blob: b7d41f8c338a8372cea8bfe6649386c6a0d8b090 [file] [log] [blame]
Ian Campbellf942dc22011-03-15 00:06:18 +00001/*
2 * Network-device interface management.
3 *
4 * Copyright (c) 2004-2005, Keir Fraser
5 *
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:
11 *
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:
18 *
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
21 *
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
28 * IN THE SOFTWARE.
29 */
30
31#include "common.h"
32
33#include <linux/ethtool.h>
34#include <linux/rtnetlink.h>
35#include <linux/if_vlan.h>
36
37#include <xen/events.h>
38#include <asm/xen/hypercall.h>
39
40#define XENVIF_QUEUE_LENGTH 32
41
42void xenvif_get(struct xenvif *vif)
43{
44 atomic_inc(&vif->refcnt);
45}
46
47void xenvif_put(struct xenvif *vif)
48{
49 if (atomic_dec_and_test(&vif->refcnt))
50 wake_up(&vif->waiting_to_free);
51}
52
53int xenvif_schedulable(struct xenvif *vif)
54{
55 return netif_running(vif->dev) && netif_carrier_ok(vif->dev);
56}
57
58static int xenvif_rx_schedulable(struct xenvif *vif)
59{
60 return xenvif_schedulable(vif) && !xen_netbk_rx_ring_full(vif);
61}
62
63static irqreturn_t xenvif_interrupt(int irq, void *dev_id)
64{
65 struct xenvif *vif = dev_id;
66
67 if (vif->netbk == NULL)
68 return IRQ_NONE;
69
70 xen_netbk_schedule_xenvif(vif);
71
72 if (xenvif_rx_schedulable(vif))
73 netif_wake_queue(vif->dev);
74
75 return IRQ_HANDLED;
76}
77
78static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
79{
80 struct xenvif *vif = netdev_priv(dev);
81
82 BUG_ON(skb->dev != dev);
83
84 if (vif->netbk == NULL)
85 goto drop;
86
87 /* Drop the packet if the target domain has no receive buffers. */
88 if (!xenvif_rx_schedulable(vif))
89 goto drop;
90
91 /* Reserve ring slots for the worst-case number of fragments. */
92 vif->rx_req_cons_peek += xen_netbk_count_skb_slots(vif, skb);
93 xenvif_get(vif);
94
95 if (vif->can_queue && xen_netbk_must_stop_queue(vif))
96 netif_stop_queue(dev);
97
98 xen_netbk_queue_tx_skb(vif, skb);
99
100 return NETDEV_TX_OK;
101
102 drop:
103 vif->dev->stats.tx_dropped++;
104 dev_kfree_skb(skb);
105 return NETDEV_TX_OK;
106}
107
108void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb)
109{
110 netif_rx_ni(skb);
111}
112
113void xenvif_notify_tx_completion(struct xenvif *vif)
114{
115 if (netif_queue_stopped(vif->dev) && xenvif_rx_schedulable(vif))
116 netif_wake_queue(vif->dev);
117}
118
119static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
120{
121 struct xenvif *vif = netdev_priv(dev);
122 return &vif->dev->stats;
123}
124
125static void xenvif_up(struct xenvif *vif)
126{
127 xen_netbk_add_xenvif(vif);
128 enable_irq(vif->irq);
129 xen_netbk_check_rx_xenvif(vif);
130}
131
132static void xenvif_down(struct xenvif *vif)
133{
134 disable_irq(vif->irq);
135 xen_netbk_deschedule_xenvif(vif);
136 xen_netbk_remove_xenvif(vif);
137}
138
139static int xenvif_open(struct net_device *dev)
140{
141 struct xenvif *vif = netdev_priv(dev);
142 if (netif_carrier_ok(dev))
143 xenvif_up(vif);
144 netif_start_queue(dev);
145 return 0;
146}
147
148static int xenvif_close(struct net_device *dev)
149{
150 struct xenvif *vif = netdev_priv(dev);
151 if (netif_carrier_ok(dev))
152 xenvif_down(vif);
153 netif_stop_queue(dev);
154 return 0;
155}
156
157static int xenvif_change_mtu(struct net_device *dev, int mtu)
158{
159 struct xenvif *vif = netdev_priv(dev);
160 int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN;
161
162 if (mtu > max)
163 return -EINVAL;
164 dev->mtu = mtu;
165 return 0;
166}
167
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000168static netdev_features_t xenvif_fix_features(struct net_device *dev,
169 netdev_features_t features)
Ian Campbellf942dc22011-03-15 00:06:18 +0000170{
171 struct xenvif *vif = netdev_priv(dev);
Ian Campbellf942dc22011-03-15 00:06:18 +0000172
Michał Mirosław47103042011-04-19 03:35:06 +0000173 if (!vif->can_sg)
174 features &= ~NETIF_F_SG;
175 if (!vif->gso && !vif->gso_prefix)
176 features &= ~NETIF_F_TSO;
177 if (!vif->csum)
178 features &= ~NETIF_F_IP_CSUM;
Ian Campbellf942dc22011-03-15 00:06:18 +0000179
Michał Mirosław47103042011-04-19 03:35:06 +0000180 return features;
Ian Campbellf942dc22011-03-15 00:06:18 +0000181}
182
183static const struct xenvif_stat {
184 char name[ETH_GSTRING_LEN];
185 u16 offset;
186} xenvif_stats[] = {
187 {
188 "rx_gso_checksum_fixup",
189 offsetof(struct xenvif, rx_gso_checksum_fixup)
190 },
191};
192
193static int xenvif_get_sset_count(struct net_device *dev, int string_set)
194{
195 switch (string_set) {
196 case ETH_SS_STATS:
197 return ARRAY_SIZE(xenvif_stats);
198 default:
199 return -EINVAL;
200 }
201}
202
203static void xenvif_get_ethtool_stats(struct net_device *dev,
204 struct ethtool_stats *stats, u64 * data)
205{
206 void *vif = netdev_priv(dev);
207 int i;
208
209 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
210 data[i] = *(unsigned long *)(vif + xenvif_stats[i].offset);
211}
212
213static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
214{
215 int i;
216
217 switch (stringset) {
218 case ETH_SS_STATS:
219 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
220 memcpy(data + i * ETH_GSTRING_LEN,
221 xenvif_stats[i].name, ETH_GSTRING_LEN);
222 break;
223 }
224}
225
stephen hemminger813abbb2012-01-04 11:56:58 +0000226static const struct ethtool_ops xenvif_ethtool_ops = {
Ian Campbellf942dc22011-03-15 00:06:18 +0000227 .get_link = ethtool_op_get_link,
228
229 .get_sset_count = xenvif_get_sset_count,
230 .get_ethtool_stats = xenvif_get_ethtool_stats,
231 .get_strings = xenvif_get_strings,
232};
233
stephen hemminger813abbb2012-01-04 11:56:58 +0000234static const struct net_device_ops xenvif_netdev_ops = {
Ian Campbellf942dc22011-03-15 00:06:18 +0000235 .ndo_start_xmit = xenvif_start_xmit,
236 .ndo_get_stats = xenvif_get_stats,
237 .ndo_open = xenvif_open,
238 .ndo_stop = xenvif_close,
239 .ndo_change_mtu = xenvif_change_mtu,
Michał Mirosław47103042011-04-19 03:35:06 +0000240 .ndo_fix_features = xenvif_fix_features,
Ian Campbellf942dc22011-03-15 00:06:18 +0000241};
242
243struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
244 unsigned int handle)
245{
246 int err;
247 struct net_device *dev;
248 struct xenvif *vif;
249 char name[IFNAMSIZ] = {};
250
251 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
252 dev = alloc_netdev(sizeof(struct xenvif), name, ether_setup);
253 if (dev == NULL) {
254 pr_warn("Could not allocate netdev\n");
255 return ERR_PTR(-ENOMEM);
256 }
257
258 SET_NETDEV_DEV(dev, parent);
259
260 vif = netdev_priv(dev);
261 vif->domid = domid;
262 vif->handle = handle;
263 vif->netbk = NULL;
264 vif->can_sg = 1;
265 vif->csum = 1;
266 atomic_set(&vif->refcnt, 1);
267 init_waitqueue_head(&vif->waiting_to_free);
268 vif->dev = dev;
269 INIT_LIST_HEAD(&vif->schedule_list);
270 INIT_LIST_HEAD(&vif->notify_list);
271
272 vif->credit_bytes = vif->remaining_credit = ~0UL;
273 vif->credit_usec = 0UL;
274 init_timer(&vif->credit_timeout);
275 /* Initialize 'expires' now: it's used to track the credit window. */
276 vif->credit_timeout.expires = jiffies;
277
278 dev->netdev_ops = &xenvif_netdev_ops;
Michał Mirosław47103042011-04-19 03:35:06 +0000279 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
280 dev->features = dev->hw_features;
Ian Campbellf942dc22011-03-15 00:06:18 +0000281 SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);
282
283 dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
284
285 /*
286 * Initialise a dummy MAC address. We choose the numerically
287 * largest non-broadcast address to prevent the address getting
288 * stolen by an Ethernet bridge for STP purposes.
289 * (FE:FF:FF:FF:FF:FF)
290 */
291 memset(dev->dev_addr, 0xFF, ETH_ALEN);
292 dev->dev_addr[0] &= ~0x01;
293
294 netif_carrier_off(dev);
295
296 err = register_netdev(dev);
297 if (err) {
298 netdev_warn(dev, "Could not register device: err=%d\n", err);
299 free_netdev(dev);
300 return ERR_PTR(err);
301 }
302
303 netdev_dbg(dev, "Successfully created xenvif\n");
304 return vif;
305}
306
307int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
308 unsigned long rx_ring_ref, unsigned int evtchn)
309{
310 int err = -ENOMEM;
311
312 /* Already connected through? */
313 if (vif->irq)
314 return 0;
315
Ian Campbellf942dc22011-03-15 00:06:18 +0000316 err = xen_netbk_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
317 if (err < 0)
318 goto err;
319
320 err = bind_interdomain_evtchn_to_irqhandler(
321 vif->domid, evtchn, xenvif_interrupt, 0,
322 vif->dev->name, vif);
323 if (err < 0)
324 goto err_unmap;
325 vif->irq = err;
326 disable_irq(vif->irq);
327
328 xenvif_get(vif);
329
330 rtnl_lock();
Michał Mirosław47103042011-04-19 03:35:06 +0000331 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
332 dev_set_mtu(vif->dev, ETH_DATA_LEN);
333 netdev_update_features(vif->dev);
334 netif_carrier_on(vif->dev);
David Vrabeld0e5d832011-09-30 06:37:51 +0000335 if (netif_running(vif->dev))
336 xenvif_up(vif);
Ian Campbellf942dc22011-03-15 00:06:18 +0000337 rtnl_unlock();
338
339 return 0;
340err_unmap:
341 xen_netbk_unmap_frontend_rings(vif);
342err:
343 return err;
344}
345
346void xenvif_disconnect(struct xenvif *vif)
347{
348 struct net_device *dev = vif->dev;
349 if (netif_carrier_ok(dev)) {
350 rtnl_lock();
351 netif_carrier_off(dev); /* discard queued packets */
352 if (netif_running(dev))
353 xenvif_down(vif);
354 rtnl_unlock();
355 xenvif_put(vif);
356 }
357
358 atomic_dec(&vif->refcnt);
359 wait_event(vif->waiting_to_free, atomic_read(&vif->refcnt) == 0);
360
361 del_timer_sync(&vif->credit_timeout);
362
363 if (vif->irq)
364 unbind_from_irqhandler(vif->irq, vif);
365
366 unregister_netdev(vif->dev);
367
368 xen_netbk_unmap_frontend_rings(vif);
369
370 free_netdev(vif->dev);
371}