net/mlx5: Skip pages EQ creation for non-page supplier function

Page events are not issued by device on the function if
page_request_disable is set, so no need to create pages EQ.
Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20240402133043.56322-11-tariqt@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/eq.c

@@ -688,6 +688,12 @@ static int create_async_eqs(struct mlx5_core_dev *dev)
 	if (err)
 		goto err2;
 
+	/* Skip page eq creation when the device does not request for page requests */
+	if (MLX5_CAP_GEN(dev, page_request_disable)) {
+		mlx5_core_dbg(dev, "Skip page EQ creation\n");
+		return 0;
+	}
+
 	param = (struct mlx5_eq_param) {
 		.irq = table->ctrl_irq,
 		.nent = /* TODO: sriov max_vf + */ 1,
@@ -716,6 +722,7 @@ static void destroy_async_eqs(struct mlx5_core_dev *dev)
 {
 	struct mlx5_eq_table *table = dev->priv.eq_table;
 
+	if (!MLX5_CAP_GEN(dev, page_request_disable))
 		cleanup_async_eq(dev, &table->pages_eq, "pages");
 	cleanup_async_eq(dev, &table->async_eq, "async");
 	mlx5_cmd_allowed_opcode(dev, MLX5_CMD_OP_DESTROY_EQ);

include/linux/mlx5/mlx5_ifc.h

@@ -1485,7 +1485,9 @@ enum {
 };
 
 struct mlx5_ifc_cmd_hca_cap_bits {
-	u8         reserved_at_0[0x10];
+	u8         reserved_at_0[0x6];
+	u8         page_request_disable[0x1];
+	u8         reserved_at_7[0x9];
 	u8         shared_object_to_user_object_allowed[0x1];
 	u8         reserved_at_13[0xe];
 	u8         vhca_resource_manager[0x1];