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1// SPDX-License-Identifier: GPL-2.0
2/* ldmvsw.c: Sun4v LDOM Virtual Switch Driver.
3 *
4 * Copyright (C) 2016-2017 Oracle. All rights reserved.
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/delay.h>
10#include <linux/etherdevice.h>
11#include <linux/ethtool.h>
12#include <linux/highmem.h>
13#include <linux/if_vlan.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/mutex.h>
18#include <linux/netdevice.h>
19#include <linux/slab.h>
20#include <linux/types.h>
21
22#if defined(CONFIG_IPV6)
23#include <linux/icmpv6.h>
24#endif
25
26#include <net/ip.h>
27#include <net/icmp.h>
28#include <net/route.h>
29
30#include <asm/vio.h>
31#include <asm/ldc.h>
32
33/* This driver makes use of the common code in sunvnet_common.c */
34#include "sunvnet_common.h"
35
36/* Length of time before we decide the hardware is hung,
37 * and dev->tx_timeout() should be called to fix the problem.
38 */
39#define VSW_TX_TIMEOUT (10 * HZ)
40
41/* Static HW Addr used for the network interfaces representing vsw ports */
42static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
43
44#define DRV_MODULE_NAME "ldmvsw"
45#define DRV_MODULE_VERSION "1.2"
46#define DRV_MODULE_RELDATE "March 4, 2017"
47
48static char version[] =
49 DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
50MODULE_AUTHOR("Oracle");
51MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");
52MODULE_LICENSE("GPL");
53MODULE_VERSION(DRV_MODULE_VERSION);
54
55/* Ordered from largest major to lowest */
56static struct vio_version vsw_versions[] = {
57 { .major = 1, .minor = 8 },
58 { .major = 1, .minor = 7 },
59 { .major = 1, .minor = 6 },
60 { .major = 1, .minor = 0 },
61};
62
63static void vsw_get_drvinfo(struct net_device *dev,
64 struct ethtool_drvinfo *info)
65{
66 strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
67 strscpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
68}
69
70static u32 vsw_get_msglevel(struct net_device *dev)
71{
72 struct vnet_port *port = netdev_priv(dev);
73
74 return port->vp->msg_enable;
75}
76
77static void vsw_set_msglevel(struct net_device *dev, u32 value)
78{
79 struct vnet_port *port = netdev_priv(dev);
80
81 port->vp->msg_enable = value;
82}
83
84static const struct ethtool_ops vsw_ethtool_ops = {
85 .get_drvinfo = vsw_get_drvinfo,
86 .get_msglevel = vsw_get_msglevel,
87 .set_msglevel = vsw_set_msglevel,
88 .get_link = ethtool_op_get_link,
89};
90
91static LIST_HEAD(vnet_list);
92static DEFINE_MUTEX(vnet_list_mutex);
93
94/* func arg to vnet_start_xmit_common() to get the proper tx port */
95static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb,
96 struct net_device *dev)
97{
98 struct vnet_port *port = netdev_priv(dev);
99
100 return port;
101}
102
103static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb,
104 struct net_device *sb_dev)
105{
106 struct vnet_port *port = netdev_priv(dev);
107
108 if (!port)
109 return 0;
110
111 return port->q_index;
112}
113
114/* Wrappers to common functions */
115static netdev_tx_t vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
116{
117 return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
118}
119
120static void vsw_set_rx_mode(struct net_device *dev)
121{
122 struct vnet_port *port = netdev_priv(dev);
123
124 return sunvnet_set_rx_mode_common(dev, port->vp);
125}
126
127int ldmvsw_open(struct net_device *dev)
128{
129 struct vnet_port *port = netdev_priv(dev);
130 struct vio_driver_state *vio = &port->vio;
131
132 /* reset the channel */
133 vio_link_state_change(vio, LDC_EVENT_RESET);
134 vnet_port_reset(port);
135 vio_port_up(vio);
136
137 return 0;
138}
139EXPORT_SYMBOL_GPL(ldmvsw_open);
140
141#ifdef CONFIG_NET_POLL_CONTROLLER
142static void vsw_poll_controller(struct net_device *dev)
143{
144 struct vnet_port *port = netdev_priv(dev);
145
146 return sunvnet_poll_controller_common(dev, port->vp);
147}
148#endif
149
150static const struct net_device_ops vsw_ops = {
151 .ndo_open = ldmvsw_open,
152 .ndo_stop = sunvnet_close_common,
153 .ndo_set_rx_mode = vsw_set_rx_mode,
154 .ndo_set_mac_address = sunvnet_set_mac_addr_common,
155 .ndo_validate_addr = eth_validate_addr,
156 .ndo_tx_timeout = sunvnet_tx_timeout_common,
157 .ndo_start_xmit = vsw_start_xmit,
158 .ndo_select_queue = vsw_select_queue,
159#ifdef CONFIG_NET_POLL_CONTROLLER
160 .ndo_poll_controller = vsw_poll_controller,
161#endif
162};
163
164static const char *local_mac_prop = "local-mac-address";
165static const char *cfg_handle_prop = "cfg-handle";
166
167static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
168 u64 port_node,
169 u64 *handle)
170{
171 struct vnet *vp;
172 struct vnet *iter;
173 const u64 *local_mac = NULL;
174 const u64 *cfghandle = NULL;
175 u64 a;
176
177 /* Get the parent virtual-network-switch macaddr and cfghandle */
178 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
179 u64 target = mdesc_arc_target(hp, a);
180 const char *name;
181
182 name = mdesc_get_property(hp, target, "name", NULL);
183 if (!name || strcmp(name, "virtual-network-switch"))
184 continue;
185
186 local_mac = mdesc_get_property(hp, target,
187 local_mac_prop, NULL);
188 cfghandle = mdesc_get_property(hp, target,
189 cfg_handle_prop, NULL);
190 break;
191 }
192 if (!local_mac || !cfghandle)
193 return ERR_PTR(-ENODEV);
194
195 /* find or create associated vnet */
196 vp = NULL;
197 mutex_lock(&vnet_list_mutex);
198 list_for_each_entry(iter, &vnet_list, list) {
199 if (iter->local_mac == *local_mac) {
200 vp = iter;
201 break;
202 }
203 }
204
205 if (!vp) {
206 vp = kzalloc(sizeof(*vp), GFP_KERNEL);
207 if (unlikely(!vp)) {
208 mutex_unlock(&vnet_list_mutex);
209 return ERR_PTR(-ENOMEM);
210 }
211
212 spin_lock_init(&vp->lock);
213 INIT_LIST_HEAD(&vp->port_list);
214 INIT_LIST_HEAD(&vp->list);
215 vp->local_mac = *local_mac;
216 list_add(&vp->list, &vnet_list);
217 }
218
219 mutex_unlock(&vnet_list_mutex);
220
221 *handle = (u64)*cfghandle;
222
223 return vp;
224}
225
226static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
227 struct vio_dev *vdev,
228 u64 handle,
229 u64 port_id)
230{
231 struct net_device *dev;
232 struct vnet_port *port;
233
234 dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
235 if (!dev)
236 return ERR_PTR(-ENOMEM);
237 dev->needed_headroom = VNET_PACKET_SKIP + 8;
238 dev->needed_tailroom = 8;
239
240 eth_hw_addr_set(dev, hwaddr);
241 ether_addr_copy(dev->perm_addr, dev->dev_addr);
242
243 sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
244
245 dev->netdev_ops = &vsw_ops;
246 dev->ethtool_ops = &vsw_ethtool_ops;
247 dev->watchdog_timeo = VSW_TX_TIMEOUT;
248
249 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
250 dev->features = dev->hw_features;
251
252 /* MTU range: 68 - 65535 */
253 dev->min_mtu = ETH_MIN_MTU;
254 dev->max_mtu = VNET_MAX_MTU;
255
256 SET_NETDEV_DEV(dev, &vdev->dev);
257
258 return dev;
259}
260
261static struct ldc_channel_config vsw_ldc_cfg = {
262 .event = sunvnet_event_common,
263 .mtu = 64,
264 .mode = LDC_MODE_UNRELIABLE,
265};
266
267static struct vio_driver_ops vsw_vio_ops = {
268 .send_attr = sunvnet_send_attr_common,
269 .handle_attr = sunvnet_handle_attr_common,
270 .handshake_complete = sunvnet_handshake_complete_common,
271};
272
273static const char *remote_macaddr_prop = "remote-mac-address";
274static const char *id_prop = "id";
275
276static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
277{
278 struct mdesc_handle *hp;
279 struct vnet_port *port;
280 unsigned long flags;
281 struct vnet *vp;
282 struct net_device *dev;
283 const u64 *rmac;
284 int len, i, err;
285 const u64 *port_id;
286 u64 handle;
287
288 hp = mdesc_grab();
289
290 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
291 err = -ENODEV;
292 if (!rmac) {
293 pr_err("Port lacks %s property\n", remote_macaddr_prop);
294 mdesc_release(hp);
295 return err;
296 }
297
298 port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
299 err = -ENODEV;
300 if (!port_id) {
301 pr_err("Port lacks %s property\n", id_prop);
302 mdesc_release(hp);
303 return err;
304 }
305
306 /* Get (or create) the vnet associated with this port */
307 vp = vsw_get_vnet(hp, vdev->mp, &handle);
308 if (IS_ERR(vp)) {
309 err = PTR_ERR(vp);
310 pr_err("Failed to get vnet for vsw-port\n");
311 mdesc_release(hp);
312 return err;
313 }
314
315 mdesc_release(hp);
316
317 dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
318 if (IS_ERR(dev)) {
319 err = PTR_ERR(dev);
320 pr_err("Failed to alloc netdev for vsw-port\n");
321 return err;
322 }
323
324 port = netdev_priv(dev);
325
326 INIT_LIST_HEAD(&port->list);
327
328 for (i = 0; i < ETH_ALEN; i++)
329 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
330
331 port->vp = vp;
332 port->dev = dev;
333 port->switch_port = 1;
334 port->tso = false; /* no tso in vsw, misbehaves in bridge */
335 port->tsolen = 0;
336
337 /* Mark the port as belonging to ldmvsw which directs the
338 * common code to use the net_device in the vnet_port
339 * rather than the net_device in the vnet (which is used
340 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
341 * macro.
342 */
343 port->vsw = 1;
344
345 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
346 vsw_versions, ARRAY_SIZE(vsw_versions),
347 &vsw_vio_ops, dev->name);
348 if (err)
349 goto err_out_free_dev;
350
351 err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
352 if (err)
353 goto err_out_free_dev;
354
355 dev_set_drvdata(&vdev->dev, port);
356
357 netif_napi_add(dev, &port->napi, sunvnet_poll_common);
358
359 spin_lock_irqsave(&vp->lock, flags);
360 list_add_rcu(&port->list, &vp->port_list);
361 spin_unlock_irqrestore(&vp->lock, flags);
362
363 timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
364
365 err = register_netdev(dev);
366 if (err) {
367 pr_err("Cannot register net device, aborting\n");
368 goto err_out_del_timer;
369 }
370
371 spin_lock_irqsave(&vp->lock, flags);
372 sunvnet_port_add_txq_common(port);
373 spin_unlock_irqrestore(&vp->lock, flags);
374
375 napi_enable(&port->napi);
376 vio_port_up(&port->vio);
377
378 /* assure no carrier until we receive an LDC_EVENT_UP,
379 * even if the vsw config script tries to force us up
380 */
381 netif_carrier_off(dev);
382
383 netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
384
385 pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
386 port->raddr, " switch-port");
387
388 return 0;
389
390err_out_del_timer:
391 del_timer_sync(&port->clean_timer);
392 list_del_rcu(&port->list);
393 synchronize_rcu();
394 netif_napi_del(&port->napi);
395 dev_set_drvdata(&vdev->dev, NULL);
396 vio_ldc_free(&port->vio);
397
398err_out_free_dev:
399 free_netdev(dev);
400 return err;
401}
402
403static void vsw_port_remove(struct vio_dev *vdev)
404{
405 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
406 unsigned long flags;
407
408 if (port) {
409 del_timer_sync(&port->vio.timer);
410 del_timer_sync(&port->clean_timer);
411
412 napi_disable(&port->napi);
413 unregister_netdev(port->dev);
414
415 list_del_rcu(&port->list);
416
417 synchronize_rcu();
418 spin_lock_irqsave(&port->vp->lock, flags);
419 sunvnet_port_rm_txq_common(port);
420 spin_unlock_irqrestore(&port->vp->lock, flags);
421 netif_napi_del(&port->napi);
422 sunvnet_port_free_tx_bufs_common(port);
423 vio_ldc_free(&port->vio);
424
425 dev_set_drvdata(&vdev->dev, NULL);
426
427 free_netdev(port->dev);
428 }
429}
430
431static void vsw_cleanup(void)
432{
433 struct vnet *vp;
434
435 /* just need to free up the vnet list */
436 mutex_lock(&vnet_list_mutex);
437 while (!list_empty(&vnet_list)) {
438 vp = list_first_entry(&vnet_list, struct vnet, list);
439 list_del(&vp->list);
440 /* vio_unregister_driver() should have cleaned up port_list */
441 if (!list_empty(&vp->port_list))
442 pr_err("Ports not removed by VIO subsystem!\n");
443 kfree(vp);
444 }
445 mutex_unlock(&vnet_list_mutex);
446}
447
448static const struct vio_device_id vsw_port_match[] = {
449 {
450 .type = "vsw-port",
451 },
452 {},
453};
454MODULE_DEVICE_TABLE(vio, vsw_port_match);
455
456static struct vio_driver vsw_port_driver = {
457 .id_table = vsw_port_match,
458 .probe = vsw_port_probe,
459 .remove = vsw_port_remove,
460 .name = "vsw_port",
461};
462
463static int __init vsw_init(void)
464{
465 pr_info("%s\n", version);
466 return vio_register_driver(&vsw_port_driver);
467}
468
469static void __exit vsw_exit(void)
470{
471 vio_unregister_driver(&vsw_port_driver);
472 vsw_cleanup();
473}
474
475module_init(vsw_init);
476module_exit(vsw_exit);