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Linux/net/dcb/dcbnl.c

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

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