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/net/xen-netfront.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers/net/xen-netfront.c') diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index e9b960f0ff32..13f5e7ff4bb5 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -1486,6 +1486,7 @@ static int setup_netfront(struct xenbus_device *dev, { struct xen_netif_tx_sring *txs; struct xen_netif_rx_sring *rxs; + grant_ref_t gref; int err; queue->tx_ring_ref = GRANT_INVALID_REF; @@ -1502,10 +1503,10 @@ static int setup_netfront(struct xenbus_device *dev, SHARED_RING_INIT(txs); FRONT_RING_INIT(&queue->tx, txs, PAGE_SIZE); - err = xenbus_grant_ring(dev, virt_to_mfn(txs)); + err = xenbus_grant_ring(dev, txs, 1, &gref); if (err < 0) goto grant_tx_ring_fail; - queue->tx_ring_ref = err; + queue->tx_ring_ref = gref; rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); if (!rxs) { @@ -1516,10 +1517,10 @@ static int setup_netfront(struct xenbus_device *dev, SHARED_RING_INIT(rxs); FRONT_RING_INIT(&queue->rx, rxs, PAGE_SIZE); - err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); + err = xenbus_grant_ring(dev, rxs, 1, &gref); if (err < 0) goto grant_rx_ring_fail; - queue->rx_ring_ref = err; + queue->rx_ring_ref = gref; if (feature_split_evtchn) err = setup_netfront_split(queue); -- cgit v1.2.3