netdev - Re: [Intel-wired-lan] [PATCH iwl-net v2 2/4] igc: Lengthen the hardware retry time to prevent timeouts

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Message-ID: <f009f059-f421-22f8-4541-ad10d4589efe@intel.com>
Date: Thu, 31 Oct 2024 11:35:21 +0200
From: Avigail Dahan <Avigailx.dahan@...el.com>
To: Chris H <christopher.s.hall@...el.com>, <intel-wired-lan@...ts.osuosl.org>
CC: <david.zage@...el.com>, <vinicius.gomes@...el.com>,
	<netdev@...r.kernel.org>, <rodrigo.cadore@...coustics.com>,
	<vinschen@...hat.com>
Subject: Re: [Intel-wired-lan] [PATCH iwl-net v2 2/4] igc: Lengthen the
 hardware retry time to prevent timeouts



On 23/10/2024 5:30, Chris H wrote:
> From: Christopher S M Hall <christopher.s.hall@...el.com>
> 
> Lengthen the hardware retry timer to four microseconds.
> 
> The i225/i226 hardware retries if it receives an inappropriate response
> from the upstream device. If the device retries too quickly, the root
> port does not respond.
> 
> The issue can be reproduced with the following:
> 
> $ sudo phc2sys -R 1000 -O 0 -i tsn0 -m
> 
> Note: 1000 Hz (-R 1000) is unrealistically large, but provides a way to
> quickly reproduce the issue.
> 
> PHC2SYS exits with:
> 
> "ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction
>    fails
> 
> Fixes: 6b8aa753a9f9 ("igc: Decrease PTM short interval from 10 us to 1 us")
> Signed-off-by: Christopher S M Hall <christopher.s.hall@...el.com>
> ---
>   drivers/net/ethernet/intel/igc/igc_defines.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>Tested-by: Avigail Dahan <avigailx.dahan@...el.com>