path: root/net/ipv4/tcp_output.c
diff options
authorWillem de Bruijn <willemb@google.com>2019-01-25 11:17:23 -0500
committerDavid S. Miller <davem@davemloft.net>2019-01-25 22:41:08 -0800
commitf859a448470304135f7a1af0083b99e188873bb4 (patch)
tree670841050b51d1c16a3633ac229fd43e02b42f82 /net/ipv4/tcp_output.c
parentptp: fix debugfs_simple_attr.cocci warnings (diff)
tcp: allow zerocopy with fastopen
Accept MSG_ZEROCOPY in all the TCP states that allow sendmsg. Remove the explicit check for ESTABLISHED and CLOSE_WAIT states. This requires correctly handling zerocopy state (uarg, sk_zckey) in all paths reachable from other TCP states. Such as the EPIPE case in sk_stream_wait_connect, which a sendmsg() in incorrect state will now hit. Most paths are already safe. Only extension needed is for TCP Fastopen active open. This can build an skb with data in tcp_send_syn_data. Pass the uarg along with other fastopen state, so that this skb also generates a zerocopy notification on release. Tested with active and passive tcp fastopen packetdrill scripts at https://github.com/wdebruij/packetdrill/commit/1747eef03d25a2404e8132817d0f1244fd6f129d Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 6527f61f59ff..26a2948dca95 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3455,6 +3455,7 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn)
skb_trim(syn_data, copied);
space = copied;
+ skb_zcopy_set(syn_data, fo->uarg, NULL);
/* No more data pending in inet_wait_for_connect() */
if (space == fo->size)