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RDMA/cxgb4: Do CIDX_INC updates every 1/16 CQ depth CQE reaps 

This avoids the CIDX_INC overflow issue with T4A2 when running
kernel RDMA applications.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Steve Wise 2011-03-11 22:30:42 +00:00 committed by Roland Dreier
parent 2942813739
commit ffc3f7487f
1 changed files with 7 additions and 1 deletions
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8
drivers/infiniband/hw/cxgb4/t4.h
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@ -507,8 +507,14 @@ static inline void t4_swcq_consume(struct t4_cq *cq)
static inline void t4_hwcq_consume(struct t4_cq *cq)
{
cq->bits_type_ts = cq->queue[cq->cidx].bits_type_ts;
if (++cq->cidx_inc == cq->size)
if (++cq->cidx_inc == (cq->size >> 4)) {
u32 val;
val = SEINTARM(0) | CIDXINC(cq->cidx_inc) | TIMERREG(7) |
INGRESSQID(cq->cqid);
writel(val, cq->gts);
cq->cidx_inc = 0;
}
if (++cq->cidx == cq->size) {
cq->cidx = 0;
cq->gen ^= 1;