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 const char *
 131 swconfig_speed_str(enum switch_port_speed speed)
 132 {
 133         switch (speed) {
 134         case SWITCH_PORT_SPEED_10:
 135                 return "10baseT";
 136         case SWITCH_PORT_SPEED_100:
 137                 return "100baseT";
 138         case SWITCH_PORT_SPEED_1000:
 139                 return "1000baseT";
 140         default:
 141                 break;
 142         }
 143
 144         return "unknown";
 145 }
 146
 147 static int
 148 swconfig_get_link(struct switch_dev *dev, const struct switch_attr *attr,
 149                         struct switch_val *val)
 150 {
 151         struct switch_port_link link;
 152         int len;
 153         int ret;
 154
 155         if (val->port_vlan >= dev->ports)
 156                 return -EINVAL;
 157
 158         if (!dev->ops->get_port_link)
 159                 return -EOPNOTSUPP;
 160
 161         memset(&link, 0, sizeof(link));
 162         ret = dev->ops->get_port_link(dev, val->port_vlan, &link);
 163         if (ret)
 164                 return ret;
 165
 166         memset(dev->buf, 0, sizeof(dev->buf));
 167
 168         if (link.link)
 169                 len = snprintf(dev->buf, sizeof(dev->buf),
 170                                "port:%d link:up speed:%s %s-duplex %s%s%s%s%s",
 171                                val->port_vlan,
 172                                swconfig_speed_str(link.speed),
 173                                link.duplex ? "full" : "half",
 174                                link.tx_flow ? "txflow " : "",
 175                                link.rx_flow ?   "rxflow " : "",
 176                                link.eee & ADVERTISED_100baseT_Full ? "eee100 " : "",
 177                                link.eee & ADVERTISED_1000baseT_Full ? "eee1000 " : "",
 178                                link.aneg ? "auto" : "");
 179         else
 180                 len = snprintf(dev->buf, sizeof(dev->buf), "port:%d link:down",
 181                                val->port_vlan);
 182
 183         val->value.s = dev->buf;
 184         val->len = len;
 185
 186         return 0;
 187 }
 188
 189 static int
 190 swconfig_apply_config(struct switch_dev *dev, const struct switch_attr *attr,
 191                         struct switch_val *val)
 192 {
 193         /* don't complain if not supported by the switch driver */
 194         if (!dev->ops->apply_config)
 195                 return 0;
 196
 197         return dev->ops->apply_config(dev);
 198 }
 199
 200 static int
 201 swconfig_reset_switch(struct switch_dev *dev, const struct switch_attr *attr,
 202                         struct switch_val *val)
 203 {
 204         /* don't complain if not supported by the switch driver */
 205         if (!dev->ops->reset_switch)
 206                 return 0;
 207
 208         return dev->ops->reset_switch(dev);
 209 }
 210
 211 enum global_defaults {
 212         GLOBAL_APPLY,
 213         GLOBAL_RESET,
 214 };
 215
 216 enum vlan_defaults {
 217         VLAN_PORTS,
 218 };
 219
 220 enum port_defaults {
 221         PORT_PVID,
 222         PORT_LINK,
 223 };
 224
 225 static struct switch_attr default_global[] = {
 226         [GLOBAL_APPLY] = {
 227                 .type = SWITCH_TYPE_NOVAL,
 228                 .name = "apply",
 229                 .description = "Activate changes in the hardware",
 230                 .set = swconfig_apply_config,
 231         },
 232         [GLOBAL_RESET] = {
 233                 .type = SWITCH_TYPE_NOVAL,
 234                 .name = "reset",
 235                 .description = "Reset the switch",
 236                 .set = swconfig_reset_switch,
 237         }
 238 };
 239
 240 static struct switch_attr default_port[] = {
 241         [PORT_PVID] = {
 242                 .type = SWITCH_TYPE_INT,
 243                 .name = "pvid",
 244                 .description = "Primary VLAN ID",
 245                 .set = swconfig_set_pvid,
 246                 .get = swconfig_get_pvid,
 247         },
 248         [PORT_LINK] = {
 249                 .type = SWITCH_TYPE_STRING,
 250                 .name = "link",
 251                 .description = "Get port link information",
 252                 .set = NULL,
 253                 .get = swconfig_get_link,
 254         }
 255 };
 256
 257 static struct switch_attr default_vlan[] = {
 258         [VLAN_PORTS] = {
 259                 .type = SWITCH_TYPE_PORTS,
 260                 .name = "ports",
 261                 .description = "VLAN port mapping",
 262                 .set = swconfig_set_vlan_ports,
 263                 .get = swconfig_get_vlan_ports,
 264         },
 265 };
 266
 267 static const struct switch_attr *
 268 swconfig_find_attr_by_name(const struct switch_attrlist *alist,
 269                                 const char *name)
 270 {
 271         int i;
 272
 273         for (i = 0; i < alist->n_attr; i++)
 274                 if (strcmp(name, alist->attr[i].name) == 0)
 275                         return &alist->attr[i];
 276
 277         return NULL;
 278 }
 279
 280 static void swconfig_defaults_init(struct switch_dev *dev)
 281 {
 282         const struct switch_dev_ops *ops = dev->ops;
 283
 284         dev->def_global = 0;
 285         dev->def_vlan = 0;
 286         dev->def_port = 0;
 287
 288         if (ops->get_vlan_ports || ops->set_vlan_ports)
 289                 set_bit(VLAN_PORTS, &dev->def_vlan);
 290
 291         if (ops->get_port_pvid || ops->set_port_pvid)
 292                 set_bit(PORT_PVID, &dev->def_port);
 293
 294         if (ops->get_port_link &&
 295             !swconfig_find_attr_by_name(&ops->attr_port, "link"))
 296                 set_bit(PORT_LINK, &dev->def_port);
 297
 298         /* always present, can be no-op */
 299         set_bit(GLOBAL_APPLY, &dev->def_global);
 300         set_bit(GLOBAL_RESET, &dev->def_global);
 301 }
 302
 303
 304 static struct genl_family switch_fam = {
 305         .id = GENL_ID_GENERATE,
 306         .name = "switch",
 307         .hdrsize = 0,
 308         .version = 1,
 309         .maxattr = SWITCH_ATTR_MAX,
 310 };
 311
 312 static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
 313         [SWITCH_ATTR_ID] = { .type = NLA_U32 },
 314         [SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
 315         [SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
 316         [SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
 317         [SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
 318         [SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
 319         [SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
 320         [SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
 321 };
 322
 323 static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
 324         [SWITCH_PORT_ID] = { .type = NLA_U32 },
 325         [SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
 326 };
 327
 328 static inline void
 329 swconfig_lock(void)
 330 {
 331         spin_lock(&swdevs_lock);
 332 }
 333
 334 static inline void
 335 swconfig_unlock(void)
 336 {
 337         spin_unlock(&swdevs_lock);
 338 }
 339
 340 static struct switch_dev *
 341 swconfig_get_dev(struct genl_info *info)
 342 {
 343         struct switch_dev *dev = NULL;
 344         struct switch_dev *p;
 345         int id;
 346
 347         if (!info->attrs[SWITCH_ATTR_ID])
 348                 goto done;
 349
 350         id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
 351         swconfig_lock();
 352         list_for_each_entry(p, &swdevs, dev_list) {
 353                 if (id != p->id)
 354                         continue;
 355
 356                 dev = p;
 357                 break;
 358         }
 359         if (dev)
 360                 mutex_lock(&dev->sw_mutex);
 361         else
 362                 pr_debug("device %d not found\n", id);
 363         swconfig_unlock();
 364 done:
 365         return dev;
 366 }
 367
 368 static inline void
 369 swconfig_put_dev(struct switch_dev *dev)
 370 {
 371         mutex_unlock(&dev->sw_mutex);
 372 }
 373
 374 static int
 375 swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
 376 {
 377         struct switch_attr *op = arg;
 378         struct genl_info *info = cb->info;
 379         struct sk_buff *msg = cb->msg;
 380         int id = cb->args[0];
 381         void *hdr;
 382
 383         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 384                         NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
 385         if (IS_ERR(hdr))
 386                 return -1;
 387
 388         if (nla_put_u32(msg, SWITCH_ATTR_OP_ID, id))
 389                 goto nla_put_failure;
 390         if (nla_put_u32(msg, SWITCH_ATTR_OP_TYPE, op->type))
 391                 goto nla_put_failure;
 392         if (nla_put_string(msg, SWITCH_ATTR_OP_NAME, op->name))
 393                 goto nla_put_failure;
 394         if (op->description)
 395                 if (nla_put_string(msg, SWITCH_ATTR_OP_DESCRIPTION,
 396                         op->description))
 397                         goto nla_put_failure;
 398
 399         genlmsg_end(msg, hdr);
 400         return msg->len;
 401 nla_put_failure:
 402         genlmsg_cancel(msg, hdr);
 403         return -EMSGSIZE;
 404 }
 405
 406 /* spread multipart messages across multiple message buffers */
 407 static int
 408 swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
 409 {
 410         struct genl_info *info = cb->info;
 411         int restart = 0;
 412         int err;
 413
 414         do {
 415                 if (!cb->msg) {
 416                         cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 417                         if (cb->msg == NULL)
 418                                 goto error;
 419                 }
 420
 421                 if (!(cb->fill(cb, arg) < 0))
 422                         break;
 423
 424                 /* fill failed, check if this was already the second attempt */
 425                 if (restart)
 426                         goto error;
 427
 428                 /* try again in a new message, send the current one */
 429                 restart = 1;
 430                 if (cb->close) {
 431                         if (cb->close(cb, arg) < 0)
 432                                 goto error;
 433                 }
 434                 err = genlmsg_reply(cb->msg, info);
 435                 cb->msg = NULL;
 436                 if (err < 0)
 437                         goto error;
 438
 439         } while (restart);
 440
 441         return 0;
 442
 443 error:
 444         if (cb->msg)
 445                 nlmsg_free(cb->msg);
 446         return -1;
 447 }
 448
 449 static int
 450 swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
 451 {
 452         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 453         const struct switch_attrlist *alist;
 454         struct switch_dev *dev;
 455         struct swconfig_callback cb;
 456         int err = -EINVAL;
 457         int i;
 458
 459         /* defaults */
 460         struct switch_attr *def_list;
 461         unsigned long *def_active;
 462         int n_def;
 463
 464         dev = swconfig_get_dev(info);
 465         if (!dev)
 466                 return -EINVAL;
 467
 468         switch (hdr->cmd) {
 469         case SWITCH_CMD_LIST_GLOBAL:
 470                 alist = &dev->ops->attr_global;
 471                 def_list = default_global;
 472                 def_active = &dev->def_global;
 473                 n_def = ARRAY_SIZE(default_global);
 474                 break;
 475         case SWITCH_CMD_LIST_VLAN:
 476                 alist = &dev->ops->attr_vlan;
 477                 def_list = default_vlan;
 478                 def_active = &dev->def_vlan;
 479                 n_def = ARRAY_SIZE(default_vlan);
 480                 break;
 481         case SWITCH_CMD_LIST_PORT:
 482                 alist = &dev->ops->attr_port;
 483                 def_list = default_port;
 484                 def_active = &dev->def_port;
 485                 n_def = ARRAY_SIZE(default_port);
 486                 break;
 487         default:
 488                 WARN_ON(1);
 489                 goto out;
 490         }
 491
 492         memset(&cb, 0, sizeof(cb));
 493         cb.info = info;
 494         cb.fill = swconfig_dump_attr;
 495         for (i = 0; i < alist->n_attr; i++) {
 496                 if (alist->attr[i].disabled)
 497                         continue;
 498                 cb.args[0] = i;
 499                 err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
 500                 if (err < 0)
 501                         goto error;
 502         }
 503
 504         /* defaults */
 505         for (i = 0; i < n_def; i++) {
 506                 if (!test_bit(i, def_active))
 507                         continue;
 508                 cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
 509                 err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
 510                 if (err < 0)
 511                         goto error;
 512         }
 513         swconfig_put_dev(dev);
 514
 515         if (!cb.msg)
 516                 return 0;
 517
 518         return genlmsg_reply(cb.msg, info);
 519
 520 error:
 521         if (cb.msg)
 522                 nlmsg_free(cb.msg);
 523 out:
 524         swconfig_put_dev(dev);
 525         return err;
 526 }
 527
 528 static const struct switch_attr *
 529 swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
 530                 struct switch_val *val)
 531 {
 532         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 533         const struct switch_attrlist *alist;
 534         const struct switch_attr *attr = NULL;
 535         int attr_id;
 536
 537         /* defaults */
 538         struct switch_attr *def_list;
 539         unsigned long *def_active;
 540         int n_def;
 541
 542         if (!info->attrs[SWITCH_ATTR_OP_ID])
 543                 goto done;
 544
 545         switch (hdr->cmd) {
 546         case SWITCH_CMD_SET_GLOBAL:
 547         case SWITCH_CMD_GET_GLOBAL:
 548                 alist = &dev->ops->attr_global;
 549                 def_list = default_global;
 550                 def_active = &dev->def_global;
 551                 n_def = ARRAY_SIZE(default_global);
 552                 break;
 553         case SWITCH_CMD_SET_VLAN:
 554         case SWITCH_CMD_GET_VLAN:
 555                 alist = &dev->ops->attr_vlan;
 556                 def_list = default_vlan;
 557                 def_active = &dev->def_vlan;
 558                 n_def = ARRAY_SIZE(default_vlan);
 559                 if (!info->attrs[SWITCH_ATTR_OP_VLAN])
 560                         goto done;
 561                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
 562                 if (val->port_vlan >= dev->vlans)
 563                         goto done;
 564                 break;
 565         case SWITCH_CMD_SET_PORT:
 566         case SWITCH_CMD_GET_PORT:
 567                 alist = &dev->ops->attr_port;
 568                 def_list = default_port;
 569                 def_active = &dev->def_port;
 570                 n_def = ARRAY_SIZE(default_port);
 571                 if (!info->attrs[SWITCH_ATTR_OP_PORT])
 572                         goto done;
 573                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
 574                 if (val->port_vlan >= dev->ports)
 575                         goto done;
 576                 break;
 577         default:
 578                 WARN_ON(1);
 579                 goto done;
 580         }
 581
 582         if (!alist)
 583                 goto done;
 584
 585         attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
 586         if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
 587                 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
 588                 if (attr_id >= n_def)
 589                         goto done;
 590                 if (!test_bit(attr_id, def_active))
 591                         goto done;
 592                 attr = &def_list[attr_id];
 593         } else {
 594                 if (attr_id >= alist->n_attr)
 595                         goto done;
 596                 attr = &alist->attr[attr_id];
 597         }
 598
 599         if (attr->disabled)
 600                 attr = NULL;
 601
 602 done:
 603         if (!attr)
 604                 pr_debug("attribute lookup failed\n");
 605         val->attr = attr;
 606         return attr;
 607 }
 608
 609 static int
 610 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 611                 struct switch_val *val, int max)
 612 {
 613         struct nlattr *nla;
 614         int rem;
 615
 616         val->len = 0;
 617         nla_for_each_nested(nla, head, rem) {
 618                 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
 619                 struct switch_port *port = &val->value.ports[val->len];
 620
 621                 if (val->len >= max)
 622                         return -EINVAL;
 623
 624                 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
 625                                 port_policy))
 626                         return -EINVAL;
 627
 628                 if (!tb[SWITCH_PORT_ID])
 629                         return -EINVAL;
 630
 631                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 632                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 633                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 634                 val->len++;
 635         }
 636
 637         return 0;
 638 }
 639
 640 static int
 641 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 642 {
 643         const struct switch_attr *attr;
 644         struct switch_dev *dev;
 645         struct switch_val val;
 646         int err = -EINVAL;
 647
 648         dev = swconfig_get_dev(info);
 649         if (!dev)
 650                 return -EINVAL;
 651
 652         memset(&val, 0, sizeof(val));
 653         attr = swconfig_lookup_attr(dev, info, &val);
 654         if (!attr || !attr->set)
 655                 goto error;
 656
 657         val.attr = attr;
 658         switch (attr->type) {
 659         case SWITCH_TYPE_NOVAL:
 660                 break;
 661         case SWITCH_TYPE_INT:
 662                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
 663                         goto error;
 664                 val.value.i =
 665                         nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
 666                 break;
 667         case SWITCH_TYPE_STRING:
 668                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
 669                         goto error;
 670                 val.value.s =
 671                         nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
 672                 break;
 673         case SWITCH_TYPE_PORTS:
 674                 val.value.ports = dev->portbuf;
 675                 memset(dev->portbuf, 0,
 676                         sizeof(struct switch_port) * dev->ports);
 677
 678                 /* TODO: implement multipart? */
 679                 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
 680                         err = swconfig_parse_ports(skb,
 681                                 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS],
 682                                 &val, dev->ports);
 683                         if (err < 0)
 684                                 goto error;
 685                 } else {
 686                         val.len = 0;
 687                         err = 0;
 688                 }
 689                 break;
 690         default:
 691                 goto error;
 692         }
 693
 694         err = attr->set(dev, attr, &val);
 695 error:
 696         swconfig_put_dev(dev);
 697         return err;
 698 }
 699
 700 static int
 701 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
 702 {
 703         if (cb->nest[0])
 704                 nla_nest_end(cb->msg, cb->nest[0]);
 705         return 0;
 706 }
 707
 708 static int
 709 swconfig_send_port(struct swconfig_callback *cb, void *arg)
 710 {
 711         const struct switch_port *port = arg;
 712         struct nlattr *p = NULL;
 713
 714         if (!cb->nest[0]) {
 715                 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
 716                 if (!cb->nest[0])
 717                         return -1;
 718         }
 719
 720         p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
 721         if (!p)
 722                 goto error;
 723
 724         if (nla_put_u32(cb->msg, SWITCH_PORT_ID, port->id))
 725                 goto nla_put_failure;
 726         if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
 727                 if (nla_put_flag(cb->msg, SWITCH_PORT_FLAG_TAGGED))
 728                         goto nla_put_failure;
 729         }
 730
 731         nla_nest_end(cb->msg, p);
 732         return 0;
 733
 734 nla_put_failure:
 735                 nla_nest_cancel(cb->msg, p);
 736 error:
 737         nla_nest_cancel(cb->msg, cb->nest[0]);
 738         return -1;
 739 }
 740
 741 static int
 742 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
 743                 const struct switch_val *val)
 744 {
 745         struct swconfig_callback cb;
 746         int err = 0;
 747         int i;
 748
 749         if (!val->value.ports)
 750                 return -EINVAL;
 751
 752         memset(&cb, 0, sizeof(cb));
 753         cb.cmd = attr;
 754         cb.msg = *msg;
 755         cb.info = info;
 756         cb.fill = swconfig_send_port;
 757         cb.close = swconfig_close_portlist;
 758
 759         cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
 760         for (i = 0; i < val->len; i++) {
 761                 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
 762                 if (err)
 763                         goto done;
 764         }
 765         err = val->len;
 766         swconfig_close_portlist(&cb, NULL);
 767         *msg = cb.msg;
 768
 769 done:
 770         return err;
 771 }
 772
 773 static int
 774 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 775 {
 776         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 777         const struct switch_attr *attr;
 778         struct switch_dev *dev;
 779         struct sk_buff *msg = NULL;
 780         struct switch_val val;
 781         int err = -EINVAL;
 782         int cmd = hdr->cmd;
 783
 784         dev = swconfig_get_dev(info);
 785         if (!dev)
 786                 return -EINVAL;
 787
 788         memset(&val, 0, sizeof(val));
 789         attr = swconfig_lookup_attr(dev, info, &val);
 790         if (!attr || !attr->get)
 791                 goto error;
 792
 793         if (attr->type == SWITCH_TYPE_PORTS) {
 794                 val.value.ports = dev->portbuf;
 795                 memset(dev->portbuf, 0,
 796                         sizeof(struct switch_port) * dev->ports);
 797         }
 798
 799         err = attr->get(dev, attr, &val);
 800         if (err)
 801                 goto error;
 802
 803         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 804         if (!msg)
 805                 goto error;
 806
 807         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 808                         0, cmd);
 809         if (IS_ERR(hdr))
 810                 goto nla_put_failure;
 811
 812         switch (attr->type) {
 813         case SWITCH_TYPE_INT:
 814                 if (nla_put_u32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i))
 815                         goto nla_put_failure;
 816                 break;
 817         case SWITCH_TYPE_STRING:
 818                 if (nla_put_string(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s))
 819                         goto nla_put_failure;
 820                 break;
 821         case SWITCH_TYPE_PORTS:
 822                 err = swconfig_send_ports(&msg, info,
 823                                 SWITCH_ATTR_OP_VALUE_PORTS, &val);
 824                 if (err < 0)
 825                         goto nla_put_failure;
 826                 break;
 827         default:
 828                 pr_debug("invalid type in attribute\n");
 829                 err = -EINVAL;
 830                 goto error;
 831         }
 832         genlmsg_end(msg, hdr);
 833         err = msg->len;
 834         if (err < 0)
 835                 goto nla_put_failure;
 836
 837         swconfig_put_dev(dev);
 838         return genlmsg_reply(msg, info);
 839
 840 nla_put_failure:
 841         if (msg)
 842                 nlmsg_free(msg);
 843 error:
 844         swconfig_put_dev(dev);
 845         if (!err)
 846                 err = -ENOMEM;
 847         return err;
 848 }
 849
 850 static int
 851 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 852                 const struct switch_dev *dev)
 853 {
 854         struct nlattr *p = NULL, *m = NULL;
 855         void *hdr;
 856         int i;
 857
 858         hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
 859                         SWITCH_CMD_NEW_ATTR);
 860         if (IS_ERR(hdr))
 861                 return -1;
 862
 863         if (nla_put_u32(msg, SWITCH_ATTR_ID, dev->id))
 864                 goto nla_put_failure;
 865         if (nla_put_string(msg, SWITCH_ATTR_DEV_NAME, dev->devname))
 866                 goto nla_put_failure;
 867         if (nla_put_string(msg, SWITCH_ATTR_ALIAS, dev->alias))
 868                 goto nla_put_failure;
 869         if (nla_put_string(msg, SWITCH_ATTR_NAME, dev->name))
 870                 goto nla_put_failure;
 871         if (nla_put_u32(msg, SWITCH_ATTR_VLANS, dev->vlans))
 872                 goto nla_put_failure;
 873         if (nla_put_u32(msg, SWITCH_ATTR_PORTS, dev->ports))
 874                 goto nla_put_failure;
 875         if (nla_put_u32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port))
 876                 goto nla_put_failure;
 877
 878         m = nla_nest_start(msg, SWITCH_ATTR_PORTMAP);
 879         if (!m)
 880                 goto nla_put_failure;
 881         for (i = 0; i < dev->ports; i++) {
 882                 p = nla_nest_start(msg, SWITCH_ATTR_PORTS);
 883                 if (!p)
 884                         continue;
 885                 if (dev->portmap[i].s) {
 886                         if (nla_put_string(msg, SWITCH_PORTMAP_SEGMENT,
 887                                                 dev->portmap[i].s))
 888                                 goto nla_put_failure;
 889                         if (nla_put_u32(msg, SWITCH_PORTMAP_VIRT,
 890                                                 dev->portmap[i].virt))
 891                                 goto nla_put_failure;
 892                 }
 893                 nla_nest_end(msg, p);
 894         }
 895         nla_nest_end(msg, m);
 896         genlmsg_end(msg, hdr);
 897         return msg->len;
 898 nla_put_failure:
 899         genlmsg_cancel(msg, hdr);
 900         return -EMSGSIZE;
 901 }
 902
 903 static int swconfig_dump_switches(struct sk_buff *skb,
 904                 struct netlink_callback *cb)
 905 {
 906         struct switch_dev *dev;
 907         int start = cb->args[0];
 908         int idx = 0;
 909
 910         swconfig_lock();
 911         list_for_each_entry(dev, &swdevs, dev_list) {
 912                 if (++idx <= start)
 913                         continue;
 914                 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).portid,
 915                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 916                                 dev) < 0)
 917                         break;
 918         }
 919         swconfig_unlock();
 920         cb->args[0] = idx;
 921
 922         return skb->len;
 923 }
 924
 925 static int
 926 swconfig_done(struct netlink_callback *cb)
 927 {
 928         return 0;
 929 }
 930
 931 static struct genl_ops swconfig_ops[] = {
 932         {
 933                 .cmd = SWITCH_CMD_LIST_GLOBAL,
 934                 .doit = swconfig_list_attrs,
 935                 .policy = switch_policy,
 936         },
 937         {
 938                 .cmd = SWITCH_CMD_LIST_VLAN,
 939                 .doit = swconfig_list_attrs,
 940                 .policy = switch_policy,
 941         },
 942         {
 943                 .cmd = SWITCH_CMD_LIST_PORT,
 944                 .doit = swconfig_list_attrs,
 945                 .policy = switch_policy,
 946         },
 947         {
 948                 .cmd = SWITCH_CMD_GET_GLOBAL,
 949                 .doit = swconfig_get_attr,
 950                 .policy = switch_policy,
 951         },
 952         {
 953                 .cmd = SWITCH_CMD_GET_VLAN,
 954                 .doit = swconfig_get_attr,
 955                 .policy = switch_policy,
 956         },
 957         {
 958                 .cmd = SWITCH_CMD_GET_PORT,
 959                 .doit = swconfig_get_attr,
 960                 .policy = switch_policy,
 961         },
 962         {
 963                 .cmd = SWITCH_CMD_SET_GLOBAL,
 964                 .doit = swconfig_set_attr,
 965                 .policy = switch_policy,
 966         },
 967         {
 968                 .cmd = SWITCH_CMD_SET_VLAN,
 969                 .doit = swconfig_set_attr,
 970                 .policy = switch_policy,
 971         },
 972         {
 973                 .cmd = SWITCH_CMD_SET_PORT,
 974                 .doit = swconfig_set_attr,
 975                 .policy = switch_policy,
 976         },
 977         {
 978                 .cmd = SWITCH_CMD_GET_SWITCH,
 979                 .dumpit = swconfig_dump_switches,
 980                 .policy = switch_policy,
 981                 .done = swconfig_done,
 982         }
 983 };
 984
 985 #ifdef CONFIG_OF
 986 void
 987 of_switch_load_portmap(struct switch_dev *dev)
 988 {
 989         struct device_node *port;
 990
 991         if (!dev->of_node)
 992                 return;
 993
 994         for_each_child_of_node(dev->of_node, port) {
 995                 const __be32 *prop;
 996                 const char *segment;
 997                 int size, phys;
 998
 999                 if (!of_device_is_compatible(port, "swconfig,port"))
1000                         continue;
1001
1002                 if (of_property_read_string(port, "swconfig,segment", &segment))
1003                         continue;
1004
1005                 prop = of_get_property(port, "swconfig,portmap", &size);
1006                 if (!prop)
1007                         continue;
1008
1009                 if (size != (2 * sizeof(*prop))) {
1010                         pr_err("%s: failed to parse port mapping\n",
1011                                         port->name);
1012                         continue;
1013                 }
1014
1015                 phys = be32_to_cpup(prop++);
1016                 if ((phys < 0) | (phys >= dev->ports)) {
1017                         pr_err("%s: physical port index out of range\n",
1018                                         port->name);
1019                         continue;
1020                 }
1021
1022                 dev->portmap[phys].s = kstrdup(segment, GFP_KERNEL);
1023                 dev->portmap[phys].virt = be32_to_cpup(prop);
1024                 pr_debug("Found port: %s, physical: %d, virtual: %d\n",
1025                         segment, phys, dev->portmap[phys].virt);
1026         }
1027 }
1028 #endif
1029
1030 int
1031 register_switch(struct switch_dev *dev, struct net_device *netdev)
1032 {
1033         struct switch_dev *sdev;
1034         const int max_switches = 8 * sizeof(unsigned long);
1035         unsigned long in_use = 0;
1036         int err;
1037         int i;
1038
1039         INIT_LIST_HEAD(&dev->dev_list);
1040         if (netdev) {
1041                 dev->netdev = netdev;
1042                 if (!dev->alias)
1043                         dev->alias = netdev->name;
1044         }
1045         BUG_ON(!dev->alias);
1046
1047         if (dev->ports > 0) {
1048                 dev->portbuf = kzalloc(sizeof(struct switch_port) *
1049                                 dev->ports, GFP_KERNEL);
1050                 if (!dev->portbuf)
1051                         return -ENOMEM;
1052                 dev->portmap = kzalloc(sizeof(struct switch_portmap) *
1053                                 dev->ports, GFP_KERNEL);
1054                 if (!dev->portmap) {
1055                         kfree(dev->portbuf);
1056                         return -ENOMEM;
1057                 }
1058         }
1059         swconfig_defaults_init(dev);
1060         mutex_init(&dev->sw_mutex);
1061         swconfig_lock();
1062         dev->id = ++swdev_id;
1063
1064         list_for_each_entry(sdev, &swdevs, dev_list) {
1065                 if (!sscanf(sdev->devname, SWCONFIG_DEVNAME, &i))
1066                         continue;
1067                 if (i < 0 || i > max_switches)
1068                         continue;
1069
1070                 set_bit(i, &in_use);
1071         }
1072         i = find_first_zero_bit(&in_use, max_switches);
1073
1074         if (i == max_switches) {
1075                 swconfig_unlock();
1076                 return -ENFILE;
1077         }
1078
1079 #ifdef CONFIG_OF
1080         if (dev->ports)
1081                 of_switch_load_portmap(dev);
1082 #endif
1083
1084         /* fill device name */
1085         snprintf(dev->devname, IFNAMSIZ, SWCONFIG_DEVNAME, i);
1086
1087         list_add_tail(&dev->dev_list, &swdevs);
1088         swconfig_unlock();
1089
1090         err = swconfig_create_led_trigger(dev);
1091         if (err)
1092                 return err;
1093
1094         return 0;
1095 }
1096 EXPORT_SYMBOL_GPL(register_switch);
1097
1098 void
1099 unregister_switch(struct switch_dev *dev)
1100 {
1101         swconfig_destroy_led_trigger(dev);
1102         kfree(dev->portbuf);
1103         mutex_lock(&dev->sw_mutex);
1104         swconfig_lock();
1105         list_del(&dev->dev_list);
1106         swconfig_unlock();
1107         mutex_unlock(&dev->sw_mutex);
1108 }
1109 EXPORT_SYMBOL_GPL(unregister_switch);
1110
1111
1112 static int __init
1113 swconfig_init(void)
1114 {
1115         int err;
1116 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0))
1117         int i;
1118 #endif
1119
1120         INIT_LIST_HEAD(&swdevs);
1121
1122 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0))
1123         err = genl_register_family(&switch_fam);
1124         if (err)
1125                 return err;
1126
1127         for (i = 0; i < ARRAY_SIZE(swconfig_ops); i++) {
1128                 err = genl_register_ops(&switch_fam, &swconfig_ops[i]);
1129                 if (err)
1130                         goto unregister;
1131         }
1132         return 0;
1133
1134 unregister:
1135         genl_unregister_family(&switch_fam);
1136         return err;
1137 #else
1138         err = genl_register_family_with_ops(&switch_fam, swconfig_ops);
1139         if (err)
1140                 return err;
1141         return 0;
1142 #endif
1143 }
1144
1145 static void __exit
1146 swconfig_exit(void)
1147 {
1148         genl_unregister_family(&switch_fam);
1149 }
1150
1151 module_init(swconfig_init);
1152 module_exit(swconfig_exit);
1153