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Commit 7ec45b92 authored by Steve Wise's avatar Steve Wise Committed by Roland Dreier
Browse files

RDMA/cxgb4: Fix overflow bug in CQ arm 



- wrap cq->cqidx_inc based on cq size.
- optimize t4_arm_cq logic.

Signed-off-by: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 84172dee

drivers/infiniband/hw/cxgb4/t4.h

+12 −19
Original line number Diff line number Diff line
@@ -449,25 +449,17 @@ struct t4_cq { 
static inline int t4_arm_cq(struct t4_cq *cq, int se)

{

	u32 val;

	u16 inc;



	do {

		/*

		 * inc must be less the both the max update value -and-

		 * the size of the CQ.

		 */

		inc = cq->cidx_inc <= CIDXINC_MASK ? cq->cidx_inc :

						     CIDXINC_MASK;

		inc = inc <= (cq->size - 1) ? inc : (cq->size - 1);

		if (inc == cq->cidx_inc)

			val = SEINTARM(se) | CIDXINC(inc) | TIMERREG(6) |

	while (cq->cidx_inc > CIDXINC_MASK) {

		val = SEINTARM(0) | CIDXINC(CIDXINC_MASK) | TIMERREG(7) |

		      INGRESSQID(cq->cqid);

		else

			val = SEINTARM(0) | CIDXINC(inc) | TIMERREG(7) |

		writel(val, cq->gts);

		cq->cidx_inc -= CIDXINC_MASK;

	}

	val = SEINTARM(se) | CIDXINC(cq->cidx_inc) | TIMERREG(6) |

	      INGRESSQID(cq->cqid);

		cq->cidx_inc -= inc;

	writel(val, cq->gts);

	} while (cq->cidx_inc);

	cq->cidx_inc = 0;

	return 0;

}
@@ -488,7 +480,8 @@ 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;

	cq->cidx_inc++;

	if (++cq->cidx_inc == cq->size)

		cq->cidx_inc = 0;

	if (++cq->cidx == cq->size) {

		cq->cidx = 0;

		cq->gen ^= 1;