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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 <linux/slab.h> |
44 | #include <net/ip.h> |
45 | |
46 | #include <xen/xen.h> |
47 | #include <xen/xenbus.h> |
48 | #include <xen/events.h> |
49 | #include <xen/page.h> |
50 | #include <xen/platform_pci.h> |
51 | #include <xen/grant_table.h> |
52 | |
53 | #include <xen/interface/io/netif.h> |
54 | #include <xen/interface/memory.h> |
55 | #include <xen/interface/grant_table.h> |
56 | |
57 | static const struct ethtool_ops xennet_ethtool_ops; |
58 | |
59 | struct netfront_cb { |
60 | int pull_to; |
61 | }; |
62 | |
63 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) |
64 | |
65 | #define RX_COPY_THRESHOLD 256 |
66 | |
67 | #define GRANT_INVALID_REF 0 |
68 | |
69 | #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) |
70 | #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) |
71 | #define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256) |
72 | |
73 | struct netfront_stats { |
74 | u64 rx_packets; |
75 | u64 tx_packets; |
76 | u64 rx_bytes; |
77 | u64 tx_bytes; |
78 | struct u64_stats_sync syncp; |
79 | }; |
80 | |
81 | struct netfront_info { |
82 | struct list_head list; |
83 | struct net_device *netdev; |
84 | |
85 | struct napi_struct napi; |
86 | |
87 | unsigned int evtchn; |
88 | struct xenbus_device *xbdev; |
89 | |
90 | spinlock_t tx_lock; |
91 | struct xen_netif_tx_front_ring tx; |
92 | int tx_ring_ref; |
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 long 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 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
112 | struct xen_netif_rx_front_ring rx; |
113 | int rx_ring_ref; |
114 | |
115 | /* Receive-ring batched refills. */ |
116 | #define RX_MIN_TARGET 8 |
117 | #define RX_DFL_MIN_TARGET 64 |
118 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) |
119 | unsigned rx_min_target, rx_max_target, rx_target; |
120 | struct sk_buff_head rx_batch; |
121 | |
122 | struct timer_list rx_refill_timer; |
123 | |
124 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
125 | grant_ref_t gref_rx_head; |
126 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; |
127 | |
128 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; |
129 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; |
130 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; |
131 | |
132 | /* Statistics */ |
133 | struct netfront_stats __percpu *stats; |
134 | |
135 | unsigned long rx_gso_checksum_fixup; |
136 | }; |
137 | |
138 | struct netfront_rx_info { |
139 | struct xen_netif_rx_response rx; |
140 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; |
141 | }; |
142 | |
143 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
144 | { |
145 | list->link = id; |
146 | } |
147 | |
148 | static int skb_entry_is_link(const union skb_entry *list) |
149 | { |
150 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); |
151 | return (unsigned long)list->skb < PAGE_OFFSET; |
152 | } |
153 | |
154 | /* |
155 | * Access macros for acquiring freeing slots in tx_skbs[]. |
156 | */ |
157 | |
158 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, |
159 | unsigned short id) |
160 | { |
161 | skb_entry_set_link(&list[id], *head); |
162 | *head = id; |
163 | } |
164 | |
165 | static unsigned short get_id_from_freelist(unsigned *head, |
166 | union skb_entry *list) |
167 | { |
168 | unsigned int id = *head; |
169 | *head = list[id].link; |
170 | return id; |
171 | } |
172 | |
173 | static int xennet_rxidx(RING_IDX idx) |
174 | { |
175 | return idx & (NET_RX_RING_SIZE - 1); |
176 | } |
177 | |
178 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, |
179 | RING_IDX ri) |
180 | { |
181 | int i = xennet_rxidx(ri); |
182 | struct sk_buff *skb = np->rx_skbs[i]; |
183 | np->rx_skbs[i] = NULL; |
184 | return skb; |
185 | } |
186 | |
187 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, |
188 | RING_IDX ri) |
189 | { |
190 | int i = xennet_rxidx(ri); |
191 | grant_ref_t ref = np->grant_rx_ref[i]; |
192 | np->grant_rx_ref[i] = GRANT_INVALID_REF; |
193 | return ref; |
194 | } |
195 | |
196 | #ifdef CONFIG_SYSFS |
197 | static int xennet_sysfs_addif(struct net_device *netdev); |
198 | static void xennet_sysfs_delif(struct net_device *netdev); |
199 | #else /* !CONFIG_SYSFS */ |
200 | #define xennet_sysfs_addif(dev) (0) |
201 | #define xennet_sysfs_delif(dev) do { } while (0) |
202 | #endif |
203 | |
204 | static bool xennet_can_sg(struct net_device *dev) |
205 | { |
206 | return dev->features & NETIF_F_SG; |
207 | } |
208 | |
209 | |
210 | static void rx_refill_timeout(unsigned long data) |
211 | { |
212 | struct net_device *dev = (struct net_device *)data; |
213 | struct netfront_info *np = netdev_priv(dev); |
214 | napi_schedule(&np->napi); |
215 | } |
216 | |
217 | static int netfront_tx_slot_available(struct netfront_info *np) |
218 | { |
219 | return (np->tx.req_prod_pvt - np->tx.rsp_cons) < |
220 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2); |
221 | } |
222 | |
223 | static void xennet_maybe_wake_tx(struct net_device *dev) |
224 | { |
225 | struct netfront_info *np = netdev_priv(dev); |
226 | |
227 | if (unlikely(netif_queue_stopped(dev)) && |
228 | netfront_tx_slot_available(np) && |
229 | likely(netif_running(dev))) |
230 | netif_wake_queue(dev); |
231 | } |
232 | |
233 | static void xennet_alloc_rx_buffers(struct net_device *dev) |
234 | { |
235 | unsigned short id; |
236 | struct netfront_info *np = netdev_priv(dev); |
237 | struct sk_buff *skb; |
238 | struct page *page; |
239 | int i, batch_target, notify; |
240 | RING_IDX req_prod = np->rx.req_prod_pvt; |
241 | grant_ref_t ref; |
242 | unsigned long pfn; |
243 | void *vaddr; |
244 | struct xen_netif_rx_request *req; |
245 | |
246 | if (unlikely(!netif_carrier_ok(dev))) |
247 | return; |
248 | |
249 | /* |
250 | * Allocate skbuffs greedily, even though we batch updates to the |
251 | * receive ring. This creates a less bursty demand on the memory |
252 | * allocator, so should reduce the chance of failed allocation requests |
253 | * both for ourself and for other kernel subsystems. |
254 | */ |
255 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); |
256 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { |
257 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, |
258 | GFP_ATOMIC | __GFP_NOWARN); |
259 | if (unlikely(!skb)) |
260 | goto no_skb; |
261 | |
262 | /* Align ip header to a 16 bytes boundary */ |
263 | skb_reserve(skb, NET_IP_ALIGN); |
264 | |
265 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
266 | if (!page) { |
267 | kfree_skb(skb); |
268 | no_skb: |
269 | /* Any skbuffs queued for refill? Force them out. */ |
270 | if (i != 0) |
271 | goto refill; |
272 | /* Could not allocate any skbuffs. Try again later. */ |
273 | mod_timer(&np->rx_refill_timer, |
274 | jiffies + (HZ/10)); |
275 | break; |
276 | } |
277 | |
278 | __skb_fill_page_desc(skb, 0, page, 0, 0); |
279 | skb_shinfo(skb)->nr_frags = 1; |
280 | __skb_queue_tail(&np->rx_batch, skb); |
281 | } |
282 | |
283 | /* Is the batch large enough to be worthwhile? */ |
284 | if (i < (np->rx_target/2)) { |
285 | if (req_prod > np->rx.sring->req_prod) |
286 | goto push; |
287 | return; |
288 | } |
289 | |
290 | /* Adjust our fill target if we risked running out of buffers. */ |
291 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && |
292 | ((np->rx_target *= 2) > np->rx_max_target)) |
293 | np->rx_target = np->rx_max_target; |
294 | |
295 | refill: |
296 | for (i = 0; ; i++) { |
297 | skb = __skb_dequeue(&np->rx_batch); |
298 | if (skb == NULL) |
299 | break; |
300 | |
301 | skb->dev = dev; |
302 | |
303 | id = xennet_rxidx(req_prod + i); |
304 | |
305 | BUG_ON(np->rx_skbs[id]); |
306 | np->rx_skbs[id] = skb; |
307 | |
308 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); |
309 | BUG_ON((signed short)ref < 0); |
310 | np->grant_rx_ref[id] = ref; |
311 | |
312 | pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); |
313 | vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0])); |
314 | |
315 | req = RING_GET_REQUEST(&np->rx, req_prod + i); |
316 | gnttab_grant_foreign_access_ref(ref, |
317 | np->xbdev->otherend_id, |
318 | pfn_to_mfn(pfn), |
319 | 0); |
320 | |
321 | req->id = id; |
322 | req->gref = ref; |
323 | } |
324 | |
325 | wmb(); /* barrier so backend seens requests */ |
326 | |
327 | /* Above is a suitable barrier to ensure backend will see requests. */ |
328 | np->rx.req_prod_pvt = req_prod + i; |
329 | push: |
330 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); |
331 | if (notify) |
332 | notify_remote_via_irq(np->netdev->irq); |
333 | } |
334 | |
335 | static int xennet_open(struct net_device *dev) |
336 | { |
337 | struct netfront_info *np = netdev_priv(dev); |
338 | |
339 | napi_enable(&np->napi); |
340 | |
341 | spin_lock_bh(&np->rx_lock); |
342 | if (netif_carrier_ok(dev)) { |
343 | xennet_alloc_rx_buffers(dev); |
344 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; |
345 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) |
346 | napi_schedule(&np->napi); |
347 | } |
348 | spin_unlock_bh(&np->rx_lock); |
349 | |
350 | netif_start_queue(dev); |
351 | |
352 | return 0; |
353 | } |
354 | |
355 | static void xennet_tx_buf_gc(struct net_device *dev) |
356 | { |
357 | RING_IDX cons, prod; |
358 | unsigned short id; |
359 | struct netfront_info *np = netdev_priv(dev); |
360 | struct sk_buff *skb; |
361 | |
362 | BUG_ON(!netif_carrier_ok(dev)); |
363 | |
364 | do { |
365 | prod = np->tx.sring->rsp_prod; |
366 | rmb(); /* Ensure we see responses up to 'rp'. */ |
367 | |
368 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { |
369 | struct xen_netif_tx_response *txrsp; |
370 | |
371 | txrsp = RING_GET_RESPONSE(&np->tx, cons); |
372 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
373 | continue; |
374 | |
375 | id = txrsp->id; |
376 | skb = np->tx_skbs[id].skb; |
377 | if (unlikely(gnttab_query_foreign_access( |
378 | np->grant_tx_ref[id]) != 0)) { |
379 | printk(KERN_ALERT "xennet_tx_buf_gc: warning " |
380 | "-- grant still in use by backend " |
381 | "domain.\n"); |
382 | BUG(); |
383 | } |
384 | gnttab_end_foreign_access_ref( |
385 | np->grant_tx_ref[id], GNTMAP_readonly); |
386 | gnttab_release_grant_reference( |
387 | &np->gref_tx_head, np->grant_tx_ref[id]); |
388 | np->grant_tx_ref[id] = GRANT_INVALID_REF; |
389 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); |
390 | dev_kfree_skb_irq(skb); |
391 | } |
392 | |
393 | np->tx.rsp_cons = prod; |
394 | |
395 | /* |
396 | * Set a new event, then check for race with update of tx_cons. |
397 | * Note that it is essential to schedule a callback, no matter |
398 | * how few buffers are pending. Even if there is space in the |
399 | * transmit ring, higher layers may be blocked because too much |
400 | * data is outstanding: in such cases notification from Xen is |
401 | * likely to be the only kick that we'll get. |
402 | */ |
403 | np->tx.sring->rsp_event = |
404 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; |
405 | mb(); /* update shared area */ |
406 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); |
407 | |
408 | xennet_maybe_wake_tx(dev); |
409 | } |
410 | |
411 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, |
412 | struct xen_netif_tx_request *tx) |
413 | { |
414 | struct netfront_info *np = netdev_priv(dev); |
415 | char *data = skb->data; |
416 | unsigned long mfn; |
417 | RING_IDX prod = np->tx.req_prod_pvt; |
418 | int frags = skb_shinfo(skb)->nr_frags; |
419 | unsigned int offset = offset_in_page(data); |
420 | unsigned int len = skb_headlen(skb); |
421 | unsigned int id; |
422 | grant_ref_t ref; |
423 | int i; |
424 | |
425 | /* While the header overlaps a page boundary (including being |
426 | larger than a page), split it it into page-sized chunks. */ |
427 | while (len > PAGE_SIZE - offset) { |
428 | tx->size = PAGE_SIZE - offset; |
429 | tx->flags |= XEN_NETTXF_more_data; |
430 | len -= tx->size; |
431 | data += tx->size; |
432 | offset = 0; |
433 | |
434 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); |
435 | np->tx_skbs[id].skb = skb_get(skb); |
436 | tx = RING_GET_REQUEST(&np->tx, prod++); |
437 | tx->id = id; |
438 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); |
439 | BUG_ON((signed short)ref < 0); |
440 | |
441 | mfn = virt_to_mfn(data); |
442 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, |
443 | mfn, GNTMAP_readonly); |
444 | |
445 | tx->gref = np->grant_tx_ref[id] = ref; |
446 | tx->offset = offset; |
447 | tx->size = len; |
448 | tx->flags = 0; |
449 | } |
450 | |
451 | /* Grant backend access to each skb fragment page. */ |
452 | for (i = 0; i < frags; i++) { |
453 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; |
454 | |
455 | tx->flags |= XEN_NETTXF_more_data; |
456 | |
457 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); |
458 | np->tx_skbs[id].skb = skb_get(skb); |
459 | tx = RING_GET_REQUEST(&np->tx, prod++); |
460 | tx->id = id; |
461 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); |
462 | BUG_ON((signed short)ref < 0); |
463 | |
464 | mfn = pfn_to_mfn(page_to_pfn(skb_frag_page(frag))); |
465 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, |
466 | mfn, GNTMAP_readonly); |
467 | |
468 | tx->gref = np->grant_tx_ref[id] = ref; |
469 | tx->offset = frag->page_offset; |
470 | tx->size = skb_frag_size(frag); |
471 | tx->flags = 0; |
472 | } |
473 | |
474 | np->tx.req_prod_pvt = prod; |
475 | } |
476 | |
477 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
478 | { |
479 | unsigned short id; |
480 | struct netfront_info *np = netdev_priv(dev); |
481 | struct netfront_stats *stats = this_cpu_ptr(np->stats); |
482 | struct xen_netif_tx_request *tx; |
483 | struct xen_netif_extra_info *extra; |
484 | char *data = skb->data; |
485 | RING_IDX i; |
486 | grant_ref_t ref; |
487 | unsigned long mfn; |
488 | int notify; |
489 | int frags = skb_shinfo(skb)->nr_frags; |
490 | unsigned int offset = offset_in_page(data); |
491 | unsigned int len = skb_headlen(skb); |
492 | unsigned long flags; |
493 | |
494 | frags += DIV_ROUND_UP(offset + len, PAGE_SIZE); |
495 | if (unlikely(frags > MAX_SKB_FRAGS + 1)) { |
496 | printk(KERN_ALERT "xennet: skb rides the rocket: %d frags\n", |
497 | frags); |
498 | dump_stack(); |
499 | goto drop; |
500 | } |
501 | |
502 | spin_lock_irqsave(&np->tx_lock, flags); |
503 | |
504 | if (unlikely(!netif_carrier_ok(dev) || |
505 | (frags > 1 && !xennet_can_sg(dev)) || |
506 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
507 | spin_unlock_irqrestore(&np->tx_lock, flags); |
508 | goto drop; |
509 | } |
510 | |
511 | i = np->tx.req_prod_pvt; |
512 | |
513 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); |
514 | np->tx_skbs[id].skb = skb; |
515 | |
516 | tx = RING_GET_REQUEST(&np->tx, i); |
517 | |
518 | tx->id = id; |
519 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); |
520 | BUG_ON((signed short)ref < 0); |
521 | mfn = virt_to_mfn(data); |
522 | gnttab_grant_foreign_access_ref( |
523 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); |
524 | tx->gref = np->grant_tx_ref[id] = ref; |
525 | tx->offset = offset; |
526 | tx->size = len; |
527 | extra = NULL; |
528 | |
529 | tx->flags = 0; |
530 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
531 | /* local packet? */ |
532 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
533 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
534 | /* remote but checksummed. */ |
535 | tx->flags |= XEN_NETTXF_data_validated; |
536 | |
537 | if (skb_shinfo(skb)->gso_size) { |
538 | struct xen_netif_extra_info *gso; |
539 | |
540 | gso = (struct xen_netif_extra_info *) |
541 | RING_GET_REQUEST(&np->tx, ++i); |
542 | |
543 | if (extra) |
544 | extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; |
545 | else |
546 | tx->flags |= XEN_NETTXF_extra_info; |
547 | |
548 | gso->u.gso.size = skb_shinfo(skb)->gso_size; |
549 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; |
550 | gso->u.gso.pad = 0; |
551 | gso->u.gso.features = 0; |
552 | |
553 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; |
554 | gso->flags = 0; |
555 | extra = gso; |
556 | } |
557 | |
558 | np->tx.req_prod_pvt = i + 1; |
559 | |
560 | xennet_make_frags(skb, dev, tx); |
561 | tx->size = skb->len; |
562 | |
563 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); |
564 | if (notify) |
565 | notify_remote_via_irq(np->netdev->irq); |
566 | |
567 | u64_stats_update_begin(&stats->syncp); |
568 | stats->tx_bytes += skb->len; |
569 | stats->tx_packets++; |
570 | u64_stats_update_end(&stats->syncp); |
571 | |
572 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ |
573 | xennet_tx_buf_gc(dev); |
574 | |
575 | if (!netfront_tx_slot_available(np)) |
576 | netif_stop_queue(dev); |
577 | |
578 | spin_unlock_irqrestore(&np->tx_lock, flags); |
579 | |
580 | return NETDEV_TX_OK; |
581 | |
582 | drop: |
583 | dev->stats.tx_dropped++; |
584 | dev_kfree_skb(skb); |
585 | return NETDEV_TX_OK; |
586 | } |
587 | |
588 | static int xennet_close(struct net_device *dev) |
589 | { |
590 | struct netfront_info *np = netdev_priv(dev); |
591 | netif_stop_queue(np->netdev); |
592 | napi_disable(&np->napi); |
593 | return 0; |
594 | } |
595 | |
596 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
597 | grant_ref_t ref) |
598 | { |
599 | int new = xennet_rxidx(np->rx.req_prod_pvt); |
600 | |
601 | BUG_ON(np->rx_skbs[new]); |
602 | np->rx_skbs[new] = skb; |
603 | np->grant_rx_ref[new] = ref; |
604 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; |
605 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; |
606 | np->rx.req_prod_pvt++; |
607 | } |
608 | |
609 | static int xennet_get_extras(struct netfront_info *np, |
610 | struct xen_netif_extra_info *extras, |
611 | RING_IDX rp) |
612 | |
613 | { |
614 | struct xen_netif_extra_info *extra; |
615 | struct device *dev = &np->netdev->dev; |
616 | RING_IDX cons = np->rx.rsp_cons; |
617 | int err = 0; |
618 | |
619 | do { |
620 | struct sk_buff *skb; |
621 | grant_ref_t ref; |
622 | |
623 | if (unlikely(cons + 1 == rp)) { |
624 | if (net_ratelimit()) |
625 | dev_warn(dev, "Missing extra info\n"); |
626 | err = -EBADR; |
627 | break; |
628 | } |
629 | |
630 | extra = (struct xen_netif_extra_info *) |
631 | RING_GET_RESPONSE(&np->rx, ++cons); |
632 | |
633 | if (unlikely(!extra->type || |
634 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { |
635 | if (net_ratelimit()) |
636 | dev_warn(dev, "Invalid extra type: %d\n", |
637 | extra->type); |
638 | err = -EINVAL; |
639 | } else { |
640 | memcpy(&extras[extra->type - 1], extra, |
641 | sizeof(*extra)); |
642 | } |
643 | |
644 | skb = xennet_get_rx_skb(np, cons); |
645 | ref = xennet_get_rx_ref(np, cons); |
646 | xennet_move_rx_slot(np, skb, ref); |
647 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); |
648 | |
649 | np->rx.rsp_cons = cons; |
650 | return err; |
651 | } |
652 | |
653 | static int xennet_get_responses(struct netfront_info *np, |
654 | struct netfront_rx_info *rinfo, RING_IDX rp, |
655 | struct sk_buff_head *list) |
656 | { |
657 | struct xen_netif_rx_response *rx = &rinfo->rx; |
658 | struct xen_netif_extra_info *extras = rinfo->extras; |
659 | struct device *dev = &np->netdev->dev; |
660 | RING_IDX cons = np->rx.rsp_cons; |
661 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); |
662 | grant_ref_t ref = xennet_get_rx_ref(np, cons); |
663 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); |
664 | int frags = 1; |
665 | int err = 0; |
666 | unsigned long ret; |
667 | |
668 | if (rx->flags & XEN_NETRXF_extra_info) { |
669 | err = xennet_get_extras(np, extras, rp); |
670 | cons = np->rx.rsp_cons; |
671 | } |
672 | |
673 | for (;;) { |
674 | if (unlikely(rx->status < 0 || |
675 | rx->offset + rx->status > PAGE_SIZE)) { |
676 | if (net_ratelimit()) |
677 | dev_warn(dev, "rx->offset: %x, size: %u\n", |
678 | rx->offset, rx->status); |
679 | xennet_move_rx_slot(np, skb, ref); |
680 | err = -EINVAL; |
681 | goto next; |
682 | } |
683 | |
684 | /* |
685 | * This definitely indicates a bug, either in this driver or in |
686 | * the backend driver. In future this should flag the bad |
687 | * situation to the system controller to reboot the backed. |
688 | */ |
689 | if (ref == GRANT_INVALID_REF) { |
690 | if (net_ratelimit()) |
691 | dev_warn(dev, "Bad rx response id %d.\n", |
692 | rx->id); |
693 | err = -EINVAL; |
694 | goto next; |
695 | } |
696 | |
697 | ret = gnttab_end_foreign_access_ref(ref, 0); |
698 | BUG_ON(!ret); |
699 | |
700 | gnttab_release_grant_reference(&np->gref_rx_head, ref); |
701 | |
702 | __skb_queue_tail(list, skb); |
703 | |
704 | next: |
705 | if (!(rx->flags & XEN_NETRXF_more_data)) |
706 | break; |
707 | |
708 | if (cons + frags == rp) { |
709 | if (net_ratelimit()) |
710 | dev_warn(dev, "Need more frags\n"); |
711 | err = -ENOENT; |
712 | break; |
713 | } |
714 | |
715 | rx = RING_GET_RESPONSE(&np->rx, cons + frags); |
716 | skb = xennet_get_rx_skb(np, cons + frags); |
717 | ref = xennet_get_rx_ref(np, cons + frags); |
718 | frags++; |
719 | } |
720 | |
721 | if (unlikely(frags > max)) { |
722 | if (net_ratelimit()) |
723 | dev_warn(dev, "Too many frags\n"); |
724 | err = -E2BIG; |
725 | } |
726 | |
727 | if (unlikely(err)) |
728 | np->rx.rsp_cons = cons + frags; |
729 | |
730 | return err; |
731 | } |
732 | |
733 | static int xennet_set_skb_gso(struct sk_buff *skb, |
734 | struct xen_netif_extra_info *gso) |
735 | { |
736 | if (!gso->u.gso.size) { |
737 | if (net_ratelimit()) |
738 | printk(KERN_WARNING "GSO size must not be zero.\n"); |
739 | return -EINVAL; |
740 | } |
741 | |
742 | /* Currently only TCPv4 S.O. is supported. */ |
743 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { |
744 | if (net_ratelimit()) |
745 | printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); |
746 | return -EINVAL; |
747 | } |
748 | |
749 | skb_shinfo(skb)->gso_size = gso->u.gso.size; |
750 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
751 | |
752 | /* Header must be checked, and gso_segs computed. */ |
753 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
754 | skb_shinfo(skb)->gso_segs = 0; |
755 | |
756 | return 0; |
757 | } |
758 | |
759 | static RING_IDX xennet_fill_frags(struct netfront_info *np, |
760 | struct sk_buff *skb, |
761 | struct sk_buff_head *list) |
762 | { |
763 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
764 | int nr_frags = shinfo->nr_frags; |
765 | RING_IDX cons = np->rx.rsp_cons; |
766 | struct sk_buff *nskb; |
767 | |
768 | while ((nskb = __skb_dequeue(list))) { |
769 | struct xen_netif_rx_response *rx = |
770 | RING_GET_RESPONSE(&np->rx, ++cons); |
771 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
772 | |
773 | __skb_fill_page_desc(skb, nr_frags, |
774 | skb_frag_page(nfrag), |
775 | rx->offset, rx->status); |
776 | |
777 | skb->data_len += rx->status; |
778 | |
779 | skb_shinfo(nskb)->nr_frags = 0; |
780 | kfree_skb(nskb); |
781 | |
782 | nr_frags++; |
783 | } |
784 | |
785 | shinfo->nr_frags = nr_frags; |
786 | return cons; |
787 | } |
788 | |
789 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
790 | { |
791 | struct iphdr *iph; |
792 | unsigned char *th; |
793 | int err = -EPROTO; |
794 | int recalculate_partial_csum = 0; |
795 | |
796 | /* |
797 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy |
798 | * peers can fail to set NETRXF_csum_blank when sending a GSO |
799 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and |
800 | * recalculate the partial checksum. |
801 | */ |
802 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { |
803 | struct netfront_info *np = netdev_priv(dev); |
804 | np->rx_gso_checksum_fixup++; |
805 | skb->ip_summed = CHECKSUM_PARTIAL; |
806 | recalculate_partial_csum = 1; |
807 | } |
808 | |
809 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ |
810 | if (skb->ip_summed != CHECKSUM_PARTIAL) |
811 | return 0; |
812 | |
813 | if (skb->protocol != htons(ETH_P_IP)) |
814 | goto out; |
815 | |
816 | iph = (void *)skb->data; |
817 | th = skb->data + 4 * iph->ihl; |
818 | if (th >= skb_tail_pointer(skb)) |
819 | goto out; |
820 | |
821 | skb->csum_start = th - skb->head; |
822 | switch (iph->protocol) { |
823 | case IPPROTO_TCP: |
824 | skb->csum_offset = offsetof(struct tcphdr, check); |
825 | |
826 | if (recalculate_partial_csum) { |
827 | struct tcphdr *tcph = (struct tcphdr *)th; |
828 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, |
829 | skb->len - iph->ihl*4, |
830 | IPPROTO_TCP, 0); |
831 | } |
832 | break; |
833 | case IPPROTO_UDP: |
834 | skb->csum_offset = offsetof(struct udphdr, check); |
835 | |
836 | if (recalculate_partial_csum) { |
837 | struct udphdr *udph = (struct udphdr *)th; |
838 | udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, |
839 | skb->len - iph->ihl*4, |
840 | IPPROTO_UDP, 0); |
841 | } |
842 | break; |
843 | default: |
844 | if (net_ratelimit()) |
845 | printk(KERN_ERR "Attempting to checksum a non-" |
846 | "TCP/UDP packet, dropping a protocol" |
847 | " %d packet", iph->protocol); |
848 | goto out; |
849 | } |
850 | |
851 | if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) |
852 | goto out; |
853 | |
854 | err = 0; |
855 | |
856 | out: |
857 | return err; |
858 | } |
859 | |
860 | static int handle_incoming_queue(struct net_device *dev, |
861 | struct sk_buff_head *rxq) |
862 | { |
863 | struct netfront_info *np = netdev_priv(dev); |
864 | struct netfront_stats *stats = this_cpu_ptr(np->stats); |
865 | int packets_dropped = 0; |
866 | struct sk_buff *skb; |
867 | |
868 | while ((skb = __skb_dequeue(rxq)) != NULL) { |
869 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
870 | |
871 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
872 | |
873 | /* Ethernet work: Delayed to here as it peeks the header. */ |
874 | skb->protocol = eth_type_trans(skb, dev); |
875 | |
876 | if (checksum_setup(dev, skb)) { |
877 | kfree_skb(skb); |
878 | packets_dropped++; |
879 | dev->stats.rx_errors++; |
880 | continue; |
881 | } |
882 | |
883 | u64_stats_update_begin(&stats->syncp); |
884 | stats->rx_packets++; |
885 | stats->rx_bytes += skb->len; |
886 | u64_stats_update_end(&stats->syncp); |
887 | |
888 | /* Pass it up. */ |
889 | netif_receive_skb(skb); |
890 | } |
891 | |
892 | return packets_dropped; |
893 | } |
894 | |
895 | static int xennet_poll(struct napi_struct *napi, int budget) |
896 | { |
897 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
898 | struct net_device *dev = np->netdev; |
899 | struct sk_buff *skb; |
900 | struct netfront_rx_info rinfo; |
901 | struct xen_netif_rx_response *rx = &rinfo.rx; |
902 | struct xen_netif_extra_info *extras = rinfo.extras; |
903 | RING_IDX i, rp; |
904 | int work_done; |
905 | struct sk_buff_head rxq; |
906 | struct sk_buff_head errq; |
907 | struct sk_buff_head tmpq; |
908 | unsigned long flags; |
909 | int err; |
910 | |
911 | spin_lock(&np->rx_lock); |
912 | |
913 | skb_queue_head_init(&rxq); |
914 | skb_queue_head_init(&errq); |
915 | skb_queue_head_init(&tmpq); |
916 | |
917 | rp = np->rx.sring->rsp_prod; |
918 | rmb(); /* Ensure we see queued responses up to 'rp'. */ |
919 | |
920 | i = np->rx.rsp_cons; |
921 | work_done = 0; |
922 | while ((i != rp) && (work_done < budget)) { |
923 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); |
924 | memset(extras, 0, sizeof(rinfo.extras)); |
925 | |
926 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); |
927 | |
928 | if (unlikely(err)) { |
929 | err: |
930 | while ((skb = __skb_dequeue(&tmpq))) |
931 | __skb_queue_tail(&errq, skb); |
932 | dev->stats.rx_errors++; |
933 | i = np->rx.rsp_cons; |
934 | continue; |
935 | } |
936 | |
937 | skb = __skb_dequeue(&tmpq); |
938 | |
939 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
940 | struct xen_netif_extra_info *gso; |
941 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; |
942 | |
943 | if (unlikely(xennet_set_skb_gso(skb, gso))) { |
944 | __skb_queue_head(&tmpq, skb); |
945 | np->rx.rsp_cons += skb_queue_len(&tmpq); |
946 | goto err; |
947 | } |
948 | } |
949 | |
950 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
951 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) |
952 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; |
953 | |
954 | skb_shinfo(skb)->frags[0].page_offset = rx->offset; |
955 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); |
956 | skb->data_len = rx->status; |
957 | |
958 | i = xennet_fill_frags(np, skb, &tmpq); |
959 | |
960 | /* |
961 | * Truesize approximates the size of true data plus |
962 | * any supervisor overheads. Adding hypervisor |
963 | * overheads has been shown to significantly reduce |
964 | * achievable bandwidth with the default receive |
965 | * buffer size. It is therefore not wise to account |
966 | * for it here. |
967 | * |
968 | * After alloc_skb(RX_COPY_THRESHOLD), truesize is set |
969 | * to RX_COPY_THRESHOLD + the supervisor |
970 | * overheads. Here, we add the size of the data pulled |
971 | * in xennet_fill_frags(). |
972 | * |
973 | * We also adjust for any unused space in the main |
974 | * data area by subtracting (RX_COPY_THRESHOLD - |
975 | * len). This is especially important with drivers |
976 | * which split incoming packets into header and data, |
977 | * using only 66 bytes of the main data area (see the |
978 | * e1000 driver for example.) On such systems, |
979 | * without this last adjustement, our achievable |
980 | * receive throughout using the standard receive |
981 | * buffer size was cut by 25%(!!!). |
982 | */ |
983 | skb->truesize += skb->data_len - RX_COPY_THRESHOLD; |
984 | skb->len += skb->data_len; |
985 | |
986 | if (rx->flags & XEN_NETRXF_csum_blank) |
987 | skb->ip_summed = CHECKSUM_PARTIAL; |
988 | else if (rx->flags & XEN_NETRXF_data_validated) |
989 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
990 | |
991 | __skb_queue_tail(&rxq, skb); |
992 | |
993 | np->rx.rsp_cons = ++i; |
994 | work_done++; |
995 | } |
996 | |
997 | __skb_queue_purge(&errq); |
998 | |
999 | work_done -= handle_incoming_queue(dev, &rxq); |
1000 | |
1001 | /* If we get a callback with very few responses, reduce fill target. */ |
1002 | /* NB. Note exponential increase, linear decrease. */ |
1003 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > |
1004 | ((3*np->rx_target) / 4)) && |
1005 | (--np->rx_target < np->rx_min_target)) |
1006 | np->rx_target = np->rx_min_target; |
1007 | |
1008 | xennet_alloc_rx_buffers(dev); |
1009 | |
1010 | if (work_done < budget) { |
1011 | int more_to_do = 0; |
1012 | |
1013 | local_irq_save(flags); |
1014 | |
1015 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); |
1016 | if (!more_to_do) |
1017 | __napi_complete(napi); |
1018 | |
1019 | local_irq_restore(flags); |
1020 | } |
1021 | |
1022 | spin_unlock(&np->rx_lock); |
1023 | |
1024 | return work_done; |
1025 | } |
1026 | |
1027 | static int xennet_change_mtu(struct net_device *dev, int mtu) |
1028 | { |
1029 | int max = xennet_can_sg(dev) ? 65535 - ETH_HLEN : ETH_DATA_LEN; |
1030 | |
1031 | if (mtu > max) |
1032 | return -EINVAL; |
1033 | dev->mtu = mtu; |
1034 | return 0; |
1035 | } |
1036 | |
1037 | static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, |
1038 | struct rtnl_link_stats64 *tot) |
1039 | { |
1040 | struct netfront_info *np = netdev_priv(dev); |
1041 | int cpu; |
1042 | |
1043 | for_each_possible_cpu(cpu) { |
1044 | struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu); |
1045 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
1046 | unsigned int start; |
1047 | |
1048 | do { |
1049 | start = u64_stats_fetch_begin_bh(&stats->syncp); |
1050 | |
1051 | rx_packets = stats->rx_packets; |
1052 | tx_packets = stats->tx_packets; |
1053 | rx_bytes = stats->rx_bytes; |
1054 | tx_bytes = stats->tx_bytes; |
1055 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); |
1056 | |
1057 | tot->rx_packets += rx_packets; |
1058 | tot->tx_packets += tx_packets; |
1059 | tot->rx_bytes += rx_bytes; |
1060 | tot->tx_bytes += tx_bytes; |
1061 | } |
1062 | |
1063 | tot->rx_errors = dev->stats.rx_errors; |
1064 | tot->tx_dropped = dev->stats.tx_dropped; |
1065 | |
1066 | return tot; |
1067 | } |
1068 | |
1069 | static void xennet_release_tx_bufs(struct netfront_info *np) |
1070 | { |
1071 | struct sk_buff *skb; |
1072 | int i; |
1073 | |
1074 | for (i = 0; i < NET_TX_RING_SIZE; i++) { |
1075 | /* Skip over entries which are actually freelist references */ |
1076 | if (skb_entry_is_link(&np->tx_skbs[i])) |
1077 | continue; |
1078 | |
1079 | skb = np->tx_skbs[i].skb; |
1080 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], |
1081 | GNTMAP_readonly); |
1082 | gnttab_release_grant_reference(&np->gref_tx_head, |
1083 | np->grant_tx_ref[i]); |
1084 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1085 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); |
1086 | dev_kfree_skb_irq(skb); |
1087 | } |
1088 | } |
1089 | |
1090 | static void xennet_release_rx_bufs(struct netfront_info *np) |
1091 | { |
1092 | struct mmu_update *mmu = np->rx_mmu; |
1093 | struct multicall_entry *mcl = np->rx_mcl; |
1094 | struct sk_buff_head free_list; |
1095 | struct sk_buff *skb; |
1096 | unsigned long mfn; |
1097 | int xfer = 0, noxfer = 0, unused = 0; |
1098 | int id, ref; |
1099 | |
1100 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", |
1101 | __func__); |
1102 | return; |
1103 | |
1104 | skb_queue_head_init(&free_list); |
1105 | |
1106 | spin_lock_bh(&np->rx_lock); |
1107 | |
1108 | for (id = 0; id < NET_RX_RING_SIZE; id++) { |
1109 | ref = np->grant_rx_ref[id]; |
1110 | if (ref == GRANT_INVALID_REF) { |
1111 | unused++; |
1112 | continue; |
1113 | } |
1114 | |
1115 | skb = np->rx_skbs[id]; |
1116 | mfn = gnttab_end_foreign_transfer_ref(ref); |
1117 | gnttab_release_grant_reference(&np->gref_rx_head, ref); |
1118 | np->grant_rx_ref[id] = GRANT_INVALID_REF; |
1119 | |
1120 | if (0 == mfn) { |
1121 | skb_shinfo(skb)->nr_frags = 0; |
1122 | dev_kfree_skb(skb); |
1123 | noxfer++; |
1124 | continue; |
1125 | } |
1126 | |
1127 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
1128 | /* Remap the page. */ |
1129 | const struct page *page = |
1130 | skb_frag_page(&skb_shinfo(skb)->frags[0]); |
1131 | unsigned long pfn = page_to_pfn(page); |
1132 | void *vaddr = page_address(page); |
1133 | |
1134 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, |
1135 | mfn_pte(mfn, PAGE_KERNEL), |
1136 | 0); |
1137 | mcl++; |
1138 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) |
1139 | | MMU_MACHPHYS_UPDATE; |
1140 | mmu->val = pfn; |
1141 | mmu++; |
1142 | |
1143 | set_phys_to_machine(pfn, mfn); |
1144 | } |
1145 | __skb_queue_tail(&free_list, skb); |
1146 | xfer++; |
1147 | } |
1148 | |
1149 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", |
1150 | __func__, xfer, noxfer, unused); |
1151 | |
1152 | if (xfer) { |
1153 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
1154 | /* Do all the remapping work and M2P updates. */ |
1155 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, |
1156 | NULL, DOMID_SELF); |
1157 | mcl++; |
1158 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); |
1159 | } |
1160 | } |
1161 | |
1162 | __skb_queue_purge(&free_list); |
1163 | |
1164 | spin_unlock_bh(&np->rx_lock); |
1165 | } |
1166 | |
1167 | static void xennet_uninit(struct net_device *dev) |
1168 | { |
1169 | struct netfront_info *np = netdev_priv(dev); |
1170 | xennet_release_tx_bufs(np); |
1171 | xennet_release_rx_bufs(np); |
1172 | gnttab_free_grant_references(np->gref_tx_head); |
1173 | gnttab_free_grant_references(np->gref_rx_head); |
1174 | } |
1175 | |
1176 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
1177 | netdev_features_t features) |
1178 | { |
1179 | struct netfront_info *np = netdev_priv(dev); |
1180 | int val; |
1181 | |
1182 | if (features & NETIF_F_SG) { |
1183 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", |
1184 | "%d", &val) < 0) |
1185 | val = 0; |
1186 | |
1187 | if (!val) |
1188 | features &= ~NETIF_F_SG; |
1189 | } |
1190 | |
1191 | if (features & NETIF_F_TSO) { |
1192 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, |
1193 | "feature-gso-tcpv4", "%d", &val) < 0) |
1194 | val = 0; |
1195 | |
1196 | if (!val) |
1197 | features &= ~NETIF_F_TSO; |
1198 | } |
1199 | |
1200 | return features; |
1201 | } |
1202 | |
1203 | static int xennet_set_features(struct net_device *dev, |
1204 | netdev_features_t features) |
1205 | { |
1206 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { |
1207 | netdev_info(dev, "Reducing MTU because no SG offload"); |
1208 | dev->mtu = ETH_DATA_LEN; |
1209 | } |
1210 | |
1211 | return 0; |
1212 | } |
1213 | |
1214 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
1215 | { |
1216 | struct net_device *dev = dev_id; |
1217 | struct netfront_info *np = netdev_priv(dev); |
1218 | unsigned long flags; |
1219 | |
1220 | spin_lock_irqsave(&np->tx_lock, flags); |
1221 | |
1222 | if (likely(netif_carrier_ok(dev))) { |
1223 | xennet_tx_buf_gc(dev); |
1224 | /* Under tx_lock: protects access to rx shared-ring indexes. */ |
1225 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) |
1226 | napi_schedule(&np->napi); |
1227 | } |
1228 | |
1229 | spin_unlock_irqrestore(&np->tx_lock, flags); |
1230 | |
1231 | return IRQ_HANDLED; |
1232 | } |
1233 | |
1234 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1235 | static void xennet_poll_controller(struct net_device *dev) |
1236 | { |
1237 | xennet_interrupt(0, dev); |
1238 | } |
1239 | #endif |
1240 | |
1241 | static const struct net_device_ops xennet_netdev_ops = { |
1242 | .ndo_open = xennet_open, |
1243 | .ndo_uninit = xennet_uninit, |
1244 | .ndo_stop = xennet_close, |
1245 | .ndo_start_xmit = xennet_start_xmit, |
1246 | .ndo_change_mtu = xennet_change_mtu, |
1247 | .ndo_get_stats64 = xennet_get_stats64, |
1248 | .ndo_set_mac_address = eth_mac_addr, |
1249 | .ndo_validate_addr = eth_validate_addr, |
1250 | .ndo_fix_features = xennet_fix_features, |
1251 | .ndo_set_features = xennet_set_features, |
1252 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1253 | .ndo_poll_controller = xennet_poll_controller, |
1254 | #endif |
1255 | }; |
1256 | |
1257 | static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev) |
1258 | { |
1259 | int i, err; |
1260 | struct net_device *netdev; |
1261 | struct netfront_info *np; |
1262 | |
1263 | netdev = alloc_etherdev(sizeof(struct netfront_info)); |
1264 | if (!netdev) |
1265 | return ERR_PTR(-ENOMEM); |
1266 | |
1267 | np = netdev_priv(netdev); |
1268 | np->xbdev = dev; |
1269 | |
1270 | spin_lock_init(&np->tx_lock); |
1271 | spin_lock_init(&np->rx_lock); |
1272 | |
1273 | skb_queue_head_init(&np->rx_batch); |
1274 | np->rx_target = RX_DFL_MIN_TARGET; |
1275 | np->rx_min_target = RX_DFL_MIN_TARGET; |
1276 | np->rx_max_target = RX_MAX_TARGET; |
1277 | |
1278 | init_timer(&np->rx_refill_timer); |
1279 | np->rx_refill_timer.data = (unsigned long)netdev; |
1280 | np->rx_refill_timer.function = rx_refill_timeout; |
1281 | |
1282 | err = -ENOMEM; |
1283 | np->stats = alloc_percpu(struct netfront_stats); |
1284 | if (np->stats == NULL) |
1285 | goto exit; |
1286 | |
1287 | /* Initialise tx_skbs as a free chain containing every entry. */ |
1288 | np->tx_skb_freelist = 0; |
1289 | for (i = 0; i < NET_TX_RING_SIZE; i++) { |
1290 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
1291 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1292 | } |
1293 | |
1294 | /* Clear out rx_skbs */ |
1295 | for (i = 0; i < NET_RX_RING_SIZE; i++) { |
1296 | np->rx_skbs[i] = NULL; |
1297 | np->grant_rx_ref[i] = GRANT_INVALID_REF; |
1298 | } |
1299 | |
1300 | /* A grant for every tx ring slot */ |
1301 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, |
1302 | &np->gref_tx_head) < 0) { |
1303 | printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); |
1304 | err = -ENOMEM; |
1305 | goto exit_free_stats; |
1306 | } |
1307 | /* A grant for every rx ring slot */ |
1308 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, |
1309 | &np->gref_rx_head) < 0) { |
1310 | printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); |
1311 | err = -ENOMEM; |
1312 | goto exit_free_tx; |
1313 | } |
1314 | |
1315 | netdev->netdev_ops = &xennet_netdev_ops; |
1316 | |
1317 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
1318 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
1319 | NETIF_F_GSO_ROBUST; |
1320 | netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO; |
1321 | |
1322 | /* |
1323 | * Assume that all hw features are available for now. This set |
1324 | * will be adjusted by the call to netdev_update_features() in |
1325 | * xennet_connect() which is the earliest point where we can |
1326 | * negotiate with the backend regarding supported features. |
1327 | */ |
1328 | netdev->features |= netdev->hw_features; |
1329 | |
1330 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); |
1331 | SET_NETDEV_DEV(netdev, &dev->dev); |
1332 | |
1333 | np->netdev = netdev; |
1334 | |
1335 | netif_carrier_off(netdev); |
1336 | |
1337 | return netdev; |
1338 | |
1339 | exit_free_tx: |
1340 | gnttab_free_grant_references(np->gref_tx_head); |
1341 | exit_free_stats: |
1342 | free_percpu(np->stats); |
1343 | exit: |
1344 | free_netdev(netdev); |
1345 | return ERR_PTR(err); |
1346 | } |
1347 | |
1348 | /** |
1349 | * Entry point to this code when a new device is created. Allocate the basic |
1350 | * structures and the ring buffers for communication with the backend, and |
1351 | * inform the backend of the appropriate details for those. |
1352 | */ |
1353 | static int __devinit netfront_probe(struct xenbus_device *dev, |
1354 | const struct xenbus_device_id *id) |
1355 | { |
1356 | int err; |
1357 | struct net_device *netdev; |
1358 | struct netfront_info *info; |
1359 | |
1360 | netdev = xennet_create_dev(dev); |
1361 | if (IS_ERR(netdev)) { |
1362 | err = PTR_ERR(netdev); |
1363 | xenbus_dev_fatal(dev, err, "creating netdev"); |
1364 | return err; |
1365 | } |
1366 | |
1367 | info = netdev_priv(netdev); |
1368 | dev_set_drvdata(&dev->dev, info); |
1369 | |
1370 | err = register_netdev(info->netdev); |
1371 | if (err) { |
1372 | printk(KERN_WARNING "%s: register_netdev err=%d\n", |
1373 | __func__, err); |
1374 | goto fail; |
1375 | } |
1376 | |
1377 | err = xennet_sysfs_addif(info->netdev); |
1378 | if (err) { |
1379 | unregister_netdev(info->netdev); |
1380 | printk(KERN_WARNING "%s: add sysfs failed err=%d\n", |
1381 | __func__, err); |
1382 | goto fail; |
1383 | } |
1384 | |
1385 | return 0; |
1386 | |
1387 | fail: |
1388 | free_netdev(netdev); |
1389 | dev_set_drvdata(&dev->dev, NULL); |
1390 | return err; |
1391 | } |
1392 | |
1393 | static void xennet_end_access(int ref, void *page) |
1394 | { |
1395 | /* This frees the page as a side-effect */ |
1396 | if (ref != GRANT_INVALID_REF) |
1397 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); |
1398 | } |
1399 | |
1400 | static void xennet_disconnect_backend(struct netfront_info *info) |
1401 | { |
1402 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ |
1403 | spin_lock_bh(&info->rx_lock); |
1404 | spin_lock_irq(&info->tx_lock); |
1405 | netif_carrier_off(info->netdev); |
1406 | spin_unlock_irq(&info->tx_lock); |
1407 | spin_unlock_bh(&info->rx_lock); |
1408 | |
1409 | if (info->netdev->irq) |
1410 | unbind_from_irqhandler(info->netdev->irq, info->netdev); |
1411 | info->evtchn = info->netdev->irq = 0; |
1412 | |
1413 | /* End access and free the pages */ |
1414 | xennet_end_access(info->tx_ring_ref, info->tx.sring); |
1415 | xennet_end_access(info->rx_ring_ref, info->rx.sring); |
1416 | |
1417 | info->tx_ring_ref = GRANT_INVALID_REF; |
1418 | info->rx_ring_ref = GRANT_INVALID_REF; |
1419 | info->tx.sring = NULL; |
1420 | info->rx.sring = NULL; |
1421 | } |
1422 | |
1423 | /** |
1424 | * We are reconnecting to the backend, due to a suspend/resume, or a backend |
1425 | * driver restart. We tear down our netif structure and recreate it, but |
1426 | * leave the device-layer structures intact so that this is transparent to the |
1427 | * rest of the kernel. |
1428 | */ |
1429 | static int netfront_resume(struct xenbus_device *dev) |
1430 | { |
1431 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
1432 | |
1433 | dev_dbg(&dev->dev, "%s\n", dev->nodename); |
1434 | |
1435 | xennet_disconnect_backend(info); |
1436 | return 0; |
1437 | } |
1438 | |
1439 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) |
1440 | { |
1441 | char *s, *e, *macstr; |
1442 | int i; |
1443 | |
1444 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); |
1445 | if (IS_ERR(macstr)) |
1446 | return PTR_ERR(macstr); |
1447 | |
1448 | for (i = 0; i < ETH_ALEN; i++) { |
1449 | mac[i] = simple_strtoul(s, &e, 16); |
1450 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { |
1451 | kfree(macstr); |
1452 | return -ENOENT; |
1453 | } |
1454 | s = e+1; |
1455 | } |
1456 | |
1457 | kfree(macstr); |
1458 | return 0; |
1459 | } |
1460 | |
1461 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) |
1462 | { |
1463 | struct xen_netif_tx_sring *txs; |
1464 | struct xen_netif_rx_sring *rxs; |
1465 | int err; |
1466 | struct net_device *netdev = info->netdev; |
1467 | |
1468 | info->tx_ring_ref = GRANT_INVALID_REF; |
1469 | info->rx_ring_ref = GRANT_INVALID_REF; |
1470 | info->rx.sring = NULL; |
1471 | info->tx.sring = NULL; |
1472 | netdev->irq = 0; |
1473 | |
1474 | err = xen_net_read_mac(dev, netdev->dev_addr); |
1475 | if (err) { |
1476 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); |
1477 | goto fail; |
1478 | } |
1479 | |
1480 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
1481 | if (!txs) { |
1482 | err = -ENOMEM; |
1483 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); |
1484 | goto fail; |
1485 | } |
1486 | SHARED_RING_INIT(txs); |
1487 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); |
1488 | |
1489 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); |
1490 | if (err < 0) { |
1491 | free_page((unsigned long)txs); |
1492 | goto fail; |
1493 | } |
1494 | |
1495 | info->tx_ring_ref = err; |
1496 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
1497 | if (!rxs) { |
1498 | err = -ENOMEM; |
1499 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); |
1500 | goto fail; |
1501 | } |
1502 | SHARED_RING_INIT(rxs); |
1503 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); |
1504 | |
1505 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); |
1506 | if (err < 0) { |
1507 | free_page((unsigned long)rxs); |
1508 | goto fail; |
1509 | } |
1510 | info->rx_ring_ref = err; |
1511 | |
1512 | err = xenbus_alloc_evtchn(dev, &info->evtchn); |
1513 | if (err) |
1514 | goto fail; |
1515 | |
1516 | err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, |
1517 | 0, netdev->name, netdev); |
1518 | if (err < 0) |
1519 | goto fail; |
1520 | netdev->irq = err; |
1521 | return 0; |
1522 | |
1523 | fail: |
1524 | return err; |
1525 | } |
1526 | |
1527 | /* Common code used when first setting up, and when resuming. */ |
1528 | static int talk_to_netback(struct xenbus_device *dev, |
1529 | struct netfront_info *info) |
1530 | { |
1531 | const char *message; |
1532 | struct xenbus_transaction xbt; |
1533 | int err; |
1534 | |
1535 | /* Create shared ring, alloc event channel. */ |
1536 | err = setup_netfront(dev, info); |
1537 | if (err) |
1538 | goto out; |
1539 | |
1540 | again: |
1541 | err = xenbus_transaction_start(&xbt); |
1542 | if (err) { |
1543 | xenbus_dev_fatal(dev, err, "starting transaction"); |
1544 | goto destroy_ring; |
1545 | } |
1546 | |
1547 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", |
1548 | info->tx_ring_ref); |
1549 | if (err) { |
1550 | message = "writing tx ring-ref"; |
1551 | goto abort_transaction; |
1552 | } |
1553 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", |
1554 | info->rx_ring_ref); |
1555 | if (err) { |
1556 | message = "writing rx ring-ref"; |
1557 | goto abort_transaction; |
1558 | } |
1559 | err = xenbus_printf(xbt, dev->nodename, |
1560 | "event-channel", "%u", info->evtchn); |
1561 | if (err) { |
1562 | message = "writing event-channel"; |
1563 | goto abort_transaction; |
1564 | } |
1565 | |
1566 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", |
1567 | 1); |
1568 | if (err) { |
1569 | message = "writing request-rx-copy"; |
1570 | goto abort_transaction; |
1571 | } |
1572 | |
1573 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); |
1574 | if (err) { |
1575 | message = "writing feature-rx-notify"; |
1576 | goto abort_transaction; |
1577 | } |
1578 | |
1579 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); |
1580 | if (err) { |
1581 | message = "writing feature-sg"; |
1582 | goto abort_transaction; |
1583 | } |
1584 | |
1585 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); |
1586 | if (err) { |
1587 | message = "writing feature-gso-tcpv4"; |
1588 | goto abort_transaction; |
1589 | } |
1590 | |
1591 | err = xenbus_transaction_end(xbt, 0); |
1592 | if (err) { |
1593 | if (err == -EAGAIN) |
1594 | goto again; |
1595 | xenbus_dev_fatal(dev, err, "completing transaction"); |
1596 | goto destroy_ring; |
1597 | } |
1598 | |
1599 | return 0; |
1600 | |
1601 | abort_transaction: |
1602 | xenbus_transaction_end(xbt, 1); |
1603 | xenbus_dev_fatal(dev, err, "%s", message); |
1604 | destroy_ring: |
1605 | xennet_disconnect_backend(info); |
1606 | out: |
1607 | return err; |
1608 | } |
1609 | |
1610 | static int xennet_connect(struct net_device *dev) |
1611 | { |
1612 | struct netfront_info *np = netdev_priv(dev); |
1613 | int i, requeue_idx, err; |
1614 | struct sk_buff *skb; |
1615 | grant_ref_t ref; |
1616 | struct xen_netif_rx_request *req; |
1617 | unsigned int feature_rx_copy; |
1618 | |
1619 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, |
1620 | "feature-rx-copy", "%u", &feature_rx_copy); |
1621 | if (err != 1) |
1622 | feature_rx_copy = 0; |
1623 | |
1624 | if (!feature_rx_copy) { |
1625 | dev_info(&dev->dev, |
1626 | "backend does not support copying receive path\n"); |
1627 | return -ENODEV; |
1628 | } |
1629 | |
1630 | err = talk_to_netback(np->xbdev, np); |
1631 | if (err) |
1632 | return err; |
1633 | |
1634 | rtnl_lock(); |
1635 | netdev_update_features(dev); |
1636 | rtnl_unlock(); |
1637 | |
1638 | spin_lock_bh(&np->rx_lock); |
1639 | spin_lock_irq(&np->tx_lock); |
1640 | |
1641 | /* Step 1: Discard all pending TX packet fragments. */ |
1642 | xennet_release_tx_bufs(np); |
1643 | |
1644 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ |
1645 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { |
1646 | skb_frag_t *frag; |
1647 | const struct page *page; |
1648 | if (!np->rx_skbs[i]) |
1649 | continue; |
1650 | |
1651 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); |
1652 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); |
1653 | req = RING_GET_REQUEST(&np->rx, requeue_idx); |
1654 | |
1655 | frag = &skb_shinfo(skb)->frags[0]; |
1656 | page = skb_frag_page(frag); |
1657 | gnttab_grant_foreign_access_ref( |
1658 | ref, np->xbdev->otherend_id, |
1659 | pfn_to_mfn(page_to_pfn(page)), |
1660 | 0); |
1661 | req->gref = ref; |
1662 | req->id = requeue_idx; |
1663 | |
1664 | requeue_idx++; |
1665 | } |
1666 | |
1667 | np->rx.req_prod_pvt = requeue_idx; |
1668 | |
1669 | /* |
1670 | * Step 3: All public and private state should now be sane. Get |
1671 | * ready to start sending and receiving packets and give the driver |
1672 | * domain a kick because we've probably just requeued some |
1673 | * packets. |
1674 | */ |
1675 | netif_carrier_on(np->netdev); |
1676 | notify_remote_via_irq(np->netdev->irq); |
1677 | xennet_tx_buf_gc(dev); |
1678 | xennet_alloc_rx_buffers(dev); |
1679 | |
1680 | spin_unlock_irq(&np->tx_lock); |
1681 | spin_unlock_bh(&np->rx_lock); |
1682 | |
1683 | return 0; |
1684 | } |
1685 | |
1686 | /** |
1687 | * Callback received when the backend's state changes. |
1688 | */ |
1689 | static void netback_changed(struct xenbus_device *dev, |
1690 | enum xenbus_state backend_state) |
1691 | { |
1692 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
1693 | struct net_device *netdev = np->netdev; |
1694 | |
1695 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); |
1696 | |
1697 | switch (backend_state) { |
1698 | case XenbusStateInitialising: |
1699 | case XenbusStateInitialised: |
1700 | case XenbusStateReconfiguring: |
1701 | case XenbusStateReconfigured: |
1702 | case XenbusStateUnknown: |
1703 | case XenbusStateClosed: |
1704 | break; |
1705 | |
1706 | case XenbusStateInitWait: |
1707 | if (dev->state != XenbusStateInitialising) |
1708 | break; |
1709 | if (xennet_connect(netdev) != 0) |
1710 | break; |
1711 | xenbus_switch_state(dev, XenbusStateConnected); |
1712 | break; |
1713 | |
1714 | case XenbusStateConnected: |
1715 | netif_notify_peers(netdev); |
1716 | break; |
1717 | |
1718 | case XenbusStateClosing: |
1719 | xenbus_frontend_closed(dev); |
1720 | break; |
1721 | } |
1722 | } |
1723 | |
1724 | static const struct xennet_stat { |
1725 | char name[ETH_GSTRING_LEN]; |
1726 | u16 offset; |
1727 | } xennet_stats[] = { |
1728 | { |
1729 | "rx_gso_checksum_fixup", |
1730 | offsetof(struct netfront_info, rx_gso_checksum_fixup) |
1731 | }, |
1732 | }; |
1733 | |
1734 | static int xennet_get_sset_count(struct net_device *dev, int string_set) |
1735 | { |
1736 | switch (string_set) { |
1737 | case ETH_SS_STATS: |
1738 | return ARRAY_SIZE(xennet_stats); |
1739 | default: |
1740 | return -EINVAL; |
1741 | } |
1742 | } |
1743 | |
1744 | static void xennet_get_ethtool_stats(struct net_device *dev, |
1745 | struct ethtool_stats *stats, u64 * data) |
1746 | { |
1747 | void *np = netdev_priv(dev); |
1748 | int i; |
1749 | |
1750 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
1751 | data[i] = *(unsigned long *)(np + xennet_stats[i].offset); |
1752 | } |
1753 | |
1754 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) |
1755 | { |
1756 | int i; |
1757 | |
1758 | switch (stringset) { |
1759 | case ETH_SS_STATS: |
1760 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
1761 | memcpy(data + i * ETH_GSTRING_LEN, |
1762 | xennet_stats[i].name, ETH_GSTRING_LEN); |
1763 | break; |
1764 | } |
1765 | } |
1766 | |
1767 | static const struct ethtool_ops xennet_ethtool_ops = |
1768 | { |
1769 | .get_link = ethtool_op_get_link, |
1770 | |
1771 | .get_sset_count = xennet_get_sset_count, |
1772 | .get_ethtool_stats = xennet_get_ethtool_stats, |
1773 | .get_strings = xennet_get_strings, |
1774 | }; |
1775 | |
1776 | #ifdef CONFIG_SYSFS |
1777 | static ssize_t show_rxbuf_min(struct device *dev, |
1778 | struct device_attribute *attr, char *buf) |
1779 | { |
1780 | struct net_device *netdev = to_net_dev(dev); |
1781 | struct netfront_info *info = netdev_priv(netdev); |
1782 | |
1783 | return sprintf(buf, "%u\n", info->rx_min_target); |
1784 | } |
1785 | |
1786 | static ssize_t store_rxbuf_min(struct device *dev, |
1787 | struct device_attribute *attr, |
1788 | const char *buf, size_t len) |
1789 | { |
1790 | struct net_device *netdev = to_net_dev(dev); |
1791 | struct netfront_info *np = netdev_priv(netdev); |
1792 | char *endp; |
1793 | unsigned long target; |
1794 | |
1795 | if (!capable(CAP_NET_ADMIN)) |
1796 | return -EPERM; |
1797 | |
1798 | target = simple_strtoul(buf, &endp, 0); |
1799 | if (endp == buf) |
1800 | return -EBADMSG; |
1801 | |
1802 | if (target < RX_MIN_TARGET) |
1803 | target = RX_MIN_TARGET; |
1804 | if (target > RX_MAX_TARGET) |
1805 | target = RX_MAX_TARGET; |
1806 | |
1807 | spin_lock_bh(&np->rx_lock); |
1808 | if (target > np->rx_max_target) |
1809 | np->rx_max_target = target; |
1810 | np->rx_min_target = target; |
1811 | if (target > np->rx_target) |
1812 | np->rx_target = target; |
1813 | |
1814 | xennet_alloc_rx_buffers(netdev); |
1815 | |
1816 | spin_unlock_bh(&np->rx_lock); |
1817 | return len; |
1818 | } |
1819 | |
1820 | static ssize_t show_rxbuf_max(struct device *dev, |
1821 | struct device_attribute *attr, char *buf) |
1822 | { |
1823 | struct net_device *netdev = to_net_dev(dev); |
1824 | struct netfront_info *info = netdev_priv(netdev); |
1825 | |
1826 | return sprintf(buf, "%u\n", info->rx_max_target); |
1827 | } |
1828 | |
1829 | static ssize_t store_rxbuf_max(struct device *dev, |
1830 | struct device_attribute *attr, |
1831 | const char *buf, size_t len) |
1832 | { |
1833 | struct net_device *netdev = to_net_dev(dev); |
1834 | struct netfront_info *np = netdev_priv(netdev); |
1835 | char *endp; |
1836 | unsigned long target; |
1837 | |
1838 | if (!capable(CAP_NET_ADMIN)) |
1839 | return -EPERM; |
1840 | |
1841 | target = simple_strtoul(buf, &endp, 0); |
1842 | if (endp == buf) |
1843 | return -EBADMSG; |
1844 | |
1845 | if (target < RX_MIN_TARGET) |
1846 | target = RX_MIN_TARGET; |
1847 | if (target > RX_MAX_TARGET) |
1848 | target = RX_MAX_TARGET; |
1849 | |
1850 | spin_lock_bh(&np->rx_lock); |
1851 | if (target < np->rx_min_target) |
1852 | np->rx_min_target = target; |
1853 | np->rx_max_target = target; |
1854 | if (target < np->rx_target) |
1855 | np->rx_target = target; |
1856 | |
1857 | xennet_alloc_rx_buffers(netdev); |
1858 | |
1859 | spin_unlock_bh(&np->rx_lock); |
1860 | return len; |
1861 | } |
1862 | |
1863 | static ssize_t show_rxbuf_cur(struct device *dev, |
1864 | struct device_attribute *attr, char *buf) |
1865 | { |
1866 | struct net_device *netdev = to_net_dev(dev); |
1867 | struct netfront_info *info = netdev_priv(netdev); |
1868 | |
1869 | return sprintf(buf, "%u\n", info->rx_target); |
1870 | } |
1871 | |
1872 | static struct device_attribute xennet_attrs[] = { |
1873 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), |
1874 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), |
1875 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), |
1876 | }; |
1877 | |
1878 | static int xennet_sysfs_addif(struct net_device *netdev) |
1879 | { |
1880 | int i; |
1881 | int err; |
1882 | |
1883 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { |
1884 | err = device_create_file(&netdev->dev, |
1885 | &xennet_attrs[i]); |
1886 | if (err) |
1887 | goto fail; |
1888 | } |
1889 | return 0; |
1890 | |
1891 | fail: |
1892 | while (--i >= 0) |
1893 | device_remove_file(&netdev->dev, &xennet_attrs[i]); |
1894 | return err; |
1895 | } |
1896 | |
1897 | static void xennet_sysfs_delif(struct net_device *netdev) |
1898 | { |
1899 | int i; |
1900 | |
1901 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) |
1902 | device_remove_file(&netdev->dev, &xennet_attrs[i]); |
1903 | } |
1904 | |
1905 | #endif /* CONFIG_SYSFS */ |
1906 | |
1907 | static const struct xenbus_device_id netfront_ids[] = { |
1908 | { "vif" }, |
1909 | { "" } |
1910 | }; |
1911 | |
1912 | |
1913 | static int __devexit xennet_remove(struct xenbus_device *dev) |
1914 | { |
1915 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
1916 | |
1917 | dev_dbg(&dev->dev, "%s\n", dev->nodename); |
1918 | |
1919 | xennet_disconnect_backend(info); |
1920 | |
1921 | xennet_sysfs_delif(info->netdev); |
1922 | |
1923 | unregister_netdev(info->netdev); |
1924 | |
1925 | del_timer_sync(&info->rx_refill_timer); |
1926 | |
1927 | free_percpu(info->stats); |
1928 | |
1929 | free_netdev(info->netdev); |
1930 | |
1931 | return 0; |
1932 | } |
1933 | |
1934 | static DEFINE_XENBUS_DRIVER(netfront, , |
1935 | .probe = netfront_probe, |
1936 | .remove = __devexit_p(xennet_remove), |
1937 | .resume = netfront_resume, |
1938 | .otherend_changed = netback_changed, |
1939 | ); |
1940 | |
1941 | static int __init netif_init(void) |
1942 | { |
1943 | if (!xen_domain()) |
1944 | return -ENODEV; |
1945 | |
1946 | if (xen_hvm_domain() && !xen_platform_pci_unplug) |
1947 | return -ENODEV; |
1948 | |
1949 | printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); |
1950 | |
1951 | return xenbus_register_frontend(&netfront_driver); |
1952 | } |
1953 | module_init(netif_init); |
1954 | |
1955 | |
1956 | static void __exit netif_exit(void) |
1957 | { |
1958 | xenbus_unregister_driver(&netfront_driver); |
1959 | } |
1960 | module_exit(netif_exit); |
1961 | |
1962 | MODULE_DESCRIPTION("Xen virtual network device frontend"); |
1963 | MODULE_LICENSE("GPL"); |
1964 | MODULE_ALIAS("xen:vif"); |
1965 | MODULE_ALIAS("xennet"); |
1966 |
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