From: Soheil Hassas Yeganeh <soheil.k...@gmail.com> Date: Sat, 2 Apr 2016 23:08:05 -0400
> This patch series aim at enabling TX timestamping via cmsg. > > Currently, to occasionally sample TX timestamping on a socket, > applications need to call setsockopt twice: first for enabling > timestamps and then for disabling them. This is an unnecessary > overhead. With cmsg, in contrast, applications can sample TX > timestamps per sendmsg(). > > This patch series adds the code for processing SO_TIMESTAMPING > for cmsg's of the SOL_SOCKET level, and adds the glue code for > TCP, UDP, and RAW for both IPv4 and IPv6. This implementation > supports overriding timestamp generation flags (i.e., > SOF_TIMESTAMPING_TX_*) but not timestamp reporting flags. > Applications must still enable timestamp reporting via > setsockopt to receive timestamps. > > This series does not change existing timestamping behavior for > applications that are using socket options. > > I will follow up with another patch to enable timestamping for > active TFO (client-side TCP Fast Open) and also setting packet > mark via cmsgs. ... > Changes in v2: > - Replace u32 with __u32 in the documentation. > > Changes in v3: > - Fix the broken build for L2TP (due to changes > in IPv6). Series applied, thanks.
