[Intel-wired-lan] [PATCH] intel: ice: Do not enable NAPI on q_vectors that have no rings

[Yang Xiao <YangX92@hotmail.com>]

Sorry for the copy-and-paste error, I will submit a new patch.


Young

On 2018/11/29 3:43, Jeff Kirsher wrote:
> On Wed, 2018-11-28 at 12:24 +0000, Yang Xiao wrote:
>> From: Young Xiao <YangX92@hotmail.com>
>>
>> If ice driver has q_vectors w/ active NAPI that has no rings,
>> then this will result in a divide by zero error. To correct it
>> I am updating the driver code so that we only support NAPI on
>> q_vectors that have 1 or more rings allocated to them.
>>
>> See commit 13a8cd191a2b ("i40e: Do not enable NAPI on q_vectors
>> that have no rings") for detail.
>>
>> Signed-off-by: Young Xiao <YangX92@hotmail.com>
>> ---
>>   drivers/net/ethernet/intel/ice/ice_main.c | 16 ++++++++++++----
>>   1 file changed, 12 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c
>> b/drivers/net/ethernet/intel/ice/ice_main.c
>> index 333312a..9cc988a 100644
>> --- a/drivers/net/ethernet/intel/ice/ice_main.c
>> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
>> @@ -2563,8 +2563,12 @@ static void ice_napi_enable_all(struct ice_vsi
>> *vsi)
>>   	if (!vsi->netdev)
>>   		return;
>>   
>> -	for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++)
>> -		napi_enable(&vsi->q_vectors[q_idx]->napi);
>> +	for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++) {
>> +		struct ice_q_vector *q_vector = vsi->q_vectors[q_idx];
>> +
>> +		if (q_vector->rx.ring || q_vector->tx.ring)
>> +			napi_enable(&q_vector->napi);
>> +	}
>>   }
>>   
>>   /**
>> @@ -2931,8 +2935,12 @@ static void ice_napi_disable_all(struct
>> ice_vsi *vsi)
>>   	if (!vsi->netdev)
>>   		return;
>>   
>> -	for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++)
>> -		napi_disable(&vsi->q_vectors[q_idx]->napi);
>> +	for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++) {
>> +		struct ice_q_vector *q_vector = vsi->q_vectors[q_idx];
>> +
>> +		if (q_vector->rx.ring || q_vector->tx.ring)
>> +			napi_enable(&q_vector->napi);
> Looks like a cut and paste error, you should be 'disabling' NAPI, not
> enabling it here.
>
>> +	}
>>   }
>>   
>>   /**