RDMA/irdma: Report the correct max cqes from query device

[ Upstream commit 12faad5e5cf2372af2d51f348b697b5edf838daf ]

Report the correct max cqes available to an application taking
into account a reserved entry to detect overflow.

Fixes: b48c24c2d710 ("RDMA/irdma: Implement device supported verb APIs")
Signed-off-by: Sindhu-Devale <sindhu.devale@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Link: https://lore.kernel.org/r/20220906223244.1119-2-shiraz.saleem@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c
index cac4fb228b9b0236e7a947980cb23f15803daf69..adb0e0774256c31296f436817f76cc6cada82f19 100644 (file)
--- a/drivers/infiniband/hw/irdma/verbs.c
+++ b/drivers/infiniband/hw/irdma/verbs.c
@@ -36,7 +36,7 @@ static int irdma_query_device(struct ib_device *ibdev,
        props->max_send_sge = hw_attrs->uk_attrs.max_hw_wq_frags;
        props->max_recv_sge = hw_attrs->uk_attrs.max_hw_wq_frags;
        props->max_cq = rf->max_cq - rf->used_cqs;
-       props->max_cqe = rf->max_cqe;
+       props->max_cqe = rf->max_cqe - 1;
        props->max_mr = rf->max_mr - rf->used_mrs;
        props->max_mw = props->max_mr;
        props->max_pd = rf->max_pd - rf->used_pds;