2b8fd68bc5163b49a09b373fb1913d6793bc051e
[linux-2.6.git] / drivers / net / rionet.c
1 /*
2  * rionet - Ethernet driver over RapidIO messaging services
3  *
4  * Copyright 2005 MontaVista Software, Inc.
5  * Matt Porter <mporter@kernel.crashing.org>
6  *
7  * This program is free software; you can redistribute  it and/or modify it
8  * under  the terms of  the GNU General  Public License as published by the
9  * Free Software Foundation;  either version 2 of the  License, or (at your
10  * option) any later version.
11  */
12
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/delay.h>
17 #include <linux/rio.h>
18 #include <linux/rio_drv.h>
19 #include <linux/rio_ids.h>
20
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
23 #include <linux/skbuff.h>
24 #include <linux/crc32.h>
25 #include <linux/ethtool.h>
26
27 #define DRV_NAME        "rionet"
28 #define DRV_VERSION     "0.2"
29 #define DRV_AUTHOR      "Matt Porter <mporter@kernel.crashing.org>"
30 #define DRV_DESC        "Ethernet over RapidIO"
31
32 MODULE_AUTHOR(DRV_AUTHOR);
33 MODULE_DESCRIPTION(DRV_DESC);
34 MODULE_LICENSE("GPL");
35
36 #define RIONET_DEFAULT_MSGLEVEL \
37                         (NETIF_MSG_DRV          | \
38                          NETIF_MSG_LINK         | \
39                          NETIF_MSG_RX_ERR       | \
40                          NETIF_MSG_TX_ERR)
41
42 #define RIONET_DOORBELL_JOIN    0x1000
43 #define RIONET_DOORBELL_LEAVE   0x1001
44
45 #define RIONET_MAILBOX          0
46
47 #define RIONET_TX_RING_SIZE     CONFIG_RIONET_TX_SIZE
48 #define RIONET_RX_RING_SIZE     CONFIG_RIONET_RX_SIZE
49
50 static LIST_HEAD(rionet_peers);
51
52 struct rionet_private {
53         struct rio_mport *mport;
54         struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
55         struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
56         int rx_slot;
57         int tx_slot;
58         int tx_cnt;
59         int ack_slot;
60         spinlock_t lock;
61         spinlock_t tx_lock;
62         u32 msg_enable;
63 };
64
65 struct rionet_peer {
66         struct list_head node;
67         struct rio_dev *rdev;
68         struct resource *res;
69 };
70
71 static int rionet_check = 0;
72 static int rionet_capable = 1;
73
74 /*
75  * This is a fast lookup table for for translating TX
76  * Ethernet packets into a destination RIO device. It
77  * could be made into a hash table to save memory depending
78  * on system trade-offs.
79  */
80 static struct rio_dev **rionet_active;
81
82 #define is_rionet_capable(pef, src_ops, dst_ops)                \
83                         ((pef & RIO_PEF_INB_MBOX) &&            \
84                          (pef & RIO_PEF_INB_DOORBELL) &&        \
85                          (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
86                          (dst_ops & RIO_DST_OPS_DOORBELL))
87 #define dev_rionet_capable(dev) \
88         is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
89
90 #define RIONET_MAC_MATCH(x)     (*(u32 *)x == 0x00010001)
91 #define RIONET_GET_DESTID(x)    (*(u16 *)(x + 4))
92
93 static int rionet_rx_clean(struct net_device *ndev)
94 {
95         int i;
96         int error = 0;
97         struct rionet_private *rnet = ndev->priv;
98         void *data;
99
100         i = rnet->rx_slot;
101
102         do {
103                 if (!rnet->rx_skb[i])
104                         continue;
105
106                 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
107                         break;
108
109                 rnet->rx_skb[i]->data = data;
110                 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
111                 rnet->rx_skb[i]->protocol =
112                     eth_type_trans(rnet->rx_skb[i], ndev);
113                 error = netif_rx(rnet->rx_skb[i]);
114
115                 if (error == NET_RX_DROP) {
116                         ndev->stats.rx_dropped++;
117                 } else if (error == NET_RX_BAD) {
118                         if (netif_msg_rx_err(rnet))
119                                 printk(KERN_WARNING "%s: bad rx packet\n",
120                                        DRV_NAME);
121                         ndev->stats.rx_errors++;
122                 } else {
123                         ndev->stats.rx_packets++;
124                         ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
125                 }
126
127         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
128
129         return i;
130 }
131
132 static void rionet_rx_fill(struct net_device *ndev, int end)
133 {
134         int i;
135         struct rionet_private *rnet = ndev->priv;
136
137         i = rnet->rx_slot;
138         do {
139                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
140
141                 if (!rnet->rx_skb[i])
142                         break;
143
144                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
145                                    rnet->rx_skb[i]->data);
146         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
147
148         rnet->rx_slot = i;
149 }
150
151 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
152                                struct rio_dev *rdev)
153 {
154         struct rionet_private *rnet = ndev->priv;
155
156         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
157         rnet->tx_skb[rnet->tx_slot] = skb;
158
159         ndev->stats.tx_packets++;
160         ndev->stats.tx_bytes += skb->len;
161
162         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
163                 netif_stop_queue(ndev);
164
165         ++rnet->tx_slot;
166         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
167
168         if (netif_msg_tx_queued(rnet))
169                 printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
170                        (u32) skb, skb->len);
171
172         return 0;
173 }
174
175 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
176 {
177         int i;
178         struct rionet_private *rnet = ndev->priv;
179         struct ethhdr *eth = (struct ethhdr *)skb->data;
180         u16 destid;
181         unsigned long flags;
182
183         local_irq_save(flags);
184         if (!spin_trylock(&rnet->tx_lock)) {
185                 local_irq_restore(flags);
186                 return NETDEV_TX_LOCKED;
187         }
188
189         if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
190                 netif_stop_queue(ndev);
191                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
192                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
193                        ndev->name);
194                 return NETDEV_TX_BUSY;
195         }
196
197         if (eth->h_dest[0] & 0x01) {
198                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
199                                 i++)
200                         if (rionet_active[i])
201                                 rionet_queue_tx_msg(skb, ndev,
202                                                     rionet_active[i]);
203         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
204                 destid = RIONET_GET_DESTID(eth->h_dest);
205                 if (rionet_active[destid])
206                         rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
207         }
208
209         spin_unlock_irqrestore(&rnet->tx_lock, flags);
210
211         return 0;
212 }
213
214 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
215                                u16 info)
216 {
217         struct net_device *ndev = dev_id;
218         struct rionet_private *rnet = ndev->priv;
219         struct rionet_peer *peer;
220
221         if (netif_msg_intr(rnet))
222                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
223                        DRV_NAME, sid, tid, info);
224         if (info == RIONET_DOORBELL_JOIN) {
225                 if (!rionet_active[sid]) {
226                         list_for_each_entry(peer, &rionet_peers, node) {
227                                 if (peer->rdev->destid == sid)
228                                         rionet_active[sid] = peer->rdev;
229                         }
230                         rio_mport_send_doorbell(mport, sid,
231                                                 RIONET_DOORBELL_JOIN);
232                 }
233         } else if (info == RIONET_DOORBELL_LEAVE) {
234                 rionet_active[sid] = NULL;
235         } else {
236                 if (netif_msg_intr(rnet))
237                         printk(KERN_WARNING "%s: unhandled doorbell\n",
238                                DRV_NAME);
239         }
240 }
241
242 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
243 {
244         int n;
245         struct net_device *ndev = dev_id;
246         struct rionet_private *rnet = (struct rionet_private *)ndev->priv;
247
248         if (netif_msg_intr(rnet))
249                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
250                        DRV_NAME, mbox, slot);
251
252         spin_lock(&rnet->lock);
253         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
254                 rionet_rx_fill(ndev, n);
255         spin_unlock(&rnet->lock);
256 }
257
258 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
259 {
260         struct net_device *ndev = dev_id;
261         struct rionet_private *rnet = ndev->priv;
262
263         spin_lock(&rnet->lock);
264
265         if (netif_msg_intr(rnet))
266                 printk(KERN_INFO
267                        "%s: outbound message event, mbox %d slot %d\n",
268                        DRV_NAME, mbox, slot);
269
270         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
271                 /* dma unmap single */
272                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
273                 rnet->tx_skb[rnet->ack_slot] = NULL;
274                 ++rnet->ack_slot;
275                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
276                 rnet->tx_cnt--;
277         }
278
279         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
280                 netif_wake_queue(ndev);
281
282         spin_unlock(&rnet->lock);
283 }
284
285 static int rionet_open(struct net_device *ndev)
286 {
287         int i, rc = 0;
288         struct rionet_peer *peer, *tmp;
289         u32 pwdcsr;
290         struct rionet_private *rnet = ndev->priv;
291
292         if (netif_msg_ifup(rnet))
293                 printk(KERN_INFO "%s: open\n", DRV_NAME);
294
295         if ((rc = rio_request_inb_dbell(rnet->mport,
296                                         (void *)ndev,
297                                         RIONET_DOORBELL_JOIN,
298                                         RIONET_DOORBELL_LEAVE,
299                                         rionet_dbell_event)) < 0)
300                 goto out;
301
302         if ((rc = rio_request_inb_mbox(rnet->mport,
303                                        (void *)ndev,
304                                        RIONET_MAILBOX,
305                                        RIONET_RX_RING_SIZE,
306                                        rionet_inb_msg_event)) < 0)
307                 goto out;
308
309         if ((rc = rio_request_outb_mbox(rnet->mport,
310                                         (void *)ndev,
311                                         RIONET_MAILBOX,
312                                         RIONET_TX_RING_SIZE,
313                                         rionet_outb_msg_event)) < 0)
314                 goto out;
315
316         /* Initialize inbound message ring */
317         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
318                 rnet->rx_skb[i] = NULL;
319         rnet->rx_slot = 0;
320         rionet_rx_fill(ndev, 0);
321
322         rnet->tx_slot = 0;
323         rnet->tx_cnt = 0;
324         rnet->ack_slot = 0;
325
326         netif_carrier_on(ndev);
327         netif_start_queue(ndev);
328
329         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
330                 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
331                                                          RIONET_DOORBELL_JOIN,
332                                                          RIONET_DOORBELL_LEAVE)))
333                 {
334                         printk(KERN_ERR "%s: error requesting doorbells\n",
335                                DRV_NAME);
336                         continue;
337                 }
338
339                 /*
340                  * If device has initialized inbound doorbells,
341                  * send a join message
342                  */
343                 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
344                 if (pwdcsr & RIO_DOORBELL_AVAIL)
345                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
346         }
347
348       out:
349         return rc;
350 }
351
352 static int rionet_close(struct net_device *ndev)
353 {
354         struct rionet_private *rnet = (struct rionet_private *)ndev->priv;
355         struct rionet_peer *peer, *tmp;
356         int i;
357
358         if (netif_msg_ifup(rnet))
359                 printk(KERN_INFO "%s: close\n", DRV_NAME);
360
361         netif_stop_queue(ndev);
362         netif_carrier_off(ndev);
363
364         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
365                 if (rnet->rx_skb[i])
366                         kfree_skb(rnet->rx_skb[i]);
367
368         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
369                 if (rionet_active[peer->rdev->destid]) {
370                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
371                         rionet_active[peer->rdev->destid] = NULL;
372                 }
373                 rio_release_outb_dbell(peer->rdev, peer->res);
374         }
375
376         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
377                               RIONET_DOORBELL_LEAVE);
378         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
379         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
380
381         return 0;
382 }
383
384 static void rionet_remove(struct rio_dev *rdev)
385 {
386         struct net_device *ndev = NULL;
387         struct rionet_peer *peer, *tmp;
388
389         free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
390                                         __ilog2(sizeof(void *)) + 4 : 0);
391         unregister_netdev(ndev);
392         kfree(ndev);
393
394         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
395                 list_del(&peer->node);
396                 kfree(peer);
397         }
398 }
399
400 static void rionet_get_drvinfo(struct net_device *ndev,
401                                struct ethtool_drvinfo *info)
402 {
403         struct rionet_private *rnet = ndev->priv;
404
405         strcpy(info->driver, DRV_NAME);
406         strcpy(info->version, DRV_VERSION);
407         strcpy(info->fw_version, "n/a");
408         strcpy(info->bus_info, rnet->mport->name);
409 }
410
411 static u32 rionet_get_msglevel(struct net_device *ndev)
412 {
413         struct rionet_private *rnet = ndev->priv;
414
415         return rnet->msg_enable;
416 }
417
418 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
419 {
420         struct rionet_private *rnet = ndev->priv;
421
422         rnet->msg_enable = value;
423 }
424
425 static const struct ethtool_ops rionet_ethtool_ops = {
426         .get_drvinfo = rionet_get_drvinfo,
427         .get_msglevel = rionet_get_msglevel,
428         .set_msglevel = rionet_set_msglevel,
429         .get_link = ethtool_op_get_link,
430 };
431
432 static int rionet_setup_netdev(struct rio_mport *mport)
433 {
434         int rc = 0;
435         struct net_device *ndev = NULL;
436         struct rionet_private *rnet;
437         u16 device_id;
438         DECLARE_MAC_BUF(mac);
439
440         /* Allocate our net_device structure */
441         ndev = alloc_etherdev(sizeof(struct rionet_private));
442         if (ndev == NULL) {
443                 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
444                        DRV_NAME);
445                 rc = -ENOMEM;
446                 goto out;
447         }
448
449         rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
450                         mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
451         if (!rionet_active) {
452                 rc = -ENOMEM;
453                 goto out;
454         }
455         memset((void *)rionet_active, 0, sizeof(void *) *
456                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
457
458         /* Set up private area */
459         rnet = (struct rionet_private *)ndev->priv;
460         rnet->mport = mport;
461
462         /* Set the default MAC address */
463         device_id = rio_local_get_device_id(mport);
464         ndev->dev_addr[0] = 0x00;
465         ndev->dev_addr[1] = 0x01;
466         ndev->dev_addr[2] = 0x00;
467         ndev->dev_addr[3] = 0x01;
468         ndev->dev_addr[4] = device_id >> 8;
469         ndev->dev_addr[5] = device_id & 0xff;
470
471         /* Fill in the driver function table */
472         ndev->open = &rionet_open;
473         ndev->hard_start_xmit = &rionet_start_xmit;
474         ndev->stop = &rionet_close;
475         ndev->mtu = RIO_MAX_MSG_SIZE - 14;
476         ndev->features = NETIF_F_LLTX;
477         SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
478
479         spin_lock_init(&rnet->lock);
480         spin_lock_init(&rnet->tx_lock);
481
482         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
483
484         rc = register_netdev(ndev);
485         if (rc != 0)
486                 goto out;
487
488         printk("%s: %s %s Version %s, MAC %s\n",
489                ndev->name,
490                DRV_NAME,
491                DRV_DESC,
492                DRV_VERSION,
493                print_mac(mac, ndev->dev_addr));
494
495       out:
496         return rc;
497 }
498
499 /*
500  * XXX Make multi-net safe
501  */
502 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
503 {
504         int rc = -ENODEV;
505         u32 lpef, lsrc_ops, ldst_ops;
506         struct rionet_peer *peer;
507
508         /* If local device is not rionet capable, give up quickly */
509         if (!rionet_capable)
510                 goto out;
511
512         /*
513          * First time through, make sure local device is rionet
514          * capable, setup netdev,  and set flags so this is skipped
515          * on later probes
516          */
517         if (!rionet_check) {
518                 rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
519                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
520                                          &lsrc_ops);
521                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
522                                          &ldst_ops);
523                 if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
524                         printk(KERN_ERR
525                                "%s: local device is not network capable\n",
526                                DRV_NAME);
527                         rionet_check = 1;
528                         rionet_capable = 0;
529                         goto out;
530                 }
531
532                 rc = rionet_setup_netdev(rdev->net->hport);
533                 rionet_check = 1;
534         }
535
536         /*
537          * If the remote device has mailbox/doorbell capabilities,
538          * add it to the peer list.
539          */
540         if (dev_rionet_capable(rdev)) {
541                 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
542                         rc = -ENOMEM;
543                         goto out;
544                 }
545                 peer->rdev = rdev;
546                 list_add_tail(&peer->node, &rionet_peers);
547         }
548
549       out:
550         return rc;
551 }
552
553 static struct rio_device_id rionet_id_table[] = {
554         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
555 };
556
557 static struct rio_driver rionet_driver = {
558         .name = "rionet",
559         .id_table = rionet_id_table,
560         .probe = rionet_probe,
561         .remove = rionet_remove,
562 };
563
564 static int __init rionet_init(void)
565 {
566         return rio_register_driver(&rionet_driver);
567 }
568
569 static void __exit rionet_exit(void)
570 {
571         rio_unregister_driver(&rionet_driver);
572 }
573
574 module_init(rionet_init);
575 module_exit(rionet_exit);