net: add MPLS header structure

Add the Mpls header structure in librte_net. It will be used by next
patch that adds the support of Mpls L2 layer in the software packet
type parser.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

lib/librte_net/Makefile

@@ -20,6 +20,6 @@ SRCS-$(CONFIG_RTE_LIBRTE_NET) += rte_arp.c
 SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include := rte_ip.h rte_tcp.h rte_udp.h rte_esp.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_sctp.h rte_icmp.h rte_arp.h
 SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_ether.h rte_gre.h rte_net.h
-SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_net_crc.h
+SYMLINK-$(CONFIG_RTE_LIBRTE_NET)-include += rte_net_crc.h rte_mpls.h
 
 include $(RTE_SDK)/mk/rte.lib.mk

lib/librte_net/meson.build

@@ -13,7 +13,8 @@ headers = files('rte_ip.h',
 	'rte_ether.h',
 	'rte_gre.h',
 	'rte_net.h',
-	'rte_net_crc.h')
+	'rte_net_crc.h',
+	'rte_mpls.h')
 
 sources = files('rte_arp.c', 'rte_net.c', 'rte_net_crc.c')
 deps += ['mbuf']

lib/librte_net/rte_mpls.h

@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2016 6WIND S.A.
+ */
+
+#ifndef _RTE_MPLS_H_
+#define _RTE_MPLS_H_
+
+/**
+ * @file
+ *
+ * MPLS-related defines
+ */
+
+#include <stdint.h>
+#include <rte_byteorder.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * MPLS header.
+ */
+struct mpls_hdr {
+	uint16_t tag_msb;   /**< Label(msb). */
+#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+	uint8_t tag_lsb:4;  /**< Label(lsb). */
+	uint8_t tc:3;       /**< Traffic class. */
+	uint8_t bs:1;       /**< Bottom of stack. */
+#else
+	uint8_t bs:1;       /**< Bottom of stack. */
+	uint8_t tc:3;       /**< Traffic class. */
+	uint8_t tag_lsb:4;  /**< label(lsb) */
+#endif
+	uint8_t  ttl;       /**< Time to live. */
+} __attribute__((__packed__));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_MPLS_H_ */