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