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| author | Kornilios Kourtis <kou@zurich.ibm.com> | 2018-01-09 09:52:22 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-10 15:01:49 -0500 |
| commit | af60d61fa846725566f4a876ae04f891bdff1c7a (patch) | |
| tree | 2c280254a7e5564cb444d8512f58e0e205b98258 | |
| parent | 11d827a993a969c3c6ec56758ff63a44ba19b466 (diff) | |
doc: clarification about setting SO_ZEROCOPY
Signed-off-by: Kornilios Kourtis <kou@zurich.ibm.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | Documentation/networking/msg_zerocopy.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/networking/msg_zerocopy.rst b/Documentation/networking/msg_zerocopy.rst index 77f6d7e25cfd..291a01264967 100644 --- a/Documentation/networking/msg_zerocopy.rst +++ b/Documentation/networking/msg_zerocopy.rst @@ -72,6 +72,10 @@ this flag, a process must first signal intent by setting a socket option: if (setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &one, sizeof(one))) error(1, errno, "setsockopt zerocopy"); +Setting the socket option only works when the socket is in its initial +(TCP_CLOSED) state. Trying to set the option for a socket returned by accept(), +for example, will lead to an EBUSY error. In this case, the option should be set +to the listening socket and it will be inherited by the accepted sockets. Transmission ------------ |