[PATCH net-next v2 3/3] ipv4: Report netns cookie in fib_table_lookup tracepoint

[Ido Schimmel <idosch@nvidia.com>]

The fib_table_lookup tracepoint does not report the network namespace in
which the lookup was performed, making it impossible to tell apart
lookups performed in different namespaces.

Report the network namespace cookie now that the namespace is passed to
the tracepoint.

Assisted-by: LLM
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ferenc Fejes <ferenc@fejes.dev>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
---

Notes:
    Sashiko: There is a pre-existing issue here regarding an uninitialized
    gateway address. I will take care of it separately.

 include/trace/events/fib.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/fib.h b/include/trace/events/fib.h
index 341905b5edf3..e0ee14d6ca45 100644
--- a/include/trace/events/fib.h
+++ b/include/trace/events/fib.h
@@ -36,6 +36,7 @@ TRACE_EVENT(fib_table_lookup,
 		__field(	u16,	sport		)
 		__field(	u16,	dport		)
 		__array(char,  name,   IFNAMSIZ )
+		__field(	u64,	net_cookie	)
 	),
 
 	TP_fast_assign(
@@ -91,13 +92,16 @@ TRACE_EVENT(fib_table_lookup,
 			in6 = (struct in6_addr *)__entry->gw6;
 			*in6 = in6addr_any;
 		}
+
+		__entry->net_cookie = net->net_cookie;
 	),
 
-	TP_printk("table %u oif %d iif %d proto %u %pI4/%u -> %pI4/%u tos %d scope %d flags %x ==> dev %s gw %pI4/%pI6c err %d",
+	TP_printk("table %u oif %d iif %d proto %u %pI4/%u -> %pI4/%u tos %d scope %d flags %x ==> dev %s gw %pI4/%pI6c err %d net_cookie %llu",
 		  __entry->tb_id, __entry->oif, __entry->iif, __entry->proto,
 		  __entry->src, __entry->sport, __entry->dst, __entry->dport,
 		  __entry->tos, __entry->scope, __entry->flags,
-		  __entry->name, __entry->gw4, __entry->gw6, __entry->err)
+		  __entry->name, __entry->gw4, __entry->gw6, __entry->err,
+		  __entry->net_cookie)
 );
 #endif /* _TRACE_FIB_H */
 
-- 
2.55.0