[PATCH 3.16 131/157] vhost_net: introduce vhost_exceeds_weight()

[Ben Hutchings]

3.16.72-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Wang <jasow...@redhat.com>

commit 272f35cba53d088085e5952fd81d7a133ab90789 upstream.

Signed-off-by: Jason Wang <jasow...@redhat.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -335,6 +335,12 @@ static void vhost_zerocopy_callback(stru
        rcu_read_unlock_bh();
 }
 
+static bool vhost_exceeds_weight(int pkts, int total_len)
+{
+       return total_len >= VHOST_NET_WEIGHT ||
+              pkts >= VHOST_NET_PKT_WEIGHT;
+}
+
 /* 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)
@@ -457,8 +463,7 @@ static void handle_tx(struct vhost_net *
                        vhost_zerocopy_signal_used(net, vq);
                total_len += len;
                vhost_net_tx_packet(net);
-               if (unlikely(total_len >= VHOST_NET_WEIGHT) ||
-                   unlikely(++sent_pkts >= VHOST_NET_PKT_WEIGHT)) {
+               if (unlikely(vhost_exceeds_weight(++sent_pkts, total_len))) {
                        vhost_poll_queue(&vq->poll);
                        break;
                }
@@ -668,8 +673,7 @@ static void handle_rx(struct vhost_net *
                if (unlikely(vq_log))
                        vhost_log_write(vq, vq_log, log, vhost_len);
                total_len += vhost_len;
-               if (unlikely(total_len >= VHOST_NET_WEIGHT) ||
-                   unlikely(++recv_pkts >= VHOST_NET_PKT_WEIGHT)) {
+               if (unlikely(vhost_exceeds_weight(++recv_pkts, total_len))) {
                        vhost_poll_queue(&vq->poll);
                        break;
                }