xen-netback: split event channels support for Xen backend driver
Netback and netfront only use one event channel to do TX / RX notification, which may cause unnecessary wake-up of processing routines. This patch adds a new feature called feature-split-event-channels to netback, enabling it to handle TX and RX events separately. Netback will use tx_irq to notify guest for TX completion, rx_irq for RX notification. If frontend doesn't support this feature, tx_irq equals to rx_irq. Signed-off-by: NWei Liu <wei.liu2@citrix.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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