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Date:   Thu, 26 Oct 2023 10:55:10 -0700
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Subject: Re: [PATCH net-next 4/5] net: phy: broadcom: Add support for
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To:     Vincent MAILHOL <mailhol.vincent@wanadoo.fr>
Cc:     netdev@vger.kernel.org, Doug Berger <opendmb@gmail.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@broadcom.com>,
        "David S. Miller" <davem@davemloft.net>,
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From:   Florian Fainelli <florian.fainelli@broadcom.com>
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Hi Vincent,

On 10/25/23 19:13, Vincent MAILHOL wrote:
[snip]
>>
>> This looks like an endianness conversion (I can not tell if this is
>> big to little or the opposite)...
> 
> Oopsy! On second look, this is an open coded cpu to big endian
> conversion. So the question I should have asked is:
> 
>    why not use the put_unaligned_be16() helper here?

Because this is consistent with the existing code, though I will keep 
that suggestion in mind as a subsequent patch. I personally find it 
clearer expressed that way, but can update.

> 
> Below comments still remain.
> 
>>> +       }
>>> +       ether_addr_copy(nfc->fs.h_u.ether_spec.h_dest, da);
>>> +
>>> +       for (i = 0; i < sizeof(da) / 2; i++) {
>>> +               ret = bcm_phy_read_exp(phydev,
>>> +                                      BCM54XX_WOL_MASK(2 - i));
>>> +               if (ret < 0)
>>> +                       return ret;
>>> +
>>> +               da[i * 2] = ~(ret >> 8);
>>> +               da[i * 2 + 1] = ~(ret & 0xff);
>>> +       }
>>> +       ether_addr_copy(nfc->fs.m_u.ether_spec.h_dest, da);
>>> +
>>> +       ret = bcm_phy_read_exp(phydev, BCM54XX_WOL_INNER_PROTO);
>>> +       if (ret < 0)
>>> +               return ret;
>>> +
>>> +       nfc->fs.h_u.ether_spec.h_proto = be16_to_cpu(ret);
>>
>> ... but here it is big endian to cpu endian? It does not look coherent.

You are right, it was not consistent.

>>
>> Also, did you run parse to check your endianness conversions?

I did, though nothing came out with C=1 or C=2, I might have to check 
that separately.

>>
>>    https://www.kernel.org/doc/html/latest/dev-tools/sparse.html
>>
>> For example, I would have expected htons() (a.k.a. cpu_to_be16())
>> instead of be16_to_cpu().

Thanks for having taken a look.
-- 
Florian


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