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mpls_iptunnel: fix sparse warn: remove incorrect rcu_dereference
[linux/fpc-iii.git] / drivers / net / rionet.c
blobdac7a0d9bb46e5d9d2385250f990a2a0acf5996c
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 "0.3"
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 #define RIONET_MAX_NETS 8
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 struct rionet_net {
72 struct net_device *ndev;
73 struct list_head peers;
74 struct rio_dev **active;
75 int nact; /* number of active peers */
76 };
77
78 static struct rionet_net nets[RIONET_MAX_NETS];
79
80 #define is_rionet_capable(src_ops, dst_ops) \
81 ((src_ops & RIO_SRC_OPS_DATA_MSG) && \
82 (dst_ops & RIO_DST_OPS_DATA_MSG) && \
83 (src_ops & RIO_SRC_OPS_DOORBELL) && \
84 (dst_ops & RIO_DST_OPS_DOORBELL))
85 #define dev_rionet_capable(dev) \
86 is_rionet_capable(dev->src_ops, dev->dst_ops)
87
88 #define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
89 #define RIONET_GET_DESTID(x) ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
90
91 static int rionet_rx_clean(struct net_device *ndev)
92 {
93 int i;
94 int error = 0;
95 struct rionet_private *rnet = netdev_priv(ndev);
96 void *data;
97
98 i = rnet->rx_slot;
99
100 do {
101 if (!rnet->rx_skb[i])
102 continue;
103
104 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
105 break;
106
107 rnet->rx_skb[i]->data = data;
108 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
109 rnet->rx_skb[i]->protocol =
110 eth_type_trans(rnet->rx_skb[i], ndev);
111 error = netif_rx(rnet->rx_skb[i]);
112
113 if (error == NET_RX_DROP) {
114 ndev->stats.rx_dropped++;
115 } else {
116 ndev->stats.rx_packets++;
117 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
118 }
119
120 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
121
122 return i;
123 }
124
125 static void rionet_rx_fill(struct net_device *ndev, int end)
126 {
127 int i;
128 struct rionet_private *rnet = netdev_priv(ndev);
129
130 i = rnet->rx_slot;
131 do {
132 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
133
134 if (!rnet->rx_skb[i])
135 break;
136
137 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
138 rnet->rx_skb[i]->data);
139 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
140
141 rnet->rx_slot = i;
142 }
143
144 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
145 struct rio_dev *rdev)
146 {
147 struct rionet_private *rnet = netdev_priv(ndev);
148
149 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
150 rnet->tx_skb[rnet->tx_slot] = skb;
151
152 ndev->stats.tx_packets++;
153 ndev->stats.tx_bytes += skb->len;
154
155 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
156 netif_stop_queue(ndev);
157
158 ++rnet->tx_slot;
159 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
160
161 if (netif_msg_tx_queued(rnet))
162 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
163 skb->len);
164
165 return 0;
166 }
167
168 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
169 {
170 int i;
171 struct rionet_private *rnet = netdev_priv(ndev);
172 struct ethhdr *eth = (struct ethhdr *)skb->data;
173 u16 destid;
174 unsigned long flags;
175 int add_num = 1;
176
177 local_irq_save(flags);
178 if (!spin_trylock(&rnet->tx_lock)) {
179 local_irq_restore(flags);
180 return NETDEV_TX_LOCKED;
181 }
182
183 if (is_multicast_ether_addr(eth->h_dest))
184 add_num = nets[rnet->mport->id].nact;
185
186 if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
187 netif_stop_queue(ndev);
188 spin_unlock_irqrestore(&rnet->tx_lock, flags);
189 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
190 ndev->name);
191 return NETDEV_TX_BUSY;
192 }
193
194 if (is_multicast_ether_addr(eth->h_dest)) {
195 int count = 0;
196
197 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
198 i++)
199 if (nets[rnet->mport->id].active[i]) {
200 rionet_queue_tx_msg(skb, ndev,
201 nets[rnet->mport->id].active[i]);
202 if (count)
203 atomic_inc(&skb->users);
204 count++;
205 }
206 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
207 destid = RIONET_GET_DESTID(eth->h_dest);
208 if (nets[rnet->mport->id].active[destid])
209 rionet_queue_tx_msg(skb, ndev,
210 nets[rnet->mport->id].active[destid]);
211 else {
212 /*
213 * If the target device was removed from the list of
214 * active peers but we still have TX packets targeting
215 * it just report sending a packet to the target
216 * (without actual packet transfer).
217 */
218 dev_kfree_skb_any(skb);
219 ndev->stats.tx_packets++;
220 ndev->stats.tx_bytes += skb->len;
221 }
222 }
223
224 spin_unlock_irqrestore(&rnet->tx_lock, flags);
225
226 return NETDEV_TX_OK;
227 }
228
229 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
230 u16 info)
231 {
232 struct net_device *ndev = dev_id;
233 struct rionet_private *rnet = netdev_priv(ndev);
234 struct rionet_peer *peer;
235
236 if (netif_msg_intr(rnet))
237 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
238 DRV_NAME, sid, tid, info);
239 if (info == RIONET_DOORBELL_JOIN) {
240 if (!nets[rnet->mport->id].active[sid]) {
241 list_for_each_entry(peer,
242 &nets[rnet->mport->id].peers, node) {
243 if (peer->rdev->destid == sid) {
244 nets[rnet->mport->id].active[sid] =
245 peer->rdev;
246 nets[rnet->mport->id].nact++;
247 }
248 }
249 rio_mport_send_doorbell(mport, sid,
250 RIONET_DOORBELL_JOIN);
251 }
252 } else if (info == RIONET_DOORBELL_LEAVE) {
253 nets[rnet->mport->id].active[sid] = NULL;
254 nets[rnet->mport->id].nact--;
255 } else {
256 if (netif_msg_intr(rnet))
257 printk(KERN_WARNING "%s: unhandled doorbell\n",
258 DRV_NAME);
259 }
260 }
261
262 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
263 {
264 int n;
265 struct net_device *ndev = dev_id;
266 struct rionet_private *rnet = netdev_priv(ndev);
267
268 if (netif_msg_intr(rnet))
269 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
270 DRV_NAME, mbox, slot);
271
272 spin_lock(&rnet->lock);
273 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
274 rionet_rx_fill(ndev, n);
275 spin_unlock(&rnet->lock);
276 }
277
278 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
279 {
280 struct net_device *ndev = dev_id;
281 struct rionet_private *rnet = netdev_priv(ndev);
282
283 spin_lock(&rnet->lock);
284
285 if (netif_msg_intr(rnet))
286 printk(KERN_INFO
287 "%s: outbound message event, mbox %d slot %d\n",
288 DRV_NAME, mbox, slot);
289
290 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
291 /* dma unmap single */
292 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
293 rnet->tx_skb[rnet->ack_slot] = NULL;
294 ++rnet->ack_slot;
295 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
296 rnet->tx_cnt--;
297 }
298
299 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
300 netif_wake_queue(ndev);
301
302 spin_unlock(&rnet->lock);
303 }
304
305 static int rionet_open(struct net_device *ndev)
306 {
307 int i, rc = 0;
308 struct rionet_peer *peer, *tmp;
309 struct rionet_private *rnet = netdev_priv(ndev);
310
311 if (netif_msg_ifup(rnet))
312 printk(KERN_INFO "%s: open\n", DRV_NAME);
313
314 if ((rc = rio_request_inb_dbell(rnet->mport,
315 (void *)ndev,
316 RIONET_DOORBELL_JOIN,
317 RIONET_DOORBELL_LEAVE,
318 rionet_dbell_event)) < 0)
319 goto out;
320
321 if ((rc = rio_request_inb_mbox(rnet->mport,
322 (void *)ndev,
323 RIONET_MAILBOX,
324 RIONET_RX_RING_SIZE,
325 rionet_inb_msg_event)) < 0)
326 goto out;
327
328 if ((rc = rio_request_outb_mbox(rnet->mport,
329 (void *)ndev,
330 RIONET_MAILBOX,
331 RIONET_TX_RING_SIZE,
332 rionet_outb_msg_event)) < 0)
333 goto out;
334
335 /* Initialize inbound message ring */
336 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
337 rnet->rx_skb[i] = NULL;
338 rnet->rx_slot = 0;
339 rionet_rx_fill(ndev, 0);
340
341 rnet->tx_slot = 0;
342 rnet->tx_cnt = 0;
343 rnet->ack_slot = 0;
344
345 netif_carrier_on(ndev);
346 netif_start_queue(ndev);
347
348 list_for_each_entry_safe(peer, tmp,
349 &nets[rnet->mport->id].peers, node) {
350 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
351 RIONET_DOORBELL_JOIN,
352 RIONET_DOORBELL_LEAVE)))
353 {
354 printk(KERN_ERR "%s: error requesting doorbells\n",
355 DRV_NAME);
356 continue;
357 }
358
359 /* Send a join message */
360 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
361 }
362
363 out:
364 return rc;
365 }
366
367 static int rionet_close(struct net_device *ndev)
368 {
369 struct rionet_private *rnet = netdev_priv(ndev);
370 struct rionet_peer *peer, *tmp;
371 int i;
372
373 if (netif_msg_ifup(rnet))
374 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
375
376 netif_stop_queue(ndev);
377 netif_carrier_off(ndev);
378
379 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
380 kfree_skb(rnet->rx_skb[i]);
381
382 list_for_each_entry_safe(peer, tmp,
383 &nets[rnet->mport->id].peers, node) {
384 if (nets[rnet->mport->id].active[peer->rdev->destid]) {
385 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
386 nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
387 }
388 rio_release_outb_dbell(peer->rdev, peer->res);
389 }
390
391 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
392 RIONET_DOORBELL_LEAVE);
393 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
394 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
395
396 return 0;
397 }
398
399 static int rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
400 {
401 struct rio_dev *rdev = to_rio_dev(dev);
402 unsigned char netid = rdev->net->hport->id;
403 struct rionet_peer *peer, *tmp;
404
405 if (dev_rionet_capable(rdev)) {
406 list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
407 if (peer->rdev == rdev) {
408 if (nets[netid].active[rdev->destid]) {
409 nets[netid].active[rdev->destid] = NULL;
410 nets[netid].nact--;
411 }
412
413 list_del(&peer->node);
414 kfree(peer);
415 break;
416 }
417 }
418 }
419
420 return 0;
421 }
422
423 static void rionet_get_drvinfo(struct net_device *ndev,
424 struct ethtool_drvinfo *info)
425 {
426 struct rionet_private *rnet = netdev_priv(ndev);
427
428 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
429 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
430 strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
431 strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
432 }
433
434 static u32 rionet_get_msglevel(struct net_device *ndev)
435 {
436 struct rionet_private *rnet = netdev_priv(ndev);
437
438 return rnet->msg_enable;
439 }
440
441 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
442 {
443 struct rionet_private *rnet = netdev_priv(ndev);
444
445 rnet->msg_enable = value;
446 }
447
448 static const struct ethtool_ops rionet_ethtool_ops = {
449 .get_drvinfo = rionet_get_drvinfo,
450 .get_msglevel = rionet_get_msglevel,
451 .set_msglevel = rionet_set_msglevel,
452 .get_link = ethtool_op_get_link,
453 };
454
455 static const struct net_device_ops rionet_netdev_ops = {
456 .ndo_open = rionet_open,
457 .ndo_stop = rionet_close,
458 .ndo_start_xmit = rionet_start_xmit,
459 .ndo_change_mtu = eth_change_mtu,
460 .ndo_validate_addr = eth_validate_addr,
461 .ndo_set_mac_address = eth_mac_addr,
462 };
463
464 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
465 {
466 int rc = 0;
467 struct rionet_private *rnet;
468 u16 device_id;
469 const size_t rionet_active_bytes = sizeof(void *) *
470 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
471
472 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
473 get_order(rionet_active_bytes));
474 if (!nets[mport->id].active) {
475 rc = -ENOMEM;
476 goto out;
477 }
478 memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
479
480 /* Set up private area */
481 rnet = netdev_priv(ndev);
482 rnet->mport = mport;
483
484 /* Set the default MAC address */
485 device_id = rio_local_get_device_id(mport);
486 ndev->dev_addr[0] = 0x00;
487 ndev->dev_addr[1] = 0x01;
488 ndev->dev_addr[2] = 0x00;
489 ndev->dev_addr[3] = 0x01;
490 ndev->dev_addr[4] = device_id >> 8;
491 ndev->dev_addr[5] = device_id & 0xff;
492
493 ndev->netdev_ops = &rionet_netdev_ops;
494 ndev->mtu = RIO_MAX_MSG_SIZE - 14;
495 ndev->features = NETIF_F_LLTX;
496 SET_NETDEV_DEV(ndev, &mport->dev);
497 ndev->ethtool_ops = &rionet_ethtool_ops;
498
499 spin_lock_init(&rnet->lock);
500 spin_lock_init(&rnet->tx_lock);
501
502 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
503
504 rc = register_netdev(ndev);
505 if (rc != 0)
506 goto out;
507
508 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
509 ndev->name,
510 DRV_NAME,
511 DRV_DESC,
512 DRV_VERSION,
513 ndev->dev_addr,
514 mport->name);
515
516 out:
517 return rc;
518 }
519
520 static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
521
522 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
523 {
524 int rc = -ENODEV;
525 u32 lsrc_ops, ldst_ops;
526 struct rionet_peer *peer;
527 struct net_device *ndev = NULL;
528 struct rio_dev *rdev = to_rio_dev(dev);
529 unsigned char netid = rdev->net->hport->id;
530 int oldnet;
531
532 if (netid >= RIONET_MAX_NETS)
533 return rc;
534
535 oldnet = test_and_set_bit(netid, net_table);
536
537 /*
538 * If first time through this net, make sure local device is rionet
539 * capable and setup netdev (this step will be skipped in later probes
540 * on the same net).
541 */
542 if (!oldnet) {
543 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
544 &lsrc_ops);
545 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
546 &ldst_ops);
547 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
548 printk(KERN_ERR
549 "%s: local device %s is not network capable\n",
550 DRV_NAME, rdev->net->hport->name);
551 goto out;
552 }
553
554 /* Allocate our net_device structure */
555 ndev = alloc_etherdev(sizeof(struct rionet_private));
556 if (ndev == NULL) {
557 rc = -ENOMEM;
558 goto out;
559 }
560 nets[netid].ndev = ndev;
561 rc = rionet_setup_netdev(rdev->net->hport, ndev);
562 if (rc) {
563 printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
564 DRV_NAME, rc);
565 goto out;
566 }
567
568 INIT_LIST_HEAD(&nets[netid].peers);
569 nets[netid].nact = 0;
570 } else if (nets[netid].ndev == NULL)
571 goto out;
572
573 /*
574 * If the remote device has mailbox/doorbell capabilities,
575 * add it to the peer list.
576 */
577 if (dev_rionet_capable(rdev)) {
578 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
579 rc = -ENOMEM;
580 goto out;
581 }
582 peer->rdev = rdev;
583 list_add_tail(&peer->node, &nets[netid].peers);
584 }
585
586 return 0;
587 out:
588 return rc;
589 }
590
591 #ifdef MODULE
592 static struct rio_device_id rionet_id_table[] = {
593 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
594 { 0, } /* terminate list */
595 };
596
597 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
598 #endif
599
600 static struct subsys_interface rionet_interface = {
601 .name = "rionet",
602 .subsys = &rio_bus_type,
603 .add_dev = rionet_add_dev,
604 .remove_dev = rionet_remove_dev,
605 };
606
607 static int __init rionet_init(void)
608 {
609 return subsys_interface_register(&rionet_interface);
610 }
611
612 static void __exit rionet_exit(void)
613 {
614 struct rionet_private *rnet;
615 struct net_device *ndev;
616 struct rionet_peer *peer, *tmp;
617 int i;
618
619 for (i = 0; i < RIONET_MAX_NETS; i++) {
620 if (nets[i].ndev != NULL) {
621 ndev = nets[i].ndev;
622 rnet = netdev_priv(ndev);
623 unregister_netdev(ndev);
624
625 list_for_each_entry_safe(peer,
626 tmp, &nets[i].peers, node) {
627 list_del(&peer->node);
628 kfree(peer);
629 }
630
631 free_pages((unsigned long)nets[i].active,
632 get_order(sizeof(void *) *
633 RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size)));
634 nets[i].active = NULL;
635
636 free_netdev(ndev);
637 }
638 }
639
640 subsys_interface_unregister(&rionet_interface);
641 }
642
643 late_initcall(rionet_init);
644 module_exit(rionet_exit);
Linux with added FPC-III support