drivers/net/team/team_mode_loadbalance.c

   1 /*
   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
  20 struct lb_priv;
  21
  22 typedef 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
  29 struct lb_stats {
  30         u64 tx_bytes;
  31 };
  32
  33 struct lb_pcpu_stats {
  34         struct lb_stats hash_stats[LB_TX_HASHTABLE_SIZE];
  35         struct u64_stats_sync syncp;
  36 };
  37
  38 struct 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
  44 struct lb_port_mapping {
  45         struct team_port __rcu *port;
  46         struct team_option_inst_info *opt_inst_info;
  47 };
  48
  49 struct 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
  60 struct 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
  67 static struct lb_priv *get_lb_priv(struct team *team)
  68 {
  69         return (struct lb_priv *) &team->mode_priv;
  70 }
  71
  72 struct lb_port_priv {
  73         struct lb_stats __percpu *pcpu_stats;
  74         struct lb_stats_info stats_info;
  75 };
  76
  77 static 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
  88 static 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];
  99                 if (rcu_access_pointer(pm->port) == port) {
 100                         RCU_INIT_POINTER(pm->port, NULL);
 101                         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 */
 110 static 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 {
 115         int port_index = team_num_to_port_index(team, hash);
 116
 117         return team_get_port_by_index_rcu(team, port_index);
 118 }
 119
 120 /* Hash to port mapping select tx port */
 121 static 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 {
 126         return rcu_dereference_bh(LB_HTPM_PORT_BY_HASH(lb_priv, hash));
 127 }
 128
 129 struct lb_select_tx_port {
 130         char *name;
 131         lb_select_tx_port_func_t *func;
 132 };
 133
 134 static 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
 146 static 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
 160 static 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
 174 static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv,
 175                                     struct sk_buff *skb)
 176 {
 177         struct sk_filter *fp;
 178         uint32_t lhash;
 179         unsigned char *c;
 180
 181         fp = rcu_dereference_bh(lb_priv->fp);
 182         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
 189 static 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
 206 static bool lb_transmit(struct team *team, struct sk_buff *skb)
 207 {
 208         struct lb_priv *lb_priv = get_lb_priv(team);
 209         lb_select_tx_port_func_t *select_tx_port_func;
 210         struct team_port *port;
 211         unsigned char hash;
 212         unsigned int tx_bytes = skb->len;
 213
 214         hash = lb_get_skb_hash(lb_priv, skb);
 215         select_tx_port_func = rcu_dereference_bh(lb_priv->select_tx_port_func);
 216         port = select_tx_port_func(team, lb_priv, skb, hash);
 217         if (unlikely(!port))
 218                 goto drop;
 219         if (team_dev_queue_xmit(team, port, skb))
 220                 return false;
 221         lb_update_tx_stats(tx_bytes, lb_priv, get_lb_port_priv(port), hash);
 222         return true;
 223
 224 drop:
 225         dev_kfree_skb_any(skb);
 226         return false;
 227 }
 228
 229 static int lb_bpf_func_get(struct team *team, struct team_gsetter_ctx *ctx)
 230 {
 231         struct lb_priv *lb_priv = get_lb_priv(team);
 232
 233         if (!lb_priv->ex->orig_fprog) {
 234                 ctx->data.bin_val.len = 0;
 235                 ctx->data.bin_val.ptr = NULL;
 236                 return 0;
 237         }
 238         ctx->data.bin_val.len = lb_priv->ex->orig_fprog->len *
 239                                 sizeof(struct sock_filter);
 240         ctx->data.bin_val.ptr = lb_priv->ex->orig_fprog->filter;
 241         return 0;
 242 }
 243
 244 static int __fprog_create(struct sock_fprog **pfprog, u32 data_len,
 245                           const void *data)
 246 {
 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
 265 static void __fprog_destroy(struct sock_fprog *fprog)
 266 {
 267         kfree(fprog->filter);
 268         kfree(fprog);
 269 }
 270
 271 static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
 272 {
 273         struct lb_priv *lb_priv = get_lb_priv(team);
 274         struct sk_filter *fp = NULL;
 275         struct sk_filter *orig_fp;
 276         struct sock_fprog *fprog = NULL;
 277         int err;
 278
 279         if (ctx->data.bin_val.len) {
 280                 err = __fprog_create(&fprog, ctx->data.bin_val.len,
 281                                      ctx->data.bin_val.ptr);
 282                 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
 291         if (lb_priv->ex->orig_fprog) {
 292                 /* Clear old filter data */
 293                 __fprog_destroy(lb_priv->ex->orig_fprog);
 294                 orig_fp = rcu_dereference_protected(lb_priv->fp,
 295                                                 lockdep_is_held(&team->lock));
 296                 sk_unattached_filter_destroy(orig_fp);
 297         }
 298
 299         rcu_assign_pointer(lb_priv->fp, fp);
 300         lb_priv->ex->orig_fprog = fprog;
 301         return 0;
 302 }
 303
 304 static int lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
 305 {
 306         struct lb_priv *lb_priv = get_lb_priv(team);
 307         lb_select_tx_port_func_t *func;
 308         char *name;
 309
 310         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);
 313         BUG_ON(!name);
 314         ctx->data.str_val = name;
 315         return 0;
 316 }
 317
 318 static 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
 330 static 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
 340 static 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
 352 static 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) {
 360                 if (ctx->data.u32_val == port->dev->ifindex &&
 361                     team_port_enabled(port)) {
 362                         rcu_assign_pointer(LB_HTPM_PORT_BY_HASH(lb_priv, hash),
 363                                            port);
 364                         return 0;
 365                 }
 366         }
 367         return -ENODEV;
 368 }
 369
 370 static 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
 380 static 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
 390 static 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
 400 static 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
 410 static 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
 416 static 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
 427 static 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
 441 static 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
 500 static 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
 509 static 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);
 523         return 0;
 524 }
 525
 526 static 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         },
 533         {
 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         },
 567 };
 568
 569 static int lb_init(struct team *team)
 570 {
 571         struct lb_priv *lb_priv = get_lb_priv(team);
 572         lb_select_tx_port_func_t *func;
 573         int i, 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         for_each_possible_cpu(i) {
 592                 struct lb_pcpu_stats *team_lb_stats;
 593                 team_lb_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 594                 u64_stats_init(&team_lb_stats->syncp);
 595         }
 596
 597
 598         INIT_DELAYED_WORK(&lb_priv->ex->stats.refresh_dw, lb_stats_refresh);
 599
 600         err = team_options_register(team, lb_options, ARRAY_SIZE(lb_options));
 601         if (err)
 602                 goto err_options_register;
 603         return 0;
 604
 605 err_options_register:
 606         free_percpu(lb_priv->pcpu_stats);
 607 err_alloc_pcpu_stats:
 608         kfree(lb_priv->ex);
 609         return err;
 610 }
 611
 612 static void lb_exit(struct team *team)
 613 {
 614         struct lb_priv *lb_priv = get_lb_priv(team);
 615
 616         team_options_unregister(team, lb_options,
 617                                 ARRAY_SIZE(lb_options));
 618         cancel_delayed_work_sync(&lb_priv->ex->stats.refresh_dw);
 619         free_percpu(lb_priv->pcpu_stats);
 620         kfree(lb_priv->ex);
 621 }
 622
 623 static int lb_port_enter(struct team *team, struct team_port *port)
 624 {
 625         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 626
 627         lb_port_priv->pcpu_stats = alloc_percpu(struct lb_stats);
 628         if (!lb_port_priv->pcpu_stats)
 629                 return -ENOMEM;
 630         return 0;
 631 }
 632
 633 static void lb_port_leave(struct team *team, struct team_port *port)
 634 {
 635         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 636
 637         free_percpu(lb_port_priv->pcpu_stats);
 638 }
 639
 640 static void lb_port_disabled(struct team *team, struct team_port *port)
 641 {
 642         lb_tx_hash_to_port_mapping_null_port(team, port);
 643 }
 644
 645 static const struct team_mode_ops lb_mode_ops = {
 646         .init                   = lb_init,
 647         .exit                   = lb_exit,
 648         .port_enter             = lb_port_enter,
 649         .port_leave             = lb_port_leave,
 650         .port_disabled          = lb_port_disabled,
 651         .transmit               = lb_transmit,
 652 };
 653
 654 static const struct team_mode lb_mode = {
 655         .kind           = "loadbalance",
 656         .owner          = THIS_MODULE,
 657         .priv_size      = sizeof(struct lb_priv),
 658         .port_priv_size = sizeof(struct lb_port_priv),
 659         .ops            = &lb_mode_ops,
 660 };
 661
 662 static int __init lb_init_module(void)
 663 {
 664         return team_mode_register(&lb_mode);
 665 }
 666
 667 static void __exit lb_cleanup_module(void)
 668 {
 669         team_mode_unregister(&lb_mode);
 670 }
 671
 672 module_init(lb_init_module);
 673 module_exit(lb_cleanup_module);
 674
 675 MODULE_LICENSE("GPL v2");
 676 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
 677 MODULE_DESCRIPTION("Load-balancing mode for team");
 678 MODULE_ALIAS("team-mode-loadbalance");