IB/cm: Fix automatic path migration support

The ib_cm_establish() function is replaced with a more generic
ib_cm_notify().  This routine is used to notify the CM that failover
has occurred, so that future CM messages (LAP, DREQ) reach the remote
CM.  (Currently, we continue to use the original path)  This bumps the
userspace CM ABI.

New alternate path information is captured when a LAP message is sent
or received.  This allows QP attributes to be initialized for the user
when a new path is loaded after failover occurs.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/rdma/ib_user_cm.h b/include/rdma/ib_user_cm.h
index 066c20b7cdfb..37650afb982c 100644
--- a/include/rdma/ib_user_cm.h
+++ b/include/rdma/ib_user_cm.h
@@ -38,7 +38,7 @@
 
 #include <rdma/ib_user_sa.h>
 
-#define IB_USER_CM_ABI_VERSION 4
+#define IB_USER_CM_ABI_VERSION 5
 
 enum {
         IB_USER_CM_CMD_CREATE_ID,
@@ -46,7 +46,7 @@ enum {
         IB_USER_CM_CMD_ATTR_ID,
 
         IB_USER_CM_CMD_LISTEN,
-        IB_USER_CM_CMD_ESTABLISH,
+        IB_USER_CM_CMD_NOTIFY,
 
         IB_USER_CM_CMD_SEND_REQ,
         IB_USER_CM_CMD_SEND_REP,
@@ -117,8 +117,9 @@ struct ib_ucm_listen {
         __u32 reserved;
 };
 
-struct ib_ucm_establish {
+struct ib_ucm_notify {
         __u32 id;
+        __u32 event;
 };
 
 struct ib_ucm_private_data {