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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 * The RX packet is a 802.1q VLAN packet, and the tci has been
93 * saved in in mbuf->vlan_tci.
94 * If the flag PKT_RX_VLAN_STRIPPED is also present, the VLAN
95 * header has been stripped from mbuf data, else it is still
98 #define PKT_RX_VLAN (1ULL << 0)
100 #define PKT_RX_RSS_HASH (1ULL << 1) /**< RX packet with RSS hash result. */
101 #define PKT_RX_FDIR (1ULL << 2) /**< RX packet with FDIR match indicate. */
105 * Checking this flag alone is deprecated: check the 2 bits of
106 * PKT_RX_L4_CKSUM_MASK.
107 * This flag was set when the L4 checksum of a packet was detected as
108 * wrong by the hardware.
110 #define PKT_RX_L4_CKSUM_BAD (1ULL << 3)
114 * Checking this flag alone is deprecated: check the 2 bits of
115 * PKT_RX_IP_CKSUM_MASK.
116 * This flag was set when the IP checksum of a packet was detected as
117 * wrong by the hardware.
119 #define PKT_RX_IP_CKSUM_BAD (1ULL << 4)
121 #define PKT_RX_EIP_CKSUM_BAD (1ULL << 5) /**< External IP header checksum error. */
124 * A vlan has been stripped by the hardware and its tci is saved in
125 * mbuf->vlan_tci. This can only happen if vlan stripping is enabled
126 * in the RX configuration of the PMD.
127 * When PKT_RX_VLAN_STRIPPED is set, PKT_RX_VLAN must also be set.
129 #define PKT_RX_VLAN_STRIPPED (1ULL << 6)
132 * Mask of bits used to determine the status of RX IP checksum.
133 * - PKT_RX_IP_CKSUM_UNKNOWN: no information about the RX IP checksum
134 * - PKT_RX_IP_CKSUM_BAD: the IP checksum in the packet is wrong
135 * - PKT_RX_IP_CKSUM_GOOD: the IP checksum in the packet is valid
136 * - PKT_RX_IP_CKSUM_NONE: the IP checksum is not correct in the packet
137 * data, but the integrity of the IP header is verified.
139 #define PKT_RX_IP_CKSUM_MASK ((1ULL << 4) | (1ULL << 7))
141 #define PKT_RX_IP_CKSUM_UNKNOWN 0
142 #define PKT_RX_IP_CKSUM_BAD (1ULL << 4)
143 #define PKT_RX_IP_CKSUM_GOOD (1ULL << 7)
144 #define PKT_RX_IP_CKSUM_NONE ((1ULL << 4) | (1ULL << 7))
147 * Mask of bits used to determine the status of RX L4 checksum.
148 * - PKT_RX_L4_CKSUM_UNKNOWN: no information about the RX L4 checksum
149 * - PKT_RX_L4_CKSUM_BAD: the L4 checksum in the packet is wrong
150 * - PKT_RX_L4_CKSUM_GOOD: the L4 checksum in the packet is valid
151 * - PKT_RX_L4_CKSUM_NONE: the L4 checksum is not correct in the packet
152 * data, but the integrity of the L4 data is verified.
154 #define PKT_RX_L4_CKSUM_MASK ((1ULL << 3) | (1ULL << 8))
156 #define PKT_RX_L4_CKSUM_UNKNOWN 0
157 #define PKT_RX_L4_CKSUM_BAD (1ULL << 3)
158 #define PKT_RX_L4_CKSUM_GOOD (1ULL << 8)
159 #define PKT_RX_L4_CKSUM_NONE ((1ULL << 3) | (1ULL << 8))
161 #define PKT_RX_IEEE1588_PTP (1ULL << 9) /**< RX IEEE1588 L2 Ethernet PT Packet. */
162 #define PKT_RX_IEEE1588_TMST (1ULL << 10) /**< RX IEEE1588 L2/L4 timestamped packet.*/
163 #define PKT_RX_FDIR_ID (1ULL << 13) /**< FD id reported if FDIR match. */
164 #define PKT_RX_FDIR_FLX (1ULL << 14) /**< Flexible bytes reported if FDIR match. */
167 * The 2 vlans have been stripped by the hardware and their tci are
168 * saved in mbuf->vlan_tci (inner) and mbuf->vlan_tci_outer (outer).
169 * This can only happen if vlan stripping is enabled in the RX
170 * configuration of the PMD. If this flag is set,
171 * When PKT_RX_QINQ_STRIPPED is set, the flags (PKT_RX_VLAN |
172 * PKT_RX_VLAN_STRIPPED | PKT_RX_QINQ) must also be set.
174 #define PKT_RX_QINQ_STRIPPED (1ULL << 15)
177 * When packets are coalesced by a hardware or virtual driver, this flag
178 * can be set in the RX mbuf, meaning that the m->tso_segsz field is
179 * valid and is set to the segment size of original packets.
181 #define PKT_RX_LRO (1ULL << 16)
184 * Indicate that the timestamp field in the mbuf is valid.
186 #define PKT_RX_TIMESTAMP (1ULL << 17)
189 * Indicate that security offload processing was applied on the RX packet.
191 #define PKT_RX_SEC_OFFLOAD (1ULL << 18)
194 * Indicate that security offload processing failed on the RX packet.
196 #define PKT_RX_SEC_OFFLOAD_FAILED (1ULL << 19)
199 * The RX packet is a double VLAN, and the outer tci has been
200 * saved in in mbuf->vlan_tci_outer.
201 * If the flag PKT_RX_QINQ_STRIPPED is also present, both VLANs
202 * headers have been stripped from mbuf data, else they are still
205 #define PKT_RX_QINQ (1ULL << 20)
207 /* add new RX flags here */
209 /* add new TX flags here */
212 * Request security offload processing on the TX packet.
214 #define PKT_TX_SEC_OFFLOAD (1ULL << 43)
217 * Offload the MACsec. This flag must be set by the application to enable
218 * this offload feature for a packet to be transmitted.
220 #define PKT_TX_MACSEC (1ULL << 44)
223 * Bits 45:48 used for the tunnel type.
224 * When doing Tx offload like TSO or checksum, the HW needs to configure the
225 * tunnel type into the HW descriptors.
227 #define PKT_TX_TUNNEL_VXLAN (0x1ULL << 45)
228 #define PKT_TX_TUNNEL_GRE (0x2ULL << 45)
229 #define PKT_TX_TUNNEL_IPIP (0x3ULL << 45)
230 #define PKT_TX_TUNNEL_GENEVE (0x4ULL << 45)
231 /**< TX packet with MPLS-in-UDP RFC 7510 header. */
232 #define PKT_TX_TUNNEL_MPLSINUDP (0x5ULL << 45)
233 /* add new TX TUNNEL type here */
234 #define PKT_TX_TUNNEL_MASK (0xFULL << 45)
237 * Second VLAN insertion (QinQ) flag.
239 #define PKT_TX_QINQ_PKT (1ULL << 49) /**< TX packet with double VLAN inserted. */
242 * TCP segmentation offload. To enable this offload feature for a
243 * packet to be transmitted on hardware supporting TSO:
244 * - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
246 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
247 * - if it's IPv4, set the PKT_TX_IP_CKSUM flag and write the IP checksum
249 * - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
250 * - calculate the pseudo header checksum without taking ip_len in account,
251 * and set it in the TCP header. Refer to rte_ipv4_phdr_cksum() and
252 * rte_ipv6_phdr_cksum() that can be used as helpers.
254 #define PKT_TX_TCP_SEG (1ULL << 50)
256 #define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
259 * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
260 * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
261 * L4 checksum offload, the user needs to:
262 * - fill l2_len and l3_len in mbuf
263 * - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
264 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
265 * - calculate the pseudo header checksum and set it in the L4 header (only
266 * for TCP or UDP). See rte_ipv4_phdr_cksum() and rte_ipv6_phdr_cksum().
267 * For SCTP, set the crc field to 0.
269 #define PKT_TX_L4_NO_CKSUM (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
270 #define PKT_TX_TCP_CKSUM (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */
271 #define PKT_TX_SCTP_CKSUM (2ULL << 52) /**< SCTP cksum of TX pkt. computed by NIC. */
272 #define PKT_TX_UDP_CKSUM (3ULL << 52) /**< UDP cksum of TX pkt. computed by NIC. */
273 #define PKT_TX_L4_MASK (3ULL << 52) /**< Mask for L4 cksum offload request. */
276 * Offload the IP checksum in the hardware. The flag PKT_TX_IPV4 should
277 * also be set by the application, although a PMD will only check
279 * - set the IP checksum field in the packet to 0
280 * - fill the mbuf offload information: l2_len, l3_len
282 #define PKT_TX_IP_CKSUM (1ULL << 54)
285 * Packet is IPv4. This flag must be set when using any offload feature
286 * (TSO, L3 or L4 checksum) to tell the NIC that the packet is an IPv4
287 * packet. If the packet is a tunneled packet, this flag is related to
290 #define PKT_TX_IPV4 (1ULL << 55)
293 * Packet is IPv6. This flag must be set when using an offload feature
294 * (TSO or L4 checksum) to tell the NIC that the packet is an IPv6
295 * packet. If the packet is a tunneled packet, this flag is related to
298 #define PKT_TX_IPV6 (1ULL << 56)
300 #define PKT_TX_VLAN_PKT (1ULL << 57) /**< TX packet is a 802.1q VLAN packet. */
303 * Offload the IP checksum of an external header in the hardware. The
304 * flag PKT_TX_OUTER_IPV4 should also be set by the application, alto ugh
305 * a PMD will only check PKT_TX_IP_CKSUM. The IP checksum field in the
306 * packet must be set to 0.
307 * - set the outer IP checksum field in the packet to 0
308 * - fill the mbuf offload information: outer_l2_len, outer_l3_len
310 #define PKT_TX_OUTER_IP_CKSUM (1ULL << 58)
313 * Packet outer header is IPv4. This flag must be set when using any
314 * outer offload feature (L3 or L4 checksum) to tell the NIC that the
315 * outer header of the tunneled packet is an IPv4 packet.
317 #define PKT_TX_OUTER_IPV4 (1ULL << 59)
320 * Packet outer header is IPv6. This flag must be set when using any
321 * outer offload feature (L4 checksum) to tell the NIC that the outer
322 * header of the tunneled packet is an IPv6 packet.
324 #define PKT_TX_OUTER_IPV6 (1ULL << 60)
327 * Bitmask of all supported packet Tx offload features flags,
328 * which can be set for packet.
330 #define PKT_TX_OFFLOAD_MASK ( \
333 PKT_TX_OUTER_IP_CKSUM | \
335 PKT_TX_IEEE1588_TMST | \
338 PKT_TX_TUNNEL_MASK | \
342 #define __RESERVED (1ULL << 61) /**< reserved for future mbuf use */
344 #define IND_ATTACHED_MBUF (1ULL << 62) /**< Indirect attached mbuf */
346 /* Use final bit of flags to indicate a control mbuf */
347 #define CTRL_MBUF_FLAG (1ULL << 63) /**< Mbuf contains control data */
349 /** Alignment constraint of mbuf private area. */
350 #define RTE_MBUF_PRIV_ALIGN 8
353 * Get the name of a RX offload flag
356 * The mask describing the flag.
358 * The name of this flag, or NULL if it's not a valid RX flag.
360 const char *rte_get_rx_ol_flag_name(uint64_t mask);
363 * Dump the list of RX offload flags in a buffer
366 * The mask describing the RX flags.
370 * The length of the buffer.
372 * 0 on success, (-1) on error.
374 int rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
377 * Get the name of a TX offload flag
380 * The mask describing the flag. Usually only one bit must be set.
381 * Several bits can be given if they belong to the same mask.
382 * Ex: PKT_TX_L4_MASK.
384 * The name of this flag, or NULL if it's not a valid TX flag.
386 const char *rte_get_tx_ol_flag_name(uint64_t mask);
389 * Dump the list of TX offload flags in a buffer
392 * The mask describing the TX flags.
396 * The length of the buffer.
398 * 0 on success, (-1) on error.
400 int rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
403 * Some NICs need at least 2KB buffer to RX standard Ethernet frame without
404 * splitting it into multiple segments.
405 * So, for mbufs that planned to be involved into RX/TX, the recommended
406 * minimal buffer length is 2KB + RTE_PKTMBUF_HEADROOM.
408 #define RTE_MBUF_DEFAULT_DATAROOM 2048
409 #define RTE_MBUF_DEFAULT_BUF_SIZE \
410 (RTE_MBUF_DEFAULT_DATAROOM + RTE_PKTMBUF_HEADROOM)
412 /* define a set of marker types that can be used to refer to set points in the
415 typedef void *MARKER[0]; /**< generic marker for a point in a structure */
417 typedef uint8_t MARKER8[0]; /**< generic marker with 1B alignment */
419 typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
420 * with a single assignment */
423 * The generic rte_mbuf, containing a packet mbuf.
428 void *buf_addr; /**< Virtual address of segment buffer. */
430 * Physical address of segment buffer.
431 * Force alignment to 8-bytes, so as to ensure we have the exact
432 * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes
433 * working on vector drivers easier.
435 phys_addr_t buf_physaddr __rte_aligned(sizeof(phys_addr_t));
437 /* next 8 bytes are initialised on RX descriptor rearm */
442 * Reference counter. Its size should at least equal to the size
443 * of port field (16 bits), to support zero-copy broadcast.
444 * It should only be accessed using the following functions:
445 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
446 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
447 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
452 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
453 uint16_t refcnt; /**< Non-atomically accessed refcnt */
455 uint16_t nb_segs; /**< Number of segments. */
457 /** Input port (16 bits to support more than 256 virtual ports). */
460 uint64_t ol_flags; /**< Offload features. */
462 /* remaining bytes are set on RX when pulling packet from descriptor */
463 MARKER rx_descriptor_fields1;
466 * The packet type, which is the combination of outer/inner L2, L3, L4
467 * and tunnel types. The packet_type is about data really present in the
468 * mbuf. Example: if vlan stripping is enabled, a received vlan packet
469 * would have RTE_PTYPE_L2_ETHER and not RTE_PTYPE_L2_VLAN because the
470 * vlan is stripped from the data.
474 uint32_t packet_type; /**< L2/L3/L4 and tunnel information. */
476 uint32_t l2_type:4; /**< (Outer) L2 type. */
477 uint32_t l3_type:4; /**< (Outer) L3 type. */
478 uint32_t l4_type:4; /**< (Outer) L4 type. */
479 uint32_t tun_type:4; /**< Tunnel type. */
482 uint8_t inner_esp_next_proto;
483 /**< ESP next protocol type, valid if
484 * RTE_PTYPE_TUNNEL_ESP tunnel type is set
489 uint8_t inner_l2_type:4;
490 /**< Inner L2 type. */
491 uint8_t inner_l3_type:4;
492 /**< Inner L3 type. */
495 uint32_t inner_l4_type:4; /**< Inner L4 type. */
499 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
500 uint16_t data_len; /**< Amount of data in segment buffer. */
501 /** VLAN TCI (CPU order), valid if PKT_RX_VLAN_STRIPPED is set. */
505 uint32_t rss; /**< RSS hash result if RSS enabled */
514 /**< Second 4 flexible bytes */
517 /**< First 4 flexible bytes or FD ID, dependent on
518 PKT_RX_FDIR_* flag in ol_flags. */
519 } fdir; /**< Filter identifier if FDIR enabled */
523 } sched; /**< Hierarchical scheduler */
524 uint32_t usr; /**< User defined tags. See rte_distributor_process() */
525 } hash; /**< hash information */
527 /** Outer VLAN TCI (CPU order), valid if PKT_RX_QINQ_STRIPPED is set. */
528 uint16_t vlan_tci_outer;
530 uint16_t buf_len; /**< Length of segment buffer. */
532 /** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference
533 * are not normalized but are always the same for a given port.
537 /* second cache line - fields only used in slow path or on TX */
538 MARKER cacheline1 __rte_cache_min_aligned;
542 void *userdata; /**< Can be used for external metadata */
543 uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
546 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
547 struct rte_mbuf *next; /**< Next segment of scattered packet. */
549 /* fields to support TX offloads */
552 uint64_t tx_offload; /**< combined for easy fetch */
556 /**< L2 (MAC) Header Length for non-tunneling pkt.
557 * Outer_L4_len + ... + Inner_L2_len for tunneling pkt.
559 uint64_t l3_len:9; /**< L3 (IP) Header Length. */
560 uint64_t l4_len:8; /**< L4 (TCP/UDP) Header Length. */
561 uint64_t tso_segsz:16; /**< TCP TSO segment size */
563 /* fields for TX offloading of tunnels */
564 uint64_t outer_l3_len:9; /**< Outer L3 (IP) Hdr Length. */
565 uint64_t outer_l2_len:7; /**< Outer L2 (MAC) Hdr Length. */
567 /* uint64_t unused:8; */
571 /** Size of the application private data. In case of an indirect
572 * mbuf, it stores the direct mbuf private data size. */
575 /** Timesync flags for use with IEEE1588. */
578 /** Sequence number. See also rte_reorder_insert(). */
581 } __rte_cache_aligned;
584 * Prefetch the first part of the mbuf
586 * The first 64 bytes of the mbuf corresponds to fields that are used early
587 * in the receive path. If the cache line of the architecture is higher than
588 * 64B, the second part will also be prefetched.
591 * The pointer to the mbuf.
594 rte_mbuf_prefetch_part1(struct rte_mbuf *m)
596 rte_prefetch0(&m->cacheline0);
600 * Prefetch the second part of the mbuf
602 * The next 64 bytes of the mbuf corresponds to fields that are used in the
603 * transmit path. If the cache line of the architecture is higher than 64B,
604 * this function does nothing as it is expected that the full mbuf is
608 * The pointer to the mbuf.
611 rte_mbuf_prefetch_part2(struct rte_mbuf *m)
613 #if RTE_CACHE_LINE_SIZE == 64
614 rte_prefetch0(&m->cacheline1);
621 static inline uint16_t rte_pktmbuf_priv_size(struct rte_mempool *mp);
624 * Return the DMA address of the beginning of the mbuf data
627 * The pointer to the mbuf.
629 * The physical address of the beginning of the mbuf data
631 static inline phys_addr_t
632 rte_mbuf_data_dma_addr(const struct rte_mbuf *mb)
634 return mb->buf_physaddr + mb->data_off;
638 * Return the default DMA address of the beginning of the mbuf data
640 * This function is used by drivers in their receive function, as it
641 * returns the location where data should be written by the NIC, taking
642 * the default headroom in account.
645 * The pointer to the mbuf.
647 * The physical address of the beginning of the mbuf data
649 static inline phys_addr_t
650 rte_mbuf_data_dma_addr_default(const struct rte_mbuf *mb)
652 return mb->buf_physaddr + RTE_PKTMBUF_HEADROOM;
656 * Return the mbuf owning the data buffer address of an indirect mbuf.
659 * The pointer to the indirect mbuf.
661 * The address of the direct mbuf corresponding to buffer_addr.
663 static inline struct rte_mbuf *
664 rte_mbuf_from_indirect(struct rte_mbuf *mi)
666 return (struct rte_mbuf *)RTE_PTR_SUB(mi->buf_addr, sizeof(*mi) + mi->priv_size);
670 * Return the buffer address embedded in the given mbuf.
673 * The pointer to the mbuf.
675 * The address of the data buffer owned by the mbuf.
678 rte_mbuf_to_baddr(struct rte_mbuf *md)
681 buffer_addr = (char *)md + sizeof(*md) + rte_pktmbuf_priv_size(md->pool);
686 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
688 #define RTE_MBUF_INDIRECT(mb) ((mb)->ol_flags & IND_ATTACHED_MBUF)
691 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
693 #define RTE_MBUF_DIRECT(mb) (!RTE_MBUF_INDIRECT(mb))
696 * Private data in case of pktmbuf pool.
698 * A structure that contains some pktmbuf_pool-specific data that are
699 * appended after the mempool structure (in private data).
701 struct rte_pktmbuf_pool_private {
702 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf. */
703 uint16_t mbuf_priv_size; /**< Size of private area in each mbuf. */
706 #ifdef RTE_LIBRTE_MBUF_DEBUG
708 /** check mbuf type in debug mode */
709 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
711 #else /* RTE_LIBRTE_MBUF_DEBUG */
713 /** check mbuf type in debug mode */
714 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
716 #endif /* RTE_LIBRTE_MBUF_DEBUG */
718 #ifdef RTE_MBUF_REFCNT_ATOMIC
721 * Reads the value of an mbuf's refcnt.
725 * Reference count number.
727 static inline uint16_t
728 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
730 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
734 * Sets an mbuf's refcnt to a defined value.
741 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
743 rte_atomic16_set(&m->refcnt_atomic, new_value);
747 * Adds given value to an mbuf's refcnt and returns its new value.
751 * Value to add/subtract
755 static inline uint16_t
756 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
759 * The atomic_add is an expensive operation, so we don't want to
760 * call it in the case where we know we are the uniq holder of
761 * this mbuf (i.e. ref_cnt == 1). Otherwise, an atomic
762 * operation has to be used because concurrent accesses on the
763 * reference counter can occur.
765 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
766 rte_mbuf_refcnt_set(m, 1 + value);
770 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
773 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
776 * Adds given value to an mbuf's refcnt and returns its new value.
778 static inline uint16_t
779 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
781 m->refcnt = (uint16_t)(m->refcnt + value);
786 * Reads the value of an mbuf's refcnt.
788 static inline uint16_t
789 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
795 * Sets an mbuf's refcnt to the defined value.
798 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
800 m->refcnt = new_value;
803 #endif /* RTE_MBUF_REFCNT_ATOMIC */
806 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
813 * Sanity checks on an mbuf.
815 * Check the consistency of the given mbuf. The function will cause a
816 * panic if corruption is detected.
819 * The mbuf to be checked.
821 * True if the mbuf is a packet header, false if it is a sub-segment
822 * of a packet (in this case, some fields like nb_segs are not checked)
825 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
827 #define MBUF_RAW_ALLOC_CHECK(m) do { \
828 RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1); \
829 RTE_ASSERT((m)->next == NULL); \
830 RTE_ASSERT((m)->nb_segs == 1); \
831 __rte_mbuf_sanity_check(m, 0); \
835 * Allocate an unitialized mbuf from mempool *mp*.
837 * This function can be used by PMDs (especially in RX functions) to
838 * allocate an unitialized mbuf. The driver is responsible of
839 * initializing all the required fields. See rte_pktmbuf_reset().
840 * For standard needs, prefer rte_pktmbuf_alloc().
842 * The caller can expect that the following fields of the mbuf structure
843 * are initialized: buf_addr, buf_physaddr, buf_len, refcnt=1, nb_segs=1,
844 * next=NULL, pool, priv_size. The other fields must be initialized
848 * The mempool from which mbuf is allocated.
850 * - The pointer to the new mbuf on success.
851 * - NULL if allocation failed.
853 static inline struct rte_mbuf *rte_mbuf_raw_alloc(struct rte_mempool *mp)
858 if (rte_mempool_get(mp, &mb) < 0)
860 m = (struct rte_mbuf *)mb;
861 MBUF_RAW_ALLOC_CHECK(m);
866 * Put mbuf back into its original mempool.
868 * The caller must ensure that the mbuf is direct and properly
869 * reinitialized (refcnt=1, next=NULL, nb_segs=1), as done by
870 * rte_pktmbuf_prefree_seg().
872 * This function should be used with care, when optimization is
873 * required. For standard needs, prefer rte_pktmbuf_free() or
874 * rte_pktmbuf_free_seg().
877 * The mbuf to be freed.
879 static __rte_always_inline void
880 rte_mbuf_raw_free(struct rte_mbuf *m)
882 RTE_ASSERT(RTE_MBUF_DIRECT(m));
883 RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1);
884 RTE_ASSERT(m->next == NULL);
885 RTE_ASSERT(m->nb_segs == 1);
886 __rte_mbuf_sanity_check(m, 0);
887 rte_mempool_put(m->pool, m);
890 /* compat with older versions */
893 __rte_mbuf_raw_free(struct rte_mbuf *m)
895 rte_mbuf_raw_free(m);
898 /* Operations on ctrl mbuf */
901 * The control mbuf constructor.
903 * This function initializes some fields in an mbuf structure that are
904 * not modified by the user once created (mbuf type, origin pool, buffer
905 * start address, and so on). This function is given as a callback function
906 * to rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
909 * The mempool from which the mbuf is allocated.
911 * A pointer that can be used by the user to retrieve useful information
912 * for mbuf initialization. This pointer is the opaque argument passed to
913 * rte_mempool_obj_iter() or rte_mempool_create().
915 * The mbuf to initialize.
917 * The index of the mbuf in the pool table.
919 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
920 void *m, unsigned i);
923 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
925 * This new mbuf is initialized with data pointing to the beginning of
926 * buffer, and with a length of zero.
929 * The mempool from which the mbuf is allocated.
931 * - The pointer to the new mbuf on success.
932 * - NULL if allocation failed.
934 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
937 * Free a control mbuf back into its original mempool.
940 * The control mbuf to be freed.
942 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
945 * A macro that returns the pointer to the carried data.
947 * The value that can be read or assigned.
952 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
955 * A macro that returns the length of the carried data.
957 * The value that can be read or assigned.
962 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
965 * Tests if an mbuf is a control mbuf
968 * The mbuf to be tested
970 * - True (1) if the mbuf is a control mbuf
971 * - False(0) otherwise
974 rte_is_ctrlmbuf(struct rte_mbuf *m)
976 return !!(m->ol_flags & CTRL_MBUF_FLAG);
979 /* Operations on pkt mbuf */
982 * The packet mbuf constructor.
984 * This function initializes some fields in the mbuf structure that are
985 * not modified by the user once created (origin pool, buffer start
986 * address, and so on). This function is given as a callback function to
987 * rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
990 * The mempool from which mbufs originate.
992 * A pointer that can be used by the user to retrieve useful information
993 * for mbuf initialization. This pointer is the opaque argument passed to
994 * rte_mempool_obj_iter() or rte_mempool_create().
996 * The mbuf to initialize.
998 * The index of the mbuf in the pool table.
1000 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
1001 void *m, unsigned i);
1005 * A packet mbuf pool constructor.
1007 * This function initializes the mempool private data in the case of a
1008 * pktmbuf pool. This private data is needed by the driver. The
1009 * function must be called on the mempool before it is used, or it
1010 * can be given as a callback function to rte_mempool_create() at
1011 * pool creation. It can be extended by the user, for example, to
1012 * provide another packet size.
1015 * The mempool from which mbufs originate.
1017 * A pointer that can be used by the user to retrieve useful information
1018 * for mbuf initialization. This pointer is the opaque argument passed to
1019 * rte_mempool_create().
1021 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
1024 * Create a mbuf pool.
1026 * This function creates and initializes a packet mbuf pool. It is
1027 * a wrapper to rte_mempool functions.
1030 * The name of the mbuf pool.
1032 * The number of elements in the mbuf pool. The optimum size (in terms
1033 * of memory usage) for a mempool is when n is a power of two minus one:
1036 * Size of the per-core object cache. See rte_mempool_create() for
1039 * Size of application private are between the rte_mbuf structure
1040 * and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
1041 * @param data_room_size
1042 * Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
1044 * The socket identifier where the memory should be allocated. The
1045 * value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
1048 * The pointer to the new allocated mempool, on success. NULL on error
1049 * with rte_errno set appropriately. Possible rte_errno values include:
1050 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
1051 * - E_RTE_SECONDARY - function was called from a secondary process instance
1052 * - EINVAL - cache size provided is too large, or priv_size is not aligned.
1053 * - ENOSPC - the maximum number of memzones has already been allocated
1054 * - EEXIST - a memzone with the same name already exists
1055 * - ENOMEM - no appropriate memory area found in which to create memzone
1057 struct rte_mempool *
1058 rte_pktmbuf_pool_create(const char *name, unsigned n,
1059 unsigned cache_size, uint16_t priv_size, uint16_t data_room_size,
1063 * Get the data room size of mbufs stored in a pktmbuf_pool
1065 * The data room size is the amount of data that can be stored in a
1066 * mbuf including the headroom (RTE_PKTMBUF_HEADROOM).
1069 * The packet mbuf pool.
1071 * The data room size of mbufs stored in this mempool.
1073 static inline uint16_t
1074 rte_pktmbuf_data_room_size(struct rte_mempool *mp)
1076 struct rte_pktmbuf_pool_private *mbp_priv;
1078 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1079 return mbp_priv->mbuf_data_room_size;
1083 * Get the application private size of mbufs stored in a pktmbuf_pool
1085 * The private size of mbuf is a zone located between the rte_mbuf
1086 * structure and the data buffer where an application can store data
1087 * associated to a packet.
1090 * The packet mbuf pool.
1092 * The private size of mbufs stored in this mempool.
1094 static inline uint16_t
1095 rte_pktmbuf_priv_size(struct rte_mempool *mp)
1097 struct rte_pktmbuf_pool_private *mbp_priv;
1099 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1100 return mbp_priv->mbuf_priv_size;
1104 * Reset the data_off field of a packet mbuf to its default value.
1106 * The given mbuf must have only one segment, which should be empty.
1109 * The packet mbuf's data_off field has to be reset.
1111 static inline void rte_pktmbuf_reset_headroom(struct rte_mbuf *m)
1113 m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM, (uint16_t)m->buf_len);
1117 * Reset the fields of a packet mbuf to their default values.
1119 * The given mbuf must have only one segment.
1122 * The packet mbuf to be resetted.
1124 #define MBUF_INVALID_PORT UINT16_MAX
1126 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
1132 m->vlan_tci_outer = 0;
1134 m->port = MBUF_INVALID_PORT;
1138 rte_pktmbuf_reset_headroom(m);
1141 __rte_mbuf_sanity_check(m, 1);
1145 * Allocate a new mbuf from a mempool.
1147 * This new mbuf contains one segment, which has a length of 0. The pointer
1148 * to data is initialized to have some bytes of headroom in the buffer
1149 * (if buffer size allows).
1152 * The mempool from which the mbuf is allocated.
1154 * - The pointer to the new mbuf on success.
1155 * - NULL if allocation failed.
1157 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
1160 if ((m = rte_mbuf_raw_alloc(mp)) != NULL)
1161 rte_pktmbuf_reset(m);
1166 * Allocate a bulk of mbufs, initialize refcnt and reset the fields to default
1170 * The mempool from which mbufs are allocated.
1172 * Array of pointers to mbufs
1177 * - -ENOENT: Not enough entries in the mempool; no mbufs are retrieved.
1179 static inline int rte_pktmbuf_alloc_bulk(struct rte_mempool *pool,
1180 struct rte_mbuf **mbufs, unsigned count)
1185 rc = rte_mempool_get_bulk(pool, (void **)mbufs, count);
1189 /* To understand duff's device on loop unwinding optimization, see
1190 * https://en.wikipedia.org/wiki/Duff's_device.
1191 * Here while() loop is used rather than do() while{} to avoid extra
1192 * check if count is zero.
1194 switch (count % 4) {
1196 while (idx != count) {
1197 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1198 rte_pktmbuf_reset(mbufs[idx]);
1202 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1203 rte_pktmbuf_reset(mbufs[idx]);
1207 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1208 rte_pktmbuf_reset(mbufs[idx]);
1212 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1213 rte_pktmbuf_reset(mbufs[idx]);
1222 * Attach packet mbuf to another packet mbuf.
1224 * After attachment we refer the mbuf we attached as 'indirect',
1225 * while mbuf we attached to as 'direct'.
1226 * The direct mbuf's reference counter is incremented.
1228 * Right now, not supported:
1229 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
1230 * - mbuf we trying to attach (mi) is used by someone else
1231 * e.g. it's reference counter is greater then 1.
1234 * The indirect packet mbuf.
1236 * The packet mbuf we're attaching to.
1238 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m)
1240 struct rte_mbuf *md;
1242 RTE_ASSERT(RTE_MBUF_DIRECT(mi) &&
1243 rte_mbuf_refcnt_read(mi) == 1);
1245 /* if m is not direct, get the mbuf that embeds the data */
1246 if (RTE_MBUF_DIRECT(m))
1249 md = rte_mbuf_from_indirect(m);
1251 rte_mbuf_refcnt_update(md, 1);
1252 mi->priv_size = m->priv_size;
1253 mi->buf_physaddr = m->buf_physaddr;
1254 mi->buf_addr = m->buf_addr;
1255 mi->buf_len = m->buf_len;
1257 mi->data_off = m->data_off;
1258 mi->data_len = m->data_len;
1260 mi->vlan_tci = m->vlan_tci;
1261 mi->vlan_tci_outer = m->vlan_tci_outer;
1262 mi->tx_offload = m->tx_offload;
1266 mi->pkt_len = mi->data_len;
1268 mi->ol_flags = m->ol_flags | IND_ATTACHED_MBUF;
1269 mi->packet_type = m->packet_type;
1270 mi->timestamp = m->timestamp;
1272 __rte_mbuf_sanity_check(mi, 1);
1273 __rte_mbuf_sanity_check(m, 0);
1277 * Detach an indirect packet mbuf.
1279 * - restore original mbuf address and length values.
1280 * - reset pktmbuf data and data_len to their default values.
1281 * - decrement the direct mbuf's reference counter. When the
1282 * reference counter becomes 0, the direct mbuf is freed.
1284 * All other fields of the given packet mbuf will be left intact.
1287 * The indirect attached packet mbuf.
1289 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
1291 struct rte_mbuf *md = rte_mbuf_from_indirect(m);
1292 struct rte_mempool *mp = m->pool;
1293 uint32_t mbuf_size, buf_len, priv_size;
1295 priv_size = rte_pktmbuf_priv_size(mp);
1296 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
1297 buf_len = rte_pktmbuf_data_room_size(mp);
1299 m->priv_size = priv_size;
1300 m->buf_addr = (char *)m + mbuf_size;
1301 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + mbuf_size;
1302 m->buf_len = (uint16_t)buf_len;
1303 rte_pktmbuf_reset_headroom(m);
1307 if (rte_mbuf_refcnt_update(md, -1) == 0) {
1310 rte_mbuf_refcnt_set(md, 1);
1311 rte_mbuf_raw_free(md);
1316 * Decrease reference counter and unlink a mbuf segment
1318 * This function does the same than a free, except that it does not
1319 * return the segment to its pool.
1320 * It decreases the reference counter, and if it reaches 0, it is
1321 * detached from its parent for an indirect mbuf.
1324 * The mbuf to be unlinked
1326 * - (m) if it is the last reference. It can be recycled or freed.
1327 * - (NULL) if the mbuf still has remaining references on it.
1329 static __rte_always_inline struct rte_mbuf *
1330 rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1332 __rte_mbuf_sanity_check(m, 0);
1334 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
1336 if (RTE_MBUF_INDIRECT(m))
1337 rte_pktmbuf_detach(m);
1339 if (m->next != NULL) {
1346 } else if (rte_atomic16_add_return(&m->refcnt_atomic, -1) == 0) {
1349 if (RTE_MBUF_INDIRECT(m))
1350 rte_pktmbuf_detach(m);
1352 if (m->next != NULL) {
1356 rte_mbuf_refcnt_set(m, 1);
1363 /* deprecated, replaced by rte_pktmbuf_prefree_seg() */
1365 static inline struct rte_mbuf *
1366 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1368 return rte_pktmbuf_prefree_seg(m);
1372 * Free a segment of a packet mbuf into its original mempool.
1374 * Free an mbuf, without parsing other segments in case of chained
1378 * The packet mbuf segment to be freed.
1380 static __rte_always_inline void
1381 rte_pktmbuf_free_seg(struct rte_mbuf *m)
1383 m = rte_pktmbuf_prefree_seg(m);
1384 if (likely(m != NULL))
1385 rte_mbuf_raw_free(m);
1389 * Free a packet mbuf back into its original mempool.
1391 * Free an mbuf, and all its segments in case of chained buffers. Each
1392 * segment is added back into its original mempool.
1395 * The packet mbuf to be freed.
1397 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
1399 struct rte_mbuf *m_next;
1401 __rte_mbuf_sanity_check(m, 1);
1405 rte_pktmbuf_free_seg(m);
1411 * Creates a "clone" of the given packet mbuf.
1413 * Walks through all segments of the given packet mbuf, and for each of them:
1414 * - Creates a new packet mbuf from the given pool.
1415 * - Attaches newly created mbuf to the segment.
1416 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
1417 * from the original packet mbuf.
1420 * The packet mbuf to be cloned.
1422 * The mempool from which the "clone" mbufs are allocated.
1424 * - The pointer to the new "clone" mbuf on success.
1425 * - NULL if allocation fails.
1427 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
1428 struct rte_mempool *mp)
1430 struct rte_mbuf *mc, *mi, **prev;
1434 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
1439 pktlen = md->pkt_len;
1444 rte_pktmbuf_attach(mi, md);
1447 } while ((md = md->next) != NULL &&
1448 (mi = rte_pktmbuf_alloc(mp)) != NULL);
1452 mc->pkt_len = pktlen;
1454 /* Allocation of new indirect segment failed */
1455 if (unlikely (mi == NULL)) {
1456 rte_pktmbuf_free(mc);
1460 __rte_mbuf_sanity_check(mc, 1);
1465 * Adds given value to the refcnt of all packet mbuf segments.
1467 * Walks through all segments of given packet mbuf and for each of them
1468 * invokes rte_mbuf_refcnt_update().
1471 * The packet mbuf whose refcnt to be updated.
1473 * The value to add to the mbuf's segments refcnt.
1475 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
1477 __rte_mbuf_sanity_check(m, 1);
1480 rte_mbuf_refcnt_update(m, v);
1481 } while ((m = m->next) != NULL);
1485 * Get the headroom in a packet mbuf.
1490 * The length of the headroom.
1492 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
1494 __rte_mbuf_sanity_check(m, 0);
1499 * Get the tailroom of a packet mbuf.
1504 * The length of the tailroom.
1506 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
1508 __rte_mbuf_sanity_check(m, 0);
1509 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
1514 * Get the last segment of the packet.
1519 * The last segment of the given mbuf.
1521 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
1523 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
1525 __rte_mbuf_sanity_check(m, 1);
1526 while (m2->next != NULL)
1532 * A macro that points to an offset into the data in the mbuf.
1534 * The returned pointer is cast to type t. Before using this
1535 * function, the user must ensure that the first segment is large
1536 * enough to accommodate its data.
1541 * The offset into the mbuf data.
1543 * The type to cast the result into.
1545 #define rte_pktmbuf_mtod_offset(m, t, o) \
1546 ((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
1549 * A macro that points to the start of the data in the mbuf.
1551 * The returned pointer is cast to type t. Before using this
1552 * function, the user must ensure that the first segment is large
1553 * enough to accommodate its data.
1558 * The type to cast the result into.
1560 #define rte_pktmbuf_mtod(m, t) rte_pktmbuf_mtod_offset(m, t, 0)
1563 * A macro that returns the physical address that points to an offset of the
1564 * start of the data in the mbuf
1569 * The offset into the data to calculate address from.
1571 #define rte_pktmbuf_mtophys_offset(m, o) \
1572 (phys_addr_t)((m)->buf_physaddr + (m)->data_off + (o))
1575 * A macro that returns the physical address that points to the start of the
1581 #define rte_pktmbuf_mtophys(m) rte_pktmbuf_mtophys_offset(m, 0)
1584 * A macro that returns the length of the packet.
1586 * The value can be read or assigned.
1591 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
1594 * A macro that returns the length of the segment.
1596 * The value can be read or assigned.
1601 #define rte_pktmbuf_data_len(m) ((m)->data_len)
1604 * Prepend len bytes to an mbuf data area.
1606 * Returns a pointer to the new
1607 * data start address. If there is not enough headroom in the first
1608 * segment, the function will return NULL, without modifying the mbuf.
1613 * The amount of data to prepend (in bytes).
1615 * A pointer to the start of the newly prepended data, or
1616 * NULL if there is not enough headroom space in the first segment
1618 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
1621 __rte_mbuf_sanity_check(m, 1);
1623 if (unlikely(len > rte_pktmbuf_headroom(m)))
1627 m->data_len = (uint16_t)(m->data_len + len);
1628 m->pkt_len = (m->pkt_len + len);
1630 return (char *)m->buf_addr + m->data_off;
1634 * Append len bytes to an mbuf.
1636 * Append len bytes to an mbuf and return a pointer to the start address
1637 * of the added data. If there is not enough tailroom in the last
1638 * segment, the function will return NULL, without modifying the mbuf.
1643 * The amount of data to append (in bytes).
1645 * A pointer to the start of the newly appended data, or
1646 * NULL if there is not enough tailroom space in the last segment
1648 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
1651 struct rte_mbuf *m_last;
1653 __rte_mbuf_sanity_check(m, 1);
1655 m_last = rte_pktmbuf_lastseg(m);
1656 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
1659 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
1660 m_last->data_len = (uint16_t)(m_last->data_len + len);
1661 m->pkt_len = (m->pkt_len + len);
1662 return (char*) tail;
1666 * Remove len bytes at the beginning of an mbuf.
1668 * Returns a pointer to the start address of the new data area. If the
1669 * length is greater than the length of the first segment, then the
1670 * function will fail and return NULL, without modifying the mbuf.
1675 * The amount of data to remove (in bytes).
1677 * A pointer to the new start of the data.
1679 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
1681 __rte_mbuf_sanity_check(m, 1);
1683 if (unlikely(len > m->data_len))
1686 m->data_len = (uint16_t)(m->data_len - len);
1688 m->pkt_len = (m->pkt_len - len);
1689 return (char *)m->buf_addr + m->data_off;
1693 * Remove len bytes of data at the end of the mbuf.
1695 * If the length is greater than the length of the last segment, the
1696 * function will fail and return -1 without modifying the mbuf.
1701 * The amount of data to remove (in bytes).
1706 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
1708 struct rte_mbuf *m_last;
1710 __rte_mbuf_sanity_check(m, 1);
1712 m_last = rte_pktmbuf_lastseg(m);
1713 if (unlikely(len > m_last->data_len))
1716 m_last->data_len = (uint16_t)(m_last->data_len - len);
1717 m->pkt_len = (m->pkt_len - len);
1722 * Test if mbuf data is contiguous.
1727 * - 1, if all data is contiguous (one segment).
1728 * - 0, if there is several segments.
1730 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
1732 __rte_mbuf_sanity_check(m, 1);
1733 return !!(m->nb_segs == 1);
1737 * @internal used by rte_pktmbuf_read().
1739 const void *__rte_pktmbuf_read(const struct rte_mbuf *m, uint32_t off,
1740 uint32_t len, void *buf);
1743 * Read len data bytes in a mbuf at specified offset.
1745 * If the data is contiguous, return the pointer in the mbuf data, else
1746 * copy the data in the buffer provided by the user and return its
1750 * The pointer to the mbuf.
1752 * The offset of the data in the mbuf.
1754 * The amount of bytes to read.
1756 * The buffer where data is copied if it is not contigous in mbuf
1757 * data. Its length should be at least equal to the len parameter.
1759 * The pointer to the data, either in the mbuf if it is contiguous,
1760 * or in the user buffer. If mbuf is too small, NULL is returned.
1762 static inline const void *rte_pktmbuf_read(const struct rte_mbuf *m,
1763 uint32_t off, uint32_t len, void *buf)
1765 if (likely(off + len <= rte_pktmbuf_data_len(m)))
1766 return rte_pktmbuf_mtod_offset(m, char *, off);
1768 return __rte_pktmbuf_read(m, off, len, buf);
1772 * Chain an mbuf to another, thereby creating a segmented packet.
1774 * Note: The implementation will do a linear walk over the segments to find
1775 * the tail entry. For cases when there are many segments, it's better to
1776 * chain the entries manually.
1779 * The head of the mbuf chain (the first packet)
1781 * The mbuf to put last in the chain
1785 * - -EOVERFLOW, if the chain is full (256 entries)
1787 static inline int rte_pktmbuf_chain(struct rte_mbuf *head, struct rte_mbuf *tail)
1789 struct rte_mbuf *cur_tail;
1791 /* Check for number-of-segments-overflow */
1792 if (head->nb_segs + tail->nb_segs >= 1 << (sizeof(head->nb_segs) * 8))
1795 /* Chain 'tail' onto the old tail */
1796 cur_tail = rte_pktmbuf_lastseg(head);
1797 cur_tail->next = tail;
1799 /* accumulate number of segments and total length. */
1800 head->nb_segs = (uint8_t)(head->nb_segs + tail->nb_segs);
1801 head->pkt_len += tail->pkt_len;
1803 /* pkt_len is only set in the head */
1804 tail->pkt_len = tail->data_len;
1810 * Validate general requirements for Tx offload in mbuf.
1812 * This function checks correctness and completeness of Tx offload settings.
1815 * The packet mbuf to be validated.
1817 * 0 if packet is valid
1820 rte_validate_tx_offload(const struct rte_mbuf *m)
1822 uint64_t ol_flags = m->ol_flags;
1823 uint64_t inner_l3_offset = m->l2_len;
1825 /* Does packet set any of available offloads? */
1826 if (!(ol_flags & PKT_TX_OFFLOAD_MASK))
1829 if (ol_flags & PKT_TX_OUTER_IP_CKSUM)
1830 inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
1832 /* Headers are fragmented */
1833 if (rte_pktmbuf_data_len(m) < inner_l3_offset + m->l3_len + m->l4_len)
1836 /* IP checksum can be counted only for IPv4 packet */
1837 if ((ol_flags & PKT_TX_IP_CKSUM) && (ol_flags & PKT_TX_IPV6))
1840 /* IP type not set when required */
1841 if (ol_flags & (PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
1842 if (!(ol_flags & (PKT_TX_IPV4 | PKT_TX_IPV6)))
1845 /* Check requirements for TSO packet */
1846 if (ol_flags & PKT_TX_TCP_SEG)
1847 if ((m->tso_segsz == 0) ||
1848 ((ol_flags & PKT_TX_IPV4) &&
1849 !(ol_flags & PKT_TX_IP_CKSUM)))
1852 /* PKT_TX_OUTER_IP_CKSUM set for non outer IPv4 packet. */
1853 if ((ol_flags & PKT_TX_OUTER_IP_CKSUM) &&
1854 !(ol_flags & PKT_TX_OUTER_IPV4))
1861 * Linearize data in mbuf.
1863 * This function moves the mbuf data in the first segment if there is enough
1864 * tailroom. The subsequent segments are unchained and freed.
1873 rte_pktmbuf_linearize(struct rte_mbuf *mbuf)
1875 int seg_len, copy_len;
1877 struct rte_mbuf *m_next;
1880 if (rte_pktmbuf_is_contiguous(mbuf))
1883 /* Extend first segment to the total packet length */
1884 copy_len = rte_pktmbuf_pkt_len(mbuf) - rte_pktmbuf_data_len(mbuf);
1886 if (unlikely(copy_len > rte_pktmbuf_tailroom(mbuf)))
1889 buffer = rte_pktmbuf_mtod_offset(mbuf, char *, mbuf->data_len);
1890 mbuf->data_len = (uint16_t)(mbuf->pkt_len);
1892 /* Append data from next segments to the first one */
1897 seg_len = rte_pktmbuf_data_len(m);
1898 rte_memcpy(buffer, rte_pktmbuf_mtod(m, char *), seg_len);
1901 rte_pktmbuf_free_seg(m);
1912 * Dump an mbuf structure to a file.
1914 * Dump all fields for the given packet mbuf and all its associated
1915 * segments (in the case of a chained buffer).
1918 * A pointer to a file for output
1922 * If dump_len != 0, also dump the "dump_len" first data bytes of
1925 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1931 #endif /* _RTE_MBUF_H_ */