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> |
nikolay@redhat.com | 07ce76a | 2013-08-03 22:07:47 +0200 | [diff] [blame] | 28 | #include <linux/if_vlan.h> |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 29 | #include <net/sch_generic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <net/pkt_sched.h> |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 31 | #include <net/dst.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
stephen hemminger | 34aedd3 | 2013-08-31 10:15:33 -0700 | [diff] [blame] | 33 | /* Qdisc to use by default */ |
| 34 | const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops; |
| 35 | EXPORT_SYMBOL(default_qdisc_ops); |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | /* Main transmission queue. */ |
| 38 | |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 39 | /* Modifications to data participating in scheduling must be protected with |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 40 | * qdisc_lock(qdisc) spinlock. |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 41 | * |
| 42 | * The idea is the following: |
David S. Miller | c7e4f3b | 2008-07-16 03:22:39 -0700 | [diff] [blame] | 43 | * - enqueue, dequeue are serialized via qdisc root lock |
| 44 | * - ingress filtering is also serialized via qdisc root lock |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 45 | * - 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] | 46 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 48 | 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] | 49 | { |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 50 | skb_dst_force(skb); |
Jarek Poplawski | 6252352 | 2008-10-06 10:41:50 -0700 | [diff] [blame] | 51 | q->gso_skb = skb; |
Jarek Poplawski | 53e9150 | 2008-10-08 11:36:22 -0700 | [diff] [blame] | 52 | q->qstats.requeues++; |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 53 | q->q.qlen++; /* it's still part of the queue */ |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 54 | __netif_schedule(q); |
Jarek Poplawski | 6252352 | 2008-10-06 10:41:50 -0700 | [diff] [blame] | 55 | |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 56 | return 0; |
| 57 | } |
| 58 | |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 59 | static inline struct sk_buff *dequeue_skb(struct Qdisc *q) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 60 | { |
Jarek Poplawski | 554794d | 2008-10-06 09:54:39 -0700 | [diff] [blame] | 61 | struct sk_buff *skb = q->gso_skb; |
Eric Dumazet | 1abbe13 | 2012-12-11 15:54:33 +0000 | [diff] [blame] | 62 | const struct netdev_queue *txq = q->dev_queue; |
Jarek Poplawski | 554794d | 2008-10-06 09:54:39 -0700 | [diff] [blame] | 63 | |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 64 | if (unlikely(skb)) { |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 65 | /* check the reason of requeuing without tx lock first */ |
Eric Dumazet | 1abbe13 | 2012-12-11 15:54:33 +0000 | [diff] [blame] | 66 | txq = netdev_get_tx_queue(txq->dev, skb_get_queue_mapping(skb)); |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 67 | if (!netif_xmit_frozen_or_stopped(txq)) { |
Jarek Poplawski | 6252352 | 2008-10-06 10:41:50 -0700 | [diff] [blame] | 68 | q->gso_skb = NULL; |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 69 | q->q.qlen--; |
| 70 | } else |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 71 | skb = NULL; |
| 72 | } else { |
Eric Dumazet | 1abbe13 | 2012-12-11 15:54:33 +0000 | [diff] [blame] | 73 | if (!(q->flags & TCQ_F_ONETXQUEUE) || !netif_xmit_frozen_or_stopped(txq)) |
| 74 | skb = q->dequeue(q); |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 75 | } |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 76 | |
| 77 | return skb; |
| 78 | } |
| 79 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 80 | static inline int handle_dev_cpu_collision(struct sk_buff *skb, |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 81 | struct netdev_queue *dev_queue, |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 82 | struct Qdisc *q) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 83 | { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 84 | int ret; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 85 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 86 | if (unlikely(dev_queue->xmit_lock_owner == smp_processor_id())) { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 87 | /* |
| 88 | * Same CPU holding the lock. It may be a transient |
| 89 | * configuration error, when hard_start_xmit() recurses. We |
| 90 | * detect it by checking xmit owner and drop the packet when |
| 91 | * deadloop is detected. Return OK to try the next skb. |
| 92 | */ |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 93 | kfree_skb(skb); |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 94 | net_warn_ratelimited("Dead loop on netdevice %s, fix it urgently!\n", |
| 95 | dev_queue->dev->name); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 96 | ret = qdisc_qlen(q); |
| 97 | } else { |
| 98 | /* |
| 99 | * Another cpu is holding lock, requeue & delay xmits for |
| 100 | * some time. |
| 101 | */ |
Eric Dumazet | d6d9ca0 | 2010-07-19 10:48:49 +0000 | [diff] [blame] | 102 | __this_cpu_inc(softnet_data.cpu_collision); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 103 | ret = dev_requeue_skb(skb, q); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 106 | return ret; |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 107 | } |
| 108 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 109 | /* |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 110 | * Transmit one skb, and handle the return status as required. Holding the |
| 111 | * __QDISC_STATE_RUNNING bit guarantees that only one CPU can execute this |
| 112 | * function. |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 113 | * |
| 114 | * Returns to the caller: |
| 115 | * 0 - queue is empty or throttled. |
| 116 | * >0 - queue is not empty. |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 117 | */ |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 118 | int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
| 119 | struct net_device *dev, struct netdev_queue *txq, |
| 120 | spinlock_t *root_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Peter P Waskiewicz Jr | 5f1a485 | 2007-11-13 20:40:55 -0800 | [diff] [blame] | 122 | int ret = NETDEV_TX_BUSY; |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 123 | |
| 124 | /* And release qdisc */ |
| 125 | spin_unlock(root_lock); |
Herbert Xu | d90df3a | 2007-05-10 04:55:14 -0700 | [diff] [blame] | 126 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 127 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 128 | if (!netif_xmit_frozen_or_stopped(txq)) |
Jason Wang | f663dd9 | 2014-01-10 16:18:26 +0800 | [diff] [blame] | 129 | ret = dev_hard_start_xmit(skb, dev, txq); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 130 | |
David S. Miller | c773e84 | 2008-07-08 23:13:53 -0700 | [diff] [blame] | 131 | HARD_TX_UNLOCK(dev, txq); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 132 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 133 | spin_lock(root_lock); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 134 | |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 135 | if (dev_xmit_complete(ret)) { |
| 136 | /* Driver sent out skb successfully or skb was consumed */ |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 137 | ret = qdisc_qlen(q); |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 138 | } else if (ret == NETDEV_TX_LOCKED) { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 139 | /* Driver try lock failed */ |
David S. Miller | eb6aafe | 2008-07-08 23:12:38 -0700 | [diff] [blame] | 140 | ret = handle_dev_cpu_collision(skb, txq, q); |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 141 | } else { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 142 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 143 | if (unlikely(ret != NETDEV_TX_BUSY)) |
| 144 | net_warn_ratelimited("BUG %s code %d qlen %d\n", |
| 145 | dev->name, ret, q->q.qlen); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 146 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 147 | ret = dev_requeue_skb(skb, q); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 150 | if (ret && netif_xmit_frozen_or_stopped(txq)) |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 151 | ret = 0; |
| 152 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 153 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 156 | /* |
| 157 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. |
| 158 | * |
| 159 | * __QDISC_STATE_RUNNING guarantees only one CPU can process |
| 160 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
| 161 | * this queue. |
| 162 | * |
| 163 | * netif_tx_lock serializes accesses to device driver. |
| 164 | * |
| 165 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, |
| 166 | * if one is grabbed, another must be free. |
| 167 | * |
| 168 | * Note, that this procedure can be called by a watchdog timer |
| 169 | * |
| 170 | * Returns to the caller: |
| 171 | * 0 - queue is empty or throttled. |
| 172 | * >0 - queue is not empty. |
| 173 | * |
| 174 | */ |
| 175 | static inline int qdisc_restart(struct Qdisc *q) |
| 176 | { |
| 177 | struct netdev_queue *txq; |
| 178 | struct net_device *dev; |
| 179 | spinlock_t *root_lock; |
| 180 | struct sk_buff *skb; |
| 181 | |
| 182 | /* Dequeue packet */ |
| 183 | skb = dequeue_skb(q); |
| 184 | if (unlikely(!skb)) |
| 185 | return 0; |
Eric Dumazet | 7fee226 | 2010-05-11 23:19:48 +0000 | [diff] [blame] | 186 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 187 | root_lock = qdisc_lock(q); |
| 188 | dev = qdisc_dev(q); |
| 189 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
| 190 | |
| 191 | return sch_direct_xmit(skb, q, dev, txq, root_lock); |
| 192 | } |
| 193 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 194 | void __qdisc_run(struct Qdisc *q) |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 195 | { |
jamal | d5b8aa1 | 2011-06-26 08:13:54 +0000 | [diff] [blame] | 196 | int quota = weight_p; |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 197 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 198 | while (qdisc_restart(q)) { |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 199 | /* |
jamal | d5b8aa1 | 2011-06-26 08:13:54 +0000 | [diff] [blame] | 200 | * Ordered by possible occurrence: Postpone processing if |
| 201 | * 1. we've exceeded packet quota |
| 202 | * 2. another process needs the CPU; |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 203 | */ |
Krishna Kumar | f0c50c7 | 2011-07-14 23:16:21 +0000 | [diff] [blame] | 204 | if (--quota <= 0 || need_resched()) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 205 | __netif_schedule(q); |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 206 | break; |
| 207 | } |
| 208 | } |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 209 | |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 210 | qdisc_run_end(q); |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 213 | unsigned long dev_trans_start(struct net_device *dev) |
| 214 | { |
nikolay@redhat.com | 07ce76a | 2013-08-03 22:07:47 +0200 | [diff] [blame] | 215 | unsigned long val, res; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 216 | unsigned int i; |
| 217 | |
nikolay@redhat.com | 07ce76a | 2013-08-03 22:07:47 +0200 | [diff] [blame] | 218 | if (is_vlan_dev(dev)) |
| 219 | dev = vlan_dev_real_dev(dev); |
| 220 | res = dev->trans_start; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 221 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 222 | val = netdev_get_tx_queue(dev, i)->trans_start; |
| 223 | if (val && time_after(val, res)) |
| 224 | res = val; |
| 225 | } |
| 226 | dev->trans_start = res; |
nikolay@redhat.com | 07ce76a | 2013-08-03 22:07:47 +0200 | [diff] [blame] | 227 | |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 228 | return res; |
| 229 | } |
| 230 | EXPORT_SYMBOL(dev_trans_start); |
| 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | static void dev_watchdog(unsigned long arg) |
| 233 | { |
| 234 | struct net_device *dev = (struct net_device *)arg; |
| 235 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 236 | netif_tx_lock(dev); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 237 | if (!qdisc_tx_is_noop(dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | if (netif_device_present(dev) && |
| 239 | netif_running(dev) && |
| 240 | netif_carrier_ok(dev)) { |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 241 | int some_queue_timedout = 0; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 242 | unsigned int i; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 243 | unsigned long trans_start; |
Stephen Hemminger | 338f756 | 2006-05-16 15:02:12 -0700 | [diff] [blame] | 244 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 245 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 246 | struct netdev_queue *txq; |
| 247 | |
| 248 | txq = netdev_get_tx_queue(dev, i); |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 249 | /* |
| 250 | * old device drivers set dev->trans_start |
| 251 | */ |
| 252 | trans_start = txq->trans_start ? : dev->trans_start; |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 253 | if (netif_xmit_stopped(txq) && |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 254 | time_after(jiffies, (trans_start + |
| 255 | dev->watchdog_timeo))) { |
| 256 | some_queue_timedout = 1; |
david decotigny | ccf5ff6 | 2011-11-16 12:15:10 +0000 | [diff] [blame] | 257 | txq->trans_timeout++; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 258 | break; |
| 259 | } |
| 260 | } |
| 261 | |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 262 | if (some_queue_timedout) { |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 263 | WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n", |
David S. Miller | 3019de1 | 2011-06-06 16:41:33 -0700 | [diff] [blame] | 264 | dev->name, netdev_drivername(dev), i); |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 265 | dev->netdev_ops->ndo_tx_timeout(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 267 | if (!mod_timer(&dev->watchdog_timer, |
| 268 | round_jiffies(jiffies + |
| 269 | dev->watchdog_timeo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | dev_hold(dev); |
| 271 | } |
| 272 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 273 | netif_tx_unlock(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
| 275 | dev_put(dev); |
| 276 | } |
| 277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | void __netdev_watchdog_up(struct net_device *dev) |
| 279 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 280 | if (dev->netdev_ops->ndo_tx_timeout) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | if (dev->watchdog_timeo <= 0) |
| 282 | dev->watchdog_timeo = 5*HZ; |
Venkatesh Pallipadi | 60468d5 | 2007-05-31 21:28:44 -0700 | [diff] [blame] | 283 | if (!mod_timer(&dev->watchdog_timer, |
| 284 | round_jiffies(jiffies + dev->watchdog_timeo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | dev_hold(dev); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | static void dev_watchdog_up(struct net_device *dev) |
| 290 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | __netdev_watchdog_up(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | static void dev_watchdog_down(struct net_device *dev) |
| 295 | { |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 296 | netif_tx_lock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (del_timer(&dev->watchdog_timer)) |
Stephen Hemminger | 1533306 | 2006-03-20 22:32:28 -0800 | [diff] [blame] | 298 | dev_put(dev); |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 299 | netif_tx_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
| 301 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 302 | /** |
| 303 | * netif_carrier_on - set carrier |
| 304 | * @dev: network device |
| 305 | * |
| 306 | * Device has detected that carrier. |
| 307 | */ |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 308 | void netif_carrier_on(struct net_device *dev) |
| 309 | { |
Jeff Garzik | bfaae0f | 2007-10-17 23:26:43 -0700 | [diff] [blame] | 310 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 311 | if (dev->reg_state == NETREG_UNINITIALIZED) |
| 312 | return; |
david decotigny | 2d3b479 | 2014-03-29 09:48:35 -0700 | [diff] [blame] | 313 | atomic_inc(&dev->carrier_changes); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 314 | linkwatch_fire_event(dev); |
Jeff Garzik | bfaae0f | 2007-10-17 23:26:43 -0700 | [diff] [blame] | 315 | if (netif_running(dev)) |
| 316 | __netdev_watchdog_up(dev); |
| 317 | } |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 318 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 319 | EXPORT_SYMBOL(netif_carrier_on); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 320 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 321 | /** |
| 322 | * netif_carrier_off - clear carrier |
| 323 | * @dev: network device |
| 324 | * |
| 325 | * Device has detected loss of carrier. |
| 326 | */ |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 327 | void netif_carrier_off(struct net_device *dev) |
| 328 | { |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 329 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
| 330 | if (dev->reg_state == NETREG_UNINITIALIZED) |
| 331 | return; |
david decotigny | 2d3b479 | 2014-03-29 09:48:35 -0700 | [diff] [blame] | 332 | atomic_inc(&dev->carrier_changes); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 333 | linkwatch_fire_event(dev); |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 334 | } |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 335 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 336 | EXPORT_SYMBOL(netif_carrier_off); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 337 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
| 339 | under all circumstances. It is difficult to invent anything faster or |
| 340 | cheaper. |
| 341 | */ |
| 342 | |
Yang Yingliang | 82d567c | 2013-12-10 20:55:31 +0800 | [diff] [blame] | 343 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | { |
| 345 | kfree_skb(skb); |
| 346 | return NET_XMIT_CN; |
| 347 | } |
| 348 | |
Yang Yingliang | 82d567c | 2013-12-10 20:55:31 +0800 | [diff] [blame] | 349 | static struct sk_buff *noop_dequeue(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | { |
| 351 | return NULL; |
| 352 | } |
| 353 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 354 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | .id = "noop", |
| 356 | .priv_size = 0, |
| 357 | .enqueue = noop_enqueue, |
| 358 | .dequeue = noop_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 359 | .peek = noop_dequeue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | .owner = THIS_MODULE, |
| 361 | }; |
| 362 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 363 | static struct netdev_queue noop_netdev_queue = { |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 364 | .qdisc = &noop_qdisc, |
Jarek Poplawski | 9f3ffae | 2008-10-19 23:37:47 -0700 | [diff] [blame] | 365 | .qdisc_sleeping = &noop_qdisc, |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 366 | }; |
| 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | struct Qdisc noop_qdisc = { |
| 369 | .enqueue = noop_enqueue, |
| 370 | .dequeue = noop_dequeue, |
| 371 | .flags = TCQ_F_BUILTIN, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 372 | .ops = &noop_qdisc_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | .list = LIST_HEAD_INIT(noop_qdisc.list), |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 374 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 375 | .dev_queue = &noop_netdev_queue, |
Eric Dumazet | 7b5edbc | 2010-10-15 19:22:34 +0000 | [diff] [blame] | 376 | .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | }; |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 378 | EXPORT_SYMBOL(noop_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 380 | static struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | .id = "noqueue", |
| 382 | .priv_size = 0, |
| 383 | .enqueue = noop_enqueue, |
| 384 | .dequeue = noop_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 385 | .peek = noop_dequeue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | .owner = THIS_MODULE, |
| 387 | }; |
| 388 | |
David S. Miller | 30ee42b | 2008-07-18 23:00:11 -0700 | [diff] [blame] | 389 | static struct Qdisc noqueue_qdisc; |
| 390 | static struct netdev_queue noqueue_netdev_queue = { |
| 391 | .qdisc = &noqueue_qdisc, |
Jarek Poplawski | 9f3ffae | 2008-10-19 23:37:47 -0700 | [diff] [blame] | 392 | .qdisc_sleeping = &noqueue_qdisc, |
David S. Miller | 30ee42b | 2008-07-18 23:00:11 -0700 | [diff] [blame] | 393 | }; |
| 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | static struct Qdisc noqueue_qdisc = { |
| 396 | .enqueue = NULL, |
| 397 | .dequeue = noop_dequeue, |
| 398 | .flags = TCQ_F_BUILTIN, |
| 399 | .ops = &noqueue_qdisc_ops, |
| 400 | .list = LIST_HEAD_INIT(noqueue_qdisc.list), |
David S. Miller | 30ee42b | 2008-07-18 23:00:11 -0700 | [diff] [blame] | 401 | .q.lock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.q.lock), |
| 402 | .dev_queue = &noqueue_netdev_queue, |
Eric Dumazet | 7b5edbc | 2010-10-15 19:22:34 +0000 | [diff] [blame] | 403 | .busylock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.busylock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | }; |
| 405 | |
| 406 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 407 | static const u8 prio2band[TC_PRIO_MAX + 1] = { |
| 408 | 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 |
| 409 | }; |
Thomas Graf | 321090e | 2005-06-18 22:58:35 -0700 | [diff] [blame] | 410 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 411 | /* 3-band FIFO queue: old style, but should be a bit faster than |
| 412 | generic prio+fifo combination. |
| 413 | */ |
| 414 | |
| 415 | #define PFIFO_FAST_BANDS 3 |
| 416 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 417 | /* |
| 418 | * Private data for a pfifo_fast scheduler containing: |
| 419 | * - queues for the three band |
| 420 | * - bitmap indicating which of the bands contain skbs |
| 421 | */ |
| 422 | struct pfifo_fast_priv { |
| 423 | u32 bitmap; |
| 424 | struct sk_buff_head q[PFIFO_FAST_BANDS]; |
| 425 | }; |
| 426 | |
| 427 | /* |
| 428 | * Convert a bitmap to the first band number where an skb is queued, where: |
| 429 | * bitmap=0 means there are no skbs on any band. |
| 430 | * bitmap=1 means there is an skb on band 0. |
| 431 | * bitmap=7 means there are skbs on all 3 bands, etc. |
| 432 | */ |
| 433 | static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0}; |
| 434 | |
| 435 | static inline struct sk_buff_head *band2list(struct pfifo_fast_priv *priv, |
| 436 | int band) |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 437 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 438 | return priv->q + band; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 439 | } |
| 440 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 441 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc) |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 442 | { |
Krishna Kumar | a453e06 | 2009-08-30 22:20:28 -0700 | [diff] [blame] | 443 | if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) { |
| 444 | int band = prio2band[skb->priority & TC_PRIO_MAX]; |
| 445 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
| 446 | struct sk_buff_head *list = band2list(priv, band); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 447 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 448 | priv->bitmap |= (1 << band); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 449 | qdisc->q.qlen++; |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 450 | return __qdisc_enqueue_tail(skb, qdisc, list); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 451 | } |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 452 | |
| 453 | return qdisc_drop(skb, qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | } |
| 455 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 456 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 458 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
| 459 | int band = bitmap2band[priv->bitmap]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 461 | if (likely(band >= 0)) { |
| 462 | struct sk_buff_head *list = band2list(priv, band); |
| 463 | struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list); |
| 464 | |
| 465 | qdisc->q.qlen--; |
| 466 | if (skb_queue_empty(list)) |
| 467 | priv->bitmap &= ~(1 << band); |
| 468 | |
| 469 | return skb; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 470 | } |
Thomas Graf | f87a9c3 | 2005-06-18 22:58:53 -0700 | [diff] [blame] | 471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | return NULL; |
| 473 | } |
| 474 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 475 | static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc) |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 476 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 477 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
| 478 | int band = bitmap2band[priv->bitmap]; |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 479 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 480 | if (band >= 0) { |
| 481 | struct sk_buff_head *list = band2list(priv, band); |
| 482 | |
| 483 | return skb_peek(list); |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | return NULL; |
| 487 | } |
| 488 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 489 | static void pfifo_fast_reset(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 491 | int prio; |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 492 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 493 | |
| 494 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 495 | __qdisc_reset_queue(qdisc, band2list(priv, prio)); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 496 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 497 | priv->bitmap = 0; |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 498 | qdisc->qstats.backlog = 0; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 499 | qdisc->q.qlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | } |
| 501 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 502 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
| 503 | { |
| 504 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; |
| 505 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 506 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1); |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 507 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
| 508 | goto nla_put_failure; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 509 | return skb->len; |
| 510 | |
| 511 | nla_put_failure: |
| 512 | return -1; |
| 513 | } |
| 514 | |
| 515 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt) |
| 516 | { |
| 517 | int prio; |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 518 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 519 | |
| 520 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 521 | skb_queue_head_init(band2list(priv, prio)); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 522 | |
Eric Dumazet | 2362493 | 2011-01-21 16:26:09 -0800 | [diff] [blame] | 523 | /* Can by-pass the queue discipline */ |
| 524 | qdisc->flags |= TCQ_F_CAN_BYPASS; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 525 | return 0; |
| 526 | } |
| 527 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 528 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 529 | .id = "pfifo_fast", |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 530 | .priv_size = sizeof(struct pfifo_fast_priv), |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 531 | .enqueue = pfifo_fast_enqueue, |
| 532 | .dequeue = pfifo_fast_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 533 | .peek = pfifo_fast_peek, |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 534 | .init = pfifo_fast_init, |
| 535 | .reset = pfifo_fast_reset, |
| 536 | .dump = pfifo_fast_dump, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | .owner = THIS_MODULE, |
| 538 | }; |
| 539 | |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 540 | static struct lock_class_key qdisc_tx_busylock; |
| 541 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 542 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
stephen hemminger | d2a7f26 | 2013-08-31 10:15:50 -0700 | [diff] [blame] | 543 | const struct Qdisc_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | { |
| 545 | void *p; |
| 546 | struct Qdisc *sch; |
Eric Dumazet | d276055 | 2011-03-03 11:10:02 -0800 | [diff] [blame] | 547 | unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 548 | int err = -ENOBUFS; |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 549 | struct net_device *dev = dev_queue->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Eric Dumazet | f2cd2d3 | 2010-11-29 08:14:37 +0000 | [diff] [blame] | 551 | p = kzalloc_node(size, GFP_KERNEL, |
| 552 | netdev_queue_numa_node_read(dev_queue)); |
| 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | if (!p) |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 555 | goto errout; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 556 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
Eric Dumazet | d276055 | 2011-03-03 11:10:02 -0800 | [diff] [blame] | 557 | /* if we got non aligned memory, ask more and do alignment ourself */ |
| 558 | if (sch != p) { |
| 559 | kfree(p); |
| 560 | p = kzalloc_node(size + QDISC_ALIGNTO - 1, GFP_KERNEL, |
| 561 | netdev_queue_numa_node_read(dev_queue)); |
| 562 | if (!p) |
| 563 | goto errout; |
| 564 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
| 565 | sch->padded = (char *) sch - (char *) p; |
| 566 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | INIT_LIST_HEAD(&sch->list); |
| 568 | skb_queue_head_init(&sch->q); |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 569 | |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 570 | spin_lock_init(&sch->busylock); |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 571 | lockdep_set_class(&sch->busylock, |
| 572 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); |
| 573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | sch->ops = ops; |
| 575 | sch->enqueue = ops->enqueue; |
| 576 | sch->dequeue = ops->dequeue; |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 577 | sch->dev_queue = dev_queue; |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 578 | dev_hold(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | atomic_set(&sch->refcnt, 1); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 580 | |
| 581 | return sch; |
| 582 | errout: |
WANG Cong | 01e123d | 2008-06-27 19:51:35 -0700 | [diff] [blame] | 583 | return ERR_PTR(err); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 584 | } |
| 585 | |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 586 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
stephen hemminger | d2a7f26 | 2013-08-31 10:15:50 -0700 | [diff] [blame] | 587 | const struct Qdisc_ops *ops, |
| 588 | unsigned int parentid) |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 589 | { |
| 590 | struct Qdisc *sch; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 591 | |
stephen hemminger | 6da7c8f | 2013-08-27 16:19:08 -0700 | [diff] [blame] | 592 | if (!try_module_get(ops->owner)) |
| 593 | goto errout; |
| 594 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 595 | sch = qdisc_alloc(dev_queue, ops); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 596 | if (IS_ERR(sch)) |
| 597 | goto errout; |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 598 | sch->parent = parentid; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | if (!ops->init || ops->init(sch, NULL) == 0) |
| 601 | return sch; |
| 602 | |
Thomas Graf | 0fbbeb1 | 2005-08-23 10:12:44 -0700 | [diff] [blame] | 603 | qdisc_destroy(sch); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 604 | errout: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | return NULL; |
| 606 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 607 | EXPORT_SYMBOL(qdisc_create_dflt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 609 | /* Under qdisc_lock(qdisc) and BH! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
| 611 | void qdisc_reset(struct Qdisc *qdisc) |
| 612 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 613 | const struct Qdisc_ops *ops = qdisc->ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
| 615 | if (ops->reset) |
| 616 | ops->reset(qdisc); |
Jarek Poplawski | 67305eb | 2008-11-03 02:52:50 -0800 | [diff] [blame] | 617 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 618 | if (qdisc->gso_skb) { |
| 619 | kfree_skb(qdisc->gso_skb); |
| 620 | qdisc->gso_skb = NULL; |
| 621 | qdisc->q.qlen = 0; |
| 622 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 624 | EXPORT_SYMBOL(qdisc_reset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Eric Dumazet | 5d944c6 | 2010-03-31 07:06:04 +0000 | [diff] [blame] | 626 | static void qdisc_rcu_free(struct rcu_head *head) |
| 627 | { |
| 628 | struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head); |
| 629 | |
| 630 | kfree((char *) qdisc - qdisc->padded); |
| 631 | } |
| 632 | |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 633 | void qdisc_destroy(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 635 | const struct Qdisc_ops *ops = qdisc->ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 637 | if (qdisc->flags & TCQ_F_BUILTIN || |
| 638 | !atomic_dec_and_test(&qdisc->refcnt)) |
| 639 | return; |
| 640 | |
David S. Miller | 3a682fb | 2008-07-20 18:13:01 -0700 | [diff] [blame] | 641 | #ifdef CONFIG_NET_SCHED |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 642 | qdisc_list_del(qdisc); |
| 643 | |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 644 | qdisc_put_stab(rtnl_dereference(qdisc->stab)); |
David S. Miller | 3a682fb | 2008-07-20 18:13:01 -0700 | [diff] [blame] | 645 | #endif |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 646 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 647 | if (ops->reset) |
| 648 | ops->reset(qdisc); |
| 649 | if (ops->destroy) |
| 650 | ops->destroy(qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 652 | module_put(ops->owner); |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 653 | dev_put(qdisc_dev(qdisc)); |
David S. Miller | 8a34c5d | 2008-07-17 00:47:45 -0700 | [diff] [blame] | 654 | |
Jarek Poplawski | 554794d | 2008-10-06 09:54:39 -0700 | [diff] [blame] | 655 | kfree_skb(qdisc->gso_skb); |
Eric Dumazet | 5d944c6 | 2010-03-31 07:06:04 +0000 | [diff] [blame] | 656 | /* |
| 657 | * gen_estimator est_timer() might access qdisc->q.lock, |
| 658 | * wait a RCU grace period before freeing qdisc. |
| 659 | */ |
| 660 | call_rcu(&qdisc->rcu_head, qdisc_rcu_free); |
David S. Miller | 8a34c5d | 2008-07-17 00:47:45 -0700 | [diff] [blame] | 661 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 662 | EXPORT_SYMBOL(qdisc_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
Patrick McHardy | 589983c | 2009-09-04 06:41:20 +0000 | [diff] [blame] | 664 | /* Attach toplevel qdisc to device queue. */ |
| 665 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
| 666 | struct Qdisc *qdisc) |
| 667 | { |
| 668 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; |
| 669 | spinlock_t *root_lock; |
| 670 | |
| 671 | root_lock = qdisc_lock(oqdisc); |
| 672 | spin_lock_bh(root_lock); |
| 673 | |
| 674 | /* Prune old scheduler */ |
| 675 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) |
| 676 | qdisc_reset(oqdisc); |
| 677 | |
| 678 | /* ... and graft new one */ |
| 679 | if (qdisc == NULL) |
| 680 | qdisc = &noop_qdisc; |
| 681 | dev_queue->qdisc_sleeping = qdisc; |
| 682 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); |
| 683 | |
| 684 | spin_unlock_bh(root_lock); |
| 685 | |
| 686 | return oqdisc; |
| 687 | } |
John Fastabend | b8970f0 | 2011-01-17 08:06:09 +0000 | [diff] [blame] | 688 | EXPORT_SYMBOL(dev_graft_qdisc); |
Patrick McHardy | 589983c | 2009-09-04 06:41:20 +0000 | [diff] [blame] | 689 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 690 | static void attach_one_default_qdisc(struct net_device *dev, |
| 691 | struct netdev_queue *dev_queue, |
| 692 | void *_unused) |
| 693 | { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 694 | struct Qdisc *qdisc = &noqueue_qdisc; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 695 | |
| 696 | if (dev->tx_queue_len) { |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 697 | qdisc = qdisc_create_dflt(dev_queue, |
stephen hemminger | 6da7c8f | 2013-08-27 16:19:08 -0700 | [diff] [blame] | 698 | default_qdisc_ops, TC_H_ROOT); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 699 | if (!qdisc) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 700 | netdev_info(dev, "activation failed\n"); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 701 | return; |
| 702 | } |
Eric Dumazet | 1abbe13 | 2012-12-11 15:54:33 +0000 | [diff] [blame] | 703 | if (!netif_is_multiqueue(dev)) |
| 704 | qdisc->flags |= TCQ_F_ONETXQUEUE; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 705 | } |
| 706 | dev_queue->qdisc_sleeping = qdisc; |
| 707 | } |
| 708 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 709 | static void attach_default_qdiscs(struct net_device *dev) |
| 710 | { |
| 711 | struct netdev_queue *txq; |
| 712 | struct Qdisc *qdisc; |
| 713 | |
| 714 | txq = netdev_get_tx_queue(dev, 0); |
| 715 | |
| 716 | if (!netif_is_multiqueue(dev) || dev->tx_queue_len == 0) { |
| 717 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
| 718 | dev->qdisc = txq->qdisc_sleeping; |
| 719 | atomic_inc(&dev->qdisc->refcnt); |
| 720 | } else { |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 721 | qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT); |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 722 | if (qdisc) { |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 723 | dev->qdisc = qdisc; |
Eric Dumazet | e57a784 | 2013-12-12 15:41:56 -0800 | [diff] [blame] | 724 | qdisc->ops->attach(qdisc); |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 725 | } |
| 726 | } |
| 727 | } |
| 728 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 729 | static void transition_one_qdisc(struct net_device *dev, |
| 730 | struct netdev_queue *dev_queue, |
| 731 | void *_need_watchdog) |
| 732 | { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 733 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 734 | int *need_watchdog_p = _need_watchdog; |
| 735 | |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 736 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
| 737 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); |
| 738 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 739 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 740 | if (need_watchdog_p && new_qdisc != &noqueue_qdisc) { |
| 741 | dev_queue->trans_start = 0; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 742 | *need_watchdog_p = 1; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 743 | } |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 744 | } |
| 745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | void dev_activate(struct net_device *dev) |
| 747 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 748 | int need_watchdog; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 749 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | /* No queueing discipline is attached to device; |
stephen hemminger | 6da7c8f | 2013-08-27 16:19:08 -0700 | [diff] [blame] | 751 | * create default one for devices, which need queueing |
| 752 | * and noqueue_qdisc for virtual interfaces |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | */ |
| 754 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 755 | if (dev->qdisc == &noop_qdisc) |
| 756 | attach_default_qdiscs(dev); |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 757 | |
Tommy S. Christensen | cacaddf | 2005-05-03 16:18:52 -0700 | [diff] [blame] | 758 | if (!netif_carrier_ok(dev)) |
| 759 | /* Delay activation until next carrier-on event */ |
| 760 | return; |
| 761 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 762 | need_watchdog = 0; |
| 763 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 764 | if (dev_ingress_queue(dev)) |
| 765 | transition_one_qdisc(dev, dev_ingress_queue(dev), NULL); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 766 | |
| 767 | if (need_watchdog) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | dev->trans_start = jiffies; |
| 769 | dev_watchdog_up(dev); |
| 770 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 771 | } |
John Fastabend | b8970f0 | 2011-01-17 08:06:09 +0000 | [diff] [blame] | 772 | EXPORT_SYMBOL(dev_activate); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 773 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 774 | static void dev_deactivate_queue(struct net_device *dev, |
| 775 | struct netdev_queue *dev_queue, |
| 776 | void *_qdisc_default) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 777 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 778 | struct Qdisc *qdisc_default = _qdisc_default; |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 779 | struct Qdisc *qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 780 | |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 781 | qdisc = dev_queue->qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 782 | if (qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 783 | spin_lock_bh(qdisc_lock(qdisc)); |
| 784 | |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 785 | if (!(qdisc->flags & TCQ_F_BUILTIN)) |
| 786 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); |
| 787 | |
Jarek Poplawski | f7a54c1 | 2008-08-27 02:22:07 -0700 | [diff] [blame] | 788 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 789 | qdisc_reset(qdisc); |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 790 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 791 | spin_unlock_bh(qdisc_lock(qdisc)); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 792 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
| 794 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 795 | static bool some_qdisc_is_busy(struct net_device *dev) |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 796 | { |
| 797 | unsigned int i; |
| 798 | |
| 799 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 800 | struct netdev_queue *dev_queue; |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 801 | spinlock_t *root_lock; |
David S. Miller | e2627c8 | 2008-07-16 00:56:32 -0700 | [diff] [blame] | 802 | struct Qdisc *q; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 803 | int val; |
| 804 | |
| 805 | dev_queue = netdev_get_tx_queue(dev, i); |
David S. Miller | b9a3b11 | 2008-08-13 15:18:38 -0700 | [diff] [blame] | 806 | q = dev_queue->qdisc_sleeping; |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 807 | root_lock = qdisc_lock(q); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 808 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 809 | spin_lock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 810 | |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 811 | val = (qdisc_is_running(q) || |
David S. Miller | b9a3b11 | 2008-08-13 15:18:38 -0700 | [diff] [blame] | 812 | test_bit(__QDISC_STATE_SCHED, &q->state)); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 813 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 814 | spin_unlock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 815 | |
| 816 | if (val) |
| 817 | return true; |
| 818 | } |
| 819 | return false; |
| 820 | } |
| 821 | |
Eric Dumazet | 3137663 | 2011-05-19 23:42:09 +0000 | [diff] [blame] | 822 | /** |
| 823 | * dev_deactivate_many - deactivate transmissions on several devices |
| 824 | * @head: list of devices to deactivate |
| 825 | * |
| 826 | * This function returns only when all outstanding transmissions |
| 827 | * have completed, unless all devices are in dismantle phase. |
| 828 | */ |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 829 | void dev_deactivate_many(struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 831 | struct net_device *dev; |
Eric Dumazet | 3137663 | 2011-05-19 23:42:09 +0000 | [diff] [blame] | 832 | bool sync_needed = false; |
Herbert Xu | 41a23b0 | 2007-05-10 14:12:47 -0700 | [diff] [blame] | 833 | |
Eric W. Biederman | 5cde282 | 2013-10-05 19:26:05 -0700 | [diff] [blame] | 834 | list_for_each_entry(dev, head, close_list) { |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 835 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, |
| 836 | &noop_qdisc); |
| 837 | if (dev_ingress_queue(dev)) |
| 838 | dev_deactivate_queue(dev, dev_ingress_queue(dev), |
| 839 | &noop_qdisc); |
| 840 | |
| 841 | dev_watchdog_down(dev); |
Eric Dumazet | 3137663 | 2011-05-19 23:42:09 +0000 | [diff] [blame] | 842 | sync_needed |= !dev->dismantle; |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 843 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Eric Dumazet | 3137663 | 2011-05-19 23:42:09 +0000 | [diff] [blame] | 845 | /* Wait for outstanding qdisc-less dev_queue_xmit calls. |
| 846 | * This is avoided if all devices are in dismantle phase : |
| 847 | * Caller will call synchronize_net() for us |
| 848 | */ |
| 849 | if (sync_needed) |
| 850 | synchronize_net(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 852 | /* Wait for outstanding qdisc_run calls. */ |
Eric W. Biederman | 5cde282 | 2013-10-05 19:26:05 -0700 | [diff] [blame] | 853 | list_for_each_entry(dev, head, close_list) |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 854 | while (some_qdisc_is_busy(dev)) |
| 855 | yield(); |
| 856 | } |
| 857 | |
| 858 | void dev_deactivate(struct net_device *dev) |
| 859 | { |
| 860 | LIST_HEAD(single); |
| 861 | |
Eric W. Biederman | 5cde282 | 2013-10-05 19:26:05 -0700 | [diff] [blame] | 862 | list_add(&dev->close_list, &single); |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 863 | dev_deactivate_many(&single); |
Eric W. Biederman | 5f04d50 | 2011-02-20 11:49:45 -0800 | [diff] [blame] | 864 | list_del(&single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | } |
John Fastabend | b8970f0 | 2011-01-17 08:06:09 +0000 | [diff] [blame] | 866 | EXPORT_SYMBOL(dev_deactivate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 868 | static void dev_init_scheduler_queue(struct net_device *dev, |
| 869 | struct netdev_queue *dev_queue, |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 870 | void *_qdisc) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 871 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 872 | struct Qdisc *qdisc = _qdisc; |
| 873 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 874 | dev_queue->qdisc = qdisc; |
| 875 | dev_queue->qdisc_sleeping = qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 876 | } |
| 877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | void dev_init_scheduler(struct net_device *dev) |
| 879 | { |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 880 | dev->qdisc = &noop_qdisc; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 881 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 882 | if (dev_ingress_queue(dev)) |
| 883 | dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 885 | setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | } |
| 887 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 888 | static void shutdown_scheduler_queue(struct net_device *dev, |
| 889 | struct netdev_queue *dev_queue, |
| 890 | void *_qdisc_default) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | { |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 892 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 893 | struct Qdisc *qdisc_default = _qdisc_default; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 895 | if (qdisc) { |
Jarek Poplawski | f7a54c1 | 2008-08-27 02:22:07 -0700 | [diff] [blame] | 896 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 897 | dev_queue->qdisc_sleeping = qdisc_default; |
| 898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | qdisc_destroy(qdisc); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 900 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 901 | } |
| 902 | |
| 903 | void dev_shutdown(struct net_device *dev) |
| 904 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 905 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 906 | if (dev_ingress_queue(dev)) |
| 907 | shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 908 | qdisc_destroy(dev->qdisc); |
| 909 | dev->qdisc = &noop_qdisc; |
| 910 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 911 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | } |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 913 | |
Eric Dumazet | 01cb71d | 2013-06-02 13:55:05 +0000 | [diff] [blame] | 914 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
Eric Dumazet | 3e1e3aa | 2013-09-19 09:10:03 -0700 | [diff] [blame] | 915 | const struct tc_ratespec *conf, |
| 916 | u64 rate64) |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 917 | { |
Eric Dumazet | 01cb71d | 2013-06-02 13:55:05 +0000 | [diff] [blame] | 918 | memset(r, 0, sizeof(*r)); |
| 919 | r->overhead = conf->overhead; |
Eric Dumazet | 3e1e3aa | 2013-09-19 09:10:03 -0700 | [diff] [blame] | 920 | r->rate_bytes_ps = max_t(u64, conf->rate, rate64); |
Jesper Dangaard Brouer | 8a8e3d8 | 2013-08-14 23:47:11 +0200 | [diff] [blame] | 921 | r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK); |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 922 | r->mult = 1; |
| 923 | /* |
Eric Dumazet | 130d3d6 | 2013-06-06 13:56:19 -0700 | [diff] [blame] | 924 | * The deal here is to replace a divide by a reciprocal one |
| 925 | * in fast path (a reciprocal divide is a multiply and a shift) |
| 926 | * |
| 927 | * Normal formula would be : |
| 928 | * time_in_ns = (NSEC_PER_SEC * len) / rate_bps |
| 929 | * |
| 930 | * We compute mult/shift to use instead : |
| 931 | * time_in_ns = (len * mult) >> shift; |
| 932 | * |
| 933 | * We try to get the highest possible mult value for accuracy, |
| 934 | * but have to make sure no overflows will ever happen. |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 935 | */ |
Eric Dumazet | 130d3d6 | 2013-06-06 13:56:19 -0700 | [diff] [blame] | 936 | if (r->rate_bytes_ps > 0) { |
| 937 | u64 factor = NSEC_PER_SEC; |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 938 | |
Eric Dumazet | 130d3d6 | 2013-06-06 13:56:19 -0700 | [diff] [blame] | 939 | for (;;) { |
| 940 | r->mult = div64_u64(factor, r->rate_bytes_ps); |
| 941 | if (r->mult & (1U << 31) || factor & (1ULL << 63)) |
| 942 | break; |
| 943 | factor <<= 1; |
| 944 | r->shift++; |
| 945 | } |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 946 | } |
| 947 | } |
| 948 | EXPORT_SYMBOL(psched_ratecfg_precompute); |