net/dcb/dcbnl.c

   1 /*
   2  * Copyright (c) 2008, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Author: Lucy Liu <lucy.liu@intel.com>
  18  */
  19
  20 #include <linux/netdevice.h>
  21 #include <linux/netlink.h>
  22 #include <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 <net/sock.h>
  29
  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 MODULE_AUTHOR("Lucy Liu, <lucy.liu@intel.com>");
  53 MODULE_DESCRIPTION("Data Center Bridging netlink interface");
  54 MODULE_LICENSE("GPL");
  55
  56 /**************** DCB attribute policies *************************************/
  57
  58 /* DCB netlink attributes policy */
  59 static const struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {
  60         [DCB_ATTR_IFNAME]      = {.type = NLA_NUL_STRING, .len = IFNAMSIZ - 1},
  61         [DCB_ATTR_STATE]       = {.type = NLA_U8},
  62         [DCB_ATTR_PFC_CFG]     = {.type = NLA_NESTED},
  63         [DCB_ATTR_PG_CFG]      = {.type = NLA_NESTED},
  64         [DCB_ATTR_SET_ALL]     = {.type = NLA_U8},
  65         [DCB_ATTR_PERM_HWADDR] = {.type = NLA_FLAG},
  66         [DCB_ATTR_CAP]         = {.type = NLA_NESTED},
  67         [DCB_ATTR_PFC_STATE]   = {.type = NLA_U8},
  68         [DCB_ATTR_BCN]         = {.type = NLA_NESTED},
  69         [DCB_ATTR_APP]         = {.type = NLA_NESTED},
  70         [DCB_ATTR_IEEE]        = {.type = NLA_NESTED},
  71         [DCB_ATTR_DCBX]        = {.type = NLA_U8},
  72         [DCB_ATTR_FEATCFG]     = {.type = NLA_NESTED},
  73 };
  74
  75 /* DCB priority flow control to User Priority nested attributes */
  76 static const struct nla_policy dcbnl_pfc_up_nest[DCB_PFC_UP_ATTR_MAX + 1] = {
  77         [DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},
  78         [DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},
  79         [DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},
  80         [DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},
  81         [DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},
  82         [DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},
  83         [DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},
  84         [DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},
  85         [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},
  86 };
  87
  88 /* DCB priority grouping nested attributes */
  89 static const struct nla_policy dcbnl_pg_nest[DCB_PG_ATTR_MAX + 1] = {
  90         [DCB_PG_ATTR_TC_0]      = {.type = NLA_NESTED},
  91         [DCB_PG_ATTR_TC_1]      = {.type = NLA_NESTED},
  92         [DCB_PG_ATTR_TC_2]      = {.type = NLA_NESTED},
  93         [DCB_PG_ATTR_TC_3]      = {.type = NLA_NESTED},
  94         [DCB_PG_ATTR_TC_4]      = {.type = NLA_NESTED},
  95         [DCB_PG_ATTR_TC_5]      = {.type = NLA_NESTED},
  96         [DCB_PG_ATTR_TC_6]      = {.type = NLA_NESTED},
  97         [DCB_PG_ATTR_TC_7]      = {.type = NLA_NESTED},
  98         [DCB_PG_ATTR_TC_ALL]    = {.type = NLA_NESTED},
  99         [DCB_PG_ATTR_BW_ID_0]   = {.type = NLA_U8},
 100         [DCB_PG_ATTR_BW_ID_1]   = {.type = NLA_U8},
 101         [DCB_PG_ATTR_BW_ID_2]   = {.type = NLA_U8},
 102         [DCB_PG_ATTR_BW_ID_3]   = {.type = NLA_U8},
 103         [DCB_PG_ATTR_BW_ID_4]   = {.type = NLA_U8},
 104         [DCB_PG_ATTR_BW_ID_5]   = {.type = NLA_U8},
 105         [DCB_PG_ATTR_BW_ID_6]   = {.type = NLA_U8},
 106         [DCB_PG_ATTR_BW_ID_7]   = {.type = NLA_U8},
 107         [DCB_PG_ATTR_BW_ID_ALL] = {.type = NLA_FLAG},
 108 };
 109
 110 /* DCB traffic class nested attributes. */
 111 static const struct nla_policy dcbnl_tc_param_nest[DCB_TC_ATTR_PARAM_MAX + 1] = {
 112         [DCB_TC_ATTR_PARAM_PGID]            = {.type = NLA_U8},
 113         [DCB_TC_ATTR_PARAM_UP_MAPPING]      = {.type = NLA_U8},
 114         [DCB_TC_ATTR_PARAM_STRICT_PRIO]     = {.type = NLA_U8},
 115         [DCB_TC_ATTR_PARAM_BW_PCT]          = {.type = NLA_U8},
 116         [DCB_TC_ATTR_PARAM_ALL]             = {.type = NLA_FLAG},
 117 };
 118
 119 /* DCB capabilities nested attributes. */
 120 static const struct nla_policy dcbnl_cap_nest[DCB_CAP_ATTR_MAX + 1] = {
 121         [DCB_CAP_ATTR_ALL]     = {.type = NLA_FLAG},
 122         [DCB_CAP_ATTR_PG]      = {.type = NLA_U8},
 123         [DCB_CAP_ATTR_PFC]     = {.type = NLA_U8},
 124         [DCB_CAP_ATTR_UP2TC]   = {.type = NLA_U8},
 125         [DCB_CAP_ATTR_PG_TCS]  = {.type = NLA_U8},
 126         [DCB_CAP_ATTR_PFC_TCS] = {.type = NLA_U8},
 127         [DCB_CAP_ATTR_GSP]     = {.type = NLA_U8},
 128         [DCB_CAP_ATTR_BCN]     = {.type = NLA_U8},
 129         [DCB_CAP_ATTR_DCBX]    = {.type = NLA_U8},
 130 };
 131
 132 /* DCB capabilities nested attributes. */
 133 static const struct nla_policy dcbnl_numtcs_nest[DCB_NUMTCS_ATTR_MAX + 1] = {
 134         [DCB_NUMTCS_ATTR_ALL]     = {.type = NLA_FLAG},
 135         [DCB_NUMTCS_ATTR_PG]      = {.type = NLA_U8},
 136         [DCB_NUMTCS_ATTR_PFC]     = {.type = NLA_U8},
 137 };
 138
 139 /* DCB BCN nested attributes. */
 140 static const struct nla_policy dcbnl_bcn_nest[DCB_BCN_ATTR_MAX + 1] = {
 141         [DCB_BCN_ATTR_RP_0]         = {.type = NLA_U8},
 142         [DCB_BCN_ATTR_RP_1]         = {.type = NLA_U8},
 143         [DCB_BCN_ATTR_RP_2]         = {.type = NLA_U8},
 144         [DCB_BCN_ATTR_RP_3]         = {.type = NLA_U8},
 145         [DCB_BCN_ATTR_RP_4]         = {.type = NLA_U8},
 146         [DCB_BCN_ATTR_RP_5]         = {.type = NLA_U8},
 147         [DCB_BCN_ATTR_RP_6]         = {.type = NLA_U8},
 148         [DCB_BCN_ATTR_RP_7]         = {.type = NLA_U8},
 149         [DCB_BCN_ATTR_RP_ALL]       = {.type = NLA_FLAG},
 150         [DCB_BCN_ATTR_BCNA_0]       = {.type = NLA_U32},
 151         [DCB_BCN_ATTR_BCNA_1]       = {.type = NLA_U32},
 152         [DCB_BCN_ATTR_ALPHA]        = {.type = NLA_U32},
 153         [DCB_BCN_ATTR_BETA]         = {.type = NLA_U32},
 154         [DCB_BCN_ATTR_GD]           = {.type = NLA_U32},
 155         [DCB_BCN_ATTR_GI]           = {.type = NLA_U32},
 156         [DCB_BCN_ATTR_TMAX]         = {.type = NLA_U32},
 157         [DCB_BCN_ATTR_TD]           = {.type = NLA_U32},
 158         [DCB_BCN_ATTR_RMIN]         = {.type = NLA_U32},
 159         [DCB_BCN_ATTR_W]            = {.type = NLA_U32},
 160         [DCB_BCN_ATTR_RD]           = {.type = NLA_U32},
 161         [DCB_BCN_ATTR_RU]           = {.type = NLA_U32},
 162         [DCB_BCN_ATTR_WRTT]         = {.type = NLA_U32},
 163         [DCB_BCN_ATTR_RI]           = {.type = NLA_U32},
 164         [DCB_BCN_ATTR_C]            = {.type = NLA_U32},
 165         [DCB_BCN_ATTR_ALL]          = {.type = NLA_FLAG},
 166 };
 167
 168 /* DCB APP nested attributes. */
 169 static const struct nla_policy dcbnl_app_nest[DCB_APP_ATTR_MAX + 1] = {
 170         [DCB_APP_ATTR_IDTYPE]       = {.type = NLA_U8},
 171         [DCB_APP_ATTR_ID]           = {.type = NLA_U16},
 172         [DCB_APP_ATTR_PRIORITY]     = {.type = NLA_U8},
 173 };
 174
 175 /* IEEE 802.1Qaz nested attributes. */
 176 static const struct nla_policy dcbnl_ieee_policy[DCB_ATTR_IEEE_MAX + 1] = {
 177         [DCB_ATTR_IEEE_ETS]         = {.len = sizeof(struct ieee_ets)},
 178         [DCB_ATTR_IEEE_PFC]         = {.len = sizeof(struct ieee_pfc)},
 179         [DCB_ATTR_IEEE_APP_TABLE]   = {.type = NLA_NESTED},
 180 };
 181
 182 static const struct nla_policy dcbnl_ieee_app[DCB_ATTR_IEEE_APP_MAX + 1] = {
 183         [DCB_ATTR_IEEE_APP]         = {.len = sizeof(struct dcb_app)},
 184 };
 185
 186 /* DCB number of traffic classes nested attributes. */
 187 static const struct nla_policy dcbnl_featcfg_nest[DCB_FEATCFG_ATTR_MAX + 1] = {
 188         [DCB_FEATCFG_ATTR_ALL]      = {.type = NLA_FLAG},
 189         [DCB_FEATCFG_ATTR_PG]       = {.type = NLA_U8},
 190         [DCB_FEATCFG_ATTR_PFC]      = {.type = NLA_U8},
 191         [DCB_FEATCFG_ATTR_APP]      = {.type = NLA_U8},
 192 };
 193
 194 static LIST_HEAD(dcb_app_list);
 195 static DEFINE_SPINLOCK(dcb_lock);
 196
 197 /* standard netlink reply call */
 198 static int dcbnl_reply(u8 value, u8 event, u8 cmd, u8 attr, u32 pid,
 199                        u32 seq, u16 flags)
 200 {
 201         struct sk_buff *dcbnl_skb;
 202         struct dcbmsg *dcb;
 203         struct nlmsghdr *nlh;
 204         int ret = -EINVAL;
 205
 206         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 207         if (!dcbnl_skb)
 208                 return ret;
 209
 210         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, event, sizeof(*dcb), flags);
 211
 212         dcb = NLMSG_DATA(nlh);
 213         dcb->dcb_family = AF_UNSPEC;
 214         dcb->cmd = cmd;
 215         dcb->dcb_pad = 0;
 216
 217         ret = nla_put_u8(dcbnl_skb, attr, value);
 218         if (ret)
 219                 goto err;
 220
 221         /* end the message, assign the nlmsg_len. */
 222         nlmsg_end(dcbnl_skb, nlh);
 223         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 224         if (ret)
 225                 return -EINVAL;
 226
 227         return 0;
 228 nlmsg_failure:
 229 err:
 230         kfree_skb(dcbnl_skb);
 231         return ret;
 232 }
 233
 234 static int dcbnl_getstate(struct net_device *netdev, struct nlattr **tb,
 235                           u32 pid, u32 seq, u16 flags)
 236 {
 237         int ret = -EINVAL;
 238
 239         /* if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->getstate) */
 240         if (!netdev->dcbnl_ops->getstate)
 241                 return ret;
 242
 243         ret = dcbnl_reply(netdev->dcbnl_ops->getstate(netdev), RTM_GETDCB,
 244                           DCB_CMD_GSTATE, DCB_ATTR_STATE, pid, seq, flags);
 245
 246         return ret;
 247 }
 248
 249 static int dcbnl_getpfccfg(struct net_device *netdev, struct nlattr **tb,
 250                            u32 pid, u32 seq, u16 flags)
 251 {
 252         struct sk_buff *dcbnl_skb;
 253         struct nlmsghdr *nlh;
 254         struct dcbmsg *dcb;
 255         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1], *nest;
 256         u8 value;
 257         int ret = -EINVAL;
 258         int i;
 259         int getall = 0;
 260
 261         if (!tb[DCB_ATTR_PFC_CFG] || !netdev->dcbnl_ops->getpfccfg)
 262                 return ret;
 263
 264         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
 265                                tb[DCB_ATTR_PFC_CFG],
 266                                dcbnl_pfc_up_nest);
 267         if (ret)
 268                 goto err_out;
 269
 270         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 271         if (!dcbnl_skb)
 272                 goto err_out;
 273
 274         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 275
 276         dcb = NLMSG_DATA(nlh);
 277         dcb->dcb_family = AF_UNSPEC;
 278         dcb->cmd = DCB_CMD_PFC_GCFG;
 279
 280         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_PFC_CFG);
 281         if (!nest)
 282                 goto err;
 283
 284         if (data[DCB_PFC_UP_ATTR_ALL])
 285                 getall = 1;
 286
 287         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 288                 if (!getall && !data[i])
 289                         continue;
 290
 291                 netdev->dcbnl_ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0,
 292                                              &value);
 293                 ret = nla_put_u8(dcbnl_skb, i, value);
 294
 295                 if (ret) {
 296                         nla_nest_cancel(dcbnl_skb, nest);
 297                         goto err;
 298                 }
 299         }
 300         nla_nest_end(dcbnl_skb, nest);
 301
 302         nlmsg_end(dcbnl_skb, nlh);
 303
 304         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 305         if (ret)
 306                 goto err_out;
 307
 308         return 0;
 309 nlmsg_failure:
 310 err:
 311         kfree_skb(dcbnl_skb);
 312 err_out:
 313         return -EINVAL;
 314 }
 315
 316 static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlattr **tb,
 317                                 u32 pid, u32 seq, u16 flags)
 318 {
 319         struct sk_buff *dcbnl_skb;
 320         struct nlmsghdr *nlh;
 321         struct dcbmsg *dcb;
 322         u8 perm_addr[MAX_ADDR_LEN];
 323         int ret = -EINVAL;
 324
 325         if (!netdev->dcbnl_ops->getpermhwaddr)
 326                 return ret;
 327
 328         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 329         if (!dcbnl_skb)
 330                 goto err_out;
 331
 332         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 333
 334         dcb = NLMSG_DATA(nlh);
 335         dcb->dcb_family = AF_UNSPEC;
 336         dcb->cmd = DCB_CMD_GPERM_HWADDR;
 337
 338         netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);
 339
 340         ret = nla_put(dcbnl_skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr),
 341                       perm_addr);
 342
 343         nlmsg_end(dcbnl_skb, nlh);
 344
 345         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 346         if (ret)
 347                 goto err_out;
 348
 349         return 0;
 350
 351 nlmsg_failure:
 352         kfree_skb(dcbnl_skb);
 353 err_out:
 354         return -EINVAL;
 355 }
 356
 357 static int dcbnl_getcap(struct net_device *netdev, struct nlattr **tb,
 358                         u32 pid, u32 seq, u16 flags)
 359 {
 360         struct sk_buff *dcbnl_skb;
 361         struct nlmsghdr *nlh;
 362         struct dcbmsg *dcb;
 363         struct nlattr *data[DCB_CAP_ATTR_MAX + 1], *nest;
 364         u8 value;
 365         int ret = -EINVAL;
 366         int i;
 367         int getall = 0;
 368
 369         if (!tb[DCB_ATTR_CAP] || !netdev->dcbnl_ops->getcap)
 370                 return ret;
 371
 372         ret = nla_parse_nested(data, DCB_CAP_ATTR_MAX, tb[DCB_ATTR_CAP],
 373                                dcbnl_cap_nest);
 374         if (ret)
 375                 goto err_out;
 376
 377         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 378         if (!dcbnl_skb)
 379                 goto err_out;
 380
 381         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 382
 383         dcb = NLMSG_DATA(nlh);
 384         dcb->dcb_family = AF_UNSPEC;
 385         dcb->cmd = DCB_CMD_GCAP;
 386
 387         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_CAP);
 388         if (!nest)
 389                 goto err;
 390
 391         if (data[DCB_CAP_ATTR_ALL])
 392                 getall = 1;
 393
 394         for (i = DCB_CAP_ATTR_ALL+1; i <= DCB_CAP_ATTR_MAX; i++) {
 395                 if (!getall && !data[i])
 396                         continue;
 397
 398                 if (!netdev->dcbnl_ops->getcap(netdev, i, &value)) {
 399                         ret = nla_put_u8(dcbnl_skb, i, value);
 400
 401                         if (ret) {
 402                                 nla_nest_cancel(dcbnl_skb, nest);
 403                                 goto err;
 404                         }
 405                 }
 406         }
 407         nla_nest_end(dcbnl_skb, nest);
 408
 409         nlmsg_end(dcbnl_skb, nlh);
 410
 411         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 412         if (ret)
 413                 goto err_out;
 414
 415         return 0;
 416 nlmsg_failure:
 417 err:
 418         kfree_skb(dcbnl_skb);
 419 err_out:
 420         return -EINVAL;
 421 }
 422
 423 static int dcbnl_getnumtcs(struct net_device *netdev, struct nlattr **tb,
 424                            u32 pid, u32 seq, u16 flags)
 425 {
 426         struct sk_buff *dcbnl_skb;
 427         struct nlmsghdr *nlh;
 428         struct dcbmsg *dcb;
 429         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1], *nest;
 430         u8 value;
 431         int ret = -EINVAL;
 432         int i;
 433         int getall = 0;
 434
 435         if (!tb[DCB_ATTR_NUMTCS] || !netdev->dcbnl_ops->getnumtcs)
 436                 return ret;
 437
 438         ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
 439                                dcbnl_numtcs_nest);
 440         if (ret) {
 441                 ret = -EINVAL;
 442                 goto err_out;
 443         }
 444
 445         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 446         if (!dcbnl_skb) {
 447                 ret = -EINVAL;
 448                 goto err_out;
 449         }
 450
 451         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 452
 453         dcb = NLMSG_DATA(nlh);
 454         dcb->dcb_family = AF_UNSPEC;
 455         dcb->cmd = DCB_CMD_GNUMTCS;
 456
 457         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_NUMTCS);
 458         if (!nest) {
 459                 ret = -EINVAL;
 460                 goto err;
 461         }
 462
 463         if (data[DCB_NUMTCS_ATTR_ALL])
 464                 getall = 1;
 465
 466         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
 467                 if (!getall && !data[i])
 468                         continue;
 469
 470                 ret = netdev->dcbnl_ops->getnumtcs(netdev, i, &value);
 471                 if (!ret) {
 472                         ret = nla_put_u8(dcbnl_skb, i, value);
 473
 474                         if (ret) {
 475                                 nla_nest_cancel(dcbnl_skb, nest);
 476                                 ret = -EINVAL;
 477                                 goto err;
 478                         }
 479                 } else {
 480                         goto err;
 481                 }
 482         }
 483         nla_nest_end(dcbnl_skb, nest);
 484
 485         nlmsg_end(dcbnl_skb, nlh);
 486
 487         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 488         if (ret) {
 489                 ret = -EINVAL;
 490                 goto err_out;
 491         }
 492
 493         return 0;
 494 nlmsg_failure:
 495 err:
 496         kfree_skb(dcbnl_skb);
 497 err_out:
 498         return ret;
 499 }
 500
 501 static int dcbnl_setnumtcs(struct net_device *netdev, struct nlattr **tb,
 502                            u32 pid, u32 seq, u16 flags)
 503 {
 504         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1];
 505         int ret = -EINVAL;
 506         u8 value;
 507         int i;
 508
 509         if (!tb[DCB_ATTR_NUMTCS] || !netdev->dcbnl_ops->setnumtcs)
 510                 return ret;
 511
 512         ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
 513                                dcbnl_numtcs_nest);
 514
 515         if (ret) {
 516                 ret = -EINVAL;
 517                 goto err;
 518         }
 519
 520         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
 521                 if (data[i] == NULL)
 522                         continue;
 523
 524                 value = nla_get_u8(data[i]);
 525
 526                 ret = netdev->dcbnl_ops->setnumtcs(netdev, i, value);
 527
 528                 if (ret)
 529                         goto operr;
 530         }
 531
 532 operr:
 533         ret = dcbnl_reply(!!ret, RTM_SETDCB, DCB_CMD_SNUMTCS,
 534                           DCB_ATTR_NUMTCS, pid, seq, flags);
 535
 536 err:
 537         return ret;
 538 }
 539
 540 static int dcbnl_getpfcstate(struct net_device *netdev, struct nlattr **tb,
 541                              u32 pid, u32 seq, u16 flags)
 542 {
 543         int ret = -EINVAL;
 544
 545         if (!netdev->dcbnl_ops->getpfcstate)
 546                 return ret;
 547
 548         ret = dcbnl_reply(netdev->dcbnl_ops->getpfcstate(netdev), RTM_GETDCB,
 549                           DCB_CMD_PFC_GSTATE, DCB_ATTR_PFC_STATE,
 550                           pid, seq, flags);
 551
 552         return ret;
 553 }
 554
 555 static int dcbnl_setpfcstate(struct net_device *netdev, struct nlattr **tb,
 556                              u32 pid, u32 seq, u16 flags)
 557 {
 558         int ret = -EINVAL;
 559         u8 value;
 560
 561         if (!tb[DCB_ATTR_PFC_STATE] || !netdev->dcbnl_ops->setpfcstate)
 562                 return ret;
 563
 564         value = nla_get_u8(tb[DCB_ATTR_PFC_STATE]);
 565
 566         netdev->dcbnl_ops->setpfcstate(netdev, value);
 567
 568         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SSTATE, DCB_ATTR_PFC_STATE,
 569                           pid, seq, flags);
 570
 571         return ret;
 572 }
 573
 574 static int dcbnl_getapp(struct net_device *netdev, struct nlattr **tb,
 575                         u32 pid, u32 seq, u16 flags)
 576 {
 577         struct sk_buff *dcbnl_skb;
 578         struct nlmsghdr *nlh;
 579         struct dcbmsg *dcb;
 580         struct nlattr *app_nest;
 581         struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1];
 582         u16 id;
 583         u8 up, idtype;
 584         int ret = -EINVAL;
 585
 586         if (!tb[DCB_ATTR_APP])
 587                 goto out;
 588
 589         ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP],
 590                                dcbnl_app_nest);
 591         if (ret)
 592                 goto out;
 593
 594         ret = -EINVAL;
 595         /* all must be non-null */
 596         if ((!app_tb[DCB_APP_ATTR_IDTYPE]) ||
 597             (!app_tb[DCB_APP_ATTR_ID]))
 598                 goto out;
 599
 600         /* either by eth type or by socket number */
 601         idtype = nla_get_u8(app_tb[DCB_APP_ATTR_IDTYPE]);
 602         if ((idtype != DCB_APP_IDTYPE_ETHTYPE) &&
 603             (idtype != DCB_APP_IDTYPE_PORTNUM))
 604                 goto out;
 605
 606         id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]);
 607
 608         if (netdev->dcbnl_ops->getapp) {
 609                 up = netdev->dcbnl_ops->getapp(netdev, idtype, id);
 610         } else {
 611                 struct dcb_app app = {
 612                                         .selector = idtype,
 613                                         .protocol = id,
 614                                      };
 615                 up = dcb_getapp(netdev, &app);
 616         }
 617
 618         /* send this back */
 619         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 620         if (!dcbnl_skb)
 621                 goto out;
 622
 623         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 624         dcb = NLMSG_DATA(nlh);
 625         dcb->dcb_family = AF_UNSPEC;
 626         dcb->cmd = DCB_CMD_GAPP;
 627
 628         app_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_APP);
 629         if (!app_nest)
 630                 goto out_cancel;
 631
 632         ret = nla_put_u8(dcbnl_skb, DCB_APP_ATTR_IDTYPE, idtype);
 633         if (ret)
 634                 goto out_cancel;
 635
 636         ret = nla_put_u16(dcbnl_skb, DCB_APP_ATTR_ID, id);
 637         if (ret)
 638                 goto out_cancel;
 639
 640         ret = nla_put_u8(dcbnl_skb, DCB_APP_ATTR_PRIORITY, up);
 641         if (ret)
 642                 goto out_cancel;
 643
 644         nla_nest_end(dcbnl_skb, app_nest);
 645         nlmsg_end(dcbnl_skb, nlh);
 646
 647         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 648         if (ret)
 649                 goto nlmsg_failure;
 650
 651         goto out;
 652
 653 out_cancel:
 654         nla_nest_cancel(dcbnl_skb, app_nest);
 655 nlmsg_failure:
 656         kfree_skb(dcbnl_skb);
 657 out:
 658         return ret;
 659 }
 660
 661 static int dcbnl_setapp(struct net_device *netdev, struct nlattr **tb,
 662                         u32 pid, u32 seq, u16 flags)
 663 {
 664         int err, ret = -EINVAL;
 665         u16 id;
 666         u8 up, idtype;
 667         struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1];
 668
 669         if (!tb[DCB_ATTR_APP])
 670                 goto out;
 671
 672         ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP],
 673                                dcbnl_app_nest);
 674         if (ret)
 675                 goto out;
 676
 677         ret = -EINVAL;
 678         /* all must be non-null */
 679         if ((!app_tb[DCB_APP_ATTR_IDTYPE]) ||
 680             (!app_tb[DCB_APP_ATTR_ID]) ||
 681             (!app_tb[DCB_APP_ATTR_PRIORITY]))
 682                 goto out;
 683
 684         /* either by eth type or by socket number */
 685         idtype = nla_get_u8(app_tb[DCB_APP_ATTR_IDTYPE]);
 686         if ((idtype != DCB_APP_IDTYPE_ETHTYPE) &&
 687             (idtype != DCB_APP_IDTYPE_PORTNUM))
 688                 goto out;
 689
 690         id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]);
 691         up = nla_get_u8(app_tb[DCB_APP_ATTR_PRIORITY]);
 692
 693         if (netdev->dcbnl_ops->setapp) {
 694                 err = netdev->dcbnl_ops->setapp(netdev, idtype, id, up);
 695         } else {
 696                 struct dcb_app app;
 697                 app.selector = idtype;
 698                 app.protocol = id;
 699                 app.priority = up;
 700                 err = dcb_setapp(netdev, &app);
 701         }
 702
 703         ret = dcbnl_reply(err, RTM_SETDCB, DCB_CMD_SAPP, DCB_ATTR_APP,
 704                           pid, seq, flags);
 705 out:
 706         return ret;
 707 }
 708
 709 static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlattr **tb,
 710                              u32 pid, u32 seq, u16 flags, int dir)
 711 {
 712         struct sk_buff *dcbnl_skb;
 713         struct nlmsghdr *nlh;
 714         struct dcbmsg *dcb;
 715         struct nlattr *pg_nest, *param_nest, *data;
 716         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 717         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 718         u8 prio, pgid, tc_pct, up_map;
 719         int ret  = -EINVAL;
 720         int getall = 0;
 721         int i;
 722
 723         if (!tb[DCB_ATTR_PG_CFG] ||
 724             !netdev->dcbnl_ops->getpgtccfgtx ||
 725             !netdev->dcbnl_ops->getpgtccfgrx ||
 726             !netdev->dcbnl_ops->getpgbwgcfgtx ||
 727             !netdev->dcbnl_ops->getpgbwgcfgrx)
 728                 return ret;
 729
 730         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
 731                                tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
 732
 733         if (ret)
 734                 goto err_out;
 735
 736         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 737         if (!dcbnl_skb)
 738                 goto err_out;
 739
 740         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
 741
 742         dcb = NLMSG_DATA(nlh);
 743         dcb->dcb_family = AF_UNSPEC;
 744         dcb->cmd = (dir) ? DCB_CMD_PGRX_GCFG : DCB_CMD_PGTX_GCFG;
 745
 746         pg_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_PG_CFG);
 747         if (!pg_nest)
 748                 goto err;
 749
 750         if (pg_tb[DCB_PG_ATTR_TC_ALL])
 751                 getall = 1;
 752
 753         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 754                 if (!getall && !pg_tb[i])
 755                         continue;
 756
 757                 if (pg_tb[DCB_PG_ATTR_TC_ALL])
 758                         data = pg_tb[DCB_PG_ATTR_TC_ALL];
 759                 else
 760                         data = pg_tb[i];
 761                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
 762                                        data, dcbnl_tc_param_nest);
 763                 if (ret)
 764                         goto err_pg;
 765
 766                 param_nest = nla_nest_start(dcbnl_skb, i);
 767                 if (!param_nest)
 768                         goto err_pg;
 769
 770                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 771                 prio = DCB_ATTR_VALUE_UNDEFINED;
 772                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 773                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 774
 775                 if (dir) {
 776                         /* Rx */
 777                         netdev->dcbnl_ops->getpgtccfgrx(netdev,
 778                                                 i - DCB_PG_ATTR_TC_0, &prio,
 779                                                 &pgid, &tc_pct, &up_map);
 780                 } else {
 781                         /* Tx */
 782                         netdev->dcbnl_ops->getpgtccfgtx(netdev,
 783                                                 i - DCB_PG_ATTR_TC_0, &prio,
 784                                                 &pgid, &tc_pct, &up_map);
 785                 }
 786
 787                 if (param_tb[DCB_TC_ATTR_PARAM_PGID] ||
 788                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 789                         ret = nla_put_u8(dcbnl_skb,
 790                                          DCB_TC_ATTR_PARAM_PGID, pgid);
 791                         if (ret)
 792                                 goto err_param;
 793                 }
 794                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING] ||
 795                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 796                         ret = nla_put_u8(dcbnl_skb,
 797                                          DCB_TC_ATTR_PARAM_UP_MAPPING, up_map);
 798                         if (ret)
 799                                 goto err_param;
 800                 }
 801                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO] ||
 802                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 803                         ret = nla_put_u8(dcbnl_skb,
 804                                          DCB_TC_ATTR_PARAM_STRICT_PRIO, prio);
 805                         if (ret)
 806                                 goto err_param;
 807                 }
 808                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT] ||
 809                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
 810                         ret = nla_put_u8(dcbnl_skb, DCB_TC_ATTR_PARAM_BW_PCT,
 811                                          tc_pct);
 812                         if (ret)
 813                                 goto err_param;
 814                 }
 815                 nla_nest_end(dcbnl_skb, param_nest);
 816         }
 817
 818         if (pg_tb[DCB_PG_ATTR_BW_ID_ALL])
 819                 getall = 1;
 820         else
 821                 getall = 0;
 822
 823         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
 824                 if (!getall && !pg_tb[i])
 825                         continue;
 826
 827                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 828
 829                 if (dir) {
 830                         /* Rx */
 831                         netdev->dcbnl_ops->getpgbwgcfgrx(netdev,
 832                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 833                 } else {
 834                         /* Tx */
 835                         netdev->dcbnl_ops->getpgbwgcfgtx(netdev,
 836                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
 837                 }
 838                 ret = nla_put_u8(dcbnl_skb, i, tc_pct);
 839
 840                 if (ret)
 841                         goto err_pg;
 842         }
 843
 844         nla_nest_end(dcbnl_skb, pg_nest);
 845
 846         nlmsg_end(dcbnl_skb, nlh);
 847
 848         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
 849         if (ret)
 850                 goto err_out;
 851
 852         return 0;
 853
 854 err_param:
 855         nla_nest_cancel(dcbnl_skb, param_nest);
 856 err_pg:
 857         nla_nest_cancel(dcbnl_skb, pg_nest);
 858 nlmsg_failure:
 859 err:
 860         kfree_skb(dcbnl_skb);
 861 err_out:
 862         ret  = -EINVAL;
 863         return ret;
 864 }
 865
 866 static int dcbnl_pgtx_getcfg(struct net_device *netdev, struct nlattr **tb,
 867                              u32 pid, u32 seq, u16 flags)
 868 {
 869         return __dcbnl_pg_getcfg(netdev, tb, pid, seq, flags, 0);
 870 }
 871
 872 static int dcbnl_pgrx_getcfg(struct net_device *netdev, struct nlattr **tb,
 873                              u32 pid, u32 seq, u16 flags)
 874 {
 875         return __dcbnl_pg_getcfg(netdev, tb, pid, seq, flags, 1);
 876 }
 877
 878 static int dcbnl_setstate(struct net_device *netdev, struct nlattr **tb,
 879                           u32 pid, u32 seq, u16 flags)
 880 {
 881         int ret = -EINVAL;
 882         u8 value;
 883
 884         if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->setstate)
 885                 return ret;
 886
 887         value = nla_get_u8(tb[DCB_ATTR_STATE]);
 888
 889         ret = dcbnl_reply(netdev->dcbnl_ops->setstate(netdev, value),
 890                           RTM_SETDCB, DCB_CMD_SSTATE, DCB_ATTR_STATE,
 891                           pid, seq, flags);
 892
 893         return ret;
 894 }
 895
 896 static int dcbnl_setpfccfg(struct net_device *netdev, struct nlattr **tb,
 897                            u32 pid, u32 seq, u16 flags)
 898 {
 899         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1];
 900         int i;
 901         int ret = -EINVAL;
 902         u8 value;
 903
 904         if (!tb[DCB_ATTR_PFC_CFG] || !netdev->dcbnl_ops->setpfccfg)
 905                 return ret;
 906
 907         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
 908                                tb[DCB_ATTR_PFC_CFG],
 909                                dcbnl_pfc_up_nest);
 910         if (ret)
 911                 goto err;
 912
 913         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
 914                 if (data[i] == NULL)
 915                         continue;
 916                 value = nla_get_u8(data[i]);
 917                 netdev->dcbnl_ops->setpfccfg(netdev,
 918                         data[i]->nla_type - DCB_PFC_UP_ATTR_0, value);
 919         }
 920
 921         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SCFG, DCB_ATTR_PFC_CFG,
 922                           pid, seq, flags);
 923 err:
 924         return ret;
 925 }
 926
 927 static int dcbnl_setall(struct net_device *netdev, struct nlattr **tb,
 928                         u32 pid, u32 seq, u16 flags)
 929 {
 930         int ret = -EINVAL;
 931
 932         if (!tb[DCB_ATTR_SET_ALL] || !netdev->dcbnl_ops->setall)
 933                 return ret;
 934
 935         ret = dcbnl_reply(netdev->dcbnl_ops->setall(netdev), RTM_SETDCB,
 936                           DCB_CMD_SET_ALL, DCB_ATTR_SET_ALL, pid, seq, flags);
 937
 938         return ret;
 939 }
 940
 941 static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlattr **tb,
 942                              u32 pid, u32 seq, u16 flags, int dir)
 943 {
 944         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
 945         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
 946         int ret = -EINVAL;
 947         int i;
 948         u8 pgid;
 949         u8 up_map;
 950         u8 prio;
 951         u8 tc_pct;
 952
 953         if (!tb[DCB_ATTR_PG_CFG] ||
 954             !netdev->dcbnl_ops->setpgtccfgtx ||
 955             !netdev->dcbnl_ops->setpgtccfgrx ||
 956             !netdev->dcbnl_ops->setpgbwgcfgtx ||
 957             !netdev->dcbnl_ops->setpgbwgcfgrx)
 958                 return ret;
 959
 960         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
 961                                tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
 962         if (ret)
 963                 goto err;
 964
 965         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
 966                 if (!pg_tb[i])
 967                         continue;
 968
 969                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
 970                                        pg_tb[i], dcbnl_tc_param_nest);
 971                 if (ret)
 972                         goto err;
 973
 974                 pgid = DCB_ATTR_VALUE_UNDEFINED;
 975                 prio = DCB_ATTR_VALUE_UNDEFINED;
 976                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
 977                 up_map = DCB_ATTR_VALUE_UNDEFINED;
 978
 979                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO])
 980                         prio =
 981                             nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO]);
 982
 983                 if (param_tb[DCB_TC_ATTR_PARAM_PGID])
 984                         pgid = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_PGID]);
 985
 986                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT])
 987                         tc_pct = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_BW_PCT]);
 988
 989                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING])
 990                         up_map =
 991                              nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING]);
 992
 993                 /* dir: Tx = 0, Rx = 1 */
 994                 if (dir) {
 995                         /* Rx */
 996                         netdev->dcbnl_ops->setpgtccfgrx(netdev,
 997                                 i - DCB_PG_ATTR_TC_0,
 998                                 prio, pgid, tc_pct, up_map);
 999                 } else {
1000                         /* Tx */
1001                         netdev->dcbnl_ops->setpgtccfgtx(netdev,
1002                                 i - DCB_PG_ATTR_TC_0,
1003                                 prio, pgid, tc_pct, up_map);
1004                 }
1005         }
1006
1007         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
1008                 if (!pg_tb[i])
1009                         continue;
1010
1011                 tc_pct = nla_get_u8(pg_tb[i]);
1012
1013                 /* dir: Tx = 0, Rx = 1 */
1014                 if (dir) {
1015                         /* Rx */
1016                         netdev->dcbnl_ops->setpgbwgcfgrx(netdev,
1017                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
1018                 } else {
1019                         /* Tx */
1020                         netdev->dcbnl_ops->setpgbwgcfgtx(netdev,
1021                                          i - DCB_PG_ATTR_BW_ID_0, tc_pct);
1022                 }
1023         }
1024
1025         ret = dcbnl_reply(0, RTM_SETDCB,
1026                           (dir ? DCB_CMD_PGRX_SCFG : DCB_CMD_PGTX_SCFG),
1027                           DCB_ATTR_PG_CFG, pid, seq, flags);
1028
1029 err:
1030         return ret;
1031 }
1032
1033 static int dcbnl_pgtx_setcfg(struct net_device *netdev, struct nlattr **tb,
1034                              u32 pid, u32 seq, u16 flags)
1035 {
1036         return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 0);
1037 }
1038
1039 static int dcbnl_pgrx_setcfg(struct net_device *netdev, struct nlattr **tb,
1040                              u32 pid, u32 seq, u16 flags)
1041 {
1042         return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 1);
1043 }
1044
1045 static int dcbnl_bcn_getcfg(struct net_device *netdev, struct nlattr **tb,
1046                             u32 pid, u32 seq, u16 flags)
1047 {
1048         struct sk_buff *dcbnl_skb;
1049         struct nlmsghdr *nlh;
1050         struct dcbmsg *dcb;
1051         struct nlattr *bcn_nest;
1052         struct nlattr *bcn_tb[DCB_BCN_ATTR_MAX + 1];
1053         u8 value_byte;
1054         u32 value_integer;
1055         int ret  = -EINVAL;
1056         bool getall = false;
1057         int i;
1058
1059         if (!tb[DCB_ATTR_BCN] || !netdev->dcbnl_ops->getbcnrp ||
1060             !netdev->dcbnl_ops->getbcncfg)
1061                 return ret;
1062
1063         ret = nla_parse_nested(bcn_tb, DCB_BCN_ATTR_MAX,
1064                                tb[DCB_ATTR_BCN], dcbnl_bcn_nest);
1065
1066         if (ret)
1067                 goto err_out;
1068
1069         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1070         if (!dcbnl_skb)
1071                 goto err_out;
1072
1073         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
1074
1075         dcb = NLMSG_DATA(nlh);
1076         dcb->dcb_family = AF_UNSPEC;
1077         dcb->cmd = DCB_CMD_BCN_GCFG;
1078
1079         bcn_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_BCN);
1080         if (!bcn_nest)
1081                 goto err;
1082
1083         if (bcn_tb[DCB_BCN_ATTR_ALL])
1084                 getall = true;
1085
1086         for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
1087                 if (!getall && !bcn_tb[i])
1088                         continue;
1089
1090                 netdev->dcbnl_ops->getbcnrp(netdev, i - DCB_BCN_ATTR_RP_0,
1091                                             &value_byte);
1092                 ret = nla_put_u8(dcbnl_skb, i, value_byte);
1093                 if (ret)
1094                         goto err_bcn;
1095         }
1096
1097         for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {
1098                 if (!getall && !bcn_tb[i])
1099                         continue;
1100
1101                 netdev->dcbnl_ops->getbcncfg(netdev, i,
1102                                              &value_integer);
1103                 ret = nla_put_u32(dcbnl_skb, i, value_integer);
1104                 if (ret)
1105                         goto err_bcn;
1106         }
1107
1108         nla_nest_end(dcbnl_skb, bcn_nest);
1109
1110         nlmsg_end(dcbnl_skb, nlh);
1111
1112         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
1113         if (ret)
1114                 goto err_out;
1115
1116         return 0;
1117
1118 err_bcn:
1119         nla_nest_cancel(dcbnl_skb, bcn_nest);
1120 nlmsg_failure:
1121 err:
1122         kfree_skb(dcbnl_skb);
1123 err_out:
1124         ret  = -EINVAL;
1125         return ret;
1126 }
1127
1128 static int dcbnl_bcn_setcfg(struct net_device *netdev, struct nlattr **tb,
1129                             u32 pid, u32 seq, u16 flags)
1130 {
1131         struct nlattr *data[DCB_BCN_ATTR_MAX + 1];
1132         int i;
1133         int ret = -EINVAL;
1134         u8 value_byte;
1135         u32 value_int;
1136
1137         if (!tb[DCB_ATTR_BCN] || !netdev->dcbnl_ops->setbcncfg ||
1138             !netdev->dcbnl_ops->setbcnrp)
1139                 return ret;
1140
1141         ret = nla_parse_nested(data, DCB_BCN_ATTR_MAX,
1142                                tb[DCB_ATTR_BCN],
1143                                dcbnl_pfc_up_nest);
1144         if (ret)
1145                 goto err;
1146
1147         for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
1148                 if (data[i] == NULL)
1149                         continue;
1150                 value_byte = nla_get_u8(data[i]);
1151                 netdev->dcbnl_ops->setbcnrp(netdev,
1152                         data[i]->nla_type - DCB_BCN_ATTR_RP_0, value_byte);
1153         }
1154
1155         for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {
1156                 if (data[i] == NULL)
1157                         continue;
1158                 value_int = nla_get_u32(data[i]);
1159                 netdev->dcbnl_ops->setbcncfg(netdev,
1160                                              i, value_int);
1161         }
1162
1163         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_BCN_SCFG, DCB_ATTR_BCN,
1164                           pid, seq, flags);
1165 err:
1166         return ret;
1167 }
1168
1169 /* Handle IEEE 802.1Qaz SET commands. If any requested operation can not
1170  * be completed the entire msg is aborted and error value is returned.
1171  * No attempt is made to reconcile the case where only part of the
1172  * cmd can be completed.
1173  */
1174 static int dcbnl_ieee_set(struct net_device *netdev, struct nlattr **tb,
1175                           u32 pid, u32 seq, u16 flags)
1176 {
1177         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1178         struct nlattr *ieee[DCB_ATTR_IEEE_MAX + 1];
1179         int err = -EOPNOTSUPP;
1180
1181         if (!ops)
1182                 goto err;
1183
1184         err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX,
1185                                tb[DCB_ATTR_IEEE], dcbnl_ieee_policy);
1186         if (err)
1187                 goto err;
1188
1189         if (ieee[DCB_ATTR_IEEE_ETS] && ops->ieee_setets) {
1190                 struct ieee_ets *ets = nla_data(ieee[DCB_ATTR_IEEE_ETS]);
1191                 err = ops->ieee_setets(netdev, ets);
1192                 if (err)
1193                         goto err;
1194         }
1195
1196         if (ieee[DCB_ATTR_IEEE_PFC] && ops->ieee_setets) {
1197                 struct ieee_pfc *pfc = nla_data(ieee[DCB_ATTR_IEEE_PFC]);
1198                 err = ops->ieee_setpfc(netdev, pfc);
1199                 if (err)
1200                         goto err;
1201         }
1202
1203         if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
1204                 struct nlattr *attr;
1205                 int rem;
1206
1207                 nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
1208                         struct dcb_app *app_data;
1209                         if (nla_type(attr) != DCB_ATTR_IEEE_APP)
1210                                 continue;
1211                         app_data = nla_data(attr);
1212                         if (ops->ieee_setapp)
1213                                 err = ops->ieee_setapp(netdev, app_data);
1214                         else
1215                                 err = dcb_setapp(netdev, app_data);
1216                         if (err)
1217                                 goto err;
1218                 }
1219         }
1220
1221 err:
1222         dcbnl_reply(err, RTM_SETDCB, DCB_CMD_IEEE_SET, DCB_ATTR_IEEE,
1223                     pid, seq, flags);
1224         return err;
1225 }
1226
1227
1228 /* Handle IEEE 802.1Qaz GET commands. */
1229 static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
1230                           u32 pid, u32 seq, u16 flags)
1231 {
1232         struct sk_buff *skb;
1233         struct nlmsghdr *nlh;
1234         struct dcbmsg *dcb;
1235         struct nlattr *ieee, *app;
1236         struct dcb_app_type *itr;
1237         const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
1238         int err;
1239
1240         if (!ops)
1241                 return -EOPNOTSUPP;
1242
1243         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1244         if (!skb)
1245                 return -ENOBUFS;
1246
1247         nlh = NLMSG_NEW(skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
1248
1249         dcb = NLMSG_DATA(nlh);
1250         dcb->dcb_family = AF_UNSPEC;
1251         dcb->cmd = DCB_CMD_IEEE_GET;
1252
1253         NLA_PUT_STRING(skb, DCB_ATTR_IFNAME, netdev->name);
1254
1255         ieee = nla_nest_start(skb, DCB_ATTR_IEEE);
1256         if (!ieee)
1257                 goto nla_put_failure;
1258
1259         if (ops->ieee_getets) {
1260                 struct ieee_ets ets;
1261                 err = ops->ieee_getets(netdev, &ets);
1262                 if (!err)
1263                         NLA_PUT(skb, DCB_ATTR_IEEE_ETS, sizeof(ets), &ets);
1264         }
1265
1266         if (ops->ieee_getpfc) {
1267                 struct ieee_pfc pfc;
1268                 err = ops->ieee_getpfc(netdev, &pfc);
1269                 if (!err)
1270                         NLA_PUT(skb, DCB_ATTR_IEEE_PFC, sizeof(pfc), &pfc);
1271         }
1272
1273         app = nla_nest_start(skb, DCB_ATTR_IEEE_APP_TABLE);
1274         if (!app)
1275                 goto nla_put_failure;
1276
1277         spin_lock(&dcb_lock);
1278         list_for_each_entry(itr, &dcb_app_list, list) {
1279                 if (strncmp(itr->name, netdev->name, IFNAMSIZ) == 0) {
1280                         err = nla_put(skb, DCB_ATTR_IEEE_APP, sizeof(itr->app),
1281                                          &itr->app);
1282                         if (err) {
1283                                 spin_unlock(&dcb_lock);
1284                                 goto nla_put_failure;
1285                         }
1286                 }
1287         }
1288         spin_unlock(&dcb_lock);
1289         nla_nest_end(skb, app);
1290
1291         nla_nest_end(skb, ieee);
1292         nlmsg_end(skb, nlh);
1293
1294         return rtnl_unicast(skb, &init_net, pid);
1295 nla_put_failure:
1296         nlmsg_cancel(skb, nlh);
1297 nlmsg_failure:
1298         kfree_skb(skb);
1299         return -1;
1300 }
1301
1302 /* DCBX configuration */
1303 static int dcbnl_getdcbx(struct net_device *netdev, struct nlattr **tb,
1304                          u32 pid, u32 seq, u16 flags)
1305 {
1306         int ret;
1307
1308         if (!netdev->dcbnl_ops->getdcbx)
1309                 return -EOPNOTSUPP;
1310
1311         ret = dcbnl_reply(netdev->dcbnl_ops->getdcbx(netdev), RTM_GETDCB,
1312                           DCB_CMD_GDCBX, DCB_ATTR_DCBX, pid, seq, flags);
1313
1314         return ret;
1315 }
1316
1317 static int dcbnl_setdcbx(struct net_device *netdev, struct nlattr **tb,
1318                          u32 pid, u32 seq, u16 flags)
1319 {
1320         int ret;
1321         u8 value;
1322
1323         if (!netdev->dcbnl_ops->setdcbx)
1324                 return -EOPNOTSUPP;
1325
1326         if (!tb[DCB_ATTR_DCBX])
1327                 return -EINVAL;
1328
1329         value = nla_get_u8(tb[DCB_ATTR_DCBX]);
1330
1331         ret = dcbnl_reply(netdev->dcbnl_ops->setdcbx(netdev, value),
1332                           RTM_SETDCB, DCB_CMD_SDCBX, DCB_ATTR_DCBX,
1333                           pid, seq, flags);
1334
1335         return ret;
1336 }
1337
1338 static int dcbnl_getfeatcfg(struct net_device *netdev, struct nlattr **tb,
1339                             u32 pid, u32 seq, u16 flags)
1340 {
1341         struct sk_buff *dcbnl_skb;
1342         struct nlmsghdr *nlh;
1343         struct dcbmsg *dcb;
1344         struct nlattr *data[DCB_FEATCFG_ATTR_MAX + 1], *nest;
1345         u8 value;
1346         int ret, i;
1347         int getall = 0;
1348
1349         if (!netdev->dcbnl_ops->getfeatcfg)
1350                 return -EOPNOTSUPP;
1351
1352         if (!tb[DCB_ATTR_FEATCFG])
1353                 return -EINVAL;
1354
1355         ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX, tb[DCB_ATTR_FEATCFG],
1356                                dcbnl_featcfg_nest);
1357         if (ret)
1358                 goto err_out;
1359
1360         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1361         if (!dcbnl_skb) {
1362                 ret = -ENOBUFS;
1363                 goto err_out;
1364         }
1365
1366         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
1367
1368         dcb = NLMSG_DATA(nlh);
1369         dcb->dcb_family = AF_UNSPEC;
1370         dcb->cmd = DCB_CMD_GFEATCFG;
1371
1372         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_FEATCFG);
1373         if (!nest) {
1374                 ret = -EMSGSIZE;
1375                 goto nla_put_failure;
1376         }
1377
1378         if (data[DCB_FEATCFG_ATTR_ALL])
1379                 getall = 1;
1380
1381         for (i = DCB_FEATCFG_ATTR_ALL+1; i <= DCB_FEATCFG_ATTR_MAX; i++) {
1382                 if (!getall && !data[i])
1383                         continue;
1384
1385                 ret = netdev->dcbnl_ops->getfeatcfg(netdev, i, &value);
1386                 if (!ret)
1387                         ret = nla_put_u8(dcbnl_skb, i, value);
1388
1389                 if (ret) {
1390                         nla_nest_cancel(dcbnl_skb, nest);
1391                         goto nla_put_failure;
1392                 }
1393         }
1394         nla_nest_end(dcbnl_skb, nest);
1395
1396         nlmsg_end(dcbnl_skb, nlh);
1397
1398         return rtnl_unicast(dcbnl_skb, &init_net, pid);
1399 nla_put_failure:
1400         nlmsg_cancel(dcbnl_skb, nlh);
1401 nlmsg_failure:
1402         kfree_skb(dcbnl_skb);
1403 err_out:
1404         return ret;
1405 }
1406
1407 static int dcbnl_setfeatcfg(struct net_device *netdev, struct nlattr **tb,
1408                             u32 pid, u32 seq, u16 flags)
1409 {
1410         struct nlattr *data[DCB_FEATCFG_ATTR_MAX + 1];
1411         int ret, i;
1412         u8 value;
1413
1414         if (!netdev->dcbnl_ops->setfeatcfg)
1415                 return -ENOTSUPP;
1416
1417         if (!tb[DCB_ATTR_FEATCFG])
1418                 return -EINVAL;
1419
1420         ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX, tb[DCB_ATTR_FEATCFG],
1421                                dcbnl_featcfg_nest);
1422
1423         if (ret)
1424                 goto err;
1425
1426         for (i = DCB_FEATCFG_ATTR_ALL+1; i <= DCB_FEATCFG_ATTR_MAX; i++) {
1427                 if (data[i] == NULL)
1428                         continue;
1429
1430                 value = nla_get_u8(data[i]);
1431
1432                 ret = netdev->dcbnl_ops->setfeatcfg(netdev, i, value);
1433
1434                 if (ret)
1435                         goto err;
1436         }
1437 err:
1438         dcbnl_reply(ret, RTM_SETDCB, DCB_CMD_SFEATCFG, DCB_ATTR_FEATCFG,
1439                     pid, seq, flags);
1440
1441         return ret;
1442 }
1443
1444 static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1445 {
1446         struct net *net = sock_net(skb->sk);
1447         struct net_device *netdev;
1448         struct dcbmsg  *dcb = (struct dcbmsg *)NLMSG_DATA(nlh);
1449         struct nlattr *tb[DCB_ATTR_MAX + 1];
1450         u32 pid = skb ? NETLINK_CB(skb).pid : 0;
1451         int ret = -EINVAL;
1452
1453         if (!net_eq(net, &init_net))
1454                 return -EINVAL;
1455
1456         ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
1457                           dcbnl_rtnl_policy);
1458         if (ret < 0)
1459                 return ret;
1460
1461         if (!tb[DCB_ATTR_IFNAME])
1462                 return -EINVAL;
1463
1464         netdev = dev_get_by_name(&init_net, nla_data(tb[DCB_ATTR_IFNAME]));
1465         if (!netdev)
1466                 return -EINVAL;
1467
1468         if (!netdev->dcbnl_ops)
1469                 goto errout;
1470
1471         switch (dcb->cmd) {
1472         case DCB_CMD_GSTATE:
1473                 ret = dcbnl_getstate(netdev, tb, pid, nlh->nlmsg_seq,
1474                                      nlh->nlmsg_flags);
1475                 goto out;
1476         case DCB_CMD_PFC_GCFG:
1477                 ret = dcbnl_getpfccfg(netdev, tb, pid, nlh->nlmsg_seq,
1478                                       nlh->nlmsg_flags);
1479                 goto out;
1480         case DCB_CMD_GPERM_HWADDR:
1481                 ret = dcbnl_getperm_hwaddr(netdev, tb, pid, nlh->nlmsg_seq,
1482                                            nlh->nlmsg_flags);
1483                 goto out;
1484         case DCB_CMD_PGTX_GCFG:
1485                 ret = dcbnl_pgtx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
1486                                         nlh->nlmsg_flags);
1487                 goto out;
1488         case DCB_CMD_PGRX_GCFG:
1489                 ret = dcbnl_pgrx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
1490                                         nlh->nlmsg_flags);
1491                 goto out;
1492         case DCB_CMD_BCN_GCFG:
1493                 ret = dcbnl_bcn_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
1494                                        nlh->nlmsg_flags);
1495                 goto out;
1496         case DCB_CMD_SSTATE:
1497                 ret = dcbnl_setstate(netdev, tb, pid, nlh->nlmsg_seq,
1498                                      nlh->nlmsg_flags);
1499                 goto out;
1500         case DCB_CMD_PFC_SCFG:
1501                 ret = dcbnl_setpfccfg(netdev, tb, pid, nlh->nlmsg_seq,
1502                                       nlh->nlmsg_flags);
1503                 goto out;
1504
1505         case DCB_CMD_SET_ALL:
1506                 ret = dcbnl_setall(netdev, tb, pid, nlh->nlmsg_seq,
1507                                    nlh->nlmsg_flags);
1508                 goto out;
1509         case DCB_CMD_PGTX_SCFG:
1510                 ret = dcbnl_pgtx_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
1511                                         nlh->nlmsg_flags);
1512                 goto out;
1513         case DCB_CMD_PGRX_SCFG:
1514                 ret = dcbnl_pgrx_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
1515                                         nlh->nlmsg_flags);
1516                 goto out;
1517         case DCB_CMD_GCAP:
1518                 ret = dcbnl_getcap(netdev, tb, pid, nlh->nlmsg_seq,
1519                                    nlh->nlmsg_flags);
1520                 goto out;
1521         case DCB_CMD_GNUMTCS:
1522                 ret = dcbnl_getnumtcs(netdev, tb, pid, nlh->nlmsg_seq,
1523                                       nlh->nlmsg_flags);
1524                 goto out;
1525         case DCB_CMD_SNUMTCS:
1526                 ret = dcbnl_setnumtcs(netdev, tb, pid, nlh->nlmsg_seq,
1527                                       nlh->nlmsg_flags);
1528                 goto out;
1529         case DCB_CMD_PFC_GSTATE:
1530                 ret = dcbnl_getpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
1531                                         nlh->nlmsg_flags);
1532                 goto out;
1533         case DCB_CMD_PFC_SSTATE:
1534                 ret = dcbnl_setpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
1535                                         nlh->nlmsg_flags);
1536                 goto out;
1537         case DCB_CMD_BCN_SCFG:
1538                 ret = dcbnl_bcn_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
1539                                        nlh->nlmsg_flags);
1540                 goto out;
1541         case DCB_CMD_GAPP:
1542                 ret = dcbnl_getapp(netdev, tb, pid, nlh->nlmsg_seq,
1543                                    nlh->nlmsg_flags);
1544                 goto out;
1545         case DCB_CMD_SAPP:
1546                 ret = dcbnl_setapp(netdev, tb, pid, nlh->nlmsg_seq,
1547                                    nlh->nlmsg_flags);
1548                 goto out;
1549         case DCB_CMD_IEEE_SET:
1550                 ret = dcbnl_ieee_set(netdev, tb, pid, nlh->nlmsg_seq,
1551                                  nlh->nlmsg_flags);
1552                 goto out;
1553         case DCB_CMD_IEEE_GET:
1554                 ret = dcbnl_ieee_get(netdev, tb, pid, nlh->nlmsg_seq,
1555                                  nlh->nlmsg_flags);
1556                 goto out;
1557         case DCB_CMD_GDCBX:
1558                 ret = dcbnl_getdcbx(netdev, tb, pid, nlh->nlmsg_seq,
1559                                     nlh->nlmsg_flags);
1560                 goto out;
1561         case DCB_CMD_SDCBX:
1562                 ret = dcbnl_setdcbx(netdev, tb, pid, nlh->nlmsg_seq,
1563                                     nlh->nlmsg_flags);
1564                 goto out;
1565         case DCB_CMD_GFEATCFG:
1566                 ret = dcbnl_getfeatcfg(netdev, tb, pid, nlh->nlmsg_seq,
1567                                        nlh->nlmsg_flags);
1568                 goto out;
1569         case DCB_CMD_SFEATCFG:
1570                 ret = dcbnl_setfeatcfg(netdev, tb, pid, nlh->nlmsg_seq,
1571                                        nlh->nlmsg_flags);
1572                 goto out;
1573         default:
1574                 goto errout;
1575         }
1576 errout:
1577         ret = -EINVAL;
1578 out:
1579         dev_put(netdev);
1580         return ret;
1581 }
1582
1583 /**
1584  * dcb_getapp - retrieve the DCBX application user priority
1585  *
1586  * On success returns a non-zero 802.1p user priority bitmap
1587  * otherwise returns 0 as the invalid user priority bitmap to
1588  * indicate an error.
1589  */
1590 u8 dcb_getapp(struct net_device *dev, struct dcb_app *app)
1591 {
1592         struct dcb_app_type *itr;
1593         u8 prio = 0;
1594
1595         spin_lock(&dcb_lock);
1596         list_for_each_entry(itr, &dcb_app_list, list) {
1597                 if (itr->app.selector == app->selector &&
1598                     itr->app.protocol == app->protocol &&
1599                     (strncmp(itr->name, dev->name, IFNAMSIZ) == 0)) {
1600                         prio = itr->app.priority;
1601                         break;
1602                 }
1603         }
1604         spin_unlock(&dcb_lock);
1605
1606         return prio;
1607 }
1608 EXPORT_SYMBOL(dcb_getapp);
1609
1610 /**
1611  * ixgbe_dcbnl_setapp - add dcb application data to app list
1612  *
1613  * Priority 0 is the default priority this removes applications
1614  * from the app list if the priority is set to zero.
1615  */
1616 u8 dcb_setapp(struct net_device *dev, struct dcb_app *new)
1617 {
1618         struct dcb_app_type *itr;
1619         struct dcb_app_type event;
1620
1621         memcpy(&event.name, dev->name, sizeof(event.name));
1622         memcpy(&event.app, new, sizeof(event.app));
1623
1624         spin_lock(&dcb_lock);
1625         /* Search for existing match and replace */
1626         list_for_each_entry(itr, &dcb_app_list, list) {
1627                 if (itr->app.selector == new->selector &&
1628                     itr->app.protocol == new->protocol &&
1629                     (strncmp(itr->name, dev->name, IFNAMSIZ) == 0)) {
1630                         if (new->priority)
1631                                 itr->app.priority = new->priority;
1632                         else {
1633                                 list_del(&itr->list);
1634                                 kfree(itr);
1635                         }
1636                         goto out;
1637                 }
1638         }
1639         /* App type does not exist add new application type */
1640         if (new->priority) {
1641                 struct dcb_app_type *entry;
1642                 entry = kmalloc(sizeof(struct dcb_app_type), GFP_ATOMIC);
1643                 if (!entry) {
1644                         spin_unlock(&dcb_lock);
1645                         return -ENOMEM;
1646                 }
1647
1648                 memcpy(&entry->app, new, sizeof(*new));
1649                 strncpy(entry->name, dev->name, IFNAMSIZ);
1650                 list_add(&entry->list, &dcb_app_list);
1651         }
1652 out:
1653         spin_unlock(&dcb_lock);
1654         call_dcbevent_notifiers(DCB_APP_EVENT, &event);
1655         return 0;
1656 }
1657 EXPORT_SYMBOL(dcb_setapp);
1658
1659 static void dcb_flushapp(void)
1660 {
1661         struct dcb_app_type *app;
1662         struct dcb_app_type *tmp;
1663
1664         spin_lock(&dcb_lock);
1665         list_for_each_entry_safe(app, tmp, &dcb_app_list, list) {
1666                 list_del(&app->list);
1667                 kfree(app);
1668         }
1669         spin_unlock(&dcb_lock);
1670 }
1671
1672 static int __init dcbnl_init(void)
1673 {
1674         INIT_LIST_HEAD(&dcb_app_list);
1675
1676         rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL);
1677         rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL);
1678
1679         return 0;
1680 }
1681 module_init(dcbnl_init);
1682
1683 static void __exit dcbnl_exit(void)
1684 {
1685         rtnl_unregister(PF_UNSPEC, RTM_GETDCB);
1686         rtnl_unregister(PF_UNSPEC, RTM_SETDCB);
1687         dcb_flushapp();
1688 }
1689 module_exit(dcbnl_exit);