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[linux-rt-nao.git] / drivers / net / rionet.c
blob5eabde825451b12a3ebd9ccba94578c5050bf447
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 spin_lock_irqsave(&rnet->tx_lock, flags);
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 (eth->h_dest[0] & 0x01) {
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 0;
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 if (rnet->rx_skb[i])
362 kfree_skb(rnet->rx_skb[i]);
363
364 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
365 if (rionet_active[peer->rdev->destid]) {
366 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
367 rionet_active[peer->rdev->destid] = NULL;
368 }
369 rio_release_outb_dbell(peer->rdev, peer->res);
370 }
371
372 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
373 RIONET_DOORBELL_LEAVE);
374 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
375 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
376
377 return 0;
378 }
379
380 static void rionet_remove(struct rio_dev *rdev)
381 {
382 struct net_device *ndev = NULL;
383 struct rionet_peer *peer, *tmp;
384
385 free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
386 __ilog2(sizeof(void *)) + 4 : 0);
387 unregister_netdev(ndev);
388 kfree(ndev);
389
390 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
391 list_del(&peer->node);
392 kfree(peer);
393 }
394 }
395
396 static void rionet_get_drvinfo(struct net_device *ndev,
397 struct ethtool_drvinfo *info)
398 {
399 struct rionet_private *rnet = netdev_priv(ndev);
400
401 strcpy(info->driver, DRV_NAME);
402 strcpy(info->version, DRV_VERSION);
403 strcpy(info->fw_version, "n/a");
404 strcpy(info->bus_info, rnet->mport->name);
405 }
406
407 static u32 rionet_get_msglevel(struct net_device *ndev)
408 {
409 struct rionet_private *rnet = netdev_priv(ndev);
410
411 return rnet->msg_enable;
412 }
413
414 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
415 {
416 struct rionet_private *rnet = netdev_priv(ndev);
417
418 rnet->msg_enable = value;
419 }
420
421 static const struct ethtool_ops rionet_ethtool_ops = {
422 .get_drvinfo = rionet_get_drvinfo,
423 .get_msglevel = rionet_get_msglevel,
424 .set_msglevel = rionet_set_msglevel,
425 .get_link = ethtool_op_get_link,
426 };
427
428 static int rionet_setup_netdev(struct rio_mport *mport)
429 {
430 int rc = 0;
431 struct net_device *ndev = NULL;
432 struct rionet_private *rnet;
433 u16 device_id;
434
435 /* Allocate our net_device structure */
436 ndev = alloc_etherdev(sizeof(struct rionet_private));
437 if (ndev == NULL) {
438 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
439 DRV_NAME);
440 rc = -ENOMEM;
441 goto out;
442 }
443
444 rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
445 mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
446 if (!rionet_active) {
447 rc = -ENOMEM;
448 goto out;
449 }
450 memset((void *)rionet_active, 0, sizeof(void *) *
451 RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
452
453 /* Set up private area */
454 rnet = netdev_priv(ndev);
455 rnet->mport = mport;
456
457 /* Set the default MAC address */
458 device_id = rio_local_get_device_id(mport);
459 ndev->dev_addr[0] = 0x00;
460 ndev->dev_addr[1] = 0x01;
461 ndev->dev_addr[2] = 0x00;
462 ndev->dev_addr[3] = 0x01;
463 ndev->dev_addr[4] = device_id >> 8;
464 ndev->dev_addr[5] = device_id & 0xff;
465
466 /* Fill in the driver function table */
467 ndev->open = &rionet_open;
468 ndev->hard_start_xmit = &rionet_start_xmit;
469 ndev->stop = &rionet_close;
470 ndev->mtu = RIO_MAX_MSG_SIZE - 14;
471 ndev->features = NETIF_F_LLTX;
472 SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
473
474 spin_lock_init(&rnet->lock);
475 spin_lock_init(&rnet->tx_lock);
476
477 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
478
479 rc = register_netdev(ndev);
480 if (rc != 0)
481 goto out;
482
483 printk("%s: %s %s Version %s, MAC %pM\n",
484 ndev->name,
485 DRV_NAME,
486 DRV_DESC,
487 DRV_VERSION,
488 ndev->dev_addr);
489
490 out:
491 return rc;
492 }
493
494 /*
495 * XXX Make multi-net safe
496 */
497 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
498 {
499 int rc = -ENODEV;
500 u32 lpef, lsrc_ops, ldst_ops;
501 struct rionet_peer *peer;
502
503 /* If local device is not rionet capable, give up quickly */
504 if (!rionet_capable)
505 goto out;
506
507 /*
508 * First time through, make sure local device is rionet
509 * capable, setup netdev, and set flags so this is skipped
510 * on later probes
511 */
512 if (!rionet_check) {
513 rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
514 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
515 &lsrc_ops);
516 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
517 &ldst_ops);
518 if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
519 printk(KERN_ERR
520 "%s: local device is not network capable\n",
521 DRV_NAME);
522 rionet_check = 1;
523 rionet_capable = 0;
524 goto out;
525 }
526
527 rc = rionet_setup_netdev(rdev->net->hport);
528 rionet_check = 1;
529 }
530
531 /*
532 * If the remote device has mailbox/doorbell capabilities,
533 * add it to the peer list.
534 */
535 if (dev_rionet_capable(rdev)) {
536 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
537 rc = -ENOMEM;
538 goto out;
539 }
540 peer->rdev = rdev;
541 list_add_tail(&peer->node, &rionet_peers);
542 }
543
544 out:
545 return rc;
546 }
547
548 static struct rio_device_id rionet_id_table[] = {
549 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
550 };
551
552 static struct rio_driver rionet_driver = {
553 .name = "rionet",
554 .id_table = rionet_id_table,
555 .probe = rionet_probe,
556 .remove = rionet_remove,
557 };
558
559 static int __init rionet_init(void)
560 {
561 return rio_register_driver(&rionet_driver);
562 }
563
564 static void __exit rionet_exit(void)
565 {
566 rio_unregister_driver(&rionet_driver);
567 }
568
569 module_init(rionet_init);
570 module_exit(rionet_exit);
(Inofficial) Linux kernel tree running on the Nao robot