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net: alx: Work around the DMA RX overflow issue
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / rionet.c
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 }
212
213 spin_unlock_irqrestore(&rnet->tx_lock, flags);
214
215 return NETDEV_TX_OK;
216 }
217
218 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
219 u16 info)
220 {
221 struct net_device *ndev = dev_id;
222 struct rionet_private *rnet = netdev_priv(ndev);
223 struct rionet_peer *peer;
224
225 if (netif_msg_intr(rnet))
226 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
227 DRV_NAME, sid, tid, info);
228 if (info == RIONET_DOORBELL_JOIN) {
229 if (!nets[rnet->mport->id].active[sid]) {
230 list_for_each_entry(peer,
231 &nets[rnet->mport->id].peers, node) {
232 if (peer->rdev->destid == sid) {
233 nets[rnet->mport->id].active[sid] =
234 peer->rdev;
235 nets[rnet->mport->id].nact++;
236 }
237 }
238 rio_mport_send_doorbell(mport, sid,
239 RIONET_DOORBELL_JOIN);
240 }
241 } else if (info == RIONET_DOORBELL_LEAVE) {
242 nets[rnet->mport->id].active[sid] = NULL;
243 nets[rnet->mport->id].nact--;
244 } else {
245 if (netif_msg_intr(rnet))
246 printk(KERN_WARNING "%s: unhandled doorbell\n",
247 DRV_NAME);
248 }
249 }
250
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
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->tx_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->tx_lock);
292 }
293
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,
338 &nets[rnet->mport->id].peers, node) {
339 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
340 RIONET_DOORBELL_JOIN,
341 RIONET_DOORBELL_LEAVE)))
342 {
343 printk(KERN_ERR "%s: error requesting doorbells\n",
344 DRV_NAME);
345 continue;
346 }
347
348 /* Send a join message */
349 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
350 }
351
352 out:
353 return rc;
354 }
355
356 static int rionet_close(struct net_device *ndev)
357 {
358 struct rionet_private *rnet = netdev_priv(ndev);
359 struct rionet_peer *peer, *tmp;
360 int i;
361
362 if (netif_msg_ifup(rnet))
363 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
364
365 netif_stop_queue(ndev);
366 netif_carrier_off(ndev);
367
368 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
369 kfree_skb(rnet->rx_skb[i]);
370
371 list_for_each_entry_safe(peer, tmp,
372 &nets[rnet->mport->id].peers, node) {
373 if (nets[rnet->mport->id].active[peer->rdev->destid]) {
374 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
375 nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
376 }
377 rio_release_outb_dbell(peer->rdev, peer->res);
378 }
379
380 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
381 RIONET_DOORBELL_LEAVE);
382 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
383 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
384
385 return 0;
386 }
387
388 static void rionet_remove(struct rio_dev *rdev)
389 {
390 struct net_device *ndev = rio_get_drvdata(rdev);
391 unsigned char netid = rdev->net->hport->id;
392 struct rionet_peer *peer, *tmp;
393
394 unregister_netdev(ndev);
395
396 free_pages((unsigned long)nets[netid].active, get_order(sizeof(void *) *
397 RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size)));
398 nets[netid].active = NULL;
399
400 list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
401 list_del(&peer->node);
402 kfree(peer);
403 }
404
405 free_netdev(ndev);
406 }
407
408 static void rionet_get_drvinfo(struct net_device *ndev,
409 struct ethtool_drvinfo *info)
410 {
411 struct rionet_private *rnet = netdev_priv(ndev);
412
413 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
414 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
415 strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
416 strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
417 }
418
419 static u32 rionet_get_msglevel(struct net_device *ndev)
420 {
421 struct rionet_private *rnet = netdev_priv(ndev);
422
423 return rnet->msg_enable;
424 }
425
426 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
427 {
428 struct rionet_private *rnet = netdev_priv(ndev);
429
430 rnet->msg_enable = value;
431 }
432
433 static const struct ethtool_ops rionet_ethtool_ops = {
434 .get_drvinfo = rionet_get_drvinfo,
435 .get_msglevel = rionet_get_msglevel,
436 .set_msglevel = rionet_set_msglevel,
437 .get_link = ethtool_op_get_link,
438 };
439
440 static const struct net_device_ops rionet_netdev_ops = {
441 .ndo_open = rionet_open,
442 .ndo_stop = rionet_close,
443 .ndo_start_xmit = rionet_start_xmit,
444 .ndo_change_mtu = eth_change_mtu,
445 .ndo_validate_addr = eth_validate_addr,
446 .ndo_set_mac_address = eth_mac_addr,
447 };
448
449 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
450 {
451 int rc = 0;
452 struct rionet_private *rnet;
453 u16 device_id;
454 const size_t rionet_active_bytes = sizeof(void *) *
455 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
456
457 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
458 get_order(rionet_active_bytes));
459 if (!nets[mport->id].active) {
460 rc = -ENOMEM;
461 goto out;
462 }
463 memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
464
465 /* Set up private area */
466 rnet = netdev_priv(ndev);
467 rnet->mport = mport;
468
469 /* Set the default MAC address */
470 device_id = rio_local_get_device_id(mport);
471 ndev->dev_addr[0] = 0x00;
472 ndev->dev_addr[1] = 0x01;
473 ndev->dev_addr[2] = 0x00;
474 ndev->dev_addr[3] = 0x01;
475 ndev->dev_addr[4] = device_id >> 8;
476 ndev->dev_addr[5] = device_id & 0xff;
477
478 ndev->netdev_ops = &rionet_netdev_ops;
479 ndev->mtu = RIO_MAX_MSG_SIZE - 14;
480 ndev->features = NETIF_F_LLTX;
481 SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
482
483 spin_lock_init(&rnet->lock);
484 spin_lock_init(&rnet->tx_lock);
485
486 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
487
488 rc = register_netdev(ndev);
489 if (rc != 0)
490 goto out;
491
492 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
493 ndev->name,
494 DRV_NAME,
495 DRV_DESC,
496 DRV_VERSION,
497 ndev->dev_addr,
498 mport->name);
499
500 out:
501 return rc;
502 }
503
504 static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
505
506 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
507 {
508 int rc = -ENODEV;
509 u32 lsrc_ops, ldst_ops;
510 struct rionet_peer *peer;
511 struct net_device *ndev = NULL;
512 unsigned char netid = rdev->net->hport->id;
513 int oldnet;
514
515 if (netid >= RIONET_MAX_NETS)
516 return rc;
517
518 oldnet = test_and_set_bit(netid, net_table);
519
520 /*
521 * First time through, make sure local device is rionet
522 * capable, setup netdev (will be skipped on later probes)
523 */
524 if (!oldnet) {
525 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
526 &lsrc_ops);
527 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
528 &ldst_ops);
529 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
530 printk(KERN_ERR
531 "%s: local device %s is not network capable\n",
532 DRV_NAME, rdev->net->hport->name);
533 goto out;
534 }
535
536 /* Allocate our net_device structure */
537 ndev = alloc_etherdev(sizeof(struct rionet_private));
538 if (ndev == NULL) {
539 rc = -ENOMEM;
540 goto out;
541 }
542 nets[netid].ndev = ndev;
543 rc = rionet_setup_netdev(rdev->net->hport, ndev);
544 INIT_LIST_HEAD(&nets[netid].peers);
545 nets[netid].nact = 0;
546 } else if (nets[netid].ndev == NULL)
547 goto out;
548
549 /*
550 * If the remote device has mailbox/doorbell capabilities,
551 * add it to the peer list.
552 */
553 if (dev_rionet_capable(rdev)) {
554 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
555 rc = -ENOMEM;
556 goto out;
557 }
558 peer->rdev = rdev;
559 list_add_tail(&peer->node, &nets[netid].peers);
560 }
561
562 rio_set_drvdata(rdev, nets[netid].ndev);
563
564 out:
565 return rc;
566 }
567
568 static struct rio_device_id rionet_id_table[] = {
569 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
570 };
571
572 static struct rio_driver rionet_driver = {
573 .name = "rionet",
574 .id_table = rionet_id_table,
575 .probe = rionet_probe,
576 .remove = rionet_remove,
577 };
578
579 static int __init rionet_init(void)
580 {
581 return rio_register_driver(&rionet_driver);
582 }
583
584 static void __exit rionet_exit(void)
585 {
586 rio_unregister_driver(&rionet_driver);
587 }
588
589 late_initcall(rionet_init);
590 module_exit(rionet_exit);
kernel source for telekom puls (alcatel/mediatek)