diff options
| author | Willem de Bruijn <willemb@google.com> | 2014-07-26 00:01:32 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-07-29 20:39:50 +0200 |
| commit | 4d276eb6a478307a28ae843836c455bf04b37a3c (patch) | |
| tree | 2915bc3a3e8ea825e7b02349b05915aaff8a91eb /Documentation/networking/timestamping | |
| parent | packet: remove deprecated syststamp timestamp (diff) | |
| download | linux-4d276eb6a478307a28ae843836c455bf04b37a3c.tar.xz linux-4d276eb6a478307a28ae843836c455bf04b37a3c.zip | |
net: remove deprecated syststamp timestamp
The SO_TIMESTAMPING API defines three types of timestamps: software,
hardware in raw format (hwtstamp) and hardware converted to system
format (syststamp). The last has been deprecated in favor of combining
hwtstamp with a PTP clock driver. There are no active users in the
kernel.
The option was device driver dependent. If set, but without hardware
support, the correct behavior is to return zero in the relevant field
in the SCM_TIMESTAMPING ancillary message. Without device drivers
implementing the option, this field is effectively always zero.
Remove the internal plumbing to dissuage new drivers from implementing
the feature. Keep the SOF_TIMESTAMPING_SYS_HARDWARE flag, however, to
avoid breaking existing applications that request the timestamp.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking/timestamping')
| -rw-r--r-- | Documentation/networking/timestamping/timestamping.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/Documentation/networking/timestamping/timestamping.c b/Documentation/networking/timestamping/timestamping.c index 8ba82bfe6a33..5cdfd743447b 100644 --- a/Documentation/networking/timestamping/timestamping.c +++ b/Documentation/networking/timestamping/timestamping.c @@ -76,7 +76,6 @@ static void usage(const char *error) " SOF_TIMESTAMPING_RX_HARDWARE - hardware time stamping of incoming packets\n" " SOF_TIMESTAMPING_RX_SOFTWARE - software fallback for incoming packets\n" " SOF_TIMESTAMPING_SOFTWARE - request reporting of software time stamps\n" - " SOF_TIMESTAMPING_SYS_HARDWARE - request reporting of transformed HW time stamps\n" " SOF_TIMESTAMPING_RAW_HARDWARE - request reporting of raw HW time stamps\n" " SIOCGSTAMP - check last socket time stamp\n" " SIOCGSTAMPNS - more accurate socket time stamp\n"); @@ -202,9 +201,7 @@ static void printpacket(struct msghdr *msg, int res, (long)stamp->tv_sec, (long)stamp->tv_nsec); stamp++; - printf("HW transformed %ld.%09ld ", - (long)stamp->tv_sec, - (long)stamp->tv_nsec); + /* skip deprecated HW transformed */ stamp++; printf("HW raw %ld.%09ld", (long)stamp->tv_sec, @@ -361,8 +358,6 @@ int main(int argc, char **argv) so_timestamping_flags |= SOF_TIMESTAMPING_RX_SOFTWARE; else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_SOFTWARE")) so_timestamping_flags |= SOF_TIMESTAMPING_SOFTWARE; - else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_SYS_HARDWARE")) - so_timestamping_flags |= SOF_TIMESTAMPING_SYS_HARDWARE; else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RAW_HARDWARE")) so_timestamping_flags |= SOF_TIMESTAMPING_RAW_HARDWARE; else |