netdev - Re: [PATCH net-next 07/11] tg3: Add support for link flap avoidance

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Date:	Tue, 09 Apr 2013 15:15:40 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	nsujir@...adcom.com
Cc:	netdev@...r.kernel.org, mchan@...adcom.com
Subject: Re: [PATCH net-next 07/11] tg3: Add support for link flap avoidance

From: "Nithin Nayak Sujir" <nsujir@...adcom.com>
Date: Tue, 9 Apr 2013 11:48:07 -0700

> This patch and the following two patches add support for link flap avoidance
> by maintaining the link on power down. This feature is required for
> management capable devices to have the management connection
> uninterrupted on driver reload, reboot and interface up/down.
> 
> The other pros of this feature are
>  - It speeds up boot up time by several seconds as DHCP addresses can be
>    acquired faster.
>  - It avoids lengthy Spanning Tree delay.
> 
> On powerup the hardware brings up the phy with default settings. If the
> link is not up, the management software configures the phy to gigabit
> and starts autonegotiate. Subsequently, as long as the link is up, the
> driver and management refrain from resetting and/or changing any
> configuration that the link depends on.
> 
> The LNK_FLAP_AVOID setting is an NVRAM user configurable bit and is
> disabled by default.  If this setting is enabled, we skip powering down
> the phy and resetting it.
> 
> A second NVRAM setting is 1G_ON_VAUX_OK (off by default). This adds
> support for gigabit link speed when device is on auxiliary power.
> 
> Signed-off-by: Nithin Nayak Sujir <nsujir@...adcom.com>
> Signed-off-by: Michael Chan <mchan@...adcom.com>

Looks good, all applied, thanks.

If we force a PHY reset due to EEE changes, will the ASF traffic
disruption warning message be emitted?
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