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_MUTEX(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
 274 static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
 275         [SWITCH_ATTR_ID] = { .type = NLA_U32 },
 276         [SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
 277         [SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
 278         [SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
 279         [SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
 280         [SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
 281         [SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
 282         [SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
 283 };
 284
 285 static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
 286         [SWITCH_PORT_ID] = { .type = NLA_U32 },
 287         [SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
 288 };
 289
 290 static struct nla_policy link_policy[SWITCH_LINK_ATTR_MAX] = {
 291         [SWITCH_LINK_FLAG_DUPLEX] = { .type = NLA_FLAG },
 292         [SWITCH_LINK_FLAG_ANEG] = { .type = NLA_FLAG },
 293         [SWITCH_LINK_SPEED] = { .type = NLA_U32 },
 294 };
 295
 296 static inline void
 297 swconfig_lock(void)
 298 {
 299         mutex_lock(&swdevs_lock);
 300 }
 301
 302 static inline void
 303 swconfig_unlock(void)
 304 {
 305         mutex_unlock(&swdevs_lock);
 306 }
 307
 308 static struct switch_dev *
 309 swconfig_get_dev(struct genl_info *info)
 310 {
 311         struct switch_dev *dev = NULL;
 312         struct switch_dev *p;
 313         int id;
 314
 315         if (!info->attrs[SWITCH_ATTR_ID])
 316                 goto done;
 317
 318         id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
 319         swconfig_lock();
 320         list_for_each_entry(p, &swdevs, dev_list) {
 321                 if (id != p->id)
 322                         continue;
 323
 324                 dev = p;
 325                 break;
 326         }
 327         if (dev)
 328                 mutex_lock(&dev->sw_mutex);
 329         else
 330                 pr_debug("device %d not found\n", id);
 331         swconfig_unlock();
 332 done:
 333         return dev;
 334 }
 335
 336 static inline void
 337 swconfig_put_dev(struct switch_dev *dev)
 338 {
 339         mutex_unlock(&dev->sw_mutex);
 340 }
 341
 342 static int
 343 swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
 344 {
 345         struct switch_attr *op = arg;
 346         struct genl_info *info = cb->info;
 347         struct sk_buff *msg = cb->msg;
 348         int id = cb->args[0];
 349         void *hdr;
 350
 351         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 352                         NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
 353         if (IS_ERR(hdr))
 354                 return -1;
 355
 356         if (nla_put_u32(msg, SWITCH_ATTR_OP_ID, id))
 357                 goto nla_put_failure;
 358         if (nla_put_u32(msg, SWITCH_ATTR_OP_TYPE, op->type))
 359                 goto nla_put_failure;
 360         if (nla_put_string(msg, SWITCH_ATTR_OP_NAME, op->name))
 361                 goto nla_put_failure;
 362         if (op->description)
 363                 if (nla_put_string(msg, SWITCH_ATTR_OP_DESCRIPTION,
 364                         op->description))
 365                         goto nla_put_failure;
 366
 367         genlmsg_end(msg, hdr);
 368         return msg->len;
 369 nla_put_failure:
 370         genlmsg_cancel(msg, hdr);
 371         return -EMSGSIZE;
 372 }
 373
 374 /* spread multipart messages across multiple message buffers */
 375 static int
 376 swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
 377 {
 378         struct genl_info *info = cb->info;
 379         int restart = 0;
 380         int err;
 381
 382         do {
 383                 if (!cb->msg) {
 384                         cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 385                         if (cb->msg == NULL)
 386                                 goto error;
 387                 }
 388
 389                 if (!(cb->fill(cb, arg) < 0))
 390                         break;
 391
 392                 /* fill failed, check if this was already the second attempt */
 393                 if (restart)
 394                         goto error;
 395
 396                 /* try again in a new message, send the current one */
 397                 restart = 1;
 398                 if (cb->close) {
 399                         if (cb->close(cb, arg) < 0)
 400                                 goto error;
 401                 }
 402                 err = genlmsg_reply(cb->msg, info);
 403                 cb->msg = NULL;
 404                 if (err < 0)
 405                         goto error;
 406
 407         } while (restart);
 408
 409         return 0;
 410
 411 error:
 412         if (cb->msg)
 413                 nlmsg_free(cb->msg);
 414         return -1;
 415 }
 416
 417 static int
 418 swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
 419 {
 420         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 421         const struct switch_attrlist *alist;
 422         struct switch_dev *dev;
 423         struct swconfig_callback cb;
 424         int err = -EINVAL;
 425         int i;
 426
 427         /* defaults */
 428         struct switch_attr *def_list;
 429         unsigned long *def_active;
 430         int n_def;
 431
 432         dev = swconfig_get_dev(info);
 433         if (!dev)
 434                 return -EINVAL;
 435
 436         switch (hdr->cmd) {
 437         case SWITCH_CMD_LIST_GLOBAL:
 438                 alist = &dev->ops->attr_global;
 439                 def_list = default_global;
 440                 def_active = &dev->def_global;
 441                 n_def = ARRAY_SIZE(default_global);
 442                 break;
 443         case SWITCH_CMD_LIST_VLAN:
 444                 alist = &dev->ops->attr_vlan;
 445                 def_list = default_vlan;
 446                 def_active = &dev->def_vlan;
 447                 n_def = ARRAY_SIZE(default_vlan);
 448                 break;
 449         case SWITCH_CMD_LIST_PORT:
 450                 alist = &dev->ops->attr_port;
 451                 def_list = default_port;
 452                 def_active = &dev->def_port;
 453                 n_def = ARRAY_SIZE(default_port);
 454                 break;
 455         default:
 456                 WARN_ON(1);
 457                 goto out;
 458         }
 459
 460         memset(&cb, 0, sizeof(cb));
 461         cb.info = info;
 462         cb.fill = swconfig_dump_attr;
 463         for (i = 0; i < alist->n_attr; i++) {
 464                 if (alist->attr[i].disabled)
 465                         continue;
 466                 cb.args[0] = i;
 467                 err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
 468                 if (err < 0)
 469                         goto error;
 470         }
 471
 472         /* defaults */
 473         for (i = 0; i < n_def; i++) {
 474                 if (!test_bit(i, def_active))
 475                         continue;
 476                 cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
 477                 err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
 478                 if (err < 0)
 479                         goto error;
 480         }
 481         swconfig_put_dev(dev);
 482
 483         if (!cb.msg)
 484                 return 0;
 485
 486         return genlmsg_reply(cb.msg, info);
 487
 488 error:
 489         if (cb.msg)
 490                 nlmsg_free(cb.msg);
 491 out:
 492         swconfig_put_dev(dev);
 493         return err;
 494 }
 495
 496 static const struct switch_attr *
 497 swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
 498                 struct switch_val *val)
 499 {
 500         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 501         const struct switch_attrlist *alist;
 502         const struct switch_attr *attr = NULL;
 503         unsigned int attr_id;
 504
 505         /* defaults */
 506         struct switch_attr *def_list;
 507         unsigned long *def_active;
 508         int n_def;
 509
 510         if (!info->attrs[SWITCH_ATTR_OP_ID])
 511                 goto done;
 512
 513         switch (hdr->cmd) {
 514         case SWITCH_CMD_SET_GLOBAL:
 515         case SWITCH_CMD_GET_GLOBAL:
 516                 alist = &dev->ops->attr_global;
 517                 def_list = default_global;
 518                 def_active = &dev->def_global;
 519                 n_def = ARRAY_SIZE(default_global);
 520                 break;
 521         case SWITCH_CMD_SET_VLAN:
 522         case SWITCH_CMD_GET_VLAN:
 523                 alist = &dev->ops->attr_vlan;
 524                 def_list = default_vlan;
 525                 def_active = &dev->def_vlan;
 526                 n_def = ARRAY_SIZE(default_vlan);
 527                 if (!info->attrs[SWITCH_ATTR_OP_VLAN])
 528                         goto done;
 529                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
 530                 if (val->port_vlan >= dev->vlans)
 531                         goto done;
 532                 break;
 533         case SWITCH_CMD_SET_PORT:
 534         case SWITCH_CMD_GET_PORT:
 535                 alist = &dev->ops->attr_port;
 536                 def_list = default_port;
 537                 def_active = &dev->def_port;
 538                 n_def = ARRAY_SIZE(default_port);
 539                 if (!info->attrs[SWITCH_ATTR_OP_PORT])
 540                         goto done;
 541                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
 542                 if (val->port_vlan >= dev->ports)
 543                         goto done;
 544                 break;
 545         default:
 546                 WARN_ON(1);
 547                 goto done;
 548         }
 549
 550         if (!alist)
 551                 goto done;
 552
 553         attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
 554         if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
 555                 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
 556                 if (attr_id >= n_def)
 557                         goto done;
 558                 if (!test_bit(attr_id, def_active))
 559                         goto done;
 560                 attr = &def_list[attr_id];
 561         } else {
 562                 if (attr_id >= alist->n_attr)
 563                         goto done;
 564                 attr = &alist->attr[attr_id];
 565         }
 566
 567         if (attr->disabled)
 568                 attr = NULL;
 569
 570 done:
 571         if (!attr)
 572                 pr_debug("attribute lookup failed\n");
 573         val->attr = attr;
 574         return attr;
 575 }
 576
 577 static int
 578 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 579                 struct switch_val *val, int max)
 580 {
 581         struct nlattr *nla;
 582         int rem;
 583
 584         val->len = 0;
 585         nla_for_each_nested(nla, head, rem) {
 586                 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
 587                 struct switch_port *port;
 588
 589                 if (val->len >= max)
 590                         return -EINVAL;
 591
 592                 port = &val->value.ports[val->len];
 593
 594                 if (nla_parse_nested_deprecated(tb, SWITCH_PORT_ATTR_MAX, nla,
 595                                 port_policy, NULL))
 596                         return -EINVAL;
 597
 598                 if (!tb[SWITCH_PORT_ID])
 599                         return -EINVAL;
 600
 601                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 602                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 603                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 604                 val->len++;
 605         }
 606
 607         return 0;
 608 }
 609
 610 static int
 611 swconfig_parse_link(struct sk_buff *msg, struct nlattr *nla,
 612                     struct switch_port_link *link)
 613 {
 614         struct nlattr *tb[SWITCH_LINK_ATTR_MAX + 1];
 615
 616         if (nla_parse_nested_deprecated(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy, NULL))
 617                 return -EINVAL;
 618
 619         link->duplex = !!tb[SWITCH_LINK_FLAG_DUPLEX];
 620         link->aneg = !!tb[SWITCH_LINK_FLAG_ANEG];
 621         link->speed = nla_get_u32(tb[SWITCH_LINK_SPEED]);
 622
 623         return 0;
 624 }
 625
 626 static int
 627 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 628 {
 629         const struct switch_attr *attr;
 630         struct switch_dev *dev;
 631         struct switch_val val;
 632         int err = -EINVAL;
 633
 634         if (!capable(CAP_NET_ADMIN))
 635                 return -EPERM;
 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 nla_put_failure;
 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                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 995                 .doit = swconfig_list_attrs,
 996         },
 997         {
 998                 .cmd = SWITCH_CMD_LIST_VLAN,
 999                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1000                 .doit = swconfig_list_attrs,
1001         },
1002         {
1003                 .cmd = SWITCH_CMD_LIST_PORT,
1004                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1005                 .doit = swconfig_list_attrs,
1006         },
1007         {
1008                 .cmd = SWITCH_CMD_GET_GLOBAL,
1009                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1010                 .doit = swconfig_get_attr,
1011         },
1012         {
1013                 .cmd = SWITCH_CMD_GET_VLAN,
1014                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1015                 .doit = swconfig_get_attr,
1016         },
1017         {
1018                 .cmd = SWITCH_CMD_GET_PORT,
1019                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1020                 .doit = swconfig_get_attr,
1021         },
1022         {
1023                 .cmd = SWITCH_CMD_SET_GLOBAL,
1024                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1025                 .flags = GENL_ADMIN_PERM,
1026                 .doit = swconfig_set_attr,
1027         },
1028         {
1029                 .cmd = SWITCH_CMD_SET_VLAN,
1030                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1031                 .flags = GENL_ADMIN_PERM,
1032                 .doit = swconfig_set_attr,
1033         },
1034         {
1035                 .cmd = SWITCH_CMD_SET_PORT,
1036                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1037                 .flags = GENL_ADMIN_PERM,
1038                 .doit = swconfig_set_attr,
1039         },
1040         {
1041                 .cmd = SWITCH_CMD_GET_SWITCH,
1042                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1043                 .dumpit = swconfig_dump_switches,
1044                 .done = swconfig_done,
1045         }
1046 };
1047
1048 static struct genl_family switch_fam = {
1049         .name = "switch",
1050         .hdrsize = 0,
1051         .version = 1,
1052         .maxattr = SWITCH_ATTR_MAX,
1053         .policy = switch_policy,
1054         .module = THIS_MODULE,
1055         .ops = swconfig_ops,
1056         .n_ops = ARRAY_SIZE(swconfig_ops),
1057 };
1058
1059 #ifdef CONFIG_OF
1060 void
1061 of_switch_load_portmap(struct switch_dev *dev)
1062 {
1063         struct device_node *port;
1064
1065         if (!dev->of_node)
1066                 return;
1067
1068         for_each_child_of_node(dev->of_node, port) {
1069                 const __be32 *prop;
1070                 const char *segment;
1071                 int size, phys;
1072
1073                 if (!of_device_is_compatible(port, "swconfig,port"))
1074                         continue;
1075
1076                 if (of_property_read_string(port, "swconfig,segment", &segment))
1077                         continue;
1078
1079                 prop = of_get_property(port, "swconfig,portmap", &size);
1080                 if (!prop)
1081                         continue;
1082
1083                 if (size != (2 * sizeof(*prop))) {
1084                         pr_err("%s: failed to parse port mapping\n",
1085                                         port->name);
1086                         continue;
1087                 }
1088
1089                 phys = be32_to_cpup(prop++);
1090                 if ((phys < 0) | (phys >= dev->ports)) {
1091                         pr_err("%s: physical port index out of range\n",
1092                                         port->name);
1093                         continue;
1094                 }
1095
1096                 dev->portmap[phys].s = kstrdup(segment, GFP_KERNEL);
1097                 dev->portmap[phys].virt = be32_to_cpup(prop);
1098                 pr_debug("Found port: %s, physical: %d, virtual: %d\n",
1099                         segment, phys, dev->portmap[phys].virt);
1100         }
1101 }
1102 #endif
1103
1104 int
1105 register_switch(struct switch_dev *dev, struct net_device *netdev)
1106 {
1107         struct switch_dev *sdev;
1108         const int max_switches = 8 * sizeof(unsigned long);
1109         unsigned long in_use = 0;
1110         int err;
1111         int i;
1112
1113         INIT_LIST_HEAD(&dev->dev_list);
1114         if (netdev) {
1115                 dev->netdev = netdev;
1116                 if (!dev->alias)
1117                         dev->alias = netdev->name;
1118         }
1119         BUG_ON(!dev->alias);
1120
1121         /* Make sure swdev_id doesn't overflow */
1122         if (swdev_id == INT_MAX) {
1123                 return -ENOMEM;
1124         }
1125
1126         if (dev->ports > 0) {
1127                 dev->portbuf = kzalloc(sizeof(struct switch_port) *
1128                                 dev->ports, GFP_KERNEL);
1129                 if (!dev->portbuf)
1130                         return -ENOMEM;
1131                 dev->portmap = kzalloc(sizeof(struct switch_portmap) *
1132                                 dev->ports, GFP_KERNEL);
1133                 if (!dev->portmap) {
1134                         kfree(dev->portbuf);
1135                         return -ENOMEM;
1136                 }
1137         }
1138         swconfig_defaults_init(dev);
1139         mutex_init(&dev->sw_mutex);
1140         swconfig_lock();
1141         dev->id = ++swdev_id;
1142
1143         list_for_each_entry(sdev, &swdevs, dev_list) {
1144                 if (!sscanf(sdev->devname, SWCONFIG_DEVNAME, &i))
1145                         continue;
1146                 if (i < 0 || i > max_switches)
1147                         continue;
1148
1149                 set_bit(i, &in_use);
1150         }
1151         i = find_first_zero_bit(&in_use, max_switches);
1152
1153         if (i == max_switches) {
1154                 swconfig_unlock();
1155                 return -ENFILE;
1156         }
1157
1158 #ifdef CONFIG_OF
1159         if (dev->ports)
1160                 of_switch_load_portmap(dev);
1161 #endif
1162
1163         /* fill device name */
1164         snprintf(dev->devname, IFNAMSIZ, SWCONFIG_DEVNAME, i);
1165
1166         list_add_tail(&dev->dev_list, &swdevs);
1167         swconfig_unlock();
1168
1169         err = swconfig_create_led_trigger(dev);
1170         if (err)
1171                 return err;
1172
1173         return 0;
1174 }
1175 EXPORT_SYMBOL_GPL(register_switch);
1176
1177 void
1178 unregister_switch(struct switch_dev *dev)
1179 {
1180         swconfig_destroy_led_trigger(dev);
1181         kfree(dev->portbuf);
1182         mutex_lock(&dev->sw_mutex);
1183         swconfig_lock();
1184         list_del(&dev->dev_list);
1185         swconfig_unlock();
1186         mutex_unlock(&dev->sw_mutex);
1187 }
1188 EXPORT_SYMBOL_GPL(unregister_switch);
1189
1190 int
1191 switch_generic_set_link(struct switch_dev *dev, int port,
1192                         struct switch_port_link *link)
1193 {
1194         if (WARN_ON(!dev->ops->phy_write16))
1195                 return -ENOTSUPP;
1196
1197         /* Generic implementation */
1198         if (link->aneg) {
1199                 dev->ops->phy_write16(dev, port, MII_BMCR, 0x0000);
1200                 dev->ops->phy_write16(dev, port, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
1201         } else {
1202                 u16 bmcr = 0;
1203
1204                 if (link->duplex)
1205                         bmcr |= BMCR_FULLDPLX;
1206
1207                 switch (link->speed) {
1208                 case SWITCH_PORT_SPEED_10:
1209                         break;
1210                 case SWITCH_PORT_SPEED_100:
1211                         bmcr |= BMCR_SPEED100;
1212                         break;
1213                 case SWITCH_PORT_SPEED_1000:
1214                         bmcr |= BMCR_SPEED1000;
1215                         break;
1216                 default:
1217                         return -ENOTSUPP;
1218                 }
1219
1220                 dev->ops->phy_write16(dev, port, MII_BMCR, bmcr);
1221         }
1222
1223         return 0;
1224 }
1225 EXPORT_SYMBOL_GPL(switch_generic_set_link);
1226
1227 static int __init
1228 swconfig_init(void)
1229 {
1230         INIT_LIST_HEAD(&swdevs);
1231
1232         return genl_register_family(&switch_fam);
1233 }
1234
1235 static void __exit
1236 swconfig_exit(void)
1237 {
1238         genl_unregister_family(&switch_fam);
1239 }
1240
1241 module_init(swconfig_init);
1242 module_exit(swconfig_exit);