Release 4.10 drivers/net/ifb.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) {
		u32 from = G_TC_FROM(skb->tc_verd);

		skb->tc_verd = 0;
		skb->tc_verd = SET_TC_NCLS(skb->tc_verd);

		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 (from & AT_EGRESS) {
			dev_queue_xmit(skb);
		} else if (from & AT_INGRESS) {
			skb_pull(skb, skb->mac_len);
			netif_receive_skb(skb);
		} else
			BUG();
	}

	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);
	}

}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jamal hadi salim
jamal hadi salim
193
53.61%
1
6.67%
eric dumazet
eric dumazet
69
19.17%
7
46.67%
patrick mchardy
patrick mchardy
42
11.67%
1
6.67%
david s. miller
david s. miller
22
6.11%
1
6.67%
stephen hemminger
stephen hemminger
16
4.44%
1
6.67%
changli gao
changli gao
16
4.44%
2
13.33%
eric w. biederman
eric w. biederman
1
0.28%
1
6.67%
herbert xu
herbert xu
1
0.28%
1
6.67%
Total
360
100.00%
15
100.00%



static struct rtnl_link_stats64 *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;

	return stats;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
stephen hemminger
stephen hemminger
114
59.38%
1
33.33%
eric dumazet
eric dumazet
74
38.54%
1
33.33%
eric w. biederman
eric w. biederman
4
2.08%
1
33.33%
Total
192
100.00%
3
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric dumazet
eric dumazet
154
100.00%
1
100.00%
Total
154
100.00%
1
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric dumazet
eric dumazet
75
84.27%
1
33.33%
jamal hadi salim
jamal hadi salim
13
14.61%
1
33.33%
stephen hemminger
stephen hemminger
1
1.12%
1
33.33%
Total
89
100.00%
3
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
eric dumazet
eric dumazet
56
54.90%
5
45.45%
jamal hadi salim
jamal hadi salim
34
33.33%
1
9.09%
vlad yasevich
vlad yasevich
7
6.86%
1
9.09%
stephen hemminger
stephen hemminger
2
1.96%
1
9.09%
danny kukawka
danny kukawka
1
0.98%
1
9.09%
patrick mchardy
patrick mchardy
1
0.98%
1
9.09%
neil horman
neil horman
1
0.98%
1
9.09%
Total
102
100.00%
11
100.00%



static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct ifb_dev_private *dp = netdev_priv(dev);
	u32 from = G_TC_FROM(skb->tc_verd);
	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 (!(from & (AT_INGRESS|AT_EGRESS)) || !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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jamal hadi salim
jamal hadi salim
112
63.64%
1
12.50%
eric dumazet
eric dumazet
33
18.75%
2
25.00%
stephen hemminger
stephen hemminger
20
11.36%
2
25.00%
patrick mchardy
patrick mchardy
8
4.55%
1
12.50%
dean gaudet
dean gaudet
2
1.14%
1
12.50%
changli gao
changli gao
1
0.57%
1
12.50%
Total
176
100.00%
8
100.00%



static int ifb_close(struct net_device *dev)
{
	netif_tx_stop_all_queues(dev);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jamal hadi salim
jamal hadi salim
18
94.74%
1
50.00%
eric dumazet
eric dumazet
1
5.26%
1
50.00%
Total
19
100.00%
2
100.00%



static int ifb_open(struct net_device *dev)
{
	netif_tx_start_all_queues(dev);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jamal hadi salim
jamal hadi salim
18
94.74%
1
50.00%
eric dumazet
eric dumazet
1
5.26%
1
50.00%
Total
19
100.00%
2
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
patrick mchardy
patrick mchardy
64
100.00%
1
100.00%
Total
64
100.00%
1
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jamal hadi salim
jamal hadi salim
50
62.50%
1
25.00%
patrick mchardy
patrick mchardy
27
33.75%
1
25.00%
tom gundersen
tom gundersen
2
2.50%
1
25.00%
eric dumazet
eric dumazet
1
1.25%
1
25.00%
Total
80
100.00%
4
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jamal hadi salim
jamal hadi salim
44
55.00%
1
25.00%
patrick mchardy
patrick mchardy
20
25.00%
1
25.00%
ding tianhong
ding tianhong
16
20.00%
2
50.00%
Total
80
100.00%
4
100.00%



static void __exit ifb_cleanup_module(void)
{
	rtnl_link_unregister(&ifb_link_ops);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jamal hadi salim
jamal hadi salim
9
60.00%
1
33.33%
patrick mchardy
patrick mchardy
6
40.00%
2
66.67%
Total
15
100.00%
3
100.00%


module_init(ifb_init_module);

module_exit(ifb_cleanup_module);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jamal Hadi Salim");
MODULE_ALIAS_RTNL_LINK("ifb");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
jamal hadi salim
jamal hadi salim
588
36.80%
1
2.86%
eric dumazet
eric dumazet
506
31.66%
11
31.43%
patrick mchardy
patrick mchardy
220
13.77%
4
11.43%
stephen hemminger
stephen hemminger
203
12.70%
4
11.43%
david s. miller
david s. miller
22
1.38%
1
2.86%
changli gao
changli gao
17
1.06%
2
5.71%
ding tianhong
ding tianhong
16
1.00%
2
5.71%
eric w. biederman
eric w. biederman
8
0.50%
2
5.71%
vlad yasevich
vlad yasevich
7
0.44%
1
2.86%
alexey dobriyan
alexey dobriyan
3
0.19%
1
2.86%
dean gaudet
dean gaudet
2
0.13%
1
2.86%
tom gundersen
tom gundersen
2
0.13%
1
2.86%
danny kukawka
danny kukawka
1
0.06%
1
2.86%
neil horman
neil horman
1
0.06%
1
2.86%
jeff garzik
jeff garzik
1
0.06%
1
2.86%
herbert xu
herbert xu
1
0.06%
1
2.86%
Total
1598
100.00%
35
100.00%
Directory: drivers/net

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.