netdev - Re: [PATCH net-next] net: ethernet: mediatek: Allow gaps in MAC allocation

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Date: Tue, 2 Jul 2024 08:58:22 +0200
From: Przemek Kitszel <przemyslaw.kitszel@...el.com>
To: Daniel Golle <daniel@...rotopia.org>, Elad Yifee <eladwf@...il.com>
CC: Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>, Mark Lee
	<Mark-MC.Lee@...iatek.com>, Lorenzo Bianconi <lorenzo@...nel.org>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Matthias
 Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH net-next] net: ethernet: mediatek: Allow gaps in MAC
 allocation

On 7/1/24 21:28, Daniel Golle wrote:
> Some devices with MediaTek SoCs don't use the first but only the second
> MAC in the chip. Especially with MT7981 which got a built-in 1GE PHY
> connected to the second MAC this is quite common.
> Make sure to reset and enable PSE also in those cases by skipping gaps
> using 'continue' instead of aborting the loop using 'break'.
> 
> Fixes: dee4dd10c79a ("net: ethernet: mtk_eth_soc: ppe: add support for multiple PPEs")
> Suggested-by: Elad Yifee <eladwf@...il.com>
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
> Note that this should go to 'net-next' because the commit being fixed
> isn't yet part of the 'net' tree.

makes sense, and the fix is correct, so:
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>

> 
>   drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 13d78d9b3197..2529b5b607c8 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -3396,7 +3396,7 @@ static int mtk_open(struct net_device *dev)
>   
>   		for (i = 0; i < MTK_MAX_DEVS; i++) {
>   			if (!eth->netdev[i])
> -				break;
> +				continue;
>   
>   			target_mac = netdev_priv(eth->netdev[i]);
>   			if (!soc->offload_version) {


what about:
4733│ static int mtk_sgmii_init(struct mtk_eth *eth)
4734│ {
4735│         struct device_node *np;
4736│         struct regmap *regmap;
4737│         u32 flags;
4738│         int i;
4739│
4740│         for (i = 0; i < MTK_MAX_DEVS; i++) {
4741│                 np = of_parse_phandle(eth->dev->of_node, 
"mediatek,sgmiisys", i);
4742│                 if (!np)
4743│                         break;

should we also continue here?

4744│
4745│                 regmap = syscon_node_to_regmap(np);
4746│                 flags = 0;
4747│                 if (of_property_read_bool(np, "mediatek,pnswap"))
4748│                         flags |= MTK_SGMII_FLAG_PN_SWAP;
4749│
4750│                 of_node_put(np);
4751│
4752│                 if (IS_ERR(regmap))
4753│                         return PTR_ERR(regmap);
4754│
4755│                 eth->sgmii_pcs[i] = mtk_pcs_lynxi_create(eth->dev, 
regmap,
4756│ 
eth->soc->ana_rgc3,
4757│                                                          flags);
4758│         }
4759│
4760│         return 0;
4761│ }