linux-kernel - Re: [PATCH 2/2] net: stmmac: dwmac-imx: set TSO/TBS TX queues default settings

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Date: Thu, 25 Jan 2024 19:31:23 +0100
From: Esben Haabendal <esben@...nix.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: netdev@...r.kernel.org,  Alexandre Torgue
 <alexandre.torgue@...s.st.com>,  Jose Abreu <joabreu@...opsys.com>,
  "David S. Miller" <davem@...emloft.net>,  Eric Dumazet
 <edumazet@...gle.com>,  Jakub Kicinski <kuba@...nel.org>,  Paolo Abeni
 <pabeni@...hat.com>,  Maxime Coquelin <mcoquelin.stm32@...il.com>,  Shawn
 Guo <shawnguo@...nel.org>,  Sascha Hauer <s.hauer@...gutronix.de>,
  Pengutronix Kernel Team <kernel@...gutronix.de>,  Fabio Estevam
 <festevam@...il.com>,  NXP Linux Team <linux-imx@....com>,
  linux-arm-kernel@...ts.infradead.org,
  linux-stm32@...md-mailman.stormreply.com,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net: stmmac: dwmac-imx: set TSO/TBS TX queues
 default settings

Vadim Fedorenko <vadim.fedorenko@...ux.dev> writes:

> On 25/01/2024 12:34, Esben Haabendal wrote:
>> TSO and TBS cannot coexist. For now we set i.MX Ethernet QOS controller to use
>> TX queue with TSO and the rest for TBS.
>> TX queues with TBS can support etf qdisc hw offload.
>> Signed-off-by: Esben Haabendal <esben@...nix.com>
>> ---
>>   drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c | 6 ++++++
>>   1 file changed, 6 insertions(+)
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
>> b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
>> index 8f730ada71f9..c42e8f972833 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
>> @@ -353,6 +353,12 @@ static int imx_dwmac_probe(struct platform_device *pdev)
>>   	if (data->flags & STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY)
>>   		plat_dat->flags |= STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY;
>>   +        for (int i = 0; i < plat_dat->tx_queues_to_use; i++) {
>> +                /* Default TX Q0 to use TSO and rest TXQ for TBS */
>> +                if (i > 0)
>> +                        plat_dat->tx_queues_cfg[i].tbs_en = 1;
>> +        }
>> +
>
> Just wonder why don't you start with i = 1 and remove 'if' completely?
> Keeping comment in place will make it understandable.

No good reason for now. Later on, we might have some setup in the same
lop that also applies to Q0. But the init value can be changed at that
point.

>
>>   	plat_dat->host_dma_width = dwmac->ops->addr_width;
>>   	plat_dat->init = imx_dwmac_init;
>>   	plat_dat->exit = imx_dwmac_exit;