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RDMA/cxgb4: Fix overflow bug in CQ arm 

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

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Steve Wise 2010-05-20 16:57:49 -05:00 committed by Roland Dreier
parent 84172dee05
commit 7ec45b9234
1 changed files with 11 additions and 18 deletions
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29
drivers/infiniband/hw/cxgb4/t4.h
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@ -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) |
INGRESSQID(cq->cqid);
else
val = SEINTARM(0) | CIDXINC(inc) | TIMERREG(7) |
INGRESSQID(cq->cqid);
cq->cidx_inc -= inc;
while (cq->cidx_inc > CIDXINC_MASK) {
val = SEINTARM(0) | CIDXINC(CIDXINC_MASK) | TIMERREG(7) |
INGRESSQID(cq->cqid);
writel(val, cq->gts);
} while (cq->cidx_inc);
cq->cidx_inc -= CIDXINC_MASK;
}
val = SEINTARM(se) | CIDXINC(cq->cidx_inc) | TIMERREG(6) |
INGRESSQID(cq->cqid);
writel(val, cq->gts);
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;