![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to mbuf.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Power 6/32 Unix Tahoe 4.2BSD] / cci / sys / h|
Return to mbuf.h CVS log | Up to [Power 6/32 Unix Tahoe 4.2BSD] / cci / sys / h |
1.1 root 1: /* mbuf.h 6.1 83/07/29 */
2:
3: /*
4: * Constants related to memory allocator.
5: */
6: #define MSIZE 128 /* size of an mbuf */
7: #define MMINOFF 12 /* mbuf header length */
8: #define MTAIL 4
9: #define MMAXOFF (MSIZE-MTAIL) /* offset where data ends */
10: #define MLEN (MSIZE-MMINOFF-MTAIL) /* mbuf data length */
11: #define NMBCLUSTERS 256
12: #define NMBPCL (CLBYTES/MSIZE) /* # mbufs per cluster */
13:
14: /*
15: * Macros for type conversion
16: */
17:
18: /* network cluster number to virtual address, and back */
19: #define cltom(x) ((struct mbuf *)((int)mbutl + ((x) << CLSHIFT)))
20: #define mtocl(x) (((int)x - (int)mbutl) >> CLSHIFT)
21:
22: /* address in mbuf to mbuf head */
23: #define dtom(x) ((struct mbuf *)((int)x & ~(MSIZE-1)))
24:
25: /* mbuf head, to typed data */
26: #define mtod(x,t) ((t)((int)(x) + (x)->m_off))
27:
28: struct mbuf {
29: struct mbuf *m_next; /* next buffer in chain */
30: u_long m_off; /* offset of data */
31: short m_len; /* amount of data in this mbuf */
32: short m_type; /* mbuf type (0 == free) */
33: u_char m_dat[MLEN]; /* data storage */
34: struct mbuf *m_act; /* link in higher-level mbuf list */
35: };
36:
37: /* mbuf types */
38: #define MT_FREE 0 /* should be on free list */
39: #define MT_DATA 1 /* dynamic (data) allocation */
40: #define MT_HEADER 2 /* packet header */
41: #define MT_SOCKET 3 /* socket structure */
42: #define MT_PCB 4 /* protocol control block */
43: #define MT_RTABLE 5 /* routing tables */
44: #define MT_HTABLE 6 /* IMP host tables */
45: #define MT_ATABLE 7 /* address resolution tables */
46: #define MT_SONAME 8 /* socket name */
47: #define MT_ZOMBIE 9 /* zombie proc status */
48: #define MT_SOOPTS 10 /* socket options */
49: #define MT_FTABLE 11 /* fragment reassembly header */
50:
51: /* flags to m_get */
52: #define M_DONTWAIT 0
53: #define M_WAIT 1
54:
55: /* flags to m_pgalloc */
56: #define MPG_MBUFS 0 /* put new mbufs on free list */
57: #define MPG_CLUSTERS 1 /* put new clusters on free list */
58: #define MPG_SPACE 2 /* don't free; caller wants space */
59:
60: /* length to m_copy to copy all */
61: #define M_COPYALL 1000000000
62:
63: /*
64: * Changes: print more info before panicking
65: */
66: #define MGET(m, i, t) \
67: { int ms = splimp(); \
68: if ((m)=mfree) \
69: { if ((m)->m_type != MT_FREE) { \
70: printf("mget: type %d, next %lx, act %lx\n", \
71: (m)->m_type, (m)->m_next, (m)->m_act); \
72: panic("mget"); \
73: } \
74: (m)->m_type = t; \
75: mbstat.m_mbfree--; mbstat.m_mtypes[t]++; \
76: mfree = (m)->m_next; (m)->m_next = 0; \
77: (m)->m_off = MMINOFF; } \
78: else \
79: (m) = m_more(i, t); \
80: splx(ms); }
81: #define MCLGET(m, i) \
82: { int ms = splimp(); \
83: if ((m)=mclfree) \
84: {++mclrefcnt[mtocl(m)];mbstat.m_clfree--;mclfree = (m)->m_next;} \
85: splx(ms); }
86: #define MFREE(m, n) \
87: { int ms = splimp(); \
88: if ((m)->m_type == MT_FREE) panic("mfree"); \
89: if ((m)->m_type < MT_DATA || (m)->m_type > MT_FTABLE) \
90: panic("mfree (badtype)"); \
91: mbstat.m_mtypes[(m)->m_type]--; (m)->m_type = MT_FREE; \
92: if ((m)->m_off > MSIZE) { \
93: (n) = (struct mbuf *)(mtod(m, int)&~CLOFSET); \
94: if (--mclrefcnt[mtocl(n)] == 0) \
95: { (n)->m_next = mclfree;mclfree = (n);mbstat.m_clfree++;} \
96: } \
97: (n) = (m)->m_next; (m)->m_next = mfree; \
98: (m)->m_off = 0; (m)->m_act = 0; mfree = (m); mbstat.m_mbfree++; \
99: splx(ms); }
100:
101: /*
102: * Mbuf statistics.
103: */
104: struct mbstat {
105: short m_mbufs; /* mbufs obtained from page pool */
106: short m_mbfree; /* mbufs on our free list */
107: short m_clusters; /* clusters obtained from page pool */
108: short m_clfree; /* free clusters */
109: short m_drops; /* times failed to find space */
110: short m_mtypes[256]; /* type specific mbuf allocations */
111: };
112:
113: #ifdef KERNEL
114: extern struct mbuf mbutl[]; /* virtual address of net free mem */
115: extern struct pte Mbmap[]; /* page tables to map Netutl */
116: struct mbstat mbstat;
117: int nmbclusters;
118: struct mbuf *mfree, *mclfree;
119: char mclrefcnt[NMBCLUSTERS];
120: struct mbuf *m_get(),*m_getclr(),*m_free(),*m_more(),*m_copy(),*m_pullup();
121: caddr_t m_clalloc();
122: #ifdef NETGENERR
123: #define MBUFNULL(LEVEL,M) { \
124: if (mbufnull((LEVEL))) { \
125: m_free(M); \
126: (M) = (struct mbuf *)0; \
127: } \
128: }
129: #else
130: #define MBUFNULL(LEVEL,M)
131: #endif NETGENERR
132: #endif
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.