Commit ae57e24a authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Roland Dreier

[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: default avatarMichael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 64044bcf
......@@ -1707,6 +1707,7 @@ int mthca_tavor_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
{
struct mthca_dev *dev = to_mdev(ibqp->device);
struct mthca_qp *qp = to_mqp(ibqp);
__be32 doorbell[2];
unsigned long flags;
int err = 0;
int nreq;
......@@ -1724,6 +1725,22 @@ 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;
}
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,
......@@ -1781,8 +1798,6 @@ int mthca_tavor_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
out:
if (likely(nreq)) {
__be32 doorbell[2];
doorbell[0] = cpu_to_be32((qp->rq.next_ind << qp->rq.wqe_shift) | size0);
doorbell[1] = cpu_to_be32((qp->qpn << 8) | nreq);
......
......@@ -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);
......
......@@ -49,7 +49,8 @@ enum {
};
enum {
MTHCA_INVAL_LKEY = 0x100
MTHCA_INVAL_LKEY = 0x100,
MTHCA_TAVOR_MAX_WQES_PER_RECV_DB = 256
};
struct mthca_next_seg {
......
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