linux/drivers/net/ethernet/intel/ice/ice_repr.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2019-2021, Intel Corporation. */

#include "ice.h"
#include "ice_eswitch.h"
#include "ice_devlink.h"
#include "ice_virtchnl_pf.h"

/**
 * ice_repr_get_sw_port_id - get port ID associated with representor
 * @repr: pointer to port representor
 */
static int ice_repr_get_sw_port_id(struct ice_repr *repr)
{
	return repr->vf->pf->hw.port_info->lport;
}

/**
 * ice_repr_get_phys_port_name - get phys port name
 * @netdev: pointer to port representor netdev
 * @buf: write here port name
 * @len: max length of buf
 */
static int
ice_repr_get_phys_port_name(struct net_device *netdev, char *buf, size_t len)
{
	struct ice_netdev_priv *np = netdev_priv(netdev);
	struct ice_repr *repr = np->repr;
	int res;

	/* Devlink port is registered and devlink core is taking care of name formatting. */
	if (repr->vf->devlink_port.devlink)
		return -EOPNOTSUPP;

	res = snprintf(buf, len, "pf%dvfr%d", ice_repr_get_sw_port_id(repr),
		       repr->vf->vf_id);
	if (res <= 0)
		return -EOPNOTSUPP;
	return 0;
}

/**
 * ice_netdev_to_repr - Get port representor for given netdevice
 * @netdev: pointer to port representor netdev
 */
struct ice_repr *ice_netdev_to_repr(struct net_device *netdev)
{
	struct ice_netdev_priv *np = netdev_priv(netdev);

	return np->repr;
}

/**
 * ice_repr_open - Enable port representor's network interface
 * @netdev: network interface device structure
 *
 * The open entry point is called when a port representor's network
 * interface is made active by the system (IFF_UP). Corresponding
 * VF is notified about link status change.
 *
 * Returns 0 on success
 */
static int ice_repr_open(struct net_device *netdev)
{
	struct ice_repr *repr = ice_netdev_to_repr(netdev);
	struct ice_vf *vf;

	vf = repr->vf;
	vf->link_forced = true;
	vf->link_up = true;
	ice_vc_notify_vf_link_state(vf);

	netif_carrier_on(netdev);
	netif_tx_start_all_queues(netdev);

	return 0;
}

/**
 * ice_repr_stop - Disable port representor's network interface
 * @netdev: network interface device structure
 *
 * The stop entry point is called when a port representor's network
 * interface is de-activated by the system. Corresponding
 * VF is notified about link status change.
 *
 * Returns 0 on success
 */
static int ice_repr_stop(struct net_device *netdev)
{
	struct ice_repr *repr = ice_netdev_to_repr(netdev);
	struct ice_vf *vf;

	vf = repr->vf;
	vf->link_forced = true;
	vf->link_up = false;
	ice_vc_notify_vf_link_state(vf);

	netif_carrier_off(netdev);
	netif_tx_stop_all_queues(netdev);

	return 0;
}

static struct devlink_port *
ice_repr_get_devlink_port(struct net_device *netdev)
{
	struct ice_repr *repr = ice_netdev_to_repr(netdev);

	return &repr->vf->devlink_port;
}

static const struct net_device_ops ice_repr_netdev_ops = {
	.ndo_get_phys_port_name = ice_repr_get_phys_port_name,
	.ndo_open = ice_repr_open,
	.ndo_stop = ice_repr_stop,
	.ndo_get_devlink_port = ice_repr_get_devlink_port,
};

/**
 * ice_is_port_repr_netdev - Check if a given netdevice is a port representor netdev
 * @netdev: pointer to netdev
 */
bool ice_is_port_repr_netdev(struct net_device *netdev)
{
	return netdev && (netdev->netdev_ops == &ice_repr_netdev_ops);
}

/**
 * ice_repr_reg_netdev - register port representor netdev
 * @netdev: pointer to port representor netdev
 */
static int
ice_repr_reg_netdev(struct net_device *netdev)
{
	eth_hw_addr_random(netdev);
	netdev->netdev_ops = &ice_repr_netdev_ops;

	netif_carrier_off(netdev);
	netif_tx_stop_all_queues(netdev);

	return register_netdev(netdev);
}

/**
 * ice_repr_add - add representor for VF
 * @vf: pointer to VF structure
 */
static int ice_repr_add(struct ice_vf *vf)
{
	struct ice_q_vector *q_vector;
	struct ice_netdev_priv *np;
	struct ice_repr *repr;
	int err;

	repr = kzalloc(sizeof(*repr), GFP_KERNEL);
	if (!repr)
		return -ENOMEM;

	repr->netdev = alloc_etherdev(sizeof(struct ice_netdev_priv));
	if (!repr->netdev) {
		err =  -ENOMEM;
		goto err_alloc;
	}

	repr->src_vsi = ice_get_vf_vsi(vf);
	repr->vf = vf;
	vf->repr = repr;
	np = netdev_priv(repr->netdev);
	np->repr = repr;

	q_vector = kzalloc(sizeof(*q_vector), GFP_KERNEL);
	if (!q_vector) {
		err = -ENOMEM;
		goto err_alloc_q_vector;
	}
	repr->q_vector = q_vector;

	err = ice_devlink_create_vf_port(vf);
	if (err)
		goto err_devlink;

	err = ice_repr_reg_netdev(repr->netdev);
	if (err)
		goto err_netdev;

	devlink_port_type_eth_set(&vf->devlink_port, repr->netdev);

	return 0;

err_netdev:
	ice_devlink_destroy_vf_port(vf);
err_devlink:
	kfree(repr->q_vector);
	vf->repr->q_vector = NULL;
err_alloc_q_vector:
	free_netdev(repr->netdev);
	repr->netdev = NULL;
err_alloc:
	kfree(repr);
	vf->repr = NULL;
	return err;
}

/**
 * ice_repr_rem - remove representor from VF
 * @vf: pointer to VF structure
 */
static void ice_repr_rem(struct ice_vf *vf)
{
	ice_devlink_destroy_vf_port(vf);
	kfree(vf->repr->q_vector);
	vf->repr->q_vector = NULL;
	unregister_netdev(vf->repr->netdev);
	free_netdev(vf->repr->netdev);
	vf->repr->netdev = NULL;
	kfree(vf->repr);
	vf->repr = NULL;
}

/**
 * ice_repr_add_for_all_vfs - add port representor for all VFs
 * @pf: pointer to PF structure
 */
int ice_repr_add_for_all_vfs(struct ice_pf *pf)
{
	int err;
	int i;

	ice_for_each_vf(pf, i) {
		struct ice_vf *vf = &pf->vf[i];

		err = ice_repr_add(vf);
		if (err)
			goto err;

		ice_vc_change_ops_to_repr(&vf->vc_ops);
	}

	return 0;

err:
	for (i = i - 1; i >= 0; i--) {
		struct ice_vf *vf = &pf->vf[i];

		ice_repr_rem(vf);
		ice_vc_set_dflt_vf_ops(&vf->vc_ops);
	}

	return err;
}

/**
 * ice_repr_rem_from_all_vfs - remove port representor for all VFs
 * @pf: pointer to PF structure
 */
void ice_repr_rem_from_all_vfs(struct ice_pf *pf)
{
	int i;

	ice_for_each_vf(pf, i) {
		struct ice_vf *vf = &pf->vf[i];

		ice_repr_rem(vf);
		ice_vc_set_dflt_vf_ops(&vf->vc_ops);
	}
}

/**
 * ice_repr_start_tx_queues - start Tx queues of port representor
 * @repr: pointer to repr structure
 */
void ice_repr_start_tx_queues(struct ice_repr *repr)
{
	netif_carrier_on(repr->netdev);
	netif_tx_start_all_queues(repr->netdev);
}

/**
 * ice_repr_stop_tx_queues - stop Tx queues of port representor
 * @repr: pointer to repr structure
 */
void ice_repr_stop_tx_queues(struct ice_repr *repr)
{
	netif_carrier_off(repr->netdev);
	netif_tx_stop_all_queues(repr->netdev);
}

/**
 * ice_repr_set_traffic_vsi - set traffic VSI for port representor
 * @repr: repr on with VSI will be set
 * @vsi: pointer to VSI that will be used by port representor to pass traffic
 */
void ice_repr_set_traffic_vsi(struct ice_repr *repr, struct ice_vsi *vsi)
{
	struct ice_netdev_priv *np = netdev_priv(repr->netdev);

	np->vsi = vsi;
}