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mm: fix dubious code in __count_immobile_pages()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / sunvnet.c
blobbf3c762de6204ac7c2536e210e1b89a16e5a28d0
1 /* sunvnet.c: Sun LDOM Virtual Network Driver.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/slab.h>
12 #include <linux/delay.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/ethtool.h>
16 #include <linux/etherdevice.h>
17 #include <linux/mutex.h>
18
19 #include <asm/vio.h>
20 #include <asm/ldc.h>
21
22 #include "sunvnet.h"
23
24 #define DRV_MODULE_NAME "sunvnet"
25 #define DRV_MODULE_VERSION "1.0"
26 #define DRV_MODULE_RELDATE "June 25, 2007"
27
28 static char version[] __devinitdata =
29 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
30 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
31 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
32 MODULE_LICENSE("GPL");
33 MODULE_VERSION(DRV_MODULE_VERSION);
34
35 /* Ordered from largest major to lowest */
36 static struct vio_version vnet_versions[] = {
37 { .major = 1, .minor = 0 },
38 };
39
40 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
41 {
42 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
43 }
44
45 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
46 {
47 struct vio_msg_tag *pkt = arg;
48
49 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
50 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
51 pr_err("Resetting connection\n");
52
53 ldc_disconnect(port->vio.lp);
54
55 return -ECONNRESET;
56 }
57
58 static int vnet_send_attr(struct vio_driver_state *vio)
59 {
60 struct vnet_port *port = to_vnet_port(vio);
61 struct net_device *dev = port->vp->dev;
62 struct vio_net_attr_info pkt;
63 int i;
64
65 memset(&pkt, 0, sizeof(pkt));
66 pkt.tag.type = VIO_TYPE_CTRL;
67 pkt.tag.stype = VIO_SUBTYPE_INFO;
68 pkt.tag.stype_env = VIO_ATTR_INFO;
69 pkt.tag.sid = vio_send_sid(vio);
70 pkt.xfer_mode = VIO_DRING_MODE;
71 pkt.addr_type = VNET_ADDR_ETHERMAC;
72 pkt.ack_freq = 0;
73 for (i = 0; i < 6; i++)
74 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
75 pkt.mtu = ETH_FRAME_LEN;
76
77 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
78 "ackfreq[%u] mtu[%llu]\n",
79 pkt.xfer_mode, pkt.addr_type,
80 (unsigned long long) pkt.addr,
81 pkt.ack_freq,
82 (unsigned long long) pkt.mtu);
83
84 return vio_ldc_send(vio, &pkt, sizeof(pkt));
85 }
86
87 static int handle_attr_info(struct vio_driver_state *vio,
88 struct vio_net_attr_info *pkt)
89 {
90 viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
91 "ackfreq[%u] mtu[%llu]\n",
92 pkt->xfer_mode, pkt->addr_type,
93 (unsigned long long) pkt->addr,
94 pkt->ack_freq,
95 (unsigned long long) pkt->mtu);
96
97 pkt->tag.sid = vio_send_sid(vio);
98
99 if (pkt->xfer_mode != VIO_DRING_MODE ||
100 pkt->addr_type != VNET_ADDR_ETHERMAC ||
101 pkt->mtu != ETH_FRAME_LEN) {
102 viodbg(HS, "SEND NET ATTR NACK\n");
103
104 pkt->tag.stype = VIO_SUBTYPE_NACK;
105
106 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
107
108 return -ECONNRESET;
109 } else {
110 viodbg(HS, "SEND NET ATTR ACK\n");
111
112 pkt->tag.stype = VIO_SUBTYPE_ACK;
113
114 return vio_ldc_send(vio, pkt, sizeof(*pkt));
115 }
116
117 }
118
119 static int handle_attr_ack(struct vio_driver_state *vio,
120 struct vio_net_attr_info *pkt)
121 {
122 viodbg(HS, "GOT NET ATTR ACK\n");
123
124 return 0;
125 }
126
127 static int handle_attr_nack(struct vio_driver_state *vio,
128 struct vio_net_attr_info *pkt)
129 {
130 viodbg(HS, "GOT NET ATTR NACK\n");
131
132 return -ECONNRESET;
133 }
134
135 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
136 {
137 struct vio_net_attr_info *pkt = arg;
138
139 switch (pkt->tag.stype) {
140 case VIO_SUBTYPE_INFO:
141 return handle_attr_info(vio, pkt);
142
143 case VIO_SUBTYPE_ACK:
144 return handle_attr_ack(vio, pkt);
145
146 case VIO_SUBTYPE_NACK:
147 return handle_attr_nack(vio, pkt);
148
149 default:
150 return -ECONNRESET;
151 }
152 }
153
154 static void vnet_handshake_complete(struct vio_driver_state *vio)
155 {
156 struct vio_dring_state *dr;
157
158 dr = &vio->drings[VIO_DRIVER_RX_RING];
159 dr->snd_nxt = dr->rcv_nxt = 1;
160
161 dr = &vio->drings[VIO_DRIVER_TX_RING];
162 dr->snd_nxt = dr->rcv_nxt = 1;
163 }
164
165 /* The hypervisor interface that implements copying to/from imported
166 * memory from another domain requires that copies are done to 8-byte
167 * aligned buffers, and that the lengths of such copies are also 8-byte
168 * multiples.
169 *
170 * So we align skb->data to an 8-byte multiple and pad-out the data
171 * area so we can round the copy length up to the next multiple of
172 * 8 for the copy.
173 *
174 * The transmitter puts the actual start of the packet 6 bytes into
175 * the buffer it sends over, so that the IP headers after the ethernet
176 * header are aligned properly. These 6 bytes are not in the descriptor
177 * length, they are simply implied. This offset is represented using
178 * the VNET_PACKET_SKIP macro.
179 */
180 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
181 unsigned int len)
182 {
183 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
184 unsigned long addr, off;
185
186 if (unlikely(!skb))
187 return NULL;
188
189 addr = (unsigned long) skb->data;
190 off = ((addr + 7UL) & ~7UL) - addr;
191 if (off)
192 skb_reserve(skb, off);
193
194 return skb;
195 }
196
197 static int vnet_rx_one(struct vnet_port *port, unsigned int len,
198 struct ldc_trans_cookie *cookies, int ncookies)
199 {
200 struct net_device *dev = port->vp->dev;
201 unsigned int copy_len;
202 struct sk_buff *skb;
203 int err;
204
205 err = -EMSGSIZE;
206 if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
207 dev->stats.rx_length_errors++;
208 goto out_dropped;
209 }
210
211 skb = alloc_and_align_skb(dev, len);
212 err = -ENOMEM;
213 if (unlikely(!skb)) {
214 dev->stats.rx_missed_errors++;
215 goto out_dropped;
216 }
217
218 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
219 skb_put(skb, copy_len);
220 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
221 skb->data, copy_len, 0,
222 cookies, ncookies);
223 if (unlikely(err < 0)) {
224 dev->stats.rx_frame_errors++;
225 goto out_free_skb;
226 }
227
228 skb_pull(skb, VNET_PACKET_SKIP);
229 skb_trim(skb, len);
230 skb->protocol = eth_type_trans(skb, dev);
231
232 dev->stats.rx_packets++;
233 dev->stats.rx_bytes += len;
234
235 netif_rx(skb);
236
237 return 0;
238
239 out_free_skb:
240 kfree_skb(skb);
241
242 out_dropped:
243 dev->stats.rx_dropped++;
244 return err;
245 }
246
247 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
248 u32 start, u32 end, u8 vio_dring_state)
249 {
250 struct vio_dring_data hdr = {
251 .tag = {
252 .type = VIO_TYPE_DATA,
253 .stype = VIO_SUBTYPE_ACK,
254 .stype_env = VIO_DRING_DATA,
255 .sid = vio_send_sid(&port->vio),
256 },
257 .dring_ident = dr->ident,
258 .start_idx = start,
259 .end_idx = end,
260 .state = vio_dring_state,
261 };
262 int err, delay;
263
264 hdr.seq = dr->snd_nxt;
265 delay = 1;
266 do {
267 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
268 if (err > 0) {
269 dr->snd_nxt++;
270 break;
271 }
272 udelay(delay);
273 if ((delay <<= 1) > 128)
274 delay = 128;
275 } while (err == -EAGAIN);
276
277 return err;
278 }
279
280 static u32 next_idx(u32 idx, struct vio_dring_state *dr)
281 {
282 if (++idx == dr->num_entries)
283 idx = 0;
284 return idx;
285 }
286
287 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
288 {
289 if (idx == 0)
290 idx = dr->num_entries - 1;
291 else
292 idx--;
293
294 return idx;
295 }
296
297 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
298 struct vio_dring_state *dr,
299 u32 index)
300 {
301 struct vio_net_desc *desc = port->vio.desc_buf;
302 int err;
303
304 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
305 (index * dr->entry_size),
306 dr->cookies, dr->ncookies);
307 if (err < 0)
308 return ERR_PTR(err);
309
310 return desc;
311 }
312
313 static int put_rx_desc(struct vnet_port *port,
314 struct vio_dring_state *dr,
315 struct vio_net_desc *desc,
316 u32 index)
317 {
318 int err;
319
320 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
321 (index * dr->entry_size),
322 dr->cookies, dr->ncookies);
323 if (err < 0)
324 return err;
325
326 return 0;
327 }
328
329 static int vnet_walk_rx_one(struct vnet_port *port,
330 struct vio_dring_state *dr,
331 u32 index, int *needs_ack)
332 {
333 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
334 struct vio_driver_state *vio = &port->vio;
335 int err;
336
337 if (IS_ERR(desc))
338 return PTR_ERR(desc);
339
340 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
341 desc->hdr.state, desc->hdr.ack,
342 desc->size, desc->ncookies,
343 desc->cookies[0].cookie_addr,
344 desc->cookies[0].cookie_size);
345
346 if (desc->hdr.state != VIO_DESC_READY)
347 return 1;
348 err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
349 if (err == -ECONNRESET)
350 return err;
351 desc->hdr.state = VIO_DESC_DONE;
352 err = put_rx_desc(port, dr, desc, index);
353 if (err < 0)
354 return err;
355 *needs_ack = desc->hdr.ack;
356 return 0;
357 }
358
359 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
360 u32 start, u32 end)
361 {
362 struct vio_driver_state *vio = &port->vio;
363 int ack_start = -1, ack_end = -1;
364
365 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
366
367 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
368
369 while (start != end) {
370 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
371 if (err == -ECONNRESET)
372 return err;
373 if (err != 0)
374 break;
375 if (ack_start == -1)
376 ack_start = start;
377 ack_end = start;
378 start = next_idx(start, dr);
379 if (ack && start != end) {
380 err = vnet_send_ack(port, dr, ack_start, ack_end,
381 VIO_DRING_ACTIVE);
382 if (err == -ECONNRESET)
383 return err;
384 ack_start = -1;
385 }
386 }
387 if (unlikely(ack_start == -1))
388 ack_start = ack_end = prev_idx(start, dr);
389 return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
390 }
391
392 static int vnet_rx(struct vnet_port *port, void *msgbuf)
393 {
394 struct vio_dring_data *pkt = msgbuf;
395 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
396 struct vio_driver_state *vio = &port->vio;
397
398 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
399 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
400
401 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
402 return 0;
403 if (unlikely(pkt->seq != dr->rcv_nxt)) {
404 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
405 pkt->seq, dr->rcv_nxt);
406 return 0;
407 }
408
409 dr->rcv_nxt++;
410
411 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
412
413 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
414 }
415
416 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
417 {
418 u32 idx = dr->cons;
419 int found = 0;
420
421 while (idx != dr->prod) {
422 if (idx == end) {
423 found = 1;
424 break;
425 }
426 idx = next_idx(idx, dr);
427 }
428 return found;
429 }
430
431 static int vnet_ack(struct vnet_port *port, void *msgbuf)
432 {
433 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
434 struct vio_dring_data *pkt = msgbuf;
435 struct net_device *dev;
436 struct vnet *vp;
437 u32 end;
438
439 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
440 return 0;
441
442 end = pkt->end_idx;
443 if (unlikely(!idx_is_pending(dr, end)))
444 return 0;
445
446 dr->cons = next_idx(end, dr);
447
448 vp = port->vp;
449 dev = vp->dev;
450 if (unlikely(netif_queue_stopped(dev) &&
451 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
452 return 1;
453
454 return 0;
455 }
456
457 static int vnet_nack(struct vnet_port *port, void *msgbuf)
458 {
459 /* XXX just reset or similar XXX */
460 return 0;
461 }
462
463 static int handle_mcast(struct vnet_port *port, void *msgbuf)
464 {
465 struct vio_net_mcast_info *pkt = msgbuf;
466
467 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
468 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
469 port->vp->dev->name,
470 pkt->tag.type,
471 pkt->tag.stype,
472 pkt->tag.stype_env,
473 pkt->tag.sid);
474
475 return 0;
476 }
477
478 static void maybe_tx_wakeup(struct vnet *vp)
479 {
480 struct net_device *dev = vp->dev;
481
482 netif_tx_lock(dev);
483 if (likely(netif_queue_stopped(dev))) {
484 struct vnet_port *port;
485 int wake = 1;
486
487 list_for_each_entry(port, &vp->port_list, list) {
488 struct vio_dring_state *dr;
489
490 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
491 if (vnet_tx_dring_avail(dr) <
492 VNET_TX_WAKEUP_THRESH(dr)) {
493 wake = 0;
494 break;
495 }
496 }
497 if (wake)
498 netif_wake_queue(dev);
499 }
500 netif_tx_unlock(dev);
501 }
502
503 static void vnet_event(void *arg, int event)
504 {
505 struct vnet_port *port = arg;
506 struct vio_driver_state *vio = &port->vio;
507 unsigned long flags;
508 int tx_wakeup, err;
509
510 spin_lock_irqsave(&vio->lock, flags);
511
512 if (unlikely(event == LDC_EVENT_RESET ||
513 event == LDC_EVENT_UP)) {
514 vio_link_state_change(vio, event);
515 spin_unlock_irqrestore(&vio->lock, flags);
516
517 if (event == LDC_EVENT_RESET)
518 vio_port_up(vio);
519 return;
520 }
521
522 if (unlikely(event != LDC_EVENT_DATA_READY)) {
523 pr_warning("Unexpected LDC event %d\n", event);
524 spin_unlock_irqrestore(&vio->lock, flags);
525 return;
526 }
527
528 tx_wakeup = err = 0;
529 while (1) {
530 union {
531 struct vio_msg_tag tag;
532 u64 raw[8];
533 } msgbuf;
534
535 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
536 if (unlikely(err < 0)) {
537 if (err == -ECONNRESET)
538 vio_conn_reset(vio);
539 break;
540 }
541 if (err == 0)
542 break;
543 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
544 msgbuf.tag.type,
545 msgbuf.tag.stype,
546 msgbuf.tag.stype_env,
547 msgbuf.tag.sid);
548 err = vio_validate_sid(vio, &msgbuf.tag);
549 if (err < 0)
550 break;
551
552 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
553 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
554 err = vnet_rx(port, &msgbuf);
555 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
556 err = vnet_ack(port, &msgbuf);
557 if (err > 0)
558 tx_wakeup |= err;
559 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
560 err = vnet_nack(port, &msgbuf);
561 }
562 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
563 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
564 err = handle_mcast(port, &msgbuf);
565 else
566 err = vio_control_pkt_engine(vio, &msgbuf);
567 if (err)
568 break;
569 } else {
570 err = vnet_handle_unknown(port, &msgbuf);
571 }
572 if (err == -ECONNRESET)
573 break;
574 }
575 spin_unlock(&vio->lock);
576 if (unlikely(tx_wakeup && err != -ECONNRESET))
577 maybe_tx_wakeup(port->vp);
578 local_irq_restore(flags);
579 }
580
581 static int __vnet_tx_trigger(struct vnet_port *port)
582 {
583 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
584 struct vio_dring_data hdr = {
585 .tag = {
586 .type = VIO_TYPE_DATA,
587 .stype = VIO_SUBTYPE_INFO,
588 .stype_env = VIO_DRING_DATA,
589 .sid = vio_send_sid(&port->vio),
590 },
591 .dring_ident = dr->ident,
592 .start_idx = dr->prod,
593 .end_idx = (u32) -1,
594 };
595 int err, delay;
596
597 hdr.seq = dr->snd_nxt;
598 delay = 1;
599 do {
600 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
601 if (err > 0) {
602 dr->snd_nxt++;
603 break;
604 }
605 udelay(delay);
606 if ((delay <<= 1) > 128)
607 delay = 128;
608 } while (err == -EAGAIN);
609
610 return err;
611 }
612
613 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
614 {
615 unsigned int hash = vnet_hashfn(skb->data);
616 struct hlist_head *hp = &vp->port_hash[hash];
617 struct hlist_node *n;
618 struct vnet_port *port;
619
620 hlist_for_each_entry(port, n, hp, hash) {
621 if (!compare_ether_addr(port->raddr, skb->data))
622 return port;
623 }
624 port = NULL;
625 if (!list_empty(&vp->port_list))
626 port = list_entry(vp->port_list.next, struct vnet_port, list);
627
628 return port;
629 }
630
631 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
632 {
633 struct vnet_port *ret;
634 unsigned long flags;
635
636 spin_lock_irqsave(&vp->lock, flags);
637 ret = __tx_port_find(vp, skb);
638 spin_unlock_irqrestore(&vp->lock, flags);
639
640 return ret;
641 }
642
643 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
644 {
645 struct vnet *vp = netdev_priv(dev);
646 struct vnet_port *port = tx_port_find(vp, skb);
647 struct vio_dring_state *dr;
648 struct vio_net_desc *d;
649 unsigned long flags;
650 unsigned int len;
651 void *tx_buf;
652 int i, err;
653
654 if (unlikely(!port))
655 goto out_dropped;
656
657 spin_lock_irqsave(&port->vio.lock, flags);
658
659 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
660 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
661 if (!netif_queue_stopped(dev)) {
662 netif_stop_queue(dev);
663
664 /* This is a hard error, log it. */
665 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
666 dev->stats.tx_errors++;
667 }
668 spin_unlock_irqrestore(&port->vio.lock, flags);
669 return NETDEV_TX_BUSY;
670 }
671
672 d = vio_dring_cur(dr);
673
674 tx_buf = port->tx_bufs[dr->prod].buf;
675 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
676
677 len = skb->len;
678 if (len < ETH_ZLEN) {
679 len = ETH_ZLEN;
680 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
681 }
682
683 d->hdr.ack = VIO_ACK_ENABLE;
684 d->size = len;
685 d->ncookies = port->tx_bufs[dr->prod].ncookies;
686 for (i = 0; i < d->ncookies; i++)
687 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
688
689 /* This has to be a non-SMP write barrier because we are writing
690 * to memory which is shared with the peer LDOM.
691 */
692 wmb();
693
694 d->hdr.state = VIO_DESC_READY;
695
696 err = __vnet_tx_trigger(port);
697 if (unlikely(err < 0)) {
698 netdev_info(dev, "TX trigger error %d\n", 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 /* XXX Implement me XXX */
732 }
733
734 static int vnet_open(struct net_device *dev)
735 {
736 netif_carrier_on(dev);
737 netif_start_queue(dev);
738
739 return 0;
740 }
741
742 static int vnet_close(struct net_device *dev)
743 {
744 netif_stop_queue(dev);
745 netif_carrier_off(dev);
746
747 return 0;
748 }
749
750 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
751 {
752 struct vnet_mcast_entry *m;
753
754 for (m = vp->mcast_list; m; m = m->next) {
755 if (!memcmp(m->addr, addr, ETH_ALEN))
756 return m;
757 }
758 return NULL;
759 }
760
761 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
762 {
763 struct netdev_hw_addr *ha;
764
765 netdev_for_each_mc_addr(ha, dev) {
766 struct vnet_mcast_entry *m;
767
768 m = __vnet_mc_find(vp, ha->addr);
769 if (m) {
770 m->hit = 1;
771 continue;
772 }
773
774 if (!m) {
775 m = kzalloc(sizeof(*m), GFP_ATOMIC);
776 if (!m)
777 continue;
778 memcpy(m->addr, ha->addr, ETH_ALEN);
779 m->hit = 1;
780
781 m->next = vp->mcast_list;
782 vp->mcast_list = m;
783 }
784 }
785 }
786
787 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
788 {
789 struct vio_net_mcast_info info;
790 struct vnet_mcast_entry *m, **pp;
791 int n_addrs;
792
793 memset(&info, 0, sizeof(info));
794
795 info.tag.type = VIO_TYPE_CTRL;
796 info.tag.stype = VIO_SUBTYPE_INFO;
797 info.tag.stype_env = VNET_MCAST_INFO;
798 info.tag.sid = vio_send_sid(&port->vio);
799 info.set = 1;
800
801 n_addrs = 0;
802 for (m = vp->mcast_list; m; m = m->next) {
803 if (m->sent)
804 continue;
805 m->sent = 1;
806 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
807 m->addr, ETH_ALEN);
808 if (++n_addrs == VNET_NUM_MCAST) {
809 info.count = n_addrs;
810
811 (void) vio_ldc_send(&port->vio, &info,
812 sizeof(info));
813 n_addrs = 0;
814 }
815 }
816 if (n_addrs) {
817 info.count = n_addrs;
818 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
819 }
820
821 info.set = 0;
822
823 n_addrs = 0;
824 pp = &vp->mcast_list;
825 while ((m = *pp) != NULL) {
826 if (m->hit) {
827 m->hit = 0;
828 pp = &m->next;
829 continue;
830 }
831
832 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
833 m->addr, ETH_ALEN);
834 if (++n_addrs == VNET_NUM_MCAST) {
835 info.count = n_addrs;
836 (void) vio_ldc_send(&port->vio, &info,
837 sizeof(info));
838 n_addrs = 0;
839 }
840
841 *pp = m->next;
842 kfree(m);
843 }
844 if (n_addrs) {
845 info.count = n_addrs;
846 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
847 }
848 }
849
850 static void vnet_set_rx_mode(struct net_device *dev)
851 {
852 struct vnet *vp = netdev_priv(dev);
853 struct vnet_port *port;
854 unsigned long flags;
855
856 spin_lock_irqsave(&vp->lock, flags);
857 if (!list_empty(&vp->port_list)) {
858 port = list_entry(vp->port_list.next, struct vnet_port, list);
859
860 if (port->switch_port) {
861 __update_mc_list(vp, dev);
862 __send_mc_list(vp, port);
863 }
864 }
865 spin_unlock_irqrestore(&vp->lock, flags);
866 }
867
868 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
869 {
870 if (new_mtu != ETH_DATA_LEN)
871 return -EINVAL;
872
873 dev->mtu = new_mtu;
874 return 0;
875 }
876
877 static int vnet_set_mac_addr(struct net_device *dev, void *p)
878 {
879 return -EINVAL;
880 }
881
882 static void vnet_get_drvinfo(struct net_device *dev,
883 struct ethtool_drvinfo *info)
884 {
885 strcpy(info->driver, DRV_MODULE_NAME);
886 strcpy(info->version, DRV_MODULE_VERSION);
887 }
888
889 static u32 vnet_get_msglevel(struct net_device *dev)
890 {
891 struct vnet *vp = netdev_priv(dev);
892 return vp->msg_enable;
893 }
894
895 static void vnet_set_msglevel(struct net_device *dev, u32 value)
896 {
897 struct vnet *vp = netdev_priv(dev);
898 vp->msg_enable = value;
899 }
900
901 static const struct ethtool_ops vnet_ethtool_ops = {
902 .get_drvinfo = vnet_get_drvinfo,
903 .get_msglevel = vnet_get_msglevel,
904 .set_msglevel = vnet_set_msglevel,
905 .get_link = ethtool_op_get_link,
906 };
907
908 static void vnet_port_free_tx_bufs(struct vnet_port *port)
909 {
910 struct vio_dring_state *dr;
911 int i;
912
913 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
914 if (dr->base) {
915 ldc_free_exp_dring(port->vio.lp, dr->base,
916 (dr->entry_size * dr->num_entries),
917 dr->cookies, dr->ncookies);
918 dr->base = NULL;
919 dr->entry_size = 0;
920 dr->num_entries = 0;
921 dr->pending = 0;
922 dr->ncookies = 0;
923 }
924
925 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
926 void *buf = port->tx_bufs[i].buf;
927
928 if (!buf)
929 continue;
930
931 ldc_unmap(port->vio.lp,
932 port->tx_bufs[i].cookies,
933 port->tx_bufs[i].ncookies);
934
935 kfree(buf);
936 port->tx_bufs[i].buf = NULL;
937 }
938 }
939
940 static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
941 {
942 struct vio_dring_state *dr;
943 unsigned long len;
944 int i, err, ncookies;
945 void *dring;
946
947 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
948 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
949 int map_len = (ETH_FRAME_LEN + 7) & ~7;
950
951 err = -ENOMEM;
952 if (!buf) {
953 pr_err("TX buffer allocation failure\n");
954 goto err_out;
955 }
956 err = -EFAULT;
957 if ((unsigned long)buf & (8UL - 1)) {
958 pr_err("TX buffer misaligned\n");
959 kfree(buf);
960 goto err_out;
961 }
962
963 err = ldc_map_single(port->vio.lp, buf, map_len,
964 port->tx_bufs[i].cookies, 2,
965 (LDC_MAP_SHADOW |
966 LDC_MAP_DIRECT |
967 LDC_MAP_RW));
968 if (err < 0) {
969 kfree(buf);
970 goto err_out;
971 }
972 port->tx_bufs[i].buf = buf;
973 port->tx_bufs[i].ncookies = err;
974 }
975
976 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
977
978 len = (VNET_TX_RING_SIZE *
979 (sizeof(struct vio_net_desc) +
980 (sizeof(struct ldc_trans_cookie) * 2)));
981
982 ncookies = VIO_MAX_RING_COOKIES;
983 dring = ldc_alloc_exp_dring(port->vio.lp, len,
984 dr->cookies, &ncookies,
985 (LDC_MAP_SHADOW |
986 LDC_MAP_DIRECT |
987 LDC_MAP_RW));
988 if (IS_ERR(dring)) {
989 err = PTR_ERR(dring);
990 goto err_out;
991 }
992
993 dr->base = dring;
994 dr->entry_size = (sizeof(struct vio_net_desc) +
995 (sizeof(struct ldc_trans_cookie) * 2));
996 dr->num_entries = VNET_TX_RING_SIZE;
997 dr->prod = dr->cons = 0;
998 dr->pending = VNET_TX_RING_SIZE;
999 dr->ncookies = ncookies;
1000
1001 return 0;
1002
1003 err_out:
1004 vnet_port_free_tx_bufs(port);
1005
1006 return err;
1007 }
1008
1009 static LIST_HEAD(vnet_list);
1010 static DEFINE_MUTEX(vnet_list_mutex);
1011
1012 static const struct net_device_ops vnet_ops = {
1013 .ndo_open = vnet_open,
1014 .ndo_stop = vnet_close,
1015 .ndo_set_multicast_list = vnet_set_rx_mode,
1016 .ndo_set_mac_address = vnet_set_mac_addr,
1017 .ndo_validate_addr = eth_validate_addr,
1018 .ndo_tx_timeout = vnet_tx_timeout,
1019 .ndo_change_mtu = vnet_change_mtu,
1020 .ndo_start_xmit = vnet_start_xmit,
1021 };
1022
1023 static struct vnet * __devinit vnet_new(const u64 *local_mac)
1024 {
1025 struct net_device *dev;
1026 struct vnet *vp;
1027 int err, i;
1028
1029 dev = alloc_etherdev(sizeof(*vp));
1030 if (!dev) {
1031 pr_err("Etherdev alloc failed, aborting\n");
1032 return ERR_PTR(-ENOMEM);
1033 }
1034
1035 for (i = 0; i < ETH_ALEN; i++)
1036 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1037
1038 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
1039
1040 vp = netdev_priv(dev);
1041
1042 spin_lock_init(&vp->lock);
1043 vp->dev = dev;
1044
1045 INIT_LIST_HEAD(&vp->port_list);
1046 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1047 INIT_HLIST_HEAD(&vp->port_hash[i]);
1048 INIT_LIST_HEAD(&vp->list);
1049 vp->local_mac = *local_mac;
1050
1051 dev->netdev_ops = &vnet_ops;
1052 dev->ethtool_ops = &vnet_ethtool_ops;
1053 dev->watchdog_timeo = VNET_TX_TIMEOUT;
1054
1055 err = register_netdev(dev);
1056 if (err) {
1057 pr_err("Cannot register net device, aborting\n");
1058 goto err_out_free_dev;
1059 }
1060
1061 netdev_info(dev, "Sun LDOM vnet %pM\n", 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 printk_once(KERN_INFO "%s", version);
1134 }
1135
1136 const char *remote_macaddr_prop = "remote-mac-address";
1137
1138 static int __devinit vnet_port_probe(struct vio_dev *vdev,
1139 const struct vio_device_id *id)
1140 {
1141 struct mdesc_handle *hp;
1142 struct vnet_port *port;
1143 unsigned long flags;
1144 struct vnet *vp;
1145 const u64 *rmac;
1146 int len, i, err, switch_port;
1147
1148 print_version();
1149
1150 hp = mdesc_grab();
1151
1152 vp = vnet_find_parent(hp, vdev->mp);
1153 if (IS_ERR(vp)) {
1154 pr_err("Cannot find port parent vnet\n");
1155 err = PTR_ERR(vp);
1156 goto err_out_put_mdesc;
1157 }
1158
1159 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1160 err = -ENODEV;
1161 if (!rmac) {
1162 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1163 goto err_out_put_mdesc;
1164 }
1165
1166 port = kzalloc(sizeof(*port), GFP_KERNEL);
1167 err = -ENOMEM;
1168 if (!port) {
1169 pr_err("Cannot allocate vnet_port\n");
1170 goto err_out_put_mdesc;
1171 }
1172
1173 for (i = 0; i < ETH_ALEN; i++)
1174 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1175
1176 port->vp = vp;
1177
1178 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1179 vnet_versions, ARRAY_SIZE(vnet_versions),
1180 &vnet_vio_ops, vp->dev->name);
1181 if (err)
1182 goto err_out_free_port;
1183
1184 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1185 if (err)
1186 goto err_out_free_port;
1187
1188 err = vnet_port_alloc_tx_bufs(port);
1189 if (err)
1190 goto err_out_free_ldc;
1191
1192 INIT_HLIST_NODE(&port->hash);
1193 INIT_LIST_HEAD(&port->list);
1194
1195 switch_port = 0;
1196 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1197 switch_port = 1;
1198 port->switch_port = switch_port;
1199
1200 spin_lock_irqsave(&vp->lock, flags);
1201 if (switch_port)
1202 list_add(&port->list, &vp->port_list);
1203 else
1204 list_add_tail(&port->list, &vp->port_list);
1205 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1206 spin_unlock_irqrestore(&vp->lock, flags);
1207
1208 dev_set_drvdata(&vdev->dev, port);
1209
1210 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1211 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1212
1213 vio_port_up(&port->vio);
1214
1215 mdesc_release(hp);
1216
1217 return 0;
1218
1219 err_out_free_ldc:
1220 vio_ldc_free(&port->vio);
1221
1222 err_out_free_port:
1223 kfree(port);
1224
1225 err_out_put_mdesc:
1226 mdesc_release(hp);
1227 return err;
1228 }
1229
1230 static int vnet_port_remove(struct vio_dev *vdev)
1231 {
1232 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1233
1234 if (port) {
1235 struct vnet *vp = port->vp;
1236 unsigned long flags;
1237
1238 del_timer_sync(&port->vio.timer);
1239
1240 spin_lock_irqsave(&vp->lock, flags);
1241 list_del(&port->list);
1242 hlist_del(&port->hash);
1243 spin_unlock_irqrestore(&vp->lock, flags);
1244
1245 vnet_port_free_tx_bufs(port);
1246 vio_ldc_free(&port->vio);
1247
1248 dev_set_drvdata(&vdev->dev, NULL);
1249
1250 kfree(port);
1251 }
1252 return 0;
1253 }
1254
1255 static const struct vio_device_id vnet_port_match[] = {
1256 {
1257 .type = "vnet-port",
1258 },
1259 {},
1260 };
1261 MODULE_DEVICE_TABLE(vio, vnet_port_match);
1262
1263 static struct vio_driver vnet_port_driver = {
1264 .id_table = vnet_port_match,
1265 .probe = vnet_port_probe,
1266 .remove = vnet_port_remove,
1267 .driver = {
1268 .name = "vnet_port",
1269 .owner = THIS_MODULE,
1270 }
1271 };
1272
1273 static int __init vnet_init(void)
1274 {
1275 return vio_register_driver(&vnet_port_driver);
1276 }
1277
1278 static void __exit vnet_exit(void)
1279 {
1280 vio_unregister_driver(&vnet_port_driver);
1281 }
1282
1283 module_init(vnet_init);
1284 module_exit(vnet_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree