1 // SPDX-License-Identifier: GPL-2.0
2 /* sunvnet.c: Sun LDOM Virtual Network Driver.
3 *
4 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
5 * Copyright (C) 2016-2017 Oracle. All rights reserved.
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/slab.h>
14 #include <linux/delay.h>
15 #include <linux/init.h>
16 #include <linux/netdevice.h>
17 #include <linux/ethtool.h>
18 #include <linux/etherdevice.h>
19 #include <linux/mutex.h>
20 #include <linux/highmem.h>
21 #include <linux/if_vlan.h>
22
23 #if IS_ENABLED(CONFIG_IPV6)
24 #include <linux/icmpv6.h>
25 #endif
26
27 #include <net/ip.h>
28 #include <net/icmp.h>
29 #include <net/route.h>
30
31 #include <asm/vio.h>
32 #include <asm/ldc.h>
33
34 #include "sunvnet_common.h"
35
36 /* length of time before we decide the hardware is borked,
37 * and dev->tx_timeout() should be called to fix the problem
38 */
39 #define VNET_TX_TIMEOUT (5 * HZ)
40
41 #define DRV_MODULE_NAME "sunvnet"
42 #define DRV_MODULE_VERSION "2.0"
43 #define DRV_MODULE_RELDATE "February 3, 2017"
44
45 static char version[] =
46 DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
47 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
48 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
49 MODULE_LICENSE("GPL");
50 MODULE_VERSION(DRV_MODULE_VERSION);
51
52 /* Ordered from largest major to lowest */
53 static struct vio_version vnet_versions[] = {
54 { .major = 1, .minor = 8 },
55 { .major = 1, .minor = 7 },
56 { .major = 1, .minor = 6 },
57 { .major = 1, .minor = 0 },
58 };
59
vnet_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)60 static void vnet_get_drvinfo(struct net_device *dev,
61 struct ethtool_drvinfo *info)
62 {
63 strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
64 strscpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
65 }
66
vnet_get_msglevel(struct net_device * dev)67 static u32 vnet_get_msglevel(struct net_device *dev)
68 {
69 struct vnet *vp = netdev_priv(dev);
70
71 return vp->msg_enable;
72 }
73
vnet_set_msglevel(struct net_device * dev,u32 value)74 static void vnet_set_msglevel(struct net_device *dev, u32 value)
75 {
76 struct vnet *vp = netdev_priv(dev);
77
78 vp->msg_enable = value;
79 }
80
81 static const struct {
82 const char string[ETH_GSTRING_LEN];
83 } ethtool_stats_keys[] = {
84 { "rx_packets" },
85 { "tx_packets" },
86 { "rx_bytes" },
87 { "tx_bytes" },
88 { "rx_errors" },
89 { "tx_errors" },
90 { "rx_dropped" },
91 { "tx_dropped" },
92 { "multicast" },
93 { "rx_length_errors" },
94 { "rx_frame_errors" },
95 { "rx_missed_errors" },
96 { "tx_carrier_errors" },
97 { "nports" },
98 };
99
vnet_get_sset_count(struct net_device * dev,int sset)100 static int vnet_get_sset_count(struct net_device *dev, int sset)
101 {
102 struct vnet *vp = (struct vnet *)netdev_priv(dev);
103
104 switch (sset) {
105 case ETH_SS_STATS:
106 return ARRAY_SIZE(ethtool_stats_keys)
107 + (NUM_VNET_PORT_STATS * vp->nports);
108 default:
109 return -EOPNOTSUPP;
110 }
111 }
112
vnet_get_strings(struct net_device * dev,u32 stringset,u8 * buf)113 static void vnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
114 {
115 struct vnet *vp = (struct vnet *)netdev_priv(dev);
116 struct vnet_port *port;
117 char *p = (char *)buf;
118
119 switch (stringset) {
120 case ETH_SS_STATS:
121 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
122 p += sizeof(ethtool_stats_keys);
123
124 rcu_read_lock();
125 list_for_each_entry_rcu(port, &vp->port_list, list) {
126 snprintf(p, ETH_GSTRING_LEN, "p%u.%s-%pM",
127 port->q_index, port->switch_port ? "s" : "q",
128 port->raddr);
129 p += ETH_GSTRING_LEN;
130 snprintf(p, ETH_GSTRING_LEN, "p%u.rx_packets",
131 port->q_index);
132 p += ETH_GSTRING_LEN;
133 snprintf(p, ETH_GSTRING_LEN, "p%u.tx_packets",
134 port->q_index);
135 p += ETH_GSTRING_LEN;
136 snprintf(p, ETH_GSTRING_LEN, "p%u.rx_bytes",
137 port->q_index);
138 p += ETH_GSTRING_LEN;
139 snprintf(p, ETH_GSTRING_LEN, "p%u.tx_bytes",
140 port->q_index);
141 p += ETH_GSTRING_LEN;
142 snprintf(p, ETH_GSTRING_LEN, "p%u.event_up",
143 port->q_index);
144 p += ETH_GSTRING_LEN;
145 snprintf(p, ETH_GSTRING_LEN, "p%u.event_reset",
146 port->q_index);
147 p += ETH_GSTRING_LEN;
148 }
149 rcu_read_unlock();
150 break;
151 default:
152 WARN_ON(1);
153 break;
154 }
155 }
156
vnet_get_ethtool_stats(struct net_device * dev,struct ethtool_stats * estats,u64 * data)157 static void vnet_get_ethtool_stats(struct net_device *dev,
158 struct ethtool_stats *estats, u64 *data)
159 {
160 struct vnet *vp = (struct vnet *)netdev_priv(dev);
161 struct vnet_port *port;
162 int i = 0;
163
164 data[i++] = dev->stats.rx_packets;
165 data[i++] = dev->stats.tx_packets;
166 data[i++] = dev->stats.rx_bytes;
167 data[i++] = dev->stats.tx_bytes;
168 data[i++] = dev->stats.rx_errors;
169 data[i++] = dev->stats.tx_errors;
170 data[i++] = dev->stats.rx_dropped;
171 data[i++] = dev->stats.tx_dropped;
172 data[i++] = dev->stats.multicast;
173 data[i++] = dev->stats.rx_length_errors;
174 data[i++] = dev->stats.rx_frame_errors;
175 data[i++] = dev->stats.rx_missed_errors;
176 data[i++] = dev->stats.tx_carrier_errors;
177 data[i++] = vp->nports;
178
179 rcu_read_lock();
180 list_for_each_entry_rcu(port, &vp->port_list, list) {
181 data[i++] = port->q_index;
182 data[i++] = port->stats.rx_packets;
183 data[i++] = port->stats.tx_packets;
184 data[i++] = port->stats.rx_bytes;
185 data[i++] = port->stats.tx_bytes;
186 data[i++] = port->stats.event_up;
187 data[i++] = port->stats.event_reset;
188 }
189 rcu_read_unlock();
190 }
191
192 static const struct ethtool_ops vnet_ethtool_ops = {
193 .get_drvinfo = vnet_get_drvinfo,
194 .get_msglevel = vnet_get_msglevel,
195 .set_msglevel = vnet_set_msglevel,
196 .get_link = ethtool_op_get_link,
197 .get_sset_count = vnet_get_sset_count,
198 .get_strings = vnet_get_strings,
199 .get_ethtool_stats = vnet_get_ethtool_stats,
200 };
201
202 static LIST_HEAD(vnet_list);
203 static DEFINE_MUTEX(vnet_list_mutex);
204
__tx_port_find(struct vnet * vp,struct sk_buff * skb)205 static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
206 {
207 unsigned int hash = vnet_hashfn(skb->data);
208 struct hlist_head *hp = &vp->port_hash[hash];
209 struct vnet_port *port;
210
211 hlist_for_each_entry_rcu(port, hp, hash) {
212 if (!sunvnet_port_is_up_common(port))
213 continue;
214 if (ether_addr_equal(port->raddr, skb->data))
215 return port;
216 }
217 list_for_each_entry_rcu(port, &vp->port_list, list) {
218 if (!port->switch_port)
219 continue;
220 if (!sunvnet_port_is_up_common(port))
221 continue;
222 return port;
223 }
224 return NULL;
225 }
226
227 /* func arg to vnet_start_xmit_common() to get the proper tx port */
vnet_tx_port_find(struct sk_buff * skb,struct net_device * dev)228 static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb,
229 struct net_device *dev)
230 {
231 struct vnet *vp = netdev_priv(dev);
232
233 return __tx_port_find(vp, skb);
234 }
235
vnet_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)236 static u16 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
237 struct net_device *sb_dev)
238 {
239 struct vnet *vp = netdev_priv(dev);
240 struct vnet_port *port = __tx_port_find(vp, skb);
241
242 if (!port)
243 return 0;
244
245 return port->q_index;
246 }
247
248 /* Wrappers to common functions */
vnet_start_xmit(struct sk_buff * skb,struct net_device * dev)249 static netdev_tx_t vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
250 {
251 return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find);
252 }
253
vnet_set_rx_mode(struct net_device * dev)254 static void vnet_set_rx_mode(struct net_device *dev)
255 {
256 struct vnet *vp = netdev_priv(dev);
257
258 return sunvnet_set_rx_mode_common(dev, vp);
259 }
260
261 #ifdef CONFIG_NET_POLL_CONTROLLER
vnet_poll_controller(struct net_device * dev)262 static void vnet_poll_controller(struct net_device *dev)
263 {
264 struct vnet *vp = netdev_priv(dev);
265
266 return sunvnet_poll_controller_common(dev, vp);
267 }
268 #endif
269
270 static const struct net_device_ops vnet_ops = {
271 .ndo_open = sunvnet_open_common,
272 .ndo_stop = sunvnet_close_common,
273 .ndo_set_rx_mode = vnet_set_rx_mode,
274 .ndo_set_mac_address = sunvnet_set_mac_addr_common,
275 .ndo_validate_addr = eth_validate_addr,
276 .ndo_tx_timeout = sunvnet_tx_timeout_common,
277 .ndo_start_xmit = vnet_start_xmit,
278 .ndo_select_queue = vnet_select_queue,
279 #ifdef CONFIG_NET_POLL_CONTROLLER
280 .ndo_poll_controller = vnet_poll_controller,
281 #endif
282 };
283
vnet_new(const u64 * local_mac,struct vio_dev * vdev)284 static struct vnet *vnet_new(const u64 *local_mac,
285 struct vio_dev *vdev)
286 {
287 struct net_device *dev;
288 u8 addr[ETH_ALEN];
289 struct vnet *vp;
290 int err, i;
291
292 dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
293 if (!dev)
294 return ERR_PTR(-ENOMEM);
295 dev->needed_headroom = VNET_PACKET_SKIP + 8;
296 dev->needed_tailroom = 8;
297
298 for (i = 0; i < ETH_ALEN; i++)
299 addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
300 eth_hw_addr_set(dev, addr);
301
302 vp = netdev_priv(dev);
303
304 spin_lock_init(&vp->lock);
305 vp->dev = dev;
306
307 INIT_LIST_HEAD(&vp->port_list);
308 for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
309 INIT_HLIST_HEAD(&vp->port_hash[i]);
310 INIT_LIST_HEAD(&vp->list);
311 vp->local_mac = *local_mac;
312
313 dev->netdev_ops = &vnet_ops;
314 dev->ethtool_ops = &vnet_ethtool_ops;
315 dev->watchdog_timeo = VNET_TX_TIMEOUT;
316
317 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_ALL_TSO |
318 NETIF_F_HW_CSUM | NETIF_F_SG;
319 dev->features = dev->hw_features;
320
321 /* MTU range: 68 - 65535 */
322 dev->min_mtu = ETH_MIN_MTU;
323 dev->max_mtu = VNET_MAX_MTU;
324
325 SET_NETDEV_DEV(dev, &vdev->dev);
326
327 err = register_netdev(dev);
328 if (err) {
329 pr_err("Cannot register net device, aborting\n");
330 goto err_out_free_dev;
331 }
332
333 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
334
335 list_add(&vp->list, &vnet_list);
336
337 return vp;
338
339 err_out_free_dev:
340 free_netdev(dev);
341
342 return ERR_PTR(err);
343 }
344
vnet_find_or_create(const u64 * local_mac,struct vio_dev * vdev)345 static struct vnet *vnet_find_or_create(const u64 *local_mac,
346 struct vio_dev *vdev)
347 {
348 struct vnet *iter, *vp;
349
350 mutex_lock(&vnet_list_mutex);
351 vp = NULL;
352 list_for_each_entry(iter, &vnet_list, list) {
353 if (iter->local_mac == *local_mac) {
354 vp = iter;
355 break;
356 }
357 }
358 if (!vp)
359 vp = vnet_new(local_mac, vdev);
360 mutex_unlock(&vnet_list_mutex);
361
362 return vp;
363 }
364
vnet_cleanup(void)365 static void vnet_cleanup(void)
366 {
367 struct vnet *vp;
368 struct net_device *dev;
369
370 mutex_lock(&vnet_list_mutex);
371 while (!list_empty(&vnet_list)) {
372 vp = list_first_entry(&vnet_list, struct vnet, list);
373 list_del(&vp->list);
374 dev = vp->dev;
375 /* vio_unregister_driver() should have cleaned up port_list */
376 BUG_ON(!list_empty(&vp->port_list));
377 unregister_netdev(dev);
378 free_netdev(dev);
379 }
380 mutex_unlock(&vnet_list_mutex);
381 }
382
383 static const char *local_mac_prop = "local-mac-address";
384
vnet_find_parent(struct mdesc_handle * hp,u64 port_node,struct vio_dev * vdev)385 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
386 u64 port_node,
387 struct vio_dev *vdev)
388 {
389 const u64 *local_mac = NULL;
390 u64 a;
391
392 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
393 u64 target = mdesc_arc_target(hp, a);
394 const char *name;
395
396 name = mdesc_get_property(hp, target, "name", NULL);
397 if (!name || strcmp(name, "network"))
398 continue;
399
400 local_mac = mdesc_get_property(hp, target,
401 local_mac_prop, NULL);
402 if (local_mac)
403 break;
404 }
405 if (!local_mac)
406 return ERR_PTR(-ENODEV);
407
408 return vnet_find_or_create(local_mac, vdev);
409 }
410
411 static struct ldc_channel_config vnet_ldc_cfg = {
412 .event = sunvnet_event_common,
413 .mtu = 64,
414 .mode = LDC_MODE_UNRELIABLE,
415 };
416
417 static struct vio_driver_ops vnet_vio_ops = {
418 .send_attr = sunvnet_send_attr_common,
419 .handle_attr = sunvnet_handle_attr_common,
420 .handshake_complete = sunvnet_handshake_complete_common,
421 };
422
423 const char *remote_macaddr_prop = "remote-mac-address";
424
vnet_port_probe(struct vio_dev * vdev,const struct vio_device_id * id)425 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
426 {
427 struct mdesc_handle *hp;
428 struct vnet_port *port;
429 unsigned long flags;
430 struct vnet *vp;
431 const u64 *rmac;
432 int len, i, err, switch_port;
433
434 hp = mdesc_grab();
435
436 if (!hp)
437 return -ENODEV;
438
439 vp = vnet_find_parent(hp, vdev->mp, vdev);
440 if (IS_ERR(vp)) {
441 pr_err("Cannot find port parent vnet\n");
442 err = PTR_ERR(vp);
443 goto err_out_put_mdesc;
444 }
445
446 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
447 err = -ENODEV;
448 if (!rmac) {
449 pr_err("Port lacks %s property\n", remote_macaddr_prop);
450 goto err_out_put_mdesc;
451 }
452
453 port = kzalloc(sizeof(*port), GFP_KERNEL);
454 err = -ENOMEM;
455 if (!port)
456 goto err_out_put_mdesc;
457
458 for (i = 0; i < ETH_ALEN; i++)
459 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
460
461 port->vp = vp;
462
463 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
464 vnet_versions, ARRAY_SIZE(vnet_versions),
465 &vnet_vio_ops, vp->dev->name);
466 if (err)
467 goto err_out_free_port;
468
469 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
470 if (err)
471 goto err_out_free_port;
472
473 netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common);
474
475 INIT_HLIST_NODE(&port->hash);
476 INIT_LIST_HEAD(&port->list);
477
478 switch_port = 0;
479 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL))
480 switch_port = 1;
481 port->switch_port = switch_port;
482 port->tso = true;
483 port->tsolen = 0;
484
485 spin_lock_irqsave(&vp->lock, flags);
486 if (switch_port)
487 list_add_rcu(&port->list, &vp->port_list);
488 else
489 list_add_tail_rcu(&port->list, &vp->port_list);
490 hlist_add_head_rcu(&port->hash,
491 &vp->port_hash[vnet_hashfn(port->raddr)]);
492 sunvnet_port_add_txq_common(port);
493 spin_unlock_irqrestore(&vp->lock, flags);
494
495 dev_set_drvdata(&vdev->dev, port);
496
497 pr_info("%s: PORT ( remote-mac %pM%s )\n",
498 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
499
500 timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
501
502 napi_enable(&port->napi);
503 vio_port_up(&port->vio);
504
505 mdesc_release(hp);
506
507 return 0;
508
509 err_out_free_port:
510 kfree(port);
511
512 err_out_put_mdesc:
513 mdesc_release(hp);
514 return err;
515 }
516
vnet_port_remove(struct vio_dev * vdev)517 static void vnet_port_remove(struct vio_dev *vdev)
518 {
519 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
520
521 if (port) {
522 del_timer_sync(&port->vio.timer);
523
524 napi_disable(&port->napi);
525
526 list_del_rcu(&port->list);
527 hlist_del_rcu(&port->hash);
528
529 synchronize_rcu();
530 timer_shutdown_sync(&port->clean_timer);
531 sunvnet_port_rm_txq_common(port);
532 netif_napi_del(&port->napi);
533 sunvnet_port_free_tx_bufs_common(port);
534 vio_ldc_free(&port->vio);
535
536 dev_set_drvdata(&vdev->dev, NULL);
537
538 kfree(port);
539 }
540 }
541
542 static const struct vio_device_id vnet_port_match[] = {
543 {
544 .type = "vnet-port",
545 },
546 {},
547 };
548 MODULE_DEVICE_TABLE(vio, vnet_port_match);
549
550 static struct vio_driver vnet_port_driver = {
551 .id_table = vnet_port_match,
552 .probe = vnet_port_probe,
553 .remove = vnet_port_remove,
554 .name = "vnet_port",
555 };
556
vnet_init(void)557 static int __init vnet_init(void)
558 {
559 pr_info("%s\n", version);
560 return vio_register_driver(&vnet_port_driver);
561 }
562
vnet_exit(void)563 static void __exit vnet_exit(void)
564 {
565 vio_unregister_driver(&vnet_port_driver);
566 vnet_cleanup();
567 }
568
569 module_init(vnet_init);
570 module_exit(vnet_exit);
571