Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * net/sched/sch_htb.c Hierarchical token bucket, feed tree version |
| 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: Martin Devera, <devik@cdi.cz> |
| 10 | * |
| 11 | * Credits (in time order) for older HTB versions: |
| 12 | * Stef Coene <stef.coene@docum.org> |
| 13 | * HTB support at LARTC mailing list |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 14 | * Ondrej Kraus, <krauso@barr.cz> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | * found missing INIT_QDISC(htb) |
| 16 | * Vladimir Smelhaus, Aamer Akhter, Bert Hubert |
| 17 | * helped a lot to locate nasty class stall bug |
| 18 | * Andi Kleen, Jamal Hadi, Bert Hubert |
| 19 | * code review and helpful comments on shaping |
| 20 | * Tomasz Wrona, <tw@eter.tym.pl> |
| 21 | * created test case so that I was able to fix nasty bug |
| 22 | * Wilfried Weissmann |
| 23 | * spotted bug in dequeue code and helped with fix |
| 24 | * Jiri Fojtasek |
| 25 | * fixed requeue routine |
| 26 | * and many others. thanks. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/module.h> |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 29 | #include <linux/moduleparam.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/types.h> |
| 31 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/skbuff.h> |
| 35 | #include <linux/list.h> |
| 36 | #include <linux/compiler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/rbtree.h> |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 38 | #include <linux/workqueue.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 39 | #include <linux/slab.h> |
Patrick McHardy | 0ba4805 | 2007-07-02 22:49:07 -0700 | [diff] [blame] | 40 | #include <net/netlink.h> |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 41 | #include <net/sch_generic.h> |
Patrick McHardy | 0ba4805 | 2007-07-02 22:49:07 -0700 | [diff] [blame] | 42 | #include <net/pkt_sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | /* HTB algorithm. |
| 45 | Author: devik@cdi.cz |
| 46 | ======================================================================== |
| 47 | HTB is like TBF with multiple classes. It is also similar to CBQ because |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 48 | it allows to assign priority to each class in hierarchy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | In fact it is another implementation of Floyd's formal sharing. |
| 50 | |
| 51 | Levels: |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 52 | Each class is assigned level. Leaf has ALWAYS level 0 and root |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | classes have level TC_HTB_MAXDEPTH-1. Interior nodes has level |
| 54 | one less than their parent. |
| 55 | */ |
| 56 | |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 57 | static int htb_hysteresis __read_mostly = 0; /* whether to use mode hysteresis for speedup */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 58 | #define HTB_VER 0x30011 /* major must be matched with number suplied by TC as version */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #if HTB_VER >> 16 != TC_HTB_PROTOVER |
| 61 | #error "Mismatched sch_htb.c and pkt_sch.h" |
| 62 | #endif |
| 63 | |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 64 | /* Module parameter and sysfs export */ |
| 65 | module_param (htb_hysteresis, int, 0640); |
| 66 | MODULE_PARM_DESC(htb_hysteresis, "Hysteresis mode, less CPU load, less accurate"); |
| 67 | |
Eric Dumazet | 64153ce | 2013-06-06 14:53:16 -0700 | [diff] [blame] | 68 | static int htb_rate_est = 0; /* htb classes have a default rate estimator */ |
| 69 | module_param(htb_rate_est, int, 0640); |
| 70 | MODULE_PARM_DESC(htb_rate_est, "setup a default rate estimator (4sec 16sec) for htb classes"); |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | /* used internaly to keep status of single class */ |
| 73 | enum htb_cmode { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 74 | HTB_CANT_SEND, /* class can't send and can't borrow */ |
| 75 | HTB_MAY_BORROW, /* class can't send but may borrow */ |
| 76 | HTB_CAN_SEND /* class can send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | }; |
| 78 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 79 | struct htb_prio { |
| 80 | union { |
| 81 | struct rb_root row; |
| 82 | struct rb_root feed; |
| 83 | }; |
| 84 | struct rb_node *ptr; |
| 85 | /* When class changes from state 1->2 and disconnects from |
| 86 | * parent's feed then we lost ptr value and start from the |
| 87 | * first child again. Here we store classid of the |
| 88 | * last valid ptr (used when ptr is NULL). |
| 89 | */ |
| 90 | u32 last_ptr_id; |
| 91 | }; |
| 92 | |
Eric Dumazet | ca4ec90 | 2013-06-13 07:58:30 -0700 | [diff] [blame] | 93 | /* interior & leaf nodes; props specific to leaves are marked L: |
| 94 | * To reduce false sharing, place mostly read fields at beginning, |
| 95 | * and mostly written ones at the end. |
| 96 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 97 | struct htb_class { |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 98 | struct Qdisc_class_common common; |
Eric Dumazet | ca4ec90 | 2013-06-13 07:58:30 -0700 | [diff] [blame] | 99 | struct psched_ratecfg rate; |
| 100 | struct psched_ratecfg ceil; |
| 101 | s64 buffer, cbuffer;/* token bucket depth/rate */ |
| 102 | s64 mbuffer; /* max wait time */ |
stephen hemminger | cbd3755 | 2013-08-01 22:32:07 -0700 | [diff] [blame] | 103 | u32 prio; /* these two are used only by leaves... */ |
Eric Dumazet | ca4ec90 | 2013-06-13 07:58:30 -0700 | [diff] [blame] | 104 | int quantum; /* but stored for parent-to-leaf return */ |
| 105 | |
| 106 | struct tcf_proto *filter_list; /* class attached filters */ |
| 107 | int filter_cnt; |
| 108 | int refcnt; /* usage count of this class */ |
| 109 | |
| 110 | int level; /* our level (see above) */ |
| 111 | unsigned int children; |
| 112 | struct htb_class *parent; /* parent class */ |
| 113 | |
Eric Dumazet | 45203a3 | 2013-06-06 08:43:22 -0700 | [diff] [blame] | 114 | struct gnet_stats_rate_est64 rate_est; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Eric Dumazet | ca4ec90 | 2013-06-13 07:58:30 -0700 | [diff] [blame] | 116 | /* |
| 117 | * Written often fields |
| 118 | */ |
| 119 | struct gnet_stats_basic_packed bstats; |
| 120 | struct gnet_stats_queue qstats; |
| 121 | struct tc_htb_xstats xstats; /* our special stats */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
Eric Dumazet | ca4ec90 | 2013-06-13 07:58:30 -0700 | [diff] [blame] | 123 | /* token bucket parameters */ |
| 124 | s64 tokens, ctokens;/* current number of tokens */ |
| 125 | s64 t_c; /* checkpoint time */ |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 126 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 127 | union { |
| 128 | struct htb_class_leaf { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 129 | struct list_head drop_list; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 130 | int deficit[TC_HTB_MAXDEPTH]; |
| 131 | struct Qdisc *q; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 132 | } leaf; |
| 133 | struct htb_class_inner { |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 134 | struct htb_prio clprio[TC_HTB_NUMPRIO]; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 135 | } inner; |
| 136 | } un; |
Eric Dumazet | ca4ec90 | 2013-06-13 07:58:30 -0700 | [diff] [blame] | 137 | s64 pq_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
Eric Dumazet | ca4ec90 | 2013-06-13 07:58:30 -0700 | [diff] [blame] | 139 | int prio_activity; /* for which prios are we active */ |
| 140 | enum htb_cmode cmode; /* current mode of the class */ |
| 141 | struct rb_node pq_node; /* node for event queue */ |
| 142 | struct rb_node node[TC_HTB_NUMPRIO]; /* node for self or feed tree */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | }; |
| 144 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 145 | struct htb_level { |
| 146 | struct rb_root wait_pq; |
| 147 | struct htb_prio hprio[TC_HTB_NUMPRIO]; |
| 148 | }; |
| 149 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 150 | struct htb_sched { |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 151 | struct Qdisc_class_hash clhash; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 152 | int defcls; /* class where unclassified flows go to */ |
| 153 | int rate2quantum; /* quant = rate / rate2quantum */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 155 | /* filters for qdisc itself */ |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 156 | struct tcf_proto *filter_list; |
Jarek Poplawski | e82181d | 2009-02-01 01:13:05 -0800 | [diff] [blame] | 157 | |
| 158 | #define HTB_WARN_TOOMANYEVENTS 0x1 |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 159 | unsigned int warned; /* only one warning */ |
| 160 | int direct_qlen; |
| 161 | struct work_struct work; |
| 162 | |
| 163 | /* non shaped skbs; let them go directly thru */ |
| 164 | struct sk_buff_head direct_queue; |
| 165 | long direct_pkts; |
| 166 | |
| 167 | struct qdisc_watchdog watchdog; |
| 168 | |
| 169 | s64 now; /* cached dequeue time */ |
| 170 | struct list_head drops[TC_HTB_NUMPRIO];/* active leaves (for drops) */ |
| 171 | |
| 172 | /* time of nearest event per level (row) */ |
| 173 | s64 near_ev_cache[TC_HTB_MAXDEPTH]; |
| 174 | |
| 175 | int row_mask[TC_HTB_MAXDEPTH]; |
| 176 | |
| 177 | struct htb_level hlevel[TC_HTB_MAXDEPTH]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | }; |
| 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | /* find class in global hash table using given handle */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 181 | static inline struct htb_class *htb_find(u32 handle, struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | { |
| 183 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 184 | struct Qdisc_class_common *clc; |
Stephen Hemminger | 0cef296 | 2006-08-10 23:35:38 -0700 | [diff] [blame] | 185 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 186 | clc = qdisc_class_find(&q->clhash, handle); |
| 187 | if (clc == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | return NULL; |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 189 | return container_of(clc, struct htb_class, common); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | /** |
| 193 | * htb_classify - classify a packet into class |
| 194 | * |
| 195 | * It returns NULL if the packet should be dropped or -1 if the packet |
| 196 | * should be passed directly thru. In all other cases leaf class is returned. |
| 197 | * We allow direct class selection by classid in priority. The we examine |
| 198 | * filters in qdisc and in inner nodes (if higher filter points to the inner |
| 199 | * node). If we end up with classid MAJOR:0 we enqueue the skb into special |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 200 | * internal fifo (direct). These packets then go directly thru. If we still |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 201 | * have no valid leaf we try to use MAJOR:default leaf. It still unsuccessful |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | * then finish and return direct queue. |
| 203 | */ |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 204 | #define HTB_DIRECT ((struct htb_class *)-1L) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 206 | static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch, |
| 207 | int *qerr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
| 209 | struct htb_sched *q = qdisc_priv(sch); |
| 210 | struct htb_class *cl; |
| 211 | struct tcf_result res; |
| 212 | struct tcf_proto *tcf; |
| 213 | int result; |
| 214 | |
| 215 | /* allow to select class by setting skb->priority to valid classid; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 216 | * note that nfmark can be used too by attaching filter fw with no |
| 217 | * rules in it |
| 218 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | if (skb->priority == sch->handle) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 220 | return HTB_DIRECT; /* X:0 (direct flow) selected */ |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 221 | cl = htb_find(skb->priority, sch); |
Harry Mason | 2982431 | 2014-01-17 13:22:32 +0000 | [diff] [blame] | 222 | if (cl) { |
| 223 | if (cl->level == 0) |
| 224 | return cl; |
| 225 | /* Start with inner filter chain if a non-leaf class is selected */ |
| 226 | tcf = cl->filter_list; |
| 227 | } else { |
| 228 | tcf = q->filter_list; |
| 229 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Jarek Poplawski | c27f339 | 2008-08-04 22:39:11 -0700 | [diff] [blame] | 231 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) { |
| 233 | #ifdef CONFIG_NET_CLS_ACT |
| 234 | switch (result) { |
| 235 | case TC_ACT_QUEUED: |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 236 | case TC_ACT_STOLEN: |
Jarek Poplawski | 378a2f0 | 2008-08-04 22:31:03 -0700 | [diff] [blame] | 237 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | case TC_ACT_SHOT: |
| 239 | return NULL; |
| 240 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | #endif |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 242 | cl = (void *)res.class; |
| 243 | if (!cl) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | if (res.classid == sch->handle) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 245 | return HTB_DIRECT; /* X:0 (direct flow) */ |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 246 | cl = htb_find(res.classid, sch); |
| 247 | if (!cl) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 248 | break; /* filter selected invalid classid */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | } |
| 250 | if (!cl->level) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 251 | return cl; /* we hit leaf; return it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
| 253 | /* we have got inner class; apply inner filter chain */ |
| 254 | tcf = cl->filter_list; |
| 255 | } |
| 256 | /* classification failed; try to use default class */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 257 | cl = htb_find(TC_H_MAKE(TC_H_MAJ(sch->handle), q->defcls), sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (!cl || cl->level) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 259 | return HTB_DIRECT; /* bad default .. this is safe bet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | return cl; |
| 261 | } |
| 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | /** |
| 264 | * htb_add_to_id_tree - adds class to the round robin list |
| 265 | * |
| 266 | * Routine adds class to the list (actually tree) sorted by classid. |
| 267 | * Make sure that class is not already on such list for given prio. |
| 268 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 269 | static void htb_add_to_id_tree(struct rb_root *root, |
| 270 | struct htb_class *cl, int prio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
| 272 | struct rb_node **p = &root->rb_node, *parent = NULL; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | while (*p) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 275 | struct htb_class *c; |
| 276 | parent = *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | c = rb_entry(parent, struct htb_class, node[prio]); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 278 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 279 | if (cl->common.classid > c->common.classid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | p = &parent->rb_right; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 281 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | p = &parent->rb_left; |
| 283 | } |
| 284 | rb_link_node(&cl->node[prio], parent, p); |
| 285 | rb_insert_color(&cl->node[prio], root); |
| 286 | } |
| 287 | |
| 288 | /** |
| 289 | * htb_add_to_wait_tree - adds class to the event queue with delay |
| 290 | * |
| 291 | * The class is added to priority event queue to indicate that class will |
| 292 | * change its mode in cl->pq_key microseconds. Make sure that class is not |
| 293 | * already in the queue. |
| 294 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 295 | static void htb_add_to_wait_tree(struct htb_sched *q, |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 296 | struct htb_class *cl, s64 delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 298 | struct rb_node **p = &q->hlevel[cl->level].wait_pq.rb_node, *parent = NULL; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 299 | |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 300 | cl->pq_key = q->now + delay; |
| 301 | if (cl->pq_key == q->now) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | cl->pq_key++; |
| 303 | |
| 304 | /* update the nearest event cache */ |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 305 | if (q->near_ev_cache[cl->level] > cl->pq_key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | q->near_ev_cache[cl->level] = cl->pq_key; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | while (*p) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 309 | struct htb_class *c; |
| 310 | parent = *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | c = rb_entry(parent, struct htb_class, pq_node); |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 312 | if (cl->pq_key >= c->pq_key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | p = &parent->rb_right; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 314 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | p = &parent->rb_left; |
| 316 | } |
| 317 | rb_link_node(&cl->pq_node, parent, p); |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 318 | rb_insert_color(&cl->pq_node, &q->hlevel[cl->level].wait_pq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | /** |
| 322 | * htb_next_rb_node - finds next node in binary tree |
| 323 | * |
| 324 | * When we are past last key we return NULL. |
| 325 | * Average complexity is 2 steps per call. |
| 326 | */ |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 327 | static inline void htb_next_rb_node(struct rb_node **n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
| 329 | *n = rb_next(*n); |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * htb_add_class_to_row - add class to its row |
| 334 | * |
| 335 | * The class is added to row at priorities marked in mask. |
| 336 | * It does nothing if mask == 0. |
| 337 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 338 | static inline void htb_add_class_to_row(struct htb_sched *q, |
| 339 | struct htb_class *cl, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | q->row_mask[cl->level] |= mask; |
| 342 | while (mask) { |
| 343 | int prio = ffz(~mask); |
| 344 | mask &= ~(1 << prio); |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 345 | htb_add_to_id_tree(&q->hlevel[cl->level].hprio[prio].row, cl, prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
| 347 | } |
| 348 | |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 349 | /* If this triggers, it is a bug in this code, but it need not be fatal */ |
| 350 | static void htb_safe_rb_erase(struct rb_node *rb, struct rb_root *root) |
| 351 | { |
Ismail Donmez | 81771b3 | 2006-10-03 13:49:10 -0700 | [diff] [blame] | 352 | if (RB_EMPTY_NODE(rb)) { |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 353 | WARN_ON(1); |
| 354 | } else { |
| 355 | rb_erase(rb, root); |
| 356 | RB_CLEAR_NODE(rb); |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | /** |
| 362 | * htb_remove_class_from_row - removes class from its row |
| 363 | * |
| 364 | * The class is removed from row at priorities marked in mask. |
| 365 | * It does nothing if mask == 0. |
| 366 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 367 | static inline void htb_remove_class_from_row(struct htb_sched *q, |
| 368 | struct htb_class *cl, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
| 370 | int m = 0; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 371 | struct htb_level *hlevel = &q->hlevel[cl->level]; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | while (mask) { |
| 374 | int prio = ffz(~mask); |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 375 | struct htb_prio *hprio = &hlevel->hprio[prio]; |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | mask &= ~(1 << prio); |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 378 | if (hprio->ptr == cl->node + prio) |
| 379 | htb_next_rb_node(&hprio->ptr); |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 380 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 381 | htb_safe_rb_erase(cl->node + prio, &hprio->row); |
| 382 | if (!hprio->row.rb_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | m |= 1 << prio; |
| 384 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | q->row_mask[cl->level] &= ~m; |
| 386 | } |
| 387 | |
| 388 | /** |
| 389 | * htb_activate_prios - creates active classe's feed chain |
| 390 | * |
| 391 | * The class is connected to ancestors and/or appropriate rows |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 392 | * for priorities it is participating on. cl->cmode must be new |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | * (activated) mode. It does nothing if cl->prio_activity == 0. |
| 394 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 395 | static void htb_activate_prios(struct htb_sched *q, struct htb_class *cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | { |
| 397 | struct htb_class *p = cl->parent; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 398 | long m, mask = cl->prio_activity; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
| 400 | while (cl->cmode == HTB_MAY_BORROW && p && mask) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 401 | m = mask; |
| 402 | while (m) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | int prio = ffz(~m); |
| 404 | m &= ~(1 << prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 405 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 406 | if (p->un.inner.clprio[prio].feed.rb_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | /* parent already has its feed in use so that |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 408 | * reset bit in mask as parent is already ok |
| 409 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | mask &= ~(1 << prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 411 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 412 | htb_add_to_id_tree(&p->un.inner.clprio[prio].feed, cl, prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | p->prio_activity |= mask; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 415 | cl = p; |
| 416 | p = cl->parent; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
| 419 | if (cl->cmode == HTB_CAN_SEND && mask) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 420 | htb_add_class_to_row(q, cl, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | /** |
| 424 | * htb_deactivate_prios - remove class from feed chain |
| 425 | * |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 426 | * cl->cmode must represent old mode (before deactivation). It does |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | * nothing if cl->prio_activity == 0. Class is removed from all feed |
| 428 | * chains and rows. |
| 429 | */ |
| 430 | static void htb_deactivate_prios(struct htb_sched *q, struct htb_class *cl) |
| 431 | { |
| 432 | struct htb_class *p = cl->parent; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 433 | long m, mask = cl->prio_activity; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
| 435 | while (cl->cmode == HTB_MAY_BORROW && p && mask) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 436 | m = mask; |
| 437 | mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | while (m) { |
| 439 | int prio = ffz(~m); |
| 440 | m &= ~(1 << prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 441 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 442 | if (p->un.inner.clprio[prio].ptr == cl->node + prio) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* we are removing child which is pointed to from |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 444 | * parent feed - forget the pointer but remember |
| 445 | * classid |
| 446 | */ |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 447 | p->un.inner.clprio[prio].last_ptr_id = cl->common.classid; |
| 448 | p->un.inner.clprio[prio].ptr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 450 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 451 | htb_safe_rb_erase(cl->node + prio, |
| 452 | &p->un.inner.clprio[prio].feed); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 453 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 454 | if (!p->un.inner.clprio[prio].feed.rb_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | mask |= 1 << prio; |
| 456 | } |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | p->prio_activity &= ~mask; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 459 | cl = p; |
| 460 | p = cl->parent; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 463 | if (cl->cmode == HTB_CAN_SEND && mask) |
| 464 | htb_remove_class_from_row(q, cl, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | } |
| 466 | |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 467 | static inline s64 htb_lowater(const struct htb_class *cl) |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 468 | { |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 469 | if (htb_hysteresis) |
| 470 | return cl->cmode != HTB_CANT_SEND ? -cl->cbuffer : 0; |
| 471 | else |
| 472 | return 0; |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 473 | } |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 474 | static inline s64 htb_hiwater(const struct htb_class *cl) |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 475 | { |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 476 | if (htb_hysteresis) |
| 477 | return cl->cmode == HTB_CAN_SEND ? -cl->buffer : 0; |
| 478 | else |
| 479 | return 0; |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 480 | } |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 481 | |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | /** |
| 484 | * htb_class_mode - computes and returns current class mode |
| 485 | * |
| 486 | * It computes cl's mode at time cl->t_c+diff and returns it. If mode |
| 487 | * is not HTB_CAN_SEND then cl->pq_key is updated to time difference |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 488 | * from now to time when cl will change its state. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | * Also it is worth to note that class mode doesn't change simply |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 490 | * at cl->{c,}tokens == 0 but there can rather be hysteresis of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | * 0 .. -cl->{c,}buffer range. It is meant to limit number of |
| 492 | * mode transitions per time unit. The speed gain is about 1/6. |
| 493 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 494 | static inline enum htb_cmode |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 495 | htb_class_mode(struct htb_class *cl, s64 *diff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | { |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 497 | s64 toks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 499 | if ((toks = (cl->ctokens + *diff)) < htb_lowater(cl)) { |
| 500 | *diff = -toks; |
| 501 | return HTB_CANT_SEND; |
| 502 | } |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 503 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 504 | if ((toks = (cl->tokens + *diff)) >= htb_hiwater(cl)) |
| 505 | return HTB_CAN_SEND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 507 | *diff = -toks; |
| 508 | return HTB_MAY_BORROW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
| 510 | |
| 511 | /** |
| 512 | * htb_change_class_mode - changes classe's mode |
| 513 | * |
| 514 | * This should be the only way how to change classe's mode under normal |
| 515 | * cirsumstances. Routine will update feed lists linkage, change mode |
| 516 | * and add class to the wait event queue if appropriate. New mode should |
| 517 | * be different from old one and cl->pq_key has to be valid if changing |
| 518 | * to mode other than HTB_CAN_SEND (see htb_add_to_wait_tree). |
| 519 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 520 | static void |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 521 | htb_change_class_mode(struct htb_sched *q, struct htb_class *cl, s64 *diff) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 522 | { |
| 523 | enum htb_cmode new_mode = htb_class_mode(cl, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
| 525 | if (new_mode == cl->cmode) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 526 | return; |
| 527 | |
| 528 | if (cl->prio_activity) { /* not necessary: speed optimization */ |
| 529 | if (cl->cmode != HTB_CANT_SEND) |
| 530 | htb_deactivate_prios(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | cl->cmode = new_mode; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 532 | if (new_mode != HTB_CANT_SEND) |
| 533 | htb_activate_prios(q, cl); |
| 534 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | cl->cmode = new_mode; |
| 536 | } |
| 537 | |
| 538 | /** |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 539 | * htb_activate - inserts leaf cl into appropriate active feeds |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | * |
| 541 | * Routine learns (new) priority of leaf and activates feed chain |
| 542 | * for the prio. It can be called on already active leaf safely. |
| 543 | * It also adds leaf into droplist. |
| 544 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 545 | static inline void htb_activate(struct htb_sched *q, struct htb_class *cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 547 | WARN_ON(cl->level || !cl->un.leaf.q || !cl->un.leaf.q->q.qlen); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | if (!cl->prio_activity) { |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 550 | cl->prio_activity = 1 << cl->prio; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 551 | htb_activate_prios(q, cl); |
| 552 | list_add_tail(&cl->un.leaf.drop_list, |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 553 | q->drops + cl->prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
| 555 | } |
| 556 | |
| 557 | /** |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 558 | * htb_deactivate - remove leaf cl from active feeds |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | * |
| 560 | * Make sure that leaf is active. In the other words it can't be called |
| 561 | * with non-active leaf. It also removes class from the drop list. |
| 562 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 563 | static inline void htb_deactivate(struct htb_sched *q, struct htb_class *cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 565 | WARN_ON(!cl->prio_activity); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 566 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 567 | htb_deactivate_prios(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | cl->prio_activity = 0; |
| 569 | list_del_init(&cl->un.leaf.drop_list); |
| 570 | } |
| 571 | |
| 572 | static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
| 573 | { |
Jarek Poplawski | f30ab41 | 2008-11-13 22:56:30 -0800 | [diff] [blame] | 574 | int uninitialized_var(ret); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 575 | struct htb_sched *q = qdisc_priv(sch); |
| 576 | struct htb_class *cl = htb_classify(skb, sch, &ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 578 | if (cl == HTB_DIRECT) { |
| 579 | /* enqueue to helper queue */ |
| 580 | if (q->direct_queue.qlen < q->direct_qlen) { |
| 581 | __skb_queue_tail(&q->direct_queue, skb); |
| 582 | q->direct_pkts++; |
| 583 | } else { |
Eric Dumazet | 1704575 | 2012-05-04 04:37:21 +0000 | [diff] [blame] | 584 | return qdisc_drop(skb, sch); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 585 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | #ifdef CONFIG_NET_CLS_ACT |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 587 | } else if (!cl) { |
Jarek Poplawski | c27f339 | 2008-08-04 22:39:11 -0700 | [diff] [blame] | 588 | if (ret & __NET_XMIT_BYPASS) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 589 | sch->qstats.drops++; |
| 590 | kfree_skb(skb); |
| 591 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | #endif |
Jarek Poplawski | 378a2f0 | 2008-08-04 22:31:03 -0700 | [diff] [blame] | 593 | } else if ((ret = qdisc_enqueue(skb, cl->un.leaf.q)) != NET_XMIT_SUCCESS) { |
| 594 | if (net_xmit_drop_count(ret)) { |
| 595 | sch->qstats.drops++; |
| 596 | cl->qstats.drops++; |
| 597 | } |
David S. Miller | 6974765 | 2008-08-17 23:55:36 -0700 | [diff] [blame] | 598 | return ret; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 599 | } else { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 600 | htb_activate(q, cl); |
| 601 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 603 | sch->q.qlen++; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 604 | return NET_XMIT_SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 607 | static inline void htb_accnt_tokens(struct htb_class *cl, int bytes, s64 diff) |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 608 | { |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 609 | s64 toks = diff + cl->tokens; |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 610 | |
| 611 | if (toks > cl->buffer) |
| 612 | toks = cl->buffer; |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 613 | toks -= (s64) psched_l2t_ns(&cl->rate, bytes); |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 614 | if (toks <= -cl->mbuffer) |
| 615 | toks = 1 - cl->mbuffer; |
| 616 | |
| 617 | cl->tokens = toks; |
| 618 | } |
| 619 | |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 620 | static inline void htb_accnt_ctokens(struct htb_class *cl, int bytes, s64 diff) |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 621 | { |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 622 | s64 toks = diff + cl->ctokens; |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 623 | |
| 624 | if (toks > cl->cbuffer) |
| 625 | toks = cl->cbuffer; |
Jiri Pirko | 292f1c7 | 2013-02-12 00:12:03 +0000 | [diff] [blame] | 626 | toks -= (s64) psched_l2t_ns(&cl->ceil, bytes); |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 627 | if (toks <= -cl->mbuffer) |
| 628 | toks = 1 - cl->mbuffer; |
| 629 | |
| 630 | cl->ctokens = toks; |
| 631 | } |
| 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | /** |
| 634 | * htb_charge_class - charges amount "bytes" to leaf and ancestors |
| 635 | * |
| 636 | * Routine assumes that packet "bytes" long was dequeued from leaf cl |
| 637 | * borrowing from "level". It accounts bytes to ceil leaky bucket for |
| 638 | * leaf and all ancestors and to rate bucket for ancestors at levels |
| 639 | * "level" and higher. It also handles possible change of mode resulting |
| 640 | * from the update. Note that mode can also increase here (MAY_BORROW to |
| 641 | * CAN_SEND) because we can use more precise clock that event queue here. |
| 642 | * In such case we remove class from event queue first. |
| 643 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 644 | static void htb_charge_class(struct htb_sched *q, struct htb_class *cl, |
Ranjit Manomohan | c9726d6 | 2007-07-10 22:43:16 -0700 | [diff] [blame] | 645 | int level, struct sk_buff *skb) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 646 | { |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 647 | int bytes = qdisc_pkt_len(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | enum htb_cmode old_mode; |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 649 | s64 diff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
| 651 | while (cl) { |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 652 | diff = min_t(s64, q->now - cl->t_c, cl->mbuffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | if (cl->level >= level) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 654 | if (cl->level == level) |
| 655 | cl->xstats.lends++; |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 656 | htb_accnt_tokens(cl, bytes, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } else { |
| 658 | cl->xstats.borrows++; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 659 | cl->tokens += diff; /* we moved t_c; update tokens */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | } |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 661 | htb_accnt_ctokens(cl, bytes, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | cl->t_c = q->now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 664 | old_mode = cl->cmode; |
| 665 | diff = 0; |
| 666 | htb_change_class_mode(q, cl, &diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | if (old_mode != cl->cmode) { |
| 668 | if (old_mode != HTB_CAN_SEND) |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 669 | htb_safe_rb_erase(&cl->pq_node, &q->hlevel[cl->level].wait_pq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | if (cl->cmode != HTB_CAN_SEND) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 671 | htb_add_to_wait_tree(q, cl, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
Eric Dumazet | bfe0d02 | 2011-01-09 08:30:54 +0000 | [diff] [blame] | 674 | /* update basic stats except for leaves which are already updated */ |
| 675 | if (cl->level) |
| 676 | bstats_update(&cl->bstats, skb); |
| 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | cl = cl->parent; |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | /** |
| 683 | * htb_do_events - make mode changes to classes at the level |
| 684 | * |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 685 | * Scans event queue for pending events and applies them. Returns time of |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 686 | * next pending event (0 for no event in pq, q->now for too many events). |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 687 | * Note: Applied are events whose have cl->pq_key <= q->now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | */ |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 689 | static s64 htb_do_events(struct htb_sched *q, const int level, |
Eric Dumazet | 5343a7f | 2013-06-04 07:11:48 +0000 | [diff] [blame] | 690 | unsigned long start) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | { |
Martin Devera | 8f3ea33 | 2008-03-23 22:00:38 -0700 | [diff] [blame] | 692 | /* don't run for longer than 2 jiffies; 2 is used instead of |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 693 | * 1 to simplify things when jiffy is going to be incremented |
| 694 | * too soon |
| 695 | */ |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 696 | unsigned long stop_at = start + 2; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 697 | struct rb_root *wait_pq = &q->hlevel[level].wait_pq; |
| 698 | |
Martin Devera | 8f3ea33 | 2008-03-23 22:00:38 -0700 | [diff] [blame] | 699 | while (time_before(jiffies, stop_at)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | struct htb_class *cl; |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 701 | s64 diff; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 702 | struct rb_node *p = rb_first(wait_pq); |
Akinbou Mita | 30bdbe3 | 2006-10-12 01:52:05 -0700 | [diff] [blame] | 703 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 704 | if (!p) |
| 705 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
| 707 | cl = rb_entry(p, struct htb_class, pq_node); |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 708 | if (cl->pq_key > q->now) |
| 709 | return cl->pq_key; |
| 710 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 711 | htb_safe_rb_erase(p, wait_pq); |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 712 | diff = min_t(s64, q->now - cl->t_c, cl->mbuffer); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 713 | htb_change_class_mode(q, cl, &diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | if (cl->cmode != HTB_CAN_SEND) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 715 | htb_add_to_wait_tree(q, cl, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | } |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 717 | |
| 718 | /* too much load - let's continue after a break for scheduling */ |
Jarek Poplawski | e82181d | 2009-02-01 01:13:05 -0800 | [diff] [blame] | 719 | if (!(q->warned & HTB_WARN_TOOMANYEVENTS)) { |
Yang Yingliang | c17988a | 2013-12-23 17:38:58 +0800 | [diff] [blame] | 720 | pr_warn("htb: too many events!\n"); |
Jarek Poplawski | e82181d | 2009-02-01 01:13:05 -0800 | [diff] [blame] | 721 | q->warned |= HTB_WARN_TOOMANYEVENTS; |
| 722 | } |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 723 | |
| 724 | return q->now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | /* Returns class->node+prio from id-tree where classe's id is >= id. NULL |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 728 | * is no such one exists. |
| 729 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 730 | static struct rb_node *htb_id_find_next_upper(int prio, struct rb_node *n, |
| 731 | u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
| 733 | struct rb_node *r = NULL; |
| 734 | while (n) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 735 | struct htb_class *cl = |
| 736 | rb_entry(n, struct htb_class, node[prio]); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 737 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 738 | if (id > cl->common.classid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | n = n->rb_right; |
Jarek Poplawski | 1b5c007 | 2008-12-09 22:34:40 -0800 | [diff] [blame] | 740 | } else if (id < cl->common.classid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | r = n; |
| 742 | n = n->rb_left; |
Jarek Poplawski | 1b5c007 | 2008-12-09 22:34:40 -0800 | [diff] [blame] | 743 | } else { |
| 744 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | } |
| 746 | } |
| 747 | return r; |
| 748 | } |
| 749 | |
| 750 | /** |
| 751 | * htb_lookup_leaf - returns next leaf class in DRR order |
| 752 | * |
| 753 | * Find leaf where current feed pointers points to. |
| 754 | */ |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 755 | static struct htb_class *htb_lookup_leaf(struct htb_prio *hprio, const int prio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | { |
| 757 | int i; |
| 758 | struct { |
| 759 | struct rb_node *root; |
| 760 | struct rb_node **pptr; |
| 761 | u32 *pid; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 762 | } stk[TC_HTB_MAXDEPTH], *sp = stk; |
| 763 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 764 | BUG_ON(!hprio->row.rb_node); |
| 765 | sp->root = hprio->row.rb_node; |
| 766 | sp->pptr = &hprio->ptr; |
| 767 | sp->pid = &hprio->last_ptr_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | for (i = 0; i < 65535; i++) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 770 | if (!*sp->pptr && *sp->pid) { |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 771 | /* ptr was invalidated but id is valid - try to recover |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 772 | * the original or next ptr |
| 773 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 774 | *sp->pptr = |
| 775 | htb_id_find_next_upper(prio, sp->root, *sp->pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 777 | *sp->pid = 0; /* ptr is valid now so that remove this hint as it |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 778 | * can become out of date quickly |
| 779 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 780 | if (!*sp->pptr) { /* we are at right end; rewind & go up */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | *sp->pptr = sp->root; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 782 | while ((*sp->pptr)->rb_left) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | *sp->pptr = (*sp->pptr)->rb_left; |
| 784 | if (sp > stk) { |
| 785 | sp--; |
Jarek Poplawski | 512bb43 | 2008-12-09 22:35:02 -0800 | [diff] [blame] | 786 | if (!*sp->pptr) { |
| 787 | WARN_ON(1); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 788 | return NULL; |
Jarek Poplawski | 512bb43 | 2008-12-09 22:35:02 -0800 | [diff] [blame] | 789 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 790 | htb_next_rb_node(sp->pptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | } |
| 792 | } else { |
| 793 | struct htb_class *cl; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 794 | struct htb_prio *clp; |
| 795 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 796 | cl = rb_entry(*sp->pptr, struct htb_class, node[prio]); |
| 797 | if (!cl->level) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | return cl; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 799 | clp = &cl->un.inner.clprio[prio]; |
| 800 | (++sp)->root = clp->feed.rb_node; |
| 801 | sp->pptr = &clp->ptr; |
| 802 | sp->pid = &clp->last_ptr_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | } |
| 804 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 805 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | return NULL; |
| 807 | } |
| 808 | |
| 809 | /* dequeues packet at given priority and level; call only if |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 810 | * you are sure that there is active class at prio/level |
| 811 | */ |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 812 | static struct sk_buff *htb_dequeue_tree(struct htb_sched *q, const int prio, |
| 813 | const int level) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | { |
| 815 | struct sk_buff *skb = NULL; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 816 | struct htb_class *cl, *start; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 817 | struct htb_level *hlevel = &q->hlevel[level]; |
| 818 | struct htb_prio *hprio = &hlevel->hprio[prio]; |
| 819 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | /* look initial class up in the row */ |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 821 | start = cl = htb_lookup_leaf(hprio, prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 822 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | do { |
| 824 | next: |
Jarek Poplawski | 512bb43 | 2008-12-09 22:35:02 -0800 | [diff] [blame] | 825 | if (unlikely(!cl)) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 826 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
| 828 | /* class can be empty - it is unlikely but can be true if leaf |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 829 | * qdisc drops packets in enqueue routine or if someone used |
| 830 | * graft operation on the leaf since last dequeue; |
| 831 | * simply deactivate and skip such class |
| 832 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | if (unlikely(cl->un.leaf.q->q.qlen == 0)) { |
| 834 | struct htb_class *next; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 835 | htb_deactivate(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
| 837 | /* row/level might become empty */ |
| 838 | if ((q->row_mask[level] & (1 << prio)) == 0) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 839 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 841 | next = htb_lookup_leaf(hprio, prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 842 | |
| 843 | if (cl == start) /* fix start if we just deleted it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | start = next; |
| 845 | cl = next; |
| 846 | goto next; |
| 847 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 848 | |
| 849 | skb = cl->un.leaf.q->dequeue(cl->un.leaf.q); |
| 850 | if (likely(skb != NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | break; |
Jarek Poplawski | 633fe66 | 2008-12-03 21:09:10 -0800 | [diff] [blame] | 852 | |
Jarek Poplawski | b00355d | 2009-02-01 01:12:42 -0800 | [diff] [blame] | 853 | qdisc_warn_nonwc("htb", cl->un.leaf.q); |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 854 | htb_next_rb_node(level ? &cl->parent->un.inner.clprio[prio].ptr: |
| 855 | &q->hlevel[0].hprio[prio].ptr); |
| 856 | cl = htb_lookup_leaf(hprio, prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | |
| 858 | } while (cl != start); |
| 859 | |
| 860 | if (likely(skb != NULL)) { |
Eric Dumazet | 196d97f | 2012-11-05 16:40:49 +0000 | [diff] [blame] | 861 | bstats_update(&cl->bstats, skb); |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 862 | cl->un.leaf.deficit[level] -= qdisc_pkt_len(skb); |
| 863 | if (cl->un.leaf.deficit[level] < 0) { |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 864 | cl->un.leaf.deficit[level] += cl->quantum; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 865 | htb_next_rb_node(level ? &cl->parent->un.inner.clprio[prio].ptr : |
| 866 | &q->hlevel[0].hprio[prio].ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | /* this used to be after charge_class but this constelation |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 869 | * gives us slightly better performance |
| 870 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | if (!cl->un.leaf.q->q.qlen) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 872 | htb_deactivate(q, cl); |
Ranjit Manomohan | c9726d6 | 2007-07-10 22:43:16 -0700 | [diff] [blame] | 873 | htb_charge_class(q, cl, level, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
| 875 | return skb; |
| 876 | } |
| 877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | static struct sk_buff *htb_dequeue(struct Qdisc *sch) |
| 879 | { |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 880 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | struct htb_sched *q = qdisc_priv(sch); |
| 882 | int level; |
Eric Dumazet | 5343a7f | 2013-06-04 07:11:48 +0000 | [diff] [blame] | 883 | s64 next_event; |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 884 | unsigned long start_at; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | /* try to dequeue direct packets as high prio (!) to minimize cpu work */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 887 | skb = __skb_dequeue(&q->direct_queue); |
| 888 | if (skb != NULL) { |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 889 | ok: |
| 890 | qdisc_bstats_update(sch, skb); |
Eric Dumazet | fd245a4 | 2011-01-20 05:27:16 +0000 | [diff] [blame] | 891 | qdisc_unthrottled(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | sch->q.qlen--; |
| 893 | return skb; |
| 894 | } |
| 895 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 896 | if (!sch->q.qlen) |
| 897 | goto fin; |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 898 | q->now = ktime_to_ns(ktime_get()); |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 899 | start_at = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
Stefan Hasko | d2fe85d | 2012-12-21 15:04:59 +0000 | [diff] [blame] | 901 | next_event = q->now + 5LLU * NSEC_PER_SEC; |
Jarek Poplawski | 633fe66 | 2008-12-03 21:09:10 -0800 | [diff] [blame] | 902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | for (level = 0; level < TC_HTB_MAXDEPTH; level++) { |
| 904 | /* common case optimization - skip event handler quickly */ |
| 905 | int m; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 906 | s64 event = q->near_ev_cache[level]; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 907 | |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 908 | if (q->now >= event) { |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 909 | event = htb_do_events(q, level, start_at); |
Patrick McHardy | 2e4b3b0 | 2007-05-23 23:39:54 -0700 | [diff] [blame] | 910 | if (!event) |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 911 | event = q->now + NSEC_PER_SEC; |
Patrick McHardy | 2e4b3b0 | 2007-05-23 23:39:54 -0700 | [diff] [blame] | 912 | q->near_ev_cache[level] = event; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 913 | } |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 914 | |
Jarek Poplawski | c085134 | 2009-01-12 21:54:16 -0800 | [diff] [blame] | 915 | if (next_event > event) |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 916 | next_event = event; |
| 917 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | m = ~q->row_mask[level]; |
| 919 | while (m != (int)(-1)) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 920 | int prio = ffz(m); |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | m |= 1 << prio; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 923 | skb = htb_dequeue_tree(q, prio, level); |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 924 | if (likely(skb != NULL)) |
| 925 | goto ok; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | } |
| 927 | } |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 928 | sch->qstats.overlimits++; |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 929 | if (likely(next_event > q->now)) { |
| 930 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
| 931 | &qdisc_root_sleeping(q->watchdog.qdisc)->state)) { |
| 932 | ktime_t time = ns_to_ktime(next_event); |
| 933 | qdisc_throttled(q->watchdog.qdisc); |
| 934 | hrtimer_start(&q->watchdog.timer, time, |
| 935 | HRTIMER_MODE_ABS); |
| 936 | } |
| 937 | } else { |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 938 | schedule_work(&q->work); |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 939 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | fin: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | return skb; |
| 942 | } |
| 943 | |
| 944 | /* try to drop from each class (by prio) until one succeed */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 945 | static unsigned int htb_drop(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | { |
| 947 | struct htb_sched *q = qdisc_priv(sch); |
| 948 | int prio; |
| 949 | |
| 950 | for (prio = TC_HTB_NUMPRIO - 1; prio >= 0; prio--) { |
| 951 | struct list_head *p; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 952 | list_for_each(p, q->drops + prio) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | struct htb_class *cl = list_entry(p, struct htb_class, |
| 954 | un.leaf.drop_list); |
| 955 | unsigned int len; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 956 | if (cl->un.leaf.q->ops->drop && |
| 957 | (len = cl->un.leaf.q->ops->drop(cl->un.leaf.q))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | sch->q.qlen--; |
| 959 | if (!cl->un.leaf.q->q.qlen) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 960 | htb_deactivate(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | return len; |
| 962 | } |
| 963 | } |
| 964 | } |
| 965 | return 0; |
| 966 | } |
| 967 | |
| 968 | /* reset all classes */ |
| 969 | /* always caled under BH & queue lock */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 970 | static void htb_reset(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | { |
| 972 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 973 | struct htb_class *cl; |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 974 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 976 | for (i = 0; i < q->clhash.hashsize; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 977 | hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | if (cl->level) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 979 | memset(&cl->un.inner, 0, sizeof(cl->un.inner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | else { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 981 | if (cl->un.leaf.q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | qdisc_reset(cl->un.leaf.q); |
| 983 | INIT_LIST_HEAD(&cl->un.leaf.drop_list); |
| 984 | } |
| 985 | cl->prio_activity = 0; |
| 986 | cl->cmode = HTB_CAN_SEND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
| 988 | } |
| 989 | } |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 990 | qdisc_watchdog_cancel(&q->watchdog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | __skb_queue_purge(&q->direct_queue); |
| 992 | sch->q.qlen = 0; |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 993 | memset(q->hlevel, 0, sizeof(q->hlevel)); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 994 | memset(q->row_mask, 0, sizeof(q->row_mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | for (i = 0; i < TC_HTB_NUMPRIO; i++) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 996 | INIT_LIST_HEAD(q->drops + i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | } |
| 998 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 999 | static const struct nla_policy htb_policy[TCA_HTB_MAX + 1] = { |
| 1000 | [TCA_HTB_PARMS] = { .len = sizeof(struct tc_htb_opt) }, |
| 1001 | [TCA_HTB_INIT] = { .len = sizeof(struct tc_htb_glob) }, |
| 1002 | [TCA_HTB_CTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, |
| 1003 | [TCA_HTB_RTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1004 | [TCA_HTB_DIRECT_QLEN] = { .type = NLA_U32 }, |
Eric Dumazet | df62cdf | 2013-09-19 09:10:20 -0700 | [diff] [blame] | 1005 | [TCA_HTB_RATE64] = { .type = NLA_U64 }, |
| 1006 | [TCA_HTB_CEIL64] = { .type = NLA_U64 }, |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 1007 | }; |
| 1008 | |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 1009 | static void htb_work_func(struct work_struct *work) |
| 1010 | { |
| 1011 | struct htb_sched *q = container_of(work, struct htb_sched, work); |
| 1012 | struct Qdisc *sch = q->watchdog.qdisc; |
| 1013 | |
| 1014 | __netif_schedule(qdisc_root(sch)); |
| 1015 | } |
| 1016 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1017 | static int htb_init(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | { |
| 1019 | struct htb_sched *q = qdisc_priv(sch); |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1020 | struct nlattr *tb[TCA_HTB_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | struct tc_htb_glob *gopt; |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 1022 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | int i; |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 1024 | |
| 1025 | if (!opt) |
| 1026 | return -EINVAL; |
| 1027 | |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1028 | err = nla_parse_nested(tb, TCA_HTB_MAX, opt, htb_policy); |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 1029 | if (err < 0) |
| 1030 | return err; |
| 1031 | |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1032 | if (!tb[TCA_HTB_INIT]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | return -EINVAL; |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1034 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1035 | gopt = nla_data(tb[TCA_HTB_INIT]); |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1036 | if (gopt->version != HTB_VER >> 16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1039 | err = qdisc_class_hash_init(&q->clhash); |
| 1040 | if (err < 0) |
| 1041 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | for (i = 0; i < TC_HTB_NUMPRIO; i++) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1043 | INIT_LIST_HEAD(q->drops + i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 1045 | qdisc_watchdog_init(&q->watchdog, sch); |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 1046 | INIT_WORK(&q->work, htb_work_func); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | skb_queue_head_init(&q->direct_queue); |
| 1048 | |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1049 | if (tb[TCA_HTB_DIRECT_QLEN]) |
| 1050 | q->direct_qlen = nla_get_u32(tb[TCA_HTB_DIRECT_QLEN]); |
| 1051 | else { |
| 1052 | q->direct_qlen = qdisc_dev(sch)->tx_queue_len; |
| 1053 | if (q->direct_qlen < 2) /* some devices have zero tx_queue_len */ |
| 1054 | q->direct_qlen = 2; |
| 1055 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | if ((q->rate2quantum = gopt->rate2quantum) < 1) |
| 1057 | q->rate2quantum = 1; |
| 1058 | q->defcls = gopt->defcls; |
| 1059 | |
| 1060 | return 0; |
| 1061 | } |
| 1062 | |
| 1063 | static int htb_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 1064 | { |
| 1065 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1066 | struct nlattr *nest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | struct tc_htb_glob gopt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | |
Eric Dumazet | 6f542ef | 2014-03-05 10:14:34 -0800 | [diff] [blame] | 1069 | /* Its safe to not acquire qdisc lock. As we hold RTNL, |
| 1070 | * no change can happen on the qdisc parameters. |
| 1071 | */ |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1072 | |
| 1073 | gopt.direct_pkts = q->direct_pkts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | gopt.version = HTB_VER; |
| 1075 | gopt.rate2quantum = q->rate2quantum; |
| 1076 | gopt.defcls = q->defcls; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1077 | gopt.debug = 0; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1078 | |
| 1079 | nest = nla_nest_start(skb, TCA_OPTIONS); |
| 1080 | if (nest == NULL) |
| 1081 | goto nla_put_failure; |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1082 | if (nla_put(skb, TCA_HTB_INIT, sizeof(gopt), &gopt) || |
| 1083 | nla_put_u32(skb, TCA_HTB_DIRECT_QLEN, q->direct_qlen)) |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 1084 | goto nla_put_failure; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1085 | |
Eric Dumazet | 6f542ef | 2014-03-05 10:14:34 -0800 | [diff] [blame] | 1086 | return nla_nest_end(skb, nest); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1087 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1088 | nla_put_failure: |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1089 | nla_nest_cancel(skb, nest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | return -1; |
| 1091 | } |
| 1092 | |
| 1093 | static int htb_dump_class(struct Qdisc *sch, unsigned long arg, |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1094 | struct sk_buff *skb, struct tcmsg *tcm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1096 | struct htb_class *cl = (struct htb_class *)arg; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1097 | struct nlattr *nest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | struct tc_htb_opt opt; |
| 1099 | |
Eric Dumazet | 6f542ef | 2014-03-05 10:14:34 -0800 | [diff] [blame] | 1100 | /* Its safe to not acquire qdisc lock. As we hold RTNL, |
| 1101 | * no change can happen on the class parameters. |
| 1102 | */ |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1103 | tcm->tcm_parent = cl->parent ? cl->parent->common.classid : TC_H_ROOT; |
| 1104 | tcm->tcm_handle = cl->common.classid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | if (!cl->level && cl->un.leaf.q) |
| 1106 | tcm->tcm_info = cl->un.leaf.q->handle; |
| 1107 | |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1108 | nest = nla_nest_start(skb, TCA_OPTIONS); |
| 1109 | if (nest == NULL) |
| 1110 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1112 | memset(&opt, 0, sizeof(opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | |
Eric Dumazet | 01cb71d | 2013-06-02 13:55:05 +0000 | [diff] [blame] | 1114 | psched_ratecfg_getrate(&opt.rate, &cl->rate); |
Jiri Pirko | 9c10f41 | 2013-02-12 00:12:00 +0000 | [diff] [blame] | 1115 | opt.buffer = PSCHED_NS2TICKS(cl->buffer); |
Eric Dumazet | 01cb71d | 2013-06-02 13:55:05 +0000 | [diff] [blame] | 1116 | psched_ratecfg_getrate(&opt.ceil, &cl->ceil); |
Jiri Pirko | 9c10f41 | 2013-02-12 00:12:00 +0000 | [diff] [blame] | 1117 | opt.cbuffer = PSCHED_NS2TICKS(cl->cbuffer); |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1118 | opt.quantum = cl->quantum; |
| 1119 | opt.prio = cl->prio; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1120 | opt.level = cl->level; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 1121 | if (nla_put(skb, TCA_HTB_PARMS, sizeof(opt), &opt)) |
| 1122 | goto nla_put_failure; |
Eric Dumazet | df62cdf | 2013-09-19 09:10:20 -0700 | [diff] [blame] | 1123 | if ((cl->rate.rate_bytes_ps >= (1ULL << 32)) && |
| 1124 | nla_put_u64(skb, TCA_HTB_RATE64, cl->rate.rate_bytes_ps)) |
| 1125 | goto nla_put_failure; |
| 1126 | if ((cl->ceil.rate_bytes_ps >= (1ULL << 32)) && |
| 1127 | nla_put_u64(skb, TCA_HTB_CEIL64, cl->ceil.rate_bytes_ps)) |
| 1128 | goto nla_put_failure; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1129 | |
Eric Dumazet | 6f542ef | 2014-03-05 10:14:34 -0800 | [diff] [blame] | 1130 | return nla_nest_end(skb, nest); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1131 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1132 | nla_put_failure: |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1133 | nla_nest_cancel(skb, nest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | return -1; |
| 1135 | } |
| 1136 | |
| 1137 | static int |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1138 | htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1140 | struct htb_class *cl = (struct htb_class *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | if (!cl->level && cl->un.leaf.q) |
| 1143 | cl->qstats.qlen = cl->un.leaf.q->q.qlen; |
Eric Dumazet | 5343a7f | 2013-06-04 07:11:48 +0000 | [diff] [blame] | 1144 | cl->xstats.tokens = PSCHED_NS2TICKS(cl->tokens); |
| 1145 | cl->xstats.ctokens = PSCHED_NS2TICKS(cl->ctokens); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | |
| 1147 | if (gnet_stats_copy_basic(d, &cl->bstats) < 0 || |
Eric Dumazet | d250a5f | 2009-10-02 10:32:18 +0000 | [diff] [blame] | 1148 | gnet_stats_copy_rate_est(d, NULL, &cl->rate_est) < 0 || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | gnet_stats_copy_queue(d, &cl->qstats) < 0) |
| 1150 | return -1; |
| 1151 | |
| 1152 | return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats)); |
| 1153 | } |
| 1154 | |
| 1155 | static int htb_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1156 | struct Qdisc **old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1158 | struct htb_class *cl = (struct htb_class *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | |
Patrick McHardy | 5b9a9cc | 2009-09-04 06:41:17 +0000 | [diff] [blame] | 1160 | if (cl->level) |
| 1161 | return -EINVAL; |
| 1162 | if (new == NULL && |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 1163 | (new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, |
Patrick McHardy | 5b9a9cc | 2009-09-04 06:41:17 +0000 | [diff] [blame] | 1164 | cl->common.classid)) == NULL) |
| 1165 | return -ENOBUFS; |
| 1166 | |
| 1167 | sch_tree_lock(sch); |
| 1168 | *old = cl->un.leaf.q; |
| 1169 | cl->un.leaf.q = new; |
| 1170 | if (*old != NULL) { |
| 1171 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
| 1172 | qdisc_reset(*old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
Patrick McHardy | 5b9a9cc | 2009-09-04 06:41:17 +0000 | [diff] [blame] | 1174 | sch_tree_unlock(sch); |
| 1175 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | } |
| 1177 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1178 | static struct Qdisc *htb_leaf(struct Qdisc *sch, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1180 | struct htb_class *cl = (struct htb_class *)arg; |
Patrick McHardy | 5b9a9cc | 2009-09-04 06:41:17 +0000 | [diff] [blame] | 1181 | return !cl->level ? cl->un.leaf.q : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | } |
| 1183 | |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1184 | static void htb_qlen_notify(struct Qdisc *sch, unsigned long arg) |
| 1185 | { |
| 1186 | struct htb_class *cl = (struct htb_class *)arg; |
| 1187 | |
| 1188 | if (cl->un.leaf.q->q.qlen == 0) |
| 1189 | htb_deactivate(qdisc_priv(sch), cl); |
| 1190 | } |
| 1191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | static unsigned long htb_get(struct Qdisc *sch, u32 classid) |
| 1193 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1194 | struct htb_class *cl = htb_find(classid, sch); |
| 1195 | if (cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | cl->refcnt++; |
| 1197 | return (unsigned long)cl; |
| 1198 | } |
| 1199 | |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1200 | static inline int htb_parent_last_child(struct htb_class *cl) |
| 1201 | { |
| 1202 | if (!cl->parent) |
| 1203 | /* the root class */ |
| 1204 | return 0; |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 1205 | if (cl->parent->children > 1) |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1206 | /* not the last child */ |
| 1207 | return 0; |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1208 | return 1; |
| 1209 | } |
| 1210 | |
Jarek Poplawski | 3ba08b0 | 2008-05-03 20:46:29 -0700 | [diff] [blame] | 1211 | static void htb_parent_to_leaf(struct htb_sched *q, struct htb_class *cl, |
| 1212 | struct Qdisc *new_q) |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1213 | { |
| 1214 | struct htb_class *parent = cl->parent; |
| 1215 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1216 | WARN_ON(cl->level || !cl->un.leaf.q || cl->prio_activity); |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1217 | |
Jarek Poplawski | 3ba08b0 | 2008-05-03 20:46:29 -0700 | [diff] [blame] | 1218 | if (parent->cmode != HTB_CAN_SEND) |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 1219 | htb_safe_rb_erase(&parent->pq_node, |
| 1220 | &q->hlevel[parent->level].wait_pq); |
Jarek Poplawski | 3ba08b0 | 2008-05-03 20:46:29 -0700 | [diff] [blame] | 1221 | |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1222 | parent->level = 0; |
| 1223 | memset(&parent->un.inner, 0, sizeof(parent->un.inner)); |
| 1224 | INIT_LIST_HEAD(&parent->un.leaf.drop_list); |
| 1225 | parent->un.leaf.q = new_q ? new_q : &noop_qdisc; |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1226 | parent->tokens = parent->buffer; |
| 1227 | parent->ctokens = parent->cbuffer; |
Eric Dumazet | 5343a7f | 2013-06-04 07:11:48 +0000 | [diff] [blame] | 1228 | parent->t_c = ktime_to_ns(ktime_get()); |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1229 | parent->cmode = HTB_CAN_SEND; |
| 1230 | } |
| 1231 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1232 | static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | if (!cl->level) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1235 | WARN_ON(!cl->un.leaf.q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | qdisc_destroy(cl->un.leaf.q); |
| 1237 | } |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1238 | gen_kill_estimator(&cl->bstats, &cl->rate_est); |
Patrick McHardy | ff31ab5 | 2008-07-01 19:52:38 -0700 | [diff] [blame] | 1239 | tcf_destroy_chain(&cl->filter_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | kfree(cl); |
| 1241 | } |
| 1242 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1243 | static void htb_destroy(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | { |
| 1245 | struct htb_sched *q = qdisc_priv(sch); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1246 | struct hlist_node *next; |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1247 | struct htb_class *cl; |
| 1248 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 1250 | cancel_work_sync(&q->work); |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 1251 | qdisc_watchdog_cancel(&q->watchdog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | /* This line used to be after htb_destroy_class call below |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1253 | * and surprisingly it worked in 2.4. But it must precede it |
| 1254 | * because filter need its target class alive to be able to call |
| 1255 | * unbind_filter on it (without Oops). |
| 1256 | */ |
Patrick McHardy | ff31ab5 | 2008-07-01 19:52:38 -0700 | [diff] [blame] | 1257 | tcf_destroy_chain(&q->filter_list); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1258 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1259 | for (i = 0; i < q->clhash.hashsize; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1260 | hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1261 | tcf_destroy_chain(&cl->filter_list); |
| 1262 | } |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1263 | for (i = 0; i < q->clhash.hashsize; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1264 | hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i], |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1265 | common.hnode) |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1266 | htb_destroy_class(sch, cl); |
| 1267 | } |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1268 | qdisc_class_hash_destroy(&q->clhash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | __skb_queue_purge(&q->direct_queue); |
| 1270 | } |
| 1271 | |
| 1272 | static int htb_delete(struct Qdisc *sch, unsigned long arg) |
| 1273 | { |
| 1274 | struct htb_sched *q = qdisc_priv(sch); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1275 | struct htb_class *cl = (struct htb_class *)arg; |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1276 | unsigned int qlen; |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1277 | struct Qdisc *new_q = NULL; |
| 1278 | int last_child = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | |
Yang Yingliang | a071d27 | 2013-12-23 17:38:59 +0800 | [diff] [blame] | 1280 | /* TODO: why don't allow to delete subtree ? references ? does |
| 1281 | * tc subsys guarantee us that in htb_destroy it holds no class |
| 1282 | * refs so that we can remove children safely there ? |
| 1283 | */ |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 1284 | if (cl->children || cl->filter_cnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | return -EBUSY; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1286 | |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1287 | if (!cl->level && htb_parent_last_child(cl)) { |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 1288 | new_q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 1289 | cl->parent->common.classid); |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1290 | last_child = 1; |
| 1291 | } |
| 1292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | sch_tree_lock(sch); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1294 | |
Patrick McHardy | 814a175e | 2006-11-29 17:34:50 -0800 | [diff] [blame] | 1295 | if (!cl->level) { |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1296 | qlen = cl->un.leaf.q->q.qlen; |
Patrick McHardy | 814a175e | 2006-11-29 17:34:50 -0800 | [diff] [blame] | 1297 | qdisc_reset(cl->un.leaf.q); |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1298 | qdisc_tree_decrease_qlen(cl->un.leaf.q, qlen); |
Patrick McHardy | 814a175e | 2006-11-29 17:34:50 -0800 | [diff] [blame] | 1299 | } |
| 1300 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1301 | /* delete from hash and active; remainder in destroy_class */ |
| 1302 | qdisc_class_hash_remove(&q->clhash, &cl->common); |
Jarek Poplawski | 26b284d | 2008-08-13 15:16:43 -0700 | [diff] [blame] | 1303 | if (cl->parent) |
| 1304 | cl->parent->children--; |
Patrick McHardy | c38c83c | 2007-03-27 14:04:24 -0700 | [diff] [blame] | 1305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | if (cl->prio_activity) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1307 | htb_deactivate(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1309 | if (cl->cmode != HTB_CAN_SEND) |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 1310 | htb_safe_rb_erase(&cl->pq_node, |
| 1311 | &q->hlevel[cl->level].wait_pq); |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1312 | |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1313 | if (last_child) |
Jarek Poplawski | 3ba08b0 | 2008-05-03 20:46:29 -0700 | [diff] [blame] | 1314 | htb_parent_to_leaf(q, cl, new_q); |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1315 | |
Jarek Poplawski | 7cd0a63 | 2009-03-15 20:00:19 -0700 | [diff] [blame] | 1316 | BUG_ON(--cl->refcnt == 0); |
| 1317 | /* |
| 1318 | * This shouldn't happen: we "hold" one cops->get() when called |
| 1319 | * from tc_ctl_tclass; the destroy method is done from cops->put(). |
| 1320 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | |
| 1322 | sch_tree_unlock(sch); |
| 1323 | return 0; |
| 1324 | } |
| 1325 | |
| 1326 | static void htb_put(struct Qdisc *sch, unsigned long arg) |
| 1327 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1328 | struct htb_class *cl = (struct htb_class *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
| 1330 | if (--cl->refcnt == 0) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1331 | htb_destroy_class(sch, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | } |
| 1333 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1334 | static int htb_change_class(struct Qdisc *sch, u32 classid, |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1335 | u32 parentid, struct nlattr **tca, |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1336 | unsigned long *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | { |
| 1338 | int err = -EINVAL; |
| 1339 | struct htb_sched *q = qdisc_priv(sch); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1340 | struct htb_class *cl = (struct htb_class *)*arg, *parent; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1341 | struct nlattr *opt = tca[TCA_OPTIONS]; |
Eric Dumazet | 6906f4e | 2013-03-06 06:49:21 +0000 | [diff] [blame] | 1342 | struct nlattr *tb[TCA_HTB_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | struct tc_htb_opt *hopt; |
Eric Dumazet | df62cdf | 2013-09-19 09:10:20 -0700 | [diff] [blame] | 1344 | u64 rate64, ceil64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | |
| 1346 | /* extract all subattrs from opt attr */ |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 1347 | if (!opt) |
| 1348 | goto failure; |
| 1349 | |
Changli Gao | e18434c | 2010-09-30 06:17:44 +0000 | [diff] [blame] | 1350 | err = nla_parse_nested(tb, TCA_HTB_MAX, opt, htb_policy); |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 1351 | if (err < 0) |
| 1352 | goto failure; |
| 1353 | |
| 1354 | err = -EINVAL; |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 1355 | if (tb[TCA_HTB_PARMS] == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | goto failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1358 | parent = parentid == TC_H_ROOT ? NULL : htb_find(parentid, sch); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1359 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1360 | hopt = nla_data(tb[TCA_HTB_PARMS]); |
Eric Dumazet | 196d97f | 2012-11-05 16:40:49 +0000 | [diff] [blame] | 1361 | if (!hopt->rate.rate || !hopt->ceil.rate) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1362 | goto failure; |
| 1363 | |
Jesper Dangaard Brouer | 8a8e3d8 | 2013-08-14 23:47:11 +0200 | [diff] [blame] | 1364 | /* Keeping backward compatible with rate_table based iproute2 tc */ |
Yang Yingliang | 6b1dd85 | 2013-12-11 15:48:37 +0800 | [diff] [blame] | 1365 | if (hopt->rate.linklayer == TC_LINKLAYER_UNAWARE) |
| 1366 | qdisc_put_rtab(qdisc_get_rtab(&hopt->rate, tb[TCA_HTB_RTAB])); |
| 1367 | |
| 1368 | if (hopt->ceil.linklayer == TC_LINKLAYER_UNAWARE) |
| 1369 | qdisc_put_rtab(qdisc_get_rtab(&hopt->ceil, tb[TCA_HTB_CTAB])); |
Jesper Dangaard Brouer | 8a8e3d8 | 2013-08-14 23:47:11 +0200 | [diff] [blame] | 1370 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1371 | if (!cl) { /* new class */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | struct Qdisc *new_q; |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 1373 | int prio; |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1374 | struct { |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1375 | struct nlattr nla; |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1376 | struct gnet_estimator opt; |
| 1377 | } est = { |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1378 | .nla = { |
| 1379 | .nla_len = nla_attr_size(sizeof(est.opt)), |
| 1380 | .nla_type = TCA_RATE, |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1381 | }, |
| 1382 | .opt = { |
| 1383 | /* 4s interval, 16s averaging constant */ |
| 1384 | .interval = 2, |
| 1385 | .ewma_log = 2, |
| 1386 | }, |
| 1387 | }; |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 1388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | /* check for valid classid */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1390 | if (!classid || TC_H_MAJ(classid ^ sch->handle) || |
| 1391 | htb_find(classid, sch)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | goto failure; |
| 1393 | |
| 1394 | /* check maximal depth */ |
| 1395 | if (parent && parent->parent && parent->parent->level < 2) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1396 | pr_err("htb: tree is too deep\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | goto failure; |
| 1398 | } |
| 1399 | err = -ENOBUFS; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1400 | cl = kzalloc(sizeof(*cl), GFP_KERNEL); |
| 1401 | if (!cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | goto failure; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1403 | |
Eric Dumazet | 64153ce | 2013-06-06 14:53:16 -0700 | [diff] [blame] | 1404 | if (htb_rate_est || tca[TCA_RATE]) { |
| 1405 | err = gen_new_estimator(&cl->bstats, &cl->rate_est, |
| 1406 | qdisc_root_sleeping_lock(sch), |
| 1407 | tca[TCA_RATE] ? : &est.nla); |
| 1408 | if (err) { |
| 1409 | kfree(cl); |
| 1410 | goto failure; |
| 1411 | } |
Stephen Hemminger | 71bcb09 | 2008-11-25 21:13:31 -0800 | [diff] [blame] | 1412 | } |
| 1413 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | cl->refcnt = 1; |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 1415 | cl->children = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | INIT_LIST_HEAD(&cl->un.leaf.drop_list); |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 1417 | RB_CLEAR_NODE(&cl->pq_node); |
| 1418 | |
| 1419 | for (prio = 0; prio < TC_HTB_NUMPRIO; prio++) |
| 1420 | RB_CLEAR_NODE(&cl->node[prio]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | |
| 1422 | /* create leaf qdisc early because it uses kmalloc(GFP_KERNEL) |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1423 | * so that can't be used inside of sch_tree_lock |
| 1424 | * -- thanks to Karlis Peisenieks |
| 1425 | */ |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 1426 | new_q = qdisc_create_dflt(sch->dev_queue, |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 1427 | &pfifo_qdisc_ops, classid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | sch_tree_lock(sch); |
| 1429 | if (parent && !parent->level) { |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1430 | unsigned int qlen = parent->un.leaf.q->q.qlen; |
| 1431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | /* turn parent into inner node */ |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1433 | qdisc_reset(parent->un.leaf.q); |
| 1434 | qdisc_tree_decrease_qlen(parent->un.leaf.q, qlen); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1435 | qdisc_destroy(parent->un.leaf.q); |
| 1436 | if (parent->prio_activity) |
| 1437 | htb_deactivate(q, parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | |
| 1439 | /* remove from evt list because of level change */ |
| 1440 | if (parent->cmode != HTB_CAN_SEND) { |
Eric Dumazet | c936463 | 2013-06-15 03:30:10 -0700 | [diff] [blame] | 1441 | htb_safe_rb_erase(&parent->pq_node, &q->hlevel[0].wait_pq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | parent->cmode = HTB_CAN_SEND; |
| 1443 | } |
| 1444 | parent->level = (parent->parent ? parent->parent->level |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1445 | : TC_HTB_MAXDEPTH) - 1; |
| 1446 | memset(&parent->un.inner, 0, sizeof(parent->un.inner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | } |
| 1448 | /* leaf (we) needs elementary qdisc */ |
| 1449 | cl->un.leaf.q = new_q ? new_q : &noop_qdisc; |
| 1450 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1451 | cl->common.classid = classid; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1452 | cl->parent = parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | |
| 1454 | /* set class to be in HTB_CAN_SEND state */ |
Jiri Pirko | b9a7afd | 2013-02-12 00:12:02 +0000 | [diff] [blame] | 1455 | cl->tokens = PSCHED_TICKS2NS(hopt->buffer); |
| 1456 | cl->ctokens = PSCHED_TICKS2NS(hopt->cbuffer); |
Eric Dumazet | 5343a7f | 2013-06-04 07:11:48 +0000 | [diff] [blame] | 1457 | cl->mbuffer = 60ULL * NSEC_PER_SEC; /* 1min */ |
| 1458 | cl->t_c = ktime_to_ns(ktime_get()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | cl->cmode = HTB_CAN_SEND; |
| 1460 | |
| 1461 | /* attach to the hash list and parent's family */ |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1462 | qdisc_class_hash_insert(&q->clhash, &cl->common); |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 1463 | if (parent) |
| 1464 | parent->children++; |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1465 | } else { |
Stephen Hemminger | 71bcb09 | 2008-11-25 21:13:31 -0800 | [diff] [blame] | 1466 | if (tca[TCA_RATE]) { |
| 1467 | err = gen_replace_estimator(&cl->bstats, &cl->rate_est, |
| 1468 | qdisc_root_sleeping_lock(sch), |
| 1469 | tca[TCA_RATE]); |
| 1470 | if (err) |
| 1471 | return err; |
| 1472 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1473 | sch_tree_lock(sch); |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1474 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | |
Yang Yingliang | 1598f7c | 2013-12-10 14:59:28 +0800 | [diff] [blame] | 1476 | rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0; |
| 1477 | |
| 1478 | ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0; |
| 1479 | |
| 1480 | psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64); |
| 1481 | psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64); |
| 1482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | /* it used to be a nasty bug here, we have to check that node |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1484 | * is really leaf before changing cl->un.leaf ! |
| 1485 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | if (!cl->level) { |
Yang Yingliang | 1598f7c | 2013-12-10 14:59:28 +0800 | [diff] [blame] | 1487 | u64 quantum = cl->rate.rate_bytes_ps; |
| 1488 | |
| 1489 | do_div(quantum, q->rate2quantum); |
| 1490 | cl->quantum = min_t(u64, quantum, INT_MAX); |
| 1491 | |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1492 | if (!hopt->quantum && cl->quantum < 1000) { |
Yang Yingliang | c17988a | 2013-12-23 17:38:58 +0800 | [diff] [blame] | 1493 | pr_warn("HTB: quantum of class %X is small. Consider r2q change.\n", |
| 1494 | cl->common.classid); |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1495 | cl->quantum = 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | } |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1497 | if (!hopt->quantum && cl->quantum > 200000) { |
Yang Yingliang | c17988a | 2013-12-23 17:38:58 +0800 | [diff] [blame] | 1498 | pr_warn("HTB: quantum of class %X is big. Consider r2q change.\n", |
| 1499 | cl->common.classid); |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1500 | cl->quantum = 200000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | } |
| 1502 | if (hopt->quantum) |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1503 | cl->quantum = hopt->quantum; |
| 1504 | if ((cl->prio = hopt->prio) >= TC_HTB_NUMPRIO) |
| 1505 | cl->prio = TC_HTB_NUMPRIO - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | } |
| 1507 | |
Jiri Pirko | 324f5aa | 2013-02-12 00:11:59 +0000 | [diff] [blame] | 1508 | cl->buffer = PSCHED_TICKS2NS(hopt->buffer); |
Vimalkumar | f3ad857 | 2013-09-10 17:36:37 -0700 | [diff] [blame] | 1509 | cl->cbuffer = PSCHED_TICKS2NS(hopt->cbuffer); |
Vimalkumar | 56b765b | 2012-10-31 06:04:11 +0000 | [diff] [blame] | 1510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | sch_tree_unlock(sch); |
| 1512 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1513 | qdisc_class_hash_grow(sch, &q->clhash); |
| 1514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | *arg = (unsigned long)cl; |
| 1516 | return 0; |
| 1517 | |
| 1518 | failure: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | return err; |
| 1520 | } |
| 1521 | |
| 1522 | static struct tcf_proto **htb_find_tcf(struct Qdisc *sch, unsigned long arg) |
| 1523 | { |
| 1524 | struct htb_sched *q = qdisc_priv(sch); |
| 1525 | struct htb_class *cl = (struct htb_class *)arg; |
| 1526 | struct tcf_proto **fl = cl ? &cl->filter_list : &q->filter_list; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | return fl; |
| 1529 | } |
| 1530 | |
| 1531 | static unsigned long htb_bind_filter(struct Qdisc *sch, unsigned long parent, |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1532 | u32 classid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1534 | struct htb_class *cl = htb_find(classid, sch); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | /*if (cl && !cl->level) return 0; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1537 | * The line above used to be there to prevent attaching filters to |
| 1538 | * leaves. But at least tc_index filter uses this just to get class |
| 1539 | * for other reasons so that we have to allow for it. |
| 1540 | * ---- |
| 1541 | * 19.6.2002 As Werner explained it is ok - bind filter is just |
| 1542 | * another way to "lock" the class - unlike "get" this lock can |
| 1543 | * be broken by class during destroy IIUC. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1545 | if (cl) |
| 1546 | cl->filter_cnt++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | return (unsigned long)cl; |
| 1548 | } |
| 1549 | |
| 1550 | static void htb_unbind_filter(struct Qdisc *sch, unsigned long arg) |
| 1551 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | struct htb_class *cl = (struct htb_class *)arg; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1553 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1554 | if (cl) |
| 1555 | cl->filter_cnt--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | } |
| 1557 | |
| 1558 | static void htb_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
| 1559 | { |
| 1560 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1561 | struct htb_class *cl; |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1562 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | |
| 1564 | if (arg->stop) |
| 1565 | return; |
| 1566 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1567 | for (i = 0; i < q->clhash.hashsize; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1568 | hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | if (arg->count < arg->skip) { |
| 1570 | arg->count++; |
| 1571 | continue; |
| 1572 | } |
| 1573 | if (arg->fn(sch, (unsigned long)cl, arg) < 0) { |
| 1574 | arg->stop = 1; |
| 1575 | return; |
| 1576 | } |
| 1577 | arg->count++; |
| 1578 | } |
| 1579 | } |
| 1580 | } |
| 1581 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1582 | static const struct Qdisc_class_ops htb_class_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | .graft = htb_graft, |
| 1584 | .leaf = htb_leaf, |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1585 | .qlen_notify = htb_qlen_notify, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | .get = htb_get, |
| 1587 | .put = htb_put, |
| 1588 | .change = htb_change_class, |
| 1589 | .delete = htb_delete, |
| 1590 | .walk = htb_walk, |
| 1591 | .tcf_chain = htb_find_tcf, |
| 1592 | .bind_tcf = htb_bind_filter, |
| 1593 | .unbind_tcf = htb_unbind_filter, |
| 1594 | .dump = htb_dump_class, |
| 1595 | .dump_stats = htb_dump_class_stats, |
| 1596 | }; |
| 1597 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1598 | static struct Qdisc_ops htb_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | .cl_ops = &htb_class_ops, |
| 1600 | .id = "htb", |
| 1601 | .priv_size = sizeof(struct htb_sched), |
| 1602 | .enqueue = htb_enqueue, |
| 1603 | .dequeue = htb_dequeue, |
Jarek Poplawski | 77be155 | 2008-10-31 00:47:01 -0700 | [diff] [blame] | 1604 | .peek = qdisc_peek_dequeued, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | .drop = htb_drop, |
| 1606 | .init = htb_init, |
| 1607 | .reset = htb_reset, |
| 1608 | .destroy = htb_destroy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | .dump = htb_dump, |
| 1610 | .owner = THIS_MODULE, |
| 1611 | }; |
| 1612 | |
| 1613 | static int __init htb_module_init(void) |
| 1614 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1615 | return register_qdisc(&htb_qdisc_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1617 | static void __exit htb_module_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1619 | unregister_qdisc(&htb_qdisc_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | module_init(htb_module_init) |
| 1623 | module_exit(htb_module_exit) |
| 1624 | MODULE_LICENSE("GPL"); |