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net: IPv6 fib lookup tracepoint

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Add tracepoint to show fib6 table lookups and result.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2015-11-19 12:24:22 -08:00 committed by David S. Miller
parent e2f9dc3bd2
commit b811580d91
3 changed files with 90 additions and 0 deletions
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76
include/trace/events/fib6.h Normal file
View File

@ -0,0 +1,76 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM fib6
#if !defined(_TRACE_FIB6_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_FIB6_H
#include <linux/in6.h>
#include <net/flow.h>
#include <net/ip6_fib.h>
#include <linux/tracepoint.h>
TRACE_EVENT(fib6_table_lookup,
TP_PROTO(const struct net *net, const struct rt6_info *rt,
u32 tb_id, const struct flowi6 *flp),
TP_ARGS(net, rt, tb_id, flp),
TP_STRUCT__entry(
__field( u32, tb_id )
__field( int, oif )
__field( int, iif )
__field( __u8, tos )
__field( __u8, scope )
__field( __u8, flags )
__array( __u8, src, 16 )
__array( __u8, dst, 16 )
__dynamic_array( char, name, IFNAMSIZ )
__array( __u8, gw, 16 )
),
TP_fast_assign(
struct in6_addr *in6;
__entry->tb_id = tb_id;
__entry->oif = flp->flowi6_oif;
__entry->iif = flp->flowi6_iif;
__entry->tos = flp->flowi6_tos;
__entry->scope = flp->flowi6_scope;
__entry->flags = flp->flowi6_flags;
in6 = (struct in6_addr *)__entry->src;
*in6 = flp->saddr;
in6 = (struct in6_addr *)__entry->dst;
*in6 = flp->daddr;
if (rt->rt6i_idev) {
__assign_str(name, rt->rt6i_idev->dev->name);
} else {
__assign_str(name, "");
}
if (rt == net->ipv6.ip6_null_entry) {
struct in6_addr in6_zero = {};
in6 = (struct in6_addr *)__entry->gw;
*in6 = in6_zero;
} else if (rt) {
in6 = (struct in6_addr *)__entry->gw;
*in6 = rt->rt6i_gateway;
}
),
TP_printk("table %3u oif %d iif %d src %pI6c dst %pI6c tos %d scope %d flags %x ==> dev %s gw %pI6c",
__entry->tb_id, __entry->oif, __entry->iif,
__entry->src, __entry->dst, __entry->tos, __entry->scope,
__entry->flags, __get_str(name), __entry->gw)
);
#endif /* _TRACE_FIB6_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

4
net/core/net-traces.c
View File

@ -32,6 +32,10 @@
#include <trace/events/sock.h>
#include <trace/events/udp.h>
#include <trace/events/fib.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <trace/events/fib6.h>
EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
#endif
EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);

10
net/ipv6/route.c
View File

@ -62,6 +62,7 @@
#include <net/lwtunnel.h>
#include <net/ip_tunnels.h>
#include <net/l3mdev.h>
#include <trace/events/fib6.h>
#include <asm/uaccess.h>
@ -865,6 +866,9 @@ restart:
}
dst_use(&rt->dst, jiffies);
read_unlock_bh(&table->tb6_lock);
trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
return rt;
}
@ -1078,6 +1082,8 @@ redo_rt6_select:
read_unlock_bh(&table->tb6_lock);
rt6_dst_from_metrics_check(rt);
trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
return rt;
} else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
!(rt->rt6i_flags & RTF_GATEWAY))) {
@ -1101,6 +1107,8 @@ redo_rt6_select:
uncached_rt = net->ipv6.ip6_null_entry;
dst_hold(&uncached_rt->dst);
trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
return uncached_rt;
} else {
@ -1125,6 +1133,7 @@ redo_rt6_select:
dst_release(&rt->dst);
}
trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
return pcpu_rt;
}
@ -1474,6 +1483,7 @@ out:
read_unlock_bh(&table->tb6_lock);
trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
return rt;
};