80fcec6751
If skb has the (rcv) timestamp available, nfnetlink_{log, queue}.c
logs/outputs it to the userspace. When the locally generated skb is
looping from egress to ingress over a virtual interface (e.g. veth,
loopback...), skb->tstamp may have the delivery time before it is
known that will be delivered locally and received by another sk. Like
handling the delivery time in network tapping, use ktime_get_real() to
get the (rcv) timestamp. The earlier added helper skb_tstamp_cond() is
used to do this. false is passed to the second 'cond' arg such
that doing ktime_get_real() or not only depends on the
netstamp_needed_key static key.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.