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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#include <linux/reboot.h>
28
29#define DRV_NAME "rionet"
30#define DRV_VERSION "0.3"
31#define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
32#define DRV_DESC "Ethernet over RapidIO"
33
34MODULE_AUTHOR(DRV_AUTHOR);
35MODULE_DESCRIPTION(DRV_DESC);
36MODULE_LICENSE("GPL");
37
38#define RIONET_DEFAULT_MSGLEVEL \
39 (NETIF_MSG_DRV | \
40 NETIF_MSG_LINK | \
41 NETIF_MSG_RX_ERR | \
42 NETIF_MSG_TX_ERR)
43
44#define RIONET_DOORBELL_JOIN 0x1000
45#define RIONET_DOORBELL_LEAVE 0x1001
46
47#define RIONET_MAILBOX 0
48
49#define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
50#define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
51#define RIONET_MAX_NETS 8
52#define RIONET_MSG_SIZE RIO_MAX_MSG_SIZE
53#define RIONET_MAX_MTU (RIONET_MSG_SIZE - ETH_HLEN)
54
55struct rionet_private {
56 struct rio_mport *mport;
57 struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
58 struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
59 int rx_slot;
60 int tx_slot;
61 int tx_cnt;
62 int ack_slot;
63 spinlock_t lock;
64 spinlock_t tx_lock;
65 u32 msg_enable;
66 bool open;
67};
68
69struct rionet_peer {
70 struct list_head node;
71 struct rio_dev *rdev;
72 struct resource *res;
73};
74
75struct rionet_net {
76 struct net_device *ndev;
77 struct list_head peers;
78 spinlock_t lock; /* net info access lock */
79 struct rio_dev **active;
80 int nact; /* number of active peers */
81};
82
83static struct rionet_net nets[RIONET_MAX_NETS];
84
85#define is_rionet_capable(src_ops, dst_ops) \
86 ((src_ops & RIO_SRC_OPS_DATA_MSG) && \
87 (dst_ops & RIO_DST_OPS_DATA_MSG) && \
88 (src_ops & RIO_SRC_OPS_DOORBELL) && \
89 (dst_ops & RIO_DST_OPS_DOORBELL))
90#define dev_rionet_capable(dev) \
91 is_rionet_capable(dev->src_ops, dev->dst_ops)
92
93#define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
94#define RIONET_GET_DESTID(x) ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
95
96static int rionet_rx_clean(struct net_device *ndev)
97{
98 int i;
99 int error = 0;
100 struct rionet_private *rnet = netdev_priv(ndev);
101 void *data;
102
103 i = rnet->rx_slot;
104
105 do {
106 if (!rnet->rx_skb[i])
107 continue;
108
109 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
110 break;
111
112 rnet->rx_skb[i]->data = data;
113 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
114 rnet->rx_skb[i]->protocol =
115 eth_type_trans(rnet->rx_skb[i], ndev);
116 error = netif_rx(rnet->rx_skb[i]);
117
118 if (error == NET_RX_DROP) {
119 ndev->stats.rx_dropped++;
120 } else {
121 ndev->stats.rx_packets++;
122 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
123 }
124
125 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
126
127 return i;
128}
129
130static void rionet_rx_fill(struct net_device *ndev, int end)
131{
132 int i;
133 struct rionet_private *rnet = netdev_priv(ndev);
134
135 i = rnet->rx_slot;
136 do {
137 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
138
139 if (!rnet->rx_skb[i])
140 break;
141
142 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
143 rnet->rx_skb[i]->data);
144 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
145
146 rnet->rx_slot = i;
147}
148
149static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
150 struct rio_dev *rdev)
151{
152 struct rionet_private *rnet = netdev_priv(ndev);
153
154 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
155 rnet->tx_skb[rnet->tx_slot] = skb;
156
157 ndev->stats.tx_packets++;
158 ndev->stats.tx_bytes += skb->len;
159
160 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
161 netif_stop_queue(ndev);
162
163 ++rnet->tx_slot;
164 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
165
166 if (netif_msg_tx_queued(rnet))
167 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
168 skb->len);
169
170 return 0;
171}
172
173static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
174{
175 int i;
176 struct rionet_private *rnet = netdev_priv(ndev);
177 struct ethhdr *eth = (struct ethhdr *)skb->data;
178 u16 destid;
179 unsigned long flags;
180 int add_num = 1;
181
182 spin_lock_irqsave(&rnet->tx_lock, flags);
183
184 if (is_multicast_ether_addr(eth->h_dest))
185 add_num = nets[rnet->mport->id].nact;
186
187 if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
188 netif_stop_queue(ndev);
189 spin_unlock_irqrestore(&rnet->tx_lock, flags);
190 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
191 ndev->name);
192 return NETDEV_TX_BUSY;
193 }
194
195 if (is_multicast_ether_addr(eth->h_dest)) {
196 int count = 0;
197
198 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
199 i++)
200 if (nets[rnet->mport->id].active[i]) {
201 rionet_queue_tx_msg(skb, ndev,
202 nets[rnet->mport->id].active[i]);
203 if (count)
204 refcount_inc(&skb->users);
205 count++;
206 }
207 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
208 destid = RIONET_GET_DESTID(eth->h_dest);
209 if (nets[rnet->mport->id].active[destid])
210 rionet_queue_tx_msg(skb, ndev,
211 nets[rnet->mport->id].active[destid]);
212 else {
213 /*
214 * If the target device was removed from the list of
215 * active peers but we still have TX packets targeting
216 * it just report sending a packet to the target
217 * (without actual packet transfer).
218 */
219 dev_kfree_skb_any(skb);
220 ndev->stats.tx_packets++;
221 ndev->stats.tx_bytes += skb->len;
222 }
223 }
224
225 spin_unlock_irqrestore(&rnet->tx_lock, flags);
226
227 return NETDEV_TX_OK;
228}
229
230static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
231 u16 info)
232{
233 struct net_device *ndev = dev_id;
234 struct rionet_private *rnet = netdev_priv(ndev);
235 struct rionet_peer *peer;
236 unsigned char netid = rnet->mport->id;
237
238 if (netif_msg_intr(rnet))
239 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
240 DRV_NAME, sid, tid, info);
241 if (info == RIONET_DOORBELL_JOIN) {
242 if (!nets[netid].active[sid]) {
243 spin_lock(&nets[netid].lock);
244 list_for_each_entry(peer, &nets[netid].peers, node) {
245 if (peer->rdev->destid == sid) {
246 nets[netid].active[sid] = peer->rdev;
247 nets[netid].nact++;
248 }
249 }
250 spin_unlock(&nets[netid].lock);
251
252 rio_mport_send_doorbell(mport, sid,
253 RIONET_DOORBELL_JOIN);
254 }
255 } else if (info == RIONET_DOORBELL_LEAVE) {
256 spin_lock(&nets[netid].lock);
257 if (nets[netid].active[sid]) {
258 nets[netid].active[sid] = NULL;
259 nets[netid].nact--;
260 }
261 spin_unlock(&nets[netid].lock);
262 } else {
263 if (netif_msg_intr(rnet))
264 printk(KERN_WARNING "%s: unhandled doorbell\n",
265 DRV_NAME);
266 }
267}
268
269static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
270{
271 int n;
272 struct net_device *ndev = dev_id;
273 struct rionet_private *rnet = netdev_priv(ndev);
274
275 if (netif_msg_intr(rnet))
276 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
277 DRV_NAME, mbox, slot);
278
279 spin_lock(&rnet->lock);
280 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
281 rionet_rx_fill(ndev, n);
282 spin_unlock(&rnet->lock);
283}
284
285static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
286{
287 struct net_device *ndev = dev_id;
288 struct rionet_private *rnet = netdev_priv(ndev);
289
290 spin_lock(&rnet->tx_lock);
291
292 if (netif_msg_intr(rnet))
293 printk(KERN_INFO
294 "%s: outbound message event, mbox %d slot %d\n",
295 DRV_NAME, mbox, slot);
296
297 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
298 /* dma unmap single */
299 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
300 rnet->tx_skb[rnet->ack_slot] = NULL;
301 ++rnet->ack_slot;
302 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
303 rnet->tx_cnt--;
304 }
305
306 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
307 netif_wake_queue(ndev);
308
309 spin_unlock(&rnet->tx_lock);
310}
311
312static int rionet_open(struct net_device *ndev)
313{
314 int i, rc = 0;
315 struct rionet_peer *peer;
316 struct rionet_private *rnet = netdev_priv(ndev);
317 unsigned char netid = rnet->mport->id;
318 unsigned long flags;
319
320 if (netif_msg_ifup(rnet))
321 printk(KERN_INFO "%s: open\n", DRV_NAME);
322
323 if ((rc = rio_request_inb_dbell(rnet->mport,
324 (void *)ndev,
325 RIONET_DOORBELL_JOIN,
326 RIONET_DOORBELL_LEAVE,
327 rionet_dbell_event)) < 0)
328 goto out;
329
330 if ((rc = rio_request_inb_mbox(rnet->mport,
331 (void *)ndev,
332 RIONET_MAILBOX,
333 RIONET_RX_RING_SIZE,
334 rionet_inb_msg_event)) < 0)
335 goto out;
336
337 if ((rc = rio_request_outb_mbox(rnet->mport,
338 (void *)ndev,
339 RIONET_MAILBOX,
340 RIONET_TX_RING_SIZE,
341 rionet_outb_msg_event)) < 0)
342 goto out;
343
344 /* Initialize inbound message ring */
345 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
346 rnet->rx_skb[i] = NULL;
347 rnet->rx_slot = 0;
348 rionet_rx_fill(ndev, 0);
349
350 rnet->tx_slot = 0;
351 rnet->tx_cnt = 0;
352 rnet->ack_slot = 0;
353
354 netif_carrier_on(ndev);
355 netif_start_queue(ndev);
356
357 spin_lock_irqsave(&nets[netid].lock, flags);
358 list_for_each_entry(peer, &nets[netid].peers, node) {
359 /* Send a join message */
360 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
361 }
362 spin_unlock_irqrestore(&nets[netid].lock, flags);
363 rnet->open = true;
364
365 out:
366 return rc;
367}
368
369static int rionet_close(struct net_device *ndev)
370{
371 struct rionet_private *rnet = netdev_priv(ndev);
372 struct rionet_peer *peer;
373 unsigned char netid = rnet->mport->id;
374 unsigned long flags;
375 int i;
376
377 if (netif_msg_ifup(rnet))
378 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
379
380 netif_stop_queue(ndev);
381 netif_carrier_off(ndev);
382 rnet->open = false;
383
384 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
385 kfree_skb(rnet->rx_skb[i]);
386
387 spin_lock_irqsave(&nets[netid].lock, flags);
388 list_for_each_entry(peer, &nets[netid].peers, node) {
389 if (nets[netid].active[peer->rdev->destid]) {
390 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
391 nets[netid].active[peer->rdev->destid] = NULL;
392 }
393 if (peer->res)
394 rio_release_outb_dbell(peer->rdev, peer->res);
395 }
396 spin_unlock_irqrestore(&nets[netid].lock, flags);
397
398 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
399 RIONET_DOORBELL_LEAVE);
400 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
401 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
402
403 return 0;
404}
405
406static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
407{
408 struct rio_dev *rdev = to_rio_dev(dev);
409 unsigned char netid = rdev->net->hport->id;
410 struct rionet_peer *peer;
411 int state, found = 0;
412 unsigned long flags;
413
414 if (!dev_rionet_capable(rdev))
415 return;
416
417 spin_lock_irqsave(&nets[netid].lock, flags);
418 list_for_each_entry(peer, &nets[netid].peers, node) {
419 if (peer->rdev == rdev) {
420 list_del(&peer->node);
421 if (nets[netid].active[rdev->destid]) {
422 state = atomic_read(&rdev->state);
423 if (state != RIO_DEVICE_GONE &&
424 state != RIO_DEVICE_INITIALIZING) {
425 rio_send_doorbell(rdev,
426 RIONET_DOORBELL_LEAVE);
427 }
428 nets[netid].active[rdev->destid] = NULL;
429 nets[netid].nact--;
430 }
431 found = 1;
432 break;
433 }
434 }
435 spin_unlock_irqrestore(&nets[netid].lock, flags);
436
437 if (found) {
438 if (peer->res)
439 rio_release_outb_dbell(rdev, peer->res);
440 kfree(peer);
441 }
442}
443
444static void rionet_get_drvinfo(struct net_device *ndev,
445 struct ethtool_drvinfo *info)
446{
447 struct rionet_private *rnet = netdev_priv(ndev);
448
449 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
450 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
451 strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
452 strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
453}
454
455static u32 rionet_get_msglevel(struct net_device *ndev)
456{
457 struct rionet_private *rnet = netdev_priv(ndev);
458
459 return rnet->msg_enable;
460}
461
462static void rionet_set_msglevel(struct net_device *ndev, u32 value)
463{
464 struct rionet_private *rnet = netdev_priv(ndev);
465
466 rnet->msg_enable = value;
467}
468
469static const struct ethtool_ops rionet_ethtool_ops = {
470 .get_drvinfo = rionet_get_drvinfo,
471 .get_msglevel = rionet_get_msglevel,
472 .set_msglevel = rionet_set_msglevel,
473 .get_link = ethtool_op_get_link,
474};
475
476static const struct net_device_ops rionet_netdev_ops = {
477 .ndo_open = rionet_open,
478 .ndo_stop = rionet_close,
479 .ndo_start_xmit = rionet_start_xmit,
480 .ndo_validate_addr = eth_validate_addr,
481 .ndo_set_mac_address = eth_mac_addr,
482};
483
484static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
485{
486 int rc = 0;
487 struct rionet_private *rnet;
488 u16 device_id;
489 const size_t rionet_active_bytes = sizeof(void *) *
490 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
491
492 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
493 get_order(rionet_active_bytes));
494 if (!nets[mport->id].active) {
495 rc = -ENOMEM;
496 goto out;
497 }
498 memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
499
500 /* Set up private area */
501 rnet = netdev_priv(ndev);
502 rnet->mport = mport;
503 rnet->open = false;
504
505 /* Set the default MAC address */
506 device_id = rio_local_get_device_id(mport);
507 ndev->dev_addr[0] = 0x00;
508 ndev->dev_addr[1] = 0x01;
509 ndev->dev_addr[2] = 0x00;
510 ndev->dev_addr[3] = 0x01;
511 ndev->dev_addr[4] = device_id >> 8;
512 ndev->dev_addr[5] = device_id & 0xff;
513
514 ndev->netdev_ops = &rionet_netdev_ops;
515 ndev->mtu = RIONET_MAX_MTU;
516 /* MTU range: 68 - 4082 */
517 ndev->min_mtu = ETH_MIN_MTU;
518 ndev->max_mtu = RIONET_MAX_MTU;
519 ndev->features = NETIF_F_LLTX;
520 SET_NETDEV_DEV(ndev, &mport->dev);
521 ndev->ethtool_ops = &rionet_ethtool_ops;
522
523 spin_lock_init(&rnet->lock);
524 spin_lock_init(&rnet->tx_lock);
525
526 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
527
528 rc = register_netdev(ndev);
529 if (rc != 0) {
530 free_pages((unsigned long)nets[mport->id].active,
531 get_order(rionet_active_bytes));
532 goto out;
533 }
534
535 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
536 ndev->name,
537 DRV_NAME,
538 DRV_DESC,
539 DRV_VERSION,
540 ndev->dev_addr,
541 mport->name);
542
543 out:
544 return rc;
545}
546
547static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
548{
549 int rc = -ENODEV;
550 u32 lsrc_ops, ldst_ops;
551 struct rionet_peer *peer;
552 struct net_device *ndev = NULL;
553 struct rio_dev *rdev = to_rio_dev(dev);
554 unsigned char netid = rdev->net->hport->id;
555
556 if (netid >= RIONET_MAX_NETS)
557 return rc;
558
559 /*
560 * If first time through this net, make sure local device is rionet
561 * capable and setup netdev (this step will be skipped in later probes
562 * on the same net).
563 */
564 if (!nets[netid].ndev) {
565 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
566 &lsrc_ops);
567 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
568 &ldst_ops);
569 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
570 printk(KERN_ERR
571 "%s: local device %s is not network capable\n",
572 DRV_NAME, rdev->net->hport->name);
573 goto out;
574 }
575
576 /* Allocate our net_device structure */
577 ndev = alloc_etherdev(sizeof(struct rionet_private));
578 if (ndev == NULL) {
579 rc = -ENOMEM;
580 goto out;
581 }
582
583 rc = rionet_setup_netdev(rdev->net->hport, ndev);
584 if (rc) {
585 printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
586 DRV_NAME, rc);
587 free_netdev(ndev);
588 goto out;
589 }
590
591 INIT_LIST_HEAD(&nets[netid].peers);
592 spin_lock_init(&nets[netid].lock);
593 nets[netid].nact = 0;
594 nets[netid].ndev = ndev;
595 }
596
597 /*
598 * If the remote device has mailbox/doorbell capabilities,
599 * add it to the peer list.
600 */
601 if (dev_rionet_capable(rdev)) {
602 struct rionet_private *rnet;
603 unsigned long flags;
604
605 rnet = netdev_priv(nets[netid].ndev);
606
607 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
608 if (!peer) {
609 rc = -ENOMEM;
610 goto out;
611 }
612 peer->rdev = rdev;
613 peer->res = rio_request_outb_dbell(peer->rdev,
614 RIONET_DOORBELL_JOIN,
615 RIONET_DOORBELL_LEAVE);
616 if (!peer->res) {
617 pr_err("%s: error requesting doorbells\n", DRV_NAME);
618 kfree(peer);
619 rc = -ENOMEM;
620 goto out;
621 }
622
623 spin_lock_irqsave(&nets[netid].lock, flags);
624 list_add_tail(&peer->node, &nets[netid].peers);
625 spin_unlock_irqrestore(&nets[netid].lock, flags);
626 pr_debug("%s: %s add peer %s\n",
627 DRV_NAME, __func__, rio_name(rdev));
628
629 /* If netdev is already opened, send join request to new peer */
630 if (rnet->open)
631 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
632 }
633
634 return 0;
635out:
636 return rc;
637}
638
639static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
640 void *unused)
641{
642 struct rionet_peer *peer;
643 unsigned long flags;
644 int i;
645
646 pr_debug("%s: %s\n", DRV_NAME, __func__);
647
648 for (i = 0; i < RIONET_MAX_NETS; i++) {
649 if (!nets[i].ndev)
650 continue;
651
652 spin_lock_irqsave(&nets[i].lock, flags);
653 list_for_each_entry(peer, &nets[i].peers, node) {
654 if (nets[i].active[peer->rdev->destid]) {
655 rio_send_doorbell(peer->rdev,
656 RIONET_DOORBELL_LEAVE);
657 nets[i].active[peer->rdev->destid] = NULL;
658 }
659 }
660 spin_unlock_irqrestore(&nets[i].lock, flags);
661 }
662
663 return NOTIFY_DONE;
664}
665
666static void rionet_remove_mport(struct device *dev,
667 struct class_interface *class_intf)
668{
669 struct rio_mport *mport = to_rio_mport(dev);
670 struct net_device *ndev;
671 int id = mport->id;
672
673 pr_debug("%s %s\n", __func__, mport->name);
674
675 WARN(nets[id].nact, "%s called when connected to %d peers\n",
676 __func__, nets[id].nact);
677 WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
678 __func__);
679
680 if (nets[id].ndev) {
681 ndev = nets[id].ndev;
682 netif_stop_queue(ndev);
683 unregister_netdev(ndev);
684
685 free_pages((unsigned long)nets[id].active,
686 get_order(sizeof(void *) *
687 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
688 nets[id].active = NULL;
689 free_netdev(ndev);
690 nets[id].ndev = NULL;
691 }
692}
693
694#ifdef MODULE
695static struct rio_device_id rionet_id_table[] = {
696 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
697 { 0, } /* terminate list */
698};
699
700MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
701#endif
702
703static struct subsys_interface rionet_interface = {
704 .name = "rionet",
705 .subsys = &rio_bus_type,
706 .add_dev = rionet_add_dev,
707 .remove_dev = rionet_remove_dev,
708};
709
710static struct notifier_block rionet_notifier = {
711 .notifier_call = rionet_shutdown,
712};
713
714/* the rio_mport_interface is used to handle local mport devices */
715static struct class_interface rio_mport_interface __refdata = {
716 .class = &rio_mport_class,
717 .add_dev = NULL,
718 .remove_dev = rionet_remove_mport,
719};
720
721static int __init rionet_init(void)
722{
723 int ret;
724
725 ret = register_reboot_notifier(&rionet_notifier);
726 if (ret) {
727 pr_err("%s: failed to register reboot notifier (err=%d)\n",
728 DRV_NAME, ret);
729 return ret;
730 }
731
732 ret = class_interface_register(&rio_mport_interface);
733 if (ret) {
734 pr_err("%s: class_interface_register error: %d\n",
735 DRV_NAME, ret);
736 return ret;
737 }
738
739 return subsys_interface_register(&rionet_interface);
740}
741
742static void __exit rionet_exit(void)
743{
744 unregister_reboot_notifier(&rionet_notifier);
745 subsys_interface_unregister(&rionet_interface);
746 class_interface_unregister(&rio_mport_interface);
747}
748
749late_initcall(rionet_init);
750module_exit(rionet_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * rionet - Ethernet driver over RapidIO messaging services
4 *
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/dma-mapping.h>
12#include <linux/delay.h>
13#include <linux/rio.h>
14#include <linux/rio_drv.h>
15#include <linux/slab.h>
16#include <linux/rio_ids.h>
17
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
20#include <linux/skbuff.h>
21#include <linux/crc32.h>
22#include <linux/ethtool.h>
23#include <linux/reboot.h>
24
25#define DRV_NAME "rionet"
26#define DRV_VERSION "0.3"
27#define DRV_AUTHOR "Matt Porter <mporter@kernel.crashing.org>"
28#define DRV_DESC "Ethernet over RapidIO"
29
30MODULE_AUTHOR(DRV_AUTHOR);
31MODULE_DESCRIPTION(DRV_DESC);
32MODULE_LICENSE("GPL");
33
34#define RIONET_DEFAULT_MSGLEVEL \
35 (NETIF_MSG_DRV | \
36 NETIF_MSG_LINK | \
37 NETIF_MSG_RX_ERR | \
38 NETIF_MSG_TX_ERR)
39
40#define RIONET_DOORBELL_JOIN 0x1000
41#define RIONET_DOORBELL_LEAVE 0x1001
42
43#define RIONET_MAILBOX 0
44
45#define RIONET_TX_RING_SIZE CONFIG_RIONET_TX_SIZE
46#define RIONET_RX_RING_SIZE CONFIG_RIONET_RX_SIZE
47#define RIONET_MAX_NETS 8
48#define RIONET_MSG_SIZE RIO_MAX_MSG_SIZE
49#define RIONET_MAX_MTU (RIONET_MSG_SIZE - ETH_HLEN)
50
51struct rionet_private {
52 struct rio_mport *mport;
53 struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
54 struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
55 int rx_slot;
56 int tx_slot;
57 int tx_cnt;
58 int ack_slot;
59 spinlock_t lock;
60 spinlock_t tx_lock;
61 u32 msg_enable;
62 bool open;
63};
64
65struct rionet_peer {
66 struct list_head node;
67 struct rio_dev *rdev;
68 struct resource *res;
69};
70
71struct rionet_net {
72 struct net_device *ndev;
73 struct list_head peers;
74 spinlock_t lock; /* net info access lock */
75 struct rio_dev **active;
76 int nact; /* number of active peers */
77};
78
79static struct rionet_net nets[RIONET_MAX_NETS];
80
81#define is_rionet_capable(src_ops, dst_ops) \
82 ((src_ops & RIO_SRC_OPS_DATA_MSG) && \
83 (dst_ops & RIO_DST_OPS_DATA_MSG) && \
84 (src_ops & RIO_SRC_OPS_DOORBELL) && \
85 (dst_ops & RIO_DST_OPS_DOORBELL))
86#define dev_rionet_capable(dev) \
87 is_rionet_capable(dev->src_ops, dev->dst_ops)
88
89#define RIONET_MAC_MATCH(x) (!memcmp((x), "\00\01\00\01", 4))
90#define RIONET_GET_DESTID(x) ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
91
92static int rionet_rx_clean(struct net_device *ndev)
93{
94 int i;
95 int error = 0;
96 struct rionet_private *rnet = netdev_priv(ndev);
97 void *data;
98
99 i = rnet->rx_slot;
100
101 do {
102 if (!rnet->rx_skb[i])
103 continue;
104
105 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
106 break;
107
108 rnet->rx_skb[i]->data = data;
109 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
110 rnet->rx_skb[i]->protocol =
111 eth_type_trans(rnet->rx_skb[i], ndev);
112 error = netif_rx(rnet->rx_skb[i]);
113
114 if (error == NET_RX_DROP) {
115 ndev->stats.rx_dropped++;
116 } else {
117 ndev->stats.rx_packets++;
118 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
119 }
120
121 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
122
123 return i;
124}
125
126static void rionet_rx_fill(struct net_device *ndev, int end)
127{
128 int i;
129 struct rionet_private *rnet = netdev_priv(ndev);
130
131 i = rnet->rx_slot;
132 do {
133 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
134
135 if (!rnet->rx_skb[i])
136 break;
137
138 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
139 rnet->rx_skb[i]->data);
140 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
141
142 rnet->rx_slot = i;
143}
144
145static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
146 struct rio_dev *rdev)
147{
148 struct rionet_private *rnet = netdev_priv(ndev);
149
150 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
151 rnet->tx_skb[rnet->tx_slot] = skb;
152
153 ndev->stats.tx_packets++;
154 ndev->stats.tx_bytes += skb->len;
155
156 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
157 netif_stop_queue(ndev);
158
159 ++rnet->tx_slot;
160 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
161
162 if (netif_msg_tx_queued(rnet))
163 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
164 skb->len);
165
166 return 0;
167}
168
169static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
170{
171 int i;
172 struct rionet_private *rnet = netdev_priv(ndev);
173 struct ethhdr *eth = (struct ethhdr *)skb->data;
174 u16 destid;
175 unsigned long flags;
176 int add_num = 1;
177
178 spin_lock_irqsave(&rnet->tx_lock, flags);
179
180 if (is_multicast_ether_addr(eth->h_dest))
181 add_num = nets[rnet->mport->id].nact;
182
183 if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
184 netif_stop_queue(ndev);
185 spin_unlock_irqrestore(&rnet->tx_lock, flags);
186 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
187 ndev->name);
188 return NETDEV_TX_BUSY;
189 }
190
191 if (is_multicast_ether_addr(eth->h_dest)) {
192 int count = 0;
193
194 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
195 i++)
196 if (nets[rnet->mport->id].active[i]) {
197 rionet_queue_tx_msg(skb, ndev,
198 nets[rnet->mport->id].active[i]);
199 if (count)
200 refcount_inc(&skb->users);
201 count++;
202 }
203 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
204 destid = RIONET_GET_DESTID(eth->h_dest);
205 if (nets[rnet->mport->id].active[destid])
206 rionet_queue_tx_msg(skb, ndev,
207 nets[rnet->mport->id].active[destid]);
208 else {
209 /*
210 * If the target device was removed from the list of
211 * active peers but we still have TX packets targeting
212 * it just report sending a packet to the target
213 * (without actual packet transfer).
214 */
215 ndev->stats.tx_packets++;
216 ndev->stats.tx_bytes += skb->len;
217 dev_kfree_skb_any(skb);
218 }
219 }
220
221 spin_unlock_irqrestore(&rnet->tx_lock, flags);
222
223 return NETDEV_TX_OK;
224}
225
226static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
227 u16 info)
228{
229 struct net_device *ndev = dev_id;
230 struct rionet_private *rnet = netdev_priv(ndev);
231 struct rionet_peer *peer;
232 unsigned char netid = rnet->mport->id;
233
234 if (netif_msg_intr(rnet))
235 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
236 DRV_NAME, sid, tid, info);
237 if (info == RIONET_DOORBELL_JOIN) {
238 if (!nets[netid].active[sid]) {
239 spin_lock(&nets[netid].lock);
240 list_for_each_entry(peer, &nets[netid].peers, node) {
241 if (peer->rdev->destid == sid) {
242 nets[netid].active[sid] = peer->rdev;
243 nets[netid].nact++;
244 }
245 }
246 spin_unlock(&nets[netid].lock);
247
248 rio_mport_send_doorbell(mport, sid,
249 RIONET_DOORBELL_JOIN);
250 }
251 } else if (info == RIONET_DOORBELL_LEAVE) {
252 spin_lock(&nets[netid].lock);
253 if (nets[netid].active[sid]) {
254 nets[netid].active[sid] = NULL;
255 nets[netid].nact--;
256 }
257 spin_unlock(&nets[netid].lock);
258 } else {
259 if (netif_msg_intr(rnet))
260 printk(KERN_WARNING "%s: unhandled doorbell\n",
261 DRV_NAME);
262 }
263}
264
265static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
266{
267 int n;
268 struct net_device *ndev = dev_id;
269 struct rionet_private *rnet = netdev_priv(ndev);
270
271 if (netif_msg_intr(rnet))
272 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
273 DRV_NAME, mbox, slot);
274
275 spin_lock(&rnet->lock);
276 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
277 rionet_rx_fill(ndev, n);
278 spin_unlock(&rnet->lock);
279}
280
281static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
282{
283 struct net_device *ndev = dev_id;
284 struct rionet_private *rnet = netdev_priv(ndev);
285
286 spin_lock(&rnet->tx_lock);
287
288 if (netif_msg_intr(rnet))
289 printk(KERN_INFO
290 "%s: outbound message event, mbox %d slot %d\n",
291 DRV_NAME, mbox, slot);
292
293 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
294 /* dma unmap single */
295 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
296 rnet->tx_skb[rnet->ack_slot] = NULL;
297 ++rnet->ack_slot;
298 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
299 rnet->tx_cnt--;
300 }
301
302 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
303 netif_wake_queue(ndev);
304
305 spin_unlock(&rnet->tx_lock);
306}
307
308static int rionet_open(struct net_device *ndev)
309{
310 int i, rc = 0;
311 struct rionet_peer *peer;
312 struct rionet_private *rnet = netdev_priv(ndev);
313 unsigned char netid = rnet->mport->id;
314 unsigned long flags;
315
316 if (netif_msg_ifup(rnet))
317 printk(KERN_INFO "%s: open\n", DRV_NAME);
318
319 if ((rc = rio_request_inb_dbell(rnet->mport,
320 (void *)ndev,
321 RIONET_DOORBELL_JOIN,
322 RIONET_DOORBELL_LEAVE,
323 rionet_dbell_event)) < 0)
324 goto out;
325
326 if ((rc = rio_request_inb_mbox(rnet->mport,
327 (void *)ndev,
328 RIONET_MAILBOX,
329 RIONET_RX_RING_SIZE,
330 rionet_inb_msg_event)) < 0)
331 goto out;
332
333 if ((rc = rio_request_outb_mbox(rnet->mport,
334 (void *)ndev,
335 RIONET_MAILBOX,
336 RIONET_TX_RING_SIZE,
337 rionet_outb_msg_event)) < 0)
338 goto out;
339
340 /* Initialize inbound message ring */
341 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
342 rnet->rx_skb[i] = NULL;
343 rnet->rx_slot = 0;
344 rionet_rx_fill(ndev, 0);
345
346 rnet->tx_slot = 0;
347 rnet->tx_cnt = 0;
348 rnet->ack_slot = 0;
349
350 netif_carrier_on(ndev);
351 netif_start_queue(ndev);
352
353 spin_lock_irqsave(&nets[netid].lock, flags);
354 list_for_each_entry(peer, &nets[netid].peers, node) {
355 /* Send a join message */
356 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
357 }
358 spin_unlock_irqrestore(&nets[netid].lock, flags);
359 rnet->open = true;
360
361 out:
362 return rc;
363}
364
365static int rionet_close(struct net_device *ndev)
366{
367 struct rionet_private *rnet = netdev_priv(ndev);
368 struct rionet_peer *peer;
369 unsigned char netid = rnet->mport->id;
370 unsigned long flags;
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 rnet->open = false;
379
380 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
381 kfree_skb(rnet->rx_skb[i]);
382
383 spin_lock_irqsave(&nets[netid].lock, flags);
384 list_for_each_entry(peer, &nets[netid].peers, node) {
385 if (nets[netid].active[peer->rdev->destid]) {
386 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
387 nets[netid].active[peer->rdev->destid] = NULL;
388 }
389 if (peer->res)
390 rio_release_outb_dbell(peer->rdev, peer->res);
391 }
392 spin_unlock_irqrestore(&nets[netid].lock, flags);
393
394 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
395 RIONET_DOORBELL_LEAVE);
396 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
397 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
398
399 return 0;
400}
401
402static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
403{
404 struct rio_dev *rdev = to_rio_dev(dev);
405 unsigned char netid = rdev->net->hport->id;
406 struct rionet_peer *peer;
407 int state, found = 0;
408 unsigned long flags;
409
410 if (!dev_rionet_capable(rdev))
411 return;
412
413 spin_lock_irqsave(&nets[netid].lock, flags);
414 list_for_each_entry(peer, &nets[netid].peers, node) {
415 if (peer->rdev == rdev) {
416 list_del(&peer->node);
417 if (nets[netid].active[rdev->destid]) {
418 state = atomic_read(&rdev->state);
419 if (state != RIO_DEVICE_GONE &&
420 state != RIO_DEVICE_INITIALIZING) {
421 rio_send_doorbell(rdev,
422 RIONET_DOORBELL_LEAVE);
423 }
424 nets[netid].active[rdev->destid] = NULL;
425 nets[netid].nact--;
426 }
427 found = 1;
428 break;
429 }
430 }
431 spin_unlock_irqrestore(&nets[netid].lock, flags);
432
433 if (found) {
434 if (peer->res)
435 rio_release_outb_dbell(rdev, peer->res);
436 kfree(peer);
437 }
438}
439
440static void rionet_get_drvinfo(struct net_device *ndev,
441 struct ethtool_drvinfo *info)
442{
443 struct rionet_private *rnet = netdev_priv(ndev);
444
445 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
446 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
447 strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
448 strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
449}
450
451static u32 rionet_get_msglevel(struct net_device *ndev)
452{
453 struct rionet_private *rnet = netdev_priv(ndev);
454
455 return rnet->msg_enable;
456}
457
458static void rionet_set_msglevel(struct net_device *ndev, u32 value)
459{
460 struct rionet_private *rnet = netdev_priv(ndev);
461
462 rnet->msg_enable = value;
463}
464
465static const struct ethtool_ops rionet_ethtool_ops = {
466 .get_drvinfo = rionet_get_drvinfo,
467 .get_msglevel = rionet_get_msglevel,
468 .set_msglevel = rionet_set_msglevel,
469 .get_link = ethtool_op_get_link,
470};
471
472static const struct net_device_ops rionet_netdev_ops = {
473 .ndo_open = rionet_open,
474 .ndo_stop = rionet_close,
475 .ndo_start_xmit = rionet_start_xmit,
476 .ndo_validate_addr = eth_validate_addr,
477 .ndo_set_mac_address = eth_mac_addr,
478};
479
480static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
481{
482 int rc = 0;
483 struct rionet_private *rnet;
484 u16 device_id;
485 const size_t rionet_active_bytes = sizeof(void *) *
486 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
487
488 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
489 get_order(rionet_active_bytes));
490 if (!nets[mport->id].active) {
491 rc = -ENOMEM;
492 goto out;
493 }
494 memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
495
496 /* Set up private area */
497 rnet = netdev_priv(ndev);
498 rnet->mport = mport;
499 rnet->open = false;
500
501 /* Set the default MAC address */
502 device_id = rio_local_get_device_id(mport);
503 ndev->dev_addr[0] = 0x00;
504 ndev->dev_addr[1] = 0x01;
505 ndev->dev_addr[2] = 0x00;
506 ndev->dev_addr[3] = 0x01;
507 ndev->dev_addr[4] = device_id >> 8;
508 ndev->dev_addr[5] = device_id & 0xff;
509
510 ndev->netdev_ops = &rionet_netdev_ops;
511 ndev->mtu = RIONET_MAX_MTU;
512 /* MTU range: 68 - 4082 */
513 ndev->min_mtu = ETH_MIN_MTU;
514 ndev->max_mtu = RIONET_MAX_MTU;
515 ndev->features = NETIF_F_LLTX;
516 SET_NETDEV_DEV(ndev, &mport->dev);
517 ndev->ethtool_ops = &rionet_ethtool_ops;
518
519 spin_lock_init(&rnet->lock);
520 spin_lock_init(&rnet->tx_lock);
521
522 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
523
524 rc = register_netdev(ndev);
525 if (rc != 0) {
526 free_pages((unsigned long)nets[mport->id].active,
527 get_order(rionet_active_bytes));
528 goto out;
529 }
530
531 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
532 ndev->name,
533 DRV_NAME,
534 DRV_DESC,
535 DRV_VERSION,
536 ndev->dev_addr,
537 mport->name);
538
539 out:
540 return rc;
541}
542
543static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
544{
545 int rc = -ENODEV;
546 u32 lsrc_ops, ldst_ops;
547 struct rionet_peer *peer;
548 struct net_device *ndev = NULL;
549 struct rio_dev *rdev = to_rio_dev(dev);
550 unsigned char netid = rdev->net->hport->id;
551
552 if (netid >= RIONET_MAX_NETS)
553 return rc;
554
555 /*
556 * If first time through this net, make sure local device is rionet
557 * capable and setup netdev (this step will be skipped in later probes
558 * on the same net).
559 */
560 if (!nets[netid].ndev) {
561 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
562 &lsrc_ops);
563 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
564 &ldst_ops);
565 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
566 printk(KERN_ERR
567 "%s: local device %s is not network capable\n",
568 DRV_NAME, rdev->net->hport->name);
569 goto out;
570 }
571
572 /* Allocate our net_device structure */
573 ndev = alloc_etherdev(sizeof(struct rionet_private));
574 if (ndev == NULL) {
575 rc = -ENOMEM;
576 goto out;
577 }
578
579 rc = rionet_setup_netdev(rdev->net->hport, ndev);
580 if (rc) {
581 printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
582 DRV_NAME, rc);
583 free_netdev(ndev);
584 goto out;
585 }
586
587 INIT_LIST_HEAD(&nets[netid].peers);
588 spin_lock_init(&nets[netid].lock);
589 nets[netid].nact = 0;
590 nets[netid].ndev = ndev;
591 }
592
593 /*
594 * If the remote device has mailbox/doorbell capabilities,
595 * add it to the peer list.
596 */
597 if (dev_rionet_capable(rdev)) {
598 struct rionet_private *rnet;
599 unsigned long flags;
600
601 rnet = netdev_priv(nets[netid].ndev);
602
603 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
604 if (!peer) {
605 rc = -ENOMEM;
606 goto out;
607 }
608 peer->rdev = rdev;
609 peer->res = rio_request_outb_dbell(peer->rdev,
610 RIONET_DOORBELL_JOIN,
611 RIONET_DOORBELL_LEAVE);
612 if (!peer->res) {
613 pr_err("%s: error requesting doorbells\n", DRV_NAME);
614 kfree(peer);
615 rc = -ENOMEM;
616 goto out;
617 }
618
619 spin_lock_irqsave(&nets[netid].lock, flags);
620 list_add_tail(&peer->node, &nets[netid].peers);
621 spin_unlock_irqrestore(&nets[netid].lock, flags);
622 pr_debug("%s: %s add peer %s\n",
623 DRV_NAME, __func__, rio_name(rdev));
624
625 /* If netdev is already opened, send join request to new peer */
626 if (rnet->open)
627 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
628 }
629
630 return 0;
631out:
632 return rc;
633}
634
635static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
636 void *unused)
637{
638 struct rionet_peer *peer;
639 unsigned long flags;
640 int i;
641
642 pr_debug("%s: %s\n", DRV_NAME, __func__);
643
644 for (i = 0; i < RIONET_MAX_NETS; i++) {
645 if (!nets[i].ndev)
646 continue;
647
648 spin_lock_irqsave(&nets[i].lock, flags);
649 list_for_each_entry(peer, &nets[i].peers, node) {
650 if (nets[i].active[peer->rdev->destid]) {
651 rio_send_doorbell(peer->rdev,
652 RIONET_DOORBELL_LEAVE);
653 nets[i].active[peer->rdev->destid] = NULL;
654 }
655 }
656 spin_unlock_irqrestore(&nets[i].lock, flags);
657 }
658
659 return NOTIFY_DONE;
660}
661
662static void rionet_remove_mport(struct device *dev,
663 struct class_interface *class_intf)
664{
665 struct rio_mport *mport = to_rio_mport(dev);
666 struct net_device *ndev;
667 int id = mport->id;
668
669 pr_debug("%s %s\n", __func__, mport->name);
670
671 WARN(nets[id].nact, "%s called when connected to %d peers\n",
672 __func__, nets[id].nact);
673 WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
674 __func__);
675
676 if (nets[id].ndev) {
677 ndev = nets[id].ndev;
678 netif_stop_queue(ndev);
679 unregister_netdev(ndev);
680
681 free_pages((unsigned long)nets[id].active,
682 get_order(sizeof(void *) *
683 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
684 nets[id].active = NULL;
685 free_netdev(ndev);
686 nets[id].ndev = NULL;
687 }
688}
689
690#ifdef MODULE
691static struct rio_device_id rionet_id_table[] = {
692 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
693 { 0, } /* terminate list */
694};
695
696MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
697#endif
698
699static struct subsys_interface rionet_interface = {
700 .name = "rionet",
701 .subsys = &rio_bus_type,
702 .add_dev = rionet_add_dev,
703 .remove_dev = rionet_remove_dev,
704};
705
706static struct notifier_block rionet_notifier = {
707 .notifier_call = rionet_shutdown,
708};
709
710/* the rio_mport_interface is used to handle local mport devices */
711static struct class_interface rio_mport_interface __refdata = {
712 .class = &rio_mport_class,
713 .add_dev = NULL,
714 .remove_dev = rionet_remove_mport,
715};
716
717static int __init rionet_init(void)
718{
719 int ret;
720
721 ret = register_reboot_notifier(&rionet_notifier);
722 if (ret) {
723 pr_err("%s: failed to register reboot notifier (err=%d)\n",
724 DRV_NAME, ret);
725 return ret;
726 }
727
728 ret = class_interface_register(&rio_mport_interface);
729 if (ret) {
730 pr_err("%s: class_interface_register error: %d\n",
731 DRV_NAME, ret);
732 return ret;
733 }
734
735 return subsys_interface_register(&rionet_interface);
736}
737
738static void __exit rionet_exit(void)
739{
740 unregister_reboot_notifier(&rionet_notifier);
741 subsys_interface_unregister(&rionet_interface);
742 class_interface_unregister(&rio_mport_interface);
743}
744
745late_initcall(rionet_init);
746module_exit(rionet_exit);