bpftool: print program device bound info

If program is bound to a device, print the name of the relevant
interface or unknown if the netdev has since been removed.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 0 deletions

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 250f80fd46aa..d3ab808dc882 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -41,6 +41,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <net/if.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
@@ -229,6 +230,21 @@ static void print_prog_json(struct bpf_prog_info *info, int fd)
                      info->tag[0], info->tag[1], info->tag[2], info->tag[3],
                      info->tag[4], info->tag[5], info->tag[6], info->tag[7]);
 
+        if (info->status & BPF_PROG_STATUS_DEV_BOUND) {
+                jsonw_name(json_wtr, "dev");
+                if (info->ifindex) {
+                        char name[IF_NAMESIZE];
+
+                        if (!if_indextoname(info->ifindex, name))
+                                jsonw_printf(json_wtr, "\"ifindex:%d\"",
+                                             info->ifindex);
+                        else
+                                jsonw_printf(json_wtr, "\"%s\"", name);
+                } else {
+                        jsonw_printf(json_wtr, "\"unknown\"");
+                }
+        }
+
         if (info->load_time) {
                 char buf[32];
 
@@ -274,6 +290,21 @@ static void print_prog_plain(struct bpf_prog_info *info, int fd)
 
         printf("tag ");
         fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
+        printf(" ");
+
+        if (info->status & BPF_PROG_STATUS_DEV_BOUND) {
+                printf("dev ");
+                if (info->ifindex) {
+                        char name[IF_NAMESIZE];
+
+                        if (!if_indextoname(info->ifindex, name))
+                                printf("ifindex:%d ", info->ifindex);
+                        else
+                                printf("%s ", name);
+                } else {
+                        printf("unknown ");
+                }
+        }
         printf("\n");
 
         if (info->load_time) {