Loading...
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 netdev_tx_t rionet_start_xmit(struct sk_buff *skb,
170 struct net_device *ndev)
171{
172 int i;
173 struct rionet_private *rnet = netdev_priv(ndev);
174 struct ethhdr *eth = (struct ethhdr *)skb->data;
175 u16 destid;
176 unsigned long flags;
177 int add_num = 1;
178
179 spin_lock_irqsave(&rnet->tx_lock, flags);
180
181 if (is_multicast_ether_addr(eth->h_dest))
182 add_num = nets[rnet->mport->id].nact;
183
184 if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
185 netif_stop_queue(ndev);
186 spin_unlock_irqrestore(&rnet->tx_lock, flags);
187 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
188 ndev->name);
189 return NETDEV_TX_BUSY;
190 }
191
192 if (is_multicast_ether_addr(eth->h_dest)) {
193 int count = 0;
194
195 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
196 i++)
197 if (nets[rnet->mport->id].active[i]) {
198 rionet_queue_tx_msg(skb, ndev,
199 nets[rnet->mport->id].active[i]);
200 if (count)
201 refcount_inc(&skb->users);
202 count++;
203 }
204 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
205 destid = RIONET_GET_DESTID(eth->h_dest);
206 if (nets[rnet->mport->id].active[destid])
207 rionet_queue_tx_msg(skb, ndev,
208 nets[rnet->mport->id].active[destid]);
209 else {
210 /*
211 * If the target device was removed from the list of
212 * active peers but we still have TX packets targeting
213 * it just report sending a packet to the target
214 * (without actual packet transfer).
215 */
216 ndev->stats.tx_packets++;
217 ndev->stats.tx_bytes += skb->len;
218 dev_kfree_skb_any(skb);
219 }
220 }
221
222 spin_unlock_irqrestore(&rnet->tx_lock, flags);
223
224 return NETDEV_TX_OK;
225}
226
227static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
228 u16 info)
229{
230 struct net_device *ndev = dev_id;
231 struct rionet_private *rnet = netdev_priv(ndev);
232 struct rionet_peer *peer;
233 unsigned char netid = rnet->mport->id;
234
235 if (netif_msg_intr(rnet))
236 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
237 DRV_NAME, sid, tid, info);
238 if (info == RIONET_DOORBELL_JOIN) {
239 if (!nets[netid].active[sid]) {
240 spin_lock(&nets[netid].lock);
241 list_for_each_entry(peer, &nets[netid].peers, node) {
242 if (peer->rdev->destid == sid) {
243 nets[netid].active[sid] = peer->rdev;
244 nets[netid].nact++;
245 }
246 }
247 spin_unlock(&nets[netid].lock);
248
249 rio_mport_send_doorbell(mport, sid,
250 RIONET_DOORBELL_JOIN);
251 }
252 } else if (info == RIONET_DOORBELL_LEAVE) {
253 spin_lock(&nets[netid].lock);
254 if (nets[netid].active[sid]) {
255 nets[netid].active[sid] = NULL;
256 nets[netid].nact--;
257 }
258 spin_unlock(&nets[netid].lock);
259 } else {
260 if (netif_msg_intr(rnet))
261 printk(KERN_WARNING "%s: unhandled doorbell\n",
262 DRV_NAME);
263 }
264}
265
266static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
267{
268 int n;
269 struct net_device *ndev = dev_id;
270 struct rionet_private *rnet = netdev_priv(ndev);
271
272 if (netif_msg_intr(rnet))
273 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
274 DRV_NAME, mbox, slot);
275
276 spin_lock(&rnet->lock);
277 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
278 rionet_rx_fill(ndev, n);
279 spin_unlock(&rnet->lock);
280}
281
282static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
283{
284 struct net_device *ndev = dev_id;
285 struct rionet_private *rnet = netdev_priv(ndev);
286
287 spin_lock(&rnet->tx_lock);
288
289 if (netif_msg_intr(rnet))
290 printk(KERN_INFO
291 "%s: outbound message event, mbox %d slot %d\n",
292 DRV_NAME, mbox, slot);
293
294 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
295 /* dma unmap single */
296 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
297 rnet->tx_skb[rnet->ack_slot] = NULL;
298 ++rnet->ack_slot;
299 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
300 rnet->tx_cnt--;
301 }
302
303 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
304 netif_wake_queue(ndev);
305
306 spin_unlock(&rnet->tx_lock);
307}
308
309static int rionet_open(struct net_device *ndev)
310{
311 int i, rc = 0;
312 struct rionet_peer *peer;
313 struct rionet_private *rnet = netdev_priv(ndev);
314 unsigned char netid = rnet->mport->id;
315 unsigned long flags;
316
317 if (netif_msg_ifup(rnet))
318 printk(KERN_INFO "%s: open\n", DRV_NAME);
319
320 if ((rc = rio_request_inb_dbell(rnet->mport,
321 (void *)ndev,
322 RIONET_DOORBELL_JOIN,
323 RIONET_DOORBELL_LEAVE,
324 rionet_dbell_event)) < 0)
325 goto out;
326
327 if ((rc = rio_request_inb_mbox(rnet->mport,
328 (void *)ndev,
329 RIONET_MAILBOX,
330 RIONET_RX_RING_SIZE,
331 rionet_inb_msg_event)) < 0)
332 goto out;
333
334 if ((rc = rio_request_outb_mbox(rnet->mport,
335 (void *)ndev,
336 RIONET_MAILBOX,
337 RIONET_TX_RING_SIZE,
338 rionet_outb_msg_event)) < 0)
339 goto out;
340
341 /* Initialize inbound message ring */
342 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
343 rnet->rx_skb[i] = NULL;
344 rnet->rx_slot = 0;
345 rionet_rx_fill(ndev, 0);
346
347 rnet->tx_slot = 0;
348 rnet->tx_cnt = 0;
349 rnet->ack_slot = 0;
350
351 netif_carrier_on(ndev);
352 netif_start_queue(ndev);
353
354 spin_lock_irqsave(&nets[netid].lock, flags);
355 list_for_each_entry(peer, &nets[netid].peers, node) {
356 /* Send a join message */
357 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
358 }
359 spin_unlock_irqrestore(&nets[netid].lock, flags);
360 rnet->open = true;
361
362 out:
363 return rc;
364}
365
366static int rionet_close(struct net_device *ndev)
367{
368 struct rionet_private *rnet = netdev_priv(ndev);
369 struct rionet_peer *peer;
370 unsigned char netid = rnet->mport->id;
371 unsigned long flags;
372 int i;
373
374 if (netif_msg_ifup(rnet))
375 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
376
377 netif_stop_queue(ndev);
378 netif_carrier_off(ndev);
379 rnet->open = false;
380
381 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
382 kfree_skb(rnet->rx_skb[i]);
383
384 spin_lock_irqsave(&nets[netid].lock, flags);
385 list_for_each_entry(peer, &nets[netid].peers, node) {
386 if (nets[netid].active[peer->rdev->destid]) {
387 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
388 nets[netid].active[peer->rdev->destid] = NULL;
389 }
390 if (peer->res)
391 rio_release_outb_dbell(peer->rdev, peer->res);
392 }
393 spin_unlock_irqrestore(&nets[netid].lock, flags);
394
395 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
396 RIONET_DOORBELL_LEAVE);
397 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
398 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
399
400 return 0;
401}
402
403static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
404{
405 struct rio_dev *rdev = to_rio_dev(dev);
406 unsigned char netid = rdev->net->hport->id;
407 struct rionet_peer *peer;
408 int state, found = 0;
409 unsigned long flags;
410
411 if (!dev_rionet_capable(rdev))
412 return;
413
414 spin_lock_irqsave(&nets[netid].lock, flags);
415 list_for_each_entry(peer, &nets[netid].peers, node) {
416 if (peer->rdev == rdev) {
417 list_del(&peer->node);
418 if (nets[netid].active[rdev->destid]) {
419 state = atomic_read(&rdev->state);
420 if (state != RIO_DEVICE_GONE &&
421 state != RIO_DEVICE_INITIALIZING) {
422 rio_send_doorbell(rdev,
423 RIONET_DOORBELL_LEAVE);
424 }
425 nets[netid].active[rdev->destid] = NULL;
426 nets[netid].nact--;
427 }
428 found = 1;
429 break;
430 }
431 }
432 spin_unlock_irqrestore(&nets[netid].lock, flags);
433
434 if (found) {
435 if (peer->res)
436 rio_release_outb_dbell(rdev, peer->res);
437 kfree(peer);
438 }
439}
440
441static void rionet_get_drvinfo(struct net_device *ndev,
442 struct ethtool_drvinfo *info)
443{
444 struct rionet_private *rnet = netdev_priv(ndev);
445
446 strscpy(info->driver, DRV_NAME, sizeof(info->driver));
447 strscpy(info->version, DRV_VERSION, sizeof(info->version));
448 strscpy(info->fw_version, "n/a", sizeof(info->fw_version));
449 strscpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
450}
451
452static u32 rionet_get_msglevel(struct net_device *ndev)
453{
454 struct rionet_private *rnet = netdev_priv(ndev);
455
456 return rnet->msg_enable;
457}
458
459static void rionet_set_msglevel(struct net_device *ndev, u32 value)
460{
461 struct rionet_private *rnet = netdev_priv(ndev);
462
463 rnet->msg_enable = value;
464}
465
466static const struct ethtool_ops rionet_ethtool_ops = {
467 .get_drvinfo = rionet_get_drvinfo,
468 .get_msglevel = rionet_get_msglevel,
469 .set_msglevel = rionet_set_msglevel,
470 .get_link = ethtool_op_get_link,
471};
472
473static const struct net_device_ops rionet_netdev_ops = {
474 .ndo_open = rionet_open,
475 .ndo_stop = rionet_close,
476 .ndo_start_xmit = rionet_start_xmit,
477 .ndo_validate_addr = eth_validate_addr,
478 .ndo_set_mac_address = eth_mac_addr,
479};
480
481static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
482{
483 int rc = 0;
484 struct rionet_private *rnet;
485 u8 addr[ETH_ALEN];
486 u16 device_id;
487 const size_t rionet_active_bytes = sizeof(void *) *
488 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
489
490 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
491 get_order(rionet_active_bytes));
492 if (!nets[mport->id].active) {
493 rc = -ENOMEM;
494 goto out;
495 }
496 memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
497
498 /* Set up private area */
499 rnet = netdev_priv(ndev);
500 rnet->mport = mport;
501 rnet->open = false;
502
503 /* Set the default MAC address */
504 device_id = rio_local_get_device_id(mport);
505 addr[0] = 0x00;
506 addr[1] = 0x01;
507 addr[2] = 0x00;
508 addr[3] = 0x01;
509 addr[4] = device_id >> 8;
510 addr[5] = device_id & 0xff;
511 eth_hw_addr_set(ndev, addr);
512
513 ndev->netdev_ops = &rionet_netdev_ops;
514 ndev->mtu = RIONET_MAX_MTU;
515 /* MTU range: 68 - 4082 */
516 ndev->min_mtu = ETH_MIN_MTU;
517 ndev->max_mtu = RIONET_MAX_MTU;
518 ndev->features = NETIF_F_LLTX;
519 SET_NETDEV_DEV(ndev, &mport->dev);
520 ndev->ethtool_ops = &rionet_ethtool_ops;
521
522 spin_lock_init(&rnet->lock);
523 spin_lock_init(&rnet->tx_lock);
524
525 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
526
527 rc = register_netdev(ndev);
528 if (rc != 0) {
529 free_pages((unsigned long)nets[mport->id].active,
530 get_order(rionet_active_bytes));
531 goto out;
532 }
533
534 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
535 ndev->name,
536 DRV_NAME,
537 DRV_DESC,
538 DRV_VERSION,
539 ndev->dev_addr,
540 mport->name);
541
542 out:
543 return rc;
544}
545
546static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
547{
548 int rc = -ENODEV;
549 u32 lsrc_ops, ldst_ops;
550 struct rionet_peer *peer;
551 struct net_device *ndev = NULL;
552 struct rio_dev *rdev = to_rio_dev(dev);
553 unsigned char netid = rdev->net->hport->id;
554
555 if (netid >= RIONET_MAX_NETS)
556 return rc;
557
558 /*
559 * If first time through this net, make sure local device is rionet
560 * capable and setup netdev (this step will be skipped in later probes
561 * on the same net).
562 */
563 if (!nets[netid].ndev) {
564 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
565 &lsrc_ops);
566 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
567 &ldst_ops);
568 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
569 printk(KERN_ERR
570 "%s: local device %s is not network capable\n",
571 DRV_NAME, rdev->net->hport->name);
572 goto out;
573 }
574
575 /* Allocate our net_device structure */
576 ndev = alloc_etherdev(sizeof(struct rionet_private));
577 if (ndev == NULL) {
578 rc = -ENOMEM;
579 goto out;
580 }
581
582 rc = rionet_setup_netdev(rdev->net->hport, ndev);
583 if (rc) {
584 printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
585 DRV_NAME, rc);
586 free_netdev(ndev);
587 goto out;
588 }
589
590 INIT_LIST_HEAD(&nets[netid].peers);
591 spin_lock_init(&nets[netid].lock);
592 nets[netid].nact = 0;
593 nets[netid].ndev = ndev;
594 }
595
596 /*
597 * If the remote device has mailbox/doorbell capabilities,
598 * add it to the peer list.
599 */
600 if (dev_rionet_capable(rdev)) {
601 struct rionet_private *rnet;
602 unsigned long flags;
603
604 rnet = netdev_priv(nets[netid].ndev);
605
606 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
607 if (!peer) {
608 rc = -ENOMEM;
609 goto out;
610 }
611 peer->rdev = rdev;
612 peer->res = rio_request_outb_dbell(peer->rdev,
613 RIONET_DOORBELL_JOIN,
614 RIONET_DOORBELL_LEAVE);
615 if (!peer->res) {
616 pr_err("%s: error requesting doorbells\n", DRV_NAME);
617 kfree(peer);
618 rc = -ENOMEM;
619 goto out;
620 }
621
622 spin_lock_irqsave(&nets[netid].lock, flags);
623 list_add_tail(&peer->node, &nets[netid].peers);
624 spin_unlock_irqrestore(&nets[netid].lock, flags);
625 pr_debug("%s: %s add peer %s\n",
626 DRV_NAME, __func__, rio_name(rdev));
627
628 /* If netdev is already opened, send join request to new peer */
629 if (rnet->open)
630 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
631 }
632
633 return 0;
634out:
635 return rc;
636}
637
638static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
639 void *unused)
640{
641 struct rionet_peer *peer;
642 unsigned long flags;
643 int i;
644
645 pr_debug("%s: %s\n", DRV_NAME, __func__);
646
647 for (i = 0; i < RIONET_MAX_NETS; i++) {
648 if (!nets[i].ndev)
649 continue;
650
651 spin_lock_irqsave(&nets[i].lock, flags);
652 list_for_each_entry(peer, &nets[i].peers, node) {
653 if (nets[i].active[peer->rdev->destid]) {
654 rio_send_doorbell(peer->rdev,
655 RIONET_DOORBELL_LEAVE);
656 nets[i].active[peer->rdev->destid] = NULL;
657 }
658 }
659 spin_unlock_irqrestore(&nets[i].lock, flags);
660 }
661
662 return NOTIFY_DONE;
663}
664
665static void rionet_remove_mport(struct device *dev)
666{
667 struct rio_mport *mport = to_rio_mport(dev);
668 struct net_device *ndev;
669 int id = mport->id;
670
671 pr_debug("%s %s\n", __func__, mport->name);
672
673 WARN(nets[id].nact, "%s called when connected to %d peers\n",
674 __func__, nets[id].nact);
675 WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
676 __func__);
677
678 if (nets[id].ndev) {
679 ndev = nets[id].ndev;
680 netif_stop_queue(ndev);
681 unregister_netdev(ndev);
682
683 free_pages((unsigned long)nets[id].active,
684 get_order(sizeof(void *) *
685 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
686 nets[id].active = NULL;
687 free_netdev(ndev);
688 nets[id].ndev = NULL;
689 }
690}
691
692#ifdef MODULE
693static struct rio_device_id rionet_id_table[] = {
694 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
695 { 0, } /* terminate list */
696};
697
698MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
699#endif
700
701static struct subsys_interface rionet_interface = {
702 .name = "rionet",
703 .subsys = &rio_bus_type,
704 .add_dev = rionet_add_dev,
705 .remove_dev = rionet_remove_dev,
706};
707
708static struct notifier_block rionet_notifier = {
709 .notifier_call = rionet_shutdown,
710};
711
712/* the rio_mport_interface is used to handle local mport devices */
713static struct class_interface rio_mport_interface __refdata = {
714 .class = &rio_mport_class,
715 .add_dev = NULL,
716 .remove_dev = rionet_remove_mport,
717};
718
719static int __init rionet_init(void)
720{
721 int ret;
722
723 ret = register_reboot_notifier(&rionet_notifier);
724 if (ret) {
725 pr_err("%s: failed to register reboot notifier (err=%d)\n",
726 DRV_NAME, ret);
727 return ret;
728 }
729
730 ret = class_interface_register(&rio_mport_interface);
731 if (ret) {
732 pr_err("%s: class_interface_register error: %d\n",
733 DRV_NAME, ret);
734 return ret;
735 }
736
737 return subsys_interface_register(&rionet_interface);
738}
739
740static void __exit rionet_exit(void)
741{
742 unregister_reboot_notifier(&rionet_notifier);
743 subsys_interface_unregister(&rionet_interface);
744 class_interface_unregister(&rio_mport_interface);
745}
746
747late_initcall(rionet_init);
748module_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);