netdev - Re: [Intel-wired-lan] [PATCH iwl-net] i40e: Fix handling changed priv flags

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Message-ID: <cf6dd743-759e-4db9-8811-fd1520262412@molgen.mpg.de>
Date: Wed, 30 Oct 2024 17:38:12 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Peter Große <pegro@...iks.de>
Cc: intel-wired-lan@...ts.osuosl.org, Tony Nguyen
 <anthony.l.nguyen@...el.com>, netdev@...r.kernel.org,
 Przemek Kitszel <przemyslaw.kitszel@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH iwl-net] i40e: Fix handling changed priv
 flags

[Cc: -Jesse 550 #5.1.0 Address rejected.]

Am 30.10.24 um 17:34 schrieb Paul Menzel:
> [Cc: +Przemek who succeeded Jesse]
> 
> Dear Peter,
> 
> 
> Thank you very much for your patch. Some minor comments.
> 
> Am 30.10.24 um 17:06 schrieb pegro@...iks.de:
>> From: Peter Große <pegro@...iks.de>
>>
>> After assembling the new private flags on a PF, the operation to determine
>> the changed flags uses the wrong bitmaps. Instead of xor-ing orig_flags with
>> new_flags, it uses the still unchanged pf->flags, thus changed_flags is always 0.
> 
> It’d be great if you reflowed for 75 characters per line.
> 
>> Fix it by using the corrent bitmaps.
> 
> corre*c*t
> 
>> The issue was discovered while debugging why disabling source pruning
>> stopped working with release 6.7. Although the new flags will be copied to
>> pf->flags later on in that function, source pruning requires a reset of the PF,
>> which was skipped due to this bug.
> 
> If you have the actual commands handy to reproduce it, that’d be great 
> to have in the commit message.
> 
>> Fixes: 70756d0a4727 ("i40e: Use DECLARE_BITMAP for flags and hw_features fields in i40e_pf")
>> Signed-off-by: Peter Große <pegro@...iks.de>
>> ---
>>   drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/ 
>> net/ethernet/intel/i40e/i40e_ethtool.c
>> index c841779713f6..016c0ae6b36f 100644
>> --- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
>> +++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
>> @@ -5306,7 +5306,7 @@ static int i40e_set_priv_flags(struct net_device *dev, u32 flags)
>>       }
>>   flags_complete:
>> -    bitmap_xor(changed_flags, pf->flags, orig_flags, I40E_PF_FLAGS_NBITS);
>> +    bitmap_xor(changed_flags, new_flags, orig_flags, I40E_PF_FLAGS_NBITS);
>>       if (test_bit(I40E_FLAG_FW_LLDP_DIS, changed_flags))
>>           reset_needed = I40E_PF_RESET_AND_REBUILD_FLAG;
> 
> With the style fixes above:
> 
> Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>
> 
> 
> Kind regards,
> 
> Paul