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> |
| 41 | #include <net/pkt_sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | /* HTB algorithm. |
| 44 | Author: devik@cdi.cz |
| 45 | ======================================================================== |
| 46 | 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] | 47 | it allows to assign priority to each class in hierarchy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | In fact it is another implementation of Floyd's formal sharing. |
| 49 | |
| 50 | Levels: |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 51 | Each class is assigned level. Leaf has ALWAYS level 0 and root |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | classes have level TC_HTB_MAXDEPTH-1. Interior nodes has level |
| 53 | one less than their parent. |
| 54 | */ |
| 55 | |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 56 | 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] | 57 | #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] | 58 | |
| 59 | #if HTB_VER >> 16 != TC_HTB_PROTOVER |
| 60 | #error "Mismatched sch_htb.c and pkt_sch.h" |
| 61 | #endif |
| 62 | |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 63 | /* Module parameter and sysfs export */ |
| 64 | module_param (htb_hysteresis, int, 0640); |
| 65 | MODULE_PARM_DESC(htb_hysteresis, "Hysteresis mode, less CPU load, less accurate"); |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | /* used internaly to keep status of single class */ |
| 68 | enum htb_cmode { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 69 | HTB_CANT_SEND, /* class can't send and can't borrow */ |
| 70 | HTB_MAY_BORROW, /* class can't send but may borrow */ |
| 71 | HTB_CAN_SEND /* class can send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | }; |
| 73 | |
| 74 | /* interior & leaf nodes; props specific to leaves are marked L: */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 75 | struct htb_class { |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 76 | struct Qdisc_class_common common; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 77 | /* general class parameters */ |
Eric Dumazet | c1a8f1f | 2009-08-16 09:36:49 +0000 | [diff] [blame] | 78 | struct gnet_stats_basic_packed bstats; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 79 | struct gnet_stats_queue qstats; |
| 80 | struct gnet_stats_rate_est rate_est; |
| 81 | struct tc_htb_xstats xstats; /* our special stats */ |
| 82 | int refcnt; /* usage count of this class */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 84 | /* topology */ |
| 85 | int level; /* our level (see above) */ |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 86 | unsigned int children; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 87 | struct htb_class *parent; /* parent class */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 89 | int prio; /* these two are used only by leaves... */ |
| 90 | int quantum; /* but stored for parent-to-leaf return */ |
| 91 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 92 | union { |
| 93 | struct htb_class_leaf { |
| 94 | struct Qdisc *q; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 95 | int deficit[TC_HTB_MAXDEPTH]; |
| 96 | struct list_head drop_list; |
| 97 | } leaf; |
| 98 | struct htb_class_inner { |
| 99 | struct rb_root feed[TC_HTB_NUMPRIO]; /* feed trees */ |
| 100 | struct rb_node *ptr[TC_HTB_NUMPRIO]; /* current class ptr */ |
| 101 | /* When class changes from state 1->2 and disconnects from |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 102 | * parent's feed then we lost ptr value and start from the |
| 103 | * first child again. Here we store classid of the |
| 104 | * last valid ptr (used when ptr is NULL). |
| 105 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 106 | u32 last_ptr_id[TC_HTB_NUMPRIO]; |
| 107 | } inner; |
| 108 | } un; |
| 109 | struct rb_node node[TC_HTB_NUMPRIO]; /* node for self or feed tree */ |
| 110 | struct rb_node pq_node; /* node for event queue */ |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 111 | psched_time_t pq_key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 113 | int prio_activity; /* for which prios are we active */ |
| 114 | enum htb_cmode cmode; /* current mode of the class */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 116 | /* class attached filters */ |
| 117 | struct tcf_proto *filter_list; |
| 118 | int filter_cnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 120 | /* token bucket parameters */ |
| 121 | struct qdisc_rate_table *rate; /* rate table of the class itself */ |
| 122 | struct qdisc_rate_table *ceil; /* ceiling rate (limits borrows too) */ |
| 123 | long buffer, cbuffer; /* token bucket depth/rate */ |
| 124 | psched_tdiff_t mbuffer; /* max wait time */ |
| 125 | long tokens, ctokens; /* current number of tokens */ |
| 126 | psched_time_t t_c; /* checkpoint time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | }; |
| 128 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 129 | struct htb_sched { |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 130 | struct Qdisc_class_hash clhash; |
Stephen Hemminger | 0cef296 | 2006-08-10 23:35:38 -0700 | [diff] [blame] | 131 | struct list_head drops[TC_HTB_NUMPRIO];/* active leaves (for drops) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 133 | /* self list - roots of self generating tree */ |
| 134 | struct rb_root row[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; |
| 135 | int row_mask[TC_HTB_MAXDEPTH]; |
| 136 | struct rb_node *ptr[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; |
| 137 | u32 last_ptr_id[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 139 | /* self wait list - roots of wait PQs per row */ |
| 140 | struct rb_root wait_pq[TC_HTB_MAXDEPTH]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 142 | /* time of nearest event per level (row) */ |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 143 | psched_time_t near_ev_cache[TC_HTB_MAXDEPTH]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 145 | int defcls; /* class where unclassified flows go to */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 147 | /* filters for qdisc itself */ |
| 148 | struct tcf_proto *filter_list; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 149 | |
| 150 | int rate2quantum; /* quant = rate / rate2quantum */ |
| 151 | psched_time_t now; /* cached dequeue time */ |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 152 | struct qdisc_watchdog watchdog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 154 | /* non shaped skbs; let them go directly thru */ |
| 155 | struct sk_buff_head direct_queue; |
| 156 | int direct_qlen; /* max qlen of above */ |
| 157 | |
| 158 | long direct_pkts; |
Jarek Poplawski | e82181d | 2009-02-01 01:13:05 -0800 | [diff] [blame] | 159 | |
| 160 | #define HTB_WARN_TOOMANYEVENTS 0x1 |
| 161 | unsigned int warned; /* only one warning */ |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 162 | struct work_struct work; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | }; |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | /* find class in global hash table using given handle */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 166 | static inline struct htb_class *htb_find(u32 handle, struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
| 168 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 169 | struct Qdisc_class_common *clc; |
Stephen Hemminger | 0cef296 | 2006-08-10 23:35:38 -0700 | [diff] [blame] | 170 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 171 | clc = qdisc_class_find(&q->clhash, handle); |
| 172 | if (clc == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | return NULL; |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 174 | return container_of(clc, struct htb_class, common); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | /** |
| 178 | * htb_classify - classify a packet into class |
| 179 | * |
| 180 | * It returns NULL if the packet should be dropped or -1 if the packet |
| 181 | * should be passed directly thru. In all other cases leaf class is returned. |
| 182 | * We allow direct class selection by classid in priority. The we examine |
| 183 | * filters in qdisc and in inner nodes (if higher filter points to the inner |
| 184 | * 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] | 185 | * 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^] | 186 | * 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] | 187 | * then finish and return direct queue. |
| 188 | */ |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 189 | #define HTB_DIRECT ((struct htb_class *)-1L) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 191 | static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch, |
| 192 | int *qerr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
| 194 | struct htb_sched *q = qdisc_priv(sch); |
| 195 | struct htb_class *cl; |
| 196 | struct tcf_result res; |
| 197 | struct tcf_proto *tcf; |
| 198 | int result; |
| 199 | |
| 200 | /* allow to select class by setting skb->priority to valid classid; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 201 | * note that nfmark can be used too by attaching filter fw with no |
| 202 | * rules in it |
| 203 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | if (skb->priority == sch->handle) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 205 | return HTB_DIRECT; /* X:0 (direct flow) selected */ |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 206 | cl = htb_find(skb->priority, sch); |
| 207 | if (cl && cl->level == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | return cl; |
| 209 | |
Jarek Poplawski | c27f339 | 2008-08-04 22:39:11 -0700 | [diff] [blame] | 210 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | tcf = q->filter_list; |
| 212 | while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) { |
| 213 | #ifdef CONFIG_NET_CLS_ACT |
| 214 | switch (result) { |
| 215 | case TC_ACT_QUEUED: |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 216 | case TC_ACT_STOLEN: |
Jarek Poplawski | 378a2f0 | 2008-08-04 22:31:03 -0700 | [diff] [blame] | 217 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | case TC_ACT_SHOT: |
| 219 | return NULL; |
| 220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | #endif |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 222 | cl = (void *)res.class; |
| 223 | if (!cl) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | if (res.classid == sch->handle) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 225 | return HTB_DIRECT; /* X:0 (direct flow) */ |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 226 | cl = htb_find(res.classid, sch); |
| 227 | if (!cl) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 228 | break; /* filter selected invalid classid */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | if (!cl->level) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 231 | return cl; /* we hit leaf; return it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
| 233 | /* we have got inner class; apply inner filter chain */ |
| 234 | tcf = cl->filter_list; |
| 235 | } |
| 236 | /* classification failed; try to use default class */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 237 | 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] | 238 | if (!cl || cl->level) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 239 | return HTB_DIRECT; /* bad default .. this is safe bet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | return cl; |
| 241 | } |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | /** |
| 244 | * htb_add_to_id_tree - adds class to the round robin list |
| 245 | * |
| 246 | * Routine adds class to the list (actually tree) sorted by classid. |
| 247 | * Make sure that class is not already on such list for given prio. |
| 248 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 249 | static void htb_add_to_id_tree(struct rb_root *root, |
| 250 | struct htb_class *cl, int prio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
| 252 | struct rb_node **p = &root->rb_node, *parent = NULL; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | while (*p) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 255 | struct htb_class *c; |
| 256 | parent = *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | c = rb_entry(parent, struct htb_class, node[prio]); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 258 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 259 | if (cl->common.classid > c->common.classid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | p = &parent->rb_right; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 261 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | p = &parent->rb_left; |
| 263 | } |
| 264 | rb_link_node(&cl->node[prio], parent, p); |
| 265 | rb_insert_color(&cl->node[prio], root); |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * htb_add_to_wait_tree - adds class to the event queue with delay |
| 270 | * |
| 271 | * The class is added to priority event queue to indicate that class will |
| 272 | * change its mode in cl->pq_key microseconds. Make sure that class is not |
| 273 | * already in the queue. |
| 274 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 275 | static void htb_add_to_wait_tree(struct htb_sched *q, |
| 276 | struct htb_class *cl, long delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | { |
| 278 | struct rb_node **p = &q->wait_pq[cl->level].rb_node, *parent = NULL; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 279 | |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 280 | cl->pq_key = q->now + delay; |
| 281 | if (cl->pq_key == q->now) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | cl->pq_key++; |
| 283 | |
| 284 | /* update the nearest event cache */ |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 285 | if (q->near_ev_cache[cl->level] > cl->pq_key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | q->near_ev_cache[cl->level] = cl->pq_key; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | while (*p) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 289 | struct htb_class *c; |
| 290 | parent = *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | c = rb_entry(parent, struct htb_class, pq_node); |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 292 | if (cl->pq_key >= c->pq_key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | p = &parent->rb_right; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 294 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | p = &parent->rb_left; |
| 296 | } |
| 297 | rb_link_node(&cl->pq_node, parent, p); |
| 298 | rb_insert_color(&cl->pq_node, &q->wait_pq[cl->level]); |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * htb_next_rb_node - finds next node in binary tree |
| 303 | * |
| 304 | * When we are past last key we return NULL. |
| 305 | * Average complexity is 2 steps per call. |
| 306 | */ |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 307 | static inline void htb_next_rb_node(struct rb_node **n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
| 309 | *n = rb_next(*n); |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * htb_add_class_to_row - add class to its row |
| 314 | * |
| 315 | * The class is added to row at priorities marked in mask. |
| 316 | * It does nothing if mask == 0. |
| 317 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 318 | static inline void htb_add_class_to_row(struct htb_sched *q, |
| 319 | struct htb_class *cl, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | q->row_mask[cl->level] |= mask; |
| 322 | while (mask) { |
| 323 | int prio = ffz(~mask); |
| 324 | mask &= ~(1 << prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 325 | htb_add_to_id_tree(q->row[cl->level] + prio, cl, prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
| 327 | } |
| 328 | |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 329 | /* If this triggers, it is a bug in this code, but it need not be fatal */ |
| 330 | static void htb_safe_rb_erase(struct rb_node *rb, struct rb_root *root) |
| 331 | { |
Ismail Donmez | 81771b3 | 2006-10-03 13:49:10 -0700 | [diff] [blame] | 332 | if (RB_EMPTY_NODE(rb)) { |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 333 | WARN_ON(1); |
| 334 | } else { |
| 335 | rb_erase(rb, root); |
| 336 | RB_CLEAR_NODE(rb); |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | /** |
| 342 | * htb_remove_class_from_row - removes class from its row |
| 343 | * |
| 344 | * The class is removed from row at priorities marked in mask. |
| 345 | * It does nothing if mask == 0. |
| 346 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 347 | static inline void htb_remove_class_from_row(struct htb_sched *q, |
| 348 | struct htb_class *cl, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
| 350 | int m = 0; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | while (mask) { |
| 353 | int prio = ffz(~mask); |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | mask &= ~(1 << prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 356 | if (q->ptr[cl->level][prio] == cl->node + prio) |
| 357 | htb_next_rb_node(q->ptr[cl->level] + prio); |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 358 | |
| 359 | htb_safe_rb_erase(cl->node + prio, q->row[cl->level] + prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 360 | if (!q->row[cl->level][prio].rb_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | m |= 1 << prio; |
| 362 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | q->row_mask[cl->level] &= ~m; |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * htb_activate_prios - creates active classe's feed chain |
| 368 | * |
| 369 | * The class is connected to ancestors and/or appropriate rows |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 370 | * for priorities it is participating on. cl->cmode must be new |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | * (activated) mode. It does nothing if cl->prio_activity == 0. |
| 372 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 373 | 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] | 374 | { |
| 375 | struct htb_class *p = cl->parent; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 376 | long m, mask = cl->prio_activity; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
| 378 | while (cl->cmode == HTB_MAY_BORROW && p && mask) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 379 | m = mask; |
| 380 | while (m) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | int prio = ffz(~m); |
| 382 | m &= ~(1 << prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | if (p->un.inner.feed[prio].rb_node) |
| 385 | /* parent already has its feed in use so that |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 386 | * reset bit in mask as parent is already ok |
| 387 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | mask &= ~(1 << prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 389 | |
| 390 | htb_add_to_id_tree(p->un.inner.feed + prio, cl, prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | p->prio_activity |= mask; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 393 | cl = p; |
| 394 | p = cl->parent; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | if (cl->cmode == HTB_CAN_SEND && mask) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 398 | htb_add_class_to_row(q, cl, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | /** |
| 402 | * htb_deactivate_prios - remove class from feed chain |
| 403 | * |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 404 | * cl->cmode must represent old mode (before deactivation). It does |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | * nothing if cl->prio_activity == 0. Class is removed from all feed |
| 406 | * chains and rows. |
| 407 | */ |
| 408 | static void htb_deactivate_prios(struct htb_sched *q, struct htb_class *cl) |
| 409 | { |
| 410 | struct htb_class *p = cl->parent; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 411 | long m, mask = cl->prio_activity; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | while (cl->cmode == HTB_MAY_BORROW && p && mask) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 414 | m = mask; |
| 415 | mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | while (m) { |
| 417 | int prio = ffz(~m); |
| 418 | m &= ~(1 << prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 419 | |
| 420 | if (p->un.inner.ptr[prio] == cl->node + prio) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* we are removing child which is pointed to from |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 422 | * parent feed - forget the pointer but remember |
| 423 | * classid |
| 424 | */ |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 425 | p->un.inner.last_ptr_id[prio] = cl->common.classid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | p->un.inner.ptr[prio] = NULL; |
| 427 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 428 | |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 429 | htb_safe_rb_erase(cl->node + prio, p->un.inner.feed + prio); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 430 | |
| 431 | if (!p->un.inner.feed[prio].rb_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | mask |= 1 << prio; |
| 433 | } |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | p->prio_activity &= ~mask; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 436 | cl = p; |
| 437 | p = cl->parent; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 438 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 440 | if (cl->cmode == HTB_CAN_SEND && mask) |
| 441 | htb_remove_class_from_row(q, cl, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 444 | static inline long htb_lowater(const struct htb_class *cl) |
| 445 | { |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 446 | if (htb_hysteresis) |
| 447 | return cl->cmode != HTB_CANT_SEND ? -cl->cbuffer : 0; |
| 448 | else |
| 449 | return 0; |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 450 | } |
| 451 | static inline long htb_hiwater(const struct htb_class *cl) |
| 452 | { |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 453 | if (htb_hysteresis) |
| 454 | return cl->cmode == HTB_CAN_SEND ? -cl->buffer : 0; |
| 455 | else |
| 456 | return 0; |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 457 | } |
Jesper Dangaard Brouer | 47083fc | 2008-06-16 16:39:32 -0700 | [diff] [blame] | 458 | |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | /** |
| 461 | * htb_class_mode - computes and returns current class mode |
| 462 | * |
| 463 | * It computes cl's mode at time cl->t_c+diff and returns it. If mode |
| 464 | * 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] | 465 | * from now to time when cl will change its state. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | * 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] | 467 | * at cl->{c,}tokens == 0 but there can rather be hysteresis of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | * 0 .. -cl->{c,}buffer range. It is meant to limit number of |
| 469 | * mode transitions per time unit. The speed gain is about 1/6. |
| 470 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 471 | static inline enum htb_cmode |
| 472 | htb_class_mode(struct htb_class *cl, long *diff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 474 | long toks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 476 | if ((toks = (cl->ctokens + *diff)) < htb_lowater(cl)) { |
| 477 | *diff = -toks; |
| 478 | return HTB_CANT_SEND; |
| 479 | } |
Stephen Hemminger | 18a63e8 | 2006-08-10 23:34:02 -0700 | [diff] [blame] | 480 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 481 | if ((toks = (cl->tokens + *diff)) >= htb_hiwater(cl)) |
| 482 | return HTB_CAN_SEND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 484 | *diff = -toks; |
| 485 | return HTB_MAY_BORROW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | /** |
| 489 | * htb_change_class_mode - changes classe's mode |
| 490 | * |
| 491 | * This should be the only way how to change classe's mode under normal |
| 492 | * cirsumstances. Routine will update feed lists linkage, change mode |
| 493 | * and add class to the wait event queue if appropriate. New mode should |
| 494 | * be different from old one and cl->pq_key has to be valid if changing |
| 495 | * to mode other than HTB_CAN_SEND (see htb_add_to_wait_tree). |
| 496 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 497 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | htb_change_class_mode(struct htb_sched *q, struct htb_class *cl, long *diff) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 499 | { |
| 500 | enum htb_cmode new_mode = htb_class_mode(cl, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
| 502 | if (new_mode == cl->cmode) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 503 | return; |
| 504 | |
| 505 | if (cl->prio_activity) { /* not necessary: speed optimization */ |
| 506 | if (cl->cmode != HTB_CANT_SEND) |
| 507 | htb_deactivate_prios(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | cl->cmode = new_mode; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 509 | if (new_mode != HTB_CANT_SEND) |
| 510 | htb_activate_prios(q, cl); |
| 511 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | cl->cmode = new_mode; |
| 513 | } |
| 514 | |
| 515 | /** |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 516 | * htb_activate - inserts leaf cl into appropriate active feeds |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | * |
| 518 | * Routine learns (new) priority of leaf and activates feed chain |
| 519 | * for the prio. It can be called on already active leaf safely. |
| 520 | * It also adds leaf into droplist. |
| 521 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 522 | 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] | 523 | { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 524 | 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] | 525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | if (!cl->prio_activity) { |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 527 | cl->prio_activity = 1 << cl->prio; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 528 | htb_activate_prios(q, cl); |
| 529 | list_add_tail(&cl->un.leaf.drop_list, |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 530 | q->drops + cl->prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
| 532 | } |
| 533 | |
| 534 | /** |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 535 | * htb_deactivate - remove leaf cl from active feeds |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | * |
| 537 | * Make sure that leaf is active. In the other words it can't be called |
| 538 | * with non-active leaf. It also removes class from the drop list. |
| 539 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 540 | 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] | 541 | { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 542 | WARN_ON(!cl->prio_activity); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 543 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 544 | htb_deactivate_prios(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | cl->prio_activity = 0; |
| 546 | list_del_init(&cl->un.leaf.drop_list); |
| 547 | } |
| 548 | |
| 549 | static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
| 550 | { |
Jarek Poplawski | f30ab41 | 2008-11-13 22:56:30 -0800 | [diff] [blame] | 551 | int uninitialized_var(ret); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 552 | struct htb_sched *q = qdisc_priv(sch); |
| 553 | struct htb_class *cl = htb_classify(skb, sch, &ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 555 | if (cl == HTB_DIRECT) { |
| 556 | /* enqueue to helper queue */ |
| 557 | if (q->direct_queue.qlen < q->direct_qlen) { |
| 558 | __skb_queue_tail(&q->direct_queue, skb); |
| 559 | q->direct_pkts++; |
| 560 | } else { |
| 561 | kfree_skb(skb); |
| 562 | sch->qstats.drops++; |
| 563 | return NET_XMIT_DROP; |
| 564 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | #ifdef CONFIG_NET_CLS_ACT |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 566 | } else if (!cl) { |
Jarek Poplawski | c27f339 | 2008-08-04 22:39:11 -0700 | [diff] [blame] | 567 | if (ret & __NET_XMIT_BYPASS) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 568 | sch->qstats.drops++; |
| 569 | kfree_skb(skb); |
| 570 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | #endif |
Jarek Poplawski | 378a2f0 | 2008-08-04 22:31:03 -0700 | [diff] [blame] | 572 | } else if ((ret = qdisc_enqueue(skb, cl->un.leaf.q)) != NET_XMIT_SUCCESS) { |
| 573 | if (net_xmit_drop_count(ret)) { |
| 574 | sch->qstats.drops++; |
| 575 | cl->qstats.drops++; |
| 576 | } |
David S. Miller | 6974765 | 2008-08-17 23:55:36 -0700 | [diff] [blame] | 577 | return ret; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 578 | } else { |
Eric Dumazet | bfe0d02 | 2011-01-09 08:30:54 +0000 | [diff] [blame] | 579 | bstats_update(&cl->bstats, skb); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 580 | htb_activate(q, cl); |
| 581 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 583 | sch->q.qlen++; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 584 | return NET_XMIT_SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | } |
| 586 | |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 587 | static inline void htb_accnt_tokens(struct htb_class *cl, int bytes, long diff) |
| 588 | { |
| 589 | long toks = diff + cl->tokens; |
| 590 | |
| 591 | if (toks > cl->buffer) |
| 592 | toks = cl->buffer; |
| 593 | toks -= (long) qdisc_l2t(cl->rate, bytes); |
| 594 | if (toks <= -cl->mbuffer) |
| 595 | toks = 1 - cl->mbuffer; |
| 596 | |
| 597 | cl->tokens = toks; |
| 598 | } |
| 599 | |
| 600 | static inline void htb_accnt_ctokens(struct htb_class *cl, int bytes, long diff) |
| 601 | { |
| 602 | long toks = diff + cl->ctokens; |
| 603 | |
| 604 | if (toks > cl->cbuffer) |
| 605 | toks = cl->cbuffer; |
| 606 | toks -= (long) qdisc_l2t(cl->ceil, bytes); |
| 607 | if (toks <= -cl->mbuffer) |
| 608 | toks = 1 - cl->mbuffer; |
| 609 | |
| 610 | cl->ctokens = toks; |
| 611 | } |
| 612 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | /** |
| 614 | * htb_charge_class - charges amount "bytes" to leaf and ancestors |
| 615 | * |
| 616 | * Routine assumes that packet "bytes" long was dequeued from leaf cl |
| 617 | * borrowing from "level". It accounts bytes to ceil leaky bucket for |
| 618 | * leaf and all ancestors and to rate bucket for ancestors at levels |
| 619 | * "level" and higher. It also handles possible change of mode resulting |
| 620 | * from the update. Note that mode can also increase here (MAY_BORROW to |
| 621 | * CAN_SEND) because we can use more precise clock that event queue here. |
| 622 | * In such case we remove class from event queue first. |
| 623 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 624 | 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] | 625 | int level, struct sk_buff *skb) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 626 | { |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 627 | int bytes = qdisc_pkt_len(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | enum htb_cmode old_mode; |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 629 | long diff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
| 631 | while (cl) { |
Patrick McHardy | 03cc45c | 2007-03-23 11:29:11 -0700 | [diff] [blame] | 632 | diff = psched_tdiff_bounded(q->now, cl->t_c, cl->mbuffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | if (cl->level >= level) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 634 | if (cl->level == level) |
| 635 | cl->xstats.lends++; |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 636 | htb_accnt_tokens(cl, bytes, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | } else { |
| 638 | cl->xstats.borrows++; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 639 | cl->tokens += diff; /* we moved t_c; update tokens */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | } |
Jarek Poplawski | 59e4220 | 2008-12-03 21:17:27 -0800 | [diff] [blame] | 641 | htb_accnt_ctokens(cl, bytes, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | cl->t_c = q->now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 644 | old_mode = cl->cmode; |
| 645 | diff = 0; |
| 646 | htb_change_class_mode(q, cl, &diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | if (old_mode != cl->cmode) { |
| 648 | if (old_mode != HTB_CAN_SEND) |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 649 | htb_safe_rb_erase(&cl->pq_node, q->wait_pq + cl->level); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | if (cl->cmode != HTB_CAN_SEND) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 651 | htb_add_to_wait_tree(q, cl, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
Eric Dumazet | bfe0d02 | 2011-01-09 08:30:54 +0000 | [diff] [blame] | 654 | /* update basic stats except for leaves which are already updated */ |
| 655 | if (cl->level) |
| 656 | bstats_update(&cl->bstats, skb); |
| 657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | cl = cl->parent; |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | /** |
| 663 | * htb_do_events - make mode changes to classes at the level |
| 664 | * |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 665 | * Scans event queue for pending events and applies them. Returns time of |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 666 | * 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] | 667 | * Note: Applied are events whose have cl->pq_key <= q->now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | */ |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 669 | static psched_time_t htb_do_events(struct htb_sched *q, int level, |
| 670 | unsigned long start) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | { |
Martin Devera | 8f3ea33 | 2008-03-23 22:00:38 -0700 | [diff] [blame] | 672 | /* 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] | 673 | * 1 to simplify things when jiffy is going to be incremented |
| 674 | * too soon |
| 675 | */ |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 676 | unsigned long stop_at = start + 2; |
Martin Devera | 8f3ea33 | 2008-03-23 22:00:38 -0700 | [diff] [blame] | 677 | while (time_before(jiffies, stop_at)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | struct htb_class *cl; |
| 679 | long diff; |
Akinbou Mita | 30bdbe3 | 2006-10-12 01:52:05 -0700 | [diff] [blame] | 680 | struct rb_node *p = rb_first(&q->wait_pq[level]); |
| 681 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 682 | if (!p) |
| 683 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
| 685 | cl = rb_entry(p, struct htb_class, pq_node); |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 686 | if (cl->pq_key > q->now) |
| 687 | return cl->pq_key; |
| 688 | |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 689 | htb_safe_rb_erase(p, q->wait_pq + level); |
Patrick McHardy | 03cc45c | 2007-03-23 11:29:11 -0700 | [diff] [blame] | 690 | diff = psched_tdiff_bounded(q->now, cl->t_c, cl->mbuffer); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 691 | htb_change_class_mode(q, cl, &diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | if (cl->cmode != HTB_CAN_SEND) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 693 | htb_add_to_wait_tree(q, cl, diff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | } |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 695 | |
| 696 | /* too much load - let's continue after a break for scheduling */ |
Jarek Poplawski | e82181d | 2009-02-01 01:13:05 -0800 | [diff] [blame] | 697 | if (!(q->warned & HTB_WARN_TOOMANYEVENTS)) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 698 | pr_warning("htb: too many events!\n"); |
Jarek Poplawski | e82181d | 2009-02-01 01:13:05 -0800 | [diff] [blame] | 699 | q->warned |= HTB_WARN_TOOMANYEVENTS; |
| 700 | } |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 701 | |
| 702 | return q->now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | /* 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] | 706 | * is no such one exists. |
| 707 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 708 | static struct rb_node *htb_id_find_next_upper(int prio, struct rb_node *n, |
| 709 | u32 id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | { |
| 711 | struct rb_node *r = NULL; |
| 712 | while (n) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 713 | struct htb_class *cl = |
| 714 | rb_entry(n, struct htb_class, node[prio]); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 715 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 716 | if (id > cl->common.classid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | n = n->rb_right; |
Jarek Poplawski | 1b5c007 | 2008-12-09 22:34:40 -0800 | [diff] [blame] | 718 | } else if (id < cl->common.classid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | r = n; |
| 720 | n = n->rb_left; |
Jarek Poplawski | 1b5c007 | 2008-12-09 22:34:40 -0800 | [diff] [blame] | 721 | } else { |
| 722 | return n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | } |
| 724 | } |
| 725 | return r; |
| 726 | } |
| 727 | |
| 728 | /** |
| 729 | * htb_lookup_leaf - returns next leaf class in DRR order |
| 730 | * |
| 731 | * Find leaf where current feed pointers points to. |
| 732 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 733 | static struct htb_class *htb_lookup_leaf(struct rb_root *tree, int prio, |
| 734 | struct rb_node **pptr, u32 * pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | { |
| 736 | int i; |
| 737 | struct { |
| 738 | struct rb_node *root; |
| 739 | struct rb_node **pptr; |
| 740 | u32 *pid; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 741 | } stk[TC_HTB_MAXDEPTH], *sp = stk; |
| 742 | |
Jarek Poplawski | 512bb43 | 2008-12-09 22:35:02 -0800 | [diff] [blame] | 743 | BUG_ON(!tree->rb_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | sp->root = tree->rb_node; |
| 745 | sp->pptr = pptr; |
| 746 | sp->pid = pid; |
| 747 | |
| 748 | for (i = 0; i < 65535; i++) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 749 | if (!*sp->pptr && *sp->pid) { |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 750 | /* ptr was invalidated but id is valid - try to recover |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 751 | * the original or next ptr |
| 752 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 753 | *sp->pptr = |
| 754 | htb_id_find_next_upper(prio, sp->root, *sp->pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 756 | *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] | 757 | * can become out of date quickly |
| 758 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 759 | if (!*sp->pptr) { /* we are at right end; rewind & go up */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | *sp->pptr = sp->root; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 761 | while ((*sp->pptr)->rb_left) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | *sp->pptr = (*sp->pptr)->rb_left; |
| 763 | if (sp > stk) { |
| 764 | sp--; |
Jarek Poplawski | 512bb43 | 2008-12-09 22:35:02 -0800 | [diff] [blame] | 765 | if (!*sp->pptr) { |
| 766 | WARN_ON(1); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 767 | return NULL; |
Jarek Poplawski | 512bb43 | 2008-12-09 22:35:02 -0800 | [diff] [blame] | 768 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 769 | htb_next_rb_node(sp->pptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } |
| 771 | } else { |
| 772 | struct htb_class *cl; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 773 | cl = rb_entry(*sp->pptr, struct htb_class, node[prio]); |
| 774 | if (!cl->level) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | return cl; |
| 776 | (++sp)->root = cl->un.inner.feed[prio].rb_node; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 777 | sp->pptr = cl->un.inner.ptr + prio; |
| 778 | sp->pid = cl->un.inner.last_ptr_id + prio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | } |
| 780 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 781 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | return NULL; |
| 783 | } |
| 784 | |
| 785 | /* dequeues packet at given priority and level; call only if |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 786 | * you are sure that there is active class at prio/level |
| 787 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 788 | static struct sk_buff *htb_dequeue_tree(struct htb_sched *q, int prio, |
| 789 | int level) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
| 791 | struct sk_buff *skb = NULL; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 792 | struct htb_class *cl, *start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | /* look initial class up in the row */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 794 | start = cl = htb_lookup_leaf(q->row[level] + prio, prio, |
| 795 | q->ptr[level] + prio, |
| 796 | q->last_ptr_id[level] + prio); |
| 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | do { |
| 799 | next: |
Jarek Poplawski | 512bb43 | 2008-12-09 22:35:02 -0800 | [diff] [blame] | 800 | if (unlikely(!cl)) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 801 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
| 803 | /* 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] | 804 | * qdisc drops packets in enqueue routine or if someone used |
| 805 | * graft operation on the leaf since last dequeue; |
| 806 | * simply deactivate and skip such class |
| 807 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | if (unlikely(cl->un.leaf.q->q.qlen == 0)) { |
| 809 | struct htb_class *next; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 810 | htb_deactivate(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
| 812 | /* row/level might become empty */ |
| 813 | if ((q->row_mask[level] & (1 << prio)) == 0) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 814 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 816 | next = htb_lookup_leaf(q->row[level] + prio, |
| 817 | prio, q->ptr[level] + prio, |
| 818 | q->last_ptr_id[level] + prio); |
| 819 | |
| 820 | if (cl == start) /* fix start if we just deleted it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | start = next; |
| 822 | cl = next; |
| 823 | goto next; |
| 824 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 825 | |
| 826 | skb = cl->un.leaf.q->dequeue(cl->un.leaf.q); |
| 827 | if (likely(skb != NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | break; |
Jarek Poplawski | 633fe66 | 2008-12-03 21:09:10 -0800 | [diff] [blame] | 829 | |
Jarek Poplawski | b00355d | 2009-02-01 01:12:42 -0800 | [diff] [blame] | 830 | qdisc_warn_nonwc("htb", cl->un.leaf.q); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 831 | htb_next_rb_node((level ? cl->parent->un.inner.ptr : q-> |
| 832 | ptr[0]) + prio); |
| 833 | cl = htb_lookup_leaf(q->row[level] + prio, prio, |
| 834 | q->ptr[level] + prio, |
| 835 | q->last_ptr_id[level] + prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
| 837 | } while (cl != start); |
| 838 | |
| 839 | if (likely(skb != NULL)) { |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 840 | cl->un.leaf.deficit[level] -= qdisc_pkt_len(skb); |
| 841 | if (cl->un.leaf.deficit[level] < 0) { |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 842 | cl->un.leaf.deficit[level] += cl->quantum; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 843 | htb_next_rb_node((level ? cl->parent->un.inner.ptr : q-> |
| 844 | ptr[0]) + prio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
| 846 | /* this used to be after charge_class but this constelation |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 847 | * gives us slightly better performance |
| 848 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | if (!cl->un.leaf.q->q.qlen) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 850 | htb_deactivate(q, cl); |
Ranjit Manomohan | c9726d6 | 2007-07-10 22:43:16 -0700 | [diff] [blame] | 851 | htb_charge_class(q, cl, level, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
| 853 | return skb; |
| 854 | } |
| 855 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | static struct sk_buff *htb_dequeue(struct Qdisc *sch) |
| 857 | { |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 858 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | struct htb_sched *q = qdisc_priv(sch); |
| 860 | int level; |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 861 | psched_time_t next_event; |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 862 | unsigned long start_at; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | /* try to dequeue direct packets as high prio (!) to minimize cpu work */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 865 | skb = __skb_dequeue(&q->direct_queue); |
| 866 | if (skb != NULL) { |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 867 | ok: |
| 868 | qdisc_bstats_update(sch, skb); |
Eric Dumazet | fd245a4 | 2011-01-20 05:27:16 +0000 | [diff] [blame] | 869 | qdisc_unthrottled(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | sch->q.qlen--; |
| 871 | return skb; |
| 872 | } |
| 873 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 874 | if (!sch->q.qlen) |
| 875 | goto fin; |
Patrick McHardy | 3bebcda | 2007-03-23 11:29:25 -0700 | [diff] [blame] | 876 | q->now = psched_get_time(); |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 877 | start_at = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 879 | next_event = q->now + 5 * PSCHED_TICKS_PER_SEC; |
Jarek Poplawski | 633fe66 | 2008-12-03 21:09:10 -0800 | [diff] [blame] | 880 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | for (level = 0; level < TC_HTB_MAXDEPTH; level++) { |
| 882 | /* common case optimization - skip event handler quickly */ |
| 883 | int m; |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 884 | psched_time_t event; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 885 | |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 886 | if (q->now >= q->near_ev_cache[level]) { |
Jarek Poplawski | a73be04 | 2009-01-12 21:54:40 -0800 | [diff] [blame] | 887 | event = htb_do_events(q, level, start_at); |
Patrick McHardy | 2e4b3b0 | 2007-05-23 23:39:54 -0700 | [diff] [blame] | 888 | if (!event) |
| 889 | event = q->now + PSCHED_TICKS_PER_SEC; |
| 890 | q->near_ev_cache[level] = event; |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 891 | } else |
| 892 | event = q->near_ev_cache[level]; |
| 893 | |
Jarek Poplawski | c085134 | 2009-01-12 21:54:16 -0800 | [diff] [blame] | 894 | if (next_event > event) |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 895 | next_event = event; |
| 896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | m = ~q->row_mask[level]; |
| 898 | while (m != (int)(-1)) { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 899 | int prio = ffz(m); |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 900 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | m |= 1 << prio; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 902 | skb = htb_dequeue_tree(q, prio, level); |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 903 | if (likely(skb != NULL)) |
| 904 | goto ok; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | } |
| 906 | } |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 907 | sch->qstats.overlimits++; |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 908 | if (likely(next_event > q->now)) |
| 909 | qdisc_watchdog_schedule(&q->watchdog, next_event); |
| 910 | else |
| 911 | schedule_work(&q->work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | fin: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | return skb; |
| 914 | } |
| 915 | |
| 916 | /* try to drop from each class (by prio) until one succeed */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 917 | static unsigned int htb_drop(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | { |
| 919 | struct htb_sched *q = qdisc_priv(sch); |
| 920 | int prio; |
| 921 | |
| 922 | for (prio = TC_HTB_NUMPRIO - 1; prio >= 0; prio--) { |
| 923 | struct list_head *p; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 924 | list_for_each(p, q->drops + prio) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | struct htb_class *cl = list_entry(p, struct htb_class, |
| 926 | un.leaf.drop_list); |
| 927 | unsigned int len; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 928 | if (cl->un.leaf.q->ops->drop && |
| 929 | (len = cl->un.leaf.q->ops->drop(cl->un.leaf.q))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | sch->q.qlen--; |
| 931 | if (!cl->un.leaf.q->q.qlen) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 932 | htb_deactivate(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | return len; |
| 934 | } |
| 935 | } |
| 936 | } |
| 937 | return 0; |
| 938 | } |
| 939 | |
| 940 | /* reset all classes */ |
| 941 | /* always caled under BH & queue lock */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 942 | static void htb_reset(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | { |
| 944 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 945 | struct htb_class *cl; |
| 946 | struct hlist_node *n; |
| 947 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 949 | for (i = 0; i < q->clhash.hashsize; i++) { |
| 950 | hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | if (cl->level) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 952 | memset(&cl->un.inner, 0, sizeof(cl->un.inner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | else { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 954 | if (cl->un.leaf.q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | qdisc_reset(cl->un.leaf.q); |
| 956 | INIT_LIST_HEAD(&cl->un.leaf.drop_list); |
| 957 | } |
| 958 | cl->prio_activity = 0; |
| 959 | cl->cmode = HTB_CAN_SEND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
| 961 | } |
| 962 | } |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 963 | qdisc_watchdog_cancel(&q->watchdog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | __skb_queue_purge(&q->direct_queue); |
| 965 | sch->q.qlen = 0; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 966 | memset(q->row, 0, sizeof(q->row)); |
| 967 | memset(q->row_mask, 0, sizeof(q->row_mask)); |
| 968 | memset(q->wait_pq, 0, sizeof(q->wait_pq)); |
| 969 | memset(q->ptr, 0, sizeof(q->ptr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | for (i = 0; i < TC_HTB_NUMPRIO; i++) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 971 | INIT_LIST_HEAD(q->drops + i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 974 | static const struct nla_policy htb_policy[TCA_HTB_MAX + 1] = { |
| 975 | [TCA_HTB_PARMS] = { .len = sizeof(struct tc_htb_opt) }, |
| 976 | [TCA_HTB_INIT] = { .len = sizeof(struct tc_htb_glob) }, |
| 977 | [TCA_HTB_CTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, |
| 978 | [TCA_HTB_RTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, |
| 979 | }; |
| 980 | |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 981 | static void htb_work_func(struct work_struct *work) |
| 982 | { |
| 983 | struct htb_sched *q = container_of(work, struct htb_sched, work); |
| 984 | struct Qdisc *sch = q->watchdog.qdisc; |
| 985 | |
| 986 | __netif_schedule(qdisc_root(sch)); |
| 987 | } |
| 988 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 989 | static int htb_init(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | { |
| 991 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 992 | struct nlattr *tb[TCA_HTB_INIT + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | struct tc_htb_glob *gopt; |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 994 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | int i; |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 996 | |
| 997 | if (!opt) |
| 998 | return -EINVAL; |
| 999 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 1000 | err = nla_parse_nested(tb, TCA_HTB_INIT, opt, htb_policy); |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 1001 | if (err < 0) |
| 1002 | return err; |
| 1003 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 1004 | if (tb[TCA_HTB_INIT] == NULL) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1005 | pr_err("HTB: hey probably you have bad tc tool ?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | return -EINVAL; |
| 1007 | } |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1008 | gopt = nla_data(tb[TCA_HTB_INIT]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | if (gopt->version != HTB_VER >> 16) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1010 | pr_err("HTB: need tc/htb version %d (minor is %d), you have %d\n", |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1011 | HTB_VER >> 16, HTB_VER & 0xffff, gopt->version); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | return -EINVAL; |
| 1013 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1015 | err = qdisc_class_hash_init(&q->clhash); |
| 1016 | if (err < 0) |
| 1017 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | for (i = 0; i < TC_HTB_NUMPRIO; i++) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1019 | INIT_LIST_HEAD(q->drops + i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 1021 | qdisc_watchdog_init(&q->watchdog, sch); |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 1022 | INIT_WORK(&q->work, htb_work_func); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | skb_queue_head_init(&q->direct_queue); |
| 1024 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 1025 | q->direct_qlen = qdisc_dev(sch)->tx_queue_len; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1026 | if (q->direct_qlen < 2) /* some devices have zero tx_queue_len */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | q->direct_qlen = 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | if ((q->rate2quantum = gopt->rate2quantum) < 1) |
| 1030 | q->rate2quantum = 1; |
| 1031 | q->defcls = gopt->defcls; |
| 1032 | |
| 1033 | return 0; |
| 1034 | } |
| 1035 | |
| 1036 | static int htb_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 1037 | { |
Jarek Poplawski | 102396a | 2008-08-29 14:21:52 -0700 | [diff] [blame] | 1038 | spinlock_t *root_lock = qdisc_root_sleeping_lock(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1040 | struct nlattr *nest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | struct tc_htb_glob gopt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 1043 | spin_lock_bh(root_lock); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1044 | |
| 1045 | gopt.direct_pkts = q->direct_pkts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | gopt.version = HTB_VER; |
| 1047 | gopt.rate2quantum = q->rate2quantum; |
| 1048 | gopt.defcls = q->defcls; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1049 | gopt.debug = 0; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1050 | |
| 1051 | nest = nla_nest_start(skb, TCA_OPTIONS); |
| 1052 | if (nest == NULL) |
| 1053 | goto nla_put_failure; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1054 | NLA_PUT(skb, TCA_HTB_INIT, sizeof(gopt), &gopt); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1055 | nla_nest_end(skb, nest); |
| 1056 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 1057 | spin_unlock_bh(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | return skb->len; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1059 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1060 | nla_put_failure: |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 1061 | spin_unlock_bh(root_lock); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1062 | nla_nest_cancel(skb, nest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | return -1; |
| 1064 | } |
| 1065 | |
| 1066 | static int htb_dump_class(struct Qdisc *sch, unsigned long arg, |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1067 | struct sk_buff *skb, struct tcmsg *tcm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1069 | struct htb_class *cl = (struct htb_class *)arg; |
Jarek Poplawski | 102396a | 2008-08-29 14:21:52 -0700 | [diff] [blame] | 1070 | spinlock_t *root_lock = qdisc_root_sleeping_lock(sch); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1071 | struct nlattr *nest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | struct tc_htb_opt opt; |
| 1073 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 1074 | spin_lock_bh(root_lock); |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1075 | tcm->tcm_parent = cl->parent ? cl->parent->common.classid : TC_H_ROOT; |
| 1076 | tcm->tcm_handle = cl->common.classid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | if (!cl->level && cl->un.leaf.q) |
| 1078 | tcm->tcm_info = cl->un.leaf.q->handle; |
| 1079 | |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1080 | nest = nla_nest_start(skb, TCA_OPTIONS); |
| 1081 | if (nest == NULL) |
| 1082 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1084 | memset(&opt, 0, sizeof(opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1086 | opt.rate = cl->rate->rate; |
| 1087 | opt.buffer = cl->buffer; |
| 1088 | opt.ceil = cl->ceil->rate; |
| 1089 | opt.cbuffer = cl->cbuffer; |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1090 | opt.quantum = cl->quantum; |
| 1091 | opt.prio = cl->prio; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1092 | opt.level = cl->level; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1093 | NLA_PUT(skb, TCA_HTB_PARMS, sizeof(opt), &opt); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1094 | |
| 1095 | nla_nest_end(skb, nest); |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 1096 | spin_unlock_bh(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | return skb->len; |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1098 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1099 | nla_put_failure: |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 1100 | spin_unlock_bh(root_lock); |
Patrick McHardy | 4b3550ef | 2008-01-23 20:34:11 -0800 | [diff] [blame] | 1101 | nla_nest_cancel(skb, nest); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | return -1; |
| 1103 | } |
| 1104 | |
| 1105 | static int |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1106 | 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] | 1107 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1108 | struct htb_class *cl = (struct htb_class *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | if (!cl->level && cl->un.leaf.q) |
| 1111 | cl->qstats.qlen = cl->un.leaf.q->q.qlen; |
| 1112 | cl->xstats.tokens = cl->tokens; |
| 1113 | cl->xstats.ctokens = cl->ctokens; |
| 1114 | |
| 1115 | if (gnet_stats_copy_basic(d, &cl->bstats) < 0 || |
Eric Dumazet | d250a5f | 2009-10-02 10:32:18 +0000 | [diff] [blame] | 1116 | gnet_stats_copy_rate_est(d, NULL, &cl->rate_est) < 0 || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | gnet_stats_copy_queue(d, &cl->qstats) < 0) |
| 1118 | return -1; |
| 1119 | |
| 1120 | return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats)); |
| 1121 | } |
| 1122 | |
| 1123 | 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] | 1124 | struct Qdisc **old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1126 | struct htb_class *cl = (struct htb_class *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | |
Patrick McHardy | 5b9a9cc | 2009-09-04 06:41:17 +0000 | [diff] [blame] | 1128 | if (cl->level) |
| 1129 | return -EINVAL; |
| 1130 | if (new == NULL && |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 1131 | (new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, |
Patrick McHardy | 5b9a9cc | 2009-09-04 06:41:17 +0000 | [diff] [blame] | 1132 | cl->common.classid)) == NULL) |
| 1133 | return -ENOBUFS; |
| 1134 | |
| 1135 | sch_tree_lock(sch); |
| 1136 | *old = cl->un.leaf.q; |
| 1137 | cl->un.leaf.q = new; |
| 1138 | if (*old != NULL) { |
| 1139 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
| 1140 | qdisc_reset(*old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | } |
Patrick McHardy | 5b9a9cc | 2009-09-04 06:41:17 +0000 | [diff] [blame] | 1142 | sch_tree_unlock(sch); |
| 1143 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | } |
| 1145 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1146 | static struct Qdisc *htb_leaf(struct Qdisc *sch, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1148 | struct htb_class *cl = (struct htb_class *)arg; |
Patrick McHardy | 5b9a9cc | 2009-09-04 06:41:17 +0000 | [diff] [blame] | 1149 | return !cl->level ? cl->un.leaf.q : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | } |
| 1151 | |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1152 | static void htb_qlen_notify(struct Qdisc *sch, unsigned long arg) |
| 1153 | { |
| 1154 | struct htb_class *cl = (struct htb_class *)arg; |
| 1155 | |
| 1156 | if (cl->un.leaf.q->q.qlen == 0) |
| 1157 | htb_deactivate(qdisc_priv(sch), cl); |
| 1158 | } |
| 1159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | static unsigned long htb_get(struct Qdisc *sch, u32 classid) |
| 1161 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1162 | struct htb_class *cl = htb_find(classid, sch); |
| 1163 | if (cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | cl->refcnt++; |
| 1165 | return (unsigned long)cl; |
| 1166 | } |
| 1167 | |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1168 | static inline int htb_parent_last_child(struct htb_class *cl) |
| 1169 | { |
| 1170 | if (!cl->parent) |
| 1171 | /* the root class */ |
| 1172 | return 0; |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 1173 | if (cl->parent->children > 1) |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1174 | /* not the last child */ |
| 1175 | return 0; |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1176 | return 1; |
| 1177 | } |
| 1178 | |
Jarek Poplawski | 3ba08b0 | 2008-05-03 20:46:29 -0700 | [diff] [blame] | 1179 | static void htb_parent_to_leaf(struct htb_sched *q, struct htb_class *cl, |
| 1180 | struct Qdisc *new_q) |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1181 | { |
| 1182 | struct htb_class *parent = cl->parent; |
| 1183 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1184 | WARN_ON(cl->level || !cl->un.leaf.q || cl->prio_activity); |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1185 | |
Jarek Poplawski | 3ba08b0 | 2008-05-03 20:46:29 -0700 | [diff] [blame] | 1186 | if (parent->cmode != HTB_CAN_SEND) |
| 1187 | htb_safe_rb_erase(&parent->pq_node, q->wait_pq + parent->level); |
| 1188 | |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1189 | parent->level = 0; |
| 1190 | memset(&parent->un.inner, 0, sizeof(parent->un.inner)); |
| 1191 | INIT_LIST_HEAD(&parent->un.leaf.drop_list); |
| 1192 | parent->un.leaf.q = new_q ? new_q : &noop_qdisc; |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1193 | parent->tokens = parent->buffer; |
| 1194 | parent->ctokens = parent->cbuffer; |
Patrick McHardy | 3bebcda | 2007-03-23 11:29:25 -0700 | [diff] [blame] | 1195 | parent->t_c = psched_get_time(); |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1196 | parent->cmode = HTB_CAN_SEND; |
| 1197 | } |
| 1198 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1199 | static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | if (!cl->level) { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1202 | WARN_ON(!cl->un.leaf.q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | qdisc_destroy(cl->un.leaf.q); |
| 1204 | } |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1205 | gen_kill_estimator(&cl->bstats, &cl->rate_est); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | qdisc_put_rtab(cl->rate); |
| 1207 | qdisc_put_rtab(cl->ceil); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1208 | |
Patrick McHardy | ff31ab5 | 2008-07-01 19:52:38 -0700 | [diff] [blame] | 1209 | tcf_destroy_chain(&cl->filter_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | kfree(cl); |
| 1211 | } |
| 1212 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1213 | static void htb_destroy(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | { |
| 1215 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1216 | struct hlist_node *n, *next; |
| 1217 | struct htb_class *cl; |
| 1218 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | |
Jarek Poplawski | 1224736 | 2009-02-01 01:13:22 -0800 | [diff] [blame] | 1220 | cancel_work_sync(&q->work); |
Patrick McHardy | fb983d4 | 2007-03-16 01:22:39 -0700 | [diff] [blame] | 1221 | qdisc_watchdog_cancel(&q->watchdog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | /* This line used to be after htb_destroy_class call below |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1223 | * and surprisingly it worked in 2.4. But it must precede it |
| 1224 | * because filter need its target class alive to be able to call |
| 1225 | * unbind_filter on it (without Oops). |
| 1226 | */ |
Patrick McHardy | ff31ab5 | 2008-07-01 19:52:38 -0700 | [diff] [blame] | 1227 | tcf_destroy_chain(&q->filter_list); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1228 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1229 | for (i = 0; i < q->clhash.hashsize; i++) { |
| 1230 | hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1231 | tcf_destroy_chain(&cl->filter_list); |
| 1232 | } |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1233 | for (i = 0; i < q->clhash.hashsize; i++) { |
| 1234 | hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[i], |
| 1235 | common.hnode) |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1236 | htb_destroy_class(sch, cl); |
| 1237 | } |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1238 | qdisc_class_hash_destroy(&q->clhash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | __skb_queue_purge(&q->direct_queue); |
| 1240 | } |
| 1241 | |
| 1242 | static int htb_delete(struct Qdisc *sch, unsigned long arg) |
| 1243 | { |
| 1244 | struct htb_sched *q = qdisc_priv(sch); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1245 | struct htb_class *cl = (struct htb_class *)arg; |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1246 | unsigned int qlen; |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1247 | struct Qdisc *new_q = NULL; |
| 1248 | int last_child = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
| 1250 | // TODO: why don't allow to delete subtree ? references ? does |
| 1251 | // tc subsys quarantee us that in htb_destroy it holds no class |
| 1252 | // refs so that we can remove children safely there ? |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 1253 | if (cl->children || cl->filter_cnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | return -EBUSY; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1255 | |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1256 | if (!cl->level && htb_parent_last_child(cl)) { |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 1257 | new_q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 1258 | cl->parent->common.classid); |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1259 | last_child = 1; |
| 1260 | } |
| 1261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | sch_tree_lock(sch); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1263 | |
Patrick McHardy | 814a175e | 2006-11-29 17:34:50 -0800 | [diff] [blame] | 1264 | if (!cl->level) { |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1265 | qlen = cl->un.leaf.q->q.qlen; |
Patrick McHardy | 814a175e | 2006-11-29 17:34:50 -0800 | [diff] [blame] | 1266 | qdisc_reset(cl->un.leaf.q); |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1267 | qdisc_tree_decrease_qlen(cl->un.leaf.q, qlen); |
Patrick McHardy | 814a175e | 2006-11-29 17:34:50 -0800 | [diff] [blame] | 1268 | } |
| 1269 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1270 | /* delete from hash and active; remainder in destroy_class */ |
| 1271 | qdisc_class_hash_remove(&q->clhash, &cl->common); |
Jarek Poplawski | 26b284d | 2008-08-13 15:16:43 -0700 | [diff] [blame] | 1272 | if (cl->parent) |
| 1273 | cl->parent->children--; |
Patrick McHardy | c38c83c | 2007-03-27 14:04:24 -0700 | [diff] [blame] | 1274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | if (cl->prio_activity) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1276 | htb_deactivate(q, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | |
Patrick McHardy | fbd8f13 | 2008-07-05 23:22:19 -0700 | [diff] [blame] | 1278 | if (cl->cmode != HTB_CAN_SEND) |
| 1279 | htb_safe_rb_erase(&cl->pq_node, q->wait_pq + cl->level); |
| 1280 | |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1281 | if (last_child) |
Jarek Poplawski | 3ba08b0 | 2008-05-03 20:46:29 -0700 | [diff] [blame] | 1282 | htb_parent_to_leaf(q, cl, new_q); |
Jarek Poplawski | 160d5e1 | 2006-12-08 00:26:56 -0800 | [diff] [blame] | 1283 | |
Jarek Poplawski | 7cd0a63 | 2009-03-15 20:00:19 -0700 | [diff] [blame] | 1284 | BUG_ON(--cl->refcnt == 0); |
| 1285 | /* |
| 1286 | * This shouldn't happen: we "hold" one cops->get() when called |
| 1287 | * from tc_ctl_tclass; the destroy method is done from cops->put(). |
| 1288 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
| 1290 | sch_tree_unlock(sch); |
| 1291 | return 0; |
| 1292 | } |
| 1293 | |
| 1294 | static void htb_put(struct Qdisc *sch, unsigned long arg) |
| 1295 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1296 | struct htb_class *cl = (struct htb_class *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | |
| 1298 | if (--cl->refcnt == 0) |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1299 | htb_destroy_class(sch, cl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | } |
| 1301 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1302 | static int htb_change_class(struct Qdisc *sch, u32 classid, |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1303 | u32 parentid, struct nlattr **tca, |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1304 | unsigned long *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | { |
| 1306 | int err = -EINVAL; |
| 1307 | struct htb_sched *q = qdisc_priv(sch); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1308 | struct htb_class *cl = (struct htb_class *)*arg, *parent; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1309 | struct nlattr *opt = tca[TCA_OPTIONS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | struct qdisc_rate_table *rtab = NULL, *ctab = NULL; |
Changli Gao | e18434c | 2010-09-30 06:17:44 +0000 | [diff] [blame] | 1311 | struct nlattr *tb[__TCA_HTB_MAX]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | struct tc_htb_opt *hopt; |
| 1313 | |
| 1314 | /* extract all subattrs from opt attr */ |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 1315 | if (!opt) |
| 1316 | goto failure; |
| 1317 | |
Changli Gao | e18434c | 2010-09-30 06:17:44 +0000 | [diff] [blame] | 1318 | err = nla_parse_nested(tb, TCA_HTB_MAX, opt, htb_policy); |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 1319 | if (err < 0) |
| 1320 | goto failure; |
| 1321 | |
| 1322 | err = -EINVAL; |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 1323 | if (tb[TCA_HTB_PARMS] == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | goto failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1326 | parent = parentid == TC_H_ROOT ? NULL : htb_find(parentid, sch); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1327 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1328 | hopt = nla_data(tb[TCA_HTB_PARMS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1330 | rtab = qdisc_get_rtab(&hopt->rate, tb[TCA_HTB_RTAB]); |
| 1331 | ctab = qdisc_get_rtab(&hopt->ceil, tb[TCA_HTB_CTAB]); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1332 | if (!rtab || !ctab) |
| 1333 | goto failure; |
| 1334 | |
| 1335 | if (!cl) { /* new class */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | struct Qdisc *new_q; |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 1337 | int prio; |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1338 | struct { |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1339 | struct nlattr nla; |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1340 | struct gnet_estimator opt; |
| 1341 | } est = { |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1342 | .nla = { |
| 1343 | .nla_len = nla_attr_size(sizeof(est.opt)), |
| 1344 | .nla_type = TCA_RATE, |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1345 | }, |
| 1346 | .opt = { |
| 1347 | /* 4s interval, 16s averaging constant */ |
| 1348 | .interval = 2, |
| 1349 | .ewma_log = 2, |
| 1350 | }, |
| 1351 | }; |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 1352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | /* check for valid classid */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1354 | if (!classid || TC_H_MAJ(classid ^ sch->handle) || |
| 1355 | htb_find(classid, sch)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | goto failure; |
| 1357 | |
| 1358 | /* check maximal depth */ |
| 1359 | if (parent && parent->parent && parent->parent->level < 2) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1360 | pr_err("htb: tree is too deep\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | goto failure; |
| 1362 | } |
| 1363 | err = -ENOBUFS; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1364 | cl = kzalloc(sizeof(*cl), GFP_KERNEL); |
| 1365 | if (!cl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | goto failure; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1367 | |
Stephen Hemminger | 71bcb09 | 2008-11-25 21:13:31 -0800 | [diff] [blame] | 1368 | err = gen_new_estimator(&cl->bstats, &cl->rate_est, |
| 1369 | qdisc_root_sleeping_lock(sch), |
| 1370 | tca[TCA_RATE] ? : &est.nla); |
| 1371 | if (err) { |
| 1372 | kfree(cl); |
| 1373 | goto failure; |
| 1374 | } |
| 1375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | cl->refcnt = 1; |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 1377 | cl->children = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | INIT_LIST_HEAD(&cl->un.leaf.drop_list); |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 1379 | RB_CLEAR_NODE(&cl->pq_node); |
| 1380 | |
| 1381 | for (prio = 0; prio < TC_HTB_NUMPRIO; prio++) |
| 1382 | RB_CLEAR_NODE(&cl->node[prio]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | |
| 1384 | /* create leaf qdisc early because it uses kmalloc(GFP_KERNEL) |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1385 | * so that can't be used inside of sch_tree_lock |
| 1386 | * -- thanks to Karlis Peisenieks |
| 1387 | */ |
Changli Gao | 3511c91 | 2010-10-16 13:04:08 +0000 | [diff] [blame] | 1388 | new_q = qdisc_create_dflt(sch->dev_queue, |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 1389 | &pfifo_qdisc_ops, classid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | sch_tree_lock(sch); |
| 1391 | if (parent && !parent->level) { |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1392 | unsigned int qlen = parent->un.leaf.q->q.qlen; |
| 1393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | /* turn parent into inner node */ |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1395 | qdisc_reset(parent->un.leaf.q); |
| 1396 | qdisc_tree_decrease_qlen(parent->un.leaf.q, qlen); |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1397 | qdisc_destroy(parent->un.leaf.q); |
| 1398 | if (parent->prio_activity) |
| 1399 | htb_deactivate(q, parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
| 1401 | /* remove from evt list because of level change */ |
| 1402 | if (parent->cmode != HTB_CAN_SEND) { |
Stephen Hemminger | 3696f62 | 2006-08-10 23:36:01 -0700 | [diff] [blame] | 1403 | htb_safe_rb_erase(&parent->pq_node, q->wait_pq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | parent->cmode = HTB_CAN_SEND; |
| 1405 | } |
| 1406 | parent->level = (parent->parent ? parent->parent->level |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1407 | : TC_HTB_MAXDEPTH) - 1; |
| 1408 | memset(&parent->un.inner, 0, sizeof(parent->un.inner)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | } |
| 1410 | /* leaf (we) needs elementary qdisc */ |
| 1411 | cl->un.leaf.q = new_q ? new_q : &noop_qdisc; |
| 1412 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1413 | cl->common.classid = classid; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1414 | cl->parent = parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
| 1416 | /* set class to be in HTB_CAN_SEND state */ |
| 1417 | cl->tokens = hopt->buffer; |
| 1418 | cl->ctokens = hopt->cbuffer; |
Patrick McHardy | 00c04af | 2007-03-16 01:23:02 -0700 | [diff] [blame] | 1419 | cl->mbuffer = 60 * PSCHED_TICKS_PER_SEC; /* 1min */ |
Patrick McHardy | 3bebcda | 2007-03-23 11:29:25 -0700 | [diff] [blame] | 1420 | cl->t_c = psched_get_time(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | cl->cmode = HTB_CAN_SEND; |
| 1422 | |
| 1423 | /* attach to the hash list and parent's family */ |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1424 | qdisc_class_hash_insert(&q->clhash, &cl->common); |
Patrick McHardy | 4207759 | 2008-07-05 23:22:53 -0700 | [diff] [blame] | 1425 | if (parent) |
| 1426 | parent->children++; |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1427 | } else { |
Stephen Hemminger | 71bcb09 | 2008-11-25 21:13:31 -0800 | [diff] [blame] | 1428 | if (tca[TCA_RATE]) { |
| 1429 | err = gen_replace_estimator(&cl->bstats, &cl->rate_est, |
| 1430 | qdisc_root_sleeping_lock(sch), |
| 1431 | tca[TCA_RATE]); |
| 1432 | if (err) |
| 1433 | return err; |
| 1434 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1435 | sch_tree_lock(sch); |
Patrick McHardy | ee39e10 | 2007-07-02 22:48:13 -0700 | [diff] [blame] | 1436 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
| 1438 | /* 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] | 1439 | * is really leaf before changing cl->un.leaf ! |
| 1440 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | if (!cl->level) { |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1442 | cl->quantum = rtab->rate.rate / q->rate2quantum; |
| 1443 | if (!hopt->quantum && cl->quantum < 1000) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1444 | pr_warning( |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1445 | "HTB: quantum of class %X is small. Consider r2q change.\n", |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1446 | cl->common.classid); |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1447 | cl->quantum = 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | } |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1449 | if (!hopt->quantum && cl->quantum > 200000) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1450 | pr_warning( |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1451 | "HTB: quantum of class %X is big. Consider r2q change.\n", |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1452 | cl->common.classid); |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1453 | cl->quantum = 200000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | } |
| 1455 | if (hopt->quantum) |
Jarek Poplawski | c19f7a3 | 2008-12-03 21:09:45 -0800 | [diff] [blame] | 1456 | cl->quantum = hopt->quantum; |
| 1457 | if ((cl->prio = hopt->prio) >= TC_HTB_NUMPRIO) |
| 1458 | cl->prio = TC_HTB_NUMPRIO - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | } |
| 1460 | |
| 1461 | cl->buffer = hopt->buffer; |
| 1462 | cl->cbuffer = hopt->cbuffer; |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1463 | if (cl->rate) |
| 1464 | qdisc_put_rtab(cl->rate); |
| 1465 | cl->rate = rtab; |
| 1466 | if (cl->ceil) |
| 1467 | qdisc_put_rtab(cl->ceil); |
| 1468 | cl->ceil = ctab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | sch_tree_unlock(sch); |
| 1470 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1471 | qdisc_class_hash_grow(sch, &q->clhash); |
| 1472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | *arg = (unsigned long)cl; |
| 1474 | return 0; |
| 1475 | |
| 1476 | failure: |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1477 | if (rtab) |
| 1478 | qdisc_put_rtab(rtab); |
| 1479 | if (ctab) |
| 1480 | qdisc_put_rtab(ctab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | return err; |
| 1482 | } |
| 1483 | |
| 1484 | static struct tcf_proto **htb_find_tcf(struct Qdisc *sch, unsigned long arg) |
| 1485 | { |
| 1486 | struct htb_sched *q = qdisc_priv(sch); |
| 1487 | struct htb_class *cl = (struct htb_class *)arg; |
| 1488 | struct tcf_proto **fl = cl ? &cl->filter_list : &q->filter_list; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | return fl; |
| 1491 | } |
| 1492 | |
| 1493 | static unsigned long htb_bind_filter(struct Qdisc *sch, unsigned long parent, |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1494 | u32 classid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1496 | struct htb_class *cl = htb_find(classid, sch); |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | /*if (cl && !cl->level) return 0; |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 1499 | * The line above used to be there to prevent attaching filters to |
| 1500 | * leaves. But at least tc_index filter uses this just to get class |
| 1501 | * for other reasons so that we have to allow for it. |
| 1502 | * ---- |
| 1503 | * 19.6.2002 As Werner explained it is ok - bind filter is just |
| 1504 | * another way to "lock" the class - unlike "get" this lock can |
| 1505 | * be broken by class during destroy IIUC. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | */ |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1507 | if (cl) |
| 1508 | cl->filter_cnt++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | return (unsigned long)cl; |
| 1510 | } |
| 1511 | |
| 1512 | static void htb_unbind_filter(struct Qdisc *sch, unsigned long arg) |
| 1513 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | struct htb_class *cl = (struct htb_class *)arg; |
Stephen Hemminger | 3bf7295 | 2006-08-10 23:31:08 -0700 | [diff] [blame] | 1515 | |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1516 | if (cl) |
| 1517 | cl->filter_cnt--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | } |
| 1519 | |
| 1520 | static void htb_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
| 1521 | { |
| 1522 | struct htb_sched *q = qdisc_priv(sch); |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1523 | struct htb_class *cl; |
| 1524 | struct hlist_node *n; |
| 1525 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | |
| 1527 | if (arg->stop) |
| 1528 | return; |
| 1529 | |
Patrick McHardy | f4c1f3e | 2008-07-05 23:22:35 -0700 | [diff] [blame] | 1530 | for (i = 0; i < q->clhash.hashsize; i++) { |
| 1531 | hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | if (arg->count < arg->skip) { |
| 1533 | arg->count++; |
| 1534 | continue; |
| 1535 | } |
| 1536 | if (arg->fn(sch, (unsigned long)cl, arg) < 0) { |
| 1537 | arg->stop = 1; |
| 1538 | return; |
| 1539 | } |
| 1540 | arg->count++; |
| 1541 | } |
| 1542 | } |
| 1543 | } |
| 1544 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1545 | static const struct Qdisc_class_ops htb_class_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | .graft = htb_graft, |
| 1547 | .leaf = htb_leaf, |
Patrick McHardy | 256d61b | 2006-11-29 17:37:05 -0800 | [diff] [blame] | 1548 | .qlen_notify = htb_qlen_notify, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | .get = htb_get, |
| 1550 | .put = htb_put, |
| 1551 | .change = htb_change_class, |
| 1552 | .delete = htb_delete, |
| 1553 | .walk = htb_walk, |
| 1554 | .tcf_chain = htb_find_tcf, |
| 1555 | .bind_tcf = htb_bind_filter, |
| 1556 | .unbind_tcf = htb_unbind_filter, |
| 1557 | .dump = htb_dump_class, |
| 1558 | .dump_stats = htb_dump_class_stats, |
| 1559 | }; |
| 1560 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1561 | static struct Qdisc_ops htb_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | .cl_ops = &htb_class_ops, |
| 1563 | .id = "htb", |
| 1564 | .priv_size = sizeof(struct htb_sched), |
| 1565 | .enqueue = htb_enqueue, |
| 1566 | .dequeue = htb_dequeue, |
Jarek Poplawski | 77be155 | 2008-10-31 00:47:01 -0700 | [diff] [blame] | 1567 | .peek = qdisc_peek_dequeued, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | .drop = htb_drop, |
| 1569 | .init = htb_init, |
| 1570 | .reset = htb_reset, |
| 1571 | .destroy = htb_destroy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | .dump = htb_dump, |
| 1573 | .owner = THIS_MODULE, |
| 1574 | }; |
| 1575 | |
| 1576 | static int __init htb_module_init(void) |
| 1577 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1578 | return register_qdisc(&htb_qdisc_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1580 | static void __exit htb_module_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | { |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1582 | unregister_qdisc(&htb_qdisc_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | } |
Stephen Hemminger | 8799046 | 2006-08-10 23:35:16 -0700 | [diff] [blame] | 1584 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | module_init(htb_module_init) |
| 1586 | module_exit(htb_module_exit) |
| 1587 | MODULE_LICENSE("GPL"); |