bsd/netat/atp_alloc.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*    Modified for MP, 1996 by Tuyen Nguyen */
  29 /*
  30  *      tcb (transaction) allocation routine. If no transaction data structure
  31  *              is available then put the module on a queue of modules waiting
  32  *              for transaction structures. When a tcb is available it will be
  33  *              removed from this list and its write queue will be scheduled.
  34  *      Version 1.4 of atp_alloc.c on 89/02/09 17:53:01
  35  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  36  */
  37 #include <sys/errno.h>
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <machine/spl.h>
  41 #include <sys/systm.h>
  42 #include <sys/kernel.h>
  43 #include <sys/proc.h>
  44 #include <sys/filedesc.h>
  45 #include <sys/fcntl.h>
  46 #include <sys/mbuf.h>
  47 #include <sys/socket.h>
  48
  49 #include <netat/sysglue.h>
  50 #include <netat/appletalk.h>
  51 #include <netat/ddp.h>
  52 #include <netat/debug.h>
  53 #include <netat/at_pcb.h>
  54 #include <netat/atp.h>
  55
  56 /*### MacOSX MCLBYTE is 2048, not 4096 like AIX */
  57 #define TRPS_PER_BLK 16
  58
  59 gbuf_t *atp_resource_m = 0;
  60 extern caddr_t atp_free_cluster_list;
  61 extern void atp_delete_free_clusters();
  62
  63 struct atp_trans *atp_trans_alloc(atp)
  64 struct  atp_state *atp;
  65 {
  66         int i;
  67         gbuf_t *m;
  68         register struct atp_trans *trp, *trp_array;
  69
  70         if (atp_trans_free_list == 0) {
  71                 if ((m = gbuf_alloc(TRPS_PER_BLK*sizeof(struct atp_trans),PRI_HI)) == 0)
  72                         return (struct atp_trans *)0;
  73                 bzero(gbuf_rptr(m), TRPS_PER_BLK*sizeof(struct atp_trans));
  74                 trp_array = (struct atp_trans *)gbuf_rptr(m);
  75                 for (i=0; i < TRPS_PER_BLK-1; i++)
  76                         trp_array[i].tr_list.next = (struct atp_trans *)&trp_array[i+1];
  77                 gbuf_cont(m) = atp_resource_m;
  78                 atp_resource_m = m;
  79                 trp_array[i].tr_list.next = atp_trans_free_list;
  80                 atp_trans_free_list = (struct atp_trans *)&trp_array[0];
  81         }
  82
  83         trp = atp_trans_free_list;
  84         atp_trans_free_list = trp->tr_list.next;
  85         trp->tr_queue = atp;
  86         trp->tr_state = TRANS_TIMEOUT;
  87         trp->tr_local_node = 0;
  88         ATEVENTINIT(trp->tr_event);
  89
  90         dPrintf(D_M_ATP_LOW, D_L_TRACE,
  91                 ("atp_trans_alloc(0x%x): alloc'd trp 0x%x\n",
  92                  (u_int) atp, (u_int) trp));
  93         return trp;
  94 } /* atp_trans_alloc */
  95
  96 /*
  97  *      tcb free routine - if modules are waiting schedule them
  98  *      always called at 'lock'
  99  */
 100
 101 void atp_trans_free(trp)
 102 register struct atp_trans *trp;
 103 {
 104
 105         trp->tr_queue = 0;
 106         trp->tr_list.next = atp_trans_free_list;
 107         atp_trans_free_list = trp;
 108 }
 109
 110 /*
 111  *      This routine allocates a rcb, if none are available it makes sure the
 112  *              the write service routine will be called when one is
 113  *      always called at 'lock'
 114  */
 115
 116 struct atp_rcb *atp_rcb_alloc(atp)
 117 struct  atp_state *atp;
 118 {
 119         register struct atp_rcb *rcbp;
 120
 121         if ((rcbp = atp_rcb_free_list) != NULL) {
 122                 atp_rcb_free_list = rcbp->rc_list.next;
 123                 rcbp->rc_queue = atp;
 124                 rcbp->rc_pktcnt = 0;
 125                 rcbp->rc_local_node = 0;
 126         }
 127         dPrintf(D_M_ATP_LOW, D_L_TRACE,
 128                 ("atp_rcb_alloc: allocated rcbp 0x%x\n", (u_int) rcbp));
 129         return(rcbp);
 130 }
 131
 132 /*
 133  *      Here we free rcbs, if required reschedule other people waiting for them
 134  *      always called at 'lock'
 135  */
 136
 137 void atp_rcb_free(rcbp)
 138 register struct atp_rcb *rcbp;
 139 {
 140         register struct atp_state *atp;
 141         register int i;
 142         register int rc_state;
 143
 144         dPrintf(D_M_ATP_LOW, D_L_TRACE,
 145                 ("atp_rcb_free: freeing rcbp 0x%x\n", (u_int) rcbp));
 146         atp = rcbp->rc_queue;
 147         if ((rc_state = rcbp->rc_state) == -1) {
 148                 dPrintf(D_M_ATP, D_L_WARNING,
 149                         ("atp_rcb_free(%d): tid=%d,loc=%d,rem=%d\n",
 150                         0, rcbp->rc_tid,
 151                         rcbp->rc_socket.socket, atp->atp_socket_no));
 152                 return;
 153         }
 154         rcbp->rc_state = -1;
 155         rcbp->rc_xo = 0;
 156         rcbp->rc_queue = 0;
 157
 158         if (rcbp->rc_timestamp) {
 159                 extern struct atp_rcb_qhead atp_need_rel;
 160
 161                 rcbp->rc_timestamp = 0;
 162                 ATP_Q_REMOVE(atp_need_rel, rcbp, rc_tlist);
 163                 rcbp->rc_tlist.prev = NULL;
 164                 rcbp->rc_tlist.next = NULL;
 165         }
 166
 167         if (rcbp->rc_xmt) {
 168                 gbuf_freem(rcbp->rc_xmt); /* *** bad free is the second mbuf in this chain *** */
 169                 rcbp->rc_xmt = NULL;
 170                 for (i=0; i < rcbp->rc_pktcnt; i++)
 171                         rcbp->rc_snd[i] = 0;
 172         }
 173         if (atp_free_cluster_list)
 174                 atp_delete_free_clusters();
 175         if (rc_state != RCB_UNQUEUED) {
 176                 if (rc_state == RCB_PENDING) {
 177                         ATP_Q_REMOVE(atp->atp_attached, rcbp, rc_list);
 178                 } else {
 179                         ATP_Q_REMOVE(atp->atp_rcb, rcbp, rc_list);
 180                 }
 181         }
 182         if (rcbp->rc_ioctl) {
 183                 gbuf_freem(rcbp->rc_ioctl);
 184                 rcbp->rc_ioctl = NULL;
 185         }
 186         rcbp->rc_list.next = atp_rcb_free_list;
 187         atp_rcb_free_list = rcbp;
 188 }