net/mlx5e: Add trace point for neigh used value update

Allow tracing result of neigh used value update task that is executed
periodically on workqueue.

Usage example:
 ># cd /sys/kernel/debug/tracing
 ># echo mlx5:mlx5e_tc_update_neigh_used_value >> set_event
 ># cat trace
    ...
    kworker/u48:4-8806  [009] ...1 55117.882428: mlx5e_tc_update_neigh_used_value:
netdev: ens1f0 IPv4: 1.1.1.10 IPv6: ::ffff:1.1.1.10 neigh_used=1

Added corresponding documentation in
    Documentation/networking/device-driver/mellanox/mlx5.rst

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Dmytro Linkin <dmitrolin@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/Documentation/networking/device_drivers/mellanox/mlx5.rst b/Documentation/networking/device_drivers/mellanox/mlx5.rst
index 1339dbf524315305b60170485cf30725517717f2..b2f21ce9b090135e75d42e9535124c419b704a96 100644 (file)
--- a/Documentation/networking/device_drivers/mellanox/mlx5.rst
+++ b/Documentation/networking/device_drivers/mellanox/mlx5.rst
@@ -251,3 +251,10 @@ tc and eswitch offloads tracepoints:
     $ cat /sys/kernel/debug/tracing/trace
     ...
     tc-6546  [010] ...1  2679.704889: mlx5e_stats_flower: cookie=0000000060eb3d6a bytes=0 packets=0 lastused=4295560217
+
+- mlx5e_tc_update_neigh_used_value: trace tunnel rule neigh update value offloaded to mlx5::
+
+    $ echo mlx5:mlx5e_tc_update_neigh_used_value >> /sys/kernel/debug/tracing/set_event
+    $ cat /sys/kernel/debug/tracing/trace
+    ...
+    kworker/u48:4-8806  [009] ...1 55117.882428: mlx5e_tc_update_neigh_used_value: netdev: ens1f0 IPv4: 1.1.1.10 IPv6: ::ffff:1.1.1.10 neigh_used=1

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/en_tc_tracepoint.h b/drivers/net/ethernet/mellanox/mlx5/core/diag/en_tc_tracepoint.h
index a362100fe6d330b5dfe18e53bdc993315c6e9be0..d4e6cfaaade3726547f9e5d0db2030cd69c30c26 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/en_tc_tracepoint.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/en_tc_tracepoint.h
@@ -10,6 +10,7 @@
 #include <linux/tracepoint.h>
 #include <linux/trace_seq.h>
 #include <net/flow_offload.h>
+#include "en_rep.h"
 
 #define __parse_action(ids, num) parse_action(p, ids, num)
 
@@ -73,6 +74,36 @@ TRACE_EVENT(mlx5e_stats_flower,
                      )
 );
 
+TRACE_EVENT(mlx5e_tc_update_neigh_used_value,
+           TP_PROTO(const struct mlx5e_neigh_hash_entry *nhe, bool neigh_used),
+           TP_ARGS(nhe, neigh_used),
+           TP_STRUCT__entry(__string(devname, nhe->m_neigh.dev->name)
+                            __array(u8, v4, 4)
+                            __array(u8, v6, 16)
+                            __field(bool, neigh_used)
+                            ),
+           TP_fast_assign(const struct mlx5e_neigh *mn = &nhe->m_neigh;
+                       struct in6_addr *pin6;
+                       __be32 *p32;
+
+                       __assign_str(devname, mn->dev->name);
+                       __entry->neigh_used = neigh_used;
+
+                       p32 = (__be32 *)__entry->v4;
+                       pin6 = (struct in6_addr *)__entry->v6;
+                       if (mn->family == AF_INET) {
+                               *p32 = mn->dst_ip.v4;
+                               ipv6_addr_set_v4mapped(*p32, pin6);
+                       } else if (mn->family == AF_INET6) {
+                               *pin6 = mn->dst_ip.v6;
+                       }
+                       ),
+           TP_printk("netdev: %s IPv4: %pI4 IPv6: %pI6c neigh_used=%d\n",
+                     __get_str(devname), __entry->v4, __entry->v6,
+                     __entry->neigh_used
+                     )
+);
+
 #endif /* _MLX5_TC_TP_ */
 
 /* This part must be outside protection */

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index c40cca08c8cc8ee699432b7a3096b93136576d68..5581a8045ede0e97f4cb138d4a8259d57596aa2d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -1536,6 +1536,8 @@ void mlx5e_tc_update_neigh_used_value(struct mlx5e_neigh_hash_entry *nhe)
                }
        }
 
+       trace_mlx5e_tc_update_neigh_used_value(nhe, neigh_used);
+
        if (neigh_used) {
                nhe->reported_lastuse = jiffies;