From 9f323973c915d402378cb3e1336dd6ed4c45144b Mon Sep 17 00:00:00 2001 From: David Ahern Date: Wed, 23 May 2018 17:08:47 -0700 Subject: [PATCH] net/ipv4: Udate fib_table_lookup tracepoint Commit 4a2d73a4fb36 ("ipv4: fib_rules: support match on sport, dport and ip proto") added support for protocol and ports to FIB rules. Update the FIB lookup tracepoint to dump the parameters. In addition, make the IPv4 tracepoint similar to the IPv6 one where the lookup parameters and result are dumped in 1 event. It is much easier to use and understand the outcome of the lookup. Signed-off-by: David Ahern Signed-off-by: David S. Miller --- include/trace/events/fib.h | 74 ++++++++++++++++++++++---------------- net/ipv4/fib_trie.c | 14 +++++--- 2 files changed, 53 insertions(+), 35 deletions(-) diff --git a/include/trace/events/fib.h b/include/trace/events/fib.h index 81b7e985bb45..f5a1d4c518d8 100644 --- a/include/trace/events/fib.h +++ b/include/trace/events/fib.h @@ -12,12 +12,14 @@ TRACE_EVENT(fib_table_lookup, - TP_PROTO(u32 tb_id, const struct flowi4 *flp), + TP_PROTO(u32 tb_id, const struct flowi4 *flp, + const struct fib_nh *nh, int err), - TP_ARGS(tb_id, flp), + TP_ARGS(tb_id, flp, nh, err), TP_STRUCT__entry( __field( u32, tb_id ) + __field( int, err ) __field( int, oif ) __field( int, iif ) __field( __u8, tos ) @@ -25,12 +27,19 @@ TRACE_EVENT(fib_table_lookup, __field( __u8, flags ) __array( __u8, src, 4 ) __array( __u8, dst, 4 ) + __array( __u8, gw, 4 ) + __array( __u8, saddr, 4 ) + __field( u16, sport ) + __field( u16, dport ) + __field( u8, proto ) + __dynamic_array(char, name, IFNAMSIZ ) ), TP_fast_assign( __be32 *p32; __entry->tb_id = tb_id; + __entry->err = err; __entry->oif = flp->flowi4_oif; __entry->iif = flp->flowi4_iif; __entry->tos = flp->flowi4_tos; @@ -42,36 +51,41 @@ TRACE_EVENT(fib_table_lookup, p32 = (__be32 *) __entry->dst; *p32 = flp->daddr; + + __entry->proto = flp->flowi4_proto; + if (__entry->proto == IPPROTO_TCP || + __entry->proto == IPPROTO_UDP) { + __entry->sport = ntohs(flp->fl4_sport); + __entry->dport = ntohs(flp->fl4_dport); + } else { + __entry->sport = 0; + __entry->dport = 0; + } + + if (nh) { + p32 = (__be32 *) __entry->saddr; + *p32 = nh->nh_saddr; + + p32 = (__be32 *) __entry->gw; + *p32 = nh->nh_gw; + + __assign_str(name, nh->nh_dev ? nh->nh_dev->name : "-"); + } else { + p32 = (__be32 *) __entry->saddr; + *p32 = 0; + + p32 = (__be32 *) __entry->gw; + *p32 = 0; + + __assign_str(name, "-"); + } ), - TP_printk("table %u 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) + TP_printk("table %u oif %d iif %d proto %u %pI4/%u -> %pI4/%u tos %d scope %d flags %x ==> dev %s gw %pI4 src %pI4 err %d", + __entry->tb_id, __entry->oif, __entry->iif, __entry->proto, + __entry->src, __entry->sport, __entry->dst, __entry->dport, + __entry->tos, __entry->scope, __entry->flags, + __get_str(name), __entry->gw, __entry->saddr, __entry->err) ); TRACE_EVENT(fib_validate_source, diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index 3dcffd3ce98c..65c340f230ae 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -1326,14 +1326,14 @@ 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; n = get_child_rcu(pn, cindex); - if (!n) + if (!n) { + trace_fib_table_lookup(tb->tb_id, flp, NULL, -EAGAIN); return -EAGAIN; + } #ifdef CONFIG_IP_FIB_TRIE_STATS this_cpu_inc(stats->gets); @@ -1416,8 +1416,11 @@ backtrace: * nothing for us to do as we do not have any * further nodes to parse. */ - if (IS_TRIE(pn)) + if (IS_TRIE(pn)) { + trace_fib_table_lookup(tb->tb_id, flp, + NULL, -EAGAIN); return -EAGAIN; + } #ifdef CONFIG_IP_FIB_TRIE_STATS this_cpu_inc(stats->backtrack); #endif @@ -1459,6 +1462,7 @@ found: #ifdef CONFIG_IP_FIB_TRIE_STATS this_cpu_inc(stats->semantic_match_passed); #endif + trace_fib_table_lookup(tb->tb_id, flp, NULL, err); return err; } if (fi->fib_flags & RTNH_F_DEAD) @@ -1494,7 +1498,7 @@ found: #ifdef CONFIG_IP_FIB_TRIE_STATS this_cpu_inc(stats->semantic_match_passed); #endif - trace_fib_table_lookup_nh(nh); + trace_fib_table_lookup(tb->tb_id, flp, nh, err); return err; }