2006-09-13 19:24:59 +02:00
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/* drivers/net/ifb.c:
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2006-01-09 07:34:25 +01:00
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The purpose of this driver is to provide a device that allows
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for sharing of resources:
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1) qdiscs/policies that are per device as opposed to system wide.
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ifb allows for a device which can be redirected to thus providing
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an impression of sharing.
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2) Allows for queueing incoming traffic for shaping instead of
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2006-09-13 19:24:59 +02:00
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dropping.
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2006-01-09 07:34:25 +01:00
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The original concept is based on what is known as the IMQ
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driver initially written by Martin Devera, later rewritten
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by Patrick McHardy and then maintained by Andre Correa.
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You need the tc action mirror or redirect to feed this device
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packets.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version
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2 of the License, or (at your option) any later version.
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2006-09-13 19:24:59 +02:00
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2006-01-09 07:34:25 +01:00
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Authors: Jamal Hadi Salim (2005)
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2006-09-13 19:24:59 +02:00
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2006-01-09 07:34:25 +01:00
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/init.h>
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2011-06-06 12:43:46 +02:00
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#include <linux/interrupt.h>
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2006-01-09 07:34:25 +01:00
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#include <linux/moduleparam.h>
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2006-09-13 19:24:59 +02:00
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#include <net/pkt_sched.h>
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2007-09-17 20:56:21 +02:00
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#include <net/net_namespace.h>
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2006-01-09 07:34:25 +01:00
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#define TX_Q_LIMIT 32
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struct ifb_private {
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struct tasklet_struct ifb_tasklet;
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int tasklet_pending;
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2011-06-20 13:42:30 +02:00
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struct u64_stats_sync rsync;
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2006-01-09 07:34:25 +01:00
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struct sk_buff_head rq;
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2011-06-20 13:42:30 +02:00
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u64 rx_packets;
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u64 rx_bytes;
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struct u64_stats_sync tsync;
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2006-01-09 07:34:25 +01:00
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struct sk_buff_head tq;
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2011-06-20 13:42:30 +02:00
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u64 tx_packets;
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u64 tx_bytes;
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2006-01-09 07:34:25 +01:00
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};
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2006-02-24 01:23:51 +01:00
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static int numifbs = 2;
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2006-01-09 07:34:25 +01:00
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static void ri_tasklet(unsigned long dev);
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2009-08-31 21:50:51 +02:00
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static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev);
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2006-01-09 07:34:25 +01:00
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static int ifb_open(struct net_device *dev);
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static int ifb_close(struct net_device *dev);
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2006-09-13 19:24:59 +02:00
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static void ri_tasklet(unsigned long dev)
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2006-01-09 07:34:25 +01:00
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{
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struct net_device *_dev = (struct net_device *)dev;
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struct ifb_private *dp = netdev_priv(_dev);
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2008-08-01 01:58:50 +02:00
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struct netdev_queue *txq;
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2006-01-09 07:34:25 +01:00
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struct sk_buff *skb;
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2008-08-01 01:58:50 +02:00
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txq = netdev_get_tx_queue(_dev, 0);
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2006-01-09 07:34:25 +01:00
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if ((skb = skb_peek(&dp->tq)) == NULL) {
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2008-08-01 01:58:50 +02:00
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if (__netif_tx_trylock(txq)) {
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2010-12-04 16:01:52 +01:00
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skb_queue_splice_tail_init(&dp->rq, &dp->tq);
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2008-08-01 01:58:50 +02:00
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__netif_tx_unlock(txq);
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2006-01-09 07:34:25 +01:00
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} else {
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/* reschedule */
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goto resched;
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}
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}
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2010-12-16 00:52:55 +01:00
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while ((skb = __skb_dequeue(&dp->tq)) != NULL) {
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2006-01-09 07:34:25 +01:00
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u32 from = G_TC_FROM(skb->tc_verd);
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skb->tc_verd = 0;
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skb->tc_verd = SET_TC_NCLS(skb->tc_verd);
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2011-06-20 13:42:30 +02:00
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u64_stats_update_begin(&dp->tsync);
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dp->tx_packets++;
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dp->tx_bytes += skb->len;
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u64_stats_update_end(&dp->tsync);
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2007-03-29 20:46:52 +02:00
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2009-11-01 20:45:16 +01:00
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rcu_read_lock();
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2013-01-13 08:46:34 +01:00
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skb->dev = dev_get_by_index_rcu(dev_net(_dev), skb->skb_iif);
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2007-03-29 20:46:52 +02:00
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if (!skb->dev) {
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2009-11-01 20:45:16 +01:00
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rcu_read_unlock();
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2007-03-29 20:46:52 +02:00
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dev_kfree_skb(skb);
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2011-06-20 13:42:30 +02:00
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_dev->stats.tx_dropped++;
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2010-12-04 15:09:08 +01:00
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if (skb_queue_len(&dp->tq) != 0)
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goto resched;
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2007-03-29 20:46:52 +02:00
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break;
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}
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2009-11-01 20:45:16 +01:00
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rcu_read_unlock();
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2009-11-21 00:35:04 +01:00
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skb->skb_iif = _dev->ifindex;
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2007-03-29 20:46:52 +02:00
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2006-01-09 07:34:25 +01:00
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if (from & AT_EGRESS) {
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dev_queue_xmit(skb);
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} else if (from & AT_INGRESS) {
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2007-03-29 20:46:52 +02:00
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skb_pull(skb, skb->dev->hard_header_len);
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2010-12-14 23:39:58 +01:00
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netif_receive_skb(skb);
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2007-03-29 20:46:52 +02:00
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} else
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BUG();
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2006-01-09 07:34:25 +01:00
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}
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2008-08-01 01:58:50 +02:00
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if (__netif_tx_trylock(txq)) {
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2006-01-09 07:34:25 +01:00
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if ((skb = skb_peek(&dp->rq)) == NULL) {
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dp->tasklet_pending = 0;
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if (netif_queue_stopped(_dev))
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netif_wake_queue(_dev);
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} else {
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2008-08-01 01:58:50 +02:00
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__netif_tx_unlock(txq);
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2006-01-09 07:34:25 +01:00
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goto resched;
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}
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2008-08-01 01:58:50 +02:00
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__netif_tx_unlock(txq);
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2006-01-09 07:34:25 +01:00
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} else {
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resched:
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dp->tasklet_pending = 1;
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tasklet_schedule(&dp->ifb_tasklet);
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}
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}
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2011-06-20 13:42:30 +02:00
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static struct rtnl_link_stats64 *ifb_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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struct ifb_private *dp = netdev_priv(dev);
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unsigned int start;
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do {
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start = u64_stats_fetch_begin_bh(&dp->rsync);
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stats->rx_packets = dp->rx_packets;
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stats->rx_bytes = dp->rx_bytes;
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} while (u64_stats_fetch_retry_bh(&dp->rsync, start));
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do {
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start = u64_stats_fetch_begin_bh(&dp->tsync);
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stats->tx_packets = dp->tx_packets;
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stats->tx_bytes = dp->tx_bytes;
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} while (u64_stats_fetch_retry_bh(&dp->tsync, start));
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stats->rx_dropped = dev->stats.rx_dropped;
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stats->tx_dropped = dev->stats.tx_dropped;
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return stats;
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}
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2008-11-20 06:47:07 +01:00
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static const struct net_device_ops ifb_netdev_ops = {
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.ndo_open = ifb_open,
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.ndo_stop = ifb_close,
|
2011-06-20 13:42:30 +02:00
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.ndo_get_stats64 = ifb_stats64,
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2008-11-21 05:14:53 +01:00
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.ndo_start_xmit = ifb_xmit,
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.ndo_validate_addr = eth_validate_addr,
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2008-11-20 06:47:07 +01:00
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};
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2011-11-15 16:29:55 +01:00
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#define IFB_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST | \
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ifb: add performance flags
Le lundi 03 janvier 2011 à 11:40 -0800, David Miller a écrit :
> From: Jarek Poplawski <jarkao2@gmail.com>
> Date: Mon, 3 Jan 2011 20:37:03 +0100
>
> > On Sun, Jan 02, 2011 at 09:24:36PM +0100, Eric Dumazet wrote:
> >> Le mercredi 29 décembre 2010 ?? 00:07 +0100, Jarek Poplawski a écrit :
> >>
> >> > Ingress is before vlans handler so these features and the
> >> > NETIF_F_HW_VLAN_TX flag seem useful for ifb considering
> >> > dev_hard_start_xmit() checks.
> >>
> >> OK, here is v2 of the patch then, thanks everybody.
> >>
> >>
> >> [PATCH v2 net-next-2.6] ifb: add performance flags
> >>
> >> IFB can use the full set of features flags (NETIF_F_SG |
> >> NETIF_F_FRAGLIST | NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA) to
> >> avoid unnecessary split of some packets (GRO for example)
> >>
> >> Changli suggested to also set vlan_features,
> >
> > He also suggested more GSO flags of which especially NETIF_F_TSO6
> > seems interesting (wrt GRO)?
>
> I think at least TSO6 would very much be appropriate here.
Yes, why not, I am only wondering why loopback / dummy (and others ?)
only set NETIF_F_TSO :)
Since I want to play with ECN, I might also add NETIF_F_TSO_ECN ;)
For other flags, I really doubt it can matter on ifb ?
[PATCH v3 net-next-2.6] ifb: add performance flags
IFB can use the full set of features flags (NETIF_F_SG |
NETIF_F_FRAGLIST | NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA) to
avoid unnecessary split of some packets (GRO for example)
Changli suggested to also set vlan_features, NETIF_F_TSO6,
NETIF_F_TSO_ECN.
Jarek suggested to add NETIF_F_HW_VLAN_TX as well.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Changli Gao <xiaosuo@gmail.com>
Cc: Jarek Poplawski <jarkao2@gmail.com>
Cc: Pawel Staszewski <pstaszewski@itcare.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-03 11:35:22 +01:00
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NETIF_F_TSO_ECN | NETIF_F_TSO | NETIF_F_TSO6 | \
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2013-04-19 04:04:32 +02:00
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NETIF_F_HIGHDMA | NETIF_F_HW_VLAN_CTAG_TX | \
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NETIF_F_HW_VLAN_STAG_TX)
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ifb: add performance flags
Le lundi 03 janvier 2011 à 11:40 -0800, David Miller a écrit :
> From: Jarek Poplawski <jarkao2@gmail.com>
> Date: Mon, 3 Jan 2011 20:37:03 +0100
>
> > On Sun, Jan 02, 2011 at 09:24:36PM +0100, Eric Dumazet wrote:
> >> Le mercredi 29 décembre 2010 ?? 00:07 +0100, Jarek Poplawski a écrit :
> >>
> >> > Ingress is before vlans handler so these features and the
> >> > NETIF_F_HW_VLAN_TX flag seem useful for ifb considering
> >> > dev_hard_start_xmit() checks.
> >>
> >> OK, here is v2 of the patch then, thanks everybody.
> >>
> >>
> >> [PATCH v2 net-next-2.6] ifb: add performance flags
> >>
> >> IFB can use the full set of features flags (NETIF_F_SG |
> >> NETIF_F_FRAGLIST | NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA) to
> >> avoid unnecessary split of some packets (GRO for example)
> >>
> >> Changli suggested to also set vlan_features,
> >
> > He also suggested more GSO flags of which especially NETIF_F_TSO6
> > seems interesting (wrt GRO)?
>
> I think at least TSO6 would very much be appropriate here.
Yes, why not, I am only wondering why loopback / dummy (and others ?)
only set NETIF_F_TSO :)
Since I want to play with ECN, I might also add NETIF_F_TSO_ECN ;)
For other flags, I really doubt it can matter on ifb ?
[PATCH v3 net-next-2.6] ifb: add performance flags
IFB can use the full set of features flags (NETIF_F_SG |
NETIF_F_FRAGLIST | NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA) to
avoid unnecessary split of some packets (GRO for example)
Changli suggested to also set vlan_features, NETIF_F_TSO6,
NETIF_F_TSO_ECN.
Jarek suggested to add NETIF_F_HW_VLAN_TX as well.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Changli Gao <xiaosuo@gmail.com>
Cc: Jarek Poplawski <jarkao2@gmail.com>
Cc: Pawel Staszewski <pstaszewski@itcare.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-03 11:35:22 +01:00
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2007-06-13 21:05:06 +02:00
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static void ifb_setup(struct net_device *dev)
|
2006-01-09 07:34:25 +01:00
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{
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/* Initialize the device structure. */
|
2007-06-13 21:05:06 +02:00
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dev->destructor = free_netdev;
|
2008-11-20 06:47:07 +01:00
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dev->netdev_ops = &ifb_netdev_ops;
|
2006-01-09 07:34:25 +01:00
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/* Fill in device structure with ethernet-generic values. */
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ether_setup(dev);
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|
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dev->tx_queue_len = TX_Q_LIMIT;
|
2008-11-20 06:47:07 +01:00
|
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|
ifb: add performance flags
Le lundi 03 janvier 2011 à 11:40 -0800, David Miller a écrit :
> From: Jarek Poplawski <jarkao2@gmail.com>
> Date: Mon, 3 Jan 2011 20:37:03 +0100
>
> > On Sun, Jan 02, 2011 at 09:24:36PM +0100, Eric Dumazet wrote:
> >> Le mercredi 29 décembre 2010 ?? 00:07 +0100, Jarek Poplawski a écrit :
> >>
> >> > Ingress is before vlans handler so these features and the
> >> > NETIF_F_HW_VLAN_TX flag seem useful for ifb considering
> >> > dev_hard_start_xmit() checks.
> >>
> >> OK, here is v2 of the patch then, thanks everybody.
> >>
> >>
> >> [PATCH v2 net-next-2.6] ifb: add performance flags
> >>
> >> IFB can use the full set of features flags (NETIF_F_SG |
> >> NETIF_F_FRAGLIST | NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA) to
> >> avoid unnecessary split of some packets (GRO for example)
> >>
> >> Changli suggested to also set vlan_features,
> >
> > He also suggested more GSO flags of which especially NETIF_F_TSO6
> > seems interesting (wrt GRO)?
>
> I think at least TSO6 would very much be appropriate here.
Yes, why not, I am only wondering why loopback / dummy (and others ?)
only set NETIF_F_TSO :)
Since I want to play with ECN, I might also add NETIF_F_TSO_ECN ;)
For other flags, I really doubt it can matter on ifb ?
[PATCH v3 net-next-2.6] ifb: add performance flags
IFB can use the full set of features flags (NETIF_F_SG |
NETIF_F_FRAGLIST | NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA) to
avoid unnecessary split of some packets (GRO for example)
Changli suggested to also set vlan_features, NETIF_F_TSO6,
NETIF_F_TSO_ECN.
Jarek suggested to add NETIF_F_HW_VLAN_TX as well.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Changli Gao <xiaosuo@gmail.com>
Cc: Jarek Poplawski <jarkao2@gmail.com>
Cc: Pawel Staszewski <pstaszewski@itcare.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-03 11:35:22 +01:00
|
|
|
dev->features |= IFB_FEATURES;
|
|
|
|
dev->vlan_features |= IFB_FEATURES;
|
|
|
|
|
2006-01-09 07:34:25 +01:00
|
|
|
dev->flags |= IFF_NOARP;
|
|
|
|
dev->flags &= ~IFF_MULTICAST;
|
2011-07-26 08:05:38 +02:00
|
|
|
dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
|
2012-02-15 07:45:39 +01:00
|
|
|
eth_hw_addr_random(dev);
|
2006-01-09 07:34:25 +01:00
|
|
|
}
|
|
|
|
|
2009-08-31 21:50:51 +02:00
|
|
|
static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)
|
2006-01-09 07:34:25 +01:00
|
|
|
{
|
|
|
|
struct ifb_private *dp = netdev_priv(dev);
|
|
|
|
u32 from = G_TC_FROM(skb->tc_verd);
|
|
|
|
|
2011-06-20 13:42:30 +02:00
|
|
|
u64_stats_update_begin(&dp->rsync);
|
|
|
|
dp->rx_packets++;
|
|
|
|
dp->rx_bytes += skb->len;
|
|
|
|
u64_stats_update_end(&dp->rsync);
|
2006-01-09 07:34:25 +01:00
|
|
|
|
2009-11-21 00:35:04 +01:00
|
|
|
if (!(from & (AT_INGRESS|AT_EGRESS)) || !skb->skb_iif) {
|
2006-01-09 07:34:25 +01:00
|
|
|
dev_kfree_skb(skb);
|
2011-06-20 13:42:30 +02:00
|
|
|
dev->stats.rx_dropped++;
|
2009-08-31 21:50:51 +02:00
|
|
|
return NETDEV_TX_OK;
|
2006-01-09 07:34:25 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
if (skb_queue_len(&dp->rq) >= dev->tx_queue_len) {
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
}
|
|
|
|
|
2010-12-04 16:01:52 +01:00
|
|
|
__skb_queue_tail(&dp->rq, skb);
|
2006-01-09 07:34:25 +01:00
|
|
|
if (!dp->tasklet_pending) {
|
|
|
|
dp->tasklet_pending = 1;
|
|
|
|
tasklet_schedule(&dp->ifb_tasklet);
|
|
|
|
}
|
|
|
|
|
2009-08-31 21:50:51 +02:00
|
|
|
return NETDEV_TX_OK;
|
2006-01-09 07:34:25 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
static int ifb_close(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct ifb_private *dp = netdev_priv(dev);
|
|
|
|
|
|
|
|
tasklet_kill(&dp->ifb_tasklet);
|
|
|
|
netif_stop_queue(dev);
|
2010-12-04 16:01:52 +01:00
|
|
|
__skb_queue_purge(&dp->rq);
|
|
|
|
__skb_queue_purge(&dp->tq);
|
2006-01-09 07:34:25 +01:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ifb_open(struct net_device *dev)
|
|
|
|
{
|
|
|
|
struct ifb_private *dp = netdev_priv(dev);
|
|
|
|
|
|
|
|
tasklet_init(&dp->ifb_tasklet, ri_tasklet, (unsigned long)dev);
|
2010-12-04 16:01:52 +01:00
|
|
|
__skb_queue_head_init(&dp->rq);
|
|
|
|
__skb_queue_head_init(&dp->tq);
|
2006-01-09 07:34:25 +01:00
|
|
|
netif_start_queue(dev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-07-12 04:42:31 +02:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2007-06-13 21:05:06 +02:00
|
|
|
static struct rtnl_link_ops ifb_link_ops __read_mostly = {
|
|
|
|
.kind = "ifb",
|
|
|
|
.priv_size = sizeof(struct ifb_private),
|
|
|
|
.setup = ifb_setup,
|
2007-07-12 04:42:31 +02:00
|
|
|
.validate = ifb_validate,
|
2007-06-13 21:05:06 +02:00
|
|
|
};
|
|
|
|
|
2007-07-12 04:42:13 +02:00
|
|
|
/* Number of ifb devices to be set up by this module. */
|
|
|
|
module_param(numifbs, int, 0);
|
|
|
|
MODULE_PARM_DESC(numifbs, "Number of ifb devices");
|
|
|
|
|
2006-01-09 07:34:25 +01:00
|
|
|
static int __init ifb_init_one(int index)
|
|
|
|
{
|
|
|
|
struct net_device *dev_ifb;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
dev_ifb = alloc_netdev(sizeof(struct ifb_private),
|
|
|
|
"ifb%d", ifb_setup);
|
|
|
|
|
|
|
|
if (!dev_ifb)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2007-06-13 21:05:06 +02:00
|
|
|
dev_ifb->rtnl_link_ops = &ifb_link_ops;
|
|
|
|
err = register_netdevice(dev_ifb);
|
|
|
|
if (err < 0)
|
|
|
|
goto err;
|
2008-03-21 01:05:13 +01:00
|
|
|
|
2007-06-13 21:05:06 +02:00
|
|
|
return 0;
|
2007-06-13 21:04:51 +02:00
|
|
|
|
2007-06-13 21:05:06 +02:00
|
|
|
err:
|
|
|
|
free_netdev(dev_ifb);
|
|
|
|
return err;
|
2006-09-13 19:24:59 +02:00
|
|
|
}
|
2006-01-09 07:34:25 +01:00
|
|
|
|
|
|
|
static int __init ifb_init_module(void)
|
2006-09-13 19:24:59 +02:00
|
|
|
{
|
2007-06-13 21:05:06 +02:00
|
|
|
int i, err;
|
|
|
|
|
|
|
|
rtnl_lock();
|
|
|
|
err = __rtnl_link_register(&ifb_link_ops);
|
2007-06-13 21:04:51 +02:00
|
|
|
|
2006-01-09 07:34:25 +01:00
|
|
|
for (i = 0; i < numifbs && !err; i++)
|
2006-09-13 19:24:59 +02:00
|
|
|
err = ifb_init_one(i);
|
2007-07-12 04:42:13 +02:00
|
|
|
if (err)
|
2007-06-13 21:05:06 +02:00
|
|
|
__rtnl_link_unregister(&ifb_link_ops);
|
|
|
|
rtnl_unlock();
|
2006-01-09 07:34:25 +01:00
|
|
|
|
|
|
|
return err;
|
2006-09-13 19:24:59 +02:00
|
|
|
}
|
2006-01-09 07:34:25 +01:00
|
|
|
|
|
|
|
static void __exit ifb_cleanup_module(void)
|
|
|
|
{
|
2007-07-12 04:42:13 +02:00
|
|
|
rtnl_link_unregister(&ifb_link_ops);
|
2006-01-09 07:34:25 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(ifb_init_module);
|
|
|
|
module_exit(ifb_cleanup_module);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim");
|
2007-06-13 21:05:06 +02:00
|
|
|
MODULE_ALIAS_RTNL_LINK("ifb");
|