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xenbus_client: Extend interface to support multi-page ring

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Originally Xen PV drivers only use single-page ring to pass along
information. This might limit the throughput between frontend and
backend.

The patch extends Xenbus driver to support multi-page ring, which in
general should improve throughput if ring is the bottleneck. Changes to
various frontend / backend to adapt to the new interface are also
included.

Affected Xen drivers:
* blkfront/back
* netfront/back
* pcifront/back
* scsifront/back
* vtpmfront

The interface is documented, as before, in xenbus_client.c.

Signed-off-by: Wei Liu <[email protected]>
Signed-off-by: Paul Durrant <[email protected]>
Signed-off-by: Bob Liu <[email protected]>
Cc: Konrad Wilk <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Signed-off-by: David Vrabel <[email protected]>
This commit is contained in:
Wei Liu 2015-04-03 14:44:59 +08:00 • committed by David Vrabel
commit ccc9d90a9a
11 changed files with 324 additions and 125 deletions
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5
drivers/scsi/xen-scsifront.c
View file

@ -714,6 +714,7 @@ static int scsifront_alloc_ring(struct vscsifrnt_info *info)
{
struct xenbus_device *dev = info->dev;
struct vscsiif_sring *sring;
grant_ref_t gref;
int err = -ENOMEM;
/***** Frontend to Backend ring start *****/
@ -726,14 +727,14 @@ static int scsifront_alloc_ring(struct vscsifrnt_info *info)
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
err = xenbus_grant_ring(dev, virt_to_mfn(sring));
err = xenbus_grant_ring(dev, sring, 1, &gref);
if (err < 0) {
free_page((unsigned long)sring);
xenbus_dev_fatal(dev, err,
"fail to grant shared ring (Front to Back)");
return err;
}
info->ring_ref = err;
info->ring_ref = gref;
err = xenbus_alloc_evtchn(dev, &info->evtchn);
if (err) {