diff --git a/app/test/test_mbuf.c b/app/test/test_mbuf.c
index 2a97afe20..8008cc766 100644
--- a/app/test/test_mbuf.c
+++ b/app/test/test_mbuf.c
@@ -28,6 +28,7 @@
 #include <rte_random.h>
 #include <rte_cycles.h>
 #include <rte_malloc.h>
+#include <rte_mbuf_dyn.h>
 
 #include "test.h"
 
@@ -502,7 +503,6 @@ test_attach_from_different_pool(struct rte_mempool *pktmbuf_pool,
 		rte_pktmbuf_free(clone2);
 	return -1;
 }
-#undef GOTO_FAIL
 
 /*
  * test allocation and free of mbufs
@@ -1122,6 +1122,81 @@ test_tx_offload(void)
 }
 
 static int
+test_mbuf_dyn(struct rte_mempool *pktmbuf_pool)
+{
+	struct rte_mbuf *m = NULL;
+	int offset, offset2;
+	int flag, flag2;
+
+	offset = rte_mbuf_dynfield_register("test-dynfield", sizeof(uint8_t),
+					__alignof__(uint8_t), 0);
+	if (offset == -1)
+		GOTO_FAIL("failed to register dynamic field, offset=%d: %s",
+			offset, strerror(errno));
+
+	offset2 = rte_mbuf_dynfield_register("test-dynfield", sizeof(uint8_t),
+					__alignof__(uint8_t), 0);
+	if (offset2 != offset)
+		GOTO_FAIL("failed to lookup dynamic field, offset=%d, offset2=%d: %s",
+			offset, offset2, strerror(errno));
+
+	offset2 = rte_mbuf_dynfield_register("test-dynfield2", sizeof(uint16_t),
+					__alignof__(uint16_t), 0);
+	if (offset2 == -1 || offset2 == offset || (offset & 1))
+		GOTO_FAIL("failed to register dynfield field 2, offset=%d, offset2=%d: %s",
+			offset, offset2, strerror(errno));
+
+	printf("offset = %d, offset2 = %d\n", offset, offset2);
+
+	offset = rte_mbuf_dynfield_register("test-dynfield-fail", 256, 1, 0);
+	if (offset != -1)
+		GOTO_FAIL("dynamic field creation should fail (too big)");
+
+	offset = rte_mbuf_dynfield_register("test-dynfield-fail", 1, 3, 0);
+	if (offset != -1)
+		GOTO_FAIL("dynamic field creation should fail (bad alignment)");
+
+	flag = rte_mbuf_dynflag_register("test-dynflag");
+	if (flag == -1)
+		GOTO_FAIL("failed to register dynamic field, flag=%d: %s",
+			flag, strerror(errno));
+
+	flag2 = rte_mbuf_dynflag_register("test-dynflag");
+	if (flag2 != flag)
+		GOTO_FAIL("failed to lookup dynamic field, flag=%d, flag2=%d: %s",
+			flag, flag2, strerror(errno));
+
+	flag2 = rte_mbuf_dynflag_register("test-dynflag2");
+	if (flag2 == -1 || flag2 == flag)
+		GOTO_FAIL("failed to register dynflag field 2, flag=%d, flag2=%d: %s",
+			flag, flag2, strerror(errno));
+
+	printf("flag = %d, flag2 = %d\n", flag, flag2);
+
+	/* set, get dynamic field */
+	m = rte_pktmbuf_alloc(pktmbuf_pool);
+	if (m == NULL)
+		GOTO_FAIL("Cannot allocate mbuf");
+
+	*RTE_MBUF_DYNFIELD(m, offset, uint8_t *) = 1;
+	if (*RTE_MBUF_DYNFIELD(m, offset, uint8_t *) != 1)
+		GOTO_FAIL("failed to read dynamic field");
+	*RTE_MBUF_DYNFIELD(m, offset2, uint16_t *) = 1000;
+	if (*RTE_MBUF_DYNFIELD(m, offset2, uint16_t *) != 1000)
+		GOTO_FAIL("failed to read dynamic field");
+
+	/* set a dynamic flag */
+	m->ol_flags |= (1ULL << flag);
+
+	rte_pktmbuf_free(m);
+	return 0;
+fail:
+	rte_pktmbuf_free(m);
+	return -1;
+}
+#undef GOTO_FAIL
+
+static int
 test_mbuf(void)
 {
 	int ret = -1;
@@ -1140,6 +1215,12 @@ test_mbuf(void)
 		goto err;
 	}
 
+	/* test registration of dynamic fields and flags */
+	if (test_mbuf_dyn(pktmbuf_pool) < 0) {
+		printf("mbuf dynflag test failed\n");
+		goto err;
+	}
+
 	/* create a specific pktmbuf pool with a priv_size != 0 and no data
 	 * room size */
 	pktmbuf_pool2 = rte_pktmbuf_pool_create("test_pktmbuf_pool2",
diff --git a/lib/librte_mbuf/Makefile b/lib/librte_mbuf/Makefile
index c8f6d2689..5a9bcee73 100644
--- a/lib/librte_mbuf/Makefile
+++ b/lib/librte_mbuf/Makefile
@@ -17,8 +17,10 @@ LIBABIVER := 5
 
 # all source are stored in SRCS-y
 SRCS-$(CONFIG_RTE_LIBRTE_MBUF) := rte_mbuf.c rte_mbuf_ptype.c rte_mbuf_pool_ops.c
+SRCS-$(CONFIG_RTE_LIBRTE_MBUF) += rte_mbuf_dyn.c
 
 # install includes
 SYMLINK-$(CONFIG_RTE_LIBRTE_MBUF)-include := rte_mbuf.h rte_mbuf_ptype.h rte_mbuf_pool_ops.h
+SYMLINK-$(CONFIG_RTE_LIBRTE_MBUF)-include += rte_mbuf_dyn.h
 
 include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_mbuf/meson.build b/lib/librte_mbuf/meson.build
index 6cc11ebb4..9137e8f26 100644
--- a/lib/librte_mbuf/meson.build
+++ b/lib/librte_mbuf/meson.build
@@ -2,8 +2,10 @@
 # Copyright(c) 2017 Intel Corporation
 
 version = 5
-sources = files('rte_mbuf.c', 'rte_mbuf_ptype.c', 'rte_mbuf_pool_ops.c')
-headers = files('rte_mbuf.h', 'rte_mbuf_ptype.h', 'rte_mbuf_pool_ops.h')
+sources = files('rte_mbuf.c', 'rte_mbuf_ptype.c', 'rte_mbuf_pool_ops.c',
+	'rte_mbuf_dyn.c')
+headers = files('rte_mbuf.h', 'rte_mbuf_ptype.h', 'rte_mbuf_pool_ops.h',
+	'rte_mbuf_dyn.h')
 deps += ['mempool']
 
 allow_experimental_apis = true
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 98225ec80..ef588cd54 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -198,9 +198,12 @@ extern "C" {
 #define PKT_RX_OUTER_L4_CKSUM_GOOD	(1ULL << 22)
 #define PKT_RX_OUTER_L4_CKSUM_INVALID	((1ULL << 21) | (1ULL << 22))
 
-/* add new RX flags here */
+/* add new RX flags here, don't forget to update PKT_FIRST_FREE */
 
-/* add new TX flags here */
+#define PKT_FIRST_FREE (1ULL << 23)
+#define PKT_LAST_FREE (1ULL << 39)
+
+/* add new TX flags here, don't forget to update PKT_LAST_FREE  */
 
 /**
  * Indicate that the metadata field in the mbuf is in use.
@@ -738,6 +741,8 @@ struct rte_mbuf {
 	 */
 	struct rte_mbuf_ext_shared_info *shinfo;
 
+	uint64_t dynfield1; /**< Reserved for dynamic fields. */
+	uint64_t dynfield2; /**< Reserved for dynamic fields. */
 } __rte_cache_aligned;
 
 /**
@@ -1685,6 +1690,21 @@ rte_pktmbuf_attach_extbuf(struct rte_mbuf *m, void *buf_addr,
 #define rte_pktmbuf_detach_extbuf(m) rte_pktmbuf_detach(m)
 
 /**
+ * Copy dynamic fields from m_src to m_dst.
+ *
+ * @param m_dst
+ *   The destination mbuf.
+ * @param m_src
+ *   The source mbuf.
+ */
+static inline void
+rte_mbuf_dynfield_copy(struct rte_mbuf *m_dst, const struct rte_mbuf *m_src)
+{
+	m_dst->dynfield1 = m_src->dynfield1;
+	m_dst->dynfield2 = m_src->dynfield2;
+}
+
+/**
  * Attach packet mbuf to another packet mbuf.
  *
  * If the mbuf we are attaching to isn't a direct buffer and is attached to
@@ -1732,6 +1752,7 @@ static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m)
 	mi->vlan_tci_outer = m->vlan_tci_outer;
 	mi->tx_offload = m->tx_offload;
 	mi->hash = m->hash;
+	rte_mbuf_dynfield_copy(mi, m);
 
 	mi->next = NULL;
 	mi->pkt_len = mi->data_len;
diff --git a/lib/librte_mbuf/rte_mbuf_dyn.c b/lib/librte_mbuf/rte_mbuf_dyn.c
new file mode 100644
index 000000000..6a96a43da
--- /dev/null
+++ b/lib/librte_mbuf/rte_mbuf_dyn.c
@@ -0,0 +1,373 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2019 6WIND S.A.
+ */
+
+#include <sys/queue.h>
+
+#include <rte_common.h>
+#include <rte_eal.h>
+#include <rte_eal_memconfig.h>
+#include <rte_tailq.h>
+#include <rte_errno.h>
+#include <rte_malloc.h>
+#include <rte_string_fns.h>
+#include <rte_mbuf.h>
+#include <rte_mbuf_dyn.h>
+
+#define RTE_MBUF_DYN_MZNAME "rte_mbuf_dyn"
+
+struct mbuf_dynfield {
+	TAILQ_ENTRY(mbuf_dynfield) next;
+	char name[RTE_MBUF_DYN_NAMESIZE];
+	size_t size;
+	size_t align;
+	unsigned int flags;
+	int offset;
+};
+TAILQ_HEAD(mbuf_dynfield_list, rte_tailq_entry);
+
+static struct rte_tailq_elem mbuf_dynfield_tailq = {
+	.name = "RTE_MBUF_DYNFIELD",
+};
+EAL_REGISTER_TAILQ(mbuf_dynfield_tailq);
+
+struct mbuf_dynflag {
+	TAILQ_ENTRY(mbuf_dynflag) next;
+	char name[RTE_MBUF_DYN_NAMESIZE];
+	int bitnum;
+};
+TAILQ_HEAD(mbuf_dynflag_list, rte_tailq_entry);
+
+static struct rte_tailq_elem mbuf_dynflag_tailq = {
+	.name = "RTE_MBUF_DYNFLAG",
+};
+EAL_REGISTER_TAILQ(mbuf_dynflag_tailq);
+
+struct mbuf_dyn_shm {
+	/** For each mbuf byte, free_space[i] == 1 if space is free. */
+	uint8_t free_space[sizeof(struct rte_mbuf)];
+	/** Bitfield of available flags. */
+	uint64_t free_flags;
+};
+static struct mbuf_dyn_shm *shm;
+
+/* allocate and initialize the shared memory */
+static int
+init_shared_mem(void)
+{
+	const struct rte_memzone *mz;
+	uint64_t mask;
+
+	if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
+		mz = rte_memzone_reserve_aligned(RTE_MBUF_DYN_MZNAME,
+						sizeof(struct mbuf_dyn_shm),
+						SOCKET_ID_ANY, 0,
+						RTE_CACHE_LINE_SIZE);
+	} else {
+		mz = rte_memzone_lookup(RTE_MBUF_DYN_MZNAME);
+	}
+	if (mz == NULL)
+		return -1;
+
+	shm = mz->addr;
+
+#define mark_free(field)						\
+	memset(&shm->free_space[offsetof(struct rte_mbuf, field)],	\
+		0xff, sizeof(((struct rte_mbuf *)0)->field))
+
+	if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
+		/* init free_space, keep it sync'd with
+		 * rte_mbuf_dynfield_copy().
+		 */
+		memset(shm, 0, sizeof(*shm));
+		mark_free(dynfield1);
+		mark_free(dynfield2);
+
+		/* init free_flags */
+		for (mask = PKT_FIRST_FREE; mask <= PKT_LAST_FREE; mask <<= 1)
+			shm->free_flags |= mask;
+	}
+#undef mark_free
+
+	return 0;
+}
+
+/* check if this offset can be used */
+static int
+check_offset(size_t offset, size_t size, size_t align, unsigned int flags)
+{
+	size_t i;
+
+	(void)flags;
+
+	if ((offset & (align - 1)) != 0)
+		return -1;
+	if (offset + size > sizeof(struct rte_mbuf))
+		return -1;
+
+	for (i = 0; i < size; i++) {
+		if (!shm->free_space[i + offset])
+			return -1;
+	}
+
+	return 0;
+}
+
+/* assume tailq is locked */
+static struct mbuf_dynfield *
+__mbuf_dynfield_lookup(const char *name)
+{
+	struct mbuf_dynfield_list *mbuf_dynfield_list;
+	struct mbuf_dynfield *mbuf_dynfield;
+	struct rte_tailq_entry *te;
+
+	mbuf_dynfield_list = RTE_TAILQ_CAST(
+		mbuf_dynfield_tailq.head, mbuf_dynfield_list);
+
+	TAILQ_FOREACH(te, mbuf_dynfield_list, next) {
+		mbuf_dynfield = (struct mbuf_dynfield *)te->data;
+		if (strncmp(name, mbuf_dynfield->name,
+				RTE_MBUF_DYN_NAMESIZE) == 0)
+			break;
+	}
+
+	if (te == NULL) {
+		rte_errno = ENOENT;
+		return NULL;
+	}
+
+	return mbuf_dynfield;
+}
+
+int
+rte_mbuf_dynfield_lookup(const char *name, size_t *size, size_t *align)
+{
+	struct mbuf_dynfield *mbuf_dynfield;
+
+	if (shm == NULL) {
+		rte_errno = ENOENT;
+		return -1;
+	}
+
+	rte_mcfg_tailq_read_lock();
+	mbuf_dynfield = __mbuf_dynfield_lookup(name);
+	rte_mcfg_tailq_read_unlock();
+
+	if (mbuf_dynfield == NULL) {
+		rte_errno = ENOENT;
+		return -1;
+	}
+
+	if (size != NULL)
+		*size = mbuf_dynfield->size;
+	if (align != NULL)
+		*align = mbuf_dynfield->align;
+
+	return mbuf_dynfield->offset;
+}
+
+int
+rte_mbuf_dynfield_register(const char *name, size_t size, size_t align,
+			unsigned int flags)
+{
+	struct mbuf_dynfield_list *mbuf_dynfield_list;
+	struct mbuf_dynfield *mbuf_dynfield = NULL;
+	struct rte_tailq_entry *te = NULL;
+	int offset, ret;
+	size_t i;
+
+	if (shm == NULL && init_shared_mem() < 0)
+		goto fail;
+	if (size >= sizeof(struct rte_mbuf)) {
+		rte_errno = EINVAL;
+		goto fail;
+	}
+	if (!rte_is_power_of_2(align)) {
+		rte_errno = EINVAL;
+		goto fail;
+	}
+
+	rte_mcfg_tailq_write_lock();
+
+	mbuf_dynfield = __mbuf_dynfield_lookup(name);
+	if (mbuf_dynfield != NULL) {
+		if (mbuf_dynfield->size != size ||
+				mbuf_dynfield->align != align ||
+				mbuf_dynfield->flags != flags) {
+			rte_errno = EEXIST;
+			goto fail_unlock;
+		}
+		offset = mbuf_dynfield->offset;
+		goto out_unlock;
+	}
+
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
+		rte_errno = EPERM;
+		goto fail_unlock;
+	}
+
+	for (offset = 0;
+	     offset < (int)sizeof(struct rte_mbuf);
+	     offset++) {
+		if (check_offset(offset, size, align, flags) == 0)
+			break;
+	}
+
+	if (offset == sizeof(struct rte_mbuf)) {
+		rte_errno = ENOENT;
+		goto fail_unlock;
+	}
+
+	mbuf_dynfield_list = RTE_TAILQ_CAST(
+		mbuf_dynfield_tailq.head, mbuf_dynfield_list);
+
+	te = rte_zmalloc("MBUF_DYNFIELD_TAILQ_ENTRY", sizeof(*te), 0);
+	if (te == NULL)
+		goto fail_unlock;
+
+	mbuf_dynfield = rte_zmalloc("mbuf_dynfield", sizeof(*mbuf_dynfield), 0);
+	if (mbuf_dynfield == NULL)
+		goto fail_unlock;
+
+	ret = strlcpy(mbuf_dynfield->name, name, sizeof(mbuf_dynfield->name));
+	if (ret < 0 || ret >= (int)sizeof(mbuf_dynfield->name)) {
+		rte_errno = ENAMETOOLONG;
+		goto fail_unlock;
+	}
+	mbuf_dynfield->size = size;
+	mbuf_dynfield->align = align;
+	mbuf_dynfield->flags = flags;
+	mbuf_dynfield->offset = offset;
+	te->data = mbuf_dynfield;
+
+	TAILQ_INSERT_TAIL(mbuf_dynfield_list, te, next);
+
+	for (i = offset; i < offset + size; i++)
+		shm->free_space[i] = 0;
+
+out_unlock:
+	rte_mcfg_tailq_write_unlock();
+
+	return offset;
+
+fail_unlock:
+	rte_mcfg_tailq_write_unlock();
+fail:
+	rte_free(mbuf_dynfield);
+	rte_free(te);
+	return -1;
+}
+
+/* assume tailq is locked */
+static struct mbuf_dynflag *
+__mbuf_dynflag_lookup(const char *name)
+{
+	struct mbuf_dynflag_list *mbuf_dynflag_list;
+	struct mbuf_dynflag *mbuf_dynflag;
+	struct rte_tailq_entry *te;
+
+	mbuf_dynflag_list = RTE_TAILQ_CAST(
+		mbuf_dynflag_tailq.head, mbuf_dynflag_list);
+
+	TAILQ_FOREACH(te, mbuf_dynflag_list, next) {
+		mbuf_dynflag = (struct mbuf_dynflag *)te->data;
+		if (strncmp(name, mbuf_dynflag->name,
+				RTE_MBUF_DYN_NAMESIZE) == 0)
+			break;
+	}
+
+	if (te == NULL) {
+		rte_errno = ENOENT;
+		return NULL;
+	}
+
+	return mbuf_dynflag;
+}
+
+int
+rte_mbuf_dynflag_lookup(const char *name)
+{
+	struct mbuf_dynflag *mbuf_dynflag;
+
+	if (shm == NULL) {
+		rte_errno = ENOENT;
+		return -1;
+	}
+
+	rte_mcfg_tailq_read_lock();
+	mbuf_dynflag = __mbuf_dynflag_lookup(name);
+	rte_mcfg_tailq_read_unlock();
+
+	if (mbuf_dynflag == NULL) {
+		rte_errno = ENOENT;
+		return -1;
+	}
+
+	return mbuf_dynflag->bitnum;
+}
+
+int
+rte_mbuf_dynflag_register(const char *name)
+{
+	struct mbuf_dynflag_list *mbuf_dynflag_list;
+	struct mbuf_dynflag *mbuf_dynflag = NULL;
+	struct rte_tailq_entry *te = NULL;
+	int bitnum, ret;
+
+	if (shm == NULL && init_shared_mem() < 0)
+		goto fail;
+
+	rte_mcfg_tailq_write_lock();
+
+	mbuf_dynflag = __mbuf_dynflag_lookup(name);
+	if (mbuf_dynflag != NULL) {
+		bitnum = mbuf_dynflag->bitnum;
+		goto out_unlock;
+	}
+
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
+		rte_errno = EPERM;
+		goto fail_unlock;
+	}
+
+	if (shm->free_flags == 0) {
+		rte_errno = ENOENT;
+		goto fail_unlock;
+	}
+	bitnum = rte_bsf64(shm->free_flags);
+
+	mbuf_dynflag_list = RTE_TAILQ_CAST(
+		mbuf_dynflag_tailq.head, mbuf_dynflag_list);
+
+	te = rte_zmalloc("MBUF_DYNFLAG_TAILQ_ENTRY", sizeof(*te), 0);
+	if (te == NULL)
+		goto fail_unlock;
+
+	mbuf_dynflag = rte_zmalloc("mbuf_dynflag", sizeof(*mbuf_dynflag), 0);
+	if (mbuf_dynflag == NULL)
+		goto fail_unlock;
+
+	ret = strlcpy(mbuf_dynflag->name, name, sizeof(mbuf_dynflag->name));
+	if (ret < 0 || ret >= (int)sizeof(mbuf_dynflag->name)) {
+		rte_errno = ENAMETOOLONG;
+		goto fail_unlock;
+	}
+	mbuf_dynflag->bitnum = bitnum;
+	te->data = mbuf_dynflag;
+
+	TAILQ_INSERT_TAIL(mbuf_dynflag_list, te, next);
+
+	shm->free_flags &= ~(1ULL << bitnum);
+
+out_unlock:
+	rte_mcfg_tailq_write_unlock();
+
+	return bitnum;
+
+fail_unlock:
+	rte_mcfg_tailq_write_unlock();
+fail:
+	rte_free(mbuf_dynflag);
+	rte_free(te);
+	return -1;
+}
diff --git a/lib/librte_mbuf/rte_mbuf_dyn.h b/lib/librte_mbuf/rte_mbuf_dyn.h
new file mode 100644
index 000000000..a86986a0f
--- /dev/null
+++ b/lib/librte_mbuf/rte_mbuf_dyn.h
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2019 6WIND S.A.
+ */
+
+#ifndef _RTE_MBUF_DYN_H_
+#define _RTE_MBUF_DYN_H_
+
+/**
+ * @file
+ * RTE Mbuf dynamic fields and flags
+ *
+ * Many features require to store data inside the mbuf. As the room in
+ * mbuf structure is limited, it is not possible to have a field for
+ * each feature. Also, changing fields in the mbuf structure can break
+ * the API or ABI.
+ *
+ * This module addresses this issue, by enabling the dynamic
+ * registration of fields or flags:
+ *
+ * - a dynamic field is a named area in the rte_mbuf structure, with a
+ *   given size (>= 1 byte) and alignment constraint.
+ * - a dynamic flag is a named bit in the rte_mbuf structure.
+ *
+ * The typical use case is a PMD that registers space for an offload
+ * feature, when the application requests to enable this feature.  As
+ * the space in mbuf is limited, the space should only be reserved if it
+ * is going to be used (i.e when the application explicitly asks for it).
+ *
+ * The registration can be done at any moment, but it is not possible
+ * to unregister fields or flags for now.
+ *
+ * Example of use:
+ *
+ * - RTE_MBUF_DYN_<feature>_(ID|SIZE|ALIGN) are defined in this file
+ * - If the application asks for the feature, the PMD use
+ *   rte_mbuf_dynfield_register() to get the dynamic offset and stores
+ *   in a global variable.
+ * - The application also calls rte_mbuf_dynfield_register() to get the
+ *   dynamic offset and stores it in a global variable.
+ * - When the field must be used by the PMD or the application, they
+ *   use the RTE_MBUF_DYNFIELD() helper.
+ */
+
+struct rte_mbuf;
+
+/**
+ * Register space for a dynamic field in the mbuf structure.
+ *
+ * @param name
+ *   A string identifying the dynamic field. External applications or
+ *   libraries must not define identifers prefixed with "rte_", which
+ *   are reserved for standard features.
+ * @param size
+ *   The number of bytes to reserve.
+ * @param align
+ *   The alignment constraint, which must be a power of 2.
+ * @param flags
+ *   Reserved for future use.
+ * @return
+ *   The offset in the mbuf structure, or -1 on error (rte_errno is set).
+ */
+__rte_experimental
+int rte_mbuf_dynfield_register(const char *name, size_t size, size_t align,
+			unsigned int flags);
+
+/**
+ * Lookup for a registered dynamic mbuf field.
+ *
+ * @param name
+ *   A string identifying the dynamic field.
+ * @param size
+ *   If not NULL, the number of reserved bytes for this field is stored
+ *   at this address.
+ * @param align
+ *   If not NULL, the alignement constraint for this field is stored
+ *   at this address.
+ * @return
+ *   The offset of this field in the mbuf structure, or -1 on error
+ *   (rte_errno is set).
+ */
+__rte_experimental
+int rte_mbuf_dynfield_lookup(const char *name, size_t *size, size_t *align);
+
+/**
+ * Register a dynamic flag in the mbuf structure.
+ *
+ * @param name
+ *   A string identifying the dynamic flag. External applications or
+ *   libraries must not define identifers prefixed with "rte_", which
+ *   are reserved for standard features.
+ * @return
+ *   The number of the reserved bit, or -1 on error (rte_errno is set).
+ */
+__rte_experimental
+int rte_mbuf_dynflag_register(const char *name);
+
+/**
+ * Lookup for a registered dynamic mbuf flag.
+ *
+ * @param name
+ *   A string identifying the dynamic flag.
+ * @return
+ *   The offset of this flag in the mbuf structure, or -1 on error
+ *   (rte_errno is set).
+ */
+__rte_experimental
+int rte_mbuf_dynflag_lookup(const char *name);
+
+/**
+ * Helper macro to access to a dynamic field.
+ */
+#define RTE_MBUF_DYNFIELD(m, offset, type) ((type)((char *)(m) + (offset)))
+
+/**
+ * Maximum length of the dynamic field or flag string.
+ */
+#define RTE_MBUF_DYN_NAMESIZE 32
+
+#endif
diff --git a/lib/librte_mbuf/rte_mbuf_version.map b/lib/librte_mbuf/rte_mbuf_version.map
index 2662a37bf..a98310570 100644
--- a/lib/librte_mbuf/rte_mbuf_version.map
+++ b/lib/librte_mbuf/rte_mbuf_version.map
@@ -50,4 +50,8 @@ EXPERIMENTAL {
 	global:
 
 	rte_mbuf_check;
+	rte_mbuf_dynfield_lookup;
+	rte_mbuf_dynfield_register;
+	rte_mbuf_dynflag_lookup;
+	rte_mbuf_dynflag_register;
 } DPDK_18.08;
