i40e: setup xdp_rxq_info

The i40e driver has a special "FDIR" RX-ring (I40E_VSI_FDIR) which is
a sideband channel for configuring/updating the flow director tables.
This (i40e_vsi_)type does not invoke XDP-ebpf code.

As suggested by Björn (V2): Instead of marking this I40E_VSI_FDIR RX-ring
a special case, reverse the logic and only select RX-rings of type
I40E_VSI_MAIN to register xdp_rxq_info's for.

Driver hook points for xdp_rxq_info:
 * reg  : i40e_setup_rx_descriptors (via i40e_vsi_setup_rx_resources)
 * unreg: i40e_free_rx_resources    (via i40e_vsi_free_rx_resources)

Tested on actual hardware with samples/bpf program.

V2: Fixed bug in i40e_set_ringparam (memset zero) + match on I40E_VSI_MAIN.
V4: Update patch desc that got out-of-sync with code.

Cc: [email protected]
Cc: Björn Töpel <[email protected]>
Cc: Jeff Kirsher <[email protected]>
Cc: Paul Menzel <[email protected]>
Signed-off-by: Jesper Dangaard Brouer <[email protected]>
Reviewed-by: Paul Menzel <[email protected]>
Acked-by: John Fastabend <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>

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