linux-kernel - RE: [RFC net-next 1/5] net: stmmac: introduce IEEE 802.1Qbv configuration functionalities

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Date:   Thu, 27 Jun 2019 12:21:11 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Voon Weifeng <weifeng.voon@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Giuseppe Cavallaro" <peppe.cavallaro@...com>,
        Andrew Lunn <andrew@...n.ch>,
        "Florian Fainelli" <f.fainelli@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>
Subject: RE: [RFC net-next 1/5] net: stmmac: introduce IEEE 802.1Qbv
 configuration functionalities

From: Voon Weifeng <weifeng.voon@...el.com>

> diff --git a/drivers/net/ethernet/stmicro/stmmac/dw_tsn_lib.c b/drivers/net/ethernet/stmicro/stmmac/dw_tsn_lib.c
> new file mode 100644
> index 000000000000..cba27c604cb1
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dw_tsn_lib.c

XGMAC also supports TSN features so I think more abstraction is needed 
on this because the XGMAC implementation is very similar (only reg 
offsets and bitfields changes).

I would rather:
	- Implement HW specific handling in dwmac4_core.c / dwmac4_dma.c and 
add the callbacks in hwif table;
	- Let TSN logic in this file but call it stmmac_tsn.c.

> @@ -3621,6 +3622,8 @@ static int stmmac_set_features(struct net_device *netdev,
>  	 */
>  	stmmac_rx_ipc(priv, priv->hw);
>  
> +	netdev->features = features;

Isn't this a fix ?