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bridge: make bridge support netpoll 

Based on the previous patch, make bridge support netpoll by:

1) implement the 2 methods to support netpoll for bridge;

2) modify netpoll during forwarding packets via bridge;

3) disable netpoll support of bridge when a netpoll-unabled device
   is added to bridge;

4) enable netpoll support when all underlying devices support netpoll.

Cc: David Miller <davem@davemloft.net>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: WANG Cong <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2010-05-06 00:48:24 -07:00 committed by David S. Miller
parent 0e34e93177
commit c06ee961d3
4 changed files with 108 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
net/bridge/br_device.c
View File

@ -13,8 +13,10 @@
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netpoll.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/list.h>
#include <asm/uaccess.h>
#include "br_private.h"
@ -188,6 +190,59 @@ static int br_set_tx_csum(struct net_device *dev, u32 data)
return 0;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
bool br_devices_support_netpoll(struct net_bridge *br)
{
struct net_bridge_port *p;
bool ret = true;
int count = 0;
unsigned long flags;
spin_lock_irqsave(&br->lock, flags);
list_for_each_entry(p, &br->port_list, list) {
count++;
if ((p->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
!p->dev->netdev_ops->ndo_poll_controller)
ret = false;
}
spin_unlock_irqrestore(&br->lock, flags);
return count != 0 && ret;
}
static void br_poll_controller(struct net_device *br_dev)
{
struct netpoll *np = br_dev->npinfo->netpoll;
if (np->real_dev != br_dev)
netpoll_poll_dev(np->real_dev);
}
void br_netpoll_cleanup(struct net_device *br_dev)
{
struct net_bridge *br = netdev_priv(br_dev);
struct net_bridge_port *p, *n;
const struct net_device_ops *ops;
br->dev->npinfo = NULL;
list_for_each_entry_safe(p, n, &br->port_list, list) {
if (p->dev) {
ops = p->dev->netdev_ops;
if (ops->ndo_netpoll_cleanup)
ops->ndo_netpoll_cleanup(p->dev);
else
p->dev->npinfo = NULL;
}
}
}
#else
void br_netpoll_cleanup(struct net_device *br_dev)
{
}
#endif
static const struct ethtool_ops br_ethtool_ops = {
.get_drvinfo = br_getinfo,
.get_link = ethtool_op_get_link,
@ -211,6 +266,10 @@ static const struct net_device_ops br_netdev_ops = {
.ndo_set_multicast_list = br_dev_set_multicast_list,
.ndo_change_mtu = br_change_mtu,
.ndo_do_ioctl = br_dev_ioctl,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_netpoll_cleanup = br_netpoll_cleanup,
.ndo_poll_controller = br_poll_controller,
#endif
};
static void br_dev_free(struct net_device *dev)

23
net/bridge/br_forward.c
View File

@ -15,6 +15,7 @@
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netpoll.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#include <linux/netfilter_bridge.h>
@ -50,7 +51,13 @@ int br_dev_queue_push_xmit(struct sk_buff *skb)
else {
skb_push(skb, ETH_HLEN);
dev_queue_xmit(skb);
#ifdef CONFIG_NET_POLL_CONTROLLER
if (unlikely(skb->dev->priv_flags & IFF_IN_NETPOLL)) {
netpoll_send_skb(skb->dev->npinfo->netpoll, skb);
skb->dev->priv_flags &= ~IFF_IN_NETPOLL;
} else
#endif
dev_queue_xmit(skb);
}
}
@ -66,9 +73,23 @@ int br_forward_finish(struct sk_buff *skb)
static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
{
#ifdef CONFIG_NET_POLL_CONTROLLER
struct net_bridge *br = to->br;
if (unlikely(br->dev->priv_flags & IFF_IN_NETPOLL)) {
struct netpoll *np;
to->dev->npinfo = skb->dev->npinfo;
np = skb->dev->npinfo->netpoll;
np->real_dev = np->dev = to->dev;
to->dev->priv_flags |= IFF_IN_NETPOLL;
}
#endif
skb->dev = to->dev;
NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
br_forward_finish);
#ifdef CONFIG_NET_POLL_CONTROLLER
if (skb->dev->npinfo)
skb->dev->npinfo->netpoll->dev = br->dev;
#endif
}
static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)

25
net/bridge/br_if.c
View File

@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netpoll.h>
#include <linux/ethtool.h>
#include <linux/if_arp.h>
#include <linux/module.h>
@ -153,6 +154,14 @@ static void del_nbp(struct net_bridge_port *p)
kobject_uevent(&p->kobj, KOBJ_REMOVE);
kobject_del(&p->kobj);
#ifdef CONFIG_NET_POLL_CONTROLLER
if (br_devices_support_netpoll(br))
br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
if (dev->netdev_ops->ndo_netpoll_cleanup)
dev->netdev_ops->ndo_netpoll_cleanup(dev);
else
dev->npinfo = NULL;
#endif
call_rcu(&p->rcu, destroy_nbp_rcu);
}
@ -165,6 +174,8 @@ static void del_br(struct net_bridge *br, struct list_head *head)
del_nbp(p);
}
br_netpoll_cleanup(br->dev);
del_timer_sync(&br->gc_timer);
br_sysfs_delbr(br->dev);
@ -444,6 +455,20 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
kobject_uevent(&p->kobj, KOBJ_ADD);
#ifdef CONFIG_NET_POLL_CONTROLLER
if (br_devices_support_netpoll(br)) {
br->dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
if (br->dev->npinfo)
dev->npinfo = br->dev->npinfo;
} else if (!(br->dev->priv_flags & IFF_DISABLE_NETPOLL)) {
br->dev->priv_flags |= IFF_DISABLE_NETPOLL;
printk(KERN_INFO "New device %s does not support netpoll\n",
dev->name);
printk(KERN_INFO "Disabling netpoll for %s\n",
br->dev->name);
}
#endif
return 0;
err2:
br_fdb_delete_by_port(br, p, 1);

2
net/bridge/br_private.h
View File

@ -253,6 +253,8 @@ static inline int br_is_root_bridge(const struct net_bridge *br)
extern void br_dev_setup(struct net_device *dev);
extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
struct net_device *dev);
extern bool br_devices_support_netpoll(struct net_bridge *br);
extern void br_netpoll_cleanup(struct net_device *br_dev);
/* br_fdb.c */
extern int br_fdb_init(void);