net/dcb/dcbnl.c

   1 /*
   2  * Copyright (c) 2008-2011, 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, see <http://www.gnu.org/licenses/>.
  15  *
  16  * Description: Data Center Bridging netlink interface
  17  * Author: Lucy Liu <lucy.liu@intel.com>
  18  */
  19
  20 #include <linux/netdevice.h>
  21 #include <linux/netlink.h>
  22 #include <linux/slab.h>
  23 #include <net/netlink.h>
  24 #include <net/rtnetlink.h>
  25 #include <linux/dcbnl.h>
  26 #include <net/dcbevent.h>
  27 #include <linux/rtnetlink.h>
  28 #include <linux/init.h>
  29 #include <net/sock.h>
  30
  31 /* Data Center Bridging (DCB) is a collection of Ethernet enhancements
  32  * intended to allow network traffic with differing requirements
  33  * (highly reliable, no drops vs. best effort vs. low latency) to operate
  34  * and co-exist on Ethernet.  Current DCB features are:
  35  *
  36  * Enhanced Transmission Selection (aka Priority Grouping [PG]) - provides a
  37  *   framework for assigning bandwidth guarantees to traffic classes.
  38  *
  39  * Priority-based Flow Control (PFC) - provides a flow control mechanism which
  40  *   can work independently for each 802.1p priority.
  41  *
  42  * Congestion Notification - provides a mechanism for end-to-end congestion
  43  *   control for protocols which do not have built-in congestion management.
  44  *
  45  * More information about the emerging standards for these Ethernet features
  46  * can be found at: http://www.ieee802.org/1/pages/dcbridges.html
  47  *
  48  * This file implements an rtnetlink interface to allow configuration of DCB
  49  * features for capable devices.
  50  */
  51
  52 /**************** DCB attribute policies *************************************/
  53
  54 /* DCB netlink attributes policy */
  55 static const struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {
  56         [DCB_ATTR_IFNAME]      = {.type = NLA_NUL_STRING, .len = IFNAMSIZ - 1},
  57         [DCB_ATTR_STATE]       = {.type = NLA_U8},
  58         [DCB_ATTR_PFC_CFG]     = {.type = NLA_NESTED},
  59         [DCB_ATTR_PG_CFG]      = {.type = NLA_NESTED},
  60         [DCB_ATTR_SET_ALL]     = {.type = NLA_U8},
  61         [DCB_ATTR_PERM_HWADDR] = {.type = NLA_FLAG},
  62         [DCB_ATTR_CAP]         = {.type = NLA_NESTED},
  63         [DCB_ATTR_PFC_STATE]   = {.type = NLA_U8},
  64         [DCB_ATTR_BCN]         = {.type = NLA_NESTED},
  65         [DCB_ATTR_APP]         = {.type = NLA_NESTED},
  66         [DCB_ATTR_IEEE]        = {.type = NLA_NESTED},
  67         [DCB_ATTR_DCBX]        = {.type = NLA_U8},
  68         [DCB_ATTR_FEATCFG]     = {.type = NLA_NESTED},
  69 };
  70
  71 /* DCB priority flow control to User Priority nested attributes */
  72 static const struct nla_policy dcbnl_pfc_up_nest[DCB_PFC_UP_ATTR_MAX + 1] = {
  73         [DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},
  74         [DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},
  75         [DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},
  76         [DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},
  77         [DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},
  78         [DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},
  79         [DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},
  80         [DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},
  81         [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},
  82 };
  83
  84 /* DCB priority grouping nested attributes */
  85 static const struct nla_policy dcbnl_pg_nest[DCB_PG_ATTR_MAX + 1] = {
  86         [DCB_PG_ATTR_TC_0]      = {.type = NLA_NESTED},
  87         [DCB_PG_ATTR_TC_1]      = {.type = NLA_NESTED},
  88         [DCB_PG_ATTR_TC_2]      = {.type = NLA_NESTED},
  89         [DCB_PG_ATTR_TC_3]      = {.type = NLA_NESTED},
  90         [DCB_PG_ATTR_TC_4]      = {.type = NLA_NESTED},
  91         [DCB_PG_ATTR_TC_5]      = {.type = NLA_NESTED},
  92         [DCB_PG_ATTR_TC_6]      = {.type = NLA_NESTED},
  93         [DCB_PG_ATTR_TC_7]      = {.type = NLA_NESTED},
  94         [DCB_PG_ATTR_TC_ALL]    = {.type = NLA_NESTED},
  95         [DCB_PG_ATTR_BW_ID_0]   = {.type = NLA_U8},
  96         [DCB_PG_ATTR_BW_ID_1]   = {.type = NLA_U8},
  97         [DCB_PG_ATTR_BW_ID_2]   = {.type = NLA_U8},
  98         [DCB_PG_ATTR_BW_ID_3]   = {.type = NLA_U8},
  99         [DCB_PG_ATTR_BW_ID_4]   = {.type = NLA_U8},
 100         [DCB_PG_ATTR_BW_ID_5]   = {.type = NLA_U8},
 101         [DCB_PG_ATTR_BW_ID_6]   = {.type = NLA_U8},
 102         [DCB_PG_ATTR_BW_ID_7]   = {.type = NLA_U8},
 103         [DCB_PG_ATTR_BW_ID_ALL] = {.type = NLA_FLAG},
 104 };
 105
 106 /* DCB traffic class nested attributes. */
 107 static const struct nla_policy dcbnl_tc_param_nest[DCB_TC_ATTR_PARAM_MAX + 1] = {
 108         [DCB_TC_ATTR_PARAM_PGID]            = {.type = NLA_U8},
 109         [DCB_TC_ATTR_PARAM_UP_MAPPING]      = {.type = NLA_U8},
 110         [DCB_TC_ATTR_PARAM_STRICT_PRIO]     = {.type = NLA_U8},
 111         [DCB_TC_ATTR_PARAM_BW_PCT]          = {.type = NLA_U8},
 112         [DCB_TC_ATTR_PARAM_ALL]             = {.type = NLA_FLAG},
 113 };
 114
 115 /* DCB capabilities nested attributes. */
 116 static const struct nla_policy dcbnl_cap_nest[DCB_CAP_ATTR_MAX + 1] = {
 117         [DCB_CAP_ATTR_ALL]     = {.type = NLA_FLAG},
 118         [DCB_CAP_ATTR_PG]      = {.type = NLA_U8},
 119         [DCB_CAP_ATTR_PFC]     = {.type = NLA_U8},
 120         [DCB_CAP_ATTR_UP2TC]   = {.type = NLA_U8},
 121         [DCB_CAP_ATTR_PG_TCS]  = {.type = NLA_U8},
 122         [DCB_CAP_ATTR_PFC_TCS] = {.type = NLA_U8},
 123         [DCB_CAP_ATTR_GSP]     = {.type = NLA_U8},
 124         [DCB_CAP_ATTR_BCN]     = {.type = NLA_U8},
 125         [DCB_CAP_ATTR_DCBX]    = {.type = NLA_U8},
 126 };
 127
 128 /* DCB capabilities nested attributes. */
 129 static const struct nla_policy dcbnl_numtcs_nest[DCB_NUMTCS_ATTR_MAX + 1] = {
 130         [DCB_NUMTCS_ATTR_ALL]     = {.type = NLA_FLAG},
 131         [DCB_NUMTCS_ATTR_PG]      = {.type = NLA_U8},
 132         [DCB_NUMTCS_ATTR_PFC]     = {.type = NLA_U8},
 133 };
 134
 135 /* DCB BCN nested attributes. */
 136 static const struct nla_policy dcbnl_bcn_nest[DCB_BCN_ATTR_MAX + 1] = {
 137         [DCB_BCN_ATTR_RP_0]         = {.type = NLA_U8},
 138         [DCB_BCN_ATTR_RP_1]         = {.type = NLA_U8},
 139         [DCB_BCN_ATTR_RP_2]         = {.type = NLA_U8},
 140         [DCB_BCN_ATTR_RP_3]         = {.type = NLA_U8},
 141         [DCB_BCN_ATTR_RP_4]         = {.type = NLA_U8},
 142         [DCB_BCN_ATTR_RP_5]         = {.type = NLA_U8},
 143         [DCB_BCN_ATTR_RP_6]         = {.type = NLA_U8},
 144         [DCB_BCN_ATTR_RP_7]         = {.type = NLA_U8},
 145         [DCB_BCN_ATTR_RP_ALL]       = {.type = NLA_FLAG},
 146         [DCB_BCN_ATTR_BCNA_0]       = {.type = NLA_U32},
 147         [DCB_BCN_ATTR_BCNA_1]       = {.type = NLA_U32},
 148         [DCB_BCN_ATTR_ALPHA]        = {.type = NLA_U32},
 149         [DCB_BCN_ATTR_BETA]         = {.type = NLA_U32},
 150         [DCB_BCN_ATTR_GD]           = {.type = NLA_U32},
 151         [DCB_BCN_ATTR_GI]           = {.type = NLA_U32},
 152         [DCB_BCN_ATTR_TMAX]         = {.type = NLA_U32},
 153         [DCB_BCN_ATTR_TD]           = {.type = NLA_U32},
 154         [DCB_BCN_ATTR_RMIN]         = {.type = NLA_U32},
 155         [DCB_BCN_ATTR_W]            = {.type = NLA_U32},
 156         [DCB_BCN_ATTR_RD]           = {.type = NLA_U32},
 157         [DCB_BCN_ATTR_RU]           = {.type = NLA_U32},
 158         [DCB_BCN_ATTR_WRTT]         = {.type = NLA_U32},
 159         [DCB_BCN_ATTR_RI]           = {.type = NLA_U32},
 160         [DCB_BCN_ATTR_C]            = {.type = NLA_U32},
 161         [DCB_BCN_ATTR_ALL]          = {.type = NLA_FLAG},
 162 };
 163
 164 /* DCB APP nested attributes. */
 165 static const struct nla_policy dcbnl_app_nest[DCB_APP_ATTR_MAX + 1] = {
 166         [DCB_APP_ATTR_IDTYPE]       = {.type = NLA_U8},
 167         [DCB_APP_ATTR_ID]           = {.type = NLA_U16},
 168         [DCB_APP_ATTR_PRIORITY]     = {.type = NLA_U8},
 169 };
 170
 171 /* IEEE 802.1Qaz nested attributes. */
 172 static const struct nla_policy dcbnl_ieee_policy[DCB_ATTR_IEEE_MAX + 1] = {
 173         [DCB_ATTR_IEEE_ETS]         = {.len = sizeof(struct ieee_ets)},
 174         [DCB_ATTR_IEEE_PFC]         = {.len = sizeof(struct ieee_pfc)},
 175         [DCB_ATTR_IEEE_APP_TABLE]   = {.type = NLA_NESTED},
 176         [DCB_ATTR_IEEE_MAXRATE]   = {.len = sizeof(struct ieee_maxrate)},
 177         [DCB_ATTR_IEEE_QCN]         = {.len = sizeof(struct ieee_qcn)},
 178         [DCB_ATTR_IEEE_QCN_STATS]   = {.len = sizeof(struct ieee_qcn_stats)},
 179         [DCB_ATTR_DCB_BUFFER]       = {.len = sizeof(struct dcbnl_buffer)},
 180 };
 181
 182 /* DCB number of traffic classes nested attributes. */
 183 static const struct nla_policy dcbnl_featcfg_nest[DCB_FEATCFG_ATTR_MAX + 1] = {
 184         [DCB_FEATCFG_ATTR_ALL]      = {.type = NLA_FLAG},
 185         [DCB_FEATCFG_ATTR_PG]       = {.type = NLA_U8},
 186         [DCB_FEATCFG_ATTR_PFC]      = {.type = NLA_U8},
 187         [DCB_FEATCFG_ATTR_APP]      = {.type = NLA_U8},
 188 };
 189
 190 static LIST_HEAD(dcb_app_list);
 191 static DEFINE_SPINLOCK(dcb_lock);
 192
 193 static struct sk_buff *dcbnl_newmsg(int type, u8 cmd, u32 port, u32 seq,
 194                                     u32 flags, struct nlmsghdr **nlhp)
 195 {
 196         struct sk_buff *skb;
 197         struct dcbmsg *dcb;
 198         struct nlmsghdr *nlh;
 199
 200         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 201         if (!skb)
 202                 return NULL;
 203
 204         nlh = nlmsg_put(skb, port, seq, type, sizeof(*dcb), flags);
 205         BUG_ON(!nlh);
 206
 207         dcb = nlmsg_data(nlh);
 208         dcb->dcb_family = AF_UNSPEC;
 209         dcb->cmd = cmd;
 210         dcb->dcb_pad = 0;
 211
 212         if (nlhp)
 213                 *nlhp = nlh;
 214
 215         return skb;
 216 }
 217
 218 static int dcbnl_getstate(struct net_device *netdev, struct nlmsghdr *nlh,
 219                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
 220 {
 221         /* if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->getstate) */
 222         if (!netdev->dcbnl_ops->getstate)
 223                 return -EOPNOTSUPP;
 224
 225         return nla_put_u8(skb, DCB_ATTR_STATE,
 226                           netdev->dcbnl_ops->getstate(netdev));
 227 }
 228
 229 static int dcbnl_getpfccfg(struct net_device *netdev, struct nlmsghdr *nlh,
 230                            u32 seq, struct nlattr **tb, struct sk_buff *skb)
 231 {
 232         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1], *nest;
 233         u8 value;
 234         int ret;
 235         int i;
 236         int getall = 0;
 237
 238         if (!tb[DCB_ATTR_PFC_CFG])
 239                 return -EINVAL;
 240
 241         if (!netdev->dcbnl_ops->getpfccfg)
 242                 return -EOPNOTSUPP;
 243
 244         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
 245                                tb[DCB_ATTR_PFC_CFG], dcbnl_pfc_up_nest, NULL);
 246         if (ret)
 247                 return ret;
 248
 249         nest = nla_nest_start(skb, DCB_ATTR_PFC_CFG);
 250         if (!nest)
 251                 return -EMSGSIZE;
 252
 253         if (data[DCB_PFC_UP_ATTR_ALL])
 254                 getall = 1;
 255
 256         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 257                 if (!getall && !data[i])
 258                         continue;
 259
 260                 netdev->dcbnl_ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0,
 261                                              &value);
 262                 ret = nla_put_u8(skb, i, value);
 263                 if (ret) {
 264                         nla_nest_cancel(skb, nest);
 265                         return ret;
 266                 }
 267         }
 268         nla_nest_end(skb, nest);
 269
 270         return 0;
 271 }
 272
 273 static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlmsghdr *nlh,
 274                                 u32 seq, struct nlattr **tb, struct sk_buff *skb)
 275 {
 276         u8 perm_addr[MAX_ADDR_LEN];
 277
 278         if (!netdev->dcbnl_ops->getpermhwaddr)
 279                 return -EOPNOTSUPP;
 280
 281         memset(perm_addr, 0, sizeof(perm_addr));
 282         netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);
 283
 284         return nla_put(skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr), perm_addr);
 285 }
 286
 287 static int dcbnl_getcap(struct net_device *netdev, struct nlmsghdr *nlh,
 288                         u32 seq, struct nlattr **tb, struct sk_buff *skb)
 289 {
 290         struct nlattr *data[DCB_CAP_ATTR_MAX + 1], *nest;
 291         u8 value;
 292         int ret;
 293         int i;
 294         int getall = 0;
 295
 296         if (!tb[DCB_ATTR_CAP])
 297                 return -EINVAL;
 298
 299         if (!netdev->dcbnl_ops->getcap)
 300                 return -EOPNOTSUPP;
 301
 302         ret = nla_parse_nested(data, DCB_CAP_ATTR_MAX, tb[DCB_ATTR_CAP],
 303                                dcbnl_cap_nest, NULL);
 304         if (ret)
 305                 return ret;
 306
 307         nest = nla_nest_start(skb, DCB_ATTR_CAP);
 308         if (!nest)
 309                 return -EMSGSIZE;
 310
 311         if (data[DCB_CAP_ATTR_ALL])
 312                 getall = 1;
 313
 314         for (i = DCB_CAP_ATTR_ALL+1; i <= DCB_CAP_ATTR_MAX; i++) {
 315                 if (!getall && !data[i])
 316                         continue;
 317
 318                 if (!netdev->dcbnl_ops->getcap(netdev, i, &value)) {
 319                         ret = nla_put_u8(skb, i, value);
 320                         if (ret) {
 321                                 nla_nest_cancel(skb, nest);
 322                                 return ret;
 323                         }
 324                 }
 325         }
 326         nla_nest_end(skb, nest);
 327
 328         return 0;
 329 }
 330
 331 static int dcbnl_getnumtcs(struct net_device *netdev, struct nlmsghdr *nlh,
 332                            u32 seq, struct nlattr **tb, struct sk_buff *skb)
 333 {
 334         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1], *nest;
 335         u8 value;
 336         int ret;
 337         int i;
 338         int getall = 0;
 339
 340         if (!tb[DCB_ATTR_NUMTCS])
 341                 return -EINVAL;
 342
 343         if (!netdev->dcbnl_ops->getnumtcs)
 344                 return -EOPNOTSUPP;
 345
 346         ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
 347                                dcbnl_numtcs_nest, NULL);
 348         if (ret)
 349                 return ret;
 350
 351         nest = nla_nest_start(skb, DCB_ATTR_NUMTCS);
 352         if (!nest)
 353                 return -EMSGSIZE;
 354
 355         if (data[DCB_NUMTCS_ATTR_ALL])
 356                 getall = 1;
 357
 358         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
 359                 if (!getall && !data[i])
 360                         continue;
 361
 362                 ret = netdev->dcbnl_ops->getnumtcs(netdev, i, &value);
 363                 if (!ret) {
 364                         ret = nla_put_u8(skb, i, value);
 365                         if (ret) {
 366                                 nla_nest_cancel(skb, nest);
 367                                 return ret;
 368                         }
 369                 } else
 370                         return -EINVAL;
 371         }
 372         nla_nest_end(skb, nest);
 373
 374         return 0;
 375 }
 376
 377 static int dcbnl_setnumtcs(struct net_device *netdev, struct nlmsghdr *nlh,
 378                            u32 seq, struct nlattr **tb, struct sk_buff *skb)
 379 {
 380         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1];
 381         int ret;
 382         u8 value;
 383         int i;
 384
 385         if (!tb[DCB_ATTR_NUMTCS])
 386                 return -EINVAL;
 387
 388         if (!netdev->dcbnl_ops->setnumtcs)
 389                 return -EOPNOTSUPP;
 390
 391         ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
 392                                dcbnl_numtcs_nest, NULL);
 393         if (ret)
 394                 return ret;
 395
 396         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
 397                 if (data[i] == NULL)
 398                         continue;
 399
 400                 value = nla_get_u8(data[i]);
 401
 402                 ret = netdev->dcbnl_ops->setnumtcs(netdev, i, value);
 403                 if (ret)
 404                         break;
 405         }
 406
 407         return nla_put_u8(skb, DCB_ATTR_NUMTCS, !!ret);
 408 }
 409
 410 static int dcbnl_getpfcstate(struct net_device *netdev, struct nlmsghdr *nlh,
 411                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 412 {
 413         if (!netdev->dcbnl_ops->getpfcstate)
 414                 return -EOPNOTSUPP;
 415
 416         return nla_put_u8(skb, DCB_ATTR_PFC_STATE,
 417                           netdev->dcbnl_ops->getpfcstate(netdev));
 418 }
 419
 420 static int dcbnl_setpfcstate(struct net_device *netdev, struct nlmsghdr *nlh,
 421                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 422 {
 423         u8 value;
 424
 425         if (!tb[DCB_ATTR_PFC_STATE])
 426                 return -EINVAL;
 427
 428         if (!netdev->dcbnl_ops->setpfcstate)
 429                 return -EOPNOTSUPP;
 430
 431         value = nla_get_u8(tb[DCB_ATTR_PFC_STATE]);
 432
 433         netdev->dcbnl_ops->setpfcstate(netdev, value);
 434
 435         return nla_put_u8(skb, DCB_ATTR_PFC_STATE, 0);
 436 }
 437
 438 static int dcbnl_getapp(struct net_device *netdev, struct nlmsghdr *nlh,
 439                         u32 seq, struct nlattr **tb, struct sk_buff *skb)
 440 {
 441         struct nlattr *app_nest;
 442         struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1];
 443         u16 id;
 444         u8 up, idtype;
 445         int ret;
 446
 447         if (!tb[DCB_ATTR_APP])
 448                 return -EINVAL;
 449
 450         ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP],
 451                                dcbnl_app_nest, NULL);
 452         if (ret)
 453                 return ret;
 454
 455         /* all must be non-null */
 456         if ((!app_tb[DCB_APP_ATTR_IDTYPE]) ||
 457             (!app_tb[DCB_APP_ATTR_ID]))
 458                 return -EINVAL;
 459
 460         /* either by eth type or by socket number */
 461         idtype = nla_get_u8(app_tb[DCB_APP_ATTR_IDTYPE]);
 462         if ((idtype != DCB_APP_IDTYPE_ETHTYPE) &&
 463             (idtype != DCB_APP_IDTYPE_PORTNUM))
 464                 return -EINVAL;
 465
 466         id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]);
 467
 468         if (netdev->dcbnl_ops->getapp) {
 469                 ret = netdev->dcbnl_ops->getapp(netdev, idtype, id);
 470                 if (ret < 0)
 471                         return ret;
 472                 else
 473                         up = ret;
 474         } else {
 475                 struct dcb_app app = {
 476                                         .selector = idtype,
 477                                         .protocol = id,
 478                                      };
 479                 up = dcb_getapp(netdev, &app);
 480         }
 481
 482         app_nest = nla_nest_start(skb, DCB_ATTR_APP);
 483         if (!app_nest)
 484                 return -EMSGSIZE;
 485
 486         ret = nla_put_u8(skb, DCB_APP_ATTR_IDTYPE, idtype);
 487         if (ret)
 488                 goto out_cancel;
 489
 490         ret = nla_put_u16(skb, DCB_APP_ATTR_ID, id);
 491         if (ret)
 492                 goto out_cancel;
 493
 494         ret = nla_put_u8(skb, DCB_APP_ATTR_PRIORITY, up);
 495         if (ret)
 496                 goto out_cancel;
 497
 498         nla_nest_end(skb, app_nest);
 499
 500         return 0;
 501
 502 out_cancel:
 503         nla_nest_cancel(skb, app_nest);
 504         return ret;
 505 }
 506
 507 static int dcbnl_setapp(struct net_device *netdev, struct nlmsghdr *nlh,
 508                         u32 seq, struct nlattr **tb, struct sk_buff *skb)
 509 {
 510         int ret;
 511         u16 id;
 512         u8 up, idtype;
 513         struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1];
 514
 515         if (!tb[DCB_ATTR_APP])
 516                 return -EINVAL;
 517
 518         ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP],
 519                                dcbnl_app_nest, NULL);
 520         if (ret)
 521                 return ret;
 522
 523         /* all must be non-null */
 524         if ((!app_tb[DCB_APP_ATTR_IDTYPE]) ||
 525             (!app_tb[DCB_APP_ATTR_ID]) ||
 526             (!app_tb[DCB_APP_ATTR_PRIORITY]))
 527                 return -EINVAL;
 528
 529         /* either by eth type or by socket number */
 530         idtype = nla_get_u8(app_tb[DCB_APP_ATTR_IDTYPE]);
 531         if ((idtype != DCB_APP_IDTYPE_ETHTYPE) &&
 532             (idtype != DCB_APP_IDTYPE_PORTNUM))
 533                 return -EINVAL;
 534
 535         id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]);
 536         up = nla_get_u8(app_tb[DCB_APP_ATTR_PRIORITY]);
 537
 538         if (netdev->dcbnl_ops->setapp) {
 539                 ret = netdev->dcbnl_ops->setapp(netdev, idtype, id, up);
 540                 if (ret < 0)
 541                         return ret;
 542         } else {
 543                 struct dcb_app app;
 544                 app.selector = idtype;
 545                 app.protocol = id;
 546                 app.priority = up;
 547                 ret = dcb_setapp(netdev, &app);
 548         }
 549
 550         ret = nla_put_u8(skb, DCB_ATTR_APP, ret);
 551         dcbnl_cee_notify(netdev, RTM_SETDCB, DCB_CMD_SAPP, seq, 0);
 552
 553         return ret;
 554 }
 555
 556 static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 557                              struct nlattr **tb, struct sk_buff *skb, int dir)
 558 {
 559         struct nlattr *pg_nest, *param_nest, *data;
 560         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 561         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 562         u8 prio, pgid, tc_pct, up_map;
 563         int ret;
 564         int getall = 0;
 565         int i;
 566
 567         if (!tb[DCB_ATTR_PG_CFG])
 568                 return -EINVAL;
 569
 570         if (!netdev->dcbnl_ops->getpgtccfgtx ||
 571             !netdev->dcbnl_ops->getpgtccfgrx ||
 572             !netdev->dcbnl_ops->getpgbwgcfgtx ||
 573             !netdev->dcbnl_ops->getpgbwgcfgrx)
 574                 return -EOPNOTSUPP;
 575
 576         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX, tb[DCB_ATTR_PG_CFG],
 577                                dcbnl_pg_nest, NULL);
 578         if (ret)
 579                 return ret;
 580
 581         pg_nest = nla_nest_start(skb, DCB_ATTR_PG_CFG);
 582         if (!pg_nest)
 583                 return -EMSGSIZE;
 584
 585         if (pg_tb[DCB_PG_ATTR_TC_ALL])
 586                 getall = 1;
 587
 588         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 589                 if (!getall && !pg_tb[i])
 590                         continue;
 591
 592                 if (pg_tb[DCB_PG_ATTR_TC_ALL])
 593                         data = pg_tb[DCB_PG_ATTR_TC_ALL];
 594                 else
 595                         data = pg_tb[i];
 596                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX, data,
 597                                        dcbnl_tc_param_nest, NULL);
 598                 if (ret)
 599                         goto err_pg;
 600
 601                 param_nest = nla_nest_start(skb, i);
 602                 if (!param_nest)
 603                         goto err_pg;
 604
 605                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 606                 prio = DCB_ATTR_VALUE_UNDEFINED;
 607                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 608                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 609
 610                 if (dir) {
 611                         /* Rx */
 612                         netdev->dcbnl_ops->getpgtccfgrx(netdev,
 613                                                 i - DCB_PG_ATTR_TC_0, &prio,
 614                                                 &pgid, &tc_pct, &up_map);
 615                 } else {
 616                         /* Tx */
 617                         netdev->dcbnl_ops->getpgtccfgtx(netdev,
 618                                                 i - DCB_PG_ATTR_TC_0, &prio,
 619                                                 &pgid, &tc_pct, &up_map);
 620                 }
 621
 622                 if (param_tb[DCB_TC_ATTR_PARAM_PGID] ||
 623                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 624                         ret = nla_put_u8(skb,
 625                                          DCB_TC_ATTR_PARAM_PGID, pgid);
 626                         if (ret)
 627                                 goto err_param;
 628                 }
 629                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING] ||
 630                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 631                         ret = nla_put_u8(skb,
 632                                          DCB_TC_ATTR_PARAM_UP_MAPPING, up_map);
 633                         if (ret)
 634                                 goto err_param;
 635                 }
 636                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO] ||
 637                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 638                         ret = nla_put_u8(skb,
 639                                          DCB_TC_ATTR_PARAM_STRICT_PRIO, prio);
 640                         if (ret)
 641                                 goto err_param;
 642                 }
 643                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT] ||
 644                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 645                         ret = nla_put_u8(skb, DCB_TC_ATTR_PARAM_BW_PCT,
 646                                          tc_pct);
 647                         if (ret)
 648                                 goto err_param;
 649                 }
 650                 nla_nest_end(skb, param_nest);
 651         }
 652
 653         if (pg_tb[DCB_PG_ATTR_BW_ID_ALL])
 654                 getall = 1;
 655         else
 656                 getall = 0;
 657
 658         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 659                 if (!getall && !pg_tb[i])
 660                         continue;
 661
 662                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 663
 664                 if (dir) {
 665                         /* Rx */
 666                         netdev->dcbnl_ops->getpgbwgcfgrx(netdev,
 667                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 668                 } else {
 669                         /* Tx */
 670                         netdev->dcbnl_ops->getpgbwgcfgtx(netdev,
 671                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 672                 }
 673                 ret = nla_put_u8(skb, i, tc_pct);
 674                 if (ret)
 675                         goto err_pg;
 676         }
 677
 678         nla_nest_end(skb, pg_nest);
 679
 680         return 0;
 681
 682 err_param:
 683         nla_nest_cancel(skb, param_nest);
 684 err_pg:
 685         nla_nest_cancel(skb, pg_nest);
 686
 687         return -EMSGSIZE;
 688 }
 689
 690 static int dcbnl_pgtx_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 691                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 692 {
 693         return __dcbnl_pg_getcfg(netdev, nlh, tb, skb, 0);
 694 }
 695
 696 static int dcbnl_pgrx_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 697                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 698 {
 699         return __dcbnl_pg_getcfg(netdev, nlh, tb, skb, 1);
 700 }
 701
 702 static int dcbnl_setstate(struct net_device *netdev, struct nlmsghdr *nlh,
 703                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
 704 {
 705         u8 value;
 706
 707         if (!tb[DCB_ATTR_STATE])
 708                 return -EINVAL;
 709
 710         if (!netdev->dcbnl_ops->setstate)
 711                 return -EOPNOTSUPP;
 712
 713         value = nla_get_u8(tb[DCB_ATTR_STATE]);
 714
 715         return nla_put_u8(skb, DCB_ATTR_STATE,
 716                           netdev->dcbnl_ops->setstate(netdev, value));
 717 }
 718
 719 static int dcbnl_setpfccfg(struct net_device *netdev, struct nlmsghdr *nlh,
 720                            u32 seq, struct nlattr **tb, struct sk_buff *skb)
 721 {
 722         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1];
 723         int i;
 724         int ret;
 725         u8 value;
 726
 727         if (!tb[DCB_ATTR_PFC_CFG])
 728                 return -EINVAL;
 729
 730         if (!netdev->dcbnl_ops->setpfccfg)
 731                 return -EOPNOTSUPP;
 732
 733         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
 734                                tb[DCB_ATTR_PFC_CFG], dcbnl_pfc_up_nest, NULL);
 735         if (ret)
 736                 return ret;
 737
 738         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 739                 if (data[i] == NULL)
 740                         continue;
 741                 value = nla_get_u8(data[i]);
 742                 netdev->dcbnl_ops->setpfccfg(netdev,
 743                         data[i]->nla_type - DCB_PFC_UP_ATTR_0, value);
 744         }
 745
 746         return nla_put_u8(skb, DCB_ATTR_PFC_CFG, 0);
 747 }
 748
 749 static int dcbnl_setall(struct net_device *netdev, struct nlmsghdr *nlh,
 750                         u32 seq, struct nlattr **tb, struct sk_buff *skb)
 751 {
 752         int ret;
 753
 754         if (!tb[DCB_ATTR_SET_ALL])
 755                 return -EINVAL;
 756
 757         if (!netdev->dcbnl_ops->setall)
 758                 return -EOPNOTSUPP;
 759
 760         ret = nla_put_u8(skb, DCB_ATTR_SET_ALL,
 761                          netdev->dcbnl_ops->setall(netdev));
 762         dcbnl_cee_notify(netdev, RTM_SETDCB, DCB_CMD_SET_ALL, seq, 0);
 763
 764         return ret;
 765 }
 766
 767 static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 768                              u32 seq, struct nlattr **tb, struct sk_buff *skb,
 769                              int dir)
 770 {
 771         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 772         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 773         int ret;
 774         int i;
 775         u8 pgid;
 776         u8 up_map;
 777         u8 prio;
 778         u8 tc_pct;
 779
 780         if (!tb[DCB_ATTR_PG_CFG])
 781                 return -EINVAL;
 782
 783         if (!netdev->dcbnl_ops->setpgtccfgtx ||
 784             !netdev->dcbnl_ops->setpgtccfgrx ||
 785             !netdev->dcbnl_ops->setpgbwgcfgtx ||
 786             !netdev->dcbnl_ops->setpgbwgcfgrx)
 787                 return -EOPNOTSUPP;
 788
 789         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX, tb[DCB_ATTR_PG_CFG],
 790                                dcbnl_pg_nest, NULL);
 791         if (ret)
 792                 return ret;
 793
 794         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 795                 if (!pg_tb[i])
 796                         continue;
 797
 798                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
 799                                        pg_tb[i], dcbnl_tc_param_nest, NULL);
 800                 if (ret)
 801                         return ret;
 802
 803                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 804                 prio = DCB_ATTR_VALUE_UNDEFINED;
 805                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 806                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 807
 808                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO])
 809                         prio =
 810                             nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO]);
 811
 812                 if (param_tb[DCB_TC_ATTR_PARAM_PGID])
 813                         pgid = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_PGID]);
 814
 815                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT])
 816                         tc_pct = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_BW_PCT]);
 817
 818                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING])
 819                         up_map =
 820                              nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING]);
 821
 822                 /* dir: Tx = 0, Rx = 1 */
 823                 if (dir) {
 824                         /* Rx */
 825                         netdev->dcbnl_ops->setpgtccfgrx(netdev,
 826                                 i - DCB_PG_ATTR_TC_0,
 827                                 prio, pgid, tc_pct, up_map);
 828                 } else {
 829                         /* Tx */
 830                         netdev->dcbnl_ops->setpgtccfgtx(netdev,
 831                                 i - DCB_PG_ATTR_TC_0,
 832                                 prio, pgid, tc_pct, up_map);
 833                 }
 834         }
 835
 836         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 837                 if (!pg_tb[i])
 838                         continue;
 839
 840                 tc_pct = nla_get_u8(pg_tb[i]);
 841
 842                 /* dir: Tx = 0, Rx = 1 */
 843                 if (dir) {
 844                         /* Rx */
 845                         netdev->dcbnl_ops->setpgbwgcfgrx(netdev,
 846                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
 847                 } else {
 848                         /* Tx */
 849                         netdev->dcbnl_ops->setpgbwgcfgtx(netdev,
 850                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
 851                 }
 852         }
 853
 854         return nla_put_u8(skb, DCB_ATTR_PG_CFG, 0);
 855 }
 856
 857 static int dcbnl_pgtx_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 858                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 859 {
 860         return __dcbnl_pg_setcfg(netdev, nlh, seq, tb, skb, 0);
 861 }
 862
 863 static int dcbnl_pgrx_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 864                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 865 {
 866         return __dcbnl_pg_setcfg(netdev, nlh, seq, tb, skb, 1);
 867 }
 868
 869 static int dcbnl_bcn_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 870                             u32 seq, struct nlattr **tb, struct sk_buff *skb)
 871 {
 872         struct nlattr *bcn_nest;
 873         struct nlattr *bcn_tb[DCB_BCN_ATTR_MAX + 1];
 874         u8 value_byte;
 875         u32 value_integer;
 876         int ret;
 877         bool getall = false;
 878         int i;
 879
 880         if (!tb[DCB_ATTR_BCN])
 881                 return -EINVAL;
 882
 883         if (!netdev->dcbnl_ops->getbcnrp ||
 884             !netdev->dcbnl_ops->getbcncfg)
 885                 return -EOPNOTSUPP;
 886
 887         ret = nla_parse_nested(bcn_tb, DCB_BCN_ATTR_MAX, tb[DCB_ATTR_BCN],
 888                                dcbnl_bcn_nest, NULL);
 889         if (ret)
 890                 return ret;
 891
 892         bcn_nest = nla_nest_start(skb, DCB_ATTR_BCN);
 893         if (!bcn_nest)
 894                 return -EMSGSIZE;
 895
 896         if (bcn_tb[DCB_BCN_ATTR_ALL])
 897                 getall = true;
 898
 899         for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
 900                 if (!getall && !bcn_tb[i])
 901                         continue;
 902
 903                 netdev->dcbnl_ops->getbcnrp(netdev, i - DCB_BCN_ATTR_RP_0,
 904                                             &value_byte);
 905                 ret = nla_put_u8(skb, i, value_byte);
 906                 if (ret)
 907                         goto err_bcn;
 908         }
 909
 910         for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {
 911                 if (!getall && !bcn_tb[i])
 912                         continue;
 913
 914                 netdev->dcbnl_ops->getbcncfg(netdev, i,
 915                                              &value_integer);
 916                 ret = nla_put_u32(skb, i, value_integer);
 917                 if (ret)
 918                         goto err_bcn;
 919         }
 920
 921         nla_nest_end(skb, bcn_nest);
 922
 923         return 0;
 924
 925 err_bcn:
 926         nla_nest_cancel(skb, bcn_nest);
 927         return ret;
 928 }
 929
 930 static int dcbnl_bcn_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 931                             u32 seq, struct nlattr **tb, struct sk_buff *skb)
 932 {
 933         struct nlattr *data[DCB_BCN_ATTR_MAX + 1];
 934         int i;
 935         int ret;
 936         u8 value_byte;
 937         u32 value_int;
 938
 939         if (!tb[DCB_ATTR_BCN])
 940                 return -EINVAL;
 941
 942         if (!netdev->dcbnl_ops->setbcncfg ||
 943             !netdev->dcbnl_ops->setbcnrp)
 944                 return -EOPNOTSUPP;
 945
 946         ret = nla_parse_nested(data, DCB_BCN_ATTR_MAX, tb[DCB_ATTR_BCN],
 947                                dcbnl_pfc_up_nest, NULL);
 948         if (ret)
 949                 return ret;
 950
 951         for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
 952                 if (data[i] == NULL)
 953                         continue;
 954                 value_byte = nla_get_u8(data[i]);
 955                 netdev->dcbnl_ops->setbcnrp(netdev,
 956                         data[i]->nla_type - DCB_BCN_ATTR_RP_0, value_byte);
 957         }
 958
 959         for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {
 960                 if (data[i] == NULL)
 961                         continue;
 962                 value_int = nla_get_u32(data[i]);
 963                 netdev->dcbnl_ops->setbcncfg(netdev,
 964                                              i, value_int);
 965         }
 966
 967         return nla_put_u8(skb, DCB_ATTR_BCN, 0);
 968 }
 969
 970 static int dcbnl_build_peer_app(struct net_device *netdev, struct sk_buff* skb,
 971                                 int app_nested_type, int app_info_type,
 972                                 int app_entry_type)
 973 {
 974         struct dcb_peer_app_info info;
 975         struct dcb_app *table = NULL;
 976         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
 977         u16 app_count;
 978         int err;
 979
 980
 981         /**
 982          * retrieve the peer app configuration form the driver. If the driver
 983          * handlers fail exit without doing anything
 984          */
 985         err = ops->peer_getappinfo(netdev, &info, &app_count);
 986         if (!err && app_count) {
 987                 table = kmalloc_array(app_count, sizeof(struct dcb_app),
 988                                       GFP_KERNEL);
 989                 if (!table)
 990                         return -ENOMEM;
 991
 992                 err = ops->peer_getapptable(netdev, table);
 993         }
 994
 995         if (!err) {
 996                 u16 i;
 997                 struct nlattr *app;
 998
 999                 /**
1000                  * build the message, from here on the only possible failure
1001                  * is due to the skb size
1002                  */
1003                 err = -EMSGSIZE;
1004
1005                 app = nla_nest_start(skb, app_nested_type);
1006                 if (!app)
1007                         goto nla_put_failure;
1008
1009                 if (app_info_type &&
1010                     nla_put(skb, app_info_type, sizeof(info), &info))
1011                         goto nla_put_failure;
1012
1013                 for (i = 0; i < app_count; i++) {
1014                         if (nla_put(skb, app_entry_type, sizeof(struct dcb_app),
1015                                     &table[i]))
1016                                 goto nla_put_failure;
1017                 }
1018                 nla_nest_end(skb, app);
1019         }
1020         err = 0;
1021
1022 nla_put_failure:
1023         kfree(table);
1024         return err;
1025 }
1026
1027 /* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb GET commands. */
1028 static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
1029 {
1030         struct nlattr *ieee, *app;
1031         struct dcb_app_type *itr;
1032         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1033         int dcbx;
1034         int err;
1035
1036         if (nla_put_string(skb, DCB_ATTR_IFNAME, netdev->name))
1037                 return -EMSGSIZE;
1038
1039         ieee = nla_nest_start(skb, DCB_ATTR_IEEE);
1040         if (!ieee)
1041                 return -EMSGSIZE;
1042
1043         if (ops->ieee_getets) {
1044                 struct ieee_ets ets;
1045                 memset(&ets, 0, sizeof(ets));
1046                 err = ops->ieee_getets(netdev, &ets);
1047                 if (!err &&
1048                     nla_put(skb, DCB_ATTR_IEEE_ETS, sizeof(ets), &ets))
1049                         return -EMSGSIZE;
1050         }
1051
1052         if (ops->ieee_getmaxrate) {
1053                 struct ieee_maxrate maxrate;
1054                 memset(&maxrate, 0, sizeof(maxrate));
1055                 err = ops->ieee_getmaxrate(netdev, &maxrate);
1056                 if (!err) {
1057                         err = nla_put(skb, DCB_ATTR_IEEE_MAXRATE,
1058                                       sizeof(maxrate), &maxrate);
1059                         if (err)
1060                                 return -EMSGSIZE;
1061                 }
1062         }
1063
1064         if (ops->ieee_getqcn) {
1065                 struct ieee_qcn qcn;
1066
1067                 memset(&qcn, 0, sizeof(qcn));
1068                 err = ops->ieee_getqcn(netdev, &qcn);
1069                 if (!err) {
1070                         err = nla_put(skb, DCB_ATTR_IEEE_QCN,
1071                                       sizeof(qcn), &qcn);
1072                         if (err)
1073                                 return -EMSGSIZE;
1074                 }
1075         }
1076
1077         if (ops->ieee_getqcnstats) {
1078                 struct ieee_qcn_stats qcn_stats;
1079
1080                 memset(&qcn_stats, 0, sizeof(qcn_stats));
1081                 err = ops->ieee_getqcnstats(netdev, &qcn_stats);
1082                 if (!err) {
1083                         err = nla_put(skb, DCB_ATTR_IEEE_QCN_STATS,
1084                                       sizeof(qcn_stats), &qcn_stats);
1085                         if (err)
1086                                 return -EMSGSIZE;
1087                 }
1088         }
1089
1090         if (ops->ieee_getpfc) {
1091                 struct ieee_pfc pfc;
1092                 memset(&pfc, 0, sizeof(pfc));
1093                 err = ops->ieee_getpfc(netdev, &pfc);
1094                 if (!err &&
1095                     nla_put(skb, DCB_ATTR_IEEE_PFC, sizeof(pfc), &pfc))
1096                         return -EMSGSIZE;
1097         }
1098
1099         if (ops->dcbnl_getbuffer) {
1100                 struct dcbnl_buffer buffer;
1101
1102                 memset(&buffer, 0, sizeof(buffer));
1103                 err = ops->dcbnl_getbuffer(netdev, &buffer);
1104                 if (!err &&
1105                     nla_put(skb, DCB_ATTR_DCB_BUFFER, sizeof(buffer), &buffer))
1106                         return -EMSGSIZE;
1107         }
1108
1109         app = nla_nest_start(skb, DCB_ATTR_IEEE_APP_TABLE);
1110         if (!app)
1111                 return -EMSGSIZE;
1112
1113         spin_lock_bh(&dcb_lock);
1114         list_for_each_entry(itr, &dcb_app_list, list) {
1115                 if (itr->ifindex == netdev->ifindex) {
1116                         err = nla_put(skb, DCB_ATTR_IEEE_APP, sizeof(itr->app),
1117                                          &itr->app);
1118                         if (err) {
1119                                 spin_unlock_bh(&dcb_lock);
1120                                 return -EMSGSIZE;
1121                         }
1122                 }
1123         }
1124
1125         if (netdev->dcbnl_ops->getdcbx)
1126                 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
1127         else
1128                 dcbx = -EOPNOTSUPP;
1129
1130         spin_unlock_bh(&dcb_lock);
1131         nla_nest_end(skb, app);
1132
1133         /* get peer info if available */
1134         if (ops->ieee_peer_getets) {
1135                 struct ieee_ets ets;
1136                 memset(&ets, 0, sizeof(ets));
1137                 err = ops->ieee_peer_getets(netdev, &ets);
1138                 if (!err &&
1139                     nla_put(skb, DCB_ATTR_IEEE_PEER_ETS, sizeof(ets), &ets))
1140                         return -EMSGSIZE;
1141         }
1142
1143         if (ops->ieee_peer_getpfc) {
1144                 struct ieee_pfc pfc;
1145                 memset(&pfc, 0, sizeof(pfc));
1146                 err = ops->ieee_peer_getpfc(netdev, &pfc);
1147                 if (!err &&
1148                     nla_put(skb, DCB_ATTR_IEEE_PEER_PFC, sizeof(pfc), &pfc))
1149                         return -EMSGSIZE;
1150         }
1151
1152         if (ops->peer_getappinfo && ops->peer_getapptable) {
1153                 err = dcbnl_build_peer_app(netdev, skb,
1154                                            DCB_ATTR_IEEE_PEER_APP,
1155                                            DCB_ATTR_IEEE_APP_UNSPEC,
1156                                            DCB_ATTR_IEEE_APP);
1157                 if (err)
1158                         return -EMSGSIZE;
1159         }
1160
1161         nla_nest_end(skb, ieee);
1162         if (dcbx >= 0) {
1163                 err = nla_put_u8(skb, DCB_ATTR_DCBX, dcbx);
1164                 if (err)
1165                         return -EMSGSIZE;
1166         }
1167
1168         return 0;
1169 }
1170
1171 static int dcbnl_cee_pg_fill(struct sk_buff *skb, struct net_device *dev,
1172                              int dir)
1173 {
1174         u8 pgid, up_map, prio, tc_pct;
1175         const struct dcbnl_rtnl_ops *ops = dev->dcbnl_ops;
1176         int i = dir ? DCB_ATTR_CEE_TX_PG : DCB_ATTR_CEE_RX_PG;
1177         struct nlattr *pg = nla_nest_start(skb, i);
1178
1179         if (!pg)
1180                 return -EMSGSIZE;
1181
1182         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
1183                 struct nlattr *tc_nest = nla_nest_start(skb, i);
1184
1185                 if (!tc_nest)
1186                         return -EMSGSIZE;
1187
1188                 pgid = DCB_ATTR_VALUE_UNDEFINED;
1189                 prio = DCB_ATTR_VALUE_UNDEFINED;
1190                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
1191                 up_map = DCB_ATTR_VALUE_UNDEFINED;
1192
1193                 if (!dir)
1194                         ops->getpgtccfgrx(dev, i - DCB_PG_ATTR_TC_0,
1195                                           &prio, &pgid, &tc_pct, &up_map);
1196                 else
1197                         ops->getpgtccfgtx(dev, i - DCB_PG_ATTR_TC_0,
1198                                           &prio, &pgid, &tc_pct, &up_map);
1199
1200                 if (nla_put_u8(skb, DCB_TC_ATTR_PARAM_PGID, pgid) ||
1201                     nla_put_u8(skb, DCB_TC_ATTR_PARAM_UP_MAPPING, up_map) ||
1202                     nla_put_u8(skb, DCB_TC_ATTR_PARAM_STRICT_PRIO, prio) ||
1203                     nla_put_u8(skb, DCB_TC_ATTR_PARAM_BW_PCT, tc_pct))
1204                         return -EMSGSIZE;
1205                 nla_nest_end(skb, tc_nest);
1206         }
1207
1208         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
1209                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
1210
1211                 if (!dir)
1212                         ops->getpgbwgcfgrx(dev, i - DCB_PG_ATTR_BW_ID_0,
1213                                            &tc_pct);
1214                 else
1215                         ops->getpgbwgcfgtx(dev, i - DCB_PG_ATTR_BW_ID_0,
1216                                            &tc_pct);
1217                 if (nla_put_u8(skb, i, tc_pct))
1218                         return -EMSGSIZE;
1219         }
1220         nla_nest_end(skb, pg);
1221         return 0;
1222 }
1223
1224 static int dcbnl_cee_fill(struct sk_buff *skb, struct net_device *netdev)
1225 {
1226         struct nlattr *cee, *app;
1227         struct dcb_app_type *itr;
1228         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1229         int dcbx, i, err = -EMSGSIZE;
1230         u8 value;
1231
1232         if (nla_put_string(skb, DCB_ATTR_IFNAME, netdev->name))
1233                 goto nla_put_failure;
1234         cee = nla_nest_start(skb, DCB_ATTR_CEE);
1235         if (!cee)
1236                 goto nla_put_failure;
1237
1238         /* local pg */
1239         if (ops->getpgtccfgtx && ops->getpgbwgcfgtx) {
1240                 err = dcbnl_cee_pg_fill(skb, netdev, 1);
1241                 if (err)
1242                         goto nla_put_failure;
1243         }
1244
1245         if (ops->getpgtccfgrx && ops->getpgbwgcfgrx) {
1246                 err = dcbnl_cee_pg_fill(skb, netdev, 0);
1247                 if (err)
1248                         goto nla_put_failure;
1249         }
1250
1251         /* local pfc */
1252         if (ops->getpfccfg) {
1253                 struct nlattr *pfc_nest = nla_nest_start(skb, DCB_ATTR_CEE_PFC);
1254
1255                 if (!pfc_nest)
1256                         goto nla_put_failure;
1257
1258                 for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
1259                         ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0, &value);
1260                         if (nla_put_u8(skb, i, value))
1261                                 goto nla_put_failure;
1262                 }
1263                 nla_nest_end(skb, pfc_nest);
1264         }
1265
1266         /* local app */
1267         spin_lock_bh(&dcb_lock);
1268         app = nla_nest_start(skb, DCB_ATTR_CEE_APP_TABLE);
1269         if (!app)
1270                 goto dcb_unlock;
1271
1272         list_for_each_entry(itr, &dcb_app_list, list) {
1273                 if (itr->ifindex == netdev->ifindex) {
1274                         struct nlattr *app_nest = nla_nest_start(skb,
1275                                                                  DCB_ATTR_APP);
1276                         if (!app_nest)
1277                                 goto dcb_unlock;
1278
1279                         err = nla_put_u8(skb, DCB_APP_ATTR_IDTYPE,
1280                                          itr->app.selector);
1281                         if (err)
1282                                 goto dcb_unlock;
1283
1284                         err = nla_put_u16(skb, DCB_APP_ATTR_ID,
1285                                           itr->app.protocol);
1286                         if (err)
1287                                 goto dcb_unlock;
1288
1289                         err = nla_put_u8(skb, DCB_APP_ATTR_PRIORITY,
1290                                          itr->app.priority);
1291                         if (err)
1292                                 goto dcb_unlock;
1293
1294                         nla_nest_end(skb, app_nest);
1295                 }
1296         }
1297         nla_nest_end(skb, app);
1298
1299         if (netdev->dcbnl_ops->getdcbx)
1300                 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
1301         else
1302                 dcbx = -EOPNOTSUPP;
1303
1304         spin_unlock_bh(&dcb_lock);
1305
1306         /* features flags */
1307         if (ops->getfeatcfg) {
1308                 struct nlattr *feat = nla_nest_start(skb, DCB_ATTR_CEE_FEAT);
1309                 if (!feat)
1310                         goto nla_put_failure;
1311
1312                 for (i = DCB_FEATCFG_ATTR_ALL + 1; i <= DCB_FEATCFG_ATTR_MAX;
1313                      i++)
1314                         if (!ops->getfeatcfg(netdev, i, &value) &&
1315                             nla_put_u8(skb, i, value))
1316                                 goto nla_put_failure;
1317
1318                 nla_nest_end(skb, feat);
1319         }
1320
1321         /* peer info if available */
1322         if (ops->cee_peer_getpg) {
1323                 struct cee_pg pg;
1324                 memset(&pg, 0, sizeof(pg));
1325                 err = ops->cee_peer_getpg(netdev, &pg);
1326                 if (!err &&
1327                     nla_put(skb, DCB_ATTR_CEE_PEER_PG, sizeof(pg), &pg))
1328                         goto nla_put_failure;
1329         }
1330
1331         if (ops->cee_peer_getpfc) {
1332                 struct cee_pfc pfc;
1333                 memset(&pfc, 0, sizeof(pfc));
1334                 err = ops->cee_peer_getpfc(netdev, &pfc);
1335                 if (!err &&
1336                     nla_put(skb, DCB_ATTR_CEE_PEER_PFC, sizeof(pfc), &pfc))
1337                         goto nla_put_failure;
1338         }
1339
1340         if (ops->peer_getappinfo && ops->peer_getapptable) {
1341                 err = dcbnl_build_peer_app(netdev, skb,
1342                                            DCB_ATTR_CEE_PEER_APP_TABLE,
1343                                            DCB_ATTR_CEE_PEER_APP_INFO,
1344                                            DCB_ATTR_CEE_PEER_APP);
1345                 if (err)
1346                         goto nla_put_failure;
1347         }
1348         nla_nest_end(skb, cee);
1349
1350         /* DCBX state */
1351         if (dcbx >= 0) {
1352                 err = nla_put_u8(skb, DCB_ATTR_DCBX, dcbx);
1353                 if (err)
1354                         goto nla_put_failure;
1355         }
1356         return 0;
1357
1358 dcb_unlock:
1359         spin_unlock_bh(&dcb_lock);
1360 nla_put_failure:
1361         err = -EMSGSIZE;
1362         return err;
1363 }
1364
1365 static int dcbnl_notify(struct net_device *dev, int event, int cmd,
1366                         u32 seq, u32 portid, int dcbx_ver)
1367 {
1368         struct net *net = dev_net(dev);
1369         struct sk_buff *skb;
1370         struct nlmsghdr *nlh;
1371         const struct dcbnl_rtnl_ops *ops = dev->dcbnl_ops;
1372         int err;
1373
1374         if (!ops)
1375                 return -EOPNOTSUPP;
1376
1377         skb = dcbnl_newmsg(event, cmd, portid, seq, 0, &nlh);
1378         if (!skb)
1379                 return -ENOBUFS;
1380
1381         if (dcbx_ver == DCB_CAP_DCBX_VER_IEEE)
1382                 err = dcbnl_ieee_fill(skb, dev);
1383         else
1384                 err = dcbnl_cee_fill(skb, dev);
1385
1386         if (err < 0) {
1387                 /* Report error to broadcast listeners */
1388                 nlmsg_free(skb);
1389                 rtnl_set_sk_err(net, RTNLGRP_DCB, err);
1390         } else {
1391                 /* End nlmsg and notify broadcast listeners */
1392                 nlmsg_end(skb, nlh);
1393                 rtnl_notify(skb, net, 0, RTNLGRP_DCB, NULL, GFP_KERNEL);
1394         }
1395
1396         return err;
1397 }
1398
1399 int dcbnl_ieee_notify(struct net_device *dev, int event, int cmd,
1400                       u32 seq, u32 portid)
1401 {
1402         return dcbnl_notify(dev, event, cmd, seq, portid, DCB_CAP_DCBX_VER_IEEE);
1403 }
1404 EXPORT_SYMBOL(dcbnl_ieee_notify);
1405
1406 int dcbnl_cee_notify(struct net_device *dev, int event, int cmd,
1407                      u32 seq, u32 portid)
1408 {
1409         return dcbnl_notify(dev, event, cmd, seq, portid, DCB_CAP_DCBX_VER_CEE);
1410 }
1411 EXPORT_SYMBOL(dcbnl_cee_notify);
1412
1413 /* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb SET commands.
1414  * If any requested operation can not be completed
1415  * the entire msg is aborted and error value is returned.
1416  * No attempt is made to reconcile the case where only part of the
1417  * cmd can be completed.
1418  */
1419 static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh,
1420                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
1421 {
1422         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1423         struct nlattr *ieee[DCB_ATTR_IEEE_MAX + 1];
1424         int prio;
1425         int err;
1426
1427         if (!ops)
1428                 return -EOPNOTSUPP;
1429
1430         if (!tb[DCB_ATTR_IEEE])
1431                 return -EINVAL;
1432
1433         err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX, tb[DCB_ATTR_IEEE],
1434                                dcbnl_ieee_policy, NULL);
1435         if (err)
1436                 return err;
1437
1438         if (ieee[DCB_ATTR_IEEE_ETS] && ops->ieee_setets) {
1439                 struct ieee_ets *ets = nla_data(ieee[DCB_ATTR_IEEE_ETS]);
1440                 err = ops->ieee_setets(netdev, ets);
1441                 if (err)
1442                         goto err;
1443         }
1444
1445         if (ieee[DCB_ATTR_IEEE_MAXRATE] && ops->ieee_setmaxrate) {
1446                 struct ieee_maxrate *maxrate =
1447                         nla_data(ieee[DCB_ATTR_IEEE_MAXRATE]);
1448                 err = ops->ieee_setmaxrate(netdev, maxrate);
1449                 if (err)
1450                         goto err;
1451         }
1452
1453         if (ieee[DCB_ATTR_IEEE_QCN] && ops->ieee_setqcn) {
1454                 struct ieee_qcn *qcn =
1455                         nla_data(ieee[DCB_ATTR_IEEE_QCN]);
1456
1457                 err = ops->ieee_setqcn(netdev, qcn);
1458                 if (err)
1459                         goto err;
1460         }
1461
1462         if (ieee[DCB_ATTR_IEEE_PFC] && ops->ieee_setpfc) {
1463                 struct ieee_pfc *pfc = nla_data(ieee[DCB_ATTR_IEEE_PFC]);
1464                 err = ops->ieee_setpfc(netdev, pfc);
1465                 if (err)
1466                         goto err;
1467         }
1468
1469         if (ieee[DCB_ATTR_DCB_BUFFER] && ops->dcbnl_setbuffer) {
1470                 struct dcbnl_buffer *buffer =
1471                         nla_data(ieee[DCB_ATTR_DCB_BUFFER]);
1472
1473                 for (prio = 0; prio < ARRAY_SIZE(buffer->prio2buffer); prio++) {
1474                         if (buffer->prio2buffer[prio] >= DCBX_MAX_BUFFERS) {
1475                                 err = -EINVAL;
1476                                 goto err;
1477                         }
1478                 }
1479
1480                 err = ops->dcbnl_setbuffer(netdev, buffer);
1481                 if (err)
1482                         goto err;
1483         }
1484
1485         if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
1486                 struct nlattr *attr;
1487                 int rem;
1488
1489                 nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
1490                         struct dcb_app *app_data;
1491
1492                         if (nla_type(attr) != DCB_ATTR_IEEE_APP)
1493                                 continue;
1494
1495                         if (nla_len(attr) < sizeof(struct dcb_app)) {
1496                                 err = -ERANGE;
1497                                 goto err;
1498                         }
1499
1500                         app_data = nla_data(attr);
1501                         if (ops->ieee_setapp)
1502                                 err = ops->ieee_setapp(netdev, app_data);
1503                         else
1504                                 err = dcb_ieee_setapp(netdev, app_data);
1505                         if (err)
1506                                 goto err;
1507                 }
1508         }
1509
1510 err:
1511         err = nla_put_u8(skb, DCB_ATTR_IEEE, err);
1512         dcbnl_ieee_notify(netdev, RTM_SETDCB, DCB_CMD_IEEE_SET, seq, 0);
1513         return err;
1514 }
1515
1516 static int dcbnl_ieee_get(struct net_device *netdev, struct nlmsghdr *nlh,
1517                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
1518 {
1519         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1520
1521         if (!ops)
1522                 return -EOPNOTSUPP;
1523
1524         return dcbnl_ieee_fill(skb, netdev);
1525 }
1526
1527 static int dcbnl_ieee_del(struct net_device *netdev, struct nlmsghdr *nlh,
1528                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
1529 {
1530         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1531         struct nlattr *ieee[DCB_ATTR_IEEE_MAX + 1];
1532         int err;
1533
1534         if (!ops)
1535                 return -EOPNOTSUPP;
1536
1537         if (!tb[DCB_ATTR_IEEE])
1538                 return -EINVAL;
1539
1540         err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX, tb[DCB_ATTR_IEEE],
1541                                dcbnl_ieee_policy, NULL);
1542         if (err)
1543                 return err;
1544
1545         if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
1546                 struct nlattr *attr;
1547                 int rem;
1548
1549                 nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
1550                         struct dcb_app *app_data;
1551
1552                         if (nla_type(attr) != DCB_ATTR_IEEE_APP)
1553                                 continue;
1554                         app_data = nla_data(attr);
1555                         if (ops->ieee_delapp)
1556                                 err = ops->ieee_delapp(netdev, app_data);
1557                         else
1558                                 err = dcb_ieee_delapp(netdev, app_data);
1559                         if (err)
1560                                 goto err;
1561                 }
1562         }
1563
1564 err:
1565         err = nla_put_u8(skb, DCB_ATTR_IEEE, err);
1566         dcbnl_ieee_notify(netdev, RTM_SETDCB, DCB_CMD_IEEE_DEL, seq, 0);
1567         return err;
1568 }
1569
1570
1571 /* DCBX configuration */
1572 static int dcbnl_getdcbx(struct net_device *netdev, struct nlmsghdr *nlh,
1573                          u32 seq, struct nlattr **tb, struct sk_buff *skb)
1574 {
1575         if (!netdev->dcbnl_ops->getdcbx)
1576                 return -EOPNOTSUPP;
1577
1578         return nla_put_u8(skb, DCB_ATTR_DCBX,
1579                           netdev->dcbnl_ops->getdcbx(netdev));
1580 }
1581
1582 static int dcbnl_setdcbx(struct net_device *netdev, struct nlmsghdr *nlh,
1583                          u32 seq, struct nlattr **tb, struct sk_buff *skb)
1584 {
1585         u8 value;
1586
1587         if (!netdev->dcbnl_ops->setdcbx)
1588                 return -EOPNOTSUPP;
1589
1590         if (!tb[DCB_ATTR_DCBX])
1591                 return -EINVAL;
1592
1593         value = nla_get_u8(tb[DCB_ATTR_DCBX]);
1594
1595         return nla_put_u8(skb, DCB_ATTR_DCBX,
1596                           netdev->dcbnl_ops->setdcbx(netdev, value));
1597 }
1598
1599 static int dcbnl_getfeatcfg(struct net_device *netdev, struct nlmsghdr *nlh,
1600                             u32 seq, struct nlattr **tb, struct sk_buff *skb)
1601 {
1602         struct nlattr *data[DCB_FEATCFG_ATTR_MAX + 1], *nest;
1603         u8 value;
1604         int ret, i;
1605         int getall = 0;
1606
1607         if (!netdev->dcbnl_ops->getfeatcfg)
1608                 return -EOPNOTSUPP;
1609
1610         if (!tb[DCB_ATTR_FEATCFG])
1611                 return -EINVAL;
1612
1613         ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX,
1614                                tb[DCB_ATTR_FEATCFG], dcbnl_featcfg_nest, NULL);
1615         if (ret)
1616                 return ret;
1617
1618         nest = nla_nest_start(skb, DCB_ATTR_FEATCFG);
1619         if (!nest)
1620                 return -EMSGSIZE;
1621
1622         if (data[DCB_FEATCFG_ATTR_ALL])
1623                 getall = 1;
1624
1625         for (i = DCB_FEATCFG_ATTR_ALL+1; i <= DCB_FEATCFG_ATTR_MAX; i++) {
1626                 if (!getall && !data[i])
1627                         continue;
1628
1629                 ret = netdev->dcbnl_ops->getfeatcfg(netdev, i, &value);
1630                 if (!ret)
1631                         ret = nla_put_u8(skb, i, value);
1632
1633                 if (ret) {
1634                         nla_nest_cancel(skb, nest);
1635                         goto nla_put_failure;
1636                 }
1637         }
1638         nla_nest_end(skb, nest);
1639
1640 nla_put_failure:
1641         return ret;
1642 }
1643
1644 static int dcbnl_setfeatcfg(struct net_device *netdev, struct nlmsghdr *nlh,
1645                             u32 seq, struct nlattr **tb, struct sk_buff *skb)
1646 {
1647         struct nlattr *data[DCB_FEATCFG_ATTR_MAX + 1];
1648         int ret, i;
1649         u8 value;
1650
1651         if (!netdev->dcbnl_ops->setfeatcfg)
1652                 return -ENOTSUPP;
1653
1654         if (!tb[DCB_ATTR_FEATCFG])
1655                 return -EINVAL;
1656
1657         ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX,
1658                                tb[DCB_ATTR_FEATCFG], dcbnl_featcfg_nest, NULL);
1659
1660         if (ret)
1661                 goto err;
1662
1663         for (i = DCB_FEATCFG_ATTR_ALL+1; i <= DCB_FEATCFG_ATTR_MAX; i++) {
1664                 if (data[i] == NULL)
1665                         continue;
1666
1667                 value = nla_get_u8(data[i]);
1668
1669                 ret = netdev->dcbnl_ops->setfeatcfg(netdev, i, value);
1670
1671                 if (ret)
1672                         goto err;
1673         }
1674 err:
1675         ret = nla_put_u8(skb, DCB_ATTR_FEATCFG, ret);
1676
1677         return ret;
1678 }
1679
1680 /* Handle CEE DCBX GET commands. */
1681 static int dcbnl_cee_get(struct net_device *netdev, struct nlmsghdr *nlh,
1682                          u32 seq, struct nlattr **tb, struct sk_buff *skb)
1683 {
1684         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1685
1686         if (!ops)
1687                 return -EOPNOTSUPP;
1688
1689         return dcbnl_cee_fill(skb, netdev);
1690 }
1691
1692 struct reply_func {
1693         /* reply netlink message type */
1694         int     type;
1695
1696         /* function to fill message contents */
1697         int   (*cb)(struct net_device *, struct nlmsghdr *, u32,
1698                     struct nlattr **, struct sk_buff *);
1699 };
1700
1701 static const struct reply_func reply_funcs[DCB_CMD_MAX+1] = {
1702         [DCB_CMD_GSTATE]        = { RTM_GETDCB, dcbnl_getstate },
1703         [DCB_CMD_SSTATE]        = { RTM_SETDCB, dcbnl_setstate },
1704         [DCB_CMD_PFC_GCFG]      = { RTM_GETDCB, dcbnl_getpfccfg },
1705         [DCB_CMD_PFC_SCFG]      = { RTM_SETDCB, dcbnl_setpfccfg },
1706         [DCB_CMD_GPERM_HWADDR]  = { RTM_GETDCB, dcbnl_getperm_hwaddr },
1707         [DCB_CMD_GCAP]          = { RTM_GETDCB, dcbnl_getcap },
1708         [DCB_CMD_GNUMTCS]       = { RTM_GETDCB, dcbnl_getnumtcs },
1709         [DCB_CMD_SNUMTCS]       = { RTM_SETDCB, dcbnl_setnumtcs },
1710         [DCB_CMD_PFC_GSTATE]    = { RTM_GETDCB, dcbnl_getpfcstate },
1711         [DCB_CMD_PFC_SSTATE]    = { RTM_SETDCB, dcbnl_setpfcstate },
1712         [DCB_CMD_GAPP]          = { RTM_GETDCB, dcbnl_getapp },
1713         [DCB_CMD_SAPP]          = { RTM_SETDCB, dcbnl_setapp },
1714         [DCB_CMD_PGTX_GCFG]     = { RTM_GETDCB, dcbnl_pgtx_getcfg },
1715         [DCB_CMD_PGTX_SCFG]     = { RTM_SETDCB, dcbnl_pgtx_setcfg },
1716         [DCB_CMD_PGRX_GCFG]     = { RTM_GETDCB, dcbnl_pgrx_getcfg },
1717         [DCB_CMD_PGRX_SCFG]     = { RTM_SETDCB, dcbnl_pgrx_setcfg },
1718         [DCB_CMD_SET_ALL]       = { RTM_SETDCB, dcbnl_setall },
1719         [DCB_CMD_BCN_GCFG]      = { RTM_GETDCB, dcbnl_bcn_getcfg },
1720         [DCB_CMD_BCN_SCFG]      = { RTM_SETDCB, dcbnl_bcn_setcfg },
1721         [DCB_CMD_IEEE_GET]      = { RTM_GETDCB, dcbnl_ieee_get },
1722         [DCB_CMD_IEEE_SET]      = { RTM_SETDCB, dcbnl_ieee_set },
1723         [DCB_CMD_IEEE_DEL]      = { RTM_SETDCB, dcbnl_ieee_del },
1724         [DCB_CMD_GDCBX]         = { RTM_GETDCB, dcbnl_getdcbx },
1725         [DCB_CMD_SDCBX]         = { RTM_SETDCB, dcbnl_setdcbx },
1726         [DCB_CMD_GFEATCFG]      = { RTM_GETDCB, dcbnl_getfeatcfg },
1727         [DCB_CMD_SFEATCFG]      = { RTM_SETDCB, dcbnl_setfeatcfg },
1728         [DCB_CMD_CEE_GET]       = { RTM_GETDCB, dcbnl_cee_get },
1729 };
1730
1731 static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
1732                     struct netlink_ext_ack *extack)
1733 {
1734         struct net *net = sock_net(skb->sk);
1735         struct net_device *netdev;
1736         struct dcbmsg *dcb = nlmsg_data(nlh);
1737         struct nlattr *tb[DCB_ATTR_MAX + 1];
1738         u32 portid = skb ? NETLINK_CB(skb).portid : 0;
1739         int ret = -EINVAL;
1740         struct sk_buff *reply_skb;
1741         struct nlmsghdr *reply_nlh = NULL;
1742         const struct reply_func *fn;
1743
1744         if ((nlh->nlmsg_type == RTM_SETDCB) && !netlink_capable(skb, CAP_NET_ADMIN))
1745                 return -EPERM;
1746
1747         ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
1748                           dcbnl_rtnl_policy, extack);
1749         if (ret < 0)
1750                 return ret;
1751
1752         if (dcb->cmd > DCB_CMD_MAX)
1753                 return -EINVAL;
1754
1755         /* check if a reply function has been defined for the command */
1756         fn = &reply_funcs[dcb->cmd];
1757         if (!fn->cb)
1758                 return -EOPNOTSUPP;
1759         if (fn->type == RTM_SETDCB && !netlink_capable(skb, CAP_NET_ADMIN))
1760                 return -EPERM;
1761
1762         if (!tb[DCB_ATTR_IFNAME])
1763                 return -EINVAL;
1764
1765         netdev = __dev_get_by_name(net, nla_data(tb[DCB_ATTR_IFNAME]));
1766         if (!netdev)
1767                 return -ENODEV;
1768
1769         if (!netdev->dcbnl_ops)
1770                 return -EOPNOTSUPP;
1771
1772         reply_skb = dcbnl_newmsg(fn->type, dcb->cmd, portid, nlh->nlmsg_seq,
1773                                  nlh->nlmsg_flags, &reply_nlh);
1774         if (!reply_skb)
1775                 return -ENOBUFS;
1776
1777         ret = fn->cb(netdev, nlh, nlh->nlmsg_seq, tb, reply_skb);
1778         if (ret < 0) {
1779                 nlmsg_free(reply_skb);
1780                 goto out;
1781         }
1782
1783         nlmsg_end(reply_skb, reply_nlh);
1784
1785         ret = rtnl_unicast(reply_skb, net, portid);
1786 out:
1787         return ret;
1788 }
1789
1790 static struct dcb_app_type *dcb_app_lookup(const struct dcb_app *app,
1791                                            int ifindex, int prio)
1792 {
1793         struct dcb_app_type *itr;
1794
1795         list_for_each_entry(itr, &dcb_app_list, list) {
1796                 if (itr->app.selector == app->selector &&
1797                     itr->app.protocol == app->protocol &&
1798                     itr->ifindex == ifindex &&
1799                     ((prio == -1) || itr->app.priority == prio))
1800                         return itr;
1801         }
1802
1803         return NULL;
1804 }
1805
1806 static int dcb_app_add(const struct dcb_app *app, int ifindex)
1807 {
1808         struct dcb_app_type *entry;
1809
1810         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
1811         if (!entry)
1812                 return -ENOMEM;
1813
1814         memcpy(&entry->app, app, sizeof(*app));
1815         entry->ifindex = ifindex;
1816         list_add(&entry->list, &dcb_app_list);
1817
1818         return 0;
1819 }
1820
1821 /**
1822  * dcb_getapp - retrieve the DCBX application user priority
1823  *
1824  * On success returns a non-zero 802.1p user priority bitmap
1825  * otherwise returns 0 as the invalid user priority bitmap to
1826  * indicate an error.
1827  */
1828 u8 dcb_getapp(struct net_device *dev, struct dcb_app *app)
1829 {
1830         struct dcb_app_type *itr;
1831         u8 prio = 0;
1832
1833         spin_lock_bh(&dcb_lock);
1834         itr = dcb_app_lookup(app, dev->ifindex, -1);
1835         if (itr)
1836                 prio = itr->app.priority;
1837         spin_unlock_bh(&dcb_lock);
1838
1839         return prio;
1840 }
1841 EXPORT_SYMBOL(dcb_getapp);
1842
1843 /**
1844  * dcb_setapp - add CEE dcb application data to app list
1845  *
1846  * Priority 0 is an invalid priority in CEE spec. This routine
1847  * removes applications from the app list if the priority is
1848  * set to zero. Priority is expected to be 8-bit 802.1p user priority bitmap
1849  */
1850 int dcb_setapp(struct net_device *dev, struct dcb_app *new)
1851 {
1852         struct dcb_app_type *itr;
1853         struct dcb_app_type event;
1854         int err = 0;
1855
1856         event.ifindex = dev->ifindex;
1857         memcpy(&event.app, new, sizeof(event.app));
1858         if (dev->dcbnl_ops->getdcbx)
1859                 event.dcbx = dev->dcbnl_ops->getdcbx(dev);
1860
1861         spin_lock_bh(&dcb_lock);
1862         /* Search for existing match and replace */
1863         itr = dcb_app_lookup(new, dev->ifindex, -1);
1864         if (itr) {
1865                 if (new->priority)
1866                         itr->app.priority = new->priority;
1867                 else {
1868                         list_del(&itr->list);
1869                         kfree(itr);
1870                 }
1871                 goto out;
1872         }
1873         /* App type does not exist add new application type */
1874         if (new->priority)
1875                 err = dcb_app_add(new, dev->ifindex);
1876 out:
1877         spin_unlock_bh(&dcb_lock);
1878         if (!err)
1879                 call_dcbevent_notifiers(DCB_APP_EVENT, &event);
1880         return err;
1881 }
1882 EXPORT_SYMBOL(dcb_setapp);
1883
1884 /**
1885  * dcb_ieee_getapp_mask - retrieve the IEEE DCB application priority
1886  *
1887  * Helper routine which on success returns a non-zero 802.1Qaz user
1888  * priority bitmap otherwise returns 0 to indicate the dcb_app was
1889  * not found in APP list.
1890  */
1891 u8 dcb_ieee_getapp_mask(struct net_device *dev, struct dcb_app *app)
1892 {
1893         struct dcb_app_type *itr;
1894         u8 prio = 0;
1895
1896         spin_lock_bh(&dcb_lock);
1897         itr = dcb_app_lookup(app, dev->ifindex, -1);
1898         if (itr)
1899                 prio |= 1 << itr->app.priority;
1900         spin_unlock_bh(&dcb_lock);
1901
1902         return prio;
1903 }
1904 EXPORT_SYMBOL(dcb_ieee_getapp_mask);
1905
1906 /**
1907  * dcb_ieee_setapp - add IEEE dcb application data to app list
1908  *
1909  * This adds Application data to the list. Multiple application
1910  * entries may exists for the same selector and protocol as long
1911  * as the priorities are different. Priority is expected to be a
1912  * 3-bit unsigned integer
1913  */
1914 int dcb_ieee_setapp(struct net_device *dev, struct dcb_app *new)
1915 {
1916         struct dcb_app_type event;
1917         int err = 0;
1918
1919         event.ifindex = dev->ifindex;
1920         memcpy(&event.app, new, sizeof(event.app));
1921         if (dev->dcbnl_ops->getdcbx)
1922                 event.dcbx = dev->dcbnl_ops->getdcbx(dev);
1923
1924         spin_lock_bh(&dcb_lock);
1925         /* Search for existing match and abort if found */
1926         if (dcb_app_lookup(new, dev->ifindex, new->priority)) {
1927                 err = -EEXIST;
1928                 goto out;
1929         }
1930
1931         err = dcb_app_add(new, dev->ifindex);
1932 out:
1933         spin_unlock_bh(&dcb_lock);
1934         if (!err)
1935                 call_dcbevent_notifiers(DCB_APP_EVENT, &event);
1936         return err;
1937 }
1938 EXPORT_SYMBOL(dcb_ieee_setapp);
1939
1940 /**
1941  * dcb_ieee_delapp - delete IEEE dcb application data from list
1942  *
1943  * This removes a matching APP data from the APP list
1944  */
1945 int dcb_ieee_delapp(struct net_device *dev, struct dcb_app *del)
1946 {
1947         struct dcb_app_type *itr;
1948         struct dcb_app_type event;
1949         int err = -ENOENT;
1950
1951         event.ifindex = dev->ifindex;
1952         memcpy(&event.app, del, sizeof(event.app));
1953         if (dev->dcbnl_ops->getdcbx)
1954                 event.dcbx = dev->dcbnl_ops->getdcbx(dev);
1955
1956         spin_lock_bh(&dcb_lock);
1957         /* Search for existing match and remove it. */
1958         if ((itr = dcb_app_lookup(del, dev->ifindex, del->priority))) {
1959                 list_del(&itr->list);
1960                 kfree(itr);
1961                 err = 0;
1962         }
1963
1964         spin_unlock_bh(&dcb_lock);
1965         if (!err)
1966                 call_dcbevent_notifiers(DCB_APP_EVENT, &event);
1967         return err;
1968 }
1969 EXPORT_SYMBOL(dcb_ieee_delapp);
1970
1971 /**
1972  * dcb_ieee_getapp_prio_dscp_mask_map - For a given device, find mapping from
1973  * priorities to the DSCP values assigned to that priority. Initialize p_map
1974  * such that each map element holds a bit mask of DSCP values configured for
1975  * that priority by APP entries.
1976  */
1977 void dcb_ieee_getapp_prio_dscp_mask_map(const struct net_device *dev,
1978                                         struct dcb_ieee_app_prio_map *p_map)
1979 {
1980         int ifindex = dev->ifindex;
1981         struct dcb_app_type *itr;
1982         u8 prio;
1983
1984         memset(p_map->map, 0, sizeof(p_map->map));
1985
1986         spin_lock_bh(&dcb_lock);
1987         list_for_each_entry(itr, &dcb_app_list, list) {
1988                 if (itr->ifindex == ifindex &&
1989                     itr->app.selector == IEEE_8021QAZ_APP_SEL_DSCP &&
1990                     itr->app.protocol < 64 &&
1991                     itr->app.priority < IEEE_8021QAZ_MAX_TCS) {
1992                         prio = itr->app.priority;
1993                         p_map->map[prio] |= 1ULL << itr->app.protocol;
1994                 }
1995         }
1996         spin_unlock_bh(&dcb_lock);
1997 }
1998 EXPORT_SYMBOL(dcb_ieee_getapp_prio_dscp_mask_map);
1999
2000 /**
2001  * dcb_ieee_getapp_dscp_prio_mask_map - For a given device, find mapping from
2002  * DSCP values to the priorities assigned to that DSCP value. Initialize p_map
2003  * such that each map element holds a bit mask of priorities configured for a
2004  * given DSCP value by APP entries.
2005  */
2006 void
2007 dcb_ieee_getapp_dscp_prio_mask_map(const struct net_device *dev,
2008                                    struct dcb_ieee_app_dscp_map *p_map)
2009 {
2010         int ifindex = dev->ifindex;
2011         struct dcb_app_type *itr;
2012
2013         memset(p_map->map, 0, sizeof(p_map->map));
2014
2015         spin_lock_bh(&dcb_lock);
2016         list_for_each_entry(itr, &dcb_app_list, list) {
2017                 if (itr->ifindex == ifindex &&
2018                     itr->app.selector == IEEE_8021QAZ_APP_SEL_DSCP &&
2019                     itr->app.protocol < 64 &&
2020                     itr->app.priority < IEEE_8021QAZ_MAX_TCS)
2021                         p_map->map[itr->app.protocol] |= 1 << itr->app.priority;
2022         }
2023         spin_unlock_bh(&dcb_lock);
2024 }
2025 EXPORT_SYMBOL(dcb_ieee_getapp_dscp_prio_mask_map);
2026
2027 /**
2028  * Per 802.1Q-2014, the selector value of 1 is used for matching on Ethernet
2029  * type, with valid PID values >= 1536. A special meaning is then assigned to
2030  * protocol value of 0: "default priority. For use when priority is not
2031  * otherwise specified".
2032  *
2033  * dcb_ieee_getapp_default_prio_mask - For a given device, find all APP entries
2034  * of the form {$PRIO, ETHERTYPE, 0} and construct a bit mask of all default
2035  * priorities set by these entries.
2036  */
2037 u8 dcb_ieee_getapp_default_prio_mask(const struct net_device *dev)
2038 {
2039         int ifindex = dev->ifindex;
2040         struct dcb_app_type *itr;
2041         u8 mask = 0;
2042
2043         spin_lock_bh(&dcb_lock);
2044         list_for_each_entry(itr, &dcb_app_list, list) {
2045                 if (itr->ifindex == ifindex &&
2046                     itr->app.selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
2047                     itr->app.protocol == 0 &&
2048                     itr->app.priority < IEEE_8021QAZ_MAX_TCS)
2049                         mask |= 1 << itr->app.priority;
2050         }
2051         spin_unlock_bh(&dcb_lock);
2052
2053         return mask;
2054 }
2055 EXPORT_SYMBOL(dcb_ieee_getapp_default_prio_mask);
2056
2057 static void dcbnl_flush_dev(struct net_device *dev)
2058 {
2059         struct dcb_app_type *itr, *tmp;
2060
2061         spin_lock_bh(&dcb_lock);
2062
2063         list_for_each_entry_safe(itr, tmp, &dcb_app_list, list) {
2064                 if (itr->ifindex == dev->ifindex) {
2065                         list_del(&itr->list);
2066                         kfree(itr);
2067                 }
2068         }
2069
2070         spin_unlock_bh(&dcb_lock);
2071 }
2072
2073 static int dcbnl_netdevice_event(struct notifier_block *nb,
2074                                  unsigned long event, void *ptr)
2075 {
2076         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2077
2078         switch (event) {
2079         case NETDEV_UNREGISTER:
2080                 if (!dev->dcbnl_ops)
2081                         return NOTIFY_DONE;
2082
2083                 dcbnl_flush_dev(dev);
2084
2085                 return NOTIFY_OK;
2086         default:
2087                 return NOTIFY_DONE;
2088         }
2089 }
2090
2091 static struct notifier_block dcbnl_nb __read_mostly = {
2092         .notifier_call  = dcbnl_netdevice_event,
2093 };
2094
2095 static int __init dcbnl_init(void)
2096 {
2097         int err;
2098
2099         INIT_LIST_HEAD(&dcb_app_list);
2100
2101         err = register_netdevice_notifier(&dcbnl_nb);
2102         if (err)
2103                 return err;
2104
2105         rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL, 0);
2106         rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL, 0);
2107
2108         return 0;
2109 }
2110 device_initcall(dcbnl_init);