RDMA/cxgb4: Always do GTS write if cidx_inc == CIDXINC_MASK
authorSteve Wise <swise@opengridcomputing.com>
Tue, 6 Aug 2013 15:34:38 +0000 (21:04 +0530)
committerRoland Dreier <roland@purestorage.com>
Tue, 13 Aug 2013 18:55:47 +0000 (11:55 -0700)
When polling, we do a GTS update if the accumulated cidx_inc == the CQ
depth / 16.  However, if the CQ is large enough, Cq depth / 16 exceeds
the size of the field in the GTS word.  So we also need to update if
cidx_inc hits CIDXINC_MASK to avoid overflowing the field.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Vipul Pandya <vipul@chelsio.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
drivers/infiniband/hw/cxgb4/t4.h

index 3a6a289..1272dfe 100644 (file)
@@ -531,7 +531,7 @@ 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 >> 4)) {
+       if (++cq->cidx_inc == (cq->size >> 4) || cq->cidx_inc == CIDXINC_MASK) {
                u32 val;
 
                val = SEINTARM(0) | CIDXINC(cq->cidx_inc) | TIMERREG(7) |