Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/sch_generic.c Generic packet scheduler routines. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * Jamal Hadi Salim, <hadi@cyberus.ca> 990601 |
| 11 | * - Ingress support |
| 12 | */ |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/bitops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/skbuff.h> |
| 23 | #include <linux/rtnetlink.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/rcupdate.h> |
| 26 | #include <linux/list.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <net/pkt_sched.h> |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 29 | #include <net/dst.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | /* Main transmission queue. */ |
| 32 | |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 33 | /* Modifications to data participating in scheduling must be protected with |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 34 | * qdisc_lock(qdisc) spinlock. |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 35 | * |
| 36 | * The idea is the following: |
David S. Miller | c7e4f3b | 2008-07-16 03:22:39 -0700 | [diff] [blame] | 37 | * - enqueue, dequeue are serialized via qdisc root lock |
| 38 | * - ingress filtering is also serialized via qdisc root lock |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 39 | * - updates to tree and tree walking are only done under the rtnl mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 42 | static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 43 | { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 44 | skb_dst_force(skb); |
Jarek Poplawski | 6252352 | 2008-10-06 10:41:50 -0700 | [diff] [blame] | 45 | q->gso_skb = skb; |
Jarek Poplawski | 53e9150 | 2008-10-08 11:36:22 -0700 | [diff] [blame] | 46 | q->qstats.requeues++; |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 47 | q->q.qlen++; /* it's still part of the queue */ |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 48 | __netif_schedule(q); |
Jarek Poplawski | 6252352 | 2008-10-06 10:41:50 -0700 | [diff] [blame] | 49 | |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 50 | return 0; |
| 51 | } |
| 52 | |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 53 | static inline struct sk_buff *dequeue_skb(struct Qdisc *q) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 54 | { |
Jarek Poplawski | 554794d | 2008-10-06 09:54:39 -0700 | [diff] [blame] | 55 | struct sk_buff *skb = q->gso_skb; |
| 56 | |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 57 | if (unlikely(skb)) { |
| 58 | struct net_device *dev = qdisc_dev(q); |
| 59 | struct netdev_queue *txq; |
| 60 | |
| 61 | /* check the reason of requeuing without tx lock first */ |
| 62 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 63 | if (!netif_tx_queue_stopped(txq) && |
| 64 | !netif_tx_queue_frozen(txq)) { |
Jarek Poplawski | 6252352 | 2008-10-06 10:41:50 -0700 | [diff] [blame] | 65 | q->gso_skb = NULL; |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 66 | q->q.qlen--; |
| 67 | } else |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 68 | skb = NULL; |
| 69 | } else { |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 70 | skb = q->dequeue(q); |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 71 | } |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 72 | |
| 73 | return skb; |
| 74 | } |
| 75 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 76 | static inline int handle_dev_cpu_collision(struct sk_buff *skb, |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 77 | struct netdev_queue *dev_queue, |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 78 | struct Qdisc *q) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 79 | { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 80 | int ret; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 81 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 82 | if (unlikely(dev_queue->xmit_lock_owner == smp_processor_id())) { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 83 | /* |
| 84 | * Same CPU holding the lock. It may be a transient |
| 85 | * configuration error, when hard_start_xmit() recurses. We |
| 86 | * detect it by checking xmit owner and drop the packet when |
| 87 | * deadloop is detected. Return OK to try the next skb. |
| 88 | */ |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 89 | kfree_skb(skb); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 90 | if (net_ratelimit()) |
| 91 | printk(KERN_WARNING "Dead loop on netdevice %s, " |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 92 | "fix it urgently!\n", dev_queue->dev->name); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 93 | ret = qdisc_qlen(q); |
| 94 | } else { |
| 95 | /* |
| 96 | * Another cpu is holding lock, requeue & delay xmits for |
| 97 | * some time. |
| 98 | */ |
Changli Gao | dee4287 | 2010-05-02 05:42:16 +0000 | [diff] [blame] | 99 | __get_cpu_var(softnet_data).cpu_collision++; |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 100 | ret = dev_requeue_skb(skb, q); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 101 | } |
| 102 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 103 | return ret; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 104 | } |
| 105 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 106 | /* |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 107 | * Transmit one skb, and handle the return status as required. Holding the |
| 108 | * __QDISC_STATE_RUNNING bit guarantees that only one CPU can execute this |
| 109 | * function. |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 110 | * |
| 111 | * Returns to the caller: |
| 112 | * 0 - queue is empty or throttled. |
| 113 | * >0 - queue is not empty. |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 114 | */ |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 115 | int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
| 116 | struct net_device *dev, struct netdev_queue *txq, |
| 117 | spinlock_t *root_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | { |
Peter P Waskiewicz Jr | 5f1a485 | 2007-11-13 20:40:55 -0800 | [diff] [blame] | 119 | int ret = NETDEV_TX_BUSY; |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 120 | |
| 121 | /* And release qdisc */ |
| 122 | spin_unlock(root_lock); |
Herbert Xu | d90df3a | 2007-05-10 04:55:14 -0700 | [diff] [blame] | 123 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 124 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 125 | if (!netif_tx_queue_stopped(txq) && !netif_tx_queue_frozen(txq)) |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 126 | ret = dev_hard_start_xmit(skb, dev, txq); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 127 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 128 | HARD_TX_UNLOCK(dev, txq); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 129 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 130 | spin_lock(root_lock); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 131 | |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 132 | if (dev_xmit_complete(ret)) { |
| 133 | /* Driver sent out skb successfully or skb was consumed */ |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 134 | ret = qdisc_qlen(q); |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 135 | } else if (ret == NETDEV_TX_LOCKED) { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 136 | /* Driver try lock failed */ |
David S. Miller | eb6aafe | 2008-07-08 23:12:38 -0700 | [diff] [blame] | 137 | ret = handle_dev_cpu_collision(skb, txq, q); |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 138 | } else { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 139 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
| 140 | if (unlikely (ret != NETDEV_TX_BUSY && net_ratelimit())) |
| 141 | printk(KERN_WARNING "BUG %s code %d qlen %d\n", |
| 142 | dev->name, ret, q->q.qlen); |
| 143 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 144 | ret = dev_requeue_skb(skb, q); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 145 | } |
| 146 | |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 147 | if (ret && (netif_tx_queue_stopped(txq) || |
| 148 | netif_tx_queue_frozen(txq))) |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 149 | ret = 0; |
| 150 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 151 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 154 | /* |
| 155 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. |
| 156 | * |
| 157 | * __QDISC_STATE_RUNNING guarantees only one CPU can process |
| 158 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
| 159 | * this queue. |
| 160 | * |
| 161 | * netif_tx_lock serializes accesses to device driver. |
| 162 | * |
| 163 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, |
| 164 | * if one is grabbed, another must be free. |
| 165 | * |
| 166 | * Note, that this procedure can be called by a watchdog timer |
| 167 | * |
| 168 | * Returns to the caller: |
| 169 | * 0 - queue is empty or throttled. |
| 170 | * >0 - queue is not empty. |
| 171 | * |
| 172 | */ |
| 173 | static inline int qdisc_restart(struct Qdisc *q) |
| 174 | { |
| 175 | struct netdev_queue *txq; |
| 176 | struct net_device *dev; |
| 177 | spinlock_t *root_lock; |
| 178 | struct sk_buff *skb; |
| 179 | |
| 180 | /* Dequeue packet */ |
| 181 | skb = dequeue_skb(q); |
| 182 | if (unlikely(!skb)) |
| 183 | return 0; |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 184 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 185 | root_lock = qdisc_lock(q); |
| 186 | dev = qdisc_dev(q); |
| 187 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
| 188 | |
| 189 | return sch_direct_xmit(skb, q, dev, txq, root_lock); |
| 190 | } |
| 191 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 192 | void __qdisc_run(struct Qdisc *q) |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 193 | { |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 194 | unsigned long start_time = jiffies; |
| 195 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 196 | while (qdisc_restart(q)) { |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 197 | /* |
| 198 | * Postpone processing if |
| 199 | * 1. another process needs the CPU; |
| 200 | * 2. we've been doing it for too long. |
| 201 | */ |
| 202 | if (need_resched() || jiffies != start_time) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 203 | __netif_schedule(q); |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 204 | break; |
| 205 | } |
| 206 | } |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 207 | |
David S. Miller | e2627c8 | 2008-07-16 00:56:32 -0700 | [diff] [blame] | 208 | clear_bit(__QDISC_STATE_RUNNING, &q->state); |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 211 | unsigned long dev_trans_start(struct net_device *dev) |
| 212 | { |
| 213 | unsigned long val, res = dev->trans_start; |
| 214 | unsigned int i; |
| 215 | |
| 216 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 217 | val = netdev_get_tx_queue(dev, i)->trans_start; |
| 218 | if (val && time_after(val, res)) |
| 219 | res = val; |
| 220 | } |
| 221 | dev->trans_start = res; |
| 222 | return res; |
| 223 | } |
| 224 | EXPORT_SYMBOL(dev_trans_start); |
| 225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | static void dev_watchdog(unsigned long arg) |
| 227 | { |
| 228 | struct net_device *dev = (struct net_device *)arg; |
| 229 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 230 | netif_tx_lock(dev); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 231 | if (!qdisc_tx_is_noop(dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | if (netif_device_present(dev) && |
| 233 | netif_running(dev) && |
| 234 | netif_carrier_ok(dev)) { |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 235 | int some_queue_timedout = 0; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 236 | unsigned int i; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 237 | unsigned long trans_start; |
Stephen Hemminger | 338f756 | 2006-05-16 15:02:12 -0700 | [diff] [blame] | 238 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 239 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 240 | struct netdev_queue *txq; |
| 241 | |
| 242 | txq = netdev_get_tx_queue(dev, i); |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 243 | /* |
| 244 | * old device drivers set dev->trans_start |
| 245 | */ |
| 246 | trans_start = txq->trans_start ? : dev->trans_start; |
| 247 | if (netif_tx_queue_stopped(txq) && |
| 248 | time_after(jiffies, (trans_start + |
| 249 | dev->watchdog_timeo))) { |
| 250 | some_queue_timedout = 1; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 251 | break; |
| 252 | } |
| 253 | } |
| 254 | |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 255 | if (some_queue_timedout) { |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 256 | char drivername[64]; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 257 | WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n", |
| 258 | dev->name, netdev_drivername(dev, drivername, 64), i); |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 259 | dev->netdev_ops->ndo_tx_timeout(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 261 | if (!mod_timer(&dev->watchdog_timer, |
| 262 | round_jiffies(jiffies + |
| 263 | dev->watchdog_timeo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | dev_hold(dev); |
| 265 | } |
| 266 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 267 | netif_tx_unlock(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | dev_put(dev); |
| 270 | } |
| 271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | void __netdev_watchdog_up(struct net_device *dev) |
| 273 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 274 | if (dev->netdev_ops->ndo_tx_timeout) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | if (dev->watchdog_timeo <= 0) |
| 276 | dev->watchdog_timeo = 5*HZ; |
Venkatesh Pallipadi | 60468d5 | 2007-05-31 21:28:44 -0700 | [diff] [blame] | 277 | if (!mod_timer(&dev->watchdog_timer, |
| 278 | round_jiffies(jiffies + dev->watchdog_timeo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | dev_hold(dev); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | static void dev_watchdog_up(struct net_device *dev) |
| 284 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | __netdev_watchdog_up(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | } |
| 287 | |
| 288 | static void dev_watchdog_down(struct net_device *dev) |
| 289 | { |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 290 | netif_tx_lock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | if (del_timer(&dev->watchdog_timer)) |
Stephen Hemminger | 1533306 | 2006-03-20 22:32:28 -0800 | [diff] [blame] | 292 | dev_put(dev); |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 293 | netif_tx_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 296 | /** |
| 297 | * netif_carrier_on - set carrier |
| 298 | * @dev: network device |
| 299 | * |
| 300 | * Device has detected that carrier. |
| 301 | */ |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 302 | void netif_carrier_on(struct net_device *dev) |
| 303 | { |
Jeff Garzik | bfaae0f | 2007-10-17 23:26:43 -0700 | [diff] [blame] | 304 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 305 | if (dev->reg_state == NETREG_UNINITIALIZED) |
| 306 | return; |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 307 | linkwatch_fire_event(dev); |
Jeff Garzik | bfaae0f | 2007-10-17 23:26:43 -0700 | [diff] [blame] | 308 | if (netif_running(dev)) |
| 309 | __netdev_watchdog_up(dev); |
| 310 | } |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 311 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 312 | EXPORT_SYMBOL(netif_carrier_on); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 313 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 314 | /** |
| 315 | * netif_carrier_off - clear carrier |
| 316 | * @dev: network device |
| 317 | * |
| 318 | * Device has detected loss of carrier. |
| 319 | */ |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 320 | void netif_carrier_off(struct net_device *dev) |
| 321 | { |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 322 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
| 323 | if (dev->reg_state == NETREG_UNINITIALIZED) |
| 324 | return; |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 325 | linkwatch_fire_event(dev); |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 326 | } |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 327 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 328 | EXPORT_SYMBOL(netif_carrier_off); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 329 | |
Ian Campbell | 06c4648 | 2010-05-26 00:09:42 +0000 | [diff] [blame^] | 330 | /** |
| 331 | * netif_notify_peers - notify network peers about existence of @dev |
| 332 | * @dev: network device |
| 333 | * |
| 334 | * Generate traffic such that interested network peers are aware of |
| 335 | * @dev, such as by generating a gratuitous ARP. This may be used when |
| 336 | * a device wants to inform the rest of the network about some sort of |
| 337 | * reconfiguration such as a failover event or virtual machine |
| 338 | * migration. |
| 339 | */ |
| 340 | void netif_notify_peers(struct net_device *dev) |
| 341 | { |
| 342 | rtnl_lock(); |
| 343 | call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); |
| 344 | rtnl_unlock(); |
| 345 | } |
| 346 | EXPORT_SYMBOL(netif_notify_peers); |
| 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
| 349 | under all circumstances. It is difficult to invent anything faster or |
| 350 | cheaper. |
| 351 | */ |
| 352 | |
Thomas Graf | 94df109 | 2005-06-18 22:59:08 -0700 | [diff] [blame] | 353 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc * qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
| 355 | kfree_skb(skb); |
| 356 | return NET_XMIT_CN; |
| 357 | } |
| 358 | |
Thomas Graf | 94df109 | 2005-06-18 22:59:08 -0700 | [diff] [blame] | 359 | static struct sk_buff *noop_dequeue(struct Qdisc * qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
| 361 | return NULL; |
| 362 | } |
| 363 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 364 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | .id = "noop", |
| 366 | .priv_size = 0, |
| 367 | .enqueue = noop_enqueue, |
| 368 | .dequeue = noop_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 369 | .peek = noop_dequeue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | .owner = THIS_MODULE, |
| 371 | }; |
| 372 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 373 | static struct netdev_queue noop_netdev_queue = { |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 374 | .qdisc = &noop_qdisc, |
Jarek Poplawski | 9f3ffae | 2008-10-19 23:37:47 -0700 | [diff] [blame] | 375 | .qdisc_sleeping = &noop_qdisc, |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 376 | }; |
| 377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | struct Qdisc noop_qdisc = { |
| 379 | .enqueue = noop_enqueue, |
| 380 | .dequeue = noop_dequeue, |
| 381 | .flags = TCQ_F_BUILTIN, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 382 | .ops = &noop_qdisc_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | .list = LIST_HEAD_INIT(noop_qdisc.list), |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 384 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 385 | .dev_queue = &noop_netdev_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | }; |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 387 | EXPORT_SYMBOL(noop_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 389 | static struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | .id = "noqueue", |
| 391 | .priv_size = 0, |
| 392 | .enqueue = noop_enqueue, |
| 393 | .dequeue = noop_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 394 | .peek = noop_dequeue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | .owner = THIS_MODULE, |
| 396 | }; |
| 397 | |
David S. Miller | 30ee42b | 2008-07-18 23:00:11 -0700 | [diff] [blame] | 398 | static struct Qdisc noqueue_qdisc; |
| 399 | static struct netdev_queue noqueue_netdev_queue = { |
| 400 | .qdisc = &noqueue_qdisc, |
Jarek Poplawski | 9f3ffae | 2008-10-19 23:37:47 -0700 | [diff] [blame] | 401 | .qdisc_sleeping = &noqueue_qdisc, |
David S. Miller | 30ee42b | 2008-07-18 23:00:11 -0700 | [diff] [blame] | 402 | }; |
| 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | static struct Qdisc noqueue_qdisc = { |
| 405 | .enqueue = NULL, |
| 406 | .dequeue = noop_dequeue, |
| 407 | .flags = TCQ_F_BUILTIN, |
| 408 | .ops = &noqueue_qdisc_ops, |
| 409 | .list = LIST_HEAD_INIT(noqueue_qdisc.list), |
David S. Miller | 30ee42b | 2008-07-18 23:00:11 -0700 | [diff] [blame] | 410 | .q.lock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.q.lock), |
| 411 | .dev_queue = &noqueue_netdev_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | }; |
| 413 | |
| 414 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 415 | static const u8 prio2band[TC_PRIO_MAX+1] = |
| 416 | { 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 }; |
Thomas Graf | 321090e | 2005-06-18 22:58:35 -0700 | [diff] [blame] | 417 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 418 | /* 3-band FIFO queue: old style, but should be a bit faster than |
| 419 | generic prio+fifo combination. |
| 420 | */ |
| 421 | |
| 422 | #define PFIFO_FAST_BANDS 3 |
| 423 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 424 | /* |
| 425 | * Private data for a pfifo_fast scheduler containing: |
| 426 | * - queues for the three band |
| 427 | * - bitmap indicating which of the bands contain skbs |
| 428 | */ |
| 429 | struct pfifo_fast_priv { |
| 430 | u32 bitmap; |
| 431 | struct sk_buff_head q[PFIFO_FAST_BANDS]; |
| 432 | }; |
| 433 | |
| 434 | /* |
| 435 | * Convert a bitmap to the first band number where an skb is queued, where: |
| 436 | * bitmap=0 means there are no skbs on any band. |
| 437 | * bitmap=1 means there is an skb on band 0. |
| 438 | * bitmap=7 means there are skbs on all 3 bands, etc. |
| 439 | */ |
| 440 | static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0}; |
| 441 | |
| 442 | static inline struct sk_buff_head *band2list(struct pfifo_fast_priv *priv, |
| 443 | int band) |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 444 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 445 | return priv->q + band; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc) |
| 449 | { |
Krishna Kumar | a453e06 | 2009-08-30 22:20:28 -0700 | [diff] [blame] | 450 | if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) { |
| 451 | int band = prio2band[skb->priority & TC_PRIO_MAX]; |
| 452 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
| 453 | struct sk_buff_head *list = band2list(priv, band); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 454 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 455 | priv->bitmap |= (1 << band); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 456 | qdisc->q.qlen++; |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 457 | return __qdisc_enqueue_tail(skb, qdisc, list); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 458 | } |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 459 | |
| 460 | return qdisc_drop(skb, qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | } |
| 462 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 463 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 465 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
| 466 | int band = bitmap2band[priv->bitmap]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 468 | if (likely(band >= 0)) { |
| 469 | struct sk_buff_head *list = band2list(priv, band); |
| 470 | struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list); |
| 471 | |
| 472 | qdisc->q.qlen--; |
| 473 | if (skb_queue_empty(list)) |
| 474 | priv->bitmap &= ~(1 << band); |
| 475 | |
| 476 | return skb; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 477 | } |
Thomas Graf | f87a9c3 | 2005-06-18 22:58:53 -0700 | [diff] [blame] | 478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | return NULL; |
| 480 | } |
| 481 | |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 482 | static struct sk_buff *pfifo_fast_peek(struct Qdisc* qdisc) |
| 483 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 484 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
| 485 | int band = bitmap2band[priv->bitmap]; |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 486 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 487 | if (band >= 0) { |
| 488 | struct sk_buff_head *list = band2list(priv, band); |
| 489 | |
| 490 | return skb_peek(list); |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 491 | } |
| 492 | |
| 493 | return NULL; |
| 494 | } |
| 495 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 496 | static void pfifo_fast_reset(struct Qdisc* qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 498 | int prio; |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 499 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 500 | |
| 501 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 502 | __qdisc_reset_queue(qdisc, band2list(priv, prio)); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 503 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 504 | priv->bitmap = 0; |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 505 | qdisc->qstats.backlog = 0; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 506 | qdisc->q.qlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 509 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
| 510 | { |
| 511 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; |
| 512 | |
| 513 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1); |
| 514 | NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); |
| 515 | return skb->len; |
| 516 | |
| 517 | nla_put_failure: |
| 518 | return -1; |
| 519 | } |
| 520 | |
| 521 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt) |
| 522 | { |
| 523 | int prio; |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 524 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 525 | |
| 526 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 527 | skb_queue_head_init(band2list(priv, prio)); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 528 | |
| 529 | return 0; |
| 530 | } |
| 531 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 532 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 533 | .id = "pfifo_fast", |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 534 | .priv_size = sizeof(struct pfifo_fast_priv), |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 535 | .enqueue = pfifo_fast_enqueue, |
| 536 | .dequeue = pfifo_fast_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 537 | .peek = pfifo_fast_peek, |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 538 | .init = pfifo_fast_init, |
| 539 | .reset = pfifo_fast_reset, |
| 540 | .dump = pfifo_fast_dump, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | .owner = THIS_MODULE, |
| 542 | }; |
| 543 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 544 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 545 | struct Qdisc_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
| 547 | void *p; |
| 548 | struct Qdisc *sch; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 549 | unsigned int size; |
| 550 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Eric Dumazet | 5d944c6 | 2010-03-31 07:06:04 +0000 | [diff] [blame] | 552 | /* ensure that the Qdisc and the private data are 64-byte aligned */ |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 553 | size = QDISC_ALIGN(sizeof(*sch)); |
| 554 | size += ops->priv_size + (QDISC_ALIGNTO - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 556 | p = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | if (!p) |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 558 | goto errout; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 559 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
| 560 | sch->padded = (char *) sch - (char *) p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | INIT_LIST_HEAD(&sch->list); |
| 563 | skb_queue_head_init(&sch->q); |
| 564 | sch->ops = ops; |
| 565 | sch->enqueue = ops->enqueue; |
| 566 | sch->dequeue = ops->dequeue; |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 567 | sch->dev_queue = dev_queue; |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 568 | dev_hold(qdisc_dev(sch)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | atomic_set(&sch->refcnt, 1); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 570 | |
| 571 | return sch; |
| 572 | errout: |
WANG Cong | 01e123d | 2008-06-27 19:51:35 -0700 | [diff] [blame] | 573 | return ERR_PTR(err); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 574 | } |
| 575 | |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 576 | struct Qdisc * qdisc_create_dflt(struct net_device *dev, |
| 577 | struct netdev_queue *dev_queue, |
| 578 | struct Qdisc_ops *ops, |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 579 | unsigned int parentid) |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 580 | { |
| 581 | struct Qdisc *sch; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 582 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 583 | sch = qdisc_alloc(dev_queue, ops); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 584 | if (IS_ERR(sch)) |
| 585 | goto errout; |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 586 | sch->parent = parentid; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | if (!ops->init || ops->init(sch, NULL) == 0) |
| 589 | return sch; |
| 590 | |
Thomas Graf | 0fbbeb1 | 2005-08-23 10:12:44 -0700 | [diff] [blame] | 591 | qdisc_destroy(sch); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 592 | errout: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | return NULL; |
| 594 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 595 | EXPORT_SYMBOL(qdisc_create_dflt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 597 | /* Under qdisc_lock(qdisc) and BH! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
| 599 | void qdisc_reset(struct Qdisc *qdisc) |
| 600 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 601 | const struct Qdisc_ops *ops = qdisc->ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
| 603 | if (ops->reset) |
| 604 | ops->reset(qdisc); |
Jarek Poplawski | 67305eb | 2008-11-03 02:52:50 -0800 | [diff] [blame] | 605 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 606 | if (qdisc->gso_skb) { |
| 607 | kfree_skb(qdisc->gso_skb); |
| 608 | qdisc->gso_skb = NULL; |
| 609 | qdisc->q.qlen = 0; |
| 610 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 612 | EXPORT_SYMBOL(qdisc_reset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
Eric Dumazet | 5d944c6 | 2010-03-31 07:06:04 +0000 | [diff] [blame] | 614 | static void qdisc_rcu_free(struct rcu_head *head) |
| 615 | { |
| 616 | struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head); |
| 617 | |
| 618 | kfree((char *) qdisc - qdisc->padded); |
| 619 | } |
| 620 | |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 621 | void qdisc_destroy(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 623 | const struct Qdisc_ops *ops = qdisc->ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 625 | if (qdisc->flags & TCQ_F_BUILTIN || |
| 626 | !atomic_dec_and_test(&qdisc->refcnt)) |
| 627 | return; |
| 628 | |
David S. Miller | 3a682fb | 2008-07-20 18:13:01 -0700 | [diff] [blame] | 629 | #ifdef CONFIG_NET_SCHED |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 630 | qdisc_list_del(qdisc); |
| 631 | |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 632 | qdisc_put_stab(qdisc->stab); |
David S. Miller | 3a682fb | 2008-07-20 18:13:01 -0700 | [diff] [blame] | 633 | #endif |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 634 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 635 | if (ops->reset) |
| 636 | ops->reset(qdisc); |
| 637 | if (ops->destroy) |
| 638 | ops->destroy(qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 640 | module_put(ops->owner); |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 641 | dev_put(qdisc_dev(qdisc)); |
David S. Miller | 8a34c5d | 2008-07-17 00:47:45 -0700 | [diff] [blame] | 642 | |
Jarek Poplawski | 554794d | 2008-10-06 09:54:39 -0700 | [diff] [blame] | 643 | kfree_skb(qdisc->gso_skb); |
Eric Dumazet | 5d944c6 | 2010-03-31 07:06:04 +0000 | [diff] [blame] | 644 | /* |
| 645 | * gen_estimator est_timer() might access qdisc->q.lock, |
| 646 | * wait a RCU grace period before freeing qdisc. |
| 647 | */ |
| 648 | call_rcu(&qdisc->rcu_head, qdisc_rcu_free); |
David S. Miller | 8a34c5d | 2008-07-17 00:47:45 -0700 | [diff] [blame] | 649 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 650 | EXPORT_SYMBOL(qdisc_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
Patrick McHardy | 589983c | 2009-09-04 06:41:20 +0000 | [diff] [blame] | 652 | /* Attach toplevel qdisc to device queue. */ |
| 653 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
| 654 | struct Qdisc *qdisc) |
| 655 | { |
| 656 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; |
| 657 | spinlock_t *root_lock; |
| 658 | |
| 659 | root_lock = qdisc_lock(oqdisc); |
| 660 | spin_lock_bh(root_lock); |
| 661 | |
| 662 | /* Prune old scheduler */ |
| 663 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) |
| 664 | qdisc_reset(oqdisc); |
| 665 | |
| 666 | /* ... and graft new one */ |
| 667 | if (qdisc == NULL) |
| 668 | qdisc = &noop_qdisc; |
| 669 | dev_queue->qdisc_sleeping = qdisc; |
| 670 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); |
| 671 | |
| 672 | spin_unlock_bh(root_lock); |
| 673 | |
| 674 | return oqdisc; |
| 675 | } |
| 676 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 677 | static void attach_one_default_qdisc(struct net_device *dev, |
| 678 | struct netdev_queue *dev_queue, |
| 679 | void *_unused) |
| 680 | { |
| 681 | struct Qdisc *qdisc; |
| 682 | |
| 683 | if (dev->tx_queue_len) { |
| 684 | qdisc = qdisc_create_dflt(dev, dev_queue, |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 685 | &pfifo_fast_ops, TC_H_ROOT); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 686 | if (!qdisc) { |
| 687 | printk(KERN_INFO "%s: activation failed\n", dev->name); |
| 688 | return; |
| 689 | } |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 690 | |
| 691 | /* Can by-pass the queue discipline for default qdisc */ |
| 692 | qdisc->flags |= TCQ_F_CAN_BYPASS; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 693 | } else { |
| 694 | qdisc = &noqueue_qdisc; |
| 695 | } |
| 696 | dev_queue->qdisc_sleeping = qdisc; |
| 697 | } |
| 698 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 699 | static void attach_default_qdiscs(struct net_device *dev) |
| 700 | { |
| 701 | struct netdev_queue *txq; |
| 702 | struct Qdisc *qdisc; |
| 703 | |
| 704 | txq = netdev_get_tx_queue(dev, 0); |
| 705 | |
| 706 | if (!netif_is_multiqueue(dev) || dev->tx_queue_len == 0) { |
| 707 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
| 708 | dev->qdisc = txq->qdisc_sleeping; |
| 709 | atomic_inc(&dev->qdisc->refcnt); |
| 710 | } else { |
| 711 | qdisc = qdisc_create_dflt(dev, txq, &mq_qdisc_ops, TC_H_ROOT); |
| 712 | if (qdisc) { |
| 713 | qdisc->ops->attach(qdisc); |
| 714 | dev->qdisc = qdisc; |
| 715 | } |
| 716 | } |
| 717 | } |
| 718 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 719 | static void transition_one_qdisc(struct net_device *dev, |
| 720 | struct netdev_queue *dev_queue, |
| 721 | void *_need_watchdog) |
| 722 | { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 723 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 724 | int *need_watchdog_p = _need_watchdog; |
| 725 | |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 726 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
| 727 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); |
| 728 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 729 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 730 | if (need_watchdog_p && new_qdisc != &noqueue_qdisc) { |
| 731 | dev_queue->trans_start = 0; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 732 | *need_watchdog_p = 1; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 733 | } |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 734 | } |
| 735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | void dev_activate(struct net_device *dev) |
| 737 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 738 | int need_watchdog; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | /* No queueing discipline is attached to device; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 741 | create default one i.e. pfifo_fast for devices, |
| 742 | which need queueing and noqueue_qdisc for |
| 743 | virtual interfaces |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | */ |
| 745 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 746 | if (dev->qdisc == &noop_qdisc) |
| 747 | attach_default_qdiscs(dev); |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 748 | |
Tommy S. Christensen | cacaddf | 2005-05-03 16:18:52 -0700 | [diff] [blame] | 749 | if (!netif_carrier_ok(dev)) |
| 750 | /* Delay activation until next carrier-on event */ |
| 751 | return; |
| 752 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 753 | need_watchdog = 0; |
| 754 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 755 | transition_one_qdisc(dev, &dev->rx_queue, NULL); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 756 | |
| 757 | if (need_watchdog) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | dev->trans_start = jiffies; |
| 759 | dev_watchdog_up(dev); |
| 760 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 761 | } |
| 762 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 763 | static void dev_deactivate_queue(struct net_device *dev, |
| 764 | struct netdev_queue *dev_queue, |
| 765 | void *_qdisc_default) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 766 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 767 | struct Qdisc *qdisc_default = _qdisc_default; |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 768 | struct Qdisc *qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 769 | |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 770 | qdisc = dev_queue->qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 771 | if (qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 772 | spin_lock_bh(qdisc_lock(qdisc)); |
| 773 | |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 774 | if (!(qdisc->flags & TCQ_F_BUILTIN)) |
| 775 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); |
| 776 | |
Jarek Poplawski | f7a54c1 | 2008-08-27 02:22:07 -0700 | [diff] [blame] | 777 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 778 | qdisc_reset(qdisc); |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 779 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 780 | spin_unlock_bh(qdisc_lock(qdisc)); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 781 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | } |
| 783 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 784 | static bool some_qdisc_is_busy(struct net_device *dev) |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 785 | { |
| 786 | unsigned int i; |
| 787 | |
| 788 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 789 | struct netdev_queue *dev_queue; |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 790 | spinlock_t *root_lock; |
David S. Miller | e2627c8 | 2008-07-16 00:56:32 -0700 | [diff] [blame] | 791 | struct Qdisc *q; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 792 | int val; |
| 793 | |
| 794 | dev_queue = netdev_get_tx_queue(dev, i); |
David S. Miller | b9a3b11 | 2008-08-13 15:18:38 -0700 | [diff] [blame] | 795 | q = dev_queue->qdisc_sleeping; |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 796 | root_lock = qdisc_lock(q); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 797 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 798 | spin_lock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 799 | |
David S. Miller | b9a3b11 | 2008-08-13 15:18:38 -0700 | [diff] [blame] | 800 | val = (test_bit(__QDISC_STATE_RUNNING, &q->state) || |
| 801 | test_bit(__QDISC_STATE_SCHED, &q->state)); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 802 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 803 | spin_unlock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 804 | |
| 805 | if (val) |
| 806 | return true; |
| 807 | } |
| 808 | return false; |
| 809 | } |
| 810 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | void dev_deactivate(struct net_device *dev) |
| 812 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 813 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, &noop_qdisc); |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 814 | dev_deactivate_queue(dev, &dev->rx_queue, &noop_qdisc); |
Herbert Xu | 41a23b0 | 2007-05-10 14:12:47 -0700 | [diff] [blame] | 815 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | dev_watchdog_down(dev); |
| 817 | |
Herbert Xu | ce0e32e | 2007-10-18 22:37:58 -0700 | [diff] [blame] | 818 | /* Wait for outstanding qdisc-less dev_queue_xmit calls. */ |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 819 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 821 | /* Wait for outstanding qdisc_run calls. */ |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 822 | while (some_qdisc_is_busy(dev)) |
| 823 | yield(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | } |
| 825 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 826 | static void dev_init_scheduler_queue(struct net_device *dev, |
| 827 | struct netdev_queue *dev_queue, |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 828 | void *_qdisc) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 829 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 830 | struct Qdisc *qdisc = _qdisc; |
| 831 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 832 | dev_queue->qdisc = qdisc; |
| 833 | dev_queue->qdisc_sleeping = qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 834 | } |
| 835 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | void dev_init_scheduler(struct net_device *dev) |
| 837 | { |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 838 | dev->qdisc = &noop_qdisc; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 839 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 840 | dev_init_scheduler_queue(dev, &dev->rx_queue, &noop_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 842 | setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | } |
| 844 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 845 | static void shutdown_scheduler_queue(struct net_device *dev, |
| 846 | struct netdev_queue *dev_queue, |
| 847 | void *_qdisc_default) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | { |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 849 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 850 | struct Qdisc *qdisc_default = _qdisc_default; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 852 | if (qdisc) { |
Jarek Poplawski | f7a54c1 | 2008-08-27 02:22:07 -0700 | [diff] [blame] | 853 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 854 | dev_queue->qdisc_sleeping = qdisc_default; |
| 855 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | qdisc_destroy(qdisc); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 857 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 858 | } |
| 859 | |
| 860 | void dev_shutdown(struct net_device *dev) |
| 861 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 862 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 863 | shutdown_scheduler_queue(dev, &dev->rx_queue, &noop_qdisc); |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 864 | qdisc_destroy(dev->qdisc); |
| 865 | dev->qdisc = &noop_qdisc; |
| 866 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 867 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | } |