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

   1 /*
   2  * swconfig.c: Switch configuration API
   3  *
   4  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   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
  29 #define SWCONFIG_DEVNAME        "switch%d"
  30
  31 #include "swconfig_leds.c"
  32
  33 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
  34 MODULE_LICENSE("GPL");
  35
  36 static int swdev_id;
  37 static struct list_head swdevs;
  38 static DEFINE_SPINLOCK(swdevs_lock);
  39 struct swconfig_callback;
  40
  41 struct swconfig_callback {
  42         struct sk_buff *msg;
  43         struct genlmsghdr *hdr;
  44         struct genl_info *info;
  45         int cmd;
  46
  47         /* callback for filling in the message data */
  48         int (*fill)(struct swconfig_callback *cb, void *arg);
  49
  50         /* callback for closing the message before sending it */
  51         int (*close)(struct swconfig_callback *cb, void *arg);
  52
  53         struct nlattr *nest[4];
  54         int args[4];
  55 };
  56
  57 /* defaults */
  58
  59 static int
  60 swconfig_get_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr,
  61                         struct switch_val *val)
  62 {
  63         int ret;
  64         if (val->port_vlan >= dev->vlans)
  65                 return -EINVAL;
  66
  67         if (!dev->ops->get_vlan_ports)
  68                 return -EOPNOTSUPP;
  69
  70         ret = dev->ops->get_vlan_ports(dev, val);
  71         return ret;
  72 }
  73
  74 static int
  75 swconfig_set_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr,
  76                         struct switch_val *val)
  77 {
  78         struct switch_port *ports = val->value.ports;
  79         const struct switch_dev_ops *ops = dev->ops;
  80         int i;
  81
  82         if (val->port_vlan >= dev->vlans)
  83                 return -EINVAL;
  84
  85         /* validate ports */
  86         if (val->len > dev->ports)
  87                 return -EINVAL;
  88
  89         if (!ops->set_vlan_ports)
  90                 return -EOPNOTSUPP;
  91
  92         for (i = 0; i < val->len; i++) {
  93                 if (ports[i].id >= dev->ports)
  94                         return -EINVAL;
  95
  96                 if (ops->set_port_pvid &&
  97                     !(ports[i].flags & (1 << SWITCH_PORT_FLAG_TAGGED)))
  98                         ops->set_port_pvid(dev, ports[i].id, val->port_vlan);
  99         }
 100
 101         return ops->set_vlan_ports(dev, val);
 102 }
 103
 104 static int
 105 swconfig_set_pvid(struct switch_dev *dev, const struct switch_attr *attr,
 106                         struct switch_val *val)
 107 {
 108         if (val->port_vlan >= dev->ports)
 109                 return -EINVAL;
 110
 111         if (!dev->ops->set_port_pvid)
 112                 return -EOPNOTSUPP;
 113
 114         return dev->ops->set_port_pvid(dev, val->port_vlan, val->value.i);
 115 }
 116
 117 static int
 118 swconfig_get_pvid(struct switch_dev *dev, const struct switch_attr *attr,
 119                         struct switch_val *val)
 120 {
 121         if (val->port_vlan >= dev->ports)
 122                 return -EINVAL;
 123
 124         if (!dev->ops->get_port_pvid)
 125                 return -EOPNOTSUPP;
 126
 127         return dev->ops->get_port_pvid(dev, val->port_vlan, &val->value.i);
 128 }
 129
 130 static int
 131 swconfig_set_link(struct switch_dev *dev, const struct switch_attr *attr,
 132                         struct switch_val *val)
 133 {
 134         if (!dev->ops->set_port_link)
 135                 return -EOPNOTSUPP;
 136
 137         return dev->ops->set_port_link(dev, val->port_vlan, val->value.link);
 138 }
 139
 140 static int
 141 swconfig_get_link(struct switch_dev *dev, const struct switch_attr *attr,
 142                         struct switch_val *val)
 143 {
 144         struct switch_port_link *link = val->value.link;
 145
 146         if (val->port_vlan >= dev->ports)
 147                 return -EINVAL;
 148
 149         if (!dev->ops->get_port_link)
 150                 return -EOPNOTSUPP;
 151
 152         memset(link, 0, sizeof(*link));
 153         return dev->ops->get_port_link(dev, val->port_vlan, link);
 154 }
 155
 156 static int
 157 swconfig_apply_config(struct switch_dev *dev, const struct switch_attr *attr,
 158                         struct switch_val *val)
 159 {
 160         /* don't complain if not supported by the switch driver */
 161         if (!dev->ops->apply_config)
 162                 return 0;
 163
 164         return dev->ops->apply_config(dev);
 165 }
 166
 167 static int
 168 swconfig_reset_switch(struct switch_dev *dev, const struct switch_attr *attr,
 169                         struct switch_val *val)
 170 {
 171         /* don't complain if not supported by the switch driver */
 172         if (!dev->ops->reset_switch)
 173                 return 0;
 174
 175         return dev->ops->reset_switch(dev);
 176 }
 177
 178 enum global_defaults {
 179         GLOBAL_APPLY,
 180         GLOBAL_RESET,
 181 };
 182
 183 enum vlan_defaults {
 184         VLAN_PORTS,
 185 };
 186
 187 enum port_defaults {
 188         PORT_PVID,
 189         PORT_LINK,
 190 };
 191
 192 static struct switch_attr default_global[] = {
 193         [GLOBAL_APPLY] = {
 194                 .type = SWITCH_TYPE_NOVAL,
 195                 .name = "apply",
 196                 .description = "Activate changes in the hardware",
 197                 .set = swconfig_apply_config,
 198         },
 199         [GLOBAL_RESET] = {
 200                 .type = SWITCH_TYPE_NOVAL,
 201                 .name = "reset",
 202                 .description = "Reset the switch",
 203                 .set = swconfig_reset_switch,
 204         }
 205 };
 206
 207 static struct switch_attr default_port[] = {
 208         [PORT_PVID] = {
 209                 .type = SWITCH_TYPE_INT,
 210                 .name = "pvid",
 211                 .description = "Primary VLAN ID",
 212                 .set = swconfig_set_pvid,
 213                 .get = swconfig_get_pvid,
 214         },
 215         [PORT_LINK] = {
 216                 .type = SWITCH_TYPE_LINK,
 217                 .name = "link",
 218                 .description = "Get port link information",
 219                 .set = swconfig_set_link,
 220                 .get = swconfig_get_link,
 221         }
 222 };
 223
 224 static struct switch_attr default_vlan[] = {
 225         [VLAN_PORTS] = {
 226                 .type = SWITCH_TYPE_PORTS,
 227                 .name = "ports",
 228                 .description = "VLAN port mapping",
 229                 .set = swconfig_set_vlan_ports,
 230                 .get = swconfig_get_vlan_ports,
 231         },
 232 };
 233
 234 static const struct switch_attr *
 235 swconfig_find_attr_by_name(const struct switch_attrlist *alist,
 236                                 const char *name)
 237 {
 238         int i;
 239
 240         for (i = 0; i < alist->n_attr; i++)
 241                 if (strcmp(name, alist->attr[i].name) == 0)
 242                         return &alist->attr[i];
 243
 244         return NULL;
 245 }
 246
 247 static void swconfig_defaults_init(struct switch_dev *dev)
 248 {
 249         const struct switch_dev_ops *ops = dev->ops;
 250
 251         dev->def_global = 0;
 252         dev->def_vlan = 0;
 253         dev->def_port = 0;
 254
 255         if (ops->get_vlan_ports || ops->set_vlan_ports)
 256                 set_bit(VLAN_PORTS, &dev->def_vlan);
 257
 258         if (ops->get_port_pvid || ops->set_port_pvid)
 259                 set_bit(PORT_PVID, &dev->def_port);
 260
 261         if (ops->get_port_link &&
 262             !swconfig_find_attr_by_name(&ops->attr_port, "link"))
 263                 set_bit(PORT_LINK, &dev->def_port);
 264
 265         /* always present, can be no-op */
 266         set_bit(GLOBAL_APPLY, &dev->def_global);
 267         set_bit(GLOBAL_RESET, &dev->def_global);
 268 }
 269
 270
 271 static struct genl_family switch_fam = {
 272         .id = GENL_ID_GENERATE,
 273         .name = "switch",
 274         .hdrsize = 0,
 275         .version = 1,
 276         .maxattr = SWITCH_ATTR_MAX,
 277 };
 278
 279 static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
 280         [SWITCH_ATTR_ID] = { .type = NLA_U32 },
 281         [SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
 282         [SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
 283         [SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
 284         [SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
 285         [SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
 286         [SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
 287         [SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
 288 };
 289
 290 static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
 291         [SWITCH_PORT_ID] = { .type = NLA_U32 },
 292         [SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
 293 };
 294
 295 static struct nla_policy link_policy[SWITCH_LINK_ATTR_MAX] = {
 296         [SWITCH_LINK_FLAG_DUPLEX] = { .type = NLA_FLAG },
 297         [SWITCH_LINK_FLAG_ANEG] = { .type = NLA_FLAG },
 298         [SWITCH_LINK_SPEED] = { .type = NLA_U32 },
 299 };
 300
 301 static inline void
 302 swconfig_lock(void)
 303 {
 304         spin_lock(&swdevs_lock);
 305 }
 306
 307 static inline void
 308 swconfig_unlock(void)
 309 {
 310         spin_unlock(&swdevs_lock);
 311 }
 312
 313 static struct switch_dev *
 314 swconfig_get_dev(struct genl_info *info)
 315 {
 316         struct switch_dev *dev = NULL;
 317         struct switch_dev *p;
 318         int id;
 319
 320         if (!info->attrs[SWITCH_ATTR_ID])
 321                 goto done;
 322
 323         id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
 324         swconfig_lock();
 325         list_for_each_entry(p, &swdevs, dev_list) {
 326                 if (id != p->id)
 327                         continue;
 328
 329                 dev = p;
 330                 break;
 331         }
 332         if (dev)
 333                 mutex_lock(&dev->sw_mutex);
 334         else
 335                 pr_debug("device %d not found\n", id);
 336         swconfig_unlock();
 337 done:
 338         return dev;
 339 }
 340
 341 static inline void
 342 swconfig_put_dev(struct switch_dev *dev)
 343 {
 344         mutex_unlock(&dev->sw_mutex);
 345 }
 346
 347 static int
 348 swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
 349 {
 350         struct switch_attr *op = arg;
 351         struct genl_info *info = cb->info;
 352         struct sk_buff *msg = cb->msg;
 353         int id = cb->args[0];
 354         void *hdr;
 355
 356         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 357                         NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
 358         if (IS_ERR(hdr))
 359                 return -1;
 360
 361         if (nla_put_u32(msg, SWITCH_ATTR_OP_ID, id))
 362                 goto nla_put_failure;
 363         if (nla_put_u32(msg, SWITCH_ATTR_OP_TYPE, op->type))
 364                 goto nla_put_failure;
 365         if (nla_put_string(msg, SWITCH_ATTR_OP_NAME, op->name))
 366                 goto nla_put_failure;
 367         if (op->description)
 368                 if (nla_put_string(msg, SWITCH_ATTR_OP_DESCRIPTION,
 369                         op->description))
 370                         goto nla_put_failure;
 371
 372         genlmsg_end(msg, hdr);
 373         return msg->len;
 374 nla_put_failure:
 375         genlmsg_cancel(msg, hdr);
 376         return -EMSGSIZE;
 377 }
 378
 379 /* spread multipart messages across multiple message buffers */
 380 static int
 381 swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
 382 {
 383         struct genl_info *info = cb->info;
 384         int restart = 0;
 385         int err;
 386
 387         do {
 388                 if (!cb->msg) {
 389                         cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 390                         if (cb->msg == NULL)
 391                                 goto error;
 392                 }
 393
 394                 if (!(cb->fill(cb, arg) < 0))
 395                         break;
 396
 397                 /* fill failed, check if this was already the second attempt */
 398                 if (restart)
 399                         goto error;
 400
 401                 /* try again in a new message, send the current one */
 402                 restart = 1;
 403                 if (cb->close) {
 404                         if (cb->close(cb, arg) < 0)
 405                                 goto error;
 406                 }
 407                 err = genlmsg_reply(cb->msg, info);
 408                 cb->msg = NULL;
 409                 if (err < 0)
 410                         goto error;
 411
 412         } while (restart);
 413
 414         return 0;
 415
 416 error:
 417         if (cb->msg)
 418                 nlmsg_free(cb->msg);
 419         return -1;
 420 }
 421
 422 static int
 423 swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
 424 {
 425         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 426         const struct switch_attrlist *alist;
 427         struct switch_dev *dev;
 428         struct swconfig_callback cb;
 429         int err = -EINVAL;
 430         int i;
 431
 432         /* defaults */
 433         struct switch_attr *def_list;
 434         unsigned long *def_active;
 435         int n_def;
 436
 437         dev = swconfig_get_dev(info);
 438         if (!dev)
 439                 return -EINVAL;
 440
 441         switch (hdr->cmd) {
 442         case SWITCH_CMD_LIST_GLOBAL:
 443                 alist = &dev->ops->attr_global;
 444                 def_list = default_global;
 445                 def_active = &dev->def_global;
 446                 n_def = ARRAY_SIZE(default_global);
 447                 break;
 448         case SWITCH_CMD_LIST_VLAN:
 449                 alist = &dev->ops->attr_vlan;
 450                 def_list = default_vlan;
 451                 def_active = &dev->def_vlan;
 452                 n_def = ARRAY_SIZE(default_vlan);
 453                 break;
 454         case SWITCH_CMD_LIST_PORT:
 455                 alist = &dev->ops->attr_port;
 456                 def_list = default_port;
 457                 def_active = &dev->def_port;
 458                 n_def = ARRAY_SIZE(default_port);
 459                 break;
 460         default:
 461                 WARN_ON(1);
 462                 goto out;
 463         }
 464
 465         memset(&cb, 0, sizeof(cb));
 466         cb.info = info;
 467         cb.fill = swconfig_dump_attr;
 468         for (i = 0; i < alist->n_attr; i++) {
 469                 if (alist->attr[i].disabled)
 470                         continue;
 471                 cb.args[0] = i;
 472                 err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
 473                 if (err < 0)
 474                         goto error;
 475         }
 476
 477         /* defaults */
 478         for (i = 0; i < n_def; i++) {
 479                 if (!test_bit(i, def_active))
 480                         continue;
 481                 cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
 482                 err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
 483                 if (err < 0)
 484                         goto error;
 485         }
 486         swconfig_put_dev(dev);
 487
 488         if (!cb.msg)
 489                 return 0;
 490
 491         return genlmsg_reply(cb.msg, info);
 492
 493 error:
 494         if (cb.msg)
 495                 nlmsg_free(cb.msg);
 496 out:
 497         swconfig_put_dev(dev);
 498         return err;
 499 }
 500
 501 static const struct switch_attr *
 502 swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
 503                 struct switch_val *val)
 504 {
 505         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 506         const struct switch_attrlist *alist;
 507         const struct switch_attr *attr = NULL;
 508         int attr_id;
 509
 510         /* defaults */
 511         struct switch_attr *def_list;
 512         unsigned long *def_active;
 513         int n_def;
 514
 515         if (!info->attrs[SWITCH_ATTR_OP_ID])
 516                 goto done;
 517
 518         switch (hdr->cmd) {
 519         case SWITCH_CMD_SET_GLOBAL:
 520         case SWITCH_CMD_GET_GLOBAL:
 521                 alist = &dev->ops->attr_global;
 522                 def_list = default_global;
 523                 def_active = &dev->def_global;
 524                 n_def = ARRAY_SIZE(default_global);
 525                 break;
 526         case SWITCH_CMD_SET_VLAN:
 527         case SWITCH_CMD_GET_VLAN:
 528                 alist = &dev->ops->attr_vlan;
 529                 def_list = default_vlan;
 530                 def_active = &dev->def_vlan;
 531                 n_def = ARRAY_SIZE(default_vlan);
 532                 if (!info->attrs[SWITCH_ATTR_OP_VLAN])
 533                         goto done;
 534                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
 535                 if (val->port_vlan >= dev->vlans)
 536                         goto done;
 537                 break;
 538         case SWITCH_CMD_SET_PORT:
 539         case SWITCH_CMD_GET_PORT:
 540                 alist = &dev->ops->attr_port;
 541                 def_list = default_port;
 542                 def_active = &dev->def_port;
 543                 n_def = ARRAY_SIZE(default_port);
 544                 if (!info->attrs[SWITCH_ATTR_OP_PORT])
 545                         goto done;
 546                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
 547                 if (val->port_vlan >= dev->ports)
 548                         goto done;
 549                 break;
 550         default:
 551                 WARN_ON(1);
 552                 goto done;
 553         }
 554
 555         if (!alist)
 556                 goto done;
 557
 558         attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
 559         if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
 560                 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
 561                 if (attr_id >= n_def)
 562                         goto done;
 563                 if (!test_bit(attr_id, def_active))
 564                         goto done;
 565                 attr = &def_list[attr_id];
 566         } else {
 567                 if (attr_id >= alist->n_attr)
 568                         goto done;
 569                 attr = &alist->attr[attr_id];
 570         }
 571
 572         if (attr->disabled)
 573                 attr = NULL;
 574
 575 done:
 576         if (!attr)
 577                 pr_debug("attribute lookup failed\n");
 578         val->attr = attr;
 579         return attr;
 580 }
 581
 582 static int
 583 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 584                 struct switch_val *val, int max)
 585 {
 586         struct nlattr *nla;
 587         int rem;
 588
 589         val->len = 0;
 590         nla_for_each_nested(nla, head, rem) {
 591                 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
 592                 struct switch_port *port = &val->value.ports[val->len];
 593
 594                 if (val->len >= max)
 595                         return -EINVAL;
 596
 597                 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
 598                                 port_policy))
 599                         return -EINVAL;
 600
 601                 if (!tb[SWITCH_PORT_ID])
 602                         return -EINVAL;
 603
 604                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 605                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 606                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 607                 val->len++;
 608         }
 609
 610         return 0;
 611 }
 612
 613 static int
 614 swconfig_parse_link(struct sk_buff *msg, struct nlattr *nla,
 615                     struct switch_port_link *link)
 616 {
 617         struct nlattr *tb[SWITCH_LINK_ATTR_MAX + 1];
 618
 619         if (nla_parse_nested(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy))
 620                 return -EINVAL;
 621
 622         link->duplex = !!tb[SWITCH_LINK_FLAG_DUPLEX];
 623         link->aneg = !!tb[SWITCH_LINK_FLAG_ANEG];
 624         link->speed = nla_get_u32(tb[SWITCH_LINK_SPEED]);
 625
 626         return 0;
 627 }
 628
 629 static int
 630 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 631 {
 632         const struct switch_attr *attr;
 633         struct switch_dev *dev;
 634         struct switch_val val;
 635         int err = -EINVAL;
 636
 637         dev = swconfig_get_dev(info);
 638         if (!dev)
 639                 return -EINVAL;
 640
 641         memset(&val, 0, sizeof(val));
 642         attr = swconfig_lookup_attr(dev, info, &val);
 643         if (!attr || !attr->set)
 644                 goto error;
 645
 646         val.attr = attr;
 647         switch (attr->type) {
 648         case SWITCH_TYPE_NOVAL:
 649                 break;
 650         case SWITCH_TYPE_INT:
 651                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
 652                         goto error;
 653                 val.value.i =
 654                         nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
 655                 break;
 656         case SWITCH_TYPE_STRING:
 657                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
 658                         goto error;
 659                 val.value.s =
 660                         nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
 661                 break;
 662         case SWITCH_TYPE_PORTS:
 663                 val.value.ports = dev->portbuf;
 664                 memset(dev->portbuf, 0,
 665                         sizeof(struct switch_port) * dev->ports);
 666
 667                 /* TODO: implement multipart? */
 668                 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
 669                         err = swconfig_parse_ports(skb,
 670                                 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS],
 671                                 &val, dev->ports);
 672                         if (err < 0)
 673                                 goto error;
 674                 } else {
 675                         val.len = 0;
 676                         err = 0;
 677                 }
 678                 break;
 679         case SWITCH_TYPE_LINK:
 680                 val.value.link = &dev->linkbuf;
 681                 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 682
 683                 if (info->attrs[SWITCH_ATTR_OP_VALUE_LINK]) {
 684                         err = swconfig_parse_link(skb,
 685                                                   info->attrs[SWITCH_ATTR_OP_VALUE_LINK],
 686                                                   val.value.link);
 687                         if (err < 0)
 688                                 goto error;
 689                 } else {
 690                         val.len = 0;
 691                         err = 0;
 692                 }
 693                 break;
 694         default:
 695                 goto error;
 696         }
 697
 698         err = attr->set(dev, attr, &val);
 699 error:
 700         swconfig_put_dev(dev);
 701         return err;
 702 }
 703
 704 static int
 705 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
 706 {
 707         if (cb->nest[0])
 708                 nla_nest_end(cb->msg, cb->nest[0]);
 709         return 0;
 710 }
 711
 712 static int
 713 swconfig_send_port(struct swconfig_callback *cb, void *arg)
 714 {
 715         const struct switch_port *port = arg;
 716         struct nlattr *p = NULL;
 717
 718         if (!cb->nest[0]) {
 719                 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
 720                 if (!cb->nest[0])
 721                         return -1;
 722         }
 723
 724         p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
 725         if (!p)
 726                 goto error;
 727
 728         if (nla_put_u32(cb->msg, SWITCH_PORT_ID, port->id))
 729                 goto nla_put_failure;
 730         if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
 731                 if (nla_put_flag(cb->msg, SWITCH_PORT_FLAG_TAGGED))
 732                         goto nla_put_failure;
 733         }
 734
 735         nla_nest_end(cb->msg, p);
 736         return 0;
 737
 738 nla_put_failure:
 739                 nla_nest_cancel(cb->msg, p);
 740 error:
 741         nla_nest_cancel(cb->msg, cb->nest[0]);
 742         return -1;
 743 }
 744
 745 static int
 746 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
 747                 const struct switch_val *val)
 748 {
 749         struct swconfig_callback cb;
 750         int err = 0;
 751         int i;
 752
 753         if (!val->value.ports)
 754                 return -EINVAL;
 755
 756         memset(&cb, 0, sizeof(cb));
 757         cb.cmd = attr;
 758         cb.msg = *msg;
 759         cb.info = info;
 760         cb.fill = swconfig_send_port;
 761         cb.close = swconfig_close_portlist;
 762
 763         cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
 764         for (i = 0; i < val->len; i++) {
 765                 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
 766                 if (err)
 767                         goto done;
 768         }
 769         err = val->len;
 770         swconfig_close_portlist(&cb, NULL);
 771         *msg = cb.msg;
 772
 773 done:
 774         return err;
 775 }
 776
 777 static int
 778 swconfig_send_link(struct sk_buff *msg, struct genl_info *info, int attr,
 779                    const struct switch_port_link *link)
 780 {
 781         struct nlattr *p = NULL;
 782         int err = 0;
 783
 784         p = nla_nest_start(msg, attr);
 785         if (link->link) {
 786                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_LINK))
 787                         goto nla_put_failure;
 788         }
 789         if (link->duplex) {
 790                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_DUPLEX))
 791                         goto nla_put_failure;
 792         }
 793         if (link->aneg) {
 794                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_ANEG))
 795                         goto nla_put_failure;
 796         }
 797         if (link->tx_flow) {
 798                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_TX_FLOW))
 799                         goto nla_put_failure;
 800         }
 801         if (link->rx_flow) {
 802                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_RX_FLOW))
 803                         goto nla_put_failure;
 804         }
 805         if (nla_put_u32(msg, SWITCH_LINK_SPEED, link->speed))
 806                 goto nla_put_failure;
 807         if (link->eee & ADVERTISED_100baseT_Full) {
 808                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_100BASET))
 809                         goto nla_put_failure;
 810         }
 811         if (link->eee & ADVERTISED_1000baseT_Full) {
 812                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_1000BASET))
 813                         goto nla_put_failure;
 814         }
 815         nla_nest_end(msg, p);
 816
 817         return err;
 818
 819 nla_put_failure:
 820         nla_nest_cancel(msg, p);
 821         return -1;
 822 }
 823
 824 static int
 825 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 826 {
 827         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 828         const struct switch_attr *attr;
 829         struct switch_dev *dev;
 830         struct sk_buff *msg = NULL;
 831         struct switch_val val;
 832         int err = -EINVAL;
 833         int cmd = hdr->cmd;
 834
 835         dev = swconfig_get_dev(info);
 836         if (!dev)
 837                 return -EINVAL;
 838
 839         memset(&val, 0, sizeof(val));
 840         attr = swconfig_lookup_attr(dev, info, &val);
 841         if (!attr || !attr->get)
 842                 goto error;
 843
 844         if (attr->type == SWITCH_TYPE_PORTS) {
 845                 val.value.ports = dev->portbuf;
 846                 memset(dev->portbuf, 0,
 847                         sizeof(struct switch_port) * dev->ports);
 848         } else if (attr->type == SWITCH_TYPE_LINK) {
 849                 val.value.link = &dev->linkbuf;
 850                 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 851         }
 852
 853         err = attr->get(dev, attr, &val);
 854         if (err)
 855                 goto error;
 856
 857         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 858         if (!msg)
 859                 goto error;
 860
 861         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 862                         0, cmd);
 863         if (IS_ERR(hdr))
 864                 goto nla_put_failure;
 865
 866         switch (attr->type) {
 867         case SWITCH_TYPE_INT:
 868                 if (nla_put_u32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i))
 869                         goto nla_put_failure;
 870                 break;
 871         case SWITCH_TYPE_STRING:
 872                 if (nla_put_string(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s))
 873                         goto nla_put_failure;
 874                 break;
 875         case SWITCH_TYPE_PORTS:
 876                 err = swconfig_send_ports(&msg, info,
 877                                 SWITCH_ATTR_OP_VALUE_PORTS, &val);
 878                 if (err < 0)
 879                         goto nla_put_failure;
 880                 break;
 881         case SWITCH_TYPE_LINK:
 882                 err = swconfig_send_link(msg, info,
 883                                          SWITCH_ATTR_OP_VALUE_LINK, val.value.link);
 884                 if (err < 0)
 885                         goto nla_put_failure;
 886                 break;
 887         default:
 888                 pr_debug("invalid type in attribute\n");
 889                 err = -EINVAL;
 890                 goto error;
 891         }
 892         genlmsg_end(msg, hdr);
 893         err = msg->len;
 894         if (err < 0)
 895                 goto nla_put_failure;
 896
 897         swconfig_put_dev(dev);
 898         return genlmsg_reply(msg, info);
 899
 900 nla_put_failure:
 901         if (msg)
 902                 nlmsg_free(msg);
 903 error:
 904         swconfig_put_dev(dev);
 905         if (!err)
 906                 err = -ENOMEM;
 907         return err;
 908 }
 909
 910 static int
 911 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 912                 const struct switch_dev *dev)
 913 {
 914         struct nlattr *p = NULL, *m = NULL;
 915         void *hdr;
 916         int i;
 917
 918         hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
 919                         SWITCH_CMD_NEW_ATTR);
 920         if (IS_ERR(hdr))
 921                 return -1;
 922
 923         if (nla_put_u32(msg, SWITCH_ATTR_ID, dev->id))
 924                 goto nla_put_failure;
 925         if (nla_put_string(msg, SWITCH_ATTR_DEV_NAME, dev->devname))
 926                 goto nla_put_failure;
 927         if (nla_put_string(msg, SWITCH_ATTR_ALIAS, dev->alias))
 928                 goto nla_put_failure;
 929         if (nla_put_string(msg, SWITCH_ATTR_NAME, dev->name))
 930                 goto nla_put_failure;
 931         if (nla_put_u32(msg, SWITCH_ATTR_VLANS, dev->vlans))
 932                 goto nla_put_failure;
 933         if (nla_put_u32(msg, SWITCH_ATTR_PORTS, dev->ports))
 934                 goto nla_put_failure;
 935         if (nla_put_u32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port))
 936                 goto nla_put_failure;
 937
 938         m = nla_nest_start(msg, SWITCH_ATTR_PORTMAP);
 939         if (!m)
 940                 goto nla_put_failure;
 941         for (i = 0; i < dev->ports; i++) {
 942                 p = nla_nest_start(msg, SWITCH_ATTR_PORTS);
 943                 if (!p)
 944                         continue;
 945                 if (dev->portmap[i].s) {
 946                         if (nla_put_string(msg, SWITCH_PORTMAP_SEGMENT,
 947                                                 dev->portmap[i].s))
 948                                 goto nla_put_failure;
 949                         if (nla_put_u32(msg, SWITCH_PORTMAP_VIRT,
 950                                                 dev->portmap[i].virt))
 951                                 goto nla_put_failure;
 952                 }
 953                 nla_nest_end(msg, p);
 954         }
 955         nla_nest_end(msg, m);
 956         genlmsg_end(msg, hdr);
 957         return msg->len;
 958 nla_put_failure:
 959         genlmsg_cancel(msg, hdr);
 960         return -EMSGSIZE;
 961 }
 962
 963 static int swconfig_dump_switches(struct sk_buff *skb,
 964                 struct netlink_callback *cb)
 965 {
 966         struct switch_dev *dev;
 967         int start = cb->args[0];
 968         int idx = 0;
 969
 970         swconfig_lock();
 971         list_for_each_entry(dev, &swdevs, dev_list) {
 972                 if (++idx <= start)
 973                         continue;
 974                 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).portid,
 975                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 976                                 dev) < 0)
 977                         break;
 978         }
 979         swconfig_unlock();
 980         cb->args[0] = idx;
 981
 982         return skb->len;
 983 }
 984
 985 static int
 986 swconfig_done(struct netlink_callback *cb)
 987 {
 988         return 0;
 989 }
 990
 991 static struct genl_ops swconfig_ops[] = {
 992         {
 993                 .cmd = SWITCH_CMD_LIST_GLOBAL,
 994                 .doit = swconfig_list_attrs,
 995                 .policy = switch_policy,
 996         },
 997         {
 998                 .cmd = SWITCH_CMD_LIST_VLAN,
 999                 .doit = swconfig_list_attrs,
1000                 .policy = switch_policy,
1001         },
1002         {
1003                 .cmd = SWITCH_CMD_LIST_PORT,
1004                 .doit = swconfig_list_attrs,
1005                 .policy = switch_policy,
1006         },
1007         {
1008                 .cmd = SWITCH_CMD_GET_GLOBAL,
1009                 .doit = swconfig_get_attr,
1010                 .policy = switch_policy,
1011         },
1012         {
1013                 .cmd = SWITCH_CMD_GET_VLAN,
1014                 .doit = swconfig_get_attr,
1015                 .policy = switch_policy,
1016         },
1017         {
1018                 .cmd = SWITCH_CMD_GET_PORT,
1019                 .doit = swconfig_get_attr,
1020                 .policy = switch_policy,
1021         },
1022         {
1023                 .cmd = SWITCH_CMD_SET_GLOBAL,
1024                 .doit = swconfig_set_attr,
1025                 .policy = switch_policy,
1026         },
1027         {
1028                 .cmd = SWITCH_CMD_SET_VLAN,
1029                 .doit = swconfig_set_attr,
1030                 .policy = switch_policy,
1031         },
1032         {
1033                 .cmd = SWITCH_CMD_SET_PORT,
1034                 .doit = swconfig_set_attr,
1035                 .policy = switch_policy,
1036         },
1037         {
1038                 .cmd = SWITCH_CMD_GET_SWITCH,
1039                 .dumpit = swconfig_dump_switches,
1040                 .policy = switch_policy,
1041                 .done = swconfig_done,
1042         }
1043 };
1044
1045 #ifdef CONFIG_OF
1046 void
1047 of_switch_load_portmap(struct switch_dev *dev)
1048 {
1049         struct device_node *port;
1050
1051         if (!dev->of_node)
1052                 return;
1053
1054         for_each_child_of_node(dev->of_node, port) {
1055                 const __be32 *prop;
1056                 const char *segment;
1057                 int size, phys;
1058
1059                 if (!of_device_is_compatible(port, "swconfig,port"))
1060                         continue;
1061
1062                 if (of_property_read_string(port, "swconfig,segment", &segment))
1063                         continue;
1064
1065                 prop = of_get_property(port, "swconfig,portmap", &size);
1066                 if (!prop)
1067                         continue;
1068
1069                 if (size != (2 * sizeof(*prop))) {
1070                         pr_err("%s: failed to parse port mapping\n",
1071                                         port->name);
1072                         continue;
1073                 }
1074
1075                 phys = be32_to_cpup(prop++);
1076                 if ((phys < 0) | (phys >= dev->ports)) {
1077                         pr_err("%s: physical port index out of range\n",
1078                                         port->name);
1079                         continue;
1080                 }
1081
1082                 dev->portmap[phys].s = kstrdup(segment, GFP_KERNEL);
1083                 dev->portmap[phys].virt = be32_to_cpup(prop);
1084                 pr_debug("Found port: %s, physical: %d, virtual: %d\n",
1085                         segment, phys, dev->portmap[phys].virt);
1086         }
1087 }
1088 #endif
1089
1090 int
1091 register_switch(struct switch_dev *dev, struct net_device *netdev)
1092 {
1093         struct switch_dev *sdev;
1094         const int max_switches = 8 * sizeof(unsigned long);
1095         unsigned long in_use = 0;
1096         int err;
1097         int i;
1098
1099         INIT_LIST_HEAD(&dev->dev_list);
1100         if (netdev) {
1101                 dev->netdev = netdev;
1102                 if (!dev->alias)
1103                         dev->alias = netdev->name;
1104         }
1105         BUG_ON(!dev->alias);
1106
1107         if (dev->ports > 0) {
1108                 dev->portbuf = kzalloc(sizeof(struct switch_port) *
1109                                 dev->ports, GFP_KERNEL);
1110                 if (!dev->portbuf)
1111                         return -ENOMEM;
1112                 dev->portmap = kzalloc(sizeof(struct switch_portmap) *
1113                                 dev->ports, GFP_KERNEL);
1114                 if (!dev->portmap) {
1115                         kfree(dev->portbuf);
1116                         return -ENOMEM;
1117                 }
1118         }
1119         swconfig_defaults_init(dev);
1120         mutex_init(&dev->sw_mutex);
1121         swconfig_lock();
1122         dev->id = ++swdev_id;
1123
1124         list_for_each_entry(sdev, &swdevs, dev_list) {
1125                 if (!sscanf(sdev->devname, SWCONFIG_DEVNAME, &i))
1126                         continue;
1127                 if (i < 0 || i > max_switches)
1128                         continue;
1129
1130                 set_bit(i, &in_use);
1131         }
1132         i = find_first_zero_bit(&in_use, max_switches);
1133
1134         if (i == max_switches) {
1135                 swconfig_unlock();
1136                 return -ENFILE;
1137         }
1138
1139 #ifdef CONFIG_OF
1140         if (dev->ports)
1141                 of_switch_load_portmap(dev);
1142 #endif
1143
1144         /* fill device name */
1145         snprintf(dev->devname, IFNAMSIZ, SWCONFIG_DEVNAME, i);
1146
1147         list_add_tail(&dev->dev_list, &swdevs);
1148         swconfig_unlock();
1149
1150         err = swconfig_create_led_trigger(dev);
1151         if (err)
1152                 return err;
1153
1154         return 0;
1155 }
1156 EXPORT_SYMBOL_GPL(register_switch);
1157
1158 void
1159 unregister_switch(struct switch_dev *dev)
1160 {
1161         swconfig_destroy_led_trigger(dev);
1162         kfree(dev->portbuf);
1163         mutex_lock(&dev->sw_mutex);
1164         swconfig_lock();
1165         list_del(&dev->dev_list);
1166         swconfig_unlock();
1167         mutex_unlock(&dev->sw_mutex);
1168 }
1169 EXPORT_SYMBOL_GPL(unregister_switch);
1170
1171
1172 static int __init
1173 swconfig_init(void)
1174 {
1175         int err;
1176 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0))
1177         int i;
1178 #endif
1179
1180         INIT_LIST_HEAD(&swdevs);
1181
1182 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0))
1183         err = genl_register_family(&switch_fam);
1184         if (err)
1185                 return err;
1186
1187         for (i = 0; i < ARRAY_SIZE(swconfig_ops); i++) {
1188                 err = genl_register_ops(&switch_fam, &swconfig_ops[i]);
1189                 if (err)
1190                         goto unregister;
1191         }
1192         return 0;
1193
1194 unregister:
1195         genl_unregister_family(&switch_fam);
1196         return err;
1197 #else
1198         err = genl_register_family_with_ops(&switch_fam, swconfig_ops);
1199         if (err)
1200                 return err;
1201         return 0;
1202 #endif
1203 }
1204
1205 static void __exit
1206 swconfig_exit(void)
1207 {
1208         genl_unregister_family(&switch_fam);
1209 }
1210
1211 module_init(swconfig_init);
1212 module_exit(swconfig_exit);
1213