RDMA/rtrs-srv: Add event tracing support

Add event tracing mechanism for following routines:
- send_io_resp_imm()

How to use:
1. Load the rtrs_server module
2. cd /sys/kernel/debug/tracing
3. If all the events need to be enabled:
        echo 1 > events/rtrs_srv/enable
4. OR only speific routine/event needs to be enabled e.g.
        echo 1 > events/rtrs_srv/send_io_resp_imm/enable
5. cat trace
6. Run some I/O workload which can trigger send_io_resp_imm()

Link: https://lore.kernel.org/r/20220818105240.110234-3-haris.iqbal@ionos.com
Signed-off-by: Santosh Pradhan <santosh.pradhan@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Md Haris Iqbal <haris.iqbal@ionos.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv.c b/drivers/infiniband/ulp/rtrs/rtrs-srv.c
index 34c03bde5064..22e6f991946c 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-srv.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-srv.c
@@ -16,6 +16,7 @@
 #include "rtrs-log.h"
 #include <rdma/ib_cm.h>
 #include <rdma/ib_verbs.h>
+#include "rtrs-srv-trace.h"
 
 MODULE_DESCRIPTION("RDMA Transport Server");
 MODULE_LICENSE("GPL");
@@ -57,11 +58,6 @@ static inline struct rtrs_srv_con *to_srv_con(struct rtrs_con *c)
 	return container_of(c, struct rtrs_srv_con, c);
 }
 
-static inline struct rtrs_srv_path *to_srv_path(struct rtrs_path *s)
-{
-	return container_of(s, struct rtrs_srv_path, s);
-}
-
 static bool rtrs_srv_change_state(struct rtrs_srv_path *srv_path,
 				  enum rtrs_srv_state new_state)
 {
@@ -375,6 +371,8 @@ static int send_io_resp_imm(struct rtrs_srv_con *con, struct rtrs_srv_op *id,
 		}
 	}
 
+	trace_send_io_resp_imm(id, need_inval, always_invalidate, errno);
+
 	if (need_inval && always_invalidate) {
 		wr = &inv_wr;
 		inv_wr.next = &rwr.wr;