linux-kernel - Re: Error 'netif_napi_add_weight() called with weight 256'

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Message-ID: <673bc252-2b34-6ef9-1765-9c7cac1e8658@amd.com>
Date:   Mon, 31 Jul 2023 13:23:47 -0500
From:   "Limonciello, Mario" <mario.limonciello@....com>
To:     Jakub Kicinski <kuba@...nel.org>, hayeswang@...ltek.com
Cc:     edumazet@...gle.com, LKML <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, davem@...emloft.net,
        linux-usb@...r.kernel.org, pabeni@...hat.com,
        Paul Menzel <pmenzel@...gen.mpg.de>
Subject: Re: Error 'netif_napi_add_weight() called with weight 256'



On 7/31/2023 1:13 PM, Jakub Kicinski wrote:
> On Mon, 31 Jul 2023 11:02:40 -0500 Limonciello, Mario wrote:
>> Hi,
>>
>> I noticed today with 6.5-rc4 and also on 6.1.42 that I'm getting an
>> error from an r8152 based dongle (Framework ethernet expansion card).
>>
>> netif_napi_add_weight() called with weight 256
>>
>> It seems that this message is likely introduced by
>> 8ded532cd1cbe ("r8152: switch to netif_napi_add_weight()")
>>
>> which if the card has support_2500full set will program the value to 256:
>>
>> 	netif_napi_add_weight(netdev, &tp->napi, r8152_poll,
>> 			      tp->support_2500full ? 256 : 64);
>>
>> It's err level from
>> 82dc3c63c692b ("net: introduce NAPI_POLL_WEIGHT")
>>
>> Why is this considered an error but the driver uses the bigger value?
>> Should it be downgraded to a warning?
> 
> Could you double check that the warning wasn't there before? The code
> added by commit 195aae321c82 ("r8152: support new chips") in 5.13 looks
> very much equivalent.

Yeah; looking through the history I agree it was probably was there from 
the beginning of being introduced.

6.1 is the earliest kernel that is usable with this laptop (for other 
reasons).

> The custom weight is probably due to a misunderstanding. We have 200G
> adapters using the standard weight of 64, IDK why 2.5G adapter would
> need anything special.

Perhaps Hayes Wang can comment on this (as the author of 195aae321c82).