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>

1 files changed, 59 insertions, 0 deletions

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 82599405dc15..074c59690fc5 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -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)