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authorJohn Fastabend <john.fastabend@gmail.com>2018-03-18 12:57:00 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2018-03-19 21:14:38 +0100
commit312fc2b4c82e96a48cb2d0da2bd4816eb253c499 (patch)
tree6bcfadb456706b7e326c46f17bff214e56181fcc /net/ipv4
parentffa35660017161524b7db79b0ce293fa1af16c4d (diff)
downloadlinux-312fc2b4c82e96a48cb2d0da2bd4816eb253c499.tar.bz2
net: do_tcp_sendpages flag to avoid SKBTX_SHARED_FRAG
When calling do_tcp_sendpages() from in kernel and we know the data has no references from user side we can omit SKBTX_SHARED_FRAG flag. This patch adds an internal flag, NO_SKBTX_SHARED_FRAG that can be used to omit setting SKBTX_SHARED_FRAG. The flag is not exposed to userspace because the sendpage call from the splice logic masks out all bits except MSG_MORE. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index fb350f740f69..f90ec24c2cc8 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -994,7 +994,9 @@ new_segment:
get_page(page);
skb_fill_page_desc(skb, i, page, offset, copy);
}
- skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
+
+ if (!(flags & MSG_NO_SHARED_FRAGS))
+ skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
skb->len += copy;
skb->data_len += copy;