macvlan: validate flags
[linux-3.10.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     "0.3"
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 #define RIONET_MAX_NETS         8
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 struct rionet_net {
72         struct net_device *ndev;
73         struct list_head peers;
74         struct rio_dev **active;
75         int nact;       /* number of active peers */
76 };
77
78 static struct rionet_net nets[RIONET_MAX_NETS];
79
80 #define is_rionet_capable(src_ops, dst_ops)                     \
81                         ((src_ops & RIO_SRC_OPS_DATA_MSG) &&    \
82                          (dst_ops & RIO_DST_OPS_DATA_MSG) &&    \
83                          (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
84                          (dst_ops & RIO_DST_OPS_DOORBELL))
85 #define dev_rionet_capable(dev) \
86         is_rionet_capable(dev->src_ops, dev->dst_ops)
87
88 #define RIONET_MAC_MATCH(x)     (!memcmp((x), "\00\01\00\01", 4))
89 #define RIONET_GET_DESTID(x)    ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
90
91 static int rionet_rx_clean(struct net_device *ndev)
92 {
93         int i;
94         int error = 0;
95         struct rionet_private *rnet = netdev_priv(ndev);
96         void *data;
97
98         i = rnet->rx_slot;
99
100         do {
101                 if (!rnet->rx_skb[i])
102                         continue;
103
104                 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
105                         break;
106
107                 rnet->rx_skb[i]->data = data;
108                 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
109                 rnet->rx_skb[i]->protocol =
110                     eth_type_trans(rnet->rx_skb[i], ndev);
111                 error = netif_rx(rnet->rx_skb[i]);
112
113                 if (error == NET_RX_DROP) {
114                         ndev->stats.rx_dropped++;
115                 } else {
116                         ndev->stats.rx_packets++;
117                         ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
118                 }
119
120         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
121
122         return i;
123 }
124
125 static void rionet_rx_fill(struct net_device *ndev, int end)
126 {
127         int i;
128         struct rionet_private *rnet = netdev_priv(ndev);
129
130         i = rnet->rx_slot;
131         do {
132                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
133
134                 if (!rnet->rx_skb[i])
135                         break;
136
137                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
138                                    rnet->rx_skb[i]->data);
139         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
140
141         rnet->rx_slot = i;
142 }
143
144 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
145                                struct rio_dev *rdev)
146 {
147         struct rionet_private *rnet = netdev_priv(ndev);
148
149         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
150         rnet->tx_skb[rnet->tx_slot] = skb;
151
152         ndev->stats.tx_packets++;
153         ndev->stats.tx_bytes += skb->len;
154
155         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
156                 netif_stop_queue(ndev);
157
158         ++rnet->tx_slot;
159         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
160
161         if (netif_msg_tx_queued(rnet))
162                 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
163                        skb->len);
164
165         return 0;
166 }
167
168 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
169 {
170         int i;
171         struct rionet_private *rnet = netdev_priv(ndev);
172         struct ethhdr *eth = (struct ethhdr *)skb->data;
173         u16 destid;
174         unsigned long flags;
175         int add_num = 1;
176
177         local_irq_save(flags);
178         if (!spin_trylock(&rnet->tx_lock)) {
179                 local_irq_restore(flags);
180                 return NETDEV_TX_LOCKED;
181         }
182
183         if (is_multicast_ether_addr(eth->h_dest))
184                 add_num = nets[rnet->mport->id].nact;
185
186         if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
187                 netif_stop_queue(ndev);
188                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
189                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
190                        ndev->name);
191                 return NETDEV_TX_BUSY;
192         }
193
194         if (is_multicast_ether_addr(eth->h_dest)) {
195                 int count = 0;
196
197                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
198                                 i++)
199                         if (nets[rnet->mport->id].active[i]) {
200                                 rionet_queue_tx_msg(skb, ndev,
201                                         nets[rnet->mport->id].active[i]);
202                                 if (count)
203                                         atomic_inc(&skb->users);
204                                 count++;
205                         }
206         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
207                 destid = RIONET_GET_DESTID(eth->h_dest);
208                 if (nets[rnet->mport->id].active[destid])
209                         rionet_queue_tx_msg(skb, ndev,
210                                         nets[rnet->mport->id].active[destid]);
211         }
212
213         spin_unlock_irqrestore(&rnet->tx_lock, flags);
214
215         return NETDEV_TX_OK;
216 }
217
218 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
219                                u16 info)
220 {
221         struct net_device *ndev = dev_id;
222         struct rionet_private *rnet = netdev_priv(ndev);
223         struct rionet_peer *peer;
224
225         if (netif_msg_intr(rnet))
226                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
227                        DRV_NAME, sid, tid, info);
228         if (info == RIONET_DOORBELL_JOIN) {
229                 if (!nets[rnet->mport->id].active[sid]) {
230                         list_for_each_entry(peer,
231                                            &nets[rnet->mport->id].peers, node) {
232                                 if (peer->rdev->destid == sid) {
233                                         nets[rnet->mport->id].active[sid] =
234                                                                 peer->rdev;
235                                         nets[rnet->mport->id].nact++;
236                                 }
237                         }
238                         rio_mport_send_doorbell(mport, sid,
239                                                 RIONET_DOORBELL_JOIN);
240                 }
241         } else if (info == RIONET_DOORBELL_LEAVE) {
242                 nets[rnet->mport->id].active[sid] = NULL;
243                 nets[rnet->mport->id].nact--;
244         } else {
245                 if (netif_msg_intr(rnet))
246                         printk(KERN_WARNING "%s: unhandled doorbell\n",
247                                DRV_NAME);
248         }
249 }
250
251 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
252 {
253         int n;
254         struct net_device *ndev = dev_id;
255         struct rionet_private *rnet = netdev_priv(ndev);
256
257         if (netif_msg_intr(rnet))
258                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
259                        DRV_NAME, mbox, slot);
260
261         spin_lock(&rnet->lock);
262         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
263                 rionet_rx_fill(ndev, n);
264         spin_unlock(&rnet->lock);
265 }
266
267 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
268 {
269         struct net_device *ndev = dev_id;
270         struct rionet_private *rnet = netdev_priv(ndev);
271
272         spin_lock(&rnet->lock);
273
274         if (netif_msg_intr(rnet))
275                 printk(KERN_INFO
276                        "%s: outbound message event, mbox %d slot %d\n",
277                        DRV_NAME, mbox, slot);
278
279         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
280                 /* dma unmap single */
281                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
282                 rnet->tx_skb[rnet->ack_slot] = NULL;
283                 ++rnet->ack_slot;
284                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
285                 rnet->tx_cnt--;
286         }
287
288         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
289                 netif_wake_queue(ndev);
290
291         spin_unlock(&rnet->lock);
292 }
293
294 static int rionet_open(struct net_device *ndev)
295 {
296         int i, rc = 0;
297         struct rionet_peer *peer, *tmp;
298         struct rionet_private *rnet = netdev_priv(ndev);
299
300         if (netif_msg_ifup(rnet))
301                 printk(KERN_INFO "%s: open\n", DRV_NAME);
302
303         if ((rc = rio_request_inb_dbell(rnet->mport,
304                                         (void *)ndev,
305                                         RIONET_DOORBELL_JOIN,
306                                         RIONET_DOORBELL_LEAVE,
307                                         rionet_dbell_event)) < 0)
308                 goto out;
309
310         if ((rc = rio_request_inb_mbox(rnet->mport,
311                                        (void *)ndev,
312                                        RIONET_MAILBOX,
313                                        RIONET_RX_RING_SIZE,
314                                        rionet_inb_msg_event)) < 0)
315                 goto out;
316
317         if ((rc = rio_request_outb_mbox(rnet->mport,
318                                         (void *)ndev,
319                                         RIONET_MAILBOX,
320                                         RIONET_TX_RING_SIZE,
321                                         rionet_outb_msg_event)) < 0)
322                 goto out;
323
324         /* Initialize inbound message ring */
325         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
326                 rnet->rx_skb[i] = NULL;
327         rnet->rx_slot = 0;
328         rionet_rx_fill(ndev, 0);
329
330         rnet->tx_slot = 0;
331         rnet->tx_cnt = 0;
332         rnet->ack_slot = 0;
333
334         netif_carrier_on(ndev);
335         netif_start_queue(ndev);
336
337         list_for_each_entry_safe(peer, tmp,
338                                  &nets[rnet->mport->id].peers, node) {
339                 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
340                                                          RIONET_DOORBELL_JOIN,
341                                                          RIONET_DOORBELL_LEAVE)))
342                 {
343                         printk(KERN_ERR "%s: error requesting doorbells\n",
344                                DRV_NAME);
345                         continue;
346                 }
347
348                 /* Send a join message */
349                 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
350         }
351
352       out:
353         return rc;
354 }
355
356 static int rionet_close(struct net_device *ndev)
357 {
358         struct rionet_private *rnet = netdev_priv(ndev);
359         struct rionet_peer *peer, *tmp;
360         int i;
361
362         if (netif_msg_ifup(rnet))
363                 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
364
365         netif_stop_queue(ndev);
366         netif_carrier_off(ndev);
367
368         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
369                 kfree_skb(rnet->rx_skb[i]);
370
371         list_for_each_entry_safe(peer, tmp,
372                                  &nets[rnet->mport->id].peers, node) {
373                 if (nets[rnet->mport->id].active[peer->rdev->destid]) {
374                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
375                         nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
376                 }
377                 rio_release_outb_dbell(peer->rdev, peer->res);
378         }
379
380         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
381                               RIONET_DOORBELL_LEAVE);
382         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
383         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
384
385         return 0;
386 }
387
388 static void rionet_remove(struct rio_dev *rdev)
389 {
390         struct net_device *ndev = rio_get_drvdata(rdev);
391         unsigned char netid = rdev->net->hport->id;
392         struct rionet_peer *peer, *tmp;
393
394         unregister_netdev(ndev);
395
396         free_pages((unsigned long)nets[netid].active, get_order(sizeof(void *) *
397                         RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size)));
398         nets[netid].active = NULL;
399
400         list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
401                 list_del(&peer->node);
402                 kfree(peer);
403         }
404
405         free_netdev(ndev);
406 }
407
408 static void rionet_get_drvinfo(struct net_device *ndev,
409                                struct ethtool_drvinfo *info)
410 {
411         struct rionet_private *rnet = netdev_priv(ndev);
412
413         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
414         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
415         strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
416         strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
417 }
418
419 static u32 rionet_get_msglevel(struct net_device *ndev)
420 {
421         struct rionet_private *rnet = netdev_priv(ndev);
422
423         return rnet->msg_enable;
424 }
425
426 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
427 {
428         struct rionet_private *rnet = netdev_priv(ndev);
429
430         rnet->msg_enable = value;
431 }
432
433 static const struct ethtool_ops rionet_ethtool_ops = {
434         .get_drvinfo = rionet_get_drvinfo,
435         .get_msglevel = rionet_get_msglevel,
436         .set_msglevel = rionet_set_msglevel,
437         .get_link = ethtool_op_get_link,
438 };
439
440 static const struct net_device_ops rionet_netdev_ops = {
441         .ndo_open               = rionet_open,
442         .ndo_stop               = rionet_close,
443         .ndo_start_xmit         = rionet_start_xmit,
444         .ndo_change_mtu         = eth_change_mtu,
445         .ndo_validate_addr      = eth_validate_addr,
446         .ndo_set_mac_address    = eth_mac_addr,
447 };
448
449 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
450 {
451         int rc = 0;
452         struct rionet_private *rnet;
453         u16 device_id;
454         const size_t rionet_active_bytes = sizeof(void *) *
455                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
456
457         nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
458                                                 get_order(rionet_active_bytes));
459         if (!nets[mport->id].active) {
460                 rc = -ENOMEM;
461                 goto out;
462         }
463         memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
464
465         /* Set up private area */
466         rnet = netdev_priv(ndev);
467         rnet->mport = mport;
468
469         /* Set the default MAC address */
470         device_id = rio_local_get_device_id(mport);
471         ndev->dev_addr[0] = 0x00;
472         ndev->dev_addr[1] = 0x01;
473         ndev->dev_addr[2] = 0x00;
474         ndev->dev_addr[3] = 0x01;
475         ndev->dev_addr[4] = device_id >> 8;
476         ndev->dev_addr[5] = device_id & 0xff;
477
478         ndev->netdev_ops = &rionet_netdev_ops;
479         ndev->mtu = RIO_MAX_MSG_SIZE - 14;
480         ndev->features = NETIF_F_LLTX;
481         SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
482
483         spin_lock_init(&rnet->lock);
484         spin_lock_init(&rnet->tx_lock);
485
486         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
487
488         rc = register_netdev(ndev);
489         if (rc != 0)
490                 goto out;
491
492         printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
493                ndev->name,
494                DRV_NAME,
495                DRV_DESC,
496                DRV_VERSION,
497                ndev->dev_addr,
498                mport->name);
499
500       out:
501         return rc;
502 }
503
504 static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
505
506 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
507 {
508         int rc = -ENODEV;
509         u32 lsrc_ops, ldst_ops;
510         struct rionet_peer *peer;
511         struct net_device *ndev = NULL;
512         unsigned char netid = rdev->net->hport->id;
513         int oldnet;
514
515         if (netid >= RIONET_MAX_NETS)
516                 return rc;
517
518         oldnet = test_and_set_bit(netid, net_table);
519
520         /*
521          * First time through, make sure local device is rionet
522          * capable, setup netdev (will be skipped on later probes)
523          */
524         if (!oldnet) {
525                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
526                                          &lsrc_ops);
527                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
528                                          &ldst_ops);
529                 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
530                         printk(KERN_ERR
531                                "%s: local device %s is not network capable\n",
532                                DRV_NAME, rdev->net->hport->name);
533                         goto out;
534                 }
535
536                 /* Allocate our net_device structure */
537                 ndev = alloc_etherdev(sizeof(struct rionet_private));
538                 if (ndev == NULL) {
539                         rc = -ENOMEM;
540                         goto out;
541                 }
542                 nets[netid].ndev = ndev;
543                 rc = rionet_setup_netdev(rdev->net->hport, ndev);
544                 INIT_LIST_HEAD(&nets[netid].peers);
545                 nets[netid].nact = 0;
546         } else if (nets[netid].ndev == NULL)
547                 goto out;
548
549         /*
550          * If the remote device has mailbox/doorbell capabilities,
551          * add it to the peer list.
552          */
553         if (dev_rionet_capable(rdev)) {
554                 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
555                         rc = -ENOMEM;
556                         goto out;
557                 }
558                 peer->rdev = rdev;
559                 list_add_tail(&peer->node, &nets[netid].peers);
560         }
561
562         rio_set_drvdata(rdev, nets[netid].ndev);
563
564       out:
565         return rc;
566 }
567
568 static struct rio_device_id rionet_id_table[] = {
569         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
570 };
571
572 static struct rio_driver rionet_driver = {
573         .name = "rionet",
574         .id_table = rionet_id_table,
575         .probe = rionet_probe,
576         .remove = rionet_remove,
577 };
578
579 static int __init rionet_init(void)
580 {
581         return rio_register_driver(&rionet_driver);
582 }
583
584 static void __exit rionet_exit(void)
585 {
586         rio_unregister_driver(&rionet_driver);
587 }
588
589 late_initcall(rionet_init);
590 module_exit(rionet_exit);