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         unsigned 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;
 594
 595                 if (val->len >= max)
 596                         return -EINVAL;
 597
 598                 port = &val->value.ports[val->len];
 599
 600                 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
 601                                 port_policy))
 602                         return -EINVAL;
 603
 604                 if (!tb[SWITCH_PORT_ID])
 605                         return -EINVAL;
 606
 607                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 608                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 609                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 610                 val->len++;
 611         }
 612
 613         return 0;
 614 }
 615
 616 static int
 617 swconfig_parse_link(struct sk_buff *msg, struct nlattr *nla,
 618                     struct switch_port_link *link)
 619 {
 620         struct nlattr *tb[SWITCH_LINK_ATTR_MAX + 1];
 621
 622         if (nla_parse_nested(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy))
 623                 return -EINVAL;
 624
 625         link->duplex = !!tb[SWITCH_LINK_FLAG_DUPLEX];
 626         link->aneg = !!tb[SWITCH_LINK_FLAG_ANEG];
 627         link->speed = nla_get_u32(tb[SWITCH_LINK_SPEED]);
 628
 629         return 0;
 630 }
 631
 632 static int
 633 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 634 {
 635         const struct switch_attr *attr;
 636         struct switch_dev *dev;
 637         struct switch_val val;
 638         int err = -EINVAL;
 639
 640         if (!capable(CAP_NET_ADMIN))
 641                 return -EPERM;
 642
 643         dev = swconfig_get_dev(info);
 644         if (!dev)
 645                 return -EINVAL;
 646
 647         memset(&val, 0, sizeof(val));
 648         attr = swconfig_lookup_attr(dev, info, &val);
 649         if (!attr || !attr->set)
 650                 goto error;
 651
 652         val.attr = attr;
 653         switch (attr->type) {
 654         case SWITCH_TYPE_NOVAL:
 655                 break;
 656         case SWITCH_TYPE_INT:
 657                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
 658                         goto error;
 659                 val.value.i =
 660                         nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
 661                 break;
 662         case SWITCH_TYPE_STRING:
 663                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
 664                         goto error;
 665                 val.value.s =
 666                         nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
 667                 break;
 668         case SWITCH_TYPE_PORTS:
 669                 val.value.ports = dev->portbuf;
 670                 memset(dev->portbuf, 0,
 671                         sizeof(struct switch_port) * dev->ports);
 672
 673                 /* TODO: implement multipart? */
 674                 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
 675                         err = swconfig_parse_ports(skb,
 676                                 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS],
 677                                 &val, dev->ports);
 678                         if (err < 0)
 679                                 goto error;
 680                 } else {
 681                         val.len = 0;
 682                         err = 0;
 683                 }
 684                 break;
 685         case SWITCH_TYPE_LINK:
 686                 val.value.link = &dev->linkbuf;
 687                 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 688
 689                 if (info->attrs[SWITCH_ATTR_OP_VALUE_LINK]) {
 690                         err = swconfig_parse_link(skb,
 691                                                   info->attrs[SWITCH_ATTR_OP_VALUE_LINK],
 692                                                   val.value.link);
 693                         if (err < 0)
 694                                 goto error;
 695                 } else {
 696                         val.len = 0;
 697                         err = 0;
 698                 }
 699                 break;
 700         default:
 701                 goto error;
 702         }
 703
 704         err = attr->set(dev, attr, &val);
 705 error:
 706         swconfig_put_dev(dev);
 707         return err;
 708 }
 709
 710 static int
 711 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
 712 {
 713         if (cb->nest[0])
 714                 nla_nest_end(cb->msg, cb->nest[0]);
 715         return 0;
 716 }
 717
 718 static int
 719 swconfig_send_port(struct swconfig_callback *cb, void *arg)
 720 {
 721         const struct switch_port *port = arg;
 722         struct nlattr *p = NULL;
 723
 724         if (!cb->nest[0]) {
 725                 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
 726                 if (!cb->nest[0])
 727                         return -1;
 728         }
 729
 730         p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
 731         if (!p)
 732                 goto error;
 733
 734         if (nla_put_u32(cb->msg, SWITCH_PORT_ID, port->id))
 735                 goto nla_put_failure;
 736         if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
 737                 if (nla_put_flag(cb->msg, SWITCH_PORT_FLAG_TAGGED))
 738                         goto nla_put_failure;
 739         }
 740
 741         nla_nest_end(cb->msg, p);
 742         return 0;
 743
 744 nla_put_failure:
 745                 nla_nest_cancel(cb->msg, p);
 746 error:
 747         nla_nest_cancel(cb->msg, cb->nest[0]);
 748         return -1;
 749 }
 750
 751 static int
 752 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
 753                 const struct switch_val *val)
 754 {
 755         struct swconfig_callback cb;
 756         int err = 0;
 757         int i;
 758
 759         if (!val->value.ports)
 760                 return -EINVAL;
 761
 762         memset(&cb, 0, sizeof(cb));
 763         cb.cmd = attr;
 764         cb.msg = *msg;
 765         cb.info = info;
 766         cb.fill = swconfig_send_port;
 767         cb.close = swconfig_close_portlist;
 768
 769         cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
 770         for (i = 0; i < val->len; i++) {
 771                 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
 772                 if (err)
 773                         goto done;
 774         }
 775         err = val->len;
 776         swconfig_close_portlist(&cb, NULL);
 777         *msg = cb.msg;
 778
 779 done:
 780         return err;
 781 }
 782
 783 static int
 784 swconfig_send_link(struct sk_buff *msg, struct genl_info *info, int attr,
 785                    const struct switch_port_link *link)
 786 {
 787         struct nlattr *p = NULL;
 788         int err = 0;
 789
 790         p = nla_nest_start(msg, attr);
 791         if (link->link) {
 792                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_LINK))
 793                         goto nla_put_failure;
 794         }
 795         if (link->duplex) {
 796                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_DUPLEX))
 797                         goto nla_put_failure;
 798         }
 799         if (link->aneg) {
 800                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_ANEG))
 801                         goto nla_put_failure;
 802         }
 803         if (link->tx_flow) {
 804                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_TX_FLOW))
 805                         goto nla_put_failure;
 806         }
 807         if (link->rx_flow) {
 808                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_RX_FLOW))
 809                         goto nla_put_failure;
 810         }
 811         if (nla_put_u32(msg, SWITCH_LINK_SPEED, link->speed))
 812                 goto nla_put_failure;
 813         if (link->eee & ADVERTISED_100baseT_Full) {
 814                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_100BASET))
 815                         goto nla_put_failure;
 816         }
 817         if (link->eee & ADVERTISED_1000baseT_Full) {
 818                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_1000BASET))
 819                         goto nla_put_failure;
 820         }
 821         nla_nest_end(msg, p);
 822
 823         return err;
 824
 825 nla_put_failure:
 826         nla_nest_cancel(msg, p);
 827         return -1;
 828 }
 829
 830 static int
 831 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 832 {
 833         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 834         const struct switch_attr *attr;
 835         struct switch_dev *dev;
 836         struct sk_buff *msg = NULL;
 837         struct switch_val val;
 838         int err = -EINVAL;
 839         int cmd = hdr->cmd;
 840
 841         dev = swconfig_get_dev(info);
 842         if (!dev)
 843                 return -EINVAL;
 844
 845         memset(&val, 0, sizeof(val));
 846         attr = swconfig_lookup_attr(dev, info, &val);
 847         if (!attr || !attr->get)
 848                 goto error;
 849
 850         if (attr->type == SWITCH_TYPE_PORTS) {
 851                 val.value.ports = dev->portbuf;
 852                 memset(dev->portbuf, 0,
 853                         sizeof(struct switch_port) * dev->ports);
 854         } else if (attr->type == SWITCH_TYPE_LINK) {
 855                 val.value.link = &dev->linkbuf;
 856                 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 857         }
 858
 859         err = attr->get(dev, attr, &val);
 860         if (err)
 861                 goto error;
 862
 863         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 864         if (!msg)
 865                 goto error;
 866
 867         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 868                         0, cmd);
 869         if (IS_ERR(hdr))
 870                 goto nla_put_failure;
 871
 872         switch (attr->type) {
 873         case SWITCH_TYPE_INT:
 874                 if (nla_put_u32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i))
 875                         goto nla_put_failure;
 876                 break;
 877         case SWITCH_TYPE_STRING:
 878                 if (nla_put_string(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s))
 879                         goto nla_put_failure;
 880                 break;
 881         case SWITCH_TYPE_PORTS:
 882                 err = swconfig_send_ports(&msg, info,
 883                                 SWITCH_ATTR_OP_VALUE_PORTS, &val);
 884                 if (err < 0)
 885                         goto nla_put_failure;
 886                 break;
 887         case SWITCH_TYPE_LINK:
 888                 err = swconfig_send_link(msg, info,
 889                                          SWITCH_ATTR_OP_VALUE_LINK, val.value.link);
 890                 if (err < 0)
 891                         goto nla_put_failure;
 892                 break;
 893         default:
 894                 pr_debug("invalid type in attribute\n");
 895                 err = -EINVAL;
 896                 goto nla_put_failure;
 897         }
 898         genlmsg_end(msg, hdr);
 899         err = msg->len;
 900         if (err < 0)
 901                 goto nla_put_failure;
 902
 903         swconfig_put_dev(dev);
 904         return genlmsg_reply(msg, info);
 905
 906 nla_put_failure:
 907         if (msg)
 908                 nlmsg_free(msg);
 909 error:
 910         swconfig_put_dev(dev);
 911         if (!err)
 912                 err = -ENOMEM;
 913         return err;
 914 }
 915
 916 static int
 917 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 918                 const struct switch_dev *dev)
 919 {
 920         struct nlattr *p = NULL, *m = NULL;
 921         void *hdr;
 922         int i;
 923
 924         hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
 925                         SWITCH_CMD_NEW_ATTR);
 926         if (IS_ERR(hdr))
 927                 return -1;
 928
 929         if (nla_put_u32(msg, SWITCH_ATTR_ID, dev->id))
 930                 goto nla_put_failure;
 931         if (nla_put_string(msg, SWITCH_ATTR_DEV_NAME, dev->devname))
 932                 goto nla_put_failure;
 933         if (nla_put_string(msg, SWITCH_ATTR_ALIAS, dev->alias))
 934                 goto nla_put_failure;
 935         if (nla_put_string(msg, SWITCH_ATTR_NAME, dev->name))
 936                 goto nla_put_failure;
 937         if (nla_put_u32(msg, SWITCH_ATTR_VLANS, dev->vlans))
 938                 goto nla_put_failure;
 939         if (nla_put_u32(msg, SWITCH_ATTR_PORTS, dev->ports))
 940                 goto nla_put_failure;
 941         if (nla_put_u32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port))
 942                 goto nla_put_failure;
 943
 944         m = nla_nest_start(msg, SWITCH_ATTR_PORTMAP);
 945         if (!m)
 946                 goto nla_put_failure;
 947         for (i = 0; i < dev->ports; i++) {
 948                 p = nla_nest_start(msg, SWITCH_ATTR_PORTS);
 949                 if (!p)
 950                         continue;
 951                 if (dev->portmap[i].s) {
 952                         if (nla_put_string(msg, SWITCH_PORTMAP_SEGMENT,
 953                                                 dev->portmap[i].s))
 954                                 goto nla_put_failure;
 955                         if (nla_put_u32(msg, SWITCH_PORTMAP_VIRT,
 956                                                 dev->portmap[i].virt))
 957                                 goto nla_put_failure;
 958                 }
 959                 nla_nest_end(msg, p);
 960         }
 961         nla_nest_end(msg, m);
 962         genlmsg_end(msg, hdr);
 963         return msg->len;
 964 nla_put_failure:
 965         genlmsg_cancel(msg, hdr);
 966         return -EMSGSIZE;
 967 }
 968
 969 static int swconfig_dump_switches(struct sk_buff *skb,
 970                 struct netlink_callback *cb)
 971 {
 972         struct switch_dev *dev;
 973         int start = cb->args[0];
 974         int idx = 0;
 975
 976         swconfig_lock();
 977         list_for_each_entry(dev, &swdevs, dev_list) {
 978                 if (++idx <= start)
 979                         continue;
 980                 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).portid,
 981                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 982                                 dev) < 0)
 983                         break;
 984         }
 985         swconfig_unlock();
 986         cb->args[0] = idx;
 987
 988         return skb->len;
 989 }
 990
 991 static int
 992 swconfig_done(struct netlink_callback *cb)
 993 {
 994         return 0;
 995 }
 996
 997 static struct genl_ops swconfig_ops[] = {
 998         {
 999                 .cmd = SWITCH_CMD_LIST_GLOBAL,
1000                 .doit = swconfig_list_attrs,
1001                 .policy = switch_policy,
1002         },
1003         {
1004                 .cmd = SWITCH_CMD_LIST_VLAN,
1005                 .doit = swconfig_list_attrs,
1006                 .policy = switch_policy,
1007         },
1008         {
1009                 .cmd = SWITCH_CMD_LIST_PORT,
1010                 .doit = swconfig_list_attrs,
1011                 .policy = switch_policy,
1012         },
1013         {
1014                 .cmd = SWITCH_CMD_GET_GLOBAL,
1015                 .doit = swconfig_get_attr,
1016                 .policy = switch_policy,
1017         },
1018         {
1019                 .cmd = SWITCH_CMD_GET_VLAN,
1020                 .doit = swconfig_get_attr,
1021                 .policy = switch_policy,
1022         },
1023         {
1024                 .cmd = SWITCH_CMD_GET_PORT,
1025                 .doit = swconfig_get_attr,
1026                 .policy = switch_policy,
1027         },
1028         {
1029                 .cmd = SWITCH_CMD_SET_GLOBAL,
1030                 .flags = GENL_ADMIN_PERM,
1031                 .doit = swconfig_set_attr,
1032                 .policy = switch_policy,
1033         },
1034         {
1035                 .cmd = SWITCH_CMD_SET_VLAN,
1036                 .flags = GENL_ADMIN_PERM,
1037                 .doit = swconfig_set_attr,
1038                 .policy = switch_policy,
1039         },
1040         {
1041                 .cmd = SWITCH_CMD_SET_PORT,
1042                 .flags = GENL_ADMIN_PERM,
1043                 .doit = swconfig_set_attr,
1044                 .policy = switch_policy,
1045         },
1046         {
1047                 .cmd = SWITCH_CMD_GET_SWITCH,
1048                 .dumpit = swconfig_dump_switches,
1049                 .policy = switch_policy,
1050                 .done = swconfig_done,
1051         }
1052 };
1053
1054 #ifdef CONFIG_OF
1055 void
1056 of_switch_load_portmap(struct switch_dev *dev)
1057 {
1058         struct device_node *port;
1059
1060         if (!dev->of_node)
1061                 return;
1062
1063         for_each_child_of_node(dev->of_node, port) {
1064                 const __be32 *prop;
1065                 const char *segment;
1066                 int size, phys;
1067
1068                 if (!of_device_is_compatible(port, "swconfig,port"))
1069                         continue;
1070
1071                 if (of_property_read_string(port, "swconfig,segment", &segment))
1072                         continue;
1073
1074                 prop = of_get_property(port, "swconfig,portmap", &size);
1075                 if (!prop)
1076                         continue;
1077
1078                 if (size != (2 * sizeof(*prop))) {
1079                         pr_err("%s: failed to parse port mapping\n",
1080                                         port->name);
1081                         continue;
1082                 }
1083
1084                 phys = be32_to_cpup(prop++);
1085                 if ((phys < 0) | (phys >= dev->ports)) {
1086                         pr_err("%s: physical port index out of range\n",
1087                                         port->name);
1088                         continue;
1089                 }
1090
1091                 dev->portmap[phys].s = kstrdup(segment, GFP_KERNEL);
1092                 dev->portmap[phys].virt = be32_to_cpup(prop);
1093                 pr_debug("Found port: %s, physical: %d, virtual: %d\n",
1094                         segment, phys, dev->portmap[phys].virt);
1095         }
1096 }
1097 #endif
1098
1099 int
1100 register_switch(struct switch_dev *dev, struct net_device *netdev)
1101 {
1102         struct switch_dev *sdev;
1103         const int max_switches = 8 * sizeof(unsigned long);
1104         unsigned long in_use = 0;
1105         int err;
1106         int i;
1107
1108         INIT_LIST_HEAD(&dev->dev_list);
1109         if (netdev) {
1110                 dev->netdev = netdev;
1111                 if (!dev->alias)
1112                         dev->alias = netdev->name;
1113         }
1114         BUG_ON(!dev->alias);
1115
1116         /* Make sure swdev_id doesn't overflow */
1117         if (swdev_id == INT_MAX) {
1118                 return -ENOMEM;
1119         }
1120
1121         if (dev->ports > 0) {
1122                 dev->portbuf = kzalloc(sizeof(struct switch_port) *
1123                                 dev->ports, GFP_KERNEL);
1124                 if (!dev->portbuf)
1125                         return -ENOMEM;
1126                 dev->portmap = kzalloc(sizeof(struct switch_portmap) *
1127                                 dev->ports, GFP_KERNEL);
1128                 if (!dev->portmap) {
1129                         kfree(dev->portbuf);
1130                         return -ENOMEM;
1131                 }
1132         }
1133         swconfig_defaults_init(dev);
1134         mutex_init(&dev->sw_mutex);
1135         swconfig_lock();
1136         dev->id = ++swdev_id;
1137
1138         list_for_each_entry(sdev, &swdevs, dev_list) {
1139                 if (!sscanf(sdev->devname, SWCONFIG_DEVNAME, &i))
1140                         continue;
1141                 if (i < 0 || i > max_switches)
1142                         continue;
1143
1144                 set_bit(i, &in_use);
1145         }
1146         i = find_first_zero_bit(&in_use, max_switches);
1147
1148         if (i == max_switches) {
1149                 swconfig_unlock();
1150                 return -ENFILE;
1151         }
1152
1153 #ifdef CONFIG_OF
1154         if (dev->ports)
1155                 of_switch_load_portmap(dev);
1156 #endif
1157
1158         /* fill device name */
1159         snprintf(dev->devname, IFNAMSIZ, SWCONFIG_DEVNAME, i);
1160
1161         list_add_tail(&dev->dev_list, &swdevs);
1162         swconfig_unlock();
1163
1164         err = swconfig_create_led_trigger(dev);
1165         if (err)
1166                 return err;
1167
1168         return 0;
1169 }
1170 EXPORT_SYMBOL_GPL(register_switch);
1171
1172 void
1173 unregister_switch(struct switch_dev *dev)
1174 {
1175         swconfig_destroy_led_trigger(dev);
1176         kfree(dev->portbuf);
1177         mutex_lock(&dev->sw_mutex);
1178         swconfig_lock();
1179         list_del(&dev->dev_list);
1180         swconfig_unlock();
1181         mutex_unlock(&dev->sw_mutex);
1182 }
1183 EXPORT_SYMBOL_GPL(unregister_switch);
1184
1185 int
1186 switch_generic_set_link(struct switch_dev *dev, int port,
1187                         struct switch_port_link *link)
1188 {
1189         if (WARN_ON(!dev->ops->phy_write16))
1190                 return -ENOTSUPP;
1191
1192         /* Generic implementation */
1193         if (link->aneg) {
1194                 dev->ops->phy_write16(dev, port, MII_BMCR, 0x0000);
1195                 dev->ops->phy_write16(dev, port, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
1196         } else {
1197                 u16 bmcr = 0;
1198
1199                 if (link->duplex)
1200                         bmcr |= BMCR_FULLDPLX;
1201
1202                 switch (link->speed) {
1203                 case SWITCH_PORT_SPEED_10:
1204                         break;
1205                 case SWITCH_PORT_SPEED_100:
1206                         bmcr |= BMCR_SPEED100;
1207                         break;
1208                 case SWITCH_PORT_SPEED_1000:
1209                         bmcr |= BMCR_SPEED1000;
1210                         break;
1211                 default:
1212                         return -ENOTSUPP;
1213                 }
1214
1215                 dev->ops->phy_write16(dev, port, MII_BMCR, bmcr);
1216         }
1217
1218         return 0;
1219 }
1220
1221 static int __init
1222 swconfig_init(void)
1223 {
1224         INIT_LIST_HEAD(&swdevs);
1225
1226         return genl_register_family_with_ops(&switch_fam, swconfig_ops);
1227 }
1228
1229 static void __exit
1230 swconfig_exit(void)
1231 {
1232         genl_unregister_family(&switch_fam);
1233 }
1234
1235 module_init(swconfig_init);
1236 module_exit(swconfig_exit);