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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 | ||
34 | MODULE_AUTHOR(DRV_AUTHOR); | |
35 | MODULE_DESCRIPTION(DRV_DESC); | |
36 | MODULE_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 | ||
55 | struct 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 | ||
69 | struct rionet_peer { | |
70 | struct list_head node; | |
71 | struct rio_dev *rdev; | |
72 | struct resource *res; | |
73 | }; | |
74 | ||
75 | struct 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 | ||
83 | static 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 | ||
96 | static 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 | ||
130 | static 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 | ||
149 | static 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 | ||
173 | static 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 | atomic_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 | ||
230 | static 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 | ||
269 | static 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 | ||
285 | static 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 | ||
312 | static 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 | ||
369 | static 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 | ||
406 | static 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 | ||
444 | static 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 | ||
455 | static 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 | ||
462 | static 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 | ||
469 | static 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 | ||
476 | static 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 | ||
484 | static 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 | ||
547 | static 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; | |
635 | out: | |
636 | return rc; | |
637 | } | |
638 | ||
639 | static 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 | ||
666 | static 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 | |
695 | static struct rio_device_id rionet_id_table[] = { | |
696 | {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}, | |
697 | { 0, } /* terminate list */ | |
698 | }; | |
699 | ||
700 | MODULE_DEVICE_TABLE(rapidio, rionet_id_table); | |
701 | #endif | |
702 | ||
703 | static 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 | ||
710 | static struct notifier_block rionet_notifier = { | |
711 | .notifier_call = rionet_shutdown, | |
712 | }; | |
713 | ||
714 | /* the rio_mport_interface is used to handle local mport devices */ | |
715 | static struct class_interface rio_mport_interface __refdata = { | |
716 | .class = &rio_mport_class, | |
717 | .add_dev = NULL, | |
718 | .remove_dev = rionet_remove_mport, | |
719 | }; | |
720 | ||
721 | static 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 | ||
742 | static 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 | ||
749 | late_initcall(rionet_init); | |
750 | module_exit(rionet_exit); |