linux-kernel - Re: [Intel-wired-lan] [PATCH] e1000e: continue to init phy even when failed to disable ULP

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Date:   Tue, 16 Jun 2020 12:20:27 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Aaron Ma <aaron.ma@...onical.com>, jeffrey.t.kirsher@...el.com,
        davem@...emloft.net, kuba@...nel.org,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, vitaly.lifshits@...el.com,
        kai.heng.feng@...onical.com, sasha.neftin@...el.com
Subject: Re: [Intel-wired-lan] [PATCH] e1000e: continue to init phy even when
 failed to disable ULP

Dear Aaron,


Thank you for your patch.

(Rant: Some more fallout from the other patch, which nobody reverted.)

Am 16.06.20 um 12:05 schrieb Aaron Ma:
> After commit "e1000e: disable s0ix entry and exit flows for ME systems",
> some ThinkPads always failed to disable ulp by ME.

Please add the (short) commit hash from the master branch.

s/ulp/ULP/

Please list one ThinkPad as example.

> commit "e1000e: Warn if disabling ULP failed" break out of init phy:

1.  Please add the closing quote ".
2.  Please add the commit hash.

> error log:
> [   42.364753] e1000e 0000:00:1f.6 enp0s31f6: Failed to disable ULP
> [   42.524626] e1000e 0000:00:1f.6 enp0s31f6: PHY Wakeup cause - Unicast Packet
> [   42.822476] e1000e 0000:00:1f.6 enp0s31f6: Hardware Error
> 
> When disable s0ix, E1000_FWSM_ULP_CFG_DONE will never be 1.
> If continue to init phy like before, it can work as before.
> iperf test result good too.
> 
> Chnage e_warn to e_dbg, in case it confuses.

s/Chnage/Change/

Please leave the level warning, and improve the warning message instead, 
so a user knows what is going on.

Could you please add a `Fixes:` tag and the URL to the bug report?

> Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
> ---
>   drivers/net/ethernet/intel/e1000e/ich8lan.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> index f999cca37a8a..63405819eb83 100644
> --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
> +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> @@ -302,8 +302,7 @@ static s32 e1000_init_phy_workarounds_pchlan(struct e1000_hw *hw)
>   	hw->dev_spec.ich8lan.ulp_state = e1000_ulp_state_unknown;
>   	ret_val = e1000_disable_ulp_lpt_lp(hw, true);
>   	if (ret_val) {
> -		e_warn("Failed to disable ULP\n");
> -		goto out;
> +		e_dbg("Failed to disable ULP\n");
>   	}
>   
>   	ret_val = hw->phy.ops.acquire(hw);
> 

Kind regards,

Paul