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| author | Willem de Bruijn <willemb@google.com> | 2019-01-25 11:17:23 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-01-25 22:41:08 -0800 |
| commit | f859a448470304135f7a1af0083b99e188873bb4 (patch) | |
| tree | 670841050b51d1c16a3633ac229fd43e02b42f82 /include/net/tcp.h | |
| parent | 84239b445964b15045e1418ebf28e74121ace309 (diff) | |
| download | linux-f859a448470304135f7a1af0083b99e188873bb4.tar.bz2 | |
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 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 5c950180d61b..a6e0355921e1 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1608,6 +1608,7 @@ struct tcp_fastopen_request { struct msghdr *data; /* data in MSG_FASTOPEN */ size_t size; int copied; /* queued in tcp_connect() */ + struct ubuf_info *uarg; }; void tcp_free_fastopen_req(struct tcp_sock *tp); void tcp_fastopen_destroy_cipher(struct sock *sk); |