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Merge tag 'linux-can-fixes-for-3.16-20140725' of git://gitorious.org/linux-can/linux-can
[deliverable/linux.git] / drivers / net / ethernet / sun / sunvnet.c
CommitLineData
4c521e42
DM		 1/* sunvnet.c: Sun LDOM Virtual Network Driver.
2 *
3d452e55 3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4c521e42
DM		 4 */
5
4d5870ec
JP		 6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
4c521e42
DM		 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>
9184a046 17#include <linux/mutex.h>
4c521e42
DM		 18
19#include <asm/vio.h>
20#include <asm/ldc.h>
21
22#include "sunvnet.h"
23
24#define DRV_MODULE_NAME "sunvnet"
4c521e42
DM		 25#define DRV_MODULE_VERSION "1.0"
26#define DRV_MODULE_RELDATE "June 25, 2007"
27
f73d12bd 28static char version[] =
4c521e42
DM		 29 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
30MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
31MODULE_DESCRIPTION("Sun LDOM virtual network driver");
32MODULE_LICENSE("GPL");
33MODULE_VERSION(DRV_MODULE_VERSION);
34
35/* Ordered from largest major to lowest */
36static struct vio_version vnet_versions[] = {
37 { .major = 1, .minor = 0 },
38};
39
40static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
41{
42 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
43}
44
45static int vnet_handle_unknown(struct vnet_port *port, void *arg)
46{
47 struct vio_msg_tag *pkt = arg;
48
4d5870ec 49 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
4c521e42 50 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
4d5870ec 51 pr_err("Resetting connection\n");
4c521e42
DM		 52
53 ldc_disconnect(port->vio.lp);
54
55 return -ECONNRESET;
56}
57
58static 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
87static 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
119static 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
127static 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
135static 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
154static 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 */
180static 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
197static 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
239out_free_skb:
240 kfree_skb(skb);
241
242out_dropped:
243 dev->stats.rx_dropped++;
244 return err;
245}
246
247static 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
280static 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
287static 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
297static 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
313static 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
329static 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
3f4528d6 340 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
4c521e42
DM		 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
359static 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
392static 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
3f4528d6 398 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
4c521e42
DM		 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)) {
4d5870ec
JP		 404 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
405 pkt->seq, dr->rcv_nxt);
4c521e42
DM		 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
416static 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
431static 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
457static int vnet_nack(struct vnet_port *port, void *msgbuf)
458{
459 /* XXX just reset or similar XXX */
460 return 0;
461}
462
028ebff2
DM		 463static 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)
4d5870ec 468 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
028ebff2
DM		 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
4c521e42
DM		 478static 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
503static 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
d762acdb
DM		 517 if (event == LDC_EVENT_RESET)
518 vio_port_up(vio);
4c521e42
DM		 519 return;
520 }
521
522 if (unlikely(event != LDC_EVENT_DATA_READY)) {
4d5870ec 523 pr_warning("Unexpected LDC event %d\n", event);
4c521e42
DM		 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) {
028ebff2
DM		 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);
4c521e42
DM		 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
581static 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
613struct 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];
4c521e42
DM		 617 struct vnet_port *port;
618
b67bfe0d 619 hlist_for_each_entry(port, hp, hash) {
2e42e474 620 if (ether_addr_equal(port->raddr, skb->data))
4c521e42
DM		 621 return port;
622 }
623 port = NULL;
624 if (!list_empty(&vp->port_list))
625 port = list_entry(vp->port_list.next, struct vnet_port, list);
626
627 return port;
628}
629
630struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
631{
632 struct vnet_port *ret;
633 unsigned long flags;
634
635 spin_lock_irqsave(&vp->lock, flags);
636 ret = __tx_port_find(vp, skb);
637 spin_unlock_irqrestore(&vp->lock, flags);
638
639 return ret;
640}
641
642static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
643{
644 struct vnet *vp = netdev_priv(dev);
645 struct vnet_port *port = tx_port_find(vp, skb);
646 struct vio_dring_state *dr;
647 struct vio_net_desc *d;
648 unsigned long flags;
649 unsigned int len;
650 void *tx_buf;
651 int i, err;
652
653 if (unlikely(!port))
654 goto out_dropped;
655
656 spin_lock_irqsave(&port->vio.lock, flags);
657
658 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
659 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
660 if (!netif_queue_stopped(dev)) {
661 netif_stop_queue(dev);
662
663 /* This is a hard error, log it. */
4d5870ec 664 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
4c521e42
DM		 665 dev->stats.tx_errors++;
666 }
667 spin_unlock_irqrestore(&port->vio.lock, flags);
668 return NETDEV_TX_BUSY;
669 }
670
671 d = vio_dring_cur(dr);
672
673 tx_buf = port->tx_bufs[dr->prod].buf;
674 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
675
676 len = skb->len;
677 if (len < ETH_ZLEN) {
678 len = ETH_ZLEN;
679 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
680 }
681
682 d->hdr.ack = VIO_ACK_ENABLE;
683 d->size = len;
684 d->ncookies = port->tx_bufs[dr->prod].ncookies;
685 for (i = 0; i < d->ncookies; i++)
686 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
687
688 /* This has to be a non-SMP write barrier because we are writing
689 * to memory which is shared with the peer LDOM.
690 */
691 wmb();
692
693 d->hdr.state = VIO_DESC_READY;
694
695 err = __vnet_tx_trigger(port);
696 if (unlikely(err < 0)) {
4d5870ec 697 netdev_info(dev, "TX trigger error %d\n", err);
4c521e42
DM		 698 d->hdr.state = VIO_DESC_FREE;
699 dev->stats.tx_carrier_errors++;
700 goto out_dropped_unlock;
701 }
702
703 dev->stats.tx_packets++;
704 dev->stats.tx_bytes += skb->len;
705
706 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
707 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
708 netif_stop_queue(dev);
709 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
710 netif_wake_queue(dev);
711 }
712
713 spin_unlock_irqrestore(&port->vio.lock, flags);
714
715 dev_kfree_skb(skb);
716
4c521e42
DM		 717 return NETDEV_TX_OK;
718
719out_dropped_unlock:
720 spin_unlock_irqrestore(&port->vio.lock, flags);
721
722out_dropped:
723 dev_kfree_skb(skb);
724 dev->stats.tx_dropped++;
725 return NETDEV_TX_OK;
726}
727
728static void vnet_tx_timeout(struct net_device *dev)
729{
730 /* XXX Implement me XXX */
731}
732
733static int vnet_open(struct net_device *dev)
734{
735 netif_carrier_on(dev);
736 netif_start_queue(dev);
737
738 return 0;
739}
740
741static int vnet_close(struct net_device *dev)
742{
743 netif_stop_queue(dev);
744 netif_carrier_off(dev);
745
746 return 0;
747}
748
028ebff2
DM		 749static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
750{
751 struct vnet_mcast_entry *m;
752
753 for (m = vp->mcast_list; m; m = m->next) {
00fa4ce9 754 if (ether_addr_equal(m->addr, addr))
028ebff2
DM		 755 return m;
756 }
757 return NULL;
758}
759
760static void __update_mc_list(struct vnet *vp, struct net_device *dev)
761{
22bedad3 762 struct netdev_hw_addr *ha;
028ebff2 763
22bedad3 764 netdev_for_each_mc_addr(ha, dev) {
028ebff2
DM		 765 struct vnet_mcast_entry *m;
766
22bedad3 767 m = __vnet_mc_find(vp, ha->addr);
028ebff2
DM		 768 if (m) {
769 m->hit = 1;
770 continue;
771 }
772
773 if (!m) {
774 m = kzalloc(sizeof(*m), GFP_ATOMIC);
775 if (!m)
776 continue;
22bedad3 777 memcpy(m->addr, ha->addr, ETH_ALEN);
028ebff2
DM		 778 m->hit = 1;
779
780 m->next = vp->mcast_list;
781 vp->mcast_list = m;
782 }
783 }
784}
785
786static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
787{
788 struct vio_net_mcast_info info;
789 struct vnet_mcast_entry *m, **pp;
790 int n_addrs;
791
792 memset(&info, 0, sizeof(info));
793
794 info.tag.type = VIO_TYPE_CTRL;
795 info.tag.stype = VIO_SUBTYPE_INFO;
796 info.tag.stype_env = VNET_MCAST_INFO;
797 info.tag.sid = vio_send_sid(&port->vio);
798 info.set = 1;
799
800 n_addrs = 0;
801 for (m = vp->mcast_list; m; m = m->next) {
802 if (m->sent)
803 continue;
804 m->sent = 1;
805 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
806 m->addr, ETH_ALEN);
807 if (++n_addrs == VNET_NUM_MCAST) {
808 info.count = n_addrs;
809
810 (void) vio_ldc_send(&port->vio, &info,
811 sizeof(info));
812 n_addrs = 0;
813 }
814 }
815 if (n_addrs) {
816 info.count = n_addrs;
817 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
818 }
819
820 info.set = 0;
821
822 n_addrs = 0;
823 pp = &vp->mcast_list;
824 while ((m = *pp) != NULL) {
825 if (m->hit) {
826 m->hit = 0;
827 pp = &m->next;
828 continue;
829 }
830
831 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
832 m->addr, ETH_ALEN);
833 if (++n_addrs == VNET_NUM_MCAST) {
834 info.count = n_addrs;
835 (void) vio_ldc_send(&port->vio, &info,
836 sizeof(info));
837 n_addrs = 0;
838 }
839
840 *pp = m->next;
841 kfree(m);
842 }
843 if (n_addrs) {
844 info.count = n_addrs;
845 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
846 }
847}
848
4c521e42
DM		 849static void vnet_set_rx_mode(struct net_device *dev)
850{
028ebff2
DM		 851 struct vnet *vp = netdev_priv(dev);
852 struct vnet_port *port;
853 unsigned long flags;
854
855 spin_lock_irqsave(&vp->lock, flags);
856 if (!list_empty(&vp->port_list)) {
857 port = list_entry(vp->port_list.next, struct vnet_port, list);
858
859 if (port->switch_port) {
860 __update_mc_list(vp, dev);
861 __send_mc_list(vp, port);
862 }
863 }
864 spin_unlock_irqrestore(&vp->lock, flags);
4c521e42
DM		 865}
866
867static int vnet_change_mtu(struct net_device *dev, int new_mtu)
868{
869 if (new_mtu != ETH_DATA_LEN)
870 return -EINVAL;
871
872 dev->mtu = new_mtu;
873 return 0;
874}
875
876static int vnet_set_mac_addr(struct net_device *dev, void *p)
877{
878 return -EINVAL;
879}
880
881static void vnet_get_drvinfo(struct net_device *dev,
882 struct ethtool_drvinfo *info)
883{
7826d43f
JP		 884 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
885 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
4c521e42
DM		 886}
887
888static u32 vnet_get_msglevel(struct net_device *dev)
889{
890 struct vnet *vp = netdev_priv(dev);
891 return vp->msg_enable;
892}
893
894static void vnet_set_msglevel(struct net_device *dev, u32 value)
895{
896 struct vnet *vp = netdev_priv(dev);
897 vp->msg_enable = value;
898}
899
900static const struct ethtool_ops vnet_ethtool_ops = {
901 .get_drvinfo = vnet_get_drvinfo,
902 .get_msglevel = vnet_get_msglevel,
903 .set_msglevel = vnet_set_msglevel,
904 .get_link = ethtool_op_get_link,
4c521e42
DM		 905};
906
907static void vnet_port_free_tx_bufs(struct vnet_port *port)
908{
909 struct vio_dring_state *dr;
910 int i;
911
912 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
913 if (dr->base) {
914 ldc_free_exp_dring(port->vio.lp, dr->base,
915 (dr->entry_size * dr->num_entries),
916 dr->cookies, dr->ncookies);
917 dr->base = NULL;
918 dr->entry_size = 0;
919 dr->num_entries = 0;
920 dr->pending = 0;
921 dr->ncookies = 0;
922 }
923
924 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
925 void *buf = port->tx_bufs[i].buf;
926
927 if (!buf)
928 continue;
929
930 ldc_unmap(port->vio.lp,
931 port->tx_bufs[i].cookies,
932 port->tx_bufs[i].ncookies);
933
934 kfree(buf);
935 port->tx_bufs[i].buf = NULL;
936 }
937}
938
f73d12bd 939static int vnet_port_alloc_tx_bufs(struct vnet_port *port)
4c521e42
DM		 940{
941 struct vio_dring_state *dr;
942 unsigned long len;
943 int i, err, ncookies;
944 void *dring;
945
946 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
947 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
948 int map_len = (ETH_FRAME_LEN + 7) & ~7;
949
950 err = -ENOMEM;
e404decb 951 if (!buf)
4c521e42 952 goto err_out;
e404decb 953
4c521e42
DM		 954 err = -EFAULT;
955 if ((unsigned long)buf & (8UL - 1)) {
4d5870ec 956 pr_err("TX buffer misaligned\n");
4c521e42
DM		 957 kfree(buf);
958 goto err_out;
959 }
960
961 err = ldc_map_single(port->vio.lp, buf, map_len,
962 port->tx_bufs[i].cookies, 2,
963 (LDC_MAP_SHADOW |
964 LDC_MAP_DIRECT |
965 LDC_MAP_RW));
966 if (err < 0) {
967 kfree(buf);
968 goto err_out;
969 }
970 port->tx_bufs[i].buf = buf;
971 port->tx_bufs[i].ncookies = err;
972 }
973
974 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
975
976 len = (VNET_TX_RING_SIZE *
977 (sizeof(struct vio_net_desc) +
978 (sizeof(struct ldc_trans_cookie) * 2)));
979
980 ncookies = VIO_MAX_RING_COOKIES;
981 dring = ldc_alloc_exp_dring(port->vio.lp, len,
982 dr->cookies, &ncookies,
983 (LDC_MAP_SHADOW |
984 LDC_MAP_DIRECT |
985 LDC_MAP_RW));
986 if (IS_ERR(dring)) {
987 err = PTR_ERR(dring);
988 goto err_out;
989 }
990
991 dr->base = dring;
992 dr->entry_size = (sizeof(struct vio_net_desc) +
993 (sizeof(struct ldc_trans_cookie) * 2));
994 dr->num_entries = VNET_TX_RING_SIZE;
995 dr->prod = dr->cons = 0;
996 dr->pending = VNET_TX_RING_SIZE;
997 dr->ncookies = ncookies;
998
999 return 0;
1000
1001err_out:
1002 vnet_port_free_tx_bufs(port);
1003
1004 return err;
1005}
1006
9184a046
DM		 1007static LIST_HEAD(vnet_list);
1008static DEFINE_MUTEX(vnet_list_mutex);
1009
8fd17f2e
DM		 1010static const struct net_device_ops vnet_ops = {
1011 .ndo_open = vnet_open,
1012 .ndo_stop = vnet_close,
afc4b13d 1013 .ndo_set_rx_mode = vnet_set_rx_mode,
8fd17f2e 1014 .ndo_set_mac_address = vnet_set_mac_addr,
240c102d 1015 .ndo_validate_addr = eth_validate_addr,
8fd17f2e
DM		 1016 .ndo_tx_timeout = vnet_tx_timeout,
1017 .ndo_change_mtu = vnet_change_mtu,
1018 .ndo_start_xmit = vnet_start_xmit,
1019};
1020
f73d12bd 1021static struct vnet *vnet_new(const u64 *local_mac)
9184a046
DM		 1022{
1023 struct net_device *dev;
1024 struct vnet *vp;
1025 int err, i;
1026
1027 dev = alloc_etherdev(sizeof(*vp));
41de8d4c 1028 if (!dev)
9184a046 1029 return ERR_PTR(-ENOMEM);
9184a046
DM		 1030
1031 for (i = 0; i < ETH_ALEN; i++)
1032 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1033
9184a046
DM		 1034 vp = netdev_priv(dev);
1035
1036 spin_lock_init(&vp->lock);
1037 vp->dev = dev;
1038
1039 INIT_LIST_HEAD(&vp->port_list);
1040 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1041 INIT_HLIST_HEAD(&vp->port_hash[i]);
1042 INIT_LIST_HEAD(&vp->list);
1043 vp->local_mac = *local_mac;
1044
8fd17f2e 1045 dev->netdev_ops = &vnet_ops;
9184a046
DM		 1046 dev->ethtool_ops = &vnet_ethtool_ops;
1047 dev->watchdog_timeo = VNET_TX_TIMEOUT;
9184a046
DM		 1048
1049 err = register_netdev(dev);
1050 if (err) {
4d5870ec 1051 pr_err("Cannot register net device, aborting\n");
9184a046
DM		 1052 goto err_out_free_dev;
1053 }
1054
4d5870ec 1055 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
9184a046
DM		 1056
1057 list_add(&vp->list, &vnet_list);
1058
1059 return vp;
1060
1061err_out_free_dev:
1062 free_netdev(dev);
1063
1064 return ERR_PTR(err);
1065}
1066
f73d12bd 1067static struct vnet *vnet_find_or_create(const u64 *local_mac)
9184a046
DM		 1068{
1069 struct vnet *iter, *vp;
1070
1071 mutex_lock(&vnet_list_mutex);
1072 vp = NULL;
1073 list_for_each_entry(iter, &vnet_list, list) {
1074 if (iter->local_mac == *local_mac) {
1075 vp = iter;
1076 break;
1077 }
1078 }
1079 if (!vp)
1080 vp = vnet_new(local_mac);
1081 mutex_unlock(&vnet_list_mutex);
1082
1083 return vp;
1084}
1085
a4b70a07
SV		 1086static void vnet_cleanup(void)
1087{
1088 struct vnet *vp;
1089 struct net_device *dev;
1090
1091 mutex_lock(&vnet_list_mutex);
1092 while (!list_empty(&vnet_list)) {
1093 vp = list_first_entry(&vnet_list, struct vnet, list);
1094 list_del(&vp->list);
1095 dev = vp->dev;
1096 /* vio_unregister_driver() should have cleaned up port_list */
1097 BUG_ON(!list_empty(&vp->port_list));
1098 unregister_netdev(dev);
1099 free_netdev(dev);
1100 }
1101 mutex_unlock(&vnet_list_mutex);
1102}
1103
9184a046
DM		 1104static const char *local_mac_prop = "local-mac-address";
1105
f73d12bd 1106static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
9184a046
DM		 1107 u64 port_node)
1108{
1109 const u64 *local_mac = NULL;
1110 u64 a;
1111
1112 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1113 u64 target = mdesc_arc_target(hp, a);
1114 const char *name;
1115
1116 name = mdesc_get_property(hp, target, "name", NULL);
1117 if (!name || strcmp(name, "network"))
1118 continue;
1119
1120 local_mac = mdesc_get_property(hp, target,
1121 local_mac_prop, NULL);
1122 if (local_mac)
1123 break;
1124 }
1125 if (!local_mac)
1126 return ERR_PTR(-ENODEV);
1127
1128 return vnet_find_or_create(local_mac);
1129}
1130
4c521e42
DM		 1131static struct ldc_channel_config vnet_ldc_cfg = {
1132 .event = vnet_event,
1133 .mtu = 64,
1134 .mode = LDC_MODE_UNRELIABLE,
1135};
1136
1137static struct vio_driver_ops vnet_vio_ops = {
1138 .send_attr = vnet_send_attr,
1139 .handle_attr = vnet_handle_attr,
1140 .handshake_complete = vnet_handshake_complete,
1141};
1142
f73d12bd 1143static void print_version(void)
9184a046 1144{
4d5870ec 1145 printk_once(KERN_INFO "%s", version);
9184a046
DM		 1146}
1147
4c521e42
DM		 1148const char *remote_macaddr_prop = "remote-mac-address";
1149
1dd06ae8 1150static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4c521e42 1151{
43fdf274 1152 struct mdesc_handle *hp;
4c521e42
DM		 1153 struct vnet_port *port;
1154 unsigned long flags;
1155 struct vnet *vp;
1156 const u64 *rmac;
1157 int len, i, err, switch_port;
1158
9184a046 1159 print_version();
4c521e42 1160
43fdf274
DM		 1161 hp = mdesc_grab();
1162
9184a046
DM		 1163 vp = vnet_find_parent(hp, vdev->mp);
1164 if (IS_ERR(vp)) {
4d5870ec 1165 pr_err("Cannot find port parent vnet\n");
9184a046
DM		 1166 err = PTR_ERR(vp);
1167 goto err_out_put_mdesc;
1168 }
1169
43fdf274
DM		 1170 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1171 err = -ENODEV;
4c521e42 1172 if (!rmac) {
4d5870ec 1173 pr_err("Port lacks %s property\n", remote_macaddr_prop);
43fdf274 1174 goto err_out_put_mdesc;
4c521e42
DM		 1175 }
1176
1177 port = kzalloc(sizeof(*port), GFP_KERNEL);
43fdf274 1178 err = -ENOMEM;
e404decb 1179 if (!port)
43fdf274 1180 goto err_out_put_mdesc;
4c521e42
DM		 1181
1182 for (i = 0; i < ETH_ALEN; i++)
1183 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1184
1185 port->vp = vp;
1186
43fdf274 1187 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
4c521e42
DM		 1188 vnet_versions, ARRAY_SIZE(vnet_versions),
1189 &vnet_vio_ops, vp->dev->name);
1190 if (err)
1191 goto err_out_free_port;
1192
1193 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1194 if (err)
1195 goto err_out_free_port;
1196
1197 err = vnet_port_alloc_tx_bufs(port);
1198 if (err)
1199 goto err_out_free_ldc;
1200
1201 INIT_HLIST_NODE(&port->hash);
1202 INIT_LIST_HEAD(&port->list);
1203
1204 switch_port = 0;
43fdf274 1205 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
4c521e42 1206 switch_port = 1;
028ebff2 1207 port->switch_port = switch_port;
4c521e42
DM		 1208
1209 spin_lock_irqsave(&vp->lock, flags);
1210 if (switch_port)
1211 list_add(&port->list, &vp->port_list);
1212 else
1213 list_add_tail(&port->list, &vp->port_list);
1214 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1215 spin_unlock_irqrestore(&vp->lock, flags);
1216
1217 dev_set_drvdata(&vdev->dev, port);
1218
4d5870ec
JP		 1219 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1220 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
4c521e42
DM		 1221
1222 vio_port_up(&port->vio);
1223
43fdf274
DM		 1224 mdesc_release(hp);
1225
4c521e42
DM		 1226 return 0;
1227
1228err_out_free_ldc:
1229 vio_ldc_free(&port->vio);
1230
1231err_out_free_port:
1232 kfree(port);
1233
43fdf274
DM		 1234err_out_put_mdesc:
1235 mdesc_release(hp);
4c521e42
DM		 1236 return err;
1237}
1238
1239static int vnet_port_remove(struct vio_dev *vdev)
1240{
1241 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1242
1243 if (port) {
1244 struct vnet *vp = port->vp;
1245 unsigned long flags;
1246
1247 del_timer_sync(&port->vio.timer);
1248
1249 spin_lock_irqsave(&vp->lock, flags);
1250 list_del(&port->list);
1251 hlist_del(&port->hash);
1252 spin_unlock_irqrestore(&vp->lock, flags);
1253
1254 vnet_port_free_tx_bufs(port);
1255 vio_ldc_free(&port->vio);
1256
1257 dev_set_drvdata(&vdev->dev, NULL);
1258
1259 kfree(port);
aabb9875 1260
4c521e42
DM		 1261 }
1262 return 0;
1263}
1264
3d452e55 1265static const struct vio_device_id vnet_port_match[] = {
4c521e42
DM		 1266 {
1267 .type = "vnet-port",
1268 },
1269 {},
1270};
da68e081 1271MODULE_DEVICE_TABLE(vio, vnet_port_match);
4c521e42
DM		 1272
1273static struct vio_driver vnet_port_driver = {
1274 .id_table = vnet_port_match,
1275 .probe = vnet_port_probe,
1276 .remove = vnet_port_remove,
cb52d897 1277 .name = "vnet_port",
4c521e42
DM		 1278};
1279
4c521e42
DM		 1280static int __init vnet_init(void)
1281{
9184a046 1282 return vio_register_driver(&vnet_port_driver);
4c521e42
DM		 1283}
1284
1285static void __exit vnet_exit(void)
1286{
1287 vio_unregister_driver(&vnet_port_driver);
a4b70a07 1288 vnet_cleanup();
4c521e42
DM		 1289}
1290
1291module_init(vnet_init);
1292module_exit(vnet_exit);
Linux kernel - Deliverables
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