Commit | Line | Data |
---|---|---|
31c2345c | 1 | /* if_en.c 4.36 82/03/03 */ |
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]); | |
f1b2fa5b | 113 | es->es_if.if_init = eninit; |
b454c3ea | 114 | es->es_if.if_output = enoutput; |
f1b2fa5b | 115 | es->es_if.if_ubareset = enreset; |
7a66118b | 116 | es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16; |
405c9168 | 117 | if_attach(&es->es_if); |
11720282 BJ |
118 | } |
119 | ||
f1b2fa5b BJ |
120 | /* |
121 | * Reset of interface after UNIBUS reset. | |
122 | * If interface is on specified uba, reset its state. | |
123 | */ | |
124 | enreset(unit, uban) | |
125 | int unit, uban; | |
8a13b737 | 126 | { |
11720282 | 127 | register struct uba_device *ui; |
f1b2fa5b | 128 | COUNT(ENRESET); |
11720282 | 129 | |
b454c3ea BJ |
130 | if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 || |
131 | ui->ui_ubanum != uban) | |
f1b2fa5b | 132 | return; |
b454c3ea | 133 | printf(" en%d", unit); |
f1b2fa5b BJ |
134 | eninit(unit); |
135 | } | |
136 | ||
137 | /* | |
138 | * Initialization of interface; clear recorded pending | |
139 | * operations, and reinitialize UNIBUS usage. | |
140 | */ | |
141 | eninit(unit) | |
142 | int unit; | |
143 | { | |
b454c3ea BJ |
144 | register struct en_softc *es = &en_softc[unit]; |
145 | register struct uba_device *ui = eninfo[unit]; | |
f1b2fa5b | 146 | register struct endevice *addr; |
f1b2fa5b BJ |
147 | int s; |
148 | ||
f1b2fa5b | 149 | if (if_ubainit(&es->es_ifuba, ui->ui_ubanum, |
81950b45 | 150 | sizeof (struct en_header), (int)btoc(ENMTU)) == 0) { |
b454c3ea | 151 | printf("en%d: can't initialize\n", unit); |
8a13b737 | 152 | return; |
11720282 | 153 | } |
11720282 | 154 | addr = (struct endevice *)ui->ui_addr; |
8a13b737 | 155 | addr->en_istat = addr->en_ostat = 0; |
11720282 | 156 | |
f1b2fa5b | 157 | /* |
b454c3ea BJ |
158 | * Hang a receive and start any |
159 | * pending writes by faking a transmit complete. | |
f1b2fa5b BJ |
160 | */ |
161 | s = splimp(); | |
b454c3ea BJ |
162 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; |
163 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; | |
164 | addr->en_istat = EN_IEN|EN_GO; | |
165 | es->es_oactive = 1; | |
f1b2fa5b BJ |
166 | enxint(unit); |
167 | splx(s); | |
11720282 BJ |
168 | } |
169 | ||
3552a746 | 170 | int enlastdel = 25; |
8a13b737 | 171 | |
f1b2fa5b BJ |
172 | /* |
173 | * Start or restart output on interface. | |
174 | * If interface is already active, then this is a retransmit | |
175 | * after a collision, and just restuff registers and delay. | |
176 | * If interface is not already active, get another datagram | |
177 | * to send off of the interface queue, and map it to the interface | |
178 | * before starting the output. | |
179 | */ | |
ae348eea | 180 | enstart(dev) |
11720282 BJ |
181 | dev_t dev; |
182 | { | |
b454c3ea BJ |
183 | int unit = ENUNIT(dev); |
184 | struct uba_device *ui = eninfo[unit]; | |
185 | register struct en_softc *es = &en_softc[unit]; | |
8a13b737 | 186 | register struct endevice *addr; |
8a13b737 BJ |
187 | struct mbuf *m; |
188 | int dest; | |
ae348eea | 189 | COUNT(ENSTART); |
11720282 | 190 | |
8a13b737 BJ |
191 | if (es->es_oactive) |
192 | goto restart; | |
f1b2fa5b BJ |
193 | |
194 | /* | |
195 | * Not already active: dequeue another request | |
196 | * and map it to the UNIBUS. If no more requests, | |
197 | * just return. | |
198 | */ | |
199 | IF_DEQUEUE(&es->es_if.if_snd, m); | |
8a13b737 BJ |
200 | if (m == 0) { |
201 | es->es_oactive = 0; | |
11720282 BJ |
202 | return; |
203 | } | |
a453e1b5 | 204 | dest = mtod(m, struct en_header *)->en_dhost; |
8a13b737 | 205 | es->es_olen = if_wubaput(&es->es_ifuba, m); |
f1b2fa5b BJ |
206 | |
207 | /* | |
208 | * Ethernet cannot take back-to-back packets (no | |
209 | * buffering in interface. To avoid overrunning | |
210 | * receiver, enforce a small delay (about 1ms) in interface | |
211 | * on successive packets sent to same host. | |
212 | */ | |
8a13b737 BJ |
213 | if (es->es_lastx && es->es_lastx == dest) |
214 | es->es_delay = enlastdel; | |
215 | else | |
216 | es->es_lastx = dest; | |
f1b2fa5b | 217 | |
8a13b737 | 218 | restart: |
f1b2fa5b BJ |
219 | /* |
220 | * Have request mapped to UNIBUS for transmission. | |
221 | * Purge any stale data from this BDP, and start the otput. | |
222 | */ | |
223 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp); | |
11720282 | 224 | addr = (struct endevice *)ui->ui_addr; |
405c9168 | 225 | addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info; |
8a13b737 BJ |
226 | addr->en_odelay = es->es_delay; |
227 | addr->en_owc = -((es->es_olen + 1) >> 1); | |
941ee7ef | 228 | addr->en_ostat = EN_IEN|EN_GO; |
8a13b737 | 229 | es->es_oactive = 1; |
11720282 BJ |
230 | } |
231 | ||
f1b2fa5b BJ |
232 | /* |
233 | * Ethernet interface transmitter interrupt. | |
234 | * Start another output if more data to send. | |
235 | */ | |
11720282 BJ |
236 | enxint(unit) |
237 | int unit; | |
238 | { | |
b454c3ea BJ |
239 | register struct uba_device *ui = eninfo[unit]; |
240 | register struct en_softc *es = &en_softc[unit]; | |
11720282 | 241 | register struct endevice *addr; |
11720282 BJ |
242 | COUNT(ENXINT); |
243 | ||
8a13b737 BJ |
244 | if (es->es_oactive == 0) |
245 | return; | |
11720282 | 246 | addr = (struct endevice *)ui->ui_addr; |
b454c3ea | 247 | es->es_if.if_opackets++; |
8a13b737 BJ |
248 | es->es_oactive = 0; |
249 | es->es_delay = 0; | |
250 | es->es_mask = ~0; | |
89413846 BJ |
251 | if (addr->en_ostat&EN_OERROR) { |
252 | es->es_if.if_oerrors++; | |
a453e1b5 | 253 | printf("en%d: output error\n", unit); |
89413846 | 254 | } |
7a66118b BJ |
255 | if (es->es_ifuba.ifu_xtofree) { |
256 | m_freem(es->es_ifuba.ifu_xtofree); | |
257 | es->es_ifuba.ifu_xtofree = 0; | |
258 | } | |
f1b2fa5b | 259 | if (es->es_if.if_snd.ifq_head == 0) { |
8a13b737 | 260 | es->es_lastx = 0; |
11720282 BJ |
261 | return; |
262 | } | |
8a13b737 | 263 | enstart(unit); |
11720282 BJ |
264 | } |
265 | ||
f1b2fa5b BJ |
266 | /* |
267 | * Collision on ethernet interface. Do exponential | |
268 | * backoff, and retransmit. If have backed off all | |
269 | * the way printing warning diagnostic, and drop packet. | |
270 | */ | |
11720282 BJ |
271 | encollide(unit) |
272 | int unit; | |
273 | { | |
b454c3ea | 274 | register struct en_softc *es = &en_softc[unit]; |
11720282 BJ |
275 | COUNT(ENCOLLIDE); |
276 | ||
f1b2fa5b | 277 | es->es_if.if_collisions++; |
8a13b737 | 278 | if (es->es_oactive == 0) |
11720282 | 279 | return; |
b454c3ea BJ |
280 | /* |
281 | * Es_mask is a 16 bit number with n low zero bits, with | |
282 | * n the number of backoffs. When es_mask is 0 we have | |
283 | * backed off 16 times, and give up. | |
284 | */ | |
8a13b737 | 285 | if (es->es_mask == 0) { |
a453e1b5 | 286 | printf("en%d: send error\n", unit); |
8a13b737 | 287 | enxint(unit); |
b454c3ea | 288 | return; |
11720282 | 289 | } |
b454c3ea BJ |
290 | /* |
291 | * Another backoff. Restart with delay based on n low bits | |
292 | * of the interval timer. | |
293 | */ | |
294 | es->es_mask <<= 1; | |
295 | es->es_delay = mfpr(ICR) &~ es->es_mask; | |
296 | enstart(unit); | |
11720282 BJ |
297 | } |
298 | ||
541c2984 | 299 | int enprintierrors; |
31c2345c SL |
300 | struct sockaddr_pup pupsrc = { AF_PUP }; |
301 | struct sockaddr_pup pupdst = { AF_PUP }; | |
302 | struct sockproto pupproto = { PF_PUP }; | |
f1b2fa5b BJ |
303 | /* |
304 | * Ethernet interface receiver interrupt. | |
305 | * If input error just drop packet. | |
306 | * Otherwise purge input buffered data path and examine | |
307 | * packet to determine type. If can't determine length | |
308 | * from type, then have to drop packet. Othewise decapsulate | |
309 | * packet based on type and pass to type specific higher-level | |
310 | * input routine. | |
311 | */ | |
11720282 BJ |
312 | enrint(unit) |
313 | int unit; | |
314 | { | |
b454c3ea BJ |
315 | register struct en_softc *es = &en_softc[unit]; |
316 | struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr; | |
317 | register struct en_header *en; | |
8a13b737 | 318 | struct mbuf *m; |
b454c3ea BJ |
319 | int len; |
320 | register struct ifqueue *inq; | |
8a13b737 | 321 | int off; |
11720282 BJ |
322 | COUNT(ENRINT); |
323 | ||
b454c3ea | 324 | es->es_if.if_ipackets++; |
f1b2fa5b BJ |
325 | |
326 | /* | |
b454c3ea | 327 | * Purge BDP; drop if input error indicated. |
f1b2fa5b BJ |
328 | */ |
329 | UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp); | |
941ee7ef | 330 | if (addr->en_istat&EN_IERROR) { |
f1b2fa5b | 331 | es->es_if.if_ierrors++; |
541c2984 | 332 | if (enprintierrors) |
a453e1b5 | 333 | printf("en%d: input error\n", unit); |
8a13b737 | 334 | goto setup; |
11720282 | 335 | } |
f1b2fa5b BJ |
336 | |
337 | /* | |
338 | * Get pointer to ethernet header (in input buffer). | |
339 | * Deal with trailer protocol: if type is PUP trailer | |
340 | * get true type from first 16-bit word past data. | |
341 | * Remember that type was trailer by setting off. | |
342 | */ | |
343 | en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr); | |
8a13b737 BJ |
344 | #define endataaddr(en, off, type) ((type)(((caddr_t)((en)+1)+(off)))) |
345 | if (en->en_type >= ENPUP_TRAIL && | |
346 | en->en_type < ENPUP_TRAIL+ENPUP_NTRAILER) { | |
347 | off = (en->en_type - ENPUP_TRAIL) * 512; | |
b454c3ea BJ |
348 | if (off >= ENMTU) |
349 | goto setup; /* sanity */ | |
8a13b737 | 350 | en->en_type = *endataaddr(en, off, u_short *); |
8a13b737 BJ |
351 | } else |
352 | off = 0; | |
f1b2fa5b BJ |
353 | |
354 | /* | |
355 | * Attempt to infer packet length from type; | |
356 | * can't deal with packet if can't infer length. | |
357 | */ | |
8a13b737 BJ |
358 | switch (en->en_type) { |
359 | ||
360 | #ifdef INET | |
361 | case ENPUP_IPTYPE: | |
6255745d BJ |
362 | len = htons((u_short)endataaddr(en, off ? off+2 : 0, struct ip *)->ip_len); |
363 | if (off) | |
364 | len += 2; | |
11720282 BJ |
365 | break; |
366 | #endif | |
31c2345c SL |
367 | #ifdef PUP |
368 | case ENPUP_PUPTYPE: | |
369 | len = endataaddr(en, off, struct pup_header *)->pup_length; | |
370 | if (off) | |
371 | len -= 2; | |
372 | break; | |
373 | #endif | |
374 | ||
8a13b737 | 375 | default: |
5d855bdf | 376 | printf("en%d: unknown pkt type 0x%x\n", unit, en->en_type); |
8a13b737 | 377 | goto setup; |
11720282 | 378 | } |
8a13b737 BJ |
379 | if (len == 0) |
380 | goto setup; | |
f1b2fa5b BJ |
381 | |
382 | /* | |
383 | * Pull packet off interface. Off is nonzero if packet | |
384 | * has trailing header; if_rubaget will then force this header | |
385 | * information to be at the front, but we still have to drop | |
b454c3ea | 386 | * the two-byte type which is at the front of any trailer data. |
f1b2fa5b BJ |
387 | */ |
388 | m = if_rubaget(&es->es_ifuba, len, off); | |
a453e1b5 BJ |
389 | if (m == 0) |
390 | goto setup; | |
f1b2fa5b BJ |
391 | if (off) { |
392 | m->m_off += 2; | |
393 | m->m_len -= 2; | |
394 | } | |
31c2345c SL |
395 | switch (en->en_type) { |
396 | ||
397 | #ifdef INET | |
398 | case ENPUP_IPTYPE: | |
399 | setipintr(); | |
400 | inq = &ipintrq; | |
401 | break; | |
402 | #endif | |
403 | case ENPUP_PUPTYPE: { | |
404 | struct pup_header *pup = mtod(m, struct pup_header *); | |
405 | ||
406 | pupproto.sp_protocol = pup->pup_type; | |
407 | pupdst.spup_addr = pup->pup_dport; | |
408 | pupsrc.spup_addr = pup->pup_sport; | |
409 | raw_input(m, &pupproto, &pupdst, &pupsrc); | |
410 | goto setup; | |
411 | } | |
412 | } | |
8a13b737 | 413 | IF_ENQUEUE(inq, m); |
f1b2fa5b | 414 | |
ae348eea | 415 | setup: |
f1b2fa5b BJ |
416 | /* |
417 | * Reset for next packet. | |
418 | */ | |
419 | addr->en_iba = es->es_ifuba.ifu_r.ifrw_info; | |
8a13b737 | 420 | addr->en_iwc = -(sizeof (struct en_header) + ENMTU) >> 1; |
941ee7ef | 421 | addr->en_istat = EN_IEN|EN_GO; |
ae348eea | 422 | } |
11720282 | 423 | |
8a13b737 BJ |
424 | /* |
425 | * Ethernet output routine. | |
426 | * Encapsulate a packet of type family for the local net. | |
f1b2fa5b BJ |
427 | * Use trailer local net encapsulation if enough data in first |
428 | * packet leaves a multiple of 512 bytes of data in remainder. | |
8a13b737 BJ |
429 | */ |
430 | enoutput(ifp, m0, pf) | |
431 | struct ifnet *ifp; | |
432 | struct mbuf *m0; | |
433 | int pf; | |
11720282 | 434 | { |
8a13b737 | 435 | int type, dest; |
f1b2fa5b | 436 | register struct mbuf *m = m0; |
8a13b737 BJ |
437 | register struct en_header *en; |
438 | int s; | |
439 | ||
9d1b03e0 | 440 | COUNT(ENOUTPUT); |
8a13b737 | 441 | switch (pf) { |
11720282 | 442 | |
8a13b737 BJ |
443 | #ifdef INET |
444 | case PF_INET: { | |
445 | register struct ip *ip = mtod(m0, struct ip *); | |
446 | int off; | |
447 | ||
f7bbb8eb | 448 | #ifndef ENKLUDGE |
f1b2fa5b | 449 | dest = ip->ip_dst.s_addr >> 24; |
f7bbb8eb BJ |
450 | #else |
451 | dest = (ip->ip_dst.s_addr >> 8) & 0xff; | |
452 | #endif | |
6255745d | 453 | off = ntohs((u_short)ip->ip_len) - m->m_len; |
86532ef6 | 454 | #ifndef ENKLUDGE |
b454c3ea | 455 | if (off > 0 && (off & 0x1ff) == 0 && m->m_off >= MMINOFF + 2) { |
8a13b737 | 456 | type = ENPUP_TRAIL + (off>>9); |
f1b2fa5b BJ |
457 | m->m_off -= 2; |
458 | m->m_len += 2; | |
459 | *mtod(m, u_short *) = ENPUP_IPTYPE; | |
460 | goto gottrailertype; | |
8a13b737 | 461 | } |
86532ef6 | 462 | #endif |
f1b2fa5b BJ |
463 | type = ENPUP_IPTYPE; |
464 | off = 0; | |
465 | goto gottype; | |
8a13b737 | 466 | } |
8a13b737 | 467 | #endif |
31c2345c SL |
468 | #ifdef PUP |
469 | case PF_PUP: { | |
470 | register struct pup_header *pup = mtod(m, struct pup_header *); | |
471 | ||
472 | dest = pup->pup_dhost; | |
473 | off = pup->pup_length - m->m_len; | |
474 | if (off > 0 && (off & 0x1ff) == 0 && m->m_off >= MMINOFF + 2) { | |
475 | type = ENPUP_TRAIL + (off>>9); | |
476 | m->m_off -= 2; | |
477 | m->m_len += 2; | |
478 | *mtod(m, u_short *) = ENPUP_PUPTYPE; | |
479 | goto gottrailertype; | |
480 | } | |
481 | type = ENPUP_PUPTYPE; | |
482 | off = 0; | |
483 | goto gottype; | |
484 | } | |
485 | #endif | |
8a13b737 BJ |
486 | |
487 | default: | |
488 | printf("en%d: can't encapsulate pf%d\n", ifp->if_unit, pf); | |
489 | m_freem(m0); | |
490 | return (0); | |
491 | } | |
f1b2fa5b | 492 | |
b454c3ea | 493 | gottrailertype: |
f1b2fa5b BJ |
494 | /* |
495 | * Packet to be sent as trailer: move first packet | |
496 | * (control information) to end of chain. | |
497 | */ | |
f1b2fa5b BJ |
498 | while (m->m_next) |
499 | m = m->m_next; | |
500 | m->m_next = m0; | |
501 | m = m0->m_next; | |
502 | m0->m_next = 0; | |
b454c3ea | 503 | m0 = m; |
f1b2fa5b | 504 | |
b454c3ea | 505 | gottype: |
f1b2fa5b BJ |
506 | /* |
507 | * Add local net header. If no space in first mbuf, | |
508 | * allocate another. | |
509 | */ | |
a453e1b5 BJ |
510 | if (m->m_off > MMAXOFF || |
511 | MMINOFF + sizeof (struct en_header) > m->m_off) { | |
ef9b4258 | 512 | m = m_get(M_DONTWAIT); |
8a13b737 BJ |
513 | if (m == 0) { |
514 | m_freem(m0); | |
515 | return (0); | |
516 | } | |
517 | m->m_next = m0; | |
518 | m->m_off = MMINOFF; | |
519 | m->m_len = sizeof (struct en_header); | |
520 | } else { | |
8a13b737 BJ |
521 | m->m_off -= sizeof (struct en_header); |
522 | m->m_len += sizeof (struct en_header); | |
11720282 | 523 | } |
8a13b737 BJ |
524 | en = mtod(m, struct en_header *); |
525 | en->en_shost = ifp->if_host[0]; | |
526 | en->en_dhost = dest; | |
527 | en->en_type = type; | |
f1b2fa5b BJ |
528 | |
529 | /* | |
530 | * Queue message on interface, and start output if interface | |
531 | * not yet active. | |
532 | */ | |
8a13b737 BJ |
533 | s = splimp(); |
534 | IF_ENQUEUE(&ifp->if_snd, m); | |
8a13b737 BJ |
535 | if (en_softc[ifp->if_unit].es_oactive == 0) |
536 | enstart(ifp->if_unit); | |
89413846 | 537 | splx(s); |
f1b2fa5b | 538 | return (1); |
11720282 | 539 | } |