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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 */
96 * Bit 14~13 used for L4 packet type with checksum enabled.
102 #define PKT_TX_L4_MASK 0x6000 /**< Mask bits for L4 checksum offload request. */
103 #define PKT_TX_L4_NO_CKSUM 0x0000 /**< Disable L4 cksum of TX pkt. */
104 #define PKT_TX_TCP_CKSUM 0x2000 /**< TCP cksum of TX pkt. computed by NIC. */
105 #define PKT_TX_SCTP_CKSUM 0x4000 /**< SCTP cksum of TX pkt. computed by NIC. */
106 #define PKT_TX_UDP_CKSUM 0x6000 /**< UDP cksum of TX pkt. computed by NIC. */
108 #define PKT_TX_IEEE1588_TMST 0x8000 /**< TX IEEE1588 packet to timestamp. */
110 /* Use final bit of flags to indicate a control mbuf */
111 #define CTRL_MBUF_FLAG (1ULL << 63)
114 * Bit Mask to indicate what bits required for building TX context
116 #define PKT_TX_OFFLOAD_MASK (PKT_TX_VLAN_PKT | PKT_TX_IP_CKSUM | PKT_TX_L4_MASK)
118 /* define a set of marker types that can be used to refer to set points in the
120 typedef void *MARKER[0]; /**< generic marker for a point in a structure */
121 typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
122 * with a single assignment */
124 * The generic rte_mbuf, containing a packet mbuf.
129 void *buf_addr; /**< Virtual address of segment buffer. */
130 phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
132 /* next 8 bytes are initialised on RX descriptor rearm */
134 uint16_t buf_len; /**< Length of segment buffer. */
138 * 16-bit Reference counter.
139 * It should only be accessed using the following functions:
140 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
141 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
142 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
146 #ifdef RTE_MBUF_REFCNT
147 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
148 uint16_t refcnt; /**< Non-atomically accessed refcnt */
150 uint16_t refcnt_reserved; /**< Do not use this field */
152 uint8_t nb_segs; /**< Number of segments. */
153 uint8_t port; /**< Input port. */
155 uint64_t ol_flags; /**< Offload features. */
157 /* remaining bytes are set on RX when pulling packet from descriptor */
158 MARKER rx_descriptor_fields1;
159 uint16_t reserved2; /**< Unused field. Required for padding */
160 uint16_t data_len; /**< Amount of data in segment buffer. */
161 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
163 uint16_t l2_l3_len; /**< combined l2/l3 lengths as single var */
165 uint16_t l3_len:9; /**< L3 (IP) Header Length. */
166 uint16_t l2_len:7; /**< L2 (MAC) Header Length. */
169 uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order) */
171 uint32_t rss; /**< RSS hash result if RSS enabled */
175 } fdir; /**< Filter identifier if FDIR enabled */
176 uint32_t sched; /**< Hierarchical scheduler */
177 } hash; /**< hash information */
179 /* second cache line - fields only used in slow path or on TX */
180 MARKER cacheline1 __rte_cache_aligned;
181 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
182 struct rte_mbuf *next; /**< Next segment of scattered packet. */
184 } __rte_cache_aligned;
187 * Given the buf_addr returns the pointer to corresponding mbuf.
189 #define RTE_MBUF_FROM_BADDR(ba) (((struct rte_mbuf *)(ba)) - 1)
192 * Given the pointer to mbuf returns an address where it's buf_addr
195 #define RTE_MBUF_TO_BADDR(mb) (((struct rte_mbuf *)(mb)) + 1)
198 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
200 #define RTE_MBUF_INDIRECT(mb) (RTE_MBUF_FROM_BADDR((mb)->buf_addr) != (mb))
203 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
205 #define RTE_MBUF_DIRECT(mb) (RTE_MBUF_FROM_BADDR((mb)->buf_addr) == (mb))
209 * Private data in case of pktmbuf pool.
211 * A structure that contains some pktmbuf_pool-specific data that are
212 * appended after the mempool structure (in private data).
214 struct rte_pktmbuf_pool_private {
215 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf.*/
218 #ifdef RTE_LIBRTE_MBUF_DEBUG
220 /** check mbuf type in debug mode */
221 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
223 /** check mbuf type in debug mode if mbuf pointer is not null */
224 #define __rte_mbuf_sanity_check_raw(m, is_h) do { \
226 rte_mbuf_sanity_check(m, is_h); \
229 /** MBUF asserts in debug mode */
230 #define RTE_MBUF_ASSERT(exp) \
232 rte_panic("line%d\tassert \"" #exp "\" failed\n", __LINE__); \
235 #else /* RTE_LIBRTE_MBUF_DEBUG */
237 /** check mbuf type in debug mode */
238 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
240 /** check mbuf type in debug mode if mbuf pointer is not null */
241 #define __rte_mbuf_sanity_check_raw(m, is_h) do { } while (0)
243 /** MBUF asserts in debug mode */
244 #define RTE_MBUF_ASSERT(exp) do { } while (0)
246 #endif /* RTE_LIBRTE_MBUF_DEBUG */
248 #ifdef RTE_MBUF_REFCNT
249 #ifdef RTE_MBUF_REFCNT_ATOMIC
252 * Adds given value to an mbuf's refcnt and returns its new value.
256 * Value to add/subtract
260 static inline uint16_t
261 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
263 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
267 * Reads the value of an mbuf's refcnt.
271 * Reference count number.
273 static inline uint16_t
274 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
276 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
280 * Sets an mbuf's refcnt to a defined value.
287 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
289 rte_atomic16_set(&m->refcnt_atomic, new_value);
292 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
295 * Adds given value to an mbuf's refcnt and returns its new value.
297 static inline uint16_t
298 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
300 m->refcnt = (uint16_t)(m->refcnt + value);
305 * Reads the value of an mbuf's refcnt.
307 static inline uint16_t
308 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
314 * Sets an mbuf's refcnt to the defined value.
317 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
319 m->refcnt = new_value;
322 #endif /* RTE_MBUF_REFCNT_ATOMIC */
325 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
330 #else /* ! RTE_MBUF_REFCNT */
333 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { } while(0)
335 #define rte_mbuf_refcnt_set(m,v) do { } while(0)
337 #endif /* RTE_MBUF_REFCNT */
341 * Sanity checks on an mbuf.
343 * Check the consistency of the given mbuf. The function will cause a
344 * panic if corruption is detected.
347 * The mbuf to be checked.
349 * True if the mbuf is a packet header, false if it is a sub-segment
350 * of a packet (in this case, some fields like nb_segs are not checked)
353 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
356 * @internal Allocate a new mbuf from mempool *mp*.
357 * The use of that function is reserved for RTE internal needs.
358 * Please use rte_pktmbuf_alloc().
361 * The mempool from which mbuf is allocated.
363 * - The pointer to the new mbuf on success.
364 * - NULL if allocation failed.
366 static inline struct rte_mbuf *__rte_mbuf_raw_alloc(struct rte_mempool *mp)
370 if (rte_mempool_get(mp, &mb) < 0)
372 m = (struct rte_mbuf *)mb;
373 #ifdef RTE_MBUF_REFCNT
374 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
375 rte_mbuf_refcnt_set(m, 1);
376 #endif /* RTE_MBUF_REFCNT */
381 * @internal Put mbuf back into its original mempool.
382 * The use of that function is reserved for RTE internal needs.
383 * Please use rte_pktmbuf_free().
386 * The mbuf to be freed.
388 static inline void __attribute__((always_inline))
389 __rte_mbuf_raw_free(struct rte_mbuf *m)
391 #ifdef RTE_MBUF_REFCNT
392 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
393 #endif /* RTE_MBUF_REFCNT */
394 rte_mempool_put(m->pool, m);
397 /* Operations on ctrl mbuf */
400 * The control mbuf constructor.
402 * This function initializes some fields in an mbuf structure that are
403 * not modified by the user once created (mbuf type, origin pool, buffer
404 * start address, and so on). This function is given as a callback function
405 * to rte_mempool_create() at pool creation time.
408 * The mempool from which the mbuf is allocated.
410 * A pointer that can be used by the user to retrieve useful information
411 * for mbuf initialization. This pointer comes from the ``init_arg``
412 * parameter of rte_mempool_create().
414 * The mbuf to initialize.
416 * The index of the mbuf in the pool table.
418 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
419 void *m, unsigned i);
422 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
424 * This new mbuf is initialized with data pointing to the beginning of
425 * buffer, and with a length of zero.
428 * The mempool from which the mbuf is allocated.
430 * - The pointer to the new mbuf on success.
431 * - NULL if allocation failed.
433 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
436 * Free a control mbuf back into its original mempool.
439 * The control mbuf to be freed.
441 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
444 * A macro that returns the pointer to the carried data.
446 * The value that can be read or assigned.
451 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
454 * A macro that returns the length of the carried data.
456 * The value that can be read or assigned.
461 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
464 * Tests if an mbuf is a control mbuf
467 * The mbuf to be tested
469 * - True (1) if the mbuf is a control mbuf
470 * - False(0) otherwise
473 rte_is_ctrlmbuf(struct rte_mbuf *m)
475 return (!!(m->ol_flags & CTRL_MBUF_FLAG));
478 /* Operations on pkt mbuf */
481 * The packet mbuf constructor.
483 * This function initializes some fields in the mbuf structure that are
484 * not modified by the user once created (origin pool, buffer start
485 * address, and so on). This function is given as a callback function to
486 * rte_mempool_create() at pool creation time.
489 * The mempool from which mbufs originate.
491 * A pointer that can be used by the user to retrieve useful information
492 * for mbuf initialization. This pointer comes from the ``init_arg``
493 * parameter of rte_mempool_create().
495 * The mbuf to initialize.
497 * The index of the mbuf in the pool table.
499 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
500 void *m, unsigned i);
504 * A packet mbuf pool constructor.
506 * This function initializes the mempool private data in the case of a
507 * pktmbuf pool. This private data is needed by the driver. The
508 * function is given as a callback function to rte_mempool_create() at
509 * pool creation. It can be extended by the user, for example, to
510 * provide another packet size.
513 * The mempool from which mbufs originate.
515 * A pointer that can be used by the user to retrieve useful information
516 * for mbuf initialization. This pointer comes from the ``init_arg``
517 * parameter of rte_mempool_create().
519 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
522 * Reset the fields of a packet mbuf to their default values.
524 * The given mbuf must have only one segment.
527 * The packet mbuf to be resetted.
529 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
539 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
540 RTE_PKTMBUF_HEADROOM : m->buf_len;
543 __rte_mbuf_sanity_check(m, 1);
547 * Allocate a new mbuf from a mempool.
549 * This new mbuf contains one segment, which has a length of 0. The pointer
550 * to data is initialized to have some bytes of headroom in the buffer
551 * (if buffer size allows).
554 * The mempool from which the mbuf is allocated.
556 * - The pointer to the new mbuf on success.
557 * - NULL if allocation failed.
559 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
562 if ((m = __rte_mbuf_raw_alloc(mp)) != NULL)
563 rte_pktmbuf_reset(m);
567 #ifdef RTE_MBUF_REFCNT
570 * Attach packet mbuf to another packet mbuf.
571 * After attachment we refer the mbuf we attached as 'indirect',
572 * while mbuf we attached to as 'direct'.
573 * Right now, not supported:
574 * - attachment to indirect mbuf (e.g. - md has to be direct).
575 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
576 * - mbuf we trying to attach (mi) is used by someone else
577 * e.g. it's reference counter is greater then 1.
580 * The indirect packet mbuf.
582 * The direct packet mbuf.
585 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *md)
587 RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(md) &&
588 RTE_MBUF_DIRECT(mi) &&
589 rte_mbuf_refcnt_read(mi) == 1);
591 rte_mbuf_refcnt_update(md, 1);
592 mi->buf_physaddr = md->buf_physaddr;
593 mi->buf_addr = md->buf_addr;
594 mi->buf_len = md->buf_len;
597 mi->data_off = md->data_off;
598 mi->data_len = md->data_len;
600 mi->vlan_tci = md->vlan_tci;
601 mi->l2_l3_len = md->l2_l3_len;
605 mi->pkt_len = mi->data_len;
607 mi->ol_flags = md->ol_flags;
609 __rte_mbuf_sanity_check(mi, 1);
610 __rte_mbuf_sanity_check(md, 0);
614 * Detach an indirect packet mbuf -
615 * - restore original mbuf address and length values.
616 * - reset pktmbuf data and data_len to their default values.
617 * All other fields of the given packet mbuf will be left intact.
620 * The indirect attached packet mbuf.
623 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
625 const struct rte_mempool *mp = m->pool;
626 void *buf = RTE_MBUF_TO_BADDR(m);
627 uint32_t buf_len = mp->elt_size - sizeof(*m);
628 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + sizeof (*m);
631 m->buf_len = (uint16_t)buf_len;
633 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
634 RTE_PKTMBUF_HEADROOM : m->buf_len;
639 #endif /* RTE_MBUF_REFCNT */
642 static inline struct rte_mbuf* __attribute__((always_inline))
643 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
645 __rte_mbuf_sanity_check(m, 0);
647 #ifdef RTE_MBUF_REFCNT
648 if (likely (rte_mbuf_refcnt_read(m) == 1) ||
649 likely (rte_mbuf_refcnt_update(m, -1) == 0)) {
650 struct rte_mbuf *md = RTE_MBUF_FROM_BADDR(m->buf_addr);
652 rte_mbuf_refcnt_set(m, 0);
654 /* if this is an indirect mbuf, then
656 * - free attached mbuf segment
658 if (unlikely (md != m)) {
659 rte_pktmbuf_detach(m);
660 if (rte_mbuf_refcnt_update(md, -1) == 0)
661 __rte_mbuf_raw_free(md);
665 #ifdef RTE_MBUF_REFCNT
672 * Free a segment of a packet mbuf into its original mempool.
674 * Free an mbuf, without parsing other segments in case of chained
678 * The packet mbuf segment to be freed.
680 static inline void __attribute__((always_inline))
681 rte_pktmbuf_free_seg(struct rte_mbuf *m)
683 if (likely(NULL != (m = __rte_pktmbuf_prefree_seg(m))))
684 __rte_mbuf_raw_free(m);
688 * Free a packet mbuf back into its original mempool.
690 * Free an mbuf, and all its segments in case of chained buffers. Each
691 * segment is added back into its original mempool.
694 * The packet mbuf to be freed.
696 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
698 struct rte_mbuf *m_next;
700 __rte_mbuf_sanity_check(m, 1);
704 rte_pktmbuf_free_seg(m);
709 #ifdef RTE_MBUF_REFCNT
712 * Creates a "clone" of the given packet mbuf.
714 * Walks through all segments of the given packet mbuf, and for each of them:
715 * - Creates a new packet mbuf from the given pool.
716 * - Attaches newly created mbuf to the segment.
717 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
718 * from the original packet mbuf.
721 * The packet mbuf to be cloned.
723 * The mempool from which the "clone" mbufs are allocated.
725 * - The pointer to the new "clone" mbuf on success.
726 * - NULL if allocation fails.
728 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
729 struct rte_mempool *mp)
731 struct rte_mbuf *mc, *mi, **prev;
735 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
740 pktlen = md->pkt_len;
745 rte_pktmbuf_attach(mi, md);
748 } while ((md = md->next) != NULL &&
749 (mi = rte_pktmbuf_alloc(mp)) != NULL);
753 mc->pkt_len = pktlen;
755 /* Allocation of new indirect segment failed */
756 if (unlikely (mi == NULL)) {
757 rte_pktmbuf_free(mc);
761 __rte_mbuf_sanity_check(mc, 1);
766 * Adds given value to the refcnt of all packet mbuf segments.
768 * Walks through all segments of given packet mbuf and for each of them
769 * invokes rte_mbuf_refcnt_update().
772 * The packet mbuf whose refcnt to be updated.
774 * The value to add to the mbuf's segments refcnt.
776 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
778 __rte_mbuf_sanity_check(m, 1);
781 rte_mbuf_refcnt_update(m, v);
782 } while ((m = m->next) != NULL);
785 #endif /* RTE_MBUF_REFCNT */
788 * Get the headroom in a packet mbuf.
793 * The length of the headroom.
795 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
797 __rte_mbuf_sanity_check(m, 1);
802 * Get the tailroom of a packet mbuf.
807 * The length of the tailroom.
809 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
811 __rte_mbuf_sanity_check(m, 1);
812 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
817 * Get the last segment of the packet.
822 * The last segment of the given mbuf.
824 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
826 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
828 __rte_mbuf_sanity_check(m, 1);
829 while (m2->next != NULL)
835 * A macro that points to the start of the data in the mbuf.
837 * The returned pointer is cast to type t. Before using this
838 * function, the user must ensure that m_headlen(m) is large enough to
844 * The type to cast the result into.
846 #define rte_pktmbuf_mtod(m, t) ((t)((char *)(m)->buf_addr + (m)->data_off))
849 * A macro that returns the length of the packet.
851 * The value can be read or assigned.
856 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
859 * A macro that returns the length of the segment.
861 * The value can be read or assigned.
866 #define rte_pktmbuf_data_len(m) ((m)->data_len)
869 * Prepend len bytes to an mbuf data area.
871 * Returns a pointer to the new
872 * data start address. If there is not enough headroom in the first
873 * segment, the function will return NULL, without modifying the mbuf.
878 * The amount of data to prepend (in bytes).
880 * A pointer to the start of the newly prepended data, or
881 * NULL if there is not enough headroom space in the first segment
883 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
886 __rte_mbuf_sanity_check(m, 1);
888 if (unlikely(len > rte_pktmbuf_headroom(m)))
892 m->data_len = (uint16_t)(m->data_len + len);
893 m->pkt_len = (m->pkt_len + len);
895 return (char *)m->buf_addr + m->data_off;
899 * Append len bytes to an mbuf.
901 * Append len bytes to an mbuf and return a pointer to the start address
902 * of the added data. If there is not enough tailroom in the last
903 * segment, the function will return NULL, without modifying the mbuf.
908 * The amount of data to append (in bytes).
910 * A pointer to the start of the newly appended data, or
911 * NULL if there is not enough tailroom space in the last segment
913 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
916 struct rte_mbuf *m_last;
918 __rte_mbuf_sanity_check(m, 1);
920 m_last = rte_pktmbuf_lastseg(m);
921 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
924 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
925 m_last->data_len = (uint16_t)(m_last->data_len + len);
926 m->pkt_len = (m->pkt_len + len);
931 * Remove len bytes at the beginning of an mbuf.
933 * Returns a pointer to the start address of the new data area. If the
934 * length is greater than the length of the first segment, then the
935 * function will fail and return NULL, without modifying the mbuf.
940 * The amount of data to remove (in bytes).
942 * A pointer to the new start of the data.
944 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
946 __rte_mbuf_sanity_check(m, 1);
948 if (unlikely(len > m->data_len))
951 m->data_len = (uint16_t)(m->data_len - len);
953 m->pkt_len = (m->pkt_len - len);
954 return (char *)m->buf_addr + m->data_off;
958 * Remove len bytes of data at the end of the mbuf.
960 * If the length is greater than the length of the last segment, the
961 * function will fail and return -1 without modifying the mbuf.
966 * The amount of data to remove (in bytes).
971 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
973 struct rte_mbuf *m_last;
975 __rte_mbuf_sanity_check(m, 1);
977 m_last = rte_pktmbuf_lastseg(m);
978 if (unlikely(len > m_last->data_len))
981 m_last->data_len = (uint16_t)(m_last->data_len - len);
982 m->pkt_len = (m->pkt_len - len);
987 * Test if mbuf data is contiguous.
992 * - 1, if all data is contiguous (one segment).
993 * - 0, if there is several segments.
995 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
997 __rte_mbuf_sanity_check(m, 1);
998 return !!(m->nb_segs == 1);
1002 * Dump an mbuf structure to the console.
1004 * Dump all fields for the given packet mbuf and all its associated
1005 * segments (in the case of a chained buffer).
1008 * A pointer to a file for output
1012 * If dump_len != 0, also dump the "dump_len" first data bytes of
1015 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1021 #endif /* _RTE_MBUF_H_ */