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switchdev: add offload_fwd_mark generator helper

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skb->offload_fwd_mark and dev->offload_fwd_mark are 32-bit and should be
unique for device and may even be unique for a sub-set of ports within
device, so add switchdev helper function to generate unique marks based on
port's switch ID and group_ifindex.  group_ifindex would typically be the
container dev's ifindex, such as the bridge's ifindex.

The generator uses a global hash table to store offload_fwd_marks hashed by
{switch ID, group_ifindex} key.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Scott Feldman 2015-07-18 18:24:50 -07:00 committed by David S. Miller
parent d754f98b50
commit 1a3b2ec93d
2 changed files with 112 additions and 0 deletions
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9
include/net/switchdev.h
View File

@ -157,6 +157,9 @@ int switchdev_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev, int idx);
void switchdev_port_fwd_mark_set(struct net_device *dev,
struct net_device *group_dev,
bool joining);
#else
@ -271,6 +274,12 @@ static inline int switchdev_port_fdb_dump(struct sk_buff *skb,
return -EOPNOTSUPP;
}
static inline void switchdev_port_fwd_mark_set(struct net_device *dev,
struct net_device *group_dev,
bool joining)
{
}
#endif
#endif /* _LINUX_SWITCHDEV_H_ */

103
net/switchdev/switchdev.c
View File

@ -1039,3 +1039,106 @@ void switchdev_fib_ipv4_abort(struct fib_info *fi)
fi->fib_net->ipv4.fib_offload_disabled = true;
}
EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_abort);
static bool switchdev_port_same_parent_id(struct net_device *a,
struct net_device *b)
{
struct switchdev_attr a_attr = {
.id = SWITCHDEV_ATTR_PORT_PARENT_ID,
.flags = SWITCHDEV_F_NO_RECURSE,
};
struct switchdev_attr b_attr = {
.id = SWITCHDEV_ATTR_PORT_PARENT_ID,
.flags = SWITCHDEV_F_NO_RECURSE,
};
if (switchdev_port_attr_get(a, &a_attr) ||
switchdev_port_attr_get(b, &b_attr))
return false;
return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
}
static u32 switchdev_port_fwd_mark_get(struct net_device *dev,
struct net_device *group_dev)
{
struct net_device *lower_dev;
struct list_head *iter;
netdev_for_each_lower_dev(group_dev, lower_dev, iter) {
if (lower_dev == dev)
continue;
if (switchdev_port_same_parent_id(dev, lower_dev))
return lower_dev->offload_fwd_mark;
return switchdev_port_fwd_mark_get(dev, lower_dev);
}
return dev->ifindex;
}
static void switchdev_port_fwd_mark_reset(struct net_device *group_dev,
u32 old_mark, u32 *reset_mark)
{
struct net_device *lower_dev;
struct list_head *iter;
netdev_for_each_lower_dev(group_dev, lower_dev, iter) {
if (lower_dev->offload_fwd_mark == old_mark) {
if (!*reset_mark)
*reset_mark = lower_dev->ifindex;
lower_dev->offload_fwd_mark = *reset_mark;
}
switchdev_port_fwd_mark_reset(lower_dev, old_mark, reset_mark);
}
}
/**
* switchdev_port_fwd_mark_set - Set port offload forwarding mark
*
* @dev: port device
* @group_dev: containing device
* @joining: true if dev is joining group; false if leaving group
*
* An ungrouped port's offload mark is just its ifindex. A grouped
* port's (member of a bridge, for example) offload mark is the ifindex
* of one of the ports in the group with the same parent (switch) ID.
* Ports on the same device in the same group will have the same mark.
*
* Example:
*
* br0 ifindex=9
* sw1p1 ifindex=2 mark=2
* sw1p2 ifindex=3 mark=2
* sw2p1 ifindex=4 mark=5
* sw2p2 ifindex=5 mark=5
*
* If sw2p2 leaves the bridge, we'll have:
*
* br0 ifindex=9
* sw1p1 ifindex=2 mark=2
* sw1p2 ifindex=3 mark=2
* sw2p1 ifindex=4 mark=4
* sw2p2 ifindex=5 mark=5
*/
void switchdev_port_fwd_mark_set(struct net_device *dev,
struct net_device *group_dev,
bool joining)
{
u32 mark = dev->ifindex;
u32 reset_mark = 0;
if (group_dev && joining) {
mark = switchdev_port_fwd_mark_get(dev, group_dev);
} else if (group_dev && !joining) {
if (dev->offload_fwd_mark == mark)
/* Ohoh, this port was the mark reference port,
* but it's leaving the group, so reset the
* mark for the remaining ports in the group.
*/
switchdev_port_fwd_mark_reset(group_dev, mark,
&reset_mark);
}
dev->offload_fwd_mark = mark;
}
EXPORT_SYMBOL_GPL(switchdev_port_fwd_mark_set);