1 /* ldmvsw.c: Sun4v LDOM Virtual Switch Driver.
3 * Copyright (C) 2016-2017 Oracle. All rights reserved.
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8 #include <linux/delay.h>
9 #include <linux/etherdevice.h>
10 #include <linux/ethtool.h>
11 #include <linux/highmem.h>
12 #include <linux/if_vlan.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/netdevice.h>
18 #include <linux/slab.h>
19 #include <linux/types.h>
21 #if defined(CONFIG_IPV6)
22 #include <linux/icmpv6.h>
27 #include <net/route.h>
32 /* This driver makes use of the common code in sunvnet_common.c */
33 #include "sunvnet_common.h"
35 /* Length of time before we decide the hardware is hung,
36 * and dev->tx_timeout() should be called to fix the problem.
38 #define VSW_TX_TIMEOUT (10 * HZ)
40 /* Static HW Addr used for the network interfaces representing vsw ports */
41 static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
43 #define DRV_MODULE_NAME "ldmvsw"
44 #define DRV_MODULE_VERSION "1.2"
45 #define DRV_MODULE_RELDATE "March 4, 2017"
47 static char version[] =
48 DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
49 MODULE_AUTHOR("Oracle");
50 MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");
51 MODULE_LICENSE("GPL");
52 MODULE_VERSION(DRV_MODULE_VERSION);
54 /* Ordered from largest major to lowest */
55 static struct vio_version vsw_versions[] = {
56 { .major = 1, .minor = 8 },
57 { .major = 1, .minor = 7 },
58 { .major = 1, .minor = 6 },
59 { .major = 1, .minor = 0 },
62 static void vsw_get_drvinfo(struct net_device *dev,
63 struct ethtool_drvinfo *info)
65 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
66 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
69 static u32 vsw_get_msglevel(struct net_device *dev)
71 struct vnet_port *port = netdev_priv(dev);
73 return port->vp->msg_enable;
76 static void vsw_set_msglevel(struct net_device *dev, u32 value)
78 struct vnet_port *port = netdev_priv(dev);
80 port->vp->msg_enable = value;
83 static const struct ethtool_ops vsw_ethtool_ops = {
84 .get_drvinfo = vsw_get_drvinfo,
85 .get_msglevel = vsw_get_msglevel,
86 .set_msglevel = vsw_set_msglevel,
87 .get_link = ethtool_op_get_link,
90 static LIST_HEAD(vnet_list);
91 static DEFINE_MUTEX(vnet_list_mutex);
93 /* func arg to vnet_start_xmit_common() to get the proper tx port */
94 static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb,
95 struct net_device *dev)
97 struct vnet_port *port = netdev_priv(dev);
102 static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb,
103 void *accel_priv, select_queue_fallback_t fallback)
105 struct vnet_port *port = netdev_priv(dev);
110 return port->q_index;
113 /* Wrappers to common functions */
114 static netdev_tx_t vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
116 return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
119 static void vsw_set_rx_mode(struct net_device *dev)
121 struct vnet_port *port = netdev_priv(dev);
123 return sunvnet_set_rx_mode_common(dev, port->vp);
126 int ldmvsw_open(struct net_device *dev)
128 struct vnet_port *port = netdev_priv(dev);
129 struct vio_driver_state *vio = &port->vio;
131 /* reset the channel */
132 vio_link_state_change(vio, LDC_EVENT_RESET);
133 vnet_port_reset(port);
138 EXPORT_SYMBOL_GPL(ldmvsw_open);
140 #ifdef CONFIG_NET_POLL_CONTROLLER
141 static void vsw_poll_controller(struct net_device *dev)
143 struct vnet_port *port = netdev_priv(dev);
145 return sunvnet_poll_controller_common(dev, port->vp);
149 static 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,
163 static const char *local_mac_prop = "local-mac-address";
164 static const char *cfg_handle_prop = "cfg-handle";
166 static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
172 const u64 *local_mac = NULL;
173 const u64 *cfghandle = NULL;
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);
181 name = mdesc_get_property(hp, target, "name", NULL);
182 if (!name || strcmp(name, "virtual-network-switch"))
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);
191 if (!local_mac || !cfghandle)
192 return ERR_PTR(-ENODEV);
194 /* find or create associated vnet */
196 mutex_lock(&vnet_list_mutex);
197 list_for_each_entry(iter, &vnet_list, list) {
198 if (iter->local_mac == *local_mac) {
205 vp = kzalloc(sizeof(*vp), GFP_KERNEL);
207 mutex_unlock(&vnet_list_mutex);
208 return ERR_PTR(-ENOMEM);
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);
218 mutex_unlock(&vnet_list_mutex);
220 *handle = (u64)*cfghandle;
225 static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
226 struct vio_dev *vdev,
230 struct net_device *dev;
231 struct vnet_port *port;
234 dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
236 return ERR_PTR(-ENOMEM);
237 dev->needed_headroom = VNET_PACKET_SKIP + 8;
238 dev->needed_tailroom = 8;
240 for (i = 0; i < ETH_ALEN; i++) {
241 dev->dev_addr[i] = hwaddr[i];
242 dev->perm_addr[i] = dev->dev_addr[i];
245 sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
247 dev->netdev_ops = &vsw_ops;
248 dev->ethtool_ops = &vsw_ethtool_ops;
249 dev->watchdog_timeo = VSW_TX_TIMEOUT;
251 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
252 dev->features = dev->hw_features;
254 /* MTU range: 68 - 65535 */
255 dev->min_mtu = ETH_MIN_MTU;
256 dev->max_mtu = VNET_MAX_MTU;
258 SET_NETDEV_DEV(dev, &vdev->dev);
263 static struct ldc_channel_config vsw_ldc_cfg = {
264 .event = sunvnet_event_common,
266 .mode = LDC_MODE_UNRELIABLE,
269 static struct vio_driver_ops vsw_vio_ops = {
270 .send_attr = sunvnet_send_attr_common,
271 .handle_attr = sunvnet_handle_attr_common,
272 .handshake_complete = sunvnet_handshake_complete_common,
275 static const char *remote_macaddr_prop = "remote-mac-address";
276 static const char *id_prop = "id";
278 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
280 struct mdesc_handle *hp;
281 struct vnet_port *port;
284 struct net_device *dev;
295 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
298 pr_err("Port lacks %s property\n", remote_macaddr_prop);
303 port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
306 pr_err("Port lacks %s property\n", id_prop);
311 /* Get (or create) the vnet associated with this port */
312 vp = vsw_get_vnet(hp, vdev->mp, &handle);
313 if (unlikely(IS_ERR(vp))) {
315 pr_err("Failed to get vnet for vsw-port\n");
322 dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
325 pr_err("Failed to alloc netdev for vsw-port\n");
329 port = netdev_priv(dev);
331 INIT_LIST_HEAD(&port->list);
333 for (i = 0; i < ETH_ALEN; i++)
334 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
338 port->switch_port = 1;
339 port->tso = false; /* no tso in vsw, misbehaves in bridge */
342 /* Mark the port as belonging to ldmvsw which directs the
343 * the common code to use the net_device in the vnet_port
344 * rather than the net_device in the vnet (which is used
345 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
350 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
351 vsw_versions, ARRAY_SIZE(vsw_versions),
352 &vsw_vio_ops, dev->name);
354 goto err_out_free_dev;
356 err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
358 goto err_out_free_dev;
360 dev_set_drvdata(&vdev->dev, port);
362 netif_napi_add(dev, &port->napi, sunvnet_poll_common,
365 spin_lock_irqsave(&vp->lock, flags);
366 list_add_rcu(&port->list, &vp->port_list);
367 spin_unlock_irqrestore(&vp->lock, flags);
369 setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
370 (unsigned long)port);
372 err = register_netdev(dev);
374 pr_err("Cannot register net device, aborting\n");
375 goto err_out_del_timer;
378 spin_lock_irqsave(&vp->lock, flags);
379 sunvnet_port_add_txq_common(port);
380 spin_unlock_irqrestore(&vp->lock, flags);
382 napi_enable(&port->napi);
383 vio_port_up(&port->vio);
385 /* assure no carrier until we receive an LDC_EVENT_UP,
386 * even if the vsw config script tries to force us up
388 netif_carrier_off(dev);
390 netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
392 pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
393 port->raddr, " switch-port");
398 del_timer_sync(&port->clean_timer);
399 list_del_rcu(&port->list);
401 netif_napi_del(&port->napi);
402 dev_set_drvdata(&vdev->dev, NULL);
403 vio_ldc_free(&port->vio);
410 static int vsw_port_remove(struct vio_dev *vdev)
412 struct vnet_port *port = dev_get_drvdata(&vdev->dev);
416 del_timer_sync(&port->vio.timer);
417 del_timer_sync(&port->clean_timer);
419 napi_disable(&port->napi);
420 unregister_netdev(port->dev);
422 list_del_rcu(&port->list);
425 spin_lock_irqsave(&port->vp->lock, flags);
426 sunvnet_port_rm_txq_common(port);
427 spin_unlock_irqrestore(&port->vp->lock, flags);
428 netif_napi_del(&port->napi);
429 sunvnet_port_free_tx_bufs_common(port);
430 vio_ldc_free(&port->vio);
432 dev_set_drvdata(&vdev->dev, NULL);
434 free_netdev(port->dev);
440 static void vsw_cleanup(void)
444 /* just need to free up the vnet list */
445 mutex_lock(&vnet_list_mutex);
446 while (!list_empty(&vnet_list)) {
447 vp = list_first_entry(&vnet_list, struct vnet, list);
449 /* vio_unregister_driver() should have cleaned up port_list */
450 if (!list_empty(&vp->port_list))
451 pr_err("Ports not removed by VIO subsystem!\n");
454 mutex_unlock(&vnet_list_mutex);
457 static const struct vio_device_id vsw_port_match[] = {
463 MODULE_DEVICE_TABLE(vio, vsw_port_match);
465 static struct vio_driver vsw_port_driver = {
466 .id_table = vsw_port_match,
467 .probe = vsw_port_probe,
468 .remove = vsw_port_remove,
472 static int __init vsw_init(void)
474 pr_info("%s\n", version);
475 return vio_register_driver(&vsw_port_driver);
478 static void __exit vsw_exit(void)
480 vio_unregister_driver(&vsw_port_driver);
484 module_init(vsw_init);
485 module_exit(vsw_exit);