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From: Amerigo Wang on 22 Mar 2010 04:20

Based on Andy's work, but I modify a lot.

Similar to the patch for bridge, this patch does:

1) implement the 4 methods to support netpoll for bonding;

2) modify netpoll during forwarding packets in bonding;

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

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

Cc: Andy Gospodarek <gospo(a)redhat.com>
Cc: Neil Horman <nhorman(a)tuxdriver.com>
Cc: Jay Vosburgh <fubar(a)us.ibm.com>
Cc: David Miller <davem(a)davemloft.net>
Signed-off-by: WANG Cong <amwang(a)redhat.com>


---
Index: linux-2.6/drivers/net/bonding/bond_main.c
===================================================================
--- linux-2.6.orig/drivers/net/bonding/bond_main.c
+++ linux-2.6/drivers/net/bonding/bond_main.c
@@ -59,6 +59,7 @@
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
+#include <linux/netpoll.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/etherdevice.h>
@@ -430,7 +431,17 @@ int bond_dev_queue_xmit(struct bonding *
}

skb->priority = 1;
- dev_queue_xmit(skb);
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ if (bond->dev->priv_flags & IFF_IN_NETPOLL) {
+ bond->dev->npinfo->netpoll->dev = skb->dev;
+ if (!slave_dev->npinfo)
+ slave_dev->npinfo = bond->dev->npinfo;
+ slave_dev->priv_flags |= IFF_IN_NETPOLL;
+ netpoll_send_skb(bond->dev->npinfo->netpoll, skb);
+ slave_dev->priv_flags &= ~IFF_IN_NETPOLL;
+ } else
+#endif
+ dev_queue_xmit(skb);

return 0;
}
@@ -1324,6 +1335,87 @@ static void bond_detach_slave(struct bon
bond->slave_cnt--;
}

+#ifdef CONFIG_NET_POLL_CONTROLLER
+static bool slaves_support_netpoll(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave;
+ int i = 0;
+ bool ret = true;
+
+ read_lock_bh(&bond->lock);
+ bond_for_each_slave(bond, slave, i) {
+ if ((slave->dev->priv_flags & IFF_DISABLE_NETPOLL)
+ || !slave->dev->netdev_ops->ndo_poll_controller)
+ ret = false;
+ }
+ read_unlock_bh(&bond->lock);
+ return i != 0 && ret;
+}
+
+static void bond_poll_controller(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave;
+ int i;
+
+ read_lock(&bond->lock);
+ bond_for_each_slave(bond, slave, i) {
+ if (slave->dev->netdev_ops->ndo_poll_controller)
+ netpoll_poll_dev(slave->dev);
+ }
+ read_unlock(&bond->lock);
+}
+
+static void bond_netpoll_setup(struct net_device *bond_dev,
+ struct netpoll_info *npinfo)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave;
+ int i;
+
+ write_lock_bh(&bond->lock);
+ bond_for_each_slave(bond, slave, i) {
+ if (slave->dev)
+ slave->dev->npinfo = npinfo;
+ }
+ write_unlock_bh(&bond->lock);
+}
+
+static void bond_netpoll_cleanup(struct net_device *bond_dev)
+{
+ struct bonding *bond = netdev_priv(bond_dev);
+ struct slave *slave;
+ const struct net_device_ops *ops;
+ int i;
+
+ write_lock_bh(&bond->lock);
+ bond_dev->npinfo = NULL;
+ bond_for_each_slave(bond, slave, i) {
+ if (slave->dev) {
+ ops = slave->dev->netdev_ops;
+ if (ops->ndo_netpoll_cleanup)
+ ops->ndo_netpoll_cleanup(slave->dev);
+ else
+ slave->dev->npinfo = NULL;
+ }
+ }
+ write_unlock_bh(&bond->lock);
+}
+
+static int bond_netpoll_xmit(struct netpoll *np, struct sk_buff *skb,
+ struct net_device *dev)
+{
+ int ret;
+
+ dev->priv_flags |= IFF_IN_NETPOLL;
+ ret = dev->netdev_ops->ndo_start_xmit(skb, dev);
+ np->dev = dev;
+ dev->priv_flags &= ~IFF_IN_NETPOLL;
+ return ret;
+}
+#endif
+
/*---------------------------------- IOCTL ----------------------------------*/

static int bond_sethwaddr(struct net_device *bond_dev,
@@ -1741,6 +1833,18 @@ int bond_enslave(struct net_device *bond
new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
new_slave->link != BOND_LINK_DOWN ? "n up" : " down");

+#ifdef CONFIG_NET_POLL_CONTROLLER
+ if (slaves_support_netpoll(bond_dev)) {
+ bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
+ if (bond_dev->npinfo)
+ slave_dev->npinfo = bond_dev->npinfo;
+ } else if (!(bond_dev->priv_flags & IFF_DISABLE_NETPOLL)) {
+ bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
+ pr_info("New slave device %s does not support netpoll\n",
+ slave_dev->name);
+ pr_info("Disabling netpoll support for %s\n", bond_dev->name);
+ }
+#endif
/* enslave is successful */
return 0;

@@ -1924,6 +2028,15 @@ int bond_release(struct net_device *bond

netdev_set_master(slave_dev, NULL);

+#ifdef CONFIG_NET_POLL_CONTROLLER
+ if (slaves_support_netpoll(bond_dev))
+ bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
+ if (slave_dev->netdev_ops->ndo_netpoll_cleanup)
+ slave_dev->netdev_ops->ndo_netpoll_cleanup(slave_dev);
+ else
+ slave_dev->npinfo = NULL;
+#endif
+
/* close slave before restoring its mac address */
dev_close(slave_dev);

@@ -2032,6 +2145,9 @@ static int bond_release_all(struct net_d

netdev_set_master(slave_dev, NULL);

+#ifdef CONFIG_NET_POLL_CONTROLLER
+ slave_dev->npinfo = NULL;
+#endif
/* close slave before restoring its mac address */
dev_close(slave_dev);

@@ -4424,6 +4540,12 @@ static const struct net_device_ops bond_
.ndo_vlan_rx_register = bond_vlan_rx_register,
.ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
.ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_netpoll_setup = bond_netpoll_setup,
+ .ndo_netpoll_xmit = bond_netpoll_xmit,
+ .ndo_netpoll_cleanup = bond_netpoll_cleanup,
+ .ndo_poll_controller = bond_poll_controller,
+#endif
};

static void bond_setup(struct net_device *bond_dev)
--
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Prev: [tip:core/urgent] softlockup: Stop spurious softlockup messages due to overflow
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