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net-timestamp: extend SCM_TIMESTAMPING ancillary data struct

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Applications that request kernel tx timestamps with SO_TIMESTAMPING
read timestamps as recvmsg() ancillary data. The response is defined
implicitly as timespec[3].

1) define struct scm_timestamping explicitly and

2) add support for new tstamp types. On tx, scm_timestamping always
   accompanies a sock_extended_err. Define previously unused field
   ee_info to signal the type of ts[0]. Introduce SCM_TSTAMP_SND to
   define the existing behavior.

The reception path is not modified. On rx, no struct similar to
sock_extended_err is passed along with SCM_TIMESTAMPING.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2014-08-04 22:11:45 -04:00 • committed by David S. Miller
parent a2b81b35f9
commit f24b9be595
5 changed files with 36 additions and 10 deletions
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3
include/linux/skbuff.h
View file

@ -249,6 +249,9 @@ enum {
SKBTX_SHARED_FRAG = 1 << 5,
};
#define SKBTX_ANY_SW_TSTAMP SKBTX_SW_TSTAMP
#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
/*
* The callback notifies userspace to release buffers when skb DMA is done in
* lower device, the skb last reference should be 0 when calling this.