net: FIB tracepoints

A few useful tracepoints developing VRF driver.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 120 insertions, 0 deletions

diff --git a/include/trace/events/fib.h b/include/trace/events/fib.h
new file mode 100644
index 000000000000..4030f75410d7
--- /dev/null
+++ b/include/trace/events/fib.h
@@ -0,0 +1,111 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM fib
+
+#if !defined(_TRACE_FIB_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FIB_H
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <net/ip_fib.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(fib_table_lookup,
+
+        TP_PROTO(int tb_id, const struct flowi4 *flp),
+
+        TP_ARGS(tb_id, flp),
+
+        TP_STRUCT__entry(
+                __field(        int,    tb_id           )
+                __field(        int,    oif             )
+                __field(        int,    iif             )
+                __field(        __u8,   tos             )
+                __field(        __u8,   scope           )
+                __field(        __u8,   flags           )
+                __array(        __u8,   src,    4       )
+                __array(        __u8,   dst,    4       )
+        ),
+
+        TP_fast_assign(
+                __be32 *p32;
+
+                __entry->tb_id = tb_id;
+                __entry->oif = flp->flowi4_oif;
+                __entry->iif = flp->flowi4_iif;
+                __entry->tos = flp->flowi4_tos;
+                __entry->scope = flp->flowi4_scope;
+                __entry->flags = flp->flowi4_flags;
+
+                p32 = (__be32 *) __entry->src;
+                *p32 = flp->saddr;
+
+                p32 = (__be32 *) __entry->dst;
+                *p32 = flp->daddr;
+        ),
+
+        TP_printk("table %d oif %d iif %d src %pI4 dst %pI4 tos %d scope %d flags %x",
+                  __entry->tb_id, __entry->oif, __entry->iif,
+                  __entry->src, __entry->dst, __entry->tos, __entry->scope,
+                  __entry->flags)
+);
+
+TRACE_EVENT(fib_table_lookup_nh,
+
+        TP_PROTO(const struct fib_nh *nh),
+
+        TP_ARGS(nh),
+
+        TP_STRUCT__entry(
+                __string(       name,   nh->nh_dev->name)
+                __field(        int,    oif             )
+                __array(        __u8,   src,    4       )
+        ),
+
+        TP_fast_assign(
+                __be32 *p32 = (__be32 *) __entry->src;
+
+                __assign_str(name, nh->nh_dev ? nh->nh_dev->name : "not set");
+                __entry->oif = nh->nh_oif;
+                *p32 = nh->nh_saddr;
+        ),
+
+        TP_printk("nexthop dev %s oif %d src %pI4",
+                  __get_str(name), __entry->oif, __entry->src)
+);
+
+TRACE_EVENT(fib_validate_source,
+
+        TP_PROTO(const struct net_device *dev, const struct flowi4 *flp),
+
+        TP_ARGS(dev, flp),
+
+        TP_STRUCT__entry(
+                __string(       name,   dev->name       )
+                __field(        int,    oif             )
+                __field(        int,    iif             )
+                __array(        __u8,   src,    4       )
+                __array(        __u8,   dst,    4       )
+        ),
+
+        TP_fast_assign(
+                __be32 *p32;
+
+                __assign_str(name, dev ? dev->name : "not set");
+                __entry->oif = flp->flowi4_oif;
+                __entry->iif = flp->flowi4_iif;
+
+                p32 = (__be32 *) __entry->src;
+                *p32 = flp->saddr;
+
+                p32 = (__be32 *) __entry->dst;
+                *p32 = flp->daddr;
+        ),
+
+        TP_printk("dev %s oif %d iif %d src %pI4 dst %pI4",
+                  __get_str(name), __entry->oif, __entry->iif,
+                  __entry->src, __entry->dst)
+);
+#endif /* _TRACE_FIB_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index ba3c0120786c..adef015b2f41 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -31,6 +31,7 @@
 #include <trace/events/napi.h>
 #include <trace/events/sock.h>
 #include <trace/events/udp.h>
+#include <trace/events/fib.h>
 
 EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);
 
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 7fa277176c33..4036c94dfbe1 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -46,6 +46,7 @@
 #include <net/rtnetlink.h>
 #include <net/xfrm.h>
 #include <net/vrf.h>
+#include <trace/events/fib.h>
 
 #ifndef CONFIG_IP_MULTIPLE_TABLES
 
@@ -344,6 +345,8 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
 
         fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
 
+        trace_fib_validate_source(dev, &fl4);
+
         net = dev_net(dev);
         if (fib_lookup(net, &fl4, &res, 0))
                 goto last_resort;
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 5154f81c5326..26d6ffb6d23c 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -81,6 +81,7 @@
 #include <net/sock.h>
 #include <net/ip_fib.h>
 #include <net/switchdev.h>
+#include <trace/events/fib.h>
 #include "fib_lookup.h"
 
 #define MAX_STAT_DEPTH 32
@@ -1278,6 +1279,8 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
         unsigned long index;
         t_key cindex;
 
+        trace_fib_table_lookup(tb->tb_id, flp);
+
         pn = t->kv;
         cindex = 0;
 
@@ -1442,6 +1445,8 @@ found:
 #ifdef CONFIG_IP_FIB_TRIE_STATS
                         this_cpu_inc(stats->semantic_match_passed);
 #endif
+                        trace_fib_table_lookup_nh(nh);
+
                         return err;
                 }
         }