4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
5 * Copyright 2014 6WIND S.A.
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9 * modification, are permitted provided that the following conditions
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32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 * The mbuf library provides the ability to create and destroy buffers
43 * that may be used by the RTE application to store message
44 * buffers. The message buffers are stored in a mempool, using the
45 * RTE mempool library.
47 * This library provide an API to allocate/free packet mbufs, which are
48 * used to carry network packets.
50 * To understand the concepts of packet buffers or mbufs, you
51 * should read "TCP/IP Illustrated, Volume 2: The Implementation,
52 * Addison-Wesley, 1995, ISBN 0-201-63354-X from Richard Stevens"
53 * http://www.kohala.com/start/tcpipiv2.html
57 #include <rte_common.h>
58 #include <rte_mempool.h>
59 #include <rte_memory.h>
60 #include <rte_atomic.h>
61 #include <rte_prefetch.h>
62 #include <rte_branch_prediction.h>
68 /* deprecated options */
69 #pragma GCC poison RTE_MBUF_SCATTER_GATHER
70 #pragma GCC poison RTE_MBUF_REFCNT
73 * Packet Offload Features Flags. It also carry packet type information.
74 * Critical resources. Both rx/tx shared these bits. Be cautious on any change
76 * - RX flags start at bit position zero, and get added to the left of previous
78 * - The most-significant 3 bits are reserved for generic mbuf flags
79 * - TX flags therefore start at bit position 60 (i.e. 63-3), and new flags get
80 * added to the right of the previously defined flags i.e. they should count
81 * downwards, not upwards.
83 * Keep these flags synchronized with rte_get_rx_ol_flag_name() and
84 * rte_get_tx_ol_flag_name().
86 #define PKT_RX_VLAN_PKT (1ULL << 0) /**< RX packet is a 802.1q VLAN packet. */
87 #define PKT_RX_RSS_HASH (1ULL << 1) /**< RX packet with RSS hash result. */
88 #define PKT_RX_FDIR (1ULL << 2) /**< RX packet with FDIR match indicate. */
89 #define PKT_RX_L4_CKSUM_BAD (1ULL << 3) /**< L4 cksum of RX pkt. is not OK. */
90 #define PKT_RX_IP_CKSUM_BAD (1ULL << 4) /**< IP cksum of RX pkt. is not OK. */
91 #define PKT_RX_EIP_CKSUM_BAD (0ULL << 0) /**< External IP header checksum error. */
92 #define PKT_RX_OVERSIZE (0ULL << 0) /**< Num of desc of an RX pkt oversize. */
93 #define PKT_RX_HBUF_OVERFLOW (0ULL << 0) /**< Header buffer overflow. */
94 #define PKT_RX_RECIP_ERR (0ULL << 0) /**< Hardware processing error. */
95 #define PKT_RX_MAC_ERR (0ULL << 0) /**< MAC error. */
97 #define PKT_RX_IPV4_HDR (1ULL << 5) /**< RX packet with IPv4 header. */
98 #define PKT_RX_IPV4_HDR_EXT (1ULL << 6) /**< RX packet with extended IPv4 header. */
99 #define PKT_RX_IPV6_HDR (1ULL << 7) /**< RX packet with IPv6 header. */
100 #define PKT_RX_IPV6_HDR_EXT (1ULL << 8) /**< RX packet with extended IPv6 header. */
101 #endif /* RTE_NEXT_ABI */
102 #define PKT_RX_IEEE1588_PTP (1ULL << 9) /**< RX IEEE1588 L2 Ethernet PT Packet. */
103 #define PKT_RX_IEEE1588_TMST (1ULL << 10) /**< RX IEEE1588 L2/L4 timestamped packet.*/
105 #define PKT_RX_TUNNEL_IPV4_HDR (1ULL << 11) /**< RX tunnel packet with IPv4 header.*/
106 #define PKT_RX_TUNNEL_IPV6_HDR (1ULL << 12) /**< RX tunnel packet with IPv6 header. */
107 #endif /* RTE_NEXT_ABI */
108 #define PKT_RX_FDIR_ID (1ULL << 13) /**< FD id reported if FDIR match. */
109 #define PKT_RX_FDIR_FLX (1ULL << 14) /**< Flexible bytes reported if FDIR match. */
110 #define PKT_RX_QINQ_PKT (1ULL << 15) /**< RX packet with double VLAN stripped. */
111 /* add new RX flags here */
113 /* add new TX flags here */
116 * Second VLAN insertion (QinQ) flag.
118 #define PKT_TX_QINQ_PKT (1ULL << 49) /**< TX packet with double VLAN inserted. */
121 * TCP segmentation offload. To enable this offload feature for a
122 * packet to be transmitted on hardware supporting TSO:
123 * - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
125 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
126 * - if it's IPv4, set the PKT_TX_IP_CKSUM flag and write the IP checksum
128 * - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
129 * - calculate the pseudo header checksum without taking ip_len in account,
130 * and set it in the TCP header. Refer to rte_ipv4_phdr_cksum() and
131 * rte_ipv6_phdr_cksum() that can be used as helpers.
133 #define PKT_TX_TCP_SEG (1ULL << 50)
135 #define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
138 * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
139 * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
140 * L4 checksum offload, the user needs to:
141 * - fill l2_len and l3_len in mbuf
142 * - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
143 * - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
144 * - calculate the pseudo header checksum and set it in the L4 header (only
145 * for TCP or UDP). See rte_ipv4_phdr_cksum() and rte_ipv6_phdr_cksum().
146 * For SCTP, set the crc field to 0.
148 #define PKT_TX_L4_NO_CKSUM (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
149 #define PKT_TX_TCP_CKSUM (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */
150 #define PKT_TX_SCTP_CKSUM (2ULL << 52) /**< SCTP cksum of TX pkt. computed by NIC. */
151 #define PKT_TX_UDP_CKSUM (3ULL << 52) /**< UDP cksum of TX pkt. computed by NIC. */
152 #define PKT_TX_L4_MASK (3ULL << 52) /**< Mask for L4 cksum offload request. */
155 * Offload the IP checksum in the hardware. The flag PKT_TX_IPV4 should
156 * also be set by the application, although a PMD will only check
158 * - set the IP checksum field in the packet to 0
159 * - fill the mbuf offload information: l2_len, l3_len
161 #define PKT_TX_IP_CKSUM (1ULL << 54)
164 * Packet is IPv4. This flag must be set when using any offload feature
165 * (TSO, L3 or L4 checksum) to tell the NIC that the packet is an IPv4
166 * packet. If the packet is a tunneled packet, this flag is related to
169 #define PKT_TX_IPV4 (1ULL << 55)
172 * Packet is IPv6. This flag must be set when using an offload feature
173 * (TSO or L4 checksum) to tell the NIC that the packet is an IPv6
174 * packet. If the packet is a tunneled packet, this flag is related to
177 #define PKT_TX_IPV6 (1ULL << 56)
179 #define PKT_TX_VLAN_PKT (1ULL << 57) /**< TX packet is a 802.1q VLAN packet. */
182 * Offload the IP checksum of an external header in the hardware. The
183 * flag PKT_TX_OUTER_IPV4 should also be set by the application, alto ugh
184 * a PMD will only check PKT_TX_IP_CKSUM. The IP checksum field in the
185 * packet must be set to 0.
186 * - set the outer IP checksum field in the packet to 0
187 * - fill the mbuf offload information: outer_l2_len, outer_l3_len
189 #define PKT_TX_OUTER_IP_CKSUM (1ULL << 58)
192 * Packet outer header is IPv4. This flag must be set when using any
193 * outer offload feature (L3 or L4 checksum) to tell the NIC that the
194 * outer header of the tunneled packet is an IPv4 packet.
196 #define PKT_TX_OUTER_IPV4 (1ULL << 59)
199 * Packet outer header is IPv6. This flag must be set when using any
200 * outer offload feature (L4 checksum) to tell the NIC that the outer
201 * header of the tunneled packet is an IPv6 packet.
203 #define PKT_TX_OUTER_IPV6 (1ULL << 60)
205 #define __RESERVED (1ULL << 61) /**< reserved for future mbuf use */
207 #define IND_ATTACHED_MBUF (1ULL << 62) /**< Indirect attached mbuf */
209 /* Use final bit of flags to indicate a control mbuf */
210 #define CTRL_MBUF_FLAG (1ULL << 63) /**< Mbuf contains control data */
214 * 32 bits are divided into several fields to mark packet types. Note that
215 * each field is indexical.
216 * - Bit 3:0 is for L2 types.
217 * - Bit 7:4 is for L3 or outer L3 (for tunneling case) types.
218 * - Bit 11:8 is for L4 or outer L4 (for tunneling case) types.
219 * - Bit 15:12 is for tunnel types.
220 * - Bit 19:16 is for inner L2 types.
221 * - Bit 23:20 is for inner L3 types.
222 * - Bit 27:24 is for inner L4 types.
223 * - Bit 31:28 is reserved.
225 * To be compatible with Vector PMD, RTE_PTYPE_L3_IPV4, RTE_PTYPE_L3_IPV4_EXT,
226 * RTE_PTYPE_L3_IPV6, RTE_PTYPE_L3_IPV6_EXT, RTE_PTYPE_L4_TCP, RTE_PTYPE_L4_UDP
227 * and RTE_PTYPE_L4_SCTP should be kept as below in a contiguous 7 bits.
229 * Note that L3 types values are selected for checking IPV4/IPV6 header from
230 * performance point of view. Reading annotations of RTE_ETH_IS_IPV4_HDR and
231 * RTE_ETH_IS_IPV6_HDR is needed for any future changes of L3 type values.
233 * Note that the packet types of the same packet recognized by different
234 * hardware may be different, as different hardware may have different
235 * capability of packet type recognition.
238 * <'ether type'=0x0800
239 * | 'version'=4, 'protocol'=0x29
240 * | 'version'=6, 'next header'=0x3A
242 * will be recognized on i40e hardware as packet type combination of,
243 * RTE_PTYPE_L2_ETHER |
244 * RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
245 * RTE_PTYPE_TUNNEL_IP |
246 * RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN |
247 * RTE_PTYPE_INNER_L4_ICMP.
249 * <'ether type'=0x86DD
250 * | 'version'=6, 'next header'=0x2F
252 * | 'version'=6, 'next header'=0x11
254 * will be recognized on i40e hardware as packet type combination of,
255 * RTE_PTYPE_L2_ETHER |
256 * RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
257 * RTE_PTYPE_TUNNEL_GRENAT |
258 * RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN |
259 * RTE_PTYPE_INNER_L4_UDP.
261 #define RTE_PTYPE_UNKNOWN 0x00000000
263 * Ethernet packet type.
264 * It is used for outer packet for tunneling cases.
267 * <'ether type'=[0x0800|0x86DD]>
269 #define RTE_PTYPE_L2_ETHER 0x00000001
271 * Ethernet packet type for time sync.
274 * <'ether type'=0x88F7>
276 #define RTE_PTYPE_L2_ETHER_TIMESYNC 0x00000002
278 * ARP (Address Resolution Protocol) packet type.
281 * <'ether type'=0x0806>
283 #define RTE_PTYPE_L2_ETHER_ARP 0x00000003
285 * LLDP (Link Layer Discovery Protocol) packet type.
288 * <'ether type'=0x88CC>
290 #define RTE_PTYPE_L2_ETHER_LLDP 0x00000004
292 * Mask of layer 2 packet types.
293 * It is used for outer packet for tunneling cases.
295 #define RTE_PTYPE_L2_MASK 0x0000000f
297 * IP (Internet Protocol) version 4 packet type.
298 * It is used for outer packet for tunneling cases, and does not contain any
302 * <'ether type'=0x0800
303 * | 'version'=4, 'ihl'=5>
305 #define RTE_PTYPE_L3_IPV4 0x00000010
307 * IP (Internet Protocol) version 4 packet type.
308 * It is used for outer packet for tunneling cases, and contains header
312 * <'ether type'=0x0800
313 * | 'version'=4, 'ihl'=[6-15], 'options'>
315 #define RTE_PTYPE_L3_IPV4_EXT 0x00000030
317 * IP (Internet Protocol) version 6 packet type.
318 * It is used for outer packet for tunneling cases, and does not contain any
322 * <'ether type'=0x86DD
323 * | 'version'=6, 'next header'=0x3B>
325 #define RTE_PTYPE_L3_IPV6 0x00000040
327 * IP (Internet Protocol) version 4 packet type.
328 * It is used for outer packet for tunneling cases, and may or maynot contain
332 * <'ether type'=0x0800
333 * | 'version'=4, 'ihl'=[5-15], <'options'>>
335 #define RTE_PTYPE_L3_IPV4_EXT_UNKNOWN 0x00000090
337 * IP (Internet Protocol) version 6 packet type.
338 * It is used for outer packet for tunneling cases, and contains extension
342 * <'ether type'=0x86DD
343 * | 'version'=6, 'next header'=[0x0|0x2B|0x2C|0x32|0x33|0x3C|0x87],
344 * 'extension headers'>
346 #define RTE_PTYPE_L3_IPV6_EXT 0x000000c0
348 * IP (Internet Protocol) version 6 packet type.
349 * It is used for outer packet for tunneling cases, and may or maynot contain
353 * <'ether type'=0x86DD
354 * | 'version'=6, 'next header'=[0x3B|0x0|0x2B|0x2C|0x32|0x33|0x3C|0x87],
355 * <'extension headers'>>
357 #define RTE_PTYPE_L3_IPV6_EXT_UNKNOWN 0x000000e0
359 * Mask of layer 3 packet types.
360 * It is used for outer packet for tunneling cases.
362 #define RTE_PTYPE_L3_MASK 0x000000f0
364 * TCP (Transmission Control Protocol) packet type.
365 * It is used for outer packet for tunneling cases.
368 * <'ether type'=0x0800
369 * | 'version'=4, 'protocol'=6, 'MF'=0>
371 * <'ether type'=0x86DD
372 * | 'version'=6, 'next header'=6>
374 #define RTE_PTYPE_L4_TCP 0x00000100
376 * UDP (User Datagram Protocol) packet type.
377 * It is used for outer packet for tunneling cases.
380 * <'ether type'=0x0800
381 * | 'version'=4, 'protocol'=17, 'MF'=0>
383 * <'ether type'=0x86DD
384 * | 'version'=6, 'next header'=17>
386 #define RTE_PTYPE_L4_UDP 0x00000200
388 * Fragmented IP (Internet Protocol) packet type.
389 * It is used for outer packet for tunneling cases.
391 * It refers to those packets of any IP types, which can be recognized as
392 * fragmented. A fragmented packet cannot be recognized as any other L4 types
393 * (RTE_PTYPE_L4_TCP, RTE_PTYPE_L4_UDP, RTE_PTYPE_L4_SCTP, RTE_PTYPE_L4_ICMP,
394 * RTE_PTYPE_L4_NONFRAG).
397 * <'ether type'=0x0800
398 * | 'version'=4, 'MF'=1>
400 * <'ether type'=0x86DD
401 * | 'version'=6, 'next header'=44>
403 #define RTE_PTYPE_L4_FRAG 0x00000300
405 * SCTP (Stream Control Transmission Protocol) packet type.
406 * It is used for outer packet for tunneling cases.
409 * <'ether type'=0x0800
410 * | 'version'=4, 'protocol'=132, 'MF'=0>
412 * <'ether type'=0x86DD
413 * | 'version'=6, 'next header'=132>
415 #define RTE_PTYPE_L4_SCTP 0x00000400
417 * ICMP (Internet Control Message Protocol) packet type.
418 * It is used for outer packet for tunneling cases.
421 * <'ether type'=0x0800
422 * | 'version'=4, 'protocol'=1, 'MF'=0>
424 * <'ether type'=0x86DD
425 * | 'version'=6, 'next header'=1>
427 #define RTE_PTYPE_L4_ICMP 0x00000500
429 * Non-fragmented IP (Internet Protocol) packet type.
430 * It is used for outer packet for tunneling cases.
432 * It refers to those packets of any IP types, while cannot be recognized as
433 * any of above L4 types (RTE_PTYPE_L4_TCP, RTE_PTYPE_L4_UDP,
434 * RTE_PTYPE_L4_FRAG, RTE_PTYPE_L4_SCTP, RTE_PTYPE_L4_ICMP).
437 * <'ether type'=0x0800
438 * | 'version'=4, 'protocol'!=[6|17|132|1], 'MF'=0>
440 * <'ether type'=0x86DD
441 * | 'version'=6, 'next header'!=[6|17|44|132|1]>
443 #define RTE_PTYPE_L4_NONFRAG 0x00000600
445 * Mask of layer 4 packet types.
446 * It is used for outer packet for tunneling cases.
448 #define RTE_PTYPE_L4_MASK 0x00000f00
450 * IP (Internet Protocol) in IP (Internet Protocol) tunneling packet type.
453 * <'ether type'=0x0800
454 * | 'version'=4, 'protocol'=[4|41]>
456 * <'ether type'=0x86DD
457 * | 'version'=6, 'next header'=[4|41]>
459 #define RTE_PTYPE_TUNNEL_IP 0x00001000
461 * GRE (Generic Routing Encapsulation) tunneling packet type.
464 * <'ether type'=0x0800
465 * | 'version'=4, 'protocol'=47>
467 * <'ether type'=0x86DD
468 * | 'version'=6, 'next header'=47>
470 #define RTE_PTYPE_TUNNEL_GRE 0x00002000
472 * VXLAN (Virtual eXtensible Local Area Network) tunneling packet type.
475 * <'ether type'=0x0800
476 * | 'version'=4, 'protocol'=17
477 * | 'destination port'=4798>
479 * <'ether type'=0x86DD
480 * | 'version'=6, 'next header'=17
481 * | 'destination port'=4798>
483 #define RTE_PTYPE_TUNNEL_VXLAN 0x00003000
485 * NVGRE (Network Virtualization using Generic Routing Encapsulation) tunneling
489 * <'ether type'=0x0800
490 * | 'version'=4, 'protocol'=47
491 * | 'protocol type'=0x6558>
493 * <'ether type'=0x86DD
494 * | 'version'=6, 'next header'=47
495 * | 'protocol type'=0x6558'>
497 #define RTE_PTYPE_TUNNEL_NVGRE 0x00004000
499 * GENEVE (Generic Network Virtualization Encapsulation) tunneling packet type.
502 * <'ether type'=0x0800
503 * | 'version'=4, 'protocol'=17
504 * | 'destination port'=6081>
506 * <'ether type'=0x86DD
507 * | 'version'=6, 'next header'=17
508 * | 'destination port'=6081>
510 #define RTE_PTYPE_TUNNEL_GENEVE 0x00005000
512 * Tunneling packet type of Teredo, VXLAN (Virtual eXtensible Local Area
513 * Network) or GRE (Generic Routing Encapsulation) could be recognized as this
514 * packet type, if they can not be recognized independently as of hardware
517 #define RTE_PTYPE_TUNNEL_GRENAT 0x00006000
519 * Mask of tunneling packet types.
521 #define RTE_PTYPE_TUNNEL_MASK 0x0000f000
523 * Ethernet packet type.
524 * It is used for inner packet type only.
526 * Packet format (inner only):
527 * <'ether type'=[0x800|0x86DD]>
529 #define RTE_PTYPE_INNER_L2_ETHER 0x00010000
531 * Ethernet packet type with VLAN (Virtual Local Area Network) tag.
533 * Packet format (inner only):
534 * <'ether type'=[0x800|0x86DD], vlan=[1-4095]>
536 #define RTE_PTYPE_INNER_L2_ETHER_VLAN 0x00020000
538 * Mask of inner layer 2 packet types.
540 #define RTE_PTYPE_INNER_L2_MASK 0x000f0000
542 * IP (Internet Protocol) version 4 packet type.
543 * It is used for inner packet only, and does not contain any header option.
545 * Packet format (inner only):
546 * <'ether type'=0x0800
547 * | 'version'=4, 'ihl'=5>
549 #define RTE_PTYPE_INNER_L3_IPV4 0x00100000
551 * IP (Internet Protocol) version 4 packet type.
552 * It is used for inner packet only, and contains header options.
554 * Packet format (inner only):
555 * <'ether type'=0x0800
556 * | 'version'=4, 'ihl'=[6-15], 'options'>
558 #define RTE_PTYPE_INNER_L3_IPV4_EXT 0x00200000
560 * IP (Internet Protocol) version 6 packet type.
561 * It is used for inner packet only, and does not contain any extension header.
563 * Packet format (inner only):
564 * <'ether type'=0x86DD
565 * | 'version'=6, 'next header'=0x3B>
567 #define RTE_PTYPE_INNER_L3_IPV6 0x00300000
569 * IP (Internet Protocol) version 4 packet type.
570 * It is used for inner packet only, and may or maynot contain header options.
572 * Packet format (inner only):
573 * <'ether type'=0x0800
574 * | 'version'=4, 'ihl'=[5-15], <'options'>>
576 #define RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN 0x00400000
578 * IP (Internet Protocol) version 6 packet type.
579 * It is used for inner packet only, and contains extension headers.
581 * Packet format (inner only):
582 * <'ether type'=0x86DD
583 * | 'version'=6, 'next header'=[0x0|0x2B|0x2C|0x32|0x33|0x3C|0x87],
584 * 'extension headers'>
586 #define RTE_PTYPE_INNER_L3_IPV6_EXT 0x00500000
588 * IP (Internet Protocol) version 6 packet type.
589 * It is used for inner packet only, and may or maynot contain extension
592 * Packet format (inner only):
593 * <'ether type'=0x86DD
594 * | 'version'=6, 'next header'=[0x3B|0x0|0x2B|0x2C|0x32|0x33|0x3C|0x87],
595 * <'extension headers'>>
597 #define RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN 0x00600000
599 * Mask of inner layer 3 packet types.
601 #define RTE_PTYPE_INNER_L3_MASK 0x00f00000
603 * TCP (Transmission Control Protocol) packet type.
604 * It is used for inner packet only.
606 * Packet format (inner only):
607 * <'ether type'=0x0800
608 * | 'version'=4, 'protocol'=6, 'MF'=0>
610 * <'ether type'=0x86DD
611 * | 'version'=6, 'next header'=6>
613 #define RTE_PTYPE_INNER_L4_TCP 0x01000000
615 * UDP (User Datagram Protocol) packet type.
616 * It is used for inner packet only.
618 * Packet format (inner only):
619 * <'ether type'=0x0800
620 * | 'version'=4, 'protocol'=17, 'MF'=0>
622 * <'ether type'=0x86DD
623 * | 'version'=6, 'next header'=17>
625 #define RTE_PTYPE_INNER_L4_UDP 0x02000000
627 * Fragmented IP (Internet Protocol) packet type.
628 * It is used for inner packet only, and may or maynot have layer 4 packet.
630 * Packet format (inner only):
631 * <'ether type'=0x0800
632 * | 'version'=4, 'MF'=1>
634 * <'ether type'=0x86DD
635 * | 'version'=6, 'next header'=44>
637 #define RTE_PTYPE_INNER_L4_FRAG 0x03000000
639 * SCTP (Stream Control Transmission Protocol) packet type.
640 * It is used for inner packet only.
642 * Packet format (inner only):
643 * <'ether type'=0x0800
644 * | 'version'=4, 'protocol'=132, 'MF'=0>
646 * <'ether type'=0x86DD
647 * | 'version'=6, 'next header'=132>
649 #define RTE_PTYPE_INNER_L4_SCTP 0x04000000
651 * ICMP (Internet Control Message Protocol) packet type.
652 * It is used for inner packet only.
654 * Packet format (inner only):
655 * <'ether type'=0x0800
656 * | 'version'=4, 'protocol'=1, 'MF'=0>
658 * <'ether type'=0x86DD
659 * | 'version'=6, 'next header'=1>
661 #define RTE_PTYPE_INNER_L4_ICMP 0x05000000
663 * Non-fragmented IP (Internet Protocol) packet type.
664 * It is used for inner packet only, and may or maynot have other unknown layer
667 * Packet format (inner only):
668 * <'ether type'=0x0800
669 * | 'version'=4, 'protocol'!=[6|17|132|1], 'MF'=0>
671 * <'ether type'=0x86DD
672 * | 'version'=6, 'next header'!=[6|17|44|132|1]>
674 #define RTE_PTYPE_INNER_L4_NONFRAG 0x06000000
676 * Mask of inner layer 4 packet types.
678 #define RTE_PTYPE_INNER_L4_MASK 0x0f000000
681 * Check if the (outer) L3 header is IPv4. To avoid comparing IPv4 types one by
682 * one, bit 4 is selected to be used for IPv4 only. Then checking bit 4 can
683 * determine if it is an IPV4 packet.
685 #define RTE_ETH_IS_IPV4_HDR(ptype) ((ptype) & RTE_PTYPE_L3_IPV4)
688 * Check if the (outer) L3 header is IPv4. To avoid comparing IPv4 types one by
689 * one, bit 6 is selected to be used for IPv4 only. Then checking bit 6 can
690 * determine if it is an IPV4 packet.
692 #define RTE_ETH_IS_IPV6_HDR(ptype) ((ptype) & RTE_PTYPE_L3_IPV6)
694 /* Check if it is a tunneling packet */
695 #define RTE_ETH_IS_TUNNEL_PKT(ptype) ((ptype) & (RTE_PTYPE_TUNNEL_MASK | \
696 RTE_PTYPE_INNER_L2_MASK | \
697 RTE_PTYPE_INNER_L3_MASK | \
698 RTE_PTYPE_INNER_L4_MASK))
699 #endif /* RTE_NEXT_ABI */
702 * Get the name of a RX offload flag
705 * The mask describing the flag.
707 * The name of this flag, or NULL if it's not a valid RX flag.
709 const char *rte_get_rx_ol_flag_name(uint64_t mask);
712 * Get the name of a TX offload flag
715 * The mask describing the flag. Usually only one bit must be set.
716 * Several bits can be given if they belong to the same mask.
717 * Ex: PKT_TX_L4_MASK.
719 * The name of this flag, or NULL if it's not a valid TX flag.
721 const char *rte_get_tx_ol_flag_name(uint64_t mask);
724 * Some NICs need at least 2KB buffer to RX standard Ethernet frame without
725 * splitting it into multiple segments.
726 * So, for mbufs that planned to be involved into RX/TX, the recommended
727 * minimal buffer length is 2KB + RTE_PKTMBUF_HEADROOM.
729 #define RTE_MBUF_DEFAULT_DATAROOM 2048
730 #define RTE_MBUF_DEFAULT_BUF_SIZE \
731 (RTE_MBUF_DEFAULT_DATAROOM + RTE_PKTMBUF_HEADROOM)
733 /* define a set of marker types that can be used to refer to set points in the
735 typedef void *MARKER[0]; /**< generic marker for a point in a structure */
736 typedef uint8_t MARKER8[0]; /**< generic marker with 1B alignment */
737 typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
738 * with a single assignment */
741 * The generic rte_mbuf, containing a packet mbuf.
746 void *buf_addr; /**< Virtual address of segment buffer. */
747 phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
749 uint16_t buf_len; /**< Length of segment buffer. */
751 /* next 6 bytes are initialised on RX descriptor rearm */
756 * 16-bit Reference counter.
757 * It should only be accessed using the following functions:
758 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
759 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
760 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
764 rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
765 uint16_t refcnt; /**< Non-atomically accessed refcnt */
767 uint8_t nb_segs; /**< Number of segments. */
768 uint8_t port; /**< Input port. */
770 uint64_t ol_flags; /**< Offload features. */
772 /* remaining bytes are set on RX when pulling packet from descriptor */
773 MARKER rx_descriptor_fields1;
777 * The packet type, which is the combination of outer/inner L2, L3, L4
781 uint32_t packet_type; /**< L2/L3/L4 and tunnel information. */
783 uint32_t l2_type:4; /**< (Outer) L2 type. */
784 uint32_t l3_type:4; /**< (Outer) L3 type. */
785 uint32_t l4_type:4; /**< (Outer) L4 type. */
786 uint32_t tun_type:4; /**< Tunnel type. */
787 uint32_t inner_l2_type:4; /**< Inner L2 type. */
788 uint32_t inner_l3_type:4; /**< Inner L3 type. */
789 uint32_t inner_l4_type:4; /**< Inner L4 type. */
793 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
794 uint16_t data_len; /**< Amount of data in segment buffer. */
795 uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order) */
796 #else /* RTE_NEXT_ABI */
798 * The packet type, which is used to indicate ordinary packet and also
799 * tunneled packet format, i.e. each number is represented a type of
802 uint16_t packet_type;
804 uint16_t data_len; /**< Amount of data in segment buffer. */
805 uint32_t pkt_len; /**< Total pkt len: sum of all segments. */
806 uint16_t vlan_tci; /**< VLAN Tag Control Identifier (CPU order) */
807 uint16_t vlan_tci_outer; /**< Outer VLAN Tag Control Identifier (CPU order) */
808 #endif /* RTE_NEXT_ABI */
810 uint32_t rss; /**< RSS hash result if RSS enabled */
818 /**< Second 4 flexible bytes */
821 /**< First 4 flexible bytes or FD ID, dependent on
822 PKT_RX_FDIR_* flag in ol_flags. */
823 } fdir; /**< Filter identifier if FDIR enabled */
824 uint32_t sched; /**< Hierarchical scheduler */
825 uint32_t usr; /**< User defined tags. See rte_distributor_process() */
826 } hash; /**< hash information */
828 uint32_t seqn; /**< Sequence number. See also rte_reorder_insert() */
830 uint16_t vlan_tci_outer; /**< Outer VLAN Tag Control Identifier (CPU order) */
831 #endif /* RTE_NEXT_ABI */
833 /* second cache line - fields only used in slow path or on TX */
834 MARKER cacheline1 __rte_cache_aligned;
837 void *userdata; /**< Can be used for external metadata */
838 uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
841 struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
842 struct rte_mbuf *next; /**< Next segment of scattered packet. */
844 /* fields to support TX offloads */
846 uint64_t tx_offload; /**< combined for easy fetch */
848 uint64_t l2_len:7; /**< L2 (MAC) Header Length. */
849 uint64_t l3_len:9; /**< L3 (IP) Header Length. */
850 uint64_t l4_len:8; /**< L4 (TCP/UDP) Header Length. */
851 uint64_t tso_segsz:16; /**< TCP TSO segment size */
853 /* fields for TX offloading of tunnels */
854 uint64_t outer_l3_len:9; /**< Outer L3 (IP) Hdr Length. */
855 uint64_t outer_l2_len:7; /**< Outer L2 (MAC) Hdr Length. */
857 /* uint64_t unused:8; */
861 /** Size of the application private data. In case of an indirect
862 * mbuf, it stores the direct mbuf private data size. */
865 /** Timesync flags for use with IEEE1588. */
867 } __rte_cache_aligned;
869 static inline uint16_t rte_pktmbuf_priv_size(struct rte_mempool *mp);
872 * Return the mbuf owning the data buffer address of an indirect mbuf.
875 * The pointer to the indirect mbuf.
877 * The address of the direct mbuf corresponding to buffer_addr.
879 static inline struct rte_mbuf *
880 rte_mbuf_from_indirect(struct rte_mbuf *mi)
882 return RTE_PTR_SUB(mi->buf_addr, sizeof(*mi) + mi->priv_size);
886 * Return the buffer address embedded in the given mbuf.
889 * The pointer to the mbuf.
891 * The address of the data buffer owned by the mbuf.
894 rte_mbuf_to_baddr(struct rte_mbuf *md)
897 buffer_addr = (char *)md + sizeof(*md) + rte_pktmbuf_priv_size(md->pool);
902 * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
904 #define RTE_MBUF_INDIRECT(mb) ((mb)->ol_flags & IND_ATTACHED_MBUF)
907 * Returns TRUE if given mbuf is direct, or FALSE otherwise.
909 #define RTE_MBUF_DIRECT(mb) (!RTE_MBUF_INDIRECT(mb))
912 * Private data in case of pktmbuf pool.
914 * A structure that contains some pktmbuf_pool-specific data that are
915 * appended after the mempool structure (in private data).
917 struct rte_pktmbuf_pool_private {
918 uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf. */
919 uint16_t mbuf_priv_size; /**< Size of private area in each mbuf. */
922 #ifdef RTE_LIBRTE_MBUF_DEBUG
924 /** check mbuf type in debug mode */
925 #define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)
927 /** check mbuf type in debug mode if mbuf pointer is not null */
928 #define __rte_mbuf_sanity_check_raw(m, is_h) do { \
930 rte_mbuf_sanity_check(m, is_h); \
933 /** MBUF asserts in debug mode */
934 #define RTE_MBUF_ASSERT(exp) \
936 rte_panic("line%d\tassert \"" #exp "\" failed\n", __LINE__); \
939 #else /* RTE_LIBRTE_MBUF_DEBUG */
941 /** check mbuf type in debug mode */
942 #define __rte_mbuf_sanity_check(m, is_h) do { } while (0)
944 /** check mbuf type in debug mode if mbuf pointer is not null */
945 #define __rte_mbuf_sanity_check_raw(m, is_h) do { } while (0)
947 /** MBUF asserts in debug mode */
948 #define RTE_MBUF_ASSERT(exp) do { } while (0)
950 #endif /* RTE_LIBRTE_MBUF_DEBUG */
952 #ifdef RTE_MBUF_REFCNT_ATOMIC
955 * Reads the value of an mbuf's refcnt.
959 * Reference count number.
961 static inline uint16_t
962 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
964 return (uint16_t)(rte_atomic16_read(&m->refcnt_atomic));
968 * Sets an mbuf's refcnt to a defined value.
975 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
977 rte_atomic16_set(&m->refcnt_atomic, new_value);
981 * Adds given value to an mbuf's refcnt and returns its new value.
985 * Value to add/subtract
989 static inline uint16_t
990 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
993 * The atomic_add is an expensive operation, so we don't want to
994 * call it in the case where we know we are the uniq holder of
995 * this mbuf (i.e. ref_cnt == 1). Otherwise, an atomic
996 * operation has to be used because concurrent accesses on the
997 * reference counter can occur.
999 if (likely(rte_mbuf_refcnt_read(m) == 1)) {
1000 rte_mbuf_refcnt_set(m, 1 + value);
1004 return (uint16_t)(rte_atomic16_add_return(&m->refcnt_atomic, value));
1007 #else /* ! RTE_MBUF_REFCNT_ATOMIC */
1010 * Adds given value to an mbuf's refcnt and returns its new value.
1012 static inline uint16_t
1013 rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
1015 m->refcnt = (uint16_t)(m->refcnt + value);
1020 * Reads the value of an mbuf's refcnt.
1022 static inline uint16_t
1023 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
1029 * Sets an mbuf's refcnt to the defined value.
1032 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
1034 m->refcnt = new_value;
1037 #endif /* RTE_MBUF_REFCNT_ATOMIC */
1039 /** Mbuf prefetch */
1040 #define RTE_MBUF_PREFETCH_TO_FREE(m) do { \
1047 * Sanity checks on an mbuf.
1049 * Check the consistency of the given mbuf. The function will cause a
1050 * panic if corruption is detected.
1053 * The mbuf to be checked.
1055 * True if the mbuf is a packet header, false if it is a sub-segment
1056 * of a packet (in this case, some fields like nb_segs are not checked)
1059 rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);
1062 * @internal Allocate a new mbuf from mempool *mp*.
1063 * The use of that function is reserved for RTE internal needs.
1064 * Please use rte_pktmbuf_alloc().
1067 * The mempool from which mbuf is allocated.
1069 * - The pointer to the new mbuf on success.
1070 * - NULL if allocation failed.
1072 static inline struct rte_mbuf *__rte_mbuf_raw_alloc(struct rte_mempool *mp)
1076 if (rte_mempool_get(mp, &mb) < 0)
1078 m = (struct rte_mbuf *)mb;
1079 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
1080 rte_mbuf_refcnt_set(m, 1);
1085 * @internal Put mbuf back into its original mempool.
1086 * The use of that function is reserved for RTE internal needs.
1087 * Please use rte_pktmbuf_free().
1090 * The mbuf to be freed.
1092 static inline void __attribute__((always_inline))
1093 __rte_mbuf_raw_free(struct rte_mbuf *m)
1095 RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
1096 rte_mempool_put(m->pool, m);
1099 /* Operations on ctrl mbuf */
1102 * The control mbuf constructor.
1104 * This function initializes some fields in an mbuf structure that are
1105 * not modified by the user once created (mbuf type, origin pool, buffer
1106 * start address, and so on). This function is given as a callback function
1107 * to rte_mempool_create() at pool creation time.
1110 * The mempool from which the mbuf is allocated.
1112 * A pointer that can be used by the user to retrieve useful information
1113 * for mbuf initialization. This pointer comes from the ``init_arg``
1114 * parameter of rte_mempool_create().
1116 * The mbuf to initialize.
1118 * The index of the mbuf in the pool table.
1120 void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
1121 void *m, unsigned i);
1124 * Allocate a new mbuf (type is ctrl) from mempool *mp*.
1126 * This new mbuf is initialized with data pointing to the beginning of
1127 * buffer, and with a length of zero.
1130 * The mempool from which the mbuf is allocated.
1132 * - The pointer to the new mbuf on success.
1133 * - NULL if allocation failed.
1135 #define rte_ctrlmbuf_alloc(mp) rte_pktmbuf_alloc(mp)
1138 * Free a control mbuf back into its original mempool.
1141 * The control mbuf to be freed.
1143 #define rte_ctrlmbuf_free(m) rte_pktmbuf_free(m)
1146 * A macro that returns the pointer to the carried data.
1148 * The value that can be read or assigned.
1153 #define rte_ctrlmbuf_data(m) ((char *)((m)->buf_addr) + (m)->data_off)
1156 * A macro that returns the length of the carried data.
1158 * The value that can be read or assigned.
1163 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
1166 * Tests if an mbuf is a control mbuf
1169 * The mbuf to be tested
1171 * - True (1) if the mbuf is a control mbuf
1172 * - False(0) otherwise
1175 rte_is_ctrlmbuf(struct rte_mbuf *m)
1177 return !!(m->ol_flags & CTRL_MBUF_FLAG);
1180 /* Operations on pkt mbuf */
1183 * The packet mbuf constructor.
1185 * This function initializes some fields in the mbuf structure that are
1186 * not modified by the user once created (origin pool, buffer start
1187 * address, and so on). This function is given as a callback function to
1188 * rte_mempool_create() at pool creation time.
1191 * The mempool from which mbufs originate.
1193 * A pointer that can be used by the user to retrieve useful information
1194 * for mbuf initialization. This pointer comes from the ``init_arg``
1195 * parameter of rte_mempool_create().
1197 * The mbuf to initialize.
1199 * The index of the mbuf in the pool table.
1201 void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
1202 void *m, unsigned i);
1206 * A packet mbuf pool constructor.
1208 * This function initializes the mempool private data in the case of a
1209 * pktmbuf pool. This private data is needed by the driver. The
1210 * function is given as a callback function to rte_mempool_create() at
1211 * pool creation. It can be extended by the user, for example, to
1212 * provide another packet size.
1215 * The mempool from which mbufs originate.
1217 * A pointer that can be used by the user to retrieve useful information
1218 * for mbuf initialization. This pointer comes from the ``init_arg``
1219 * parameter of rte_mempool_create().
1221 void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);
1224 * Create a mbuf pool.
1226 * This function creates and initializes a packet mbuf pool. It is
1227 * a wrapper to rte_mempool_create() with the proper packet constructor
1228 * and mempool constructor.
1231 * The name of the mbuf pool.
1233 * The number of elements in the mbuf pool. The optimum size (in terms
1234 * of memory usage) for a mempool is when n is a power of two minus one:
1237 * Size of the per-core object cache. See rte_mempool_create() for
1240 * Size of application private are between the rte_mbuf structure
1241 * and the data buffer.
1242 * @param data_room_size
1243 * Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
1245 * The socket identifier where the memory should be allocated. The
1246 * value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
1249 * The pointer to the new allocated mempool, on success. NULL on error
1250 * with rte_errno set appropriately. Possible rte_errno values include:
1251 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
1252 * - E_RTE_SECONDARY - function was called from a secondary process instance
1253 * - EINVAL - cache size provided is too large
1254 * - ENOSPC - the maximum number of memzones has already been allocated
1255 * - EEXIST - a memzone with the same name already exists
1256 * - ENOMEM - no appropriate memory area found in which to create memzone
1258 struct rte_mempool *
1259 rte_pktmbuf_pool_create(const char *name, unsigned n,
1260 unsigned cache_size, uint16_t priv_size, uint16_t data_room_size,
1264 * Get the data room size of mbufs stored in a pktmbuf_pool
1266 * The data room size is the amount of data that can be stored in a
1267 * mbuf including the headroom (RTE_PKTMBUF_HEADROOM).
1270 * The packet mbuf pool.
1272 * The data room size of mbufs stored in this mempool.
1274 static inline uint16_t
1275 rte_pktmbuf_data_room_size(struct rte_mempool *mp)
1277 struct rte_pktmbuf_pool_private *mbp_priv;
1279 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1280 return mbp_priv->mbuf_data_room_size;
1284 * Get the application private size of mbufs stored in a pktmbuf_pool
1286 * The private size of mbuf is a zone located between the rte_mbuf
1287 * structure and the data buffer where an application can store data
1288 * associated to a packet.
1291 * The packet mbuf pool.
1293 * The private size of mbufs stored in this mempool.
1295 static inline uint16_t
1296 rte_pktmbuf_priv_size(struct rte_mempool *mp)
1298 struct rte_pktmbuf_pool_private *mbp_priv;
1300 mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
1301 return mbp_priv->mbuf_priv_size;
1305 * Reset the fields of a packet mbuf to their default values.
1307 * The given mbuf must have only one segment.
1310 * The packet mbuf to be resetted.
1312 static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
1318 m->vlan_tci_outer = 0;
1324 m->data_off = (RTE_PKTMBUF_HEADROOM <= m->buf_len) ?
1325 RTE_PKTMBUF_HEADROOM : m->buf_len;
1328 __rte_mbuf_sanity_check(m, 1);
1332 * Allocate a new mbuf from a mempool.
1334 * This new mbuf contains one segment, which has a length of 0. The pointer
1335 * to data is initialized to have some bytes of headroom in the buffer
1336 * (if buffer size allows).
1339 * The mempool from which the mbuf is allocated.
1341 * - The pointer to the new mbuf on success.
1342 * - NULL if allocation failed.
1344 static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
1347 if ((m = __rte_mbuf_raw_alloc(mp)) != NULL)
1348 rte_pktmbuf_reset(m);
1353 * Attach packet mbuf to another packet mbuf.
1355 * After attachment we refer the mbuf we attached as 'indirect',
1356 * while mbuf we attached to as 'direct'.
1357 * Right now, not supported:
1358 * - attachment for already indirect mbuf (e.g. - mi has to be direct).
1359 * - mbuf we trying to attach (mi) is used by someone else
1360 * e.g. it's reference counter is greater then 1.
1363 * The indirect packet mbuf.
1365 * The packet mbuf we're attaching to.
1367 static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m)
1369 struct rte_mbuf *md;
1371 RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(mi) &&
1372 rte_mbuf_refcnt_read(mi) == 1);
1374 /* if m is not direct, get the mbuf that embeds the data */
1375 if (RTE_MBUF_DIRECT(m))
1378 md = rte_mbuf_from_indirect(m);
1380 rte_mbuf_refcnt_update(md, 1);
1381 mi->priv_size = m->priv_size;
1382 mi->buf_physaddr = m->buf_physaddr;
1383 mi->buf_addr = m->buf_addr;
1384 mi->buf_len = m->buf_len;
1387 mi->data_off = m->data_off;
1388 mi->data_len = m->data_len;
1390 mi->vlan_tci = m->vlan_tci;
1391 mi->vlan_tci_outer = m->vlan_tci_outer;
1392 mi->tx_offload = m->tx_offload;
1396 mi->pkt_len = mi->data_len;
1398 mi->ol_flags = m->ol_flags | IND_ATTACHED_MBUF;
1399 mi->packet_type = m->packet_type;
1401 __rte_mbuf_sanity_check(mi, 1);
1402 __rte_mbuf_sanity_check(m, 0);
1406 * Detach an indirect packet mbuf.
1408 * - restore original mbuf address and length values.
1409 * - reset pktmbuf data and data_len to their default values.
1410 * All other fields of the given packet mbuf will be left intact.
1413 * The indirect attached packet mbuf.
1415 static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
1417 struct rte_mempool *mp = m->pool;
1418 uint32_t mbuf_size, buf_len, priv_size;
1420 priv_size = rte_pktmbuf_priv_size(mp);
1421 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
1422 buf_len = rte_pktmbuf_data_room_size(mp);
1424 m->priv_size = priv_size;
1425 m->buf_addr = (char *)m + mbuf_size;
1426 m->buf_physaddr = rte_mempool_virt2phy(mp, m) + mbuf_size;
1427 m->buf_len = (uint16_t)buf_len;
1428 m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM, (uint16_t)m->buf_len);
1433 static inline struct rte_mbuf* __attribute__((always_inline))
1434 __rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
1436 __rte_mbuf_sanity_check(m, 0);
1438 if (likely(rte_mbuf_refcnt_update(m, -1) == 0)) {
1440 /* if this is an indirect mbuf, then
1442 * - free attached mbuf segment
1444 if (RTE_MBUF_INDIRECT(m)) {
1445 struct rte_mbuf *md = rte_mbuf_from_indirect(m);
1446 rte_pktmbuf_detach(m);
1447 if (rte_mbuf_refcnt_update(md, -1) == 0)
1448 __rte_mbuf_raw_free(md);
1456 * Free a segment of a packet mbuf into its original mempool.
1458 * Free an mbuf, without parsing other segments in case of chained
1462 * The packet mbuf segment to be freed.
1464 static inline void __attribute__((always_inline))
1465 rte_pktmbuf_free_seg(struct rte_mbuf *m)
1467 if (likely(NULL != (m = __rte_pktmbuf_prefree_seg(m)))) {
1469 __rte_mbuf_raw_free(m);
1474 * Free a packet mbuf back into its original mempool.
1476 * Free an mbuf, and all its segments in case of chained buffers. Each
1477 * segment is added back into its original mempool.
1480 * The packet mbuf to be freed.
1482 static inline void rte_pktmbuf_free(struct rte_mbuf *m)
1484 struct rte_mbuf *m_next;
1486 __rte_mbuf_sanity_check(m, 1);
1490 rte_pktmbuf_free_seg(m);
1496 * Creates a "clone" of the given packet mbuf.
1498 * Walks through all segments of the given packet mbuf, and for each of them:
1499 * - Creates a new packet mbuf from the given pool.
1500 * - Attaches newly created mbuf to the segment.
1501 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
1502 * from the original packet mbuf.
1505 * The packet mbuf to be cloned.
1507 * The mempool from which the "clone" mbufs are allocated.
1509 * - The pointer to the new "clone" mbuf on success.
1510 * - NULL if allocation fails.
1512 static inline struct rte_mbuf *rte_pktmbuf_clone(struct rte_mbuf *md,
1513 struct rte_mempool *mp)
1515 struct rte_mbuf *mc, *mi, **prev;
1519 if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
1524 pktlen = md->pkt_len;
1529 rte_pktmbuf_attach(mi, md);
1532 } while ((md = md->next) != NULL &&
1533 (mi = rte_pktmbuf_alloc(mp)) != NULL);
1537 mc->pkt_len = pktlen;
1539 /* Allocation of new indirect segment failed */
1540 if (unlikely (mi == NULL)) {
1541 rte_pktmbuf_free(mc);
1545 __rte_mbuf_sanity_check(mc, 1);
1550 * Adds given value to the refcnt of all packet mbuf segments.
1552 * Walks through all segments of given packet mbuf and for each of them
1553 * invokes rte_mbuf_refcnt_update().
1556 * The packet mbuf whose refcnt to be updated.
1558 * The value to add to the mbuf's segments refcnt.
1560 static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
1562 __rte_mbuf_sanity_check(m, 1);
1565 rte_mbuf_refcnt_update(m, v);
1566 } while ((m = m->next) != NULL);
1570 * Get the headroom in a packet mbuf.
1575 * The length of the headroom.
1577 static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
1579 __rte_mbuf_sanity_check(m, 1);
1584 * Get the tailroom of a packet mbuf.
1589 * The length of the tailroom.
1591 static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
1593 __rte_mbuf_sanity_check(m, 1);
1594 return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
1599 * Get the last segment of the packet.
1604 * The last segment of the given mbuf.
1606 static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
1608 struct rte_mbuf *m2 = (struct rte_mbuf *)m;
1610 __rte_mbuf_sanity_check(m, 1);
1611 while (m2->next != NULL)
1617 * A macro that points to an offset into the data in the mbuf.
1619 * The returned pointer is cast to type t. Before using this
1620 * function, the user must ensure that the first segment is large
1621 * enough to accommodate its data.
1626 * The offset into the mbuf data.
1628 * The type to cast the result into.
1630 #define rte_pktmbuf_mtod_offset(m, t, o) \
1631 ((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
1634 * A macro that points to the start of the data in the mbuf.
1636 * The returned pointer is cast to type t. Before using this
1637 * function, the user must ensure that the first segment is large
1638 * enough to accommodate its data.
1643 * The type to cast the result into.
1645 #define rte_pktmbuf_mtod(m, t) rte_pktmbuf_mtod_offset(m, t, 0)
1648 * A macro that returns the length of the packet.
1650 * The value can be read or assigned.
1655 #define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)
1658 * A macro that returns the length of the segment.
1660 * The value can be read or assigned.
1665 #define rte_pktmbuf_data_len(m) ((m)->data_len)
1668 * Prepend len bytes to an mbuf data area.
1670 * Returns a pointer to the new
1671 * data start address. If there is not enough headroom in the first
1672 * segment, the function will return NULL, without modifying the mbuf.
1677 * The amount of data to prepend (in bytes).
1679 * A pointer to the start of the newly prepended data, or
1680 * NULL if there is not enough headroom space in the first segment
1682 static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
1685 __rte_mbuf_sanity_check(m, 1);
1687 if (unlikely(len > rte_pktmbuf_headroom(m)))
1691 m->data_len = (uint16_t)(m->data_len + len);
1692 m->pkt_len = (m->pkt_len + len);
1694 return (char *)m->buf_addr + m->data_off;
1698 * Append len bytes to an mbuf.
1700 * Append len bytes to an mbuf and return a pointer to the start address
1701 * of the added data. If there is not enough tailroom in the last
1702 * segment, the function will return NULL, without modifying the mbuf.
1707 * The amount of data to append (in bytes).
1709 * A pointer to the start of the newly appended data, or
1710 * NULL if there is not enough tailroom space in the last segment
1712 static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
1715 struct rte_mbuf *m_last;
1717 __rte_mbuf_sanity_check(m, 1);
1719 m_last = rte_pktmbuf_lastseg(m);
1720 if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
1723 tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
1724 m_last->data_len = (uint16_t)(m_last->data_len + len);
1725 m->pkt_len = (m->pkt_len + len);
1726 return (char*) tail;
1730 * Remove len bytes at the beginning of an mbuf.
1732 * Returns a pointer to the start address of the new data area. If the
1733 * length is greater than the length of the first segment, then the
1734 * function will fail and return NULL, without modifying the mbuf.
1739 * The amount of data to remove (in bytes).
1741 * A pointer to the new start of the data.
1743 static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
1745 __rte_mbuf_sanity_check(m, 1);
1747 if (unlikely(len > m->data_len))
1750 m->data_len = (uint16_t)(m->data_len - len);
1752 m->pkt_len = (m->pkt_len - len);
1753 return (char *)m->buf_addr + m->data_off;
1757 * Remove len bytes of data at the end of the mbuf.
1759 * If the length is greater than the length of the last segment, the
1760 * function will fail and return -1 without modifying the mbuf.
1765 * The amount of data to remove (in bytes).
1770 static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
1772 struct rte_mbuf *m_last;
1774 __rte_mbuf_sanity_check(m, 1);
1776 m_last = rte_pktmbuf_lastseg(m);
1777 if (unlikely(len > m_last->data_len))
1780 m_last->data_len = (uint16_t)(m_last->data_len - len);
1781 m->pkt_len = (m->pkt_len - len);
1786 * Test if mbuf data is contiguous.
1791 * - 1, if all data is contiguous (one segment).
1792 * - 0, if there is several segments.
1794 static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
1796 __rte_mbuf_sanity_check(m, 1);
1797 return !!(m->nb_segs == 1);
1801 * Dump an mbuf structure to the console.
1803 * Dump all fields for the given packet mbuf and all its associated
1804 * segments (in the case of a chained buffer).
1807 * A pointer to a file for output
1811 * If dump_len != 0, also dump the "dump_len" first data bytes of
1814 void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);
1820 #endif /* _RTE_MBUF_H_ */