netdev - RE: [PATCH] igb: add conditions for I210 to generate periodic clock output

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <309B89C4C689E141A5FF6A0C5FB2118B81E4F1D6@ORSMSX101.amr.corp.intel.com>
Date:	Thu, 14 Jan 2016 03:22:17 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	"Hii, Roland King Guan" <roland.king.guan.hii@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] igb: add conditions for I210 to generate periodic clock
 output

> From: netdev-owner@...r.kernel.org [netdev-owner@...r.kernel.org] on behalf of Roland Hii [roland.king.guan.hii@...el.com]
> Sent: Sunday, January 10, 2016 11:34 PM
> To: Kirsher, Jeffrey T
> Cc: intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH] igb: add conditions for I210 to generate periodic clock output
> 
> In general case the maximum supported half cycle time of the synchronized
> output clock is 70msec. Slower half cycle time than 70msec can be
> programmed also as long as the output clock is synchronized to whole
> seconds, useful specifically for generating a 1Hz clock.
> 
> Permitted values for the clock half cycle time are: 125,000,000 decimal,
> 250,000,000 decimal and 500,000,000 decimal (equals to 125msec, 250msec
> and 500msec respectively).
> 
> Before this patch, only the half cycle time of less than or equal to 70msec
> uses the I210 clock output function. This patch adds additional conditions
> when half cycle time is equal to 125msec or 250msec or 500msec to use
> clock output function.
> 
> Under other conditions, interrupt driven target time output events method
> is still used to generate the desired clock output.
> 
> Signed-off-by: Roland Hii <roland.king.guan.hii@...el.com>
> ---
>  drivers/net/ethernet/intel/igb/igb_ptp.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Tested-by: Aaron Brown <aaron.f.brown@...el.com>