net: IPv6 fib lookup tracepoint

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>

diff --git a/include/trace/events/fib6.h b/include/trace/events/fib6.h
new file mode 100644 (file)
index 0000000..4cf6bac
--- /dev/null
+++ b/include/trace/events/fib6.h
@@ -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>

diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index adef015..92da5e4 100644 (file)
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -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);
 

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 6f01fe1..89758be 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -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;
 };