netdev - Re: [PATCH net-next v3 2/4] octeon_ep: PF-VF mailbox version support

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Date: Mon, 11 Dec 2023 10:46:52 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Shinas Rasheed <srasheed@...vell.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, hgani@...vell.com,
	vimleshk@...vell.com, egallen@...hat.com, mschmidt@...hat.com,
	pabeni@...hat.com, horms@...nel.org, kuba@...nel.org,
	davem@...emloft.net, wizhao@...hat.com, kheib@...hat.com,
	konguyen@...hat.com, Veerasenareddy Burru <vburru@...vell.com>,
	Sathesh Edara <sedara@...vell.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next v3 2/4] octeon_ep: PF-VF mailbox version support

On Sun, Dec 10, 2023 at 10:33:53PM -0800, Shinas Rasheed wrote:
> Add PF-VF mailbox initial version support
> 
> Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
> ---

<...>

> @@ -28,10 +28,18 @@ static void octep_pfvf_validate_version(struct octep_device *oct,  u32 vf_id,
>  {
>  	u32 vf_version = (u32)cmd.s_version.version;
>  
> -	if (vf_version <= OCTEP_PFVF_MBOX_VERSION_V1)
> -		rsp->s_version.type = OCTEP_PFVF_MBOX_TYPE_RSP_ACK;
> +	dev_dbg(&oct->pdev->dev, "VF id:%d VF version:%d PF version:%d\n",
> +		vf_id, vf_version, OCTEP_PFVF_MBOX_VERSION_CURRENT);
> +	if (vf_version < OCTEP_PFVF_MBOX_VERSION_CURRENT)
> +		rsp->s_version.version = vf_version;
>  	else
> -		rsp->s_version.type = OCTEP_PFVF_MBOX_TYPE_RSP_NACK;
> +		rsp->s_version.version = OCTEP_PFVF_MBOX_VERSION_CURRENT;
> +
> +	oct->vf_info[vf_id].mbox_version = rsp->s_version.version;
> +	dev_dbg(&oct->pdev->dev, "VF id:%d negotiated VF version:%d\n",
> +		vf_id, oct->vf_info[vf_id].mbox_version);
> +
> +	rsp->s_version.type = OCTEP_PFVF_MBOX_TYPE_RSP_ACK;
>  }

<...>

> +#define OCTEP_PFVF_MBOX_VERSION_CURRENT	OCTEP_PFVF_MBOX_VERSION_V1

This architecture design is unlikely to work in the real world unless
you control both PF and VF environment. Mostly PF is running some old
legacy distribution while VFs run more modern OS and this check will
prevent to run new driver in VF.

Thanks