38#include "opt_mbuf_stress_test.h"
39#include "opt_mbuf_profiling.h"
43#include <sys/kernel.h>
44#include <sys/limits.h>
46#include <sys/malloc.h>
48#include <sys/sysctl.h>
49#include <sys/domain.h>
50#include <sys/protosw.h>
52#include <sys/vmmeter.h>
56#include <vm/vm_pageout.h>
57#include <vm/vm_page.h>
60 "struct mbuf *",
"mbufinfo_t *",
61 "uint32_t",
"uint32_t",
62 "uint16_t",
"uint16_t",
63 "uint32_t",
"uint32_t",
64 "uint32_t",
"uint32_t");
67 "uint32_t",
"uint32_t",
68 "uint16_t",
"uint16_t",
69 "struct mbuf *",
"mbufinfo_t *");
72 "uint32_t",
"uint32_t",
73 "uint16_t",
"uint16_t",
74 "struct mbuf *",
"mbufinfo_t *");
77 "uint32_t",
"uint32_t",
78 "uint16_t",
"uint16_t",
79 "struct mbuf *",
"mbufinfo_t *");
82 "uint32_t",
"uint32_t",
83 "uint16_t",
"uint16_t",
84 "struct mbuf *",
"mbufinfo_t *");
87 "uint32_t",
"uint32_t",
88 "uint16_t",
"uint16_t",
89 "uint32_t",
"uint32_t",
90 "struct mbuf *",
"mbufinfo_t *");
93 "uint32_t",
"uint32_t",
94 "uint16_t",
"uint16_t",
95 "uint32_t",
"uint32_t",
96 "uint32_t",
"uint32_t",
97 "struct mbuf *",
"mbufinfo_t *");
100 "struct mbuf *",
"mbufinfo_t *",
101 "uint32_t",
"uint32_t",
102 "uint32_t",
"uint32_t");
105 "struct mbuf *",
"mbufinfo_t *",
106 "uint32_t",
"uint32_t",
107 "uint32_t",
"uint32_t",
113 "struct mbuf *",
"mbufinfo_t *");
116 "struct mbuf *",
"mbufinfo_t *");
118#include <security/mac/mac_framework.h>
124#ifdef MBUF_STRESS_TEST
129int m_defragrandomfailures;
136 &
max_linkhdr, 0,
"Size of largest link layer header");
138 &
max_protohdr, 0,
"Size of largest protocol layer header");
140 &
max_hdr, 0,
"Size of largest link plus protocol header");
142 &
max_datalen, 0,
"Minimum space left in mbuf after max_hdr");
143#ifdef MBUF_STRESS_TEST
144SYSCTL_INT(_kern_ipc, OID_AUTO, m_defragpackets, CTLFLAG_RD,
145 &m_defragpackets, 0,
"");
146SYSCTL_INT(_kern_ipc, OID_AUTO, m_defragbytes, CTLFLAG_RD,
147 &m_defragbytes, 0,
"");
148SYSCTL_INT(_kern_ipc, OID_AUTO, m_defraguseless, CTLFLAG_RD,
149 &m_defraguseless, 0,
"");
150SYSCTL_INT(_kern_ipc, OID_AUTO, m_defragfailure, CTLFLAG_RD,
151 &m_defragfailure, 0,
"");
152SYSCTL_INT(_kern_ipc, OID_AUTO, m_defragrandomfailures, CTLFLAG_RW,
153 &m_defragrandomfailures, 0,
"");
160CTASSERT(MSIZE - offsetof(
struct mbuf, m_dat) == MLEN);
161CTASSERT(MSIZE - offsetof(
struct mbuf, m_pktdat) == MHLEN);
182CTASSERT(offsetof(
struct mbuf, m_dat) == 32);
183CTASSERT(
sizeof(
struct pkthdr) == 56);
184CTASSERT(
sizeof(
struct m_ext) == 160);
188#if defined(__powerpc__) && defined(BOOKE)
190CTASSERT(
sizeof(
struct m_ext) == 184);
201static struct mbuf __used m_assertbuf;
202CTASSERT(
sizeof(m_assertbuf.m_slist) ==
sizeof(m_assertbuf.m_next));
203CTASSERT(
sizeof(m_assertbuf.m_stailq) ==
sizeof(m_assertbuf.m_next));
204CTASSERT(
sizeof(m_assertbuf.m_slistpkt) ==
sizeof(m_assertbuf.m_nextpkt));
205CTASSERT(
sizeof(m_assertbuf.m_stailqpkt) ==
sizeof(m_assertbuf.m_nextpkt));
215 volatile u_int *refcnt;
217 KASSERT(m->m_flags & (M_EXT|M_EXTPG),
218 (
"%s: M_EXT|M_EXTPG not set on %p", __func__, m));
219 KASSERT(!(n->m_flags & (M_EXT|M_EXTPG)),
220 (
"%s: M_EXT|M_EXTPG set on %p", __func__, n));
234 if (m->m_flags & M_EXTPG) {
235 bcopy(&m->m_epg_startcopy, &n->m_epg_startcopy,
236 __rangeof(
struct mbuf, m_epg_startcopy, m_epg_endcopy));
237 bcopy(&m->m_ext, &n->m_ext, m_epg_ext_copylen);
238 }
else if (m->m_ext.ext_type == EXT_EXTREF)
239 bcopy(&m->m_ext, &n->m_ext,
sizeof(
struct m_ext));
241 bcopy(&m->m_ext, &n->m_ext, m_ext_copylen);
243 n->m_flags |= m->m_flags & (M_RDONLY | M_EXT | M_EXTPG);
246 if (m->m_ext.ext_flags & EXT_FLAG_EMBREF) {
247 refcnt = n->m_ext.ext_cnt = &m->m_ext.ext_count;
248 n->m_ext.ext_flags &= ~EXT_FLAG_EMBREF;
250 KASSERT(m->m_ext.ext_cnt != NULL,
251 (
"%s: no refcounting pointer on %p", __func__, m));
252 refcnt = m->m_ext.ext_cnt;
258 atomic_add_int(refcnt, 1);
266 M_ASSERT_NO_SND_TAG(m);
269 m->m_flags &= ~M_PKTHDR;
270 bzero(&m->m_pkthdr,
sizeof(
struct pkthdr));
283 flags |= M_DEMOTEFLAGS;
285 for (m = all ? m0 : m0->m_next; m != NULL; m = m->m_next) {
286 KASSERT(m->m_nextpkt == NULL, (
"%s: m_nextpkt in m %p, m0 %p",
288 if (m->m_flags & M_PKTHDR)
309#define M_SANITY_ACTION(s) panic("mbuf %p: " s, m)
311#define M_SANITY_ACTION(s) printf("mbuf %p: " s, m)
314 for (m = m0; m != NULL; m = m->m_next) {
322 if ((caddr_t)m->m_data < a)
324 if ((caddr_t)m->m_data > b)
326 if ((caddr_t)m->m_data + m->m_len > b)
330 if (m != m0 && m->m_nextpkt != NULL) {
333 m->m_nextpkt = (
struct mbuf *)0xDEADC0DE;
339 if (m0->m_flags & M_PKTHDR)
343 if (m != m0 && m->m_flags & M_PKTHDR &&
344 !SLIST_EMPTY(&m->m_pkthdr.tags)) {
353 if (m != m0 && m->m_flags & M_PKTHDR) {
355 bzero(&m->m_pkthdr,
sizeof(m->m_pkthdr));
356 m->m_flags &= ~M_PKTHDR;
363 if (pktlen && pktlen != m->m_pkthdr.len) {
371#undef M_SANITY_ACTION
383 m->m_data = m->m_pktdat;
384 bzero(&m->m_pkthdr,
sizeof(m->m_pkthdr));
386 m->m_pkthdr.numa_domain = M_NODOM;
390 error = mac_mbuf_init(m, how);
410 KASSERT(SLIST_EMPTY(&to->m_pkthdr.tags),
411 (
"m_move_pkthdr: to has tags"));
417 if (to->m_flags & M_PKTHDR)
420 to->m_flags = (from->m_flags & M_COPYFLAGS) |
421 (to->m_flags & (M_EXT | M_EXTPG));
422 if ((to->m_flags & M_EXT) == 0)
423 to->m_data = to->m_pktdat;
424 to->m_pkthdr = from->m_pkthdr;
425 SLIST_INIT(&from->m_pkthdr.tags);
426 from->m_flags &= ~M_PKTHDR;
427 if (from->m_pkthdr.csum_flags & CSUM_SND_TAG) {
428 from->m_pkthdr.csum_flags &= ~CSUM_SND_TAG;
429 from->m_pkthdr.snd_tag = NULL;
452 KASSERT(SLIST_EMPTY(&to->m_pkthdr.tags), (
"m_dup_pkthdr: to has tags"));
454 MBUF_CHECKSLEEP(how);
456 if (to->m_flags & M_PKTHDR)
459 to->m_flags = (from->m_flags & M_COPYFLAGS) |
460 (to->m_flags & (M_EXT | M_EXTPG));
461 if ((to->m_flags & M_EXT) == 0)
462 to->m_data = to->m_pktdat;
463 to->m_pkthdr = from->m_pkthdr;
464 if (from->m_pkthdr.csum_flags & CSUM_SND_TAG)
465 m_snd_tag_ref(from->m_pkthdr.snd_tag);
466 SLIST_INIT(&to->m_pkthdr.tags);
480 if (m->m_flags & M_PKTHDR)
481 mn = m_gethdr(how, m->m_type);
483 mn = m_get(how, m->m_type);
488 if (m->m_flags & M_PKTHDR)
506m_copym(
struct mbuf *m,
int off0,
int len,
int wait)
508 struct mbuf *n, **np;
513 KASSERT(off >= 0, (
"m_copym, negative off %d", off));
514 KASSERT(len >= 0, (
"m_copym, negative len %d", len));
515 MBUF_CHECKSLEEP(wait);
516 if (off == 0 && m->m_flags & M_PKTHDR)
519 KASSERT(m != NULL, (
"m_copym, offset > size of mbuf chain"));
529 KASSERT(len == M_COPYALL,
530 (
"m_copym, length > size of mbuf chain"));
534 n = m_gethdr(wait, m->m_type);
536 n = m_get(wait, m->m_type);
543 if (len == M_COPYALL)
544 n->m_pkthdr.len -= off0;
546 n->m_pkthdr.len = len;
549 n->m_len = min(len, m->m_len - off);
550 if (m->m_flags & (M_EXT|M_EXTPG)) {
551 n->m_data = m->m_data + off;
554 bcopy(mtod(m, caddr_t)+off, mtod(n, caddr_t),
556 if (len != M_COPYALL)
581 struct mbuf *top, *n, *o;
583 MBUF_CHECKSLEEP(how);
584 n = m_get(how, m->m_type);
592 if (m->m_flags & (M_EXT|M_EXTPG)) {
593 n->m_data = m->m_data;
596 n->m_data = n->m_pktdat + (m->m_data - m->m_pktdat );
597 bcopy(mtod(m,
char *), mtod(n,
char *), n->m_len);
602 o = m_get(how, m->m_type);
610 if (m->m_flags & (M_EXT|M_EXTPG)) {
611 n->m_data = m->m_data;
614 bcopy(mtod(m,
char *), mtod(n,
char *), n->m_len);
630 int error __diagused;
632 KASSERT(off >= 0, (
"m_copyfromunmapped: negative off %d", off));
633 KASSERT(len >= 0, (
"m_copyfromunmapped: negative len %d", len));
634 KASSERT(off < m->m_len,
635 (
"m_copyfromunmapped: len exceeds mbuf length"));
640 uio.uio_segflg = UIO_SYSSPACE;
643 uio.uio_rw = UIO_READ;
645 KASSERT(error == 0, (
"m_unmapped_uiomove failed: off %d, len %d", off,
654m_copydata(
const struct mbuf *m,
int off,
int len, caddr_t cp)
658 KASSERT(off >= 0, (
"m_copydata, negative off %d", off));
659 KASSERT(len >= 0, (
"m_copydata, negative len %d", len));
661 KASSERT(m != NULL, (
"m_copydata, offset > size of mbuf chain"));
668 KASSERT(m != NULL, (
"m_copydata, length > size of mbuf chain"));
669 count = min(m->m_len - off, len);
670 if ((m->m_flags & M_EXTPG) != 0)
673 bcopy(mtod(m, caddr_t) + off, cp,
count);
689 struct mbuf **p, *top = NULL;
690 int remain, moff, nsize;
692 MBUF_CHECKSLEEP(how);
699 remain = m->m_pkthdr.len;
702 while (remain > 0 || top == NULL) {
706 if (remain >= MINCLSIZE) {
707 n = m_getcl(how, m->m_type, 0);
710 n = m_get(how, m->m_type);
721 if ((n->m_flags & M_EXT) == 0)
723 n->m_flags &= ~M_RDONLY;
732 while (n->m_len < nsize && m != NULL) {
733 int chunk = min(nsize - n->m_len, m->m_len - moff);
735 m_copydata(m, moff, chunk, n->m_data + n->m_len);
739 if (moff == m->m_len) {
746 KASSERT((remain > 0 && m != NULL) || (remain == 0 && m == NULL),
747 (
"%s: bogus m_pkthdr.len", __func__));
762m_cat(
struct mbuf *m,
struct mbuf *n)
767 if (!M_WRITABLE(m) ||
768 (n->m_flags & M_EXTPG) != 0 ||
769 M_TRAILINGSPACE(m) < n->m_len) {
775 bcopy(mtod(n, caddr_t), mtod(m, caddr_t) + m->m_len,
777 m->m_len += n->m_len;
792 m->m_pkthdr.len += n->m_pkthdr.len;
805 if ((m = mp) == NULL)
811 while (m != NULL && len > 0) {
812 if (m->m_len <= len) {
822 if (mp->m_flags & M_PKTHDR)
823 mp->m_pkthdr.len -= (req_len - len);
836 if (m->m_next == (
struct mbuf *)0)
840 if (m->m_len >= len) {
842 if (mp->m_flags & M_PKTHDR)
843 mp->m_pkthdr.len -= len;
855 if (m->m_flags & M_PKTHDR)
856 m->m_pkthdr.len =
count;
857 for (; m; m = m->m_next) {
858 if (m->m_len >=
count) {
860 if (m->m_next != NULL) {
877 if ((mp->m_flags & M_PKTHDR) != 0) {
885 rsstype = mp->m_pkthdr.rsstype;
886 if ((rsstype & M_HASHTYPE_INNER) != 0) {
887 M_HASHTYPE_SET(mp, rsstype & ~M_HASHTYPE_INNER);
889 M_HASHTYPE_CLEAR(mp);
909 KASSERT((n->m_flags & M_EXTPG) == 0,
910 (
"%s: unmapped mbuf %p", __func__, n));
917 if ((n->m_flags & M_EXT) == 0 &&
918 n->m_data + len < &n->m_dat[MLEN] && n->m_next) {
927 m = m_get(M_NOWAIT, n->m_type);
930 if (n->m_flags & M_PKTHDR)
933 space = &m->m_dat[MLEN] - (m->m_data + m->m_len);
936 bcopy(mtod(n, caddr_t), mtod(m, caddr_t) + m->m_len,
946 }
while (len > 0 && n);
969 if (len > (MHLEN - dstoff))
971 m = m_get(M_NOWAIT, n->m_type);
974 if (n->m_flags & M_PKTHDR)
977 space = &m->m_dat[MLEN] - (m->m_data + m->m_len);
980 memcpy(mtod(m, caddr_t) + m->m_len, mtod(n, caddr_t),
990 }
while (len > 0 && n);
1016 u_int len = len0, remain;
1018 MBUF_CHECKSLEEP(wait);
1019 for (m = m0; m && len > m->m_len; m = m->m_next)
1023 remain = m->m_len - len;
1024 if (m0->m_flags & M_PKTHDR && remain == 0) {
1025 n = m_gethdr(wait, m0->m_type);
1028 n->m_next = m->m_next;
1030 if (m0->m_pkthdr.csum_flags & CSUM_SND_TAG) {
1031 n->m_pkthdr.snd_tag =
1032 m_snd_tag_ref(m0->m_pkthdr.snd_tag);
1033 n->m_pkthdr.csum_flags |= CSUM_SND_TAG;
1035 n->m_pkthdr.rcvif = m0->m_pkthdr.rcvif;
1036 n->m_pkthdr.len = m0->m_pkthdr.len - len0;
1037 m0->m_pkthdr.len = len0;
1039 }
else if (m0->m_flags & M_PKTHDR) {
1040 n = m_gethdr(wait, m0->m_type);
1043 if (m0->m_pkthdr.csum_flags & CSUM_SND_TAG) {
1044 n->m_pkthdr.snd_tag =
1045 m_snd_tag_ref(m0->m_pkthdr.snd_tag);
1046 n->m_pkthdr.csum_flags |= CSUM_SND_TAG;
1048 n->m_pkthdr.rcvif = m0->m_pkthdr.rcvif;
1049 n->m_pkthdr.len = m0->m_pkthdr.len - len0;
1050 m0->m_pkthdr.len = len0;
1051 if (m->m_flags & (M_EXT|M_EXTPG))
1053 if (remain > MHLEN) {
1056 n->m_next =
m_split(m, len, wait);
1057 if (n->m_next == NULL) {
1066 }
else if (remain == 0) {
1071 n = m_get(wait, m->m_type);
1077 if (m->m_flags & (M_EXT|M_EXTPG)) {
1078 n->m_data = m->m_data + len;
1081 bcopy(mtod(m, caddr_t) + len, mtod(n, caddr_t), remain);
1085 n->m_next = m->m_next;
1096 void (*copy)(
char *from, caddr_t to, u_int len))
1099 struct mbuf *top = NULL, **mp = ⊤
1102 if (off < 0 || off > MHLEN)
1105 while (totlen > 0) {
1107 if (totlen + off >= MINCLSIZE) {
1108 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
1111 m = m_gethdr(M_NOWAIT, MT_DATA);
1122 m->m_pkthdr.rcvif = ifp;
1123 m->m_pkthdr.len = totlen;
1125 if (totlen + off >= MINCLSIZE) {
1126 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1129 m = m_get(M_NOWAIT, MT_DATA);
1142 m->m_len = len = min(totlen, len);
1144 copy(
buf, mtod(m, caddr_t), (u_int)len);
1146 bcopy(
buf, mtod(m, caddr_t), (u_int)len);
1160 int error __diagused;
1162 KASSERT(off >= 0, (
"m_copytounmapped: negative off %d", off));
1163 KASSERT(len >= 0, (
"m_copytounmapped: negative len %d", len));
1164 KASSERT(off < m->m_len, (
"m_copytounmapped: len exceeds mbuf length"));
1165 iov.iov_base = __DECONST(caddr_t, cp);
1167 uio.uio_resid = len;
1169 uio.uio_segflg = UIO_SYSSPACE;
1172 uio.uio_rw = UIO_WRITE;
1174 KASSERT(error == 0, (
"m_unmapped_uiomove failed: off %d, len %d", off,
1187 struct mbuf *m = m0, *n;
1192 while (off > (mlen = m->m_len)) {
1195 if (m->m_next == NULL) {
1196 n = m_get(M_NOWAIT, m->m_type);
1199 bzero(mtod(n, caddr_t), MLEN);
1200 n->m_len = min(MLEN, len + off);
1206 if (m->m_next == NULL && (len > m->m_len - off)) {
1207 m->m_len += min(len - (m->m_len - off),
1208 M_TRAILINGSPACE(m));
1210 mlen = min (m->m_len - off, len);
1211 if ((m->m_flags & M_EXTPG) != 0)
1214 bcopy(cp, off + mtod(m, caddr_t), (u_int)mlen);
1222 if (m->m_next == NULL) {
1223 n = m_get(M_NOWAIT, m->m_type);
1226 n->m_len = min(MLEN, len);
1231out:
if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
1232 m->m_pkthdr.len = totlen;
1246 int remainder, space;
1248 for (m = m0; m->m_next != NULL; m = m->m_next)
1251 space = M_TRAILINGSPACE(m);
1256 if (space > remainder)
1258 bcopy(cp, mtod(m, caddr_t) + m->m_len, space);
1260 cp += space, remainder -= space;
1262 while (remainder > 0) {
1267 n = m_get(M_NOWAIT, m->m_type);
1270 n->m_len = min(MLEN, remainder);
1271 bcopy(cp, mtod(n, caddr_t), n->m_len);
1272 cp += n->m_len, remainder -= n->m_len;
1276 if (m0->m_flags & M_PKTHDR)
1277 m0->m_pkthdr.len += len - remainder;
1278 return (remainder == 0);
1283 int (*f)(
void *,
void *, u_int),
void *arg)
1286 u_int i,
count, pgoff, pglen;
1289 KASSERT(PMAP_HAS_DMAP,
1290 (
"m_apply_extpg_one does not support unmapped mbufs"));
1291 off += mtod(m, vm_offset_t);
1292 if (off < m->m_epg_hdrlen) {
1293 count = min(m->m_epg_hdrlen - off, len);
1294 rval = f(arg, m->m_epg_hdr + off,
count);
1300 off -= m->m_epg_hdrlen;
1301 pgoff = m->m_epg_1st_off;
1302 for (i = 0; i < m->m_epg_npgs && len > 0; i++) {
1303 pglen = m_epg_pagelen(m, i, pgoff);
1305 count = min(pglen - off, len);
1306 p = (
void *)PHYS_TO_DMAP(m->m_epg_pa[i] + pgoff + off);
1307 rval = f(arg, p,
count);
1317 KASSERT(off < m->m_epg_trllen,
1318 (
"m_apply_extpg_one: offset beyond trailer"));
1319 KASSERT(len <= m->m_epg_trllen - off,
1320 (
"m_apply_extpg_one: length beyond trailer"));
1321 return (f(arg, m->m_epg_trail + off, len));
1329 int (*f)(
void *,
void *, u_int),
void *arg)
1331 if ((m->m_flags & M_EXTPG) != 0)
1334 return (f(arg, mtod(m, caddr_t) + off, len));
1343 int (*f)(
void *,
void *, u_int),
void *arg)
1348 KASSERT(off >= 0, (
"m_apply, negative off %d", off));
1349 KASSERT(len >= 0, (
"m_apply, negative len %d", len));
1351 KASSERT(m != NULL, (
"m_apply, offset > size of mbuf chain"));
1358 KASSERT(m != NULL, (
"m_apply, offset > size of mbuf chain"));
1359 count = min(m->m_len - off, len);
1379 if (m->m_len > loc) {
1384 if (m->m_next == NULL) {
1403 const struct mbuf *m2;
1410 if (m->m_flags & M_PKTHDR)
1411 len = m->m_pkthdr.len;
1415 while (m2 != NULL && (len == -1 || len)) {
1417 if (maxlen != -1 && pdata > maxlen)
1419 printf(
"mbuf: %p len: %d, next: %p, %b%s", m2, m2->m_len,
1420 m2->m_next, m2->m_flags,
"\20\20freelist\17skipfw"
1421 "\11proto5\10proto4\7proto3\6proto2\5proto1\4rdonly"
1422 "\3eor\2pkthdr\1ext", pdata ?
"" :
"\n");
1424 printf(
", %*D\n", pdata, (u_char *)m2->m_data,
"-");
1430 printf(
"%d bytes unaccounted for.\n", len);
1440 m0->m_pkthdr.len = len;
1451 for (m = m0; m != NULL; m = m->m_next) {
1453 if (m->m_next == NULL)
1475 struct mbuf *m_new = NULL, *m_final = NULL;
1476 int progress = 0, length;
1478 MBUF_CHECKSLEEP(how);
1479 if (!(m0->m_flags & M_PKTHDR))
1484#ifdef MBUF_STRESS_TEST
1485 if (m_defragrandomfailures) {
1486 int temp = arc4random() & 0xff;
1492 if (m0->m_pkthdr.len > MHLEN)
1493 m_final = m_getcl(how, MT_DATA, M_PKTHDR);
1495 m_final = m_gethdr(how, MT_DATA);
1497 if (m_final == NULL)
1505 while (progress < m0->m_pkthdr.len) {
1506 length = m0->m_pkthdr.len - progress;
1507 if (length > MCLBYTES)
1510 if (m_new == NULL) {
1512 m_new = m_getcl(how, MT_DATA, 0);
1514 m_new = m_get(how, MT_DATA);
1519 m_copydata(m0, progress, length, mtod(m_new, caddr_t));
1521 m_new->m_len = length;
1522 if (m_new != m_final)
1523 m_cat(m_final, m_new);
1526#ifdef MBUF_STRESS_TEST
1527 if (m0->m_next == NULL)
1532#ifdef MBUF_STRESS_TEST
1534 m_defragbytes += m0->m_pkthdr.len;
1538#ifdef MBUF_STRESS_TEST
1559 if ((m->m_flags & M_EXTPG) == 0)
1570 if (m->m_epg_hdrlen != 0)
1572 frags += m->m_epg_npgs;
1573 if (m->m_epg_trllen != 0)
1591 struct mbuf *m, *n, *n2, **prev;
1598 for (m = m0; m != NULL; m = m->m_next)
1612 if (M_WRITABLE(m) &&
1613 n->m_len < M_TRAILINGSPACE(m)) {
1615 mtod(m,
char *) + m->m_len);
1616 m->m_len += n->m_len;
1617 m->m_next = n->m_next;
1620 if (curfrags <= maxfrags)
1625 KASSERT(maxfrags > 1,
1626 (
"maxfrags %u, but normal collapse failed", maxfrags));
1631 while ((n = *prev) != NULL) {
1632 if ((n2 = n->m_next) != NULL &&
1633 n->m_len + n2->m_len < MCLBYTES) {
1634 m = m_getcl(how, MT_DATA, 0);
1639 mtod(m,
char *) + n->m_len);
1640 m->m_len = n->m_len + n2->m_len;
1641 m->m_next = n2->m_next;
1648 if (curfrags <= maxfrags)
1669#ifdef MBUF_STRESS_TEST
1687m_fragment(
struct mbuf *m0,
int how,
int length)
1689 struct mbuf *m_first, *m_last;
1690 int divisor = 255, progress = 0, fraglen;
1692 if (!(m0->m_flags & M_PKTHDR))
1695 if (length == 0 || length < -2)
1697 if (length > MCLBYTES)
1699 if (length < 0 && divisor > MCLBYTES)
1702 length = 1 + (arc4random() % divisor);
1708 m_first = m_getcl(how, MT_DATA, M_PKTHDR);
1709 if (m_first == NULL)
1717 while (progress < m0->m_pkthdr.len) {
1719 fraglen = 1 + (arc4random() % divisor);
1720 if (fraglen > m0->m_pkthdr.len - progress)
1721 fraglen = m0->m_pkthdr.len - progress;
1723 if (progress != 0) {
1724 struct mbuf *m_new = m_getcl(how, MT_DATA, 0);
1728 m_last->m_next = m_new;
1732 m_copydata(m0, progress, fraglen, mtod(m_last, caddr_t));
1733 progress += fraglen;
1734 m_last->m_len = fraglen;
1759 for (
int i = 0; i < m->m_epg_npgs; i++) {
1760 pg = PHYS_TO_VM_PAGE(m->m_epg_pa[i]);
1761 vm_page_unwire_noq(pg);
1769 struct mbuf *m, *mb, *prev;
1770 vm_page_t pg_array[MBUF_PEXT_MAX_PGS];
1771 int error, length, i, needed;
1773 int pflags = malloc2vm_flags(how) | VM_ALLOC_NODUMP | VM_ALLOC_WIRED;
1775 MPASS((
flags & M_PKTHDR) == 0);
1776 MPASS((how & M_ZERO) == 0);
1783 total = MIN(uio->uio_resid, len);
1785 total = uio->uio_resid;
1788 maxseg = MBUF_PEXT_MAX_PGS * PAGE_SIZE;
1796 if (__predict_false(total == 0)) {
1800 mb->m_epg_flags = EPG_FLAG_ANON;
1817 mb->m_epg_flags = EPG_FLAG_ANON;
1818 needed = length = MIN(maxseg, total);
1819 for (i = 0; needed > 0; i++, needed -= PAGE_SIZE) {
1821 pg_array[i] = vm_page_alloc_noobj(pflags);
1822 if (pg_array[i] == NULL) {
1823 if (how & M_NOWAIT) {
1830 mb->m_epg_pa[i] = VM_PAGE_TO_PHYS(pg_array[i]);
1833 mb->m_epg_last_len = length - PAGE_SIZE * (mb->m_epg_npgs - 1);
1834 MBUF_EXT_PGS_ASSERT_SANITY(mb);
1836 error = uiomove_fromphys(pg_array, 0, length, uio);
1840 mb->m_ext.ext_size += PAGE_SIZE * mb->m_epg_npgs;
1841 if (
flags & M_PKTHDR)
1842 m->m_pkthdr.len += length;
1857 struct mbuf *m, *mb;
1862 if (
flags & M_EXTPG)
1870 total = (uio->uio_resid < len) ? uio->uio_resid : len;
1872 total = uio->uio_resid;
1885 m =
m_getm2(NULL, max(total + align, 1), how, MT_DATA,
flags);
1891 for (mb = m; mb != NULL; mb = mb->m_next) {
1892 length = min(M_TRAILINGSPACE(mb), total - progress);
1894 error =
uiomove(mtod(mb,
void *), length, uio);
1902 if (
flags & M_PKTHDR)
1903 m->m_pkthdr.len += length;
1905 KASSERT(progress == total, (
"%s: progress != total", __func__));
1917 int error, i, off, pglen, pgoff, seglen, segoff;
1923 off = mtod(m, vm_offset_t);
1926 if (m->m_epg_hdrlen != 0) {
1927 if (off >= m->m_epg_hdrlen) {
1928 off -= m->m_epg_hdrlen;
1930 seglen = m->m_epg_hdrlen - off;
1932 seglen = min(seglen, len);
1935 error =
uiomove(__DECONST(
void *,
1936 &m->m_epg_hdr[segoff]), seglen, uio);
1939 pgoff = m->m_epg_1st_off;
1940 for (i = 0; i < m->m_epg_npgs && error == 0 && len > 0; i++) {
1941 pglen = m_epg_pagelen(m, i, pgoff);
1947 seglen = pglen - off;
1948 segoff = pgoff + off;
1950 seglen = min(seglen, len);
1952 pg = PHYS_TO_VM_PAGE(m->m_epg_pa[i]);
1953 error = uiomove_fromphys(&pg, segoff, seglen, uio);
1956 if (len != 0 && error == 0) {
1957 KASSERT((off + len) <= m->m_epg_trllen,
1958 (
"off + len > trail (%d + %d > %d, m_off = %d)", off, len,
1959 m->m_epg_trllen, m_off));
1960 error =
uiomove(__DECONST(
void *, &m->m_epg_trail[off]),
1972 int error, length, total;
1976 total = min(uio->uio_resid, len);
1978 total = uio->uio_resid;
1981 for (; m != NULL; m = m->m_next) {
1982 length = min(m->m_len, total - progress);
1984 if ((m->m_flags & M_EXTPG) != 0)
1987 error =
uiomove(mtod(m,
void *), length, uio);
2009 struct mbuf *m, *mprev;
2010 struct mbuf *n, *mfirst, *mlast;
2014 for (m = m0; m != NULL; m = mprev->m_next) {
2027 if ((m->m_flags & M_EXT) == 0) {
2028 if (mprev && (mprev->m_flags & M_EXT) &&
2029 m->m_len <= M_TRAILINGSPACE(mprev)) {
2031 memcpy(mtod(mprev, caddr_t) + mprev->m_len,
2032 mtod(m, caddr_t), m->m_len);
2033 mprev->m_len += m->m_len;
2034 mprev->m_next = m->m_next;
2044 if (M_WRITABLE(m)) {
2055 KASSERT(m->m_flags & M_EXT, (
"m_flags 0x%x", m->m_flags));
2057 if (mprev != NULL && (mprev->m_flags & M_EXT) &&
2058 m->m_len <= M_TRAILINGSPACE(mprev)) {
2060 memcpy(mtod(mprev, caddr_t) + mprev->m_len,
2061 mtod(m, caddr_t), m->m_len);
2062 mprev->m_len += m->m_len;
2063 mprev->m_next = m->m_next;
2076 n = m_getcl(how, m->m_type, m->m_flags & M_COPYFLAGS);
2081 if (m->m_flags & M_PKTHDR) {
2082 KASSERT(mprev == NULL, (
"%s: m0 %p, m %p has M_PKTHDR",
2091 int cc = min(len, MCLBYTES);
2092 memcpy(mtod(n, caddr_t), mtod(m, caddr_t) + off, cc);
2098 newipsecstat.ips_clcopied++;
2106 n = m_getcl(how, m->m_type, m->m_flags & M_COPYFLAGS);
2113 n->m_next = m->m_next;
2117 mprev->m_next = mfirst;
2124#ifdef MBUF_PROFILING
2126#define MP_BUCKETS 32
2128 uintmax_t wasted[MP_BUCKETS];
2129 uintmax_t used[MP_BUCKETS];
2130 uintmax_t segments[MP_BUCKETS];
2134m_profile(
struct mbuf *m)
2143 if (m->m_flags & M_EXT) {
2144 wasted += MHLEN -
sizeof(m->m_ext) +
2145 m->m_ext.ext_size - m->m_len;
2147 if (m->m_flags & M_PKTHDR)
2148 wasted += MHLEN - m->m_len;
2150 wasted += MLEN - m->m_len;
2155 if (segments > MP_BUCKETS - 1)
2156 segments = MP_BUCKETS - 1;
2159 if (wasted > 100000)
2163 mbprof.segments[segments]++;
2164 mbprof.used[fls(used)]++;
2165 mbprof.wasted[fls(wasted)]++;
2169mbprof_handler(SYSCTL_HANDLER_ARGS)
2178 p = &mbprof.wasted[0];
2181 "%ju %ju %ju %ju %ju %ju %ju %ju "
2182 "%ju %ju %ju %ju %ju %ju %ju %ju\n",
2183 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
2184 p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
2186 p = &mbprof.wasted[16];
2188 "%ju %ju %ju %ju %ju %ju %ju %ju "
2189 "%ju %ju %ju %ju %ju %ju %ju %ju\n",
2190 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
2191 p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
2193 p = &mbprof.used[0];
2196 "%ju %ju %ju %ju %ju %ju %ju %ju "
2197 "%ju %ju %ju %ju %ju %ju %ju %ju\n",
2198 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
2199 p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
2201 p = &mbprof.used[16];
2203 "%ju %ju %ju %ju %ju %ju %ju %ju "
2204 "%ju %ju %ju %ju %ju %ju %ju %ju\n",
2205 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
2206 p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
2208 p = &mbprof.segments[0];
2211 "%ju %ju %ju %ju %ju %ju %ju %ju "
2212 "%ju %ju %ju %ju %ju %ju %ju %ju\n",
2213 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
2214 p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
2216 p = &mbprof.segments[16];
2218 "%ju %ju %ju %ju %ju %ju %ju %ju "
2219 "%ju %ju %ju %ju %ju %ju %ju %jju",
2220 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
2221 p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
2230mbprof_clr_handler(SYSCTL_HANDLER_ARGS)
2236 if (error || !req->newptr)
2240 bzero(&mbprof,
sizeof(mbprof));
2247 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
2248 mbprof_handler,
"A",
2249 "mbuf profiling statistics");
2252 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0,
2253 mbprof_clr_handler,
"I",
2254 "clear mbuf profiling statistics");
SYSCTL_PROC(_kern_binmisc, OID_AUTO, add, CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ADD, sysctl_kern_binmisc, "S,ximgact_binmisc_entry", "Add an activator entry")
void m_freem(struct mbuf *mb)
struct mbuf * mb_alloc_ext_pgs(int how, m_ext_free_t ext_free)
struct mbuf * m_getm2(struct mbuf *m, int len, int how, short type, int flags)
int sysctl_handle_int(SYSCTL_HANDLER_ARGS)
struct sbuf * sbuf_new_for_sysctl(struct sbuf *s, char *buf, int length, struct sysctl_req *req)
int printf(const char *fmt,...)
int sbuf_finish(struct sbuf *s)
void sbuf_delete(struct sbuf *s)
int sbuf_printf(struct sbuf *s, const char *fmt,...)
int uiomove(void *cp, int n, struct uio *uio)
void m_tag_delete_chain(struct mbuf *m, struct m_tag *t)
int m_tag_copy_chain(struct mbuf *to, const struct mbuf *from, int how)
int m_pkthdr_init(struct mbuf *m, int how)
CTASSERT(MSIZE - offsetof(struct mbuf, m_dat)==MLEN)
void m_demote(struct mbuf *m0, int all, int flags)
void mb_free_mext_pgs(struct mbuf *m)
SDT_PROBE_DEFINE3_XLATE(sdt,,, m__gethdr_raw, "uint32_t", "uint32_t", "uint16_t", "uint16_t", "struct mbuf *", "mbufinfo_t *")
struct mbuf * m_dup(const struct mbuf *m, int how)
void m_adj_decap(struct mbuf *mp, int len)
static int frags_per_mbuf(struct mbuf *m)
SDT_PROBE_DEFINE5_XLATE(sdt,,, m__init, "struct mbuf *", "mbufinfo_t *", "uint32_t", "uint32_t", "uint16_t", "uint16_t", "uint32_t", "uint32_t", "uint32_t", "uint32_t")
SDT_PROBE_DEFINE(sdt,,, m__cljset)
void m_copydata(const struct mbuf *m, int off, int len, caddr_t cp)
int m_dup_pkthdr(struct mbuf *to, const struct mbuf *from, int how)
u_int m_length(struct mbuf *m0, struct mbuf **last)
int m_unmapped_uiomove(const struct mbuf *m, int m_off, struct uio *uio, int len)
void m_cat(struct mbuf *m, struct mbuf *n)
struct mbuf * m_copym(struct mbuf *m, int off0, int len, int wait)
struct mbuf * m_getptr(struct mbuf *m, int loc, int *off)
void mb_dupcl(struct mbuf *n, struct mbuf *m)
struct mbuf * m_defrag(struct mbuf *m0, int how)
int m_apply(struct mbuf *m, int off, int len, int(*f)(void *, void *, u_int), void *arg)
int m_mbuftouio(struct uio *uio, const struct mbuf *m, int len)
void m_catpkt(struct mbuf *m, struct mbuf *n)
struct mbuf * m_prepend(struct mbuf *m, int len, int how)
int m_append(struct mbuf *m0, int len, c_caddr_t cp)
SDT_PROBE_DEFINE1_XLATE(sdt,,, m__free, "struct mbuf *", "mbufinfo_t *")
SYSCTL_INT(_kern_ipc, KIPC_MAX_LINKHDR, max_linkhdr, CTLFLAG_RD, &max_linkhdr, 0, "Size of largest link layer header")
void m_print(const struct mbuf *m, int maxlen)
struct mbuf * m_split(struct mbuf *m0, int len0, int wait)
static void m_copytounmapped(const struct mbuf *m, int off, int len, c_caddr_t cp)
static int m_apply_one(struct mbuf *m, int off, int len, int(*f)(void *, void *, u_int), void *arg)
int m_sanity(struct mbuf *m0, int sanitize)
static void m_copyfromunmapped(const struct mbuf *m, int off, int len, caddr_t cp)
struct mbuf * m_devget(char *buf, int totlen, int off, struct ifnet *ifp, void(*copy)(char *from, caddr_t to, u_int len))
void m_demote_pkthdr(struct mbuf *m)
struct mbuf * m_unshare(struct mbuf *m0, int how)
static struct mbuf * m_uiotombuf_nomap(struct uio *uio, int how, int len, int maxseg, int flags)
SDT_PROBE_DEFINE4_XLATE(sdt,,, m__getcl, "uint32_t", "uint32_t", "uint16_t", "uint16_t", "uint32_t", "uint32_t", "struct mbuf *", "mbufinfo_t *")
void m_copyback(struct mbuf *m0, int off, int len, c_caddr_t cp)
struct mbuf * m_pullup(struct mbuf *n, int len)
void m_adj(struct mbuf *mp, int req_len)
static int m_apply_extpg_one(struct mbuf *m, int off, int len, int(*f)(void *, void *, u_int), void *arg)
void m_move_pkthdr(struct mbuf *to, struct mbuf *from)
struct mbuf * m_collapse(struct mbuf *m0, int how, int maxfrags)
u_int m_fixhdr(struct mbuf *m0)
struct mbuf * m_copyup(struct mbuf *n, int len, int dstoff)
struct mbuf * m_copypacket(struct mbuf *m, int how)
struct mbuf * m_uiotombuf(struct uio *uio, int how, int len, int align, int flags)
#define M_SANITY_ACTION(s)