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- /*
- * Mach Operating System
- * Copyright (c) 1987 Carnegie-Mellon University
- * All rights reserved. The CMU software License Agreement specifies
- * the terms and conditions for use and redistribution.
- */
- /*
- * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
- * All rights reserved.
- *
- * Copyright (c) 1994 NeXT Computer, Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that this notice is preserved and that due credit is given
- * to the University of California at Berkeley. The name of the University
- * may not be used to endorse or promote products derived from this
- * software without specific prior written permission. This software
- * is provided ``as is'' without express or implied warranty.
- **********************************************************************
- * HISTORY
- * 20-May-94 AOF (NeXT) Stanford MULTICAST
- *
- * 27-Sep-89 Morris Meyer (mmeyer) at NeXT
- * NFS 4.0 Changes.
- *
- * 11-Aug-87 Peter King (king) at NeXT
- * SUN_RPC: Added support for "funny" mbuf clusters. MFREE calls
- * mclput() rather than MCLFREE.
- *
- * 18-Nov-86 David Golub (dbg) at Carnegie-Mellon University
- * Remove all uses of 'pte' from machine-independent code.
- *
- * @(#)mbuf.h 7.8.1.2 (Berkeley) 2/8/88
- */
-
- /*
- * Constants related to memory allocator.
- */
- #define MSIZE 128 /* size of an mbuf */
-
- /* CLBYTES is not a constant for the NeXT */
- #if CLBYTES > 1024 || defined(NeXT)
- #define MCLBYTES 1024
- #define MCLSHIFT 10
- #define MCLOFSET (MCLBYTES - 1)
- #else
- #define MCLBYTES CLBYTES
- #define MCLSHIFT CLSHIFT
- #define MCLOFSET CLOFSET
- #endif
-
- #define MMINOFF 12 /* mbuf header length */
- #define MTAIL 4
- #define MMAXOFF (MSIZE-MTAIL) /* offset where data ends */
- #define MLEN (MSIZE-MMINOFF-MTAIL) /* mbuf data length */
- #if defined(GATEWAY) || defined(NeXT)
- #define NMBCLUSTERS 512
- #else
- #define NMBCLUSTERS 256
- #endif
- #define NMBPCL (CLBYTES/MSIZE) /* # mbufs per cluster */
-
- /*
- * Macros for type conversion
- */
-
- /* network cluster number to virtual address, and back */
- #define cltom(x) ((struct mbuf *)((int)mbutl + ((x) << MCLSHIFT)))
- #define mtocl(x) (((int)x - (int)mbutl) >> MCLSHIFT)
-
- /* address in mbuf to mbuf head */
- #define dtom(x) ((struct mbuf *)((int)x & ~(MSIZE-1)))
-
- /* mbuf head, to typed data */
- #define mtod(x,t) ((t)((int)(x) + (x)->m_off))
-
- /*
- * Standard 4.3 supports two kinds of mbufs: normal mbufs, with data
- * residing in the mbuf itself; and cluster mbufs with data stored
- * elsewhere (at a higher address than the corresponding mbuf).
- * The data area for cluster mbufs is allocated as a pool and is
- * managed by the mbuf system itself. We add another kind of cluster
- * mbuf, whose data area is not part of the mbuf system. Instead,
- * a routine wishing to use this kind of mbuf must provide a buffer
- * for the storage associated with the mbuf and a pointer to a routine
- * to free the buffer when the mbuf is freed. The fields in mun_cl
- * below record the necessary bookkeeping information.
- */
- struct mbuf {
- struct mbuf *m_next; /* next buffer in chain */
- u_long m_off; /* offset of data */
- short m_len; /* amount of data in this mbuf */
- short m_type; /* mbuf type (0 == free) */
- union {
- u_char mun_dat[MLEN]; /* data storage */
- struct {
- short mun_cltype; /* "cluster" type */
- int (*mun_clfun)();
- int mun_clarg;
- int (*mun_clswp)();
- } mun_cl;
- } m_un;
- struct mbuf *m_act; /* link in higher-level mbuf list */
- };
- #define m_dat m_un.mun_dat
- #define m_cltype m_un.mun_cl.mun_cltype
- #define m_clfun m_un.mun_cl.mun_clfun
- #define m_clarg m_un.mun_cl.mun_clarg
- #define m_clswp m_un.mun_cl.mun_clswp
-
- /* mbuf types */
- #define MT_FREE 0 /* should be on free list */
- #define MT_DATA 1 /* dynamic (data) allocation */
- #define MT_HEADER 2 /* packet header */
- #define MT_SOCKET 3 /* socket structure */
- #define MT_PCB 4 /* protocol control block */
- #define MT_RTABLE 5 /* routing tables */
- #define MT_HTABLE 6 /* IMP host tables */
- #define MT_ATABLE 7 /* address resolution tables */
- #define MT_SONAME 8 /* socket name */
- #define MT_ZOMBIE 9 /* zombie proc status */
- #define MT_SOOPTS 10 /* socket options */
- #define MT_FTABLE 11 /* fragment reassembly header */
- #define MT_RIGHTS 12 /* access rights */
- #define MT_IFADDR 13 /* interface address */
- #define MT_IPMOPTS 14 /* internet multicast options */
- #define MT_IPMADDR 15 /* internet multicast address */
- #define MT_IFMADDR 16 /* link-level multicast address */
- #define MT_MRTABLE 17 /* multicast routing tables */
- #if NeXT
- #define MT_MAX 32
- #endif NeXT
-
- /*
- * Values for m_cltype: applicable only for cluster mbufs
- */
- #define MCL_STATIC 1 /* data in mbuf cluster pool */
- #define MCL_LOANED 2 /* data allocated elsewhere and "loaned"
- to the mbuf */
-
- /* flags to m_get */
- #define M_DONTWAIT 0
- #define M_WAIT 1
-
- /* flags to m_pgalloc */
- #define MPG_MBUFS 0 /* put new mbufs on free list */
- #define MPG_CLUSTERS 1 /* put new clusters on free list */
- #define MPG_SPACE 2 /* don't free; caller wants space */
-
- /* length to m_copy to copy all */
- #define M_COPYALL 1000000000
-
- /*
- * m_pullup will pull up additional length if convenient;
- * should be enough to hold headers of second-level and higher protocols.
- */
- #define MPULL_EXTRA 32
-
- /*
- * Macros for mbuf manipulation.
- *
- * Standard 4.3 defines some additional macros not given here
- * (MTOCL, MCLFREE), as they are useful only within uipc_mbuf.c
- * or can't cope with the existence of the MCL_LOANED cluster
- * mbuf type.
- *
- * MCLALLOC allocates MCL_STATIC clusters. Note that it works
- * only with a count of 1 at the moment. MCLGET connects such clusters
- * to a normal mbuf. m->m_len is set to CLBYTES upon success.
- */
- #define MGET(m, i, t) \
- { int ms = splimp(); \
- if ((m)=mfree) \
- { if ((m)->m_type != MT_FREE) panic("mget"); (m)->m_type = t; \
- mbstat.m_mtypes[MT_FREE]--; mbstat.m_mtypes[t]++; \
- mfree = (m)->m_next; (m)->m_next = 0; \
- (m)->m_off = MMINOFF; } \
- else \
- (m) = m_more(i, t); \
- splx(ms); }
- /*
- * Mbuf page cluster macros.
- * MCLALLOC allocates mbuf page clusters.
- * Note that it works only with a count of 1 at the moment.
- * MCLGET adds such clusters to a normal mbuf.
- * m->m_len is set to MCLBYTES upon success, and to MLEN on failure.
- * MCLFREE frees clusters allocated by MCLALLOC.
- */
- #define MCLALLOC(m, i) \
- { int ms = splimp(); \
- if (mclfree == 0) \
- (void)m_clalloc((i), MPG_CLUSTERS, M_DONTWAIT); \
- if ((m)=mclfree) \
- {++mclrefcnt[mtocl(m)];mbstat.m_clfree--;mclfree = (m)->m_next;} \
- splx(ms); }
- #define M_HASCL(m) ((m)->m_off >= MSIZE)
- #define MTOCL(m) ((struct mbuf *)(mtod((m), int) &~ MCLOFSET))
-
- #define MCLGET(m) \
- { struct mbuf *p; \
- MCLALLOC(p, 1); \
- if (p) { \
- (m)->m_off = (int)p - (int)(m); \
- (m)->m_len = MCLBYTES; \
- (m)->m_cltype = MCL_STATIC; \
- } else \
- (m)->m_len = MLEN; \
- }
- #define MCLFREE(m) { \
- if (--mclrefcnt[mtocl(m)] == 0) \
- { (m)->m_next = mclfree;mclfree = (m);mbstat.m_clfree++;} \
- }
- #define MFREE(m, n) \
- { int ms = splimp(); \
- if ((m)->m_type == MT_FREE) panic("mfree"); \
- mbstat.m_mtypes[(m)->m_type]--; mbstat.m_mtypes[MT_FREE]++; \
- (m)->m_type = MT_FREE; \
- if (M_HASCL(m)) { \
- mclput(m); \
- } \
- (n) = (m)->m_next; (m)->m_next = mfree; \
- (m)->m_off = 0; (m)->m_act = 0; mfree = (m); \
- splx(ms); \
- if (m_want) { \
- m_want = 0; \
- wakeup((caddr_t)&mfree); \
- } \
- }
-
- /*
- * Mbuf statistics.
- */
- struct mbstat {
- u_long m_mbufs; /* mbufs obtained from page pool */
- u_long m_clusters; /* clusters obtained from page pool */
- u_long m_space; /* interface pages obtained from page pool */
- u_long m_clfree; /* free clusters */
- u_long m_drops; /* times failed to find space */
- u_long m_wait; /* times waited for space */
- u_long m_drain; /* times drained protocols for space */
- #if NeXT
- u_short m_mtypes[MT_MAX]; /* type specific mbuf allocations */
- #else NeXT
- u_short m_mtypes[256]; /* type specific mbuf allocations */
- #endif NeXT
- };
-
- #ifdef KERNEL
- struct mbuf *mbutl, embutl; /* virtual address of net free mem */
- struct mbstat mbstat;
- int nmbclusters;
- struct mbuf *mfree, *mclfree;
- char mclrefcnt[NMBCLUSTERS + 1];
- int m_want;
- struct mbuf *m_get(),*m_getclr(),*m_free(),*m_more(),*m_copy(),*m_pullup();
- struct mbuf *mclgetx();
- caddr_t m_clalloc();
- #endif
-