Splitting Mellanox ConnectX-4 interface using breakout cables

[Andrey V. Elsukov]

On 13.09.2017 16:43, David Horn wrote:
> I was under the impression that these Mellanox 40G->4x10G breakout
> cables were for the Mellanox switch side (not Mellanox NIC) to provide
> more flexible utilization options for the switch.  I have never heard of
> doing this from the 40G NIC (on any OS).
> 
> Please reply if you have seen this working on *any* OS from the Mellanox
> 40G NIC, as I am curious as well and have a both ConnectX-3 and -4 HW.

We have several Intel-XL710-QDA1 cards that work like this:

ixl0 at pci0:6:0:0:	class=0x020000 card=0x00028086 chip=0x15848086 rev=0x01
hdr=0x00
ixl1 at pci0:6:0:1:	class=0x020000 card=0x00008086 chip=0x15848086 rev=0x01
hdr=0x00
ixl2 at pci0:6:0:2:	class=0x020000 card=0x00008086 chip=0x15848086 rev=0x01
hdr=0x00
ixl3 at pci0:6:0:3:	class=0x020000 card=0x00008086 chip=0x15848086 rev=0x01
hdr=0x00

This is one card with QSPF28 splited into 4x10G.

-- 
WBR, Andrey V. Elsukov

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