Root/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
32MODULE_AUTHOR(DRV_AUTHOR);
33MODULE_DESCRIPTION(DRV_DESC);
34MODULE_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
50static LIST_HEAD(rionet_peers);
51
52struct 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
65struct rionet_peer {
66    struct list_head node;
67    struct rio_dev *rdev;
68    struct resource *res;
69};
70
71static int rionet_check = 0;
72static 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 */
80static 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
93static int rionet_rx_clean(struct net_device *ndev)
94{
95    int i;
96    int error = 0;
97    struct rionet_private *rnet = netdev_priv(ndev);
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
132static void rionet_rx_fill(struct net_device *ndev, int end)
133{
134    int i;
135    struct rionet_private *rnet = netdev_priv(ndev);
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
151static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
152                   struct rio_dev *rdev)
153{
154    struct rionet_private *rnet = netdev_priv(ndev);
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
175static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
176{
177    int i;
178    struct rionet_private *rnet = netdev_priv(ndev);
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
214static 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 = netdev_priv(ndev);
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
242static 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 = netdev_priv(ndev);
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
258static 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 = netdev_priv(ndev);
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
285static 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 = netdev_priv(ndev);
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
352static int rionet_close(struct net_device *ndev)
353{
354    struct rionet_private *rnet = netdev_priv(ndev);
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        kfree_skb(rnet->rx_skb[i]);
366
367    list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
368        if (rionet_active[peer->rdev->destid]) {
369            rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
370            rionet_active[peer->rdev->destid] = NULL;
371        }
372        rio_release_outb_dbell(peer->rdev, peer->res);
373    }
374
375    rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
376                  RIONET_DOORBELL_LEAVE);
377    rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
378    rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
379
380    return 0;
381}
382
383static void rionet_remove(struct rio_dev *rdev)
384{
385    struct net_device *ndev = NULL;
386    struct rionet_peer *peer, *tmp;
387
388    free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
389                    __ilog2(sizeof(void *)) + 4 : 0);
390    unregister_netdev(ndev);
391    kfree(ndev);
392
393    list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
394        list_del(&peer->node);
395        kfree(peer);
396    }
397}
398
399static void rionet_get_drvinfo(struct net_device *ndev,
400                   struct ethtool_drvinfo *info)
401{
402    struct rionet_private *rnet = netdev_priv(ndev);
403
404    strcpy(info->driver, DRV_NAME);
405    strcpy(info->version, DRV_VERSION);
406    strcpy(info->fw_version, "n/a");
407    strcpy(info->bus_info, rnet->mport->name);
408}
409
410static u32 rionet_get_msglevel(struct net_device *ndev)
411{
412    struct rionet_private *rnet = netdev_priv(ndev);
413
414    return rnet->msg_enable;
415}
416
417static void rionet_set_msglevel(struct net_device *ndev, u32 value)
418{
419    struct rionet_private *rnet = netdev_priv(ndev);
420
421    rnet->msg_enable = value;
422}
423
424static const struct ethtool_ops rionet_ethtool_ops = {
425    .get_drvinfo = rionet_get_drvinfo,
426    .get_msglevel = rionet_get_msglevel,
427    .set_msglevel = rionet_set_msglevel,
428    .get_link = ethtool_op_get_link,
429};
430
431static const struct net_device_ops rionet_netdev_ops = {
432    .ndo_open = rionet_open,
433    .ndo_stop = rionet_close,
434    .ndo_start_xmit = rionet_start_xmit,
435    .ndo_change_mtu = eth_change_mtu,
436    .ndo_validate_addr = eth_validate_addr,
437    .ndo_set_mac_address = eth_mac_addr,
438};
439
440static int rionet_setup_netdev(struct rio_mport *mport)
441{
442    int rc = 0;
443    struct net_device *ndev = NULL;
444    struct rionet_private *rnet;
445    u16 device_id;
446
447    /* Allocate our net_device structure */
448    ndev = alloc_etherdev(sizeof(struct rionet_private));
449    if (ndev == NULL) {
450        printk(KERN_INFO "%s: could not allocate ethernet device.\n",
451               DRV_NAME);
452        rc = -ENOMEM;
453        goto out;
454    }
455
456    rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
457            mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
458    if (!rionet_active) {
459        rc = -ENOMEM;
460        goto out;
461    }
462    memset((void *)rionet_active, 0, sizeof(void *) *
463                RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
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("%s: %s %s Version %s, MAC %pM\n",
493           ndev->name,
494           DRV_NAME,
495           DRV_DESC,
496           DRV_VERSION,
497           ndev->dev_addr);
498
499      out:
500    return rc;
501}
502
503/*
504 * XXX Make multi-net safe
505 */
506static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
507{
508    int rc = -ENODEV;
509    u32 lpef, lsrc_ops, ldst_ops;
510    struct rionet_peer *peer;
511
512    /* If local device is not rionet capable, give up quickly */
513    if (!rionet_capable)
514        goto out;
515
516    /*
517     * First time through, make sure local device is rionet
518     * capable, setup netdev, and set flags so this is skipped
519     * on later probes
520     */
521    if (!rionet_check) {
522        rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
523        rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
524                     &lsrc_ops);
525        rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
526                     &ldst_ops);
527        if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
528            printk(KERN_ERR
529                   "%s: local device is not network capable\n",
530                   DRV_NAME);
531            rionet_check = 1;
532            rionet_capable = 0;
533            goto out;
534        }
535
536        rc = rionet_setup_netdev(rdev->net->hport);
537        rionet_check = 1;
538    }
539
540    /*
541     * If the remote device has mailbox/doorbell capabilities,
542     * add it to the peer list.
543     */
544    if (dev_rionet_capable(rdev)) {
545        if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
546            rc = -ENOMEM;
547            goto out;
548        }
549        peer->rdev = rdev;
550        list_add_tail(&peer->node, &rionet_peers);
551    }
552
553      out:
554    return rc;
555}
556
557static struct rio_device_id rionet_id_table[] = {
558    {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
559};
560
561static struct rio_driver rionet_driver = {
562    .name = "rionet",
563    .id_table = rionet_id_table,
564    .probe = rionet_probe,
565    .remove = rionet_remove,
566};
567
568static int __init rionet_init(void)
569{
570    return rio_register_driver(&rionet_driver);
571}
572
573static void __exit rionet_exit(void)
574{
575    rio_unregister_driver(&rionet_driver);
576}
577
578module_init(rionet_init);
579module_exit(rionet_exit);
580

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od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7



interactive