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/etherdevice.h>
  18 #include <linux/filter.h>
  19 #include <linux/if_team.h>
  20
  21 static rx_handler_result_t lb_receive(struct team *team, struct team_port *port,
  22                                       struct sk_buff *skb)
  23 {
  24         if (unlikely(skb->protocol == htons(ETH_P_SLOW))) {
  25                 /* LACPDU packets should go to exact delivery */
  26                 const unsigned char *dest = eth_hdr(skb)->h_dest;
  27
  28                 if (is_link_local_ether_addr(dest) && dest[5] == 0x02)
  29                         return RX_HANDLER_EXACT;
  30         }
  31         return RX_HANDLER_ANOTHER;
  32 }
  33
  34 struct lb_priv;
  35
  36 typedef struct team_port *lb_select_tx_port_func_t(struct team *,
  37                                                    struct lb_priv *,
  38                                                    struct sk_buff *,
  39                                                    unsigned char);
  40
  41 #define LB_TX_HASHTABLE_SIZE 256 /* hash is a char */
  42
  43 struct lb_stats {
  44         u64 tx_bytes;
  45 };
  46
  47 struct lb_pcpu_stats {
  48         struct lb_stats hash_stats[LB_TX_HASHTABLE_SIZE];
  49         struct u64_stats_sync syncp;
  50 };
  51
  52 struct lb_stats_info {
  53         struct lb_stats stats;
  54         struct lb_stats last_stats;
  55         struct team_option_inst_info *opt_inst_info;
  56 };
  57
  58 struct lb_port_mapping {
  59         struct team_port __rcu *port;
  60         struct team_option_inst_info *opt_inst_info;
  61 };
  62
  63 struct lb_priv_ex {
  64         struct team *team;
  65         struct lb_port_mapping tx_hash_to_port_mapping[LB_TX_HASHTABLE_SIZE];
  66         struct sock_fprog_kern *orig_fprog;
  67         struct {
  68                 unsigned int refresh_interval; /* in tenths of second */
  69                 struct delayed_work refresh_dw;
  70                 struct lb_stats_info info[LB_TX_HASHTABLE_SIZE];
  71         } stats;
  72 };
  73
  74 struct lb_priv {
  75         struct bpf_prog __rcu *fp;
  76         lb_select_tx_port_func_t __rcu *select_tx_port_func;
  77         struct lb_pcpu_stats __percpu *pcpu_stats;
  78         struct lb_priv_ex *ex; /* priv extension */
  79 };
  80
  81 static struct lb_priv *get_lb_priv(struct team *team)
  82 {
  83         return (struct lb_priv *) &team->mode_priv;
  84 }
  85
  86 struct lb_port_priv {
  87         struct lb_stats __percpu *pcpu_stats;
  88         struct lb_stats_info stats_info;
  89 };
  90
  91 static struct lb_port_priv *get_lb_port_priv(struct team_port *port)
  92 {
  93         return (struct lb_port_priv *) &port->mode_priv;
  94 }
  95
  96 #define LB_HTPM_PORT_BY_HASH(lp_priv, hash) \
  97         (lb_priv)->ex->tx_hash_to_port_mapping[hash].port
  98
  99 #define LB_HTPM_OPT_INST_INFO_BY_HASH(lp_priv, hash) \
 100         (lb_priv)->ex->tx_hash_to_port_mapping[hash].opt_inst_info
 101
 102 static void lb_tx_hash_to_port_mapping_null_port(struct team *team,
 103                                                  struct team_port *port)
 104 {
 105         struct lb_priv *lb_priv = get_lb_priv(team);
 106         bool changed = false;
 107         int i;
 108
 109         for (i = 0; i < LB_TX_HASHTABLE_SIZE; i++) {
 110                 struct lb_port_mapping *pm;
 111
 112                 pm = &lb_priv->ex->tx_hash_to_port_mapping[i];
 113                 if (rcu_access_pointer(pm->port) == port) {
 114                         RCU_INIT_POINTER(pm->port, NULL);
 115                         team_option_inst_set_change(pm->opt_inst_info);
 116                         changed = true;
 117                 }
 118         }
 119         if (changed)
 120                 team_options_change_check(team);
 121 }
 122
 123 /* Basic tx selection based solely by hash */
 124 static struct team_port *lb_hash_select_tx_port(struct team *team,
 125                                                 struct lb_priv *lb_priv,
 126                                                 struct sk_buff *skb,
 127                                                 unsigned char hash)
 128 {
 129         int port_index = team_num_to_port_index(team, hash);
 130
 131         return team_get_port_by_index_rcu(team, port_index);
 132 }
 133
 134 /* Hash to port mapping select tx port */
 135 static struct team_port *lb_htpm_select_tx_port(struct team *team,
 136                                                 struct lb_priv *lb_priv,
 137                                                 struct sk_buff *skb,
 138                                                 unsigned char hash)
 139 {
 140         return rcu_dereference_bh(LB_HTPM_PORT_BY_HASH(lb_priv, hash));
 141 }
 142
 143 struct lb_select_tx_port {
 144         char *name;
 145         lb_select_tx_port_func_t *func;
 146 };
 147
 148 static const struct lb_select_tx_port lb_select_tx_port_list[] = {
 149         {
 150                 .name = "hash",
 151                 .func = lb_hash_select_tx_port,
 152         },
 153         {
 154                 .name = "hash_to_port_mapping",
 155                 .func = lb_htpm_select_tx_port,
 156         },
 157 };
 158 #define LB_SELECT_TX_PORT_LIST_COUNT ARRAY_SIZE(lb_select_tx_port_list)
 159
 160 static char *lb_select_tx_port_get_name(lb_select_tx_port_func_t *func)
 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 (item->func == func)
 169                         return item->name;
 170         }
 171         return NULL;
 172 }
 173
 174 static lb_select_tx_port_func_t *lb_select_tx_port_get_func(const char *name)
 175 {
 176         int i;
 177
 178         for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
 179                 const struct lb_select_tx_port *item;
 180
 181                 item = &lb_select_tx_port_list[i];
 182                 if (!strcmp(item->name, name))
 183                         return item->func;
 184         }
 185         return NULL;
 186 }
 187
 188 static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv,
 189                                     struct sk_buff *skb)
 190 {
 191         struct bpf_prog *fp;
 192         uint32_t lhash;
 193         unsigned char *c;
 194
 195         fp = rcu_dereference_bh(lb_priv->fp);
 196         if (unlikely(!fp))
 197                 return 0;
 198         lhash = BPF_PROG_RUN(fp, skb);
 199         c = (char *) &lhash;
 200         return c[0] ^ c[1] ^ c[2] ^ c[3];
 201 }
 202
 203 static void lb_update_tx_stats(unsigned int tx_bytes, struct lb_priv *lb_priv,
 204                                struct lb_port_priv *lb_port_priv,
 205                                unsigned char hash)
 206 {
 207         struct lb_pcpu_stats *pcpu_stats;
 208         struct lb_stats *port_stats;
 209         struct lb_stats *hash_stats;
 210
 211         pcpu_stats = this_cpu_ptr(lb_priv->pcpu_stats);
 212         port_stats = this_cpu_ptr(lb_port_priv->pcpu_stats);
 213         hash_stats = &pcpu_stats->hash_stats[hash];
 214         u64_stats_update_begin(&pcpu_stats->syncp);
 215         port_stats->tx_bytes += tx_bytes;
 216         hash_stats->tx_bytes += tx_bytes;
 217         u64_stats_update_end(&pcpu_stats->syncp);
 218 }
 219
 220 static bool lb_transmit(struct team *team, struct sk_buff *skb)
 221 {
 222         struct lb_priv *lb_priv = get_lb_priv(team);
 223         lb_select_tx_port_func_t *select_tx_port_func;
 224         struct team_port *port;
 225         unsigned char hash;
 226         unsigned int tx_bytes = skb->len;
 227
 228         hash = lb_get_skb_hash(lb_priv, skb);
 229         select_tx_port_func = rcu_dereference_bh(lb_priv->select_tx_port_func);
 230         port = select_tx_port_func(team, lb_priv, skb, hash);
 231         if (unlikely(!port))
 232                 goto drop;
 233         if (team_dev_queue_xmit(team, port, skb))
 234                 return false;
 235         lb_update_tx_stats(tx_bytes, lb_priv, get_lb_port_priv(port), hash);
 236         return true;
 237
 238 drop:
 239         dev_kfree_skb_any(skb);
 240         return false;
 241 }
 242
 243 static int lb_bpf_func_get(struct team *team, struct team_gsetter_ctx *ctx)
 244 {
 245         struct lb_priv *lb_priv = get_lb_priv(team);
 246
 247         if (!lb_priv->ex->orig_fprog) {
 248                 ctx->data.bin_val.len = 0;
 249                 ctx->data.bin_val.ptr = NULL;
 250                 return 0;
 251         }
 252         ctx->data.bin_val.len = lb_priv->ex->orig_fprog->len *
 253                                 sizeof(struct sock_filter);
 254         ctx->data.bin_val.ptr = lb_priv->ex->orig_fprog->filter;
 255         return 0;
 256 }
 257
 258 static int __fprog_create(struct sock_fprog_kern **pfprog, u32 data_len,
 259                           const void *data)
 260 {
 261         struct sock_fprog_kern *fprog;
 262         struct sock_filter *filter = (struct sock_filter *) data;
 263
 264         if (data_len % sizeof(struct sock_filter))
 265                 return -EINVAL;
 266         fprog = kmalloc(sizeof(*fprog), GFP_KERNEL);
 267         if (!fprog)
 268                 return -ENOMEM;
 269         fprog->filter = kmemdup(filter, data_len, GFP_KERNEL);
 270         if (!fprog->filter) {
 271                 kfree(fprog);
 272                 return -ENOMEM;
 273         }
 274         fprog->len = data_len / sizeof(struct sock_filter);
 275         *pfprog = fprog;
 276         return 0;
 277 }
 278
 279 static void __fprog_destroy(struct sock_fprog_kern *fprog)
 280 {
 281         kfree(fprog->filter);
 282         kfree(fprog);
 283 }
 284
 285 static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
 286 {
 287         struct lb_priv *lb_priv = get_lb_priv(team);
 288         struct bpf_prog *fp = NULL;
 289         struct bpf_prog *orig_fp = NULL;
 290         struct sock_fprog_kern *fprog = NULL;
 291         int err;
 292
 293         if (ctx->data.bin_val.len) {
 294                 err = __fprog_create(&fprog, ctx->data.bin_val.len,
 295                                      ctx->data.bin_val.ptr);
 296                 if (err)
 297                         return err;
 298                 err = bpf_prog_create(&fp, fprog);
 299                 if (err) {
 300                         __fprog_destroy(fprog);
 301                         return err;
 302                 }
 303         }
 304
 305         if (lb_priv->ex->orig_fprog) {
 306                 /* Clear old filter data */
 307                 __fprog_destroy(lb_priv->ex->orig_fprog);
 308                 orig_fp = rcu_dereference_protected(lb_priv->fp,
 309                                                 lockdep_is_held(&team->lock));
 310         }
 311
 312         rcu_assign_pointer(lb_priv->fp, fp);
 313         lb_priv->ex->orig_fprog = fprog;
 314
 315         if (orig_fp) {
 316                 synchronize_rcu();
 317                 bpf_prog_destroy(orig_fp);
 318         }
 319         return 0;
 320 }
 321
 322 static int lb_tx_method_get(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         char *name;
 327
 328         func = rcu_dereference_protected(lb_priv->select_tx_port_func,
 329                                          lockdep_is_held(&team->lock));
 330         name = lb_select_tx_port_get_name(func);
 331         BUG_ON(!name);
 332         ctx->data.str_val = name;
 333         return 0;
 334 }
 335
 336 static int lb_tx_method_set(struct team *team, struct team_gsetter_ctx *ctx)
 337 {
 338         struct lb_priv *lb_priv = get_lb_priv(team);
 339         lb_select_tx_port_func_t *func;
 340
 341         func = lb_select_tx_port_get_func(ctx->data.str_val);
 342         if (!func)
 343                 return -EINVAL;
 344         rcu_assign_pointer(lb_priv->select_tx_port_func, func);
 345         return 0;
 346 }
 347
 348 static int lb_tx_hash_to_port_mapping_init(struct team *team,
 349                                            struct team_option_inst_info *info)
 350 {
 351         struct lb_priv *lb_priv = get_lb_priv(team);
 352         unsigned char hash = info->array_index;
 353
 354         LB_HTPM_OPT_INST_INFO_BY_HASH(lb_priv, hash) = info;
 355         return 0;
 356 }
 357
 358 static int lb_tx_hash_to_port_mapping_get(struct team *team,
 359                                           struct team_gsetter_ctx *ctx)
 360 {
 361         struct lb_priv *lb_priv = get_lb_priv(team);
 362         struct team_port *port;
 363         unsigned char hash = ctx->info->array_index;
 364
 365         port = LB_HTPM_PORT_BY_HASH(lb_priv, hash);
 366         ctx->data.u32_val = port ? port->dev->ifindex : 0;
 367         return 0;
 368 }
 369
 370 static int lb_tx_hash_to_port_mapping_set(struct team *team,
 371                                           struct team_gsetter_ctx *ctx)
 372 {
 373         struct lb_priv *lb_priv = get_lb_priv(team);
 374         struct team_port *port;
 375         unsigned char hash = ctx->info->array_index;
 376
 377         list_for_each_entry(port, &team->port_list, list) {
 378                 if (ctx->data.u32_val == port->dev->ifindex &&
 379                     team_port_enabled(port)) {
 380                         rcu_assign_pointer(LB_HTPM_PORT_BY_HASH(lb_priv, hash),
 381                                            port);
 382                         return 0;
 383                 }
 384         }
 385         return -ENODEV;
 386 }
 387
 388 static int lb_hash_stats_init(struct team *team,
 389                               struct team_option_inst_info *info)
 390 {
 391         struct lb_priv *lb_priv = get_lb_priv(team);
 392         unsigned char hash = info->array_index;
 393
 394         lb_priv->ex->stats.info[hash].opt_inst_info = info;
 395         return 0;
 396 }
 397
 398 static int lb_hash_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
 399 {
 400         struct lb_priv *lb_priv = get_lb_priv(team);
 401         unsigned char hash = ctx->info->array_index;
 402
 403         ctx->data.bin_val.ptr = &lb_priv->ex->stats.info[hash].stats;
 404         ctx->data.bin_val.len = sizeof(struct lb_stats);
 405         return 0;
 406 }
 407
 408 static int lb_port_stats_init(struct team *team,
 409                               struct team_option_inst_info *info)
 410 {
 411         struct team_port *port = info->port;
 412         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 413
 414         lb_port_priv->stats_info.opt_inst_info = info;
 415         return 0;
 416 }
 417
 418 static int lb_port_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
 419 {
 420         struct team_port *port = ctx->info->port;
 421         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 422
 423         ctx->data.bin_val.ptr = &lb_port_priv->stats_info.stats;
 424         ctx->data.bin_val.len = sizeof(struct lb_stats);
 425         return 0;
 426 }
 427
 428 static void __lb_stats_info_refresh_prepare(struct lb_stats_info *s_info)
 429 {
 430         memcpy(&s_info->last_stats, &s_info->stats, sizeof(struct lb_stats));
 431         memset(&s_info->stats, 0, sizeof(struct lb_stats));
 432 }
 433
 434 static bool __lb_stats_info_refresh_check(struct lb_stats_info *s_info,
 435                                           struct team *team)
 436 {
 437         if (memcmp(&s_info->last_stats, &s_info->stats,
 438             sizeof(struct lb_stats))) {
 439                 team_option_inst_set_change(s_info->opt_inst_info);
 440                 return true;
 441         }
 442         return false;
 443 }
 444
 445 static void __lb_one_cpu_stats_add(struct lb_stats *acc_stats,
 446                                    struct lb_stats *cpu_stats,
 447                                    struct u64_stats_sync *syncp)
 448 {
 449         unsigned int start;
 450         struct lb_stats tmp;
 451
 452         do {
 453                 start = u64_stats_fetch_begin_irq(syncp);
 454                 tmp.tx_bytes = cpu_stats->tx_bytes;
 455         } while (u64_stats_fetch_retry_irq(syncp, start));
 456         acc_stats->tx_bytes += tmp.tx_bytes;
 457 }
 458
 459 static void lb_stats_refresh(struct work_struct *work)
 460 {
 461         struct team *team;
 462         struct lb_priv *lb_priv;
 463         struct lb_priv_ex *lb_priv_ex;
 464         struct lb_pcpu_stats *pcpu_stats;
 465         struct lb_stats *stats;
 466         struct lb_stats_info *s_info;
 467         struct team_port *port;
 468         bool changed = false;
 469         int i;
 470         int j;
 471
 472         lb_priv_ex = container_of(work, struct lb_priv_ex,
 473                                   stats.refresh_dw.work);
 474
 475         team = lb_priv_ex->team;
 476         lb_priv = get_lb_priv(team);
 477
 478         if (!mutex_trylock(&team->lock)) {
 479                 schedule_delayed_work(&lb_priv_ex->stats.refresh_dw, 0);
 480                 return;
 481         }
 482
 483         for (j = 0; j < LB_TX_HASHTABLE_SIZE; j++) {
 484                 s_info = &lb_priv->ex->stats.info[j];
 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 = &pcpu_stats->hash_stats[j];
 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         list_for_each_entry(port, &team->port_list, list) {
 496                 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 497
 498                 s_info = &lb_port_priv->stats_info;
 499                 __lb_stats_info_refresh_prepare(s_info);
 500                 for_each_possible_cpu(i) {
 501                         pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 502                         stats = per_cpu_ptr(lb_port_priv->pcpu_stats, i);
 503                         __lb_one_cpu_stats_add(&s_info->stats, stats,
 504                                                &pcpu_stats->syncp);
 505                 }
 506                 changed |= __lb_stats_info_refresh_check(s_info, team);
 507         }
 508
 509         if (changed)
 510                 team_options_change_check(team);
 511
 512         schedule_delayed_work(&lb_priv_ex->stats.refresh_dw,
 513                               (lb_priv_ex->stats.refresh_interval * HZ) / 10);
 514
 515         mutex_unlock(&team->lock);
 516 }
 517
 518 static int lb_stats_refresh_interval_get(struct team *team,
 519                                          struct team_gsetter_ctx *ctx)
 520 {
 521         struct lb_priv *lb_priv = get_lb_priv(team);
 522
 523         ctx->data.u32_val = lb_priv->ex->stats.refresh_interval;
 524         return 0;
 525 }
 526
 527 static int lb_stats_refresh_interval_set(struct team *team,
 528                                          struct team_gsetter_ctx *ctx)
 529 {
 530         struct lb_priv *lb_priv = get_lb_priv(team);
 531         unsigned int interval;
 532
 533         interval = ctx->data.u32_val;
 534         if (lb_priv->ex->stats.refresh_interval == interval)
 535                 return 0;
 536         lb_priv->ex->stats.refresh_interval = interval;
 537         if (interval)
 538                 schedule_delayed_work(&lb_priv->ex->stats.refresh_dw, 0);
 539         else
 540                 cancel_delayed_work(&lb_priv->ex->stats.refresh_dw);
 541         return 0;
 542 }
 543
 544 static const struct team_option lb_options[] = {
 545         {
 546                 .name = "bpf_hash_func",
 547                 .type = TEAM_OPTION_TYPE_BINARY,
 548                 .getter = lb_bpf_func_get,
 549                 .setter = lb_bpf_func_set,
 550         },
 551         {
 552                 .name = "lb_tx_method",
 553                 .type = TEAM_OPTION_TYPE_STRING,
 554                 .getter = lb_tx_method_get,
 555                 .setter = lb_tx_method_set,
 556         },
 557         {
 558                 .name = "lb_tx_hash_to_port_mapping",
 559                 .array_size = LB_TX_HASHTABLE_SIZE,
 560                 .type = TEAM_OPTION_TYPE_U32,
 561                 .init = lb_tx_hash_to_port_mapping_init,
 562                 .getter = lb_tx_hash_to_port_mapping_get,
 563                 .setter = lb_tx_hash_to_port_mapping_set,
 564         },
 565         {
 566                 .name = "lb_hash_stats",
 567                 .array_size = LB_TX_HASHTABLE_SIZE,
 568                 .type = TEAM_OPTION_TYPE_BINARY,
 569                 .init = lb_hash_stats_init,
 570                 .getter = lb_hash_stats_get,
 571         },
 572         {
 573                 .name = "lb_port_stats",
 574                 .per_port = true,
 575                 .type = TEAM_OPTION_TYPE_BINARY,
 576                 .init = lb_port_stats_init,
 577                 .getter = lb_port_stats_get,
 578         },
 579         {
 580                 .name = "lb_stats_refresh_interval",
 581                 .type = TEAM_OPTION_TYPE_U32,
 582                 .getter = lb_stats_refresh_interval_get,
 583                 .setter = lb_stats_refresh_interval_set,
 584         },
 585 };
 586
 587 static int lb_init(struct team *team)
 588 {
 589         struct lb_priv *lb_priv = get_lb_priv(team);
 590         lb_select_tx_port_func_t *func;
 591         int i, err;
 592
 593         /* set default tx port selector */
 594         func = lb_select_tx_port_get_func("hash");
 595         BUG_ON(!func);
 596         rcu_assign_pointer(lb_priv->select_tx_port_func, func);
 597
 598         lb_priv->ex = kzalloc(sizeof(*lb_priv->ex), GFP_KERNEL);
 599         if (!lb_priv->ex)
 600                 return -ENOMEM;
 601         lb_priv->ex->team = team;
 602
 603         lb_priv->pcpu_stats = alloc_percpu(struct lb_pcpu_stats);
 604         if (!lb_priv->pcpu_stats) {
 605                 err = -ENOMEM;
 606                 goto err_alloc_pcpu_stats;
 607         }
 608
 609         for_each_possible_cpu(i) {
 610                 struct lb_pcpu_stats *team_lb_stats;
 611                 team_lb_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 612                 u64_stats_init(&team_lb_stats->syncp);
 613         }
 614
 615
 616         INIT_DELAYED_WORK(&lb_priv->ex->stats.refresh_dw, lb_stats_refresh);
 617
 618         err = team_options_register(team, lb_options, ARRAY_SIZE(lb_options));
 619         if (err)
 620                 goto err_options_register;
 621         return 0;
 622
 623 err_options_register:
 624         free_percpu(lb_priv->pcpu_stats);
 625 err_alloc_pcpu_stats:
 626         kfree(lb_priv->ex);
 627         return err;
 628 }
 629
 630 static void lb_exit(struct team *team)
 631 {
 632         struct lb_priv *lb_priv = get_lb_priv(team);
 633
 634         team_options_unregister(team, lb_options,
 635                                 ARRAY_SIZE(lb_options));
 636         cancel_delayed_work_sync(&lb_priv->ex->stats.refresh_dw);
 637         free_percpu(lb_priv->pcpu_stats);
 638         kfree(lb_priv->ex);
 639 }
 640
 641 static int lb_port_enter(struct team *team, struct team_port *port)
 642 {
 643         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 644
 645         lb_port_priv->pcpu_stats = alloc_percpu(struct lb_stats);
 646         if (!lb_port_priv->pcpu_stats)
 647                 return -ENOMEM;
 648         return 0;
 649 }
 650
 651 static void lb_port_leave(struct team *team, struct team_port *port)
 652 {
 653         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 654
 655         free_percpu(lb_port_priv->pcpu_stats);
 656 }
 657
 658 static void lb_port_disabled(struct team *team, struct team_port *port)
 659 {
 660         lb_tx_hash_to_port_mapping_null_port(team, port);
 661 }
 662
 663 static const struct team_mode_ops lb_mode_ops = {
 664         .init                   = lb_init,
 665         .exit                   = lb_exit,
 666         .port_enter             = lb_port_enter,
 667         .port_leave             = lb_port_leave,
 668         .port_disabled          = lb_port_disabled,
 669         .receive                = lb_receive,
 670         .transmit               = lb_transmit,
 671 };
 672
 673 static const struct team_mode lb_mode = {
 674         .kind           = "loadbalance",
 675         .owner          = THIS_MODULE,
 676         .priv_size      = sizeof(struct lb_priv),
 677         .port_priv_size = sizeof(struct lb_port_priv),
 678         .ops            = &lb_mode_ops,
 679         .lag_tx_type    = NETDEV_LAG_TX_TYPE_HASH,
 680 };
 681
 682 static int __init lb_init_module(void)
 683 {
 684         return team_mode_register(&lb_mode);
 685 }
 686
 687 static void __exit lb_cleanup_module(void)
 688 {
 689         team_mode_unregister(&lb_mode);
 690 }
 691
 692 module_init(lb_init_module);
 693 module_exit(lb_cleanup_module);
 694
 695 MODULE_LICENSE("GPL v2");
 696 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
 697 MODULE_DESCRIPTION("Load-balancing mode for team");
 698 MODULE_ALIAS_TEAM_MODE("loadbalance");