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Annotation of XNU/bsd/netat/atp_alloc.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*    Modified for MP, 1996 by Tuyen Nguyen */
        !            23: /*
        !            24:  *     tcb (transaction) allocation routine. If no transaction data structure
        !            25:  *             is available then put the module on a queue of modules waiting
        !            26:  *             for transaction structures. When a tcb is available it will be
        !            27:  *             removed from this list and its write queue will be scheduled.
        !            28:  *     Version 1.4 of atp_alloc.c on 89/02/09 17:53:01
        !            29:  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
        !            30:  */
        !            31: #include <sys/errno.h>
        !            32: #include <sys/types.h>
        !            33: #include <sys/param.h>
        !            34: #include <machine/spl.h>
        !            35: #include <sys/systm.h>
        !            36: #include <sys/kernel.h>
        !            37: #include <sys/proc.h>
        !            38: #include <sys/filedesc.h>
        !            39: #include <sys/fcntl.h>
        !            40: #include <sys/mbuf.h>
        !            41: #include <sys/socket.h>
        !            42: 
        !            43: #include <netat/sysglue.h>
        !            44: #include <netat/appletalk.h>
        !            45: #include <netat/ddp.h>
        !            46: #include <netat/debug.h>
        !            47: #include <netat/at_pcb.h>
        !            48: #include <netat/atp.h>
        !            49: 
        !            50: /*### MacOSX MCLBYTE is 2048, not 4096 like AIX */
        !            51: #define TRPS_PER_BLK 16
        !            52: 
        !            53: gbuf_t *atp_resource_m = 0;
        !            54: extern atlock_t atpgen_lock;
        !            55: 
        !            56: struct atp_trans *atp_trans_alloc(atp)
        !            57: struct  atp_state *atp;
        !            58: {
        !            59:        int s;
        !            60:        int i;
        !            61:        gbuf_t *m;
        !            62:        register struct atp_trans *trp, *trp_array;
        !            63: 
        !            64:        ATDISABLE(s, atpgen_lock);
        !            65:        if (atp_trans_free_list == 0) {
        !            66:                ATENABLE(s, atpgen_lock);
        !            67:                if ((m = gbuf_alloc(TRPS_PER_BLK*sizeof(struct atp_trans),PRI_HI)) == 0)
        !            68:                        return (struct atp_trans *)0;
        !            69:                bzero(gbuf_rptr(m), TRPS_PER_BLK*sizeof(struct atp_trans));
        !            70:                trp_array = (struct atp_trans *)gbuf_rptr(m);
        !            71:                for (i=0; i < TRPS_PER_BLK-1; i++)
        !            72:                        trp_array[i].tr_list.next = (struct atp_trans *)&trp_array[i+1];
        !            73:                ATDISABLE(s, atpgen_lock);
        !            74:                gbuf_cont(m) = atp_resource_m;
        !            75:                atp_resource_m = m;
        !            76:                trp_array[i].tr_list.next = atp_trans_free_list;
        !            77:                atp_trans_free_list = (struct atp_trans *)&trp_array[0];
        !            78:        }
        !            79: 
        !            80:        trp = atp_trans_free_list;
        !            81:        atp_trans_free_list = trp->tr_list.next;
        !            82:        ATENABLE(s, atpgen_lock);
        !            83:        trp->tr_queue = atp;
        !            84:        trp->tr_state = TRANS_TIMEOUT;
        !            85:        trp->tr_local_node = 0;
        !            86:        ATLOCKINIT(trp->tr_lock);
        !            87:        ATEVENTINIT(trp->tr_event);
        !            88: 
        !            89:        dPrintf(D_M_ATP_LOW, D_L_TRACE,
        !            90:                ("atp_trans_alloc(0x%x): alloc'd trp 0x%x\n", 
        !            91:                 (u_int) atp, (u_int) trp));
        !            92:        return trp;
        !            93: } /* atp_trans_alloc */
        !            94: 
        !            95: /*
        !            96:  *     tcb free routine - if modules are waiting schedule them
        !            97:  *      always called at 'lock'
        !            98:  */
        !            99: 
        !           100: void atp_trans_free(trp)
        !           101: register struct atp_trans *trp;
        !           102: {
        !           103:        int s;
        !           104: 
        !           105:        ATDISABLE(s, atpgen_lock);
        !           106:        trp->tr_queue = 0;
        !           107:        trp->tr_list.next = atp_trans_free_list;
        !           108:        atp_trans_free_list = trp;
        !           109:        ATENABLE(s, atpgen_lock);
        !           110: }
        !           111: 
        !           112: /*
        !           113:  *     This routine allocates a rcb, if none are available it makes sure the
        !           114:  *             the write service routine will be called when one is
        !           115:  *      always called at 'lock'
        !           116:  */
        !           117: 
        !           118: struct atp_rcb *atp_rcb_alloc(atp)
        !           119: struct  atp_state *atp;
        !           120: {
        !           121:        register struct atp_rcb *rcbp;
        !           122:        int s;
        !           123: 
        !           124:        ATDISABLE(s, atpgen_lock);
        !           125:        if ((rcbp = atp_rcb_free_list) != NULL) {
        !           126:                atp_rcb_free_list = rcbp->rc_list.next;
        !           127:                rcbp->rc_queue = atp;
        !           128:                rcbp->rc_pktcnt = 0;
        !           129:                rcbp->rc_local_node = 0;
        !           130:        }
        !           131:        ATENABLE(s, atpgen_lock);
        !           132:        dPrintf(D_M_ATP_LOW, D_L_TRACE,
        !           133:                ("atp_rcb_alloc: allocated rcbp 0x%x\n", (u_int) rcbp));
        !           134:        return(rcbp);
        !           135: }
        !           136: 
        !           137: /*
        !           138:  *     Here we free rcbs, if required reschedule other people waiting for them
        !           139:  *      always called at 'lock'
        !           140:  */
        !           141: 
        !           142: void atp_rcb_free(rcbp)
        !           143: register struct atp_rcb *rcbp;
        !           144: {
        !           145:        register struct atp_state *atp;
        !           146:        register int i;
        !           147:        register int rc_state;
        !           148:        int s;
        !           149: 
        !           150:        dPrintf(D_M_ATP_LOW, D_L_TRACE,
        !           151:                ("atp_rcb_free: freeing rcbp 0x%x\n", (u_int) rcbp));
        !           152:        ATDISABLE(s, atpgen_lock);
        !           153:        atp = rcbp->rc_queue;
        !           154:        if ((rc_state = rcbp->rc_state) == -1) {
        !           155:                ATENABLE(s, atpgen_lock);
        !           156:                dPrintf(D_M_ATP, D_L_WARNING,
        !           157:                        ("atp_rcb_free(%d): tid=%d,loc=%d,rem=%d\n",
        !           158:                        0, rcbp->rc_tid,
        !           159:                        rcbp->rc_socket.socket, atp->atp_socket_no));
        !           160:                return;
        !           161:        }
        !           162:        rcbp->rc_state = -1;
        !           163:        rcbp->rc_xo = 0;
        !           164:        rcbp->rc_queue = 0;
        !           165: 
        !           166:        if (rcbp->rc_timestamp) {
        !           167:                extern struct atp_rcb_qhead atp_need_rel;
        !           168: 
        !           169:                rcbp->rc_timestamp = 0;
        !           170:                ATP_Q_REMOVE(atp_need_rel, rcbp, rc_tlist);
        !           171:                rcbp->rc_tlist.prev = NULL;
        !           172:                rcbp->rc_tlist.next = NULL;
        !           173:        }
        !           174: 
        !           175:        if (rcbp->rc_xmt) {
        !           176:                gbuf_freem(rcbp->rc_xmt); /* *** bad free is the second mbuf in this chain *** */
        !           177:                rcbp->rc_xmt = NULL;
        !           178:                for (i=0; i < rcbp->rc_pktcnt; i++)
        !           179:                        rcbp->rc_snd[i] = 0;
        !           180:        }
        !           181:        if (rc_state != RCB_UNQUEUED) {
        !           182:                if (rc_state == RCB_PENDING) {
        !           183:                        ATP_Q_REMOVE(atp->atp_attached, rcbp, rc_list);
        !           184:                } else {
        !           185:                        ATP_Q_REMOVE(atp->atp_rcb, rcbp, rc_list);
        !           186:                }
        !           187:        }
        !           188:         if (rcbp->rc_ioctl) {
        !           189:                        gbuf_freem(rcbp->rc_ioctl);
        !           190:                rcbp->rc_ioctl = NULL;
        !           191:        }
        !           192:        rcbp->rc_list.next = atp_rcb_free_list;
        !           193:        atp_rcb_free_list = rcbp;
        !           194:        ATENABLE(s, atpgen_lock);
        !           195: }

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