IB/mlx5: Exposing modify CQ callback to uverbs layer

Exposed mlx5_ib_modify_cq to be called from ib device
verb list.
Signed-off-by: Yonatan Cohen <yonatanc@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/cq.c

@@ -1149,6 +1149,9 @@ int mlx5_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
 	if (!MLX5_CAP_GEN(dev->mdev, cq_moderation))
 		return -ENOSYS;
 
+	if (cq_period > MLX5_MAX_CQ_PERIOD)
+		return -EINVAL;
+
 	err = mlx5_core_modify_cq_moderation(dev->mdev, &mcq->mcq,
 					     cq_period, cq_count);
 	if (err)

drivers/infiniband/hw/mlx5/main.c

@@ -4022,7 +4022,8 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
 		(1ull << IB_USER_VERBS_EX_CMD_QUERY_DEVICE)	|
 		(1ull << IB_USER_VERBS_EX_CMD_CREATE_CQ)	|
 		(1ull << IB_USER_VERBS_EX_CMD_CREATE_QP)	|
-		(1ull << IB_USER_VERBS_EX_CMD_MODIFY_QP);
+		(1ull << IB_USER_VERBS_EX_CMD_MODIFY_QP)	|
+		(1ull << IB_USER_VERBS_EX_CMD_MODIFY_CQ);
 
 	dev->ib_dev.query_device	= mlx5_ib_query_device;
 	dev->ib_dev.query_port		= mlx5_ib_query_port;

include/linux/mlx5/cq.h

@@ -128,6 +128,9 @@ enum {
 	CQE_SIZE_128_PAD = 2,
 };
 
+#define MLX5_MAX_CQ_PERIOD (BIT(__mlx5_bit_sz(cqc, cq_period)) - 1)
+#define MLX5_MAX_CQ_COUNT (BIT(__mlx5_bit_sz(cqc, cq_max_count)) - 1)
+
 static inline int cqe_sz_to_mlx_sz(u8 size, int padding_128_en)
 {
 	return padding_128_en ? CQE_SIZE_128_PAD :