Release 4.11 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) {
		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);
	}

}

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CommitProp
Jamal Hadi Salim
163
48.51%
1
5.88%
Eric Dumazet
69
20.54%
7
41.18%
Patrick McHardy
38
11.31%
1
5.88%
David S. Miller
22
6.55%
1
5.88%
Stephen Hemminger
16
4.76%
1
5.88%
Changli Gao
16
4.76%
2
11.76%
Willem de Bruijn
10
2.98%
2
11.76%
Herbert Xu
1
0.30%
1
5.88%
Eric W. Biedermann
1
0.30%
1
5.88%
Total
336
100.00%
17
100.00%



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;
}

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Stephen Hemminger
109
58.29%
2
50.00%
Eric Dumazet
74
39.57%
1
25.00%
Eric W. Biedermann
4
2.14%
1
25.00%
Total
187
100.00%
4
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;
}

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Eric Dumazet
154
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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
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Eric Dumazet
75
84.27%
1
33.33%
Jamal Hadi Salim
13
14.61%
1
33.33%
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;
}

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Eric Dumazet
56
54.90%
5
45.45%
Jamal Hadi Salim
34
33.33%
1
9.09%
Vlad Yasevich
7
6.86%
1
9.09%
Stephen Hemminger
2
1.96%
1
9.09%
Neil Horman
1
0.98%
1
9.09%
Danny Kukawka
1
0.98%
1
9.09%
Patrick McHardy
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);
	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;
}

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Jamal Hadi Salim
100
62.50%
1
11.11%
Eric Dumazet
33
20.62%
2
22.22%
Stephen Hemminger
20
12.50%
2
22.22%
Willem de Bruijn
4
2.50%
2
22.22%
Dean Gaudet
2
1.25%
1
11.11%
Changli Gao
1
0.62%
1
11.11%
Total
160
100.00%
9
100.00%



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

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Jamal Hadi Salim
18
94.74%
1
50.00%
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;
}

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Jamal Hadi Salim
18
94.74%
1
50.00%
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;
}

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1
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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;
}

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Jamal Hadi Salim
50
62.50%
1
25.00%
Patrick McHardy
27
33.75%
1
25.00%
Tom Gundersen
2
2.50%
1
25.00%
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;
}

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44
55.00%
1
25.00%
Patrick McHardy
20
25.00%
1
25.00%
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
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9
60.00%
1
33.33%
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
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Jamal Hadi Salim
546
35.16%
1
2.56%
Eric Dumazet
506
32.58%
11
28.21%
Patrick McHardy
208
13.39%
4
10.26%
Stephen Hemminger
198
12.75%
5
12.82%
David S. Miller
22
1.42%
1
2.56%
Changli Gao
17
1.09%
2
5.13%
Ding Tianhong
16
1.03%
2
5.13%
Willem de Bruijn
14
0.90%
3
7.69%
Eric W. Biedermann
8
0.52%
2
5.13%
Vlad Yasevich
7
0.45%
1
2.56%
Alexey Dobriyan
3
0.19%
1
2.56%
Tom Gundersen
2
0.13%
1
2.56%
Dean Gaudet
2
0.13%
1
2.56%
Danny Kukawka
1
0.06%
1
2.56%
Neil Horman
1
0.06%
1
2.56%
Jeff Garzik
1
0.06%
1
2.56%
Herbert Xu
1
0.06%
1
2.56%
Total
1553
100.00%
39
100.00%
Directory: drivers/net

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