DCB: fix kfree(skb)
[linux-2.6.git] / net / dcb / dcbnl.c
1 /*
2  * Copyright (c) 2008, Intel Corporation.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  *
13  * You should have received a copy of the GNU General Public License along with
14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15  * Place - Suite 330, Boston, MA 02111-1307 USA.
16  *
17  * Author: Lucy Liu <lucy.liu@intel.com>
18  */
19
20 #include <linux/netdevice.h>
21 #include <linux/netlink.h>
22 #include <net/netlink.h>
23 #include <net/rtnetlink.h>
24 #include <linux/dcbnl.h>
25 #include <linux/rtnetlink.h>
26 #include <net/sock.h>
27
28 /**
29  * Data Center Bridging (DCB) is a collection of Ethernet enhancements
30  * intended to allow network traffic with differing requirements
31  * (highly reliable, no drops vs. best effort vs. low latency) to operate
32  * and co-exist on Ethernet.  Current DCB features are:
33  *
34  * Enhanced Transmission Selection (aka Priority Grouping [PG]) - provides a
35  *   framework for assigning bandwidth guarantees to traffic classes.
36  *
37  * Priority-based Flow Control (PFC) - provides a flow control mechanism which
38  *   can work independently for each 802.1p priority.
39  *
40  * Congestion Notification - provides a mechanism for end-to-end congestion
41  *   control for protocols which do not have built-in congestion management.
42  *
43  * More information about the emerging standards for these Ethernet features
44  * can be found at: http://www.ieee802.org/1/pages/dcbridges.html
45  *
46  * This file implements an rtnetlink interface to allow configuration of DCB
47  * features for capable devices.
48  */
49
50 MODULE_AUTHOR("Lucy Liu, <lucy.liu@intel.com>");
51 MODULE_DESCRIPTION("Data Center Bridging netlink interface");
52 MODULE_LICENSE("GPL");
53
54 /**************** DCB attribute policies *************************************/
55
56 /* DCB netlink attributes policy */
57 static struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {
58         [DCB_ATTR_IFNAME]      = {.type = NLA_NUL_STRING, .len = IFNAMSIZ - 1},
59         [DCB_ATTR_STATE]       = {.type = NLA_U8},
60         [DCB_ATTR_PFC_CFG]     = {.type = NLA_NESTED},
61         [DCB_ATTR_PG_CFG]      = {.type = NLA_NESTED},
62         [DCB_ATTR_SET_ALL]     = {.type = NLA_U8},
63         [DCB_ATTR_PERM_HWADDR] = {.type = NLA_FLAG},
64         [DCB_ATTR_CAP]         = {.type = NLA_NESTED},
65         [DCB_ATTR_PFC_STATE]   = {.type = NLA_U8},
66         [DCB_ATTR_BCN]         = {.type = NLA_NESTED},
67 };
68
69 /* DCB priority flow control to User Priority nested attributes */
70 static struct nla_policy dcbnl_pfc_up_nest[DCB_PFC_UP_ATTR_MAX + 1] = {
71         [DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},
72         [DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},
73         [DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},
74         [DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},
75         [DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},
76         [DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},
77         [DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},
78         [DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},
79         [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},
80 };
81
82 /* DCB priority grouping nested attributes */
83 static struct nla_policy dcbnl_pg_nest[DCB_PG_ATTR_MAX + 1] = {
84         [DCB_PG_ATTR_TC_0]      = {.type = NLA_NESTED},
85         [DCB_PG_ATTR_TC_1]      = {.type = NLA_NESTED},
86         [DCB_PG_ATTR_TC_2]      = {.type = NLA_NESTED},
87         [DCB_PG_ATTR_TC_3]      = {.type = NLA_NESTED},
88         [DCB_PG_ATTR_TC_4]      = {.type = NLA_NESTED},
89         [DCB_PG_ATTR_TC_5]      = {.type = NLA_NESTED},
90         [DCB_PG_ATTR_TC_6]      = {.type = NLA_NESTED},
91         [DCB_PG_ATTR_TC_7]      = {.type = NLA_NESTED},
92         [DCB_PG_ATTR_TC_ALL]    = {.type = NLA_NESTED},
93         [DCB_PG_ATTR_BW_ID_0]   = {.type = NLA_U8},
94         [DCB_PG_ATTR_BW_ID_1]   = {.type = NLA_U8},
95         [DCB_PG_ATTR_BW_ID_2]   = {.type = NLA_U8},
96         [DCB_PG_ATTR_BW_ID_3]   = {.type = NLA_U8},
97         [DCB_PG_ATTR_BW_ID_4]   = {.type = NLA_U8},
98         [DCB_PG_ATTR_BW_ID_5]   = {.type = NLA_U8},
99         [DCB_PG_ATTR_BW_ID_6]   = {.type = NLA_U8},
100         [DCB_PG_ATTR_BW_ID_7]   = {.type = NLA_U8},
101         [DCB_PG_ATTR_BW_ID_ALL] = {.type = NLA_FLAG},
102 };
103
104 /* DCB traffic class nested attributes. */
105 static struct nla_policy dcbnl_tc_param_nest[DCB_TC_ATTR_PARAM_MAX + 1] = {
106         [DCB_TC_ATTR_PARAM_PGID]            = {.type = NLA_U8},
107         [DCB_TC_ATTR_PARAM_UP_MAPPING]      = {.type = NLA_U8},
108         [DCB_TC_ATTR_PARAM_STRICT_PRIO]     = {.type = NLA_U8},
109         [DCB_TC_ATTR_PARAM_BW_PCT]          = {.type = NLA_U8},
110         [DCB_TC_ATTR_PARAM_ALL]             = {.type = NLA_FLAG},
111 };
112
113 /* DCB capabilities nested attributes. */
114 static struct nla_policy dcbnl_cap_nest[DCB_CAP_ATTR_MAX + 1] = {
115         [DCB_CAP_ATTR_ALL]     = {.type = NLA_FLAG},
116         [DCB_CAP_ATTR_PG]      = {.type = NLA_U8},
117         [DCB_CAP_ATTR_PFC]     = {.type = NLA_U8},
118         [DCB_CAP_ATTR_UP2TC]   = {.type = NLA_U8},
119         [DCB_CAP_ATTR_PG_TCS]  = {.type = NLA_U8},
120         [DCB_CAP_ATTR_PFC_TCS] = {.type = NLA_U8},
121         [DCB_CAP_ATTR_GSP]     = {.type = NLA_U8},
122         [DCB_CAP_ATTR_BCN]     = {.type = NLA_U8},
123 };
124
125 /* DCB capabilities nested attributes. */
126 static struct nla_policy dcbnl_numtcs_nest[DCB_NUMTCS_ATTR_MAX + 1] = {
127         [DCB_NUMTCS_ATTR_ALL]     = {.type = NLA_FLAG},
128         [DCB_NUMTCS_ATTR_PG]      = {.type = NLA_U8},
129         [DCB_NUMTCS_ATTR_PFC]     = {.type = NLA_U8},
130 };
131
132 /* DCB BCN nested attributes. */
133 static struct nla_policy dcbnl_bcn_nest[DCB_BCN_ATTR_MAX + 1] = {
134         [DCB_BCN_ATTR_RP_0]         = {.type = NLA_U8},
135         [DCB_BCN_ATTR_RP_1]         = {.type = NLA_U8},
136         [DCB_BCN_ATTR_RP_2]         = {.type = NLA_U8},
137         [DCB_BCN_ATTR_RP_3]         = {.type = NLA_U8},
138         [DCB_BCN_ATTR_RP_4]         = {.type = NLA_U8},
139         [DCB_BCN_ATTR_RP_5]         = {.type = NLA_U8},
140         [DCB_BCN_ATTR_RP_6]         = {.type = NLA_U8},
141         [DCB_BCN_ATTR_RP_7]         = {.type = NLA_U8},
142         [DCB_BCN_ATTR_RP_ALL]       = {.type = NLA_FLAG},
143         [DCB_BCN_ATTR_BCNA_0]       = {.type = NLA_U32},
144         [DCB_BCN_ATTR_BCNA_1]       = {.type = NLA_U32},
145         [DCB_BCN_ATTR_ALPHA]        = {.type = NLA_U32},
146         [DCB_BCN_ATTR_BETA]         = {.type = NLA_U32},
147         [DCB_BCN_ATTR_GD]           = {.type = NLA_U32},
148         [DCB_BCN_ATTR_GI]           = {.type = NLA_U32},
149         [DCB_BCN_ATTR_TMAX]         = {.type = NLA_U32},
150         [DCB_BCN_ATTR_TD]           = {.type = NLA_U32},
151         [DCB_BCN_ATTR_RMIN]         = {.type = NLA_U32},
152         [DCB_BCN_ATTR_W]            = {.type = NLA_U32},
153         [DCB_BCN_ATTR_RD]           = {.type = NLA_U32},
154         [DCB_BCN_ATTR_RU]           = {.type = NLA_U32},
155         [DCB_BCN_ATTR_WRTT]         = {.type = NLA_U32},
156         [DCB_BCN_ATTR_RI]           = {.type = NLA_U32},
157         [DCB_BCN_ATTR_C]            = {.type = NLA_U32},
158         [DCB_BCN_ATTR_ALL]          = {.type = NLA_FLAG},
159 };
160
161 /* standard netlink reply call */
162 static int dcbnl_reply(u8 value, u8 event, u8 cmd, u8 attr, u32 pid,
163                        u32 seq, u16 flags)
164 {
165         struct sk_buff *dcbnl_skb;
166         struct dcbmsg *dcb;
167         struct nlmsghdr *nlh;
168         int ret = -EINVAL;
169
170         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
171         if (!dcbnl_skb)
172                 return ret;
173
174         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, event, sizeof(*dcb), flags);
175
176         dcb = NLMSG_DATA(nlh);
177         dcb->dcb_family = AF_UNSPEC;
178         dcb->cmd = cmd;
179         dcb->dcb_pad = 0;
180
181         ret = nla_put_u8(dcbnl_skb, attr, value);
182         if (ret)
183                 goto err;
184
185         /* end the message, assign the nlmsg_len. */
186         nlmsg_end(dcbnl_skb, nlh);
187         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
188         if (ret)
189                 goto err;
190
191         return 0;
192 nlmsg_failure:
193 err:
194         kfree_skb(dcbnl_skb);
195         return ret;
196 }
197
198 static int dcbnl_getstate(struct net_device *netdev, struct nlattr **tb,
199                           u32 pid, u32 seq, u16 flags)
200 {
201         int ret = -EINVAL;
202
203         /* if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->getstate) */
204         if (!netdev->dcbnl_ops->getstate)
205                 return ret;
206
207         ret = dcbnl_reply(netdev->dcbnl_ops->getstate(netdev), RTM_GETDCB,
208                           DCB_CMD_GSTATE, DCB_ATTR_STATE, pid, seq, flags);
209
210         return ret;
211 }
212
213 static int dcbnl_getpfccfg(struct net_device *netdev, struct nlattr **tb,
214                            u32 pid, u32 seq, u16 flags)
215 {
216         struct sk_buff *dcbnl_skb;
217         struct nlmsghdr *nlh;
218         struct dcbmsg *dcb;
219         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1], *nest;
220         u8 value;
221         int ret = -EINVAL;
222         int i;
223         int getall = 0;
224
225         if (!tb[DCB_ATTR_PFC_CFG] || !netdev->dcbnl_ops->getpfccfg)
226                 return ret;
227
228         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
229                                tb[DCB_ATTR_PFC_CFG],
230                                dcbnl_pfc_up_nest);
231         if (ret)
232                 goto err_out;
233
234         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
235         if (!dcbnl_skb)
236                 goto err_out;
237
238         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
239
240         dcb = NLMSG_DATA(nlh);
241         dcb->dcb_family = AF_UNSPEC;
242         dcb->cmd = DCB_CMD_PFC_GCFG;
243
244         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_PFC_CFG);
245         if (!nest)
246                 goto err;
247
248         if (data[DCB_PFC_UP_ATTR_ALL])
249                 getall = 1;
250
251         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
252                 if (!getall && !data[i])
253                         continue;
254
255                 netdev->dcbnl_ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0,
256                                              &value);
257                 ret = nla_put_u8(dcbnl_skb, i, value);
258
259                 if (ret) {
260                         nla_nest_cancel(dcbnl_skb, nest);
261                         goto err;
262                 }
263         }
264         nla_nest_end(dcbnl_skb, nest);
265
266         nlmsg_end(dcbnl_skb, nlh);
267
268         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
269         if (ret)
270                 goto err;
271
272         return 0;
273 nlmsg_failure:
274 err:
275         kfree_skb(dcbnl_skb);
276 err_out:
277         return -EINVAL;
278 }
279
280 static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlattr **tb,
281                                 u32 pid, u32 seq, u16 flags)
282 {
283         struct sk_buff *dcbnl_skb;
284         struct nlmsghdr *nlh;
285         struct dcbmsg *dcb;
286         u8 perm_addr[MAX_ADDR_LEN];
287         int ret = -EINVAL;
288
289         if (!netdev->dcbnl_ops->getpermhwaddr)
290                 return ret;
291
292         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
293         if (!dcbnl_skb)
294                 goto err_out;
295
296         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
297
298         dcb = NLMSG_DATA(nlh);
299         dcb->dcb_family = AF_UNSPEC;
300         dcb->cmd = DCB_CMD_GPERM_HWADDR;
301
302         netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);
303
304         ret = nla_put(dcbnl_skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr),
305                       perm_addr);
306
307         nlmsg_end(dcbnl_skb, nlh);
308
309         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
310         if (ret)
311                 goto err;
312
313         return 0;
314
315 nlmsg_failure:
316 err:
317         kfree_skb(dcbnl_skb);
318 err_out:
319         return -EINVAL;
320 }
321
322 static int dcbnl_getcap(struct net_device *netdev, struct nlattr **tb,
323                         u32 pid, u32 seq, u16 flags)
324 {
325         struct sk_buff *dcbnl_skb;
326         struct nlmsghdr *nlh;
327         struct dcbmsg *dcb;
328         struct nlattr *data[DCB_CAP_ATTR_MAX + 1], *nest;
329         u8 value;
330         int ret = -EINVAL;
331         int i;
332         int getall = 0;
333
334         if (!tb[DCB_ATTR_CAP] || !netdev->dcbnl_ops->getcap)
335                 return ret;
336
337         ret = nla_parse_nested(data, DCB_CAP_ATTR_MAX, tb[DCB_ATTR_CAP],
338                                dcbnl_cap_nest);
339         if (ret)
340                 goto err_out;
341
342         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
343         if (!dcbnl_skb)
344                 goto err_out;
345
346         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
347
348         dcb = NLMSG_DATA(nlh);
349         dcb->dcb_family = AF_UNSPEC;
350         dcb->cmd = DCB_CMD_GCAP;
351
352         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_CAP);
353         if (!nest)
354                 goto err;
355
356         if (data[DCB_CAP_ATTR_ALL])
357                 getall = 1;
358
359         for (i = DCB_CAP_ATTR_ALL+1; i <= DCB_CAP_ATTR_MAX; i++) {
360                 if (!getall && !data[i])
361                         continue;
362
363                 if (!netdev->dcbnl_ops->getcap(netdev, i, &value)) {
364                         ret = nla_put_u8(dcbnl_skb, i, value);
365
366                         if (ret) {
367                                 nla_nest_cancel(dcbnl_skb, nest);
368                                 goto err;
369                         }
370                 }
371         }
372         nla_nest_end(dcbnl_skb, nest);
373
374         nlmsg_end(dcbnl_skb, nlh);
375
376         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
377         if (ret)
378                 goto err;
379
380         return 0;
381 nlmsg_failure:
382 err:
383         kfree_skb(dcbnl_skb);
384 err_out:
385         return -EINVAL;
386 }
387
388 static int dcbnl_getnumtcs(struct net_device *netdev, struct nlattr **tb,
389                            u32 pid, u32 seq, u16 flags)
390 {
391         struct sk_buff *dcbnl_skb;
392         struct nlmsghdr *nlh;
393         struct dcbmsg *dcb;
394         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1], *nest;
395         u8 value;
396         int ret = -EINVAL;
397         int i;
398         int getall = 0;
399
400         if (!tb[DCB_ATTR_NUMTCS] || !netdev->dcbnl_ops->getnumtcs)
401                 return ret;
402
403         ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
404                                dcbnl_numtcs_nest);
405         if (ret) {
406                 ret = -EINVAL;
407                 goto err_out;
408         }
409
410         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
411         if (!dcbnl_skb) {
412                 ret = -EINVAL;
413                 goto err_out;
414         }
415
416         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
417
418         dcb = NLMSG_DATA(nlh);
419         dcb->dcb_family = AF_UNSPEC;
420         dcb->cmd = DCB_CMD_GNUMTCS;
421
422         nest = nla_nest_start(dcbnl_skb, DCB_ATTR_NUMTCS);
423         if (!nest) {
424                 ret = -EINVAL;
425                 goto err;
426         }
427
428         if (data[DCB_NUMTCS_ATTR_ALL])
429                 getall = 1;
430
431         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
432                 if (!getall && !data[i])
433                         continue;
434
435                 ret = netdev->dcbnl_ops->getnumtcs(netdev, i, &value);
436                 if (!ret) {
437                         ret = nla_put_u8(dcbnl_skb, i, value);
438
439                         if (ret) {
440                                 nla_nest_cancel(dcbnl_skb, nest);
441                                 ret = -EINVAL;
442                                 goto err;
443                         }
444                 } else {
445                         goto err;
446                 }
447         }
448         nla_nest_end(dcbnl_skb, nest);
449
450         nlmsg_end(dcbnl_skb, nlh);
451
452         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
453         if (ret) {
454                 ret = -EINVAL;
455                 goto err;
456         }
457
458         return 0;
459 nlmsg_failure:
460 err:
461         kfree_skb(dcbnl_skb);
462 err_out:
463         return ret;
464 }
465
466 static int dcbnl_setnumtcs(struct net_device *netdev, struct nlattr **tb,
467                            u32 pid, u32 seq, u16 flags)
468 {
469         struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1];
470         int ret = -EINVAL;
471         u8 value;
472         int i;
473
474         if (!tb[DCB_ATTR_NUMTCS] || !netdev->dcbnl_ops->setnumtcs)
475                 return ret;
476
477         ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
478                                dcbnl_numtcs_nest);
479
480         if (ret) {
481                 ret = -EINVAL;
482                 goto err;
483         }
484
485         for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
486                 if (data[i] == NULL)
487                         continue;
488
489                 value = nla_get_u8(data[i]);
490
491                 ret = netdev->dcbnl_ops->setnumtcs(netdev, i, value);
492
493                 if (ret)
494                         goto operr;
495         }
496
497 operr:
498         ret = dcbnl_reply(!!ret, RTM_SETDCB, DCB_CMD_SNUMTCS,
499                           DCB_ATTR_NUMTCS, pid, seq, flags);
500
501 err:
502         return ret;
503 }
504
505 static int dcbnl_getpfcstate(struct net_device *netdev, struct nlattr **tb,
506                              u32 pid, u32 seq, u16 flags)
507 {
508         int ret = -EINVAL;
509
510         if (!netdev->dcbnl_ops->getpfcstate)
511                 return ret;
512
513         ret = dcbnl_reply(netdev->dcbnl_ops->getpfcstate(netdev), RTM_GETDCB,
514                           DCB_CMD_PFC_GSTATE, DCB_ATTR_PFC_STATE,
515                           pid, seq, flags);
516
517         return ret;
518 }
519
520 static int dcbnl_setpfcstate(struct net_device *netdev, struct nlattr **tb,
521                              u32 pid, u32 seq, u16 flags)
522 {
523         int ret = -EINVAL;
524         u8 value;
525
526         if (!tb[DCB_ATTR_PFC_STATE] || !netdev->dcbnl_ops->setpfcstate)
527                 return ret;
528
529         value = nla_get_u8(tb[DCB_ATTR_PFC_STATE]);
530
531         netdev->dcbnl_ops->setpfcstate(netdev, value);
532
533         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SSTATE, DCB_ATTR_PFC_STATE,
534                           pid, seq, flags);
535
536         return ret;
537 }
538
539 static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlattr **tb,
540                              u32 pid, u32 seq, u16 flags, int dir)
541 {
542         struct sk_buff *dcbnl_skb;
543         struct nlmsghdr *nlh;
544         struct dcbmsg *dcb;
545         struct nlattr *pg_nest, *param_nest, *data;
546         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
547         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
548         u8 prio, pgid, tc_pct, up_map;
549         int ret  = -EINVAL;
550         int getall = 0;
551         int i;
552
553         if (!tb[DCB_ATTR_PG_CFG] ||
554             !netdev->dcbnl_ops->getpgtccfgtx ||
555             !netdev->dcbnl_ops->getpgtccfgrx ||
556             !netdev->dcbnl_ops->getpgbwgcfgtx ||
557             !netdev->dcbnl_ops->getpgbwgcfgrx)
558                 return ret;
559
560         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
561                                tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
562
563         if (ret)
564                 goto err_out;
565
566         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
567         if (!dcbnl_skb)
568                 goto err_out;
569
570         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
571
572         dcb = NLMSG_DATA(nlh);
573         dcb->dcb_family = AF_UNSPEC;
574         dcb->cmd = (dir) ? DCB_CMD_PGRX_GCFG : DCB_CMD_PGTX_GCFG;
575
576         pg_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_PG_CFG);
577         if (!pg_nest)
578                 goto err;
579
580         if (pg_tb[DCB_PG_ATTR_TC_ALL])
581                 getall = 1;
582
583         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
584                 if (!getall && !pg_tb[i])
585                         continue;
586
587                 if (pg_tb[DCB_PG_ATTR_TC_ALL])
588                         data = pg_tb[DCB_PG_ATTR_TC_ALL];
589                 else
590                         data = pg_tb[i];
591                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
592                                        data, dcbnl_tc_param_nest);
593                 if (ret)
594                         goto err_pg;
595
596                 param_nest = nla_nest_start(dcbnl_skb, i);
597                 if (!param_nest)
598                         goto err_pg;
599
600                 pgid = DCB_ATTR_VALUE_UNDEFINED;
601                 prio = DCB_ATTR_VALUE_UNDEFINED;
602                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
603                 up_map = DCB_ATTR_VALUE_UNDEFINED;
604
605                 if (dir) {
606                         /* Rx */
607                         netdev->dcbnl_ops->getpgtccfgrx(netdev,
608                                                 i - DCB_PG_ATTR_TC_0, &prio,
609                                                 &pgid, &tc_pct, &up_map);
610                 } else {
611                         /* Tx */
612                         netdev->dcbnl_ops->getpgtccfgtx(netdev,
613                                                 i - DCB_PG_ATTR_TC_0, &prio,
614                                                 &pgid, &tc_pct, &up_map);
615                 }
616
617                 if (param_tb[DCB_TC_ATTR_PARAM_PGID] ||
618                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
619                         ret = nla_put_u8(dcbnl_skb,
620                                          DCB_TC_ATTR_PARAM_PGID, pgid);
621                         if (ret)
622                                 goto err_param;
623                 }
624                 if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING] ||
625                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
626                         ret = nla_put_u8(dcbnl_skb,
627                                          DCB_TC_ATTR_PARAM_UP_MAPPING, up_map);
628                         if (ret)
629                                 goto err_param;
630                 }
631                 if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO] ||
632                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
633                         ret = nla_put_u8(dcbnl_skb,
634                                          DCB_TC_ATTR_PARAM_STRICT_PRIO, prio);
635                         if (ret)
636                                 goto err_param;
637                 }
638                 if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT] ||
639                     param_tb[DCB_TC_ATTR_PARAM_ALL]) {
640                         ret = nla_put_u8(dcbnl_skb, DCB_TC_ATTR_PARAM_BW_PCT,
641                                          tc_pct);
642                         if (ret)
643                                 goto err_param;
644                 }
645                 nla_nest_end(dcbnl_skb, param_nest);
646         }
647
648         if (pg_tb[DCB_PG_ATTR_BW_ID_ALL])
649                 getall = 1;
650         else
651                 getall = 0;
652
653         for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
654                 if (!getall && !pg_tb[i])
655                         continue;
656
657                 tc_pct = DCB_ATTR_VALUE_UNDEFINED;
658
659                 if (dir) {
660                         /* Rx */
661                         netdev->dcbnl_ops->getpgbwgcfgrx(netdev,
662                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
663                 } else {
664                         /* Tx */
665                         netdev->dcbnl_ops->getpgbwgcfgtx(netdev,
666                                         i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
667                 }
668                 ret = nla_put_u8(dcbnl_skb, i, tc_pct);
669
670                 if (ret)
671                         goto err_pg;
672         }
673
674         nla_nest_end(dcbnl_skb, pg_nest);
675
676         nlmsg_end(dcbnl_skb, nlh);
677
678         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
679         if (ret)
680                 goto err;
681
682         return 0;
683
684 err_param:
685         nla_nest_cancel(dcbnl_skb, param_nest);
686 err_pg:
687         nla_nest_cancel(dcbnl_skb, pg_nest);
688 nlmsg_failure:
689 err:
690         kfree_skb(dcbnl_skb);
691 err_out:
692         ret  = -EINVAL;
693         return ret;
694 }
695
696 static int dcbnl_pgtx_getcfg(struct net_device *netdev, struct nlattr **tb,
697                              u32 pid, u32 seq, u16 flags)
698 {
699         return __dcbnl_pg_getcfg(netdev, tb, pid, seq, flags, 0);
700 }
701
702 static int dcbnl_pgrx_getcfg(struct net_device *netdev, struct nlattr **tb,
703                              u32 pid, u32 seq, u16 flags)
704 {
705         return __dcbnl_pg_getcfg(netdev, tb, pid, seq, flags, 1);
706 }
707
708 static int dcbnl_setstate(struct net_device *netdev, struct nlattr **tb,
709                           u32 pid, u32 seq, u16 flags)
710 {
711         int ret = -EINVAL;
712         u8 value;
713
714         if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->setstate)
715                 return ret;
716
717         value = nla_get_u8(tb[DCB_ATTR_STATE]);
718
719         ret = dcbnl_reply(netdev->dcbnl_ops->setstate(netdev, value),
720                           RTM_SETDCB, DCB_CMD_SSTATE, DCB_ATTR_STATE,
721                           pid, seq, flags);
722
723         return ret;
724 }
725
726 static int dcbnl_setpfccfg(struct net_device *netdev, struct nlattr **tb,
727                            u32 pid, u32 seq, u16 flags)
728 {
729         struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1];
730         int i;
731         int ret = -EINVAL;
732         u8 value;
733
734         if (!tb[DCB_ATTR_PFC_CFG] || !netdev->dcbnl_ops->setpfccfg)
735                 return ret;
736
737         ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
738                                tb[DCB_ATTR_PFC_CFG],
739                                dcbnl_pfc_up_nest);
740         if (ret)
741                 goto err;
742
743         for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
744                 if (data[i] == NULL)
745                         continue;
746                 value = nla_get_u8(data[i]);
747                 netdev->dcbnl_ops->setpfccfg(netdev,
748                         data[i]->nla_type - DCB_PFC_UP_ATTR_0, value);
749         }
750
751         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SCFG, DCB_ATTR_PFC_CFG,
752                           pid, seq, flags);
753 err:
754         return ret;
755 }
756
757 static int dcbnl_setall(struct net_device *netdev, struct nlattr **tb,
758                         u32 pid, u32 seq, u16 flags)
759 {
760         int ret = -EINVAL;
761
762         if (!tb[DCB_ATTR_SET_ALL] || !netdev->dcbnl_ops->setall)
763                 return ret;
764
765         ret = dcbnl_reply(netdev->dcbnl_ops->setall(netdev), RTM_SETDCB,
766                           DCB_CMD_SET_ALL, DCB_ATTR_SET_ALL, pid, seq, flags);
767
768         return ret;
769 }
770
771 static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlattr **tb,
772                              u32 pid, u32 seq, u16 flags, int dir)
773 {
774         struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
775         struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
776         int ret = -EINVAL;
777         int i;
778         u8 pgid;
779         u8 up_map;
780         u8 prio;
781         u8 tc_pct;
782
783         if (!tb[DCB_ATTR_PG_CFG] ||
784             !netdev->dcbnl_ops->setpgtccfgtx ||
785             !netdev->dcbnl_ops->setpgtccfgrx ||
786             !netdev->dcbnl_ops->setpgbwgcfgtx ||
787             !netdev->dcbnl_ops->setpgbwgcfgrx)
788                 return ret;
789
790         ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
791                                tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
792         if (ret)
793                 goto err;
794
795         for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
796                 if (!pg_tb[i])
797                         continue;
798
799                 ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
800                                        pg_tb[i], dcbnl_tc_param_nest);
801                 if (ret)
802                         goto err;
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         ret = dcbnl_reply(0, RTM_SETDCB,
856                           (dir ? DCB_CMD_PGRX_SCFG : DCB_CMD_PGTX_SCFG),
857                           DCB_ATTR_PG_CFG, pid, seq, flags);
858
859 err:
860         return ret;
861 }
862
863 static int dcbnl_pgtx_setcfg(struct net_device *netdev, struct nlattr **tb,
864                              u32 pid, u32 seq, u16 flags)
865 {
866         return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 0);
867 }
868
869 static int dcbnl_pgrx_setcfg(struct net_device *netdev, struct nlattr **tb,
870                              u32 pid, u32 seq, u16 flags)
871 {
872         return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 1);
873 }
874
875 static int dcbnl_bcn_getcfg(struct net_device *netdev, struct nlattr **tb,
876                             u32 pid, u32 seq, u16 flags)
877 {
878         struct sk_buff *dcbnl_skb;
879         struct nlmsghdr *nlh;
880         struct dcbmsg *dcb;
881         struct nlattr *bcn_nest;
882         struct nlattr *bcn_tb[DCB_BCN_ATTR_MAX + 1];
883         u8 value_byte;
884         u32 value_integer;
885         int ret  = -EINVAL;
886         bool getall = false;
887         int i;
888
889         if (!tb[DCB_ATTR_BCN] || !netdev->dcbnl_ops->getbcnrp ||
890             !netdev->dcbnl_ops->getbcncfg)
891                 return ret;
892
893         ret = nla_parse_nested(bcn_tb, DCB_BCN_ATTR_MAX,
894                                tb[DCB_ATTR_BCN], dcbnl_bcn_nest);
895
896         if (ret)
897                 goto err_out;
898
899         dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
900         if (!dcbnl_skb)
901                 goto err_out;
902
903         nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
904
905         dcb = NLMSG_DATA(nlh);
906         dcb->dcb_family = AF_UNSPEC;
907         dcb->cmd = DCB_CMD_BCN_GCFG;
908
909         bcn_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_BCN);
910         if (!bcn_nest)
911                 goto err;
912
913         if (bcn_tb[DCB_BCN_ATTR_ALL])
914                 getall = true;
915
916         for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
917                 if (!getall && !bcn_tb[i])
918                         continue;
919
920                 netdev->dcbnl_ops->getbcnrp(netdev, i - DCB_BCN_ATTR_RP_0,
921                                             &value_byte);
922                 ret = nla_put_u8(dcbnl_skb, i, value_byte);
923                 if (ret)
924                         goto err_bcn;
925         }
926
927         for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {
928                 if (!getall && !bcn_tb[i])
929                         continue;
930
931                 netdev->dcbnl_ops->getbcncfg(netdev, i,
932                                              &value_integer);
933                 ret = nla_put_u32(dcbnl_skb, i, value_integer);
934                 if (ret)
935                         goto err_bcn;
936         }
937
938         nla_nest_end(dcbnl_skb, bcn_nest);
939
940         nlmsg_end(dcbnl_skb, nlh);
941
942         ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
943         if (ret)
944                 goto err;
945
946         return 0;
947
948 err_bcn:
949         nla_nest_cancel(dcbnl_skb, bcn_nest);
950 nlmsg_failure:
951 err:
952         kfree_skb(dcbnl_skb);
953 err_out:
954         ret  = -EINVAL;
955         return ret;
956 }
957
958 static int dcbnl_bcn_setcfg(struct net_device *netdev, struct nlattr **tb,
959                             u32 pid, u32 seq, u16 flags)
960 {
961         struct nlattr *data[DCB_BCN_ATTR_MAX + 1];
962         int i;
963         int ret = -EINVAL;
964         u8 value_byte;
965         u32 value_int;
966
967         if (!tb[DCB_ATTR_BCN] || !netdev->dcbnl_ops->setbcncfg
968             || !netdev->dcbnl_ops->setbcnrp)
969                 return ret;
970
971         ret = nla_parse_nested(data, DCB_BCN_ATTR_MAX,
972                                tb[DCB_ATTR_BCN],
973                                dcbnl_pfc_up_nest);
974         if (ret)
975                 goto err;
976
977         for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
978                 if (data[i] == NULL)
979                         continue;
980                 value_byte = nla_get_u8(data[i]);
981                 netdev->dcbnl_ops->setbcnrp(netdev,
982                         data[i]->nla_type - DCB_BCN_ATTR_RP_0, value_byte);
983         }
984
985         for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {
986                 if (data[i] == NULL)
987                         continue;
988                 value_int = nla_get_u32(data[i]);
989                 netdev->dcbnl_ops->setbcncfg(netdev,
990                                              i, value_int);
991         }
992
993         ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_BCN_SCFG, DCB_ATTR_BCN,
994                           pid, seq, flags);
995 err:
996         return ret;
997 }
998
999 static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1000 {
1001         struct net *net = sock_net(skb->sk);
1002         struct net_device *netdev;
1003         struct dcbmsg  *dcb = (struct dcbmsg *)NLMSG_DATA(nlh);
1004         struct nlattr *tb[DCB_ATTR_MAX + 1];
1005         u32 pid = skb ? NETLINK_CB(skb).pid : 0;
1006         int ret = -EINVAL;
1007
1008         if (net != &init_net)
1009                 return -EINVAL;
1010
1011         ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
1012                           dcbnl_rtnl_policy);
1013         if (ret < 0)
1014                 return ret;
1015
1016         if (!tb[DCB_ATTR_IFNAME])
1017                 return -EINVAL;
1018
1019         netdev = dev_get_by_name(&init_net, nla_data(tb[DCB_ATTR_IFNAME]));
1020         if (!netdev)
1021                 return -EINVAL;
1022
1023         if (!netdev->dcbnl_ops)
1024                 goto errout;
1025
1026         switch (dcb->cmd) {
1027         case DCB_CMD_GSTATE:
1028                 ret = dcbnl_getstate(netdev, tb, pid, nlh->nlmsg_seq,
1029                                      nlh->nlmsg_flags);
1030                 goto out;
1031         case DCB_CMD_PFC_GCFG:
1032                 ret = dcbnl_getpfccfg(netdev, tb, pid, nlh->nlmsg_seq,
1033                                       nlh->nlmsg_flags);
1034                 goto out;
1035         case DCB_CMD_GPERM_HWADDR:
1036                 ret = dcbnl_getperm_hwaddr(netdev, tb, pid, nlh->nlmsg_seq,
1037                                            nlh->nlmsg_flags);
1038                 goto out;
1039         case DCB_CMD_PGTX_GCFG:
1040                 ret = dcbnl_pgtx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
1041                                         nlh->nlmsg_flags);
1042                 goto out;
1043         case DCB_CMD_PGRX_GCFG:
1044                 ret = dcbnl_pgrx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
1045                                         nlh->nlmsg_flags);
1046                 goto out;
1047         case DCB_CMD_BCN_GCFG:
1048                 ret = dcbnl_bcn_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
1049                                        nlh->nlmsg_flags);
1050                 goto out;
1051         case DCB_CMD_SSTATE:
1052                 ret = dcbnl_setstate(netdev, tb, pid, nlh->nlmsg_seq,
1053                                      nlh->nlmsg_flags);
1054                 goto out;
1055         case DCB_CMD_PFC_SCFG:
1056                 ret = dcbnl_setpfccfg(netdev, tb, pid, nlh->nlmsg_seq,
1057                                       nlh->nlmsg_flags);
1058                 goto out;
1059
1060         case DCB_CMD_SET_ALL:
1061                 ret = dcbnl_setall(netdev, tb, pid, nlh->nlmsg_seq,
1062                                    nlh->nlmsg_flags);
1063                 goto out;
1064         case DCB_CMD_PGTX_SCFG:
1065                 ret = dcbnl_pgtx_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
1066                                         nlh->nlmsg_flags);
1067                 goto out;
1068         case DCB_CMD_PGRX_SCFG:
1069                 ret = dcbnl_pgrx_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
1070                                         nlh->nlmsg_flags);
1071                 goto out;
1072         case DCB_CMD_GCAP:
1073                 ret = dcbnl_getcap(netdev, tb, pid, nlh->nlmsg_seq,
1074                                    nlh->nlmsg_flags);
1075                 goto out;
1076         case DCB_CMD_GNUMTCS:
1077                 ret = dcbnl_getnumtcs(netdev, tb, pid, nlh->nlmsg_seq,
1078                                       nlh->nlmsg_flags);
1079                 goto out;
1080         case DCB_CMD_SNUMTCS:
1081                 ret = dcbnl_setnumtcs(netdev, tb, pid, nlh->nlmsg_seq,
1082                                       nlh->nlmsg_flags);
1083                 goto out;
1084         case DCB_CMD_PFC_GSTATE:
1085                 ret = dcbnl_getpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
1086                                         nlh->nlmsg_flags);
1087                 goto out;
1088         case DCB_CMD_PFC_SSTATE:
1089                 ret = dcbnl_setpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
1090                                         nlh->nlmsg_flags);
1091                 goto out;
1092         case DCB_CMD_BCN_SCFG:
1093                 ret = dcbnl_bcn_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
1094                                        nlh->nlmsg_flags);
1095                 goto out;
1096         default:
1097                 goto errout;
1098         }
1099 errout:
1100         ret = -EINVAL;
1101 out:
1102         dev_put(netdev);
1103         return ret;
1104 }
1105
1106 static int __init dcbnl_init(void)
1107 {
1108         rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL);
1109         rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL);
1110
1111         return 0;
1112 }
1113 module_init(dcbnl_init);
1114
1115 static void __exit dcbnl_exit(void)
1116 {
1117         rtnl_unregister(PF_UNSPEC, RTM_GETDCB);
1118         rtnl_unregister(PF_UNSPEC, RTM_SETDCB);
1119 }
1120 module_exit(dcbnl_exit);
1121
1122