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 static int nact; /* total number of active rionet peers */
83
84 #define is_rionet_capable(src_ops, dst_ops) \
85 ((src_ops & RIO_SRC_OPS_DATA_MSG) && \
86 (dst_ops & RIO_DST_OPS_DATA_MSG) && \
87 (src_ops & RIO_SRC_OPS_DOORBELL) && \
88 (dst_ops & RIO_DST_OPS_DOORBELL))
89 #define dev_rionet_capable(dev) \
90 is_rionet_capable(dev->src_ops, dev->dst_ops)
91
92 #define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
93 #define RIONET_GET_DESTID(x) ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
94
rionet_rx_clean(struct net_device * ndev)95 static int rionet_rx_clean(struct net_device *ndev)
96 {
97 int i;
98 int error = 0;
99 struct rionet_private *rnet = netdev_priv(ndev);
100 void *data;
101
102 i = rnet->rx_slot;
103
104 do {
105 if (!rnet->rx_skb[i])
106 continue;
107
108 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
109 break;
110
111 rnet->rx_skb[i]->data = data;
112 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
113 rnet->rx_skb[i]->protocol =
114 eth_type_trans(rnet->rx_skb[i], ndev);
115 error = netif_rx(rnet->rx_skb[i]);
116
117 if (error == NET_RX_DROP) {
118 ndev->stats.rx_dropped++;
119 } else {
120 ndev->stats.rx_packets++;
121 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
122 }
123
124 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
125
126 return i;
127 }
128
rionet_rx_fill(struct net_device * ndev,int end)129 static void rionet_rx_fill(struct net_device *ndev, int end)
130 {
131 int i;
132 struct rionet_private *rnet = netdev_priv(ndev);
133
134 i = rnet->rx_slot;
135 do {
136 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
137
138 if (!rnet->rx_skb[i])
139 break;
140
141 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
142 rnet->rx_skb[i]->data);
143 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
144
145 rnet->rx_slot = i;
146 }
147
rionet_queue_tx_msg(struct sk_buff * skb,struct net_device * ndev,struct rio_dev * rdev)148 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
149 struct rio_dev *rdev)
150 {
151 struct rionet_private *rnet = netdev_priv(ndev);
152
153 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
154 rnet->tx_skb[rnet->tx_slot] = skb;
155
156 ndev->stats.tx_packets++;
157 ndev->stats.tx_bytes += skb->len;
158
159 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
160 netif_stop_queue(ndev);
161
162 ++rnet->tx_slot;
163 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
164
165 if (netif_msg_tx_queued(rnet))
166 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
167 skb->len);
168
169 return 0;
170 }
171
rionet_start_xmit(struct sk_buff * skb,struct net_device * ndev)172 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
173 {
174 int i;
175 struct rionet_private *rnet = netdev_priv(ndev);
176 struct ethhdr *eth = (struct ethhdr *)skb->data;
177 u16 destid;
178 unsigned long flags;
179 int add_num = 1;
180
181 local_irq_save(flags);
182 if (!spin_trylock(&rnet->tx_lock)) {
183 local_irq_restore(flags);
184 return NETDEV_TX_LOCKED;
185 }
186
187 if (is_multicast_ether_addr(eth->h_dest))
188 add_num = nact;
189
190 if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
191 netif_stop_queue(ndev);
192 spin_unlock_irqrestore(&rnet->tx_lock, flags);
193 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
194 ndev->name);
195 return NETDEV_TX_BUSY;
196 }
197
198 if (is_multicast_ether_addr(eth->h_dest)) {
199 int count = 0;
200 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
201 i++)
202 if (rionet_active[i]) {
203 rionet_queue_tx_msg(skb, ndev,
204 rionet_active[i]);
205 if (count)
206 atomic_inc(&skb->users);
207 count++;
208 }
209 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
210 destid = RIONET_GET_DESTID(eth->h_dest);
211 if (rionet_active[destid])
212 rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
213 }
214
215 spin_unlock_irqrestore(&rnet->tx_lock, flags);
216
217 return NETDEV_TX_OK;
218 }
219
rionet_dbell_event(struct rio_mport * mport,void * dev_id,u16 sid,u16 tid,u16 info)220 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
221 u16 info)
222 {
223 struct net_device *ndev = dev_id;
224 struct rionet_private *rnet = netdev_priv(ndev);
225 struct rionet_peer *peer;
226
227 if (netif_msg_intr(rnet))
228 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
229 DRV_NAME, sid, tid, info);
230 if (info == RIONET_DOORBELL_JOIN) {
231 if (!rionet_active[sid]) {
232 list_for_each_entry(peer, &rionet_peers, node) {
233 if (peer->rdev->destid == sid) {
234 rionet_active[sid] = peer->rdev;
235 nact++;
236 }
237 }
238 rio_mport_send_doorbell(mport, sid,
239 RIONET_DOORBELL_JOIN);
240 }
241 } else if (info == RIONET_DOORBELL_LEAVE) {
242 rionet_active[sid] = NULL;
243 nact--;
244 } else {
245 if (netif_msg_intr(rnet))
246 printk(KERN_WARNING "%s: unhandled doorbell\n",
247 DRV_NAME);
248 }
249 }
250
rionet_inb_msg_event(struct rio_mport * mport,void * dev_id,int mbox,int slot)251 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
252 {
253 int n;
254 struct net_device *ndev = dev_id;
255 struct rionet_private *rnet = netdev_priv(ndev);
256
257 if (netif_msg_intr(rnet))
258 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
259 DRV_NAME, mbox, slot);
260
261 spin_lock(&rnet->lock);
262 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
263 rionet_rx_fill(ndev, n);
264 spin_unlock(&rnet->lock);
265 }
266
rionet_outb_msg_event(struct rio_mport * mport,void * dev_id,int mbox,int slot)267 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
268 {
269 struct net_device *ndev = dev_id;
270 struct rionet_private *rnet = netdev_priv(ndev);
271
272 spin_lock(&rnet->lock);
273
274 if (netif_msg_intr(rnet))
275 printk(KERN_INFO
276 "%s: outbound message event, mbox %d slot %d\n",
277 DRV_NAME, mbox, slot);
278
279 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
280 /* dma unmap single */
281 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
282 rnet->tx_skb[rnet->ack_slot] = NULL;
283 ++rnet->ack_slot;
284 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
285 rnet->tx_cnt--;
286 }
287
288 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
289 netif_wake_queue(ndev);
290
291 spin_unlock(&rnet->lock);
292 }
293
rionet_open(struct net_device * ndev)294 static int rionet_open(struct net_device *ndev)
295 {
296 int i, rc = 0;
297 struct rionet_peer *peer, *tmp;
298 struct rionet_private *rnet = netdev_priv(ndev);
299
300 if (netif_msg_ifup(rnet))
301 printk(KERN_INFO "%s: open\n", DRV_NAME);
302
303 if ((rc = rio_request_inb_dbell(rnet->mport,
304 (void *)ndev,
305 RIONET_DOORBELL_JOIN,
306 RIONET_DOORBELL_LEAVE,
307 rionet_dbell_event)) < 0)
308 goto out;
309
310 if ((rc = rio_request_inb_mbox(rnet->mport,
311 (void *)ndev,
312 RIONET_MAILBOX,
313 RIONET_RX_RING_SIZE,
314 rionet_inb_msg_event)) < 0)
315 goto out;
316
317 if ((rc = rio_request_outb_mbox(rnet->mport,
318 (void *)ndev,
319 RIONET_MAILBOX,
320 RIONET_TX_RING_SIZE,
321 rionet_outb_msg_event)) < 0)
322 goto out;
323
324 /* Initialize inbound message ring */
325 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
326 rnet->rx_skb[i] = NULL;
327 rnet->rx_slot = 0;
328 rionet_rx_fill(ndev, 0);
329
330 rnet->tx_slot = 0;
331 rnet->tx_cnt = 0;
332 rnet->ack_slot = 0;
333
334 netif_carrier_on(ndev);
335 netif_start_queue(ndev);
336
337 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
338 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
339 RIONET_DOORBELL_JOIN,
340 RIONET_DOORBELL_LEAVE)))
341 {
342 printk(KERN_ERR "%s: error requesting doorbells\n",
343 DRV_NAME);
344 continue;
345 }
346
347 /* Send a join message */
348 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
349 }
350
351 out:
352 return rc;
353 }
354
rionet_close(struct net_device * ndev)355 static int rionet_close(struct net_device *ndev)
356 {
357 struct rionet_private *rnet = netdev_priv(ndev);
358 struct rionet_peer *peer, *tmp;
359 int i;
360
361 if (netif_msg_ifup(rnet))
362 printk(KERN_INFO "%s: close\n", DRV_NAME);
363
364 netif_stop_queue(ndev);
365 netif_carrier_off(ndev);
366
367 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
368 kfree_skb(rnet->rx_skb[i]);
369
370 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
371 if (rionet_active[peer->rdev->destid]) {
372 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
373 rionet_active[peer->rdev->destid] = NULL;
374 }
375 rio_release_outb_dbell(peer->rdev, peer->res);
376 }
377
378 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
379 RIONET_DOORBELL_LEAVE);
380 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
381 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
382
383 return 0;
384 }
385
rionet_remove(struct rio_dev * rdev)386 static void rionet_remove(struct rio_dev *rdev)
387 {
388 struct net_device *ndev = rio_get_drvdata(rdev);
389 struct rionet_peer *peer, *tmp;
390
391 free_pages((unsigned long)rionet_active, get_order(sizeof(void *) *
392 RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size)));
393 unregister_netdev(ndev);
394 free_netdev(ndev);
395
396 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
397 list_del(&peer->node);
398 kfree(peer);
399 }
400 }
401
rionet_get_drvinfo(struct net_device * ndev,struct ethtool_drvinfo * info)402 static void rionet_get_drvinfo(struct net_device *ndev,
403 struct ethtool_drvinfo *info)
404 {
405 struct rionet_private *rnet = netdev_priv(ndev);
406
407 strcpy(info->driver, DRV_NAME);
408 strcpy(info->version, DRV_VERSION);
409 strcpy(info->fw_version, "n/a");
410 strcpy(info->bus_info, rnet->mport->name);
411 }
412
rionet_get_msglevel(struct net_device * ndev)413 static u32 rionet_get_msglevel(struct net_device *ndev)
414 {
415 struct rionet_private *rnet = netdev_priv(ndev);
416
417 return rnet->msg_enable;
418 }
419
rionet_set_msglevel(struct net_device * ndev,u32 value)420 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
421 {
422 struct rionet_private *rnet = netdev_priv(ndev);
423
424 rnet->msg_enable = value;
425 }
426
427 static const struct ethtool_ops rionet_ethtool_ops = {
428 .get_drvinfo = rionet_get_drvinfo,
429 .get_msglevel = rionet_get_msglevel,
430 .set_msglevel = rionet_set_msglevel,
431 .get_link = ethtool_op_get_link,
432 };
433
434 static const struct net_device_ops rionet_netdev_ops = {
435 .ndo_open = rionet_open,
436 .ndo_stop = rionet_close,
437 .ndo_start_xmit = rionet_start_xmit,
438 .ndo_change_mtu = eth_change_mtu,
439 .ndo_validate_addr = eth_validate_addr,
440 .ndo_set_mac_address = eth_mac_addr,
441 };
442
rionet_setup_netdev(struct rio_mport * mport,struct net_device * ndev)443 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
444 {
445 int rc = 0;
446 struct rionet_private *rnet;
447 u16 device_id;
448 const size_t rionet_active_bytes = sizeof(void *) *
449 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
450
451 rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
452 get_order(rionet_active_bytes));
453 if (!rionet_active) {
454 rc = -ENOMEM;
455 goto out;
456 }
457 memset((void *)rionet_active, 0, rionet_active_bytes);
458
459 /* Set up private area */
460 rnet = netdev_priv(ndev);
461 rnet->mport = mport;
462
463 /* Set the default MAC address */
464 device_id = rio_local_get_device_id(mport);
465 ndev->dev_addr[0] = 0x00;
466 ndev->dev_addr[1] = 0x01;
467 ndev->dev_addr[2] = 0x00;
468 ndev->dev_addr[3] = 0x01;
469 ndev->dev_addr[4] = device_id >> 8;
470 ndev->dev_addr[5] = device_id & 0xff;
471
472 ndev->netdev_ops = &rionet_netdev_ops;
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 */
rionet_probe(struct rio_dev * rdev,const struct rio_device_id * id)500 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
501 {
502 int rc = -ENODEV;
503 u32 lsrc_ops, ldst_ops;
504 struct rionet_peer *peer;
505 struct net_device *ndev = NULL;
506
507 /* If local device is not rionet capable, give up quickly */
508 if (!rionet_capable)
509 goto out;
510
511 /* Allocate our net_device structure */
512 ndev = alloc_etherdev(sizeof(struct rionet_private));
513 if (ndev == NULL) {
514 rc = -ENOMEM;
515 goto out;
516 }
517
518 /*
519 * First time through, make sure local device is rionet
520 * capable, setup netdev, and set flags so this is skipped
521 * on later probes
522 */
523 if (!rionet_check) {
524 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
525 &lsrc_ops);
526 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
527 &ldst_ops);
528 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
529 printk(KERN_ERR
530 "%s: local device is not network capable\n",
531 DRV_NAME);
532 rionet_check = 1;
533 rionet_capable = 0;
534 goto out;
535 }
536
537 rc = rionet_setup_netdev(rdev->net->hport, ndev);
538 rionet_check = 1;
539 nact = 0;
540 }
541
542 /*
543 * If the remote device has mailbox/doorbell capabilities,
544 * add it to the peer list.
545 */
546 if (dev_rionet_capable(rdev)) {
547 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
548 rc = -ENOMEM;
549 goto out;
550 }
551 peer->rdev = rdev;
552 list_add_tail(&peer->node, &rionet_peers);
553 }
554
555 rio_set_drvdata(rdev, ndev);
556
557 out:
558 return rc;
559 }
560
561 static struct rio_device_id rionet_id_table[] = {
562 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
563 };
564
565 static struct rio_driver rionet_driver = {
566 .name = "rionet",
567 .id_table = rionet_id_table,
568 .probe = rionet_probe,
569 .remove = rionet_remove,
570 };
571
rionet_init(void)572 static int __init rionet_init(void)
573 {
574 return rio_register_driver(&rionet_driver);
575 }
576
rionet_exit(void)577 static void __exit rionet_exit(void)
578 {
579 rio_unregister_driver(&rionet_driver);
580 }
581
582 late_initcall(rionet_init);
583 module_exit(rionet_exit);
584