netdev - Re: [Intel-wired-lan] [PATCH v1 iwl-net] igb: fix link test skipping when interface is admin down

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Message-ID: <9ee14d54-b680-4b1a-82c2-56c0c1b26fa1@molgen.mpg.de>
Date: Fri, 15 Aug 2025 09:38:01 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Kohei Enju <enjuk@...zon.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
 Tony Nguyen <anthony.l.nguyen@...el.com>,
 Przemek Kitszel <przemyslaw.kitszel@...el.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Alexander Duyck <alexander.h.duyck@...el.com>, kohei.enju@...il.com
Subject: Re: [Intel-wired-lan] [PATCH v1 iwl-net] igb: fix link test skipping
 when interface is admin down

Dear Kohei,

Thank you very much for your patch.

Am 15.08.25 um 08:26 schrieb Kohei Enju:
> The igb driver incorrectly skips the link test when the network
> interface is admin down (if_running == false), causing the test to
> always report PASS regardless of the actual physical link state.
> 
> This behavior is inconsistent with other drivers (e.g. i40e, ice, ixgbe,
> etc.) which correctly test the physical link state regardless of admin
> state.

I’d collapse the above two sentences into one paragraph and add an empty 
line here to visually separate the paragraph below.

> Remove the if_running check to ensure link test always reflects the
> physical link state.

Please add how to verify your change, that means the command to run.

> Fixes: 8d420a1b3ea6 ("igb: correct link test not being run when link is down")
> Signed-off-by: Kohei Enju <enjuk@...zon.com>
> ---
>   drivers/net/ethernet/intel/igb/igb_ethtool.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
> index ca6ccbc13954..6412c84e2d17 100644
> --- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
> +++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
> @@ -2081,11 +2081,8 @@ static void igb_diag_test(struct net_device *netdev,
>   	} else {
>   		dev_info(&adapter->pdev->dev, "online testing starting\n");
>   
> -		/* PHY is powered down when interface is down */
> -		if (if_running && igb_link_test(adapter, &data[TEST_LINK]))
> +		if (igb_link_test(adapter, &data[TEST_LINK]))
>   			eth_test->flags |= ETH_TEST_FL_FAILED;
> -		else
> -			data[TEST_LINK] = 0;
>   
>   		/* Online tests aren't run; pass by default */
>   		data[TEST_REG] = 0;

Regardless of my style comments above:

Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>

Kind regards,

Paul