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0d160211 JF |
1 | /* |
2 | * Virtual network driver for conversing with remote driver backends. | |
3 | * | |
4 | * Copyright (c) 2002-2005, K A Fraser | |
5 | * Copyright (c) 2005, XenSource Ltd | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version 2 | |
9 | * as published by the Free Software Foundation; or, when distributed | |
10 | * separately from the Linux kernel or incorporated into other | |
11 | * software packages, subject to the following license: | |
12 | * | |
13 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
14 | * of this source file (the "Software"), to deal in the Software without | |
15 | * restriction, including without limitation the rights to use, copy, modify, | |
16 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
17 | * and to permit persons to whom the Software is furnished to do so, subject to | |
18 | * the following conditions: | |
19 | * | |
20 | * The above copyright notice and this permission notice shall be included in | |
21 | * all copies or substantial portions of the Software. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
29 | * IN THE SOFTWARE. | |
30 | */ | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/etherdevice.h> | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/ethtool.h> | |
38 | #include <linux/if_ether.h> | |
39 | #include <linux/tcp.h> | |
40 | #include <linux/udp.h> | |
41 | #include <linux/moduleparam.h> | |
42 | #include <linux/mm.h> | |
43 | #include <net/ip.h> | |
44 | ||
45 | #include <xen/xenbus.h> | |
46 | #include <xen/events.h> | |
47 | #include <xen/page.h> | |
48 | #include <xen/grant_table.h> | |
49 | ||
50 | #include <xen/interface/io/netif.h> | |
51 | #include <xen/interface/memory.h> | |
52 | #include <xen/interface/grant_table.h> | |
53 | ||
54 | static struct ethtool_ops xennet_ethtool_ops; | |
55 | ||
56 | struct netfront_cb { | |
57 | struct page *page; | |
58 | unsigned offset; | |
59 | }; | |
60 | ||
61 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) | |
62 | ||
63 | #define RX_COPY_THRESHOLD 256 | |
64 | ||
65 | #define GRANT_INVALID_REF 0 | |
66 | ||
67 | #define NET_TX_RING_SIZE __RING_SIZE((struct xen_netif_tx_sring *)0, PAGE_SIZE) | |
68 | #define NET_RX_RING_SIZE __RING_SIZE((struct xen_netif_rx_sring *)0, PAGE_SIZE) | |
69 | #define TX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | |
70 | ||
71 | struct netfront_info { | |
72 | struct list_head list; | |
73 | struct net_device *netdev; | |
74 | ||
75 | struct net_device_stats stats; | |
76 | ||
77 | struct xen_netif_tx_front_ring tx; | |
78 | struct xen_netif_rx_front_ring rx; | |
79 | ||
80 | spinlock_t tx_lock; | |
81 | spinlock_t rx_lock; | |
82 | ||
83 | unsigned int evtchn; | |
84 | ||
85 | /* Receive-ring batched refills. */ | |
86 | #define RX_MIN_TARGET 8 | |
87 | #define RX_DFL_MIN_TARGET 64 | |
88 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | |
89 | unsigned rx_min_target, rx_max_target, rx_target; | |
90 | struct sk_buff_head rx_batch; | |
91 | ||
92 | struct timer_list rx_refill_timer; | |
93 | ||
94 | /* | |
95 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries | |
96 | * are linked from tx_skb_freelist through skb_entry.link. | |
97 | * | |
98 | * NB. Freelist index entries are always going to be less than | |
99 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or | |
100 | * greater than PAGE_OFFSET: we use this property to distinguish | |
101 | * them. | |
102 | */ | |
103 | union skb_entry { | |
104 | struct sk_buff *skb; | |
105 | unsigned link; | |
106 | } tx_skbs[NET_TX_RING_SIZE]; | |
107 | grant_ref_t gref_tx_head; | |
108 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | |
109 | unsigned tx_skb_freelist; | |
110 | ||
111 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; | |
112 | grant_ref_t gref_rx_head; | |
113 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; | |
114 | ||
115 | struct xenbus_device *xbdev; | |
116 | int tx_ring_ref; | |
117 | int rx_ring_ref; | |
118 | ||
119 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; | |
120 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; | |
121 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; | |
122 | }; | |
123 | ||
124 | struct netfront_rx_info { | |
125 | struct xen_netif_rx_response rx; | |
126 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; | |
127 | }; | |
128 | ||
129 | /* | |
130 | * Access macros for acquiring freeing slots in tx_skbs[]. | |
131 | */ | |
132 | ||
133 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, | |
134 | unsigned short id) | |
135 | { | |
136 | list[id].link = *head; | |
137 | *head = id; | |
138 | } | |
139 | ||
140 | static unsigned short get_id_from_freelist(unsigned *head, | |
141 | union skb_entry *list) | |
142 | { | |
143 | unsigned int id = *head; | |
144 | *head = list[id].link; | |
145 | return id; | |
146 | } | |
147 | ||
148 | static int xennet_rxidx(RING_IDX idx) | |
149 | { | |
150 | return idx & (NET_RX_RING_SIZE - 1); | |
151 | } | |
152 | ||
153 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, | |
154 | RING_IDX ri) | |
155 | { | |
156 | int i = xennet_rxidx(ri); | |
157 | struct sk_buff *skb = np->rx_skbs[i]; | |
158 | np->rx_skbs[i] = NULL; | |
159 | return skb; | |
160 | } | |
161 | ||
162 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, | |
163 | RING_IDX ri) | |
164 | { | |
165 | int i = xennet_rxidx(ri); | |
166 | grant_ref_t ref = np->grant_rx_ref[i]; | |
167 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
168 | return ref; | |
169 | } | |
170 | ||
171 | #ifdef CONFIG_SYSFS | |
172 | static int xennet_sysfs_addif(struct net_device *netdev); | |
173 | static void xennet_sysfs_delif(struct net_device *netdev); | |
174 | #else /* !CONFIG_SYSFS */ | |
175 | #define xennet_sysfs_addif(dev) (0) | |
176 | #define xennet_sysfs_delif(dev) do { } while (0) | |
177 | #endif | |
178 | ||
179 | static int xennet_can_sg(struct net_device *dev) | |
180 | { | |
181 | return dev->features & NETIF_F_SG; | |
182 | } | |
183 | ||
184 | ||
185 | static void rx_refill_timeout(unsigned long data) | |
186 | { | |
187 | struct net_device *dev = (struct net_device *)data; | |
188 | netif_rx_schedule(dev); | |
189 | } | |
190 | ||
191 | static int netfront_tx_slot_available(struct netfront_info *np) | |
192 | { | |
193 | return ((np->tx.req_prod_pvt - np->tx.rsp_cons) < | |
194 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2)); | |
195 | } | |
196 | ||
197 | static void xennet_maybe_wake_tx(struct net_device *dev) | |
198 | { | |
199 | struct netfront_info *np = netdev_priv(dev); | |
200 | ||
201 | if (unlikely(netif_queue_stopped(dev)) && | |
202 | netfront_tx_slot_available(np) && | |
203 | likely(netif_running(dev))) | |
204 | netif_wake_queue(dev); | |
205 | } | |
206 | ||
207 | static void xennet_alloc_rx_buffers(struct net_device *dev) | |
208 | { | |
209 | unsigned short id; | |
210 | struct netfront_info *np = netdev_priv(dev); | |
211 | struct sk_buff *skb; | |
212 | struct page *page; | |
213 | int i, batch_target, notify; | |
214 | RING_IDX req_prod = np->rx.req_prod_pvt; | |
215 | struct xen_memory_reservation reservation; | |
216 | grant_ref_t ref; | |
217 | unsigned long pfn; | |
218 | void *vaddr; | |
219 | int nr_flips; | |
220 | struct xen_netif_rx_request *req; | |
221 | ||
222 | if (unlikely(!netif_carrier_ok(dev))) | |
223 | return; | |
224 | ||
225 | /* | |
226 | * Allocate skbuffs greedily, even though we batch updates to the | |
227 | * receive ring. This creates a less bursty demand on the memory | |
228 | * allocator, so should reduce the chance of failed allocation requests | |
229 | * both for ourself and for other kernel subsystems. | |
230 | */ | |
231 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); | |
232 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { | |
233 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD, | |
234 | GFP_ATOMIC | __GFP_NOWARN); | |
235 | if (unlikely(!skb)) | |
236 | goto no_skb; | |
237 | ||
238 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); | |
239 | if (!page) { | |
240 | kfree_skb(skb); | |
241 | no_skb: | |
242 | /* Any skbuffs queued for refill? Force them out. */ | |
243 | if (i != 0) | |
244 | goto refill; | |
245 | /* Could not allocate any skbuffs. Try again later. */ | |
246 | mod_timer(&np->rx_refill_timer, | |
247 | jiffies + (HZ/10)); | |
248 | break; | |
249 | } | |
250 | ||
251 | skb_shinfo(skb)->frags[0].page = page; | |
252 | skb_shinfo(skb)->nr_frags = 1; | |
253 | __skb_queue_tail(&np->rx_batch, skb); | |
254 | } | |
255 | ||
256 | /* Is the batch large enough to be worthwhile? */ | |
257 | if (i < (np->rx_target/2)) { | |
258 | if (req_prod > np->rx.sring->req_prod) | |
259 | goto push; | |
260 | return; | |
261 | } | |
262 | ||
263 | /* Adjust our fill target if we risked running out of buffers. */ | |
264 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && | |
265 | ((np->rx_target *= 2) > np->rx_max_target)) | |
266 | np->rx_target = np->rx_max_target; | |
267 | ||
268 | refill: | |
269 | for (nr_flips = i = 0; ; i++) { | |
270 | skb = __skb_dequeue(&np->rx_batch); | |
271 | if (skb == NULL) | |
272 | break; | |
273 | ||
274 | skb->dev = dev; | |
275 | ||
276 | id = xennet_rxidx(req_prod + i); | |
277 | ||
278 | BUG_ON(np->rx_skbs[id]); | |
279 | np->rx_skbs[id] = skb; | |
280 | ||
281 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); | |
282 | BUG_ON((signed short)ref < 0); | |
283 | np->grant_rx_ref[id] = ref; | |
284 | ||
285 | pfn = page_to_pfn(skb_shinfo(skb)->frags[0].page); | |
286 | vaddr = page_address(skb_shinfo(skb)->frags[0].page); | |
287 | ||
288 | req = RING_GET_REQUEST(&np->rx, req_prod + i); | |
289 | gnttab_grant_foreign_access_ref(ref, | |
290 | np->xbdev->otherend_id, | |
291 | pfn_to_mfn(pfn), | |
292 | 0); | |
293 | ||
294 | req->id = id; | |
295 | req->gref = ref; | |
296 | } | |
297 | ||
298 | if (nr_flips != 0) { | |
299 | reservation.extent_start = np->rx_pfn_array; | |
300 | reservation.nr_extents = nr_flips; | |
301 | reservation.extent_order = 0; | |
302 | reservation.address_bits = 0; | |
303 | reservation.domid = DOMID_SELF; | |
304 | ||
305 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
306 | /* After all PTEs have been zapped, flush the TLB. */ | |
307 | np->rx_mcl[i-1].args[MULTI_UVMFLAGS_INDEX] = | |
308 | UVMF_TLB_FLUSH|UVMF_ALL; | |
309 | ||
310 | /* Give away a batch of pages. */ | |
311 | np->rx_mcl[i].op = __HYPERVISOR_memory_op; | |
312 | np->rx_mcl[i].args[0] = XENMEM_decrease_reservation; | |
313 | np->rx_mcl[i].args[1] = (unsigned long)&reservation; | |
314 | ||
315 | /* Zap PTEs and give away pages in one big | |
316 | * multicall. */ | |
317 | (void)HYPERVISOR_multicall(np->rx_mcl, i+1); | |
318 | ||
319 | /* Check return status of HYPERVISOR_memory_op(). */ | |
320 | if (unlikely(np->rx_mcl[i].result != i)) | |
321 | panic("Unable to reduce memory reservation\n"); | |
322 | } else { | |
323 | if (HYPERVISOR_memory_op(XENMEM_decrease_reservation, | |
324 | &reservation) != i) | |
325 | panic("Unable to reduce memory reservation\n"); | |
326 | } | |
327 | } else { | |
328 | wmb(); /* barrier so backend seens requests */ | |
329 | } | |
330 | ||
331 | /* Above is a suitable barrier to ensure backend will see requests. */ | |
332 | np->rx.req_prod_pvt = req_prod + i; | |
333 | push: | |
334 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); | |
335 | if (notify) | |
336 | notify_remote_via_irq(np->netdev->irq); | |
337 | } | |
338 | ||
339 | static int xennet_open(struct net_device *dev) | |
340 | { | |
341 | struct netfront_info *np = netdev_priv(dev); | |
342 | ||
343 | memset(&np->stats, 0, sizeof(np->stats)); | |
344 | ||
345 | spin_lock_bh(&np->rx_lock); | |
346 | if (netif_carrier_ok(dev)) { | |
347 | xennet_alloc_rx_buffers(dev); | |
348 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; | |
349 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
350 | netif_rx_schedule(dev); | |
351 | } | |
352 | spin_unlock_bh(&np->rx_lock); | |
353 | ||
354 | xennet_maybe_wake_tx(dev); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | static void xennet_tx_buf_gc(struct net_device *dev) | |
360 | { | |
361 | RING_IDX cons, prod; | |
362 | unsigned short id; | |
363 | struct netfront_info *np = netdev_priv(dev); | |
364 | struct sk_buff *skb; | |
365 | ||
366 | BUG_ON(!netif_carrier_ok(dev)); | |
367 | ||
368 | do { | |
369 | prod = np->tx.sring->rsp_prod; | |
370 | rmb(); /* Ensure we see responses up to 'rp'. */ | |
371 | ||
372 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { | |
373 | struct xen_netif_tx_response *txrsp; | |
374 | ||
375 | txrsp = RING_GET_RESPONSE(&np->tx, cons); | |
376 | if (txrsp->status == NETIF_RSP_NULL) | |
377 | continue; | |
378 | ||
379 | id = txrsp->id; | |
380 | skb = np->tx_skbs[id].skb; | |
381 | if (unlikely(gnttab_query_foreign_access( | |
382 | np->grant_tx_ref[id]) != 0)) { | |
383 | printk(KERN_ALERT "xennet_tx_buf_gc: warning " | |
384 | "-- grant still in use by backend " | |
385 | "domain.\n"); | |
386 | BUG(); | |
387 | } | |
388 | gnttab_end_foreign_access_ref( | |
389 | np->grant_tx_ref[id], GNTMAP_readonly); | |
390 | gnttab_release_grant_reference( | |
391 | &np->gref_tx_head, np->grant_tx_ref[id]); | |
392 | np->grant_tx_ref[id] = GRANT_INVALID_REF; | |
393 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); | |
394 | dev_kfree_skb_irq(skb); | |
395 | } | |
396 | ||
397 | np->tx.rsp_cons = prod; | |
398 | ||
399 | /* | |
400 | * Set a new event, then check for race with update of tx_cons. | |
401 | * Note that it is essential to schedule a callback, no matter | |
402 | * how few buffers are pending. Even if there is space in the | |
403 | * transmit ring, higher layers may be blocked because too much | |
404 | * data is outstanding: in such cases notification from Xen is | |
405 | * likely to be the only kick that we'll get. | |
406 | */ | |
407 | np->tx.sring->rsp_event = | |
408 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; | |
409 | mb(); /* update shared area */ | |
410 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); | |
411 | ||
412 | xennet_maybe_wake_tx(dev); | |
413 | } | |
414 | ||
415 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, | |
416 | struct xen_netif_tx_request *tx) | |
417 | { | |
418 | struct netfront_info *np = netdev_priv(dev); | |
419 | char *data = skb->data; | |
420 | unsigned long mfn; | |
421 | RING_IDX prod = np->tx.req_prod_pvt; | |
422 | int frags = skb_shinfo(skb)->nr_frags; | |
423 | unsigned int offset = offset_in_page(data); | |
424 | unsigned int len = skb_headlen(skb); | |
425 | unsigned int id; | |
426 | grant_ref_t ref; | |
427 | int i; | |
428 | ||
429 | /* While the header overlaps a page boundary (including being | |
430 | larger than a page), split it it into page-sized chunks. */ | |
431 | while (len > PAGE_SIZE - offset) { | |
432 | tx->size = PAGE_SIZE - offset; | |
433 | tx->flags |= NETTXF_more_data; | |
434 | len -= tx->size; | |
435 | data += tx->size; | |
436 | offset = 0; | |
437 | ||
438 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
439 | np->tx_skbs[id].skb = skb_get(skb); | |
440 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
441 | tx->id = id; | |
442 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
443 | BUG_ON((signed short)ref < 0); | |
444 | ||
445 | mfn = virt_to_mfn(data); | |
446 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
447 | mfn, GNTMAP_readonly); | |
448 | ||
449 | tx->gref = np->grant_tx_ref[id] = ref; | |
450 | tx->offset = offset; | |
451 | tx->size = len; | |
452 | tx->flags = 0; | |
453 | } | |
454 | ||
455 | /* Grant backend access to each skb fragment page. */ | |
456 | for (i = 0; i < frags; i++) { | |
457 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
458 | ||
459 | tx->flags |= NETTXF_more_data; | |
460 | ||
461 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
462 | np->tx_skbs[id].skb = skb_get(skb); | |
463 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
464 | tx->id = id; | |
465 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
466 | BUG_ON((signed short)ref < 0); | |
467 | ||
468 | mfn = pfn_to_mfn(page_to_pfn(frag->page)); | |
469 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
470 | mfn, GNTMAP_readonly); | |
471 | ||
472 | tx->gref = np->grant_tx_ref[id] = ref; | |
473 | tx->offset = frag->page_offset; | |
474 | tx->size = frag->size; | |
475 | tx->flags = 0; | |
476 | } | |
477 | ||
478 | np->tx.req_prod_pvt = prod; | |
479 | } | |
480 | ||
481 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
482 | { | |
483 | unsigned short id; | |
484 | struct netfront_info *np = netdev_priv(dev); | |
485 | struct xen_netif_tx_request *tx; | |
486 | struct xen_netif_extra_info *extra; | |
487 | char *data = skb->data; | |
488 | RING_IDX i; | |
489 | grant_ref_t ref; | |
490 | unsigned long mfn; | |
491 | int notify; | |
492 | int frags = skb_shinfo(skb)->nr_frags; | |
493 | unsigned int offset = offset_in_page(data); | |
494 | unsigned int len = skb_headlen(skb); | |
495 | ||
496 | frags += (offset + len + PAGE_SIZE - 1) / PAGE_SIZE; | |
497 | if (unlikely(frags > MAX_SKB_FRAGS + 1)) { | |
498 | printk(KERN_ALERT "xennet: skb rides the rocket: %d frags\n", | |
499 | frags); | |
500 | dump_stack(); | |
501 | goto drop; | |
502 | } | |
503 | ||
504 | spin_lock_irq(&np->tx_lock); | |
505 | ||
506 | if (unlikely(!netif_carrier_ok(dev) || | |
507 | (frags > 1 && !xennet_can_sg(dev)) || | |
508 | netif_needs_gso(dev, skb))) { | |
509 | spin_unlock_irq(&np->tx_lock); | |
510 | goto drop; | |
511 | } | |
512 | ||
513 | i = np->tx.req_prod_pvt; | |
514 | ||
515 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
516 | np->tx_skbs[id].skb = skb; | |
517 | ||
518 | tx = RING_GET_REQUEST(&np->tx, i); | |
519 | ||
520 | tx->id = id; | |
521 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
522 | BUG_ON((signed short)ref < 0); | |
523 | mfn = virt_to_mfn(data); | |
524 | gnttab_grant_foreign_access_ref( | |
525 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | |
526 | tx->gref = np->grant_tx_ref[id] = ref; | |
527 | tx->offset = offset; | |
528 | tx->size = len; | |
529 | extra = NULL; | |
530 | ||
531 | tx->flags = 0; | |
532 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
533 | /* local packet? */ | |
534 | tx->flags |= NETTXF_csum_blank | NETTXF_data_validated; | |
535 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) | |
536 | /* remote but checksummed. */ | |
537 | tx->flags |= NETTXF_data_validated; | |
538 | ||
539 | if (skb_shinfo(skb)->gso_size) { | |
540 | struct xen_netif_extra_info *gso; | |
541 | ||
542 | gso = (struct xen_netif_extra_info *) | |
543 | RING_GET_REQUEST(&np->tx, ++i); | |
544 | ||
545 | if (extra) | |
546 | extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; | |
547 | else | |
548 | tx->flags |= NETTXF_extra_info; | |
549 | ||
550 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
551 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; | |
552 | gso->u.gso.pad = 0; | |
553 | gso->u.gso.features = 0; | |
554 | ||
555 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
556 | gso->flags = 0; | |
557 | extra = gso; | |
558 | } | |
559 | ||
560 | np->tx.req_prod_pvt = i + 1; | |
561 | ||
562 | xennet_make_frags(skb, dev, tx); | |
563 | tx->size = skb->len; | |
564 | ||
565 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | |
566 | if (notify) | |
567 | notify_remote_via_irq(np->netdev->irq); | |
568 | ||
569 | xennet_tx_buf_gc(dev); | |
570 | ||
571 | if (!netfront_tx_slot_available(np)) | |
572 | netif_stop_queue(dev); | |
573 | ||
574 | spin_unlock_irq(&np->tx_lock); | |
575 | ||
576 | np->stats.tx_bytes += skb->len; | |
577 | np->stats.tx_packets++; | |
578 | ||
579 | return 0; | |
580 | ||
581 | drop: | |
582 | np->stats.tx_dropped++; | |
583 | dev_kfree_skb(skb); | |
584 | return 0; | |
585 | } | |
586 | ||
587 | static int xennet_close(struct net_device *dev) | |
588 | { | |
589 | struct netfront_info *np = netdev_priv(dev); | |
590 | netif_stop_queue(np->netdev); | |
591 | return 0; | |
592 | } | |
593 | ||
594 | static struct net_device_stats *xennet_get_stats(struct net_device *dev) | |
595 | { | |
596 | struct netfront_info *np = netdev_priv(dev); | |
597 | return &np->stats; | |
598 | } | |
599 | ||
600 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, | |
601 | grant_ref_t ref) | |
602 | { | |
603 | int new = xennet_rxidx(np->rx.req_prod_pvt); | |
604 | ||
605 | BUG_ON(np->rx_skbs[new]); | |
606 | np->rx_skbs[new] = skb; | |
607 | np->grant_rx_ref[new] = ref; | |
608 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | |
609 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | |
610 | np->rx.req_prod_pvt++; | |
611 | } | |
612 | ||
613 | static int xennet_get_extras(struct netfront_info *np, | |
614 | struct xen_netif_extra_info *extras, | |
615 | RING_IDX rp) | |
616 | ||
617 | { | |
618 | struct xen_netif_extra_info *extra; | |
619 | struct device *dev = &np->netdev->dev; | |
620 | RING_IDX cons = np->rx.rsp_cons; | |
621 | int err = 0; | |
622 | ||
623 | do { | |
624 | struct sk_buff *skb; | |
625 | grant_ref_t ref; | |
626 | ||
627 | if (unlikely(cons + 1 == rp)) { | |
628 | if (net_ratelimit()) | |
629 | dev_warn(dev, "Missing extra info\n"); | |
630 | err = -EBADR; | |
631 | break; | |
632 | } | |
633 | ||
634 | extra = (struct xen_netif_extra_info *) | |
635 | RING_GET_RESPONSE(&np->rx, ++cons); | |
636 | ||
637 | if (unlikely(!extra->type || | |
638 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
639 | if (net_ratelimit()) | |
640 | dev_warn(dev, "Invalid extra type: %d\n", | |
641 | extra->type); | |
642 | err = -EINVAL; | |
643 | } else { | |
644 | memcpy(&extras[extra->type - 1], extra, | |
645 | sizeof(*extra)); | |
646 | } | |
647 | ||
648 | skb = xennet_get_rx_skb(np, cons); | |
649 | ref = xennet_get_rx_ref(np, cons); | |
650 | xennet_move_rx_slot(np, skb, ref); | |
651 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | |
652 | ||
653 | np->rx.rsp_cons = cons; | |
654 | return err; | |
655 | } | |
656 | ||
657 | static int xennet_get_responses(struct netfront_info *np, | |
658 | struct netfront_rx_info *rinfo, RING_IDX rp, | |
659 | struct sk_buff_head *list) | |
660 | { | |
661 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
662 | struct xen_netif_extra_info *extras = rinfo->extras; | |
663 | struct device *dev = &np->netdev->dev; | |
664 | RING_IDX cons = np->rx.rsp_cons; | |
665 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | |
666 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | |
667 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | |
668 | int frags = 1; | |
669 | int err = 0; | |
670 | unsigned long ret; | |
671 | ||
672 | if (rx->flags & NETRXF_extra_info) { | |
673 | err = xennet_get_extras(np, extras, rp); | |
674 | cons = np->rx.rsp_cons; | |
675 | } | |
676 | ||
677 | for (;;) { | |
678 | if (unlikely(rx->status < 0 || | |
679 | rx->offset + rx->status > PAGE_SIZE)) { | |
680 | if (net_ratelimit()) | |
681 | dev_warn(dev, "rx->offset: %x, size: %u\n", | |
682 | rx->offset, rx->status); | |
683 | xennet_move_rx_slot(np, skb, ref); | |
684 | err = -EINVAL; | |
685 | goto next; | |
686 | } | |
687 | ||
688 | /* | |
689 | * This definitely indicates a bug, either in this driver or in | |
690 | * the backend driver. In future this should flag the bad | |
691 | * situation to the system controller to reboot the backed. | |
692 | */ | |
693 | if (ref == GRANT_INVALID_REF) { | |
694 | if (net_ratelimit()) | |
695 | dev_warn(dev, "Bad rx response id %d.\n", | |
696 | rx->id); | |
697 | err = -EINVAL; | |
698 | goto next; | |
699 | } | |
700 | ||
701 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
702 | BUG_ON(!ret); | |
703 | ||
704 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
705 | ||
706 | __skb_queue_tail(list, skb); | |
707 | ||
708 | next: | |
709 | if (!(rx->flags & NETRXF_more_data)) | |
710 | break; | |
711 | ||
712 | if (cons + frags == rp) { | |
713 | if (net_ratelimit()) | |
714 | dev_warn(dev, "Need more frags\n"); | |
715 | err = -ENOENT; | |
716 | break; | |
717 | } | |
718 | ||
719 | rx = RING_GET_RESPONSE(&np->rx, cons + frags); | |
720 | skb = xennet_get_rx_skb(np, cons + frags); | |
721 | ref = xennet_get_rx_ref(np, cons + frags); | |
722 | frags++; | |
723 | } | |
724 | ||
725 | if (unlikely(frags > max)) { | |
726 | if (net_ratelimit()) | |
727 | dev_warn(dev, "Too many frags\n"); | |
728 | err = -E2BIG; | |
729 | } | |
730 | ||
731 | if (unlikely(err)) | |
732 | np->rx.rsp_cons = cons + frags; | |
733 | ||
734 | return err; | |
735 | } | |
736 | ||
737 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
738 | struct xen_netif_extra_info *gso) | |
739 | { | |
740 | if (!gso->u.gso.size) { | |
741 | if (net_ratelimit()) | |
742 | printk(KERN_WARNING "GSO size must not be zero.\n"); | |
743 | return -EINVAL; | |
744 | } | |
745 | ||
746 | /* Currently only TCPv4 S.O. is supported. */ | |
747 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { | |
748 | if (net_ratelimit()) | |
749 | printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
753 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
754 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
755 | ||
756 | /* Header must be checked, and gso_segs computed. */ | |
757 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
758 | skb_shinfo(skb)->gso_segs = 0; | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
763 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | |
764 | struct sk_buff *skb, | |
765 | struct sk_buff_head *list) | |
766 | { | |
767 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
768 | int nr_frags = shinfo->nr_frags; | |
769 | RING_IDX cons = np->rx.rsp_cons; | |
770 | skb_frag_t *frag = shinfo->frags + nr_frags; | |
771 | struct sk_buff *nskb; | |
772 | ||
773 | while ((nskb = __skb_dequeue(list))) { | |
774 | struct xen_netif_rx_response *rx = | |
775 | RING_GET_RESPONSE(&np->rx, ++cons); | |
776 | ||
777 | frag->page = skb_shinfo(nskb)->frags[0].page; | |
778 | frag->page_offset = rx->offset; | |
779 | frag->size = rx->status; | |
780 | ||
781 | skb->data_len += rx->status; | |
782 | ||
783 | skb_shinfo(nskb)->nr_frags = 0; | |
784 | kfree_skb(nskb); | |
785 | ||
786 | frag++; | |
787 | nr_frags++; | |
788 | } | |
789 | ||
790 | shinfo->nr_frags = nr_frags; | |
791 | return cons; | |
792 | } | |
793 | ||
794 | static int skb_checksum_setup(struct sk_buff *skb) | |
795 | { | |
796 | struct iphdr *iph; | |
797 | unsigned char *th; | |
798 | int err = -EPROTO; | |
799 | ||
800 | if (skb->protocol != htons(ETH_P_IP)) | |
801 | goto out; | |
802 | ||
803 | iph = (void *)skb->data; | |
804 | th = skb->data + 4 * iph->ihl; | |
805 | if (th >= skb_tail_pointer(skb)) | |
806 | goto out; | |
807 | ||
808 | skb->csum_start = th - skb->head; | |
809 | switch (iph->protocol) { | |
810 | case IPPROTO_TCP: | |
811 | skb->csum_offset = offsetof(struct tcphdr, check); | |
812 | break; | |
813 | case IPPROTO_UDP: | |
814 | skb->csum_offset = offsetof(struct udphdr, check); | |
815 | break; | |
816 | default: | |
817 | if (net_ratelimit()) | |
818 | printk(KERN_ERR "Attempting to checksum a non-" | |
819 | "TCP/UDP packet, dropping a protocol" | |
820 | " %d packet", iph->protocol); | |
821 | goto out; | |
822 | } | |
823 | ||
824 | if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) | |
825 | goto out; | |
826 | ||
827 | err = 0; | |
828 | ||
829 | out: | |
830 | return err; | |
831 | } | |
832 | ||
833 | static int handle_incoming_queue(struct net_device *dev, | |
834 | struct sk_buff_head *rxq) | |
835 | { | |
836 | struct netfront_info *np = netdev_priv(dev); | |
837 | int packets_dropped = 0; | |
838 | struct sk_buff *skb; | |
839 | ||
840 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
841 | struct page *page = NETFRONT_SKB_CB(skb)->page; | |
842 | void *vaddr = page_address(page); | |
843 | unsigned offset = NETFRONT_SKB_CB(skb)->offset; | |
844 | ||
845 | memcpy(skb->data, vaddr + offset, | |
846 | skb_headlen(skb)); | |
847 | ||
848 | if (page != skb_shinfo(skb)->frags[0].page) | |
849 | __free_page(page); | |
850 | ||
851 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
852 | skb->protocol = eth_type_trans(skb, dev); | |
853 | ||
854 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
855 | if (skb_checksum_setup(skb)) { | |
856 | kfree_skb(skb); | |
857 | packets_dropped++; | |
858 | np->stats.rx_errors++; | |
859 | continue; | |
860 | } | |
861 | } | |
862 | ||
863 | np->stats.rx_packets++; | |
864 | np->stats.rx_bytes += skb->len; | |
865 | ||
866 | /* Pass it up. */ | |
867 | netif_receive_skb(skb); | |
868 | dev->last_rx = jiffies; | |
869 | } | |
870 | ||
871 | return packets_dropped; | |
872 | } | |
873 | ||
874 | static int xennet_poll(struct net_device *dev, int *pbudget) | |
875 | { | |
876 | struct netfront_info *np = netdev_priv(dev); | |
877 | struct sk_buff *skb; | |
878 | struct netfront_rx_info rinfo; | |
879 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
880 | struct xen_netif_extra_info *extras = rinfo.extras; | |
881 | RING_IDX i, rp; | |
882 | int work_done, budget, more_to_do = 1; | |
883 | struct sk_buff_head rxq; | |
884 | struct sk_buff_head errq; | |
885 | struct sk_buff_head tmpq; | |
886 | unsigned long flags; | |
887 | unsigned int len; | |
888 | int err; | |
889 | ||
890 | spin_lock(&np->rx_lock); | |
891 | ||
892 | if (unlikely(!netif_carrier_ok(dev))) { | |
893 | spin_unlock(&np->rx_lock); | |
894 | return 0; | |
895 | } | |
896 | ||
897 | skb_queue_head_init(&rxq); | |
898 | skb_queue_head_init(&errq); | |
899 | skb_queue_head_init(&tmpq); | |
900 | ||
901 | budget = *pbudget; | |
902 | if (budget > dev->quota) | |
903 | budget = dev->quota; | |
904 | rp = np->rx.sring->rsp_prod; | |
905 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | |
906 | ||
907 | i = np->rx.rsp_cons; | |
908 | work_done = 0; | |
909 | while ((i != rp) && (work_done < budget)) { | |
910 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | |
911 | memset(extras, 0, sizeof(rinfo.extras)); | |
912 | ||
913 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | |
914 | ||
915 | if (unlikely(err)) { | |
916 | err: | |
917 | while ((skb = __skb_dequeue(&tmpq))) | |
918 | __skb_queue_tail(&errq, skb); | |
919 | np->stats.rx_errors++; | |
920 | i = np->rx.rsp_cons; | |
921 | continue; | |
922 | } | |
923 | ||
924 | skb = __skb_dequeue(&tmpq); | |
925 | ||
926 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
927 | struct xen_netif_extra_info *gso; | |
928 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
929 | ||
930 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
931 | __skb_queue_head(&tmpq, skb); | |
932 | np->rx.rsp_cons += skb_queue_len(&tmpq); | |
933 | goto err; | |
934 | } | |
935 | } | |
936 | ||
937 | NETFRONT_SKB_CB(skb)->page = skb_shinfo(skb)->frags[0].page; | |
938 | NETFRONT_SKB_CB(skb)->offset = rx->offset; | |
939 | ||
940 | len = rx->status; | |
941 | if (len > RX_COPY_THRESHOLD) | |
942 | len = RX_COPY_THRESHOLD; | |
943 | skb_put(skb, len); | |
944 | ||
945 | if (rx->status > len) { | |
946 | skb_shinfo(skb)->frags[0].page_offset = | |
947 | rx->offset + len; | |
948 | skb_shinfo(skb)->frags[0].size = rx->status - len; | |
949 | skb->data_len = rx->status - len; | |
950 | } else { | |
951 | skb_shinfo(skb)->frags[0].page = NULL; | |
952 | skb_shinfo(skb)->nr_frags = 0; | |
953 | } | |
954 | ||
955 | i = xennet_fill_frags(np, skb, &tmpq); | |
956 | ||
957 | /* | |
958 | * Truesize approximates the size of true data plus | |
959 | * any supervisor overheads. Adding hypervisor | |
960 | * overheads has been shown to significantly reduce | |
961 | * achievable bandwidth with the default receive | |
962 | * buffer size. It is therefore not wise to account | |
963 | * for it here. | |
964 | * | |
965 | * After alloc_skb(RX_COPY_THRESHOLD), truesize is set | |
966 | * to RX_COPY_THRESHOLD + the supervisor | |
967 | * overheads. Here, we add the size of the data pulled | |
968 | * in xennet_fill_frags(). | |
969 | * | |
970 | * We also adjust for any unused space in the main | |
971 | * data area by subtracting (RX_COPY_THRESHOLD - | |
972 | * len). This is especially important with drivers | |
973 | * which split incoming packets into header and data, | |
974 | * using only 66 bytes of the main data area (see the | |
975 | * e1000 driver for example.) On such systems, | |
976 | * without this last adjustement, our achievable | |
977 | * receive throughout using the standard receive | |
978 | * buffer size was cut by 25%(!!!). | |
979 | */ | |
980 | skb->truesize += skb->data_len - (RX_COPY_THRESHOLD - len); | |
981 | skb->len += skb->data_len; | |
982 | ||
983 | if (rx->flags & NETRXF_csum_blank) | |
984 | skb->ip_summed = CHECKSUM_PARTIAL; | |
985 | else if (rx->flags & NETRXF_data_validated) | |
986 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
987 | ||
988 | __skb_queue_tail(&rxq, skb); | |
989 | ||
990 | np->rx.rsp_cons = ++i; | |
991 | work_done++; | |
992 | } | |
993 | ||
994 | while ((skb = __skb_dequeue(&errq))) | |
995 | kfree_skb(skb); | |
996 | ||
997 | work_done -= handle_incoming_queue(dev, &rxq); | |
998 | ||
999 | /* If we get a callback with very few responses, reduce fill target. */ | |
1000 | /* NB. Note exponential increase, linear decrease. */ | |
1001 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > | |
1002 | ((3*np->rx_target) / 4)) && | |
1003 | (--np->rx_target < np->rx_min_target)) | |
1004 | np->rx_target = np->rx_min_target; | |
1005 | ||
1006 | xennet_alloc_rx_buffers(dev); | |
1007 | ||
1008 | *pbudget -= work_done; | |
1009 | dev->quota -= work_done; | |
1010 | ||
1011 | if (work_done < budget) { | |
1012 | local_irq_save(flags); | |
1013 | ||
1014 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | |
1015 | if (!more_to_do) | |
1016 | __netif_rx_complete(dev); | |
1017 | ||
1018 | local_irq_restore(flags); | |
1019 | } | |
1020 | ||
1021 | spin_unlock(&np->rx_lock); | |
1022 | ||
1023 | return more_to_do; | |
1024 | } | |
1025 | ||
1026 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
1027 | { | |
1028 | int max = xennet_can_sg(dev) ? 65535 - ETH_HLEN : ETH_DATA_LEN; | |
1029 | ||
1030 | if (mtu > max) | |
1031 | return -EINVAL; | |
1032 | dev->mtu = mtu; | |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | static void xennet_release_tx_bufs(struct netfront_info *np) | |
1037 | { | |
1038 | struct sk_buff *skb; | |
1039 | int i; | |
1040 | ||
1041 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1042 | /* Skip over entries which are actually freelist references */ | |
1043 | if ((unsigned long)np->tx_skbs[i].skb < PAGE_OFFSET) | |
1044 | continue; | |
1045 | ||
1046 | skb = np->tx_skbs[i].skb; | |
1047 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], | |
1048 | GNTMAP_readonly); | |
1049 | gnttab_release_grant_reference(&np->gref_tx_head, | |
1050 | np->grant_tx_ref[i]); | |
1051 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1052 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | |
1053 | dev_kfree_skb_irq(skb); | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | static void xennet_release_rx_bufs(struct netfront_info *np) | |
1058 | { | |
1059 | struct mmu_update *mmu = np->rx_mmu; | |
1060 | struct multicall_entry *mcl = np->rx_mcl; | |
1061 | struct sk_buff_head free_list; | |
1062 | struct sk_buff *skb; | |
1063 | unsigned long mfn; | |
1064 | int xfer = 0, noxfer = 0, unused = 0; | |
1065 | int id, ref; | |
1066 | ||
1067 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", | |
1068 | __func__); | |
1069 | return; | |
1070 | ||
1071 | skb_queue_head_init(&free_list); | |
1072 | ||
1073 | spin_lock_bh(&np->rx_lock); | |
1074 | ||
1075 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
1076 | ref = np->grant_rx_ref[id]; | |
1077 | if (ref == GRANT_INVALID_REF) { | |
1078 | unused++; | |
1079 | continue; | |
1080 | } | |
1081 | ||
1082 | skb = np->rx_skbs[id]; | |
1083 | mfn = gnttab_end_foreign_transfer_ref(ref); | |
1084 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
1085 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | |
1086 | ||
1087 | if (0 == mfn) { | |
1088 | skb_shinfo(skb)->nr_frags = 0; | |
1089 | dev_kfree_skb(skb); | |
1090 | noxfer++; | |
1091 | continue; | |
1092 | } | |
1093 | ||
1094 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1095 | /* Remap the page. */ | |
1096 | struct page *page = skb_shinfo(skb)->frags[0].page; | |
1097 | unsigned long pfn = page_to_pfn(page); | |
1098 | void *vaddr = page_address(page); | |
1099 | ||
1100 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, | |
1101 | mfn_pte(mfn, PAGE_KERNEL), | |
1102 | 0); | |
1103 | mcl++; | |
1104 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) | |
1105 | | MMU_MACHPHYS_UPDATE; | |
1106 | mmu->val = pfn; | |
1107 | mmu++; | |
1108 | ||
1109 | set_phys_to_machine(pfn, mfn); | |
1110 | } | |
1111 | __skb_queue_tail(&free_list, skb); | |
1112 | xfer++; | |
1113 | } | |
1114 | ||
1115 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", | |
1116 | __func__, xfer, noxfer, unused); | |
1117 | ||
1118 | if (xfer) { | |
1119 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1120 | /* Do all the remapping work and M2P updates. */ | |
1121 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, | |
1122 | 0, DOMID_SELF); | |
1123 | mcl++; | |
1124 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | while ((skb = __skb_dequeue(&free_list)) != NULL) | |
1129 | dev_kfree_skb(skb); | |
1130 | ||
1131 | spin_unlock_bh(&np->rx_lock); | |
1132 | } | |
1133 | ||
1134 | static void xennet_uninit(struct net_device *dev) | |
1135 | { | |
1136 | struct netfront_info *np = netdev_priv(dev); | |
1137 | xennet_release_tx_bufs(np); | |
1138 | xennet_release_rx_bufs(np); | |
1139 | gnttab_free_grant_references(np->gref_tx_head); | |
1140 | gnttab_free_grant_references(np->gref_rx_head); | |
1141 | } | |
1142 | ||
1143 | static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev) | |
1144 | { | |
1145 | int i, err; | |
1146 | struct net_device *netdev; | |
1147 | struct netfront_info *np; | |
1148 | ||
1149 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | |
1150 | if (!netdev) { | |
1151 | printk(KERN_WARNING "%s> alloc_etherdev failed.\n", | |
1152 | __func__); | |
1153 | return ERR_PTR(-ENOMEM); | |
1154 | } | |
1155 | ||
1156 | np = netdev_priv(netdev); | |
1157 | np->xbdev = dev; | |
1158 | ||
1159 | spin_lock_init(&np->tx_lock); | |
1160 | spin_lock_init(&np->rx_lock); | |
1161 | ||
1162 | skb_queue_head_init(&np->rx_batch); | |
1163 | np->rx_target = RX_DFL_MIN_TARGET; | |
1164 | np->rx_min_target = RX_DFL_MIN_TARGET; | |
1165 | np->rx_max_target = RX_MAX_TARGET; | |
1166 | ||
1167 | init_timer(&np->rx_refill_timer); | |
1168 | np->rx_refill_timer.data = (unsigned long)netdev; | |
1169 | np->rx_refill_timer.function = rx_refill_timeout; | |
1170 | ||
1171 | /* Initialise tx_skbs as a free chain containing every entry. */ | |
1172 | np->tx_skb_freelist = 0; | |
1173 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1174 | np->tx_skbs[i].link = i+1; | |
1175 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1176 | } | |
1177 | ||
1178 | /* Clear out rx_skbs */ | |
1179 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1180 | np->rx_skbs[i] = NULL; | |
1181 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1182 | } | |
1183 | ||
1184 | /* A grant for every tx ring slot */ | |
1185 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | |
1186 | &np->gref_tx_head) < 0) { | |
1187 | printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); | |
1188 | err = -ENOMEM; | |
1189 | goto exit; | |
1190 | } | |
1191 | /* A grant for every rx ring slot */ | |
1192 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | |
1193 | &np->gref_rx_head) < 0) { | |
1194 | printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); | |
1195 | err = -ENOMEM; | |
1196 | goto exit_free_tx; | |
1197 | } | |
1198 | ||
1199 | netdev->open = xennet_open; | |
1200 | netdev->hard_start_xmit = xennet_start_xmit; | |
1201 | netdev->stop = xennet_close; | |
1202 | netdev->get_stats = xennet_get_stats; | |
1203 | netdev->poll = xennet_poll; | |
1204 | netdev->uninit = xennet_uninit; | |
1205 | netdev->change_mtu = xennet_change_mtu; | |
1206 | netdev->weight = 64; | |
1207 | netdev->features = NETIF_F_IP_CSUM; | |
1208 | ||
1209 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); | |
1210 | SET_MODULE_OWNER(netdev); | |
1211 | SET_NETDEV_DEV(netdev, &dev->dev); | |
1212 | ||
1213 | np->netdev = netdev; | |
1214 | ||
1215 | netif_carrier_off(netdev); | |
1216 | ||
1217 | return netdev; | |
1218 | ||
1219 | exit_free_tx: | |
1220 | gnttab_free_grant_references(np->gref_tx_head); | |
1221 | exit: | |
1222 | free_netdev(netdev); | |
1223 | return ERR_PTR(err); | |
1224 | } | |
1225 | ||
1226 | /** | |
1227 | * Entry point to this code when a new device is created. Allocate the basic | |
1228 | * structures and the ring buffers for communication with the backend, and | |
1229 | * inform the backend of the appropriate details for those. | |
1230 | */ | |
1231 | static int __devinit netfront_probe(struct xenbus_device *dev, | |
1232 | const struct xenbus_device_id *id) | |
1233 | { | |
1234 | int err; | |
1235 | struct net_device *netdev; | |
1236 | struct netfront_info *info; | |
1237 | ||
1238 | netdev = xennet_create_dev(dev); | |
1239 | if (IS_ERR(netdev)) { | |
1240 | err = PTR_ERR(netdev); | |
1241 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1242 | return err; | |
1243 | } | |
1244 | ||
1245 | info = netdev_priv(netdev); | |
1246 | dev->dev.driver_data = info; | |
1247 | ||
1248 | err = register_netdev(info->netdev); | |
1249 | if (err) { | |
1250 | printk(KERN_WARNING "%s: register_netdev err=%d\n", | |
1251 | __func__, err); | |
1252 | goto fail; | |
1253 | } | |
1254 | ||
1255 | err = xennet_sysfs_addif(info->netdev); | |
1256 | if (err) { | |
1257 | unregister_netdev(info->netdev); | |
1258 | printk(KERN_WARNING "%s: add sysfs failed err=%d\n", | |
1259 | __func__, err); | |
1260 | goto fail; | |
1261 | } | |
1262 | ||
1263 | return 0; | |
1264 | ||
1265 | fail: | |
1266 | free_netdev(netdev); | |
1267 | dev->dev.driver_data = NULL; | |
1268 | return err; | |
1269 | } | |
1270 | ||
1271 | static void xennet_end_access(int ref, void *page) | |
1272 | { | |
1273 | /* This frees the page as a side-effect */ | |
1274 | if (ref != GRANT_INVALID_REF) | |
1275 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1276 | } | |
1277 | ||
1278 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1279 | { | |
1280 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | |
1281 | spin_lock_bh(&info->rx_lock); | |
1282 | spin_lock_irq(&info->tx_lock); | |
1283 | netif_carrier_off(info->netdev); | |
1284 | spin_unlock_irq(&info->tx_lock); | |
1285 | spin_unlock_bh(&info->rx_lock); | |
1286 | ||
1287 | if (info->netdev->irq) | |
1288 | unbind_from_irqhandler(info->netdev->irq, info->netdev); | |
1289 | info->evtchn = info->netdev->irq = 0; | |
1290 | ||
1291 | /* End access and free the pages */ | |
1292 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | |
1293 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | |
1294 | ||
1295 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1296 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1297 | info->tx.sring = NULL; | |
1298 | info->rx.sring = NULL; | |
1299 | } | |
1300 | ||
1301 | /** | |
1302 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1303 | * driver restart. We tear down our netif structure and recreate it, but | |
1304 | * leave the device-layer structures intact so that this is transparent to the | |
1305 | * rest of the kernel. | |
1306 | */ | |
1307 | static int netfront_resume(struct xenbus_device *dev) | |
1308 | { | |
1309 | struct netfront_info *info = dev->dev.driver_data; | |
1310 | ||
1311 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1312 | ||
1313 | xennet_disconnect_backend(info); | |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1318 | { | |
1319 | char *s, *e, *macstr; | |
1320 | int i; | |
1321 | ||
1322 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1323 | if (IS_ERR(macstr)) | |
1324 | return PTR_ERR(macstr); | |
1325 | ||
1326 | for (i = 0; i < ETH_ALEN; i++) { | |
1327 | mac[i] = simple_strtoul(s, &e, 16); | |
1328 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1329 | kfree(macstr); | |
1330 | return -ENOENT; | |
1331 | } | |
1332 | s = e+1; | |
1333 | } | |
1334 | ||
1335 | kfree(macstr); | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) | |
1340 | { | |
1341 | struct net_device *dev = dev_id; | |
1342 | struct netfront_info *np = netdev_priv(dev); | |
1343 | unsigned long flags; | |
1344 | ||
1345 | spin_lock_irqsave(&np->tx_lock, flags); | |
1346 | ||
1347 | if (likely(netif_carrier_ok(dev))) { | |
1348 | xennet_tx_buf_gc(dev); | |
1349 | /* Under tx_lock: protects access to rx shared-ring indexes. */ | |
1350 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
1351 | netif_rx_schedule(dev); | |
1352 | } | |
1353 | ||
1354 | spin_unlock_irqrestore(&np->tx_lock, flags); | |
1355 | ||
1356 | return IRQ_HANDLED; | |
1357 | } | |
1358 | ||
1359 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) | |
1360 | { | |
1361 | struct xen_netif_tx_sring *txs; | |
1362 | struct xen_netif_rx_sring *rxs; | |
1363 | int err; | |
1364 | struct net_device *netdev = info->netdev; | |
1365 | ||
1366 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1367 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1368 | info->rx.sring = NULL; | |
1369 | info->tx.sring = NULL; | |
1370 | netdev->irq = 0; | |
1371 | ||
1372 | err = xen_net_read_mac(dev, netdev->dev_addr); | |
1373 | if (err) { | |
1374 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1375 | goto fail; | |
1376 | } | |
1377 | ||
1378 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_KERNEL); | |
1379 | if (!txs) { | |
1380 | err = -ENOMEM; | |
1381 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1382 | goto fail; | |
1383 | } | |
1384 | SHARED_RING_INIT(txs); | |
1385 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | |
1386 | ||
1387 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | |
1388 | if (err < 0) { | |
1389 | free_page((unsigned long)txs); | |
1390 | goto fail; | |
1391 | } | |
1392 | ||
1393 | info->tx_ring_ref = err; | |
1394 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_KERNEL); | |
1395 | if (!rxs) { | |
1396 | err = -ENOMEM; | |
1397 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1398 | goto fail; | |
1399 | } | |
1400 | SHARED_RING_INIT(rxs); | |
1401 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | |
1402 | ||
1403 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | |
1404 | if (err < 0) { | |
1405 | free_page((unsigned long)rxs); | |
1406 | goto fail; | |
1407 | } | |
1408 | info->rx_ring_ref = err; | |
1409 | ||
1410 | err = xenbus_alloc_evtchn(dev, &info->evtchn); | |
1411 | if (err) | |
1412 | goto fail; | |
1413 | ||
1414 | err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, | |
1415 | IRQF_SAMPLE_RANDOM, netdev->name, | |
1416 | netdev); | |
1417 | if (err < 0) | |
1418 | goto fail; | |
1419 | netdev->irq = err; | |
1420 | return 0; | |
1421 | ||
1422 | fail: | |
1423 | return err; | |
1424 | } | |
1425 | ||
1426 | /* Common code used when first setting up, and when resuming. */ | |
1427 | static int talk_to_backend(struct xenbus_device *dev, | |
1428 | struct netfront_info *info) | |
1429 | { | |
1430 | const char *message; | |
1431 | struct xenbus_transaction xbt; | |
1432 | int err; | |
1433 | ||
1434 | /* Create shared ring, alloc event channel. */ | |
1435 | err = setup_netfront(dev, info); | |
1436 | if (err) | |
1437 | goto out; | |
1438 | ||
1439 | again: | |
1440 | err = xenbus_transaction_start(&xbt); | |
1441 | if (err) { | |
1442 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1443 | goto destroy_ring; | |
1444 | } | |
1445 | ||
1446 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | |
1447 | info->tx_ring_ref); | |
1448 | if (err) { | |
1449 | message = "writing tx ring-ref"; | |
1450 | goto abort_transaction; | |
1451 | } | |
1452 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | |
1453 | info->rx_ring_ref); | |
1454 | if (err) { | |
1455 | message = "writing rx ring-ref"; | |
1456 | goto abort_transaction; | |
1457 | } | |
1458 | err = xenbus_printf(xbt, dev->nodename, | |
1459 | "event-channel", "%u", info->evtchn); | |
1460 | if (err) { | |
1461 | message = "writing event-channel"; | |
1462 | goto abort_transaction; | |
1463 | } | |
1464 | ||
1465 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | |
1466 | 1); | |
1467 | if (err) { | |
1468 | message = "writing request-rx-copy"; | |
1469 | goto abort_transaction; | |
1470 | } | |
1471 | ||
1472 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1473 | if (err) { | |
1474 | message = "writing feature-rx-notify"; | |
1475 | goto abort_transaction; | |
1476 | } | |
1477 | ||
1478 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1479 | if (err) { | |
1480 | message = "writing feature-sg"; | |
1481 | goto abort_transaction; | |
1482 | } | |
1483 | ||
1484 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1485 | if (err) { | |
1486 | message = "writing feature-gso-tcpv4"; | |
1487 | goto abort_transaction; | |
1488 | } | |
1489 | ||
1490 | err = xenbus_transaction_end(xbt, 0); | |
1491 | if (err) { | |
1492 | if (err == -EAGAIN) | |
1493 | goto again; | |
1494 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1495 | goto destroy_ring; | |
1496 | } | |
1497 | ||
1498 | return 0; | |
1499 | ||
1500 | abort_transaction: | |
1501 | xenbus_transaction_end(xbt, 1); | |
1502 | xenbus_dev_fatal(dev, err, "%s", message); | |
1503 | destroy_ring: | |
1504 | xennet_disconnect_backend(info); | |
1505 | out: | |
1506 | return err; | |
1507 | } | |
1508 | ||
1509 | static int xennet_set_sg(struct net_device *dev, u32 data) | |
1510 | { | |
1511 | if (data) { | |
1512 | struct netfront_info *np = netdev_priv(dev); | |
1513 | int val; | |
1514 | ||
1515 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | |
1516 | "%d", &val) < 0) | |
1517 | val = 0; | |
1518 | if (!val) | |
1519 | return -ENOSYS; | |
1520 | } else if (dev->mtu > ETH_DATA_LEN) | |
1521 | dev->mtu = ETH_DATA_LEN; | |
1522 | ||
1523 | return ethtool_op_set_sg(dev, data); | |
1524 | } | |
1525 | ||
1526 | static int xennet_set_tso(struct net_device *dev, u32 data) | |
1527 | { | |
1528 | if (data) { | |
1529 | struct netfront_info *np = netdev_priv(dev); | |
1530 | int val; | |
1531 | ||
1532 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1533 | "feature-gso-tcpv4", "%d", &val) < 0) | |
1534 | val = 0; | |
1535 | if (!val) | |
1536 | return -ENOSYS; | |
1537 | } | |
1538 | ||
1539 | return ethtool_op_set_tso(dev, data); | |
1540 | } | |
1541 | ||
1542 | static void xennet_set_features(struct net_device *dev) | |
1543 | { | |
1544 | /* Turn off all GSO bits except ROBUST. */ | |
1545 | dev->features &= (1 << NETIF_F_GSO_SHIFT) - 1; | |
1546 | dev->features |= NETIF_F_GSO_ROBUST; | |
1547 | xennet_set_sg(dev, 0); | |
1548 | ||
1549 | /* We need checksum offload to enable scatter/gather and TSO. */ | |
1550 | if (!(dev->features & NETIF_F_IP_CSUM)) | |
1551 | return; | |
1552 | ||
1553 | if (!xennet_set_sg(dev, 1)) | |
1554 | xennet_set_tso(dev, 1); | |
1555 | } | |
1556 | ||
1557 | static int xennet_connect(struct net_device *dev) | |
1558 | { | |
1559 | struct netfront_info *np = netdev_priv(dev); | |
1560 | int i, requeue_idx, err; | |
1561 | struct sk_buff *skb; | |
1562 | grant_ref_t ref; | |
1563 | struct xen_netif_rx_request *req; | |
1564 | unsigned int feature_rx_copy; | |
1565 | ||
1566 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1567 | "feature-rx-copy", "%u", &feature_rx_copy); | |
1568 | if (err != 1) | |
1569 | feature_rx_copy = 0; | |
1570 | ||
1571 | if (!feature_rx_copy) { | |
1572 | dev_info(&dev->dev, | |
1573 | "backend does not support copying recieve path"); | |
1574 | return -ENODEV; | |
1575 | } | |
1576 | ||
1577 | err = talk_to_backend(np->xbdev, np); | |
1578 | if (err) | |
1579 | return err; | |
1580 | ||
1581 | xennet_set_features(dev); | |
1582 | ||
1583 | spin_lock_bh(&np->rx_lock); | |
1584 | spin_lock_irq(&np->tx_lock); | |
1585 | ||
1586 | /* Step 1: Discard all pending TX packet fragments. */ | |
1587 | xennet_release_tx_bufs(np); | |
1588 | ||
1589 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | |
1590 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | |
1591 | if (!np->rx_skbs[i]) | |
1592 | continue; | |
1593 | ||
1594 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | |
1595 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | |
1596 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | |
1597 | ||
1598 | gnttab_grant_foreign_access_ref( | |
1599 | ref, np->xbdev->otherend_id, | |
1600 | pfn_to_mfn(page_to_pfn(skb_shinfo(skb)-> | |
1601 | frags->page)), | |
1602 | 0); | |
1603 | req->gref = ref; | |
1604 | req->id = requeue_idx; | |
1605 | ||
1606 | requeue_idx++; | |
1607 | } | |
1608 | ||
1609 | np->rx.req_prod_pvt = requeue_idx; | |
1610 | ||
1611 | /* | |
1612 | * Step 3: All public and private state should now be sane. Get | |
1613 | * ready to start sending and receiving packets and give the driver | |
1614 | * domain a kick because we've probably just requeued some | |
1615 | * packets. | |
1616 | */ | |
1617 | netif_carrier_on(np->netdev); | |
1618 | notify_remote_via_irq(np->netdev->irq); | |
1619 | xennet_tx_buf_gc(dev); | |
1620 | xennet_alloc_rx_buffers(dev); | |
1621 | ||
1622 | spin_unlock_irq(&np->tx_lock); | |
1623 | spin_unlock_bh(&np->rx_lock); | |
1624 | ||
1625 | return 0; | |
1626 | } | |
1627 | ||
1628 | /** | |
1629 | * Callback received when the backend's state changes. | |
1630 | */ | |
1631 | static void backend_changed(struct xenbus_device *dev, | |
1632 | enum xenbus_state backend_state) | |
1633 | { | |
1634 | struct netfront_info *np = dev->dev.driver_data; | |
1635 | struct net_device *netdev = np->netdev; | |
1636 | ||
1637 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
1638 | ||
1639 | switch (backend_state) { | |
1640 | case XenbusStateInitialising: | |
1641 | case XenbusStateInitialised: | |
1642 | case XenbusStateConnected: | |
1643 | case XenbusStateUnknown: | |
1644 | case XenbusStateClosed: | |
1645 | break; | |
1646 | ||
1647 | case XenbusStateInitWait: | |
1648 | if (dev->state != XenbusStateInitialising) | |
1649 | break; | |
1650 | if (xennet_connect(netdev) != 0) | |
1651 | break; | |
1652 | xenbus_switch_state(dev, XenbusStateConnected); | |
1653 | break; | |
1654 | ||
1655 | case XenbusStateClosing: | |
1656 | xenbus_frontend_closed(dev); | |
1657 | break; | |
1658 | } | |
1659 | } | |
1660 | ||
1661 | static struct ethtool_ops xennet_ethtool_ops = | |
1662 | { | |
1663 | .get_tx_csum = ethtool_op_get_tx_csum, | |
1664 | .set_tx_csum = ethtool_op_set_tx_csum, | |
1665 | .get_sg = ethtool_op_get_sg, | |
1666 | .set_sg = xennet_set_sg, | |
1667 | .get_tso = ethtool_op_get_tso, | |
1668 | .set_tso = xennet_set_tso, | |
1669 | .get_link = ethtool_op_get_link, | |
1670 | }; | |
1671 | ||
1672 | #ifdef CONFIG_SYSFS | |
1673 | static ssize_t show_rxbuf_min(struct device *dev, | |
1674 | struct device_attribute *attr, char *buf) | |
1675 | { | |
1676 | struct net_device *netdev = to_net_dev(dev); | |
1677 | struct netfront_info *info = netdev_priv(netdev); | |
1678 | ||
1679 | return sprintf(buf, "%u\n", info->rx_min_target); | |
1680 | } | |
1681 | ||
1682 | static ssize_t store_rxbuf_min(struct device *dev, | |
1683 | struct device_attribute *attr, | |
1684 | const char *buf, size_t len) | |
1685 | { | |
1686 | struct net_device *netdev = to_net_dev(dev); | |
1687 | struct netfront_info *np = netdev_priv(netdev); | |
1688 | char *endp; | |
1689 | unsigned long target; | |
1690 | ||
1691 | if (!capable(CAP_NET_ADMIN)) | |
1692 | return -EPERM; | |
1693 | ||
1694 | target = simple_strtoul(buf, &endp, 0); | |
1695 | if (endp == buf) | |
1696 | return -EBADMSG; | |
1697 | ||
1698 | if (target < RX_MIN_TARGET) | |
1699 | target = RX_MIN_TARGET; | |
1700 | if (target > RX_MAX_TARGET) | |
1701 | target = RX_MAX_TARGET; | |
1702 | ||
1703 | spin_lock_bh(&np->rx_lock); | |
1704 | if (target > np->rx_max_target) | |
1705 | np->rx_max_target = target; | |
1706 | np->rx_min_target = target; | |
1707 | if (target > np->rx_target) | |
1708 | np->rx_target = target; | |
1709 | ||
1710 | xennet_alloc_rx_buffers(netdev); | |
1711 | ||
1712 | spin_unlock_bh(&np->rx_lock); | |
1713 | return len; | |
1714 | } | |
1715 | ||
1716 | static ssize_t show_rxbuf_max(struct device *dev, | |
1717 | struct device_attribute *attr, char *buf) | |
1718 | { | |
1719 | struct net_device *netdev = to_net_dev(dev); | |
1720 | struct netfront_info *info = netdev_priv(netdev); | |
1721 | ||
1722 | return sprintf(buf, "%u\n", info->rx_max_target); | |
1723 | } | |
1724 | ||
1725 | static ssize_t store_rxbuf_max(struct device *dev, | |
1726 | struct device_attribute *attr, | |
1727 | const char *buf, size_t len) | |
1728 | { | |
1729 | struct net_device *netdev = to_net_dev(dev); | |
1730 | struct netfront_info *np = netdev_priv(netdev); | |
1731 | char *endp; | |
1732 | unsigned long target; | |
1733 | ||
1734 | if (!capable(CAP_NET_ADMIN)) | |
1735 | return -EPERM; | |
1736 | ||
1737 | target = simple_strtoul(buf, &endp, 0); | |
1738 | if (endp == buf) | |
1739 | return -EBADMSG; | |
1740 | ||
1741 | if (target < RX_MIN_TARGET) | |
1742 | target = RX_MIN_TARGET; | |
1743 | if (target > RX_MAX_TARGET) | |
1744 | target = RX_MAX_TARGET; | |
1745 | ||
1746 | spin_lock_bh(&np->rx_lock); | |
1747 | if (target < np->rx_min_target) | |
1748 | np->rx_min_target = target; | |
1749 | np->rx_max_target = target; | |
1750 | if (target < np->rx_target) | |
1751 | np->rx_target = target; | |
1752 | ||
1753 | xennet_alloc_rx_buffers(netdev); | |
1754 | ||
1755 | spin_unlock_bh(&np->rx_lock); | |
1756 | return len; | |
1757 | } | |
1758 | ||
1759 | static ssize_t show_rxbuf_cur(struct device *dev, | |
1760 | struct device_attribute *attr, char *buf) | |
1761 | { | |
1762 | struct net_device *netdev = to_net_dev(dev); | |
1763 | struct netfront_info *info = netdev_priv(netdev); | |
1764 | ||
1765 | return sprintf(buf, "%u\n", info->rx_target); | |
1766 | } | |
1767 | ||
1768 | static struct device_attribute xennet_attrs[] = { | |
1769 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | |
1770 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | |
1771 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | |
1772 | }; | |
1773 | ||
1774 | static int xennet_sysfs_addif(struct net_device *netdev) | |
1775 | { | |
1776 | int i; | |
1777 | int err; | |
1778 | ||
1779 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | |
1780 | err = device_create_file(&netdev->dev, | |
1781 | &xennet_attrs[i]); | |
1782 | if (err) | |
1783 | goto fail; | |
1784 | } | |
1785 | return 0; | |
1786 | ||
1787 | fail: | |
1788 | while (--i >= 0) | |
1789 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1790 | return err; | |
1791 | } | |
1792 | ||
1793 | static void xennet_sysfs_delif(struct net_device *netdev) | |
1794 | { | |
1795 | int i; | |
1796 | ||
1797 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | |
1798 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1799 | } | |
1800 | ||
1801 | #endif /* CONFIG_SYSFS */ | |
1802 | ||
1803 | static struct xenbus_device_id netfront_ids[] = { | |
1804 | { "vif" }, | |
1805 | { "" } | |
1806 | }; | |
1807 | ||
1808 | ||
1809 | static int __devexit xennet_remove(struct xenbus_device *dev) | |
1810 | { | |
1811 | struct netfront_info *info = dev->dev.driver_data; | |
1812 | ||
1813 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1814 | ||
1815 | unregister_netdev(info->netdev); | |
1816 | ||
1817 | xennet_disconnect_backend(info); | |
1818 | ||
1819 | del_timer_sync(&info->rx_refill_timer); | |
1820 | ||
1821 | xennet_sysfs_delif(info->netdev); | |
1822 | ||
1823 | free_netdev(info->netdev); | |
1824 | ||
1825 | return 0; | |
1826 | } | |
1827 | ||
1828 | static struct xenbus_driver netfront = { | |
1829 | .name = "vif", | |
1830 | .owner = THIS_MODULE, | |
1831 | .ids = netfront_ids, | |
1832 | .probe = netfront_probe, | |
1833 | .remove = __devexit_p(xennet_remove), | |
1834 | .resume = netfront_resume, | |
1835 | .otherend_changed = backend_changed, | |
1836 | }; | |
1837 | ||
1838 | static int __init netif_init(void) | |
1839 | { | |
1840 | if (!is_running_on_xen()) | |
1841 | return -ENODEV; | |
1842 | ||
1843 | if (is_initial_xendomain()) | |
1844 | return 0; | |
1845 | ||
1846 | printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); | |
1847 | ||
1848 | return xenbus_register_frontend(&netfront); | |
1849 | } | |
1850 | module_init(netif_init); | |
1851 | ||
1852 | ||
1853 | static void __exit netif_exit(void) | |
1854 | { | |
1855 | if (is_initial_xendomain()) | |
1856 | return; | |
1857 | ||
1858 | return xenbus_unregister_driver(&netfront); | |
1859 | } | |
1860 | module_exit(netif_exit); | |
1861 | ||
1862 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
1863 | MODULE_LICENSE("GPL"); |