netdev - Re: [PATCH net-next 2] net: ngbe: sw init and hw init

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Date:   Tue, 6 Sep 2022 10:25:34 +0800
From:   "mengyuanlou@...-swift.com" <mengyuanlou@...-swift.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Jiawen Wu <jiawenwu@...stnetic.com>
Subject: Re: [PATCH net-next 2] net: ngbe: sw init and hw init

They are the same person。
<jiawenwu@...-swift.com>
<jiawenwu@...stnetic.com>
> 2022年9月6日 08:48，Andrew Lunn <andrew@...n.ch> 写道：
> 
>> +static void ngbe_get_mac_addr(struct ngbe_hw *hw, u8 *mac_addr)
>> +{
>> +	u32 rar_high;
>> +	u32 rar_low;
>> +	u16 i;
>> +
>> +	wr32(hw, NGBE_PSR_MAC_SWC_IDX, 0);
>> +	rar_high = rd32(hw, NGBE_PSR_MAC_SWC_AD_H);
>> +	rar_low = rd32(hw, NGBE_PSR_MAC_SWC_AD_L);
>> +
>> +	for (i = 0; i < 2; i++)
>> +		mac_addr[i] = (u8)(rar_high >> (1 - i) * 8);
>> +
>> +	for (i = 0; i < 4; i++)
>> +		mac_addr[i + 2] = (u8)(rar_low >> (3 - i) * 8);
>> +}
> 
> This looks identical to txgbe_get_mac_addr():
> 
> https://patchwork.kernel.org/project/netdevbpf/patch/20220830070454.146211-4-jiawenwu@trustnetic.com/
> 
> How similar is txgbe and ngdb? Should there be some shared code?

> 
>> +
>> +/**
>> + *  ngbe_validate_mac_addr - Validate MAC address
>> + *  @mac_addr: pointer to MAC address.
>> + *
>> + *  Tests a MAC address to ensure it is a valid Individual Address
>> + **/
>> +static int ngbe_validate_mac_addr(u8 *mac_addr)
>> +{
>> +	/* Make sure it is not a multicast address */
>> +	if (is_multicast_ether_addr(mac_addr))
>> +		return -EINVAL;
>> +	/* Not a broadcast address */
>> +	else if (is_broadcast_ether_addr(mac_addr))
>> +		return -EINVAL;
>> +	/* Reject the zero address */
>> +	else if (is_zero_ether_addr(mac_addr))
>> +		return -EINVAL;
>> +	return 0;
>> +}
>> +
>> +/**
>> + *  ngbe_set_rar - Set Rx address register
>> + *  @hw: pointer to hardware structure
>> + *  @index: Receive address register to write
>> + *  @addr: Address to put into receive address register
>> + *  @pools: "pool" index
>> + *  @enable_addr: set flag that address is active
>> + *
>> + *  Puts an ethernet address into a receive address register.
>> + **/
>> +static int ngbe_set_rar(struct ngbe_hw *hw, u32 index, u8 *addr, u64 pools,
>> +			u32 enable_addr)
>> +{
> 
> This function looks identical to txgbe_set_rar().
> 
>> +/**
>> + *  ngbe_init_rx_addrs - Initializes receive address filters.
>> + *  @hw: pointer to hardware structure
>> + *
>> + *  Places the MAC address in receive address register 0 and clears the rest
>> + *  of the receive address registers. Clears the multicast table. Assumes
>> + *  the receiver is in reset when the routine is called.
>> + **/
>> +static void ngbe_init_rx_addrs(struct ngbe_hw *hw)
>> +{
>> +	u32 i;
>> +	u32 rar_entries = hw->mac.num_rar_entries;
>> +	u32 psrctl;
> 
> Apart from txgbe_init_rx_addrs() uses is_valid_ether_addr(), this is
> also identical.
> 
>> +static int ngbe_fmgr_cmd_op(struct ngbe_hw *hw, u32 cmd, u32 cmd_addr)
>> +{
>> +	u32 cmd_val = 0, val = 0;
>> +
>> +	cmd_val = (cmd << NGBE_SPI_CLK_CMD_OFFSET) |
>> +		  (NGBE_SPI_CLK_DIV << NGBE_SPI_CLK_DIV_OFFSET) | cmd_addr;
>> +	wr32(hw, NGBE_SPI_H_CMD_REG_ADDR, cmd_val);
>> +
>> +	return read_poll_timeout(rd32, val, (val & 0x1), 10, NGBE_SPI_TIME_OUT_VALUE,
>> +				 false, hw, NGBE_SPI_H_STA_REG_ADDR);
>> +}
>> +
>> +int ngbe_flash_read_dword(struct ngbe_hw *hw, u32 addr, u32 *data)
>> +{
>> +	int ret = 0;
>> +
>> +	ret = ngbe_fmgr_cmd_op(hw, NGBE_SPI_CMD_READ_DWORD, addr);
>> +	if (ret < 0)
>> +		return ret;
>> +	*data = rd32(hw, NGBE_SPI_H_DAT_REG_ADDR);
>> +
>> +	return 0;
>> +}
> 
> Identical to txgbe_flash_read_dword
> 
> You need to work with Jiawen Wu <jiawe...@...stnetic.com> and pull the
> common code out into a library that the two drivers share. Is
> jiawenwu@...-swift.com the same person ?

Is it necessary to pull the common code out into a library?
There are some differences in register configuration.
It is not convenient for customers to use.
Thanks.

> 
>       Andrew
>