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lec: Fix bug introduced by b67bfe0d42cac56c512dd5da4b1b347a23f4b70a
[mirror_ubuntu-zesty-kernel.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
8266f5fc
DS		 613static inline bool port_is_up(struct vnet_port *vnet)
614{
615 struct vio_driver_state *vio = &vnet->vio;
616
617 return !!(vio->hs_state & VIO_HS_COMPLETE);
618}
619
4c521e42
DM		 620struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
621{
622 unsigned int hash = vnet_hashfn(skb->data);
623 struct hlist_head *hp = &vp->port_hash[hash];
4c521e42
DM		 624 struct vnet_port *port;
625
b67bfe0d 626 hlist_for_each_entry(port, hp, hash) {
8266f5fc
DS		 627 if (!port_is_up(port))
628 continue;
2e42e474 629 if (ether_addr_equal(port->raddr, skb->data))
4c521e42
DM		 630 return port;
631 }
8266f5fc
DS		 632 list_for_each_entry(port, &vp->port_list, list) {
633 if (!port->switch_port)
634 continue;
635 if (!port_is_up(port))
636 continue;
637 return port;
638 }
639 return NULL;
4c521e42
DM		 640}
641
642struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
643{
644 struct vnet_port *ret;
645 unsigned long flags;
646
647 spin_lock_irqsave(&vp->lock, flags);
648 ret = __tx_port_find(vp, skb);
649 spin_unlock_irqrestore(&vp->lock, flags);
650
651 return ret;
652}
653
654static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
655{
656 struct vnet *vp = netdev_priv(dev);
657 struct vnet_port *port = tx_port_find(vp, skb);
658 struct vio_dring_state *dr;
659 struct vio_net_desc *d;
660 unsigned long flags;
661 unsigned int len;
662 void *tx_buf;
663 int i, err;
664
665 if (unlikely(!port))
666 goto out_dropped;
667
668 spin_lock_irqsave(&port->vio.lock, flags);
669
670 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
671 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
672 if (!netif_queue_stopped(dev)) {
673 netif_stop_queue(dev);
674
675 /* This is a hard error, log it. */
4d5870ec 676 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
4c521e42
DM		 677 dev->stats.tx_errors++;
678 }
679 spin_unlock_irqrestore(&port->vio.lock, flags);
680 return NETDEV_TX_BUSY;
681 }
682
683 d = vio_dring_cur(dr);
684
685 tx_buf = port->tx_bufs[dr->prod].buf;
686 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
687
688 len = skb->len;
689 if (len < ETH_ZLEN) {
690 len = ETH_ZLEN;
691 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
692 }
693
694 d->hdr.ack = VIO_ACK_ENABLE;
695 d->size = len;
696 d->ncookies = port->tx_bufs[dr->prod].ncookies;
697 for (i = 0; i < d->ncookies; i++)
698 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
699
700 /* This has to be a non-SMP write barrier because we are writing
701 * to memory which is shared with the peer LDOM.
702 */
703 wmb();
704
705 d->hdr.state = VIO_DESC_READY;
706
707 err = __vnet_tx_trigger(port);
708 if (unlikely(err < 0)) {
4d5870ec 709 netdev_info(dev, "TX trigger error %d\n", err);
4c521e42
DM		 710 d->hdr.state = VIO_DESC_FREE;
711 dev->stats.tx_carrier_errors++;
712 goto out_dropped_unlock;
713 }
714
715 dev->stats.tx_packets++;
716 dev->stats.tx_bytes += skb->len;
717
718 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
719 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
720 netif_stop_queue(dev);
721 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
722 netif_wake_queue(dev);
723 }
724
725 spin_unlock_irqrestore(&port->vio.lock, flags);
726
727 dev_kfree_skb(skb);
728
4c521e42
DM		 729 return NETDEV_TX_OK;
730
731out_dropped_unlock:
732 spin_unlock_irqrestore(&port->vio.lock, flags);
733
734out_dropped:
735 dev_kfree_skb(skb);
736 dev->stats.tx_dropped++;
737 return NETDEV_TX_OK;
738}
739
740static void vnet_tx_timeout(struct net_device *dev)
741{
742 /* XXX Implement me XXX */
743}
744
745static int vnet_open(struct net_device *dev)
746{
747 netif_carrier_on(dev);
748 netif_start_queue(dev);
749
750 return 0;
751}
752
753static int vnet_close(struct net_device *dev)
754{
755 netif_stop_queue(dev);
756 netif_carrier_off(dev);
757
758 return 0;
759}
760
028ebff2
DM		 761static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
762{
763 struct vnet_mcast_entry *m;
764
765 for (m = vp->mcast_list; m; m = m->next) {
00fa4ce9 766 if (ether_addr_equal(m->addr, addr))
028ebff2
DM		 767 return m;
768 }
769 return NULL;
770}
771
772static void __update_mc_list(struct vnet *vp, struct net_device *dev)
773{
22bedad3 774 struct netdev_hw_addr *ha;
028ebff2 775
22bedad3 776 netdev_for_each_mc_addr(ha, dev) {
028ebff2
DM		 777 struct vnet_mcast_entry *m;
778
22bedad3 779 m = __vnet_mc_find(vp, ha->addr);
028ebff2
DM		 780 if (m) {
781 m->hit = 1;
782 continue;
783 }
784
785 if (!m) {
786 m = kzalloc(sizeof(*m), GFP_ATOMIC);
787 if (!m)
788 continue;
22bedad3 789 memcpy(m->addr, ha->addr, ETH_ALEN);
028ebff2
DM		 790 m->hit = 1;
791
792 m->next = vp->mcast_list;
793 vp->mcast_list = m;
794 }
795 }
796}
797
798static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
799{
800 struct vio_net_mcast_info info;
801 struct vnet_mcast_entry *m, **pp;
802 int n_addrs;
803
804 memset(&info, 0, sizeof(info));
805
806 info.tag.type = VIO_TYPE_CTRL;
807 info.tag.stype = VIO_SUBTYPE_INFO;
808 info.tag.stype_env = VNET_MCAST_INFO;
809 info.tag.sid = vio_send_sid(&port->vio);
810 info.set = 1;
811
812 n_addrs = 0;
813 for (m = vp->mcast_list; m; m = m->next) {
814 if (m->sent)
815 continue;
816 m->sent = 1;
817 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
818 m->addr, ETH_ALEN);
819 if (++n_addrs == VNET_NUM_MCAST) {
820 info.count = n_addrs;
821
822 (void) vio_ldc_send(&port->vio, &info,
823 sizeof(info));
824 n_addrs = 0;
825 }
826 }
827 if (n_addrs) {
828 info.count = n_addrs;
829 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
830 }
831
832 info.set = 0;
833
834 n_addrs = 0;
835 pp = &vp->mcast_list;
836 while ((m = *pp) != NULL) {
837 if (m->hit) {
838 m->hit = 0;
839 pp = &m->next;
840 continue;
841 }
842
843 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
844 m->addr, ETH_ALEN);
845 if (++n_addrs == VNET_NUM_MCAST) {
846 info.count = n_addrs;
847 (void) vio_ldc_send(&port->vio, &info,
848 sizeof(info));
849 n_addrs = 0;
850 }
851
852 *pp = m->next;
853 kfree(m);
854 }
855 if (n_addrs) {
856 info.count = n_addrs;
857 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
858 }
859}
860
4c521e42
DM		 861static void vnet_set_rx_mode(struct net_device *dev)
862{
028ebff2
DM		 863 struct vnet *vp = netdev_priv(dev);
864 struct vnet_port *port;
865 unsigned long flags;
866
867 spin_lock_irqsave(&vp->lock, flags);
868 if (!list_empty(&vp->port_list)) {
869 port = list_entry(vp->port_list.next, struct vnet_port, list);
870
871 if (port->switch_port) {
872 __update_mc_list(vp, dev);
873 __send_mc_list(vp, port);
874 }
875 }
876 spin_unlock_irqrestore(&vp->lock, flags);
4c521e42
DM		 877}
878
879static int vnet_change_mtu(struct net_device *dev, int new_mtu)
880{
881 if (new_mtu != ETH_DATA_LEN)
882 return -EINVAL;
883
884 dev->mtu = new_mtu;
885 return 0;
886}
887
888static int vnet_set_mac_addr(struct net_device *dev, void *p)
889{
890 return -EINVAL;
891}
892
893static void vnet_get_drvinfo(struct net_device *dev,
894 struct ethtool_drvinfo *info)
895{
7826d43f
JP		 896 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
897 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
4c521e42
DM		 898}
899
900static u32 vnet_get_msglevel(struct net_device *dev)
901{
902 struct vnet *vp = netdev_priv(dev);
903 return vp->msg_enable;
904}
905
906static void vnet_set_msglevel(struct net_device *dev, u32 value)
907{
908 struct vnet *vp = netdev_priv(dev);
909 vp->msg_enable = value;
910}
911
912static const struct ethtool_ops vnet_ethtool_ops = {
913 .get_drvinfo = vnet_get_drvinfo,
914 .get_msglevel = vnet_get_msglevel,
915 .set_msglevel = vnet_set_msglevel,
916 .get_link = ethtool_op_get_link,
4c521e42
DM		 917};
918
919static void vnet_port_free_tx_bufs(struct vnet_port *port)
920{
921 struct vio_dring_state *dr;
922 int i;
923
924 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
925 if (dr->base) {
926 ldc_free_exp_dring(port->vio.lp, dr->base,
927 (dr->entry_size * dr->num_entries),
928 dr->cookies, dr->ncookies);
929 dr->base = NULL;
930 dr->entry_size = 0;
931 dr->num_entries = 0;
932 dr->pending = 0;
933 dr->ncookies = 0;
934 }
935
936 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
937 void *buf = port->tx_bufs[i].buf;
938
939 if (!buf)
940 continue;
941
942 ldc_unmap(port->vio.lp,
943 port->tx_bufs[i].cookies,
944 port->tx_bufs[i].ncookies);
945
946 kfree(buf);
947 port->tx_bufs[i].buf = NULL;
948 }
949}
950
f73d12bd 951static int vnet_port_alloc_tx_bufs(struct vnet_port *port)
4c521e42
DM		 952{
953 struct vio_dring_state *dr;
954 unsigned long len;
955 int i, err, ncookies;
956 void *dring;
957
958 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
959 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
960 int map_len = (ETH_FRAME_LEN + 7) & ~7;
961
962 err = -ENOMEM;
e404decb 963 if (!buf)
4c521e42 964 goto err_out;
e404decb 965
4c521e42
DM		 966 err = -EFAULT;
967 if ((unsigned long)buf & (8UL - 1)) {
4d5870ec 968 pr_err("TX buffer misaligned\n");
4c521e42
DM		 969 kfree(buf);
970 goto err_out;
971 }
972
973 err = ldc_map_single(port->vio.lp, buf, map_len,
974 port->tx_bufs[i].cookies, 2,
975 (LDC_MAP_SHADOW |
976 LDC_MAP_DIRECT |
977 LDC_MAP_RW));
978 if (err < 0) {
979 kfree(buf);
980 goto err_out;
981 }
982 port->tx_bufs[i].buf = buf;
983 port->tx_bufs[i].ncookies = err;
984 }
985
986 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
987
988 len = (VNET_TX_RING_SIZE *
989 (sizeof(struct vio_net_desc) +
990 (sizeof(struct ldc_trans_cookie) * 2)));
991
992 ncookies = VIO_MAX_RING_COOKIES;
993 dring = ldc_alloc_exp_dring(port->vio.lp, len,
994 dr->cookies, &ncookies,
995 (LDC_MAP_SHADOW |
996 LDC_MAP_DIRECT |
997 LDC_MAP_RW));
998 if (IS_ERR(dring)) {
999 err = PTR_ERR(dring);
1000 goto err_out;
1001 }
1002
1003 dr->base = dring;
1004 dr->entry_size = (sizeof(struct vio_net_desc) +
1005 (sizeof(struct ldc_trans_cookie) * 2));
1006 dr->num_entries = VNET_TX_RING_SIZE;
1007 dr->prod = dr->cons = 0;
1008 dr->pending = VNET_TX_RING_SIZE;
1009 dr->ncookies = ncookies;
1010
1011 return 0;
1012
1013err_out:
1014 vnet_port_free_tx_bufs(port);
1015
1016 return err;
1017}
1018
9184a046
DM		 1019static LIST_HEAD(vnet_list);
1020static DEFINE_MUTEX(vnet_list_mutex);
1021
8fd17f2e
DM		 1022static const struct net_device_ops vnet_ops = {
1023 .ndo_open = vnet_open,
1024 .ndo_stop = vnet_close,
afc4b13d 1025 .ndo_set_rx_mode = vnet_set_rx_mode,
8fd17f2e 1026 .ndo_set_mac_address = vnet_set_mac_addr,
240c102d 1027 .ndo_validate_addr = eth_validate_addr,
8fd17f2e
DM		 1028 .ndo_tx_timeout = vnet_tx_timeout,
1029 .ndo_change_mtu = vnet_change_mtu,
1030 .ndo_start_xmit = vnet_start_xmit,
1031};
1032
f73d12bd 1033static struct vnet *vnet_new(const u64 *local_mac)
9184a046
DM		 1034{
1035 struct net_device *dev;
1036 struct vnet *vp;
1037 int err, i;
1038
1039 dev = alloc_etherdev(sizeof(*vp));
41de8d4c 1040 if (!dev)
9184a046 1041 return ERR_PTR(-ENOMEM);
9184a046
DM		 1042
1043 for (i = 0; i < ETH_ALEN; i++)
1044 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1045
9184a046
DM		 1046 vp = netdev_priv(dev);
1047
1048 spin_lock_init(&vp->lock);
1049 vp->dev = dev;
1050
1051 INIT_LIST_HEAD(&vp->port_list);
1052 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1053 INIT_HLIST_HEAD(&vp->port_hash[i]);
1054 INIT_LIST_HEAD(&vp->list);
1055 vp->local_mac = *local_mac;
1056
8fd17f2e 1057 dev->netdev_ops = &vnet_ops;
9184a046
DM		 1058 dev->ethtool_ops = &vnet_ethtool_ops;
1059 dev->watchdog_timeo = VNET_TX_TIMEOUT;
9184a046
DM		 1060
1061 err = register_netdev(dev);
1062 if (err) {
4d5870ec 1063 pr_err("Cannot register net device, aborting\n");
9184a046
DM		 1064 goto err_out_free_dev;
1065 }
1066
4d5870ec 1067 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
9184a046
DM		 1068
1069 list_add(&vp->list, &vnet_list);
1070
1071 return vp;
1072
1073err_out_free_dev:
1074 free_netdev(dev);
1075
1076 return ERR_PTR(err);
1077}
1078
f73d12bd 1079static struct vnet *vnet_find_or_create(const u64 *local_mac)
9184a046
DM		 1080{
1081 struct vnet *iter, *vp;
1082
1083 mutex_lock(&vnet_list_mutex);
1084 vp = NULL;
1085 list_for_each_entry(iter, &vnet_list, list) {
1086 if (iter->local_mac == *local_mac) {
1087 vp = iter;
1088 break;
1089 }
1090 }
1091 if (!vp)
1092 vp = vnet_new(local_mac);
1093 mutex_unlock(&vnet_list_mutex);
1094
1095 return vp;
1096}
1097
a4b70a07
SV		 1098static void vnet_cleanup(void)
1099{
1100 struct vnet *vp;
1101 struct net_device *dev;
1102
1103 mutex_lock(&vnet_list_mutex);
1104 while (!list_empty(&vnet_list)) {
1105 vp = list_first_entry(&vnet_list, struct vnet, list);
1106 list_del(&vp->list);
1107 dev = vp->dev;
1108 /* vio_unregister_driver() should have cleaned up port_list */
1109 BUG_ON(!list_empty(&vp->port_list));
1110 unregister_netdev(dev);
1111 free_netdev(dev);
1112 }
1113 mutex_unlock(&vnet_list_mutex);
1114}
1115
9184a046
DM		 1116static const char *local_mac_prop = "local-mac-address";
1117
f73d12bd 1118static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
9184a046
DM		 1119 u64 port_node)
1120{
1121 const u64 *local_mac = NULL;
1122 u64 a;
1123
1124 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1125 u64 target = mdesc_arc_target(hp, a);
1126 const char *name;
1127
1128 name = mdesc_get_property(hp, target, "name", NULL);
1129 if (!name || strcmp(name, "network"))
1130 continue;
1131
1132 local_mac = mdesc_get_property(hp, target,
1133 local_mac_prop, NULL);
1134 if (local_mac)
1135 break;
1136 }
1137 if (!local_mac)
1138 return ERR_PTR(-ENODEV);
1139
1140 return vnet_find_or_create(local_mac);
1141}
1142
4c521e42
DM		 1143static struct ldc_channel_config vnet_ldc_cfg = {
1144 .event = vnet_event,
1145 .mtu = 64,
1146 .mode = LDC_MODE_UNRELIABLE,
1147};
1148
1149static struct vio_driver_ops vnet_vio_ops = {
1150 .send_attr = vnet_send_attr,
1151 .handle_attr = vnet_handle_attr,
1152 .handshake_complete = vnet_handshake_complete,
1153};
1154
f73d12bd 1155static void print_version(void)
9184a046 1156{
4d5870ec 1157 printk_once(KERN_INFO "%s", version);
9184a046
DM		 1158}
1159
4c521e42
DM		 1160const char *remote_macaddr_prop = "remote-mac-address";
1161
1dd06ae8 1162static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4c521e42 1163{
43fdf274 1164 struct mdesc_handle *hp;
4c521e42
DM		 1165 struct vnet_port *port;
1166 unsigned long flags;
1167 struct vnet *vp;
1168 const u64 *rmac;
1169 int len, i, err, switch_port;
1170
9184a046 1171 print_version();
4c521e42 1172
43fdf274
DM		 1173 hp = mdesc_grab();
1174
9184a046
DM		 1175 vp = vnet_find_parent(hp, vdev->mp);
1176 if (IS_ERR(vp)) {
4d5870ec 1177 pr_err("Cannot find port parent vnet\n");
9184a046
DM		 1178 err = PTR_ERR(vp);
1179 goto err_out_put_mdesc;
1180 }
1181
43fdf274
DM		 1182 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1183 err = -ENODEV;
4c521e42 1184 if (!rmac) {
4d5870ec 1185 pr_err("Port lacks %s property\n", remote_macaddr_prop);
43fdf274 1186 goto err_out_put_mdesc;
4c521e42
DM		 1187 }
1188
1189 port = kzalloc(sizeof(*port), GFP_KERNEL);
43fdf274 1190 err = -ENOMEM;
e404decb 1191 if (!port)
43fdf274 1192 goto err_out_put_mdesc;
4c521e42
DM		 1193
1194 for (i = 0; i < ETH_ALEN; i++)
1195 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1196
1197 port->vp = vp;
1198
43fdf274 1199 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
4c521e42
DM		 1200 vnet_versions, ARRAY_SIZE(vnet_versions),
1201 &vnet_vio_ops, vp->dev->name);
1202 if (err)
1203 goto err_out_free_port;
1204
1205 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1206 if (err)
1207 goto err_out_free_port;
1208
1209 err = vnet_port_alloc_tx_bufs(port);
1210 if (err)
1211 goto err_out_free_ldc;
1212
1213 INIT_HLIST_NODE(&port->hash);
1214 INIT_LIST_HEAD(&port->list);
1215
1216 switch_port = 0;
43fdf274 1217 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
4c521e42 1218 switch_port = 1;
028ebff2 1219 port->switch_port = switch_port;
4c521e42
DM		 1220
1221 spin_lock_irqsave(&vp->lock, flags);
1222 if (switch_port)
1223 list_add(&port->list, &vp->port_list);
1224 else
1225 list_add_tail(&port->list, &vp->port_list);
1226 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1227 spin_unlock_irqrestore(&vp->lock, flags);
1228
1229 dev_set_drvdata(&vdev->dev, port);
1230
4d5870ec
JP		 1231 pr_info("%s: PORT ( remote-mac %pM%s )\n",
1232 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
4c521e42
DM		 1233
1234 vio_port_up(&port->vio);
1235
43fdf274
DM		 1236 mdesc_release(hp);
1237
4c521e42
DM		 1238 return 0;
1239
1240err_out_free_ldc:
1241 vio_ldc_free(&port->vio);
1242
1243err_out_free_port:
1244 kfree(port);
1245
43fdf274
DM		 1246err_out_put_mdesc:
1247 mdesc_release(hp);
4c521e42
DM		 1248 return err;
1249}
1250
1251static int vnet_port_remove(struct vio_dev *vdev)
1252{
1253 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1254
1255 if (port) {
1256 struct vnet *vp = port->vp;
1257 unsigned long flags;
1258
1259 del_timer_sync(&port->vio.timer);
1260
1261 spin_lock_irqsave(&vp->lock, flags);
1262 list_del(&port->list);
1263 hlist_del(&port->hash);
1264 spin_unlock_irqrestore(&vp->lock, flags);
1265
1266 vnet_port_free_tx_bufs(port);
1267 vio_ldc_free(&port->vio);
1268
1269 dev_set_drvdata(&vdev->dev, NULL);
1270
1271 kfree(port);
aabb9875 1272
4c521e42
DM		 1273 }
1274 return 0;
1275}
1276
3d452e55 1277static const struct vio_device_id vnet_port_match[] = {
4c521e42
DM		 1278 {
1279 .type = "vnet-port",
1280 },
1281 {},
1282};
da68e081 1283MODULE_DEVICE_TABLE(vio, vnet_port_match);
4c521e42
DM		 1284
1285static struct vio_driver vnet_port_driver = {
1286 .id_table = vnet_port_match,
1287 .probe = vnet_port_probe,
1288 .remove = vnet_port_remove,
cb52d897 1289 .name = "vnet_port",
4c521e42
DM		 1290};
1291
4c521e42
DM		 1292static int __init vnet_init(void)
1293{
9184a046 1294 return vio_register_driver(&vnet_port_driver);
4c521e42
DM		 1295}
1296
1297static void __exit vnet_exit(void)
1298{
1299 vio_unregister_driver(&vnet_port_driver);
a4b70a07 1300 vnet_cleanup();
4c521e42
DM		 1301}
1302
1303module_init(vnet_init);
1304module_exit(vnet_exit);
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