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switchdev: introduce switchdev add/del obj ops

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Like switchdev attr get/set, add new switchdev obj add/del.  switchdev objs
will be things like VLANs or FIB entries, so add/del fits better for
objects than get/set used for attributes.

Use same two-phase prepare-commit transaction model as in attr set.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Scott Feldman 2015-05-10 09:47:52 -07:00 committed by David S. Miller
parent 3563606258
commit 491d0f1533
2 changed files with 138 additions and 0 deletions
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31
include/net/switchdev.h
View File

@ -41,6 +41,15 @@ struct switchdev_attr {
struct fib_info;
enum switchdev_obj_id {
SWITCHDEV_OBJ_UNDEFINED,
};
struct switchdev_obj {
enum switchdev_obj_id id;
enum switchdev_trans trans;
};
/**
* struct switchdev_ops - switchdev operations
*
@ -48,6 +57,10 @@ struct fib_info;
*
* @switchdev_port_attr_set: Set a port attribute (see switchdev_attr).
*
* @switchdev_port_obj_add: Add an object to port (see switchdev_obj).
*
* @switchdev_port_obj_del: Delete an object from port (see switchdev_obj).
*
* @switchdev_fib_ipv4_add: Called to add/modify IPv4 route to switch device.
*
* @switchdev_fib_ipv4_del: Called to delete IPv4 route from switch device.
@ -57,6 +70,10 @@ struct switchdev_ops {
struct switchdev_attr *attr);
int (*switchdev_port_attr_set)(struct net_device *dev,
struct switchdev_attr *attr);
int (*switchdev_port_obj_add)(struct net_device *dev,
struct switchdev_obj *obj);
int (*switchdev_port_obj_del)(struct net_device *dev,
struct switchdev_obj *obj);
int (*switchdev_fib_ipv4_add)(struct net_device *dev, __be32 dst,
int dst_len, struct fib_info *fi,
u8 tos, u8 type, u32 nlflags,
@ -93,6 +110,8 @@ int switchdev_port_attr_get(struct net_device *dev,
struct switchdev_attr *attr);
int switchdev_port_attr_set(struct net_device *dev,
struct switchdev_attr *attr);
int switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj);
int switchdev_port_obj_del(struct net_device *dev, struct switchdev_obj *obj);
int register_switchdev_notifier(struct notifier_block *nb);
int unregister_switchdev_notifier(struct notifier_block *nb);
int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
@ -125,6 +144,18 @@ static inline int switchdev_port_attr_set(struct net_device *dev,
return -EOPNOTSUPP;
}
static inline int switchdev_port_obj_add(struct net_device *dev,
struct switchdev_obj *obj)
{
return -EOPNOTSUPP;
}
static inline int switchdev_port_obj_del(struct net_device *dev,
struct switchdev_obj *obj)
{
return -EOPNOTSUPP;
}
static inline int register_switchdev_notifier(struct notifier_block *nb)
{
return 0;

107
net/switchdev/switchdev.c
View File

@ -187,6 +187,113 @@ int switchdev_port_attr_set(struct net_device *dev, struct switchdev_attr *attr)
}
EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
int __switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj)
{
const struct switchdev_ops *ops = dev->switchdev_ops;
struct net_device *lower_dev;
struct list_head *iter;
int err = -EOPNOTSUPP;
if (ops && ops->switchdev_port_obj_add)
return ops->switchdev_port_obj_add(dev, obj);
/* Switch device port(s) may be stacked under
* bond/team/vlan dev, so recurse down to add object on
* each port.
*/
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = __switchdev_port_obj_add(lower_dev, obj);
if (err)
break;
}
return err;
}
/**
* switchdev_port_obj_add - Add port object
*
* @dev: port device
* @obj: object to add
*
* Use a 2-phase prepare-commit transaction model to ensure
* system is not left in a partially updated state due to
* failure from driver/device.
*
* rtnl_lock must be held.
*/
int switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj)
{
int err;
ASSERT_RTNL();
/* Phase I: prepare for obj add. Driver/device should fail
* here if there are going to be issues in the commit phase,
* such as lack of resources or support. The driver/device
* should reserve resources needed for the commit phase here,
* but should not commit the obj.
*/
obj->trans = SWITCHDEV_TRANS_PREPARE;
err = __switchdev_port_obj_add(dev, obj);
if (err) {
/* Prepare phase failed: abort the transaction. Any
* resources reserved in the prepare phase are
* released.
*/
obj->trans = SWITCHDEV_TRANS_ABORT;
__switchdev_port_obj_add(dev, obj);
return err;
}
/* Phase II: commit obj add. This cannot fail as a fault
* of driver/device. If it does, it's a bug in the driver/device
* because the driver said everythings was OK in phase I.
*/
obj->trans = SWITCHDEV_TRANS_COMMIT;
err = __switchdev_port_obj_add(dev, obj);
WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
/**
* switchdev_port_obj_del - Delete port object
*
* @dev: port device
* @obj: object to delete
*/
int switchdev_port_obj_del(struct net_device *dev, struct switchdev_obj *obj)
{
const struct switchdev_ops *ops = dev->switchdev_ops;
struct net_device *lower_dev;
struct list_head *iter;
int err = -EOPNOTSUPP;
if (ops && ops->switchdev_port_obj_del)
return ops->switchdev_port_obj_del(dev, obj);
/* Switch device port(s) may be stacked under
* bond/team/vlan dev, so recurse down to delete object on
* each port.
*/
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = switchdev_port_obj_del(lower_dev, obj);
if (err)
break;
}
return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
static DEFINE_MUTEX(switchdev_mutex);
static RAW_NOTIFIER_HEAD(switchdev_notif_chain);