net: move zerocopy_sg_from_iovec() to net/core/datagram.c

To let it be reused and reduce code duplication. Also document this function.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index ae46475d4568..5ac96f31d546 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2359,6 +2359,10 @@ extern int	       skb_copy_datagram_from_iovec(struct sk_buff *skb,
                                                     const struct iovec *from,
                                                     int from_offset,
                                                     int len);
+extern int             zerocopy_sg_from_iovec(struct sk_buff *skb,
+                                              const struct iovec *frm,
+                                              int offset,
+                                              size_t count);
 extern int             skb_copy_datagram_const_iovec(const struct sk_buff *from,
                                                      int offset,
                                                      const struct iovec *to,