1 /* sunvnet.c: Sun LDOM Virtual Network Driver.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4 */
5
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/slab.h>
10 #include <linux/delay.h>
11 #include <linux/init.h>
12 #include <linux/netdevice.h>
13 #include <linux/ethtool.h>
14 #include <linux/etherdevice.h>
15 #include <linux/mutex.h>
16
17 #include <asm/vio.h>
18 #include <asm/ldc.h>
19
20 #include "sunvnet.h"
21
22 #define DRV_MODULE_NAME "sunvnet"
23 #define PFX DRV_MODULE_NAME ": "
24 #define DRV_MODULE_VERSION "1.0"
25 #define DRV_MODULE_RELDATE "June 25, 2007"
26
27 static char version[] __devinitdata =
28 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
29 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
30 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
31 MODULE_LICENSE("GPL");
32 MODULE_VERSION(DRV_MODULE_VERSION);
33
34 /* Ordered from largest major to lowest */
35 static struct vio_version vnet_versions[] = {
36 { .major = 1, .minor = 0 },
37 };
38
vnet_tx_dring_avail(struct vio_dring_state * dr)39 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
40 {
41 return vio_dring_avail(dr, VNET_TX_RING_SIZE);
42 }
43
vnet_handle_unknown(struct vnet_port * port,void * arg)44 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
45 {
46 struct vio_msg_tag *pkt = arg;
47
48 printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
49 pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
50 printk(KERN_ERR PFX "Resetting connection.\n");
51
52 ldc_disconnect(port->vio.lp);
53
54 return -ECONNRESET;
55 }
56
vnet_send_attr(struct vio_driver_state * vio)57 static int vnet_send_attr(struct vio_driver_state *vio)
58 {
59 struct vnet_port *port = to_vnet_port(vio);
60 struct net_device *dev = port->vp->dev;
61 struct vio_net_attr_info pkt;
62 int i;
63
64 memset(&pkt, 0, sizeof(pkt));
65 pkt.tag.type = VIO_TYPE_CTRL;
66 pkt.tag.stype = VIO_SUBTYPE_INFO;
67 pkt.tag.stype_env = VIO_ATTR_INFO;
68 pkt.tag.sid = vio_send_sid(vio);
69 pkt.xfer_mode = VIO_DRING_MODE;
70 pkt.addr_type = VNET_ADDR_ETHERMAC;
71 pkt.ack_freq = 0;
72 for (i = 0; i < 6; i++)
73 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
74 pkt.mtu = ETH_FRAME_LEN;
75
76 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
77 "ackfreq[%u] mtu[%llu]\n",
78 pkt.xfer_mode, pkt.addr_type,
79 (unsigned long long) pkt.addr,
80 pkt.ack_freq,
81 (unsigned long long) pkt.mtu);
82
83 return vio_ldc_send(vio, &pkt, sizeof(pkt));
84 }
85
handle_attr_info(struct vio_driver_state * vio,struct vio_net_attr_info * pkt)86 static int handle_attr_info(struct vio_driver_state *vio,
87 struct vio_net_attr_info *pkt)
88 {
89 viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
90 "ackfreq[%u] mtu[%llu]\n",
91 pkt->xfer_mode, pkt->addr_type,
92 (unsigned long long) pkt->addr,
93 pkt->ack_freq,
94 (unsigned long long) pkt->mtu);
95
96 pkt->tag.sid = vio_send_sid(vio);
97
98 if (pkt->xfer_mode != VIO_DRING_MODE ||
99 pkt->addr_type != VNET_ADDR_ETHERMAC ||
100 pkt->mtu != ETH_FRAME_LEN) {
101 viodbg(HS, "SEND NET ATTR NACK\n");
102
103 pkt->tag.stype = VIO_SUBTYPE_NACK;
104
105 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
106
107 return -ECONNRESET;
108 } else {
109 viodbg(HS, "SEND NET ATTR ACK\n");
110
111 pkt->tag.stype = VIO_SUBTYPE_ACK;
112
113 return vio_ldc_send(vio, pkt, sizeof(*pkt));
114 }
115
116 }
117
handle_attr_ack(struct vio_driver_state * vio,struct vio_net_attr_info * pkt)118 static int handle_attr_ack(struct vio_driver_state *vio,
119 struct vio_net_attr_info *pkt)
120 {
121 viodbg(HS, "GOT NET ATTR ACK\n");
122
123 return 0;
124 }
125
handle_attr_nack(struct vio_driver_state * vio,struct vio_net_attr_info * pkt)126 static int handle_attr_nack(struct vio_driver_state *vio,
127 struct vio_net_attr_info *pkt)
128 {
129 viodbg(HS, "GOT NET ATTR NACK\n");
130
131 return -ECONNRESET;
132 }
133
vnet_handle_attr(struct vio_driver_state * vio,void * arg)134 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
135 {
136 struct vio_net_attr_info *pkt = arg;
137
138 switch (pkt->tag.stype) {
139 case VIO_SUBTYPE_INFO:
140 return handle_attr_info(vio, pkt);
141
142 case VIO_SUBTYPE_ACK:
143 return handle_attr_ack(vio, pkt);
144
145 case VIO_SUBTYPE_NACK:
146 return handle_attr_nack(vio, pkt);
147
148 default:
149 return -ECONNRESET;
150 }
151 }
152
vnet_handshake_complete(struct vio_driver_state * vio)153 static void vnet_handshake_complete(struct vio_driver_state *vio)
154 {
155 struct vio_dring_state *dr;
156
157 dr = &vio->drings[VIO_DRIVER_RX_RING];
158 dr->snd_nxt = dr->rcv_nxt = 1;
159
160 dr = &vio->drings[VIO_DRIVER_TX_RING];
161 dr->snd_nxt = dr->rcv_nxt = 1;
162 }
163
164 /* The hypervisor interface that implements copying to/from imported
165 * memory from another domain requires that copies are done to 8-byte
166 * aligned buffers, and that the lengths of such copies are also 8-byte
167 * multiples.
168 *
169 * So we align skb->data to an 8-byte multiple and pad-out the data
170 * area so we can round the copy length up to the next multiple of
171 * 8 for the copy.
172 *
173 * The transmitter puts the actual start of the packet 6 bytes into
174 * the buffer it sends over, so that the IP headers after the ethernet
175 * header are aligned properly. These 6 bytes are not in the descriptor
176 * length, they are simply implied. This offset is represented using
177 * the VNET_PACKET_SKIP macro.
178 */
alloc_and_align_skb(struct net_device * dev,unsigned int len)179 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
180 unsigned int len)
181 {
182 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
183 unsigned long addr, off;
184
185 if (unlikely(!skb))
186 return NULL;
187
188 addr = (unsigned long) skb->data;
189 off = ((addr + 7UL) & ~7UL) - addr;
190 if (off)
191 skb_reserve(skb, off);
192
193 return skb;
194 }
195
vnet_rx_one(struct vnet_port * port,unsigned int len,struct ldc_trans_cookie * cookies,int ncookies)196 static int vnet_rx_one(struct vnet_port *port, unsigned int len,
197 struct ldc_trans_cookie *cookies, int ncookies)
198 {
199 struct net_device *dev = port->vp->dev;
200 unsigned int copy_len;
201 struct sk_buff *skb;
202 int err;
203
204 err = -EMSGSIZE;
205 if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
206 dev->stats.rx_length_errors++;
207 goto out_dropped;
208 }
209
210 skb = alloc_and_align_skb(dev, len);
211 err = -ENOMEM;
212 if (unlikely(!skb)) {
213 dev->stats.rx_missed_errors++;
214 goto out_dropped;
215 }
216
217 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
218 skb_put(skb, copy_len);
219 err = ldc_copy(port->vio.lp, LDC_COPY_IN,
220 skb->data, copy_len, 0,
221 cookies, ncookies);
222 if (unlikely(err < 0)) {
223 dev->stats.rx_frame_errors++;
224 goto out_free_skb;
225 }
226
227 skb_pull(skb, VNET_PACKET_SKIP);
228 skb_trim(skb, len);
229 skb->protocol = eth_type_trans(skb, dev);
230
231 dev->stats.rx_packets++;
232 dev->stats.rx_bytes += len;
233
234 netif_rx(skb);
235
236 return 0;
237
238 out_free_skb:
239 kfree_skb(skb);
240
241 out_dropped:
242 dev->stats.rx_dropped++;
243 return err;
244 }
245
vnet_send_ack(struct vnet_port * port,struct vio_dring_state * dr,u32 start,u32 end,u8 vio_dring_state)246 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
247 u32 start, u32 end, u8 vio_dring_state)
248 {
249 struct vio_dring_data hdr = {
250 .tag = {
251 .type = VIO_TYPE_DATA,
252 .stype = VIO_SUBTYPE_ACK,
253 .stype_env = VIO_DRING_DATA,
254 .sid = vio_send_sid(&port->vio),
255 },
256 .dring_ident = dr->ident,
257 .start_idx = start,
258 .end_idx = end,
259 .state = vio_dring_state,
260 };
261 int err, delay;
262
263 hdr.seq = dr->snd_nxt;
264 delay = 1;
265 do {
266 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
267 if (err > 0) {
268 dr->snd_nxt++;
269 break;
270 }
271 udelay(delay);
272 if ((delay <<= 1) > 128)
273 delay = 128;
274 } while (err == -EAGAIN);
275
276 return err;
277 }
278
next_idx(u32 idx,struct vio_dring_state * dr)279 static u32 next_idx(u32 idx, struct vio_dring_state *dr)
280 {
281 if (++idx == dr->num_entries)
282 idx = 0;
283 return idx;
284 }
285
prev_idx(u32 idx,struct vio_dring_state * dr)286 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
287 {
288 if (idx == 0)
289 idx = dr->num_entries - 1;
290 else
291 idx--;
292
293 return idx;
294 }
295
get_rx_desc(struct vnet_port * port,struct vio_dring_state * dr,u32 index)296 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
297 struct vio_dring_state *dr,
298 u32 index)
299 {
300 struct vio_net_desc *desc = port->vio.desc_buf;
301 int err;
302
303 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
304 (index * dr->entry_size),
305 dr->cookies, dr->ncookies);
306 if (err < 0)
307 return ERR_PTR(err);
308
309 return desc;
310 }
311
put_rx_desc(struct vnet_port * port,struct vio_dring_state * dr,struct vio_net_desc * desc,u32 index)312 static int put_rx_desc(struct vnet_port *port,
313 struct vio_dring_state *dr,
314 struct vio_net_desc *desc,
315 u32 index)
316 {
317 int err;
318
319 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
320 (index * dr->entry_size),
321 dr->cookies, dr->ncookies);
322 if (err < 0)
323 return err;
324
325 return 0;
326 }
327
vnet_walk_rx_one(struct vnet_port * port,struct vio_dring_state * dr,u32 index,int * needs_ack)328 static int vnet_walk_rx_one(struct vnet_port *port,
329 struct vio_dring_state *dr,
330 u32 index, int *needs_ack)
331 {
332 struct vio_net_desc *desc = get_rx_desc(port, dr, index);
333 struct vio_driver_state *vio = &port->vio;
334 int err;
335
336 if (IS_ERR(desc))
337 return PTR_ERR(desc);
338
339 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
340 desc->hdr.state, desc->hdr.ack,
341 desc->size, desc->ncookies,
342 desc->cookies[0].cookie_addr,
343 desc->cookies[0].cookie_size);
344
345 if (desc->hdr.state != VIO_DESC_READY)
346 return 1;
347 err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
348 if (err == -ECONNRESET)
349 return err;
350 desc->hdr.state = VIO_DESC_DONE;
351 err = put_rx_desc(port, dr, desc, index);
352 if (err < 0)
353 return err;
354 *needs_ack = desc->hdr.ack;
355 return 0;
356 }
357
vnet_walk_rx(struct vnet_port * port,struct vio_dring_state * dr,u32 start,u32 end)358 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
359 u32 start, u32 end)
360 {
361 struct vio_driver_state *vio = &port->vio;
362 int ack_start = -1, ack_end = -1;
363
364 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
365
366 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
367
368 while (start != end) {
369 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
370 if (err == -ECONNRESET)
371 return err;
372 if (err != 0)
373 break;
374 if (ack_start == -1)
375 ack_start = start;
376 ack_end = start;
377 start = next_idx(start, dr);
378 if (ack && start != end) {
379 err = vnet_send_ack(port, dr, ack_start, ack_end,
380 VIO_DRING_ACTIVE);
381 if (err == -ECONNRESET)
382 return err;
383 ack_start = -1;
384 }
385 }
386 if (unlikely(ack_start == -1))
387 ack_start = ack_end = prev_idx(start, dr);
388 return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
389 }
390
vnet_rx(struct vnet_port * port,void * msgbuf)391 static int vnet_rx(struct vnet_port *port, void *msgbuf)
392 {
393 struct vio_dring_data *pkt = msgbuf;
394 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
395 struct vio_driver_state *vio = &port->vio;
396
397 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
398 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
399
400 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
401 return 0;
402 if (unlikely(pkt->seq != dr->rcv_nxt)) {
403 printk(KERN_ERR PFX "RX out of sequence seq[0x%llx] "
404 "rcv_nxt[0x%llx]\n", pkt->seq, dr->rcv_nxt);
405 return 0;
406 }
407
408 dr->rcv_nxt++;
409
410 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
411
412 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
413 }
414
idx_is_pending(struct vio_dring_state * dr,u32 end)415 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
416 {
417 u32 idx = dr->cons;
418 int found = 0;
419
420 while (idx != dr->prod) {
421 if (idx == end) {
422 found = 1;
423 break;
424 }
425 idx = next_idx(idx, dr);
426 }
427 return found;
428 }
429
vnet_ack(struct vnet_port * port,void * msgbuf)430 static int vnet_ack(struct vnet_port *port, void *msgbuf)
431 {
432 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
433 struct vio_dring_data *pkt = msgbuf;
434 struct net_device *dev;
435 struct vnet *vp;
436 u32 end;
437
438 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
439 return 0;
440
441 end = pkt->end_idx;
442 if (unlikely(!idx_is_pending(dr, end)))
443 return 0;
444
445 dr->cons = next_idx(end, dr);
446
447 vp = port->vp;
448 dev = vp->dev;
449 if (unlikely(netif_queue_stopped(dev) &&
450 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
451 return 1;
452
453 return 0;
454 }
455
vnet_nack(struct vnet_port * port,void * msgbuf)456 static int vnet_nack(struct vnet_port *port, void *msgbuf)
457 {
458 /* XXX just reset or similar XXX */
459 return 0;
460 }
461
handle_mcast(struct vnet_port * port,void * msgbuf)462 static int handle_mcast(struct vnet_port *port, void *msgbuf)
463 {
464 struct vio_net_mcast_info *pkt = msgbuf;
465
466 if (pkt->tag.stype != VIO_SUBTYPE_ACK)
467 printk(KERN_ERR PFX "%s: Got unexpected MCAST reply "
468 "[%02x:%02x:%04x:%08x]\n",
469 port->vp->dev->name,
470 pkt->tag.type,
471 pkt->tag.stype,
472 pkt->tag.stype_env,
473 pkt->tag.sid);
474
475 return 0;
476 }
477
maybe_tx_wakeup(struct vnet * vp)478 static void maybe_tx_wakeup(struct vnet *vp)
479 {
480 struct net_device *dev = vp->dev;
481
482 netif_tx_lock(dev);
483 if (likely(netif_queue_stopped(dev))) {
484 struct vnet_port *port;
485 int wake = 1;
486
487 list_for_each_entry(port, &vp->port_list, list) {
488 struct vio_dring_state *dr;
489
490 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
491 if (vnet_tx_dring_avail(dr) <
492 VNET_TX_WAKEUP_THRESH(dr)) {
493 wake = 0;
494 break;
495 }
496 }
497 if (wake)
498 netif_wake_queue(dev);
499 }
500 netif_tx_unlock(dev);
501 }
502
vnet_event(void * arg,int event)503 static void vnet_event(void *arg, int event)
504 {
505 struct vnet_port *port = arg;
506 struct vio_driver_state *vio = &port->vio;
507 unsigned long flags;
508 int tx_wakeup, err;
509
510 spin_lock_irqsave(&vio->lock, flags);
511
512 if (unlikely(event == LDC_EVENT_RESET ||
513 event == LDC_EVENT_UP)) {
514 vio_link_state_change(vio, event);
515 spin_unlock_irqrestore(&vio->lock, flags);
516
517 if (event == LDC_EVENT_RESET)
518 vio_port_up(vio);
519 return;
520 }
521
522 if (unlikely(event != LDC_EVENT_DATA_READY)) {
523 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
524 spin_unlock_irqrestore(&vio->lock, flags);
525 return;
526 }
527
528 tx_wakeup = err = 0;
529 while (1) {
530 union {
531 struct vio_msg_tag tag;
532 u64 raw[8];
533 } msgbuf;
534
535 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
536 if (unlikely(err < 0)) {
537 if (err == -ECONNRESET)
538 vio_conn_reset(vio);
539 break;
540 }
541 if (err == 0)
542 break;
543 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
544 msgbuf.tag.type,
545 msgbuf.tag.stype,
546 msgbuf.tag.stype_env,
547 msgbuf.tag.sid);
548 err = vio_validate_sid(vio, &msgbuf.tag);
549 if (err < 0)
550 break;
551
552 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
553 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
554 err = vnet_rx(port, &msgbuf);
555 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
556 err = vnet_ack(port, &msgbuf);
557 if (err > 0)
558 tx_wakeup |= err;
559 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
560 err = vnet_nack(port, &msgbuf);
561 }
562 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
563 if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
564 err = handle_mcast(port, &msgbuf);
565 else
566 err = vio_control_pkt_engine(vio, &msgbuf);
567 if (err)
568 break;
569 } else {
570 err = vnet_handle_unknown(port, &msgbuf);
571 }
572 if (err == -ECONNRESET)
573 break;
574 }
575 spin_unlock(&vio->lock);
576 if (unlikely(tx_wakeup && err != -ECONNRESET))
577 maybe_tx_wakeup(port->vp);
578 local_irq_restore(flags);
579 }
580
__vnet_tx_trigger(struct vnet_port * port)581 static int __vnet_tx_trigger(struct vnet_port *port)
582 {
583 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
584 struct vio_dring_data hdr = {
585 .tag = {
586 .type = VIO_TYPE_DATA,
587 .stype = VIO_SUBTYPE_INFO,
588 .stype_env = VIO_DRING_DATA,
589 .sid = vio_send_sid(&port->vio),
590 },
591 .dring_ident = dr->ident,
592 .start_idx = dr->prod,
593 .end_idx = (u32) -1,
594 };
595 int err, delay;
596
597 hdr.seq = dr->snd_nxt;
598 delay = 1;
599 do {
600 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
601 if (err > 0) {
602 dr->snd_nxt++;
603 break;
604 }
605 udelay(delay);
606 if ((delay <<= 1) > 128)
607 delay = 128;
608 } while (err == -EAGAIN);
609
610 return err;
611 }
612
__tx_port_find(struct vnet * vp,struct sk_buff * skb)613 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
614 {
615 unsigned int hash = vnet_hashfn(skb->data);
616 struct hlist_head *hp = &vp->port_hash[hash];
617 struct hlist_node *n;
618 struct vnet_port *port;
619
620 hlist_for_each_entry(port, n, hp, hash) {
621 if (!compare_ether_addr(port->raddr, skb->data))
622 return port;
623 }
624 port = NULL;
625 if (!list_empty(&vp->port_list))
626 port = list_entry(vp->port_list.next, struct vnet_port, list);
627
628 return port;
629 }
630
tx_port_find(struct vnet * vp,struct sk_buff * skb)631 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
632 {
633 struct vnet_port *ret;
634 unsigned long flags;
635
636 spin_lock_irqsave(&vp->lock, flags);
637 ret = __tx_port_find(vp, skb);
638 spin_unlock_irqrestore(&vp->lock, flags);
639
640 return ret;
641 }
642
vnet_start_xmit(struct sk_buff * skb,struct net_device * dev)643 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
644 {
645 struct vnet *vp = netdev_priv(dev);
646 struct vnet_port *port = tx_port_find(vp, skb);
647 struct vio_dring_state *dr;
648 struct vio_net_desc *d;
649 unsigned long flags;
650 unsigned int len;
651 void *tx_buf;
652 int i, err;
653
654 if (unlikely(!port))
655 goto out_dropped;
656
657 spin_lock_irqsave(&port->vio.lock, flags);
658
659 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
660 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
661 if (!netif_queue_stopped(dev)) {
662 netif_stop_queue(dev);
663
664 /* This is a hard error, log it. */
665 printk(KERN_ERR PFX "%s: BUG! Tx Ring full when "
666 "queue awake!\n", dev->name);
667 dev->stats.tx_errors++;
668 }
669 spin_unlock_irqrestore(&port->vio.lock, flags);
670 return NETDEV_TX_BUSY;
671 }
672
673 d = vio_dring_cur(dr);
674
675 tx_buf = port->tx_bufs[dr->prod].buf;
676 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
677
678 len = skb->len;
679 if (len < ETH_ZLEN) {
680 len = ETH_ZLEN;
681 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
682 }
683
684 d->hdr.ack = VIO_ACK_ENABLE;
685 d->size = len;
686 d->ncookies = port->tx_bufs[dr->prod].ncookies;
687 for (i = 0; i < d->ncookies; i++)
688 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
689
690 /* This has to be a non-SMP write barrier because we are writing
691 * to memory which is shared with the peer LDOM.
692 */
693 wmb();
694
695 d->hdr.state = VIO_DESC_READY;
696
697 err = __vnet_tx_trigger(port);
698 if (unlikely(err < 0)) {
699 printk(KERN_INFO PFX "%s: TX trigger error %d\n",
700 dev->name, err);
701 d->hdr.state = VIO_DESC_FREE;
702 dev->stats.tx_carrier_errors++;
703 goto out_dropped_unlock;
704 }
705
706 dev->stats.tx_packets++;
707 dev->stats.tx_bytes += skb->len;
708
709 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
710 if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
711 netif_stop_queue(dev);
712 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
713 netif_wake_queue(dev);
714 }
715
716 spin_unlock_irqrestore(&port->vio.lock, flags);
717
718 dev_kfree_skb(skb);
719
720 dev->trans_start = jiffies;
721 return NETDEV_TX_OK;
722
723 out_dropped_unlock:
724 spin_unlock_irqrestore(&port->vio.lock, flags);
725
726 out_dropped:
727 dev_kfree_skb(skb);
728 dev->stats.tx_dropped++;
729 return NETDEV_TX_OK;
730 }
731
vnet_tx_timeout(struct net_device * dev)732 static void vnet_tx_timeout(struct net_device *dev)
733 {
734 /* XXX Implement me XXX */
735 }
736
vnet_open(struct net_device * dev)737 static int vnet_open(struct net_device *dev)
738 {
739 netif_carrier_on(dev);
740 netif_start_queue(dev);
741
742 return 0;
743 }
744
vnet_close(struct net_device * dev)745 static int vnet_close(struct net_device *dev)
746 {
747 netif_stop_queue(dev);
748 netif_carrier_off(dev);
749
750 return 0;
751 }
752
__vnet_mc_find(struct vnet * vp,u8 * addr)753 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
754 {
755 struct vnet_mcast_entry *m;
756
757 for (m = vp->mcast_list; m; m = m->next) {
758 if (!memcmp(m->addr, addr, ETH_ALEN))
759 return m;
760 }
761 return NULL;
762 }
763
__update_mc_list(struct vnet * vp,struct net_device * dev)764 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
765 {
766 struct dev_addr_list *p;
767
768 for (p = dev->mc_list; p; p = p->next) {
769 struct vnet_mcast_entry *m;
770
771 m = __vnet_mc_find(vp, p->dmi_addr);
772 if (m) {
773 m->hit = 1;
774 continue;
775 }
776
777 if (!m) {
778 m = kzalloc(sizeof(*m), GFP_ATOMIC);
779 if (!m)
780 continue;
781 memcpy(m->addr, p->dmi_addr, ETH_ALEN);
782 m->hit = 1;
783
784 m->next = vp->mcast_list;
785 vp->mcast_list = m;
786 }
787 }
788 }
789
__send_mc_list(struct vnet * vp,struct vnet_port * port)790 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
791 {
792 struct vio_net_mcast_info info;
793 struct vnet_mcast_entry *m, **pp;
794 int n_addrs;
795
796 memset(&info, 0, sizeof(info));
797
798 info.tag.type = VIO_TYPE_CTRL;
799 info.tag.stype = VIO_SUBTYPE_INFO;
800 info.tag.stype_env = VNET_MCAST_INFO;
801 info.tag.sid = vio_send_sid(&port->vio);
802 info.set = 1;
803
804 n_addrs = 0;
805 for (m = vp->mcast_list; m; m = m->next) {
806 if (m->sent)
807 continue;
808 m->sent = 1;
809 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
810 m->addr, ETH_ALEN);
811 if (++n_addrs == VNET_NUM_MCAST) {
812 info.count = n_addrs;
813
814 (void) vio_ldc_send(&port->vio, &info,
815 sizeof(info));
816 n_addrs = 0;
817 }
818 }
819 if (n_addrs) {
820 info.count = n_addrs;
821 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
822 }
823
824 info.set = 0;
825
826 n_addrs = 0;
827 pp = &vp->mcast_list;
828 while ((m = *pp) != NULL) {
829 if (m->hit) {
830 m->hit = 0;
831 pp = &m->next;
832 continue;
833 }
834
835 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
836 m->addr, ETH_ALEN);
837 if (++n_addrs == VNET_NUM_MCAST) {
838 info.count = n_addrs;
839 (void) vio_ldc_send(&port->vio, &info,
840 sizeof(info));
841 n_addrs = 0;
842 }
843
844 *pp = m->next;
845 kfree(m);
846 }
847 if (n_addrs) {
848 info.count = n_addrs;
849 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
850 }
851 }
852
vnet_set_rx_mode(struct net_device * dev)853 static void vnet_set_rx_mode(struct net_device *dev)
854 {
855 struct vnet *vp = netdev_priv(dev);
856 struct vnet_port *port;
857 unsigned long flags;
858
859 spin_lock_irqsave(&vp->lock, flags);
860 if (!list_empty(&vp->port_list)) {
861 port = list_entry(vp->port_list.next, struct vnet_port, list);
862
863 if (port->switch_port) {
864 __update_mc_list(vp, dev);
865 __send_mc_list(vp, port);
866 }
867 }
868 spin_unlock_irqrestore(&vp->lock, flags);
869 }
870
vnet_change_mtu(struct net_device * dev,int new_mtu)871 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
872 {
873 if (new_mtu != ETH_DATA_LEN)
874 return -EINVAL;
875
876 dev->mtu = new_mtu;
877 return 0;
878 }
879
vnet_set_mac_addr(struct net_device * dev,void * p)880 static int vnet_set_mac_addr(struct net_device *dev, void *p)
881 {
882 return -EINVAL;
883 }
884
vnet_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)885 static void vnet_get_drvinfo(struct net_device *dev,
886 struct ethtool_drvinfo *info)
887 {
888 strcpy(info->driver, DRV_MODULE_NAME);
889 strcpy(info->version, DRV_MODULE_VERSION);
890 }
891
vnet_get_msglevel(struct net_device * dev)892 static u32 vnet_get_msglevel(struct net_device *dev)
893 {
894 struct vnet *vp = netdev_priv(dev);
895 return vp->msg_enable;
896 }
897
vnet_set_msglevel(struct net_device * dev,u32 value)898 static void vnet_set_msglevel(struct net_device *dev, u32 value)
899 {
900 struct vnet *vp = netdev_priv(dev);
901 vp->msg_enable = value;
902 }
903
904 static const struct ethtool_ops vnet_ethtool_ops = {
905 .get_drvinfo = vnet_get_drvinfo,
906 .get_msglevel = vnet_get_msglevel,
907 .set_msglevel = vnet_set_msglevel,
908 .get_link = ethtool_op_get_link,
909 };
910
vnet_port_free_tx_bufs(struct vnet_port * port)911 static void vnet_port_free_tx_bufs(struct vnet_port *port)
912 {
913 struct vio_dring_state *dr;
914 int i;
915
916 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
917 if (dr->base) {
918 ldc_free_exp_dring(port->vio.lp, dr->base,
919 (dr->entry_size * dr->num_entries),
920 dr->cookies, dr->ncookies);
921 dr->base = NULL;
922 dr->entry_size = 0;
923 dr->num_entries = 0;
924 dr->pending = 0;
925 dr->ncookies = 0;
926 }
927
928 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
929 void *buf = port->tx_bufs[i].buf;
930
931 if (!buf)
932 continue;
933
934 ldc_unmap(port->vio.lp,
935 port->tx_bufs[i].cookies,
936 port->tx_bufs[i].ncookies);
937
938 kfree(buf);
939 port->tx_bufs[i].buf = NULL;
940 }
941 }
942
vnet_port_alloc_tx_bufs(struct vnet_port * port)943 static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
944 {
945 struct vio_dring_state *dr;
946 unsigned long len;
947 int i, err, ncookies;
948 void *dring;
949
950 for (i = 0; i < VNET_TX_RING_SIZE; i++) {
951 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
952 int map_len = (ETH_FRAME_LEN + 7) & ~7;
953
954 err = -ENOMEM;
955 if (!buf) {
956 printk(KERN_ERR "TX buffer allocation failure\n");
957 goto err_out;
958 }
959 err = -EFAULT;
960 if ((unsigned long)buf & (8UL - 1)) {
961 printk(KERN_ERR "TX buffer misaligned\n");
962 kfree(buf);
963 goto err_out;
964 }
965
966 err = ldc_map_single(port->vio.lp, buf, map_len,
967 port->tx_bufs[i].cookies, 2,
968 (LDC_MAP_SHADOW |
969 LDC_MAP_DIRECT |
970 LDC_MAP_RW));
971 if (err < 0) {
972 kfree(buf);
973 goto err_out;
974 }
975 port->tx_bufs[i].buf = buf;
976 port->tx_bufs[i].ncookies = err;
977 }
978
979 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
980
981 len = (VNET_TX_RING_SIZE *
982 (sizeof(struct vio_net_desc) +
983 (sizeof(struct ldc_trans_cookie) * 2)));
984
985 ncookies = VIO_MAX_RING_COOKIES;
986 dring = ldc_alloc_exp_dring(port->vio.lp, len,
987 dr->cookies, &ncookies,
988 (LDC_MAP_SHADOW |
989 LDC_MAP_DIRECT |
990 LDC_MAP_RW));
991 if (IS_ERR(dring)) {
992 err = PTR_ERR(dring);
993 goto err_out;
994 }
995
996 dr->base = dring;
997 dr->entry_size = (sizeof(struct vio_net_desc) +
998 (sizeof(struct ldc_trans_cookie) * 2));
999 dr->num_entries = VNET_TX_RING_SIZE;
1000 dr->prod = dr->cons = 0;
1001 dr->pending = VNET_TX_RING_SIZE;
1002 dr->ncookies = ncookies;
1003
1004 return 0;
1005
1006 err_out:
1007 vnet_port_free_tx_bufs(port);
1008
1009 return err;
1010 }
1011
1012 static LIST_HEAD(vnet_list);
1013 static DEFINE_MUTEX(vnet_list_mutex);
1014
vnet_new(const u64 * local_mac)1015 static struct vnet * __devinit vnet_new(const u64 *local_mac)
1016 {
1017 struct net_device *dev;
1018 struct vnet *vp;
1019 int err, i;
1020
1021 dev = alloc_etherdev(sizeof(*vp));
1022 if (!dev) {
1023 printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
1024 return ERR_PTR(-ENOMEM);
1025 }
1026
1027 for (i = 0; i < ETH_ALEN; i++)
1028 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1029
1030 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
1031
1032 vp = netdev_priv(dev);
1033
1034 spin_lock_init(&vp->lock);
1035 vp->dev = dev;
1036
1037 INIT_LIST_HEAD(&vp->port_list);
1038 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1039 INIT_HLIST_HEAD(&vp->port_hash[i]);
1040 INIT_LIST_HEAD(&vp->list);
1041 vp->local_mac = *local_mac;
1042
1043 dev->open = vnet_open;
1044 dev->stop = vnet_close;
1045 dev->set_multicast_list = vnet_set_rx_mode;
1046 dev->set_mac_address = vnet_set_mac_addr;
1047 dev->tx_timeout = vnet_tx_timeout;
1048 dev->ethtool_ops = &vnet_ethtool_ops;
1049 dev->watchdog_timeo = VNET_TX_TIMEOUT;
1050 dev->change_mtu = vnet_change_mtu;
1051 dev->hard_start_xmit = vnet_start_xmit;
1052
1053 err = register_netdev(dev);
1054 if (err) {
1055 printk(KERN_ERR PFX "Cannot register net device, "
1056 "aborting.\n");
1057 goto err_out_free_dev;
1058 }
1059
1060 printk(KERN_INFO "%s: Sun LDOM vnet ", dev->name);
1061
1062 for (i = 0; i < 6; i++)
1063 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
1064
1065 list_add(&vp->list, &vnet_list);
1066
1067 return vp;
1068
1069 err_out_free_dev:
1070 free_netdev(dev);
1071
1072 return ERR_PTR(err);
1073 }
1074
vnet_find_or_create(const u64 * local_mac)1075 static struct vnet * __devinit vnet_find_or_create(const u64 *local_mac)
1076 {
1077 struct vnet *iter, *vp;
1078
1079 mutex_lock(&vnet_list_mutex);
1080 vp = NULL;
1081 list_for_each_entry(iter, &vnet_list, list) {
1082 if (iter->local_mac == *local_mac) {
1083 vp = iter;
1084 break;
1085 }
1086 }
1087 if (!vp)
1088 vp = vnet_new(local_mac);
1089 mutex_unlock(&vnet_list_mutex);
1090
1091 return vp;
1092 }
1093
1094 static const char *local_mac_prop = "local-mac-address";
1095
vnet_find_parent(struct mdesc_handle * hp,u64 port_node)1096 static struct vnet * __devinit vnet_find_parent(struct mdesc_handle *hp,
1097 u64 port_node)
1098 {
1099 const u64 *local_mac = NULL;
1100 u64 a;
1101
1102 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1103 u64 target = mdesc_arc_target(hp, a);
1104 const char *name;
1105
1106 name = mdesc_get_property(hp, target, "name", NULL);
1107 if (!name || strcmp(name, "network"))
1108 continue;
1109
1110 local_mac = mdesc_get_property(hp, target,
1111 local_mac_prop, NULL);
1112 if (local_mac)
1113 break;
1114 }
1115 if (!local_mac)
1116 return ERR_PTR(-ENODEV);
1117
1118 return vnet_find_or_create(local_mac);
1119 }
1120
1121 static struct ldc_channel_config vnet_ldc_cfg = {
1122 .event = vnet_event,
1123 .mtu = 64,
1124 .mode = LDC_MODE_UNRELIABLE,
1125 };
1126
1127 static struct vio_driver_ops vnet_vio_ops = {
1128 .send_attr = vnet_send_attr,
1129 .handle_attr = vnet_handle_attr,
1130 .handshake_complete = vnet_handshake_complete,
1131 };
1132
print_version(void)1133 static void __devinit print_version(void)
1134 {
1135 static int version_printed;
1136
1137 if (version_printed++ == 0)
1138 printk(KERN_INFO "%s", version);
1139 }
1140
1141 const char *remote_macaddr_prop = "remote-mac-address";
1142
vnet_port_probe(struct vio_dev * vdev,const struct vio_device_id * id)1143 static int __devinit vnet_port_probe(struct vio_dev *vdev,
1144 const struct vio_device_id *id)
1145 {
1146 struct mdesc_handle *hp;
1147 struct vnet_port *port;
1148 unsigned long flags;
1149 struct vnet *vp;
1150 const u64 *rmac;
1151 int len, i, err, switch_port;
1152
1153 print_version();
1154
1155 hp = mdesc_grab();
1156
1157 vp = vnet_find_parent(hp, vdev->mp);
1158 if (IS_ERR(vp)) {
1159 printk(KERN_ERR PFX "Cannot find port parent vnet.\n");
1160 err = PTR_ERR(vp);
1161 goto err_out_put_mdesc;
1162 }
1163
1164 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1165 err = -ENODEV;
1166 if (!rmac) {
1167 printk(KERN_ERR PFX "Port lacks %s property.\n",
1168 remote_macaddr_prop);
1169 goto err_out_put_mdesc;
1170 }
1171
1172 port = kzalloc(sizeof(*port), GFP_KERNEL);
1173 err = -ENOMEM;
1174 if (!port) {
1175 printk(KERN_ERR PFX "Cannot allocate vnet_port.\n");
1176 goto err_out_put_mdesc;
1177 }
1178
1179 for (i = 0; i < ETH_ALEN; i++)
1180 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1181
1182 port->vp = vp;
1183
1184 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1185 vnet_versions, ARRAY_SIZE(vnet_versions),
1186 &vnet_vio_ops, vp->dev->name);
1187 if (err)
1188 goto err_out_free_port;
1189
1190 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1191 if (err)
1192 goto err_out_free_port;
1193
1194 err = vnet_port_alloc_tx_bufs(port);
1195 if (err)
1196 goto err_out_free_ldc;
1197
1198 INIT_HLIST_NODE(&port->hash);
1199 INIT_LIST_HEAD(&port->list);
1200
1201 switch_port = 0;
1202 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1203 switch_port = 1;
1204 port->switch_port = switch_port;
1205
1206 spin_lock_irqsave(&vp->lock, flags);
1207 if (switch_port)
1208 list_add(&port->list, &vp->port_list);
1209 else
1210 list_add_tail(&port->list, &vp->port_list);
1211 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1212 spin_unlock_irqrestore(&vp->lock, flags);
1213
1214 dev_set_drvdata(&vdev->dev, port);
1215
1216 printk(KERN_INFO "%s: PORT ( remote-mac %pM%s )\n",
1217 vp->dev->name, port->raddr,
1218 switch_port ? " switch-port" : "");
1219
1220 vio_port_up(&port->vio);
1221
1222 mdesc_release(hp);
1223
1224 return 0;
1225
1226 err_out_free_ldc:
1227 vio_ldc_free(&port->vio);
1228
1229 err_out_free_port:
1230 kfree(port);
1231
1232 err_out_put_mdesc:
1233 mdesc_release(hp);
1234 return err;
1235 }
1236
vnet_port_remove(struct vio_dev * vdev)1237 static int vnet_port_remove(struct vio_dev *vdev)
1238 {
1239 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1240
1241 if (port) {
1242 struct vnet *vp = port->vp;
1243 unsigned long flags;
1244
1245 del_timer_sync(&port->vio.timer);
1246
1247 spin_lock_irqsave(&vp->lock, flags);
1248 list_del(&port->list);
1249 hlist_del(&port->hash);
1250 spin_unlock_irqrestore(&vp->lock, flags);
1251
1252 vnet_port_free_tx_bufs(port);
1253 vio_ldc_free(&port->vio);
1254
1255 dev_set_drvdata(&vdev->dev, NULL);
1256
1257 kfree(port);
1258 }
1259 return 0;
1260 }
1261
1262 static const struct vio_device_id vnet_port_match[] = {
1263 {
1264 .type = "vnet-port",
1265 },
1266 {},
1267 };
1268 MODULE_DEVICE_TABLE(vio, vnet_port_match);
1269
1270 static struct vio_driver vnet_port_driver = {
1271 .id_table = vnet_port_match,
1272 .probe = vnet_port_probe,
1273 .remove = vnet_port_remove,
1274 .driver = {
1275 .name = "vnet_port",
1276 .owner = THIS_MODULE,
1277 }
1278 };
1279
vnet_init(void)1280 static int __init vnet_init(void)
1281 {
1282 return vio_register_driver(&vnet_port_driver);
1283 }
1284
vnet_exit(void)1285 static void __exit vnet_exit(void)
1286 {
1287 vio_unregister_driver(&vnet_port_driver);
1288 }
1289
1290 module_init(vnet_init);
1291 module_exit(vnet_exit);
1292