netdev - Re: [PATCH v3] stmmac: enable rx queues

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Date:   Wed, 28 Dec 2016 11:53:43 +0000
From:   Joao Pinto <Joao.Pinto@...opsys.com>
To:     Kishan Sandeep <sandeepkishan108@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>
CC:     <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v3] stmmac: enable rx queues

Hello,

Às 11:50 AM de 12/28/2016, Kishan Sandeep escreveu:
> On Wed, Dec 28, 2016 at 4:45 PM, Joao Pinto <Joao.Pinto@...opsys.com> wrote:
> 
>> When the hardware is synthesized with multiple queues, all queues are
>> disabled for default. This patch adds the rx queues configuration.
>> This patch was successfully tested in a Synopsys QoS Reference design.
>>
>> Signed-off-by: Joao Pinto <jpinto@...opsys.com>
>> ---
>> changes v2 -> v3 (Seraphin Bonnaffe):
>> - GMAC_RX_QUEUE_CLEAR macro simplified
>> changes v1 -> v2 (Niklas Cassel and Seraphin Bonnaffe):
>> - Instead of using number of DMA channels, lets use number of queues
>> - Create 2 flavors of RX queue enable Macros: AV and DCB (AV by default)
>> - Make sure that the RX queue related bits are cleared before setting
>> - Check if rx_queue_enable is available before executing
>>
>>  drivers/net/ethernet/stmicro/stmmac/common.h      |  5 +++++
>>  drivers/net/ethernet/stmicro/stmmac/dwmac4.h      |  8 ++++++++
>>  drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 12 ++++++++++++
>>  drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c  |  5 +++++
>>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 22
>> ++++++++++++++++++++++
>>  5 files changed, 52 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h
>> b/drivers/net/ethernet/stmicro/stmmac/common.h
>> index b13a144..6c96291 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/common.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/common.h
>> @@ -323,6 +323,9 @@ struct dma_features {
>>         /* TX and RX number of channels */
>>         unsigned int number_rx_channel;
>>         unsigned int number_tx_channel;
>> +       /* TX and RX number of queues */
>> +       unsigned int number_rx_queues;
>> +       unsigned int number_tx_queues;
>>
> 
> Looks like this variable is unused. Current driver is only supporting
> single Tx channel/queue. ??  Is current driver not supporting
> multichannel/multiqueue ?

stmmac has a good base for multichannel / multiple queue support, but is only
using 1 for now. My next task is to add complete multiple queues / channel to
stmmac amd that is why number of tx queues is being available.

Thanks!

> 
> Thanks!
>