RDS/IB: print IB event strings as well as their number

It's nice to not have to go digging in the code to see which event
occurred.  It's easy to throw together a quick array that maps the ib
event enums to their strings.  I didn't see anything in the stack that
does this translation for us, but I also didn't look very hard.

Signed-off-by: Zach Brown <zach.brown@oracle.com>

1 files changed, 39 insertions, 4 deletions

diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
index 123c7d33b54e..0e2fea893a76 100644
--- a/net/rds/ib_cm.c
+++ b/net/rds/ib_cm.c
@@ -38,6 +38,38 @@
 #include "rds.h"
 #include "ib.h"
 
+static char *rds_ib_event_type_strings[] = {
+#define RDS_IB_EVENT_STRING(foo) [IB_EVENT_##foo] = __stringify(foo)
+        RDS_IB_EVENT_STRING(CQ_ERR),
+        RDS_IB_EVENT_STRING(QP_FATAL),
+        RDS_IB_EVENT_STRING(QP_REQ_ERR),
+        RDS_IB_EVENT_STRING(QP_ACCESS_ERR),
+        RDS_IB_EVENT_STRING(COMM_EST),
+        RDS_IB_EVENT_STRING(SQ_DRAINED),
+        RDS_IB_EVENT_STRING(PATH_MIG),
+        RDS_IB_EVENT_STRING(PATH_MIG_ERR),
+        RDS_IB_EVENT_STRING(DEVICE_FATAL),
+        RDS_IB_EVENT_STRING(PORT_ACTIVE),
+        RDS_IB_EVENT_STRING(PORT_ERR),
+        RDS_IB_EVENT_STRING(LID_CHANGE),
+        RDS_IB_EVENT_STRING(PKEY_CHANGE),
+        RDS_IB_EVENT_STRING(SM_CHANGE),
+        RDS_IB_EVENT_STRING(SRQ_ERR),
+        RDS_IB_EVENT_STRING(SRQ_LIMIT_REACHED),
+        RDS_IB_EVENT_STRING(QP_LAST_WQE_REACHED),
+        RDS_IB_EVENT_STRING(CLIENT_REREGISTER),
+#undef RDS_IB_EVENT_STRING
+};
+
+static char *rds_ib_event_str(enum ib_event_type type)
+{
+        if (type < ARRAY_SIZE(rds_ib_event_type_strings) &&
+            rds_ib_event_type_strings[type])
+                return rds_ib_event_type_strings[type];
+        else
+                return "unknown";
+};
+
 /*
  * Set the selected protocol version
  */
@@ -202,7 +234,8 @@ static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
 
 static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
 {
-        rdsdebug("event %u data %p\n", event->event, data);
+        rdsdebug("event %u (%s) data %p\n",
+                 event->event, rds_ib_event_str(event->event), data);
 }
 
 static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
@@ -210,16 +243,18 @@ static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
         struct rds_connection *conn = data;
         struct rds_ib_connection *ic = conn->c_transport_data;
 
-        rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
+        rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
+                 rds_ib_event_str(event->event));
 
         switch (event->event) {
         case IB_EVENT_COMM_EST:
                 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
                 break;
         default:
-                rdsdebug("Fatal QP Event %u "
+                rdsdebug("Fatal QP Event %u (%s) "
                         "- connection %pI4->%pI4, reconnecting\n",
-                        event->event, &conn->c_laddr, &conn->c_faddr);
+                        event->event, rds_ib_event_str(event->event),
+                        &conn->c_laddr, &conn->c_faddr);
                 rds_conn_drop(conn);
                 break;
         }