ifb: add performance flags
[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/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
28 #define DRV_NAME        "rionet"
29 #define DRV_VERSION     "0.2"
30 #define DRV_AUTHOR      "Matt Porter <mporter@kernel.crashing.org>"
31 #define DRV_DESC        "Ethernet over RapidIO"
32
33 MODULE_AUTHOR(DRV_AUTHOR);
34 MODULE_DESCRIPTION(DRV_DESC);
35 MODULE_LICENSE("GPL");
36
37 #define RIONET_DEFAULT_MSGLEVEL \
38                         (NETIF_MSG_DRV          | \
39                          NETIF_MSG_LINK         | \
40                          NETIF_MSG_RX_ERR       | \
41                          NETIF_MSG_TX_ERR)
42
43 #define RIONET_DOORBELL_JOIN    0x1000
44 #define RIONET_DOORBELL_LEAVE   0x1001
45
46 #define RIONET_MAILBOX          0
47
48 #define RIONET_TX_RING_SIZE     CONFIG_RIONET_TX_SIZE
49 #define RIONET_RX_RING_SIZE     CONFIG_RIONET_RX_SIZE
50
51 static LIST_HEAD(rionet_peers);
52
53 struct rionet_private {
54         struct rio_mport *mport;
55         struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
56         struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
57         int rx_slot;
58         int tx_slot;
59         int tx_cnt;
60         int ack_slot;
61         spinlock_t lock;
62         spinlock_t tx_lock;
63         u32 msg_enable;
64 };
65
66 struct rionet_peer {
67         struct list_head node;
68         struct rio_dev *rdev;
69         struct resource *res;
70 };
71
72 static int rionet_check = 0;
73 static int rionet_capable = 1;
74
75 /*
76  * This is a fast lookup table for translating TX
77  * Ethernet packets into a destination RIO device. It
78  * could be made into a hash table to save memory depending
79  * on system trade-offs.
80  */
81 static struct rio_dev **rionet_active;
82
83 #define is_rionet_capable(pef, src_ops, dst_ops)                \
84                         ((pef & RIO_PEF_INB_MBOX) &&            \
85                          (pef & RIO_PEF_INB_DOORBELL) &&        \
86                          (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
87                          (dst_ops & RIO_DST_OPS_DOORBELL))
88 #define dev_rionet_capable(dev) \
89         is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
90
91 #define RIONET_MAC_MATCH(x)     (*(u32 *)x == 0x00010001)
92 #define RIONET_GET_DESTID(x)    (*(u16 *)(x + 4))
93
94 static int rionet_rx_clean(struct net_device *ndev)
95 {
96         int i;
97         int error = 0;
98         struct rionet_private *rnet = netdev_priv(ndev);
99         void *data;
100
101         i = rnet->rx_slot;
102
103         do {
104                 if (!rnet->rx_skb[i])
105                         continue;
106
107                 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
108                         break;
109
110                 rnet->rx_skb[i]->data = data;
111                 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
112                 rnet->rx_skb[i]->protocol =
113                     eth_type_trans(rnet->rx_skb[i], ndev);
114                 error = netif_rx(rnet->rx_skb[i]);
115
116                 if (error == NET_RX_DROP) {
117                         ndev->stats.rx_dropped++;
118                 } else {
119                         ndev->stats.rx_packets++;
120                         ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
121                 }
122
123         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
124
125         return i;
126 }
127
128 static void rionet_rx_fill(struct net_device *ndev, int end)
129 {
130         int i;
131         struct rionet_private *rnet = netdev_priv(ndev);
132
133         i = rnet->rx_slot;
134         do {
135                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
136
137                 if (!rnet->rx_skb[i])
138                         break;
139
140                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
141                                    rnet->rx_skb[i]->data);
142         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
143
144         rnet->rx_slot = i;
145 }
146
147 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
148                                struct rio_dev *rdev)
149 {
150         struct rionet_private *rnet = netdev_priv(ndev);
151
152         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
153         rnet->tx_skb[rnet->tx_slot] = skb;
154
155         ndev->stats.tx_packets++;
156         ndev->stats.tx_bytes += skb->len;
157
158         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
159                 netif_stop_queue(ndev);
160
161         ++rnet->tx_slot;
162         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
163
164         if (netif_msg_tx_queued(rnet))
165                 printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
166                        (u32) skb, skb->len);
167
168         return 0;
169 }
170
171 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
172 {
173         int i;
174         struct rionet_private *rnet = netdev_priv(ndev);
175         struct ethhdr *eth = (struct ethhdr *)skb->data;
176         u16 destid;
177         unsigned long flags;
178
179         local_irq_save(flags);
180         if (!spin_trylock(&rnet->tx_lock)) {
181                 local_irq_restore(flags);
182                 return NETDEV_TX_LOCKED;
183         }
184
185         if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
186                 netif_stop_queue(ndev);
187                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
188                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
189                        ndev->name);
190                 return NETDEV_TX_BUSY;
191         }
192
193         if (eth->h_dest[0] & 0x01) {
194                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
195                                 i++)
196                         if (rionet_active[i])
197                                 rionet_queue_tx_msg(skb, ndev,
198                                                     rionet_active[i]);
199         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
200                 destid = RIONET_GET_DESTID(eth->h_dest);
201                 if (rionet_active[destid])
202                         rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
203         }
204
205         spin_unlock_irqrestore(&rnet->tx_lock, flags);
206
207         return NETDEV_TX_OK;
208 }
209
210 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
211                                u16 info)
212 {
213         struct net_device *ndev = dev_id;
214         struct rionet_private *rnet = netdev_priv(ndev);
215         struct rionet_peer *peer;
216
217         if (netif_msg_intr(rnet))
218                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
219                        DRV_NAME, sid, tid, info);
220         if (info == RIONET_DOORBELL_JOIN) {
221                 if (!rionet_active[sid]) {
222                         list_for_each_entry(peer, &rionet_peers, node) {
223                                 if (peer->rdev->destid == sid)
224                                         rionet_active[sid] = peer->rdev;
225                         }
226                         rio_mport_send_doorbell(mport, sid,
227                                                 RIONET_DOORBELL_JOIN);
228                 }
229         } else if (info == RIONET_DOORBELL_LEAVE) {
230                 rionet_active[sid] = NULL;
231         } else {
232                 if (netif_msg_intr(rnet))
233                         printk(KERN_WARNING "%s: unhandled doorbell\n",
234                                DRV_NAME);
235         }
236 }
237
238 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
239 {
240         int n;
241         struct net_device *ndev = dev_id;
242         struct rionet_private *rnet = netdev_priv(ndev);
243
244         if (netif_msg_intr(rnet))
245                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
246                        DRV_NAME, mbox, slot);
247
248         spin_lock(&rnet->lock);
249         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
250                 rionet_rx_fill(ndev, n);
251         spin_unlock(&rnet->lock);
252 }
253
254 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
255 {
256         struct net_device *ndev = dev_id;
257         struct rionet_private *rnet = netdev_priv(ndev);
258
259         spin_lock(&rnet->lock);
260
261         if (netif_msg_intr(rnet))
262                 printk(KERN_INFO
263                        "%s: outbound message event, mbox %d slot %d\n",
264                        DRV_NAME, mbox, slot);
265
266         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
267                 /* dma unmap single */
268                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
269                 rnet->tx_skb[rnet->ack_slot] = NULL;
270                 ++rnet->ack_slot;
271                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
272                 rnet->tx_cnt--;
273         }
274
275         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
276                 netif_wake_queue(ndev);
277
278         spin_unlock(&rnet->lock);
279 }
280
281 static int rionet_open(struct net_device *ndev)
282 {
283         int i, rc = 0;
284         struct rionet_peer *peer, *tmp;
285         u32 pwdcsr;
286         struct rionet_private *rnet = netdev_priv(ndev);
287
288         if (netif_msg_ifup(rnet))
289                 printk(KERN_INFO "%s: open\n", DRV_NAME);
290
291         if ((rc = rio_request_inb_dbell(rnet->mport,
292                                         (void *)ndev,
293                                         RIONET_DOORBELL_JOIN,
294                                         RIONET_DOORBELL_LEAVE,
295                                         rionet_dbell_event)) < 0)
296                 goto out;
297
298         if ((rc = rio_request_inb_mbox(rnet->mport,
299                                        (void *)ndev,
300                                        RIONET_MAILBOX,
301                                        RIONET_RX_RING_SIZE,
302                                        rionet_inb_msg_event)) < 0)
303                 goto out;
304
305         if ((rc = rio_request_outb_mbox(rnet->mport,
306                                         (void *)ndev,
307                                         RIONET_MAILBOX,
308                                         RIONET_TX_RING_SIZE,
309                                         rionet_outb_msg_event)) < 0)
310                 goto out;
311
312         /* Initialize inbound message ring */
313         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
314                 rnet->rx_skb[i] = NULL;
315         rnet->rx_slot = 0;
316         rionet_rx_fill(ndev, 0);
317
318         rnet->tx_slot = 0;
319         rnet->tx_cnt = 0;
320         rnet->ack_slot = 0;
321
322         netif_carrier_on(ndev);
323         netif_start_queue(ndev);
324
325         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
326                 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
327                                                          RIONET_DOORBELL_JOIN,
328                                                          RIONET_DOORBELL_LEAVE)))
329                 {
330                         printk(KERN_ERR "%s: error requesting doorbells\n",
331                                DRV_NAME);
332                         continue;
333                 }
334
335                 /*
336                  * If device has initialized inbound doorbells,
337                  * send a join message
338                  */
339                 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
340                 if (pwdcsr & RIO_DOORBELL_AVAIL)
341                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
342         }
343
344       out:
345         return rc;
346 }
347
348 static int rionet_close(struct net_device *ndev)
349 {
350         struct rionet_private *rnet = netdev_priv(ndev);
351         struct rionet_peer *peer, *tmp;
352         int i;
353
354         if (netif_msg_ifup(rnet))
355                 printk(KERN_INFO "%s: close\n", DRV_NAME);
356
357         netif_stop_queue(ndev);
358         netif_carrier_off(ndev);
359
360         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
361                 kfree_skb(rnet->rx_skb[i]);
362
363         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
364                 if (rionet_active[peer->rdev->destid]) {
365                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
366                         rionet_active[peer->rdev->destid] = NULL;
367                 }
368                 rio_release_outb_dbell(peer->rdev, peer->res);
369         }
370
371         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
372                               RIONET_DOORBELL_LEAVE);
373         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
374         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
375
376         return 0;
377 }
378
379 static void rionet_remove(struct rio_dev *rdev)
380 {
381         struct net_device *ndev = NULL;
382         struct rionet_peer *peer, *tmp;
383
384         free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
385                                         __ilog2(sizeof(void *)) + 4 : 0);
386         unregister_netdev(ndev);
387         free_netdev(ndev);
388
389         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
390                 list_del(&peer->node);
391                 kfree(peer);
392         }
393 }
394
395 static void rionet_get_drvinfo(struct net_device *ndev,
396                                struct ethtool_drvinfo *info)
397 {
398         struct rionet_private *rnet = netdev_priv(ndev);
399
400         strcpy(info->driver, DRV_NAME);
401         strcpy(info->version, DRV_VERSION);
402         strcpy(info->fw_version, "n/a");
403         strcpy(info->bus_info, rnet->mport->name);
404 }
405
406 static u32 rionet_get_msglevel(struct net_device *ndev)
407 {
408         struct rionet_private *rnet = netdev_priv(ndev);
409
410         return rnet->msg_enable;
411 }
412
413 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
414 {
415         struct rionet_private *rnet = netdev_priv(ndev);
416
417         rnet->msg_enable = value;
418 }
419
420 static const struct ethtool_ops rionet_ethtool_ops = {
421         .get_drvinfo = rionet_get_drvinfo,
422         .get_msglevel = rionet_get_msglevel,
423         .set_msglevel = rionet_set_msglevel,
424         .get_link = ethtool_op_get_link,
425 };
426
427 static const struct net_device_ops rionet_netdev_ops = {
428         .ndo_open               = rionet_open,
429         .ndo_stop               = rionet_close,
430         .ndo_start_xmit         = rionet_start_xmit,
431         .ndo_change_mtu         = eth_change_mtu,
432         .ndo_validate_addr      = eth_validate_addr,
433         .ndo_set_mac_address    = eth_mac_addr,
434 };
435
436 static int rionet_setup_netdev(struct rio_mport *mport)
437 {
438         int rc = 0;
439         struct net_device *ndev = NULL;
440         struct rionet_private *rnet;
441         u16 device_id;
442
443         /* Allocate our net_device structure */
444         ndev = alloc_etherdev(sizeof(struct rionet_private));
445         if (ndev == NULL) {
446                 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
447                        DRV_NAME);
448                 rc = -ENOMEM;
449                 goto out;
450         }
451
452         rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
453                         mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
454         if (!rionet_active) {
455                 rc = -ENOMEM;
456                 goto out;
457         }
458         memset((void *)rionet_active, 0, sizeof(void *) *
459                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
460
461         /* Set up private area */
462         rnet = netdev_priv(ndev);
463         rnet->mport = mport;
464
465         /* Set the default MAC address */
466         device_id = rio_local_get_device_id(mport);
467         ndev->dev_addr[0] = 0x00;
468         ndev->dev_addr[1] = 0x01;
469         ndev->dev_addr[2] = 0x00;
470         ndev->dev_addr[3] = 0x01;
471         ndev->dev_addr[4] = device_id >> 8;
472         ndev->dev_addr[5] = device_id & 0xff;
473
474         ndev->netdev_ops = &rionet_netdev_ops;
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 %pM\n",
489                ndev->name,
490                DRV_NAME,
491                DRV_DESC,
492                DRV_VERSION,
493                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);