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https://github.com/openvswitch/ovs
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572e54faff
Red Hat Enterprise Linux 6 has backported the netdev RX handler facility so use the netdev_rx_handler_register as an indicator. The handler prototype changed between 2.6.36 and 2.6.39 since there could be backports in any stage, don't look at the kernel version, but at the prototype. Signed-off-by: Flavio Leitner <fbl@redhat.com> Signed-off-by: Jesse Gross <jesse@nicira.com>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
#include <linux/if_bridge.h>
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#include <linux/netdevice.h>
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#include <linux/version.h>
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#ifndef HAVE_DEV_DISABLE_LRO
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#ifdef NETIF_F_LRO
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#include <linux/ethtool.h>
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/**
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* dev_disable_lro - disable Large Receive Offload on a device
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* @dev: device
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*
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* Disable Large Receive Offload (LRO) on a net device. Must be
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* called under RTNL. This is needed if received packets may be
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* forwarded to another interface.
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*/
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void dev_disable_lro(struct net_device *dev)
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{
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if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
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dev->ethtool_ops->set_flags) {
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u32 flags = dev->ethtool_ops->get_flags(dev);
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if (flags & ETH_FLAG_LRO) {
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flags &= ~ETH_FLAG_LRO;
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dev->ethtool_ops->set_flags(dev, flags);
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}
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}
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WARN_ON(dev->features & NETIF_F_LRO);
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}
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#else
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void dev_disable_lro(struct net_device *dev) { }
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#endif /* NETIF_F_LRO */
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#endif /* HAVE_DEV_DISABLE_LRO */
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#if !defined HAVE_NETDEV_RX_HANDLER_REGISTER || \
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defined HAVE_RHEL_OVS_HOOK
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static int nr_bridges;
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#ifdef HAVE_RHEL_OVS_HOOK
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int rpl_netdev_rx_handler_register(struct net_device *dev,
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openvswitch_handle_frame_hook_t *hook,
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void *rx_handler_data)
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{
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nr_bridges++;
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rcu_assign_pointer(dev->ax25_ptr, rx_handler_data);
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if (nr_bridges == 1)
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rcu_assign_pointer(openvswitch_handle_frame_hook, hook);
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return 0;
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}
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EXPORT_SYMBOL_GPL(rpl_netdev_rx_handler_register);
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#else
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int rpl_netdev_rx_handler_register(struct net_device *dev,
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struct sk_buff *(*hook)(struct net_bridge_port *p,
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struct sk_buff *skb),
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void *rx_handler_data)
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{
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nr_bridges++;
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if (dev->br_port)
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return -EBUSY;
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rcu_assign_pointer(dev->br_port, rx_handler_data);
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if (nr_bridges == 1)
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br_handle_frame_hook = hook;
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return 0;
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}
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EXPORT_SYMBOL_GPL(rpl_netdev_rx_handler_register);
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#endif
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void rpl_netdev_rx_handler_unregister(struct net_device *dev)
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{
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nr_bridges--;
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#ifdef HAVE_RHEL_OVS_HOOK
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rcu_assign_pointer(dev->ax25_ptr, NULL);
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if (nr_bridges)
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return;
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rcu_assign_pointer(openvswitch_handle_frame_hook, NULL);
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#else
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rcu_assign_pointer(dev->br_port, NULL);
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if (nr_bridges)
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return;
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br_handle_frame_hook = NULL;
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#endif
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}
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EXPORT_SYMBOL_GPL(rpl_netdev_rx_handler_unregister);
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#endif
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