| uipc_mbuf.c (276910) | uipc_mbuf.c (277203) |
|---|---|
| 1/*- 2 * Copyright (c) 1982, 1986, 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 16 unchanged lines hidden (view full) --- 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94 30 */ 31 32#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 1982, 1986, 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 16 unchanged lines hidden (view full) --- 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94 30 */ 31 32#include <sys/cdefs.h> |
| 33__FBSDID("$FreeBSD: head/sys/kern/uipc_mbuf.c 276910 2015-01-10 10:41:23Z rwatson $"); | 33__FBSDID("$FreeBSD: head/sys/kern/uipc_mbuf.c 277203 2015-01-14 23:44:00Z rwatson $"); |
| 34 35#include "opt_param.h" 36#include "opt_mbuf_stress_test.h" 37#include "opt_mbuf_profiling.h" 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/kernel.h> --- 41 unchanged lines hidden (view full) --- 83SYSCTL_INT(_kern_ipc, OID_AUTO, m_defragrandomfailures, CTLFLAG_RW, 84 &m_defragrandomfailures, 0, ""); 85#endif 86 87/* 88 * Ensure the correct size of various mbuf parameters. It could be off due 89 * to compiler-induced padding and alignment artifacts. 90 */ | 34 35#include "opt_param.h" 36#include "opt_mbuf_stress_test.h" 37#include "opt_mbuf_profiling.h" 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/kernel.h> --- 41 unchanged lines hidden (view full) --- 83SYSCTL_INT(_kern_ipc, OID_AUTO, m_defragrandomfailures, CTLFLAG_RW, 84 &m_defragrandomfailures, 0, ""); 85#endif 86 87/* 88 * Ensure the correct size of various mbuf parameters. It could be off due 89 * to compiler-induced padding and alignment artifacts. 90 */ |
| 91CTASSERT(sizeof(struct mbuf) == MSIZE); | |
| 92CTASSERT(MSIZE - offsetof(struct mbuf, m_dat) == MLEN); 93CTASSERT(MSIZE - offsetof(struct mbuf, m_pktdat) == MHLEN); 94 95/* | 91CTASSERT(MSIZE - offsetof(struct mbuf, m_dat) == MLEN); 92CTASSERT(MSIZE - offsetof(struct mbuf, m_pktdat) == MHLEN); 93 94/* |
| 95 * mbuf data storage should be 64-bit aligned regardless of architectural 96 * pointer size; check this is the case with and without a packet header. 97 */ 98CTASSERT(offsetof(struct mbuf, m_dat) % 8 == 0); 99CTASSERT(offsetof(struct mbuf, m_pktdat) % 8 == 0); 100 101/* 102 * While the specific values here don't matter too much (i.e., +/- a few 103 * words), we do want to ensure that changes to these values are carefully 104 * reasoned about and properly documented. This is especially the case as 105 * network-protocol and device-driver modules encode these layouts, and must 106 * be recompiled if the structures change. Check these values at compile time 107 * against the ones documented in comments in mbuf.h. 108 * 109 * NB: Possibly they should be documented there via #define's and not just 110 * comments. 111 */ 112#if defined(__LP64__) 113CTASSERT(offsetof(struct mbuf, m_dat) == 32); 114CTASSERT(sizeof(struct pkthdr) == 56); 115CTASSERT(sizeof(struct struct_m_ext) == 48); 116#else 117CTASSERT(offsetof(struct mbuf, m_dat) == 24); 118CTASSERT(sizeof(struct pkthdr) == 48); 119CTASSERT(sizeof(struct struct_m_ext) == 28); 120#endif 121 122/* |
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| 96 * m_get2() allocates minimum mbuf that would fit "size" argument. 97 */ 98struct mbuf * 99m_get2(int size, int how, short type, int flags) 100{ 101 struct mb_args args; 102 struct mbuf *m, *n; 103 --- 1908 unchanged lines hidden --- | 123 * m_get2() allocates minimum mbuf that would fit "size" argument. 124 */ 125struct mbuf * 126m_get2(int size, int how, short type, int flags) 127{ 128 struct mb_args args; 129 struct mbuf *m, *n; 130 --- 1908 unchanged lines hidden --- |