net/mlx5: E-switch, Set representor attributes for adjacent VFs

Adjacent vfs get their devlink port information from firmware,
use the information (pfnum, function id) from FW when populating the
devlink port attributes.

Before:
$ devlink port show
pci/0000:00:03.0/180225: type eth netdev eth0 flavour pcivf controller 0 pfnum 0 vfnum 49152 external false splittable false
  function:
    hw_addr 00:00:00:00:00:00

After:
$ devlink port show
pci/0000:00:03.0/180225: type eth netdev enp0s3npf0vf2 flavour pcivf controller 0 pfnum 0 vfnum 2 external false splittable false
  function:
    hw_addr 00:00:00:00:00:00

Signed-off-by: Adithya Jayachandran <ajayachandra@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250829223722.900629-7-saeed@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

3 files changed, 26 insertions, 6 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/esw/adj_vport.c b/drivers/net/ethernet/mellanox/mlx5/core/esw/adj_vport.c
index 3380f85678bc..0091ba697bae 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/esw/adj_vport.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/esw/adj_vport.c
@@ -57,7 +57,8 @@ static int mlx5_esw_create_esw_vport(struct mlx5_core_dev *dev, u16 vhca_id,
 	return err;
 }
 
-static int mlx5_esw_adj_vport_create(struct mlx5_eswitch *esw, u16 vhca_id)
+static int mlx5_esw_adj_vport_create(struct mlx5_eswitch *esw, u16 vhca_id,
+				     const void *rid_info_reg)
 {
 	struct mlx5_vport *vport;
 	u16 vport_num;
@@ -83,6 +84,12 @@ static int mlx5_esw_adj_vport_create(struct mlx5_eswitch *esw, u16 vhca_id)
 	vport->adjacent = true;
 	vport->vhca_id = vhca_id;
 
+	vport->adj_info.parent_pci_devfn =
+		MLX5_GET(function_vhca_rid_info_reg, rid_info_reg,
+			 parent_pci_device_function);
+	vport->adj_info.function_id =
+		MLX5_GET(function_vhca_rid_info_reg, rid_info_reg, function_id);
+
 	mlx5_fs_vport_egress_acl_ns_add(esw->dev->priv.steering, vport->index);
 	mlx5_fs_vport_ingress_acl_ns_add(esw->dev->priv.steering, vport->index);
 	err = mlx5_esw_offloads_rep_add(esw, vport);
@@ -176,7 +183,7 @@ void mlx5_esw_adjacent_vhcas_setup(struct mlx5_eswitch *esw)
 	esw_debug(esw->dev, "Delegated vhca functions count %d\n", count);
 
 	for (i = 0; i < count; i++) {
-		void *rid_info, *rid_info_reg;
+		const void *rid_info, *rid_info_reg;
 		u16 vhca_id;
 
 		rid_info = MLX5_ADDR_OF(query_delegated_vhca_out, out,
@@ -187,10 +194,9 @@ void mlx5_esw_adjacent_vhcas_setup(struct mlx5_eswitch *esw)
 
 		vhca_id = MLX5_GET(function_vhca_rid_info_reg, rid_info_reg,
 				   vhca_id);
-		esw_debug(esw->dev, "Delegating vhca_id 0x%x rid info:\n",
-			  vhca_id);
+		esw_debug(esw->dev, "Delegating vhca_id 0x%x\n", vhca_id);
 
-		err = mlx5_esw_adj_vport_create(esw, vhca_id);
+		err = mlx5_esw_adj_vport_create(esw, vhca_id, rid_info_reg);
 		if (err) {
 			esw_warn(esw->dev,
 				 "Failed to init adjacent vhca 0x%x, err %d\n",
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/esw/devlink_port.c b/drivers/net/ethernet/mellanox/mlx5/core/esw/devlink_port.c
index c33accadae0f..cf88a106d80d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/esw/devlink_port.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/esw/devlink_port.c
@@ -27,6 +27,7 @@ static void mlx5_esw_offloads_pf_vf_devlink_port_attrs_set(struct mlx5_eswitch *
 {
 	struct mlx5_core_dev *dev = esw->dev;
 	struct netdev_phys_item_id ppid = {};
+	struct mlx5_vport *vport;
 	u32 controller_num = 0;
 	bool external;
 	u16 pfnum;
@@ -42,10 +43,18 @@ static void mlx5_esw_offloads_pf_vf_devlink_port_attrs_set(struct mlx5_eswitch *
 		dl_port->attrs.switch_id.id_len = ppid.id_len;
 		devlink_port_attrs_pci_pf_set(dl_port, controller_num, pfnum, external);
 	} else if (mlx5_eswitch_is_vf_vport(esw, vport_num)) {
+		u16 func_id = vport_num - 1;
+
+		vport = mlx5_eswitch_get_vport(esw, vport_num);
 		memcpy(dl_port->attrs.switch_id.id, ppid.id, ppid.id_len);
 		dl_port->attrs.switch_id.id_len = ppid.id_len;
+		if (vport->adjacent) {
+			func_id = vport->adj_info.function_id;
+			pfnum = vport->adj_info.parent_pci_devfn;
+		}
+
 		devlink_port_attrs_pci_vf_set(dl_port, controller_num, pfnum,
-					      vport_num - 1, external);
+					      func_id, external);
 	}  else if (mlx5_core_is_ec_vf_vport(esw->dev, vport_num)) {
 		u16 base_vport = mlx5_core_ec_vf_vport_base(dev);
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index 6d36d8bbb979..4fe285ce32aa 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -217,6 +217,11 @@ struct mlx5_vport {
 	int                     vhca_id;
 
 	bool adjacent; /* delegated vhca from adjacent function */
+	struct {
+		u16 parent_pci_devfn; /* Adjacent parent PCI device function */
+		u16 function_id; /* Function ID of the delegated VPort */
+	} adj_info;
+
 	struct mlx5_vport_info  info;
 
 	/* Protected with the E-Switch qos domain lock. The Vport QoS can