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xen: netif.h: document feature-split-event-channels 

This patch synchronises documentation for feature-split-event-channels from
Xen canonical header file.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Liu 2013-05-22 06:34:47 +00:00 committed by David S. Miller
parent d634bf2cb9
commit a5560a6c17
1 changed files with 12 additions and 0 deletions
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12
include/xen/interface/io/netif.h
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@ -38,6 +38,18 @@
* that it cannot safely queue packets (as it may not be kicked to send them).
*/
/*
* "feature-split-event-channels" is introduced to separate guest TX
* and RX notificaion. Backend either doesn't support this feature or
* advertise it via xenstore as 0 (disabled) or 1 (enabled).
*
* To make use of this feature, frontend should allocate two event
* channels for TX and RX, advertise them to backend as
* "event-channel-tx" and "event-channel-rx" respectively. If frontend
* doesn't want to use this feature, it just writes "event-channel"
* node as before.
*/
/*
* This is the 'wire' format for packets:
* Request 1: xen_netif_tx_request -- XEN_NETTXF_* (any flags)