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

   1 /*
   2  * swconfig.c: Switch configuration API
   3  *
   4  * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/list.h>
  21 #include <linux/if.h>
  22 #include <linux/if_ether.h>
  23 #include <linux/capability.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/switch.h>
  26 #include <linux/of.h>
  27 #include <linux/version.h>
  28 #include <uapi/linux/mii.h>
  29
  30 #define SWCONFIG_DEVNAME        "switch%d"
  31
  32 #include "swconfig_leds.c"
  33
  34 MODULE_AUTHOR("Felix Fietkau <nbd@nbd.name>");
  35 MODULE_LICENSE("GPL");
  36
  37 static int swdev_id;
  38 static struct list_head swdevs;
  39 static DEFINE_MUTEX(swdevs_lock);
  40 struct swconfig_callback;
  41
  42 struct swconfig_callback {
  43         struct sk_buff *msg;
  44         struct genlmsghdr *hdr;
  45         struct genl_info *info;
  46         int cmd;
  47
  48         /* callback for filling in the message data */
  49         int (*fill)(struct swconfig_callback *cb, void *arg);
  50
  51         /* callback for closing the message before sending it */
  52         int (*close)(struct swconfig_callback *cb, void *arg);
  53
  54         struct nlattr *nest[4];
  55         int args[4];
  56 };
  57
  58 /* defaults */
  59
  60 static int
  61 swconfig_get_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr,
  62                         struct switch_val *val)
  63 {
  64         int ret;
  65         if (val->port_vlan >= dev->vlans)
  66                 return -EINVAL;
  67
  68         if (!dev->ops->get_vlan_ports)
  69                 return -EOPNOTSUPP;
  70
  71         ret = dev->ops->get_vlan_ports(dev, val);
  72         return ret;
  73 }
  74
  75 static int
  76 swconfig_set_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr,
  77                         struct switch_val *val)
  78 {
  79         struct switch_port *ports = val->value.ports;
  80         const struct switch_dev_ops *ops = dev->ops;
  81         int i;
  82
  83         if (val->port_vlan >= dev->vlans)
  84                 return -EINVAL;
  85
  86         /* validate ports */
  87         if (val->len > dev->ports)
  88                 return -EINVAL;
  89
  90         if (!ops->set_vlan_ports)
  91                 return -EOPNOTSUPP;
  92
  93         for (i = 0; i < val->len; i++) {
  94                 if (ports[i].id >= dev->ports)
  95                         return -EINVAL;
  96
  97                 if (ops->set_port_pvid &&
  98                     !(ports[i].flags & (1 << SWITCH_PORT_FLAG_TAGGED)))
  99                         ops->set_port_pvid(dev, ports[i].id, val->port_vlan);
 100         }
 101
 102         return ops->set_vlan_ports(dev, val);
 103 }
 104
 105 static int
 106 swconfig_set_pvid(struct switch_dev *dev, const struct switch_attr *attr,
 107                         struct switch_val *val)
 108 {
 109         if (val->port_vlan >= dev->ports)
 110                 return -EINVAL;
 111
 112         if (!dev->ops->set_port_pvid)
 113                 return -EOPNOTSUPP;
 114
 115         return dev->ops->set_port_pvid(dev, val->port_vlan, val->value.i);
 116 }
 117
 118 static int
 119 swconfig_get_pvid(struct switch_dev *dev, const struct switch_attr *attr,
 120                         struct switch_val *val)
 121 {
 122         if (val->port_vlan >= dev->ports)
 123                 return -EINVAL;
 124
 125         if (!dev->ops->get_port_pvid)
 126                 return -EOPNOTSUPP;
 127
 128         return dev->ops->get_port_pvid(dev, val->port_vlan, &val->value.i);
 129 }
 130
 131 static int
 132 swconfig_set_link(struct switch_dev *dev, const struct switch_attr *attr,
 133                         struct switch_val *val)
 134 {
 135         if (!dev->ops->set_port_link)
 136                 return -EOPNOTSUPP;
 137
 138         return dev->ops->set_port_link(dev, val->port_vlan, val->value.link);
 139 }
 140
 141 static int
 142 swconfig_get_link(struct switch_dev *dev, const struct switch_attr *attr,
 143                         struct switch_val *val)
 144 {
 145         struct switch_port_link *link = val->value.link;
 146
 147         if (val->port_vlan >= dev->ports)
 148                 return -EINVAL;
 149
 150         if (!dev->ops->get_port_link)
 151                 return -EOPNOTSUPP;
 152
 153         memset(link, 0, sizeof(*link));
 154         return dev->ops->get_port_link(dev, val->port_vlan, link);
 155 }
 156
 157 static int
 158 swconfig_apply_config(struct switch_dev *dev, const struct switch_attr *attr,
 159                         struct switch_val *val)
 160 {
 161         /* don't complain if not supported by the switch driver */
 162         if (!dev->ops->apply_config)
 163                 return 0;
 164
 165         return dev->ops->apply_config(dev);
 166 }
 167
 168 static int
 169 swconfig_reset_switch(struct switch_dev *dev, const struct switch_attr *attr,
 170                         struct switch_val *val)
 171 {
 172         /* don't complain if not supported by the switch driver */
 173         if (!dev->ops->reset_switch)
 174                 return 0;
 175
 176         return dev->ops->reset_switch(dev);
 177 }
 178
 179 enum global_defaults {
 180         GLOBAL_APPLY,
 181         GLOBAL_RESET,
 182 };
 183
 184 enum vlan_defaults {
 185         VLAN_PORTS,
 186 };
 187
 188 enum port_defaults {
 189         PORT_PVID,
 190         PORT_LINK,
 191 };
 192
 193 static struct switch_attr default_global[] = {
 194         [GLOBAL_APPLY] = {
 195                 .type = SWITCH_TYPE_NOVAL,
 196                 .name = "apply",
 197                 .description = "Activate changes in the hardware",
 198                 .set = swconfig_apply_config,
 199         },
 200         [GLOBAL_RESET] = {
 201                 .type = SWITCH_TYPE_NOVAL,
 202                 .name = "reset",
 203                 .description = "Reset the switch",
 204                 .set = swconfig_reset_switch,
 205         }
 206 };
 207
 208 static struct switch_attr default_port[] = {
 209         [PORT_PVID] = {
 210                 .type = SWITCH_TYPE_INT,
 211                 .name = "pvid",
 212                 .description = "Primary VLAN ID",
 213                 .set = swconfig_set_pvid,
 214                 .get = swconfig_get_pvid,
 215         },
 216         [PORT_LINK] = {
 217                 .type = SWITCH_TYPE_LINK,
 218                 .name = "link",
 219                 .description = "Get port link information",
 220                 .set = swconfig_set_link,
 221                 .get = swconfig_get_link,
 222         }
 223 };
 224
 225 static struct switch_attr default_vlan[] = {
 226         [VLAN_PORTS] = {
 227                 .type = SWITCH_TYPE_PORTS,
 228                 .name = "ports",
 229                 .description = "VLAN port mapping",
 230                 .set = swconfig_set_vlan_ports,
 231                 .get = swconfig_get_vlan_ports,
 232         },
 233 };
 234
 235 static const struct switch_attr *
 236 swconfig_find_attr_by_name(const struct switch_attrlist *alist,
 237                                 const char *name)
 238 {
 239         int i;
 240
 241         for (i = 0; i < alist->n_attr; i++)
 242                 if (strcmp(name, alist->attr[i].name) == 0)
 243                         return &alist->attr[i];
 244
 245         return NULL;
 246 }
 247
 248 static void swconfig_defaults_init(struct switch_dev *dev)
 249 {
 250         const struct switch_dev_ops *ops = dev->ops;
 251
 252         dev->def_global = 0;
 253         dev->def_vlan = 0;
 254         dev->def_port = 0;
 255
 256         if (ops->get_vlan_ports || ops->set_vlan_ports)
 257                 set_bit(VLAN_PORTS, &dev->def_vlan);
 258
 259         if (ops->get_port_pvid || ops->set_port_pvid)
 260                 set_bit(PORT_PVID, &dev->def_port);
 261
 262         if (ops->get_port_link &&
 263             !swconfig_find_attr_by_name(&ops->attr_port, "link"))
 264                 set_bit(PORT_LINK, &dev->def_port);
 265
 266         /* always present, can be no-op */
 267         set_bit(GLOBAL_APPLY, &dev->def_global);
 268         set_bit(GLOBAL_RESET, &dev->def_global);
 269 }
 270
 271
 272 static struct genl_family switch_fam;
 273
 274 static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
 275         [SWITCH_ATTR_ID] = { .type = NLA_U32 },
 276         [SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
 277         [SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
 278         [SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
 279         [SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
 280         [SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
 281         [SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
 282         [SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
 283 };
 284
 285 static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
 286         [SWITCH_PORT_ID] = { .type = NLA_U32 },
 287         [SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
 288 };
 289
 290 static struct nla_policy link_policy[SWITCH_LINK_ATTR_MAX] = {
 291         [SWITCH_LINK_FLAG_DUPLEX] = { .type = NLA_FLAG },
 292         [SWITCH_LINK_FLAG_ANEG] = { .type = NLA_FLAG },
 293         [SWITCH_LINK_SPEED] = { .type = NLA_U32 },
 294 };
 295
 296 static inline void
 297 swconfig_lock(void)
 298 {
 299         mutex_lock(&swdevs_lock);
 300 }
 301
 302 static inline void
 303 swconfig_unlock(void)
 304 {
 305         mutex_unlock(&swdevs_lock);
 306 }
 307
 308 static struct switch_dev *
 309 swconfig_get_dev(struct genl_info *info)
 310 {
 311         struct switch_dev *dev = NULL;
 312         struct switch_dev *p;
 313         int id;
 314
 315         if (!info->attrs[SWITCH_ATTR_ID])
 316                 goto done;
 317
 318         id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
 319         swconfig_lock();
 320         list_for_each_entry(p, &swdevs, dev_list) {
 321                 if (id != p->id)
 322                         continue;
 323
 324                 dev = p;
 325                 break;
 326         }
 327         if (dev)
 328                 mutex_lock(&dev->sw_mutex);
 329         else
 330                 pr_debug("device %d not found\n", id);
 331         swconfig_unlock();
 332 done:
 333         return dev;
 334 }
 335
 336 static inline void
 337 swconfig_put_dev(struct switch_dev *dev)
 338 {
 339         mutex_unlock(&dev->sw_mutex);
 340 }
 341
 342 static int
 343 swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
 344 {
 345         struct switch_attr *op = arg;
 346         struct genl_info *info = cb->info;
 347         struct sk_buff *msg = cb->msg;
 348         int id = cb->args[0];
 349         void *hdr;
 350
 351         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 352                         NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
 353         if (IS_ERR(hdr))
 354                 return -1;
 355
 356         if (nla_put_u32(msg, SWITCH_ATTR_OP_ID, id))
 357                 goto nla_put_failure;
 358         if (nla_put_u32(msg, SWITCH_ATTR_OP_TYPE, op->type))
 359                 goto nla_put_failure;
 360         if (nla_put_string(msg, SWITCH_ATTR_OP_NAME, op->name))
 361                 goto nla_put_failure;
 362         if (op->description)
 363                 if (nla_put_string(msg, SWITCH_ATTR_OP_DESCRIPTION,
 364                         op->description))
 365                         goto nla_put_failure;
 366
 367         genlmsg_end(msg, hdr);
 368         return msg->len;
 369 nla_put_failure:
 370         genlmsg_cancel(msg, hdr);
 371         return -EMSGSIZE;
 372 }
 373
 374 /* spread multipart messages across multiple message buffers */
 375 static int
 376 swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
 377 {
 378         struct genl_info *info = cb->info;
 379         int restart = 0;
 380         int err;
 381
 382         do {
 383                 if (!cb->msg) {
 384                         cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 385                         if (cb->msg == NULL)
 386                                 goto error;
 387                 }
 388
 389                 if (!(cb->fill(cb, arg) < 0))
 390                         break;
 391
 392                 /* fill failed, check if this was already the second attempt */
 393                 if (restart)
 394                         goto error;
 395
 396                 /* try again in a new message, send the current one */
 397                 restart = 1;
 398                 if (cb->close) {
 399                         if (cb->close(cb, arg) < 0)
 400                                 goto error;
 401                 }
 402                 err = genlmsg_reply(cb->msg, info);
 403                 cb->msg = NULL;
 404                 if (err < 0)
 405                         goto error;
 406
 407         } while (restart);
 408
 409         return 0;
 410
 411 error:
 412         if (cb->msg)
 413                 nlmsg_free(cb->msg);
 414         return -1;
 415 }
 416
 417 static int
 418 swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
 419 {
 420         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 421         const struct switch_attrlist *alist;
 422         struct switch_dev *dev;
 423         struct swconfig_callback cb;
 424         int err = -EINVAL;
 425         int i;
 426
 427         /* defaults */
 428         struct switch_attr *def_list;
 429         unsigned long *def_active;
 430         int n_def;
 431
 432         dev = swconfig_get_dev(info);
 433         if (!dev)
 434                 return -EINVAL;
 435
 436         switch (hdr->cmd) {
 437         case SWITCH_CMD_LIST_GLOBAL:
 438                 alist = &dev->ops->attr_global;
 439                 def_list = default_global;
 440                 def_active = &dev->def_global;
 441                 n_def = ARRAY_SIZE(default_global);
 442                 break;
 443         case SWITCH_CMD_LIST_VLAN:
 444                 alist = &dev->ops->attr_vlan;
 445                 def_list = default_vlan;
 446                 def_active = &dev->def_vlan;
 447                 n_def = ARRAY_SIZE(default_vlan);
 448                 break;
 449         case SWITCH_CMD_LIST_PORT:
 450                 alist = &dev->ops->attr_port;
 451                 def_list = default_port;
 452                 def_active = &dev->def_port;
 453                 n_def = ARRAY_SIZE(default_port);
 454                 break;
 455         default:
 456                 WARN_ON(1);
 457                 goto out;
 458         }
 459
 460         memset(&cb, 0, sizeof(cb));
 461         cb.info = info;
 462         cb.fill = swconfig_dump_attr;
 463         for (i = 0; i < alist->n_attr; i++) {
 464                 if (alist->attr[i].disabled)
 465                         continue;
 466                 cb.args[0] = i;
 467                 err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
 468                 if (err < 0)
 469                         goto error;
 470         }
 471
 472         /* defaults */
 473         for (i = 0; i < n_def; i++) {
 474                 if (!test_bit(i, def_active))
 475                         continue;
 476                 cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
 477                 err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
 478                 if (err < 0)
 479                         goto error;
 480         }
 481         swconfig_put_dev(dev);
 482
 483         if (!cb.msg)
 484                 return 0;
 485
 486         return genlmsg_reply(cb.msg, info);
 487
 488 error:
 489         if (cb.msg)
 490                 nlmsg_free(cb.msg);
 491 out:
 492         swconfig_put_dev(dev);
 493         return err;
 494 }
 495
 496 static const struct switch_attr *
 497 swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
 498                 struct switch_val *val)
 499 {
 500         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 501         const struct switch_attrlist *alist;
 502         const struct switch_attr *attr = NULL;
 503         unsigned int attr_id;
 504
 505         /* defaults */
 506         struct switch_attr *def_list;
 507         unsigned long *def_active;
 508         int n_def;
 509
 510         if (!info->attrs[SWITCH_ATTR_OP_ID])
 511                 goto done;
 512
 513         switch (hdr->cmd) {
 514         case SWITCH_CMD_SET_GLOBAL:
 515         case SWITCH_CMD_GET_GLOBAL:
 516                 alist = &dev->ops->attr_global;
 517                 def_list = default_global;
 518                 def_active = &dev->def_global;
 519                 n_def = ARRAY_SIZE(default_global);
 520                 break;
 521         case SWITCH_CMD_SET_VLAN:
 522         case SWITCH_CMD_GET_VLAN:
 523                 alist = &dev->ops->attr_vlan;
 524                 def_list = default_vlan;
 525                 def_active = &dev->def_vlan;
 526                 n_def = ARRAY_SIZE(default_vlan);
 527                 if (!info->attrs[SWITCH_ATTR_OP_VLAN])
 528                         goto done;
 529                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
 530                 if (val->port_vlan >= dev->vlans)
 531                         goto done;
 532                 break;
 533         case SWITCH_CMD_SET_PORT:
 534         case SWITCH_CMD_GET_PORT:
 535                 alist = &dev->ops->attr_port;
 536                 def_list = default_port;
 537                 def_active = &dev->def_port;
 538                 n_def = ARRAY_SIZE(default_port);
 539                 if (!info->attrs[SWITCH_ATTR_OP_PORT])
 540                         goto done;
 541                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
 542                 if (val->port_vlan >= dev->ports)
 543                         goto done;
 544                 break;
 545         default:
 546                 WARN_ON(1);
 547                 goto done;
 548         }
 549
 550         if (!alist)
 551                 goto done;
 552
 553         attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
 554         if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
 555                 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
 556                 if (attr_id >= n_def)
 557                         goto done;
 558                 if (!test_bit(attr_id, def_active))
 559                         goto done;
 560                 attr = &def_list[attr_id];
 561         } else {
 562                 if (attr_id >= alist->n_attr)
 563                         goto done;
 564                 attr = &alist->attr[attr_id];
 565         }
 566
 567         if (attr->disabled)
 568                 attr = NULL;
 569
 570 done:
 571         if (!attr)
 572                 pr_debug("attribute lookup failed\n");
 573         val->attr = attr;
 574         return attr;
 575 }
 576
 577 static int
 578 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 579                 struct switch_val *val, int max)
 580 {
 581         struct nlattr *nla;
 582         int rem;
 583
 584         val->len = 0;
 585         nla_for_each_nested(nla, head, rem) {
 586                 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
 587                 struct switch_port *port;
 588
 589                 if (val->len >= max)
 590                         return -EINVAL;
 591
 592                 port = &val->value.ports[val->len];
 593
 594 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 595                 if (nla_parse_nested_deprecated(tb, SWITCH_PORT_ATTR_MAX, nla,
 596                                 port_policy, NULL))
 597 #else
 598                 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
 599                                 port_policy, NULL))
 600 #endif
 601                         return -EINVAL;
 602
 603                 if (!tb[SWITCH_PORT_ID])
 604                         return -EINVAL;
 605
 606                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 607                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 608                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 609                 val->len++;
 610         }
 611
 612         return 0;
 613 }
 614
 615 static int
 616 swconfig_parse_link(struct sk_buff *msg, struct nlattr *nla,
 617                     struct switch_port_link *link)
 618 {
 619         struct nlattr *tb[SWITCH_LINK_ATTR_MAX + 1];
 620
 621 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 622         if (nla_parse_nested_deprecated(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy, NULL))
 623 #else
 624         if (nla_parse_nested(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy, NULL))
 625 #endif
 626                 return -EINVAL;
 627
 628         link->duplex = !!tb[SWITCH_LINK_FLAG_DUPLEX];
 629         link->aneg = !!tb[SWITCH_LINK_FLAG_ANEG];
 630         link->speed = nla_get_u32(tb[SWITCH_LINK_SPEED]);
 631
 632         return 0;
 633 }
 634
 635 static int
 636 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 637 {
 638         const struct switch_attr *attr;
 639         struct switch_dev *dev;
 640         struct switch_val val;
 641         int err = -EINVAL;
 642
 643         if (!capable(CAP_NET_ADMIN))
 644                 return -EPERM;
 645
 646         dev = swconfig_get_dev(info);
 647         if (!dev)
 648                 return -EINVAL;
 649
 650         memset(&val, 0, sizeof(val));
 651         attr = swconfig_lookup_attr(dev, info, &val);
 652         if (!attr || !attr->set)
 653                 goto error;
 654
 655         val.attr = attr;
 656         switch (attr->type) {
 657         case SWITCH_TYPE_NOVAL:
 658                 break;
 659         case SWITCH_TYPE_INT:
 660                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
 661                         goto error;
 662                 val.value.i =
 663                         nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
 664                 break;
 665         case SWITCH_TYPE_STRING:
 666                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
 667                         goto error;
 668                 val.value.s =
 669                         nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
 670                 break;
 671         case SWITCH_TYPE_PORTS:
 672                 val.value.ports = dev->portbuf;
 673                 memset(dev->portbuf, 0,
 674                         sizeof(struct switch_port) * dev->ports);
 675
 676                 /* TODO: implement multipart? */
 677                 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
 678                         err = swconfig_parse_ports(skb,
 679                                 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS],
 680                                 &val, dev->ports);
 681                         if (err < 0)
 682                                 goto error;
 683                 } else {
 684                         val.len = 0;
 685                         err = 0;
 686                 }
 687                 break;
 688         case SWITCH_TYPE_LINK:
 689                 val.value.link = &dev->linkbuf;
 690                 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 691
 692                 if (info->attrs[SWITCH_ATTR_OP_VALUE_LINK]) {
 693                         err = swconfig_parse_link(skb,
 694                                                   info->attrs[SWITCH_ATTR_OP_VALUE_LINK],
 695                                                   val.value.link);
 696                         if (err < 0)
 697                                 goto error;
 698                 } else {
 699                         val.len = 0;
 700                         err = 0;
 701                 }
 702                 break;
 703         default:
 704                 goto error;
 705         }
 706
 707         err = attr->set(dev, attr, &val);
 708 error:
 709         swconfig_put_dev(dev);
 710         return err;
 711 }
 712
 713 static int
 714 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
 715 {
 716         if (cb->nest[0])
 717                 nla_nest_end(cb->msg, cb->nest[0]);
 718         return 0;
 719 }
 720
 721 static int
 722 swconfig_send_port(struct swconfig_callback *cb, void *arg)
 723 {
 724         const struct switch_port *port = arg;
 725         struct nlattr *p = NULL;
 726
 727         if (!cb->nest[0]) {
 728                 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
 729                 if (!cb->nest[0])
 730                         return -1;
 731         }
 732
 733         p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
 734         if (!p)
 735                 goto error;
 736
 737         if (nla_put_u32(cb->msg, SWITCH_PORT_ID, port->id))
 738                 goto nla_put_failure;
 739         if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
 740                 if (nla_put_flag(cb->msg, SWITCH_PORT_FLAG_TAGGED))
 741                         goto nla_put_failure;
 742         }
 743
 744         nla_nest_end(cb->msg, p);
 745         return 0;
 746
 747 nla_put_failure:
 748                 nla_nest_cancel(cb->msg, p);
 749 error:
 750         nla_nest_cancel(cb->msg, cb->nest[0]);
 751         return -1;
 752 }
 753
 754 static int
 755 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
 756                 const struct switch_val *val)
 757 {
 758         struct swconfig_callback cb;
 759         int err = 0;
 760         int i;
 761
 762         if (!val->value.ports)
 763                 return -EINVAL;
 764
 765         memset(&cb, 0, sizeof(cb));
 766         cb.cmd = attr;
 767         cb.msg = *msg;
 768         cb.info = info;
 769         cb.fill = swconfig_send_port;
 770         cb.close = swconfig_close_portlist;
 771
 772         cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
 773         for (i = 0; i < val->len; i++) {
 774                 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
 775                 if (err)
 776                         goto done;
 777         }
 778         err = val->len;
 779         swconfig_close_portlist(&cb, NULL);
 780         *msg = cb.msg;
 781
 782 done:
 783         return err;
 784 }
 785
 786 static int
 787 swconfig_send_link(struct sk_buff *msg, struct genl_info *info, int attr,
 788                    const struct switch_port_link *link)
 789 {
 790         struct nlattr *p = NULL;
 791         int err = 0;
 792
 793         p = nla_nest_start(msg, attr);
 794         if (link->link) {
 795                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_LINK))
 796                         goto nla_put_failure;
 797         }
 798         if (link->duplex) {
 799                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_DUPLEX))
 800                         goto nla_put_failure;
 801         }
 802         if (link->aneg) {
 803                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_ANEG))
 804                         goto nla_put_failure;
 805         }
 806         if (link->tx_flow) {
 807                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_TX_FLOW))
 808                         goto nla_put_failure;
 809         }
 810         if (link->rx_flow) {
 811                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_RX_FLOW))
 812                         goto nla_put_failure;
 813         }
 814         if (nla_put_u32(msg, SWITCH_LINK_SPEED, link->speed))
 815                 goto nla_put_failure;
 816         if (link->eee & ADVERTISED_100baseT_Full) {
 817                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_100BASET))
 818                         goto nla_put_failure;
 819         }
 820         if (link->eee & ADVERTISED_1000baseT_Full) {
 821                 if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_1000BASET))
 822                         goto nla_put_failure;
 823         }
 824         nla_nest_end(msg, p);
 825
 826         return err;
 827
 828 nla_put_failure:
 829         nla_nest_cancel(msg, p);
 830         return -1;
 831 }
 832
 833 static int
 834 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 835 {
 836         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 837         const struct switch_attr *attr;
 838         struct switch_dev *dev;
 839         struct sk_buff *msg = NULL;
 840         struct switch_val val;
 841         int err = -EINVAL;
 842         int cmd = hdr->cmd;
 843
 844         dev = swconfig_get_dev(info);
 845         if (!dev)
 846                 return -EINVAL;
 847
 848         memset(&val, 0, sizeof(val));
 849         attr = swconfig_lookup_attr(dev, info, &val);
 850         if (!attr || !attr->get)
 851                 goto error;
 852
 853         if (attr->type == SWITCH_TYPE_PORTS) {
 854                 val.value.ports = dev->portbuf;
 855                 memset(dev->portbuf, 0,
 856                         sizeof(struct switch_port) * dev->ports);
 857         } else if (attr->type == SWITCH_TYPE_LINK) {
 858                 val.value.link = &dev->linkbuf;
 859                 memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 860         }
 861
 862         err = attr->get(dev, attr, &val);
 863         if (err)
 864                 goto error;
 865
 866         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 867         if (!msg)
 868                 goto error;
 869
 870         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, &switch_fam,
 871                         0, cmd);
 872         if (IS_ERR(hdr))
 873                 goto nla_put_failure;
 874
 875         switch (attr->type) {
 876         case SWITCH_TYPE_INT:
 877                 if (nla_put_u32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i))
 878                         goto nla_put_failure;
 879                 break;
 880         case SWITCH_TYPE_STRING:
 881                 if (nla_put_string(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s))
 882                         goto nla_put_failure;
 883                 break;
 884         case SWITCH_TYPE_PORTS:
 885                 err = swconfig_send_ports(&msg, info,
 886                                 SWITCH_ATTR_OP_VALUE_PORTS, &val);
 887                 if (err < 0)
 888                         goto nla_put_failure;
 889                 break;
 890         case SWITCH_TYPE_LINK:
 891                 err = swconfig_send_link(msg, info,
 892                                          SWITCH_ATTR_OP_VALUE_LINK, val.value.link);
 893                 if (err < 0)
 894                         goto nla_put_failure;
 895                 break;
 896         default:
 897                 pr_debug("invalid type in attribute\n");
 898                 err = -EINVAL;
 899                 goto nla_put_failure;
 900         }
 901         genlmsg_end(msg, hdr);
 902         err = msg->len;
 903         if (err < 0)
 904                 goto nla_put_failure;
 905
 906         swconfig_put_dev(dev);
 907         return genlmsg_reply(msg, info);
 908
 909 nla_put_failure:
 910         if (msg)
 911                 nlmsg_free(msg);
 912 error:
 913         swconfig_put_dev(dev);
 914         if (!err)
 915                 err = -ENOMEM;
 916         return err;
 917 }
 918
 919 static int
 920 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 921                 const struct switch_dev *dev)
 922 {
 923         struct nlattr *p = NULL, *m = NULL;
 924         void *hdr;
 925         int i;
 926
 927         hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
 928                         SWITCH_CMD_NEW_ATTR);
 929         if (IS_ERR(hdr))
 930                 return -1;
 931
 932         if (nla_put_u32(msg, SWITCH_ATTR_ID, dev->id))
 933                 goto nla_put_failure;
 934         if (nla_put_string(msg, SWITCH_ATTR_DEV_NAME, dev->devname))
 935                 goto nla_put_failure;
 936         if (nla_put_string(msg, SWITCH_ATTR_ALIAS, dev->alias))
 937                 goto nla_put_failure;
 938         if (nla_put_string(msg, SWITCH_ATTR_NAME, dev->name))
 939                 goto nla_put_failure;
 940         if (nla_put_u32(msg, SWITCH_ATTR_VLANS, dev->vlans))
 941                 goto nla_put_failure;
 942         if (nla_put_u32(msg, SWITCH_ATTR_PORTS, dev->ports))
 943                 goto nla_put_failure;
 944         if (nla_put_u32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port))
 945                 goto nla_put_failure;
 946
 947         m = nla_nest_start(msg, SWITCH_ATTR_PORTMAP);
 948         if (!m)
 949                 goto nla_put_failure;
 950         for (i = 0; i < dev->ports; i++) {
 951                 p = nla_nest_start(msg, SWITCH_ATTR_PORTS);
 952                 if (!p)
 953                         continue;
 954                 if (dev->portmap[i].s) {
 955                         if (nla_put_string(msg, SWITCH_PORTMAP_SEGMENT,
 956                                                 dev->portmap[i].s))
 957                                 goto nla_put_failure;
 958                         if (nla_put_u32(msg, SWITCH_PORTMAP_VIRT,
 959                                                 dev->portmap[i].virt))
 960                                 goto nla_put_failure;
 961                 }
 962                 nla_nest_end(msg, p);
 963         }
 964         nla_nest_end(msg, m);
 965         genlmsg_end(msg, hdr);
 966         return msg->len;
 967 nla_put_failure:
 968         genlmsg_cancel(msg, hdr);
 969         return -EMSGSIZE;
 970 }
 971
 972 static int swconfig_dump_switches(struct sk_buff *skb,
 973                 struct netlink_callback *cb)
 974 {
 975         struct switch_dev *dev;
 976         int start = cb->args[0];
 977         int idx = 0;
 978
 979         swconfig_lock();
 980         list_for_each_entry(dev, &swdevs, dev_list) {
 981                 if (++idx <= start)
 982                         continue;
 983                 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).portid,
 984                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 985                                 dev) < 0)
 986                         break;
 987         }
 988         swconfig_unlock();
 989         cb->args[0] = idx;
 990
 991         return skb->len;
 992 }
 993
 994 static int
 995 swconfig_done(struct netlink_callback *cb)
 996 {
 997         return 0;
 998 }
 999
1000 static struct genl_ops swconfig_ops[] = {
1001         {
1002                 .cmd = SWITCH_CMD_LIST_GLOBAL,
1003 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1004                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1005 #endif
1006                 .doit = swconfig_list_attrs,
1007 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1008                 .policy = switch_policy,
1009 #endif
1010         },
1011         {
1012                 .cmd = SWITCH_CMD_LIST_VLAN,
1013 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1014                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1015 #endif
1016                 .doit = swconfig_list_attrs,
1017 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1018                 .policy = switch_policy,
1019 #endif
1020         },
1021         {
1022                 .cmd = SWITCH_CMD_LIST_PORT,
1023 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1024                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1025 #endif
1026                 .doit = swconfig_list_attrs,
1027 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1028                 .policy = switch_policy,
1029 #endif
1030         },
1031         {
1032                 .cmd = SWITCH_CMD_GET_GLOBAL,
1033 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1034                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1035 #endif
1036                 .doit = swconfig_get_attr,
1037 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1038                 .policy = switch_policy,
1039 #endif
1040         },
1041         {
1042                 .cmd = SWITCH_CMD_GET_VLAN,
1043 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1044                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1045 #endif
1046                 .doit = swconfig_get_attr,
1047 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1048                 .policy = switch_policy,
1049 #endif
1050         },
1051         {
1052                 .cmd = SWITCH_CMD_GET_PORT,
1053 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1054                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1055 #endif
1056                 .doit = swconfig_get_attr,
1057 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1058                 .policy = switch_policy,
1059 #endif
1060         },
1061         {
1062                 .cmd = SWITCH_CMD_SET_GLOBAL,
1063 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1064                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1065 #endif
1066                 .flags = GENL_ADMIN_PERM,
1067                 .doit = swconfig_set_attr,
1068 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1069                 .policy = switch_policy,
1070 #endif
1071         },
1072         {
1073                 .cmd = SWITCH_CMD_SET_VLAN,
1074 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1075                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1076 #endif
1077                 .flags = GENL_ADMIN_PERM,
1078                 .doit = swconfig_set_attr,
1079 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1080                 .policy = switch_policy,
1081 #endif
1082         },
1083         {
1084                 .cmd = SWITCH_CMD_SET_PORT,
1085 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1086                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1087 #endif
1088                 .flags = GENL_ADMIN_PERM,
1089                 .doit = swconfig_set_attr,
1090 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1091                 .policy = switch_policy,
1092 #endif
1093         },
1094         {
1095                 .cmd = SWITCH_CMD_GET_SWITCH,
1096 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
1097                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1098 #endif
1099                 .dumpit = swconfig_dump_switches,
1100 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
1101                 .policy = switch_policy,
1102 #endif
1103                 .done = swconfig_done,
1104         }
1105 };
1106
1107 static struct genl_family switch_fam = {
1108         .name = "switch",
1109         .hdrsize = 0,
1110         .version = 1,
1111         .maxattr = SWITCH_ATTR_MAX,
1112 #if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
1113         .policy = switch_policy,
1114 #endif
1115         .module = THIS_MODULE,
1116         .ops = swconfig_ops,
1117         .n_ops = ARRAY_SIZE(swconfig_ops),
1118 };
1119
1120 #ifdef CONFIG_OF
1121 void
1122 of_switch_load_portmap(struct switch_dev *dev)
1123 {
1124         struct device_node *port;
1125
1126         if (!dev->of_node)
1127                 return;
1128
1129         for_each_child_of_node(dev->of_node, port) {
1130                 const __be32 *prop;
1131                 const char *segment;
1132                 int size, phys;
1133
1134                 if (!of_device_is_compatible(port, "swconfig,port"))
1135                         continue;
1136
1137                 if (of_property_read_string(port, "swconfig,segment", &segment))
1138                         continue;
1139
1140                 prop = of_get_property(port, "swconfig,portmap", &size);
1141                 if (!prop)
1142                         continue;
1143
1144                 if (size != (2 * sizeof(*prop))) {
1145                         pr_err("%s: failed to parse port mapping\n",
1146                                         port->name);
1147                         continue;
1148                 }
1149
1150                 phys = be32_to_cpup(prop++);
1151                 if ((phys < 0) | (phys >= dev->ports)) {
1152                         pr_err("%s: physical port index out of range\n",
1153                                         port->name);
1154                         continue;
1155                 }
1156
1157                 dev->portmap[phys].s = kstrdup(segment, GFP_KERNEL);
1158                 dev->portmap[phys].virt = be32_to_cpup(prop);
1159                 pr_debug("Found port: %s, physical: %d, virtual: %d\n",
1160                         segment, phys, dev->portmap[phys].virt);
1161         }
1162 }
1163 #endif
1164
1165 int
1166 register_switch(struct switch_dev *dev, struct net_device *netdev)
1167 {
1168         struct switch_dev *sdev;
1169         const int max_switches = 8 * sizeof(unsigned long);
1170         unsigned long in_use = 0;
1171         int err;
1172         int i;
1173
1174         INIT_LIST_HEAD(&dev->dev_list);
1175         if (netdev) {
1176                 dev->netdev = netdev;
1177                 if (!dev->alias)
1178                         dev->alias = netdev->name;
1179         }
1180         BUG_ON(!dev->alias);
1181
1182         /* Make sure swdev_id doesn't overflow */
1183         if (swdev_id == INT_MAX) {
1184                 return -ENOMEM;
1185         }
1186
1187         if (dev->ports > 0) {
1188                 dev->portbuf = kzalloc(sizeof(struct switch_port) *
1189                                 dev->ports, GFP_KERNEL);
1190                 if (!dev->portbuf)
1191                         return -ENOMEM;
1192                 dev->portmap = kzalloc(sizeof(struct switch_portmap) *
1193                                 dev->ports, GFP_KERNEL);
1194                 if (!dev->portmap) {
1195                         kfree(dev->portbuf);
1196                         return -ENOMEM;
1197                 }
1198         }
1199         swconfig_defaults_init(dev);
1200         mutex_init(&dev->sw_mutex);
1201         swconfig_lock();
1202         dev->id = ++swdev_id;
1203
1204         list_for_each_entry(sdev, &swdevs, dev_list) {
1205                 if (!sscanf(sdev->devname, SWCONFIG_DEVNAME, &i))
1206                         continue;
1207                 if (i < 0 || i > max_switches)
1208                         continue;
1209
1210                 set_bit(i, &in_use);
1211         }
1212         i = find_first_zero_bit(&in_use, max_switches);
1213
1214         if (i == max_switches) {
1215                 swconfig_unlock();
1216                 return -ENFILE;
1217         }
1218
1219 #ifdef CONFIG_OF
1220         if (dev->ports)
1221                 of_switch_load_portmap(dev);
1222 #endif
1223
1224         /* fill device name */
1225         snprintf(dev->devname, IFNAMSIZ, SWCONFIG_DEVNAME, i);
1226
1227         list_add_tail(&dev->dev_list, &swdevs);
1228         swconfig_unlock();
1229
1230         err = swconfig_create_led_trigger(dev);
1231         if (err)
1232                 return err;
1233
1234         return 0;
1235 }
1236 EXPORT_SYMBOL_GPL(register_switch);
1237
1238 void
1239 unregister_switch(struct switch_dev *dev)
1240 {
1241         swconfig_destroy_led_trigger(dev);
1242         kfree(dev->portbuf);
1243         mutex_lock(&dev->sw_mutex);
1244         swconfig_lock();
1245         list_del(&dev->dev_list);
1246         swconfig_unlock();
1247         mutex_unlock(&dev->sw_mutex);
1248 }
1249 EXPORT_SYMBOL_GPL(unregister_switch);
1250
1251 int
1252 switch_generic_set_link(struct switch_dev *dev, int port,
1253                         struct switch_port_link *link)
1254 {
1255         if (WARN_ON(!dev->ops->phy_write16))
1256                 return -ENOTSUPP;
1257
1258         /* Generic implementation */
1259         if (link->aneg) {
1260                 dev->ops->phy_write16(dev, port, MII_BMCR, 0x0000);
1261                 dev->ops->phy_write16(dev, port, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
1262         } else {
1263                 u16 bmcr = 0;
1264
1265                 if (link->duplex)
1266                         bmcr |= BMCR_FULLDPLX;
1267
1268                 switch (link->speed) {
1269                 case SWITCH_PORT_SPEED_10:
1270                         break;
1271                 case SWITCH_PORT_SPEED_100:
1272                         bmcr |= BMCR_SPEED100;
1273                         break;
1274                 case SWITCH_PORT_SPEED_1000:
1275                         bmcr |= BMCR_SPEED1000;
1276                         break;
1277                 default:
1278                         return -ENOTSUPP;
1279                 }
1280
1281                 dev->ops->phy_write16(dev, port, MII_BMCR, bmcr);
1282         }
1283
1284         return 0;
1285 }
1286 EXPORT_SYMBOL_GPL(switch_generic_set_link);
1287
1288 static int __init
1289 swconfig_init(void)
1290 {
1291         INIT_LIST_HEAD(&swdevs);
1292
1293         return genl_register_family(&switch_fam);
1294 }
1295
1296 static void __exit
1297 swconfig_exit(void)
1298 {
1299         genl_unregister_family(&switch_fam);
1300 }
1301
1302 module_init(swconfig_init);
1303 module_exit(swconfig_exit);