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// 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 "fbnic.h"
#include "fbnic_netdev.h"
#include "fbnic_txrx.h"
int __fbnic_open(struct fbnic_net *fbn)
{
int err;
err = fbnic_alloc_napi_vectors(fbn);
if (err)
return err;
err = fbnic_alloc_resources(fbn);
if (err)
goto free_napi_vectors;
err = netif_set_real_num_tx_queues(fbn->netdev,
fbn->num_tx_queues);
if (err)
goto free_resources;
err = netif_set_real_num_rx_queues(fbn->netdev,
fbn->num_rx_queues);
if (err)
goto free_resources;
return 0;
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;
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_down(fbn);
fbnic_free_resources(fbn);
fbnic_free_napi_vectors(fbn);
return 0;
}
static const struct net_device_ops fbnic_netdev_ops = {
.ndo_open = fbnic_open,
.ndo_stop = fbnic_stop,
.ndo_validate_addr = eth_validate_addr,
.ndo_start_xmit = fbnic_xmit_frame,
};
void fbnic_reset_queues(struct fbnic_net *fbn,
unsigned int tx, unsigned int rx)
{
struct fbnic_dev *fbd = fbn->fbd;
unsigned int max_napis;
max_napis = fbd->num_irqs - FBNIC_NON_NAPI_VECTORS;
tx = min(tx, max_napis);
fbn->num_tx_queues = tx;
rx = min(rx, max_napis);
fbn->num_rx_queues = rx;
fbn->num_napi = max(tx, rx);
}
/**
* fbnic_netdev_free - Free the netdev associate with fbnic
* @fbd: Driver specific structure to free netdev from
*
* Allocate and initialize the netdev and netdev private structure. Bind
* together the hardware, netdev, and pci data structures.
**/
void fbnic_netdev_free(struct fbnic_dev *fbd)
{
free_netdev(fbd->netdev);
fbd->netdev = NULL;
}
/**
* fbnic_netdev_alloc - Allocate a netdev and associate with fbnic
* @fbd: Driver specific structure to associate netdev with
*
* Allocate and initialize the netdev and netdev private structure. Bind
* together the hardware, netdev, and pci data structures.
*
* Return: 0 on success, negative on failure
**/
struct net_device *fbnic_netdev_alloc(struct fbnic_dev *fbd)
{
struct net_device *netdev;
struct fbnic_net *fbn;
int default_queues;
netdev = alloc_etherdev_mq(sizeof(*fbn), FBNIC_MAX_RXQS);
if (!netdev)
return NULL;
SET_NETDEV_DEV(netdev, fbd->dev);
fbd->netdev = netdev;
netdev->netdev_ops = &fbnic_netdev_ops;
fbn = netdev_priv(netdev);
fbn->netdev = netdev;
fbn->fbd = fbd;
INIT_LIST_HEAD(&fbn->napis);
fbn->txq_size = FBNIC_TXQ_SIZE_DEFAULT;
default_queues = netif_get_num_default_rss_queues();
if (default_queues > fbd->max_num_queues)
default_queues = fbd->max_num_queues;
fbnic_reset_queues(fbn, default_queues, default_queues);
netdev->min_mtu = IPV6_MIN_MTU;
netdev->max_mtu = FBNIC_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
netif_carrier_off(netdev);
netif_tx_stop_all_queues(netdev);
return netdev;
}
static int fbnic_dsn_to_mac_addr(u64 dsn, char *addr)
{
addr[0] = (dsn >> 56) & 0xFF;
addr[1] = (dsn >> 48) & 0xFF;
addr[2] = (dsn >> 40) & 0xFF;
addr[3] = (dsn >> 16) & 0xFF;
addr[4] = (dsn >> 8) & 0xFF;
addr[5] = dsn & 0xFF;
return is_valid_ether_addr(addr) ? 0 : -EINVAL;
}
/**
* fbnic_netdev_register - Initialize general software structures
* @netdev: Netdev containing structure to initialize and register
*
* Initialize the MAC address for the netdev and register it.
*
* Return: 0 on success, negative on failure
**/
int fbnic_netdev_register(struct net_device *netdev)
{
struct fbnic_net *fbn = netdev_priv(netdev);
struct fbnic_dev *fbd = fbn->fbd;
u64 dsn = fbd->dsn;
u8 addr[ETH_ALEN];
int err;
err = fbnic_dsn_to_mac_addr(dsn, addr);
if (!err) {
ether_addr_copy(netdev->perm_addr, addr);
eth_hw_addr_set(netdev, addr);
} else {
/* A randomly assigned MAC address will cause provisioning
* issues so instead just fail to spawn the netdev and
* avoid any confusion.
*/
dev_err(fbd->dev, "MAC addr %pM invalid\n", addr);
return err;
}
return register_netdev(netdev);
}
void fbnic_netdev_unregister(struct net_device *netdev)
{
unregister_netdev(netdev);
}
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