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authorTom Herbert <tom@herbertland.com>2016-03-07 14:11:04 -0800
committerDavid S. Miller <davem@davemloft.net>2016-03-09 16:36:14 -0500
commitfa9835e52e3ea946916c2ce6c625c86421131740 (patch)
tree3af9cba3d0fe3b51b0f065d6b5f50332dd5a2e92 /net/core
parentf092276d85b82504e8a07498f4e9e0c51f06745c (diff)
downloadop-kernel-dev-fa9835e52e3ea946916c2ce6c625c86421131740.zip
op-kernel-dev-fa9835e52e3ea946916c2ce6c625c86421131740.tar.gz
net: Walk fragments in __skb_splice_bits
Add walking of fragments in __skb_splice_bits. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/skbuff.c39
1 files changed, 16 insertions, 23 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 9d7be61..51d768e 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1918,6 +1918,7 @@ static bool __skb_splice_bits(struct sk_buff *skb, struct pipe_inode_info *pipe,
struct splice_pipe_desc *spd, struct sock *sk)
{
int seg;
+ struct sk_buff *iter;
/* map the linear part :
* If skb->head_frag is set, this 'linear' part is backed by a
@@ -1944,6 +1945,19 @@ static bool __skb_splice_bits(struct sk_buff *skb, struct pipe_inode_info *pipe,
return true;
}
+ skb_walk_frags(skb, iter) {
+ if (*offset >= iter->len) {
+ *offset -= iter->len;
+ continue;
+ }
+ /* __skb_splice_bits() only fails if the output has no room
+ * left, so no point in going over the frag_list for the error
+ * case.
+ */
+ if (__skb_splice_bits(iter, pipe, offset, len, spd, sk))
+ return true;
+ }
+
return false;
}
@@ -1970,9 +1984,7 @@ ssize_t skb_socket_splice(struct sock *sk,
/*
* Map data from the skb to a pipe. Should handle both the linear part,
- * the fragments, and the frag list. It does NOT handle frag lists within
- * the frag list, if such a thing exists. We'd probably need to recurse to
- * handle that cleanly.
+ * the fragments, and the frag list.
*/
int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset,
struct pipe_inode_info *pipe, unsigned int tlen,
@@ -1991,29 +2003,10 @@ int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset,
.ops = &nosteal_pipe_buf_ops,
.spd_release = sock_spd_release,
};
- struct sk_buff *frag_iter;
int ret = 0;
- /*
- * __skb_splice_bits() only fails if the output has no room left,
- * so no point in going over the frag_list for the error case.
- */
- if (__skb_splice_bits(skb, pipe, &offset, &tlen, &spd, sk))
- goto done;
- else if (!tlen)
- goto done;
+ __skb_splice_bits(skb, pipe, &offset, &tlen, &spd, sk);
- /*
- * now see if we have a frag_list to map
- */
- skb_walk_frags(skb, frag_iter) {
- if (!tlen)
- break;
- if (__skb_splice_bits(frag_iter, pipe, &offset, &tlen, &spd, sk))
- break;
- }
-
-done:
if (spd.nr_pages)
ret = splice_cb(sk, pipe, &spd);
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