linux-kernel - Re: [RFC PATCH v12 01/17] dlb: add skeleton for DLB driver

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Date:   Wed, 22 Dec 2021 21:39:28 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        "Chen, Mike Ximing" <mike.ximing.chen@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "pierre-louis.bossart@...ux.intel.com
        <pierre-louis.bossart@...ux.intel.com>, netdev@...r.kernel.org
        <netdev@...r.kernel.org>, davem@...emloft.net <davem@...emloft.net>,
        kuba@...nel.org" <kuba@...nel.org>
Subject: Re: [RFC PATCH v12 01/17] dlb: add skeleton for DLB driver

On Wed, Dec 22, 2021 at 7:48 PM Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
> On Wed, 22 Dec 2021 22:26:38 +0100
> Andrew Lunn <andrew@...n.ch> wrote:
>
> > > > pointing to skbufs? How are the lifetimes of skbufs managed? How do you get skbufs out of the NIC? Are
> > > > you using XDP?
> > >
> > > This is not a network accelerator in the sense that it does not have
> > > direct access to the network sockets/ports. We do not use XDP.
> >
> > So not using XDP is a problem. I looked at previous versions of this
> > patch, and it is all DPDK. But DPDK is not in mainline, XDP is. In
> > order for this to be merged into mainline you need a mainline user of
> > it.
> >
> > Maybe you should abandon mainline, and just get this driver merged
> > into the DPDK fork of Linux?
>
> DPDK is all userspace and runs on stock kernels from Debian, Redhat, SUSE, ...
> There is no special fork for DPDK.

Appreciate the help Stephen. Netlink and taking this through
drivers/net/, where there are other folks that care about DPDK, seems
a better fit than drivers/misc/. I'll huddle with Mike after the
holidays.