netdev - Re: [PATCH net-next 2/2] net: hns3: add vf fault process in hns3 ras

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Date:   Tue, 17 Jan 2023 09:04:52 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Hao Lan <lanhao@...wei.com>, kuba@...nel.org,
        Leon Romanovsky <leon@...nel.org>
Cc:     yisen.zhuang@...wei.com, salil.mehta@...wei.com,
        edumazet@...gle.com, richardcochran@...il.com,
        shenjian15@...wei.com, wangjie125@...wei.com,
        netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH net-next 2/2] net: hns3: add vf fault process in hns3 ras

Hello,

On Fri, 2023-01-13 at 10:08 +0800, Hao Lan wrote:
[...]

> +static void hclge_get_vf_fault_bitmap(struct hclge_desc *desc,
> +				      unsigned long *bitmap)
> +{
> +#define HCLGE_FIR_FAULT_BYTES	24
> +#define HCLGE_SEC_FAULT_BYTES	8
> +
> +	u8 *buff;
> +
> +	memcpy(bitmap, desc[0].data, HCLGE_FIR_FAULT_BYTES);
> +	buff = (u8 *)bitmap + HCLGE_FIR_FAULT_BYTES;
> +	memcpy(buff, desc[1].data, HCLGE_SEC_FAULT_BYTES);
> +}

The above works under the assumption that:

	HCLGE_FIR_FAULT_BYTES + HCLGE_SEC_FAULT_BYTES == BITS_TO_BYTES(HCLGE_VPORT_NUM)

I think it's better to enforce such condition at build time with a
BUILD_BUG_ON(), to avoid future issues.

Also I think Leon still deserve a reply to one of his questions,
specifically: What will happen (at recovery time) with driver bound to
this VF?

Thanks!

Paolo