netdev - Re: [PATCH net-next] net: mark tulip obsolete

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Date:   Tue, 26 Apr 2022 22:53:00 +0200
From:   Helge Deller <deller@....de>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-parisc@...r.kernel.org,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>
Subject: Re: [PATCH net-next] net: mark tulip obsolete

Hi Jakub,

On 4/26/22 14:53, Jakub Kicinski wrote:
> On Tue, 15 Mar 2022 23:18:38 +0100 Helge Deller wrote:
>> On 3/15/22 20:04, Jakub Kicinski wrote:
>>> On Tue, 15 Mar 2022 19:44:24 +0100 Helge Deller wrote:
>>>> On 3/15/22 19:43, Jakub Kicinski wrote:
>>>>> It's ancient, an likely completely unused at this point.
>>>>> Let's mark it obsolete to prevent refactoring.
>>>>
>>>> NAK.
>>>>
>>>> This driver is needed by nearly all PA-RISC machines.
>>>
>>> I was just trying to steer newcomers to code that's more relevant today.
>>
>> That intention is ok, but "obsolete" means it's not used any more,
>> and that's not true.
>
> Hi Helge! Which incarnation of tulip do you need for PA-RISC, exactly?

For parisc I have:

CONFIG_NET_TULIP=y
# CONFIG_DE2104X is not set
CONFIG_TULIP=y
# CONFIG_TULIP_MWI is not set
# CONFIG_TULIP_MMIO is not set
# CONFIG_TULIP_NAPI is not set
# CONFIG_DE4X5 is not set
# CONFIG_WINBOND_840 is not set
# CONFIG_DM9102 is not set
# CONFIG_ULI526X is not set
# CONFIG_PCMCIA_XIRCOM is not set
# CONFIG_NET_VENDOR_DLINK is not set
# CONFIG_NET_VENDOR_EMULEX is not set

So not the DE4X5.

> I'd like to try to remove DE4X5, if that's not the one you need
> (getting rid of virt_to_bus()-using drivers).

I've CC'ed the linux-alpha mailing list, as the DE4X5 driver might be
needed there, so removing it completely might not be the best idea.

But since you want to remove virt_to_bus()....
It seems this virt_to_bus() call is used for really old x86 machines/cards,
which probably aren't supported any longer.

See drivers/net/ethernet/dec/tulip/de4x5.c:
...
#if !defined(__alpha__) && !defined(__powerpc__) && !defined(CONFIG_SPARC) && !defined(DE4X5_DO_MEMCPY)
...
    tmp = virt_to_bus(p->data);
...

Maybe you could simply remove the part inside #if...#else
and insert a pr_err() instead (and return NULL)?

Helge