netdev - Re: [PATCH] igb: Allocate MSI-X vector when testing

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Date:   Tue, 22 Nov 2022 22:17:41 +0900
From:   Akihiko Odaki <akihiko.odaki@...nix.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Yan Vugenfirer <yan@...nix.com>,
        Yuri Benditovich <yuri.benditovich@...nix.com>
Subject: Re: [PATCH] igb: Allocate MSI-X vector when testing

On 2022/11/22 21:15, Maciej Fijalkowski wrote:
> On Tue, Nov 22, 2022 at 09:13:12PM +0900, Akihiko Odaki wrote:
>> Allocate MSI-X vector when testing interrupts, otherwise the tests will
>> not work.
> 
> Hi,
> 
> can you say a bit more about why current code was broken? And also what is
> the current result of that ethtool test?
> 
> Also this is a fix, please provide Fixes: tag and route it to net tree.

Hi, I have just sent v2, please check it out.

Regarding Fixes: tag, I couldn't tell when the bug appeared. The 
modified function, igb_intr_test() lacked the interrupt allocation code 
from the start. My guess is that some code in igb_reset() or after the 
function had code to allocate interrupts in the past and later removed. 
But I couldn't find such code.

Regards,
Akihiko Odaki

> 
>>
>> Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
>> ---
>>   drivers/net/ethernet/intel/igb/igb_ethtool.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
>> index e5f3e7680dc6..ff911af16a4b 100644
>> --- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
>> +++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
>> @@ -1413,6 +1413,8 @@ static int igb_intr_test(struct igb_adapter *adapter, u64 *data)
>>   			*data = 1;
>>   			return -1;
>>   		}
>> +		wr32(E1000_IVAR_MISC, E1000_IVAR_VALID << 8);
>> +		wr32(E1000_EIMS, BIT(0));
>>   	} else if (adapter->flags & IGB_FLAG_HAS_MSI) {
>>   		shared_int = false;
>>   		if (request_irq(irq,
>> -- 
>> 2.38.1
>>