Commit | Line | Data |
---|---|---|
6aa20a22 | 1 | /* drivers/net/ifb.c: |
253af423 JHS |
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 | |
6aa20a22 JG |
11 | dropping. |
12 | ||
253af423 JHS |
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. | |
6aa20a22 | 24 | |
253af423 | 25 | Authors: Jamal Hadi Salim (2005) |
6aa20a22 | 26 | |
253af423 JHS |
27 | */ |
28 | ||
29 | ||
253af423 JHS |
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> | |
6aa20a22 | 36 | #include <net/pkt_sched.h> |
881d966b | 37 | #include <net/net_namespace.h> |
253af423 JHS |
38 | |
39 | #define TX_TIMEOUT (2*HZ) | |
6aa20a22 | 40 | |
253af423 JHS |
41 | #define TX_Q_LIMIT 32 |
42 | struct ifb_private { | |
253af423 JHS |
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 | ||
35eaa31e | 59 | static int numifbs = 2; |
253af423 JHS |
60 | |
61 | static void ri_tasklet(unsigned long dev); | |
62 | static int ifb_xmit(struct sk_buff *skb, struct net_device *dev); | |
253af423 JHS |
63 | static int ifb_open(struct net_device *dev); |
64 | static int ifb_close(struct net_device *dev); | |
65 | ||
6aa20a22 | 66 | static void ri_tasklet(unsigned long dev) |
253af423 JHS |
67 | { |
68 | ||
69 | struct net_device *_dev = (struct net_device *)dev; | |
70 | struct ifb_private *dp = netdev_priv(_dev); | |
09f75cd7 | 71 | struct net_device_stats *stats = &_dev->stats; |
c3f26a26 | 72 | struct netdev_queue *txq; |
253af423 JHS |
73 | struct sk_buff *skb; |
74 | ||
c3f26a26 | 75 | txq = netdev_get_tx_queue(_dev, 0); |
253af423 JHS |
76 | dp->st_task_enter++; |
77 | if ((skb = skb_peek(&dp->tq)) == NULL) { | |
78 | dp->st_txq_refl_try++; | |
c3f26a26 | 79 | if (__netif_tx_trylock(txq)) { |
253af423 JHS |
80 | dp->st_rxq_enter++; |
81 | while ((skb = skb_dequeue(&dp->rq)) != NULL) { | |
82 | skb_queue_tail(&dp->tq, skb); | |
83 | dp->st_rx2tx_tran++; | |
84 | } | |
c3f26a26 | 85 | __netif_tx_unlock(txq); |
253af423 JHS |
86 | } else { |
87 | /* reschedule */ | |
88 | dp->st_rxq_notenter++; | |
89 | goto resched; | |
90 | } | |
91 | } | |
92 | ||
93 | while ((skb = skb_dequeue(&dp->tq)) != NULL) { | |
94 | u32 from = G_TC_FROM(skb->tc_verd); | |
95 | ||
96 | skb->tc_verd = 0; | |
97 | skb->tc_verd = SET_TC_NCLS(skb->tc_verd); | |
98 | stats->tx_packets++; | |
99 | stats->tx_bytes +=skb->len; | |
c01003c2 | 100 | |
881d966b | 101 | skb->dev = __dev_get_by_index(&init_net, skb->iif); |
c01003c2 PM |
102 | if (!skb->dev) { |
103 | dev_kfree_skb(skb); | |
104 | stats->tx_dropped++; | |
105 | break; | |
106 | } | |
107 | skb->iif = _dev->ifindex; | |
108 | ||
253af423 JHS |
109 | if (from & AT_EGRESS) { |
110 | dp->st_rx_frm_egr++; | |
111 | dev_queue_xmit(skb); | |
112 | } else if (from & AT_INGRESS) { | |
253af423 | 113 | dp->st_rx_frm_ing++; |
c01003c2 | 114 | skb_pull(skb, skb->dev->hard_header_len); |
253af423 | 115 | netif_rx(skb); |
c01003c2 PM |
116 | } else |
117 | BUG(); | |
253af423 JHS |
118 | } |
119 | ||
c3f26a26 | 120 | if (__netif_tx_trylock(txq)) { |
253af423 JHS |
121 | dp->st_rxq_check++; |
122 | if ((skb = skb_peek(&dp->rq)) == NULL) { | |
123 | dp->tasklet_pending = 0; | |
124 | if (netif_queue_stopped(_dev)) | |
125 | netif_wake_queue(_dev); | |
126 | } else { | |
127 | dp->st_rxq_rsch++; | |
c3f26a26 | 128 | __netif_tx_unlock(txq); |
253af423 JHS |
129 | goto resched; |
130 | } | |
c3f26a26 | 131 | __netif_tx_unlock(txq); |
253af423 JHS |
132 | } else { |
133 | resched: | |
134 | dp->tasklet_pending = 1; | |
135 | tasklet_schedule(&dp->ifb_tasklet); | |
136 | } | |
137 | ||
138 | } | |
139 | ||
9ba2cd65 | 140 | static void ifb_setup(struct net_device *dev) |
253af423 JHS |
141 | { |
142 | /* Initialize the device structure. */ | |
253af423 JHS |
143 | dev->hard_start_xmit = ifb_xmit; |
144 | dev->open = &ifb_open; | |
145 | dev->stop = &ifb_close; | |
9ba2cd65 | 146 | dev->destructor = free_netdev; |
253af423 JHS |
147 | |
148 | /* Fill in device structure with ethernet-generic values. */ | |
149 | ether_setup(dev); | |
150 | dev->tx_queue_len = TX_Q_LIMIT; | |
151 | dev->change_mtu = NULL; | |
152 | dev->flags |= IFF_NOARP; | |
153 | dev->flags &= ~IFF_MULTICAST; | |
253af423 JHS |
154 | random_ether_addr(dev->dev_addr); |
155 | } | |
156 | ||
157 | static int ifb_xmit(struct sk_buff *skb, struct net_device *dev) | |
158 | { | |
159 | struct ifb_private *dp = netdev_priv(dev); | |
09f75cd7 | 160 | struct net_device_stats *stats = &dev->stats; |
253af423 JHS |
161 | int ret = 0; |
162 | u32 from = G_TC_FROM(skb->tc_verd); | |
163 | ||
3136dcb3 | 164 | stats->rx_packets++; |
165 | stats->rx_bytes+=skb->len; | |
253af423 | 166 | |
c01003c2 | 167 | if (!(from & (AT_INGRESS|AT_EGRESS)) || !skb->iif) { |
253af423 JHS |
168 | dev_kfree_skb(skb); |
169 | stats->rx_dropped++; | |
170 | return ret; | |
253af423 JHS |
171 | } |
172 | ||
173 | if (skb_queue_len(&dp->rq) >= dev->tx_queue_len) { | |
174 | netif_stop_queue(dev); | |
175 | } | |
176 | ||
177 | dev->trans_start = jiffies; | |
178 | skb_queue_tail(&dp->rq, skb); | |
179 | if (!dp->tasklet_pending) { | |
180 | dp->tasklet_pending = 1; | |
181 | tasklet_schedule(&dp->ifb_tasklet); | |
182 | } | |
183 | ||
184 | return ret; | |
185 | } | |
186 | ||
253af423 JHS |
187 | static int ifb_close(struct net_device *dev) |
188 | { | |
189 | struct ifb_private *dp = netdev_priv(dev); | |
190 | ||
191 | tasklet_kill(&dp->ifb_tasklet); | |
192 | netif_stop_queue(dev); | |
193 | skb_queue_purge(&dp->rq); | |
194 | skb_queue_purge(&dp->tq); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int ifb_open(struct net_device *dev) | |
199 | { | |
200 | struct ifb_private *dp = netdev_priv(dev); | |
201 | ||
202 | tasklet_init(&dp->ifb_tasklet, ri_tasklet, (unsigned long)dev); | |
203 | skb_queue_head_init(&dp->rq); | |
204 | skb_queue_head_init(&dp->tq); | |
205 | netif_start_queue(dev); | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
0e06877c PM |
210 | static int ifb_validate(struct nlattr *tb[], struct nlattr *data[]) |
211 | { | |
212 | if (tb[IFLA_ADDRESS]) { | |
213 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
214 | return -EINVAL; | |
215 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
216 | return -EADDRNOTAVAIL; | |
217 | } | |
218 | return 0; | |
219 | } | |
220 | ||
9ba2cd65 PM |
221 | static struct rtnl_link_ops ifb_link_ops __read_mostly = { |
222 | .kind = "ifb", | |
223 | .priv_size = sizeof(struct ifb_private), | |
224 | .setup = ifb_setup, | |
0e06877c | 225 | .validate = ifb_validate, |
9ba2cd65 PM |
226 | }; |
227 | ||
2d85cba2 PM |
228 | /* Number of ifb devices to be set up by this module. */ |
229 | module_param(numifbs, int, 0); | |
230 | MODULE_PARM_DESC(numifbs, "Number of ifb devices"); | |
231 | ||
253af423 JHS |
232 | static int __init ifb_init_one(int index) |
233 | { | |
234 | struct net_device *dev_ifb; | |
235 | int err; | |
236 | ||
237 | dev_ifb = alloc_netdev(sizeof(struct ifb_private), | |
238 | "ifb%d", ifb_setup); | |
239 | ||
240 | if (!dev_ifb) | |
241 | return -ENOMEM; | |
242 | ||
9ba2cd65 PM |
243 | err = dev_alloc_name(dev_ifb, dev_ifb->name); |
244 | if (err < 0) | |
245 | goto err; | |
253af423 | 246 | |
9ba2cd65 PM |
247 | dev_ifb->rtnl_link_ops = &ifb_link_ops; |
248 | err = register_netdevice(dev_ifb); | |
249 | if (err < 0) | |
250 | goto err; | |
94833dfb | 251 | |
9ba2cd65 | 252 | return 0; |
62b7ffca | 253 | |
9ba2cd65 PM |
254 | err: |
255 | free_netdev(dev_ifb); | |
256 | return err; | |
6aa20a22 | 257 | } |
253af423 JHS |
258 | |
259 | static int __init ifb_init_module(void) | |
6aa20a22 | 260 | { |
9ba2cd65 PM |
261 | int i, err; |
262 | ||
263 | rtnl_lock(); | |
264 | err = __rtnl_link_register(&ifb_link_ops); | |
62b7ffca | 265 | |
253af423 | 266 | for (i = 0; i < numifbs && !err; i++) |
6aa20a22 | 267 | err = ifb_init_one(i); |
2d85cba2 | 268 | if (err) |
9ba2cd65 | 269 | __rtnl_link_unregister(&ifb_link_ops); |
9ba2cd65 | 270 | rtnl_unlock(); |
253af423 JHS |
271 | |
272 | return err; | |
6aa20a22 | 273 | } |
253af423 JHS |
274 | |
275 | static void __exit ifb_cleanup_module(void) | |
276 | { | |
2d85cba2 | 277 | rtnl_link_unregister(&ifb_link_ops); |
253af423 JHS |
278 | } |
279 | ||
280 | module_init(ifb_init_module); | |
281 | module_exit(ifb_cleanup_module); | |
282 | MODULE_LICENSE("GPL"); | |
283 | MODULE_AUTHOR("Jamal Hadi Salim"); | |
9ba2cd65 | 284 | MODULE_ALIAS_RTNL_LINK("ifb"); |