tree d2f55a32923f6d91fcb2e0d0e0b6d2d4eb6f9abd
parent 9766e97af1b901ffbb36fcc648e50626d926bb24
author Willem de Bruijn <willemb@google.com> 1422642571 -0500
committer David S. Miller <davem@davemloft.net> 1422931611 -0800

net-timestamp: no-payload option

Add timestamping option SOF_TIMESTAMPING_OPT_TSONLY. For transmit
timestamps, this loops timestamps on top of empty packets.

Doing so reduces the pressure on SO_RCVBUF. Payload inspection and
cmsg reception (aside from timestamps) are no longer possible. This
works together with a follow on patch that allows administrators to
only allow tx timestamping if it does not loop payload or metadata.

Signed-off-by: Willem de Bruijn <willemb@google.com>

----

Changes (rfc -> v1)
  - add documentation
  - remove unnecessary skb->len test (thanks to Richard Cochran)
Signed-off-by: David S. Miller <davem@davemloft.net>