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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)
187 /* add new RX flags here */
189 /* add new TX flags here */
192 * Offload the MACsec. This flag must be set by the application to enable
193 * this offload feature for a packet to be transmitted.
195 #define PKT_TX_MACSEC (1ULL << 44)
198 * Bits 45:48 used for the tunnel type.
199 * When doing Tx offload like TSO or checksum, the HW needs to configure the
200 * tunnel type into the HW descriptors.
202 #define PKT_TX_TUNNEL_VXLAN (0x1ULL << 45)
203 #define PKT_TX_TUNNEL_GRE (0x2ULL << 45)
204 #define PKT_TX_TUNNEL_IPIP (0x3ULL << 45)
205 #define PKT_TX_TUNNEL_GENEVE (0x4ULL << 45)
206 /* add new TX TUNNEL type here */
207 #define PKT_TX_TUNNEL_MASK (0xFULL << 45)
210 * Second VLAN insertion (QinQ) flag.
212 #define PKT_TX_QINQ_PKT (1ULL << 49) /**< TX packet with double VLAN inserted. */
215 * TCP segmentation offload. To enable this offload feature for a
216 * packet to be transmitted on hardware supporting TSO:
217 * - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
219 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
220 * - if it's IPv4, set the PKT_TX_IP_CKSUM flag and write the IP checksum
222 * - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
223 * - calculate the pseudo header checksum without taking ip_len in account,
224 * and set it in the TCP header. Refer to rte_ipv4_phdr_cksum() and
225 * rte_ipv6_phdr_cksum() that can be used as helpers.
227 #define PKT_TX_TCP_SEG (1ULL << 50)
229 #define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
232 * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
233 * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
234 * L4 checksum offload, the user needs to:
235 * - fill l2_len and l3_len in mbuf
236 * - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
237 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
238 * - calculate the pseudo header checksum and set it in the L4 header (only
239 * for TCP or UDP). See rte_ipv4_phdr_cksum() and rte_ipv6_phdr_cksum().
240 * For SCTP, set the crc field to 0.
242 #define PKT_TX_L4_NO_CKSUM (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
243 #define PKT_TX_TCP_CKSUM (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */
244 #define PKT_TX_SCTP_CKSUM (2ULL << 52) /**< SCTP cksum of TX pkt. computed by NIC. */
245 #define PKT_TX_UDP_CKSUM (3ULL << 52) /**< UDP cksum of TX pkt. computed by NIC. */
246 #define PKT_TX_L4_MASK (3ULL << 52) /**< Mask for L4 cksum offload request. */
249 * Offload the IP checksum in the hardware. The flag PKT_TX_IPV4 should
250 * also be set by the application, although a PMD will only check
252 * - set the IP checksum field in the packet to 0
253 * - fill the mbuf offload information: l2_len, l3_len
255 #define PKT_TX_IP_CKSUM (1ULL << 54)
258 * Packet is IPv4. This flag must be set when using any offload feature
259 * (TSO, L3 or L4 checksum) to tell the NIC that the packet is an IPv4
260 * packet. If the packet is a tunneled packet, this flag is related to
263 #define PKT_TX_IPV4 (1ULL << 55)
266 * Packet is IPv6. This flag must be set when using an offload feature
267 * (TSO or L4 checksum) to tell the NIC that the packet is an IPv6
268 * packet. If the packet is a tunneled packet, this flag is related to
271 #define PKT_TX_IPV6 (1ULL << 56)
273 #define PKT_TX_VLAN_PKT (1ULL << 57) /**< TX packet is a 802.1q VLAN packet. */
276 * Offload the IP checksum of an external header in the hardware. The
277 * flag PKT_TX_OUTER_IPV4 should also be set by the application, alto ugh
278 * a PMD will only check PKT_TX_IP_CKSUM. The IP checksum field in the
279 * packet must be set to 0.
280 * - set the outer IP checksum field in the packet to 0
281 * - fill the mbuf offload information: outer_l2_len, outer_l3_len
283 #define PKT_TX_OUTER_IP_CKSUM (1ULL << 58)
286 * Packet outer header is IPv4. This flag must be set when using any
287 * outer offload feature (L3 or L4 checksum) to tell the NIC that the
288 * outer header of the tunneled packet is an IPv4 packet.
290 #define PKT_TX_OUTER_IPV4 (1ULL << 59)
293 * Packet outer header is IPv6. This flag must be set when using any
294 * outer offload feature (L4 checksum) to tell the NIC that the outer
295 * header of the tunneled packet is an IPv6 packet.
297 #define PKT_TX_OUTER_IPV6 (1ULL << 60)
300 * Bitmask of all supported packet Tx offload features flags,
301 * which can be set for packet.
303 #define PKT_TX_OFFLOAD_MASK ( \
306 PKT_TX_OUTER_IP_CKSUM | \
308 PKT_TX_IEEE1588_TMST | \
311 PKT_TX_TUNNEL_MASK | \
314 #define __RESERVED (1ULL << 61) /**< reserved for future mbuf use */
316 #define IND_ATTACHED_MBUF (1ULL << 62) /**< Indirect attached mbuf */
318 /* Use final bit of flags to indicate a control mbuf */
319 #define CTRL_MBUF_FLAG (1ULL << 63) /**< Mbuf contains control data */
321 /** Alignment constraint of mbuf private area. */
322 #define RTE_MBUF_PRIV_ALIGN 8
325 * Get the name of a RX offload flag
328 * The mask describing the flag.
330 * The name of this flag, or NULL if it's not a valid RX flag.
332 const char *rte_get_rx_ol_flag_name(uint64_t mask);
335 * Dump the list of RX offload flags in a buffer
338 * The mask describing the RX flags.
342 * The length of the buffer.
344 * 0 on success, (-1) on error.
346 int rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
349 * Get the name of a TX offload flag
352 * The mask describing the flag. Usually only one bit must be set.
353 * Several bits can be given if they belong to the same mask.
354 * Ex: PKT_TX_L4_MASK.
356 * The name of this flag, or NULL if it's not a valid TX flag.
358 const char *rte_get_tx_ol_flag_name(uint64_t mask);
361 * Dump the list of TX offload flags in a buffer
364 * The mask describing the TX flags.
368 * The length of the buffer.
370 * 0 on success, (-1) on error.
372 int rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
375 * Some NICs need at least 2KB buffer to RX standard Ethernet frame without
376 * splitting it into multiple segments.
377 * So, for mbufs that planned to be involved into RX/TX, the recommended
378 * minimal buffer length is 2KB + RTE_PKTMBUF_HEADROOM.
380 #define RTE_MBUF_DEFAULT_DATAROOM 2048
381 #define RTE_MBUF_DEFAULT_BUF_SIZE \
382 (RTE_MBUF_DEFAULT_DATAROOM + RTE_PKTMBUF_HEADROOM)
384 /* define a set of marker types that can be used to refer to set points in the
387 typedef void *MARKER[0]; /**< generic marker for a point in a structure */
389 typedef uint8_t MARKER8[0]; /**< generic marker with 1B alignment */
391 typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
392 * with a single assignment */
395 * The generic rte_mbuf, containing a packet mbuf.
400 void *buf_addr; /**< Virtual address of segment buffer. */
401 phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
403 /* next 8 bytes are initialised on RX descriptor rearm */
408 * Reference counter. Its size should at least equal to the size
409 * of port field (16 bits), to support zero-copy broadcast.
410 * It should only be accessed using the following functions:
411 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
412 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
413 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
418 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
419 uint16_t refcnt; /**< Non-atomically accessed refcnt */
421 uint16_t nb_segs; /**< Number of segments. */
423 /** Input port (16 bits to support more than 256 virtual ports). */
426 uint64_t ol_flags; /**< Offload features. */
428 /* remaining bytes are set on RX when pulling packet from descriptor */
429 MARKER rx_descriptor_fields1;
432 * The packet type, which is the combination of outer/inner L2, L3, L4
433 * and tunnel types. The packet_type is about data really present in the
434 * mbuf. Example: if vlan stripping is enabled, a received vlan packet
435 * would have RTE_PTYPE_L2_ETHER and not RTE_PTYPE_L2_VLAN because the
436 * vlan is stripped from the data.
440 uint32_t packet_type; /**< L2/L3/L4 and tunnel information. */
442 uint32_t l2_type:4; /**< (Outer) L2 type. */
443 uint32_t l3_type:4; /**< (Outer) L3 type. */
444 uint32_t l4_type:4; /**< (Outer) L4 type. */
445 uint32_t tun_type:4; /**< Tunnel type. */
446 uint32_t inner_l2_type:4; /**< Inner L2 type. */
447 uint32_t inner_l3_type:4; /**< Inner L3 type. */
448 uint32_t inner_l4_type:4; /**< Inner L4 type. */
452 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
453 uint16_t data_len; /**< Amount of data in segment buffer. */
454 /** VLAN TCI (CPU order), valid if PKT_RX_VLAN_STRIPPED is set. */
458 uint32_t rss; /**< RSS hash result if RSS enabled */
467 /**< Second 4 flexible bytes */
470 /**< First 4 flexible bytes or FD ID, dependent on
471 PKT_RX_FDIR_* flag in ol_flags. */
472 } fdir; /**< Filter identifier if FDIR enabled */
476 } sched; /**< Hierarchical scheduler */
477 uint32_t usr; /**< User defined tags. See rte_distributor_process() */
478 } hash; /**< hash information */
480 /** Outer VLAN TCI (CPU order), valid if PKT_RX_QINQ_STRIPPED is set. */
481 uint16_t vlan_tci_outer;
483 uint16_t buf_len; /**< Length of segment buffer. */
484 /* second cache line - fields only used in slow path or on TX */
485 MARKER cacheline1 __rte_cache_min_aligned;
489 void *userdata; /**< Can be used for external metadata */
490 uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
493 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
494 struct rte_mbuf *next; /**< Next segment of scattered packet. */
496 /* fields to support TX offloads */
499 uint64_t tx_offload; /**< combined for easy fetch */
503 /**< L2 (MAC) Header Length for non-tunneling pkt.
504 * Outer_L4_len + ... + Inner_L2_len for tunneling pkt.
506 uint64_t l3_len:9; /**< L3 (IP) Header Length. */
507 uint64_t l4_len:8; /**< L4 (TCP/UDP) Header Length. */
508 uint64_t tso_segsz:16; /**< TCP TSO segment size */
510 /* fields for TX offloading of tunnels */
511 uint64_t outer_l3_len:9; /**< Outer L3 (IP) Hdr Length. */
512 uint64_t outer_l2_len:7; /**< Outer L2 (MAC) Hdr Length. */
514 /* uint64_t unused:8; */
518 /** Size of the application private data. In case of an indirect
519 * mbuf, it stores the direct mbuf private data size. */
522 /** Timesync flags for use with IEEE1588. */
525 /** Sequence number. See also rte_reorder_insert(). */
528 } __rte_cache_aligned;
531 * Prefetch the first part of the mbuf
533 * The first 64 bytes of the mbuf corresponds to fields that are used early
534 * in the receive path. If the cache line of the architecture is higher than
535 * 64B, the second part will also be prefetched.
538 * The pointer to the mbuf.
541 rte_mbuf_prefetch_part1(struct rte_mbuf *m)
543 rte_prefetch0(&m->cacheline0);
547 * Prefetch the second part of the mbuf
549 * The next 64 bytes of the mbuf corresponds to fields that are used in the
550 * transmit path. If the cache line of the architecture is higher than 64B,
551 * this function does nothing as it is expected that the full mbuf is
555 * The pointer to the mbuf.
558 rte_mbuf_prefetch_part2(struct rte_mbuf *m)
560 #if RTE_CACHE_LINE_SIZE == 64
561 rte_prefetch0(&m->cacheline1);
568 static inline uint16_t rte_pktmbuf_priv_size(struct rte_mempool *mp);
571 * Return the DMA address of the beginning of the mbuf data
574 * The pointer to the mbuf.
576 * The physical address of the beginning of the mbuf data
578 static inline phys_addr_t
579 rte_mbuf_data_dma_addr(const struct rte_mbuf *mb)
581 return mb->buf_physaddr + mb->data_off;
585 * Return the default DMA address of the beginning of the mbuf data
587 * This function is used by drivers in their receive function, as it
588 * returns the location where data should be written by the NIC, taking
589 * the default headroom in account.
592 * The pointer to the mbuf.
594 * The physical address of the beginning of the mbuf data
596 static inline phys_addr_t
597 rte_mbuf_data_dma_addr_default(const struct rte_mbuf *mb)
599 return mb->buf_physaddr + RTE_PKTMBUF_HEADROOM;
603 * Return the mbuf owning the data buffer address of an indirect mbuf.
606 * The pointer to the indirect mbuf.
608 * The address of the direct mbuf corresponding to buffer_addr.
610 static inline struct rte_mbuf *
611 rte_mbuf_from_indirect(struct rte_mbuf *mi)
613 return (struct rte_mbuf *)RTE_PTR_SUB(mi->buf_addr, sizeof(*mi) + mi->priv_size);
617 * Return the buffer address embedded in the given mbuf.
620 * The pointer to the mbuf.
622 * The address of the data buffer owned by the mbuf.
625 rte_mbuf_to_baddr(struct rte_mbuf *md)
628 buffer_addr = (char *)md + sizeof(*md) + rte_pktmbuf_priv_size(md->pool);
633 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
635 #define RTE_MBUF_INDIRECT(mb) ((mb)->ol_flags & IND_ATTACHED_MBUF)
638 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
640 #define RTE_MBUF_DIRECT(mb) (!RTE_MBUF_INDIRECT(mb))
643 * Private data in case of pktmbuf pool.
645 * A structure that contains some pktmbuf_pool-specific data that are
646 * appended after the mempool structure (in private data).
648 struct rte_pktmbuf_pool_private {
649 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf. */
650 uint16_t mbuf_priv_size; /**< Size of private area in each mbuf. */
653 #ifdef RTE_LIBRTE_MBUF_DEBUG
655 /** check mbuf type in debug mode */
656 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
658 #else /* RTE_LIBRTE_MBUF_DEBUG */
660 /** check mbuf type in debug mode */
661 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
663 #endif /* RTE_LIBRTE_MBUF_DEBUG */
665 #ifdef RTE_MBUF_REFCNT_ATOMIC
668 * Reads the value of an mbuf's refcnt.
672 * Reference count number.
674 static inline uint16_t
675 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
677 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
681 * Sets an mbuf's refcnt to a defined value.
688 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
690 rte_atomic16_set(&m->refcnt_atomic, new_value);
694 * Adds given value to an mbuf's refcnt and returns its new value.
698 * Value to add/subtract
702 static inline uint16_t
703 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
706 * The atomic_add is an expensive operation, so we don't want to
707 * call it in the case where we know we are the uniq holder of
708 * this mbuf (i.e. ref_cnt == 1). Otherwise, an atomic
709 * operation has to be used because concurrent accesses on the
710 * reference counter can occur.
712 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
713 rte_mbuf_refcnt_set(m, 1 + value);
717 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
720 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
723 * Adds given value to an mbuf's refcnt and returns its new value.
725 static inline uint16_t
726 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
728 m->refcnt = (uint16_t)(m->refcnt + value);
733 * Reads the value of an mbuf's refcnt.
735 static inline uint16_t
736 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
742 * Sets an mbuf's refcnt to the defined value.
745 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
747 m->refcnt = new_value;
750 #endif /* RTE_MBUF_REFCNT_ATOMIC */
753 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
760 * Sanity checks on an mbuf.
762 * Check the consistency of the given mbuf. The function will cause a
763 * panic if corruption is detected.
766 * The mbuf to be checked.
768 * True if the mbuf is a packet header, false if it is a sub-segment
769 * of a packet (in this case, some fields like nb_segs are not checked)
772 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
775 * Allocate an unitialized mbuf from mempool *mp*.
777 * This function can be used by PMDs (especially in RX functions) to
778 * allocate an unitialized mbuf. The driver is responsible of
779 * initializing all the required fields. See rte_pktmbuf_reset().
780 * For standard needs, prefer rte_pktmbuf_alloc().
782 * The caller can expect that the following fields of the mbuf structure
783 * are initialized: buf_addr, buf_physaddr, buf_len, refcnt=1, nb_segs=1,
784 * next=NULL, pool, priv_size. The other fields must be initialized
788 * The mempool from which mbuf is allocated.
790 * - The pointer to the new mbuf on success.
791 * - NULL if allocation failed.
793 static inline struct rte_mbuf *rte_mbuf_raw_alloc(struct rte_mempool *mp)
798 if (rte_mempool_get(mp, &mb) < 0)
800 m = (struct rte_mbuf *)mb;
801 RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1);
802 RTE_ASSERT(m->next == NULL);
803 RTE_ASSERT(m->nb_segs == 1);
804 __rte_mbuf_sanity_check(m, 0);
810 * Put mbuf back into its original mempool.
812 * The caller must ensure that the mbuf is direct and properly
813 * reinitialized (refcnt=1, next=NULL, nb_segs=1), as done by
814 * rte_pktmbuf_prefree_seg().
816 * This function should be used with care, when optimization is
817 * required. For standard needs, prefer rte_pktmbuf_free() or
818 * rte_pktmbuf_free_seg().
821 * The mbuf to be freed.
823 static inline void __attribute__((always_inline))
824 rte_mbuf_raw_free(struct rte_mbuf *m)
826 RTE_ASSERT(RTE_MBUF_DIRECT(m));
827 RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1);
828 RTE_ASSERT(m->next == NULL);
829 RTE_ASSERT(m->nb_segs == 1);
830 __rte_mbuf_sanity_check(m, 0);
831 rte_mempool_put(m->pool, m);
834 /* compat with older versions */
837 __rte_mbuf_raw_free(struct rte_mbuf *m)
839 rte_mbuf_raw_free(m);
842 /* Operations on ctrl mbuf */
845 * The control mbuf constructor.
847 * This function initializes some fields in an mbuf structure that are
848 * not modified by the user once created (mbuf type, origin pool, buffer
849 * start address, and so on). This function is given as a callback function
850 * to rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
853 * The mempool from which the mbuf is allocated.
855 * A pointer that can be used by the user to retrieve useful information
856 * for mbuf initialization. This pointer is the opaque argument passed to
857 * rte_mempool_obj_iter() or rte_mempool_create().
859 * The mbuf to initialize.
861 * The index of the mbuf in the pool table.
863 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
864 void *m, unsigned i);
867 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
869 * This new mbuf is initialized with data pointing to the beginning of
870 * buffer, and with a length of zero.
873 * The mempool from which the mbuf is allocated.
875 * - The pointer to the new mbuf on success.
876 * - NULL if allocation failed.
878 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
881 * Free a control mbuf back into its original mempool.
884 * The control mbuf to be freed.
886 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
889 * A macro that returns the pointer to the carried data.
891 * The value that can be read or assigned.
896 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
899 * A macro that returns the length of the carried data.
901 * The value that can be read or assigned.
906 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
909 * Tests if an mbuf is a control mbuf
912 * The mbuf to be tested
914 * - True (1) if the mbuf is a control mbuf
915 * - False(0) otherwise
918 rte_is_ctrlmbuf(struct rte_mbuf *m)
920 return !!(m->ol_flags & CTRL_MBUF_FLAG);
923 /* Operations on pkt mbuf */
926 * The packet mbuf constructor.
928 * This function initializes some fields in the mbuf structure that are
929 * not modified by the user once created (origin pool, buffer start
930 * address, and so on). This function is given as a callback function to
931 * rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
934 * The mempool from which mbufs originate.
936 * A pointer that can be used by the user to retrieve useful information
937 * for mbuf initialization. This pointer is the opaque argument passed to
938 * rte_mempool_obj_iter() or rte_mempool_create().
940 * The mbuf to initialize.
942 * The index of the mbuf in the pool table.
944 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
945 void *m, unsigned i);
949 * A packet mbuf pool constructor.
951 * This function initializes the mempool private data in the case of a
952 * pktmbuf pool. This private data is needed by the driver. The
953 * function must be called on the mempool before it is used, or it
954 * can be given as a callback function to rte_mempool_create() at
955 * pool creation. It can be extended by the user, for example, to
956 * provide another packet size.
959 * The mempool from which mbufs originate.
961 * A pointer that can be used by the user to retrieve useful information
962 * for mbuf initialization. This pointer is the opaque argument passed to
963 * rte_mempool_create().
965 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
968 * Create a mbuf pool.
970 * This function creates and initializes a packet mbuf pool. It is
971 * a wrapper to rte_mempool functions.
974 * The name of the mbuf pool.
976 * The number of elements in the mbuf pool. The optimum size (in terms
977 * of memory usage) for a mempool is when n is a power of two minus one:
980 * Size of the per-core object cache. See rte_mempool_create() for
983 * Size of application private are between the rte_mbuf structure
984 * and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
985 * @param data_room_size
986 * Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
988 * The socket identifier where the memory should be allocated. The
989 * value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
992 * The pointer to the new allocated mempool, on success. NULL on error
993 * with rte_errno set appropriately. Possible rte_errno values include:
994 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
995 * - E_RTE_SECONDARY - function was called from a secondary process instance
996 * - EINVAL - cache size provided is too large, or priv_size is not aligned.
997 * - ENOSPC - the maximum number of memzones has already been allocated
998 * - EEXIST - a memzone with the same name already exists
999 * - ENOMEM - no appropriate memory area found in which to create memzone
1001 struct rte_mempool *
1002 rte_pktmbuf_pool_create(const char *name, unsigned n,
1003 unsigned cache_size, uint16_t priv_size, uint16_t data_room_size,
1007 * Get the data room size of mbufs stored in a pktmbuf_pool
1009 * The data room size is the amount of data that can be stored in a
1010 * mbuf including the headroom (RTE_PKTMBUF_HEADROOM).
1013 * The packet mbuf pool.
1015 * The data room size of mbufs stored in this mempool.
1017 static inline uint16_t
1018 rte_pktmbuf_data_room_size(struct rte_mempool *mp)
1020 struct rte_pktmbuf_pool_private *mbp_priv;
1022 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1023 return mbp_priv->mbuf_data_room_size;
1027 * Get the application private size of mbufs stored in a pktmbuf_pool
1029 * The private size of mbuf is a zone located between the rte_mbuf
1030 * structure and the data buffer where an application can store data
1031 * associated to a packet.
1034 * The packet mbuf pool.
1036 * The private size of mbufs stored in this mempool.
1038 static inline uint16_t
1039 rte_pktmbuf_priv_size(struct rte_mempool *mp)
1041 struct rte_pktmbuf_pool_private *mbp_priv;
1043 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1044 return mbp_priv->mbuf_priv_size;
1048 * Reset the data_off field of a packet mbuf to its default value.
1050 * The given mbuf must have only one segment, which should be empty.
1053 * The packet mbuf's data_off field has to be reset.
1055 static inline void rte_pktmbuf_reset_headroom(struct rte_mbuf *m)
1057 m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM, (uint16_t)m->buf_len);
1061 * Reset the fields of a packet mbuf to their default values.
1063 * The given mbuf must have only one segment.
1066 * The packet mbuf to be resetted.
1068 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
1074 m->vlan_tci_outer = 0;
1080 rte_pktmbuf_reset_headroom(m);
1083 __rte_mbuf_sanity_check(m, 1);
1087 * Allocate a new mbuf from a mempool.
1089 * This new mbuf contains one segment, which has a length of 0. The pointer
1090 * to data is initialized to have some bytes of headroom in the buffer
1091 * (if buffer size allows).
1094 * The mempool from which the mbuf is allocated.
1096 * - The pointer to the new mbuf on success.
1097 * - NULL if allocation failed.
1099 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
1102 if ((m = rte_mbuf_raw_alloc(mp)) != NULL)
1103 rte_pktmbuf_reset(m);
1108 * Allocate a bulk of mbufs, initialize refcnt and reset the fields to default
1112 * The mempool from which mbufs are allocated.
1114 * Array of pointers to mbufs
1120 static inline int rte_pktmbuf_alloc_bulk(struct rte_mempool *pool,
1121 struct rte_mbuf **mbufs, unsigned count)
1126 rc = rte_mempool_get_bulk(pool, (void **)mbufs, count);
1130 /* To understand duff's device on loop unwinding optimization, see
1131 * https://en.wikipedia.org/wiki/Duff's_device.
1132 * Here while() loop is used rather than do() while{} to avoid extra
1133 * check if count is zero.
1135 switch (count % 4) {
1137 while (idx != count) {
1138 RTE_ASSERT(rte_mbuf_refcnt_read(mbufs[idx]) == 0);
1139 rte_mbuf_refcnt_set(mbufs[idx], 1);
1140 rte_pktmbuf_reset(mbufs[idx]);
1143 RTE_ASSERT(rte_mbuf_refcnt_read(mbufs[idx]) == 0);
1144 rte_mbuf_refcnt_set(mbufs[idx], 1);
1145 rte_pktmbuf_reset(mbufs[idx]);
1148 RTE_ASSERT(rte_mbuf_refcnt_read(mbufs[idx]) == 0);
1149 rte_mbuf_refcnt_set(mbufs[idx], 1);
1150 rte_pktmbuf_reset(mbufs[idx]);
1153 RTE_ASSERT(rte_mbuf_refcnt_read(mbufs[idx]) == 0);
1154 rte_mbuf_refcnt_set(mbufs[idx], 1);
1155 rte_pktmbuf_reset(mbufs[idx]);
1163 * Attach packet mbuf to another packet mbuf.
1165 * After attachment we refer the mbuf we attached as 'indirect',
1166 * while mbuf we attached to as 'direct'.
1167 * The direct mbuf's reference counter is incremented.
1169 * Right now, not supported:
1170 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
1171 * - mbuf we trying to attach (mi) is used by someone else
1172 * e.g. it's reference counter is greater then 1.
1175 * The indirect packet mbuf.
1177 * The packet mbuf we're attaching to.
1179 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m)
1181 struct rte_mbuf *md;
1183 RTE_ASSERT(RTE_MBUF_DIRECT(mi) &&
1184 rte_mbuf_refcnt_read(mi) == 1);
1186 /* if m is not direct, get the mbuf that embeds the data */
1187 if (RTE_MBUF_DIRECT(m))
1190 md = rte_mbuf_from_indirect(m);
1192 rte_mbuf_refcnt_update(md, 1);
1193 mi->priv_size = m->priv_size;
1194 mi->buf_physaddr = m->buf_physaddr;
1195 mi->buf_addr = m->buf_addr;
1196 mi->buf_len = m->buf_len;
1198 mi->data_off = m->data_off;
1199 mi->data_len = m->data_len;
1201 mi->vlan_tci = m->vlan_tci;
1202 mi->vlan_tci_outer = m->vlan_tci_outer;
1203 mi->tx_offload = m->tx_offload;
1207 mi->pkt_len = mi->data_len;
1209 mi->ol_flags = m->ol_flags | IND_ATTACHED_MBUF;
1210 mi->packet_type = m->packet_type;
1212 __rte_mbuf_sanity_check(mi, 1);
1213 __rte_mbuf_sanity_check(m, 0);
1217 * Detach an indirect packet mbuf.
1219 * - restore original mbuf address and length values.
1220 * - reset pktmbuf data and data_len to their default values.
1221 * - decrement the direct mbuf's reference counter. When the
1222 * reference counter becomes 0, the direct mbuf is freed.
1224 * All other fields of the given packet mbuf will be left intact.
1227 * The indirect attached packet mbuf.
1229 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
1231 struct rte_mbuf *md = rte_mbuf_from_indirect(m);
1232 struct rte_mempool *mp = m->pool;
1233 uint32_t mbuf_size, buf_len, priv_size;
1235 priv_size = rte_pktmbuf_priv_size(mp);
1236 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
1237 buf_len = rte_pktmbuf_data_room_size(mp);
1239 m->priv_size = priv_size;
1240 m->buf_addr = (char *)m + mbuf_size;
1241 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + mbuf_size;
1242 m->buf_len = (uint16_t)buf_len;
1243 rte_pktmbuf_reset_headroom(m);
1247 if (rte_mbuf_refcnt_update(md, -1) == 0) {
1250 rte_mbuf_refcnt_set(md, 1);
1251 rte_mbuf_raw_free(md);
1256 * Decrease reference counter and unlink a mbuf segment
1258 * This function does the same than a free, except that it does not
1259 * return the segment to its pool.
1260 * It decreases the reference counter, and if it reaches 0, it is
1261 * detached from its parent for an indirect mbuf.
1264 * The mbuf to be unlinked
1266 * - (m) if it is the last reference. It can be recycled or freed.
1267 * - (NULL) if the mbuf still has remaining references on it.
1269 __attribute__((always_inline))
1270 static inline struct rte_mbuf *
1271 rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1273 __rte_mbuf_sanity_check(m, 0);
1275 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
1277 if (RTE_MBUF_INDIRECT(m))
1278 rte_pktmbuf_detach(m);
1280 if (m->next != NULL) {
1287 } else if (rte_atomic16_add_return(&m->refcnt_atomic, -1) == 0) {
1290 if (RTE_MBUF_INDIRECT(m))
1291 rte_pktmbuf_detach(m);
1293 if (m->next != NULL) {
1297 rte_mbuf_refcnt_set(m, 1);
1304 /* deprecated, replaced by rte_pktmbuf_prefree_seg() */
1306 static inline struct rte_mbuf *
1307 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1309 return rte_pktmbuf_prefree_seg(m);
1313 * Free a segment of a packet mbuf into its original mempool.
1315 * Free an mbuf, without parsing other segments in case of chained
1319 * The packet mbuf segment to be freed.
1321 static inline void __attribute__((always_inline))
1322 rte_pktmbuf_free_seg(struct rte_mbuf *m)
1324 m = rte_pktmbuf_prefree_seg(m);
1325 if (likely(m != NULL))
1326 rte_mbuf_raw_free(m);
1330 * Free a packet mbuf back into its original mempool.
1332 * Free an mbuf, and all its segments in case of chained buffers. Each
1333 * segment is added back into its original mempool.
1336 * The packet mbuf to be freed.
1338 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
1340 struct rte_mbuf *m_next;
1342 __rte_mbuf_sanity_check(m, 1);
1346 rte_pktmbuf_free_seg(m);
1352 * Creates a "clone" of the given packet mbuf.
1354 * Walks through all segments of the given packet mbuf, and for each of them:
1355 * - Creates a new packet mbuf from the given pool.
1356 * - Attaches newly created mbuf to the segment.
1357 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
1358 * from the original packet mbuf.
1361 * The packet mbuf to be cloned.
1363 * The mempool from which the "clone" mbufs are allocated.
1365 * - The pointer to the new "clone" mbuf on success.
1366 * - NULL if allocation fails.
1368 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
1369 struct rte_mempool *mp)
1371 struct rte_mbuf *mc, *mi, **prev;
1375 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
1380 pktlen = md->pkt_len;
1385 rte_pktmbuf_attach(mi, md);
1388 } while ((md = md->next) != NULL &&
1389 (mi = rte_pktmbuf_alloc(mp)) != NULL);
1393 mc->pkt_len = pktlen;
1395 /* Allocation of new indirect segment failed */
1396 if (unlikely (mi == NULL)) {
1397 rte_pktmbuf_free(mc);
1401 __rte_mbuf_sanity_check(mc, 1);
1406 * Adds given value to the refcnt of all packet mbuf segments.
1408 * Walks through all segments of given packet mbuf and for each of them
1409 * invokes rte_mbuf_refcnt_update().
1412 * The packet mbuf whose refcnt to be updated.
1414 * The value to add to the mbuf's segments refcnt.
1416 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
1418 __rte_mbuf_sanity_check(m, 1);
1421 rte_mbuf_refcnt_update(m, v);
1422 } while ((m = m->next) != NULL);
1426 * Get the headroom in a packet mbuf.
1431 * The length of the headroom.
1433 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
1435 __rte_mbuf_sanity_check(m, 1);
1440 * Get the tailroom of a packet mbuf.
1445 * The length of the tailroom.
1447 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
1449 __rte_mbuf_sanity_check(m, 1);
1450 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
1455 * Get the last segment of the packet.
1460 * The last segment of the given mbuf.
1462 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
1464 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
1466 __rte_mbuf_sanity_check(m, 1);
1467 while (m2->next != NULL)
1473 * A macro that points to an offset into the data in the mbuf.
1475 * The returned pointer is cast to type t. Before using this
1476 * function, the user must ensure that the first segment is large
1477 * enough to accommodate its data.
1482 * The offset into the mbuf data.
1484 * The type to cast the result into.
1486 #define rte_pktmbuf_mtod_offset(m, t, o) \
1487 ((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
1490 * A macro that points to the start of the data in the mbuf.
1492 * The returned pointer is cast to type t. Before using this
1493 * function, the user must ensure that the first segment is large
1494 * enough to accommodate its data.
1499 * The type to cast the result into.
1501 #define rte_pktmbuf_mtod(m, t) rte_pktmbuf_mtod_offset(m, t, 0)
1504 * A macro that returns the physical address that points to an offset of the
1505 * start of the data in the mbuf
1510 * The offset into the data to calculate address from.
1512 #define rte_pktmbuf_mtophys_offset(m, o) \
1513 (phys_addr_t)((m)->buf_physaddr + (m)->data_off + (o))
1516 * A macro that returns the physical address that points to the start of the
1522 #define rte_pktmbuf_mtophys(m) rte_pktmbuf_mtophys_offset(m, 0)
1525 * A macro that returns the length of the packet.
1527 * The value can be read or assigned.
1532 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
1535 * A macro that returns the length of the segment.
1537 * The value can be read or assigned.
1542 #define rte_pktmbuf_data_len(m) ((m)->data_len)
1545 * Prepend len bytes to an mbuf data area.
1547 * Returns a pointer to the new
1548 * data start address. If there is not enough headroom in the first
1549 * segment, the function will return NULL, without modifying the mbuf.
1554 * The amount of data to prepend (in bytes).
1556 * A pointer to the start of the newly prepended data, or
1557 * NULL if there is not enough headroom space in the first segment
1559 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
1562 __rte_mbuf_sanity_check(m, 1);
1564 if (unlikely(len > rte_pktmbuf_headroom(m)))
1568 m->data_len = (uint16_t)(m->data_len + len);
1569 m->pkt_len = (m->pkt_len + len);
1571 return (char *)m->buf_addr + m->data_off;
1575 * Append len bytes to an mbuf.
1577 * Append len bytes to an mbuf and return a pointer to the start address
1578 * of the added data. If there is not enough tailroom in the last
1579 * segment, the function will return NULL, without modifying the mbuf.
1584 * The amount of data to append (in bytes).
1586 * A pointer to the start of the newly appended data, or
1587 * NULL if there is not enough tailroom space in the last segment
1589 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
1592 struct rte_mbuf *m_last;
1594 __rte_mbuf_sanity_check(m, 1);
1596 m_last = rte_pktmbuf_lastseg(m);
1597 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
1600 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
1601 m_last->data_len = (uint16_t)(m_last->data_len + len);
1602 m->pkt_len = (m->pkt_len + len);
1603 return (char*) tail;
1607 * Remove len bytes at the beginning of an mbuf.
1609 * Returns a pointer to the start address of the new data area. If the
1610 * length is greater than the length of the first segment, then the
1611 * function will fail and return NULL, without modifying the mbuf.
1616 * The amount of data to remove (in bytes).
1618 * A pointer to the new start of the data.
1620 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
1622 __rte_mbuf_sanity_check(m, 1);
1624 if (unlikely(len > m->data_len))
1627 m->data_len = (uint16_t)(m->data_len - len);
1629 m->pkt_len = (m->pkt_len - len);
1630 return (char *)m->buf_addr + m->data_off;
1634 * Remove len bytes of data at the end of the mbuf.
1636 * If the length is greater than the length of the last segment, the
1637 * function will fail and return -1 without modifying the mbuf.
1642 * The amount of data to remove (in bytes).
1647 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
1649 struct rte_mbuf *m_last;
1651 __rte_mbuf_sanity_check(m, 1);
1653 m_last = rte_pktmbuf_lastseg(m);
1654 if (unlikely(len > m_last->data_len))
1657 m_last->data_len = (uint16_t)(m_last->data_len - len);
1658 m->pkt_len = (m->pkt_len - len);
1663 * Test if mbuf data is contiguous.
1668 * - 1, if all data is contiguous (one segment).
1669 * - 0, if there is several segments.
1671 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
1673 __rte_mbuf_sanity_check(m, 1);
1674 return !!(m->nb_segs == 1);
1678 * @internal used by rte_pktmbuf_read().
1680 const void *__rte_pktmbuf_read(const struct rte_mbuf *m, uint32_t off,
1681 uint32_t len, void *buf);
1684 * Read len data bytes in a mbuf at specified offset.
1686 * If the data is contiguous, return the pointer in the mbuf data, else
1687 * copy the data in the buffer provided by the user and return its
1691 * The pointer to the mbuf.
1693 * The offset of the data in the mbuf.
1695 * The amount of bytes to read.
1697 * The buffer where data is copied if it is not contigous in mbuf
1698 * data. Its length should be at least equal to the len parameter.
1700 * The pointer to the data, either in the mbuf if it is contiguous,
1701 * or in the user buffer. If mbuf is too small, NULL is returned.
1703 static inline const void *rte_pktmbuf_read(const struct rte_mbuf *m,
1704 uint32_t off, uint32_t len, void *buf)
1706 if (likely(off + len <= rte_pktmbuf_data_len(m)))
1707 return rte_pktmbuf_mtod_offset(m, char *, off);
1709 return __rte_pktmbuf_read(m, off, len, buf);
1713 * Chain an mbuf to another, thereby creating a segmented packet.
1715 * Note: The implementation will do a linear walk over the segments to find
1716 * the tail entry. For cases when there are many segments, it's better to
1717 * chain the entries manually.
1720 * The head of the mbuf chain (the first packet)
1722 * The mbuf to put last in the chain
1726 * - -EOVERFLOW, if the chain is full (256 entries)
1728 static inline int rte_pktmbuf_chain(struct rte_mbuf *head, struct rte_mbuf *tail)
1730 struct rte_mbuf *cur_tail;
1732 /* Check for number-of-segments-overflow */
1733 if (head->nb_segs + tail->nb_segs >= 1 << (sizeof(head->nb_segs) * 8))
1736 /* Chain 'tail' onto the old tail */
1737 cur_tail = rte_pktmbuf_lastseg(head);
1738 cur_tail->next = tail;
1740 /* accumulate number of segments and total length. */
1741 head->nb_segs = (uint8_t)(head->nb_segs + tail->nb_segs);
1742 head->pkt_len += tail->pkt_len;
1744 /* pkt_len is only set in the head */
1745 tail->pkt_len = tail->data_len;
1751 * Validate general requirements for Tx offload in mbuf.
1753 * This function checks correctness and completeness of Tx offload settings.
1756 * The packet mbuf to be validated.
1758 * 0 if packet is valid
1761 rte_validate_tx_offload(const struct rte_mbuf *m)
1763 uint64_t ol_flags = m->ol_flags;
1764 uint64_t inner_l3_offset = m->l2_len;
1766 /* Does packet set any of available offloads? */
1767 if (!(ol_flags & PKT_TX_OFFLOAD_MASK))
1770 if (ol_flags & PKT_TX_OUTER_IP_CKSUM)
1771 inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
1773 /* Headers are fragmented */
1774 if (rte_pktmbuf_data_len(m) < inner_l3_offset + m->l3_len + m->l4_len)
1777 /* IP checksum can be counted only for IPv4 packet */
1778 if ((ol_flags & PKT_TX_IP_CKSUM) && (ol_flags & PKT_TX_IPV6))
1781 /* IP type not set when required */
1782 if (ol_flags & (PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
1783 if (!(ol_flags & (PKT_TX_IPV4 | PKT_TX_IPV6)))
1786 /* Check requirements for TSO packet */
1787 if (ol_flags & PKT_TX_TCP_SEG)
1788 if ((m->tso_segsz == 0) ||
1789 ((ol_flags & PKT_TX_IPV4) &&
1790 !(ol_flags & PKT_TX_IP_CKSUM)))
1793 /* PKT_TX_OUTER_IP_CKSUM set for non outer IPv4 packet. */
1794 if ((ol_flags & PKT_TX_OUTER_IP_CKSUM) &&
1795 !(ol_flags & PKT_TX_OUTER_IPV4))
1802 * Linearize data in mbuf.
1804 * This function moves the mbuf data in the first segment if there is enough
1805 * tailroom. The subsequent segments are unchained and freed.
1814 rte_pktmbuf_linearize(struct rte_mbuf *mbuf)
1816 int seg_len, copy_len;
1818 struct rte_mbuf *m_next;
1821 if (rte_pktmbuf_is_contiguous(mbuf))
1824 /* Extend first segment to the total packet length */
1825 copy_len = rte_pktmbuf_pkt_len(mbuf) - rte_pktmbuf_data_len(mbuf);
1827 if (unlikely(copy_len > rte_pktmbuf_tailroom(mbuf)))
1830 buffer = rte_pktmbuf_mtod_offset(mbuf, char *, mbuf->data_len);
1831 mbuf->data_len = (uint16_t)(mbuf->pkt_len);
1833 /* Append data from next segments to the first one */
1838 seg_len = rte_pktmbuf_data_len(m);
1839 rte_memcpy(buffer, rte_pktmbuf_mtod(m, char *), seg_len);
1842 rte_pktmbuf_free_seg(m);
1853 * Dump an mbuf structure to a file.
1855 * Dump all fields for the given packet mbuf and all its associated
1856 * segments (in the case of a chained buffer).
1859 * A pointer to a file for output
1863 * If dump_len != 0, also dump the "dump_len" first data bytes of
1866 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1872 #endif /* _RTE_MBUF_H_ */