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4c521e42 DM |
1 | /* sunvnet.c: Sun LDOM Virtual Network Driver. |
2 | * | |
3 | * Copyright (C) 2007 David S. Miller <davem@davemloft.net> | |
4 | */ | |
5 | ||
6 | #include <linux/module.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/types.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/delay.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/netdevice.h> | |
13 | #include <linux/ethtool.h> | |
14 | #include <linux/etherdevice.h> | |
15 | ||
16 | #include <asm/vio.h> | |
17 | #include <asm/ldc.h> | |
18 | ||
19 | #include "sunvnet.h" | |
20 | ||
21 | #define DRV_MODULE_NAME "sunvnet" | |
22 | #define PFX DRV_MODULE_NAME ": " | |
23 | #define DRV_MODULE_VERSION "1.0" | |
24 | #define DRV_MODULE_RELDATE "June 25, 2007" | |
25 | ||
26 | static char version[] __devinitdata = | |
27 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; | |
28 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
29 | MODULE_DESCRIPTION("Sun LDOM virtual network driver"); | |
30 | MODULE_LICENSE("GPL"); | |
31 | MODULE_VERSION(DRV_MODULE_VERSION); | |
32 | ||
33 | /* Ordered from largest major to lowest */ | |
34 | static struct vio_version vnet_versions[] = { | |
35 | { .major = 1, .minor = 0 }, | |
36 | }; | |
37 | ||
38 | static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr) | |
39 | { | |
40 | return vio_dring_avail(dr, VNET_TX_RING_SIZE); | |
41 | } | |
42 | ||
43 | static int vnet_handle_unknown(struct vnet_port *port, void *arg) | |
44 | { | |
45 | struct vio_msg_tag *pkt = arg; | |
46 | ||
47 | printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n", | |
48 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); | |
49 | printk(KERN_ERR PFX "Resetting connection.\n"); | |
50 | ||
51 | ldc_disconnect(port->vio.lp); | |
52 | ||
53 | return -ECONNRESET; | |
54 | } | |
55 | ||
56 | static int vnet_send_attr(struct vio_driver_state *vio) | |
57 | { | |
58 | struct vnet_port *port = to_vnet_port(vio); | |
59 | struct net_device *dev = port->vp->dev; | |
60 | struct vio_net_attr_info pkt; | |
61 | int i; | |
62 | ||
63 | memset(&pkt, 0, sizeof(pkt)); | |
64 | pkt.tag.type = VIO_TYPE_CTRL; | |
65 | pkt.tag.stype = VIO_SUBTYPE_INFO; | |
66 | pkt.tag.stype_env = VIO_ATTR_INFO; | |
67 | pkt.tag.sid = vio_send_sid(vio); | |
68 | pkt.xfer_mode = VIO_DRING_MODE; | |
69 | pkt.addr_type = VNET_ADDR_ETHERMAC; | |
70 | pkt.ack_freq = 0; | |
71 | for (i = 0; i < 6; i++) | |
72 | pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8); | |
73 | pkt.mtu = ETH_FRAME_LEN; | |
74 | ||
75 | viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " | |
76 | "ackfreq[%u] mtu[%llu]\n", | |
77 | pkt.xfer_mode, pkt.addr_type, | |
78 | (unsigned long long) pkt.addr, | |
79 | pkt.ack_freq, | |
80 | (unsigned long long) pkt.mtu); | |
81 | ||
82 | return vio_ldc_send(vio, &pkt, sizeof(pkt)); | |
83 | } | |
84 | ||
85 | static int handle_attr_info(struct vio_driver_state *vio, | |
86 | struct vio_net_attr_info *pkt) | |
87 | { | |
88 | viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] " | |
89 | "ackfreq[%u] mtu[%llu]\n", | |
90 | pkt->xfer_mode, pkt->addr_type, | |
91 | (unsigned long long) pkt->addr, | |
92 | pkt->ack_freq, | |
93 | (unsigned long long) pkt->mtu); | |
94 | ||
95 | pkt->tag.sid = vio_send_sid(vio); | |
96 | ||
97 | if (pkt->xfer_mode != VIO_DRING_MODE || | |
98 | pkt->addr_type != VNET_ADDR_ETHERMAC || | |
99 | pkt->mtu != ETH_FRAME_LEN) { | |
100 | viodbg(HS, "SEND NET ATTR NACK\n"); | |
101 | ||
102 | pkt->tag.stype = VIO_SUBTYPE_NACK; | |
103 | ||
104 | (void) vio_ldc_send(vio, pkt, sizeof(*pkt)); | |
105 | ||
106 | return -ECONNRESET; | |
107 | } else { | |
108 | viodbg(HS, "SEND NET ATTR ACK\n"); | |
109 | ||
110 | pkt->tag.stype = VIO_SUBTYPE_ACK; | |
111 | ||
112 | return vio_ldc_send(vio, pkt, sizeof(*pkt)); | |
113 | } | |
114 | ||
115 | } | |
116 | ||
117 | static int handle_attr_ack(struct vio_driver_state *vio, | |
118 | struct vio_net_attr_info *pkt) | |
119 | { | |
120 | viodbg(HS, "GOT NET ATTR ACK\n"); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int handle_attr_nack(struct vio_driver_state *vio, | |
126 | struct vio_net_attr_info *pkt) | |
127 | { | |
128 | viodbg(HS, "GOT NET ATTR NACK\n"); | |
129 | ||
130 | return -ECONNRESET; | |
131 | } | |
132 | ||
133 | static int vnet_handle_attr(struct vio_driver_state *vio, void *arg) | |
134 | { | |
135 | struct vio_net_attr_info *pkt = arg; | |
136 | ||
137 | switch (pkt->tag.stype) { | |
138 | case VIO_SUBTYPE_INFO: | |
139 | return handle_attr_info(vio, pkt); | |
140 | ||
141 | case VIO_SUBTYPE_ACK: | |
142 | return handle_attr_ack(vio, pkt); | |
143 | ||
144 | case VIO_SUBTYPE_NACK: | |
145 | return handle_attr_nack(vio, pkt); | |
146 | ||
147 | default: | |
148 | return -ECONNRESET; | |
149 | } | |
150 | } | |
151 | ||
152 | static void vnet_handshake_complete(struct vio_driver_state *vio) | |
153 | { | |
154 | struct vio_dring_state *dr; | |
155 | ||
156 | dr = &vio->drings[VIO_DRIVER_RX_RING]; | |
157 | dr->snd_nxt = dr->rcv_nxt = 1; | |
158 | ||
159 | dr = &vio->drings[VIO_DRIVER_TX_RING]; | |
160 | dr->snd_nxt = dr->rcv_nxt = 1; | |
161 | } | |
162 | ||
163 | /* The hypervisor interface that implements copying to/from imported | |
164 | * memory from another domain requires that copies are done to 8-byte | |
165 | * aligned buffers, and that the lengths of such copies are also 8-byte | |
166 | * multiples. | |
167 | * | |
168 | * So we align skb->data to an 8-byte multiple and pad-out the data | |
169 | * area so we can round the copy length up to the next multiple of | |
170 | * 8 for the copy. | |
171 | * | |
172 | * The transmitter puts the actual start of the packet 6 bytes into | |
173 | * the buffer it sends over, so that the IP headers after the ethernet | |
174 | * header are aligned properly. These 6 bytes are not in the descriptor | |
175 | * length, they are simply implied. This offset is represented using | |
176 | * the VNET_PACKET_SKIP macro. | |
177 | */ | |
178 | static struct sk_buff *alloc_and_align_skb(struct net_device *dev, | |
179 | unsigned int len) | |
180 | { | |
181 | struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8); | |
182 | unsigned long addr, off; | |
183 | ||
184 | if (unlikely(!skb)) | |
185 | return NULL; | |
186 | ||
187 | addr = (unsigned long) skb->data; | |
188 | off = ((addr + 7UL) & ~7UL) - addr; | |
189 | if (off) | |
190 | skb_reserve(skb, off); | |
191 | ||
192 | return skb; | |
193 | } | |
194 | ||
195 | static int vnet_rx_one(struct vnet_port *port, unsigned int len, | |
196 | struct ldc_trans_cookie *cookies, int ncookies) | |
197 | { | |
198 | struct net_device *dev = port->vp->dev; | |
199 | unsigned int copy_len; | |
200 | struct sk_buff *skb; | |
201 | int err; | |
202 | ||
203 | err = -EMSGSIZE; | |
204 | if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) { | |
205 | dev->stats.rx_length_errors++; | |
206 | goto out_dropped; | |
207 | } | |
208 | ||
209 | skb = alloc_and_align_skb(dev, len); | |
210 | err = -ENOMEM; | |
211 | if (unlikely(!skb)) { | |
212 | dev->stats.rx_missed_errors++; | |
213 | goto out_dropped; | |
214 | } | |
215 | ||
216 | copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U; | |
217 | skb_put(skb, copy_len); | |
218 | err = ldc_copy(port->vio.lp, LDC_COPY_IN, | |
219 | skb->data, copy_len, 0, | |
220 | cookies, ncookies); | |
221 | if (unlikely(err < 0)) { | |
222 | dev->stats.rx_frame_errors++; | |
223 | goto out_free_skb; | |
224 | } | |
225 | ||
226 | skb_pull(skb, VNET_PACKET_SKIP); | |
227 | skb_trim(skb, len); | |
228 | skb->protocol = eth_type_trans(skb, dev); | |
229 | ||
230 | dev->stats.rx_packets++; | |
231 | dev->stats.rx_bytes += len; | |
232 | ||
233 | netif_rx(skb); | |
234 | ||
235 | return 0; | |
236 | ||
237 | out_free_skb: | |
238 | kfree_skb(skb); | |
239 | ||
240 | out_dropped: | |
241 | dev->stats.rx_dropped++; | |
242 | return err; | |
243 | } | |
244 | ||
245 | static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr, | |
246 | u32 start, u32 end, u8 vio_dring_state) | |
247 | { | |
248 | struct vio_dring_data hdr = { | |
249 | .tag = { | |
250 | .type = VIO_TYPE_DATA, | |
251 | .stype = VIO_SUBTYPE_ACK, | |
252 | .stype_env = VIO_DRING_DATA, | |
253 | .sid = vio_send_sid(&port->vio), | |
254 | }, | |
255 | .dring_ident = dr->ident, | |
256 | .start_idx = start, | |
257 | .end_idx = end, | |
258 | .state = vio_dring_state, | |
259 | }; | |
260 | int err, delay; | |
261 | ||
262 | hdr.seq = dr->snd_nxt; | |
263 | delay = 1; | |
264 | do { | |
265 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
266 | if (err > 0) { | |
267 | dr->snd_nxt++; | |
268 | break; | |
269 | } | |
270 | udelay(delay); | |
271 | if ((delay <<= 1) > 128) | |
272 | delay = 128; | |
273 | } while (err == -EAGAIN); | |
274 | ||
275 | return err; | |
276 | } | |
277 | ||
278 | static u32 next_idx(u32 idx, struct vio_dring_state *dr) | |
279 | { | |
280 | if (++idx == dr->num_entries) | |
281 | idx = 0; | |
282 | return idx; | |
283 | } | |
284 | ||
285 | static u32 prev_idx(u32 idx, struct vio_dring_state *dr) | |
286 | { | |
287 | if (idx == 0) | |
288 | idx = dr->num_entries - 1; | |
289 | else | |
290 | idx--; | |
291 | ||
292 | return idx; | |
293 | } | |
294 | ||
295 | static struct vio_net_desc *get_rx_desc(struct vnet_port *port, | |
296 | struct vio_dring_state *dr, | |
297 | u32 index) | |
298 | { | |
299 | struct vio_net_desc *desc = port->vio.desc_buf; | |
300 | int err; | |
301 | ||
302 | err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size, | |
303 | (index * dr->entry_size), | |
304 | dr->cookies, dr->ncookies); | |
305 | if (err < 0) | |
306 | return ERR_PTR(err); | |
307 | ||
308 | return desc; | |
309 | } | |
310 | ||
311 | static int put_rx_desc(struct vnet_port *port, | |
312 | struct vio_dring_state *dr, | |
313 | struct vio_net_desc *desc, | |
314 | u32 index) | |
315 | { | |
316 | int err; | |
317 | ||
318 | err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size, | |
319 | (index * dr->entry_size), | |
320 | dr->cookies, dr->ncookies); | |
321 | if (err < 0) | |
322 | return err; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static int vnet_walk_rx_one(struct vnet_port *port, | |
328 | struct vio_dring_state *dr, | |
329 | u32 index, int *needs_ack) | |
330 | { | |
331 | struct vio_net_desc *desc = get_rx_desc(port, dr, index); | |
332 | struct vio_driver_state *vio = &port->vio; | |
333 | int err; | |
334 | ||
335 | if (IS_ERR(desc)) | |
336 | return PTR_ERR(desc); | |
337 | ||
338 | viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%lx:%lx]\n", | |
339 | desc->hdr.state, desc->hdr.ack, | |
340 | desc->size, desc->ncookies, | |
341 | desc->cookies[0].cookie_addr, | |
342 | desc->cookies[0].cookie_size); | |
343 | ||
344 | if (desc->hdr.state != VIO_DESC_READY) | |
345 | return 1; | |
346 | err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies); | |
347 | if (err == -ECONNRESET) | |
348 | return err; | |
349 | desc->hdr.state = VIO_DESC_DONE; | |
350 | err = put_rx_desc(port, dr, desc, index); | |
351 | if (err < 0) | |
352 | return err; | |
353 | *needs_ack = desc->hdr.ack; | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, | |
358 | u32 start, u32 end) | |
359 | { | |
360 | struct vio_driver_state *vio = &port->vio; | |
361 | int ack_start = -1, ack_end = -1; | |
362 | ||
363 | end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr); | |
364 | ||
365 | viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end); | |
366 | ||
367 | while (start != end) { | |
368 | int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack); | |
369 | if (err == -ECONNRESET) | |
370 | return err; | |
371 | if (err != 0) | |
372 | break; | |
373 | if (ack_start == -1) | |
374 | ack_start = start; | |
375 | ack_end = start; | |
376 | start = next_idx(start, dr); | |
377 | if (ack && start != end) { | |
378 | err = vnet_send_ack(port, dr, ack_start, ack_end, | |
379 | VIO_DRING_ACTIVE); | |
380 | if (err == -ECONNRESET) | |
381 | return err; | |
382 | ack_start = -1; | |
383 | } | |
384 | } | |
385 | if (unlikely(ack_start == -1)) | |
386 | ack_start = ack_end = prev_idx(start, dr); | |
387 | return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED); | |
388 | } | |
389 | ||
390 | static int vnet_rx(struct vnet_port *port, void *msgbuf) | |
391 | { | |
392 | struct vio_dring_data *pkt = msgbuf; | |
393 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING]; | |
394 | struct vio_driver_state *vio = &port->vio; | |
395 | ||
396 | viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016lx] rcv_nxt[%016lx]\n", | |
397 | pkt->tag.stype_env, pkt->seq, dr->rcv_nxt); | |
398 | ||
399 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) | |
400 | return 0; | |
401 | if (unlikely(pkt->seq != dr->rcv_nxt)) { | |
402 | printk(KERN_ERR PFX "RX out of sequence seq[0x%lx] " | |
403 | "rcv_nxt[0x%lx]\n", pkt->seq, dr->rcv_nxt); | |
404 | return 0; | |
405 | } | |
406 | ||
407 | dr->rcv_nxt++; | |
408 | ||
409 | /* XXX Validate pkt->start_idx and pkt->end_idx XXX */ | |
410 | ||
411 | return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx); | |
412 | } | |
413 | ||
414 | static int idx_is_pending(struct vio_dring_state *dr, u32 end) | |
415 | { | |
416 | u32 idx = dr->cons; | |
417 | int found = 0; | |
418 | ||
419 | while (idx != dr->prod) { | |
420 | if (idx == end) { | |
421 | found = 1; | |
422 | break; | |
423 | } | |
424 | idx = next_idx(idx, dr); | |
425 | } | |
426 | return found; | |
427 | } | |
428 | ||
429 | static int vnet_ack(struct vnet_port *port, void *msgbuf) | |
430 | { | |
431 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
432 | struct vio_dring_data *pkt = msgbuf; | |
433 | struct net_device *dev; | |
434 | struct vnet *vp; | |
435 | u32 end; | |
436 | ||
437 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) | |
438 | return 0; | |
439 | ||
440 | end = pkt->end_idx; | |
441 | if (unlikely(!idx_is_pending(dr, end))) | |
442 | return 0; | |
443 | ||
444 | dr->cons = next_idx(end, dr); | |
445 | ||
446 | vp = port->vp; | |
447 | dev = vp->dev; | |
448 | if (unlikely(netif_queue_stopped(dev) && | |
449 | vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr))) | |
450 | return 1; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static int vnet_nack(struct vnet_port *port, void *msgbuf) | |
456 | { | |
457 | /* XXX just reset or similar XXX */ | |
458 | return 0; | |
459 | } | |
460 | ||
461 | static void maybe_tx_wakeup(struct vnet *vp) | |
462 | { | |
463 | struct net_device *dev = vp->dev; | |
464 | ||
465 | netif_tx_lock(dev); | |
466 | if (likely(netif_queue_stopped(dev))) { | |
467 | struct vnet_port *port; | |
468 | int wake = 1; | |
469 | ||
470 | list_for_each_entry(port, &vp->port_list, list) { | |
471 | struct vio_dring_state *dr; | |
472 | ||
473 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
474 | if (vnet_tx_dring_avail(dr) < | |
475 | VNET_TX_WAKEUP_THRESH(dr)) { | |
476 | wake = 0; | |
477 | break; | |
478 | } | |
479 | } | |
480 | if (wake) | |
481 | netif_wake_queue(dev); | |
482 | } | |
483 | netif_tx_unlock(dev); | |
484 | } | |
485 | ||
486 | static void vnet_event(void *arg, int event) | |
487 | { | |
488 | struct vnet_port *port = arg; | |
489 | struct vio_driver_state *vio = &port->vio; | |
490 | unsigned long flags; | |
491 | int tx_wakeup, err; | |
492 | ||
493 | spin_lock_irqsave(&vio->lock, flags); | |
494 | ||
495 | if (unlikely(event == LDC_EVENT_RESET || | |
496 | event == LDC_EVENT_UP)) { | |
497 | vio_link_state_change(vio, event); | |
498 | spin_unlock_irqrestore(&vio->lock, flags); | |
499 | ||
500 | return; | |
501 | } | |
502 | ||
503 | if (unlikely(event != LDC_EVENT_DATA_READY)) { | |
504 | printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event); | |
505 | spin_unlock_irqrestore(&vio->lock, flags); | |
506 | return; | |
507 | } | |
508 | ||
509 | tx_wakeup = err = 0; | |
510 | while (1) { | |
511 | union { | |
512 | struct vio_msg_tag tag; | |
513 | u64 raw[8]; | |
514 | } msgbuf; | |
515 | ||
516 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); | |
517 | if (unlikely(err < 0)) { | |
518 | if (err == -ECONNRESET) | |
519 | vio_conn_reset(vio); | |
520 | break; | |
521 | } | |
522 | if (err == 0) | |
523 | break; | |
524 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", | |
525 | msgbuf.tag.type, | |
526 | msgbuf.tag.stype, | |
527 | msgbuf.tag.stype_env, | |
528 | msgbuf.tag.sid); | |
529 | err = vio_validate_sid(vio, &msgbuf.tag); | |
530 | if (err < 0) | |
531 | break; | |
532 | ||
533 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { | |
534 | if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { | |
535 | err = vnet_rx(port, &msgbuf); | |
536 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { | |
537 | err = vnet_ack(port, &msgbuf); | |
538 | if (err > 0) | |
539 | tx_wakeup |= err; | |
540 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) { | |
541 | err = vnet_nack(port, &msgbuf); | |
542 | } | |
543 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { | |
544 | err = vio_control_pkt_engine(vio, &msgbuf); | |
545 | if (err) | |
546 | break; | |
547 | } else { | |
548 | err = vnet_handle_unknown(port, &msgbuf); | |
549 | } | |
550 | if (err == -ECONNRESET) | |
551 | break; | |
552 | } | |
553 | spin_unlock(&vio->lock); | |
554 | if (unlikely(tx_wakeup && err != -ECONNRESET)) | |
555 | maybe_tx_wakeup(port->vp); | |
556 | local_irq_restore(flags); | |
557 | } | |
558 | ||
559 | static int __vnet_tx_trigger(struct vnet_port *port) | |
560 | { | |
561 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
562 | struct vio_dring_data hdr = { | |
563 | .tag = { | |
564 | .type = VIO_TYPE_DATA, | |
565 | .stype = VIO_SUBTYPE_INFO, | |
566 | .stype_env = VIO_DRING_DATA, | |
567 | .sid = vio_send_sid(&port->vio), | |
568 | }, | |
569 | .dring_ident = dr->ident, | |
570 | .start_idx = dr->prod, | |
571 | .end_idx = (u32) -1, | |
572 | }; | |
573 | int err, delay; | |
574 | ||
575 | hdr.seq = dr->snd_nxt; | |
576 | delay = 1; | |
577 | do { | |
578 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); | |
579 | if (err > 0) { | |
580 | dr->snd_nxt++; | |
581 | break; | |
582 | } | |
583 | udelay(delay); | |
584 | if ((delay <<= 1) > 128) | |
585 | delay = 128; | |
586 | } while (err == -EAGAIN); | |
587 | ||
588 | return err; | |
589 | } | |
590 | ||
591 | struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) | |
592 | { | |
593 | unsigned int hash = vnet_hashfn(skb->data); | |
594 | struct hlist_head *hp = &vp->port_hash[hash]; | |
595 | struct hlist_node *n; | |
596 | struct vnet_port *port; | |
597 | ||
598 | hlist_for_each_entry(port, n, hp, hash) { | |
599 | if (!compare_ether_addr(port->raddr, skb->data)) | |
600 | return port; | |
601 | } | |
602 | port = NULL; | |
603 | if (!list_empty(&vp->port_list)) | |
604 | port = list_entry(vp->port_list.next, struct vnet_port, list); | |
605 | ||
606 | return port; | |
607 | } | |
608 | ||
609 | struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb) | |
610 | { | |
611 | struct vnet_port *ret; | |
612 | unsigned long flags; | |
613 | ||
614 | spin_lock_irqsave(&vp->lock, flags); | |
615 | ret = __tx_port_find(vp, skb); | |
616 | spin_unlock_irqrestore(&vp->lock, flags); | |
617 | ||
618 | return ret; | |
619 | } | |
620 | ||
621 | static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
622 | { | |
623 | struct vnet *vp = netdev_priv(dev); | |
624 | struct vnet_port *port = tx_port_find(vp, skb); | |
625 | struct vio_dring_state *dr; | |
626 | struct vio_net_desc *d; | |
627 | unsigned long flags; | |
628 | unsigned int len; | |
629 | void *tx_buf; | |
630 | int i, err; | |
631 | ||
632 | if (unlikely(!port)) | |
633 | goto out_dropped; | |
634 | ||
635 | spin_lock_irqsave(&port->vio.lock, flags); | |
636 | ||
637 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
638 | if (unlikely(vnet_tx_dring_avail(dr) < 2)) { | |
639 | if (!netif_queue_stopped(dev)) { | |
640 | netif_stop_queue(dev); | |
641 | ||
642 | /* This is a hard error, log it. */ | |
643 | printk(KERN_ERR PFX "%s: BUG! Tx Ring full when " | |
644 | "queue awake!\n", dev->name); | |
645 | dev->stats.tx_errors++; | |
646 | } | |
647 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
648 | return NETDEV_TX_BUSY; | |
649 | } | |
650 | ||
651 | d = vio_dring_cur(dr); | |
652 | ||
653 | tx_buf = port->tx_bufs[dr->prod].buf; | |
654 | skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len); | |
655 | ||
656 | len = skb->len; | |
657 | if (len < ETH_ZLEN) { | |
658 | len = ETH_ZLEN; | |
659 | memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len); | |
660 | } | |
661 | ||
662 | d->hdr.ack = VIO_ACK_ENABLE; | |
663 | d->size = len; | |
664 | d->ncookies = port->tx_bufs[dr->prod].ncookies; | |
665 | for (i = 0; i < d->ncookies; i++) | |
666 | d->cookies[i] = port->tx_bufs[dr->prod].cookies[i]; | |
667 | ||
668 | /* This has to be a non-SMP write barrier because we are writing | |
669 | * to memory which is shared with the peer LDOM. | |
670 | */ | |
671 | wmb(); | |
672 | ||
673 | d->hdr.state = VIO_DESC_READY; | |
674 | ||
675 | err = __vnet_tx_trigger(port); | |
676 | if (unlikely(err < 0)) { | |
677 | printk(KERN_INFO PFX "%s: TX trigger error %d\n", | |
678 | dev->name, err); | |
679 | d->hdr.state = VIO_DESC_FREE; | |
680 | dev->stats.tx_carrier_errors++; | |
681 | goto out_dropped_unlock; | |
682 | } | |
683 | ||
684 | dev->stats.tx_packets++; | |
685 | dev->stats.tx_bytes += skb->len; | |
686 | ||
687 | dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); | |
688 | if (unlikely(vnet_tx_dring_avail(dr) < 2)) { | |
689 | netif_stop_queue(dev); | |
690 | if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) | |
691 | netif_wake_queue(dev); | |
692 | } | |
693 | ||
694 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
695 | ||
696 | dev_kfree_skb(skb); | |
697 | ||
698 | dev->trans_start = jiffies; | |
699 | return NETDEV_TX_OK; | |
700 | ||
701 | out_dropped_unlock: | |
702 | spin_unlock_irqrestore(&port->vio.lock, flags); | |
703 | ||
704 | out_dropped: | |
705 | dev_kfree_skb(skb); | |
706 | dev->stats.tx_dropped++; | |
707 | return NETDEV_TX_OK; | |
708 | } | |
709 | ||
710 | static void vnet_tx_timeout(struct net_device *dev) | |
711 | { | |
712 | /* XXX Implement me XXX */ | |
713 | } | |
714 | ||
715 | static int vnet_open(struct net_device *dev) | |
716 | { | |
717 | netif_carrier_on(dev); | |
718 | netif_start_queue(dev); | |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
723 | static int vnet_close(struct net_device *dev) | |
724 | { | |
725 | netif_stop_queue(dev); | |
726 | netif_carrier_off(dev); | |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
731 | static void vnet_set_rx_mode(struct net_device *dev) | |
732 | { | |
733 | /* XXX Implement multicast support XXX */ | |
734 | } | |
735 | ||
736 | static int vnet_change_mtu(struct net_device *dev, int new_mtu) | |
737 | { | |
738 | if (new_mtu != ETH_DATA_LEN) | |
739 | return -EINVAL; | |
740 | ||
741 | dev->mtu = new_mtu; | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static int vnet_set_mac_addr(struct net_device *dev, void *p) | |
746 | { | |
747 | return -EINVAL; | |
748 | } | |
749 | ||
750 | static void vnet_get_drvinfo(struct net_device *dev, | |
751 | struct ethtool_drvinfo *info) | |
752 | { | |
753 | strcpy(info->driver, DRV_MODULE_NAME); | |
754 | strcpy(info->version, DRV_MODULE_VERSION); | |
755 | } | |
756 | ||
757 | static u32 vnet_get_msglevel(struct net_device *dev) | |
758 | { | |
759 | struct vnet *vp = netdev_priv(dev); | |
760 | return vp->msg_enable; | |
761 | } | |
762 | ||
763 | static void vnet_set_msglevel(struct net_device *dev, u32 value) | |
764 | { | |
765 | struct vnet *vp = netdev_priv(dev); | |
766 | vp->msg_enable = value; | |
767 | } | |
768 | ||
769 | static const struct ethtool_ops vnet_ethtool_ops = { | |
770 | .get_drvinfo = vnet_get_drvinfo, | |
771 | .get_msglevel = vnet_get_msglevel, | |
772 | .set_msglevel = vnet_set_msglevel, | |
773 | .get_link = ethtool_op_get_link, | |
774 | .get_perm_addr = ethtool_op_get_perm_addr, | |
775 | }; | |
776 | ||
777 | static void vnet_port_free_tx_bufs(struct vnet_port *port) | |
778 | { | |
779 | struct vio_dring_state *dr; | |
780 | int i; | |
781 | ||
782 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
783 | if (dr->base) { | |
784 | ldc_free_exp_dring(port->vio.lp, dr->base, | |
785 | (dr->entry_size * dr->num_entries), | |
786 | dr->cookies, dr->ncookies); | |
787 | dr->base = NULL; | |
788 | dr->entry_size = 0; | |
789 | dr->num_entries = 0; | |
790 | dr->pending = 0; | |
791 | dr->ncookies = 0; | |
792 | } | |
793 | ||
794 | for (i = 0; i < VNET_TX_RING_SIZE; i++) { | |
795 | void *buf = port->tx_bufs[i].buf; | |
796 | ||
797 | if (!buf) | |
798 | continue; | |
799 | ||
800 | ldc_unmap(port->vio.lp, | |
801 | port->tx_bufs[i].cookies, | |
802 | port->tx_bufs[i].ncookies); | |
803 | ||
804 | kfree(buf); | |
805 | port->tx_bufs[i].buf = NULL; | |
806 | } | |
807 | } | |
808 | ||
809 | static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port) | |
810 | { | |
811 | struct vio_dring_state *dr; | |
812 | unsigned long len; | |
813 | int i, err, ncookies; | |
814 | void *dring; | |
815 | ||
816 | for (i = 0; i < VNET_TX_RING_SIZE; i++) { | |
817 | void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL); | |
818 | int map_len = (ETH_FRAME_LEN + 7) & ~7; | |
819 | ||
820 | err = -ENOMEM; | |
821 | if (!buf) { | |
822 | printk(KERN_ERR "TX buffer allocation failure\n"); | |
823 | goto err_out; | |
824 | } | |
825 | err = -EFAULT; | |
826 | if ((unsigned long)buf & (8UL - 1)) { | |
827 | printk(KERN_ERR "TX buffer misaligned\n"); | |
828 | kfree(buf); | |
829 | goto err_out; | |
830 | } | |
831 | ||
832 | err = ldc_map_single(port->vio.lp, buf, map_len, | |
833 | port->tx_bufs[i].cookies, 2, | |
834 | (LDC_MAP_SHADOW | | |
835 | LDC_MAP_DIRECT | | |
836 | LDC_MAP_RW)); | |
837 | if (err < 0) { | |
838 | kfree(buf); | |
839 | goto err_out; | |
840 | } | |
841 | port->tx_bufs[i].buf = buf; | |
842 | port->tx_bufs[i].ncookies = err; | |
843 | } | |
844 | ||
845 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; | |
846 | ||
847 | len = (VNET_TX_RING_SIZE * | |
848 | (sizeof(struct vio_net_desc) + | |
849 | (sizeof(struct ldc_trans_cookie) * 2))); | |
850 | ||
851 | ncookies = VIO_MAX_RING_COOKIES; | |
852 | dring = ldc_alloc_exp_dring(port->vio.lp, len, | |
853 | dr->cookies, &ncookies, | |
854 | (LDC_MAP_SHADOW | | |
855 | LDC_MAP_DIRECT | | |
856 | LDC_MAP_RW)); | |
857 | if (IS_ERR(dring)) { | |
858 | err = PTR_ERR(dring); | |
859 | goto err_out; | |
860 | } | |
861 | ||
862 | dr->base = dring; | |
863 | dr->entry_size = (sizeof(struct vio_net_desc) + | |
864 | (sizeof(struct ldc_trans_cookie) * 2)); | |
865 | dr->num_entries = VNET_TX_RING_SIZE; | |
866 | dr->prod = dr->cons = 0; | |
867 | dr->pending = VNET_TX_RING_SIZE; | |
868 | dr->ncookies = ncookies; | |
869 | ||
870 | return 0; | |
871 | ||
872 | err_out: | |
873 | vnet_port_free_tx_bufs(port); | |
874 | ||
875 | return err; | |
876 | } | |
877 | ||
878 | static struct ldc_channel_config vnet_ldc_cfg = { | |
879 | .event = vnet_event, | |
880 | .mtu = 64, | |
881 | .mode = LDC_MODE_UNRELIABLE, | |
882 | }; | |
883 | ||
884 | static struct vio_driver_ops vnet_vio_ops = { | |
885 | .send_attr = vnet_send_attr, | |
886 | .handle_attr = vnet_handle_attr, | |
887 | .handshake_complete = vnet_handshake_complete, | |
888 | }; | |
889 | ||
890 | const char *remote_macaddr_prop = "remote-mac-address"; | |
891 | ||
892 | static int __devinit vnet_port_probe(struct vio_dev *vdev, | |
893 | const struct vio_device_id *id) | |
894 | { | |
43fdf274 | 895 | struct mdesc_handle *hp; |
4c521e42 DM |
896 | struct vnet_port *port; |
897 | unsigned long flags; | |
898 | struct vnet *vp; | |
899 | const u64 *rmac; | |
900 | int len, i, err, switch_port; | |
901 | ||
902 | vp = dev_get_drvdata(vdev->dev.parent); | |
903 | if (!vp) { | |
904 | printk(KERN_ERR PFX "Cannot find port parent vnet.\n"); | |
905 | return -ENODEV; | |
906 | } | |
907 | ||
43fdf274 DM |
908 | hp = mdesc_grab(); |
909 | ||
910 | rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); | |
911 | err = -ENODEV; | |
4c521e42 DM |
912 | if (!rmac) { |
913 | printk(KERN_ERR PFX "Port lacks %s property.\n", | |
914 | remote_macaddr_prop); | |
43fdf274 | 915 | goto err_out_put_mdesc; |
4c521e42 DM |
916 | } |
917 | ||
918 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
43fdf274 | 919 | err = -ENOMEM; |
4c521e42 DM |
920 | if (!port) { |
921 | printk(KERN_ERR PFX "Cannot allocate vnet_port.\n"); | |
43fdf274 | 922 | goto err_out_put_mdesc; |
4c521e42 DM |
923 | } |
924 | ||
925 | for (i = 0; i < ETH_ALEN; i++) | |
926 | port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; | |
927 | ||
928 | port->vp = vp; | |
929 | ||
43fdf274 | 930 | err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, |
4c521e42 DM |
931 | vnet_versions, ARRAY_SIZE(vnet_versions), |
932 | &vnet_vio_ops, vp->dev->name); | |
933 | if (err) | |
934 | goto err_out_free_port; | |
935 | ||
936 | err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); | |
937 | if (err) | |
938 | goto err_out_free_port; | |
939 | ||
940 | err = vnet_port_alloc_tx_bufs(port); | |
941 | if (err) | |
942 | goto err_out_free_ldc; | |
943 | ||
944 | INIT_HLIST_NODE(&port->hash); | |
945 | INIT_LIST_HEAD(&port->list); | |
946 | ||
947 | switch_port = 0; | |
43fdf274 | 948 | if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) |
4c521e42 DM |
949 | switch_port = 1; |
950 | ||
951 | spin_lock_irqsave(&vp->lock, flags); | |
952 | if (switch_port) | |
953 | list_add(&port->list, &vp->port_list); | |
954 | else | |
955 | list_add_tail(&port->list, &vp->port_list); | |
956 | hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]); | |
957 | spin_unlock_irqrestore(&vp->lock, flags); | |
958 | ||
959 | dev_set_drvdata(&vdev->dev, port); | |
960 | ||
961 | printk(KERN_INFO "%s: PORT ( remote-mac ", vp->dev->name); | |
962 | for (i = 0; i < 6; i++) | |
963 | printk("%2.2x%c", port->raddr[i], i == 5 ? ' ' : ':'); | |
964 | if (switch_port) | |
965 | printk("switch-port "); | |
966 | printk(")\n"); | |
967 | ||
968 | vio_port_up(&port->vio); | |
969 | ||
43fdf274 DM |
970 | mdesc_release(hp); |
971 | ||
4c521e42 DM |
972 | return 0; |
973 | ||
974 | err_out_free_ldc: | |
975 | vio_ldc_free(&port->vio); | |
976 | ||
977 | err_out_free_port: | |
978 | kfree(port); | |
979 | ||
43fdf274 DM |
980 | err_out_put_mdesc: |
981 | mdesc_release(hp); | |
4c521e42 DM |
982 | return err; |
983 | } | |
984 | ||
985 | static int vnet_port_remove(struct vio_dev *vdev) | |
986 | { | |
987 | struct vnet_port *port = dev_get_drvdata(&vdev->dev); | |
988 | ||
989 | if (port) { | |
990 | struct vnet *vp = port->vp; | |
991 | unsigned long flags; | |
992 | ||
993 | del_timer_sync(&port->vio.timer); | |
994 | ||
995 | spin_lock_irqsave(&vp->lock, flags); | |
996 | list_del(&port->list); | |
997 | hlist_del(&port->hash); | |
998 | spin_unlock_irqrestore(&vp->lock, flags); | |
999 | ||
1000 | vnet_port_free_tx_bufs(port); | |
1001 | vio_ldc_free(&port->vio); | |
1002 | ||
1003 | dev_set_drvdata(&vdev->dev, NULL); | |
1004 | ||
1005 | kfree(port); | |
1006 | } | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static struct vio_device_id vnet_port_match[] = { | |
1011 | { | |
1012 | .type = "vnet-port", | |
1013 | }, | |
1014 | {}, | |
1015 | }; | |
1016 | MODULE_DEVICE_TABLE(vio, vnet_match); | |
1017 | ||
1018 | static struct vio_driver vnet_port_driver = { | |
1019 | .id_table = vnet_port_match, | |
1020 | .probe = vnet_port_probe, | |
1021 | .remove = vnet_port_remove, | |
1022 | .driver = { | |
1023 | .name = "vnet_port", | |
1024 | .owner = THIS_MODULE, | |
1025 | } | |
1026 | }; | |
1027 | ||
1028 | const char *local_mac_prop = "local-mac-address"; | |
1029 | ||
1030 | static int __devinit vnet_probe(struct vio_dev *vdev, | |
1031 | const struct vio_device_id *id) | |
1032 | { | |
1033 | static int vnet_version_printed; | |
43fdf274 | 1034 | struct mdesc_handle *hp; |
4c521e42 DM |
1035 | struct net_device *dev; |
1036 | struct vnet *vp; | |
1037 | const u64 *mac; | |
1038 | int err, i, len; | |
1039 | ||
1040 | if (vnet_version_printed++ == 0) | |
1041 | printk(KERN_INFO "%s", version); | |
1042 | ||
43fdf274 DM |
1043 | hp = mdesc_grab(); |
1044 | ||
1045 | mac = mdesc_get_property(hp, vdev->mp, local_mac_prop, &len); | |
4c521e42 DM |
1046 | if (!mac) { |
1047 | printk(KERN_ERR PFX "vnet lacks %s property.\n", | |
1048 | local_mac_prop); | |
1049 | err = -ENODEV; | |
1050 | goto err_out; | |
1051 | } | |
1052 | ||
1053 | dev = alloc_etherdev(sizeof(*vp)); | |
1054 | if (!dev) { | |
1055 | printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n"); | |
1056 | err = -ENOMEM; | |
1057 | goto err_out; | |
1058 | } | |
1059 | ||
1060 | for (i = 0; i < ETH_ALEN; i++) | |
1061 | dev->dev_addr[i] = (*mac >> (5 - i) * 8) & 0xff; | |
1062 | ||
1063 | memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); | |
1064 | ||
1065 | SET_NETDEV_DEV(dev, &vdev->dev); | |
1066 | ||
1067 | vp = netdev_priv(dev); | |
1068 | ||
1069 | spin_lock_init(&vp->lock); | |
1070 | vp->dev = dev; | |
1071 | vp->vdev = vdev; | |
1072 | ||
1073 | INIT_LIST_HEAD(&vp->port_list); | |
1074 | for (i = 0; i < VNET_PORT_HASH_SIZE; i++) | |
1075 | INIT_HLIST_HEAD(&vp->port_hash[i]); | |
1076 | ||
1077 | dev->open = vnet_open; | |
1078 | dev->stop = vnet_close; | |
1079 | dev->set_multicast_list = vnet_set_rx_mode; | |
1080 | dev->set_mac_address = vnet_set_mac_addr; | |
1081 | dev->tx_timeout = vnet_tx_timeout; | |
1082 | dev->ethtool_ops = &vnet_ethtool_ops; | |
1083 | dev->watchdog_timeo = VNET_TX_TIMEOUT; | |
1084 | dev->change_mtu = vnet_change_mtu; | |
1085 | dev->hard_start_xmit = vnet_start_xmit; | |
1086 | ||
1087 | err = register_netdev(dev); | |
1088 | if (err) { | |
1089 | printk(KERN_ERR PFX "Cannot register net device, " | |
1090 | "aborting.\n"); | |
1091 | goto err_out_free_dev; | |
1092 | } | |
1093 | ||
1094 | printk(KERN_INFO "%s: Sun LDOM vnet ", dev->name); | |
1095 | ||
1096 | for (i = 0; i < 6; i++) | |
1097 | printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':'); | |
1098 | ||
1099 | dev_set_drvdata(&vdev->dev, vp); | |
1100 | ||
43fdf274 DM |
1101 | mdesc_release(hp); |
1102 | ||
4c521e42 DM |
1103 | return 0; |
1104 | ||
1105 | err_out_free_dev: | |
1106 | free_netdev(dev); | |
1107 | ||
1108 | err_out: | |
43fdf274 | 1109 | mdesc_release(hp); |
4c521e42 DM |
1110 | return err; |
1111 | } | |
1112 | ||
1113 | static int vnet_remove(struct vio_dev *vdev) | |
1114 | { | |
1115 | ||
1116 | struct vnet *vp = dev_get_drvdata(&vdev->dev); | |
1117 | ||
1118 | if (vp) { | |
1119 | /* XXX unregister port, or at least check XXX */ | |
1120 | unregister_netdevice(vp->dev); | |
1121 | dev_set_drvdata(&vdev->dev, NULL); | |
1122 | } | |
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | static struct vio_device_id vnet_match[] = { | |
1127 | { | |
1128 | .type = "network", | |
1129 | }, | |
1130 | {}, | |
1131 | }; | |
1132 | MODULE_DEVICE_TABLE(vio, vnet_match); | |
1133 | ||
1134 | static struct vio_driver vnet_driver = { | |
1135 | .id_table = vnet_match, | |
1136 | .probe = vnet_probe, | |
1137 | .remove = vnet_remove, | |
1138 | .driver = { | |
1139 | .name = "vnet", | |
1140 | .owner = THIS_MODULE, | |
1141 | } | |
1142 | }; | |
1143 | ||
1144 | static int __init vnet_init(void) | |
1145 | { | |
1146 | int err = vio_register_driver(&vnet_driver); | |
1147 | ||
1148 | if (!err) { | |
1149 | err = vio_register_driver(&vnet_port_driver); | |
1150 | if (err) | |
1151 | vio_unregister_driver(&vnet_driver); | |
1152 | } | |
1153 | ||
1154 | return err; | |
1155 | } | |
1156 | ||
1157 | static void __exit vnet_exit(void) | |
1158 | { | |
1159 | vio_unregister_driver(&vnet_port_driver); | |
1160 | vio_unregister_driver(&vnet_driver); | |
1161 | } | |
1162 | ||
1163 | module_init(vnet_init); | |
1164 | module_exit(vnet_exit); |