net/dcb/dcbnl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2008-2011, Intel Corporation.
   4  *
   5  * Description: Data Center Bridging netlink interface
   6  * Author: Lucy Liu <lucy.liu@intel.com>
   7  */
   8
   9 #include <linux/netdevice.h>
  10 #include <linux/netlink.h>
  11 #include <linux/slab.h>
  12 #include <net/netlink.h>
  13 #include <net/rtnetlink.h>
  14 #include <linux/dcbnl.h>
  15 #include <net/dcbevent.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/init.h>
  18 #include <net/sock.h>
  19
  20 /* Data Center Bridging (DCB) is a collection of Ethernet enhancements
  21  * intended to allow network traffic with differing requirements
  22  * (highly reliable, no drops vs. best effort vs. low latency) to operate
  23  * and co-exist on Ethernet.  Current DCB features are:
  24  *
  25  * Enhanced Transmission Selection (aka Priority Grouping [PG]) - provides a
  26  *   framework for assigning bandwidth guarantees to traffic classes.
  27  *
  28  * Priority-based Flow Control (PFC) - provides a flow control mechanism which
  29  *   can work independently for each 802.1p priority.
  30  *
  31  * Congestion Notification - provides a mechanism for end-to-end congestion
  32  *   control for protocols which do not have built-in congestion management.
  33  *
  34  * More information about the emerging standards for these Ethernet features
  35  * can be found at: http://www.ieee802.org/1/pages/dcbridges.html
  36  *
  37  * This file implements an rtnetlink interface to allow configuration of DCB
  38  * features for capable devices.
  39  */
  40
  41 /**************** DCB attribute policies *************************************/
  42
  43 /* DCB netlink attributes policy */
  44 static const struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {
  45         [DCB_ATTR_IFNAME]      = {.type = NLA_NUL_STRING, .len = IFNAMSIZ - 1},
  46         [DCB_ATTR_STATE]       = {.type = NLA_U8},
  47         [DCB_ATTR_PFC_CFG]     = {.type = NLA_NESTED},
  48         [DCB_ATTR_PG_CFG]      = {.type = NLA_NESTED},
  49         [DCB_ATTR_SET_ALL]     = {.type = NLA_U8},
  50         [DCB_ATTR_PERM_HWADDR] = {.type = NLA_FLAG},
  51         [DCB_ATTR_CAP]         = {.type = NLA_NESTED},
  52         [DCB_ATTR_PFC_STATE]   = {.type = NLA_U8},
  53         [DCB_ATTR_BCN]         = {.type = NLA_NESTED},
  54         [DCB_ATTR_APP]         = {.type = NLA_NESTED},
  55         [DCB_ATTR_IEEE]        = {.type = NLA_NESTED},
  56         [DCB_ATTR_DCBX]        = {.type = NLA_U8},
  57         [DCB_ATTR_FEATCFG]     = {.type = NLA_NESTED},
  58 };
  59
  60 /* DCB priority flow control to User Priority nested attributes */
  61 static const struct nla_policy dcbnl_pfc_up_nest[DCB_PFC_UP_ATTR_MAX + 1] = {
  62         [DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},
  63         [DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},
  64         [DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},
  65         [DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},
  66         [DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},
  67         [DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},
  68         [DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},
  69         [DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},
  70         [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},
  71 };
  72
  73 /* DCB priority grouping nested attributes */
  74 static const struct nla_policy dcbnl_pg_nest[DCB_PG_ATTR_MAX + 1] = {
  75         [DCB_PG_ATTR_TC_0]      = {.type = NLA_NESTED},
  76         [DCB_PG_ATTR_TC_1]      = {.type = NLA_NESTED},
  77         [DCB_PG_ATTR_TC_2]      = {.type = NLA_NESTED},
  78         [DCB_PG_ATTR_TC_3]      = {.type = NLA_NESTED},
  79         [DCB_PG_ATTR_TC_4]      = {.type = NLA_NESTED},
  80         [DCB_PG_ATTR_TC_5]      = {.type = NLA_NESTED},
  81         [DCB_PG_ATTR_TC_6]      = {.type = NLA_NESTED},
  82         [DCB_PG_ATTR_TC_7]      = {.type = NLA_NESTED},
  83         [DCB_PG_ATTR_TC_ALL]    = {.type = NLA_NESTED},
  84         [DCB_PG_ATTR_BW_ID_0]   = {.type = NLA_U8},
  85         [DCB_PG_ATTR_BW_ID_1]   = {.type = NLA_U8},
  86         [DCB_PG_ATTR_BW_ID_2]   = {.type = NLA_U8},
  87         [DCB_PG_ATTR_BW_ID_3]   = {.type = NLA_U8},
  88         [DCB_PG_ATTR_BW_ID_4]   = {.type = NLA_U8},
  89         [DCB_PG_ATTR_BW_ID_5]   = {.type = NLA_U8},
  90         [DCB_PG_ATTR_BW_ID_6]   = {.type = NLA_U8},
  91         [DCB_PG_ATTR_BW_ID_7]   = {.type = NLA_U8},
  92         [DCB_PG_ATTR_BW_ID_ALL] = {.type = NLA_FLAG},
  93 };
  94
  95 /* DCB traffic class nested attributes. */
  96 static const struct nla_policy dcbnl_tc_param_nest[DCB_TC_ATTR_PARAM_MAX + 1] = {
  97         [DCB_TC_ATTR_PARAM_PGID]            = {.type = NLA_U8},
  98         [DCB_TC_ATTR_PARAM_UP_MAPPING]      = {.type = NLA_U8},
  99         [DCB_TC_ATTR_PARAM_STRICT_PRIO]     = {.type = NLA_U8},
 100         [DCB_TC_ATTR_PARAM_BW_PCT]          = {.type = NLA_U8},
 101         [DCB_TC_ATTR_PARAM_ALL]             = {.type = NLA_FLAG},
 102 };
 103
 104 /* DCB capabilities nested attributes. */
 105 static const struct nla_policy dcbnl_cap_nest[DCB_CAP_ATTR_MAX + 1] = {
 106         [DCB_CAP_ATTR_ALL]     = {.type = NLA_FLAG},
 107         [DCB_CAP_ATTR_PG]      = {.type = NLA_U8},
 108         [DCB_CAP_ATTR_PFC]     = {.type = NLA_U8},
 109         [DCB_CAP_ATTR_UP2TC]   = {.type = NLA_U8},
 110         [DCB_CAP_ATTR_PG_TCS]  = {.type = NLA_U8},
 111         [DCB_CAP_ATTR_PFC_TCS] = {.type = NLA_U8},
 112         [DCB_CAP_ATTR_GSP]     = {.type = NLA_U8},
 113         [DCB_CAP_ATTR_BCN]     = {.type = NLA_U8},
 114         [DCB_CAP_ATTR_DCBX]    = {.type = NLA_U8},
 115 };
 116
 117 /* DCB capabilities nested attributes. */
 118 static const struct nla_policy dcbnl_numtcs_nest[DCB_NUMTCS_ATTR_MAX + 1] = {
 119         [DCB_NUMTCS_ATTR_ALL]     = {.type = NLA_FLAG},
 120         [DCB_NUMTCS_ATTR_PG]      = {.type = NLA_U8},
 121         [DCB_NUMTCS_ATTR_PFC]     = {.type = NLA_U8},
 122 };
 123
 124 /* DCB BCN nested attributes. */
 125 static const struct nla_policy dcbnl_bcn_nest[DCB_BCN_ATTR_MAX + 1] = {
 126         [DCB_BCN_ATTR_RP_0]         = {.type = NLA_U8},
 127         [DCB_BCN_ATTR_RP_1]         = {.type = NLA_U8},
 128         [DCB_BCN_ATTR_RP_2]         = {.type = NLA_U8},
 129         [DCB_BCN_ATTR_RP_3]         = {.type = NLA_U8},
 130         [DCB_BCN_ATTR_RP_4]         = {.type = NLA_U8},
 131         [DCB_BCN_ATTR_RP_5]         = {.type = NLA_U8},
 132         [DCB_BCN_ATTR_RP_6]         = {.type = NLA_U8},
 133         [DCB_BCN_ATTR_RP_7]         = {.type = NLA_U8},
 134         [DCB_BCN_ATTR_RP_ALL]       = {.type = NLA_FLAG},
 135         [DCB_BCN_ATTR_BCNA_0]       = {.type = NLA_U32},
 136         [DCB_BCN_ATTR_BCNA_1]       = {.type = NLA_U32},
 137         [DCB_BCN_ATTR_ALPHA]        = {.type = NLA_U32},
 138         [DCB_BCN_ATTR_BETA]         = {.type = NLA_U32},
 139         [DCB_BCN_ATTR_GD]           = {.type = NLA_U32},
 140         [DCB_BCN_ATTR_GI]           = {.type = NLA_U32},
 141         [DCB_BCN_ATTR_TMAX]         = {.type = NLA_U32},
 142         [DCB_BCN_ATTR_TD]           = {.type = NLA_U32},
 143         [DCB_BCN_ATTR_RMIN]         = {.type = NLA_U32},
 144         [DCB_BCN_ATTR_W]            = {.type = NLA_U32},
 145         [DCB_BCN_ATTR_RD]           = {.type = NLA_U32},
 146         [DCB_BCN_ATTR_RU]           = {.type = NLA_U32},
 147         [DCB_BCN_ATTR_WRTT]         = {.type = NLA_U32},
 148         [DCB_BCN_ATTR_RI]           = {.type = NLA_U32},
 149         [DCB_BCN_ATTR_C]            = {.type = NLA_U32},
 150         [DCB_BCN_ATTR_ALL]          = {.type = NLA_FLAG},
 151 };
 152
 153 /* DCB APP nested attributes. */
 154 static const struct nla_policy dcbnl_app_nest[DCB_APP_ATTR_MAX + 1] = {
 155         [DCB_APP_ATTR_IDTYPE]       = {.type = NLA_U8},
 156         [DCB_APP_ATTR_ID]           = {.type = NLA_U16},
 157         [DCB_APP_ATTR_PRIORITY]     = {.type = NLA_U8},
 158 };
 159
 160 /* IEEE 802.1Qaz nested attributes. */
 161 static const struct nla_policy dcbnl_ieee_policy[DCB_ATTR_IEEE_MAX + 1] = {
 162         [DCB_ATTR_IEEE_ETS]         = {.len = sizeof(struct ieee_ets)},
 163         [DCB_ATTR_IEEE_PFC]         = {.len = sizeof(struct ieee_pfc)},
 164         [DCB_ATTR_IEEE_APP_TABLE]   = {.type = NLA_NESTED},
 165         [DCB_ATTR_IEEE_MAXRATE]   = {.len = sizeof(struct ieee_maxrate)},
 166         [DCB_ATTR_IEEE_QCN]         = {.len = sizeof(struct ieee_qcn)},
 167         [DCB_ATTR_IEEE_QCN_STATS]   = {.len = sizeof(struct ieee_qcn_stats)},
 168         [DCB_ATTR_DCB_BUFFER]       = {.len = sizeof(struct dcbnl_buffer)},
 169 };
 170
 171 /* DCB number of traffic classes nested attributes. */
 172 static const struct nla_policy dcbnl_featcfg_nest[DCB_FEATCFG_ATTR_MAX + 1] = {
 173         [DCB_FEATCFG_ATTR_ALL]      = {.type = NLA_FLAG},
 174         [DCB_FEATCFG_ATTR_PG]       = {.type = NLA_U8},
 175         [DCB_FEATCFG_ATTR_PFC]      = {.type = NLA_U8},
 176         [DCB_FEATCFG_ATTR_APP]      = {.type = NLA_U8},
 177 };
 178
 179 static LIST_HEAD(dcb_app_list);
 180 static DEFINE_SPINLOCK(dcb_lock);
 181
 182 static struct sk_buff *dcbnl_newmsg(int type, u8 cmd, u32 port, u32 seq,
 183                                     u32 flags, struct nlmsghdr **nlhp)
 184 {
 185         struct sk_buff *skb;
 186         struct dcbmsg *dcb;
 187         struct nlmsghdr *nlh;
 188
 189         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 190         if (!skb)
 191                 return NULL;
 192
 193         nlh = nlmsg_put(skb, port, seq, type, sizeof(*dcb), flags);
 194         BUG_ON(!nlh);
 195
 196         dcb = nlmsg_data(nlh);
 197         dcb->dcb_family = AF_UNSPEC;
 198         dcb->cmd = cmd;
 199         dcb->dcb_pad = 0;
 200
 201         if (nlhp)
 202                 *nlhp = nlh;
 203
 204         return skb;
 205 }
 206
 207 static int dcbnl_getstate(struct net_device *netdev, struct nlmsghdr *nlh,
 208                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
 209 {
 210         /* if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->getstate) */
 211         if (!netdev->dcbnl_ops->getstate)
 212                 return -EOPNOTSUPP;
 213
 214         return nla_put_u8(skb, DCB_ATTR_STATE,
 215                           netdev->dcbnl_ops->getstate(netdev));
 216 }
 217
 218 static int dcbnl_getpfccfg(struct net_device *netdev, struct nlmsghdr *nlh,
 219                            u32 seq, struct nlattr **tb, struct sk_buff *skb)
 220 {
 221         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1], *nest;
 222         u8 value;
 223         int ret;
 224         int i;
 225         int getall = 0;
 226
 227         if (!tb[DCB_ATTR_PFC_CFG])
 228                 return -EINVAL;
 229
 230         if (!netdev->dcbnl_ops->getpfccfg)
 231                 return -EOPNOTSUPP;
 232
 233         ret = nla_parse_nested_deprecated(data, DCB_PFC_UP_ATTR_MAX,
 234                                           tb[DCB_ATTR_PFC_CFG],
 235                                           dcbnl_pfc_up_nest, NULL);
 236         if (ret)
 237                 return ret;
 238
 239         nest = nla_nest_start_noflag(skb, DCB_ATTR_PFC_CFG);
 240         if (!nest)
 241                 return -EMSGSIZE;
 242
 243         if (data[DCB_PFC_UP_ATTR_ALL])
 244                 getall = 1;
 245
 246         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 247                 if (!getall && !data[i])
 248                         continue;
 249
 250                 netdev->dcbnl_ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0,
 251                                              &value);
 252                 ret = nla_put_u8(skb, i, value);
 253                 if (ret) {
 254                         nla_nest_cancel(skb, nest);
 255                         return ret;
 256                 }
 257         }
 258         nla_nest_end(skb, nest);
 259
 260         return 0;
 261 }
 262
 263 static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlmsghdr *nlh,
 264                                 u32 seq, struct nlattr **tb, struct sk_buff *skb)
 265 {
 266         u8 perm_addr[MAX_ADDR_LEN];
 267
 268         if (!netdev->dcbnl_ops->getpermhwaddr)
 269                 return -EOPNOTSUPP;
 270
 271         memset(perm_addr, 0, sizeof(perm_addr));
 272         netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);
 273
 274         return nla_put(skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr), perm_addr);
 275 }
 276
 277 static int dcbnl_getcap(struct net_device *netdev, struct nlmsghdr *nlh,
 278                         u32 seq, struct nlattr **tb, struct sk_buff *skb)
 279 {
 280         struct nlattr *data[DCB_CAP_ATTR_MAX + 1], *nest;
 281         u8 value;
 282         int ret;
 283         int i;
 284         int getall = 0;
 285
 286         if (!tb[DCB_ATTR_CAP])
 287                 return -EINVAL;
 288
 289         if (!netdev->dcbnl_ops->getcap)
 290                 return -EOPNOTSUPP;
 291
 292         ret = nla_parse_nested_deprecated(data, DCB_CAP_ATTR_MAX,
 293                                           tb[DCB_ATTR_CAP], dcbnl_cap_nest,
 294                                           NULL);
 295         if (ret)
 296                 return ret;
 297
 298         nest = nla_nest_start_noflag(skb, DCB_ATTR_CAP);
 299         if (!nest)
 300                 return -EMSGSIZE;
 301
 302         if (data[DCB_CAP_ATTR_ALL])
 303                 getall = 1;
 304
 305         for (i = DCB_CAP_ATTR_ALL+1; i <= DCB_CAP_ATTR_MAX; i++) {
 306                 if (!getall && !data[i])
 307                         continue;
 308
 309                 if (!netdev->dcbnl_ops->getcap(netdev, i, &value)) {
 310                         ret = nla_put_u8(skb, i, value);
 311                         if (ret) {
 312                                 nla_nest_cancel(skb, nest);
 313                                 return ret;
 314                         }
 315                 }
 316         }
 317         nla_nest_end(skb, nest);
 318
 319         return 0;
 320 }
 321
 322 static int dcbnl_getnumtcs(struct net_device *netdev, struct nlmsghdr *nlh,
 323                            u32 seq, struct nlattr **tb, struct sk_buff *skb)
 324 {
 325         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1], *nest;
 326         u8 value;
 327         int ret;
 328         int i;
 329         int getall = 0;
 330
 331         if (!tb[DCB_ATTR_NUMTCS])
 332                 return -EINVAL;
 333
 334         if (!netdev->dcbnl_ops->getnumtcs)
 335                 return -EOPNOTSUPP;
 336
 337         ret = nla_parse_nested_deprecated(data, DCB_NUMTCS_ATTR_MAX,
 338                                           tb[DCB_ATTR_NUMTCS],
 339                                           dcbnl_numtcs_nest, NULL);
 340         if (ret)
 341                 return ret;
 342
 343         nest = nla_nest_start_noflag(skb, DCB_ATTR_NUMTCS);
 344         if (!nest)
 345                 return -EMSGSIZE;
 346
 347         if (data[DCB_NUMTCS_ATTR_ALL])
 348                 getall = 1;
 349
 350         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
 351                 if (!getall && !data[i])
 352                         continue;
 353
 354                 ret = netdev->dcbnl_ops->getnumtcs(netdev, i, &value);
 355                 if (!ret) {
 356                         ret = nla_put_u8(skb, i, value);
 357                         if (ret) {
 358                                 nla_nest_cancel(skb, nest);
 359                                 return ret;
 360                         }
 361                 } else
 362                         return -EINVAL;
 363         }
 364         nla_nest_end(skb, nest);
 365
 366         return 0;
 367 }
 368
 369 static int dcbnl_setnumtcs(struct net_device *netdev, struct nlmsghdr *nlh,
 370                            u32 seq, struct nlattr **tb, struct sk_buff *skb)
 371 {
 372         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1];
 373         int ret;
 374         u8 value;
 375         int i;
 376
 377         if (!tb[DCB_ATTR_NUMTCS])
 378                 return -EINVAL;
 379
 380         if (!netdev->dcbnl_ops->setnumtcs)
 381                 return -EOPNOTSUPP;
 382
 383         ret = nla_parse_nested_deprecated(data, DCB_NUMTCS_ATTR_MAX,
 384                                           tb[DCB_ATTR_NUMTCS],
 385                                           dcbnl_numtcs_nest, NULL);
 386         if (ret)
 387                 return ret;
 388
 389         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
 390                 if (data[i] == NULL)
 391                         continue;
 392
 393                 value = nla_get_u8(data[i]);
 394
 395                 ret = netdev->dcbnl_ops->setnumtcs(netdev, i, value);
 396                 if (ret)
 397                         break;
 398         }
 399
 400         return nla_put_u8(skb, DCB_ATTR_NUMTCS, !!ret);
 401 }
 402
 403 static int dcbnl_getpfcstate(struct net_device *netdev, struct nlmsghdr *nlh,
 404                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 405 {
 406         if (!netdev->dcbnl_ops->getpfcstate)
 407                 return -EOPNOTSUPP;
 408
 409         return nla_put_u8(skb, DCB_ATTR_PFC_STATE,
 410                           netdev->dcbnl_ops->getpfcstate(netdev));
 411 }
 412
 413 static int dcbnl_setpfcstate(struct net_device *netdev, struct nlmsghdr *nlh,
 414                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 415 {
 416         u8 value;
 417
 418         if (!tb[DCB_ATTR_PFC_STATE])
 419                 return -EINVAL;
 420
 421         if (!netdev->dcbnl_ops->setpfcstate)
 422                 return -EOPNOTSUPP;
 423
 424         value = nla_get_u8(tb[DCB_ATTR_PFC_STATE]);
 425
 426         netdev->dcbnl_ops->setpfcstate(netdev, value);
 427
 428         return nla_put_u8(skb, DCB_ATTR_PFC_STATE, 0);
 429 }
 430
 431 static int dcbnl_getapp(struct net_device *netdev, struct nlmsghdr *nlh,
 432                         u32 seq, struct nlattr **tb, struct sk_buff *skb)
 433 {
 434         struct nlattr *app_nest;
 435         struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1];
 436         u16 id;
 437         u8 up, idtype;
 438         int ret;
 439
 440         if (!tb[DCB_ATTR_APP])
 441                 return -EINVAL;
 442
 443         ret = nla_parse_nested_deprecated(app_tb, DCB_APP_ATTR_MAX,
 444                                           tb[DCB_ATTR_APP], dcbnl_app_nest,
 445                                           NULL);
 446         if (ret)
 447                 return ret;
 448
 449         /* all must be non-null */
 450         if ((!app_tb[DCB_APP_ATTR_IDTYPE]) ||
 451             (!app_tb[DCB_APP_ATTR_ID]))
 452                 return -EINVAL;
 453
 454         /* either by eth type or by socket number */
 455         idtype = nla_get_u8(app_tb[DCB_APP_ATTR_IDTYPE]);
 456         if ((idtype != DCB_APP_IDTYPE_ETHTYPE) &&
 457             (idtype != DCB_APP_IDTYPE_PORTNUM))
 458                 return -EINVAL;
 459
 460         id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]);
 461
 462         if (netdev->dcbnl_ops->getapp) {
 463                 ret = netdev->dcbnl_ops->getapp(netdev, idtype, id);
 464                 if (ret < 0)
 465                         return ret;
 466                 else
 467                         up = ret;
 468         } else {
 469                 struct dcb_app app = {
 470                                         .selector = idtype,
 471                                         .protocol = id,
 472                                      };
 473                 up = dcb_getapp(netdev, &app);
 474         }
 475
 476         app_nest = nla_nest_start_noflag(skb, DCB_ATTR_APP);
 477         if (!app_nest)
 478                 return -EMSGSIZE;
 479
 480         ret = nla_put_u8(skb, DCB_APP_ATTR_IDTYPE, idtype);
 481         if (ret)
 482                 goto out_cancel;
 483
 484         ret = nla_put_u16(skb, DCB_APP_ATTR_ID, id);
 485         if (ret)
 486                 goto out_cancel;
 487
 488         ret = nla_put_u8(skb, DCB_APP_ATTR_PRIORITY, up);
 489         if (ret)
 490                 goto out_cancel;
 491
 492         nla_nest_end(skb, app_nest);
 493
 494         return 0;
 495
 496 out_cancel:
 497         nla_nest_cancel(skb, app_nest);
 498         return ret;
 499 }
 500
 501 static int dcbnl_setapp(struct net_device *netdev, struct nlmsghdr *nlh,
 502                         u32 seq, struct nlattr **tb, struct sk_buff *skb)
 503 {
 504         int ret;
 505         u16 id;
 506         u8 up, idtype;
 507         struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1];
 508
 509         if (!tb[DCB_ATTR_APP])
 510                 return -EINVAL;
 511
 512         ret = nla_parse_nested_deprecated(app_tb, DCB_APP_ATTR_MAX,
 513                                           tb[DCB_ATTR_APP], dcbnl_app_nest,
 514                                           NULL);
 515         if (ret)
 516                 return ret;
 517
 518         /* all must be non-null */
 519         if ((!app_tb[DCB_APP_ATTR_IDTYPE]) ||
 520             (!app_tb[DCB_APP_ATTR_ID]) ||
 521             (!app_tb[DCB_APP_ATTR_PRIORITY]))
 522                 return -EINVAL;
 523
 524         /* either by eth type or by socket number */
 525         idtype = nla_get_u8(app_tb[DCB_APP_ATTR_IDTYPE]);
 526         if ((idtype != DCB_APP_IDTYPE_ETHTYPE) &&
 527             (idtype != DCB_APP_IDTYPE_PORTNUM))
 528                 return -EINVAL;
 529
 530         id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]);
 531         up = nla_get_u8(app_tb[DCB_APP_ATTR_PRIORITY]);
 532
 533         if (netdev->dcbnl_ops->setapp) {
 534                 ret = netdev->dcbnl_ops->setapp(netdev, idtype, id, up);
 535                 if (ret < 0)
 536                         return ret;
 537         } else {
 538                 struct dcb_app app;
 539                 app.selector = idtype;
 540                 app.protocol = id;
 541                 app.priority = up;
 542                 ret = dcb_setapp(netdev, &app);
 543         }
 544
 545         ret = nla_put_u8(skb, DCB_ATTR_APP, ret);
 546         dcbnl_cee_notify(netdev, RTM_SETDCB, DCB_CMD_SAPP, seq, 0);
 547
 548         return ret;
 549 }
 550
 551 static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 552                              struct nlattr **tb, struct sk_buff *skb, int dir)
 553 {
 554         struct nlattr *pg_nest, *param_nest, *data;
 555         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 556         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 557         u8 prio, pgid, tc_pct, up_map;
 558         int ret;
 559         int getall = 0;
 560         int i;
 561
 562         if (!tb[DCB_ATTR_PG_CFG])
 563                 return -EINVAL;
 564
 565         if (!netdev->dcbnl_ops->getpgtccfgtx ||
 566             !netdev->dcbnl_ops->getpgtccfgrx ||
 567             !netdev->dcbnl_ops->getpgbwgcfgtx ||
 568             !netdev->dcbnl_ops->getpgbwgcfgrx)
 569                 return -EOPNOTSUPP;
 570
 571         ret = nla_parse_nested_deprecated(pg_tb, DCB_PG_ATTR_MAX,
 572                                           tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest,
 573                                           NULL);
 574         if (ret)
 575                 return ret;
 576
 577         pg_nest = nla_nest_start_noflag(skb, DCB_ATTR_PG_CFG);
 578         if (!pg_nest)
 579                 return -EMSGSIZE;
 580
 581         if (pg_tb[DCB_PG_ATTR_TC_ALL])
 582                 getall = 1;
 583
 584         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 585                 if (!getall && !pg_tb[i])
 586                         continue;
 587
 588                 if (pg_tb[DCB_PG_ATTR_TC_ALL])
 589                         data = pg_tb[DCB_PG_ATTR_TC_ALL];
 590                 else
 591                         data = pg_tb[i];
 592                 ret = nla_parse_nested_deprecated(param_tb,
 593                                                   DCB_TC_ATTR_PARAM_MAX, data,
 594                                                   dcbnl_tc_param_nest, NULL);
 595                 if (ret)
 596                         goto err_pg;
 597
 598                 param_nest = nla_nest_start_noflag(skb, i);
 599                 if (!param_nest)
 600                         goto err_pg;
 601
 602                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 603                 prio = DCB_ATTR_VALUE_UNDEFINED;
 604                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 605                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 606
 607                 if (dir) {
 608                         /* Rx */
 609                         netdev->dcbnl_ops->getpgtccfgrx(netdev,
 610                                                 i - DCB_PG_ATTR_TC_0, &prio,
 611                                                 &pgid, &tc_pct, &up_map);
 612                 } else {
 613                         /* Tx */
 614                         netdev->dcbnl_ops->getpgtccfgtx(netdev,
 615                                                 i - DCB_PG_ATTR_TC_0, &prio,
 616                                                 &pgid, &tc_pct, &up_map);
 617                 }
 618
 619                 if (param_tb[DCB_TC_ATTR_PARAM_PGID] ||
 620                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 621                         ret = nla_put_u8(skb,
 622                                          DCB_TC_ATTR_PARAM_PGID, pgid);
 623                         if (ret)
 624                                 goto err_param;
 625                 }
 626                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING] ||
 627                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 628                         ret = nla_put_u8(skb,
 629                                          DCB_TC_ATTR_PARAM_UP_MAPPING, up_map);
 630                         if (ret)
 631                                 goto err_param;
 632                 }
 633                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO] ||
 634                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 635                         ret = nla_put_u8(skb,
 636                                          DCB_TC_ATTR_PARAM_STRICT_PRIO, prio);
 637                         if (ret)
 638                                 goto err_param;
 639                 }
 640                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT] ||
 641                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 642                         ret = nla_put_u8(skb, DCB_TC_ATTR_PARAM_BW_PCT,
 643                                          tc_pct);
 644                         if (ret)
 645                                 goto err_param;
 646                 }
 647                 nla_nest_end(skb, param_nest);
 648         }
 649
 650         if (pg_tb[DCB_PG_ATTR_BW_ID_ALL])
 651                 getall = 1;
 652         else
 653                 getall = 0;
 654
 655         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 656                 if (!getall && !pg_tb[i])
 657                         continue;
 658
 659                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 660
 661                 if (dir) {
 662                         /* Rx */
 663                         netdev->dcbnl_ops->getpgbwgcfgrx(netdev,
 664                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 665                 } else {
 666                         /* Tx */
 667                         netdev->dcbnl_ops->getpgbwgcfgtx(netdev,
 668                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 669                 }
 670                 ret = nla_put_u8(skb, i, tc_pct);
 671                 if (ret)
 672                         goto err_pg;
 673         }
 674
 675         nla_nest_end(skb, pg_nest);
 676
 677         return 0;
 678
 679 err_param:
 680         nla_nest_cancel(skb, param_nest);
 681 err_pg:
 682         nla_nest_cancel(skb, pg_nest);
 683
 684         return -EMSGSIZE;
 685 }
 686
 687 static int dcbnl_pgtx_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 688                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 689 {
 690         return __dcbnl_pg_getcfg(netdev, nlh, tb, skb, 0);
 691 }
 692
 693 static int dcbnl_pgrx_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 694                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 695 {
 696         return __dcbnl_pg_getcfg(netdev, nlh, tb, skb, 1);
 697 }
 698
 699 static int dcbnl_setstate(struct net_device *netdev, struct nlmsghdr *nlh,
 700                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
 701 {
 702         u8 value;
 703
 704         if (!tb[DCB_ATTR_STATE])
 705                 return -EINVAL;
 706
 707         if (!netdev->dcbnl_ops->setstate)
 708                 return -EOPNOTSUPP;
 709
 710         value = nla_get_u8(tb[DCB_ATTR_STATE]);
 711
 712         return nla_put_u8(skb, DCB_ATTR_STATE,
 713                           netdev->dcbnl_ops->setstate(netdev, value));
 714 }
 715
 716 static int dcbnl_setpfccfg(struct net_device *netdev, struct nlmsghdr *nlh,
 717                            u32 seq, struct nlattr **tb, struct sk_buff *skb)
 718 {
 719         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1];
 720         int i;
 721         int ret;
 722         u8 value;
 723
 724         if (!tb[DCB_ATTR_PFC_CFG])
 725                 return -EINVAL;
 726
 727         if (!netdev->dcbnl_ops->setpfccfg)
 728                 return -EOPNOTSUPP;
 729
 730         ret = nla_parse_nested_deprecated(data, DCB_PFC_UP_ATTR_MAX,
 731                                           tb[DCB_ATTR_PFC_CFG],
 732                                           dcbnl_pfc_up_nest, NULL);
 733         if (ret)
 734                 return ret;
 735
 736         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 737                 if (data[i] == NULL)
 738                         continue;
 739                 value = nla_get_u8(data[i]);
 740                 netdev->dcbnl_ops->setpfccfg(netdev,
 741                         data[i]->nla_type - DCB_PFC_UP_ATTR_0, value);
 742         }
 743
 744         return nla_put_u8(skb, DCB_ATTR_PFC_CFG, 0);
 745 }
 746
 747 static int dcbnl_setall(struct net_device *netdev, struct nlmsghdr *nlh,
 748                         u32 seq, struct nlattr **tb, struct sk_buff *skb)
 749 {
 750         int ret;
 751
 752         if (!tb[DCB_ATTR_SET_ALL])
 753                 return -EINVAL;
 754
 755         if (!netdev->dcbnl_ops->setall)
 756                 return -EOPNOTSUPP;
 757
 758         ret = nla_put_u8(skb, DCB_ATTR_SET_ALL,
 759                          netdev->dcbnl_ops->setall(netdev));
 760         dcbnl_cee_notify(netdev, RTM_SETDCB, DCB_CMD_SET_ALL, seq, 0);
 761
 762         return ret;
 763 }
 764
 765 static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 766                              u32 seq, struct nlattr **tb, struct sk_buff *skb,
 767                              int dir)
 768 {
 769         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 770         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 771         int ret;
 772         int i;
 773         u8 pgid;
 774         u8 up_map;
 775         u8 prio;
 776         u8 tc_pct;
 777
 778         if (!tb[DCB_ATTR_PG_CFG])
 779                 return -EINVAL;
 780
 781         if (!netdev->dcbnl_ops->setpgtccfgtx ||
 782             !netdev->dcbnl_ops->setpgtccfgrx ||
 783             !netdev->dcbnl_ops->setpgbwgcfgtx ||
 784             !netdev->dcbnl_ops->setpgbwgcfgrx)
 785                 return -EOPNOTSUPP;
 786
 787         ret = nla_parse_nested_deprecated(pg_tb, DCB_PG_ATTR_MAX,
 788                                           tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest,
 789                                           NULL);
 790         if (ret)
 791                 return ret;
 792
 793         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 794                 if (!pg_tb[i])
 795                         continue;
 796
 797                 ret = nla_parse_nested_deprecated(param_tb,
 798                                                   DCB_TC_ATTR_PARAM_MAX,
 799                                                   pg_tb[i],
 800                                                   dcbnl_tc_param_nest, NULL);
 801                 if (ret)
 802                         return ret;
 803
 804                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 805                 prio = DCB_ATTR_VALUE_UNDEFINED;
 806                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 807                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 808
 809                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO])
 810                         prio =
 811                             nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO]);
 812
 813                 if (param_tb[DCB_TC_ATTR_PARAM_PGID])
 814                         pgid = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_PGID]);
 815
 816                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT])
 817                         tc_pct = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_BW_PCT]);
 818
 819                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING])
 820                         up_map =
 821                              nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING]);
 822
 823                 /* dir: Tx = 0, Rx = 1 */
 824                 if (dir) {
 825                         /* Rx */
 826                         netdev->dcbnl_ops->setpgtccfgrx(netdev,
 827                                 i - DCB_PG_ATTR_TC_0,
 828                                 prio, pgid, tc_pct, up_map);
 829                 } else {
 830                         /* Tx */
 831                         netdev->dcbnl_ops->setpgtccfgtx(netdev,
 832                                 i - DCB_PG_ATTR_TC_0,
 833                                 prio, pgid, tc_pct, up_map);
 834                 }
 835         }
 836
 837         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 838                 if (!pg_tb[i])
 839                         continue;
 840
 841                 tc_pct = nla_get_u8(pg_tb[i]);
 842
 843                 /* dir: Tx = 0, Rx = 1 */
 844                 if (dir) {
 845                         /* Rx */
 846                         netdev->dcbnl_ops->setpgbwgcfgrx(netdev,
 847                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
 848                 } else {
 849                         /* Tx */
 850                         netdev->dcbnl_ops->setpgbwgcfgtx(netdev,
 851                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
 852                 }
 853         }
 854
 855         return nla_put_u8(skb, DCB_ATTR_PG_CFG, 0);
 856 }
 857
 858 static int dcbnl_pgtx_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 859                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 860 {
 861         return __dcbnl_pg_setcfg(netdev, nlh, seq, tb, skb, 0);
 862 }
 863
 864 static int dcbnl_pgrx_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 865                              u32 seq, struct nlattr **tb, struct sk_buff *skb)
 866 {
 867         return __dcbnl_pg_setcfg(netdev, nlh, seq, tb, skb, 1);
 868 }
 869
 870 static int dcbnl_bcn_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 871                             u32 seq, struct nlattr **tb, struct sk_buff *skb)
 872 {
 873         struct nlattr *bcn_nest;
 874         struct nlattr *bcn_tb[DCB_BCN_ATTR_MAX + 1];
 875         u8 value_byte;
 876         u32 value_integer;
 877         int ret;
 878         bool getall = false;
 879         int i;
 880
 881         if (!tb[DCB_ATTR_BCN])
 882                 return -EINVAL;
 883
 884         if (!netdev->dcbnl_ops->getbcnrp ||
 885             !netdev->dcbnl_ops->getbcncfg)
 886                 return -EOPNOTSUPP;
 887
 888         ret = nla_parse_nested_deprecated(bcn_tb, DCB_BCN_ATTR_MAX,
 889                                           tb[DCB_ATTR_BCN], dcbnl_bcn_nest,
 890                                           NULL);
 891         if (ret)
 892                 return ret;
 893
 894         bcn_nest = nla_nest_start_noflag(skb, DCB_ATTR_BCN);
 895         if (!bcn_nest)
 896                 return -EMSGSIZE;
 897
 898         if (bcn_tb[DCB_BCN_ATTR_ALL])
 899                 getall = true;
 900
 901         for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
 902                 if (!getall && !bcn_tb[i])
 903                         continue;
 904
 905                 netdev->dcbnl_ops->getbcnrp(netdev, i - DCB_BCN_ATTR_RP_0,
 906                                             &value_byte);
 907                 ret = nla_put_u8(skb, i, value_byte);
 908                 if (ret)
 909                         goto err_bcn;
 910         }
 911
 912         for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {
 913                 if (!getall && !bcn_tb[i])
 914                         continue;
 915
 916                 netdev->dcbnl_ops->getbcncfg(netdev, i,
 917                                              &value_integer);
 918                 ret = nla_put_u32(skb, i, value_integer);
 919                 if (ret)
 920                         goto err_bcn;
 921         }
 922
 923         nla_nest_end(skb, bcn_nest);
 924
 925         return 0;
 926
 927 err_bcn:
 928         nla_nest_cancel(skb, bcn_nest);
 929         return ret;
 930 }
 931
 932 static int dcbnl_bcn_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
 933                             u32 seq, struct nlattr **tb, struct sk_buff *skb)
 934 {
 935         struct nlattr *data[DCB_BCN_ATTR_MAX + 1];
 936         int i;
 937         int ret;
 938         u8 value_byte;
 939         u32 value_int;
 940
 941         if (!tb[DCB_ATTR_BCN])
 942                 return -EINVAL;
 943
 944         if (!netdev->dcbnl_ops->setbcncfg ||
 945             !netdev->dcbnl_ops->setbcnrp)
 946                 return -EOPNOTSUPP;
 947
 948         ret = nla_parse_nested_deprecated(data, DCB_BCN_ATTR_MAX,
 949                                           tb[DCB_ATTR_BCN], dcbnl_pfc_up_nest,
 950                                           NULL);
 951         if (ret)
 952                 return ret;
 953
 954         for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
 955                 if (data[i] == NULL)
 956                         continue;
 957                 value_byte = nla_get_u8(data[i]);
 958                 netdev->dcbnl_ops->setbcnrp(netdev,
 959                         data[i]->nla_type - DCB_BCN_ATTR_RP_0, value_byte);
 960         }
 961
 962         for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {
 963                 if (data[i] == NULL)
 964                         continue;
 965                 value_int = nla_get_u32(data[i]);
 966                 netdev->dcbnl_ops->setbcncfg(netdev,
 967                                              i, value_int);
 968         }
 969
 970         return nla_put_u8(skb, DCB_ATTR_BCN, 0);
 971 }
 972
 973 static int dcbnl_build_peer_app(struct net_device *netdev, struct sk_buff* skb,
 974                                 int app_nested_type, int app_info_type,
 975                                 int app_entry_type)
 976 {
 977         struct dcb_peer_app_info info;
 978         struct dcb_app *table = NULL;
 979         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
 980         u16 app_count;
 981         int err;
 982
 983
 984         /**
 985          * retrieve the peer app configuration form the driver. If the driver
 986          * handlers fail exit without doing anything
 987          */
 988         err = ops->peer_getappinfo(netdev, &info, &app_count);
 989         if (!err && app_count) {
 990                 table = kmalloc_array(app_count, sizeof(struct dcb_app),
 991                                       GFP_KERNEL);
 992                 if (!table)
 993                         return -ENOMEM;
 994
 995                 err = ops->peer_getapptable(netdev, table);
 996         }
 997
 998         if (!err) {
 999                 u16 i;
1000                 struct nlattr *app;
1001
1002                 /**
1003                  * build the message, from here on the only possible failure
1004                  * is due to the skb size
1005                  */
1006                 err = -EMSGSIZE;
1007
1008                 app = nla_nest_start_noflag(skb, app_nested_type);
1009                 if (!app)
1010                         goto nla_put_failure;
1011
1012                 if (app_info_type &&
1013                     nla_put(skb, app_info_type, sizeof(info), &info))
1014                         goto nla_put_failure;
1015
1016                 for (i = 0; i < app_count; i++) {
1017                         if (nla_put(skb, app_entry_type, sizeof(struct dcb_app),
1018                                     &table[i]))
1019                                 goto nla_put_failure;
1020                 }
1021                 nla_nest_end(skb, app);
1022         }
1023         err = 0;
1024
1025 nla_put_failure:
1026         kfree(table);
1027         return err;
1028 }
1029
1030 /* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb GET commands. */
1031 static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
1032 {
1033         struct nlattr *ieee, *app;
1034         struct dcb_app_type *itr;
1035         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1036         int dcbx;
1037         int err;
1038
1039         if (nla_put_string(skb, DCB_ATTR_IFNAME, netdev->name))
1040                 return -EMSGSIZE;
1041
1042         ieee = nla_nest_start_noflag(skb, DCB_ATTR_IEEE);
1043         if (!ieee)
1044                 return -EMSGSIZE;
1045
1046         if (ops->ieee_getets) {
1047                 struct ieee_ets ets;
1048                 memset(&ets, 0, sizeof(ets));
1049                 err = ops->ieee_getets(netdev, &ets);
1050                 if (!err &&
1051                     nla_put(skb, DCB_ATTR_IEEE_ETS, sizeof(ets), &ets))
1052                         return -EMSGSIZE;
1053         }
1054
1055         if (ops->ieee_getmaxrate) {
1056                 struct ieee_maxrate maxrate;
1057                 memset(&maxrate, 0, sizeof(maxrate));
1058                 err = ops->ieee_getmaxrate(netdev, &maxrate);
1059                 if (!err) {
1060                         err = nla_put(skb, DCB_ATTR_IEEE_MAXRATE,
1061                                       sizeof(maxrate), &maxrate);
1062                         if (err)
1063                                 return -EMSGSIZE;
1064                 }
1065         }
1066
1067         if (ops->ieee_getqcn) {
1068                 struct ieee_qcn qcn;
1069
1070                 memset(&qcn, 0, sizeof(qcn));
1071                 err = ops->ieee_getqcn(netdev, &qcn);
1072                 if (!err) {
1073                         err = nla_put(skb, DCB_ATTR_IEEE_QCN,
1074                                       sizeof(qcn), &qcn);
1075                         if (err)
1076                                 return -EMSGSIZE;
1077                 }
1078         }
1079
1080         if (ops->ieee_getqcnstats) {
1081                 struct ieee_qcn_stats qcn_stats;
1082
1083                 memset(&qcn_stats, 0, sizeof(qcn_stats));
1084                 err = ops->ieee_getqcnstats(netdev, &qcn_stats);
1085                 if (!err) {
1086                         err = nla_put(skb, DCB_ATTR_IEEE_QCN_STATS,
1087                                       sizeof(qcn_stats), &qcn_stats);
1088                         if (err)
1089                                 return -EMSGSIZE;
1090                 }
1091         }
1092
1093         if (ops->ieee_getpfc) {
1094                 struct ieee_pfc pfc;
1095                 memset(&pfc, 0, sizeof(pfc));
1096                 err = ops->ieee_getpfc(netdev, &pfc);
1097                 if (!err &&
1098                     nla_put(skb, DCB_ATTR_IEEE_PFC, sizeof(pfc), &pfc))
1099                         return -EMSGSIZE;
1100         }
1101
1102         if (ops->dcbnl_getbuffer) {
1103                 struct dcbnl_buffer buffer;
1104
1105                 memset(&buffer, 0, sizeof(buffer));
1106                 err = ops->dcbnl_getbuffer(netdev, &buffer);
1107                 if (!err &&
1108                     nla_put(skb, DCB_ATTR_DCB_BUFFER, sizeof(buffer), &buffer))
1109                         return -EMSGSIZE;
1110         }
1111
1112         app = nla_nest_start_noflag(skb, DCB_ATTR_IEEE_APP_TABLE);
1113         if (!app)
1114                 return -EMSGSIZE;
1115
1116         spin_lock_bh(&dcb_lock);
1117         list_for_each_entry(itr, &dcb_app_list, list) {
1118                 if (itr->ifindex == netdev->ifindex) {
1119                         err = nla_put(skb, DCB_ATTR_IEEE_APP, sizeof(itr->app),
1120                                          &itr->app);
1121                         if (err) {
1122                                 spin_unlock_bh(&dcb_lock);
1123                                 return -EMSGSIZE;
1124                         }
1125                 }
1126         }
1127
1128         if (netdev->dcbnl_ops->getdcbx)
1129                 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
1130         else
1131                 dcbx = -EOPNOTSUPP;
1132
1133         spin_unlock_bh(&dcb_lock);
1134         nla_nest_end(skb, app);
1135
1136         /* get peer info if available */
1137         if (ops->ieee_peer_getets) {
1138                 struct ieee_ets ets;
1139                 memset(&ets, 0, sizeof(ets));
1140                 err = ops->ieee_peer_getets(netdev, &ets);
1141                 if (!err &&
1142                     nla_put(skb, DCB_ATTR_IEEE_PEER_ETS, sizeof(ets), &ets))
1143                         return -EMSGSIZE;
1144         }
1145
1146         if (ops->ieee_peer_getpfc) {
1147                 struct ieee_pfc pfc;
1148                 memset(&pfc, 0, sizeof(pfc));
1149                 err = ops->ieee_peer_getpfc(netdev, &pfc);
1150                 if (!err &&
1151                     nla_put(skb, DCB_ATTR_IEEE_PEER_PFC, sizeof(pfc), &pfc))
1152                         return -EMSGSIZE;
1153         }
1154
1155         if (ops->peer_getappinfo && ops->peer_getapptable) {
1156                 err = dcbnl_build_peer_app(netdev, skb,
1157                                            DCB_ATTR_IEEE_PEER_APP,
1158                                            DCB_ATTR_IEEE_APP_UNSPEC,
1159                                            DCB_ATTR_IEEE_APP);
1160                 if (err)
1161                         return -EMSGSIZE;
1162         }
1163
1164         nla_nest_end(skb, ieee);
1165         if (dcbx >= 0) {
1166                 err = nla_put_u8(skb, DCB_ATTR_DCBX, dcbx);
1167                 if (err)
1168                         return -EMSGSIZE;
1169         }
1170
1171         return 0;
1172 }
1173
1174 static int dcbnl_cee_pg_fill(struct sk_buff *skb, struct net_device *dev,
1175                              int dir)
1176 {
1177         u8 pgid, up_map, prio, tc_pct;
1178         const struct dcbnl_rtnl_ops *ops = dev->dcbnl_ops;
1179         int i = dir ? DCB_ATTR_CEE_TX_PG : DCB_ATTR_CEE_RX_PG;
1180         struct nlattr *pg = nla_nest_start_noflag(skb, i);
1181
1182         if (!pg)
1183                 return -EMSGSIZE;
1184
1185         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
1186                 struct nlattr *tc_nest = nla_nest_start_noflag(skb, i);
1187
1188                 if (!tc_nest)
1189                         return -EMSGSIZE;
1190
1191                 pgid = DCB_ATTR_VALUE_UNDEFINED;
1192                 prio = DCB_ATTR_VALUE_UNDEFINED;
1193                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
1194                 up_map = DCB_ATTR_VALUE_UNDEFINED;
1195
1196                 if (!dir)
1197                         ops->getpgtccfgrx(dev, i - DCB_PG_ATTR_TC_0,
1198                                           &prio, &pgid, &tc_pct, &up_map);
1199                 else
1200                         ops->getpgtccfgtx(dev, i - DCB_PG_ATTR_TC_0,
1201                                           &prio, &pgid, &tc_pct, &up_map);
1202
1203                 if (nla_put_u8(skb, DCB_TC_ATTR_PARAM_PGID, pgid) ||
1204                     nla_put_u8(skb, DCB_TC_ATTR_PARAM_UP_MAPPING, up_map) ||
1205                     nla_put_u8(skb, DCB_TC_ATTR_PARAM_STRICT_PRIO, prio) ||
1206                     nla_put_u8(skb, DCB_TC_ATTR_PARAM_BW_PCT, tc_pct))
1207                         return -EMSGSIZE;
1208                 nla_nest_end(skb, tc_nest);
1209         }
1210
1211         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
1212                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
1213
1214                 if (!dir)
1215                         ops->getpgbwgcfgrx(dev, i - DCB_PG_ATTR_BW_ID_0,
1216                                            &tc_pct);
1217                 else
1218                         ops->getpgbwgcfgtx(dev, i - DCB_PG_ATTR_BW_ID_0,
1219                                            &tc_pct);
1220                 if (nla_put_u8(skb, i, tc_pct))
1221                         return -EMSGSIZE;
1222         }
1223         nla_nest_end(skb, pg);
1224         return 0;
1225 }
1226
1227 static int dcbnl_cee_fill(struct sk_buff *skb, struct net_device *netdev)
1228 {
1229         struct nlattr *cee, *app;
1230         struct dcb_app_type *itr;
1231         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1232         int dcbx, i, err = -EMSGSIZE;
1233         u8 value;
1234
1235         if (nla_put_string(skb, DCB_ATTR_IFNAME, netdev->name))
1236                 goto nla_put_failure;
1237         cee = nla_nest_start_noflag(skb, DCB_ATTR_CEE);
1238         if (!cee)
1239                 goto nla_put_failure;
1240
1241         /* local pg */
1242         if (ops->getpgtccfgtx && ops->getpgbwgcfgtx) {
1243                 err = dcbnl_cee_pg_fill(skb, netdev, 1);
1244                 if (err)
1245                         goto nla_put_failure;
1246         }
1247
1248         if (ops->getpgtccfgrx && ops->getpgbwgcfgrx) {
1249                 err = dcbnl_cee_pg_fill(skb, netdev, 0);
1250                 if (err)
1251                         goto nla_put_failure;
1252         }
1253
1254         /* local pfc */
1255         if (ops->getpfccfg) {
1256                 struct nlattr *pfc_nest = nla_nest_start_noflag(skb,
1257                                                                 DCB_ATTR_CEE_PFC);
1258
1259                 if (!pfc_nest)
1260                         goto nla_put_failure;
1261
1262                 for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
1263                         ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0, &value);
1264                         if (nla_put_u8(skb, i, value))
1265                                 goto nla_put_failure;
1266                 }
1267                 nla_nest_end(skb, pfc_nest);
1268         }
1269
1270         /* local app */
1271         spin_lock_bh(&dcb_lock);
1272         app = nla_nest_start_noflag(skb, DCB_ATTR_CEE_APP_TABLE);
1273         if (!app)
1274                 goto dcb_unlock;
1275
1276         list_for_each_entry(itr, &dcb_app_list, list) {
1277                 if (itr->ifindex == netdev->ifindex) {
1278                         struct nlattr *app_nest = nla_nest_start_noflag(skb,
1279                                                                         DCB_ATTR_APP);
1280                         if (!app_nest)
1281                                 goto dcb_unlock;
1282
1283                         err = nla_put_u8(skb, DCB_APP_ATTR_IDTYPE,
1284                                          itr->app.selector);
1285                         if (err)
1286                                 goto dcb_unlock;
1287
1288                         err = nla_put_u16(skb, DCB_APP_ATTR_ID,
1289                                           itr->app.protocol);
1290                         if (err)
1291                                 goto dcb_unlock;
1292
1293                         err = nla_put_u8(skb, DCB_APP_ATTR_PRIORITY,
1294                                          itr->app.priority);
1295                         if (err)
1296                                 goto dcb_unlock;
1297
1298                         nla_nest_end(skb, app_nest);
1299                 }
1300         }
1301         nla_nest_end(skb, app);
1302
1303         if (netdev->dcbnl_ops->getdcbx)
1304                 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
1305         else
1306                 dcbx = -EOPNOTSUPP;
1307
1308         spin_unlock_bh(&dcb_lock);
1309
1310         /* features flags */
1311         if (ops->getfeatcfg) {
1312                 struct nlattr *feat = nla_nest_start_noflag(skb,
1313                                                             DCB_ATTR_CEE_FEAT);
1314                 if (!feat)
1315                         goto nla_put_failure;
1316
1317                 for (i = DCB_FEATCFG_ATTR_ALL + 1; i <= DCB_FEATCFG_ATTR_MAX;
1318                      i++)
1319                         if (!ops->getfeatcfg(netdev, i, &value) &&
1320                             nla_put_u8(skb, i, value))
1321                                 goto nla_put_failure;
1322
1323                 nla_nest_end(skb, feat);
1324         }
1325
1326         /* peer info if available */
1327         if (ops->cee_peer_getpg) {
1328                 struct cee_pg pg;
1329                 memset(&pg, 0, sizeof(pg));
1330                 err = ops->cee_peer_getpg(netdev, &pg);
1331                 if (!err &&
1332                     nla_put(skb, DCB_ATTR_CEE_PEER_PG, sizeof(pg), &pg))
1333                         goto nla_put_failure;
1334         }
1335
1336         if (ops->cee_peer_getpfc) {
1337                 struct cee_pfc pfc;
1338                 memset(&pfc, 0, sizeof(pfc));
1339                 err = ops->cee_peer_getpfc(netdev, &pfc);
1340                 if (!err &&
1341                     nla_put(skb, DCB_ATTR_CEE_PEER_PFC, sizeof(pfc), &pfc))
1342                         goto nla_put_failure;
1343         }
1344
1345         if (ops->peer_getappinfo && ops->peer_getapptable) {
1346                 err = dcbnl_build_peer_app(netdev, skb,
1347                                            DCB_ATTR_CEE_PEER_APP_TABLE,
1348                                            DCB_ATTR_CEE_PEER_APP_INFO,
1349                                            DCB_ATTR_CEE_PEER_APP);
1350                 if (err)
1351                         goto nla_put_failure;
1352         }
1353         nla_nest_end(skb, cee);
1354
1355         /* DCBX state */
1356         if (dcbx >= 0) {
1357                 err = nla_put_u8(skb, DCB_ATTR_DCBX, dcbx);
1358                 if (err)
1359                         goto nla_put_failure;
1360         }
1361         return 0;
1362
1363 dcb_unlock:
1364         spin_unlock_bh(&dcb_lock);
1365 nla_put_failure:
1366         err = -EMSGSIZE;
1367         return err;
1368 }
1369
1370 static int dcbnl_notify(struct net_device *dev, int event, int cmd,
1371                         u32 seq, u32 portid, int dcbx_ver)
1372 {
1373         struct net *net = dev_net(dev);
1374         struct sk_buff *skb;
1375         struct nlmsghdr *nlh;
1376         const struct dcbnl_rtnl_ops *ops = dev->dcbnl_ops;
1377         int err;
1378
1379         if (!ops)
1380                 return -EOPNOTSUPP;
1381
1382         skb = dcbnl_newmsg(event, cmd, portid, seq, 0, &nlh);
1383         if (!skb)
1384                 return -ENOMEM;
1385
1386         if (dcbx_ver == DCB_CAP_DCBX_VER_IEEE)
1387                 err = dcbnl_ieee_fill(skb, dev);
1388         else
1389                 err = dcbnl_cee_fill(skb, dev);
1390
1391         if (err < 0) {
1392                 /* Report error to broadcast listeners */
1393                 nlmsg_free(skb);
1394                 rtnl_set_sk_err(net, RTNLGRP_DCB, err);
1395         } else {
1396                 /* End nlmsg and notify broadcast listeners */
1397                 nlmsg_end(skb, nlh);
1398                 rtnl_notify(skb, net, 0, RTNLGRP_DCB, NULL, GFP_KERNEL);
1399         }
1400
1401         return err;
1402 }
1403
1404 int dcbnl_ieee_notify(struct net_device *dev, int event, int cmd,
1405                       u32 seq, u32 portid)
1406 {
1407         return dcbnl_notify(dev, event, cmd, seq, portid, DCB_CAP_DCBX_VER_IEEE);
1408 }
1409 EXPORT_SYMBOL(dcbnl_ieee_notify);
1410
1411 int dcbnl_cee_notify(struct net_device *dev, int event, int cmd,
1412                      u32 seq, u32 portid)
1413 {
1414         return dcbnl_notify(dev, event, cmd, seq, portid, DCB_CAP_DCBX_VER_CEE);
1415 }
1416 EXPORT_SYMBOL(dcbnl_cee_notify);
1417
1418 /* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb SET commands.
1419  * If any requested operation can not be completed
1420  * the entire msg is aborted and error value is returned.
1421  * No attempt is made to reconcile the case where only part of the
1422  * cmd can be completed.
1423  */
1424 static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh,
1425                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
1426 {
1427         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1428         struct nlattr *ieee[DCB_ATTR_IEEE_MAX + 1];
1429         int prio;
1430         int err;
1431
1432         if (!ops)
1433                 return -EOPNOTSUPP;
1434
1435         if (!tb[DCB_ATTR_IEEE])
1436                 return -EINVAL;
1437
1438         err = nla_parse_nested_deprecated(ieee, DCB_ATTR_IEEE_MAX,
1439                                           tb[DCB_ATTR_IEEE],
1440                                           dcbnl_ieee_policy, NULL);
1441         if (err)
1442                 return err;
1443
1444         if (ieee[DCB_ATTR_IEEE_ETS] && ops->ieee_setets) {
1445                 struct ieee_ets *ets = nla_data(ieee[DCB_ATTR_IEEE_ETS]);
1446                 err = ops->ieee_setets(netdev, ets);
1447                 if (err)
1448                         goto err;
1449         }
1450
1451         if (ieee[DCB_ATTR_IEEE_MAXRATE] && ops->ieee_setmaxrate) {
1452                 struct ieee_maxrate *maxrate =
1453                         nla_data(ieee[DCB_ATTR_IEEE_MAXRATE]);
1454                 err = ops->ieee_setmaxrate(netdev, maxrate);
1455                 if (err)
1456                         goto err;
1457         }
1458
1459         if (ieee[DCB_ATTR_IEEE_QCN] && ops->ieee_setqcn) {
1460                 struct ieee_qcn *qcn =
1461                         nla_data(ieee[DCB_ATTR_IEEE_QCN]);
1462
1463                 err = ops->ieee_setqcn(netdev, qcn);
1464                 if (err)
1465                         goto err;
1466         }
1467
1468         if (ieee[DCB_ATTR_IEEE_PFC] && ops->ieee_setpfc) {
1469                 struct ieee_pfc *pfc = nla_data(ieee[DCB_ATTR_IEEE_PFC]);
1470                 err = ops->ieee_setpfc(netdev, pfc);
1471                 if (err)
1472                         goto err;
1473         }
1474
1475         if (ieee[DCB_ATTR_DCB_BUFFER] && ops->dcbnl_setbuffer) {
1476                 struct dcbnl_buffer *buffer =
1477                         nla_data(ieee[DCB_ATTR_DCB_BUFFER]);
1478
1479                 for (prio = 0; prio < ARRAY_SIZE(buffer->prio2buffer); prio++) {
1480                         if (buffer->prio2buffer[prio] >= DCBX_MAX_BUFFERS) {
1481                                 err = -EINVAL;
1482                                 goto err;
1483                         }
1484                 }
1485
1486                 err = ops->dcbnl_setbuffer(netdev, buffer);
1487                 if (err)
1488                         goto err;
1489         }
1490
1491         if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
1492                 struct nlattr *attr;
1493                 int rem;
1494
1495                 nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
1496                         struct dcb_app *app_data;
1497
1498                         if (nla_type(attr) != DCB_ATTR_IEEE_APP)
1499                                 continue;
1500
1501                         if (nla_len(attr) < sizeof(struct dcb_app)) {
1502                                 err = -ERANGE;
1503                                 goto err;
1504                         }
1505
1506                         app_data = nla_data(attr);
1507                         if (ops->ieee_setapp)
1508                                 err = ops->ieee_setapp(netdev, app_data);
1509                         else
1510                                 err = dcb_ieee_setapp(netdev, app_data);
1511                         if (err)
1512                                 goto err;
1513                 }
1514         }
1515
1516 err:
1517         err = nla_put_u8(skb, DCB_ATTR_IEEE, err);
1518         dcbnl_ieee_notify(netdev, RTM_SETDCB, DCB_CMD_IEEE_SET, seq, 0);
1519         return err;
1520 }
1521
1522 static int dcbnl_ieee_get(struct net_device *netdev, struct nlmsghdr *nlh,
1523                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
1524 {
1525         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1526
1527         if (!ops)
1528                 return -EOPNOTSUPP;
1529
1530         return dcbnl_ieee_fill(skb, netdev);
1531 }
1532
1533 static int dcbnl_ieee_del(struct net_device *netdev, struct nlmsghdr *nlh,
1534                           u32 seq, struct nlattr **tb, struct sk_buff *skb)
1535 {
1536         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1537         struct nlattr *ieee[DCB_ATTR_IEEE_MAX + 1];
1538         int err;
1539
1540         if (!ops)
1541                 return -EOPNOTSUPP;
1542
1543         if (!tb[DCB_ATTR_IEEE])
1544                 return -EINVAL;
1545
1546         err = nla_parse_nested_deprecated(ieee, DCB_ATTR_IEEE_MAX,
1547                                           tb[DCB_ATTR_IEEE],
1548                                           dcbnl_ieee_policy, NULL);
1549         if (err)
1550                 return err;
1551
1552         if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
1553                 struct nlattr *attr;
1554                 int rem;
1555
1556                 nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
1557                         struct dcb_app *app_data;
1558
1559                         if (nla_type(attr) != DCB_ATTR_IEEE_APP)
1560                                 continue;
1561                         app_data = nla_data(attr);
1562                         if (ops->ieee_delapp)
1563                                 err = ops->ieee_delapp(netdev, app_data);
1564                         else
1565                                 err = dcb_ieee_delapp(netdev, app_data);
1566                         if (err)
1567                                 goto err;
1568                 }
1569         }
1570
1571 err:
1572         err = nla_put_u8(skb, DCB_ATTR_IEEE, err);
1573         dcbnl_ieee_notify(netdev, RTM_SETDCB, DCB_CMD_IEEE_DEL, seq, 0);
1574         return err;
1575 }
1576
1577
1578 /* DCBX configuration */
1579 static int dcbnl_getdcbx(struct net_device *netdev, struct nlmsghdr *nlh,
1580                          u32 seq, struct nlattr **tb, struct sk_buff *skb)
1581 {
1582         if (!netdev->dcbnl_ops->getdcbx)
1583                 return -EOPNOTSUPP;
1584
1585         return nla_put_u8(skb, DCB_ATTR_DCBX,
1586                           netdev->dcbnl_ops->getdcbx(netdev));
1587 }
1588
1589 static int dcbnl_setdcbx(struct net_device *netdev, struct nlmsghdr *nlh,
1590                          u32 seq, struct nlattr **tb, struct sk_buff *skb)
1591 {
1592         u8 value;
1593
1594         if (!netdev->dcbnl_ops->setdcbx)
1595                 return -EOPNOTSUPP;
1596
1597         if (!tb[DCB_ATTR_DCBX])
1598                 return -EINVAL;
1599
1600         value = nla_get_u8(tb[DCB_ATTR_DCBX]);
1601
1602         return nla_put_u8(skb, DCB_ATTR_DCBX,
1603                           netdev->dcbnl_ops->setdcbx(netdev, value));
1604 }
1605
1606 static int dcbnl_getfeatcfg(struct net_device *netdev, struct nlmsghdr *nlh,
1607                             u32 seq, struct nlattr **tb, struct sk_buff *skb)
1608 {
1609         struct nlattr *data[DCB_FEATCFG_ATTR_MAX + 1], *nest;
1610         u8 value;
1611         int ret, i;
1612         int getall = 0;
1613
1614         if (!netdev->dcbnl_ops->getfeatcfg)
1615                 return -EOPNOTSUPP;
1616
1617         if (!tb[DCB_ATTR_FEATCFG])
1618                 return -EINVAL;
1619
1620         ret = nla_parse_nested_deprecated(data, DCB_FEATCFG_ATTR_MAX,
1621                                           tb[DCB_ATTR_FEATCFG],
1622                                           dcbnl_featcfg_nest, NULL);
1623         if (ret)
1624                 return ret;
1625
1626         nest = nla_nest_start_noflag(skb, DCB_ATTR_FEATCFG);
1627         if (!nest)
1628                 return -EMSGSIZE;
1629
1630         if (data[DCB_FEATCFG_ATTR_ALL])
1631                 getall = 1;
1632
1633         for (i = DCB_FEATCFG_ATTR_ALL+1; i <= DCB_FEATCFG_ATTR_MAX; i++) {
1634                 if (!getall && !data[i])
1635                         continue;
1636
1637                 ret = netdev->dcbnl_ops->getfeatcfg(netdev, i, &value);
1638                 if (!ret)
1639                         ret = nla_put_u8(skb, i, value);
1640
1641                 if (ret) {
1642                         nla_nest_cancel(skb, nest);
1643                         goto nla_put_failure;
1644                 }
1645         }
1646         nla_nest_end(skb, nest);
1647
1648 nla_put_failure:
1649         return ret;
1650 }
1651
1652 static int dcbnl_setfeatcfg(struct net_device *netdev, struct nlmsghdr *nlh,
1653                             u32 seq, struct nlattr **tb, struct sk_buff *skb)
1654 {
1655         struct nlattr *data[DCB_FEATCFG_ATTR_MAX + 1];
1656         int ret, i;
1657         u8 value;
1658
1659         if (!netdev->dcbnl_ops->setfeatcfg)
1660                 return -ENOTSUPP;
1661
1662         if (!tb[DCB_ATTR_FEATCFG])
1663                 return -EINVAL;
1664
1665         ret = nla_parse_nested_deprecated(data, DCB_FEATCFG_ATTR_MAX,
1666                                           tb[DCB_ATTR_FEATCFG],
1667                                           dcbnl_featcfg_nest, NULL);
1668
1669         if (ret)
1670                 goto err;
1671
1672         for (i = DCB_FEATCFG_ATTR_ALL+1; i <= DCB_FEATCFG_ATTR_MAX; i++) {
1673                 if (data[i] == NULL)
1674                         continue;
1675
1676                 value = nla_get_u8(data[i]);
1677
1678                 ret = netdev->dcbnl_ops->setfeatcfg(netdev, i, value);
1679
1680                 if (ret)
1681                         goto err;
1682         }
1683 err:
1684         ret = nla_put_u8(skb, DCB_ATTR_FEATCFG, ret);
1685
1686         return ret;
1687 }
1688
1689 /* Handle CEE DCBX GET commands. */
1690 static int dcbnl_cee_get(struct net_device *netdev, struct nlmsghdr *nlh,
1691                          u32 seq, struct nlattr **tb, struct sk_buff *skb)
1692 {
1693         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1694
1695         if (!ops)
1696                 return -EOPNOTSUPP;
1697
1698         return dcbnl_cee_fill(skb, netdev);
1699 }
1700
1701 struct reply_func {
1702         /* reply netlink message type */
1703         int     type;
1704
1705         /* function to fill message contents */
1706         int   (*cb)(struct net_device *, struct nlmsghdr *, u32,
1707                     struct nlattr **, struct sk_buff *);
1708 };
1709
1710 static const struct reply_func reply_funcs[DCB_CMD_MAX+1] = {
1711         [DCB_CMD_GSTATE]        = { RTM_GETDCB, dcbnl_getstate },
1712         [DCB_CMD_SSTATE]        = { RTM_SETDCB, dcbnl_setstate },
1713         [DCB_CMD_PFC_GCFG]      = { RTM_GETDCB, dcbnl_getpfccfg },
1714         [DCB_CMD_PFC_SCFG]      = { RTM_SETDCB, dcbnl_setpfccfg },
1715         [DCB_CMD_GPERM_HWADDR]  = { RTM_GETDCB, dcbnl_getperm_hwaddr },
1716         [DCB_CMD_GCAP]          = { RTM_GETDCB, dcbnl_getcap },
1717         [DCB_CMD_GNUMTCS]       = { RTM_GETDCB, dcbnl_getnumtcs },
1718         [DCB_CMD_SNUMTCS]       = { RTM_SETDCB, dcbnl_setnumtcs },
1719         [DCB_CMD_PFC_GSTATE]    = { RTM_GETDCB, dcbnl_getpfcstate },
1720         [DCB_CMD_PFC_SSTATE]    = { RTM_SETDCB, dcbnl_setpfcstate },
1721         [DCB_CMD_GAPP]          = { RTM_GETDCB, dcbnl_getapp },
1722         [DCB_CMD_SAPP]          = { RTM_SETDCB, dcbnl_setapp },
1723         [DCB_CMD_PGTX_GCFG]     = { RTM_GETDCB, dcbnl_pgtx_getcfg },
1724         [DCB_CMD_PGTX_SCFG]     = { RTM_SETDCB, dcbnl_pgtx_setcfg },
1725         [DCB_CMD_PGRX_GCFG]     = { RTM_GETDCB, dcbnl_pgrx_getcfg },
1726         [DCB_CMD_PGRX_SCFG]     = { RTM_SETDCB, dcbnl_pgrx_setcfg },
1727         [DCB_CMD_SET_ALL]       = { RTM_SETDCB, dcbnl_setall },
1728         [DCB_CMD_BCN_GCFG]      = { RTM_GETDCB, dcbnl_bcn_getcfg },
1729         [DCB_CMD_BCN_SCFG]      = { RTM_SETDCB, dcbnl_bcn_setcfg },
1730         [DCB_CMD_IEEE_GET]      = { RTM_GETDCB, dcbnl_ieee_get },
1731         [DCB_CMD_IEEE_SET]      = { RTM_SETDCB, dcbnl_ieee_set },
1732         [DCB_CMD_IEEE_DEL]      = { RTM_SETDCB, dcbnl_ieee_del },
1733         [DCB_CMD_GDCBX]         = { RTM_GETDCB, dcbnl_getdcbx },
1734         [DCB_CMD_SDCBX]         = { RTM_SETDCB, dcbnl_setdcbx },
1735         [DCB_CMD_GFEATCFG]      = { RTM_GETDCB, dcbnl_getfeatcfg },
1736         [DCB_CMD_SFEATCFG]      = { RTM_SETDCB, dcbnl_setfeatcfg },
1737         [DCB_CMD_CEE_GET]       = { RTM_GETDCB, dcbnl_cee_get },
1738 };
1739
1740 static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
1741                     struct netlink_ext_ack *extack)
1742 {
1743         struct net *net = sock_net(skb->sk);
1744         struct net_device *netdev;
1745         struct dcbmsg *dcb = nlmsg_data(nlh);
1746         struct nlattr *tb[DCB_ATTR_MAX + 1];
1747         u32 portid = NETLINK_CB(skb).portid;
1748         int ret = -EINVAL;
1749         struct sk_buff *reply_skb;
1750         struct nlmsghdr *reply_nlh = NULL;
1751         const struct reply_func *fn;
1752
1753         if ((nlh->nlmsg_type == RTM_SETDCB) && !netlink_capable(skb, CAP_NET_ADMIN))
1754                 return -EPERM;
1755
1756         ret = nlmsg_parse_deprecated(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
1757                                      dcbnl_rtnl_policy, extack);
1758         if (ret < 0)
1759                 return ret;
1760
1761         if (dcb->cmd > DCB_CMD_MAX)
1762                 return -EINVAL;
1763
1764         /* check if a reply function has been defined for the command */
1765         fn = &reply_funcs[dcb->cmd];
1766         if (!fn->cb)
1767                 return -EOPNOTSUPP;
1768         if (fn->type == RTM_SETDCB && !netlink_capable(skb, CAP_NET_ADMIN))
1769                 return -EPERM;
1770
1771         if (!tb[DCB_ATTR_IFNAME])
1772                 return -EINVAL;
1773
1774         netdev = __dev_get_by_name(net, nla_data(tb[DCB_ATTR_IFNAME]));
1775         if (!netdev)
1776                 return -ENODEV;
1777
1778         if (!netdev->dcbnl_ops)
1779                 return -EOPNOTSUPP;
1780
1781         reply_skb = dcbnl_newmsg(fn->type, dcb->cmd, portid, nlh->nlmsg_seq,
1782                                  nlh->nlmsg_flags, &reply_nlh);
1783         if (!reply_skb)
1784                 return -ENOMEM;
1785
1786         ret = fn->cb(netdev, nlh, nlh->nlmsg_seq, tb, reply_skb);
1787         if (ret < 0) {
1788                 nlmsg_free(reply_skb);
1789                 goto out;
1790         }
1791
1792         nlmsg_end(reply_skb, reply_nlh);
1793
1794         ret = rtnl_unicast(reply_skb, net, portid);
1795 out:
1796         return ret;
1797 }
1798
1799 static struct dcb_app_type *dcb_app_lookup(const struct dcb_app *app,
1800                                            int ifindex, int prio)
1801 {
1802         struct dcb_app_type *itr;
1803
1804         list_for_each_entry(itr, &dcb_app_list, list) {
1805                 if (itr->app.selector == app->selector &&
1806                     itr->app.protocol == app->protocol &&
1807                     itr->ifindex == ifindex &&
1808                     ((prio == -1) || itr->app.priority == prio))
1809                         return itr;
1810         }
1811
1812         return NULL;
1813 }
1814
1815 static int dcb_app_add(const struct dcb_app *app, int ifindex)
1816 {
1817         struct dcb_app_type *entry;
1818
1819         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
1820         if (!entry)
1821                 return -ENOMEM;
1822
1823         memcpy(&entry->app, app, sizeof(*app));
1824         entry->ifindex = ifindex;
1825         list_add(&entry->list, &dcb_app_list);
1826
1827         return 0;
1828 }
1829
1830 /**
1831  * dcb_getapp - retrieve the DCBX application user priority
1832  * @dev: network interface
1833  * @app: application to get user priority of
1834  *
1835  * On success returns a non-zero 802.1p user priority bitmap
1836  * otherwise returns 0 as the invalid user priority bitmap to
1837  * indicate an error.
1838  */
1839 u8 dcb_getapp(struct net_device *dev, struct dcb_app *app)
1840 {
1841         struct dcb_app_type *itr;
1842         u8 prio = 0;
1843
1844         spin_lock_bh(&dcb_lock);
1845         itr = dcb_app_lookup(app, dev->ifindex, -1);
1846         if (itr)
1847                 prio = itr->app.priority;
1848         spin_unlock_bh(&dcb_lock);
1849
1850         return prio;
1851 }
1852 EXPORT_SYMBOL(dcb_getapp);
1853
1854 /**
1855  * dcb_setapp - add CEE dcb application data to app list
1856  * @dev: network interface
1857  * @new: application data to add
1858  *
1859  * Priority 0 is an invalid priority in CEE spec. This routine
1860  * removes applications from the app list if the priority is
1861  * set to zero. Priority is expected to be 8-bit 802.1p user priority bitmap
1862  */
1863 int dcb_setapp(struct net_device *dev, struct dcb_app *new)
1864 {
1865         struct dcb_app_type *itr;
1866         struct dcb_app_type event;
1867         int err = 0;
1868
1869         event.ifindex = dev->ifindex;
1870         memcpy(&event.app, new, sizeof(event.app));
1871         if (dev->dcbnl_ops->getdcbx)
1872                 event.dcbx = dev->dcbnl_ops->getdcbx(dev);
1873
1874         spin_lock_bh(&dcb_lock);
1875         /* Search for existing match and replace */
1876         itr = dcb_app_lookup(new, dev->ifindex, -1);
1877         if (itr) {
1878                 if (new->priority)
1879                         itr->app.priority = new->priority;
1880                 else {
1881                         list_del(&itr->list);
1882                         kfree(itr);
1883                 }
1884                 goto out;
1885         }
1886         /* App type does not exist add new application type */
1887         if (new->priority)
1888                 err = dcb_app_add(new, dev->ifindex);
1889 out:
1890         spin_unlock_bh(&dcb_lock);
1891         if (!err)
1892                 call_dcbevent_notifiers(DCB_APP_EVENT, &event);
1893         return err;
1894 }
1895 EXPORT_SYMBOL(dcb_setapp);
1896
1897 /**
1898  * dcb_ieee_getapp_mask - retrieve the IEEE DCB application priority
1899  * @dev: network interface
1900  * @app: where to store the retrieve application data
1901  *
1902  * Helper routine which on success returns a non-zero 802.1Qaz user
1903  * priority bitmap otherwise returns 0 to indicate the dcb_app was
1904  * not found in APP list.
1905  */
1906 u8 dcb_ieee_getapp_mask(struct net_device *dev, struct dcb_app *app)
1907 {
1908         struct dcb_app_type *itr;
1909         u8 prio = 0;
1910
1911         spin_lock_bh(&dcb_lock);
1912         itr = dcb_app_lookup(app, dev->ifindex, -1);
1913         if (itr)
1914                 prio |= 1 << itr->app.priority;
1915         spin_unlock_bh(&dcb_lock);
1916
1917         return prio;
1918 }
1919 EXPORT_SYMBOL(dcb_ieee_getapp_mask);
1920
1921 /**
1922  * dcb_ieee_setapp - add IEEE dcb application data to app list
1923  * @dev: network interface
1924  * @new: application data to add
1925  *
1926  * This adds Application data to the list. Multiple application
1927  * entries may exists for the same selector and protocol as long
1928  * as the priorities are different. Priority is expected to be a
1929  * 3-bit unsigned integer
1930  */
1931 int dcb_ieee_setapp(struct net_device *dev, struct dcb_app *new)
1932 {
1933         struct dcb_app_type event;
1934         int err = 0;
1935
1936         event.ifindex = dev->ifindex;
1937         memcpy(&event.app, new, sizeof(event.app));
1938         if (dev->dcbnl_ops->getdcbx)
1939                 event.dcbx = dev->dcbnl_ops->getdcbx(dev);
1940
1941         spin_lock_bh(&dcb_lock);
1942         /* Search for existing match and abort if found */
1943         if (dcb_app_lookup(new, dev->ifindex, new->priority)) {
1944                 err = -EEXIST;
1945                 goto out;
1946         }
1947
1948         err = dcb_app_add(new, dev->ifindex);
1949 out:
1950         spin_unlock_bh(&dcb_lock);
1951         if (!err)
1952                 call_dcbevent_notifiers(DCB_APP_EVENT, &event);
1953         return err;
1954 }
1955 EXPORT_SYMBOL(dcb_ieee_setapp);
1956
1957 /**
1958  * dcb_ieee_delapp - delete IEEE dcb application data from list
1959  * @dev: network interface
1960  * @del: application data to delete
1961  *
1962  * This removes a matching APP data from the APP list
1963  */
1964 int dcb_ieee_delapp(struct net_device *dev, struct dcb_app *del)
1965 {
1966         struct dcb_app_type *itr;
1967         struct dcb_app_type event;
1968         int err = -ENOENT;
1969
1970         event.ifindex = dev->ifindex;
1971         memcpy(&event.app, del, sizeof(event.app));
1972         if (dev->dcbnl_ops->getdcbx)
1973                 event.dcbx = dev->dcbnl_ops->getdcbx(dev);
1974
1975         spin_lock_bh(&dcb_lock);
1976         /* Search for existing match and remove it. */
1977         if ((itr = dcb_app_lookup(del, dev->ifindex, del->priority))) {
1978                 list_del(&itr->list);
1979                 kfree(itr);
1980                 err = 0;
1981         }
1982
1983         spin_unlock_bh(&dcb_lock);
1984         if (!err)
1985                 call_dcbevent_notifiers(DCB_APP_EVENT, &event);
1986         return err;
1987 }
1988 EXPORT_SYMBOL(dcb_ieee_delapp);
1989
1990 /*
1991  * dcb_ieee_getapp_prio_dscp_mask_map - For a given device, find mapping from
1992  * priorities to the DSCP values assigned to that priority. Initialize p_map
1993  * such that each map element holds a bit mask of DSCP values configured for
1994  * that priority by APP entries.
1995  */
1996 void dcb_ieee_getapp_prio_dscp_mask_map(const struct net_device *dev,
1997                                         struct dcb_ieee_app_prio_map *p_map)
1998 {
1999         int ifindex = dev->ifindex;
2000         struct dcb_app_type *itr;
2001         u8 prio;
2002
2003         memset(p_map->map, 0, sizeof(p_map->map));
2004
2005         spin_lock_bh(&dcb_lock);
2006         list_for_each_entry(itr, &dcb_app_list, list) {
2007                 if (itr->ifindex == ifindex &&
2008                     itr->app.selector == IEEE_8021QAZ_APP_SEL_DSCP &&
2009                     itr->app.protocol < 64 &&
2010                     itr->app.priority < IEEE_8021QAZ_MAX_TCS) {
2011                         prio = itr->app.priority;
2012                         p_map->map[prio] |= 1ULL << itr->app.protocol;
2013                 }
2014         }
2015         spin_unlock_bh(&dcb_lock);
2016 }
2017 EXPORT_SYMBOL(dcb_ieee_getapp_prio_dscp_mask_map);
2018
2019 /*
2020  * dcb_ieee_getapp_dscp_prio_mask_map - For a given device, find mapping from
2021  * DSCP values to the priorities assigned to that DSCP value. Initialize p_map
2022  * such that each map element holds a bit mask of priorities configured for a
2023  * given DSCP value by APP entries.
2024  */
2025 void
2026 dcb_ieee_getapp_dscp_prio_mask_map(const struct net_device *dev,
2027                                    struct dcb_ieee_app_dscp_map *p_map)
2028 {
2029         int ifindex = dev->ifindex;
2030         struct dcb_app_type *itr;
2031
2032         memset(p_map->map, 0, sizeof(p_map->map));
2033
2034         spin_lock_bh(&dcb_lock);
2035         list_for_each_entry(itr, &dcb_app_list, list) {
2036                 if (itr->ifindex == ifindex &&
2037                     itr->app.selector == IEEE_8021QAZ_APP_SEL_DSCP &&
2038                     itr->app.protocol < 64 &&
2039                     itr->app.priority < IEEE_8021QAZ_MAX_TCS)
2040                         p_map->map[itr->app.protocol] |= 1 << itr->app.priority;
2041         }
2042         spin_unlock_bh(&dcb_lock);
2043 }
2044 EXPORT_SYMBOL(dcb_ieee_getapp_dscp_prio_mask_map);
2045
2046 /*
2047  * Per 802.1Q-2014, the selector value of 1 is used for matching on Ethernet
2048  * type, with valid PID values >= 1536. A special meaning is then assigned to
2049  * protocol value of 0: "default priority. For use when priority is not
2050  * otherwise specified".
2051  *
2052  * dcb_ieee_getapp_default_prio_mask - For a given device, find all APP entries
2053  * of the form {$PRIO, ETHERTYPE, 0} and construct a bit mask of all default
2054  * priorities set by these entries.
2055  */
2056 u8 dcb_ieee_getapp_default_prio_mask(const struct net_device *dev)
2057 {
2058         int ifindex = dev->ifindex;
2059         struct dcb_app_type *itr;
2060         u8 mask = 0;
2061
2062         spin_lock_bh(&dcb_lock);
2063         list_for_each_entry(itr, &dcb_app_list, list) {
2064                 if (itr->ifindex == ifindex &&
2065                     itr->app.selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
2066                     itr->app.protocol == 0 &&
2067                     itr->app.priority < IEEE_8021QAZ_MAX_TCS)
2068                         mask |= 1 << itr->app.priority;
2069         }
2070         spin_unlock_bh(&dcb_lock);
2071
2072         return mask;
2073 }
2074 EXPORT_SYMBOL(dcb_ieee_getapp_default_prio_mask);
2075
2076 static void dcbnl_flush_dev(struct net_device *dev)
2077 {
2078         struct dcb_app_type *itr, *tmp;
2079
2080         spin_lock_bh(&dcb_lock);
2081
2082         list_for_each_entry_safe(itr, tmp, &dcb_app_list, list) {
2083                 if (itr->ifindex == dev->ifindex) {
2084                         list_del(&itr->list);
2085                         kfree(itr);
2086                 }
2087         }
2088
2089         spin_unlock_bh(&dcb_lock);
2090 }
2091
2092 static int dcbnl_netdevice_event(struct notifier_block *nb,
2093                                  unsigned long event, void *ptr)
2094 {
2095         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2096
2097         switch (event) {
2098         case NETDEV_UNREGISTER:
2099                 if (!dev->dcbnl_ops)
2100                         return NOTIFY_DONE;
2101
2102                 dcbnl_flush_dev(dev);
2103
2104                 return NOTIFY_OK;
2105         default:
2106                 return NOTIFY_DONE;
2107         }
2108 }
2109
2110 static struct notifier_block dcbnl_nb __read_mostly = {
2111         .notifier_call  = dcbnl_netdevice_event,
2112 };
2113
2114 static int __init dcbnl_init(void)
2115 {
2116         int err;
2117
2118         err = register_netdevice_notifier(&dcbnl_nb);
2119         if (err)
2120                 return err;
2121
2122         rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL, 0);
2123         rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL, 0);
2124
2125         return 0;
2126 }
2127 device_initcall(dcbnl_init);