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5 * Copyright 2014 6WIND S.A.
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42 * The mbuf library provides the ability to create and destroy buffers
43 * that may be used by the RTE application to store message
44 * buffers. The message buffers are stored in a mempool, using the
45 * RTE mempool library.
47 * This library provide an API to allocate/free packet mbufs, which are
48 * used to carry network packets.
50 * To understand the concepts of packet buffers or mbufs, you
51 * should read "TCP/IP Illustrated, Volume 2: The Implementation,
52 * Addison-Wesley, 1995, ISBN 0-201-63354-X from Richard Stevens"
53 * http://www.kohala.com/start/tcpipiv2.html
57 #include <rte_mempool.h>
58 #include <rte_memory.h>
59 #include <rte_atomic.h>
60 #include <rte_prefetch.h>
61 #include <rte_branch_prediction.h>
67 /* deprecated options */
68 #pragma GCC poison RTE_MBUF_SCATTER_GATHER
69 #pragma GCC poison RTE_MBUF_REFCNT
72 * Packet Offload Features Flags. It also carry packet type information.
73 * Critical resources. Both rx/tx shared these bits. Be cautious on any change
75 * - RX flags start at bit position zero, and get added to the left of previous
77 * - The most-significant 8 bits are reserved for generic mbuf flags
78 * - TX flags therefore start at bit position 55 (i.e. 63-8), and new flags get
79 * added to the right of the previously defined flags
81 * Keep these flags synchronized with rte_get_rx_ol_flag_name() and
82 * rte_get_tx_ol_flag_name().
84 #define PKT_RX_VLAN_PKT (1ULL << 0) /**< RX packet is a 802.1q VLAN packet. */
85 #define PKT_RX_RSS_HASH (1ULL << 1) /**< RX packet with RSS hash result. */
86 #define PKT_RX_FDIR (1ULL << 2) /**< RX packet with FDIR match indicate. */
87 #define PKT_RX_L4_CKSUM_BAD (1ULL << 3) /**< L4 cksum of RX pkt. is not OK. */
88 #define PKT_RX_IP_CKSUM_BAD (1ULL << 4) /**< IP cksum of RX pkt. is not OK. */
89 #define PKT_RX_EIP_CKSUM_BAD (0ULL << 0) /**< External IP header checksum error. */
90 #define PKT_RX_OVERSIZE (0ULL << 0) /**< Num of desc of an RX pkt oversize. */
91 #define PKT_RX_HBUF_OVERFLOW (0ULL << 0) /**< Header buffer overflow. */
92 #define PKT_RX_RECIP_ERR (0ULL << 0) /**< Hardware processing error. */
93 #define PKT_RX_MAC_ERR (0ULL << 0) /**< MAC error. */
94 #define PKT_RX_IPV4_HDR (1ULL << 5) /**< RX packet with IPv4 header. */
95 #define PKT_RX_IPV4_HDR_EXT (1ULL << 6) /**< RX packet with extended IPv4 header. */
96 #define PKT_RX_IPV6_HDR (1ULL << 7) /**< RX packet with IPv6 header. */
97 #define PKT_RX_IPV6_HDR_EXT (1ULL << 8) /**< RX packet with extended IPv6 header. */
98 #define PKT_RX_IEEE1588_PTP (1ULL << 9) /**< RX IEEE1588 L2 Ethernet PT Packet. */
99 #define PKT_RX_IEEE1588_TMST (1ULL << 10) /**< RX IEEE1588 L2/L4 timestamped packet.*/
100 #define PKT_RX_TUNNEL_IPV4_HDR (1ULL << 11) /**< RX tunnel packet with IPv4 header.*/
101 #define PKT_RX_TUNNEL_IPV6_HDR (1ULL << 12) /**< RX tunnel packet with IPv6 header. */
102 #define PKT_RX_FDIR_ID (1ULL << 13) /**< FD id reported if FDIR match. */
103 #define PKT_RX_FDIR_FLX (1ULL << 14) /**< Flexible bytes reported if FDIR match. */
104 /* add new RX flags here */
106 /* add new TX flags here */
109 * TCP segmentation offload. To enable this offload feature for a
110 * packet to be transmitted on hardware supporting TSO:
111 * - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
113 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
114 * - if it's IPv4, set the PKT_TX_IP_CKSUM flag and write the IP checksum
116 * - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
117 * - calculate the pseudo header checksum without taking ip_len in account,
118 * and set it in the TCP header. Refer to rte_ipv4_phdr_cksum() and
119 * rte_ipv6_phdr_cksum() that can be used as helpers.
121 #define PKT_TX_TCP_SEG (1ULL << 50)
123 #define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
126 * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
127 * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
128 * L4 checksum offload, the user needs to:
129 * - fill l2_len and l3_len in mbuf
130 * - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
131 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
132 * - calculate the pseudo header checksum and set it in the L4 header (only
133 * for TCP or UDP). See rte_ipv4_phdr_cksum() and rte_ipv6_phdr_cksum().
134 * For SCTP, set the crc field to 0.
136 #define PKT_TX_L4_NO_CKSUM (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
137 #define PKT_TX_TCP_CKSUM (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */
138 #define PKT_TX_SCTP_CKSUM (2ULL << 52) /**< SCTP cksum of TX pkt. computed by NIC. */
139 #define PKT_TX_UDP_CKSUM (3ULL << 52) /**< UDP cksum of TX pkt. computed by NIC. */
140 #define PKT_TX_L4_MASK (3ULL << 52) /**< Mask for L4 cksum offload request. */
143 * Offload the IP checksum in the hardware. The flag PKT_TX_IPV4 should
144 * also be set by the application, although a PMD will only check
146 * - set the IP checksum field in the packet to 0
147 * - fill the mbuf offload information: l2_len, l3_len
149 #define PKT_TX_IP_CKSUM (1ULL << 54)
152 * Packet is IPv4. This flag must be set when using any offload feature
153 * (TSO, L3 or L4 checksum) to tell the NIC that the packet is an IPv4
154 * packet. If the packet is a tunneled packet, this flag is related to
157 #define PKT_TX_IPV4 (1ULL << 55)
160 * Packet is IPv6. This flag must be set when using an offload feature
161 * (TSO or L4 checksum) to tell the NIC that the packet is an IPv6
162 * packet. If the packet is a tunneled packet, this flag is related to
165 #define PKT_TX_IPV6 (1ULL << 56)
167 #define PKT_TX_VLAN_PKT (1ULL << 57) /**< TX packet is a 802.1q VLAN packet. */
170 * Offload the IP checksum of an external header in the hardware. The
171 * flag PKT_TX_OUTER_IPV4 should also be set by the application, alto ugh
172 * a PMD will only check PKT_TX_IP_CKSUM. The IP checksum field in the
173 * packet must be set to 0.
174 * - set the outer IP checksum field in the packet to 0
175 * - fill the mbuf offload information: outer_l2_len, outer_l3_len
177 #define PKT_TX_OUTER_IP_CKSUM (1ULL << 58)
180 * Packet outer header is IPv4. This flag must be set when using any
181 * outer offload feature (L3 or L4 checksum) to tell the NIC that the
182 * outer header of the tunneled packet is an IPv4 packet.
184 #define PKT_TX_OUTER_IPV4 (1ULL << 59)
187 * Packet outer header is IPv6. This flag must be set when using any
188 * outer offload feature (L4 checksum) to tell the NIC that the outer
189 * header of the tunneled packet is an IPv6 packet.
191 #define PKT_TX_OUTER_IPV6 (1ULL << 60)
193 #define IND_ATTACHED_MBUF (1ULL << 62) /**< Indirect attached mbuf */
195 /* Use final bit of flags to indicate a control mbuf */
196 #define CTRL_MBUF_FLAG (1ULL << 63) /**< Mbuf contains control data */
199 * Get the name of a RX offload flag
202 * The mask describing the flag.
204 * The name of this flag, or NULL if it's not a valid RX flag.
206 const char *rte_get_rx_ol_flag_name(uint64_t mask);
209 * Get the name of a TX offload flag
212 * The mask describing the flag. Usually only one bit must be set.
213 * Several bits can be given if they belong to the same mask.
214 * Ex: PKT_TX_L4_MASK.
216 * The name of this flag, or NULL if it's not a valid TX flag.
218 const char *rte_get_tx_ol_flag_name(uint64_t mask);
220 /* define a set of marker types that can be used to refer to set points in the
222 typedef void *MARKER[0]; /**< generic marker for a point in a structure */
223 typedef uint8_t MARKER8[0]; /**< generic marker with 1B alignment */
224 typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
225 * with a single assignment */
228 * The generic rte_mbuf, containing a packet mbuf.
233 void *buf_addr; /**< Virtual address of segment buffer. */
234 phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
236 uint16_t buf_len; /**< Length of segment buffer. */
238 /* next 6 bytes are initialised on RX descriptor rearm */
243 * 16-bit Reference counter.
244 * It should only be accessed using the following functions:
245 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
246 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
247 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
251 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
252 uint16_t refcnt; /**< Non-atomically accessed refcnt */
254 uint8_t nb_segs; /**< Number of segments. */
255 uint8_t port; /**< Input port. */
257 uint64_t ol_flags; /**< Offload features. */
259 /* remaining bytes are set on RX when pulling packet from descriptor */
260 MARKER rx_descriptor_fields1;
263 * The packet type, which is used to indicate ordinary packet and also
264 * tunneled packet format, i.e. each number is represented a type of
267 uint16_t packet_type;
269 uint16_t data_len; /**< Amount of data in segment buffer. */
270 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
271 uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order) */
274 uint32_t rss; /**< RSS hash result if RSS enabled */
282 /**< Second 4 flexible bytes */
285 /**< First 4 flexible bytes or FD ID, dependent on
286 PKT_RX_FDIR_* flag in ol_flags. */
287 } fdir; /**< Filter identifier if FDIR enabled */
288 uint32_t sched; /**< Hierarchical scheduler */
289 uint32_t usr; /**< User defined tags. See rte_distributor_process() */
290 } hash; /**< hash information */
292 uint32_t seqn; /**< Sequence number. See also rte_reorder_insert() */
294 /* second cache line - fields only used in slow path or on TX */
295 MARKER cacheline1 __rte_cache_aligned;
298 void *userdata; /**< Can be used for external metadata */
299 uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
302 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
303 struct rte_mbuf *next; /**< Next segment of scattered packet. */
305 /* fields to support TX offloads */
307 uint64_t tx_offload; /**< combined for easy fetch */
309 uint64_t l2_len:7; /**< L2 (MAC) Header Length. */
310 uint64_t l3_len:9; /**< L3 (IP) Header Length. */
311 uint64_t l4_len:8; /**< L4 (TCP/UDP) Header Length. */
312 uint64_t tso_segsz:16; /**< TCP TSO segment size */
314 /* fields for TX offloading of tunnels */
315 uint64_t outer_l3_len:9; /**< Outer L3 (IP) Hdr Length. */
316 uint64_t outer_l2_len:7; /**< Outer L2 (MAC) Hdr Length. */
318 /* uint64_t unused:8; */
321 } __rte_cache_aligned;
324 * Given the buf_addr returns the pointer to corresponding mbuf.
326 #define RTE_MBUF_FROM_BADDR(ba) (((struct rte_mbuf *)(ba)) - 1)
329 * Given the pointer to mbuf returns an address where it's buf_addr
332 #define RTE_MBUF_TO_BADDR(mb) (((struct rte_mbuf *)(mb)) + 1)
335 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
337 #define RTE_MBUF_INDIRECT(mb) ((mb)->ol_flags & IND_ATTACHED_MBUF)
340 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
342 #define RTE_MBUF_DIRECT(mb) (!RTE_MBUF_INDIRECT(mb))
345 * Private data in case of pktmbuf pool.
347 * A structure that contains some pktmbuf_pool-specific data that are
348 * appended after the mempool structure (in private data).
350 struct rte_pktmbuf_pool_private {
351 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf.*/
354 #ifdef RTE_LIBRTE_MBUF_DEBUG
356 /** check mbuf type in debug mode */
357 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
359 /** check mbuf type in debug mode if mbuf pointer is not null */
360 #define __rte_mbuf_sanity_check_raw(m, is_h) do { \
362 rte_mbuf_sanity_check(m, is_h); \
365 /** MBUF asserts in debug mode */
366 #define RTE_MBUF_ASSERT(exp) \
368 rte_panic("line%d\tassert \"" #exp "\" failed\n", __LINE__); \
371 #else /* RTE_LIBRTE_MBUF_DEBUG */
373 /** check mbuf type in debug mode */
374 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
376 /** check mbuf type in debug mode if mbuf pointer is not null */
377 #define __rte_mbuf_sanity_check_raw(m, is_h) do { } while (0)
379 /** MBUF asserts in debug mode */
380 #define RTE_MBUF_ASSERT(exp) do { } while (0)
382 #endif /* RTE_LIBRTE_MBUF_DEBUG */
384 #ifdef RTE_MBUF_REFCNT_ATOMIC
387 * Adds given value to an mbuf's refcnt and returns its new value.
391 * Value to add/subtract
395 static inline uint16_t
396 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
398 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
402 * Reads the value of an mbuf's refcnt.
406 * Reference count number.
408 static inline uint16_t
409 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
411 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
415 * Sets an mbuf's refcnt to a defined value.
422 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
424 rte_atomic16_set(&m->refcnt_atomic, new_value);
427 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
430 * Adds given value to an mbuf's refcnt and returns its new value.
432 static inline uint16_t
433 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
435 m->refcnt = (uint16_t)(m->refcnt + value);
440 * Reads the value of an mbuf's refcnt.
442 static inline uint16_t
443 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
449 * Sets an mbuf's refcnt to the defined value.
452 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
454 m->refcnt = new_value;
457 #endif /* RTE_MBUF_REFCNT_ATOMIC */
460 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
467 * Sanity checks on an mbuf.
469 * Check the consistency of the given mbuf. The function will cause a
470 * panic if corruption is detected.
473 * The mbuf to be checked.
475 * True if the mbuf is a packet header, false if it is a sub-segment
476 * of a packet (in this case, some fields like nb_segs are not checked)
479 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
482 * @internal Allocate a new mbuf from mempool *mp*.
483 * The use of that function is reserved for RTE internal needs.
484 * Please use rte_pktmbuf_alloc().
487 * The mempool from which mbuf is allocated.
489 * - The pointer to the new mbuf on success.
490 * - NULL if allocation failed.
492 static inline struct rte_mbuf *__rte_mbuf_raw_alloc(struct rte_mempool *mp)
496 if (rte_mempool_get(mp, &mb) < 0)
498 m = (struct rte_mbuf *)mb;
499 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
500 rte_mbuf_refcnt_set(m, 1);
505 * @internal Put mbuf back into its original mempool.
506 * The use of that function is reserved for RTE internal needs.
507 * Please use rte_pktmbuf_free().
510 * The mbuf to be freed.
512 static inline void __attribute__((always_inline))
513 __rte_mbuf_raw_free(struct rte_mbuf *m)
515 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
516 rte_mempool_put(m->pool, m);
519 /* Operations on ctrl mbuf */
522 * The control mbuf constructor.
524 * This function initializes some fields in an mbuf structure that are
525 * not modified by the user once created (mbuf type, origin pool, buffer
526 * start address, and so on). This function is given as a callback function
527 * to rte_mempool_create() at pool creation time.
530 * The mempool from which the mbuf is allocated.
532 * A pointer that can be used by the user to retrieve useful information
533 * for mbuf initialization. This pointer comes from the ``init_arg``
534 * parameter of rte_mempool_create().
536 * The mbuf to initialize.
538 * The index of the mbuf in the pool table.
540 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
541 void *m, unsigned i);
544 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
546 * This new mbuf is initialized with data pointing to the beginning of
547 * buffer, and with a length of zero.
550 * The mempool from which the mbuf is allocated.
552 * - The pointer to the new mbuf on success.
553 * - NULL if allocation failed.
555 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
558 * Free a control mbuf back into its original mempool.
561 * The control mbuf to be freed.
563 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
566 * A macro that returns the pointer to the carried data.
568 * The value that can be read or assigned.
573 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
576 * A macro that returns the length of the carried data.
578 * The value that can be read or assigned.
583 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
586 * Tests if an mbuf is a control mbuf
589 * The mbuf to be tested
591 * - True (1) if the mbuf is a control mbuf
592 * - False(0) otherwise
595 rte_is_ctrlmbuf(struct rte_mbuf *m)
597 return (!!(m->ol_flags & CTRL_MBUF_FLAG));
600 /* Operations on pkt mbuf */
603 * The packet mbuf constructor.
605 * This function initializes some fields in the mbuf structure that are
606 * not modified by the user once created (origin pool, buffer start
607 * address, and so on). This function is given as a callback function to
608 * rte_mempool_create() at pool creation time.
611 * The mempool from which mbufs originate.
613 * A pointer that can be used by the user to retrieve useful information
614 * for mbuf initialization. This pointer comes from the ``init_arg``
615 * parameter of rte_mempool_create().
617 * The mbuf to initialize.
619 * The index of the mbuf in the pool table.
621 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
622 void *m, unsigned i);
626 * A packet mbuf pool constructor.
628 * This function initializes the mempool private data in the case of a
629 * pktmbuf pool. This private data is needed by the driver. The
630 * function is given as a callback function to rte_mempool_create() at
631 * pool creation. It can be extended by the user, for example, to
632 * provide another packet size.
635 * The mempool from which mbufs originate.
637 * A pointer that can be used by the user to retrieve useful information
638 * for mbuf initialization. This pointer comes from the ``init_arg``
639 * parameter of rte_mempool_create().
641 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
644 * Reset the fields of a packet mbuf to their default values.
646 * The given mbuf must have only one segment.
649 * The packet mbuf to be resetted.
651 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
662 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
663 RTE_PKTMBUF_HEADROOM : m->buf_len;
666 __rte_mbuf_sanity_check(m, 1);
670 * Allocate a new mbuf from a mempool.
672 * This new mbuf contains one segment, which has a length of 0. The pointer
673 * to data is initialized to have some bytes of headroom in the buffer
674 * (if buffer size allows).
677 * The mempool from which the mbuf is allocated.
679 * - The pointer to the new mbuf on success.
680 * - NULL if allocation failed.
682 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
685 if ((m = __rte_mbuf_raw_alloc(mp)) != NULL)
686 rte_pktmbuf_reset(m);
691 * Attach packet mbuf to another packet mbuf.
692 * After attachment we refer the mbuf we attached as 'indirect',
693 * while mbuf we attached to as 'direct'.
694 * Right now, not supported:
695 * - attachment to indirect mbuf (e.g. - md has to be direct).
696 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
697 * - mbuf we trying to attach (mi) is used by someone else
698 * e.g. it's reference counter is greater then 1.
701 * The indirect packet mbuf.
703 * The direct packet mbuf.
706 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *md)
708 RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(md) &&
709 RTE_MBUF_DIRECT(mi) &&
710 rte_mbuf_refcnt_read(mi) == 1);
712 rte_mbuf_refcnt_update(md, 1);
713 mi->buf_physaddr = md->buf_physaddr;
714 mi->buf_addr = md->buf_addr;
715 mi->buf_len = md->buf_len;
718 mi->data_off = md->data_off;
719 mi->data_len = md->data_len;
721 mi->vlan_tci = md->vlan_tci;
722 mi->tx_offload = md->tx_offload;
726 mi->pkt_len = mi->data_len;
728 mi->ol_flags = md->ol_flags | IND_ATTACHED_MBUF;
729 mi->packet_type = md->packet_type;
731 __rte_mbuf_sanity_check(mi, 1);
732 __rte_mbuf_sanity_check(md, 0);
736 * Detach an indirect packet mbuf -
737 * - restore original mbuf address and length values.
738 * - reset pktmbuf data and data_len to their default values.
739 * All other fields of the given packet mbuf will be left intact.
742 * The indirect attached packet mbuf.
745 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
747 const struct rte_mempool *mp = m->pool;
748 void *buf = RTE_MBUF_TO_BADDR(m);
749 uint32_t buf_len = mp->elt_size - sizeof(*m);
750 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + sizeof (*m);
753 m->buf_len = (uint16_t)buf_len;
755 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
756 RTE_PKTMBUF_HEADROOM : m->buf_len;
763 static inline struct rte_mbuf* __attribute__((always_inline))
764 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
766 __rte_mbuf_sanity_check(m, 0);
769 * Check to see if this is the last reference to the mbuf.
770 * Note: the double check here is deliberate. If the ref_cnt is "atomic"
771 * the call to "refcnt_update" is a very expensive operation, so we
772 * don't want to call it in the case where we know we are the holder
773 * of the last reference to this mbuf i.e. ref_cnt == 1.
774 * If however, ref_cnt != 1, it's still possible that we may still be
775 * the final decrementer of the count, so we need to check that
776 * result also, to make sure the mbuf is freed properly.
778 if (likely (rte_mbuf_refcnt_read(m) == 1) ||
779 likely (rte_mbuf_refcnt_update(m, -1) == 0)) {
781 rte_mbuf_refcnt_set(m, 0);
783 /* if this is an indirect mbuf, then
785 * - free attached mbuf segment
787 if (RTE_MBUF_INDIRECT(m)) {
788 struct rte_mbuf *md = RTE_MBUF_FROM_BADDR(m->buf_addr);
789 rte_pktmbuf_detach(m);
790 if (rte_mbuf_refcnt_update(md, -1) == 0)
791 __rte_mbuf_raw_free(md);
799 * Free a segment of a packet mbuf into its original mempool.
801 * Free an mbuf, without parsing other segments in case of chained
805 * The packet mbuf segment to be freed.
807 static inline void __attribute__((always_inline))
808 rte_pktmbuf_free_seg(struct rte_mbuf *m)
810 if (likely(NULL != (m = __rte_pktmbuf_prefree_seg(m)))) {
812 __rte_mbuf_raw_free(m);
817 * Free a packet mbuf back into its original mempool.
819 * Free an mbuf, and all its segments in case of chained buffers. Each
820 * segment is added back into its original mempool.
823 * The packet mbuf to be freed.
825 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
827 struct rte_mbuf *m_next;
829 __rte_mbuf_sanity_check(m, 1);
833 rte_pktmbuf_free_seg(m);
839 * Creates a "clone" of the given packet mbuf.
841 * Walks through all segments of the given packet mbuf, and for each of them:
842 * - Creates a new packet mbuf from the given pool.
843 * - Attaches newly created mbuf to the segment.
844 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
845 * from the original packet mbuf.
848 * The packet mbuf to be cloned.
850 * The mempool from which the "clone" mbufs are allocated.
852 * - The pointer to the new "clone" mbuf on success.
853 * - NULL if allocation fails.
855 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
856 struct rte_mempool *mp)
858 struct rte_mbuf *mc, *mi, **prev;
862 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
867 pktlen = md->pkt_len;
872 rte_pktmbuf_attach(mi, md);
875 } while ((md = md->next) != NULL &&
876 (mi = rte_pktmbuf_alloc(mp)) != NULL);
880 mc->pkt_len = pktlen;
882 /* Allocation of new indirect segment failed */
883 if (unlikely (mi == NULL)) {
884 rte_pktmbuf_free(mc);
888 __rte_mbuf_sanity_check(mc, 1);
893 * Adds given value to the refcnt of all packet mbuf segments.
895 * Walks through all segments of given packet mbuf and for each of them
896 * invokes rte_mbuf_refcnt_update().
899 * The packet mbuf whose refcnt to be updated.
901 * The value to add to the mbuf's segments refcnt.
903 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
905 __rte_mbuf_sanity_check(m, 1);
908 rte_mbuf_refcnt_update(m, v);
909 } while ((m = m->next) != NULL);
913 * Get the headroom in a packet mbuf.
918 * The length of the headroom.
920 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
922 __rte_mbuf_sanity_check(m, 1);
927 * Get the tailroom of a packet mbuf.
932 * The length of the tailroom.
934 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
936 __rte_mbuf_sanity_check(m, 1);
937 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
942 * Get the last segment of the packet.
947 * The last segment of the given mbuf.
949 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
951 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
953 __rte_mbuf_sanity_check(m, 1);
954 while (m2->next != NULL)
960 * A macro that points to the start of the data in the mbuf.
962 * The returned pointer is cast to type t. Before using this
963 * function, the user must ensure that m_headlen(m) is large enough to
969 * The type to cast the result into.
971 #define rte_pktmbuf_mtod(m, t) ((t)((char *)(m)->buf_addr + (m)->data_off))
974 * A macro that returns the length of the packet.
976 * The value can be read or assigned.
981 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
984 * A macro that returns the length of the segment.
986 * The value can be read or assigned.
991 #define rte_pktmbuf_data_len(m) ((m)->data_len)
994 * Prepend len bytes to an mbuf data area.
996 * Returns a pointer to the new
997 * data start address. If there is not enough headroom in the first
998 * segment, the function will return NULL, without modifying the mbuf.
1003 * The amount of data to prepend (in bytes).
1005 * A pointer to the start of the newly prepended data, or
1006 * NULL if there is not enough headroom space in the first segment
1008 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
1011 __rte_mbuf_sanity_check(m, 1);
1013 if (unlikely(len > rte_pktmbuf_headroom(m)))
1017 m->data_len = (uint16_t)(m->data_len + len);
1018 m->pkt_len = (m->pkt_len + len);
1020 return (char *)m->buf_addr + m->data_off;
1024 * Append len bytes to an mbuf.
1026 * Append len bytes to an mbuf and return a pointer to the start address
1027 * of the added data. If there is not enough tailroom in the last
1028 * segment, the function will return NULL, without modifying the mbuf.
1033 * The amount of data to append (in bytes).
1035 * A pointer to the start of the newly appended data, or
1036 * NULL if there is not enough tailroom space in the last segment
1038 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
1041 struct rte_mbuf *m_last;
1043 __rte_mbuf_sanity_check(m, 1);
1045 m_last = rte_pktmbuf_lastseg(m);
1046 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
1049 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
1050 m_last->data_len = (uint16_t)(m_last->data_len + len);
1051 m->pkt_len = (m->pkt_len + len);
1052 return (char*) tail;
1056 * Remove len bytes at the beginning of an mbuf.
1058 * Returns a pointer to the start address of the new data area. If the
1059 * length is greater than the length of the first segment, then the
1060 * function will fail and return NULL, without modifying the mbuf.
1065 * The amount of data to remove (in bytes).
1067 * A pointer to the new start of the data.
1069 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
1071 __rte_mbuf_sanity_check(m, 1);
1073 if (unlikely(len > m->data_len))
1076 m->data_len = (uint16_t)(m->data_len - len);
1078 m->pkt_len = (m->pkt_len - len);
1079 return (char *)m->buf_addr + m->data_off;
1083 * Remove len bytes of data at the end of the mbuf.
1085 * If the length is greater than the length of the last segment, the
1086 * function will fail and return -1 without modifying the mbuf.
1091 * The amount of data to remove (in bytes).
1096 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
1098 struct rte_mbuf *m_last;
1100 __rte_mbuf_sanity_check(m, 1);
1102 m_last = rte_pktmbuf_lastseg(m);
1103 if (unlikely(len > m_last->data_len))
1106 m_last->data_len = (uint16_t)(m_last->data_len - len);
1107 m->pkt_len = (m->pkt_len - len);
1112 * Test if mbuf data is contiguous.
1117 * - 1, if all data is contiguous (one segment).
1118 * - 0, if there is several segments.
1120 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
1122 __rte_mbuf_sanity_check(m, 1);
1123 return !!(m->nb_segs == 1);
1127 * Dump an mbuf structure to the console.
1129 * Dump all fields for the given packet mbuf and all its associated
1130 * segments (in the case of a chained buffer).
1133 * A pointer to a file for output
1137 * If dump_len != 0, also dump the "dump_len" first data bytes of
1140 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1146 #endif /* _RTE_MBUF_H_ */