diff options
| -rw-r--r-- | drivers/net/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/net/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/ifb.c | 294 |
3 files changed, 308 insertions, 0 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 733bc25..4959800 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -27,6 +27,19 @@ config NETDEVICES # that for each of the symbols. if NETDEVICES +config IFB + tristate "Intermediate Functional Block support" + depends on NET_CLS_ACT + ---help--- + This is an intermidiate driver that allows sharing of + resources. + To compile this driver as a module, choose M here: the module + will be called ifb. If you want to use more than one ifb + device at a time, you need to compile this driver as a module. + Instead of 'ifb', the devices will then be called 'ifb0', + 'ifb1' etc. + Look at the iproute2 documentation directory for usage etc + config DUMMY tristate "Dummy net driver support" ---help--- diff --git a/drivers/net/Makefile b/drivers/net/Makefile index b74a7cb..00e72b1 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -125,6 +125,7 @@ ifeq ($(CONFIG_SLIP_COMPRESSED),y) endif obj-$(CONFIG_DUMMY) += dummy.o +obj-$(CONFIG_IFB) += ifb.o obj-$(CONFIG_DE600) += de600.o obj-$(CONFIG_DE620) += de620.o obj-$(CONFIG_LANCE) += lance.o diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c new file mode 100644 index 0000000..1b69925 --- /dev/null +++ b/drivers/net/ifb.c @@ -0,0 +1,294 @@ +/* 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/config.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/init.h> +#include <linux/moduleparam.h> +#include <net/pkt_sched.h> + +#define TX_TIMEOUT (2*HZ) + +#define TX_Q_LIMIT 32 +struct ifb_private { + struct net_device_stats stats; + struct tasklet_struct ifb_tasklet; + int tasklet_pending; + /* mostly debug stats leave in for now */ + unsigned long st_task_enter; /* tasklet entered */ + unsigned long st_txq_refl_try; /* transmit queue refill attempt */ + unsigned long st_rxq_enter; /* receive queue entered */ + unsigned long st_rx2tx_tran; /* receive to trasmit transfers */ + unsigned long st_rxq_notenter; /*receiveQ not entered, resched */ + unsigned long st_rx_frm_egr; /* received from egress path */ + unsigned long st_rx_frm_ing; /* received from ingress path */ + unsigned long st_rxq_check; + unsigned long st_rxq_rsch; + struct sk_buff_head rq; + struct sk_buff_head tq; +}; + +static int numifbs = 1; + +static void ri_tasklet(unsigned long dev); +static int ifb_xmit(struct sk_buff *skb, struct net_device *dev); +static struct net_device_stats *ifb_get_stats(struct net_device *dev); +static int ifb_open(struct net_device *dev); +static int ifb_close(struct net_device *dev); + +static void ri_tasklet(unsigned long dev) +{ + + struct net_device *_dev = (struct net_device *)dev; + struct ifb_private *dp = netdev_priv(_dev); + struct net_device_stats *stats = &dp->stats; + struct sk_buff *skb; + + dp->st_task_enter++; + if ((skb = skb_peek(&dp->tq)) == NULL) { + dp->st_txq_refl_try++; + if (spin_trylock(&_dev->xmit_lock)) { + dp->st_rxq_enter++; + while ((skb = skb_dequeue(&dp->rq)) != NULL) { + skb_queue_tail(&dp->tq, skb); + dp->st_rx2tx_tran++; + } + spin_unlock(&_dev->xmit_lock); + } else { + /* reschedule */ + dp->st_rxq_notenter++; + goto resched; + } + } + + while ((skb = skb_dequeue(&dp->tq)) != NULL) { + u32 from = G_TC_FROM(skb->tc_verd); + + skb->tc_verd = 0; + skb->tc_verd = SET_TC_NCLS(skb->tc_verd); + stats->tx_packets++; + stats->tx_bytes +=skb->len; + if (from & AT_EGRESS) { + dp->st_rx_frm_egr++; + dev_queue_xmit(skb); + } else if (from & AT_INGRESS) { + + dp->st_rx_frm_ing++; + netif_rx(skb); + } else { + dev_kfree_skb(skb); + stats->tx_dropped++; + } + } + + if (spin_trylock(&_dev->xmit_lock)) { + dp->st_rxq_check++; + if ((skb = skb_peek(&dp->rq)) == NULL) { + dp->tasklet_pending = 0; + if (netif_queue_stopped(_dev)) + netif_wake_queue(_dev); + } else { + dp->st_rxq_rsch++; + spin_unlock(&_dev->xmit_lock); + goto resched; + } + spin_unlock(&_dev->xmit_lock); + } else { +resched: + dp->tasklet_pending = 1; + tasklet_schedule(&dp->ifb_tasklet); + } + +} + +static void __init ifb_setup(struct net_device *dev) +{ + /* Initialize the device structure. */ + dev->get_stats = ifb_get_stats; + dev->hard_start_xmit = ifb_xmit; + dev->open = &ifb_open; + dev->stop = &ifb_close; + + /* Fill in device structure with ethernet-generic values. */ + ether_setup(dev); + dev->tx_queue_len = TX_Q_LIMIT; + dev->change_mtu = NULL; + dev->flags |= IFF_NOARP; + dev->flags &= ~IFF_MULTICAST; + SET_MODULE_OWNER(dev); + random_ether_addr(dev->dev_addr); +} + +static int ifb_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ifb_private *dp = netdev_priv(dev); + struct net_device_stats *stats = &dp->stats; + int ret = 0; + u32 from = G_TC_FROM(skb->tc_verd); + + stats->tx_packets++; + stats->tx_bytes+=skb->len; + + if (!from || !skb->input_dev) { +dropped: + dev_kfree_skb(skb); + stats->rx_dropped++; + return ret; + } else { + /* + * note we could be going + * ingress -> egress or + * egress -> ingress + */ + skb->dev = skb->input_dev; + skb->input_dev = dev; + if (from & AT_INGRESS) { + skb_pull(skb, skb->dev->hard_header_len); + } else { + if (!(from & AT_EGRESS)) { + goto dropped; + } + } + } + + if (skb_queue_len(&dp->rq) >= dev->tx_queue_len) { + netif_stop_queue(dev); + } + + dev->trans_start = jiffies; + skb_queue_tail(&dp->rq, skb); + if (!dp->tasklet_pending) { + dp->tasklet_pending = 1; + tasklet_schedule(&dp->ifb_tasklet); + } + + return ret; +} + +static struct net_device_stats *ifb_get_stats(struct net_device *dev) +{ + struct ifb_private *dp = netdev_priv(dev); + struct net_device_stats *stats = &dp->stats; + + pr_debug("tasklets stats %ld:%ld:%ld:%ld:%ld:%ld:%ld:%ld:%ld \n", + dp->st_task_enter, dp->st_txq_refl_try, dp->st_rxq_enter, + dp->st_rx2tx_tran dp->st_rxq_notenter, dp->st_rx_frm_egr, + dp->st_rx_frm_ing, dp->st_rxq_check, dp->st_rxq_rsch ); + + return stats; +} + +static struct net_device **ifbs; + +/* Number of ifb devices to be set up by this module. */ +module_param(numifbs, int, 0); +MODULE_PARM_DESC(numifbs, "Number of ifb devices"); + +static int ifb_close(struct net_device *dev) +{ + struct ifb_private *dp = netdev_priv(dev); + + tasklet_kill(&dp->ifb_tasklet); + netif_stop_queue(dev); + skb_queue_purge(&dp->rq); + skb_queue_purge(&dp->tq); + 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); + skb_queue_head_init(&dp->rq); + skb_queue_head_init(&dp->tq); + netif_start_queue(dev); + + return 0; +} + +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; + + if ((err = register_netdev(dev_ifb))) { + free_netdev(dev_ifb); + dev_ifb = NULL; + } else { + ifbs[index] = dev_ifb; + } + + return err; +} + +static void ifb_free_one(int index) +{ + unregister_netdev(ifbs[index]); + free_netdev(ifbs[index]); +} + +static int __init ifb_init_module(void) +{ + int i, err = 0; + ifbs = kmalloc(numifbs * sizeof(void *), GFP_KERNEL); + if (!ifbs) + return -ENOMEM; + for (i = 0; i < numifbs && !err; i++) + err = ifb_init_one(i); + if (err) { + while (--i >= 0) + ifb_free_one(i); + } + + return err; +} + +static void __exit ifb_cleanup_module(void) +{ + int i; + + for (i = 0; i < numifbs; i++) + ifb_free_one(i); + kfree(ifbs); +} + +module_init(ifb_init_module); +module_exit(ifb_cleanup_module); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jamal Hadi Salim"); |
