blob: 829a9cd2b4dac5257f2deb8eabd39c0210ffc8bc [file] [log] [blame]
Jiri Pirko01d7f302012-04-04 12:16:27 +00001/*
2 * drivers/net/team/team_mode_loadbalance.c - Load-balancing mode for team
3 * Copyright (c) 2012 Jiri Pirko <jpirko@redhat.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 */
10
11#include <linux/kernel.h>
12#include <linux/types.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/errno.h>
16#include <linux/netdevice.h>
17#include <linux/filter.h>
18#include <linux/if_team.h>
19
Jiri Pirkoab8250d2012-06-19 05:54:17 +000020struct lb_priv;
21
22typedef struct team_port *lb_select_tx_port_func_t(struct team *,
23 struct lb_priv *,
24 struct sk_buff *,
25 unsigned char);
26
27#define LB_TX_HASHTABLE_SIZE 256 /* hash is a char */
28
29struct lb_stats {
30 u64 tx_bytes;
Jiri Pirko01d7f302012-04-04 12:16:27 +000031};
32
Jiri Pirkoab8250d2012-06-19 05:54:17 +000033struct lb_pcpu_stats {
34 struct lb_stats hash_stats[LB_TX_HASHTABLE_SIZE];
35 struct u64_stats_sync syncp;
36};
37
38struct lb_stats_info {
39 struct lb_stats stats;
40 struct lb_stats last_stats;
41 struct team_option_inst_info *opt_inst_info;
42};
43
44struct lb_port_mapping {
45 struct team_port __rcu *port;
46 struct team_option_inst_info *opt_inst_info;
47};
48
49struct lb_priv_ex {
50 struct team *team;
51 struct lb_port_mapping tx_hash_to_port_mapping[LB_TX_HASHTABLE_SIZE];
52 struct sock_fprog *orig_fprog;
53 struct {
54 unsigned int refresh_interval; /* in tenths of second */
55 struct delayed_work refresh_dw;
56 struct lb_stats_info info[LB_TX_HASHTABLE_SIZE];
57 } stats;
58};
59
60struct lb_priv {
61 struct sk_filter __rcu *fp;
62 lb_select_tx_port_func_t __rcu *select_tx_port_func;
63 struct lb_pcpu_stats __percpu *pcpu_stats;
64 struct lb_priv_ex *ex; /* priv extension */
65};
66
67static struct lb_priv *get_lb_priv(struct team *team)
Jiri Pirko01d7f302012-04-04 12:16:27 +000068{
69 return (struct lb_priv *) &team->mode_priv;
70}
71
Jiri Pirkoab8250d2012-06-19 05:54:17 +000072struct lb_port_priv {
73 struct lb_stats __percpu *pcpu_stats;
74 struct lb_stats_info stats_info;
75};
76
77static struct lb_port_priv *get_lb_port_priv(struct team_port *port)
78{
79 return (struct lb_port_priv *) &port->mode_priv;
80}
81
82#define LB_HTPM_PORT_BY_HASH(lp_priv, hash) \
83 (lb_priv)->ex->tx_hash_to_port_mapping[hash].port
84
85#define LB_HTPM_OPT_INST_INFO_BY_HASH(lp_priv, hash) \
86 (lb_priv)->ex->tx_hash_to_port_mapping[hash].opt_inst_info
87
88static void lb_tx_hash_to_port_mapping_null_port(struct team *team,
89 struct team_port *port)
90{
91 struct lb_priv *lb_priv = get_lb_priv(team);
92 bool changed = false;
93 int i;
94
95 for (i = 0; i < LB_TX_HASHTABLE_SIZE; i++) {
96 struct lb_port_mapping *pm;
97
98 pm = &lb_priv->ex->tx_hash_to_port_mapping[i];
Jiri Pirko6dab0152012-06-20 08:39:39 +000099 if (rcu_access_pointer(pm->port) == port) {
100 RCU_INIT_POINTER(pm->port, NULL);
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000101 team_option_inst_set_change(pm->opt_inst_info);
102 changed = true;
103 }
104 }
105 if (changed)
106 team_options_change_check(team);
107}
108
109/* Basic tx selection based solely by hash */
110static struct team_port *lb_hash_select_tx_port(struct team *team,
111 struct lb_priv *lb_priv,
112 struct sk_buff *skb,
113 unsigned char hash)
114{
Jiri Pirko735d3812013-06-10 17:42:25 +0200115 int port_index = team_num_to_port_index(team, hash);
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000116
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000117 return team_get_port_by_index_rcu(team, port_index);
118}
119
120/* Hash to port mapping select tx port */
121static struct team_port *lb_htpm_select_tx_port(struct team *team,
122 struct lb_priv *lb_priv,
123 struct sk_buff *skb,
124 unsigned char hash)
125{
Jiri Pirkod1904fb2012-06-19 05:54:21 +0000126 return rcu_dereference_bh(LB_HTPM_PORT_BY_HASH(lb_priv, hash));
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000127}
128
129struct lb_select_tx_port {
130 char *name;
131 lb_select_tx_port_func_t *func;
132};
133
134static const struct lb_select_tx_port lb_select_tx_port_list[] = {
135 {
136 .name = "hash",
137 .func = lb_hash_select_tx_port,
138 },
139 {
140 .name = "hash_to_port_mapping",
141 .func = lb_htpm_select_tx_port,
142 },
143};
144#define LB_SELECT_TX_PORT_LIST_COUNT ARRAY_SIZE(lb_select_tx_port_list)
145
146static char *lb_select_tx_port_get_name(lb_select_tx_port_func_t *func)
147{
148 int i;
149
150 for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
151 const struct lb_select_tx_port *item;
152
153 item = &lb_select_tx_port_list[i];
154 if (item->func == func)
155 return item->name;
156 }
157 return NULL;
158}
159
160static lb_select_tx_port_func_t *lb_select_tx_port_get_func(const char *name)
161{
162 int i;
163
164 for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
165 const struct lb_select_tx_port *item;
166
167 item = &lb_select_tx_port_list[i];
168 if (!strcmp(item->name, name))
169 return item->func;
170 }
171 return NULL;
172}
173
174static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv,
175 struct sk_buff *skb)
Jiri Pirko01d7f302012-04-04 12:16:27 +0000176{
177 struct sk_filter *fp;
Jiri Pirko596e2022012-06-19 05:54:06 +0000178 uint32_t lhash;
179 unsigned char *c;
180
Jiri Pirkod1904fb2012-06-19 05:54:21 +0000181 fp = rcu_dereference_bh(lb_priv->fp);
Jiri Pirko596e2022012-06-19 05:54:06 +0000182 if (unlikely(!fp))
183 return 0;
184 lhash = SK_RUN_FILTER(fp, skb);
185 c = (char *) &lhash;
186 return c[0] ^ c[1] ^ c[2] ^ c[3];
187}
188
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000189static void lb_update_tx_stats(unsigned int tx_bytes, struct lb_priv *lb_priv,
190 struct lb_port_priv *lb_port_priv,
191 unsigned char hash)
192{
193 struct lb_pcpu_stats *pcpu_stats;
194 struct lb_stats *port_stats;
195 struct lb_stats *hash_stats;
196
197 pcpu_stats = this_cpu_ptr(lb_priv->pcpu_stats);
198 port_stats = this_cpu_ptr(lb_port_priv->pcpu_stats);
199 hash_stats = &pcpu_stats->hash_stats[hash];
200 u64_stats_update_begin(&pcpu_stats->syncp);
201 port_stats->tx_bytes += tx_bytes;
202 hash_stats->tx_bytes += tx_bytes;
203 u64_stats_update_end(&pcpu_stats->syncp);
204}
205
Jiri Pirko596e2022012-06-19 05:54:06 +0000206static bool lb_transmit(struct team *team, struct sk_buff *skb)
207{
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000208 struct lb_priv *lb_priv = get_lb_priv(team);
209 lb_select_tx_port_func_t *select_tx_port_func;
Jiri Pirko01d7f302012-04-04 12:16:27 +0000210 struct team_port *port;
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000211 unsigned char hash;
212 unsigned int tx_bytes = skb->len;
Jiri Pirko01d7f302012-04-04 12:16:27 +0000213
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000214 hash = lb_get_skb_hash(lb_priv, skb);
Jiri Pirkod1904fb2012-06-19 05:54:21 +0000215 select_tx_port_func = rcu_dereference_bh(lb_priv->select_tx_port_func);
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000216 port = select_tx_port_func(team, lb_priv, skb, hash);
Jiri Pirko01d7f302012-04-04 12:16:27 +0000217 if (unlikely(!port))
218 goto drop;
Jiri Pirkobd2d0832012-07-17 05:22:36 +0000219 if (team_dev_queue_xmit(team, port, skb))
Jiri Pirko01d7f302012-04-04 12:16:27 +0000220 return false;
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000221 lb_update_tx_stats(tx_bytes, lb_priv, get_lb_port_priv(port), hash);
Jiri Pirko01d7f302012-04-04 12:16:27 +0000222 return true;
223
224drop:
225 dev_kfree_skb_any(skb);
226 return false;
227}
228
Jiri Pirko80f7c662012-04-10 05:15:42 +0000229static int lb_bpf_func_get(struct team *team, struct team_gsetter_ctx *ctx)
Jiri Pirko01d7f302012-04-04 12:16:27 +0000230{
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000231 struct lb_priv *lb_priv = get_lb_priv(team);
232
233 if (!lb_priv->ex->orig_fprog) {
Jiri Pirko80f7c662012-04-10 05:15:42 +0000234 ctx->data.bin_val.len = 0;
235 ctx->data.bin_val.ptr = NULL;
Jiri Pirko01d7f302012-04-04 12:16:27 +0000236 return 0;
Jiri Pirko80f7c662012-04-10 05:15:42 +0000237 }
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000238 ctx->data.bin_val.len = lb_priv->ex->orig_fprog->len *
Jiri Pirko80f7c662012-04-10 05:15:42 +0000239 sizeof(struct sock_filter);
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000240 ctx->data.bin_val.ptr = lb_priv->ex->orig_fprog->filter;
Jiri Pirko01d7f302012-04-04 12:16:27 +0000241 return 0;
242}
243
244static int __fprog_create(struct sock_fprog **pfprog, u32 data_len,
Jiri Pirko80f7c662012-04-10 05:15:42 +0000245 const void *data)
Jiri Pirko01d7f302012-04-04 12:16:27 +0000246{
247 struct sock_fprog *fprog;
248 struct sock_filter *filter = (struct sock_filter *) data;
249
250 if (data_len % sizeof(struct sock_filter))
251 return -EINVAL;
252 fprog = kmalloc(sizeof(struct sock_fprog), GFP_KERNEL);
253 if (!fprog)
254 return -ENOMEM;
255 fprog->filter = kmemdup(filter, data_len, GFP_KERNEL);
256 if (!fprog->filter) {
257 kfree(fprog);
258 return -ENOMEM;
259 }
260 fprog->len = data_len / sizeof(struct sock_filter);
261 *pfprog = fprog;
262 return 0;
263}
264
265static void __fprog_destroy(struct sock_fprog *fprog)
266{
267 kfree(fprog->filter);
268 kfree(fprog);
269}
270
Jiri Pirko80f7c662012-04-10 05:15:42 +0000271static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
Jiri Pirko01d7f302012-04-04 12:16:27 +0000272{
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000273 struct lb_priv *lb_priv = get_lb_priv(team);
Jiri Pirko01d7f302012-04-04 12:16:27 +0000274 struct sk_filter *fp = NULL;
Jiri Pirko6dab0152012-06-20 08:39:39 +0000275 struct sk_filter *orig_fp;
Jiri Pirko01d7f302012-04-04 12:16:27 +0000276 struct sock_fprog *fprog = NULL;
277 int err;
278
Jiri Pirko80f7c662012-04-10 05:15:42 +0000279 if (ctx->data.bin_val.len) {
280 err = __fprog_create(&fprog, ctx->data.bin_val.len,
281 ctx->data.bin_val.ptr);
Jiri Pirko01d7f302012-04-04 12:16:27 +0000282 if (err)
283 return err;
284 err = sk_unattached_filter_create(&fp, fprog);
285 if (err) {
286 __fprog_destroy(fprog);
287 return err;
288 }
289 }
290
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000291 if (lb_priv->ex->orig_fprog) {
Jiri Pirko01d7f302012-04-04 12:16:27 +0000292 /* Clear old filter data */
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000293 __fprog_destroy(lb_priv->ex->orig_fprog);
Jiri Pirko6dab0152012-06-20 08:39:39 +0000294 orig_fp = rcu_dereference_protected(lb_priv->fp,
295 lockdep_is_held(&team->lock));
296 sk_unattached_filter_destroy(orig_fp);
Jiri Pirko01d7f302012-04-04 12:16:27 +0000297 }
298
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000299 rcu_assign_pointer(lb_priv->fp, fp);
300 lb_priv->ex->orig_fprog = fprog;
301 return 0;
302}
303
304static int lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
305{
306 struct lb_priv *lb_priv = get_lb_priv(team);
Jiri Pirko6dab0152012-06-20 08:39:39 +0000307 lb_select_tx_port_func_t *func;
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000308 char *name;
309
Jiri Pirko6dab0152012-06-20 08:39:39 +0000310 func = rcu_dereference_protected(lb_priv->select_tx_port_func,
311 lockdep_is_held(&team->lock));
312 name = lb_select_tx_port_get_name(func);
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000313 BUG_ON(!name);
314 ctx->data.str_val = name;
315 return 0;
316}
317
318static int lb_tx_method_set(struct team *team, struct team_gsetter_ctx *ctx)
319{
320 struct lb_priv *lb_priv = get_lb_priv(team);
321 lb_select_tx_port_func_t *func;
322
323 func = lb_select_tx_port_get_func(ctx->data.str_val);
324 if (!func)
325 return -EINVAL;
326 rcu_assign_pointer(lb_priv->select_tx_port_func, func);
327 return 0;
328}
329
330static int lb_tx_hash_to_port_mapping_init(struct team *team,
331 struct team_option_inst_info *info)
332{
333 struct lb_priv *lb_priv = get_lb_priv(team);
334 unsigned char hash = info->array_index;
335
336 LB_HTPM_OPT_INST_INFO_BY_HASH(lb_priv, hash) = info;
337 return 0;
338}
339
340static int lb_tx_hash_to_port_mapping_get(struct team *team,
341 struct team_gsetter_ctx *ctx)
342{
343 struct lb_priv *lb_priv = get_lb_priv(team);
344 struct team_port *port;
345 unsigned char hash = ctx->info->array_index;
346
347 port = LB_HTPM_PORT_BY_HASH(lb_priv, hash);
348 ctx->data.u32_val = port ? port->dev->ifindex : 0;
349 return 0;
350}
351
352static int lb_tx_hash_to_port_mapping_set(struct team *team,
353 struct team_gsetter_ctx *ctx)
354{
355 struct lb_priv *lb_priv = get_lb_priv(team);
356 struct team_port *port;
357 unsigned char hash = ctx->info->array_index;
358
359 list_for_each_entry(port, &team->port_list, list) {
Jiri Pirko52a4fd72012-06-26 06:52:46 +0000360 if (ctx->data.u32_val == port->dev->ifindex &&
361 team_port_enabled(port)) {
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000362 rcu_assign_pointer(LB_HTPM_PORT_BY_HASH(lb_priv, hash),
363 port);
364 return 0;
365 }
366 }
367 return -ENODEV;
368}
369
370static int lb_hash_stats_init(struct team *team,
371 struct team_option_inst_info *info)
372{
373 struct lb_priv *lb_priv = get_lb_priv(team);
374 unsigned char hash = info->array_index;
375
376 lb_priv->ex->stats.info[hash].opt_inst_info = info;
377 return 0;
378}
379
380static int lb_hash_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
381{
382 struct lb_priv *lb_priv = get_lb_priv(team);
383 unsigned char hash = ctx->info->array_index;
384
385 ctx->data.bin_val.ptr = &lb_priv->ex->stats.info[hash].stats;
386 ctx->data.bin_val.len = sizeof(struct lb_stats);
387 return 0;
388}
389
390static int lb_port_stats_init(struct team *team,
391 struct team_option_inst_info *info)
392{
393 struct team_port *port = info->port;
394 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
395
396 lb_port_priv->stats_info.opt_inst_info = info;
397 return 0;
398}
399
400static int lb_port_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
401{
402 struct team_port *port = ctx->info->port;
403 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
404
405 ctx->data.bin_val.ptr = &lb_port_priv->stats_info.stats;
406 ctx->data.bin_val.len = sizeof(struct lb_stats);
407 return 0;
408}
409
410static void __lb_stats_info_refresh_prepare(struct lb_stats_info *s_info)
411{
412 memcpy(&s_info->last_stats, &s_info->stats, sizeof(struct lb_stats));
413 memset(&s_info->stats, 0, sizeof(struct lb_stats));
414}
415
416static bool __lb_stats_info_refresh_check(struct lb_stats_info *s_info,
417 struct team *team)
418{
419 if (memcmp(&s_info->last_stats, &s_info->stats,
420 sizeof(struct lb_stats))) {
421 team_option_inst_set_change(s_info->opt_inst_info);
422 return true;
423 }
424 return false;
425}
426
427static void __lb_one_cpu_stats_add(struct lb_stats *acc_stats,
428 struct lb_stats *cpu_stats,
429 struct u64_stats_sync *syncp)
430{
431 unsigned int start;
432 struct lb_stats tmp;
433
434 do {
435 start = u64_stats_fetch_begin_bh(syncp);
436 tmp.tx_bytes = cpu_stats->tx_bytes;
437 } while (u64_stats_fetch_retry_bh(syncp, start));
438 acc_stats->tx_bytes += tmp.tx_bytes;
439}
440
441static void lb_stats_refresh(struct work_struct *work)
442{
443 struct team *team;
444 struct lb_priv *lb_priv;
445 struct lb_priv_ex *lb_priv_ex;
446 struct lb_pcpu_stats *pcpu_stats;
447 struct lb_stats *stats;
448 struct lb_stats_info *s_info;
449 struct team_port *port;
450 bool changed = false;
451 int i;
452 int j;
453
454 lb_priv_ex = container_of(work, struct lb_priv_ex,
455 stats.refresh_dw.work);
456
457 team = lb_priv_ex->team;
458 lb_priv = get_lb_priv(team);
459
460 if (!mutex_trylock(&team->lock)) {
461 schedule_delayed_work(&lb_priv_ex->stats.refresh_dw, 0);
462 return;
463 }
464
465 for (j = 0; j < LB_TX_HASHTABLE_SIZE; j++) {
466 s_info = &lb_priv->ex->stats.info[j];
467 __lb_stats_info_refresh_prepare(s_info);
468 for_each_possible_cpu(i) {
469 pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
470 stats = &pcpu_stats->hash_stats[j];
471 __lb_one_cpu_stats_add(&s_info->stats, stats,
472 &pcpu_stats->syncp);
473 }
474 changed |= __lb_stats_info_refresh_check(s_info, team);
475 }
476
477 list_for_each_entry(port, &team->port_list, list) {
478 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
479
480 s_info = &lb_port_priv->stats_info;
481 __lb_stats_info_refresh_prepare(s_info);
482 for_each_possible_cpu(i) {
483 pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
484 stats = per_cpu_ptr(lb_port_priv->pcpu_stats, i);
485 __lb_one_cpu_stats_add(&s_info->stats, stats,
486 &pcpu_stats->syncp);
487 }
488 changed |= __lb_stats_info_refresh_check(s_info, team);
489 }
490
491 if (changed)
492 team_options_change_check(team);
493
494 schedule_delayed_work(&lb_priv_ex->stats.refresh_dw,
495 (lb_priv_ex->stats.refresh_interval * HZ) / 10);
496
497 mutex_unlock(&team->lock);
498}
499
500static int lb_stats_refresh_interval_get(struct team *team,
501 struct team_gsetter_ctx *ctx)
502{
503 struct lb_priv *lb_priv = get_lb_priv(team);
504
505 ctx->data.u32_val = lb_priv->ex->stats.refresh_interval;
506 return 0;
507}
508
509static int lb_stats_refresh_interval_set(struct team *team,
510 struct team_gsetter_ctx *ctx)
511{
512 struct lb_priv *lb_priv = get_lb_priv(team);
513 unsigned int interval;
514
515 interval = ctx->data.u32_val;
516 if (lb_priv->ex->stats.refresh_interval == interval)
517 return 0;
518 lb_priv->ex->stats.refresh_interval = interval;
519 if (interval)
520 schedule_delayed_work(&lb_priv->ex->stats.refresh_dw, 0);
521 else
522 cancel_delayed_work(&lb_priv->ex->stats.refresh_dw);
Jiri Pirko01d7f302012-04-04 12:16:27 +0000523 return 0;
524}
525
526static const struct team_option lb_options[] = {
527 {
528 .name = "bpf_hash_func",
529 .type = TEAM_OPTION_TYPE_BINARY,
530 .getter = lb_bpf_func_get,
531 .setter = lb_bpf_func_set,
532 },
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000533 {
534 .name = "lb_tx_method",
535 .type = TEAM_OPTION_TYPE_STRING,
536 .getter = lb_tx_method_get,
537 .setter = lb_tx_method_set,
538 },
539 {
540 .name = "lb_tx_hash_to_port_mapping",
541 .array_size = LB_TX_HASHTABLE_SIZE,
542 .type = TEAM_OPTION_TYPE_U32,
543 .init = lb_tx_hash_to_port_mapping_init,
544 .getter = lb_tx_hash_to_port_mapping_get,
545 .setter = lb_tx_hash_to_port_mapping_set,
546 },
547 {
548 .name = "lb_hash_stats",
549 .array_size = LB_TX_HASHTABLE_SIZE,
550 .type = TEAM_OPTION_TYPE_BINARY,
551 .init = lb_hash_stats_init,
552 .getter = lb_hash_stats_get,
553 },
554 {
555 .name = "lb_port_stats",
556 .per_port = true,
557 .type = TEAM_OPTION_TYPE_BINARY,
558 .init = lb_port_stats_init,
559 .getter = lb_port_stats_get,
560 },
561 {
562 .name = "lb_stats_refresh_interval",
563 .type = TEAM_OPTION_TYPE_U32,
564 .getter = lb_stats_refresh_interval_get,
565 .setter = lb_stats_refresh_interval_set,
566 },
Jiri Pirko01d7f302012-04-04 12:16:27 +0000567};
568
Jiri Pirkocade4552012-04-10 05:15:46 +0000569static int lb_init(struct team *team)
Jiri Pirko01d7f302012-04-04 12:16:27 +0000570{
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000571 struct lb_priv *lb_priv = get_lb_priv(team);
572 lb_select_tx_port_func_t *func;
573 int err;
574
575 /* set default tx port selector */
576 func = lb_select_tx_port_get_func("hash");
577 BUG_ON(!func);
578 rcu_assign_pointer(lb_priv->select_tx_port_func, func);
579
580 lb_priv->ex = kzalloc(sizeof(*lb_priv->ex), GFP_KERNEL);
581 if (!lb_priv->ex)
582 return -ENOMEM;
583 lb_priv->ex->team = team;
584
585 lb_priv->pcpu_stats = alloc_percpu(struct lb_pcpu_stats);
586 if (!lb_priv->pcpu_stats) {
587 err = -ENOMEM;
588 goto err_alloc_pcpu_stats;
589 }
590
591 INIT_DELAYED_WORK(&lb_priv->ex->stats.refresh_dw, lb_stats_refresh);
592
593 err = team_options_register(team, lb_options, ARRAY_SIZE(lb_options));
594 if (err)
595 goto err_options_register;
596 return 0;
597
598err_options_register:
599 free_percpu(lb_priv->pcpu_stats);
600err_alloc_pcpu_stats:
601 kfree(lb_priv->ex);
602 return err;
Jiri Pirko01d7f302012-04-04 12:16:27 +0000603}
604
Jiri Pirkocade4552012-04-10 05:15:46 +0000605static void lb_exit(struct team *team)
Jiri Pirko01d7f302012-04-04 12:16:27 +0000606{
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000607 struct lb_priv *lb_priv = get_lb_priv(team);
608
Jiri Pirko01d7f302012-04-04 12:16:27 +0000609 team_options_unregister(team, lb_options,
610 ARRAY_SIZE(lb_options));
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000611 cancel_delayed_work_sync(&lb_priv->ex->stats.refresh_dw);
612 free_percpu(lb_priv->pcpu_stats);
613 kfree(lb_priv->ex);
614}
615
616static int lb_port_enter(struct team *team, struct team_port *port)
617{
618 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
619
620 lb_port_priv->pcpu_stats = alloc_percpu(struct lb_stats);
621 if (!lb_port_priv->pcpu_stats)
622 return -ENOMEM;
623 return 0;
624}
625
626static void lb_port_leave(struct team *team, struct team_port *port)
627{
628 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
629
630 free_percpu(lb_port_priv->pcpu_stats);
631}
632
633static void lb_port_disabled(struct team *team, struct team_port *port)
634{
635 lb_tx_hash_to_port_mapping_null_port(team, port);
Jiri Pirko01d7f302012-04-04 12:16:27 +0000636}
637
Jiri Pirko01d7f302012-04-04 12:16:27 +0000638static const struct team_mode_ops lb_mode_ops = {
639 .init = lb_init,
640 .exit = lb_exit,
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000641 .port_enter = lb_port_enter,
642 .port_leave = lb_port_leave,
643 .port_disabled = lb_port_disabled,
Jiri Pirko01d7f302012-04-04 12:16:27 +0000644 .transmit = lb_transmit,
Jiri Pirko01d7f302012-04-04 12:16:27 +0000645};
646
Jiri Pirko04027882012-06-19 05:54:03 +0000647static const struct team_mode lb_mode = {
Jiri Pirko01d7f302012-04-04 12:16:27 +0000648 .kind = "loadbalance",
649 .owner = THIS_MODULE,
650 .priv_size = sizeof(struct lb_priv),
Jiri Pirkoab8250d2012-06-19 05:54:17 +0000651 .port_priv_size = sizeof(struct lb_port_priv),
Jiri Pirko01d7f302012-04-04 12:16:27 +0000652 .ops = &lb_mode_ops,
653};
654
655static int __init lb_init_module(void)
656{
657 return team_mode_register(&lb_mode);
658}
659
660static void __exit lb_cleanup_module(void)
661{
662 team_mode_unregister(&lb_mode);
663}
664
665module_init(lb_init_module);
666module_exit(lb_cleanup_module);
667
668MODULE_LICENSE("GPL v2");
669MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
670MODULE_DESCRIPTION("Load-balancing mode for team");
671MODULE_ALIAS("team-mode-loadbalance");