2 * Network-device interface management.
4 * Copyright (c) 2004-2005, Keir Fraser
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation; or, when distributed
9 * separately from the Linux kernel or incorporated into other
10 * software packages, subject to the following license:
12 * Permission is hereby granted, free of charge, to any person obtaining a copy
13 * of this source file (the "Software"), to deal in the Software without
14 * restriction, including without limitation the rights to use, copy, modify,
15 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
16 * and to permit persons to whom the Software is furnished to do so, subject to
17 * the following conditions:
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
25 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
33 #include <linux/ethtool.h>
34 #include <linux/rtnetlink.h>
35 #include <linux/if_vlan.h>
37 #include <xen/events.h>
38 #include <asm/xen/hypercall.h>
40 #define XENVIF_QUEUE_LENGTH 32
42 void xenvif_get(struct xenvif *vif)
44 atomic_inc(&vif->refcnt);
47 void xenvif_put(struct xenvif *vif)
49 if (atomic_dec_and_test(&vif->refcnt))
50 wake_up(&vif->waiting_to_free);
53 int xenvif_schedulable(struct xenvif *vif)
55 return netif_running(vif->dev) && netif_carrier_ok(vif->dev);
58 static int xenvif_rx_schedulable(struct xenvif *vif)
60 return xenvif_schedulable(vif) && !xen_netbk_rx_ring_full(vif);
63 static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
65 struct xenvif *vif = dev_id;
67 if (vif->netbk == NULL)
70 xen_netbk_schedule_xenvif(vif);
75 static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id)
77 struct xenvif *vif = dev_id;
79 if (vif->netbk == NULL)
82 if (xenvif_rx_schedulable(vif))
83 netif_wake_queue(vif->dev);
88 static irqreturn_t xenvif_interrupt(int irq, void *dev_id)
90 xenvif_tx_interrupt(irq, dev_id);
91 xenvif_rx_interrupt(irq, dev_id);
96 static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
98 struct xenvif *vif = netdev_priv(dev);
100 BUG_ON(skb->dev != dev);
102 if (vif->netbk == NULL)
105 /* Drop the packet if the target domain has no receive buffers. */
106 if (!xenvif_rx_schedulable(vif))
109 /* Reserve ring slots for the worst-case number of fragments. */
110 vif->rx_req_cons_peek += xen_netbk_count_skb_slots(vif, skb);
113 if (vif->can_queue && xen_netbk_must_stop_queue(vif))
114 netif_stop_queue(dev);
116 xen_netbk_queue_tx_skb(vif, skb);
121 vif->dev->stats.tx_dropped++;
126 void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb)
131 void xenvif_notify_tx_completion(struct xenvif *vif)
133 if (netif_queue_stopped(vif->dev) && xenvif_rx_schedulable(vif))
134 netif_wake_queue(vif->dev);
137 static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
139 struct xenvif *vif = netdev_priv(dev);
140 return &vif->dev->stats;
143 static void xenvif_up(struct xenvif *vif)
145 xen_netbk_add_xenvif(vif);
146 enable_irq(vif->tx_irq);
147 if (vif->tx_irq != vif->rx_irq)
148 enable_irq(vif->rx_irq);
149 xen_netbk_check_rx_xenvif(vif);
152 static void xenvif_down(struct xenvif *vif)
154 disable_irq(vif->tx_irq);
155 if (vif->tx_irq != vif->rx_irq)
156 disable_irq(vif->rx_irq);
157 del_timer_sync(&vif->credit_timeout);
158 xen_netbk_deschedule_xenvif(vif);
159 xen_netbk_remove_xenvif(vif);
162 static int xenvif_open(struct net_device *dev)
164 struct xenvif *vif = netdev_priv(dev);
165 if (netif_carrier_ok(dev))
167 netif_start_queue(dev);
171 static int xenvif_close(struct net_device *dev)
173 struct xenvif *vif = netdev_priv(dev);
174 if (netif_carrier_ok(dev))
176 netif_stop_queue(dev);
180 static int xenvif_change_mtu(struct net_device *dev, int mtu)
182 struct xenvif *vif = netdev_priv(dev);
183 int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN;
191 static netdev_features_t xenvif_fix_features(struct net_device *dev,
192 netdev_features_t features)
194 struct xenvif *vif = netdev_priv(dev);
197 features &= ~NETIF_F_SG;
198 if (!vif->gso && !vif->gso_prefix)
199 features &= ~NETIF_F_TSO;
201 features &= ~NETIF_F_IP_CSUM;
206 static const struct xenvif_stat {
207 char name[ETH_GSTRING_LEN];
211 "rx_gso_checksum_fixup",
212 offsetof(struct xenvif, rx_gso_checksum_fixup)
216 static int xenvif_get_sset_count(struct net_device *dev, int string_set)
218 switch (string_set) {
220 return ARRAY_SIZE(xenvif_stats);
226 static void xenvif_get_ethtool_stats(struct net_device *dev,
227 struct ethtool_stats *stats, u64 * data)
229 void *vif = netdev_priv(dev);
232 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
233 data[i] = *(unsigned long *)(vif + xenvif_stats[i].offset);
236 static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
242 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
243 memcpy(data + i * ETH_GSTRING_LEN,
244 xenvif_stats[i].name, ETH_GSTRING_LEN);
249 static const struct ethtool_ops xenvif_ethtool_ops = {
250 .get_link = ethtool_op_get_link,
252 .get_sset_count = xenvif_get_sset_count,
253 .get_ethtool_stats = xenvif_get_ethtool_stats,
254 .get_strings = xenvif_get_strings,
257 static const struct net_device_ops xenvif_netdev_ops = {
258 .ndo_start_xmit = xenvif_start_xmit,
259 .ndo_get_stats = xenvif_get_stats,
260 .ndo_open = xenvif_open,
261 .ndo_stop = xenvif_close,
262 .ndo_change_mtu = xenvif_change_mtu,
263 .ndo_fix_features = xenvif_fix_features,
264 .ndo_set_mac_address = eth_mac_addr,
265 .ndo_validate_addr = eth_validate_addr,
268 struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
272 struct net_device *dev;
274 char name[IFNAMSIZ] = {};
276 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
277 dev = alloc_netdev(sizeof(struct xenvif), name, ether_setup);
279 pr_warn("Could not allocate netdev\n");
280 return ERR_PTR(-ENOMEM);
283 SET_NETDEV_DEV(dev, parent);
285 vif = netdev_priv(dev);
287 vif->handle = handle;
291 atomic_set(&vif->refcnt, 1);
292 init_waitqueue_head(&vif->waiting_to_free);
294 INIT_LIST_HEAD(&vif->schedule_list);
295 INIT_LIST_HEAD(&vif->notify_list);
297 vif->credit_bytes = vif->remaining_credit = ~0UL;
298 vif->credit_usec = 0UL;
299 init_timer(&vif->credit_timeout);
300 /* Initialize 'expires' now: it's used to track the credit window. */
301 vif->credit_timeout.expires = jiffies;
303 dev->netdev_ops = &xenvif_netdev_ops;
304 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
305 dev->features = dev->hw_features;
306 SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);
308 dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
311 * Initialise a dummy MAC address. We choose the numerically
312 * largest non-broadcast address to prevent the address getting
313 * stolen by an Ethernet bridge for STP purposes.
314 * (FE:FF:FF:FF:FF:FF)
316 memset(dev->dev_addr, 0xFF, ETH_ALEN);
317 dev->dev_addr[0] &= ~0x01;
319 netif_carrier_off(dev);
321 err = register_netdev(dev);
323 netdev_warn(dev, "Could not register device: err=%d\n", err);
328 netdev_dbg(dev, "Successfully created xenvif\n");
332 int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
333 unsigned long rx_ring_ref, unsigned int tx_evtchn,
334 unsigned int rx_evtchn)
338 /* Already connected through? */
342 __module_get(THIS_MODULE);
344 err = xen_netbk_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
348 if (tx_evtchn == rx_evtchn) {
349 /* feature-split-event-channels == 0 */
350 err = bind_interdomain_evtchn_to_irqhandler(
351 vif->domid, tx_evtchn, xenvif_interrupt, 0,
352 vif->dev->name, vif);
355 vif->tx_irq = vif->rx_irq = err;
356 disable_irq(vif->tx_irq);
358 /* feature-split-event-channels == 1 */
359 snprintf(vif->tx_irq_name, sizeof(vif->tx_irq_name),
360 "%s-tx", vif->dev->name);
361 err = bind_interdomain_evtchn_to_irqhandler(
362 vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
363 vif->tx_irq_name, vif);
367 disable_irq(vif->tx_irq);
369 snprintf(vif->rx_irq_name, sizeof(vif->rx_irq_name),
370 "%s-rx", vif->dev->name);
371 err = bind_interdomain_evtchn_to_irqhandler(
372 vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
373 vif->rx_irq_name, vif);
377 disable_irq(vif->rx_irq);
383 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
384 dev_set_mtu(vif->dev, ETH_DATA_LEN);
385 netdev_update_features(vif->dev);
386 netif_carrier_on(vif->dev);
387 if (netif_running(vif->dev))
393 unbind_from_irqhandler(vif->tx_irq, vif);
396 xen_netbk_unmap_frontend_rings(vif);
398 module_put(THIS_MODULE);
402 void xenvif_carrier_off(struct xenvif *vif)
404 struct net_device *dev = vif->dev;
407 netif_carrier_off(dev); /* discard queued packets */
408 if (netif_running(dev))
414 void xenvif_disconnect(struct xenvif *vif)
416 /* Disconnect funtion might get called by generic framework
417 * even before vif connects, so we need to check if we really
418 * need to do a module_put.
420 int need_module_put = 0;
422 if (netif_carrier_ok(vif->dev))
423 xenvif_carrier_off(vif);
425 atomic_dec(&vif->refcnt);
426 wait_event(vif->waiting_to_free, atomic_read(&vif->refcnt) == 0);
429 if (vif->tx_irq == vif->rx_irq)
430 unbind_from_irqhandler(vif->tx_irq, vif);
432 unbind_from_irqhandler(vif->tx_irq, vif);
433 unbind_from_irqhandler(vif->rx_irq, vif);
435 /* vif->irq is valid, we had a module_get in
441 unregister_netdev(vif->dev);
443 xen_netbk_unmap_frontend_rings(vif);
445 free_netdev(vif->dev);
448 module_put(THIS_MODULE);