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Merge branch 'sched/core'
[linux-2.6/x86.git] / drivers / net / rionet.c
blob86ac38c96bcf040b59027332b614925aeee71293
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/slab.h>
20 #include <linux/rio_ids.h>
21
22 #include <linux/netdevice.h>
23 #include <linux/etherdevice.h>
24 #include <linux/skbuff.h>
25 #include <linux/crc32.h>
26 #include <linux/ethtool.h>
27
28 #define DRV_NAME "rionet"
29 #define DRV_VERSION "0.2"
30 #define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
31 #define DRV_DESC "Ethernet over RapidIO"
32
33 MODULE_AUTHOR(DRV_AUTHOR);
34 MODULE_DESCRIPTION(DRV_DESC);
35 MODULE_LICENSE("GPL");
36
37 #define RIONET_DEFAULT_MSGLEVEL \
38 (NETIF_MSG_DRV | \
39 NETIF_MSG_LINK | \
40 NETIF_MSG_RX_ERR | \
41 NETIF_MSG_TX_ERR)
42
43 #define RIONET_DOORBELL_JOIN 0x1000
44 #define RIONET_DOORBELL_LEAVE 0x1001
45
46 #define RIONET_MAILBOX 0
47
48 #define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
49 #define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
50
51 static LIST_HEAD(rionet_peers);
52
53 struct rionet_private {
54 struct rio_mport *mport;
55 struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
56 struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
57 int rx_slot;
58 int tx_slot;
59 int tx_cnt;
60 int ack_slot;
61 spinlock_t lock;
62 spinlock_t tx_lock;
63 u32 msg_enable;
64 };
65
66 struct rionet_peer {
67 struct list_head node;
68 struct rio_dev *rdev;
69 struct resource *res;
70 };
71
72 static int rionet_check = 0;
73 static int rionet_capable = 1;
74
75 /*
76 * This is a fast lookup table for translating TX
77 * Ethernet packets into a destination RIO device. It
78 * could be made into a hash table to save memory depending
79 * on system trade-offs.
80 */
81 static struct rio_dev **rionet_active;
82
83 #define is_rionet_capable(pef, src_ops, dst_ops) \
84 ((pef & RIO_PEF_INB_MBOX) && \
85 (pef & RIO_PEF_INB_DOORBELL) && \
86 (src_ops & RIO_SRC_OPS_DOORBELL) && \
87 (dst_ops & RIO_DST_OPS_DOORBELL))
88 #define dev_rionet_capable(dev) \
89 is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
90
91 #define RIONET_MAC_MATCH(x) (*(u32 *)x == 0x00010001)
92 #define RIONET_GET_DESTID(x) (*(u16 *)(x + 4))
93
94 static int rionet_rx_clean(struct net_device *ndev)
95 {
96 int i;
97 int error = 0;
98 struct rionet_private *rnet = netdev_priv(ndev);
99 void *data;
100
101 i = rnet->rx_slot;
102
103 do {
104 if (!rnet->rx_skb[i])
105 continue;
106
107 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
108 break;
109
110 rnet->rx_skb[i]->data = data;
111 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
112 rnet->rx_skb[i]->protocol =
113 eth_type_trans(rnet->rx_skb[i], ndev);
114 error = netif_rx(rnet->rx_skb[i]);
115
116 if (error == NET_RX_DROP) {
117 ndev->stats.rx_dropped++;
118 } else {
119 ndev->stats.rx_packets++;
120 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
121 }
122
123 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
124
125 return i;
126 }
127
128 static void rionet_rx_fill(struct net_device *ndev, int end)
129 {
130 int i;
131 struct rionet_private *rnet = netdev_priv(ndev);
132
133 i = rnet->rx_slot;
134 do {
135 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
136
137 if (!rnet->rx_skb[i])
138 break;
139
140 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
141 rnet->rx_skb[i]->data);
142 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
143
144 rnet->rx_slot = i;
145 }
146
147 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
148 struct rio_dev *rdev)
149 {
150 struct rionet_private *rnet = netdev_priv(ndev);
151
152 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
153 rnet->tx_skb[rnet->tx_slot] = skb;
154
155 ndev->stats.tx_packets++;
156 ndev->stats.tx_bytes += skb->len;
157
158 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
159 netif_stop_queue(ndev);
160
161 ++rnet->tx_slot;
162 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
163
164 if (netif_msg_tx_queued(rnet))
165 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
166 skb->len);
167
168 return 0;
169 }
170
171 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
172 {
173 int i;
174 struct rionet_private *rnet = netdev_priv(ndev);
175 struct ethhdr *eth = (struct ethhdr *)skb->data;
176 u16 destid;
177 unsigned long flags;
178
179 local_irq_save(flags);
180 if (!spin_trylock(&rnet->tx_lock)) {
181 local_irq_restore(flags);
182 return NETDEV_TX_LOCKED;
183 }
184
185 if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
186 netif_stop_queue(ndev);
187 spin_unlock_irqrestore(&rnet->tx_lock, flags);
188 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
189 ndev->name);
190 return NETDEV_TX_BUSY;
191 }
192
193 if (is_multicast_ether_addr(eth->h_dest)) {
194 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
195 i++)
196 if (rionet_active[i])
197 rionet_queue_tx_msg(skb, ndev,
198 rionet_active[i]);
199 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
200 destid = RIONET_GET_DESTID(eth->h_dest);
201 if (rionet_active[destid])
202 rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
203 }
204
205 spin_unlock_irqrestore(&rnet->tx_lock, flags);
206
207 return NETDEV_TX_OK;
208 }
209
210 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
211 u16 info)
212 {
213 struct net_device *ndev = dev_id;
214 struct rionet_private *rnet = netdev_priv(ndev);
215 struct rionet_peer *peer;
216
217 if (netif_msg_intr(rnet))
218 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
219 DRV_NAME, sid, tid, info);
220 if (info == RIONET_DOORBELL_JOIN) {
221 if (!rionet_active[sid]) {
222 list_for_each_entry(peer, &rionet_peers, node) {
223 if (peer->rdev->destid == sid)
224 rionet_active[sid] = peer->rdev;
225 }
226 rio_mport_send_doorbell(mport, sid,
227 RIONET_DOORBELL_JOIN);
228 }
229 } else if (info == RIONET_DOORBELL_LEAVE) {
230 rionet_active[sid] = NULL;
231 } else {
232 if (netif_msg_intr(rnet))
233 printk(KERN_WARNING "%s: unhandled doorbell\n",
234 DRV_NAME);
235 }
236 }
237
238 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
239 {
240 int n;
241 struct net_device *ndev = dev_id;
242 struct rionet_private *rnet = netdev_priv(ndev);
243
244 if (netif_msg_intr(rnet))
245 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
246 DRV_NAME, mbox, slot);
247
248 spin_lock(&rnet->lock);
249 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
250 rionet_rx_fill(ndev, n);
251 spin_unlock(&rnet->lock);
252 }
253
254 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
255 {
256 struct net_device *ndev = dev_id;
257 struct rionet_private *rnet = netdev_priv(ndev);
258
259 spin_lock(&rnet->lock);
260
261 if (netif_msg_intr(rnet))
262 printk(KERN_INFO
263 "%s: outbound message event, mbox %d slot %d\n",
264 DRV_NAME, mbox, slot);
265
266 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
267 /* dma unmap single */
268 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
269 rnet->tx_skb[rnet->ack_slot] = NULL;
270 ++rnet->ack_slot;
271 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
272 rnet->tx_cnt--;
273 }
274
275 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
276 netif_wake_queue(ndev);
277
278 spin_unlock(&rnet->lock);
279 }
280
281 static int rionet_open(struct net_device *ndev)
282 {
283 int i, rc = 0;
284 struct rionet_peer *peer, *tmp;
285 u32 pwdcsr;
286 struct rionet_private *rnet = netdev_priv(ndev);
287
288 if (netif_msg_ifup(rnet))
289 printk(KERN_INFO "%s: open\n", DRV_NAME);
290
291 if ((rc = rio_request_inb_dbell(rnet->mport,
292 (void *)ndev,
293 RIONET_DOORBELL_JOIN,
294 RIONET_DOORBELL_LEAVE,
295 rionet_dbell_event)) < 0)
296 goto out;
297
298 if ((rc = rio_request_inb_mbox(rnet->mport,
299 (void *)ndev,
300 RIONET_MAILBOX,
301 RIONET_RX_RING_SIZE,
302 rionet_inb_msg_event)) < 0)
303 goto out;
304
305 if ((rc = rio_request_outb_mbox(rnet->mport,
306 (void *)ndev,
307 RIONET_MAILBOX,
308 RIONET_TX_RING_SIZE,
309 rionet_outb_msg_event)) < 0)
310 goto out;
311
312 /* Initialize inbound message ring */
313 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
314 rnet->rx_skb[i] = NULL;
315 rnet->rx_slot = 0;
316 rionet_rx_fill(ndev, 0);
317
318 rnet->tx_slot = 0;
319 rnet->tx_cnt = 0;
320 rnet->ack_slot = 0;
321
322 netif_carrier_on(ndev);
323 netif_start_queue(ndev);
324
325 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
326 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
327 RIONET_DOORBELL_JOIN,
328 RIONET_DOORBELL_LEAVE)))
329 {
330 printk(KERN_ERR "%s: error requesting doorbells\n",
331 DRV_NAME);
332 continue;
333 }
334
335 /*
336 * If device has initialized inbound doorbells,
337 * send a join message
338 */
339 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
340 if (pwdcsr & RIO_DOORBELL_AVAIL)
341 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
342 }
343
344 out:
345 return rc;
346 }
347
348 static int rionet_close(struct net_device *ndev)
349 {
350 struct rionet_private *rnet = netdev_priv(ndev);
351 struct rionet_peer *peer, *tmp;
352 int i;
353
354 if (netif_msg_ifup(rnet))
355 printk(KERN_INFO "%s: close\n", DRV_NAME);
356
357 netif_stop_queue(ndev);
358 netif_carrier_off(ndev);
359
360 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
361 kfree_skb(rnet->rx_skb[i]);
362
363 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
364 if (rionet_active[peer->rdev->destid]) {
365 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
366 rionet_active[peer->rdev->destid] = NULL;
367 }
368 rio_release_outb_dbell(peer->rdev, peer->res);
369 }
370
371 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
372 RIONET_DOORBELL_LEAVE);
373 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
374 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
375
376 return 0;
377 }
378
379 static void rionet_remove(struct rio_dev *rdev)
380 {
381 struct net_device *ndev = rio_get_drvdata(rdev);
382 struct rionet_peer *peer, *tmp;
383
384 free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
385 __fls(sizeof(void *)) + 4 : 0);
386 unregister_netdev(ndev);
387 free_netdev(ndev);
388
389 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
390 list_del(&peer->node);
391 kfree(peer);
392 }
393 }
394
395 static void rionet_get_drvinfo(struct net_device *ndev,
396 struct ethtool_drvinfo *info)
397 {
398 struct rionet_private *rnet = netdev_priv(ndev);
399
400 strcpy(info->driver, DRV_NAME);
401 strcpy(info->version, DRV_VERSION);
402 strcpy(info->fw_version, "n/a");
403 strcpy(info->bus_info, rnet->mport->name);
404 }
405
406 static u32 rionet_get_msglevel(struct net_device *ndev)
407 {
408 struct rionet_private *rnet = netdev_priv(ndev);
409
410 return rnet->msg_enable;
411 }
412
413 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
414 {
415 struct rionet_private *rnet = netdev_priv(ndev);
416
417 rnet->msg_enable = value;
418 }
419
420 static const struct ethtool_ops rionet_ethtool_ops = {
421 .get_drvinfo = rionet_get_drvinfo,
422 .get_msglevel = rionet_get_msglevel,
423 .set_msglevel = rionet_set_msglevel,
424 .get_link = ethtool_op_get_link,
425 };
426
427 static const struct net_device_ops rionet_netdev_ops = {
428 .ndo_open = rionet_open,
429 .ndo_stop = rionet_close,
430 .ndo_start_xmit = rionet_start_xmit,
431 .ndo_change_mtu = eth_change_mtu,
432 .ndo_validate_addr = eth_validate_addr,
433 .ndo_set_mac_address = eth_mac_addr,
434 };
435
436 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
437 {
438 int rc = 0;
439 struct rionet_private *rnet;
440 u16 device_id;
441
442 rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
443 mport->sys_size ? __fls(sizeof(void *)) + 4 : 0);
444 if (!rionet_active) {
445 rc = -ENOMEM;
446 goto out;
447 }
448 memset((void *)rionet_active, 0, sizeof(void *) *
449 RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
450
451 /* Set up private area */
452 rnet = netdev_priv(ndev);
453 rnet->mport = mport;
454
455 /* Set the default MAC address */
456 device_id = rio_local_get_device_id(mport);
457 ndev->dev_addr[0] = 0x00;
458 ndev->dev_addr[1] = 0x01;
459 ndev->dev_addr[2] = 0x00;
460 ndev->dev_addr[3] = 0x01;
461 ndev->dev_addr[4] = device_id >> 8;
462 ndev->dev_addr[5] = device_id & 0xff;
463
464 ndev->netdev_ops = &rionet_netdev_ops;
465 ndev->mtu = RIO_MAX_MSG_SIZE - 14;
466 ndev->features = NETIF_F_LLTX;
467 SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
468
469 spin_lock_init(&rnet->lock);
470 spin_lock_init(&rnet->tx_lock);
471
472 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
473
474 rc = register_netdev(ndev);
475 if (rc != 0)
476 goto out;
477
478 printk("%s: %s %s Version %s, MAC %pM\n",
479 ndev->name,
480 DRV_NAME,
481 DRV_DESC,
482 DRV_VERSION,
483 ndev->dev_addr);
484
485 out:
486 return rc;
487 }
488
489 /*
490 * XXX Make multi-net safe
491 */
492 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
493 {
494 int rc = -ENODEV;
495 u32 lpef, lsrc_ops, ldst_ops;
496 struct rionet_peer *peer;
497 struct net_device *ndev = NULL;
498
499 /* If local device is not rionet capable, give up quickly */
500 if (!rionet_capable)
501 goto out;
502
503 /* Allocate our net_device structure */
504 ndev = alloc_etherdev(sizeof(struct rionet_private));
505 if (ndev == NULL) {
506 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
507 DRV_NAME);
508 rc = -ENOMEM;
509 goto out;
510 }
511
512 /*
513 * First time through, make sure local device is rionet
514 * capable, setup netdev, and set flags so this is skipped
515 * on later probes
516 */
517 if (!rionet_check) {
518 rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
519 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
520 &lsrc_ops);
521 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
522 &ldst_ops);
523 if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
524 printk(KERN_ERR
525 "%s: local device is not network capable\n",
526 DRV_NAME);
527 rionet_check = 1;
528 rionet_capable = 0;
529 goto out;
530 }
531
532 rc = rionet_setup_netdev(rdev->net->hport, ndev);
533 rionet_check = 1;
534 }
535
536 /*
537 * If the remote device has mailbox/doorbell capabilities,
538 * add it to the peer list.
539 */
540 if (dev_rionet_capable(rdev)) {
541 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
542 rc = -ENOMEM;
543 goto out;
544 }
545 peer->rdev = rdev;
546 list_add_tail(&peer->node, &rionet_peers);
547 }
548
549 rio_set_drvdata(rdev, ndev);
550
551 out:
552 return rc;
553 }
554
555 static struct rio_device_id rionet_id_table[] = {
556 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
557 };
558
559 static struct rio_driver rionet_driver = {
560 .name = "rionet",
561 .id_table = rionet_id_table,
562 .probe = rionet_probe,
563 .remove = rionet_remove,
564 };
565
566 static int __init rionet_init(void)
567 {
568 return rio_register_driver(&rionet_driver);
569 }
570
571 static void __exit rionet_exit(void)
572 {
573 rio_unregister_driver(&rionet_driver);
574 }
575
576 late_initcall(rionet_init);
577 module_exit(rionet_exit);
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