linux-kernel - [PATCH 4.14 43/56] vhost_net: introduce vhost_exceeds

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Date:   Mon,  8 Jul 2019 17:13:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Balbir Singh <sblbir@...n.com>
Subject: [PATCH 4.14 43/56] vhost_net: introduce vhost_exceeds_weight()

From: Jason Wang <jasowang@...hat.com>

commit 272f35cba53d088085e5952fd81d7a133ab90789 upstream.

Signed-off-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Balbir Singh <sblbir@...n.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/vhost/net.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -446,6 +446,12 @@ static bool vhost_exceeds_maxpend(struct
 		== nvq->done_idx;
 }
 
+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)
@@ -550,7 +556,6 @@ static void handle_tx(struct vhost_net *
 			msg.msg_control = NULL;
 			ubufs = NULL;
 		}
-
 		total_len += len;
 		if (total_len < VHOST_NET_WEIGHT &&
 		    !vhost_vq_avail_empty(&net->dev, vq) &&
@@ -579,8 +584,7 @@ static void handle_tx(struct vhost_net *
 		else
 			vhost_zerocopy_signal_used(net, vq);
 		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;
 		}
@@ -863,8 +867,7 @@ static void handle_rx(struct vhost_net *
 			vhost_log_write(vq, vq_log, log, vhost_len,
 					vq->iov, in);
 		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);
 			goto out;
 		}