netdev - Re: [PATCH v2 6/6] nfp: Use pci_get

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Date:   Mon, 2 Mar 2020 19:40:44 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     linux-pci@...r.kernel.org, netdev@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH v2 6/6] nfp: Use pci_get_dsn()

On Mon,  2 Mar 2020 18:25:05 -0800 Jacob Keller wrote:
> Use the newly added pci_get_dsn() function for obtaining the 64-bit
> Device Serial Number in the nfp6000_read_serial and
> nfp_6000_get_interface functions.
> 
> pci_get_dsn() reports the Device Serial number as a u64 value created by
> combining two pci_read_config_dword functions. The lower 16 bits
> represent the device interface value, and the next 48 bits represent the
> serial value. Use put_unaligned_be32 and put_unaligned_be16 to convert
> the serial value portion into a Big Endian formatted serial u8 array.
> 
> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> Cc: Jakub Kicinski <kuba@...nel.org>

Reviewed-by: Jakub Kicinski <kuba@...nel.org>

Thanks!

> -	pci_read_config_dword(pdev, pos + 4, &reg);
> -	put_unaligned_be16(reg >> 16, serial + 4);
> -	pci_read_config_dword(pdev, pos + 8, &reg);
> -	put_unaligned_be32(reg, serial);
> +	put_unaligned_be32((u32)(dsn >> 32), serial);
> +	put_unaligned_be16((u16)(dsn >> 16), serial + 4);

nit: the casts and extra brackets should be unnecessary, in case
     you're respinning..