net: Add a new socket option for a future transmit time.
This patch introduces SO_TXTIME. User space enables this option in order to pass a desired future transmit time in a CMSG when calling sendmsg(2). The argument to this socket option is a 8-bytes long struct provided by the uapi header net_tstamp.h defined as: struct sock_txtime { clockid_t clockid; u32 flags; }; Note that new fields were added to struct sock by filling a 2-bytes hole found in the struct. For that reason, neither the struct size or number of cachelines were altered. Signed-off-by:Richard Cochran <rcochran@linutronix.de> Signed-off-by:
Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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c47d8c2f
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