diff options
| author | Steve Wise <swise@opengridcomputing.com> | 2010-05-20 16:57:49 -0500 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2010-05-24 21:08:01 -0700 |
| commit | 7ec45b923446d484eb39434e18d354666426e606 (patch) | |
| tree | 9f303610291ed6a855c6af84444909f2315f08b9 /drivers | |
| parent | 84172dee05cbce6ae791eac481ef4d8590cda791 (diff) | |
| download | linux-7ec45b923446d484eb39434e18d354666426e606.tar.bz2 | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/hw/cxgb4/t4.h | 31 |
1 files changed, 12 insertions, 19 deletions
diff --git a/drivers/infiniband/hw/cxgb4/t4.h b/drivers/infiniband/hw/cxgb4/t4.h index 712bc5620d3e..333abd3c7264 100644 --- a/drivers/infiniband/hw/cxgb4/t4.h +++ b/drivers/infiniband/hw/cxgb4/t4.h @@ -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; |