linux-kernel - Re: [PATCH v3 5/5] net: rnpgbe: Add register

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Message-ID: <94eeae65-0e4b-45ef-a9c0-6bc8d37ae789@ti.com>
Date: Wed, 13 Aug 2025 13:56:07 +0530
From: MD Danish Anwar <danishanwar@...com>
To: Dong Yibo <dong100@...se.com>, <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>,
        <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>
CC: <netdev@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/5] net: rnpgbe: Add register_netdev



On 12/08/25 3:09 pm, Dong Yibo wrote:
> Initialize get mac from hw, register the netdev.
> 
> Signed-off-by: Dong Yibo <dong100@...se.com>
> ---
>  drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h    | 22 ++++++
>  .../net/ethernet/mucse/rnpgbe/rnpgbe_chip.c   | 73 ++++++++++++++++++
>  drivers/net/ethernet/mucse/rnpgbe/rnpgbe_hw.h |  1 +
>  .../net/ethernet/mucse/rnpgbe/rnpgbe_main.c   | 76 +++++++++++++++++++
>  4 files changed, 172 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h
> index 6cb14b79cbfe..644b8c85c29d 100644
> --- a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h
> +++ b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe.h
> @@ -6,6 +6,7 @@
>  
>  #include <linux/types.h>
>  #include <linux/mutex.h>
> +#include <linux/netdevice.h>
>  
>  extern const struct rnpgbe_info rnpgbe_n500_info;
>  extern const struct rnpgbe_info rnpgbe_n210_info;
> @@ -86,6 +87,18 @@ struct mucse_mbx_info {
>  	u32 fw2pf_mbox_vec;
>  };
>  
> +struct mucse_hw_operations {
> +	int (*init_hw)(struct mucse_hw *hw);
> +	int (*reset_hw)(struct mucse_hw *hw);
> +	void (*start_hw)(struct mucse_hw *hw);
> +	void (*init_rx_addrs)(struct mucse_hw *hw);
> +	void (*driver_status)(struct mucse_hw *hw, bool enable, int mode);
> +};

You define functions init_hw, start_hw, and init_rx_addrs in this
structure but they aren't implemented in this patch. Either implement
them or remove them if not needed yet.


> +
> +enum {
> +	mucse_driver_insmod,
> +};
> +
>  struct mucse_hw {
>  	void *back;
>  	u8 pfvfnum;
> @@ -96,12 +109,18 @@ struct mucse_hw {
>  	u32 axi_mhz;
>  	u32 bd_uid;
>  	enum rnpgbe_hw_type hw_type;
> +	const struct mucse_hw_operations *ops;
>  	struct mucse_dma_info dma;
>  	struct mucse_eth_info eth;
>  	struct mucse_mac_info mac;
>  	struct mucse_mbx_info mbx;
> +	u32 flags;
> +#define M_FLAGS_INIT_MAC_ADDRESS BIT(0)
>  	u32 driver_version;
>  	u16 usecstocount;
> +	int lane;
> +	u8 addr[ETH_ALEN];
> +	u8 perm_addr[ETH_ALEN];
>  };
>  
>  struct mucse {
> @@ -123,4 +142,7 @@ struct rnpgbe_info {
>  #define PCI_DEVICE_ID_N500_DUAL_PORT 0x8318
>  #define PCI_DEVICE_ID_N210 0x8208
>  #define PCI_DEVICE_ID_N210L 0x820a
> +
> +#define dma_wr32(dma, reg, val) writel((val), (dma)->dma_base_addr + (reg))
> +#define dma_rd32(dma, reg) readl((dma)->dma_base_addr + (reg))
>  #endif /* _RNPGBE_H */
> diff --git a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_chip.c b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_chip.c
> index 16d0a76114b5..3eaa0257f3bb 100644
> --- a/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_chip.c
> +++ b/drivers/net/ethernet/mucse/rnpgbe/rnpgbe_chip.c
> @@ -2,10 +2,82 @@
>  /* Copyright(c) 2020 - 2025 Mucse Corporation. */
>  
>  #include <linux/string.h>
> +#include <linux/etherdevice.h>
>  
>  #include "rnpgbe.h"
>  #include "rnpgbe_hw.h"
>  #include "rnpgbe_mbx.h"
> +#include "rnpgbe_mbx_fw.h"
> +
> +/**
> + * rnpgbe_get_permanent_mac - Get permanent mac
> + * @hw: hw information structure
> + * @mac_addr: pointer to store mac
> + *
> + * rnpgbe_get_permanent_mac tries to get mac from hw.
> + * It use eth_random_addr if failed.
> + **/
> +static void rnpgbe_get_permanent_mac(struct mucse_hw *hw,
> +				     u8 *mac_addr)
> +{
> +	if (mucse_fw_get_macaddr(hw, hw->pfvfnum, mac_addr, hw->lane)) {
> +		eth_random_addr(mac_addr);
> +	} else {
> +		if (!is_valid_ether_addr(mac_addr))
> +			eth_random_addr(mac_addr);
> +	}
> +

The function should log a warning when falling back to a random MAC
address, especially in the second case where the hardware returned an
invalid MAC.

> +	hw->flags |= M_FLAGS_INIT_MAC_ADDRESS;
> +}
> +

> +/**
> + * rnpgbe_xmit_frame - Send a skb to driver
> + * @skb: skb structure to be sent
> + * @netdev: network interface device structure
> + *
> + * @return: NETDEV_TX_OK or NETDEV_TX_BUSY
> + **/
> +static netdev_tx_t rnpgbe_xmit_frame(struct sk_buff *skb,
> +				     struct net_device *netdev)
> +{
> +		dev_kfree_skb_any(skb);
> +		return NETDEV_TX_OK;
> +}

Extra indentation on these two lines. Also, the function just drops all
packets without any actual transmission. This should at least increment
the drop counter statistics.

> +
> +static const struct net_device_ops rnpgbe_netdev_ops = {
> +	.ndo_open = rnpgbe_open,
> +	.ndo_stop = rnpgbe_close,
> +	.ndo_start_xmit = rnpgbe_xmit_frame,
> +};


-- 
Thanks and Regards,
Danish