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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / net / sunvnet.c
blobda43d7bf827ef382ec1426a5a7f954002954b648
1 /* sunvnet.c: Sun LDOM Virtual Network Driver.
2 *
3 * Copyright (C) 2007, 2008 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 #include <linux/mutex.h>
16
17 #include <asm/vio.h>
18 #include <asm/ldc.h>
19
20 #include "sunvnet.h"
21
22 #define DRV_MODULE_NAME "sunvnet"
23 #define PFX DRV_MODULE_NAME ": "
24 #define DRV_MODULE_VERSION "1.0"
25 #define DRV_MODULE_RELDATE "June 25, 2007"
26
27 static char version[] __devinitdata =
28 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
29 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
30 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
31 MODULE_LICENSE("GPL");
32 MODULE_VERSION(DRV_MODULE_VERSION);
33
34 /* Ordered from largest major to lowest */
35 static struct vio_version vnet_versions[] = {
36 { .major = 1, .minor = 0 },
37 };
38
39 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
40 {
41 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
42 }
43
44 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
45 {
46 struct vio_msg_tag *pkt = arg;
47
48 printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
49 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
50 printk(KERN_ERR PFX "Resetting connection.\n");
51
52 ldc_disconnect(port->vio.lp);
53
54 return -ECONNRESET;
55 }
56
57 static int vnet_send_attr(struct vio_driver_state *vio)
58 {
59 struct vnet_port *port = to_vnet_port(vio);
60 struct net_device *dev = port->vp->dev;
61 struct vio_net_attr_info pkt;
62 int i;
63
64 memset(&pkt, 0, sizeof(pkt));
65 pkt.tag.type = VIO_TYPE_CTRL;
66 pkt.tag.stype = VIO_SUBTYPE_INFO;
67 pkt.tag.stype_env = VIO_ATTR_INFO;
68 pkt.tag.sid = vio_send_sid(vio);
69 pkt.xfer_mode = VIO_DRING_MODE;
70 pkt.addr_type = VNET_ADDR_ETHERMAC;
71 pkt.ack_freq = 0;
72 for (i = 0; i < 6; i++)
73 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
74 pkt.mtu = ETH_FRAME_LEN;
75
76 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
77 "ackfreq[%u] mtu[%llu]\n",
78 pkt.xfer_mode, pkt.addr_type,
79 (unsigned long long) pkt.addr,
80 pkt.ack_freq,
81 (unsigned long long) pkt.mtu);
82
83 return vio_ldc_send(vio, &pkt, sizeof(pkt));
84 }
85
86 static int handle_attr_info(struct vio_driver_state *vio,
87 struct vio_net_attr_info *pkt)
88 {
89 viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
90 "ackfreq[%u] mtu[%llu]\n",
91 pkt->xfer_mode, pkt->addr_type,
92 (unsigned long long) pkt->addr,
93 pkt->ack_freq,
94 (unsigned long long) pkt->mtu);
95
96 pkt->tag.sid = vio_send_sid(vio);
97
98 if (pkt->xfer_mode != VIO_DRING_MODE ||
99 pkt->addr_type != VNET_ADDR_ETHERMAC ||
100 pkt->mtu != ETH_FRAME_LEN) {
101 viodbg(HS, "SEND NET ATTR NACK\n");
102
103 pkt->tag.stype = VIO_SUBTYPE_NACK;
104
105 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
106
107 return -ECONNRESET;
108 } else {
109 viodbg(HS, "SEND NET ATTR ACK\n");
110
111 pkt->tag.stype = VIO_SUBTYPE_ACK;
112
113 return vio_ldc_send(vio, pkt, sizeof(*pkt));
114 }
115
116 }
117
118 static int handle_attr_ack(struct vio_driver_state *vio,
119 struct vio_net_attr_info *pkt)
120 {
121 viodbg(HS, "GOT NET ATTR ACK\n");
122
123 return 0;
124 }
125
126 static int handle_attr_nack(struct vio_driver_state *vio,
127 struct vio_net_attr_info *pkt)
128 {
129 viodbg(HS, "GOT NET ATTR NACK\n");
130
131 return -ECONNRESET;
132 }
133
134 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
135 {
136 struct vio_net_attr_info *pkt = arg;
137
138 switch (pkt->tag.stype) {
139 case VIO_SUBTYPE_INFO:
140 return handle_attr_info(vio, pkt);
141
142 case VIO_SUBTYPE_ACK:
143 return handle_attr_ack(vio, pkt);
144
145 case VIO_SUBTYPE_NACK:
146 return handle_attr_nack(vio, pkt);
147
148 default:
149 return -ECONNRESET;
150 }
151 }
152
153 static void vnet_handshake_complete(struct vio_driver_state *vio)
154 {
155 struct vio_dring_state *dr;
156
157 dr = &vio->drings[VIO_DRIVER_RX_RING];
158 dr->snd_nxt = dr->rcv_nxt = 1;
159
160 dr = &vio->drings[VIO_DRIVER_TX_RING];
161 dr->snd_nxt = dr->rcv_nxt = 1;
162 }
163
164 /* The hypervisor interface that implements copying to/from imported
165 * memory from another domain requires that copies are done to 8-byte
166 * aligned buffers, and that the lengths of such copies are also 8-byte
167 * multiples.
168 *
169 * So we align skb->data to an 8-byte multiple and pad-out the data
170 * area so we can round the copy length up to the next multiple of
171 * 8 for the copy.
172 *
173 * The transmitter puts the actual start of the packet 6 bytes into
174 * the buffer it sends over, so that the IP headers after the ethernet
175 * header are aligned properly. These 6 bytes are not in the descriptor
176 * length, they are simply implied. This offset is represented using
177 * the VNET_PACKET_SKIP macro.
178 */
179 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
180 unsigned int len)
181 {
182 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
183 unsigned long addr, off;
184
185 if (unlikely(!skb))
186 return NULL;
187
188 addr = (unsigned long) skb->data;
189 off = ((addr + 7UL) & ~7UL) - addr;
190 if (off)
191 skb_reserve(skb, off);
192
193 return skb;
194 }
195
196 static int vnet_rx_one(struct vnet_port *port, unsigned int len,
197 struct ldc_trans_cookie *cookies, int ncookies)
198 {
199 struct net_device *dev = port->vp->dev;
200 unsigned int copy_len;
201 struct sk_buff *skb;
202 int err;
203
204 err = -EMSGSIZE;
205 if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
206 dev->stats.rx_length_errors++;
207 goto out_dropped;
208 }
209
210 skb = alloc_and_align_skb(dev, len);
211 err = -ENOMEM;
212 if (unlikely(!skb)) {
213 dev->stats.rx_missed_errors++;
214 goto out_dropped;
215 }
216
217 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
218 skb_put(skb, copy_len);
219 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
220 skb->data, copy_len, 0,
221 cookies, ncookies);
222 if (unlikely(err < 0)) {
223 dev->stats.rx_frame_errors++;
224 goto out_free_skb;
225 }
226
227 skb_pull(skb, VNET_PACKET_SKIP);
228 skb_trim(skb, len);
229 skb->protocol = eth_type_trans(skb, dev);
230
231 dev->stats.rx_packets++;
232 dev->stats.rx_bytes += len;
233
234 netif_rx(skb);
235
236 return 0;
237
238 out_free_skb:
239 kfree_skb(skb);
240
241 out_dropped:
242 dev->stats.rx_dropped++;
243 return err;
244 }
245
246 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
247 u32 start, u32 end, u8 vio_dring_state)
248 {
249 struct vio_dring_data hdr = {
250 .tag = {
251 .type = VIO_TYPE_DATA,
252 .stype = VIO_SUBTYPE_ACK,
253 .stype_env = VIO_DRING_DATA,
254 .sid = vio_send_sid(&port->vio),
255 },
256 .dring_ident = dr->ident,
257 .start_idx = start,
258 .end_idx = end,
259 .state = vio_dring_state,
260 };
261 int err, delay;
262
263 hdr.seq = dr->snd_nxt;
264 delay = 1;
265 do {
266 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
267 if (err > 0) {
268 dr->snd_nxt++;
269 break;
270 }
271 udelay(delay);
272 if ((delay <<= 1) > 128)
273 delay = 128;
274 } while (err == -EAGAIN);
275
276 return err;
277 }
278
279 static u32 next_idx(u32 idx, struct vio_dring_state *dr)
280 {
281 if (++idx == dr->num_entries)
282 idx = 0;
283 return idx;
284 }
285
286 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
287 {
288 if (idx == 0)
289 idx = dr->num_entries - 1;
290 else
291 idx--;
292
293 return idx;
294 }
295
296 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
297 struct vio_dring_state *dr,
298 u32 index)
299 {
300 struct vio_net_desc *desc = port->vio.desc_buf;
301 int err;
302
303 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
304 (index * dr->entry_size),
305 dr->cookies, dr->ncookies);
306 if (err < 0)
307 return ERR_PTR(err);
308
309 return desc;
310 }
311
312 static int put_rx_desc(struct vnet_port *port,
313 struct vio_dring_state *dr,
314 struct vio_net_desc *desc,
315 u32 index)
316 {
317 int err;
318
319 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
320 (index * dr->entry_size),
321 dr->cookies, dr->ncookies);
322 if (err < 0)
323 return err;
324
325 return 0;
326 }
327
328 static int vnet_walk_rx_one(struct vnet_port *port,
329 struct vio_dring_state *dr,
330 u32 index, int *needs_ack)
331 {
332 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
333 struct vio_driver_state *vio = &port->vio;
334 int err;
335
336 if (IS_ERR(desc))
337 return PTR_ERR(desc);
338
339 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
340 desc->hdr.state, desc->hdr.ack,
341 desc->size, desc->ncookies,
342 desc->cookies[0].cookie_addr,
343 desc->cookies[0].cookie_size);
344
345 if (desc->hdr.state != VIO_DESC_READY)
346 return 1;
347 err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
348 if (err == -ECONNRESET)
349 return err;
350 desc->hdr.state = VIO_DESC_DONE;
351 err = put_rx_desc(port, dr, desc, index);
352 if (err < 0)
353 return err;
354 *needs_ack = desc->hdr.ack;
355 return 0;
356 }
357
358 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
359 u32 start, u32 end)
360 {
361 struct vio_driver_state *vio = &port->vio;
362 int ack_start = -1, ack_end = -1;
363
364 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
365
366 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
367
368 while (start != end) {
369 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
370 if (err == -ECONNRESET)
371 return err;
372 if (err != 0)
373 break;
374 if (ack_start == -1)
375 ack_start = start;
376 ack_end = start;
377 start = next_idx(start, dr);
378 if (ack && start != end) {
379 err = vnet_send_ack(port, dr, ack_start, ack_end,
380 VIO_DRING_ACTIVE);
381 if (err == -ECONNRESET)
382 return err;
383 ack_start = -1;
384 }
385 }
386 if (unlikely(ack_start == -1))
387 ack_start = ack_end = prev_idx(start, dr);
388 return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
389 }
390
391 static int vnet_rx(struct vnet_port *port, void *msgbuf)
392 {
393 struct vio_dring_data *pkt = msgbuf;
394 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
395 struct vio_driver_state *vio = &port->vio;
396
397 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
398 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
399
400 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
401 return 0;
402 if (unlikely(pkt->seq != dr->rcv_nxt)) {
403 printk(KERN_ERR PFX "RX out of sequence seq[0x%llx] "
404 "rcv_nxt[0x%llx]\n", pkt->seq, dr->rcv_nxt);
405 return 0;
406 }
407
408 dr->rcv_nxt++;
409
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 return 0;
458 }
459
460 static int handle_mcast(struct vnet_port *port, void *msgbuf)
461 {
462 struct vio_net_mcast_info *pkt = msgbuf;
463
464 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
465 printk(KERN_ERR PFX "%s: Got unexpected MCAST reply "
466 "[%02x:%02x:%04x:%08x]\n",
467 port->vp->dev->name,
468 pkt->tag.type,
469 pkt->tag.stype,
470 pkt->tag.stype_env,
471 pkt->tag.sid);
472
473 return 0;
474 }
475
476 static void maybe_tx_wakeup(struct vnet *vp)
477 {
478 struct net_device *dev = vp->dev;
479
480 netif_tx_lock(dev);
481 if (likely(netif_queue_stopped(dev))) {
482 struct vnet_port *port;
483 int wake = 1;
484
485 list_for_each_entry(port, &vp->port_list, list) {
486 struct vio_dring_state *dr;
487
488 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
489 if (vnet_tx_dring_avail(dr) <
490 VNET_TX_WAKEUP_THRESH(dr)) {
491 wake = 0;
492 break;
493 }
494 }
495 if (wake)
496 netif_wake_queue(dev);
497 }
498 netif_tx_unlock(dev);
499 }
500
501 static void vnet_event(void *arg, int event)
502 {
503 struct vnet_port *port = arg;
504 struct vio_driver_state *vio = &port->vio;
505 unsigned long flags;
506 int tx_wakeup, err;
507
508 spin_lock_irqsave(&vio->lock, flags);
509
510 if (unlikely(event == LDC_EVENT_RESET ||
511 event == LDC_EVENT_UP)) {
512 vio_link_state_change(vio, event);
513 spin_unlock_irqrestore(&vio->lock, flags);
514
515 if (event == LDC_EVENT_RESET)
516 vio_port_up(vio);
517 return;
518 }
519
520 if (unlikely(event != LDC_EVENT_DATA_READY)) {
521 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
522 spin_unlock_irqrestore(&vio->lock, flags);
523 return;
524 }
525
526 tx_wakeup = err = 0;
527 while (1) {
528 union {
529 struct vio_msg_tag tag;
530 u64 raw[8];
531 } msgbuf;
532
533 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
534 if (unlikely(err < 0)) {
535 if (err == -ECONNRESET)
536 vio_conn_reset(vio);
537 break;
538 }
539 if (err == 0)
540 break;
541 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
542 msgbuf.tag.type,
543 msgbuf.tag.stype,
544 msgbuf.tag.stype_env,
545 msgbuf.tag.sid);
546 err = vio_validate_sid(vio, &msgbuf.tag);
547 if (err < 0)
548 break;
549
550 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
551 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
552 err = vnet_rx(port, &msgbuf);
553 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
554 err = vnet_ack(port, &msgbuf);
555 if (err > 0)
556 tx_wakeup |= err;
557 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
558 err = vnet_nack(port, &msgbuf);
559 }
560 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
561 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
562 err = handle_mcast(port, &msgbuf);
563 else
564 err = vio_control_pkt_engine(vio, &msgbuf);
565 if (err)
566 break;
567 } else {
568 err = vnet_handle_unknown(port, &msgbuf);
569 }
570 if (err == -ECONNRESET)
571 break;
572 }
573 spin_unlock(&vio->lock);
574 if (unlikely(tx_wakeup && err != -ECONNRESET))
575 maybe_tx_wakeup(port->vp);
576 local_irq_restore(flags);
577 }
578
579 static int __vnet_tx_trigger(struct vnet_port *port)
580 {
581 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
582 struct vio_dring_data hdr = {
583 .tag = {
584 .type = VIO_TYPE_DATA,
585 .stype = VIO_SUBTYPE_INFO,
586 .stype_env = VIO_DRING_DATA,
587 .sid = vio_send_sid(&port->vio),
588 },
589 .dring_ident = dr->ident,
590 .start_idx = dr->prod,
591 .end_idx = (u32) -1,
592 };
593 int err, delay;
594
595 hdr.seq = dr->snd_nxt;
596 delay = 1;
597 do {
598 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
599 if (err > 0) {
600 dr->snd_nxt++;
601 break;
602 }
603 udelay(delay);
604 if ((delay <<= 1) > 128)
605 delay = 128;
606 } while (err == -EAGAIN);
607
608 return err;
609 }
610
611 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
612 {
613 unsigned int hash = vnet_hashfn(skb->data);
614 struct hlist_head *hp = &vp->port_hash[hash];
615 struct hlist_node *n;
616 struct vnet_port *port;
617
618 hlist_for_each_entry(port, n, hp, hash) {
619 if (!compare_ether_addr(port->raddr, skb->data))
620 return port;
621 }
622 port = NULL;
623 if (!list_empty(&vp->port_list))
624 port = list_entry(vp->port_list.next, struct vnet_port, list);
625
626 return port;
627 }
628
629 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
630 {
631 struct vnet_port *ret;
632 unsigned long flags;
633
634 spin_lock_irqsave(&vp->lock, flags);
635 ret = __tx_port_find(vp, skb);
636 spin_unlock_irqrestore(&vp->lock, flags);
637
638 return ret;
639 }
640
641 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
642 {
643 struct vnet *vp = netdev_priv(dev);
644 struct vnet_port *port = tx_port_find(vp, skb);
645 struct vio_dring_state *dr;
646 struct vio_net_desc *d;
647 unsigned long flags;
648 unsigned int len;
649 void *tx_buf;
650 int i, err;
651
652 if (unlikely(!port))
653 goto out_dropped;
654
655 spin_lock_irqsave(&port->vio.lock, flags);
656
657 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
658 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
659 if (!netif_queue_stopped(dev)) {
660 netif_stop_queue(dev);
661
662 /* This is a hard error, log it. */
663 printk(KERN_ERR PFX "%s: BUG! Tx Ring full when "
664 "queue awake!\n", dev->name);
665 dev->stats.tx_errors++;
666 }
667 spin_unlock_irqrestore(&port->vio.lock, flags);
668 return NETDEV_TX_BUSY;
669 }
670
671 d = vio_dring_cur(dr);
672
673 tx_buf = port->tx_bufs[dr->prod].buf;
674 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
675
676 len = skb->len;
677 if (len < ETH_ZLEN) {
678 len = ETH_ZLEN;
679 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
680 }
681
682 d->hdr.ack = VIO_ACK_ENABLE;
683 d->size = len;
684 d->ncookies = port->tx_bufs[dr->prod].ncookies;
685 for (i = 0; i < d->ncookies; i++)
686 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
687
688 /* This has to be a non-SMP write barrier because we are writing
689 * to memory which is shared with the peer LDOM.
690 */
691 wmb();
692
693 d->hdr.state = VIO_DESC_READY;
694
695 err = __vnet_tx_trigger(port);
696 if (unlikely(err < 0)) {
697 printk(KERN_INFO PFX "%s: TX trigger error %d\n",
698 dev->name, err);
699 d->hdr.state = VIO_DESC_FREE;
700 dev->stats.tx_carrier_errors++;
701 goto out_dropped_unlock;
702 }
703
704 dev->stats.tx_packets++;
705 dev->stats.tx_bytes += skb->len;
706
707 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
708 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
709 netif_stop_queue(dev);
710 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
711 netif_wake_queue(dev);
712 }
713
714 spin_unlock_irqrestore(&port->vio.lock, flags);
715
716 dev_kfree_skb(skb);
717
718 return NETDEV_TX_OK;
719
720 out_dropped_unlock:
721 spin_unlock_irqrestore(&port->vio.lock, flags);
722
723 out_dropped:
724 dev_kfree_skb(skb);
725 dev->stats.tx_dropped++;
726 return NETDEV_TX_OK;
727 }
728
729 static void vnet_tx_timeout(struct net_device *dev)
730 {
731 }
732
733 static int vnet_open(struct net_device *dev)
734 {
735 netif_carrier_on(dev);
736 netif_start_queue(dev);
737
738 return 0;
739 }
740
741 static int vnet_close(struct net_device *dev)
742 {
743 netif_stop_queue(dev);
744 netif_carrier_off(dev);
745
746 return 0;
747 }
748
749 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
750 {
751 struct vnet_mcast_entry *m;
752
753 for (m = vp->mcast_list; m; m = m->next) {
754 if (!memcmp(m->addr, addr, ETH_ALEN))
755 return m;
756 }
757 return NULL;
758 }
759
760 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
761 {
762 struct netdev_hw_addr *ha;
763
764 netdev_for_each_mc_addr(ha, dev) {
765 struct vnet_mcast_entry *m;
766
767 m = __vnet_mc_find(vp, ha->addr);
768 if (m) {
769 m->hit = 1;
770 continue;
771 }
772
773 if (!m) {
774 m = kzalloc(sizeof(*m), GFP_ATOMIC);
775 if (!m)
776 continue;
777 memcpy(m->addr, ha->addr, ETH_ALEN);
778 m->hit = 1;
779
780 m->next = vp->mcast_list;
781 vp->mcast_list = m;
782 }
783 }
784 }
785
786 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
787 {
788 struct vio_net_mcast_info info;
789 struct vnet_mcast_entry *m, **pp;
790 int n_addrs;
791
792 memset(&info, 0, sizeof(info));
793
794 info.tag.type = VIO_TYPE_CTRL;
795 info.tag.stype = VIO_SUBTYPE_INFO;
796 info.tag.stype_env = VNET_MCAST_INFO;
797 info.tag.sid = vio_send_sid(&port->vio);
798 info.set = 1;
799
800 n_addrs = 0;
801 for (m = vp->mcast_list; m; m = m->next) {
802 if (m->sent)
803 continue;
804 m->sent = 1;
805 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
806 m->addr, ETH_ALEN);
807 if (++n_addrs == VNET_NUM_MCAST) {
808 info.count = n_addrs;
809
810 (void) vio_ldc_send(&port->vio, &info,
811 sizeof(info));
812 n_addrs = 0;
813 }
814 }
815 if (n_addrs) {
816 info.count = n_addrs;
817 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
818 }
819
820 info.set = 0;
821
822 n_addrs = 0;
823 pp = &vp->mcast_list;
824 while ((m = *pp) != NULL) {
825 if (m->hit) {
826 m->hit = 0;
827 pp = &m->next;
828 continue;
829 }
830
831 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
832 m->addr, ETH_ALEN);
833 if (++n_addrs == VNET_NUM_MCAST) {
834 info.count = n_addrs;
835 (void) vio_ldc_send(&port->vio, &info,
836 sizeof(info));
837 n_addrs = 0;
838 }
839
840 *pp = m->next;
841 kfree(m);
842 }
843 if (n_addrs) {
844 info.count = n_addrs;
845 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
846 }
847 }
848
849 static void vnet_set_rx_mode(struct net_device *dev)
850 {
851 struct vnet *vp = netdev_priv(dev);
852 struct vnet_port *port;
853 unsigned long flags;
854
855 spin_lock_irqsave(&vp->lock, flags);
856 if (!list_empty(&vp->port_list)) {
857 port = list_entry(vp->port_list.next, struct vnet_port, list);
858
859 if (port->switch_port) {
860 __update_mc_list(vp, dev);
861 __send_mc_list(vp, port);
862 }
863 }
864 spin_unlock_irqrestore(&vp->lock, flags);
865 }
866
867 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
868 {
869 if (new_mtu != ETH_DATA_LEN)
870 return -EINVAL;
871
872 dev->mtu = new_mtu;
873 return 0;
874 }
875
876 static int vnet_set_mac_addr(struct net_device *dev, void *p)
877 {
878 return -EINVAL;
879 }
880
881 static void vnet_get_drvinfo(struct net_device *dev,
882 struct ethtool_drvinfo *info)
883 {
884 strcpy(info->driver, DRV_MODULE_NAME);
885 strcpy(info->version, DRV_MODULE_VERSION);
886 }
887
888 static u32 vnet_get_msglevel(struct net_device *dev)
889 {
890 struct vnet *vp = netdev_priv(dev);
891 return vp->msg_enable;
892 }
893
894 static void vnet_set_msglevel(struct net_device *dev, u32 value)
895 {
896 struct vnet *vp = netdev_priv(dev);
897 vp->msg_enable = value;
898 }
899
900 static const struct ethtool_ops vnet_ethtool_ops = {
901 .get_drvinfo = vnet_get_drvinfo,
902 .get_msglevel = vnet_get_msglevel,
903 .set_msglevel = vnet_set_msglevel,
904 .get_link = ethtool_op_get_link,
905 };
906
907 static void vnet_port_free_tx_bufs(struct vnet_port *port)
908 {
909 struct vio_dring_state *dr;
910 int i;
911
912 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
913 if (dr->base) {
914 ldc_free_exp_dring(port->vio.lp, dr->base,
915 (dr->entry_size * dr->num_entries),
916 dr->cookies, dr->ncookies);
917 dr->base = NULL;
918 dr->entry_size = 0;
919 dr->num_entries = 0;
920 dr->pending = 0;
921 dr->ncookies = 0;
922 }
923
924 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
925 void *buf = port->tx_bufs[i].buf;
926
927 if (!buf)
928 continue;
929
930 ldc_unmap(port->vio.lp,
931 port->tx_bufs[i].cookies,
932 port->tx_bufs[i].ncookies);
933
934 kfree(buf);
935 port->tx_bufs[i].buf = NULL;
936 }
937 }
938
939 static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
940 {
941 struct vio_dring_state *dr;
942 unsigned long len;
943 int i, err, ncookies;
944 void *dring;
945
946 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
947 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
948 int map_len = (ETH_FRAME_LEN + 7) & ~7;
949
950 err = -ENOMEM;
951 if (!buf) {
952 printk(KERN_ERR "TX buffer allocation failure\n");
953 goto err_out;
954 }
955 err = -EFAULT;
956 if ((unsigned long)buf & (8UL - 1)) {
957 printk(KERN_ERR "TX buffer misaligned\n");
958 kfree(buf);
959 goto err_out;
960 }
961
962 err = ldc_map_single(port->vio.lp, buf, map_len,
963 port->tx_bufs[i].cookies, 2,
964 (LDC_MAP_SHADOW |
965 LDC_MAP_DIRECT |
966 LDC_MAP_RW));
967 if (err < 0) {
968 kfree(buf);
969 goto err_out;
970 }
971 port->tx_bufs[i].buf = buf;
972 port->tx_bufs[i].ncookies = err;
973 }
974
975 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
976
977 len = (VNET_TX_RING_SIZE *
978 (sizeof(struct vio_net_desc) +
979 (sizeof(struct ldc_trans_cookie) * 2)));
980
981 ncookies = VIO_MAX_RING_COOKIES;
982 dring = ldc_alloc_exp_dring(port->vio.lp, len,
983 dr->cookies, &ncookies,
984 (LDC_MAP_SHADOW |
985 LDC_MAP_DIRECT |
986 LDC_MAP_RW));
987 if (IS_ERR(dring)) {
988 err = PTR_ERR(dring);
989 goto err_out;
990 }
991
992 dr->base = dring;
993 dr->entry_size = (sizeof(struct vio_net_desc) +
994 (sizeof(struct ldc_trans_cookie) * 2));
995 dr->num_entries = VNET_TX_RING_SIZE;
996 dr->prod = dr->cons = 0;
997 dr->pending = VNET_TX_RING_SIZE;
998 dr->ncookies = ncookies;
999
1000 return 0;
1001
1002 err_out:
1003 vnet_port_free_tx_bufs(port);
1004
1005 return err;
1006 }
1007
1008 static LIST_HEAD(vnet_list);
1009 static DEFINE_MUTEX(vnet_list_mutex);
1010
1011 static const struct net_device_ops vnet_ops = {
1012 .ndo_open = vnet_open,
1013 .ndo_stop = vnet_close,
1014 .ndo_set_multicast_list = vnet_set_rx_mode,
1015 .ndo_set_mac_address = vnet_set_mac_addr,
1016 .ndo_validate_addr = eth_validate_addr,
1017 .ndo_tx_timeout = vnet_tx_timeout,
1018 .ndo_change_mtu = vnet_change_mtu,
1019 .ndo_start_xmit = vnet_start_xmit,
1020 };
1021
1022 static struct vnet * __devinit vnet_new(const u64 *local_mac)
1023 {
1024 struct net_device *dev;
1025 struct vnet *vp;
1026 int err, i;
1027
1028 dev = alloc_etherdev(sizeof(*vp));
1029 if (!dev) {
1030 printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
1031 return ERR_PTR(-ENOMEM);
1032 }
1033
1034 for (i = 0; i < ETH_ALEN; i++)
1035 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1036
1037 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
1038
1039 vp = netdev_priv(dev);
1040
1041 spin_lock_init(&vp->lock);
1042 vp->dev = dev;
1043
1044 INIT_LIST_HEAD(&vp->port_list);
1045 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1046 INIT_HLIST_HEAD(&vp->port_hash[i]);
1047 INIT_LIST_HEAD(&vp->list);
1048 vp->local_mac = *local_mac;
1049
1050 dev->netdev_ops = &vnet_ops;
1051 dev->ethtool_ops = &vnet_ethtool_ops;
1052 dev->watchdog_timeo = VNET_TX_TIMEOUT;
1053
1054 err = register_netdev(dev);
1055 if (err) {
1056 printk(KERN_ERR PFX "Cannot register net device, "
1057 "aborting.\n");
1058 goto err_out_free_dev;
1059 }
1060
1061 printk(KERN_INFO "%s: Sun LDOM vnet %pM\n", dev->name, dev->dev_addr);
1062
1063 list_add(&vp->list, &vnet_list);
1064
1065 return vp;
1066
1067 err_out_free_dev:
1068 free_netdev(dev);
1069
1070 return ERR_PTR(err);
1071 }
1072
1073 static struct vnet * __devinit vnet_find_or_create(const u64 *local_mac)
1074 {
1075 struct vnet *iter, *vp;
1076
1077 mutex_lock(&vnet_list_mutex);
1078 vp = NULL;
1079 list_for_each_entry(iter, &vnet_list, list) {
1080 if (iter->local_mac == *local_mac) {
1081 vp = iter;
1082 break;
1083 }
1084 }
1085 if (!vp)
1086 vp = vnet_new(local_mac);
1087 mutex_unlock(&vnet_list_mutex);
1088
1089 return vp;
1090 }
1091
1092 static const char *local_mac_prop = "local-mac-address";
1093
1094 static struct vnet * __devinit vnet_find_parent(struct mdesc_handle *hp,
1095 u64 port_node)
1096 {
1097 const u64 *local_mac = NULL;
1098 u64 a;
1099
1100 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1101 u64 target = mdesc_arc_target(hp, a);
1102 const char *name;
1103
1104 name = mdesc_get_property(hp, target, "name", NULL);
1105 if (!name || strcmp(name, "network"))
1106 continue;
1107
1108 local_mac = mdesc_get_property(hp, target,
1109 local_mac_prop, NULL);
1110 if (local_mac)
1111 break;
1112 }
1113 if (!local_mac)
1114 return ERR_PTR(-ENODEV);
1115
1116 return vnet_find_or_create(local_mac);
1117 }
1118
1119 static struct ldc_channel_config vnet_ldc_cfg = {
1120 .event = vnet_event,
1121 .mtu = 64,
1122 .mode = LDC_MODE_UNRELIABLE,
1123 };
1124
1125 static struct vio_driver_ops vnet_vio_ops = {
1126 .send_attr = vnet_send_attr,
1127 .handle_attr = vnet_handle_attr,
1128 .handshake_complete = vnet_handshake_complete,
1129 };
1130
1131 static void __devinit print_version(void)
1132 {
1133 static int version_printed;
1134
1135 if (version_printed++ == 0)
1136 printk(KERN_INFO "%s", version);
1137 }
1138
1139 const char *remote_macaddr_prop = "remote-mac-address";
1140
1141 static int __devinit vnet_port_probe(struct vio_dev *vdev,
1142 const struct vio_device_id *id)
1143 {
1144 struct mdesc_handle *hp;
1145 struct vnet_port *port;
1146 unsigned long flags;
1147 struct vnet *vp;
1148 const u64 *rmac;
1149 int len, i, err, switch_port;
1150
1151 print_version();
1152
1153 hp = mdesc_grab();
1154
1155 vp = vnet_find_parent(hp, vdev->mp);
1156 if (IS_ERR(vp)) {
1157 printk(KERN_ERR PFX "Cannot find port parent vnet.\n");
1158 err = PTR_ERR(vp);
1159 goto err_out_put_mdesc;
1160 }
1161
1162 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1163 err = -ENODEV;
1164 if (!rmac) {
1165 printk(KERN_ERR PFX "Port lacks %s property.\n",
1166 remote_macaddr_prop);
1167 goto err_out_put_mdesc;
1168 }
1169
1170 port = kzalloc(sizeof(*port), GFP_KERNEL);
1171 err = -ENOMEM;
1172 if (!port) {
1173 printk(KERN_ERR PFX "Cannot allocate vnet_port.\n");
1174 goto err_out_put_mdesc;
1175 }
1176
1177 for (i = 0; i < ETH_ALEN; i++)
1178 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1179
1180 port->vp = vp;
1181
1182 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1183 vnet_versions, ARRAY_SIZE(vnet_versions),
1184 &vnet_vio_ops, vp->dev->name);
1185 if (err)
1186 goto err_out_free_port;
1187
1188 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1189 if (err)
1190 goto err_out_free_port;
1191
1192 err = vnet_port_alloc_tx_bufs(port);
1193 if (err)
1194 goto err_out_free_ldc;
1195
1196 INIT_HLIST_NODE(&port->hash);
1197 INIT_LIST_HEAD(&port->list);
1198
1199 switch_port = 0;
1200 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1201 switch_port = 1;
1202 port->switch_port = switch_port;
1203
1204 spin_lock_irqsave(&vp->lock, flags);
1205 if (switch_port)
1206 list_add(&port->list, &vp->port_list);
1207 else
1208 list_add_tail(&port->list, &vp->port_list);
1209 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1210 spin_unlock_irqrestore(&vp->lock, flags);
1211
1212 dev_set_drvdata(&vdev->dev, port);
1213
1214 printk(KERN_INFO "%s: PORT ( remote-mac %pM%s )\n",
1215 vp->dev->name, port->raddr,
1216 switch_port ? " switch-port" : "");
1217
1218 vio_port_up(&port->vio);
1219
1220 mdesc_release(hp);
1221
1222 return 0;
1223
1224 err_out_free_ldc:
1225 vio_ldc_free(&port->vio);
1226
1227 err_out_free_port:
1228 kfree(port);
1229
1230 err_out_put_mdesc:
1231 mdesc_release(hp);
1232 return err;
1233 }
1234
1235 static int vnet_port_remove(struct vio_dev *vdev)
1236 {
1237 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1238
1239 if (port) {
1240 struct vnet *vp = port->vp;
1241 unsigned long flags;
1242
1243 del_timer_sync(&port->vio.timer);
1244
1245 spin_lock_irqsave(&vp->lock, flags);
1246 list_del(&port->list);
1247 hlist_del(&port->hash);
1248 spin_unlock_irqrestore(&vp->lock, flags);
1249
1250 vnet_port_free_tx_bufs(port);
1251 vio_ldc_free(&port->vio);
1252
1253 dev_set_drvdata(&vdev->dev, NULL);
1254
1255 kfree(port);
1256 }
1257 return 0;
1258 }
1259
1260 static const struct vio_device_id vnet_port_match[] = {
1261 {
1262 .type = "vnet-port",
1263 },
1264 {},
1265 };
1266 MODULE_DEVICE_TABLE(vio, vnet_port_match);
1267
1268 static struct vio_driver vnet_port_driver = {
1269 .id_table = vnet_port_match,
1270 .probe = vnet_port_probe,
1271 .remove = vnet_port_remove,
1272 .driver = {
1273 .name = "vnet_port",
1274 .owner = THIS_MODULE,
1275 }
1276 };
1277
1278 static int __init vnet_init(void)
1279 {
1280 return vio_register_driver(&vnet_port_driver);
1281 }
1282
1283 static void __exit vnet_exit(void)
1284 {
1285 vio_unregister_driver(&vnet_port_driver);
1286 }
1287
1288 module_init(vnet_init);
1289 module_exit(vnet_exit);
Tomato firmware and modifications.