openwrtv4/target/linux/generic-2.6/files/drivers/net/phy/swconfig.c
Felix Fietkau 787e9fcf93 swconfig: treat struct switch_attr as constant
SVN-Revision: 15302
2009-04-20 18:57:36 +00:00

870 lines
18 KiB
C

/*
* swconfig.c: Switch configuration API
*
* Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/capability.h>
#include <linux/skbuff.h>
#include <linux/switch.h>
//#define DEBUG 1
#ifdef DEBUG
#define DPRINTF(format, ...) printk("%s: " format, __func__, ##__VA_ARGS__)
#else
#define DPRINTF(...) do {} while(0)
#endif
MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
MODULE_LICENSE("GPL");
static int swdev_id = 0;
static struct list_head swdevs;
static spinlock_t swdevs_lock = SPIN_LOCK_UNLOCKED;
struct swconfig_callback;
struct swconfig_callback
{
struct sk_buff *msg;
struct genlmsghdr *hdr;
struct genl_info *info;
int cmd;
/* callback for filling in the message data */
int (*fill)(struct swconfig_callback *cb, void *arg);
/* callback for closing the message before sending it */
int (*close)(struct swconfig_callback *cb, void *arg);
struct nlattr *nest[4];
int args[4];
};
/* defaults */
static int
swconfig_get_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
int ret;
if (val->port_vlan >= dev->vlans)
return -EINVAL;
if (!dev->get_vlan_ports)
return -EOPNOTSUPP;
ret = dev->get_vlan_ports(dev, val);
return ret;
}
static int
swconfig_set_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
int i;
if (val->port_vlan >= dev->vlans)
return -EINVAL;
/* validate ports */
if (val->len > dev->ports)
return -EINVAL;
for (i = 0; i < val->len; i++) {
if (val->value.ports[i].id >= dev->ports)
return -EINVAL;
}
if (!dev->set_vlan_ports)
return -EOPNOTSUPP;
return dev->set_vlan_ports(dev, val);
}
static int
swconfig_apply_config(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
{
/* don't complain if not supported by the switch driver */
if (!dev->apply_config)
return 0;
return dev->apply_config(dev);
}
enum global_defaults {
GLOBAL_APPLY,
};
enum vlan_defaults {
VLAN_PORTS,
};
enum port_defaults {
PORT_LINK,
};
static struct switch_attr default_global[] = {
[GLOBAL_APPLY] = {
.type = SWITCH_TYPE_NOVAL,
.name = "apply",
.description = "Activate changes in the hardware",
.set = swconfig_apply_config,
}
};
static struct switch_attr default_port[] = {
[PORT_LINK] = {
.type = SWITCH_TYPE_INT,
.name = "link",
.description = "Current link speed",
}
};
static struct switch_attr default_vlan[] = {
[VLAN_PORTS] = {
.type = SWITCH_TYPE_PORTS,
.name = "ports",
.description = "VLAN port mapping",
.set = swconfig_set_vlan_ports,
.get = swconfig_get_vlan_ports,
},
};
static void swconfig_defaults_init(struct switch_dev *dev)
{
dev->def_global = 0;
dev->def_vlan = 0;
dev->def_port = 0;
if (dev->get_vlan_ports || dev->set_vlan_ports)
set_bit(VLAN_PORTS, &dev->def_vlan);
/* always present, can be no-op */
set_bit(GLOBAL_APPLY, &dev->def_global);
}
static struct genl_family switch_fam = {
.id = GENL_ID_GENERATE,
.name = "switch",
.hdrsize = 0,
.version = 1,
.maxattr = SWITCH_ATTR_MAX,
};
static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
[SWITCH_ATTR_ID] = { .type = NLA_U32 },
[SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
[SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
[SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
[SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
[SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
[SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
[SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
};
static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
[SWITCH_PORT_ID] = { .type = NLA_U32 },
[SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
};
static inline void
swconfig_lock(void)
{
spin_lock(&swdevs_lock);
}
static inline void
swconfig_unlock(void)
{
spin_unlock(&swdevs_lock);
}
static struct switch_dev *
swconfig_get_dev(struct genl_info *info)
{
struct switch_dev *dev = NULL;
struct switch_dev *p;
int id;
if (!info->attrs[SWITCH_ATTR_ID])
goto done;
id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
swconfig_lock();
list_for_each_entry(p, &swdevs, dev_list) {
if (id != p->id)
continue;
dev = p;
break;
}
if (dev)
spin_lock(&dev->lock);
else
DPRINTF("device %d not found\n", id);
swconfig_unlock();
done:
return dev;
}
static inline void
swconfig_put_dev(struct switch_dev *dev)
{
spin_unlock(&dev->lock);
}
static int
swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
{
struct switch_attr *op = arg;
struct genl_info *info = cb->info;
struct sk_buff *msg = cb->msg;
int id = cb->args[0];
void *hdr;
hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, &switch_fam,
NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
if (IS_ERR(hdr))
return -1;
NLA_PUT_U32(msg, SWITCH_ATTR_OP_ID, id);
NLA_PUT_U32(msg, SWITCH_ATTR_OP_TYPE, op->type);
NLA_PUT_STRING(msg, SWITCH_ATTR_OP_NAME, op->name);
if (op->description)
NLA_PUT_STRING(msg, SWITCH_ATTR_OP_DESCRIPTION,
op->description);
return genlmsg_end(msg, hdr);
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/* spread multipart messages across multiple message buffers */
static int
swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
{
struct genl_info *info = cb->info;
int restart = 0;
int err;
do {
if (!cb->msg) {
cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (cb->msg == NULL)
goto error;
}
if (!(cb->fill(cb, arg) < 0))
break;
/* fill failed, check if this was already the second attempt */
if (restart)
goto error;
/* try again in a new message, send the current one */
restart = 1;
if (cb->close) {
if (cb->close(cb, arg) < 0)
goto error;
}
err = genlmsg_unicast(cb->msg, info->snd_pid);
cb->msg = NULL;
if (err < 0)
goto error;
} while (restart);
return 0;
error:
if (cb->msg)
nlmsg_free(cb->msg);
return -1;
}
static int
swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
{
struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
const struct switch_attrlist *alist;
struct switch_dev *dev;
struct swconfig_callback cb;
int err = -EINVAL;
int i;
/* defaults */
struct switch_attr *def_list;
unsigned long *def_active;
int n_def;
dev = swconfig_get_dev(info);
if (!dev)
return -EINVAL;
switch(hdr->cmd) {
case SWITCH_CMD_LIST_GLOBAL:
alist = &dev->attr_global;
def_list = default_global;
def_active = &dev->def_global;
n_def = ARRAY_SIZE(default_global);
break;
case SWITCH_CMD_LIST_VLAN:
alist = &dev->attr_vlan;
def_list = default_vlan;
def_active = &dev->def_vlan;
n_def = ARRAY_SIZE(default_vlan);
break;
case SWITCH_CMD_LIST_PORT:
alist = &dev->attr_port;
def_list = default_port;
def_active = &dev->def_port;
n_def = ARRAY_SIZE(default_port);
break;
default:
WARN_ON(1);
goto out;
}
memset(&cb, 0, sizeof(cb));
cb.info = info;
cb.fill = swconfig_dump_attr;
for (i = 0; i < alist->n_attr; i++) {
if (alist->attr[i].disabled)
continue;
cb.args[0] = i;
err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
if (err < 0)
goto error;
}
/* defaults */
for (i = 0; i < n_def; i++) {
if (!test_bit(i, def_active))
continue;
cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
if (err < 0)
goto error;
}
swconfig_put_dev(dev);
if (!cb.msg)
return 0;
return genlmsg_unicast(cb.msg, info->snd_pid);
error:
if (cb.msg)
nlmsg_free(cb.msg);
out:
swconfig_put_dev(dev);
return err;
}
static const struct switch_attr *
swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
struct switch_val *val)
{
struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
const struct switch_attrlist *alist;
const struct switch_attr *attr = NULL;
int attr_id;
/* defaults */
struct switch_attr *def_list;
unsigned long *def_active;
int n_def;
if (!info->attrs[SWITCH_ATTR_OP_ID])
goto done;
switch(hdr->cmd) {
case SWITCH_CMD_SET_GLOBAL:
case SWITCH_CMD_GET_GLOBAL:
alist = &dev->attr_global;
def_list = default_global;
def_active = &dev->def_global;
n_def = ARRAY_SIZE(default_global);
break;
case SWITCH_CMD_SET_VLAN:
case SWITCH_CMD_GET_VLAN:
alist = &dev->attr_vlan;
def_list = default_vlan;
def_active = &dev->def_vlan;
n_def = ARRAY_SIZE(default_vlan);
if (!info->attrs[SWITCH_ATTR_OP_VLAN])
goto done;
val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
break;
case SWITCH_CMD_SET_PORT:
case SWITCH_CMD_GET_PORT:
alist = &dev->attr_port;
def_list = default_port;
def_active = &dev->def_port;
n_def = ARRAY_SIZE(default_port);
if (!info->attrs[SWITCH_ATTR_OP_PORT])
goto done;
val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
break;
default:
WARN_ON(1);
goto done;
}
if (!alist)
goto done;
attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
if (attr_id >= n_def)
goto done;
if (!test_bit(attr_id, def_active))
goto done;
attr = &def_list[attr_id];
} else {
if (attr_id >= alist->n_attr)
goto done;
attr = &alist->attr[attr_id];
}
if (attr->disabled)
attr = NULL;
done:
if (!attr)
DPRINTF("attribute lookup failed\n");
val->attr = attr;
return attr;
}
static int
swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
struct switch_val *val, int max)
{
struct nlattr *nla;
int rem;
val->len = 0;
nla_for_each_nested(nla, head, rem) {
struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
struct switch_port *port = &val->value.ports[val->len];
if (val->len >= max)
return -EINVAL;
if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
port_policy))
return -EINVAL;
if (!tb[SWITCH_PORT_ID])
return -EINVAL;
port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
if (tb[SWITCH_PORT_FLAG_TAGGED])
port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
val->len++;
}
return 0;
}
static int
swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
{
const struct switch_attr *attr;
struct switch_dev *dev;
struct switch_val val;
int err = -EINVAL;
dev = swconfig_get_dev(info);
if (!dev)
return -EINVAL;
memset(&val, 0, sizeof(val));
attr = swconfig_lookup_attr(dev, info, &val);
if (!attr || !attr->set)
goto error;
val.attr = attr;
switch(attr->type) {
case SWITCH_TYPE_NOVAL:
break;
case SWITCH_TYPE_INT:
if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
goto error;
val.value.i =
nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
break;
case SWITCH_TYPE_STRING:
if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
goto error;
val.value.s =
nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
break;
case SWITCH_TYPE_PORTS:
val.value.ports = dev->portbuf;
memset(dev->portbuf, 0,
sizeof(struct switch_port) * dev->ports);
/* TODO: implement multipart? */
if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
err = swconfig_parse_ports(skb,
info->attrs[SWITCH_ATTR_OP_VALUE_PORTS], &val, dev->ports);
if (err < 0)
goto error;
} else {
val.len = 0;
err = 0;
}
break;
default:
goto error;
}
err = attr->set(dev, attr, &val);
error:
swconfig_put_dev(dev);
return err;
}
static int
swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
{
if (cb->nest[0])
nla_nest_end(cb->msg, cb->nest[0]);
return 0;
}
static int
swconfig_send_port(struct swconfig_callback *cb, void *arg)
{
const struct switch_port *port = arg;
struct nlattr *p = NULL;
if (!cb->nest[0]) {
cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
if (!cb->nest[0])
return -1;
}
p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
if (!p)
goto error;
NLA_PUT_U32(cb->msg, SWITCH_PORT_ID, port->id);
if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED))
NLA_PUT_FLAG(cb->msg, SWITCH_PORT_FLAG_TAGGED);
nla_nest_end(cb->msg, p);
return 0;
nla_put_failure:
nla_nest_cancel(cb->msg, p);
error:
nla_nest_cancel(cb->msg, cb->nest[0]);
return -1;
}
static int
swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
const struct switch_val *val)
{
struct swconfig_callback cb;
int err = 0;
int i;
if (!val->value.ports)
return -EINVAL;
memset(&cb, 0, sizeof(cb));
cb.cmd = attr;
cb.msg = *msg;
cb.info = info;
cb.fill = swconfig_send_port;
cb.close = swconfig_close_portlist;
cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
for (i = 0; i < val->len; i++) {
err = swconfig_send_multipart(&cb, &val->value.ports[i]);
if (err)
goto done;
}
err = val->len;
swconfig_close_portlist(&cb, NULL);
*msg = cb.msg;
done:
return err;
}
static int
swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
{
struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
const struct switch_attr *attr;
struct switch_dev *dev;
struct sk_buff *msg = NULL;
struct switch_val val;
int err = -EINVAL;
int cmd = hdr->cmd;
dev = swconfig_get_dev(info);
if (!dev)
return -EINVAL;
memset(&val, 0, sizeof(val));
attr = swconfig_lookup_attr(dev, info, &val);
if (!attr || !attr->get)
goto error_dev;
if (attr->type == SWITCH_TYPE_PORTS) {
val.value.ports = dev->portbuf;
memset(dev->portbuf, 0,
sizeof(struct switch_port) * dev->ports);
}
err = attr->get(dev, attr, &val);
if (err)
goto error;
msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg)
goto error;
hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, &switch_fam,
0, cmd);
if (IS_ERR(hdr))
goto nla_put_failure;
switch(attr->type) {
case SWITCH_TYPE_INT:
NLA_PUT_U32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i);
break;
case SWITCH_TYPE_STRING:
NLA_PUT_STRING(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s);
break;
case SWITCH_TYPE_PORTS:
err = swconfig_send_ports(&msg, info,
SWITCH_ATTR_OP_VALUE_PORTS, &val);
if (err < 0)
goto nla_put_failure;
break;
default:
DPRINTF("invalid type in attribute\n");
err = -EINVAL;
goto error;
}
err = genlmsg_end(msg, hdr);
if (err < 0)
goto nla_put_failure;
swconfig_put_dev(dev);
return genlmsg_unicast(msg, info->snd_pid);
nla_put_failure:
if (msg)
nlmsg_free(msg);
error_dev:
swconfig_put_dev(dev);
error:
if (!err)
err = -ENOMEM;
return err;
}
static int
swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
const struct switch_dev *dev)
{
void *hdr;
hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
SWITCH_CMD_NEW_ATTR);
if (IS_ERR(hdr))
return -1;
NLA_PUT_U32(msg, SWITCH_ATTR_ID, dev->id);
NLA_PUT_STRING(msg, SWITCH_ATTR_NAME, dev->name);
NLA_PUT_STRING(msg, SWITCH_ATTR_DEV_NAME, dev->devname);
NLA_PUT_U32(msg, SWITCH_ATTR_VLANS, dev->vlans);
NLA_PUT_U32(msg, SWITCH_ATTR_PORTS, dev->ports);
return genlmsg_end(msg, hdr);
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
static int swconfig_dump_switches(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct switch_dev *dev;
int start = cb->args[0];
int idx = 0;
swconfig_lock();
list_for_each_entry(dev, &swdevs, dev_list) {
if (++idx <= start)
continue;
if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
dev) < 0)
break;
}
swconfig_unlock();
cb->args[0] = idx;
return skb->len;
}
static int
swconfig_done(struct netlink_callback *cb)
{
return 0;
}
static struct genl_ops swconfig_ops[] = {
{
.cmd = SWITCH_CMD_LIST_GLOBAL,
.doit = swconfig_list_attrs,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_LIST_VLAN,
.doit = swconfig_list_attrs,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_LIST_PORT,
.doit = swconfig_list_attrs,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_GET_GLOBAL,
.doit = swconfig_get_attr,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_GET_VLAN,
.doit = swconfig_get_attr,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_GET_PORT,
.doit = swconfig_get_attr,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_SET_GLOBAL,
.doit = swconfig_set_attr,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_SET_VLAN,
.doit = swconfig_set_attr,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_SET_PORT,
.doit = swconfig_set_attr,
.policy = switch_policy,
},
{
.cmd = SWITCH_CMD_GET_SWITCH,
.dumpit = swconfig_dump_switches,
.policy = switch_policy,
.done = swconfig_done,
}
};
int
register_switch(struct switch_dev *dev, struct net_device *netdev)
{
INIT_LIST_HEAD(&dev->dev_list);
if (netdev) {
dev->netdev = netdev;
if (!dev->devname)
dev->devname = netdev->name;
}
BUG_ON(!dev->devname);
if (dev->ports > 0) {
dev->portbuf = kzalloc(sizeof(struct switch_port) * dev->ports,
GFP_KERNEL);
if (!dev->portbuf)
return -ENOMEM;
}
dev->id = ++swdev_id;
swconfig_defaults_init(dev);
spin_lock_init(&dev->lock);
swconfig_lock();
list_add(&dev->dev_list, &swdevs);
swconfig_unlock();
return 0;
}
EXPORT_SYMBOL_GPL(register_switch);
void
unregister_switch(struct switch_dev *dev)
{
kfree(dev->portbuf);
spin_lock(&dev->lock);
swconfig_lock();
list_del(&dev->dev_list);
swconfig_unlock();
}
EXPORT_SYMBOL_GPL(unregister_switch);
static int __init
swconfig_init(void)
{
int i, err;
INIT_LIST_HEAD(&swdevs);
err = genl_register_family(&switch_fam);
if (err)
return err;
for (i = 0; i < ARRAY_SIZE(swconfig_ops); i++) {
err = genl_register_ops(&switch_fam, &swconfig_ops[i]);
if (err)
goto unregister;
}
return 0;
unregister:
genl_unregister_family(&switch_fam);
return err;
}
static void __exit
swconfig_exit(void)
{
genl_unregister_family(&switch_fam);
}
module_init(swconfig_init);
module_exit(swconfig_exit);