netdev - Re: [net-next-2.6 PATCH] ixgbe: fix for link failure on SFP+ DA cables

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Date:	Wed, 01 Dec 2010 23:41:41 -0800
From:	Joe Perches <joe@...ches.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, gospo@...hat.com,
	bphilips@...ell.com, Don Skidmore <donald.c.skidmore@...el.com>
Subject: Re: [net-next-2.6 PATCH] ixgbe: fix for link failure on SFP+ DA
 cables

On Wed, 2010-12-01 at 22:59 -0800, Jeff Kirsher wrote:
> This patch helps prevent FW/SW semaphore collision from leading
> to link establishment failure.  The collision might mess up the
> PHY registers so we reset the PHY.  However there are SFI/KR areas
> in the PHY that are not reset with a Reset_AN so we need to change
> LMS to reset it.  Also wait until AN state machine is AN_GOOD
[]
>  drivers/net/ixgbe/ixgbe_82599.c |   28 +++++++++++++++++++++++++---
> diff --git a/drivers/net/ixgbe/ixgbe_82599.c b/drivers/net/ixgbe/ixgbe_82599.c
[]
> @@ -116,14 +118,34 @@ static s32 ixgbe_setup_sfp_modules_82599(struct ixgbe_hw *hw)
>  			IXGBE_WRITE_FLUSH(hw);
>  			hw->eeprom.ops.read(hw, ++data_offset, &data_value);
>  		}
> -		/* Now restart DSP by setting Restart_AN */
> -		IXGBE_WRITE_REG(hw, IXGBE_AUTOC,
> -		    (IXGBE_READ_REG(hw, IXGBE_AUTOC) | IXGBE_AUTOC_AN_RESTART));
>  
>  		/* Release the semaphore */
>  		ixgbe_release_swfw_sync(hw, IXGBE_GSSR_MAC_CSR_SM);
>  		/* Delay obtaining semaphore again to allow FW access */
>  		msleep(hw->eeprom.semaphore_delay);

might these msleeps be usleep_range?

[]

> +		/* Wait for AN to leave state 0 */
> +		for (i = 0; i < 10; i++) {
> +			msleep(4);

Perhaps usleep_range?

Maybe all the msleep uses < 20ms in the intel drivers?

$ grep -nPr --include=*.[ch] "msleep\s*\(\s*1?\d\s*\)" drivers/net/ig* drivers/net/ixg* drivers/net/e100* | wc -l
123

Maybe something like doubling the sleep value
for the upper bound range?

Here's a little script that does that.

$ grep -nPrl --include=*.[ch] "msleep\s*\(\s*1?\d\s*\)" \
	drivers/net/ig* drivers/net/ixg* drivers/net/e100* | \
xargs perl -p -i -e 's/msleep\s*\(\s*(1?\d)\s*\)/"usleep_range\(${1}000, " . scalar($1) * 2 . "000\)"/ge'


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