2 * rionet - Ethernet driver over RapidIO messaging services
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
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.
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>
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>
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"
33 MODULE_AUTHOR(DRV_AUTHOR);
34 MODULE_DESCRIPTION(DRV_DESC);
35 MODULE_LICENSE("GPL");
37 #define RIONET_DEFAULT_MSGLEVEL \
43 #define RIONET_DOORBELL_JOIN 0x1000
44 #define RIONET_DOORBELL_LEAVE 0x1001
46 #define RIONET_MAILBOX 0
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
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];
66 struct list_head node;
72 struct net_device *ndev;
73 struct list_head peers;
74 struct rio_dev **active;
75 int nact; /* number of active peers */
78 static struct rionet_net nets[RIONET_MAX_NETS];
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)
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))
91 static int rionet_rx_clean(struct net_device *ndev)
95 struct rionet_private *rnet = netdev_priv(ndev);
101 if (!rnet->rx_skb[i])
104 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
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]);
113 if (error == NET_RX_DROP) {
114 ndev->stats.rx_dropped++;
116 ndev->stats.rx_packets++;
117 ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
120 } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
125 static void rionet_rx_fill(struct net_device *ndev, int end)
128 struct rionet_private *rnet = netdev_priv(ndev);
132 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
134 if (!rnet->rx_skb[i])
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);
144 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
145 struct rio_dev *rdev)
147 struct rionet_private *rnet = netdev_priv(ndev);
149 rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
150 rnet->tx_skb[rnet->tx_slot] = skb;
152 ndev->stats.tx_packets++;
153 ndev->stats.tx_bytes += skb->len;
155 if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
156 netif_stop_queue(ndev);
159 rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
161 if (netif_msg_tx_queued(rnet))
162 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
168 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
171 struct rionet_private *rnet = netdev_priv(ndev);
172 struct ethhdr *eth = (struct ethhdr *)skb->data;
177 spin_lock_irqsave(&rnet->tx_lock, flags);
179 if (is_multicast_ether_addr(eth->h_dest))
180 add_num = nets[rnet->mport->id].nact;
182 if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
183 netif_stop_queue(ndev);
184 spin_unlock_irqrestore(&rnet->tx_lock, flags);
185 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
187 return NETDEV_TX_BUSY;
190 if (is_multicast_ether_addr(eth->h_dest)) {
193 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
195 if (nets[rnet->mport->id].active[i]) {
196 rionet_queue_tx_msg(skb, ndev,
197 nets[rnet->mport->id].active[i]);
199 atomic_inc(&skb->users);
202 } else if (RIONET_MAC_MATCH(eth->h_dest)) {
203 destid = RIONET_GET_DESTID(eth->h_dest);
204 if (nets[rnet->mport->id].active[destid])
205 rionet_queue_tx_msg(skb, ndev,
206 nets[rnet->mport->id].active[destid]);
209 * If the target device was removed from the list of
210 * active peers but we still have TX packets targeting
211 * it just report sending a packet to the target
212 * (without actual packet transfer).
214 dev_kfree_skb_any(skb);
215 ndev->stats.tx_packets++;
216 ndev->stats.tx_bytes += skb->len;
220 spin_unlock_irqrestore(&rnet->tx_lock, flags);
225 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
228 struct net_device *ndev = dev_id;
229 struct rionet_private *rnet = netdev_priv(ndev);
230 struct rionet_peer *peer;
232 if (netif_msg_intr(rnet))
233 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
234 DRV_NAME, sid, tid, info);
235 if (info == RIONET_DOORBELL_JOIN) {
236 if (!nets[rnet->mport->id].active[sid]) {
237 list_for_each_entry(peer,
238 &nets[rnet->mport->id].peers, node) {
239 if (peer->rdev->destid == sid) {
240 nets[rnet->mport->id].active[sid] =
242 nets[rnet->mport->id].nact++;
245 rio_mport_send_doorbell(mport, sid,
246 RIONET_DOORBELL_JOIN);
248 } else if (info == RIONET_DOORBELL_LEAVE) {
249 nets[rnet->mport->id].active[sid] = NULL;
250 nets[rnet->mport->id].nact--;
252 if (netif_msg_intr(rnet))
253 printk(KERN_WARNING "%s: unhandled doorbell\n",
258 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
261 struct net_device *ndev = dev_id;
262 struct rionet_private *rnet = netdev_priv(ndev);
264 if (netif_msg_intr(rnet))
265 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
266 DRV_NAME, mbox, slot);
268 spin_lock(&rnet->lock);
269 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
270 rionet_rx_fill(ndev, n);
271 spin_unlock(&rnet->lock);
274 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
276 struct net_device *ndev = dev_id;
277 struct rionet_private *rnet = netdev_priv(ndev);
279 spin_lock(&rnet->lock);
281 if (netif_msg_intr(rnet))
283 "%s: outbound message event, mbox %d slot %d\n",
284 DRV_NAME, mbox, slot);
286 while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
287 /* dma unmap single */
288 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
289 rnet->tx_skb[rnet->ack_slot] = NULL;
291 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
295 if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
296 netif_wake_queue(ndev);
298 spin_unlock(&rnet->lock);
301 static int rionet_open(struct net_device *ndev)
304 struct rionet_peer *peer, *tmp;
305 struct rionet_private *rnet = netdev_priv(ndev);
307 if (netif_msg_ifup(rnet))
308 printk(KERN_INFO "%s: open\n", DRV_NAME);
310 if ((rc = rio_request_inb_dbell(rnet->mport,
312 RIONET_DOORBELL_JOIN,
313 RIONET_DOORBELL_LEAVE,
314 rionet_dbell_event)) < 0)
317 if ((rc = rio_request_inb_mbox(rnet->mport,
321 rionet_inb_msg_event)) < 0)
324 if ((rc = rio_request_outb_mbox(rnet->mport,
328 rionet_outb_msg_event)) < 0)
331 /* Initialize inbound message ring */
332 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
333 rnet->rx_skb[i] = NULL;
335 rionet_rx_fill(ndev, 0);
341 netif_carrier_on(ndev);
342 netif_start_queue(ndev);
344 list_for_each_entry_safe(peer, tmp,
345 &nets[rnet->mport->id].peers, node) {
346 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
347 RIONET_DOORBELL_JOIN,
348 RIONET_DOORBELL_LEAVE)))
350 printk(KERN_ERR "%s: error requesting doorbells\n",
355 /* Send a join message */
356 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
363 static int rionet_close(struct net_device *ndev)
365 struct rionet_private *rnet = netdev_priv(ndev);
366 struct rionet_peer *peer, *tmp;
369 if (netif_msg_ifup(rnet))
370 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
372 netif_stop_queue(ndev);
373 netif_carrier_off(ndev);
375 for (i = 0; i < RIONET_RX_RING_SIZE; i++)
376 kfree_skb(rnet->rx_skb[i]);
378 list_for_each_entry_safe(peer, tmp,
379 &nets[rnet->mport->id].peers, node) {
380 if (nets[rnet->mport->id].active[peer->rdev->destid]) {
381 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
382 nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
384 rio_release_outb_dbell(peer->rdev, peer->res);
387 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
388 RIONET_DOORBELL_LEAVE);
389 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
390 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
395 static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
397 struct rio_dev *rdev = to_rio_dev(dev);
398 unsigned char netid = rdev->net->hport->id;
399 struct rionet_peer *peer, *tmp;
401 if (dev_rionet_capable(rdev)) {
402 list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
403 if (peer->rdev == rdev) {
404 if (nets[netid].active[rdev->destid]) {
405 nets[netid].active[rdev->destid] = NULL;
409 list_del(&peer->node);
417 static void rionet_get_drvinfo(struct net_device *ndev,
418 struct ethtool_drvinfo *info)
420 struct rionet_private *rnet = netdev_priv(ndev);
422 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
423 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
424 strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
425 strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
428 static u32 rionet_get_msglevel(struct net_device *ndev)
430 struct rionet_private *rnet = netdev_priv(ndev);
432 return rnet->msg_enable;
435 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
437 struct rionet_private *rnet = netdev_priv(ndev);
439 rnet->msg_enable = value;
442 static const struct ethtool_ops rionet_ethtool_ops = {
443 .get_drvinfo = rionet_get_drvinfo,
444 .get_msglevel = rionet_get_msglevel,
445 .set_msglevel = rionet_set_msglevel,
446 .get_link = ethtool_op_get_link,
449 static const struct net_device_ops rionet_netdev_ops = {
450 .ndo_open = rionet_open,
451 .ndo_stop = rionet_close,
452 .ndo_start_xmit = rionet_start_xmit,
453 .ndo_change_mtu = eth_change_mtu,
454 .ndo_validate_addr = eth_validate_addr,
455 .ndo_set_mac_address = eth_mac_addr,
458 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
461 struct rionet_private *rnet;
463 const size_t rionet_active_bytes = sizeof(void *) *
464 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
466 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
467 get_order(rionet_active_bytes));
468 if (!nets[mport->id].active) {
472 memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
474 /* Set up private area */
475 rnet = netdev_priv(ndev);
478 /* Set the default MAC address */
479 device_id = rio_local_get_device_id(mport);
480 ndev->dev_addr[0] = 0x00;
481 ndev->dev_addr[1] = 0x01;
482 ndev->dev_addr[2] = 0x00;
483 ndev->dev_addr[3] = 0x01;
484 ndev->dev_addr[4] = device_id >> 8;
485 ndev->dev_addr[5] = device_id & 0xff;
487 ndev->netdev_ops = &rionet_netdev_ops;
488 ndev->mtu = RIO_MAX_MSG_SIZE - 14;
489 ndev->features = NETIF_F_LLTX;
490 SET_NETDEV_DEV(ndev, &mport->dev);
491 ndev->ethtool_ops = &rionet_ethtool_ops;
493 spin_lock_init(&rnet->lock);
494 spin_lock_init(&rnet->tx_lock);
496 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
498 rc = register_netdev(ndev);
502 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
514 static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
516 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
519 u32 lsrc_ops, ldst_ops;
520 struct rionet_peer *peer;
521 struct net_device *ndev = NULL;
522 struct rio_dev *rdev = to_rio_dev(dev);
523 unsigned char netid = rdev->net->hport->id;
526 if (netid >= RIONET_MAX_NETS)
529 oldnet = test_and_set_bit(netid, net_table);
532 * If first time through this net, make sure local device is rionet
533 * capable and setup netdev (this step will be skipped in later probes
537 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
539 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
541 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
543 "%s: local device %s is not network capable\n",
544 DRV_NAME, rdev->net->hport->name);
548 /* Allocate our net_device structure */
549 ndev = alloc_etherdev(sizeof(struct rionet_private));
554 nets[netid].ndev = ndev;
555 rc = rionet_setup_netdev(rdev->net->hport, ndev);
557 printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
562 INIT_LIST_HEAD(&nets[netid].peers);
563 nets[netid].nact = 0;
564 } else if (nets[netid].ndev == NULL)
568 * If the remote device has mailbox/doorbell capabilities,
569 * add it to the peer list.
571 if (dev_rionet_capable(rdev)) {
572 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
577 list_add_tail(&peer->node, &nets[netid].peers);
586 static struct rio_device_id rionet_id_table[] = {
587 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
588 { 0, } /* terminate list */
591 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
594 static struct subsys_interface rionet_interface = {
596 .subsys = &rio_bus_type,
597 .add_dev = rionet_add_dev,
598 .remove_dev = rionet_remove_dev,
601 static int __init rionet_init(void)
603 return subsys_interface_register(&rionet_interface);
606 static void __exit rionet_exit(void)
608 struct rionet_private *rnet;
609 struct net_device *ndev;
610 struct rionet_peer *peer, *tmp;
613 for (i = 0; i < RIONET_MAX_NETS; i++) {
614 if (nets[i].ndev != NULL) {
616 rnet = netdev_priv(ndev);
617 unregister_netdev(ndev);
619 list_for_each_entry_safe(peer,
620 tmp, &nets[i].peers, node) {
621 list_del(&peer->node);
625 free_pages((unsigned long)nets[i].active,
626 get_order(sizeof(void *) *
627 RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size)));
628 nets[i].active = NULL;
634 subsys_interface_unregister(&rionet_interface);
637 late_initcall(rionet_init);
638 module_exit(rionet_exit);