netdev - Re: [PATCH v4 net-next 02/19] ionic: Add hardware init and device commands

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Message-ID: <0ef47dc2-efdd-531f-d1a0-6f4d0d1b9f13@pensando.io>
Date:   Wed, 24 Jul 2019 10:49:09 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v4 net-next 02/19] ionic: Add hardware init and device
 commands

On 7/23/19 4:05 PM, David Miller wrote:
> From: Shannon Nelson <snelson@...sando.io>
> Date: Tue, 23 Jul 2019 15:50:22 -0700
>
>> On 7/23/19 2:18 PM, David Miller wrote:
>>> From: Shannon Nelson <snelson@...sando.io>
>>> Date: Mon, 22 Jul 2019 14:40:06 -0700
>>>
>>>> +void ionic_init_devinfo(struct ionic_dev *idev)
>>>> +{
>>>> + idev->dev_info.asic_type = ioread8(&idev->dev_info_regs->asic_type);
>>>> + idev->dev_info.asic_rev = ioread8(&idev->dev_info_regs->asic_rev);
>>>> +
>>>> +	memcpy_fromio(idev->dev_info.fw_version,
>>>> +		      idev->dev_info_regs->fw_version,
>>>> +		      IONIC_DEVINFO_FWVERS_BUFLEN);
>>>> +
>>>> +	memcpy_fromio(idev->dev_info.serial_num,
>>>> +		      idev->dev_info_regs->serial_num,
>>>> +		      IONIC_DEVINFO_SERIAL_BUFLEN);
>>>    ...
>>>> +	sig = ioread32(&idev->dev_info_regs->signature);
>>> I think if you are going to use the io{read,write}{8,16,32,64}()
>>> interfaces then you should use io{read,write}{8,16,32,64}_rep()
>>> instead of memcpy_{to,from}io().
>>>
>> Sure.
> Note, I could be wrong.  Please test.
>
> I think the operation of the two things might be different.
Yes, they are different things, the iowrite*_rep() functions write each 
value from a buffer all to the same single address, rather than copy a 
buffer into another buffer, and the ioread*_rep() functions repeatedly 
read from the same address to fill a buffer.

For example, the iowrite32_rep() boils down to this:
         do {
             __raw_writel(*buf++, addr);
         } while (--count);

Not quite what I need.

sln