linux-kernel - Re: [PATCH net-next 4/6] net: ethernet: mtk_eth_soc: implement multi-queue support for per-port queues

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Date:   Fri, 18 Nov 2022 15:13:31 +0000
From:   Alexander 'lynxis' Couzens <lynxis@...0.eu>
To:     Felix Fietkau <nbd@....name>
Cc:     netdev@...r.kernel.org, John Crispin <john@...ozen.org>,
        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>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 4/6] net: ethernet: mtk_eth_soc: implement
 multi-queue support for per-port queues

Hi Felix,

On Wed, 16 Nov 2022 09:07:32 +0100
Felix Fietkau <nbd@....name> wrote:

> @@ -614,6 +618,75 @@ static void mtk_mac_link_down(struct phylink_config *config, unsigned int mode,
>  	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
>  }
>  
> +static void mtk_set_queue_speed(struct mtk_eth *eth, unsigned int idx,
> +				int speed)
> +{
> +	const struct mtk_soc_data *soc = eth->soc;
> +	u32 ofs, val;
> +
> +	if (!MTK_HAS_CAPS(soc->caps, MTK_QDMA))
> +		return;
> +
> +	val = MTK_QTX_SCH_MIN_RATE_EN |
> +	      /* minimum: 10 Mbps */
> +	      FIELD_PREP(MTK_QTX_SCH_MIN_RATE_MAN, 1) |
> +	      FIELD_PREP(MTK_QTX_SCH_MIN_RATE_EXP, 4) |
> +	      MTK_QTX_SCH_LEAKY_BUCKET_SIZE;
> +	if (!MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2))
> +		val |= MTK_QTX_SCH_LEAKY_BUCKET_EN;
> +
> +	if (IS_ENABLED(CONFIG_SOC_MT7621)) {
> +		switch (speed) {
> +		case SPEED_10:
> +			val |= MTK_QTX_SCH_MAX_RATE_EN |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_MAN, 103) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_EXP, 2) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_WEIGHT, 1);
> +			break;
> +		case SPEED_100:
> +			val |= MTK_QTX_SCH_MAX_RATE_EN |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_MAN, 103) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_EXP, 3);
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_WEIGHT, 1);
> +			break;
> +		case SPEED_1000:
> +			val |= MTK_QTX_SCH_MAX_RATE_EN |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_MAN, 105) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_EXP, 4) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_WEIGHT, 10);
> +			break;
> +		default:
> +			break;
> +		}
> +	} else {
> +		switch (speed) {
> +		case SPEED_10:
> +			val |= MTK_QTX_SCH_MAX_RATE_EN |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_MAN, 1) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_EXP, 4) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_WEIGHT, 1);
> +			break;
> +		case SPEED_100:
> +			val |= MTK_QTX_SCH_MAX_RATE_EN |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_MAN, 1) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_EXP, 5);
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_WEIGHT, 1);
> +			break;
> +		case SPEED_1000:
> +			val |= MTK_QTX_SCH_MAX_RATE_EN |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_MAN, 10) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_EXP, 5) |
> +			       FIELD_PREP(MTK_QTX_SCH_MAX_RATE_WEIGHT, 10);
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +
> +	ofs = MTK_QTX_OFFSET * idx;
> +	mtk_w32(eth, val, soc->reg_map->qdma.qtx_sch + ofs);
> +}
> +
>  static void mtk_mac_link_up(struct phylink_config *config,
>  			    struct phy_device *phy,
>  			    unsigned int mode, phy_interface_t interface,
> @@ -639,6 +712,8 @@ static void mtk_mac_link_up(struct phylink_config *config,


What's happening to 2.5Gbit ports (e.g. on mt7622)? Should be SPEED_2500 also in the switch/case?
E.g. a direct connected 2.5Gbit phy to GMAC0.
Or a mt7622 GMAC0 to mt7531 port 6 and a 2.5Gbit phy to port 5.