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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 | ||
bea3348e | 75 | struct napi_struct napi; |
0d160211 | 76 | |
0d160211 | 77 | unsigned int evtchn; |
84284d3c | 78 | struct xenbus_device *xbdev; |
0d160211 | 79 | |
84284d3c JF |
80 | spinlock_t tx_lock; |
81 | struct xen_netif_tx_front_ring tx; | |
82 | int tx_ring_ref; | |
0d160211 JF |
83 | |
84 | /* | |
85 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries | |
86 | * are linked from tx_skb_freelist through skb_entry.link. | |
87 | * | |
88 | * NB. Freelist index entries are always going to be less than | |
89 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or | |
90 | * greater than PAGE_OFFSET: we use this property to distinguish | |
91 | * them. | |
92 | */ | |
93 | union skb_entry { | |
94 | struct sk_buff *skb; | |
1ffb40b8 | 95 | unsigned long link; |
0d160211 JF |
96 | } tx_skbs[NET_TX_RING_SIZE]; |
97 | grant_ref_t gref_tx_head; | |
98 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | |
99 | unsigned tx_skb_freelist; | |
100 | ||
84284d3c JF |
101 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
102 | struct xen_netif_rx_front_ring rx; | |
103 | int rx_ring_ref; | |
104 | ||
105 | /* Receive-ring batched refills. */ | |
106 | #define RX_MIN_TARGET 8 | |
107 | #define RX_DFL_MIN_TARGET 64 | |
108 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | |
109 | unsigned rx_min_target, rx_max_target, rx_target; | |
110 | struct sk_buff_head rx_batch; | |
111 | ||
112 | struct timer_list rx_refill_timer; | |
113 | ||
0d160211 JF |
114 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
115 | grant_ref_t gref_rx_head; | |
116 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; | |
117 | ||
0d160211 JF |
118 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; |
119 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; | |
120 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; | |
121 | }; | |
122 | ||
123 | struct netfront_rx_info { | |
124 | struct xen_netif_rx_response rx; | |
125 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; | |
126 | }; | |
127 | ||
1ffb40b8 IY |
128 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
129 | { | |
130 | list->link = id; | |
131 | } | |
132 | ||
133 | static int skb_entry_is_link(const union skb_entry *list) | |
134 | { | |
135 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); | |
136 | return ((unsigned long)list->skb < PAGE_OFFSET); | |
137 | } | |
138 | ||
0d160211 JF |
139 | /* |
140 | * Access macros for acquiring freeing slots in tx_skbs[]. | |
141 | */ | |
142 | ||
143 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, | |
144 | unsigned short id) | |
145 | { | |
1ffb40b8 | 146 | skb_entry_set_link(&list[id], *head); |
0d160211 JF |
147 | *head = id; |
148 | } | |
149 | ||
150 | static unsigned short get_id_from_freelist(unsigned *head, | |
151 | union skb_entry *list) | |
152 | { | |
153 | unsigned int id = *head; | |
154 | *head = list[id].link; | |
155 | return id; | |
156 | } | |
157 | ||
158 | static int xennet_rxidx(RING_IDX idx) | |
159 | { | |
160 | return idx & (NET_RX_RING_SIZE - 1); | |
161 | } | |
162 | ||
163 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, | |
164 | RING_IDX ri) | |
165 | { | |
166 | int i = xennet_rxidx(ri); | |
167 | struct sk_buff *skb = np->rx_skbs[i]; | |
168 | np->rx_skbs[i] = NULL; | |
169 | return skb; | |
170 | } | |
171 | ||
172 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, | |
173 | RING_IDX ri) | |
174 | { | |
175 | int i = xennet_rxidx(ri); | |
176 | grant_ref_t ref = np->grant_rx_ref[i]; | |
177 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
178 | return ref; | |
179 | } | |
180 | ||
181 | #ifdef CONFIG_SYSFS | |
182 | static int xennet_sysfs_addif(struct net_device *netdev); | |
183 | static void xennet_sysfs_delif(struct net_device *netdev); | |
184 | #else /* !CONFIG_SYSFS */ | |
185 | #define xennet_sysfs_addif(dev) (0) | |
186 | #define xennet_sysfs_delif(dev) do { } while (0) | |
187 | #endif | |
188 | ||
189 | static int xennet_can_sg(struct net_device *dev) | |
190 | { | |
191 | return dev->features & NETIF_F_SG; | |
192 | } | |
193 | ||
194 | ||
195 | static void rx_refill_timeout(unsigned long data) | |
196 | { | |
197 | struct net_device *dev = (struct net_device *)data; | |
bea3348e SH |
198 | struct netfront_info *np = netdev_priv(dev); |
199 | netif_rx_schedule(dev, &np->napi); | |
0d160211 JF |
200 | } |
201 | ||
202 | static int netfront_tx_slot_available(struct netfront_info *np) | |
203 | { | |
204 | return ((np->tx.req_prod_pvt - np->tx.rsp_cons) < | |
205 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2)); | |
206 | } | |
207 | ||
208 | static void xennet_maybe_wake_tx(struct net_device *dev) | |
209 | { | |
210 | struct netfront_info *np = netdev_priv(dev); | |
211 | ||
212 | if (unlikely(netif_queue_stopped(dev)) && | |
213 | netfront_tx_slot_available(np) && | |
214 | likely(netif_running(dev))) | |
215 | netif_wake_queue(dev); | |
216 | } | |
217 | ||
218 | static void xennet_alloc_rx_buffers(struct net_device *dev) | |
219 | { | |
220 | unsigned short id; | |
221 | struct netfront_info *np = netdev_priv(dev); | |
222 | struct sk_buff *skb; | |
223 | struct page *page; | |
224 | int i, batch_target, notify; | |
225 | RING_IDX req_prod = np->rx.req_prod_pvt; | |
0d160211 JF |
226 | grant_ref_t ref; |
227 | unsigned long pfn; | |
228 | void *vaddr; | |
0d160211 JF |
229 | struct xen_netif_rx_request *req; |
230 | ||
231 | if (unlikely(!netif_carrier_ok(dev))) | |
232 | return; | |
233 | ||
234 | /* | |
235 | * Allocate skbuffs greedily, even though we batch updates to the | |
236 | * receive ring. This creates a less bursty demand on the memory | |
237 | * allocator, so should reduce the chance of failed allocation requests | |
238 | * both for ourself and for other kernel subsystems. | |
239 | */ | |
240 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); | |
241 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { | |
617a20bb | 242 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, |
0d160211 JF |
243 | GFP_ATOMIC | __GFP_NOWARN); |
244 | if (unlikely(!skb)) | |
245 | goto no_skb; | |
246 | ||
617a20bb IY |
247 | /* Align ip header to a 16 bytes boundary */ |
248 | skb_reserve(skb, NET_IP_ALIGN); | |
249 | ||
0d160211 JF |
250 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
251 | if (!page) { | |
252 | kfree_skb(skb); | |
253 | no_skb: | |
254 | /* Any skbuffs queued for refill? Force them out. */ | |
255 | if (i != 0) | |
256 | goto refill; | |
257 | /* Could not allocate any skbuffs. Try again later. */ | |
258 | mod_timer(&np->rx_refill_timer, | |
259 | jiffies + (HZ/10)); | |
260 | break; | |
261 | } | |
262 | ||
263 | skb_shinfo(skb)->frags[0].page = page; | |
264 | skb_shinfo(skb)->nr_frags = 1; | |
265 | __skb_queue_tail(&np->rx_batch, skb); | |
266 | } | |
267 | ||
268 | /* Is the batch large enough to be worthwhile? */ | |
269 | if (i < (np->rx_target/2)) { | |
270 | if (req_prod > np->rx.sring->req_prod) | |
271 | goto push; | |
272 | return; | |
273 | } | |
274 | ||
275 | /* Adjust our fill target if we risked running out of buffers. */ | |
276 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && | |
277 | ((np->rx_target *= 2) > np->rx_max_target)) | |
278 | np->rx_target = np->rx_max_target; | |
279 | ||
280 | refill: | |
5dcddfae | 281 | for (i = 0; ; i++) { |
0d160211 JF |
282 | skb = __skb_dequeue(&np->rx_batch); |
283 | if (skb == NULL) | |
284 | break; | |
285 | ||
286 | skb->dev = dev; | |
287 | ||
288 | id = xennet_rxidx(req_prod + i); | |
289 | ||
290 | BUG_ON(np->rx_skbs[id]); | |
291 | np->rx_skbs[id] = skb; | |
292 | ||
293 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); | |
294 | BUG_ON((signed short)ref < 0); | |
295 | np->grant_rx_ref[id] = ref; | |
296 | ||
297 | pfn = page_to_pfn(skb_shinfo(skb)->frags[0].page); | |
298 | vaddr = page_address(skb_shinfo(skb)->frags[0].page); | |
299 | ||
300 | req = RING_GET_REQUEST(&np->rx, req_prod + i); | |
301 | gnttab_grant_foreign_access_ref(ref, | |
302 | np->xbdev->otherend_id, | |
303 | pfn_to_mfn(pfn), | |
304 | 0); | |
305 | ||
306 | req->id = id; | |
307 | req->gref = ref; | |
308 | } | |
309 | ||
5dcddfae | 310 | wmb(); /* barrier so backend seens requests */ |
0d160211 JF |
311 | |
312 | /* Above is a suitable barrier to ensure backend will see requests. */ | |
313 | np->rx.req_prod_pvt = req_prod + i; | |
314 | push: | |
315 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); | |
316 | if (notify) | |
317 | notify_remote_via_irq(np->netdev->irq); | |
318 | } | |
319 | ||
320 | static int xennet_open(struct net_device *dev) | |
321 | { | |
322 | struct netfront_info *np = netdev_priv(dev); | |
323 | ||
bea3348e SH |
324 | napi_enable(&np->napi); |
325 | ||
0d160211 JF |
326 | spin_lock_bh(&np->rx_lock); |
327 | if (netif_carrier_ok(dev)) { | |
328 | xennet_alloc_rx_buffers(dev); | |
329 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; | |
330 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
bea3348e | 331 | netif_rx_schedule(dev, &np->napi); |
0d160211 JF |
332 | } |
333 | spin_unlock_bh(&np->rx_lock); | |
334 | ||
0b1ab1b8 | 335 | netif_start_queue(dev); |
0d160211 JF |
336 | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static void xennet_tx_buf_gc(struct net_device *dev) | |
341 | { | |
342 | RING_IDX cons, prod; | |
343 | unsigned short id; | |
344 | struct netfront_info *np = netdev_priv(dev); | |
345 | struct sk_buff *skb; | |
346 | ||
347 | BUG_ON(!netif_carrier_ok(dev)); | |
348 | ||
349 | do { | |
350 | prod = np->tx.sring->rsp_prod; | |
351 | rmb(); /* Ensure we see responses up to 'rp'. */ | |
352 | ||
353 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { | |
354 | struct xen_netif_tx_response *txrsp; | |
355 | ||
356 | txrsp = RING_GET_RESPONSE(&np->tx, cons); | |
357 | if (txrsp->status == NETIF_RSP_NULL) | |
358 | continue; | |
359 | ||
360 | id = txrsp->id; | |
361 | skb = np->tx_skbs[id].skb; | |
362 | if (unlikely(gnttab_query_foreign_access( | |
363 | np->grant_tx_ref[id]) != 0)) { | |
364 | printk(KERN_ALERT "xennet_tx_buf_gc: warning " | |
365 | "-- grant still in use by backend " | |
366 | "domain.\n"); | |
367 | BUG(); | |
368 | } | |
369 | gnttab_end_foreign_access_ref( | |
370 | np->grant_tx_ref[id], GNTMAP_readonly); | |
371 | gnttab_release_grant_reference( | |
372 | &np->gref_tx_head, np->grant_tx_ref[id]); | |
373 | np->grant_tx_ref[id] = GRANT_INVALID_REF; | |
374 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); | |
375 | dev_kfree_skb_irq(skb); | |
376 | } | |
377 | ||
378 | np->tx.rsp_cons = prod; | |
379 | ||
380 | /* | |
381 | * Set a new event, then check for race with update of tx_cons. | |
382 | * Note that it is essential to schedule a callback, no matter | |
383 | * how few buffers are pending. Even if there is space in the | |
384 | * transmit ring, higher layers may be blocked because too much | |
385 | * data is outstanding: in such cases notification from Xen is | |
386 | * likely to be the only kick that we'll get. | |
387 | */ | |
388 | np->tx.sring->rsp_event = | |
389 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; | |
390 | mb(); /* update shared area */ | |
391 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); | |
392 | ||
393 | xennet_maybe_wake_tx(dev); | |
394 | } | |
395 | ||
396 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, | |
397 | struct xen_netif_tx_request *tx) | |
398 | { | |
399 | struct netfront_info *np = netdev_priv(dev); | |
400 | char *data = skb->data; | |
401 | unsigned long mfn; | |
402 | RING_IDX prod = np->tx.req_prod_pvt; | |
403 | int frags = skb_shinfo(skb)->nr_frags; | |
404 | unsigned int offset = offset_in_page(data); | |
405 | unsigned int len = skb_headlen(skb); | |
406 | unsigned int id; | |
407 | grant_ref_t ref; | |
408 | int i; | |
409 | ||
410 | /* While the header overlaps a page boundary (including being | |
411 | larger than a page), split it it into page-sized chunks. */ | |
412 | while (len > PAGE_SIZE - offset) { | |
413 | tx->size = PAGE_SIZE - offset; | |
414 | tx->flags |= NETTXF_more_data; | |
415 | len -= tx->size; | |
416 | data += tx->size; | |
417 | offset = 0; | |
418 | ||
419 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
420 | np->tx_skbs[id].skb = skb_get(skb); | |
421 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
422 | tx->id = id; | |
423 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
424 | BUG_ON((signed short)ref < 0); | |
425 | ||
426 | mfn = virt_to_mfn(data); | |
427 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
428 | mfn, GNTMAP_readonly); | |
429 | ||
430 | tx->gref = np->grant_tx_ref[id] = ref; | |
431 | tx->offset = offset; | |
432 | tx->size = len; | |
433 | tx->flags = 0; | |
434 | } | |
435 | ||
436 | /* Grant backend access to each skb fragment page. */ | |
437 | for (i = 0; i < frags; i++) { | |
438 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
439 | ||
440 | tx->flags |= NETTXF_more_data; | |
441 | ||
442 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
443 | np->tx_skbs[id].skb = skb_get(skb); | |
444 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
445 | tx->id = id; | |
446 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
447 | BUG_ON((signed short)ref < 0); | |
448 | ||
449 | mfn = pfn_to_mfn(page_to_pfn(frag->page)); | |
450 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
451 | mfn, GNTMAP_readonly); | |
452 | ||
453 | tx->gref = np->grant_tx_ref[id] = ref; | |
454 | tx->offset = frag->page_offset; | |
455 | tx->size = frag->size; | |
456 | tx->flags = 0; | |
457 | } | |
458 | ||
459 | np->tx.req_prod_pvt = prod; | |
460 | } | |
461 | ||
462 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
463 | { | |
464 | unsigned short id; | |
465 | struct netfront_info *np = netdev_priv(dev); | |
466 | struct xen_netif_tx_request *tx; | |
467 | struct xen_netif_extra_info *extra; | |
468 | char *data = skb->data; | |
469 | RING_IDX i; | |
470 | grant_ref_t ref; | |
471 | unsigned long mfn; | |
472 | int notify; | |
473 | int frags = skb_shinfo(skb)->nr_frags; | |
474 | unsigned int offset = offset_in_page(data); | |
475 | unsigned int len = skb_headlen(skb); | |
476 | ||
43526370 | 477 | frags += DIV_ROUND_UP(offset + len, PAGE_SIZE); |
0d160211 JF |
478 | if (unlikely(frags > MAX_SKB_FRAGS + 1)) { |
479 | printk(KERN_ALERT "xennet: skb rides the rocket: %d frags\n", | |
480 | frags); | |
481 | dump_stack(); | |
482 | goto drop; | |
483 | } | |
484 | ||
485 | spin_lock_irq(&np->tx_lock); | |
486 | ||
487 | if (unlikely(!netif_carrier_ok(dev) || | |
488 | (frags > 1 && !xennet_can_sg(dev)) || | |
489 | netif_needs_gso(dev, skb))) { | |
490 | spin_unlock_irq(&np->tx_lock); | |
491 | goto drop; | |
492 | } | |
493 | ||
494 | i = np->tx.req_prod_pvt; | |
495 | ||
496 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
497 | np->tx_skbs[id].skb = skb; | |
498 | ||
499 | tx = RING_GET_REQUEST(&np->tx, i); | |
500 | ||
501 | tx->id = id; | |
502 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
503 | BUG_ON((signed short)ref < 0); | |
504 | mfn = virt_to_mfn(data); | |
505 | gnttab_grant_foreign_access_ref( | |
506 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | |
507 | tx->gref = np->grant_tx_ref[id] = ref; | |
508 | tx->offset = offset; | |
509 | tx->size = len; | |
510 | extra = NULL; | |
511 | ||
512 | tx->flags = 0; | |
513 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
514 | /* local packet? */ | |
515 | tx->flags |= NETTXF_csum_blank | NETTXF_data_validated; | |
516 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) | |
517 | /* remote but checksummed. */ | |
518 | tx->flags |= NETTXF_data_validated; | |
519 | ||
520 | if (skb_shinfo(skb)->gso_size) { | |
521 | struct xen_netif_extra_info *gso; | |
522 | ||
523 | gso = (struct xen_netif_extra_info *) | |
524 | RING_GET_REQUEST(&np->tx, ++i); | |
525 | ||
526 | if (extra) | |
527 | extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; | |
528 | else | |
529 | tx->flags |= NETTXF_extra_info; | |
530 | ||
531 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
532 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; | |
533 | gso->u.gso.pad = 0; | |
534 | gso->u.gso.features = 0; | |
535 | ||
536 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
537 | gso->flags = 0; | |
538 | extra = gso; | |
539 | } | |
540 | ||
541 | np->tx.req_prod_pvt = i + 1; | |
542 | ||
543 | xennet_make_frags(skb, dev, tx); | |
544 | tx->size = skb->len; | |
545 | ||
546 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | |
547 | if (notify) | |
548 | notify_remote_via_irq(np->netdev->irq); | |
549 | ||
09f75cd7 JG |
550 | dev->stats.tx_bytes += skb->len; |
551 | dev->stats.tx_packets++; | |
10a273a6 JF |
552 | |
553 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
0d160211 JF |
554 | xennet_tx_buf_gc(dev); |
555 | ||
556 | if (!netfront_tx_slot_available(np)) | |
557 | netif_stop_queue(dev); | |
558 | ||
559 | spin_unlock_irq(&np->tx_lock); | |
560 | ||
0d160211 JF |
561 | return 0; |
562 | ||
563 | drop: | |
09f75cd7 | 564 | dev->stats.tx_dropped++; |
0d160211 JF |
565 | dev_kfree_skb(skb); |
566 | return 0; | |
567 | } | |
568 | ||
569 | static int xennet_close(struct net_device *dev) | |
570 | { | |
571 | struct netfront_info *np = netdev_priv(dev); | |
572 | netif_stop_queue(np->netdev); | |
bea3348e | 573 | napi_disable(&np->napi); |
0d160211 JF |
574 | return 0; |
575 | } | |
576 | ||
0d160211 JF |
577 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
578 | grant_ref_t ref) | |
579 | { | |
580 | int new = xennet_rxidx(np->rx.req_prod_pvt); | |
581 | ||
582 | BUG_ON(np->rx_skbs[new]); | |
583 | np->rx_skbs[new] = skb; | |
584 | np->grant_rx_ref[new] = ref; | |
585 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | |
586 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | |
587 | np->rx.req_prod_pvt++; | |
588 | } | |
589 | ||
590 | static int xennet_get_extras(struct netfront_info *np, | |
591 | struct xen_netif_extra_info *extras, | |
592 | RING_IDX rp) | |
593 | ||
594 | { | |
595 | struct xen_netif_extra_info *extra; | |
596 | struct device *dev = &np->netdev->dev; | |
597 | RING_IDX cons = np->rx.rsp_cons; | |
598 | int err = 0; | |
599 | ||
600 | do { | |
601 | struct sk_buff *skb; | |
602 | grant_ref_t ref; | |
603 | ||
604 | if (unlikely(cons + 1 == rp)) { | |
605 | if (net_ratelimit()) | |
606 | dev_warn(dev, "Missing extra info\n"); | |
607 | err = -EBADR; | |
608 | break; | |
609 | } | |
610 | ||
611 | extra = (struct xen_netif_extra_info *) | |
612 | RING_GET_RESPONSE(&np->rx, ++cons); | |
613 | ||
614 | if (unlikely(!extra->type || | |
615 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
616 | if (net_ratelimit()) | |
617 | dev_warn(dev, "Invalid extra type: %d\n", | |
618 | extra->type); | |
619 | err = -EINVAL; | |
620 | } else { | |
621 | memcpy(&extras[extra->type - 1], extra, | |
622 | sizeof(*extra)); | |
623 | } | |
624 | ||
625 | skb = xennet_get_rx_skb(np, cons); | |
626 | ref = xennet_get_rx_ref(np, cons); | |
627 | xennet_move_rx_slot(np, skb, ref); | |
628 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | |
629 | ||
630 | np->rx.rsp_cons = cons; | |
631 | return err; | |
632 | } | |
633 | ||
634 | static int xennet_get_responses(struct netfront_info *np, | |
635 | struct netfront_rx_info *rinfo, RING_IDX rp, | |
636 | struct sk_buff_head *list) | |
637 | { | |
638 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
639 | struct xen_netif_extra_info *extras = rinfo->extras; | |
640 | struct device *dev = &np->netdev->dev; | |
641 | RING_IDX cons = np->rx.rsp_cons; | |
642 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | |
643 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | |
644 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | |
645 | int frags = 1; | |
646 | int err = 0; | |
647 | unsigned long ret; | |
648 | ||
649 | if (rx->flags & NETRXF_extra_info) { | |
650 | err = xennet_get_extras(np, extras, rp); | |
651 | cons = np->rx.rsp_cons; | |
652 | } | |
653 | ||
654 | for (;;) { | |
655 | if (unlikely(rx->status < 0 || | |
656 | rx->offset + rx->status > PAGE_SIZE)) { | |
657 | if (net_ratelimit()) | |
658 | dev_warn(dev, "rx->offset: %x, size: %u\n", | |
659 | rx->offset, rx->status); | |
660 | xennet_move_rx_slot(np, skb, ref); | |
661 | err = -EINVAL; | |
662 | goto next; | |
663 | } | |
664 | ||
665 | /* | |
666 | * This definitely indicates a bug, either in this driver or in | |
667 | * the backend driver. In future this should flag the bad | |
668 | * situation to the system controller to reboot the backed. | |
669 | */ | |
670 | if (ref == GRANT_INVALID_REF) { | |
671 | if (net_ratelimit()) | |
672 | dev_warn(dev, "Bad rx response id %d.\n", | |
673 | rx->id); | |
674 | err = -EINVAL; | |
675 | goto next; | |
676 | } | |
677 | ||
678 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
679 | BUG_ON(!ret); | |
680 | ||
681 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
682 | ||
683 | __skb_queue_tail(list, skb); | |
684 | ||
685 | next: | |
686 | if (!(rx->flags & NETRXF_more_data)) | |
687 | break; | |
688 | ||
689 | if (cons + frags == rp) { | |
690 | if (net_ratelimit()) | |
691 | dev_warn(dev, "Need more frags\n"); | |
692 | err = -ENOENT; | |
693 | break; | |
694 | } | |
695 | ||
696 | rx = RING_GET_RESPONSE(&np->rx, cons + frags); | |
697 | skb = xennet_get_rx_skb(np, cons + frags); | |
698 | ref = xennet_get_rx_ref(np, cons + frags); | |
699 | frags++; | |
700 | } | |
701 | ||
702 | if (unlikely(frags > max)) { | |
703 | if (net_ratelimit()) | |
704 | dev_warn(dev, "Too many frags\n"); | |
705 | err = -E2BIG; | |
706 | } | |
707 | ||
708 | if (unlikely(err)) | |
709 | np->rx.rsp_cons = cons + frags; | |
710 | ||
711 | return err; | |
712 | } | |
713 | ||
714 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
715 | struct xen_netif_extra_info *gso) | |
716 | { | |
717 | if (!gso->u.gso.size) { | |
718 | if (net_ratelimit()) | |
719 | printk(KERN_WARNING "GSO size must not be zero.\n"); | |
720 | return -EINVAL; | |
721 | } | |
722 | ||
723 | /* Currently only TCPv4 S.O. is supported. */ | |
724 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { | |
725 | if (net_ratelimit()) | |
726 | printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); | |
727 | return -EINVAL; | |
728 | } | |
729 | ||
730 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
731 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
732 | ||
733 | /* Header must be checked, and gso_segs computed. */ | |
734 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
735 | skb_shinfo(skb)->gso_segs = 0; | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | |
741 | struct sk_buff *skb, | |
742 | struct sk_buff_head *list) | |
743 | { | |
744 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
745 | int nr_frags = shinfo->nr_frags; | |
746 | RING_IDX cons = np->rx.rsp_cons; | |
747 | skb_frag_t *frag = shinfo->frags + nr_frags; | |
748 | struct sk_buff *nskb; | |
749 | ||
750 | while ((nskb = __skb_dequeue(list))) { | |
751 | struct xen_netif_rx_response *rx = | |
752 | RING_GET_RESPONSE(&np->rx, ++cons); | |
753 | ||
754 | frag->page = skb_shinfo(nskb)->frags[0].page; | |
755 | frag->page_offset = rx->offset; | |
756 | frag->size = rx->status; | |
757 | ||
758 | skb->data_len += rx->status; | |
759 | ||
760 | skb_shinfo(nskb)->nr_frags = 0; | |
761 | kfree_skb(nskb); | |
762 | ||
763 | frag++; | |
764 | nr_frags++; | |
765 | } | |
766 | ||
767 | shinfo->nr_frags = nr_frags; | |
768 | return cons; | |
769 | } | |
770 | ||
771 | static int skb_checksum_setup(struct sk_buff *skb) | |
772 | { | |
773 | struct iphdr *iph; | |
774 | unsigned char *th; | |
775 | int err = -EPROTO; | |
776 | ||
777 | if (skb->protocol != htons(ETH_P_IP)) | |
778 | goto out; | |
779 | ||
780 | iph = (void *)skb->data; | |
781 | th = skb->data + 4 * iph->ihl; | |
782 | if (th >= skb_tail_pointer(skb)) | |
783 | goto out; | |
784 | ||
785 | skb->csum_start = th - skb->head; | |
786 | switch (iph->protocol) { | |
787 | case IPPROTO_TCP: | |
788 | skb->csum_offset = offsetof(struct tcphdr, check); | |
789 | break; | |
790 | case IPPROTO_UDP: | |
791 | skb->csum_offset = offsetof(struct udphdr, check); | |
792 | break; | |
793 | default: | |
794 | if (net_ratelimit()) | |
795 | printk(KERN_ERR "Attempting to checksum a non-" | |
796 | "TCP/UDP packet, dropping a protocol" | |
797 | " %d packet", iph->protocol); | |
798 | goto out; | |
799 | } | |
800 | ||
801 | if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) | |
802 | goto out; | |
803 | ||
804 | err = 0; | |
805 | ||
806 | out: | |
807 | return err; | |
808 | } | |
809 | ||
810 | static int handle_incoming_queue(struct net_device *dev, | |
09f75cd7 | 811 | struct sk_buff_head *rxq) |
0d160211 | 812 | { |
0d160211 JF |
813 | int packets_dropped = 0; |
814 | struct sk_buff *skb; | |
815 | ||
816 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
817 | struct page *page = NETFRONT_SKB_CB(skb)->page; | |
818 | void *vaddr = page_address(page); | |
819 | unsigned offset = NETFRONT_SKB_CB(skb)->offset; | |
820 | ||
821 | memcpy(skb->data, vaddr + offset, | |
822 | skb_headlen(skb)); | |
823 | ||
824 | if (page != skb_shinfo(skb)->frags[0].page) | |
825 | __free_page(page); | |
826 | ||
827 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
828 | skb->protocol = eth_type_trans(skb, dev); | |
829 | ||
830 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
831 | if (skb_checksum_setup(skb)) { | |
832 | kfree_skb(skb); | |
833 | packets_dropped++; | |
09f75cd7 | 834 | dev->stats.rx_errors++; |
0d160211 JF |
835 | continue; |
836 | } | |
837 | } | |
838 | ||
09f75cd7 JG |
839 | dev->stats.rx_packets++; |
840 | dev->stats.rx_bytes += skb->len; | |
0d160211 JF |
841 | |
842 | /* Pass it up. */ | |
843 | netif_receive_skb(skb); | |
844 | dev->last_rx = jiffies; | |
845 | } | |
846 | ||
847 | return packets_dropped; | |
848 | } | |
849 | ||
bea3348e | 850 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 851 | { |
bea3348e SH |
852 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
853 | struct net_device *dev = np->netdev; | |
0d160211 JF |
854 | struct sk_buff *skb; |
855 | struct netfront_rx_info rinfo; | |
856 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
857 | struct xen_netif_extra_info *extras = rinfo.extras; | |
858 | RING_IDX i, rp; | |
bea3348e | 859 | int work_done; |
0d160211 JF |
860 | struct sk_buff_head rxq; |
861 | struct sk_buff_head errq; | |
862 | struct sk_buff_head tmpq; | |
863 | unsigned long flags; | |
864 | unsigned int len; | |
865 | int err; | |
866 | ||
867 | spin_lock(&np->rx_lock); | |
868 | ||
0d160211 JF |
869 | skb_queue_head_init(&rxq); |
870 | skb_queue_head_init(&errq); | |
871 | skb_queue_head_init(&tmpq); | |
872 | ||
0d160211 JF |
873 | rp = np->rx.sring->rsp_prod; |
874 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | |
875 | ||
876 | i = np->rx.rsp_cons; | |
877 | work_done = 0; | |
878 | while ((i != rp) && (work_done < budget)) { | |
879 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | |
880 | memset(extras, 0, sizeof(rinfo.extras)); | |
881 | ||
882 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | |
883 | ||
884 | if (unlikely(err)) { | |
885 | err: | |
886 | while ((skb = __skb_dequeue(&tmpq))) | |
887 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 888 | dev->stats.rx_errors++; |
0d160211 JF |
889 | i = np->rx.rsp_cons; |
890 | continue; | |
891 | } | |
892 | ||
893 | skb = __skb_dequeue(&tmpq); | |
894 | ||
895 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
896 | struct xen_netif_extra_info *gso; | |
897 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
898 | ||
899 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
900 | __skb_queue_head(&tmpq, skb); | |
901 | np->rx.rsp_cons += skb_queue_len(&tmpq); | |
902 | goto err; | |
903 | } | |
904 | } | |
905 | ||
906 | NETFRONT_SKB_CB(skb)->page = skb_shinfo(skb)->frags[0].page; | |
907 | NETFRONT_SKB_CB(skb)->offset = rx->offset; | |
908 | ||
909 | len = rx->status; | |
910 | if (len > RX_COPY_THRESHOLD) | |
911 | len = RX_COPY_THRESHOLD; | |
912 | skb_put(skb, len); | |
913 | ||
914 | if (rx->status > len) { | |
915 | skb_shinfo(skb)->frags[0].page_offset = | |
916 | rx->offset + len; | |
917 | skb_shinfo(skb)->frags[0].size = rx->status - len; | |
918 | skb->data_len = rx->status - len; | |
919 | } else { | |
920 | skb_shinfo(skb)->frags[0].page = NULL; | |
921 | skb_shinfo(skb)->nr_frags = 0; | |
922 | } | |
923 | ||
924 | i = xennet_fill_frags(np, skb, &tmpq); | |
925 | ||
926 | /* | |
927 | * Truesize approximates the size of true data plus | |
928 | * any supervisor overheads. Adding hypervisor | |
929 | * overheads has been shown to significantly reduce | |
930 | * achievable bandwidth with the default receive | |
931 | * buffer size. It is therefore not wise to account | |
932 | * for it here. | |
933 | * | |
934 | * After alloc_skb(RX_COPY_THRESHOLD), truesize is set | |
935 | * to RX_COPY_THRESHOLD + the supervisor | |
936 | * overheads. Here, we add the size of the data pulled | |
937 | * in xennet_fill_frags(). | |
938 | * | |
939 | * We also adjust for any unused space in the main | |
940 | * data area by subtracting (RX_COPY_THRESHOLD - | |
941 | * len). This is especially important with drivers | |
942 | * which split incoming packets into header and data, | |
943 | * using only 66 bytes of the main data area (see the | |
944 | * e1000 driver for example.) On such systems, | |
945 | * without this last adjustement, our achievable | |
946 | * receive throughout using the standard receive | |
947 | * buffer size was cut by 25%(!!!). | |
948 | */ | |
949 | skb->truesize += skb->data_len - (RX_COPY_THRESHOLD - len); | |
950 | skb->len += skb->data_len; | |
951 | ||
952 | if (rx->flags & NETRXF_csum_blank) | |
953 | skb->ip_summed = CHECKSUM_PARTIAL; | |
954 | else if (rx->flags & NETRXF_data_validated) | |
955 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
956 | ||
957 | __skb_queue_tail(&rxq, skb); | |
958 | ||
959 | np->rx.rsp_cons = ++i; | |
960 | work_done++; | |
961 | } | |
962 | ||
56cfe5d0 | 963 | __skb_queue_purge(&errq); |
0d160211 JF |
964 | |
965 | work_done -= handle_incoming_queue(dev, &rxq); | |
966 | ||
967 | /* If we get a callback with very few responses, reduce fill target. */ | |
968 | /* NB. Note exponential increase, linear decrease. */ | |
969 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > | |
970 | ((3*np->rx_target) / 4)) && | |
971 | (--np->rx_target < np->rx_min_target)) | |
972 | np->rx_target = np->rx_min_target; | |
973 | ||
974 | xennet_alloc_rx_buffers(dev); | |
975 | ||
0d160211 | 976 | if (work_done < budget) { |
bea3348e SH |
977 | int more_to_do = 0; |
978 | ||
0d160211 JF |
979 | local_irq_save(flags); |
980 | ||
981 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | |
982 | if (!more_to_do) | |
bea3348e | 983 | __netif_rx_complete(dev, napi); |
0d160211 JF |
984 | |
985 | local_irq_restore(flags); | |
986 | } | |
987 | ||
988 | spin_unlock(&np->rx_lock); | |
989 | ||
bea3348e | 990 | return work_done; |
0d160211 JF |
991 | } |
992 | ||
993 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
994 | { | |
995 | int max = xennet_can_sg(dev) ? 65535 - ETH_HLEN : ETH_DATA_LEN; | |
996 | ||
997 | if (mtu > max) | |
998 | return -EINVAL; | |
999 | dev->mtu = mtu; | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static void xennet_release_tx_bufs(struct netfront_info *np) | |
1004 | { | |
1005 | struct sk_buff *skb; | |
1006 | int i; | |
1007 | ||
1008 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1009 | /* Skip over entries which are actually freelist references */ | |
1ffb40b8 | 1010 | if (skb_entry_is_link(&np->tx_skbs[i])) |
0d160211 JF |
1011 | continue; |
1012 | ||
1013 | skb = np->tx_skbs[i].skb; | |
1014 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], | |
1015 | GNTMAP_readonly); | |
1016 | gnttab_release_grant_reference(&np->gref_tx_head, | |
1017 | np->grant_tx_ref[i]); | |
1018 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1019 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | |
1020 | dev_kfree_skb_irq(skb); | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | static void xennet_release_rx_bufs(struct netfront_info *np) | |
1025 | { | |
1026 | struct mmu_update *mmu = np->rx_mmu; | |
1027 | struct multicall_entry *mcl = np->rx_mcl; | |
1028 | struct sk_buff_head free_list; | |
1029 | struct sk_buff *skb; | |
1030 | unsigned long mfn; | |
1031 | int xfer = 0, noxfer = 0, unused = 0; | |
1032 | int id, ref; | |
1033 | ||
1034 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", | |
1035 | __func__); | |
1036 | return; | |
1037 | ||
1038 | skb_queue_head_init(&free_list); | |
1039 | ||
1040 | spin_lock_bh(&np->rx_lock); | |
1041 | ||
1042 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
1043 | ref = np->grant_rx_ref[id]; | |
1044 | if (ref == GRANT_INVALID_REF) { | |
1045 | unused++; | |
1046 | continue; | |
1047 | } | |
1048 | ||
1049 | skb = np->rx_skbs[id]; | |
1050 | mfn = gnttab_end_foreign_transfer_ref(ref); | |
1051 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
1052 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | |
1053 | ||
1054 | if (0 == mfn) { | |
1055 | skb_shinfo(skb)->nr_frags = 0; | |
1056 | dev_kfree_skb(skb); | |
1057 | noxfer++; | |
1058 | continue; | |
1059 | } | |
1060 | ||
1061 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1062 | /* Remap the page. */ | |
1063 | struct page *page = skb_shinfo(skb)->frags[0].page; | |
1064 | unsigned long pfn = page_to_pfn(page); | |
1065 | void *vaddr = page_address(page); | |
1066 | ||
1067 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, | |
1068 | mfn_pte(mfn, PAGE_KERNEL), | |
1069 | 0); | |
1070 | mcl++; | |
1071 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) | |
1072 | | MMU_MACHPHYS_UPDATE; | |
1073 | mmu->val = pfn; | |
1074 | mmu++; | |
1075 | ||
1076 | set_phys_to_machine(pfn, mfn); | |
1077 | } | |
1078 | __skb_queue_tail(&free_list, skb); | |
1079 | xfer++; | |
1080 | } | |
1081 | ||
1082 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", | |
1083 | __func__, xfer, noxfer, unused); | |
1084 | ||
1085 | if (xfer) { | |
1086 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1087 | /* Do all the remapping work and M2P updates. */ | |
1088 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, | |
79ea13ce | 1089 | NULL, DOMID_SELF); |
0d160211 JF |
1090 | mcl++; |
1091 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); | |
1092 | } | |
1093 | } | |
1094 | ||
56cfe5d0 | 1095 | __skb_queue_purge(&free_list); |
0d160211 JF |
1096 | |
1097 | spin_unlock_bh(&np->rx_lock); | |
1098 | } | |
1099 | ||
1100 | static void xennet_uninit(struct net_device *dev) | |
1101 | { | |
1102 | struct netfront_info *np = netdev_priv(dev); | |
1103 | xennet_release_tx_bufs(np); | |
1104 | xennet_release_rx_bufs(np); | |
1105 | gnttab_free_grant_references(np->gref_tx_head); | |
1106 | gnttab_free_grant_references(np->gref_rx_head); | |
1107 | } | |
1108 | ||
1109 | static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev) | |
1110 | { | |
1111 | int i, err; | |
1112 | struct net_device *netdev; | |
1113 | struct netfront_info *np; | |
1114 | ||
1115 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | |
1116 | if (!netdev) { | |
1117 | printk(KERN_WARNING "%s> alloc_etherdev failed.\n", | |
1118 | __func__); | |
1119 | return ERR_PTR(-ENOMEM); | |
1120 | } | |
1121 | ||
1122 | np = netdev_priv(netdev); | |
1123 | np->xbdev = dev; | |
1124 | ||
1125 | spin_lock_init(&np->tx_lock); | |
1126 | spin_lock_init(&np->rx_lock); | |
1127 | ||
1128 | skb_queue_head_init(&np->rx_batch); | |
1129 | np->rx_target = RX_DFL_MIN_TARGET; | |
1130 | np->rx_min_target = RX_DFL_MIN_TARGET; | |
1131 | np->rx_max_target = RX_MAX_TARGET; | |
1132 | ||
1133 | init_timer(&np->rx_refill_timer); | |
1134 | np->rx_refill_timer.data = (unsigned long)netdev; | |
1135 | np->rx_refill_timer.function = rx_refill_timeout; | |
1136 | ||
1137 | /* Initialise tx_skbs as a free chain containing every entry. */ | |
1138 | np->tx_skb_freelist = 0; | |
1139 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1ffb40b8 | 1140 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
0d160211 JF |
1141 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1142 | } | |
1143 | ||
1144 | /* Clear out rx_skbs */ | |
1145 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1146 | np->rx_skbs[i] = NULL; | |
1147 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1148 | } | |
1149 | ||
1150 | /* A grant for every tx ring slot */ | |
1151 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | |
1152 | &np->gref_tx_head) < 0) { | |
1153 | printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); | |
1154 | err = -ENOMEM; | |
1155 | goto exit; | |
1156 | } | |
1157 | /* A grant for every rx ring slot */ | |
1158 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | |
1159 | &np->gref_rx_head) < 0) { | |
1160 | printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); | |
1161 | err = -ENOMEM; | |
1162 | goto exit_free_tx; | |
1163 | } | |
1164 | ||
1165 | netdev->open = xennet_open; | |
1166 | netdev->hard_start_xmit = xennet_start_xmit; | |
1167 | netdev->stop = xennet_close; | |
bea3348e | 1168 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
0d160211 JF |
1169 | netdev->uninit = xennet_uninit; |
1170 | netdev->change_mtu = xennet_change_mtu; | |
0d160211 JF |
1171 | netdev->features = NETIF_F_IP_CSUM; |
1172 | ||
1173 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); | |
0d160211 JF |
1174 | SET_NETDEV_DEV(netdev, &dev->dev); |
1175 | ||
1176 | np->netdev = netdev; | |
1177 | ||
1178 | netif_carrier_off(netdev); | |
1179 | ||
1180 | return netdev; | |
1181 | ||
1182 | exit_free_tx: | |
1183 | gnttab_free_grant_references(np->gref_tx_head); | |
1184 | exit: | |
1185 | free_netdev(netdev); | |
1186 | return ERR_PTR(err); | |
1187 | } | |
1188 | ||
1189 | /** | |
1190 | * Entry point to this code when a new device is created. Allocate the basic | |
1191 | * structures and the ring buffers for communication with the backend, and | |
1192 | * inform the backend of the appropriate details for those. | |
1193 | */ | |
1194 | static int __devinit netfront_probe(struct xenbus_device *dev, | |
1195 | const struct xenbus_device_id *id) | |
1196 | { | |
1197 | int err; | |
1198 | struct net_device *netdev; | |
1199 | struct netfront_info *info; | |
1200 | ||
1201 | netdev = xennet_create_dev(dev); | |
1202 | if (IS_ERR(netdev)) { | |
1203 | err = PTR_ERR(netdev); | |
1204 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1205 | return err; | |
1206 | } | |
1207 | ||
1208 | info = netdev_priv(netdev); | |
1209 | dev->dev.driver_data = info; | |
1210 | ||
1211 | err = register_netdev(info->netdev); | |
1212 | if (err) { | |
1213 | printk(KERN_WARNING "%s: register_netdev err=%d\n", | |
1214 | __func__, err); | |
1215 | goto fail; | |
1216 | } | |
1217 | ||
1218 | err = xennet_sysfs_addif(info->netdev); | |
1219 | if (err) { | |
1220 | unregister_netdev(info->netdev); | |
1221 | printk(KERN_WARNING "%s: add sysfs failed err=%d\n", | |
1222 | __func__, err); | |
1223 | goto fail; | |
1224 | } | |
1225 | ||
1226 | return 0; | |
1227 | ||
1228 | fail: | |
1229 | free_netdev(netdev); | |
1230 | dev->dev.driver_data = NULL; | |
1231 | return err; | |
1232 | } | |
1233 | ||
1234 | static void xennet_end_access(int ref, void *page) | |
1235 | { | |
1236 | /* This frees the page as a side-effect */ | |
1237 | if (ref != GRANT_INVALID_REF) | |
1238 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1239 | } | |
1240 | ||
1241 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1242 | { | |
1243 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | |
1244 | spin_lock_bh(&info->rx_lock); | |
1245 | spin_lock_irq(&info->tx_lock); | |
1246 | netif_carrier_off(info->netdev); | |
1247 | spin_unlock_irq(&info->tx_lock); | |
1248 | spin_unlock_bh(&info->rx_lock); | |
1249 | ||
1250 | if (info->netdev->irq) | |
1251 | unbind_from_irqhandler(info->netdev->irq, info->netdev); | |
1252 | info->evtchn = info->netdev->irq = 0; | |
1253 | ||
1254 | /* End access and free the pages */ | |
1255 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | |
1256 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | |
1257 | ||
1258 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1259 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1260 | info->tx.sring = NULL; | |
1261 | info->rx.sring = NULL; | |
1262 | } | |
1263 | ||
1264 | /** | |
1265 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1266 | * driver restart. We tear down our netif structure and recreate it, but | |
1267 | * leave the device-layer structures intact so that this is transparent to the | |
1268 | * rest of the kernel. | |
1269 | */ | |
1270 | static int netfront_resume(struct xenbus_device *dev) | |
1271 | { | |
1272 | struct netfront_info *info = dev->dev.driver_data; | |
1273 | ||
1274 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1275 | ||
1276 | xennet_disconnect_backend(info); | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1281 | { | |
1282 | char *s, *e, *macstr; | |
1283 | int i; | |
1284 | ||
1285 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1286 | if (IS_ERR(macstr)) | |
1287 | return PTR_ERR(macstr); | |
1288 | ||
1289 | for (i = 0; i < ETH_ALEN; i++) { | |
1290 | mac[i] = simple_strtoul(s, &e, 16); | |
1291 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1292 | kfree(macstr); | |
1293 | return -ENOENT; | |
1294 | } | |
1295 | s = e+1; | |
1296 | } | |
1297 | ||
1298 | kfree(macstr); | |
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) | |
1303 | { | |
1304 | struct net_device *dev = dev_id; | |
1305 | struct netfront_info *np = netdev_priv(dev); | |
1306 | unsigned long flags; | |
1307 | ||
1308 | spin_lock_irqsave(&np->tx_lock, flags); | |
1309 | ||
1310 | if (likely(netif_carrier_ok(dev))) { | |
1311 | xennet_tx_buf_gc(dev); | |
1312 | /* Under tx_lock: protects access to rx shared-ring indexes. */ | |
1313 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
bea3348e | 1314 | netif_rx_schedule(dev, &np->napi); |
0d160211 JF |
1315 | } |
1316 | ||
1317 | spin_unlock_irqrestore(&np->tx_lock, flags); | |
1318 | ||
1319 | return IRQ_HANDLED; | |
1320 | } | |
1321 | ||
1322 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) | |
1323 | { | |
1324 | struct xen_netif_tx_sring *txs; | |
1325 | struct xen_netif_rx_sring *rxs; | |
1326 | int err; | |
1327 | struct net_device *netdev = info->netdev; | |
1328 | ||
1329 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1330 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1331 | info->rx.sring = NULL; | |
1332 | info->tx.sring = NULL; | |
1333 | netdev->irq = 0; | |
1334 | ||
1335 | err = xen_net_read_mac(dev, netdev->dev_addr); | |
1336 | if (err) { | |
1337 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1338 | goto fail; | |
1339 | } | |
1340 | ||
a144ff09 | 1341 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1342 | if (!txs) { |
1343 | err = -ENOMEM; | |
1344 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1345 | goto fail; | |
1346 | } | |
1347 | SHARED_RING_INIT(txs); | |
1348 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | |
1349 | ||
1350 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | |
1351 | if (err < 0) { | |
1352 | free_page((unsigned long)txs); | |
1353 | goto fail; | |
1354 | } | |
1355 | ||
1356 | info->tx_ring_ref = err; | |
a144ff09 | 1357 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1358 | if (!rxs) { |
1359 | err = -ENOMEM; | |
1360 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1361 | goto fail; | |
1362 | } | |
1363 | SHARED_RING_INIT(rxs); | |
1364 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | |
1365 | ||
1366 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | |
1367 | if (err < 0) { | |
1368 | free_page((unsigned long)rxs); | |
1369 | goto fail; | |
1370 | } | |
1371 | info->rx_ring_ref = err; | |
1372 | ||
1373 | err = xenbus_alloc_evtchn(dev, &info->evtchn); | |
1374 | if (err) | |
1375 | goto fail; | |
1376 | ||
1377 | err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, | |
1378 | IRQF_SAMPLE_RANDOM, netdev->name, | |
1379 | netdev); | |
1380 | if (err < 0) | |
1381 | goto fail; | |
1382 | netdev->irq = err; | |
1383 | return 0; | |
1384 | ||
1385 | fail: | |
1386 | return err; | |
1387 | } | |
1388 | ||
1389 | /* Common code used when first setting up, and when resuming. */ | |
1390 | static int talk_to_backend(struct xenbus_device *dev, | |
1391 | struct netfront_info *info) | |
1392 | { | |
1393 | const char *message; | |
1394 | struct xenbus_transaction xbt; | |
1395 | int err; | |
1396 | ||
1397 | /* Create shared ring, alloc event channel. */ | |
1398 | err = setup_netfront(dev, info); | |
1399 | if (err) | |
1400 | goto out; | |
1401 | ||
1402 | again: | |
1403 | err = xenbus_transaction_start(&xbt); | |
1404 | if (err) { | |
1405 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1406 | goto destroy_ring; | |
1407 | } | |
1408 | ||
1409 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | |
1410 | info->tx_ring_ref); | |
1411 | if (err) { | |
1412 | message = "writing tx ring-ref"; | |
1413 | goto abort_transaction; | |
1414 | } | |
1415 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | |
1416 | info->rx_ring_ref); | |
1417 | if (err) { | |
1418 | message = "writing rx ring-ref"; | |
1419 | goto abort_transaction; | |
1420 | } | |
1421 | err = xenbus_printf(xbt, dev->nodename, | |
1422 | "event-channel", "%u", info->evtchn); | |
1423 | if (err) { | |
1424 | message = "writing event-channel"; | |
1425 | goto abort_transaction; | |
1426 | } | |
1427 | ||
1428 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | |
1429 | 1); | |
1430 | if (err) { | |
1431 | message = "writing request-rx-copy"; | |
1432 | goto abort_transaction; | |
1433 | } | |
1434 | ||
1435 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1436 | if (err) { | |
1437 | message = "writing feature-rx-notify"; | |
1438 | goto abort_transaction; | |
1439 | } | |
1440 | ||
1441 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1442 | if (err) { | |
1443 | message = "writing feature-sg"; | |
1444 | goto abort_transaction; | |
1445 | } | |
1446 | ||
1447 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1448 | if (err) { | |
1449 | message = "writing feature-gso-tcpv4"; | |
1450 | goto abort_transaction; | |
1451 | } | |
1452 | ||
1453 | err = xenbus_transaction_end(xbt, 0); | |
1454 | if (err) { | |
1455 | if (err == -EAGAIN) | |
1456 | goto again; | |
1457 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1458 | goto destroy_ring; | |
1459 | } | |
1460 | ||
1461 | return 0; | |
1462 | ||
1463 | abort_transaction: | |
1464 | xenbus_transaction_end(xbt, 1); | |
1465 | xenbus_dev_fatal(dev, err, "%s", message); | |
1466 | destroy_ring: | |
1467 | xennet_disconnect_backend(info); | |
1468 | out: | |
1469 | return err; | |
1470 | } | |
1471 | ||
1472 | static int xennet_set_sg(struct net_device *dev, u32 data) | |
1473 | { | |
1474 | if (data) { | |
1475 | struct netfront_info *np = netdev_priv(dev); | |
1476 | int val; | |
1477 | ||
1478 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | |
1479 | "%d", &val) < 0) | |
1480 | val = 0; | |
1481 | if (!val) | |
1482 | return -ENOSYS; | |
1483 | } else if (dev->mtu > ETH_DATA_LEN) | |
1484 | dev->mtu = ETH_DATA_LEN; | |
1485 | ||
1486 | return ethtool_op_set_sg(dev, data); | |
1487 | } | |
1488 | ||
1489 | static int xennet_set_tso(struct net_device *dev, u32 data) | |
1490 | { | |
1491 | if (data) { | |
1492 | struct netfront_info *np = netdev_priv(dev); | |
1493 | int val; | |
1494 | ||
1495 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1496 | "feature-gso-tcpv4", "%d", &val) < 0) | |
1497 | val = 0; | |
1498 | if (!val) | |
1499 | return -ENOSYS; | |
1500 | } | |
1501 | ||
1502 | return ethtool_op_set_tso(dev, data); | |
1503 | } | |
1504 | ||
1505 | static void xennet_set_features(struct net_device *dev) | |
1506 | { | |
1507 | /* Turn off all GSO bits except ROBUST. */ | |
1508 | dev->features &= (1 << NETIF_F_GSO_SHIFT) - 1; | |
1509 | dev->features |= NETIF_F_GSO_ROBUST; | |
1510 | xennet_set_sg(dev, 0); | |
1511 | ||
1512 | /* We need checksum offload to enable scatter/gather and TSO. */ | |
1513 | if (!(dev->features & NETIF_F_IP_CSUM)) | |
1514 | return; | |
1515 | ||
1516 | if (!xennet_set_sg(dev, 1)) | |
1517 | xennet_set_tso(dev, 1); | |
1518 | } | |
1519 | ||
1520 | static int xennet_connect(struct net_device *dev) | |
1521 | { | |
1522 | struct netfront_info *np = netdev_priv(dev); | |
1523 | int i, requeue_idx, err; | |
1524 | struct sk_buff *skb; | |
1525 | grant_ref_t ref; | |
1526 | struct xen_netif_rx_request *req; | |
1527 | unsigned int feature_rx_copy; | |
1528 | ||
1529 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1530 | "feature-rx-copy", "%u", &feature_rx_copy); | |
1531 | if (err != 1) | |
1532 | feature_rx_copy = 0; | |
1533 | ||
1534 | if (!feature_rx_copy) { | |
1535 | dev_info(&dev->dev, | |
898eb71c | 1536 | "backend does not support copying receive path\n"); |
0d160211 JF |
1537 | return -ENODEV; |
1538 | } | |
1539 | ||
1540 | err = talk_to_backend(np->xbdev, np); | |
1541 | if (err) | |
1542 | return err; | |
1543 | ||
1544 | xennet_set_features(dev); | |
1545 | ||
1546 | spin_lock_bh(&np->rx_lock); | |
1547 | spin_lock_irq(&np->tx_lock); | |
1548 | ||
1549 | /* Step 1: Discard all pending TX packet fragments. */ | |
1550 | xennet_release_tx_bufs(np); | |
1551 | ||
1552 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | |
1553 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | |
1554 | if (!np->rx_skbs[i]) | |
1555 | continue; | |
1556 | ||
1557 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | |
1558 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | |
1559 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | |
1560 | ||
1561 | gnttab_grant_foreign_access_ref( | |
1562 | ref, np->xbdev->otherend_id, | |
1563 | pfn_to_mfn(page_to_pfn(skb_shinfo(skb)-> | |
1564 | frags->page)), | |
1565 | 0); | |
1566 | req->gref = ref; | |
1567 | req->id = requeue_idx; | |
1568 | ||
1569 | requeue_idx++; | |
1570 | } | |
1571 | ||
1572 | np->rx.req_prod_pvt = requeue_idx; | |
1573 | ||
1574 | /* | |
1575 | * Step 3: All public and private state should now be sane. Get | |
1576 | * ready to start sending and receiving packets and give the driver | |
1577 | * domain a kick because we've probably just requeued some | |
1578 | * packets. | |
1579 | */ | |
1580 | netif_carrier_on(np->netdev); | |
1581 | notify_remote_via_irq(np->netdev->irq); | |
1582 | xennet_tx_buf_gc(dev); | |
1583 | xennet_alloc_rx_buffers(dev); | |
1584 | ||
1585 | spin_unlock_irq(&np->tx_lock); | |
1586 | spin_unlock_bh(&np->rx_lock); | |
1587 | ||
1588 | return 0; | |
1589 | } | |
1590 | ||
1591 | /** | |
1592 | * Callback received when the backend's state changes. | |
1593 | */ | |
1594 | static void backend_changed(struct xenbus_device *dev, | |
1595 | enum xenbus_state backend_state) | |
1596 | { | |
1597 | struct netfront_info *np = dev->dev.driver_data; | |
1598 | struct net_device *netdev = np->netdev; | |
1599 | ||
1600 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
1601 | ||
1602 | switch (backend_state) { | |
1603 | case XenbusStateInitialising: | |
1604 | case XenbusStateInitialised: | |
1605 | case XenbusStateConnected: | |
1606 | case XenbusStateUnknown: | |
1607 | case XenbusStateClosed: | |
1608 | break; | |
1609 | ||
1610 | case XenbusStateInitWait: | |
1611 | if (dev->state != XenbusStateInitialising) | |
1612 | break; | |
1613 | if (xennet_connect(netdev) != 0) | |
1614 | break; | |
1615 | xenbus_switch_state(dev, XenbusStateConnected); | |
1616 | break; | |
1617 | ||
1618 | case XenbusStateClosing: | |
1619 | xenbus_frontend_closed(dev); | |
1620 | break; | |
1621 | } | |
1622 | } | |
1623 | ||
1624 | static struct ethtool_ops xennet_ethtool_ops = | |
1625 | { | |
0d160211 | 1626 | .set_tx_csum = ethtool_op_set_tx_csum, |
0d160211 | 1627 | .set_sg = xennet_set_sg, |
0d160211 JF |
1628 | .set_tso = xennet_set_tso, |
1629 | .get_link = ethtool_op_get_link, | |
1630 | }; | |
1631 | ||
1632 | #ifdef CONFIG_SYSFS | |
1633 | static ssize_t show_rxbuf_min(struct device *dev, | |
1634 | struct device_attribute *attr, char *buf) | |
1635 | { | |
1636 | struct net_device *netdev = to_net_dev(dev); | |
1637 | struct netfront_info *info = netdev_priv(netdev); | |
1638 | ||
1639 | return sprintf(buf, "%u\n", info->rx_min_target); | |
1640 | } | |
1641 | ||
1642 | static ssize_t store_rxbuf_min(struct device *dev, | |
1643 | struct device_attribute *attr, | |
1644 | const char *buf, size_t len) | |
1645 | { | |
1646 | struct net_device *netdev = to_net_dev(dev); | |
1647 | struct netfront_info *np = netdev_priv(netdev); | |
1648 | char *endp; | |
1649 | unsigned long target; | |
1650 | ||
1651 | if (!capable(CAP_NET_ADMIN)) | |
1652 | return -EPERM; | |
1653 | ||
1654 | target = simple_strtoul(buf, &endp, 0); | |
1655 | if (endp == buf) | |
1656 | return -EBADMSG; | |
1657 | ||
1658 | if (target < RX_MIN_TARGET) | |
1659 | target = RX_MIN_TARGET; | |
1660 | if (target > RX_MAX_TARGET) | |
1661 | target = RX_MAX_TARGET; | |
1662 | ||
1663 | spin_lock_bh(&np->rx_lock); | |
1664 | if (target > np->rx_max_target) | |
1665 | np->rx_max_target = target; | |
1666 | np->rx_min_target = target; | |
1667 | if (target > np->rx_target) | |
1668 | np->rx_target = target; | |
1669 | ||
1670 | xennet_alloc_rx_buffers(netdev); | |
1671 | ||
1672 | spin_unlock_bh(&np->rx_lock); | |
1673 | return len; | |
1674 | } | |
1675 | ||
1676 | static ssize_t show_rxbuf_max(struct device *dev, | |
1677 | struct device_attribute *attr, char *buf) | |
1678 | { | |
1679 | struct net_device *netdev = to_net_dev(dev); | |
1680 | struct netfront_info *info = netdev_priv(netdev); | |
1681 | ||
1682 | return sprintf(buf, "%u\n", info->rx_max_target); | |
1683 | } | |
1684 | ||
1685 | static ssize_t store_rxbuf_max(struct device *dev, | |
1686 | struct device_attribute *attr, | |
1687 | const char *buf, size_t len) | |
1688 | { | |
1689 | struct net_device *netdev = to_net_dev(dev); | |
1690 | struct netfront_info *np = netdev_priv(netdev); | |
1691 | char *endp; | |
1692 | unsigned long target; | |
1693 | ||
1694 | if (!capable(CAP_NET_ADMIN)) | |
1695 | return -EPERM; | |
1696 | ||
1697 | target = simple_strtoul(buf, &endp, 0); | |
1698 | if (endp == buf) | |
1699 | return -EBADMSG; | |
1700 | ||
1701 | if (target < RX_MIN_TARGET) | |
1702 | target = RX_MIN_TARGET; | |
1703 | if (target > RX_MAX_TARGET) | |
1704 | target = RX_MAX_TARGET; | |
1705 | ||
1706 | spin_lock_bh(&np->rx_lock); | |
1707 | if (target < np->rx_min_target) | |
1708 | np->rx_min_target = target; | |
1709 | np->rx_max_target = target; | |
1710 | if (target < np->rx_target) | |
1711 | np->rx_target = target; | |
1712 | ||
1713 | xennet_alloc_rx_buffers(netdev); | |
1714 | ||
1715 | spin_unlock_bh(&np->rx_lock); | |
1716 | return len; | |
1717 | } | |
1718 | ||
1719 | static ssize_t show_rxbuf_cur(struct device *dev, | |
1720 | struct device_attribute *attr, char *buf) | |
1721 | { | |
1722 | struct net_device *netdev = to_net_dev(dev); | |
1723 | struct netfront_info *info = netdev_priv(netdev); | |
1724 | ||
1725 | return sprintf(buf, "%u\n", info->rx_target); | |
1726 | } | |
1727 | ||
1728 | static struct device_attribute xennet_attrs[] = { | |
1729 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | |
1730 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | |
1731 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | |
1732 | }; | |
1733 | ||
1734 | static int xennet_sysfs_addif(struct net_device *netdev) | |
1735 | { | |
1736 | int i; | |
1737 | int err; | |
1738 | ||
1739 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | |
1740 | err = device_create_file(&netdev->dev, | |
1741 | &xennet_attrs[i]); | |
1742 | if (err) | |
1743 | goto fail; | |
1744 | } | |
1745 | return 0; | |
1746 | ||
1747 | fail: | |
1748 | while (--i >= 0) | |
1749 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1750 | return err; | |
1751 | } | |
1752 | ||
1753 | static void xennet_sysfs_delif(struct net_device *netdev) | |
1754 | { | |
1755 | int i; | |
1756 | ||
1757 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | |
1758 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1759 | } | |
1760 | ||
1761 | #endif /* CONFIG_SYSFS */ | |
1762 | ||
1763 | static struct xenbus_device_id netfront_ids[] = { | |
1764 | { "vif" }, | |
1765 | { "" } | |
1766 | }; | |
1767 | ||
1768 | ||
1769 | static int __devexit xennet_remove(struct xenbus_device *dev) | |
1770 | { | |
1771 | struct netfront_info *info = dev->dev.driver_data; | |
1772 | ||
1773 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1774 | ||
1775 | unregister_netdev(info->netdev); | |
1776 | ||
1777 | xennet_disconnect_backend(info); | |
1778 | ||
1779 | del_timer_sync(&info->rx_refill_timer); | |
1780 | ||
1781 | xennet_sysfs_delif(info->netdev); | |
1782 | ||
1783 | free_netdev(info->netdev); | |
1784 | ||
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | static struct xenbus_driver netfront = { | |
1789 | .name = "vif", | |
1790 | .owner = THIS_MODULE, | |
1791 | .ids = netfront_ids, | |
1792 | .probe = netfront_probe, | |
1793 | .remove = __devexit_p(xennet_remove), | |
1794 | .resume = netfront_resume, | |
1795 | .otherend_changed = backend_changed, | |
1796 | }; | |
1797 | ||
1798 | static int __init netif_init(void) | |
1799 | { | |
6e833587 | 1800 | if (!xen_domain()) |
0d160211 JF |
1801 | return -ENODEV; |
1802 | ||
6e833587 | 1803 | if (xen_initial_domain()) |
0d160211 JF |
1804 | return 0; |
1805 | ||
1806 | printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); | |
1807 | ||
1808 | return xenbus_register_frontend(&netfront); | |
1809 | } | |
1810 | module_init(netif_init); | |
1811 | ||
1812 | ||
1813 | static void __exit netif_exit(void) | |
1814 | { | |
6e833587 | 1815 | if (xen_initial_domain()) |
0d160211 JF |
1816 | return; |
1817 | ||
ab59859d | 1818 | xenbus_unregister_driver(&netfront); |
0d160211 JF |
1819 | } |
1820 | module_exit(netif_exit); | |
1821 | ||
1822 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
1823 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 1824 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 1825 | MODULE_ALIAS("xennet"); |