Commit | Line | Data |
---|---|---|
72e4f44e | 1 | /* if_imp.c 4.26 82/04/24 */ |
6c73ade6 BJ |
2 | |
3 | #include "imp.h" | |
4 | #if NIMP > 0 | |
5 | /* | |
72e4f44e | 6 | * ARPANET IMP interface driver. |
6c73ade6 BJ |
7 | * |
8 | * The IMP-host protocol is handled here, leaving | |
9 | * hardware specifics to the lower level interface driver. | |
10 | */ | |
11 | #include "../h/param.h" | |
12 | #include "../h/systm.h" | |
13 | #include "../h/mbuf.h" | |
14 | #include "../h/pte.h" | |
15 | #include "../h/buf.h" | |
16 | #include "../h/protosw.h" | |
17 | #include "../h/socket.h" | |
18 | #include "../h/ubareg.h" | |
19 | #include "../h/ubavar.h" | |
20 | #include "../h/cpu.h" | |
21 | #include "../h/mtpr.h" | |
22 | #include "../h/vmmac.h" | |
23 | #include "../net/in.h" | |
24 | #include "../net/in_systm.h" | |
25 | #include "../net/if.h" | |
26 | #include "../net/if_imp.h" | |
41e530c7 | 27 | #include "../net/if_imphost.h" |
6c73ade6 BJ |
28 | #include "../net/ip.h" |
29 | #include "../net/ip_var.h" | |
f6311fb6 | 30 | #include "../net/route.h" |
8a2f82db | 31 | #include <errno.h> |
6c73ade6 BJ |
32 | |
33 | /* | |
34 | * IMP software status per interface. | |
35 | * (partially shared with the hardware specific module) | |
36 | * | |
37 | * Each interface is referenced by a network interface structure, | |
38 | * imp_if, which the routing code uses to locate the interface. | |
39 | * This structure contains the output queue for the interface, its | |
40 | * address, ... IMP specific structures used in connecting the | |
41 | * IMP software modules to the hardware specific interface routines | |
a2cd4df7 BJ |
42 | * are stored here. The common structures are made visible to the |
43 | * interface driver by passing a pointer to the hardware routine | |
44 | * at "attach" time. | |
6c73ade6 BJ |
45 | * |
46 | * NOTE: imp_if and imp_cb are assumed adjacent in hardware code. | |
47 | */ | |
48 | struct imp_softc { | |
49 | struct ifnet imp_if; /* network visible interface */ | |
50 | struct impcb imp_cb; /* hooks to hardware module */ | |
51 | u_char imp_state; /* current state of IMP */ | |
52 | char imp_dropcnt; /* used during initialization */ | |
6c73ade6 BJ |
53 | } imp_softc[NIMP]; |
54 | ||
55 | /* | |
56 | * Messages from IMP regarding why | |
57 | * it's going down. | |
58 | */ | |
e33b5b1a | 59 | static char *impmessage[] = { |
6c73ade6 BJ |
60 | "in 30 seconds", |
61 | "for hardware PM", | |
62 | "to reload software", | |
63 | "for emergency reset" | |
64 | }; | |
65 | ||
a2cd4df7 BJ |
66 | int impdown(), impinit(), impoutput(); |
67 | ||
6c73ade6 BJ |
68 | /* |
69 | * IMP attach routine. Called from hardware device attach routine | |
70 | * at configuration time with a pointer to the UNIBUS device structure. | |
71 | * Sets up local state and returns pointer to base of ifnet+impcb | |
72 | * structures. This is then used by the device's attach routine | |
73 | * set up its back pointers. | |
74 | */ | |
75 | impattach(ui) | |
76 | struct uba_device *ui; | |
77 | { | |
78 | struct imp_softc *sc = &imp_softc[ui->ui_unit]; | |
79 | register struct ifnet *ifp = &sc->imp_if; | |
ee787340 | 80 | struct sockaddr_in *sin; |
6c73ade6 BJ |
81 | |
82 | COUNT(IMPATTACH); | |
83 | /* UNIT COULD BE AMBIGUOUS */ | |
84 | ifp->if_unit = ui->ui_unit; | |
85 | ifp->if_name = "imp"; | |
e431883e | 86 | ifp->if_mtu = IMPMTU - sizeof(struct imp_leader); |
6c73ade6 | 87 | ifp->if_net = ui->ui_flags; |
aee8ddf8 | 88 | /* the host and imp fields will be filled in by the imp */ |
ee787340 SL |
89 | sin = (struct sockaddr_in *)&ifp->if_addr; |
90 | sin->sin_family = AF_INET; | |
91 | sin->sin_addr = if_makeaddr(ifp->if_net, 0); | |
a2cd4df7 BJ |
92 | ifp->if_init = impinit; |
93 | ifp->if_output = impoutput; | |
94 | /* reset is handled at the hardware level */ | |
6c73ade6 | 95 | if_attach(ifp); |
6c73ade6 BJ |
96 | return ((int)&sc->imp_if); |
97 | } | |
98 | ||
99 | /* | |
100 | * IMP initialization routine: call hardware module to | |
101 | * setup UNIBUS resources, init state and get ready for | |
102 | * NOOPs the IMP should send us, and that we want to drop. | |
103 | */ | |
104 | impinit(unit) | |
105 | int unit; | |
106 | { | |
98b6195e | 107 | int s = splimp(); |
6c73ade6 BJ |
108 | register struct imp_softc *sc = &imp_softc[unit]; |
109 | ||
98b6195e | 110 | COUNT(IMPINIT); |
a2cd4df7 BJ |
111 | if ((*sc->imp_cb.ic_init)(unit) == 0) { |
112 | sc->imp_state = IMPS_DOWN; | |
ee787340 | 113 | sc->imp_if.if_flags &= ~IFF_UP; |
98b6195e | 114 | splx(s); |
a2cd4df7 BJ |
115 | return; |
116 | } | |
6c73ade6 | 117 | sc->imp_state = IMPS_INIT; |
a2cd4df7 | 118 | impnoops(sc); |
f6311fb6 | 119 | if_rtinit(&sc->imp_if, RTF_DIRECT|RTF_UP); |
98b6195e | 120 | splx(s); |
6c73ade6 BJ |
121 | } |
122 | ||
123 | struct sockproto impproto = { PF_IMPLINK }; | |
faad37c0 SL |
124 | struct sockaddr_in impdst = { AF_IMPLINK }; |
125 | struct sockaddr_in impsrc = { AF_IMPLINK }; | |
6c73ade6 BJ |
126 | |
127 | /* | |
128 | * ARPAnet 1822 input routine. | |
129 | * Called from hardware input interrupt routine to handle 1822 | |
130 | * IMP-host messages. Type 0 messages (non-control) are | |
131 | * passed to higher level protocol processors on the basis | |
132 | * of link number. Other type messages (control) are handled here. | |
133 | */ | |
a2cd4df7 | 134 | impinput(unit, m) |
6c73ade6 | 135 | int unit; |
a2cd4df7 | 136 | register struct mbuf *m; |
6c73ade6 | 137 | { |
6c73ade6 BJ |
138 | register struct imp_leader *ip; |
139 | register struct imp_softc *sc = &imp_softc[unit]; | |
140 | register struct host *hp; | |
141 | register struct ifqueue *inq; | |
a2cd4df7 | 142 | struct control_leader *cp; |
6c73ade6 | 143 | struct in_addr addr; |
e33b5b1a | 144 | struct mbuf *next; |
ee787340 | 145 | struct sockaddr_in *sin; |
6c73ade6 | 146 | |
5cda82aa | 147 | COUNT(IMPINPUT); |
34c22ab5 | 148 | /* verify leader length. */ |
a2cd4df7 BJ |
149 | if (m->m_len < sizeof(struct control_leader) && |
150 | (m = m_pullup(m, sizeof(struct control_leader))) == 0) | |
151 | return; | |
152 | cp = mtod(m, struct control_leader *); | |
153 | if (cp->dl_mtype == IMPTYPE_DATA) | |
154 | if (m->m_len < sizeof(struct imp_leader) && | |
155 | (m = m_pullup(m, sizeof(struct imp_leader))) == 0) | |
156 | return; | |
6c73ade6 BJ |
157 | ip = mtod(m, struct imp_leader *); |
158 | ||
34c22ab5 | 159 | /* check leader type */ |
a2cd4df7 BJ |
160 | if (ip->il_format != IMP_NFF) { |
161 | sc->imp_if.if_collisions++; /* XXX */ | |
6c73ade6 | 162 | goto drop; |
a2cd4df7 | 163 | } |
6c73ade6 BJ |
164 | |
165 | /* | |
166 | * Certain messages require a host structure. | |
167 | * Do this in one shot here. | |
168 | */ | |
169 | switch (ip->il_mtype) { | |
170 | ||
171 | case IMPTYPE_RFNM: | |
172 | case IMPTYPE_INCOMPLETE: | |
173 | case IMPTYPE_HOSTDEAD: | |
174 | case IMPTYPE_HOSTUNREACH: | |
175 | case IMPTYPE_BADDATA: | |
41e530c7 | 176 | #ifdef notdef |
a2cd4df7 | 177 | addr.s_net = ip->il_network; |
41e530c7 BJ |
178 | #else |
179 | addr.s_net = 0; | |
180 | #endif | |
a2cd4df7 BJ |
181 | addr.s_imp = ip->il_imp; |
182 | addr.s_host = ip->il_host; | |
183 | hp = hostlookup(addr); | |
6c73ade6 BJ |
184 | break; |
185 | } | |
186 | ||
187 | switch (ip->il_mtype) { | |
188 | ||
6c73ade6 | 189 | case IMPTYPE_DATA: |
6c73ade6 BJ |
190 | break; |
191 | ||
192 | /* | |
193 | * IMP leader error. Reset the IMP and discard the packet. | |
194 | */ | |
195 | case IMPTYPE_BADLEADER: | |
a0b7c7fb SL |
196 | /* |
197 | * According to 1822 document, this message | |
198 | * will be generated in response to the | |
199 | * first noop sent to the IMP after | |
200 | * the host resets the IMP interface. | |
201 | */ | |
a2cd4df7 | 202 | if (sc->imp_state != IMPS_INIT) { |
e33b5b1a | 203 | impmsg(sc, "leader error"); |
72e4f44e | 204 | hostreset(sc->imp_if.if_net); |
a0b7c7fb SL |
205 | impnoops(sc); |
206 | } | |
72e4f44e | 207 | goto drop; |
6c73ade6 BJ |
208 | |
209 | /* | |
210 | * IMP going down. Print message, and if not immediate, | |
211 | * set off a timer to insure things will be reset at the | |
212 | * appropriate time. | |
213 | */ | |
214 | case IMPTYPE_DOWN: | |
215 | if ((ip->il_link & IMP_DMASK) == 0) { | |
216 | sc->imp_state = IMPS_GOINGDOWN; | |
668cc26d | 217 | timeout(impdown, (caddr_t)sc, 30 * hz); |
6c73ade6 | 218 | } |
668cc26d SL |
219 | impmsg(sc, "going down %s", |
220 | (u_int)impmessage[ip->il_link&IMP_DMASK]); | |
72e4f44e | 221 | goto drop; |
6c73ade6 BJ |
222 | |
223 | /* | |
224 | * A NOP usually seen during the initialization sequence. | |
225 | * Compare the local address with that in the message. | |
226 | * Reset the local address notion if it doesn't match. | |
227 | */ | |
ee787340 | 228 | case IMPTYPE_NOOP: |
a0b7c7fb SL |
229 | if (sc->imp_state == IMPS_DOWN) { |
230 | sc->imp_state = IMPS_INIT; | |
231 | sc->imp_dropcnt = IMP_DROPCNT; | |
232 | } | |
98b6195e | 233 | if (sc->imp_state == IMPS_INIT && --sc->imp_dropcnt > 0) |
e431883e | 234 | goto drop; |
98b6195e SL |
235 | sin = (struct sockaddr_in *)&sc->imp_if.if_addr; |
236 | if (sin->sin_addr.s_host != ip->il_host || | |
237 | sin->sin_addr.s_imp != ip->il_imp) { | |
238 | sc->imp_if.if_host[0] = | |
239 | sin->sin_addr.s_host = ip->il_host; | |
240 | sin->sin_addr.s_imp = ip->il_imp; | |
241 | impmsg(sc, "reset (host %d/imp %d)", (u_int)ip->il_host, | |
242 | ntohs(ip->il_imp)); | |
243 | } | |
a2cd4df7 | 244 | sc->imp_state = IMPS_UP; |
ee787340 | 245 | sc->imp_if.if_flags |= IFF_UP; |
a2cd4df7 BJ |
246 | /* restart output in case something was q'd */ |
247 | (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); | |
e431883e | 248 | goto drop; |
6c73ade6 BJ |
249 | |
250 | /* | |
72e4f44e SL |
251 | * RFNM or INCOMPLETE message, send next |
252 | * message on the q. We could pass incomplete's | |
253 | * up to the next level, but this currently isn't | |
254 | * needed. | |
6c73ade6 BJ |
255 | */ |
256 | case IMPTYPE_RFNM: | |
257 | case IMPTYPE_INCOMPLETE: | |
72e4f44e SL |
258 | if (hp && hp->h_rfnm && (next = hostdeque(hp))) |
259 | (void) impsnd(&sc->imp_if, next); | |
e431883e | 260 | goto drop; |
6c73ade6 BJ |
261 | |
262 | /* | |
263 | * Host or IMP can't be reached. Flush any packets | |
264 | * awaiting transmission and release the host structure. | |
6c73ade6 BJ |
265 | */ |
266 | case IMPTYPE_HOSTDEAD: | |
267 | case IMPTYPE_HOSTUNREACH: | |
72e4f44e | 268 | impnotify(ip->il_mtype, ip, hp); |
41e530c7 | 269 | goto rawlinkin; |
6c73ade6 BJ |
270 | |
271 | /* | |
272 | * Error in data. Clear RFNM status for this host and send | |
273 | * noops to the IMP to clear the interface. | |
274 | */ | |
275 | case IMPTYPE_BADDATA: | |
e33b5b1a | 276 | impmsg(sc, "data error"); |
6c73ade6 BJ |
277 | if (hp) |
278 | hp->h_rfnm = 0; | |
279 | impnoops(sc); | |
72e4f44e | 280 | goto drop; |
6c73ade6 BJ |
281 | |
282 | /* | |
a0b7c7fb | 283 | * Interface reset. |
6c73ade6 BJ |
284 | */ |
285 | case IMPTYPE_RESET: | |
e33b5b1a | 286 | impmsg(sc, "interface reset"); |
a0b7c7fb | 287 | impnoops(sc); |
72e4f44e | 288 | goto drop; |
6c73ade6 BJ |
289 | |
290 | default: | |
291 | sc->imp_if.if_collisions++; /* XXX */ | |
72e4f44e | 292 | goto drop; |
6c73ade6 BJ |
293 | } |
294 | ||
295 | /* | |
34c22ab5 BJ |
296 | * Data for a protocol. Dispatch to the appropriate |
297 | * protocol routine (running at software interrupt). | |
298 | * If this isn't a raw interface, advance pointer | |
299 | * into mbuf past leader. | |
6c73ade6 BJ |
300 | */ |
301 | switch (ip->il_link) { | |
302 | ||
303 | #ifdef INET | |
304 | case IMPLINK_IP: | |
305 | m->m_len -= sizeof(struct imp_leader); | |
306 | m->m_off += sizeof(struct imp_leader); | |
9c8692e9 | 307 | schednetisr(NETISR_IP); |
6c73ade6 BJ |
308 | inq = &ipintrq; |
309 | break; | |
310 | #endif | |
311 | ||
312 | default: | |
654fef96 | 313 | rawlinkin: |
6c73ade6 | 314 | impproto.sp_protocol = ip->il_link; |
ee787340 SL |
315 | sin = (struct sockaddr_in *)&sc->imp_if.if_addr; |
316 | impdst.sin_addr = sin->sin_addr;; | |
faad37c0 SL |
317 | impsrc.sin_addr.s_net = ip->il_network; |
318 | impsrc.sin_addr.s_host = ip->il_host; | |
319 | impsrc.sin_addr.s_imp = ip->il_imp; | |
57aa3090 SL |
320 | raw_input(m, &impproto, (struct sockaddr *)&impsrc, |
321 | (struct sockaddr *)&impdst); | |
6c73ade6 BJ |
322 | return; |
323 | } | |
1e977657 BJ |
324 | if (IF_QFULL(inq)) { |
325 | IF_DROP(inq); | |
326 | goto drop; | |
327 | } | |
6c73ade6 BJ |
328 | IF_ENQUEUE(inq, m); |
329 | return; | |
330 | ||
331 | drop: | |
332 | m_freem(m); | |
333 | } | |
334 | ||
a0b7c7fb SL |
335 | /* |
336 | * Bring the IMP down after notification. | |
337 | */ | |
338 | impdown(sc) | |
339 | struct imp_softc *sc; | |
340 | { | |
1e977657 | 341 | |
a0b7c7fb | 342 | sc->imp_state = IMPS_DOWN; |
e33b5b1a | 343 | impmsg(sc, "marked down"); |
72e4f44e | 344 | if_down(&sc->imp_if); |
a0b7c7fb SL |
345 | } |
346 | ||
6c73ade6 | 347 | /*VARARGS*/ |
e33b5b1a | 348 | impmsg(sc, fmt, a1, a2) |
6c73ade6 BJ |
349 | struct imp_softc *sc; |
350 | char *fmt; | |
668cc26d | 351 | u_int a1; |
6c73ade6 | 352 | { |
1e977657 | 353 | |
6c73ade6 BJ |
354 | printf("imp%d: ", sc->imp_if.if_unit); |
355 | printf(fmt, a1, a2); | |
356 | printf("\n"); | |
357 | } | |
358 | ||
72e4f44e SL |
359 | /* |
360 | * Process an IMP "error" message, passing this | |
361 | * up to the higher level protocol. | |
362 | */ | |
363 | impnotify(what, cp, hp) | |
364 | int what; | |
365 | struct control_leader *cp; | |
366 | struct host *hp; | |
367 | { | |
368 | struct in_addr in; | |
369 | ||
370 | #ifdef notdef | |
371 | in.s_net = cp->dl_network; | |
372 | #else | |
373 | in.s_net = 10; | |
374 | #endif | |
375 | in.s_host = cp->dl_host; | |
376 | in.s_imp = cp->dl_imp; | |
377 | if (cp->dl_link != IMPLINK_IP) | |
378 | raw_ctlinput(what, (caddr_t)&in); | |
379 | else | |
380 | ip_ctlinput(what, (caddr_t)&in); | |
381 | if (hp) | |
382 | hostfree(hp); | |
383 | } | |
384 | ||
6c73ade6 BJ |
385 | /* |
386 | * ARPAnet 1822 output routine. | |
387 | * Called from higher level protocol routines to set up messages for | |
388 | * transmission to the imp. Sets up the header and calls impsnd to | |
389 | * enqueue the message for this IMP's hardware driver. | |
390 | */ | |
ee787340 | 391 | impoutput(ifp, m0, dst) |
6c73ade6 BJ |
392 | register struct ifnet *ifp; |
393 | struct mbuf *m0; | |
ee787340 | 394 | struct sockaddr *dst; |
6c73ade6 BJ |
395 | { |
396 | register struct imp_leader *imp; | |
397 | register struct mbuf *m = m0; | |
1e63a6ab | 398 | int x, dhost, dimp, dlink, len, dnet; |
8a2f82db | 399 | int error = 0; |
6c73ade6 | 400 | |
a2cd4df7 | 401 | COUNT(IMPOUTPUT); |
6c73ade6 BJ |
402 | /* |
403 | * Don't even try if the IMP is unavailable. | |
404 | */ | |
8a2f82db SL |
405 | if (imp_softc[ifp->if_unit].imp_state != IMPS_UP) { |
406 | error = ENETDOWN; | |
a0b7c7fb | 407 | goto drop; |
8a2f82db | 408 | } |
6c73ade6 | 409 | |
ee787340 | 410 | switch (dst->sa_family) { |
6c73ade6 BJ |
411 | |
412 | #ifdef INET | |
ee787340 SL |
413 | case AF_INET: { |
414 | struct ip *ip = mtod(m0, struct ip *); | |
415 | struct sockaddr_in *sin = (struct sockaddr_in *)dst; | |
6c73ade6 | 416 | |
ee787340 SL |
417 | dhost = sin->sin_addr.s_host; |
418 | dimp = sin->sin_addr.s_impno; | |
6c73ade6 | 419 | dlink = IMPLINK_IP; |
1e63a6ab | 420 | dnet = 0; |
668cc26d | 421 | len = ntohs((u_short)ip->ip_len); |
6c73ade6 BJ |
422 | break; |
423 | } | |
424 | #endif | |
ee787340 | 425 | case AF_IMPLINK: |
6c73ade6 BJ |
426 | goto leaderexists; |
427 | ||
428 | default: | |
ee787340 SL |
429 | printf("imp%d: can't handle af%d\n", ifp->if_unit, |
430 | dst->sa_family); | |
8a2f82db | 431 | error = EAFNOSUPPORT; |
a0b7c7fb | 432 | goto drop; |
6c73ade6 BJ |
433 | } |
434 | ||
435 | /* | |
436 | * Add IMP leader. If there's not enough space in the | |
437 | * first mbuf, allocate another. If that should fail, we | |
438 | * drop this sucker. | |
439 | */ | |
440 | if (m->m_off > MMAXOFF || | |
441 | MMINOFF + sizeof(struct imp_leader) > m->m_off) { | |
442 | m = m_get(M_DONTWAIT); | |
8a2f82db SL |
443 | if (m == 0) { |
444 | error = ENOBUFS; | |
a0b7c7fb | 445 | goto drop; |
8a2f82db | 446 | } |
6c73ade6 BJ |
447 | m->m_next = m0; |
448 | m->m_off = MMINOFF; | |
449 | m->m_len = sizeof(struct imp_leader); | |
450 | } else { | |
451 | m->m_off -= sizeof(struct imp_leader); | |
452 | m->m_len += sizeof(struct imp_leader); | |
453 | } | |
454 | imp = mtod(m, struct imp_leader *); | |
455 | imp->il_format = IMP_NFF; | |
41e530c7 | 456 | imp->il_mtype = IMPTYPE_DATA; |
1e63a6ab | 457 | imp->il_network = dnet; |
6c73ade6 | 458 | imp->il_host = dhost; |
1e63a6ab | 459 | imp->il_imp = htons((u_short)dimp); |
668cc26d SL |
460 | imp->il_length = |
461 | htons((u_short)(len + sizeof(struct imp_leader)) << 3); | |
6c73ade6 | 462 | imp->il_link = dlink; |
41e530c7 | 463 | imp->il_flags = imp->il_htype = imp->il_subtype = 0; |
6c73ade6 BJ |
464 | |
465 | leaderexists: | |
6c73ade6 | 466 | return (impsnd(ifp, m)); |
a0b7c7fb SL |
467 | drop: |
468 | m_freem(m0); | |
8a2f82db | 469 | return (error); |
6c73ade6 BJ |
470 | } |
471 | ||
472 | /* | |
473 | * Put a message on an interface's output queue. | |
474 | * Perform RFNM counting: no more than 8 message may be | |
475 | * in flight to any one host. | |
476 | */ | |
477 | impsnd(ifp, m) | |
478 | struct ifnet *ifp; | |
479 | struct mbuf *m; | |
480 | { | |
481 | register struct imp_leader *ip; | |
482 | register struct host *hp; | |
483 | struct impcb *icp; | |
484 | int x; | |
485 | ||
a2cd4df7 | 486 | COUNT(IMPSND); |
6c73ade6 BJ |
487 | ip = mtod(m, struct imp_leader *); |
488 | ||
489 | /* | |
490 | * Do RFNM counting for data messages | |
491 | * (no more than 8 outstanding to any host) | |
492 | */ | |
fcd78660 | 493 | x = splimp(); |
6c73ade6 BJ |
494 | if (ip->il_mtype == IMPTYPE_DATA) { |
495 | struct in_addr addr; | |
496 | ||
41e530c7 | 497 | #ifdef notdef |
a2cd4df7 | 498 | addr.s_net = ip->il_network; |
41e530c7 BJ |
499 | #else |
500 | addr.s_net = 0; | |
501 | #endif | |
6c73ade6 BJ |
502 | addr.s_host = ip->il_host; |
503 | addr.s_imp = ip->il_imp; | |
a2cd4df7 BJ |
504 | if ((hp = hostlookup(addr)) == 0) |
505 | hp = hostenter(addr); | |
6c73ade6 BJ |
506 | |
507 | /* | |
a0b7c7fb | 508 | * If IMP would block, queue until RFNM |
6c73ade6 BJ |
509 | */ |
510 | if (hp) { | |
6c73ade6 BJ |
511 | if (hp->h_rfnm < 8) { |
512 | hp->h_rfnm++; | |
513 | goto enque; | |
514 | } | |
fcd78660 BJ |
515 | if (hp->h_qcnt < 8) { /* high water mark */ |
516 | HOST_ENQUE(hp, m); | |
517 | goto start; | |
518 | } | |
6c73ade6 | 519 | } |
6c73ade6 | 520 | m_freem(m); |
41e530c7 | 521 | splx(x); |
8a2f82db | 522 | return (ENOBUFS); /* XXX */ |
6c73ade6 BJ |
523 | } |
524 | enque: | |
1e977657 BJ |
525 | if (IF_QFULL(&ifp->if_snd)) { |
526 | IF_DROP(&ifp->if_snd); | |
527 | m_freem(m); | |
528 | splx(x); | |
8a2f82db | 529 | return (ENOBUFS); /* XXX */ |
1e977657 | 530 | } |
6c73ade6 | 531 | IF_ENQUEUE(&ifp->if_snd, m); |
6c73ade6 | 532 | start: |
fcd78660 | 533 | splx(x); |
6c73ade6 BJ |
534 | icp = &imp_softc[ifp->if_unit].imp_cb; |
535 | if (icp->ic_oactive == 0) | |
536 | (*icp->ic_start)(ifp->if_unit); | |
8a2f82db | 537 | return (0); |
6c73ade6 BJ |
538 | } |
539 | ||
540 | /* | |
541 | * Put three 1822 NOOPs at the head of the output queue. | |
542 | * Part of host-IMP initialization procedure. | |
543 | * (Should return success/failure, but noone knows | |
544 | * what to do with this, so why bother?) | |
545 | */ | |
546 | impnoops(sc) | |
547 | register struct imp_softc *sc; | |
548 | { | |
549 | register i; | |
550 | register struct mbuf *m; | |
a2cd4df7 | 551 | register struct control_leader *cp; |
6c73ade6 BJ |
552 | int x; |
553 | ||
a2cd4df7 | 554 | COUNT(IMPNOOPS); |
6c73ade6 | 555 | sc->imp_dropcnt = IMP_DROPCNT; |
a2cd4df7 | 556 | for (i = 0; i < IMP_DROPCNT + 1; i++ ) { |
6c73ade6 BJ |
557 | if ((m = m_getclr(M_DONTWAIT)) == 0) |
558 | return; | |
559 | m->m_off = MMINOFF; | |
a2cd4df7 BJ |
560 | m->m_len = sizeof(struct control_leader); |
561 | cp = mtod(m, struct control_leader *); | |
562 | cp->dl_format = IMP_NFF; | |
563 | cp->dl_link = i; | |
564 | cp->dl_mtype = IMPTYPE_NOOP; | |
6c73ade6 BJ |
565 | x = splimp(); |
566 | IF_PREPEND(&sc->imp_if.if_snd, m); | |
567 | splx(x); | |
568 | } | |
569 | if (sc->imp_cb.ic_oactive == 0) | |
570 | (*sc->imp_cb.ic_start)(sc->imp_if.if_unit); | |
571 | } | |
41e530c7 | 572 | #endif |