target/linux/generic/files/drivers/net/phy/swconfig.c

   1 /*
   2  * swconfig.c: Switch configuration API
   3  *
   4  * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/list.h>
  21 #include <linux/if.h>
  22 #include <linux/if_ether.h>
  23 #include <linux/capability.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/switch.h>
  26 #include <linux/of.h>
  27 #include <linux/version.h>
  28 #include <uapi/linux/mii.h>
  29
  30 #define SWCONFIG_DEVNAME        "switch%d"
  31
  32 #include "swconfig_leds.c"
  33
  34 MODULE_AUTHOR("Felix Fietkau <nbd@nbd.name>");
  35 MODULE_LICENSE("GPL");
  36
  37 static int swdev_id;
  38 static struct list_head swdevs;
  39 static DEFINE_SPINLOCK(swdevs_lock);
  40 struct swconfig_callback;
  41
  42 struct swconfig_callback {
  43         struct sk_buff *msg;
  44         struct genlmsghdr *hdr;
  45         struct genl_info *info;
  46         int cmd;
  47
  48         /* callback for filling in the message data */
  49         int (*fill)(struct swconfig_callback *cb, void *arg);
  50
  51         /* callback for closing the message before sending it */
  52         int (*close)(struct swconfig_callback *cb, void *arg);
  53
  54         struct nlattr *nest[4];
  55         int args[4];
  56 };
  57
  58 /* defaults */
  59
  60 static int
  61 swconfig_get_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr,
  62                         struct switch_val *val)
  63 {
  64         int ret;
  65         if (val->port_vlan >= dev->vlans)
  66                 return -EINVAL;
  67
  68         if (!dev->ops->get_vlan_ports)
  69                 return -EOPNOTSUPP;
  70
  71         ret = dev->ops->get_vlan_ports(dev, val);
  72         return ret;
  73 }
  74
  75 static int
  76 swconfig_set_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr,
  77                         struct switch_val *val)
  78 {
  79         struct switch_port *ports = val->value.ports;
  80         const struct switch_dev_ops *ops = dev->ops;
  81         int i;
  82
  83         if (val->port_vlan >= dev->vlans)
  84                 return -EINVAL;
  85
  86         /* validate ports */
  87         if (val->len > dev->ports)
  88                 return -EINVAL;
  89
  90         if (!ops->set_vlan_ports)
  91                 return -EOPNOTSUPP;
  92
  93         for (i = 0; i < val->len; i++) {
  94                 if (ports[i].id >= dev->ports)
  95                         return -EINVAL;
  96
  97                 if (ops->set_port_pvid &&
  98                     !(ports[i].flags & (1 << SWITCH_PORT_FLAG_TAGGED)))
  99                         ops->set_port_pvid(dev, ports[i].id, val->port_vlan);
 100         }
 101
 102         return ops->set_vlan_ports(dev, val);
 103 }
 104
 105 static int
 106 swconfig_set_pvid(struct switch_dev *dev, const struct switch_attr *attr,
 107                         struct switch_val *val)
 108 {
 109         if (val->port_vlan >= dev->ports)
 110                 return -EINVAL;
 111
 112         if (!dev->ops->set_port_pvid)
 113                 return -EOPNOTSUPP;
 114
 115         return dev->ops->set_port_pvid(dev, val->port_vlan, val->value.i);
 116 }
 117
 118 static int
 119 swconfig_get_pvid(struct switch_dev *dev, const struct switch_attr *attr,
 120                         struct switch_val *val)
 121 {
 122         if (val->port_vlan >= dev->ports)
 123                 return -EINVAL;
 124
 125         if (!dev->ops->get_port_pvid)
 126                 return -EOPNOTSUPP;
 127
 128         return dev->ops->get_port_pvid(dev, val->port_vlan, &val->value.i);
 129 }
 130
 131 static int
 132 swconfig_set_link(struct switch_dev *dev, const struct switch_attr *attr,
 133                         struct switch_val *val)
 134 {
 135         if (!dev->ops->set_port_link)
 136                 return -EOPNOTSUPP;
 137
 138         return dev->ops->set_port_link(dev, val->port_vlan, val->value.link);
 139 }
 140
 141 static int
 142 swconfig_get_link(struct switch_dev *dev, const struct switch_attr *attr,
 143                         struct switch_val *val)
 144 {
 145         struct switch_port_link *link = val->value.link;
 146
 147         if (val->port_vlan >= dev->ports)
 148                 return -EINVAL;
 149
 150         if (!dev->ops->get_port_link)
 151                 return -EOPNOTSUPP;
 152
 153         memset(link, 0, sizeof(*link));
 154         return dev->ops->get_port_link(dev, val->port_vlan, link);
 155 }
 156
 157 static int
 158 swconfig_apply_config(struct switch_dev *dev, const struct switch_attr *attr,
 159                         struct switch_val *val)
 160 {
 161         /* don't complain if not supported by the switch driver */
 162         if (!dev->ops->apply_config)
 163                 return 0;
 164
 165         return dev->ops->apply_config(dev);
 166 }
 167
 168 static int
 169 swconfig_reset_switch(struct switch_dev *dev, const struct switch_attr *attr,
 170                         struct switch_val *val)
 171 {
 172         /* don't complain if not supported by the switch driver */
 173         if (!dev->ops->reset_switch)
 174                 return 0;
 175
 176         return dev->ops->reset_switch(dev);
 177 }
 178
 179 enum global_defaults {
 180         GLOBAL_APPLY,
 181         GLOBAL_RESET,
 182 };
 183
 184 enum vlan_defaults {
 185         VLAN_PORTS,
 186 };
 187
 188 enum port_defaults {
 189         PORT_PVID,
 190         PORT_LINK,
 191 };
 192
 193 static struct switch_attr default_global[] = {
 194         [GLOBAL_APPLY] = {
 195                 .type = SWITCH_TYPE_NOVAL,
 196                 .name = "apply",
 197                 .description = "Activate changes in the hardware",
 198                 .set = swconfig_apply_config,
 199         },
 200         [GLOBAL_RESET] = {
 201                 .type = SWITCH_TYPE_NOVAL,
 202                 .name = "reset",
 203                 .description = "Reset the switch",
 204                 .set = swconfig_reset_switch,
 205         }
 206 };
 207
 208 static struct switch_attr default_port[] = {
 209         [PORT_PVID] = {
 210                 .type = SWITCH_TYPE_INT,
 211                 .name = "pvid",
 212                 .description = "Primary VLAN ID",
 213                 .set = swconfig_set_pvid,
 214                 .get = swconfig_get_pvid,
 215         },
 216         [PORT_LINK] = {
 217                 .type = SWITCH_TYPE_LINK,
 218                 .name = "link",
 219                 .description = "Get port link information",
 220                 .set = swconfig_set_link,
 221                 .get = swconfig_get_link,
 222         }
 223 };
 224
 225 static struct switch_attr default_vlan[] = {
 226         [VLAN_PORTS] = {
 227                 .type = SWITCH_TYPE_PORTS,
 228                 .name = "ports",
 229                 .description = "VLAN port mapping",
 230                 .set = swconfig_set_vlan_ports,
 231                 .get = swconfig_get_vlan_ports,
 232         },
 233 };
 234
 235 static const struct switch_attr *
 236 swconfig_find_attr_by_name(const struct switch_attrlist *alist,
 237                                 const char *name)
 238 {
 239         int i;
 240
 241         for (i = 0; i < alist->n_attr; i++)
 242                 if (strcmp(name, alist->attr[i].name) == 0)
 243                         return &alist->attr[i];
 244
 245         return NULL;
 246 }
 247
 248 static void swconfig_defaults_init(struct switch_dev *dev)
 249 {
 250         const struct switch_dev_ops *ops = dev->ops;
 251
 252         dev->def_global = 0;
 253         dev->def_vlan = 0;
 254         dev->def_port = 0;
 255
 256         if (ops->get_vlan_ports || ops->set_vlan_ports)
 257                 set_bit(VLAN_PORTS, &dev->def_vlan);
 258
 259         if (ops->get_port_pvid || ops->set_port_pvid)
 260                 set_bit(PORT_PVID, &dev->def_port);
 261
 262         if (ops->get_port_link &&
 263             !swconfig_find_attr_by_name(&ops->attr_port, "link"))
 264                 set_bit(PORT_LINK, &dev->def_port);
 265
 266         /* always present, can be no-op */
 267         set_bit(GLOBAL_APPLY, &dev->def_global);
 268         set_bit(GLOBAL_RESET, &dev->def_global);
 269 }
 270
 271
 272 static struct genl_family switch_fam = {
 273         .id = GENL_ID_GENERATE,
 274         .name = "switch",
 275         .hdrsize = 0,
 276         .version = 1,
 277         .maxattr = SWITCH_ATTR_MAX,
 278 };
 279
 280 static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
 281         [SWITCH_ATTR_ID] = { .type = NLA_U32 },
 282         [SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
 283         [SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
 284         [SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
 285         [SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
 286         [SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
 287         [SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
 288         [SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
 289 };
 290
 291 static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
 292         [SWITCH_PORT_ID] = { .type = NLA_U32 },
 293         [SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
 294 };
 295
 296 static struct nla_policy link_policy[SWITCH_LINK_ATTR_MAX] = {
 297         [SWITCH_LINK_FLAG_DUPLEX] = { .type = NLA_FLAG },
 298         [SWITCH_LINK_FLAG_ANEG] = { .type = NLA_FLAG },
 299         [SWITCH_LINK_SPEED] = { .type = NLA_U32 },
 300 };
 301
 302 static inline void
 303 swconfig_lock(void)
 304 {
 305         spin_lock(&swdevs_lock);
 306 }
 307
 308 static inline void
 309 swconfig_unlock(void)
 310 {
 311         spin_unlock(&swdevs_lock);
 312 }
 313
 314 static struct switch_dev *
 315 swconfig_get_dev(struct genl_info *info)
 316 {
 317         struct switch_dev *dev = NULL;
 318         struct switch_dev *p;
 319         int id;
 320
 321         if (!info->attrs[SWITCH_ATTR_ID])
 322                 goto done;
 323
 324         id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
 325         swconfig_lock();
 326         list_for_each_entry(p, &swdevs, dev_list) {
 327                 if (id != p->id)
 328                         continue;
 329
 330                 dev = p;
 331                 break;
 332         }
 333         if (dev)
 334                 mutex_lock(&dev->sw_mutex);
 335         else
 336                 pr_debug("device %d not found\n", id);
 337         swconfig_unlock();
 338 done:
 339         return dev;
 340 }
 341
 342 static inline void
 343 swconfig_put_dev(struct switch_dev *dev)
 344 {
 345         mutex_unlock(&dev->sw_mutex);
 346 }
 347
 348 static int
 349 swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
 350 {
 351         struct switch_attr *op = arg;
 352         struct genl_info *info = cb->info;
 353         struct sk_buff *msg = cb->msg;
 354         int id = cb->args[0];
 355         void *hdr;
 356
 357         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 358                         NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
 359         if (IS_ERR(hdr))
 360                 return -1;
 361
 362         if (nla_put_u32(msg, SWITCH_ATTR_OP_ID, id))
 363                 goto nla_put_failure;
 364         if (nla_put_u32(msg, SWITCH_ATTR_OP_TYPE, op->type))
 365                 goto nla_put_failure;
 366         if (nla_put_string(msg, SWITCH_ATTR_OP_NAME, op->name))
 367                 goto nla_put_failure;
 368         if (op->description)
 369                 if (nla_put_string(msg, SWITCH_ATTR_OP_DESCRIPTION,
 370                         op->description))
 371                         goto nla_put_failure;
 372
 373         genlmsg_end(msg, hdr);
 374         return msg->len;
 375 nla_put_failure:
 376         genlmsg_cancel(msg, hdr);
 377         return -EMSGSIZE;
 378 }
 379
 380 /* spread multipart messages across multiple message buffers */
 381 static int
 382 swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
 383 {
 384         struct genl_info *info = cb->info;
 385         int restart = 0;
 386         int err;
 387
 388         do {
 389                 if (!cb->msg) {
 390                         cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 391                         if (cb->msg == NULL)
 392                                 goto error;
 393                 }
 394
 395                 if (!(cb->fill(cb, arg) < 0))
 396                         break;
 397
 398                 /* fill failed, check if this was already the second attempt */
 399                 if (restart)
 400                         goto error;
 401
 402                 /* try again in a new message, send the current one */
 403                 restart = 1;
 404                 if (cb->close) {
 405                         if (cb->close(cb, arg) < 0)
 406                                 goto error;
 407                 }
 408                 err = genlmsg_reply(cb->msg, info);
 409                 cb->msg = NULL;
 410                 if (err < 0)
 411                         goto error;
 412
 413         } while (restart);
 414
 415         return 0;
 416
 417 error:
 418         if (cb->msg)
 419                 nlmsg_free(cb->msg);
 420         return -1;
 421 }
 422
 423 static int
 424 swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
 425 {
 426         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 427         const struct switch_attrlist *alist;
 428         struct switch_dev *dev;
 429         struct swconfig_callback cb;
 430         int err = -EINVAL;
 431         int i;
 432
 433         /* defaults */
 434         struct switch_attr *def_list;
 435         unsigned long *def_active;
 436         int n_def;
 437
 438         dev = swconfig_get_dev(info);
 439         if (!dev)
 440                 return -EINVAL;
 441
 442         switch (hdr->cmd) {
 443         case SWITCH_CMD_LIST_GLOBAL:
 444                 alist = &dev->ops->attr_global;
 445                 def_list = default_global;
 446                 def_active = &dev->def_global;
 447                 n_def = ARRAY_SIZE(default_global);
 448                 break;
 449         case SWITCH_CMD_LIST_VLAN:
 450                 alist = &dev->ops->attr_vlan;
 451                 def_list = default_vlan;
 452                 def_active = &dev->def_vlan;
 453                 n_def = ARRAY_SIZE(default_vlan);
 454                 break;
 455         case SWITCH_CMD_LIST_PORT:
 456                 alist = &dev->ops->attr_port;
 457                 def_list = default_port;
 458                 def_active = &dev->def_port;
 459                 n_def = ARRAY_SIZE(default_port);
 460                 break;
 461         default:
 462                 WARN_ON(1);
 463                 goto out;
 464         }
 465
 466         memset(&cb, 0, sizeof(cb));
 467         cb.info = info;
 468         cb.fill = swconfig_dump_attr;
 469         for (i = 0; i < alist->n_attr; i++) {
 470                 if (alist->attr[i].disabled)
 471                         continue;
 472                 cb.args[0] = i;
 473                 err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
 474                 if (err < 0)
 475                         goto error;
 476         }
 477
 478         /* defaults */
 479         for (i = 0; i < n_def; i++) {
 480                 if (!test_bit(i, def_active))
 481                         continue;
 482                 cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
 483                 err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
 484                 if (err < 0)
 485                         goto error;
 486         }
 487         swconfig_put_dev(dev);
 488
 489         if (!cb.msg)
 490                 return 0;
 491
 492         return genlmsg_reply(cb.msg, info);
 493
 494 error:
 495         if (cb.msg)
 496                 nlmsg_free(cb.msg);
 497 out:
 498         swconfig_put_dev(dev);
 499         return err;
 500 }
 501
 502 static const struct switch_attr *
 503 swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
 504                 struct switch_val *val)
 505 {
 506         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 507         const struct switch_attrlist *alist;
 508         const struct switch_attr *attr = NULL;
 509         int attr_id;
 510
 511         /* defaults */
 512         struct switch_attr *def_list;
 513         unsigned long *def_active;
 514         int n_def;
 515
 516         if (!info->attrs[SWITCH_ATTR_OP_ID])
 517                 goto done;
 518
 519         switch (hdr->cmd) {
 520         case SWITCH_CMD_SET_GLOBAL:
 521         case SWITCH_CMD_GET_GLOBAL:
 522                 alist = &dev->ops->attr_global;
 523                 def_list = default_global;
 524                 def_active = &dev->def_global;
 525                 n_def = ARRAY_SIZE(default_global);
 526                 break;
 527         case SWITCH_CMD_SET_VLAN:
 528         case SWITCH_CMD_GET_VLAN:
 529                 alist = &dev->ops->attr_vlan;
 530                 def_list = default_vlan;
 531                 def_active = &dev->def_vlan;
 532                 n_def = ARRAY_SIZE(default_vlan);
 533                 if (!info->attrs[SWITCH_ATTR_OP_VLAN])
 534                         goto done;
 535                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
 536                 if (val->port_vlan >= dev->vlans)
 537                         goto done;
 538                 break;
 539         case SWITCH_CMD_SET_PORT:
 540         case SWITCH_CMD_GET_PORT:
 541                 alist = &dev->ops->attr_port;
 542                 def_list = default_port;
 543                 def_active = &dev->def_port;
 544                 n_def = ARRAY_SIZE(default_port);
 545                 if (!info->attrs[SWITCH_ATTR_OP_PORT])
 546                         goto done;
 547                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
 548                 if (val->port_vlan >= dev->ports)
 549                         goto done;
 550                 break;
 551         default:
 552                 WARN_ON(1);
 553                 goto done;
 554         }
 555
 556         if (!alist)
 557                 goto done;
 558
 559         attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
 560         if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
 561                 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
 562                 if (attr_id >= n_def)
 563                         goto done;
 564                 if (!test_bit(attr_id, def_active))
 565                         goto done;
 566                 attr = &def_list[attr_id];
 567         } else {
 568                 if (attr_id >= alist->n_attr)
 569                         goto done;
 570                 attr = &alist->attr[attr_id];
 571         }
 572
 573         if (attr->disabled)
 574                 attr = NULL;
 575
 576 done:
 577         if (!attr)
 578                 pr_debug("attribute lookup failed\n");
 579         val->attr = attr;
 580         return attr;
 581 }
 582
 583 static int
 584 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 585                 struct switch_val *val, int max)
 586 {
 587         struct nlattr *nla;
 588         int rem;
 589
 590         val->len = 0;
 591         nla_for_each_nested(nla, head, rem) {
 592                 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
 593                 struct switch_port *port = &val->value.ports[val->len];
 594
 595                 if (val->len >= max)
 596                         return -EINVAL;
 597
 598                 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
 599                                 port_policy))
 600                         return -EINVAL;
 601
 602                 if (!tb[SWITCH_PORT_ID])
 603                         return -EINVAL;
 604
 605                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 606                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 607                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 608                 val->len++;
 609         }
 610
 611         return 0;
 612 }
 613
 614 static int
 615 swconfig_parse_link(struct sk_buff *msg, struct nlattr *nla,
 616                     struct switch_port_link *link)
 617 {
 618         struct nlattr *tb[SWITCH_LINK_ATTR_MAX + 1];
 619
 620         if (nla_parse_nested(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy))
 621                 return -EINVAL;
 622
 623         link->duplex = !!tb[SWITCH_LINK_FLAG_DUPLEX];
 624         link->aneg = !!tb[SWITCH_LINK_FLAG_ANEG];
 625         link->speed = nla_get_u32(tb[SWITCH_LINK_SPEED]);
 626
 627         return 0;
 628 }
 629
 630 static int
 631 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 632 {
 633         const struct switch_attr *attr;
 634         struct switch_dev *dev;
 635         struct switch_val val;
 636         int err = -EINVAL;
 637
 638         if (!capable(CAP_NET_ADMIN))
 639                 return -EPERM;
 640
 641         dev = swconfig_get_dev(info);
 642         if (!dev)
 643                 return -EINVAL;
 644
 645         memset(&val, 0, sizeof(val));
 646         attr = swconfig_lookup_attr(dev, info, &val);
 647         if (!attr || !attr->set)
 648                 goto error;
 649
 650         val.attr = attr;
 651         switch (attr->type) {
 652         case SWITCH_TYPE_NOVAL:
 653                 break;
 654         case SWITCH_TYPE_INT:
 655                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
 656                         goto error;
 657                 val.value.i =
 658                         nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
 659                 break;
 660         case SWITCH_TYPE_STRING:
 661                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
 662                         goto error;
 663                 val.value.s =
 664                         nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
 665                 break;
 666         case SWITCH_TYPE_PORTS:
 667                 val.value.ports = dev->portbuf;
 668                 memset(dev->portbuf, 0,
 669                         sizeof(struct switch_port) * dev->ports);
 670
 671                 /* TODO: implement multipart? */
 672                 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
 673                         err = swconfig_parse_ports(skb,
 674                                 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS],
 675                                 &val, dev->ports);
 676                         if (err < 0)
 677                                 goto error;
 678                 } else {
 679                         val.len = 0;
 680                         err = 0;
 681                 }
 682                 break;
 683         case SWITCH_TYPE_LINK:
 684                 val.value.link = &dev->linkbuf;
 685                 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 686
 687                 if (info->attrs[SWITCH_ATTR_OP_VALUE_LINK]) {
 688                         err = swconfig_parse_link(skb,
 689                                                   info->attrs[SWITCH_ATTR_OP_VALUE_LINK],
 690                                                   val.value.link);
 691                         if (err < 0)
 692                                 goto error;
 693                 } else {
 694                         val.len = 0;
 695                         err = 0;
 696                 }
 697                 break;
 698         default:
 699                 goto error;
 700         }
 701
 702         err = attr->set(dev, attr, &val);
 703 error:
 704         swconfig_put_dev(dev);
 705         return err;
 706 }
 707
 708 static int
 709 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
 710 {
 711         if (cb->nest[0])
 712                 nla_nest_end(cb->msg, cb->nest[0]);
 713         return 0;
 714 }
 715
 716 static int
 717 swconfig_send_port(struct swconfig_callback *cb, void *arg)
 718 {
 719         const struct switch_port *port = arg;
 720         struct nlattr *p = NULL;
 721
 722         if (!cb->nest[0]) {
 723                 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
 724                 if (!cb->nest[0])
 725                         return -1;
 726         }
 727
 728         p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
 729         if (!p)
 730                 goto error;
 731
 732         if (nla_put_u32(cb->msg, SWITCH_PORT_ID, port->id))
 733                 goto nla_put_failure;
 734         if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
 735                 if (nla_put_flag(cb->msg, SWITCH_PORT_FLAG_TAGGED))
 736                         goto nla_put_failure;
 737         }
 738
 739         nla_nest_end(cb->msg, p);
 740         return 0;
 741
 742 nla_put_failure:
 743                 nla_nest_cancel(cb->msg, p);
 744 error:
 745         nla_nest_cancel(cb->msg, cb->nest[0]);
 746         return -1;
 747 }
 748
 749 static int
 750 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
 751                 const struct switch_val *val)
 752 {
 753         struct swconfig_callback cb;
 754         int err = 0;
 755         int i;
 756
 757         if (!val->value.ports)
 758                 return -EINVAL;
 759
 760         memset(&cb, 0, sizeof(cb));
 761         cb.cmd = attr;
 762         cb.msg = *msg;
 763         cb.info = info;
 764         cb.fill = swconfig_send_port;
 765         cb.close = swconfig_close_portlist;
 766
 767         cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
 768         for (i = 0; i < val->len; i++) {
 769                 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
 770                 if (err)
 771                         goto done;
 772         }
 773         err = val->len;
 774         swconfig_close_portlist(&cb, NULL);
 775         *msg = cb.msg;
 776
 777 done:
 778         return err;
 779 }
 780
 781 static int
 782 swconfig_send_link(struct sk_buff *msg, struct genl_info *info, int attr,
 783                    const struct switch_port_link *link)
 784 {
 785         struct nlattr *p = NULL;
 786         int err = 0;
 787
 788         p = nla_nest_start(msg, attr);
 789         if (link->link) {
 790                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_LINK))
 791                         goto nla_put_failure;
 792         }
 793         if (link->duplex) {
 794                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_DUPLEX))
 795                         goto nla_put_failure;
 796         }
 797         if (link->aneg) {
 798                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_ANEG))
 799                         goto nla_put_failure;
 800         }
 801         if (link->tx_flow) {
 802                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_TX_FLOW))
 803                         goto nla_put_failure;
 804         }
 805         if (link->rx_flow) {
 806                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_RX_FLOW))
 807                         goto nla_put_failure;
 808         }
 809         if (nla_put_u32(msg, SWITCH_LINK_SPEED, link->speed))
 810                 goto nla_put_failure;
 811         if (link->eee & ADVERTISED_100baseT_Full) {
 812                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_100BASET))
 813                         goto nla_put_failure;
 814         }
 815         if (link->eee & ADVERTISED_1000baseT_Full) {
 816                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_1000BASET))
 817                         goto nla_put_failure;
 818         }
 819         nla_nest_end(msg, p);
 820
 821         return err;
 822
 823 nla_put_failure:
 824         nla_nest_cancel(msg, p);
 825         return -1;
 826 }
 827
 828 static int
 829 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 830 {
 831         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 832         const struct switch_attr *attr;
 833         struct switch_dev *dev;
 834         struct sk_buff *msg = NULL;
 835         struct switch_val val;
 836         int err = -EINVAL;
 837         int cmd = hdr->cmd;
 838
 839         dev = swconfig_get_dev(info);
 840         if (!dev)
 841                 return -EINVAL;
 842
 843         memset(&val, 0, sizeof(val));
 844         attr = swconfig_lookup_attr(dev, info, &val);
 845         if (!attr || !attr->get)
 846                 goto error;
 847
 848         if (attr->type == SWITCH_TYPE_PORTS) {
 849                 val.value.ports = dev->portbuf;
 850                 memset(dev->portbuf, 0,
 851                         sizeof(struct switch_port) * dev->ports);
 852         } else if (attr->type == SWITCH_TYPE_LINK) {
 853                 val.value.link = &dev->linkbuf;
 854                 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 855         }
 856
 857         err = attr->get(dev, attr, &val);
 858         if (err)
 859                 goto error;
 860
 861         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 862         if (!msg)
 863                 goto error;
 864
 865         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 866                         0, cmd);
 867         if (IS_ERR(hdr))
 868                 goto nla_put_failure;
 869
 870         switch (attr->type) {
 871         case SWITCH_TYPE_INT:
 872                 if (nla_put_u32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i))
 873                         goto nla_put_failure;
 874                 break;
 875         case SWITCH_TYPE_STRING:
 876                 if (nla_put_string(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s))
 877                         goto nla_put_failure;
 878                 break;
 879         case SWITCH_TYPE_PORTS:
 880                 err = swconfig_send_ports(&msg, info,
 881                                 SWITCH_ATTR_OP_VALUE_PORTS, &val);
 882                 if (err < 0)
 883                         goto nla_put_failure;
 884                 break;
 885         case SWITCH_TYPE_LINK:
 886                 err = swconfig_send_link(msg, info,
 887                                          SWITCH_ATTR_OP_VALUE_LINK, val.value.link);
 888                 if (err < 0)
 889                         goto nla_put_failure;
 890                 break;
 891         default:
 892                 pr_debug("invalid type in attribute\n");
 893                 err = -EINVAL;
 894                 goto error;
 895         }
 896         genlmsg_end(msg, hdr);
 897         err = msg->len;
 898         if (err < 0)
 899                 goto nla_put_failure;
 900
 901         swconfig_put_dev(dev);
 902         return genlmsg_reply(msg, info);
 903
 904 nla_put_failure:
 905         if (msg)
 906                 nlmsg_free(msg);
 907 error:
 908         swconfig_put_dev(dev);
 909         if (!err)
 910                 err = -ENOMEM;
 911         return err;
 912 }
 913
 914 static int
 915 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 916                 const struct switch_dev *dev)
 917 {
 918         void *hdr;
 919
 920         hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
 921                         SWITCH_CMD_NEW_ATTR);
 922         if (IS_ERR(hdr))
 923                 return -1;
 924
 925         if (nla_put_u32(msg, SWITCH_ATTR_ID, dev->id))
 926                 goto nla_put_failure;
 927         if (nla_put_string(msg, SWITCH_ATTR_DEV_NAME, dev->devname))
 928                 goto nla_put_failure;
 929         if (nla_put_string(msg, SWITCH_ATTR_ALIAS, dev->alias))
 930                 goto nla_put_failure;
 931         if (nla_put_string(msg, SWITCH_ATTR_NAME, dev->name))
 932                 goto nla_put_failure;
 933         if (nla_put_u32(msg, SWITCH_ATTR_VLANS, dev->vlans))
 934                 goto nla_put_failure;
 935         if (nla_put_u32(msg, SWITCH_ATTR_PORTS, dev->ports))
 936                 goto nla_put_failure;
 937         if (nla_put_u32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port))
 938                 goto nla_put_failure;
 939
 940         genlmsg_end(msg, hdr);
 941         return msg->len;
 942 nla_put_failure:
 943         genlmsg_cancel(msg, hdr);
 944         return -EMSGSIZE;
 945 }
 946
 947 static int swconfig_dump_switches(struct sk_buff *skb,
 948                 struct netlink_callback *cb)
 949 {
 950         struct switch_dev *dev;
 951         int start = cb->args[0];
 952         int idx = 0;
 953
 954         swconfig_lock();
 955         list_for_each_entry(dev, &swdevs, dev_list) {
 956                 if (++idx <= start)
 957                         continue;
 958                 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).portid,
 959                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 960                                 dev) < 0)
 961                         break;
 962         }
 963         swconfig_unlock();
 964         cb->args[0] = idx;
 965
 966         return skb->len;
 967 }
 968
 969 static int
 970 swconfig_done(struct netlink_callback *cb)
 971 {
 972         return 0;
 973 }
 974
 975 static struct genl_ops swconfig_ops[] = {
 976         {
 977                 .cmd = SWITCH_CMD_LIST_GLOBAL,
 978                 .doit = swconfig_list_attrs,
 979                 .policy = switch_policy,
 980         },
 981         {
 982                 .cmd = SWITCH_CMD_LIST_VLAN,
 983                 .doit = swconfig_list_attrs,
 984                 .policy = switch_policy,
 985         },
 986         {
 987                 .cmd = SWITCH_CMD_LIST_PORT,
 988                 .doit = swconfig_list_attrs,
 989                 .policy = switch_policy,
 990         },
 991         {
 992                 .cmd = SWITCH_CMD_GET_GLOBAL,
 993                 .doit = swconfig_get_attr,
 994                 .policy = switch_policy,
 995         },
 996         {
 997                 .cmd = SWITCH_CMD_GET_VLAN,
 998                 .doit = swconfig_get_attr,
 999                 .policy = switch_policy,
1000         },
1001         {
1002                 .cmd = SWITCH_CMD_GET_PORT,
1003                 .doit = swconfig_get_attr,
1004                 .policy = switch_policy,
1005         },
1006         {
1007                 .cmd = SWITCH_CMD_SET_GLOBAL,
1008                 .flags = GENL_ADMIN_PERM,
1009                 .doit = swconfig_set_attr,
1010                 .policy = switch_policy,
1011         },
1012         {
1013                 .cmd = SWITCH_CMD_SET_VLAN,
1014                 .flags = GENL_ADMIN_PERM,
1015                 .doit = swconfig_set_attr,
1016                 .policy = switch_policy,
1017         },
1018         {
1019                 .cmd = SWITCH_CMD_SET_PORT,
1020                 .flags = GENL_ADMIN_PERM,
1021                 .doit = swconfig_set_attr,
1022                 .policy = switch_policy,
1023         },
1024         {
1025                 .cmd = SWITCH_CMD_GET_SWITCH,
1026                 .dumpit = swconfig_dump_switches,
1027                 .policy = switch_policy,
1028                 .done = swconfig_done,
1029         }
1030 };
1031
1032 int
1033 register_switch(struct switch_dev *dev, struct net_device *netdev)
1034 {
1035         struct switch_dev *sdev;
1036         const int max_switches = 8 * sizeof(unsigned long);
1037         unsigned long in_use = 0;
1038         int err;
1039         int i;
1040
1041         INIT_LIST_HEAD(&dev->dev_list);
1042         if (netdev) {
1043                 dev->netdev = netdev;
1044                 if (!dev->alias)
1045                         dev->alias = netdev->name;
1046         }
1047         BUG_ON(!dev->alias);
1048
1049         if (dev->ports > 0) {
1050                 dev->portbuf = kzalloc(sizeof(struct switch_port) *
1051                                 dev->ports, GFP_KERNEL);
1052                 if (!dev->portbuf)
1053                         return -ENOMEM;
1054         }
1055         swconfig_defaults_init(dev);
1056         mutex_init(&dev->sw_mutex);
1057         swconfig_lock();
1058         dev->id = ++swdev_id;
1059
1060         list_for_each_entry(sdev, &swdevs, dev_list) {
1061                 if (!sscanf(sdev->devname, SWCONFIG_DEVNAME, &i))
1062                         continue;
1063                 if (i < 0 || i > max_switches)
1064                         continue;
1065
1066                 set_bit(i, &in_use);
1067         }
1068         i = find_first_zero_bit(&in_use, max_switches);
1069
1070         if (i == max_switches) {
1071                 swconfig_unlock();
1072                 return -ENFILE;
1073         }
1074
1075         /* fill device name */
1076         snprintf(dev->devname, IFNAMSIZ, SWCONFIG_DEVNAME, i);
1077
1078         list_add_tail(&dev->dev_list, &swdevs);
1079         swconfig_unlock();
1080
1081         err = swconfig_create_led_trigger(dev);
1082         if (err)
1083                 return err;
1084
1085         return 0;
1086 }
1087 EXPORT_SYMBOL_GPL(register_switch);
1088
1089 void
1090 unregister_switch(struct switch_dev *dev)
1091 {
1092         swconfig_destroy_led_trigger(dev);
1093         kfree(dev->portbuf);
1094         mutex_lock(&dev->sw_mutex);
1095         swconfig_lock();
1096         list_del(&dev->dev_list);
1097         swconfig_unlock();
1098         mutex_unlock(&dev->sw_mutex);
1099 }
1100 EXPORT_SYMBOL_GPL(unregister_switch);
1101
1102 int
1103 switch_generic_set_link(struct switch_dev *dev, int port,
1104                         struct switch_port_link *link)
1105 {
1106         if (WARN_ON(!dev->ops->phy_write16))
1107                 return -ENOTSUPP;
1108
1109         /* Generic implementation */
1110         if (link->aneg) {
1111                 dev->ops->phy_write16(dev, port, MII_BMCR, 0x0000);
1112                 dev->ops->phy_write16(dev, port, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
1113         } else {
1114                 u16 bmcr = 0;
1115
1116                 if (link->duplex)
1117                         bmcr |= BMCR_FULLDPLX;
1118
1119                 switch (link->speed) {
1120                 case SWITCH_PORT_SPEED_10:
1121                         break;
1122                 case SWITCH_PORT_SPEED_100:
1123                         bmcr |= BMCR_SPEED100;
1124                         break;
1125                 case SWITCH_PORT_SPEED_1000:
1126                         bmcr |= BMCR_SPEED1000;
1127                         break;
1128                 default:
1129                         return -ENOTSUPP;
1130                 }
1131
1132                 dev->ops->phy_write16(dev, port, MII_BMCR, bmcr);
1133         }
1134
1135         return 0;
1136 }
1137
1138 static int __init
1139 swconfig_init(void)
1140 {
1141         INIT_LIST_HEAD(&swdevs);
1142
1143         return genl_register_family_with_ops(&switch_fam, swconfig_ops);
1144 }
1145
1146 static void __exit
1147 swconfig_exit(void)
1148 {
1149         genl_unregister_family(&switch_fam);
1150 }
1151
1152 module_init(swconfig_init);
1153 module_exit(swconfig_exit);
1154