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virtio_net: clarify tailroom logic

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Make tailroom math follow same logic as everything else, subtracing
values in the order in which things are laid out in the buffer.

Tested-by: Corentin Noël <corentin.noel@collabora.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2021-10-09 10:52:50 -04:00
parent 8bb7eca972
commit fc02e8cb03
1 changed files with 2 additions and 1 deletions
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3
drivers/net/virtio_net.c
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@ -406,12 +406,13 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
* add_recvbuf_mergeable() + get_mergeable_buf_len()
*/
truesize = headroom ? PAGE_SIZE : truesize;
tailroom = truesize - len - headroom - (hdr_padded_len - hdr_len);
tailroom = truesize - headroom;
buf = p - headroom;
len -= hdr_len;
offset += hdr_padded_len;
p += hdr_padded_len;
tailroom -= hdr_padded_len + len;
shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));