There are 2 limits that need to be taken into account when arming the CQ.
1) the GTS register limits the delta idx to <= 0xfff.
2) T4 HW limits it to < cq size.
Update t4_arm_cq() to account for these limits.
Signed-off-by: Steve Wise <sw...@opengridcomputing.com>
---
drivers/infiniband/hw/cxgb4/t4.h | 24 +++++++++++++++++++-----
1 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/drivers/infiniband/hw/cxgb4/t4.h b/drivers/infiniband/hw/cxgb4/t4.h
index aeeb005..7f04dc5 100644
--- a/drivers/infiniband/hw/cxgb4/t4.h
+++ b/drivers/infiniband/hw/cxgb4/t4.h
@@ -449,11 +449,25 @@ struct t4_cq {
static inline int t4_arm_cq(struct t4_cq *cq, int se)
{
u32 val;
-
- val = SEINTARM(se) | CIDXINC(cq->cidx_inc) | TIMERREG(6) |
- INGRESSQID(cq->cqid);
- cq->cidx_inc = 0;
- writel(val, cq->gts);
+ 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;
+ writel(val, cq->gts);
+ } while (cq->cidx_inc);
return 0;
}
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