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[net-next-2.6.git] / drivers / net / sunvnet.c
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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>
9184a046 15#include <linux/mutex.h>
4c521e42
DM		 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
27static char version[] __devinitdata =
28 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
29MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
30MODULE_DESCRIPTION("Sun LDOM virtual network driver");
31MODULE_LICENSE("GPL");
32MODULE_VERSION(DRV_MODULE_VERSION);
33
34/* Ordered from largest major to lowest */
35static struct vio_version vnet_versions[] = {
36 { .major = 1, .minor = 0 },
37};
38
39static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
40{
41 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
42}
43
44static 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
57static 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
86static 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
118static 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
126static 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
134static 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
153static 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 */
179static 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
196static 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
238out_free_skb:
239 kfree_skb(skb);
240
241out_dropped:
242 dev->stats.rx_dropped++;
243 return err;
244}
245
246static 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
279static 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
286static 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
296static 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
312static 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
328static 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:%lx:%lx]\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
358static 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
391static 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[%016lx] rcv_nxt[%016lx]\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%lx] "
404 "rcv_nxt[0x%lx]\n", pkt->seq, dr->rcv_nxt);
405 return 0;
406 }
407
408 dr->rcv_nxt++;
409
410 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
411
412 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
413}
414
415static int idx_is_pending(struct vio_dring_state *dr, u32 end)
416{
417 u32 idx = dr->cons;
418 int found = 0;
419
420 while (idx != dr->prod) {
421 if (idx == end) {
422 found = 1;
423 break;
424 }
425 idx = next_idx(idx, dr);
426 }
427 return found;
428}
429
430static int vnet_ack(struct vnet_port *port, void *msgbuf)
431{
432 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
433 struct vio_dring_data *pkt = msgbuf;
434 struct net_device *dev;
435 struct vnet *vp;
436 u32 end;
437
438 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
439 return 0;
440
441 end = pkt->end_idx;
442 if (unlikely(!idx_is_pending(dr, end)))
443 return 0;
444
445 dr->cons = next_idx(end, dr);
446
447 vp = port->vp;
448 dev = vp->dev;
449 if (unlikely(netif_queue_stopped(dev) &&
450 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
451 return 1;
452
453 return 0;
454}
455
456static int vnet_nack(struct vnet_port *port, void *msgbuf)
457{
458 /* XXX just reset or similar XXX */
459 return 0;
460}
461
462static void maybe_tx_wakeup(struct vnet *vp)
463{
464 struct net_device *dev = vp->dev;
465
466 netif_tx_lock(dev);
467 if (likely(netif_queue_stopped(dev))) {
468 struct vnet_port *port;
469 int wake = 1;
470
471 list_for_each_entry(port, &vp->port_list, list) {
472 struct vio_dring_state *dr;
473
474 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
475 if (vnet_tx_dring_avail(dr) <
476 VNET_TX_WAKEUP_THRESH(dr)) {
477 wake = 0;
478 break;
479 }
480 }
481 if (wake)
482 netif_wake_queue(dev);
483 }
484 netif_tx_unlock(dev);
485}
486
487static void vnet_event(void *arg, int event)
488{
489 struct vnet_port *port = arg;
490 struct vio_driver_state *vio = &port->vio;
491 unsigned long flags;
492 int tx_wakeup, err;
493
494 spin_lock_irqsave(&vio->lock, flags);
495
496 if (unlikely(event == LDC_EVENT_RESET ||
497 event == LDC_EVENT_UP)) {
498 vio_link_state_change(vio, event);
499 spin_unlock_irqrestore(&vio->lock, flags);
500
d762acdb
DM		 501 if (event == LDC_EVENT_RESET)
502 vio_port_up(vio);
4c521e42
DM		 503 return;
504 }
505
506 if (unlikely(event != LDC_EVENT_DATA_READY)) {
507 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
508 spin_unlock_irqrestore(&vio->lock, flags);
509 return;
510 }
511
512 tx_wakeup = err = 0;
513 while (1) {
514 union {
515 struct vio_msg_tag tag;
516 u64 raw[8];
517 } msgbuf;
518
519 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
520 if (unlikely(err < 0)) {
521 if (err == -ECONNRESET)
522 vio_conn_reset(vio);
523 break;
524 }
525 if (err == 0)
526 break;
527 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
528 msgbuf.tag.type,
529 msgbuf.tag.stype,
530 msgbuf.tag.stype_env,
531 msgbuf.tag.sid);
532 err = vio_validate_sid(vio, &msgbuf.tag);
533 if (err < 0)
534 break;
535
536 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
537 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
538 err = vnet_rx(port, &msgbuf);
539 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
540 err = vnet_ack(port, &msgbuf);
541 if (err > 0)
542 tx_wakeup |= err;
543 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
544 err = vnet_nack(port, &msgbuf);
545 }
546 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
547 err = vio_control_pkt_engine(vio, &msgbuf);
548 if (err)
549 break;
550 } else {
551 err = vnet_handle_unknown(port, &msgbuf);
552 }
553 if (err == -ECONNRESET)
554 break;
555 }
556 spin_unlock(&vio->lock);
557 if (unlikely(tx_wakeup && err != -ECONNRESET))
558 maybe_tx_wakeup(port->vp);
559 local_irq_restore(flags);
560}
561
562static int __vnet_tx_trigger(struct vnet_port *port)
563{
564 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
565 struct vio_dring_data hdr = {
566 .tag = {
567 .type = VIO_TYPE_DATA,
568 .stype = VIO_SUBTYPE_INFO,
569 .stype_env = VIO_DRING_DATA,
570 .sid = vio_send_sid(&port->vio),
571 },
572 .dring_ident = dr->ident,
573 .start_idx = dr->prod,
574 .end_idx = (u32) -1,
575 };
576 int err, delay;
577
578 hdr.seq = dr->snd_nxt;
579 delay = 1;
580 do {
581 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
582 if (err > 0) {
583 dr->snd_nxt++;
584 break;
585 }
586 udelay(delay);
587 if ((delay <<= 1) > 128)
588 delay = 128;
589 } while (err == -EAGAIN);
590
591 return err;
592}
593
594struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
595{
596 unsigned int hash = vnet_hashfn(skb->data);
597 struct hlist_head *hp = &vp->port_hash[hash];
598 struct hlist_node *n;
599 struct vnet_port *port;
600
601 hlist_for_each_entry(port, n, hp, hash) {
602 if (!compare_ether_addr(port->raddr, skb->data))
603 return port;
604 }
605 port = NULL;
606 if (!list_empty(&vp->port_list))
607 port = list_entry(vp->port_list.next, struct vnet_port, list);
608
609 return port;
610}
611
612struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
613{
614 struct vnet_port *ret;
615 unsigned long flags;
616
617 spin_lock_irqsave(&vp->lock, flags);
618 ret = __tx_port_find(vp, skb);
619 spin_unlock_irqrestore(&vp->lock, flags);
620
621 return ret;
622}
623
624static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
625{
626 struct vnet *vp = netdev_priv(dev);
627 struct vnet_port *port = tx_port_find(vp, skb);
628 struct vio_dring_state *dr;
629 struct vio_net_desc *d;
630 unsigned long flags;
631 unsigned int len;
632 void *tx_buf;
633 int i, err;
634
635 if (unlikely(!port))
636 goto out_dropped;
637
638 spin_lock_irqsave(&port->vio.lock, flags);
639
640 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
641 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
642 if (!netif_queue_stopped(dev)) {
643 netif_stop_queue(dev);
644
645 /* This is a hard error, log it. */
646 printk(KERN_ERR PFX "%s: BUG! Tx Ring full when "
647 "queue awake!\n", dev->name);
648 dev->stats.tx_errors++;
649 }
650 spin_unlock_irqrestore(&port->vio.lock, flags);
651 return NETDEV_TX_BUSY;
652 }
653
654 d = vio_dring_cur(dr);
655
656 tx_buf = port->tx_bufs[dr->prod].buf;
657 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
658
659 len = skb->len;
660 if (len < ETH_ZLEN) {
661 len = ETH_ZLEN;
662 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
663 }
664
665 d->hdr.ack = VIO_ACK_ENABLE;
666 d->size = len;
667 d->ncookies = port->tx_bufs[dr->prod].ncookies;
668 for (i = 0; i < d->ncookies; i++)
669 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
670
671 /* This has to be a non-SMP write barrier because we are writing
672 * to memory which is shared with the peer LDOM.
673 */
674 wmb();
675
676 d->hdr.state = VIO_DESC_READY;
677
678 err = __vnet_tx_trigger(port);
679 if (unlikely(err < 0)) {
680 printk(KERN_INFO PFX "%s: TX trigger error %d\n",
681 dev->name, err);
682 d->hdr.state = VIO_DESC_FREE;
683 dev->stats.tx_carrier_errors++;
684 goto out_dropped_unlock;
685 }
686
687 dev->stats.tx_packets++;
688 dev->stats.tx_bytes += skb->len;
689
690 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
691 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
692 netif_stop_queue(dev);
693 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
694 netif_wake_queue(dev);
695 }
696
697 spin_unlock_irqrestore(&port->vio.lock, flags);
698
699 dev_kfree_skb(skb);
700
701 dev->trans_start = jiffies;
702 return NETDEV_TX_OK;
703
704out_dropped_unlock:
705 spin_unlock_irqrestore(&port->vio.lock, flags);
706
707out_dropped:
708 dev_kfree_skb(skb);
709 dev->stats.tx_dropped++;
710 return NETDEV_TX_OK;
711}
712
713static void vnet_tx_timeout(struct net_device *dev)
714{
715 /* XXX Implement me XXX */
716}
717
718static int vnet_open(struct net_device *dev)
719{
720 netif_carrier_on(dev);
721 netif_start_queue(dev);
722
723 return 0;
724}
725
726static int vnet_close(struct net_device *dev)
727{
728 netif_stop_queue(dev);
729 netif_carrier_off(dev);
730
731 return 0;
732}
733
734static void vnet_set_rx_mode(struct net_device *dev)
735{
736 /* XXX Implement multicast support XXX */
737}
738
739static int vnet_change_mtu(struct net_device *dev, int new_mtu)
740{
741 if (new_mtu != ETH_DATA_LEN)
742 return -EINVAL;
743
744 dev->mtu = new_mtu;
745 return 0;
746}
747
748static int vnet_set_mac_addr(struct net_device *dev, void *p)
749{
750 return -EINVAL;
751}
752
753static void vnet_get_drvinfo(struct net_device *dev,
754 struct ethtool_drvinfo *info)
755{
756 strcpy(info->driver, DRV_MODULE_NAME);
757 strcpy(info->version, DRV_MODULE_VERSION);
758}
759
760static u32 vnet_get_msglevel(struct net_device *dev)
761{
762 struct vnet *vp = netdev_priv(dev);
763 return vp->msg_enable;
764}
765
766static void vnet_set_msglevel(struct net_device *dev, u32 value)
767{
768 struct vnet *vp = netdev_priv(dev);
769 vp->msg_enable = value;
770}
771
772static const struct ethtool_ops vnet_ethtool_ops = {
773 .get_drvinfo = vnet_get_drvinfo,
774 .get_msglevel = vnet_get_msglevel,
775 .set_msglevel = vnet_set_msglevel,
776 .get_link = ethtool_op_get_link,
777 .get_perm_addr = ethtool_op_get_perm_addr,
778};
779
780static void vnet_port_free_tx_bufs(struct vnet_port *port)
781{
782 struct vio_dring_state *dr;
783 int i;
784
785 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
786 if (dr->base) {
787 ldc_free_exp_dring(port->vio.lp, dr->base,
788 (dr->entry_size * dr->num_entries),
789 dr->cookies, dr->ncookies);
790 dr->base = NULL;
791 dr->entry_size = 0;
792 dr->num_entries = 0;
793 dr->pending = 0;
794 dr->ncookies = 0;
795 }
796
797 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
798 void *buf = port->tx_bufs[i].buf;
799
800 if (!buf)
801 continue;
802
803 ldc_unmap(port->vio.lp,
804 port->tx_bufs[i].cookies,
805 port->tx_bufs[i].ncookies);
806
807 kfree(buf);
808 port->tx_bufs[i].buf = NULL;
809 }
810}
811
812static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
813{
814 struct vio_dring_state *dr;
815 unsigned long len;
816 int i, err, ncookies;
817 void *dring;
818
819 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
820 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
821 int map_len = (ETH_FRAME_LEN + 7) & ~7;
822
823 err = -ENOMEM;
824 if (!buf) {
825 printk(KERN_ERR "TX buffer allocation failure\n");
826 goto err_out;
827 }
828 err = -EFAULT;
829 if ((unsigned long)buf & (8UL - 1)) {
830 printk(KERN_ERR "TX buffer misaligned\n");
831 kfree(buf);
832 goto err_out;
833 }
834
835 err = ldc_map_single(port->vio.lp, buf, map_len,
836 port->tx_bufs[i].cookies, 2,
837 (LDC_MAP_SHADOW |
838 LDC_MAP_DIRECT |
839 LDC_MAP_RW));
840 if (err < 0) {
841 kfree(buf);
842 goto err_out;
843 }
844 port->tx_bufs[i].buf = buf;
845 port->tx_bufs[i].ncookies = err;
846 }
847
848 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
849
850 len = (VNET_TX_RING_SIZE *
851 (sizeof(struct vio_net_desc) +
852 (sizeof(struct ldc_trans_cookie) * 2)));
853
854 ncookies = VIO_MAX_RING_COOKIES;
855 dring = ldc_alloc_exp_dring(port->vio.lp, len,
856 dr->cookies, &ncookies,
857 (LDC_MAP_SHADOW |
858 LDC_MAP_DIRECT |
859 LDC_MAP_RW));
860 if (IS_ERR(dring)) {
861 err = PTR_ERR(dring);
862 goto err_out;
863 }
864
865 dr->base = dring;
866 dr->entry_size = (sizeof(struct vio_net_desc) +
867 (sizeof(struct ldc_trans_cookie) * 2));
868 dr->num_entries = VNET_TX_RING_SIZE;
869 dr->prod = dr->cons = 0;
870 dr->pending = VNET_TX_RING_SIZE;
871 dr->ncookies = ncookies;
872
873 return 0;
874
875err_out:
876 vnet_port_free_tx_bufs(port);
877
878 return err;
879}
880
9184a046
DM		 881static LIST_HEAD(vnet_list);
882static DEFINE_MUTEX(vnet_list_mutex);
883
884static struct vnet * __devinit vnet_new(const u64 *local_mac)
885{
886 struct net_device *dev;
887 struct vnet *vp;
888 int err, i;
889
890 dev = alloc_etherdev(sizeof(*vp));
891 if (!dev) {
892 printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
893 return ERR_PTR(-ENOMEM);
894 }
895
896 for (i = 0; i < ETH_ALEN; i++)
897 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
898
899 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
900
901 vp = netdev_priv(dev);
902
903 spin_lock_init(&vp->lock);
904 vp->dev = dev;
905
906 INIT_LIST_HEAD(&vp->port_list);
907 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
908 INIT_HLIST_HEAD(&vp->port_hash[i]);
909 INIT_LIST_HEAD(&vp->list);
910 vp->local_mac = *local_mac;
911
912 dev->open = vnet_open;
913 dev->stop = vnet_close;
914 dev->set_multicast_list = vnet_set_rx_mode;
915 dev->set_mac_address = vnet_set_mac_addr;
916 dev->tx_timeout = vnet_tx_timeout;
917 dev->ethtool_ops = &vnet_ethtool_ops;
918 dev->watchdog_timeo = VNET_TX_TIMEOUT;
919 dev->change_mtu = vnet_change_mtu;
920 dev->hard_start_xmit = vnet_start_xmit;
921
922 err = register_netdev(dev);
923 if (err) {
924 printk(KERN_ERR PFX "Cannot register net device, "
925 "aborting.\n");
926 goto err_out_free_dev;
927 }
928
929 printk(KERN_INFO "%s: Sun LDOM vnet ", dev->name);
930
931 for (i = 0; i < 6; i++)
932 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
933
934 list_add(&vp->list, &vnet_list);
935
936 return vp;
937
938err_out_free_dev:
939 free_netdev(dev);
940
941 return ERR_PTR(err);
942}
943
944static struct vnet * __devinit vnet_find_or_create(const u64 *local_mac)
945{
946 struct vnet *iter, *vp;
947
948 mutex_lock(&vnet_list_mutex);
949 vp = NULL;
950 list_for_each_entry(iter, &vnet_list, list) {
951 if (iter->local_mac == *local_mac) {
952 vp = iter;
953 break;
954 }
955 }
956 if (!vp)
957 vp = vnet_new(local_mac);
958 mutex_unlock(&vnet_list_mutex);
959
960 return vp;
961}
962
963static const char *local_mac_prop = "local-mac-address";
964
965static struct vnet * __devinit vnet_find_parent(struct mdesc_handle *hp,
966 u64 port_node)
967{
968 const u64 *local_mac = NULL;
969 u64 a;
970
971 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
972 u64 target = mdesc_arc_target(hp, a);
973 const char *name;
974
975 name = mdesc_get_property(hp, target, "name", NULL);
976 if (!name || strcmp(name, "network"))
977 continue;
978
979 local_mac = mdesc_get_property(hp, target,
980 local_mac_prop, NULL);
981 if (local_mac)
982 break;
983 }
984 if (!local_mac)
985 return ERR_PTR(-ENODEV);
986
987 return vnet_find_or_create(local_mac);
988}
989
4c521e42
DM		 990static struct ldc_channel_config vnet_ldc_cfg = {
991 .event = vnet_event,
992 .mtu = 64,
993 .mode = LDC_MODE_UNRELIABLE,
994};
995
996static struct vio_driver_ops vnet_vio_ops = {
997 .send_attr = vnet_send_attr,
998 .handle_attr = vnet_handle_attr,
999 .handshake_complete = vnet_handshake_complete,
1000};
1001
9184a046
DM		 1002static void print_version(void)
1003{
1004 static int version_printed;
1005
1006 if (version_printed++ == 0)
1007 printk(KERN_INFO "%s", version);
1008}
1009
4c521e42
DM		 1010const char *remote_macaddr_prop = "remote-mac-address";
1011
1012static int __devinit vnet_port_probe(struct vio_dev *vdev,
1013 const struct vio_device_id *id)
1014{
43fdf274 1015 struct mdesc_handle *hp;
4c521e42
DM		 1016 struct vnet_port *port;
1017 unsigned long flags;
1018 struct vnet *vp;
1019 const u64 *rmac;
1020 int len, i, err, switch_port;
1021
9184a046 1022 print_version();
4c521e42 1023
43fdf274
DM		 1024 hp = mdesc_grab();
1025
9184a046
DM		 1026 vp = vnet_find_parent(hp, vdev->mp);
1027 if (IS_ERR(vp)) {
1028 printk(KERN_ERR PFX "Cannot find port parent vnet.\n");
1029 err = PTR_ERR(vp);
1030 goto err_out_put_mdesc;
1031 }
1032
43fdf274
DM		 1033 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1034 err = -ENODEV;
4c521e42
DM		 1035 if (!rmac) {
1036 printk(KERN_ERR PFX "Port lacks %s property.\n",
1037 remote_macaddr_prop);
43fdf274 1038 goto err_out_put_mdesc;
4c521e42
DM		 1039 }
1040
1041 port = kzalloc(sizeof(*port), GFP_KERNEL);
43fdf274 1042 err = -ENOMEM;
4c521e42
DM		 1043 if (!port) {
1044 printk(KERN_ERR PFX "Cannot allocate vnet_port.\n");
43fdf274 1045 goto err_out_put_mdesc;
4c521e42
DM		 1046 }
1047
1048 for (i = 0; i < ETH_ALEN; i++)
1049 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1050
1051 port->vp = vp;
1052
43fdf274 1053 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
4c521e42
DM		 1054 vnet_versions, ARRAY_SIZE(vnet_versions),
1055 &vnet_vio_ops, vp->dev->name);
1056 if (err)
1057 goto err_out_free_port;
1058
1059 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1060 if (err)
1061 goto err_out_free_port;
1062
1063 err = vnet_port_alloc_tx_bufs(port);
1064 if (err)
1065 goto err_out_free_ldc;
1066
1067 INIT_HLIST_NODE(&port->hash);
1068 INIT_LIST_HEAD(&port->list);
1069
1070 switch_port = 0;
43fdf274 1071 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
4c521e42
DM		 1072 switch_port = 1;
1073
1074 spin_lock_irqsave(&vp->lock, flags);
1075 if (switch_port)
1076 list_add(&port->list, &vp->port_list);
1077 else
1078 list_add_tail(&port->list, &vp->port_list);
1079 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1080 spin_unlock_irqrestore(&vp->lock, flags);
1081
1082 dev_set_drvdata(&vdev->dev, port);
1083
1084 printk(KERN_INFO "%s: PORT ( remote-mac ", vp->dev->name);
1085 for (i = 0; i < 6; i++)
1086 printk("%2.2x%c", port->raddr[i], i == 5 ? ' ' : ':');
1087 if (switch_port)
1088 printk("switch-port ");
1089 printk(")\n");
1090
1091 vio_port_up(&port->vio);
1092
43fdf274
DM		 1093 mdesc_release(hp);
1094
4c521e42
DM		 1095 return 0;
1096
1097err_out_free_ldc:
1098 vio_ldc_free(&port->vio);
1099
1100err_out_free_port:
1101 kfree(port);
1102
43fdf274
DM		 1103err_out_put_mdesc:
1104 mdesc_release(hp);
4c521e42
DM		 1105 return err;
1106}
1107
1108static int vnet_port_remove(struct vio_dev *vdev)
1109{
1110 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1111
1112 if (port) {
1113 struct vnet *vp = port->vp;
1114 unsigned long flags;
1115
1116 del_timer_sync(&port->vio.timer);
1117
1118 spin_lock_irqsave(&vp->lock, flags);
1119 list_del(&port->list);
1120 hlist_del(&port->hash);
1121 spin_unlock_irqrestore(&vp->lock, flags);
1122
1123 vnet_port_free_tx_bufs(port);
1124 vio_ldc_free(&port->vio);
1125
1126 dev_set_drvdata(&vdev->dev, NULL);
1127
1128 kfree(port);
1129 }
1130 return 0;
1131}
1132
1133static struct vio_device_id vnet_port_match[] = {
1134 {
1135 .type = "vnet-port",
1136 },
1137 {},
1138};
1139MODULE_DEVICE_TABLE(vio, vnet_match);
1140
1141static struct vio_driver vnet_port_driver = {
1142 .id_table = vnet_port_match,
1143 .probe = vnet_port_probe,
1144 .remove = vnet_port_remove,
1145 .driver = {
1146 .name = "vnet_port",
1147 .owner = THIS_MODULE,
1148 }
1149};
1150
4c521e42
DM		 1151static int __init vnet_init(void)
1152{
9184a046 1153 return vio_register_driver(&vnet_port_driver);
4c521e42
DM		 1154}
1155
1156static void __exit vnet_exit(void)
1157{
1158 vio_unregister_driver(&vnet_port_driver);
4c521e42
DM		 1159}
1160
1161module_init(vnet_init);
1162module_exit(vnet_exit);
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