1 files changed, 329 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ice/ice_sf_eth.c b/drivers/net/ethernet/intel/ice/ice_sf_eth.c
new file mode 100644
index 000000000000..d00389c405c4
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_sf_eth.c
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: GPL-2.0
+/* 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
+ * @id: pointer to the auxiliary_device id
+ *
+ * Configure VSI and netdev resources for the subfunction device.
+ *
+ * Return: zero on success or an error code on failure.
+ */
+static int ice_sf_dev_probe(struct auxiliary_device *adev,
+			    const struct auxiliary_device_id *id)
+{
+	struct ice_sf_dev *sf_dev = ice_adev_to_sf_dev(adev);
+	struct ice_dynamic_port *dyn_port = sf_dev->dyn_port;
+	struct ice_vsi *vsi = dyn_port->vsi;
+	struct ice_pf *pf = dyn_port->pf;
+	struct device *dev = &adev->dev;
+	struct ice_sf_priv *priv;
+	struct devlink *devlink;
+	int err;
+
+	vsi->type = ICE_VSI_SF;
+	vsi->port_info = pf->hw.port_info;
+	vsi->flags = ICE_VSI_FLAG_INIT;
+
+	priv = ice_allocate_sf(&adev->dev, pf);
+	if (!priv) {
+		dev_err(dev, "Subfunction devlink alloc failed");
+		return -ENOMEM;
+	}
+
+	priv->dev = sf_dev;
+	sf_dev->priv = priv;
+	devlink = priv_to_devlink(priv);
+
+	devl_lock(devlink);
+
+	err = ice_vsi_cfg(vsi);
+	if (err) {
+		dev_err(dev, "Subfunction vsi config failed");
+		goto err_free_devlink;
+	}
+	vsi->sf = dyn_port;
+
+	ice_eswitch_update_repr(&dyn_port->repr_id, vsi);
+
+	err = ice_devlink_create_sf_dev_port(sf_dev);
+	if (err) {
+		dev_err(dev, "Cannot add ice virtual devlink port for subfunction");
+		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_netdev_decfg;
+	}
+
+	ice_napi_add(vsi);
+
+	devl_register(devlink);
+	devl_unlock(devlink);
+
+	dyn_port->attached = true;
+
+	return 0;
+
+err_netdev_decfg:
+	ice_sf_decfg_netdev(vsi);
+err_devlink_destroy:
+	ice_devlink_destroy_sf_dev_port(sf_dev);
+err_vsi_decfg:
+	ice_vsi_decfg(vsi);
+err_free_devlink:
+	devl_unlock(devlink);
+	devlink_free(devlink);
+	return err;
+}
+
+/**
+ * ice_sf_dev_remove - subfunction driver remove function
+ * @adev: pointer to the auxiliary device
+ *
+ * Deinitalize VSI and netdev resources for the subfunction device.
+ */
+static void ice_sf_dev_remove(struct auxiliary_device *adev)
+{
+	struct ice_sf_dev *sf_dev = ice_adev_to_sf_dev(adev);
+	struct ice_dynamic_port *dyn_port = sf_dev->dyn_port;
+	struct ice_vsi *vsi = dyn_port->vsi;
+	struct devlink *devlink;
+
+	devlink = priv_to_devlink(sf_dev->priv);
+	devl_lock(devlink);
+
+	ice_vsi_close(vsi);
+
+	ice_sf_decfg_netdev(vsi);
+	ice_devlink_destroy_sf_dev_port(sf_dev);
+	devl_unregister(devlink);
+	devl_unlock(devlink);
+	devlink_free(devlink);
+	ice_vsi_decfg(vsi);
+
+	dyn_port->attached = false;
+}
+
+static const struct auxiliary_device_id ice_sf_dev_id_table[] = {
+	{ .name = "ice.sf", },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(auxiliary, ice_sf_dev_id_table);
+
+static struct auxiliary_driver ice_sf_driver = {
+	.name = "sf",
+	.probe = ice_sf_dev_probe,
+	.remove = ice_sf_dev_remove,
+	.id_table = ice_sf_dev_id_table
+};
+
+static DEFINE_XARRAY_ALLOC1(ice_sf_aux_id);
+
+/**
+ * ice_sf_driver_register - Register new auxiliary subfunction driver
+ *
+ * Return: zero on success or an error code on failure.
+ */
+int ice_sf_driver_register(void)
+{
+	return auxiliary_driver_register(&ice_sf_driver);
+}
+
+/**
+ * ice_sf_driver_unregister - Unregister new auxiliary subfunction driver
+ *
+ */
+void ice_sf_driver_unregister(void)
+{
+	auxiliary_driver_unregister(&ice_sf_driver);
+}
+
+/**
+ * ice_sf_dev_release - Release device associated with auxiliary device
+ * @device: pointer to the device
+ *
+ * Since most of the code for subfunction deactivation is handled in
+ * the remove handler, here just free tracking resources.
+ */
+static void ice_sf_dev_release(struct device *device)
+{
+	struct auxiliary_device *adev = to_auxiliary_dev(device);
+	struct ice_sf_dev *sf_dev = ice_adev_to_sf_dev(adev);
+
+	xa_erase(&ice_sf_aux_id, adev->id);
+	kfree(sf_dev);
+}
+
+/**
+ * ice_sf_eth_activate - Activate Ethernet subfunction port
+ * @dyn_port: the dynamic port instance for this subfunction
+ * @extack: extack for reporting error messages
+ *
+ * Activate the dynamic port as an Ethernet subfunction. Setup the netdev
+ * resources associated and initialize the auxiliary device.
+ *
+ * Return: zero on success or an error code on failure.
+ */
+int
+ice_sf_eth_activate(struct ice_dynamic_port *dyn_port,
+		    struct netlink_ext_ack *extack)
+{
+	struct ice_pf *pf = dyn_port->pf;
+	struct ice_sf_dev *sf_dev;
+	struct pci_dev *pdev;
+	int err;
+	u32 id;
+
+	err = xa_alloc(&ice_sf_aux_id, &id, NULL, xa_limit_32b,
+		       GFP_KERNEL);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Could not allocate SF ID");
+		return err;
+	}
+
+	sf_dev = kzalloc(sizeof(*sf_dev), GFP_KERNEL);
+	if (!sf_dev) {
+		err = -ENOMEM;
+		NL_SET_ERR_MSG_MOD(extack, "Could not allocate SF memory");
+		goto xa_erase;
+	}
+	pdev = pf->pdev;
+
+	sf_dev->dyn_port = dyn_port;
+	sf_dev->adev.id = id;
+	sf_dev->adev.name = "sf";
+	sf_dev->adev.dev.release = ice_sf_dev_release;
+	sf_dev->adev.dev.parent = &pdev->dev;
+
+	err = auxiliary_device_init(&sf_dev->adev);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to initialize SF device");
+		goto sf_dev_free;
+	}
+
+	err = auxiliary_device_add(&sf_dev->adev);
+	if (err) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to add SF device");
+		goto aux_dev_uninit;
+	}
+
+	dyn_port->sf_dev = sf_dev;
+
+	return 0;
+
+aux_dev_uninit:
+	auxiliary_device_uninit(&sf_dev->adev);
+sf_dev_free:
+	kfree(sf_dev);
+xa_erase:
+	xa_erase(&ice_sf_aux_id, id);
+
+	return err;
+}
+
+/**
+ * ice_sf_eth_deactivate - Deactivate Ethernet subfunction port
+ * @dyn_port: the dynamic port instance for this subfunction
+ *
+ * Deactivate the Ethernet subfunction, removing its auxiliary device and the
+ * associated resources.
+ */
+void ice_sf_eth_deactivate(struct ice_dynamic_port *dyn_port)
+{
+	struct ice_sf_dev *sf_dev = dyn_port->sf_dev;
+
+	auxiliary_device_delete(&sf_dev->adev);
+	auxiliary_device_uninit(&sf_dev->adev);
+}