IB/mthca: Check that SRQ WQE size does not exceed device's max value
Guarantee the calculated work queue entry size does not exceed the max
allowable WQE size when creating an SRQ. This is a problem with Arbel
in Tavor-compatibility mode because the current WQE size computation
method rounds up to next power of 2.
Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 47a6a75..4e671e0 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -205,6 +205,10 @@
ds = max(64UL,
roundup_pow_of_two(sizeof (struct mthca_next_seg) +
srq->max_gs * sizeof (struct mthca_data_seg)));
+
+ if (ds > dev->limits.max_desc_sz)
+ return -EINVAL;
+
srq->wqe_shift = long_log2(ds);
srq->srqn = mthca_alloc(&dev->srq_table.alloc);