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
127static int 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}
139
140#ifdef CONFIG_NET_POLL_CONTROLLER
141static void vsw_poll_controller(struct net_device *dev)
142{
143	struct vnet_port *port = netdev_priv(dev);
144
145	return sunvnet_poll_controller_common(dev, port->vp);
146}
147#endif
148
149static const struct net_device_ops vsw_ops = {
150	.ndo_open		= ldmvsw_open,
151	.ndo_stop		= sunvnet_close_common,
152	.ndo_set_rx_mode	= vsw_set_rx_mode,
153	.ndo_set_mac_address	= sunvnet_set_mac_addr_common,
154	.ndo_validate_addr	= eth_validate_addr,
155	.ndo_tx_timeout		= sunvnet_tx_timeout_common,
156	.ndo_start_xmit		= vsw_start_xmit,
157	.ndo_select_queue	= vsw_select_queue,
158#ifdef CONFIG_NET_POLL_CONTROLLER
159	.ndo_poll_controller    = vsw_poll_controller,
160#endif
161};
162
163static const char *local_mac_prop = "local-mac-address";
164static const char *cfg_handle_prop = "cfg-handle";
165
166static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
167				 u64 port_node,
168				 u64 *handle)
169{
170	struct vnet *vp;
171	struct vnet *iter;
172	const u64 *local_mac = NULL;
173	const u64 *cfghandle = NULL;
174	u64 a;
175
176	/* Get the parent virtual-network-switch macaddr and cfghandle */
177	mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
178		u64 target = mdesc_arc_target(hp, a);
179		const char *name;
180
181		name = mdesc_get_property(hp, target, "name", NULL);
182		if (!name || strcmp(name, "virtual-network-switch"))
183			continue;
184
185		local_mac = mdesc_get_property(hp, target,
186					       local_mac_prop, NULL);
187		cfghandle = mdesc_get_property(hp, target,
188					       cfg_handle_prop, NULL);
189		break;
190	}
191	if (!local_mac || !cfghandle)
192		return ERR_PTR(-ENODEV);
193
194	/* find or create associated vnet */
195	vp = NULL;
196	mutex_lock(&vnet_list_mutex);
197	list_for_each_entry(iter, &vnet_list, list) {
198		if (iter->local_mac == *local_mac) {
199			vp = iter;
200			break;
201		}
202	}
203
204	if (!vp) {
205		vp = kzalloc(sizeof(*vp), GFP_KERNEL);
206		if (unlikely(!vp)) {
207			mutex_unlock(&vnet_list_mutex);
208			return ERR_PTR(-ENOMEM);
209		}
210
211		spin_lock_init(&vp->lock);
212		INIT_LIST_HEAD(&vp->port_list);
213		INIT_LIST_HEAD(&vp->list);
214		vp->local_mac = *local_mac;
215		list_add(&vp->list, &vnet_list);
216	}
217
218	mutex_unlock(&vnet_list_mutex);
219
220	*handle = (u64)*cfghandle;
221
222	return vp;
223}
224
225static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
226					   struct vio_dev *vdev,
227					   u64 handle,
228					   u64 port_id)
229{
230	struct net_device *dev;
231	struct vnet_port *port;
232
233	dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
234	if (!dev)
235		return ERR_PTR(-ENOMEM);
236	dev->needed_headroom = VNET_PACKET_SKIP + 8;
237	dev->needed_tailroom = 8;
238
239	eth_hw_addr_set(dev, hwaddr);
240	ether_addr_copy(dev->perm_addr, dev->dev_addr);
241
242	sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
243
244	dev->netdev_ops = &vsw_ops;
245	dev->ethtool_ops = &vsw_ethtool_ops;
246	dev->watchdog_timeo = VSW_TX_TIMEOUT;
247
248	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
249	dev->features = dev->hw_features;
250
251	/* MTU range: 68 - 65535 */
252	dev->min_mtu = ETH_MIN_MTU;
253	dev->max_mtu = VNET_MAX_MTU;
254
255	SET_NETDEV_DEV(dev, &vdev->dev);
256
257	return dev;
258}
259
260static struct ldc_channel_config vsw_ldc_cfg = {
261	.event		= sunvnet_event_common,
262	.mtu		= 64,
263	.mode		= LDC_MODE_UNRELIABLE,
264};
265
266static struct vio_driver_ops vsw_vio_ops = {
267	.send_attr		= sunvnet_send_attr_common,
268	.handle_attr		= sunvnet_handle_attr_common,
269	.handshake_complete	= sunvnet_handshake_complete_common,
270};
271
272static const char *remote_macaddr_prop = "remote-mac-address";
273static const char *id_prop = "id";
274
275static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
276{
277	struct mdesc_handle *hp;
278	struct vnet_port *port;
279	unsigned long flags;
280	struct vnet *vp;
281	struct net_device *dev;
282	const u64 *rmac;
283	int len, i, err;
284	const u64 *port_id;
285	u64 handle;
286
287	hp = mdesc_grab();
288
289	if (!hp)
290		return -ENODEV;
291
292	rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
293	err = -ENODEV;
294	if (!rmac) {
295		pr_err("Port lacks %s property\n", remote_macaddr_prop);
296		mdesc_release(hp);
297		return err;
298	}
299
300	port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
301	err = -ENODEV;
302	if (!port_id) {
303		pr_err("Port lacks %s property\n", id_prop);
304		mdesc_release(hp);
305		return err;
306	}
307
308	/* Get (or create) the vnet associated with this port */
309	vp = vsw_get_vnet(hp, vdev->mp, &handle);
310	if (IS_ERR(vp)) {
311		err = PTR_ERR(vp);
312		pr_err("Failed to get vnet for vsw-port\n");
313		mdesc_release(hp);
314		return err;
315	}
316
317	mdesc_release(hp);
318
319	dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
320	if (IS_ERR(dev)) {
321		err = PTR_ERR(dev);
322		pr_err("Failed to alloc netdev for vsw-port\n");
323		return err;
324	}
325
326	port = netdev_priv(dev);
327
328	INIT_LIST_HEAD(&port->list);
329
330	for (i = 0; i < ETH_ALEN; i++)
331		port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
332
333	port->vp = vp;
334	port->dev = dev;
335	port->switch_port = 1;
336	port->tso = false; /* no tso in vsw, misbehaves in bridge */
337	port->tsolen = 0;
338
339	/* Mark the port as belonging to ldmvsw which directs the
340	 * common code to use the net_device in the vnet_port
341	 * rather than the net_device in the vnet (which is used
342	 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
343	 * macro.
344	 */
345	port->vsw = 1;
346
347	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
348			      vsw_versions, ARRAY_SIZE(vsw_versions),
349			      &vsw_vio_ops, dev->name);
350	if (err)
351		goto err_out_free_dev;
352
353	err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
354	if (err)
355		goto err_out_free_dev;
356
357	dev_set_drvdata(&vdev->dev, port);
358
359	netif_napi_add(dev, &port->napi, sunvnet_poll_common);
360
361	spin_lock_irqsave(&vp->lock, flags);
362	list_add_rcu(&port->list, &vp->port_list);
363	spin_unlock_irqrestore(&vp->lock, flags);
364
365	timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
366
367	err = register_netdev(dev);
368	if (err) {
369		pr_err("Cannot register net device, aborting\n");
370		goto err_out_del_timer;
371	}
372
373	spin_lock_irqsave(&vp->lock, flags);
374	sunvnet_port_add_txq_common(port);
375	spin_unlock_irqrestore(&vp->lock, flags);
376
377	napi_enable(&port->napi);
378	vio_port_up(&port->vio);
379
380	/* assure no carrier until we receive an LDC_EVENT_UP,
381	 * even if the vsw config script tries to force us up
382	 */
383	netif_carrier_off(dev);
384
385	netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
386
387	pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
388		port->raddr, " switch-port");
389
390	return 0;
391
392err_out_del_timer:
393	del_timer_sync(&port->clean_timer);
394	list_del_rcu(&port->list);
395	synchronize_rcu();
396	netif_napi_del(&port->napi);
397	dev_set_drvdata(&vdev->dev, NULL);
398	vio_ldc_free(&port->vio);
399
400err_out_free_dev:
401	free_netdev(dev);
402	return err;
403}
404
405static void vsw_port_remove(struct vio_dev *vdev)
406{
407	struct vnet_port *port = dev_get_drvdata(&vdev->dev);
408	unsigned long flags;
409
410	if (port) {
411		del_timer_sync(&port->vio.timer);
412		del_timer_sync(&port->clean_timer);
413
414		napi_disable(&port->napi);
415		unregister_netdev(port->dev);
416
417		list_del_rcu(&port->list);
418
419		synchronize_rcu();
420		spin_lock_irqsave(&port->vp->lock, flags);
421		sunvnet_port_rm_txq_common(port);
422		spin_unlock_irqrestore(&port->vp->lock, flags);
423		netif_napi_del(&port->napi);
424		sunvnet_port_free_tx_bufs_common(port);
425		vio_ldc_free(&port->vio);
426
427		dev_set_drvdata(&vdev->dev, NULL);
428
429		free_netdev(port->dev);
430	}
431}
432
433static void vsw_cleanup(void)
434{
435	struct vnet *vp;
436
437	/* just need to free up the vnet list */
438	mutex_lock(&vnet_list_mutex);
439	while (!list_empty(&vnet_list)) {
440		vp = list_first_entry(&vnet_list, struct vnet, list);
441		list_del(&vp->list);
442		/* vio_unregister_driver() should have cleaned up port_list */
443		if (!list_empty(&vp->port_list))
444			pr_err("Ports not removed by VIO subsystem!\n");
445		kfree(vp);
446	}
447	mutex_unlock(&vnet_list_mutex);
448}
449
450static const struct vio_device_id vsw_port_match[] = {
451	{
452		.type = "vsw-port",
453	},
454	{},
455};
456MODULE_DEVICE_TABLE(vio, vsw_port_match);
457
458static struct vio_driver vsw_port_driver = {
459	.id_table	= vsw_port_match,
460	.probe		= vsw_port_probe,
461	.remove		= vsw_port_remove,
462	.name		= "vsw_port",
463};
464
465static int __init vsw_init(void)
466{
467	pr_info("%s\n", version);
468	return vio_register_driver(&vsw_port_driver);
469}
470
471static void __exit vsw_exit(void)
472{
473	vio_unregister_driver(&vsw_port_driver);
474	vsw_cleanup();
475}
476
477module_init(vsw_init);
478module_exit(vsw_exit);
479