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/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*
* RMNET Data virtual network driver
*
*/
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <net/pkt_sched.h>
#include "rmnet_config.h"
#include "rmnet_handlers.h"
#include "rmnet_private.h"
#include "rmnet_map.h"
#include "rmnet_vnd.h"
/* RX/TX Fixup */
void rmnet_vnd_rx_fixup(struct sk_buff *skb, struct net_device *dev)
{
struct rmnet_priv *priv = netdev_priv(dev);
struct rmnet_pcpu_stats *pcpu_ptr;
pcpu_ptr = this_cpu_ptr(priv->pcpu_stats);
u64_stats_update_begin(&pcpu_ptr->syncp);
pcpu_ptr->stats.rx_pkts++;
pcpu_ptr->stats.rx_bytes += skb->len;
u64_stats_update_end(&pcpu_ptr->syncp);
}
void rmnet_vnd_tx_fixup(struct sk_buff *skb, struct net_device *dev)
{
struct rmnet_priv *priv = netdev_priv(dev);
struct rmnet_pcpu_stats *pcpu_ptr;
pcpu_ptr = this_cpu_ptr(priv->pcpu_stats);
u64_stats_update_begin(&pcpu_ptr->syncp);
pcpu_ptr->stats.tx_pkts++;
pcpu_ptr->stats.tx_bytes += skb->len;
u64_stats_update_end(&pcpu_ptr->syncp);
}
/* Network Device Operations */
static netdev_tx_t rmnet_vnd_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct rmnet_priv *priv;
priv = netdev_priv(dev);
if (priv->real_dev) {
rmnet_egress_handler(skb);
} else {
this_cpu_inc(priv->pcpu_stats->stats.tx_drops);
kfree_skb(skb);
}
return NETDEV_TX_OK;
}
static int rmnet_vnd_change_mtu(struct net_device *rmnet_dev, int new_mtu)
{
if (new_mtu < 0 || new_mtu > RMNET_MAX_PACKET_SIZE)
return -EINVAL;
rmnet_dev->mtu = new_mtu;
return 0;
}
static int rmnet_vnd_get_iflink(const struct net_device *dev)
{
struct rmnet_priv *priv = netdev_priv(dev);
return priv->real_dev->ifindex;
}
static int rmnet_vnd_init(struct net_device *dev)
{
struct rmnet_priv *priv = netdev_priv(dev);
int err;
priv->pcpu_stats = alloc_percpu(struct rmnet_pcpu_stats);
if (!priv->pcpu_stats)
return -ENOMEM;
err = gro_cells_init(&priv->gro_cells, dev);
if (err) {
free_percpu(priv->pcpu_stats);
return err;
}
return 0;
}
static void rmnet_vnd_uninit(struct net_device *dev)
{
struct rmnet_priv *priv = netdev_priv(dev);
gro_cells_destroy(&priv->gro_cells);
free_percpu(priv->pcpu_stats);
}
static void rmnet_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *s)
{
struct rmnet_priv *priv = netdev_priv(dev);
struct rmnet_vnd_stats total_stats;
struct rmnet_pcpu_stats *pcpu_ptr;
unsigned int cpu, start;
memset(&total_stats, 0, sizeof(struct rmnet_vnd_stats));
for_each_possible_cpu(cpu) {
pcpu_ptr = this_cpu_ptr(priv->pcpu_stats);
do {
start = u64_stats_fetch_begin_irq(&pcpu_ptr->syncp);
total_stats.rx_pkts += pcpu_ptr->stats.rx_pkts;
total_stats.rx_bytes += pcpu_ptr->stats.rx_bytes;
total_stats.tx_pkts += pcpu_ptr->stats.tx_pkts;
total_stats.tx_bytes += pcpu_ptr->stats.tx_bytes;
} while (u64_stats_fetch_retry_irq(&pcpu_ptr->syncp, start));
total_stats.tx_drops += pcpu_ptr->stats.tx_drops;
}
s->rx_packets = total_stats.rx_pkts;
s->rx_bytes = total_stats.rx_bytes;
s->tx_packets = total_stats.tx_pkts;
s->tx_bytes = total_stats.tx_bytes;
s->tx_dropped = total_stats.tx_drops;
}
static const struct net_device_ops rmnet_vnd_ops = {
.ndo_start_xmit = rmnet_vnd_start_xmit,
.ndo_change_mtu = rmnet_vnd_change_mtu,
.ndo_get_iflink = rmnet_vnd_get_iflink,
.ndo_add_slave = rmnet_add_bridge,
.ndo_del_slave = rmnet_del_bridge,
.ndo_init = rmnet_vnd_init,
.ndo_uninit = rmnet_vnd_uninit,
.ndo_get_stats64 = rmnet_get_stats64,
};
/* Called by kernel whenever a new rmnet<n> device is created. Sets MTU,
* flags, ARP type, needed headroom, etc...
*/
void rmnet_vnd_setup(struct net_device *rmnet_dev)
{
rmnet_dev->netdev_ops = &rmnet_vnd_ops;
rmnet_dev->mtu = RMNET_DFLT_PACKET_SIZE;
rmnet_dev->needed_headroom = RMNET_NEEDED_HEADROOM;
random_ether_addr(rmnet_dev->dev_addr);
rmnet_dev->tx_queue_len = RMNET_TX_QUEUE_LEN;
/* Raw IP mode */
rmnet_dev->header_ops = NULL; /* No header */
rmnet_dev->type = ARPHRD_RAWIP;
rmnet_dev->hard_header_len = 0;
rmnet_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
rmnet_dev->needs_free_netdev = true;
}
/* Exposed API */
int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev,
struct rmnet_port *port,
struct net_device *real_dev,
struct rmnet_endpoint *ep)
{
struct rmnet_priv *priv;
int rc;
if (ep->egress_dev)
return -EINVAL;
rc = register_netdevice(rmnet_dev);
if (!rc) {
ep->egress_dev = rmnet_dev;
ep->mux_id = id;
port->nr_rmnet_devs++;
rmnet_dev->rtnl_link_ops = &rmnet_link_ops;
priv = netdev_priv(rmnet_dev);
priv->mux_id = id;
priv->real_dev = real_dev;
netdev_dbg(rmnet_dev, "rmnet dev created\n");
}
return rc;
}
int rmnet_vnd_dellink(u8 id, struct rmnet_port *port,
struct rmnet_endpoint *ep)
{
if (id >= RMNET_MAX_LOGICAL_EP || !ep->egress_dev)
return -EINVAL;
ep->egress_dev = NULL;
port->nr_rmnet_devs--;
return 0;
}
u8 rmnet_vnd_get_mux(struct net_device *rmnet_dev)
{
struct rmnet_priv *priv;
priv = netdev_priv(rmnet_dev);
return priv->mux_id;
}
int rmnet_vnd_do_flow_control(struct net_device *rmnet_dev, int enable)
{
netdev_dbg(rmnet_dev, "Setting VND TX queue state to %d\n", enable);
/* Although we expect similar number of enable/disable
* commands, optimize for the disable. That is more
* latency sensitive than enable
*/
if (unlikely(enable))
netif_wake_queue(rmnet_dev);
else
netif_stop_queue(rmnet_dev);
return 0;
}
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