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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6/mini2440.git] / drivers / net / rionet.c
blobec59e29807a67ad94a79ded9d2487856ae436ec9
1 /*
2 * rionet - Ethernet driver over RapidIO messaging services
3 *
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/delay.h>
17 #include <linux/rio.h>
18 #include <linux/rio_drv.h>
19 #include <linux/rio_ids.h>
20
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
23 #include <linux/skbuff.h>
24 #include <linux/crc32.h>
25 #include <linux/ethtool.h>
26
27 #define DRV_NAME "rionet"
28 #define DRV_VERSION "0.2"
29 #define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
30 #define DRV_DESC "Ethernet over RapidIO"
31
32 MODULE_AUTHOR(DRV_AUTHOR);
33 MODULE_DESCRIPTION(DRV_DESC);
34 MODULE_LICENSE("GPL");
35
36 #define RIONET_DEFAULT_MSGLEVEL \
37 (NETIF_MSG_DRV | \
38 NETIF_MSG_LINK | \
39 NETIF_MSG_RX_ERR | \
40 NETIF_MSG_TX_ERR)
41
42 #define RIONET_DOORBELL_JOIN 0x1000
43 #define RIONET_DOORBELL_LEAVE 0x1001
44
45 #define RIONET_MAILBOX 0
46
47 #define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
48 #define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
49
50 static LIST_HEAD(rionet_peers);
51
52 struct rionet_private {
53 struct rio_mport *mport;
54 struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
55 struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
56 int rx_slot;
57 int tx_slot;
58 int tx_cnt;
59 int ack_slot;
60 spinlock_t lock;
61 spinlock_t tx_lock;
62 u32 msg_enable;
63 };
64
65 struct rionet_peer {
66 struct list_head node;
67 struct rio_dev *rdev;
68 struct resource *res;
69 };
70
71 static int rionet_check = 0;
72 static int rionet_capable = 1;
73
74 /*
75 * This is a fast lookup table for for translating TX
76 * Ethernet packets into a destination RIO device. It
77 * could be made into a hash table to save memory depending
78 * on system trade-offs.
79 */
80 static struct rio_dev **rionet_active;
81
82 #define is_rionet_capable(pef, src_ops, dst_ops) \
83 ((pef & RIO_PEF_INB_MBOX) && \
84 (pef & RIO_PEF_INB_DOORBELL) && \
85 (src_ops & RIO_SRC_OPS_DOORBELL) && \
86 (dst_ops & RIO_DST_OPS_DOORBELL))
87 #define dev_rionet_capable(dev) \
88 is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
89
90 #define RIONET_MAC_MATCH(x) (*(u32 *)x == 0x00010001)
91 #define RIONET_GET_DESTID(x) (*(u16 *)(x + 4))
92
93 static int rionet_rx_clean(struct net_device *ndev)
94 {
95 int i;
96 int error = 0;
97 struct rionet_private *rnet = netdev_priv(ndev);
98 void *data;
99
100 i = rnet->rx_slot;
101
102 do {
103 if (!rnet->rx_skb[i])
104 continue;
105
106 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
107 break;
108
109 rnet->rx_skb[i]->data = data;
110 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
111 rnet->rx_skb[i]->protocol =
112 eth_type_trans(rnet->rx_skb[i], ndev);
113 error = netif_rx(rnet->rx_skb[i]);
114
115 if (error == NET_RX_DROP) {
116 ndev->stats.rx_dropped++;
117 } else if (error == NET_RX_BAD) {
118 if (netif_msg_rx_err(rnet))
119 printk(KERN_WARNING "%s: bad rx packet\n",
120 DRV_NAME);
121 ndev->stats.rx_errors++;
122 } else {
123 ndev->stats.rx_packets++;
124 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
125 }
126
127 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
128
129 return i;
130 }
131
132 static void rionet_rx_fill(struct net_device *ndev, int end)
133 {
134 int i;
135 struct rionet_private *rnet = netdev_priv(ndev);
136
137 i = rnet->rx_slot;
138 do {
139 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
140
141 if (!rnet->rx_skb[i])
142 break;
143
144 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
145 rnet->rx_skb[i]->data);
146 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
147
148 rnet->rx_slot = i;
149 }
150
151 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
152 struct rio_dev *rdev)
153 {
154 struct rionet_private *rnet = netdev_priv(ndev);
155
156 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
157 rnet->tx_skb[rnet->tx_slot] = skb;
158
159 ndev->stats.tx_packets++;
160 ndev->stats.tx_bytes += skb->len;
161
162 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
163 netif_stop_queue(ndev);
164
165 ++rnet->tx_slot;
166 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
167
168 if (netif_msg_tx_queued(rnet))
169 printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
170 (u32) skb, skb->len);
171
172 return 0;
173 }
174
175 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
176 {
177 int i;
178 struct rionet_private *rnet = netdev_priv(ndev);
179 struct ethhdr *eth = (struct ethhdr *)skb->data;
180 u16 destid;
181 unsigned long flags;
182
183 local_irq_save(flags);
184 if (!spin_trylock(&rnet->tx_lock)) {
185 local_irq_restore(flags);
186 return NETDEV_TX_LOCKED;
187 }
188
189 if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
190 netif_stop_queue(ndev);
191 spin_unlock_irqrestore(&rnet->tx_lock, flags);
192 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
193 ndev->name);
194 return NETDEV_TX_BUSY;
195 }
196
197 if (eth->h_dest[0] & 0x01) {
198 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
199 i++)
200 if (rionet_active[i])
201 rionet_queue_tx_msg(skb, ndev,
202 rionet_active[i]);
203 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
204 destid = RIONET_GET_DESTID(eth->h_dest);
205 if (rionet_active[destid])
206 rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
207 }
208
209 spin_unlock_irqrestore(&rnet->tx_lock, flags);
210
211 return 0;
212 }
213
214 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
215 u16 info)
216 {
217 struct net_device *ndev = dev_id;
218 struct rionet_private *rnet = netdev_priv(ndev);
219 struct rionet_peer *peer;
220
221 if (netif_msg_intr(rnet))
222 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
223 DRV_NAME, sid, tid, info);
224 if (info == RIONET_DOORBELL_JOIN) {
225 if (!rionet_active[sid]) {
226 list_for_each_entry(peer, &rionet_peers, node) {
227 if (peer->rdev->destid == sid)
228 rionet_active[sid] = peer->rdev;
229 }
230 rio_mport_send_doorbell(mport, sid,
231 RIONET_DOORBELL_JOIN);
232 }
233 } else if (info == RIONET_DOORBELL_LEAVE) {
234 rionet_active[sid] = NULL;
235 } else {
236 if (netif_msg_intr(rnet))
237 printk(KERN_WARNING "%s: unhandled doorbell\n",
238 DRV_NAME);
239 }
240 }
241
242 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
243 {
244 int n;
245 struct net_device *ndev = dev_id;
246 struct rionet_private *rnet = netdev_priv(ndev);
247
248 if (netif_msg_intr(rnet))
249 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
250 DRV_NAME, mbox, slot);
251
252 spin_lock(&rnet->lock);
253 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
254 rionet_rx_fill(ndev, n);
255 spin_unlock(&rnet->lock);
256 }
257
258 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
259 {
260 struct net_device *ndev = dev_id;
261 struct rionet_private *rnet = netdev_priv(ndev);
262
263 spin_lock(&rnet->lock);
264
265 if (netif_msg_intr(rnet))
266 printk(KERN_INFO
267 "%s: outbound message event, mbox %d slot %d\n",
268 DRV_NAME, mbox, slot);
269
270 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
271 /* dma unmap single */
272 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
273 rnet->tx_skb[rnet->ack_slot] = NULL;
274 ++rnet->ack_slot;
275 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
276 rnet->tx_cnt--;
277 }
278
279 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
280 netif_wake_queue(ndev);
281
282 spin_unlock(&rnet->lock);
283 }
284
285 static int rionet_open(struct net_device *ndev)
286 {
287 int i, rc = 0;
288 struct rionet_peer *peer, *tmp;
289 u32 pwdcsr;
290 struct rionet_private *rnet = netdev_priv(ndev);
291
292 if (netif_msg_ifup(rnet))
293 printk(KERN_INFO "%s: open\n", DRV_NAME);
294
295 if ((rc = rio_request_inb_dbell(rnet->mport,
296 (void *)ndev,
297 RIONET_DOORBELL_JOIN,
298 RIONET_DOORBELL_LEAVE,
299 rionet_dbell_event)) < 0)
300 goto out;
301
302 if ((rc = rio_request_inb_mbox(rnet->mport,
303 (void *)ndev,
304 RIONET_MAILBOX,
305 RIONET_RX_RING_SIZE,
306 rionet_inb_msg_event)) < 0)
307 goto out;
308
309 if ((rc = rio_request_outb_mbox(rnet->mport,
310 (void *)ndev,
311 RIONET_MAILBOX,
312 RIONET_TX_RING_SIZE,
313 rionet_outb_msg_event)) < 0)
314 goto out;
315
316 /* Initialize inbound message ring */
317 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
318 rnet->rx_skb[i] = NULL;
319 rnet->rx_slot = 0;
320 rionet_rx_fill(ndev, 0);
321
322 rnet->tx_slot = 0;
323 rnet->tx_cnt = 0;
324 rnet->ack_slot = 0;
325
326 netif_carrier_on(ndev);
327 netif_start_queue(ndev);
328
329 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
330 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
331 RIONET_DOORBELL_JOIN,
332 RIONET_DOORBELL_LEAVE)))
333 {
334 printk(KERN_ERR "%s: error requesting doorbells\n",
335 DRV_NAME);
336 continue;
337 }
338
339 /*
340 * If device has initialized inbound doorbells,
341 * send a join message
342 */
343 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
344 if (pwdcsr & RIO_DOORBELL_AVAIL)
345 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
346 }
347
348 out:
349 return rc;
350 }
351
352 static int rionet_close(struct net_device *ndev)
353 {
354 struct rionet_private *rnet = netdev_priv(ndev);
355 struct rionet_peer *peer, *tmp;
356 int i;
357
358 if (netif_msg_ifup(rnet))
359 printk(KERN_INFO "%s: close\n", DRV_NAME);
360
361 netif_stop_queue(ndev);
362 netif_carrier_off(ndev);
363
364 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
365 kfree_skb(rnet->rx_skb[i]);
366
367 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
368 if (rionet_active[peer->rdev->destid]) {
369 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
370 rionet_active[peer->rdev->destid] = NULL;
371 }
372 rio_release_outb_dbell(peer->rdev, peer->res);
373 }
374
375 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
376 RIONET_DOORBELL_LEAVE);
377 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
378 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
379
380 return 0;
381 }
382
383 static void rionet_remove(struct rio_dev *rdev)
384 {
385 struct net_device *ndev = NULL;
386 struct rionet_peer *peer, *tmp;
387
388 free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
389 __ilog2(sizeof(void *)) + 4 : 0);
390 unregister_netdev(ndev);
391 kfree(ndev);
392
393 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
394 list_del(&peer->node);
395 kfree(peer);
396 }
397 }
398
399 static void rionet_get_drvinfo(struct net_device *ndev,
400 struct ethtool_drvinfo *info)
401 {
402 struct rionet_private *rnet = netdev_priv(ndev);
403
404 strcpy(info->driver, DRV_NAME);
405 strcpy(info->version, DRV_VERSION);
406 strcpy(info->fw_version, "n/a");
407 strcpy(info->bus_info, rnet->mport->name);
408 }
409
410 static u32 rionet_get_msglevel(struct net_device *ndev)
411 {
412 struct rionet_private *rnet = netdev_priv(ndev);
413
414 return rnet->msg_enable;
415 }
416
417 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
418 {
419 struct rionet_private *rnet = netdev_priv(ndev);
420
421 rnet->msg_enable = value;
422 }
423
424 static const struct ethtool_ops rionet_ethtool_ops = {
425 .get_drvinfo = rionet_get_drvinfo,
426 .get_msglevel = rionet_get_msglevel,
427 .set_msglevel = rionet_set_msglevel,
428 .get_link = ethtool_op_get_link,
429 };
430
431 static int rionet_setup_netdev(struct rio_mport *mport)
432 {
433 int rc = 0;
434 struct net_device *ndev = NULL;
435 struct rionet_private *rnet;
436 u16 device_id;
437
438 /* Allocate our net_device structure */
439 ndev = alloc_etherdev(sizeof(struct rionet_private));
440 if (ndev == NULL) {
441 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
442 DRV_NAME);
443 rc = -ENOMEM;
444 goto out;
445 }
446
447 rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
448 mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
449 if (!rionet_active) {
450 rc = -ENOMEM;
451 goto out;
452 }
453 memset((void *)rionet_active, 0, sizeof(void *) *
454 RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
455
456 /* Set up private area */
457 rnet = netdev_priv(ndev);
458 rnet->mport = mport;
459
460 /* Set the default MAC address */
461 device_id = rio_local_get_device_id(mport);
462 ndev->dev_addr[0] = 0x00;
463 ndev->dev_addr[1] = 0x01;
464 ndev->dev_addr[2] = 0x00;
465 ndev->dev_addr[3] = 0x01;
466 ndev->dev_addr[4] = device_id >> 8;
467 ndev->dev_addr[5] = device_id & 0xff;
468
469 /* Fill in the driver function table */
470 ndev->open = &rionet_open;
471 ndev->hard_start_xmit = &rionet_start_xmit;
472 ndev->stop = &rionet_close;
473 ndev->mtu = RIO_MAX_MSG_SIZE - 14;
474 ndev->features = NETIF_F_LLTX;
475 SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
476
477 spin_lock_init(&rnet->lock);
478 spin_lock_init(&rnet->tx_lock);
479
480 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
481
482 rc = register_netdev(ndev);
483 if (rc != 0)
484 goto out;
485
486 printk("%s: %s %s Version %s, MAC %pM\n",
487 ndev->name,
488 DRV_NAME,
489 DRV_DESC,
490 DRV_VERSION,
491 ndev->dev_addr);
492
493 out:
494 return rc;
495 }
496
497 /*
498 * XXX Make multi-net safe
499 */
500 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
501 {
502 int rc = -ENODEV;
503 u32 lpef, lsrc_ops, ldst_ops;
504 struct rionet_peer *peer;
505
506 /* If local device is not rionet capable, give up quickly */
507 if (!rionet_capable)
508 goto out;
509
510 /*
511 * First time through, make sure local device is rionet
512 * capable, setup netdev, and set flags so this is skipped
513 * on later probes
514 */
515 if (!rionet_check) {
516 rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
517 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
518 &lsrc_ops);
519 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
520 &ldst_ops);
521 if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
522 printk(KERN_ERR
523 "%s: local device is not network capable\n",
524 DRV_NAME);
525 rionet_check = 1;
526 rionet_capable = 0;
527 goto out;
528 }
529
530 rc = rionet_setup_netdev(rdev->net->hport);
531 rionet_check = 1;
532 }
533
534 /*
535 * If the remote device has mailbox/doorbell capabilities,
536 * add it to the peer list.
537 */
538 if (dev_rionet_capable(rdev)) {
539 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
540 rc = -ENOMEM;
541 goto out;
542 }
543 peer->rdev = rdev;
544 list_add_tail(&peer->node, &rionet_peers);
545 }
546
547 out:
548 return rc;
549 }
550
551 static struct rio_device_id rionet_id_table[] = {
552 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
553 };
554
555 static struct rio_driver rionet_driver = {
556 .name = "rionet",
557 .id_table = rionet_id_table,
558 .probe = rionet_probe,
559 .remove = rionet_remove,
560 };
561
562 static int __init rionet_init(void)
563 {
564 return rio_register_driver(&rionet_driver);
565 }
566
567 static void __exit rionet_exit(void)
568 {
569 rio_unregister_driver(&rionet_driver);
570 }
571
572 module_init(rionet_init);
573 module_exit(rionet_exit);
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