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32 * @(#)mbuf.h 8.5 (Berkeley) 2/19/95
39 /* XXX: These includes suck. Sorry! */
40 #include <sys/queue.h>
42 #include <sys/systm.h>
52 #define MBUF_PROBE1(probe, arg0) \
53 SDT_PROBE1(sdt, , , probe, arg0)
54 #define MBUF_PROBE2(probe, arg0, arg1) \
55 SDT_PROBE2(sdt, , , probe, arg0, arg1)
56 #define MBUF_PROBE3(probe, arg0, arg1, arg2) \
57 SDT_PROBE3(sdt, , , probe, arg0, arg1, arg2)
58 #define MBUF_PROBE4(probe, arg0, arg1, arg2, arg3) \
59 SDT_PROBE4(sdt, , , probe, arg0, arg1, arg2, arg3)
60 #define MBUF_PROBE5(probe, arg0, arg1, arg2, arg3, arg4) \
61 SDT_PROBE5(sdt, , , probe, arg0, arg1, arg2, arg3, arg4)
63 SDT_PROBE_DECLARE(sdt, , , m__init);
64 SDT_PROBE_DECLARE(sdt, , , m__gethdr);
65 SDT_PROBE_DECLARE(sdt, , , m__get);
66 SDT_PROBE_DECLARE(sdt, , , m__getcl);
67 SDT_PROBE_DECLARE(sdt, , , m__getjcl);
68 SDT_PROBE_DECLARE(sdt, , , m__clget);
69 SDT_PROBE_DECLARE(sdt, , , m__cljget);
70 SDT_PROBE_DECLARE(sdt, , , m__cljset);
71 SDT_PROBE_DECLARE(sdt, , , m__free);
72 SDT_PROBE_DECLARE(sdt, , , m__freem);
77 * Mbufs are of a single size, MSIZE (sys/param.h), which includes overhead.
78 * An mbuf may add a single "mbuf cluster" of size MCLBYTES (also in
79 * sys/param.h), which has no additional overhead and is used instead of the
80 * internal data area; this is done when at least MINCLSIZE of data must be
81 * stored. Additionally, it is possible to allocate a separate buffer
82 * externally and attach it to the mbuf in a way similar to that of mbuf
85 * NB: These calculation do not take actual compiler-induced alignment and
86 * padding inside the complete struct mbuf into account. Appropriate
87 * attention is required when changing members of struct mbuf.
89 * MLEN is data length in a normal mbuf.
90 * MHLEN is data length in an mbuf with pktheader.
91 * MINCLSIZE is a smallest amount of data that should be put into cluster.
93 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
97 #define MHSIZE offsetof(struct mbuf, m_dat)
98 #define MPKTHSIZE offsetof(struct mbuf, m_pktdat)
99 #define MLEN ((int)(MSIZE - MHSIZE))
100 #define MHLEN ((int)(MSIZE - MPKTHSIZE))
101 #define MINCLSIZE (MHLEN + 1)
105 * Macro for type conversion: convert mbuf pointer to data pointer of correct
108 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type.
109 * mtodo(m, o) -- Same as above but with offset 'o' into data.
111 #define mtod(m, t) ((t)((m)->m_data))
112 #define mtodo(m, o) ((void *)(((m)->m_data) + (o)))
115 * Argument structure passed to UMA routines during mbuf and packet
119 int flags; /* Flags for mbuf being allocated */
120 short type; /* Type of mbuf being allocated */
125 * Packet tag structure (see below for details).
128 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
129 u_int16_t m_tag_id; /* Tag ID */
130 u_int16_t m_tag_len; /* Length of data */
131 u_int32_t m_tag_cookie; /* ABI/Module ID */
132 void (*m_tag_free)(struct m_tag *);
136 * Static network interface owned tag.
137 * Allocated through ifp->if_snd_tag_alloc().
140 struct ifnet *ifp; /* network interface tag belongs to */
144 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
147 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
152 struct m_snd_tag *snd_tag; /* send tag, if any */
153 struct ifnet *rcvif; /* rcv interface */
155 SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */
156 int32_t len; /* total packet length */
158 /* Layer crossing persistent information. */
159 uint32_t flowid; /* packet's 4-tuple system */
160 uint32_t csum_flags; /* checksum and offload features */
161 uint16_t fibnum; /* this packet should use this fib */
162 uint8_t cosqos; /* class/quality of service */
163 uint8_t rsstype; /* hash type */
165 uint64_t rcv_tstmp; /* timestamp in ns */
167 uint8_t l2hlen; /* layer 2 hdr len */
168 uint8_t l3hlen; /* layer 3 hdr len */
169 uint8_t l4hlen; /* layer 4 hdr len */
170 uint8_t l5hlen; /* layer 5 hdr len */
177 uint32_t thirtytwo[2];
178 uint64_t sixtyfour[1];
179 uintptr_t unintptr[1];
183 /* Layer specific non-persistent local storage for reassembly, etc. */
187 uint32_t thirtytwo[2];
188 uint64_t sixtyfour[1];
189 uintptr_t unintptr[1];
193 #define ether_vtag PH_per.sixteen[0]
195 #define vt_nrecs sixteen[0]
196 #define tso_segsz PH_per.sixteen[1]
197 #define lro_nsegs tso_segsz
198 #define csum_phsum PH_per.sixteen[2]
199 #define csum_data PH_per.thirtytwo[1]
200 #define pace_thoff PH_loc.sixteen[0]
201 #define pace_tlen PH_loc.sixteen[1]
202 #define pace_drphdrlen PH_loc.sixteen[2]
203 #define pace_tos PH_loc.eight[6]
204 #define pace_lock PH_loc.eight[7]
207 * Description of external storage mapped into mbuf; valid only if M_EXT is
211 * Compile-time assertions in uipc_mbuf.c test these values to ensure that
214 typedef void m_ext_free_t(struct mbuf *);
218 * If EXT_FLAG_EMBREF is set, then we use refcount in the
219 * mbuf, the 'ext_count' member. Otherwise, we have a
220 * shadow copy and we use pointer 'ext_cnt'. The original
221 * mbuf is responsible to carry the pointer to free routine
222 * and its arguments. They aren't copied into shadows in
223 * mb_dupcl() to avoid dereferencing next cachelines.
225 volatile u_int ext_count;
226 volatile u_int *ext_cnt;
228 char *ext_buf; /* start of buffer */
229 uint32_t ext_size; /* size of buffer, for ext_free */
230 uint32_t ext_type:8, /* type of external storage */
231 ext_flags:24; /* external storage mbuf flags */
233 * Fields below store the free context for the external storage.
234 * They are valid only in the refcount carrying mbuf, the one with
235 * EXT_FLAG_EMBREF flag, with exclusion for EXT_EXTREF type, where
236 * the free context is copied into all mbufs that use same external
239 #define m_ext_copylen offsetof(struct m_ext, ext_free)
240 m_ext_free_t *ext_free; /* free routine if not the usual */
241 void *ext_arg1; /* optional argument pointer */
242 void *ext_arg2; /* optional argument pointer */
246 * The core of the mbuf object along with some shortcut defines for practical
251 * Header present at the beginning of every mbuf.
254 * Compile-time assertions in uipc_mbuf.c test these values to ensure
255 * that they are correct.
257 union { /* next buffer in chain */
259 SLIST_ENTRY(mbuf) m_slist;
260 STAILQ_ENTRY(mbuf) m_stailq;
262 union { /* next chain in queue/record */
263 struct mbuf *m_nextpkt;
264 SLIST_ENTRY(mbuf) m_slistpkt;
265 STAILQ_ENTRY(mbuf) m_stailqpkt;
267 caddr_t m_data; /* location of data */
268 int32_t m_len; /* amount of data in this mbuf */
269 uint32_t m_type:8, /* type of data in this mbuf */
270 m_flags:24; /* flags; see below */
271 #if !defined(__LP64__)
272 uint32_t m_pad; /* pad for 64bit alignment */
276 * A set of optional headers (packet header, external storage header)
277 * and internal data storage. Historically, these arrays were sized
278 * to MHLEN (space left after a packet header) and MLEN (space left
279 * after only a regular mbuf header); they are now variable size in
280 * order to support future work on variable-size mbufs.
284 struct pkthdr m_pkthdr; /* M_PKTHDR set */
286 struct m_ext m_ext; /* M_EXT set */
290 char m_dat[0]; /* !M_PKTHDR, !M_EXT */
295 * mbuf flags of global significance and layer crossing.
296 * Those of only protocol/layer specific significance are to be mapped
297 * to M_PROTO[1-12] and cleared at layer handoff boundaries.
298 * NB: Limited to the lower 24 bits.
300 #define M_EXT 0x00000001 /* has associated external storage */
301 #define M_PKTHDR 0x00000002 /* start of record */
302 #define M_EOR 0x00000004 /* end of record */
303 #define M_RDONLY 0x00000008 /* associated data is marked read-only */
304 #define M_BCAST 0x00000010 /* send/received as link-level broadcast */
305 #define M_MCAST 0x00000020 /* send/received as link-level multicast */
306 #define M_PROMISC 0x00000040 /* packet was not for us */
307 #define M_VLANTAG 0x00000080 /* ether_vtag is valid */
308 #define M_NOMAP 0x00000100 /* mbuf data is unmapped (soon from Drew) */
309 #define M_NOFREE 0x00000200 /* do not free mbuf, embedded in cluster */
310 #define M_TSTMP 0x00000400 /* rcv_tstmp field is valid */
311 #define M_TSTMP_HPREC 0x00000800 /* rcv_tstmp is high-prec, typically
312 hw-stamped on port (useful for IEEE 1588
314 #define M_TSTMP_LRO 0x00001000 /* Time LRO pushed in pkt is valid in (PH_loc) */
316 #define M_PROTO1 0x00001000 /* protocol-specific */
317 #define M_PROTO2 0x00002000 /* protocol-specific */
318 #define M_PROTO3 0x00004000 /* protocol-specific */
319 #define M_PROTO4 0x00008000 /* protocol-specific */
320 #define M_PROTO5 0x00010000 /* protocol-specific */
321 #define M_PROTO6 0x00020000 /* protocol-specific */
322 #define M_PROTO7 0x00040000 /* protocol-specific */
323 #define M_PROTO8 0x00080000 /* protocol-specific */
324 #define M_PROTO9 0x00100000 /* protocol-specific */
325 #define M_PROTO10 0x00200000 /* protocol-specific */
326 #define M_PROTO11 0x00400000 /* protocol-specific */
327 #define M_PROTO12 0x00800000 /* protocol-specific */
329 #define MB_DTOR_SKIP 0x1 /* don't pollute the cache by touching a freed mbuf */
332 * Flags to purge when crossing layers.
334 #define M_PROTOFLAGS \
335 (M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8|\
336 M_PROTO9|M_PROTO10|M_PROTO11|M_PROTO12)
339 * Flags preserved when copying m_pkthdr.
341 #define M_COPYFLAGS \
342 (M_PKTHDR|M_EOR|M_RDONLY|M_BCAST|M_MCAST|M_PROMISC|M_VLANTAG|M_TSTMP| \
343 M_TSTMP_HPREC|M_PROTOFLAGS)
346 * Mbuf flag description for use with printf(9) %b identifier.
348 #define M_FLAG_BITS \
349 "\20\1M_EXT\2M_PKTHDR\3M_EOR\4M_RDONLY\5M_BCAST\6M_MCAST" \
350 "\7M_PROMISC\10M_VLANTAG\13M_TSTMP\14M_TSTMP_HPREC"
351 #define M_FLAG_PROTOBITS \
352 "\15M_PROTO1\16M_PROTO2\17M_PROTO3\20M_PROTO4\21M_PROTO5" \
353 "\22M_PROTO6\23M_PROTO7\24M_PROTO8\25M_PROTO9\26M_PROTO10" \
354 "\27M_PROTO11\30M_PROTO12"
355 #define M_FLAG_PRINTF (M_FLAG_BITS M_FLAG_PROTOBITS)
358 * Network interface cards are able to hash protocol fields (such as IPv4
359 * addresses and TCP port numbers) classify packets into flows. These flows
360 * can then be used to maintain ordering while delivering packets to the OS
361 * via parallel input queues, as well as to provide a stateless affinity
362 * model. NIC drivers can pass up the hash via m->m_pkthdr.flowid, and set
363 * m_flag fields to indicate how the hash should be interpreted by the
366 * Most NICs support RSS, which provides ordering and explicit affinity, and
367 * use the hash m_flag bits to indicate what header fields were covered by
368 * the hash. M_HASHTYPE_OPAQUE and M_HASHTYPE_OPAQUE_HASH can be set by non-
369 * RSS cards or configurations that provide an opaque flow identifier, allowing
370 * for ordering and distribution without explicit affinity. Additionally,
371 * M_HASHTYPE_OPAQUE_HASH indicates that the flow identifier has hash
374 * The meaning of the IPV6_EX suffix:
375 * "o Home address from the home address option in the IPv6 destination
376 * options header. If the extension header is not present, use the Source
378 * o IPv6 address that is contained in the Routing-Header-Type-2 from the
379 * associated extension header. If the extension header is not present,
380 * use the Destination IPv6 Address."
382 * https://docs.microsoft.com/en-us/windows-hardware/drivers/network/rss-hashing-types#ndishashipv6ex
384 #define M_HASHTYPE_HASHPROP 0x80 /* has hash properties */
385 #define M_HASHTYPE_HASH(t) (M_HASHTYPE_HASHPROP | (t))
386 /* Microsoft RSS standard hash types */
387 #define M_HASHTYPE_NONE 0
388 #define M_HASHTYPE_RSS_IPV4 M_HASHTYPE_HASH(1) /* IPv4 2-tuple */
389 #define M_HASHTYPE_RSS_TCP_IPV4 M_HASHTYPE_HASH(2) /* TCPv4 4-tuple */
390 #define M_HASHTYPE_RSS_IPV6 M_HASHTYPE_HASH(3) /* IPv6 2-tuple */
391 #define M_HASHTYPE_RSS_TCP_IPV6 M_HASHTYPE_HASH(4) /* TCPv6 4-tuple */
392 #define M_HASHTYPE_RSS_IPV6_EX M_HASHTYPE_HASH(5) /* IPv6 2-tuple +
394 #define M_HASHTYPE_RSS_TCP_IPV6_EX M_HASHTYPE_HASH(6) /* TCPv6 4-tuple +
396 #define M_HASHTYPE_RSS_UDP_IPV4 M_HASHTYPE_HASH(7) /* IPv4 UDP 4-tuple*/
397 #define M_HASHTYPE_RSS_UDP_IPV6 M_HASHTYPE_HASH(9) /* IPv6 UDP 4-tuple*/
398 #define M_HASHTYPE_RSS_UDP_IPV6_EX M_HASHTYPE_HASH(10)/* IPv6 UDP 4-tuple +
401 #define M_HASHTYPE_OPAQUE 63 /* ordering, not affinity */
402 #define M_HASHTYPE_OPAQUE_HASH M_HASHTYPE_HASH(M_HASHTYPE_OPAQUE)
403 /* ordering+hash, not affinity*/
405 #define M_HASHTYPE_CLEAR(m) ((m)->m_pkthdr.rsstype = 0)
406 #define M_HASHTYPE_GET(m) ((m)->m_pkthdr.rsstype)
407 #define M_HASHTYPE_SET(m, v) ((m)->m_pkthdr.rsstype = (v))
408 #define M_HASHTYPE_TEST(m, v) (M_HASHTYPE_GET(m) == (v))
409 #define M_HASHTYPE_ISHASH(m) (M_HASHTYPE_GET(m) & M_HASHTYPE_HASHPROP)
412 * COS/QOS class and quality of service tags.
413 * It uses DSCP code points as base.
415 #define QOS_DSCP_CS0 0x00
416 #define QOS_DSCP_DEF QOS_DSCP_CS0
417 #define QOS_DSCP_CS1 0x20
418 #define QOS_DSCP_AF11 0x28
419 #define QOS_DSCP_AF12 0x30
420 #define QOS_DSCP_AF13 0x38
421 #define QOS_DSCP_CS2 0x40
422 #define QOS_DSCP_AF21 0x48
423 #define QOS_DSCP_AF22 0x50
424 #define QOS_DSCP_AF23 0x58
425 #define QOS_DSCP_CS3 0x60
426 #define QOS_DSCP_AF31 0x68
427 #define QOS_DSCP_AF32 0x70
428 #define QOS_DSCP_AF33 0x78
429 #define QOS_DSCP_CS4 0x80
430 #define QOS_DSCP_AF41 0x88
431 #define QOS_DSCP_AF42 0x90
432 #define QOS_DSCP_AF43 0x98
433 #define QOS_DSCP_CS5 0xa0
434 #define QOS_DSCP_EF 0xb8
435 #define QOS_DSCP_CS6 0xc0
436 #define QOS_DSCP_CS7 0xe0
439 * External mbuf storage buffer types.
441 #define EXT_CLUSTER 1 /* mbuf cluster */
442 #define EXT_SFBUF 2 /* sendfile(2)'s sf_buf */
443 #define EXT_JUMBOP 3 /* jumbo cluster page sized */
444 #define EXT_JUMBO9 4 /* jumbo cluster 9216 bytes */
445 #define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */
446 #define EXT_PACKET 6 /* mbuf+cluster from packet zone */
447 #define EXT_MBUF 7 /* external mbuf reference */
449 #define EXT_VENDOR1 224 /* for vendor-internal use */
450 #define EXT_VENDOR2 225 /* for vendor-internal use */
451 #define EXT_VENDOR3 226 /* for vendor-internal use */
452 #define EXT_VENDOR4 227 /* for vendor-internal use */
454 #define EXT_EXP1 244 /* for experimental use */
455 #define EXT_EXP2 245 /* for experimental use */
456 #define EXT_EXP3 246 /* for experimental use */
457 #define EXT_EXP4 247 /* for experimental use */
459 #define EXT_NET_DRV 252 /* custom ext_buf provided by net driver(s) */
460 #define EXT_MOD_TYPE 253 /* custom module's ext_buf type */
461 #define EXT_DISPOSABLE 254 /* can throw this buffer away w/page flipping */
462 #define EXT_EXTREF 255 /* has externally maintained ext_cnt ptr */
465 * Flags for external mbuf buffer types.
466 * NB: limited to the lower 24 bits.
468 #define EXT_FLAG_EMBREF 0x000001 /* embedded ext_count */
469 #define EXT_FLAG_EXTREF 0x000002 /* external ext_cnt, notyet */
471 #define EXT_FLAG_NOFREE 0x000010 /* don't free mbuf to pool, notyet */
473 #define EXT_FLAG_VENDOR1 0x010000 /* These flags are vendor */
474 #define EXT_FLAG_VENDOR2 0x020000 /* or submodule specific, */
475 #define EXT_FLAG_VENDOR3 0x040000 /* not used by mbuf code. */
476 #define EXT_FLAG_VENDOR4 0x080000 /* Set/read by submodule. */
478 #define EXT_FLAG_EXP1 0x100000 /* for experimental use */
479 #define EXT_FLAG_EXP2 0x200000 /* for experimental use */
480 #define EXT_FLAG_EXP3 0x400000 /* for experimental use */
481 #define EXT_FLAG_EXP4 0x800000 /* for experimental use */
484 * EXT flag description for use with printf(9) %b identifier.
486 #define EXT_FLAG_BITS \
487 "\20\1EXT_FLAG_EMBREF\2EXT_FLAG_EXTREF\5EXT_FLAG_NOFREE" \
488 "\21EXT_FLAG_VENDOR1\22EXT_FLAG_VENDOR2\23EXT_FLAG_VENDOR3" \
489 "\24EXT_FLAG_VENDOR4\25EXT_FLAG_EXP1\26EXT_FLAG_EXP2\27EXT_FLAG_EXP3" \
493 * Flags indicating checksum, segmentation and other offload work to be
494 * done, or already done, by hardware or lower layers. It is split into
495 * separate inbound and outbound flags.
497 * Outbound flags that are set by upper protocol layers requesting lower
498 * layers, or ideally the hardware, to perform these offloading tasks.
499 * For outbound packets this field and its flags can be directly tested
500 * against ifnet if_hwassist.
502 #define CSUM_IP 0x00000001 /* IP header checksum offload */
503 #define CSUM_IP_UDP 0x00000002 /* UDP checksum offload */
504 #define CSUM_IP_TCP 0x00000004 /* TCP checksum offload */
505 #define CSUM_IP_SCTP 0x00000008 /* SCTP checksum offload */
506 #define CSUM_IP_TSO 0x00000010 /* TCP segmentation offload */
507 #define CSUM_IP_ISCSI 0x00000020 /* iSCSI checksum offload */
509 #define CSUM_IP6_UDP 0x00000200 /* UDP checksum offload */
510 #define CSUM_IP6_TCP 0x00000400 /* TCP checksum offload */
511 #define CSUM_IP6_SCTP 0x00000800 /* SCTP checksum offload */
512 #define CSUM_IP6_TSO 0x00001000 /* TCP segmentation offload */
513 #define CSUM_IP6_ISCSI 0x00002000 /* iSCSI checksum offload */
515 /* Inbound checksum support where the checksum was verified by hardware. */
516 #define CSUM_L3_CALC 0x01000000 /* calculated layer 3 csum */
517 #define CSUM_L3_VALID 0x02000000 /* checksum is correct */
518 #define CSUM_L4_CALC 0x04000000 /* calculated layer 4 csum */
519 #define CSUM_L4_VALID 0x08000000 /* checksum is correct */
520 #define CSUM_L5_CALC 0x10000000 /* calculated layer 5 csum */
521 #define CSUM_L5_VALID 0x20000000 /* checksum is correct */
522 #define CSUM_COALESCED 0x40000000 /* contains merged segments */
524 #define CSUM_SND_TAG 0x80000000 /* Packet header has send tag */
527 * CSUM flag description for use with printf(9) %b identifier.
530 "\20\1CSUM_IP\2CSUM_IP_UDP\3CSUM_IP_TCP\4CSUM_IP_SCTP\5CSUM_IP_TSO" \
532 "\12CSUM_IP6_UDP\13CSUM_IP6_TCP\14CSUM_IP6_SCTP\15CSUM_IP6_TSO" \
533 "\16CSUM_IP6_ISCSI" \
534 "\31CSUM_L3_CALC\32CSUM_L3_VALID\33CSUM_L4_CALC\34CSUM_L4_VALID" \
535 "\35CSUM_L5_CALC\36CSUM_L5_VALID\37CSUM_COALESCED\40CSUM_SND_TAG"
537 /* CSUM flags compatibility mappings. */
538 #define CSUM_IP_CHECKED CSUM_L3_CALC
539 #define CSUM_IP_VALID CSUM_L3_VALID
540 #define CSUM_DATA_VALID CSUM_L4_VALID
541 #define CSUM_PSEUDO_HDR CSUM_L4_CALC
542 #define CSUM_SCTP_VALID CSUM_L4_VALID
543 #define CSUM_DELAY_DATA (CSUM_TCP|CSUM_UDP)
544 #define CSUM_DELAY_IP CSUM_IP /* Only v4, no v6 IP hdr csum */
545 #define CSUM_DELAY_DATA_IPV6 (CSUM_TCP_IPV6|CSUM_UDP_IPV6)
546 #define CSUM_DATA_VALID_IPV6 CSUM_DATA_VALID
547 #define CSUM_TCP CSUM_IP_TCP
548 #define CSUM_UDP CSUM_IP_UDP
549 #define CSUM_SCTP CSUM_IP_SCTP
550 #define CSUM_TSO (CSUM_IP_TSO|CSUM_IP6_TSO)
551 #define CSUM_UDP_IPV6 CSUM_IP6_UDP
552 #define CSUM_TCP_IPV6 CSUM_IP6_TCP
553 #define CSUM_SCTP_IPV6 CSUM_IP6_SCTP
556 * mbuf types describing the content of the mbuf (including external storage).
558 #define MT_NOTMBUF 0 /* USED INTERNALLY ONLY! Object is not mbuf */
559 #define MT_DATA 1 /* dynamic (data) allocation */
560 #define MT_HEADER MT_DATA /* packet header, use M_PKTHDR instead */
562 #define MT_VENDOR1 4 /* for vendor-internal use */
563 #define MT_VENDOR2 5 /* for vendor-internal use */
564 #define MT_VENDOR3 6 /* for vendor-internal use */
565 #define MT_VENDOR4 7 /* for vendor-internal use */
567 #define MT_SONAME 8 /* socket name */
569 #define MT_EXP1 9 /* for experimental use */
570 #define MT_EXP2 10 /* for experimental use */
571 #define MT_EXP3 11 /* for experimental use */
572 #define MT_EXP4 12 /* for experimental use */
574 #define MT_CONTROL 14 /* extra-data protocol message */
575 #define MT_EXTCONTROL 15 /* control message with externalized contents */
576 #define MT_OOBDATA 16 /* expedited data */
578 #define MT_NOINIT 255 /* Not a type but a flag to allocate
579 a non-initialized mbuf */
582 * String names of mbuf-related UMA(9) and malloc(9) types. Exposed to
583 * !_KERNEL so that monitoring tools can look up the zones with
586 #define MBUF_MEM_NAME "mbuf"
587 #define MBUF_CLUSTER_MEM_NAME "mbuf_cluster"
588 #define MBUF_PACKET_MEM_NAME "mbuf_packet"
589 #define MBUF_JUMBOP_MEM_NAME "mbuf_jumbo_page"
590 #define MBUF_JUMBO9_MEM_NAME "mbuf_jumbo_9k"
591 #define MBUF_JUMBO16_MEM_NAME "mbuf_jumbo_16k"
592 #define MBUF_TAG_MEM_NAME "mbuf_tag"
593 #define MBUF_EXTREFCNT_MEM_NAME "mbuf_ext_refcnt"
598 #define MBUF_CHECKSLEEP(how) do { \
599 if (how == M_WAITOK) \
600 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, \
601 "Sleeping in \"%s\"", __func__); \
604 #define MBUF_CHECKSLEEP(how)
608 * Network buffer allocation API
610 * The rest of it is defined in kern/kern_mbuf.c
612 extern uma_zone_t zone_mbuf;
613 extern uma_zone_t zone_clust;
614 extern uma_zone_t zone_pack;
615 extern uma_zone_t zone_jumbop;
616 extern uma_zone_t zone_jumbo9;
617 extern uma_zone_t zone_jumbo16;
619 void mb_dupcl(struct mbuf *, struct mbuf *);
620 void mb_free_ext(struct mbuf *);
621 void m_adj(struct mbuf *, int);
622 int m_apply(struct mbuf *, int, int,
623 int (*)(void *, void *, u_int), void *);
624 int m_append(struct mbuf *, int, c_caddr_t);
625 void m_cat(struct mbuf *, struct mbuf *);
626 void m_catpkt(struct mbuf *, struct mbuf *);
627 int m_clget(struct mbuf *m, int how);
628 void *m_cljget(struct mbuf *m, int how, int size);
629 struct mbuf *m_collapse(struct mbuf *, int, int);
630 void m_copyback(struct mbuf *, int, int, c_caddr_t);
631 void m_copydata(const struct mbuf *, int, int, caddr_t);
632 struct mbuf *m_copym(struct mbuf *, int, int, int);
633 struct mbuf *m_copypacket(struct mbuf *, int);
634 void m_copy_pkthdr(struct mbuf *, struct mbuf *);
635 struct mbuf *m_copyup(struct mbuf *, int, int);
636 struct mbuf *m_defrag(struct mbuf *, int);
637 void m_demote_pkthdr(struct mbuf *);
638 void m_demote(struct mbuf *, int, int);
639 struct mbuf *m_devget(char *, int, int, struct ifnet *,
640 void (*)(char *, caddr_t, u_int));
641 void m_dispose_extcontrolm(struct mbuf *m);
642 struct mbuf *m_dup(const struct mbuf *, int);
643 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
644 void m_extadd(struct mbuf *, char *, u_int, m_ext_free_t,
645 void *, void *, int, int);
646 u_int m_fixhdr(struct mbuf *);
647 struct mbuf *m_fragment(struct mbuf *, int, int);
648 void m_freem(struct mbuf *);
649 struct mbuf *m_get2(int, int, short, int);
650 struct mbuf *m_getjcl(int, short, int, int);
651 struct mbuf *m_getm2(struct mbuf *, int, int, short, int);
652 struct mbuf *m_getptr(struct mbuf *, int, int *);
653 u_int m_length(struct mbuf *, struct mbuf **);
654 int m_mbuftouio(struct uio *, const struct mbuf *, int);
655 void m_move_pkthdr(struct mbuf *, struct mbuf *);
656 int m_pkthdr_init(struct mbuf *, int);
657 struct mbuf *m_prepend(struct mbuf *, int, int);
658 void m_print(const struct mbuf *, int);
659 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
660 struct mbuf *m_pullup(struct mbuf *, int);
661 int m_sanity(struct mbuf *, int);
662 struct mbuf *m_split(struct mbuf *, int, int);
663 struct mbuf *m_uiotombuf(struct uio *, int, int, int, int);
664 struct mbuf *m_unshare(struct mbuf *, int);
678 #if MJUMPAGESIZE != MCLBYTES
690 panic("%s: invalid cluster size %d", __func__, size);
697 * Associated an external reference counted buffer with an mbuf.
700 m_extaddref(struct mbuf *m, char *buf, u_int size, u_int *ref_cnt,
701 m_ext_free_t freef, void *arg1, void *arg2)
704 KASSERT(ref_cnt != NULL, ("%s: ref_cnt not provided", __func__));
706 atomic_add_int(ref_cnt, 1);
708 m->m_ext.ext_buf = buf;
709 m->m_ext.ext_cnt = ref_cnt;
710 m->m_data = m->m_ext.ext_buf;
711 m->m_ext.ext_size = size;
712 m->m_ext.ext_free = freef;
713 m->m_ext.ext_arg1 = arg1;
714 m->m_ext.ext_arg2 = arg2;
715 m->m_ext.ext_type = EXT_EXTREF;
716 m->m_ext.ext_flags = 0;
719 static __inline uma_zone_t
728 #if MJUMPAGESIZE != MCLBYTES
740 panic("%s: invalid cluster size %d", __func__, size);
747 * Initialize an mbuf with linear storage.
749 * Inline because the consumer text overhead will be roughly the same to
750 * initialize or call a function with this many parameters and M_PKTHDR
751 * should go away with constant propagation for !MGETHDR.
754 m_init(struct mbuf *m, int how, short type, int flags)
760 m->m_data = m->m_dat;
764 if (flags & M_PKTHDR)
765 error = m_pkthdr_init(m, how);
769 MBUF_PROBE5(m__init, m, how, type, flags, error);
773 static __inline struct mbuf *
774 m_get(int how, short type)
781 m = uma_zalloc_arg(zone_mbuf, &args, how);
782 MBUF_PROBE3(m__get, how, type, m);
786 static __inline struct mbuf *
787 m_gethdr(int how, short type)
792 args.flags = M_PKTHDR;
794 m = uma_zalloc_arg(zone_mbuf, &args, how);
795 MBUF_PROBE3(m__gethdr, how, type, m);
799 static __inline struct mbuf *
800 m_getcl(int how, short type, int flags)
807 m = uma_zalloc_arg(zone_pack, &args, how);
808 MBUF_PROBE4(m__getcl, how, type, flags, m);
813 * XXX: m_cljset() is a dangerous API. One must attach only a new,
814 * unreferenced cluster to an mbuf(9). It is not possible to assert
815 * that, so care can be taken only by users of the API.
818 m_cljset(struct mbuf *m, void *cl, int type)
826 #if MJUMPAGESIZE != MCLBYTES
838 panic("%s: unknown cluster type %d", __func__, type);
842 m->m_data = m->m_ext.ext_buf = cl;
843 m->m_ext.ext_free = m->m_ext.ext_arg1 = m->m_ext.ext_arg2 = NULL;
844 m->m_ext.ext_size = size;
845 m->m_ext.ext_type = type;
846 m->m_ext.ext_flags = EXT_FLAG_EMBREF;
847 m->m_ext.ext_count = 1;
849 MBUF_PROBE3(m__cljset, m, cl, type);
853 m_chtype(struct mbuf *m, short new_type)
856 m->m_type = new_type;
860 m_clrprotoflags(struct mbuf *m)
864 m->m_flags &= ~M_PROTOFLAGS;
869 static __inline struct mbuf *
870 m_last(struct mbuf *m)
879 m_extrefcnt(struct mbuf *m)
882 KASSERT(m->m_flags & M_EXT, ("%s: M_EXT missing", __func__));
884 return ((m->m_ext.ext_flags & EXT_FLAG_EMBREF) ? m->m_ext.ext_count :
889 * mbuf, cluster, and external object allocation macros (for compatibility
892 #define M_MOVE_PKTHDR(to, from) m_move_pkthdr((to), (from))
893 #define MGET(m, how, type) ((m) = m_get((how), (type)))
894 #define MGETHDR(m, how, type) ((m) = m_gethdr((how), (type)))
895 #define MCLGET(m, how) m_clget((m), (how))
896 #define MEXTADD(m, buf, size, free, arg1, arg2, flags, type) \
897 m_extadd((m), (char *)(buf), (size), (free), (arg1), (arg2), \
899 #define m_getm(m, len, how, type) \
900 m_getm2((m), (len), (how), (type), M_PKTHDR)
903 * Evaluate TRUE if it's safe to write to the mbuf m's data region (this can
904 * be both the local data payload, or an external buffer area, depending on
905 * whether M_EXT is set).
907 #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && \
908 (!(((m)->m_flags & M_EXT)) || \
909 (m_extrefcnt(m) == 1)))
911 /* Check if the supplied mbuf has a packet header, or else panic. */
912 #define M_ASSERTPKTHDR(m) \
913 KASSERT((m) != NULL && (m)->m_flags & M_PKTHDR, \
914 ("%s: no mbuf packet header!", __func__))
917 * Ensure that the supplied mbuf is a valid, non-free mbuf.
919 * XXX: Broken at the moment. Need some UMA magic to make it work again.
921 #define M_ASSERTVALID(m) \
922 KASSERT((((struct mbuf *)m)->m_flags & 0) == 0, \
923 ("%s: attempted use of a free mbuf!", __func__))
926 * Return the address of the start of the buffer associated with an mbuf,
927 * handling external storage, packet-header mbufs, and regular data mbufs.
930 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_buf : \
931 ((m)->m_flags & M_PKTHDR) ? &(m)->m_pktdat[0] : \
935 * Return the size of the buffer associated with an mbuf, handling external
936 * storage, packet-header mbufs, and regular data mbufs.
939 (((m)->m_flags & M_EXT) ? (m)->m_ext.ext_size : \
940 ((m)->m_flags & M_PKTHDR) ? MHLEN : \
944 * Set the m_data pointer of a newly allocated mbuf to place an object of the
945 * specified size at the end of the mbuf, longword aligned.
947 * NB: Historically, we had M_ALIGN(), MH_ALIGN(), and MEXT_ALIGN() as
948 * separate macros, each asserting that it was called at the proper moment.
949 * This required callers to themselves test the storage type and call the
950 * right one. Rather than require callers to be aware of those layout
951 * decisions, we centralize here.
954 m_align(struct mbuf *m, int len)
957 const char *msg = "%s: not a virgin mbuf";
961 KASSERT(m->m_data == M_START(m), (msg, __func__));
963 adjust = M_SIZE(m) - len;
964 m->m_data += adjust &~ (sizeof(long)-1);
967 #define M_ALIGN(m, len) m_align(m, len)
968 #define MH_ALIGN(m, len) m_align(m, len)
969 #define MEXT_ALIGN(m, len) m_align(m, len)
972 * Compute the amount of space available before the current start of data in
975 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
976 * of checking writability of the mbuf data area rests solely with the caller.
978 * NB: In previous versions, M_LEADINGSPACE() would only check M_WRITABLE()
979 * for mbufs with external storage. We now allow mbuf-embedded data to be
982 #define M_LEADINGSPACE(m) \
983 (M_WRITABLE(m) ? ((m)->m_data - M_START(m)) : 0)
986 * Compute the amount of space available after the end of data in an mbuf.
988 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
989 * of checking writability of the mbuf data area rests solely with the caller.
991 * NB: In previous versions, M_TRAILINGSPACE() would only check M_WRITABLE()
992 * for mbufs with external storage. We now allow mbuf-embedded data to be
995 #define M_TRAILINGSPACE(m) \
997 ((M_START(m) + M_SIZE(m)) - ((m)->m_data + (m)->m_len)) : 0)
1000 * Arrange to prepend space of size plen to mbuf m. If a new mbuf must be
1001 * allocated, how specifies whether to wait. If the allocation fails, the
1002 * original mbuf chain is freed and m is set to NULL.
1004 #define M_PREPEND(m, plen, how) do { \
1005 struct mbuf **_mmp = &(m); \
1006 struct mbuf *_mm = *_mmp; \
1007 int _mplen = (plen); \
1008 int __mhow = (how); \
1010 MBUF_CHECKSLEEP(how); \
1011 if (M_LEADINGSPACE(_mm) >= _mplen) { \
1012 _mm->m_data -= _mplen; \
1013 _mm->m_len += _mplen; \
1015 _mm = m_prepend(_mm, _mplen, __mhow); \
1016 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
1017 _mm->m_pkthdr.len += _mplen; \
1022 * Change mbuf to new type. This is a relatively expensive operation and
1023 * should be avoided.
1025 #define MCHTYPE(m, t) m_chtype((m), (t))
1027 /* Length to m_copy to copy all. */
1028 #define M_COPYALL 1000000000
1030 extern int max_datalen; /* MHLEN - max_hdr */
1031 extern int max_hdr; /* Largest link + protocol header */
1032 extern int max_linkhdr; /* Largest link-level header */
1033 extern int max_protohdr; /* Largest protocol header */
1034 extern int nmbclusters; /* Maximum number of clusters */
1037 * Network packets may have annotations attached by affixing a list of
1038 * "packet tags" to the pkthdr structure. Packet tags are dynamically
1039 * allocated semi-opaque data structures that have a fixed header
1040 * (struct m_tag) that specifies the size of the memory block and a
1041 * <cookie,type> pair that identifies it. The cookie is a 32-bit unique
1042 * unsigned value used to identify a module or ABI. By convention this value
1043 * is chosen as the date+time that the module is created, expressed as the
1044 * number of seconds since the epoch (e.g., using date -u +'%s'). The type
1045 * value is an ABI/module-specific value that identifies a particular
1046 * annotation and is private to the module. For compatibility with systems
1047 * like OpenBSD that define packet tags w/o an ABI/module cookie, the value
1048 * PACKET_ABI_COMPAT is used to implement m_tag_get and m_tag_find
1049 * compatibility shim functions and several tag types are defined below.
1050 * Users that do not require compatibility should use a private cookie value
1051 * so that packet tag-related definitions can be maintained privately.
1053 * Note that the packet tag returned by m_tag_alloc has the default memory
1054 * alignment implemented by malloc. To reference private data one can use a
1057 * struct m_tag *mtag = m_tag_alloc(...);
1058 * struct foo *p = (struct foo *)(mtag+1);
1060 * if the alignment of struct m_tag is sufficient for referencing members of
1061 * struct foo. Otherwise it is necessary to embed struct m_tag within the
1062 * private data structure to insure proper alignment; e.g.,
1068 * struct foo *p = (struct foo *) m_tag_alloc(...);
1069 * struct m_tag *mtag = &p->tag;
1073 * Persistent tags stay with an mbuf until the mbuf is reclaimed. Otherwise
1074 * tags are expected to ``vanish'' when they pass through a network
1075 * interface. For most interfaces this happens normally as the tags are
1076 * reclaimed when the mbuf is free'd. However in some special cases
1077 * reclaiming must be done manually. An example is packets that pass through
1078 * the loopback interface. Also, one must be careful to do this when
1079 * ``turning around'' packets (e.g., icmp_reflect).
1081 * To mark a tag persistent bit-or this flag in when defining the tag id.
1082 * The tag will then be treated as described above.
1084 #define MTAG_PERSISTENT 0x800
1086 #define PACKET_TAG_NONE 0 /* Nadda */
1088 /* Packet tags for use with PACKET_ABI_COMPAT. */
1089 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
1090 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
1091 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
1092 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
1093 #define PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO 5 /* NIC notifies IPsec */
1094 #define PACKET_TAG_IPSEC_PENDING_TDB 6 /* Reminder to do IPsec */
1095 #define PACKET_TAG_BRIDGE 7 /* Bridge processing done */
1096 #define PACKET_TAG_GIF 8 /* GIF processing done */
1097 #define PACKET_TAG_GRE 9 /* GRE processing done */
1098 #define PACKET_TAG_IN_PACKET_CHECKSUM 10 /* NIC checksumming done */
1099 #define PACKET_TAG_ENCAP 11 /* Encap. processing */
1100 #define PACKET_TAG_IPSEC_SOCKET 12 /* IPSEC socket ref */
1101 #define PACKET_TAG_IPSEC_HISTORY 13 /* IPSEC history */
1102 #define PACKET_TAG_IPV6_INPUT 14 /* IPV6 input processing */
1103 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
1104 #define PACKET_TAG_DIVERT 17 /* divert info */
1105 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
1106 #define PACKET_TAG_MACLABEL (19 | MTAG_PERSISTENT) /* MAC label */
1107 #define PACKET_TAG_PF (21 | MTAG_PERSISTENT) /* PF/ALTQ information */
1108 #define PACKET_TAG_RTSOCKFAM 25 /* rtsock sa family */
1109 #define PACKET_TAG_IPOPTIONS 27 /* Saved IP options */
1110 #define PACKET_TAG_CARP 28 /* CARP info */
1111 #define PACKET_TAG_IPSEC_NAT_T_PORTS 29 /* two uint16_t */
1112 #define PACKET_TAG_ND_OUTGOING 30 /* ND outgoing */
1114 /* Specific cookies and tags. */
1116 /* Packet tag routines. */
1117 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
1118 void m_tag_delete(struct mbuf *, struct m_tag *);
1119 void m_tag_delete_chain(struct mbuf *, struct m_tag *);
1120 void m_tag_free_default(struct m_tag *);
1121 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
1122 struct m_tag *m_tag_copy(struct m_tag *, int);
1123 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
1124 void m_tag_delete_nonpersistent(struct mbuf *);
1127 * Initialize the list of tags associated with an mbuf.
1129 static __inline void
1130 m_tag_init(struct mbuf *m)
1133 SLIST_INIT(&m->m_pkthdr.tags);
1137 * Set up the contents of a tag. Note that this does not fill in the free
1138 * method; the caller is expected to do that.
1140 * XXX probably should be called m_tag_init, but that was already taken.
1142 static __inline void
1143 m_tag_setup(struct m_tag *t, u_int32_t cookie, int type, int len)
1148 t->m_tag_cookie = cookie;
1152 * Reclaim resources associated with a tag.
1154 static __inline void
1155 m_tag_free(struct m_tag *t)
1158 (*t->m_tag_free)(t);
1162 * Return the first tag associated with an mbuf.
1164 static __inline struct m_tag *
1165 m_tag_first(struct mbuf *m)
1168 return (SLIST_FIRST(&m->m_pkthdr.tags));
1172 * Return the next tag in the list of tags associated with an mbuf.
1174 static __inline struct m_tag *
1175 m_tag_next(struct mbuf *m __unused, struct m_tag *t)
1178 return (SLIST_NEXT(t, m_tag_link));
1182 * Prepend a tag to the list of tags associated with an mbuf.
1184 static __inline void
1185 m_tag_prepend(struct mbuf *m, struct m_tag *t)
1188 SLIST_INSERT_HEAD(&m->m_pkthdr.tags, t, m_tag_link);
1192 * Unlink a tag from the list of tags associated with an mbuf.
1194 static __inline void
1195 m_tag_unlink(struct mbuf *m, struct m_tag *t)
1198 SLIST_REMOVE(&m->m_pkthdr.tags, t, m_tag, m_tag_link);
1201 /* These are for OpenBSD compatibility. */
1202 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
1204 static __inline struct m_tag *
1205 m_tag_get(int type, int length, int wait)
1207 return (m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait));
1210 static __inline struct m_tag *
1211 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
1213 return (SLIST_EMPTY(&m->m_pkthdr.tags) ? (struct m_tag *)NULL :
1214 m_tag_locate(m, MTAG_ABI_COMPAT, type, start));
1217 static __inline struct mbuf *
1218 m_free(struct mbuf *m)
1220 struct mbuf *n = m->m_next;
1222 MBUF_PROBE1(m__free, m);
1223 if ((m->m_flags & (M_PKTHDR|M_NOFREE)) == (M_PKTHDR|M_NOFREE))
1224 m_tag_delete_chain(m, NULL);
1225 if (m->m_flags & M_EXT)
1227 else if ((m->m_flags & M_NOFREE) == 0)
1228 uma_zfree(zone_mbuf, m);
1233 rt_m_getfib(struct mbuf *m)
1235 KASSERT(m->m_flags & M_PKTHDR , ("Attempt to get FIB from non header mbuf."));
1236 return (m->m_pkthdr.fibnum);
1239 #define M_GETFIB(_m) rt_m_getfib(_m)
1241 #define M_SETFIB(_m, _fib) do { \
1242 KASSERT((_m)->m_flags & M_PKTHDR, ("Attempt to set FIB on non header mbuf.")); \
1243 ((_m)->m_pkthdr.fibnum) = (_fib); \
1246 /* flags passed as first argument for "m_ether_tcpip_hash()" */
1247 #define MBUF_HASHFLAG_L2 (1 << 2)
1248 #define MBUF_HASHFLAG_L3 (1 << 3)
1249 #define MBUF_HASHFLAG_L4 (1 << 4)
1251 /* mbuf hashing helper routines */
1252 uint32_t m_ether_tcpip_hash_init(void);
1253 uint32_t m_ether_tcpip_hash(const uint32_t, const struct mbuf *, const uint32_t);
1255 #ifdef MBUF_PROFILING
1256 void m_profile(struct mbuf *m);
1257 #define M_PROFILE(m) m_profile(m)
1259 #define M_PROFILE(m)
1263 STAILQ_HEAD(, mbuf) mq_head;
1269 mbufq_init(struct mbufq *mq, int maxlen)
1272 STAILQ_INIT(&mq->mq_head);
1273 mq->mq_maxlen = maxlen;
1277 static inline struct mbuf *
1278 mbufq_flush(struct mbufq *mq)
1282 m = STAILQ_FIRST(&mq->mq_head);
1283 STAILQ_INIT(&mq->mq_head);
1289 mbufq_drain(struct mbufq *mq)
1293 n = mbufq_flush(mq);
1294 while ((m = n) != NULL) {
1295 n = STAILQ_NEXT(m, m_stailqpkt);
1300 static inline struct mbuf *
1301 mbufq_first(const struct mbufq *mq)
1304 return (STAILQ_FIRST(&mq->mq_head));
1307 static inline struct mbuf *
1308 mbufq_last(const struct mbufq *mq)
1311 return (STAILQ_LAST(&mq->mq_head, mbuf, m_stailqpkt));
1315 mbufq_full(const struct mbufq *mq)
1318 return (mq->mq_len >= mq->mq_maxlen);
1322 mbufq_len(const struct mbufq *mq)
1325 return (mq->mq_len);
1329 mbufq_enqueue(struct mbufq *mq, struct mbuf *m)
1334 STAILQ_INSERT_TAIL(&mq->mq_head, m, m_stailqpkt);
1339 static inline struct mbuf *
1340 mbufq_dequeue(struct mbufq *mq)
1344 m = STAILQ_FIRST(&mq->mq_head);
1346 STAILQ_REMOVE_HEAD(&mq->mq_head, m_stailqpkt);
1347 m->m_nextpkt = NULL;
1354 mbufq_prepend(struct mbufq *mq, struct mbuf *m)
1357 STAILQ_INSERT_HEAD(&mq->mq_head, m, m_stailqpkt);
1362 * Note: this doesn't enforce the maximum list size for dst.
1365 mbufq_concat(struct mbufq *mq_dst, struct mbufq *mq_src)
1368 mq_dst->mq_len += mq_src->mq_len;
1369 STAILQ_CONCAT(&mq_dst->mq_head, &mq_src->mq_head);
1373 #ifdef _SYS_TIMESPEC_H_
1375 mbuf_tstmp2timespec(struct mbuf *m, struct timespec *ts)
1378 KASSERT((m->m_flags & M_PKTHDR) != 0, ("mbuf %p no M_PKTHDR", m));
1379 KASSERT((m->m_flags & M_TSTMP) != 0, ("mbuf %p no M_TSTMP", m));
1380 ts->tv_sec = m->m_pkthdr.rcv_tstmp / 1000000000;
1381 ts->tv_nsec = m->m_pkthdr.rcv_tstmp % 1000000000;
1386 /* Invoked from the netdump client code. */
1387 void netdump_mbuf_drain(void);
1388 void netdump_mbuf_dump(void);
1389 void netdump_mbuf_reinit(int nmbuf, int nclust, int clsize);
1392 #endif /* _KERNEL */
1393 #endif /* !_SYS_MBUF_H_ */