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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_sfq.c Stochastic Fairness Queueing discipline. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | */ | |
11 | ||
1da177e4 | 12 | #include <linux/module.h> |
1da177e4 LT |
13 | #include <linux/types.h> |
14 | #include <linux/kernel.h> | |
15 | #include <linux/jiffies.h> | |
16 | #include <linux/string.h> | |
1da177e4 LT |
17 | #include <linux/in.h> |
18 | #include <linux/errno.h> | |
1da177e4 | 19 | #include <linux/init.h> |
1da177e4 | 20 | #include <linux/ipv6.h> |
1da177e4 | 21 | #include <linux/skbuff.h> |
32740ddc | 22 | #include <linux/jhash.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
0ba48053 PM |
24 | #include <net/ip.h> |
25 | #include <net/netlink.h> | |
1da177e4 LT |
26 | #include <net/pkt_sched.h> |
27 | ||
28 | ||
29 | /* Stochastic Fairness Queuing algorithm. | |
30 | ======================================= | |
31 | ||
32 | Source: | |
33 | Paul E. McKenney "Stochastic Fairness Queuing", | |
34 | IEEE INFOCOMM'90 Proceedings, San Francisco, 1990. | |
35 | ||
36 | Paul E. McKenney "Stochastic Fairness Queuing", | |
37 | "Interworking: Research and Experience", v.2, 1991, p.113-131. | |
38 | ||
39 | ||
40 | See also: | |
41 | M. Shreedhar and George Varghese "Efficient Fair | |
42 | Queuing using Deficit Round Robin", Proc. SIGCOMM 95. | |
43 | ||
44 | ||
10297b99 | 45 | This is not the thing that is usually called (W)FQ nowadays. |
1da177e4 LT |
46 | It does not use any timestamp mechanism, but instead |
47 | processes queues in round-robin order. | |
48 | ||
49 | ADVANTAGE: | |
50 | ||
51 | - It is very cheap. Both CPU and memory requirements are minimal. | |
52 | ||
53 | DRAWBACKS: | |
54 | ||
10297b99 | 55 | - "Stochastic" -> It is not 100% fair. |
1da177e4 LT |
56 | When hash collisions occur, several flows are considered as one. |
57 | ||
58 | - "Round-robin" -> It introduces larger delays than virtual clock | |
59 | based schemes, and should not be used for isolating interactive | |
60 | traffic from non-interactive. It means, that this scheduler | |
61 | should be used as leaf of CBQ or P3, which put interactive traffic | |
62 | to higher priority band. | |
63 | ||
64 | We still need true WFQ for top level CSZ, but using WFQ | |
65 | for the best effort traffic is absolutely pointless: | |
66 | SFQ is superior for this purpose. | |
67 | ||
68 | IMPLEMENTATION: | |
69 | This implementation limits maximal queue length to 128; | |
70 | maximal mtu to 2^15-1; number of hash buckets to 1024. | |
71 | The only goal of this restrictions was that all data | |
72 | fit into one 4K page :-). Struct sfq_sched_data is | |
73 | organized in anti-cache manner: all the data for a bucket | |
74 | are scattered over different locations. This is not good, | |
75 | but it allowed me to put it into 4K. | |
76 | ||
77 | It is easy to increase these values, but not in flight. */ | |
78 | ||
79 | #define SFQ_DEPTH 128 | |
80 | #define SFQ_HASH_DIVISOR 1024 | |
81 | ||
82 | /* This type should contain at least SFQ_DEPTH*2 values */ | |
83 | typedef unsigned char sfq_index; | |
84 | ||
85 | struct sfq_head | |
86 | { | |
87 | sfq_index next; | |
88 | sfq_index prev; | |
89 | }; | |
90 | ||
91 | struct sfq_sched_data | |
92 | { | |
93 | /* Parameters */ | |
94 | int perturb_period; | |
95 | unsigned quantum; /* Allotment per round: MUST BE >= MTU */ | |
96 | int limit; | |
97 | ||
98 | /* Variables */ | |
7d2681a6 | 99 | struct tcf_proto *filter_list; |
1da177e4 | 100 | struct timer_list perturb_timer; |
32740ddc | 101 | u32 perturbation; |
1da177e4 LT |
102 | sfq_index tail; /* Index of current slot in round */ |
103 | sfq_index max_depth; /* Maximal depth */ | |
104 | ||
105 | sfq_index ht[SFQ_HASH_DIVISOR]; /* Hash table */ | |
106 | sfq_index next[SFQ_DEPTH]; /* Active slots link */ | |
107 | short allot[SFQ_DEPTH]; /* Current allotment per slot */ | |
108 | unsigned short hash[SFQ_DEPTH]; /* Hash value indexed by slots */ | |
109 | struct sk_buff_head qs[SFQ_DEPTH]; /* Slot queue */ | |
110 | struct sfq_head dep[SFQ_DEPTH*2]; /* Linked list of slots, indexed by depth */ | |
111 | }; | |
112 | ||
113 | static __inline__ unsigned sfq_fold_hash(struct sfq_sched_data *q, u32 h, u32 h1) | |
114 | { | |
32740ddc | 115 | return jhash_2words(h, h1, q->perturbation) & (SFQ_HASH_DIVISOR - 1); |
1da177e4 LT |
116 | } |
117 | ||
118 | static unsigned sfq_hash(struct sfq_sched_data *q, struct sk_buff *skb) | |
119 | { | |
120 | u32 h, h2; | |
121 | ||
122 | switch (skb->protocol) { | |
60678040 | 123 | case htons(ETH_P_IP): |
1da177e4 | 124 | { |
f2f00981 | 125 | const struct iphdr *iph; |
b9959c2e | 126 | int poff; |
f2f00981 CG |
127 | |
128 | if (!pskb_network_may_pull(skb, sizeof(*iph))) | |
129 | goto err; | |
130 | iph = ip_hdr(skb); | |
0eae88f3 ED |
131 | h = (__force u32)iph->daddr; |
132 | h2 = (__force u32)iph->saddr ^ iph->protocol; | |
b9959c2e CG |
133 | if (iph->frag_off & htons(IP_MF|IP_OFFSET)) |
134 | break; | |
135 | poff = proto_ports_offset(iph->protocol); | |
136 | if (poff >= 0 && | |
137 | pskb_network_may_pull(skb, iph->ihl * 4 + 4 + poff)) { | |
138 | iph = ip_hdr(skb); | |
139 | h2 ^= *(u32*)((void *)iph + iph->ihl * 4 + poff); | |
140 | } | |
1da177e4 LT |
141 | break; |
142 | } | |
60678040 | 143 | case htons(ETH_P_IPV6): |
1da177e4 | 144 | { |
f2f00981 | 145 | struct ipv6hdr *iph; |
b9959c2e | 146 | int poff; |
f2f00981 CG |
147 | |
148 | if (!pskb_network_may_pull(skb, sizeof(*iph))) | |
149 | goto err; | |
150 | iph = ipv6_hdr(skb); | |
0eae88f3 ED |
151 | h = (__force u32)iph->daddr.s6_addr32[3]; |
152 | h2 = (__force u32)iph->saddr.s6_addr32[3] ^ iph->nexthdr; | |
b9959c2e CG |
153 | poff = proto_ports_offset(iph->nexthdr); |
154 | if (poff >= 0 && | |
155 | pskb_network_may_pull(skb, sizeof(*iph) + 4 + poff)) { | |
156 | iph = ipv6_hdr(skb); | |
157 | h2 ^= *(u32*)((void *)iph + sizeof(*iph) + poff); | |
158 | } | |
1da177e4 LT |
159 | break; |
160 | } | |
161 | default: | |
f2f00981 | 162 | err: |
0eae88f3 | 163 | h = (unsigned long)skb_dst(skb) ^ (__force u32)skb->protocol; |
6f9e98f7 | 164 | h2 = (unsigned long)skb->sk; |
1da177e4 | 165 | } |
6f9e98f7 | 166 | |
1da177e4 LT |
167 | return sfq_fold_hash(q, h, h2); |
168 | } | |
169 | ||
7d2681a6 PM |
170 | static unsigned int sfq_classify(struct sk_buff *skb, struct Qdisc *sch, |
171 | int *qerr) | |
172 | { | |
173 | struct sfq_sched_data *q = qdisc_priv(sch); | |
174 | struct tcf_result res; | |
175 | int result; | |
176 | ||
177 | if (TC_H_MAJ(skb->priority) == sch->handle && | |
178 | TC_H_MIN(skb->priority) > 0 && | |
179 | TC_H_MIN(skb->priority) <= SFQ_HASH_DIVISOR) | |
180 | return TC_H_MIN(skb->priority); | |
181 | ||
182 | if (!q->filter_list) | |
183 | return sfq_hash(q, skb) + 1; | |
184 | ||
c27f339a | 185 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
7d2681a6 PM |
186 | result = tc_classify(skb, q->filter_list, &res); |
187 | if (result >= 0) { | |
188 | #ifdef CONFIG_NET_CLS_ACT | |
189 | switch (result) { | |
190 | case TC_ACT_STOLEN: | |
191 | case TC_ACT_QUEUED: | |
378a2f09 | 192 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
7d2681a6 PM |
193 | case TC_ACT_SHOT: |
194 | return 0; | |
195 | } | |
196 | #endif | |
197 | if (TC_H_MIN(res.classid) <= SFQ_HASH_DIVISOR) | |
198 | return TC_H_MIN(res.classid); | |
199 | } | |
200 | return 0; | |
201 | } | |
202 | ||
1da177e4 LT |
203 | static inline void sfq_link(struct sfq_sched_data *q, sfq_index x) |
204 | { | |
205 | sfq_index p, n; | |
206 | int d = q->qs[x].qlen + SFQ_DEPTH; | |
207 | ||
208 | p = d; | |
209 | n = q->dep[d].next; | |
210 | q->dep[x].next = n; | |
211 | q->dep[x].prev = p; | |
212 | q->dep[p].next = q->dep[n].prev = x; | |
213 | } | |
214 | ||
215 | static inline void sfq_dec(struct sfq_sched_data *q, sfq_index x) | |
216 | { | |
217 | sfq_index p, n; | |
218 | ||
219 | n = q->dep[x].next; | |
220 | p = q->dep[x].prev; | |
221 | q->dep[p].next = n; | |
222 | q->dep[n].prev = p; | |
223 | ||
224 | if (n == p && q->max_depth == q->qs[x].qlen + 1) | |
225 | q->max_depth--; | |
226 | ||
227 | sfq_link(q, x); | |
228 | } | |
229 | ||
230 | static inline void sfq_inc(struct sfq_sched_data *q, sfq_index x) | |
231 | { | |
232 | sfq_index p, n; | |
233 | int d; | |
234 | ||
235 | n = q->dep[x].next; | |
236 | p = q->dep[x].prev; | |
237 | q->dep[p].next = n; | |
238 | q->dep[n].prev = p; | |
239 | d = q->qs[x].qlen; | |
240 | if (q->max_depth < d) | |
241 | q->max_depth = d; | |
242 | ||
243 | sfq_link(q, x); | |
244 | } | |
245 | ||
246 | static unsigned int sfq_drop(struct Qdisc *sch) | |
247 | { | |
248 | struct sfq_sched_data *q = qdisc_priv(sch); | |
249 | sfq_index d = q->max_depth; | |
250 | struct sk_buff *skb; | |
251 | unsigned int len; | |
252 | ||
253 | /* Queue is full! Find the longest slot and | |
254 | drop a packet from it */ | |
255 | ||
256 | if (d > 1) { | |
6f9e98f7 | 257 | sfq_index x = q->dep[d + SFQ_DEPTH].next; |
1da177e4 | 258 | skb = q->qs[x].prev; |
0abf77e5 | 259 | len = qdisc_pkt_len(skb); |
1da177e4 LT |
260 | __skb_unlink(skb, &q->qs[x]); |
261 | kfree_skb(skb); | |
262 | sfq_dec(q, x); | |
263 | sch->q.qlen--; | |
264 | sch->qstats.drops++; | |
f5539eb8 | 265 | sch->qstats.backlog -= len; |
1da177e4 LT |
266 | return len; |
267 | } | |
268 | ||
269 | if (d == 1) { | |
270 | /* It is difficult to believe, but ALL THE SLOTS HAVE LENGTH 1. */ | |
271 | d = q->next[q->tail]; | |
272 | q->next[q->tail] = q->next[d]; | |
273 | q->allot[q->next[d]] += q->quantum; | |
274 | skb = q->qs[d].prev; | |
0abf77e5 | 275 | len = qdisc_pkt_len(skb); |
1da177e4 LT |
276 | __skb_unlink(skb, &q->qs[d]); |
277 | kfree_skb(skb); | |
278 | sfq_dec(q, d); | |
279 | sch->q.qlen--; | |
280 | q->ht[q->hash[d]] = SFQ_DEPTH; | |
281 | sch->qstats.drops++; | |
f5539eb8 | 282 | sch->qstats.backlog -= len; |
1da177e4 LT |
283 | return len; |
284 | } | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | static int | |
6f9e98f7 | 290 | sfq_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 LT |
291 | { |
292 | struct sfq_sched_data *q = qdisc_priv(sch); | |
7d2681a6 | 293 | unsigned int hash; |
1da177e4 | 294 | sfq_index x; |
7f3ff4f6 | 295 | int uninitialized_var(ret); |
7d2681a6 PM |
296 | |
297 | hash = sfq_classify(skb, sch, &ret); | |
298 | if (hash == 0) { | |
c27f339a | 299 | if (ret & __NET_XMIT_BYPASS) |
7d2681a6 PM |
300 | sch->qstats.drops++; |
301 | kfree_skb(skb); | |
302 | return ret; | |
303 | } | |
304 | hash--; | |
1da177e4 LT |
305 | |
306 | x = q->ht[hash]; | |
307 | if (x == SFQ_DEPTH) { | |
308 | q->ht[hash] = x = q->dep[SFQ_DEPTH].next; | |
309 | q->hash[x] = hash; | |
310 | } | |
6f9e98f7 | 311 | |
32740ddc AK |
312 | /* If selected queue has length q->limit, this means that |
313 | * all another queues are empty and that we do simple tail drop, | |
314 | * i.e. drop _this_ packet. | |
315 | */ | |
316 | if (q->qs[x].qlen >= q->limit) | |
317 | return qdisc_drop(skb, sch); | |
318 | ||
0abf77e5 | 319 | sch->qstats.backlog += qdisc_pkt_len(skb); |
1da177e4 LT |
320 | __skb_queue_tail(&q->qs[x], skb); |
321 | sfq_inc(q, x); | |
322 | if (q->qs[x].qlen == 1) { /* The flow is new */ | |
323 | if (q->tail == SFQ_DEPTH) { /* It is the first flow */ | |
324 | q->tail = x; | |
325 | q->next[x] = x; | |
326 | q->allot[x] = q->quantum; | |
327 | } else { | |
328 | q->next[x] = q->next[q->tail]; | |
329 | q->next[q->tail] = x; | |
330 | q->tail = x; | |
331 | } | |
332 | } | |
5588b40d | 333 | if (++sch->q.qlen <= q->limit) { |
0abf77e5 | 334 | sch->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 | 335 | sch->bstats.packets++; |
9871e50e | 336 | return NET_XMIT_SUCCESS; |
1da177e4 LT |
337 | } |
338 | ||
339 | sfq_drop(sch); | |
340 | return NET_XMIT_CN; | |
341 | } | |
342 | ||
48a8f519 PM |
343 | static struct sk_buff * |
344 | sfq_peek(struct Qdisc *sch) | |
345 | { | |
346 | struct sfq_sched_data *q = qdisc_priv(sch); | |
347 | sfq_index a; | |
1da177e4 | 348 | |
48a8f519 PM |
349 | /* No active slots */ |
350 | if (q->tail == SFQ_DEPTH) | |
351 | return NULL; | |
1da177e4 | 352 | |
48a8f519 PM |
353 | a = q->next[q->tail]; |
354 | return skb_peek(&q->qs[a]); | |
355 | } | |
1da177e4 LT |
356 | |
357 | static struct sk_buff * | |
6f9e98f7 | 358 | sfq_dequeue(struct Qdisc *sch) |
1da177e4 LT |
359 | { |
360 | struct sfq_sched_data *q = qdisc_priv(sch); | |
361 | struct sk_buff *skb; | |
362 | sfq_index a, old_a; | |
363 | ||
364 | /* No active slots */ | |
365 | if (q->tail == SFQ_DEPTH) | |
366 | return NULL; | |
367 | ||
368 | a = old_a = q->next[q->tail]; | |
369 | ||
370 | /* Grab packet */ | |
371 | skb = __skb_dequeue(&q->qs[a]); | |
372 | sfq_dec(q, a); | |
373 | sch->q.qlen--; | |
0abf77e5 | 374 | sch->qstats.backlog -= qdisc_pkt_len(skb); |
1da177e4 LT |
375 | |
376 | /* Is the slot empty? */ | |
377 | if (q->qs[a].qlen == 0) { | |
378 | q->ht[q->hash[a]] = SFQ_DEPTH; | |
379 | a = q->next[a]; | |
380 | if (a == old_a) { | |
381 | q->tail = SFQ_DEPTH; | |
382 | return skb; | |
383 | } | |
384 | q->next[q->tail] = a; | |
385 | q->allot[a] += q->quantum; | |
0abf77e5 | 386 | } else if ((q->allot[a] -= qdisc_pkt_len(skb)) <= 0) { |
1da177e4 LT |
387 | q->tail = a; |
388 | a = q->next[a]; | |
389 | q->allot[a] += q->quantum; | |
390 | } | |
391 | return skb; | |
392 | } | |
393 | ||
394 | static void | |
6f9e98f7 | 395 | sfq_reset(struct Qdisc *sch) |
1da177e4 LT |
396 | { |
397 | struct sk_buff *skb; | |
398 | ||
399 | while ((skb = sfq_dequeue(sch)) != NULL) | |
400 | kfree_skb(skb); | |
401 | } | |
402 | ||
403 | static void sfq_perturbation(unsigned long arg) | |
404 | { | |
6f9e98f7 | 405 | struct Qdisc *sch = (struct Qdisc *)arg; |
1da177e4 LT |
406 | struct sfq_sched_data *q = qdisc_priv(sch); |
407 | ||
d46f8dd8 | 408 | q->perturbation = net_random(); |
1da177e4 | 409 | |
32740ddc AK |
410 | if (q->perturb_period) |
411 | mod_timer(&q->perturb_timer, jiffies + q->perturb_period); | |
1da177e4 LT |
412 | } |
413 | ||
1e90474c | 414 | static int sfq_change(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
415 | { |
416 | struct sfq_sched_data *q = qdisc_priv(sch); | |
1e90474c | 417 | struct tc_sfq_qopt *ctl = nla_data(opt); |
5e50da01 | 418 | unsigned int qlen; |
1da177e4 | 419 | |
1e90474c | 420 | if (opt->nla_len < nla_attr_size(sizeof(*ctl))) |
1da177e4 LT |
421 | return -EINVAL; |
422 | ||
423 | sch_tree_lock(sch); | |
5ce2d488 | 424 | q->quantum = ctl->quantum ? : psched_mtu(qdisc_dev(sch)); |
6f9e98f7 | 425 | q->perturb_period = ctl->perturb_period * HZ; |
1da177e4 | 426 | if (ctl->limit) |
32740ddc | 427 | q->limit = min_t(u32, ctl->limit, SFQ_DEPTH - 1); |
1da177e4 | 428 | |
5e50da01 | 429 | qlen = sch->q.qlen; |
5588b40d | 430 | while (sch->q.qlen > q->limit) |
1da177e4 | 431 | sfq_drop(sch); |
5e50da01 | 432 | qdisc_tree_decrease_qlen(sch, qlen - sch->q.qlen); |
1da177e4 LT |
433 | |
434 | del_timer(&q->perturb_timer); | |
435 | if (q->perturb_period) { | |
32740ddc | 436 | mod_timer(&q->perturb_timer, jiffies + q->perturb_period); |
d46f8dd8 | 437 | q->perturbation = net_random(); |
1da177e4 LT |
438 | } |
439 | sch_tree_unlock(sch); | |
440 | return 0; | |
441 | } | |
442 | ||
1e90474c | 443 | static int sfq_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
444 | { |
445 | struct sfq_sched_data *q = qdisc_priv(sch); | |
446 | int i; | |
447 | ||
d3e99483 | 448 | q->perturb_timer.function = sfq_perturbation; |
c19a28e1 | 449 | q->perturb_timer.data = (unsigned long)sch; |
d3e99483 | 450 | init_timer_deferrable(&q->perturb_timer); |
1da177e4 | 451 | |
6f9e98f7 | 452 | for (i = 0; i < SFQ_HASH_DIVISOR; i++) |
1da177e4 | 453 | q->ht[i] = SFQ_DEPTH; |
6f9e98f7 SH |
454 | |
455 | for (i = 0; i < SFQ_DEPTH; i++) { | |
1da177e4 | 456 | skb_queue_head_init(&q->qs[i]); |
6f9e98f7 SH |
457 | q->dep[i + SFQ_DEPTH].next = i + SFQ_DEPTH; |
458 | q->dep[i + SFQ_DEPTH].prev = i + SFQ_DEPTH; | |
1da177e4 | 459 | } |
6f9e98f7 | 460 | |
32740ddc | 461 | q->limit = SFQ_DEPTH - 1; |
1da177e4 LT |
462 | q->max_depth = 0; |
463 | q->tail = SFQ_DEPTH; | |
464 | if (opt == NULL) { | |
5ce2d488 | 465 | q->quantum = psched_mtu(qdisc_dev(sch)); |
1da177e4 | 466 | q->perturb_period = 0; |
d46f8dd8 | 467 | q->perturbation = net_random(); |
1da177e4 LT |
468 | } else { |
469 | int err = sfq_change(sch, opt); | |
470 | if (err) | |
471 | return err; | |
472 | } | |
6f9e98f7 SH |
473 | |
474 | for (i = 0; i < SFQ_DEPTH; i++) | |
1da177e4 LT |
475 | sfq_link(q, i); |
476 | return 0; | |
477 | } | |
478 | ||
479 | static void sfq_destroy(struct Qdisc *sch) | |
480 | { | |
481 | struct sfq_sched_data *q = qdisc_priv(sch); | |
7d2681a6 | 482 | |
ff31ab56 | 483 | tcf_destroy_chain(&q->filter_list); |
980c478d JP |
484 | q->perturb_period = 0; |
485 | del_timer_sync(&q->perturb_timer); | |
1da177e4 LT |
486 | } |
487 | ||
488 | static int sfq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
489 | { | |
490 | struct sfq_sched_data *q = qdisc_priv(sch); | |
27a884dc | 491 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
492 | struct tc_sfq_qopt opt; |
493 | ||
494 | opt.quantum = q->quantum; | |
6f9e98f7 | 495 | opt.perturb_period = q->perturb_period / HZ; |
1da177e4 LT |
496 | |
497 | opt.limit = q->limit; | |
498 | opt.divisor = SFQ_HASH_DIVISOR; | |
cdec7e50 | 499 | opt.flows = q->limit; |
1da177e4 | 500 | |
1e90474c | 501 | NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); |
1da177e4 LT |
502 | |
503 | return skb->len; | |
504 | ||
1e90474c | 505 | nla_put_failure: |
dc5fc579 | 506 | nlmsg_trim(skb, b); |
1da177e4 LT |
507 | return -1; |
508 | } | |
509 | ||
41065fba JP |
510 | static struct Qdisc *sfq_leaf(struct Qdisc *sch, unsigned long arg) |
511 | { | |
512 | return NULL; | |
513 | } | |
514 | ||
7d2681a6 PM |
515 | static unsigned long sfq_get(struct Qdisc *sch, u32 classid) |
516 | { | |
517 | return 0; | |
518 | } | |
519 | ||
eb4a5527 JP |
520 | static unsigned long sfq_bind(struct Qdisc *sch, unsigned long parent, |
521 | u32 classid) | |
522 | { | |
523 | return 0; | |
524 | } | |
525 | ||
da7115d9 JP |
526 | static void sfq_put(struct Qdisc *q, unsigned long cl) |
527 | { | |
528 | } | |
529 | ||
7d2681a6 PM |
530 | static struct tcf_proto **sfq_find_tcf(struct Qdisc *sch, unsigned long cl) |
531 | { | |
532 | struct sfq_sched_data *q = qdisc_priv(sch); | |
533 | ||
534 | if (cl) | |
535 | return NULL; | |
536 | return &q->filter_list; | |
537 | } | |
538 | ||
94de78d1 PM |
539 | static int sfq_dump_class(struct Qdisc *sch, unsigned long cl, |
540 | struct sk_buff *skb, struct tcmsg *tcm) | |
541 | { | |
542 | tcm->tcm_handle |= TC_H_MIN(cl); | |
543 | return 0; | |
544 | } | |
545 | ||
546 | static int sfq_dump_class_stats(struct Qdisc *sch, unsigned long cl, | |
547 | struct gnet_dump *d) | |
548 | { | |
549 | struct sfq_sched_data *q = qdisc_priv(sch); | |
550 | sfq_index idx = q->ht[cl-1]; | |
551 | struct gnet_stats_queue qs = { .qlen = q->qs[idx].qlen }; | |
552 | struct tc_sfq_xstats xstats = { .allot = q->allot[idx] }; | |
553 | ||
554 | if (gnet_stats_copy_queue(d, &qs) < 0) | |
555 | return -1; | |
556 | return gnet_stats_copy_app(d, &xstats, sizeof(xstats)); | |
557 | } | |
558 | ||
7d2681a6 PM |
559 | static void sfq_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
560 | { | |
94de78d1 PM |
561 | struct sfq_sched_data *q = qdisc_priv(sch); |
562 | unsigned int i; | |
563 | ||
564 | if (arg->stop) | |
565 | return; | |
566 | ||
567 | for (i = 0; i < SFQ_HASH_DIVISOR; i++) { | |
568 | if (q->ht[i] == SFQ_DEPTH || | |
569 | arg->count < arg->skip) { | |
570 | arg->count++; | |
571 | continue; | |
572 | } | |
573 | if (arg->fn(sch, i + 1, arg) < 0) { | |
574 | arg->stop = 1; | |
575 | break; | |
576 | } | |
577 | arg->count++; | |
578 | } | |
7d2681a6 PM |
579 | } |
580 | ||
581 | static const struct Qdisc_class_ops sfq_class_ops = { | |
41065fba | 582 | .leaf = sfq_leaf, |
7d2681a6 | 583 | .get = sfq_get, |
da7115d9 | 584 | .put = sfq_put, |
7d2681a6 | 585 | .tcf_chain = sfq_find_tcf, |
eb4a5527 | 586 | .bind_tcf = sfq_bind, |
da7115d9 | 587 | .unbind_tcf = sfq_put, |
94de78d1 PM |
588 | .dump = sfq_dump_class, |
589 | .dump_stats = sfq_dump_class_stats, | |
7d2681a6 PM |
590 | .walk = sfq_walk, |
591 | }; | |
592 | ||
20fea08b | 593 | static struct Qdisc_ops sfq_qdisc_ops __read_mostly = { |
7d2681a6 | 594 | .cl_ops = &sfq_class_ops, |
1da177e4 LT |
595 | .id = "sfq", |
596 | .priv_size = sizeof(struct sfq_sched_data), | |
597 | .enqueue = sfq_enqueue, | |
598 | .dequeue = sfq_dequeue, | |
48a8f519 | 599 | .peek = sfq_peek, |
1da177e4 LT |
600 | .drop = sfq_drop, |
601 | .init = sfq_init, | |
602 | .reset = sfq_reset, | |
603 | .destroy = sfq_destroy, | |
604 | .change = NULL, | |
605 | .dump = sfq_dump, | |
606 | .owner = THIS_MODULE, | |
607 | }; | |
608 | ||
609 | static int __init sfq_module_init(void) | |
610 | { | |
611 | return register_qdisc(&sfq_qdisc_ops); | |
612 | } | |
10297b99 | 613 | static void __exit sfq_module_exit(void) |
1da177e4 LT |
614 | { |
615 | unregister_qdisc(&sfq_qdisc_ops); | |
616 | } | |
617 | module_init(sfq_module_init) | |
618 | module_exit(sfq_module_exit) | |
619 | MODULE_LICENSE("GPL"); |