Commit | Line | Data |
---|---|---|
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> | |
e7b599d7 | 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 | 45 | |
f48da8b1 DV |
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 | ||
a64bd934 WL |
49 | /* This function is used to set SKBTX_DEV_ZEROCOPY 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 | */ | |
54 | void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue, | |
55 | struct sk_buff *skb) | |
56 | { | |
57 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
58 | atomic_inc(&queue->inflight_packets); | |
59 | } | |
60 | ||
61 | void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue) | |
62 | { | |
63 | atomic_dec(&queue->inflight_packets); | |
64 | } | |
65 | ||
f942dc25 IC |
66 | int xenvif_schedulable(struct xenvif *vif) |
67 | { | |
3d1af1df | 68 | return netif_running(vif->dev) && |
f48da8b1 DV |
69 | test_bit(VIF_STATUS_CONNECTED, &vif->status) && |
70 | !vif->disabled; | |
f942dc25 IC |
71 | } |
72 | ||
e1f00a69 | 73 | static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id) |
f942dc25 | 74 | { |
e9ce7cb6 | 75 | struct xenvif_queue *queue = dev_id; |
f942dc25 | 76 | |
e9ce7cb6 WL |
77 | if (RING_HAS_UNCONSUMED_REQUESTS(&queue->tx)) |
78 | napi_schedule(&queue->napi); | |
f942dc25 | 79 | |
e1f00a69 WL |
80 | return IRQ_HANDLED; |
81 | } | |
82 | ||
e9ce7cb6 | 83 | int xenvif_poll(struct napi_struct *napi, int budget) |
b3f980bd | 84 | { |
e9ce7cb6 WL |
85 | struct xenvif_queue *queue = |
86 | container_of(napi, struct xenvif_queue, napi); | |
b3f980bd WL |
87 | int work_done; |
88 | ||
e9d8b2c2 WL |
89 | /* This vif is rogue, we pretend we've there is nothing to do |
90 | * for this vif to deschedule it from NAPI. But this interface | |
91 | * will be turned off in thread context later. | |
92 | */ | |
2561cc15 | 93 | if (unlikely(queue->vif->disabled)) { |
e9d8b2c2 WL |
94 | napi_complete(napi); |
95 | return 0; | |
96 | } | |
97 | ||
e9ce7cb6 | 98 | work_done = xenvif_tx_action(queue, budget); |
b3f980bd WL |
99 | |
100 | if (work_done < budget) { | |
0d08fceb | 101 | napi_complete(napi); |
e9ce7cb6 | 102 | xenvif_napi_schedule_or_enable_events(queue); |
b3f980bd WL |
103 | } |
104 | ||
105 | return work_done; | |
106 | } | |
107 | ||
e1f00a69 WL |
108 | static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id) |
109 | { | |
e9ce7cb6 | 110 | struct xenvif_queue *queue = dev_id; |
e1f00a69 | 111 | |
e9ce7cb6 | 112 | xenvif_kick_thread(queue); |
f942dc25 IC |
113 | |
114 | return IRQ_HANDLED; | |
115 | } | |
116 | ||
f51de243 | 117 | irqreturn_t xenvif_interrupt(int irq, void *dev_id) |
e1f00a69 WL |
118 | { |
119 | xenvif_tx_interrupt(irq, dev_id); | |
120 | xenvif_rx_interrupt(irq, dev_id); | |
121 | ||
122 | return IRQ_HANDLED; | |
123 | } | |
124 | ||
e9ce7cb6 WL |
125 | int xenvif_queue_stopped(struct xenvif_queue *queue) |
126 | { | |
127 | struct net_device *dev = queue->vif->dev; | |
128 | unsigned int id = queue->id; | |
129 | return netif_tx_queue_stopped(netdev_get_tx_queue(dev, id)); | |
130 | } | |
131 | ||
132 | void xenvif_wake_queue(struct xenvif_queue *queue) | |
133 | { | |
134 | struct net_device *dev = queue->vif->dev; | |
135 | unsigned int id = queue->id; | |
136 | netif_tx_wake_queue(netdev_get_tx_queue(dev, id)); | |
137 | } | |
138 | ||
f942dc25 IC |
139 | static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev) |
140 | { | |
141 | struct xenvif *vif = netdev_priv(dev); | |
e9ce7cb6 | 142 | struct xenvif_queue *queue = NULL; |
f7b50c4e | 143 | unsigned int num_queues = vif->num_queues; |
e9ce7cb6 | 144 | u16 index; |
f48da8b1 | 145 | struct xenvif_rx_cb *cb; |
f942dc25 IC |
146 | |
147 | BUG_ON(skb->dev != dev); | |
148 | ||
e9ce7cb6 WL |
149 | /* Drop the packet if queues are not set up */ |
150 | if (num_queues < 1) | |
151 | goto drop; | |
152 | ||
153 | /* Obtain the queue to be used to transmit this packet */ | |
154 | index = skb_get_queue_mapping(skb); | |
155 | if (index >= num_queues) { | |
156 | pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n.", | |
157 | index, vif->dev->name); | |
158 | index %= num_queues; | |
159 | } | |
160 | queue = &vif->queues[index]; | |
161 | ||
162 | /* Drop the packet if queue is not ready */ | |
163 | if (queue->task == NULL || | |
164 | queue->dealloc_task == NULL || | |
f53c3fe8 | 165 | !xenvif_schedulable(vif)) |
f942dc25 IC |
166 | goto drop; |
167 | ||
f48da8b1 | 168 | cb = XENVIF_RX_CB(skb); |
26c0e102 | 169 | cb->expires = jiffies + vif->drain_timeout; |
f942dc25 | 170 | |
f48da8b1 | 171 | xenvif_rx_queue_tail(queue, skb); |
e9ce7cb6 | 172 | xenvif_kick_thread(queue); |
f942dc25 IC |
173 | |
174 | return NETDEV_TX_OK; | |
175 | ||
176 | drop: | |
177 | vif->dev->stats.tx_dropped++; | |
178 | dev_kfree_skb(skb); | |
179 | return NETDEV_TX_OK; | |
180 | } | |
181 | ||
f942dc25 IC |
182 | static struct net_device_stats *xenvif_get_stats(struct net_device *dev) |
183 | { | |
184 | struct xenvif *vif = netdev_priv(dev); | |
e9ce7cb6 | 185 | struct xenvif_queue *queue = NULL; |
f7b50c4e | 186 | unsigned int num_queues = vif->num_queues; |
e9ce7cb6 WL |
187 | unsigned long rx_bytes = 0; |
188 | unsigned long rx_packets = 0; | |
189 | unsigned long tx_bytes = 0; | |
190 | unsigned long tx_packets = 0; | |
191 | unsigned int index; | |
192 | ||
193 | if (vif->queues == NULL) | |
194 | goto out; | |
195 | ||
196 | /* Aggregate tx and rx stats from each queue */ | |
197 | for (index = 0; index < num_queues; ++index) { | |
198 | queue = &vif->queues[index]; | |
199 | rx_bytes += queue->stats.rx_bytes; | |
200 | rx_packets += queue->stats.rx_packets; | |
201 | tx_bytes += queue->stats.tx_bytes; | |
202 | tx_packets += queue->stats.tx_packets; | |
203 | } | |
204 | ||
205 | out: | |
206 | vif->dev->stats.rx_bytes = rx_bytes; | |
207 | vif->dev->stats.rx_packets = rx_packets; | |
208 | vif->dev->stats.tx_bytes = tx_bytes; | |
209 | vif->dev->stats.tx_packets = tx_packets; | |
210 | ||
f942dc25 IC |
211 | return &vif->dev->stats; |
212 | } | |
213 | ||
214 | static void xenvif_up(struct xenvif *vif) | |
215 | { | |
e9ce7cb6 | 216 | struct xenvif_queue *queue = NULL; |
f7b50c4e | 217 | unsigned int num_queues = vif->num_queues; |
e9ce7cb6 WL |
218 | unsigned int queue_index; |
219 | ||
220 | for (queue_index = 0; queue_index < num_queues; ++queue_index) { | |
221 | queue = &vif->queues[queue_index]; | |
222 | napi_enable(&queue->napi); | |
223 | enable_irq(queue->tx_irq); | |
224 | if (queue->tx_irq != queue->rx_irq) | |
225 | enable_irq(queue->rx_irq); | |
226 | xenvif_napi_schedule_or_enable_events(queue); | |
227 | } | |
f942dc25 IC |
228 | } |
229 | ||
230 | static void xenvif_down(struct xenvif *vif) | |
231 | { | |
e9ce7cb6 | 232 | struct xenvif_queue *queue = NULL; |
f7b50c4e | 233 | unsigned int num_queues = vif->num_queues; |
e9ce7cb6 WL |
234 | unsigned int queue_index; |
235 | ||
236 | for (queue_index = 0; queue_index < num_queues; ++queue_index) { | |
237 | queue = &vif->queues[queue_index]; | |
e9ce7cb6 WL |
238 | disable_irq(queue->tx_irq); |
239 | if (queue->tx_irq != queue->rx_irq) | |
240 | disable_irq(queue->rx_irq); | |
8fe78989 | 241 | napi_disable(&queue->napi); |
e9ce7cb6 WL |
242 | del_timer_sync(&queue->credit_timeout); |
243 | } | |
f942dc25 IC |
244 | } |
245 | ||
246 | static int xenvif_open(struct net_device *dev) | |
247 | { | |
248 | struct xenvif *vif = netdev_priv(dev); | |
3d1af1df | 249 | if (test_bit(VIF_STATUS_CONNECTED, &vif->status)) |
f942dc25 | 250 | xenvif_up(vif); |
e9ce7cb6 | 251 | netif_tx_start_all_queues(dev); |
f942dc25 IC |
252 | return 0; |
253 | } | |
254 | ||
255 | static int xenvif_close(struct net_device *dev) | |
256 | { | |
257 | struct xenvif *vif = netdev_priv(dev); | |
3d1af1df | 258 | if (test_bit(VIF_STATUS_CONNECTED, &vif->status)) |
f942dc25 | 259 | xenvif_down(vif); |
e9ce7cb6 | 260 | netif_tx_stop_all_queues(dev); |
f942dc25 IC |
261 | return 0; |
262 | } | |
263 | ||
264 | static int xenvif_change_mtu(struct net_device *dev, int mtu) | |
265 | { | |
266 | struct xenvif *vif = netdev_priv(dev); | |
267 | int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN; | |
268 | ||
269 | if (mtu > max) | |
270 | return -EINVAL; | |
271 | dev->mtu = mtu; | |
272 | return 0; | |
273 | } | |
274 | ||
c8f44aff MM |
275 | static netdev_features_t xenvif_fix_features(struct net_device *dev, |
276 | netdev_features_t features) | |
f942dc25 IC |
277 | { |
278 | struct xenvif *vif = netdev_priv(dev); | |
f942dc25 | 279 | |
47103041 MM |
280 | if (!vif->can_sg) |
281 | features &= ~NETIF_F_SG; | |
82cada22 | 282 | if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV4)) |
47103041 | 283 | features &= ~NETIF_F_TSO; |
82cada22 PD |
284 | if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV6)) |
285 | features &= ~NETIF_F_TSO6; | |
146c8a77 | 286 | if (!vif->ip_csum) |
47103041 | 287 | features &= ~NETIF_F_IP_CSUM; |
146c8a77 PD |
288 | if (!vif->ipv6_csum) |
289 | features &= ~NETIF_F_IPV6_CSUM; | |
f942dc25 | 290 | |
47103041 | 291 | return features; |
f942dc25 IC |
292 | } |
293 | ||
294 | static const struct xenvif_stat { | |
295 | char name[ETH_GSTRING_LEN]; | |
296 | u16 offset; | |
297 | } xenvif_stats[] = { | |
298 | { | |
299 | "rx_gso_checksum_fixup", | |
e9ce7cb6 | 300 | offsetof(struct xenvif_stats, rx_gso_checksum_fixup) |
f942dc25 | 301 | }, |
1bb332af ZK |
302 | /* If (sent != success + fail), there are probably packets never |
303 | * freed up properly! | |
304 | */ | |
305 | { | |
306 | "tx_zerocopy_sent", | |
e9ce7cb6 | 307 | offsetof(struct xenvif_stats, tx_zerocopy_sent), |
1bb332af ZK |
308 | }, |
309 | { | |
310 | "tx_zerocopy_success", | |
e9ce7cb6 | 311 | offsetof(struct xenvif_stats, tx_zerocopy_success), |
1bb332af ZK |
312 | }, |
313 | { | |
314 | "tx_zerocopy_fail", | |
e9ce7cb6 | 315 | offsetof(struct xenvif_stats, tx_zerocopy_fail) |
1bb332af | 316 | }, |
e3377f36 ZK |
317 | /* Number of packets exceeding MAX_SKB_FRAG slots. You should use |
318 | * a guest with the same MAX_SKB_FRAG | |
319 | */ | |
320 | { | |
321 | "tx_frag_overflow", | |
e9ce7cb6 | 322 | offsetof(struct xenvif_stats, tx_frag_overflow) |
e3377f36 | 323 | }, |
f942dc25 IC |
324 | }; |
325 | ||
326 | static int xenvif_get_sset_count(struct net_device *dev, int string_set) | |
327 | { | |
328 | switch (string_set) { | |
329 | case ETH_SS_STATS: | |
330 | return ARRAY_SIZE(xenvif_stats); | |
331 | default: | |
332 | return -EINVAL; | |
333 | } | |
334 | } | |
335 | ||
336 | static void xenvif_get_ethtool_stats(struct net_device *dev, | |
337 | struct ethtool_stats *stats, u64 * data) | |
338 | { | |
e9ce7cb6 | 339 | struct xenvif *vif = netdev_priv(dev); |
f7b50c4e | 340 | unsigned int num_queues = vif->num_queues; |
f942dc25 | 341 | int i; |
e9ce7cb6 WL |
342 | unsigned int queue_index; |
343 | struct xenvif_stats *vif_stats; | |
344 | ||
345 | for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) { | |
346 | unsigned long accum = 0; | |
347 | for (queue_index = 0; queue_index < num_queues; ++queue_index) { | |
348 | vif_stats = &vif->queues[queue_index].stats; | |
349 | accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset); | |
350 | } | |
351 | data[i] = accum; | |
352 | } | |
f942dc25 IC |
353 | } |
354 | ||
355 | static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
356 | { | |
357 | int i; | |
358 | ||
359 | switch (stringset) { | |
360 | case ETH_SS_STATS: | |
361 | for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) | |
362 | memcpy(data + i * ETH_GSTRING_LEN, | |
363 | xenvif_stats[i].name, ETH_GSTRING_LEN); | |
364 | break; | |
365 | } | |
366 | } | |
367 | ||
813abbba | 368 | static const struct ethtool_ops xenvif_ethtool_ops = { |
f942dc25 IC |
369 | .get_link = ethtool_op_get_link, |
370 | ||
371 | .get_sset_count = xenvif_get_sset_count, | |
372 | .get_ethtool_stats = xenvif_get_ethtool_stats, | |
373 | .get_strings = xenvif_get_strings, | |
374 | }; | |
375 | ||
813abbba | 376 | static const struct net_device_ops xenvif_netdev_ops = { |
f942dc25 IC |
377 | .ndo_start_xmit = xenvif_start_xmit, |
378 | .ndo_get_stats = xenvif_get_stats, | |
379 | .ndo_open = xenvif_open, | |
380 | .ndo_stop = xenvif_close, | |
381 | .ndo_change_mtu = xenvif_change_mtu, | |
47103041 | 382 | .ndo_fix_features = xenvif_fix_features, |
4a633a60 MW |
383 | .ndo_set_mac_address = eth_mac_addr, |
384 | .ndo_validate_addr = eth_validate_addr, | |
f942dc25 IC |
385 | }; |
386 | ||
387 | struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, | |
388 | unsigned int handle) | |
389 | { | |
390 | int err; | |
391 | struct net_device *dev; | |
392 | struct xenvif *vif; | |
393 | char name[IFNAMSIZ] = {}; | |
394 | ||
395 | snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle); | |
8d3d53b3 AB |
396 | /* Allocate a netdev with the max. supported number of queues. |
397 | * When the guest selects the desired number, it will be updated | |
f7b50c4e | 398 | * via netif_set_real_num_*_queues(). |
8d3d53b3 | 399 | */ |
c835a677 TG |
400 | dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN, |
401 | ether_setup, xenvif_max_queues); | |
f942dc25 | 402 | if (dev == NULL) { |
b3f980bd | 403 | pr_warn("Could not allocate netdev for %s\n", name); |
f942dc25 IC |
404 | return ERR_PTR(-ENOMEM); |
405 | } | |
406 | ||
407 | SET_NETDEV_DEV(dev, parent); | |
408 | ||
409 | vif = netdev_priv(dev); | |
ac3d5ac2 | 410 | |
f942dc25 IC |
411 | vif->domid = domid; |
412 | vif->handle = handle; | |
f942dc25 | 413 | vif->can_sg = 1; |
146c8a77 | 414 | vif->ip_csum = 1; |
f942dc25 | 415 | vif->dev = dev; |
e9d8b2c2 | 416 | vif->disabled = false; |
26c0e102 DV |
417 | vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs); |
418 | vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs); | |
e9d8b2c2 | 419 | |
f7b50c4e | 420 | /* Start out with no queues. */ |
e9ce7cb6 | 421 | vif->queues = NULL; |
f7b50c4e | 422 | vif->num_queues = 0; |
09350788 | 423 | |
ecf08d2d DV |
424 | spin_lock_init(&vif->lock); |
425 | ||
f942dc25 | 426 | dev->netdev_ops = &xenvif_netdev_ops; |
146c8a77 PD |
427 | dev->hw_features = NETIF_F_SG | |
428 | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | | |
82cada22 | 429 | NETIF_F_TSO | NETIF_F_TSO6; |
7365bcfa | 430 | dev->features = dev->hw_features | NETIF_F_RXCSUM; |
7ad24ea4 | 431 | dev->ethtool_ops = &xenvif_ethtool_ops; |
f942dc25 IC |
432 | |
433 | dev->tx_queue_len = XENVIF_QUEUE_LENGTH; | |
434 | ||
435 | /* | |
436 | * Initialise a dummy MAC address. We choose the numerically | |
437 | * largest non-broadcast address to prevent the address getting | |
438 | * stolen by an Ethernet bridge for STP purposes. | |
439 | * (FE:FF:FF:FF:FF:FF) | |
440 | */ | |
441 | memset(dev->dev_addr, 0xFF, ETH_ALEN); | |
442 | dev->dev_addr[0] &= ~0x01; | |
443 | ||
444 | netif_carrier_off(dev); | |
445 | ||
446 | err = register_netdev(dev); | |
447 | if (err) { | |
448 | netdev_warn(dev, "Could not register device: err=%d\n", err); | |
449 | free_netdev(dev); | |
450 | return ERR_PTR(err); | |
451 | } | |
452 | ||
453 | netdev_dbg(dev, "Successfully created xenvif\n"); | |
279f438e PD |
454 | |
455 | __module_get(THIS_MODULE); | |
456 | ||
f942dc25 IC |
457 | return vif; |
458 | } | |
459 | ||
e9ce7cb6 WL |
460 | int xenvif_init_queue(struct xenvif_queue *queue) |
461 | { | |
462 | int err, i; | |
463 | ||
464 | queue->credit_bytes = queue->remaining_credit = ~0UL; | |
465 | queue->credit_usec = 0UL; | |
466 | init_timer(&queue->credit_timeout); | |
467 | queue->credit_window_start = get_jiffies_64(); | |
468 | ||
f48da8b1 DV |
469 | queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES; |
470 | ||
e9ce7cb6 WL |
471 | skb_queue_head_init(&queue->rx_queue); |
472 | skb_queue_head_init(&queue->tx_queue); | |
473 | ||
474 | queue->pending_cons = 0; | |
475 | queue->pending_prod = MAX_PENDING_REQS; | |
476 | for (i = 0; i < MAX_PENDING_REQS; ++i) | |
477 | queue->pending_ring[i] = i; | |
478 | ||
479 | spin_lock_init(&queue->callback_lock); | |
480 | spin_lock_init(&queue->response_lock); | |
481 | ||
482 | /* If ballooning is disabled, this will consume real memory, so you | |
483 | * better enable it. The long term solution would be to use just a | |
484 | * bunch of valid page descriptors, without dependency on ballooning | |
485 | */ | |
486 | err = alloc_xenballooned_pages(MAX_PENDING_REQS, | |
487 | queue->mmap_pages, | |
488 | false); | |
489 | if (err) { | |
490 | netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n"); | |
491 | return -ENOMEM; | |
492 | } | |
493 | ||
494 | for (i = 0; i < MAX_PENDING_REQS; i++) { | |
495 | queue->pending_tx_info[i].callback_struct = (struct ubuf_info) | |
496 | { .callback = xenvif_zerocopy_callback, | |
497 | .ctx = NULL, | |
498 | .desc = i }; | |
499 | queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE; | |
500 | } | |
501 | ||
e9ce7cb6 WL |
502 | return 0; |
503 | } | |
504 | ||
505 | void xenvif_carrier_on(struct xenvif *vif) | |
506 | { | |
507 | rtnl_lock(); | |
508 | if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN) | |
509 | dev_set_mtu(vif->dev, ETH_DATA_LEN); | |
510 | netdev_update_features(vif->dev); | |
3d1af1df | 511 | set_bit(VIF_STATUS_CONNECTED, &vif->status); |
e9ce7cb6 WL |
512 | if (netif_running(vif->dev)) |
513 | xenvif_up(vif); | |
514 | rtnl_unlock(); | |
515 | } | |
516 | ||
517 | int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref, | |
e1f00a69 WL |
518 | unsigned long rx_ring_ref, unsigned int tx_evtchn, |
519 | unsigned int rx_evtchn) | |
f942dc25 | 520 | { |
67fa3660 | 521 | struct task_struct *task; |
f942dc25 IC |
522 | int err = -ENOMEM; |
523 | ||
e9ce7cb6 WL |
524 | BUG_ON(queue->tx_irq); |
525 | BUG_ON(queue->task); | |
526 | BUG_ON(queue->dealloc_task); | |
f942dc25 | 527 | |
e9ce7cb6 | 528 | err = xenvif_map_frontend_rings(queue, tx_ring_ref, rx_ring_ref); |
f942dc25 IC |
529 | if (err < 0) |
530 | goto err; | |
531 | ||
e9ce7cb6 WL |
532 | init_waitqueue_head(&queue->wq); |
533 | init_waitqueue_head(&queue->dealloc_wq); | |
a64bd934 | 534 | atomic_set(&queue->inflight_packets, 0); |
ca2f09f2 | 535 | |
e24f8191 WL |
536 | netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll, |
537 | XENVIF_NAPI_WEIGHT); | |
538 | ||
e1f00a69 WL |
539 | if (tx_evtchn == rx_evtchn) { |
540 | /* feature-split-event-channels == 0 */ | |
541 | err = bind_interdomain_evtchn_to_irqhandler( | |
e9ce7cb6 WL |
542 | queue->vif->domid, tx_evtchn, xenvif_interrupt, 0, |
543 | queue->name, queue); | |
e1f00a69 WL |
544 | if (err < 0) |
545 | goto err_unmap; | |
e9ce7cb6 WL |
546 | queue->tx_irq = queue->rx_irq = err; |
547 | disable_irq(queue->tx_irq); | |
e1f00a69 WL |
548 | } else { |
549 | /* feature-split-event-channels == 1 */ | |
e9ce7cb6 WL |
550 | snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), |
551 | "%s-tx", queue->name); | |
e1f00a69 | 552 | err = bind_interdomain_evtchn_to_irqhandler( |
e9ce7cb6 WL |
553 | queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0, |
554 | queue->tx_irq_name, queue); | |
e1f00a69 WL |
555 | if (err < 0) |
556 | goto err_unmap; | |
e9ce7cb6 WL |
557 | queue->tx_irq = err; |
558 | disable_irq(queue->tx_irq); | |
e1f00a69 | 559 | |
e9ce7cb6 WL |
560 | snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), |
561 | "%s-rx", queue->name); | |
e1f00a69 | 562 | err = bind_interdomain_evtchn_to_irqhandler( |
e9ce7cb6 WL |
563 | queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0, |
564 | queue->rx_irq_name, queue); | |
e1f00a69 WL |
565 | if (err < 0) |
566 | goto err_tx_unbind; | |
e9ce7cb6 WL |
567 | queue->rx_irq = err; |
568 | disable_irq(queue->rx_irq); | |
e1f00a69 | 569 | } |
f942dc25 | 570 | |
ecf08d2d DV |
571 | queue->stalled = true; |
572 | ||
121fa4b7 | 573 | task = kthread_create(xenvif_kthread_guest_rx, |
e9ce7cb6 | 574 | (void *)queue, "%s-guest-rx", queue->name); |
67fa3660 | 575 | if (IS_ERR(task)) { |
e9ce7cb6 | 576 | pr_warn("Could not allocate kthread for %s\n", queue->name); |
67fa3660 | 577 | err = PTR_ERR(task); |
b3f980bd WL |
578 | goto err_rx_unbind; |
579 | } | |
e9ce7cb6 | 580 | queue->task = task; |
67fa3660 | 581 | |
f53c3fe8 | 582 | task = kthread_create(xenvif_dealloc_kthread, |
e9ce7cb6 | 583 | (void *)queue, "%s-dealloc", queue->name); |
f53c3fe8 | 584 | if (IS_ERR(task)) { |
e9ce7cb6 | 585 | pr_warn("Could not allocate kthread for %s\n", queue->name); |
f53c3fe8 ZK |
586 | err = PTR_ERR(task); |
587 | goto err_rx_unbind; | |
588 | } | |
e9ce7cb6 | 589 | queue->dealloc_task = task; |
f53c3fe8 | 590 | |
e9ce7cb6 WL |
591 | wake_up_process(queue->task); |
592 | wake_up_process(queue->dealloc_task); | |
b3f980bd | 593 | |
f942dc25 | 594 | return 0; |
b3f980bd WL |
595 | |
596 | err_rx_unbind: | |
e9ce7cb6 WL |
597 | unbind_from_irqhandler(queue->rx_irq, queue); |
598 | queue->rx_irq = 0; | |
e1f00a69 | 599 | err_tx_unbind: |
e9ce7cb6 WL |
600 | unbind_from_irqhandler(queue->tx_irq, queue); |
601 | queue->tx_irq = 0; | |
f942dc25 | 602 | err_unmap: |
e9ce7cb6 | 603 | xenvif_unmap_frontend_rings(queue); |
f942dc25 | 604 | err: |
b103f358 | 605 | module_put(THIS_MODULE); |
f942dc25 IC |
606 | return err; |
607 | } | |
608 | ||
48856286 | 609 | void xenvif_carrier_off(struct xenvif *vif) |
f942dc25 IC |
610 | { |
611 | struct net_device *dev = vif->dev; | |
48856286 IC |
612 | |
613 | rtnl_lock(); | |
3d1af1df ZK |
614 | if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) { |
615 | netif_carrier_off(dev); /* discard queued packets */ | |
616 | if (netif_running(dev)) | |
617 | xenvif_down(vif); | |
618 | } | |
48856286 | 619 | rtnl_unlock(); |
48856286 IC |
620 | } |
621 | ||
622 | void xenvif_disconnect(struct xenvif *vif) | |
623 | { | |
e9ce7cb6 | 624 | struct xenvif_queue *queue = NULL; |
f7b50c4e | 625 | unsigned int num_queues = vif->num_queues; |
e9ce7cb6 WL |
626 | unsigned int queue_index; |
627 | ||
3d1af1df | 628 | xenvif_carrier_off(vif); |
f942dc25 | 629 | |
e9ce7cb6 WL |
630 | for (queue_index = 0; queue_index < num_queues; ++queue_index) { |
631 | queue = &vif->queues[queue_index]; | |
db739ef3 | 632 | |
ea2c5e13 WL |
633 | netif_napi_del(&queue->napi); |
634 | ||
e9ce7cb6 | 635 | if (queue->task) { |
e9ce7cb6 WL |
636 | kthread_stop(queue->task); |
637 | queue->task = NULL; | |
638 | } | |
f53c3fe8 | 639 | |
e9ce7cb6 WL |
640 | if (queue->dealloc_task) { |
641 | kthread_stop(queue->dealloc_task); | |
642 | queue->dealloc_task = NULL; | |
643 | } | |
644 | ||
645 | if (queue->tx_irq) { | |
646 | if (queue->tx_irq == queue->rx_irq) | |
647 | unbind_from_irqhandler(queue->tx_irq, queue); | |
648 | else { | |
649 | unbind_from_irqhandler(queue->tx_irq, queue); | |
650 | unbind_from_irqhandler(queue->rx_irq, queue); | |
651 | } | |
652 | queue->tx_irq = 0; | |
e1f00a69 | 653 | } |
f942dc25 | 654 | |
e9ce7cb6 WL |
655 | xenvif_unmap_frontend_rings(queue); |
656 | } | |
279f438e PD |
657 | } |
658 | ||
8d3d53b3 AB |
659 | /* Reverse the relevant parts of xenvif_init_queue(). |
660 | * Used for queue teardown from xenvif_free(), and on the | |
661 | * error handling paths in xenbus.c:connect(). | |
662 | */ | |
663 | void xenvif_deinit_queue(struct xenvif_queue *queue) | |
664 | { | |
665 | free_xenballooned_pages(MAX_PENDING_REQS, queue->mmap_pages); | |
8d3d53b3 AB |
666 | } |
667 | ||
279f438e PD |
668 | void xenvif_free(struct xenvif *vif) |
669 | { | |
e9ce7cb6 | 670 | struct xenvif_queue *queue = NULL; |
f7b50c4e | 671 | unsigned int num_queues = vif->num_queues; |
e9ce7cb6 | 672 | unsigned int queue_index; |
f53c3fe8 | 673 | |
e9ce7cb6 | 674 | unregister_netdev(vif->dev); |
f53c3fe8 | 675 | |
e9ce7cb6 WL |
676 | for (queue_index = 0; queue_index < num_queues; ++queue_index) { |
677 | queue = &vif->queues[queue_index]; | |
8d3d53b3 | 678 | xenvif_deinit_queue(queue); |
e9ce7cb6 WL |
679 | } |
680 | ||
e9ce7cb6 WL |
681 | vfree(vif->queues); |
682 | vif->queues = NULL; | |
f7b50c4e | 683 | vif->num_queues = 0; |
f942dc25 | 684 | |
f942dc25 | 685 | free_netdev(vif->dev); |
b103f358 | 686 | |
279f438e | 687 | module_put(THIS_MODULE); |
f942dc25 | 688 | } |