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Linux/net/dcb/dcbnl.c

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

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