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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 void *buf_addr; /**< Virtual address of segment buffer. */
119 phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
121 /* next 8 bytes are initialised on RX descriptor rearm */
122 uint16_t buf_len; /**< Length of segment buffer. */
125 #ifdef RTE_MBUF_REFCNT
127 * 16-bit Reference counter.
128 * It should only be accessed using the following functions:
129 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
130 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
131 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
135 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
136 uint16_t refcnt; /**< Non-atomically accessed refcnt */
139 uint16_t refcnt_reserved; /**< Do not use this field */
141 uint8_t nb_segs; /**< Number of segments. */
142 uint8_t port; /**< Input port. */
144 uint16_t ol_flags; /**< Offload features. */
145 uint16_t reserved0; /**< Unused field. Required for padding */
146 uint32_t reserved1; /**< Unused field. Required for padding */
148 /* remaining bytes are set on RX when pulling packet from descriptor */
149 uint16_t reserved2; /**< Unused field. Required for padding */
150 uint16_t data_len; /**< Amount of data in segment buffer. */
151 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
153 uint16_t l2_l3_len; /**< combined l2/l3 lengths as single var */
155 uint16_t l3_len:9; /**< L3 (IP) Header Length. */
156 uint16_t l2_len:7; /**< L2 (MAC) Header Length. */
159 uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order). */
161 uint32_t rss; /**< RSS hash result if RSS enabled */
165 } fdir; /**< Filter identifier if FDIR enabled */
166 uint32_t sched; /**< Hierarchical scheduler */
167 } hash; /**< hash information */
169 /* fields only used in slow path or on TX */
170 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
171 struct rte_mbuf *next; /**< Next segment of scattered packet. */
175 uint16_t metadata16[0];
176 uint32_t metadata32[0];
177 uint64_t metadata64[0];
178 } __rte_cache_aligned;
179 } __rte_cache_aligned;
181 #define RTE_MBUF_METADATA_UINT8(mbuf, offset) \
182 (mbuf->metadata[offset])
183 #define RTE_MBUF_METADATA_UINT16(mbuf, offset) \
184 (mbuf->metadata16[offset/sizeof(uint16_t)])
185 #define RTE_MBUF_METADATA_UINT32(mbuf, offset) \
186 (mbuf->metadata32[offset/sizeof(uint32_t)])
187 #define RTE_MBUF_METADATA_UINT64(mbuf, offset) \
188 (mbuf->metadata64[offset/sizeof(uint64_t)])
190 #define RTE_MBUF_METADATA_UINT8_PTR(mbuf, offset) \
191 (&mbuf->metadata[offset])
192 #define RTE_MBUF_METADATA_UINT16_PTR(mbuf, offset) \
193 (&mbuf->metadata16[offset/sizeof(uint16_t)])
194 #define RTE_MBUF_METADATA_UINT32_PTR(mbuf, offset) \
195 (&mbuf->metadata32[offset/sizeof(uint32_t)])
196 #define RTE_MBUF_METADATA_UINT64_PTR(mbuf, offset) \
197 (&mbuf->metadata64[offset/sizeof(uint64_t)])
200 * Given the buf_addr returns the pointer to corresponding mbuf.
202 #define RTE_MBUF_FROM_BADDR(ba) (((struct rte_mbuf *)(ba)) - 1)
205 * Given the pointer to mbuf returns an address where it's buf_addr
208 #define RTE_MBUF_TO_BADDR(mb) (((struct rte_mbuf *)(mb)) + 1)
211 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
213 #define RTE_MBUF_INDIRECT(mb) (RTE_MBUF_FROM_BADDR((mb)->buf_addr) != (mb))
216 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
218 #define RTE_MBUF_DIRECT(mb) (RTE_MBUF_FROM_BADDR((mb)->buf_addr) == (mb))
222 * Private data in case of pktmbuf pool.
224 * A structure that contains some pktmbuf_pool-specific data that are
225 * appended after the mempool structure (in private data).
227 struct rte_pktmbuf_pool_private {
228 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf.*/
231 #ifdef RTE_LIBRTE_MBUF_DEBUG
233 /** check mbuf type in debug mode */
234 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
236 /** check mbuf type in debug mode if mbuf pointer is not null */
237 #define __rte_mbuf_sanity_check_raw(m, is_h) do { \
239 rte_mbuf_sanity_check(m, is_h); \
242 /** MBUF asserts in debug mode */
243 #define RTE_MBUF_ASSERT(exp) \
245 rte_panic("line%d\tassert \"" #exp "\" failed\n", __LINE__); \
248 #else /* RTE_LIBRTE_MBUF_DEBUG */
250 /** check mbuf type in debug mode */
251 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
253 /** check mbuf type in debug mode if mbuf pointer is not null */
254 #define __rte_mbuf_sanity_check_raw(m, is_h) do { } while (0)
256 /** MBUF asserts in debug mode */
257 #define RTE_MBUF_ASSERT(exp) do { } while (0)
259 #endif /* RTE_LIBRTE_MBUF_DEBUG */
261 #ifdef RTE_MBUF_REFCNT
262 #ifdef RTE_MBUF_REFCNT_ATOMIC
265 * Adds given value to an mbuf's refcnt and returns its new value.
269 * Value to add/subtract
273 static inline uint16_t
274 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
276 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
280 * Reads the value of an mbuf's refcnt.
284 * Reference count number.
286 static inline uint16_t
287 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
289 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
293 * Sets an mbuf's refcnt to a defined value.
300 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
302 rte_atomic16_set(&m->refcnt_atomic, new_value);
305 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
308 * Adds given value to an mbuf's refcnt and returns its new value.
310 static inline uint16_t
311 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
313 m->refcnt = (uint16_t)(m->refcnt + value);
318 * Reads the value of an mbuf's refcnt.
320 static inline uint16_t
321 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
327 * Sets an mbuf's refcnt to the defined value.
330 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
332 m->refcnt = new_value;
335 #endif /* RTE_MBUF_REFCNT_ATOMIC */
338 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
343 #else /* ! RTE_MBUF_REFCNT */
346 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { } while(0)
348 #define rte_mbuf_refcnt_set(m,v) do { } while(0)
350 #endif /* RTE_MBUF_REFCNT */
354 * Sanity checks on an mbuf.
356 * Check the consistency of the given mbuf. The function will cause a
357 * panic if corruption is detected.
360 * The mbuf to be checked.
362 * True if the mbuf is a packet header, false if it is a sub-segment
363 * of a packet (in this case, some fields like nb_segs are not checked)
366 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
369 * @internal Allocate a new mbuf from mempool *mp*.
370 * The use of that function is reserved for RTE internal needs.
371 * Please use rte_pktmbuf_alloc().
374 * The mempool from which mbuf is allocated.
376 * - The pointer to the new mbuf on success.
377 * - NULL if allocation failed.
379 static inline struct rte_mbuf *__rte_mbuf_raw_alloc(struct rte_mempool *mp)
383 if (rte_mempool_get(mp, &mb) < 0)
385 m = (struct rte_mbuf *)mb;
386 #ifdef RTE_MBUF_REFCNT
387 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
388 rte_mbuf_refcnt_set(m, 1);
389 #endif /* RTE_MBUF_REFCNT */
394 * @internal Put mbuf back into its original mempool.
395 * The use of that function is reserved for RTE internal needs.
396 * Please use rte_pktmbuf_free().
399 * The mbuf to be freed.
401 static inline void __attribute__((always_inline))
402 __rte_mbuf_raw_free(struct rte_mbuf *m)
404 #ifdef RTE_MBUF_REFCNT
405 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
406 #endif /* RTE_MBUF_REFCNT */
407 rte_mempool_put(m->pool, m);
410 /* Operations on ctrl mbuf */
413 * The control mbuf constructor.
415 * This function initializes some fields in an mbuf structure that are
416 * not modified by the user once created (mbuf type, origin pool, buffer
417 * start address, and so on). This function is given as a callback function
418 * to rte_mempool_create() at pool creation time.
421 * The mempool from which the mbuf is allocated.
423 * A pointer that can be used by the user to retrieve useful information
424 * for mbuf initialization. This pointer comes from the ``init_arg``
425 * parameter of rte_mempool_create().
427 * The mbuf to initialize.
429 * The index of the mbuf in the pool table.
431 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
432 void *m, unsigned i);
435 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
437 * This new mbuf is initialized with data pointing to the beginning of
438 * buffer, and with a length of zero.
441 * The mempool from which the mbuf is allocated.
443 * - The pointer to the new mbuf on success.
444 * - NULL if allocation failed.
446 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
449 * Free a control mbuf back into its original mempool.
452 * The control mbuf to be freed.
454 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
457 * A macro that returns the pointer to the carried data.
459 * The value that can be read or assigned.
464 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
467 * A macro that returns the length of the carried data.
469 * The value that can be read or assigned.
474 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
476 /* Operations on pkt mbuf */
479 * The packet mbuf constructor.
481 * This function initializes some fields in the mbuf structure that are
482 * not modified by the user once created (origin pool, buffer start
483 * address, and so on). This function is given as a callback function to
484 * rte_mempool_create() at pool creation time.
487 * The mempool from which mbufs originate.
489 * A pointer that can be used by the user to retrieve useful information
490 * for mbuf initialization. This pointer comes from the ``init_arg``
491 * parameter of rte_mempool_create().
493 * The mbuf to initialize.
495 * The index of the mbuf in the pool table.
497 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
498 void *m, unsigned i);
502 * A packet mbuf pool constructor.
504 * This function initializes the mempool private data in the case of a
505 * pktmbuf pool. This private data is needed by the driver. The
506 * function is given as a callback function to rte_mempool_create() at
507 * pool creation. It can be extended by the user, for example, to
508 * provide another packet size.
511 * The mempool from which mbufs originate.
513 * A pointer that can be used by the user to retrieve useful information
514 * for mbuf initialization. This pointer comes from the ``init_arg``
515 * parameter of rte_mempool_create().
517 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
520 * Reset the fields of a packet mbuf to their default values.
522 * The given mbuf must have only one segment.
525 * The packet mbuf to be resetted.
527 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
537 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
538 RTE_PKTMBUF_HEADROOM : m->buf_len;
541 __rte_mbuf_sanity_check(m, 1);
545 * Allocate a new mbuf from a mempool.
547 * This new mbuf contains one segment, which has a length of 0. The pointer
548 * to data is initialized to have some bytes of headroom in the buffer
549 * (if buffer size allows).
552 * The mempool from which the mbuf is allocated.
554 * - The pointer to the new mbuf on success.
555 * - NULL if allocation failed.
557 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
560 if ((m = __rte_mbuf_raw_alloc(mp)) != NULL)
561 rte_pktmbuf_reset(m);
565 #ifdef RTE_MBUF_REFCNT
568 * Attach packet mbuf to another packet mbuf.
569 * After attachment we refer the mbuf we attached as 'indirect',
570 * while mbuf we attached to as 'direct'.
571 * Right now, not supported:
572 * - attachment to indirect mbuf (e.g. - md has to be direct).
573 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
574 * - mbuf we trying to attach (mi) is used by someone else
575 * e.g. it's reference counter is greater then 1.
578 * The indirect packet mbuf.
580 * The direct packet mbuf.
583 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *md)
585 RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(md) &&
586 RTE_MBUF_DIRECT(mi) &&
587 rte_mbuf_refcnt_read(mi) == 1);
589 rte_mbuf_refcnt_update(md, 1);
590 mi->buf_physaddr = md->buf_physaddr;
591 mi->buf_addr = md->buf_addr;
592 mi->buf_len = md->buf_len;
595 mi->data_off = md->data_off;
596 mi->data_len = md->data_len;
598 mi->vlan_tci = md->vlan_tci;
599 mi->l2_l3_len = md->l2_l3_len;
603 mi->pkt_len = mi->data_len;
605 mi->ol_flags = md->ol_flags;
607 __rte_mbuf_sanity_check(mi, 1);
608 __rte_mbuf_sanity_check(md, 0);
612 * Detach an indirect packet mbuf -
613 * - restore original mbuf address and length values.
614 * - reset pktmbuf data and data_len to their default values.
615 * All other fields of the given packet mbuf will be left intact.
618 * The indirect attached packet mbuf.
621 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
623 const struct rte_mempool *mp = m->pool;
624 void *buf = RTE_MBUF_TO_BADDR(m);
625 uint32_t buf_len = mp->elt_size - sizeof(*m);
626 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + sizeof (*m);
629 m->buf_len = (uint16_t)buf_len;
631 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
632 RTE_PKTMBUF_HEADROOM : m->buf_len;
637 #endif /* RTE_MBUF_REFCNT */
640 static inline struct rte_mbuf* __attribute__((always_inline))
641 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
643 __rte_mbuf_sanity_check(m, 0);
645 #ifdef RTE_MBUF_REFCNT
646 if (likely (rte_mbuf_refcnt_read(m) == 1) ||
647 likely (rte_mbuf_refcnt_update(m, -1) == 0)) {
648 struct rte_mbuf *md = RTE_MBUF_FROM_BADDR(m->buf_addr);
650 rte_mbuf_refcnt_set(m, 0);
652 /* if this is an indirect mbuf, then
654 * - free attached mbuf segment
656 if (unlikely (md != m)) {
657 rte_pktmbuf_detach(m);
658 if (rte_mbuf_refcnt_update(md, -1) == 0)
659 __rte_mbuf_raw_free(md);
663 #ifdef RTE_MBUF_REFCNT
670 * Free a segment of a packet mbuf into its original mempool.
672 * Free an mbuf, without parsing other segments in case of chained
676 * The packet mbuf segment to be freed.
678 static inline void __attribute__((always_inline))
679 rte_pktmbuf_free_seg(struct rte_mbuf *m)
681 if (likely(NULL != (m = __rte_pktmbuf_prefree_seg(m))))
682 __rte_mbuf_raw_free(m);
686 * Free a packet mbuf back into its original mempool.
688 * Free an mbuf, and all its segments in case of chained buffers. Each
689 * segment is added back into its original mempool.
692 * The packet mbuf to be freed.
694 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
696 struct rte_mbuf *m_next;
698 __rte_mbuf_sanity_check(m, 1);
702 rte_pktmbuf_free_seg(m);
707 #ifdef RTE_MBUF_REFCNT
710 * Creates a "clone" of the given packet mbuf.
712 * Walks through all segments of the given packet mbuf, and for each of them:
713 * - Creates a new packet mbuf from the given pool.
714 * - Attaches newly created mbuf to the segment.
715 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
716 * from the original packet mbuf.
719 * The packet mbuf to be cloned.
721 * The mempool from which the "clone" mbufs are allocated.
723 * - The pointer to the new "clone" mbuf on success.
724 * - NULL if allocation fails.
726 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
727 struct rte_mempool *mp)
729 struct rte_mbuf *mc, *mi, **prev;
733 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
738 pktlen = md->pkt_len;
743 rte_pktmbuf_attach(mi, md);
746 } while ((md = md->next) != NULL &&
747 (mi = rte_pktmbuf_alloc(mp)) != NULL);
751 mc->pkt_len = pktlen;
753 /* Allocation of new indirect segment failed */
754 if (unlikely (mi == NULL)) {
755 rte_pktmbuf_free(mc);
759 __rte_mbuf_sanity_check(mc, 1);
764 * Adds given value to the refcnt of all packet mbuf segments.
766 * Walks through all segments of given packet mbuf and for each of them
767 * invokes rte_mbuf_refcnt_update().
770 * The packet mbuf whose refcnt to be updated.
772 * The value to add to the mbuf's segments refcnt.
774 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
776 __rte_mbuf_sanity_check(m, 1);
779 rte_mbuf_refcnt_update(m, v);
780 } while ((m = m->next) != NULL);
783 #endif /* RTE_MBUF_REFCNT */
786 * Get the headroom in a packet mbuf.
791 * The length of the headroom.
793 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
795 __rte_mbuf_sanity_check(m, 1);
800 * Get the tailroom of a packet mbuf.
805 * The length of the tailroom.
807 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
809 __rte_mbuf_sanity_check(m, 1);
810 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
815 * Get the last segment of the packet.
820 * The last segment of the given mbuf.
822 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
824 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
826 __rte_mbuf_sanity_check(m, 1);
827 while (m2->next != NULL)
833 * A macro that points to the start of the data in the mbuf.
835 * The returned pointer is cast to type t. Before using this
836 * function, the user must ensure that m_headlen(m) is large enough to
842 * The type to cast the result into.
844 #define rte_pktmbuf_mtod(m, t) ((t)((char *)(m)->buf_addr + (m)->data_off))
847 * A macro that returns the length of the packet.
849 * The value can be read or assigned.
854 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
857 * A macro that returns the length of the segment.
859 * The value can be read or assigned.
864 #define rte_pktmbuf_data_len(m) ((m)->data_len)
867 * Prepend len bytes to an mbuf data area.
869 * Returns a pointer to the new
870 * data start address. If there is not enough headroom in the first
871 * segment, the function will return NULL, without modifying the mbuf.
876 * The amount of data to prepend (in bytes).
878 * A pointer to the start of the newly prepended data, or
879 * NULL if there is not enough headroom space in the first segment
881 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
884 __rte_mbuf_sanity_check(m, 1);
886 if (unlikely(len > rte_pktmbuf_headroom(m)))
890 m->data_len = (uint16_t)(m->data_len + len);
891 m->pkt_len = (m->pkt_len + len);
893 return (char *)m->buf_addr + m->data_off;
897 * Append len bytes to an mbuf.
899 * Append len bytes to an mbuf and return a pointer to the start address
900 * of the added data. If there is not enough tailroom in the last
901 * segment, the function will return NULL, without modifying the mbuf.
906 * The amount of data to append (in bytes).
908 * A pointer to the start of the newly appended data, or
909 * NULL if there is not enough tailroom space in the last segment
911 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
914 struct rte_mbuf *m_last;
916 __rte_mbuf_sanity_check(m, 1);
918 m_last = rte_pktmbuf_lastseg(m);
919 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
922 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
923 m_last->data_len = (uint16_t)(m_last->data_len + len);
924 m->pkt_len = (m->pkt_len + len);
929 * Remove len bytes at the beginning of an mbuf.
931 * Returns a pointer to the start address of the new data area. If the
932 * length is greater than the length of the first segment, then the
933 * function will fail and return NULL, without modifying the mbuf.
938 * The amount of data to remove (in bytes).
940 * A pointer to the new start of the data.
942 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
944 __rte_mbuf_sanity_check(m, 1);
946 if (unlikely(len > m->data_len))
949 m->data_len = (uint16_t)(m->data_len - len);
951 m->pkt_len = (m->pkt_len - len);
952 return (char *)m->buf_addr + m->data_off;
956 * Remove len bytes of data at the end of the mbuf.
958 * If the length is greater than the length of the last segment, the
959 * function will fail and return -1 without modifying the mbuf.
964 * The amount of data to remove (in bytes).
969 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
971 struct rte_mbuf *m_last;
973 __rte_mbuf_sanity_check(m, 1);
975 m_last = rte_pktmbuf_lastseg(m);
976 if (unlikely(len > m_last->data_len))
979 m_last->data_len = (uint16_t)(m_last->data_len - len);
980 m->pkt_len = (m->pkt_len - len);
985 * Test if mbuf data is contiguous.
990 * - 1, if all data is contiguous (one segment).
991 * - 0, if there is several segments.
993 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
995 __rte_mbuf_sanity_check(m, 1);
996 return !!(m->nb_segs == 1);
1000 * Dump an mbuf structure to the console.
1002 * Dump all fields for the given packet mbuf and all its associated
1003 * segments (in the case of a chained buffer).
1006 * A pointer to a file for output
1010 * If dump_len != 0, also dump the "dump_len" first data bytes of
1013 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1019 #endif /* _RTE_MBUF_H_ */