netdev - [PATCH net-next 4/6] virtio_net: Factor out the logic to determine xdp sq

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Date:   Mon, 23 Jul 2018 23:36:07 +0900
From:   Toshiaki Makita <toshiaki.makita1@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: [PATCH net-next 4/6] virtio_net: Factor out the logic to determine xdp sq

From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>

Make sure to use the same logic in all places to determine xdp sq. This
is useful for xdp counters which the following commit will introduce as
well.

Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
---
 drivers/net/virtio_net.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7a47ce750a43..eca9b13b859e 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -457,16 +457,22 @@ static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
 	return 0;
 }
 
+static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi)
+{
+	unsigned int qp;
+
+	qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
+	return &vi->sq[qp];
+}
+
 static int __virtnet_xdp_tx_xmit(struct virtnet_info *vi,
 				   struct xdp_frame *xdpf)
 {
 	struct xdp_frame *xdpf_sent;
 	struct send_queue *sq;
 	unsigned int len;
-	unsigned int qp;
 
-	qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
-	sq = &vi->sq[qp];
+	sq = virtnet_xdp_sq(vi);
 
 	/* Free up any pending old buffers before queueing new ones. */
 	while ((xdpf_sent = virtqueue_get_buf(sq->vq, &len)) != NULL)
@@ -484,7 +490,6 @@ static int virtnet_xdp_xmit(struct net_device *dev,
 	struct bpf_prog *xdp_prog;
 	struct send_queue *sq;
 	unsigned int len;
-	unsigned int qp;
 	int drops = 0;
 	int err;
 	int i;
@@ -492,8 +497,7 @@ static int virtnet_xdp_xmit(struct net_device *dev,
 	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
 		return -EINVAL;
 
-	qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
-	sq = &vi->sq[qp];
+	sq = virtnet_xdp_sq(vi);
 
 	/* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
 	 * indicate XDP resources have been successfully allocated.
@@ -1349,7 +1353,7 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
 		container_of(napi, struct receive_queue, napi);
 	struct virtnet_info *vi = rq->vq->vdev->priv;
 	struct send_queue *sq;
-	unsigned int received, qp;
+	unsigned int received;
 	unsigned int xdp_xmit = 0;
 
 	virtnet_poll_cleantx(rq);
@@ -1364,9 +1368,7 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
 		xdp_do_flush_map();
 
 	if (xdp_xmit & VIRTIO_XDP_TX) {
-		qp = vi->curr_queue_pairs - vi->xdp_queue_pairs +
-		     smp_processor_id();
-		sq = &vi->sq[qp];
+		sq = virtnet_xdp_sq(vi);
 		virtqueue_kick(sq->vq);
 	}
 
-- 
2.14.3