bsd/netat/atp_misc.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  *      Copyright (c) 1996-1998 Apple Computer, Inc.
  25  *      All Rights Reserved.
  26  */
  27
  28 /*    Modified for MP, 1996 by Tuyen Nguyen
  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/ioctl.h>
  42 #include <sys/malloc.h>
  43 #include <sys/socket.h>
  44
  45 #include <netat/sysglue.h>
  46 #include <netat/appletalk.h>
  47 #include <netat/ddp.h>
  48 #include <netat/at_pcb.h>
  49 #include <netat/atp.h>
  50 #include <netat/debug.h>
  51
  52 extern atlock_t atpgen_lock;
  53 void atp_free();
  54 void atp_send(struct atp_trans *);
  55
  56 /*
  57  *      The request timer retries a request, if all retries are used up
  58  *              it returns a NAK
  59  */
  60
  61 void
  62 atp_req_timeout(trp)
  63 register struct atp_trans *trp;
  64 {
  65         int s;
  66         register gbuf_t *m;
  67         gref_t *gref;
  68         struct atp_state *atp;
  69         struct atp_trans *ctrp;
  70
  71         if ((atp = trp->tr_queue) == 0)
  72                 return;
  73         ATDISABLE(s, atp->atp_lock);
  74         if (atp->atp_flags & ATP_CLOSING) {
  75                 ATENABLE(s, atp->atp_lock);
  76                 return;
  77         }
  78         for (ctrp = atp->atp_trans_wait.head; ctrp; ctrp = ctrp->tr_list.next) {
  79                 if (ctrp == trp)
  80                         break;
  81         }
  82         if (ctrp != trp) {
  83                 ATENABLE(s, atp->atp_lock);
  84                 return;
  85         }
  86
  87         if ((m = gbuf_cont(trp->tr_xmt)) == NULL)
  88                 m = trp->tr_xmt;               /* issued via the new interface */
  89
  90         if (trp->tr_retry == 0) {
  91                 trp->tr_state = TRANS_FAILED;
  92                 if (m == trp->tr_xmt) {
  93                         trp->tr_xmt = NULL;
  94 l_notify:
  95                                 gbuf_wset(m,1);
  96                                 *gbuf_rptr(m) = 99;
  97                                 gbuf_set_type(m, MSG_DATA);
  98                                 gref = trp->tr_queue->atp_gref;
  99                                 ATENABLE(s, atp->atp_lock);
 100                                 atalk_putnext(gref, m);
 101
 102                         return;
 103                 }
 104                 dPrintf(D_M_ATP_LOW,D_L_INFO, ("atp_req_timeout: skt=%d\n",
 105                         trp->tr_local_socket));
 106                 m = trp->tr_xmt;
 107                 switch(((ioc_t *)(gbuf_rptr(trp->tr_xmt)))->ioc_cmd) {
 108                 case AT_ATP_ISSUE_REQUEST:
 109                         trp->tr_xmt = NULL;
 110                         if (trp->tr_queue->dflag)
 111                                 ((ioc_t *)gbuf_rptr(m))->ioc_cmd = AT_ATP_REQUEST_COMPLETE;
 112                         else if (trp->tr_bdsp == NULL) {
 113                                 ATENABLE(s, atp->atp_lock);
 114                                 gbuf_freem(m);
 115                                 if (trp->tr_rsp_wait)
 116                                         wakeup(&trp->tr_event);
 117                                 break;
 118                         }
 119                         ATENABLE(s, atp->atp_lock);
 120                         atp_iocnak(trp->tr_queue, m, ETIMEDOUT);
 121                         atp_free(trp);
 122                         return;
 123
 124                 case AT_ATP_ISSUE_REQUEST_NOTE:
 125                 case AT_ATP_ISSUE_REQUEST_TICKLE:
 126                         trp->tr_xmt = gbuf_cont(m);
 127                         gbuf_cont(m) = NULL;
 128                         goto l_notify;
 129                 }
 130         } else {
 131                 (AT_ATP_HDR(m))->bitmap = trp->tr_bitmap;
 132
 133                 if (trp->tr_retry != (unsigned int) ATP_INFINITE_RETRIES)
 134                         trp->tr_retry--;
 135                 ATENABLE(s, atp->atp_lock);
 136                 atp_send(trp);
 137         }
 138 }
 139
 140
 141 /*
 142  *      atp_free frees up a request, cleaning up the queues and freeing
 143  *              the request packet
 144  *      always called at 'lock'
 145  */
 146
 147 void atp_free(trp)
 148 register struct atp_trans *trp;
 149 {
 150         register struct atp_state *atp;
 151         register int i;
 152         int s;
 153
 154         dPrintf(D_M_ATP_LOW, D_L_TRACE,
 155                 ("atp_free: freeing trp 0x%x\n", (u_int) trp));
 156
 157         ATDISABLE(s, atpgen_lock);
 158
 159         if (trp->tr_state == TRANS_ABORTING) {
 160                 ATP_Q_REMOVE(atp_trans_abort, trp, tr_list);
 161                 trp->tr_state = TRANS_DONE;
 162         }
 163         else {
 164                 if (trp->tr_tmo_func)
 165                 atp_untimout(atp_req_timeout, trp);
 166
 167                 atp = trp->tr_queue;
 168                 ATP_Q_REMOVE(atp->atp_trans_wait, trp, tr_list);
 169
 170                 if (trp->tr_xmt) {
 171                         gbuf_freem(trp->tr_xmt);
 172                         trp->tr_xmt = NULL;
 173                 }
 174                 for (i = 0; i < 8; i++) {
 175                         if (trp->tr_rcv[i]) {
 176                                 gbuf_freem(trp->tr_rcv[i]);
 177                                 trp->tr_rcv[i] = NULL;
 178                         }
 179                 }
 180                 if (trp->tr_bdsp) {
 181                         gbuf_freem(trp->tr_bdsp);
 182                         trp->tr_bdsp = NULL;
 183                 }
 184
 185                 if (trp->tr_rsp_wait) {
 186                         trp->tr_state = TRANS_ABORTING;
 187                         ATP_Q_APPEND(atp_trans_abort, trp, tr_list);
 188                         wakeup(&trp->tr_event);
 189                         ATENABLE(s, atpgen_lock);
 190                         return;
 191                 }
 192         }
 193
 194         ATENABLE(s, atpgen_lock);
 195         atp_trans_free(trp);
 196 } /* atp_free */
 197
 198
 199 /*
 200  *      atp_send transmits a request packet by queuing it (if it isn't already) and
 201  *              scheduling the queue
 202  */
 203
 204 void atp_send(trp)
 205 register struct atp_trans *trp;
 206 {
 207         gbuf_t *m;
 208         struct atp_state *atp;
 209
 210         dPrintf(D_M_ATP_LOW, D_L_OUTPUT, ("atp_send: trp=0x%x, loc=%d\n",
 211                 (u_int) trp->tr_queue, trp->tr_local_socket));
 212
 213         if ((atp = trp->tr_queue) != 0) {
 214           if (trp->tr_state == TRANS_TIMEOUT) {
 215             if ((m = gbuf_cont(trp->tr_xmt)) == NULL)
 216                 m = trp->tr_xmt;
 217
 218             /*
 219              *  Now either release the transaction or start the timer
 220              */
 221             if (!trp->tr_retry && !trp->tr_bitmap && !trp->tr_xo) {
 222                 m = (gbuf_t *)gbuf_copym(m);
 223                 atp_x_done(trp);
 224             } else {
 225                 m = (gbuf_t *)gbuf_dupm(m);
 226
 227                 atp_timout(atp_req_timeout, trp, trp->tr_timeout);
 228             }
 229
 230             if (m) {
 231                 trace_mbufs(D_M_ATP_LOW, "  m", m);
 232                 DDP_OUTPUT(m);
 233             }
 234         }
 235   }
 236 }
 237
 238
 239 /*
 240  *      atp_reply sends all the available messages in the bitmap again
 241  *              by queueing us to the write service routine
 242  */
 243
 244 void atp_reply(rcbp)
 245 register struct atp_rcb *rcbp;
 246 {
 247         register struct atp_state *atp;
 248         register int i;
 249         int s;
 250
 251   if ((atp = rcbp->rc_queue) != 0) {
 252         ATDISABLE(s, atp->atp_lock);
 253         for (i = 0; i < rcbp->rc_pktcnt; i++) {
 254                 if (rcbp->rc_bitmap&atp_mask[i])
 255                         rcbp->rc_snd[i] = 1;
 256                 else
 257                         rcbp->rc_snd[i] = 0;
 258         }
 259         if (rcbp->rc_rep_waiting == 0) {
 260                 rcbp->rc_state = RCB_SENDING;
 261                 rcbp->rc_rep_waiting = 1;
 262                 ATENABLE(s, atp->atp_lock);
 263                 atp_send_replies(atp, rcbp);
 264         } else
 265         ATENABLE(s, atp->atp_lock);
 266   }
 267 }
 268
 269
 270 /*
 271  *      The rcb timer just frees the rcb, this happens when we missed a release for XO
 272  */
 273
 274 void atp_rcb_timer()
 275 {
 276         int s;
 277         register struct atp_rcb *rcbp;
 278         register struct atp_rcb *next_rcbp;
 279         extern   struct atp_rcb_qhead atp_need_rel;
 280         extern struct atp_trans *trp_tmo_rcb;
 281         struct timeval timenow;
 282
 283 l_again:
 284         ATDISABLE(s, atpgen_lock);
 285         getmicrouptime(&timenow);
 286         for (rcbp = atp_need_rel.head; rcbp; rcbp = next_rcbp) {
 287                 next_rcbp = rcbp->rc_tlist.next;
 288
 289                 if (abs(timenow.tv_sec - rcbp->rc_timestamp) > 30) {
 290                         ATENABLE(s, atpgen_lock);
 291                         atp_rcb_free(rcbp);
 292                         goto l_again;
 293                 }
 294         }
 295         ATENABLE(s, atpgen_lock);
 296         atp_timout(atp_rcb_timer, trp_tmo_rcb, 10 * HZ);
 297 }
 298
 299 atp_iocack(atp, m)
 300 struct   atp_state *atp;
 301 register gbuf_t *m;
 302 {
 303         if (gbuf_type(m) == MSG_IOCTL)
 304                 gbuf_set_type(m, MSG_IOCACK);
 305         if (gbuf_cont(m))
 306                 ((ioc_t *)gbuf_rptr(m))->ioc_count = gbuf_msgsize(gbuf_cont(m));
 307         else
 308                 ((ioc_t *)gbuf_rptr(m))->ioc_count = 0;
 309
 310         if (atp->dflag)
 311                 asp_ack_reply(atp->atp_gref, m);
 312         else
 313                 atalk_putnext(atp->atp_gref, m);
 314 }
 315
 316 atp_iocnak(atp, m, err)
 317 struct   atp_state *atp;
 318 register gbuf_t *m;
 319 register int err;
 320 {
 321         if (gbuf_type(m) == MSG_IOCTL)
 322                 gbuf_set_type(m, MSG_IOCNAK);
 323         ((ioc_t *)gbuf_rptr(m))->ioc_count = 0;
 324         ((ioc_t *)gbuf_rptr(m))->ioc_error = err ? err : ENXIO;
 325         ((ioc_t *)gbuf_rptr(m))->ioc_rval = -1;
 326         if (gbuf_cont(m)) {
 327                 gbuf_freem(gbuf_cont(m));
 328                 gbuf_cont(m) = NULL;
 329         }
 330
 331         if (atp->dflag)
 332                 asp_nak_reply(atp->atp_gref, m);
 333         else
 334                 atalk_putnext(atp->atp_gref, m);
 335 }
 336
 337 /*
 338  *      Generate a transaction id for a socket
 339  */
 340 static int lasttid;
 341 atp_tid(atp)
 342 register struct atp_state *atp;
 343 {
 344         register int i;
 345         register struct atp_trans *trp;
 346         int s;
 347
 348         ATDISABLE(s, atpgen_lock);
 349         for (i = lasttid;;) {
 350                 i = (i+1)&0xffff;
 351
 352                 for (trp = atp->atp_trans_wait.head; trp; trp = trp->tr_list.next) {
 353                         if (trp->tr_tid == i)
 354                                 break;
 355                 }
 356                 if (trp == NULL) {
 357                         lasttid = i;
 358                         ATENABLE(s, atpgen_lock);
 359                         return(i);
 360                 }
 361         }
 362 }