t1->info == t2->info &&
+               t1->size == t2->size;
+}
+
+/* Calculate type signature hash of INT. */
+static __u32 btf_hash_int(struct btf_type *t)
+{
+        __u32 info = *(__u32 *)(t + 1);
+        __u32 h;
+
+        h = btf_hash_common(t);
+        h = hash_combine(h, info);
+        return h;
+}
+
+/* Check structural equality of two INTs. */
+static bool btf_equal_int(struct btf_type *t1, struct btf_type *t2)
+{
+        __u32 info1, info2;
+
+        if (!btf_equal_common(t1, t2))
+                return false;
+        info1 = *(__u32 *)(t1 + 1);
+        info2 = *(__u32 *)(t2 + 1);
+        return info1 == info2;
+}
+
+/* Calculate type signature hash of ENUM. */
+static __u32 btf_hash_enum(struct btf_type *t)
+{
+        struct btf_enum *member = (struct btf_enum *)(t + 1);
+        __u32 vlen = BTF_INFO_VLEN(t->info);
+        __u32 h = btf_hash_common(t);
+        int i;
+
+        for (i = 0; i < vlen; i++) {
+                h = hash_combine(h, member->name_off);
+                h = hash_combine(h, member->val);
+                member++;
+        }
+        return h;
+}
+
+/* Check structural equality of two ENUMs. */
+static bool btf_equal_enum(struct btf_type *t1, struct btf_type *t2)
+{
+        struct btf_enum *m1, *m2;
+        __u16 vlen;
+        int i;
+
+        if (!btf_equal_common(t1, t2))
+                return false;
+
+        vlen = BTF_INFO_VLEN(t1->info);
+        m1 = (struct btf_enum *)(t1 + 1);
+        m2 = (struct btf_enum *)(t2 + 1);
+        for (i = 0; i < vlen; i++) {
+                if (m1->name_off != m2->name_off || m1->val != m2->val)
+                        return false;
+                m1++;
+                m2++;
+        }
+        return true;
+}
+
+/*
+ * Calculate type signature hash of STRUCT/UNION, ignoring referenced type IDs,
+ * as referenced type IDs equivalence is established separately during type
+ * graph equivalence check algorithm.
+ */
+static __u32 btf_hash_struct(struct btf_type *t)
+{
+        struct btf_member *member = (struct btf_member *)(t + 1);
+        __u32 vlen = BTF_INFO_VLEN(t->info);
+        __u32 h = btf_hash_common(t);
+        int i;
+
+        for (i = 0; i < vlen; i++) {
+                h = hash_combine(h, member->name_off);
+                h = hash_combine(h, member->offset);
+                /* no hashing of referenced type ID, it can be unresolved yet */
+                member++;
+        }
+        return h;
+}
+
+/*
+ * Check structural compatibility of two FUNC_PROTOs, ignoring referenced type
+ * IDs. This check is performed during type graph equivalence check and
+ * referenced types equivalence is checked separately.
+ */
+static bool btf_equal_struct(struct btf_type *t1, struct btf_type *t2)
+{
+        struct btf_member *m1, *m2;
+        __u16 vlen;
+        int i;
+
+        if (!btf_equal_common(t1, t2))
+                return false;
+
+        vlen = BTF_INFO_VLEN(t1->info);
+        m1 = (struct btf_member *)(t1 + 1);
+        m2 = (struct btf_member *)(t2 + 1);
+        for (i = 0; i < vlen; i++) {
+                if (m1->name_off != m2->name_off || m1->offset != m2->offset)
+                        return false;
+                m1++;
+                m2++;
+        }
+        return true;
+}
+
+/*
+ * Calculate type signature hash of ARRAY, including referenced type IDs,
+ * under assumption that they were already resolved to canonical type IDs and
+ * are not going to change.
+ */
+static __u32 btf_hash_array(struct btf_type *t)
+{
+        struct btf_array *info = (struct btf_array *)(t + 1);
+        __u32 h = btf_hash_common(t);
+
+        h = hash_combine(h, info->type);
+        h = hash_combine(h, info->index_type);
+        h = hash_combine(h, info->nelems);
+        return h;
+}
+
+/*
+ * Check exact equality of two ARRAYs, taking into account referenced
+ * type IDs, under assumption that they were already resolved to canonical
+ * type IDs and are not going to change.
+ * This function is called during reference types deduplication to compare
+ * ARRAY to potential canonical representative.
+ */
+static bool btf_equal_array(struct btf_type *t1, struct btf_type *t2)
+{
+        struct btf_array *info1, *info2;
+
+        if (!btf_equal_common(t1, t2))
+                return false;
+
+        info1 = (struct btf_array *)(t1 + 1);
+        info2 = (struct btf_array *)(t2 + 1);
+        return info1->type == info2->type &&
+               info1->index_type == info2->index_type &&
+               info1->nelems == info2->nelems;
+}
+
+/*
+ * Check structural compatibility of two ARRAYs, ignoring referenced type
+ * IDs. This check is performed during type graph equivalence check and
+ * referenced types equivalence is checked separately.
+ */
+static bool btf_compat_array(struct btf_type *t1, struct btf_type *t2)
+{
+        struct btf_array *info1, *info2;
+
+        if (!btf_equal_common(t1, t2))
+                return false;
+
+        info1 = (struct btf_array *)(t1 + 1);
+        info2 = (struct btf_array *)(t2 + 1);
+        return info1->nelems == info2->nelems;
+}
+
+/*
+ * Calculate type signature hash of FUNC_PROTO, including referenced type IDs,
+ * under assumption that they were already resolved to canonical type IDs and
+ * are not going to change.
+ */
+static inline __u32 btf_hash_fnproto(struct btf_type *t)
+{
+        struct btf_param *member = (struct btf_param *)(t + 1);
+        __u16 vlen = BTF_INFO_VLEN(t->info);
+        __u32 h = btf_hash_common(t);
+        int i;
+
+        for (i = 0; i < vlen; i++) {
+                h = hash_combine(h, member->name_off);
+                h = hash_combine(h, member->type);
+                member++;
+        }
+        return h;
+}
+
+/*
+ * Check exact equality of two FUNC_PROTOs, taking into account referenced
+ * type IDs, under assumption that they were already resolved to canonical
+ * type IDs and are not going to change.
+ * This function is called during reference types deduplication to compare
+ * FUNC_PROTO to potential canonical representative.
+ */
+static inline bool btf_equal_fnproto(struct btf_type *t1, struct btf_type *t2)
+{
+        struct btf_param *m1, *m2;
+        __u16 vlen;
+        int i;
+
+        if (!btf_equal_common(t1, t2))
+                return false;
+
+        vlen = BTF_INFO_VLEN(t1->info);
+        m1 = (struct btf_param *)(t1 + 1);
+        m2 = (struct btf_param *)(t2 + 1);
+        for (i = 0; i < vlen; i++) {
+                if (m1->name_off != m2->name_off || m1->type != m2->type)
+                        return false;
+                m1++;
+                m2++;
+        }
+        return true;
+}
+
+/*
+ * Check structural compatibility of two FUNC_PROTOs, ignoring referenced type
+ * IDs. This check is performed during type graph equivalence check and
+ * referenced types equivalence is checked separately.
+ */
+static inline bool btf_compat_fnproto(struct btf_type *t1, struct btf_type *t2)
+{
+        struct btf_param *m1, *m2;
+        __u16 vlen;
+        int i;
+
+        /* skip return type ID */
+        if (t1->name_off != t2->name_off || t1->info != t2->info)
+                return false;
+
+        vlen = BTF_INFO_VLEN(t1->info);
+        m1 = (struct btf_param *)(t1 + 1);
+        m2 = (struct btf_param *)(t2 + 1);
+        for (i = 0; i < vlen; i++) {
+                if (m1->name_off != m2->name_off)
+                        return false;
+                m1++;
+                m2++;
+        }
+        return true;
+}
+
+/*
+ * Deduplicate primitive types, that can't reference other types, by calculating
+ * their type signature hash and comparing them with any possible canonical
+ * candidate. If no canonical candidate matches, type itself is marked as
+ * canonical and is added into `btf_dedup->dedup_table` as another candidate.
+ */
+static int btf_dedup_prim_type(struct btf_dedup *d, __u32 type_id)
+{
+        struct btf_type *t = d->btf->types[type_id];
+        struct btf_type *cand;
+        struct btf_dedup_node *cand_node;
+        /* if we don't find equivalent type, then we are canonical */
+        __u32 new_id = type_id;
+        __u32 h;
+
+        switch (BTF_INFO_KIND(t->info)) {
+        case BTF_KIND_CONST:
+        case BTF_KIND_VOLATILE:
+        case BTF_KIND_RESTRICT:
+        case BTF_KIND_PTR:
+        case BTF_KIND_TYPEDEF:
+        case BTF_KIND_ARRAY:
+        case BTF_KIND_STRUCT:
+        case BTF_KIND_UNION:
+        case BTF_KIND_FUNC:
+        case BTF_KIND_FUNC_PROTO:
+                return 0;
+
+        case BTF_KIND_INT:
+                h = btf_hash_int(t);
+                for_each_hash_node(d->dedup_table, h, cand_node) {
+                        cand = d->btf->types[cand_node->type_id];
+                        if (btf_equal_int(t, cand)) {
+                                new_id = cand_node->type_id;
+                                break;
+                        }
+                }
+                break;
+
+        case BTF_KIND_ENUM:
+                h = btf_hash_enum(t);
+                for_each_hash_node(d->dedup_table, h, cand_node) {
+                        cand = d->btf->types[cand_node->type_id];
+                        if (btf_equal_enum(t, cand)) {
+                                new_id = cand_node->type_id;
+                                break;
+                        }
+                }
+                break;
+
+        case BTF_KIND_FWD:
+                h = btf_hash_common(t);
+                for_each_hash_node(d->dedup_table, h, cand_node) {
+                        cand = d->btf->types[cand_node->type_id];
+                        if (btf_equal_common(t, cand)) {
+                                new_id = cand_node->type_id;
+                                break;
+                        }
+                }
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        d->map[type_id] = new_id;
+        if (type_id == new_id && btf_dedup_table_add(d, h, type_id))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int btf_dedup_prim_types(struct btf_dedup *d)
+{
+        int i, err;
+
+        for (i = 1; i <= d->btf->nr_types; i++) {
+                err = btf_dedup_prim_type(d, i);
+                if (err)
+                        return err;
+        }
+        return 0;
+}
+
+/*
+ * Check whether type is already mapped into canonical one (could be to itself).
+ */
+static inline bool is_type_mapped(struct btf_dedup *d, uint32_t type_id)
+{
+        return d->map[type_id] <= BTF_MAX_TYPE;
+}
+
+/*
+ * Resolve type ID into its canonical type ID, if any; otherwise return original
+ * type ID. If type is FWD and is resolved into STRUCT/UNION already, follow
+ * STRUCT/UNION link and resolve it into canonical type ID as well.
+ */
+static inline __u32 resolve_type_id(struct btf_dedup *d, __u32 type_id)
+{
+        while (is_type_mapped(d, type_id) && d->map[type_id] != type_id)
+                type_id = d->map[type_id];
+        return type_id;
+}
+
+/*
+ * Resolve FWD to underlying STRUCT/UNION, if any; otherwise return original
+ * type ID.
+ */
+static uint32_t resolve_fwd_id(struct btf_dedup *d, uint32_t type_id)
+{
+        __u32 orig_type_id = type_id;
+
+        if (BTF_INFO_KIND(d->btf->types[type_id]->info) != BTF_KIND_FWD)
+                return type_id;
+
+        while (is_type_mapped(d, type_id) && d->map[type_id] != type_id)
+                type_id = d->map[type_id];
+
+        if (BTF_INFO_KIND(d->btf->types[type_id]->info) != BTF_KIND_FWD)
+                return type_id;
+
+        return orig_type_id;
+}
+
+
+static inline __u16 btf_fwd_kind(struct btf_type *t)
+{
+        return BTF_INFO_KFLAG(t->info) ? BTF_KIND_UNION : BTF_KIND_STRUCT;
+}
+
+/*
+ * Check equivalence of BTF type graph formed by candidate struct/union (we'll
+ * call it "candidate graph" in this description for brevity) to a type graph
+ * formed by (potential) canonical struct/union ("canonical graph" for brevity
+ * here, though keep in mind that not all types in canonical graph are
+ * necessarily canonical representatives themselves, some of them might be
+ * duplicates or its uniqueness might not have been established yet).
+ * Returns:
+ *  - >0, if type graphs are equivalent;
+ *  -  0, if not equivalent;
+ *  - <0, on error.
+ *
+ * Algorithm performs side-by-side DFS traversal of both type graphs and checks
+ * equivalence of BTF types at each step. If at any point BTF types in candidate
+ * and canonical graphs are not compatible structurally, whole graphs are
+ * incompatible. If types are structurally equivalent (i.e., all information
+ * except referenced type IDs is exactly the same), a mapping from `canon_id` to
+ * a `cand_id` is recored in hypothetical mapping (`btf_dedup->hypot_map`).
+ * If a type references other types, then those referenced types are checked
+ * for equivalence recursively.
+ *
+ * During DFS traversal, if we find that for current `canon_id` type we
+ * already have some mapping in hypothetical map, we check for two possible
+ * situations:
+ *   - `canon_id` is mapped to exactly the same type as `cand_id`. This will
+ *     happen when type graphs have cycles. In this case we assume those two
+ *     types are equivalent.
+ *   - `canon_id` is mapped to different type. This is contradiction in our
+ *     hypothetical mapping, because same graph in canonical graph corresponds
+ *     to two different types in candidate graph, which for equivalent type
+ *     graphs shouldn't happen. This condition terminates equivalence check
+ *     with negative result.
+ *
+ * If type graphs traversal exhausts types to check and find no contradiction,
+ * then type graphs are equivalent.
+ *
+ * When checking types for equivalence, there is one special case: FWD types.
+ * If FWD type resolution is allowed and one of the types (either from canonical
+ * or candidate graph) is FWD and other is STRUCT/UNION (depending on FWD's kind
+ * flag) and their names match, hypothetical mapping is updated to point from
+ * FWD to STRUCT/UNION. If graphs will be determined as equivalent successfully,
+ * this mapping will be used to record FWD -> STRUCT/UNION mapping permanently.
+ *
+ * Technically, this could lead to incorrect FWD to STRUCT/UNION resolution,
+ * if there are two exactly named (or anonymous) structs/unions that are
+ * compatible structurally, one of which has FWD field, while other is concrete
+ * STRUCT/UNION, but according to C sources they are different structs/unions
+ * that are referencing different types with the same name. This is extremely
+ * unlikely to happen, but btf_dedup API allows to disable FWD resolution if
+ * this logic is causing problems.
+ *
+ * Doing FWD resolution means that both candidate and/or canonical graphs can
+ * consists of portions of the graph that come from multiple compilation units.
+ * This is due to the fact that types within single compilation unit are always
+ * deduplicated and FWDs are already resolved, if referenced struct/union
+ * definiton is available. So, if we had unresolved FWD and found corresponding
+ * STRUCT/UNION, they will be from different compilation units. This
+ * consequently means that when we "link" FWD to corresponding STRUCT/UNION,
+ * type graph will likely have at least two different BTF types that describe
+ * same type (e.g., most probably there will be two different BTF types for the
+ * same 'int' primitive type) and could even have "overlapping" parts of type
+ * graph that describe same subset of types.
+ *
+ * This in turn means that our assumption that each type in canonical graph
+ * must correspond to exactly one type in candidate graph might not hold
+ * anymore and will make it harder to detect contradictions using hypothetical
+ * map. To handle this problem, we allow to follow FWD -> STRUCT/UNION
+ * resolution only in canonical graph. FWDs in candidate graphs are never
+ * resolved. To see why it's OK, let's check all possible situations w.r.t. FWDs
+ * that can occur:
+ *   - Both types in canonical and candidate graphs are FWDs. If they are
+ *     structurally equivalent, then they can either be both resolved to the
+ *     same STRUCT/UNION or not resolved at all. In both cases they are
+ *     equivalent and there is no need to resolve FWD on candidate side.
+ *   - Both types in canonical and candidate graphs are concrete STRUCT/UNION,
+ *     so nothing to resolve as well, algorithm will check equivalence anyway.
+ *   - Type in canonical graph is FWD, while type in candidate is concrete
+ *     STRUCT/UNION. In this case candidate graph comes from single compilation
+ *     unit, so there is exactly one BTF type for each unique C type. After
+ *     resolving FWD into STRUCT/UNION, there might be more than one BTF type
+ *     in canonical graph mapping to single BTF type in candidate graph, but
+ *     because hypothetical mapping maps from canonical to candidate types, it's
+ *     alright, and we still maintain the property of having single `canon_id`
+ *     mapping to single `cand_id` (there could be two different `canon_id`
+ *     mapped to the same `cand_id`, but it's not contradictory).
+ *   - Type in canonical graph is concrete STRUCT/UNION, while type in candidate
+ *     graph is FWD. In this case we are just going to check compatibility of
+ *     STRUCT/UNION and corresponding FWD, and if they are compatible, we'll
+ *     assume that whatever STRUCT/UNION FWD resolves to must be equivalent to
+ *     a concrete STRUCT/UNION from canonical graph. If the rest of type graphs
+ *     turn out equivalent, we'll re-resolve FWD to concrete STRUCT/UNION from
+ *     canonical graph.
+ */
+static int btf_dedup_is_equiv(struct btf_dedup *d, __u32 cand_id,
+                              __u32 canon_id)
+{
+        struct btf_type *cand_type;
+        struct btf_type *canon_type;
+        __u32 hypot_type_id;
+        __u16 cand_kind;
+        __u16 canon_kind;
+        int i, eq;
+
+        /* if both resolve to the same canonical, they must be equivalent */
+        if (resolve_type_id(d, cand_id) == resolve_type_id(d, canon_id))
+                return 1;
+
+        canon_id = resolve_fwd_id(d, canon_id);
+
+        hypot_type_id = d->hypot_map[canon_id];
+        if (hypot_type_id <= BTF_MAX_TYPE)
+                return hypot_type_id == cand_id;
+
+        if (btf_dedup_hypot_map_add(d, canon_id, cand_id))
+                return -ENOMEM;
+
+        cand_type = d->btf->types[cand_id];
+        canon_type = d->btf->types[canon_id];
+        cand_kind = BTF_INFO_KIND(cand_type->info);
+        canon_kind = BTF_INFO_KIND(canon_type->info);
+
+        if (cand_type->name_off != canon_type->name_off)
+                return 0;
+
+        /* FWD <--> STRUCT/UNION equivalence check, if enabled */
+        if (!d->opts.dont_resolve_fwds
+            && (cand_kind == BTF_KIND_FWD || canon_kind == BTF_KIND_FWD)
+            && cand_kind != canon_kind) {
+                __u16 real_kind;
+                __u16 fwd_kind;
+
+                if (cand_kind == BTF_KIND_FWD) {
+                        real_kind = canon_kind;
+                        fwd_kind = btf_fwd_kind(cand_type);
+                } else {
+                        real_kind = cand_kind;
+                        fwd_kind = btf_fwd_kind(canon_type);
+                }
+                return fwd_kind == real_kind;
+        }
+
+        if (cand_type->info != canon_type->info)
+                return 0;
+
+        switch (cand_kind) {
+        case BTF_KIND_INT:
+                return btf_equal_int(cand_type, canon_type);
+
+        case BTF_KIND_ENUM:
+                return btf_equal_enum(cand_type, canon_type);
+
+        case BTF_KIND_FWD:
+                return btf_equal_common(cand_type, canon_type);
+
+        case BTF_KIND_CONST:
+        case BTF_KIND_VOLATILE:
+        case BTF_KIND_RESTRICT:
+        case BTF_KIND_PTR:
+        case BTF_KIND_TYPEDEF:
+        case BTF_KIND_FUNC:
+                return btf_dedup_is_equiv(d, cand_type->type, canon_type->type);
+
+        case BTF_KIND_ARRAY: {
+                struct btf_array *cand_arr, *canon_arr;
+
+                if (!btf_compat_array(cand_type, canon_type))
+                        return 0;
+                cand_arr = (struct btf_array *)(cand_type + 1);
+                canon_arr = (struct btf_array *)(canon_type + 1);
+                eq = btf_dedup_is_equiv(d,
+                        cand_arr->index_type, canon_arr->index_type);
+                if (eq <= 0)
+                        return eq;
+                return btf_dedup_is_equiv(d, cand_arr->type, canon_arr->type);
+        }
+
+        case BTF_KIND_STRUCT:
+        case BTF_KIND_UNION: {
+                struct btf_member *cand_m, *canon_m;
+                __u16 vlen;
+
+                if (!btf_equal_struct(cand_type, canon_type))
+                        return 0;
+                vlen = BTF_INFO_VLEN(cand_type->info);
+                cand_m = (struct btf_member *)(cand_type + 1);
+                canon_m = (struct btf_member *)(canon_type + 1);
+                for (i = 0; i < vlen; i++) {
+                        eq = btf_dedup_is_equiv(d, cand_m->type, canon_m->type);
+                        if (eq <= 0)
+                                return eq;
+                        cand_m++;
+                        canon_m++;
+                }
+
+                return 1;
+        }
+
+        case BTF_KIND_FUNC_PROTO: {
+                struct btf_param *cand_p, *canon_p;
+                __u16 vlen;
+
+                if (!btf_compat_fnproto(cand_type, canon_type))
+                        return 0;
+                eq = btf_dedup_is_equiv(d, cand_type->type, canon_type->type);
+                if (eq <= 0)
+                        return eq;
+                vlen = BTF_INFO_VLEN(cand_type->info);
+                cand_p = (struct btf_param *)(cand_type + 1);
+                canon_p = (struct btf_param *)(canon_type + 1);
+                for (i = 0; i < vlen; i++) {
+                        eq = btf_dedup_is_equiv(d, cand_p->type, canon_p->type);
+                        if (eq <= 0)
+                                return eq;
+                        cand_p++;
+                        canon_p++;
+                }
+                return 1;
+        }
+
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+/*
+ * Use hypothetical mapping, produced by successful type graph equivalence
+ * check, to augment existing struct/union canonical mapping, where possible.
+ *
+ * If BTF_KIND_FWD resolution is allowed, this mapping is also used to record
+ * FWD -> STRUCT/UNION correspondence as well. FWD resolution is bidirectional:
+ * it doesn't matter if FWD type was part of canonical graph or candidate one,
+ * we are recording the mapping anyway. As opposed to carefulness required
+ * for struct/union correspondence mapping (described below), for FWD resolution
+ * it's not important, as by the time that FWD type (reference type) will be
+ * deduplicated all structs/unions will be deduped already anyway.
+ *
+ * Recording STRUCT/UNION mapping is purely a performance optimization and is
+ * not required for correctness. It needs to be done carefully to ensure that
+ * struct/union from candidate's type graph is not mapped into corresponding
+ * struct/union from canonical type graph that itself hasn't been resolved into
+ * canonical representative. The only guarantee we have is that canonical
+ * struct/union was determined as canonical and that won't change. But any
+ * types referenced through that struct/union fields could have been not yet
+ * resolved, so in case like that it's too early to establish any kind of
+ * correspondence between structs/unions.
+ *
+ * No canonical correspondence is derived for primitive types (they are already
+ * deduplicated completely already anyway) or reference types (they rely on
+ * stability of struct/union canonical relationship for equivalence checks).
+ */
+static void btf_dedup_merge_hypot_map(struct btf_dedup *d)
+{
+        __u32 cand_type_id, targ_type_id;
+        __u16 t_kind, c_kind;
+        __u32 t_id, c_id;
+        int i;
+
+        for (i = 0; i < d->hypot_cnt; i++) {
+                cand_type_id = d->hypot_list[i];
+                targ_type_id = d->hypot_map[cand_type_id];
+                t_id = resolve_type_id(d, targ_type_id);
+                c_id = resolve_type_id(d, cand_type_id);
+                t_kind = BTF_INFO_KIND(d->btf->types[t_id]->info);
+                c_kind = BTF_INFO_KIND(d->btf->types[c_id]->info);
+                /*
+                 * Resolve FWD into STRUCT/UNION.
+                 * It's ok to resolve FWD into STRUCT/UNION that's not yet
+                 * mapped to canonical representative (as opposed to
+                 * STRUCT/UNION <--> STRUCT/UNION mapping logic below), because
+                 * eventually that struct is going to be mapped and all resolved
+                 * FWDs will automatically resolve to correct canonical
+                 * representative. This will happen before ref type deduping,
+                 * which critically depends on stability of these mapping. This
+                 * stability is not a requirement for STRUCT/UNION equivalence
+                 * checks, though.
+                 */
+                if (t_kind != BTF_KIND_FWD && c_kind == BTF_KIND_FWD)
+                        d->map[c_id] = t_id;
+                else if (t_kind == BTF_KIND_FWD && c_kind != BTF_KIND_FWD)
+                        d->map[t_id] = c_id;
+
+                if ((t_kind == BTF_KIND_STRUCT || t_kind == BTF_KIND_UNION) &&
+                    c_kind != BTF_KIND_FWD &&
+                    is_type_mapped(d, c_id) &&
+                    !is_type_mapped(d, t_id)) {
+                        /*
+                         * as a perf optimization, we can map struct/union
+                         * that's part of type graph we just verified for
+                         * equivalence. We can do that for struct/union that has
+                         * canonical representative only, though.
+                         */
+                        d->map[t_id] = c_id;
+                }
+        }
+}
+
+/*
+ * Deduplicate struct/union types.
+ *
+ * For each struct/union type its type signature hash is calculated, taking
+ * into account type's name, size, number, order and names of fields, but
+ * ignoring type ID's referenced from fields, because they might not be deduped
+ * completely until after reference types deduplication phase. This type hash
+ * is used to iterate over all potential canonical types, sharing same hash.
+ * For each canonical candidate we check whether type graphs that they form
+ * (through referenced types in fields and so on) are equivalent using algorithm
+ * implemented in `btf_dedup_is_equiv`. If such equivalence is found and
+ * BTF_KIND_FWD resolution is allowed, then hypothetical mapping
+ * (btf_dedup->hypot_map) produced by aforementioned type graph equivalence
+ * algorithm is used to record FWD -> STRUCT/UNION mapping. It's also used to
+ * potentially map other structs/unions to their canonical representatives,
+ * if such relationship hasn't yet been established. This speeds up algorithm
+ * by eliminating some of the duplicate work.
+ *
+ * If no matching canonical representative was found, struct/union is marked
+ * as canonical for itself and is added into btf_dedup->dedup_table hash map
+ * for further look ups.
+ */
+static int btf_dedup_struct_type(struct btf_dedup *d, __u32 type_id)
+{
+        struct btf_dedup_node *cand_node;
+        struct btf_type *t;
+        /* if we don't find equivalent type, then we are canonical */
+        __u32 new_id = type_id;
+        __u16 kind;
+        __u32 h;
+
+        /* already deduped or is in process of deduping (loop detected) */
+        if (d->map[type_id] <= BTF_MAX_TYPE)
+                return 0;
+
+        t = d->btf->types[type_id];
+        kind = BTF_INFO_KIND(t->info);
+
+        if (kind != BTF_KIND_STRUCT && kind != BTF_KIND_UNION)
+                return 0;
+
+        h = btf_hash_struct(t);
+        for_each_hash_node(d->dedup_table, h, cand_node) {
+                int eq;
+
+                btf_dedup_clear_hypot_map(d);
+                eq = btf_dedup_is_equiv(d, type_id, cand_node->type_id);
+                if (eq < 0)
+                        return eq;
+                if (!eq)
+                        continue;
+                new_id = cand_node->type_id;
+                btf_dedup_merge_hypot_map(d);
+                break;
+        }
+
+        d->map[type_id] = new_id;
+        if (type_id == new_id && btf_dedup_table_add(d, h, type_id))
+                return -ENOMEM;
+
+        return 0;
+}
+
+static int btf_dedup_struct_types(struct btf_dedup *d)
+{
+        int i, err;
+
+        for (i = 1; i <= d->btf->nr_types; i++) {
+                err = btf_dedup_struct_type(d, i);
+                if (err)
+                        return err;
+        }
+        return 0;
+}
+
+/*
+ * Deduplicate reference type.
+ *
+ * Once all primitive and struct/union types got deduplicated, we can easily
+ * deduplicate all other (reference) BTF types. This is done in two steps:
+ *
+ * 1. Resolve all referenced type IDs into their canonical type IDs. This
+ * resolution can be done either immediately for primitive or struct/union types
+ * (because they were deduped in previous two phases) or recursively for
+ * reference types. Recursion will always terminate at either primitive or
+ * struct/union type, at which point we can "unwind" chain of reference types
+ * one by one. There is no danger of encountering cycles because in C type
+ * system the only way to form type cycle is through struct/union, so any chain
+ * of reference types, even those taking part in a type cycle, will inevitably
+ * reach struct/union at some point.
+ *
+ * 2. Once all referenced type IDs are resolved into canonical ones, BTF type
+ * becomes "stable", in the sense that no further deduplication will cause
+ * any changes to it. With that, it's now possible to calculate type's signature
+ * hash (this time taking into account referenced type IDs) and loop over all
+ * potential canonical representatives. If no match was found, current type
+ * will become canonical representative of itself and will be added into
+ * btf_dedup->dedup_table as another possible canonical representative.
+ */
+static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
+{
+        struct btf_dedup_node *cand_node;
+        struct btf_type *t, *cand;
+        /* if we don't find equivalent type, then we are representative type */
+        __u32 new_id = type_id;
+        __u32 h, ref_type_id;
+
+        if (d->map[type_id] == BTF_IN_PROGRESS_ID)
+                return -ELOOP;
+        if (d->map[type_id] <= BTF_MAX_TYPE)
+                return resolve_type_id(d, type_id);
+
+        t = d->btf->types[type_id];
+        d->map[type_id] = BTF_IN_PROGRESS_ID;
+
+        switch (BTF_INFO_KIND(t->info)) {
+        case BTF_KIND_CONST:
+        case BTF_KIND_VOLATILE:
+        case BTF_KIND_RESTRICT:
+        case BTF_KIND_PTR:
+        case BTF_KIND_TYPEDEF:
+        case BTF_KIND_FUNC:
+                ref_type_id = btf_dedup_ref_type(d, t->type);
+                if (ref_type_id < 0)
+                        return ref_type_id;
+                t->type = ref_type_id;
+
+                h = btf_hash_common(t);
+                for_each_hash_node(d->dedup_table, h, cand_node) {
+                        cand = d->btf->types[cand_node->type_id];
+                        if (btf_equal_common(t, cand)) {
+                                new_id = cand_node->type_id;
+                                break;
+                        }
+                }
+                break;
+
+        case BTF_KIND_ARRAY: {
+                struct btf_array *info = (struct btf_array *)(t + 1);
+
+                ref_type_id = btf_dedup_ref_type(d, info->type);
+                if (ref_type_id < 0)
+                        return ref_type_id;
+                info->type = ref_type_id;
+
+                ref_type_id = btf_dedup_ref_type(d, info->index_type);
+                if (ref_type_id < 0)
+                        return ref_type_id;
+                info->index_type = ref_type_id;
+
+                h = btf_hash_array(t);
+                for_each_hash_node(d->dedup_table, h, cand_node) {
+                        cand = d->btf->types[cand_node->type_id];
+                        if (btf_equal_array(t, cand)) {
+                                new_id = cand_node->type_id;
+                                break;
+                        }
+                }
+                break;
+        }
+
+        case BTF_KIND_FUNC_PROTO: {
+                struct btf_param *param;
+                __u16 vlen;
+                int i;
+
+                ref_type_id = btf_dedup_ref_type(d, t->type);
+                if (ref_type_id < 0)
+                        return ref_type_id;
+                t->type = ref_type_id;
+
+                vlen = BTF_INFO_VLEN(t->info);
+                param = (struct btf_param *)(t + 1);
+                for (i = 0; i < vlen; i++) {
+                        ref_type_id = btf_dedup_ref_type(d, param->type);
+                        if (ref_type_id < 0)
+                                return ref_type_id;
+                        param->type = ref_type_id;
+                        param++;
+                }
+
+                h = btf_hash_fnproto(t);
+                for_each_hash_node(d->dedup_table, h, cand_node) {
+                        cand = d->btf->types[cand_node->type_id];
+                        if (btf_equal_fnproto(t, cand)) {
+                                new_id = cand_node->type_id;
+                                break;
+                        }
+                }
+                break;
+        }
+
+        default:
+                return -EINVAL;
+        }
+
+        d->map[type_id] = new_id;
+        if (type_id == new_id && btf_dedup_table_add(d, h, type_id))
+                return -ENOMEM;
+
+        return new_id;
+}
+
+static int btf_dedup_ref_types(struct btf_dedup *d)
+{
+        int i, err;
+
+        for (i = 1; i <= d->btf->nr_types; i++) {
+                err = btf_dedup_ref_type(d, i);
+                if (err < 0)
+                        return err;
+        }
+        btf_dedup_table_free(d);
+        return 0;
+}
+
+/*
+ * Compact types.
+ *
+ * After we established for each type its corresponding canonical representative
+ * type, we now can eliminate types that are not canonical and leave only
+ * canonical ones layed out sequentially in memory by copying them over
+ * duplicates. During compaction btf_dedup->hypot_map array is reused to store
+ * a map from original type ID to a new compacted type ID, which will be used
+ * during next phase to "fix up" type IDs, referenced from struct/union and
+ * reference types.
+ */
+static int btf_dedup_compact_types(struct btf_dedup *d)
+{
+        struct btf_type **new_types;
+        __u32 next_type_id = 1;
+        char *types_start, *p;
+        int i, len;
+
+        /* we are going to reuse hypot_map to store compaction remapping */
+        d->hypot_map[0] = 0;
+        for (i = 1; i <= d->btf->nr_types; i++)
+                d->hypot_map[i] = BTF_UNPROCESSED_ID;
+
+        types_start = d->btf->nohdr_data + d->btf->hdr->type_off;
+        p = types_start;
+
+        for (i = 1; i <= d->btf->nr_types; i++) {
+                if (d->map[i] != i)
+                        continue;
+
+                len = btf_type_size(d->btf->types[i]);
+                if (len < 0)
+                        return len;
+
+                memmove(p, d->btf->types[i], len);
+                d->hypot_map[i] = next_type_id;
+                d->btf->types[next_type_id] = (struct btf_type *)p;
+                p += len;
+                next_type_id++;
+        }
+
+        /* shrink struct btf's internal types index and update btf_header */
+        d->btf->nr_types = next_type_id - 1;
+        d->btf->types_size = d->btf->nr_types;
+        d->btf->hdr->type_len = p - types_start;
+        new_types = realloc(d->btf->types,
+                            (1 + d->btf->nr_types) * sizeof(struct btf_type *));
+        if (!new_types)
+                return -ENOMEM;
+        d->btf->types = new_types;
+
+        /* make sure string section follows type information without gaps */
+        d->btf->hdr->str_off = p - (char *)d->btf->nohdr_data;
+        memmove(p, d->btf->strings, d->btf->hdr->str_len);
+        d->btf->strings = p;
+        p += d->btf->hdr->str_len;
+
+        d->btf->data_size = p - (char *)d->btf->data;
+        return 0;
+}
+
+/*
+ * Figure out final (deduplicated and compacted) type ID for provided original
+ * `type_id` by first resolving it into corresponding canonical type ID and
+ * then mapping it to a deduplicated type ID, stored in btf_dedup->hypot_map,
+ * which is populated during compaction phase.
+ */
+static int btf_dedup_remap_type_id(struct btf_dedup *d, __u32 type_id)
+{
+        __u32 resolved_type_id, new_type_id;
+
+        resolved_type_id = resolve_type_id(d, type_id);
+        new_type_id = d->hypot_map[resolved_type_id];
+        if (new_type_id > BTF_MAX_TYPE)
+                return -EINVAL;
+        return new_type_id;
+}
+
+/*
+ * Remap referenced type IDs into deduped type IDs.
+ *
+ * After BTF types are deduplicated and compacted, their final type IDs may
+ * differ from original ones. The map from original to a corresponding
+ * deduped type ID is stored in btf_dedup->hypot_map and is populated during
+ * compaction phase. During remapping phase we are rewriting all type IDs
+ * referenced from any BTF type (e.g., struct fields, func proto args, etc) to
+ * their final deduped type IDs.
+ */
+static int btf_dedup_remap_type(struct btf_dedup *d, __u32 type_id)
+{
+        struct btf_type *t = d->btf->types[type_id];
+        int i, r;
+
+        switch (BTF_INFO_KIND(t->info)) {
+        case BTF_KIND_INT:
+        case BTF_KIND_ENUM:
+                break;
+
+        case BTF_KIND_FWD:
+        case BTF_KIND_CONST:
+        case BTF_KIND_VOLATILE:
+        case BTF_KIND_RESTRICT:
+        case BTF_KIND_PTR:
+        case BTF_KIND_TYPEDEF:
+        case BTF_KIND_FUNC:
+                r = btf_dedup_remap_type_id(d, t->type);
+                if (r < 0)
+                        return r;
+                t->type = r;
+                break;
+
+        case BTF_KIND_ARRAY: {
+                struct btf_array *arr_info = (struct btf_array *)(t + 1);
+
+                r = btf_dedup_remap_type_id(d, arr_info->type);
+                if (r < 0)
+                        return r;
+                arr_info->type = r;
+                r = btf_dedup_remap_type_id(d, arr_info->index_type);
+                if (r < 0)
+                        return r;
+                arr_info->index_type = r;
+                break;
+        }
+
+        case BTF_KIND_STRUCT:
+        case BTF_KIND_UNION: {
+                struct btf_member *member = (struct btf_member *)(t + 1);
+                __u16 vlen = BTF_INFO_VLEN(t->info);
+
+                for (i = 0; i < vlen; i++) {
+                        r = btf_dedup_remap_type_id(d, member->type);
+                        if (r < 0)
+                                return r;
+                        member->type = r;
+                        member++;
+                }
+                break;
+        }
+
+        case BTF_KIND_FUNC_PROTO: {
+                struct btf_param *param = (struct btf_param *)(t + 1);
+                __u16 vlen = BTF_INFO_VLEN(t->info);
+
+                r = btf_dedup_remap_type_id(d, t->type);
+                if (r < 0)
+                        return r;
+                t->type = r;
+
+                for (i = 0; i < vlen; i++) {
+                        r = btf_dedup_remap_type_id(d, param->type);
+                        if (r < 0)
+                                return r;
+                        param->type = r;
+                        param++;
+                }
+                break;
+        }
+
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int btf_dedup_remap_types(struct btf_dedup *d)
+{
+        int i, r;
+
+        for (i = 1; i <= d->btf->nr_types; i++) {
+                r = btf_dedup_remap_type(d, i);
+                if (r < 0)
+                        return r;
+        }
+        return 0;
+}
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index b0610dcdae6b..b393da90cc85 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -55,33 +55,44 @@ struct btf_ext_header {
         __u32   line_info_len;
 };
 
-typedef int (*btf_print_fn_t)(const char *, ...)
-        __attribute__((format(printf, 1, 2)));
-
 LIBBPF_API void btf__free(struct btf *btf);
-LIBBPF_API struct btf *btf__new(__u8 *data, __u32 size, btf_print_fn_t err_log);
+LIBBPF_API struct btf *btf__new(__u8 *data, __u32 size);
 LIBBPF_API __s32 btf__find_by_name(const struct btf *btf,
                                    const char *type_name);
+LIBBPF_API __u32 btf__get_nr_types(const struct btf *btf);
 LIBBPF_API const struct btf_type *btf__type_by_id(const struct btf *btf,
                                                   __u32 id);
 LIBBPF_API __s64 btf__resolve_size(const struct btf *btf, __u32 type_id);
 LIBBPF_API int btf__resolve_type(const struct btf *btf, __u32 type_id);
 LIBBPF_API int btf__fd(const struct btf *btf);
+LIBBPF_API void btf__get_strings(const struct btf *btf, const char **strings,
+                                 __u32 *str_len);
 LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32 offset);
 LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
+LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
+                                    __u32 expected_key_size,
+                                    __u32 expected_value_size,
+                                    __u32 *key_type_id, __u32 *value_type_id);
+
+LIBBPF_API struct btf_ext *btf_ext__new(__u8 *data, __u32 size);
+LIBBPF_API void btf_ext__free(struct btf_ext *btf_ext);
+LIBBPF_API int btf_ext__reloc_func_info(const struct btf *btf,
+                                        const struct btf_ext *btf_ext,
+                                        const char *sec_name, __u32 insns_cnt,
+                                        void **func_info, __u32 *cnt);
+LIBBPF_API int btf_ext__reloc_line_info(const struct btf *btf,
+                                        const struct btf_ext *btf_ext,
+                                        const char *sec_name, __u32 insns_cnt,
+                                        void **line_info, __u32 *cnt);
+LIBBPF_API __u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext);
+LIBBPF_API __u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext);
+
+struct btf_dedup_opts {
+        bool dont_resolve_fwds;
+};
 
-struct btf_ext *btf_ext__new(__u8 *data, __u32 size, btf_print_fn_t err_log);
-void btf_ext__free(struct btf_ext *btf_ext);
-int btf_ext__reloc_func_info(const struct btf *btf,
-                             const struct btf_ext *btf_ext,
-                             const char *sec_name, __u32 insns_cnt,
-                             void **func_info, __u32 *func_info_len);
-int btf_ext__reloc_line_info(const struct btf *btf,
-                             const struct btf_ext *btf_ext,
-                             const char *sec_name, __u32 insns_cnt,
-                             void **line_info, __u32 *cnt);
-__u32 btf_ext__func_info_rec_size(const struct btf_ext *btf_ext);
-__u32 btf_ext__line_info_rec_size(const struct btf_ext *btf_ext);
+LIBBPF_API int btf__dedup(struct btf *btf, struct btf_ext *btf_ext,
+                          const struct btf_dedup_opts *opts);
 
 #ifdef __cplusplus
 } /* extern "C" */
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 03bc01ca2577..47969aa0faf8 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -42,6 +42,7 @@
 #include "bpf.h"
 #include "btf.h"
 #include "str_error.h"
+#include "libbpf_util.h"
 
 #ifndef EM_BPF
 #define EM_BPF 247
@@ -53,39 +54,33 @@
 
 #define __printf(a, b)  __attribute__((format(printf, a, b)))
 
-__printf(1, 2)
-static int __base_pr(const char *format, ...)
+static int __base_pr(enum libbpf_print_level level, const char *format,
+                     va_list args)
 {
-        va_list args;
-        int err;
+        if (level == LIBBPF_DEBUG)
+                return 0;
 
-        va_start(args, format);
-        err = vfprintf(stderr, format, args);
-        va_end(args);
-        return err;
+        return vfprintf(stderr, format, args);
 }
 
-static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr;
-static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr;
-static __printf(1, 2) libbpf_print_fn_t __pr_debug;
-
-#define __pr(func, fmt, ...)    \
-do {                            \
-        if ((func))             \
-                (func)("libbpf: " fmt, ##__VA_ARGS__); \
-} while (0)
+static libbpf_print_fn_t __libbpf_pr = __base_pr;
 
-#define pr_warning(fmt, ...)    __pr(__pr_warning, fmt, ##__VA_ARGS__)
-#define pr_info(fmt, ...)       __pr(__pr_info, fmt, ##__VA_ARGS__)
-#define pr_debug(fmt, ...)      __pr(__pr_debug, fmt, ##__VA_ARGS__)
+void libbpf_set_print(libbpf_print_fn_t fn)
+{
+        __libbpf_pr = fn;
+}
 
-void libbpf_set_print(libbpf_print_fn_t warn,
-                      libbpf_print_fn_t info,
-                      libbpf_print_fn_t debug)
+__printf(2, 3)
+void libbpf_print(enum libbpf_print_level level, const char *format, ...)
 {
-        __pr_warning = warn;
-        __pr_info = info;
-        __pr_debug = debug;
+        va_list args;
+
+        if (!__libbpf_pr)
+                return;
+
+        va_start(args, format);
+        __libbpf_pr(level, format, args);
+        va_end(args);
 }
 
 #define STRERR_BUFSIZE  128
@@ -839,8 +834,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
                 else if (strcmp(name, "maps") == 0)
                         obj->efile.maps_shndx = idx;
                 else if (strcmp(name, BTF_ELF_SEC) == 0) {
-                        obj->btf = btf__new(data->d_buf, data->d_size,
-                                            __pr_debug);
+                        obj->btf = btf__new(data->d_buf, data->d_size);
                         if (IS_ERR(obj->btf)) {
                                 pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
                                            BTF_ELF_SEC, PTR_ERR(obj->btf));
@@ -915,8 +909,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
                                  BTF_EXT_ELF_SEC, BTF_ELF_SEC);
                 } else {
                         obj->btf_ext = btf_ext__new(btf_ext_data->d_buf,
-                                                    btf_ext_data->d_size,
-                                                    __pr_debug);
+                                                    btf_ext_data->d_size);
                         if (IS_ERR(obj->btf_ext)) {
                                 pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
                                            BTF_EXT_ELF_SEC,
@@ -1057,72 +1050,18 @@ bpf_program__collect_reloc(struct bpf_program *prog, GElf_Shdr *shdr,
 
 static int bpf_map_find_btf_info(struct bpf_map *map, const struct btf *btf)
 {
-        const struct btf_type *container_type;
-        const struct btf_member *key, *value;
         struct bpf_map_def *def = &map->def;
-        const size_t max_name = 256;
-        char container_name[max_name];
-        __s64 key_size, value_size;
-        __s32 container_id;
-
-        if (snprintf(container_name, max_name, "____btf_map_%s", map->name) ==
-            max_name) {
-                pr_warning("map:%s length of '____btf_map_%s' is too long\n",
-                           map->name, map->name);
-                return -EINVAL;
-        }
-
-        container_id = btf__find_by_name(btf, container_name);
-        if (container_id < 0) {
-                pr_debug("map:%s container_name:%s cannot be found in BTF. Missing BPF_ANNOTATE_KV_PAIR?\n",
-                         map->name, container_name);
-                return container_id;
-        }
-
-        container_type = btf__type_by_id(btf, container_id);
-        if (!container_type) {
-                pr_warning("map:%s cannot find BTF type for container_id:%u\n",
-                           map->name, container_id);
-                return -EINVAL;
-        }
-
-        if (BTF_INFO_KIND(container_type->info) != BTF_KIND_STRUCT ||
-            BTF_INFO_VLEN(container_type->info) < 2) {
-                pr_warning("map:%s container_name:%s is an invalid container struct\n",
-                           map->name, container_name);
-                return -EINVAL;
-        }
-
-        key = (struct btf_member *)(container_type + 1);
-        value = key + 1;
-
-        key_size = btf__resolve_size(btf, key->type);
-        if (key_size < 0) {
-                pr_warning("map:%s invalid BTF key_type_size\n",
-                           map->name);
-                return key_size;
-        }
-
-        if (def->key_size != key_size) {
-                pr_warning("map:%s btf_key_type_size:%u != map_def_key_size:%u\n",
-                           map->name, (__u32)key_size, def->key_size);
-                return -EINVAL;
-        }
-
-        value_size = btf__resolve_size(btf, value->type);
-        if (value_size < 0) {
-                pr_warning("map:%s invalid BTF value_type_size\n", map->name);
-                return value_size;
-        }
+        __u32 key_type_id, value_type_id;
+        int ret;
 
-        if (def->value_size != value_size) {
-                pr_warning("map:%s btf_value_type_size:%u != map_def_value_size:%u\n",
-                           map->name, (__u32)value_size, def->value_size);
-                return -EINVAL;
-        }
+        ret = btf__get_map_kv_tids(btf, map->name, def->key_size,
+                                   def->value_size, &key_type_id,
+                                   &value_type_id);
+        if (ret)
+                return ret;
 
-        map->btf_key_type_id = key->type;
-        map->btf_value_type_id = value->type;
+        map->btf_key_type_id = key_type_id;
+        map->btf_value_type_id = value_type_id;
 
         return 0;
 }
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 43c77e98df6f..69a7c25eaccc 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -47,17 +47,16 @@ enum libbpf_errno {
 
 LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size);
 
-/*
- * __printf is defined in include/linux/compiler-gcc.h. However,
- * it would be better if libbpf.h didn't depend on Linux header files.
- * So instead of __printf, here we use gcc attribute directly.
- */
-typedef int (*libbpf_print_fn_t)(const char *, ...)
-        __attribute__((format(printf, 1, 2)));
+enum libbpf_print_level {
+        LIBBPF_WARN,
+        LIBBPF_INFO,
+        LIBBPF_DEBUG,
+};
+
+typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level,
+                                 const char *, va_list ap);
 
-LIBBPF_API void libbpf_set_print(libbpf_print_fn_t warn,
-                                 libbpf_print_fn_t info,
-                                 libbpf_print_fn_t debug);
+LIBBPF_API void libbpf_set_print(libbpf_print_fn_t fn);
 
 /* Hide internal to user */
 struct bpf_object;
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 62c680fb13d1..89c1149e32ee 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -133,4 +133,14 @@ LIBBPF_0.0.2 {
                 bpf_map_lookup_elem_flags;
                 bpf_object__find_map_fd_by_name;
                 bpf_get_link_xdp_id;
+                btf__dedup;
+                btf__get_map_kv_tids;
+                btf__get_nr_types;
+                btf__get_strings;
+                btf_ext__free;
+                btf_ext__func_info_rec_size;
+                btf_ext__line_info_rec_size;
+                btf_ext__new;
+                btf_ext__reloc_func_info;
+                btf_ext__reloc_line_info;
 } LIBBPF_0.0.1;
diff --git a/tools/lib/bpf/libbpf_util.h b/tools/lib/bpf/libbpf_util.h
new file mode 100644
index 000000000000..81ecda0cb9c9
--- /dev/null
+++ b/tools/lib/bpf/libbpf_util.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* Copyright (c) 2019 Facebook */
+
+#ifndef __LIBBPF_LIBBPF_UTIL_H
+#define __LIBBPF_LIBBPF_UTIL_H
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void libbpf_print(enum libbpf_print_level level,
+                         const char *format, ...)
+        __attribute__((format(printf, 2, 3)));
+
+#define __pr(level, fmt, ...)   \
+do {                            \
+        libbpf_print(level, "libbpf: " fmt, ##__VA_ARGS__);     \
+} while (0)
+
+#define pr_warning(fmt, ...)    __pr(LIBBPF_WARN, fmt, ##__VA_ARGS__)
+#define pr_info(fmt, ...)       __pr(LIBBPF_INFO, fmt, ##__VA_ARGS__)
+#define pr_debug(fmt, ...)      __pr(LIBBPF_DEBUG, fmt, ##__VA_ARGS__)
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif
diff --git a/tools/lib/bpf/test_libbpf.cpp b/tools/lib/bpf/test_libbpf.cpp
index abf3fc25c9fa..fc134873bb6d 100644
--- a/tools/lib/bpf/test_libbpf.cpp
+++ b/tools/lib/bpf/test_libbpf.cpp
@@ -8,11 +8,11 @@
 int main(int argc, char *argv[])
 {
     /* libbpf.h */
-    libbpf_set_print(NULL, NULL, NULL);
+    libbpf_set_print(NULL);
 
     /* bpf.h */
     bpf_prog_get_fd_by_id(0);
 
     /* btf.h */
-    btf__new(NULL, 0, NULL);
+    btf__new(NULL, 0);
 }
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 2f3eb6d293ee..037d8ff6a634 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -24,22 +24,12 @@
 #include "llvm-utils.h"
 #include "c++/clang-c.h"
 
-#define DEFINE_PRINT_FN(name, level) \
-static int libbpf_##name(const char *fmt, ...)  \
-{                                               \
-        va_list args;                           \
-        int ret;                                \
-                                                \
-        va_start(args, fmt);                    \
-        ret = veprintf(level, verbose, pr_fmt(fmt), args);\
-        va_end(args);                           \
-        return ret;                             \
+static int libbpf_perf_print(enum libbpf_print_level level __attribute__((unused)),
+                              const char *fmt, va_list args)
+{
+        return veprintf(1, verbose, pr_fmt(fmt), args);
 }
 
-DEFINE_PRINT_FN(warning, 1)
-DEFINE_PRINT_FN(info, 1)
-DEFINE_PRINT_FN(debug, 1)
-
 struct bpf_prog_priv {
         bool is_tp;
         char *sys_name;
@@ -59,9 +49,7 @@ bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
         struct bpf_object *obj;
 
         if (!libbpf_initialized) {
-                libbpf_set_print(libbpf_warning,
-                                 libbpf_info,
-                                 libbpf_debug);
+                libbpf_set_print(libbpf_perf_print);
                 libbpf_initialized = true;
         }
 
@@ -79,9 +67,7 @@ struct bpf_object *bpf__prepare_load(const char *filename, bool source)
         struct bpf_object *obj;
 
         if (!libbpf_initialized) {
-                libbpf_set_print(libbpf_warning,
-                                 libbpf_info,
-                                 libbpf_debug);
+                libbpf_set_print(libbpf_perf_print);
                 libbpf_initialized = true;
         }
 
diff --git a/tools/testing/selftests/bpf/tcp_client.py b/tools/testing/selftests/bpf/tcp_client.py
index 7f8200a8702b..a53ed58528d6 100755
--- a/tools/testing/selftests/bpf/tcp_client.py
+++ b/tools/testing/selftests/bpf/tcp_client.py
@@ -30,12 +30,11 @@ def send(sock, s):
 
 
 serverPort = int(sys.argv[1])
-HostName = socket.gethostname()
 
 # create active socket
 sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
 try:
-    sock.connect((HostName, serverPort))
+    sock.connect(('localhost', serverPort))
 except socket.error as e:
     sys.exit(1)
 
diff --git a/tools/testing/selftests/bpf/tcp_server.py b/tools/testing/selftests/bpf/tcp_server.py
index b39903fca4c8..0ca60d193bed 100755
--- a/tools/testing/selftests/bpf/tcp_server.py
+++ b/tools/testing/selftests/bpf/tcp_server.py
@@ -35,13 +35,10 @@ MAX_PORTS = 2
 serverPort = SERVER_PORT
 serverSocket = None
 
-HostName = socket.gethostname()
-
 # create passive socket
 serverSocket = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
-host = socket.gethostname()
 
-try: serverSocket.bind((host, 0))
+try: serverSocket.bind(('localhost', 0))
 except socket.error as msg:
     print('bind fails: ' + str(msg))
 
diff --git a/tools/testing/selftests/bpf/test_btf.c b/tools/testing/selftests/bpf/test_btf.c
index 179f1d8ec5bf..447acc34db94 100644
--- a/tools/testing/selftests/bpf/test_btf.c
+++ b/tools/testing/selftests/bpf/test_btf.c
@@ -52,18 +52,10 @@ static int count_result(int err)
         return err;
 }
 
-#define __printf(a, b)  __attribute__((format(printf, a, b)))
-
-__printf(1, 2)
-static int __base_pr(const char *format, ...)
+static int __base_pr(enum libbpf_print_level level __attribute__((unused)),
+                     const char *format, va_list args)
 {
-        va_list args;
-        int err;
-
-        va_start(args, format);
-        err = vfprintf(stderr, format, args);
-        va_end(args);
-        return err;
+        return vfprintf(stderr, format, args);
 }
 
 #define BTF_INFO_ENC(kind, kind_flag, vlen)                     \
@@ -78,12 +70,21 @@ static int __base_pr(const char *format, ...)
         BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz),       \
         BTF_INT_ENC(encoding, bits_offset, bits)
 
+#define BTF_FWD_ENC(name, kind_flag) \
+        BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FWD, kind_flag, 0), 0)
+
 #define BTF_ARRAY_ENC(type, index_type, nr_elems)       \
         (type), (index_type), (nr_elems)
 #define BTF_TYPE_ARRAY_ENC(type, index_type, nr_elems) \
         BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_ARRAY, 0, 0), 0), \
         BTF_ARRAY_ENC(type, index_type, nr_elems)
 
+#define BTF_STRUCT_ENC(name, nr_elems, sz)      \
+        BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, nr_elems), sz)
+
+#define BTF_UNION_ENC(name, nr_elems, sz)       \
+        BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_UNION, 0, nr_elems), sz)
+
 #define BTF_MEMBER_ENC(name, type, bits_offset) \
         (name), (type), (bits_offset)
 #define BTF_ENUM_ENC(name, val) (name), (val)
@@ -99,6 +100,12 @@ static int __base_pr(const char *format, ...)
 #define BTF_CONST_ENC(type) \
         BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_CONST, 0, 0), type)
 
+#define BTF_VOLATILE_ENC(type) \
+        BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_VOLATILE, 0, 0), type)
+
+#define BTF_RESTRICT_ENC(type) \
+        BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_RESTRICT, 0, 0), type)
+
 #define BTF_FUNC_PROTO_ENC(ret_type, nargs) \
         BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_FUNC_PROTO, 0, nargs), ret_type)
 
@@ -111,6 +118,10 @@ static int __base_pr(const char *format, ...)
 #define BTF_END_RAW 0xdeadbeef
 #define NAME_TBD 0xdeadb33f
 
+#define NAME_NTH(N) (0xffff0000 | N)
+#define IS_NAME_NTH(X) ((X & 0xffff0000) == 0xffff0000)
+#define GET_NAME_NTH_IDX(X) (X & 0x0000ffff)
+
 #define MAX_NR_RAW_U32 1024
 #define BTF_LOG_BUF_SIZE 65535
 
@@ -119,12 +130,14 @@ static struct args {
         unsigned int file_test_num;
         unsigned int get_info_test_num;
         unsigned int info_raw_test_num;
+        unsigned int dedup_test_num;
         bool raw_test;
         bool file_test;
         bool get_info_test;
         bool pprint_test;
         bool always_log;
         bool info_raw_test;
+        bool dedup_test;
 } args;
 
 static char btf_log_buf[BTF_LOG_BUF_SIZE];
@@ -1965,7 +1978,7 @@ static struct btf_raw_test raw_tests[] = {
                 /* void (*)(int a, unsigned int <bad_name_off>) */
                 BTF_FUNC_PROTO_ENC(0, 2),                       /* [3] */
                         BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
-                        BTF_FUNC_PROTO_ARG_ENC(0xffffffff, 2),
+                        BTF_FUNC_PROTO_ARG_ENC(0x0fffffff, 2),
                 BTF_END_RAW,
         },
         .str_sec = "\0a",
@@ -2835,11 +2848,13 @@ static void *btf_raw_create(const struct btf_header *hdr,
                             const char **ret_next_str)
 {
         const char *next_str = str, *end_str = str + str_sec_size;
+        const char **strs_idx = NULL, **tmp_strs_idx;
+        int strs_cap = 0, strs_cnt = 0, next_str_idx = 0;
         unsigned int size_needed, offset;
         struct btf_header *ret_hdr;
-        int i, type_sec_size;
+        int i, type_sec_size, err = 0;
         uint32_t *ret_types;
-        void *raw_btf;
+        void *raw_btf = NULL;
 
         type_sec_size = get_raw_sec_size(raw_types);
         if (CHECK(type_sec_size < 0, "Cannot get nr_raw_types"))
@@ -2854,17 +2869,44 @@ static void *btf_raw_create(const struct btf_header *hdr,
         memcpy(raw_btf, hdr, sizeof(*hdr));
         offset = sizeof(*hdr);
 
+        /* Index strings */
+        while ((next_str = get_next_str(next_str, end_str))) {
+                if (strs_cnt == strs_cap) {
+                        strs_cap += max(16, strs_cap / 2);
+                        tmp_strs_idx = realloc(strs_idx,
+                                               sizeof(*strs_idx) * strs_cap);
+                        if (CHECK(!tmp_strs_idx,
+                                  "Cannot allocate memory for strs_idx")) {
+                                err = -1;
+                                goto done;
+                        }
+                        strs_idx = tmp_strs_idx;
+                }
+                strs_idx[strs_cnt++] = next_str;
+                next_str += strlen(next_str);
+        }
+
         /* Copy type section */
         ret_types = raw_btf + offset;
         for (i = 0; i < type_sec_size / sizeof(raw_types[0]); i++) {
                 if (raw_types[i] == NAME_TBD) {
-                        next_str = get_next_str(next_str, end_str);
-                        if (CHECK(!next_str, "Error in getting next_str")) {
-                                free(raw_btf);
-                                return NULL;
+                        if (CHECK(next_str_idx == strs_cnt,
+                                  "Error in getting next_str #%d",
+                                  next_str_idx)) {
+                                err = -1;
+                                goto done;
                         }
-                        ret_types[i] = next_str - str;
-                        next_str += strlen(next_str);
+                        ret_types[i] = strs_idx[next_str_idx++] - str;
+                } else if (IS_NAME_NTH(raw_types[i])) {
+                        int idx = GET_NAME_NTH_IDX(raw_types[i]);
+
+                        if (CHECK(idx <= 0 || idx > strs_cnt,
+                                  "Error getting string #%d, strs_cnt:%d",
+                                  idx, strs_cnt)) {
+                                err = -1;
+                                goto done;
+                        }
+                        ret_types[i] = strs_idx[idx-1] - str;
                 } else {
                         ret_types[i] = raw_types[i];
                 }
@@ -2881,8 +2923,17 @@ static void *btf_raw_create(const struct btf_header *hdr,
 
         *btf_size = size_needed;
         if (ret_next_str)
-                *ret_next_str = next_str;
+                *ret_next_str =
+                        next_str_idx < strs_cnt ? strs_idx[next_str_idx] : NULL;
 
+done:
+        if (err) {
+                if (raw_btf)
+                        free(raw_btf);
+                if (strs_idx)
+                        free(strs_idx);
+                return NULL;
+        }
         return raw_btf;
 }
 
@@ -5551,20 +5602,450 @@ static int test_info_raw(void)
         return err;
 }
 
+struct btf_raw_data {
+        __u32 raw_types[MAX_NR_RAW_U32];
+        const char *str_sec;
+        __u32 str_sec_size;
+};
+
+struct btf_dedup_test {
+        const char *descr;
+        struct btf_raw_data input;
+        struct btf_raw_data expect;
+        struct btf_dedup_opts opts;
+};
+
+const struct btf_dedup_test dedup_tests[] = {
+
+{
+        .descr = "dedup: unused strings filtering",
+        .input = {
+                .raw_types = {
+                        BTF_TYPE_INT_ENC(NAME_NTH(2), BTF_INT_SIGNED, 0, 32, 4),
+                        BTF_TYPE_INT_ENC(NAME_NTH(5), BTF_INT_SIGNED, 0, 64, 8),
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0unused\0int\0foo\0bar\0long"),
+        },
+        .expect = {
+                .raw_types = {
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4),
+                        BTF_TYPE_INT_ENC(NAME_NTH(2), BTF_INT_SIGNED, 0, 64, 8),
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0int\0long"),
+        },
+        .opts = {
+                .dont_resolve_fwds = false,
+        },
+},
+{
+        .descr = "dedup: strings deduplication",
+        .input = {
+                .raw_types = {
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4),
+                        BTF_TYPE_INT_ENC(NAME_NTH(2), BTF_INT_SIGNED, 0, 64, 8),
+                        BTF_TYPE_INT_ENC(NAME_NTH(3), BTF_INT_SIGNED, 0, 32, 4),
+                        BTF_TYPE_INT_ENC(NAME_NTH(4), BTF_INT_SIGNED, 0, 64, 8),
+                        BTF_TYPE_INT_ENC(NAME_NTH(5), BTF_INT_SIGNED, 0, 32, 4),
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0int\0long int\0int\0long int\0int"),
+        },
+        .expect = {
+                .raw_types = {
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4),
+                        BTF_TYPE_INT_ENC(NAME_NTH(2), BTF_INT_SIGNED, 0, 64, 8),
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0int\0long int"),
+        },
+        .opts = {
+                .dont_resolve_fwds = false,
+        },
+},
+{
+        .descr = "dedup: struct example #1",
+        /*
+         * struct s {
+         *      struct s *next;
+         *      const int *a;
+         *      int b[16];
+         *      int c;
+         * }
+         */
+        .input = {
+                .raw_types = {
+                        /* int */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4),        /* [1] */
+                        /* int[16] */
+                        BTF_TYPE_ARRAY_ENC(1, 1, 16),                                   /* [2] */
+                        /* struct s { */
+                        BTF_STRUCT_ENC(NAME_NTH(2), 4, 84),                             /* [3] */
+                                BTF_MEMBER_ENC(NAME_NTH(3), 4, 0),      /* struct s *next;      */
+                                BTF_MEMBER_ENC(NAME_NTH(4), 5, 64),     /* const int *a;        */
+                                BTF_MEMBER_ENC(NAME_NTH(5), 2, 128),    /* int b[16];           */
+                                BTF_MEMBER_ENC(NAME_NTH(6), 1, 640),    /* int c;               */
+                        /* ptr -> [3] struct s */
+                        BTF_PTR_ENC(3),                                                 /* [4] */
+                        /* ptr -> [6] const int */
+                        BTF_PTR_ENC(6),                                                 /* [5] */
+                        /* const -> [1] int */
+                        BTF_CONST_ENC(1),                                               /* [6] */
+
+                        /* full copy of the above */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4),        /* [7] */
+                        BTF_TYPE_ARRAY_ENC(7, 7, 16),                                   /* [8] */
+                        BTF_STRUCT_ENC(NAME_NTH(2), 4, 84),                             /* [9] */
+                                BTF_MEMBER_ENC(NAME_NTH(3), 10, 0),
+                                BTF_MEMBER_ENC(NAME_NTH(4), 11, 64),
+                                BTF_MEMBER_ENC(NAME_NTH(5), 8, 128),
+                                BTF_MEMBER_ENC(NAME_NTH(6), 7, 640),
+                        BTF_PTR_ENC(9),                                                 /* [10] */
+                        BTF_PTR_ENC(12),                                                /* [11] */
+                        BTF_CONST_ENC(7),                                               /* [12] */
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0int\0s\0next\0a\0b\0c\0"),
+        },
+        .expect = {
+                .raw_types = {
+                        /* int */
+                        BTF_TYPE_INT_ENC(NAME_NTH(4), BTF_INT_SIGNED, 0, 32, 4),        /* [1] */
+                        /* int[16] */
+                        BTF_TYPE_ARRAY_ENC(1, 1, 16),                                   /* [2] */
+                        /* struct s { */
+                        BTF_STRUCT_ENC(NAME_NTH(6), 4, 84),                             /* [3] */
+                                BTF_MEMBER_ENC(NAME_NTH(5), 4, 0),      /* struct s *next;      */
+                                BTF_MEMBER_ENC(NAME_NTH(1), 5, 64),     /* const int *a;        */
+                                BTF_MEMBER_ENC(NAME_NTH(2), 2, 128),    /* int b[16];           */
+                                BTF_MEMBER_ENC(NAME_NTH(3), 1, 640),    /* int c;               */
+                        /* ptr -> [3] struct s */
+                        BTF_PTR_ENC(3),                                                 /* [4] */
+                        /* ptr -> [6] const int */
+                        BTF_PTR_ENC(6),                                                 /* [5] */
+                        /* const -> [1] int */
+                        BTF_CONST_ENC(1),                                               /* [6] */
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0a\0b\0c\0int\0next\0s"),
+        },
+        .opts = {
+                .dont_resolve_fwds = false,
+        },
+},
+{
+        .descr = "dedup: all possible kinds (no duplicates)",
+        .input = {
+                .raw_types = {
+                        BTF_TYPE_INT_ENC(NAME_TBD, BTF_INT_SIGNED, 0, 32, 8),           /* [1] int */
+                        BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_ENUM, 0, 2), 4),   /* [2] enum */
+                                BTF_ENUM_ENC(NAME_TBD, 0),
+                                BTF_ENUM_ENC(NAME_TBD, 1),
+                        BTF_FWD_ENC(NAME_TBD, 1 /* union kind_flag */),                 /* [3] fwd */
+                        BTF_TYPE_ARRAY_ENC(2, 1, 7),                                    /* [4] array */
+                        BTF_STRUCT_ENC(NAME_TBD, 1, 4),                                 /* [5] struct */
+                                BTF_MEMBER_ENC(NAME_TBD, 1, 0),
+                        BTF_UNION_ENC(NAME_TBD, 1, 4),                                  /* [6] union */
+                                BTF_MEMBER_ENC(NAME_TBD, 1, 0),
+                        BTF_TYPEDEF_ENC(NAME_TBD, 1),                                   /* [7] typedef */
+                        BTF_PTR_ENC(0),                                                 /* [8] ptr */
+                        BTF_CONST_ENC(8),                                               /* [9] const */
+                        BTF_VOLATILE_ENC(8),                                            /* [10] volatile */
+                        BTF_RESTRICT_ENC(8),                                            /* [11] restrict */
+                        BTF_FUNC_PROTO_ENC(1, 2),                                       /* [12] func_proto */
+                                BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+                                BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 8),
+                        BTF_FUNC_ENC(NAME_TBD, 12),                                     /* [13] func */
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0A\0B\0C\0D\0E\0F\0G\0H\0I\0J\0K\0L\0M"),
+        },
+        .expect = {
+                .raw_types = {
+                        BTF_TYPE_INT_ENC(NAME_TBD, BTF_INT_SIGNED, 0, 32, 8),           /* [1] int */
+                        BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_ENUM, 0, 2), 4),   /* [2] enum */
+                                BTF_ENUM_ENC(NAME_TBD, 0),
+                                BTF_ENUM_ENC(NAME_TBD, 1),
+                        BTF_FWD_ENC(NAME_TBD, 1 /* union kind_flag */),                 /* [3] fwd */
+                        BTF_TYPE_ARRAY_ENC(2, 1, 7),                                    /* [4] array */
+                        BTF_STRUCT_ENC(NAME_TBD, 1, 4),                                 /* [5] struct */
+                                BTF_MEMBER_ENC(NAME_TBD, 1, 0),
+                        BTF_UNION_ENC(NAME_TBD, 1, 4),                                  /* [6] union */
+                                BTF_MEMBER_ENC(NAME_TBD, 1, 0),
+                        BTF_TYPEDEF_ENC(NAME_TBD, 1),                                   /* [7] typedef */
+                        BTF_PTR_ENC(0),                                                 /* [8] ptr */
+                        BTF_CONST_ENC(8),                                               /* [9] const */
+                        BTF_VOLATILE_ENC(8),                                            /* [10] volatile */
+                        BTF_RESTRICT_ENC(8),                                            /* [11] restrict */
+                        BTF_FUNC_PROTO_ENC(1, 2),                                       /* [12] func_proto */
+                                BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+                                BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 8),
+                        BTF_FUNC_ENC(NAME_TBD, 12),                                     /* [13] func */
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0A\0B\0C\0D\0E\0F\0G\0H\0I\0J\0K\0L\0M"),
+        },
+        .opts = {
+                .dont_resolve_fwds = false,
+        },
+},
+{
+        .descr = "dedup: no int duplicates",
+        .input = {
+                .raw_types = {
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 8),
+                        /* different name */
+                        BTF_TYPE_INT_ENC(NAME_NTH(2), BTF_INT_SIGNED, 0, 32, 8),
+                        /* different encoding */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_CHAR, 0, 32, 8),
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_BOOL, 0, 32, 8),
+                        /* different bit offset */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 8, 32, 8),
+                        /* different bit size */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 27, 8),
+                        /* different byte size */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4),
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0int\0some other int"),
+        },
+        .expect = {
+                .raw_types = {
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 8),
+                        /* different name */
+                        BTF_TYPE_INT_ENC(NAME_NTH(2), BTF_INT_SIGNED, 0, 32, 8),
+                        /* different encoding */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_CHAR, 0, 32, 8),
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_BOOL, 0, 32, 8),
+                        /* different bit offset */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 8, 32, 8),
+                        /* different bit size */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 27, 8),
+                        /* different byte size */
+                        BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4),
+                        BTF_END_RAW,
+                },
+                BTF_STR_SEC("\0int\0some other int"),
+        },
+        .opts = {
+                .dont_resolve_fwds = false,
+        },
+},
+
+};
+
+static int btf_type_size(const struct btf_type *t)
+{
+        int base_size = sizeof(struct btf_type);
+        __u16 vlen = BTF_INFO_VLEN(t->info);
+        __u16 kind = BTF_INFO_KIND(t->info);
+
+        switch (kind) {
+        case BTF_KIND_FWD:
+        case BTF_KIND_CONST:
+        case BTF_KIND_VOLATILE:
+        case BTF_KIND_RESTRICT:
+        case BTF_KIND_PTR:
+        case BTF_KIND_TYPEDEF:
+        case BTF_KIND_FUNC:
+                return base_size;
+        case BTF_KIND_INT:
+                return base_size + sizeof(__u32);
+        case BTF_KIND_ENUM:
+                return base_size + vlen * sizeof(struct btf_enum);
+        case BTF_KIND_ARRAY:
+                return base_size + sizeof(struct btf_array);
+        case BTF_KIND_STRUCT:
+        case BTF_KIND_UNION:
+                return base_size + vlen * sizeof(struct btf_member);
+        case BTF_KIND_FUNC_PROTO:
+                return base_size + vlen * sizeof(struct btf_param);
+        default:
+                fprintf(stderr, "Unsupported BTF_KIND:%u\n", kind);
+                return -EINVAL;
+        }
+}
+
+static void dump_btf_strings(const char *strs, __u32 len)
+{
+        const char *cur = strs;
+        int i = 0;
+
+        while (cur < strs + len) {
+                fprintf(stderr, "string #%d: '%s'\n", i, cur);
+                cur += strlen(cur) + 1;
+                i++;
+        }
+}
+
+static int do_test_dedup(unsigned int test_num)
+{
+        const struct btf_dedup_test *test = &dedup_tests[test_num - 1];
+        int err = 0, i;
+        __u32 test_nr_types, expect_nr_types, test_str_len, expect_str_len;
+        void *raw_btf;
+        unsigned int raw_btf_size;
+        struct btf *test_btf = NULL, *expect_btf = NULL;
+        const char *ret_test_next_str, *ret_expect_next_str;
+        const char *test_strs, *expect_strs;
+        const char *test_str_cur, *test_str_end;
+        const char *expect_str_cur, *expect_str_end;
+
+        fprintf(stderr, "BTF dedup test[%u] (%s):", test_num, test->descr);
+
+        raw_btf = btf_raw_create(&hdr_tmpl, test->input.raw_types,
+                                 test->input.str_sec, test->input.str_sec_size,
+                                 &raw_btf_size, &ret_test_next_str);
+        if (!raw_btf)
+                return -1;
+        test_btf = btf__new((__u8 *)raw_btf, raw_btf_size);
+        free(raw_btf);
+        if (CHECK(IS_ERR(test_btf), "invalid test_btf errno:%ld",
+                  PTR_ERR(test_btf))) {
+                err = -1;
+                goto done;
+        }
+
+        raw_btf = btf_raw_create(&hdr_tmpl, test->expect.raw_types,
+                                 test->expect.str_sec,
+                                 test->expect.str_sec_size,
+                                 &raw_btf_size, &ret_expect_next_str);
+        if (!raw_btf)
+                return -1;
+        expect_btf = btf__new((__u8 *)raw_btf, raw_btf_size);
+        free(raw_btf);
+        if (CHECK(IS_ERR(expect_btf), "invalid expect_btf errno:%ld",
+                  PTR_ERR(expect_btf))) {
+                err = -1;
+                goto done;
+        }
+
+        err = btf__dedup(test_btf, NULL, &test->opts);
+        if (CHECK(err, "btf_dedup failed errno:%d", err)) {
+                err = -1;
+                goto done;
+        }
+
+        btf__get_strings(test_btf, &test_strs, &test_str_len);
+        btf__get_strings(expect_btf, &expect_strs, &expect_str_len);
+        if (CHECK(test_str_len != expect_str_len,
+                  "test_str_len:%u != expect_str_len:%u",
+                  test_str_len, expect_str_len)) {
+                fprintf(stderr, "\ntest strings:\n");
+                dump_btf_strings(test_strs, test_str_len);
+                fprintf(stderr, "\nexpected strings:\n");
+                dump_btf_strings(expect_strs, expect_str_len);
+                err = -1;
+                goto done;
+        }
+
+        test_str_cur = test_strs;
+        test_str_end = test_strs + test_str_len;
+        expect_str_cur = expect_strs;
+        expect_str_end = expect_strs + expect_str_len;
+        while (test_str_cur < test_str_end && expect_str_cur < expect_str_end) {
+                size_t test_len, expect_len;
+
+                test_len = strlen(test_str_cur);
+                expect_len = strlen(expect_str_cur);
+                if (CHECK(test_len != expect_len,
+                          "test_len:%zu != expect_len:%zu "
+                          "(test_str:%s, expect_str:%s)",
+                          test_len, expect_len, test_str_cur, expect_str_cur)) {
+                        err = -1;
+                        goto done;
+                }
+                if (CHECK(strcmp(test_str_cur, expect_str_cur),
+                          "test_str:%s != expect_str:%s",
+                          test_str_cur, expect_str_cur)) {
+                        err = -1;
+                        goto done;
+                }
+                test_str_cur += test_len + 1;
+                expect_str_cur += expect_len + 1;
+        }
+        if (CHECK(test_str_cur != test_str_end,
+                  "test_str_cur:%p != test_str_end:%p",
+                  test_str_cur, test_str_end)) {
+                err = -1;
+                goto done;
+        }
+
+        test_nr_types = btf__get_nr_types(test_btf);
+        expect_nr_types = btf__get_nr_types(expect_btf);
+        if (CHECK(test_nr_types != expect_nr_types,
+                  "test_nr_types:%u != expect_nr_types:%u",
+                  test_nr_types, expect_nr_types)) {
+                err = -1;
+                goto done;
+        }
+
+        for (i = 1; i <= test_nr_types; i++) {
+                const struct btf_type *test_type, *expect_type;
+                int test_size, expect_size;
+
+                test_type = btf__type_by_id(test_btf, i);
+                expect_type = btf__type_by_id(expect_btf, i);
+                test_size = btf_type_size(test_type);
+                expect_size = btf_type_size(expect_type);
+
+                if (CHECK(test_size != expect_size,
+                          "type #%d: test_size:%d != expect_size:%u",
+                          i, test_size, expect_size)) {
+                        err = -1;
+                        goto done;
+                }
+                if (CHECK(memcmp((void *)test_type,
+                                 (void *)expect_type,
+                                 test_size),
+                          "type #%d: contents differ", i)) {
+                        err = -1;
+                        goto done;
+                }
+        }
+
+done:
+        if (!err)
+                fprintf(stderr, "OK");
+        if (!IS_ERR(test_btf))
+                btf__free(test_btf);
+        if (!IS_ERR(expect_btf))
+                btf__free(expect_btf);
+
+        return err;
+}
+
+static int test_dedup(void)
+{
+        unsigned int i;
+        int err = 0;
+
+        if (args.dedup_test_num)
+                return count_result(do_test_dedup(args.dedup_test_num));
+
+        for (i = 1; i <= ARRAY_SIZE(dedup_tests); i++)
+                err |= count_result(do_test_dedup(i));
+
+        return err;
+}
+
 static void usage(const char *cmd)
 {
         fprintf(stderr, "Usage: %s [-l] [[-r btf_raw_test_num (1 - %zu)] |\n"
                         "\t[-g btf_get_info_test_num (1 - %zu)] |\n"
                         "\t[-f btf_file_test_num (1 - %zu)] |\n"
                         "\t[-k btf_prog_info_raw_test_num (1 - %zu)] |\n"
-                        "\t[-p (pretty print test)]]\n",
+                        "\t[-p (pretty print test)] |\n"
+                        "\t[-d btf_dedup_test_num (1 - %zu)]]\n",
                 cmd, ARRAY_SIZE(raw_tests), ARRAY_SIZE(get_info_tests),
-                ARRAY_SIZE(file_tests), ARRAY_SIZE(info_raw_tests));
+                ARRAY_SIZE(file_tests), ARRAY_SIZE(info_raw_tests),
+                ARRAY_SIZE(dedup_tests));
 }
 
 static int parse_args(int argc, char **argv)
 {
-        const char *optstr = "lpk:f:r:g:";
+        const char *optstr = "hlpk:f:r:g:d:";
         int opt;
 
         while ((opt = getopt(argc, argv, optstr)) != -1) {
@@ -5591,12 +6072,16 @@ static int parse_args(int argc, char **argv)
                         args.info_raw_test_num = atoi(optarg);
                         args.info_raw_test = true;
                         break;
+                case 'd':
+                        args.dedup_test_num = atoi(optarg);
+                        args.dedup_test = true;
+                        break;
                 case 'h':
                         usage(argv[0]);
                         exit(0);
                 default:
-                                usage(argv[0]);
-                                return -1;
+                        usage(argv[0]);
+                        return -1;
                 }
         }
 
@@ -5632,6 +6117,14 @@ static int parse_args(int argc, char **argv)
                 return -1;
         }
 
+        if (args.dedup_test_num &&
+            (args.dedup_test_num < 1 ||
+             args.dedup_test_num > ARRAY_SIZE(dedup_tests))) {
+                fprintf(stderr, "BTF dedup test number must be [1 - %zu]\n",
+                        ARRAY_SIZE(dedup_tests));
+                return -1;
+        }
+
         return 0;
 }
 
@@ -5650,7 +6143,7 @@ int main(int argc, char **argv)
                 return err;
 
         if (args.always_log)
-                libbpf_set_print(__base_pr, __base_pr, __base_pr);
+                libbpf_set_print(__base_pr);
 
         if (args.raw_test)
                 err |= test_raw();
@@ -5667,14 +6160,18 @@ int main(int argc, char **argv)
         if (args.info_raw_test)
                 err |= test_info_raw();
 
+        if (args.dedup_test)
+                err |= test_dedup();
+
         if (args.raw_test || args.get_info_test || args.file_test ||
-            args.pprint_test || args.info_raw_test)
+            args.pprint_test || args.info_raw_test || args.dedup_test)
                 goto done;
 
         err |= test_raw();
         err |= test_get_info();
         err |= test_file();
         err |= test_info_raw();
+        err |= test_dedup();
 
 done:
         print_summary();
diff --git a/tools/testing/selftests/bpf/test_libbpf_open.c b/tools/testing/selftests/bpf/test_libbpf_open.c
index 8fcd1c076add..1909ecf4d999 100644
--- a/tools/testing/selftests/bpf/test_libbpf_open.c
+++ b/tools/testing/selftests/bpf/test_libbpf_open.c
@@ -34,23 +34,16 @@ static void usage(char *argv[])
         printf("\n");
 }
 
-#define DEFINE_PRINT_FN(name, enabled) \
-static int libbpf_##name(const char *fmt, ...)          \
-{                                                       \
-        va_list args;                                   \
-        int ret;                                        \
-                                                        \
-        va_start(args, fmt);                            \
-        if (enabled) {                                  \
-                fprintf(stderr, "[" #name "] ");        \
-                ret = vfprintf(stderr, fmt, args);      \
-        }                                               \
-        va_end(args);                                   \
-        return ret;                                     \
+static bool debug = 0;
+static int libbpf_debug_print(enum libbpf_print_level level,
+                              const char *fmt, va_list args)
+{
+        if (level == LIBBPF_DEBUG && !debug)
+                return 0;
+
+        fprintf(stderr, "[%d] ", level);
+        return vfprintf(stderr, fmt, args);
 }
-DEFINE_PRINT_FN(warning, 1)
-DEFINE_PRINT_FN(info, 1)
-DEFINE_PRINT_FN(debug, 1)
 
 #define EXIT_FAIL_LIBBPF EXIT_FAILURE
 #define EXIT_FAIL_OPTION 2
@@ -120,15 +113,14 @@ int main(int argc, char **argv)
         int longindex = 0;
         int opt;
 
-        libbpf_set_print(libbpf_warning, libbpf_info, NULL);
+        libbpf_set_print(libbpf_debug_print);
 
         /* Parse commands line args */
         while ((opt = getopt_long(argc, argv, "hDq",
                                   long_options, &longindex)) != -1) {
                 switch (opt) {
                 case 'D':
-                        libbpf_set_print(libbpf_warning, libbpf_info,
-                                         libbpf_debug);
+                        debug = 1;
                         break;
                 case 'q': /* Use in scripting mode */
                         verbose = 0;
diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index e7798dd97f4b..3c627771f965 100644
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -45,7 +45,7 @@ static int map_flags;
         }                                                               \
 })
 
-static void test_hashmap(int task, void *data)
+static void test_hashmap(unsigned int task, void *data)
 {
         long long key, next_key, first_key, value;
         int fd;
@@ -135,7 +135,7 @@ static void test_hashmap(int task, void *data)
         close(fd);
 }
 
-static void test_hashmap_sizes(int task, void *data)
+static void test_hashmap_sizes(unsigned int task, void *data)
 {
         int fd, i, j;
 
@@ -155,7 +155,7 @@ static void test_hashmap_sizes(int task, void *data)
                 }
 }
 
-static void test_hashmap_percpu(int task, void *data)
+static void test_hashmap_percpu(unsigned int task, void *data)
 {
         unsigned int nr_cpus = bpf_num_possible_cpus();
         BPF_DECLARE_PERCPU(long, value);
@@ -282,7 +282,7 @@ static int helper_fill_hashmap(int max_entries)
         return fd;
 }
 
-static void test_hashmap_walk(int task, void *data)
+static void test_hashmap_walk(unsigned int task, void *data)
 {
         int fd, i, max_entries = 1000;
         long long key, value, next_key;
@@ -353,7 +353,7 @@ static void test_hashmap_zero_seed(void)
         close(second);
 }
 
-static void test_arraymap(int task, void *data)
+static void test_arraymap(unsigned int task, void *data)
 {
         int key, next_key, fd;
         long long value;
@@ -408,7 +408,7 @@ static void test_arraymap(int task, void *data)
         close(fd);
 }
 
-static void test_arraymap_percpu(int task, void *data)
+static void test_arraymap_percpu(unsigned int task, void *data)
 {
         unsigned int nr_cpus = bpf_num_possible_cpus();
         BPF_DECLARE_PERCPU(long, values);
@@ -504,7 +504,7 @@ static void test_arraymap_percpu_many_keys(void)
         close(fd);
 }
 
-static void test_devmap(int task, void *data)
+static void test_devmap(unsigned int task, void *data)
 {
         int fd;
         __u32 key, value;
@@ -519,7 +519,7 @@ static void test_devmap(int task, void *data)
         close(fd);
 }
 
-static void test_queuemap(int task, void *data)
+static void test_queuemap(unsigned int task, void *data)
 {
         const int MAP_SIZE = 32;
         __u32 vals[MAP_SIZE + MAP_SIZE/2], val;
@@ -577,7 +577,7 @@ static void test_queuemap(int task, void *data)
         close(fd);
 }
 
-static void test_stackmap(int task, void *data)
+static void test_stackmap(unsigned int task, void *data)
 {
         const int MAP_SIZE = 32;
         __u32 vals[MAP_SIZE + MAP_SIZE/2], val;
@@ -642,7 +642,7 @@ static void test_stackmap(int task, void *data)
 #define SOCKMAP_PARSE_PROG "./sockmap_parse_prog.o"
 #define SOCKMAP_VERDICT_PROG "./sockmap_verdict_prog.o"
 #define SOCKMAP_TCP_MSG_PROG "./sockmap_tcp_msg_prog.o"
-static void test_sockmap(int tasks, void *data)
+static void test_sockmap(unsigned int tasks, void *data)
 {
         struct bpf_map *bpf_map_rx, *bpf_map_tx, *bpf_map_msg, *bpf_map_break;
         int map_fd_msg = 0, map_fd_rx = 0, map_fd_tx = 0, map_fd_break;
@@ -1268,10 +1268,11 @@ static void test_map_large(void)
 }
 
 #define run_parallel(N, FN, DATA) \
-        printf("Fork %d tasks to '" #FN "'\n", N); \
+        printf("Fork %u tasks to '" #FN "'\n", N); \
         __run_parallel(N, FN, DATA)
 
-static void __run_parallel(int tasks, void (*fn)(int task, void *data),
+static void __run_parallel(unsigned int tasks,
+                           void (*fn)(unsigned int task, void *data),
                            void *data)
 {
         pid_t pid[tasks];
@@ -1312,7 +1313,7 @@ static void test_map_stress(void)
 #define DO_UPDATE 1
 #define DO_DELETE 0
 
-static void test_update_delete(int fn, void *data)
+static void test_update_delete(unsigned int fn, void *data)
 {
         int do_update = ((int *)data)[1];
         int fd = ((int *)data)[0];
diff --git a/tools/testing/selftests/bpf/test_offload.py b/tools/testing/selftests/bpf/test_offload.py
index d59642e70f56..84bea3985d64 100755
--- a/tools/testing/selftests/bpf/test_offload.py
+++ b/tools/testing/selftests/bpf/test_offload.py
@@ -23,6 +23,7 @@ import string
 import struct
 import subprocess
 import time
+import traceback
 
 logfile = None
 log_level = 1
@@ -78,7 +79,9 @@ def fail(cond, msg):
     if not cond:
         return
     print("FAIL: " + msg)
-    log("FAIL: " + msg, "", level=1)
+    tb = "".join(traceback.extract_stack().format())
+    print(tb)
+    log("FAIL: " + msg, tb, level=1)
     os.sys.exit(1)
 
 def start_test(msg):
@@ -589,6 +592,15 @@ def check_verifier_log(output, reference):
             return
     fail(True, "Missing or incorrect message from netdevsim in verifier log")
 
+def check_multi_basic(two_xdps):
+    fail(two_xdps["mode"] != 4, "Bad mode reported with multiple programs")
+    fail("prog" in two_xdps, "Base program reported in multi program mode")
+    fail(len(two_xdps["attached"]) != 2,
+         "Wrong attached program count with two programs")
+    fail(two_xdps["attached"][0]["prog"]["id"] ==
+         two_xdps["attached"][1]["prog"]["id"],
+         "Offloaded and other programs have the same id")
+
 def test_spurios_extack(sim, obj, skip_hw, needle):
     res = sim.cls_bpf_add_filter(obj, prio=1, handle=1, skip_hw=skip_hw,
                                  include_stderr=True)
@@ -600,6 +612,67 @@ def test_spurios_extack(sim, obj, skip_hw, needle):
                             include_stderr=True)
     check_no_extack(res, needle)
 
+def test_multi_prog(sim, obj, modename, modeid):
+    start_test("Test multi-attachment XDP - %s + offload..." %
+               (modename or "default", ))
+    sim.set_xdp(obj, "offload")
+    xdp = sim.ip_link_show(xdp=True)["xdp"]
+    offloaded = sim.dfs_read("bpf_offloaded_id")
+    fail("prog" not in xdp, "Base program not reported in single program mode")
+    fail(len(xdp["attached"]) != 1,
+         "Wrong attached program count with one program")
+
+    sim.set_xdp(obj, modename)
+    two_xdps = sim.ip_link_show(xdp=True)["xdp"]
+
+    fail(xdp["attached"][0] not in two_xdps["attached"],
+         "Offload program not reported after other activated")
+    check_multi_basic(two_xdps)
+
+    offloaded2 = sim.dfs_read("bpf_offloaded_id")
+    fail(offloaded != offloaded2,
+         "Offload ID changed after loading other program")
+
+    start_test("Test multi-attachment XDP - replace...")
+    ret, _, err = sim.set_xdp(obj, "offload", fail=False, include_stderr=True)
+    fail(ret == 0, "Replaced one of programs without -force")
+    check_extack(err, "XDP program already attached.", args)
+
+    if modename == "" or modename == "drv":
+        othermode = "" if modename == "drv" else "drv"
+        start_test("Test multi-attachment XDP - detach...")
+        ret, _, err = sim.unset_xdp(othermode, force=True,
+                                    fail=False, include_stderr=True)
+        fail(ret == 0, "Removed program with a bad mode")
+        check_extack(err, "program loaded with different flags.", args)
+
+    sim.unset_xdp("offload")
+    xdp = sim.ip_link_show(xdp=True)["xdp"]
+    offloaded = sim.dfs_read("bpf_offloaded_id")
+
+    fail(xdp["mode"] != modeid, "Bad mode reported after multiple programs")
+    fail("prog" not in xdp,
+         "Base program not reported after multi program mode")
+    fail(xdp["attached"][0] not in two_xdps["attached"],
+         "Offload program not reported after other activated")
+    fail(len(xdp["attached"]) != 1,
+         "Wrong attached program count with remaining programs")
+    fail(offloaded != "0", "Offload ID reported with only other program left")
+
+    start_test("Test multi-attachment XDP - reattach...")
+    sim.set_xdp(obj, "offload")
+    two_xdps = sim.ip_link_show(xdp=True)["xdp"]
+
+    fail(xdp["attached"][0] not in two_xdps["attached"],
+         "Other program not reported after offload activated")
+    check_multi_basic(two_xdps)
+
+    start_test("Test multi-attachment XDP - device remove...")
+    sim.remove()
+
+    sim = NetdevSim()
+    sim.set_ethtool_tc_offloads(True)
+    return sim
 
 # Parse command line
 parser = argparse.ArgumentParser()
@@ -842,7 +915,9 @@ try:
     ret, _, err = sim.set_xdp(obj, "generic", force=True,
                               fail=False, include_stderr=True)
     fail(ret == 0, "Replaced XDP program with a program in different mode")
-    fail(err.count("File exists") != 1, "Replaced driver XDP with generic")
+    check_extack(err,
+                 "native and generic XDP can't be active at the same time.",
+                 args)
     ret, _, err = sim.set_xdp(obj, "", force=True,
                               fail=False, include_stderr=True)
     fail(ret == 0, "Replaced XDP program with a program in different mode")
@@ -931,59 +1006,9 @@ try:
     rm(pin_file)
     bpftool_prog_list_wait(expected=0)
 
-    start_test("Test multi-attachment XDP - attach...")
-    sim.set_xdp(obj, "offload")
-    xdp = sim.ip_link_show(xdp=True)["xdp"]
-    offloaded = sim.dfs_read("bpf_offloaded_id")
-    fail("prog" not in xdp, "Base program not reported in single program mode")
-    fail(len(ipl["xdp"]["attached"]) != 1,
-         "Wrong attached program count with one program")
-
-    sim.set_xdp(obj, "")
-    two_xdps = sim.ip_link_show(xdp=True)["xdp"]
-    offloaded2 = sim.dfs_read("bpf_offloaded_id")
-
-    fail(two_xdps["mode"] != 4, "Bad mode reported with multiple programs")
-    fail("prog" in two_xdps, "Base program reported in multi program mode")
-    fail(xdp["attached"][0] not in two_xdps["attached"],
-         "Offload program not reported after driver activated")
-    fail(len(two_xdps["attached"]) != 2,
-         "Wrong attached program count with two programs")
-    fail(two_xdps["attached"][0]["prog"]["id"] ==
-         two_xdps["attached"][1]["prog"]["id"],
-         "offloaded and drv programs have the same id")
-    fail(offloaded != offloaded2,
-         "offload ID changed after loading driver program")
-
-    start_test("Test multi-attachment XDP - replace...")
-    ret, _, err = sim.set_xdp(obj, "offload", fail=False, include_stderr=True)
-    fail(err.count("busy") != 1, "Replaced one of programs without -force")
-
-    start_test("Test multi-attachment XDP - detach...")
-    ret, _, err = sim.unset_xdp("drv", force=True,
-                                fail=False, include_stderr=True)
-    fail(ret == 0, "Removed program with a bad mode")
-    check_extack(err, "program loaded with different flags.", args)
-
-    sim.unset_xdp("offload")
-    xdp = sim.ip_link_show(xdp=True)["xdp"]
-    offloaded = sim.dfs_read("bpf_offloaded_id")
-
-    fail(xdp["mode"] != 1, "Bad mode reported after multiple programs")
-    fail("prog" not in xdp,
-         "Base program not reported after multi program mode")
-    fail(xdp["attached"][0] not in two_xdps["attached"],
-         "Offload program not reported after driver activated")
-    fail(len(ipl["xdp"]["attached"]) != 1,
-         "Wrong attached program count with remaining programs")
-    fail(offloaded != "0", "offload ID reported with only driver program left")
-
-    start_test("Test multi-attachment XDP - device remove...")
-    sim.set_xdp(obj, "offload")
-    sim.remove()
-
-    sim = NetdevSim()
-    sim.set_ethtool_tc_offloads(True)
+    sim = test_multi_prog(sim, obj, "", 1)
+    sim = test_multi_prog(sim, obj, "drv", 1)
+    sim = test_multi_prog(sim, obj, "generic", 2)
 
     start_test("Test mixing of TC and XDP...")
     sim.tc_add_ingress()
diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index a08d026ac396..c52bd90fbb34 100644
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -10,6 +10,7 @@
 #include <string.h>
 #include <assert.h>
 #include <stdlib.h>
+#include <stdarg.h>
 #include <time.h>
 
 #include <linux/types.h>
@@ -1783,6 +1784,15 @@ static void test_task_fd_query_tp(void)
                                    "sys_enter_read");
 }
 
+static int libbpf_debug_print(enum libbpf_print_level level,
+                              const char *format, va_list args)
+{
+        if (level == LIBBPF_DEBUG)
+                return 0;
+
+        return vfprintf(stderr, format, args);
+}
+
 static void test_reference_tracking()
 {
         const char *file = "./test_sk_lookup_kern.o";
@@ -1809,9 +1819,9 @@ static void test_reference_tracking()
 
                 /* Expect verifier failure if test name has 'fail' */
                 if (strstr(title, "fail") != NULL) {
-                        libbpf_set_print(NULL, NULL, NULL);
+                        libbpf_set_print(NULL);
                         err = !bpf_program__load(prog, "GPL", 0);
-                        libbpf_set_print(printf, printf, NULL);
+                        libbpf_set_print(libbpf_debug_print);
                 } else {
                         err = bpf_program__load(prog, "GPL", 0);
                 }
diff --git a/tools/testing/selftests/bpf/verifier/ctx_sk_msg.c b/tools/testing/selftests/bpf/verifier/ctx_sk_msg.c
index b0195770da6a..c6c69220a569 100644
--- a/tools/testing/selftests/bpf/verifier/ctx_sk_msg.c
+++ b/tools/testing/selftests/bpf/verifier/ctx_sk_msg.c
@@ -100,6 +100,7 @@
         .errstr = "invalid bpf_context access",
         .result = REJECT,
         .prog_type = BPF_PROG_TYPE_SK_MSG,
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "invalid read past end of SK_MSG",
diff --git a/tools/testing/selftests/bpf/verifier/ctx_skb.c b/tools/testing/selftests/bpf/verifier/ctx_skb.c
index 881f1c7f57a1..c660deb582f1 100644
--- a/tools/testing/selftests/bpf/verifier/ctx_skb.c
+++ b/tools/testing/selftests/bpf/verifier/ctx_skb.c
@@ -687,6 +687,7 @@
         },
         .errstr = "invalid bpf_context access",
         .result = REJECT,
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "check skb->hash half load not permitted, unaligned 3",
diff --git a/tools/testing/selftests/bpf/verifier/jmp32.c b/tools/testing/selftests/bpf/verifier/jmp32.c
index ceb39ffa0e88..f0961c58581e 100644
--- a/tools/testing/selftests/bpf/verifier/jmp32.c
+++ b/tools/testing/selftests/bpf/verifier/jmp32.c
@@ -27,6 +27,7 @@
                   .data64 = { 1ULL << 63 | 1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jset32: BPF_X",
@@ -58,6 +59,7 @@
                   .data64 = { 1ULL << 63 | 1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jset32: min/max deduction",
@@ -93,6 +95,7 @@
                   .data64 = { -1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jeq32: BPF_X",
@@ -119,6 +122,7 @@
                   .data64 = { 1ULL << 63 | 1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jeq32: min/max deduction",
@@ -154,6 +158,7 @@
                   .data64 = { -1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jne32: BPF_X",
@@ -180,6 +185,7 @@
                   .data64 = { 1ULL << 63 | 2, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jne32: min/max deduction",
@@ -218,6 +224,7 @@
                   .data64 = { 0, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jge32: BPF_X",
@@ -244,6 +251,7 @@
                   .data64 = { (UINT_MAX - 1) | 2ULL << 32, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jge32: min/max deduction",
@@ -284,6 +292,7 @@
                   .data64 = { 0, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jgt32: BPF_X",
@@ -310,6 +319,7 @@
                   .data64 = { (UINT_MAX - 1) | 2ULL << 32, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jgt32: min/max deduction",
@@ -350,6 +360,7 @@
                   .data64 = { INT_MAX, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jle32: BPF_X",
@@ -376,6 +387,7 @@
                   .data64 = { UINT_MAX, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jle32: min/max deduction",
@@ -416,6 +428,7 @@
                   .data64 = { INT_MAX - 1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jlt32: BPF_X",
@@ -442,6 +455,7 @@
                   .data64 = { (INT_MAX - 1) | 3ULL << 32, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jlt32: min/max deduction",
@@ -482,6 +496,7 @@
                   .data64 = { -2, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jsge32: BPF_X",
@@ -508,6 +523,7 @@
                   .data64 = { -2, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jsge32: min/max deduction",
@@ -548,6 +564,7 @@
                   .data64 = { 1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jsgt32: BPF_X",
@@ -574,6 +591,7 @@
                   .data64 = { 0x7fffffff, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jsgt32: min/max deduction",
@@ -614,6 +632,7 @@
                   .data64 = { 1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jsle32: BPF_X",
@@ -640,6 +659,7 @@
                   .data64 = { 0x7fffffff | 2ULL << 32, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jsle32: min/max deduction",
@@ -680,6 +700,7 @@
                   .data64 = { 1, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jslt32: BPF_X",
@@ -706,6 +727,7 @@
                   .data64 = { 0x7fffffff | 2ULL << 32, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jslt32: min/max deduction",
diff --git a/tools/testing/selftests/bpf/verifier/jset.c b/tools/testing/selftests/bpf/verifier/jset.c
index 7e14037acfaf..8dcd4e0383d5 100644
--- a/tools/testing/selftests/bpf/verifier/jset.c
+++ b/tools/testing/selftests/bpf/verifier/jset.c
@@ -53,6 +53,7 @@
                   .data64 = { ~0ULL, }
                 },
         },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jset: sign-extend",
@@ -70,6 +71,7 @@
         .result = ACCEPT,
         .retval = 2,
         .data = { 1, 0, 0, 0, 0, 0, 0, 1, },
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "jset: known const compare",
diff --git a/tools/testing/selftests/bpf/verifier/spill_fill.c b/tools/testing/selftests/bpf/verifier/spill_fill.c
index d58db72fdfe8..45d43bf82f26 100644
--- a/tools/testing/selftests/bpf/verifier/spill_fill.c
+++ b/tools/testing/selftests/bpf/verifier/spill_fill.c
@@ -46,6 +46,7 @@
         .errstr_unpriv = "attempt to corrupt spilled",
         .errstr = "R0 invalid mem access 'inv",
         .result = REJECT,
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "check corrupted spill/fill, LSB",
diff --git a/tools/testing/selftests/bpf/verifier/spin_lock.c b/tools/testing/selftests/bpf/verifier/spin_lock.c
index d829eef372a4..781621facae4 100644
--- a/tools/testing/selftests/bpf/verifier/spin_lock.c
+++ b/tools/testing/selftests/bpf/verifier/spin_lock.c
@@ -83,6 +83,7 @@
         .result_unpriv = REJECT,
         .errstr_unpriv = "",
         .prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "spin_lock: test4 direct ld/st",
@@ -112,6 +113,7 @@
         .result_unpriv = REJECT,
         .errstr_unpriv = "",
         .prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "spin_lock: test5 call within a locked region",
diff --git a/tools/testing/selftests/bpf/verifier/value_ptr_arith.c b/tools/testing/selftests/bpf/verifier/value_ptr_arith.c
index 9ab5ace83e02..4b721a77bebb 100644
--- a/tools/testing/selftests/bpf/verifier/value_ptr_arith.c
+++ b/tools/testing/selftests/bpf/verifier/value_ptr_arith.c
@@ -512,6 +512,7 @@
         .fixup_map_array_48b = { 3 },
         .result = ACCEPT,
         .retval = 0xabcdef12,
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "map access: unknown scalar += value_ptr, 3",
@@ -537,6 +538,7 @@
         .result_unpriv = REJECT,
         .errstr_unpriv = "R0 pointer arithmetic of map value goes out of range",
         .retval = 0xabcdef12,
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "map access: unknown scalar += value_ptr, 4",
@@ -559,6 +561,7 @@
         .result = REJECT,
         .errstr = "R1 max value is outside of the array range",
         .errstr_unpriv = "R1 pointer arithmetic of map value goes out of range",
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "map access: value_ptr += unknown scalar, 1",
@@ -598,6 +601,7 @@
         .fixup_map_array_48b = { 3 },
         .result = ACCEPT,
         .retval = 0xabcdef12,
+        .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
 },
 {
         "map access: value_ptr += unknown scalar, 3",