netdev - Re: [PATCH v3 4/5] net: rnpgbe: Add basic mbx

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Message-ID: <9A6132D78B40DAFD+20250813095214.GA979548@nic-Precision-5820-Tower>
Date: Wed, 13 Aug 2025 17:52:14 +0800
From: Yibo Dong <dong100@...se.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
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 v3 4/5] net: rnpgbe: Add basic mbx_fw support

On Tue, Aug 12, 2025 at 05:14:15PM +0100, Vadim Fedorenko wrote:
> On 12/08/2025 10:39, Dong Yibo wrote:
> > Initialize basic mbx_fw ops, such as get_capability, reset phy
> > and so on.
> > 
> > Signed-off-by: Dong Yibo <dong100@...se.com>
> > +static int mucse_fw_send_cmd_wait(struct mucse_hw *hw,
> > +				  struct mbx_fw_cmd_req *req,
> > +				  struct mbx_fw_cmd_reply *reply)
> > +{
> > +	int len = le16_to_cpu(req->datalen) + MBX_REQ_HDR_LEN;
> > +	int retry_cnt = 3;
> > +	int err;
> > +
> > +	err = mutex_lock_interruptible(&hw->mbx.lock);
> > +	if (err)
> > +		return err;
> > +	err = hw->mbx.ops->write_posted(hw, (u32 *)req,
> > +					L_WD(len));
> > +	if (err) {> +		mutex_unlock(&hw->mbx.lock);
> > +		return err;
> > +	}
> 
> it might look a bit cleaner if you add error label and have unlock code
> once in the end of the function...
> 

If it is more cleaner bellow?

static int mucse_fw_send_cmd_wait(struct mucse_hw *hw,
                                  struct mbx_fw_cmd_req *req,
                                  struct mbx_fw_cmd_reply *reply)
{
        int len = le16_to_cpu(req->datalen) + MBX_REQ_HDR_LEN;
        int retry_cnt = 3;
        int err;

        err = mutex_lock_interruptible(&hw->mbx.lock);
        if (err)
                return err;
        err = hw->mbx.ops->write_posted(hw, (u32 *)req,
                                        L_WD(len));
        if (err)
                goto quit;
        do {
                err = hw->mbx.ops->read_posted(hw, (u32 *)reply,
                                               L_WD(sizeof(*reply)));
                if (err)
                        goto quit;
        } while (--retry_cnt >= 0 && reply->opcode != req->opcode);

        mutex_unlock(&hw->mbx.lock);
        if (retry_cnt < 0)
                return -ETIMEDOUT;
        if (reply->error_code)
                return -EIO;
        return 0;
quit:
        mutex_unlock(&hw->mbx.lock);
        return err;
}