357 lines
8.5 KiB
C
357 lines
8.5 KiB
C
/* drivers/net/ifb.c:
|
|
|
|
The purpose of this driver is to provide a device that allows
|
|
for sharing of resources:
|
|
|
|
1) qdiscs/policies that are per device as opposed to system wide.
|
|
ifb allows for a device which can be redirected to thus providing
|
|
an impression of sharing.
|
|
|
|
2) Allows for queueing incoming traffic for shaping instead of
|
|
dropping.
|
|
|
|
The original concept is based on what is known as the IMQ
|
|
driver initially written by Martin Devera, later rewritten
|
|
by Patrick McHardy and then maintained by Andre Correa.
|
|
|
|
You need the tc action mirror or redirect to feed this device
|
|
packets.
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version
|
|
2 of the License, or (at your option) any later version.
|
|
|
|
Authors: Jamal Hadi Salim (2005)
|
|
|
|
*/
|
|
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <net/pkt_sched.h>
|
|
#include <net/net_namespace.h>
|
|
|
|
#define TX_Q_LIMIT 32
|
|
struct ifb_q_private {
|
|
struct net_device *dev;
|
|
struct tasklet_struct ifb_tasklet;
|
|
int tasklet_pending;
|
|
int txqnum;
|
|
struct sk_buff_head rq;
|
|
u64 rx_packets;
|
|
u64 rx_bytes;
|
|
struct u64_stats_sync rsync;
|
|
|
|
struct u64_stats_sync tsync;
|
|
u64 tx_packets;
|
|
u64 tx_bytes;
|
|
struct sk_buff_head tq;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
struct ifb_dev_private {
|
|
struct ifb_q_private *tx_private;
|
|
};
|
|
|
|
static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev);
|
|
static int ifb_open(struct net_device *dev);
|
|
static int ifb_close(struct net_device *dev);
|
|
|
|
static void ifb_ri_tasklet(unsigned long _txp)
|
|
{
|
|
struct ifb_q_private *txp = (struct ifb_q_private *)_txp;
|
|
struct netdev_queue *txq;
|
|
struct sk_buff *skb;
|
|
|
|
txq = netdev_get_tx_queue(txp->dev, txp->txqnum);
|
|
skb = skb_peek(&txp->tq);
|
|
if (!skb) {
|
|
if (!__netif_tx_trylock(txq))
|
|
goto resched;
|
|
skb_queue_splice_tail_init(&txp->rq, &txp->tq);
|
|
__netif_tx_unlock(txq);
|
|
}
|
|
|
|
while ((skb = __skb_dequeue(&txp->tq)) != NULL) {
|
|
skb->tc_redirected = 0;
|
|
skb->tc_skip_classify = 1;
|
|
|
|
u64_stats_update_begin(&txp->tsync);
|
|
txp->tx_packets++;
|
|
txp->tx_bytes += skb->len;
|
|
u64_stats_update_end(&txp->tsync);
|
|
|
|
rcu_read_lock();
|
|
skb->dev = dev_get_by_index_rcu(dev_net(txp->dev), skb->skb_iif);
|
|
if (!skb->dev) {
|
|
rcu_read_unlock();
|
|
dev_kfree_skb(skb);
|
|
txp->dev->stats.tx_dropped++;
|
|
if (skb_queue_len(&txp->tq) != 0)
|
|
goto resched;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
skb->skb_iif = txp->dev->ifindex;
|
|
|
|
if (!skb->tc_from_ingress) {
|
|
dev_queue_xmit(skb);
|
|
} else {
|
|
skb_pull(skb, skb->mac_len);
|
|
netif_receive_skb(skb);
|
|
}
|
|
}
|
|
|
|
if (__netif_tx_trylock(txq)) {
|
|
skb = skb_peek(&txp->rq);
|
|
if (!skb) {
|
|
txp->tasklet_pending = 0;
|
|
if (netif_tx_queue_stopped(txq))
|
|
netif_tx_wake_queue(txq);
|
|
} else {
|
|
__netif_tx_unlock(txq);
|
|
goto resched;
|
|
}
|
|
__netif_tx_unlock(txq);
|
|
} else {
|
|
resched:
|
|
txp->tasklet_pending = 1;
|
|
tasklet_schedule(&txp->ifb_tasklet);
|
|
}
|
|
|
|
}
|
|
|
|
static void ifb_stats64(struct net_device *dev,
|
|
struct rtnl_link_stats64 *stats)
|
|
{
|
|
struct ifb_dev_private *dp = netdev_priv(dev);
|
|
struct ifb_q_private *txp = dp->tx_private;
|
|
unsigned int start;
|
|
u64 packets, bytes;
|
|
int i;
|
|
|
|
for (i = 0; i < dev->num_tx_queues; i++,txp++) {
|
|
do {
|
|
start = u64_stats_fetch_begin_irq(&txp->rsync);
|
|
packets = txp->rx_packets;
|
|
bytes = txp->rx_bytes;
|
|
} while (u64_stats_fetch_retry_irq(&txp->rsync, start));
|
|
stats->rx_packets += packets;
|
|
stats->rx_bytes += bytes;
|
|
|
|
do {
|
|
start = u64_stats_fetch_begin_irq(&txp->tsync);
|
|
packets = txp->tx_packets;
|
|
bytes = txp->tx_bytes;
|
|
} while (u64_stats_fetch_retry_irq(&txp->tsync, start));
|
|
stats->tx_packets += packets;
|
|
stats->tx_bytes += bytes;
|
|
}
|
|
stats->rx_dropped = dev->stats.rx_dropped;
|
|
stats->tx_dropped = dev->stats.tx_dropped;
|
|
}
|
|
|
|
static int ifb_dev_init(struct net_device *dev)
|
|
{
|
|
struct ifb_dev_private *dp = netdev_priv(dev);
|
|
struct ifb_q_private *txp;
|
|
int i;
|
|
|
|
txp = kcalloc(dev->num_tx_queues, sizeof(*txp), GFP_KERNEL);
|
|
if (!txp)
|
|
return -ENOMEM;
|
|
dp->tx_private = txp;
|
|
for (i = 0; i < dev->num_tx_queues; i++,txp++) {
|
|
txp->txqnum = i;
|
|
txp->dev = dev;
|
|
__skb_queue_head_init(&txp->rq);
|
|
__skb_queue_head_init(&txp->tq);
|
|
u64_stats_init(&txp->rsync);
|
|
u64_stats_init(&txp->tsync);
|
|
tasklet_init(&txp->ifb_tasklet, ifb_ri_tasklet,
|
|
(unsigned long)txp);
|
|
netif_tx_start_queue(netdev_get_tx_queue(dev, i));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops ifb_netdev_ops = {
|
|
.ndo_open = ifb_open,
|
|
.ndo_stop = ifb_close,
|
|
.ndo_get_stats64 = ifb_stats64,
|
|
.ndo_start_xmit = ifb_xmit,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
.ndo_init = ifb_dev_init,
|
|
};
|
|
|
|
#define IFB_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST | \
|
|
NETIF_F_TSO_ECN | NETIF_F_TSO | NETIF_F_TSO6 | \
|
|
NETIF_F_GSO_ENCAP_ALL | \
|
|
NETIF_F_HIGHDMA | NETIF_F_HW_VLAN_CTAG_TX | \
|
|
NETIF_F_HW_VLAN_STAG_TX)
|
|
|
|
static void ifb_dev_free(struct net_device *dev)
|
|
{
|
|
struct ifb_dev_private *dp = netdev_priv(dev);
|
|
struct ifb_q_private *txp = dp->tx_private;
|
|
int i;
|
|
|
|
for (i = 0; i < dev->num_tx_queues; i++,txp++) {
|
|
tasklet_kill(&txp->ifb_tasklet);
|
|
__skb_queue_purge(&txp->rq);
|
|
__skb_queue_purge(&txp->tq);
|
|
}
|
|
kfree(dp->tx_private);
|
|
free_netdev(dev);
|
|
}
|
|
|
|
static void ifb_setup(struct net_device *dev)
|
|
{
|
|
/* Initialize the device structure. */
|
|
dev->netdev_ops = &ifb_netdev_ops;
|
|
|
|
/* Fill in device structure with ethernet-generic values. */
|
|
ether_setup(dev);
|
|
dev->tx_queue_len = TX_Q_LIMIT;
|
|
|
|
dev->features |= IFB_FEATURES;
|
|
dev->hw_features |= dev->features;
|
|
dev->hw_enc_features |= dev->features;
|
|
dev->vlan_features |= IFB_FEATURES & ~(NETIF_F_HW_VLAN_CTAG_TX |
|
|
NETIF_F_HW_VLAN_STAG_TX);
|
|
|
|
dev->flags |= IFF_NOARP;
|
|
dev->flags &= ~IFF_MULTICAST;
|
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
|
|
netif_keep_dst(dev);
|
|
eth_hw_addr_random(dev);
|
|
dev->destructor = ifb_dev_free;
|
|
}
|
|
|
|
static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ifb_dev_private *dp = netdev_priv(dev);
|
|
struct ifb_q_private *txp = dp->tx_private + skb_get_queue_mapping(skb);
|
|
|
|
u64_stats_update_begin(&txp->rsync);
|
|
txp->rx_packets++;
|
|
txp->rx_bytes += skb->len;
|
|
u64_stats_update_end(&txp->rsync);
|
|
|
|
if (!skb->tc_redirected || !skb->skb_iif) {
|
|
dev_kfree_skb(skb);
|
|
dev->stats.rx_dropped++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
if (skb_queue_len(&txp->rq) >= dev->tx_queue_len)
|
|
netif_tx_stop_queue(netdev_get_tx_queue(dev, txp->txqnum));
|
|
|
|
__skb_queue_tail(&txp->rq, skb);
|
|
if (!txp->tasklet_pending) {
|
|
txp->tasklet_pending = 1;
|
|
tasklet_schedule(&txp->ifb_tasklet);
|
|
}
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static int ifb_close(struct net_device *dev)
|
|
{
|
|
netif_tx_stop_all_queues(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int ifb_open(struct net_device *dev)
|
|
{
|
|
netif_tx_start_all_queues(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int ifb_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
|
|
return -EINVAL;
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct rtnl_link_ops ifb_link_ops __read_mostly = {
|
|
.kind = "ifb",
|
|
.priv_size = sizeof(struct ifb_dev_private),
|
|
.setup = ifb_setup,
|
|
.validate = ifb_validate,
|
|
};
|
|
|
|
/* Number of ifb devices to be set up by this module.
|
|
* Note that these legacy devices have one queue.
|
|
* Prefer something like : ip link add ifb10 numtxqueues 8 type ifb
|
|
*/
|
|
static int numifbs = 2;
|
|
module_param(numifbs, int, 0);
|
|
MODULE_PARM_DESC(numifbs, "Number of ifb devices");
|
|
|
|
static int __init ifb_init_one(int index)
|
|
{
|
|
struct net_device *dev_ifb;
|
|
int err;
|
|
|
|
dev_ifb = alloc_netdev(sizeof(struct ifb_dev_private), "ifb%d",
|
|
NET_NAME_UNKNOWN, ifb_setup);
|
|
|
|
if (!dev_ifb)
|
|
return -ENOMEM;
|
|
|
|
dev_ifb->rtnl_link_ops = &ifb_link_ops;
|
|
err = register_netdevice(dev_ifb);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
free_netdev(dev_ifb);
|
|
return err;
|
|
}
|
|
|
|
static int __init ifb_init_module(void)
|
|
{
|
|
int i, err;
|
|
|
|
rtnl_lock();
|
|
err = __rtnl_link_register(&ifb_link_ops);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
for (i = 0; i < numifbs && !err; i++) {
|
|
err = ifb_init_one(i);
|
|
cond_resched();
|
|
}
|
|
if (err)
|
|
__rtnl_link_unregister(&ifb_link_ops);
|
|
|
|
out:
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit ifb_cleanup_module(void)
|
|
{
|
|
rtnl_link_unregister(&ifb_link_ops);
|
|
}
|
|
|
|
module_init(ifb_init_module);
|
|
module_exit(ifb_cleanup_module);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Jamal Hadi Salim");
|
|
MODULE_ALIAS_RTNL_LINK("ifb");
|