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CommitLineData
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>
0881e7bd 34#include <linux/sched/task.h>
f942dc25
IC
35#include <linux/ethtool.h>
36#include <linux/rtnetlink.h>
37#include <linux/if_vlan.h>
e7b599d7 38#include <linux/vmalloc.h>
f942dc25
IC
39
40#include <xen/events.h>
41#include <asm/xen/hypercall.h>
f53c3fe8 42#include <xen/balloon.h>
f942dc25
IC
43
44#define XENVIF_QUEUE_LENGTH 32
b3f980bd 45#define XENVIF_NAPI_WEIGHT 64
f942dc25 46
f48da8b1
DV
47/* Number of bytes allowed on the internal guest Rx queue. */
48#define XENVIF_RX_QUEUE_BYTES (XEN_NETIF_RX_RING_SIZE/2 * PAGE_SIZE)
49
a64bd934
WL
50/* This function is used to set SKBTX_DEV_ZEROCOPY as well as
51 * increasing the inflight counter. We need to increase the inflight
52 * counter because core driver calls into xenvif_zerocopy_callback
53 * which calls xenvif_skb_zerocopy_complete.
54 */
55void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
56 struct sk_buff *skb)
57{
58 skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
59 atomic_inc(&queue->inflight_packets);
60}
61
62void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue)
63{
64 atomic_dec(&queue->inflight_packets);
57b22906
RL
65
66 /* Wake the dealloc thread _after_ decrementing inflight_packets so
67 * that if kthread_stop() has already been called, the dealloc thread
68 * does not wait forever with nothing to wake it.
69 */
70 wake_up(&queue->dealloc_wq);
a64bd934
WL
71}
72
f942dc25
IC
73int xenvif_schedulable(struct xenvif *vif)
74{
3d1af1df 75 return netif_running(vif->dev) &&
f48da8b1
DV
76 test_bit(VIF_STATUS_CONNECTED, &vif->status) &&
77 !vif->disabled;
f942dc25
IC
78}
79
e1f00a69 80static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
f942dc25 81{
e9ce7cb6 82 struct xenvif_queue *queue = dev_id;
f942dc25 83
e9ce7cb6
WL
84 if (RING_HAS_UNCONSUMED_REQUESTS(&queue->tx))
85 napi_schedule(&queue->napi);
f942dc25 86
e1f00a69
WL
87 return IRQ_HANDLED;
88}
89
38741d50 90static int xenvif_poll(struct napi_struct *napi, int budget)
b3f980bd 91{
e9ce7cb6
WL
92 struct xenvif_queue *queue =
93 container_of(napi, struct xenvif_queue, napi);
b3f980bd
WL
94 int work_done;
95
e9d8b2c2
WL
96 /* This vif is rogue, we pretend we've there is nothing to do
97 * for this vif to deschedule it from NAPI. But this interface
98 * will be turned off in thread context later.
99 */
2561cc15 100 if (unlikely(queue->vif->disabled)) {
e9d8b2c2
WL
101 napi_complete(napi);
102 return 0;
103 }
104
e9ce7cb6 105 work_done = xenvif_tx_action(queue, budget);
b3f980bd
WL
106
107 if (work_done < budget) {
6ad20165 108 napi_complete_done(napi, work_done);
e9ce7cb6 109 xenvif_napi_schedule_or_enable_events(queue);
b3f980bd
WL
110 }
111
112 return work_done;
113}
114
e1f00a69
WL
115static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id)
116{
e9ce7cb6 117 struct xenvif_queue *queue = dev_id;
e1f00a69 118
e9ce7cb6 119 xenvif_kick_thread(queue);
f942dc25
IC
120
121 return IRQ_HANDLED;
122}
123
f51de243 124irqreturn_t xenvif_interrupt(int irq, void *dev_id)
e1f00a69
WL
125{
126 xenvif_tx_interrupt(irq, dev_id);
127 xenvif_rx_interrupt(irq, dev_id);
128
129 return IRQ_HANDLED;
130}
131
e9ce7cb6
WL
132int xenvif_queue_stopped(struct xenvif_queue *queue)
133{
134 struct net_device *dev = queue->vif->dev;
135 unsigned int id = queue->id;
136 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, id));
137}
138
139void xenvif_wake_queue(struct xenvif_queue *queue)
140{
141 struct net_device *dev = queue->vif->dev;
142 unsigned int id = queue->id;
143 netif_tx_wake_queue(netdev_get_tx_queue(dev, id));
144}
145
40d8abde
PD
146static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
147 void *accel_priv,
148 select_queue_fallback_t fallback)
149{
150 struct xenvif *vif = netdev_priv(dev);
151 unsigned int size = vif->hash.size;
152
912e27e8
PD
153 if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
154 return fallback(dev, skb) % dev->real_num_tx_queues;
40d8abde
PD
155
156 xenvif_set_skb_hash(vif, skb);
157
158 if (size == 0)
159 return skb_get_hash_raw(skb) % dev->real_num_tx_queues;
160
161 return vif->hash.mapping[skb_get_hash_raw(skb) % size];
162}
163
f942dc25
IC
164static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
165{
166 struct xenvif *vif = netdev_priv(dev);
e9ce7cb6 167 struct xenvif_queue *queue = NULL;
f7b50c4e 168 unsigned int num_queues = vif->num_queues;
e9ce7cb6 169 u16 index;
f48da8b1 170 struct xenvif_rx_cb *cb;
f942dc25
IC
171
172 BUG_ON(skb->dev != dev);
173
e9ce7cb6
WL
174 /* Drop the packet if queues are not set up */
175 if (num_queues < 1)
176 goto drop;
177
178 /* Obtain the queue to be used to transmit this packet */
179 index = skb_get_queue_mapping(skb);
180 if (index >= num_queues) {
181 pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n.",
182 index, vif->dev->name);
183 index %= num_queues;
184 }
185 queue = &vif->queues[index];
186
187 /* Drop the packet if queue is not ready */
188 if (queue->task == NULL ||
189 queue->dealloc_task == NULL ||
f53c3fe8 190 !xenvif_schedulable(vif))
f942dc25
IC
191 goto drop;
192
210c34dc
PD
193 if (vif->multicast_control && skb->pkt_type == PACKET_MULTICAST) {
194 struct ethhdr *eth = (struct ethhdr *)skb->data;
195
196 if (!xenvif_mcast_match(vif, eth->h_dest))
197 goto drop;
198 }
199
f48da8b1 200 cb = XENVIF_RX_CB(skb);
26c0e102 201 cb->expires = jiffies + vif->drain_timeout;
f942dc25 202
912e27e8
PD
203 /* If there is no hash algorithm configured then make sure there
204 * is no hash information in the socket buffer otherwise it
205 * would be incorrectly forwarded to the frontend.
206 */
207 if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
208 skb_clear_hash(skb);
209
f48da8b1 210 xenvif_rx_queue_tail(queue, skb);
e9ce7cb6 211 xenvif_kick_thread(queue);
f942dc25
IC
212
213 return NETDEV_TX_OK;
214
215 drop:
216 vif->dev->stats.tx_dropped++;
217 dev_kfree_skb(skb);
218 return NETDEV_TX_OK;
219}
220
f942dc25
IC
221static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
222{
223 struct xenvif *vif = netdev_priv(dev);
e9ce7cb6 224 struct xenvif_queue *queue = NULL;
ebf692f8
MS
225 u64 rx_bytes = 0;
226 u64 rx_packets = 0;
227 u64 tx_bytes = 0;
228 u64 tx_packets = 0;
e9ce7cb6
WL
229 unsigned int index;
230
f16f1df6 231 spin_lock(&vif->lock);
e9ce7cb6
WL
232 if (vif->queues == NULL)
233 goto out;
234
235 /* Aggregate tx and rx stats from each queue */
f16f1df6 236 for (index = 0; index < vif->num_queues; ++index) {
e9ce7cb6
WL
237 queue = &vif->queues[index];
238 rx_bytes += queue->stats.rx_bytes;
239 rx_packets += queue->stats.rx_packets;
240 tx_bytes += queue->stats.tx_bytes;
241 tx_packets += queue->stats.tx_packets;
242 }
243
244out:
f16f1df6
ID
245 spin_unlock(&vif->lock);
246
e9ce7cb6
WL
247 vif->dev->stats.rx_bytes = rx_bytes;
248 vif->dev->stats.rx_packets = rx_packets;
249 vif->dev->stats.tx_bytes = tx_bytes;
250 vif->dev->stats.tx_packets = tx_packets;
251
f942dc25
IC
252 return &vif->dev->stats;
253}
254
255static void xenvif_up(struct xenvif *vif)
256{
e9ce7cb6 257 struct xenvif_queue *queue = NULL;
f7b50c4e 258 unsigned int num_queues = vif->num_queues;
e9ce7cb6
WL
259 unsigned int queue_index;
260
261 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
262 queue = &vif->queues[queue_index];
263 napi_enable(&queue->napi);
264 enable_irq(queue->tx_irq);
265 if (queue->tx_irq != queue->rx_irq)
266 enable_irq(queue->rx_irq);
267 xenvif_napi_schedule_or_enable_events(queue);
268 }
f942dc25
IC
269}
270
271static void xenvif_down(struct xenvif *vif)
272{
e9ce7cb6 273 struct xenvif_queue *queue = NULL;
f7b50c4e 274 unsigned int num_queues = vif->num_queues;
e9ce7cb6
WL
275 unsigned int queue_index;
276
277 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
278 queue = &vif->queues[queue_index];
e9ce7cb6
WL
279 disable_irq(queue->tx_irq);
280 if (queue->tx_irq != queue->rx_irq)
281 disable_irq(queue->rx_irq);
8fe78989 282 napi_disable(&queue->napi);
e9ce7cb6
WL
283 del_timer_sync(&queue->credit_timeout);
284 }
f942dc25
IC
285}
286
287static int xenvif_open(struct net_device *dev)
288{
289 struct xenvif *vif = netdev_priv(dev);
3d1af1df 290 if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
f942dc25 291 xenvif_up(vif);
e9ce7cb6 292 netif_tx_start_all_queues(dev);
f942dc25
IC
293 return 0;
294}
295
296static int xenvif_close(struct net_device *dev)
297{
298 struct xenvif *vif = netdev_priv(dev);
3d1af1df 299 if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
f942dc25 300 xenvif_down(vif);
e9ce7cb6 301 netif_tx_stop_all_queues(dev);
f942dc25
IC
302 return 0;
303}
304
305static int xenvif_change_mtu(struct net_device *dev, int mtu)
306{
307 struct xenvif *vif = netdev_priv(dev);
d0c2c997 308 int max = vif->can_sg ? ETH_MAX_MTU - VLAN_ETH_HLEN : ETH_DATA_LEN;
f942dc25
IC
309
310 if (mtu > max)
311 return -EINVAL;
312 dev->mtu = mtu;
313 return 0;
314}
315
c8f44aff
MM
316static netdev_features_t xenvif_fix_features(struct net_device *dev,
317 netdev_features_t features)
f942dc25
IC
318{
319 struct xenvif *vif = netdev_priv(dev);
f942dc25 320
47103041
MM
321 if (!vif->can_sg)
322 features &= ~NETIF_F_SG;
fedbc8c1 323 if (~(vif->gso_mask) & GSO_BIT(TCPV4))
47103041 324 features &= ~NETIF_F_TSO;
fedbc8c1 325 if (~(vif->gso_mask) & GSO_BIT(TCPV6))
82cada22 326 features &= ~NETIF_F_TSO6;
146c8a77 327 if (!vif->ip_csum)
47103041 328 features &= ~NETIF_F_IP_CSUM;
146c8a77
PD
329 if (!vif->ipv6_csum)
330 features &= ~NETIF_F_IPV6_CSUM;
f942dc25 331
47103041 332 return features;
f942dc25
IC
333}
334
335static const struct xenvif_stat {
336 char name[ETH_GSTRING_LEN];
337 u16 offset;
338} xenvif_stats[] = {
339 {
340 "rx_gso_checksum_fixup",
e9ce7cb6 341 offsetof(struct xenvif_stats, rx_gso_checksum_fixup)
f942dc25 342 },
1bb332af
ZK
343 /* If (sent != success + fail), there are probably packets never
344 * freed up properly!
345 */
346 {
347 "tx_zerocopy_sent",
e9ce7cb6 348 offsetof(struct xenvif_stats, tx_zerocopy_sent),
1bb332af
ZK
349 },
350 {
351 "tx_zerocopy_success",
e9ce7cb6 352 offsetof(struct xenvif_stats, tx_zerocopy_success),
1bb332af
ZK
353 },
354 {
355 "tx_zerocopy_fail",
e9ce7cb6 356 offsetof(struct xenvif_stats, tx_zerocopy_fail)
1bb332af 357 },
e3377f36
ZK
358 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use
359 * a guest with the same MAX_SKB_FRAG
360 */
361 {
362 "tx_frag_overflow",
e9ce7cb6 363 offsetof(struct xenvif_stats, tx_frag_overflow)
e3377f36 364 },
f942dc25
IC
365};
366
367static int xenvif_get_sset_count(struct net_device *dev, int string_set)
368{
369 switch (string_set) {
370 case ETH_SS_STATS:
371 return ARRAY_SIZE(xenvif_stats);
372 default:
373 return -EINVAL;
374 }
375}
376
377static void xenvif_get_ethtool_stats(struct net_device *dev,
378 struct ethtool_stats *stats, u64 * data)
379{
e9ce7cb6 380 struct xenvif *vif = netdev_priv(dev);
f7b50c4e 381 unsigned int num_queues = vif->num_queues;
f942dc25 382 int i;
e9ce7cb6 383 unsigned int queue_index;
e9ce7cb6
WL
384
385 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) {
386 unsigned long accum = 0;
387 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
d63951d7 388 void *vif_stats = &vif->queues[queue_index].stats;
e9ce7cb6
WL
389 accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset);
390 }
391 data[i] = accum;
392 }
f942dc25
IC
393}
394
395static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
396{
397 int i;
398
399 switch (stringset) {
400 case ETH_SS_STATS:
401 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
402 memcpy(data + i * ETH_GSTRING_LEN,
403 xenvif_stats[i].name, ETH_GSTRING_LEN);
404 break;
405 }
406}
407
813abbba 408static const struct ethtool_ops xenvif_ethtool_ops = {
f942dc25
IC
409 .get_link = ethtool_op_get_link,
410
411 .get_sset_count = xenvif_get_sset_count,
412 .get_ethtool_stats = xenvif_get_ethtool_stats,
413 .get_strings = xenvif_get_strings,
414};
415
813abbba 416static const struct net_device_ops xenvif_netdev_ops = {
40d8abde 417 .ndo_select_queue = xenvif_select_queue,
f942dc25
IC
418 .ndo_start_xmit = xenvif_start_xmit,
419 .ndo_get_stats = xenvif_get_stats,
420 .ndo_open = xenvif_open,
421 .ndo_stop = xenvif_close,
422 .ndo_change_mtu = xenvif_change_mtu,
47103041 423 .ndo_fix_features = xenvif_fix_features,
4a633a60
MW
424 .ndo_set_mac_address = eth_mac_addr,
425 .ndo_validate_addr = eth_validate_addr,
f942dc25
IC
426};
427
428struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
429 unsigned int handle)
430{
431 int err;
432 struct net_device *dev;
433 struct xenvif *vif;
434 char name[IFNAMSIZ] = {};
435
436 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
8d3d53b3
AB
437 /* Allocate a netdev with the max. supported number of queues.
438 * When the guest selects the desired number, it will be updated
f7b50c4e 439 * via netif_set_real_num_*_queues().
8d3d53b3 440 */
c835a677
TG
441 dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN,
442 ether_setup, xenvif_max_queues);
f942dc25 443 if (dev == NULL) {
b3f980bd 444 pr_warn("Could not allocate netdev for %s\n", name);
f942dc25
IC
445 return ERR_PTR(-ENOMEM);
446 }
447
448 SET_NETDEV_DEV(dev, parent);
449
450 vif = netdev_priv(dev);
ac3d5ac2 451
f942dc25
IC
452 vif->domid = domid;
453 vif->handle = handle;
f942dc25 454 vif->can_sg = 1;
146c8a77 455 vif->ip_csum = 1;
f942dc25 456 vif->dev = dev;
e9d8b2c2 457 vif->disabled = false;
26c0e102
DV
458 vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs);
459 vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs);
e9d8b2c2 460
f7b50c4e 461 /* Start out with no queues. */
e9ce7cb6 462 vif->queues = NULL;
f7b50c4e 463 vif->num_queues = 0;
09350788 464
ecf08d2d 465 spin_lock_init(&vif->lock);
210c34dc 466 INIT_LIST_HEAD(&vif->fe_mcast_addr);
ecf08d2d 467
f942dc25 468 dev->netdev_ops = &xenvif_netdev_ops;
146c8a77
PD
469 dev->hw_features = NETIF_F_SG |
470 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
2167ca02 471 NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_FRAGLIST;
7365bcfa 472 dev->features = dev->hw_features | NETIF_F_RXCSUM;
7ad24ea4 473 dev->ethtool_ops = &xenvif_ethtool_ops;
f942dc25
IC
474
475 dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
476
d0c2c997
JW
477 dev->min_mtu = 0;
478 dev->max_mtu = ETH_MAX_MTU - VLAN_ETH_HLEN;
479
f942dc25
IC
480 /*
481 * Initialise a dummy MAC address. We choose the numerically
482 * largest non-broadcast address to prevent the address getting
483 * stolen by an Ethernet bridge for STP purposes.
484 * (FE:FF:FF:FF:FF:FF)
485 */
3b6ed26d 486 eth_broadcast_addr(dev->dev_addr);
f942dc25
IC
487 dev->dev_addr[0] &= ~0x01;
488
489 netif_carrier_off(dev);
490
491 err = register_netdev(dev);
492 if (err) {
493 netdev_warn(dev, "Could not register device: err=%d\n", err);
494 free_netdev(dev);
495 return ERR_PTR(err);
496 }
497
498 netdev_dbg(dev, "Successfully created xenvif\n");
279f438e
PD
499
500 __module_get(THIS_MODULE);
501
f942dc25
IC
502 return vif;
503}
504
e9ce7cb6
WL
505int xenvif_init_queue(struct xenvif_queue *queue)
506{
507 int err, i;
508
509 queue->credit_bytes = queue->remaining_credit = ~0UL;
510 queue->credit_usec = 0UL;
511 init_timer(&queue->credit_timeout);
edafc132 512 queue->credit_timeout.function = xenvif_tx_credit_callback;
e9ce7cb6
WL
513 queue->credit_window_start = get_jiffies_64();
514
f48da8b1
DV
515 queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES;
516
e9ce7cb6
WL
517 skb_queue_head_init(&queue->rx_queue);
518 skb_queue_head_init(&queue->tx_queue);
519
520 queue->pending_cons = 0;
521 queue->pending_prod = MAX_PENDING_REQS;
522 for (i = 0; i < MAX_PENDING_REQS; ++i)
523 queue->pending_ring[i] = i;
524
525 spin_lock_init(&queue->callback_lock);
526 spin_lock_init(&queue->response_lock);
527
528 /* If ballooning is disabled, this will consume real memory, so you
529 * better enable it. The long term solution would be to use just a
530 * bunch of valid page descriptors, without dependency on ballooning
531 */
ff4b156f
DV
532 err = gnttab_alloc_pages(MAX_PENDING_REQS,
533 queue->mmap_pages);
e9ce7cb6
WL
534 if (err) {
535 netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n");
536 return -ENOMEM;
537 }
538
539 for (i = 0; i < MAX_PENDING_REQS; i++) {
540 queue->pending_tx_info[i].callback_struct = (struct ubuf_info)
541 { .callback = xenvif_zerocopy_callback,
542 .ctx = NULL,
543 .desc = i };
544 queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
545 }
546
e9ce7cb6
WL
547 return 0;
548}
549
550void xenvif_carrier_on(struct xenvif *vif)
551{
552 rtnl_lock();
553 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
554 dev_set_mtu(vif->dev, ETH_DATA_LEN);
555 netdev_update_features(vif->dev);
3d1af1df 556 set_bit(VIF_STATUS_CONNECTED, &vif->status);
e9ce7cb6
WL
557 if (netif_running(vif->dev))
558 xenvif_up(vif);
559 rtnl_unlock();
560}
561
4e15ee2c
PD
562int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
563 unsigned int evtchn)
564{
565 struct net_device *dev = vif->dev;
566 void *addr;
567 struct xen_netif_ctrl_sring *shared;
0364a882 568 int err;
4e15ee2c
PD
569
570 err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif),
571 &ring_ref, 1, &addr);
572 if (err)
573 goto err;
574
575 shared = (struct xen_netif_ctrl_sring *)addr;
576 BACK_RING_INIT(&vif->ctrl, shared, XEN_PAGE_SIZE);
577
0364a882 578 err = bind_interdomain_evtchn_to_irq(vif->domid, evtchn);
4e15ee2c
PD
579 if (err < 0)
580 goto err_unmap;
581
582 vif->ctrl_irq = err;
583
40d8abde
PD
584 xenvif_init_hash(vif);
585
0364a882
JG
586 err = request_threaded_irq(vif->ctrl_irq, NULL, xenvif_ctrl_irq_fn,
587 IRQF_ONESHOT, "xen-netback-ctrl", vif);
588 if (err) {
589 pr_warn("Could not setup irq handler for %s\n", dev->name);
4e15ee2c
PD
590 goto err_deinit;
591 }
592
4e15ee2c
PD
593 return 0;
594
595err_deinit:
40d8abde 596 xenvif_deinit_hash(vif);
4e15ee2c
PD
597 unbind_from_irqhandler(vif->ctrl_irq, vif);
598 vif->ctrl_irq = 0;
599
600err_unmap:
601 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
602 vif->ctrl.sring);
603 vif->ctrl.sring = NULL;
604
605err:
606 return err;
607}
608
609int xenvif_connect_data(struct xenvif_queue *queue,
610 unsigned long tx_ring_ref,
611 unsigned long rx_ring_ref,
612 unsigned int tx_evtchn,
613 unsigned int rx_evtchn)
f942dc25 614{
67fa3660 615 struct task_struct *task;
f942dc25
IC
616 int err = -ENOMEM;
617
e9ce7cb6
WL
618 BUG_ON(queue->tx_irq);
619 BUG_ON(queue->task);
620 BUG_ON(queue->dealloc_task);
f942dc25 621
4e15ee2c
PD
622 err = xenvif_map_frontend_data_rings(queue, tx_ring_ref,
623 rx_ring_ref);
f942dc25
IC
624 if (err < 0)
625 goto err;
626
e9ce7cb6
WL
627 init_waitqueue_head(&queue->wq);
628 init_waitqueue_head(&queue->dealloc_wq);
a64bd934 629 atomic_set(&queue->inflight_packets, 0);
ca2f09f2 630
e24f8191
WL
631 netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll,
632 XENVIF_NAPI_WEIGHT);
633
e1f00a69
WL
634 if (tx_evtchn == rx_evtchn) {
635 /* feature-split-event-channels == 0 */
636 err = bind_interdomain_evtchn_to_irqhandler(
e9ce7cb6
WL
637 queue->vif->domid, tx_evtchn, xenvif_interrupt, 0,
638 queue->name, queue);
e1f00a69
WL
639 if (err < 0)
640 goto err_unmap;
e9ce7cb6
WL
641 queue->tx_irq = queue->rx_irq = err;
642 disable_irq(queue->tx_irq);
e1f00a69
WL
643 } else {
644 /* feature-split-event-channels == 1 */
e9ce7cb6
WL
645 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
646 "%s-tx", queue->name);
e1f00a69 647 err = bind_interdomain_evtchn_to_irqhandler(
e9ce7cb6
WL
648 queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
649 queue->tx_irq_name, queue);
e1f00a69
WL
650 if (err < 0)
651 goto err_unmap;
e9ce7cb6
WL
652 queue->tx_irq = err;
653 disable_irq(queue->tx_irq);
e1f00a69 654
e9ce7cb6
WL
655 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
656 "%s-rx", queue->name);
e1f00a69 657 err = bind_interdomain_evtchn_to_irqhandler(
e9ce7cb6
WL
658 queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
659 queue->rx_irq_name, queue);
e1f00a69
WL
660 if (err < 0)
661 goto err_tx_unbind;
e9ce7cb6
WL
662 queue->rx_irq = err;
663 disable_irq(queue->rx_irq);
e1f00a69 664 }
f942dc25 665
ecf08d2d
DV
666 queue->stalled = true;
667
121fa4b7 668 task = kthread_create(xenvif_kthread_guest_rx,
e9ce7cb6 669 (void *)queue, "%s-guest-rx", queue->name);
67fa3660 670 if (IS_ERR(task)) {
e9ce7cb6 671 pr_warn("Could not allocate kthread for %s\n", queue->name);
67fa3660 672 err = PTR_ERR(task);
b3f980bd
WL
673 goto err_rx_unbind;
674 }
e9ce7cb6 675 queue->task = task;
42b5212f 676 get_task_struct(task);
67fa3660 677
f53c3fe8 678 task = kthread_create(xenvif_dealloc_kthread,
e9ce7cb6 679 (void *)queue, "%s-dealloc", queue->name);
f53c3fe8 680 if (IS_ERR(task)) {
e9ce7cb6 681 pr_warn("Could not allocate kthread for %s\n", queue->name);
f53c3fe8
ZK
682 err = PTR_ERR(task);
683 goto err_rx_unbind;
684 }
e9ce7cb6 685 queue->dealloc_task = task;
f53c3fe8 686
e9ce7cb6
WL
687 wake_up_process(queue->task);
688 wake_up_process(queue->dealloc_task);
b3f980bd 689
f942dc25 690 return 0;
b3f980bd
WL
691
692err_rx_unbind:
e9ce7cb6
WL
693 unbind_from_irqhandler(queue->rx_irq, queue);
694 queue->rx_irq = 0;
e1f00a69 695err_tx_unbind:
e9ce7cb6
WL
696 unbind_from_irqhandler(queue->tx_irq, queue);
697 queue->tx_irq = 0;
f942dc25 698err_unmap:
4e15ee2c 699 xenvif_unmap_frontend_data_rings(queue);
4a658527 700 netif_napi_del(&queue->napi);
f942dc25 701err:
b103f358 702 module_put(THIS_MODULE);
f942dc25
IC
703 return err;
704}
705
48856286 706void xenvif_carrier_off(struct xenvif *vif)
f942dc25
IC
707{
708 struct net_device *dev = vif->dev;
48856286
IC
709
710 rtnl_lock();
3d1af1df
ZK
711 if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) {
712 netif_carrier_off(dev); /* discard queued packets */
713 if (netif_running(dev))
714 xenvif_down(vif);
715 }
48856286 716 rtnl_unlock();
48856286
IC
717}
718
4e15ee2c 719void xenvif_disconnect_data(struct xenvif *vif)
48856286 720{
e9ce7cb6 721 struct xenvif_queue *queue = NULL;
f7b50c4e 722 unsigned int num_queues = vif->num_queues;
e9ce7cb6
WL
723 unsigned int queue_index;
724
3d1af1df 725 xenvif_carrier_off(vif);
f942dc25 726
e9ce7cb6
WL
727 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
728 queue = &vif->queues[queue_index];
db739ef3 729
ea2c5e13
WL
730 netif_napi_del(&queue->napi);
731
e9ce7cb6 732 if (queue->task) {
e9ce7cb6 733 kthread_stop(queue->task);
42b5212f 734 put_task_struct(queue->task);
e9ce7cb6
WL
735 queue->task = NULL;
736 }
f53c3fe8 737
e9ce7cb6
WL
738 if (queue->dealloc_task) {
739 kthread_stop(queue->dealloc_task);
740 queue->dealloc_task = NULL;
741 }
742
743 if (queue->tx_irq) {
744 if (queue->tx_irq == queue->rx_irq)
745 unbind_from_irqhandler(queue->tx_irq, queue);
746 else {
747 unbind_from_irqhandler(queue->tx_irq, queue);
748 unbind_from_irqhandler(queue->rx_irq, queue);
749 }
750 queue->tx_irq = 0;
e1f00a69 751 }
f942dc25 752
4e15ee2c 753 xenvif_unmap_frontend_data_rings(queue);
e9ce7cb6 754 }
210c34dc
PD
755
756 xenvif_mcast_addr_list_free(vif);
279f438e
PD
757}
758
4e15ee2c
PD
759void xenvif_disconnect_ctrl(struct xenvif *vif)
760{
4e15ee2c 761 if (vif->ctrl_irq) {
c0fcded2 762 xenvif_deinit_hash(vif);
4e15ee2c
PD
763 unbind_from_irqhandler(vif->ctrl_irq, vif);
764 vif->ctrl_irq = 0;
765 }
766
767 if (vif->ctrl.sring) {
768 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
769 vif->ctrl.sring);
770 vif->ctrl.sring = NULL;
771 }
772}
773
8d3d53b3
AB
774/* Reverse the relevant parts of xenvif_init_queue().
775 * Used for queue teardown from xenvif_free(), and on the
776 * error handling paths in xenbus.c:connect().
777 */
778void xenvif_deinit_queue(struct xenvif_queue *queue)
779{
ff4b156f 780 gnttab_free_pages(MAX_PENDING_REQS, queue->mmap_pages);
8d3d53b3
AB
781}
782
279f438e
PD
783void xenvif_free(struct xenvif *vif)
784{
9c6f3ffe 785 struct xenvif_queue *queues = vif->queues;
f7b50c4e 786 unsigned int num_queues = vif->num_queues;
e9ce7cb6 787 unsigned int queue_index;
f53c3fe8 788
e9ce7cb6 789 unregister_netdev(vif->dev);
f942dc25 790 free_netdev(vif->dev);
b103f358 791
9c6f3ffe
DV
792 for (queue_index = 0; queue_index < num_queues; ++queue_index)
793 xenvif_deinit_queue(&queues[queue_index]);
794 vfree(queues);
795
279f438e 796 module_put(THIS_MODULE);
f942dc25 797}