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authorJack Morgenstein <jackm@dev.mellanox.co.il>2007-06-21 13:39:10 -0700
committerRoland Dreier <rolandd@cisco.com>2007-06-21 13:39:10 -0700
commitc8681f14013d3ad2fc4fb4e30cfd4ea548f7a249 (patch)
tree4ea047565dcc3340dcd473fca5579a5cb2de349a
parent13ef5f44c3931dff1d75443a875e97b588d4b8f0 (diff)
IB/mlx4: Correct max_srq_wr returned from mlx4_ib_query_device()
We need to keep a spare entry in the SRQ so that there always is a next WQE available when posting receives (so that we can tell the difference between a full queue and an empty queue). So subtract 1 from the value HW gives us before reporting the limit on SRQ entries to consumers. Found by Mellanox QA. Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
-rw-r--r--drivers/infiniband/hw/mlx4/main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 1095c82b38c..c591616dccd 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -120,7 +120,7 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
props->max_qp_init_rd_atom = dev->dev->caps.max_qp_init_rdma;
props->max_res_rd_atom = props->max_qp_rd_atom * props->max_qp;
props->max_srq = dev->dev->caps.num_srqs - dev->dev->caps.reserved_srqs;
- props->max_srq_wr = dev->dev->caps.max_srq_wqes;
+ props->max_srq_wr = dev->dev->caps.max_srq_wqes - 1;
props->max_srq_sge = dev->dev->caps.max_srq_sge;
props->local_ca_ack_delay = dev->dev->caps.local_ca_ack_delay;
props->atomic_cap = dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_ATOMIC ?