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OpenCloudOS-Kernel
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bridge: update max_gso_segs and max_gso_size 

It can be useful to lower max_gso_segs on NIC with very low
number of TX descriptors like bcmgenet.

However, this is defeated by bridge since it does not propagate
the lower value of max_gso_segs and max_gso_size.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Petri Gynther <pgynther@google.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-03-21 09:55:11 -07:00 committed by David S. Miller
parent c70ce028e8
commit ae74f10068
1 changed files with 16 additions and 0 deletions
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16
net/bridge/br_if.c
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@ -437,6 +437,20 @@ int br_min_mtu(const struct net_bridge *br)
return mtu;
}
static void br_set_gso_limits(struct net_bridge *br)
{
unsigned int gso_max_size = GSO_MAX_SIZE;
u16 gso_max_segs = GSO_MAX_SEGS;
const struct net_bridge_port *p;
list_for_each_entry(p, &br->port_list, list) {
gso_max_size = min(gso_max_size, p->dev->gso_max_size);
gso_max_segs = min(gso_max_segs, p->dev->gso_max_segs);
}
br->dev->gso_max_size = gso_max_size;
br->dev->gso_max_segs = gso_max_segs;
}
/*
* Recomputes features using slave's features
*/
@ -564,6 +578,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
dev_set_mtu(br->dev, br_min_mtu(br));
br_set_gso_limits(br);
kobject_uevent(&p->kobj, KOBJ_ADD);
@ -610,6 +625,7 @@ int br_del_if(struct net_bridge *br, struct net_device *dev)
del_nbp(p);
dev_set_mtu(br->dev, br_min_mtu(br));
br_set_gso_limits(br);
spin_lock_bh(&br->lock);
changed_addr = br_stp_recalculate_bridge_id(br);