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> |
Jesper Dangaard Brouer | e543002 | 2017-08-15 21:11:03 +0200 | [diff] [blame] | 32 | #include <trace/events/qdisc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
stephen hemminger | 34aedd3 | 2013-08-31 10:15:33 -0700 | [diff] [blame] | 34 | /* Qdisc to use by default */ |
| 35 | const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops; |
| 36 | EXPORT_SYMBOL(default_qdisc_ops); |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | /* Main transmission queue. */ |
| 39 | |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 40 | /* Modifications to data participating in scheduling must be protected with |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 41 | * qdisc_lock(qdisc) spinlock. |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 42 | * |
| 43 | * The idea is the following: |
David S. Miller | c7e4f3b | 2008-07-16 03:22:39 -0700 | [diff] [blame] | 44 | * - enqueue, dequeue are serialized via qdisc root lock |
| 45 | * - ingress filtering is also serialized via qdisc root lock |
Patrick McHardy | 0463d4a | 2007-04-16 17:02:10 -0700 | [diff] [blame] | 46 | * - 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] | 47 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 49 | 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] | 50 | { |
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++; |
WANG Cong | a27758f | 2016-06-03 15:05:57 -0700 | [diff] [blame] | 53 | qdisc_qstats_backlog_inc(q, skb); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 54 | q->q.qlen++; /* it's still part of the queue */ |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 55 | __netif_schedule(q); |
Jarek Poplawski | 6252352 | 2008-10-06 10:41:50 -0700 | [diff] [blame] | 56 | |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 57 | return 0; |
| 58 | } |
| 59 | |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 60 | static void try_bulk_dequeue_skb(struct Qdisc *q, |
| 61 | struct sk_buff *skb, |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 62 | const struct netdev_queue *txq, |
| 63 | int *packets) |
Jesper Dangaard Brouer | 5772e9a | 2014-10-01 22:35:59 +0200 | [diff] [blame] | 64 | { |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 65 | int bytelimit = qdisc_avail_bulklimit(txq) - skb->len; |
Jesper Dangaard Brouer | 5772e9a | 2014-10-01 22:35:59 +0200 | [diff] [blame] | 66 | |
| 67 | while (bytelimit > 0) { |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 68 | struct sk_buff *nskb = q->dequeue(q); |
| 69 | |
| 70 | if (!nskb) |
Jesper Dangaard Brouer | 5772e9a | 2014-10-01 22:35:59 +0200 | [diff] [blame] | 71 | break; |
| 72 | |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 73 | bytelimit -= nskb->len; /* covers GSO len */ |
| 74 | skb->next = nskb; |
| 75 | skb = nskb; |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 76 | (*packets)++; /* GSO counts as one pkt */ |
Jesper Dangaard Brouer | 5772e9a | 2014-10-01 22:35:59 +0200 | [diff] [blame] | 77 | } |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 78 | skb->next = NULL; |
Jesper Dangaard Brouer | 5772e9a | 2014-10-01 22:35:59 +0200 | [diff] [blame] | 79 | } |
| 80 | |
Eric Dumazet | 4d202a0 | 2016-06-21 23:16:52 -0700 | [diff] [blame] | 81 | /* This variant of try_bulk_dequeue_skb() makes sure |
| 82 | * all skbs in the chain are for the same txq |
| 83 | */ |
| 84 | static void try_bulk_dequeue_skb_slow(struct Qdisc *q, |
| 85 | struct sk_buff *skb, |
| 86 | int *packets) |
| 87 | { |
| 88 | int mapping = skb_get_queue_mapping(skb); |
| 89 | struct sk_buff *nskb; |
| 90 | int cnt = 0; |
| 91 | |
| 92 | do { |
| 93 | nskb = q->dequeue(q); |
| 94 | if (!nskb) |
| 95 | break; |
| 96 | if (unlikely(skb_get_queue_mapping(nskb) != mapping)) { |
| 97 | q->skb_bad_txq = nskb; |
| 98 | qdisc_qstats_backlog_inc(q, nskb); |
| 99 | q->q.qlen++; |
| 100 | break; |
| 101 | } |
| 102 | skb->next = nskb; |
| 103 | skb = nskb; |
| 104 | } while (++cnt < 8); |
| 105 | (*packets) += cnt; |
| 106 | skb->next = NULL; |
| 107 | } |
| 108 | |
Jesper Dangaard Brouer | 5772e9a | 2014-10-01 22:35:59 +0200 | [diff] [blame] | 109 | /* Note that dequeue_skb can possibly return a SKB list (via skb->next). |
| 110 | * A requeued skb (via q->gso_skb) can also be a SKB list. |
| 111 | */ |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 112 | static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate, |
| 113 | int *packets) |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 114 | { |
Jarek Poplawski | 554794d | 2008-10-06 09:54:39 -0700 | [diff] [blame] | 115 | struct sk_buff *skb = q->gso_skb; |
Eric Dumazet | 1abbe13 | 2012-12-11 15:54:33 +0000 | [diff] [blame] | 116 | const struct netdev_queue *txq = q->dev_queue; |
Jarek Poplawski | 554794d | 2008-10-06 09:54:39 -0700 | [diff] [blame] | 117 | |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 118 | *packets = 1; |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 119 | if (unlikely(skb)) { |
Eric Dumazet | 4d202a0 | 2016-06-21 23:16:52 -0700 | [diff] [blame] | 120 | /* skb in gso_skb were already validated */ |
| 121 | *validate = false; |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 122 | /* check the reason of requeuing without tx lock first */ |
Daniel Borkmann | 10c51b5623 | 2014-08-27 11:11:27 +0200 | [diff] [blame] | 123 | txq = skb_get_tx_queue(txq->dev, skb); |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 124 | if (!netif_xmit_frozen_or_stopped(txq)) { |
Jarek Poplawski | 6252352 | 2008-10-06 10:41:50 -0700 | [diff] [blame] | 125 | q->gso_skb = NULL; |
WANG Cong | a27758f | 2016-06-03 15:05:57 -0700 | [diff] [blame] | 126 | qdisc_qstats_backlog_dec(q, skb); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 127 | q->q.qlen--; |
| 128 | } else |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 129 | skb = NULL; |
Jesper Dangaard Brouer | e543002 | 2017-08-15 21:11:03 +0200 | [diff] [blame] | 130 | goto trace; |
Eric Dumazet | 4d202a0 | 2016-06-21 23:16:52 -0700 | [diff] [blame] | 131 | } |
| 132 | *validate = true; |
| 133 | skb = q->skb_bad_txq; |
| 134 | if (unlikely(skb)) { |
| 135 | /* check the reason of requeuing without tx lock first */ |
| 136 | txq = skb_get_tx_queue(txq->dev, skb); |
| 137 | if (!netif_xmit_frozen_or_stopped(txq)) { |
| 138 | q->skb_bad_txq = NULL; |
| 139 | qdisc_qstats_backlog_dec(q, skb); |
| 140 | q->q.qlen--; |
| 141 | goto bulk; |
David S. Miller | 50cbe9a | 2014-08-30 19:13:51 -0700 | [diff] [blame] | 142 | } |
Jesper Dangaard Brouer | e543002 | 2017-08-15 21:11:03 +0200 | [diff] [blame] | 143 | skb = NULL; |
| 144 | goto trace; |
Eric Dumazet | 4d202a0 | 2016-06-21 23:16:52 -0700 | [diff] [blame] | 145 | } |
| 146 | if (!(q->flags & TCQ_F_ONETXQUEUE) || |
| 147 | !netif_xmit_frozen_or_stopped(txq)) |
| 148 | skb = q->dequeue(q); |
| 149 | if (skb) { |
| 150 | bulk: |
| 151 | if (qdisc_may_bulk(q)) |
| 152 | try_bulk_dequeue_skb(q, skb, txq, packets); |
| 153 | else |
| 154 | try_bulk_dequeue_skb_slow(q, skb, packets); |
Jarek Poplawski | ebf0598 | 2008-09-22 22:16:23 -0700 | [diff] [blame] | 155 | } |
Jesper Dangaard Brouer | e543002 | 2017-08-15 21:11:03 +0200 | [diff] [blame] | 156 | trace: |
| 157 | trace_qdisc_dequeue(q, txq, *packets, skb); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 158 | return skb; |
| 159 | } |
| 160 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 161 | /* |
Jesper Dangaard Brouer | 10770bc | 2014-09-02 16:35:33 +0200 | [diff] [blame] | 162 | * Transmit possibly several skbs, and handle the return status as |
Eric Dumazet | f9eb8ae | 2016-06-06 09:37:15 -0700 | [diff] [blame] | 163 | * required. Owning running seqcount bit guarantees that |
Jesper Dangaard Brouer | 10770bc | 2014-09-02 16:35:33 +0200 | [diff] [blame] | 164 | * only one CPU can execute this function. |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 165 | * |
| 166 | * Returns to the caller: |
| 167 | * 0 - queue is empty or throttled. |
| 168 | * >0 - queue is not empty. |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 169 | */ |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 170 | int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
| 171 | struct net_device *dev, struct netdev_queue *txq, |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 172 | spinlock_t *root_lock, bool validate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Peter P Waskiewicz Jr | 5f1a485 | 2007-11-13 20:40:55 -0800 | [diff] [blame] | 174 | int ret = NETDEV_TX_BUSY; |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 175 | |
| 176 | /* And release qdisc */ |
| 177 | spin_unlock(root_lock); |
Herbert Xu | d90df3a | 2007-05-10 04:55:14 -0700 | [diff] [blame] | 178 | |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 179 | /* Note that we validate skb (GSO, checksum, ...) outside of locks */ |
| 180 | if (validate) |
| 181 | skb = validate_xmit_skb_list(skb, dev); |
Patrick McHardy | 572a9d7 | 2009-11-10 06:14:14 +0000 | [diff] [blame] | 182 | |
Lars Persson | 3dcd493fb | 2016-04-12 08:45:52 +0200 | [diff] [blame] | 183 | if (likely(skb)) { |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 184 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
| 185 | if (!netif_xmit_frozen_or_stopped(txq)) |
| 186 | skb = dev_hard_start_xmit(skb, dev, txq, &ret); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 187 | |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 188 | HARD_TX_UNLOCK(dev, txq); |
Lars Persson | 3dcd493fb | 2016-04-12 08:45:52 +0200 | [diff] [blame] | 189 | } else { |
Eric Dumazet | 52fbb29 | 2016-06-09 07:45:11 -0700 | [diff] [blame] | 190 | spin_lock(root_lock); |
Lars Persson | 3dcd493fb | 2016-04-12 08:45:52 +0200 | [diff] [blame] | 191 | return qdisc_qlen(q); |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 192 | } |
Eric Dumazet | 52fbb29 | 2016-06-09 07:45:11 -0700 | [diff] [blame] | 193 | spin_lock(root_lock); |
Jamal Hadi Salim | c716a81 | 2007-06-10 17:31:24 -0700 | [diff] [blame] | 194 | |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 195 | if (dev_xmit_complete(ret)) { |
| 196 | /* Driver sent out skb successfully or skb was consumed */ |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 197 | ret = qdisc_qlen(q); |
Jarek Poplawski | 9a1654b | 2009-11-15 07:20:12 +0000 | [diff] [blame] | 198 | } else { |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 199 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 200 | if (unlikely(ret != NETDEV_TX_BUSY)) |
| 201 | net_warn_ratelimited("BUG %s code %d qlen %d\n", |
| 202 | dev->name, ret, q->q.qlen); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 203 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 204 | ret = dev_requeue_skb(skb, q); |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 205 | } |
| 206 | |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 207 | if (ret && netif_xmit_frozen_or_stopped(txq)) |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 208 | ret = 0; |
| 209 | |
Krishna Kumar | 6c1361a | 2007-06-24 19:56:09 -0700 | [diff] [blame] | 210 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 213 | /* |
| 214 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. |
| 215 | * |
Eric Dumazet | f9eb8ae | 2016-06-06 09:37:15 -0700 | [diff] [blame] | 216 | * running seqcount guarantees only one CPU can process |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 217 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
| 218 | * this queue. |
| 219 | * |
| 220 | * netif_tx_lock serializes accesses to device driver. |
| 221 | * |
| 222 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, |
| 223 | * if one is grabbed, another must be free. |
| 224 | * |
| 225 | * Note, that this procedure can be called by a watchdog timer |
| 226 | * |
| 227 | * Returns to the caller: |
| 228 | * 0 - queue is empty or throttled. |
| 229 | * >0 - queue is not empty. |
| 230 | * |
| 231 | */ |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 232 | static inline int qdisc_restart(struct Qdisc *q, int *packets) |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 233 | { |
| 234 | struct netdev_queue *txq; |
| 235 | struct net_device *dev; |
| 236 | spinlock_t *root_lock; |
| 237 | struct sk_buff *skb; |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 238 | bool validate; |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 239 | |
| 240 | /* Dequeue packet */ |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 241 | skb = dequeue_skb(q, &validate, packets); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 242 | if (unlikely(!skb)) |
| 243 | return 0; |
Daniel Borkmann | 10c51b5623 | 2014-08-27 11:11:27 +0200 | [diff] [blame] | 244 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 245 | root_lock = qdisc_lock(q); |
| 246 | dev = qdisc_dev(q); |
Daniel Borkmann | 10c51b5623 | 2014-08-27 11:11:27 +0200 | [diff] [blame] | 247 | txq = skb_get_tx_queue(dev, skb); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 248 | |
Eric Dumazet | 55a93b3 | 2014-10-03 15:31:07 -0700 | [diff] [blame] | 249 | return sch_direct_xmit(skb, q, dev, txq, root_lock, validate); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 250 | } |
| 251 | |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 252 | void __qdisc_run(struct Qdisc *q) |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 253 | { |
Matthias Tafelmeier | 3d48b53 | 2016-12-29 21:37:21 +0100 | [diff] [blame] | 254 | int quota = dev_tx_weight; |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 255 | int packets; |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 256 | |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 257 | while (qdisc_restart(q, &packets)) { |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 258 | /* |
jamal | d5b8aa1 | 2011-06-26 08:13:54 +0000 | [diff] [blame] | 259 | * Ordered by possible occurrence: Postpone processing if |
| 260 | * 1. we've exceeded packet quota |
| 261 | * 2. another process needs the CPU; |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 262 | */ |
Jesper Dangaard Brouer | b8358d7 | 2014-10-09 12:18:10 +0200 | [diff] [blame] | 263 | quota -= packets; |
| 264 | if (quota <= 0 || need_resched()) { |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 265 | __netif_schedule(q); |
Herbert Xu | 2ba2506 | 2008-03-28 16:25:26 -0700 | [diff] [blame] | 266 | break; |
| 267 | } |
| 268 | } |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 269 | |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 270 | qdisc_run_end(q); |
Herbert Xu | 48d8332 | 2006-06-19 23:57:59 -0700 | [diff] [blame] | 271 | } |
| 272 | |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 273 | unsigned long dev_trans_start(struct net_device *dev) |
| 274 | { |
nikolay@redhat.com | 07ce76a | 2013-08-03 22:07:47 +0200 | [diff] [blame] | 275 | unsigned long val, res; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 276 | unsigned int i; |
| 277 | |
nikolay@redhat.com | 07ce76a | 2013-08-03 22:07:47 +0200 | [diff] [blame] | 278 | if (is_vlan_dev(dev)) |
| 279 | dev = vlan_dev_real_dev(dev); |
Florian Westphal | 9b36627 | 2016-05-03 16:33:14 +0200 | [diff] [blame] | 280 | res = netdev_get_tx_queue(dev, 0)->trans_start; |
| 281 | for (i = 1; i < dev->num_tx_queues; i++) { |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 282 | val = netdev_get_tx_queue(dev, i)->trans_start; |
| 283 | if (val && time_after(val, res)) |
| 284 | res = val; |
| 285 | } |
nikolay@redhat.com | 07ce76a | 2013-08-03 22:07:47 +0200 | [diff] [blame] | 286 | |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 287 | return res; |
| 288 | } |
| 289 | EXPORT_SYMBOL(dev_trans_start); |
| 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | static void dev_watchdog(unsigned long arg) |
| 292 | { |
| 293 | struct net_device *dev = (struct net_device *)arg; |
| 294 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 295 | netif_tx_lock(dev); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 296 | if (!qdisc_tx_is_noop(dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (netif_device_present(dev) && |
| 298 | netif_running(dev) && |
| 299 | netif_carrier_ok(dev)) { |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 300 | int some_queue_timedout = 0; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 301 | unsigned int i; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 302 | unsigned long trans_start; |
Stephen Hemminger | 338f756 | 2006-05-16 15:02:12 -0700 | [diff] [blame] | 303 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 304 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 305 | struct netdev_queue *txq; |
| 306 | |
| 307 | txq = netdev_get_tx_queue(dev, i); |
Florian Westphal | 9b36627 | 2016-05-03 16:33:14 +0200 | [diff] [blame] | 308 | trans_start = txq->trans_start; |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 309 | if (netif_xmit_stopped(txq) && |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 310 | time_after(jiffies, (trans_start + |
| 311 | dev->watchdog_timeo))) { |
| 312 | some_queue_timedout = 1; |
david decotigny | ccf5ff6 | 2011-11-16 12:15:10 +0000 | [diff] [blame] | 313 | txq->trans_timeout++; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 314 | break; |
| 315 | } |
| 316 | } |
| 317 | |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 318 | if (some_queue_timedout) { |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 319 | 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] | 320 | dev->name, netdev_drivername(dev), i); |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 321 | dev->netdev_ops->ndo_tx_timeout(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 323 | if (!mod_timer(&dev->watchdog_timer, |
| 324 | round_jiffies(jiffies + |
| 325 | dev->watchdog_timeo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | dev_hold(dev); |
| 327 | } |
| 328 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 329 | netif_tx_unlock(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
| 331 | dev_put(dev); |
| 332 | } |
| 333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | void __netdev_watchdog_up(struct net_device *dev) |
| 335 | { |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 336 | if (dev->netdev_ops->ndo_tx_timeout) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | if (dev->watchdog_timeo <= 0) |
| 338 | dev->watchdog_timeo = 5*HZ; |
Venkatesh Pallipadi | 60468d5 | 2007-05-31 21:28:44 -0700 | [diff] [blame] | 339 | if (!mod_timer(&dev->watchdog_timer, |
| 340 | round_jiffies(jiffies + dev->watchdog_timeo))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | dev_hold(dev); |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | static void dev_watchdog_up(struct net_device *dev) |
| 346 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | __netdev_watchdog_up(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | static void dev_watchdog_down(struct net_device *dev) |
| 351 | { |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 352 | netif_tx_lock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | if (del_timer(&dev->watchdog_timer)) |
Stephen Hemminger | 1533306 | 2006-03-20 22:32:28 -0800 | [diff] [blame] | 354 | dev_put(dev); |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 355 | netif_tx_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 358 | /** |
| 359 | * netif_carrier_on - set carrier |
| 360 | * @dev: network device |
| 361 | * |
| 362 | * Device has detected that carrier. |
| 363 | */ |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 364 | void netif_carrier_on(struct net_device *dev) |
| 365 | { |
Jeff Garzik | bfaae0f | 2007-10-17 23:26:43 -0700 | [diff] [blame] | 366 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 367 | if (dev->reg_state == NETREG_UNINITIALIZED) |
| 368 | return; |
david decotigny | 2d3b479 | 2014-03-29 09:48:35 -0700 | [diff] [blame] | 369 | atomic_inc(&dev->carrier_changes); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 370 | linkwatch_fire_event(dev); |
Jeff Garzik | bfaae0f | 2007-10-17 23:26:43 -0700 | [diff] [blame] | 371 | if (netif_running(dev)) |
| 372 | __netdev_watchdog_up(dev); |
| 373 | } |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 374 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 375 | EXPORT_SYMBOL(netif_carrier_on); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 376 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 377 | /** |
| 378 | * netif_carrier_off - clear carrier |
| 379 | * @dev: network device |
| 380 | * |
| 381 | * Device has detected loss of carrier. |
| 382 | */ |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 383 | void netif_carrier_off(struct net_device *dev) |
| 384 | { |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 385 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
| 386 | if (dev->reg_state == NETREG_UNINITIALIZED) |
| 387 | return; |
david decotigny | 2d3b479 | 2014-03-29 09:48:35 -0700 | [diff] [blame] | 388 | atomic_inc(&dev->carrier_changes); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 389 | linkwatch_fire_event(dev); |
David S. Miller | b473001 | 2008-11-19 15:33:54 -0800 | [diff] [blame] | 390 | } |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 391 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 392 | EXPORT_SYMBOL(netif_carrier_off); |
Denis Vlasenko | 0a242ef | 2005-08-11 15:32:53 -0700 | [diff] [blame] | 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
| 395 | under all circumstances. It is difficult to invent anything faster or |
| 396 | cheaper. |
| 397 | */ |
| 398 | |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 399 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
| 400 | struct sk_buff **to_free) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | { |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 402 | __qdisc_drop(skb, to_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | return NET_XMIT_CN; |
| 404 | } |
| 405 | |
Yang Yingliang | 82d567c | 2013-12-10 20:55:31 +0800 | [diff] [blame] | 406 | static struct sk_buff *noop_dequeue(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | { |
| 408 | return NULL; |
| 409 | } |
| 410 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 411 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | .id = "noop", |
| 413 | .priv_size = 0, |
| 414 | .enqueue = noop_enqueue, |
| 415 | .dequeue = noop_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 416 | .peek = noop_dequeue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | .owner = THIS_MODULE, |
| 418 | }; |
| 419 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 420 | static struct netdev_queue noop_netdev_queue = { |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 421 | .qdisc = &noop_qdisc, |
Jarek Poplawski | 9f3ffae | 2008-10-19 23:37:47 -0700 | [diff] [blame] | 422 | .qdisc_sleeping = &noop_qdisc, |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 423 | }; |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | struct Qdisc noop_qdisc = { |
| 426 | .enqueue = noop_enqueue, |
| 427 | .dequeue = noop_dequeue, |
| 428 | .flags = TCQ_F_BUILTIN, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 429 | .ops = &noop_qdisc_ops, |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 430 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 431 | .dev_queue = &noop_netdev_queue, |
Eric Dumazet | f9eb8ae | 2016-06-06 09:37:15 -0700 | [diff] [blame] | 432 | .running = SEQCNT_ZERO(noop_qdisc.running), |
Eric Dumazet | 7b5edbc | 2010-10-15 19:22:34 +0000 | [diff] [blame] | 433 | .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | }; |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 435 | EXPORT_SYMBOL(noop_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
Phil Sutter | d66d6c3 | 2015-08-27 21:21:38 +0200 | [diff] [blame] | 437 | static int noqueue_init(struct Qdisc *qdisc, struct nlattr *opt) |
| 438 | { |
| 439 | /* register_qdisc() assigns a default of noop_enqueue if unset, |
| 440 | * but __dev_queue_xmit() treats noqueue only as such |
| 441 | * if this is NULL - so clear it here. */ |
| 442 | qdisc->enqueue = NULL; |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | .id = "noqueue", |
| 448 | .priv_size = 0, |
Phil Sutter | d66d6c3 | 2015-08-27 21:21:38 +0200 | [diff] [blame] | 449 | .init = noqueue_init, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | .enqueue = noop_enqueue, |
| 451 | .dequeue = noop_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 452 | .peek = noop_dequeue, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | .owner = THIS_MODULE, |
| 454 | }; |
| 455 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 456 | static const u8 prio2band[TC_PRIO_MAX + 1] = { |
| 457 | 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 |
| 458 | }; |
Thomas Graf | 321090e | 2005-06-18 22:58:35 -0700 | [diff] [blame] | 459 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 460 | /* 3-band FIFO queue: old style, but should be a bit faster than |
| 461 | generic prio+fifo combination. |
| 462 | */ |
| 463 | |
| 464 | #define PFIFO_FAST_BANDS 3 |
| 465 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 466 | /* |
| 467 | * Private data for a pfifo_fast scheduler containing: |
| 468 | * - queues for the three band |
| 469 | * - bitmap indicating which of the bands contain skbs |
| 470 | */ |
| 471 | struct pfifo_fast_priv { |
| 472 | u32 bitmap; |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 473 | struct qdisc_skb_head q[PFIFO_FAST_BANDS]; |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 474 | }; |
| 475 | |
| 476 | /* |
| 477 | * Convert a bitmap to the first band number where an skb is queued, where: |
| 478 | * bitmap=0 means there are no skbs on any band. |
| 479 | * bitmap=1 means there is an skb on band 0. |
| 480 | * bitmap=7 means there are skbs on all 3 bands, etc. |
| 481 | */ |
| 482 | static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0}; |
| 483 | |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 484 | static inline struct qdisc_skb_head *band2list(struct pfifo_fast_priv *priv, |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 485 | int band) |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 486 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 487 | return priv->q + band; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 488 | } |
| 489 | |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 490 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
| 491 | struct sk_buff **to_free) |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 492 | { |
Florian Westphal | 97d0678 | 2016-09-18 00:57:31 +0200 | [diff] [blame] | 493 | if (qdisc->q.qlen < qdisc_dev(qdisc)->tx_queue_len) { |
Krishna Kumar | a453e06 | 2009-08-30 22:20:28 -0700 | [diff] [blame] | 494 | int band = prio2band[skb->priority & TC_PRIO_MAX]; |
| 495 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 496 | struct qdisc_skb_head *list = band2list(priv, band); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 497 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 498 | priv->bitmap |= (1 << band); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 499 | qdisc->q.qlen++; |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 500 | return __qdisc_enqueue_tail(skb, qdisc, list); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 501 | } |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 502 | |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 503 | return qdisc_drop(skb, qdisc, to_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | } |
| 505 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 506 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 508 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
| 509 | int band = bitmap2band[priv->bitmap]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 511 | if (likely(band >= 0)) { |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 512 | struct qdisc_skb_head *qh = band2list(priv, band); |
| 513 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
Florian Westphal | ec32336 | 2016-09-18 00:57:32 +0200 | [diff] [blame] | 514 | |
| 515 | if (likely(skb != NULL)) { |
| 516 | qdisc_qstats_backlog_dec(qdisc, skb); |
| 517 | qdisc_bstats_update(qdisc, skb); |
| 518 | } |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 519 | |
| 520 | qdisc->q.qlen--; |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 521 | if (qh->qlen == 0) |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 522 | priv->bitmap &= ~(1 << band); |
| 523 | |
| 524 | return skb; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 525 | } |
Thomas Graf | f87a9c3 | 2005-06-18 22:58:53 -0700 | [diff] [blame] | 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | return NULL; |
| 528 | } |
| 529 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 530 | static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc) |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 531 | { |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 532 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
| 533 | int band = bitmap2band[priv->bitmap]; |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 534 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 535 | if (band >= 0) { |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 536 | struct qdisc_skb_head *qh = band2list(priv, band); |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 537 | |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 538 | return qh->head; |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | return NULL; |
| 542 | } |
| 543 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 544 | static void pfifo_fast_reset(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 546 | int prio; |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 547 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 548 | |
| 549 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
Eric Dumazet | 1b5c549 | 2016-06-13 20:21:50 -0700 | [diff] [blame] | 550 | __qdisc_reset_queue(band2list(priv, prio)); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 551 | |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 552 | priv->bitmap = 0; |
Thomas Graf | 821d24a | 2005-06-18 22:58:15 -0700 | [diff] [blame] | 553 | qdisc->qstats.backlog = 0; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 554 | qdisc->q.qlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
| 556 | |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 557 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
| 558 | { |
| 559 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; |
| 560 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 561 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1); |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 562 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
| 563 | goto nla_put_failure; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 564 | return skb->len; |
| 565 | |
| 566 | nla_put_failure: |
| 567 | return -1; |
| 568 | } |
| 569 | |
| 570 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt) |
| 571 | { |
| 572 | int prio; |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 573 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 574 | |
| 575 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 576 | qdisc_skb_head_init(band2list(priv, prio)); |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 577 | |
Eric Dumazet | 2362493 | 2011-01-21 16:26:09 -0800 | [diff] [blame] | 578 | /* Can by-pass the queue discipline */ |
| 579 | qdisc->flags |= TCQ_F_CAN_BYPASS; |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 580 | return 0; |
| 581 | } |
| 582 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 583 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 584 | .id = "pfifo_fast", |
Krishna Kumar | fd3ae5e | 2009-08-18 21:55:59 +0000 | [diff] [blame] | 585 | .priv_size = sizeof(struct pfifo_fast_priv), |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 586 | .enqueue = pfifo_fast_enqueue, |
| 587 | .dequeue = pfifo_fast_dequeue, |
Jarek Poplawski | 99c0db2 | 2008-10-31 00:45:27 -0700 | [diff] [blame] | 588 | .peek = pfifo_fast_peek, |
David S. Miller | d3678b4 | 2008-07-21 09:56:13 -0700 | [diff] [blame] | 589 | .init = pfifo_fast_init, |
| 590 | .reset = pfifo_fast_reset, |
| 591 | .dump = pfifo_fast_dump, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | .owner = THIS_MODULE, |
| 593 | }; |
Eric Dumazet | 1f27cde | 2016-03-02 08:21:43 -0800 | [diff] [blame] | 594 | EXPORT_SYMBOL(pfifo_fast_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 596 | static struct lock_class_key qdisc_tx_busylock; |
Eric Dumazet | f9eb8ae | 2016-06-06 09:37:15 -0700 | [diff] [blame] | 597 | static struct lock_class_key qdisc_running_key; |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 598 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 599 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
stephen hemminger | d2a7f26 | 2013-08-31 10:15:50 -0700 | [diff] [blame] | 600 | const struct Qdisc_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { |
| 602 | void *p; |
| 603 | struct Qdisc *sch; |
Eric Dumazet | d276055 | 2011-03-03 11:10:02 -0800 | [diff] [blame] | 604 | unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 605 | int err = -ENOBUFS; |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 606 | struct net_device *dev = dev_queue->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
Eric Dumazet | f2cd2d3 | 2010-11-29 08:14:37 +0000 | [diff] [blame] | 608 | p = kzalloc_node(size, GFP_KERNEL, |
| 609 | netdev_queue_numa_node_read(dev_queue)); |
| 610 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | if (!p) |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 612 | goto errout; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 613 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
Eric Dumazet | d276055 | 2011-03-03 11:10:02 -0800 | [diff] [blame] | 614 | /* if we got non aligned memory, ask more and do alignment ourself */ |
| 615 | if (sch != p) { |
| 616 | kfree(p); |
| 617 | p = kzalloc_node(size + QDISC_ALIGNTO - 1, GFP_KERNEL, |
| 618 | netdev_queue_numa_node_read(dev_queue)); |
| 619 | if (!p) |
| 620 | goto errout; |
| 621 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
| 622 | sch->padded = (char *) sch - (char *) p; |
| 623 | } |
Florian Westphal | 48da34b | 2016-09-18 00:57:34 +0200 | [diff] [blame] | 624 | qdisc_skb_head_init(&sch->q); |
| 625 | spin_lock_init(&sch->q.lock); |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 626 | |
Eric Dumazet | 79640a4 | 2010-06-02 05:09:29 -0700 | [diff] [blame] | 627 | spin_lock_init(&sch->busylock); |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 628 | lockdep_set_class(&sch->busylock, |
| 629 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); |
| 630 | |
Eric Dumazet | f9eb8ae | 2016-06-06 09:37:15 -0700 | [diff] [blame] | 631 | seqcount_init(&sch->running); |
| 632 | lockdep_set_class(&sch->running, |
| 633 | dev->qdisc_running_key ?: &qdisc_running_key); |
| 634 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | sch->ops = ops; |
| 636 | sch->enqueue = ops->enqueue; |
| 637 | sch->dequeue = ops->dequeue; |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 638 | sch->dev_queue = dev_queue; |
Eric Dumazet | 23d3b8b | 2012-09-05 01:02:56 +0000 | [diff] [blame] | 639 | dev_hold(dev); |
Reshetova, Elena | 7b93640 | 2017-07-04 15:53:07 +0300 | [diff] [blame] | 640 | refcount_set(&sch->refcnt, 1); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 641 | |
| 642 | return sch; |
| 643 | errout: |
WANG Cong | 01e123d | 2008-06-27 19:51:35 -0700 | [diff] [blame] | 644 | return ERR_PTR(err); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 645 | } |
| 646 | |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 647 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
stephen hemminger | d2a7f26 | 2013-08-31 10:15:50 -0700 | [diff] [blame] | 648 | const struct Qdisc_ops *ops, |
| 649 | unsigned int parentid) |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 650 | { |
| 651 | struct Qdisc *sch; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 652 | |
stephen hemminger | 6da7c8f | 2013-08-27 16:19:08 -0700 | [diff] [blame] | 653 | if (!try_module_get(ops->owner)) |
Eric Dumazet | 166ee5b | 2016-08-24 09:39:02 -0700 | [diff] [blame] | 654 | return NULL; |
stephen hemminger | 6da7c8f | 2013-08-27 16:19:08 -0700 | [diff] [blame] | 655 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 656 | sch = qdisc_alloc(dev_queue, ops); |
Eric Dumazet | 166ee5b | 2016-08-24 09:39:02 -0700 | [diff] [blame] | 657 | if (IS_ERR(sch)) { |
| 658 | module_put(ops->owner); |
| 659 | return NULL; |
| 660 | } |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 661 | sch->parent = parentid; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 662 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | if (!ops->init || ops->init(sch, NULL) == 0) |
| 664 | return sch; |
| 665 | |
Thomas Graf | 0fbbeb1 | 2005-08-23 10:12:44 -0700 | [diff] [blame] | 666 | qdisc_destroy(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return NULL; |
| 668 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 669 | EXPORT_SYMBOL(qdisc_create_dflt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 671 | /* Under qdisc_lock(qdisc) and BH! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | void qdisc_reset(struct Qdisc *qdisc) |
| 674 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 675 | const struct Qdisc_ops *ops = qdisc->ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
| 677 | if (ops->reset) |
| 678 | ops->reset(qdisc); |
Jarek Poplawski | 67305eb | 2008-11-03 02:52:50 -0800 | [diff] [blame] | 679 | |
Eric Dumazet | 4d202a0 | 2016-06-21 23:16:52 -0700 | [diff] [blame] | 680 | kfree_skb(qdisc->skb_bad_txq); |
| 681 | qdisc->skb_bad_txq = NULL; |
| 682 | |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 683 | if (qdisc->gso_skb) { |
Jesper Dangaard Brouer | 3f3c7ee | 2014-09-03 12:12:50 +0200 | [diff] [blame] | 684 | kfree_skb_list(qdisc->gso_skb); |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 685 | qdisc->gso_skb = NULL; |
Krishna Kumar | bbd8a0d | 2009-08-06 01:44:21 +0000 | [diff] [blame] | 686 | } |
Eric Dumazet | 4d202a0 | 2016-06-21 23:16:52 -0700 | [diff] [blame] | 687 | qdisc->q.qlen = 0; |
Konstantin Khlebnikov | c8e1812 | 2017-09-20 15:45:36 +0300 | [diff] [blame] | 688 | qdisc->qstats.backlog = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 690 | EXPORT_SYMBOL(qdisc_reset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
Eric Dumazet | 5d944c6 | 2010-03-31 07:06:04 +0000 | [diff] [blame] | 692 | static void qdisc_rcu_free(struct rcu_head *head) |
| 693 | { |
| 694 | struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head); |
| 695 | |
John Fastabend | 73c20a8 | 2016-01-05 09:11:36 -0800 | [diff] [blame] | 696 | if (qdisc_is_percpu_stats(qdisc)) { |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 697 | free_percpu(qdisc->cpu_bstats); |
John Fastabend | 73c20a8 | 2016-01-05 09:11:36 -0800 | [diff] [blame] | 698 | free_percpu(qdisc->cpu_qstats); |
| 699 | } |
John Fastabend | 22e0f8b | 2014-09-28 11:52:56 -0700 | [diff] [blame] | 700 | |
Eric Dumazet | 5d944c6 | 2010-03-31 07:06:04 +0000 | [diff] [blame] | 701 | kfree((char *) qdisc - qdisc->padded); |
| 702 | } |
| 703 | |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 704 | void qdisc_destroy(struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 706 | const struct Qdisc_ops *ops = qdisc->ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 708 | if (qdisc->flags & TCQ_F_BUILTIN || |
Reshetova, Elena | 7b93640 | 2017-07-04 15:53:07 +0300 | [diff] [blame] | 709 | !refcount_dec_and_test(&qdisc->refcnt)) |
David S. Miller | 1e0d5a5 | 2008-08-17 22:31:26 -0700 | [diff] [blame] | 710 | return; |
| 711 | |
David S. Miller | 3a682fb | 2008-07-20 18:13:01 -0700 | [diff] [blame] | 712 | #ifdef CONFIG_NET_SCHED |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 713 | qdisc_hash_del(qdisc); |
Jarek Poplawski | f6e0b23 | 2008-08-22 03:24:05 -0700 | [diff] [blame] | 714 | |
Eric Dumazet | a2da570 | 2011-01-20 03:48:19 +0000 | [diff] [blame] | 715 | qdisc_put_stab(rtnl_dereference(qdisc->stab)); |
David S. Miller | 3a682fb | 2008-07-20 18:13:01 -0700 | [diff] [blame] | 716 | #endif |
Eric Dumazet | 1c0d32f | 2016-12-04 09:48:16 -0800 | [diff] [blame] | 717 | gen_kill_estimator(&qdisc->rate_est); |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 718 | if (ops->reset) |
| 719 | ops->reset(qdisc); |
| 720 | if (ops->destroy) |
| 721 | ops->destroy(qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 723 | module_put(ops->owner); |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 724 | dev_put(qdisc_dev(qdisc)); |
David S. Miller | 8a34c5d | 2008-07-17 00:47:45 -0700 | [diff] [blame] | 725 | |
Jesper Dangaard Brouer | 3f3c7ee | 2014-09-03 12:12:50 +0200 | [diff] [blame] | 726 | kfree_skb_list(qdisc->gso_skb); |
Eric Dumazet | 4d202a0 | 2016-06-21 23:16:52 -0700 | [diff] [blame] | 727 | kfree_skb(qdisc->skb_bad_txq); |
Eric Dumazet | 5d944c6 | 2010-03-31 07:06:04 +0000 | [diff] [blame] | 728 | /* |
| 729 | * gen_estimator est_timer() might access qdisc->q.lock, |
| 730 | * wait a RCU grace period before freeing qdisc. |
| 731 | */ |
| 732 | call_rcu(&qdisc->rcu_head, qdisc_rcu_free); |
David S. Miller | 8a34c5d | 2008-07-17 00:47:45 -0700 | [diff] [blame] | 733 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 734 | EXPORT_SYMBOL(qdisc_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Patrick McHardy | 589983c | 2009-09-04 06:41:20 +0000 | [diff] [blame] | 736 | /* Attach toplevel qdisc to device queue. */ |
| 737 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
| 738 | struct Qdisc *qdisc) |
| 739 | { |
| 740 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; |
| 741 | spinlock_t *root_lock; |
| 742 | |
| 743 | root_lock = qdisc_lock(oqdisc); |
| 744 | spin_lock_bh(root_lock); |
| 745 | |
| 746 | /* Prune old scheduler */ |
Reshetova, Elena | 7b93640 | 2017-07-04 15:53:07 +0300 | [diff] [blame] | 747 | if (oqdisc && refcount_read(&oqdisc->refcnt) <= 1) |
Patrick McHardy | 589983c | 2009-09-04 06:41:20 +0000 | [diff] [blame] | 748 | qdisc_reset(oqdisc); |
| 749 | |
| 750 | /* ... and graft new one */ |
| 751 | if (qdisc == NULL) |
| 752 | qdisc = &noop_qdisc; |
| 753 | dev_queue->qdisc_sleeping = qdisc; |
| 754 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); |
| 755 | |
| 756 | spin_unlock_bh(root_lock); |
| 757 | |
| 758 | return oqdisc; |
| 759 | } |
John Fastabend | b8970f0 | 2011-01-17 08:06:09 +0000 | [diff] [blame] | 760 | EXPORT_SYMBOL(dev_graft_qdisc); |
Patrick McHardy | 589983c | 2009-09-04 06:41:20 +0000 | [diff] [blame] | 761 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 762 | static void attach_one_default_qdisc(struct net_device *dev, |
| 763 | struct netdev_queue *dev_queue, |
| 764 | void *_unused) |
| 765 | { |
Phil Sutter | 3e692f2 | 2015-08-27 21:21:39 +0200 | [diff] [blame] | 766 | struct Qdisc *qdisc; |
| 767 | const struct Qdisc_ops *ops = default_qdisc_ops; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 768 | |
Phil Sutter | 3e692f2 | 2015-08-27 21:21:39 +0200 | [diff] [blame] | 769 | if (dev->priv_flags & IFF_NO_QUEUE) |
| 770 | ops = &noqueue_qdisc_ops; |
| 771 | |
| 772 | qdisc = qdisc_create_dflt(dev_queue, ops, TC_H_ROOT); |
| 773 | if (!qdisc) { |
| 774 | netdev_info(dev, "activation failed\n"); |
| 775 | return; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 776 | } |
Phil Sutter | 3e692f2 | 2015-08-27 21:21:39 +0200 | [diff] [blame] | 777 | if (!netif_is_multiqueue(dev)) |
Eric Dumazet | 4eaf3b8 | 2015-12-01 20:08:51 -0800 | [diff] [blame] | 778 | qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 779 | dev_queue->qdisc_sleeping = qdisc; |
| 780 | } |
| 781 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 782 | static void attach_default_qdiscs(struct net_device *dev) |
| 783 | { |
| 784 | struct netdev_queue *txq; |
| 785 | struct Qdisc *qdisc; |
| 786 | |
| 787 | txq = netdev_get_tx_queue(dev, 0); |
| 788 | |
Phil Sutter | 4b46995 | 2015-08-13 19:01:07 +0200 | [diff] [blame] | 789 | if (!netif_is_multiqueue(dev) || |
Phil Sutter | 4b46995 | 2015-08-13 19:01:07 +0200 | [diff] [blame] | 790 | dev->priv_flags & IFF_NO_QUEUE) { |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 791 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
| 792 | dev->qdisc = txq->qdisc_sleeping; |
Eric Dumazet | 551143d | 2017-08-24 21:12:28 -0700 | [diff] [blame] | 793 | qdisc_refcount_inc(dev->qdisc); |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 794 | } else { |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 795 | qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT); |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 796 | if (qdisc) { |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 797 | dev->qdisc = qdisc; |
Eric Dumazet | e57a784 | 2013-12-12 15:41:56 -0800 | [diff] [blame] | 798 | qdisc->ops->attach(qdisc); |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 799 | } |
| 800 | } |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 801 | #ifdef CONFIG_NET_SCHED |
WANG Cong | 92f9170 | 2017-04-04 18:51:30 -0700 | [diff] [blame] | 802 | if (dev->qdisc != &noop_qdisc) |
Jiri Kosina | 49b4997 | 2017-03-08 16:03:32 +0100 | [diff] [blame] | 803 | qdisc_hash_add(dev->qdisc, false); |
Jiri Kosina | 59cc1f6 | 2016-08-10 11:05:15 +0200 | [diff] [blame] | 804 | #endif |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 805 | } |
| 806 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 807 | static void transition_one_qdisc(struct net_device *dev, |
| 808 | struct netdev_queue *dev_queue, |
| 809 | void *_need_watchdog) |
| 810 | { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 811 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 812 | int *need_watchdog_p = _need_watchdog; |
| 813 | |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 814 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
| 815 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); |
| 816 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 817 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
Phil Sutter | 3e692f2 | 2015-08-27 21:21:39 +0200 | [diff] [blame] | 818 | if (need_watchdog_p) { |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 819 | dev_queue->trans_start = 0; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 820 | *need_watchdog_p = 1; |
Eric Dumazet | 9d21493 | 2009-05-17 20:55:16 -0700 | [diff] [blame] | 821 | } |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 822 | } |
| 823 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | void dev_activate(struct net_device *dev) |
| 825 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 826 | int need_watchdog; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | /* No queueing discipline is attached to device; |
stephen hemminger | 6da7c8f | 2013-08-27 16:19:08 -0700 | [diff] [blame] | 829 | * create default one for devices, which need queueing |
| 830 | * and noqueue_qdisc for virtual interfaces |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | */ |
| 832 | |
David S. Miller | 6ec1c69 | 2009-09-06 01:58:51 -0700 | [diff] [blame] | 833 | if (dev->qdisc == &noop_qdisc) |
| 834 | attach_default_qdiscs(dev); |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 835 | |
Tommy S. Christensen | cacaddf | 2005-05-03 16:18:52 -0700 | [diff] [blame] | 836 | if (!netif_carrier_ok(dev)) |
| 837 | /* Delay activation until next carrier-on event */ |
| 838 | return; |
| 839 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 840 | need_watchdog = 0; |
| 841 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 842 | if (dev_ingress_queue(dev)) |
| 843 | transition_one_qdisc(dev, dev_ingress_queue(dev), NULL); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 844 | |
| 845 | if (need_watchdog) { |
Florian Westphal | 860e953 | 2016-05-03 16:33:13 +0200 | [diff] [blame] | 846 | netif_trans_update(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | dev_watchdog_up(dev); |
| 848 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 849 | } |
John Fastabend | b8970f0 | 2011-01-17 08:06:09 +0000 | [diff] [blame] | 850 | EXPORT_SYMBOL(dev_activate); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 851 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 852 | static void dev_deactivate_queue(struct net_device *dev, |
| 853 | struct netdev_queue *dev_queue, |
| 854 | void *_qdisc_default) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 855 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 856 | struct Qdisc *qdisc_default = _qdisc_default; |
David S. Miller | 970565b | 2008-07-08 23:10:33 -0700 | [diff] [blame] | 857 | struct Qdisc *qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 858 | |
John Fastabend | 46e5da4 | 2014-09-12 20:04:52 -0700 | [diff] [blame] | 859 | qdisc = rtnl_dereference(dev_queue->qdisc); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 860 | if (qdisc) { |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 861 | spin_lock_bh(qdisc_lock(qdisc)); |
| 862 | |
David S. Miller | a9312ae | 2008-08-17 21:51:03 -0700 | [diff] [blame] | 863 | if (!(qdisc->flags & TCQ_F_BUILTIN)) |
| 864 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); |
| 865 | |
Jarek Poplawski | f7a54c1 | 2008-08-27 02:22:07 -0700 | [diff] [blame] | 866 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 867 | qdisc_reset(qdisc); |
David S. Miller | d3b753d | 2008-07-15 20:14:35 -0700 | [diff] [blame] | 868 | |
David S. Miller | 8387400 | 2008-07-17 00:53:03 -0700 | [diff] [blame] | 869 | spin_unlock_bh(qdisc_lock(qdisc)); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 870 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | } |
| 872 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 873 | static bool some_qdisc_is_busy(struct net_device *dev) |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 874 | { |
| 875 | unsigned int i; |
| 876 | |
| 877 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 878 | struct netdev_queue *dev_queue; |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 879 | spinlock_t *root_lock; |
David S. Miller | e2627c8 | 2008-07-16 00:56:32 -0700 | [diff] [blame] | 880 | struct Qdisc *q; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 881 | int val; |
| 882 | |
| 883 | dev_queue = netdev_get_tx_queue(dev, i); |
David S. Miller | b9a3b11 | 2008-08-13 15:18:38 -0700 | [diff] [blame] | 884 | q = dev_queue->qdisc_sleeping; |
David S. Miller | 5fb6622 | 2008-08-02 20:02:43 -0700 | [diff] [blame] | 885 | root_lock = qdisc_lock(q); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 886 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 887 | spin_lock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 888 | |
Eric Dumazet | bc135b2 | 2010-06-02 03:23:51 -0700 | [diff] [blame] | 889 | val = (qdisc_is_running(q) || |
David S. Miller | b9a3b11 | 2008-08-13 15:18:38 -0700 | [diff] [blame] | 890 | test_bit(__QDISC_STATE_SCHED, &q->state)); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 891 | |
David S. Miller | 4335cd2 | 2008-08-17 21:58:07 -0700 | [diff] [blame] | 892 | spin_unlock_bh(root_lock); |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 893 | |
| 894 | if (val) |
| 895 | return true; |
| 896 | } |
| 897 | return false; |
| 898 | } |
| 899 | |
Eric Dumazet | 3137663 | 2011-05-19 23:42:09 +0000 | [diff] [blame] | 900 | /** |
| 901 | * dev_deactivate_many - deactivate transmissions on several devices |
| 902 | * @head: list of devices to deactivate |
| 903 | * |
| 904 | * This function returns only when all outstanding transmissions |
| 905 | * have completed, unless all devices are in dismantle phase. |
| 906 | */ |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 907 | void dev_deactivate_many(struct list_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | { |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 909 | struct net_device *dev; |
Eric Dumazet | 3137663 | 2011-05-19 23:42:09 +0000 | [diff] [blame] | 910 | bool sync_needed = false; |
Herbert Xu | 41a23b0 | 2007-05-10 14:12:47 -0700 | [diff] [blame] | 911 | |
Eric W. Biederman | 5cde282 | 2013-10-05 19:26:05 -0700 | [diff] [blame] | 912 | list_for_each_entry(dev, head, close_list) { |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 913 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, |
| 914 | &noop_qdisc); |
| 915 | if (dev_ingress_queue(dev)) |
| 916 | dev_deactivate_queue(dev, dev_ingress_queue(dev), |
| 917 | &noop_qdisc); |
| 918 | |
| 919 | dev_watchdog_down(dev); |
Eric Dumazet | 3137663 | 2011-05-19 23:42:09 +0000 | [diff] [blame] | 920 | sync_needed |= !dev->dismantle; |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 921 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | |
Eric Dumazet | 3137663 | 2011-05-19 23:42:09 +0000 | [diff] [blame] | 923 | /* Wait for outstanding qdisc-less dev_queue_xmit calls. |
| 924 | * This is avoided if all devices are in dismantle phase : |
| 925 | * Caller will call synchronize_net() for us |
| 926 | */ |
| 927 | if (sync_needed) |
| 928 | synchronize_net(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | |
Herbert Xu | d4828d8 | 2006-06-22 02:28:18 -0700 | [diff] [blame] | 930 | /* Wait for outstanding qdisc_run calls. */ |
Eric W. Biederman | 5cde282 | 2013-10-05 19:26:05 -0700 | [diff] [blame] | 931 | list_for_each_entry(dev, head, close_list) |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 932 | while (some_qdisc_is_busy(dev)) |
| 933 | yield(); |
| 934 | } |
| 935 | |
| 936 | void dev_deactivate(struct net_device *dev) |
| 937 | { |
| 938 | LIST_HEAD(single); |
| 939 | |
Eric W. Biederman | 5cde282 | 2013-10-05 19:26:05 -0700 | [diff] [blame] | 940 | list_add(&dev->close_list, &single); |
Octavian Purdila | 4434572 | 2010-12-13 12:44:07 +0000 | [diff] [blame] | 941 | dev_deactivate_many(&single); |
Eric W. Biederman | 5f04d50 | 2011-02-20 11:49:45 -0800 | [diff] [blame] | 942 | list_del(&single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | } |
John Fastabend | b8970f0 | 2011-01-17 08:06:09 +0000 | [diff] [blame] | 944 | EXPORT_SYMBOL(dev_deactivate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 946 | static void dev_init_scheduler_queue(struct net_device *dev, |
| 947 | struct netdev_queue *dev_queue, |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 948 | void *_qdisc) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 949 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 950 | struct Qdisc *qdisc = _qdisc; |
| 951 | |
John Fastabend | 46e5da4 | 2014-09-12 20:04:52 -0700 | [diff] [blame] | 952 | rcu_assign_pointer(dev_queue->qdisc, qdisc); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 953 | dev_queue->qdisc_sleeping = qdisc; |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 954 | } |
| 955 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | void dev_init_scheduler(struct net_device *dev) |
| 957 | { |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 958 | dev->qdisc = &noop_qdisc; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 959 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 960 | if (dev_ingress_queue(dev)) |
| 961 | dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 963 | setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | } |
| 965 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 966 | static void shutdown_scheduler_queue(struct net_device *dev, |
| 967 | struct netdev_queue *dev_queue, |
| 968 | void *_qdisc_default) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | { |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 970 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 971 | struct Qdisc *qdisc_default = _qdisc_default; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 973 | if (qdisc) { |
Jarek Poplawski | f7a54c1 | 2008-08-27 02:22:07 -0700 | [diff] [blame] | 974 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 975 | dev_queue->qdisc_sleeping = qdisc_default; |
| 976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | qdisc_destroy(qdisc); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 978 | } |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 979 | } |
| 980 | |
| 981 | void dev_shutdown(struct net_device *dev) |
| 982 | { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 983 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
Eric Dumazet | 24824a0 | 2010-10-02 06:11:55 +0000 | [diff] [blame] | 984 | if (dev_ingress_queue(dev)) |
| 985 | shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); |
Patrick McHardy | af356af | 2009-09-04 06:41:18 +0000 | [diff] [blame] | 986 | qdisc_destroy(dev->qdisc); |
| 987 | dev->qdisc = &noop_qdisc; |
| 988 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 989 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | } |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 991 | |
Eric Dumazet | 01cb71d | 2013-06-02 13:55:05 +0000 | [diff] [blame] | 992 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
Eric Dumazet | 3e1e3aa | 2013-09-19 09:10:03 -0700 | [diff] [blame] | 993 | const struct tc_ratespec *conf, |
| 994 | u64 rate64) |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 995 | { |
Eric Dumazet | 01cb71d | 2013-06-02 13:55:05 +0000 | [diff] [blame] | 996 | memset(r, 0, sizeof(*r)); |
| 997 | r->overhead = conf->overhead; |
Eric Dumazet | 3e1e3aa | 2013-09-19 09:10:03 -0700 | [diff] [blame] | 998 | r->rate_bytes_ps = max_t(u64, conf->rate, rate64); |
Jesper Dangaard Brouer | 8a8e3d8 | 2013-08-14 23:47:11 +0200 | [diff] [blame] | 999 | r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK); |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 1000 | r->mult = 1; |
| 1001 | /* |
Eric Dumazet | 130d3d6 | 2013-06-06 13:56:19 -0700 | [diff] [blame] | 1002 | * The deal here is to replace a divide by a reciprocal one |
| 1003 | * in fast path (a reciprocal divide is a multiply and a shift) |
| 1004 | * |
| 1005 | * Normal formula would be : |
| 1006 | * time_in_ns = (NSEC_PER_SEC * len) / rate_bps |
| 1007 | * |
| 1008 | * We compute mult/shift to use instead : |
| 1009 | * time_in_ns = (len * mult) >> shift; |
| 1010 | * |
| 1011 | * We try to get the highest possible mult value for accuracy, |
| 1012 | * but have to make sure no overflows will ever happen. |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 1013 | */ |
Eric Dumazet | 130d3d6 | 2013-06-06 13:56:19 -0700 | [diff] [blame] | 1014 | if (r->rate_bytes_ps > 0) { |
| 1015 | u64 factor = NSEC_PER_SEC; |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 1016 | |
Eric Dumazet | 130d3d6 | 2013-06-06 13:56:19 -0700 | [diff] [blame] | 1017 | for (;;) { |
| 1018 | r->mult = div64_u64(factor, r->rate_bytes_ps); |
| 1019 | if (r->mult & (1U << 31) || factor & (1ULL << 63)) |
| 1020 | break; |
| 1021 | factor <<= 1; |
| 1022 | r->shift++; |
| 1023 | } |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 1024 | } |
| 1025 | } |
| 1026 | EXPORT_SYMBOL(psched_ratecfg_precompute); |