Commit fc02e8cb authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

virtio_net: clarify tailroom logic 



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: default avatarCorentin Noël <corentin.noel@collabora.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 8bb7eca9

drivers/net/virtio_net.c

+2 −1
Original line number Diff line number Diff line
@@ -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));