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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.
438 rte_iova_t buf_physaddr; /**< deprecated */
439 } __rte_aligned(sizeof(rte_iova_t));
441 /* next 8 bytes are initialised on RX descriptor rearm */
446 * Reference counter. Its size should at least equal to the size
447 * of port field (16 bits), to support zero-copy broadcast.
448 * It should only be accessed using the following functions:
449 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
450 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
451 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
456 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
457 uint16_t refcnt; /**< Non-atomically accessed refcnt */
459 uint16_t nb_segs; /**< Number of segments. */
461 /** Input port (16 bits to support more than 256 virtual ports). */
464 uint64_t ol_flags; /**< Offload features. */
466 /* remaining bytes are set on RX when pulling packet from descriptor */
467 MARKER rx_descriptor_fields1;
470 * The packet type, which is the combination of outer/inner L2, L3, L4
471 * and tunnel types. The packet_type is about data really present in the
472 * mbuf. Example: if vlan stripping is enabled, a received vlan packet
473 * would have RTE_PTYPE_L2_ETHER and not RTE_PTYPE_L2_VLAN because the
474 * vlan is stripped from the data.
478 uint32_t packet_type; /**< L2/L3/L4 and tunnel information. */
480 uint32_t l2_type:4; /**< (Outer) L2 type. */
481 uint32_t l3_type:4; /**< (Outer) L3 type. */
482 uint32_t l4_type:4; /**< (Outer) L4 type. */
483 uint32_t tun_type:4; /**< Tunnel type. */
486 uint8_t inner_esp_next_proto;
487 /**< ESP next protocol type, valid if
488 * RTE_PTYPE_TUNNEL_ESP tunnel type is set
493 uint8_t inner_l2_type:4;
494 /**< Inner L2 type. */
495 uint8_t inner_l3_type:4;
496 /**< Inner L3 type. */
499 uint32_t inner_l4_type:4; /**< Inner L4 type. */
503 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
504 uint16_t data_len; /**< Amount of data in segment buffer. */
505 /** VLAN TCI (CPU order), valid if PKT_RX_VLAN_STRIPPED is set. */
509 uint32_t rss; /**< RSS hash result if RSS enabled */
518 /**< Second 4 flexible bytes */
521 /**< First 4 flexible bytes or FD ID, dependent on
522 PKT_RX_FDIR_* flag in ol_flags. */
523 } fdir; /**< Filter identifier if FDIR enabled */
527 } sched; /**< Hierarchical scheduler */
528 uint32_t usr; /**< User defined tags. See rte_distributor_process() */
529 } hash; /**< hash information */
531 /** Outer VLAN TCI (CPU order), valid if PKT_RX_QINQ_STRIPPED is set. */
532 uint16_t vlan_tci_outer;
534 uint16_t buf_len; /**< Length of segment buffer. */
536 /** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference
537 * are not normalized but are always the same for a given port.
541 /* second cache line - fields only used in slow path or on TX */
542 MARKER cacheline1 __rte_cache_min_aligned;
546 void *userdata; /**< Can be used for external metadata */
547 uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
550 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
551 struct rte_mbuf *next; /**< Next segment of scattered packet. */
553 /* fields to support TX offloads */
556 uint64_t tx_offload; /**< combined for easy fetch */
560 /**< L2 (MAC) Header Length for non-tunneling pkt.
561 * Outer_L4_len + ... + Inner_L2_len for tunneling pkt.
563 uint64_t l3_len:9; /**< L3 (IP) Header Length. */
564 uint64_t l4_len:8; /**< L4 (TCP/UDP) Header Length. */
565 uint64_t tso_segsz:16; /**< TCP TSO segment size */
567 /* fields for TX offloading of tunnels */
568 uint64_t outer_l3_len:9; /**< Outer L3 (IP) Hdr Length. */
569 uint64_t outer_l2_len:7; /**< Outer L2 (MAC) Hdr Length. */
571 /* uint64_t unused:8; */
575 /** Size of the application private data. In case of an indirect
576 * mbuf, it stores the direct mbuf private data size. */
579 /** Timesync flags for use with IEEE1588. */
582 /** Sequence number. See also rte_reorder_insert(). */
585 } __rte_cache_aligned;
588 * Prefetch the first part of the mbuf
590 * The first 64 bytes of the mbuf corresponds to fields that are used early
591 * in the receive path. If the cache line of the architecture is higher than
592 * 64B, the second part will also be prefetched.
595 * The pointer to the mbuf.
598 rte_mbuf_prefetch_part1(struct rte_mbuf *m)
600 rte_prefetch0(&m->cacheline0);
604 * Prefetch the second part of the mbuf
606 * The next 64 bytes of the mbuf corresponds to fields that are used in the
607 * transmit path. If the cache line of the architecture is higher than 64B,
608 * this function does nothing as it is expected that the full mbuf is
612 * The pointer to the mbuf.
615 rte_mbuf_prefetch_part2(struct rte_mbuf *m)
617 #if RTE_CACHE_LINE_SIZE == 64
618 rte_prefetch0(&m->cacheline1);
625 static inline uint16_t rte_pktmbuf_priv_size(struct rte_mempool *mp);
628 * Return the DMA address of the beginning of the mbuf data
631 * The pointer to the mbuf.
633 * The physical address of the beginning of the mbuf data
635 static inline phys_addr_t
636 rte_mbuf_data_dma_addr(const struct rte_mbuf *mb)
638 return mb->buf_iova + mb->data_off;
642 * Return the default DMA address of the beginning of the mbuf data
644 * This function is used by drivers in their receive function, as it
645 * returns the location where data should be written by the NIC, taking
646 * the default headroom in account.
649 * The pointer to the mbuf.
651 * The physical address of the beginning of the mbuf data
653 static inline phys_addr_t
654 rte_mbuf_data_dma_addr_default(const struct rte_mbuf *mb)
656 return mb->buf_iova + RTE_PKTMBUF_HEADROOM;
660 * Return the mbuf owning the data buffer address of an indirect mbuf.
663 * The pointer to the indirect mbuf.
665 * The address of the direct mbuf corresponding to buffer_addr.
667 static inline struct rte_mbuf *
668 rte_mbuf_from_indirect(struct rte_mbuf *mi)
670 return (struct rte_mbuf *)RTE_PTR_SUB(mi->buf_addr, sizeof(*mi) + mi->priv_size);
674 * Return the buffer address embedded in the given mbuf.
677 * The pointer to the mbuf.
679 * The address of the data buffer owned by the mbuf.
682 rte_mbuf_to_baddr(struct rte_mbuf *md)
685 buffer_addr = (char *)md + sizeof(*md) + rte_pktmbuf_priv_size(md->pool);
690 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
692 #define RTE_MBUF_INDIRECT(mb) ((mb)->ol_flags & IND_ATTACHED_MBUF)
695 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
697 #define RTE_MBUF_DIRECT(mb) (!RTE_MBUF_INDIRECT(mb))
700 * Private data in case of pktmbuf pool.
702 * A structure that contains some pktmbuf_pool-specific data that are
703 * appended after the mempool structure (in private data).
705 struct rte_pktmbuf_pool_private {
706 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf. */
707 uint16_t mbuf_priv_size; /**< Size of private area in each mbuf. */
710 #ifdef RTE_LIBRTE_MBUF_DEBUG
712 /** check mbuf type in debug mode */
713 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
715 #else /* RTE_LIBRTE_MBUF_DEBUG */
717 /** check mbuf type in debug mode */
718 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
720 #endif /* RTE_LIBRTE_MBUF_DEBUG */
722 #ifdef RTE_MBUF_REFCNT_ATOMIC
725 * Reads the value of an mbuf's refcnt.
729 * Reference count number.
731 static inline uint16_t
732 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
734 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
738 * Sets an mbuf's refcnt to a defined value.
745 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
747 rte_atomic16_set(&m->refcnt_atomic, new_value);
751 * Adds given value to an mbuf's refcnt and returns its new value.
755 * Value to add/subtract
759 static inline uint16_t
760 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
763 * The atomic_add is an expensive operation, so we don't want to
764 * call it in the case where we know we are the uniq holder of
765 * this mbuf (i.e. ref_cnt == 1). Otherwise, an atomic
766 * operation has to be used because concurrent accesses on the
767 * reference counter can occur.
769 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
770 rte_mbuf_refcnt_set(m, 1 + value);
774 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
777 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
780 * Adds given value to an mbuf's refcnt and returns its new value.
782 static inline uint16_t
783 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
785 m->refcnt = (uint16_t)(m->refcnt + value);
790 * Reads the value of an mbuf's refcnt.
792 static inline uint16_t
793 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
799 * Sets an mbuf's refcnt to the defined value.
802 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
804 m->refcnt = new_value;
807 #endif /* RTE_MBUF_REFCNT_ATOMIC */
810 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
817 * Sanity checks on an mbuf.
819 * Check the consistency of the given mbuf. The function will cause a
820 * panic if corruption is detected.
823 * The mbuf to be checked.
825 * True if the mbuf is a packet header, false if it is a sub-segment
826 * of a packet (in this case, some fields like nb_segs are not checked)
829 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
831 #define MBUF_RAW_ALLOC_CHECK(m) do { \
832 RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1); \
833 RTE_ASSERT((m)->next == NULL); \
834 RTE_ASSERT((m)->nb_segs == 1); \
835 __rte_mbuf_sanity_check(m, 0); \
839 * Allocate an unitialized mbuf from mempool *mp*.
841 * This function can be used by PMDs (especially in RX functions) to
842 * allocate an unitialized mbuf. The driver is responsible of
843 * initializing all the required fields. See rte_pktmbuf_reset().
844 * For standard needs, prefer rte_pktmbuf_alloc().
846 * The caller can expect that the following fields of the mbuf structure
847 * are initialized: buf_addr, buf_iova, buf_len, refcnt=1, nb_segs=1,
848 * next=NULL, pool, priv_size. The other fields must be initialized
852 * The mempool from which mbuf is allocated.
854 * - The pointer to the new mbuf on success.
855 * - NULL if allocation failed.
857 static inline struct rte_mbuf *rte_mbuf_raw_alloc(struct rte_mempool *mp)
862 if (rte_mempool_get(mp, &mb) < 0)
864 m = (struct rte_mbuf *)mb;
865 MBUF_RAW_ALLOC_CHECK(m);
870 * Put mbuf back into its original mempool.
872 * The caller must ensure that the mbuf is direct and properly
873 * reinitialized (refcnt=1, next=NULL, nb_segs=1), as done by
874 * rte_pktmbuf_prefree_seg().
876 * This function should be used with care, when optimization is
877 * required. For standard needs, prefer rte_pktmbuf_free() or
878 * rte_pktmbuf_free_seg().
881 * The mbuf to be freed.
883 static __rte_always_inline void
884 rte_mbuf_raw_free(struct rte_mbuf *m)
886 RTE_ASSERT(RTE_MBUF_DIRECT(m));
887 RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1);
888 RTE_ASSERT(m->next == NULL);
889 RTE_ASSERT(m->nb_segs == 1);
890 __rte_mbuf_sanity_check(m, 0);
891 rte_mempool_put(m->pool, m);
894 /* compat with older versions */
897 __rte_mbuf_raw_free(struct rte_mbuf *m)
899 rte_mbuf_raw_free(m);
902 /* Operations on ctrl mbuf */
905 * The control mbuf constructor.
907 * This function initializes some fields in an mbuf structure that are
908 * not modified by the user once created (mbuf type, origin pool, buffer
909 * start address, and so on). This function is given as a callback function
910 * to rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
913 * The mempool from which the mbuf is allocated.
915 * A pointer that can be used by the user to retrieve useful information
916 * for mbuf initialization. This pointer is the opaque argument passed to
917 * rte_mempool_obj_iter() or rte_mempool_create().
919 * The mbuf to initialize.
921 * The index of the mbuf in the pool table.
923 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
924 void *m, unsigned i);
927 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
929 * This new mbuf is initialized with data pointing to the beginning of
930 * buffer, and with a length of zero.
933 * The mempool from which the mbuf is allocated.
935 * - The pointer to the new mbuf on success.
936 * - NULL if allocation failed.
938 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
941 * Free a control mbuf back into its original mempool.
944 * The control mbuf to be freed.
946 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
949 * A macro that returns the pointer to the carried data.
951 * The value that can be read or assigned.
956 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
959 * A macro that returns the length of the carried data.
961 * The value that can be read or assigned.
966 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
969 * Tests if an mbuf is a control mbuf
972 * The mbuf to be tested
974 * - True (1) if the mbuf is a control mbuf
975 * - False(0) otherwise
978 rte_is_ctrlmbuf(struct rte_mbuf *m)
980 return !!(m->ol_flags & CTRL_MBUF_FLAG);
983 /* Operations on pkt mbuf */
986 * The packet mbuf constructor.
988 * This function initializes some fields in the mbuf structure that are
989 * not modified by the user once created (origin pool, buffer start
990 * address, and so on). This function is given as a callback function to
991 * rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
994 * The mempool from which mbufs originate.
996 * A pointer that can be used by the user to retrieve useful information
997 * for mbuf initialization. This pointer is the opaque argument passed to
998 * rte_mempool_obj_iter() or rte_mempool_create().
1000 * The mbuf to initialize.
1002 * The index of the mbuf in the pool table.
1004 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
1005 void *m, unsigned i);
1009 * A packet mbuf pool constructor.
1011 * This function initializes the mempool private data in the case of a
1012 * pktmbuf pool. This private data is needed by the driver. The
1013 * function must be called on the mempool before it is used, or it
1014 * can be given as a callback function to rte_mempool_create() at
1015 * pool creation. It can be extended by the user, for example, to
1016 * provide another packet size.
1019 * The mempool from which mbufs originate.
1021 * A pointer that can be used by the user to retrieve useful information
1022 * for mbuf initialization. This pointer is the opaque argument passed to
1023 * rte_mempool_create().
1025 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
1028 * Create a mbuf pool.
1030 * This function creates and initializes a packet mbuf pool. It is
1031 * a wrapper to rte_mempool functions.
1034 * The name of the mbuf pool.
1036 * The number of elements in the mbuf pool. The optimum size (in terms
1037 * of memory usage) for a mempool is when n is a power of two minus one:
1040 * Size of the per-core object cache. See rte_mempool_create() for
1043 * Size of application private are between the rte_mbuf structure
1044 * and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
1045 * @param data_room_size
1046 * Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
1048 * The socket identifier where the memory should be allocated. The
1049 * value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
1052 * The pointer to the new allocated mempool, on success. NULL on error
1053 * with rte_errno set appropriately. Possible rte_errno values include:
1054 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
1055 * - E_RTE_SECONDARY - function was called from a secondary process instance
1056 * - EINVAL - cache size provided is too large, or priv_size is not aligned.
1057 * - ENOSPC - the maximum number of memzones has already been allocated
1058 * - EEXIST - a memzone with the same name already exists
1059 * - ENOMEM - no appropriate memory area found in which to create memzone
1061 struct rte_mempool *
1062 rte_pktmbuf_pool_create(const char *name, unsigned n,
1063 unsigned cache_size, uint16_t priv_size, uint16_t data_room_size,
1067 * Get the data room size of mbufs stored in a pktmbuf_pool
1069 * The data room size is the amount of data that can be stored in a
1070 * mbuf including the headroom (RTE_PKTMBUF_HEADROOM).
1073 * The packet mbuf pool.
1075 * The data room size of mbufs stored in this mempool.
1077 static inline uint16_t
1078 rte_pktmbuf_data_room_size(struct rte_mempool *mp)
1080 struct rte_pktmbuf_pool_private *mbp_priv;
1082 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1083 return mbp_priv->mbuf_data_room_size;
1087 * Get the application private size of mbufs stored in a pktmbuf_pool
1089 * The private size of mbuf is a zone located between the rte_mbuf
1090 * structure and the data buffer where an application can store data
1091 * associated to a packet.
1094 * The packet mbuf pool.
1096 * The private size of mbufs stored in this mempool.
1098 static inline uint16_t
1099 rte_pktmbuf_priv_size(struct rte_mempool *mp)
1101 struct rte_pktmbuf_pool_private *mbp_priv;
1103 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1104 return mbp_priv->mbuf_priv_size;
1108 * Reset the data_off field of a packet mbuf to its default value.
1110 * The given mbuf must have only one segment, which should be empty.
1113 * The packet mbuf's data_off field has to be reset.
1115 static inline void rte_pktmbuf_reset_headroom(struct rte_mbuf *m)
1117 m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM, (uint16_t)m->buf_len);
1121 * Reset the fields of a packet mbuf to their default values.
1123 * The given mbuf must have only one segment.
1126 * The packet mbuf to be resetted.
1128 #define MBUF_INVALID_PORT UINT16_MAX
1130 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
1136 m->vlan_tci_outer = 0;
1138 m->port = MBUF_INVALID_PORT;
1142 rte_pktmbuf_reset_headroom(m);
1145 __rte_mbuf_sanity_check(m, 1);
1149 * Allocate a new mbuf from a mempool.
1151 * This new mbuf contains one segment, which has a length of 0. The pointer
1152 * to data is initialized to have some bytes of headroom in the buffer
1153 * (if buffer size allows).
1156 * The mempool from which the mbuf is allocated.
1158 * - The pointer to the new mbuf on success.
1159 * - NULL if allocation failed.
1161 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
1164 if ((m = rte_mbuf_raw_alloc(mp)) != NULL)
1165 rte_pktmbuf_reset(m);
1170 * Allocate a bulk of mbufs, initialize refcnt and reset the fields to default
1174 * The mempool from which mbufs are allocated.
1176 * Array of pointers to mbufs
1181 * - -ENOENT: Not enough entries in the mempool; no mbufs are retrieved.
1183 static inline int rte_pktmbuf_alloc_bulk(struct rte_mempool *pool,
1184 struct rte_mbuf **mbufs, unsigned count)
1189 rc = rte_mempool_get_bulk(pool, (void **)mbufs, count);
1193 /* To understand duff's device on loop unwinding optimization, see
1194 * https://en.wikipedia.org/wiki/Duff's_device.
1195 * Here while() loop is used rather than do() while{} to avoid extra
1196 * check if count is zero.
1198 switch (count % 4) {
1200 while (idx != count) {
1201 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1202 rte_pktmbuf_reset(mbufs[idx]);
1206 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1207 rte_pktmbuf_reset(mbufs[idx]);
1211 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1212 rte_pktmbuf_reset(mbufs[idx]);
1216 MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
1217 rte_pktmbuf_reset(mbufs[idx]);
1226 * Attach packet mbuf to another packet mbuf.
1228 * After attachment we refer the mbuf we attached as 'indirect',
1229 * while mbuf we attached to as 'direct'.
1230 * The direct mbuf's reference counter is incremented.
1232 * Right now, not supported:
1233 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
1234 * - mbuf we trying to attach (mi) is used by someone else
1235 * e.g. it's reference counter is greater then 1.
1238 * The indirect packet mbuf.
1240 * The packet mbuf we're attaching to.
1242 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m)
1244 struct rte_mbuf *md;
1246 RTE_ASSERT(RTE_MBUF_DIRECT(mi) &&
1247 rte_mbuf_refcnt_read(mi) == 1);
1249 /* if m is not direct, get the mbuf that embeds the data */
1250 if (RTE_MBUF_DIRECT(m))
1253 md = rte_mbuf_from_indirect(m);
1255 rte_mbuf_refcnt_update(md, 1);
1256 mi->priv_size = m->priv_size;
1257 mi->buf_iova = m->buf_iova;
1258 mi->buf_addr = m->buf_addr;
1259 mi->buf_len = m->buf_len;
1261 mi->data_off = m->data_off;
1262 mi->data_len = m->data_len;
1264 mi->vlan_tci = m->vlan_tci;
1265 mi->vlan_tci_outer = m->vlan_tci_outer;
1266 mi->tx_offload = m->tx_offload;
1270 mi->pkt_len = mi->data_len;
1272 mi->ol_flags = m->ol_flags | IND_ATTACHED_MBUF;
1273 mi->packet_type = m->packet_type;
1274 mi->timestamp = m->timestamp;
1276 __rte_mbuf_sanity_check(mi, 1);
1277 __rte_mbuf_sanity_check(m, 0);
1281 * Detach an indirect packet mbuf.
1283 * - restore original mbuf address and length values.
1284 * - reset pktmbuf data and data_len to their default values.
1285 * - decrement the direct mbuf's reference counter. When the
1286 * reference counter becomes 0, the direct mbuf is freed.
1288 * All other fields of the given packet mbuf will be left intact.
1291 * The indirect attached packet mbuf.
1293 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
1295 struct rte_mbuf *md = rte_mbuf_from_indirect(m);
1296 struct rte_mempool *mp = m->pool;
1297 uint32_t mbuf_size, buf_len, priv_size;
1299 priv_size = rte_pktmbuf_priv_size(mp);
1300 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
1301 buf_len = rte_pktmbuf_data_room_size(mp);
1303 m->priv_size = priv_size;
1304 m->buf_addr = (char *)m + mbuf_size;
1305 m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
1306 m->buf_len = (uint16_t)buf_len;
1307 rte_pktmbuf_reset_headroom(m);
1311 if (rte_mbuf_refcnt_update(md, -1) == 0) {
1314 rte_mbuf_refcnt_set(md, 1);
1315 rte_mbuf_raw_free(md);
1320 * Decrease reference counter and unlink a mbuf segment
1322 * This function does the same than a free, except that it does not
1323 * return the segment to its pool.
1324 * It decreases the reference counter, and if it reaches 0, it is
1325 * detached from its parent for an indirect mbuf.
1328 * The mbuf to be unlinked
1330 * - (m) if it is the last reference. It can be recycled or freed.
1331 * - (NULL) if the mbuf still has remaining references on it.
1333 static __rte_always_inline struct rte_mbuf *
1334 rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1336 __rte_mbuf_sanity_check(m, 0);
1338 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
1340 if (RTE_MBUF_INDIRECT(m))
1341 rte_pktmbuf_detach(m);
1343 if (m->next != NULL) {
1350 } else if (rte_atomic16_add_return(&m->refcnt_atomic, -1) == 0) {
1353 if (RTE_MBUF_INDIRECT(m))
1354 rte_pktmbuf_detach(m);
1356 if (m->next != NULL) {
1360 rte_mbuf_refcnt_set(m, 1);
1367 /* deprecated, replaced by rte_pktmbuf_prefree_seg() */
1369 static inline struct rte_mbuf *
1370 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1372 return rte_pktmbuf_prefree_seg(m);
1376 * Free a segment of a packet mbuf into its original mempool.
1378 * Free an mbuf, without parsing other segments in case of chained
1382 * The packet mbuf segment to be freed.
1384 static __rte_always_inline void
1385 rte_pktmbuf_free_seg(struct rte_mbuf *m)
1387 m = rte_pktmbuf_prefree_seg(m);
1388 if (likely(m != NULL))
1389 rte_mbuf_raw_free(m);
1393 * Free a packet mbuf back into its original mempool.
1395 * Free an mbuf, and all its segments in case of chained buffers. Each
1396 * segment is added back into its original mempool.
1399 * The packet mbuf to be freed.
1401 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
1403 struct rte_mbuf *m_next;
1405 __rte_mbuf_sanity_check(m, 1);
1409 rte_pktmbuf_free_seg(m);
1415 * Creates a "clone" of the given packet mbuf.
1417 * Walks through all segments of the given packet mbuf, and for each of them:
1418 * - Creates a new packet mbuf from the given pool.
1419 * - Attaches newly created mbuf to the segment.
1420 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
1421 * from the original packet mbuf.
1424 * The packet mbuf to be cloned.
1426 * The mempool from which the "clone" mbufs are allocated.
1428 * - The pointer to the new "clone" mbuf on success.
1429 * - NULL if allocation fails.
1431 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
1432 struct rte_mempool *mp)
1434 struct rte_mbuf *mc, *mi, **prev;
1438 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
1443 pktlen = md->pkt_len;
1448 rte_pktmbuf_attach(mi, md);
1451 } while ((md = md->next) != NULL &&
1452 (mi = rte_pktmbuf_alloc(mp)) != NULL);
1456 mc->pkt_len = pktlen;
1458 /* Allocation of new indirect segment failed */
1459 if (unlikely (mi == NULL)) {
1460 rte_pktmbuf_free(mc);
1464 __rte_mbuf_sanity_check(mc, 1);
1469 * Adds given value to the refcnt of all packet mbuf segments.
1471 * Walks through all segments of given packet mbuf and for each of them
1472 * invokes rte_mbuf_refcnt_update().
1475 * The packet mbuf whose refcnt to be updated.
1477 * The value to add to the mbuf's segments refcnt.
1479 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
1481 __rte_mbuf_sanity_check(m, 1);
1484 rte_mbuf_refcnt_update(m, v);
1485 } while ((m = m->next) != NULL);
1489 * Get the headroom in a packet mbuf.
1494 * The length of the headroom.
1496 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
1498 __rte_mbuf_sanity_check(m, 0);
1503 * Get the tailroom of a packet mbuf.
1508 * The length of the tailroom.
1510 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
1512 __rte_mbuf_sanity_check(m, 0);
1513 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
1518 * Get the last segment of the packet.
1523 * The last segment of the given mbuf.
1525 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
1527 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
1529 __rte_mbuf_sanity_check(m, 1);
1530 while (m2->next != NULL)
1536 * A macro that points to an offset into the data in the mbuf.
1538 * The returned pointer is cast to type t. Before using this
1539 * function, the user must ensure that the first segment is large
1540 * enough to accommodate its data.
1545 * The offset into the mbuf data.
1547 * The type to cast the result into.
1549 #define rte_pktmbuf_mtod_offset(m, t, o) \
1550 ((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
1553 * A macro that points to the start of the data in the mbuf.
1555 * The returned pointer is cast to type t. Before using this
1556 * function, the user must ensure that the first segment is large
1557 * enough to accommodate its data.
1562 * The type to cast the result into.
1564 #define rte_pktmbuf_mtod(m, t) rte_pktmbuf_mtod_offset(m, t, 0)
1567 * A macro that returns the physical address that points to an offset of the
1568 * start of the data in the mbuf
1573 * The offset into the data to calculate address from.
1575 #define rte_pktmbuf_mtophys_offset(m, o) \
1576 (rte_iova_t)((m)->buf_iova + (m)->data_off + (o))
1579 * A macro that returns the physical address that points to the start of the
1585 #define rte_pktmbuf_mtophys(m) rte_pktmbuf_mtophys_offset(m, 0)
1588 * A macro that returns the length of the packet.
1590 * The value can be read or assigned.
1595 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
1598 * A macro that returns the length of the segment.
1600 * The value can be read or assigned.
1605 #define rte_pktmbuf_data_len(m) ((m)->data_len)
1608 * Prepend len bytes to an mbuf data area.
1610 * Returns a pointer to the new
1611 * data start address. If there is not enough headroom in the first
1612 * segment, the function will return NULL, without modifying the mbuf.
1617 * The amount of data to prepend (in bytes).
1619 * A pointer to the start of the newly prepended data, or
1620 * NULL if there is not enough headroom space in the first segment
1622 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
1625 __rte_mbuf_sanity_check(m, 1);
1627 if (unlikely(len > rte_pktmbuf_headroom(m)))
1631 m->data_len = (uint16_t)(m->data_len + len);
1632 m->pkt_len = (m->pkt_len + len);
1634 return (char *)m->buf_addr + m->data_off;
1638 * Append len bytes to an mbuf.
1640 * Append len bytes to an mbuf and return a pointer to the start address
1641 * of the added data. If there is not enough tailroom in the last
1642 * segment, the function will return NULL, without modifying the mbuf.
1647 * The amount of data to append (in bytes).
1649 * A pointer to the start of the newly appended data, or
1650 * NULL if there is not enough tailroom space in the last segment
1652 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
1655 struct rte_mbuf *m_last;
1657 __rte_mbuf_sanity_check(m, 1);
1659 m_last = rte_pktmbuf_lastseg(m);
1660 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
1663 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
1664 m_last->data_len = (uint16_t)(m_last->data_len + len);
1665 m->pkt_len = (m->pkt_len + len);
1666 return (char*) tail;
1670 * Remove len bytes at the beginning of an mbuf.
1672 * Returns a pointer to the start address of the new data area. If the
1673 * length is greater than the length of the first segment, then the
1674 * function will fail and return NULL, without modifying the mbuf.
1679 * The amount of data to remove (in bytes).
1681 * A pointer to the new start of the data.
1683 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
1685 __rte_mbuf_sanity_check(m, 1);
1687 if (unlikely(len > m->data_len))
1690 m->data_len = (uint16_t)(m->data_len - len);
1692 m->pkt_len = (m->pkt_len - len);
1693 return (char *)m->buf_addr + m->data_off;
1697 * Remove len bytes of data at the end of the mbuf.
1699 * If the length is greater than the length of the last segment, the
1700 * function will fail and return -1 without modifying the mbuf.
1705 * The amount of data to remove (in bytes).
1710 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
1712 struct rte_mbuf *m_last;
1714 __rte_mbuf_sanity_check(m, 1);
1716 m_last = rte_pktmbuf_lastseg(m);
1717 if (unlikely(len > m_last->data_len))
1720 m_last->data_len = (uint16_t)(m_last->data_len - len);
1721 m->pkt_len = (m->pkt_len - len);
1726 * Test if mbuf data is contiguous.
1731 * - 1, if all data is contiguous (one segment).
1732 * - 0, if there is several segments.
1734 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
1736 __rte_mbuf_sanity_check(m, 1);
1737 return !!(m->nb_segs == 1);
1741 * @internal used by rte_pktmbuf_read().
1743 const void *__rte_pktmbuf_read(const struct rte_mbuf *m, uint32_t off,
1744 uint32_t len, void *buf);
1747 * Read len data bytes in a mbuf at specified offset.
1749 * If the data is contiguous, return the pointer in the mbuf data, else
1750 * copy the data in the buffer provided by the user and return its
1754 * The pointer to the mbuf.
1756 * The offset of the data in the mbuf.
1758 * The amount of bytes to read.
1760 * The buffer where data is copied if it is not contigous in mbuf
1761 * data. Its length should be at least equal to the len parameter.
1763 * The pointer to the data, either in the mbuf if it is contiguous,
1764 * or in the user buffer. If mbuf is too small, NULL is returned.
1766 static inline const void *rte_pktmbuf_read(const struct rte_mbuf *m,
1767 uint32_t off, uint32_t len, void *buf)
1769 if (likely(off + len <= rte_pktmbuf_data_len(m)))
1770 return rte_pktmbuf_mtod_offset(m, char *, off);
1772 return __rte_pktmbuf_read(m, off, len, buf);
1776 * Chain an mbuf to another, thereby creating a segmented packet.
1778 * Note: The implementation will do a linear walk over the segments to find
1779 * the tail entry. For cases when there are many segments, it's better to
1780 * chain the entries manually.
1783 * The head of the mbuf chain (the first packet)
1785 * The mbuf to put last in the chain
1789 * - -EOVERFLOW, if the chain is full (256 entries)
1791 static inline int rte_pktmbuf_chain(struct rte_mbuf *head, struct rte_mbuf *tail)
1793 struct rte_mbuf *cur_tail;
1795 /* Check for number-of-segments-overflow */
1796 if (head->nb_segs + tail->nb_segs >= 1 << (sizeof(head->nb_segs) * 8))
1799 /* Chain 'tail' onto the old tail */
1800 cur_tail = rte_pktmbuf_lastseg(head);
1801 cur_tail->next = tail;
1803 /* accumulate number of segments and total length. */
1804 head->nb_segs = (uint8_t)(head->nb_segs + tail->nb_segs);
1805 head->pkt_len += tail->pkt_len;
1807 /* pkt_len is only set in the head */
1808 tail->pkt_len = tail->data_len;
1814 * Validate general requirements for Tx offload in mbuf.
1816 * This function checks correctness and completeness of Tx offload settings.
1819 * The packet mbuf to be validated.
1821 * 0 if packet is valid
1824 rte_validate_tx_offload(const struct rte_mbuf *m)
1826 uint64_t ol_flags = m->ol_flags;
1827 uint64_t inner_l3_offset = m->l2_len;
1829 /* Does packet set any of available offloads? */
1830 if (!(ol_flags & PKT_TX_OFFLOAD_MASK))
1833 if (ol_flags & PKT_TX_OUTER_IP_CKSUM)
1834 inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
1836 /* Headers are fragmented */
1837 if (rte_pktmbuf_data_len(m) < inner_l3_offset + m->l3_len + m->l4_len)
1840 /* IP checksum can be counted only for IPv4 packet */
1841 if ((ol_flags & PKT_TX_IP_CKSUM) && (ol_flags & PKT_TX_IPV6))
1844 /* IP type not set when required */
1845 if (ol_flags & (PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
1846 if (!(ol_flags & (PKT_TX_IPV4 | PKT_TX_IPV6)))
1849 /* Check requirements for TSO packet */
1850 if (ol_flags & PKT_TX_TCP_SEG)
1851 if ((m->tso_segsz == 0) ||
1852 ((ol_flags & PKT_TX_IPV4) &&
1853 !(ol_flags & PKT_TX_IP_CKSUM)))
1856 /* PKT_TX_OUTER_IP_CKSUM set for non outer IPv4 packet. */
1857 if ((ol_flags & PKT_TX_OUTER_IP_CKSUM) &&
1858 !(ol_flags & PKT_TX_OUTER_IPV4))
1865 * Linearize data in mbuf.
1867 * This function moves the mbuf data in the first segment if there is enough
1868 * tailroom. The subsequent segments are unchained and freed.
1877 rte_pktmbuf_linearize(struct rte_mbuf *mbuf)
1879 int seg_len, copy_len;
1881 struct rte_mbuf *m_next;
1884 if (rte_pktmbuf_is_contiguous(mbuf))
1887 /* Extend first segment to the total packet length */
1888 copy_len = rte_pktmbuf_pkt_len(mbuf) - rte_pktmbuf_data_len(mbuf);
1890 if (unlikely(copy_len > rte_pktmbuf_tailroom(mbuf)))
1893 buffer = rte_pktmbuf_mtod_offset(mbuf, char *, mbuf->data_len);
1894 mbuf->data_len = (uint16_t)(mbuf->pkt_len);
1896 /* Append data from next segments to the first one */
1901 seg_len = rte_pktmbuf_data_len(m);
1902 rte_memcpy(buffer, rte_pktmbuf_mtod(m, char *), seg_len);
1905 rte_pktmbuf_free_seg(m);
1916 * Dump an mbuf structure to a file.
1918 * Dump all fields for the given packet mbuf and all its associated
1919 * segments (in the case of a chained buffer).
1922 * A pointer to a file for output
1926 * If dump_len != 0, also dump the "dump_len" first data bytes of
1929 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1935 #endif /* _RTE_MBUF_H_ */