Commit | Line | Data |
---|---|---|
1dd55890 | 1 | /* if_en.c 4.37 82/03/09 */ |
11720282 BJ |
2 | |
3 | #include "en.h" | |
f1b2fa5b | 4 | |
11720282 | 5 | /* |
f1b2fa5b | 6 | * Xerox prototype (3 Mb) Ethernet interface driver. |
11720282 BJ |
7 | */ |
8 | ||
9 | #include "../h/param.h" | |
10 | #include "../h/systm.h" | |
11 | #include "../h/mbuf.h" | |
11720282 BJ |
12 | #include "../h/pte.h" |
13 | #include "../h/buf.h" | |
8a13b737 BJ |
14 | #include "../h/protosw.h" |
15 | #include "../h/socket.h" | |
11720282 BJ |
16 | #include "../h/ubareg.h" |
17 | #include "../h/ubavar.h" | |
11720282 | 18 | #include "../h/enreg.h" |
11720282 | 19 | #include "../h/cpu.h" |
8a13b737 BJ |
20 | #include "../h/mtpr.h" |
21 | #include "../h/vmmac.h" | |
22 | #include "../net/in.h" | |
23 | #include "../net/in_systm.h" | |
24 | #include "../net/if.h" | |
25 | #include "../net/if_en.h" | |
26 | #include "../net/if_uba.h" | |
27 | #include "../net/ip.h" | |
28 | #include "../net/ip_var.h" | |
31c2345c | 29 | #include "../net/pup.h" |
8a13b737 | 30 | |
a453e1b5 | 31 | #define ENMTU (1024+512) |
11720282 | 32 | |
11720282 BJ |
33 | int enprobe(), enattach(), enrint(), enxint(), encollide(); |
34 | struct uba_device *eninfo[NEN]; | |
35 | u_short enstd[] = { 0 }; | |
36 | struct uba_driver endriver = | |
b454c3ea | 37 | { enprobe, 0, enattach, 0, enstd, "en", eninfo }; |
11720282 BJ |
38 | #define ENUNIT(x) minor(x) |
39 | ||
f1b2fa5b BJ |
40 | int eninit(),enoutput(),enreset(); |
41 | ||
42 | /* | |
43 | * Ethernet software status per interface. | |
44 | * | |
45 | * Each interface is referenced by a network interface structure, | |
46 | * es_if, which the routing code uses to locate the interface. | |
47 | * This structure contains the output queue for the interface, its address, ... | |
48 | * We also have, for each interface, a UBA interface structure, which | |
49 | * contains information about the UNIBUS resources held by the interface: | |
50 | * map registers, buffered data paths, etc. Information is cached in this | |
51 | * structure for use by the if_uba.c routines in running the interface | |
52 | * efficiently. | |
53 | */ | |
8a13b737 | 54 | struct en_softc { |
f1b2fa5b BJ |
55 | struct ifnet es_if; /* network-visible interface */ |
56 | struct ifuba es_ifuba; /* UNIBUS resources */ | |
57 | short es_delay; /* current output delay */ | |
58 | short es_mask; /* mask for current output delay */ | |
59 | u_char es_lastx; /* host last transmitted to */ | |
60 | short es_oactive; /* is output active? */ | |
61 | short es_olen; /* length of last output */ | |
8a13b737 | 62 | } en_softc[NEN]; |
11720282 | 63 | |
f1b2fa5b BJ |
64 | /* |
65 | * Do output DMA to determine interface presence and | |
66 | * interrupt vector. DMA is too short to disturb other hosts. | |
67 | */ | |
11720282 BJ |
68 | enprobe(reg) |
69 | caddr_t reg; | |
70 | { | |
b454c3ea | 71 | register int br, cvec; /* r11, r10 value-result */ |
11720282 BJ |
72 | register struct endevice *addr = (struct endevice *)reg; |
73 | ||
8a13b737 | 74 | COUNT(ENPROBE); |
11720282 BJ |
75 | #ifdef lint |
76 | br = 0; cvec = br; br = cvec; | |
2b4b57cd | 77 | enrint(0); enxint(0); encollide(0); |
11720282 | 78 | #endif |
11720282 | 79 | addr->en_istat = 0; |
11720282 BJ |
80 | addr->en_owc = -1; |
81 | addr->en_oba = 0; | |
941ee7ef | 82 | addr->en_ostat = EN_IEN|EN_GO; |
11720282 BJ |
83 | DELAY(100000); |
84 | addr->en_ostat = 0; | |
11720282 BJ |
85 | return (1); |
86 | } | |
87 | ||
f1b2fa5b BJ |
88 | /* |
89 | * Interface exists: make available by filling in network interface | |
90 | * record. System will initialize the interface when it is ready | |
91 | * to accept packets. | |
92 | */ | |
11720282 BJ |
93 | enattach(ui) |
94 | struct uba_device *ui; | |
95 | { | |
f1b2fa5b | 96 | register struct en_softc *es = &en_softc[ui->ui_unit]; |
8a13b737 | 97 | COUNT(ENATTACH); |
f1b2fa5b BJ |
98 | |
99 | es->es_if.if_unit = ui->ui_unit; | |
b454c3ea | 100 | es->es_if.if_name = "en"; |
f1b2fa5b BJ |
101 | es->es_if.if_mtu = ENMTU; |
102 | es->es_if.if_net = ui->ui_flags; | |
103 | es->es_if.if_host[0] = | |
a453e1b5 | 104 | (~(((struct endevice *)eninfo[ui->ui_unit]->ui_addr)->en_addr)) & 0xff; |
f7bbb8eb BJ |
105 | #ifdef ENKLUDGE |
106 | if (es->es_if.if_net == 10) { | |
107 | es->es_if.if_host[0] <<= 16; | |
108 | es->es_if.if_host[0] |= 0x4e; | |
109 | } | |
110 | #endif | |
f1b2fa5b BJ |
111 | es->es_if.if_addr = |
112 | if_makeaddr(es->es_if.if_net, es->es_if.if_host[0]); | |
1dd55890 BJ |
113 | es->es_if.if_broadaddr = |
114 | if_makeaddr(es->es_if.if_net, 0); | |
f1b2fa5b | 115 | es->es_if.if_init = eninit; |
b454c3ea | 116 | es->es_if.if_output = enoutput; |
f1b2fa5b | 117 | es->es_if.if_ubareset = enreset; |
7a66118b | 118 | es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16; |
405c9168 | 119 | if_attach(&es->es_if); |
11720282 BJ |
120 | } |
121 | ||
f1b2fa5b BJ |
122 | /* |
123 | * Reset of interface after UNIBUS reset. | |
124 | * If interface is on specified uba, reset its state. | |
125 | */ | |
126 | enreset(unit, uban) | |
127 | int unit, uban; | |
8a13b737 | 128 | { |
11720282 | 129 | register struct uba_device *ui; |
f1b2fa5b | 130 | COUNT(ENRESET); |
11720282 | 131 | |
b454c3ea BJ |
132 | if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 || |
133 | ui->ui_ubanum != uban) | |
f1b2fa5b | 134 | return; |
b454c3ea | 135 | printf(" en%d", unit); |
f1b2fa5b BJ |
136 | eninit(unit); |
137 | } | |
138 | ||
139 | /* | |
140 | * Initialization of interface; clear recorded pending | |
141 | * operations, and reinitialize UNIBUS usage. | |
142 | */ | |
143 | eninit(unit) | |
144 | int unit; | |
145 | { | |
b454c3ea BJ |
146 | register struct en_softc *es = &en_softc[unit]; |
147 | register struct uba_device *ui = eninfo[unit]; | |
f1b2fa5b | 148 | register struct endevice *addr; |
f1b2fa5b BJ |
149 | int s; |
150 | ||
f1b2fa5b | 151 | if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, |
81950b45 | 152 | sizeof (struct en_header), (int)btoc(ENMTU)) == 0) { |
b454c3ea | 153 | printf("en%d: can't initialize\n", unit); |
8a13b737 | 154 | return; |
11720282 | 155 | } |
11720282 | 156 | addr = (struct endevice *)ui->ui_addr; |
8a13b737 | 157 | addr->en_istat = addr->en_ostat = 0; |
11720282 | 158 | |
f1b2fa5b | 159 | /* |
b454c3ea BJ |
160 | * Hang a receive and start any |
161 | * pending writes by faking a transmit complete. | |
f1b2fa5b BJ |
162 | */ |
163 | s = splimp(); | |
b454c3ea BJ |
164 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; |
165 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; | |
166 | addr->en_istat = EN_IEN|EN_GO; | |
167 | es->es_oactive = 1; | |
f1b2fa5b BJ |
168 | enxint(unit); |
169 | splx(s); | |
11720282 BJ |
170 | } |
171 | ||
3552a746 | 172 | int enlastdel = 25; |
8a13b737 | 173 | |
f1b2fa5b BJ |
174 | /* |
175 | * Start or restart output on interface. | |
176 | * If interface is already active, then this is a retransmit | |
177 | * after a collision, and just restuff registers and delay. | |
178 | * If interface is not already active, get another datagram | |
179 | * to send off of the interface queue, and map it to the interface | |
180 | * before starting the output. | |
181 | */ | |
ae348eea | 182 | enstart(dev) |
11720282 BJ |
183 | dev_t dev; |
184 | { | |
b454c3ea BJ |
185 | int unit = ENUNIT(dev); |
186 | struct uba_device *ui = eninfo[unit]; | |
187 | register struct en_softc *es = &en_softc[unit]; | |
8a13b737 | 188 | register struct endevice *addr; |
8a13b737 BJ |
189 | struct mbuf *m; |
190 | int dest; | |
ae348eea | 191 | COUNT(ENSTART); |
11720282 | 192 | |
8a13b737 BJ |
193 | if (es->es_oactive) |
194 | goto restart; | |
f1b2fa5b BJ |
195 | |
196 | /* | |
197 | * Not already active: dequeue another request | |
198 | * and map it to the UNIBUS. If no more requests, | |
199 | * just return. | |
200 | */ | |
201 | IF_DEQUEUE(&es->es_if.if_snd, m); | |
8a13b737 BJ |
202 | if (m == 0) { |
203 | es->es_oactive = 0; | |
11720282 BJ |
204 | return; |
205 | } | |
a453e1b5 | 206 | dest = mtod(m, struct en_header *)->en_dhost; |
8a13b737 | 207 | es->es_olen = if_wubaput(&es->es_ifuba, m); |
f1b2fa5b BJ |
208 | |
209 | /* | |
210 | * Ethernet cannot take back-to-back packets (no | |
211 | * buffering in interface. To avoid overrunning | |
212 | * receiver, enforce a small delay (about 1ms) in interface | |
213 | * on successive packets sent to same host. | |
214 | */ | |
8a13b737 BJ |
215 | if (es->es_lastx && es->es_lastx == dest) |
216 | es->es_delay = enlastdel; | |
217 | else | |
218 | es->es_lastx = dest; | |
f1b2fa5b | 219 | |
8a13b737 | 220 | restart: |
f1b2fa5b BJ |
221 | /* |
222 | * Have request mapped to UNIBUS for transmission. | |
223 | * Purge any stale data from this BDP, and start the otput. | |
224 | */ | |
225 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); | |
11720282 | 226 | addr = (struct endevice *)ui->ui_addr; |
405c9168 | 227 | addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; |
8a13b737 BJ |
228 | addr->en_odelay = es->es_delay; |
229 | addr->en_owc = -((es->es_olen + 1) >> 1); | |
941ee7ef | 230 | addr->en_ostat = EN_IEN|EN_GO; |
8a13b737 | 231 | es->es_oactive = 1; |
11720282 BJ |
232 | } |
233 | ||
f1b2fa5b BJ |
234 | /* |
235 | * Ethernet interface transmitter interrupt. | |
236 | * Start another output if more data to send. | |
237 | */ | |
11720282 BJ |
238 | enxint(unit) |
239 | int unit; | |
240 | { | |
b454c3ea BJ |
241 | register struct uba_device *ui = eninfo[unit]; |
242 | register struct en_softc *es = &en_softc[unit]; | |
11720282 | 243 | register struct endevice *addr; |
11720282 BJ |
244 | COUNT(ENXINT); |
245 | ||
8a13b737 BJ |
246 | if (es->es_oactive == 0) |
247 | return; | |
11720282 | 248 | addr = (struct endevice *)ui->ui_addr; |
b454c3ea | 249 | es->es_if.if_opackets++; |
8a13b737 BJ |
250 | es->es_oactive = 0; |
251 | es->es_delay = 0; | |
252 | es->es_mask = ~0; | |
89413846 BJ |
253 | if (addr->en_ostat&EN_OERROR) { |
254 | es->es_if.if_oerrors++; | |
a453e1b5 | 255 | printf("en%d: output error\n", unit); |
89413846 | 256 | } |
7a66118b BJ |
257 | if (es->es_ifuba.ifu_xtofree) { |
258 | m_freem(es->es_ifuba.ifu_xtofree); | |
259 | es->es_ifuba.ifu_xtofree = 0; | |
260 | } | |
f1b2fa5b | 261 | if (es->es_if.if_snd.ifq_head == 0) { |
8a13b737 | 262 | es->es_lastx = 0; |
11720282 BJ |
263 | return; |
264 | } | |
8a13b737 | 265 | enstart(unit); |
11720282 BJ |
266 | } |
267 | ||
f1b2fa5b BJ |
268 | /* |
269 | * Collision on ethernet interface. Do exponential | |
270 | * backoff, and retransmit. If have backed off all | |
271 | * the way printing warning diagnostic, and drop packet. | |
272 | */ | |
11720282 BJ |
273 | encollide(unit) |
274 | int unit; | |
275 | { | |
b454c3ea | 276 | register struct en_softc *es = &en_softc[unit]; |
11720282 BJ |
277 | COUNT(ENCOLLIDE); |
278 | ||
f1b2fa5b | 279 | es->es_if.if_collisions++; |
8a13b737 | 280 | if (es->es_oactive == 0) |
11720282 | 281 | return; |
b454c3ea BJ |
282 | /* |
283 | * Es_mask is a 16 bit number with n low zero bits, with | |
284 | * n the number of backoffs. When es_mask is 0 we have | |
285 | * backed off 16 times, and give up. | |
286 | */ | |
8a13b737 | 287 | if (es->es_mask == 0) { |
a453e1b5 | 288 | printf("en%d: send error\n", unit); |
8a13b737 | 289 | enxint(unit); |
b454c3ea | 290 | return; |
11720282 | 291 | } |
b454c3ea BJ |
292 | /* |
293 | * Another backoff. Restart with delay based on n low bits | |
294 | * of the interval timer. | |
295 | */ | |
296 | es->es_mask <<= 1; | |
297 | es->es_delay = mfpr(ICR) &~ es->es_mask; | |
298 | enstart(unit); | |
11720282 BJ |
299 | } |
300 | ||
541c2984 | 301 | int enprintierrors; |
31c2345c SL |
302 | struct sockaddr_pup pupsrc = { AF_PUP }; |
303 | struct sockaddr_pup pupdst = { AF_PUP }; | |
304 | struct sockproto pupproto = { PF_PUP }; | |
f1b2fa5b BJ |
305 | /* |
306 | * Ethernet interface receiver interrupt. | |
307 | * If input error just drop packet. | |
308 | * Otherwise purge input buffered data path and examine | |
309 | * packet to determine type. If can't determine length | |
310 | * from type, then have to drop packet. Othewise decapsulate | |
311 | * packet based on type and pass to type specific higher-level | |
312 | * input routine. | |
313 | */ | |
11720282 BJ |
314 | enrint(unit) |
315 | int unit; | |
316 | { | |
b454c3ea BJ |
317 | register struct en_softc *es = &en_softc[unit]; |
318 | struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; | |
319 | register struct en_header *en; | |
8a13b737 | 320 | struct mbuf *m; |
b454c3ea BJ |
321 | int len; |
322 | register struct ifqueue *inq; | |
8a13b737 | 323 | int off; |
11720282 BJ |
324 | COUNT(ENRINT); |
325 | ||
b454c3ea | 326 | es->es_if.if_ipackets++; |
f1b2fa5b BJ |
327 | |
328 | /* | |
b454c3ea | 329 | * Purge BDP; drop if input error indicated. |
f1b2fa5b BJ |
330 | */ |
331 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); | |
941ee7ef | 332 | if (addr->en_istat&EN_IERROR) { |
f1b2fa5b | 333 | es->es_if.if_ierrors++; |
541c2984 | 334 | if (enprintierrors) |
a453e1b5 | 335 | printf("en%d: input error\n", unit); |
8a13b737 | 336 | goto setup; |
11720282 | 337 | } |
f1b2fa5b BJ |
338 | |
339 | /* | |
340 | * Get pointer to ethernet header (in input buffer). | |
341 | * Deal with trailer protocol: if type is PUP trailer | |
342 | * get true type from first 16-bit word past data. | |
343 | * Remember that type was trailer by setting off. | |
344 | */ | |
345 | en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); | |
8a13b737 BJ |
346 | #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) |
347 | if (en->en_type >= ENPUP_TRAIL && | |
348 | en->en_type < ENPUP_TRAIL+ENPUP_NTRAILER) { | |
349 | off = (en->en_type - ENPUP_TRAIL) * 512; | |
b454c3ea BJ |
350 | if (off >= ENMTU) |
351 | goto setup; /* sanity */ | |
8a13b737 | 352 | en->en_type = *endataaddr(en, off, u_short *); |
8a13b737 BJ |
353 | } else |
354 | off = 0; | |
f1b2fa5b BJ |
355 | |
356 | /* | |
357 | * Attempt to infer packet length from type; | |
358 | * can't deal with packet if can't infer length. | |
359 | */ | |
8a13b737 BJ |
360 | switch (en->en_type) { |
361 | ||
362 | #ifdef INET | |
363 | case ENPUP_IPTYPE: | |
6255745d BJ |
364 | len = htons((u_short)endataaddr(en, off ? off+2 : 0, struct ip *)->ip_len); |
365 | if (off) | |
366 | len += 2; | |
11720282 BJ |
367 | break; |
368 | #endif | |
31c2345c SL |
369 | #ifdef PUP |
370 | case ENPUP_PUPTYPE: | |
371 | len = endataaddr(en, off, struct pup_header *)->pup_length; | |
372 | if (off) | |
373 | len -= 2; | |
374 | break; | |
375 | #endif | |
376 | ||
8a13b737 | 377 | default: |
5d855bdf | 378 | printf("en%d: unknown pkt type 0x%x\n", unit, en->en_type); |
8a13b737 | 379 | goto setup; |
11720282 | 380 | } |
8a13b737 BJ |
381 | if (len == 0) |
382 | goto setup; | |
f1b2fa5b BJ |
383 | |
384 | /* | |
385 | * Pull packet off interface. Off is nonzero if packet | |
386 | * has trailing header; if_rubaget will then force this header | |
387 | * information to be at the front, but we still have to drop | |
b454c3ea | 388 | * the two-byte type which is at the front of any trailer data. |
f1b2fa5b BJ |
389 | */ |
390 | m = if_rubaget(&es->es_ifuba, len, off); | |
a453e1b5 BJ |
391 | if (m == 0) |
392 | goto setup; | |
f1b2fa5b BJ |
393 | if (off) { |
394 | m->m_off += 2; | |
395 | m->m_len -= 2; | |
396 | } | |
31c2345c SL |
397 | switch (en->en_type) { |
398 | ||
399 | #ifdef INET | |
400 | case ENPUP_IPTYPE: | |
401 | setipintr(); | |
402 | inq = &ipintrq; | |
403 | break; | |
404 | #endif | |
405 | case ENPUP_PUPTYPE: { | |
406 | struct pup_header *pup = mtod(m, struct pup_header *); | |
407 | ||
408 | pupproto.sp_protocol = pup->pup_type; | |
409 | pupdst.spup_addr = pup->pup_dport; | |
410 | pupsrc.spup_addr = pup->pup_sport; | |
411 | raw_input(m, &pupproto, &pupdst, &pupsrc); | |
412 | goto setup; | |
413 | } | |
414 | } | |
8a13b737 | 415 | IF_ENQUEUE(inq, m); |
f1b2fa5b | 416 | |
ae348eea | 417 | setup: |
f1b2fa5b BJ |
418 | /* |
419 | * Reset for next packet. | |
420 | */ | |
421 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; | |
8a13b737 | 422 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; |
941ee7ef | 423 | addr->en_istat = EN_IEN|EN_GO; |
ae348eea | 424 | } |
11720282 | 425 | |
8a13b737 BJ |
426 | /* |
427 | * Ethernet output routine. | |
428 | * Encapsulate a packet of type family for the local net. | |
f1b2fa5b BJ |
429 | * Use trailer local net encapsulation if enough data in first |
430 | * packet leaves a multiple of 512 bytes of data in remainder. | |
8a13b737 BJ |
431 | */ |
432 | enoutput(ifp, m0, pf) | |
433 | struct ifnet *ifp; | |
434 | struct mbuf *m0; | |
435 | int pf; | |
11720282 | 436 | { |
8a13b737 | 437 | int type, dest; |
f1b2fa5b | 438 | register struct mbuf *m = m0; |
8a13b737 BJ |
439 | register struct en_header *en; |
440 | int s; | |
441 | ||
9d1b03e0 | 442 | COUNT(ENOUTPUT); |
8a13b737 | 443 | switch (pf) { |
11720282 | 444 | |
8a13b737 BJ |
445 | #ifdef INET |
446 | case PF_INET: { | |
447 | register struct ip *ip = mtod(m0, struct ip *); | |
448 | int off; | |
449 | ||
f7bbb8eb | 450 | #ifndef ENKLUDGE |
f1b2fa5b | 451 | dest = ip->ip_dst.s_addr >> 24; |
f7bbb8eb BJ |
452 | #else |
453 | dest = (ip->ip_dst.s_addr >> 8) & 0xff; | |
454 | #endif | |
6255745d | 455 | off = ntohs((u_short)ip->ip_len) - m->m_len; |
86532ef6 | 456 | #ifndef ENKLUDGE |
b454c3ea | 457 | if (off > 0 && (off & 0x1ff) == 0 && m->m_off >= MMINOFF + 2) { |
8a13b737 | 458 | type = ENPUP_TRAIL + (off>>9); |
f1b2fa5b BJ |
459 | m->m_off -= 2; |
460 | m->m_len += 2; | |
461 | *mtod(m, u_short *) = ENPUP_IPTYPE; | |
462 | goto gottrailertype; | |
8a13b737 | 463 | } |
86532ef6 | 464 | #endif |
f1b2fa5b BJ |
465 | type = ENPUP_IPTYPE; |
466 | off = 0; | |
467 | goto gottype; | |
8a13b737 | 468 | } |
8a13b737 | 469 | #endif |
31c2345c SL |
470 | #ifdef PUP |
471 | case PF_PUP: { | |
472 | register struct pup_header *pup = mtod(m, struct pup_header *); | |
473 | ||
474 | dest = pup->pup_dhost; | |
475 | off = pup->pup_length - m->m_len; | |
476 | if (off > 0 && (off & 0x1ff) == 0 && m->m_off >= MMINOFF + 2) { | |
477 | type = ENPUP_TRAIL + (off>>9); | |
478 | m->m_off -= 2; | |
479 | m->m_len += 2; | |
480 | *mtod(m, u_short *) = ENPUP_PUPTYPE; | |
481 | goto gottrailertype; | |
482 | } | |
483 | type = ENPUP_PUPTYPE; | |
484 | off = 0; | |
485 | goto gottype; | |
486 | } | |
487 | #endif | |
8a13b737 BJ |
488 | |
489 | default: | |
490 | printf("en%d: can't encapsulate pf%d\n", ifp->if_unit, pf); | |
491 | m_freem(m0); | |
492 | return (0); | |
493 | } | |
f1b2fa5b | 494 | |
b454c3ea | 495 | gottrailertype: |
f1b2fa5b BJ |
496 | /* |
497 | * Packet to be sent as trailer: move first packet | |
498 | * (control information) to end of chain. | |
499 | */ | |
f1b2fa5b BJ |
500 | while (m->m_next) |
501 | m = m->m_next; | |
502 | m->m_next = m0; | |
503 | m = m0->m_next; | |
504 | m0->m_next = 0; | |
b454c3ea | 505 | m0 = m; |
f1b2fa5b | 506 | |
b454c3ea | 507 | gottype: |
f1b2fa5b BJ |
508 | /* |
509 | * Add local net header. If no space in first mbuf, | |
510 | * allocate another. | |
511 | */ | |
a453e1b5 BJ |
512 | if (m->m_off > MMAXOFF || |
513 | MMINOFF + sizeof (struct en_header) > m->m_off) { | |
ef9b4258 | 514 | m = m_get(M_DONTWAIT); |
8a13b737 BJ |
515 | if (m == 0) { |
516 | m_freem(m0); | |
517 | return (0); | |
518 | } | |
519 | m->m_next = m0; | |
520 | m->m_off = MMINOFF; | |
521 | m->m_len = sizeof (struct en_header); | |
522 | } else { | |
8a13b737 BJ |
523 | m->m_off -= sizeof (struct en_header); |
524 | m->m_len += sizeof (struct en_header); | |
11720282 | 525 | } |
8a13b737 BJ |
526 | en = mtod(m, struct en_header *); |
527 | en->en_shost = ifp->if_host[0]; | |
528 | en->en_dhost = dest; | |
529 | en->en_type = type; | |
f1b2fa5b BJ |
530 | |
531 | /* | |
532 | * Queue message on interface, and start output if interface | |
533 | * not yet active. | |
534 | */ | |
8a13b737 BJ |
535 | s = splimp(); |
536 | IF_ENQUEUE(&ifp->if_snd, m); | |
8a13b737 BJ |
537 | if (en_softc[ifp->if_unit].es_oactive == 0) |
538 | enstart(ifp->if_unit); | |
89413846 | 539 | splx(s); |
f1b2fa5b | 540 | return (1); |
11720282 | 541 | } |