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virtio-net: realign page_to_skb() after merges

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We ended up merging two versions of the same patch set:

commit 8fb7da9e99 ("virtio_net: get build_skb() buf by data ptr")
commit 5c37711d9f ("virtio-net: fix for unable to handle page fault for address")

into net, and

commit 7bf64460e3 ("virtio-net: get build_skb() buf by data ptr")
commit 6c66c147b9 ("virtio-net: fix for unable to handle page fault for address")

into net-next. Redo the merge from commit 126285651b ("Merge
ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net"), so that
the most recent code remains.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2021-08-02 10:57:29 -07:00 committed by David S. Miller
parent dc1a8079eb
commit c32325b8fd
1 changed files with 8 additions and 19 deletions
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27
drivers/net/virtio_net.c
View File

@ -380,7 +380,7 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
struct page *page, unsigned int offset, struct page *page, unsigned int offset,
unsigned int len, unsigned int truesize, unsigned int len, unsigned int truesize,
bool hdr_valid, unsigned int metasize, bool hdr_valid, unsigned int metasize,
bool whole_page) unsigned int headroom)
{ {
struct sk_buff *skb; struct sk_buff *skb;
struct virtio_net_hdr_mrg_rxbuf *hdr; struct virtio_net_hdr_mrg_rxbuf *hdr;
@ -398,28 +398,16 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
else else
hdr_padded_len = sizeof(struct padded_vnet_hdr); hdr_padded_len = sizeof(struct padded_vnet_hdr);
/* If whole_page, there is an offset between the beginning of the /* If headroom is not 0, there is an offset between the beginning of the
* data and the allocated space, otherwise the data and the allocated * data and the allocated space, otherwise the data and the allocated
* space are aligned. * space are aligned.
* *
* Buffers with headroom use PAGE_SIZE as alloc size, see * Buffers with headroom use PAGE_SIZE as alloc size, see
* add_recvbuf_mergeable() + get_mergeable_buf_len() * add_recvbuf_mergeable() + get_mergeable_buf_len()
*/ */
if (whole_page) { truesize = headroom ? PAGE_SIZE : truesize;
/* Buffers with whole_page use PAGE_SIZE as alloc size, tailroom = truesize - len - headroom;
* see add_recvbuf_mergeable() + get_mergeable_buf_len() buf = p - headroom;
*/
truesize = PAGE_SIZE;
/* page maybe head page, so we should get the buf by p, not the
* page
*/
tailroom = truesize - len - offset_in_page(p);
buf = (char *)((unsigned long)p & PAGE_MASK);
} else {
tailroom = truesize - len;
buf = p;
}
len -= hdr_len; len -= hdr_len;
offset += hdr_padded_len; offset += hdr_padded_len;
@ -978,7 +966,8 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
put_page(page); put_page(page);
head_skb = page_to_skb(vi, rq, xdp_page, offset, head_skb = page_to_skb(vi, rq, xdp_page, offset,
len, PAGE_SIZE, false, len, PAGE_SIZE, false,
metasize, true); metasize,
VIRTIO_XDP_HEADROOM);
return head_skb; return head_skb;
} }
break; break;
@ -1029,7 +1018,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
rcu_read_unlock(); rcu_read_unlock();
head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog, head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog,
metasize, !!headroom); metasize, headroom);
curr_skb = head_skb; curr_skb = head_skb;
if (unlikely(!curr_skb)) if (unlikely(!curr_skb))