linux-kernel - Re: [PATCH v3 2/5] net: rnpgbe: Add n500/n210 chip support

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Message-ID: <7AD2F2D5BC45498D+20250813070155.GC944516@nic-Precision-5820-Tower>
Date: Wed, 13 Aug 2025 15:01:55 +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 2/5] net: rnpgbe: Add n500/n210 chip support

On Tue, Aug 12, 2025 at 04:49:33PM +0100, Vadim Fedorenko wrote:
> > +struct mucse_dma_info {
> > +	void __iomem *dma_base_addr;
> > +	void __iomem *dma_ring_addr;
> > +	void *back;
> 
> it might be better to keep the type of back pointer and give it
> a bit more meaningful name ...
> 
> > +	u32 dma_version;
> > +};
> > +
> > +struct mucse_eth_info {
> > +	void __iomem *eth_base_addr;
> > +	void *back;
> 
> .. here ...
> 
> > +};
> > +
> > +struct mucse_mac_info {
> > +	void __iomem *mac_addr;
> > +	void *back;
> 
> and here...
> 
> > +};
> > +
> > +struct mucse_mbx_info {
> > +	/* fw <--> pf mbx */
> > +	u32 fw_pf_shm_base;
> > +	u32 pf2fw_mbox_ctrl;
> > +	u32 pf2fw_mbox_mask;
> > +	u32 fw_pf_mbox_mask;
> > +	u32 fw2pf_mbox_vec;
> > +};
> > +
> > +struct mucse_hw {
> > +	void *back;
> 
> you can also use container_of() as all these structures are embedded and
> simple pointer math can give you proper result.
> 

Got it, I will use container_of(), and remove the '*back' define.
Maybe eth to hw like this:
#define eth_to_hw(eth) container_of(eth, struct rnpgbe_hw, eth)
It is ok?

> > +	void __iomem *hw_addr;
> > +	void __iomem *ring_msix_base;
> > +	struct pci_dev *pdev;
> > +	enum rnpgbe_hw_type hw_type;
> > +	struct mucse_dma_info dma;
> > +	struct mucse_eth_info eth;
> > +	struct mucse_mac_info mac;
> > +	struct mucse_mbx_info mbx;
> > +	u32 driver_version;
> > +	u16 usecstocount;
> > +};
> > +
> >   struct mucse {
> >   	struct net_device *netdev;
> >   	struct pci_dev *pdev;
> > +	struct mucse_hw hw;
> >   	u16 bd_number;
> >   };
> 
> [...]
> 
> > +/**
> > + * rnpgbe_add_adapter - Add netdev for this pci_dev
> > + * @pdev: PCI device information structure
> > + * @info: chip info structure
> > + *
> > + * rnpgbe_add_adapter initializes a netdev for this pci_dev
> > + * structure. Initializes Bar map, private structure, and a
> > + * hardware reset occur.
> > + *
> > + * @return: 0 on success, negative on failure
> > + **/
> > +static int rnpgbe_add_adapter(struct pci_dev *pdev,
> > +			      const struct rnpgbe_info *info)
> > +{
> > +	struct net_device *netdev;
> > +	void __iomem *hw_addr;
> > +	static int bd_number;
> 
> it's not clear from the patchset why do you need this static variable...
> 

Ok, bd_number seems no usefull, I will remove it.

> > +	struct mucse *mucse;
> > +	struct mucse_hw *hw;
> > +	u32 dma_version = 0;
> > +	u32 queues;
> > +	int err;
> > +
> > +	queues = info->total_queue_pair_cnts;
> > +	netdev = alloc_etherdev_mq(sizeof(struct mucse), queues);
> > +	if (!netdev)
> > +		return -ENOMEM;
> > +
> > +	SET_NETDEV_DEV(netdev, &pdev->dev);
> > +	mucse = netdev_priv(netdev);
> > +	mucse->netdev = netdev;
> > +	mucse->pdev = pdev;
> > +	mucse->bd_number = bd_number++;
> 
> ... but this code is racy by design
> 
> > +	pci_set_drvdata(pdev, mucse);
> > +
> > +	hw = &mucse->hw;
> > +	hw->back = mucse;
> > +	hw->hw_type = info->hw_type;
> > +	hw->pdev = pdev;
> > +
> 

Thanks for your feedback.