git.oblomov.eu Git - linux-2.6/blob - net/dcb/dcbnl.c

   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         [DCB_ATTR_CAP]       = {.type = NLA_NESTED},
  65         [DCB_ATTR_PFC_STATE] = {.type = NLA_U8},
  66 };
  67
  68 /* DCB priority flow control to User Priority nested attributes */
  69 static struct nla_policy dcbnl_pfc_up_nest[DCB_PFC_UP_ATTR_MAX + 1] = {
  70         [DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},
  71         [DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},
  72         [DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},
  73         [DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},
  74         [DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},
  75         [DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},
  76         [DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},
  77         [DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},
  78         [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},
  79 };
  80
  81 /* DCB priority grouping nested attributes */
  82 static struct nla_policy dcbnl_pg_nest[DCB_PG_ATTR_MAX + 1] = {
  83         [DCB_PG_ATTR_TC_0]      = {.type = NLA_NESTED},
  84         [DCB_PG_ATTR_TC_1]      = {.type = NLA_NESTED},
  85         [DCB_PG_ATTR_TC_2]      = {.type = NLA_NESTED},
  86         [DCB_PG_ATTR_TC_3]      = {.type = NLA_NESTED},
  87         [DCB_PG_ATTR_TC_4]      = {.type = NLA_NESTED},
  88         [DCB_PG_ATTR_TC_5]      = {.type = NLA_NESTED},
  89         [DCB_PG_ATTR_TC_6]      = {.type = NLA_NESTED},
  90         [DCB_PG_ATTR_TC_7]      = {.type = NLA_NESTED},
  91         [DCB_PG_ATTR_TC_ALL]    = {.type = NLA_NESTED},
  92         [DCB_PG_ATTR_BW_ID_0]   = {.type = NLA_U8},
  93         [DCB_PG_ATTR_BW_ID_1]   = {.type = NLA_U8},
  94         [DCB_PG_ATTR_BW_ID_2]   = {.type = NLA_U8},
  95         [DCB_PG_ATTR_BW_ID_3]   = {.type = NLA_U8},
  96         [DCB_PG_ATTR_BW_ID_4]   = {.type = NLA_U8},
  97         [DCB_PG_ATTR_BW_ID_5]   = {.type = NLA_U8},
  98         [DCB_PG_ATTR_BW_ID_6]   = {.type = NLA_U8},
  99         [DCB_PG_ATTR_BW_ID_7]   = {.type = NLA_U8},
 100         [DCB_PG_ATTR_BW_ID_ALL] = {.type = NLA_FLAG},
 101 };
 102
 103 /* DCB traffic class nested attributes. */
 104 static struct nla_policy dcbnl_tc_param_nest[DCB_TC_ATTR_PARAM_MAX + 1] = {
 105         [DCB_TC_ATTR_PARAM_PGID]            = {.type = NLA_U8},
 106         [DCB_TC_ATTR_PARAM_UP_MAPPING]      = {.type = NLA_U8},
 107         [DCB_TC_ATTR_PARAM_STRICT_PRIO]     = {.type = NLA_U8},
 108         [DCB_TC_ATTR_PARAM_BW_PCT]          = {.type = NLA_U8},
 109         [DCB_TC_ATTR_PARAM_ALL]             = {.type = NLA_FLAG},
 110 };
 111
 112 /* DCB capabilities nested attributes. */
 113 static struct nla_policy dcbnl_cap_nest[DCB_CAP_ATTR_MAX + 1] = {
 114         [DCB_CAP_ATTR_ALL]     = {.type = NLA_FLAG},
 115         [DCB_CAP_ATTR_PG]      = {.type = NLA_U8},
 116         [DCB_CAP_ATTR_PFC]     = {.type = NLA_U8},
 117         [DCB_CAP_ATTR_UP2TC]   = {.type = NLA_U8},
 118         [DCB_CAP_ATTR_PG_TCS]  = {.type = NLA_U8},
 119         [DCB_CAP_ATTR_PFC_TCS] = {.type = NLA_U8},
 120         [DCB_CAP_ATTR_GSP]     = {.type = NLA_U8},
 121         [DCB_CAP_ATTR_BCN]     = {.type = NLA_U8},
 122 };
 123
 124 /* DCB capabilities nested attributes. */
 125 static struct nla_policy dcbnl_numtcs_nest[DCB_NUMTCS_ATTR_MAX + 1] = {
 126         [DCB_NUMTCS_ATTR_ALL]     = {.type = NLA_FLAG},
 127         [DCB_NUMTCS_ATTR_PG]      = {.type = NLA_U8},
 128         [DCB_NUMTCS_ATTR_PFC]     = {.type = NLA_U8},
 129 };
 130
 131 /* standard netlink reply call */
 132 static int dcbnl_reply(u8 value, u8 event, u8 cmd, u8 attr, u32 pid,
 133                        u32 seq, u16 flags)
 134 {
 135         struct sk_buff *dcbnl_skb;
 136         struct dcbmsg *dcb;
 137         struct nlmsghdr *nlh;
 138         int ret = -EINVAL;
 139
 140         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 141         if (!dcbnl_skb)
 142                 return ret;
 143
 144         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, event, sizeof(*dcb), flags);
 145
 146         dcb = NLMSG_DATA(nlh);
 147         dcb->dcb_family = AF_UNSPEC;
 148         dcb->cmd = cmd;
 149         dcb->dcb_pad = 0;
 150
 151         ret = nla_put_u8(dcbnl_skb, attr, value);
 152         if (ret)
 153                 goto err;
 154
 155         /* end the message, assign the nlmsg_len. */
 156         nlmsg_end(dcbnl_skb, nlh);
 157         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 158         if (ret)
 159                 goto err;
 160
 161         return 0;
 162 nlmsg_failure:
 163 err:
 164         kfree(dcbnl_skb);
 165         return ret;
 166 }
 167
 168 static int dcbnl_getstate(struct net_device *netdev, struct nlattr **tb,
 169                           u32 pid, u32 seq, u16 flags)
 170 {
 171         int ret = -EINVAL;
 172
 173         /* if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->getstate) */
 174         if (!netdev->dcbnl_ops->getstate)
 175                 return ret;
 176
 177         ret = dcbnl_reply(netdev->dcbnl_ops->getstate(netdev), RTM_GETDCB,
 178                           DCB_CMD_GSTATE, DCB_ATTR_STATE, pid, seq, flags);
 179
 180         return ret;
 181 }
 182
 183 static int dcbnl_getpfccfg(struct net_device *netdev, struct nlattr **tb,
 184                            u32 pid, u32 seq, u16 flags)
 185 {
 186         struct sk_buff *dcbnl_skb;
 187         struct nlmsghdr *nlh;
 188         struct dcbmsg *dcb;
 189         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1], *nest;
 190         u8 value;
 191         int ret = -EINVAL;
 192         int i;
 193         int getall = 0;
 194
 195         if (!tb[DCB_ATTR_PFC_CFG] || !netdev->dcbnl_ops->getpfccfg)
 196                 return ret;
 197
 198         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
 199                                tb[DCB_ATTR_PFC_CFG],
 200                                dcbnl_pfc_up_nest);
 201         if (ret)
 202                 goto err_out;
 203
 204         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 205         if (!dcbnl_skb)
 206                 goto err_out;
 207
 208         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 209
 210         dcb = NLMSG_DATA(nlh);
 211         dcb->dcb_family = AF_UNSPEC;
 212         dcb->cmd = DCB_CMD_PFC_GCFG;
 213
 214         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_PFC_CFG);
 215         if (!nest)
 216                 goto err;
 217
 218         if (data[DCB_PFC_UP_ATTR_ALL])
 219                 getall = 1;
 220
 221         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 222                 if (!getall && !data[i])
 223                         continue;
 224
 225                 netdev->dcbnl_ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0,
 226                                              &value);
 227                 ret = nla_put_u8(dcbnl_skb, i, value);
 228
 229                 if (ret) {
 230                         nla_nest_cancel(dcbnl_skb, nest);
 231                         goto err;
 232                 }
 233         }
 234         nla_nest_end(dcbnl_skb, nest);
 235
 236         nlmsg_end(dcbnl_skb, nlh);
 237
 238         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 239         if (ret)
 240                 goto err;
 241
 242         return 0;
 243 nlmsg_failure:
 244 err:
 245         kfree(dcbnl_skb);
 246 err_out:
 247         return -EINVAL;
 248 }
 249
 250 static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlattr **tb,
 251                                 u32 pid, u32 seq, u16 flags)
 252 {
 253         struct sk_buff *dcbnl_skb;
 254         struct nlmsghdr *nlh;
 255         struct dcbmsg *dcb;
 256         u8 perm_addr[MAX_ADDR_LEN];
 257         int ret = -EINVAL;
 258
 259         if (!netdev->dcbnl_ops->getpermhwaddr)
 260                 return ret;
 261
 262         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 263         if (!dcbnl_skb)
 264                 goto err_out;
 265
 266         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 267
 268         dcb = NLMSG_DATA(nlh);
 269         dcb->dcb_family = AF_UNSPEC;
 270         dcb->cmd = DCB_CMD_GPERM_HWADDR;
 271
 272         netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);
 273
 274         ret = nla_put(dcbnl_skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr),
 275                       perm_addr);
 276
 277         nlmsg_end(dcbnl_skb, nlh);
 278
 279         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 280         if (ret)
 281                 goto err;
 282
 283         return 0;
 284
 285 nlmsg_failure:
 286 err:
 287         kfree(dcbnl_skb);
 288 err_out:
 289         return -EINVAL;
 290 }
 291
 292 static int dcbnl_getcap(struct net_device *netdev, struct nlattr **tb,
 293                         u32 pid, u32 seq, u16 flags)
 294 {
 295         struct sk_buff *dcbnl_skb;
 296         struct nlmsghdr *nlh;
 297         struct dcbmsg *dcb;
 298         struct nlattr *data[DCB_CAP_ATTR_MAX + 1], *nest;
 299         u8 value;
 300         int ret = -EINVAL;
 301         int i;
 302         int getall = 0;
 303
 304         if (!tb[DCB_ATTR_CAP] || !netdev->dcbnl_ops->getcap)
 305                 return ret;
 306
 307         ret = nla_parse_nested(data, DCB_CAP_ATTR_MAX, tb[DCB_ATTR_CAP],
 308                                dcbnl_cap_nest);
 309         if (ret)
 310                 goto err_out;
 311
 312         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 313         if (!dcbnl_skb)
 314                 goto err_out;
 315
 316         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 317
 318         dcb = NLMSG_DATA(nlh);
 319         dcb->dcb_family = AF_UNSPEC;
 320         dcb->cmd = DCB_CMD_GCAP;
 321
 322         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_CAP);
 323         if (!nest)
 324                 goto err;
 325
 326         if (data[DCB_CAP_ATTR_ALL])
 327                 getall = 1;
 328
 329         for (i = DCB_CAP_ATTR_ALL+1; i <= DCB_CAP_ATTR_MAX; i++) {
 330                 if (!getall && !data[i])
 331                         continue;
 332
 333                 if (!netdev->dcbnl_ops->getcap(netdev, i, &value)) {
 334                         ret = nla_put_u8(dcbnl_skb, i, value);
 335
 336                         if (ret) {
 337                                 nla_nest_cancel(dcbnl_skb, nest);
 338                                 goto err;
 339                         }
 340                 }
 341         }
 342         nla_nest_end(dcbnl_skb, nest);
 343
 344         nlmsg_end(dcbnl_skb, nlh);
 345
 346         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 347         if (ret)
 348                 goto err;
 349
 350         return 0;
 351 nlmsg_failure:
 352 err:
 353         kfree(dcbnl_skb);
 354 err_out:
 355         return -EINVAL;
 356 }
 357
 358 static int dcbnl_getnumtcs(struct net_device *netdev, struct nlattr **tb,
 359                            u32 pid, u32 seq, u16 flags)
 360 {
 361         struct sk_buff *dcbnl_skb;
 362         struct nlmsghdr *nlh;
 363         struct dcbmsg *dcb;
 364         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1], *nest;
 365         u8 value;
 366         int ret = -EINVAL;
 367         int i;
 368         int getall = 0;
 369
 370         if (!tb[DCB_ATTR_NUMTCS] || !netdev->dcbnl_ops->getnumtcs)
 371                 return ret;
 372
 373         ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
 374                                dcbnl_numtcs_nest);
 375         if (ret) {
 376                 ret = -EINVAL;
 377                 goto err_out;
 378         }
 379
 380         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 381         if (!dcbnl_skb) {
 382                 ret = -EINVAL;
 383                 goto err_out;
 384         }
 385
 386         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 387
 388         dcb = NLMSG_DATA(nlh);
 389         dcb->dcb_family = AF_UNSPEC;
 390         dcb->cmd = DCB_CMD_GNUMTCS;
 391
 392         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_NUMTCS);
 393         if (!nest) {
 394                 ret = -EINVAL;
 395                 goto err;
 396         }
 397
 398         if (data[DCB_NUMTCS_ATTR_ALL])
 399                 getall = 1;
 400
 401         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
 402                 if (!getall && !data[i])
 403                         continue;
 404
 405                 ret = netdev->dcbnl_ops->getnumtcs(netdev, i, &value);
 406                 if (!ret) {
 407                         ret = nla_put_u8(dcbnl_skb, i, value);
 408
 409                         if (ret) {
 410                                 nla_nest_cancel(dcbnl_skb, nest);
 411                                 ret = -EINVAL;
 412                                 goto err;
 413                         }
 414                 } else {
 415                         goto err;
 416                 }
 417         }
 418         nla_nest_end(dcbnl_skb, nest);
 419
 420         nlmsg_end(dcbnl_skb, nlh);
 421
 422         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 423         if (ret) {
 424                 ret = -EINVAL;
 425                 goto err;
 426         }
 427
 428         return 0;
 429 nlmsg_failure:
 430 err:
 431         kfree(dcbnl_skb);
 432 err_out:
 433         return ret;
 434 }
 435
 436 static int dcbnl_setnumtcs(struct net_device *netdev, struct nlattr **tb,
 437                            u32 pid, u32 seq, u16 flags)
 438 {
 439         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1];
 440         int ret = -EINVAL;
 441         u8 value;
 442         int i;
 443
 444         if (!tb[DCB_ATTR_NUMTCS] || !netdev->dcbnl_ops->setstate)
 445                 return ret;
 446
 447         ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
 448                                dcbnl_numtcs_nest);
 449
 450         if (ret) {
 451                 ret = -EINVAL;
 452                 goto err;
 453         }
 454
 455         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
 456                 if (data[i] == NULL)
 457                         continue;
 458
 459                 value = nla_get_u8(data[i]);
 460
 461                 ret = netdev->dcbnl_ops->setnumtcs(netdev, i, value);
 462
 463                 if (ret)
 464                         goto operr;
 465         }
 466
 467 operr:
 468         ret = dcbnl_reply(!!ret, RTM_SETDCB, DCB_CMD_SNUMTCS,
 469                           DCB_ATTR_NUMTCS, pid, seq, flags);
 470
 471 err:
 472         return ret;
 473 }
 474
 475 static int dcbnl_getpfcstate(struct net_device *netdev, struct nlattr **tb,
 476                              u32 pid, u32 seq, u16 flags)
 477 {
 478         int ret = -EINVAL;
 479
 480         if (!netdev->dcbnl_ops->getpfcstate)
 481                 return ret;
 482
 483         ret = dcbnl_reply(netdev->dcbnl_ops->getpfcstate(netdev), RTM_GETDCB,
 484                           DCB_CMD_PFC_GSTATE, DCB_ATTR_PFC_STATE,
 485                           pid, seq, flags);
 486
 487         return ret;
 488 }
 489
 490 static int dcbnl_setpfcstate(struct net_device *netdev, struct nlattr **tb,
 491                              u32 pid, u32 seq, u16 flags)
 492 {
 493         int ret = -EINVAL;
 494         u8 value;
 495
 496         if (!tb[DCB_ATTR_PFC_STATE] || !netdev->dcbnl_ops->setpfcstate)
 497                 return ret;
 498
 499         value = nla_get_u8(tb[DCB_ATTR_PFC_STATE]);
 500
 501         netdev->dcbnl_ops->setpfcstate(netdev, value);
 502
 503         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SSTATE, DCB_ATTR_PFC_STATE,
 504                           pid, seq, flags);
 505
 506         return ret;
 507 }
 508
 509 static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlattr **tb,
 510                              u32 pid, u32 seq, u16 flags, int dir)
 511 {
 512         struct sk_buff *dcbnl_skb;
 513         struct nlmsghdr *nlh;
 514         struct dcbmsg *dcb;
 515         struct nlattr *pg_nest, *param_nest, *data;
 516         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 517         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 518         u8 prio, pgid, tc_pct, up_map;
 519         int ret  = -EINVAL;
 520         int getall = 0;
 521         int i;
 522
 523         if (!tb[DCB_ATTR_PG_CFG] ||
 524             !netdev->dcbnl_ops->getpgtccfgtx ||
 525             !netdev->dcbnl_ops->getpgtccfgrx ||
 526             !netdev->dcbnl_ops->getpgbwgcfgtx ||
 527             !netdev->dcbnl_ops->getpgbwgcfgrx)
 528                 return ret;
 529
 530         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
 531                                tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
 532
 533         if (ret)
 534                 goto err_out;
 535
 536         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 537         if (!dcbnl_skb)
 538                 goto err_out;
 539
 540         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 541
 542         dcb = NLMSG_DATA(nlh);
 543         dcb->dcb_family = AF_UNSPEC;
 544         dcb->cmd = (dir) ? DCB_CMD_PGRX_GCFG : DCB_CMD_PGTX_GCFG;
 545
 546         pg_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_PG_CFG);
 547         if (!pg_nest)
 548                 goto err;
 549
 550         if (pg_tb[DCB_PG_ATTR_TC_ALL])
 551                 getall = 1;
 552
 553         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 554                 if (!getall && !pg_tb[i])
 555                         continue;
 556
 557                 if (pg_tb[DCB_PG_ATTR_TC_ALL])
 558                         data = pg_tb[DCB_PG_ATTR_TC_ALL];
 559                 else
 560                         data = pg_tb[i];
 561                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
 562                                        data, dcbnl_tc_param_nest);
 563                 if (ret)
 564                         goto err_pg;
 565
 566                 param_nest = nla_nest_start(dcbnl_skb, i);
 567                 if (!param_nest)
 568                         goto err_pg;
 569
 570                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 571                 prio = DCB_ATTR_VALUE_UNDEFINED;
 572                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 573                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 574
 575                 if (dir) {
 576                         /* Rx */
 577                         netdev->dcbnl_ops->getpgtccfgrx(netdev,
 578                                                 i - DCB_PG_ATTR_TC_0, &prio,
 579                                                 &pgid, &tc_pct, &up_map);
 580                 } else {
 581                         /* Tx */
 582                         netdev->dcbnl_ops->getpgtccfgtx(netdev,
 583                                                 i - DCB_PG_ATTR_TC_0, &prio,
 584                                                 &pgid, &tc_pct, &up_map);
 585                 }
 586
 587                 if (param_tb[DCB_TC_ATTR_PARAM_PGID] ||
 588                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 589                         ret = nla_put_u8(dcbnl_skb,
 590                                          DCB_TC_ATTR_PARAM_PGID, pgid);
 591                         if (ret)
 592                                 goto err_param;
 593                 }
 594                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING] ||
 595                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 596                         ret = nla_put_u8(dcbnl_skb,
 597                                          DCB_TC_ATTR_PARAM_UP_MAPPING, up_map);
 598                         if (ret)
 599                                 goto err_param;
 600                 }
 601                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO] ||
 602                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 603                         ret = nla_put_u8(dcbnl_skb,
 604                                          DCB_TC_ATTR_PARAM_STRICT_PRIO, prio);
 605                         if (ret)
 606                                 goto err_param;
 607                 }
 608                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT] ||
 609                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 610                         ret = nla_put_u8(dcbnl_skb, DCB_TC_ATTR_PARAM_BW_PCT,
 611                                          tc_pct);
 612                         if (ret)
 613                                 goto err_param;
 614                 }
 615                 nla_nest_end(dcbnl_skb, param_nest);
 616         }
 617
 618         if (pg_tb[DCB_PG_ATTR_BW_ID_ALL])
 619                 getall = 1;
 620         else
 621                 getall = 0;
 622
 623         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 624                 if (!getall && !pg_tb[i])
 625                         continue;
 626
 627                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 628
 629                 if (dir) {
 630                         /* Rx */
 631                         netdev->dcbnl_ops->getpgbwgcfgrx(netdev,
 632                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 633                 } else {
 634                         /* Tx */
 635                         netdev->dcbnl_ops->getpgbwgcfgtx(netdev,
 636                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 637                 }
 638                 ret = nla_put_u8(dcbnl_skb, i, tc_pct);
 639
 640                 if (ret)
 641                         goto err_pg;
 642         }
 643
 644         nla_nest_end(dcbnl_skb, pg_nest);
 645
 646         nlmsg_end(dcbnl_skb, nlh);
 647
 648         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 649         if (ret)
 650                 goto err;
 651
 652         return 0;
 653
 654 err_param:
 655         nla_nest_cancel(dcbnl_skb, param_nest);
 656 err_pg:
 657         nla_nest_cancel(dcbnl_skb, pg_nest);
 658 nlmsg_failure:
 659 err:
 660         kfree(dcbnl_skb);
 661 err_out:
 662         ret  = -EINVAL;
 663         return ret;
 664 }
 665
 666 static int dcbnl_pgtx_getcfg(struct net_device *netdev, struct nlattr **tb,
 667                              u32 pid, u32 seq, u16 flags)
 668 {
 669         return __dcbnl_pg_getcfg(netdev, tb, pid, seq, flags, 0);
 670 }
 671
 672 static int dcbnl_pgrx_getcfg(struct net_device *netdev, struct nlattr **tb,
 673                              u32 pid, u32 seq, u16 flags)
 674 {
 675         return __dcbnl_pg_getcfg(netdev, tb, pid, seq, flags, 1);
 676 }
 677
 678 static int dcbnl_setstate(struct net_device *netdev, struct nlattr **tb,
 679                           u32 pid, u32 seq, u16 flags)
 680 {
 681         int ret = -EINVAL;
 682         u8 value;
 683
 684         if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->setstate)
 685                 return ret;
 686
 687         value = nla_get_u8(tb[DCB_ATTR_STATE]);
 688
 689         netdev->dcbnl_ops->setstate(netdev, value);
 690
 691         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_SSTATE, DCB_ATTR_STATE,
 692                           pid, seq, flags);
 693
 694         return ret;
 695 }
 696
 697 static int dcbnl_setpfccfg(struct net_device *netdev, struct nlattr **tb,
 698                            u32 pid, u32 seq, u16 flags)
 699 {
 700         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1];
 701         int i;
 702         int ret = -EINVAL;
 703         u8 value;
 704
 705         if (!tb[DCB_ATTR_PFC_CFG] || !netdev->dcbnl_ops->setpfccfg)
 706                 return ret;
 707
 708         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
 709                                tb[DCB_ATTR_PFC_CFG],
 710                                dcbnl_pfc_up_nest);
 711         if (ret)
 712                 goto err;
 713
 714         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 715                 if (data[i] == NULL)
 716                         continue;
 717                 value = nla_get_u8(data[i]);
 718                 netdev->dcbnl_ops->setpfccfg(netdev,
 719                         data[i]->nla_type - DCB_PFC_UP_ATTR_0, value);
 720         }
 721
 722         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SCFG, DCB_ATTR_PFC_CFG,
 723                           pid, seq, flags);
 724 err:
 725         return ret;
 726 }
 727
 728 static int dcbnl_setall(struct net_device *netdev, struct nlattr **tb,
 729                         u32 pid, u32 seq, u16 flags)
 730 {
 731         int ret = -EINVAL;
 732
 733         if (!tb[DCB_ATTR_SET_ALL] || !netdev->dcbnl_ops->setall)
 734                 return ret;
 735
 736         ret = dcbnl_reply(netdev->dcbnl_ops->setall(netdev), RTM_SETDCB,
 737                           DCB_CMD_SET_ALL, DCB_ATTR_SET_ALL, pid, seq, flags);
 738
 739         return ret;
 740 }
 741
 742 static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlattr **tb,
 743                              u32 pid, u32 seq, u16 flags, int dir)
 744 {
 745         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 746         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 747         int ret = -EINVAL;
 748         int i;
 749         u8 pgid;
 750         u8 up_map;
 751         u8 prio;
 752         u8 tc_pct;
 753
 754         if (!tb[DCB_ATTR_PG_CFG] ||
 755             !netdev->dcbnl_ops->setpgtccfgtx ||
 756             !netdev->dcbnl_ops->setpgtccfgrx ||
 757             !netdev->dcbnl_ops->setpgbwgcfgtx ||
 758             !netdev->dcbnl_ops->setpgbwgcfgrx)
 759                 return ret;
 760
 761         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
 762                                tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
 763         if (ret)
 764                 goto err;
 765
 766         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 767                 if (!pg_tb[i])
 768                         continue;
 769
 770                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
 771                                        pg_tb[i], dcbnl_tc_param_nest);
 772                 if (ret)
 773                         goto err;
 774
 775                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 776                 prio = DCB_ATTR_VALUE_UNDEFINED;
 777                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 778                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 779
 780                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO])
 781                         prio =
 782                             nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO]);
 783
 784                 if (param_tb[DCB_TC_ATTR_PARAM_PGID])
 785                         pgid = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_PGID]);
 786
 787                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT])
 788                         tc_pct = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_BW_PCT]);
 789
 790                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING])
 791                         up_map =
 792                              nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING]);
 793
 794                 /* dir: Tx = 0, Rx = 1 */
 795                 if (dir) {
 796                         /* Rx */
 797                         netdev->dcbnl_ops->setpgtccfgrx(netdev,
 798                                 i - DCB_PG_ATTR_TC_0,
 799                                 prio, pgid, tc_pct, up_map);
 800                 } else {
 801                         /* Tx */
 802                         netdev->dcbnl_ops->setpgtccfgtx(netdev,
 803                                 i - DCB_PG_ATTR_TC_0,
 804                                 prio, pgid, tc_pct, up_map);
 805                 }
 806         }
 807
 808         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 809                 if (!pg_tb[i])
 810                         continue;
 811
 812                 tc_pct = nla_get_u8(pg_tb[i]);
 813
 814                 /* dir: Tx = 0, Rx = 1 */
 815                 if (dir) {
 816                         /* Rx */
 817                         netdev->dcbnl_ops->setpgbwgcfgrx(netdev,
 818                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
 819                 } else {
 820                         /* Tx */
 821                         netdev->dcbnl_ops->setpgbwgcfgtx(netdev,
 822                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
 823                 }
 824         }
 825
 826         ret = dcbnl_reply(0, RTM_SETDCB,
 827                           (dir ? DCB_CMD_PGRX_SCFG : DCB_CMD_PGTX_SCFG),
 828                           DCB_ATTR_PG_CFG, pid, seq, flags);
 829
 830 err:
 831         return ret;
 832 }
 833
 834 static int dcbnl_pgtx_setcfg(struct net_device *netdev, struct nlattr **tb,
 835                              u32 pid, u32 seq, u16 flags)
 836 {
 837         return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 0);
 838 }
 839
 840 static int dcbnl_pgrx_setcfg(struct net_device *netdev, struct nlattr **tb,
 841                              u32 pid, u32 seq, u16 flags)
 842 {
 843         return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 1);
 844 }
 845
 846 static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 847 {
 848         struct net *net = sock_net(skb->sk);
 849         struct net_device *netdev;
 850         struct dcbmsg  *dcb = (struct dcbmsg *)NLMSG_DATA(nlh);
 851         struct nlattr *tb[DCB_ATTR_MAX + 1];
 852         u32 pid = skb ? NETLINK_CB(skb).pid : 0;
 853         int ret = -EINVAL;
 854
 855         if (net != &init_net)
 856                 return -EINVAL;
 857
 858         ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
 859                           dcbnl_rtnl_policy);
 860         if (ret < 0)
 861                 return ret;
 862
 863         if (!tb[DCB_ATTR_IFNAME])
 864                 return -EINVAL;
 865
 866         netdev = dev_get_by_name(&init_net, nla_data(tb[DCB_ATTR_IFNAME]));
 867         if (!netdev)
 868                 return -EINVAL;
 869
 870         if (!netdev->dcbnl_ops)
 871                 goto errout;
 872
 873         switch (dcb->cmd) {
 874         case DCB_CMD_GSTATE:
 875                 ret = dcbnl_getstate(netdev, tb, pid, nlh->nlmsg_seq,
 876                                      nlh->nlmsg_flags);
 877                 goto out;
 878         case DCB_CMD_PFC_GCFG:
 879                 ret = dcbnl_getpfccfg(netdev, tb, pid, nlh->nlmsg_seq,
 880                                       nlh->nlmsg_flags);
 881                 goto out;
 882         case DCB_CMD_GPERM_HWADDR:
 883                 ret = dcbnl_getperm_hwaddr(netdev, tb, pid, nlh->nlmsg_seq,
 884                                            nlh->nlmsg_flags);
 885                 goto out;
 886         case DCB_CMD_PGTX_GCFG:
 887                 ret = dcbnl_pgtx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
 888                                         nlh->nlmsg_flags);
 889                 goto out;
 890         case DCB_CMD_PGRX_GCFG:
 891                 ret = dcbnl_pgrx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
 892                                         nlh->nlmsg_flags);
 893                 goto out;
 894         case DCB_CMD_SSTATE:
 895                 ret = dcbnl_setstate(netdev, tb, pid, nlh->nlmsg_seq,
 896                                      nlh->nlmsg_flags);
 897                 goto out;
 898         case DCB_CMD_PFC_SCFG:
 899                 ret = dcbnl_setpfccfg(netdev, tb, pid, nlh->nlmsg_seq,
 900                                       nlh->nlmsg_flags);
 901                 goto out;
 902
 903         case DCB_CMD_SET_ALL:
 904                 ret = dcbnl_setall(netdev, tb, pid, nlh->nlmsg_seq,
 905                                    nlh->nlmsg_flags);
 906                 goto out;
 907         case DCB_CMD_PGTX_SCFG:
 908                 ret = dcbnl_pgtx_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
 909                                         nlh->nlmsg_flags);
 910                 goto out;
 911         case DCB_CMD_PGRX_SCFG:
 912                 ret = dcbnl_pgrx_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
 913                                         nlh->nlmsg_flags);
 914                 goto out;
 915         case DCB_CMD_GCAP:
 916                 ret = dcbnl_getcap(netdev, tb, pid, nlh->nlmsg_seq,
 917                                    nlh->nlmsg_flags);
 918                 goto out;
 919         case DCB_CMD_GNUMTCS:
 920                 ret = dcbnl_getnumtcs(netdev, tb, pid, nlh->nlmsg_seq,
 921                                       nlh->nlmsg_flags);
 922                 goto out;
 923         case DCB_CMD_SNUMTCS:
 924                 ret = dcbnl_setnumtcs(netdev, tb, pid, nlh->nlmsg_seq,
 925                                       nlh->nlmsg_flags);
 926                 goto out;
 927         case DCB_CMD_PFC_GSTATE:
 928                 ret = dcbnl_getpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
 929                                         nlh->nlmsg_flags);
 930                 goto out;
 931         case DCB_CMD_PFC_SSTATE:
 932                 ret = dcbnl_setpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
 933                                         nlh->nlmsg_flags);
 934                 goto out;
 935         default:
 936                 goto errout;
 937         }
 938 errout:
 939         ret = -EINVAL;
 940 out:
 941         dev_put(netdev);
 942         return ret;
 943 }
 944
 945 static int __init dcbnl_init(void)
 946 {
 947         rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL);
 948         rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL);
 949
 950         return 0;
 951 }
 952 module_init(dcbnl_init);
 953
 954 static void __exit dcbnl_exit(void)
 955 {
 956         rtnl_unregister(PF_UNSPEC, RTM_GETDCB);
 957         rtnl_unregister(PF_UNSPEC, RTM_SETDCB);
 958 }
 959 module_exit(dcbnl_exit);
 960
 961