netdev-dpdk: Expose flow creation/destruction calls

netdev-dpdk: Expose flow creation/destruction calls

Before offloading code was added to the netdev-dpdk.c file (MARK and
RSS actions) the only DPDK RTE calls in use were rte_flow_create() and
rte_flow_destroy(). In preparation for splitting the offloading code
from the netdev-dpdk.c file to a separate file, it is required
to embed these RTE calls into a global netdev-dpdk-* API so that
they can be called from the new file. An example for this requirement
can be seen in the handling of dev->mutex, which should be encapsulated
inside netdev-dpdk class (netdev-dpdk.c file), and should be unknown
to the outside callers. This commit embeds the rte_flow_create() call
inside the netdev_dpdk_flow_create() API and the rte_flow_destroy()
call inside the netdev_dpdk_rte_flow_destroy() API.

Reviewed-by: Asaf Penso <asafp@mellanox.com>
Signed-off-by: Roni Bar Yanai <roniba@mellanox.com>
Signed-off-by: Ophir Munk <ophirmu@mellanox.com>
Co-authored-by: Ophir Munk <ophirmu@mellanox.com>
Acked-by: Ilya Maximets <i.maximets@samsung.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>