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Date:   Thu, 16 May 2019 15:36:14 -0700
From:   Jeff Kirsher <>
To:     Paul Stewart <>,,
        intel-wired-lan <>
Subject: Re: ixgbe device for Intel C3508

On Thu, 2019-05-16 at 12:53 -0700, Paul Stewart wrote:
> I was pleased to fine that the ixgbe driver had good support for the
> 10GBit interfaces on the Atom C3708 device I was using.  However, the
> same is not true of the 2.5GBit interfaces on the Atom C3508.  The
> IDs on these interfaces are very similar -- 8086:15cf on the C3508 vs
> 8086:15ce on the C3708.  Modifying the ixgbe driver to simply treat
> 8086:15cf almost works -- the 4 Ethernet interfaces are discovered
> and
> *something* happens when I plug in a Gigiabit ethernet cable into the
> SFP port:
> [  269.233242] ixgbe 0000:0c:00.0 eth1: NIC Link is Up 1 Gbps, Flow
> Control: RX/
> TX
> [  269.240733] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes
> ready
> [  269.337230] ixgbe 0000:0c:00.0 eth1: NIC Link is Down
> [  289.682588] ixgbe 0000:0c:00.1 eth2: detected SFP+: 6
> [  392.859888] ixgbe 0000:0c:00.0: removed PHC on eth1
> [  393.497099] ixgbe 0000:0c:00.1: removed PHC on eth2
> [  394./MA257214] ixgbe 0000:0d:00.0: removed PHC on eth3
> [  394.867122] ixgbe 0000:0d:00.1 eth4: NIC Link is Up 1 Gbps, Flow
> Control: RX/TX
> [  394.889384] ixgbe 0000:0d:00.1: removed PHC on eth4
> Clearly not all is well, as could be expected -- I'm sure there's a
> real reason why these are separate PCI IDs.   Is there someone out
> there that can point me at docs I can use to support the device
> myself, or does anyone know if support is coming?  Should this device
> be considered an X550 or is this a different device fundamentally
> (should I not use the Intel X550 docs as a reference, if I were to
> hunt down some documentation about the difference between these
> parts?)

Adding the intel-wired-lan mailing, which is the proper mailing list
for issues like this.

Let me look into this and get back to you.

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