lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-Id: <cover.1351696507.git.richardcochran@gmail.com> Date: Wed, 31 Oct 2012 17:19:06 +0100 From: Richard Cochran <richardcochran@...il.com> To: <netdev@...r.kernel.org> Cc: David Miller <davem@...emloft.net>, Jacob Keller <jacob.e.keller@...el.com>, John Stultz <john.stultz@...aro.org>, Miroslav Lichvar <mlichvar@...hat.com> Subject: [PATCH V2 net-next 0/1] ptp: add pseudo pps ioctl No changes in V2, except removing the RFC label and adding Jacob's ack. This patch adds a kind of "poor man's PPS" for use with those PHC drivers which do not support a true PPS. Using this ioctl, user space can estimate the system-phc offset and tune one of the clocks as desired. This patch has been tested on both the Intel igb (PCIe card) and the National Semiconductor phyter (PHY via MDIO bus), and the results seem quite promising. This patch avoids the "timecompare" code on purpose, since experiments have shown that code to be quite brittle, having been tuned to only one specific kind of hardware. Thanks, Richard Richard Cochran (1): ptp: add an ioctl to compare PHC time with system time drivers/ptp/ptp_chardev.c | 32 ++++++++++++++++++++++++++++++++ include/uapi/linux/ptp_clock.h | 14 ++++++++++++++ 2 files changed, 46 insertions(+), 0 deletions(-) -- 1.7.2.5 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists