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Commit 76851d12 authored Aug 03, 2017 by Willem de Bruijn Committed by David S. Miller Aug 03, 2017

sock: add SOCK_ZEROCOPY sockopt



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 <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 52267790

arch/alpha/include/uapi/asm/socket.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -109,4 +109,6 @@

		#define SO_PEERGROUPS 59

		#define SO_ZEROCOPY 60

		#endif /* _UAPI_ASM_SOCKET_H */

arch/frv/include/uapi/asm/socket.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -102,5 +102,7 @@

		#define SO_PEERGROUPS 59

		#define SO_ZEROCOPY 60

		#endif /* _ASM_SOCKET_H */

arch/ia64/include/uapi/asm/socket.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -111,4 +111,6 @@

		#define SO_PEERGROUPS 59

		#define SO_ZEROCOPY 60

		#endif /* _ASM_IA64_SOCKET_H */

arch/m32r/include/uapi/asm/socket.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -102,4 +102,6 @@

		#define SO_PEERGROUPS 59

		#define SO_ZEROCOPY 60

		#endif /* _ASM_M32R_SOCKET_H */

arch/mips/include/uapi/asm/socket.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -120,4 +120,6 @@

		#define SO_PEERGROUPS 59

		#define SO_ZEROCOPY 60

		#endif /* _UAPI_ASM_SOCKET_H */