linux-kernel - Re: [PATCH v3 00/14] Adding GAUDI NIC code to habanalabs driver

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Date:   Tue, 15 Sep 2020 23:37:35 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "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>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-rdma@...r.kernel.org
Subject: Re: [PATCH v3 00/14] Adding GAUDI NIC code to habanalabs driver

> I completely understand but you didn't answer my question. How come
> there are drivers which create netdev objects, and specifically sgi-xp
> in misc (but I also saw it in usb drivers) that live outside
> drivers/net ? Why doesn't your request apply to them as well ?
> When we wrote the code, we saw those examples and therefore assumed it was fine.

commit 45d9ca492e4bd1522d1b5bd125c2908f1cee3d4a
Author: Dean Nelson <dcn@....com>
Date:   Tue Apr 22 14:46:56 2008 -0500

    [IA64] move XP and XPC to drivers/misc/sgi-xp
    
    Move XPC and XPNET from arch/ia64/sn/kernel to drivers/misc/sgi-xp.
    
    Signed-off-by: Dean Nelson <dcn@....com>
    Signed-off-by: Tony Luck <tony.luck@...el.com>

It has been there a long time, and no networking person was involved
in its move.

drivers/usb/gadget/function/f_ncm.c
commit 00a2430ff07d4e0e0e7e24e02fd8adede333b797
Author: Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Date:   Tue Jul 15 13:09:46 2014 +0200

    usb: gadget: Gadget directory cleanup - group usb functions
    
    The drivers/usb/gadget directory contains many files.
    Files which are related can be distributed into separate directories.
    This patch moves the USB functions implementations into a separate directory.
    
    Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@...sung.com>
    Signed-off-by: Felipe Balbi <balbi@...com>

Again, old.

Can you find an example of a network driver added in the last couple
of years outside of drivers/met?

> > > > Please make sure to CC linux-rdma. You clearly stated that the device
> > > > does RDMA-like transfers.
> > >
> > > We don't use the RDMA infrastructure in the kernel and we can't
> > > connect to it due to the lack of H/W support we have so I don't see
> > > why we need to CC linux-rdma.
> >
> > You have it backward. You don't get to pick and choose which parts of
> > the infrastructure you use, and therefore who reviews your drivers.
> > The device uses RDMA under the hood so Linux RDMA experts must very
> > much be okay with it getting merged. That's how we ensure Linux
> > interfaces are consistent and good quality.
> 
> I understand your point of view but If my H/W doesn't support the
> basic requirements of the RDMA infrastructure and interfaces, then
> really there is nothing I can do about it. I can't use them.

It is up to the RDMA people to say that. They might see how the RDMA
core can be made to work for your hardware.

     Andrew