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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/kthread.h>
34#include <linux/ethtool.h>
35#include <linux/rtnetlink.h>
36#include <linux/if_vlan.h>
37#include <linux/vmalloc.h>
38
39#include <xen/events.h>
40#include <asm/xen/hypercall.h>
41#include <xen/balloon.h>
42
43#define XENVIF_QUEUE_LENGTH 32
44#define XENVIF_NAPI_WEIGHT 64
45
46int xenvif_schedulable(struct xenvif *vif)
47{
48 return netif_running(vif->dev) && netif_carrier_ok(vif->dev);
49}
50
51static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
52{
53 struct xenvif *vif = dev_id;
54
55 if (RING_HAS_UNCONSUMED_REQUESTS(&vif->tx))
56 napi_schedule(&vif->napi);
57
58 return IRQ_HANDLED;
59}
60
61static 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
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
75 work_done = xenvif_tx_action(vif, budget);
76
77 if (work_done < budget) {
78 napi_complete(napi);
79 xenvif_napi_schedule_or_enable_events(vif);
80 }
81
82 return work_done;
83}
84
85static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id)
86{
87 struct xenvif *vif = dev_id;
88
89 xenvif_kick_thread(vif);
90
91 return IRQ_HANDLED;
92}
93
94static irqreturn_t xenvif_interrupt(int irq, void *dev_id)
95{
96 xenvif_tx_interrupt(irq, dev_id);
97 xenvif_rx_interrupt(irq, dev_id);
98
99 return IRQ_HANDLED;
100}
101
102static void xenvif_wake_queue(unsigned long data)
103{
104 struct xenvif *vif = (struct xenvif *)data;
105
106 if (netif_queue_stopped(vif->dev)) {
107 netdev_err(vif->dev, "draining TX queue\n");
108 vif->rx_queue_purge = true;
109 xenvif_kick_thread(vif);
110 netif_wake_queue(vif->dev);
111 }
112}
113
114static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
115{
116 struct xenvif *vif = netdev_priv(dev);
117 int min_slots_needed;
118
119 BUG_ON(skb->dev != dev);
120
121 /* Drop the packet if vif is not ready */
122 if (vif->task == NULL ||
123 vif->dealloc_task == NULL ||
124 !xenvif_schedulable(vif))
125 goto drop;
126
127 /* At best we'll need one slot for the header and one for each
128 * frag.
129 */
130 min_slots_needed = 1 + skb_shinfo(skb)->nr_frags;
131
132 /* If the skb is GSO then we'll also need an extra slot for the
133 * metadata.
134 */
135 if (skb_is_gso(skb))
136 min_slots_needed++;
137
138 /* If the skb can't possibly fit in the remaining slots
139 * then turn off the queue to give the ring a chance to
140 * drain.
141 */
142 if (!xenvif_rx_ring_slots_available(vif, min_slots_needed)) {
143 vif->wake_queue.function = xenvif_wake_queue;
144 vif->wake_queue.data = (unsigned long)vif;
145 xenvif_stop_queue(vif);
146 mod_timer(&vif->wake_queue,
147 jiffies + rx_drain_timeout_jiffies);
148 }
149
150 skb_queue_tail(&vif->rx_queue, skb);
151 xenvif_kick_thread(vif);
152
153 return NETDEV_TX_OK;
154
155 drop:
156 vif->dev->stats.tx_dropped++;
157 dev_kfree_skb(skb);
158 return NETDEV_TX_OK;
159}
160
161static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
162{
163 struct xenvif *vif = netdev_priv(dev);
164 return &vif->dev->stats;
165}
166
167static void xenvif_up(struct xenvif *vif)
168{
169 napi_enable(&vif->napi);
170 enable_irq(vif->tx_irq);
171 if (vif->tx_irq != vif->rx_irq)
172 enable_irq(vif->rx_irq);
173 xenvif_napi_schedule_or_enable_events(vif);
174}
175
176static void xenvif_down(struct xenvif *vif)
177{
178 napi_disable(&vif->napi);
179 disable_irq(vif->tx_irq);
180 if (vif->tx_irq != vif->rx_irq)
181 disable_irq(vif->rx_irq);
182 del_timer_sync(&vif->credit_timeout);
183}
184
185static int xenvif_open(struct net_device *dev)
186{
187 struct xenvif *vif = netdev_priv(dev);
188 if (netif_carrier_ok(dev))
189 xenvif_up(vif);
190 netif_start_queue(dev);
191 return 0;
192}
193
194static int xenvif_close(struct net_device *dev)
195{
196 struct xenvif *vif = netdev_priv(dev);
197 if (netif_carrier_ok(dev))
198 xenvif_down(vif);
199 netif_stop_queue(dev);
200 return 0;
201}
202
203static int xenvif_change_mtu(struct net_device *dev, int mtu)
204{
205 struct xenvif *vif = netdev_priv(dev);
206 int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN;
207
208 if (mtu > max)
209 return -EINVAL;
210 dev->mtu = mtu;
211 return 0;
212}
213
214static netdev_features_t xenvif_fix_features(struct net_device *dev,
215 netdev_features_t features)
216{
217 struct xenvif *vif = netdev_priv(dev);
218
219 if (!vif->can_sg)
220 features &= ~NETIF_F_SG;
221 if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV4))
222 features &= ~NETIF_F_TSO;
223 if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV6))
224 features &= ~NETIF_F_TSO6;
225 if (!vif->ip_csum)
226 features &= ~NETIF_F_IP_CSUM;
227 if (!vif->ipv6_csum)
228 features &= ~NETIF_F_IPV6_CSUM;
229
230 return features;
231}
232
233static 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 /* If (sent != success + fail), there are probably packets never
242 * freed up properly!
243 */
244 {
245 "tx_zerocopy_sent",
246 offsetof(struct xenvif, tx_zerocopy_sent),
247 },
248 {
249 "tx_zerocopy_success",
250 offsetof(struct xenvif, tx_zerocopy_success),
251 },
252 {
253 "tx_zerocopy_fail",
254 offsetof(struct xenvif, tx_zerocopy_fail)
255 },
256 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use
257 * a guest with the same MAX_SKB_FRAG
258 */
259 {
260 "tx_frag_overflow",
261 offsetof(struct xenvif, tx_frag_overflow)
262 },
263};
264
265static int xenvif_get_sset_count(struct net_device *dev, int string_set)
266{
267 switch (string_set) {
268 case ETH_SS_STATS:
269 return ARRAY_SIZE(xenvif_stats);
270 default:
271 return -EINVAL;
272 }
273}
274
275static void xenvif_get_ethtool_stats(struct net_device *dev,
276 struct ethtool_stats *stats, u64 * data)
277{
278 void *vif = netdev_priv(dev);
279 int i;
280
281 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
282 data[i] = *(unsigned long *)(vif + xenvif_stats[i].offset);
283}
284
285static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
286{
287 int i;
288
289 switch (stringset) {
290 case ETH_SS_STATS:
291 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
292 memcpy(data + i * ETH_GSTRING_LEN,
293 xenvif_stats[i].name, ETH_GSTRING_LEN);
294 break;
295 }
296}
297
298static const struct ethtool_ops xenvif_ethtool_ops = {
299 .get_link = ethtool_op_get_link,
300
301 .get_sset_count = xenvif_get_sset_count,
302 .get_ethtool_stats = xenvif_get_ethtool_stats,
303 .get_strings = xenvif_get_strings,
304};
305
306static const struct net_device_ops xenvif_netdev_ops = {
307 .ndo_start_xmit = xenvif_start_xmit,
308 .ndo_get_stats = xenvif_get_stats,
309 .ndo_open = xenvif_open,
310 .ndo_stop = xenvif_close,
311 .ndo_change_mtu = xenvif_change_mtu,
312 .ndo_fix_features = xenvif_fix_features,
313 .ndo_set_mac_address = eth_mac_addr,
314 .ndo_validate_addr = eth_validate_addr,
315};
316
317struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
318 unsigned int handle)
319{
320 int err;
321 struct net_device *dev;
322 struct xenvif *vif;
323 char name[IFNAMSIZ] = {};
324 int i;
325
326 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
327 dev = alloc_netdev(sizeof(struct xenvif), name, ether_setup);
328 if (dev == NULL) {
329 pr_warn("Could not allocate netdev for %s\n", name);
330 return ERR_PTR(-ENOMEM);
331 }
332
333 SET_NETDEV_DEV(dev, parent);
334
335 vif = netdev_priv(dev);
336
337 vif->grant_copy_op = vmalloc(sizeof(struct gnttab_copy) *
338 MAX_GRANT_COPY_OPS);
339 if (vif->grant_copy_op == NULL) {
340 pr_warn("Could not allocate grant copy space for %s\n", name);
341 free_netdev(dev);
342 return ERR_PTR(-ENOMEM);
343 }
344
345 vif->domid = domid;
346 vif->handle = handle;
347 vif->can_sg = 1;
348 vif->ip_csum = 1;
349 vif->dev = dev;
350
351 vif->disabled = false;
352
353 vif->credit_bytes = vif->remaining_credit = ~0UL;
354 vif->credit_usec = 0UL;
355 init_timer(&vif->credit_timeout);
356 vif->credit_window_start = get_jiffies_64();
357
358 init_timer(&vif->wake_queue);
359
360 dev->netdev_ops = &xenvif_netdev_ops;
361 dev->hw_features = NETIF_F_SG |
362 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
363 NETIF_F_TSO | NETIF_F_TSO6;
364 dev->features = dev->hw_features | NETIF_F_RXCSUM;
365 SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);
366
367 dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
368
369 skb_queue_head_init(&vif->rx_queue);
370 skb_queue_head_init(&vif->tx_queue);
371
372 vif->pending_cons = 0;
373 vif->pending_prod = MAX_PENDING_REQS;
374 for (i = 0; i < MAX_PENDING_REQS; i++)
375 vif->pending_ring[i] = i;
376 spin_lock_init(&vif->callback_lock);
377 spin_lock_init(&vif->response_lock);
378 /* If ballooning is disabled, this will consume real memory, so you
379 * better enable it. The long term solution would be to use just a
380 * bunch of valid page descriptors, without dependency on ballooning
381 */
382 err = alloc_xenballooned_pages(MAX_PENDING_REQS,
383 vif->mmap_pages,
384 false);
385 if (err) {
386 netdev_err(dev, "Could not reserve mmap_pages\n");
387 return ERR_PTR(-ENOMEM);
388 }
389 for (i = 0; i < MAX_PENDING_REQS; i++) {
390 vif->pending_tx_info[i].callback_struct = (struct ubuf_info)
391 { .callback = xenvif_zerocopy_callback,
392 .ctx = NULL,
393 .desc = i };
394 vif->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
395 }
396
397 /*
398 * Initialise a dummy MAC address. We choose the numerically
399 * largest non-broadcast address to prevent the address getting
400 * stolen by an Ethernet bridge for STP purposes.
401 * (FE:FF:FF:FF:FF:FF)
402 */
403 memset(dev->dev_addr, 0xFF, ETH_ALEN);
404 dev->dev_addr[0] &= ~0x01;
405
406 netif_napi_add(dev, &vif->napi, xenvif_poll, XENVIF_NAPI_WEIGHT);
407
408 netif_carrier_off(dev);
409
410 err = register_netdev(dev);
411 if (err) {
412 netdev_warn(dev, "Could not register device: err=%d\n", err);
413 free_netdev(dev);
414 return ERR_PTR(err);
415 }
416
417 netdev_dbg(dev, "Successfully created xenvif\n");
418
419 __module_get(THIS_MODULE);
420
421 return vif;
422}
423
424int xenvif_connect(struct xenvif *vif, unsigned long tx_ring_ref,
425 unsigned long rx_ring_ref, unsigned int tx_evtchn,
426 unsigned int rx_evtchn)
427{
428 struct task_struct *task;
429 int err = -ENOMEM;
430
431 BUG_ON(vif->tx_irq);
432 BUG_ON(vif->task);
433 BUG_ON(vif->dealloc_task);
434
435 err = xenvif_map_frontend_rings(vif, tx_ring_ref, rx_ring_ref);
436 if (err < 0)
437 goto err;
438
439 init_waitqueue_head(&vif->wq);
440 init_waitqueue_head(&vif->dealloc_wq);
441
442 if (tx_evtchn == rx_evtchn) {
443 /* feature-split-event-channels == 0 */
444 err = bind_interdomain_evtchn_to_irqhandler(
445 vif->domid, tx_evtchn, xenvif_interrupt, 0,
446 vif->dev->name, vif);
447 if (err < 0)
448 goto err_unmap;
449 vif->tx_irq = vif->rx_irq = err;
450 disable_irq(vif->tx_irq);
451 } else {
452 /* feature-split-event-channels == 1 */
453 snprintf(vif->tx_irq_name, sizeof(vif->tx_irq_name),
454 "%s-tx", vif->dev->name);
455 err = bind_interdomain_evtchn_to_irqhandler(
456 vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
457 vif->tx_irq_name, vif);
458 if (err < 0)
459 goto err_unmap;
460 vif->tx_irq = err;
461 disable_irq(vif->tx_irq);
462
463 snprintf(vif->rx_irq_name, sizeof(vif->rx_irq_name),
464 "%s-rx", vif->dev->name);
465 err = bind_interdomain_evtchn_to_irqhandler(
466 vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
467 vif->rx_irq_name, vif);
468 if (err < 0)
469 goto err_tx_unbind;
470 vif->rx_irq = err;
471 disable_irq(vif->rx_irq);
472 }
473
474 task = kthread_create(xenvif_kthread_guest_rx,
475 (void *)vif, "%s-guest-rx", vif->dev->name);
476 if (IS_ERR(task)) {
477 pr_warn("Could not allocate kthread for %s\n", vif->dev->name);
478 err = PTR_ERR(task);
479 goto err_rx_unbind;
480 }
481
482 vif->task = task;
483
484 task = kthread_create(xenvif_dealloc_kthread,
485 (void *)vif, "%s-dealloc", vif->dev->name);
486 if (IS_ERR(task)) {
487 pr_warn("Could not allocate kthread for %s\n", vif->dev->name);
488 err = PTR_ERR(task);
489 goto err_rx_unbind;
490 }
491
492 vif->dealloc_task = task;
493
494 rtnl_lock();
495 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
496 dev_set_mtu(vif->dev, ETH_DATA_LEN);
497 netdev_update_features(vif->dev);
498 netif_carrier_on(vif->dev);
499 if (netif_running(vif->dev))
500 xenvif_up(vif);
501 rtnl_unlock();
502
503 wake_up_process(vif->task);
504 wake_up_process(vif->dealloc_task);
505
506 return 0;
507
508err_rx_unbind:
509 unbind_from_irqhandler(vif->rx_irq, vif);
510 vif->rx_irq = 0;
511err_tx_unbind:
512 unbind_from_irqhandler(vif->tx_irq, vif);
513 vif->tx_irq = 0;
514err_unmap:
515 xenvif_unmap_frontend_rings(vif);
516err:
517 module_put(THIS_MODULE);
518 return err;
519}
520
521void xenvif_carrier_off(struct xenvif *vif)
522{
523 struct net_device *dev = vif->dev;
524
525 rtnl_lock();
526 netif_carrier_off(dev); /* discard queued packets */
527 if (netif_running(dev))
528 xenvif_down(vif);
529 rtnl_unlock();
530}
531
532void xenvif_disconnect(struct xenvif *vif)
533{
534 if (netif_carrier_ok(vif->dev))
535 xenvif_carrier_off(vif);
536
537 if (vif->task) {
538 del_timer_sync(&vif->wake_queue);
539 kthread_stop(vif->task);
540 vif->task = NULL;
541 }
542
543 if (vif->dealloc_task) {
544 kthread_stop(vif->dealloc_task);
545 vif->dealloc_task = NULL;
546 }
547
548 if (vif->tx_irq) {
549 if (vif->tx_irq == vif->rx_irq)
550 unbind_from_irqhandler(vif->tx_irq, vif);
551 else {
552 unbind_from_irqhandler(vif->tx_irq, vif);
553 unbind_from_irqhandler(vif->rx_irq, vif);
554 }
555 vif->tx_irq = 0;
556 }
557
558 xenvif_unmap_frontend_rings(vif);
559}
560
561void xenvif_free(struct xenvif *vif)
562{
563 int i, unmap_timeout = 0;
564 /* Here we want to avoid timeout messages if an skb can be legitimately
565 * stuck somewhere else. Realistically this could be an another vif's
566 * internal or QDisc queue. That another vif also has this
567 * rx_drain_timeout_msecs timeout, but the timer only ditches the
568 * internal queue. After that, the QDisc queue can put in worst case
569 * XEN_NETIF_RX_RING_SIZE / MAX_SKB_FRAGS skbs into that another vif's
570 * internal queue, so we need several rounds of such timeouts until we
571 * can be sure that no another vif should have skb's from us. We are
572 * not sending more skb's, so newly stuck packets are not interesting
573 * for us here.
574 */
575 unsigned int worst_case_skb_lifetime = (rx_drain_timeout_msecs/1000) *
576 DIV_ROUND_UP(XENVIF_QUEUE_LENGTH, (XEN_NETIF_RX_RING_SIZE / MAX_SKB_FRAGS));
577
578 for (i = 0; i < MAX_PENDING_REQS; ++i) {
579 if (vif->grant_tx_handle[i] != NETBACK_INVALID_HANDLE) {
580 unmap_timeout++;
581 schedule_timeout(msecs_to_jiffies(1000));
582 if (unmap_timeout > worst_case_skb_lifetime &&
583 net_ratelimit())
584 netdev_err(vif->dev,
585 "Page still granted! Index: %x\n",
586 i);
587 /* If there are still unmapped pages, reset the loop to
588 * start checking again. We shouldn't exit here until
589 * dealloc thread and NAPI instance release all the
590 * pages. If a kernel bug causes the skbs to stall
591 * somewhere, the interface cannot be brought down
592 * properly.
593 */
594 i = -1;
595 }
596 }
597
598 free_xenballooned_pages(MAX_PENDING_REQS, vif->mmap_pages);
599
600 netif_napi_del(&vif->napi);
601
602 unregister_netdev(vif->dev);
603
604 vfree(vif->grant_copy_op);
605 free_netdev(vif->dev);
606
607 module_put(THIS_MODULE);
608}
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/kthread.h>
34#include <linux/sched/task.h>
35#include <linux/ethtool.h>
36#include <linux/rtnetlink.h>
37#include <linux/if_vlan.h>
38#include <linux/vmalloc.h>
39
40#include <xen/events.h>
41#include <asm/xen/hypercall.h>
42#include <xen/balloon.h>
43
44#define XENVIF_QUEUE_LENGTH 32
45
46/* Number of bytes allowed on the internal guest Rx queue. */
47#define XENVIF_RX_QUEUE_BYTES (XEN_NETIF_RX_RING_SIZE/2 * PAGE_SIZE)
48
49/* This function is used to set SKBFL_ZEROCOPY_ENABLE as well as
50 * increasing the inflight counter. We need to increase the inflight
51 * counter because core driver calls into xenvif_zerocopy_callback
52 * which calls xenvif_skb_zerocopy_complete.
53 */
54void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
55 struct sk_buff *skb)
56{
57 skb_shinfo(skb)->flags |= SKBFL_ZEROCOPY_ENABLE;
58 atomic_inc(&queue->inflight_packets);
59}
60
61void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue)
62{
63 atomic_dec(&queue->inflight_packets);
64
65 /* Wake the dealloc thread _after_ decrementing inflight_packets so
66 * that if kthread_stop() has already been called, the dealloc thread
67 * does not wait forever with nothing to wake it.
68 */
69 wake_up(&queue->dealloc_wq);
70}
71
72static int xenvif_schedulable(struct xenvif *vif)
73{
74 return netif_running(vif->dev) &&
75 test_bit(VIF_STATUS_CONNECTED, &vif->status) &&
76 !vif->disabled;
77}
78
79static bool xenvif_handle_tx_interrupt(struct xenvif_queue *queue)
80{
81 bool rc;
82
83 rc = RING_HAS_UNCONSUMED_REQUESTS(&queue->tx);
84 if (rc)
85 napi_schedule(&queue->napi);
86 return rc;
87}
88
89static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
90{
91 struct xenvif_queue *queue = dev_id;
92 int old;
93
94 old = atomic_fetch_or(NETBK_TX_EOI, &queue->eoi_pending);
95 WARN(old & NETBK_TX_EOI, "Interrupt while EOI pending\n");
96
97 if (!xenvif_handle_tx_interrupt(queue)) {
98 atomic_andnot(NETBK_TX_EOI, &queue->eoi_pending);
99 xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
100 }
101
102 return IRQ_HANDLED;
103}
104
105static int xenvif_poll(struct napi_struct *napi, int budget)
106{
107 struct xenvif_queue *queue =
108 container_of(napi, struct xenvif_queue, napi);
109 int work_done;
110
111 /* This vif is rogue, we pretend we've there is nothing to do
112 * for this vif to deschedule it from NAPI. But this interface
113 * will be turned off in thread context later.
114 */
115 if (unlikely(queue->vif->disabled)) {
116 napi_complete(napi);
117 return 0;
118 }
119
120 work_done = xenvif_tx_action(queue, budget);
121
122 if (work_done < budget) {
123 napi_complete_done(napi, work_done);
124 /* If the queue is rate-limited, it shall be
125 * rescheduled in the timer callback.
126 */
127 if (likely(!queue->rate_limited))
128 xenvif_napi_schedule_or_enable_events(queue);
129 }
130
131 return work_done;
132}
133
134static bool xenvif_handle_rx_interrupt(struct xenvif_queue *queue)
135{
136 bool rc;
137
138 rc = xenvif_have_rx_work(queue, false);
139 if (rc)
140 xenvif_kick_thread(queue);
141 return rc;
142}
143
144static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id)
145{
146 struct xenvif_queue *queue = dev_id;
147 int old;
148
149 old = atomic_fetch_or(NETBK_RX_EOI, &queue->eoi_pending);
150 WARN(old & NETBK_RX_EOI, "Interrupt while EOI pending\n");
151
152 if (!xenvif_handle_rx_interrupt(queue)) {
153 atomic_andnot(NETBK_RX_EOI, &queue->eoi_pending);
154 xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
155 }
156
157 return IRQ_HANDLED;
158}
159
160irqreturn_t xenvif_interrupt(int irq, void *dev_id)
161{
162 struct xenvif_queue *queue = dev_id;
163 int old;
164 bool has_rx, has_tx;
165
166 old = atomic_fetch_or(NETBK_COMMON_EOI, &queue->eoi_pending);
167 WARN(old, "Interrupt while EOI pending\n");
168
169 has_tx = xenvif_handle_tx_interrupt(queue);
170 has_rx = xenvif_handle_rx_interrupt(queue);
171
172 if (!has_rx && !has_tx) {
173 atomic_andnot(NETBK_COMMON_EOI, &queue->eoi_pending);
174 xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
175 }
176
177 return IRQ_HANDLED;
178}
179
180static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
181 struct net_device *sb_dev)
182{
183 struct xenvif *vif = netdev_priv(dev);
184 unsigned int size = vif->hash.size;
185 unsigned int num_queues;
186
187 /* If queues are not set up internally - always return 0
188 * as the packet going to be dropped anyway */
189 num_queues = READ_ONCE(vif->num_queues);
190 if (num_queues < 1)
191 return 0;
192
193 if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
194 return netdev_pick_tx(dev, skb, NULL) %
195 dev->real_num_tx_queues;
196
197 xenvif_set_skb_hash(vif, skb);
198
199 if (size == 0)
200 return skb_get_hash_raw(skb) % dev->real_num_tx_queues;
201
202 return vif->hash.mapping[vif->hash.mapping_sel]
203 [skb_get_hash_raw(skb) % size];
204}
205
206static netdev_tx_t
207xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
208{
209 struct xenvif *vif = netdev_priv(dev);
210 struct xenvif_queue *queue = NULL;
211 unsigned int num_queues;
212 u16 index;
213 struct xenvif_rx_cb *cb;
214
215 BUG_ON(skb->dev != dev);
216
217 /* Drop the packet if queues are not set up.
218 * This handler should be called inside an RCU read section
219 * so we don't need to enter it here explicitly.
220 */
221 num_queues = READ_ONCE(vif->num_queues);
222 if (num_queues < 1)
223 goto drop;
224
225 /* Obtain the queue to be used to transmit this packet */
226 index = skb_get_queue_mapping(skb);
227 if (index >= num_queues) {
228 pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n",
229 index, vif->dev->name);
230 index %= num_queues;
231 }
232 queue = &vif->queues[index];
233
234 /* Drop the packet if queue is not ready */
235 if (queue->task == NULL ||
236 queue->dealloc_task == NULL ||
237 !xenvif_schedulable(vif))
238 goto drop;
239
240 if (vif->multicast_control && skb->pkt_type == PACKET_MULTICAST) {
241 struct ethhdr *eth = (struct ethhdr *)skb->data;
242
243 if (!xenvif_mcast_match(vif, eth->h_dest))
244 goto drop;
245 }
246
247 cb = XENVIF_RX_CB(skb);
248 cb->expires = jiffies + vif->drain_timeout;
249
250 /* If there is no hash algorithm configured then make sure there
251 * is no hash information in the socket buffer otherwise it
252 * would be incorrectly forwarded to the frontend.
253 */
254 if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
255 skb_clear_hash(skb);
256
257 if (!xenvif_rx_queue_tail(queue, skb))
258 goto drop;
259
260 xenvif_kick_thread(queue);
261
262 return NETDEV_TX_OK;
263
264 drop:
265 vif->dev->stats.tx_dropped++;
266 dev_kfree_skb_any(skb);
267 return NETDEV_TX_OK;
268}
269
270static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
271{
272 struct xenvif *vif = netdev_priv(dev);
273 struct xenvif_queue *queue = NULL;
274 unsigned int num_queues;
275 u64 rx_bytes = 0;
276 u64 rx_packets = 0;
277 u64 tx_bytes = 0;
278 u64 tx_packets = 0;
279 unsigned int index;
280
281 rcu_read_lock();
282 num_queues = READ_ONCE(vif->num_queues);
283
284 /* Aggregate tx and rx stats from each queue */
285 for (index = 0; index < num_queues; ++index) {
286 queue = &vif->queues[index];
287 rx_bytes += queue->stats.rx_bytes;
288 rx_packets += queue->stats.rx_packets;
289 tx_bytes += queue->stats.tx_bytes;
290 tx_packets += queue->stats.tx_packets;
291 }
292
293 rcu_read_unlock();
294
295 vif->dev->stats.rx_bytes = rx_bytes;
296 vif->dev->stats.rx_packets = rx_packets;
297 vif->dev->stats.tx_bytes = tx_bytes;
298 vif->dev->stats.tx_packets = tx_packets;
299
300 return &vif->dev->stats;
301}
302
303static void xenvif_up(struct xenvif *vif)
304{
305 struct xenvif_queue *queue = NULL;
306 unsigned int num_queues = vif->num_queues;
307 unsigned int queue_index;
308
309 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
310 queue = &vif->queues[queue_index];
311 napi_enable(&queue->napi);
312 enable_irq(queue->tx_irq);
313 if (queue->tx_irq != queue->rx_irq)
314 enable_irq(queue->rx_irq);
315 xenvif_napi_schedule_or_enable_events(queue);
316 }
317}
318
319static void xenvif_down(struct xenvif *vif)
320{
321 struct xenvif_queue *queue = NULL;
322 unsigned int num_queues = vif->num_queues;
323 unsigned int queue_index;
324
325 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
326 queue = &vif->queues[queue_index];
327 disable_irq(queue->tx_irq);
328 if (queue->tx_irq != queue->rx_irq)
329 disable_irq(queue->rx_irq);
330 napi_disable(&queue->napi);
331 del_timer_sync(&queue->credit_timeout);
332 }
333}
334
335static int xenvif_open(struct net_device *dev)
336{
337 struct xenvif *vif = netdev_priv(dev);
338 if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
339 xenvif_up(vif);
340 netif_tx_start_all_queues(dev);
341 return 0;
342}
343
344static int xenvif_close(struct net_device *dev)
345{
346 struct xenvif *vif = netdev_priv(dev);
347 if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
348 xenvif_down(vif);
349 netif_tx_stop_all_queues(dev);
350 return 0;
351}
352
353static int xenvif_change_mtu(struct net_device *dev, int mtu)
354{
355 struct xenvif *vif = netdev_priv(dev);
356 int max = vif->can_sg ? ETH_MAX_MTU - VLAN_ETH_HLEN : ETH_DATA_LEN;
357
358 if (mtu > max)
359 return -EINVAL;
360 dev->mtu = mtu;
361 return 0;
362}
363
364static netdev_features_t xenvif_fix_features(struct net_device *dev,
365 netdev_features_t features)
366{
367 struct xenvif *vif = netdev_priv(dev);
368
369 if (!vif->can_sg)
370 features &= ~NETIF_F_SG;
371 if (~(vif->gso_mask) & GSO_BIT(TCPV4))
372 features &= ~NETIF_F_TSO;
373 if (~(vif->gso_mask) & GSO_BIT(TCPV6))
374 features &= ~NETIF_F_TSO6;
375 if (!vif->ip_csum)
376 features &= ~NETIF_F_IP_CSUM;
377 if (!vif->ipv6_csum)
378 features &= ~NETIF_F_IPV6_CSUM;
379
380 return features;
381}
382
383static const struct xenvif_stat {
384 char name[ETH_GSTRING_LEN];
385 u16 offset;
386} xenvif_stats[] = {
387 {
388 "rx_gso_checksum_fixup",
389 offsetof(struct xenvif_stats, rx_gso_checksum_fixup)
390 },
391 /* If (sent != success + fail), there are probably packets never
392 * freed up properly!
393 */
394 {
395 "tx_zerocopy_sent",
396 offsetof(struct xenvif_stats, tx_zerocopy_sent),
397 },
398 {
399 "tx_zerocopy_success",
400 offsetof(struct xenvif_stats, tx_zerocopy_success),
401 },
402 {
403 "tx_zerocopy_fail",
404 offsetof(struct xenvif_stats, tx_zerocopy_fail)
405 },
406 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use
407 * a guest with the same MAX_SKB_FRAG
408 */
409 {
410 "tx_frag_overflow",
411 offsetof(struct xenvif_stats, tx_frag_overflow)
412 },
413};
414
415static int xenvif_get_sset_count(struct net_device *dev, int string_set)
416{
417 switch (string_set) {
418 case ETH_SS_STATS:
419 return ARRAY_SIZE(xenvif_stats);
420 default:
421 return -EINVAL;
422 }
423}
424
425static void xenvif_get_ethtool_stats(struct net_device *dev,
426 struct ethtool_stats *stats, u64 * data)
427{
428 struct xenvif *vif = netdev_priv(dev);
429 unsigned int num_queues;
430 int i;
431 unsigned int queue_index;
432
433 rcu_read_lock();
434 num_queues = READ_ONCE(vif->num_queues);
435
436 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) {
437 unsigned long accum = 0;
438 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
439 void *vif_stats = &vif->queues[queue_index].stats;
440 accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset);
441 }
442 data[i] = accum;
443 }
444
445 rcu_read_unlock();
446}
447
448static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
449{
450 int i;
451
452 switch (stringset) {
453 case ETH_SS_STATS:
454 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
455 memcpy(data + i * ETH_GSTRING_LEN,
456 xenvif_stats[i].name, ETH_GSTRING_LEN);
457 break;
458 }
459}
460
461static const struct ethtool_ops xenvif_ethtool_ops = {
462 .get_link = ethtool_op_get_link,
463
464 .get_sset_count = xenvif_get_sset_count,
465 .get_ethtool_stats = xenvif_get_ethtool_stats,
466 .get_strings = xenvif_get_strings,
467};
468
469static const struct net_device_ops xenvif_netdev_ops = {
470 .ndo_select_queue = xenvif_select_queue,
471 .ndo_start_xmit = xenvif_start_xmit,
472 .ndo_get_stats = xenvif_get_stats,
473 .ndo_open = xenvif_open,
474 .ndo_stop = xenvif_close,
475 .ndo_change_mtu = xenvif_change_mtu,
476 .ndo_fix_features = xenvif_fix_features,
477 .ndo_set_mac_address = eth_mac_addr,
478 .ndo_validate_addr = eth_validate_addr,
479};
480
481struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
482 unsigned int handle)
483{
484 static const u8 dummy_addr[ETH_ALEN] = {
485 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff,
486 };
487 int err;
488 struct net_device *dev;
489 struct xenvif *vif;
490 char name[IFNAMSIZ] = {};
491
492 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
493 /* Allocate a netdev with the max. supported number of queues.
494 * When the guest selects the desired number, it will be updated
495 * via netif_set_real_num_*_queues().
496 */
497 dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN,
498 ether_setup, xenvif_max_queues);
499 if (dev == NULL) {
500 pr_warn("Could not allocate netdev for %s\n", name);
501 return ERR_PTR(-ENOMEM);
502 }
503
504 SET_NETDEV_DEV(dev, parent);
505
506 vif = netdev_priv(dev);
507
508 vif->domid = domid;
509 vif->handle = handle;
510 vif->can_sg = 1;
511 vif->ip_csum = 1;
512 vif->dev = dev;
513 vif->disabled = false;
514 vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs);
515 vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs);
516
517 /* Start out with no queues. */
518 vif->queues = NULL;
519 vif->num_queues = 0;
520
521 vif->xdp_headroom = 0;
522
523 spin_lock_init(&vif->lock);
524 INIT_LIST_HEAD(&vif->fe_mcast_addr);
525
526 dev->netdev_ops = &xenvif_netdev_ops;
527 dev->hw_features = NETIF_F_SG |
528 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
529 NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_FRAGLIST;
530 dev->features = dev->hw_features | NETIF_F_RXCSUM;
531 dev->ethtool_ops = &xenvif_ethtool_ops;
532
533 dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
534
535 dev->min_mtu = ETH_MIN_MTU;
536 dev->max_mtu = ETH_MAX_MTU - VLAN_ETH_HLEN;
537
538 /*
539 * Initialise a dummy MAC address. We choose the numerically
540 * largest non-broadcast address to prevent the address getting
541 * stolen by an Ethernet bridge for STP purposes.
542 * (FE:FF:FF:FF:FF:FF)
543 */
544 eth_hw_addr_set(dev, dummy_addr);
545
546 netif_carrier_off(dev);
547
548 err = register_netdev(dev);
549 if (err) {
550 netdev_warn(dev, "Could not register device: err=%d\n", err);
551 free_netdev(dev);
552 return ERR_PTR(err);
553 }
554
555 netdev_dbg(dev, "Successfully created xenvif\n");
556
557 __module_get(THIS_MODULE);
558
559 return vif;
560}
561
562int xenvif_init_queue(struct xenvif_queue *queue)
563{
564 int err, i;
565
566 queue->credit_bytes = queue->remaining_credit = ~0UL;
567 queue->credit_usec = 0UL;
568 timer_setup(&queue->credit_timeout, xenvif_tx_credit_callback, 0);
569 queue->credit_window_start = get_jiffies_64();
570
571 queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES;
572
573 skb_queue_head_init(&queue->rx_queue);
574 skb_queue_head_init(&queue->tx_queue);
575
576 queue->pending_cons = 0;
577 queue->pending_prod = MAX_PENDING_REQS;
578 for (i = 0; i < MAX_PENDING_REQS; ++i)
579 queue->pending_ring[i] = i;
580
581 spin_lock_init(&queue->callback_lock);
582 spin_lock_init(&queue->response_lock);
583
584 /* If ballooning is disabled, this will consume real memory, so you
585 * better enable it. The long term solution would be to use just a
586 * bunch of valid page descriptors, without dependency on ballooning
587 */
588 err = gnttab_alloc_pages(MAX_PENDING_REQS,
589 queue->mmap_pages);
590 if (err) {
591 netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n");
592 return -ENOMEM;
593 }
594
595 for (i = 0; i < MAX_PENDING_REQS; i++) {
596 queue->pending_tx_info[i].callback_struct = (struct ubuf_info_msgzc)
597 { { .callback = xenvif_zerocopy_callback },
598 { { .ctx = NULL,
599 .desc = i } } };
600 queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
601 }
602
603 return 0;
604}
605
606void xenvif_carrier_on(struct xenvif *vif)
607{
608 rtnl_lock();
609 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
610 dev_set_mtu(vif->dev, ETH_DATA_LEN);
611 netdev_update_features(vif->dev);
612 set_bit(VIF_STATUS_CONNECTED, &vif->status);
613 if (netif_running(vif->dev))
614 xenvif_up(vif);
615 rtnl_unlock();
616}
617
618int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
619 unsigned int evtchn)
620{
621 struct net_device *dev = vif->dev;
622 struct xenbus_device *xendev = xenvif_to_xenbus_device(vif);
623 void *addr;
624 struct xen_netif_ctrl_sring *shared;
625 RING_IDX rsp_prod, req_prod;
626 int err;
627
628 err = xenbus_map_ring_valloc(xendev, &ring_ref, 1, &addr);
629 if (err)
630 goto err;
631
632 shared = (struct xen_netif_ctrl_sring *)addr;
633 rsp_prod = READ_ONCE(shared->rsp_prod);
634 req_prod = READ_ONCE(shared->req_prod);
635
636 BACK_RING_ATTACH(&vif->ctrl, shared, rsp_prod, XEN_PAGE_SIZE);
637
638 err = -EIO;
639 if (req_prod - rsp_prod > RING_SIZE(&vif->ctrl))
640 goto err_unmap;
641
642 err = bind_interdomain_evtchn_to_irq_lateeoi(xendev, evtchn);
643 if (err < 0)
644 goto err_unmap;
645
646 vif->ctrl_irq = err;
647
648 xenvif_init_hash(vif);
649
650 err = request_threaded_irq(vif->ctrl_irq, NULL, xenvif_ctrl_irq_fn,
651 IRQF_ONESHOT, "xen-netback-ctrl", vif);
652 if (err) {
653 pr_warn("Could not setup irq handler for %s\n", dev->name);
654 goto err_deinit;
655 }
656
657 return 0;
658
659err_deinit:
660 xenvif_deinit_hash(vif);
661 unbind_from_irqhandler(vif->ctrl_irq, vif);
662 vif->ctrl_irq = 0;
663
664err_unmap:
665 xenbus_unmap_ring_vfree(xendev, vif->ctrl.sring);
666 vif->ctrl.sring = NULL;
667
668err:
669 return err;
670}
671
672static void xenvif_disconnect_queue(struct xenvif_queue *queue)
673{
674 if (queue->task) {
675 kthread_stop(queue->task);
676 put_task_struct(queue->task);
677 queue->task = NULL;
678 }
679
680 if (queue->dealloc_task) {
681 kthread_stop(queue->dealloc_task);
682 queue->dealloc_task = NULL;
683 }
684
685 if (queue->napi.poll) {
686 netif_napi_del(&queue->napi);
687 queue->napi.poll = NULL;
688 }
689
690 if (queue->tx_irq) {
691 unbind_from_irqhandler(queue->tx_irq, queue);
692 if (queue->tx_irq == queue->rx_irq)
693 queue->rx_irq = 0;
694 queue->tx_irq = 0;
695 }
696
697 if (queue->rx_irq) {
698 unbind_from_irqhandler(queue->rx_irq, queue);
699 queue->rx_irq = 0;
700 }
701
702 xenvif_unmap_frontend_data_rings(queue);
703}
704
705int xenvif_connect_data(struct xenvif_queue *queue,
706 unsigned long tx_ring_ref,
707 unsigned long rx_ring_ref,
708 unsigned int tx_evtchn,
709 unsigned int rx_evtchn)
710{
711 struct xenbus_device *dev = xenvif_to_xenbus_device(queue->vif);
712 struct task_struct *task;
713 int err;
714
715 BUG_ON(queue->tx_irq);
716 BUG_ON(queue->task);
717 BUG_ON(queue->dealloc_task);
718
719 err = xenvif_map_frontend_data_rings(queue, tx_ring_ref,
720 rx_ring_ref);
721 if (err < 0)
722 goto err;
723
724 init_waitqueue_head(&queue->wq);
725 init_waitqueue_head(&queue->dealloc_wq);
726 atomic_set(&queue->inflight_packets, 0);
727
728 netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll);
729
730 queue->stalled = true;
731
732 task = kthread_run(xenvif_kthread_guest_rx, queue,
733 "%s-guest-rx", queue->name);
734 if (IS_ERR(task))
735 goto kthread_err;
736 queue->task = task;
737 /*
738 * Take a reference to the task in order to prevent it from being freed
739 * if the thread function returns before kthread_stop is called.
740 */
741 get_task_struct(task);
742
743 task = kthread_run(xenvif_dealloc_kthread, queue,
744 "%s-dealloc", queue->name);
745 if (IS_ERR(task))
746 goto kthread_err;
747 queue->dealloc_task = task;
748
749 if (tx_evtchn == rx_evtchn) {
750 /* feature-split-event-channels == 0 */
751 err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
752 dev, tx_evtchn, xenvif_interrupt, 0,
753 queue->name, queue);
754 if (err < 0)
755 goto err;
756 queue->tx_irq = queue->rx_irq = err;
757 disable_irq(queue->tx_irq);
758 } else {
759 /* feature-split-event-channels == 1 */
760 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
761 "%s-tx", queue->name);
762 err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
763 dev, tx_evtchn, xenvif_tx_interrupt, 0,
764 queue->tx_irq_name, queue);
765 if (err < 0)
766 goto err;
767 queue->tx_irq = err;
768 disable_irq(queue->tx_irq);
769
770 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
771 "%s-rx", queue->name);
772 err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
773 dev, rx_evtchn, xenvif_rx_interrupt, 0,
774 queue->rx_irq_name, queue);
775 if (err < 0)
776 goto err;
777 queue->rx_irq = err;
778 disable_irq(queue->rx_irq);
779 }
780
781 return 0;
782
783kthread_err:
784 pr_warn("Could not allocate kthread for %s\n", queue->name);
785 err = PTR_ERR(task);
786err:
787 xenvif_disconnect_queue(queue);
788 return err;
789}
790
791void xenvif_carrier_off(struct xenvif *vif)
792{
793 struct net_device *dev = vif->dev;
794
795 rtnl_lock();
796 if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) {
797 netif_carrier_off(dev); /* discard queued packets */
798 if (netif_running(dev))
799 xenvif_down(vif);
800 }
801 rtnl_unlock();
802}
803
804void xenvif_disconnect_data(struct xenvif *vif)
805{
806 struct xenvif_queue *queue = NULL;
807 unsigned int num_queues = vif->num_queues;
808 unsigned int queue_index;
809
810 xenvif_carrier_off(vif);
811
812 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
813 queue = &vif->queues[queue_index];
814
815 xenvif_disconnect_queue(queue);
816 }
817
818 xenvif_mcast_addr_list_free(vif);
819}
820
821void xenvif_disconnect_ctrl(struct xenvif *vif)
822{
823 if (vif->ctrl_irq) {
824 xenvif_deinit_hash(vif);
825 unbind_from_irqhandler(vif->ctrl_irq, vif);
826 vif->ctrl_irq = 0;
827 }
828
829 if (vif->ctrl.sring) {
830 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
831 vif->ctrl.sring);
832 vif->ctrl.sring = NULL;
833 }
834}
835
836/* Reverse the relevant parts of xenvif_init_queue().
837 * Used for queue teardown from xenvif_free(), and on the
838 * error handling paths in xenbus.c:connect().
839 */
840void xenvif_deinit_queue(struct xenvif_queue *queue)
841{
842 gnttab_free_pages(MAX_PENDING_REQS, queue->mmap_pages);
843}
844
845void xenvif_free(struct xenvif *vif)
846{
847 struct xenvif_queue *queues = vif->queues;
848 unsigned int num_queues = vif->num_queues;
849 unsigned int queue_index;
850
851 unregister_netdev(vif->dev);
852 free_netdev(vif->dev);
853
854 for (queue_index = 0; queue_index < num_queues; ++queue_index)
855 xenvif_deinit_queue(&queues[queue_index]);
856 vfree(queues);
857
858 module_put(THIS_MODULE);
859}