From ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d Mon Sep 17 00:00:00 2001 From: Wei Liu Date: Fri, 3 Apr 2015 14:44:59 +0800 Subject: xenbus_client: Extend interface to support multi-page ring 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 Signed-off-by: Paul Durrant Signed-off-by: Bob Liu Cc: Konrad Wilk Cc: Boris Ostrovsky Signed-off-by: David Vrabel --- drivers/block/xen-blkback/xenbus.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/block/xen-blkback') diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index e3afe97280b1..ff3025922c14 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -193,7 +193,7 @@ fail: return ERR_PTR(-ENOMEM); } -static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page, +static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t gref, unsigned int evtchn) { int err; @@ -202,7 +202,8 @@ static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page, if (blkif->irq) return 0; - err = xenbus_map_ring_valloc(blkif->be->dev, shared_page, &blkif->blk_ring); + err = xenbus_map_ring_valloc(blkif->be->dev, &gref, 1, + &blkif->blk_ring); if (err < 0) return err; -- cgit v1.2.3