Commit | Line | Data |
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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> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
0d160211 JF |
44 | #include <net/ip.h> |
45 | ||
1ccbf534 | 46 | #include <xen/xen.h> |
0d160211 JF |
47 | #include <xen/xenbus.h> |
48 | #include <xen/events.h> | |
49 | #include <xen/page.h> | |
50 | #include <xen/grant_table.h> | |
51 | ||
52 | #include <xen/interface/io/netif.h> | |
53 | #include <xen/interface/memory.h> | |
54 | #include <xen/interface/grant_table.h> | |
55 | ||
0fc0b732 | 56 | static const struct ethtool_ops xennet_ethtool_ops; |
0d160211 JF |
57 | |
58 | struct netfront_cb { | |
59 | struct page *page; | |
60 | unsigned offset; | |
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 | ||
667c78af JF |
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) | |
0d160211 JF |
71 | #define TX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) |
72 | ||
73 | struct netfront_info { | |
74 | struct list_head list; | |
75 | struct net_device *netdev; | |
76 | ||
bea3348e | 77 | struct napi_struct napi; |
0d160211 | 78 | |
0d160211 | 79 | unsigned int evtchn; |
84284d3c | 80 | struct xenbus_device *xbdev; |
0d160211 | 81 | |
84284d3c JF |
82 | spinlock_t tx_lock; |
83 | struct xen_netif_tx_front_ring tx; | |
84 | int tx_ring_ref; | |
0d160211 JF |
85 | |
86 | /* | |
87 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries | |
88 | * are linked from tx_skb_freelist through skb_entry.link. | |
89 | * | |
90 | * NB. Freelist index entries are always going to be less than | |
91 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or | |
92 | * greater than PAGE_OFFSET: we use this property to distinguish | |
93 | * them. | |
94 | */ | |
95 | union skb_entry { | |
96 | struct sk_buff *skb; | |
1ffb40b8 | 97 | unsigned long link; |
0d160211 JF |
98 | } tx_skbs[NET_TX_RING_SIZE]; |
99 | grant_ref_t gref_tx_head; | |
100 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | |
101 | unsigned tx_skb_freelist; | |
102 | ||
84284d3c JF |
103 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
104 | struct xen_netif_rx_front_ring rx; | |
105 | int rx_ring_ref; | |
106 | ||
107 | /* Receive-ring batched refills. */ | |
108 | #define RX_MIN_TARGET 8 | |
109 | #define RX_DFL_MIN_TARGET 64 | |
110 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | |
111 | unsigned rx_min_target, rx_max_target, rx_target; | |
112 | struct sk_buff_head rx_batch; | |
113 | ||
114 | struct timer_list rx_refill_timer; | |
115 | ||
0d160211 JF |
116 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
117 | grant_ref_t gref_rx_head; | |
118 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; | |
119 | ||
0d160211 JF |
120 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; |
121 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; | |
122 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; | |
e0ce4af9 IC |
123 | |
124 | /* Statistics */ | |
e9a799ea | 125 | unsigned long rx_gso_checksum_fixup; |
0d160211 JF |
126 | }; |
127 | ||
128 | struct netfront_rx_info { | |
129 | struct xen_netif_rx_response rx; | |
130 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; | |
131 | }; | |
132 | ||
1ffb40b8 IY |
133 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
134 | { | |
135 | list->link = id; | |
136 | } | |
137 | ||
138 | static int skb_entry_is_link(const union skb_entry *list) | |
139 | { | |
140 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); | |
807540ba | 141 | return (unsigned long)list->skb < PAGE_OFFSET; |
1ffb40b8 IY |
142 | } |
143 | ||
0d160211 JF |
144 | /* |
145 | * Access macros for acquiring freeing slots in tx_skbs[]. | |
146 | */ | |
147 | ||
148 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, | |
149 | unsigned short id) | |
150 | { | |
1ffb40b8 | 151 | skb_entry_set_link(&list[id], *head); |
0d160211 JF |
152 | *head = id; |
153 | } | |
154 | ||
155 | static unsigned short get_id_from_freelist(unsigned *head, | |
156 | union skb_entry *list) | |
157 | { | |
158 | unsigned int id = *head; | |
159 | *head = list[id].link; | |
160 | return id; | |
161 | } | |
162 | ||
163 | static int xennet_rxidx(RING_IDX idx) | |
164 | { | |
165 | return idx & (NET_RX_RING_SIZE - 1); | |
166 | } | |
167 | ||
168 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, | |
169 | RING_IDX ri) | |
170 | { | |
171 | int i = xennet_rxidx(ri); | |
172 | struct sk_buff *skb = np->rx_skbs[i]; | |
173 | np->rx_skbs[i] = NULL; | |
174 | return skb; | |
175 | } | |
176 | ||
177 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, | |
178 | RING_IDX ri) | |
179 | { | |
180 | int i = xennet_rxidx(ri); | |
181 | grant_ref_t ref = np->grant_rx_ref[i]; | |
182 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
183 | return ref; | |
184 | } | |
185 | ||
186 | #ifdef CONFIG_SYSFS | |
187 | static int xennet_sysfs_addif(struct net_device *netdev); | |
188 | static void xennet_sysfs_delif(struct net_device *netdev); | |
189 | #else /* !CONFIG_SYSFS */ | |
190 | #define xennet_sysfs_addif(dev) (0) | |
191 | #define xennet_sysfs_delif(dev) do { } while (0) | |
192 | #endif | |
193 | ||
194 | static int xennet_can_sg(struct net_device *dev) | |
195 | { | |
196 | return dev->features & NETIF_F_SG; | |
197 | } | |
198 | ||
199 | ||
200 | static void rx_refill_timeout(unsigned long data) | |
201 | { | |
202 | struct net_device *dev = (struct net_device *)data; | |
bea3348e | 203 | struct netfront_info *np = netdev_priv(dev); |
288379f0 | 204 | napi_schedule(&np->napi); |
0d160211 JF |
205 | } |
206 | ||
207 | static int netfront_tx_slot_available(struct netfront_info *np) | |
208 | { | |
807540ba ED |
209 | return (np->tx.req_prod_pvt - np->tx.rsp_cons) < |
210 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2); | |
0d160211 JF |
211 | } |
212 | ||
213 | static void xennet_maybe_wake_tx(struct net_device *dev) | |
214 | { | |
215 | struct netfront_info *np = netdev_priv(dev); | |
216 | ||
217 | if (unlikely(netif_queue_stopped(dev)) && | |
218 | netfront_tx_slot_available(np) && | |
219 | likely(netif_running(dev))) | |
220 | netif_wake_queue(dev); | |
221 | } | |
222 | ||
223 | static void xennet_alloc_rx_buffers(struct net_device *dev) | |
224 | { | |
225 | unsigned short id; | |
226 | struct netfront_info *np = netdev_priv(dev); | |
227 | struct sk_buff *skb; | |
228 | struct page *page; | |
229 | int i, batch_target, notify; | |
230 | RING_IDX req_prod = np->rx.req_prod_pvt; | |
0d160211 JF |
231 | grant_ref_t ref; |
232 | unsigned long pfn; | |
233 | void *vaddr; | |
0d160211 JF |
234 | struct xen_netif_rx_request *req; |
235 | ||
236 | if (unlikely(!netif_carrier_ok(dev))) | |
237 | return; | |
238 | ||
239 | /* | |
240 | * Allocate skbuffs greedily, even though we batch updates to the | |
241 | * receive ring. This creates a less bursty demand on the memory | |
242 | * allocator, so should reduce the chance of failed allocation requests | |
243 | * both for ourself and for other kernel subsystems. | |
244 | */ | |
245 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); | |
246 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { | |
617a20bb | 247 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, |
0d160211 JF |
248 | GFP_ATOMIC | __GFP_NOWARN); |
249 | if (unlikely(!skb)) | |
250 | goto no_skb; | |
251 | ||
617a20bb IY |
252 | /* Align ip header to a 16 bytes boundary */ |
253 | skb_reserve(skb, NET_IP_ALIGN); | |
254 | ||
0d160211 JF |
255 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
256 | if (!page) { | |
257 | kfree_skb(skb); | |
258 | no_skb: | |
259 | /* Any skbuffs queued for refill? Force them out. */ | |
260 | if (i != 0) | |
261 | goto refill; | |
262 | /* Could not allocate any skbuffs. Try again later. */ | |
263 | mod_timer(&np->rx_refill_timer, | |
264 | jiffies + (HZ/10)); | |
265 | break; | |
266 | } | |
267 | ||
268 | skb_shinfo(skb)->frags[0].page = page; | |
269 | skb_shinfo(skb)->nr_frags = 1; | |
270 | __skb_queue_tail(&np->rx_batch, skb); | |
271 | } | |
272 | ||
273 | /* Is the batch large enough to be worthwhile? */ | |
274 | if (i < (np->rx_target/2)) { | |
275 | if (req_prod > np->rx.sring->req_prod) | |
276 | goto push; | |
277 | return; | |
278 | } | |
279 | ||
280 | /* Adjust our fill target if we risked running out of buffers. */ | |
281 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && | |
282 | ((np->rx_target *= 2) > np->rx_max_target)) | |
283 | np->rx_target = np->rx_max_target; | |
284 | ||
285 | refill: | |
5dcddfae | 286 | for (i = 0; ; i++) { |
0d160211 JF |
287 | skb = __skb_dequeue(&np->rx_batch); |
288 | if (skb == NULL) | |
289 | break; | |
290 | ||
291 | skb->dev = dev; | |
292 | ||
293 | id = xennet_rxidx(req_prod + i); | |
294 | ||
295 | BUG_ON(np->rx_skbs[id]); | |
296 | np->rx_skbs[id] = skb; | |
297 | ||
298 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); | |
299 | BUG_ON((signed short)ref < 0); | |
300 | np->grant_rx_ref[id] = ref; | |
301 | ||
302 | pfn = page_to_pfn(skb_shinfo(skb)->frags[0].page); | |
303 | vaddr = page_address(skb_shinfo(skb)->frags[0].page); | |
304 | ||
305 | req = RING_GET_REQUEST(&np->rx, req_prod + i); | |
306 | gnttab_grant_foreign_access_ref(ref, | |
307 | np->xbdev->otherend_id, | |
308 | pfn_to_mfn(pfn), | |
309 | 0); | |
310 | ||
311 | req->id = id; | |
312 | req->gref = ref; | |
313 | } | |
314 | ||
5dcddfae | 315 | wmb(); /* barrier so backend seens requests */ |
0d160211 JF |
316 | |
317 | /* Above is a suitable barrier to ensure backend will see requests. */ | |
318 | np->rx.req_prod_pvt = req_prod + i; | |
319 | push: | |
320 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); | |
321 | if (notify) | |
322 | notify_remote_via_irq(np->netdev->irq); | |
323 | } | |
324 | ||
325 | static int xennet_open(struct net_device *dev) | |
326 | { | |
327 | struct netfront_info *np = netdev_priv(dev); | |
328 | ||
bea3348e SH |
329 | napi_enable(&np->napi); |
330 | ||
0d160211 JF |
331 | spin_lock_bh(&np->rx_lock); |
332 | if (netif_carrier_ok(dev)) { | |
333 | xennet_alloc_rx_buffers(dev); | |
334 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; | |
335 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
288379f0 | 336 | napi_schedule(&np->napi); |
0d160211 JF |
337 | } |
338 | spin_unlock_bh(&np->rx_lock); | |
339 | ||
0b1ab1b8 | 340 | netif_start_queue(dev); |
0d160211 JF |
341 | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static void xennet_tx_buf_gc(struct net_device *dev) | |
346 | { | |
347 | RING_IDX cons, prod; | |
348 | unsigned short id; | |
349 | struct netfront_info *np = netdev_priv(dev); | |
350 | struct sk_buff *skb; | |
351 | ||
352 | BUG_ON(!netif_carrier_ok(dev)); | |
353 | ||
354 | do { | |
355 | prod = np->tx.sring->rsp_prod; | |
356 | rmb(); /* Ensure we see responses up to 'rp'. */ | |
357 | ||
358 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { | |
359 | struct xen_netif_tx_response *txrsp; | |
360 | ||
361 | txrsp = RING_GET_RESPONSE(&np->tx, cons); | |
f942dc25 | 362 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
0d160211 JF |
363 | continue; |
364 | ||
365 | id = txrsp->id; | |
366 | skb = np->tx_skbs[id].skb; | |
367 | if (unlikely(gnttab_query_foreign_access( | |
368 | np->grant_tx_ref[id]) != 0)) { | |
369 | printk(KERN_ALERT "xennet_tx_buf_gc: warning " | |
370 | "-- grant still in use by backend " | |
371 | "domain.\n"); | |
372 | BUG(); | |
373 | } | |
374 | gnttab_end_foreign_access_ref( | |
375 | np->grant_tx_ref[id], GNTMAP_readonly); | |
376 | gnttab_release_grant_reference( | |
377 | &np->gref_tx_head, np->grant_tx_ref[id]); | |
378 | np->grant_tx_ref[id] = GRANT_INVALID_REF; | |
379 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); | |
380 | dev_kfree_skb_irq(skb); | |
381 | } | |
382 | ||
383 | np->tx.rsp_cons = prod; | |
384 | ||
385 | /* | |
386 | * Set a new event, then check for race with update of tx_cons. | |
387 | * Note that it is essential to schedule a callback, no matter | |
388 | * how few buffers are pending. Even if there is space in the | |
389 | * transmit ring, higher layers may be blocked because too much | |
390 | * data is outstanding: in such cases notification from Xen is | |
391 | * likely to be the only kick that we'll get. | |
392 | */ | |
393 | np->tx.sring->rsp_event = | |
394 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; | |
395 | mb(); /* update shared area */ | |
396 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); | |
397 | ||
398 | xennet_maybe_wake_tx(dev); | |
399 | } | |
400 | ||
401 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, | |
402 | struct xen_netif_tx_request *tx) | |
403 | { | |
404 | struct netfront_info *np = netdev_priv(dev); | |
405 | char *data = skb->data; | |
406 | unsigned long mfn; | |
407 | RING_IDX prod = np->tx.req_prod_pvt; | |
408 | int frags = skb_shinfo(skb)->nr_frags; | |
409 | unsigned int offset = offset_in_page(data); | |
410 | unsigned int len = skb_headlen(skb); | |
411 | unsigned int id; | |
412 | grant_ref_t ref; | |
413 | int i; | |
414 | ||
415 | /* While the header overlaps a page boundary (including being | |
416 | larger than a page), split it it into page-sized chunks. */ | |
417 | while (len > PAGE_SIZE - offset) { | |
418 | tx->size = PAGE_SIZE - offset; | |
f942dc25 | 419 | tx->flags |= XEN_NETTXF_more_data; |
0d160211 JF |
420 | len -= tx->size; |
421 | data += tx->size; | |
422 | offset = 0; | |
423 | ||
424 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
425 | np->tx_skbs[id].skb = skb_get(skb); | |
426 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
427 | tx->id = id; | |
428 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
429 | BUG_ON((signed short)ref < 0); | |
430 | ||
431 | mfn = virt_to_mfn(data); | |
432 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
433 | mfn, GNTMAP_readonly); | |
434 | ||
435 | tx->gref = np->grant_tx_ref[id] = ref; | |
436 | tx->offset = offset; | |
437 | tx->size = len; | |
438 | tx->flags = 0; | |
439 | } | |
440 | ||
441 | /* Grant backend access to each skb fragment page. */ | |
442 | for (i = 0; i < frags; i++) { | |
443 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
444 | ||
f942dc25 | 445 | tx->flags |= XEN_NETTXF_more_data; |
0d160211 JF |
446 | |
447 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
448 | np->tx_skbs[id].skb = skb_get(skb); | |
449 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
450 | tx->id = id; | |
451 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
452 | BUG_ON((signed short)ref < 0); | |
453 | ||
454 | mfn = pfn_to_mfn(page_to_pfn(frag->page)); | |
455 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
456 | mfn, GNTMAP_readonly); | |
457 | ||
458 | tx->gref = np->grant_tx_ref[id] = ref; | |
459 | tx->offset = frag->page_offset; | |
460 | tx->size = frag->size; | |
461 | tx->flags = 0; | |
462 | } | |
463 | ||
464 | np->tx.req_prod_pvt = prod; | |
465 | } | |
466 | ||
467 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
468 | { | |
469 | unsigned short id; | |
470 | struct netfront_info *np = netdev_priv(dev); | |
471 | struct xen_netif_tx_request *tx; | |
472 | struct xen_netif_extra_info *extra; | |
473 | char *data = skb->data; | |
474 | RING_IDX i; | |
475 | grant_ref_t ref; | |
476 | unsigned long mfn; | |
477 | int notify; | |
478 | int frags = skb_shinfo(skb)->nr_frags; | |
479 | unsigned int offset = offset_in_page(data); | |
480 | unsigned int len = skb_headlen(skb); | |
481 | ||
43526370 | 482 | frags += DIV_ROUND_UP(offset + len, PAGE_SIZE); |
0d160211 JF |
483 | if (unlikely(frags > MAX_SKB_FRAGS + 1)) { |
484 | printk(KERN_ALERT "xennet: skb rides the rocket: %d frags\n", | |
485 | frags); | |
486 | dump_stack(); | |
487 | goto drop; | |
488 | } | |
489 | ||
490 | spin_lock_irq(&np->tx_lock); | |
491 | ||
492 | if (unlikely(!netif_carrier_ok(dev) || | |
493 | (frags > 1 && !xennet_can_sg(dev)) || | |
fc741216 | 494 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
0d160211 JF |
495 | spin_unlock_irq(&np->tx_lock); |
496 | goto drop; | |
497 | } | |
498 | ||
499 | i = np->tx.req_prod_pvt; | |
500 | ||
501 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
502 | np->tx_skbs[id].skb = skb; | |
503 | ||
504 | tx = RING_GET_REQUEST(&np->tx, i); | |
505 | ||
506 | tx->id = id; | |
507 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
508 | BUG_ON((signed short)ref < 0); | |
509 | mfn = virt_to_mfn(data); | |
510 | gnttab_grant_foreign_access_ref( | |
511 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | |
512 | tx->gref = np->grant_tx_ref[id] = ref; | |
513 | tx->offset = offset; | |
514 | tx->size = len; | |
515 | extra = NULL; | |
516 | ||
517 | tx->flags = 0; | |
518 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
519 | /* local packet? */ | |
f942dc25 | 520 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
0d160211 JF |
521 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
522 | /* remote but checksummed. */ | |
f942dc25 | 523 | tx->flags |= XEN_NETTXF_data_validated; |
0d160211 JF |
524 | |
525 | if (skb_shinfo(skb)->gso_size) { | |
526 | struct xen_netif_extra_info *gso; | |
527 | ||
528 | gso = (struct xen_netif_extra_info *) | |
529 | RING_GET_REQUEST(&np->tx, ++i); | |
530 | ||
531 | if (extra) | |
532 | extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; | |
533 | else | |
f942dc25 | 534 | tx->flags |= XEN_NETTXF_extra_info; |
0d160211 JF |
535 | |
536 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
537 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; | |
538 | gso->u.gso.pad = 0; | |
539 | gso->u.gso.features = 0; | |
540 | ||
541 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
542 | gso->flags = 0; | |
543 | extra = gso; | |
544 | } | |
545 | ||
546 | np->tx.req_prod_pvt = i + 1; | |
547 | ||
548 | xennet_make_frags(skb, dev, tx); | |
549 | tx->size = skb->len; | |
550 | ||
551 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | |
552 | if (notify) | |
553 | notify_remote_via_irq(np->netdev->irq); | |
554 | ||
09f75cd7 JG |
555 | dev->stats.tx_bytes += skb->len; |
556 | dev->stats.tx_packets++; | |
10a273a6 JF |
557 | |
558 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
0d160211 JF |
559 | xennet_tx_buf_gc(dev); |
560 | ||
561 | if (!netfront_tx_slot_available(np)) | |
562 | netif_stop_queue(dev); | |
563 | ||
564 | spin_unlock_irq(&np->tx_lock); | |
565 | ||
6ed10654 | 566 | return NETDEV_TX_OK; |
0d160211 JF |
567 | |
568 | drop: | |
09f75cd7 | 569 | dev->stats.tx_dropped++; |
0d160211 | 570 | dev_kfree_skb(skb); |
6ed10654 | 571 | return NETDEV_TX_OK; |
0d160211 JF |
572 | } |
573 | ||
574 | static int xennet_close(struct net_device *dev) | |
575 | { | |
576 | struct netfront_info *np = netdev_priv(dev); | |
577 | netif_stop_queue(np->netdev); | |
bea3348e | 578 | napi_disable(&np->napi); |
0d160211 JF |
579 | return 0; |
580 | } | |
581 | ||
0d160211 JF |
582 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
583 | grant_ref_t ref) | |
584 | { | |
585 | int new = xennet_rxidx(np->rx.req_prod_pvt); | |
586 | ||
587 | BUG_ON(np->rx_skbs[new]); | |
588 | np->rx_skbs[new] = skb; | |
589 | np->grant_rx_ref[new] = ref; | |
590 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | |
591 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | |
592 | np->rx.req_prod_pvt++; | |
593 | } | |
594 | ||
595 | static int xennet_get_extras(struct netfront_info *np, | |
596 | struct xen_netif_extra_info *extras, | |
597 | RING_IDX rp) | |
598 | ||
599 | { | |
600 | struct xen_netif_extra_info *extra; | |
601 | struct device *dev = &np->netdev->dev; | |
602 | RING_IDX cons = np->rx.rsp_cons; | |
603 | int err = 0; | |
604 | ||
605 | do { | |
606 | struct sk_buff *skb; | |
607 | grant_ref_t ref; | |
608 | ||
609 | if (unlikely(cons + 1 == rp)) { | |
610 | if (net_ratelimit()) | |
611 | dev_warn(dev, "Missing extra info\n"); | |
612 | err = -EBADR; | |
613 | break; | |
614 | } | |
615 | ||
616 | extra = (struct xen_netif_extra_info *) | |
617 | RING_GET_RESPONSE(&np->rx, ++cons); | |
618 | ||
619 | if (unlikely(!extra->type || | |
620 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
621 | if (net_ratelimit()) | |
622 | dev_warn(dev, "Invalid extra type: %d\n", | |
623 | extra->type); | |
624 | err = -EINVAL; | |
625 | } else { | |
626 | memcpy(&extras[extra->type - 1], extra, | |
627 | sizeof(*extra)); | |
628 | } | |
629 | ||
630 | skb = xennet_get_rx_skb(np, cons); | |
631 | ref = xennet_get_rx_ref(np, cons); | |
632 | xennet_move_rx_slot(np, skb, ref); | |
633 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | |
634 | ||
635 | np->rx.rsp_cons = cons; | |
636 | return err; | |
637 | } | |
638 | ||
639 | static int xennet_get_responses(struct netfront_info *np, | |
640 | struct netfront_rx_info *rinfo, RING_IDX rp, | |
641 | struct sk_buff_head *list) | |
642 | { | |
643 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
644 | struct xen_netif_extra_info *extras = rinfo->extras; | |
645 | struct device *dev = &np->netdev->dev; | |
646 | RING_IDX cons = np->rx.rsp_cons; | |
647 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | |
648 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | |
649 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | |
650 | int frags = 1; | |
651 | int err = 0; | |
652 | unsigned long ret; | |
653 | ||
f942dc25 | 654 | if (rx->flags & XEN_NETRXF_extra_info) { |
0d160211 JF |
655 | err = xennet_get_extras(np, extras, rp); |
656 | cons = np->rx.rsp_cons; | |
657 | } | |
658 | ||
659 | for (;;) { | |
660 | if (unlikely(rx->status < 0 || | |
661 | rx->offset + rx->status > PAGE_SIZE)) { | |
662 | if (net_ratelimit()) | |
663 | dev_warn(dev, "rx->offset: %x, size: %u\n", | |
664 | rx->offset, rx->status); | |
665 | xennet_move_rx_slot(np, skb, ref); | |
666 | err = -EINVAL; | |
667 | goto next; | |
668 | } | |
669 | ||
670 | /* | |
671 | * This definitely indicates a bug, either in this driver or in | |
672 | * the backend driver. In future this should flag the bad | |
673 | * situation to the system controller to reboot the backed. | |
674 | */ | |
675 | if (ref == GRANT_INVALID_REF) { | |
676 | if (net_ratelimit()) | |
677 | dev_warn(dev, "Bad rx response id %d.\n", | |
678 | rx->id); | |
679 | err = -EINVAL; | |
680 | goto next; | |
681 | } | |
682 | ||
683 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
684 | BUG_ON(!ret); | |
685 | ||
686 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
687 | ||
688 | __skb_queue_tail(list, skb); | |
689 | ||
690 | next: | |
f942dc25 | 691 | if (!(rx->flags & XEN_NETRXF_more_data)) |
0d160211 JF |
692 | break; |
693 | ||
694 | if (cons + frags == rp) { | |
695 | if (net_ratelimit()) | |
696 | dev_warn(dev, "Need more frags\n"); | |
697 | err = -ENOENT; | |
698 | break; | |
699 | } | |
700 | ||
701 | rx = RING_GET_RESPONSE(&np->rx, cons + frags); | |
702 | skb = xennet_get_rx_skb(np, cons + frags); | |
703 | ref = xennet_get_rx_ref(np, cons + frags); | |
704 | frags++; | |
705 | } | |
706 | ||
707 | if (unlikely(frags > max)) { | |
708 | if (net_ratelimit()) | |
709 | dev_warn(dev, "Too many frags\n"); | |
710 | err = -E2BIG; | |
711 | } | |
712 | ||
713 | if (unlikely(err)) | |
714 | np->rx.rsp_cons = cons + frags; | |
715 | ||
716 | return err; | |
717 | } | |
718 | ||
719 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
720 | struct xen_netif_extra_info *gso) | |
721 | { | |
722 | if (!gso->u.gso.size) { | |
723 | if (net_ratelimit()) | |
724 | printk(KERN_WARNING "GSO size must not be zero.\n"); | |
725 | return -EINVAL; | |
726 | } | |
727 | ||
728 | /* Currently only TCPv4 S.O. is supported. */ | |
729 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { | |
730 | if (net_ratelimit()) | |
731 | printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); | |
732 | return -EINVAL; | |
733 | } | |
734 | ||
735 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
736 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
737 | ||
738 | /* Header must be checked, and gso_segs computed. */ | |
739 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
740 | skb_shinfo(skb)->gso_segs = 0; | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
745 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | |
746 | struct sk_buff *skb, | |
747 | struct sk_buff_head *list) | |
748 | { | |
749 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
750 | int nr_frags = shinfo->nr_frags; | |
751 | RING_IDX cons = np->rx.rsp_cons; | |
752 | skb_frag_t *frag = shinfo->frags + nr_frags; | |
753 | struct sk_buff *nskb; | |
754 | ||
755 | while ((nskb = __skb_dequeue(list))) { | |
756 | struct xen_netif_rx_response *rx = | |
757 | RING_GET_RESPONSE(&np->rx, ++cons); | |
758 | ||
759 | frag->page = skb_shinfo(nskb)->frags[0].page; | |
760 | frag->page_offset = rx->offset; | |
761 | frag->size = rx->status; | |
762 | ||
763 | skb->data_len += rx->status; | |
764 | ||
765 | skb_shinfo(nskb)->nr_frags = 0; | |
766 | kfree_skb(nskb); | |
767 | ||
768 | frag++; | |
769 | nr_frags++; | |
770 | } | |
771 | ||
772 | shinfo->nr_frags = nr_frags; | |
773 | return cons; | |
774 | } | |
775 | ||
e0ce4af9 | 776 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
0d160211 JF |
777 | { |
778 | struct iphdr *iph; | |
779 | unsigned char *th; | |
780 | int err = -EPROTO; | |
e0ce4af9 IC |
781 | int recalculate_partial_csum = 0; |
782 | ||
783 | /* | |
784 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
785 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
786 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
787 | * recalculate the partial checksum. | |
788 | */ | |
789 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
790 | struct netfront_info *np = netdev_priv(dev); | |
791 | np->rx_gso_checksum_fixup++; | |
792 | skb->ip_summed = CHECKSUM_PARTIAL; | |
793 | recalculate_partial_csum = 1; | |
794 | } | |
795 | ||
796 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
797 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
798 | return 0; | |
0d160211 JF |
799 | |
800 | if (skb->protocol != htons(ETH_P_IP)) | |
801 | goto out; | |
802 | ||
803 | iph = (void *)skb->data; | |
804 | th = skb->data + 4 * iph->ihl; | |
805 | if (th >= skb_tail_pointer(skb)) | |
806 | goto out; | |
807 | ||
808 | skb->csum_start = th - skb->head; | |
809 | switch (iph->protocol) { | |
810 | case IPPROTO_TCP: | |
811 | skb->csum_offset = offsetof(struct tcphdr, check); | |
e0ce4af9 IC |
812 | |
813 | if (recalculate_partial_csum) { | |
814 | struct tcphdr *tcph = (struct tcphdr *)th; | |
815 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
816 | skb->len - iph->ihl*4, | |
817 | IPPROTO_TCP, 0); | |
818 | } | |
0d160211 JF |
819 | break; |
820 | case IPPROTO_UDP: | |
821 | skb->csum_offset = offsetof(struct udphdr, check); | |
e0ce4af9 IC |
822 | |
823 | if (recalculate_partial_csum) { | |
824 | struct udphdr *udph = (struct udphdr *)th; | |
825 | udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
826 | skb->len - iph->ihl*4, | |
827 | IPPROTO_UDP, 0); | |
828 | } | |
0d160211 JF |
829 | break; |
830 | default: | |
831 | if (net_ratelimit()) | |
832 | printk(KERN_ERR "Attempting to checksum a non-" | |
833 | "TCP/UDP packet, dropping a protocol" | |
834 | " %d packet", iph->protocol); | |
835 | goto out; | |
836 | } | |
837 | ||
838 | if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) | |
839 | goto out; | |
840 | ||
841 | err = 0; | |
842 | ||
843 | out: | |
844 | return err; | |
845 | } | |
846 | ||
847 | static int handle_incoming_queue(struct net_device *dev, | |
09f75cd7 | 848 | struct sk_buff_head *rxq) |
0d160211 | 849 | { |
0d160211 JF |
850 | int packets_dropped = 0; |
851 | struct sk_buff *skb; | |
852 | ||
853 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
854 | struct page *page = NETFRONT_SKB_CB(skb)->page; | |
855 | void *vaddr = page_address(page); | |
856 | unsigned offset = NETFRONT_SKB_CB(skb)->offset; | |
857 | ||
858 | memcpy(skb->data, vaddr + offset, | |
859 | skb_headlen(skb)); | |
860 | ||
861 | if (page != skb_shinfo(skb)->frags[0].page) | |
862 | __free_page(page); | |
863 | ||
864 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
865 | skb->protocol = eth_type_trans(skb, dev); | |
866 | ||
e0ce4af9 IC |
867 | if (checksum_setup(dev, skb)) { |
868 | kfree_skb(skb); | |
869 | packets_dropped++; | |
870 | dev->stats.rx_errors++; | |
871 | continue; | |
0d160211 JF |
872 | } |
873 | ||
09f75cd7 JG |
874 | dev->stats.rx_packets++; |
875 | dev->stats.rx_bytes += skb->len; | |
0d160211 JF |
876 | |
877 | /* Pass it up. */ | |
878 | netif_receive_skb(skb); | |
0d160211 JF |
879 | } |
880 | ||
881 | return packets_dropped; | |
882 | } | |
883 | ||
bea3348e | 884 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 885 | { |
bea3348e SH |
886 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
887 | struct net_device *dev = np->netdev; | |
0d160211 JF |
888 | struct sk_buff *skb; |
889 | struct netfront_rx_info rinfo; | |
890 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
891 | struct xen_netif_extra_info *extras = rinfo.extras; | |
892 | RING_IDX i, rp; | |
bea3348e | 893 | int work_done; |
0d160211 JF |
894 | struct sk_buff_head rxq; |
895 | struct sk_buff_head errq; | |
896 | struct sk_buff_head tmpq; | |
897 | unsigned long flags; | |
898 | unsigned int len; | |
899 | int err; | |
900 | ||
901 | spin_lock(&np->rx_lock); | |
902 | ||
0d160211 JF |
903 | skb_queue_head_init(&rxq); |
904 | skb_queue_head_init(&errq); | |
905 | skb_queue_head_init(&tmpq); | |
906 | ||
0d160211 JF |
907 | rp = np->rx.sring->rsp_prod; |
908 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | |
909 | ||
910 | i = np->rx.rsp_cons; | |
911 | work_done = 0; | |
912 | while ((i != rp) && (work_done < budget)) { | |
913 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | |
914 | memset(extras, 0, sizeof(rinfo.extras)); | |
915 | ||
916 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | |
917 | ||
918 | if (unlikely(err)) { | |
919 | err: | |
920 | while ((skb = __skb_dequeue(&tmpq))) | |
921 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 922 | dev->stats.rx_errors++; |
0d160211 JF |
923 | i = np->rx.rsp_cons; |
924 | continue; | |
925 | } | |
926 | ||
927 | skb = __skb_dequeue(&tmpq); | |
928 | ||
929 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
930 | struct xen_netif_extra_info *gso; | |
931 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
932 | ||
933 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
934 | __skb_queue_head(&tmpq, skb); | |
935 | np->rx.rsp_cons += skb_queue_len(&tmpq); | |
936 | goto err; | |
937 | } | |
938 | } | |
939 | ||
940 | NETFRONT_SKB_CB(skb)->page = skb_shinfo(skb)->frags[0].page; | |
941 | NETFRONT_SKB_CB(skb)->offset = rx->offset; | |
942 | ||
943 | len = rx->status; | |
944 | if (len > RX_COPY_THRESHOLD) | |
945 | len = RX_COPY_THRESHOLD; | |
946 | skb_put(skb, len); | |
947 | ||
948 | if (rx->status > len) { | |
949 | skb_shinfo(skb)->frags[0].page_offset = | |
950 | rx->offset + len; | |
951 | skb_shinfo(skb)->frags[0].size = rx->status - len; | |
952 | skb->data_len = rx->status - len; | |
953 | } else { | |
954 | skb_shinfo(skb)->frags[0].page = NULL; | |
955 | skb_shinfo(skb)->nr_frags = 0; | |
956 | } | |
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 - len); | |
984 | skb->len += skb->data_len; | |
985 | ||
f942dc25 | 986 | if (rx->flags & XEN_NETRXF_csum_blank) |
0d160211 | 987 | skb->ip_summed = CHECKSUM_PARTIAL; |
f942dc25 | 988 | else if (rx->flags & XEN_NETRXF_data_validated) |
0d160211 JF |
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 | ||
56cfe5d0 | 997 | __skb_queue_purge(&errq); |
0d160211 JF |
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 | ||
0d160211 | 1010 | if (work_done < budget) { |
bea3348e SH |
1011 | int more_to_do = 0; |
1012 | ||
0d160211 JF |
1013 | local_irq_save(flags); |
1014 | ||
1015 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | |
1016 | if (!more_to_do) | |
288379f0 | 1017 | __napi_complete(napi); |
0d160211 JF |
1018 | |
1019 | local_irq_restore(flags); | |
1020 | } | |
1021 | ||
1022 | spin_unlock(&np->rx_lock); | |
1023 | ||
bea3348e | 1024 | return work_done; |
0d160211 JF |
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 void xennet_release_tx_bufs(struct netfront_info *np) | |
1038 | { | |
1039 | struct sk_buff *skb; | |
1040 | int i; | |
1041 | ||
1042 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1043 | /* Skip over entries which are actually freelist references */ | |
1ffb40b8 | 1044 | if (skb_entry_is_link(&np->tx_skbs[i])) |
0d160211 JF |
1045 | continue; |
1046 | ||
1047 | skb = np->tx_skbs[i].skb; | |
1048 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], | |
1049 | GNTMAP_readonly); | |
1050 | gnttab_release_grant_reference(&np->gref_tx_head, | |
1051 | np->grant_tx_ref[i]); | |
1052 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1053 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | |
1054 | dev_kfree_skb_irq(skb); | |
1055 | } | |
1056 | } | |
1057 | ||
1058 | static void xennet_release_rx_bufs(struct netfront_info *np) | |
1059 | { | |
1060 | struct mmu_update *mmu = np->rx_mmu; | |
1061 | struct multicall_entry *mcl = np->rx_mcl; | |
1062 | struct sk_buff_head free_list; | |
1063 | struct sk_buff *skb; | |
1064 | unsigned long mfn; | |
1065 | int xfer = 0, noxfer = 0, unused = 0; | |
1066 | int id, ref; | |
1067 | ||
1068 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", | |
1069 | __func__); | |
1070 | return; | |
1071 | ||
1072 | skb_queue_head_init(&free_list); | |
1073 | ||
1074 | spin_lock_bh(&np->rx_lock); | |
1075 | ||
1076 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
1077 | ref = np->grant_rx_ref[id]; | |
1078 | if (ref == GRANT_INVALID_REF) { | |
1079 | unused++; | |
1080 | continue; | |
1081 | } | |
1082 | ||
1083 | skb = np->rx_skbs[id]; | |
1084 | mfn = gnttab_end_foreign_transfer_ref(ref); | |
1085 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
1086 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | |
1087 | ||
1088 | if (0 == mfn) { | |
1089 | skb_shinfo(skb)->nr_frags = 0; | |
1090 | dev_kfree_skb(skb); | |
1091 | noxfer++; | |
1092 | continue; | |
1093 | } | |
1094 | ||
1095 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1096 | /* Remap the page. */ | |
1097 | struct page *page = skb_shinfo(skb)->frags[0].page; | |
1098 | unsigned long pfn = page_to_pfn(page); | |
1099 | void *vaddr = page_address(page); | |
1100 | ||
1101 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, | |
1102 | mfn_pte(mfn, PAGE_KERNEL), | |
1103 | 0); | |
1104 | mcl++; | |
1105 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) | |
1106 | | MMU_MACHPHYS_UPDATE; | |
1107 | mmu->val = pfn; | |
1108 | mmu++; | |
1109 | ||
1110 | set_phys_to_machine(pfn, mfn); | |
1111 | } | |
1112 | __skb_queue_tail(&free_list, skb); | |
1113 | xfer++; | |
1114 | } | |
1115 | ||
1116 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", | |
1117 | __func__, xfer, noxfer, unused); | |
1118 | ||
1119 | if (xfer) { | |
1120 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1121 | /* Do all the remapping work and M2P updates. */ | |
1122 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, | |
79ea13ce | 1123 | NULL, DOMID_SELF); |
0d160211 JF |
1124 | mcl++; |
1125 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); | |
1126 | } | |
1127 | } | |
1128 | ||
56cfe5d0 | 1129 | __skb_queue_purge(&free_list); |
0d160211 JF |
1130 | |
1131 | spin_unlock_bh(&np->rx_lock); | |
1132 | } | |
1133 | ||
1134 | static void xennet_uninit(struct net_device *dev) | |
1135 | { | |
1136 | struct netfront_info *np = netdev_priv(dev); | |
1137 | xennet_release_tx_bufs(np); | |
1138 | xennet_release_rx_bufs(np); | |
1139 | gnttab_free_grant_references(np->gref_tx_head); | |
1140 | gnttab_free_grant_references(np->gref_rx_head); | |
1141 | } | |
1142 | ||
0a0b9d2e SH |
1143 | static const struct net_device_ops xennet_netdev_ops = { |
1144 | .ndo_open = xennet_open, | |
1145 | .ndo_uninit = xennet_uninit, | |
1146 | .ndo_stop = xennet_close, | |
1147 | .ndo_start_xmit = xennet_start_xmit, | |
1148 | .ndo_change_mtu = xennet_change_mtu, | |
1149 | .ndo_set_mac_address = eth_mac_addr, | |
1150 | .ndo_validate_addr = eth_validate_addr, | |
1151 | }; | |
1152 | ||
0d160211 JF |
1153 | static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev) |
1154 | { | |
1155 | int i, err; | |
1156 | struct net_device *netdev; | |
1157 | struct netfront_info *np; | |
1158 | ||
1159 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | |
1160 | if (!netdev) { | |
1161 | printk(KERN_WARNING "%s> alloc_etherdev failed.\n", | |
1162 | __func__); | |
1163 | return ERR_PTR(-ENOMEM); | |
1164 | } | |
1165 | ||
1166 | np = netdev_priv(netdev); | |
1167 | np->xbdev = dev; | |
1168 | ||
1169 | spin_lock_init(&np->tx_lock); | |
1170 | spin_lock_init(&np->rx_lock); | |
1171 | ||
1172 | skb_queue_head_init(&np->rx_batch); | |
1173 | np->rx_target = RX_DFL_MIN_TARGET; | |
1174 | np->rx_min_target = RX_DFL_MIN_TARGET; | |
1175 | np->rx_max_target = RX_MAX_TARGET; | |
1176 | ||
1177 | init_timer(&np->rx_refill_timer); | |
1178 | np->rx_refill_timer.data = (unsigned long)netdev; | |
1179 | np->rx_refill_timer.function = rx_refill_timeout; | |
1180 | ||
1181 | /* Initialise tx_skbs as a free chain containing every entry. */ | |
1182 | np->tx_skb_freelist = 0; | |
1183 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1ffb40b8 | 1184 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
0d160211 JF |
1185 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1186 | } | |
1187 | ||
1188 | /* Clear out rx_skbs */ | |
1189 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1190 | np->rx_skbs[i] = NULL; | |
1191 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1192 | } | |
1193 | ||
1194 | /* A grant for every tx ring slot */ | |
1195 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | |
1196 | &np->gref_tx_head) < 0) { | |
1197 | printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); | |
1198 | err = -ENOMEM; | |
1199 | goto exit; | |
1200 | } | |
1201 | /* A grant for every rx ring slot */ | |
1202 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | |
1203 | &np->gref_rx_head) < 0) { | |
1204 | printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); | |
1205 | err = -ENOMEM; | |
1206 | goto exit_free_tx; | |
1207 | } | |
1208 | ||
0a0b9d2e SH |
1209 | netdev->netdev_ops = &xennet_netdev_ops; |
1210 | ||
bea3348e | 1211 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
0d160211 JF |
1212 | netdev->features = NETIF_F_IP_CSUM; |
1213 | ||
1214 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); | |
0d160211 JF |
1215 | SET_NETDEV_DEV(netdev, &dev->dev); |
1216 | ||
1217 | np->netdev = netdev; | |
1218 | ||
1219 | netif_carrier_off(netdev); | |
1220 | ||
1221 | return netdev; | |
1222 | ||
1223 | exit_free_tx: | |
1224 | gnttab_free_grant_references(np->gref_tx_head); | |
1225 | exit: | |
1226 | free_netdev(netdev); | |
1227 | return ERR_PTR(err); | |
1228 | } | |
1229 | ||
1230 | /** | |
1231 | * Entry point to this code when a new device is created. Allocate the basic | |
1232 | * structures and the ring buffers for communication with the backend, and | |
1233 | * inform the backend of the appropriate details for those. | |
1234 | */ | |
1235 | static int __devinit netfront_probe(struct xenbus_device *dev, | |
1236 | const struct xenbus_device_id *id) | |
1237 | { | |
1238 | int err; | |
1239 | struct net_device *netdev; | |
1240 | struct netfront_info *info; | |
1241 | ||
1242 | netdev = xennet_create_dev(dev); | |
1243 | if (IS_ERR(netdev)) { | |
1244 | err = PTR_ERR(netdev); | |
1245 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1246 | return err; | |
1247 | } | |
1248 | ||
1249 | info = netdev_priv(netdev); | |
1b713e00 | 1250 | dev_set_drvdata(&dev->dev, info); |
0d160211 JF |
1251 | |
1252 | err = register_netdev(info->netdev); | |
1253 | if (err) { | |
1254 | printk(KERN_WARNING "%s: register_netdev err=%d\n", | |
1255 | __func__, err); | |
1256 | goto fail; | |
1257 | } | |
1258 | ||
1259 | err = xennet_sysfs_addif(info->netdev); | |
1260 | if (err) { | |
1261 | unregister_netdev(info->netdev); | |
1262 | printk(KERN_WARNING "%s: add sysfs failed err=%d\n", | |
1263 | __func__, err); | |
1264 | goto fail; | |
1265 | } | |
1266 | ||
1267 | return 0; | |
1268 | ||
1269 | fail: | |
1270 | free_netdev(netdev); | |
1b713e00 | 1271 | dev_set_drvdata(&dev->dev, NULL); |
0d160211 JF |
1272 | return err; |
1273 | } | |
1274 | ||
1275 | static void xennet_end_access(int ref, void *page) | |
1276 | { | |
1277 | /* This frees the page as a side-effect */ | |
1278 | if (ref != GRANT_INVALID_REF) | |
1279 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1280 | } | |
1281 | ||
1282 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1283 | { | |
1284 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | |
1285 | spin_lock_bh(&info->rx_lock); | |
1286 | spin_lock_irq(&info->tx_lock); | |
1287 | netif_carrier_off(info->netdev); | |
1288 | spin_unlock_irq(&info->tx_lock); | |
1289 | spin_unlock_bh(&info->rx_lock); | |
1290 | ||
1291 | if (info->netdev->irq) | |
1292 | unbind_from_irqhandler(info->netdev->irq, info->netdev); | |
1293 | info->evtchn = info->netdev->irq = 0; | |
1294 | ||
1295 | /* End access and free the pages */ | |
1296 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | |
1297 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | |
1298 | ||
1299 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1300 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1301 | info->tx.sring = NULL; | |
1302 | info->rx.sring = NULL; | |
1303 | } | |
1304 | ||
1305 | /** | |
1306 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1307 | * driver restart. We tear down our netif structure and recreate it, but | |
1308 | * leave the device-layer structures intact so that this is transparent to the | |
1309 | * rest of the kernel. | |
1310 | */ | |
1311 | static int netfront_resume(struct xenbus_device *dev) | |
1312 | { | |
1b713e00 | 1313 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1314 | |
1315 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1316 | ||
1317 | xennet_disconnect_backend(info); | |
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1322 | { | |
1323 | char *s, *e, *macstr; | |
1324 | int i; | |
1325 | ||
1326 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1327 | if (IS_ERR(macstr)) | |
1328 | return PTR_ERR(macstr); | |
1329 | ||
1330 | for (i = 0; i < ETH_ALEN; i++) { | |
1331 | mac[i] = simple_strtoul(s, &e, 16); | |
1332 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1333 | kfree(macstr); | |
1334 | return -ENOENT; | |
1335 | } | |
1336 | s = e+1; | |
1337 | } | |
1338 | ||
1339 | kfree(macstr); | |
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) | |
1344 | { | |
1345 | struct net_device *dev = dev_id; | |
1346 | struct netfront_info *np = netdev_priv(dev); | |
1347 | unsigned long flags; | |
1348 | ||
1349 | spin_lock_irqsave(&np->tx_lock, flags); | |
1350 | ||
1351 | if (likely(netif_carrier_ok(dev))) { | |
1352 | xennet_tx_buf_gc(dev); | |
1353 | /* Under tx_lock: protects access to rx shared-ring indexes. */ | |
1354 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
288379f0 | 1355 | napi_schedule(&np->napi); |
0d160211 JF |
1356 | } |
1357 | ||
1358 | spin_unlock_irqrestore(&np->tx_lock, flags); | |
1359 | ||
1360 | return IRQ_HANDLED; | |
1361 | } | |
1362 | ||
1363 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) | |
1364 | { | |
1365 | struct xen_netif_tx_sring *txs; | |
1366 | struct xen_netif_rx_sring *rxs; | |
1367 | int err; | |
1368 | struct net_device *netdev = info->netdev; | |
1369 | ||
1370 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1371 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1372 | info->rx.sring = NULL; | |
1373 | info->tx.sring = NULL; | |
1374 | netdev->irq = 0; | |
1375 | ||
1376 | err = xen_net_read_mac(dev, netdev->dev_addr); | |
1377 | if (err) { | |
1378 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1379 | goto fail; | |
1380 | } | |
1381 | ||
a144ff09 | 1382 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1383 | if (!txs) { |
1384 | err = -ENOMEM; | |
1385 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1386 | goto fail; | |
1387 | } | |
1388 | SHARED_RING_INIT(txs); | |
1389 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | |
1390 | ||
1391 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | |
1392 | if (err < 0) { | |
1393 | free_page((unsigned long)txs); | |
1394 | goto fail; | |
1395 | } | |
1396 | ||
1397 | info->tx_ring_ref = err; | |
a144ff09 | 1398 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1399 | if (!rxs) { |
1400 | err = -ENOMEM; | |
1401 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1402 | goto fail; | |
1403 | } | |
1404 | SHARED_RING_INIT(rxs); | |
1405 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | |
1406 | ||
1407 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | |
1408 | if (err < 0) { | |
1409 | free_page((unsigned long)rxs); | |
1410 | goto fail; | |
1411 | } | |
1412 | info->rx_ring_ref = err; | |
1413 | ||
1414 | err = xenbus_alloc_evtchn(dev, &info->evtchn); | |
1415 | if (err) | |
1416 | goto fail; | |
1417 | ||
1418 | err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, | |
1419 | IRQF_SAMPLE_RANDOM, netdev->name, | |
1420 | netdev); | |
1421 | if (err < 0) | |
1422 | goto fail; | |
1423 | netdev->irq = err; | |
1424 | return 0; | |
1425 | ||
1426 | fail: | |
1427 | return err; | |
1428 | } | |
1429 | ||
1430 | /* Common code used when first setting up, and when resuming. */ | |
f502bf2b | 1431 | static int talk_to_netback(struct xenbus_device *dev, |
0d160211 JF |
1432 | struct netfront_info *info) |
1433 | { | |
1434 | const char *message; | |
1435 | struct xenbus_transaction xbt; | |
1436 | int err; | |
1437 | ||
1438 | /* Create shared ring, alloc event channel. */ | |
1439 | err = setup_netfront(dev, info); | |
1440 | if (err) | |
1441 | goto out; | |
1442 | ||
1443 | again: | |
1444 | err = xenbus_transaction_start(&xbt); | |
1445 | if (err) { | |
1446 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1447 | goto destroy_ring; | |
1448 | } | |
1449 | ||
1450 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | |
1451 | info->tx_ring_ref); | |
1452 | if (err) { | |
1453 | message = "writing tx ring-ref"; | |
1454 | goto abort_transaction; | |
1455 | } | |
1456 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | |
1457 | info->rx_ring_ref); | |
1458 | if (err) { | |
1459 | message = "writing rx ring-ref"; | |
1460 | goto abort_transaction; | |
1461 | } | |
1462 | err = xenbus_printf(xbt, dev->nodename, | |
1463 | "event-channel", "%u", info->evtchn); | |
1464 | if (err) { | |
1465 | message = "writing event-channel"; | |
1466 | goto abort_transaction; | |
1467 | } | |
1468 | ||
1469 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | |
1470 | 1); | |
1471 | if (err) { | |
1472 | message = "writing request-rx-copy"; | |
1473 | goto abort_transaction; | |
1474 | } | |
1475 | ||
1476 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1477 | if (err) { | |
1478 | message = "writing feature-rx-notify"; | |
1479 | goto abort_transaction; | |
1480 | } | |
1481 | ||
1482 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1483 | if (err) { | |
1484 | message = "writing feature-sg"; | |
1485 | goto abort_transaction; | |
1486 | } | |
1487 | ||
1488 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1489 | if (err) { | |
1490 | message = "writing feature-gso-tcpv4"; | |
1491 | goto abort_transaction; | |
1492 | } | |
1493 | ||
1494 | err = xenbus_transaction_end(xbt, 0); | |
1495 | if (err) { | |
1496 | if (err == -EAGAIN) | |
1497 | goto again; | |
1498 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1499 | goto destroy_ring; | |
1500 | } | |
1501 | ||
1502 | return 0; | |
1503 | ||
1504 | abort_transaction: | |
1505 | xenbus_transaction_end(xbt, 1); | |
1506 | xenbus_dev_fatal(dev, err, "%s", message); | |
1507 | destroy_ring: | |
1508 | xennet_disconnect_backend(info); | |
1509 | out: | |
1510 | return err; | |
1511 | } | |
1512 | ||
1513 | static int xennet_set_sg(struct net_device *dev, u32 data) | |
1514 | { | |
1515 | if (data) { | |
1516 | struct netfront_info *np = netdev_priv(dev); | |
1517 | int val; | |
1518 | ||
1519 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | |
1520 | "%d", &val) < 0) | |
1521 | val = 0; | |
1522 | if (!val) | |
1523 | return -ENOSYS; | |
1524 | } else if (dev->mtu > ETH_DATA_LEN) | |
1525 | dev->mtu = ETH_DATA_LEN; | |
1526 | ||
1527 | return ethtool_op_set_sg(dev, data); | |
1528 | } | |
1529 | ||
1530 | static int xennet_set_tso(struct net_device *dev, u32 data) | |
1531 | { | |
1532 | if (data) { | |
1533 | struct netfront_info *np = netdev_priv(dev); | |
1534 | int val; | |
1535 | ||
1536 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1537 | "feature-gso-tcpv4", "%d", &val) < 0) | |
1538 | val = 0; | |
1539 | if (!val) | |
1540 | return -ENOSYS; | |
1541 | } | |
1542 | ||
1543 | return ethtool_op_set_tso(dev, data); | |
1544 | } | |
1545 | ||
1546 | static void xennet_set_features(struct net_device *dev) | |
1547 | { | |
1548 | /* Turn off all GSO bits except ROBUST. */ | |
43eb99c5 | 1549 | dev->features &= ~NETIF_F_GSO_MASK; |
0d160211 JF |
1550 | dev->features |= NETIF_F_GSO_ROBUST; |
1551 | xennet_set_sg(dev, 0); | |
1552 | ||
1553 | /* We need checksum offload to enable scatter/gather and TSO. */ | |
1554 | if (!(dev->features & NETIF_F_IP_CSUM)) | |
1555 | return; | |
1556 | ||
1557 | if (!xennet_set_sg(dev, 1)) | |
1558 | xennet_set_tso(dev, 1); | |
1559 | } | |
1560 | ||
1561 | static int xennet_connect(struct net_device *dev) | |
1562 | { | |
1563 | struct netfront_info *np = netdev_priv(dev); | |
1564 | int i, requeue_idx, err; | |
1565 | struct sk_buff *skb; | |
1566 | grant_ref_t ref; | |
1567 | struct xen_netif_rx_request *req; | |
1568 | unsigned int feature_rx_copy; | |
1569 | ||
1570 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1571 | "feature-rx-copy", "%u", &feature_rx_copy); | |
1572 | if (err != 1) | |
1573 | feature_rx_copy = 0; | |
1574 | ||
1575 | if (!feature_rx_copy) { | |
1576 | dev_info(&dev->dev, | |
898eb71c | 1577 | "backend does not support copying receive path\n"); |
0d160211 JF |
1578 | return -ENODEV; |
1579 | } | |
1580 | ||
f502bf2b | 1581 | err = talk_to_netback(np->xbdev, np); |
0d160211 JF |
1582 | if (err) |
1583 | return err; | |
1584 | ||
1585 | xennet_set_features(dev); | |
1586 | ||
1587 | spin_lock_bh(&np->rx_lock); | |
1588 | spin_lock_irq(&np->tx_lock); | |
1589 | ||
1590 | /* Step 1: Discard all pending TX packet fragments. */ | |
1591 | xennet_release_tx_bufs(np); | |
1592 | ||
1593 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | |
1594 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | |
1595 | if (!np->rx_skbs[i]) | |
1596 | continue; | |
1597 | ||
1598 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | |
1599 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | |
1600 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | |
1601 | ||
1602 | gnttab_grant_foreign_access_ref( | |
1603 | ref, np->xbdev->otherend_id, | |
1604 | pfn_to_mfn(page_to_pfn(skb_shinfo(skb)-> | |
1605 | frags->page)), | |
1606 | 0); | |
1607 | req->gref = ref; | |
1608 | req->id = requeue_idx; | |
1609 | ||
1610 | requeue_idx++; | |
1611 | } | |
1612 | ||
1613 | np->rx.req_prod_pvt = requeue_idx; | |
1614 | ||
1615 | /* | |
1616 | * Step 3: All public and private state should now be sane. Get | |
1617 | * ready to start sending and receiving packets and give the driver | |
1618 | * domain a kick because we've probably just requeued some | |
1619 | * packets. | |
1620 | */ | |
1621 | netif_carrier_on(np->netdev); | |
1622 | notify_remote_via_irq(np->netdev->irq); | |
1623 | xennet_tx_buf_gc(dev); | |
1624 | xennet_alloc_rx_buffers(dev); | |
1625 | ||
1626 | spin_unlock_irq(&np->tx_lock); | |
1627 | spin_unlock_bh(&np->rx_lock); | |
1628 | ||
1629 | return 0; | |
1630 | } | |
1631 | ||
1632 | /** | |
1633 | * Callback received when the backend's state changes. | |
1634 | */ | |
f502bf2b | 1635 | static void netback_changed(struct xenbus_device *dev, |
0d160211 JF |
1636 | enum xenbus_state backend_state) |
1637 | { | |
1b713e00 | 1638 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1639 | struct net_device *netdev = np->netdev; |
1640 | ||
1641 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
1642 | ||
1643 | switch (backend_state) { | |
1644 | case XenbusStateInitialising: | |
1645 | case XenbusStateInitialised: | |
b78c9512 NI |
1646 | case XenbusStateReconfiguring: |
1647 | case XenbusStateReconfigured: | |
0d160211 JF |
1648 | case XenbusStateConnected: |
1649 | case XenbusStateUnknown: | |
1650 | case XenbusStateClosed: | |
1651 | break; | |
1652 | ||
1653 | case XenbusStateInitWait: | |
1654 | if (dev->state != XenbusStateInitialising) | |
1655 | break; | |
1656 | if (xennet_connect(netdev) != 0) | |
1657 | break; | |
1658 | xenbus_switch_state(dev, XenbusStateConnected); | |
59297067 | 1659 | netif_notify_peers(netdev); |
0d160211 JF |
1660 | break; |
1661 | ||
1662 | case XenbusStateClosing: | |
1663 | xenbus_frontend_closed(dev); | |
1664 | break; | |
1665 | } | |
1666 | } | |
1667 | ||
e0ce4af9 IC |
1668 | static const struct xennet_stat { |
1669 | char name[ETH_GSTRING_LEN]; | |
1670 | u16 offset; | |
1671 | } xennet_stats[] = { | |
1672 | { | |
1673 | "rx_gso_checksum_fixup", | |
1674 | offsetof(struct netfront_info, rx_gso_checksum_fixup) | |
1675 | }, | |
1676 | }; | |
1677 | ||
1678 | static int xennet_get_sset_count(struct net_device *dev, int string_set) | |
1679 | { | |
1680 | switch (string_set) { | |
1681 | case ETH_SS_STATS: | |
1682 | return ARRAY_SIZE(xennet_stats); | |
1683 | default: | |
1684 | return -EINVAL; | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | static void xennet_get_ethtool_stats(struct net_device *dev, | |
1689 | struct ethtool_stats *stats, u64 * data) | |
1690 | { | |
1691 | void *np = netdev_priv(dev); | |
1692 | int i; | |
1693 | ||
1694 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
48f26d51 | 1695 | data[i] = *(unsigned long *)(np + xennet_stats[i].offset); |
e0ce4af9 IC |
1696 | } |
1697 | ||
1698 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
1699 | { | |
1700 | int i; | |
1701 | ||
1702 | switch (stringset) { | |
1703 | case ETH_SS_STATS: | |
1704 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
1705 | memcpy(data + i * ETH_GSTRING_LEN, | |
1706 | xennet_stats[i].name, ETH_GSTRING_LEN); | |
1707 | break; | |
1708 | } | |
1709 | } | |
1710 | ||
0fc0b732 | 1711 | static const struct ethtool_ops xennet_ethtool_ops = |
0d160211 | 1712 | { |
0d160211 | 1713 | .set_tx_csum = ethtool_op_set_tx_csum, |
0d160211 | 1714 | .set_sg = xennet_set_sg, |
0d160211 JF |
1715 | .set_tso = xennet_set_tso, |
1716 | .get_link = ethtool_op_get_link, | |
e0ce4af9 IC |
1717 | |
1718 | .get_sset_count = xennet_get_sset_count, | |
1719 | .get_ethtool_stats = xennet_get_ethtool_stats, | |
1720 | .get_strings = xennet_get_strings, | |
0d160211 JF |
1721 | }; |
1722 | ||
1723 | #ifdef CONFIG_SYSFS | |
1724 | static ssize_t show_rxbuf_min(struct device *dev, | |
1725 | struct device_attribute *attr, char *buf) | |
1726 | { | |
1727 | struct net_device *netdev = to_net_dev(dev); | |
1728 | struct netfront_info *info = netdev_priv(netdev); | |
1729 | ||
1730 | return sprintf(buf, "%u\n", info->rx_min_target); | |
1731 | } | |
1732 | ||
1733 | static ssize_t store_rxbuf_min(struct device *dev, | |
1734 | struct device_attribute *attr, | |
1735 | const char *buf, size_t len) | |
1736 | { | |
1737 | struct net_device *netdev = to_net_dev(dev); | |
1738 | struct netfront_info *np = netdev_priv(netdev); | |
1739 | char *endp; | |
1740 | unsigned long target; | |
1741 | ||
1742 | if (!capable(CAP_NET_ADMIN)) | |
1743 | return -EPERM; | |
1744 | ||
1745 | target = simple_strtoul(buf, &endp, 0); | |
1746 | if (endp == buf) | |
1747 | return -EBADMSG; | |
1748 | ||
1749 | if (target < RX_MIN_TARGET) | |
1750 | target = RX_MIN_TARGET; | |
1751 | if (target > RX_MAX_TARGET) | |
1752 | target = RX_MAX_TARGET; | |
1753 | ||
1754 | spin_lock_bh(&np->rx_lock); | |
1755 | if (target > np->rx_max_target) | |
1756 | np->rx_max_target = target; | |
1757 | np->rx_min_target = target; | |
1758 | if (target > np->rx_target) | |
1759 | np->rx_target = target; | |
1760 | ||
1761 | xennet_alloc_rx_buffers(netdev); | |
1762 | ||
1763 | spin_unlock_bh(&np->rx_lock); | |
1764 | return len; | |
1765 | } | |
1766 | ||
1767 | static ssize_t show_rxbuf_max(struct device *dev, | |
1768 | struct device_attribute *attr, char *buf) | |
1769 | { | |
1770 | struct net_device *netdev = to_net_dev(dev); | |
1771 | struct netfront_info *info = netdev_priv(netdev); | |
1772 | ||
1773 | return sprintf(buf, "%u\n", info->rx_max_target); | |
1774 | } | |
1775 | ||
1776 | static ssize_t store_rxbuf_max(struct device *dev, | |
1777 | struct device_attribute *attr, | |
1778 | const char *buf, size_t len) | |
1779 | { | |
1780 | struct net_device *netdev = to_net_dev(dev); | |
1781 | struct netfront_info *np = netdev_priv(netdev); | |
1782 | char *endp; | |
1783 | unsigned long target; | |
1784 | ||
1785 | if (!capable(CAP_NET_ADMIN)) | |
1786 | return -EPERM; | |
1787 | ||
1788 | target = simple_strtoul(buf, &endp, 0); | |
1789 | if (endp == buf) | |
1790 | return -EBADMSG; | |
1791 | ||
1792 | if (target < RX_MIN_TARGET) | |
1793 | target = RX_MIN_TARGET; | |
1794 | if (target > RX_MAX_TARGET) | |
1795 | target = RX_MAX_TARGET; | |
1796 | ||
1797 | spin_lock_bh(&np->rx_lock); | |
1798 | if (target < np->rx_min_target) | |
1799 | np->rx_min_target = target; | |
1800 | np->rx_max_target = target; | |
1801 | if (target < np->rx_target) | |
1802 | np->rx_target = target; | |
1803 | ||
1804 | xennet_alloc_rx_buffers(netdev); | |
1805 | ||
1806 | spin_unlock_bh(&np->rx_lock); | |
1807 | return len; | |
1808 | } | |
1809 | ||
1810 | static ssize_t show_rxbuf_cur(struct device *dev, | |
1811 | struct device_attribute *attr, char *buf) | |
1812 | { | |
1813 | struct net_device *netdev = to_net_dev(dev); | |
1814 | struct netfront_info *info = netdev_priv(netdev); | |
1815 | ||
1816 | return sprintf(buf, "%u\n", info->rx_target); | |
1817 | } | |
1818 | ||
1819 | static struct device_attribute xennet_attrs[] = { | |
1820 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | |
1821 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | |
1822 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | |
1823 | }; | |
1824 | ||
1825 | static int xennet_sysfs_addif(struct net_device *netdev) | |
1826 | { | |
1827 | int i; | |
1828 | int err; | |
1829 | ||
1830 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | |
1831 | err = device_create_file(&netdev->dev, | |
1832 | &xennet_attrs[i]); | |
1833 | if (err) | |
1834 | goto fail; | |
1835 | } | |
1836 | return 0; | |
1837 | ||
1838 | fail: | |
1839 | while (--i >= 0) | |
1840 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1841 | return err; | |
1842 | } | |
1843 | ||
1844 | static void xennet_sysfs_delif(struct net_device *netdev) | |
1845 | { | |
1846 | int i; | |
1847 | ||
1848 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | |
1849 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1850 | } | |
1851 | ||
1852 | #endif /* CONFIG_SYSFS */ | |
1853 | ||
1854 | static struct xenbus_device_id netfront_ids[] = { | |
1855 | { "vif" }, | |
1856 | { "" } | |
1857 | }; | |
1858 | ||
1859 | ||
1860 | static int __devexit xennet_remove(struct xenbus_device *dev) | |
1861 | { | |
1b713e00 | 1862 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1863 | |
1864 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1865 | ||
1866 | unregister_netdev(info->netdev); | |
1867 | ||
1868 | xennet_disconnect_backend(info); | |
1869 | ||
1870 | del_timer_sync(&info->rx_refill_timer); | |
1871 | ||
1872 | xennet_sysfs_delif(info->netdev); | |
1873 | ||
1874 | free_netdev(info->netdev); | |
1875 | ||
1876 | return 0; | |
1877 | } | |
1878 | ||
ffb78a26 | 1879 | static struct xenbus_driver netfront_driver = { |
0d160211 JF |
1880 | .name = "vif", |
1881 | .owner = THIS_MODULE, | |
1882 | .ids = netfront_ids, | |
1883 | .probe = netfront_probe, | |
1884 | .remove = __devexit_p(xennet_remove), | |
1885 | .resume = netfront_resume, | |
f502bf2b | 1886 | .otherend_changed = netback_changed, |
0d160211 JF |
1887 | }; |
1888 | ||
1889 | static int __init netif_init(void) | |
1890 | { | |
6e833587 | 1891 | if (!xen_domain()) |
0d160211 JF |
1892 | return -ENODEV; |
1893 | ||
6e833587 | 1894 | if (xen_initial_domain()) |
0d160211 JF |
1895 | return 0; |
1896 | ||
1897 | printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); | |
1898 | ||
ffb78a26 | 1899 | return xenbus_register_frontend(&netfront_driver); |
0d160211 JF |
1900 | } |
1901 | module_init(netif_init); | |
1902 | ||
1903 | ||
1904 | static void __exit netif_exit(void) | |
1905 | { | |
6e833587 | 1906 | if (xen_initial_domain()) |
0d160211 JF |
1907 | return; |
1908 | ||
ffb78a26 | 1909 | xenbus_unregister_driver(&netfront_driver); |
0d160211 JF |
1910 | } |
1911 | module_exit(netif_exit); | |
1912 | ||
1913 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
1914 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 1915 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 1916 | MODULE_ALIAS("xennet"); |