1 |
/* |
2 |
* Cisco C7200 (Predator) DEC21140 Module. |
3 |
* Copyright (C) 2005,2006 Christophe Fillot. All rights reserved. |
4 |
* |
5 |
* DEC21140 FastEthernet chip emulation. |
6 |
* |
7 |
* It allows to emulate a C7200-IO-FE card with 1 port and PA-FE-TX cards. |
8 |
* |
9 |
* Many many thanks to mtve (aka "Mtv Europe") for his great work on |
10 |
* this stuff. |
11 |
* |
12 |
* Manuals: |
13 |
* |
14 |
* DECchip 21140 PCI fast Ethernet LAN controller Hardware reference manual |
15 |
* http://ftp.nluug.nl/NetBSD/misc/dec-docs/ec-qc0cb-te.ps.gz |
16 |
* |
17 |
* National DP83840 PHY |
18 |
* http://www.rezrov.net/docs/DP83840A.pdf |
19 |
* |
20 |
* Remark: only Big-endian mode is supported. |
21 |
*/ |
22 |
|
23 |
#include <stdio.h> |
24 |
#include <stdlib.h> |
25 |
#include <string.h> |
26 |
#include <stdarg.h> |
27 |
#include <unistd.h> |
28 |
#include <time.h> |
29 |
#include <errno.h> |
30 |
#include <assert.h> |
31 |
|
32 |
#include "crc.h" |
33 |
#include "utils.h" |
34 |
#include "mips64.h" |
35 |
#include "dynamips.h" |
36 |
#include "memory.h" |
37 |
#include "device.h" |
38 |
#include "net.h" |
39 |
#include "net_io.h" |
40 |
#include "ptask.h" |
41 |
#include "dev_dec21140.h" |
42 |
|
43 |
/* Debugging flags */ |
44 |
#define DEBUG_MII_REGS 0 |
45 |
#define DEBUG_CSR_REGS 0 |
46 |
#define DEBUG_PCI_REGS 0 |
47 |
#define DEBUG_TRANSMIT 0 |
48 |
#define DEBUG_RECEIVE 0 |
49 |
|
50 |
/* DEC21140 PCI vendor/product codes */ |
51 |
#define DEC21140_PCI_VENDOR_ID 0x1011 |
52 |
#define DEC21140_PCI_PRODUCT_ID 0x0009 |
53 |
|
54 |
/* DEC21140 PCI registers */ |
55 |
#define DEC21140_PCI_CFID_REG_OFFSET 0x00 |
56 |
#define DEC21140_PCI_CFCS_REG_OFFSET 0x04 |
57 |
#define DEC21140_PCI_CFRV_REG_OFFSET 0x08 |
58 |
#define DEC21140_PCI_CFLT_REG_OFFSET 0x0C |
59 |
#define DEC21140_PCI_CBIO_REG_OFFSET 0x10 |
60 |
#define DEC21140_PCI_CBMA_REG_OFFSET 0x14 |
61 |
#define DEC21140_PCI_CFIT_REG_OFFSET 0x3C |
62 |
#define DEC21140_PCI_CFDA_REG_OFFSET 0x40 |
63 |
|
64 |
/* Number of CSR registers */ |
65 |
#define DEC21140_CSR_NR 16 |
66 |
|
67 |
/* CSR5: Status Register */ |
68 |
#define DEC21140_CSR5_TI 0x00000001 |
69 |
#define DEC21140_CSR5_RI 0x00000040 |
70 |
#define DEC21140_CSR5_RS_SHIFT 17 |
71 |
#define DEC21140_CSR5_TS_SHIFT 20 |
72 |
|
73 |
/* CSR6: Operating Mode Register */ |
74 |
#define DEC21140_CSR6_START_RX 0x00000002 |
75 |
#define DEC21140_CSR6_START_TX 0x00002000 |
76 |
#define DEC21140_CSR6_PROMISC 0x00000040 |
77 |
|
78 |
/* CSR9: Serial EEPROM and MII */ |
79 |
#define DEC21140_CSR9_RX_BIT 0x00080000 |
80 |
#define DEC21140_CSR9_MII_READ 0x00040000 |
81 |
#define DEC21140_CSR9_TX_BIT 0x00020000 |
82 |
#define DEC21140_CSR9_MDC_CLOCK 0x00010000 |
83 |
#define DEC21140_CSR9_READ 0x00004000 |
84 |
#define DEC21140_CSR9_WRITE 0x00002000 |
85 |
|
86 |
/* Maximum packet size */ |
87 |
#define DEC21140_MAX_PKT_SIZE 2048 |
88 |
|
89 |
/* Send up to 32 packets in a TX ring scan pass */ |
90 |
#define DEC21140_TXRING_PASS_COUNT 32 |
91 |
|
92 |
/* Setup frame size */ |
93 |
#define DEC21140_SETUP_FRAME_SIZE 192 |
94 |
|
95 |
/* RX descriptors */ |
96 |
#define DEC21140_RXDESC_OWN 0x80000000 /* Ownership */ |
97 |
#define DEC21140_RXDESC_LS 0x00000100 /* Last Segment */ |
98 |
#define DEC21140_RXDESC_FS 0x00000200 /* First Segment */ |
99 |
#define DEC21140_RXDESC_MF 0x00000400 /* Multicast Frame */ |
100 |
#define DEC21140_RXDESC_DE 0x00004000 /* Descriptor Error */ |
101 |
#define DEC21140_RXDESC_RCH 0x01000000 /* Sec. Addr. Chained */ |
102 |
#define DEC21140_RXDESC_RER 0x02000000 /* Receive End of Ring */ |
103 |
#define DEC21140_RXDESC_FL_SHIFT 16 |
104 |
#define DEC21140_RXDESC_LEN_MASK 0x7ff |
105 |
|
106 |
/* TX descriptors */ |
107 |
#define DEC21140_TXDESC_OWN 0x80000000 /* Ownership */ |
108 |
#define DEC21140_TXDESC_TCH 0x01000000 /* Sec. Addr. Chained */ |
109 |
#define DEC21140_TXDESC_TER 0x02000000 /* Transmit End of Ring */ |
110 |
#define DEC21140_TXDESC_SET 0x08000000 /* Setup frame */ |
111 |
#define DEC21140_TXDESC_FS 0x20000000 /* First Segment */ |
112 |
#define DEC21140_TXDESC_LS 0x40000000 /* Last Segment */ |
113 |
#define DEC21140_TXDESC_IC 0x80000000 /* IRQ on completion */ |
114 |
|
115 |
#define DEC21140_TXDESC_LEN_MASK 0x7ff |
116 |
|
117 |
/* RX Descriptor */ |
118 |
struct rx_desc { |
119 |
m_uint32_t rdes[4]; |
120 |
}; |
121 |
|
122 |
/* TX Descriptor */ |
123 |
struct tx_desc { |
124 |
m_uint32_t tdes[4]; |
125 |
}; |
126 |
|
127 |
/* DEC21140 Data */ |
128 |
struct dec21140_data { |
129 |
char *name; |
130 |
|
131 |
/* Physical addresses of current RX and TX descriptors */ |
132 |
m_uint32_t rx_current; |
133 |
m_uint32_t tx_current; |
134 |
|
135 |
/* CSR registers */ |
136 |
m_uint32_t csr[DEC21140_CSR_NR]; |
137 |
|
138 |
/* MII registers */ |
139 |
m_uint32_t mii_state; |
140 |
m_uint32_t mii_phy; |
141 |
m_uint32_t mii_reg; |
142 |
m_uint32_t mii_data; |
143 |
m_uint32_t mii_outbits; |
144 |
m_uint16_t mii_regs[32][32]; |
145 |
|
146 |
/* Ethernet unicast addresses */ |
147 |
n_eth_addr_t mac_addr[16]; |
148 |
u_int mac_addr_count; |
149 |
|
150 |
/* Device information */ |
151 |
struct vdevice *dev; |
152 |
|
153 |
/* PCI device information */ |
154 |
struct pci_device *pci_dev; |
155 |
|
156 |
/* Virtual machine */ |
157 |
vm_instance_t *vm; |
158 |
|
159 |
/* NetIO descriptor */ |
160 |
netio_desc_t *nio; |
161 |
|
162 |
/* TX ring scanner task id */ |
163 |
ptask_id_t tx_tid; |
164 |
}; |
165 |
|
166 |
/* Log a dec21140 message */ |
167 |
#define DEC21140_LOG(d,msg...) vm_log((d)->vm,(d)->name,msg) |
168 |
|
169 |
/* |
170 |
* ISL rewrite. |
171 |
* |
172 |
* See: http://www.cisco.com/en/US/tech/tk389/tk390/technologies_tech_note09186a0080094665.shtml |
173 |
*/ |
174 |
static void dec21140_isl_rewrite(m_uint8_t *pkt,m_uint32_t tot_len) |
175 |
{ |
176 |
static m_uint8_t isl_xaddr[N_ETH_ALEN] = { 0x01,0x00,0x0c,0x00,0x10,0x00 }; |
177 |
u_int real_offset,real_len; |
178 |
n_eth_hdr_t *hdr; |
179 |
m_uint32_t ifcs; |
180 |
|
181 |
hdr = (n_eth_hdr_t *)pkt; |
182 |
if (!memcmp(&hdr->daddr,isl_xaddr,N_ETH_ALEN)) { |
183 |
real_offset = N_ETH_HLEN + N_ISL_HDR_SIZE; |
184 |
real_len = ntohs(hdr->type); |
185 |
real_len -= (N_ISL_HDR_SIZE + 4); |
186 |
|
187 |
if ((real_offset+real_len) > tot_len) |
188 |
return; |
189 |
|
190 |
/* Rewrite the destination MAC address */ |
191 |
hdr->daddr.eth_addr_byte[4] = 0x00; |
192 |
|
193 |
/* Compute the internal FCS on the encapsulated packet */ |
194 |
ifcs = crc32_compute(0xFFFFFFFF,pkt+real_offset,real_len); |
195 |
pkt[tot_len-4] = ifcs & 0xff; |
196 |
pkt[tot_len-3] = (ifcs >> 8) & 0xff; |
197 |
pkt[tot_len-2] = (ifcs >> 16) & 0xff; |
198 |
pkt[tot_len-1] = ifcs >> 24; |
199 |
} |
200 |
} |
201 |
|
202 |
/* Check if a packet must be delivered to the emulated chip */ |
203 |
static inline int dec21140_handle_mac_addr(struct dec21140_data *d, |
204 |
m_uint8_t *pkt) |
205 |
{ |
206 |
n_eth_hdr_t *hdr = (n_eth_hdr_t *)pkt; |
207 |
int i; |
208 |
|
209 |
/* Ignore traffic sent by us */ |
210 |
for(i=0;i<d->mac_addr_count;i++) |
211 |
if (!memcmp(&d->mac_addr[i],&hdr->saddr,N_ETH_ALEN)) |
212 |
return(FALSE); |
213 |
|
214 |
/* Accept systematically frames if we are running is promiscuous mode */ |
215 |
if (d->csr[6] & DEC21140_CSR6_PROMISC) |
216 |
return(TRUE); |
217 |
|
218 |
/* Accept systematically all multicast frames */ |
219 |
if (eth_addr_is_mcast(&hdr->daddr)) |
220 |
return(TRUE); |
221 |
|
222 |
/* Accept frames directly for us, discard others */ |
223 |
for(i=0;i<d->mac_addr_count;i++) |
224 |
if (!memcmp(&d->mac_addr[i],&hdr->daddr,N_ETH_ALEN)) |
225 |
return(TRUE); |
226 |
|
227 |
return(FALSE); |
228 |
} |
229 |
|
230 |
/* Update MAC addresses */ |
231 |
static void dec21140_update_mac_addr(struct dec21140_data *d, |
232 |
u_char *setup_frame) |
233 |
{ |
234 |
n_eth_addr_t addr; |
235 |
int i,nb_addr,addr_size; |
236 |
|
237 |
d->mac_addr_count = 0; |
238 |
|
239 |
addr_size = N_ETH_ALEN * 2; |
240 |
nb_addr = DEC21140_SETUP_FRAME_SIZE / addr_size; |
241 |
|
242 |
for(i=0;i<nb_addr;i++) { |
243 |
addr.eth_addr_byte[0] = setup_frame[(i * addr_size) + 0]; |
244 |
addr.eth_addr_byte[1] = setup_frame[(i * addr_size) + 1]; |
245 |
addr.eth_addr_byte[2] = setup_frame[(i * addr_size) + 4]; |
246 |
addr.eth_addr_byte[3] = setup_frame[(i * addr_size) + 5]; |
247 |
addr.eth_addr_byte[4] = setup_frame[(i * addr_size) + 8]; |
248 |
addr.eth_addr_byte[5] = setup_frame[(i * addr_size) + 9]; |
249 |
|
250 |
if (!eth_addr_is_mcast(&addr)) { |
251 |
memcpy(&d->mac_addr[d->mac_addr_count],&addr,N_ETH_ALEN); |
252 |
DEC21140_LOG(d,"unicast MAC address: " |
253 |
"%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n", |
254 |
addr.eth_addr_byte[0],addr.eth_addr_byte[1], |
255 |
addr.eth_addr_byte[2],addr.eth_addr_byte[3], |
256 |
addr.eth_addr_byte[4],addr.eth_addr_byte[5]); |
257 |
d->mac_addr_count++; |
258 |
} |
259 |
} |
260 |
} |
261 |
|
262 |
/* Get a PCI register name */ |
263 |
static char *pci_cfgreg_name(int reg) |
264 |
{ |
265 |
static char *name[] = { |
266 |
"FID", "FCS", "FRV", "FLT", "BIO", "BMA", "?", "?", |
267 |
"?", "?", "?", "?", "?", "?", "?", "FIT", "FDA" |
268 |
}; |
269 |
|
270 |
return((reg>=0) && (reg<=DEC21140_CSR_NR*4) && ((reg&3)==0) ? |
271 |
name[reg>>2] : "?"); |
272 |
} |
273 |
|
274 |
/* |
275 |
* read from register of DP83840A PHY |
276 |
*/ |
277 |
static m_uint16_t mii_reg_read(struct dec21140_data *d) |
278 |
{ |
279 |
#if DEBUG_MII_REGS |
280 |
DEC21140_LOG(d,"MII PHY read %d reg %d\n",d->mii_phy,d->mii_reg); |
281 |
#endif |
282 |
|
283 |
/* |
284 |
* if it's BASIC MODE STATUS REGISTER (BMSR) at address 0x1 |
285 |
* then tell them that "Link Status" is up and no troubles. |
286 |
*/ |
287 |
if (d->mii_reg == 1) { |
288 |
if (d->nio != NULL) |
289 |
return(0x04); |
290 |
else |
291 |
return(0x00); |
292 |
} |
293 |
|
294 |
return(d->mii_regs[d->mii_phy][d->mii_reg]); |
295 |
} |
296 |
|
297 |
/* |
298 |
* write to register of DP83840A PHY |
299 |
*/ |
300 |
static void mii_reg_write(struct dec21140_data *d) |
301 |
{ |
302 |
#if DEBUG_MII_REGS |
303 |
DEC21140_LOG(d,"MII PHY write %d reg %d value %04x\n", |
304 |
d->mii_phy,d->mii_reg,d->mii_data); |
305 |
#endif |
306 |
assert(d->mii_phy < 32); |
307 |
assert(d->mii_reg < 32); |
308 |
d->mii_regs[d->mii_phy][d->mii_reg] = d->mii_data; |
309 |
} |
310 |
|
311 |
/* |
312 |
* process new bit sent by IOS to PHY. |
313 |
*/ |
314 |
static void mii_newbit(struct dec21140_data *d,int newbit) |
315 |
{ |
316 |
#if DEBUG_MII_REGS |
317 |
DEC21140_LOG(d,"MII state was %d\n",d->mii_state); |
318 |
#endif |
319 |
|
320 |
switch (d->mii_state) { |
321 |
case 0: /* init */ |
322 |
d->mii_state = newbit ? 0 : 1; |
323 |
d->mii_phy = 0; |
324 |
d->mii_reg = 0; |
325 |
d->mii_data = 0; |
326 |
break; |
327 |
|
328 |
case 1: /* already got 0 */ |
329 |
d->mii_state = newbit ? 2 : 0; |
330 |
break; |
331 |
|
332 |
case 2: /* already got attention */ |
333 |
d->mii_state = newbit ? 3 : 4; |
334 |
break; |
335 |
|
336 |
case 3: /* probably it's read */ |
337 |
d->mii_state = newbit ? 0 : 10; |
338 |
break; |
339 |
|
340 |
case 4: /* probably it's write */ |
341 |
d->mii_state = newbit ? 20 : 0; |
342 |
break; |
343 |
|
344 |
case 10: case 11: case 12: case 13: case 14: |
345 |
case 20: case 21: case 22: case 23: case 24: |
346 |
/* read or write state, read 5 bits of phy */ |
347 |
d->mii_phy <<= 1; |
348 |
d->mii_phy |= newbit; |
349 |
d->mii_state++; |
350 |
break; |
351 |
|
352 |
case 15: case 16: case 17: case 18: case 19: |
353 |
case 25: case 26: case 27: case 28: case 29: |
354 |
/* read or write state, read 5 bits of reg */ |
355 |
d->mii_reg <<= 1; |
356 |
d->mii_reg |= newbit; |
357 |
d->mii_state++; |
358 |
|
359 |
if (d->mii_state == 20) { |
360 |
/* read state, got everything */ |
361 |
d->mii_outbits = mii_reg_read (d) << 15; /* first bit will |
362 |
* be thrown away! |
363 |
*/ |
364 |
d->mii_state = 0; |
365 |
} |
366 |
|
367 |
break; |
368 |
|
369 |
case 30: /* write state, read first waiting bit */ |
370 |
d->mii_state = newbit ? 31 : 0; |
371 |
break; |
372 |
|
373 |
case 31: /* write state, read second waiting bit */ |
374 |
d->mii_state = newbit ? 0 : 32; |
375 |
break; |
376 |
|
377 |
case 32: case 33: case 34: case 35: case 36: case 37: case 38: case 39: |
378 |
case 40: case 41: case 42: case 43: case 44: case 45: case 46: case 47: |
379 |
/* write state, read 16 bits of data */ |
380 |
d->mii_data <<= 1; |
381 |
d->mii_data |= newbit; |
382 |
d->mii_state++; |
383 |
|
384 |
if (d->mii_state == 48) { |
385 |
/* write state, got everything */ |
386 |
mii_reg_write (d); |
387 |
d->mii_state = 0; |
388 |
} |
389 |
|
390 |
break; |
391 |
default: |
392 |
DEC21140_LOG(d,"MII impossible state\n"); |
393 |
} |
394 |
|
395 |
#if DEBUG_MII_REGS |
396 |
DEC21140_LOG(d,"MII state now %d\n",d->mii_state); |
397 |
#endif |
398 |
} |
399 |
|
400 |
/* |
401 |
* dev_dec21140_access() |
402 |
*/ |
403 |
void *dev_dec21140_access(cpu_mips_t *cpu,struct vdevice *dev, |
404 |
m_uint32_t offset,u_int op_size,u_int op_type, |
405 |
m_uint64_t *data) |
406 |
{ |
407 |
struct dec21140_data *d = dev->priv_data; |
408 |
u_int reg; |
409 |
|
410 |
/* which CSR register ? */ |
411 |
reg = offset / 8; |
412 |
|
413 |
if ((reg >= DEC21140_CSR_NR) || (offset % 8) != 0) { |
414 |
cpu_log(cpu,d->name,"invalid access to offset 0x%x\n",offset); |
415 |
return NULL; |
416 |
} |
417 |
|
418 |
if (op_type == MTS_READ) { |
419 |
#if DEBUG_CSR_REGS |
420 |
cpu_log(cpu,d->name,"read CSR%u value 0x%x\n",reg,d->csr[reg]); |
421 |
#endif |
422 |
switch(reg) { |
423 |
case 5: |
424 |
/* Dynamically construct CSR5 */ |
425 |
*data = 0; |
426 |
|
427 |
if (d->csr[6] & DEC21140_CSR6_START_RX) |
428 |
*data |= 0x03 << DEC21140_CSR5_RS_SHIFT; |
429 |
|
430 |
if (d->csr[6] & DEC21140_CSR6_START_TX) |
431 |
*data |= 0x03 << DEC21140_CSR5_TS_SHIFT; |
432 |
|
433 |
*data |= d->csr[5] & (DEC21140_CSR5_TI|DEC21140_CSR5_RI); |
434 |
break; |
435 |
|
436 |
case 8: |
437 |
/* CSR8 is cleared when read */ |
438 |
d->csr[reg] = 0; |
439 |
break; |
440 |
|
441 |
default: |
442 |
*data = d->csr[reg]; |
443 |
} |
444 |
} else { |
445 |
#if DEBUG_CSR_REGS |
446 |
cpu_log(cpu,d->name,"write CSR%u value 0x%x\n",reg,(m_uint32_t)*data); |
447 |
#endif |
448 |
d->csr[reg] = *data; |
449 |
|
450 |
switch(reg) { |
451 |
case 3: |
452 |
d->rx_current = d->csr[reg]; |
453 |
break; |
454 |
case 4: |
455 |
d->tx_current = d->csr[reg]; |
456 |
break; |
457 |
case 9: |
458 |
/* |
459 |
* CSR9, probably they want to mess with MII PHY |
460 |
* The protocol to PHY is like serial over one bit. |
461 |
* We will ignore clock 0 of read or write. |
462 |
* |
463 |
* This whole code is needed only to tell IOS that "Link Status" |
464 |
* bit in BMSR register of DP83840A PHY is set. |
465 |
* |
466 |
* Also it makes "sh contr f0/0" happy. |
467 |
*/ |
468 |
if ((*data&~DEC21140_CSR9_TX_BIT) == (DEC21140_CSR9_MII_READ| |
469 |
DEC21140_CSR9_READ|DEC21140_CSR9_MDC_CLOCK)) { |
470 |
/* |
471 |
* read, pop one bit from mii_outbits |
472 |
*/ |
473 |
if (d->mii_outbits & (1<<31)) |
474 |
d->csr[9] |= DEC21140_CSR9_RX_BIT; |
475 |
else |
476 |
d->csr[9] &= ~DEC21140_CSR9_RX_BIT; |
477 |
d->mii_outbits <<= 1; |
478 |
} else if((*data&~DEC21140_CSR9_TX_BIT) == |
479 |
(DEC21140_CSR9_WRITE|DEC21140_CSR9_MDC_CLOCK)) { |
480 |
/* |
481 |
* write, we've got input, do state machine |
482 |
*/ |
483 |
mii_newbit(d,(*data&DEC21140_CSR9_TX_BIT) ? 1 : 0); |
484 |
} |
485 |
break; |
486 |
} |
487 |
} |
488 |
|
489 |
return NULL; |
490 |
} |
491 |
|
492 |
/* |
493 |
* Get the address of the next RX descriptor. |
494 |
*/ |
495 |
static m_uint32_t rxdesc_get_next(struct dec21140_data *d,m_uint32_t rxd_addr, |
496 |
struct rx_desc *rxd) |
497 |
{ |
498 |
m_uint32_t nrxd_addr; |
499 |
|
500 |
/* go to the next descriptor */ |
501 |
if (rxd->rdes[1] & DEC21140_RXDESC_RER) |
502 |
nrxd_addr = d->csr[3]; |
503 |
else { |
504 |
if (rxd->rdes[1] & DEC21140_RXDESC_RCH) |
505 |
nrxd_addr = rxd->rdes[3]; |
506 |
else |
507 |
nrxd_addr = rxd_addr + sizeof(struct rx_desc); |
508 |
} |
509 |
|
510 |
return(nrxd_addr); |
511 |
} |
512 |
|
513 |
/* Read an RX descriptor */ |
514 |
static void rxdesc_read(struct dec21140_data *d,m_uint32_t rxd_addr, |
515 |
struct rx_desc *rxd) |
516 |
{ |
517 |
/* get the next descriptor from VM physical RAM */ |
518 |
physmem_copy_from_vm(d->vm,rxd,rxd_addr,sizeof(struct rx_desc)); |
519 |
|
520 |
/* byte-swapping */ |
521 |
rxd->rdes[0] = vmtoh32(rxd->rdes[0]); |
522 |
rxd->rdes[1] = vmtoh32(rxd->rdes[1]); |
523 |
rxd->rdes[2] = vmtoh32(rxd->rdes[2]); |
524 |
rxd->rdes[3] = vmtoh32(rxd->rdes[3]); |
525 |
} |
526 |
|
527 |
/* |
528 |
* Try to acquire the specified RX descriptor. Returns TRUE if we have it. |
529 |
* It assumes that the byte-swapping is done. |
530 |
*/ |
531 |
static inline int rxdesc_acquire(m_uint32_t rdes0) |
532 |
{ |
533 |
return(rdes0 & DEC21140_RXDESC_OWN); |
534 |
} |
535 |
|
536 |
/* Put a packet in buffer(s) of a descriptor */ |
537 |
static void rxdesc_put_pkt(struct dec21140_data *d,struct rx_desc *rxd, |
538 |
u_char **pkt,ssize_t *pkt_len) |
539 |
{ |
540 |
ssize_t len1,len2,cp_len; |
541 |
|
542 |
/* get rbs1 and rbs2 */ |
543 |
len1 = rxd->rdes[1] & DEC21140_RXDESC_LEN_MASK; |
544 |
len2 = (rxd->rdes[1] >> 10) & DEC21140_RXDESC_LEN_MASK; |
545 |
|
546 |
/* try with buffer #1 */ |
547 |
if (len1 != 0) |
548 |
{ |
549 |
/* compute the data length to copy */ |
550 |
cp_len = m_min(len1,*pkt_len); |
551 |
|
552 |
/* copy packet data to the VM physical RAM */ |
553 |
physmem_copy_to_vm(d->vm,*pkt,rxd->rdes[2],cp_len); |
554 |
|
555 |
*pkt += cp_len; |
556 |
*pkt_len -= cp_len; |
557 |
} |
558 |
|
559 |
/* try with buffer #2 */ |
560 |
if ((len2 != 0) && !(rxd->rdes[1] & DEC21140_RXDESC_RCH)) |
561 |
{ |
562 |
/* compute the data length to copy */ |
563 |
cp_len = m_min(len2,*pkt_len); |
564 |
|
565 |
/* copy packet data to the VM physical RAM */ |
566 |
physmem_copy_to_vm(d->vm,*pkt,rxd->rdes[3],cp_len); |
567 |
|
568 |
*pkt += cp_len; |
569 |
*pkt_len -= cp_len; |
570 |
} |
571 |
} |
572 |
|
573 |
/* |
574 |
* Put a packet in the RX ring of the DEC21140. |
575 |
*/ |
576 |
static int dev_dec21140_receive_pkt(struct dec21140_data *d, |
577 |
u_char *pkt,ssize_t pkt_len) |
578 |
{ |
579 |
m_uint32_t rx_start,rxdn_addr,rxdn_rdes0; |
580 |
struct rx_desc rxd0,rxdn,*rxdc; |
581 |
ssize_t tot_len = pkt_len; |
582 |
u_char *pkt_ptr = pkt; |
583 |
n_eth_hdr_t *hdr; |
584 |
int i; |
585 |
|
586 |
/* Truncate the packet if it is too big */ |
587 |
pkt_len = m_min(pkt_len,DEC21140_MAX_PKT_SIZE); |
588 |
|
589 |
/* Copy the current rxring descriptor */ |
590 |
rxdesc_read(d,d->rx_current,&rxd0); |
591 |
|
592 |
/* We must have the first descriptor... */ |
593 |
if (!rxdesc_acquire(rxd0.rdes[0])) |
594 |
return(FALSE); |
595 |
|
596 |
/* Remember the first RX descriptor address */ |
597 |
rx_start = d->rx_current; |
598 |
|
599 |
for(i=0,rxdc=&rxd0;tot_len>0;i++) |
600 |
{ |
601 |
/* Put data into the descriptor buffers */ |
602 |
rxdesc_put_pkt(d,rxdc,&pkt_ptr,&tot_len); |
603 |
|
604 |
/* Get address of the next descriptor */ |
605 |
rxdn_addr = rxdesc_get_next(d,d->rx_current,rxdc); |
606 |
|
607 |
/* We have finished if the complete packet has been stored */ |
608 |
if (tot_len == 0) { |
609 |
rxdc->rdes[0] = DEC21140_RXDESC_LS; |
610 |
rxdc->rdes[0] |= (pkt_len + 4) << DEC21140_RXDESC_FL_SHIFT; |
611 |
|
612 |
/* if this is a multicast frame, set the appropriate bit */ |
613 |
hdr = (n_eth_hdr_t *)pkt; |
614 |
if (eth_addr_is_mcast(&hdr->daddr)) |
615 |
rxdc->rdes[0] |= DEC21140_RXDESC_MF; |
616 |
|
617 |
if (i != 0) |
618 |
physmem_copy_u32_to_vm(d->vm,d->rx_current,rxdc->rdes[0]); |
619 |
|
620 |
d->rx_current = rxdn_addr; |
621 |
break; |
622 |
} |
623 |
|
624 |
/* Get status of the next descriptor to see if we can acquire it */ |
625 |
rxdn_rdes0 = physmem_copy_u32_from_vm(d->vm,rxdn_addr); |
626 |
|
627 |
if (!rxdesc_acquire(rxdn_rdes0)) |
628 |
rxdc->rdes[0] = DEC21140_RXDESC_LS | DEC21140_RXDESC_DE; |
629 |
else |
630 |
rxdc->rdes[0] = 0; /* ok, no special flag */ |
631 |
|
632 |
/* Update the new status (only if we are not on the first desc) */ |
633 |
if (i != 0) |
634 |
physmem_copy_u32_to_vm(d->vm,d->rx_current,rxdc->rdes[0]); |
635 |
|
636 |
/* Update the RX pointer */ |
637 |
d->rx_current = rxdn_addr; |
638 |
|
639 |
if (rxdc->rdes[0] != 0) |
640 |
break; |
641 |
|
642 |
/* Read the next descriptor from VM physical RAM */ |
643 |
rxdesc_read(d,rxdn_addr,&rxdn); |
644 |
rxdc = &rxdn; |
645 |
} |
646 |
|
647 |
/* Update the first RX descriptor */ |
648 |
rxd0.rdes[0] |= DEC21140_RXDESC_FS; |
649 |
physmem_copy_u32_to_vm(d->vm,rx_start,rxd0.rdes[0]); |
650 |
|
651 |
/* Indicate that we have a frame ready */ |
652 |
d->csr[5] |= DEC21140_CSR5_RI; |
653 |
|
654 |
/* Generate IRQ on CPU */ |
655 |
pci_dev_trigger_irq(d->vm,d->pci_dev); |
656 |
return(TRUE); |
657 |
} |
658 |
|
659 |
/* Handle the DEC21140 RX ring */ |
660 |
static int dev_dec21140_handle_rxring(netio_desc_t *nio, |
661 |
u_char *pkt,ssize_t pkt_len, |
662 |
struct dec21140_data *d) |
663 |
{ |
664 |
/* |
665 |
* Don't start receive if the RX ring address has not been set |
666 |
* and if the SR bit in CSR6 is not set yet. |
667 |
*/ |
668 |
if ((d->csr[3] == 0) || !(d->csr[6] & DEC21140_CSR6_START_RX)) |
669 |
return(FALSE); |
670 |
|
671 |
#if DEBUG_RECEIVE |
672 |
DEC21140_LOG(d,"receiving a packet of %d bytes\n",pkt_len); |
673 |
mem_dump(log_file,pkt,pkt_len); |
674 |
#endif |
675 |
|
676 |
/* |
677 |
* Receive only multicast/broadcast trafic + unicast traffic |
678 |
* for this virtual machine. |
679 |
*/ |
680 |
if (dec21140_handle_mac_addr(d,pkt)) |
681 |
return(dev_dec21140_receive_pkt(d,pkt,pkt_len)); |
682 |
|
683 |
return(FALSE); |
684 |
} |
685 |
|
686 |
/* Read a TX descriptor */ |
687 |
static void txdesc_read(struct dec21140_data *d,m_uint32_t txd_addr, |
688 |
struct tx_desc *txd) |
689 |
{ |
690 |
/* get the descriptor from VM physical RAM */ |
691 |
physmem_copy_from_vm(d->vm,txd,txd_addr,sizeof(struct tx_desc)); |
692 |
|
693 |
/* byte-swapping */ |
694 |
txd->tdes[0] = vmtoh32(txd->tdes[0]); |
695 |
txd->tdes[1] = vmtoh32(txd->tdes[1]); |
696 |
txd->tdes[2] = vmtoh32(txd->tdes[2]); |
697 |
txd->tdes[3] = vmtoh32(txd->tdes[3]); |
698 |
} |
699 |
|
700 |
/* Set the address of the next TX descriptor */ |
701 |
static void txdesc_set_next(struct dec21140_data *d,struct tx_desc *txd) |
702 |
{ |
703 |
if (txd->tdes[1] & DEC21140_TXDESC_TER) |
704 |
d->tx_current = d->csr[4]; |
705 |
else { |
706 |
if (txd->tdes[1] & DEC21140_TXDESC_TCH) |
707 |
d->tx_current = txd->tdes[3]; |
708 |
else |
709 |
d->tx_current += sizeof(struct tx_desc); |
710 |
} |
711 |
} |
712 |
|
713 |
/* Handle the TX ring (single packet) */ |
714 |
static int dev_dec21140_handle_txring_single(struct dec21140_data *d) |
715 |
{ |
716 |
u_char pkt[DEC21140_MAX_PKT_SIZE],*pkt_ptr; |
717 |
u_char setup_frame[DEC21140_SETUP_FRAME_SIZE]; |
718 |
m_uint32_t tx_start,len1,len2,clen,tot_len; |
719 |
struct tx_desc txd0,ctxd,*ptxd; |
720 |
int done = FALSE; |
721 |
|
722 |
/* |
723 |
* Don't start transmit if the txring address has not been set |
724 |
* and if the ST bit in CSR6 is not set yet. |
725 |
*/ |
726 |
if ((d->csr[4] == 0) || (!(d->csr[6] & DEC21140_CSR6_START_TX))) |
727 |
return(FALSE); |
728 |
|
729 |
/* Copy the current txring descriptor */ |
730 |
tx_start = d->tx_current; |
731 |
ptxd = &txd0; |
732 |
txdesc_read(d,d->tx_current,ptxd); |
733 |
|
734 |
/* If we don't own the first descriptor, we cannot transmit */ |
735 |
if (!(txd0.tdes[0] & DEC21140_TXDESC_OWN)) |
736 |
return(FALSE); |
737 |
|
738 |
/* |
739 |
* Ignore setup frames (clear the own bit and skip). |
740 |
* We extract unicast MAC addresses to allow only appropriate traffic |
741 |
* to pass. |
742 |
*/ |
743 |
if (!(txd0.tdes[1] & (DEC21140_TXDESC_FS|DEC21140_TXDESC_LS))) |
744 |
{ |
745 |
len1 = ptxd->tdes[1] & DEC21140_TXDESC_LEN_MASK; |
746 |
len2 = (ptxd->tdes[1] >> 11) & DEC21140_TXDESC_LEN_MASK; |
747 |
|
748 |
if (txd0.tdes[1] & DEC21140_TXDESC_SET) { |
749 |
physmem_copy_from_vm(d->vm,setup_frame,ptxd->tdes[2], |
750 |
sizeof(setup_frame)); |
751 |
dec21140_update_mac_addr(d,setup_frame); |
752 |
} |
753 |
|
754 |
txdesc_set_next(d,ptxd); |
755 |
goto clear_txd0_own_bit; |
756 |
} |
757 |
|
758 |
#if DEBUG_TRANSMIT |
759 |
DEC21140_LOG(d,"dec21140_handle_txring: 1st desc: " |
760 |
"tdes[0]=0x%x, tdes[1]=0x%x, tdes[2]=0x%x, tdes[3]=0x%x\n", |
761 |
ptxd->tdes[0],ptxd->tdes[1],ptxd->tdes[2],ptxd->tdes[3]); |
762 |
#endif |
763 |
|
764 |
/* Empty packet for now */ |
765 |
pkt_ptr = pkt; |
766 |
tot_len = 0; |
767 |
|
768 |
do { |
769 |
#if DEBUG_TRANSMIT |
770 |
DEC21140_LOG(d,"dec21140_handle_txring: loop: " |
771 |
"tdes[0]=0x%x, tdes[1]=0x%x, tdes[2]=0x%x, tdes[3]=0x%x\n", |
772 |
ptxd->tdes[0],ptxd->tdes[1],ptxd->tdes[2],ptxd->tdes[3]); |
773 |
#endif |
774 |
|
775 |
if (!(ptxd->tdes[0] & DEC21140_TXDESC_OWN)) { |
776 |
DEC21140_LOG(d,"dec21140_handle_txring: descriptor not owned!\n"); |
777 |
return(FALSE); |
778 |
} |
779 |
|
780 |
len1 = ptxd->tdes[1] & DEC21140_TXDESC_LEN_MASK; |
781 |
len2 = (ptxd->tdes[1] >> 11) & DEC21140_TXDESC_LEN_MASK; |
782 |
clen = len1 + len2; |
783 |
|
784 |
/* Be sure that we have either len1 or len2 not null */ |
785 |
if (clen != 0) |
786 |
{ |
787 |
if (len1 != 0) |
788 |
physmem_copy_from_vm(d->vm,pkt_ptr,ptxd->tdes[2],len1); |
789 |
|
790 |
if ((len2 != 0) && !(ptxd->tdes[1] & DEC21140_TXDESC_TCH)) |
791 |
physmem_copy_from_vm(d->vm,pkt_ptr+len1,ptxd->tdes[3],len2); |
792 |
} |
793 |
|
794 |
pkt_ptr += clen; |
795 |
tot_len += clen; |
796 |
|
797 |
/* Clear the OWN bit if this is not the first descriptor */ |
798 |
if (!(ptxd->tdes[1] & DEC21140_TXDESC_FS)) |
799 |
physmem_copy_u32_to_vm(d->vm,d->tx_current,0); |
800 |
|
801 |
/* Go to the next descriptor */ |
802 |
txdesc_set_next(d,ptxd); |
803 |
|
804 |
/* |
805 |
* Copy the next txring descriptor (ignore setup frames that |
806 |
* have both FS and LS bit cleared). |
807 |
*/ |
808 |
if (!(ptxd->tdes[1] & (DEC21140_TXDESC_LS|DEC21140_TXDESC_SET))) { |
809 |
txdesc_read(d,d->tx_current,&ctxd); |
810 |
ptxd = &ctxd; |
811 |
} else |
812 |
done = TRUE; |
813 |
}while(!done); |
814 |
|
815 |
if (tot_len != 0) { |
816 |
#if DEBUG_TRANSMIT |
817 |
DEC21140_LOG(d,"sending packet of %u bytes\n",tot_len); |
818 |
mem_dump(log_file,pkt,tot_len); |
819 |
#endif |
820 |
/* rewrite ISL header if required */ |
821 |
dec21140_isl_rewrite(pkt,tot_len); |
822 |
|
823 |
/* send it on wire */ |
824 |
netio_send(d->nio,pkt,tot_len); |
825 |
} |
826 |
|
827 |
clear_txd0_own_bit: |
828 |
/* Clear the OWN flag of the first descriptor */ |
829 |
physmem_copy_u32_to_vm(d->vm,tx_start,0); |
830 |
|
831 |
/* Interrupt on completion ? */ |
832 |
if (!(txd0.tdes[1] & DEC21140_TXDESC_IC)) { |
833 |
d->csr[5] |= DEC21140_CSR5_TI; |
834 |
pci_dev_trigger_irq(d->vm,d->pci_dev); |
835 |
} |
836 |
|
837 |
return(TRUE); |
838 |
} |
839 |
|
840 |
/* Handle the TX ring */ |
841 |
static int dev_dec21140_handle_txring(struct dec21140_data *d) |
842 |
{ |
843 |
int i; |
844 |
|
845 |
for(i=0;i<DEC21140_TXRING_PASS_COUNT;i++) |
846 |
if (!dev_dec21140_handle_txring_single(d)) |
847 |
break; |
848 |
|
849 |
return(TRUE); |
850 |
} |
851 |
|
852 |
/* |
853 |
* pci_dec21140_read() |
854 |
* |
855 |
* Read a PCI register. |
856 |
*/ |
857 |
static m_uint32_t pci_dec21140_read(cpu_mips_t *cpu,struct pci_device *dev, |
858 |
int reg) |
859 |
{ |
860 |
struct dec21140_data *d = dev->priv_data; |
861 |
|
862 |
#if DEBUG_PCI_REGS |
863 |
DEC21140_LOG(d,"read C%s(%u)\n",pci_cfgreg_name(reg),reg); |
864 |
#endif |
865 |
|
866 |
switch (reg) { |
867 |
case DEC21140_PCI_CFID_REG_OFFSET: |
868 |
return(0x00091011); |
869 |
case DEC21140_PCI_CFRV_REG_OFFSET: |
870 |
return(0x02000011); |
871 |
case DEC21140_PCI_CBMA_REG_OFFSET: |
872 |
return(d->dev->phys_addr); |
873 |
default: |
874 |
return(0); |
875 |
} |
876 |
} |
877 |
|
878 |
/* |
879 |
* pci_dec21140_write() |
880 |
* |
881 |
* Write a PCI register. |
882 |
*/ |
883 |
static void pci_dec21140_write(cpu_mips_t *cpu,struct pci_device *dev, |
884 |
int reg,m_uint32_t value) |
885 |
{ |
886 |
struct dec21140_data *d = dev->priv_data; |
887 |
|
888 |
#if DEBUG_PCI_REGS |
889 |
DEC21140_LOG(d,"write C%s(%u) value 0x%x\n",pci_cfgreg_name(reg),reg,value); |
890 |
#endif |
891 |
|
892 |
switch(reg) { |
893 |
case DEC21140_PCI_CBMA_REG_OFFSET: |
894 |
vm_map_device(cpu->vm,d->dev,(m_uint64_t)value); |
895 |
DEC21140_LOG(d,"registers are mapped at 0x%x\n",value); |
896 |
break; |
897 |
} |
898 |
} |
899 |
|
900 |
/* |
901 |
* dev_dec21140_init() |
902 |
* |
903 |
* Generic DEC21140 initialization code. |
904 |
*/ |
905 |
struct dec21140_data *dev_dec21140_init(vm_instance_t *vm,char *name, |
906 |
struct pci_bus *pci_bus,int pci_device, |
907 |
int irq) |
908 |
{ |
909 |
struct dec21140_data *d; |
910 |
struct pci_device *pci_dev; |
911 |
struct vdevice *dev; |
912 |
|
913 |
/* Allocate the private data structure for DEC21140 */ |
914 |
if (!(d = malloc(sizeof(*d)))) { |
915 |
fprintf(stderr,"%s (DEC21140): out of memory\n",name); |
916 |
return NULL; |
917 |
} |
918 |
|
919 |
memset(d,0,sizeof(*d)); |
920 |
|
921 |
/* Add as PCI device */ |
922 |
pci_dev = pci_dev_add(pci_bus,name, |
923 |
DEC21140_PCI_VENDOR_ID,DEC21140_PCI_PRODUCT_ID, |
924 |
pci_device,0,irq, |
925 |
d,NULL,pci_dec21140_read,pci_dec21140_write); |
926 |
|
927 |
if (!pci_dev) { |
928 |
fprintf(stderr,"%s (DEC21140): unable to create PCI device.\n",name); |
929 |
goto err_pci_dev; |
930 |
} |
931 |
|
932 |
/* Create the device itself */ |
933 |
if (!(dev = dev_create(name))) { |
934 |
fprintf(stderr,"%s (DEC21140): unable to create device.\n",name); |
935 |
goto err_dev; |
936 |
} |
937 |
|
938 |
d->name = name; |
939 |
d->vm = vm; |
940 |
d->pci_dev = pci_dev; |
941 |
d->dev = dev; |
942 |
|
943 |
/* Basic register setup */ |
944 |
d->csr[0] = 0xfff80000; |
945 |
d->csr[5] = 0xfc000000; |
946 |
d->csr[8] = 0xfffe0000; |
947 |
|
948 |
dev->phys_addr = 0; |
949 |
dev->phys_len = 0x20000; |
950 |
dev->handler = dev_dec21140_access; |
951 |
dev->priv_data = d; |
952 |
return(d); |
953 |
|
954 |
err_dev: |
955 |
pci_dev_remove(pci_dev); |
956 |
err_pci_dev: |
957 |
free(d); |
958 |
return NULL; |
959 |
} |
960 |
|
961 |
/* Remove a DEC21140 device */ |
962 |
void dev_dec21140_remove(struct dec21140_data *d) |
963 |
{ |
964 |
if (d != NULL) { |
965 |
pci_dev_remove(d->pci_dev); |
966 |
vm_unbind_device(d->vm,d->dev); |
967 |
cpu_group_rebuild_mts(d->vm->cpu_group); |
968 |
free(d->dev); |
969 |
free(d); |
970 |
} |
971 |
} |
972 |
|
973 |
/* Bind a NIO to DEC21140 device */ |
974 |
int dev_dec21140_set_nio(struct dec21140_data *d,netio_desc_t *nio) |
975 |
{ |
976 |
/* check that a NIO is not already bound */ |
977 |
if (d->nio != NULL) |
978 |
return(-1); |
979 |
|
980 |
d->nio = nio; |
981 |
d->tx_tid = ptask_add((ptask_callback)dev_dec21140_handle_txring,d,NULL); |
982 |
netio_rxl_add(nio,(netio_rx_handler_t)dev_dec21140_handle_rxring,d,NULL); |
983 |
return(0); |
984 |
} |
985 |
|
986 |
/* Unbind a NIO from a DEC21140 device */ |
987 |
void dev_dec21140_unset_nio(struct dec21140_data *d) |
988 |
{ |
989 |
if (d->nio != NULL) { |
990 |
ptask_remove(d->tx_tid); |
991 |
netio_rxl_remove(d->nio); |
992 |
d->nio = NULL; |
993 |
} |
994 |
} |