xen/blkfront: pseudo support for multi hardware queues/rings

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Preparatory patch for multiple hardware queues (rings). The number of
rings is unconditionally set to 1, larger number will be enabled in
patch "xen/blkfront: negotiate number of queues/rings to be used with backend"
so as to make review easier.

Note that blkfront_gather_backend_features does not call
blkfront_setup_indirect anymore (as that needs to be done per ring).
That means that in blkif_recover/blkif_connect we have to do it in a loop
(bounded by nr_rings).

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 11:12:12 +08:00 • committed by Konrad Rzeszutek Wilk

parent 81f3516157

commit 3df0e50599

1 changed files with 198 additions and 145 deletions

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drivers/block/xen-blkfront.c

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