IB/ipath: Limit # of packets sent without an ACK received

The sender requests an ACK every 1/2 MB to avoid retransmit timeouts that
were causing MVAPICH mod_bw to fail after a predictable number of sends.

Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_qp.c b/drivers/infiniband/hw/ipath/ipath_qp.c
index 224b0f40767f..ecfaca7a571b 100644
--- a/drivers/infiniband/hw/ipath/ipath_qp.c
+++ b/drivers/infiniband/hw/ipath/ipath_qp.c
@@ -342,6 +342,7 @@ static void ipath_reset_qp(struct ipath_qp *qp)
         qp->s_last = 0;
         qp->s_ssn = 1;
         qp->s_lsn = 0;
+        qp->s_wait_credit = 0;
         if (qp->r_rq.wq) {
                 qp->r_rq.wq->head = 0;
                 qp->r_rq.wq->tail = 0;
@@ -516,7 +517,7 @@ int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
                 qp->remote_qpn = attr->dest_qp_num;
 
         if (attr_mask & IB_QP_SQ_PSN) {
-                qp->s_next_psn = attr->sq_psn;
+                qp->s_psn = qp->s_next_psn = attr->sq_psn;
                 qp->s_last_psn = qp->s_next_psn - 1;
         }