Hi guys,
I'm using Intel 82599 in SR-IOV mode, and my goal is to switch traffic to
given VF by some L3/L4 criteria. The simplest setup looks like: there is a
PF and one VF on it, and I need all UDP:55777 incoming packets to be
switched to VF, while all other packets should go to PF. Of course, remote
network equipment doesn't know that I have PF and VF, all packets arrive
with the same destination MAC (the PF's one), but need to be switched based
of higher level criteria, so I can handle some of them on a virtual machine
and some on the host machine.
I tried to use ntuple filters for that, but somehow it doesn't work -
modifying the target queue doesn't direct packet to VF when it's destined
to PF's MAC. Reading through 82599 datasheet, I can see that in SR-IOV mode
the queues are grouped to pools, and each VF is associated with a pool.
It's not quite clear if the pool, once selected, can be changed with ntuple
filters.
What I don't quite understand about 82599 and ixgbe driver is:
1) How exactly queues are grouped in pools in SR-IOV mode under ixgbe
driver? How many queues belong to each pool (and thus to each VF) by
default, is it 1 queue or more?
2) As I understand from the datasheet, the pool is first selected for Rx
packet by MAC address filters. Can it be changed later by 5-tuple or flow
director filters (by selecting a queue that belongs to another pool), or
can those only change queue number within a pool that is selected by MAC
address?
3) If the pool can't be changed with 5-tuple or flow director filters,
should it be possible to select multiple pools by MAC address (by modifying
MPSAR[n] registers and enabling more than one pool bits for given MAC
address) and then finally select queue (and a pool along with it) with
5-tuple or flow director filters? Does current ixgbe driver have any
infrastructure for this behavious?
4) Does ethool ntuple features correspond to 5-tuple filters or flow
director filters in 82599? They look pretty similar but seems to be two
different sets of filters.
Any help is really appreciated!
Best regards,
Eugene
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