[IB] mthca: detect SRQ overflow

The hardware relies on us keeping one extra work request that never
gets used in SRQs.  Add checks to the SRQ work request posting
functions so that they fail when someone is about to use up that extra
work request, rather than when someone uses the very last work request.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 13d2290261d9..e464321a7aa7 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -438,6 +438,14 @@ int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 
                 wqe       = get_wqe(srq, ind);
                 next_ind  = *wqe_to_link(wqe);
+
+                if (next_ind < 0) {
+                        mthca_err(dev, "SRQ %06x full\n", srq->srqn);
+                        err = -ENOMEM;
+                        *bad_wr = wr;
+                        break;
+                }
+
                 prev_wqe  = srq->last;
                 srq->last = wqe;
 
@@ -529,6 +537,13 @@ int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
                 wqe       = get_wqe(srq, ind);
                 next_ind  = *wqe_to_link(wqe);
 
+                if (next_ind < 0) {
+                        mthca_err(dev, "SRQ %06x full\n", srq->srqn);
+                        err = -ENOMEM;
+                        *bad_wr = wr;
+                        break;
+                }
+
                 ((struct mthca_next_seg *) wqe)->nda_op =
                         cpu_to_be32((next_ind << srq->wqe_shift) | 1);
                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;