netdev - Re: [PATCH 1/2] stmmac: introduce flag to dynamically disable TX offload for rockchip devices

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Date:   Mon, 01 Apr 2019 20:31:58 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     "Leonidas P. Papadakos" <papadakospan@...il.com>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] stmmac: introduce flag to dynamically disable TX offload for rockchip devices

Hi Leonidas,

Am Montag, 1. April 2019, 20:18:40 CEST schrieb Leonidas P. Papadakos:
> From: =?UTF-8?q?Kamil=20Trzci=C5=84ski?= <ayufan@...fan.eu>
> 
> Some rockchip boards exhibit an issue where tx checksumming does not work with
> packets larger than 1498.
> 
> This is bad for network stability.
> 
> The previous approach was using force_thresh_dma_mode in the board dts, which
> does more than we need.
> 
> Signed-off-by: Leonidas P. Papadakos <papadakospan@...il.com>

> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 3031f2bf1..807cf5826 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -519,6 +519,8 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
>  		pr_warn("force_sf_dma_mode is ignored if force_thresh_dma_mode is set.");
>  	}
>  
> +	plat->bugged_tx_coe = of_property_read_bool(np, "rockchip,bugged_tx_coe");
> +

you're adding a new devicetree property, so please
(1) also update the binding doc in
    Documentation/devicetree/bindings/net/rockchip-dwmac.txt
(2) Cc devicetree maintainers and lists (via get_maintainer.pl once
    you've added the binding change) to let them look at it.


Thanks
Heiko

>  	of_property_read_u32(np, "snps,ps-speed", &plat->mac_port_sel_speed);
>  
>  	plat->axi = stmmac_axi_setup(pdev);
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index 4335bd771..60c411f43 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -162,6 +162,7 @@ struct plat_stmmacenet_data {
>  	int pmt;
>  	int force_sf_dma_mode;
>  	int force_thresh_dma_mode;
> +	int bugged_tx_coe;
>  	int riwt_off;
>  	int max_speed;
>  	int maxmtu;
>