From 61c0ddbe97721d69ace947d1afa956b7646bcdc9 Mon Sep 17 00:00:00 2001 From: Moni Shoua Date: Sun, 16 Apr 2017 07:31:34 +0300 Subject: [PATCH] IB/cma: Send MRA for reply messages Current implementation of RDMA_CM sends MRA (Message Receipt Acknowledgment) only for request messages but not for response messages. As a result, a slow active side of the connection may send a ready-to-use message to the passive side in a delay that is too long for the passive side to wait for. This patch adds a call to ib_send_cm_mra() upon receiving a response message and by this tells the other side to modify the service timeout to a bigger value, 16 times than before. As in the request case, MRA for reply will be sent only if a duplicate response has arrived. Signed-off-by: Moni Shoua Reviewed-by: Matan Barak Signed-off-by: Leon Romanovsky Signed-off-by: Doug Ledford --- drivers/infiniband/core/cma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index acd10d6..c1a90f0 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -1755,6 +1755,9 @@ static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) event.status = -ETIMEDOUT; break; case IB_CM_REP_RECEIVED: + if (cma_comp(id_priv, RDMA_CM_CONNECT) && + (id_priv->id.qp_type != IB_QPT_UD)) + ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0); if (id_priv->id.qp) { event.status = cma_rep_recv(id_priv); event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR : -- 2.7.4