netdev - Re: [PATCH net-next v3 1/2] pci: Add Cavium PCI vendor id

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Date:	Mon, 18 May 2015 10:51:27 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>
CC:	Aleksey Makarov <aleksey.makarov@...iga.com>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Daney <david.daney@...ium.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH net-next v3 1/2] pci: Add Cavium PCI vendor id

On 05/18/2015 10:26 AM, Bjorn Helgaas wrote:
> On Mon, May 18, 2015 at 11:41 AM, David Miller <davem@...emloft.net> wrote:
>> From: Bjorn Helgaas <bhelgaas@...gle.com>
>> Date: Mon, 18 May 2015 11:35:20 -0500
>>
>>> [+cc Greg]
>>>
>>> On Sat, May 16, 2015 at 4:14 PM, David Miller <davem@...emloft.net> wrote:
>>>> From: Bjorn Helgaas <bhelgaas@...gle.com>
>>>> Date: Sat, 16 May 2015 09:49:40 -0500
>>>>
>>>>> Hi Aleksey,
>>>>>
>>>>> On Fri, May 15, 2015 at 10:36 PM, Aleksey Makarov
>>>>> <aleksey.makarov@...iga.com> wrote:
>>>>>> Signed-off-by: Aleksey Makarov <aleksey.makarov@...iga.com>
>>>>>> ---
>>>>>>   include/linux/pci_ids.h | 2 ++
>>>>>>   1 file changed, 2 insertions(+)
>>>>>>
>>>>>> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
>>>>>> index e63c02a..3633cc6 100644
>>>>>> --- a/include/linux/pci_ids.h
>>>>>> +++ b/include/linux/pci_ids.h
>>>>>> @@ -2327,6 +2327,8 @@
>>>>>>   #define PCI_DEVICE_ID_ALTIMA_AC9100    0x03ea
>>>>>>   #define PCI_DEVICE_ID_ALTIMA_AC1003    0x03eb
>>>>>>
>>>>>> +#define PCI_VENDOR_ID_CAVIUM           0x177d
>>>>>
>>>>> Please read the note at the top of include/linux/pci_ids.h.  If this
>>>>> definition is used in two or more drivers, mention that in the
>>>>> changelog.  Otherwise, just use the bare hex value or a private
>>>>> #define in your driver.
>>>>
>>>> It is referenced from two foo.c files in the same driver.
>>>>
>>>> I don't know what policy we want for situations like that.
>>>
>>> The current policy (1d4a433fc4e9 ("PCI: Document pci_ids.h addition
>>> policy.")) predates me and I don't know the whole rationale.  I can
>>> see that it might reduce backporting pain for distros.
>>>
>>> If two foo.c files in the same driver share the PCI ID, they likely
>>> share other things as well, so there's likely a shared .h file where a
>>> private PCI_VENDOR_ID_CAVIUM could go.
>>>
>>> But this is a vendor ID (not a device ID), and it seems likely that
>>> there will be other devices from Cavium, so maybe it would make sense
>>> to apply the policy to device IDs, and go ahead and add vendor IDs to
>>> pci_ids.h.
>>
>> That makes sense to me, and therefore this change is probably fine as-is.
>
> OK.  I assume you'll take the whole series, so:
>
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
>

Thanks guys,

Just for the record, the Cavium ThunderX network controller driver (that 
is part 2/2 of the series), is just the first user of the 
PCI_VENDOR_ID_CAVIUM.  We have in the pipeline drivers/patches for USB 
(xHCI), SATA (AHCI), GPIO, I2C, MMC, and maybe others that will also be 
using this #define.

I also agree with the concept that the vendor ID has more if a place in 
pci_ids.h than device IDs (which usually can go in the driver itself).

David Daney


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