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   1 /*
   2  * Copyright (c) 2008, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Author: Lucy Liu <lucy.liu@intel.com>
  18  */
  19
  20 #include <linux/netdevice.h>
  21 #include <linux/netlink.h>
  22 #include <net/netlink.h>
  23 #include <net/rtnetlink.h>
  24 #include <linux/dcbnl.h>
  25 #include <linux/rtnetlink.h>
  26 #include <net/sock.h>
  27
  28 /**
  29  * Data Center Bridging (DCB) is a collection of Ethernet enhancements
  30  * intended to allow network traffic with differing requirements
  31  * (highly reliable, no drops vs. best effort vs. low latency) to operate
  32  * and co-exist on Ethernet.  Current DCB features are:
  33  *
  34  * Enhanced Transmission Selection (aka Priority Grouping [PG]) - provides a
  35  *   framework for assigning bandwidth guarantees to traffic classes.
  36  *
  37  * Priority-based Flow Control (PFC) - provides a flow control mechanism which
  38  *   can work independently for each 802.1p priority.
  39  *
  40  * Congestion Notification - provides a mechanism for end-to-end congestion
  41  *   control for protocols which do not have built-in congestion management.
  42  *
  43  * More information about the emerging standards for these Ethernet features
  44  * can be found at: http://www.ieee802.org/1/pages/dcbridges.html
  45  *
  46  * This file implements an rtnetlink interface to allow configuration of DCB
  47  * features for capable devices.
  48  */
  49
  50 MODULE_AUTHOR("Lucy Liu, <lucy.liu@intel.com>");
  51 MODULE_DESCRIPTION("Data Center Bridging generic netlink interface");
  52 MODULE_LICENSE("GPL");
  53
  54 /**************** DCB attribute policies *************************************/
  55
  56 /* DCB netlink attributes policy */
  57 static struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {
  58         [DCB_ATTR_IFNAME]    = {.type = NLA_STRING, .len = IFNAMSIZ - 1},
  59         [DCB_ATTR_STATE]     = {.type = NLA_U8},
  60         [DCB_ATTR_PFC_CFG]   = {.type = NLA_NESTED},
  61         [DCB_ATTR_PG_CFG]    = {.type = NLA_NESTED},
  62         [DCB_ATTR_SET_ALL]   = {.type = NLA_U8},
  63         [DCB_ATTR_PERM_HWADDR] = {.type = NLA_FLAG},
  64 };
  65
  66 /* DCB priority flow control to User Priority nested attributes */
  67 static struct nla_policy dcbnl_pfc_up_nest[DCB_PFC_UP_ATTR_MAX + 1] = {
  68         [DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},
  69         [DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},
  70         [DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},
  71         [DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},
  72         [DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},
  73         [DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},
  74         [DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},
  75         [DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},
  76         [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},
  77 };
  78
  79 /* DCB priority grouping nested attributes */
  80 static struct nla_policy dcbnl_pg_nest[DCB_PG_ATTR_MAX + 1] = {
  81         [DCB_PG_ATTR_TC_0]      = {.type = NLA_NESTED},
  82         [DCB_PG_ATTR_TC_1]      = {.type = NLA_NESTED},
  83         [DCB_PG_ATTR_TC_2]      = {.type = NLA_NESTED},
  84         [DCB_PG_ATTR_TC_3]      = {.type = NLA_NESTED},
  85         [DCB_PG_ATTR_TC_4]      = {.type = NLA_NESTED},
  86         [DCB_PG_ATTR_TC_5]      = {.type = NLA_NESTED},
  87         [DCB_PG_ATTR_TC_6]      = {.type = NLA_NESTED},
  88         [DCB_PG_ATTR_TC_7]      = {.type = NLA_NESTED},
  89         [DCB_PG_ATTR_TC_ALL]    = {.type = NLA_NESTED},
  90         [DCB_PG_ATTR_BW_ID_0]   = {.type = NLA_U8},
  91         [DCB_PG_ATTR_BW_ID_1]   = {.type = NLA_U8},
  92         [DCB_PG_ATTR_BW_ID_2]   = {.type = NLA_U8},
  93         [DCB_PG_ATTR_BW_ID_3]   = {.type = NLA_U8},
  94         [DCB_PG_ATTR_BW_ID_4]   = {.type = NLA_U8},
  95         [DCB_PG_ATTR_BW_ID_5]   = {.type = NLA_U8},
  96         [DCB_PG_ATTR_BW_ID_6]   = {.type = NLA_U8},
  97         [DCB_PG_ATTR_BW_ID_7]   = {.type = NLA_U8},
  98         [DCB_PG_ATTR_BW_ID_ALL] = {.type = NLA_FLAG},
  99 };
 100
 101 /* DCB traffic class nested attributes. */
 102 static struct nla_policy dcbnl_tc_param_nest[DCB_TC_ATTR_PARAM_MAX + 1] = {
 103         [DCB_TC_ATTR_PARAM_PGID]            = {.type = NLA_U8},
 104         [DCB_TC_ATTR_PARAM_UP_MAPPING]      = {.type = NLA_U8},
 105         [DCB_TC_ATTR_PARAM_STRICT_PRIO]     = {.type = NLA_U8},
 106         [DCB_TC_ATTR_PARAM_BW_PCT]          = {.type = NLA_U8},
 107         [DCB_TC_ATTR_PARAM_ALL]             = {.type = NLA_FLAG},
 108 };
 109
 110
 111 /* standard netlink reply call */
 112 static int dcbnl_reply(u8 value, u8 event, u8 cmd, u8 attr, u32 pid,
 113                        u32 seq, u16 flags)
 114 {
 115         struct sk_buff *dcbnl_skb;
 116         struct dcbmsg *dcb;
 117         struct nlmsghdr *nlh;
 118         int ret = -EINVAL;
 119
 120         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 121         if (!dcbnl_skb)
 122                 return ret;
 123
 124         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, event, sizeof(*dcb), flags);
 125
 126         dcb = NLMSG_DATA(nlh);
 127         dcb->dcb_family = AF_UNSPEC;
 128         dcb->cmd = cmd;
 129         dcb->dcb_pad = 0;
 130
 131         ret = nla_put_u8(dcbnl_skb, attr, value);
 132         if (ret)
 133                 goto err;
 134
 135         /* end the message, assign the nlmsg_len. */
 136         nlmsg_end(dcbnl_skb, nlh);
 137         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 138         if (ret)
 139                 goto err;
 140
 141         return 0;
 142 nlmsg_failure:
 143 err:
 144         kfree(dcbnl_skb);
 145         return ret;
 146 }
 147
 148 static int dcbnl_getstate(struct net_device *netdev, struct nlattr **tb,
 149                           u32 pid, u32 seq, u16 flags)
 150 {
 151         int ret = -EINVAL;
 152
 153         /* if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->getstate) */
 154         if (!netdev->dcbnl_ops->getstate)
 155                 return ret;
 156
 157         ret = dcbnl_reply(netdev->dcbnl_ops->getstate(netdev), RTM_GETDCB,
 158                           DCB_CMD_GSTATE, DCB_ATTR_STATE, pid, seq, flags);
 159
 160         return ret;
 161 }
 162
 163 static int dcbnl_getpfccfg(struct net_device *netdev, struct nlattr **tb,
 164                            u32 pid, u32 seq, u16 flags)
 165 {
 166         struct sk_buff *dcbnl_skb;
 167         struct nlmsghdr *nlh;
 168         struct dcbmsg *dcb;
 169         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1], *nest;
 170         u8 value;
 171         int ret = -EINVAL;
 172         int i;
 173         int getall = 0;
 174
 175         if (!tb[DCB_ATTR_PFC_CFG] || !netdev->dcbnl_ops->getpfccfg)
 176                 return ret;
 177
 178         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
 179                                tb[DCB_ATTR_PFC_CFG],
 180                                dcbnl_pfc_up_nest);
 181         if (ret)
 182                 goto err_out;
 183
 184         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 185         if (!dcbnl_skb)
 186                 goto err_out;
 187
 188         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 189
 190         dcb = NLMSG_DATA(nlh);
 191         dcb->dcb_family = AF_UNSPEC;
 192         dcb->cmd = DCB_CMD_PFC_GCFG;
 193
 194         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_PFC_CFG);
 195         if (!nest)
 196                 goto err;
 197
 198         if (data[DCB_PFC_UP_ATTR_ALL])
 199                 getall = 1;
 200
 201         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 202                 if (!getall && !data[i])
 203                         continue;
 204
 205                 netdev->dcbnl_ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0,
 206                                              &value);
 207                 ret = nla_put_u8(dcbnl_skb, i, value);
 208
 209                 if (ret) {
 210                         nla_nest_cancel(dcbnl_skb, nest);
 211                         goto err;
 212                 }
 213         }
 214         nla_nest_end(dcbnl_skb, nest);
 215
 216         nlmsg_end(dcbnl_skb, nlh);
 217
 218         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 219         if (ret)
 220                 goto err;
 221
 222         return 0;
 223 nlmsg_failure:
 224 err:
 225         kfree(dcbnl_skb);
 226 err_out:
 227         return -EINVAL;
 228 }
 229
 230 static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlattr **tb,
 231                                 u32 pid, u32 seq, u16 flags)
 232 {
 233         struct sk_buff *dcbnl_skb;
 234         struct nlmsghdr *nlh;
 235         struct dcbmsg *dcb;
 236         u8 perm_addr[MAX_ADDR_LEN];
 237         int ret = -EINVAL;
 238
 239         if (!netdev->dcbnl_ops->getpermhwaddr)
 240                 return ret;
 241
 242         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 243         if (!dcbnl_skb)
 244                 goto err_out;
 245
 246         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 247
 248         dcb = NLMSG_DATA(nlh);
 249         dcb->dcb_family = AF_UNSPEC;
 250         dcb->cmd = DCB_CMD_GPERM_HWADDR;
 251
 252         netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);
 253
 254         ret = nla_put(dcbnl_skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr),
 255                       perm_addr);
 256
 257         nlmsg_end(dcbnl_skb, nlh);
 258
 259         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 260         if (ret)
 261                 goto err;
 262
 263         return 0;
 264
 265 nlmsg_failure:
 266 err:
 267         kfree(dcbnl_skb);
 268 err_out:
 269         return -EINVAL;
 270 }
 271
 272 static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlattr **tb,
 273                              u32 pid, u32 seq, u16 flags, int dir)
 274 {
 275         struct sk_buff *dcbnl_skb;
 276         struct nlmsghdr *nlh;
 277         struct dcbmsg *dcb;
 278         struct nlattr *pg_nest, *param_nest, *data;
 279         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 280         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 281         u8 prio, pgid, tc_pct, up_map;
 282         int ret  = -EINVAL;
 283         int getall = 0;
 284         int i;
 285
 286         if (!tb[DCB_ATTR_PG_CFG] ||
 287             !netdev->dcbnl_ops->getpgtccfgtx ||
 288             !netdev->dcbnl_ops->getpgtccfgrx ||
 289             !netdev->dcbnl_ops->getpgbwgcfgtx ||
 290             !netdev->dcbnl_ops->getpgbwgcfgrx)
 291                 return ret;
 292
 293         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
 294                                tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
 295
 296         if (ret)
 297                 goto err_out;
 298
 299         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 300         if (!dcbnl_skb)
 301                 goto err_out;
 302
 303         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 304
 305         dcb = NLMSG_DATA(nlh);
 306         dcb->dcb_family = AF_UNSPEC;
 307         dcb->cmd = (dir) ? DCB_CMD_PGRX_GCFG : DCB_CMD_PGTX_GCFG;
 308
 309         pg_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_PG_CFG);
 310         if (!pg_nest)
 311                 goto err;
 312
 313         if (pg_tb[DCB_PG_ATTR_TC_ALL])
 314                 getall = 1;
 315
 316         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 317                 if (!getall && !pg_tb[i])
 318                         continue;
 319
 320                 if (pg_tb[DCB_PG_ATTR_TC_ALL])
 321                         data = pg_tb[DCB_PG_ATTR_TC_ALL];
 322                 else
 323                         data = pg_tb[i];
 324                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
 325                                        data, dcbnl_tc_param_nest);
 326                 if (ret)
 327                         goto err_pg;
 328
 329                 param_nest = nla_nest_start(dcbnl_skb, i);
 330                 if (!param_nest)
 331                         goto err_pg;
 332
 333                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 334                 prio = DCB_ATTR_VALUE_UNDEFINED;
 335                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 336                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 337
 338                 if (dir) {
 339                         /* Rx */
 340                         netdev->dcbnl_ops->getpgtccfgrx(netdev,
 341                                                 i - DCB_PG_ATTR_TC_0, &prio,
 342                                                 &pgid, &tc_pct, &up_map);
 343                 } else {
 344                         /* Tx */
 345                         netdev->dcbnl_ops->getpgtccfgtx(netdev,
 346                                                 i - DCB_PG_ATTR_TC_0, &prio,
 347                                                 &pgid, &tc_pct, &up_map);
 348                 }
 349
 350                 if (param_tb[DCB_TC_ATTR_PARAM_PGID] ||
 351                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 352                         ret = nla_put_u8(dcbnl_skb,
 353                                          DCB_TC_ATTR_PARAM_PGID, pgid);
 354                         if (ret)
 355                                 goto err_param;
 356                 }
 357                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING] ||
 358                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 359                         ret = nla_put_u8(dcbnl_skb,
 360                                          DCB_TC_ATTR_PARAM_UP_MAPPING, up_map);
 361                         if (ret)
 362                                 goto err_param;
 363                 }
 364                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO] ||
 365                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 366                         ret = nla_put_u8(dcbnl_skb,
 367                                          DCB_TC_ATTR_PARAM_STRICT_PRIO, prio);
 368                         if (ret)
 369                                 goto err_param;
 370                 }
 371                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT] ||
 372                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 373                         ret = nla_put_u8(dcbnl_skb, DCB_TC_ATTR_PARAM_BW_PCT,
 374                                          tc_pct);
 375                         if (ret)
 376                                 goto err_param;
 377                 }
 378                 nla_nest_end(dcbnl_skb, param_nest);
 379         }
 380
 381         if (pg_tb[DCB_PG_ATTR_BW_ID_ALL])
 382                 getall = 1;
 383         else
 384                 getall = 0;
 385
 386         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 387                 if (!getall && !pg_tb[i])
 388                         continue;
 389
 390                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 391
 392                 if (dir) {
 393                         /* Rx */
 394                         netdev->dcbnl_ops->getpgbwgcfgrx(netdev,
 395                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 396                 } else {
 397                         /* Tx */
 398                         netdev->dcbnl_ops->getpgbwgcfgtx(netdev,
 399                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 400                 }
 401                 ret = nla_put_u8(dcbnl_skb, i, tc_pct);
 402
 403                 if (ret)
 404                         goto err_pg;
 405         }
 406
 407         nla_nest_end(dcbnl_skb, pg_nest);
 408
 409         nlmsg_end(dcbnl_skb, nlh);
 410
 411         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 412         if (ret)
 413                 goto err;
 414
 415         return 0;
 416
 417 err_param:
 418         nla_nest_cancel(dcbnl_skb, param_nest);
 419 err_pg:
 420         nla_nest_cancel(dcbnl_skb, pg_nest);
 421 nlmsg_failure:
 422 err:
 423         kfree(dcbnl_skb);
 424 err_out:
 425         ret  = -EINVAL;
 426         return ret;
 427 }
 428
 429 static int dcbnl_pgtx_getcfg(struct net_device *netdev, struct nlattr **tb,
 430                              u32 pid, u32 seq, u16 flags)
 431 {
 432         return __dcbnl_pg_getcfg(netdev, tb, pid, seq, flags, 0);
 433 }
 434
 435 static int dcbnl_pgrx_getcfg(struct net_device *netdev, struct nlattr **tb,
 436                              u32 pid, u32 seq, u16 flags)
 437 {
 438         return __dcbnl_pg_getcfg(netdev, tb, pid, seq, flags, 1);
 439 }
 440
 441 static int dcbnl_setstate(struct net_device *netdev, struct nlattr **tb,
 442                           u32 pid, u32 seq, u16 flags)
 443 {
 444         int ret = -EINVAL;
 445         u8 value;
 446
 447         if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->setstate)
 448                 return ret;
 449
 450         value = nla_get_u8(tb[DCB_ATTR_STATE]);
 451
 452         netdev->dcbnl_ops->setstate(netdev, value);
 453
 454         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_SSTATE, DCB_ATTR_STATE,
 455                           pid, seq, flags);
 456
 457         return ret;
 458 }
 459
 460 static int dcbnl_setpfccfg(struct net_device *netdev, struct nlattr **tb,
 461                            u32 pid, u32 seq, u16 flags)
 462 {
 463         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1];
 464         int i;
 465         int ret = -EINVAL;
 466         u8 value;
 467
 468         if (!tb[DCB_ATTR_PFC_CFG] || !netdev->dcbnl_ops->setpfccfg)
 469                 return ret;
 470
 471         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
 472                                tb[DCB_ATTR_PFC_CFG],
 473                                dcbnl_pfc_up_nest);
 474         if (ret)
 475                 goto err;
 476
 477         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 478                 if (data[i] == NULL)
 479                         continue;
 480                 value = nla_get_u8(data[i]);
 481                 netdev->dcbnl_ops->setpfccfg(netdev,
 482                         data[i]->nla_type - DCB_PFC_UP_ATTR_0, value);
 483         }
 484
 485         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SCFG, DCB_ATTR_PFC_CFG,
 486                           pid, seq, flags);
 487 err:
 488         return ret;
 489 }
 490
 491 static int dcbnl_setall(struct net_device *netdev, struct nlattr **tb,
 492                         u32 pid, u32 seq, u16 flags)
 493 {
 494         int ret = -EINVAL;
 495
 496         if (!tb[DCB_ATTR_SET_ALL] || !netdev->dcbnl_ops->setall)
 497                 return ret;
 498
 499         ret = dcbnl_reply(netdev->dcbnl_ops->setall(netdev), RTM_SETDCB,
 500                           DCB_CMD_SET_ALL, DCB_ATTR_SET_ALL, pid, seq, flags);
 501
 502         return ret;
 503 }
 504
 505 static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlattr **tb,
 506                              u32 pid, u32 seq, u16 flags, int dir)
 507 {
 508         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 509         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 510         int ret = -EINVAL;
 511         int i;
 512         u8 pgid;
 513         u8 up_map;
 514         u8 prio;
 515         u8 tc_pct;
 516
 517         if (!tb[DCB_ATTR_PG_CFG] ||
 518             !netdev->dcbnl_ops->setpgtccfgtx ||
 519             !netdev->dcbnl_ops->setpgtccfgrx ||
 520             !netdev->dcbnl_ops->setpgbwgcfgtx ||
 521             !netdev->dcbnl_ops->setpgbwgcfgrx)
 522                 return ret;
 523
 524         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
 525                                tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
 526         if (ret)
 527                 goto err;
 528
 529         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 530                 if (!pg_tb[i])
 531                         continue;
 532
 533                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
 534                                        pg_tb[i], dcbnl_tc_param_nest);
 535                 if (ret)
 536                         goto err;
 537
 538                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 539                 prio = DCB_ATTR_VALUE_UNDEFINED;
 540                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 541                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 542
 543                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO])
 544                         prio =
 545                             nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO]);
 546
 547                 if (param_tb[DCB_TC_ATTR_PARAM_PGID])
 548                         pgid = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_PGID]);
 549
 550                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT])
 551                         tc_pct = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_BW_PCT]);
 552
 553                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING])
 554                         up_map =
 555                              nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING]);
 556
 557                 /* dir: Tx = 0, Rx = 1 */
 558                 if (dir) {
 559                         /* Rx */
 560                         netdev->dcbnl_ops->setpgtccfgrx(netdev,
 561                                 i - DCB_PG_ATTR_TC_0,
 562                                 prio, pgid, tc_pct, up_map);
 563                 } else {
 564                         /* Tx */
 565                         netdev->dcbnl_ops->setpgtccfgtx(netdev,
 566                                 i - DCB_PG_ATTR_TC_0,
 567                                 prio, pgid, tc_pct, up_map);
 568                 }
 569         }
 570
 571         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 572                 if (!pg_tb[i])
 573                         continue;
 574
 575                 tc_pct = nla_get_u8(pg_tb[i]);
 576
 577                 /* dir: Tx = 0, Rx = 1 */
 578                 if (dir) {
 579                         /* Rx */
 580                         netdev->dcbnl_ops->setpgbwgcfgrx(netdev,
 581                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
 582                 } else {
 583                         /* Tx */
 584                         netdev->dcbnl_ops->setpgbwgcfgtx(netdev,
 585                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
 586                 }
 587         }
 588
 589         ret = dcbnl_reply(0, RTM_SETDCB,
 590                           (dir ? DCB_CMD_PGRX_SCFG : DCB_CMD_PGTX_SCFG),
 591                           DCB_ATTR_PG_CFG, pid, seq, flags);
 592
 593 err:
 594         return ret;
 595 }
 596
 597 static int dcbnl_pgtx_setcfg(struct net_device *netdev, struct nlattr **tb,
 598                              u32 pid, u32 seq, u16 flags)
 599 {
 600         return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 0);
 601 }
 602
 603 static int dcbnl_pgrx_setcfg(struct net_device *netdev, struct nlattr **tb,
 604                              u32 pid, u32 seq, u16 flags)
 605 {
 606         return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 1);
 607 }
 608
 609 static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 610 {
 611         struct net *net = sock_net(skb->sk);
 612         struct net_device *netdev;
 613         struct dcbmsg  *dcb = (struct dcbmsg *)NLMSG_DATA(nlh);
 614         struct nlattr *tb[DCB_ATTR_MAX + 1];
 615         u32 pid = skb ? NETLINK_CB(skb).pid : 0;
 616         int ret = -EINVAL;
 617
 618         if (net != &init_net)
 619                 return -EINVAL;
 620
 621         ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
 622                           dcbnl_rtnl_policy);
 623         if (ret < 0)
 624                 return ret;
 625
 626         if (!tb[DCB_ATTR_IFNAME])
 627                 return -EINVAL;
 628
 629         netdev = dev_get_by_name(&init_net, nla_data(tb[DCB_ATTR_IFNAME]));
 630         if (!netdev)
 631                 return -EINVAL;
 632
 633         if (!netdev->dcbnl_ops)
 634                 goto errout;
 635
 636         switch (dcb->cmd) {
 637         case DCB_CMD_GSTATE:
 638                 ret = dcbnl_getstate(netdev, tb, pid, nlh->nlmsg_seq,
 639                                      nlh->nlmsg_flags);
 640                 goto out;
 641         case DCB_CMD_PFC_GCFG:
 642                 ret = dcbnl_getpfccfg(netdev, tb, pid, nlh->nlmsg_seq,
 643                                       nlh->nlmsg_flags);
 644                 goto out;
 645         case DCB_CMD_GPERM_HWADDR:
 646                 ret = dcbnl_getperm_hwaddr(netdev, tb, pid, nlh->nlmsg_seq,
 647                                            nlh->nlmsg_flags);
 648                 goto out;
 649         case DCB_CMD_PGTX_GCFG:
 650                 ret = dcbnl_pgtx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
 651                                         nlh->nlmsg_flags);
 652                 goto out;
 653         case DCB_CMD_PGRX_GCFG:
 654                 ret = dcbnl_pgrx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
 655                                         nlh->nlmsg_flags);
 656                 goto out;
 657         case DCB_CMD_SSTATE:
 658                 ret = dcbnl_setstate(netdev, tb, pid, nlh->nlmsg_seq,
 659                                      nlh->nlmsg_flags);
 660                 goto out;
 661         case DCB_CMD_PFC_SCFG:
 662                 ret = dcbnl_setpfccfg(netdev, tb, pid, nlh->nlmsg_seq,
 663                                       nlh->nlmsg_flags);
 664                 goto out;
 665
 666         case DCB_CMD_SET_ALL:
 667                 ret = dcbnl_setall(netdev, tb, pid, nlh->nlmsg_seq,
 668                                    nlh->nlmsg_flags);
 669                 goto out;
 670         case DCB_CMD_PGTX_SCFG:
 671                 ret = dcbnl_pgtx_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
 672                                         nlh->nlmsg_flags);
 673                 goto out;
 674         case DCB_CMD_PGRX_SCFG:
 675                 ret = dcbnl_pgrx_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
 676                                         nlh->nlmsg_flags);
 677                 goto out;
 678         default:
 679                 goto errout;
 680         }
 681 errout:
 682         ret = -EINVAL;
 683 out:
 684         dev_put(netdev);
 685         return ret;
 686 }
 687
 688 static int __init dcbnl_init(void)
 689 {
 690         rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL);
 691         rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL);
 692
 693         return 0;
 694 }
 695 module_init(dcbnl_init);
 696
 697 static void __exit dcbnl_exit(void)
 698 {
 699         rtnl_unregister(PF_UNSPEC, RTM_GETDCB);
 700         rtnl_unregister(PF_UNSPEC, RTM_SETDCB);
 701 }
 702 module_exit(dcbnl_exit);
 703
 704