Root/target/linux/generic-2.6/files/drivers/net/phy/swconfig.c

1/*
2 * swconfig.c: Switch configuration API
3 *
4 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/types.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/list.h>
21#include <linux/if.h>
22#include <linux/if_ether.h>
23#include <linux/capability.h>
24#include <linux/skbuff.h>
25#include <linux/switch.h>
26
27//#define DEBUG 1
28#ifdef DEBUG
29#define DPRINTF(format, ...) printk("%s: " format, __func__, ##__VA_ARGS__)
30#else
31#define DPRINTF(...) do {} while(0)
32#endif
33
34MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
35MODULE_LICENSE("GPL");
36
37static int swdev_id = 0;
38static struct list_head swdevs;
39static spinlock_t swdevs_lock = SPIN_LOCK_UNLOCKED;
40struct swconfig_callback;
41
42struct swconfig_callback
43{
44    struct sk_buff *msg;
45    struct genlmsghdr *hdr;
46    struct genl_info *info;
47    int cmd;
48
49    /* callback for filling in the message data */
50    int (*fill)(struct swconfig_callback *cb, void *arg);
51
52    /* callback for closing the message before sending it */
53    int (*close)(struct swconfig_callback *cb, void *arg);
54
55    struct nlattr *nest[4];
56    int args[4];
57};
58
59/* defaults */
60
61static int
62swconfig_get_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
63{
64    int ret;
65    if (val->port_vlan >= dev->vlans)
66        return -EINVAL;
67
68    if (!dev->get_vlan_ports)
69        return -EOPNOTSUPP;
70
71    ret = dev->get_vlan_ports(dev, val);
72    return ret;
73}
74
75static int
76swconfig_set_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
77{
78    struct switch_port *ports = val->value.ports;
79    int i;
80
81    if (val->port_vlan >= dev->vlans)
82        return -EINVAL;
83
84    /* validate ports */
85    if (val->len > dev->ports)
86        return -EINVAL;
87
88    if (!dev->set_vlan_ports)
89        return -EOPNOTSUPP;
90
91    for (i = 0; i < val->len; i++) {
92        if (ports[i].id >= dev->ports)
93            return -EINVAL;
94
95        if (dev->set_port_pvid && !(ports[i].flags & (1 << SWITCH_PORT_FLAG_TAGGED)))
96            dev->set_port_pvid(dev, ports[i].id, val->port_vlan);
97    }
98
99    return dev->set_vlan_ports(dev, val);
100}
101
102static int
103swconfig_set_pvid(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
104{
105    if (val->port_vlan >= dev->ports)
106        return -EINVAL;
107
108    if (!dev->set_port_pvid)
109        return -EOPNOTSUPP;
110
111    return dev->set_port_pvid(dev, val->port_vlan, val->value.i);
112}
113
114static int
115swconfig_get_pvid(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
116{
117    if (val->port_vlan >= dev->ports)
118        return -EINVAL;
119
120    if (!dev->get_port_pvid)
121        return -EOPNOTSUPP;
122
123    return dev->get_port_pvid(dev, val->port_vlan, &val->value.i);
124}
125
126static int
127swconfig_apply_config(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
128{
129    /* don't complain if not supported by the switch driver */
130    if (!dev->apply_config)
131        return 0;
132
133    return dev->apply_config(dev);
134}
135
136static int
137swconfig_reset_switch(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
138{
139    /* don't complain if not supported by the switch driver */
140    if (!dev->reset_switch)
141        return 0;
142
143    return dev->reset_switch(dev);
144}
145
146enum global_defaults {
147    GLOBAL_APPLY,
148    GLOBAL_RESET,
149};
150
151enum vlan_defaults {
152    VLAN_PORTS,
153};
154
155enum port_defaults {
156    PORT_PVID,
157};
158
159static struct switch_attr default_global[] = {
160    [GLOBAL_APPLY] = {
161        .type = SWITCH_TYPE_NOVAL,
162        .name = "apply",
163        .description = "Activate changes in the hardware",
164        .set = swconfig_apply_config,
165    },
166    [GLOBAL_RESET] = {
167        .type = SWITCH_TYPE_NOVAL,
168        .name = "reset",
169        .description = "Reset the switch",
170        .set = swconfig_reset_switch,
171    }
172};
173
174static struct switch_attr default_port[] = {
175    [PORT_PVID] = {
176        .type = SWITCH_TYPE_INT,
177        .name = "pvid",
178        .description = "Primary VLAN ID",
179        .set = swconfig_set_pvid,
180        .get = swconfig_get_pvid,
181    }
182};
183
184static struct switch_attr default_vlan[] = {
185    [VLAN_PORTS] = {
186        .type = SWITCH_TYPE_PORTS,
187        .name = "ports",
188        .description = "VLAN port mapping",
189        .set = swconfig_set_vlan_ports,
190        .get = swconfig_get_vlan_ports,
191    },
192};
193
194
195static void swconfig_defaults_init(struct switch_dev *dev)
196{
197    dev->def_global = 0;
198    dev->def_vlan = 0;
199    dev->def_port = 0;
200
201    if (dev->get_vlan_ports || dev->set_vlan_ports)
202        set_bit(VLAN_PORTS, &dev->def_vlan);
203
204    if (dev->get_port_pvid || dev->set_port_pvid)
205        set_bit(PORT_PVID, &dev->def_port);
206
207    /* always present, can be no-op */
208    set_bit(GLOBAL_APPLY, &dev->def_global);
209    set_bit(GLOBAL_RESET, &dev->def_global);
210}
211
212
213static struct genl_family switch_fam = {
214    .id = GENL_ID_GENERATE,
215    .name = "switch",
216    .hdrsize = 0,
217    .version = 1,
218    .maxattr = SWITCH_ATTR_MAX,
219};
220
221static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
222    [SWITCH_ATTR_ID] = { .type = NLA_U32 },
223    [SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
224    [SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
225    [SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
226    [SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
227    [SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
228    [SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
229    [SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
230};
231
232static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
233    [SWITCH_PORT_ID] = { .type = NLA_U32 },
234    [SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
235};
236
237static inline void
238swconfig_lock(void)
239{
240    spin_lock(&swdevs_lock);
241}
242
243static inline void
244swconfig_unlock(void)
245{
246    spin_unlock(&swdevs_lock);
247}
248
249static struct switch_dev *
250swconfig_get_dev(struct genl_info *info)
251{
252    struct switch_dev *dev = NULL;
253    struct switch_dev *p;
254    int id;
255
256    if (!info->attrs[SWITCH_ATTR_ID])
257        goto done;
258
259    id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
260    swconfig_lock();
261    list_for_each_entry(p, &swdevs, dev_list) {
262        if (id != p->id)
263            continue;
264
265        dev = p;
266        break;
267    }
268    if (dev)
269        spin_lock(&dev->lock);
270    else
271        DPRINTF("device %d not found\n", id);
272    swconfig_unlock();
273done:
274    return dev;
275}
276
277static inline void
278swconfig_put_dev(struct switch_dev *dev)
279{
280    spin_unlock(&dev->lock);
281}
282
283static int
284swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
285{
286    struct switch_attr *op = arg;
287    struct genl_info *info = cb->info;
288    struct sk_buff *msg = cb->msg;
289    int id = cb->args[0];
290    void *hdr;
291
292    hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, &switch_fam,
293            NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
294    if (IS_ERR(hdr))
295        return -1;
296
297    NLA_PUT_U32(msg, SWITCH_ATTR_OP_ID, id);
298    NLA_PUT_U32(msg, SWITCH_ATTR_OP_TYPE, op->type);
299    NLA_PUT_STRING(msg, SWITCH_ATTR_OP_NAME, op->name);
300    if (op->description)
301        NLA_PUT_STRING(msg, SWITCH_ATTR_OP_DESCRIPTION,
302            op->description);
303
304    return genlmsg_end(msg, hdr);
305nla_put_failure:
306    genlmsg_cancel(msg, hdr);
307    return -EMSGSIZE;
308}
309
310/* spread multipart messages across multiple message buffers */
311static int
312swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
313{
314    struct genl_info *info = cb->info;
315    int restart = 0;
316    int err;
317
318    do {
319        if (!cb->msg) {
320            cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
321            if (cb->msg == NULL)
322                goto error;
323        }
324
325        if (!(cb->fill(cb, arg) < 0))
326            break;
327
328        /* fill failed, check if this was already the second attempt */
329        if (restart)
330            goto error;
331
332        /* try again in a new message, send the current one */
333        restart = 1;
334        if (cb->close) {
335            if (cb->close(cb, arg) < 0)
336                goto error;
337        }
338        err = genlmsg_unicast(cb->msg, info->snd_pid);
339        cb->msg = NULL;
340        if (err < 0)
341            goto error;
342
343    } while (restart);
344
345    return 0;
346
347error:
348    if (cb->msg)
349        nlmsg_free(cb->msg);
350    return -1;
351}
352
353static int
354swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
355{
356    struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
357    const struct switch_attrlist *alist;
358    struct switch_dev *dev;
359    struct swconfig_callback cb;
360    int err = -EINVAL;
361    int i;
362
363    /* defaults */
364    struct switch_attr *def_list;
365    unsigned long *def_active;
366    int n_def;
367
368    dev = swconfig_get_dev(info);
369    if (!dev)
370        return -EINVAL;
371
372    switch(hdr->cmd) {
373    case SWITCH_CMD_LIST_GLOBAL:
374        alist = &dev->attr_global;
375        def_list = default_global;
376        def_active = &dev->def_global;
377        n_def = ARRAY_SIZE(default_global);
378        break;
379    case SWITCH_CMD_LIST_VLAN:
380        alist = &dev->attr_vlan;
381        def_list = default_vlan;
382        def_active = &dev->def_vlan;
383        n_def = ARRAY_SIZE(default_vlan);
384        break;
385    case SWITCH_CMD_LIST_PORT:
386        alist = &dev->attr_port;
387        def_list = default_port;
388        def_active = &dev->def_port;
389        n_def = ARRAY_SIZE(default_port);
390        break;
391    default:
392        WARN_ON(1);
393        goto out;
394    }
395
396    memset(&cb, 0, sizeof(cb));
397    cb.info = info;
398    cb.fill = swconfig_dump_attr;
399    for (i = 0; i < alist->n_attr; i++) {
400        if (alist->attr[i].disabled)
401            continue;
402        cb.args[0] = i;
403        err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
404        if (err < 0)
405            goto error;
406    }
407
408    /* defaults */
409    for (i = 0; i < n_def; i++) {
410        if (!test_bit(i, def_active))
411            continue;
412        cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
413        err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
414        if (err < 0)
415            goto error;
416    }
417    swconfig_put_dev(dev);
418
419    if (!cb.msg)
420        return 0;
421
422    return genlmsg_unicast(cb.msg, info->snd_pid);
423
424error:
425    if (cb.msg)
426        nlmsg_free(cb.msg);
427out:
428    swconfig_put_dev(dev);
429    return err;
430}
431
432static const struct switch_attr *
433swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
434        struct switch_val *val)
435{
436    struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
437    const struct switch_attrlist *alist;
438    const struct switch_attr *attr = NULL;
439    int attr_id;
440
441    /* defaults */
442    struct switch_attr *def_list;
443    unsigned long *def_active;
444    int n_def;
445
446    if (!info->attrs[SWITCH_ATTR_OP_ID])
447        goto done;
448
449    switch(hdr->cmd) {
450    case SWITCH_CMD_SET_GLOBAL:
451    case SWITCH_CMD_GET_GLOBAL:
452        alist = &dev->attr_global;
453        def_list = default_global;
454        def_active = &dev->def_global;
455        n_def = ARRAY_SIZE(default_global);
456        break;
457    case SWITCH_CMD_SET_VLAN:
458    case SWITCH_CMD_GET_VLAN:
459        alist = &dev->attr_vlan;
460        def_list = default_vlan;
461        def_active = &dev->def_vlan;
462        n_def = ARRAY_SIZE(default_vlan);
463        if (!info->attrs[SWITCH_ATTR_OP_VLAN])
464            goto done;
465        val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
466        if (val->port_vlan >= dev->vlans)
467            goto done;
468        break;
469    case SWITCH_CMD_SET_PORT:
470    case SWITCH_CMD_GET_PORT:
471        alist = &dev->attr_port;
472        def_list = default_port;
473        def_active = &dev->def_port;
474        n_def = ARRAY_SIZE(default_port);
475        if (!info->attrs[SWITCH_ATTR_OP_PORT])
476            goto done;
477        val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
478        if (val->port_vlan >= dev->ports)
479            goto done;
480        break;
481    default:
482        WARN_ON(1);
483        goto done;
484    }
485
486    if (!alist)
487        goto done;
488
489    attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
490    if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
491        attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
492        if (attr_id >= n_def)
493            goto done;
494        if (!test_bit(attr_id, def_active))
495            goto done;
496        attr = &def_list[attr_id];
497    } else {
498        if (attr_id >= alist->n_attr)
499            goto done;
500        attr = &alist->attr[attr_id];
501    }
502
503    if (attr->disabled)
504        attr = NULL;
505
506done:
507    if (!attr)
508        DPRINTF("attribute lookup failed\n");
509    val->attr = attr;
510    return attr;
511}
512
513static int
514swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
515        struct switch_val *val, int max)
516{
517    struct nlattr *nla;
518    int rem;
519
520    val->len = 0;
521    nla_for_each_nested(nla, head, rem) {
522        struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
523        struct switch_port *port = &val->value.ports[val->len];
524
525        if (val->len >= max)
526            return -EINVAL;
527
528        if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
529                port_policy))
530            return -EINVAL;
531
532        if (!tb[SWITCH_PORT_ID])
533            return -EINVAL;
534
535        port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
536        if (tb[SWITCH_PORT_FLAG_TAGGED])
537            port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
538        val->len++;
539    }
540
541    return 0;
542}
543
544static int
545swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
546{
547    const struct switch_attr *attr;
548    struct switch_dev *dev;
549    struct switch_val val;
550    int err = -EINVAL;
551
552    dev = swconfig_get_dev(info);
553    if (!dev)
554        return -EINVAL;
555
556    memset(&val, 0, sizeof(val));
557    attr = swconfig_lookup_attr(dev, info, &val);
558    if (!attr || !attr->set)
559        goto error;
560
561    val.attr = attr;
562    switch(attr->type) {
563    case SWITCH_TYPE_NOVAL:
564        break;
565    case SWITCH_TYPE_INT:
566        if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
567            goto error;
568        val.value.i =
569            nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
570        break;
571    case SWITCH_TYPE_STRING:
572        if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
573            goto error;
574        val.value.s =
575            nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
576        break;
577    case SWITCH_TYPE_PORTS:
578        val.value.ports = dev->portbuf;
579        memset(dev->portbuf, 0,
580            sizeof(struct switch_port) * dev->ports);
581
582        /* TODO: implement multipart? */
583        if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
584            err = swconfig_parse_ports(skb,
585                info->attrs[SWITCH_ATTR_OP_VALUE_PORTS], &val, dev->ports);
586            if (err < 0)
587                goto error;
588        } else {
589            val.len = 0;
590            err = 0;
591        }
592        break;
593    default:
594        goto error;
595    }
596
597    err = attr->set(dev, attr, &val);
598error:
599    swconfig_put_dev(dev);
600    return err;
601}
602
603static int
604swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
605{
606    if (cb->nest[0])
607        nla_nest_end(cb->msg, cb->nest[0]);
608    return 0;
609}
610
611static int
612swconfig_send_port(struct swconfig_callback *cb, void *arg)
613{
614    const struct switch_port *port = arg;
615    struct nlattr *p = NULL;
616
617    if (!cb->nest[0]) {
618        cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
619        if (!cb->nest[0])
620            return -1;
621    }
622
623    p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
624    if (!p)
625        goto error;
626
627    NLA_PUT_U32(cb->msg, SWITCH_PORT_ID, port->id);
628    if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED))
629        NLA_PUT_FLAG(cb->msg, SWITCH_PORT_FLAG_TAGGED);
630
631    nla_nest_end(cb->msg, p);
632    return 0;
633
634nla_put_failure:
635        nla_nest_cancel(cb->msg, p);
636error:
637    nla_nest_cancel(cb->msg, cb->nest[0]);
638    return -1;
639}
640
641static int
642swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
643        const struct switch_val *val)
644{
645    struct swconfig_callback cb;
646    int err = 0;
647    int i;
648
649    if (!val->value.ports)
650        return -EINVAL;
651
652    memset(&cb, 0, sizeof(cb));
653    cb.cmd = attr;
654    cb.msg = *msg;
655    cb.info = info;
656    cb.fill = swconfig_send_port;
657    cb.close = swconfig_close_portlist;
658
659    cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
660    for (i = 0; i < val->len; i++) {
661        err = swconfig_send_multipart(&cb, &val->value.ports[i]);
662        if (err)
663            goto done;
664    }
665    err = val->len;
666    swconfig_close_portlist(&cb, NULL);
667    *msg = cb.msg;
668
669done:
670    return err;
671}
672
673static int
674swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
675{
676    struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
677    const struct switch_attr *attr;
678    struct switch_dev *dev;
679    struct sk_buff *msg = NULL;
680    struct switch_val val;
681    int err = -EINVAL;
682    int cmd = hdr->cmd;
683
684    dev = swconfig_get_dev(info);
685    if (!dev)
686        return -EINVAL;
687
688    memset(&val, 0, sizeof(val));
689    attr = swconfig_lookup_attr(dev, info, &val);
690    if (!attr || !attr->get)
691        goto error;
692
693    if (attr->type == SWITCH_TYPE_PORTS) {
694        val.value.ports = dev->portbuf;
695        memset(dev->portbuf, 0,
696            sizeof(struct switch_port) * dev->ports);
697    }
698
699    err = attr->get(dev, attr, &val);
700    if (err)
701        goto error;
702
703    msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
704    if (!msg)
705        goto error;
706
707    hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, &switch_fam,
708            0, cmd);
709    if (IS_ERR(hdr))
710        goto nla_put_failure;
711
712    switch(attr->type) {
713    case SWITCH_TYPE_INT:
714        NLA_PUT_U32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i);
715        break;
716    case SWITCH_TYPE_STRING:
717        NLA_PUT_STRING(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s);
718        break;
719    case SWITCH_TYPE_PORTS:
720        err = swconfig_send_ports(&msg, info,
721                SWITCH_ATTR_OP_VALUE_PORTS, &val);
722        if (err < 0)
723            goto nla_put_failure;
724        break;
725    default:
726        DPRINTF("invalid type in attribute\n");
727        err = -EINVAL;
728        goto error;
729    }
730    err = genlmsg_end(msg, hdr);
731    if (err < 0)
732        goto nla_put_failure;
733
734    swconfig_put_dev(dev);
735    return genlmsg_unicast(msg, info->snd_pid);
736
737nla_put_failure:
738    if (msg)
739        nlmsg_free(msg);
740error:
741    swconfig_put_dev(dev);
742    if (!err)
743        err = -ENOMEM;
744    return err;
745}
746
747static int
748swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
749        const struct switch_dev *dev)
750{
751    void *hdr;
752
753    hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
754            SWITCH_CMD_NEW_ATTR);
755    if (IS_ERR(hdr))
756        return -1;
757
758    NLA_PUT_U32(msg, SWITCH_ATTR_ID, dev->id);
759    NLA_PUT_STRING(msg, SWITCH_ATTR_NAME, dev->name);
760    NLA_PUT_STRING(msg, SWITCH_ATTR_DEV_NAME, dev->devname);
761    NLA_PUT_U32(msg, SWITCH_ATTR_VLANS, dev->vlans);
762    NLA_PUT_U32(msg, SWITCH_ATTR_PORTS, dev->ports);
763    NLA_PUT_U32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port);
764
765    return genlmsg_end(msg, hdr);
766nla_put_failure:
767    genlmsg_cancel(msg, hdr);
768    return -EMSGSIZE;
769}
770
771static int swconfig_dump_switches(struct sk_buff *skb,
772        struct netlink_callback *cb)
773{
774    struct switch_dev *dev;
775    int start = cb->args[0];
776    int idx = 0;
777
778    swconfig_lock();
779    list_for_each_entry(dev, &swdevs, dev_list) {
780        if (++idx <= start)
781            continue;
782        if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).pid,
783                cb->nlh->nlmsg_seq, NLM_F_MULTI,
784                dev) < 0)
785            break;
786    }
787    swconfig_unlock();
788    cb->args[0] = idx;
789
790    return skb->len;
791}
792
793static int
794swconfig_done(struct netlink_callback *cb)
795{
796    return 0;
797}
798
799static struct genl_ops swconfig_ops[] = {
800    {
801        .cmd = SWITCH_CMD_LIST_GLOBAL,
802        .doit = swconfig_list_attrs,
803        .policy = switch_policy,
804    },
805    {
806        .cmd = SWITCH_CMD_LIST_VLAN,
807        .doit = swconfig_list_attrs,
808        .policy = switch_policy,
809    },
810    {
811        .cmd = SWITCH_CMD_LIST_PORT,
812        .doit = swconfig_list_attrs,
813        .policy = switch_policy,
814    },
815    {
816        .cmd = SWITCH_CMD_GET_GLOBAL,
817        .doit = swconfig_get_attr,
818        .policy = switch_policy,
819    },
820    {
821        .cmd = SWITCH_CMD_GET_VLAN,
822        .doit = swconfig_get_attr,
823        .policy = switch_policy,
824    },
825    {
826        .cmd = SWITCH_CMD_GET_PORT,
827        .doit = swconfig_get_attr,
828        .policy = switch_policy,
829    },
830    {
831        .cmd = SWITCH_CMD_SET_GLOBAL,
832        .doit = swconfig_set_attr,
833        .policy = switch_policy,
834    },
835    {
836        .cmd = SWITCH_CMD_SET_VLAN,
837        .doit = swconfig_set_attr,
838        .policy = switch_policy,
839    },
840    {
841        .cmd = SWITCH_CMD_SET_PORT,
842        .doit = swconfig_set_attr,
843        .policy = switch_policy,
844    },
845    {
846        .cmd = SWITCH_CMD_GET_SWITCH,
847        .dumpit = swconfig_dump_switches,
848        .policy = switch_policy,
849        .done = swconfig_done,
850    }
851};
852
853int
854register_switch(struct switch_dev *dev, struct net_device *netdev)
855{
856    INIT_LIST_HEAD(&dev->dev_list);
857    if (netdev) {
858        dev->netdev = netdev;
859        if (!dev->devname)
860            dev->devname = netdev->name;
861    }
862    BUG_ON(!dev->devname);
863
864    if (dev->ports > 0) {
865        dev->portbuf = kzalloc(sizeof(struct switch_port) * dev->ports,
866                GFP_KERNEL);
867        if (!dev->portbuf)
868            return -ENOMEM;
869    }
870    dev->id = ++swdev_id;
871    swconfig_defaults_init(dev);
872    spin_lock_init(&dev->lock);
873    swconfig_lock();
874    list_add(&dev->dev_list, &swdevs);
875    swconfig_unlock();
876
877    return 0;
878}
879EXPORT_SYMBOL_GPL(register_switch);
880
881void
882unregister_switch(struct switch_dev *dev)
883{
884    kfree(dev->portbuf);
885    spin_lock(&dev->lock);
886    swconfig_lock();
887    list_del(&dev->dev_list);
888    swconfig_unlock();
889    spin_unlock(&dev->lock);
890}
891EXPORT_SYMBOL_GPL(unregister_switch);
892
893
894static int __init
895swconfig_init(void)
896{
897    int i, err;
898
899    INIT_LIST_HEAD(&swdevs);
900    err = genl_register_family(&switch_fam);
901    if (err)
902        return err;
903
904    for (i = 0; i < ARRAY_SIZE(swconfig_ops); i++) {
905        err = genl_register_ops(&switch_fam, &swconfig_ops[i]);
906        if (err)
907            goto unregister;
908    }
909
910    return 0;
911
912unregister:
913    genl_unregister_family(&switch_fam);
914    return err;
915}
916
917static void __exit
918swconfig_exit(void)
919{
920    genl_unregister_family(&switch_fam);
921}
922
923module_init(swconfig_init);
924module_exit(swconfig_exit);
925
926

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