[PATCH v3 02/13] datagram: open-code copy_page_to_iter
From: Sagi Grimberg <sagi@grimberg.me>
Date: 2018-11-22 01:57:00
Also in:
linux-nvme, netdev
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Sagi Grimberg <redacted> This will be useful to consolidate skb_copy_and_hash_datagram_iter and skb_copy_and_csum_datagram to a single code path. Signed-off-by: Sagi Grimberg <redacted> --- net/core/datagram.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 57f3a6fcfc1e..abe642181b64 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c@@ -445,11 +445,14 @@ int skb_copy_datagram_iter(const struct sk_buff *skb, int offset, end = start + skb_frag_size(frag); if ((copy = end - offset) > 0) { + struct page *page = skb_frag_page(frag); + u8 *vaddr = kmap(page); + if (copy > len) copy = len; - n = copy_page_to_iter(skb_frag_page(frag), - frag->page_offset + offset - - start, copy, to); + n = copy_to_iter(vaddr + frag->page_offset + + offset - start, copy, to); + kunmap(page); offset += n; if (n != copy) goto short_copy;
--
2.17.1