linux-kernel - Re: [PATCH] sky2: flow control off

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

Date:	Tue, 06 Feb 2007 19:18:07 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] sky2: flow control off

Stephen Hemminger wrote:
> Turn flow control off for sky2. When flow control is on, the transmitter
> may get randomly stuck. Perhaps there is hardware problem, but until
> Marvell provides errata information for workaround, it should default to off.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
> ---
>  drivers/net/sky2.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
> index 822dd0b..a31dea5 100644
> --- a/drivers/net/sky2.c
> +++ b/drivers/net/sky2.c
> @@ -3263,7 +3263,7 @@ #endif
>  
>  	/* Auto speed and flow control */
>  	sky2->autoneg = AUTONEG_ENABLE;
> -	sky2->flow_mode = FC_BOTH;
> +	sky2->flow_mode = FC_NONE;

I ACK the patch... conditional on some -mm style testing and user ACKs.

Logic:  if there were no downsides to disabling flow control globally, 
the world's networks would have already done so.  Flow control can be 
quite helpful, so I while I understand the errata argument, I also want 
to understand the full effect of this tiny patch.

	Jeff



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/