drivers/net/team/team_mode_loadbalance.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/net/team/team_mode_loadbalance.c - Load-balancing mode for team
   4  * Copyright (c) 2012 Jiri Pirko <jpirko@redhat.com>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/filter.h>
  15 #include <linux/if_team.h>
  16
  17 static rx_handler_result_t lb_receive(struct team *team, struct team_port *port,
  18                                       struct sk_buff *skb)
  19 {
  20         if (unlikely(skb->protocol == htons(ETH_P_SLOW))) {
  21                 /* LACPDU packets should go to exact delivery */
  22                 const unsigned char *dest = eth_hdr(skb)->h_dest;
  23
  24                 if (is_link_local_ether_addr(dest) && dest[5] == 0x02)
  25                         return RX_HANDLER_EXACT;
  26         }
  27         return RX_HANDLER_ANOTHER;
  28 }
  29
  30 struct lb_priv;
  31
  32 typedef struct team_port *lb_select_tx_port_func_t(struct team *,
  33                                                    unsigned char);
  34
  35 #define LB_TX_HASHTABLE_SIZE 256 /* hash is a char */
  36
  37 struct lb_stats {
  38         u64 tx_bytes;
  39 };
  40
  41 struct lb_pcpu_stats {
  42         struct lb_stats hash_stats[LB_TX_HASHTABLE_SIZE];
  43         struct u64_stats_sync syncp;
  44 };
  45
  46 struct lb_stats_info {
  47         struct lb_stats stats;
  48         struct lb_stats last_stats;
  49         struct team_option_inst_info *opt_inst_info;
  50 };
  51
  52 struct lb_port_mapping {
  53         struct team_port __rcu *port;
  54         struct team_option_inst_info *opt_inst_info;
  55 };
  56
  57 struct lb_priv_ex {
  58         struct team *team;
  59         struct lb_port_mapping tx_hash_to_port_mapping[LB_TX_HASHTABLE_SIZE];
  60         struct sock_fprog_kern *orig_fprog;
  61         struct {
  62                 unsigned int refresh_interval; /* in tenths of second */
  63                 struct delayed_work refresh_dw;
  64                 struct lb_stats_info info[LB_TX_HASHTABLE_SIZE];
  65         } stats;
  66 };
  67
  68 struct lb_priv {
  69         struct bpf_prog __rcu *fp;
  70         lb_select_tx_port_func_t __rcu *select_tx_port_func;
  71         struct lb_pcpu_stats __percpu *pcpu_stats;
  72         struct lb_priv_ex *ex; /* priv extension */
  73 };
  74
  75 static struct lb_priv *get_lb_priv(struct team *team)
  76 {
  77         return (struct lb_priv *) &team->mode_priv;
  78 }
  79
  80 struct lb_port_priv {
  81         struct lb_stats __percpu *pcpu_stats;
  82         struct lb_stats_info stats_info;
  83 };
  84
  85 static struct lb_port_priv *get_lb_port_priv(struct team_port *port)
  86 {
  87         return (struct lb_port_priv *) &port->mode_priv;
  88 }
  89
  90 #define LB_HTPM_PORT_BY_HASH(lp_priv, hash) \
  91         (lb_priv)->ex->tx_hash_to_port_mapping[hash].port
  92
  93 #define LB_HTPM_OPT_INST_INFO_BY_HASH(lp_priv, hash) \
  94         (lb_priv)->ex->tx_hash_to_port_mapping[hash].opt_inst_info
  95
  96 static void lb_tx_hash_to_port_mapping_null_port(struct team *team,
  97                                                  struct team_port *port)
  98 {
  99         struct lb_priv *lb_priv = get_lb_priv(team);
 100         bool changed = false;
 101         int i;
 102
 103         for (i = 0; i < LB_TX_HASHTABLE_SIZE; i++) {
 104                 struct lb_port_mapping *pm;
 105
 106                 pm = &lb_priv->ex->tx_hash_to_port_mapping[i];
 107                 if (rcu_access_pointer(pm->port) == port) {
 108                         RCU_INIT_POINTER(pm->port, NULL);
 109                         team_option_inst_set_change(pm->opt_inst_info);
 110                         changed = true;
 111                 }
 112         }
 113         if (changed)
 114                 team_options_change_check(team);
 115 }
 116
 117 /* Basic tx selection based solely by hash */
 118 static struct team_port *lb_hash_select_tx_port(struct team *team,
 119                                                 unsigned char hash)
 120 {
 121         int port_index = team_num_to_port_index(team, hash);
 122
 123         return team_get_port_by_index_rcu(team, port_index);
 124 }
 125
 126 /* Hash to port mapping select tx port */
 127 static struct team_port *lb_htpm_select_tx_port(struct team *team,
 128                                                 unsigned char hash)
 129 {
 130         struct lb_priv *lb_priv = get_lb_priv(team);
 131         struct team_port *port;
 132
 133         port = rcu_dereference_bh(LB_HTPM_PORT_BY_HASH(lb_priv, hash));
 134         if (likely(port))
 135                 return port;
 136         /* If no valid port in the table, fall back to simple hash */
 137         return lb_hash_select_tx_port(team, hash);
 138 }
 139
 140 struct lb_select_tx_port {
 141         char *name;
 142         lb_select_tx_port_func_t *func;
 143 };
 144
 145 static const struct lb_select_tx_port lb_select_tx_port_list[] = {
 146         {
 147                 .name = "hash",
 148                 .func = lb_hash_select_tx_port,
 149         },
 150         {
 151                 .name = "hash_to_port_mapping",
 152                 .func = lb_htpm_select_tx_port,
 153         },
 154 };
 155 #define LB_SELECT_TX_PORT_LIST_COUNT ARRAY_SIZE(lb_select_tx_port_list)
 156
 157 static char *lb_select_tx_port_get_name(lb_select_tx_port_func_t *func)
 158 {
 159         int i;
 160
 161         for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
 162                 const struct lb_select_tx_port *item;
 163
 164                 item = &lb_select_tx_port_list[i];
 165                 if (item->func == func)
 166                         return item->name;
 167         }
 168         return NULL;
 169 }
 170
 171 static lb_select_tx_port_func_t *lb_select_tx_port_get_func(const char *name)
 172 {
 173         int i;
 174
 175         for (i = 0; i < LB_SELECT_TX_PORT_LIST_COUNT; i++) {
 176                 const struct lb_select_tx_port *item;
 177
 178                 item = &lb_select_tx_port_list[i];
 179                 if (!strcmp(item->name, name))
 180                         return item->func;
 181         }
 182         return NULL;
 183 }
 184
 185 static unsigned int lb_get_skb_hash(struct lb_priv *lb_priv,
 186                                     struct sk_buff *skb)
 187 {
 188         struct bpf_prog *fp;
 189         uint32_t lhash;
 190         unsigned char *c;
 191
 192         fp = rcu_dereference_bh(lb_priv->fp);
 193         if (unlikely(!fp))
 194                 return 0;
 195         lhash = bpf_prog_run(fp, skb);
 196         c = (char *) &lhash;
 197         return c[0] ^ c[1] ^ c[2] ^ c[3];
 198 }
 199
 200 static void lb_update_tx_stats(unsigned int tx_bytes, struct lb_priv *lb_priv,
 201                                struct lb_port_priv *lb_port_priv,
 202                                unsigned char hash)
 203 {
 204         struct lb_pcpu_stats *pcpu_stats;
 205         struct lb_stats *port_stats;
 206         struct lb_stats *hash_stats;
 207
 208         pcpu_stats = this_cpu_ptr(lb_priv->pcpu_stats);
 209         port_stats = this_cpu_ptr(lb_port_priv->pcpu_stats);
 210         hash_stats = &pcpu_stats->hash_stats[hash];
 211         u64_stats_update_begin(&pcpu_stats->syncp);
 212         port_stats->tx_bytes += tx_bytes;
 213         hash_stats->tx_bytes += tx_bytes;
 214         u64_stats_update_end(&pcpu_stats->syncp);
 215 }
 216
 217 static bool lb_transmit(struct team *team, struct sk_buff *skb)
 218 {
 219         struct lb_priv *lb_priv = get_lb_priv(team);
 220         lb_select_tx_port_func_t *select_tx_port_func;
 221         struct team_port *port;
 222         unsigned char hash;
 223         unsigned int tx_bytes = skb->len;
 224
 225         hash = lb_get_skb_hash(lb_priv, skb);
 226         select_tx_port_func = rcu_dereference_bh(lb_priv->select_tx_port_func);
 227         port = select_tx_port_func(team, hash);
 228         if (unlikely(!port))
 229                 goto drop;
 230         if (team_dev_queue_xmit(team, port, skb))
 231                 return false;
 232         lb_update_tx_stats(tx_bytes, lb_priv, get_lb_port_priv(port), hash);
 233         return true;
 234
 235 drop:
 236         dev_kfree_skb_any(skb);
 237         return false;
 238 }
 239
 240 static void lb_bpf_func_get(struct team *team, struct team_gsetter_ctx *ctx)
 241 {
 242         struct lb_priv *lb_priv = get_lb_priv(team);
 243
 244         if (!lb_priv->ex->orig_fprog) {
 245                 ctx->data.bin_val.len = 0;
 246                 ctx->data.bin_val.ptr = NULL;
 247                 return;
 248         }
 249         ctx->data.bin_val.len = lb_priv->ex->orig_fprog->len *
 250                                 sizeof(struct sock_filter);
 251         ctx->data.bin_val.ptr = lb_priv->ex->orig_fprog->filter;
 252 }
 253
 254 static int __fprog_create(struct sock_fprog_kern **pfprog, u32 data_len,
 255                           const void *data)
 256 {
 257         struct sock_fprog_kern *fprog;
 258         struct sock_filter *filter = (struct sock_filter *) data;
 259
 260         if (data_len % sizeof(struct sock_filter))
 261                 return -EINVAL;
 262         fprog = kmalloc(sizeof(*fprog), GFP_KERNEL);
 263         if (!fprog)
 264                 return -ENOMEM;
 265         fprog->filter = kmemdup(filter, data_len, GFP_KERNEL);
 266         if (!fprog->filter) {
 267                 kfree(fprog);
 268                 return -ENOMEM;
 269         }
 270         fprog->len = data_len / sizeof(struct sock_filter);
 271         *pfprog = fprog;
 272         return 0;
 273 }
 274
 275 static void __fprog_destroy(struct sock_fprog_kern *fprog)
 276 {
 277         kfree(fprog->filter);
 278         kfree(fprog);
 279 }
 280
 281 static int lb_bpf_func_set(struct team *team, struct team_gsetter_ctx *ctx)
 282 {
 283         struct lb_priv *lb_priv = get_lb_priv(team);
 284         struct bpf_prog *fp = NULL;
 285         struct bpf_prog *orig_fp = NULL;
 286         struct sock_fprog_kern *fprog = NULL;
 287         int err;
 288
 289         if (ctx->data.bin_val.len) {
 290                 err = __fprog_create(&fprog, ctx->data.bin_val.len,
 291                                      ctx->data.bin_val.ptr);
 292                 if (err)
 293                         return err;
 294                 err = bpf_prog_create(&fp, fprog);
 295                 if (err) {
 296                         __fprog_destroy(fprog);
 297                         return err;
 298                 }
 299         }
 300
 301         if (lb_priv->ex->orig_fprog) {
 302                 /* Clear old filter data */
 303                 __fprog_destroy(lb_priv->ex->orig_fprog);
 304                 orig_fp = rcu_dereference_protected(lb_priv->fp,
 305                                                 lockdep_is_held(&team->lock));
 306         }
 307
 308         rcu_assign_pointer(lb_priv->fp, fp);
 309         lb_priv->ex->orig_fprog = fprog;
 310
 311         if (orig_fp) {
 312                 synchronize_rcu();
 313                 bpf_prog_destroy(orig_fp);
 314         }
 315         return 0;
 316 }
 317
 318 static void lb_bpf_func_free(struct team *team)
 319 {
 320         struct lb_priv *lb_priv = get_lb_priv(team);
 321         struct bpf_prog *fp;
 322
 323         if (!lb_priv->ex->orig_fprog)
 324                 return;
 325
 326         __fprog_destroy(lb_priv->ex->orig_fprog);
 327         fp = rcu_dereference_protected(lb_priv->fp,
 328                                        lockdep_is_held(&team->lock));
 329         bpf_prog_destroy(fp);
 330 }
 331
 332 static void lb_tx_method_get(struct team *team, struct team_gsetter_ctx *ctx)
 333 {
 334         struct lb_priv *lb_priv = get_lb_priv(team);
 335         lb_select_tx_port_func_t *func;
 336         char *name;
 337
 338         func = rcu_dereference_protected(lb_priv->select_tx_port_func,
 339                                          lockdep_is_held(&team->lock));
 340         name = lb_select_tx_port_get_name(func);
 341         BUG_ON(!name);
 342         ctx->data.str_val = name;
 343 }
 344
 345 static int lb_tx_method_set(struct team *team, struct team_gsetter_ctx *ctx)
 346 {
 347         struct lb_priv *lb_priv = get_lb_priv(team);
 348         lb_select_tx_port_func_t *func;
 349
 350         func = lb_select_tx_port_get_func(ctx->data.str_val);
 351         if (!func)
 352                 return -EINVAL;
 353         rcu_assign_pointer(lb_priv->select_tx_port_func, func);
 354         return 0;
 355 }
 356
 357 static void lb_tx_hash_to_port_mapping_init(struct team *team,
 358                                             struct team_option_inst_info *info)
 359 {
 360         struct lb_priv *lb_priv = get_lb_priv(team);
 361         unsigned char hash = info->array_index;
 362
 363         LB_HTPM_OPT_INST_INFO_BY_HASH(lb_priv, hash) = info;
 364 }
 365
 366 static void lb_tx_hash_to_port_mapping_get(struct team *team,
 367                                            struct team_gsetter_ctx *ctx)
 368 {
 369         struct lb_priv *lb_priv = get_lb_priv(team);
 370         struct team_port *port;
 371         unsigned char hash = ctx->info->array_index;
 372
 373         port = LB_HTPM_PORT_BY_HASH(lb_priv, hash);
 374         ctx->data.u32_val = port ? port->dev->ifindex : 0;
 375 }
 376
 377 static int lb_tx_hash_to_port_mapping_set(struct team *team,
 378                                           struct team_gsetter_ctx *ctx)
 379 {
 380         struct lb_priv *lb_priv = get_lb_priv(team);
 381         struct team_port *port;
 382         unsigned char hash = ctx->info->array_index;
 383
 384         list_for_each_entry(port, &team->port_list, list) {
 385                 if (ctx->data.u32_val == port->dev->ifindex &&
 386                     team_port_enabled(port)) {
 387                         rcu_assign_pointer(LB_HTPM_PORT_BY_HASH(lb_priv, hash),
 388                                            port);
 389                         return 0;
 390                 }
 391         }
 392         return -ENODEV;
 393 }
 394
 395 static void lb_hash_stats_init(struct team *team,
 396                                struct team_option_inst_info *info)
 397 {
 398         struct lb_priv *lb_priv = get_lb_priv(team);
 399         unsigned char hash = info->array_index;
 400
 401         lb_priv->ex->stats.info[hash].opt_inst_info = info;
 402 }
 403
 404 static void lb_hash_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
 405 {
 406         struct lb_priv *lb_priv = get_lb_priv(team);
 407         unsigned char hash = ctx->info->array_index;
 408
 409         ctx->data.bin_val.ptr = &lb_priv->ex->stats.info[hash].stats;
 410         ctx->data.bin_val.len = sizeof(struct lb_stats);
 411 }
 412
 413 static void lb_port_stats_init(struct team *team,
 414                                struct team_option_inst_info *info)
 415 {
 416         struct team_port *port = info->port;
 417         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 418
 419         lb_port_priv->stats_info.opt_inst_info = info;
 420 }
 421
 422 static void lb_port_stats_get(struct team *team, struct team_gsetter_ctx *ctx)
 423 {
 424         struct team_port *port = ctx->info->port;
 425         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 426
 427         ctx->data.bin_val.ptr = &lb_port_priv->stats_info.stats;
 428         ctx->data.bin_val.len = sizeof(struct lb_stats);
 429 }
 430
 431 static void __lb_stats_info_refresh_prepare(struct lb_stats_info *s_info)
 432 {
 433         memcpy(&s_info->last_stats, &s_info->stats, sizeof(struct lb_stats));
 434         memset(&s_info->stats, 0, sizeof(struct lb_stats));
 435 }
 436
 437 static bool __lb_stats_info_refresh_check(struct lb_stats_info *s_info,
 438                                           struct team *team)
 439 {
 440         if (memcmp(&s_info->last_stats, &s_info->stats,
 441             sizeof(struct lb_stats))) {
 442                 team_option_inst_set_change(s_info->opt_inst_info);
 443                 return true;
 444         }
 445         return false;
 446 }
 447
 448 static void __lb_one_cpu_stats_add(struct lb_stats *acc_stats,
 449                                    struct lb_stats *cpu_stats,
 450                                    struct u64_stats_sync *syncp)
 451 {
 452         unsigned int start;
 453         struct lb_stats tmp;
 454
 455         do {
 456                 start = u64_stats_fetch_begin(syncp);
 457                 tmp.tx_bytes = cpu_stats->tx_bytes;
 458         } while (u64_stats_fetch_retry(syncp, start));
 459         acc_stats->tx_bytes += tmp.tx_bytes;
 460 }
 461
 462 static void lb_stats_refresh(struct work_struct *work)
 463 {
 464         struct team *team;
 465         struct lb_priv *lb_priv;
 466         struct lb_priv_ex *lb_priv_ex;
 467         struct lb_pcpu_stats *pcpu_stats;
 468         struct lb_stats *stats;
 469         struct lb_stats_info *s_info;
 470         struct team_port *port;
 471         bool changed = false;
 472         int i;
 473         int j;
 474
 475         lb_priv_ex = container_of(work, struct lb_priv_ex,
 476                                   stats.refresh_dw.work);
 477
 478         team = lb_priv_ex->team;
 479         lb_priv = get_lb_priv(team);
 480
 481         if (!mutex_trylock(&team->lock)) {
 482                 schedule_delayed_work(&lb_priv_ex->stats.refresh_dw, 0);
 483                 return;
 484         }
 485
 486         for (j = 0; j < LB_TX_HASHTABLE_SIZE; j++) {
 487                 s_info = &lb_priv->ex->stats.info[j];
 488                 __lb_stats_info_refresh_prepare(s_info);
 489                 for_each_possible_cpu(i) {
 490                         pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 491                         stats = &pcpu_stats->hash_stats[j];
 492                         __lb_one_cpu_stats_add(&s_info->stats, stats,
 493                                                &pcpu_stats->syncp);
 494                 }
 495                 changed |= __lb_stats_info_refresh_check(s_info, team);
 496         }
 497
 498         list_for_each_entry(port, &team->port_list, list) {
 499                 struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 500
 501                 s_info = &lb_port_priv->stats_info;
 502                 __lb_stats_info_refresh_prepare(s_info);
 503                 for_each_possible_cpu(i) {
 504                         pcpu_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 505                         stats = per_cpu_ptr(lb_port_priv->pcpu_stats, i);
 506                         __lb_one_cpu_stats_add(&s_info->stats, stats,
 507                                                &pcpu_stats->syncp);
 508                 }
 509                 changed |= __lb_stats_info_refresh_check(s_info, team);
 510         }
 511
 512         if (changed)
 513                 team_options_change_check(team);
 514
 515         schedule_delayed_work(&lb_priv_ex->stats.refresh_dw,
 516                               (lb_priv_ex->stats.refresh_interval * HZ) / 10);
 517
 518         mutex_unlock(&team->lock);
 519 }
 520
 521 static void lb_stats_refresh_interval_get(struct team *team,
 522                                           struct team_gsetter_ctx *ctx)
 523 {
 524         struct lb_priv *lb_priv = get_lb_priv(team);
 525
 526         ctx->data.u32_val = lb_priv->ex->stats.refresh_interval;
 527 }
 528
 529 static int lb_stats_refresh_interval_set(struct team *team,
 530                                          struct team_gsetter_ctx *ctx)
 531 {
 532         struct lb_priv *lb_priv = get_lb_priv(team);
 533         unsigned int interval;
 534
 535         interval = ctx->data.u32_val;
 536         if (lb_priv->ex->stats.refresh_interval == interval)
 537                 return 0;
 538         lb_priv->ex->stats.refresh_interval = interval;
 539         if (interval)
 540                 schedule_delayed_work(&lb_priv->ex->stats.refresh_dw, 0);
 541         else
 542                 cancel_delayed_work(&lb_priv->ex->stats.refresh_dw);
 543         return 0;
 544 }
 545
 546 static const struct team_option lb_options[] = {
 547         {
 548                 .name = "bpf_hash_func",
 549                 .type = TEAM_OPTION_TYPE_BINARY,
 550                 .getter = lb_bpf_func_get,
 551                 .setter = lb_bpf_func_set,
 552         },
 553         {
 554                 .name = "lb_tx_method",
 555                 .type = TEAM_OPTION_TYPE_STRING,
 556                 .getter = lb_tx_method_get,
 557                 .setter = lb_tx_method_set,
 558         },
 559         {
 560                 .name = "lb_tx_hash_to_port_mapping",
 561                 .array_size = LB_TX_HASHTABLE_SIZE,
 562                 .type = TEAM_OPTION_TYPE_U32,
 563                 .init = lb_tx_hash_to_port_mapping_init,
 564                 .getter = lb_tx_hash_to_port_mapping_get,
 565                 .setter = lb_tx_hash_to_port_mapping_set,
 566         },
 567         {
 568                 .name = "lb_hash_stats",
 569                 .array_size = LB_TX_HASHTABLE_SIZE,
 570                 .type = TEAM_OPTION_TYPE_BINARY,
 571                 .init = lb_hash_stats_init,
 572                 .getter = lb_hash_stats_get,
 573         },
 574         {
 575                 .name = "lb_port_stats",
 576                 .per_port = true,
 577                 .type = TEAM_OPTION_TYPE_BINARY,
 578                 .init = lb_port_stats_init,
 579                 .getter = lb_port_stats_get,
 580         },
 581         {
 582                 .name = "lb_stats_refresh_interval",
 583                 .type = TEAM_OPTION_TYPE_U32,
 584                 .getter = lb_stats_refresh_interval_get,
 585                 .setter = lb_stats_refresh_interval_set,
 586         },
 587 };
 588
 589 static int lb_init(struct team *team)
 590 {
 591         struct lb_priv *lb_priv = get_lb_priv(team);
 592         lb_select_tx_port_func_t *func;
 593         int i, err;
 594
 595         /* set default tx port selector */
 596         func = lb_select_tx_port_get_func("hash");
 597         BUG_ON(!func);
 598         rcu_assign_pointer(lb_priv->select_tx_port_func, func);
 599
 600         lb_priv->ex = kzalloc(sizeof(*lb_priv->ex), GFP_KERNEL);
 601         if (!lb_priv->ex)
 602                 return -ENOMEM;
 603         lb_priv->ex->team = team;
 604
 605         lb_priv->pcpu_stats = alloc_percpu(struct lb_pcpu_stats);
 606         if (!lb_priv->pcpu_stats) {
 607                 err = -ENOMEM;
 608                 goto err_alloc_pcpu_stats;
 609         }
 610
 611         for_each_possible_cpu(i) {
 612                 struct lb_pcpu_stats *team_lb_stats;
 613                 team_lb_stats = per_cpu_ptr(lb_priv->pcpu_stats, i);
 614                 u64_stats_init(&team_lb_stats->syncp);
 615         }
 616
 617
 618         INIT_DELAYED_WORK(&lb_priv->ex->stats.refresh_dw, lb_stats_refresh);
 619
 620         err = team_options_register(team, lb_options, ARRAY_SIZE(lb_options));
 621         if (err)
 622                 goto err_options_register;
 623         return 0;
 624
 625 err_options_register:
 626         free_percpu(lb_priv->pcpu_stats);
 627 err_alloc_pcpu_stats:
 628         kfree(lb_priv->ex);
 629         return err;
 630 }
 631
 632 static void lb_exit(struct team *team)
 633 {
 634         struct lb_priv *lb_priv = get_lb_priv(team);
 635
 636         team_options_unregister(team, lb_options,
 637                                 ARRAY_SIZE(lb_options));
 638         lb_bpf_func_free(team);
 639         cancel_delayed_work_sync(&lb_priv->ex->stats.refresh_dw);
 640         free_percpu(lb_priv->pcpu_stats);
 641         kfree(lb_priv->ex);
 642 }
 643
 644 static int lb_port_enter(struct team *team, struct team_port *port)
 645 {
 646         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 647
 648         lb_port_priv->pcpu_stats = alloc_percpu(struct lb_stats);
 649         if (!lb_port_priv->pcpu_stats)
 650                 return -ENOMEM;
 651         return 0;
 652 }
 653
 654 static void lb_port_leave(struct team *team, struct team_port *port)
 655 {
 656         struct lb_port_priv *lb_port_priv = get_lb_port_priv(port);
 657
 658         free_percpu(lb_port_priv->pcpu_stats);
 659 }
 660
 661 static void lb_port_disabled(struct team *team, struct team_port *port)
 662 {
 663         lb_tx_hash_to_port_mapping_null_port(team, port);
 664 }
 665
 666 static const struct team_mode_ops lb_mode_ops = {
 667         .init                   = lb_init,
 668         .exit                   = lb_exit,
 669         .port_enter             = lb_port_enter,
 670         .port_leave             = lb_port_leave,
 671         .port_disabled          = lb_port_disabled,
 672         .receive                = lb_receive,
 673         .transmit               = lb_transmit,
 674 };
 675
 676 static const struct team_mode lb_mode = {
 677         .kind           = "loadbalance",
 678         .owner          = THIS_MODULE,
 679         .priv_size      = sizeof(struct lb_priv),
 680         .port_priv_size = sizeof(struct lb_port_priv),
 681         .ops            = &lb_mode_ops,
 682         .lag_tx_type    = NETDEV_LAG_TX_TYPE_HASH,
 683 };
 684
 685 static int __init lb_init_module(void)
 686 {
 687         return team_mode_register(&lb_mode);
 688 }
 689
 690 static void __exit lb_cleanup_module(void)
 691 {
 692         team_mode_unregister(&lb_mode);
 693 }
 694
 695 module_init(lb_init_module);
 696 module_exit(lb_cleanup_module);
 697
 698 MODULE_LICENSE("GPL v2");
 699 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
 700 MODULE_DESCRIPTION("Load-balancing mode for team");
 701 MODULE_ALIAS_TEAM_MODE("loadbalance");