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| author | Steve Wise <swise@opengridcomputing.com> | 2011-06-01 17:49:14 +0000 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2011-06-17 11:52:45 -0700 |
| commit | 2ff7d09a1b0f20f2d9c1bde0e003d4e384de2313 (patch) | |
| tree | 9eb1621a6806950d89496c5dde9ff36b6ae90b71 /drivers/infiniband | |
| parent | 2c53b436a30867eb6b47dd7bab23ba638d1fb0d2 (diff) | |
| download | lwn-2ff7d09a1b0f20f2d9c1bde0e003d4e384de2313.tar.gz lwn-2ff7d09a1b0f20f2d9c1bde0e003d4e384de2313.zip | |
RDMA/cxgb4: Don't exceed hw IQ depth limit for user CQs
Memory allocated for user CQs gets rounded up to the next page
boundary. And after rounding, we recalculate the resulting IQ depth
and we need to make sure we don't exceed the HW limits.
This bug can result a much smaller CQ allocated than was expected if
the HW size field is exceeded, resulting in CQ overflow failures.
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/cxgb4/cq.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c index 8d8f8add6fcd..1720dc790d13 100644 --- a/drivers/infiniband/hw/cxgb4/cq.c +++ b/drivers/infiniband/hw/cxgb4/cq.c @@ -801,6 +801,10 @@ struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries, if (ucontext) { memsize = roundup(memsize, PAGE_SIZE); hwentries = memsize / sizeof *chp->cq.queue; + while (hwentries > T4_MAX_IQ_SIZE) { + memsize -= PAGE_SIZE; + hwentries = memsize / sizeof *chp->cq.queue; + } } chp->cq.size = hwentries; chp->cq.memsize = memsize; |