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[openwrt.git] / target / linux / generic-2.6 / patches / 200-sched_esfq.patch
1 diff -urN linux-2.6.21.1.old/include/linux/pkt_sched.h linux-2.6.21.1.dev/include/linux/pkt_sched.h
2 --- linux-2.6.21.1.old/include/linux/pkt_sched.h 2007-04-27 23:49:26.000000000 +0200
3 +++ linux-2.6.21.1.dev/include/linux/pkt_sched.h 2007-05-26 20:43:12.530587320 +0200
4 @@ -146,8 +146,40 @@
5 *
6 * The only reason for this is efficiency, it is possible
7 * to change these parameters in compile time.
8 + *
9 + * If you need to play with these values use esfq instead.
10 */
11
12 +/* ESFQ section */
13 +
14 +enum
15 +{
16 + /* traditional */
17 + TCA_SFQ_HASH_CLASSIC,
18 + TCA_SFQ_HASH_DST,
19 + TCA_SFQ_HASH_SRC,
20 + TCA_SFQ_HASH_FWMARK,
21 + /* direct */
22 + TCA_SFQ_HASH_DSTDIR,
23 + TCA_SFQ_HASH_SRCDIR,
24 + TCA_SFQ_HASH_FWMARKDIR,
25 + /* conntrack */
26 + TCA_SFQ_HASH_CTORIGDST,
27 + TCA_SFQ_HASH_CTORIGSRC,
28 + TCA_SFQ_HASH_CTREPLDST,
29 + TCA_SFQ_HASH_CTREPLSRC,
30 +};
31 +
32 +struct tc_esfq_qopt
33 +{
34 + unsigned quantum; /* Bytes per round allocated to flow */
35 + int perturb_period; /* Period of hash perturbation */
36 + __u32 limit; /* Maximal packets in queue */
37 + unsigned divisor; /* Hash divisor */
38 + unsigned flows; /* Maximal number of flows */
39 + unsigned hash_kind; /* Hash function to use for flow identification */
40 +};
41 +
42 /* RED section */
43
44 enum
45 diff -urN linux-2.6.21.1.old/net/sched/Kconfig linux-2.6.21.1.dev/net/sched/Kconfig
46 --- linux-2.6.21.1.old/net/sched/Kconfig 2007-04-27 23:49:26.000000000 +0200
47 +++ linux-2.6.21.1.dev/net/sched/Kconfig 2007-05-26 20:43:12.572580936 +0200
48 @@ -189,6 +189,26 @@
49 To compile this code as a module, choose M here: the
50 module will be called sch_sfq.
51
52 +config NET_SCH_ESFQ
53 + tristate "Enhanced Stochastic Fairness Queueing (ESFQ)"
54 + ---help---
55 + Say Y here if you want to use the Enhanced Stochastic Fairness
56 + Queueing (ESFQ) packet scheduling algorithm for some of your network
57 + devices or as a leaf discipline for a classful qdisc such as HTB or
58 + CBQ (see the top of <file:net/sched/sch_esfq.c> for details and
59 + references to the SFQ algorithm).
60 +
61 + This is an enchanced SFQ version which allows you to control some
62 + hardcoded values in the SFQ scheduler.
63 +
64 + ESFQ also adds control of the hash function used to identify packet
65 + flows. The original SFQ discipline hashes by connection; ESFQ add
66 + several other hashing methods, such as by src IP or by dst IP, which
67 + can be more fair to users in some networking situations.
68 +
69 + To compile this code as a module, choose M here: the
70 + module will be called sch_esfq.
71 +
72 config NET_SCH_TEQL
73 tristate "True Link Equalizer (TEQL)"
74 ---help---
75 diff -urN linux-2.6.21.1.old/net/sched/Makefile linux-2.6.21.1.dev/net/sched/Makefile
76 --- linux-2.6.21.1.old/net/sched/Makefile 2007-04-27 23:49:26.000000000 +0200
77 +++ linux-2.6.21.1.dev/net/sched/Makefile 2007-05-26 20:43:12.577580176 +0200
78 @@ -23,6 +23,7 @@
79 obj-$(CONFIG_NET_SCH_INGRESS) += sch_ingress.o
80 obj-$(CONFIG_NET_SCH_DSMARK) += sch_dsmark.o
81 obj-$(CONFIG_NET_SCH_SFQ) += sch_sfq.o
82 +obj-$(CONFIG_NET_SCH_ESFQ) += sch_esfq.o
83 obj-$(CONFIG_NET_SCH_TBF) += sch_tbf.o
84 obj-$(CONFIG_NET_SCH_TEQL) += sch_teql.o
85 obj-$(CONFIG_NET_SCH_PRIO) += sch_prio.o
86 diff -urN linux-2.6.21.1.old/net/sched/sch_esfq.c linux-2.6.21.1.dev/net/sched/sch_esfq.c
87 --- linux-2.6.21.1.old/net/sched/sch_esfq.c 1970-01-01 01:00:00.000000000 +0100
88 +++ linux-2.6.21.1.dev/net/sched/sch_esfq.c 2007-05-26 20:43:12.578580024 +0200
89 @@ -0,0 +1,704 @@
90 +/*
91 + * net/sched/sch_esfq.c Extended Stochastic Fairness Queueing discipline.
92 + *
93 + * This program is free software; you can redistribute it and/or
94 + * modify it under the terms of the GNU General Public License
95 + * as published by the Free Software Foundation; either version
96 + * 2 of the License, or (at your option) any later version.
97 + *
98 + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
99 + *
100 + * Changes: Alexander Atanasov, <alex@ssi.bg>
101 + * Added dynamic depth,limit,divisor,hash_kind options.
102 + * Added dst and src hashes.
103 + *
104 + * Alexander Clouter, <alex@digriz.org.uk>
105 + * Ported ESFQ to Linux 2.6.
106 + *
107 + * Corey Hickey, <bugfood-c@fatooh.org>
108 + * Maintenance of the Linux 2.6 port.
109 + * Added fwmark hash (thanks to Robert Kurjata).
110 + * Added direct hashing for src, dst, and fwmark.
111 + * Added usage of jhash.
112 + *
113 + */
114 +
115 +#include <linux/module.h>
116 +#include <asm/uaccess.h>
117 +#include <asm/system.h>
118 +#include <linux/bitops.h>
119 +#include <linux/types.h>
120 +#include <linux/kernel.h>
121 +#include <linux/jiffies.h>
122 +#include <linux/string.h>
123 +#include <linux/mm.h>
124 +#include <linux/socket.h>
125 +#include <linux/sockios.h>
126 +#include <linux/in.h>
127 +#include <linux/errno.h>
128 +#include <linux/interrupt.h>
129 +#include <linux/if_ether.h>
130 +#include <linux/inet.h>
131 +#include <linux/netdevice.h>
132 +#include <linux/etherdevice.h>
133 +#include <linux/notifier.h>
134 +#include <linux/init.h>
135 +#include <net/ip.h>
136 +#include <linux/ipv6.h>
137 +#include <net/route.h>
138 +#include <linux/skbuff.h>
139 +#include <net/sock.h>
140 +#include <net/pkt_sched.h>
141 +#include <linux/jhash.h>
142 +
143 +#ifdef CONFIG_NF_CONNTRACK_ENABLED
144 +#include <net/netfilter/nf_conntrack.h>
145 +#endif
146 +
147 +/* Stochastic Fairness Queuing algorithm.
148 + For more comments look at sch_sfq.c.
149 + The difference is that you can change limit, depth,
150 + hash table size and choose alternate hash types.
151 +
152 + classic: same as in sch_sfq.c
153 + dst: destination IP address
154 + src: source IP address
155 + fwmark: netfilter mark value
156 + dst_direct:
157 + src_direct:
158 + fwmark_direct: direct hashing of the above sources
159 + ctorigdst: original destination IP address
160 + ctorigsrc: original source IP address
161 + ctrepldst: reply destination IP address
162 + ctreplsrc: reply source IP
163 +
164 +*/
165 +
166 +
167 +/* This type should contain at least SFQ_DEPTH*2 values */
168 +typedef unsigned int esfq_index;
169 +
170 +struct esfq_head
171 +{
172 + esfq_index next;
173 + esfq_index prev;
174 +};
175 +
176 +struct esfq_sched_data
177 +{
178 +/* Parameters */
179 + int perturb_period;
180 + unsigned quantum; /* Allotment per round: MUST BE >= MTU */
181 + int limit;
182 + unsigned depth;
183 + unsigned hash_divisor;
184 + unsigned hash_kind;
185 +/* Variables */
186 + struct timer_list perturb_timer;
187 + int perturbation;
188 + esfq_index tail; /* Index of current slot in round */
189 + esfq_index max_depth; /* Maximal depth */
190 +
191 + esfq_index *ht; /* Hash table */
192 + esfq_index *next; /* Active slots link */
193 + short *allot; /* Current allotment per slot */
194 + unsigned short *hash; /* Hash value indexed by slots */
195 + struct sk_buff_head *qs; /* Slot queue */
196 + struct esfq_head *dep; /* Linked list of slots, indexed by depth */
197 + unsigned dyn_min; /* For dynamic divisor adjustment; minimum value seen */
198 + unsigned dyn_max; /* maximum value seen */
199 + unsigned dyn_range; /* saved range */
200 +};
201 +
202 +/* This contains the info we will hash. */
203 +struct esfq_packet_info
204 +{
205 + u32 proto; /* protocol or port */
206 + u32 src; /* source from packet header */
207 + u32 dst; /* destination from packet header */
208 + u32 ctorigsrc; /* original source from conntrack */
209 + u32 ctorigdst; /* original destination from conntrack */
210 + u32 ctreplsrc; /* reply source from conntrack */
211 + u32 ctrepldst; /* reply destination from conntrack */
212 + u32 mark; /* netfilter mark (fwmark) */
213 +};
214 +
215 +/* Hash input values directly into the "nearest" slot, taking into account the
216 + * range of input values seen. This is most useful when the hash table is at
217 + * least as large as the range of possible values.
218 + * Note: this functionality was added before the change to using jhash, and may
219 + * no longer be useful. */
220 +static __inline__ unsigned esfq_hash_direct(struct esfq_sched_data *q, u32 h)
221 +{
222 + /* adjust minimum and maximum */
223 + if (h < q->dyn_min || h > q->dyn_max) {
224 + q->dyn_min = h < q->dyn_min ? h : q->dyn_min;
225 + q->dyn_max = h > q->dyn_max ? h : q->dyn_max;
226 +
227 + /* find new range */
228 + if ((q->dyn_range = q->dyn_max - q->dyn_min) >= q->hash_divisor)
229 + printk(KERN_WARNING "ESFQ: (direct hash) Input range %u is larger than hash "
230 + "table. See ESFQ README for details.\n", q->dyn_range);
231 + }
232 +
233 + /* hash input values into slot numbers */
234 + if (q->dyn_min == q->dyn_max)
235 + return 0; /* only one value seen; avoid division by 0 */
236 + else
237 + return (h - q->dyn_min) * (q->hash_divisor - 1) / q->dyn_range;
238 +}
239 +
240 +static __inline__ unsigned esfq_jhash_1word(struct esfq_sched_data *q,u32 a)
241 +{
242 + return jhash_1word(a, q->perturbation) & (q->hash_divisor-1);
243 +}
244 +
245 +static __inline__ unsigned esfq_jhash_2words(struct esfq_sched_data *q, u32 a, u32 b)
246 +{
247 + return jhash_2words(a, b, q->perturbation) & (q->hash_divisor-1);
248 +}
249 +
250 +static __inline__ unsigned esfq_jhash_3words(struct esfq_sched_data *q, u32 a, u32 b, u32 c)
251 +{
252 + return jhash_3words(a, b, c, q->perturbation) & (q->hash_divisor-1);
253 +}
254 +
255 +
256 +static unsigned esfq_hash(struct esfq_sched_data *q, struct sk_buff *skb)
257 +{
258 + struct esfq_packet_info info;
259 +#ifdef CONFIG_NF_CONNTRACK_ENABLED
260 + enum ip_conntrack_info ctinfo;
261 + struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
262 +#endif
263 +
264 + switch (skb->protocol) {
265 + case __constant_htons(ETH_P_IP):
266 + {
267 + struct iphdr *iph = skb->nh.iph;
268 + info.dst = iph->daddr;
269 + info.src = iph->saddr;
270 + if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) &&
271 + (iph->protocol == IPPROTO_TCP ||
272 + iph->protocol == IPPROTO_UDP ||
273 + iph->protocol == IPPROTO_SCTP ||
274 + iph->protocol == IPPROTO_DCCP ||
275 + iph->protocol == IPPROTO_ESP))
276 + info.proto = *(((u32*)iph) + iph->ihl);
277 + else
278 + info.proto = iph->protocol;
279 + break;
280 + }
281 + case __constant_htons(ETH_P_IPV6):
282 + {
283 + struct ipv6hdr *iph = skb->nh.ipv6h;
284 + /* Hash ipv6 addresses into a u32. This isn't ideal,
285 + * but the code is simple. */
286 + info.dst = jhash2(iph->daddr.s6_addr32, 4, q->perturbation);
287 + info.src = jhash2(iph->saddr.s6_addr32, 4, q->perturbation);
288 + if (iph->nexthdr == IPPROTO_TCP ||
289 + iph->nexthdr == IPPROTO_UDP ||
290 + iph->nexthdr == IPPROTO_SCTP ||
291 + iph->nexthdr == IPPROTO_DCCP ||
292 + iph->nexthdr == IPPROTO_ESP)
293 + info.proto = *(u32*)&iph[1];
294 + else
295 + info.proto = iph->nexthdr;
296 + break;
297 + }
298 + default:
299 + info.dst = (u32)(unsigned long)skb->dst;
300 + info.src = (u32)(unsigned long)skb->sk;
301 + info.proto = skb->protocol;
302 + }
303 +
304 + info.mark = skb->mark;
305 +
306 +#ifdef CONFIG_NF_CONNTRACK_ENABLED
307 + /* defaults if there is no conntrack info */
308 + info.ctorigsrc = info.src;
309 + info.ctorigdst = info.dst;
310 + info.ctreplsrc = info.dst;
311 + info.ctrepldst = info.src;
312 + /* collect conntrack info */
313 + if (ct && ct != &nf_conntrack_untracked) {
314 + if (skb->protocol == __constant_htons(ETH_P_IP)) {
315 + info.ctorigsrc = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
316 + info.ctorigdst = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.ip;
317 + info.ctreplsrc = ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip;
318 + info.ctrepldst = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip;
319 + }
320 + else if (skb->protocol == __constant_htons(ETH_P_IPV6)) {
321 + /* Again, hash ipv6 addresses into a single u32. */
322 + info.ctorigsrc = jhash2(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip6, 4, q->perturbation);
323 + info.ctorigdst = jhash2(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.ip6, 4, q->perturbation);
324 + info.ctreplsrc = jhash2(ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip6, 4, q->perturbation);
325 + info.ctrepldst = jhash2(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip6, 4, q->perturbation);
326 + }
327 +
328 + }
329 +#endif
330 +
331 + switch(q->hash_kind)
332 + {
333 + case TCA_SFQ_HASH_CLASSIC:
334 + return esfq_jhash_3words(q, info.dst, info.src, info.proto);
335 + case TCA_SFQ_HASH_DST:
336 + return esfq_jhash_1word(q, info.dst);
337 + case TCA_SFQ_HASH_DSTDIR:
338 + return esfq_hash_direct(q, ntohl(info.dst));
339 + case TCA_SFQ_HASH_SRC:
340 + return esfq_jhash_1word(q, info.src);
341 + case TCA_SFQ_HASH_SRCDIR:
342 + return esfq_hash_direct(q, ntohl(info.src));
343 + case TCA_SFQ_HASH_FWMARK:
344 + return esfq_jhash_1word(q, info.mark);
345 + case TCA_SFQ_HASH_FWMARKDIR:
346 + return esfq_hash_direct(q, info.mark);
347 +#ifdef CONFIG_NF_CONNTRACK_ENABLED
348 + case TCA_SFQ_HASH_CTORIGDST:
349 + return esfq_jhash_1word(q, info.ctorigdst);
350 + case TCA_SFQ_HASH_CTORIGSRC:
351 + return esfq_jhash_1word(q, info.ctorigsrc);
352 + case TCA_SFQ_HASH_CTREPLDST:
353 + return esfq_jhash_1word(q, info.ctrepldst);
354 + case TCA_SFQ_HASH_CTREPLSRC:
355 + return esfq_jhash_1word(q, info.ctreplsrc);
356 +#endif
357 + default:
358 + if (net_ratelimit())
359 + printk(KERN_WARNING "ESFQ: Unknown hash method. Falling back to classic.\n");
360 + }
361 + return esfq_jhash_3words(q, info.dst, info.src, info.proto);
362 +}
363 +
364 +static inline void esfq_link(struct esfq_sched_data *q, esfq_index x)
365 +{
366 + esfq_index p, n;
367 + int d = q->qs[x].qlen + q->depth;
368 +
369 + p = d;
370 + n = q->dep[d].next;
371 + q->dep[x].next = n;
372 + q->dep[x].prev = p;
373 + q->dep[p].next = q->dep[n].prev = x;
374 +}
375 +
376 +static inline void esfq_dec(struct esfq_sched_data *q, esfq_index x)
377 +{
378 + esfq_index p, n;
379 +
380 + n = q->dep[x].next;
381 + p = q->dep[x].prev;
382 + q->dep[p].next = n;
383 + q->dep[n].prev = p;
384 +
385 + if (n == p && q->max_depth == q->qs[x].qlen + 1)
386 + q->max_depth--;
387 +
388 + esfq_link(q, x);
389 +}
390 +
391 +static inline void esfq_inc(struct esfq_sched_data *q, esfq_index x)
392 +{
393 + esfq_index p, n;
394 + int d;
395 +
396 + n = q->dep[x].next;
397 + p = q->dep[x].prev;
398 + q->dep[p].next = n;
399 + q->dep[n].prev = p;
400 + d = q->qs[x].qlen;
401 + if (q->max_depth < d)
402 + q->max_depth = d;
403 +
404 + esfq_link(q, x);
405 +}
406 +
407 +static unsigned int esfq_drop(struct Qdisc *sch)
408 +{
409 + struct esfq_sched_data *q = qdisc_priv(sch);
410 + esfq_index d = q->max_depth;
411 + struct sk_buff *skb;
412 + unsigned int len;
413 +
414 + /* Queue is full! Find the longest slot and
415 + drop a packet from it */
416 +
417 + if (d > 1) {
418 + esfq_index x = q->dep[d+q->depth].next;
419 + skb = q->qs[x].prev;
420 + len = skb->len;
421 + __skb_unlink(skb, &q->qs[x]);
422 + kfree_skb(skb);
423 + esfq_dec(q, x);
424 + sch->q.qlen--;
425 + sch->qstats.drops++;
426 + sch->qstats.backlog -= len;
427 + return len;
428 + }
429 +
430 + if (d == 1) {
431 + /* It is difficult to believe, but ALL THE SLOTS HAVE LENGTH 1. */
432 + d = q->next[q->tail];
433 + q->next[q->tail] = q->next[d];
434 + q->allot[q->next[d]] += q->quantum;
435 + skb = q->qs[d].prev;
436 + len = skb->len;
437 + __skb_unlink(skb, &q->qs[d]);
438 + kfree_skb(skb);
439 + esfq_dec(q, d);
440 + sch->q.qlen--;
441 + q->ht[q->hash[d]] = q->depth;
442 + sch->qstats.drops++;
443 + sch->qstats.backlog -= len;
444 + return len;
445 + }
446 +
447 + return 0;
448 +}
449 +
450 +static int
451 +esfq_enqueue(struct sk_buff *skb, struct Qdisc* sch)
452 +{
453 + struct esfq_sched_data *q = qdisc_priv(sch);
454 + unsigned hash = esfq_hash(q, skb);
455 + unsigned depth = q->depth;
456 + esfq_index x;
457 +
458 + x = q->ht[hash];
459 + if (x == depth) {
460 + q->ht[hash] = x = q->dep[depth].next;
461 + q->hash[x] = hash;
462 + }
463 + sch->qstats.backlog += skb->len;
464 + __skb_queue_tail(&q->qs[x], skb);
465 + esfq_inc(q, x);
466 + if (q->qs[x].qlen == 1) { /* The flow is new */
467 + if (q->tail == depth) { /* It is the first flow */
468 + q->tail = x;
469 + q->next[x] = x;
470 + q->allot[x] = q->quantum;
471 + } else {
472 + q->next[x] = q->next[q->tail];
473 + q->next[q->tail] = x;
474 + q->tail = x;
475 + }
476 + }
477 + if (++sch->q.qlen < q->limit-1) {
478 + sch->bstats.bytes += skb->len;
479 + sch->bstats.packets++;
480 + return 0;
481 + }
482 +
483 + esfq_drop(sch);
484 + return NET_XMIT_CN;
485 +}
486 +
487 +static int
488 +esfq_requeue(struct sk_buff *skb, struct Qdisc* sch)
489 +{
490 + struct esfq_sched_data *q = qdisc_priv(sch);
491 + unsigned hash = esfq_hash(q, skb);
492 + unsigned depth = q->depth;
493 + esfq_index x;
494 +
495 + x = q->ht[hash];
496 + if (x == depth) {
497 + q->ht[hash] = x = q->dep[depth].next;
498 + q->hash[x] = hash;
499 + }
500 + sch->qstats.backlog += skb->len;
501 + __skb_queue_head(&q->qs[x], skb);
502 + esfq_inc(q, x);
503 + if (q->qs[x].qlen == 1) { /* The flow is new */
504 + if (q->tail == depth) { /* It is the first flow */
505 + q->tail = x;
506 + q->next[x] = x;
507 + q->allot[x] = q->quantum;
508 + } else {
509 + q->next[x] = q->next[q->tail];
510 + q->next[q->tail] = x;
511 + q->tail = x;
512 + }
513 + }
514 + if (++sch->q.qlen < q->limit - 1) {
515 + sch->qstats.requeues++;
516 + return 0;
517 + }
518 +
519 + sch->qstats.drops++;
520 + esfq_drop(sch);
521 + return NET_XMIT_CN;
522 +}
523 +
524 +
525 +
526 +
527 +static struct sk_buff *
528 +esfq_dequeue(struct Qdisc* sch)
529 +{
530 + struct esfq_sched_data *q = qdisc_priv(sch);
531 + struct sk_buff *skb;
532 + unsigned depth = q->depth;
533 + esfq_index a, old_a;
534 +
535 + /* No active slots */
536 + if (q->tail == depth)
537 + return NULL;
538 +
539 + a = old_a = q->next[q->tail];
540 +
541 + /* Grab packet */
542 + skb = __skb_dequeue(&q->qs[a]);
543 + esfq_dec(q, a);
544 + sch->q.qlen--;
545 + sch->qstats.backlog -= skb->len;
546 +
547 + /* Is the slot empty? */
548 + if (q->qs[a].qlen == 0) {
549 + q->ht[q->hash[a]] = depth;
550 + a = q->next[a];
551 + if (a == old_a) {
552 + q->tail = depth;
553 + return skb;
554 + }
555 + q->next[q->tail] = a;
556 + q->allot[a] += q->quantum;
557 + } else if ((q->allot[a] -= skb->len) <= 0) {
558 + q->tail = a;
559 + a = q->next[a];
560 + q->allot[a] += q->quantum;
561 + }
562 +
563 + return skb;
564 +}
565 +
566 +static void
567 +esfq_reset(struct Qdisc* sch)
568 +{
569 + struct sk_buff *skb;
570 +
571 + while ((skb = esfq_dequeue(sch)) != NULL)
572 + kfree_skb(skb);
573 +}
574 +
575 +static void esfq_perturbation(unsigned long arg)
576 +{
577 + struct Qdisc *sch = (struct Qdisc*)arg;
578 + struct esfq_sched_data *q = qdisc_priv(sch);
579 +
580 + q->perturbation = net_random()&0x1F;
581 +
582 + if (q->perturb_period) {
583 + q->perturb_timer.expires = jiffies + q->perturb_period;
584 + add_timer(&q->perturb_timer);
585 + }
586 +}
587 +
588 +static int esfq_change(struct Qdisc *sch, struct rtattr *opt)
589 +{
590 + struct esfq_sched_data *q = qdisc_priv(sch);
591 + struct tc_esfq_qopt *ctl = RTA_DATA(opt);
592 + int old_perturb = q->perturb_period;
593 +
594 + if (opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
595 + return -EINVAL;
596 +
597 + sch_tree_lock(sch);
598 + q->quantum = ctl->quantum ? : psched_mtu(sch->dev);
599 + q->perturb_period = ctl->perturb_period*HZ;
600 +// q->hash_divisor = ctl->divisor;
601 +// q->tail = q->limit = q->depth = ctl->flows;
602 +
603 + if (ctl->limit)
604 + q->limit = min_t(u32, ctl->limit, q->depth);
605 +
606 + if (ctl->hash_kind) {
607 + q->hash_kind = ctl->hash_kind;
608 + if (q->hash_kind != TCA_SFQ_HASH_CLASSIC)
609 + q->perturb_period = 0;
610 + }
611 +
612 + // is sch_tree_lock enough to do this ?
613 + while (sch->q.qlen >= q->limit-1)
614 + esfq_drop(sch);
615 +
616 + if (old_perturb)
617 + del_timer(&q->perturb_timer);
618 + if (q->perturb_period) {
619 + q->perturb_timer.expires = jiffies + q->perturb_period;
620 + add_timer(&q->perturb_timer);
621 + } else {
622 + q->perturbation = 0;
623 + }
624 + sch_tree_unlock(sch);
625 + return 0;
626 +}
627 +
628 +static int esfq_init(struct Qdisc *sch, struct rtattr *opt)
629 +{
630 + struct esfq_sched_data *q = qdisc_priv(sch);
631 + struct tc_esfq_qopt *ctl;
632 + esfq_index p = ~0U/2;
633 + int i;
634 +
635 + if (opt && opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
636 + return -EINVAL;
637 +
638 + init_timer(&q->perturb_timer);
639 + q->perturb_timer.data = (unsigned long)sch;
640 + q->perturb_timer.function = esfq_perturbation;
641 + q->perturbation = 0;
642 + q->hash_kind = TCA_SFQ_HASH_CLASSIC;
643 + q->max_depth = 0;
644 + q->dyn_min = ~0U; /* maximum value for this type */
645 + q->dyn_max = 0; /* dyn_min/dyn_max will be set properly upon first packet */
646 + if (opt == NULL) {
647 + q->quantum = psched_mtu(sch->dev);
648 + q->perturb_period = 0;
649 + q->hash_divisor = 1024;
650 + q->tail = q->limit = q->depth = 128;
651 +
652 + } else {
653 + ctl = RTA_DATA(opt);
654 + q->quantum = ctl->quantum ? : psched_mtu(sch->dev);
655 + q->perturb_period = ctl->perturb_period*HZ;
656 + q->hash_divisor = ctl->divisor ? : 1024;
657 + q->tail = q->limit = q->depth = ctl->flows ? : 128;
658 +
659 + if ( q->depth > p - 1 )
660 + return -EINVAL;
661 +
662 + if (ctl->limit)
663 + q->limit = min_t(u32, ctl->limit, q->depth);
664 +
665 + if (ctl->hash_kind) {
666 + q->hash_kind = ctl->hash_kind;
667 + }
668 +
669 + if (q->perturb_period) {
670 + q->perturb_timer.expires = jiffies + q->perturb_period;
671 + add_timer(&q->perturb_timer);
672 + }
673 + }
674 +
675 + q->ht = kmalloc(q->hash_divisor*sizeof(esfq_index), GFP_KERNEL);
676 + if (!q->ht)
677 + goto err_case;
678 +
679 + q->dep = kmalloc((1+q->depth*2)*sizeof(struct esfq_head), GFP_KERNEL);
680 + if (!q->dep)
681 + goto err_case;
682 + q->next = kmalloc(q->depth*sizeof(esfq_index), GFP_KERNEL);
683 + if (!q->next)
684 + goto err_case;
685 +
686 + q->allot = kmalloc(q->depth*sizeof(short), GFP_KERNEL);
687 + if (!q->allot)
688 + goto err_case;
689 + q->hash = kmalloc(q->depth*sizeof(unsigned short), GFP_KERNEL);
690 + if (!q->hash)
691 + goto err_case;
692 + q->qs = kmalloc(q->depth*sizeof(struct sk_buff_head), GFP_KERNEL);
693 + if (!q->qs)
694 + goto err_case;
695 +
696 + for (i=0; i< q->hash_divisor; i++)
697 + q->ht[i] = q->depth;
698 + for (i=0; i<q->depth; i++) {
699 + skb_queue_head_init(&q->qs[i]);
700 + q->dep[i+q->depth].next = i+q->depth;
701 + q->dep[i+q->depth].prev = i+q->depth;
702 + }
703 +
704 + for (i=0; i<q->depth; i++)
705 + esfq_link(q, i);
706 + return 0;
707 +err_case:
708 + del_timer(&q->perturb_timer);
709 + if (q->ht)
710 + kfree(q->ht);
711 + if (q->dep)
712 + kfree(q->dep);
713 + if (q->next)
714 + kfree(q->next);
715 + if (q->allot)
716 + kfree(q->allot);
717 + if (q->hash)
718 + kfree(q->hash);
719 + if (q->qs)
720 + kfree(q->qs);
721 + return -ENOBUFS;
722 +}
723 +
724 +static void esfq_destroy(struct Qdisc *sch)
725 +{
726 + struct esfq_sched_data *q = qdisc_priv(sch);
727 + del_timer(&q->perturb_timer);
728 + if(q->ht)
729 + kfree(q->ht);
730 + if(q->dep)
731 + kfree(q->dep);
732 + if(q->next)
733 + kfree(q->next);
734 + if(q->allot)
735 + kfree(q->allot);
736 + if(q->hash)
737 + kfree(q->hash);
738 + if(q->qs)
739 + kfree(q->qs);
740 +}
741 +
742 +static int esfq_dump(struct Qdisc *sch, struct sk_buff *skb)
743 +{
744 + struct esfq_sched_data *q = qdisc_priv(sch);
745 + unsigned char *b = skb->tail;
746 + struct tc_esfq_qopt opt;
747 +
748 + opt.quantum = q->quantum;
749 + opt.perturb_period = q->perturb_period/HZ;
750 +
751 + opt.limit = q->limit;
752 + opt.divisor = q->hash_divisor;
753 + opt.flows = q->depth;
754 + opt.hash_kind = q->hash_kind;
755 +
756 + RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
757 +
758 + return skb->len;
759 +
760 +rtattr_failure:
761 + skb_trim(skb, b - skb->data);
762 + return -1;
763 +}
764 +
765 +static struct Qdisc_ops esfq_qdisc_ops =
766 +{
767 + .next = NULL,
768 + .cl_ops = NULL,
769 + .id = "esfq",
770 + .priv_size = sizeof(struct esfq_sched_data),
771 + .enqueue = esfq_enqueue,
772 + .dequeue = esfq_dequeue,
773 + .requeue = esfq_requeue,
774 + .drop = esfq_drop,
775 + .init = esfq_init,
776 + .reset = esfq_reset,
777 + .destroy = esfq_destroy,
778 + .change = NULL, /* esfq_change - needs more work */
779 + .dump = esfq_dump,
780 + .owner = THIS_MODULE,
781 +};
782 +
783 +static int __init esfq_module_init(void)
784 +{
785 + return register_qdisc(&esfq_qdisc_ops);
786 +}
787 +static void __exit esfq_module_exit(void)
788 +{
789 + unregister_qdisc(&esfq_qdisc_ops);
790 +}
791 +module_init(esfq_module_init)
792 +module_exit(esfq_module_exit)
793 +MODULE_LICENSE("GPL");
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