Re: [PATCH net-next v2 04/13] sock: add SOCK_ZEROCOPY sockopt

On Wed, Jun 21, 2017 at 4:36 PM, Willem de Bruijn
[off-list ref] wrote:

From: Willem de Bruijn <redacted>

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 <redacted>

This was not rebased on top of the SO_PEERGROUPS patch. I will send a v3.