diff options
author | Jeremy Fitzhardinge <jeremy@xensource.com> | 2007-07-17 21:37:06 -0400 |
---|---|---|
committer | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-07-18 11:47:45 -0400 |
commit | 0d160211965b79de989cf2d170985abeb8da5ec6 (patch) | |
tree | 968bc01a0e7fe75b6e274d8958b04fc1d9afa3a7 /drivers/net/xen-netfront.c | |
parent | 9f27ee595038653ddf8bca871200d39247d6f4fc (diff) |
xen: add virtual network device driver
The network device frontend driver allows the kernel to access network
devices exported exported by a virtual machine containing a physical
network device driver.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Acked-by: Jeff Garzik <jeff@garzik.org>
Cc: Ian Pratt <ian.pratt@xensource.com>
Cc: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: netdev@vger.kernel.org
Diffstat (limited to 'drivers/net/xen-netfront.c')
-rw-r--r-- | drivers/net/xen-netfront.c | 1863 |
1 files changed, 1863 insertions, 0 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c new file mode 100644 index 000000000000..489f69c5d6ca --- /dev/null +++ b/drivers/net/xen-netfront.c | |||
@@ -0,0 +1,1863 @@ | |||
1 | /* | ||
2 | * Virtual network driver for conversing with remote driver backends. | ||
3 | * | ||
4 | * Copyright (c) 2002-2005, K A Fraser | ||
5 | * Copyright (c) 2005, XenSource Ltd | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or | ||
8 | * modify it under the terms of the GNU General Public License version 2 | ||
9 | * as published by the Free Software Foundation; or, when distributed | ||
10 | * separately from the Linux kernel or incorporated into other | ||
11 | * software packages, subject to the following license: | ||
12 | * | ||
13 | * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
14 | * of this source file (the "Software"), to deal in the Software without | ||
15 | * restriction, including without limitation the rights to use, copy, modify, | ||
16 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | ||
17 | * and to permit persons to whom the Software is furnished to do so, subject to | ||
18 | * the following conditions: | ||
19 | * | ||
20 | * The above copyright notice and this permission notice shall be included in | ||
21 | * all copies or substantial portions of the Software. | ||
22 | * | ||
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | ||
29 | * IN THE SOFTWARE. | ||
30 | */ | ||
31 | |||
32 | #include <linux/module.h> | ||
33 | #include <linux/kernel.h> | ||
34 | #include <linux/netdevice.h> | ||
35 | #include <linux/etherdevice.h> | ||
36 | #include <linux/skbuff.h> | ||
37 | #include <linux/ethtool.h> | ||
38 | #include <linux/if_ether.h> | ||
39 | #include <linux/tcp.h> | ||
40 | #include <linux/udp.h> | ||
41 | #include <linux/moduleparam.h> | ||
42 | #include <linux/mm.h> | ||
43 | #include <net/ip.h> | ||
44 | |||
45 | #include <xen/xenbus.h> | ||
46 | #include <xen/events.h> | ||
47 | #include <xen/page.h> | ||
48 | #include <xen/grant_table.h> | ||
49 | |||
50 | #include <xen/interface/io/netif.h> | ||
51 | #include <xen/interface/memory.h> | ||
52 | #include <xen/interface/grant_table.h> | ||
53 | |||
54 | static struct ethtool_ops xennet_ethtool_ops; | ||
55 | |||
56 | struct netfront_cb { | ||
57 | struct page *page; | ||
58 | unsigned offset; | ||
59 | }; | ||
60 | |||
61 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) | ||
62 | |||
63 | #define RX_COPY_THRESHOLD 256 | ||
64 | |||
65 | #define GRANT_INVALID_REF 0 | ||
66 | |||
67 | #define NET_TX_RING_SIZE __RING_SIZE((struct xen_netif_tx_sring *)0, PAGE_SIZE) | ||
68 | #define NET_RX_RING_SIZE __RING_SIZE((struct xen_netif_rx_sring *)0, PAGE_SIZE) | ||
69 | #define TX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | ||
70 | |||
71 | struct netfront_info { | ||
72 | struct list_head list; | ||
73 | struct net_device *netdev; | ||
74 | |||
75 | struct net_device_stats stats; | ||
76 | |||
77 | struct xen_netif_tx_front_ring tx; | ||
78 | struct xen_netif_rx_front_ring rx; | ||
79 | |||
80 | spinlock_t tx_lock; | ||
81 | spinlock_t rx_lock; | ||
82 | |||
83 | unsigned int evtchn; | ||
84 | |||
85 | /* Receive-ring batched refills. */ | ||
86 | #define RX_MIN_TARGET 8 | ||
87 | #define RX_DFL_MIN_TARGET 64 | ||
88 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | ||
89 | unsigned rx_min_target, rx_max_target, rx_target; | ||
90 | struct sk_buff_head rx_batch; | ||
91 | |||
92 | struct timer_list rx_refill_timer; | ||
93 | |||
94 | /* | ||
95 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries | ||
96 | * are linked from tx_skb_freelist through skb_entry.link. | ||
97 | * | ||
98 | * NB. Freelist index entries are always going to be less than | ||
99 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or | ||
100 | * greater than PAGE_OFFSET: we use this property to distinguish | ||
101 | * them. | ||
102 | */ | ||
103 | union skb_entry { | ||
104 | struct sk_buff *skb; | ||
105 | unsigned link; | ||
106 | } tx_skbs[NET_TX_RING_SIZE]; | ||
107 | grant_ref_t gref_tx_head; | ||
108 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | ||
109 | unsigned tx_skb_freelist; | ||
110 | |||
111 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; | ||
112 | grant_ref_t gref_rx_head; | ||
113 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; | ||
114 | |||
115 | struct xenbus_device *xbdev; | ||
116 | int tx_ring_ref; | ||
117 | int rx_ring_ref; | ||
118 | |||
119 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; | ||
120 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; | ||
121 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; | ||
122 | }; | ||
123 | |||
124 | struct netfront_rx_info { | ||
125 | struct xen_netif_rx_response rx; | ||
126 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; | ||
127 | }; | ||
128 | |||
129 | /* | ||
130 | * Access macros for acquiring freeing slots in tx_skbs[]. | ||
131 | */ | ||
132 | |||
133 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, | ||
134 | unsigned short id) | ||
135 | { | ||
136 | list[id].link = *head; | ||
137 | *head = id; | ||
138 | } | ||
139 | |||
140 | static unsigned short get_id_from_freelist(unsigned *head, | ||
141 | union skb_entry *list) | ||
142 | { | ||
143 | unsigned int id = *head; | ||
144 | *head = list[id].link; | ||
145 | return id; | ||
146 | } | ||
147 | |||
148 | static int xennet_rxidx(RING_IDX idx) | ||
149 | { | ||
150 | return idx & (NET_RX_RING_SIZE - 1); | ||
151 | } | ||
152 | |||
153 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, | ||
154 | RING_IDX ri) | ||
155 | { | ||
156 | int i = xennet_rxidx(ri); | ||
157 | struct sk_buff *skb = np->rx_skbs[i]; | ||
158 | np->rx_skbs[i] = NULL; | ||
159 | return skb; | ||
160 | } | ||
161 | |||
162 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, | ||
163 | RING_IDX ri) | ||
164 | { | ||
165 | int i = xennet_rxidx(ri); | ||
166 | grant_ref_t ref = np->grant_rx_ref[i]; | ||
167 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | ||
168 | return ref; | ||
169 | } | ||
170 | |||
171 | #ifdef CONFIG_SYSFS | ||
172 | static int xennet_sysfs_addif(struct net_device *netdev); | ||
173 | static void xennet_sysfs_delif(struct net_device *netdev); | ||
174 | #else /* !CONFIG_SYSFS */ | ||
175 | #define xennet_sysfs_addif(dev) (0) | ||
176 | #define xennet_sysfs_delif(dev) do { } while (0) | ||
177 | #endif | ||
178 | |||
179 | static int xennet_can_sg(struct net_device *dev) | ||
180 | { | ||
181 | return dev->features & NETIF_F_SG; | ||
182 | } | ||
183 | |||
184 | |||
185 | static void rx_refill_timeout(unsigned long data) | ||
186 | { | ||
187 | struct net_device *dev = (struct net_device *)data; | ||
188 | netif_rx_schedule(dev); | ||
189 | } | ||
190 | |||
191 | static int netfront_tx_slot_available(struct netfront_info *np) | ||
192 | { | ||
193 | return ((np->tx.req_prod_pvt - np->tx.rsp_cons) < | ||
194 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2)); | ||
195 | } | ||
196 | |||
197 | static void xennet_maybe_wake_tx(struct net_device *dev) | ||
198 | { | ||
199 | struct netfront_info *np = netdev_priv(dev); | ||
200 | |||
201 | if (unlikely(netif_queue_stopped(dev)) && | ||
202 | netfront_tx_slot_available(np) && | ||
203 | likely(netif_running(dev))) | ||
204 | netif_wake_queue(dev); | ||
205 | } | ||
206 | |||
207 | static void xennet_alloc_rx_buffers(struct net_device *dev) | ||
208 | { | ||
209 | unsigned short id; | ||
210 | struct netfront_info *np = netdev_priv(dev); | ||
211 | struct sk_buff *skb; | ||
212 | struct page *page; | ||
213 | int i, batch_target, notify; | ||
214 | RING_IDX req_prod = np->rx.req_prod_pvt; | ||
215 | struct xen_memory_reservation reservation; | ||
216 | grant_ref_t ref; | ||
217 | unsigned long pfn; | ||
218 | void *vaddr; | ||
219 | int nr_flips; | ||
220 | struct xen_netif_rx_request *req; | ||
221 | |||
222 | if (unlikely(!netif_carrier_ok(dev))) | ||
223 | return; | ||
224 | |||
225 | /* | ||
226 | * Allocate skbuffs greedily, even though we batch updates to the | ||
227 | * receive ring. This creates a less bursty demand on the memory | ||
228 | * allocator, so should reduce the chance of failed allocation requests | ||
229 | * both for ourself and for other kernel subsystems. | ||
230 | */ | ||
231 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); | ||
232 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { | ||
233 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD, | ||
234 | GFP_ATOMIC | __GFP_NOWARN); | ||
235 | if (unlikely(!skb)) | ||
236 | goto no_skb; | ||
237 | |||
238 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); | ||
239 | if (!page) { | ||
240 | kfree_skb(skb); | ||
241 | no_skb: | ||
242 | /* Any skbuffs queued for refill? Force them out. */ | ||
243 | if (i != 0) | ||
244 | goto refill; | ||
245 | /* Could not allocate any skbuffs. Try again later. */ | ||
246 | mod_timer(&np->rx_refill_timer, | ||
247 | jiffies + (HZ/10)); | ||
248 | break; | ||
249 | } | ||
250 | |||
251 | skb_shinfo(skb)->frags[0].page = page; | ||
252 | skb_shinfo(skb)->nr_frags = 1; | ||
253 | __skb_queue_tail(&np->rx_batch, skb); | ||
254 | } | ||
255 | |||
256 | /* Is the batch large enough to be worthwhile? */ | ||
257 | if (i < (np->rx_target/2)) { | ||
258 | if (req_prod > np->rx.sring->req_prod) | ||
259 | goto push; | ||
260 | return; | ||
261 | } | ||
262 | |||
263 | /* Adjust our fill target if we risked running out of buffers. */ | ||
264 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && | ||
265 | ((np->rx_target *= 2) > np->rx_max_target)) | ||
266 | np->rx_target = np->rx_max_target; | ||
267 | |||
268 | refill: | ||
269 | for (nr_flips = i = 0; ; i++) { | ||
270 | skb = __skb_dequeue(&np->rx_batch); | ||
271 | if (skb == NULL) | ||
272 | break; | ||
273 | |||
274 | skb->dev = dev; | ||
275 | |||
276 | id = xennet_rxidx(req_prod + i); | ||
277 | |||
278 | BUG_ON(np->rx_skbs[id]); | ||
279 | np->rx_skbs[id] = skb; | ||
280 | |||
281 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); | ||
282 | BUG_ON((signed short)ref < 0); | ||
283 | np->grant_rx_ref[id] = ref; | ||
284 | |||
285 | pfn = page_to_pfn(skb_shinfo(skb)->frags[0].page); | ||
286 | vaddr = page_address(skb_shinfo(skb)->frags[0].page); | ||
287 | |||
288 | req = RING_GET_REQUEST(&np->rx, req_prod + i); | ||
289 | gnttab_grant_foreign_access_ref(ref, | ||
290 | np->xbdev->otherend_id, | ||
291 | pfn_to_mfn(pfn), | ||
292 | 0); | ||
293 | |||
294 | req->id = id; | ||
295 | req->gref = ref; | ||
296 | } | ||
297 | |||
298 | if (nr_flips != 0) { | ||
299 | reservation.extent_start = np->rx_pfn_array; | ||
300 | reservation.nr_extents = nr_flips; | ||
301 | reservation.extent_order = 0; | ||
302 | reservation.address_bits = 0; | ||
303 | reservation.domid = DOMID_SELF; | ||
304 | |||
305 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | ||
306 | /* After all PTEs have been zapped, flush the TLB. */ | ||
307 | np->rx_mcl[i-1].args[MULTI_UVMFLAGS_INDEX] = | ||
308 | UVMF_TLB_FLUSH|UVMF_ALL; | ||
309 | |||
310 | /* Give away a batch of pages. */ | ||
311 | np->rx_mcl[i].op = __HYPERVISOR_memory_op; | ||
312 | np->rx_mcl[i].args[0] = XENMEM_decrease_reservation; | ||
313 | np->rx_mcl[i].args[1] = (unsigned long)&reservation; | ||
314 | |||
315 | /* Zap PTEs and give away pages in one big | ||
316 | * multicall. */ | ||
317 | (void)HYPERVISOR_multicall(np->rx_mcl, i+1); | ||
318 | |||
319 | /* Check return status of HYPERVISOR_memory_op(). */ | ||
320 | if (unlikely(np->rx_mcl[i].result != i)) | ||
321 | panic("Unable to reduce memory reservation\n"); | ||
322 | } else { | ||
323 | if (HYPERVISOR_memory_op(XENMEM_decrease_reservation, | ||
324 | &reservation) != i) | ||
325 | panic("Unable to reduce memory reservation\n"); | ||
326 | } | ||
327 | } else { | ||
328 | wmb(); /* barrier so backend seens requests */ | ||
329 | } | ||
330 | |||
331 | /* Above is a suitable barrier to ensure backend will see requests. */ | ||
332 | np->rx.req_prod_pvt = req_prod + i; | ||
333 | push: | ||
334 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); | ||
335 | if (notify) | ||
336 | notify_remote_via_irq(np->netdev->irq); | ||
337 | } | ||
338 | |||
339 | static int xennet_open(struct net_device *dev) | ||
340 | { | ||
341 | struct netfront_info *np = netdev_priv(dev); | ||
342 | |||
343 | memset(&np->stats, 0, sizeof(np->stats)); | ||
344 | |||
345 | spin_lock_bh(&np->rx_lock); | ||
346 | if (netif_carrier_ok(dev)) { | ||
347 | xennet_alloc_rx_buffers(dev); | ||
348 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; | ||
349 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | ||
350 | netif_rx_schedule(dev); | ||
351 | } | ||
352 | spin_unlock_bh(&np->rx_lock); | ||
353 | |||
354 | xennet_maybe_wake_tx(dev); | ||
355 | |||
356 | return 0; | ||
357 | } | ||
358 | |||
359 | static void xennet_tx_buf_gc(struct net_device *dev) | ||
360 | { | ||
361 | RING_IDX cons, prod; | ||
362 | unsigned short id; | ||
363 | struct netfront_info *np = netdev_priv(dev); | ||
364 | struct sk_buff *skb; | ||
365 | |||
366 | BUG_ON(!netif_carrier_ok(dev)); | ||
367 | |||
368 | do { | ||
369 | prod = np->tx.sring->rsp_prod; | ||
370 | rmb(); /* Ensure we see responses up to 'rp'. */ | ||
371 | |||
372 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { | ||
373 | struct xen_netif_tx_response *txrsp; | ||
374 | |||
375 | txrsp = RING_GET_RESPONSE(&np->tx, cons); | ||
376 | if (txrsp->status == NETIF_RSP_NULL) | ||
377 | continue; | ||
378 | |||
379 | id = txrsp->id; | ||
380 | skb = np->tx_skbs[id].skb; | ||
381 | if (unlikely(gnttab_query_foreign_access( | ||
382 | np->grant_tx_ref[id]) != 0)) { | ||
383 | printk(KERN_ALERT "xennet_tx_buf_gc: warning " | ||
384 | "-- grant still in use by backend " | ||
385 | "domain.\n"); | ||
386 | BUG(); | ||
387 | } | ||
388 | gnttab_end_foreign_access_ref( | ||
389 | np->grant_tx_ref[id], GNTMAP_readonly); | ||
390 | gnttab_release_grant_reference( | ||
391 | &np->gref_tx_head, np->grant_tx_ref[id]); | ||
392 | np->grant_tx_ref[id] = GRANT_INVALID_REF; | ||
393 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); | ||
394 | dev_kfree_skb_irq(skb); | ||
395 | } | ||
396 | |||
397 | np->tx.rsp_cons = prod; | ||
398 | |||
399 | /* | ||
400 | * Set a new event, then check for race with update of tx_cons. | ||
401 | * Note that it is essential to schedule a callback, no matter | ||
402 | * how few buffers are pending. Even if there is space in the | ||
403 | * transmit ring, higher layers may be blocked because too much | ||
404 | * data is outstanding: in such cases notification from Xen is | ||
405 | * likely to be the only kick that we'll get. | ||
406 | */ | ||
407 | np->tx.sring->rsp_event = | ||
408 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; | ||
409 | mb(); /* update shared area */ | ||
410 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); | ||
411 | |||
412 | xennet_maybe_wake_tx(dev); | ||
413 | } | ||
414 | |||
415 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, | ||
416 | struct xen_netif_tx_request *tx) | ||
417 | { | ||
418 | struct netfront_info *np = netdev_priv(dev); | ||
419 | char *data = skb->data; | ||
420 | unsigned long mfn; | ||
421 | RING_IDX prod = np->tx.req_prod_pvt; | ||
422 | int frags = skb_shinfo(skb)->nr_frags; | ||
423 | unsigned int offset = offset_in_page(data); | ||
424 | unsigned int len = skb_headlen(skb); | ||
425 | unsigned int id; | ||
426 | grant_ref_t ref; | ||
427 | int i; | ||
428 | |||
429 | /* While the header overlaps a page boundary (including being | ||
430 | larger than a page), split it it into page-sized chunks. */ | ||
431 | while (len > PAGE_SIZE - offset) { | ||
432 | tx->size = PAGE_SIZE - offset; | ||
433 | tx->flags |= NETTXF_more_data; | ||
434 | len -= tx->size; | ||
435 | data += tx->size; | ||
436 | offset = 0; | ||
437 | |||
438 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | ||
439 | np->tx_skbs[id].skb = skb_get(skb); | ||
440 | tx = RING_GET_REQUEST(&np->tx, prod++); | ||
441 | tx->id = id; | ||
442 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | ||
443 | BUG_ON((signed short)ref < 0); | ||
444 | |||
445 | mfn = virt_to_mfn(data); | ||
446 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | ||
447 | mfn, GNTMAP_readonly); | ||
448 | |||
449 | tx->gref = np->grant_tx_ref[id] = ref; | ||
450 | tx->offset = offset; | ||
451 | tx->size = len; | ||
452 | tx->flags = 0; | ||
453 | } | ||
454 | |||
455 | /* Grant backend access to each skb fragment page. */ | ||
456 | for (i = 0; i < frags; i++) { | ||
457 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | ||
458 | |||
459 | tx->flags |= NETTXF_more_data; | ||
460 | |||
461 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | ||
462 | np->tx_skbs[id].skb = skb_get(skb); | ||
463 | tx = RING_GET_REQUEST(&np->tx, prod++); | ||
464 | tx->id = id; | ||
465 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | ||
466 | BUG_ON((signed short)ref < 0); | ||
467 | |||
468 | mfn = pfn_to_mfn(page_to_pfn(frag->page)); | ||
469 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | ||
470 | mfn, GNTMAP_readonly); | ||
471 | |||
472 | tx->gref = np->grant_tx_ref[id] = ref; | ||
473 | tx->offset = frag->page_offset; | ||
474 | tx->size = frag->size; | ||
475 | tx->flags = 0; | ||
476 | } | ||
477 | |||
478 | np->tx.req_prod_pvt = prod; | ||
479 | } | ||
480 | |||
481 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) | ||
482 | { | ||
483 | unsigned short id; | ||
484 | struct netfront_info *np = netdev_priv(dev); | ||
485 | struct xen_netif_tx_request *tx; | ||
486 | struct xen_netif_extra_info *extra; | ||
487 | char *data = skb->data; | ||
488 | RING_IDX i; | ||
489 | grant_ref_t ref; | ||
490 | unsigned long mfn; | ||
491 | int notify; | ||
492 | int frags = skb_shinfo(skb)->nr_frags; | ||
493 | unsigned int offset = offset_in_page(data); | ||
494 | unsigned int len = skb_headlen(skb); | ||
495 | |||
496 | frags += (offset + len + PAGE_SIZE - 1) / PAGE_SIZE; | ||
497 | if (unlikely(frags > MAX_SKB_FRAGS + 1)) { | ||
498 | printk(KERN_ALERT "xennet: skb rides the rocket: %d frags\n", | ||
499 | frags); | ||
500 | dump_stack(); | ||
501 | goto drop; | ||
502 | } | ||
503 | |||
504 | spin_lock_irq(&np->tx_lock); | ||
505 | |||
506 | if (unlikely(!netif_carrier_ok(dev) || | ||
507 | (frags > 1 && !xennet_can_sg(dev)) || | ||
508 | netif_needs_gso(dev, skb))) { | ||
509 | spin_unlock_irq(&np->tx_lock); | ||
510 | goto drop; | ||
511 | } | ||
512 | |||
513 | i = np->tx.req_prod_pvt; | ||
514 | |||
515 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | ||
516 | np->tx_skbs[id].skb = skb; | ||
517 | |||
518 | tx = RING_GET_REQUEST(&np->tx, i); | ||
519 | |||
520 | tx->id = id; | ||
521 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | ||
522 | BUG_ON((signed short)ref < 0); | ||
523 | mfn = virt_to_mfn(data); | ||
524 | gnttab_grant_foreign_access_ref( | ||
525 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | ||
526 | tx->gref = np->grant_tx_ref[id] = ref; | ||
527 | tx->offset = offset; | ||
528 | tx->size = len; | ||
529 | extra = NULL; | ||
530 | |||
531 | tx->flags = 0; | ||
532 | if (skb->ip_summed == CHECKSUM_PARTIAL) | ||
533 | /* local packet? */ | ||
534 | tx->flags |= NETTXF_csum_blank | NETTXF_data_validated; | ||
535 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) | ||
536 | /* remote but checksummed. */ | ||
537 | tx->flags |= NETTXF_data_validated; | ||
538 | |||
539 | if (skb_shinfo(skb)->gso_size) { | ||
540 | struct xen_netif_extra_info *gso; | ||
541 | |||
542 | gso = (struct xen_netif_extra_info *) | ||
543 | RING_GET_REQUEST(&np->tx, ++i); | ||
544 | |||
545 | if (extra) | ||
546 | extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; | ||
547 | else | ||
548 | tx->flags |= NETTXF_extra_info; | ||
549 | |||
550 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | ||
551 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; | ||
552 | gso->u.gso.pad = 0; | ||
553 | gso->u.gso.features = 0; | ||
554 | |||
555 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | ||
556 | gso->flags = 0; | ||
557 | extra = gso; | ||
558 | } | ||
559 | |||
560 | np->tx.req_prod_pvt = i + 1; | ||
561 | |||
562 | xennet_make_frags(skb, dev, tx); | ||
563 | tx->size = skb->len; | ||
564 | |||
565 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | ||
566 | if (notify) | ||
567 | notify_remote_via_irq(np->netdev->irq); | ||
568 | |||
569 | xennet_tx_buf_gc(dev); | ||
570 | |||
571 | if (!netfront_tx_slot_available(np)) | ||
572 | netif_stop_queue(dev); | ||
573 | |||
574 | spin_unlock_irq(&np->tx_lock); | ||
575 | |||
576 | np->stats.tx_bytes += skb->len; | ||
577 | np->stats.tx_packets++; | ||
578 | |||
579 | return 0; | ||
580 | |||
581 | drop: | ||
582 | np->stats.tx_dropped++; | ||
583 | dev_kfree_skb(skb); | ||
584 | return 0; | ||
585 | } | ||
586 | |||
587 | static int xennet_close(struct net_device *dev) | ||
588 | { | ||
589 | struct netfront_info *np = netdev_priv(dev); | ||
590 | netif_stop_queue(np->netdev); | ||
591 | return 0; | ||
592 | } | ||
593 | |||
594 | static struct net_device_stats *xennet_get_stats(struct net_device *dev) | ||
595 | { | ||
596 | struct netfront_info *np = netdev_priv(dev); | ||
597 | return &np->stats; | ||
598 | } | ||
599 | |||
600 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, | ||
601 | grant_ref_t ref) | ||
602 | { | ||
603 | int new = xennet_rxidx(np->rx.req_prod_pvt); | ||
604 | |||
605 | BUG_ON(np->rx_skbs[new]); | ||
606 | np->rx_skbs[new] = skb; | ||
607 | np->grant_rx_ref[new] = ref; | ||
608 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | ||
609 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | ||
610 | np->rx.req_prod_pvt++; | ||
611 | } | ||
612 | |||
613 | static int xennet_get_extras(struct netfront_info *np, | ||
614 | struct xen_netif_extra_info *extras, | ||
615 | RING_IDX rp) | ||
616 | |||
617 | { | ||
618 | struct xen_netif_extra_info *extra; | ||
619 | struct device *dev = &np->netdev->dev; | ||
620 | RING_IDX cons = np->rx.rsp_cons; | ||
621 | int err = 0; | ||
622 | |||
623 | do { | ||
624 | struct sk_buff *skb; | ||
625 | grant_ref_t ref; | ||
626 | |||
627 | if (unlikely(cons + 1 == rp)) { | ||
628 | if (net_ratelimit()) | ||
629 | dev_warn(dev, "Missing extra info\n"); | ||
630 | err = -EBADR; | ||
631 | break; | ||
632 | } | ||
633 | |||
634 | extra = (struct xen_netif_extra_info *) | ||
635 | RING_GET_RESPONSE(&np->rx, ++cons); | ||
636 | |||
637 | if (unlikely(!extra->type || | ||
638 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | ||
639 | if (net_ratelimit()) | ||
640 | dev_warn(dev, "Invalid extra type: %d\n", | ||
641 | extra->type); | ||
642 | err = -EINVAL; | ||
643 | } else { | ||
644 | memcpy(&extras[extra->type - 1], extra, | ||
645 | sizeof(*extra)); | ||
646 | } | ||
647 | |||
648 | skb = xennet_get_rx_skb(np, cons); | ||
649 | ref = xennet_get_rx_ref(np, cons); | ||
650 | xennet_move_rx_slot(np, skb, ref); | ||
651 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | ||
652 | |||
653 | np->rx.rsp_cons = cons; | ||
654 | return err; | ||
655 | } | ||
656 | |||
657 | static int xennet_get_responses(struct netfront_info *np, | ||
658 | struct netfront_rx_info *rinfo, RING_IDX rp, | ||
659 | struct sk_buff_head *list) | ||
660 | { | ||
661 | struct xen_netif_rx_response *rx = &rinfo->rx; | ||
662 | struct xen_netif_extra_info *extras = rinfo->extras; | ||
663 | struct device *dev = &np->netdev->dev; | ||
664 | RING_IDX cons = np->rx.rsp_cons; | ||
665 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | ||
666 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | ||
667 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | ||
668 | int frags = 1; | ||
669 | int err = 0; | ||
670 | unsigned long ret; | ||
671 | |||
672 | if (rx->flags & NETRXF_extra_info) { | ||
673 | err = xennet_get_extras(np, extras, rp); | ||
674 | cons = np->rx.rsp_cons; | ||
675 | } | ||
676 | |||
677 | for (;;) { | ||
678 | if (unlikely(rx->status < 0 || | ||
679 | rx->offset + rx->status > PAGE_SIZE)) { | ||
680 | if (net_ratelimit()) | ||
681 | dev_warn(dev, "rx->offset: %x, size: %u\n", | ||
682 | rx->offset, rx->status); | ||
683 | xennet_move_rx_slot(np, skb, ref); | ||
684 | err = -EINVAL; | ||
685 | goto next; | ||
686 | } | ||
687 | |||
688 | /* | ||
689 | * This definitely indicates a bug, either in this driver or in | ||
690 | * the backend driver. In future this should flag the bad | ||
691 | * situation to the system controller to reboot the backed. | ||
692 | */ | ||
693 | if (ref == GRANT_INVALID_REF) { | ||
694 | if (net_ratelimit()) | ||
695 | dev_warn(dev, "Bad rx response id %d.\n", | ||
696 | rx->id); | ||
697 | err = -EINVAL; | ||
698 | goto next; | ||
699 | } | ||
700 | |||
701 | ret = gnttab_end_foreign_access_ref(ref, 0); | ||
702 | BUG_ON(!ret); | ||
703 | |||
704 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | ||
705 | |||
706 | __skb_queue_tail(list, skb); | ||
707 | |||
708 | next: | ||
709 | if (!(rx->flags & NETRXF_more_data)) | ||
710 | break; | ||
711 | |||
712 | if (cons + frags == rp) { | ||
713 | if (net_ratelimit()) | ||
714 | dev_warn(dev, "Need more frags\n"); | ||
715 | err = -ENOENT; | ||
716 | break; | ||
717 | } | ||
718 | |||
719 | rx = RING_GET_RESPONSE(&np->rx, cons + frags); | ||
720 | skb = xennet_get_rx_skb(np, cons + frags); | ||
721 | ref = xennet_get_rx_ref(np, cons + frags); | ||
722 | frags++; | ||
723 | } | ||
724 | |||
725 | if (unlikely(frags > max)) { | ||
726 | if (net_ratelimit()) | ||
727 | dev_warn(dev, "Too many frags\n"); | ||
728 | err = -E2BIG; | ||
729 | } | ||
730 | |||
731 | if (unlikely(err)) | ||
732 | np->rx.rsp_cons = cons + frags; | ||
733 | |||
734 | return err; | ||
735 | } | ||
736 | |||
737 | static int xennet_set_skb_gso(struct sk_buff *skb, | ||
738 | struct xen_netif_extra_info *gso) | ||
739 | { | ||
740 | if (!gso->u.gso.size) { | ||
741 | if (net_ratelimit()) | ||
742 | printk(KERN_WARNING "GSO size must not be zero.\n"); | ||
743 | return -EINVAL; | ||
744 | } | ||
745 | |||
746 | /* Currently only TCPv4 S.O. is supported. */ | ||
747 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { | ||
748 | if (net_ratelimit()) | ||
749 | printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); | ||
750 | return -EINVAL; | ||
751 | } | ||
752 | |||
753 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | ||
754 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | ||
755 | |||
756 | /* Header must be checked, and gso_segs computed. */ | ||
757 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | ||
758 | skb_shinfo(skb)->gso_segs = 0; | ||
759 | |||
760 | return 0; | ||
761 | } | ||
762 | |||
763 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | ||
764 | struct sk_buff *skb, | ||
765 | struct sk_buff_head *list) | ||
766 | { | ||
767 | struct skb_shared_info *shinfo = skb_shinfo(skb); | ||
768 | int nr_frags = shinfo->nr_frags; | ||
769 | RING_IDX cons = np->rx.rsp_cons; | ||
770 | skb_frag_t *frag = shinfo->frags + nr_frags; | ||
771 | struct sk_buff *nskb; | ||
772 | |||
773 | while ((nskb = __skb_dequeue(list))) { | ||
774 | struct xen_netif_rx_response *rx = | ||
775 | RING_GET_RESPONSE(&np->rx, ++cons); | ||
776 | |||
777 | frag->page = skb_shinfo(nskb)->frags[0].page; | ||
778 | frag->page_offset = rx->offset; | ||
779 | frag->size = rx->status; | ||
780 | |||
781 | skb->data_len += rx->status; | ||
782 | |||
783 | skb_shinfo(nskb)->nr_frags = 0; | ||
784 | kfree_skb(nskb); | ||
785 | |||
786 | frag++; | ||
787 | nr_frags++; | ||
788 | } | ||
789 | |||
790 | shinfo->nr_frags = nr_frags; | ||
791 | return cons; | ||
792 | } | ||
793 | |||
794 | static int skb_checksum_setup(struct sk_buff *skb) | ||
795 | { | ||
796 | struct iphdr *iph; | ||
797 | unsigned char *th; | ||
798 | int err = -EPROTO; | ||
799 | |||
800 | if (skb->protocol != htons(ETH_P_IP)) | ||
801 | goto out; | ||
802 | |||
803 | iph = (void *)skb->data; | ||
804 | th = skb->data + 4 * iph->ihl; | ||
805 | if (th >= skb_tail_pointer(skb)) | ||
806 | goto out; | ||
807 | |||
808 | skb->csum_start = th - skb->head; | ||
809 | switch (iph->protocol) { | ||
810 | case IPPROTO_TCP: | ||
811 | skb->csum_offset = offsetof(struct tcphdr, check); | ||
812 | break; | ||
813 | case IPPROTO_UDP: | ||
814 | skb->csum_offset = offsetof(struct udphdr, check); | ||
815 | break; | ||
816 | default: | ||
817 | if (net_ratelimit()) | ||
818 | printk(KERN_ERR "Attempting to checksum a non-" | ||
819 | "TCP/UDP packet, dropping a protocol" | ||
820 | " %d packet", iph->protocol); | ||
821 | goto out; | ||
822 | } | ||
823 | |||
824 | if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) | ||
825 | goto out; | ||
826 | |||
827 | err = 0; | ||
828 | |||
829 | out: | ||
830 | return err; | ||
831 | } | ||
832 | |||
833 | static int handle_incoming_queue(struct net_device *dev, | ||
834 | struct sk_buff_head *rxq) | ||
835 | { | ||
836 | struct netfront_info *np = netdev_priv(dev); | ||
837 | int packets_dropped = 0; | ||
838 | struct sk_buff *skb; | ||
839 | |||
840 | while ((skb = __skb_dequeue(rxq)) != NULL) { | ||
841 | struct page *page = NETFRONT_SKB_CB(skb)->page; | ||
842 | void *vaddr = page_address(page); | ||
843 | unsigned offset = NETFRONT_SKB_CB(skb)->offset; | ||
844 | |||
845 | memcpy(skb->data, vaddr + offset, | ||
846 | skb_headlen(skb)); | ||
847 | |||
848 | if (page != skb_shinfo(skb)->frags[0].page) | ||
849 | __free_page(page); | ||
850 | |||
851 | /* Ethernet work: Delayed to here as it peeks the header. */ | ||
852 | skb->protocol = eth_type_trans(skb, dev); | ||
853 | |||
854 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | ||
855 | if (skb_checksum_setup(skb)) { | ||
856 | kfree_skb(skb); | ||
857 | packets_dropped++; | ||
858 | np->stats.rx_errors++; | ||
859 | continue; | ||
860 | } | ||
861 | } | ||
862 | |||
863 | np->stats.rx_packets++; | ||
864 | np->stats.rx_bytes += skb->len; | ||
865 | |||
866 | /* Pass it up. */ | ||
867 | netif_receive_skb(skb); | ||
868 | dev->last_rx = jiffies; | ||
869 | } | ||
870 | |||
871 | return packets_dropped; | ||
872 | } | ||
873 | |||
874 | static int xennet_poll(struct net_device *dev, int *pbudget) | ||
875 | { | ||
876 | struct netfront_info *np = netdev_priv(dev); | ||
877 | struct sk_buff *skb; | ||
878 | struct netfront_rx_info rinfo; | ||
879 | struct xen_netif_rx_response *rx = &rinfo.rx; | ||
880 | struct xen_netif_extra_info *extras = rinfo.extras; | ||
881 | RING_IDX i, rp; | ||
882 | int work_done, budget, more_to_do = 1; | ||
883 | struct sk_buff_head rxq; | ||
884 | struct sk_buff_head errq; | ||
885 | struct sk_buff_head tmpq; | ||
886 | unsigned long flags; | ||
887 | unsigned int len; | ||
888 | int err; | ||
889 | |||
890 | spin_lock(&np->rx_lock); | ||
891 | |||
892 | if (unlikely(!netif_carrier_ok(dev))) { | ||
893 | spin_unlock(&np->rx_lock); | ||
894 | return 0; | ||
895 | } | ||
896 | |||
897 | skb_queue_head_init(&rxq); | ||
898 | skb_queue_head_init(&errq); | ||
899 | skb_queue_head_init(&tmpq); | ||
900 | |||
901 | budget = *pbudget; | ||
902 | if (budget > dev->quota) | ||
903 | budget = dev->quota; | ||
904 | rp = np->rx.sring->rsp_prod; | ||
905 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | ||
906 | |||
907 | i = np->rx.rsp_cons; | ||
908 | work_done = 0; | ||
909 | while ((i != rp) && (work_done < budget)) { | ||
910 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | ||
911 | memset(extras, 0, sizeof(rinfo.extras)); | ||
912 | |||
913 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | ||
914 | |||
915 | if (unlikely(err)) { | ||
916 | err: | ||
917 | while ((skb = __skb_dequeue(&tmpq))) | ||
918 | __skb_queue_tail(&errq, skb); | ||
919 | np->stats.rx_errors++; | ||
920 | i = np->rx.rsp_cons; | ||
921 | continue; | ||
922 | } | ||
923 | |||
924 | skb = __skb_dequeue(&tmpq); | ||
925 | |||
926 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | ||
927 | struct xen_netif_extra_info *gso; | ||
928 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | ||
929 | |||
930 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | ||
931 | __skb_queue_head(&tmpq, skb); | ||
932 | np->rx.rsp_cons += skb_queue_len(&tmpq); | ||
933 | goto err; | ||
934 | } | ||
935 | } | ||
936 | |||
937 | NETFRONT_SKB_CB(skb)->page = skb_shinfo(skb)->frags[0].page; | ||
938 | NETFRONT_SKB_CB(skb)->offset = rx->offset; | ||
939 | |||
940 | len = rx->status; | ||
941 | if (len > RX_COPY_THRESHOLD) | ||
942 | len = RX_COPY_THRESHOLD; | ||
943 | skb_put(skb, len); | ||
944 | |||
945 | if (rx->status > len) { | ||
946 | skb_shinfo(skb)->frags[0].page_offset = | ||
947 | rx->offset + len; | ||
948 | skb_shinfo(skb)->frags[0].size = rx->status - len; | ||
949 | skb->data_len = rx->status - len; | ||
950 | } else { | ||
951 | skb_shinfo(skb)->frags[0].page = NULL; | ||
952 | skb_shinfo(skb)->nr_frags = 0; | ||
953 | } | ||
954 | |||
955 | i = xennet_fill_frags(np, skb, &tmpq); | ||
956 | |||
957 | /* | ||
958 | * Truesize approximates the size of true data plus | ||
959 | * any supervisor overheads. Adding hypervisor | ||
960 | * overheads has been shown to significantly reduce | ||
961 | * achievable bandwidth with the default receive | ||
962 | * buffer size. It is therefore not wise to account | ||
963 | * for it here. | ||
964 | * | ||
965 | * After alloc_skb(RX_COPY_THRESHOLD), truesize is set | ||
966 | * to RX_COPY_THRESHOLD + the supervisor | ||
967 | * overheads. Here, we add the size of the data pulled | ||
968 | * in xennet_fill_frags(). | ||
969 | * | ||
970 | * We also adjust for any unused space in the main | ||
971 | * data area by subtracting (RX_COPY_THRESHOLD - | ||
972 | * len). This is especially important with drivers | ||
973 | * which split incoming packets into header and data, | ||
974 | * using only 66 bytes of the main data area (see the | ||
975 | * e1000 driver for example.) On such systems, | ||
976 | * without this last adjustement, our achievable | ||
977 | * receive throughout using the standard receive | ||
978 | * buffer size was cut by 25%(!!!). | ||
979 | */ | ||
980 | skb->truesize += skb->data_len - (RX_COPY_THRESHOLD - len); | ||
981 | skb->len += skb->data_len; | ||
982 | |||
983 | if (rx->flags & NETRXF_csum_blank) | ||
984 | skb->ip_summed = CHECKSUM_PARTIAL; | ||
985 | else if (rx->flags & NETRXF_data_validated) | ||
986 | skb->ip_summed = CHECKSUM_UNNECESSARY; | ||
987 | |||
988 | __skb_queue_tail(&rxq, skb); | ||
989 | |||
990 | np->rx.rsp_cons = ++i; | ||
991 | work_done++; | ||
992 | } | ||
993 | |||
994 | while ((skb = __skb_dequeue(&errq))) | ||
995 | kfree_skb(skb); | ||
996 | |||
997 | work_done -= handle_incoming_queue(dev, &rxq); | ||
998 | |||
999 | /* If we get a callback with very few responses, reduce fill target. */ | ||
1000 | /* NB. Note exponential increase, linear decrease. */ | ||
1001 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > | ||
1002 | ((3*np->rx_target) / 4)) && | ||
1003 | (--np->rx_target < np->rx_min_target)) | ||
1004 | np->rx_target = np->rx_min_target; | ||
1005 | |||
1006 | xennet_alloc_rx_buffers(dev); | ||
1007 | |||
1008 | *pbudget -= work_done; | ||
1009 | dev->quota -= work_done; | ||
1010 | |||
1011 | if (work_done < budget) { | ||
1012 | local_irq_save(flags); | ||
1013 | |||
1014 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | ||
1015 | if (!more_to_do) | ||
1016 | __netif_rx_complete(dev); | ||
1017 | |||
1018 | local_irq_restore(flags); | ||
1019 | } | ||
1020 | |||
1021 | spin_unlock(&np->rx_lock); | ||
1022 | |||
1023 | return more_to_do; | ||
1024 | } | ||
1025 | |||
1026 | static int xennet_change_mtu(struct net_device *dev, int mtu) | ||
1027 | { | ||
1028 | int max = xennet_can_sg(dev) ? 65535 - ETH_HLEN : ETH_DATA_LEN; | ||
1029 | |||
1030 | if (mtu > max) | ||
1031 | return -EINVAL; | ||
1032 | dev->mtu = mtu; | ||
1033 | return 0; | ||
1034 | } | ||
1035 | |||
1036 | static void xennet_release_tx_bufs(struct netfront_info *np) | ||
1037 | { | ||
1038 | struct sk_buff *skb; | ||
1039 | int i; | ||
1040 | |||
1041 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | ||
1042 | /* Skip over entries which are actually freelist references */ | ||
1043 | if ((unsigned long)np->tx_skbs[i].skb < PAGE_OFFSET) | ||
1044 | continue; | ||
1045 | |||
1046 | skb = np->tx_skbs[i].skb; | ||
1047 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], | ||
1048 | GNTMAP_readonly); | ||
1049 | gnttab_release_grant_reference(&np->gref_tx_head, | ||
1050 | np->grant_tx_ref[i]); | ||
1051 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | ||
1052 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | ||
1053 | dev_kfree_skb_irq(skb); | ||
1054 | } | ||
1055 | } | ||
1056 | |||
1057 | static void xennet_release_rx_bufs(struct netfront_info *np) | ||
1058 | { | ||
1059 | struct mmu_update *mmu = np->rx_mmu; | ||
1060 | struct multicall_entry *mcl = np->rx_mcl; | ||
1061 | struct sk_buff_head free_list; | ||
1062 | struct sk_buff *skb; | ||
1063 | unsigned long mfn; | ||
1064 | int xfer = 0, noxfer = 0, unused = 0; | ||
1065 | int id, ref; | ||
1066 | |||
1067 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", | ||
1068 | __func__); | ||
1069 | return; | ||
1070 | |||
1071 | skb_queue_head_init(&free_list); | ||
1072 | |||
1073 | spin_lock_bh(&np->rx_lock); | ||
1074 | |||
1075 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | ||
1076 | ref = np->grant_rx_ref[id]; | ||
1077 | if (ref == GRANT_INVALID_REF) { | ||
1078 | unused++; | ||
1079 | continue; | ||
1080 | } | ||
1081 | |||
1082 | skb = np->rx_skbs[id]; | ||
1083 | mfn = gnttab_end_foreign_transfer_ref(ref); | ||
1084 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | ||
1085 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | ||
1086 | |||
1087 | if (0 == mfn) { | ||
1088 | skb_shinfo(skb)->nr_frags = 0; | ||
1089 | dev_kfree_skb(skb); | ||
1090 | noxfer++; | ||
1091 | continue; | ||
1092 | } | ||
1093 | |||
1094 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | ||
1095 | /* Remap the page. */ | ||
1096 | struct page *page = skb_shinfo(skb)->frags[0].page; | ||
1097 | unsigned long pfn = page_to_pfn(page); | ||
1098 | void *vaddr = page_address(page); | ||
1099 | |||
1100 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, | ||
1101 | mfn_pte(mfn, PAGE_KERNEL), | ||
1102 | 0); | ||
1103 | mcl++; | ||
1104 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) | ||
1105 | | MMU_MACHPHYS_UPDATE; | ||
1106 | mmu->val = pfn; | ||
1107 | mmu++; | ||
1108 | |||
1109 | set_phys_to_machine(pfn, mfn); | ||
1110 | } | ||
1111 | __skb_queue_tail(&free_list, skb); | ||
1112 | xfer++; | ||
1113 | } | ||
1114 | |||
1115 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", | ||
1116 | __func__, xfer, noxfer, unused); | ||
1117 | |||
1118 | if (xfer) { | ||
1119 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | ||
1120 | /* Do all the remapping work and M2P updates. */ | ||
1121 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, | ||
1122 | 0, DOMID_SELF); | ||
1123 | mcl++; | ||
1124 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); | ||
1125 | } | ||
1126 | } | ||
1127 | |||
1128 | while ((skb = __skb_dequeue(&free_list)) != NULL) | ||
1129 | dev_kfree_skb(skb); | ||
1130 | |||
1131 | spin_unlock_bh(&np->rx_lock); | ||
1132 | } | ||
1133 | |||
1134 | static void xennet_uninit(struct net_device *dev) | ||
1135 | { | ||
1136 | struct netfront_info *np = netdev_priv(dev); | ||
1137 | xennet_release_tx_bufs(np); | ||
1138 | xennet_release_rx_bufs(np); | ||
1139 | gnttab_free_grant_references(np->gref_tx_head); | ||
1140 | gnttab_free_grant_references(np->gref_rx_head); | ||
1141 | } | ||
1142 | |||
1143 | static struct net_device * __devinit xennet_create_dev(struct xenbus_device *dev) | ||
1144 | { | ||
1145 | int i, err; | ||
1146 | struct net_device *netdev; | ||
1147 | struct netfront_info *np; | ||
1148 | |||
1149 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | ||
1150 | if (!netdev) { | ||
1151 | printk(KERN_WARNING "%s> alloc_etherdev failed.\n", | ||
1152 | __func__); | ||
1153 | return ERR_PTR(-ENOMEM); | ||
1154 | } | ||
1155 | |||
1156 | np = netdev_priv(netdev); | ||
1157 | np->xbdev = dev; | ||
1158 | |||
1159 | spin_lock_init(&np->tx_lock); | ||
1160 | spin_lock_init(&np->rx_lock); | ||
1161 | |||
1162 | skb_queue_head_init(&np->rx_batch); | ||
1163 | np->rx_target = RX_DFL_MIN_TARGET; | ||
1164 | np->rx_min_target = RX_DFL_MIN_TARGET; | ||
1165 | np->rx_max_target = RX_MAX_TARGET; | ||
1166 | |||
1167 | init_timer(&np->rx_refill_timer); | ||
1168 | np->rx_refill_timer.data = (unsigned long)netdev; | ||
1169 | np->rx_refill_timer.function = rx_refill_timeout; | ||
1170 | |||
1171 | /* Initialise tx_skbs as a free chain containing every entry. */ | ||
1172 | np->tx_skb_freelist = 0; | ||
1173 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | ||
1174 | np->tx_skbs[i].link = i+1; | ||
1175 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | ||
1176 | } | ||
1177 | |||
1178 | /* Clear out rx_skbs */ | ||
1179 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | ||
1180 | np->rx_skbs[i] = NULL; | ||
1181 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | ||
1182 | } | ||
1183 | |||
1184 | /* A grant for every tx ring slot */ | ||
1185 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | ||
1186 | &np->gref_tx_head) < 0) { | ||
1187 | printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); | ||
1188 | err = -ENOMEM; | ||
1189 | goto exit; | ||
1190 | } | ||
1191 | /* A grant for every rx ring slot */ | ||
1192 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | ||
1193 | &np->gref_rx_head) < 0) { | ||
1194 | printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); | ||
1195 | err = -ENOMEM; | ||
1196 | goto exit_free_tx; | ||
1197 | } | ||
1198 | |||
1199 | netdev->open = xennet_open; | ||
1200 | netdev->hard_start_xmit = xennet_start_xmit; | ||
1201 | netdev->stop = xennet_close; | ||
1202 | netdev->get_stats = xennet_get_stats; | ||
1203 | netdev->poll = xennet_poll; | ||
1204 | netdev->uninit = xennet_uninit; | ||
1205 | netdev->change_mtu = xennet_change_mtu; | ||
1206 | netdev->weight = 64; | ||
1207 | netdev->features = NETIF_F_IP_CSUM; | ||
1208 | |||
1209 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); | ||
1210 | SET_MODULE_OWNER(netdev); | ||
1211 | SET_NETDEV_DEV(netdev, &dev->dev); | ||
1212 | |||
1213 | np->netdev = netdev; | ||
1214 | |||
1215 | netif_carrier_off(netdev); | ||
1216 | |||
1217 | return netdev; | ||
1218 | |||
1219 | exit_free_tx: | ||
1220 | gnttab_free_grant_references(np->gref_tx_head); | ||
1221 | exit: | ||
1222 | free_netdev(netdev); | ||
1223 | return ERR_PTR(err); | ||
1224 | } | ||
1225 | |||
1226 | /** | ||
1227 | * Entry point to this code when a new device is created. Allocate the basic | ||
1228 | * structures and the ring buffers for communication with the backend, and | ||
1229 | * inform the backend of the appropriate details for those. | ||
1230 | */ | ||
1231 | static int __devinit netfront_probe(struct xenbus_device *dev, | ||
1232 | const struct xenbus_device_id *id) | ||
1233 | { | ||
1234 | int err; | ||
1235 | struct net_device *netdev; | ||
1236 | struct netfront_info *info; | ||
1237 | |||
1238 | netdev = xennet_create_dev(dev); | ||
1239 | if (IS_ERR(netdev)) { | ||
1240 | err = PTR_ERR(netdev); | ||
1241 | xenbus_dev_fatal(dev, err, "creating netdev"); | ||
1242 | return err; | ||
1243 | } | ||
1244 | |||
1245 | info = netdev_priv(netdev); | ||
1246 | dev->dev.driver_data = info; | ||
1247 | |||
1248 | err = register_netdev(info->netdev); | ||
1249 | if (err) { | ||
1250 | printk(KERN_WARNING "%s: register_netdev err=%d\n", | ||
1251 | __func__, err); | ||
1252 | goto fail; | ||
1253 | } | ||
1254 | |||
1255 | err = xennet_sysfs_addif(info->netdev); | ||
1256 | if (err) { | ||
1257 | unregister_netdev(info->netdev); | ||
1258 | printk(KERN_WARNING "%s: add sysfs failed err=%d\n", | ||
1259 | __func__, err); | ||
1260 | goto fail; | ||
1261 | } | ||
1262 | |||
1263 | return 0; | ||
1264 | |||
1265 | fail: | ||
1266 | free_netdev(netdev); | ||
1267 | dev->dev.driver_data = NULL; | ||
1268 | return err; | ||
1269 | } | ||
1270 | |||
1271 | static void xennet_end_access(int ref, void *page) | ||
1272 | { | ||
1273 | /* This frees the page as a side-effect */ | ||
1274 | if (ref != GRANT_INVALID_REF) | ||
1275 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | ||
1276 | } | ||
1277 | |||
1278 | static void xennet_disconnect_backend(struct netfront_info *info) | ||
1279 | { | ||
1280 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | ||
1281 | spin_lock_bh(&info->rx_lock); | ||
1282 | spin_lock_irq(&info->tx_lock); | ||
1283 | netif_carrier_off(info->netdev); | ||
1284 | spin_unlock_irq(&info->tx_lock); | ||
1285 | spin_unlock_bh(&info->rx_lock); | ||
1286 | |||
1287 | if (info->netdev->irq) | ||
1288 | unbind_from_irqhandler(info->netdev->irq, info->netdev); | ||
1289 | info->evtchn = info->netdev->irq = 0; | ||
1290 | |||
1291 | /* End access and free the pages */ | ||
1292 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | ||
1293 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | ||
1294 | |||
1295 | info->tx_ring_ref = GRANT_INVALID_REF; | ||
1296 | info->rx_ring_ref = GRANT_INVALID_REF; | ||
1297 | info->tx.sring = NULL; | ||
1298 | info->rx.sring = NULL; | ||
1299 | } | ||
1300 | |||
1301 | /** | ||
1302 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | ||
1303 | * driver restart. We tear down our netif structure and recreate it, but | ||
1304 | * leave the device-layer structures intact so that this is transparent to the | ||
1305 | * rest of the kernel. | ||
1306 | */ | ||
1307 | static int netfront_resume(struct xenbus_device *dev) | ||
1308 | { | ||
1309 | struct netfront_info *info = dev->dev.driver_data; | ||
1310 | |||
1311 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | ||
1312 | |||
1313 | xennet_disconnect_backend(info); | ||
1314 | return 0; | ||
1315 | } | ||
1316 | |||
1317 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | ||
1318 | { | ||
1319 | char *s, *e, *macstr; | ||
1320 | int i; | ||
1321 | |||
1322 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | ||
1323 | if (IS_ERR(macstr)) | ||
1324 | return PTR_ERR(macstr); | ||
1325 | |||
1326 | for (i = 0; i < ETH_ALEN; i++) { | ||
1327 | mac[i] = simple_strtoul(s, &e, 16); | ||
1328 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | ||
1329 | kfree(macstr); | ||
1330 | return -ENOENT; | ||
1331 | } | ||
1332 | s = e+1; | ||
1333 | } | ||
1334 | |||
1335 | kfree(macstr); | ||
1336 | return 0; | ||
1337 | } | ||
1338 | |||
1339 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) | ||
1340 | { | ||
1341 | struct net_device *dev = dev_id; | ||
1342 | struct netfront_info *np = netdev_priv(dev); | ||
1343 | unsigned long flags; | ||
1344 | |||
1345 | spin_lock_irqsave(&np->tx_lock, flags); | ||
1346 | |||
1347 | if (likely(netif_carrier_ok(dev))) { | ||
1348 | xennet_tx_buf_gc(dev); | ||
1349 | /* Under tx_lock: protects access to rx shared-ring indexes. */ | ||
1350 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | ||
1351 | netif_rx_schedule(dev); | ||
1352 | } | ||
1353 | |||
1354 | spin_unlock_irqrestore(&np->tx_lock, flags); | ||
1355 | |||
1356 | return IRQ_HANDLED; | ||
1357 | } | ||
1358 | |||
1359 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) | ||
1360 | { | ||
1361 | struct xen_netif_tx_sring *txs; | ||
1362 | struct xen_netif_rx_sring *rxs; | ||
1363 | int err; | ||
1364 | struct net_device *netdev = info->netdev; | ||
1365 | |||
1366 | info->tx_ring_ref = GRANT_INVALID_REF; | ||
1367 | info->rx_ring_ref = GRANT_INVALID_REF; | ||
1368 | info->rx.sring = NULL; | ||
1369 | info->tx.sring = NULL; | ||
1370 | netdev->irq = 0; | ||
1371 | |||
1372 | err = xen_net_read_mac(dev, netdev->dev_addr); | ||
1373 | if (err) { | ||
1374 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | ||
1375 | goto fail; | ||
1376 | } | ||
1377 | |||
1378 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_KERNEL); | ||
1379 | if (!txs) { | ||
1380 | err = -ENOMEM; | ||
1381 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | ||
1382 | goto fail; | ||
1383 | } | ||
1384 | SHARED_RING_INIT(txs); | ||
1385 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | ||
1386 | |||
1387 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | ||
1388 | if (err < 0) { | ||
1389 | free_page((unsigned long)txs); | ||
1390 | goto fail; | ||
1391 | } | ||
1392 | |||
1393 | info->tx_ring_ref = err; | ||
1394 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_KERNEL); | ||
1395 | if (!rxs) { | ||
1396 | err = -ENOMEM; | ||
1397 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | ||
1398 | goto fail; | ||
1399 | } | ||
1400 | SHARED_RING_INIT(rxs); | ||
1401 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | ||
1402 | |||
1403 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | ||
1404 | if (err < 0) { | ||
1405 | free_page((unsigned long)rxs); | ||
1406 | goto fail; | ||
1407 | } | ||
1408 | info->rx_ring_ref = err; | ||
1409 | |||
1410 | err = xenbus_alloc_evtchn(dev, &info->evtchn); | ||
1411 | if (err) | ||
1412 | goto fail; | ||
1413 | |||
1414 | err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, | ||
1415 | IRQF_SAMPLE_RANDOM, netdev->name, | ||
1416 | netdev); | ||
1417 | if (err < 0) | ||
1418 | goto fail; | ||
1419 | netdev->irq = err; | ||
1420 | return 0; | ||
1421 | |||
1422 | fail: | ||
1423 | return err; | ||
1424 | } | ||
1425 | |||
1426 | /* Common code used when first setting up, and when resuming. */ | ||
1427 | static int talk_to_backend(struct xenbus_device *dev, | ||
1428 | struct netfront_info *info) | ||
1429 | { | ||
1430 | const char *message; | ||
1431 | struct xenbus_transaction xbt; | ||
1432 | int err; | ||
1433 | |||
1434 | /* Create shared ring, alloc event channel. */ | ||
1435 | err = setup_netfront(dev, info); | ||
1436 | if (err) | ||
1437 | goto out; | ||
1438 | |||
1439 | again: | ||
1440 | err = xenbus_transaction_start(&xbt); | ||
1441 | if (err) { | ||
1442 | xenbus_dev_fatal(dev, err, "starting transaction"); | ||
1443 | goto destroy_ring; | ||
1444 | } | ||
1445 | |||
1446 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | ||
1447 | info->tx_ring_ref); | ||
1448 | if (err) { | ||
1449 | message = "writing tx ring-ref"; | ||
1450 | goto abort_transaction; | ||
1451 | } | ||
1452 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | ||
1453 | info->rx_ring_ref); | ||
1454 | if (err) { | ||
1455 | message = "writing rx ring-ref"; | ||
1456 | goto abort_transaction; | ||
1457 | } | ||
1458 | err = xenbus_printf(xbt, dev->nodename, | ||
1459 | "event-channel", "%u", info->evtchn); | ||
1460 | if (err) { | ||
1461 | message = "writing event-channel"; | ||
1462 | goto abort_transaction; | ||
1463 | } | ||
1464 | |||
1465 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | ||
1466 | 1); | ||
1467 | if (err) { | ||
1468 | message = "writing request-rx-copy"; | ||
1469 | goto abort_transaction; | ||
1470 | } | ||
1471 | |||
1472 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | ||
1473 | if (err) { | ||
1474 | message = "writing feature-rx-notify"; | ||
1475 | goto abort_transaction; | ||
1476 | } | ||
1477 | |||
1478 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | ||
1479 | if (err) { | ||
1480 | message = "writing feature-sg"; | ||
1481 | goto abort_transaction; | ||
1482 | } | ||
1483 | |||
1484 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | ||
1485 | if (err) { | ||
1486 | message = "writing feature-gso-tcpv4"; | ||
1487 | goto abort_transaction; | ||
1488 | } | ||
1489 | |||
1490 | err = xenbus_transaction_end(xbt, 0); | ||
1491 | if (err) { | ||
1492 | if (err == -EAGAIN) | ||
1493 | goto again; | ||
1494 | xenbus_dev_fatal(dev, err, "completing transaction"); | ||
1495 | goto destroy_ring; | ||
1496 | } | ||
1497 | |||
1498 | return 0; | ||
1499 | |||
1500 | abort_transaction: | ||
1501 | xenbus_transaction_end(xbt, 1); | ||
1502 | xenbus_dev_fatal(dev, err, "%s", message); | ||
1503 | destroy_ring: | ||
1504 | xennet_disconnect_backend(info); | ||
1505 | out: | ||
1506 | return err; | ||
1507 | } | ||
1508 | |||
1509 | static int xennet_set_sg(struct net_device *dev, u32 data) | ||
1510 | { | ||
1511 | if (data) { | ||
1512 | struct netfront_info *np = netdev_priv(dev); | ||
1513 | int val; | ||
1514 | |||
1515 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | ||
1516 | "%d", &val) < 0) | ||
1517 | val = 0; | ||
1518 | if (!val) | ||
1519 | return -ENOSYS; | ||
1520 | } else if (dev->mtu > ETH_DATA_LEN) | ||
1521 | dev->mtu = ETH_DATA_LEN; | ||
1522 | |||
1523 | return ethtool_op_set_sg(dev, data); | ||
1524 | } | ||
1525 | |||
1526 | static int xennet_set_tso(struct net_device *dev, u32 data) | ||
1527 | { | ||
1528 | if (data) { | ||
1529 | struct netfront_info *np = netdev_priv(dev); | ||
1530 | int val; | ||
1531 | |||
1532 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | ||
1533 | "feature-gso-tcpv4", "%d", &val) < 0) | ||
1534 | val = 0; | ||
1535 | if (!val) | ||
1536 | return -ENOSYS; | ||
1537 | } | ||
1538 | |||
1539 | return ethtool_op_set_tso(dev, data); | ||
1540 | } | ||
1541 | |||
1542 | static void xennet_set_features(struct net_device *dev) | ||
1543 | { | ||
1544 | /* Turn off all GSO bits except ROBUST. */ | ||
1545 | dev->features &= (1 << NETIF_F_GSO_SHIFT) - 1; | ||
1546 | dev->features |= NETIF_F_GSO_ROBUST; | ||
1547 | xennet_set_sg(dev, 0); | ||
1548 | |||
1549 | /* We need checksum offload to enable scatter/gather and TSO. */ | ||
1550 | if (!(dev->features & NETIF_F_IP_CSUM)) | ||
1551 | return; | ||
1552 | |||
1553 | if (!xennet_set_sg(dev, 1)) | ||
1554 | xennet_set_tso(dev, 1); | ||
1555 | } | ||
1556 | |||
1557 | static int xennet_connect(struct net_device *dev) | ||
1558 | { | ||
1559 | struct netfront_info *np = netdev_priv(dev); | ||
1560 | int i, requeue_idx, err; | ||
1561 | struct sk_buff *skb; | ||
1562 | grant_ref_t ref; | ||
1563 | struct xen_netif_rx_request *req; | ||
1564 | unsigned int feature_rx_copy; | ||
1565 | |||
1566 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | ||
1567 | "feature-rx-copy", "%u", &feature_rx_copy); | ||
1568 | if (err != 1) | ||
1569 | feature_rx_copy = 0; | ||
1570 | |||
1571 | if (!feature_rx_copy) { | ||
1572 | dev_info(&dev->dev, | ||
1573 | "backend does not support copying recieve path"); | ||
1574 | return -ENODEV; | ||
1575 | } | ||
1576 | |||
1577 | err = talk_to_backend(np->xbdev, np); | ||
1578 | if (err) | ||
1579 | return err; | ||
1580 | |||
1581 | xennet_set_features(dev); | ||
1582 | |||
1583 | spin_lock_bh(&np->rx_lock); | ||
1584 | spin_lock_irq(&np->tx_lock); | ||
1585 | |||
1586 | /* Step 1: Discard all pending TX packet fragments. */ | ||
1587 | xennet_release_tx_bufs(np); | ||
1588 | |||
1589 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | ||
1590 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | ||
1591 | if (!np->rx_skbs[i]) | ||
1592 | continue; | ||
1593 | |||
1594 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | ||
1595 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | ||
1596 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | ||
1597 | |||
1598 | gnttab_grant_foreign_access_ref( | ||
1599 | ref, np->xbdev->otherend_id, | ||
1600 | pfn_to_mfn(page_to_pfn(skb_shinfo(skb)-> | ||
1601 | frags->page)), | ||
1602 | 0); | ||
1603 | req->gref = ref; | ||
1604 | req->id = requeue_idx; | ||
1605 | |||
1606 | requeue_idx++; | ||
1607 | } | ||
1608 | |||
1609 | np->rx.req_prod_pvt = requeue_idx; | ||
1610 | |||
1611 | /* | ||
1612 | * Step 3: All public and private state should now be sane. Get | ||
1613 | * ready to start sending and receiving packets and give the driver | ||
1614 | * domain a kick because we've probably just requeued some | ||
1615 | * packets. | ||
1616 | */ | ||
1617 | netif_carrier_on(np->netdev); | ||
1618 | notify_remote_via_irq(np->netdev->irq); | ||
1619 | xennet_tx_buf_gc(dev); | ||
1620 | xennet_alloc_rx_buffers(dev); | ||
1621 | |||
1622 | spin_unlock_irq(&np->tx_lock); | ||
1623 | spin_unlock_bh(&np->rx_lock); | ||
1624 | |||
1625 | return 0; | ||
1626 | } | ||
1627 | |||
1628 | /** | ||
1629 | * Callback received when the backend's state changes. | ||
1630 | */ | ||
1631 | static void backend_changed(struct xenbus_device *dev, | ||
1632 | enum xenbus_state backend_state) | ||
1633 | { | ||
1634 | struct netfront_info *np = dev->dev.driver_data; | ||
1635 | struct net_device *netdev = np->netdev; | ||
1636 | |||
1637 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | ||
1638 | |||
1639 | switch (backend_state) { | ||
1640 | case XenbusStateInitialising: | ||
1641 | case XenbusStateInitialised: | ||
1642 | case XenbusStateConnected: | ||
1643 | case XenbusStateUnknown: | ||
1644 | case XenbusStateClosed: | ||
1645 | break; | ||
1646 | |||
1647 | case XenbusStateInitWait: | ||
1648 | if (dev->state != XenbusStateInitialising) | ||
1649 | break; | ||
1650 | if (xennet_connect(netdev) != 0) | ||
1651 | break; | ||
1652 | xenbus_switch_state(dev, XenbusStateConnected); | ||
1653 | break; | ||
1654 | |||
1655 | case XenbusStateClosing: | ||
1656 | xenbus_frontend_closed(dev); | ||
1657 | break; | ||
1658 | } | ||
1659 | } | ||
1660 | |||
1661 | static struct ethtool_ops xennet_ethtool_ops = | ||
1662 | { | ||
1663 | .get_tx_csum = ethtool_op_get_tx_csum, | ||
1664 | .set_tx_csum = ethtool_op_set_tx_csum, | ||
1665 | .get_sg = ethtool_op_get_sg, | ||
1666 | .set_sg = xennet_set_sg, | ||
1667 | .get_tso = ethtool_op_get_tso, | ||
1668 | .set_tso = xennet_set_tso, | ||
1669 | .get_link = ethtool_op_get_link, | ||
1670 | }; | ||
1671 | |||
1672 | #ifdef CONFIG_SYSFS | ||
1673 | static ssize_t show_rxbuf_min(struct device *dev, | ||
1674 | struct device_attribute *attr, char *buf) | ||
1675 | { | ||
1676 | struct net_device *netdev = to_net_dev(dev); | ||
1677 | struct netfront_info *info = netdev_priv(netdev); | ||
1678 | |||
1679 | return sprintf(buf, "%u\n", info->rx_min_target); | ||
1680 | } | ||
1681 | |||
1682 | static ssize_t store_rxbuf_min(struct device *dev, | ||
1683 | struct device_attribute *attr, | ||
1684 | const char *buf, size_t len) | ||
1685 | { | ||
1686 | struct net_device *netdev = to_net_dev(dev); | ||
1687 | struct netfront_info *np = netdev_priv(netdev); | ||
1688 | char *endp; | ||
1689 | unsigned long target; | ||
1690 | |||
1691 | if (!capable(CAP_NET_ADMIN)) | ||
1692 | return -EPERM; | ||
1693 | |||
1694 | target = simple_strtoul(buf, &endp, 0); | ||
1695 | if (endp == buf) | ||
1696 | return -EBADMSG; | ||
1697 | |||
1698 | if (target < RX_MIN_TARGET) | ||
1699 | target = RX_MIN_TARGET; | ||
1700 | if (target > RX_MAX_TARGET) | ||
1701 | target = RX_MAX_TARGET; | ||
1702 | |||
1703 | spin_lock_bh(&np->rx_lock); | ||
1704 | if (target > np->rx_max_target) | ||
1705 | np->rx_max_target = target; | ||
1706 | np->rx_min_target = target; | ||
1707 | if (target > np->rx_target) | ||
1708 | np->rx_target = target; | ||
1709 | |||
1710 | xennet_alloc_rx_buffers(netdev); | ||
1711 | |||
1712 | spin_unlock_bh(&np->rx_lock); | ||
1713 | return len; | ||
1714 | } | ||
1715 | |||
1716 | static ssize_t show_rxbuf_max(struct device *dev, | ||
1717 | struct device_attribute *attr, char *buf) | ||
1718 | { | ||
1719 | struct net_device *netdev = to_net_dev(dev); | ||
1720 | struct netfront_info *info = netdev_priv(netdev); | ||
1721 | |||
1722 | return sprintf(buf, "%u\n", info->rx_max_target); | ||
1723 | } | ||
1724 | |||
1725 | static ssize_t store_rxbuf_max(struct device *dev, | ||
1726 | struct device_attribute *attr, | ||
1727 | const char *buf, size_t len) | ||
1728 | { | ||
1729 | struct net_device *netdev = to_net_dev(dev); | ||
1730 | struct netfront_info *np = netdev_priv(netdev); | ||
1731 | char *endp; | ||
1732 | unsigned long target; | ||
1733 | |||
1734 | if (!capable(CAP_NET_ADMIN)) | ||
1735 | return -EPERM; | ||
1736 | |||
1737 | target = simple_strtoul(buf, &endp, 0); | ||
1738 | if (endp == buf) | ||
1739 | return -EBADMSG; | ||
1740 | |||
1741 | if (target < RX_MIN_TARGET) | ||
1742 | target = RX_MIN_TARGET; | ||
1743 | if (target > RX_MAX_TARGET) | ||
1744 | target = RX_MAX_TARGET; | ||
1745 | |||
1746 | spin_lock_bh(&np->rx_lock); | ||
1747 | if (target < np->rx_min_target) | ||
1748 | np->rx_min_target = target; | ||
1749 | np->rx_max_target = target; | ||
1750 | if (target < np->rx_target) | ||
1751 | np->rx_target = target; | ||
1752 | |||
1753 | xennet_alloc_rx_buffers(netdev); | ||
1754 | |||
1755 | spin_unlock_bh(&np->rx_lock); | ||
1756 | return len; | ||
1757 | } | ||
1758 | |||
1759 | static ssize_t show_rxbuf_cur(struct device *dev, | ||
1760 | struct device_attribute *attr, char *buf) | ||
1761 | { | ||
1762 | struct net_device *netdev = to_net_dev(dev); | ||
1763 | struct netfront_info *info = netdev_priv(netdev); | ||
1764 | |||
1765 | return sprintf(buf, "%u\n", info->rx_target); | ||
1766 | } | ||
1767 | |||
1768 | static struct device_attribute xennet_attrs[] = { | ||
1769 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | ||
1770 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | ||
1771 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | ||
1772 | }; | ||
1773 | |||
1774 | static int xennet_sysfs_addif(struct net_device *netdev) | ||
1775 | { | ||
1776 | int i; | ||
1777 | int err; | ||
1778 | |||
1779 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | ||
1780 | err = device_create_file(&netdev->dev, | ||
1781 | &xennet_attrs[i]); | ||
1782 | if (err) | ||
1783 | goto fail; | ||
1784 | } | ||
1785 | return 0; | ||
1786 | |||
1787 | fail: | ||
1788 | while (--i >= 0) | ||
1789 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | ||
1790 | return err; | ||
1791 | } | ||
1792 | |||
1793 | static void xennet_sysfs_delif(struct net_device *netdev) | ||
1794 | { | ||
1795 | int i; | ||
1796 | |||
1797 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | ||
1798 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | ||
1799 | } | ||
1800 | |||
1801 | #endif /* CONFIG_SYSFS */ | ||
1802 | |||
1803 | static struct xenbus_device_id netfront_ids[] = { | ||
1804 | { "vif" }, | ||
1805 | { "" } | ||
1806 | }; | ||
1807 | |||
1808 | |||
1809 | static int __devexit xennet_remove(struct xenbus_device *dev) | ||
1810 | { | ||
1811 | struct netfront_info *info = dev->dev.driver_data; | ||
1812 | |||
1813 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | ||
1814 | |||
1815 | unregister_netdev(info->netdev); | ||
1816 | |||
1817 | xennet_disconnect_backend(info); | ||
1818 | |||
1819 | del_timer_sync(&info->rx_refill_timer); | ||
1820 | |||
1821 | xennet_sysfs_delif(info->netdev); | ||
1822 | |||
1823 | free_netdev(info->netdev); | ||
1824 | |||
1825 | return 0; | ||
1826 | } | ||
1827 | |||
1828 | static struct xenbus_driver netfront = { | ||
1829 | .name = "vif", | ||
1830 | .owner = THIS_MODULE, | ||
1831 | .ids = netfront_ids, | ||
1832 | .probe = netfront_probe, | ||
1833 | .remove = __devexit_p(xennet_remove), | ||
1834 | .resume = netfront_resume, | ||
1835 | .otherend_changed = backend_changed, | ||
1836 | }; | ||
1837 | |||
1838 | static int __init netif_init(void) | ||
1839 | { | ||
1840 | if (!is_running_on_xen()) | ||
1841 | return -ENODEV; | ||
1842 | |||
1843 | if (is_initial_xendomain()) | ||
1844 | return 0; | ||
1845 | |||
1846 | printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); | ||
1847 | |||
1848 | return xenbus_register_frontend(&netfront); | ||
1849 | } | ||
1850 | module_init(netif_init); | ||
1851 | |||
1852 | |||
1853 | static void __exit netif_exit(void) | ||
1854 | { | ||
1855 | if (is_initial_xendomain()) | ||
1856 | return; | ||
1857 | |||
1858 | return xenbus_unregister_driver(&netfront); | ||
1859 | } | ||
1860 | module_exit(netif_exit); | ||
1861 | |||
1862 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | ||
1863 | MODULE_LICENSE("GPL"); | ||