Subject: [net-next 11/15] net/mlx5: Relax mlx5_devlink_eswitch_get() return value checking

From: Saeed Mahameed <[email-masked]>
Date: Tue, 22 Aug 2023 22:10:08 -0700

From: Jiri Pirko <[email-masked]>

If called from port ops, it is not needed to perform the checks in
mlx5_devlink_eswitch_get(). The reason is devlink port would not be
registered if the checks are not true. Introduce relaxed version
mlx5_devlink_eswitch_nocheck_get() and use it in port ops.

Signed-off-by: Jiri Pirko <[email-masked]>
Reviewed-by: Shay Drory <[email-masked]>
Signed-off-by: Saeed Mahameed <[email-masked]>
---
 .../net/ethernet/mellanox/mlx5/core/eswitch.c | 21 ++++++++--
 .../net/ethernet/mellanox/mlx5/core/eswitch.h |  6 ++-
 .../mellanox/mlx5/core/eswitch_offloads.c     | 39 ++++---------------
 3 files changed, 29 insertions(+), 37 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
index 5368b33fde63..db1c2a076364 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -77,18 +77,31 @@ static int mlx5_eswitch_check(const struct mlx5_core_dev *dev)
 	return 0;
 }
 
-struct mlx5_eswitch *mlx5_devlink_eswitch_get(struct devlink *devlink)
+static struct mlx5_eswitch *__mlx5_devlink_eswitch_get(struct devlink *devlink, bool check)
 {
 	struct mlx5_core_dev *dev = devlink_priv(devlink);
 	int err;
 
-	err = mlx5_eswitch_check(dev);
-	if (err)
-		return ERR_PTR(err);
+	if (check) {
+		err = mlx5_eswitch_check(dev);
+		if (err)
+			return ERR_PTR(err);
+	}
 
 	return dev->priv.eswitch;
 }
 
+struct mlx5_eswitch *__must_check
+mlx5_devlink_eswitch_get(struct devlink *devlink)
+{
+	return __mlx5_devlink_eswitch_get(devlink, true);
+}
+
+struct mlx5_eswitch *mlx5_devlink_eswitch_nocheck_get(struct devlink *devlink)
+{
+	return __mlx5_devlink_eswitch_get(devlink, false);
+}
+
 struct mlx5_vport *__must_check
 mlx5_eswitch_get_vport(struct mlx5_eswitch *esw, u16 vport_num)
 {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index 8d03d4fe6eec..9f94c3d6d6e5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -679,7 +679,11 @@ void mlx5e_tc_clean_fdb_peer_flows(struct mlx5_eswitch *esw);
 			  MLX5_CAP_GEN_2((esw->dev), ec_vf_vport_base) +\
 			  (last) - 1)
 
-struct mlx5_eswitch *mlx5_devlink_eswitch_get(struct devlink *devlink);
+struct mlx5_eswitch *__must_check
+mlx5_devlink_eswitch_get(struct devlink *devlink);
+
+struct mlx5_eswitch *mlx5_devlink_eswitch_nocheck_get(struct devlink *devlink);
+
 struct mlx5_vport *__must_check
 mlx5_eswitch_get_vport(struct mlx5_eswitch *esw, u16 vport_num);
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 87cc6ad2e17f..23b562f07c68 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -3634,7 +3634,7 @@ static bool esw_offloads_devlink_ns_eq_netdev_ns(struct devlink *devlink)
 	struct net *devl_net, *netdev_net;
 	struct mlx5_eswitch *esw;
 
-	esw = mlx5_devlink_eswitch_get(devlink);
+	esw = mlx5_devlink_eswitch_nocheck_get(devlink);
 	netdev_net = dev_net(esw->dev->mlx5e_res.uplink_netdev);
 	devl_net = devlink_net(devlink);
 
@@ -4222,13 +4222,10 @@ int mlx5_devlink_port_fn_hw_addr_get(struct devlink_port *port,
 				     u8 *hw_addr, int *hw_addr_len,
 				     struct netlink_ext_ack *extack)
 {
-	struct mlx5_eswitch *esw;
+	struct mlx5_eswitch *esw = mlx5_devlink_eswitch_nocheck_get(port->devlink);
 	struct mlx5_vport *vport;
 	u16 vport_num;
 
-	esw = mlx5_devlink_eswitch_get(port->devlink);
-	if (IS_ERR(esw))
-		return PTR_ERR(esw);
 
 	vport_num = mlx5_esw_devlink_port_index_to_vport_num(port->index);
 
@@ -4249,15 +4246,9 @@ int mlx5_devlink_port_fn_hw_addr_set(struct devlink_port *port,
 				     const u8 *hw_addr, int hw_addr_len,
 				     struct netlink_ext_ack *extack)
 {
-	struct mlx5_eswitch *esw;
+	struct mlx5_eswitch *esw = mlx5_devlink_eswitch_nocheck_get(port->devlink);
 	u16 vport_num;
 
-	esw = mlx5_devlink_eswitch_get(port->devlink);
-	if (IS_ERR(esw)) {
-		NL_SET_ERR_MSG_MOD(extack, "Eswitch doesn't support set hw_addr");
-		return PTR_ERR(esw);
-	}
-
 	vport_num = mlx5_esw_devlink_port_index_to_vport_num(port->index);
 	return mlx5_eswitch_set_vport_mac(esw, vport_num, hw_addr);
 }
@@ -4277,13 +4268,9 @@ mlx5_devlink_port_fn_get_vport(struct devlink_port *port, struct mlx5_eswitch *e
 int mlx5_devlink_port_fn_migratable_get(struct devlink_port *port, bool *is_enabled,
 					struct netlink_ext_ack *extack)
 {
-	struct mlx5_eswitch *esw;
+	struct mlx5_eswitch *esw = mlx5_devlink_eswitch_nocheck_get(port->devlink);
 	struct mlx5_vport *vport;
 
-	esw = mlx5_devlink_eswitch_get(port->devlink);
-	if (IS_ERR(esw))
-		return PTR_ERR(esw);
-
 	if (!MLX5_CAP_GEN(esw->dev, migration)) {
 		NL_SET_ERR_MSG_MOD(extack, "Device doesn't support migration");
 		return -EOPNOTSUPP;
@@ -4304,17 +4291,13 @@ int mlx5_devlink_port_fn_migratable_get(struct devlink_port *port, bool *is_enab
 int mlx5_devlink_port_fn_migratable_set(struct devlink_port *port, bool enable,
 					struct netlink_ext_ack *extack)
 {
+	struct mlx5_eswitch *esw = mlx5_devlink_eswitch_nocheck_get(port->devlink);
 	int query_out_sz = MLX5_ST_SZ_BYTES(query_hca_cap_out);
-	struct mlx5_eswitch *esw;
 	struct mlx5_vport *vport;
 	void *query_ctx;
 	void *hca_caps;
 	int err;
 
-	esw = mlx5_devlink_eswitch_get(port->devlink);
-	if (IS_ERR(esw))
-		return PTR_ERR(esw);
-
 	if (!MLX5_CAP_GEN(esw->dev, migration)) {
 		NL_SET_ERR_MSG_MOD(extack, "Device doesn't support migration");
 		return -EOPNOTSUPP;
@@ -4368,13 +4351,9 @@ int mlx5_devlink_port_fn_migratable_set(struct devlink_port *port, bool enable,
 int mlx5_devlink_port_fn_roce_get(struct devlink_port *port, bool *is_enabled,
 				  struct netlink_ext_ack *extack)
 {
-	struct mlx5_eswitch *esw;
+	struct mlx5_eswitch *esw = mlx5_devlink_eswitch_nocheck_get(port->devlink);
 	struct mlx5_vport *vport;
 
-	esw = mlx5_devlink_eswitch_get(port->devlink);
-	if (IS_ERR(esw))
-		return PTR_ERR(esw);
-
 	vport = mlx5_devlink_port_fn_get_vport(port, esw);
 	if (IS_ERR(vport)) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid port");
@@ -4390,18 +4369,14 @@ int mlx5_devlink_port_fn_roce_get(struct devlink_port *port, bool *is_enabled,
 int mlx5_devlink_port_fn_roce_set(struct devlink_port *port, bool enable,
 				  struct netlink_ext_ack *extack)
 {
+	struct mlx5_eswitch *esw = mlx5_devlink_eswitch_nocheck_get(port->devlink);
 	int query_out_sz = MLX5_ST_SZ_BYTES(query_hca_cap_out);
-	struct mlx5_eswitch *esw;
 	struct mlx5_vport *vport;
 	void *query_ctx;
 	void *hca_caps;
 	u16 vport_num;
 	int err;
 
-	esw = mlx5_devlink_eswitch_get(port->devlink);
-	if (IS_ERR(esw))
-		return PTR_ERR(esw);
-
 	vport = mlx5_devlink_port_fn_get_vport(port, esw);
 	if (IS_ERR(vport)) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid port");
-- 
2.41.0