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sock: add SOCK_ZEROCOPY sockopt

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The send call ignores unknown flags. Legacy applications may already
unwittingly pass MSG_ZEROCOPY. Continue to ignore this flag unless a
socket opts in to zerocopy.

Introduce socket option SO_ZEROCOPY to enable MSG_ZEROCOPY processing.
Processes can also query this socket option to detect kernel support
for the feature. Older kernels will return ENOPROTOOPT.

Signed-off-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Willem de Bruijn 2017-08-03 16:29:40 -04:00 • committed by David S. Miller
commit 76851d1212
13 changed files with 43 additions and 0 deletions
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arch/xtensa/include/uapi/asm/socket.h
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@ -113,4 +113,6 @@
#define SO_PEERGROUPS 59
#define SO_ZEROCOPY 60
#endif /* _XTENSA_SOCKET_H */