RDMA/cma: Add RDMA_CM_EVENT_TIMEWAIT_EXIT event

Consumers that want to re-use their QPs in new connections need to
know when the QP has exited the timewait state.  Report the timewait
event through the rdma_cm.

Signed-off-by: Amir Vadai <amirv@mellanox.co.il>
Acked-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 79792c9..e980ff3 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -920,7 +920,10 @@ static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
        struct rdma_cm_event event;
        int ret = 0;
 
-       if (cma_disable_callback(id_priv, CMA_CONNECT))
+       if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
+               cma_disable_callback(id_priv, CMA_CONNECT)) ||
+           (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
+               cma_disable_callback(id_priv, CMA_DISCONNECT)))
                return 0;
 
        memset(&event, 0, sizeof event);
@@ -956,6 +959,8 @@ static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
                event.event = RDMA_CM_EVENT_DISCONNECTED;
                break;
        case IB_CM_TIMEWAIT_EXIT:
+               event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
+               break;
        case IB_CM_MRA_RECEIVED:
                /* ignore event */
                goto out;

diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h
index 001d606..df7faf0 100644 (file)
--- a/include/rdma/rdma_cm.h
+++ b/include/rdma/rdma_cm.h
@@ -58,7 +58,8 @@ enum rdma_cm_event_type {
        RDMA_CM_EVENT_DEVICE_REMOVAL,
        RDMA_CM_EVENT_MULTICAST_JOIN,
        RDMA_CM_EVENT_MULTICAST_ERROR,
-       RDMA_CM_EVENT_ADDR_CHANGE
+       RDMA_CM_EVENT_ADDR_CHANGE,
+       RDMA_CM_EVENT_TIMEWAIT_EXIT
 };
 
 enum rdma_port_space {