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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/*
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 local_irq_save(flags);
183 if (!spin_trylock(&rnet->tx_lock)) {
184 local_irq_restore(flags);
185 return NETDEV_TX_LOCKED;
186 }
187
188 if (is_multicast_ether_addr(eth->h_dest))
189 add_num = nets[rnet->mport->id].nact;
190
191 if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
192 netif_stop_queue(ndev);
193 spin_unlock_irqrestore(&rnet->tx_lock, flags);
194 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
195 ndev->name);
196 return NETDEV_TX_BUSY;
197 }
198
199 if (is_multicast_ether_addr(eth->h_dest)) {
200 int count = 0;
201
202 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
203 i++)
204 if (nets[rnet->mport->id].active[i]) {
205 rionet_queue_tx_msg(skb, ndev,
206 nets[rnet->mport->id].active[i]);
207 if (count)
208 atomic_inc(&skb->users);
209 count++;
210 }
211 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
212 destid = RIONET_GET_DESTID(eth->h_dest);
213 if (nets[rnet->mport->id].active[destid])
214 rionet_queue_tx_msg(skb, ndev,
215 nets[rnet->mport->id].active[destid]);
216 else {
217 /*
218 * If the target device was removed from the list of
219 * active peers but we still have TX packets targeting
220 * it just report sending a packet to the target
221 * (without actual packet transfer).
222 */
223 dev_kfree_skb_any(skb);
224 ndev->stats.tx_packets++;
225 ndev->stats.tx_bytes += skb->len;
226 }
227 }
228
229 spin_unlock_irqrestore(&rnet->tx_lock, flags);
230
231 return NETDEV_TX_OK;
232}
233
234static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
235 u16 info)
236{
237 struct net_device *ndev = dev_id;
238 struct rionet_private *rnet = netdev_priv(ndev);
239 struct rionet_peer *peer;
240 unsigned char netid = rnet->mport->id;
241
242 if (netif_msg_intr(rnet))
243 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
244 DRV_NAME, sid, tid, info);
245 if (info == RIONET_DOORBELL_JOIN) {
246 if (!nets[netid].active[sid]) {
247 spin_lock(&nets[netid].lock);
248 list_for_each_entry(peer, &nets[netid].peers, node) {
249 if (peer->rdev->destid == sid) {
250 nets[netid].active[sid] = peer->rdev;
251 nets[netid].nact++;
252 }
253 }
254 spin_unlock(&nets[netid].lock);
255
256 rio_mport_send_doorbell(mport, sid,
257 RIONET_DOORBELL_JOIN);
258 }
259 } else if (info == RIONET_DOORBELL_LEAVE) {
260 spin_lock(&nets[netid].lock);
261 if (nets[netid].active[sid]) {
262 nets[netid].active[sid] = NULL;
263 nets[netid].nact--;
264 }
265 spin_unlock(&nets[netid].lock);
266 } else {
267 if (netif_msg_intr(rnet))
268 printk(KERN_WARNING "%s: unhandled doorbell\n",
269 DRV_NAME);
270 }
271}
272
273static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
274{
275 int n;
276 struct net_device *ndev = dev_id;
277 struct rionet_private *rnet = netdev_priv(ndev);
278
279 if (netif_msg_intr(rnet))
280 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
281 DRV_NAME, mbox, slot);
282
283 spin_lock(&rnet->lock);
284 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
285 rionet_rx_fill(ndev, n);
286 spin_unlock(&rnet->lock);
287}
288
289static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
290{
291 struct net_device *ndev = dev_id;
292 struct rionet_private *rnet = netdev_priv(ndev);
293
294 spin_lock(&rnet->tx_lock);
295
296 if (netif_msg_intr(rnet))
297 printk(KERN_INFO
298 "%s: outbound message event, mbox %d slot %d\n",
299 DRV_NAME, mbox, slot);
300
301 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
302 /* dma unmap single */
303 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
304 rnet->tx_skb[rnet->ack_slot] = NULL;
305 ++rnet->ack_slot;
306 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
307 rnet->tx_cnt--;
308 }
309
310 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
311 netif_wake_queue(ndev);
312
313 spin_unlock(&rnet->tx_lock);
314}
315
316static int rionet_open(struct net_device *ndev)
317{
318 int i, rc = 0;
319 struct rionet_peer *peer;
320 struct rionet_private *rnet = netdev_priv(ndev);
321 unsigned char netid = rnet->mport->id;
322 unsigned long flags;
323
324 if (netif_msg_ifup(rnet))
325 printk(KERN_INFO "%s: open\n", DRV_NAME);
326
327 if ((rc = rio_request_inb_dbell(rnet->mport,
328 (void *)ndev,
329 RIONET_DOORBELL_JOIN,
330 RIONET_DOORBELL_LEAVE,
331 rionet_dbell_event)) < 0)
332 goto out;
333
334 if ((rc = rio_request_inb_mbox(rnet->mport,
335 (void *)ndev,
336 RIONET_MAILBOX,
337 RIONET_RX_RING_SIZE,
338 rionet_inb_msg_event)) < 0)
339 goto out;
340
341 if ((rc = rio_request_outb_mbox(rnet->mport,
342 (void *)ndev,
343 RIONET_MAILBOX,
344 RIONET_TX_RING_SIZE,
345 rionet_outb_msg_event)) < 0)
346 goto out;
347
348 /* Initialize inbound message ring */
349 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
350 rnet->rx_skb[i] = NULL;
351 rnet->rx_slot = 0;
352 rionet_rx_fill(ndev, 0);
353
354 rnet->tx_slot = 0;
355 rnet->tx_cnt = 0;
356 rnet->ack_slot = 0;
357
358 netif_carrier_on(ndev);
359 netif_start_queue(ndev);
360
361 spin_lock_irqsave(&nets[netid].lock, flags);
362 list_for_each_entry(peer, &nets[netid].peers, node) {
363 /* Send a join message */
364 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
365 }
366 spin_unlock_irqrestore(&nets[netid].lock, flags);
367 rnet->open = true;
368
369 out:
370 return rc;
371}
372
373static int rionet_close(struct net_device *ndev)
374{
375 struct rionet_private *rnet = netdev_priv(ndev);
376 struct rionet_peer *peer;
377 unsigned char netid = rnet->mport->id;
378 unsigned long flags;
379 int i;
380
381 if (netif_msg_ifup(rnet))
382 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
383
384 netif_stop_queue(ndev);
385 netif_carrier_off(ndev);
386 rnet->open = false;
387
388 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
389 kfree_skb(rnet->rx_skb[i]);
390
391 spin_lock_irqsave(&nets[netid].lock, flags);
392 list_for_each_entry(peer, &nets[netid].peers, node) {
393 if (nets[netid].active[peer->rdev->destid]) {
394 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
395 nets[netid].active[peer->rdev->destid] = NULL;
396 }
397 if (peer->res)
398 rio_release_outb_dbell(peer->rdev, peer->res);
399 }
400 spin_unlock_irqrestore(&nets[netid].lock, flags);
401
402 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
403 RIONET_DOORBELL_LEAVE);
404 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
405 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
406
407 return 0;
408}
409
410static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
411{
412 struct rio_dev *rdev = to_rio_dev(dev);
413 unsigned char netid = rdev->net->hport->id;
414 struct rionet_peer *peer;
415 int state, found = 0;
416 unsigned long flags;
417
418 if (!dev_rionet_capable(rdev))
419 return;
420
421 spin_lock_irqsave(&nets[netid].lock, flags);
422 list_for_each_entry(peer, &nets[netid].peers, node) {
423 if (peer->rdev == rdev) {
424 list_del(&peer->node);
425 if (nets[netid].active[rdev->destid]) {
426 state = atomic_read(&rdev->state);
427 if (state != RIO_DEVICE_GONE &&
428 state != RIO_DEVICE_INITIALIZING) {
429 rio_send_doorbell(rdev,
430 RIONET_DOORBELL_LEAVE);
431 }
432 nets[netid].active[rdev->destid] = NULL;
433 nets[netid].nact--;
434 }
435 found = 1;
436 break;
437 }
438 }
439 spin_unlock_irqrestore(&nets[netid].lock, flags);
440
441 if (found) {
442 if (peer->res)
443 rio_release_outb_dbell(rdev, peer->res);
444 kfree(peer);
445 }
446}
447
448static void rionet_get_drvinfo(struct net_device *ndev,
449 struct ethtool_drvinfo *info)
450{
451 struct rionet_private *rnet = netdev_priv(ndev);
452
453 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
454 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
455 strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
456 strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
457}
458
459static u32 rionet_get_msglevel(struct net_device *ndev)
460{
461 struct rionet_private *rnet = netdev_priv(ndev);
462
463 return rnet->msg_enable;
464}
465
466static void rionet_set_msglevel(struct net_device *ndev, u32 value)
467{
468 struct rionet_private *rnet = netdev_priv(ndev);
469
470 rnet->msg_enable = value;
471}
472
473static int rionet_change_mtu(struct net_device *ndev, int new_mtu)
474{
475 if ((new_mtu < 68) || (new_mtu > RIONET_MAX_MTU)) {
476 printk(KERN_ERR "%s: Invalid MTU size %d\n",
477 ndev->name, new_mtu);
478 return -EINVAL;
479 }
480 ndev->mtu = new_mtu;
481 return 0;
482}
483
484static const struct ethtool_ops rionet_ethtool_ops = {
485 .get_drvinfo = rionet_get_drvinfo,
486 .get_msglevel = rionet_get_msglevel,
487 .set_msglevel = rionet_set_msglevel,
488 .get_link = ethtool_op_get_link,
489};
490
491static const struct net_device_ops rionet_netdev_ops = {
492 .ndo_open = rionet_open,
493 .ndo_stop = rionet_close,
494 .ndo_start_xmit = rionet_start_xmit,
495 .ndo_change_mtu = rionet_change_mtu,
496 .ndo_validate_addr = eth_validate_addr,
497 .ndo_set_mac_address = eth_mac_addr,
498};
499
500static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
501{
502 int rc = 0;
503 struct rionet_private *rnet;
504 u16 device_id;
505 const size_t rionet_active_bytes = sizeof(void *) *
506 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
507
508 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
509 get_order(rionet_active_bytes));
510 if (!nets[mport->id].active) {
511 rc = -ENOMEM;
512 goto out;
513 }
514 memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
515
516 /* Set up private area */
517 rnet = netdev_priv(ndev);
518 rnet->mport = mport;
519 rnet->open = false;
520
521 /* Set the default MAC address */
522 device_id = rio_local_get_device_id(mport);
523 ndev->dev_addr[0] = 0x00;
524 ndev->dev_addr[1] = 0x01;
525 ndev->dev_addr[2] = 0x00;
526 ndev->dev_addr[3] = 0x01;
527 ndev->dev_addr[4] = device_id >> 8;
528 ndev->dev_addr[5] = device_id & 0xff;
529
530 ndev->netdev_ops = &rionet_netdev_ops;
531 ndev->mtu = RIONET_MAX_MTU;
532 ndev->features = NETIF_F_LLTX;
533 SET_NETDEV_DEV(ndev, &mport->dev);
534 ndev->ethtool_ops = &rionet_ethtool_ops;
535
536 spin_lock_init(&rnet->lock);
537 spin_lock_init(&rnet->tx_lock);
538
539 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
540
541 rc = register_netdev(ndev);
542 if (rc != 0) {
543 free_pages((unsigned long)nets[mport->id].active,
544 get_order(rionet_active_bytes));
545 goto out;
546 }
547
548 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
549 ndev->name,
550 DRV_NAME,
551 DRV_DESC,
552 DRV_VERSION,
553 ndev->dev_addr,
554 mport->name);
555
556 out:
557 return rc;
558}
559
560static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
561{
562 int rc = -ENODEV;
563 u32 lsrc_ops, ldst_ops;
564 struct rionet_peer *peer;
565 struct net_device *ndev = NULL;
566 struct rio_dev *rdev = to_rio_dev(dev);
567 unsigned char netid = rdev->net->hport->id;
568
569 if (netid >= RIONET_MAX_NETS)
570 return rc;
571
572 /*
573 * If first time through this net, make sure local device is rionet
574 * capable and setup netdev (this step will be skipped in later probes
575 * on the same net).
576 */
577 if (!nets[netid].ndev) {
578 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
579 &lsrc_ops);
580 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
581 &ldst_ops);
582 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
583 printk(KERN_ERR
584 "%s: local device %s is not network capable\n",
585 DRV_NAME, rdev->net->hport->name);
586 goto out;
587 }
588
589 /* Allocate our net_device structure */
590 ndev = alloc_etherdev(sizeof(struct rionet_private));
591 if (ndev == NULL) {
592 rc = -ENOMEM;
593 goto out;
594 }
595
596 rc = rionet_setup_netdev(rdev->net->hport, ndev);
597 if (rc) {
598 printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
599 DRV_NAME, rc);
600 free_netdev(ndev);
601 goto out;
602 }
603
604 INIT_LIST_HEAD(&nets[netid].peers);
605 spin_lock_init(&nets[netid].lock);
606 nets[netid].nact = 0;
607 nets[netid].ndev = ndev;
608 }
609
610 /*
611 * If the remote device has mailbox/doorbell capabilities,
612 * add it to the peer list.
613 */
614 if (dev_rionet_capable(rdev)) {
615 struct rionet_private *rnet;
616 unsigned long flags;
617
618 rnet = netdev_priv(nets[netid].ndev);
619
620 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
621 if (!peer) {
622 rc = -ENOMEM;
623 goto out;
624 }
625 peer->rdev = rdev;
626 peer->res = rio_request_outb_dbell(peer->rdev,
627 RIONET_DOORBELL_JOIN,
628 RIONET_DOORBELL_LEAVE);
629 if (!peer->res) {
630 pr_err("%s: error requesting doorbells\n", DRV_NAME);
631 kfree(peer);
632 rc = -ENOMEM;
633 goto out;
634 }
635
636 spin_lock_irqsave(&nets[netid].lock, flags);
637 list_add_tail(&peer->node, &nets[netid].peers);
638 spin_unlock_irqrestore(&nets[netid].lock, flags);
639 pr_debug("%s: %s add peer %s\n",
640 DRV_NAME, __func__, rio_name(rdev));
641
642 /* If netdev is already opened, send join request to new peer */
643 if (rnet->open)
644 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
645 }
646
647 return 0;
648out:
649 return rc;
650}
651
652static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
653 void *unused)
654{
655 struct rionet_peer *peer;
656 unsigned long flags;
657 int i;
658
659 pr_debug("%s: %s\n", DRV_NAME, __func__);
660
661 for (i = 0; i < RIONET_MAX_NETS; i++) {
662 if (!nets[i].ndev)
663 continue;
664
665 spin_lock_irqsave(&nets[i].lock, flags);
666 list_for_each_entry(peer, &nets[i].peers, node) {
667 if (nets[i].active[peer->rdev->destid]) {
668 rio_send_doorbell(peer->rdev,
669 RIONET_DOORBELL_LEAVE);
670 nets[i].active[peer->rdev->destid] = NULL;
671 }
672 }
673 spin_unlock_irqrestore(&nets[i].lock, flags);
674 }
675
676 return NOTIFY_DONE;
677}
678
679static void rionet_remove_mport(struct device *dev,
680 struct class_interface *class_intf)
681{
682 struct rio_mport *mport = to_rio_mport(dev);
683 struct net_device *ndev;
684 int id = mport->id;
685
686 pr_debug("%s %s\n", __func__, mport->name);
687
688 WARN(nets[id].nact, "%s called when connected to %d peers\n",
689 __func__, nets[id].nact);
690 WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
691 __func__);
692
693 if (nets[id].ndev) {
694 ndev = nets[id].ndev;
695 netif_stop_queue(ndev);
696 unregister_netdev(ndev);
697
698 free_pages((unsigned long)nets[id].active,
699 get_order(sizeof(void *) *
700 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
701 nets[id].active = NULL;
702 free_netdev(ndev);
703 nets[id].ndev = NULL;
704 }
705}
706
707#ifdef MODULE
708static struct rio_device_id rionet_id_table[] = {
709 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
710 { 0, } /* terminate list */
711};
712
713MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
714#endif
715
716static struct subsys_interface rionet_interface = {
717 .name = "rionet",
718 .subsys = &rio_bus_type,
719 .add_dev = rionet_add_dev,
720 .remove_dev = rionet_remove_dev,
721};
722
723static struct notifier_block rionet_notifier = {
724 .notifier_call = rionet_shutdown,
725};
726
727/* the rio_mport_interface is used to handle local mport devices */
728static struct class_interface rio_mport_interface __refdata = {
729 .class = &rio_mport_class,
730 .add_dev = NULL,
731 .remove_dev = rionet_remove_mport,
732};
733
734static int __init rionet_init(void)
735{
736 int ret;
737
738 ret = register_reboot_notifier(&rionet_notifier);
739 if (ret) {
740 pr_err("%s: failed to register reboot notifier (err=%d)\n",
741 DRV_NAME, ret);
742 return ret;
743 }
744
745 ret = class_interface_register(&rio_mport_interface);
746 if (ret) {
747 pr_err("%s: class_interface_register error: %d\n",
748 DRV_NAME, ret);
749 return ret;
750 }
751
752 return subsys_interface_register(&rionet_interface);
753}
754
755static void __exit rionet_exit(void)
756{
757 unregister_reboot_notifier(&rionet_notifier);
758 subsys_interface_unregister(&rionet_interface);
759 class_interface_unregister(&rio_mport_interface);
760}
761
762late_initcall(rionet_init);
763module_exit(rionet_exit);