ice: implement netdev for subfunction

Configure netdevice for subfunction usecase. Mostly it is reusing ops
from the PF netdevice.

SF netdev is linked to devlink port registered after SF activation.
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Piotr Raczynski <piotr.raczynski@intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_sf_eth.c

@@ -2,11 +2,86 @@
 /* Copyright (c) 2024, Intel Corporation. */
 #include "ice.h"
 #include "ice_lib.h"
+#include "ice_txrx.h"
 #include "ice_fltr.h"
 #include "ice_sf_eth.h"
 #include "devlink/devlink_port.h"
 #include "devlink/devlink.h"
 
+static const struct net_device_ops ice_sf_netdev_ops = {
+	.ndo_open = ice_open,
+	.ndo_stop = ice_stop,
+	.ndo_start_xmit = ice_start_xmit,
+	.ndo_vlan_rx_add_vid = ice_vlan_rx_add_vid,
+	.ndo_vlan_rx_kill_vid = ice_vlan_rx_kill_vid,
+	.ndo_change_mtu = ice_change_mtu,
+	.ndo_get_stats64 = ice_get_stats64,
+	.ndo_tx_timeout = ice_tx_timeout,
+	.ndo_bpf = ice_xdp,
+	.ndo_xdp_xmit = ice_xdp_xmit,
+	.ndo_xsk_wakeup = ice_xsk_wakeup,
+};
+
+/**
+ * ice_sf_cfg_netdev - Allocate, configure and register a netdev
+ * @dyn_port: subfunction associated with configured netdev
+ * @devlink_port: subfunction devlink port to be linked with netdev
+ *
+ * Return: 0 on success, negative value on failure
+ */
+static int ice_sf_cfg_netdev(struct ice_dynamic_port *dyn_port,
+			     struct devlink_port *devlink_port)
+{
+	struct ice_vsi *vsi = dyn_port->vsi;
+	struct ice_netdev_priv *np;
+	struct net_device *netdev;
+	int err;
+
+	netdev = alloc_etherdev_mqs(sizeof(*np), vsi->alloc_txq,
+				    vsi->alloc_rxq);
+	if (!netdev)
+		return -ENOMEM;
+
+	SET_NETDEV_DEV(netdev, &vsi->back->pdev->dev);
+	set_bit(ICE_VSI_NETDEV_ALLOCD, vsi->state);
+	vsi->netdev = netdev;
+	np = netdev_priv(netdev);
+	np->vsi = vsi;
+
+	ice_set_netdev_features(netdev);
+
+	netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
+			       NETDEV_XDP_ACT_XSK_ZEROCOPY |
+			       NETDEV_XDP_ACT_RX_SG;
+	netdev->xdp_zc_max_segs = ICE_MAX_BUF_TXD;
+
+	eth_hw_addr_set(netdev, dyn_port->hw_addr);
+	ether_addr_copy(netdev->perm_addr, dyn_port->hw_addr);
+	netdev->netdev_ops = &ice_sf_netdev_ops;
+	SET_NETDEV_DEVLINK_PORT(netdev, devlink_port);
+
+	err = register_netdev(netdev);
+	if (err) {
+		free_netdev(netdev);
+		vsi->netdev = NULL;
+		return -ENOMEM;
+	}
+	set_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state);
+	netif_carrier_off(netdev);
+	netif_tx_stop_all_queues(netdev);
+
+	return 0;
+}
+
+static void ice_sf_decfg_netdev(struct ice_vsi *vsi)
+{
+	unregister_netdev(vsi->netdev);
+	clear_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state);
+	free_netdev(vsi->netdev);
+	vsi->netdev = NULL;
+	clear_bit(ICE_VSI_NETDEV_ALLOCD, vsi->state);
+}
+
 /**
  * ice_sf_dev_probe - subfunction driver probe function
  * @adev: pointer to the auxiliary device
@@ -57,10 +132,16 @@ static int ice_sf_dev_probe(struct auxiliary_device *adev,
 		goto err_vsi_decfg;
 	}
 
+	err = ice_sf_cfg_netdev(dyn_port, &sf_dev->priv->devlink_port);
+	if (err) {
+		dev_err(dev, "Subfunction netdev config failed");
+		goto err_devlink_destroy;
+	}
+
 	err = devl_port_fn_devlink_set(&dyn_port->devlink_port, devlink);
 	if (err) {
 		dev_err(dev, "Can't link devlink instance to SF devlink port");
-		goto err_devlink_destroy;
+		goto err_netdev_decfg;
 	}
 
 	ice_napi_add(vsi);
@@ -70,6 +151,8 @@ static int ice_sf_dev_probe(struct auxiliary_device *adev,
 
 	return 0;
 
+err_netdev_decfg:
+	ice_sf_decfg_netdev(vsi);
 err_devlink_destroy:
 	ice_devlink_destroy_sf_dev_port(sf_dev);
 err_vsi_decfg:
@@ -98,6 +181,7 @@ static void ice_sf_dev_remove(struct auxiliary_device *adev)
 
 	ice_vsi_close(vsi);
 
+	ice_sf_decfg_netdev(vsi);
 	ice_devlink_destroy_sf_dev_port(sf_dev);
 	devl_unregister(devlink);
 	devl_unlock(devlink);