netdev - Re: [PATCH v5 4/5] net: rnpgbe: Add basic mbx

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Message-ID: <399be32e-5e11-479d-bd2a-bd75de0c2ff5@lunn.ch>
Date: Wed, 20 Aug 2025 22:30:17 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Dong Yibo <dong100@...se.com>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, horms@...nel.org,
	corbet@....net, gur.stavi@...wei.com, maddy@...ux.ibm.com,
	mpe@...erman.id.au, danishanwar@...com, lee@...ger.us,
	gongfan1@...wei.com, lorenzo@...nel.org, geert+renesas@...der.be,
	Parthiban.Veerasooran@...rochip.com, lukas.bulwahn@...hat.com,
	alexanderduyck@...com, richardcochran@...il.com,
	netdev@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/5] net: rnpgbe: Add basic mbx_fw support

> +int mucse_mbx_get_capability(struct mucse_hw *hw)
> +{
> +	struct hw_abilities ability = {};
> +	int try_cnt = 3;
> +	int err = -EIO;
> +
> +	while (try_cnt--) {
> +		err = mucse_fw_get_capability(hw, &ability);
> +		if (err)
> +			continue;
> +		hw->pfvfnum = le16_to_cpu(ability.pfnum);
> +		hw->fw_version = le32_to_cpu(ability.fw_version);
> +		hw->usecstocount = le32_to_cpu(ability.axi_mhz);

If you can get it from the hardware, why do you need to initialise it
in the earlier patch?

I guess you have a bootstrap problem, you need it to get it. But
cannot you just initialise it to a single pessimistic value which will
work well enough for all hardware variants until you can actually ask
the hardware?

    Andrew