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Merge branches 'x86-build-for-linus', 'x86-cleanups-for-linus' and 'x86-debug-for...
[deliverable/linux.git] / drivers / net / ethernet / sun / sunvnet.c
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 #include <linux/if_vlan.h>
19
20 #if IS_ENABLED(CONFIG_IPV6)
21 #include <linux/icmpv6.h>
22 #endif
23
24 #include <net/icmp.h>
25 #include <net/route.h>
26
27 #include <asm/vio.h>
28 #include <asm/ldc.h>
29
30 #include "sunvnet.h"
31
32 #define DRV_MODULE_NAME "sunvnet"
33 #define DRV_MODULE_VERSION "1.0"
34 #define DRV_MODULE_RELDATE "June 25, 2007"
35
36 static char version[] =
37 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
38 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
39 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
40 MODULE_LICENSE("GPL");
41 MODULE_VERSION(DRV_MODULE_VERSION);
42
43 /* Heuristic for the number of times to exponentially backoff and
44 * retry sending an LDC trigger when EAGAIN is encountered
45 */
46 #define VNET_MAX_RETRIES 10
47
48 static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
49
50 /* Ordered from largest major to lowest */
51 static struct vio_version vnet_versions[] = {
52 { .major = 1, .minor = 6 },
53 { .major = 1, .minor = 0 },
54 };
55
56 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
57 {
58 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
59 }
60
61 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
62 {
63 struct vio_msg_tag *pkt = arg;
64
65 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
66 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
67 pr_err("Resetting connection\n");
68
69 ldc_disconnect(port->vio.lp);
70
71 return -ECONNRESET;
72 }
73
74 static int vnet_send_attr(struct vio_driver_state *vio)
75 {
76 struct vnet_port *port = to_vnet_port(vio);
77 struct net_device *dev = port->vp->dev;
78 struct vio_net_attr_info pkt;
79 int framelen = ETH_FRAME_LEN;
80 int i;
81
82 memset(&pkt, 0, sizeof(pkt));
83 pkt.tag.type = VIO_TYPE_CTRL;
84 pkt.tag.stype = VIO_SUBTYPE_INFO;
85 pkt.tag.stype_env = VIO_ATTR_INFO;
86 pkt.tag.sid = vio_send_sid(vio);
87 if (vio_version_before(vio, 1, 2))
88 pkt.xfer_mode = VIO_DRING_MODE;
89 else
90 pkt.xfer_mode = VIO_NEW_DRING_MODE;
91 pkt.addr_type = VNET_ADDR_ETHERMAC;
92 pkt.ack_freq = 0;
93 for (i = 0; i < 6; i++)
94 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
95 if (vio_version_after(vio, 1, 3)) {
96 if (port->rmtu) {
97 port->rmtu = min(VNET_MAXPACKET, port->rmtu);
98 pkt.mtu = port->rmtu;
99 } else {
100 port->rmtu = VNET_MAXPACKET;
101 pkt.mtu = port->rmtu;
102 }
103 if (vio_version_after_eq(vio, 1, 6))
104 pkt.options = VIO_TX_DRING;
105 } else if (vio_version_before(vio, 1, 3)) {
106 pkt.mtu = framelen;
107 } else { /* v1.3 */
108 pkt.mtu = framelen + VLAN_HLEN;
109 }
110
111 pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
112 pkt.cflags = 0;
113
114 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
115 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
116 "cflags[0x%04x] lso_max[%u]\n",
117 pkt.xfer_mode, pkt.addr_type,
118 (unsigned long long)pkt.addr,
119 pkt.ack_freq, pkt.plnk_updt, pkt.options,
120 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
121
122
123 return vio_ldc_send(vio, &pkt, sizeof(pkt));
124 }
125
126 static int handle_attr_info(struct vio_driver_state *vio,
127 struct vio_net_attr_info *pkt)
128 {
129 struct vnet_port *port = to_vnet_port(vio);
130 u64 localmtu;
131 u8 xfer_mode;
132
133 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
134 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
135 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
136 pkt->xfer_mode, pkt->addr_type,
137 (unsigned long long)pkt->addr,
138 pkt->ack_freq, pkt->plnk_updt, pkt->options,
139 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
140 pkt->ipv4_lso_maxlen);
141
142 pkt->tag.sid = vio_send_sid(vio);
143
144 xfer_mode = pkt->xfer_mode;
145 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
146 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
147 xfer_mode = VIO_NEW_DRING_MODE;
148
149 /* MTU negotiation:
150 * < v1.3 - ETH_FRAME_LEN exactly
151 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
152 * pkt->mtu for ACK
153 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
154 */
155 if (vio_version_before(vio, 1, 3)) {
156 localmtu = ETH_FRAME_LEN;
157 } else if (vio_version_after(vio, 1, 3)) {
158 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
159 localmtu = min(pkt->mtu, localmtu);
160 pkt->mtu = localmtu;
161 } else { /* v1.3 */
162 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
163 }
164 port->rmtu = localmtu;
165
166 /* for version >= 1.6, ACK packet mode we support */
167 if (vio_version_after_eq(vio, 1, 6)) {
168 pkt->xfer_mode = VIO_NEW_DRING_MODE;
169 pkt->options = VIO_TX_DRING;
170 }
171
172 if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
173 pkt->addr_type != VNET_ADDR_ETHERMAC ||
174 pkt->mtu != localmtu) {
175 viodbg(HS, "SEND NET ATTR NACK\n");
176
177 pkt->tag.stype = VIO_SUBTYPE_NACK;
178
179 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
180
181 return -ECONNRESET;
182 } else {
183 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
184 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
185 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
186 pkt->xfer_mode, pkt->addr_type,
187 (unsigned long long)pkt->addr,
188 pkt->ack_freq, pkt->plnk_updt, pkt->options,
189 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
190 pkt->ipv4_lso_maxlen);
191
192 pkt->tag.stype = VIO_SUBTYPE_ACK;
193
194 return vio_ldc_send(vio, pkt, sizeof(*pkt));
195 }
196
197 }
198
199 static int handle_attr_ack(struct vio_driver_state *vio,
200 struct vio_net_attr_info *pkt)
201 {
202 viodbg(HS, "GOT NET ATTR ACK\n");
203
204 return 0;
205 }
206
207 static int handle_attr_nack(struct vio_driver_state *vio,
208 struct vio_net_attr_info *pkt)
209 {
210 viodbg(HS, "GOT NET ATTR NACK\n");
211
212 return -ECONNRESET;
213 }
214
215 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
216 {
217 struct vio_net_attr_info *pkt = arg;
218
219 switch (pkt->tag.stype) {
220 case VIO_SUBTYPE_INFO:
221 return handle_attr_info(vio, pkt);
222
223 case VIO_SUBTYPE_ACK:
224 return handle_attr_ack(vio, pkt);
225
226 case VIO_SUBTYPE_NACK:
227 return handle_attr_nack(vio, pkt);
228
229 default:
230 return -ECONNRESET;
231 }
232 }
233
234 static void vnet_handshake_complete(struct vio_driver_state *vio)
235 {
236 struct vio_dring_state *dr;
237
238 dr = &vio->drings[VIO_DRIVER_RX_RING];
239 dr->snd_nxt = dr->rcv_nxt = 1;
240
241 dr = &vio->drings[VIO_DRIVER_TX_RING];
242 dr->snd_nxt = dr->rcv_nxt = 1;
243 }
244
245 /* The hypervisor interface that implements copying to/from imported
246 * memory from another domain requires that copies are done to 8-byte
247 * aligned buffers, and that the lengths of such copies are also 8-byte
248 * multiples.
249 *
250 * So we align skb->data to an 8-byte multiple and pad-out the data
251 * area so we can round the copy length up to the next multiple of
252 * 8 for the copy.
253 *
254 * The transmitter puts the actual start of the packet 6 bytes into
255 * the buffer it sends over, so that the IP headers after the ethernet
256 * header are aligned properly. These 6 bytes are not in the descriptor
257 * length, they are simply implied. This offset is represented using
258 * the VNET_PACKET_SKIP macro.
259 */
260 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
261 unsigned int len)
262 {
263 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
264 unsigned long addr, off;
265
266 if (unlikely(!skb))
267 return NULL;
268
269 addr = (unsigned long) skb->data;
270 off = ((addr + 7UL) & ~7UL) - addr;
271 if (off)
272 skb_reserve(skb, off);
273
274 return skb;
275 }
276
277 static int vnet_rx_one(struct vnet_port *port, unsigned int len,
278 struct ldc_trans_cookie *cookies, int ncookies)
279 {
280 struct net_device *dev = port->vp->dev;
281 unsigned int copy_len;
282 struct sk_buff *skb;
283 int err;
284
285 err = -EMSGSIZE;
286 if (unlikely(len < ETH_ZLEN || len > port->rmtu)) {
287 dev->stats.rx_length_errors++;
288 goto out_dropped;
289 }
290
291 skb = alloc_and_align_skb(dev, len);
292 err = -ENOMEM;
293 if (unlikely(!skb)) {
294 dev->stats.rx_missed_errors++;
295 goto out_dropped;
296 }
297
298 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
299 skb_put(skb, copy_len);
300 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
301 skb->data, copy_len, 0,
302 cookies, ncookies);
303 if (unlikely(err < 0)) {
304 dev->stats.rx_frame_errors++;
305 goto out_free_skb;
306 }
307
308 skb_pull(skb, VNET_PACKET_SKIP);
309 skb_trim(skb, len);
310 skb->protocol = eth_type_trans(skb, dev);
311
312 dev->stats.rx_packets++;
313 dev->stats.rx_bytes += len;
314
315 netif_rx(skb);
316
317 return 0;
318
319 out_free_skb:
320 kfree_skb(skb);
321
322 out_dropped:
323 dev->stats.rx_dropped++;
324 return err;
325 }
326
327 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
328 u32 start, u32 end, u8 vio_dring_state)
329 {
330 struct vio_dring_data hdr = {
331 .tag = {
332 .type = VIO_TYPE_DATA,
333 .stype = VIO_SUBTYPE_ACK,
334 .stype_env = VIO_DRING_DATA,
335 .sid = vio_send_sid(&port->vio),
336 },
337 .dring_ident = dr->ident,
338 .start_idx = start,
339 .end_idx = end,
340 .state = vio_dring_state,
341 };
342 int err, delay;
343 int retries = 0;
344
345 hdr.seq = dr->snd_nxt;
346 delay = 1;
347 do {
348 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
349 if (err > 0) {
350 dr->snd_nxt++;
351 break;
352 }
353 udelay(delay);
354 if ((delay <<= 1) > 128)
355 delay = 128;
356 if (retries++ > VNET_MAX_RETRIES) {
357 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
358 port->raddr[0], port->raddr[1],
359 port->raddr[2], port->raddr[3],
360 port->raddr[4], port->raddr[5]);
361 break;
362 }
363 } while (err == -EAGAIN);
364
365 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
366 port->stop_rx_idx = end;
367 port->stop_rx = true;
368 } else {
369 port->stop_rx_idx = 0;
370 port->stop_rx = false;
371 }
372
373 return err;
374 }
375
376 static u32 next_idx(u32 idx, struct vio_dring_state *dr)
377 {
378 if (++idx == dr->num_entries)
379 idx = 0;
380 return idx;
381 }
382
383 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
384 {
385 if (idx == 0)
386 idx = dr->num_entries - 1;
387 else
388 idx--;
389
390 return idx;
391 }
392
393 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
394 struct vio_dring_state *dr,
395 u32 index)
396 {
397 struct vio_net_desc *desc = port->vio.desc_buf;
398 int err;
399
400 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
401 (index * dr->entry_size),
402 dr->cookies, dr->ncookies);
403 if (err < 0)
404 return ERR_PTR(err);
405
406 return desc;
407 }
408
409 static int put_rx_desc(struct vnet_port *port,
410 struct vio_dring_state *dr,
411 struct vio_net_desc *desc,
412 u32 index)
413 {
414 int err;
415
416 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
417 (index * dr->entry_size),
418 dr->cookies, dr->ncookies);
419 if (err < 0)
420 return err;
421
422 return 0;
423 }
424
425 static int vnet_walk_rx_one(struct vnet_port *port,
426 struct vio_dring_state *dr,
427 u32 index, int *needs_ack)
428 {
429 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
430 struct vio_driver_state *vio = &port->vio;
431 int err;
432
433 if (IS_ERR(desc))
434 return PTR_ERR(desc);
435
436 if (desc->hdr.state != VIO_DESC_READY)
437 return 1;
438
439 rmb();
440
441 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
442 desc->hdr.state, desc->hdr.ack,
443 desc->size, desc->ncookies,
444 desc->cookies[0].cookie_addr,
445 desc->cookies[0].cookie_size);
446
447 err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
448 if (err == -ECONNRESET)
449 return err;
450 desc->hdr.state = VIO_DESC_DONE;
451 err = put_rx_desc(port, dr, desc, index);
452 if (err < 0)
453 return err;
454 *needs_ack = desc->hdr.ack;
455 return 0;
456 }
457
458 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
459 u32 start, u32 end)
460 {
461 struct vio_driver_state *vio = &port->vio;
462 int ack_start = -1, ack_end = -1;
463
464 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
465
466 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
467
468 while (start != end) {
469 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
470 if (err == -ECONNRESET)
471 return err;
472 if (err != 0)
473 break;
474 if (ack_start == -1)
475 ack_start = start;
476 ack_end = start;
477 start = next_idx(start, dr);
478 if (ack && start != end) {
479 err = vnet_send_ack(port, dr, ack_start, ack_end,
480 VIO_DRING_ACTIVE);
481 if (err == -ECONNRESET)
482 return err;
483 ack_start = -1;
484 }
485 }
486 if (unlikely(ack_start == -1))
487 ack_start = ack_end = prev_idx(start, dr);
488 return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
489 }
490
491 static int vnet_rx(struct vnet_port *port, void *msgbuf)
492 {
493 struct vio_dring_data *pkt = msgbuf;
494 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
495 struct vio_driver_state *vio = &port->vio;
496
497 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
498 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
499
500 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
501 return 0;
502 if (unlikely(pkt->seq != dr->rcv_nxt)) {
503 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
504 pkt->seq, dr->rcv_nxt);
505 return 0;
506 }
507
508 dr->rcv_nxt++;
509
510 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
511
512 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
513 }
514
515 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
516 {
517 u32 idx = dr->cons;
518 int found = 0;
519
520 while (idx != dr->prod) {
521 if (idx == end) {
522 found = 1;
523 break;
524 }
525 idx = next_idx(idx, dr);
526 }
527 return found;
528 }
529
530 static int vnet_ack(struct vnet_port *port, void *msgbuf)
531 {
532 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
533 struct vio_dring_data *pkt = msgbuf;
534 struct net_device *dev;
535 struct vnet *vp;
536 u32 end;
537 struct vio_net_desc *desc;
538 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
539 return 0;
540
541 end = pkt->end_idx;
542 if (unlikely(!idx_is_pending(dr, end)))
543 return 0;
544
545 /* sync for race conditions with vnet_start_xmit() and tell xmit it
546 * is time to send a trigger.
547 */
548 dr->cons = next_idx(end, dr);
549 desc = vio_dring_entry(dr, dr->cons);
550 if (desc->hdr.state == VIO_DESC_READY && port->start_cons) {
551 /* vnet_start_xmit() just populated this dring but missed
552 * sending the "start" LDC message to the consumer.
553 * Send a "start" trigger on its behalf.
554 */
555 if (__vnet_tx_trigger(port, dr->cons) > 0)
556 port->start_cons = false;
557 else
558 port->start_cons = true;
559 } else {
560 port->start_cons = true;
561 }
562
563
564 vp = port->vp;
565 dev = vp->dev;
566 if (unlikely(netif_queue_stopped(dev) &&
567 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
568 return 1;
569
570 return 0;
571 }
572
573 static int vnet_nack(struct vnet_port *port, void *msgbuf)
574 {
575 /* XXX just reset or similar XXX */
576 return 0;
577 }
578
579 static int handle_mcast(struct vnet_port *port, void *msgbuf)
580 {
581 struct vio_net_mcast_info *pkt = msgbuf;
582
583 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
584 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
585 port->vp->dev->name,
586 pkt->tag.type,
587 pkt->tag.stype,
588 pkt->tag.stype_env,
589 pkt->tag.sid);
590
591 return 0;
592 }
593
594 static void maybe_tx_wakeup(unsigned long param)
595 {
596 struct vnet *vp = (struct vnet *)param;
597 struct net_device *dev = vp->dev;
598
599 netif_tx_lock(dev);
600 if (likely(netif_queue_stopped(dev))) {
601 struct vnet_port *port;
602 int wake = 1;
603
604 list_for_each_entry(port, &vp->port_list, list) {
605 struct vio_dring_state *dr;
606
607 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
608 if (vnet_tx_dring_avail(dr) <
609 VNET_TX_WAKEUP_THRESH(dr)) {
610 wake = 0;
611 break;
612 }
613 }
614 if (wake)
615 netif_wake_queue(dev);
616 }
617 netif_tx_unlock(dev);
618 }
619
620 static void vnet_event(void *arg, int event)
621 {
622 struct vnet_port *port = arg;
623 struct vio_driver_state *vio = &port->vio;
624 unsigned long flags;
625 int tx_wakeup, err;
626
627 spin_lock_irqsave(&vio->lock, flags);
628
629 if (unlikely(event == LDC_EVENT_RESET ||
630 event == LDC_EVENT_UP)) {
631 vio_link_state_change(vio, event);
632 spin_unlock_irqrestore(&vio->lock, flags);
633
634 if (event == LDC_EVENT_RESET) {
635 port->rmtu = 0;
636 vio_port_up(vio);
637 }
638 return;
639 }
640
641 if (unlikely(event != LDC_EVENT_DATA_READY)) {
642 pr_warn("Unexpected LDC event %d\n", event);
643 spin_unlock_irqrestore(&vio->lock, flags);
644 return;
645 }
646
647 tx_wakeup = err = 0;
648 while (1) {
649 union {
650 struct vio_msg_tag tag;
651 u64 raw[8];
652 } msgbuf;
653
654 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
655 if (unlikely(err < 0)) {
656 if (err == -ECONNRESET)
657 vio_conn_reset(vio);
658 break;
659 }
660 if (err == 0)
661 break;
662 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
663 msgbuf.tag.type,
664 msgbuf.tag.stype,
665 msgbuf.tag.stype_env,
666 msgbuf.tag.sid);
667 err = vio_validate_sid(vio, &msgbuf.tag);
668 if (err < 0)
669 break;
670
671 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
672 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
673 err = vnet_rx(port, &msgbuf);
674 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
675 err = vnet_ack(port, &msgbuf);
676 if (err > 0)
677 tx_wakeup |= err;
678 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
679 err = vnet_nack(port, &msgbuf);
680 }
681 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
682 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
683 err = handle_mcast(port, &msgbuf);
684 else
685 err = vio_control_pkt_engine(vio, &msgbuf);
686 if (err)
687 break;
688 } else {
689 err = vnet_handle_unknown(port, &msgbuf);
690 }
691 if (err == -ECONNRESET)
692 break;
693 }
694 spin_unlock(&vio->lock);
695 /* Kick off a tasklet to wake the queue. We cannot call
696 * maybe_tx_wakeup directly here because we could deadlock on
697 * netif_tx_lock() with dev_watchdog()
698 */
699 if (unlikely(tx_wakeup && err != -ECONNRESET))
700 tasklet_schedule(&port->vp->vnet_tx_wakeup);
701
702 local_irq_restore(flags);
703 }
704
705 static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
706 {
707 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
708 struct vio_dring_data hdr = {
709 .tag = {
710 .type = VIO_TYPE_DATA,
711 .stype = VIO_SUBTYPE_INFO,
712 .stype_env = VIO_DRING_DATA,
713 .sid = vio_send_sid(&port->vio),
714 },
715 .dring_ident = dr->ident,
716 .start_idx = start,
717 .end_idx = (u32) -1,
718 };
719 int err, delay;
720 int retries = 0;
721
722 if (port->stop_rx) {
723 err = vnet_send_ack(port,
724 &port->vio.drings[VIO_DRIVER_RX_RING],
725 port->stop_rx_idx, -1,
726 VIO_DRING_STOPPED);
727 if (err <= 0)
728 return err;
729 }
730
731 hdr.seq = dr->snd_nxt;
732 delay = 1;
733 do {
734 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
735 if (err > 0) {
736 dr->snd_nxt++;
737 break;
738 }
739 udelay(delay);
740 if ((delay <<= 1) > 128)
741 delay = 128;
742 if (retries++ > VNET_MAX_RETRIES)
743 break;
744 } while (err == -EAGAIN);
745
746 return err;
747 }
748
749 static inline bool port_is_up(struct vnet_port *vnet)
750 {
751 struct vio_driver_state *vio = &vnet->vio;
752
753 return !!(vio->hs_state & VIO_HS_COMPLETE);
754 }
755
756 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
757 {
758 unsigned int hash = vnet_hashfn(skb->data);
759 struct hlist_head *hp = &vp->port_hash[hash];
760 struct vnet_port *port;
761
762 hlist_for_each_entry(port, hp, hash) {
763 if (!port_is_up(port))
764 continue;
765 if (ether_addr_equal(port->raddr, skb->data))
766 return port;
767 }
768 list_for_each_entry(port, &vp->port_list, list) {
769 if (!port->switch_port)
770 continue;
771 if (!port_is_up(port))
772 continue;
773 return port;
774 }
775 return NULL;
776 }
777
778 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
779 {
780 struct vnet_port *ret;
781 unsigned long flags;
782
783 spin_lock_irqsave(&vp->lock, flags);
784 ret = __tx_port_find(vp, skb);
785 spin_unlock_irqrestore(&vp->lock, flags);
786
787 return ret;
788 }
789
790 static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
791 unsigned *pending)
792 {
793 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
794 struct sk_buff *skb = NULL;
795 int i, txi;
796
797 *pending = 0;
798
799 txi = dr->prod-1;
800 if (txi < 0)
801 txi = VNET_TX_RING_SIZE-1;
802
803 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
804 struct vio_net_desc *d;
805
806 d = vio_dring_entry(dr, txi);
807
808 if (d->hdr.state == VIO_DESC_DONE) {
809 if (port->tx_bufs[txi].skb) {
810 BUG_ON(port->tx_bufs[txi].skb->next);
811
812 port->tx_bufs[txi].skb->next = skb;
813 skb = port->tx_bufs[txi].skb;
814 port->tx_bufs[txi].skb = NULL;
815
816 ldc_unmap(port->vio.lp,
817 port->tx_bufs[txi].cookies,
818 port->tx_bufs[txi].ncookies);
819 }
820 d->hdr.state = VIO_DESC_FREE;
821 } else if (d->hdr.state == VIO_DESC_READY) {
822 (*pending)++;
823 } else if (d->hdr.state == VIO_DESC_FREE) {
824 break;
825 }
826 --txi;
827 if (txi < 0)
828 txi = VNET_TX_RING_SIZE-1;
829 }
830 return skb;
831 }
832
833 static inline void vnet_free_skbs(struct sk_buff *skb)
834 {
835 struct sk_buff *next;
836
837 while (skb) {
838 next = skb->next;
839 skb->next = NULL;
840 dev_kfree_skb(skb);
841 skb = next;
842 }
843 }
844
845 static void vnet_clean_timer_expire(unsigned long port0)
846 {
847 struct vnet_port *port = (struct vnet_port *)port0;
848 struct sk_buff *freeskbs;
849 unsigned pending;
850 unsigned long flags;
851
852 spin_lock_irqsave(&port->vio.lock, flags);
853 freeskbs = vnet_clean_tx_ring(port, &pending);
854 spin_unlock_irqrestore(&port->vio.lock, flags);
855
856 vnet_free_skbs(freeskbs);
857
858 if (pending)
859 (void)mod_timer(&port->clean_timer,
860 jiffies + VNET_CLEAN_TIMEOUT);
861 else
862 del_timer(&port->clean_timer);
863 }
864
865 static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, void **pstart,
866 int *plen)
867 {
868 struct sk_buff *nskb;
869 int len, pad;
870
871 len = skb->len;
872 pad = 0;
873 if (len < ETH_ZLEN) {
874 pad += ETH_ZLEN - skb->len;
875 len += pad;
876 }
877 len += VNET_PACKET_SKIP;
878 pad += 8 - (len & 7);
879 len += 8 - (len & 7);
880
881 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
882 skb_tailroom(skb) < pad ||
883 skb_headroom(skb) < VNET_PACKET_SKIP) {
884 nskb = alloc_and_align_skb(skb->dev, skb->len);
885 skb_reserve(nskb, VNET_PACKET_SKIP);
886 if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
887 dev_kfree_skb(nskb);
888 dev_kfree_skb(skb);
889 return NULL;
890 }
891 (void)skb_put(nskb, skb->len);
892 dev_kfree_skb(skb);
893 skb = nskb;
894 }
895
896 *pstart = skb->data - VNET_PACKET_SKIP;
897 *plen = len;
898 return skb;
899 }
900
901 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
902 {
903 struct vnet *vp = netdev_priv(dev);
904 struct vnet_port *port = tx_port_find(vp, skb);
905 struct vio_dring_state *dr;
906 struct vio_net_desc *d;
907 unsigned long flags;
908 unsigned int len;
909 struct sk_buff *freeskbs = NULL;
910 int i, err, txi;
911 void *start = NULL;
912 int nlen = 0;
913 unsigned pending = 0;
914
915 if (unlikely(!port))
916 goto out_dropped;
917
918 skb = vnet_skb_shape(skb, &start, &nlen);
919
920 if (unlikely(!skb))
921 goto out_dropped;
922
923 if (skb->len > port->rmtu) {
924 unsigned long localmtu = port->rmtu - ETH_HLEN;
925
926 if (vio_version_after_eq(&port->vio, 1, 3))
927 localmtu -= VLAN_HLEN;
928
929 if (skb->protocol == htons(ETH_P_IP)) {
930 struct flowi4 fl4;
931 struct rtable *rt = NULL;
932
933 memset(&fl4, 0, sizeof(fl4));
934 fl4.flowi4_oif = dev->ifindex;
935 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
936 fl4.daddr = ip_hdr(skb)->daddr;
937 fl4.saddr = ip_hdr(skb)->saddr;
938
939 rt = ip_route_output_key(dev_net(dev), &fl4);
940 if (!IS_ERR(rt)) {
941 skb_dst_set(skb, &rt->dst);
942 icmp_send(skb, ICMP_DEST_UNREACH,
943 ICMP_FRAG_NEEDED,
944 htonl(localmtu));
945 }
946 }
947 #if IS_ENABLED(CONFIG_IPV6)
948 else if (skb->protocol == htons(ETH_P_IPV6))
949 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
950 #endif
951 goto out_dropped;
952 }
953
954 spin_lock_irqsave(&port->vio.lock, flags);
955
956 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
957 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
958 if (!netif_queue_stopped(dev)) {
959 netif_stop_queue(dev);
960
961 /* This is a hard error, log it. */
962 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
963 dev->stats.tx_errors++;
964 }
965 spin_unlock_irqrestore(&port->vio.lock, flags);
966 return NETDEV_TX_BUSY;
967 }
968
969 d = vio_dring_cur(dr);
970
971 txi = dr->prod;
972
973 freeskbs = vnet_clean_tx_ring(port, &pending);
974
975 BUG_ON(port->tx_bufs[txi].skb);
976
977 len = skb->len;
978 if (len < ETH_ZLEN)
979 len = ETH_ZLEN;
980
981 port->tx_bufs[txi].skb = skb;
982 skb = NULL;
983
984 err = ldc_map_single(port->vio.lp, start, nlen,
985 port->tx_bufs[txi].cookies, VNET_MAXCOOKIES,
986 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
987 if (err < 0) {
988 netdev_info(dev, "tx buffer map error %d\n", err);
989 goto out_dropped_unlock;
990 }
991 port->tx_bufs[txi].ncookies = err;
992
993 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
994 * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
995 * the protocol itself does not require it as long as the peer
996 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
997 *
998 * An ACK for every packet in the ring is expensive as the
999 * sending of LDC messages is slow and affects performance.
1000 */
1001 d->hdr.ack = VIO_ACK_DISABLE;
1002 d->size = len;
1003 d->ncookies = port->tx_bufs[txi].ncookies;
1004 for (i = 0; i < d->ncookies; i++)
1005 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1006
1007 /* This has to be a non-SMP write barrier because we are writing
1008 * to memory which is shared with the peer LDOM.
1009 */
1010 wmb();
1011
1012 d->hdr.state = VIO_DESC_READY;
1013
1014 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1015 * to notify the consumer that some descriptors are READY.
1016 * After that "start" trigger, no additional triggers are needed until
1017 * a DRING_STOPPED is received from the consumer. The dr->cons field
1018 * (set up by vnet_ack()) has the value of the next dring index
1019 * that has not yet been ack-ed. We send a "start" trigger here
1020 * if, and only if, start_cons is true (reset it afterward). Conversely,
1021 * vnet_ack() should check if the dring corresponding to cons
1022 * is marked READY, but start_cons was false.
1023 * If so, vnet_ack() should send out the missed "start" trigger.
1024 *
1025 * Note that the wmb() above makes sure the cookies et al. are
1026 * not globally visible before the VIO_DESC_READY, and that the
1027 * stores are ordered correctly by the compiler. The consumer will
1028 * not proceed until the VIO_DESC_READY is visible assuring that
1029 * the consumer does not observe anything related to descriptors
1030 * out of order. The HV trap from the LDC start trigger is the
1031 * producer to consumer announcement that work is available to the
1032 * consumer
1033 */
1034 if (!port->start_cons)
1035 goto ldc_start_done; /* previous trigger suffices */
1036
1037 err = __vnet_tx_trigger(port, dr->cons);
1038 if (unlikely(err < 0)) {
1039 netdev_info(dev, "TX trigger error %d\n", err);
1040 d->hdr.state = VIO_DESC_FREE;
1041 dev->stats.tx_carrier_errors++;
1042 goto out_dropped_unlock;
1043 }
1044
1045 ldc_start_done:
1046 port->start_cons = false;
1047
1048 dev->stats.tx_packets++;
1049 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1050
1051 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1052 if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1053 netif_stop_queue(dev);
1054 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1055 netif_wake_queue(dev);
1056 }
1057
1058 spin_unlock_irqrestore(&port->vio.lock, flags);
1059
1060 vnet_free_skbs(freeskbs);
1061
1062 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1063
1064 return NETDEV_TX_OK;
1065
1066 out_dropped_unlock:
1067 spin_unlock_irqrestore(&port->vio.lock, flags);
1068
1069 out_dropped:
1070 if (skb)
1071 dev_kfree_skb(skb);
1072 vnet_free_skbs(freeskbs);
1073 if (pending)
1074 (void)mod_timer(&port->clean_timer,
1075 jiffies + VNET_CLEAN_TIMEOUT);
1076 else if (port)
1077 del_timer(&port->clean_timer);
1078 dev->stats.tx_dropped++;
1079 return NETDEV_TX_OK;
1080 }
1081
1082 static void vnet_tx_timeout(struct net_device *dev)
1083 {
1084 /* XXX Implement me XXX */
1085 }
1086
1087 static int vnet_open(struct net_device *dev)
1088 {
1089 netif_carrier_on(dev);
1090 netif_start_queue(dev);
1091
1092 return 0;
1093 }
1094
1095 static int vnet_close(struct net_device *dev)
1096 {
1097 netif_stop_queue(dev);
1098 netif_carrier_off(dev);
1099
1100 return 0;
1101 }
1102
1103 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1104 {
1105 struct vnet_mcast_entry *m;
1106
1107 for (m = vp->mcast_list; m; m = m->next) {
1108 if (ether_addr_equal(m->addr, addr))
1109 return m;
1110 }
1111 return NULL;
1112 }
1113
1114 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1115 {
1116 struct netdev_hw_addr *ha;
1117
1118 netdev_for_each_mc_addr(ha, dev) {
1119 struct vnet_mcast_entry *m;
1120
1121 m = __vnet_mc_find(vp, ha->addr);
1122 if (m) {
1123 m->hit = 1;
1124 continue;
1125 }
1126
1127 if (!m) {
1128 m = kzalloc(sizeof(*m), GFP_ATOMIC);
1129 if (!m)
1130 continue;
1131 memcpy(m->addr, ha->addr, ETH_ALEN);
1132 m->hit = 1;
1133
1134 m->next = vp->mcast_list;
1135 vp->mcast_list = m;
1136 }
1137 }
1138 }
1139
1140 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1141 {
1142 struct vio_net_mcast_info info;
1143 struct vnet_mcast_entry *m, **pp;
1144 int n_addrs;
1145
1146 memset(&info, 0, sizeof(info));
1147
1148 info.tag.type = VIO_TYPE_CTRL;
1149 info.tag.stype = VIO_SUBTYPE_INFO;
1150 info.tag.stype_env = VNET_MCAST_INFO;
1151 info.tag.sid = vio_send_sid(&port->vio);
1152 info.set = 1;
1153
1154 n_addrs = 0;
1155 for (m = vp->mcast_list; m; m = m->next) {
1156 if (m->sent)
1157 continue;
1158 m->sent = 1;
1159 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1160 m->addr, ETH_ALEN);
1161 if (++n_addrs == VNET_NUM_MCAST) {
1162 info.count = n_addrs;
1163
1164 (void) vio_ldc_send(&port->vio, &info,
1165 sizeof(info));
1166 n_addrs = 0;
1167 }
1168 }
1169 if (n_addrs) {
1170 info.count = n_addrs;
1171 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1172 }
1173
1174 info.set = 0;
1175
1176 n_addrs = 0;
1177 pp = &vp->mcast_list;
1178 while ((m = *pp) != NULL) {
1179 if (m->hit) {
1180 m->hit = 0;
1181 pp = &m->next;
1182 continue;
1183 }
1184
1185 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1186 m->addr, ETH_ALEN);
1187 if (++n_addrs == VNET_NUM_MCAST) {
1188 info.count = n_addrs;
1189 (void) vio_ldc_send(&port->vio, &info,
1190 sizeof(info));
1191 n_addrs = 0;
1192 }
1193
1194 *pp = m->next;
1195 kfree(m);
1196 }
1197 if (n_addrs) {
1198 info.count = n_addrs;
1199 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1200 }
1201 }
1202
1203 static void vnet_set_rx_mode(struct net_device *dev)
1204 {
1205 struct vnet *vp = netdev_priv(dev);
1206 struct vnet_port *port;
1207 unsigned long flags;
1208
1209 spin_lock_irqsave(&vp->lock, flags);
1210 if (!list_empty(&vp->port_list)) {
1211 port = list_entry(vp->port_list.next, struct vnet_port, list);
1212
1213 if (port->switch_port) {
1214 __update_mc_list(vp, dev);
1215 __send_mc_list(vp, port);
1216 }
1217 }
1218 spin_unlock_irqrestore(&vp->lock, flags);
1219 }
1220
1221 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
1222 {
1223 if (new_mtu < 68 || new_mtu > 65535)
1224 return -EINVAL;
1225
1226 dev->mtu = new_mtu;
1227 return 0;
1228 }
1229
1230 static int vnet_set_mac_addr(struct net_device *dev, void *p)
1231 {
1232 return -EINVAL;
1233 }
1234
1235 static void vnet_get_drvinfo(struct net_device *dev,
1236 struct ethtool_drvinfo *info)
1237 {
1238 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
1239 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
1240 }
1241
1242 static u32 vnet_get_msglevel(struct net_device *dev)
1243 {
1244 struct vnet *vp = netdev_priv(dev);
1245 return vp->msg_enable;
1246 }
1247
1248 static void vnet_set_msglevel(struct net_device *dev, u32 value)
1249 {
1250 struct vnet *vp = netdev_priv(dev);
1251 vp->msg_enable = value;
1252 }
1253
1254 static const struct ethtool_ops vnet_ethtool_ops = {
1255 .get_drvinfo = vnet_get_drvinfo,
1256 .get_msglevel = vnet_get_msglevel,
1257 .set_msglevel = vnet_set_msglevel,
1258 .get_link = ethtool_op_get_link,
1259 };
1260
1261 static void vnet_port_free_tx_bufs(struct vnet_port *port)
1262 {
1263 struct vio_dring_state *dr;
1264 int i;
1265
1266 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1267 if (dr->base) {
1268 ldc_free_exp_dring(port->vio.lp, dr->base,
1269 (dr->entry_size * dr->num_entries),
1270 dr->cookies, dr->ncookies);
1271 dr->base = NULL;
1272 dr->entry_size = 0;
1273 dr->num_entries = 0;
1274 dr->pending = 0;
1275 dr->ncookies = 0;
1276 }
1277
1278 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1279 struct vio_net_desc *d;
1280 void *skb = port->tx_bufs[i].skb;
1281
1282 if (!skb)
1283 continue;
1284
1285 d = vio_dring_entry(dr, i);
1286 if (d->hdr.state == VIO_DESC_READY)
1287 pr_warn("active transmit buffers freed\n");
1288
1289 ldc_unmap(port->vio.lp,
1290 port->tx_bufs[i].cookies,
1291 port->tx_bufs[i].ncookies);
1292 dev_kfree_skb(skb);
1293 port->tx_bufs[i].skb = NULL;
1294 d->hdr.state = VIO_DESC_FREE;
1295 }
1296 }
1297
1298 static int vnet_port_alloc_tx_bufs(struct vnet_port *port)
1299 {
1300 struct vio_dring_state *dr;
1301 unsigned long len;
1302 int i, err, ncookies;
1303 void *dring;
1304
1305 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1306
1307 len = (VNET_TX_RING_SIZE *
1308 (sizeof(struct vio_net_desc) +
1309 (sizeof(struct ldc_trans_cookie) * 2)));
1310
1311 ncookies = VIO_MAX_RING_COOKIES;
1312 dring = ldc_alloc_exp_dring(port->vio.lp, len,
1313 dr->cookies, &ncookies,
1314 (LDC_MAP_SHADOW |
1315 LDC_MAP_DIRECT |
1316 LDC_MAP_RW));
1317 if (IS_ERR(dring)) {
1318 err = PTR_ERR(dring);
1319 goto err_out;
1320 }
1321
1322 dr->base = dring;
1323 dr->entry_size = (sizeof(struct vio_net_desc) +
1324 (sizeof(struct ldc_trans_cookie) * 2));
1325 dr->num_entries = VNET_TX_RING_SIZE;
1326 dr->prod = dr->cons = 0;
1327 port->start_cons = true; /* need an initial trigger */
1328 dr->pending = VNET_TX_RING_SIZE;
1329 dr->ncookies = ncookies;
1330
1331 for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1332 struct vio_net_desc *d;
1333
1334 d = vio_dring_entry(dr, i);
1335 d->hdr.state = VIO_DESC_FREE;
1336 }
1337 return 0;
1338
1339 err_out:
1340 vnet_port_free_tx_bufs(port);
1341
1342 return err;
1343 }
1344
1345 static LIST_HEAD(vnet_list);
1346 static DEFINE_MUTEX(vnet_list_mutex);
1347
1348 static const struct net_device_ops vnet_ops = {
1349 .ndo_open = vnet_open,
1350 .ndo_stop = vnet_close,
1351 .ndo_set_rx_mode = vnet_set_rx_mode,
1352 .ndo_set_mac_address = vnet_set_mac_addr,
1353 .ndo_validate_addr = eth_validate_addr,
1354 .ndo_tx_timeout = vnet_tx_timeout,
1355 .ndo_change_mtu = vnet_change_mtu,
1356 .ndo_start_xmit = vnet_start_xmit,
1357 };
1358
1359 static struct vnet *vnet_new(const u64 *local_mac)
1360 {
1361 struct net_device *dev;
1362 struct vnet *vp;
1363 int err, i;
1364
1365 dev = alloc_etherdev(sizeof(*vp));
1366 if (!dev)
1367 return ERR_PTR(-ENOMEM);
1368 dev->needed_headroom = VNET_PACKET_SKIP + 8;
1369 dev->needed_tailroom = 8;
1370
1371 for (i = 0; i < ETH_ALEN; i++)
1372 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1373
1374 vp = netdev_priv(dev);
1375
1376 spin_lock_init(&vp->lock);
1377 tasklet_init(&vp->vnet_tx_wakeup, maybe_tx_wakeup, (unsigned long)vp);
1378 vp->dev = dev;
1379
1380 INIT_LIST_HEAD(&vp->port_list);
1381 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1382 INIT_HLIST_HEAD(&vp->port_hash[i]);
1383 INIT_LIST_HEAD(&vp->list);
1384 vp->local_mac = *local_mac;
1385
1386 dev->netdev_ops = &vnet_ops;
1387 dev->ethtool_ops = &vnet_ethtool_ops;
1388 dev->watchdog_timeo = VNET_TX_TIMEOUT;
1389
1390 err = register_netdev(dev);
1391 if (err) {
1392 pr_err("Cannot register net device, aborting\n");
1393 goto err_out_free_dev;
1394 }
1395
1396 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1397
1398 list_add(&vp->list, &vnet_list);
1399
1400 return vp;
1401
1402 err_out_free_dev:
1403 free_netdev(dev);
1404
1405 return ERR_PTR(err);
1406 }
1407
1408 static struct vnet *vnet_find_or_create(const u64 *local_mac)
1409 {
1410 struct vnet *iter, *vp;
1411
1412 mutex_lock(&vnet_list_mutex);
1413 vp = NULL;
1414 list_for_each_entry(iter, &vnet_list, list) {
1415 if (iter->local_mac == *local_mac) {
1416 vp = iter;
1417 break;
1418 }
1419 }
1420 if (!vp)
1421 vp = vnet_new(local_mac);
1422 mutex_unlock(&vnet_list_mutex);
1423
1424 return vp;
1425 }
1426
1427 static void vnet_cleanup(void)
1428 {
1429 struct vnet *vp;
1430 struct net_device *dev;
1431
1432 mutex_lock(&vnet_list_mutex);
1433 while (!list_empty(&vnet_list)) {
1434 vp = list_first_entry(&vnet_list, struct vnet, list);
1435 list_del(&vp->list);
1436 dev = vp->dev;
1437 tasklet_kill(&vp->vnet_tx_wakeup);
1438 /* vio_unregister_driver() should have cleaned up port_list */
1439 BUG_ON(!list_empty(&vp->port_list));
1440 unregister_netdev(dev);
1441 free_netdev(dev);
1442 }
1443 mutex_unlock(&vnet_list_mutex);
1444 }
1445
1446 static const char *local_mac_prop = "local-mac-address";
1447
1448 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1449 u64 port_node)
1450 {
1451 const u64 *local_mac = NULL;
1452 u64 a;
1453
1454 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1455 u64 target = mdesc_arc_target(hp, a);
1456 const char *name;
1457
1458 name = mdesc_get_property(hp, target, "name", NULL);
1459 if (!name || strcmp(name, "network"))
1460 continue;
1461
1462 local_mac = mdesc_get_property(hp, target,
1463 local_mac_prop, NULL);
1464 if (local_mac)
1465 break;
1466 }
1467 if (!local_mac)
1468 return ERR_PTR(-ENODEV);
1469
1470 return vnet_find_or_create(local_mac);
1471 }
1472
1473 static struct ldc_channel_config vnet_ldc_cfg = {
1474 .event = vnet_event,
1475 .mtu = 64,
1476 .mode = LDC_MODE_UNRELIABLE,
1477 };
1478
1479 static struct vio_driver_ops vnet_vio_ops = {
1480 .send_attr = vnet_send_attr,
1481 .handle_attr = vnet_handle_attr,
1482 .handshake_complete = vnet_handshake_complete,
1483 };
1484
1485 static void print_version(void)
1486 {
1487 printk_once(KERN_INFO "%s", version);
1488 }
1489
1490 const char *remote_macaddr_prop = "remote-mac-address";
1491
1492 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1493 {
1494 struct mdesc_handle *hp;
1495 struct vnet_port *port;
1496 unsigned long flags;
1497 struct vnet *vp;
1498 const u64 *rmac;
1499 int len, i, err, switch_port;
1500
1501 print_version();
1502
1503 hp = mdesc_grab();
1504
1505 vp = vnet_find_parent(hp, vdev->mp);
1506 if (IS_ERR(vp)) {
1507 pr_err("Cannot find port parent vnet\n");
1508 err = PTR_ERR(vp);
1509 goto err_out_put_mdesc;
1510 }
1511
1512 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1513 err = -ENODEV;
1514 if (!rmac) {
1515 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1516 goto err_out_put_mdesc;
1517 }
1518
1519 port = kzalloc(sizeof(*port), GFP_KERNEL);
1520 err = -ENOMEM;
1521 if (!port)
1522 goto err_out_put_mdesc;
1523
1524 for (i = 0; i < ETH_ALEN; i++)
1525 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1526
1527 port->vp = vp;
1528
1529 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1530 vnet_versions, ARRAY_SIZE(vnet_versions),
1531 &vnet_vio_ops, vp->dev->name);
1532 if (err)
1533 goto err_out_free_port;
1534
1535 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1536 if (err)
1537 goto err_out_free_port;
1538
1539 err = vnet_port_alloc_tx_bufs(port);
1540 if (err)
1541 goto err_out_free_ldc;
1542
1543 INIT_HLIST_NODE(&port->hash);
1544 INIT_LIST_HEAD(&port->list);
1545
1546 switch_port = 0;
1547 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1548 switch_port = 1;
1549 port->switch_port = switch_port;
1550
1551 spin_lock_irqsave(&vp->lock, flags);
1552 if (switch_port)
1553 list_add(&port->list, &vp->port_list);
1554 else
1555 list_add_tail(&port->list, &vp->port_list);
1556 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1557 spin_unlock_irqrestore(&vp->lock, flags);
1558
1559 dev_set_drvdata(&vdev->dev, port);
1560
1561 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1562 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1563
1564 setup_timer(&port->clean_timer, vnet_clean_timer_expire,
1565 (unsigned long)port);
1566
1567 vio_port_up(&port->vio);
1568
1569 mdesc_release(hp);
1570
1571 return 0;
1572
1573 err_out_free_ldc:
1574 vio_ldc_free(&port->vio);
1575
1576 err_out_free_port:
1577 kfree(port);
1578
1579 err_out_put_mdesc:
1580 mdesc_release(hp);
1581 return err;
1582 }
1583
1584 static int vnet_port_remove(struct vio_dev *vdev)
1585 {
1586 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1587
1588 if (port) {
1589 struct vnet *vp = port->vp;
1590 unsigned long flags;
1591
1592 del_timer_sync(&port->vio.timer);
1593 del_timer_sync(&port->clean_timer);
1594
1595 spin_lock_irqsave(&vp->lock, flags);
1596 list_del(&port->list);
1597 hlist_del(&port->hash);
1598 spin_unlock_irqrestore(&vp->lock, flags);
1599
1600 vnet_port_free_tx_bufs(port);
1601 vio_ldc_free(&port->vio);
1602
1603 dev_set_drvdata(&vdev->dev, NULL);
1604
1605 kfree(port);
1606
1607 }
1608 return 0;
1609 }
1610
1611 static const struct vio_device_id vnet_port_match[] = {
1612 {
1613 .type = "vnet-port",
1614 },
1615 {},
1616 };
1617 MODULE_DEVICE_TABLE(vio, vnet_port_match);
1618
1619 static struct vio_driver vnet_port_driver = {
1620 .id_table = vnet_port_match,
1621 .probe = vnet_port_probe,
1622 .remove = vnet_port_remove,
1623 .name = "vnet_port",
1624 };
1625
1626 static int __init vnet_init(void)
1627 {
1628 return vio_register_driver(&vnet_port_driver);
1629 }
1630
1631 static void __exit vnet_exit(void)
1632 {
1633 vio_unregister_driver(&vnet_port_driver);
1634 vnet_cleanup();
1635 }
1636
1637 module_init(vnet_init);
1638 module_exit(vnet_exit);
Linux kernel - Deliverables
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