iw_cxgb4: only insert drain cqes if wq is flushed

Only insert our special drain CQEs to support ib_drain_sq/rq() after
the wq is flushed. Otherwise, existing but not yet polled CQEs can be
returned out of order to the user application.  This can happen when the
QP has exited RTS but not yet flushed the QP, which can happen during
a normal close (vs abortive close).

In addition never count the drain CQEs when determining how many CQEs
need to be synthesized during the flush operation.  This latter issue
should never happen if the QP is properly flushed before inserting the
drain CQE, but I wanted to avoid corrupting the CQ state.  So we handle
it and log a warning once.

Fixes: 4fe7c2962e11 ("iw_cxgb4: refactor sq/rq drain logic")
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c
index ea55e95cd2c5df33bf9de567eb685fae3cbaea1c..b7bfc536e00fd8c7b241c0f56539d1394d235acf 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/cq.c
+++ b/drivers/infiniband/hw/cxgb4/cq.c
@@ -395,6 +395,11 @@ next_cqe:
 
 static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq)
 {
+       if (CQE_OPCODE(cqe) == C4IW_DRAIN_OPCODE) {
+               WARN_ONCE(1, "Unexpected DRAIN CQE qp id %u!\n", wq->sq.qid);
+               return 0;
+       }
+
        if (CQE_OPCODE(cqe) == FW_RI_TERMINATE)
                return 0;
 

diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index 355e288ec969bf2c7a395dc3634de3077feac425..38bddd02a9437470e0f3ed98a7e55afbc8cc7384 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -868,7 +868,12 @@ int c4iw_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 
        qhp = to_c4iw_qp(ibqp);
        spin_lock_irqsave(&qhp->lock, flag);
-       if (t4_wq_in_error(&qhp->wq)) {
+
+       /*
+        * If the qp has been flushed, then just insert a special
+        * drain cqe.
+        */
+       if (qhp->wq.flushed) {
                spin_unlock_irqrestore(&qhp->lock, flag);
                complete_sq_drain_wr(qhp, wr);
                return err;
@@ -1011,7 +1016,12 @@ int c4iw_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 
        qhp = to_c4iw_qp(ibqp);
        spin_lock_irqsave(&qhp->lock, flag);
-       if (t4_wq_in_error(&qhp->wq)) {
+
+       /*
+        * If the qp has been flushed, then just insert a special
+        * drain cqe.
+        */
+       if (qhp->wq.flushed) {
                spin_unlock_irqrestore(&qhp->lock, flag);
                complete_rq_drain_wr(qhp, wr);
                return err;