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f942dc25 IC |
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 | ||
b3f980bd | 33 | #include <linux/kthread.h> |
f942dc25 IC |
34 | #include <linux/ethtool.h> |
35 | #include <linux/rtnetlink.h> | |
36 | #include <linux/if_vlan.h> | |
f35f76ee | 37 | #include <linux/vmalloc.h> |
f942dc25 IC |
38 | |
39 | #include <xen/events.h> | |
40 | #include <asm/xen/hypercall.h> | |
f53c3fe8 | 41 | #include <xen/balloon.h> |
f942dc25 IC |
42 | |
43 | #define XENVIF_QUEUE_LENGTH 32 | |
b3f980bd | 44 | #define XENVIF_NAPI_WEIGHT 64 |
f942dc25 IC |
45 | |
46 | int xenvif_schedulable(struct xenvif *vif) | |
47 | { | |
48 | return netif_running(vif->dev) && netif_carrier_ok(vif->dev); | |
49 | } | |
50 | ||
e1f00a69 | 51 | static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id) |
f942dc25 IC |
52 | { |
53 | struct xenvif *vif = dev_id; | |
54 | ||
b3f980bd WL |
55 | if (RING_HAS_UNCONSUMED_REQUESTS(&vif->tx)) |
56 | napi_schedule(&vif->napi); | |
f942dc25 | 57 | |
e1f00a69 WL |
58 | return IRQ_HANDLED; |
59 | } | |
60 | ||
b3f980bd WL |
61 | static int xenvif_poll(struct napi_struct *napi, int budget) |
62 | { | |
63 | struct xenvif *vif = container_of(napi, struct xenvif, napi); | |
64 | int work_done; | |
65 | ||
e9d8b2c2 WL |
66 | /* This vif is rogue, we pretend we've there is nothing to do |
67 | * for this vif to deschedule it from NAPI. But this interface | |
68 | * will be turned off in thread context later. | |
69 | */ | |
70 | if (unlikely(vif->disabled)) { | |
71 | napi_complete(napi); | |
72 | return 0; | |
73 | } | |
74 | ||
7376419a | 75 | work_done = xenvif_tx_action(vif, budget); |
b3f980bd WL |
76 | |
77 | if (work_done < budget) { | |
78 | int more_to_do = 0; | |
79 | unsigned long flags; | |
80 | ||
81 | /* It is necessary to disable IRQ before calling | |
82 | * RING_HAS_UNCONSUMED_REQUESTS. Otherwise we might | |
83 | * lose event from the frontend. | |
84 | * | |
85 | * Consider: | |
86 | * RING_HAS_UNCONSUMED_REQUESTS | |
87 | * <frontend generates event to trigger napi_schedule> | |
88 | * __napi_complete | |
89 | * | |
90 | * This handler is still in scheduled state so the | |
91 | * event has no effect at all. After __napi_complete | |
92 | * this handler is descheduled and cannot get | |
93 | * scheduled again. We lose event in this case and the ring | |
94 | * will be completely stalled. | |
95 | */ | |
96 | ||
97 | local_irq_save(flags); | |
98 | ||
99 | RING_FINAL_CHECK_FOR_REQUESTS(&vif->tx, more_to_do); | |
869b9b19 | 100 | if (!more_to_do) |
b3f980bd WL |
101 | __napi_complete(napi); |
102 | ||
103 | local_irq_restore(flags); | |
104 | } | |
105 | ||
106 | return work_done; | |
107 | } | |
108 | ||
e1f00a69 WL |
109 | static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id) |
110 | { | |
111 | struct xenvif *vif = dev_id; | |
112 | ||
ca2f09f2 | 113 | xenvif_kick_thread(vif); |
f942dc25 IC |
114 | |
115 | return IRQ_HANDLED; | |
116 | } | |
117 | ||
e1f00a69 WL |
118 | static irqreturn_t xenvif_interrupt(int irq, void *dev_id) |
119 | { | |
120 | xenvif_tx_interrupt(irq, dev_id); | |
121 | xenvif_rx_interrupt(irq, dev_id); | |
122 | ||
123 | return IRQ_HANDLED; | |
124 | } | |
125 | ||
09350788 ZK |
126 | static void xenvif_wake_queue(unsigned long data) |
127 | { | |
128 | struct xenvif *vif = (struct xenvif *)data; | |
129 | ||
130 | if (netif_queue_stopped(vif->dev)) { | |
131 | netdev_err(vif->dev, "draining TX queue\n"); | |
132 | vif->rx_queue_purge = true; | |
133 | xenvif_kick_thread(vif); | |
134 | netif_wake_queue(vif->dev); | |
135 | } | |
136 | } | |
137 | ||
f942dc25 IC |
138 | static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev) |
139 | { | |
140 | struct xenvif *vif = netdev_priv(dev); | |
ca2f09f2 | 141 | int min_slots_needed; |
f942dc25 IC |
142 | |
143 | BUG_ON(skb->dev != dev); | |
144 | ||
b3f980bd | 145 | /* Drop the packet if vif is not ready */ |
f53c3fe8 ZK |
146 | if (vif->task == NULL || |
147 | vif->dealloc_task == NULL || | |
148 | !xenvif_schedulable(vif)) | |
f942dc25 IC |
149 | goto drop; |
150 | ||
ca2f09f2 PD |
151 | /* At best we'll need one slot for the header and one for each |
152 | * frag. | |
153 | */ | |
154 | min_slots_needed = 1 + skb_shinfo(skb)->nr_frags; | |
f942dc25 | 155 | |
ca2f09f2 PD |
156 | /* If the skb is GSO then we'll also need an extra slot for the |
157 | * metadata. | |
158 | */ | |
836fbaf4 | 159 | if (skb_is_gso(skb)) |
ca2f09f2 | 160 | min_slots_needed++; |
f942dc25 | 161 | |
ca2f09f2 PD |
162 | /* If the skb can't possibly fit in the remaining slots |
163 | * then turn off the queue to give the ring a chance to | |
164 | * drain. | |
165 | */ | |
09350788 ZK |
166 | if (!xenvif_rx_ring_slots_available(vif, min_slots_needed)) { |
167 | vif->wake_queue.function = xenvif_wake_queue; | |
168 | vif->wake_queue.data = (unsigned long)vif; | |
ca2f09f2 | 169 | xenvif_stop_queue(vif); |
09350788 ZK |
170 | mod_timer(&vif->wake_queue, |
171 | jiffies + rx_drain_timeout_jiffies); | |
172 | } | |
f942dc25 | 173 | |
ca2f09f2 PD |
174 | skb_queue_tail(&vif->rx_queue, skb); |
175 | xenvif_kick_thread(vif); | |
f942dc25 IC |
176 | |
177 | return NETDEV_TX_OK; | |
178 | ||
179 | drop: | |
180 | vif->dev->stats.tx_dropped++; | |
181 | dev_kfree_skb(skb); | |
182 | return NETDEV_TX_OK; | |
183 | } | |
184 | ||
f942dc25 IC |
185 | static struct net_device_stats *xenvif_get_stats(struct net_device *dev) |
186 | { | |
187 | struct xenvif *vif = netdev_priv(dev); | |
188 | return &vif->dev->stats; | |
189 | } | |
190 | ||
191 | static void xenvif_up(struct xenvif *vif) | |
192 | { | |
b3f980bd | 193 | napi_enable(&vif->napi); |
e1f00a69 WL |
194 | enable_irq(vif->tx_irq); |
195 | if (vif->tx_irq != vif->rx_irq) | |
196 | enable_irq(vif->rx_irq); | |
7376419a | 197 | xenvif_check_rx_xenvif(vif); |
f942dc25 IC |
198 | } |
199 | ||
200 | static void xenvif_down(struct xenvif *vif) | |
201 | { | |
b3f980bd | 202 | napi_disable(&vif->napi); |
e1f00a69 WL |
203 | disable_irq(vif->tx_irq); |
204 | if (vif->tx_irq != vif->rx_irq) | |
205 | disable_irq(vif->rx_irq); | |
3e55f8b3 | 206 | del_timer_sync(&vif->credit_timeout); |
f942dc25 IC |
207 | } |
208 | ||
209 | static int xenvif_open(struct net_device *dev) | |
210 | { | |
211 | struct xenvif *vif = netdev_priv(dev); | |
212 | if (netif_carrier_ok(dev)) | |
213 | xenvif_up(vif); | |
214 | netif_start_queue(dev); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static int xenvif_close(struct net_device *dev) | |
219 | { | |
220 | struct xenvif *vif = netdev_priv(dev); | |
221 | if (netif_carrier_ok(dev)) | |
222 | xenvif_down(vif); | |
223 | netif_stop_queue(dev); | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static int xenvif_change_mtu(struct net_device *dev, int mtu) | |
228 | { | |
229 | struct xenvif *vif = netdev_priv(dev); | |
230 | int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN; | |
231 | ||
232 | if (mtu > max) | |
233 | return -EINVAL; | |
234 | dev->mtu = mtu; | |
235 | return 0; | |
236 | } | |
237 | ||
c8f44aff MM |
238 | static netdev_features_t xenvif_fix_features(struct net_device *dev, |
239 | netdev_features_t features) | |
f942dc25 IC |
240 | { |
241 | struct xenvif *vif = netdev_priv(dev); | |
f942dc25 | 242 | |
47103041 MM |
243 | if (!vif->can_sg) |
244 | features &= ~NETIF_F_SG; | |
82cada22 | 245 | if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV4)) |
47103041 | 246 | features &= ~NETIF_F_TSO; |
82cada22 PD |
247 | if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV6)) |
248 | features &= ~NETIF_F_TSO6; | |
146c8a77 | 249 | if (!vif->ip_csum) |
47103041 | 250 | features &= ~NETIF_F_IP_CSUM; |
146c8a77 PD |
251 | if (!vif->ipv6_csum) |
252 | features &= ~NETIF_F_IPV6_CSUM; | |
f942dc25 | 253 | |
47103041 | 254 | return features; |
f942dc25 IC |
255 | } |
256 | ||
257 | static const struct xenvif_stat { | |
258 | char name[ETH_GSTRING_LEN]; | |
259 | u16 offset; | |
260 | } xenvif_stats[] = { | |
261 | { | |
262 | "rx_gso_checksum_fixup", | |
263 | offsetof(struct xenvif, rx_gso_checksum_fixup) | |
264 | }, | |
1bb332af ZK |
265 | /* If (sent != success + fail), there are probably packets never |
266 | * freed up properly! | |
267 | */ | |
268 | { | |
269 | "tx_zerocopy_sent", | |
270 | offsetof(struct xenvif, tx_zerocopy_sent), | |
271 | }, | |
272 | { | |
273 | "tx_zerocopy_success", | |
274 | offsetof(struct xenvif, tx_zerocopy_success), | |
275 | }, | |
276 | { | |
277 | "tx_zerocopy_fail", | |
278 | offsetof(struct xenvif, tx_zerocopy_fail) | |
279 | }, | |
e3377f36 ZK |
280 | /* Number of packets exceeding MAX_SKB_FRAG slots. You should use |
281 | * a guest with the same MAX_SKB_FRAG | |
282 | */ | |
283 | { | |
284 | "tx_frag_overflow", | |
285 | offsetof(struct xenvif, tx_frag_overflow) | |
286 | }, | |
f942dc25 IC |
287 | }; |
288 | ||
289 | static int xenvif_get_sset_count(struct net_device *dev, int string_set) | |
290 | { | |
291 | switch (string_set) { | |
292 | case ETH_SS_STATS: | |
293 | return ARRAY_SIZE(xenvif_stats); | |
294 | default: | |
295 | return -EINVAL; | |
296 | } | |
297 | } | |
298 | ||
299 | static void xenvif_get_ethtool_stats(struct net_device *dev, | |
300 | struct ethtool_stats *stats, u64 * data) | |
301 | { | |
302 | void *vif = netdev_priv(dev); | |
303 | int i; | |
304 | ||
305 | for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) | |
306 | data[i] = *(unsigned long *)(vif + xenvif_stats[i].offset); | |
307 | } | |
308 | ||
309 | static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
310 | { | |
311 | int i; | |
312 | ||
313 | switch (stringset) { | |
314 | case ETH_SS_STATS: | |
315 | for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) | |
316 | memcpy(data + i * ETH_GSTRING_LEN, | |
317 | xenvif_stats[i].name, ETH_GSTRING_LEN); | |
318 | break; | |
319 | } | |
320 | } | |
321 | ||
813abbba | 322 | static const struct ethtool_ops xenvif_ethtool_ops = { |
f942dc25 IC |
323 | .get_link = ethtool_op_get_link, |
324 | ||
325 | .get_sset_count = xenvif_get_sset_count, | |
326 | .get_ethtool_stats = xenvif_get_ethtool_stats, | |
327 | .get_strings = xenvif_get_strings, | |
328 | }; | |
329 | ||
813abbba | 330 | static const struct net_device_ops xenvif_netdev_ops = { |
f942dc25 IC |
331 | .ndo_start_xmit = xenvif_start_xmit, |
332 | .ndo_get_stats = xenvif_get_stats, | |
333 | .ndo_open = xenvif_open, | |
334 | .ndo_stop = xenvif_close, | |
335 | .ndo_change_mtu = xenvif_change_mtu, | |
47103041 | 336 | .ndo_fix_features = xenvif_fix_features, |
4a633a60 MW |
337 | .ndo_set_mac_address = eth_mac_addr, |
338 | .ndo_validate_addr = eth_validate_addr, | |
f942dc25 IC |
339 | }; |
340 | ||
341 | struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, | |
342 | unsigned int handle) | |
343 | { | |
344 | int err; | |
345 | struct net_device *dev; | |
346 | struct xenvif *vif; | |
347 | char name[IFNAMSIZ] = {}; | |
b3f980bd | 348 | int i; |
f942dc25 IC |
349 | |
350 | snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle); | |
351 | dev = alloc_netdev(sizeof(struct xenvif), name, ether_setup); | |
352 | if (dev == NULL) { | |
b3f980bd | 353 | pr_warn("Could not allocate netdev for %s\n", name); |
f942dc25 IC |
354 | return ERR_PTR(-ENOMEM); |
355 | } | |
356 | ||
357 | SET_NETDEV_DEV(dev, parent); | |
358 | ||
359 | vif = netdev_priv(dev); | |
ac3d5ac2 PD |
360 | |
361 | vif->grant_copy_op = vmalloc(sizeof(struct gnttab_copy) * | |
362 | MAX_GRANT_COPY_OPS); | |
363 | if (vif->grant_copy_op == NULL) { | |
364 | pr_warn("Could not allocate grant copy space for %s\n", name); | |
365 | free_netdev(dev); | |
366 | return ERR_PTR(-ENOMEM); | |
367 | } | |
368 | ||
f942dc25 IC |
369 | vif->domid = domid; |
370 | vif->handle = handle; | |
f942dc25 | 371 | vif->can_sg = 1; |
146c8a77 | 372 | vif->ip_csum = 1; |
f942dc25 | 373 | vif->dev = dev; |
f942dc25 | 374 | |
e9d8b2c2 WL |
375 | vif->disabled = false; |
376 | ||
f942dc25 IC |
377 | vif->credit_bytes = vif->remaining_credit = ~0UL; |
378 | vif->credit_usec = 0UL; | |
379 | init_timer(&vif->credit_timeout); | |
059dfa6a | 380 | vif->credit_window_start = get_jiffies_64(); |
f942dc25 | 381 | |
09350788 ZK |
382 | init_timer(&vif->wake_queue); |
383 | ||
f942dc25 | 384 | dev->netdev_ops = &xenvif_netdev_ops; |
146c8a77 PD |
385 | dev->hw_features = NETIF_F_SG | |
386 | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | | |
82cada22 | 387 | NETIF_F_TSO | NETIF_F_TSO6; |
7365bcfa | 388 | dev->features = dev->hw_features | NETIF_F_RXCSUM; |
f942dc25 IC |
389 | SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops); |
390 | ||
391 | dev->tx_queue_len = XENVIF_QUEUE_LENGTH; | |
392 | ||
b3f980bd WL |
393 | skb_queue_head_init(&vif->rx_queue); |
394 | skb_queue_head_init(&vif->tx_queue); | |
395 | ||
396 | vif->pending_cons = 0; | |
397 | vif->pending_prod = MAX_PENDING_REQS; | |
398 | for (i = 0; i < MAX_PENDING_REQS; i++) | |
399 | vif->pending_ring[i] = i; | |
f53c3fe8 ZK |
400 | spin_lock_init(&vif->callback_lock); |
401 | spin_lock_init(&vif->response_lock); | |
402 | /* If ballooning is disabled, this will consume real memory, so you | |
403 | * better enable it. The long term solution would be to use just a | |
404 | * bunch of valid page descriptors, without dependency on ballooning | |
405 | */ | |
406 | err = alloc_xenballooned_pages(MAX_PENDING_REQS, | |
407 | vif->mmap_pages, | |
408 | false); | |
409 | if (err) { | |
410 | netdev_err(dev, "Could not reserve mmap_pages\n"); | |
411 | return ERR_PTR(-ENOMEM); | |
412 | } | |
413 | for (i = 0; i < MAX_PENDING_REQS; i++) { | |
414 | vif->pending_tx_info[i].callback_struct = (struct ubuf_info) | |
415 | { .callback = xenvif_zerocopy_callback, | |
416 | .ctx = NULL, | |
417 | .desc = i }; | |
418 | vif->grant_tx_handle[i] = NETBACK_INVALID_HANDLE; | |
419 | } | |
b3f980bd | 420 | |
f942dc25 IC |
421 | /* |
422 | * Initialise a dummy MAC address. We choose the numerically | |
423 | * largest non-broadcast address to prevent the address getting | |
424 | * stolen by an Ethernet bridge for STP purposes. | |
425 | * (FE:FF:FF:FF:FF:FF) | |
426 | */ | |
427 | memset(dev->dev_addr, 0xFF, ETH_ALEN); | |
428 | dev->dev_addr[0] &= ~0x01; | |
429 | ||
b3f980bd WL |
430 | netif_napi_add(dev, &vif->napi, xenvif_poll, XENVIF_NAPI_WEIGHT); |
431 | ||
f942dc25 IC |
432 | netif_carrier_off(dev); |
433 | ||
434 | err = register_netdev(dev); | |
435 | if (err) { | |
436 | netdev_warn(dev, "Could not register device: err=%d\n", err); | |
437 | free_netdev(dev); | |
438 | return ERR_PTR(err); | |
439 | } | |
440 | ||
441 | netdev_dbg(dev, "Successfully created xenvif\n"); | |
279f438e PD |
442 | |
443 | __module_get(THIS_MODULE); | |
444 | ||
f942dc25 IC |
445 | return vif; |
446 | } | |
447 | ||
448 | int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref, | |
e1f00a69 WL |
449 | unsigned long rx_ring_ref, unsigned int tx_evtchn, |
450 | unsigned int rx_evtchn) | |
f942dc25 | 451 | { |
67fa3660 | 452 | struct task_struct *task; |
f942dc25 IC |
453 | int err = -ENOMEM; |
454 | ||
67fa3660 PD |
455 | BUG_ON(vif->tx_irq); |
456 | BUG_ON(vif->task); | |
f53c3fe8 | 457 | BUG_ON(vif->dealloc_task); |
f942dc25 | 458 | |
7376419a | 459 | err = xenvif_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref); |
f942dc25 IC |
460 | if (err < 0) |
461 | goto err; | |
462 | ||
ca2f09f2 | 463 | init_waitqueue_head(&vif->wq); |
f53c3fe8 | 464 | init_waitqueue_head(&vif->dealloc_wq); |
ca2f09f2 | 465 | |
e1f00a69 WL |
466 | if (tx_evtchn == rx_evtchn) { |
467 | /* feature-split-event-channels == 0 */ | |
468 | err = bind_interdomain_evtchn_to_irqhandler( | |
469 | vif->domid, tx_evtchn, xenvif_interrupt, 0, | |
470 | vif->dev->name, vif); | |
471 | if (err < 0) | |
472 | goto err_unmap; | |
473 | vif->tx_irq = vif->rx_irq = err; | |
474 | disable_irq(vif->tx_irq); | |
475 | } else { | |
476 | /* feature-split-event-channels == 1 */ | |
477 | snprintf(vif->tx_irq_name, sizeof(vif->tx_irq_name), | |
478 | "%s-tx", vif->dev->name); | |
479 | err = bind_interdomain_evtchn_to_irqhandler( | |
480 | vif->domid, tx_evtchn, xenvif_tx_interrupt, 0, | |
481 | vif->tx_irq_name, vif); | |
482 | if (err < 0) | |
483 | goto err_unmap; | |
484 | vif->tx_irq = err; | |
485 | disable_irq(vif->tx_irq); | |
486 | ||
487 | snprintf(vif->rx_irq_name, sizeof(vif->rx_irq_name), | |
488 | "%s-rx", vif->dev->name); | |
489 | err = bind_interdomain_evtchn_to_irqhandler( | |
490 | vif->domid, rx_evtchn, xenvif_rx_interrupt, 0, | |
491 | vif->rx_irq_name, vif); | |
492 | if (err < 0) | |
493 | goto err_tx_unbind; | |
494 | vif->rx_irq = err; | |
495 | disable_irq(vif->rx_irq); | |
496 | } | |
f942dc25 | 497 | |
121fa4b7 ZK |
498 | task = kthread_create(xenvif_kthread_guest_rx, |
499 | (void *)vif, "%s-guest-rx", vif->dev->name); | |
67fa3660 | 500 | if (IS_ERR(task)) { |
b3f980bd | 501 | pr_warn("Could not allocate kthread for %s\n", vif->dev->name); |
67fa3660 | 502 | err = PTR_ERR(task); |
b3f980bd WL |
503 | goto err_rx_unbind; |
504 | } | |
f942dc25 | 505 | |
67fa3660 PD |
506 | vif->task = task; |
507 | ||
f53c3fe8 ZK |
508 | task = kthread_create(xenvif_dealloc_kthread, |
509 | (void *)vif, "%s-dealloc", vif->dev->name); | |
510 | if (IS_ERR(task)) { | |
511 | pr_warn("Could not allocate kthread for %s\n", vif->dev->name); | |
512 | err = PTR_ERR(task); | |
513 | goto err_rx_unbind; | |
514 | } | |
515 | ||
516 | vif->dealloc_task = task; | |
517 | ||
f942dc25 | 518 | rtnl_lock(); |
47103041 MM |
519 | if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN) |
520 | dev_set_mtu(vif->dev, ETH_DATA_LEN); | |
521 | netdev_update_features(vif->dev); | |
522 | netif_carrier_on(vif->dev); | |
d0e5d832 DV |
523 | if (netif_running(vif->dev)) |
524 | xenvif_up(vif); | |
f942dc25 IC |
525 | rtnl_unlock(); |
526 | ||
b3f980bd | 527 | wake_up_process(vif->task); |
f53c3fe8 | 528 | wake_up_process(vif->dealloc_task); |
b3f980bd | 529 | |
f942dc25 | 530 | return 0; |
b3f980bd WL |
531 | |
532 | err_rx_unbind: | |
533 | unbind_from_irqhandler(vif->rx_irq, vif); | |
534 | vif->rx_irq = 0; | |
e1f00a69 WL |
535 | err_tx_unbind: |
536 | unbind_from_irqhandler(vif->tx_irq, vif); | |
537 | vif->tx_irq = 0; | |
f942dc25 | 538 | err_unmap: |
7376419a | 539 | xenvif_unmap_frontend_rings(vif); |
f942dc25 | 540 | err: |
b103f358 | 541 | module_put(THIS_MODULE); |
f942dc25 IC |
542 | return err; |
543 | } | |
544 | ||
48856286 | 545 | void xenvif_carrier_off(struct xenvif *vif) |
f942dc25 IC |
546 | { |
547 | struct net_device *dev = vif->dev; | |
48856286 IC |
548 | |
549 | rtnl_lock(); | |
550 | netif_carrier_off(dev); /* discard queued packets */ | |
551 | if (netif_running(dev)) | |
552 | xenvif_down(vif); | |
553 | rtnl_unlock(); | |
48856286 IC |
554 | } |
555 | ||
556 | void xenvif_disconnect(struct xenvif *vif) | |
557 | { | |
558 | if (netif_carrier_ok(vif->dev)) | |
559 | xenvif_carrier_off(vif); | |
f942dc25 | 560 | |
67fa3660 | 561 | if (vif->task) { |
09350788 | 562 | del_timer_sync(&vif->wake_queue); |
db739ef3 | 563 | kthread_stop(vif->task); |
67fa3660 PD |
564 | vif->task = NULL; |
565 | } | |
db739ef3 | 566 | |
f53c3fe8 ZK |
567 | if (vif->dealloc_task) { |
568 | kthread_stop(vif->dealloc_task); | |
569 | vif->dealloc_task = NULL; | |
570 | } | |
571 | ||
e1f00a69 WL |
572 | if (vif->tx_irq) { |
573 | if (vif->tx_irq == vif->rx_irq) | |
574 | unbind_from_irqhandler(vif->tx_irq, vif); | |
575 | else { | |
576 | unbind_from_irqhandler(vif->tx_irq, vif); | |
577 | unbind_from_irqhandler(vif->rx_irq, vif); | |
578 | } | |
279f438e | 579 | vif->tx_irq = 0; |
b103f358 | 580 | } |
f942dc25 | 581 | |
279f438e PD |
582 | xenvif_unmap_frontend_rings(vif); |
583 | } | |
584 | ||
585 | void xenvif_free(struct xenvif *vif) | |
586 | { | |
f53c3fe8 | 587 | int i, unmap_timeout = 0; |
0e59a4a5 ZK |
588 | /* Here we want to avoid timeout messages if an skb can be legitimately |
589 | * stuck somewhere else. Realistically this could be an another vif's | |
09350788 ZK |
590 | * internal or QDisc queue. That another vif also has this |
591 | * rx_drain_timeout_msecs timeout, but the timer only ditches the | |
592 | * internal queue. After that, the QDisc queue can put in worst case | |
593 | * XEN_NETIF_RX_RING_SIZE / MAX_SKB_FRAGS skbs into that another vif's | |
594 | * internal queue, so we need several rounds of such timeouts until we | |
595 | * can be sure that no another vif should have skb's from us. We are | |
0e59a4a5 | 596 | * not sending more skb's, so newly stuck packets are not interesting |
09350788 ZK |
597 | * for us here. |
598 | */ | |
599 | unsigned int worst_case_skb_lifetime = (rx_drain_timeout_msecs/1000) * | |
600 | DIV_ROUND_UP(XENVIF_QUEUE_LENGTH, (XEN_NETIF_RX_RING_SIZE / MAX_SKB_FRAGS)); | |
f53c3fe8 ZK |
601 | |
602 | for (i = 0; i < MAX_PENDING_REQS; ++i) { | |
603 | if (vif->grant_tx_handle[i] != NETBACK_INVALID_HANDLE) { | |
604 | unmap_timeout++; | |
605 | schedule_timeout(msecs_to_jiffies(1000)); | |
09350788 | 606 | if (unmap_timeout > worst_case_skb_lifetime && |
f53c3fe8 ZK |
607 | net_ratelimit()) |
608 | netdev_err(vif->dev, | |
609 | "Page still granted! Index: %x\n", | |
610 | i); | |
0e59a4a5 ZK |
611 | /* If there are still unmapped pages, reset the loop to |
612 | * start checking again. We shouldn't exit here until | |
613 | * dealloc thread and NAPI instance release all the | |
614 | * pages. If a kernel bug causes the skbs to stall | |
615 | * somewhere, the interface cannot be brought down | |
616 | * properly. | |
617 | */ | |
f53c3fe8 ZK |
618 | i = -1; |
619 | } | |
620 | } | |
621 | ||
622 | free_xenballooned_pages(MAX_PENDING_REQS, vif->mmap_pages); | |
623 | ||
b3f980bd WL |
624 | netif_napi_del(&vif->napi); |
625 | ||
f942dc25 IC |
626 | unregister_netdev(vif->dev); |
627 | ||
ac3d5ac2 | 628 | vfree(vif->grant_copy_op); |
f942dc25 | 629 | free_netdev(vif->dev); |
b103f358 | 630 | |
279f438e | 631 | module_put(THIS_MODULE); |
f942dc25 | 632 | } |