path: root/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) Meta Platforms, Inc. and affiliates. */

#include <linux/etherdevice.h>
#include <linux/ipv6.h>
#include <linux/types.h>
#include <net/netdev_queues.h>

#include "fbnic.h"
#include "fbnic_netdev.h"
#include "fbnic_txrx.h"

int __fbnic_open(struct fbnic_net *fbn)
{
	struct fbnic_dev *fbd = fbn->fbd;
	int err;

	err = fbnic_alloc_napi_vectors(fbn);
	if (err)
		return err;

	err = fbnic_alloc_resources(fbn);
	if (err)
		goto free_napi_vectors;

	err = fbnic_set_netif_queues(fbn);
	if (err)
		goto free_resources;

	/* Send ownership message and flush to verify FW has seen it */
	err = fbnic_fw_xmit_ownership_msg(fbd, true);
	if (err) {
		dev_warn(fbd->dev,
			 "Error %d sending host ownership message to the firmware\n",
			 err);
		goto err_reset_queues;
	}

	err = fbnic_time_start(fbn);
	if (err)
		goto release_ownership;

	err = fbnic_fw_init_heartbeat(fbd, false);
	if (err)
		goto time_stop;

	err = fbnic_mac_request_irq(fbd);
	if (err)
		goto time_stop;

	/* Pull the BMC config and initialize the RPC */
	fbnic_bmc_rpc_init(fbd);
	fbnic_rss_reinit(fbd, fbn);

	phylink_resume(fbn->phylink);

	return 0;
time_stop:
	fbnic_time_stop(fbn);
release_ownership:
	fbnic_fw_xmit_ownership_msg(fbn->fbd, false);
err_reset_queues:
	fbnic_reset_netif_queues(fbn);
free_resources:
	fbnic_free_resources(fbn);
free_napi_vectors:
	fbnic_free_napi_vectors(fbn);
	return err;
}

static int fbnic_open(struct net_device *netdev)
{
	struct fbnic_net *fbn = netdev_priv(netdev);
	int err;

	fbnic_napi_name_irqs(fbn->fbd);

	err = __fbnic_open(fbn);
	if (!err)
		fbnic_up(fbn);

	return err;
}

static int fbnic_stop(struct net_device *netdev)
{
	struct fbnic_net *fbn = netdev_priv(netdev);

	fbnic_mac_free_irq(fbn->fbd);
	phylink_suspend(fbn->phylink, fbnic_bmc_present(fbn->fbd));

	fbnic_down(fbn);

	fbnic_time_stop(fbn);
	fbnic_fw_xmit_ownership_msg(fbn->fbd, false);

	fbnic_reset_netif_queues(fbn);
	fbnic_free_resources(fbn);
	fbnic_free_napi_vectors(fbn);

	return 0;
}

static int fbnic_uc_sync(struct net_device *netdev, const unsigned char *addr)
{
	struct fbnic_net *fbn = netdev_priv(netdev);
	struct fbnic_mac_addr *avail_addr;

	if (WARN_ON(!is_valid_ether_addr(addr)))
		return -EADDRNOTAVAIL;

	avail_addr = __fbnic_uc_sync(fbn->fbd, addr);
	if (!avail_addr)
		return -ENOSPC;

	/* Add type flag indicating this address is in use by the host */
	set_bit(FBNIC_MAC_ADDR_T_UNICAST, avail_addr->act_tcam);

	return 0;
}

static int fbnic_uc_unsync(struct net_device *netdev, const unsigned char *addr)
{
	struct fbnic_net *fbn = netdev_priv(netdev);
	struct fbnic_dev *fbd = fbn->fbd;
	int i, ret;

	/* Scan from middle of list to bottom, filling bottom up.
	 * Skip the first entry which is reserved for dev_addr and
	 * leave the last entry to use for promiscuous filtering.
	 */
	for (i = fbd->mac_addr_boundary, ret = -ENOENT;
	     i < FBNIC_RPC_TCAM_MACDA_HOST_ADDR_IDX && ret; i++) {
		struct fbnic_mac_addr *mac_addr = &fbd->mac_addr[i];

		if (!ether_addr_equal(mac_addr->value.addr8, addr))
			continue;

		ret = __fbnic_uc_unsync(mac_addr);
	}

	return ret;
}

static int fbnic_mc_sync(struct net_device *netdev, const unsigned char *addr)
{
	struct fbnic_net *fbn = netdev_priv(netdev);
	struct fbnic_mac_addr *avail_addr;

	if (WARN_ON(!is_multicast_ether_addr(addr)))
		return -EADDRNOTAVAIL;

	avail_addr = __fbnic_mc_sync(fbn->fbd, addr);
	if (!avail_addr)
		return -ENOSPC;

	/* Add type flag indicating this address is in use by the host */
	set_bit(FBNIC_MAC_ADDR_T_MULTICAST, avail_addr->act_tcam);

	return 0;
}

static int fbnic_mc_unsync(struct net_device *netdev, const unsigned char *addr)
{
	struct fbnic_net *fbn = netdev_priv(netdev);
	struct fbnic_dev *fbd = fbn->fbd;
	int i, ret;

	/* Scan from middle of list to top, filling top down.
	 * Skip over the address reserved for the BMC MAC and
	 * exclude index 0 as that belongs to the broadcast address
	 */
	for (i = fbd->mac_addr_boundary, ret = -ENOENT;
	     --i > FBNIC_RPC_TCAM_MACDA_BROADCAST_IDX && ret;) {
		struct fbnic_mac_addr *mac_addr = &fbd->mac_addr[i