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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. */
352 uint16_t mbuf_priv_size; /**< Size of private area in each mbuf. */
355 #ifdef RTE_LIBRTE_MBUF_DEBUG
357 /** check mbuf type in debug mode */
358 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
360 /** check mbuf type in debug mode if mbuf pointer is not null */
361 #define __rte_mbuf_sanity_check_raw(m, is_h) do { \
363 rte_mbuf_sanity_check(m, is_h); \
366 /** MBUF asserts in debug mode */
367 #define RTE_MBUF_ASSERT(exp) \
369 rte_panic("line%d\tassert \"" #exp "\" failed\n", __LINE__); \
372 #else /* RTE_LIBRTE_MBUF_DEBUG */
374 /** check mbuf type in debug mode */
375 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
377 /** check mbuf type in debug mode if mbuf pointer is not null */
378 #define __rte_mbuf_sanity_check_raw(m, is_h) do { } while (0)
380 /** MBUF asserts in debug mode */
381 #define RTE_MBUF_ASSERT(exp) do { } while (0)
383 #endif /* RTE_LIBRTE_MBUF_DEBUG */
385 #ifdef RTE_MBUF_REFCNT_ATOMIC
388 * Adds given value to an mbuf's refcnt and returns its new value.
392 * Value to add/subtract
396 static inline uint16_t
397 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
399 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
403 * Reads the value of an mbuf's refcnt.
407 * Reference count number.
409 static inline uint16_t
410 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
412 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
416 * Sets an mbuf's refcnt to a defined value.
423 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
425 rte_atomic16_set(&m->refcnt_atomic, new_value);
428 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
431 * Adds given value to an mbuf's refcnt and returns its new value.
433 static inline uint16_t
434 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
436 m->refcnt = (uint16_t)(m->refcnt + value);
441 * Reads the value of an mbuf's refcnt.
443 static inline uint16_t
444 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
450 * Sets an mbuf's refcnt to the defined value.
453 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
455 m->refcnt = new_value;
458 #endif /* RTE_MBUF_REFCNT_ATOMIC */
461 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
468 * Sanity checks on an mbuf.
470 * Check the consistency of the given mbuf. The function will cause a
471 * panic if corruption is detected.
474 * The mbuf to be checked.
476 * True if the mbuf is a packet header, false if it is a sub-segment
477 * of a packet (in this case, some fields like nb_segs are not checked)
480 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
483 * @internal Allocate a new mbuf from mempool *mp*.
484 * The use of that function is reserved for RTE internal needs.
485 * Please use rte_pktmbuf_alloc().
488 * The mempool from which mbuf is allocated.
490 * - The pointer to the new mbuf on success.
491 * - NULL if allocation failed.
493 static inline struct rte_mbuf *__rte_mbuf_raw_alloc(struct rte_mempool *mp)
497 if (rte_mempool_get(mp, &mb) < 0)
499 m = (struct rte_mbuf *)mb;
500 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
501 rte_mbuf_refcnt_set(m, 1);
506 * @internal Put mbuf back into its original mempool.
507 * The use of that function is reserved for RTE internal needs.
508 * Please use rte_pktmbuf_free().
511 * The mbuf to be freed.
513 static inline void __attribute__((always_inline))
514 __rte_mbuf_raw_free(struct rte_mbuf *m)
516 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
517 rte_mempool_put(m->pool, m);
520 /* Operations on ctrl mbuf */
523 * The control mbuf constructor.
525 * This function initializes some fields in an mbuf structure that are
526 * not modified by the user once created (mbuf type, origin pool, buffer
527 * start address, and so on). This function is given as a callback function
528 * to rte_mempool_create() at pool creation time.
531 * The mempool from which the mbuf is allocated.
533 * A pointer that can be used by the user to retrieve useful information
534 * for mbuf initialization. This pointer comes from the ``init_arg``
535 * parameter of rte_mempool_create().
537 * The mbuf to initialize.
539 * The index of the mbuf in the pool table.
541 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
542 void *m, unsigned i);
545 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
547 * This new mbuf is initialized with data pointing to the beginning of
548 * buffer, and with a length of zero.
551 * The mempool from which the mbuf is allocated.
553 * - The pointer to the new mbuf on success.
554 * - NULL if allocation failed.
556 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
559 * Free a control mbuf back into its original mempool.
562 * The control mbuf to be freed.
564 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
567 * A macro that returns the pointer to the carried data.
569 * The value that can be read or assigned.
574 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
577 * A macro that returns the length of the carried data.
579 * The value that can be read or assigned.
584 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
587 * Tests if an mbuf is a control mbuf
590 * The mbuf to be tested
592 * - True (1) if the mbuf is a control mbuf
593 * - False(0) otherwise
596 rte_is_ctrlmbuf(struct rte_mbuf *m)
598 return (!!(m->ol_flags & CTRL_MBUF_FLAG));
601 /* Operations on pkt mbuf */
604 * The packet mbuf constructor.
606 * This function initializes some fields in the mbuf structure that are
607 * not modified by the user once created (origin pool, buffer start
608 * address, and so on). This function is given as a callback function to
609 * rte_mempool_create() at pool creation time.
612 * The mempool from which mbufs originate.
614 * A pointer that can be used by the user to retrieve useful information
615 * for mbuf initialization. This pointer comes from the ``init_arg``
616 * parameter of rte_mempool_create().
618 * The mbuf to initialize.
620 * The index of the mbuf in the pool table.
622 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
623 void *m, unsigned i);
627 * A packet mbuf pool constructor.
629 * This function initializes the mempool private data in the case of a
630 * pktmbuf pool. This private data is needed by the driver. The
631 * function is given as a callback function to rte_mempool_create() at
632 * pool creation. It can be extended by the user, for example, to
633 * provide another packet size.
636 * The mempool from which mbufs originate.
638 * A pointer that can be used by the user to retrieve useful information
639 * for mbuf initialization. This pointer comes from the ``init_arg``
640 * parameter of rte_mempool_create().
642 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
645 * Create a mbuf pool.
647 * This function creates and initializes a packet mbuf pool. It is
648 * a wrapper to rte_mempool_create() with the proper packet constructor
649 * and mempool constructor.
652 * The name of the mbuf pool.
654 * The number of elements in the mbuf pool. The optimum size (in terms
655 * of memory usage) for a mempool is when n is a power of two minus one:
658 * Size of the per-core object cache. See rte_mempool_create() for
661 * Size of application private are between the rte_mbuf structure
662 * and the data buffer.
663 * @param data_room_size
664 * Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
666 * The socket identifier where the memory should be allocated. The
667 * value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
670 * The pointer to the new allocated mempool, on success. NULL on error
671 * with rte_errno set appropriately. Possible rte_errno values include:
672 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
673 * - E_RTE_SECONDARY - function was called from a secondary process instance
674 * - EINVAL - cache size provided is too large
675 * - ENOSPC - the maximum number of memzones has already been allocated
676 * - EEXIST - a memzone with the same name already exists
677 * - ENOMEM - no appropriate memory area found in which to create memzone
680 rte_pktmbuf_pool_create(const char *name, unsigned n,
681 unsigned cache_size, uint16_t priv_size, uint16_t data_room_size,
685 * Get the data room size of mbufs stored in a pktmbuf_pool
687 * The data room size is the amount of data that can be stored in a
688 * mbuf including the headroom (RTE_PKTMBUF_HEADROOM).
691 * The packet mbuf pool.
693 * The data room size of mbufs stored in this mempool.
695 static inline uint16_t
696 rte_pktmbuf_data_room_size(struct rte_mempool *mp)
698 struct rte_pktmbuf_pool_private *mbp_priv;
700 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
701 return mbp_priv->mbuf_data_room_size;
705 * Get the application private size of mbufs stored in a pktmbuf_pool
707 * The private size of mbuf is a zone located between the rte_mbuf
708 * structure and the data buffer where an application can store data
709 * associated to a packet.
712 * The packet mbuf pool.
714 * The private size of mbufs stored in this mempool.
716 static inline uint16_t
717 rte_pktmbuf_priv_size(struct rte_mempool *mp)
719 struct rte_pktmbuf_pool_private *mbp_priv;
721 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
722 return mbp_priv->mbuf_priv_size;
726 * Reset the fields of a packet mbuf to their default values.
728 * The given mbuf must have only one segment.
731 * The packet mbuf to be resetted.
733 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
744 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
745 RTE_PKTMBUF_HEADROOM : m->buf_len;
748 __rte_mbuf_sanity_check(m, 1);
752 * Allocate a new mbuf from a mempool.
754 * This new mbuf contains one segment, which has a length of 0. The pointer
755 * to data is initialized to have some bytes of headroom in the buffer
756 * (if buffer size allows).
759 * The mempool from which the mbuf is allocated.
761 * - The pointer to the new mbuf on success.
762 * - NULL if allocation failed.
764 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
767 if ((m = __rte_mbuf_raw_alloc(mp)) != NULL)
768 rte_pktmbuf_reset(m);
773 * Attach packet mbuf to another packet mbuf.
774 * After attachment we refer the mbuf we attached as 'indirect',
775 * while mbuf we attached to as 'direct'.
776 * Right now, not supported:
777 * - attachment to indirect mbuf (e.g. - md has to be direct).
778 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
779 * - mbuf we trying to attach (mi) is used by someone else
780 * e.g. it's reference counter is greater then 1.
783 * The indirect packet mbuf.
785 * The direct packet mbuf.
788 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *md)
790 RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(md) &&
791 RTE_MBUF_DIRECT(mi) &&
792 rte_mbuf_refcnt_read(mi) == 1);
794 rte_mbuf_refcnt_update(md, 1);
795 mi->buf_physaddr = md->buf_physaddr;
796 mi->buf_addr = md->buf_addr;
797 mi->buf_len = md->buf_len;
800 mi->data_off = md->data_off;
801 mi->data_len = md->data_len;
803 mi->vlan_tci = md->vlan_tci;
804 mi->tx_offload = md->tx_offload;
808 mi->pkt_len = mi->data_len;
810 mi->ol_flags = md->ol_flags | IND_ATTACHED_MBUF;
811 mi->packet_type = md->packet_type;
813 __rte_mbuf_sanity_check(mi, 1);
814 __rte_mbuf_sanity_check(md, 0);
818 * Detach an indirect packet mbuf -
819 * - restore original mbuf address and length values.
820 * - reset pktmbuf data and data_len to their default values.
821 * All other fields of the given packet mbuf will be left intact.
824 * The indirect attached packet mbuf.
827 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
829 const struct rte_mempool *mp = m->pool;
830 void *buf = RTE_MBUF_TO_BADDR(m);
831 uint32_t buf_len = mp->elt_size - sizeof(*m);
832 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + sizeof (*m);
835 m->buf_len = (uint16_t)buf_len;
837 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
838 RTE_PKTMBUF_HEADROOM : m->buf_len;
845 static inline struct rte_mbuf* __attribute__((always_inline))
846 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
848 __rte_mbuf_sanity_check(m, 0);
851 * Check to see if this is the last reference to the mbuf.
852 * Note: the double check here is deliberate. If the ref_cnt is "atomic"
853 * the call to "refcnt_update" is a very expensive operation, so we
854 * don't want to call it in the case where we know we are the holder
855 * of the last reference to this mbuf i.e. ref_cnt == 1.
856 * If however, ref_cnt != 1, it's still possible that we may still be
857 * the final decrementer of the count, so we need to check that
858 * result also, to make sure the mbuf is freed properly.
860 if (likely (rte_mbuf_refcnt_read(m) == 1) ||
861 likely (rte_mbuf_refcnt_update(m, -1) == 0)) {
863 rte_mbuf_refcnt_set(m, 0);
865 /* if this is an indirect mbuf, then
867 * - free attached mbuf segment
869 if (RTE_MBUF_INDIRECT(m)) {
870 struct rte_mbuf *md = RTE_MBUF_FROM_BADDR(m->buf_addr);
871 rte_pktmbuf_detach(m);
872 if (rte_mbuf_refcnt_update(md, -1) == 0)
873 __rte_mbuf_raw_free(md);
881 * Free a segment of a packet mbuf into its original mempool.
883 * Free an mbuf, without parsing other segments in case of chained
887 * The packet mbuf segment to be freed.
889 static inline void __attribute__((always_inline))
890 rte_pktmbuf_free_seg(struct rte_mbuf *m)
892 if (likely(NULL != (m = __rte_pktmbuf_prefree_seg(m)))) {
894 __rte_mbuf_raw_free(m);
899 * Free a packet mbuf back into its original mempool.
901 * Free an mbuf, and all its segments in case of chained buffers. Each
902 * segment is added back into its original mempool.
905 * The packet mbuf to be freed.
907 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
909 struct rte_mbuf *m_next;
911 __rte_mbuf_sanity_check(m, 1);
915 rte_pktmbuf_free_seg(m);
921 * Creates a "clone" of the given packet mbuf.
923 * Walks through all segments of the given packet mbuf, and for each of them:
924 * - Creates a new packet mbuf from the given pool.
925 * - Attaches newly created mbuf to the segment.
926 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
927 * from the original packet mbuf.
930 * The packet mbuf to be cloned.
932 * The mempool from which the "clone" mbufs are allocated.
934 * - The pointer to the new "clone" mbuf on success.
935 * - NULL if allocation fails.
937 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
938 struct rte_mempool *mp)
940 struct rte_mbuf *mc, *mi, **prev;
944 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
949 pktlen = md->pkt_len;
954 rte_pktmbuf_attach(mi, md);
957 } while ((md = md->next) != NULL &&
958 (mi = rte_pktmbuf_alloc(mp)) != NULL);
962 mc->pkt_len = pktlen;
964 /* Allocation of new indirect segment failed */
965 if (unlikely (mi == NULL)) {
966 rte_pktmbuf_free(mc);
970 __rte_mbuf_sanity_check(mc, 1);
975 * Adds given value to the refcnt of all packet mbuf segments.
977 * Walks through all segments of given packet mbuf and for each of them
978 * invokes rte_mbuf_refcnt_update().
981 * The packet mbuf whose refcnt to be updated.
983 * The value to add to the mbuf's segments refcnt.
985 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
987 __rte_mbuf_sanity_check(m, 1);
990 rte_mbuf_refcnt_update(m, v);
991 } while ((m = m->next) != NULL);
995 * Get the headroom in a packet mbuf.
1000 * The length of the headroom.
1002 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
1004 __rte_mbuf_sanity_check(m, 1);
1009 * Get the tailroom of a packet mbuf.
1014 * The length of the tailroom.
1016 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
1018 __rte_mbuf_sanity_check(m, 1);
1019 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
1024 * Get the last segment of the packet.
1029 * The last segment of the given mbuf.
1031 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
1033 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
1035 __rte_mbuf_sanity_check(m, 1);
1036 while (m2->next != NULL)
1042 * A macro that points to the start of the data in the mbuf.
1044 * The returned pointer is cast to type t. Before using this
1045 * function, the user must ensure that m_headlen(m) is large enough to
1051 * The type to cast the result into.
1053 #define rte_pktmbuf_mtod(m, t) ((t)((char *)(m)->buf_addr + (m)->data_off))
1056 * A macro that returns the length of the packet.
1058 * The value can be read or assigned.
1063 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
1066 * A macro that returns the length of the segment.
1068 * The value can be read or assigned.
1073 #define rte_pktmbuf_data_len(m) ((m)->data_len)
1076 * Prepend len bytes to an mbuf data area.
1078 * Returns a pointer to the new
1079 * data start address. If there is not enough headroom in the first
1080 * segment, the function will return NULL, without modifying the mbuf.
1085 * The amount of data to prepend (in bytes).
1087 * A pointer to the start of the newly prepended data, or
1088 * NULL if there is not enough headroom space in the first segment
1090 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
1093 __rte_mbuf_sanity_check(m, 1);
1095 if (unlikely(len > rte_pktmbuf_headroom(m)))
1099 m->data_len = (uint16_t)(m->data_len + len);
1100 m->pkt_len = (m->pkt_len + len);
1102 return (char *)m->buf_addr + m->data_off;
1106 * Append len bytes to an mbuf.
1108 * Append len bytes to an mbuf and return a pointer to the start address
1109 * of the added data. If there is not enough tailroom in the last
1110 * segment, the function will return NULL, without modifying the mbuf.
1115 * The amount of data to append (in bytes).
1117 * A pointer to the start of the newly appended data, or
1118 * NULL if there is not enough tailroom space in the last segment
1120 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
1123 struct rte_mbuf *m_last;
1125 __rte_mbuf_sanity_check(m, 1);
1127 m_last = rte_pktmbuf_lastseg(m);
1128 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
1131 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
1132 m_last->data_len = (uint16_t)(m_last->data_len + len);
1133 m->pkt_len = (m->pkt_len + len);
1134 return (char*) tail;
1138 * Remove len bytes at the beginning of an mbuf.
1140 * Returns a pointer to the start address of the new data area. If the
1141 * length is greater than the length of the first segment, then the
1142 * function will fail and return NULL, without modifying the mbuf.
1147 * The amount of data to remove (in bytes).
1149 * A pointer to the new start of the data.
1151 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
1153 __rte_mbuf_sanity_check(m, 1);
1155 if (unlikely(len > m->data_len))
1158 m->data_len = (uint16_t)(m->data_len - len);
1160 m->pkt_len = (m->pkt_len - len);
1161 return (char *)m->buf_addr + m->data_off;
1165 * Remove len bytes of data at the end of the mbuf.
1167 * If the length is greater than the length of the last segment, the
1168 * function will fail and return -1 without modifying the mbuf.
1173 * The amount of data to remove (in bytes).
1178 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
1180 struct rte_mbuf *m_last;
1182 __rte_mbuf_sanity_check(m, 1);
1184 m_last = rte_pktmbuf_lastseg(m);
1185 if (unlikely(len > m_last->data_len))
1188 m_last->data_len = (uint16_t)(m_last->data_len - len);
1189 m->pkt_len = (m->pkt_len - len);
1194 * Test if mbuf data is contiguous.
1199 * - 1, if all data is contiguous (one segment).
1200 * - 0, if there is several segments.
1202 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
1204 __rte_mbuf_sanity_check(m, 1);
1205 return !!(m->nb_segs == 1);
1209 * Dump an mbuf structure to the console.
1211 * Dump all fields for the given packet mbuf and all its associated
1212 * segments (in the case of a chained buffer).
1215 * A pointer to a file for output
1219 * If dump_len != 0, also dump the "dump_len" first data bytes of
1222 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1228 #endif /* _RTE_MBUF_H_ */