[PATCH] vhost-net: add time limitation for tx polling

[张海斌]

handle_tx() will delay rx for a long time when busy tx polling udp packets
with short length(ie: 1byte udp payload), because setting VHOST_NET_WEIGHT
takes into account only sent-bytes but no time. It's not fair for handle_rx(),
so needs to limit max time of tx polling.

Signed-off-by: Haibin Zhang <haibinzh...@tencent.com>
---
 drivers/vhost/net.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 8139bc70ad7d..dc9218a3a75b 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -473,6 +473,7 @@ static void handle_tx(struct vhost_net *net)
        struct socket *sock;
        struct vhost_net_ubuf_ref *uninitialized_var(ubufs);
        bool zcopy, zcopy_used;
+       unsigned long start = jiffies;
 
        mutex_lock(&vq->mutex);
        sock = vq->private_data;
@@ -580,7 +581,7 @@ static void handle_tx(struct vhost_net *net)
                else
                        vhost_zerocopy_signal_used(net, vq);
                vhost_net_tx_packet(net);
-               if (unlikely(total_len >= VHOST_NET_WEIGHT)) {
+               if (unlikely(total_len >= VHOST_NET_WEIGHT) || unlikely(jiffies 
- start >= 1)) {
                        vhost_poll_queue(&vq->poll);
                        break;
                }
-- 
2.12.3