bsd/netat/atp_misc.c

   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 /*
  23  *      Copyright (c) 1996-1998 Apple Computer, Inc.
  24  *      All Rights Reserved.
  25  */
  26
  27 /*    Modified for MP, 1996 by Tuyen Nguyen
  28  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  29  */
  30 #include <sys/errno.h>
  31 #include <sys/types.h>
  32 #include <sys/param.h>
  33 #include <machine/spl.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/proc.h>
  37 #include <sys/filedesc.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/malloc.h>
  42 #include <sys/socket.h>
  43
  44 #include <netat/sysglue.h>
  45 #include <netat/appletalk.h>
  46 #include <netat/ddp.h>
  47 #include <netat/at_pcb.h>
  48 #include <netat/atp.h>
  49 #include <netat/debug.h>
  50
  51 extern atlock_t atpgen_lock;
  52 void atp_free();
  53 void atp_send(struct atp_trans *);
  54
  55 /*
  56  *      The request timer retries a request, if all retries are used up
  57  *              it returns a NAK
  58  */
  59
  60 void
  61 atp_req_timeout(trp)
  62 register struct atp_trans *trp;
  63 {
  64         int s;
  65         register gbuf_t *m;
  66         gref_t *gref;
  67         struct atp_state *atp;
  68         struct atp_trans *ctrp;
  69
  70         if ((atp = trp->tr_queue) == 0)
  71                 return;
  72         ATDISABLE(s, atp->atp_lock);
  73         if (atp->atp_flags & ATP_CLOSING) {
  74                 ATENABLE(s, atp->atp_lock);
  75                 return;
  76         }
  77         for (ctrp = atp->atp_trans_wait.head; ctrp; ctrp = ctrp->tr_list.next) {
  78                 if (ctrp == trp)
  79                         break;
  80         }
  81         if (ctrp != trp) {
  82                 ATENABLE(s, atp->atp_lock);
  83                 return;
  84         }
  85
  86         if ((m = gbuf_cont(trp->tr_xmt)) == NULL)
  87                 m = trp->tr_xmt;               /* issued via the new interface */
  88
  89         if (trp->tr_retry == 0) {
  90                 trp->tr_state = TRANS_FAILED;
  91                 if (m == trp->tr_xmt) {
  92                         trp->tr_xmt = NULL;
  93 l_notify:
  94                                 gbuf_wset(m,1);
  95                                 *gbuf_rptr(m) = 99;
  96                                 gbuf_set_type(m, MSG_DATA);
  97                                 gref = trp->tr_queue->atp_gref;
  98                                 ATENABLE(s, atp->atp_lock);
  99                                 atalk_putnext(gref, m);
 100
 101                         return;
 102                 }
 103                 dPrintf(D_M_ATP_LOW,D_L_INFO, ("atp_req_timeout: skt=%d\n",
 104                         trp->tr_local_socket));
 105                 m = trp->tr_xmt;
 106                 switch(((ioc_t *)(gbuf_rptr(trp->tr_xmt)))->ioc_cmd) {
 107                 case AT_ATP_ISSUE_REQUEST:
 108                         trp->tr_xmt = NULL;
 109                         if (trp->tr_queue->dflag)
 110                                 ((ioc_t *)gbuf_rptr(m))->ioc_cmd = AT_ATP_REQUEST_COMPLETE;
 111                         else if (trp->tr_bdsp == NULL) {
 112                                 ATENABLE(s, atp->atp_lock);
 113                                 gbuf_freem(m);
 114                                 if (trp->tr_rsp_wait)
 115                                         thread_wakeup(&trp->tr_event);
 116                                 break;
 117                         }
 118                         ATENABLE(s, atp->atp_lock);
 119                         atp_iocnak(trp->tr_queue, m, ETIMEDOUT);
 120                         atp_free(trp);
 121                         return;
 122
 123                 case AT_ATP_ISSUE_REQUEST_NOTE:
 124                 case AT_ATP_ISSUE_REQUEST_TICKLE:
 125                         trp->tr_xmt = gbuf_cont(m);
 126                         gbuf_cont(m) = NULL;
 127                         goto l_notify;
 128                 }
 129         } else {
 130                 (AT_ATP_HDR(m))->bitmap = trp->tr_bitmap;
 131
 132                 if (trp->tr_retry != (unsigned int) ATP_INFINITE_RETRIES)
 133                         trp->tr_retry--;
 134                 ATENABLE(s, atp->atp_lock);
 135                 atp_send(trp);
 136         }
 137 }
 138
 139
 140 /*
 141  *      atp_free frees up a request, cleaning up the queues and freeing
 142  *              the request packet
 143  *      always called at 'lock'
 144  */
 145
 146 void atp_free(trp)
 147 register struct atp_trans *trp;
 148 {
 149         register struct atp_state *atp;
 150         register int i;
 151         int s;
 152
 153         dPrintf(D_M_ATP_LOW, D_L_TRACE,
 154                 ("atp_free: freeing trp 0x%x\n", (u_int) trp));
 155         ATDISABLE(s, atpgen_lock);
 156         if (trp->tr_tmo_func)
 157                 atp_untimout(atp_req_timeout, trp);
 158         atp = trp->tr_queue;
 159
 160         ATP_Q_REMOVE(atp->atp_trans_wait, trp, tr_list);
 161
 162         if (trp->tr_xmt) {
 163                 gbuf_freem(trp->tr_xmt);
 164                 trp->tr_xmt = NULL;
 165         }
 166         for (i = 0; i < 8; i++) {
 167                 if (trp->tr_rcv[i]) {
 168                         gbuf_freem(trp->tr_rcv[i]);
 169                         trp->tr_rcv[i] = NULL;
 170                 }
 171         }
 172         if (trp->tr_bdsp) {
 173                 gbuf_freem(trp->tr_bdsp);
 174                 trp->tr_bdsp = NULL;
 175         }
 176
 177         ATENABLE(s, atpgen_lock);
 178         atp_trans_free(trp);
 179
 180 } /* atp_free */
 181
 182
 183 /*
 184  *      atp_send transmits a request packet by queuing it (if it isn't already) and
 185  *              scheduling the queue
 186  */
 187
 188 void atp_send(trp)
 189 register struct atp_trans *trp;
 190 {
 191         gbuf_t *m;
 192         struct atp_state *atp;
 193
 194         dPrintf(D_M_ATP_LOW, D_L_OUTPUT, ("atp_send: trp=0x%x, loc=%d\n",
 195                 (u_int) trp->tr_queue, trp->tr_local_socket));
 196
 197         if ((atp = trp->tr_queue) != 0) {
 198           if (trp->tr_state == TRANS_TIMEOUT) {
 199             if ((m = gbuf_cont(trp->tr_xmt)) == NULL)
 200                 m = trp->tr_xmt;
 201
 202             /*
 203              *  Now either release the transaction or start the timer
 204              */
 205             if (!trp->tr_retry && !trp->tr_bitmap && !trp->tr_xo) {
 206                 m = (gbuf_t *)gbuf_copym(m);
 207                 atp_x_done(trp);
 208             } else {
 209                 m = (gbuf_t *)gbuf_dupm(m);
 210
 211                 atp_timout(atp_req_timeout, trp, trp->tr_timeout);
 212             }
 213
 214             if (m) {
 215                 trace_mbufs(D_M_ATP_LOW, "  m", m);
 216                 DDP_OUTPUT(m);
 217             }
 218         }
 219   }
 220 }
 221
 222
 223 /*
 224  *      atp_reply sends all the available messages in the bitmap again
 225  *              by queueing us to the write service routine
 226  */
 227
 228 void atp_reply(rcbp)
 229 register struct atp_rcb *rcbp;
 230 {
 231         register struct atp_state *atp;
 232         register int i;
 233         int s;
 234
 235   if ((atp = rcbp->rc_queue) != 0) {
 236         ATDISABLE(s, atp->atp_lock);
 237         for (i = 0; i < rcbp->rc_pktcnt; i++) {
 238                 if (rcbp->rc_bitmap&atp_mask[i])
 239                         rcbp->rc_snd[i] = 1;
 240                 else
 241                         rcbp->rc_snd[i] = 0;
 242         }
 243         if (rcbp->rc_rep_waiting == 0) {
 244                 rcbp->rc_state = RCB_SENDING;
 245                 rcbp->rc_rep_waiting = 1;
 246                 ATENABLE(s, atp->atp_lock);
 247                 atp_send_replies(atp, rcbp);
 248         } else
 249         ATENABLE(s, atp->atp_lock);
 250   }
 251 }
 252
 253
 254 /*
 255  *      The rcb timer just frees the rcb, this happens when we missed a release for XO
 256  */
 257
 258 void atp_rcb_timer()
 259 {
 260         int s;
 261         register struct atp_rcb *rcbp;
 262         register struct atp_rcb *next_rcbp;
 263         extern   struct atp_rcb_qhead atp_need_rel;
 264         extern struct atp_trans *trp_tmo_rcb;
 265
 266 l_again:
 267         ATDISABLE(s, atpgen_lock);
 268         for (rcbp = atp_need_rel.head; rcbp; rcbp = next_rcbp) {
 269                 next_rcbp = rcbp->rc_tlist.next;
 270
 271                 if (abs(time.tv_sec - rcbp->rc_timestamp) > 30) {
 272                         ATENABLE(s, atpgen_lock);
 273                         atp_rcb_free(rcbp);
 274                         goto l_again;
 275                 }
 276         }
 277         ATENABLE(s, atpgen_lock);
 278         atp_timout(atp_rcb_timer, trp_tmo_rcb, 10 * HZ);
 279 }
 280
 281 atp_iocack(atp, m)
 282 struct   atp_state *atp;
 283 register gbuf_t *m;
 284 {
 285         if (gbuf_type(m) == MSG_IOCTL)
 286                 gbuf_set_type(m, MSG_IOCACK);
 287         if (gbuf_cont(m))
 288                 ((ioc_t *)gbuf_rptr(m))->ioc_count = gbuf_msgsize(gbuf_cont(m));
 289         else
 290                 ((ioc_t *)gbuf_rptr(m))->ioc_count = 0;
 291
 292         if (atp->dflag)
 293                 asp_ack_reply(atp->atp_gref, m);
 294         else
 295                 atalk_putnext(atp->atp_gref, m);
 296 }
 297
 298 atp_iocnak(atp, m, err)
 299 struct   atp_state *atp;
 300 register gbuf_t *m;
 301 register int err;
 302 {
 303         if (gbuf_type(m) == MSG_IOCTL)
 304                 gbuf_set_type(m, MSG_IOCNAK);
 305         ((ioc_t *)gbuf_rptr(m))->ioc_count = 0;
 306         ((ioc_t *)gbuf_rptr(m))->ioc_error = err ? err : ENXIO;
 307         ((ioc_t *)gbuf_rptr(m))->ioc_rval = -1;
 308         if (gbuf_cont(m)) {
 309                 gbuf_freem(gbuf_cont(m));
 310                 gbuf_cont(m) = NULL;
 311         }
 312
 313         if (atp->dflag)
 314                 asp_nak_reply(atp->atp_gref, m);
 315         else
 316                 atalk_putnext(atp->atp_gref, m);
 317 }
 318
 319 /*
 320  *      Generate a transaction id for a socket
 321  */
 322 static int lasttid;
 323 atp_tid(atp)
 324 register struct atp_state *atp;
 325 {
 326         register int i;
 327         register struct atp_trans *trp;
 328         int s;
 329
 330         ATDISABLE(s, atpgen_lock);
 331         for (i = lasttid;;) {
 332                 i = (i+1)&0xffff;
 333
 334                 for (trp = atp->atp_trans_wait.head; trp; trp = trp->tr_list.next) {
 335                         if (trp->tr_tid == i)
 336                                 break;
 337                 }
 338                 if (trp == NULL) {
 339                         lasttid = i;
 340                         ATENABLE(s, atpgen_lock);
 341                         return(i);
 342                 }
 343         }
 344 }