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Date:   Thu, 10 Sep 2020 14:05:15 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Oded Gabbay <oded.gabbay@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, SW_Drivers <SW_Drivers@...ana.ai>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 00/15] Adding GAUDI NIC code to habanalabs driver



On 9/10/2020 1:32 PM, Oded Gabbay wrote:
> On Thu, Sep 10, 2020 at 11:28 PM Jakub Kicinski <kuba@...nel.org> wrote:
>>
>> On Thu, 10 Sep 2020 23:16:22 +0300 Oded Gabbay wrote:
>>> On Thu, Sep 10, 2020 at 11:01 PM Jakub Kicinski <kuba@...nel.org> wrote:
>>>> On Thu, 10 Sep 2020 19:11:11 +0300 Oded Gabbay wrote:
>>>>>   create mode 100644 drivers/misc/habanalabs/gaudi/gaudi_nic.c
>>>>>   create mode 100644 drivers/misc/habanalabs/gaudi/gaudi_nic.h
>>>>>   create mode 100644 drivers/misc/habanalabs/gaudi/gaudi_nic_dcbnl.c
>>>>>   create mode 100644 drivers/misc/habanalabs/gaudi/gaudi_nic_debugfs.c
>>>>>   create mode 100644 drivers/misc/habanalabs/gaudi/gaudi_nic_ethtool.c
>>>>>   create mode 100644 drivers/misc/habanalabs/gaudi/gaudi_phy.c
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_qm0_masks.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_qm0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_qm1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_qpc0_masks.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_qpc0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_qpc1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_rxb_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_rxe0_masks.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_rxe0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_rxe1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_stat_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_tmr_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_txe0_masks.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_txe0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_txe1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_txs0_masks.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_txs0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic0_txs1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic1_qm0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic1_qm1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic2_qm0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic2_qm1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic3_qm0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic3_qm1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic4_qm0_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/gaudi/asic_reg/nic4_qm1_regs.h
>>>>>   create mode 100644 drivers/misc/habanalabs/include/hw_ip/nic/nic_general.h
>>>>
>>>> The relevant code needs to live under drivers/net/(ethernet/).
>>>> For one thing our automation won't trigger for drivers in random
>>>> (/misc) part of the tree.
>>>
>>> Can you please elaborate on how to do this with a single driver that
>>> is already in misc ?
>>> As I mentioned in the cover letter, we are not developing a
>>> stand-alone NIC. We have a deep-learning accelerator with a NIC
>>> interface.
>>> Therefore, we don't have a separate PCI physical function for the NIC
>>> and I can't have a second driver registering to it.
>>
>> Is it not possible to move the files and still build them into a single
>> module?
> hmm...
> I actually didn't try that as I thought it will be very strange and
> I'm not familiar with other drivers that build as a single ko but have
> files spread out in different subsystems.
> I don't feel it is a better option than what we did here.
> 
> Will I need to split pull requests to different subsystem maintainers
> ? For the same driver ?
> Sounds to me this is not going to fly.

Not necessarily, you can post your patches to all relevant lists and 
seek maintainer review/acked-by tags from the relevant maintainers. This 
is not unheard of with mlx5 for instance.

Have you considered using notifiers to get your NIC driver registered 
while the NIC code lives in a different module?
-- 
Florian

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