IB/ipath: Generate flush CQE when QP is in error state

Follow the IB spec. (C10-96) for post send which states that a flushed
completion event should be generated for work requests posted when a QP
is in the error state.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index 3cc82b6..495194b 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -230,6 +230,18 @@ void ipath_skip_sge(struct ipath_sge_state *ss, u32 length)
        }
 }
 
+static void ipath_flush_wqe(struct ipath_qp *qp, struct ib_send_wr *wr)
+{
+       struct ib_wc wc;
+
+       memset(&wc, 0, sizeof(wc));
+       wc.wr_id = wr->wr_id;
+       wc.status = IB_WC_WR_FLUSH_ERR;
+       wc.opcode = ib_ipath_wc_opcode[wr->opcode];
+       wc.qp = &qp->ibqp;
+       ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 1);
+}
+
 /**
  * ipath_post_one_send - post one RC, UC, or UD send work request
  * @qp: the QP to post on
@@ -248,8 +260,14 @@ static int ipath_post_one_send(struct ipath_qp *qp, struct ib_send_wr *wr)
        spin_lock_irqsave(&qp->s_lock, flags);
 
        /* Check that state is OK to post send. */
-       if (!(ib_ipath_state_ops[qp->state] & IPATH_POST_SEND_OK))
-               goto bail_inval;
+       if (unlikely(!(ib_ipath_state_ops[qp->state] & IPATH_POST_SEND_OK))) {
+               if (qp->state != IB_QPS_SQE && qp->state != IB_QPS_ERR)
+                       goto bail_inval;
+               /* C10-96 says generate a flushed completion entry. */
+               ipath_flush_wqe(qp, wr);
+               ret = 0;
+               goto bail;
+       }
 
        /* IB spec says that num_sge == 0 is OK. */
        if (wr->num_sge > qp->s_max_sge)