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

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