X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_mbuf%2Frte_mbuf.c;h=0236fba76bbc5a6b50237e3777df0fb8de91845d;hb=c3a90c381daa68a0ea65906ad15bc96c247ac5cd;hp=52e7574914647324c8d9f05d316fb2e6c0ead30f;hpb=6b4e3fe1bfd08af21027339f53ddcf738f62c831;p=dpdk.git

diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index 52e7574914..0236fba76b 100644
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -1,34 +1,6 @@
-/*-
- *   BSD LICENSE
- *
- *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
- *   All rights reserved.
- *
- *   Redistribution and use in source and binary forms, with or without
- *   modification, are permitted provided that the following conditions
- *   are met:
- *
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyright
- *       notice, this list of conditions and the following disclaimer in
- *       the documentation and/or other materials provided with the
- *       distribution.
- *     * Neither the name of Intel Corporation nor the names of its
- *       contributors may be used to endorse or promote products derived
- *       from this software without specific prior written permission.
- *
- *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation.
+ * Copyright 2014 6WIND S.A.
  */
 
 #include <string.h>
@@ -41,62 +13,62 @@
 #include <ctype.h>
 #include <sys/queue.h>
 
+#include <rte_compat.h>
 #include <rte_debug.h>
 #include <rte_common.h>
 #include <rte_log.h>
 #include <rte_memory.h>
-#include <rte_memzone.h>
 #include <rte_launch.h>
-#include <rte_tailq.h>
 #include <rte_eal.h>
 #include <rte_per_lcore.h>
 #include <rte_lcore.h>
 #include <rte_atomic.h>
 #include <rte_branch_prediction.h>
-#include <rte_ring.h>
 #include <rte_mempool.h>
 #include <rte_mbuf.h>
+#include <rte_mbuf_pool_ops.h>
 #include <rte_string_fns.h>
 #include <rte_hexdump.h>
-
-/*
- * ctrlmbuf constructor, given as a callback function to
- * rte_mempool_create()
- */
-void
-rte_ctrlmbuf_init(struct rte_mempool *mp,
-		__attribute__((unused)) void *opaque_arg,
-		void *_m,
-		__attribute__((unused)) unsigned i)
-{
-	struct rte_mbuf *m = _m;
-	rte_pktmbuf_init(mp, opaque_arg, _m, i);
-	m->ol_flags |= CTRL_MBUF_FLAG;
-}
+#include <rte_errno.h>
+#include <rte_memcpy.h>
 
 /*
  * pktmbuf pool constructor, given as a callback function to
- * rte_mempool_create()
+ * rte_mempool_create(), or called directly if using
+ * rte_mempool_create_empty()/rte_mempool_populate()
  */
 void
 rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg)
 {
-	struct rte_pktmbuf_pool_private *mbp_priv;
+	struct rte_pktmbuf_pool_private *user_mbp_priv, *mbp_priv;
+	struct rte_pktmbuf_pool_private default_mbp_priv;
 	uint16_t roomsz;
 
-	mbp_priv = rte_mempool_get_priv(mp);
-	roomsz = (uint16_t)(uintptr_t)opaque_arg;
+	RTE_ASSERT(mp->elt_size >= sizeof(struct rte_mbuf));
 
-	/* Use default data room size. */
-	if (0 == roomsz)
-		roomsz = 2048 + RTE_PKTMBUF_HEADROOM;
+	/* if no structure is provided, assume no mbuf private area */
+	user_mbp_priv = opaque_arg;
+	if (user_mbp_priv == NULL) {
+		default_mbp_priv.mbuf_priv_size = 0;
+		if (mp->elt_size > sizeof(struct rte_mbuf))
+			roomsz = mp->elt_size - sizeof(struct rte_mbuf);
+		else
+			roomsz = 0;
+		default_mbp_priv.mbuf_data_room_size = roomsz;
+		user_mbp_priv = &default_mbp_priv;
+	}
+
+	RTE_ASSERT(mp->elt_size >= sizeof(struct rte_mbuf) +
+		user_mbp_priv->mbuf_data_room_size +
+		user_mbp_priv->mbuf_priv_size);
 
-	mbp_priv->mbuf_data_room_size = roomsz;
+	mbp_priv = rte_mempool_get_priv(mp);
+	memcpy(mbp_priv, user_mbp_priv, sizeof(*mbp_priv));
 }
 
 /*
  * pktmbuf constructor, given as a callback function to
- * rte_mempool_create().
+ * rte_mempool_obj_iter() or rte_mempool_create().
  * Set the fields of a packet mbuf to their default values.
  */
 void
@@ -106,16 +78,21 @@ rte_pktmbuf_init(struct rte_mempool *mp,
 		 __attribute__((unused)) unsigned i)
 {
 	struct rte_mbuf *m = _m;
-	uint32_t buf_len = mp->elt_size - sizeof(struct rte_mbuf);
+	uint32_t mbuf_size, buf_len, priv_size;
 
-	RTE_MBUF_ASSERT(mp->elt_size >= sizeof(struct rte_mbuf));
+	priv_size = rte_pktmbuf_priv_size(mp);
+	mbuf_size = sizeof(struct rte_mbuf) + priv_size;
+	buf_len = rte_pktmbuf_data_room_size(mp);
 
-	memset(m, 0, mp->elt_size);
+	RTE_ASSERT(RTE_ALIGN(priv_size, RTE_MBUF_PRIV_ALIGN) == priv_size);
+	RTE_ASSERT(mp->elt_size >= mbuf_size);
+	RTE_ASSERT(buf_len <= UINT16_MAX);
 
-	/* start of buffer is just after mbuf structure */
-	m->buf_addr = (char *)m + sizeof(struct rte_mbuf);
-	m->buf_physaddr = rte_mempool_virt2phy(mp, m) +
-			sizeof(struct rte_mbuf);
+	memset(m, 0, mbuf_size);
+	/* start of buffer is after mbuf structure and priv data */
+	m->priv_size = priv_size;
+	m->buf_addr = (char *)m + mbuf_size;
+	m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
 	m->buf_len = (uint16_t)buf_len;
 
 	/* keep some headroom between start of buffer and data */
@@ -124,45 +101,301 @@ rte_pktmbuf_init(struct rte_mempool *mp,
 	/* init some constant fields */
 	m->pool = mp;
 	m->nb_segs = 1;
-	m->port = 0xff;
+	m->port = MBUF_INVALID_PORT;
+	rte_mbuf_refcnt_set(m, 1);
+	m->next = NULL;
+}
+
+/* Helper to create a mbuf pool with given mempool ops name*/
+struct rte_mempool *
+rte_pktmbuf_pool_create_by_ops(const char *name, unsigned int n,
+	unsigned int cache_size, uint16_t priv_size, uint16_t data_room_size,
+	int socket_id, const char *ops_name)
+{
+	struct rte_mempool *mp;
+	struct rte_pktmbuf_pool_private mbp_priv;
+	const char *mp_ops_name = ops_name;
+	unsigned elt_size;
+	int ret;
+
+	if (RTE_ALIGN(priv_size, RTE_MBUF_PRIV_ALIGN) != priv_size) {
+		RTE_LOG(ERR, MBUF, "mbuf priv_size=%u is not aligned\n",
+			priv_size);
+		rte_errno = EINVAL;
+		return NULL;
+	}
+	elt_size = sizeof(struct rte_mbuf) + (unsigned)priv_size +
+		(unsigned)data_room_size;
+	mbp_priv.mbuf_data_room_size = data_room_size;
+	mbp_priv.mbuf_priv_size = priv_size;
+
+	mp = rte_mempool_create_empty(name, n, elt_size, cache_size,
+		 sizeof(struct rte_pktmbuf_pool_private), socket_id, 0);
+	if (mp == NULL)
+		return NULL;
+
+	if (mp_ops_name == NULL)
+		mp_ops_name = rte_mbuf_best_mempool_ops();
+	ret = rte_mempool_set_ops_byname(mp, mp_ops_name, NULL);
+	if (ret != 0) {
+		RTE_LOG(ERR, MBUF, "error setting mempool handler\n");
+		rte_mempool_free(mp);
+		rte_errno = -ret;
+		return NULL;
+	}
+	rte_pktmbuf_pool_init(mp, &mbp_priv);
+
+	ret = rte_mempool_populate_default(mp);
+	if (ret < 0) {
+		rte_mempool_free(mp);
+		rte_errno = -ret;
+		return NULL;
+	}
+
+	rte_mempool_obj_iter(mp, rte_pktmbuf_init, NULL);
+
+	return mp;
+}
+
+/* helper to create a mbuf pool */
+struct rte_mempool *
+rte_pktmbuf_pool_create(const char *name, unsigned int n,
+	unsigned int cache_size, uint16_t priv_size, uint16_t data_room_size,
+	int socket_id)
+{
+	return rte_pktmbuf_pool_create_by_ops(name, n, cache_size, priv_size,
+			data_room_size, socket_id, NULL);
 }
 
 /* do some sanity checks on a mbuf: panic if it fails */
 void
 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header)
 {
-	const struct rte_mbuf *m_seg;
-	unsigned nb_segs;
+	const char *reason;
+
+	if (rte_mbuf_check(m, is_header, &reason))
+		rte_panic("%s\n", reason);
+}
+
+int rte_mbuf_check(const struct rte_mbuf *m, int is_header,
+		   const char **reason)
+{
+	unsigned int nb_segs, pkt_len;
 
-	if (m == NULL)
-		rte_panic("mbuf is NULL\n");
+	if (m == NULL) {
+		*reason = "mbuf is NULL";
+		return -1;
+	}
 
 	/* generic checks */
-	if (m->pool == NULL)
-		rte_panic("bad mbuf pool\n");
-	if (m->buf_physaddr == 0)
-		rte_panic("bad phys addr\n");
-	if (m->buf_addr == NULL)
-		rte_panic("bad virt addr\n");
-
-#ifdef RTE_MBUF_REFCNT
+	if (m->pool == NULL) {
+		*reason = "bad mbuf pool";
+		return -1;
+	}
+	if (m->buf_iova == 0) {
+		*reason = "bad IO addr";
+		return -1;
+	}
+	if (m->buf_addr == NULL) {
+		*reason = "bad virt addr";
+		return -1;
+	}
+
 	uint16_t cnt = rte_mbuf_refcnt_read(m);
-	if ((cnt == 0) || (cnt == UINT16_MAX))
-		rte_panic("bad ref cnt\n");
-#endif
+	if ((cnt == 0) || (cnt == UINT16_MAX)) {
+		*reason = "bad ref cnt";
+		return -1;
+	}
 
 	/* nothing to check for sub-segments */
 	if (is_header == 0)
-		return;
+		return 0;
+
+	/* data_len is supposed to be not more than pkt_len */
+	if (m->data_len > m->pkt_len) {
+		*reason = "bad data_len";
+		return -1;
+	}
 
 	nb_segs = m->nb_segs;
-	m_seg = m;
-	while (m_seg && nb_segs != 0) {
-		m_seg = m_seg->next;
-		nb_segs--;
+	pkt_len = m->pkt_len;
+
+	do {
+		if (m->data_off > m->buf_len) {
+			*reason = "data offset too big in mbuf segment";
+			return -1;
+		}
+		if (m->data_off + m->data_len > m->buf_len) {
+			*reason = "data length too big in mbuf segment";
+			return -1;
+		}
+		nb_segs -= 1;
+		pkt_len -= m->data_len;
+	} while ((m = m->next) != NULL);
+
+	if (nb_segs) {
+		*reason = "bad nb_segs";
+		return -1;
+	}
+	if (pkt_len) {
+		*reason = "bad pkt_len";
+		return -1;
+	}
+
+	return 0;
+}
+
+/* Creates a shallow copy of mbuf */
+struct rte_mbuf *
+rte_pktmbuf_clone(struct rte_mbuf *md, struct rte_mempool *mp)
+{
+	struct rte_mbuf *mc, *mi, **prev;
+	uint32_t pktlen;
+	uint16_t nseg;
+
+	mc = rte_pktmbuf_alloc(mp);
+	if (unlikely(mc == NULL))
+		return NULL;
+
+	mi = mc;
+	prev = &mi->next;
+	pktlen = md->pkt_len;
+	nseg = 0;
+
+	do {
+		nseg++;
+		rte_pktmbuf_attach(mi, md);
+		*prev = mi;
+		prev = &mi->next;
+	} while ((md = md->next) != NULL &&
+	    (mi = rte_pktmbuf_alloc(mp)) != NULL);
+
+	*prev = NULL;
+	mc->nb_segs = nseg;
+	mc->pkt_len = pktlen;
+
+	/* Allocation of new indirect segment failed */
+	if (unlikely(mi == NULL)) {
+		rte_pktmbuf_free(mc);
+		return NULL;
+	}
+
+	__rte_mbuf_sanity_check(mc, 1);
+	return mc;
+}
+
+/* convert multi-segment mbuf to single mbuf */
+int
+__rte_pktmbuf_linearize(struct rte_mbuf *mbuf)
+{
+	size_t seg_len, copy_len;
+	struct rte_mbuf *m;
+	struct rte_mbuf *m_next;
+	char *buffer;
+
+	/* Extend first segment to the total packet length */
+	copy_len = rte_pktmbuf_pkt_len(mbuf) - rte_pktmbuf_data_len(mbuf);
+
+	if (unlikely(copy_len > rte_pktmbuf_tailroom(mbuf)))
+		return -1;
+
+	buffer = rte_pktmbuf_mtod_offset(mbuf, char *, mbuf->data_len);
+	mbuf->data_len = (uint16_t)(mbuf->pkt_len);
+
+	/* Append data from next segments to the first one */
+	m = mbuf->next;
+	while (m != NULL) {
+		m_next = m->next;
+
+		seg_len = rte_pktmbuf_data_len(m);
+		rte_memcpy(buffer, rte_pktmbuf_mtod(m, char *), seg_len);
+		buffer += seg_len;
+
+		rte_pktmbuf_free_seg(m);
+		m = m_next;
+	}
+
+	mbuf->next = NULL;
+	mbuf->nb_segs = 1;
+
+	return 0;
+}
+
+/* Create a deep copy of mbuf */
+struct rte_mbuf *
+rte_pktmbuf_copy(const struct rte_mbuf *m, struct rte_mempool *mp,
+		 uint32_t off, uint32_t len)
+{
+	const struct rte_mbuf *seg = m;
+	struct rte_mbuf *mc, *m_last, **prev;
+
+	/* garbage in check */
+	__rte_mbuf_sanity_check(m, 1);
+
+	/* check for request to copy at offset past end of mbuf */
+	if (unlikely(off >= m->pkt_len))
+		return NULL;
+
+	mc = rte_pktmbuf_alloc(mp);
+	if (unlikely(mc == NULL))
+		return NULL;
+
+	/* truncate requested length to available data */
+	if (len > m->pkt_len - off)
+		len = m->pkt_len - off;
+
+	__rte_pktmbuf_copy_hdr(mc, m);
+
+	/* copied mbuf is not indirect or external */
+	mc->ol_flags = m->ol_flags & ~(IND_ATTACHED_MBUF|EXT_ATTACHED_MBUF);
+
+	prev = &mc->next;
+	m_last = mc;
+	while (len > 0) {
+		uint32_t copy_len;
+
+		/* skip leading mbuf segments */
+		while (off >= seg->data_len) {
+			off -= seg->data_len;
+			seg = seg->next;
+		}
+
+		/* current buffer is full, chain a new one */
+		if (rte_pktmbuf_tailroom(m_last) == 0) {
+			m_last = rte_pktmbuf_alloc(mp);
+			if (unlikely(m_last == NULL)) {
+				rte_pktmbuf_free(mc);
+				return NULL;
+			}
+			++mc->nb_segs;
+			*prev = m_last;
+			prev = &m_last->next;
+		}
+
+		/*
+		 * copy the min of data in input segment (seg)
+		 * vs space available in output (m_last)
+		 */
+		copy_len = RTE_MIN(seg->data_len - off, len);
+		if (copy_len > rte_pktmbuf_tailroom(m_last))
+			copy_len = rte_pktmbuf_tailroom(m_last);
+
+		/* append from seg to m_last */
+		rte_memcpy(rte_pktmbuf_mtod_offset(m_last, char *,
+						   m_last->data_len),
+			   rte_pktmbuf_mtod_offset(seg, char *, off),
+			   copy_len);
+
+		/* update offsets and lengths */
+		m_last->data_len += copy_len;
+		mc->pkt_len += copy_len;
+		off += copy_len;
+		len -= copy_len;
 	}
-	if (nb_segs != 0)
-		rte_panic("bad nb_segs\n");
+
+	/* garbage out check */
+	__rte_mbuf_sanity_check(mc, 1);
+	return mc;
 }
 
 /* dump a mbuf on console */
@@ -170,12 +403,12 @@ void
 rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len)
 {
 	unsigned int len;
-	unsigned nb_segs;
+	unsigned int nb_segs;
 
 	__rte_mbuf_sanity_check(m, 1);
 
-	fprintf(f, "dump mbuf at 0x%p, phys=%"PRIx64", buf_len=%u\n",
-	       m, (uint64_t)m->buf_physaddr, (unsigned)m->buf_len);
+	fprintf(f, "dump mbuf at %p, iova=%"PRIx64", buf_len=%u\n",
+	       m, (uint64_t)m->buf_iova, (unsigned)m->buf_len);
 	fprintf(f, "  pkt_len=%"PRIu32", ol_flags=%"PRIx64", nb_segs=%u, "
 	       "in_port=%u\n", m->pkt_len, m->ol_flags,
 	       (unsigned)m->nb_segs, (unsigned)m->port);
@@ -184,7 +417,7 @@ rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len)
 	while (m && nb_segs != 0) {
 		__rte_mbuf_sanity_check(m, 0);
 
-		fprintf(f, "  segment at 0x%p, data=0x%p, data_len=%u\n",
+		fprintf(f, "  segment at %p, data=%p, data_len=%u\n",
 			m, rte_pktmbuf_mtod(m, void *), (unsigned)m->data_len);
 		len = dump_len;
 		if (len > m->data_len)
@@ -196,3 +429,240 @@ rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len)
 		nb_segs --;
 	}
 }
+
+/* read len data bytes in a mbuf at specified offset (internal) */
+const void *__rte_pktmbuf_read(const struct rte_mbuf *m, uint32_t off,
+	uint32_t len, void *buf)
+{
+	const struct rte_mbuf *seg = m;
+	uint32_t buf_off = 0, copy_len;
+
+	if (off + len > rte_pktmbuf_pkt_len(m))
+		return NULL;
+
+	while (off >= rte_pktmbuf_data_len(seg)) {
+		off -= rte_pktmbuf_data_len(seg);
+		seg = seg->next;
+	}
+
+	if (off + len <= rte_pktmbuf_data_len(seg))
+		return rte_pktmbuf_mtod_offset(seg, char *, off);
+
+	/* rare case: header is split among several segments */
+	while (len > 0) {
+		copy_len = rte_pktmbuf_data_len(seg) - off;
+		if (copy_len > len)
+			copy_len = len;
+		rte_memcpy((char *)buf + buf_off,
+			rte_pktmbuf_mtod_offset(seg, char *, off), copy_len);
+		off = 0;
+		buf_off += copy_len;
+		len -= copy_len;
+		seg = seg->next;
+	}
+
+	return buf;
+}
+
+/*
+ * Get the name of a RX offload flag. Must be kept synchronized with flag
+ * definitions in rte_mbuf.h.
+ */
+const char *rte_get_rx_ol_flag_name(uint64_t mask)
+{
+	switch (mask) {
+	case PKT_RX_VLAN: return "PKT_RX_VLAN";
+	case PKT_RX_RSS_HASH: return "PKT_RX_RSS_HASH";
+	case PKT_RX_FDIR: return "PKT_RX_FDIR";
+	case PKT_RX_L4_CKSUM_BAD: return "PKT_RX_L4_CKSUM_BAD";
+	case PKT_RX_L4_CKSUM_GOOD: return "PKT_RX_L4_CKSUM_GOOD";
+	case PKT_RX_L4_CKSUM_NONE: return "PKT_RX_L4_CKSUM_NONE";
+	case PKT_RX_IP_CKSUM_BAD: return "PKT_RX_IP_CKSUM_BAD";
+	case PKT_RX_IP_CKSUM_GOOD: return "PKT_RX_IP_CKSUM_GOOD";
+	case PKT_RX_IP_CKSUM_NONE: return "PKT_RX_IP_CKSUM_NONE";
+	case PKT_RX_EIP_CKSUM_BAD: return "PKT_RX_EIP_CKSUM_BAD";
+	case PKT_RX_VLAN_STRIPPED: return "PKT_RX_VLAN_STRIPPED";
+	case PKT_RX_IEEE1588_PTP: return "PKT_RX_IEEE1588_PTP";
+	case PKT_RX_IEEE1588_TMST: return "PKT_RX_IEEE1588_TMST";
+	case PKT_RX_FDIR_ID: return "PKT_RX_FDIR_ID";
+	case PKT_RX_FDIR_FLX: return "PKT_RX_FDIR_FLX";
+	case PKT_RX_QINQ_STRIPPED: return "PKT_RX_QINQ_STRIPPED";
+	case PKT_RX_QINQ: return "PKT_RX_QINQ";
+	case PKT_RX_LRO: return "PKT_RX_LRO";
+	case PKT_RX_TIMESTAMP: return "PKT_RX_TIMESTAMP";
+	case PKT_RX_SEC_OFFLOAD: return "PKT_RX_SEC_OFFLOAD";
+	case PKT_RX_SEC_OFFLOAD_FAILED: return "PKT_RX_SEC_OFFLOAD_FAILED";
+	case PKT_RX_OUTER_L4_CKSUM_BAD: return "PKT_RX_OUTER_L4_CKSUM_BAD";
+	case PKT_RX_OUTER_L4_CKSUM_GOOD: return "PKT_RX_OUTER_L4_CKSUM_GOOD";
+	case PKT_RX_OUTER_L4_CKSUM_INVALID:
+		return "PKT_RX_OUTER_L4_CKSUM_INVALID";
+
+	default: return NULL;
+	}
+}
+
+struct flag_mask {
+	uint64_t flag;
+	uint64_t mask;
+	const char *default_name;
+};
+
+/* write the list of rx ol flags in buffer buf */
+int
+rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen)
+{
+	const struct flag_mask rx_flags[] = {
+		{ PKT_RX_VLAN, PKT_RX_VLAN, NULL },
+		{ PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, NULL },
+		{ PKT_RX_FDIR, PKT_RX_FDIR, NULL },
+		{ PKT_RX_L4_CKSUM_BAD, PKT_RX_L4_CKSUM_MASK, NULL },
+		{ PKT_RX_L4_CKSUM_GOOD, PKT_RX_L4_CKSUM_MASK, NULL },
+		{ PKT_RX_L4_CKSUM_NONE, PKT_RX_L4_CKSUM_MASK, NULL },
+		{ PKT_RX_L4_CKSUM_UNKNOWN, PKT_RX_L4_CKSUM_MASK,
+		  "PKT_RX_L4_CKSUM_UNKNOWN" },
+		{ PKT_RX_IP_CKSUM_BAD, PKT_RX_IP_CKSUM_MASK, NULL },
+		{ PKT_RX_IP_CKSUM_GOOD, PKT_RX_IP_CKSUM_MASK, NULL },
+		{ PKT_RX_IP_CKSUM_NONE, PKT_RX_IP_CKSUM_MASK, NULL },
+		{ PKT_RX_IP_CKSUM_UNKNOWN, PKT_RX_IP_CKSUM_MASK,
+		  "PKT_RX_IP_CKSUM_UNKNOWN" },
+		{ PKT_RX_EIP_CKSUM_BAD, PKT_RX_EIP_CKSUM_BAD, NULL },
+		{ PKT_RX_VLAN_STRIPPED, PKT_RX_VLAN_STRIPPED, NULL },
+		{ PKT_RX_IEEE1588_PTP, PKT_RX_IEEE1588_PTP, NULL },
+		{ PKT_RX_IEEE1588_TMST, PKT_RX_IEEE1588_TMST, NULL },
+		{ PKT_RX_FDIR_ID, PKT_RX_FDIR_ID, NULL },
+		{ PKT_RX_FDIR_FLX, PKT_RX_FDIR_FLX, NULL },
+		{ PKT_RX_QINQ_STRIPPED, PKT_RX_QINQ_STRIPPED, NULL },
+		{ PKT_RX_LRO, PKT_RX_LRO, NULL },
+		{ PKT_RX_TIMESTAMP, PKT_RX_TIMESTAMP, NULL },
+		{ PKT_RX_SEC_OFFLOAD, PKT_RX_SEC_OFFLOAD, NULL },
+		{ PKT_RX_SEC_OFFLOAD_FAILED, PKT_RX_SEC_OFFLOAD_FAILED, NULL },
+		{ PKT_RX_QINQ, PKT_RX_QINQ, NULL },
+		{ PKT_RX_OUTER_L4_CKSUM_BAD, PKT_RX_OUTER_L4_CKSUM_MASK, NULL },
+		{ PKT_RX_OUTER_L4_CKSUM_GOOD, PKT_RX_OUTER_L4_CKSUM_MASK,
+		  NULL },
+		{ PKT_RX_OUTER_L4_CKSUM_INVALID, PKT_RX_OUTER_L4_CKSUM_MASK,
+		  NULL },
+		{ PKT_RX_OUTER_L4_CKSUM_UNKNOWN, PKT_RX_OUTER_L4_CKSUM_MASK,
+		  "PKT_RX_OUTER_L4_CKSUM_UNKNOWN" },
+	};
+	const char *name;
+	unsigned int i;
+	int ret;
+
+	if (buflen == 0)
+		return -1;
+
+	buf[0] = '\0';
+	for (i = 0; i < RTE_DIM(rx_flags); i++) {
+		if ((mask & rx_flags[i].mask) != rx_flags[i].flag)
+			continue;
+		name = rte_get_rx_ol_flag_name(rx_flags[i].flag);
+		if (name == NULL)
+			name = rx_flags[i].default_name;
+		ret = snprintf(buf, buflen, "%s ", name);
+		if (ret < 0)
+			return -1;
+		if ((size_t)ret >= buflen)
+			return -1;
+		buf += ret;
+		buflen -= ret;
+	}
+
+	return 0;
+}
+
+/*
+ * Get the name of a TX offload flag. Must be kept synchronized with flag
+ * definitions in rte_mbuf.h.
+ */
+const char *rte_get_tx_ol_flag_name(uint64_t mask)
+{
+	switch (mask) {
+	case PKT_TX_VLAN: return "PKT_TX_VLAN";
+	case PKT_TX_IP_CKSUM: return "PKT_TX_IP_CKSUM";
+	case PKT_TX_TCP_CKSUM: return "PKT_TX_TCP_CKSUM";
+	case PKT_TX_SCTP_CKSUM: return "PKT_TX_SCTP_CKSUM";
+	case PKT_TX_UDP_CKSUM: return "PKT_TX_UDP_CKSUM";
+	case PKT_TX_IEEE1588_TMST: return "PKT_TX_IEEE1588_TMST";
+	case PKT_TX_TCP_SEG: return "PKT_TX_TCP_SEG";
+	case PKT_TX_IPV4: return "PKT_TX_IPV4";
+	case PKT_TX_IPV6: return "PKT_TX_IPV6";
+	case PKT_TX_OUTER_IP_CKSUM: return "PKT_TX_OUTER_IP_CKSUM";
+	case PKT_TX_OUTER_IPV4: return "PKT_TX_OUTER_IPV4";
+	case PKT_TX_OUTER_IPV6: return "PKT_TX_OUTER_IPV6";
+	case PKT_TX_TUNNEL_VXLAN: return "PKT_TX_TUNNEL_VXLAN";
+	case PKT_TX_TUNNEL_GRE: return "PKT_TX_TUNNEL_GRE";
+	case PKT_TX_TUNNEL_IPIP: return "PKT_TX_TUNNEL_IPIP";
+	case PKT_TX_TUNNEL_GENEVE: return "PKT_TX_TUNNEL_GENEVE";
+	case PKT_TX_TUNNEL_MPLSINUDP: return "PKT_TX_TUNNEL_MPLSINUDP";
+	case PKT_TX_TUNNEL_VXLAN_GPE: return "PKT_TX_TUNNEL_VXLAN_GPE";
+	case PKT_TX_TUNNEL_IP: return "PKT_TX_TUNNEL_IP";
+	case PKT_TX_TUNNEL_UDP: return "PKT_TX_TUNNEL_UDP";
+	case PKT_TX_QINQ: return "PKT_TX_QINQ";
+	case PKT_TX_MACSEC: return "PKT_TX_MACSEC";
+	case PKT_TX_SEC_OFFLOAD: return "PKT_TX_SEC_OFFLOAD";
+	case PKT_TX_UDP_SEG: return "PKT_TX_UDP_SEG";
+	case PKT_TX_OUTER_UDP_CKSUM: return "PKT_TX_OUTER_UDP_CKSUM";
+	case PKT_TX_METADATA: return "PKT_TX_METADATA";
+	default: return NULL;
+	}
+}
+
+/* write the list of tx ol flags in buffer buf */
+int
+rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen)
+{
+	const struct flag_mask tx_flags[] = {
+		{ PKT_TX_VLAN, PKT_TX_VLAN, NULL },
+		{ PKT_TX_IP_CKSUM, PKT_TX_IP_CKSUM, NULL },
+		{ PKT_TX_TCP_CKSUM, PKT_TX_L4_MASK, NULL },
+		{ PKT_TX_SCTP_CKSUM, PKT_TX_L4_MASK, NULL },
+		{ PKT_TX_UDP_CKSUM, PKT_TX_L4_MASK, NULL },
+		{ PKT_TX_L4_NO_CKSUM, PKT_TX_L4_MASK, "PKT_TX_L4_NO_CKSUM" },
+		{ PKT_TX_IEEE1588_TMST, PKT_TX_IEEE1588_TMST, NULL },
+		{ PKT_TX_TCP_SEG, PKT_TX_TCP_SEG, NULL },
+		{ PKT_TX_IPV4, PKT_TX_IPV4, NULL },
+		{ PKT_TX_IPV6, PKT_TX_IPV6, NULL },
+		{ PKT_TX_OUTER_IP_CKSUM, PKT_TX_OUTER_IP_CKSUM, NULL },
+		{ PKT_TX_OUTER_IPV4, PKT_TX_OUTER_IPV4, NULL },
+		{ PKT_TX_OUTER_IPV6, PKT_TX_OUTER_IPV6, NULL },
+		{ PKT_TX_TUNNEL_VXLAN, PKT_TX_TUNNEL_MASK, NULL },
+		{ PKT_TX_TUNNEL_GRE, PKT_TX_TUNNEL_MASK, NULL },
+		{ PKT_TX_TUNNEL_IPIP, PKT_TX_TUNNEL_MASK, NULL },
+		{ PKT_TX_TUNNEL_GENEVE, PKT_TX_TUNNEL_MASK, NULL },
+		{ PKT_TX_TUNNEL_MPLSINUDP, PKT_TX_TUNNEL_MASK, NULL },
+		{ PKT_TX_TUNNEL_VXLAN_GPE, PKT_TX_TUNNEL_MASK, NULL },
+		{ PKT_TX_TUNNEL_IP, PKT_TX_TUNNEL_MASK, NULL },
+		{ PKT_TX_TUNNEL_UDP, PKT_TX_TUNNEL_MASK, NULL },
+		{ PKT_TX_QINQ, PKT_TX_QINQ, NULL },
+		{ PKT_TX_MACSEC, PKT_TX_MACSEC, NULL },
+		{ PKT_TX_SEC_OFFLOAD, PKT_TX_SEC_OFFLOAD, NULL },
+		{ PKT_TX_UDP_SEG, PKT_TX_UDP_SEG, NULL },
+		{ PKT_TX_OUTER_UDP_CKSUM, PKT_TX_OUTER_UDP_CKSUM, NULL },
+		{ PKT_TX_METADATA, PKT_TX_METADATA, NULL },
+	};
+	const char *name;
+	unsigned int i;
+	int ret;
+
+	if (buflen == 0)
+		return -1;
+
+	buf[0] = '\0';
+	for (i = 0; i < RTE_DIM(tx_flags); i++) {
+		if ((mask & tx_flags[i].mask) != tx_flags[i].flag)
+			continue;
+		name = rte_get_tx_ol_flag_name(tx_flags[i].flag);
+		if (name == NULL)
+			name = tx_flags[i].default_name;
+		ret = snprintf(buf, buflen, "%s ", name);
+		if (ret < 0)
+			return -1;
+		if ((size_t)ret >= buflen)
+			return -1;
+		buf += ret;
+		buflen -= ret;
+	}
+
+	return 0;
+}