On Mon, Sep 19, 2016 at 2:51 AM, Mintz, Yuval <yuval.mi...@cavium.com> wrote:

>> If the user chooses 2 rx and 1 tx, he will use 3 msix vectors (3 completion 
>> rings,
>> etc).  If the user chooses 2 combined (1 with rx/tx,
>> 1 with rx only), he will use 2 msix vectors (2 completion rings, etc).
>> With a large number of NPAR functions and SRIOV functions, the number of
>> rings available per function may not be symmetrical.  We just want maximum
>> flexibility to make use of all available resources in 2 different modes (one 
>> that
>> uses more resources and one that uses less).
> Sounds like the user should chose 1 combined in 1 rx in this scenario.

We only support all combined or all rx/tx.  Supporting arbitrary
combination of the 2 will add a lot more complication to the driver
code.  I don't think it will add any value to the user either.  In the
end, it's all the same and the user sees a simpler interface.  If
combined is chosen, the driver logic will combine all available rx/tx
ring pairs.  Any remaining rings will still be used to reach the
desired combined count.

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