sock: add SOCK_ZEROCOPY sockopt
authorWillem de Bruijn <willemb@google.com>
Thu, 3 Aug 2017 20:29:40 +0000 (16:29 -0400)
committerDavid S. Miller <davem@davemloft.net>
Fri, 4 Aug 2017 04:37:29 +0000 (21:37 -0700)
commit76851d1212c11365362525e1e2c0a18c97478e6b
treea9f9c1795f51c31d46e8282674e5d45f46ce1cbe
parent52267790ef52d7513879238ca9fac22c1733e0e3
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>
13 files changed:
arch/alpha/include/uapi/asm/socket.h
arch/frv/include/uapi/asm/socket.h
arch/ia64/include/uapi/asm/socket.h
arch/m32r/include/uapi/asm/socket.h
arch/mips/include/uapi/asm/socket.h
arch/mn10300/include/uapi/asm/socket.h
arch/parisc/include/uapi/asm/socket.h
arch/s390/include/uapi/asm/socket.h
arch/sparc/include/uapi/asm/socket.h
arch/xtensa/include/uapi/asm/socket.h
include/uapi/asm-generic/socket.h
net/core/skbuff.c
net/core/sock.c