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RDMA/bnxt_re: Fix RQE posting logic 

This patch adds code to ring RQ Doorbell aggressively
so that the adapter can DMA RQ buffers sooner, instead
of DMA all WQEs in the post_recv WR list together at the
end of the post_recv verb.
Also use spinlock to serialize RQ posting

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Devesh Sharma 2017-05-22 03:15:40 -07:00 committed by Doug Ledford
parent 3fb755b3d5
commit 018cf5995d
3 changed files with 20 additions and 1 deletions
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2
drivers/infiniband/hw/bnxt_re/bnxt_re.h
View File

@ -58,6 +58,8 @@
#define BNXT_RE_UD_QP_HW_STALL 0x400000
#define BNXT_RE_RQ_WQE_THRESHOLD 32
struct bnxt_re_work {
struct work_struct work;
unsigned long event;

18
drivers/infiniband/hw/bnxt_re/ib_verbs.c
View File

@ -1249,6 +1249,7 @@ struct ib_qp *bnxt_re_create_qp(struct ib_pd *ib_pd,
qp->ib_qp.qp_num = qp->qplib_qp.id;
spin_lock_init(&qp->sq_lock);
spin_lock_init(&qp->rq_lock);
if (udata) {
struct bnxt_re_qp_resp resp;
@ -2281,7 +2282,10 @@ int bnxt_re_post_recv(struct ib_qp *ib_qp, struct ib_recv_wr *wr,
struct bnxt_re_qp *qp = container_of(ib_qp, struct bnxt_re_qp, ib_qp);
struct bnxt_qplib_swqe wqe;
int rc = 0, payload_sz = 0;
unsigned long flags;
u32 count = 0;
spin_lock_irqsave(&qp->rq_lock, flags);
while (wr) {
/* House keeping */
memset(&wqe, 0, sizeof(wqe));
@ -2310,9 +2314,21 @@ int bnxt_re_post_recv(struct ib_qp *ib_qp, struct ib_recv_wr *wr,
*bad_wr = wr;
break;
}
/* Ring DB if the RQEs posted reaches a threshold value */
if (++count >= BNXT_RE_RQ_WQE_THRESHOLD) {
bnxt_qplib_post_recv_db(&qp->qplib_qp);
count = 0;
}
wr = wr->next;
}
bnxt_qplib_post_recv_db(&qp->qplib_qp);
if (count)
bnxt_qplib_post_recv_db(&qp->qplib_qp);
spin_unlock_irqrestore(&qp->rq_lock, flags);
return rc;
}

1
drivers/infiniband/hw/bnxt_re/ib_verbs.h
View File

@ -74,6 +74,7 @@ struct bnxt_re_qp {
struct bnxt_re_dev *rdev;
struct ib_qp ib_qp;
spinlock_t sq_lock; /* protect sq */
spinlock_t rq_lock; /* protect rq */
struct bnxt_qplib_qp qplib_qp;
struct ib_umem *sumem;
struct ib_umem *rumem;