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1 | /* | |
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 | ||
42 | void xenvif_get(struct xenvif *vif) | |
43 | { | |
44 | atomic_inc(&vif->refcnt); | |
45 | } | |
46 | ||
47 | void xenvif_put(struct xenvif *vif) | |
48 | { | |
49 | if (atomic_dec_and_test(&vif->refcnt)) | |
50 | wake_up(&vif->waiting_to_free); | |
51 | } | |
52 | ||
53 | int xenvif_schedulable(struct xenvif *vif) | |
54 | { | |
55 | return netif_running(vif->dev) && netif_carrier_ok(vif->dev); | |
56 | } | |
57 | ||
58 | static int xenvif_rx_schedulable(struct xenvif *vif) | |
59 | { | |
60 | return xenvif_schedulable(vif) && !xen_netbk_rx_ring_full(vif); | |
61 | } | |
62 | ||
63 | static 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 | ||
78 | static 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 | ||
108 | void xenvif_receive_skb(struct xenvif *vif, struct sk_buff *skb) | |
109 | { | |
110 | netif_rx_ni(skb); | |
111 | } | |
112 | ||
113 | void 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 | ||
119 | static 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 | ||
125 | static 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 | ||
132 | static 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 | ||
139 | static 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 | ||
148 | static 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 | ||
157 | static 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 | ||
168 | static void xenvif_set_features(struct xenvif *vif) | |
169 | { | |
170 | struct net_device *dev = vif->dev; | |
171 | u32 features = dev->features; | |
172 | ||
173 | 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; | |
179 | ||
180 | features &= ~(vif->features_disabled); | |
181 | ||
182 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) | |
183 | dev->mtu = ETH_DATA_LEN; | |
184 | ||
185 | dev->features = features; | |
186 | } | |
187 | ||
188 | static int xenvif_set_tx_csum(struct net_device *dev, u32 data) | |
189 | { | |
190 | struct xenvif *vif = netdev_priv(dev); | |
191 | if (data) { | |
192 | if (!vif->csum) | |
193 | return -EOPNOTSUPP; | |
194 | vif->features_disabled &= ~NETIF_F_IP_CSUM; | |
195 | } else { | |
196 | vif->features_disabled |= NETIF_F_IP_CSUM; | |
197 | } | |
198 | ||
199 | xenvif_set_features(vif); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static int xenvif_set_sg(struct net_device *dev, u32 data) | |
204 | { | |
205 | struct xenvif *vif = netdev_priv(dev); | |
206 | if (data) { | |
207 | if (!vif->can_sg) | |
208 | return -EOPNOTSUPP; | |
209 | vif->features_disabled &= ~NETIF_F_SG; | |
210 | } else { | |
211 | vif->features_disabled |= NETIF_F_SG; | |
212 | } | |
213 | ||
214 | xenvif_set_features(vif); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static int xenvif_set_tso(struct net_device *dev, u32 data) | |
219 | { | |
220 | struct xenvif *vif = netdev_priv(dev); | |
221 | if (data) { | |
222 | if (!vif->gso && !vif->gso_prefix) | |
223 | return -EOPNOTSUPP; | |
224 | vif->features_disabled &= ~NETIF_F_TSO; | |
225 | } else { | |
226 | vif->features_disabled |= NETIF_F_TSO; | |
227 | } | |
228 | ||
229 | xenvif_set_features(vif); | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static const struct xenvif_stat { | |
234 | char name[ETH_GSTRING_LEN]; | |
235 | u16 offset; | |
236 | } xenvif_stats[] = { | |
237 | { | |
238 | "rx_gso_checksum_fixup", | |
239 | offsetof(struct xenvif, rx_gso_checksum_fixup) | |
240 | }, | |
241 | }; | |
242 | ||
243 | static int xenvif_get_sset_count(struct net_device *dev, int string_set) | |
244 | { | |
245 | switch (string_set) { | |
246 | case ETH_SS_STATS: | |
247 | return ARRAY_SIZE(xenvif_stats); | |
248 | default: | |
249 | return -EINVAL; | |
250 | } | |
251 | } | |
252 | ||
253 | static void xenvif_get_ethtool_stats(struct net_device *dev, | |
254 | struct ethtool_stats *stats, u64 * data) | |
255 | { | |
256 | void *vif = netdev_priv(dev); | |
257 | int i; | |
258 | ||
259 | for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) | |
260 | data[i] = *(unsigned long *)(vif + xenvif_stats[i].offset); | |
261 | } | |
262 | ||
263 | static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
264 | { | |
265 | int i; | |
266 | ||
267 | switch (stringset) { | |
268 | case ETH_SS_STATS: | |
269 | for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) | |
270 | memcpy(data + i * ETH_GSTRING_LEN, | |
271 | xenvif_stats[i].name, ETH_GSTRING_LEN); | |
272 | break; | |
273 | } | |
274 | } | |
275 | ||
276 | static struct ethtool_ops xenvif_ethtool_ops = { | |
277 | .get_tx_csum = ethtool_op_get_tx_csum, | |
278 | .set_tx_csum = xenvif_set_tx_csum, | |
279 | .get_sg = ethtool_op_get_sg, | |
280 | .set_sg = xenvif_set_sg, | |
281 | .get_tso = ethtool_op_get_tso, | |
282 | .set_tso = xenvif_set_tso, | |
283 | .get_link = ethtool_op_get_link, | |
284 | ||
285 | .get_sset_count = xenvif_get_sset_count, | |
286 | .get_ethtool_stats = xenvif_get_ethtool_stats, | |
287 | .get_strings = xenvif_get_strings, | |
288 | }; | |
289 | ||
290 | static struct net_device_ops xenvif_netdev_ops = { | |
291 | .ndo_start_xmit = xenvif_start_xmit, | |
292 | .ndo_get_stats = xenvif_get_stats, | |
293 | .ndo_open = xenvif_open, | |
294 | .ndo_stop = xenvif_close, | |
295 | .ndo_change_mtu = xenvif_change_mtu, | |
296 | }; | |
297 | ||
298 | struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, | |
299 | unsigned int handle) | |
300 | { | |
301 | int err; | |
302 | struct net_device *dev; | |
303 | struct xenvif *vif; | |
304 | char name[IFNAMSIZ] = {}; | |
305 | ||
306 | snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle); | |
307 | dev = alloc_netdev(sizeof(struct xenvif), name, ether_setup); | |
308 | if (dev == NULL) { | |
309 | pr_warn("Could not allocate netdev\n"); | |
310 | return ERR_PTR(-ENOMEM); | |
311 | } | |
312 | ||
313 | SET_NETDEV_DEV(dev, parent); | |
314 | ||
315 | vif = netdev_priv(dev); | |
316 | vif->domid = domid; | |
317 | vif->handle = handle; | |
318 | vif->netbk = NULL; | |
319 | vif->can_sg = 1; | |
320 | vif->csum = 1; | |
321 | atomic_set(&vif->refcnt, 1); | |
322 | init_waitqueue_head(&vif->waiting_to_free); | |
323 | vif->dev = dev; | |
324 | INIT_LIST_HEAD(&vif->schedule_list); | |
325 | INIT_LIST_HEAD(&vif->notify_list); | |
326 | ||
327 | vif->credit_bytes = vif->remaining_credit = ~0UL; | |
328 | vif->credit_usec = 0UL; | |
329 | init_timer(&vif->credit_timeout); | |
330 | /* Initialize 'expires' now: it's used to track the credit window. */ | |
331 | vif->credit_timeout.expires = jiffies; | |
332 | ||
333 | dev->netdev_ops = &xenvif_netdev_ops; | |
334 | xenvif_set_features(vif); | |
335 | SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops); | |
336 | ||
337 | dev->tx_queue_len = XENVIF_QUEUE_LENGTH; | |
338 | ||
339 | /* | |
340 | * Initialise a dummy MAC address. We choose the numerically | |
341 | * largest non-broadcast address to prevent the address getting | |
342 | * stolen by an Ethernet bridge for STP purposes. | |
343 | * (FE:FF:FF:FF:FF:FF) | |
344 | */ | |
345 | memset(dev->dev_addr, 0xFF, ETH_ALEN); | |
346 | dev->dev_addr[0] &= ~0x01; | |
347 | ||
348 | netif_carrier_off(dev); | |
349 | ||
350 | err = register_netdev(dev); | |
351 | if (err) { | |
352 | netdev_warn(dev, "Could not register device: err=%d\n", err); | |
353 | free_netdev(dev); | |
354 | return ERR_PTR(err); | |
355 | } | |
356 | ||
357 | netdev_dbg(dev, "Successfully created xenvif\n"); | |
358 | return vif; | |
359 | } | |
360 | ||
361 | int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref, | |
362 | unsigned long rx_ring_ref, unsigned int evtchn) | |
363 | { | |
364 | int err = -ENOMEM; | |
365 | ||
366 | /* Already connected through? */ | |
367 | if (vif->irq) | |
368 | return 0; | |
369 | ||
370 | xenvif_set_features(vif); | |
371 | ||
372 | err = xen_netbk_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref); | |
373 | if (err < 0) | |
374 | goto err; | |
375 | ||
376 | err = bind_interdomain_evtchn_to_irqhandler( | |
377 | vif->domid, evtchn, xenvif_interrupt, 0, | |
378 | vif->dev->name, vif); | |
379 | if (err < 0) | |
380 | goto err_unmap; | |
381 | vif->irq = err; | |
382 | disable_irq(vif->irq); | |
383 | ||
384 | xenvif_get(vif); | |
385 | ||
386 | rtnl_lock(); | |
387 | netif_carrier_on(vif->dev); | |
388 | if (netif_running(vif->dev)) | |
389 | xenvif_up(vif); | |
390 | rtnl_unlock(); | |
391 | ||
392 | return 0; | |
393 | err_unmap: | |
394 | xen_netbk_unmap_frontend_rings(vif); | |
395 | err: | |
396 | return err; | |
397 | } | |
398 | ||
399 | void xenvif_disconnect(struct xenvif *vif) | |
400 | { | |
401 | struct net_device *dev = vif->dev; | |
402 | if (netif_carrier_ok(dev)) { | |
403 | rtnl_lock(); | |
404 | netif_carrier_off(dev); /* discard queued packets */ | |
405 | if (netif_running(dev)) | |
406 | xenvif_down(vif); | |
407 | rtnl_unlock(); | |
408 | xenvif_put(vif); | |
409 | } | |
410 | ||
411 | atomic_dec(&vif->refcnt); | |
412 | wait_event(vif->waiting_to_free, atomic_read(&vif->refcnt) == 0); | |
413 | ||
414 | del_timer_sync(&vif->credit_timeout); | |
415 | ||
416 | if (vif->irq) | |
417 | unbind_from_irqhandler(vif->irq, vif); | |
418 | ||
419 | unregister_netdev(vif->dev); | |
420 | ||
421 | xen_netbk_unmap_frontend_rings(vif); | |
422 | ||
423 | free_netdev(vif->dev); | |
424 | } |