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virtio_net: small: avoid code duplication in xdp scenarios

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Avoid the problem that some variables(headroom and so on) will repeat
the calculation when process xdp.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xuan Zhuo
2023-05-08 14:14:14 +08:00
committed by Jakub Kicinski
parent fc8ce84b09
commit 7af70fc169
1 changed files with 8 additions and 4 deletions
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12
drivers/net/virtio_net.c
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@@ -1031,11 +1031,10 @@ static struct sk_buff *receive_small(struct net_device *dev,
struct sk_buff *skb;
struct bpf_prog *xdp_prog;
unsigned int xdp_headroom = (unsigned long)ctx;
unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
unsigned int headroom = vi->hdr_len + header_offset;
unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
struct page *page = virt_to_head_page(buf);
unsigned int header_offset;
unsigned int headroom;
unsigned int buflen;
len -= vi->hdr_len;
stats->bytes += len;
@@ -1063,6 +1062,11 @@ static struct sk_buff *receive_small(struct net_device *dev,
rcu_read_unlock();
skip_xdp:
header_offset = VIRTNET_RX_PAD + xdp_headroom;
headroom = vi->hdr_len + header_offset;
buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
skb = build_skb(buf, buflen);
if (!skb)
goto err;