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         return genlmsg_end(msg, hdr);
 400 nla_put_failure:
 401         genlmsg_cancel(msg, hdr);
 402         return -EMSGSIZE;
 403 }
 404
 405 /* spread multipart messages across multiple message buffers */
 406 static int
 407 swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
 408 {
 409         struct genl_info *info = cb->info;
 410         int restart = 0;
 411         int err;
 412
 413         do {
 414                 if (!cb->msg) {
 415                         cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 416                         if (cb->msg == NULL)
 417                                 goto error;
 418                 }
 419
 420                 if (!(cb->fill(cb, arg) < 0))
 421                         break;
 422
 423                 /* fill failed, check if this was already the second attempt */
 424                 if (restart)
 425                         goto error;
 426
 427                 /* try again in a new message, send the current one */
 428                 restart = 1;
 429                 if (cb->close) {
 430                         if (cb->close(cb, arg) < 0)
 431                                 goto error;
 432                 }
 433                 err = genlmsg_reply(cb->msg, info);
 434                 cb->msg = NULL;
 435                 if (err < 0)
 436                         goto error;
 437
 438         } while (restart);
 439
 440         return 0;
 441
 442 error:
 443         if (cb->msg)
 444                 nlmsg_free(cb->msg);
 445         return -1;
 446 }
 447
 448 static int
 449 swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
 450 {
 451         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 452         const struct switch_attrlist *alist;
 453         struct switch_dev *dev;
 454         struct swconfig_callback cb;
 455         int err = -EINVAL;
 456         int i;
 457
 458         /* defaults */
 459         struct switch_attr *def_list;
 460         unsigned long *def_active;
 461         int n_def;
 462
 463         dev = swconfig_get_dev(info);
 464         if (!dev)
 465                 return -EINVAL;
 466
 467         switch (hdr->cmd) {
 468         case SWITCH_CMD_LIST_GLOBAL:
 469                 alist = &dev->ops->attr_global;
 470                 def_list = default_global;
 471                 def_active = &dev->def_global;
 472                 n_def = ARRAY_SIZE(default_global);
 473                 break;
 474         case SWITCH_CMD_LIST_VLAN:
 475                 alist = &dev->ops->attr_vlan;
 476                 def_list = default_vlan;
 477                 def_active = &dev->def_vlan;
 478                 n_def = ARRAY_SIZE(default_vlan);
 479                 break;
 480         case SWITCH_CMD_LIST_PORT:
 481                 alist = &dev->ops->attr_port;
 482                 def_list = default_port;
 483                 def_active = &dev->def_port;
 484                 n_def = ARRAY_SIZE(default_port);
 485                 break;
 486         default:
 487                 WARN_ON(1);
 488                 goto out;
 489         }
 490
 491         memset(&cb, 0, sizeof(cb));
 492         cb.info = info;
 493         cb.fill = swconfig_dump_attr;
 494         for (i = 0; i < alist->n_attr; i++) {
 495                 if (alist->attr[i].disabled)
 496                         continue;
 497                 cb.args[0] = i;
 498                 err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
 499                 if (err < 0)
 500                         goto error;
 501         }
 502
 503         /* defaults */
 504         for (i = 0; i < n_def; i++) {
 505                 if (!test_bit(i, def_active))
 506                         continue;
 507                 cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
 508                 err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
 509                 if (err < 0)
 510                         goto error;
 511         }
 512         swconfig_put_dev(dev);
 513
 514         if (!cb.msg)
 515                 return 0;
 516
 517         return genlmsg_reply(cb.msg, info);
 518
 519 error:
 520         if (cb.msg)
 521                 nlmsg_free(cb.msg);
 522 out:
 523         swconfig_put_dev(dev);
 524         return err;
 525 }
 526
 527 static const struct switch_attr *
 528 swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
 529                 struct switch_val *val)
 530 {
 531         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 532         const struct switch_attrlist *alist;
 533         const struct switch_attr *attr = NULL;
 534         int attr_id;
 535
 536         /* defaults */
 537         struct switch_attr *def_list;
 538         unsigned long *def_active;
 539         int n_def;
 540
 541         if (!info->attrs[SWITCH_ATTR_OP_ID])
 542                 goto done;
 543
 544         switch (hdr->cmd) {
 545         case SWITCH_CMD_SET_GLOBAL:
 546         case SWITCH_CMD_GET_GLOBAL:
 547                 alist = &dev->ops->attr_global;
 548                 def_list = default_global;
 549                 def_active = &dev->def_global;
 550                 n_def = ARRAY_SIZE(default_global);
 551                 break;
 552         case SWITCH_CMD_SET_VLAN:
 553         case SWITCH_CMD_GET_VLAN:
 554                 alist = &dev->ops->attr_vlan;
 555                 def_list = default_vlan;
 556                 def_active = &dev->def_vlan;
 557                 n_def = ARRAY_SIZE(default_vlan);
 558                 if (!info->attrs[SWITCH_ATTR_OP_VLAN])
 559                         goto done;
 560                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
 561                 if (val->port_vlan >= dev->vlans)
 562                         goto done;
 563                 break;
 564         case SWITCH_CMD_SET_PORT:
 565         case SWITCH_CMD_GET_PORT:
 566                 alist = &dev->ops->attr_port;
 567                 def_list = default_port;
 568                 def_active = &dev->def_port;
 569                 n_def = ARRAY_SIZE(default_port);
 570                 if (!info->attrs[SWITCH_ATTR_OP_PORT])
 571                         goto done;
 572                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
 573                 if (val->port_vlan >= dev->ports)
 574                         goto done;
 575                 break;
 576         default:
 577                 WARN_ON(1);
 578                 goto done;
 579         }
 580
 581         if (!alist)
 582                 goto done;
 583
 584         attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
 585         if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
 586                 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
 587                 if (attr_id >= n_def)
 588                         goto done;
 589                 if (!test_bit(attr_id, def_active))
 590                         goto done;
 591                 attr = &def_list[attr_id];
 592         } else {
 593                 if (attr_id >= alist->n_attr)
 594                         goto done;
 595                 attr = &alist->attr[attr_id];
 596         }
 597
 598         if (attr->disabled)
 599                 attr = NULL;
 600
 601 done:
 602         if (!attr)
 603                 pr_debug("attribute lookup failed\n");
 604         val->attr = attr;
 605         return attr;
 606 }
 607
 608 static int
 609 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 610                 struct switch_val *val, int max)
 611 {
 612         struct nlattr *nla;
 613         int rem;
 614
 615         val->len = 0;
 616         nla_for_each_nested(nla, head, rem) {
 617                 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
 618                 struct switch_port *port = &val->value.ports[val->len];
 619
 620                 if (val->len >= max)
 621                         return -EINVAL;
 622
 623                 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
 624                                 port_policy))
 625                         return -EINVAL;
 626
 627                 if (!tb[SWITCH_PORT_ID])
 628                         return -EINVAL;
 629
 630                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 631                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 632                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 633                 val->len++;
 634         }
 635
 636         return 0;
 637 }
 638
 639 static int
 640 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 641 {
 642         const struct switch_attr *attr;
 643         struct switch_dev *dev;
 644         struct switch_val val;
 645         int err = -EINVAL;
 646
 647         dev = swconfig_get_dev(info);
 648         if (!dev)
 649                 return -EINVAL;
 650
 651         memset(&val, 0, sizeof(val));
 652         attr = swconfig_lookup_attr(dev, info, &val);
 653         if (!attr || !attr->set)
 654                 goto error;
 655
 656         val.attr = attr;
 657         switch (attr->type) {
 658         case SWITCH_TYPE_NOVAL:
 659                 break;
 660         case SWITCH_TYPE_INT:
 661                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
 662                         goto error;
 663                 val.value.i =
 664                         nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
 665                 break;
 666         case SWITCH_TYPE_STRING:
 667                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
 668                         goto error;
 669                 val.value.s =
 670                         nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
 671                 break;
 672         case SWITCH_TYPE_PORTS:
 673                 val.value.ports = dev->portbuf;
 674                 memset(dev->portbuf, 0,
 675                         sizeof(struct switch_port) * dev->ports);
 676
 677                 /* TODO: implement multipart? */
 678                 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
 679                         err = swconfig_parse_ports(skb,
 680                                 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS],
 681                                 &val, dev->ports);
 682                         if (err < 0)
 683                                 goto error;
 684                 } else {
 685                         val.len = 0;
 686                         err = 0;
 687                 }
 688                 break;
 689         default:
 690                 goto error;
 691         }
 692
 693         err = attr->set(dev, attr, &val);
 694 error:
 695         swconfig_put_dev(dev);
 696         return err;
 697 }
 698
 699 static int
 700 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
 701 {
 702         if (cb->nest[0])
 703                 nla_nest_end(cb->msg, cb->nest[0]);
 704         return 0;
 705 }
 706
 707 static int
 708 swconfig_send_port(struct swconfig_callback *cb, void *arg)
 709 {
 710         const struct switch_port *port = arg;
 711         struct nlattr *p = NULL;
 712
 713         if (!cb->nest[0]) {
 714                 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
 715                 if (!cb->nest[0])
 716                         return -1;
 717         }
 718
 719         p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
 720         if (!p)
 721                 goto error;
 722
 723         if (nla_put_u32(cb->msg, SWITCH_PORT_ID, port->id))
 724                 goto nla_put_failure;
 725         if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
 726                 if (nla_put_flag(cb->msg, SWITCH_PORT_FLAG_TAGGED))
 727                         goto nla_put_failure;
 728         }
 729
 730         nla_nest_end(cb->msg, p);
 731         return 0;
 732
 733 nla_put_failure:
 734                 nla_nest_cancel(cb->msg, p);
 735 error:
 736         nla_nest_cancel(cb->msg, cb->nest[0]);
 737         return -1;
 738 }
 739
 740 static int
 741 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
 742                 const struct switch_val *val)
 743 {
 744         struct swconfig_callback cb;
 745         int err = 0;
 746         int i;
 747
 748         if (!val->value.ports)
 749                 return -EINVAL;
 750
 751         memset(&cb, 0, sizeof(cb));
 752         cb.cmd = attr;
 753         cb.msg = *msg;
 754         cb.info = info;
 755         cb.fill = swconfig_send_port;
 756         cb.close = swconfig_close_portlist;
 757
 758         cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
 759         for (i = 0; i < val->len; i++) {
 760                 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
 761                 if (err)
 762                         goto done;
 763         }
 764         err = val->len;
 765         swconfig_close_portlist(&cb, NULL);
 766         *msg = cb.msg;
 767
 768 done:
 769         return err;
 770 }
 771
 772 static int
 773 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 774 {
 775         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 776         const struct switch_attr *attr;
 777         struct switch_dev *dev;
 778         struct sk_buff *msg = NULL;
 779         struct switch_val val;
 780         int err = -EINVAL;
 781         int cmd = hdr->cmd;
 782
 783         dev = swconfig_get_dev(info);
 784         if (!dev)
 785                 return -EINVAL;
 786
 787         memset(&val, 0, sizeof(val));
 788         attr = swconfig_lookup_attr(dev, info, &val);
 789         if (!attr || !attr->get)
 790                 goto error;
 791
 792         if (attr->type == SWITCH_TYPE_PORTS) {
 793                 val.value.ports = dev->portbuf;
 794                 memset(dev->portbuf, 0,
 795                         sizeof(struct switch_port) * dev->ports);
 796         }
 797
 798         err = attr->get(dev, attr, &val);
 799         if (err)
 800                 goto error;
 801
 802         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 803         if (!msg)
 804                 goto error;
 805
 806         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 807                         0, cmd);
 808         if (IS_ERR(hdr))
 809                 goto nla_put_failure;
 810
 811         switch (attr->type) {
 812         case SWITCH_TYPE_INT:
 813                 if (nla_put_u32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i))
 814                         goto nla_put_failure;
 815                 break;
 816         case SWITCH_TYPE_STRING:
 817                 if (nla_put_string(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s))
 818                         goto nla_put_failure;
 819                 break;
 820         case SWITCH_TYPE_PORTS:
 821                 err = swconfig_send_ports(&msg, info,
 822                                 SWITCH_ATTR_OP_VALUE_PORTS, &val);
 823                 if (err < 0)
 824                         goto nla_put_failure;
 825                 break;
 826         default:
 827                 pr_debug("invalid type in attribute\n");
 828                 err = -EINVAL;
 829                 goto error;
 830         }
 831         err = genlmsg_end(msg, hdr);
 832         if (err < 0)
 833                 goto nla_put_failure;
 834
 835         swconfig_put_dev(dev);
 836         return genlmsg_reply(msg, info);
 837
 838 nla_put_failure:
 839         if (msg)
 840                 nlmsg_free(msg);
 841 error:
 842         swconfig_put_dev(dev);
 843         if (!err)
 844                 err = -ENOMEM;
 845         return err;
 846 }
 847
 848 static int
 849 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 850                 const struct switch_dev *dev)
 851 {
 852         struct nlattr *p = NULL, *m = NULL;
 853         void *hdr;
 854         int i;
 855
 856         hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
 857                         SWITCH_CMD_NEW_ATTR);
 858         if (IS_ERR(hdr))
 859                 return -1;
 860
 861         if (nla_put_u32(msg, SWITCH_ATTR_ID, dev->id))
 862                 goto nla_put_failure;
 863         if (nla_put_string(msg, SWITCH_ATTR_DEV_NAME, dev->devname))
 864                 goto nla_put_failure;
 865         if (nla_put_string(msg, SWITCH_ATTR_ALIAS, dev->alias))
 866                 goto nla_put_failure;
 867         if (nla_put_string(msg, SWITCH_ATTR_NAME, dev->name))
 868                 goto nla_put_failure;
 869         if (nla_put_u32(msg, SWITCH_ATTR_VLANS, dev->vlans))
 870                 goto nla_put_failure;
 871         if (nla_put_u32(msg, SWITCH_ATTR_PORTS, dev->ports))
 872                 goto nla_put_failure;
 873         if (nla_put_u32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port))
 874                 goto nla_put_failure;
 875
 876         m = nla_nest_start(msg, SWITCH_ATTR_PORTMAP);
 877         if (!m)
 878                 goto nla_put_failure;
 879         for (i = 0; i < dev->ports; i++) {
 880                 p = nla_nest_start(msg, SWITCH_ATTR_PORTS);
 881                 if (!p)
 882                         continue;
 883                 if (dev->portmap[i].s) {
 884                         if (nla_put_string(msg, SWITCH_PORTMAP_SEGMENT,
 885                                                 dev->portmap[i].s))
 886                                 goto nla_put_failure;
 887                         if (nla_put_u32(msg, SWITCH_PORTMAP_VIRT,
 888                                                 dev->portmap[i].virt))
 889                                 goto nla_put_failure;
 890                 }
 891                 nla_nest_end(msg, p);
 892         }
 893         nla_nest_end(msg, m);
 894         return genlmsg_end(msg, hdr);
 895 nla_put_failure:
 896         genlmsg_cancel(msg, hdr);
 897         return -EMSGSIZE;
 898 }
 899
 900 static int swconfig_dump_switches(struct sk_buff *skb,
 901                 struct netlink_callback *cb)
 902 {
 903         struct switch_dev *dev;
 904         int start = cb->args[0];
 905         int idx = 0;
 906
 907         swconfig_lock();
 908         list_for_each_entry(dev, &swdevs, dev_list) {
 909                 if (++idx <= start)
 910                         continue;
 911                 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).portid,
 912                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 913                                 dev) < 0)
 914                         break;
 915         }
 916         swconfig_unlock();
 917         cb->args[0] = idx;
 918
 919         return skb->len;
 920 }
 921
 922 static int
 923 swconfig_done(struct netlink_callback *cb)
 924 {
 925         return 0;
 926 }
 927
 928 static struct genl_ops swconfig_ops[] = {
 929         {
 930                 .cmd = SWITCH_CMD_LIST_GLOBAL,
 931                 .doit = swconfig_list_attrs,
 932                 .policy = switch_policy,
 933         },
 934         {
 935                 .cmd = SWITCH_CMD_LIST_VLAN,
 936                 .doit = swconfig_list_attrs,
 937                 .policy = switch_policy,
 938         },
 939         {
 940                 .cmd = SWITCH_CMD_LIST_PORT,
 941                 .doit = swconfig_list_attrs,
 942                 .policy = switch_policy,
 943         },
 944         {
 945                 .cmd = SWITCH_CMD_GET_GLOBAL,
 946                 .doit = swconfig_get_attr,
 947                 .policy = switch_policy,
 948         },
 949         {
 950                 .cmd = SWITCH_CMD_GET_VLAN,
 951                 .doit = swconfig_get_attr,
 952                 .policy = switch_policy,
 953         },
 954         {
 955                 .cmd = SWITCH_CMD_GET_PORT,
 956                 .doit = swconfig_get_attr,
 957                 .policy = switch_policy,
 958         },
 959         {
 960                 .cmd = SWITCH_CMD_SET_GLOBAL,
 961                 .doit = swconfig_set_attr,
 962                 .policy = switch_policy,
 963         },
 964         {
 965                 .cmd = SWITCH_CMD_SET_VLAN,
 966                 .doit = swconfig_set_attr,
 967                 .policy = switch_policy,
 968         },
 969         {
 970                 .cmd = SWITCH_CMD_SET_PORT,
 971                 .doit = swconfig_set_attr,
 972                 .policy = switch_policy,
 973         },
 974         {
 975                 .cmd = SWITCH_CMD_GET_SWITCH,
 976                 .dumpit = swconfig_dump_switches,
 977                 .policy = switch_policy,
 978                 .done = swconfig_done,
 979         }
 980 };
 981
 982 #ifdef CONFIG_OF
 983 void
 984 of_switch_load_portmap(struct switch_dev *dev)
 985 {
 986         struct device_node *port;
 987
 988         if (!dev->of_node)
 989                 return;
 990
 991         for_each_child_of_node(dev->of_node, port) {
 992                 const __be32 *prop;
 993                 const char *segment;
 994                 int size, phys;
 995
 996                 if (!of_device_is_compatible(port, "swconfig,port"))
 997                         continue;
 998
 999                 if (of_property_read_string(port, "swconfig,segment", &segment))
1000                         continue;
1001
1002                 prop = of_get_property(port, "swconfig,portmap", &size);
1003                 if (!prop)
1004                         continue;
1005
1006                 if (size != (2 * sizeof(*prop))) {
1007                         pr_err("%s: failed to parse port mapping\n",
1008                                         port->name);
1009                         continue;
1010                 }
1011
1012                 phys = be32_to_cpup(prop++);
1013                 if ((phys < 0) | (phys >= dev->ports)) {
1014                         pr_err("%s: physical port index out of range\n",
1015                                         port->name);
1016                         continue;
1017                 }
1018
1019                 dev->portmap[phys].s = kstrdup(segment, GFP_KERNEL);
1020                 dev->portmap[phys].virt = be32_to_cpup(prop);
1021                 pr_debug("Found port: %s, physical: %d, virtual: %d\n",
1022                         segment, phys, dev->portmap[phys].virt);
1023         }
1024 }
1025 #endif
1026
1027 int
1028 register_switch(struct switch_dev *dev, struct net_device *netdev)
1029 {
1030         struct switch_dev *sdev;
1031         const int max_switches = 8 * sizeof(unsigned long);
1032         unsigned long in_use = 0;
1033         int err;
1034         int i;
1035
1036         INIT_LIST_HEAD(&dev->dev_list);
1037         if (netdev) {
1038                 dev->netdev = netdev;
1039                 if (!dev->alias)
1040                         dev->alias = netdev->name;
1041         }
1042         BUG_ON(!dev->alias);
1043
1044         if (dev->ports > 0) {
1045                 dev->portbuf = kzalloc(sizeof(struct switch_port) *
1046                                 dev->ports, GFP_KERNEL);
1047                 if (!dev->portbuf)
1048                         return -ENOMEM;
1049                 dev->portmap = kzalloc(sizeof(struct switch_portmap) *
1050                                 dev->ports, GFP_KERNEL);
1051                 if (!dev->portmap) {
1052                         kfree(dev->portbuf);
1053                         return -ENOMEM;
1054                 }
1055         }
1056         swconfig_defaults_init(dev);
1057         mutex_init(&dev->sw_mutex);
1058         swconfig_lock();
1059         dev->id = ++swdev_id;
1060
1061         list_for_each_entry(sdev, &swdevs, dev_list) {
1062                 if (!sscanf(sdev->devname, SWCONFIG_DEVNAME, &i))
1063                         continue;
1064                 if (i < 0 || i > max_switches)
1065                         continue;
1066
1067                 set_bit(i, &in_use);
1068         }
1069         i = find_first_zero_bit(&in_use, max_switches);
1070
1071         if (i == max_switches) {
1072                 swconfig_unlock();
1073                 return -ENFILE;
1074         }
1075
1076 #ifdef CONFIG_OF
1077         if (dev->ports)
1078                 of_switch_load_portmap(dev);
1079 #endif
1080
1081         /* fill device name */
1082         snprintf(dev->devname, IFNAMSIZ, SWCONFIG_DEVNAME, i);
1083
1084         list_add_tail(&dev->dev_list, &swdevs);
1085         swconfig_unlock();
1086
1087         err = swconfig_create_led_trigger(dev);
1088         if (err)
1089                 return err;
1090
1091         return 0;
1092 }
1093 EXPORT_SYMBOL_GPL(register_switch);
1094
1095 void
1096 unregister_switch(struct switch_dev *dev)
1097 {
1098         swconfig_destroy_led_trigger(dev);
1099         kfree(dev->portbuf);
1100         mutex_lock(&dev->sw_mutex);
1101         swconfig_lock();
1102         list_del(&dev->dev_list);
1103         swconfig_unlock();
1104         mutex_unlock(&dev->sw_mutex);
1105 }
1106 EXPORT_SYMBOL_GPL(unregister_switch);
1107
1108
1109 static int __init
1110 swconfig_init(void)
1111 {
1112         int err;
1113 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0))
1114         int i;
1115 #endif
1116
1117         INIT_LIST_HEAD(&swdevs);
1118
1119 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,13,0))
1120         err = genl_register_family(&switch_fam);
1121         if (err)
1122                 return err;
1123
1124         for (i = 0; i < ARRAY_SIZE(swconfig_ops); i++) {
1125                 err = genl_register_ops(&switch_fam, &swconfig_ops[i]);
1126                 if (err)
1127                         goto unregister;
1128         }
1129         return 0;
1130
1131 unregister:
1132         genl_unregister_family(&switch_fam);
1133         return err;
1134 #else
1135         err = genl_register_family_with_ops(&switch_fam, swconfig_ops);
1136         if (err)
1137                 return err;
1138         return 0;
1139 #endif
1140 }
1141
1142 static void __exit
1143 swconfig_exit(void)
1144 {
1145         genl_unregister_family(&switch_fam);
1146 }
1147
1148 module_init(swconfig_init);
1149 module_exit(swconfig_exit);
1150