renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-20 11:13:58 +08:00
Code

net: Kill skb_copy_datagram_const_iovec

Browse Source 
Now that both macvtap and tun are using skb_copy_datagram_iter, we
can kill the abomination that is skb_copy_datagram_const_iovec.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2014-11-07 21:22:26 +08:00 committed by David S. Miller
parent 6c36d2e26c
commit bfe1be38fc
2 changed files with 0 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/skbuff.h
View File

@ -2651,9 +2651,6 @@ int skb_copy_datagram_from_iovec(struct sk_buff *skb, int offset,
int len);
int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *frm,
int offset, size_t count);
int skb_copy_datagram_const_iovec(const struct sk_buff *from, int offset,
const struct iovec *to, int to_offset,
int size);
int skb_copy_datagram_iter(const struct sk_buff *from, int offset,
struct iov_iter *to, int size);
void skb_free_datagram(struct sock *sk, struct sk_buff *skb);

89
net/core/datagram.c
View File

@ -393,95 +393,6 @@ fault:
}
EXPORT_SYMBOL(skb_copy_datagram_iovec);
/**
* skb_copy_datagram_const_iovec - Copy a datagram to an iovec.
* @skb: buffer to copy
* @offset: offset in the buffer to start copying from
* @to: io vector to copy to
* @to_offset: offset in the io vector to start copying to
* @len: amount of data to copy from buffer to iovec
*
* Returns 0 or -EFAULT.
* Note: the iovec is not modified during the copy.
*/
int skb_copy_datagram_const_iovec(const struct sk_buff *skb, int offset,
const struct iovec *to, int to_offset,
int len)
{
int start = skb_headlen(skb);
int i, copy = start - offset;
struct sk_buff *frag_iter;
/* Copy header. */
if (copy > 0) {
if (copy > len)
copy = len;
if (memcpy_toiovecend(to, skb->data + offset, to_offset, copy))
goto fault;
if ((len -= copy) == 0)
return 0;
offset += copy;
to_offset += copy;
}
/* Copy paged appendix. Hmm... why does this look so complicated? */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
WARN_ON(start > offset + len);
end = start + skb_frag_size(frag);
if ((copy = end - offset) > 0) {
int err;
u8 *vaddr;
struct page *page = skb_frag_page(frag);
if (copy > len)
copy = len;
vaddr = kmap(page);
err = memcpy_toiovecend(to, vaddr + frag->page_offset +
offset - start, to_offset, copy);
kunmap(page);
if (err)
goto fault;
if (!(len -= copy))
return 0;
offset += copy;
to_offset += copy;
}
start = end;
}
skb_walk_frags(skb, frag_iter) {
int end;
WARN_ON(start > offset + len);
end = start + frag_iter->len;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
if (skb_copy_datagram_const_iovec(frag_iter,
offset - start,
to, to_offset,
copy))
goto fault;
if ((len -= copy) == 0)
return 0;
offset += copy;
to_offset += copy;
}
start = end;
}
if (!len)
return 0;
fault:
return -EFAULT;
}
EXPORT_SYMBOL(skb_copy_datagram_const_iovec);
/**
* skb_copy_datagram_iter - Copy a datagram to an iovec iterator.
* @skb: buffer to copy