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Message-ID: <45E77649.8050108@cosmosbay.com>
Date: Fri, 02 Mar 2007 01:56:41 +0100
From: Eric Dumazet <dada1@...mosbay.com>
To: Stephen Hemminger <shemminger@...ux-foundation.org>
CC: John find <linux.kernel@...e.fr>, linux-net@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: CLOCK_MONOTONIC datagram timestamps by the kernel
Stephen Hemminger a écrit :
> Another value since if someone turns on SO_TIMESTAMP they want usec (timeval)
> and SO_TIMESTAMPNS would be for nanosecond values. Trying to set both
> flags would be not allowed.
>
> - original -
>
> If the SO_TIMESTAMP option is enabled on a SOCK_DGRAM socket, the
> recvmsg(2) call will return a timestamp corresponding to when the data-
> gram was received. The msg_control field in the msghdr structure points
> to a buffer that contains a cmsghdr structure followed by a struct
> timeval. The cmsghdr fields have the following values:
>
> cmsg_len = sizeof(struct timeval)
> cmsg_level = SOL_SOCKET
> cmsg_type = SCM_TIMESTAMP
>
> - add -
> If the SO_TIMESTAMPNS option is enabled on a SOCK_DGRAM socket,
> ...
> cmsg_len = sizeof(struct timespec)
> cmsg_level = SOL_SOCKET
> cmsg_type = SCM_TIMESTAMPNS
I got it now, thank you :)
Here is the second version of the patch.
[NET] : introduce nanosecond time infrastructure for packet timestamping
It appears some machines are *really* fast and that micro second resolution is
a limiting factor.
This patch converts sk_buff timestamp to use new nanosecond infra (added in
2.6.21), and introduces a new ioctl SIOCGSTAMPNS to let applications access
nanosecond resolution (ie a timespec instead of timeval)
SO_TIMESTAMPNS is also introduced so that a recvmsg() on SOCK_DGRAM socket may
transfer a struct timespec (cmsg_type = SCM_TIMESTAMPNS). SO_TIMESTAMP and
SO_TIMESTAMPNS are mutually exclusive.
Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
fs/compat_ioctl.c | 17 +++++++++
include/asm-alpha/socket.h | 2 +
include/asm-alpha/sockios.h | 1
include/asm-arm/socket.h | 2 +
include/asm-arm26/socket.h | 2 +
include/asm-arm26/sockios.h | 3 +
include/asm-avr32/socket.h | 2 +
include/asm-avr32/sockios.h | 3 +
include/asm-cris/sockios.h | 3 +
include/asm-frv/socket.h | 2 +
include/asm-frv/sockios.h | 3 +
include/asm-h8300/socket.h | 2 +
include/asm-h8300/sockios.h | 3 +
include/asm-i386/socket.h | 2 +
include/asm-i386/sockios.h | 3 +
include/asm-ia64/socket.h | 2 +
include/asm-ia64/sockios.h | 3 +
include/asm-m32r/socket.h | 2 +
include/asm-m32r/sockios.h | 3 +
include/asm-m68k/socket.h | 2 +
include/asm-m68k/sockios.h | 3 +
include/asm-mips/socket.h | 2 +
include/asm-mips/sockios.h | 3 +
include/asm-parisc/socket.h | 2 +
include/asm-parisc/sockios.h | 3 +
include/asm-powerpc/socket.h | 2 +
include/asm-powerpc/sockios.h | 3 +
include/asm-s390/socket.h | 2 -
include/asm-s390/sockios.h | 3 +
include/asm-sh/socket.h | 2 -
include/asm-sh/sockios.h | 1
include/asm-sh64/sockios.h | 1
include/asm-sparc/socket.h | 2 +
include/asm-sparc/sockios.h | 3 +
include/asm-sparc64/socket.h | 2 +
include/asm-sparc64/sockios.h | 3 +
include/asm-v850/socket.h | 2 +
include/asm-v850/sockios.h | 3 +
include/asm-x86_64/socket.h | 2 +
include/asm-x86_64/sockios.h | 3 +
include/asm-xtensa/socket.h | 2 +
include/asm-xtensa/sockios.h | 3 +
include/linux/skbuff.h | 38 ++++++++++++++++------
include/net/compat.h | 1
include/net/sock.h | 31 ++++++++++++-----
net/appletalk/ddp.c | 3 +
net/atm/ioctl.c | 3 +
net/ax25/af_ax25.c | 4 ++
net/bridge/netfilter/ebt_ulog.c | 7 ++--
net/compat.c | 33 +++++++++++++++++--
net/core/dev.c | 8 ++--
net/core/sock.c | 36 +++++++++++++++++++-
net/econet/af_econet.c | 5 ++
net/ipv4/af_inet.c | 3 +
net/ipv4/ip_fragment.c | 6 +--
net/ipv4/netfilter/ip_queue.c | 2 -
net/ipv4/netfilter/ipt_ULOG.c | 2 -
net/ipv6/af_inet6.c | 3 +
net/ipv6/netfilter/ip6_queue.c | 2 -
net/ipv6/netfilter/nf_conntrack_reasm.c | 6 +--
net/ipv6/reassembly.c | 6 +--
net/ipx/af_ipx.c | 2 -
net/netfilter/nfnetlink_log.c | 2 -
net/netfilter/nfnetlink_queue.c | 2 -
net/netrom/af_netrom.c | 5 ++
net/packet/af_packet.c | 4 +-
net/rose/af_rose.c | 2 +
net/sunrpc/svcsock.c | 9 ++---
net/wanrouter/af_wanpipe.c | 3 +
net/x25/af_x25.c | 12 ++++++
70 files changed, 280 insertions(+), 74 deletions(-)
View attachment "net_nanosec_stamp.patch" of type "text/plain" (42389 bytes)
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