4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 * The mbuf library provides the ability to create and destroy buffers
42 * that may be used by the RTE application to store message
43 * buffers. The message buffers are stored in a mempool, using the
44 * RTE mempool library.
46 * This library provide an API to allocate/free packet mbufs, which are
47 * used to carry network packets.
49 * To understand the concepts of packet buffers or mbufs, you
50 * should read "TCP/IP Illustrated, Volume 2: The Implementation,
51 * Addison-Wesley, 1995, ISBN 0-201-63354-X from Richard Stevens"
52 * http://www.kohala.com/start/tcpipiv2.html
56 #include <rte_mempool.h>
57 #include <rte_atomic.h>
58 #include <rte_prefetch.h>
59 #include <rte_branch_prediction.h>
65 /* deprecated feature, renamed in RTE_MBUF_REFCNT */
66 #pragma GCC poison RTE_MBUF_SCATTER_GATHER
69 * Packet Offload Features Flags. It also carry packet type information.
70 * Critical resources. Both rx/tx shared these bits. Be cautious on any change
72 #define PKT_RX_VLAN_PKT 0x0001 /**< RX packet is a 802.1q VLAN packet. */
73 #define PKT_RX_RSS_HASH 0x0002 /**< RX packet with RSS hash result. */
74 #define PKT_RX_FDIR 0x0004 /**< RX packet with FDIR infos. */
75 #define PKT_RX_L4_CKSUM_BAD 0x0008 /**< L4 cksum of RX pkt. is not OK. */
76 #define PKT_RX_IP_CKSUM_BAD 0x0010 /**< IP cksum of RX pkt. is not OK. */
77 #define PKT_RX_EIP_CKSUM_BAD 0x0000 /**< External IP header checksum error. */
78 #define PKT_RX_OVERSIZE 0x0000 /**< Num of desc of an RX pkt oversize. */
79 #define PKT_RX_HBUF_OVERFLOW 0x0000 /**< Header buffer overflow. */
80 #define PKT_RX_RECIP_ERR 0x0000 /**< Hardware processing error. */
81 #define PKT_RX_MAC_ERR 0x0000 /**< MAC error. */
82 #define PKT_RX_IPV4_HDR 0x0020 /**< RX packet with IPv4 header. */
83 #define PKT_RX_IPV4_HDR_EXT 0x0040 /**< RX packet with extended IPv4 header. */
84 #define PKT_RX_IPV6_HDR 0x0080 /**< RX packet with IPv6 header. */
85 #define PKT_RX_IPV6_HDR_EXT 0x0100 /**< RX packet with extended IPv6 header. */
86 #define PKT_RX_IEEE1588_PTP 0x0200 /**< RX IEEE1588 L2 Ethernet PT Packet. */
87 #define PKT_RX_IEEE1588_TMST 0x0400 /**< RX IEEE1588 L2/L4 timestamped packet.*/
89 #define PKT_TX_VLAN_PKT 0x0800 /**< TX packet is a 802.1q VLAN packet. */
90 #define PKT_TX_IP_CKSUM 0x1000 /**< IP cksum of TX pkt. computed by NIC. */
91 #define PKT_TX_IPV4_CSUM 0x1000 /**< Alias of PKT_TX_IP_CKSUM. */
92 #define PKT_TX_IPV4 PKT_RX_IPV4_HDR /**< IPv4 with no IP checksum offload. */
93 #define PKT_TX_IPV6 PKT_RX_IPV6_HDR /**< IPv6 packet */
95 * Bit 14~13 used for L4 packet type with checksum enabled.
101 #define PKT_TX_L4_MASK 0x6000 /**< Mask bits for L4 checksum offload request. */
102 #define PKT_TX_L4_NO_CKSUM 0x0000 /**< Disable L4 cksum of TX pkt. */
103 #define PKT_TX_TCP_CKSUM 0x2000 /**< TCP cksum of TX pkt. computed by NIC. */
104 #define PKT_TX_SCTP_CKSUM 0x4000 /**< SCTP cksum of TX pkt. computed by NIC. */
105 #define PKT_TX_UDP_CKSUM 0x6000 /**< UDP cksum of TX pkt. computed by NIC. */
107 #define PKT_TX_IEEE1588_TMST 0x8000 /**< TX IEEE1588 packet to timestamp. */
110 * Bit Mask to indicate what bits required for building TX context
112 #define PKT_TX_OFFLOAD_MASK (PKT_TX_VLAN_PKT | PKT_TX_IP_CKSUM | PKT_TX_L4_MASK)
115 * The generic rte_mbuf, containing a packet mbuf.
118 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
119 void *buf_addr; /**< Virtual address of segment buffer. */
120 phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
121 uint16_t buf_len; /**< Length of segment buffer. */
123 /* valid for any segment */
124 struct rte_mbuf *next; /**< Next segment of scattered packet. */
126 uint16_t data_len; /**< Amount of data in segment buffer. */
127 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
129 #ifdef RTE_MBUF_REFCNT
131 * 16-bit Reference counter.
132 * It should only be accessed using the following functions:
133 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
134 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
135 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
139 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
140 uint16_t refcnt; /**< Non-atomically accessed refcnt */
143 uint16_t refcnt_reserved; /**< Do not use this field */
145 uint16_t reserved; /**< Unused field. Required for padding */
146 uint16_t ol_flags; /**< Offload features. */
148 /* these fields are valid for first segment only */
149 uint8_t nb_segs; /**< Number of segments. */
150 uint8_t port; /**< Input port. */
152 /* offload features, valid for first segment only */
154 uint16_t l2_l3_len; /**< combined l2/l3 lengths as single var */
156 uint16_t l3_len:9; /**< L3 (IP) Header Length. */
157 uint16_t l2_len:7; /**< L2 (MAC) Header Length. */
160 uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order). */
162 uint32_t rss; /**< RSS hash result if RSS enabled */
166 } fdir; /**< Filter identifier if FDIR enabled */
167 uint32_t sched; /**< Hierarchical scheduler */
168 } hash; /**< hash information */
172 uint16_t metadata16[0];
173 uint32_t metadata32[0];
174 uint64_t metadata64[0];
175 } __rte_cache_aligned;
176 } __rte_cache_aligned;
178 #define RTE_MBUF_METADATA_UINT8(mbuf, offset) \
179 (mbuf->metadata[offset])
180 #define RTE_MBUF_METADATA_UINT16(mbuf, offset) \
181 (mbuf->metadata16[offset/sizeof(uint16_t)])
182 #define RTE_MBUF_METADATA_UINT32(mbuf, offset) \
183 (mbuf->metadata32[offset/sizeof(uint32_t)])
184 #define RTE_MBUF_METADATA_UINT64(mbuf, offset) \
185 (mbuf->metadata64[offset/sizeof(uint64_t)])
187 #define RTE_MBUF_METADATA_UINT8_PTR(mbuf, offset) \
188 (&mbuf->metadata[offset])
189 #define RTE_MBUF_METADATA_UINT16_PTR(mbuf, offset) \
190 (&mbuf->metadata16[offset/sizeof(uint16_t)])
191 #define RTE_MBUF_METADATA_UINT32_PTR(mbuf, offset) \
192 (&mbuf->metadata32[offset/sizeof(uint32_t)])
193 #define RTE_MBUF_METADATA_UINT64_PTR(mbuf, offset) \
194 (&mbuf->metadata64[offset/sizeof(uint64_t)])
197 * Given the buf_addr returns the pointer to corresponding mbuf.
199 #define RTE_MBUF_FROM_BADDR(ba) (((struct rte_mbuf *)(ba)) - 1)
202 * Given the pointer to mbuf returns an address where it's buf_addr
205 #define RTE_MBUF_TO_BADDR(mb) (((struct rte_mbuf *)(mb)) + 1)
208 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
210 #define RTE_MBUF_INDIRECT(mb) (RTE_MBUF_FROM_BADDR((mb)->buf_addr) != (mb))
213 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
215 #define RTE_MBUF_DIRECT(mb) (RTE_MBUF_FROM_BADDR((mb)->buf_addr) == (mb))
219 * Private data in case of pktmbuf pool.
221 * A structure that contains some pktmbuf_pool-specific data that are
222 * appended after the mempool structure (in private data).
224 struct rte_pktmbuf_pool_private {
225 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf.*/
228 #ifdef RTE_LIBRTE_MBUF_DEBUG
230 /** check mbuf type in debug mode */
231 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
233 /** check mbuf type in debug mode if mbuf pointer is not null */
234 #define __rte_mbuf_sanity_check_raw(m, is_h) do { \
236 rte_mbuf_sanity_check(m, is_h); \
239 /** MBUF asserts in debug mode */
240 #define RTE_MBUF_ASSERT(exp) \
242 rte_panic("line%d\tassert \"" #exp "\" failed\n", __LINE__); \
245 #else /* RTE_LIBRTE_MBUF_DEBUG */
247 /** check mbuf type in debug mode */
248 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
250 /** check mbuf type in debug mode if mbuf pointer is not null */
251 #define __rte_mbuf_sanity_check_raw(m, is_h) do { } while (0)
253 /** MBUF asserts in debug mode */
254 #define RTE_MBUF_ASSERT(exp) do { } while (0)
256 #endif /* RTE_LIBRTE_MBUF_DEBUG */
258 #ifdef RTE_MBUF_REFCNT
259 #ifdef RTE_MBUF_REFCNT_ATOMIC
262 * Adds given value to an mbuf's refcnt and returns its new value.
266 * Value to add/subtract
270 static inline uint16_t
271 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
273 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
277 * Reads the value of an mbuf's refcnt.
281 * Reference count number.
283 static inline uint16_t
284 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
286 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
290 * Sets an mbuf's refcnt to a defined value.
297 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
299 rte_atomic16_set(&m->refcnt_atomic, new_value);
302 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
305 * Adds given value to an mbuf's refcnt and returns its new value.
307 static inline uint16_t
308 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
310 m->refcnt = (uint16_t)(m->refcnt + value);
315 * Reads the value of an mbuf's refcnt.
317 static inline uint16_t
318 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
324 * Sets an mbuf's refcnt to the defined value.
327 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
329 m->refcnt = new_value;
332 #endif /* RTE_MBUF_REFCNT_ATOMIC */
335 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
340 #else /* ! RTE_MBUF_REFCNT */
343 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { } while(0)
345 #define rte_mbuf_refcnt_set(m,v) do { } while(0)
347 #endif /* RTE_MBUF_REFCNT */
351 * Sanity checks on an mbuf.
353 * Check the consistency of the given mbuf. The function will cause a
354 * panic if corruption is detected.
357 * The mbuf to be checked.
359 * True if the mbuf is a packet header, false if it is a sub-segment
360 * of a packet (in this case, some fields like nb_segs are not checked)
363 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
366 * @internal Allocate a new mbuf from mempool *mp*.
367 * The use of that function is reserved for RTE internal needs.
368 * Please use rte_pktmbuf_alloc().
371 * The mempool from which mbuf is allocated.
373 * - The pointer to the new mbuf on success.
374 * - NULL if allocation failed.
376 static inline struct rte_mbuf *__rte_mbuf_raw_alloc(struct rte_mempool *mp)
380 if (rte_mempool_get(mp, &mb) < 0)
382 m = (struct rte_mbuf *)mb;
383 #ifdef RTE_MBUF_REFCNT
384 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
385 rte_mbuf_refcnt_set(m, 1);
386 #endif /* RTE_MBUF_REFCNT */
391 * @internal Put mbuf back into its original mempool.
392 * The use of that function is reserved for RTE internal needs.
393 * Please use rte_pktmbuf_free().
396 * The mbuf to be freed.
398 static inline void __attribute__((always_inline))
399 __rte_mbuf_raw_free(struct rte_mbuf *m)
401 #ifdef RTE_MBUF_REFCNT
402 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
403 #endif /* RTE_MBUF_REFCNT */
404 rte_mempool_put(m->pool, m);
407 /* Operations on ctrl mbuf */
410 * The control mbuf constructor.
412 * This function initializes some fields in an mbuf structure that are
413 * not modified by the user once created (mbuf type, origin pool, buffer
414 * start address, and so on). This function is given as a callback function
415 * to rte_mempool_create() at pool creation time.
418 * The mempool from which the mbuf is allocated.
420 * A pointer that can be used by the user to retrieve useful information
421 * for mbuf initialization. This pointer comes from the ``init_arg``
422 * parameter of rte_mempool_create().
424 * The mbuf to initialize.
426 * The index of the mbuf in the pool table.
428 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
429 void *m, unsigned i);
432 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
434 * This new mbuf is initialized with data pointing to the beginning of
435 * buffer, and with a length of zero.
438 * The mempool from which the mbuf is allocated.
440 * - The pointer to the new mbuf on success.
441 * - NULL if allocation failed.
443 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
446 * Free a control mbuf back into its original mempool.
449 * The control mbuf to be freed.
451 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
454 * A macro that returns the pointer to the carried data.
456 * The value that can be read or assigned.
461 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
464 * A macro that returns the length of the carried data.
466 * The value that can be read or assigned.
471 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
473 /* Operations on pkt mbuf */
476 * The packet mbuf constructor.
478 * This function initializes some fields in the mbuf structure that are
479 * not modified by the user once created (origin pool, buffer start
480 * address, and so on). This function is given as a callback function to
481 * rte_mempool_create() at pool creation time.
484 * The mempool from which mbufs originate.
486 * A pointer that can be used by the user to retrieve useful information
487 * for mbuf initialization. This pointer comes from the ``init_arg``
488 * parameter of rte_mempool_create().
490 * The mbuf to initialize.
492 * The index of the mbuf in the pool table.
494 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
495 void *m, unsigned i);
499 * A packet mbuf pool constructor.
501 * This function initializes the mempool private data in the case of a
502 * pktmbuf pool. This private data is needed by the driver. The
503 * function is given as a callback function to rte_mempool_create() at
504 * pool creation. It can be extended by the user, for example, to
505 * provide another packet size.
508 * The mempool from which mbufs originate.
510 * A pointer that can be used by the user to retrieve useful information
511 * for mbuf initialization. This pointer comes from the ``init_arg``
512 * parameter of rte_mempool_create().
514 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
517 * Reset the fields of a packet mbuf to their default values.
519 * The given mbuf must have only one segment.
522 * The packet mbuf to be resetted.
524 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
534 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
535 RTE_PKTMBUF_HEADROOM : m->buf_len;
538 __rte_mbuf_sanity_check(m, 1);
542 * Allocate a new mbuf from a mempool.
544 * This new mbuf contains one segment, which has a length of 0. The pointer
545 * to data is initialized to have some bytes of headroom in the buffer
546 * (if buffer size allows).
549 * The mempool from which the mbuf is allocated.
551 * - The pointer to the new mbuf on success.
552 * - NULL if allocation failed.
554 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
557 if ((m = __rte_mbuf_raw_alloc(mp)) != NULL)
558 rte_pktmbuf_reset(m);
562 #ifdef RTE_MBUF_REFCNT
565 * Attach packet mbuf to another packet mbuf.
566 * After attachment we refer the mbuf we attached as 'indirect',
567 * while mbuf we attached to as 'direct'.
568 * Right now, not supported:
569 * - attachment to indirect mbuf (e.g. - md has to be direct).
570 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
571 * - mbuf we trying to attach (mi) is used by someone else
572 * e.g. it's reference counter is greater then 1.
575 * The indirect packet mbuf.
577 * The direct packet mbuf.
580 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *md)
582 RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(md) &&
583 RTE_MBUF_DIRECT(mi) &&
584 rte_mbuf_refcnt_read(mi) == 1);
586 rte_mbuf_refcnt_update(md, 1);
587 mi->buf_physaddr = md->buf_physaddr;
588 mi->buf_addr = md->buf_addr;
589 mi->buf_len = md->buf_len;
592 mi->data_off = md->data_off;
593 mi->data_len = md->data_len;
595 mi->vlan_tci = md->vlan_tci;
596 mi->l2_l3_len = md->l2_l3_len;
600 mi->pkt_len = mi->data_len;
602 mi->ol_flags = md->ol_flags;
604 __rte_mbuf_sanity_check(mi, 1);
605 __rte_mbuf_sanity_check(md, 0);
609 * Detach an indirect packet mbuf -
610 * - restore original mbuf address and length values.
611 * - reset pktmbuf data and data_len to their default values.
612 * All other fields of the given packet mbuf will be left intact.
615 * The indirect attached packet mbuf.
618 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
620 const struct rte_mempool *mp = m->pool;
621 void *buf = RTE_MBUF_TO_BADDR(m);
622 uint32_t buf_len = mp->elt_size - sizeof(*m);
623 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + sizeof (*m);
626 m->buf_len = (uint16_t)buf_len;
628 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
629 RTE_PKTMBUF_HEADROOM : m->buf_len;
634 #endif /* RTE_MBUF_REFCNT */
637 static inline struct rte_mbuf* __attribute__((always_inline))
638 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
640 __rte_mbuf_sanity_check(m, 0);
642 #ifdef RTE_MBUF_REFCNT
643 if (likely (rte_mbuf_refcnt_read(m) == 1) ||
644 likely (rte_mbuf_refcnt_update(m, -1) == 0)) {
645 struct rte_mbuf *md = RTE_MBUF_FROM_BADDR(m->buf_addr);
647 rte_mbuf_refcnt_set(m, 0);
649 /* if this is an indirect mbuf, then
651 * - free attached mbuf segment
653 if (unlikely (md != m)) {
654 rte_pktmbuf_detach(m);
655 if (rte_mbuf_refcnt_update(md, -1) == 0)
656 __rte_mbuf_raw_free(md);
660 #ifdef RTE_MBUF_REFCNT
667 * Free a segment of a packet mbuf into its original mempool.
669 * Free an mbuf, without parsing other segments in case of chained
673 * The packet mbuf segment to be freed.
675 static inline void __attribute__((always_inline))
676 rte_pktmbuf_free_seg(struct rte_mbuf *m)
678 if (likely(NULL != (m = __rte_pktmbuf_prefree_seg(m))))
679 __rte_mbuf_raw_free(m);
683 * Free a packet mbuf back into its original mempool.
685 * Free an mbuf, and all its segments in case of chained buffers. Each
686 * segment is added back into its original mempool.
689 * The packet mbuf to be freed.
691 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
693 struct rte_mbuf *m_next;
695 __rte_mbuf_sanity_check(m, 1);
699 rte_pktmbuf_free_seg(m);
704 #ifdef RTE_MBUF_REFCNT
707 * Creates a "clone" of the given packet mbuf.
709 * Walks through all segments of the given packet mbuf, and for each of them:
710 * - Creates a new packet mbuf from the given pool.
711 * - Attaches newly created mbuf to the segment.
712 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
713 * from the original packet mbuf.
716 * The packet mbuf to be cloned.
718 * The mempool from which the "clone" mbufs are allocated.
720 * - The pointer to the new "clone" mbuf on success.
721 * - NULL if allocation fails.
723 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
724 struct rte_mempool *mp)
726 struct rte_mbuf *mc, *mi, **prev;
730 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
735 pktlen = md->pkt_len;
740 rte_pktmbuf_attach(mi, md);
743 } while ((md = md->next) != NULL &&
744 (mi = rte_pktmbuf_alloc(mp)) != NULL);
748 mc->pkt_len = pktlen;
750 /* Allocation of new indirect segment failed */
751 if (unlikely (mi == NULL)) {
752 rte_pktmbuf_free(mc);
756 __rte_mbuf_sanity_check(mc, 1);
761 * Adds given value to the refcnt of all packet mbuf segments.
763 * Walks through all segments of given packet mbuf and for each of them
764 * invokes rte_mbuf_refcnt_update().
767 * The packet mbuf whose refcnt to be updated.
769 * The value to add to the mbuf's segments refcnt.
771 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
773 __rte_mbuf_sanity_check(m, 1);
776 rte_mbuf_refcnt_update(m, v);
777 } while ((m = m->next) != NULL);
780 #endif /* RTE_MBUF_REFCNT */
783 * Get the headroom in a packet mbuf.
788 * The length of the headroom.
790 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
792 __rte_mbuf_sanity_check(m, 1);
797 * Get the tailroom of a packet mbuf.
802 * The length of the tailroom.
804 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
806 __rte_mbuf_sanity_check(m, 1);
807 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
812 * Get the last segment of the packet.
817 * The last segment of the given mbuf.
819 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
821 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
823 __rte_mbuf_sanity_check(m, 1);
824 while (m2->next != NULL)
830 * A macro that points to the start of the data in the mbuf.
832 * The returned pointer is cast to type t. Before using this
833 * function, the user must ensure that m_headlen(m) is large enough to
839 * The type to cast the result into.
841 #define rte_pktmbuf_mtod(m, t) ((t)((char *)(m)->buf_addr + (m)->data_off))
844 * A macro that returns the length of the packet.
846 * The value can be read or assigned.
851 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
854 * A macro that returns the length of the segment.
856 * The value can be read or assigned.
861 #define rte_pktmbuf_data_len(m) ((m)->data_len)
864 * Prepend len bytes to an mbuf data area.
866 * Returns a pointer to the new
867 * data start address. If there is not enough headroom in the first
868 * segment, the function will return NULL, without modifying the mbuf.
873 * The amount of data to prepend (in bytes).
875 * A pointer to the start of the newly prepended data, or
876 * NULL if there is not enough headroom space in the first segment
878 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
881 __rte_mbuf_sanity_check(m, 1);
883 if (unlikely(len > rte_pktmbuf_headroom(m)))
887 m->data_len = (uint16_t)(m->data_len + len);
888 m->pkt_len = (m->pkt_len + len);
890 return (char *)m->buf_addr + m->data_off;
894 * Append len bytes to an mbuf.
896 * Append len bytes to an mbuf and return a pointer to the start address
897 * of the added data. If there is not enough tailroom in the last
898 * segment, the function will return NULL, without modifying the mbuf.
903 * The amount of data to append (in bytes).
905 * A pointer to the start of the newly appended data, or
906 * NULL if there is not enough tailroom space in the last segment
908 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
911 struct rte_mbuf *m_last;
913 __rte_mbuf_sanity_check(m, 1);
915 m_last = rte_pktmbuf_lastseg(m);
916 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
919 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
920 m_last->data_len = (uint16_t)(m_last->data_len + len);
921 m->pkt_len = (m->pkt_len + len);
926 * Remove len bytes at the beginning of an mbuf.
928 * Returns a pointer to the start address of the new data area. If the
929 * length is greater than the length of the first segment, then the
930 * function will fail and return NULL, without modifying the mbuf.
935 * The amount of data to remove (in bytes).
937 * A pointer to the new start of the data.
939 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
941 __rte_mbuf_sanity_check(m, 1);
943 if (unlikely(len > m->data_len))
946 m->data_len = (uint16_t)(m->data_len - len);
948 m->pkt_len = (m->pkt_len - len);
949 return (char *)m->buf_addr + m->data_off;
953 * Remove len bytes of data at the end of the mbuf.
955 * If the length is greater than the length of the last segment, the
956 * function will fail and return -1 without modifying the mbuf.
961 * The amount of data to remove (in bytes).
966 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
968 struct rte_mbuf *m_last;
970 __rte_mbuf_sanity_check(m, 1);
972 m_last = rte_pktmbuf_lastseg(m);
973 if (unlikely(len > m_last->data_len))
976 m_last->data_len = (uint16_t)(m_last->data_len - len);
977 m->pkt_len = (m->pkt_len - len);
982 * Test if mbuf data is contiguous.
987 * - 1, if all data is contiguous (one segment).
988 * - 0, if there is several segments.
990 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
992 __rte_mbuf_sanity_check(m, 1);
993 return !!(m->nb_segs == 1);
997 * Dump an mbuf structure to the console.
999 * Dump all fields for the given packet mbuf and all its associated
1000 * segments (in the case of a chained buffer).
1003 * A pointer to a file for output
1007 * If dump_len != 0, also dump the "dump_len" first data bytes of
1010 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1016 #endif /* _RTE_MBUF_H_ */