From: Wei Liu <wei.liu2@citrix.com>
Date: Wed, 22 May 2013 06:34:45 +0000 (+0000)
Subject: xen-netback: split event channels support for Xen backend driver
X-Git-Tag: v3.11-rc1~16^2~328^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e1f00a69ec26e3eb9847c61c665b8fb3f0c6b477;p=pandora-kernel.git

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: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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