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Annotation of 42BSD/sys/h/mbuf.h, revision 1.1

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: #define        MGET(m, i, t) \
        !            64:        { int ms = splimp(); \
        !            65:          if ((m)=mfree) \
        !            66:                { if ((m)->m_type != MT_FREE) panic("mget"); (m)->m_type = t; \
        !            67:                  mbstat.m_mbfree--; mbstat.m_mtypes[t]++; \
        !            68:                  mfree = (m)->m_next; (m)->m_next = 0; \
        !            69:                  (m)->m_off = MMINOFF; } \
        !            70:          else \
        !            71:                (m) = m_more(i, t); \
        !            72:          splx(ms); }
        !            73: #define        MCLGET(m, i) \
        !            74:        { int ms = splimp(); \
        !            75:          if ((m)=mclfree) \
        !            76:             {++mclrefcnt[mtocl(m)];mbstat.m_clfree--;mclfree = (m)->m_next;} \
        !            77:          splx(ms); }
        !            78: #define        MFREE(m, n) \
        !            79:        { int ms = splimp(); \
        !            80:          if ((m)->m_type == MT_FREE) panic("mfree"); \
        !            81:          mbstat.m_mtypes[(m)->m_type]--; (m)->m_type = MT_FREE; \
        !            82:          if ((m)->m_off > MSIZE) { \
        !            83:                (n) = (struct mbuf *)(mtod(m, int)&~CLOFSET); \
        !            84:                if (--mclrefcnt[mtocl(n)] == 0) \
        !            85:                    { (n)->m_next = mclfree;mclfree = (n);mbstat.m_clfree++;} \
        !            86:          } \
        !            87:          (n) = (m)->m_next; (m)->m_next = mfree; \
        !            88:          (m)->m_off = 0; (m)->m_act = 0; mfree = (m); mbstat.m_mbfree++; \
        !            89:          splx(ms); }
        !            90: 
        !            91: /*
        !            92:  * Mbuf statistics.
        !            93:  */
        !            94: struct mbstat {
        !            95:        short   m_mbufs;        /* mbufs obtained from page pool */
        !            96:        short   m_mbfree;       /* mbufs on our free list */
        !            97:        short   m_clusters;     /* clusters obtained from page pool */
        !            98:        short   m_clfree;       /* free clusters */
        !            99:        short   m_drops;        /* times failed to find space */
        !           100:        short   m_mtypes[256];  /* type specific mbuf allocations */
        !           101: };
        !           102: 
        !           103: #ifdef KERNEL
        !           104: extern struct mbuf mbutl[];            /* virtual address of net free mem */
        !           105: extern struct pte Mbmap[];             /* page tables to map Netutl */
        !           106: struct mbstat mbstat;
        !           107: int    nmbclusters;
        !           108: struct mbuf *mfree, *mclfree;
        !           109: char   mclrefcnt[NMBCLUSTERS];
        !           110: struct mbuf *m_get(),*m_getclr(),*m_free(),*m_more(),*m_copy(),*m_pullup();
        !           111: caddr_t        m_clalloc();
        !           112: #endif

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