dpdk: Add support for Mellanox ConnectX-4 devices

Due to external library dependency support for Mellanox
devices is disabled. To enable it uncoment following line:

vpp_uses_dpdk_mlx5_pmd = yes

in build-data/platforms/vpp.mk and install OFED libraries.

Change-Id: I131d52b5d449a958349f31f9cc04311948f78b71
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/dpdk/Makefile b/dpdk/Makefile
index 46cc3db..178c30c 100644
--- a/dpdk/Makefile
+++ b/dpdk/Makefile
@@ -21,7 +21,8 @@
 DPDK_MARCH            ?= native
 DPDK_TUNE             ?= generic
 DPDK_DEBUG            ?= n
-DPDK_CRYPTO_PMD        ?= n
+DPDK_CRYPTO_PMD       ?= n
+DPDK_MLX5_PMD         ?= n
 
 B := $(DPDK_BUILD_DIR)
 I := $(DPDK_INSTALL_DIR)
@@ -122,6 +123,7 @@
 	$(call set,RTE_LIBRTE_PMD_AESNI_MB,$(DPDK_CRYPTO_PMD))
 	$(call set,RTE_LIBRTE_PMD_AESNI_GCM,$(DPDK_CRYPTO_PMD))
 	$(call set,RTE_LIBRTE_PMD_QAT,$(DPDK_CRYPTO_PMD))
+	$(call set,RTE_LIBRTE_MLX5_PMD,$(DPDK_MLX5_PMD))
 	@# not needed
 	$(call set,RTE_LIBRTE_TIMER,n)
 	$(call set,RTE_LIBRTE_CFGFILE,n)