netdev - [PATCH] NET : convert network timestamps to ktime

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Date:	Mon, 05 Mar 2007 08:40:03 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	David Miller <davem@...emloft.net>
CC:	shemminger@...ux-foundation.org, linux.kernel@...e.fr,
	netdev@...r.kernel.org
Subject: [PATCH] NET : convert network timestamps to ktime_t

Hi David

Here is the second version of this patch, including missing bits spoted by 
Stephen. This is against net-2.6.22

Thank you

[PATCH] NET : convert network timestamps to ktime_t

We currently use a special structure (struct skb_timeval) and plain 'struct
timeval' to store packet timestamps in sk_buffs and struct sock.

This has some drawbacks :
- Fixed resolution of micro second.
- Waste of space on 64bit platforms where sizeof(struct timeval)=16

I suggest using ktime_t that is a nice abstraction of high resolution time
services, currently capable of nanosecond resolution.

As sizeof(ktime_t) is 8 bytes, using ktime_t in 'struct sock' permits a 8 byte
shrink of this structure on 64bit architectures. Some other structures also
benefit from this size reduction (struct ipq in ipv4/ip_fragment.c, struct
frag_queue in ipv6/reassembly.c, ...)


Once this ktime infrastructure adopted, we can more easily provide nanosecond
resolution on top of it. (ioctl SIOCGSTAMPNS and/or
SO_TIMESTAMPNS/SCM_TIMESTAMPNS)

Note : this patch includes a bug correction in compat_sock_get_timestamp()
where a "err = 0;" was missing (so this syscall returned -ENOENT instead of
0)

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
CC: Stephen Hemminger <shemminger@...ux-foundation.org>
CC: John find <linux.kernel@...e.fr>

  include/linux/skbuff.h                  |   26 ++++------------------
  include/net/sock.h                      |   18 +++++++--------
  kernel/time.c                           |    1
  net/bridge/netfilter/ebt_ulog.c         |    6 +++--
  net/compat.c                            |   15 ++++++++----
  net/core/dev.c                          |   19 +++-------------
  net/core/sock.c                         |   16 +++++++------
  net/econet/af_econet.c                  |    2 -
  net/ipv4/ip_fragment.c                  |    8 +++---
  net/ipv4/netfilter/ip_queue.c           |    6 +++--
  net/ipv4/netfilter/ipt_ULOG.c           |    8 ++++--
  net/ipv6/exthdrs.c                      |    2 -
  net/ipv6/netfilter/ip6_queue.c          |    6 +++--
  net/ipv6/netfilter/nf_conntrack_reasm.c |    6 ++---
  net/ipv6/reassembly.c                   |    6 ++---
  net/ipx/af_ipx.c                        |    4 +--
  net/netfilter/nfnetlink_log.c           |    8 +++---
  net/netfilter/nfnetlink_queue.c         |    8 +++---
  net/packet/af_packet.c                  |    8 ++++--
  net/sunrpc/svcsock.c                    |   10 ++------
  20 files changed, 85 insertions(+), 98 deletions(-)

View attachment "net_stamp_ktime_2.patch" of type "text/plain" (17195 bytes)