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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <net/pkt_sched.h> |
| 28 | |
| 29 | /* Main transmission queue. */ |
| 30 | |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 31 | /* Modifications to data participating in scheduling must be protected with |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 32 | * qdisc_lock(qdisc) spinlock. |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 33 | * |
| 34 | * The idea is the following: |
David S. Miller | c7e4f3b | 2008-07-16 03:22:39 -0700 | [diff] [blame] | 35 | * - enqueue, dequeue are serialized via qdisc root lock |
| 36 | * - ingress filtering is also serialized via qdisc root lock |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 37 | * - 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] | 38 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 40 | static inline int qdisc_qlen(struct Qdisc *q) |
| 41 | { |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 42 | return q->q.qlen; |
| 43 | } |
| 44 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 45 | 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] | 46 | { |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 47 | if (unlikely(skb->next)) |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 48 | q->gso_skb = skb; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 49 | else |
| 50 | q->ops->requeue(skb, q); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 51 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 52 | __netif_schedule(q); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 53 | return 0; |
| 54 | } |
| 55 | |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 56 | static inline struct sk_buff *dequeue_skb(struct Qdisc *q) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 57 | { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 58 | struct sk_buff *skb; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 59 | |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 60 | if ((skb = q->gso_skb)) |
| 61 | q->gso_skb = NULL; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 62 | else |
| 63 | skb = q->dequeue(q); |
| 64 | |
| 65 | return skb; |
| 66 | } |
| 67 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 68 | static inline int handle_dev_cpu_collision(struct sk_buff *skb, |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 69 | struct netdev_queue *dev_queue, |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 70 | struct Qdisc *q) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 71 | { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 72 | int ret; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 73 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 74 | if (unlikely(dev_queue->xmit_lock_owner == smp_processor_id())) { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 75 | /* |
| 76 | * Same CPU holding the lock. It may be a transient |
| 77 | * configuration error, when hard_start_xmit() recurses. We |
| 78 | * detect it by checking xmit owner and drop the packet when |
| 79 | * deadloop is detected. Return OK to try the next skb. |
| 80 | */ |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 81 | kfree_skb(skb); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 82 | if (net_ratelimit()) |
| 83 | printk(KERN_WARNING "Dead loop on netdevice %s, " |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 84 | "fix it urgently!\n", dev_queue->dev->name); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 85 | ret = qdisc_qlen(q); |
| 86 | } else { |
| 87 | /* |
| 88 | * Another cpu is holding lock, requeue & delay xmits for |
| 89 | * some time. |
| 90 | */ |
| 91 | __get_cpu_var(netdev_rx_stat).cpu_collision++; |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 92 | ret = dev_requeue_skb(skb, q); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 95 | return ret; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 96 | } |
| 97 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 98 | /* |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 99 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 100 | * |
David S. Miller | e2627c8 | 2008-07-16 00:56:32 -0700 | [diff] [blame] | 101 | * __QDISC_STATE_RUNNING guarantees only one CPU can process |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 102 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
| 103 | * this queue. |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 104 | * |
| 105 | * netif_tx_lock serializes accesses to device driver. |
| 106 | * |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 107 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 108 | * if one is grabbed, another must be free. |
| 109 | * |
| 110 | * Note, that this procedure can be called by a watchdog timer |
| 111 | * |
| 112 | * Returns to the caller: |
| 113 | * 0 - queue is empty or throttled. |
| 114 | * >0 - queue is not empty. |
| 115 | * |
| 116 | */ |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 117 | static inline int qdisc_restart(struct Qdisc *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 119 | struct netdev_queue *txq; |
Peter P Waskiewicz Jr | 5f1a485 | 2007-11-13 20:40:55 -0800 | [diff] [blame] | 120 | int ret = NETDEV_TX_BUSY; |
David S. Miller | eb6aafe | 2008-07-08 23:12:38 -0700 | [diff] [blame] | 121 | struct net_device *dev; |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 122 | spinlock_t *root_lock; |
David S. Miller | eb6aafe | 2008-07-08 23:12:38 -0700 | [diff] [blame] | 123 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 125 | /* Dequeue packet */ |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 126 | if (unlikely((skb = dequeue_skb(q)) == NULL)) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 127 | return 0; |
Herbert Xu | f6a78bf | 2006-06-22 02:57:17 -0700 | [diff] [blame] | 128 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 129 | root_lock = qdisc_lock(q); |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 130 | |
| 131 | /* And release qdisc */ |
| 132 | spin_unlock(root_lock); |
Herbert Xu | d90df3a | 2007-05-10 04:55:14 -0700 | [diff] [blame] | 133 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 134 | dev = qdisc_dev(q); |
| 135 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
David S. Miller | eb6aafe | 2008-07-08 23:12:38 -0700 | [diff] [blame] | 136 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 137 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 138 | if (!netif_tx_queue_stopped(txq) && |
| 139 | !netif_tx_queue_frozen(txq)) |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 140 | ret = dev_hard_start_xmit(skb, dev, txq); |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 141 | HARD_TX_UNLOCK(dev, txq); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 142 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 143 | spin_lock(root_lock); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 144 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 145 | switch (ret) { |
| 146 | case NETDEV_TX_OK: |
| 147 | /* Driver sent out skb successfully */ |
| 148 | ret = qdisc_qlen(q); |
| 149 | break; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 150 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 151 | case NETDEV_TX_LOCKED: |
| 152 | /* Driver try lock failed */ |
David S. Miller | eb6aafe | 2008-07-08 23:12:38 -0700 | [diff] [blame] | 153 | ret = handle_dev_cpu_collision(skb, txq, q); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 154 | break; |
| 155 | |
| 156 | default: |
| 157 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
| 158 | if (unlikely (ret != NETDEV_TX_BUSY && net_ratelimit())) |
| 159 | printk(KERN_WARNING "BUG %s code %d qlen %d\n", |
| 160 | dev->name, ret, q->q.qlen); |
| 161 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 162 | ret = dev_requeue_skb(skb, q); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 163 | break; |
| 164 | } |
| 165 | |
David S. Miller | c3f26a2 | 2008-07-31 16:58:50 -0700 | [diff] [blame] | 166 | if (ret && (netif_tx_queue_stopped(txq) || |
| 167 | netif_tx_queue_frozen(txq))) |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 168 | ret = 0; |
| 169 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 170 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 173 | void __qdisc_run(struct Qdisc *q) |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 174 | { |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 175 | unsigned long start_time = jiffies; |
| 176 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 177 | while (qdisc_restart(q)) { |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 178 | /* |
| 179 | * Postpone processing if |
| 180 | * 1. another process needs the CPU; |
| 181 | * 2. we've been doing it for too long. |
| 182 | */ |
| 183 | if (need_resched() || jiffies != start_time) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 184 | __netif_schedule(q); |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 185 | break; |
| 186 | } |
| 187 | } |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 188 | |
David S. Miller | e2627c8 | 2008-07-16 00:56:32 -0700 | [diff] [blame] | 189 | clear_bit(__QDISC_STATE_RUNNING, &q->state); |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 190 | } |
| 191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | static void dev_watchdog(unsigned long arg) |
| 193 | { |
| 194 | struct net_device *dev = (struct net_device *)arg; |
| 195 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 196 | netif_tx_lock(dev); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 197 | if (!qdisc_tx_is_noop(dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | if (netif_device_present(dev) && |
| 199 | netif_running(dev) && |
| 200 | netif_carrier_ok(dev)) { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 201 | int some_queue_stopped = 0; |
| 202 | unsigned int i; |
Stephen Hemminger | 338f756 | 2006-05-16 15:02:12 -0700 | [diff] [blame] | 203 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 204 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 205 | struct netdev_queue *txq; |
| 206 | |
| 207 | txq = netdev_get_tx_queue(dev, i); |
| 208 | if (netif_tx_queue_stopped(txq)) { |
| 209 | some_queue_stopped = 1; |
| 210 | break; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | if (some_queue_stopped && |
| 215 | time_after(jiffies, (dev->trans_start + |
| 216 | dev->watchdog_timeo))) { |
Arjan van de Ven | 6579e57 | 2008-07-21 13:31:48 -0700 | [diff] [blame] | 217 | char drivername[64]; |
| 218 | printk(KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit timed out\n", |
| 219 | dev->name, netdev_drivername(dev, drivername, 64)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | dev->tx_timeout(dev); |
Arjan van de Ven | b4192bb | 2008-05-02 16:21:07 -0700 | [diff] [blame] | 221 | WARN_ON_ONCE(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 223 | if (!mod_timer(&dev->watchdog_timer, |
| 224 | round_jiffies(jiffies + |
| 225 | dev->watchdog_timeo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | dev_hold(dev); |
| 227 | } |
| 228 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 229 | netif_tx_unlock(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
| 231 | dev_put(dev); |
| 232 | } |
| 233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | void __netdev_watchdog_up(struct net_device *dev) |
| 235 | { |
| 236 | if (dev->tx_timeout) { |
| 237 | if (dev->watchdog_timeo <= 0) |
| 238 | dev->watchdog_timeo = 5*HZ; |
Venkatesh Pallipadi | 60468d5 | 2007-05-31 21:28:44 -0700 | [diff] [blame] | 239 | if (!mod_timer(&dev->watchdog_timer, |
| 240 | round_jiffies(jiffies + dev->watchdog_timeo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | dev_hold(dev); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | static void dev_watchdog_up(struct net_device *dev) |
| 246 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | __netdev_watchdog_up(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
| 249 | |
| 250 | static void dev_watchdog_down(struct net_device *dev) |
| 251 | { |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 252 | netif_tx_lock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | if (del_timer(&dev->watchdog_timer)) |
Stephen Hemminger | 1533306 | 2006-03-20 22:32:28 -0800 | [diff] [blame] | 254 | dev_put(dev); |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 255 | netif_tx_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 258 | /** |
| 259 | * netif_carrier_on - set carrier |
| 260 | * @dev: network device |
| 261 | * |
| 262 | * Device has detected that carrier. |
| 263 | */ |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 264 | void netif_carrier_on(struct net_device *dev) |
| 265 | { |
Jeff Garzik | bfaae0f | 2007-10-17 23:26:43 -0700 | [diff] [blame] | 266 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 267 | linkwatch_fire_event(dev); |
Jeff Garzik | bfaae0f | 2007-10-17 23:26:43 -0700 | [diff] [blame] | 268 | if (netif_running(dev)) |
| 269 | __netdev_watchdog_up(dev); |
| 270 | } |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 271 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 272 | EXPORT_SYMBOL(netif_carrier_on); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 273 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 274 | /** |
| 275 | * netif_carrier_off - clear carrier |
| 276 | * @dev: network device |
| 277 | * |
| 278 | * Device has detected loss of carrier. |
| 279 | */ |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 280 | void netif_carrier_off(struct net_device *dev) |
| 281 | { |
| 282 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) |
| 283 | linkwatch_fire_event(dev); |
| 284 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 285 | EXPORT_SYMBOL(netif_carrier_off); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
| 288 | under all circumstances. It is difficult to invent anything faster or |
| 289 | cheaper. |
| 290 | */ |
| 291 | |
Thomas Graf | 94df109 | 2005-06-18 22:59:08 -0700 | [diff] [blame] | 292 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc * qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | { |
| 294 | kfree_skb(skb); |
| 295 | return NET_XMIT_CN; |
| 296 | } |
| 297 | |
Thomas Graf | 94df109 | 2005-06-18 22:59:08 -0700 | [diff] [blame] | 298 | static struct sk_buff *noop_dequeue(struct Qdisc * qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | { |
| 300 | return NULL; |
| 301 | } |
| 302 | |
Thomas Graf | 94df109 | 2005-06-18 22:59:08 -0700 | [diff] [blame] | 303 | static int noop_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | { |
| 305 | if (net_ratelimit()) |
Thomas Graf | 94df109 | 2005-06-18 22:59:08 -0700 | [diff] [blame] | 306 | printk(KERN_DEBUG "%s deferred output. It is buggy.\n", |
| 307 | skb->dev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | kfree_skb(skb); |
| 309 | return NET_XMIT_CN; |
| 310 | } |
| 311 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 312 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | .id = "noop", |
| 314 | .priv_size = 0, |
| 315 | .enqueue = noop_enqueue, |
| 316 | .dequeue = noop_dequeue, |
| 317 | .requeue = noop_requeue, |
| 318 | .owner = THIS_MODULE, |
| 319 | }; |
| 320 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 321 | static struct netdev_queue noop_netdev_queue = { |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 322 | .qdisc = &noop_qdisc, |
| 323 | }; |
| 324 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | struct Qdisc noop_qdisc = { |
| 326 | .enqueue = noop_enqueue, |
| 327 | .dequeue = noop_dequeue, |
| 328 | .flags = TCQ_F_BUILTIN, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 329 | .ops = &noop_qdisc_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | .list = LIST_HEAD_INIT(noop_qdisc.list), |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 331 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 332 | .dev_queue = &noop_netdev_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | }; |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 334 | EXPORT_SYMBOL(noop_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 336 | static struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | .id = "noqueue", |
| 338 | .priv_size = 0, |
| 339 | .enqueue = noop_enqueue, |
| 340 | .dequeue = noop_dequeue, |
| 341 | .requeue = noop_requeue, |
| 342 | .owner = THIS_MODULE, |
| 343 | }; |
| 344 | |
David S. Miller | 30ee42b | 2008-07-18 23:00:11 -0700 | [diff] [blame] | 345 | static struct Qdisc noqueue_qdisc; |
| 346 | static struct netdev_queue noqueue_netdev_queue = { |
| 347 | .qdisc = &noqueue_qdisc, |
| 348 | }; |
| 349 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | static struct Qdisc noqueue_qdisc = { |
| 351 | .enqueue = NULL, |
| 352 | .dequeue = noop_dequeue, |
| 353 | .flags = TCQ_F_BUILTIN, |
| 354 | .ops = &noqueue_qdisc_ops, |
| 355 | .list = LIST_HEAD_INIT(noqueue_qdisc.list), |
David S. Miller | 30ee42b | 2008-07-18 23:00:11 -0700 | [diff] [blame] | 356 | .q.lock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.q.lock), |
| 357 | .dev_queue = &noqueue_netdev_queue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | }; |
| 359 | |
| 360 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 361 | static const u8 prio2band[TC_PRIO_MAX+1] = |
| 362 | { 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] | 363 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 364 | /* 3-band FIFO queue: old style, but should be a bit faster than |
| 365 | generic prio+fifo combination. |
| 366 | */ |
| 367 | |
| 368 | #define PFIFO_FAST_BANDS 3 |
| 369 | |
| 370 | static inline struct sk_buff_head *prio2list(struct sk_buff *skb, |
| 371 | struct Qdisc *qdisc) |
| 372 | { |
| 373 | struct sk_buff_head *list = qdisc_priv(qdisc); |
| 374 | return list + prio2band[skb->priority & TC_PRIO_MAX]; |
| 375 | } |
| 376 | |
| 377 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc) |
| 378 | { |
| 379 | struct sk_buff_head *list = prio2list(skb, qdisc); |
| 380 | |
| 381 | if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len) { |
| 382 | qdisc->q.qlen++; |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 383 | return __qdisc_enqueue_tail(skb, qdisc, list); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 384 | } |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 385 | |
| 386 | return qdisc_drop(skb, qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 389 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 391 | int prio; |
| 392 | struct sk_buff_head *list = qdisc_priv(qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 394 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { |
| 395 | if (!skb_queue_empty(list + prio)) { |
| 396 | qdisc->q.qlen--; |
| 397 | return __qdisc_dequeue_head(qdisc, list + prio); |
| 398 | } |
| 399 | } |
Thomas Graf | f87a9c3 | 2005-06-18 22:58:53 -0700 | [diff] [blame] | 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | return NULL; |
| 402 | } |
| 403 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 404 | static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 406 | qdisc->q.qlen++; |
| 407 | return __qdisc_requeue(skb, qdisc, prio2list(skb, qdisc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | } |
| 409 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 410 | static void pfifo_fast_reset(struct Qdisc* qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 412 | int prio; |
| 413 | struct sk_buff_head *list = qdisc_priv(qdisc); |
| 414 | |
| 415 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
| 416 | __qdisc_reset_queue(qdisc, list + prio); |
| 417 | |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 418 | qdisc->qstats.backlog = 0; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 419 | qdisc->q.qlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 422 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
| 423 | { |
| 424 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; |
| 425 | |
| 426 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1); |
| 427 | NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); |
| 428 | return skb->len; |
| 429 | |
| 430 | nla_put_failure: |
| 431 | return -1; |
| 432 | } |
| 433 | |
| 434 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt) |
| 435 | { |
| 436 | int prio; |
| 437 | struct sk_buff_head *list = qdisc_priv(qdisc); |
| 438 | |
| 439 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
| 440 | skb_queue_head_init(list + prio); |
| 441 | |
| 442 | return 0; |
| 443 | } |
| 444 | |
| 445 | static struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
| 446 | .id = "pfifo_fast", |
| 447 | .priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head), |
| 448 | .enqueue = pfifo_fast_enqueue, |
| 449 | .dequeue = pfifo_fast_dequeue, |
| 450 | .requeue = pfifo_fast_requeue, |
| 451 | .init = pfifo_fast_init, |
| 452 | .reset = pfifo_fast_reset, |
| 453 | .dump = pfifo_fast_dump, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | .owner = THIS_MODULE, |
| 455 | }; |
| 456 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 457 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 458 | struct Qdisc_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | { |
| 460 | void *p; |
| 461 | struct Qdisc *sch; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 462 | unsigned int size; |
| 463 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
| 465 | /* ensure that the Qdisc and the private data are 32-byte aligned */ |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 466 | size = QDISC_ALIGN(sizeof(*sch)); |
| 467 | size += ops->priv_size + (QDISC_ALIGNTO - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 469 | p = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | if (!p) |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 471 | goto errout; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 472 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
| 473 | sch->padded = (char *) sch - (char *) p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
| 475 | INIT_LIST_HEAD(&sch->list); |
| 476 | skb_queue_head_init(&sch->q); |
| 477 | sch->ops = ops; |
| 478 | sch->enqueue = ops->enqueue; |
| 479 | sch->dequeue = ops->dequeue; |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 480 | sch->dev_queue = dev_queue; |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 481 | dev_hold(qdisc_dev(sch)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | atomic_set(&sch->refcnt, 1); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 483 | |
| 484 | return sch; |
| 485 | errout: |
WANG Cong | 01e123d | 2008-06-27 19:51:35 -0700 | [diff] [blame] | 486 | return ERR_PTR(err); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 487 | } |
| 488 | |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 489 | struct Qdisc * qdisc_create_dflt(struct net_device *dev, |
| 490 | struct netdev_queue *dev_queue, |
| 491 | struct Qdisc_ops *ops, |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 492 | unsigned int parentid) |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 493 | { |
| 494 | struct Qdisc *sch; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 495 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 496 | sch = qdisc_alloc(dev_queue, ops); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 497 | if (IS_ERR(sch)) |
| 498 | goto errout; |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 499 | sch->parent = parentid; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | if (!ops->init || ops->init(sch, NULL) == 0) |
| 502 | return sch; |
| 503 | |
Thomas Graf | 0fbbeb1 | 2005-08-23 10:12:44 -0700 | [diff] [blame] | 504 | qdisc_destroy(sch); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 505 | errout: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | return NULL; |
| 507 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 508 | EXPORT_SYMBOL(qdisc_create_dflt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 510 | /* Under qdisc_lock(qdisc) and BH! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
| 512 | void qdisc_reset(struct Qdisc *qdisc) |
| 513 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 514 | const struct Qdisc_ops *ops = qdisc->ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
| 516 | if (ops->reset) |
| 517 | ops->reset(qdisc); |
| 518 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 519 | EXPORT_SYMBOL(qdisc_reset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 521 | void qdisc_destroy(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 523 | const struct Qdisc_ops *ops = qdisc->ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 525 | if (qdisc->flags & TCQ_F_BUILTIN || |
| 526 | !atomic_dec_and_test(&qdisc->refcnt)) |
| 527 | return; |
| 528 | |
| 529 | if (qdisc->parent) |
| 530 | list_del(&qdisc->list); |
| 531 | |
David S. Miller | 3a682fb | 2008-07-20 18:13:01 -0700 | [diff] [blame] | 532 | #ifdef CONFIG_NET_SCHED |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 533 | qdisc_put_stab(qdisc->stab); |
David S. Miller | 3a682fb | 2008-07-20 18:13:01 -0700 | [diff] [blame] | 534 | #endif |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 535 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 536 | if (ops->reset) |
| 537 | ops->reset(qdisc); |
| 538 | if (ops->destroy) |
| 539 | ops->destroy(qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 541 | module_put(ops->owner); |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 542 | dev_put(qdisc_dev(qdisc)); |
David S. Miller | 8a34c5d | 2008-07-17 00:47:45 -0700 | [diff] [blame] | 543 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 544 | kfree_skb(qdisc->gso_skb); |
| 545 | |
David S. Miller | 8a34c5d | 2008-07-17 00:47:45 -0700 | [diff] [blame] | 546 | kfree((char *) qdisc - qdisc->padded); |
| 547 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 548 | EXPORT_SYMBOL(qdisc_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 550 | static bool dev_all_qdisc_sleeping_noop(struct net_device *dev) |
| 551 | { |
| 552 | unsigned int i; |
| 553 | |
| 554 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 555 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); |
| 556 | |
| 557 | if (txq->qdisc_sleeping != &noop_qdisc) |
| 558 | return false; |
| 559 | } |
| 560 | return true; |
| 561 | } |
| 562 | |
| 563 | static void attach_one_default_qdisc(struct net_device *dev, |
| 564 | struct netdev_queue *dev_queue, |
| 565 | void *_unused) |
| 566 | { |
| 567 | struct Qdisc *qdisc; |
| 568 | |
| 569 | if (dev->tx_queue_len) { |
| 570 | qdisc = qdisc_create_dflt(dev, dev_queue, |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 571 | &pfifo_fast_ops, TC_H_ROOT); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 572 | if (!qdisc) { |
| 573 | printk(KERN_INFO "%s: activation failed\n", dev->name); |
| 574 | return; |
| 575 | } |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 576 | } else { |
| 577 | qdisc = &noqueue_qdisc; |
| 578 | } |
| 579 | dev_queue->qdisc_sleeping = qdisc; |
| 580 | } |
| 581 | |
| 582 | static void transition_one_qdisc(struct net_device *dev, |
| 583 | struct netdev_queue *dev_queue, |
| 584 | void *_need_watchdog) |
| 585 | { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 586 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 587 | int *need_watchdog_p = _need_watchdog; |
| 588 | |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 589 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
| 590 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); |
| 591 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 592 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 593 | if (need_watchdog_p && new_qdisc != &noqueue_qdisc) |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 594 | *need_watchdog_p = 1; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 595 | } |
| 596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | void dev_activate(struct net_device *dev) |
| 598 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 599 | int need_watchdog; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | /* No queueing discipline is attached to device; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 602 | create default one i.e. pfifo_fast for devices, |
| 603 | which need queueing and noqueue_qdisc for |
| 604 | virtual interfaces |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | */ |
| 606 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 607 | if (dev_all_qdisc_sleeping_noop(dev)) |
| 608 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Tommy S. Christensen | cacaddf | 2005-05-03 16:18:52 -0700 | [diff] [blame] | 610 | if (!netif_carrier_ok(dev)) |
| 611 | /* Delay activation until next carrier-on event */ |
| 612 | return; |
| 613 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 614 | need_watchdog = 0; |
| 615 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 616 | transition_one_qdisc(dev, &dev->rx_queue, NULL); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 617 | |
| 618 | if (need_watchdog) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | dev->trans_start = jiffies; |
| 620 | dev_watchdog_up(dev); |
| 621 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 622 | } |
| 623 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 624 | static void dev_deactivate_queue(struct net_device *dev, |
| 625 | struct netdev_queue *dev_queue, |
| 626 | void *_qdisc_default) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 627 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 628 | struct Qdisc *qdisc_default = _qdisc_default; |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 629 | struct Qdisc *qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 630 | |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 631 | qdisc = dev_queue->qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 632 | if (qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 633 | spin_lock_bh(qdisc_lock(qdisc)); |
| 634 | |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 635 | if (!(qdisc->flags & TCQ_F_BUILTIN)) |
| 636 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); |
| 637 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 638 | dev_queue->qdisc = qdisc_default; |
| 639 | qdisc_reset(qdisc); |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 640 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 641 | spin_unlock_bh(qdisc_lock(qdisc)); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 642 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
| 644 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 645 | static bool some_qdisc_is_busy(struct net_device *dev) |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 646 | { |
| 647 | unsigned int i; |
| 648 | |
| 649 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 650 | struct netdev_queue *dev_queue; |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 651 | spinlock_t *root_lock; |
David S. Miller | e2627c8 | 2008-07-16 00:56:32 -0700 | [diff] [blame] | 652 | struct Qdisc *q; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 653 | int val; |
| 654 | |
| 655 | dev_queue = netdev_get_tx_queue(dev, i); |
David S. Miller | b9a3b11 | 2008-08-13 15:18:38 -0700 | [diff] [blame] | 656 | q = dev_queue->qdisc_sleeping; |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 657 | root_lock = qdisc_lock(q); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 658 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 659 | spin_lock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 660 | |
David S. Miller | b9a3b11 | 2008-08-13 15:18:38 -0700 | [diff] [blame] | 661 | val = (test_bit(__QDISC_STATE_RUNNING, &q->state) || |
| 662 | test_bit(__QDISC_STATE_SCHED, &q->state)); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 663 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 664 | spin_unlock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 665 | |
| 666 | if (val) |
| 667 | return true; |
| 668 | } |
| 669 | return false; |
| 670 | } |
| 671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | void dev_deactivate(struct net_device *dev) |
| 673 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 674 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, &noop_qdisc); |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 675 | dev_deactivate_queue(dev, &dev->rx_queue, &noop_qdisc); |
Herbert Xu | 41a23b0 | 2007-05-10 14:12:47 -0700 | [diff] [blame] | 676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | dev_watchdog_down(dev); |
| 678 | |
Herbert Xu | ce0e32e | 2007-10-18 22:37:58 -0700 | [diff] [blame] | 679 | /* Wait for outstanding qdisc-less dev_queue_xmit calls. */ |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 680 | synchronize_rcu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 682 | /* Wait for outstanding qdisc_run calls. */ |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 683 | while (some_qdisc_is_busy(dev)) |
| 684 | yield(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
| 686 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 687 | static void dev_init_scheduler_queue(struct net_device *dev, |
| 688 | struct netdev_queue *dev_queue, |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 689 | void *_qdisc) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 690 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 691 | struct Qdisc *qdisc = _qdisc; |
| 692 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 693 | dev_queue->qdisc = qdisc; |
| 694 | dev_queue->qdisc_sleeping = qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 695 | } |
| 696 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | void dev_init_scheduler(struct net_device *dev) |
| 698 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 699 | 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] | 700 | dev_init_scheduler_queue(dev, &dev->rx_queue, &noop_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 702 | setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | } |
| 704 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 705 | static void shutdown_scheduler_queue(struct net_device *dev, |
| 706 | struct netdev_queue *dev_queue, |
| 707 | void *_qdisc_default) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | { |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 709 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 710 | struct Qdisc *qdisc_default = _qdisc_default; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 712 | if (qdisc) { |
| 713 | dev_queue->qdisc = qdisc_default; |
| 714 | dev_queue->qdisc_sleeping = qdisc_default; |
| 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | qdisc_destroy(qdisc); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 717 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 718 | } |
| 719 | |
| 720 | void dev_shutdown(struct net_device *dev) |
| 721 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 722 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 723 | shutdown_scheduler_queue(dev, &dev->rx_queue, &noop_qdisc); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 724 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } |