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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 * - RX flags start at bit position zero, and get added to the left of previous
74 * - The most-significant 8 bits are reserved for generic mbuf flags
75 * - TX flags therefore start at bit position 55 (i.e. 63-8), and new flags get
76 * added to the right of the previously defined flags
78 * Keep these flags synchronized with rte_get_rx_ol_flag_name() and
79 * rte_get_tx_ol_flag_name().
81 #define PKT_RX_VLAN_PKT (1ULL << 0) /**< RX packet is a 802.1q VLAN packet. */
82 #define PKT_RX_RSS_HASH (1ULL << 1) /**< RX packet with RSS hash result. */
83 #define PKT_RX_FDIR (1ULL << 2) /**< RX packet with FDIR match indicate. */
84 #define PKT_RX_L4_CKSUM_BAD (1ULL << 3) /**< L4 cksum of RX pkt. is not OK. */
85 #define PKT_RX_IP_CKSUM_BAD (1ULL << 4) /**< IP cksum of RX pkt. is not OK. */
86 #define PKT_RX_EIP_CKSUM_BAD (0ULL << 0) /**< External IP header checksum error. */
87 #define PKT_RX_OVERSIZE (0ULL << 0) /**< Num of desc of an RX pkt oversize. */
88 #define PKT_RX_HBUF_OVERFLOW (0ULL << 0) /**< Header buffer overflow. */
89 #define PKT_RX_RECIP_ERR (0ULL << 0) /**< Hardware processing error. */
90 #define PKT_RX_MAC_ERR (0ULL << 0) /**< MAC error. */
91 #define PKT_RX_IPV4_HDR (1ULL << 5) /**< RX packet with IPv4 header. */
92 #define PKT_RX_IPV4_HDR_EXT (1ULL << 6) /**< RX packet with extended IPv4 header. */
93 #define PKT_RX_IPV6_HDR (1ULL << 7) /**< RX packet with IPv6 header. */
94 #define PKT_RX_IPV6_HDR_EXT (1ULL << 8) /**< RX packet with extended IPv6 header. */
95 #define PKT_RX_IEEE1588_PTP (1ULL << 9) /**< RX IEEE1588 L2 Ethernet PT Packet. */
96 #define PKT_RX_IEEE1588_TMST (1ULL << 10) /**< RX IEEE1588 L2/L4 timestamped packet.*/
97 #define PKT_RX_TUNNEL_IPV4_HDR (1ULL << 11) /**< RX tunnel packet with IPv4 header.*/
98 #define PKT_RX_TUNNEL_IPV6_HDR (1ULL << 12) /**< RX tunnel packet with IPv6 header. */
99 #define PKT_RX_FDIR_ID (1ULL << 13) /**< FD id reported if FDIR match. */
100 #define PKT_RX_FDIR_FLX (1ULL << 14) /**< Flexible bytes reported if FDIR match. */
101 /* add new RX flags here */
103 /* add new TX flags here */
104 #define PKT_TX_VXLAN_CKSUM (1ULL << 50) /**< TX checksum of VXLAN computed by NIC */
105 #define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
108 * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
109 * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
110 * L4 checksum offload, the user needs to:
111 * - fill l2_len and l3_len in mbuf
112 * - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
113 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
114 * - calculate the pseudo header checksum and set it in the L4 header (only
115 * for TCP or UDP). For SCTP, set the crc field to 0.
117 #define PKT_TX_L4_NO_CKSUM (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
118 #define PKT_TX_TCP_CKSUM (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */
119 #define PKT_TX_SCTP_CKSUM (2ULL << 52) /**< SCTP cksum of TX pkt. computed by NIC. */
120 #define PKT_TX_UDP_CKSUM (3ULL << 52) /**< UDP cksum of TX pkt. computed by NIC. */
121 #define PKT_TX_L4_MASK (3ULL << 52) /**< Mask for L4 cksum offload request. */
123 #define PKT_TX_IP_CKSUM (1ULL << 54) /**< IP cksum of TX pkt. computed by NIC. */
124 #define PKT_TX_IPV4_CSUM PKT_TX_IP_CKSUM /**< Alias of PKT_TX_IP_CKSUM. */
126 /** Tell the NIC it's an IPv4 packet. Required for L4 checksum offload. */
127 #define PKT_TX_IPV4 PKT_RX_IPV4_HDR
129 /** Tell the NIC it's an IPv6 packet. Required for L4 checksum offload. */
130 #define PKT_TX_IPV6 PKT_RX_IPV6_HDR
132 #define PKT_TX_VLAN_PKT (1ULL << 55) /**< TX packet is a 802.1q VLAN packet. */
134 /* Use final bit of flags to indicate a control mbuf */
135 #define CTRL_MBUF_FLAG (1ULL << 63) /**< Mbuf contains control data */
138 * Get the name of a RX offload flag
141 * The mask describing the flag.
143 * The name of this flag, or NULL if it's not a valid RX flag.
145 const char *rte_get_rx_ol_flag_name(uint64_t mask);
148 * Get the name of a TX offload flag
151 * The mask describing the flag. Usually only one bit must be set.
152 * Several bits can be given if they belong to the same mask.
153 * Ex: PKT_TX_L4_MASK.
155 * The name of this flag, or NULL if it's not a valid TX flag.
157 const char *rte_get_tx_ol_flag_name(uint64_t mask);
159 /* define a set of marker types that can be used to refer to set points in the
161 typedef void *MARKER[0]; /**< generic marker for a point in a structure */
162 typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
163 * with a single assignment */
165 * The generic rte_mbuf, containing a packet mbuf.
170 void *buf_addr; /**< Virtual address of segment buffer. */
171 phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
173 /* next 8 bytes are initialised on RX descriptor rearm */
175 uint16_t buf_len; /**< Length of segment buffer. */
179 * 16-bit Reference counter.
180 * It should only be accessed using the following functions:
181 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
182 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
183 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
187 #ifdef RTE_MBUF_REFCNT
188 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
189 uint16_t refcnt; /**< Non-atomically accessed refcnt */
191 uint16_t refcnt_reserved; /**< Do not use this field */
193 uint8_t nb_segs; /**< Number of segments. */
194 uint8_t port; /**< Input port. */
196 uint64_t ol_flags; /**< Offload features. */
198 /* remaining bytes are set on RX when pulling packet from descriptor */
199 MARKER rx_descriptor_fields1;
202 * The packet type, which is used to indicate ordinary packet and also
203 * tunneled packet format, i.e. each number is represented a type of
206 uint16_t packet_type;
208 uint16_t data_len; /**< Amount of data in segment buffer. */
209 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
210 uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order) */
213 uint32_t rss; /**< RSS hash result if RSS enabled */
221 /**< Second 4 flexible bytes */
224 /**< First 4 flexible bytes or FD ID, dependent on
225 PKT_RX_FDIR_* flag in ol_flags. */
226 } fdir; /**< Filter identifier if FDIR enabled */
227 uint32_t sched; /**< Hierarchical scheduler */
228 uint32_t usr; /**< User defined tags. See @rte_distributor_process */
229 } hash; /**< hash information */
231 /* second cache line - fields only used in slow path or on TX */
232 MARKER cacheline1 __rte_cache_aligned;
235 void *userdata; /**< Can be used for external metadata */
236 uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
239 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
240 struct rte_mbuf *next; /**< Next segment of scattered packet. */
242 /* fields to support TX offloads */
244 uint16_t l2_l3_len; /**< combined l2/l3 lengths as single var */
246 uint16_t l3_len:9; /**< L3 (IP) Header Length. */
247 uint16_t l2_len:7; /**< L2 (MAC) Header Length. */
251 /* fields for TX offloading of tunnels */
253 uint16_t inner_l2_l3_len;
254 /**< combined inner l2/l3 lengths as single var */
256 uint16_t inner_l3_len:9;
257 /**< inner L3 (IP) Header Length. */
258 uint16_t inner_l2_len:7;
259 /**< inner L2 (MAC) Header Length. */
262 } __rte_cache_aligned;
265 * Given the buf_addr returns the pointer to corresponding mbuf.
267 #define RTE_MBUF_FROM_BADDR(ba) (((struct rte_mbuf *)(ba)) - 1)
270 * Given the pointer to mbuf returns an address where it's buf_addr
273 #define RTE_MBUF_TO_BADDR(mb) (((struct rte_mbuf *)(mb)) + 1)
276 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
278 #define RTE_MBUF_INDIRECT(mb) (RTE_MBUF_FROM_BADDR((mb)->buf_addr) != (mb))
281 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
283 #define RTE_MBUF_DIRECT(mb) (RTE_MBUF_FROM_BADDR((mb)->buf_addr) == (mb))
287 * Private data in case of pktmbuf pool.
289 * A structure that contains some pktmbuf_pool-specific data that are
290 * appended after the mempool structure (in private data).
292 struct rte_pktmbuf_pool_private {
293 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf.*/
296 #ifdef RTE_LIBRTE_MBUF_DEBUG
298 /** check mbuf type in debug mode */
299 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
301 /** check mbuf type in debug mode if mbuf pointer is not null */
302 #define __rte_mbuf_sanity_check_raw(m, is_h) do { \
304 rte_mbuf_sanity_check(m, is_h); \
307 /** MBUF asserts in debug mode */
308 #define RTE_MBUF_ASSERT(exp) \
310 rte_panic("line%d\tassert \"" #exp "\" failed\n", __LINE__); \
313 #else /* RTE_LIBRTE_MBUF_DEBUG */
315 /** check mbuf type in debug mode */
316 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
318 /** check mbuf type in debug mode if mbuf pointer is not null */
319 #define __rte_mbuf_sanity_check_raw(m, is_h) do { } while (0)
321 /** MBUF asserts in debug mode */
322 #define RTE_MBUF_ASSERT(exp) do { } while (0)
324 #endif /* RTE_LIBRTE_MBUF_DEBUG */
326 #ifdef RTE_MBUF_REFCNT
327 #ifdef RTE_MBUF_REFCNT_ATOMIC
330 * Adds given value to an mbuf's refcnt and returns its new value.
334 * Value to add/subtract
338 static inline uint16_t
339 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
341 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
345 * Reads the value of an mbuf's refcnt.
349 * Reference count number.
351 static inline uint16_t
352 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
354 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
358 * Sets an mbuf's refcnt to a defined value.
365 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
367 rte_atomic16_set(&m->refcnt_atomic, new_value);
370 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
373 * Adds given value to an mbuf's refcnt and returns its new value.
375 static inline uint16_t
376 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
378 m->refcnt = (uint16_t)(m->refcnt + value);
383 * Reads the value of an mbuf's refcnt.
385 static inline uint16_t
386 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
392 * Sets an mbuf's refcnt to the defined value.
395 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
397 m->refcnt = new_value;
400 #endif /* RTE_MBUF_REFCNT_ATOMIC */
403 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
408 #else /* ! RTE_MBUF_REFCNT */
411 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { } while(0)
413 #define rte_mbuf_refcnt_set(m,v) do { } while(0)
415 #endif /* RTE_MBUF_REFCNT */
419 * Sanity checks on an mbuf.
421 * Check the consistency of the given mbuf. The function will cause a
422 * panic if corruption is detected.
425 * The mbuf to be checked.
427 * True if the mbuf is a packet header, false if it is a sub-segment
428 * of a packet (in this case, some fields like nb_segs are not checked)
431 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
434 * @internal Allocate a new mbuf from mempool *mp*.
435 * The use of that function is reserved for RTE internal needs.
436 * Please use rte_pktmbuf_alloc().
439 * The mempool from which mbuf is allocated.
441 * - The pointer to the new mbuf on success.
442 * - NULL if allocation failed.
444 static inline struct rte_mbuf *__rte_mbuf_raw_alloc(struct rte_mempool *mp)
448 if (rte_mempool_get(mp, &mb) < 0)
450 m = (struct rte_mbuf *)mb;
451 #ifdef RTE_MBUF_REFCNT
452 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
453 rte_mbuf_refcnt_set(m, 1);
454 #endif /* RTE_MBUF_REFCNT */
459 * @internal Put mbuf back into its original mempool.
460 * The use of that function is reserved for RTE internal needs.
461 * Please use rte_pktmbuf_free().
464 * The mbuf to be freed.
466 static inline void __attribute__((always_inline))
467 __rte_mbuf_raw_free(struct rte_mbuf *m)
469 #ifdef RTE_MBUF_REFCNT
470 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
471 #endif /* RTE_MBUF_REFCNT */
472 rte_mempool_put(m->pool, m);
475 /* Operations on ctrl mbuf */
478 * The control mbuf constructor.
480 * This function initializes some fields in an mbuf structure that are
481 * not modified by the user once created (mbuf type, origin pool, buffer
482 * start address, and so on). This function is given as a callback function
483 * to rte_mempool_create() at pool creation time.
486 * The mempool from which the mbuf is allocated.
488 * A pointer that can be used by the user to retrieve useful information
489 * for mbuf initialization. This pointer comes from the ``init_arg``
490 * parameter of rte_mempool_create().
492 * The mbuf to initialize.
494 * The index of the mbuf in the pool table.
496 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
497 void *m, unsigned i);
500 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
502 * This new mbuf is initialized with data pointing to the beginning of
503 * buffer, and with a length of zero.
506 * The mempool from which the mbuf is allocated.
508 * - The pointer to the new mbuf on success.
509 * - NULL if allocation failed.
511 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
514 * Free a control mbuf back into its original mempool.
517 * The control mbuf to be freed.
519 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
522 * A macro that returns the pointer to the carried data.
524 * The value that can be read or assigned.
529 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
532 * A macro that returns the length of the carried data.
534 * The value that can be read or assigned.
539 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
542 * Tests if an mbuf is a control mbuf
545 * The mbuf to be tested
547 * - True (1) if the mbuf is a control mbuf
548 * - False(0) otherwise
551 rte_is_ctrlmbuf(struct rte_mbuf *m)
553 return (!!(m->ol_flags & CTRL_MBUF_FLAG));
556 /* Operations on pkt mbuf */
559 * The packet mbuf constructor.
561 * This function initializes some fields in the mbuf structure that are
562 * not modified by the user once created (origin pool, buffer start
563 * address, and so on). This function is given as a callback function to
564 * rte_mempool_create() at pool creation time.
567 * The mempool from which mbufs originate.
569 * A pointer that can be used by the user to retrieve useful information
570 * for mbuf initialization. This pointer comes from the ``init_arg``
571 * parameter of rte_mempool_create().
573 * The mbuf to initialize.
575 * The index of the mbuf in the pool table.
577 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
578 void *m, unsigned i);
582 * A packet mbuf pool constructor.
584 * This function initializes the mempool private data in the case of a
585 * pktmbuf pool. This private data is needed by the driver. The
586 * function is given as a callback function to rte_mempool_create() at
587 * pool creation. It can be extended by the user, for example, to
588 * provide another packet size.
591 * The mempool from which mbufs originate.
593 * A pointer that can be used by the user to retrieve useful information
594 * for mbuf initialization. This pointer comes from the ``init_arg``
595 * parameter of rte_mempool_create().
597 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
600 * Reset the fields of a packet mbuf to their default values.
602 * The given mbuf must have only one segment.
605 * The packet mbuf to be resetted.
607 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
612 m->inner_l2_l3_len = 0;
619 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
620 RTE_PKTMBUF_HEADROOM : m->buf_len;
623 __rte_mbuf_sanity_check(m, 1);
627 * Allocate a new mbuf from a mempool.
629 * This new mbuf contains one segment, which has a length of 0. The pointer
630 * to data is initialized to have some bytes of headroom in the buffer
631 * (if buffer size allows).
634 * The mempool from which the mbuf is allocated.
636 * - The pointer to the new mbuf on success.
637 * - NULL if allocation failed.
639 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
642 if ((m = __rte_mbuf_raw_alloc(mp)) != NULL)
643 rte_pktmbuf_reset(m);
647 #ifdef RTE_MBUF_REFCNT
650 * Attach packet mbuf to another packet mbuf.
651 * After attachment we refer the mbuf we attached as 'indirect',
652 * while mbuf we attached to as 'direct'.
653 * Right now, not supported:
654 * - attachment to indirect mbuf (e.g. - md has to be direct).
655 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
656 * - mbuf we trying to attach (mi) is used by someone else
657 * e.g. it's reference counter is greater then 1.
660 * The indirect packet mbuf.
662 * The direct packet mbuf.
665 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *md)
667 RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(md) &&
668 RTE_MBUF_DIRECT(mi) &&
669 rte_mbuf_refcnt_read(mi) == 1);
671 rte_mbuf_refcnt_update(md, 1);
672 mi->buf_physaddr = md->buf_physaddr;
673 mi->buf_addr = md->buf_addr;
674 mi->buf_len = md->buf_len;
677 mi->data_off = md->data_off;
678 mi->data_len = md->data_len;
680 mi->vlan_tci = md->vlan_tci;
681 mi->l2_l3_len = md->l2_l3_len;
682 mi->inner_l2_l3_len = md->inner_l2_l3_len;
686 mi->pkt_len = mi->data_len;
688 mi->ol_flags = md->ol_flags;
689 mi->packet_type = md->packet_type;
691 __rte_mbuf_sanity_check(mi, 1);
692 __rte_mbuf_sanity_check(md, 0);
696 * Detach an indirect packet mbuf -
697 * - restore original mbuf address and length values.
698 * - reset pktmbuf data and data_len to their default values.
699 * All other fields of the given packet mbuf will be left intact.
702 * The indirect attached packet mbuf.
705 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
707 const struct rte_mempool *mp = m->pool;
708 void *buf = RTE_MBUF_TO_BADDR(m);
709 uint32_t buf_len = mp->elt_size - sizeof(*m);
710 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + sizeof (*m);
713 m->buf_len = (uint16_t)buf_len;
715 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
716 RTE_PKTMBUF_HEADROOM : m->buf_len;
721 #endif /* RTE_MBUF_REFCNT */
724 static inline struct rte_mbuf* __attribute__((always_inline))
725 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
727 __rte_mbuf_sanity_check(m, 0);
729 #ifdef RTE_MBUF_REFCNT
730 if (likely (rte_mbuf_refcnt_read(m) == 1) ||
731 likely (rte_mbuf_refcnt_update(m, -1) == 0)) {
732 struct rte_mbuf *md = RTE_MBUF_FROM_BADDR(m->buf_addr);
734 rte_mbuf_refcnt_set(m, 0);
736 /* if this is an indirect mbuf, then
738 * - free attached mbuf segment
740 if (unlikely (md != m)) {
741 rte_pktmbuf_detach(m);
742 if (rte_mbuf_refcnt_update(md, -1) == 0)
743 __rte_mbuf_raw_free(md);
747 #ifdef RTE_MBUF_REFCNT
754 * Free a segment of a packet mbuf into its original mempool.
756 * Free an mbuf, without parsing other segments in case of chained
760 * The packet mbuf segment to be freed.
762 static inline void __attribute__((always_inline))
763 rte_pktmbuf_free_seg(struct rte_mbuf *m)
765 if (likely(NULL != (m = __rte_pktmbuf_prefree_seg(m)))) {
767 __rte_mbuf_raw_free(m);
772 * Free a packet mbuf back into its original mempool.
774 * Free an mbuf, and all its segments in case of chained buffers. Each
775 * segment is added back into its original mempool.
778 * The packet mbuf to be freed.
780 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
782 struct rte_mbuf *m_next;
784 __rte_mbuf_sanity_check(m, 1);
788 rte_pktmbuf_free_seg(m);
793 #ifdef RTE_MBUF_REFCNT
796 * Creates a "clone" of the given packet mbuf.
798 * Walks through all segments of the given packet mbuf, and for each of them:
799 * - Creates a new packet mbuf from the given pool.
800 * - Attaches newly created mbuf to the segment.
801 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
802 * from the original packet mbuf.
805 * The packet mbuf to be cloned.
807 * The mempool from which the "clone" mbufs are allocated.
809 * - The pointer to the new "clone" mbuf on success.
810 * - NULL if allocation fails.
812 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
813 struct rte_mempool *mp)
815 struct rte_mbuf *mc, *mi, **prev;
819 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
824 pktlen = md->pkt_len;
829 rte_pktmbuf_attach(mi, md);
832 } while ((md = md->next) != NULL &&
833 (mi = rte_pktmbuf_alloc(mp)) != NULL);
837 mc->pkt_len = pktlen;
839 /* Allocation of new indirect segment failed */
840 if (unlikely (mi == NULL)) {
841 rte_pktmbuf_free(mc);
845 __rte_mbuf_sanity_check(mc, 1);
850 * Adds given value to the refcnt of all packet mbuf segments.
852 * Walks through all segments of given packet mbuf and for each of them
853 * invokes rte_mbuf_refcnt_update().
856 * The packet mbuf whose refcnt to be updated.
858 * The value to add to the mbuf's segments refcnt.
860 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
862 __rte_mbuf_sanity_check(m, 1);
865 rte_mbuf_refcnt_update(m, v);
866 } while ((m = m->next) != NULL);
869 #endif /* RTE_MBUF_REFCNT */
872 * Get the headroom in a packet mbuf.
877 * The length of the headroom.
879 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
881 __rte_mbuf_sanity_check(m, 1);
886 * Get the tailroom of a packet mbuf.
891 * The length of the tailroom.
893 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
895 __rte_mbuf_sanity_check(m, 1);
896 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
901 * Get the last segment of the packet.
906 * The last segment of the given mbuf.
908 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
910 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
912 __rte_mbuf_sanity_check(m, 1);
913 while (m2->next != NULL)
919 * A macro that points to the start of the data in the mbuf.
921 * The returned pointer is cast to type t. Before using this
922 * function, the user must ensure that m_headlen(m) is large enough to
928 * The type to cast the result into.
930 #define rte_pktmbuf_mtod(m, t) ((t)((char *)(m)->buf_addr + (m)->data_off))
933 * A macro that returns the length of the packet.
935 * The value can be read or assigned.
940 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
943 * A macro that returns the length of the segment.
945 * The value can be read or assigned.
950 #define rte_pktmbuf_data_len(m) ((m)->data_len)
953 * Prepend len bytes to an mbuf data area.
955 * Returns a pointer to the new
956 * data start address. If there is not enough headroom in the first
957 * segment, the function will return NULL, without modifying the mbuf.
962 * The amount of data to prepend (in bytes).
964 * A pointer to the start of the newly prepended data, or
965 * NULL if there is not enough headroom space in the first segment
967 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
970 __rte_mbuf_sanity_check(m, 1);
972 if (unlikely(len > rte_pktmbuf_headroom(m)))
976 m->data_len = (uint16_t)(m->data_len + len);
977 m->pkt_len = (m->pkt_len + len);
979 return (char *)m->buf_addr + m->data_off;
983 * Append len bytes to an mbuf.
985 * Append len bytes to an mbuf and return a pointer to the start address
986 * of the added data. If there is not enough tailroom in the last
987 * segment, the function will return NULL, without modifying the mbuf.
992 * The amount of data to append (in bytes).
994 * A pointer to the start of the newly appended data, or
995 * NULL if there is not enough tailroom space in the last segment
997 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
1000 struct rte_mbuf *m_last;
1002 __rte_mbuf_sanity_check(m, 1);
1004 m_last = rte_pktmbuf_lastseg(m);
1005 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
1008 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
1009 m_last->data_len = (uint16_t)(m_last->data_len + len);
1010 m->pkt_len = (m->pkt_len + len);
1011 return (char*) tail;
1015 * Remove len bytes at the beginning of an mbuf.
1017 * Returns a pointer to the start address of the new data area. If the
1018 * length is greater than the length of the first segment, then the
1019 * function will fail and return NULL, without modifying the mbuf.
1024 * The amount of data to remove (in bytes).
1026 * A pointer to the new start of the data.
1028 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
1030 __rte_mbuf_sanity_check(m, 1);
1032 if (unlikely(len > m->data_len))
1035 m->data_len = (uint16_t)(m->data_len - len);
1037 m->pkt_len = (m->pkt_len - len);
1038 return (char *)m->buf_addr + m->data_off;
1042 * Remove len bytes of data at the end of the mbuf.
1044 * If the length is greater than the length of the last segment, the
1045 * function will fail and return -1 without modifying the mbuf.
1050 * The amount of data to remove (in bytes).
1055 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
1057 struct rte_mbuf *m_last;
1059 __rte_mbuf_sanity_check(m, 1);
1061 m_last = rte_pktmbuf_lastseg(m);
1062 if (unlikely(len > m_last->data_len))
1065 m_last->data_len = (uint16_t)(m_last->data_len - len);
1066 m->pkt_len = (m->pkt_len - len);
1071 * Test if mbuf data is contiguous.
1076 * - 1, if all data is contiguous (one segment).
1077 * - 0, if there is several segments.
1079 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
1081 __rte_mbuf_sanity_check(m, 1);
1082 return !!(m->nb_segs == 1);
1086 * Dump an mbuf structure to the console.
1088 * Dump all fields for the given packet mbuf and all its associated
1089 * segments (in the case of a chained buffer).
1092 * A pointer to a file for output
1096 * If dump_len != 0, also dump the "dump_len" first data bytes of
1099 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1105 #endif /* _RTE_MBUF_H_ */