kernel/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_kern *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 bpf_prog __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 bpf_prog *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 = BPF_PROG_RUN(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_kern **pfprog, u32 data_len,
 245                           const void *data)
 246 {
 247         struct sock_fprog_kern *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(*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_kern *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 bpf_prog *fp = NULL;
 275         struct bpf_prog *orig_fp = NULL;
 276         struct sock_fprog_kern *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 = bpf_prog_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         }
 297
 298         rcu_assign_pointer(lb_priv->fp, fp);
 299         lb_priv->ex->orig_fprog = fprog;
 300
 301         if (orig_fp) {
 302                 synchronize_rcu();
 303                 bpf_prog_destroy(orig_fp);
 304         }
 305         return 0;
 306 }
 307
 308 static int lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
 309 {
 310         struct lb_priv *lb_priv = get_lb_priv(team);
 311         lb_select_tx_port_func_t *func;
 312         char *name;
 313
 314         func = rcu_dereference_protected(lb_priv->select_tx_port_func,
 315                                          lockdep_is_held(&team->lock));
 316         name = lb_select_tx_port_get_name(func);
 317         BUG_ON(!name);
 318         ctx->data.str_val = name;
 319         return 0;
 320 }
 321
 322 static int lb_tx_method_set(struct team *team, struct team_gsetter_ctx *ctx)
 323 {
 324         struct lb_priv *lb_priv = get_lb_priv(team);
 325         lb_select_tx_port_func_t *func;
 326
 327         func = lb_select_tx_port_get_func(ctx->data.str_val);
 328         if (!func)
 329                 return -EINVAL;
 330         rcu_assign_pointer(lb_priv->select_tx_port_func, func);
 331         return 0;
 332 }
 333
 334 static int lb_tx_hash_to_port_mapping_init(struct team *team,
 335                                            struct team_option_inst_info *info)
 336 {
 337         struct lb_priv *lb_priv = get_lb_priv(team);
 338         unsigned char hash = info->array_index;
 339
 340         LB_HTPM_OPT_INST_INFO_BY_HASH(lb_priv, hash) = info;
 341         return 0;
 342 }
 343
 344 static int lb_tx_hash_to_port_mapping_get(struct team *team,
 345                                           struct team_gsetter_ctx *ctx)
 346 {
 347         struct lb_priv *lb_priv = get_lb_priv(team);
 348         struct team_port *port;
 349         unsigned char hash = ctx->info->array_index;
 350
 351         port = LB_HTPM_PORT_BY_HASH(lb_priv, hash);
 352         ctx->data.u32_val = port ? port->dev->ifindex : 0;
 353         return 0;
 354 }
 355
 356 static int lb_tx_hash_to_port_mapping_set(struct team *team,
 357                                           struct team_gsetter_ctx *ctx)
 358 {
 359         struct lb_priv *lb_priv = get_lb_priv(team);
 360         struct team_port *port;
 361         unsigned char hash = ctx->info->array_index;
 362
 363         list_for_each_entry(port, &team->port_list, list) {
 364                 if (ctx->data.u32_val == port->dev->ifindex &&
 365                     team_port_enabled(port)) {
 366                         rcu_assign_pointer(LB_HTPM_PORT_BY_HASH(lb_priv, hash),
 367                                            port);
 368                         return 0;
 369                 }
 370         }
 371         return -ENODEV;
 372 }
 373
 374 static int lb_hash_stats_init(struct team *team,
 375                               struct team_option_inst_info *info)
 376 {
 377         struct lb_priv *lb_priv = get_lb_priv(team);
 378         unsigned char hash = info->array_index;
 379
 380         lb_priv->ex->stats.info[hash].opt_inst_info = info;
 381         return 0;
 382 }
 383
 384 static int lb_hash_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
 385 {
 386         struct lb_priv *lb_priv = get_lb_priv(team);
 387         unsigned char hash = ctx->info->array_index;
 388
 389         ctx->data.bin_val.ptr = &lb_priv->ex->stats.info[hash].stats;
 390         ctx->data.bin_val.len = sizeof(struct lb_stats);
 391         return 0;
 392 }
 393
 394 static int lb_port_stats_init(struct team *team,
 395                               struct team_option_inst_info *info)
 396 {
 397         struct team_port *port = info->port;
 398         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 399
 400         lb_port_priv->stats_info.opt_inst_info = info;
 401         return 0;
 402 }
 403
 404 static int lb_port_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
 405 {
 406         struct team_port *port = ctx->info->port;
 407         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 408
 409         ctx->data.bin_val.ptr = &lb_port_priv->stats_info.stats;
 410         ctx->data.bin_val.len = sizeof(struct lb_stats);
 411         return 0;
 412 }
 413
 414 static void __lb_stats_info_refresh_prepare(struct lb_stats_info *s_info)
 415 {
 416         memcpy(&s_info->last_stats, &s_info->stats, sizeof(struct lb_stats));
 417         memset(&s_info->stats, 0, sizeof(struct lb_stats));
 418 }
 419
 420 static bool __lb_stats_info_refresh_check(struct lb_stats_info *s_info,
 421                                           struct team *team)
 422 {
 423         if (memcmp(&s_info->last_stats, &s_info->stats,
 424             sizeof(struct lb_stats))) {
 425                 team_option_inst_set_change(s_info->opt_inst_info);
 426                 return true;
 427         }
 428         return false;
 429 }
 430
 431 static void __lb_one_cpu_stats_add(struct lb_stats *acc_stats,
 432                                    struct lb_stats *cpu_stats,
 433                                    struct u64_stats_sync *syncp)
 434 {
 435         unsigned int start;
 436         struct lb_stats tmp;
 437
 438         do {
 439                 start = u64_stats_fetch_begin_irq(syncp);
 440                 tmp.tx_bytes = cpu_stats->tx_bytes;
 441         } while (u64_stats_fetch_retry_irq(syncp, start));
 442         acc_stats->tx_bytes += tmp.tx_bytes;
 443 }
 444
 445 static void lb_stats_refresh(struct work_struct *work)
 446 {
 447         struct team *team;
 448         struct lb_priv *lb_priv;
 449         struct lb_priv_ex *lb_priv_ex;
 450         struct lb_pcpu_stats *pcpu_stats;
 451         struct lb_stats *stats;
 452         struct lb_stats_info *s_info;
 453         struct team_port *port;
 454         bool changed = false;
 455         int i;
 456         int j;
 457
 458         lb_priv_ex = container_of(work, struct lb_priv_ex,
 459                                   stats.refresh_dw.work);
 460
 461         team = lb_priv_ex->team;
 462         lb_priv = get_lb_priv(team);
 463
 464         if (!mutex_trylock(&team->lock)) {
 465                 schedule_delayed_work(&lb_priv_ex->stats.refresh_dw, 0);
 466                 return;
 467         }
 468
 469         for (j = 0; j < LB_TX_HASHTABLE_SIZE; j++) {
 470                 s_info = &lb_priv->ex->stats.info[j];
 471                 __lb_stats_info_refresh_prepare(s_info);
 472                 for_each_possible_cpu(i) {
 473                         pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 474                         stats = &pcpu_stats->hash_stats[j];
 475                         __lb_one_cpu_stats_add(&s_info->stats, stats,
 476                                                &pcpu_stats->syncp);
 477                 }
 478                 changed |= __lb_stats_info_refresh_check(s_info, team);
 479         }
 480
 481         list_for_each_entry(port, &team->port_list, list) {
 482                 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 483
 484                 s_info = &lb_port_priv->stats_info;
 485                 __lb_stats_info_refresh_prepare(s_info);
 486                 for_each_possible_cpu(i) {
 487                         pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 488                         stats = per_cpu_ptr(lb_port_priv->pcpu_stats, i);
 489                         __lb_one_cpu_stats_add(&s_info->stats, stats,
 490                                                &pcpu_stats->syncp);
 491                 }
 492                 changed |= __lb_stats_info_refresh_check(s_info, team);
 493         }
 494
 495         if (changed)
 496                 team_options_change_check(team);
 497
 498         schedule_delayed_work(&lb_priv_ex->stats.refresh_dw,
 499                               (lb_priv_ex->stats.refresh_interval * HZ) / 10);
 500
 501         mutex_unlock(&team->lock);
 502 }
 503
 504 static int lb_stats_refresh_interval_get(struct team *team,
 505                                          struct team_gsetter_ctx *ctx)
 506 {
 507         struct lb_priv *lb_priv = get_lb_priv(team);
 508
 509         ctx->data.u32_val = lb_priv->ex->stats.refresh_interval;
 510         return 0;
 511 }
 512
 513 static int lb_stats_refresh_interval_set(struct team *team,
 514                                          struct team_gsetter_ctx *ctx)
 515 {
 516         struct lb_priv *lb_priv = get_lb_priv(team);
 517         unsigned int interval;
 518
 519         interval = ctx->data.u32_val;
 520         if (lb_priv->ex->stats.refresh_interval == interval)
 521                 return 0;
 522         lb_priv->ex->stats.refresh_interval = interval;
 523         if (interval)
 524                 schedule_delayed_work(&lb_priv->ex->stats.refresh_dw, 0);
 525         else
 526                 cancel_delayed_work(&lb_priv->ex->stats.refresh_dw);
 527         return 0;
 528 }
 529
 530 static const struct team_option lb_options[] = {
 531         {
 532                 .name = "bpf_hash_func",
 533                 .type = TEAM_OPTION_TYPE_BINARY,
 534                 .getter = lb_bpf_func_get,
 535                 .setter = lb_bpf_func_set,
 536         },
 537         {
 538                 .name = "lb_tx_method",
 539                 .type = TEAM_OPTION_TYPE_STRING,
 540                 .getter = lb_tx_method_get,
 541                 .setter = lb_tx_method_set,
 542         },
 543         {
 544                 .name = "lb_tx_hash_to_port_mapping",
 545                 .array_size = LB_TX_HASHTABLE_SIZE,
 546                 .type = TEAM_OPTION_TYPE_U32,
 547                 .init = lb_tx_hash_to_port_mapping_init,
 548                 .getter = lb_tx_hash_to_port_mapping_get,
 549                 .setter = lb_tx_hash_to_port_mapping_set,
 550         },
 551         {
 552                 .name = "lb_hash_stats",
 553                 .array_size = LB_TX_HASHTABLE_SIZE,
 554                 .type = TEAM_OPTION_TYPE_BINARY,
 555                 .init = lb_hash_stats_init,
 556                 .getter = lb_hash_stats_get,
 557         },
 558         {
 559                 .name = "lb_port_stats",
 560                 .per_port = true,
 561                 .type = TEAM_OPTION_TYPE_BINARY,
 562                 .init = lb_port_stats_init,
 563                 .getter = lb_port_stats_get,
 564         },
 565         {
 566                 .name = "lb_stats_refresh_interval",
 567                 .type = TEAM_OPTION_TYPE_U32,
 568                 .getter = lb_stats_refresh_interval_get,
 569                 .setter = lb_stats_refresh_interval_set,
 570         },
 571 };
 572
 573 static int lb_init(struct team *team)
 574 {
 575         struct lb_priv *lb_priv = get_lb_priv(team);
 576         lb_select_tx_port_func_t *func;
 577         int i, err;
 578
 579         /* set default tx port selector */
 580         func = lb_select_tx_port_get_func("hash");
 581         BUG_ON(!func);
 582         rcu_assign_pointer(lb_priv->select_tx_port_func, func);
 583
 584         lb_priv->ex = kzalloc(sizeof(*lb_priv->ex), GFP_KERNEL);
 585         if (!lb_priv->ex)
 586                 return -ENOMEM;
 587         lb_priv->ex->team = team;
 588
 589         lb_priv->pcpu_stats = alloc_percpu(struct lb_pcpu_stats);
 590         if (!lb_priv->pcpu_stats) {
 591                 err = -ENOMEM;
 592                 goto err_alloc_pcpu_stats;
 593         }
 594
 595         for_each_possible_cpu(i) {
 596                 struct lb_pcpu_stats *team_lb_stats;
 597                 team_lb_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 598                 u64_stats_init(&team_lb_stats->syncp);
 599         }
 600
 601
 602         INIT_DELAYED_WORK(&lb_priv->ex->stats.refresh_dw, lb_stats_refresh);
 603
 604         err = team_options_register(team, lb_options, ARRAY_SIZE(lb_options));
 605         if (err)
 606                 goto err_options_register;
 607         return 0;
 608
 609 err_options_register:
 610         free_percpu(lb_priv->pcpu_stats);
 611 err_alloc_pcpu_stats:
 612         kfree(lb_priv->ex);
 613         return err;
 614 }
 615
 616 static void lb_exit(struct team *team)
 617 {
 618         struct lb_priv *lb_priv = get_lb_priv(team);
 619
 620         team_options_unregister(team, lb_options,
 621                                 ARRAY_SIZE(lb_options));
 622         cancel_delayed_work_sync(&lb_priv->ex->stats.refresh_dw);
 623         free_percpu(lb_priv->pcpu_stats);
 624         kfree(lb_priv->ex);
 625 }
 626
 627 static int lb_port_enter(struct team *team, struct team_port *port)
 628 {
 629         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 630
 631         lb_port_priv->pcpu_stats = alloc_percpu(struct lb_stats);
 632         if (!lb_port_priv->pcpu_stats)
 633                 return -ENOMEM;
 634         return 0;
 635 }
 636
 637 static void lb_port_leave(struct team *team, struct team_port *port)
 638 {
 639         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 640
 641         free_percpu(lb_port_priv->pcpu_stats);
 642 }
 643
 644 static void lb_port_disabled(struct team *team, struct team_port *port)
 645 {
 646         lb_tx_hash_to_port_mapping_null_port(team, port);
 647 }
 648
 649 static const struct team_mode_ops lb_mode_ops = {
 650         .init                   = lb_init,
 651         .exit                   = lb_exit,
 652         .port_enter             = lb_port_enter,
 653         .port_leave             = lb_port_leave,
 654         .port_disabled          = lb_port_disabled,
 655         .transmit               = lb_transmit,
 656 };
 657
 658 static const struct team_mode lb_mode = {
 659         .kind           = "loadbalance",
 660         .owner          = THIS_MODULE,
 661         .priv_size      = sizeof(struct lb_priv),
 662         .port_priv_size = sizeof(struct lb_port_priv),
 663         .ops            = &lb_mode_ops,
 664 };
 665
 666 static int __init lb_init_module(void)
 667 {
 668         return team_mode_register(&lb_mode);
 669 }
 670
 671 static void __exit lb_cleanup_module(void)
 672 {
 673         team_mode_unregister(&lb_mode);
 674 }
 675
 676 module_init(lb_init_module);
 677 module_exit(lb_cleanup_module);
 678
 679 MODULE_LICENSE("GPL v2");
 680 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
 681 MODULE_DESCRIPTION("Load-balancing mode for team");
 682 MODULE_ALIAS("team-mode-loadbalance");