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>

diff --git a/drivers/infiniband/hw/cxgb4/t4.h b/drivers/infiniband/hw/cxgb4/t4.h
index 70004425d695b0d765a3305406dc3ac5c0970d44..24af12fc8228465c155e4cfc2f5aa55fcf2631d5 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/t4.h
+++ b/drivers/infiniband/hw/cxgb4/t4.h
@@ -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;