From: Jason Wang <jasowang@redhat.com>
Date: Fri, 20 Jul 2018 08:15:17 +0800
Subject: vhost_net: introduce tx_can_batch()
Patch-mainline: v4.19-rc1
Git-commit: c92a8a8cb7d499a352ebb625667a780bfc99ba77
References: bsc#1109837
Introduce tx_can_batch() to determine whether TX could be
batched. This will help to reduce the code duplication in the future.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/vhost/net.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -512,6 +512,12 @@ static int get_tx_bufs(struct vhost_net
return ret;
}
+static bool tx_can_batch(struct vhost_virtqueue *vq, size_t total_len)
+{
+ return total_len < VHOST_NET_WEIGHT &&
+ !vhost_vq_avail_empty(vq->dev, vq);
+}
+
/* Expects to be always run from workqueue - which acts as
* read-size critical section for our kind of RCU. */
static void handle_tx(struct vhost_net *net)
@@ -595,8 +601,7 @@ static void handle_tx(struct vhost_net *
ubufs = NULL;
}
total_len += len;
- if (total_len < VHOST_NET_WEIGHT &&
- !vhost_vq_avail_empty(&net->dev, vq) &&
+ if (tx_can_batch(vq, total_len) &&
likely(!vhost_exceeds_maxpend(net))) {
msg.msg_flags |= MSG_MORE;
} else {