linux-kernel - Re: [PATCH V2 net 03/20] net/ena: fix queues number calculation

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Message-ID: <73d7e724-c251-ff46-49f1-4525478b7bb5@annapurnalabs.com>
Date:   Mon, 5 Dec 2016 20:25:30 +0200
From:   Netanel Belgazal <netanel@...apurnalabs.com>
To:     Matt Wilson <msw@...n.com>
Cc:     linux-kernel@...r.kernel.org, davem@...emloft.net,
        netdev@...r.kernel.org, dwmw@...zon.com, zorik@...apurnalabs.com,
        alex@...apurnalabs.com, saeed@...apurnalabs.com, msw@...zon.com,
        aliguori@...zon.com, nafea@...apurnalabs.com
Subject: Re: [PATCH V2 net 03/20] net/ena: fix queues number calculation


On 12/05/2016 06:11 AM, Matt Wilson wrote:
> On Sun, Dec 04, 2016 at 03:19:21PM +0200, Netanel Belgazal wrote:
>> The ENA driver tries to open a queue per vCPU.
>> To determine how many vCPUs the instance have it uses num_possible_cpus
>> while it should have use num_online_cpus instead.
> use () when referring to functions: num_possible_cpus(), num_online_cpus().

Ack
>
>> Signed-off-by: Netanel Belgazal <netanel@...apurnalabs.com>
> Reviewed-by: Matt Wilson <msw@...zon.com>
>
>> ---
>>   drivers/net/ethernet/amazon/ena/ena_netdev.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
>> index 397c9bc..224302c 100644
>> --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
>> +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
>> @@ -2667,7 +2667,7 @@ static int ena_calc_io_queue_num(struct pci_dev *pdev,
>>   		io_sq_num = get_feat_ctx->max_queues.max_sq_num;
>>   	}
>>   
>> -	io_queue_num = min_t(int, num_possible_cpus(), ENA_MAX_NUM_IO_QUEUES);
>> +	io_queue_num = min_t(int, num_online_cpus(), ENA_MAX_NUM_IO_QUEUES);
>>   	io_queue_num = min_t(int, io_queue_num, io_sq_num);
>>   	io_queue_num = min_t(int, io_queue_num,
>>   			     get_feat_ctx->max_queues.max_cq_num);