xen/blkfront: negotiate number of queues/rings to be used with backend

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The max number of hardware queues for xen/blkfront is set by parameter
'max_queues'(default 4), while it is also capped by the max value that the
xen/blkback exposes through XenStore key 'multi-queue-max-queues'.

The negotiated number is the smaller one and would be written back to xenstore
as "multi-queue-num-queues", blkback needs to read this negotiated number.

Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

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Bob Liu 2015-11-14 11:12:14 +08:00 • committed by Konrad Rzeszutek Wilk

parent 11659569f7

commit 28d949bcc2

1 changed files with 119 additions and 41 deletions

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drivers/block/xen-blkfront.c

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