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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 * The preferred way to create a mbuf pool is to use
48 * rte_pktmbuf_pool_create(). However, in some situations, an
49 * application may want to have more control (ex: populate the pool with
50 * specific memory), in this case it is possible to use functions from
51 * rte_mempool. See how rte_pktmbuf_pool_create() is implemented for
54 * This library provides an API to allocate/free packet mbufs, which are
55 * used to carry network packets.
57 * To understand the concepts of packet buffers or mbufs, you
58 * should read "TCP/IP Illustrated, Volume 2: The Implementation,
59 * Addison-Wesley, 1995, ISBN 0-201-63354-X from Richard Stevens"
60 * http://www.kohala.com/start/tcpipiv2.html
64 #include <rte_common.h>
65 #include <rte_mempool.h>
66 #include <rte_memory.h>
67 #include <rte_atomic.h>
68 #include <rte_prefetch.h>
69 #include <rte_branch_prediction.h>
70 #include <rte_mbuf_ptype.h>
77 * Packet Offload Features Flags. It also carry packet type information.
78 * Critical resources. Both rx/tx shared these bits. Be cautious on any change
80 * - RX flags start at bit position zero, and get added to the left of previous
82 * - The most-significant 3 bits are reserved for generic mbuf flags
83 * - TX flags therefore start at bit position 60 (i.e. 63-3), and new flags get
84 * added to the right of the previously defined flags i.e. they should count
85 * downwards, not upwards.
87 * Keep these flags synchronized with rte_get_rx_ol_flag_name() and
88 * rte_get_tx_ol_flag_name().
92 * RX packet is a 802.1q VLAN packet. This flag was set by PMDs when
93 * the packet is recognized as a VLAN, but the behavior between PMDs
94 * was not the same. This flag is kept for some time to avoid breaking
95 * applications and should be replaced by PKT_RX_VLAN_STRIPPED.
97 #define PKT_RX_VLAN_PKT (1ULL << 0)
99 #define PKT_RX_RSS_HASH (1ULL << 1) /**< RX packet with RSS hash result. */
100 #define PKT_RX_FDIR (1ULL << 2) /**< RX packet with FDIR match indicate. */
104 * Checking this flag alone is deprecated: check the 2 bits of
105 * PKT_RX_L4_CKSUM_MASK.
106 * This flag was set when the L4 checksum of a packet was detected as
107 * wrong by the hardware.
109 #define PKT_RX_L4_CKSUM_BAD (1ULL << 3)
113 * Checking this flag alone is deprecated: check the 2 bits of
114 * PKT_RX_IP_CKSUM_MASK.
115 * This flag was set when the IP checksum of a packet was detected as
116 * wrong by the hardware.
118 #define PKT_RX_IP_CKSUM_BAD (1ULL << 4)
120 #define PKT_RX_EIP_CKSUM_BAD (1ULL << 5) /**< External IP header checksum error. */
123 * A vlan has been stripped by the hardware and its tci is saved in
124 * mbuf->vlan_tci. This can only happen if vlan stripping is enabled
125 * in the RX configuration of the PMD.
127 #define PKT_RX_VLAN_STRIPPED (1ULL << 6)
130 * Mask of bits used to determine the status of RX IP checksum.
131 * - PKT_RX_IP_CKSUM_UNKNOWN: no information about the RX IP checksum
132 * - PKT_RX_IP_CKSUM_BAD: the IP checksum in the packet is wrong
133 * - PKT_RX_IP_CKSUM_GOOD: the IP checksum in the packet is valid
134 * - PKT_RX_IP_CKSUM_NONE: the IP checksum is not correct in the packet
135 * data, but the integrity of the IP header is verified.
137 #define PKT_RX_IP_CKSUM_MASK ((1ULL << 4) | (1ULL << 7))
139 #define PKT_RX_IP_CKSUM_UNKNOWN 0
140 #define PKT_RX_IP_CKSUM_BAD (1ULL << 4)
141 #define PKT_RX_IP_CKSUM_GOOD (1ULL << 7)
142 #define PKT_RX_IP_CKSUM_NONE ((1ULL << 4) | (1ULL << 7))
145 * Mask of bits used to determine the status of RX L4 checksum.
146 * - PKT_RX_L4_CKSUM_UNKNOWN: no information about the RX L4 checksum
147 * - PKT_RX_L4_CKSUM_BAD: the L4 checksum in the packet is wrong
148 * - PKT_RX_L4_CKSUM_GOOD: the L4 checksum in the packet is valid
149 * - PKT_RX_L4_CKSUM_NONE: the L4 checksum is not correct in the packet
150 * data, but the integrity of the L4 data is verified.
152 #define PKT_RX_L4_CKSUM_MASK ((1ULL << 3) | (1ULL << 8))
154 #define PKT_RX_L4_CKSUM_UNKNOWN 0
155 #define PKT_RX_L4_CKSUM_BAD (1ULL << 3)
156 #define PKT_RX_L4_CKSUM_GOOD (1ULL << 8)
157 #define PKT_RX_L4_CKSUM_NONE ((1ULL << 3) | (1ULL << 8))
159 #define PKT_RX_IEEE1588_PTP (1ULL << 9) /**< RX IEEE1588 L2 Ethernet PT Packet. */
160 #define PKT_RX_IEEE1588_TMST (1ULL << 10) /**< RX IEEE1588 L2/L4 timestamped packet.*/
161 #define PKT_RX_FDIR_ID (1ULL << 13) /**< FD id reported if FDIR match. */
162 #define PKT_RX_FDIR_FLX (1ULL << 14) /**< Flexible bytes reported if FDIR match. */
165 * The 2 vlans have been stripped by the hardware and their tci are
166 * saved in mbuf->vlan_tci (inner) and mbuf->vlan_tci_outer (outer).
167 * This can only happen if vlan stripping is enabled in the RX
168 * configuration of the PMD. If this flag is set, PKT_RX_VLAN_STRIPPED
171 #define PKT_RX_QINQ_STRIPPED (1ULL << 15)
175 * RX packet with double VLAN stripped.
176 * This flag is replaced by PKT_RX_QINQ_STRIPPED.
178 #define PKT_RX_QINQ_PKT PKT_RX_QINQ_STRIPPED
181 * When packets are coalesced by a hardware or virtual driver, this flag
182 * can be set in the RX mbuf, meaning that the m->tso_segsz field is
183 * valid and is set to the segment size of original packets.
185 #define PKT_RX_LRO (1ULL << 16)
188 * Indicate that the timestamp field in the mbuf is valid.
190 #define PKT_RX_TIMESTAMP (1ULL << 17)
192 /* add new RX flags here */
194 /* add new TX flags here */
197 * Offload the MACsec. This flag must be set by the application to enable
198 * this offload feature for a packet to be transmitted.
200 #define PKT_TX_MACSEC (1ULL << 44)
203 * Bits 45:48 used for the tunnel type.
204 * When doing Tx offload like TSO or checksum, the HW needs to configure the
205 * tunnel type into the HW descriptors.
207 #define PKT_TX_TUNNEL_VXLAN (0x1ULL << 45)
208 #define PKT_TX_TUNNEL_GRE (0x2ULL << 45)
209 #define PKT_TX_TUNNEL_IPIP (0x3ULL << 45)
210 #define PKT_TX_TUNNEL_GENEVE (0x4ULL << 45)
211 /* add new TX TUNNEL type here */
212 #define PKT_TX_TUNNEL_MASK (0xFULL << 45)
215 * Second VLAN insertion (QinQ) flag.
217 #define PKT_TX_QINQ_PKT (1ULL << 49) /**< TX packet with double VLAN inserted. */
220 * TCP segmentation offload. To enable this offload feature for a
221 * packet to be transmitted on hardware supporting TSO:
222 * - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
224 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
225 * - if it's IPv4, set the PKT_TX_IP_CKSUM flag and write the IP checksum
227 * - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
228 * - calculate the pseudo header checksum without taking ip_len in account,
229 * and set it in the TCP header. Refer to rte_ipv4_phdr_cksum() and
230 * rte_ipv6_phdr_cksum() that can be used as helpers.
232 #define PKT_TX_TCP_SEG (1ULL << 50)
234 #define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
237 * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
238 * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
239 * L4 checksum offload, the user needs to:
240 * - fill l2_len and l3_len in mbuf
241 * - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
242 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
243 * - calculate the pseudo header checksum and set it in the L4 header (only
244 * for TCP or UDP). See rte_ipv4_phdr_cksum() and rte_ipv6_phdr_cksum().
245 * For SCTP, set the crc field to 0.
247 #define PKT_TX_L4_NO_CKSUM (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
248 #define PKT_TX_TCP_CKSUM (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */
249 #define PKT_TX_SCTP_CKSUM (2ULL << 52) /**< SCTP cksum of TX pkt. computed by NIC. */
250 #define PKT_TX_UDP_CKSUM (3ULL << 52) /**< UDP cksum of TX pkt. computed by NIC. */
251 #define PKT_TX_L4_MASK (3ULL << 52) /**< Mask for L4 cksum offload request. */
254 * Offload the IP checksum in the hardware. The flag PKT_TX_IPV4 should
255 * also be set by the application, although a PMD will only check
257 * - set the IP checksum field in the packet to 0
258 * - fill the mbuf offload information: l2_len, l3_len
260 #define PKT_TX_IP_CKSUM (1ULL << 54)
263 * Packet is IPv4. This flag must be set when using any offload feature
264 * (TSO, L3 or L4 checksum) to tell the NIC that the packet is an IPv4
265 * packet. If the packet is a tunneled packet, this flag is related to
268 #define PKT_TX_IPV4 (1ULL << 55)
271 * Packet is IPv6. This flag must be set when using an offload feature
272 * (TSO or L4 checksum) to tell the NIC that the packet is an IPv6
273 * packet. If the packet is a tunneled packet, this flag is related to
276 #define PKT_TX_IPV6 (1ULL << 56)
278 #define PKT_TX_VLAN_PKT (1ULL << 57) /**< TX packet is a 802.1q VLAN packet. */
281 * Offload the IP checksum of an external header in the hardware. The
282 * flag PKT_TX_OUTER_IPV4 should also be set by the application, alto ugh
283 * a PMD will only check PKT_TX_IP_CKSUM. The IP checksum field in the
284 * packet must be set to 0.
285 * - set the outer IP checksum field in the packet to 0
286 * - fill the mbuf offload information: outer_l2_len, outer_l3_len
288 #define PKT_TX_OUTER_IP_CKSUM (1ULL << 58)
291 * Packet outer header is IPv4. This flag must be set when using any
292 * outer offload feature (L3 or L4 checksum) to tell the NIC that the
293 * outer header of the tunneled packet is an IPv4 packet.
295 #define PKT_TX_OUTER_IPV4 (1ULL << 59)
298 * Packet outer header is IPv6. This flag must be set when using any
299 * outer offload feature (L4 checksum) to tell the NIC that the outer
300 * header of the tunneled packet is an IPv6 packet.
302 #define PKT_TX_OUTER_IPV6 (1ULL << 60)
305 * Bitmask of all supported packet Tx offload features flags,
306 * which can be set for packet.
308 #define PKT_TX_OFFLOAD_MASK ( \
311 PKT_TX_OUTER_IP_CKSUM | \
313 PKT_TX_IEEE1588_TMST | \
316 PKT_TX_TUNNEL_MASK | \
319 #define __RESERVED (1ULL << 61) /**< reserved for future mbuf use */
321 #define IND_ATTACHED_MBUF (1ULL << 62) /**< Indirect attached mbuf */
323 /* Use final bit of flags to indicate a control mbuf */
324 #define CTRL_MBUF_FLAG (1ULL << 63) /**< Mbuf contains control data */
326 /** Alignment constraint of mbuf private area. */
327 #define RTE_MBUF_PRIV_ALIGN 8
330 * Get the name of a RX offload flag
333 * The mask describing the flag.
335 * The name of this flag, or NULL if it's not a valid RX flag.
337 const char *rte_get_rx_ol_flag_name(uint64_t mask);
340 * Dump the list of RX offload flags in a buffer
343 * The mask describing the RX flags.
347 * The length of the buffer.
349 * 0 on success, (-1) on error.
351 int rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
354 * Get the name of a TX offload flag
357 * The mask describing the flag. Usually only one bit must be set.
358 * Several bits can be given if they belong to the same mask.
359 * Ex: PKT_TX_L4_MASK.
361 * The name of this flag, or NULL if it's not a valid TX flag.
363 const char *rte_get_tx_ol_flag_name(uint64_t mask);
366 * Dump the list of TX offload flags in a buffer
369 * The mask describing the TX flags.
373 * The length of the buffer.
375 * 0 on success, (-1) on error.
377 int rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
380 * Some NICs need at least 2KB buffer to RX standard Ethernet frame without
381 * splitting it into multiple segments.
382 * So, for mbufs that planned to be involved into RX/TX, the recommended
383 * minimal buffer length is 2KB + RTE_PKTMBUF_HEADROOM.
385 #define RTE_MBUF_DEFAULT_DATAROOM 2048
386 #define RTE_MBUF_DEFAULT_BUF_SIZE \
387 (RTE_MBUF_DEFAULT_DATAROOM + RTE_PKTMBUF_HEADROOM)
389 /* define a set of marker types that can be used to refer to set points in the
392 typedef void *MARKER[0]; /**< generic marker for a point in a structure */
394 typedef uint8_t MARKER8[0]; /**< generic marker with 1B alignment */
396 typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
397 * with a single assignment */
400 * The generic rte_mbuf, containing a packet mbuf.
405 void *buf_addr; /**< Virtual address of segment buffer. */
407 * Physical address of segment buffer.
408 * Force alignment to 8-bytes, so as to ensure we have the exact
409 * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes
410 * working on vector drivers easier.
412 phys_addr_t buf_physaddr __rte_aligned(sizeof(phys_addr_t));
414 /* next 8 bytes are initialised on RX descriptor rearm */
419 * Reference counter. Its size should at least equal to the size
420 * of port field (16 bits), to support zero-copy broadcast.
421 * It should only be accessed using the following functions:
422 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
423 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
424 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
429 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
430 uint16_t refcnt; /**< Non-atomically accessed refcnt */
432 uint16_t nb_segs; /**< Number of segments. */
434 /** Input port (16 bits to support more than 256 virtual ports). */
437 uint64_t ol_flags; /**< Offload features. */
439 /* remaining bytes are set on RX when pulling packet from descriptor */
440 MARKER rx_descriptor_fields1;
443 * The packet type, which is the combination of outer/inner L2, L3, L4
444 * and tunnel types. The packet_type is about data really present in the
445 * mbuf. Example: if vlan stripping is enabled, a received vlan packet
446 * would have RTE_PTYPE_L2_ETHER and not RTE_PTYPE_L2_VLAN because the
447 * vlan is stripped from the data.
451 uint32_t packet_type; /**< L2/L3/L4 and tunnel information. */
453 uint32_t l2_type:4; /**< (Outer) L2 type. */
454 uint32_t l3_type:4; /**< (Outer) L3 type. */
455 uint32_t l4_type:4; /**< (Outer) L4 type. */
456 uint32_t tun_type:4; /**< Tunnel type. */
457 uint32_t inner_l2_type:4; /**< Inner L2 type. */
458 uint32_t inner_l3_type:4; /**< Inner L3 type. */
459 uint32_t inner_l4_type:4; /**< Inner L4 type. */
463 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
464 uint16_t data_len; /**< Amount of data in segment buffer. */
465 /** VLAN TCI (CPU order), valid if PKT_RX_VLAN_STRIPPED is set. */
469 uint32_t rss; /**< RSS hash result if RSS enabled */
478 /**< Second 4 flexible bytes */
481 /**< First 4 flexible bytes or FD ID, dependent on
482 PKT_RX_FDIR_* flag in ol_flags. */
483 } fdir; /**< Filter identifier if FDIR enabled */
487 } sched; /**< Hierarchical scheduler */
488 uint32_t usr; /**< User defined tags. See rte_distributor_process() */
489 } hash; /**< hash information */
491 /** Outer VLAN TCI (CPU order), valid if PKT_RX_QINQ_STRIPPED is set. */
492 uint16_t vlan_tci_outer;
494 uint16_t buf_len; /**< Length of segment buffer. */
496 /** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference
497 * are not normalized but are always the same for a given port.
501 /* second cache line - fields only used in slow path or on TX */
502 MARKER cacheline1 __rte_cache_min_aligned;
506 void *userdata; /**< Can be used for external metadata */
507 uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
510 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
511 struct rte_mbuf *next; /**< Next segment of scattered packet. */
513 /* fields to support TX offloads */
516 uint64_t tx_offload; /**< combined for easy fetch */
520 /**< L2 (MAC) Header Length for non-tunneling pkt.
521 * Outer_L4_len + ... + Inner_L2_len for tunneling pkt.
523 uint64_t l3_len:9; /**< L3 (IP) Header Length. */
524 uint64_t l4_len:8; /**< L4 (TCP/UDP) Header Length. */
525 uint64_t tso_segsz:16; /**< TCP TSO segment size */
527 /* fields for TX offloading of tunnels */
528 uint64_t outer_l3_len:9; /**< Outer L3 (IP) Hdr Length. */
529 uint64_t outer_l2_len:7; /**< Outer L2 (MAC) Hdr Length. */
531 /* uint64_t unused:8; */
535 /** Size of the application private data. In case of an indirect
536 * mbuf, it stores the direct mbuf private data size. */
539 /** Timesync flags for use with IEEE1588. */
542 /** Sequence number. See also rte_reorder_insert(). */
545 } __rte_cache_aligned;
548 * Prefetch the first part of the mbuf
550 * The first 64 bytes of the mbuf corresponds to fields that are used early
551 * in the receive path. If the cache line of the architecture is higher than
552 * 64B, the second part will also be prefetched.
555 * The pointer to the mbuf.
558 rte_mbuf_prefetch_part1(struct rte_mbuf *m)
560 rte_prefetch0(&m->cacheline0);
564 * Prefetch the second part of the mbuf
566 * The next 64 bytes of the mbuf corresponds to fields that are used in the
567 * transmit path. If the cache line of the architecture is higher than 64B,
568 * this function does nothing as it is expected that the full mbuf is
572 * The pointer to the mbuf.
575 rte_mbuf_prefetch_part2(struct rte_mbuf *m)
577 #if RTE_CACHE_LINE_SIZE == 64
578 rte_prefetch0(&m->cacheline1);
585 static inline uint16_t rte_pktmbuf_priv_size(struct rte_mempool *mp);
588 * Return the DMA address of the beginning of the mbuf data
591 * The pointer to the mbuf.
593 * The physical address of the beginning of the mbuf data
595 static inline phys_addr_t
596 rte_mbuf_data_dma_addr(const struct rte_mbuf *mb)
598 return mb->buf_physaddr + mb->data_off;
602 * Return the default DMA address of the beginning of the mbuf data
604 * This function is used by drivers in their receive function, as it
605 * returns the location where data should be written by the NIC, taking
606 * the default headroom in account.
609 * The pointer to the mbuf.
611 * The physical address of the beginning of the mbuf data
613 static inline phys_addr_t
614 rte_mbuf_data_dma_addr_default(const struct rte_mbuf *mb)
616 return mb->buf_physaddr + RTE_PKTMBUF_HEADROOM;
620 * Return the mbuf owning the data buffer address of an indirect mbuf.
623 * The pointer to the indirect mbuf.
625 * The address of the direct mbuf corresponding to buffer_addr.
627 static inline struct rte_mbuf *
628 rte_mbuf_from_indirect(struct rte_mbuf *mi)
630 return (struct rte_mbuf *)RTE_PTR_SUB(mi->buf_addr, sizeof(*mi) + mi->priv_size);
634 * Return the buffer address embedded in the given mbuf.
637 * The pointer to the mbuf.
639 * The address of the data buffer owned by the mbuf.
642 rte_mbuf_to_baddr(struct rte_mbuf *md)
645 buffer_addr = (char *)md + sizeof(*md) + rte_pktmbuf_priv_size(md->pool);
650 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
652 #define RTE_MBUF_INDIRECT(mb) ((mb)->ol_flags & IND_ATTACHED_MBUF)
655 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
657 #define RTE_MBUF_DIRECT(mb) (!RTE_MBUF_INDIRECT(mb))
660 * Private data in case of pktmbuf pool.
662 * A structure that contains some pktmbuf_pool-specific data that are
663 * appended after the mempool structure (in private data).
665 struct rte_pktmbuf_pool_private {
666 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf. */
667 uint16_t mbuf_priv_size; /**< Size of private area in each mbuf. */
670 #ifdef RTE_LIBRTE_MBUF_DEBUG
672 /** check mbuf type in debug mode */
673 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
675 #else /* RTE_LIBRTE_MBUF_DEBUG */
677 /** check mbuf type in debug mode */
678 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
680 #endif /* RTE_LIBRTE_MBUF_DEBUG */
682 #ifdef RTE_MBUF_REFCNT_ATOMIC
685 * Reads the value of an mbuf's refcnt.
689 * Reference count number.
691 static inline uint16_t
692 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
694 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
698 * Sets an mbuf's refcnt to a defined value.
705 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
707 rte_atomic16_set(&m->refcnt_atomic, new_value);
711 * Adds given value to an mbuf's refcnt and returns its new value.
715 * Value to add/subtract
719 static inline uint16_t
720 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
723 * The atomic_add is an expensive operation, so we don't want to
724 * call it in the case where we know we are the uniq holder of
725 * this mbuf (i.e. ref_cnt == 1). Otherwise, an atomic
726 * operation has to be used because concurrent accesses on the
727 * reference counter can occur.
729 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
730 rte_mbuf_refcnt_set(m, 1 + value);
734 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
737 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
740 * Adds given value to an mbuf's refcnt and returns its new value.
742 static inline uint16_t
743 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
745 m->refcnt = (uint16_t)(m->refcnt + value);
750 * Reads the value of an mbuf's refcnt.
752 static inline uint16_t
753 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
759 * Sets an mbuf's refcnt to the defined value.
762 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
764 m->refcnt = new_value;
767 #endif /* RTE_MBUF_REFCNT_ATOMIC */
770 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
777 * Sanity checks on an mbuf.
779 * Check the consistency of the given mbuf. The function will cause a
780 * panic if corruption is detected.
783 * The mbuf to be checked.
785 * True if the mbuf is a packet header, false if it is a sub-segment
786 * of a packet (in this case, some fields like nb_segs are not checked)
789 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
791 #define MBUF_RAW_ALLOC_CHECK(m) do { \
792 RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1); \
793 RTE_ASSERT((m)->next == NULL); \
794 RTE_ASSERT((m)->nb_segs == 1); \
795 __rte_mbuf_sanity_check(m, 0); \
799 * Allocate an unitialized mbuf from mempool *mp*.
801 * This function can be used by PMDs (especially in RX functions) to
802 * allocate an unitialized mbuf. The driver is responsible of
803 * initializing all the required fields. See rte_pktmbuf_reset().
804 * For standard needs, prefer rte_pktmbuf_alloc().
806 * The caller can expect that the following fields of the mbuf structure
807 * are initialized: buf_addr, buf_physaddr, buf_len, refcnt=1, nb_segs=1,
808 * next=NULL, pool, priv_size. The other fields must be initialized
812 * The mempool from which mbuf is allocated.
814 * - The pointer to the new mbuf on success.
815 * - NULL if allocation failed.
817 static inline struct rte_mbuf *rte_mbuf_raw_alloc(struct rte_mempool *mp)
822 if (rte_mempool_get(mp, &mb) < 0)
824 m = (struct rte_mbuf *)mb;
825 MBUF_RAW_ALLOC_CHECK(m);
830 * Put mbuf back into its original mempool.
832 * The caller must ensure that the mbuf is direct and properly
833 * reinitialized (refcnt=1, next=NULL, nb_segs=1), as done by
834 * rte_pktmbuf_prefree_seg().
836 * This function should be used with care, when optimization is
837 * required. For standard needs, prefer rte_pktmbuf_free() or
838 * rte_pktmbuf_free_seg().
841 * The mbuf to be freed.
843 static __rte_always_inline void
844 rte_mbuf_raw_free(struct rte_mbuf *m)
846 RTE_ASSERT(RTE_MBUF_DIRECT(m));
847 RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1);
848 RTE_ASSERT(m->next == NULL);
849 RTE_ASSERT(m->nb_segs == 1);
850 __rte_mbuf_sanity_check(m, 0);
851 rte_mempool_put(m->pool, m);
854 /* compat with older versions */
857 __rte_mbuf_raw_free(struct rte_mbuf *m)
859 rte_mbuf_raw_free(m);
862 /* Operations on ctrl mbuf */
865 * The control mbuf constructor.
867 * This function initializes some fields in an mbuf structure that are
868 * not modified by the user once created (mbuf type, origin pool, buffer
869 * start address, and so on). This function is given as a callback function
870 * to rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
873 * The mempool from which the mbuf is allocated.
875 * A pointer that can be used by the user to retrieve useful information
876 * for mbuf initialization. This pointer is the opaque argument passed to
877 * rte_mempool_obj_iter() or rte_mempool_create().
879 * The mbuf to initialize.
881 * The index of the mbuf in the pool table.
883 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
884 void *m, unsigned i);
887 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
889 * This new mbuf is initialized with data pointing to the beginning of
890 * buffer, and with a length of zero.
893 * The mempool from which the mbuf is allocated.
895 * - The pointer to the new mbuf on success.
896 * - NULL if allocation failed.
898 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
901 * Free a control mbuf back into its original mempool.
904 * The control mbuf to be freed.
906 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
909 * A macro that returns the pointer to the carried data.
911 * The value that can be read or assigned.
916 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
919 * A macro that returns the length of the carried data.
921 * The value that can be read or assigned.
926 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
929 * Tests if an mbuf is a control mbuf
932 * The mbuf to be tested
934 * - True (1) if the mbuf is a control mbuf
935 * - False(0) otherwise
938 rte_is_ctrlmbuf(struct rte_mbuf *m)
940 return !!(m->ol_flags & CTRL_MBUF_FLAG);
943 /* Operations on pkt mbuf */
946 * The packet mbuf constructor.
948 * This function initializes some fields in the mbuf structure that are
949 * not modified by the user once created (origin pool, buffer start
950 * address, and so on). This function is given as a callback function to
951 * rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
954 * The mempool from which mbufs originate.
956 * A pointer that can be used by the user to retrieve useful information
957 * for mbuf initialization. This pointer is the opaque argument passed to
958 * rte_mempool_obj_iter() or rte_mempool_create().
960 * The mbuf to initialize.
962 * The index of the mbuf in the pool table.
964 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
965 void *m, unsigned i);
969 * A packet mbuf pool constructor.
971 * This function initializes the mempool private data in the case of a
972 * pktmbuf pool. This private data is needed by the driver. The
973 * function must be called on the mempool before it is used, or it
974 * can be given as a callback function to rte_mempool_create() at
975 * pool creation. It can be extended by the user, for example, to
976 * provide another packet size.
979 * The mempool from which mbufs originate.
981 * A pointer that can be used by the user to retrieve useful information
982 * for mbuf initialization. This pointer is the opaque argument passed to
983 * rte_mempool_create().
985 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
988 * Create a mbuf pool.
990 * This function creates and initializes a packet mbuf pool. It is
991 * a wrapper to rte_mempool functions.
994 * The name of the mbuf pool.
996 * The number of elements in the mbuf pool. The optimum size (in terms
997 * of memory usage) for a mempool is when n is a power of two minus one:
1000 * Size of the per-core object cache. See rte_mempool_create() for
1003 * Size of application private are between the rte_mbuf structure
1004 * and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
1005 * @param data_room_size
1006 * Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
1008 * The socket identifier where the memory should be allocated. The
1009 * value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
1012 * The pointer to the new allocated mempool, on success. NULL on error
1013 * with rte_errno set appropriately. Possible rte_errno values include:
1014 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
1015 * - E_RTE_SECONDARY - function was called from a secondary process instance
1016 * - EINVAL - cache size provided is too large, or priv_size is not aligned.
1017 * - ENOSPC - the maximum number of memzones has already been allocated
1018 * - EEXIST - a memzone with the same name already exists
1019 * - ENOMEM - no appropriate memory area found in which to create memzone
1021 struct rte_mempool *
1022 rte_pktmbuf_pool_create(const char *name, unsigned n,
1023 unsigned cache_size, uint16_t priv_size, uint16_t data_room_size,
1027 * Get the data room size of mbufs stored in a pktmbuf_pool
1029 * The data room size is the amount of data that can be stored in a
1030 * mbuf including the headroom (RTE_PKTMBUF_HEADROOM).
1033 * The packet mbuf pool.
1035 * The data room size of mbufs stored in this mempool.
1037 static inline uint16_t
1038 rte_pktmbuf_data_room_size(struct rte_mempool *mp)
1040 struct rte_pktmbuf_pool_private *mbp_priv;
1042 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1043 return mbp_priv->mbuf_data_room_size;
1047 * Get the application private size of mbufs stored in a pktmbuf_pool
1049 * The private size of mbuf is a zone located between the rte_mbuf
1050 * structure and the data buffer where an application can store data
1051 * associated to a packet.
1054 * The packet mbuf pool.
1056 * The private size of mbufs stored in this mempool.
1058 static inline uint16_t
1059 rte_pktmbuf_priv_size(struct rte_mempool *mp)
1061 struct rte_pktmbuf_pool_private *mbp_priv;
1063 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1064 return mbp_priv->mbuf_priv_size;
1068 * Reset the data_off field of a packet mbuf to its default value.
1070 * The given mbuf must have only one segment, which should be empty.
1073 * The packet mbuf's data_off field has to be reset.
1075 static inline void rte_pktmbuf_reset_headroom(struct rte_mbuf *m)
1077 m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM, (uint16_t)m->buf_len);
1081 * Reset the fields of a packet mbuf to their default values.
1083 * The given mbuf must have only one segment.
1086 * The packet mbuf to be resetted.
1088 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
1094 m->vlan_tci_outer = 0;
1100 rte_pktmbuf_reset_headroom(m);
1103 __rte_mbuf_sanity_check(m, 1);
1107 * Allocate a new mbuf from a mempool.
1109 * This new mbuf contains one segment, which has a length of 0. The pointer
1110 * to data is initialized to have some bytes of headroom in the buffer
1111 * (if buffer size allows).
1114 * The mempool from which the mbuf is allocated.
1116 * - The pointer to the new mbuf on success.
1117 * - NULL if allocation failed.
1119 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
1122 if ((m = rte_mbuf_raw_alloc(mp)) != NULL)
1123 rte_pktmbuf_reset(m);
1128 * Allocate a bulk of mbufs, initialize refcnt and reset the fields to default
1132 * The mempool from which mbufs are allocated.
1134 * Array of pointers to mbufs
1140 static inline int rte_pktmbuf_alloc_bulk(struct rte_mempool *pool,
1141 struct rte_mbuf **mbufs, unsigned count)
1146 rc = rte_mempool_get_bulk(pool, (void **)mbufs, count);
1150 /* To understand duff's device on loop unwinding optimization, see
1151 * https://en.wikipedia.org/wiki/Duff's_device.
1152 * Here while() loop is used rather than do() while{} to avoid extra
1153 * check if count is zero.
1155 switch (count % 4) {
1157 while (idx != count) {
1158 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1159 rte_pktmbuf_reset(mbufs[idx]);
1163 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1164 rte_pktmbuf_reset(mbufs[idx]);
1168 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1169 rte_pktmbuf_reset(mbufs[idx]);
1173 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1174 rte_pktmbuf_reset(mbufs[idx]);
1183 * Attach packet mbuf to another packet mbuf.
1185 * After attachment we refer the mbuf we attached as 'indirect',
1186 * while mbuf we attached to as 'direct'.
1187 * The direct mbuf's reference counter is incremented.
1189 * Right now, not supported:
1190 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
1191 * - mbuf we trying to attach (mi) is used by someone else
1192 * e.g. it's reference counter is greater then 1.
1195 * The indirect packet mbuf.
1197 * The packet mbuf we're attaching to.
1199 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m)
1201 struct rte_mbuf *md;
1203 RTE_ASSERT(RTE_MBUF_DIRECT(mi) &&
1204 rte_mbuf_refcnt_read(mi) == 1);
1206 /* if m is not direct, get the mbuf that embeds the data */
1207 if (RTE_MBUF_DIRECT(m))
1210 md = rte_mbuf_from_indirect(m);
1212 rte_mbuf_refcnt_update(md, 1);
1213 mi->priv_size = m->priv_size;
1214 mi->buf_physaddr = m->buf_physaddr;
1215 mi->buf_addr = m->buf_addr;
1216 mi->buf_len = m->buf_len;
1218 mi->data_off = m->data_off;
1219 mi->data_len = m->data_len;
1221 mi->vlan_tci = m->vlan_tci;
1222 mi->vlan_tci_outer = m->vlan_tci_outer;
1223 mi->tx_offload = m->tx_offload;
1227 mi->pkt_len = mi->data_len;
1229 mi->ol_flags = m->ol_flags | IND_ATTACHED_MBUF;
1230 mi->packet_type = m->packet_type;
1231 mi->timestamp = m->timestamp;
1233 __rte_mbuf_sanity_check(mi, 1);
1234 __rte_mbuf_sanity_check(m, 0);
1238 * Detach an indirect packet mbuf.
1240 * - restore original mbuf address and length values.
1241 * - reset pktmbuf data and data_len to their default values.
1242 * - decrement the direct mbuf's reference counter. When the
1243 * reference counter becomes 0, the direct mbuf is freed.
1245 * All other fields of the given packet mbuf will be left intact.
1248 * The indirect attached packet mbuf.
1250 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
1252 struct rte_mbuf *md = rte_mbuf_from_indirect(m);
1253 struct rte_mempool *mp = m->pool;
1254 uint32_t mbuf_size, buf_len, priv_size;
1256 priv_size = rte_pktmbuf_priv_size(mp);
1257 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
1258 buf_len = rte_pktmbuf_data_room_size(mp);
1260 m->priv_size = priv_size;
1261 m->buf_addr = (char *)m + mbuf_size;
1262 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + mbuf_size;
1263 m->buf_len = (uint16_t)buf_len;
1264 rte_pktmbuf_reset_headroom(m);
1268 if (rte_mbuf_refcnt_update(md, -1) == 0) {
1271 rte_mbuf_refcnt_set(md, 1);
1272 rte_mbuf_raw_free(md);
1277 * Decrease reference counter and unlink a mbuf segment
1279 * This function does the same than a free, except that it does not
1280 * return the segment to its pool.
1281 * It decreases the reference counter, and if it reaches 0, it is
1282 * detached from its parent for an indirect mbuf.
1285 * The mbuf to be unlinked
1287 * - (m) if it is the last reference. It can be recycled or freed.
1288 * - (NULL) if the mbuf still has remaining references on it.
1290 static __rte_always_inline struct rte_mbuf *
1291 rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1293 __rte_mbuf_sanity_check(m, 0);
1295 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
1297 if (RTE_MBUF_INDIRECT(m))
1298 rte_pktmbuf_detach(m);
1300 if (m->next != NULL) {
1307 } else if (rte_atomic16_add_return(&m->refcnt_atomic, -1) == 0) {
1310 if (RTE_MBUF_INDIRECT(m))
1311 rte_pktmbuf_detach(m);
1313 if (m->next != NULL) {
1317 rte_mbuf_refcnt_set(m, 1);
1324 /* deprecated, replaced by rte_pktmbuf_prefree_seg() */
1326 static inline struct rte_mbuf *
1327 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1329 return rte_pktmbuf_prefree_seg(m);
1333 * Free a segment of a packet mbuf into its original mempool.
1335 * Free an mbuf, without parsing other segments in case of chained
1339 * The packet mbuf segment to be freed.
1341 static __rte_always_inline void
1342 rte_pktmbuf_free_seg(struct rte_mbuf *m)
1344 m = rte_pktmbuf_prefree_seg(m);
1345 if (likely(m != NULL))
1346 rte_mbuf_raw_free(m);
1350 * Free a packet mbuf back into its original mempool.
1352 * Free an mbuf, and all its segments in case of chained buffers. Each
1353 * segment is added back into its original mempool.
1356 * The packet mbuf to be freed.
1358 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
1360 struct rte_mbuf *m_next;
1362 __rte_mbuf_sanity_check(m, 1);
1366 rte_pktmbuf_free_seg(m);
1372 * Creates a "clone" of the given packet mbuf.
1374 * Walks through all segments of the given packet mbuf, and for each of them:
1375 * - Creates a new packet mbuf from the given pool.
1376 * - Attaches newly created mbuf to the segment.
1377 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
1378 * from the original packet mbuf.
1381 * The packet mbuf to be cloned.
1383 * The mempool from which the "clone" mbufs are allocated.
1385 * - The pointer to the new "clone" mbuf on success.
1386 * - NULL if allocation fails.
1388 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
1389 struct rte_mempool *mp)
1391 struct rte_mbuf *mc, *mi, **prev;
1395 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
1400 pktlen = md->pkt_len;
1405 rte_pktmbuf_attach(mi, md);
1408 } while ((md = md->next) != NULL &&
1409 (mi = rte_pktmbuf_alloc(mp)) != NULL);
1413 mc->pkt_len = pktlen;
1415 /* Allocation of new indirect segment failed */
1416 if (unlikely (mi == NULL)) {
1417 rte_pktmbuf_free(mc);
1421 __rte_mbuf_sanity_check(mc, 1);
1426 * Adds given value to the refcnt of all packet mbuf segments.
1428 * Walks through all segments of given packet mbuf and for each of them
1429 * invokes rte_mbuf_refcnt_update().
1432 * The packet mbuf whose refcnt to be updated.
1434 * The value to add to the mbuf's segments refcnt.
1436 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
1438 __rte_mbuf_sanity_check(m, 1);
1441 rte_mbuf_refcnt_update(m, v);
1442 } while ((m = m->next) != NULL);
1446 * Get the headroom in a packet mbuf.
1451 * The length of the headroom.
1453 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
1455 __rte_mbuf_sanity_check(m, 1);
1460 * Get the tailroom of a packet mbuf.
1465 * The length of the tailroom.
1467 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
1469 __rte_mbuf_sanity_check(m, 1);
1470 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
1475 * Get the last segment of the packet.
1480 * The last segment of the given mbuf.
1482 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
1484 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
1486 __rte_mbuf_sanity_check(m, 1);
1487 while (m2->next != NULL)
1493 * A macro that points to an offset into the data in the mbuf.
1495 * The returned pointer is cast to type t. Before using this
1496 * function, the user must ensure that the first segment is large
1497 * enough to accommodate its data.
1502 * The offset into the mbuf data.
1504 * The type to cast the result into.
1506 #define rte_pktmbuf_mtod_offset(m, t, o) \
1507 ((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
1510 * A macro that points to the start of the data in the mbuf.
1512 * The returned pointer is cast to type t. Before using this
1513 * function, the user must ensure that the first segment is large
1514 * enough to accommodate its data.
1519 * The type to cast the result into.
1521 #define rte_pktmbuf_mtod(m, t) rte_pktmbuf_mtod_offset(m, t, 0)
1524 * A macro that returns the physical address that points to an offset of the
1525 * start of the data in the mbuf
1530 * The offset into the data to calculate address from.
1532 #define rte_pktmbuf_mtophys_offset(m, o) \
1533 (phys_addr_t)((m)->buf_physaddr + (m)->data_off + (o))
1536 * A macro that returns the physical address that points to the start of the
1542 #define rte_pktmbuf_mtophys(m) rte_pktmbuf_mtophys_offset(m, 0)
1545 * A macro that returns the length of the packet.
1547 * The value can be read or assigned.
1552 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
1555 * A macro that returns the length of the segment.
1557 * The value can be read or assigned.
1562 #define rte_pktmbuf_data_len(m) ((m)->data_len)
1565 * Prepend len bytes to an mbuf data area.
1567 * Returns a pointer to the new
1568 * data start address. If there is not enough headroom in the first
1569 * segment, the function will return NULL, without modifying the mbuf.
1574 * The amount of data to prepend (in bytes).
1576 * A pointer to the start of the newly prepended data, or
1577 * NULL if there is not enough headroom space in the first segment
1579 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
1582 __rte_mbuf_sanity_check(m, 1);
1584 if (unlikely(len > rte_pktmbuf_headroom(m)))
1588 m->data_len = (uint16_t)(m->data_len + len);
1589 m->pkt_len = (m->pkt_len + len);
1591 return (char *)m->buf_addr + m->data_off;
1595 * Append len bytes to an mbuf.
1597 * Append len bytes to an mbuf and return a pointer to the start address
1598 * of the added data. If there is not enough tailroom in the last
1599 * segment, the function will return NULL, without modifying the mbuf.
1604 * The amount of data to append (in bytes).
1606 * A pointer to the start of the newly appended data, or
1607 * NULL if there is not enough tailroom space in the last segment
1609 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
1612 struct rte_mbuf *m_last;
1614 __rte_mbuf_sanity_check(m, 1);
1616 m_last = rte_pktmbuf_lastseg(m);
1617 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
1620 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
1621 m_last->data_len = (uint16_t)(m_last->data_len + len);
1622 m->pkt_len = (m->pkt_len + len);
1623 return (char*) tail;
1627 * Remove len bytes at the beginning of an mbuf.
1629 * Returns a pointer to the start address of the new data area. If the
1630 * length is greater than the length of the first segment, then the
1631 * function will fail and return NULL, without modifying the mbuf.
1636 * The amount of data to remove (in bytes).
1638 * A pointer to the new start of the data.
1640 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
1642 __rte_mbuf_sanity_check(m, 1);
1644 if (unlikely(len > m->data_len))
1647 m->data_len = (uint16_t)(m->data_len - len);
1649 m->pkt_len = (m->pkt_len - len);
1650 return (char *)m->buf_addr + m->data_off;
1654 * Remove len bytes of data at the end of the mbuf.
1656 * If the length is greater than the length of the last segment, the
1657 * function will fail and return -1 without modifying the mbuf.
1662 * The amount of data to remove (in bytes).
1667 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
1669 struct rte_mbuf *m_last;
1671 __rte_mbuf_sanity_check(m, 1);
1673 m_last = rte_pktmbuf_lastseg(m);
1674 if (unlikely(len > m_last->data_len))
1677 m_last->data_len = (uint16_t)(m_last->data_len - len);
1678 m->pkt_len = (m->pkt_len - len);
1683 * Test if mbuf data is contiguous.
1688 * - 1, if all data is contiguous (one segment).
1689 * - 0, if there is several segments.
1691 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
1693 __rte_mbuf_sanity_check(m, 1);
1694 return !!(m->nb_segs == 1);
1698 * @internal used by rte_pktmbuf_read().
1700 const void *__rte_pktmbuf_read(const struct rte_mbuf *m, uint32_t off,
1701 uint32_t len, void *buf);
1704 * Read len data bytes in a mbuf at specified offset.
1706 * If the data is contiguous, return the pointer in the mbuf data, else
1707 * copy the data in the buffer provided by the user and return its
1711 * The pointer to the mbuf.
1713 * The offset of the data in the mbuf.
1715 * The amount of bytes to read.
1717 * The buffer where data is copied if it is not contigous in mbuf
1718 * data. Its length should be at least equal to the len parameter.
1720 * The pointer to the data, either in the mbuf if it is contiguous,
1721 * or in the user buffer. If mbuf is too small, NULL is returned.
1723 static inline const void *rte_pktmbuf_read(const struct rte_mbuf *m,
1724 uint32_t off, uint32_t len, void *buf)
1726 if (likely(off + len <= rte_pktmbuf_data_len(m)))
1727 return rte_pktmbuf_mtod_offset(m, char *, off);
1729 return __rte_pktmbuf_read(m, off, len, buf);
1733 * Chain an mbuf to another, thereby creating a segmented packet.
1735 * Note: The implementation will do a linear walk over the segments to find
1736 * the tail entry. For cases when there are many segments, it's better to
1737 * chain the entries manually.
1740 * The head of the mbuf chain (the first packet)
1742 * The mbuf to put last in the chain
1746 * - -EOVERFLOW, if the chain is full (256 entries)
1748 static inline int rte_pktmbuf_chain(struct rte_mbuf *head, struct rte_mbuf *tail)
1750 struct rte_mbuf *cur_tail;
1752 /* Check for number-of-segments-overflow */
1753 if (head->nb_segs + tail->nb_segs >= 1 << (sizeof(head->nb_segs) * 8))
1756 /* Chain 'tail' onto the old tail */
1757 cur_tail = rte_pktmbuf_lastseg(head);
1758 cur_tail->next = tail;
1760 /* accumulate number of segments and total length. */
1761 head->nb_segs = (uint8_t)(head->nb_segs + tail->nb_segs);
1762 head->pkt_len += tail->pkt_len;
1764 /* pkt_len is only set in the head */
1765 tail->pkt_len = tail->data_len;
1771 * Validate general requirements for Tx offload in mbuf.
1773 * This function checks correctness and completeness of Tx offload settings.
1776 * The packet mbuf to be validated.
1778 * 0 if packet is valid
1781 rte_validate_tx_offload(const struct rte_mbuf *m)
1783 uint64_t ol_flags = m->ol_flags;
1784 uint64_t inner_l3_offset = m->l2_len;
1786 /* Does packet set any of available offloads? */
1787 if (!(ol_flags & PKT_TX_OFFLOAD_MASK))
1790 if (ol_flags & PKT_TX_OUTER_IP_CKSUM)
1791 inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
1793 /* Headers are fragmented */
1794 if (rte_pktmbuf_data_len(m) < inner_l3_offset + m->l3_len + m->l4_len)
1797 /* IP checksum can be counted only for IPv4 packet */
1798 if ((ol_flags & PKT_TX_IP_CKSUM) && (ol_flags & PKT_TX_IPV6))
1801 /* IP type not set when required */
1802 if (ol_flags & (PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
1803 if (!(ol_flags & (PKT_TX_IPV4 | PKT_TX_IPV6)))
1806 /* Check requirements for TSO packet */
1807 if (ol_flags & PKT_TX_TCP_SEG)
1808 if ((m->tso_segsz == 0) ||
1809 ((ol_flags & PKT_TX_IPV4) &&
1810 !(ol_flags & PKT_TX_IP_CKSUM)))
1813 /* PKT_TX_OUTER_IP_CKSUM set for non outer IPv4 packet. */
1814 if ((ol_flags & PKT_TX_OUTER_IP_CKSUM) &&
1815 !(ol_flags & PKT_TX_OUTER_IPV4))
1822 * Linearize data in mbuf.
1824 * This function moves the mbuf data in the first segment if there is enough
1825 * tailroom. The subsequent segments are unchained and freed.
1834 rte_pktmbuf_linearize(struct rte_mbuf *mbuf)
1836 int seg_len, copy_len;
1838 struct rte_mbuf *m_next;
1841 if (rte_pktmbuf_is_contiguous(mbuf))
1844 /* Extend first segment to the total packet length */
1845 copy_len = rte_pktmbuf_pkt_len(mbuf) - rte_pktmbuf_data_len(mbuf);
1847 if (unlikely(copy_len > rte_pktmbuf_tailroom(mbuf)))
1850 buffer = rte_pktmbuf_mtod_offset(mbuf, char *, mbuf->data_len);
1851 mbuf->data_len = (uint16_t)(mbuf->pkt_len);
1853 /* Append data from next segments to the first one */
1858 seg_len = rte_pktmbuf_data_len(m);
1859 rte_memcpy(buffer, rte_pktmbuf_mtod(m, char *), seg_len);
1862 rte_pktmbuf_free_seg(m);
1873 * Dump an mbuf structure to a file.
1875 * Dump all fields for the given packet mbuf and all its associated
1876 * segments (in the case of a chained buffer).
1879 * A pointer to a file for output
1883 * If dump_len != 0, also dump the "dump_len" first data bytes of
1886 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1892 #endif /* _RTE_MBUF_H_ */