Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1 | /* drivers/net/ifb.c: |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 2 | |
| 3 | The purpose of this driver is to provide a device that allows |
| 4 | for sharing of resources: |
| 5 | |
| 6 | 1) qdiscs/policies that are per device as opposed to system wide. |
| 7 | ifb allows for a device which can be redirected to thus providing |
| 8 | an impression of sharing. |
| 9 | |
| 10 | 2) Allows for queueing incoming traffic for shaping instead of |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 11 | dropping. |
| 12 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 13 | The original concept is based on what is known as the IMQ |
| 14 | driver initially written by Martin Devera, later rewritten |
| 15 | by Patrick McHardy and then maintained by Andre Correa. |
| 16 | |
| 17 | You need the tc action mirror or redirect to feed this device |
| 18 | packets. |
| 19 | |
| 20 | This program is free software; you can redistribute it and/or |
| 21 | modify it under the terms of the GNU General Public License |
| 22 | as published by the Free Software Foundation; either version |
| 23 | 2 of the License, or (at your option) any later version. |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 24 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 25 | Authors: Jamal Hadi Salim (2005) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 26 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 27 | */ |
| 28 | |
| 29 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 30 | #include <linux/module.h> |
| 31 | #include <linux/kernel.h> |
| 32 | #include <linux/netdevice.h> |
| 33 | #include <linux/etherdevice.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/moduleparam.h> |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 36 | #include <net/pkt_sched.h> |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 37 | #include <net/net_namespace.h> |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 38 | |
| 39 | #define TX_TIMEOUT (2*HZ) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 40 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 41 | #define TX_Q_LIMIT 32 |
| 42 | struct ifb_private { |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 43 | struct tasklet_struct ifb_tasklet; |
| 44 | int tasklet_pending; |
| 45 | /* mostly debug stats leave in for now */ |
| 46 | unsigned long st_task_enter; /* tasklet entered */ |
| 47 | unsigned long st_txq_refl_try; /* transmit queue refill attempt */ |
| 48 | unsigned long st_rxq_enter; /* receive queue entered */ |
| 49 | unsigned long st_rx2tx_tran; /* receive to trasmit transfers */ |
| 50 | unsigned long st_rxq_notenter; /*receiveQ not entered, resched */ |
| 51 | unsigned long st_rx_frm_egr; /* received from egress path */ |
| 52 | unsigned long st_rx_frm_ing; /* received from ingress path */ |
| 53 | unsigned long st_rxq_check; |
| 54 | unsigned long st_rxq_rsch; |
| 55 | struct sk_buff_head rq; |
| 56 | struct sk_buff_head tq; |
| 57 | }; |
| 58 | |
Richard Lucassen | 35eaa31 | 2006-02-23 16:23:51 -0800 | [diff] [blame] | 59 | static int numifbs = 2; |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 60 | |
| 61 | static void ri_tasklet(unsigned long dev); |
| 62 | static int ifb_xmit(struct sk_buff *skb, struct net_device *dev); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 63 | static int ifb_open(struct net_device *dev); |
| 64 | static int ifb_close(struct net_device *dev); |
| 65 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 66 | static void ri_tasklet(unsigned long dev) |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 67 | { |
| 68 | |
| 69 | struct net_device *_dev = (struct net_device *)dev; |
| 70 | struct ifb_private *dp = netdev_priv(_dev); |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame^] | 71 | struct net_device_stats *stats = &_dev->stats; |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 72 | struct sk_buff *skb; |
| 73 | |
| 74 | dp->st_task_enter++; |
| 75 | if ((skb = skb_peek(&dp->tq)) == NULL) { |
| 76 | dp->st_txq_refl_try++; |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 77 | if (netif_tx_trylock(_dev)) { |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 78 | dp->st_rxq_enter++; |
| 79 | while ((skb = skb_dequeue(&dp->rq)) != NULL) { |
| 80 | skb_queue_tail(&dp->tq, skb); |
| 81 | dp->st_rx2tx_tran++; |
| 82 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 83 | netif_tx_unlock(_dev); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 84 | } else { |
| 85 | /* reschedule */ |
| 86 | dp->st_rxq_notenter++; |
| 87 | goto resched; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | while ((skb = skb_dequeue(&dp->tq)) != NULL) { |
| 92 | u32 from = G_TC_FROM(skb->tc_verd); |
| 93 | |
| 94 | skb->tc_verd = 0; |
| 95 | skb->tc_verd = SET_TC_NCLS(skb->tc_verd); |
| 96 | stats->tx_packets++; |
| 97 | stats->tx_bytes +=skb->len; |
Patrick McHardy | c01003c | 2007-03-29 11:46:52 -0700 | [diff] [blame] | 98 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 99 | skb->dev = __dev_get_by_index(&init_net, skb->iif); |
Patrick McHardy | c01003c | 2007-03-29 11:46:52 -0700 | [diff] [blame] | 100 | if (!skb->dev) { |
| 101 | dev_kfree_skb(skb); |
| 102 | stats->tx_dropped++; |
| 103 | break; |
| 104 | } |
| 105 | skb->iif = _dev->ifindex; |
| 106 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 107 | if (from & AT_EGRESS) { |
| 108 | dp->st_rx_frm_egr++; |
| 109 | dev_queue_xmit(skb); |
| 110 | } else if (from & AT_INGRESS) { |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 111 | dp->st_rx_frm_ing++; |
Patrick McHardy | c01003c | 2007-03-29 11:46:52 -0700 | [diff] [blame] | 112 | skb_pull(skb, skb->dev->hard_header_len); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 113 | netif_rx(skb); |
Patrick McHardy | c01003c | 2007-03-29 11:46:52 -0700 | [diff] [blame] | 114 | } else |
| 115 | BUG(); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 116 | } |
| 117 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 118 | if (netif_tx_trylock(_dev)) { |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 119 | dp->st_rxq_check++; |
| 120 | if ((skb = skb_peek(&dp->rq)) == NULL) { |
| 121 | dp->tasklet_pending = 0; |
| 122 | if (netif_queue_stopped(_dev)) |
| 123 | netif_wake_queue(_dev); |
| 124 | } else { |
| 125 | dp->st_rxq_rsch++; |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 126 | netif_tx_unlock(_dev); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 127 | goto resched; |
| 128 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 129 | netif_tx_unlock(_dev); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 130 | } else { |
| 131 | resched: |
| 132 | dp->tasklet_pending = 1; |
| 133 | tasklet_schedule(&dp->ifb_tasklet); |
| 134 | } |
| 135 | |
| 136 | } |
| 137 | |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 138 | static void ifb_setup(struct net_device *dev) |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 139 | { |
| 140 | /* Initialize the device structure. */ |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 141 | dev->hard_start_xmit = ifb_xmit; |
| 142 | dev->open = &ifb_open; |
| 143 | dev->stop = &ifb_close; |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 144 | dev->destructor = free_netdev; |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 145 | |
| 146 | /* Fill in device structure with ethernet-generic values. */ |
| 147 | ether_setup(dev); |
| 148 | dev->tx_queue_len = TX_Q_LIMIT; |
| 149 | dev->change_mtu = NULL; |
| 150 | dev->flags |= IFF_NOARP; |
| 151 | dev->flags &= ~IFF_MULTICAST; |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 152 | random_ether_addr(dev->dev_addr); |
| 153 | } |
| 154 | |
| 155 | static int ifb_xmit(struct sk_buff *skb, struct net_device *dev) |
| 156 | { |
| 157 | struct ifb_private *dp = netdev_priv(dev); |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame^] | 158 | struct net_device_stats *stats = &dev->stats; |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 159 | int ret = 0; |
| 160 | u32 from = G_TC_FROM(skb->tc_verd); |
| 161 | |
dean gaudet | 3136dcb | 2007-01-01 19:39:09 -0800 | [diff] [blame] | 162 | stats->rx_packets++; |
| 163 | stats->rx_bytes+=skb->len; |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 164 | |
Patrick McHardy | c01003c | 2007-03-29 11:46:52 -0700 | [diff] [blame] | 165 | if (!(from & (AT_INGRESS|AT_EGRESS)) || !skb->iif) { |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 166 | dev_kfree_skb(skb); |
| 167 | stats->rx_dropped++; |
| 168 | return ret; |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | if (skb_queue_len(&dp->rq) >= dev->tx_queue_len) { |
| 172 | netif_stop_queue(dev); |
| 173 | } |
| 174 | |
| 175 | dev->trans_start = jiffies; |
| 176 | skb_queue_tail(&dp->rq, skb); |
| 177 | if (!dp->tasklet_pending) { |
| 178 | dp->tasklet_pending = 1; |
| 179 | tasklet_schedule(&dp->ifb_tasklet); |
| 180 | } |
| 181 | |
| 182 | return ret; |
| 183 | } |
| 184 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 185 | static int ifb_close(struct net_device *dev) |
| 186 | { |
| 187 | struct ifb_private *dp = netdev_priv(dev); |
| 188 | |
| 189 | tasklet_kill(&dp->ifb_tasklet); |
| 190 | netif_stop_queue(dev); |
| 191 | skb_queue_purge(&dp->rq); |
| 192 | skb_queue_purge(&dp->tq); |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int ifb_open(struct net_device *dev) |
| 197 | { |
| 198 | struct ifb_private *dp = netdev_priv(dev); |
| 199 | |
| 200 | tasklet_init(&dp->ifb_tasklet, ri_tasklet, (unsigned long)dev); |
| 201 | skb_queue_head_init(&dp->rq); |
| 202 | skb_queue_head_init(&dp->tq); |
| 203 | netif_start_queue(dev); |
| 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
Patrick McHardy | 0e06877 | 2007-07-11 19:42:31 -0700 | [diff] [blame] | 208 | static int ifb_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 209 | { |
| 210 | if (tb[IFLA_ADDRESS]) { |
| 211 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 212 | return -EINVAL; |
| 213 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 214 | return -EADDRNOTAVAIL; |
| 215 | } |
| 216 | return 0; |
| 217 | } |
| 218 | |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 219 | static struct rtnl_link_ops ifb_link_ops __read_mostly = { |
| 220 | .kind = "ifb", |
| 221 | .priv_size = sizeof(struct ifb_private), |
| 222 | .setup = ifb_setup, |
Patrick McHardy | 0e06877 | 2007-07-11 19:42:31 -0700 | [diff] [blame] | 223 | .validate = ifb_validate, |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 224 | }; |
| 225 | |
Patrick McHardy | 2d85cba | 2007-07-11 19:42:13 -0700 | [diff] [blame] | 226 | /* Number of ifb devices to be set up by this module. */ |
| 227 | module_param(numifbs, int, 0); |
| 228 | MODULE_PARM_DESC(numifbs, "Number of ifb devices"); |
| 229 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 230 | static int __init ifb_init_one(int index) |
| 231 | { |
| 232 | struct net_device *dev_ifb; |
| 233 | int err; |
| 234 | |
| 235 | dev_ifb = alloc_netdev(sizeof(struct ifb_private), |
| 236 | "ifb%d", ifb_setup); |
| 237 | |
| 238 | if (!dev_ifb) |
| 239 | return -ENOMEM; |
| 240 | |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 241 | err = dev_alloc_name(dev_ifb, dev_ifb->name); |
| 242 | if (err < 0) |
| 243 | goto err; |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 244 | |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 245 | dev_ifb->rtnl_link_ops = &ifb_link_ops; |
| 246 | err = register_netdevice(dev_ifb); |
| 247 | if (err < 0) |
| 248 | goto err; |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 249 | return 0; |
| 250 | |
| 251 | err: |
| 252 | free_netdev(dev_ifb); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 253 | return err; |
| 254 | } |
| 255 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 256 | static int __init ifb_init_module(void) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 257 | { |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 258 | int i, err; |
| 259 | |
| 260 | rtnl_lock(); |
| 261 | err = __rtnl_link_register(&ifb_link_ops); |
Patrick McHardy | 62b7ffc | 2007-06-13 12:04:51 -0700 | [diff] [blame] | 262 | |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 263 | for (i = 0; i < numifbs && !err; i++) |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 264 | err = ifb_init_one(i); |
Patrick McHardy | 2d85cba | 2007-07-11 19:42:13 -0700 | [diff] [blame] | 265 | if (err) |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 266 | __rtnl_link_unregister(&ifb_link_ops); |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 267 | rtnl_unlock(); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 268 | |
| 269 | return err; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 270 | } |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 271 | |
| 272 | static void __exit ifb_cleanup_module(void) |
| 273 | { |
Patrick McHardy | 2d85cba | 2007-07-11 19:42:13 -0700 | [diff] [blame] | 274 | rtnl_link_unregister(&ifb_link_ops); |
Jamal Hadi Salim | 253af42 | 2006-01-08 22:34:25 -0800 | [diff] [blame] | 275 | } |
| 276 | |
| 277 | module_init(ifb_init_module); |
| 278 | module_exit(ifb_cleanup_module); |
| 279 | MODULE_LICENSE("GPL"); |
| 280 | MODULE_AUTHOR("Jamal Hadi Salim"); |
Patrick McHardy | 9ba2cd6 | 2007-06-13 12:05:06 -0700 | [diff] [blame] | 281 | MODULE_ALIAS_RTNL_LINK("ifb"); |