net/mlx5: Update pfnum retrieval for devlink port attributes

Align mlx5 driver usage of 'pfnum' with the documentation clarification
introduced in commit bb70b0d ("devlink: Improve the port attributes
description").

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1742392983-153050-4-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: shayshyi

drivers/net/ethernet/mellanox/mlx5/core/esw/devlink_port.c

@@ -32,7 +32,7 @@ static void mlx5_esw_offloads_pf_vf_devlink_port_attrs_set(struct mlx5_eswitch *
 	u16 pfnum;
 
 	mlx5_esw_get_port_parent_id(dev, &ppid);
-	pfnum = mlx5_get_dev_index(dev);
+	pfnum = PCI_FUNC(dev->pdev->devfn);
 	external = mlx5_core_is_ecpf_esw_manager(dev);
 	if (external)
 		controller_num = dev->priv.eswitch->offloads.host_number + 1;
@@ -110,7 +110,7 @@ static void mlx5_esw_offloads_sf_devlink_port_attrs_set(struct mlx5_eswitch *esw
 	struct netdev_phys_item_id ppid = {};
 	u16 pfnum;
 
-	pfnum = mlx5_get_dev_index(dev);
+	pfnum = PCI_FUNC(dev->pdev->devfn);
 	mlx5_esw_get_port_parent_id(dev, &ppid);
 	memcpy(dl_port->attrs.switch_id.id, &ppid.id[0], ppid.id_len);
 	dl_port->attrs.switch_id.id_len = ppid.id_len;

drivers/net/ethernet/mellanox/mlx5/core/sf/devlink.c

@@ -285,7 +285,7 @@ mlx5_sf_new_check_attr(struct mlx5_core_dev *dev, const struct devlink_port_new_
 		NL_SET_ERR_MSG_MOD(extack, "External controller is unsupported");
 		return -EOPNOTSUPP;
 	}
-	if (new_attr->pfnum != mlx5_get_dev_index(dev)) {
+	if (new_attr->pfnum != PCI_FUNC(dev->pdev->devfn)) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid pfnum supplied");
 		return -EOPNOTSUPP;
 	}