netdev-dpdk: Move offloading code to a new file

Hardware offloading code is moved to a new file called
netdev-rte-offloads.c. The original offloading code is copied
from the netdev-dpdk.c file to the new file, where future
offloading code should be added as well.
The copied code was refactored based on coding style.
The netdev-dpdk.c file will remain unchanged as new offloading
code is added.

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

lib/automake.mk

@@ -138,6 +138,7 @@ lib_libopenvswitch_la_SOURCES = \
 	lib/netdev-dpdk.h \
 	lib/netdev-dummy.c \
 	lib/netdev-provider.h \
+	lib/netdev-rte-offloads.h \
 	lib/netdev-vport.c \
 	lib/netdev-vport.h \
 	lib/netdev-vport-private.h \
@@ -411,7 +412,8 @@ endif
 if DPDK_NETDEV
 lib_libopenvswitch_la_SOURCES += \
 	lib/dpdk.c \
-	lib/netdev-dpdk.c
+	lib/netdev-dpdk.c \
+	lib/netdev-rte-offloads.c
 else
 lib_libopenvswitch_la_SOURCES += \
 	lib/dpdk-stub.c