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authorMichael S. Tsirkin <mst@mellanox.co.il>2005-11-09 14:59:57 -0800
committerRoland Dreier <rolandd@cisco.com>2005-11-10 10:22:51 -0800
commitae57e24a4006fd46b73d842ee99db9580ef74a02 (patch)
tree17115437026be55dcd74641be21561fecf33dcdb /drivers/infiniband/hw/mthca/mthca_srq.c
parent64044bcf75063cb5a6d42712886a712449df2ce3 (diff)
[IB] mthca: fix posting long lists of receive work requests
In Tavor mode, when posting a long list of receive work requests, a doorbell must be rung every 256 requests. Add code to do this when required. Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/mthca/mthca_srq.c')
-rw-r--r--drivers/infiniband/hw/mthca/mthca_srq.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 292f55be8cb..c3c0331a1f6 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -414,6 +414,7 @@ int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
{
struct mthca_dev *dev = to_mdev(ibsrq->device);
struct mthca_srq *srq = to_msrq(ibsrq);
+ __be32 doorbell[2];
unsigned long flags;
int err = 0;
int first_ind;
@@ -429,6 +430,25 @@ int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
first_ind = srq->first_free;
for (nreq = 0; wr; ++nreq, wr = wr->next) {
+ if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
+ nreq = 0;
+
+ doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
+ doorbell[1] = cpu_to_be32(srq->srqn << 8);
+
+ /*
+ * Make sure that descriptors are written
+ * before doorbell is rung.
+ */
+ wmb();
+
+ mthca_write64(doorbell,
+ dev->kar + MTHCA_RECEIVE_DOORBELL,
+ MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
+
+ first_ind = srq->first_free;
+ }
+
ind = srq->first_free;
if (ind < 0) {
@@ -491,8 +511,6 @@ int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
}
if (likely(nreq)) {
- __be32 doorbell[2];
-
doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift);
doorbell[1] = cpu_to_be32((srq->srqn << 8) | nreq);