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[IB] mthca: fix posting long lists of receive work requests

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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>
This commit is contained in:
Michael S. Tsirkin
2005-11-09 14:59:57 -08:00
committed by Roland Dreier
parent 64044bcf75
commit ae57e24a40
3 changed files with 39 additions and 5 deletions
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22
drivers/infiniband/hw/mthca/mthca_srq.c
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@@ -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);