virtio-net: remove unused skb_vnet_hdr->num_sg field

[~andy/linux] / drivers / net / virtio_net.c

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index cbf8b06253528e9e5557c31e844581d7334d7e21..6c094c88424efc7260a9dfc5e0ed522784a8f848 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -95,7 +95,6 @@ struct skb_vnet_hdr {
                struct virtio_net_hdr hdr;
                struct virtio_net_hdr_mrg_rxbuf mhdr;
        };
-       unsigned int num_sg;
 };
 
 struct padded_vnet_hdr {
@@ -557,10 +556,10 @@ again:
        return received;
 }
 
-static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
+static void free_old_xmit_skbs(struct virtnet_info *vi)
 {
        struct sk_buff *skb;
-       unsigned int len, tot_sgs = 0;
+       unsigned int len;
        struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
 
        while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
@@ -571,16 +570,15 @@ static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
                stats->tx_packets++;
                u64_stats_update_end(&stats->tx_syncp);
 
-               tot_sgs += skb_vnet_hdr(skb)->num_sg;
                dev_kfree_skb_any(skb);
        }
-       return tot_sgs;
 }
 
 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
 {
        struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
        const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
+       unsigned num_sg;
 
        pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
 
@@ -619,8 +617,8 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
        else
                sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
 
-       hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
-       return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
+       num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
+       return virtqueue_add_buf(vi->svq, vi->tx_sg, num_sg,
                                 0, skb, GFP_ATOMIC);
 }
 
@@ -664,7 +662,8 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
                netif_stop_queue(dev);
                if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
                        /* More just got used, free them then recheck. */
-                       capacity += free_old_xmit_skbs(vi);
+                       free_old_xmit_skbs(vi);
+                       capacity = vi->svq->num_free;
                        if (capacity >= 2+MAX_SKB_FRAGS) {
                                netif_start_queue(dev);
                                virtqueue_disable_cb(vi->svq);