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IB/mthca: Fix posting lists of 256 receive requests for Tavor 

If we post a list of length 256 exactly, nreq in doorbell gets set to
256 which is wrong: it should be encoded by 0.  This is because we
only zero it out on the next WR, which may not be there.  The solution
is to ring the doorbell after posting a WQE, not before posting the
next one.

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 2006-05-18 18:32:54 +03:00 committed by Roland Dreier
parent 0cb4fe8d26
commit 23f3bc0f2c
1 changed files with 18 additions and 17 deletions
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35
drivers/infiniband/hw/mthca/mthca_qp.c
View File

@ -1727,23 +1727,7 @@ int mthca_tavor_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
ind = qp->rq.next_ind;
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((qp->rq.next_ind << qp->rq.wqe_shift) | size0);
doorbell[1] = cpu_to_be32(qp->qpn << 8);
wmb();
mthca_write64(doorbell,
dev->kar + MTHCA_RECEIVE_DOORBELL,
MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
qp->rq.head += MTHCA_TAVOR_MAX_WQES_PER_RECV_DB;
size0 = 0;
}
for (nreq = 0; wr; wr = wr->next) {
if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
mthca_err(dev, "RQ %06x full (%u head, %u tail,"
" %d max, %d nreq)\n", qp->qpn,
@ -1797,6 +1781,23 @@ int mthca_tavor_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
++ind;
if (unlikely(ind >= qp->rq.max))
ind -= qp->rq.max;
++nreq;
if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
nreq = 0;
doorbell[0] = cpu_to_be32((qp->rq.next_ind << qp->rq.wqe_shift) | size0);
doorbell[1] = cpu_to_be32(qp->qpn << 8);
wmb();
mthca_write64(doorbell,
dev->kar + MTHCA_RECEIVE_DOORBELL,
MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
qp->rq.head += MTHCA_TAVOR_MAX_WQES_PER_RECV_DB;
size0 = 0;
}
}
out: