netdev - Re: [Intel-wired-lan] [net-next PATCH v3 2/3] e1000: add initial XDP support

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Message-ID: <AB6E7248-F1A3-4C9C-9249-7F25E51BA1E4@intel.com>
Date:   Tue, 13 Sep 2016 19:14:27 +0000
From:   "Rustad, Mark D" <mark.d.rustad@...el.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
CC:     Eric Dumazet <eric.dumazet@...il.com>,
        Tom Herbert <tom@...bertland.com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        William Tu <u9012063@...il.com>
Subject: Re: [Intel-wired-lan] [net-next PATCH v3 2/3] e1000: add initial
 XDP support

Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:

> On Tue, Sep 13, 2016 at 06:28:03PM +0000, Rustad, Mark D wrote:
>> Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
>>
>>> I've looked through qemu and it appears only emulate e1k and tg3.
>>> The latter is still used in the field, so the risk of touching
>>> it is higher.
>>
>> I have no idea what makes you think that e1k is *not* "used in the field".
>> I grant you it probably is used more virtualized than not these days,  
>> but it
>> certainly exists and is used. You can still buy them new at Newegg for
>> goodness sakes!
>
> the point that it's only used virtualized, since PCI (not PCIE) have
> been long dead.

My point is precisely the opposite. It is a real device, it exists in real  
systems and it is used in those systems. I worked on embedded systems that  
ran Linux and used e1000 devices. I am sure they are still out there  
because customers are still paying for support of those systems.

Yes, PCI(-X) is absent from any current hardware and has been for some  
years now, but there is an installed base that continues. What part of that  
installed base updates software? I don't know, but I would not just assume  
that it is 0. I know that I updated the kernel on those embedded systems  
that I worked on when I was supporting them. Never at the bleeding edge,  
but generally hopping from one LTS kernel to another as needed.

The day is coming when all the motherboards with PCI(-X) will be gone, but  
I think it is still at least a few years off.

--
Mark Rustad, Networking Division, Intel Corporation

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