netdev - Re: [PATCH 2/2] Do not set shared_ports when nreq > MAX

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Date:	Tue, 6 Oct 2015 16:46:06 -0500
From:	Carol Soto <clsoto@...ux.vnet.ibm.com>
To:	Or Gerlitz <gerlitz.or@...il.com>,
	Matan Barak <matanb@...lanox.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Or Gerlitz <ogerlitz@...lanox.com>, brking@...ux.vnet.ibm.com
Subject: Re: [PATCH 2/2] Do not set shared_ports when nreq > MAX_MSIX



On 10/6/2015 4:39 PM, Or Gerlitz wrote:
> On Wed, Oct 7, 2015 at 12:27 AM,  <clsoto@...ux.vnet.ibm.com> wrote:
>> From: Carol L Soto <clsoto@...ux.vnet.ibm.com>
>>
>> If we get MAX_MSIX interrupts would like to have each receive ring
>> with his own msix interrupt line.
> so 9293267a3e2a  was only partially correct? and/or not fully optimal?
> please elaborate more on that in your change log.
just not fully optimal, with commit 9293267a3e2a if I have 64 MSIXs and 
2 ports I can get 8 rings for each port but then the rings will share 
the interrupt lines. For 64 MSIXs we can have each ring with his own 
interrupt line.

>> Fixes: 9293267a3e2a ('net/mlx4_core: Capping number of requested MSIXs to MAX_MSIX')
>> Signed-off-by: Carol L Soto <clsoto@...ux.vnet.ibm.com>
> Carol, you didn't use net/mlx4: prefix as ask for mlx4 driver patch
> titles, so please repost, but before that I'd like to see an ack from
> Matan for this patch as well.
Sorry completely missed it. When Matan acks will resend it.
>
> Or.
>
>> ---
>>   drivers/net/ethernet/mellanox/mlx4/main.c | 4 +---
>>   1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
>> index 006757f..f03f513 100644
>> --- a/drivers/net/ethernet/mellanox/mlx4/main.c
>> +++ b/drivers/net/ethernet/mellanox/mlx4/main.c
>> @@ -2673,10 +2673,8 @@ static void mlx4_enable_msi_x(struct mlx4_dev *dev)
>>
>>                  nreq = min_t(int, dev->caps.num_eqs - dev->caps.reserved_eqs,
>>                               nreq);
>> -               if (nreq > MAX_MSIX) {
>> +               if (nreq > MAX_MSIX)
>>                          nreq = MAX_MSIX;
>> -                       shared_ports = true;
>> -               }
>>
>>                  entries = kcalloc(nreq, sizeof *entries, GFP_KERNEL);
>>                  if (!entries)
>> --
>> 1.8.3.1
>>
>> --
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