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 17:11:08 +0000
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Esben Haabendal <esben@...nix.com>, 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>
Cc: 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

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.

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