netdev - [net PATCH v4 4/6] virtio_net: remove duplicate queue pair binding in XDP

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Date:   Sun, 15 Jan 2017 16:00:46 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     jasowang@...hat.com, mst@...hat.com
Cc:     john.r.fastabend@...el.com, netdev@...r.kernel.org,
        john.fastabend@...il.com, alexei.starovoitov@...il.com,
        daniel@...earbox.net
Subject: [net PATCH v4 4/6] virtio_net: remove duplicate queue pair binding
 in XDP

Factor out qp assignment.

Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
---
 drivers/net/virtio_net.c |   18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7dda206..ac853b9 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -332,15 +332,19 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 
 static void virtnet_xdp_xmit(struct virtnet_info *vi,
 			     struct receive_queue *rq,
-			     struct send_queue *sq,
 			     struct xdp_buff *xdp,
 			     void *data)
 {
 	struct virtio_net_hdr_mrg_rxbuf *hdr;
 	unsigned int num_sg, len;
+	struct send_queue *sq;
+	unsigned int qp;
 	void *xdp_sent;
 	int err;
 
+	qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
+	sq = &vi->sq[qp];
+
 	/* Free up any pending old buffers before queueing new ones. */
 	while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) {
 		if (vi->mergeable_rx_bufs) {
@@ -404,7 +408,6 @@ static struct sk_buff *receive_small(struct net_device *dev,
 	if (xdp_prog) {
 		struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
 		struct xdp_buff xdp;
-		unsigned int qp;
 		u32 act;
 
 		if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags))
@@ -417,10 +420,7 @@ static struct sk_buff *receive_small(struct net_device *dev,
 		case XDP_PASS:
 			break;
 		case XDP_TX:
-			qp = vi->curr_queue_pairs -
-				vi->xdp_queue_pairs +
-				smp_processor_id();
-			virtnet_xdp_xmit(vi, rq, &vi->sq[qp], &xdp, skb);
+			virtnet_xdp_xmit(vi, rq, &xdp, skb);
 			rcu_read_unlock();
 			goto xdp_xmit;
 		default:
@@ -545,7 +545,6 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 	if (xdp_prog) {
 		struct page *xdp_page;
 		struct xdp_buff xdp;
-		unsigned int qp;
 		void *data;
 		u32 act;
 
@@ -586,10 +585,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 			}
 			break;
 		case XDP_TX:
-			qp = vi->curr_queue_pairs -
-				vi->xdp_queue_pairs +
-				smp_processor_id();
-			virtnet_xdp_xmit(vi, rq, &vi->sq[qp], &xdp, data);
+			virtnet_xdp_xmit(vi, rq, &xdp, data);
 			ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len);
 			if (unlikely(xdp_page != page))
 				goto err_xdp;