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;
 116
 117         port_index = hash % team->en_port_count;
 118         return team_get_port_by_index_rcu(team, port_index);
 119 }
 120
 121 /* Hash to port mapping select tx port */
 122 static struct team_port *lb_htpm_select_tx_port(struct team *team,
 123                                                 struct lb_priv *lb_priv,
 124                                                 struct sk_buff *skb,
 125                                                 unsigned char hash)
 126 {
 127         return rcu_dereference_bh(LB_HTPM_PORT_BY_HASH(lb_priv, hash));
 128 }
 129
 130 struct lb_select_tx_port {
 131         char *name;
 132         lb_select_tx_port_func_t *func;
 133 };
 134
 135 static const struct lb_select_tx_port lb_select_tx_port_list[] = {
 136         {
 137                 .name = "hash",
 138                 .func = lb_hash_select_tx_port,
 139         },
 140         {
 141                 .name = "hash_to_port_mapping",
 142                 .func = lb_htpm_select_tx_port,
 143         },
 144 };
 145 #define LB_SELECT_TX_PORT_LIST_COUNT ARRAY_SIZE(lb_select_tx_port_list)
 146
 147 static char *lb_select_tx_port_get_name(lb_select_tx_port_func_t *func)
 148 {
 149         int i;
 150
 151         for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
 152                 const struct lb_select_tx_port *item;
 153
 154                 item = &lb_select_tx_port_list[i];
 155                 if (item->func == func)
 156                         return item->name;
 157         }
 158         return NULL;
 159 }
 160
 161 static lb_select_tx_port_func_t *lb_select_tx_port_get_func(const char *name)
 162 {
 163         int i;
 164
 165         for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
 166                 const struct lb_select_tx_port *item;
 167
 168                 item = &lb_select_tx_port_list[i];
 169                 if (!strcmp(item->name, name))
 170                         return item->func;
 171         }
 172         return NULL;
 173 }
 174
 175 static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv,
 176                                     struct sk_buff *skb)
 177 {
 178         struct sk_filter *fp;
 179         uint32_t lhash;
 180         unsigned char *c;
 181
 182         fp = rcu_dereference_bh(lb_priv->fp);
 183         if (unlikely(!fp))
 184                 return 0;
 185         lhash = SK_RUN_FILTER(fp, skb);
 186         c = (char *) &lhash;
 187         return c[0] ^ c[1] ^ c[2] ^ c[3];
 188 }
 189
 190 static void lb_update_tx_stats(unsigned int tx_bytes, struct lb_priv *lb_priv,
 191                                struct lb_port_priv *lb_port_priv,
 192                                unsigned char hash)
 193 {
 194         struct lb_pcpu_stats *pcpu_stats;
 195         struct lb_stats *port_stats;
 196         struct lb_stats *hash_stats;
 197
 198         pcpu_stats = this_cpu_ptr(lb_priv->pcpu_stats);
 199         port_stats = this_cpu_ptr(lb_port_priv->pcpu_stats);
 200         hash_stats = &pcpu_stats->hash_stats[hash];
 201         u64_stats_update_begin(&pcpu_stats->syncp);
 202         port_stats->tx_bytes += tx_bytes;
 203         hash_stats->tx_bytes += tx_bytes;
 204         u64_stats_update_end(&pcpu_stats->syncp);
 205 }
 206
 207 static bool lb_transmit(struct team *team, struct sk_buff *skb)
 208 {
 209         struct lb_priv *lb_priv = get_lb_priv(team);
 210         lb_select_tx_port_func_t *select_tx_port_func;
 211         struct team_port *port;
 212         unsigned char hash;
 213         unsigned int tx_bytes = skb->len;
 214
 215         hash = lb_get_skb_hash(lb_priv, skb);
 216         select_tx_port_func = rcu_dereference_bh(lb_priv->select_tx_port_func);
 217         port = select_tx_port_func(team, lb_priv, skb, hash);
 218         if (unlikely(!port))
 219                 goto drop;
 220         if (team_dev_queue_xmit(team, port, skb))
 221                 return false;
 222         lb_update_tx_stats(tx_bytes, lb_priv, get_lb_port_priv(port), hash);
 223         return true;
 224
 225 drop:
 226         dev_kfree_skb_any(skb);
 227         return false;
 228 }
 229
 230 static int lb_bpf_func_get(struct team *team, struct team_gsetter_ctx *ctx)
 231 {
 232         struct lb_priv *lb_priv = get_lb_priv(team);
 233
 234         if (!lb_priv->ex->orig_fprog) {
 235                 ctx->data.bin_val.len = 0;
 236                 ctx->data.bin_val.ptr = NULL;
 237                 return 0;
 238         }
 239         ctx->data.bin_val.len = lb_priv->ex->orig_fprog->len *
 240                                 sizeof(struct sock_filter);
 241         ctx->data.bin_val.ptr = lb_priv->ex->orig_fprog->filter;
 242         return 0;
 243 }
 244
 245 static int __fprog_create(struct sock_fprog **pfprog, u32 data_len,
 246                           const void *data)
 247 {
 248         struct sock_fprog *fprog;
 249         struct sock_filter *filter = (struct sock_filter *) data;
 250
 251         if (data_len % sizeof(struct sock_filter))
 252                 return -EINVAL;
 253         fprog = kmalloc(sizeof(struct sock_fprog), GFP_KERNEL);
 254         if (!fprog)
 255                 return -ENOMEM;
 256         fprog->filter = kmemdup(filter, data_len, GFP_KERNEL);
 257         if (!fprog->filter) {
 258                 kfree(fprog);
 259                 return -ENOMEM;
 260         }
 261         fprog->len = data_len / sizeof(struct sock_filter);
 262         *pfprog = fprog;
 263         return 0;
 264 }
 265
 266 static void __fprog_destroy(struct sock_fprog *fprog)
 267 {
 268         kfree(fprog->filter);
 269         kfree(fprog);
 270 }
 271
 272 static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
 273 {
 274         struct lb_priv *lb_priv = get_lb_priv(team);
 275         struct sk_filter *fp = NULL;
 276         struct sk_filter *orig_fp;
 277         struct sock_fprog *fprog = NULL;
 278         int err;
 279
 280         if (ctx->data.bin_val.len) {
 281                 err = __fprog_create(&fprog, ctx->data.bin_val.len,
 282                                      ctx->data.bin_val.ptr);
 283                 if (err)
 284                         return err;
 285                 err = sk_unattached_filter_create(&fp, fprog);
 286                 if (err) {
 287                         __fprog_destroy(fprog);
 288                         return err;
 289                 }
 290         }
 291
 292         if (lb_priv->ex->orig_fprog) {
 293                 /* Clear old filter data */
 294                 __fprog_destroy(lb_priv->ex->orig_fprog);
 295                 orig_fp = rcu_dereference_protected(lb_priv->fp,
 296                                                 lockdep_is_held(&team->lock));
 297                 sk_unattached_filter_destroy(orig_fp);
 298         }
 299
 300         rcu_assign_pointer(lb_priv->fp, fp);
 301         lb_priv->ex->orig_fprog = fprog;
 302         return 0;
 303 }
 304
 305 static int lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
 306 {
 307         struct lb_priv *lb_priv = get_lb_priv(team);
 308         lb_select_tx_port_func_t *func;
 309         char *name;
 310
 311         func = rcu_dereference_protected(lb_priv->select_tx_port_func,
 312                                          lockdep_is_held(&team->lock));
 313         name = lb_select_tx_port_get_name(func);
 314         BUG_ON(!name);
 315         ctx->data.str_val = name;
 316         return 0;
 317 }
 318
 319 static int lb_tx_method_set(struct team *team, struct team_gsetter_ctx *ctx)
 320 {
 321         struct lb_priv *lb_priv = get_lb_priv(team);
 322         lb_select_tx_port_func_t *func;
 323
 324         func = lb_select_tx_port_get_func(ctx->data.str_val);
 325         if (!func)
 326                 return -EINVAL;
 327         rcu_assign_pointer(lb_priv->select_tx_port_func, func);
 328         return 0;
 329 }
 330
 331 static int lb_tx_hash_to_port_mapping_init(struct team *team,
 332                                            struct team_option_inst_info *info)
 333 {
 334         struct lb_priv *lb_priv = get_lb_priv(team);
 335         unsigned char hash = info->array_index;
 336
 337         LB_HTPM_OPT_INST_INFO_BY_HASH(lb_priv, hash) = info;
 338         return 0;
 339 }
 340
 341 static int lb_tx_hash_to_port_mapping_get(struct team *team,
 342                                           struct team_gsetter_ctx *ctx)
 343 {
 344         struct lb_priv *lb_priv = get_lb_priv(team);
 345         struct team_port *port;
 346         unsigned char hash = ctx->info->array_index;
 347
 348         port = LB_HTPM_PORT_BY_HASH(lb_priv, hash);
 349         ctx->data.u32_val = port ? port->dev->ifindex : 0;
 350         return 0;
 351 }
 352
 353 static int lb_tx_hash_to_port_mapping_set(struct team *team,
 354                                           struct team_gsetter_ctx *ctx)
 355 {
 356         struct lb_priv *lb_priv = get_lb_priv(team);
 357         struct team_port *port;
 358         unsigned char hash = ctx->info->array_index;
 359
 360         list_for_each_entry(port, &team->port_list, list) {
 361                 if (ctx->data.u32_val == port->dev->ifindex &&
 362                     team_port_enabled(port)) {
 363                         rcu_assign_pointer(LB_HTPM_PORT_BY_HASH(lb_priv, hash),
 364                                            port);
 365                         return 0;
 366                 }
 367         }
 368         return -ENODEV;
 369 }
 370
 371 static int lb_hash_stats_init(struct team *team,
 372                               struct team_option_inst_info *info)
 373 {
 374         struct lb_priv *lb_priv = get_lb_priv(team);
 375         unsigned char hash = info->array_index;
 376
 377         lb_priv->ex->stats.info[hash].opt_inst_info = info;
 378         return 0;
 379 }
 380
 381 static int lb_hash_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
 382 {
 383         struct lb_priv *lb_priv = get_lb_priv(team);
 384         unsigned char hash = ctx->info->array_index;
 385
 386         ctx->data.bin_val.ptr = &lb_priv->ex->stats.info[hash].stats;
 387         ctx->data.bin_val.len = sizeof(struct lb_stats);
 388         return 0;
 389 }
 390
 391 static int lb_port_stats_init(struct team *team,
 392                               struct team_option_inst_info *info)
 393 {
 394         struct team_port *port = info->port;
 395         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 396
 397         lb_port_priv->stats_info.opt_inst_info = info;
 398         return 0;
 399 }
 400
 401 static int lb_port_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
 402 {
 403         struct team_port *port = ctx->info->port;
 404         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 405
 406         ctx->data.bin_val.ptr = &lb_port_priv->stats_info.stats;
 407         ctx->data.bin_val.len = sizeof(struct lb_stats);
 408         return 0;
 409 }
 410
 411 static void __lb_stats_info_refresh_prepare(struct lb_stats_info *s_info)
 412 {
 413         memcpy(&s_info->last_stats, &s_info->stats, sizeof(struct lb_stats));
 414         memset(&s_info->stats, 0, sizeof(struct lb_stats));
 415 }
 416
 417 static bool __lb_stats_info_refresh_check(struct lb_stats_info *s_info,
 418                                           struct team *team)
 419 {
 420         if (memcmp(&s_info->last_stats, &s_info->stats,
 421             sizeof(struct lb_stats))) {
 422                 team_option_inst_set_change(s_info->opt_inst_info);
 423                 return true;
 424         }
 425         return false;
 426 }
 427
 428 static void __lb_one_cpu_stats_add(struct lb_stats *acc_stats,
 429                                    struct lb_stats *cpu_stats,
 430                                    struct u64_stats_sync *syncp)
 431 {
 432         unsigned int start;
 433         struct lb_stats tmp;
 434
 435         do {
 436                 start = u64_stats_fetch_begin_bh(syncp);
 437                 tmp.tx_bytes = cpu_stats->tx_bytes;
 438         } while (u64_stats_fetch_retry_bh(syncp, start));
 439         acc_stats->tx_bytes += tmp.tx_bytes;
 440 }
 441
 442 static void lb_stats_refresh(struct work_struct *work)
 443 {
 444         struct team *team;
 445         struct lb_priv *lb_priv;
 446         struct lb_priv_ex *lb_priv_ex;
 447         struct lb_pcpu_stats *pcpu_stats;
 448         struct lb_stats *stats;
 449         struct lb_stats_info *s_info;
 450         struct team_port *port;
 451         bool changed = false;
 452         int i;
 453         int j;
 454
 455         lb_priv_ex = container_of(work, struct lb_priv_ex,
 456                                   stats.refresh_dw.work);
 457
 458         team = lb_priv_ex->team;
 459         lb_priv = get_lb_priv(team);
 460
 461         if (!mutex_trylock(&team->lock)) {
 462                 schedule_delayed_work(&lb_priv_ex->stats.refresh_dw, 0);
 463                 return;
 464         }
 465
 466         for (j = 0; j < LB_TX_HASHTABLE_SIZE; j++) {
 467                 s_info = &lb_priv->ex->stats.info[j];
 468                 __lb_stats_info_refresh_prepare(s_info);
 469                 for_each_possible_cpu(i) {
 470                         pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 471                         stats = &pcpu_stats->hash_stats[j];
 472                         __lb_one_cpu_stats_add(&s_info->stats, stats,
 473                                                &pcpu_stats->syncp);
 474                 }
 475                 changed |= __lb_stats_info_refresh_check(s_info, team);
 476         }
 477
 478         list_for_each_entry(port, &team->port_list, list) {
 479                 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 480
 481                 s_info = &lb_port_priv->stats_info;
 482                 __lb_stats_info_refresh_prepare(s_info);
 483                 for_each_possible_cpu(i) {
 484                         pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 485                         stats = per_cpu_ptr(lb_port_priv->pcpu_stats, i);
 486                         __lb_one_cpu_stats_add(&s_info->stats, stats,
 487                                                &pcpu_stats->syncp);
 488                 }
 489                 changed |= __lb_stats_info_refresh_check(s_info, team);
 490         }
 491
 492         if (changed)
 493                 team_options_change_check(team);
 494
 495         schedule_delayed_work(&lb_priv_ex->stats.refresh_dw,
 496                               (lb_priv_ex->stats.refresh_interval * HZ) / 10);
 497
 498         mutex_unlock(&team->lock);
 499 }
 500
 501 static int lb_stats_refresh_interval_get(struct team *team,
 502                                          struct team_gsetter_ctx *ctx)
 503 {
 504         struct lb_priv *lb_priv = get_lb_priv(team);
 505
 506         ctx->data.u32_val = lb_priv->ex->stats.refresh_interval;
 507         return 0;
 508 }
 509
 510 static int lb_stats_refresh_interval_set(struct team *team,
 511                                          struct team_gsetter_ctx *ctx)
 512 {
 513         struct lb_priv *lb_priv = get_lb_priv(team);
 514         unsigned int interval;
 515
 516         interval = ctx->data.u32_val;
 517         if (lb_priv->ex->stats.refresh_interval == interval)
 518                 return 0;
 519         lb_priv->ex->stats.refresh_interval = interval;
 520         if (interval)
 521                 schedule_delayed_work(&lb_priv->ex->stats.refresh_dw, 0);
 522         else
 523                 cancel_delayed_work(&lb_priv->ex->stats.refresh_dw);
 524         return 0;
 525 }
 526
 527 static const struct team_option lb_options[] = {
 528         {
 529                 .name = "bpf_hash_func",
 530                 .type = TEAM_OPTION_TYPE_BINARY,
 531                 .getter = lb_bpf_func_get,
 532                 .setter = lb_bpf_func_set,
 533         },
 534         {
 535                 .name = "lb_tx_method",
 536                 .type = TEAM_OPTION_TYPE_STRING,
 537                 .getter = lb_tx_method_get,
 538                 .setter = lb_tx_method_set,
 539         },
 540         {
 541                 .name = "lb_tx_hash_to_port_mapping",
 542                 .array_size = LB_TX_HASHTABLE_SIZE,
 543                 .type = TEAM_OPTION_TYPE_U32,
 544                 .init = lb_tx_hash_to_port_mapping_init,
 545                 .getter = lb_tx_hash_to_port_mapping_get,
 546                 .setter = lb_tx_hash_to_port_mapping_set,
 547         },
 548         {
 549                 .name = "lb_hash_stats",
 550                 .array_size = LB_TX_HASHTABLE_SIZE,
 551                 .type = TEAM_OPTION_TYPE_BINARY,
 552                 .init = lb_hash_stats_init,
 553                 .getter = lb_hash_stats_get,
 554         },
 555         {
 556                 .name = "lb_port_stats",
 557                 .per_port = true,
 558                 .type = TEAM_OPTION_TYPE_BINARY,
 559                 .init = lb_port_stats_init,
 560                 .getter = lb_port_stats_get,
 561         },
 562         {
 563                 .name = "lb_stats_refresh_interval",
 564                 .type = TEAM_OPTION_TYPE_U32,
 565                 .getter = lb_stats_refresh_interval_get,
 566                 .setter = lb_stats_refresh_interval_set,
 567         },
 568 };
 569
 570 static int lb_init(struct team *team)
 571 {
 572         struct lb_priv *lb_priv = get_lb_priv(team);
 573         lb_select_tx_port_func_t *func;
 574         int err;
 575
 576         /* set default tx port selector */
 577         func = lb_select_tx_port_get_func("hash");
 578         BUG_ON(!func);
 579         rcu_assign_pointer(lb_priv->select_tx_port_func, func);
 580
 581         lb_priv->ex = kzalloc(sizeof(*lb_priv->ex), GFP_KERNEL);
 582         if (!lb_priv->ex)
 583                 return -ENOMEM;
 584         lb_priv->ex->team = team;
 585
 586         lb_priv->pcpu_stats = alloc_percpu(struct lb_pcpu_stats);
 587         if (!lb_priv->pcpu_stats) {
 588                 err = -ENOMEM;
 589                 goto err_alloc_pcpu_stats;
 590         }
 591
 592         INIT_DELAYED_WORK(&lb_priv->ex->stats.refresh_dw, lb_stats_refresh);
 593
 594         err = team_options_register(team, lb_options, ARRAY_SIZE(lb_options));
 595         if (err)
 596                 goto err_options_register;
 597         return 0;
 598
 599 err_options_register:
 600         free_percpu(lb_priv->pcpu_stats);
 601 err_alloc_pcpu_stats:
 602         kfree(lb_priv->ex);
 603         return err;
 604 }
 605
 606 static void lb_exit(struct team *team)
 607 {
 608         struct lb_priv *lb_priv = get_lb_priv(team);
 609
 610         team_options_unregister(team, lb_options,
 611                                 ARRAY_SIZE(lb_options));
 612         cancel_delayed_work_sync(&lb_priv->ex->stats.refresh_dw);
 613         free_percpu(lb_priv->pcpu_stats);
 614         kfree(lb_priv->ex);
 615 }
 616
 617 static int lb_port_enter(struct team *team, struct team_port *port)
 618 {
 619         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 620
 621         lb_port_priv->pcpu_stats = alloc_percpu(struct lb_stats);
 622         if (!lb_port_priv->pcpu_stats)
 623                 return -ENOMEM;
 624         return 0;
 625 }
 626
 627 static void lb_port_leave(struct team *team, struct team_port *port)
 628 {
 629         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 630
 631         free_percpu(lb_port_priv->pcpu_stats);
 632 }
 633
 634 static void lb_port_disabled(struct team *team, struct team_port *port)
 635 {
 636         lb_tx_hash_to_port_mapping_null_port(team, port);
 637 }
 638
 639 static const struct team_mode_ops lb_mode_ops = {
 640         .init                   = lb_init,
 641         .exit                   = lb_exit,
 642         .port_enter             = lb_port_enter,
 643         .port_leave             = lb_port_leave,
 644         .port_disabled          = lb_port_disabled,
 645         .transmit               = lb_transmit,
 646 };
 647
 648 static const struct team_mode lb_mode = {
 649         .kind           = "loadbalance",
 650         .owner          = THIS_MODULE,
 651         .priv_size      = sizeof(struct lb_priv),
 652         .port_priv_size = sizeof(struct lb_port_priv),
 653         .ops            = &lb_mode_ops,
 654 };
 655
 656 static int __init lb_init_module(void)
 657 {
 658         return team_mode_register(&lb_mode);
 659 }
 660
 661 static void __exit lb_cleanup_module(void)
 662 {
 663         team_mode_unregister(&lb_mode);
 664 }
 665
 666 module_init(lb_init_module);
 667 module_exit(lb_cleanup_module);
 668
 669 MODULE_LICENSE("GPL v2");
 670 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
 671 MODULE_DESCRIPTION("Load-balancing mode for team");
 672 MODULE_ALIAS("team-mode-loadbalance");