net/bnxt: fix tunnel stateless offloads

net/bnxt: fix tunnel stateless offloads

The HW only supports tunnel header parsing globally for supported tunnel
types. When a function uses one default VNIC to receive both the tunnel
and non-tunnel packets, applying the same stateless offload operation to
both tunnel and non-tunnel packets can cause problems in certain scenarios.
To workaround these problems, the firmware advertises no tunnel header
parsing capabilities to the driver using the HWRM_FUNC_QCAPS.
The driver must check this flag setting and accordingly not advertise
tunnel packet stateless offload capabilities to the stack.

If the device supports VXLAN, GRE, IPIP and GENEVE tunnel parsing,
then reports RX_OFFLOAD_OUTER_IPV4_CKSUM, RX_OFFLOAD_OUTER_UDP_CKSUM
and TX_OFFLOAD_OUTER_IPV4_CKSUM in the Rx/Tx offload capabilities of
the device.
Also, advertise tunnel TSO capabilities based on FW support.

Fixes: 0a6d2a720078 ("net/bnxt: get device infos")
Cc: stable@dpdk.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>