linux-kernel - [V2 PATCH 8/9] vhost_net: zerocopy: adding and signalling immediately when fully copied

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Message-ID: <20120502034241.11782.9650.stgit@amd-6168-8-1.englab.nay.redhat.com>
Date:	Wed, 02 May 2012 11:42:41 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	eric.dumazet@...il.com, mst@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	davem@...emloft.net
Subject: [V2 PATCH 8/9] vhost_net: zerocopy: adding and signalling
 immediately when fully copied

When a packet were fully copied in zerocopy, we don't wait for the DMA done to
mark the done flag, so after the packet were passed to lower device, we need to
add used and signal guest immediately.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vhost/net.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 62828aa..1dc2aeb 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -266,6 +266,8 @@ static void handle_tx(struct vhost_net *net)
 				 " len %d != %zd\n", err, len);
 		if (!zcopy)
 			vhost_add_used_and_signal(&net->dev, vq, head, 0);
+		else
+			vhost_zerocopy_signal_used(vq);
 		total_len += len;
 		if (unlikely(total_len >= VHOST_NET_WEIGHT)) {
 			vhost_poll_queue(&vq->poll);

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