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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>
hifive-unleashed-5.1
David Ahern 2015-08-28 08:42:09 -07:00 committed by David S. Miller
parent 0d5cdef8d5
commit f6d3c19274
4 changed files with 120 additions and 0 deletions
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111
include/trace/events/fib.h 100644
View File

@ -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>

1
net/core/net-traces.c
View File

@ -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);

3
net/ipv4/fib_frontend.c
View File

@ -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;

5
net/ipv4/fib_trie.c
View File

@ -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;
}
}