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IB/mlx4: Correct max_srq_wr returned from mlx4_ib_query_device()

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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>
This commit is contained in:
Jack Morgenstein 2007-06-21 13:39:10 -07:00 committed by Roland Dreier
parent 13ef5f44c3
commit c8681f1401
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/hw/mlx4/main.c
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@ -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 ?