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 | ||
383eda32 JP |
32 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
33 | ||
0d160211 JF |
34 | #include <linux/module.h> |
35 | #include <linux/kernel.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/etherdevice.h> | |
38 | #include <linux/skbuff.h> | |
39 | #include <linux/ethtool.h> | |
40 | #include <linux/if_ether.h> | |
9ecd1a75 | 41 | #include <net/tcp.h> |
0d160211 JF |
42 | #include <linux/udp.h> |
43 | #include <linux/moduleparam.h> | |
44 | #include <linux/mm.h> | |
5a0e3ad6 | 45 | #include <linux/slab.h> |
0d160211 JF |
46 | #include <net/ip.h> |
47 | ||
ca981633 | 48 | #include <asm/xen/page.h> |
1ccbf534 | 49 | #include <xen/xen.h> |
0d160211 JF |
50 | #include <xen/xenbus.h> |
51 | #include <xen/events.h> | |
52 | #include <xen/page.h> | |
b9136d20 | 53 | #include <xen/platform_pci.h> |
0d160211 JF |
54 | #include <xen/grant_table.h> |
55 | ||
56 | #include <xen/interface/io/netif.h> | |
57 | #include <xen/interface/memory.h> | |
58 | #include <xen/interface/grant_table.h> | |
59 | ||
0fc0b732 | 60 | static const struct ethtool_ops xennet_ethtool_ops; |
0d160211 JF |
61 | |
62 | struct netfront_cb { | |
3683243b | 63 | int pull_to; |
0d160211 JF |
64 | }; |
65 | ||
66 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) | |
67 | ||
68 | #define RX_COPY_THRESHOLD 256 | |
69 | ||
70 | #define GRANT_INVALID_REF 0 | |
71 | ||
667c78af JF |
72 | #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) |
73 | #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) | |
40206dd9 | 74 | #define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256) |
0d160211 | 75 | |
e00f85be | 76 | struct netfront_stats { |
77 | u64 rx_packets; | |
78 | u64 tx_packets; | |
79 | u64 rx_bytes; | |
80 | u64 tx_bytes; | |
81 | struct u64_stats_sync syncp; | |
82 | }; | |
83 | ||
0d160211 JF |
84 | struct netfront_info { |
85 | struct list_head list; | |
86 | struct net_device *netdev; | |
87 | ||
bea3348e | 88 | struct napi_struct napi; |
0d160211 | 89 | |
d634bf2c WL |
90 | /* Split event channels support, tx_* == rx_* when using |
91 | * single event channel. | |
92 | */ | |
93 | unsigned int tx_evtchn, rx_evtchn; | |
94 | unsigned int tx_irq, rx_irq; | |
95 | /* Only used when split event channels support is enabled */ | |
96 | char tx_irq_name[IFNAMSIZ+4]; /* DEVNAME-tx */ | |
97 | char rx_irq_name[IFNAMSIZ+4]; /* DEVNAME-rx */ | |
98 | ||
84284d3c | 99 | struct xenbus_device *xbdev; |
0d160211 | 100 | |
84284d3c JF |
101 | spinlock_t tx_lock; |
102 | struct xen_netif_tx_front_ring tx; | |
103 | int tx_ring_ref; | |
0d160211 JF |
104 | |
105 | /* | |
106 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries | |
107 | * are linked from tx_skb_freelist through skb_entry.link. | |
108 | * | |
109 | * NB. Freelist index entries are always going to be less than | |
110 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or | |
111 | * greater than PAGE_OFFSET: we use this property to distinguish | |
112 | * them. | |
113 | */ | |
114 | union skb_entry { | |
115 | struct sk_buff *skb; | |
1ffb40b8 | 116 | unsigned long link; |
0d160211 JF |
117 | } tx_skbs[NET_TX_RING_SIZE]; |
118 | grant_ref_t gref_tx_head; | |
119 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | |
120 | unsigned tx_skb_freelist; | |
121 | ||
84284d3c JF |
122 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
123 | struct xen_netif_rx_front_ring rx; | |
124 | int rx_ring_ref; | |
125 | ||
126 | /* Receive-ring batched refills. */ | |
127 | #define RX_MIN_TARGET 8 | |
128 | #define RX_DFL_MIN_TARGET 64 | |
129 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | |
130 | unsigned rx_min_target, rx_max_target, rx_target; | |
131 | struct sk_buff_head rx_batch; | |
132 | ||
133 | struct timer_list rx_refill_timer; | |
134 | ||
0d160211 JF |
135 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
136 | grant_ref_t gref_rx_head; | |
137 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; | |
138 | ||
0d160211 JF |
139 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; |
140 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; | |
141 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; | |
e0ce4af9 IC |
142 | |
143 | /* Statistics */ | |
e00f85be | 144 | struct netfront_stats __percpu *stats; |
145 | ||
e9a799ea | 146 | unsigned long rx_gso_checksum_fixup; |
0d160211 JF |
147 | }; |
148 | ||
149 | struct netfront_rx_info { | |
150 | struct xen_netif_rx_response rx; | |
151 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; | |
152 | }; | |
153 | ||
1ffb40b8 IY |
154 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
155 | { | |
156 | list->link = id; | |
157 | } | |
158 | ||
159 | static int skb_entry_is_link(const union skb_entry *list) | |
160 | { | |
161 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); | |
807540ba | 162 | return (unsigned long)list->skb < PAGE_OFFSET; |
1ffb40b8 IY |
163 | } |
164 | ||
0d160211 JF |
165 | /* |
166 | * Access macros for acquiring freeing slots in tx_skbs[]. | |
167 | */ | |
168 | ||
169 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, | |
170 | unsigned short id) | |
171 | { | |
1ffb40b8 | 172 | skb_entry_set_link(&list[id], *head); |
0d160211 JF |
173 | *head = id; |
174 | } | |
175 | ||
176 | static unsigned short get_id_from_freelist(unsigned *head, | |
177 | union skb_entry *list) | |
178 | { | |
179 | unsigned int id = *head; | |
180 | *head = list[id].link; | |
181 | return id; | |
182 | } | |
183 | ||
184 | static int xennet_rxidx(RING_IDX idx) | |
185 | { | |
186 | return idx & (NET_RX_RING_SIZE - 1); | |
187 | } | |
188 | ||
189 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, | |
190 | RING_IDX ri) | |
191 | { | |
192 | int i = xennet_rxidx(ri); | |
193 | struct sk_buff *skb = np->rx_skbs[i]; | |
194 | np->rx_skbs[i] = NULL; | |
195 | return skb; | |
196 | } | |
197 | ||
198 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, | |
199 | RING_IDX ri) | |
200 | { | |
201 | int i = xennet_rxidx(ri); | |
202 | grant_ref_t ref = np->grant_rx_ref[i]; | |
203 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
204 | return ref; | |
205 | } | |
206 | ||
207 | #ifdef CONFIG_SYSFS | |
208 | static int xennet_sysfs_addif(struct net_device *netdev); | |
209 | static void xennet_sysfs_delif(struct net_device *netdev); | |
210 | #else /* !CONFIG_SYSFS */ | |
211 | #define xennet_sysfs_addif(dev) (0) | |
212 | #define xennet_sysfs_delif(dev) do { } while (0) | |
213 | #endif | |
214 | ||
3ad9b358 | 215 | static bool xennet_can_sg(struct net_device *dev) |
0d160211 | 216 | { |
3ad9b358 | 217 | return dev->features & NETIF_F_SG; |
0d160211 JF |
218 | } |
219 | ||
220 | ||
221 | static void rx_refill_timeout(unsigned long data) | |
222 | { | |
223 | struct net_device *dev = (struct net_device *)data; | |
bea3348e | 224 | struct netfront_info *np = netdev_priv(dev); |
288379f0 | 225 | napi_schedule(&np->napi); |
0d160211 JF |
226 | } |
227 | ||
228 | static int netfront_tx_slot_available(struct netfront_info *np) | |
229 | { | |
807540ba ED |
230 | return (np->tx.req_prod_pvt - np->tx.rsp_cons) < |
231 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2); | |
0d160211 JF |
232 | } |
233 | ||
234 | static void xennet_maybe_wake_tx(struct net_device *dev) | |
235 | { | |
236 | struct netfront_info *np = netdev_priv(dev); | |
237 | ||
238 | if (unlikely(netif_queue_stopped(dev)) && | |
239 | netfront_tx_slot_available(np) && | |
240 | likely(netif_running(dev))) | |
241 | netif_wake_queue(dev); | |
242 | } | |
243 | ||
244 | static void xennet_alloc_rx_buffers(struct net_device *dev) | |
245 | { | |
246 | unsigned short id; | |
247 | struct netfront_info *np = netdev_priv(dev); | |
248 | struct sk_buff *skb; | |
249 | struct page *page; | |
250 | int i, batch_target, notify; | |
251 | RING_IDX req_prod = np->rx.req_prod_pvt; | |
0d160211 JF |
252 | grant_ref_t ref; |
253 | unsigned long pfn; | |
254 | void *vaddr; | |
0d160211 JF |
255 | struct xen_netif_rx_request *req; |
256 | ||
257 | if (unlikely(!netif_carrier_ok(dev))) | |
258 | return; | |
259 | ||
260 | /* | |
261 | * Allocate skbuffs greedily, even though we batch updates to the | |
262 | * receive ring. This creates a less bursty demand on the memory | |
263 | * allocator, so should reduce the chance of failed allocation requests | |
264 | * both for ourself and for other kernel subsystems. | |
265 | */ | |
266 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); | |
267 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { | |
617a20bb | 268 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, |
0d160211 JF |
269 | GFP_ATOMIC | __GFP_NOWARN); |
270 | if (unlikely(!skb)) | |
271 | goto no_skb; | |
272 | ||
617a20bb IY |
273 | /* Align ip header to a 16 bytes boundary */ |
274 | skb_reserve(skb, NET_IP_ALIGN); | |
275 | ||
0d160211 JF |
276 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
277 | if (!page) { | |
278 | kfree_skb(skb); | |
279 | no_skb: | |
280 | /* Any skbuffs queued for refill? Force them out. */ | |
281 | if (i != 0) | |
282 | goto refill; | |
283 | /* Could not allocate any skbuffs. Try again later. */ | |
284 | mod_timer(&np->rx_refill_timer, | |
285 | jiffies + (HZ/10)); | |
286 | break; | |
287 | } | |
288 | ||
093b9c71 | 289 | skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); |
0d160211 JF |
290 | __skb_queue_tail(&np->rx_batch, skb); |
291 | } | |
292 | ||
293 | /* Is the batch large enough to be worthwhile? */ | |
294 | if (i < (np->rx_target/2)) { | |
295 | if (req_prod > np->rx.sring->req_prod) | |
296 | goto push; | |
297 | return; | |
298 | } | |
299 | ||
300 | /* Adjust our fill target if we risked running out of buffers. */ | |
301 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && | |
302 | ((np->rx_target *= 2) > np->rx_max_target)) | |
303 | np->rx_target = np->rx_max_target; | |
304 | ||
305 | refill: | |
5dcddfae | 306 | for (i = 0; ; i++) { |
0d160211 JF |
307 | skb = __skb_dequeue(&np->rx_batch); |
308 | if (skb == NULL) | |
309 | break; | |
310 | ||
311 | skb->dev = dev; | |
312 | ||
313 | id = xennet_rxidx(req_prod + i); | |
314 | ||
315 | BUG_ON(np->rx_skbs[id]); | |
316 | np->rx_skbs[id] = skb; | |
317 | ||
318 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); | |
319 | BUG_ON((signed short)ref < 0); | |
320 | np->grant_rx_ref[id] = ref; | |
321 | ||
01c68026 IC |
322 | pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); |
323 | vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0])); | |
0d160211 JF |
324 | |
325 | req = RING_GET_REQUEST(&np->rx, req_prod + i); | |
326 | gnttab_grant_foreign_access_ref(ref, | |
327 | np->xbdev->otherend_id, | |
328 | pfn_to_mfn(pfn), | |
329 | 0); | |
330 | ||
331 | req->id = id; | |
332 | req->gref = ref; | |
333 | } | |
334 | ||
5dcddfae | 335 | wmb(); /* barrier so backend seens requests */ |
0d160211 JF |
336 | |
337 | /* Above is a suitable barrier to ensure backend will see requests. */ | |
338 | np->rx.req_prod_pvt = req_prod + i; | |
339 | push: | |
340 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); | |
341 | if (notify) | |
d634bf2c | 342 | notify_remote_via_irq(np->rx_irq); |
0d160211 JF |
343 | } |
344 | ||
345 | static int xennet_open(struct net_device *dev) | |
346 | { | |
347 | struct netfront_info *np = netdev_priv(dev); | |
348 | ||
bea3348e SH |
349 | napi_enable(&np->napi); |
350 | ||
0d160211 JF |
351 | spin_lock_bh(&np->rx_lock); |
352 | if (netif_carrier_ok(dev)) { | |
353 | xennet_alloc_rx_buffers(dev); | |
354 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; | |
355 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
288379f0 | 356 | napi_schedule(&np->napi); |
0d160211 JF |
357 | } |
358 | spin_unlock_bh(&np->rx_lock); | |
359 | ||
0b1ab1b8 | 360 | netif_start_queue(dev); |
0d160211 JF |
361 | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static void xennet_tx_buf_gc(struct net_device *dev) | |
366 | { | |
367 | RING_IDX cons, prod; | |
368 | unsigned short id; | |
369 | struct netfront_info *np = netdev_priv(dev); | |
370 | struct sk_buff *skb; | |
371 | ||
372 | BUG_ON(!netif_carrier_ok(dev)); | |
373 | ||
374 | do { | |
375 | prod = np->tx.sring->rsp_prod; | |
376 | rmb(); /* Ensure we see responses up to 'rp'. */ | |
377 | ||
378 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { | |
379 | struct xen_netif_tx_response *txrsp; | |
380 | ||
381 | txrsp = RING_GET_RESPONSE(&np->tx, cons); | |
f942dc25 | 382 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
0d160211 JF |
383 | continue; |
384 | ||
385 | id = txrsp->id; | |
386 | skb = np->tx_skbs[id].skb; | |
387 | if (unlikely(gnttab_query_foreign_access( | |
388 | np->grant_tx_ref[id]) != 0)) { | |
383eda32 JP |
389 | pr_alert("%s: warning -- grant still in use by backend domain\n", |
390 | __func__); | |
0d160211 JF |
391 | BUG(); |
392 | } | |
393 | gnttab_end_foreign_access_ref( | |
394 | np->grant_tx_ref[id], GNTMAP_readonly); | |
395 | gnttab_release_grant_reference( | |
396 | &np->gref_tx_head, np->grant_tx_ref[id]); | |
397 | np->grant_tx_ref[id] = GRANT_INVALID_REF; | |
398 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); | |
399 | dev_kfree_skb_irq(skb); | |
400 | } | |
401 | ||
402 | np->tx.rsp_cons = prod; | |
403 | ||
404 | /* | |
405 | * Set a new event, then check for race with update of tx_cons. | |
406 | * Note that it is essential to schedule a callback, no matter | |
407 | * how few buffers are pending. Even if there is space in the | |
408 | * transmit ring, higher layers may be blocked because too much | |
409 | * data is outstanding: in such cases notification from Xen is | |
410 | * likely to be the only kick that we'll get. | |
411 | */ | |
412 | np->tx.sring->rsp_event = | |
413 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; | |
414 | mb(); /* update shared area */ | |
415 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); | |
416 | ||
417 | xennet_maybe_wake_tx(dev); | |
418 | } | |
419 | ||
420 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, | |
421 | struct xen_netif_tx_request *tx) | |
422 | { | |
423 | struct netfront_info *np = netdev_priv(dev); | |
424 | char *data = skb->data; | |
425 | unsigned long mfn; | |
426 | RING_IDX prod = np->tx.req_prod_pvt; | |
427 | int frags = skb_shinfo(skb)->nr_frags; | |
428 | unsigned int offset = offset_in_page(data); | |
429 | unsigned int len = skb_headlen(skb); | |
430 | unsigned int id; | |
431 | grant_ref_t ref; | |
432 | int i; | |
433 | ||
434 | /* While the header overlaps a page boundary (including being | |
435 | larger than a page), split it it into page-sized chunks. */ | |
436 | while (len > PAGE_SIZE - offset) { | |
437 | tx->size = PAGE_SIZE - offset; | |
f942dc25 | 438 | tx->flags |= XEN_NETTXF_more_data; |
0d160211 JF |
439 | len -= tx->size; |
440 | data += tx->size; | |
441 | offset = 0; | |
442 | ||
443 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
444 | np->tx_skbs[id].skb = skb_get(skb); | |
445 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
446 | tx->id = id; | |
447 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
448 | BUG_ON((signed short)ref < 0); | |
449 | ||
450 | mfn = virt_to_mfn(data); | |
451 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
452 | mfn, GNTMAP_readonly); | |
453 | ||
454 | tx->gref = np->grant_tx_ref[id] = ref; | |
455 | tx->offset = offset; | |
456 | tx->size = len; | |
457 | tx->flags = 0; | |
458 | } | |
459 | ||
460 | /* Grant backend access to each skb fragment page. */ | |
461 | for (i = 0; i < frags; i++) { | |
462 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
f36c3747 | 463 | struct page *page = skb_frag_page(frag); |
0d160211 | 464 | |
f36c3747 IC |
465 | len = skb_frag_size(frag); |
466 | offset = frag->page_offset; | |
0d160211 | 467 | |
f36c3747 IC |
468 | /* Data must not cross a page boundary. */ |
469 | BUG_ON(len + offset > PAGE_SIZE<<compound_order(page)); | |
0d160211 | 470 | |
f36c3747 IC |
471 | /* Skip unused frames from start of page */ |
472 | page += offset >> PAGE_SHIFT; | |
473 | offset &= ~PAGE_MASK; | |
0d160211 | 474 | |
f36c3747 IC |
475 | while (len > 0) { |
476 | unsigned long bytes; | |
477 | ||
478 | BUG_ON(offset >= PAGE_SIZE); | |
479 | ||
480 | bytes = PAGE_SIZE - offset; | |
481 | if (bytes > len) | |
482 | bytes = len; | |
483 | ||
484 | tx->flags |= XEN_NETTXF_more_data; | |
485 | ||
486 | id = get_id_from_freelist(&np->tx_skb_freelist, | |
487 | np->tx_skbs); | |
488 | np->tx_skbs[id].skb = skb_get(skb); | |
489 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
490 | tx->id = id; | |
491 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
492 | BUG_ON((signed short)ref < 0); | |
493 | ||
494 | mfn = pfn_to_mfn(page_to_pfn(page)); | |
495 | gnttab_grant_foreign_access_ref(ref, | |
496 | np->xbdev->otherend_id, | |
497 | mfn, GNTMAP_readonly); | |
498 | ||
499 | tx->gref = np->grant_tx_ref[id] = ref; | |
500 | tx->offset = offset; | |
501 | tx->size = bytes; | |
502 | tx->flags = 0; | |
503 | ||
504 | offset += bytes; | |
505 | len -= bytes; | |
506 | ||
507 | /* Next frame */ | |
508 | if (offset == PAGE_SIZE && len) { | |
509 | BUG_ON(!PageCompound(page)); | |
510 | page++; | |
511 | offset = 0; | |
512 | } | |
513 | } | |
0d160211 JF |
514 | } |
515 | ||
516 | np->tx.req_prod_pvt = prod; | |
517 | } | |
518 | ||
f36c3747 IC |
519 | /* |
520 | * Count how many ring slots are required to send the frags of this | |
521 | * skb. Each frag might be a compound page. | |
522 | */ | |
523 | static int xennet_count_skb_frag_slots(struct sk_buff *skb) | |
524 | { | |
525 | int i, frags = skb_shinfo(skb)->nr_frags; | |
526 | int pages = 0; | |
527 | ||
528 | for (i = 0; i < frags; i++) { | |
529 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
530 | unsigned long size = skb_frag_size(frag); | |
531 | unsigned long offset = frag->page_offset; | |
532 | ||
533 | /* Skip unused frames from start of page */ | |
534 | offset &= ~PAGE_MASK; | |
535 | ||
536 | pages += PFN_UP(offset + size); | |
537 | } | |
538 | ||
539 | return pages; | |
540 | } | |
541 | ||
0d160211 JF |
542 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
543 | { | |
544 | unsigned short id; | |
545 | struct netfront_info *np = netdev_priv(dev); | |
e00f85be | 546 | struct netfront_stats *stats = this_cpu_ptr(np->stats); |
0d160211 | 547 | struct xen_netif_tx_request *tx; |
0d160211 JF |
548 | char *data = skb->data; |
549 | RING_IDX i; | |
550 | grant_ref_t ref; | |
551 | unsigned long mfn; | |
552 | int notify; | |
f36c3747 | 553 | int slots; |
0d160211 JF |
554 | unsigned int offset = offset_in_page(data); |
555 | unsigned int len = skb_headlen(skb); | |
cf66f9d4 | 556 | unsigned long flags; |
0d160211 | 557 | |
9ecd1a75 WL |
558 | /* If skb->len is too big for wire format, drop skb and alert |
559 | * user about misconfiguration. | |
560 | */ | |
561 | if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { | |
562 | net_alert_ratelimited( | |
563 | "xennet: skb->len = %u, too big for wire format\n", | |
564 | skb->len); | |
565 | goto drop; | |
566 | } | |
567 | ||
f36c3747 IC |
568 | slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) + |
569 | xennet_count_skb_frag_slots(skb); | |
570 | if (unlikely(slots > MAX_SKB_FRAGS + 1)) { | |
571 | net_alert_ratelimited( | |
572 | "xennet: skb rides the rocket: %d slots\n", slots); | |
0d160211 JF |
573 | goto drop; |
574 | } | |
575 | ||
cf66f9d4 | 576 | spin_lock_irqsave(&np->tx_lock, flags); |
0d160211 JF |
577 | |
578 | if (unlikely(!netif_carrier_ok(dev) || | |
f36c3747 | 579 | (slots > 1 && !xennet_can_sg(dev)) || |
fc741216 | 580 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
cf66f9d4 | 581 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 JF |
582 | goto drop; |
583 | } | |
584 | ||
585 | i = np->tx.req_prod_pvt; | |
586 | ||
587 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
588 | np->tx_skbs[id].skb = skb; | |
589 | ||
590 | tx = RING_GET_REQUEST(&np->tx, i); | |
591 | ||
592 | tx->id = id; | |
593 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
594 | BUG_ON((signed short)ref < 0); | |
595 | mfn = virt_to_mfn(data); | |
596 | gnttab_grant_foreign_access_ref( | |
597 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | |
598 | tx->gref = np->grant_tx_ref[id] = ref; | |
599 | tx->offset = offset; | |
600 | tx->size = len; | |
0d160211 JF |
601 | |
602 | tx->flags = 0; | |
603 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
604 | /* local packet? */ | |
f942dc25 | 605 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
0d160211 JF |
606 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
607 | /* remote but checksummed. */ | |
f942dc25 | 608 | tx->flags |= XEN_NETTXF_data_validated; |
0d160211 JF |
609 | |
610 | if (skb_shinfo(skb)->gso_size) { | |
611 | struct xen_netif_extra_info *gso; | |
612 | ||
613 | gso = (struct xen_netif_extra_info *) | |
614 | RING_GET_REQUEST(&np->tx, ++i); | |
615 | ||
e2d617c0 | 616 | tx->flags |= XEN_NETTXF_extra_info; |
0d160211 JF |
617 | |
618 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
619 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; | |
620 | gso->u.gso.pad = 0; | |
621 | gso->u.gso.features = 0; | |
622 | ||
623 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
624 | gso->flags = 0; | |
0d160211 JF |
625 | } |
626 | ||
627 | np->tx.req_prod_pvt = i + 1; | |
628 | ||
629 | xennet_make_frags(skb, dev, tx); | |
630 | tx->size = skb->len; | |
631 | ||
632 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | |
633 | if (notify) | |
d634bf2c | 634 | notify_remote_via_irq(np->tx_irq); |
0d160211 | 635 | |
e00f85be | 636 | u64_stats_update_begin(&stats->syncp); |
637 | stats->tx_bytes += skb->len; | |
638 | stats->tx_packets++; | |
639 | u64_stats_update_end(&stats->syncp); | |
10a273a6 JF |
640 | |
641 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
0d160211 JF |
642 | xennet_tx_buf_gc(dev); |
643 | ||
644 | if (!netfront_tx_slot_available(np)) | |
645 | netif_stop_queue(dev); | |
646 | ||
cf66f9d4 | 647 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 | 648 | |
6ed10654 | 649 | return NETDEV_TX_OK; |
0d160211 JF |
650 | |
651 | drop: | |
09f75cd7 | 652 | dev->stats.tx_dropped++; |
0d160211 | 653 | dev_kfree_skb(skb); |
6ed10654 | 654 | return NETDEV_TX_OK; |
0d160211 JF |
655 | } |
656 | ||
657 | static int xennet_close(struct net_device *dev) | |
658 | { | |
659 | struct netfront_info *np = netdev_priv(dev); | |
660 | netif_stop_queue(np->netdev); | |
bea3348e | 661 | napi_disable(&np->napi); |
0d160211 JF |
662 | return 0; |
663 | } | |
664 | ||
0d160211 JF |
665 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
666 | grant_ref_t ref) | |
667 | { | |
668 | int new = xennet_rxidx(np->rx.req_prod_pvt); | |
669 | ||
670 | BUG_ON(np->rx_skbs[new]); | |
671 | np->rx_skbs[new] = skb; | |
672 | np->grant_rx_ref[new] = ref; | |
673 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | |
674 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | |
675 | np->rx.req_prod_pvt++; | |
676 | } | |
677 | ||
678 | static int xennet_get_extras(struct netfront_info *np, | |
679 | struct xen_netif_extra_info *extras, | |
680 | RING_IDX rp) | |
681 | ||
682 | { | |
683 | struct xen_netif_extra_info *extra; | |
684 | struct device *dev = &np->netdev->dev; | |
685 | RING_IDX cons = np->rx.rsp_cons; | |
686 | int err = 0; | |
687 | ||
688 | do { | |
689 | struct sk_buff *skb; | |
690 | grant_ref_t ref; | |
691 | ||
692 | if (unlikely(cons + 1 == rp)) { | |
693 | if (net_ratelimit()) | |
694 | dev_warn(dev, "Missing extra info\n"); | |
695 | err = -EBADR; | |
696 | break; | |
697 | } | |
698 | ||
699 | extra = (struct xen_netif_extra_info *) | |
700 | RING_GET_RESPONSE(&np->rx, ++cons); | |
701 | ||
702 | if (unlikely(!extra->type || | |
703 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
704 | if (net_ratelimit()) | |
705 | dev_warn(dev, "Invalid extra type: %d\n", | |
706 | extra->type); | |
707 | err = -EINVAL; | |
708 | } else { | |
709 | memcpy(&extras[extra->type - 1], extra, | |
710 | sizeof(*extra)); | |
711 | } | |
712 | ||
713 | skb = xennet_get_rx_skb(np, cons); | |
714 | ref = xennet_get_rx_ref(np, cons); | |
715 | xennet_move_rx_slot(np, skb, ref); | |
716 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | |
717 | ||
718 | np->rx.rsp_cons = cons; | |
719 | return err; | |
720 | } | |
721 | ||
722 | static int xennet_get_responses(struct netfront_info *np, | |
723 | struct netfront_rx_info *rinfo, RING_IDX rp, | |
724 | struct sk_buff_head *list) | |
725 | { | |
726 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
727 | struct xen_netif_extra_info *extras = rinfo->extras; | |
728 | struct device *dev = &np->netdev->dev; | |
729 | RING_IDX cons = np->rx.rsp_cons; | |
730 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | |
731 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | |
732 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | |
7158ff6d | 733 | int slots = 1; |
0d160211 JF |
734 | int err = 0; |
735 | unsigned long ret; | |
736 | ||
f942dc25 | 737 | if (rx->flags & XEN_NETRXF_extra_info) { |
0d160211 JF |
738 | err = xennet_get_extras(np, extras, rp); |
739 | cons = np->rx.rsp_cons; | |
740 | } | |
741 | ||
742 | for (;;) { | |
743 | if (unlikely(rx->status < 0 || | |
744 | rx->offset + rx->status > PAGE_SIZE)) { | |
745 | if (net_ratelimit()) | |
746 | dev_warn(dev, "rx->offset: %x, size: %u\n", | |
747 | rx->offset, rx->status); | |
748 | xennet_move_rx_slot(np, skb, ref); | |
749 | err = -EINVAL; | |
750 | goto next; | |
751 | } | |
752 | ||
753 | /* | |
754 | * This definitely indicates a bug, either in this driver or in | |
755 | * the backend driver. In future this should flag the bad | |
697089dc | 756 | * situation to the system controller to reboot the backend. |
0d160211 JF |
757 | */ |
758 | if (ref == GRANT_INVALID_REF) { | |
759 | if (net_ratelimit()) | |
760 | dev_warn(dev, "Bad rx response id %d.\n", | |
761 | rx->id); | |
762 | err = -EINVAL; | |
763 | goto next; | |
764 | } | |
765 | ||
766 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
767 | BUG_ON(!ret); | |
768 | ||
769 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
770 | ||
771 | __skb_queue_tail(list, skb); | |
772 | ||
773 | next: | |
f942dc25 | 774 | if (!(rx->flags & XEN_NETRXF_more_data)) |
0d160211 JF |
775 | break; |
776 | ||
7158ff6d | 777 | if (cons + slots == rp) { |
0d160211 | 778 | if (net_ratelimit()) |
7158ff6d | 779 | dev_warn(dev, "Need more slots\n"); |
0d160211 JF |
780 | err = -ENOENT; |
781 | break; | |
782 | } | |
783 | ||
7158ff6d WL |
784 | rx = RING_GET_RESPONSE(&np->rx, cons + slots); |
785 | skb = xennet_get_rx_skb(np, cons + slots); | |
786 | ref = xennet_get_rx_ref(np, cons + slots); | |
787 | slots++; | |
0d160211 JF |
788 | } |
789 | ||
7158ff6d | 790 | if (unlikely(slots > max)) { |
0d160211 | 791 | if (net_ratelimit()) |
697089dc | 792 | dev_warn(dev, "Too many slots\n"); |
0d160211 JF |
793 | err = -E2BIG; |
794 | } | |
795 | ||
796 | if (unlikely(err)) | |
7158ff6d | 797 | np->rx.rsp_cons = cons + slots; |
0d160211 JF |
798 | |
799 | return err; | |
800 | } | |
801 | ||
802 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
803 | struct xen_netif_extra_info *gso) | |
804 | { | |
805 | if (!gso->u.gso.size) { | |
806 | if (net_ratelimit()) | |
383eda32 | 807 | pr_warn("GSO size must not be zero\n"); |
0d160211 JF |
808 | return -EINVAL; |
809 | } | |
810 | ||
811 | /* Currently only TCPv4 S.O. is supported. */ | |
812 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { | |
813 | if (net_ratelimit()) | |
383eda32 | 814 | pr_warn("Bad GSO type %d\n", gso->u.gso.type); |
0d160211 JF |
815 | return -EINVAL; |
816 | } | |
817 | ||
818 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
819 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
820 | ||
821 | /* Header must be checked, and gso_segs computed. */ | |
822 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
823 | skb_shinfo(skb)->gso_segs = 0; | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | |
829 | struct sk_buff *skb, | |
830 | struct sk_buff_head *list) | |
831 | { | |
832 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
0d160211 | 833 | RING_IDX cons = np->rx.rsp_cons; |
0d160211 JF |
834 | struct sk_buff *nskb; |
835 | ||
836 | while ((nskb = __skb_dequeue(list))) { | |
837 | struct xen_netif_rx_response *rx = | |
838 | RING_GET_RESPONSE(&np->rx, ++cons); | |
01c68026 | 839 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
0d160211 | 840 | |
093b9c71 JB |
841 | if (shinfo->nr_frags == MAX_SKB_FRAGS) { |
842 | unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; | |
0d160211 | 843 | |
093b9c71 JB |
844 | BUG_ON(pull_to <= skb_headlen(skb)); |
845 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
846 | } | |
847 | BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS); | |
848 | ||
849 | skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag), | |
850 | rx->offset, rx->status, PAGE_SIZE); | |
0d160211 JF |
851 | |
852 | skb_shinfo(nskb)->nr_frags = 0; | |
853 | kfree_skb(nskb); | |
0d160211 JF |
854 | } |
855 | ||
0d160211 JF |
856 | return cons; |
857 | } | |
858 | ||
e0ce4af9 | 859 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
0d160211 JF |
860 | { |
861 | struct iphdr *iph; | |
0d160211 | 862 | int err = -EPROTO; |
e0ce4af9 IC |
863 | int recalculate_partial_csum = 0; |
864 | ||
865 | /* | |
866 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
867 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
868 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
869 | * recalculate the partial checksum. | |
870 | */ | |
871 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
872 | struct netfront_info *np = netdev_priv(dev); | |
873 | np->rx_gso_checksum_fixup++; | |
874 | skb->ip_summed = CHECKSUM_PARTIAL; | |
875 | recalculate_partial_csum = 1; | |
876 | } | |
877 | ||
878 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
879 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
880 | return 0; | |
0d160211 JF |
881 | |
882 | if (skb->protocol != htons(ETH_P_IP)) | |
883 | goto out; | |
884 | ||
885 | iph = (void *)skb->data; | |
0d160211 | 886 | |
0d160211 JF |
887 | switch (iph->protocol) { |
888 | case IPPROTO_TCP: | |
8249152c LR |
889 | if (!skb_partial_csum_set(skb, 4 * iph->ihl, |
890 | offsetof(struct tcphdr, check))) | |
891 | goto out; | |
e0ce4af9 IC |
892 | |
893 | if (recalculate_partial_csum) { | |
8249152c | 894 | struct tcphdr *tcph = tcp_hdr(skb); |
e0ce4af9 IC |
895 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, |
896 | skb->len - iph->ihl*4, | |
897 | IPPROTO_TCP, 0); | |
898 | } | |
0d160211 JF |
899 | break; |
900 | case IPPROTO_UDP: | |
8249152c LR |
901 | if (!skb_partial_csum_set(skb, 4 * iph->ihl, |
902 | offsetof(struct udphdr, check))) | |
903 | goto out; | |
e0ce4af9 IC |
904 | |
905 | if (recalculate_partial_csum) { | |
8249152c | 906 | struct udphdr *udph = udp_hdr(skb); |
e0ce4af9 IC |
907 | udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, |
908 | skb->len - iph->ihl*4, | |
909 | IPPROTO_UDP, 0); | |
910 | } | |
0d160211 JF |
911 | break; |
912 | default: | |
913 | if (net_ratelimit()) | |
383eda32 JP |
914 | pr_err("Attempting to checksum a non-TCP/UDP packet, dropping a protocol %d packet\n", |
915 | iph->protocol); | |
0d160211 JF |
916 | goto out; |
917 | } | |
918 | ||
0d160211 JF |
919 | err = 0; |
920 | ||
921 | out: | |
922 | return err; | |
923 | } | |
924 | ||
925 | static int handle_incoming_queue(struct net_device *dev, | |
09f75cd7 | 926 | struct sk_buff_head *rxq) |
0d160211 | 927 | { |
e00f85be | 928 | struct netfront_info *np = netdev_priv(dev); |
929 | struct netfront_stats *stats = this_cpu_ptr(np->stats); | |
0d160211 JF |
930 | int packets_dropped = 0; |
931 | struct sk_buff *skb; | |
932 | ||
933 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
3683243b | 934 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
0d160211 | 935 | |
093b9c71 JB |
936 | if (pull_to > skb_headlen(skb)) |
937 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
0d160211 JF |
938 | |
939 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
940 | skb->protocol = eth_type_trans(skb, dev); | |
941 | ||
e0ce4af9 IC |
942 | if (checksum_setup(dev, skb)) { |
943 | kfree_skb(skb); | |
944 | packets_dropped++; | |
945 | dev->stats.rx_errors++; | |
946 | continue; | |
0d160211 JF |
947 | } |
948 | ||
e00f85be | 949 | u64_stats_update_begin(&stats->syncp); |
950 | stats->rx_packets++; | |
951 | stats->rx_bytes += skb->len; | |
952 | u64_stats_update_end(&stats->syncp); | |
0d160211 JF |
953 | |
954 | /* Pass it up. */ | |
955 | netif_receive_skb(skb); | |
0d160211 JF |
956 | } |
957 | ||
958 | return packets_dropped; | |
959 | } | |
960 | ||
bea3348e | 961 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 962 | { |
bea3348e SH |
963 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
964 | struct net_device *dev = np->netdev; | |
0d160211 JF |
965 | struct sk_buff *skb; |
966 | struct netfront_rx_info rinfo; | |
967 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
968 | struct xen_netif_extra_info *extras = rinfo.extras; | |
969 | RING_IDX i, rp; | |
bea3348e | 970 | int work_done; |
0d160211 JF |
971 | struct sk_buff_head rxq; |
972 | struct sk_buff_head errq; | |
973 | struct sk_buff_head tmpq; | |
974 | unsigned long flags; | |
0d160211 JF |
975 | int err; |
976 | ||
977 | spin_lock(&np->rx_lock); | |
978 | ||
0d160211 JF |
979 | skb_queue_head_init(&rxq); |
980 | skb_queue_head_init(&errq); | |
981 | skb_queue_head_init(&tmpq); | |
982 | ||
0d160211 JF |
983 | rp = np->rx.sring->rsp_prod; |
984 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | |
985 | ||
986 | i = np->rx.rsp_cons; | |
987 | work_done = 0; | |
988 | while ((i != rp) && (work_done < budget)) { | |
989 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | |
990 | memset(extras, 0, sizeof(rinfo.extras)); | |
991 | ||
992 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | |
993 | ||
994 | if (unlikely(err)) { | |
995 | err: | |
996 | while ((skb = __skb_dequeue(&tmpq))) | |
997 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 998 | dev->stats.rx_errors++; |
0d160211 JF |
999 | i = np->rx.rsp_cons; |
1000 | continue; | |
1001 | } | |
1002 | ||
1003 | skb = __skb_dequeue(&tmpq); | |
1004 | ||
1005 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
1006 | struct xen_netif_extra_info *gso; | |
1007 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
1008 | ||
1009 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
1010 | __skb_queue_head(&tmpq, skb); | |
1011 | np->rx.rsp_cons += skb_queue_len(&tmpq); | |
1012 | goto err; | |
1013 | } | |
1014 | } | |
1015 | ||
3683243b IC |
1016 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
1017 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) | |
1018 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; | |
0d160211 | 1019 | |
3683243b IC |
1020 | skb_shinfo(skb)->frags[0].page_offset = rx->offset; |
1021 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); | |
1022 | skb->data_len = rx->status; | |
093b9c71 | 1023 | skb->len += rx->status; |
0d160211 JF |
1024 | |
1025 | i = xennet_fill_frags(np, skb, &tmpq); | |
1026 | ||
f942dc25 | 1027 | if (rx->flags & XEN_NETRXF_csum_blank) |
0d160211 | 1028 | skb->ip_summed = CHECKSUM_PARTIAL; |
f942dc25 | 1029 | else if (rx->flags & XEN_NETRXF_data_validated) |
0d160211 JF |
1030 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1031 | ||
1032 | __skb_queue_tail(&rxq, skb); | |
1033 | ||
1034 | np->rx.rsp_cons = ++i; | |
1035 | work_done++; | |
1036 | } | |
1037 | ||
56cfe5d0 | 1038 | __skb_queue_purge(&errq); |
0d160211 JF |
1039 | |
1040 | work_done -= handle_incoming_queue(dev, &rxq); | |
1041 | ||
1042 | /* If we get a callback with very few responses, reduce fill target. */ | |
1043 | /* NB. Note exponential increase, linear decrease. */ | |
1044 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > | |
1045 | ((3*np->rx_target) / 4)) && | |
1046 | (--np->rx_target < np->rx_min_target)) | |
1047 | np->rx_target = np->rx_min_target; | |
1048 | ||
1049 | xennet_alloc_rx_buffers(dev); | |
1050 | ||
0d160211 | 1051 | if (work_done < budget) { |
bea3348e SH |
1052 | int more_to_do = 0; |
1053 | ||
0d160211 JF |
1054 | local_irq_save(flags); |
1055 | ||
1056 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | |
1057 | if (!more_to_do) | |
288379f0 | 1058 | __napi_complete(napi); |
0d160211 JF |
1059 | |
1060 | local_irq_restore(flags); | |
1061 | } | |
1062 | ||
1063 | spin_unlock(&np->rx_lock); | |
1064 | ||
bea3348e | 1065 | return work_done; |
0d160211 JF |
1066 | } |
1067 | ||
1068 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
1069 | { | |
9ecd1a75 WL |
1070 | int max = xennet_can_sg(dev) ? |
1071 | XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER : ETH_DATA_LEN; | |
0d160211 JF |
1072 | |
1073 | if (mtu > max) | |
1074 | return -EINVAL; | |
1075 | dev->mtu = mtu; | |
1076 | return 0; | |
1077 | } | |
1078 | ||
e00f85be | 1079 | static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, |
1080 | struct rtnl_link_stats64 *tot) | |
1081 | { | |
1082 | struct netfront_info *np = netdev_priv(dev); | |
1083 | int cpu; | |
1084 | ||
1085 | for_each_possible_cpu(cpu) { | |
1086 | struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu); | |
1087 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; | |
1088 | unsigned int start; | |
1089 | ||
1090 | do { | |
1091 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
1092 | ||
1093 | rx_packets = stats->rx_packets; | |
1094 | tx_packets = stats->tx_packets; | |
1095 | rx_bytes = stats->rx_bytes; | |
1096 | tx_bytes = stats->tx_bytes; | |
1097 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); | |
1098 | ||
1099 | tot->rx_packets += rx_packets; | |
1100 | tot->tx_packets += tx_packets; | |
1101 | tot->rx_bytes += rx_bytes; | |
1102 | tot->tx_bytes += tx_bytes; | |
1103 | } | |
1104 | ||
1105 | tot->rx_errors = dev->stats.rx_errors; | |
1106 | tot->tx_dropped = dev->stats.tx_dropped; | |
1107 | ||
1108 | return tot; | |
1109 | } | |
1110 | ||
0d160211 JF |
1111 | static void xennet_release_tx_bufs(struct netfront_info *np) |
1112 | { | |
1113 | struct sk_buff *skb; | |
1114 | int i; | |
1115 | ||
1116 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1117 | /* Skip over entries which are actually freelist references */ | |
1ffb40b8 | 1118 | if (skb_entry_is_link(&np->tx_skbs[i])) |
0d160211 JF |
1119 | continue; |
1120 | ||
1121 | skb = np->tx_skbs[i].skb; | |
1122 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], | |
1123 | GNTMAP_readonly); | |
1124 | gnttab_release_grant_reference(&np->gref_tx_head, | |
1125 | np->grant_tx_ref[i]); | |
1126 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1127 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | |
1128 | dev_kfree_skb_irq(skb); | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | static void xennet_release_rx_bufs(struct netfront_info *np) | |
1133 | { | |
1134 | struct mmu_update *mmu = np->rx_mmu; | |
1135 | struct multicall_entry *mcl = np->rx_mcl; | |
1136 | struct sk_buff_head free_list; | |
1137 | struct sk_buff *skb; | |
1138 | unsigned long mfn; | |
1139 | int xfer = 0, noxfer = 0, unused = 0; | |
1140 | int id, ref; | |
1141 | ||
1142 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", | |
1143 | __func__); | |
1144 | return; | |
1145 | ||
1146 | skb_queue_head_init(&free_list); | |
1147 | ||
1148 | spin_lock_bh(&np->rx_lock); | |
1149 | ||
1150 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
1151 | ref = np->grant_rx_ref[id]; | |
1152 | if (ref == GRANT_INVALID_REF) { | |
1153 | unused++; | |
1154 | continue; | |
1155 | } | |
1156 | ||
1157 | skb = np->rx_skbs[id]; | |
1158 | mfn = gnttab_end_foreign_transfer_ref(ref); | |
1159 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
1160 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | |
1161 | ||
1162 | if (0 == mfn) { | |
1163 | skb_shinfo(skb)->nr_frags = 0; | |
1164 | dev_kfree_skb(skb); | |
1165 | noxfer++; | |
1166 | continue; | |
1167 | } | |
1168 | ||
1169 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1170 | /* Remap the page. */ | |
01c68026 IC |
1171 | const struct page *page = |
1172 | skb_frag_page(&skb_shinfo(skb)->frags[0]); | |
0d160211 JF |
1173 | unsigned long pfn = page_to_pfn(page); |
1174 | void *vaddr = page_address(page); | |
1175 | ||
1176 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, | |
1177 | mfn_pte(mfn, PAGE_KERNEL), | |
1178 | 0); | |
1179 | mcl++; | |
1180 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) | |
1181 | | MMU_MACHPHYS_UPDATE; | |
1182 | mmu->val = pfn; | |
1183 | mmu++; | |
1184 | ||
1185 | set_phys_to_machine(pfn, mfn); | |
1186 | } | |
1187 | __skb_queue_tail(&free_list, skb); | |
1188 | xfer++; | |
1189 | } | |
1190 | ||
1191 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", | |
1192 | __func__, xfer, noxfer, unused); | |
1193 | ||
1194 | if (xfer) { | |
1195 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1196 | /* Do all the remapping work and M2P updates. */ | |
1197 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, | |
79ea13ce | 1198 | NULL, DOMID_SELF); |
0d160211 JF |
1199 | mcl++; |
1200 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); | |
1201 | } | |
1202 | } | |
1203 | ||
56cfe5d0 | 1204 | __skb_queue_purge(&free_list); |
0d160211 JF |
1205 | |
1206 | spin_unlock_bh(&np->rx_lock); | |
1207 | } | |
1208 | ||
1209 | static void xennet_uninit(struct net_device *dev) | |
1210 | { | |
1211 | struct netfront_info *np = netdev_priv(dev); | |
1212 | xennet_release_tx_bufs(np); | |
1213 | xennet_release_rx_bufs(np); | |
1214 | gnttab_free_grant_references(np->gref_tx_head); | |
1215 | gnttab_free_grant_references(np->gref_rx_head); | |
1216 | } | |
1217 | ||
c8f44aff MM |
1218 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
1219 | netdev_features_t features) | |
8f7b01a1 ED |
1220 | { |
1221 | struct netfront_info *np = netdev_priv(dev); | |
1222 | int val; | |
1223 | ||
1224 | if (features & NETIF_F_SG) { | |
1225 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | |
1226 | "%d", &val) < 0) | |
1227 | val = 0; | |
1228 | ||
1229 | if (!val) | |
1230 | features &= ~NETIF_F_SG; | |
1231 | } | |
1232 | ||
1233 | if (features & NETIF_F_TSO) { | |
1234 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1235 | "feature-gso-tcpv4", "%d", &val) < 0) | |
1236 | val = 0; | |
1237 | ||
1238 | if (!val) | |
1239 | features &= ~NETIF_F_TSO; | |
1240 | } | |
1241 | ||
1242 | return features; | |
1243 | } | |
1244 | ||
c8f44aff MM |
1245 | static int xennet_set_features(struct net_device *dev, |
1246 | netdev_features_t features) | |
8f7b01a1 ED |
1247 | { |
1248 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { | |
1249 | netdev_info(dev, "Reducing MTU because no SG offload"); | |
1250 | dev->mtu = ETH_DATA_LEN; | |
1251 | } | |
1252 | ||
1253 | return 0; | |
1254 | } | |
1255 | ||
d634bf2c | 1256 | static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) |
cf66f9d4 | 1257 | { |
d634bf2c WL |
1258 | struct netfront_info *np = dev_id; |
1259 | struct net_device *dev = np->netdev; | |
cf66f9d4 KRW |
1260 | unsigned long flags; |
1261 | ||
1262 | spin_lock_irqsave(&np->tx_lock, flags); | |
d634bf2c WL |
1263 | xennet_tx_buf_gc(dev); |
1264 | spin_unlock_irqrestore(&np->tx_lock, flags); | |
cf66f9d4 | 1265 | |
d634bf2c WL |
1266 | return IRQ_HANDLED; |
1267 | } | |
1268 | ||
1269 | static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) | |
1270 | { | |
1271 | struct netfront_info *np = dev_id; | |
1272 | struct net_device *dev = np->netdev; | |
1273 | ||
1274 | if (likely(netif_carrier_ok(dev) && | |
1275 | RING_HAS_UNCONSUMED_RESPONSES(&np->rx))) | |
cf66f9d4 | 1276 | napi_schedule(&np->napi); |
cf66f9d4 | 1277 | |
d634bf2c WL |
1278 | return IRQ_HANDLED; |
1279 | } | |
cf66f9d4 | 1280 | |
d634bf2c WL |
1281 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
1282 | { | |
1283 | xennet_tx_interrupt(irq, dev_id); | |
1284 | xennet_rx_interrupt(irq, dev_id); | |
cf66f9d4 KRW |
1285 | return IRQ_HANDLED; |
1286 | } | |
1287 | ||
1288 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1289 | static void xennet_poll_controller(struct net_device *dev) | |
1290 | { | |
1291 | xennet_interrupt(0, dev); | |
1292 | } | |
1293 | #endif | |
1294 | ||
0a0b9d2e SH |
1295 | static const struct net_device_ops xennet_netdev_ops = { |
1296 | .ndo_open = xennet_open, | |
1297 | .ndo_uninit = xennet_uninit, | |
1298 | .ndo_stop = xennet_close, | |
1299 | .ndo_start_xmit = xennet_start_xmit, | |
1300 | .ndo_change_mtu = xennet_change_mtu, | |
e00f85be | 1301 | .ndo_get_stats64 = xennet_get_stats64, |
0a0b9d2e SH |
1302 | .ndo_set_mac_address = eth_mac_addr, |
1303 | .ndo_validate_addr = eth_validate_addr, | |
fb507934 MM |
1304 | .ndo_fix_features = xennet_fix_features, |
1305 | .ndo_set_features = xennet_set_features, | |
cf66f9d4 KRW |
1306 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1307 | .ndo_poll_controller = xennet_poll_controller, | |
1308 | #endif | |
0a0b9d2e SH |
1309 | }; |
1310 | ||
8e0e46bb | 1311 | static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
0d160211 JF |
1312 | { |
1313 | int i, err; | |
1314 | struct net_device *netdev; | |
1315 | struct netfront_info *np; | |
1316 | ||
1317 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | |
41de8d4c | 1318 | if (!netdev) |
0d160211 | 1319 | return ERR_PTR(-ENOMEM); |
0d160211 JF |
1320 | |
1321 | np = netdev_priv(netdev); | |
1322 | np->xbdev = dev; | |
1323 | ||
1324 | spin_lock_init(&np->tx_lock); | |
1325 | spin_lock_init(&np->rx_lock); | |
1326 | ||
1327 | skb_queue_head_init(&np->rx_batch); | |
1328 | np->rx_target = RX_DFL_MIN_TARGET; | |
1329 | np->rx_min_target = RX_DFL_MIN_TARGET; | |
1330 | np->rx_max_target = RX_MAX_TARGET; | |
1331 | ||
1332 | init_timer(&np->rx_refill_timer); | |
1333 | np->rx_refill_timer.data = (unsigned long)netdev; | |
1334 | np->rx_refill_timer.function = rx_refill_timeout; | |
1335 | ||
e00f85be | 1336 | err = -ENOMEM; |
1337 | np->stats = alloc_percpu(struct netfront_stats); | |
1338 | if (np->stats == NULL) | |
1339 | goto exit; | |
1340 | ||
0d160211 JF |
1341 | /* Initialise tx_skbs as a free chain containing every entry. */ |
1342 | np->tx_skb_freelist = 0; | |
1343 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1ffb40b8 | 1344 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
0d160211 JF |
1345 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1346 | } | |
1347 | ||
1348 | /* Clear out rx_skbs */ | |
1349 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1350 | np->rx_skbs[i] = NULL; | |
1351 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1352 | } | |
1353 | ||
1354 | /* A grant for every tx ring slot */ | |
1355 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | |
1356 | &np->gref_tx_head) < 0) { | |
383eda32 | 1357 | pr_alert("can't alloc tx grant refs\n"); |
0d160211 | 1358 | err = -ENOMEM; |
e00f85be | 1359 | goto exit_free_stats; |
0d160211 JF |
1360 | } |
1361 | /* A grant for every rx ring slot */ | |
1362 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | |
1363 | &np->gref_rx_head) < 0) { | |
383eda32 | 1364 | pr_alert("can't alloc rx grant refs\n"); |
0d160211 JF |
1365 | err = -ENOMEM; |
1366 | goto exit_free_tx; | |
1367 | } | |
1368 | ||
0a0b9d2e SH |
1369 | netdev->netdev_ops = &xennet_netdev_ops; |
1370 | ||
bea3348e | 1371 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
fb507934 MM |
1372 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
1373 | NETIF_F_GSO_ROBUST; | |
1374 | netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO; | |
0d160211 | 1375 | |
fc3e5941 IC |
1376 | /* |
1377 | * Assume that all hw features are available for now. This set | |
1378 | * will be adjusted by the call to netdev_update_features() in | |
1379 | * xennet_connect() which is the earliest point where we can | |
1380 | * negotiate with the backend regarding supported features. | |
1381 | */ | |
1382 | netdev->features |= netdev->hw_features; | |
1383 | ||
0d160211 | 1384 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); |
0d160211 JF |
1385 | SET_NETDEV_DEV(netdev, &dev->dev); |
1386 | ||
9ecd1a75 WL |
1387 | netif_set_gso_max_size(netdev, XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER); |
1388 | ||
0d160211 JF |
1389 | np->netdev = netdev; |
1390 | ||
1391 | netif_carrier_off(netdev); | |
1392 | ||
1393 | return netdev; | |
1394 | ||
1395 | exit_free_tx: | |
1396 | gnttab_free_grant_references(np->gref_tx_head); | |
e00f85be | 1397 | exit_free_stats: |
1398 | free_percpu(np->stats); | |
0d160211 JF |
1399 | exit: |
1400 | free_netdev(netdev); | |
1401 | return ERR_PTR(err); | |
1402 | } | |
1403 | ||
1404 | /** | |
1405 | * Entry point to this code when a new device is created. Allocate the basic | |
1406 | * structures and the ring buffers for communication with the backend, and | |
1407 | * inform the backend of the appropriate details for those. | |
1408 | */ | |
8e0e46bb | 1409 | static int netfront_probe(struct xenbus_device *dev, |
1dd06ae8 | 1410 | const struct xenbus_device_id *id) |
0d160211 JF |
1411 | { |
1412 | int err; | |
1413 | struct net_device *netdev; | |
1414 | struct netfront_info *info; | |
1415 | ||
1416 | netdev = xennet_create_dev(dev); | |
1417 | if (IS_ERR(netdev)) { | |
1418 | err = PTR_ERR(netdev); | |
1419 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1420 | return err; | |
1421 | } | |
1422 | ||
1423 | info = netdev_priv(netdev); | |
1b713e00 | 1424 | dev_set_drvdata(&dev->dev, info); |
0d160211 JF |
1425 | |
1426 | err = register_netdev(info->netdev); | |
1427 | if (err) { | |
383eda32 | 1428 | pr_warn("%s: register_netdev err=%d\n", __func__, err); |
0d160211 JF |
1429 | goto fail; |
1430 | } | |
1431 | ||
1432 | err = xennet_sysfs_addif(info->netdev); | |
1433 | if (err) { | |
1434 | unregister_netdev(info->netdev); | |
383eda32 | 1435 | pr_warn("%s: add sysfs failed err=%d\n", __func__, err); |
0d160211 JF |
1436 | goto fail; |
1437 | } | |
1438 | ||
1439 | return 0; | |
1440 | ||
1441 | fail: | |
1442 | free_netdev(netdev); | |
1b713e00 | 1443 | dev_set_drvdata(&dev->dev, NULL); |
0d160211 JF |
1444 | return err; |
1445 | } | |
1446 | ||
1447 | static void xennet_end_access(int ref, void *page) | |
1448 | { | |
1449 | /* This frees the page as a side-effect */ | |
1450 | if (ref != GRANT_INVALID_REF) | |
1451 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1452 | } | |
1453 | ||
1454 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1455 | { | |
1456 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | |
1457 | spin_lock_bh(&info->rx_lock); | |
1458 | spin_lock_irq(&info->tx_lock); | |
1459 | netif_carrier_off(info->netdev); | |
1460 | spin_unlock_irq(&info->tx_lock); | |
1461 | spin_unlock_bh(&info->rx_lock); | |
1462 | ||
d634bf2c WL |
1463 | if (info->tx_irq && (info->tx_irq == info->rx_irq)) |
1464 | unbind_from_irqhandler(info->tx_irq, info); | |
1465 | if (info->tx_irq && (info->tx_irq != info->rx_irq)) { | |
1466 | unbind_from_irqhandler(info->tx_irq, info); | |
1467 | unbind_from_irqhandler(info->rx_irq, info); | |
1468 | } | |
1469 | info->tx_evtchn = info->rx_evtchn = 0; | |
1470 | info->tx_irq = info->rx_irq = 0; | |
0d160211 JF |
1471 | |
1472 | /* End access and free the pages */ | |
1473 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | |
1474 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | |
1475 | ||
1476 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1477 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1478 | info->tx.sring = NULL; | |
1479 | info->rx.sring = NULL; | |
1480 | } | |
1481 | ||
1482 | /** | |
1483 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1484 | * driver restart. We tear down our netif structure and recreate it, but | |
1485 | * leave the device-layer structures intact so that this is transparent to the | |
1486 | * rest of the kernel. | |
1487 | */ | |
1488 | static int netfront_resume(struct xenbus_device *dev) | |
1489 | { | |
1b713e00 | 1490 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1491 | |
1492 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1493 | ||
1494 | xennet_disconnect_backend(info); | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1499 | { | |
1500 | char *s, *e, *macstr; | |
1501 | int i; | |
1502 | ||
1503 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1504 | if (IS_ERR(macstr)) | |
1505 | return PTR_ERR(macstr); | |
1506 | ||
1507 | for (i = 0; i < ETH_ALEN; i++) { | |
1508 | mac[i] = simple_strtoul(s, &e, 16); | |
1509 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1510 | kfree(macstr); | |
1511 | return -ENOENT; | |
1512 | } | |
1513 | s = e+1; | |
1514 | } | |
1515 | ||
1516 | kfree(macstr); | |
1517 | return 0; | |
1518 | } | |
1519 | ||
d634bf2c WL |
1520 | static int setup_netfront_single(struct netfront_info *info) |
1521 | { | |
1522 | int err; | |
1523 | ||
1524 | err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn); | |
1525 | if (err < 0) | |
1526 | goto fail; | |
1527 | ||
1528 | err = bind_evtchn_to_irqhandler(info->tx_evtchn, | |
1529 | xennet_interrupt, | |
1530 | 0, info->netdev->name, info); | |
1531 | if (err < 0) | |
1532 | goto bind_fail; | |
1533 | info->rx_evtchn = info->tx_evtchn; | |
1534 | info->rx_irq = info->tx_irq = err; | |
1535 | ||
1536 | return 0; | |
1537 | ||
1538 | bind_fail: | |
1539 | xenbus_free_evtchn(info->xbdev, info->tx_evtchn); | |
1540 | info->tx_evtchn = 0; | |
1541 | fail: | |
1542 | return err; | |
1543 | } | |
1544 | ||
1545 | static int setup_netfront_split(struct netfront_info *info) | |
1546 | { | |
1547 | int err; | |
1548 | ||
1549 | err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn); | |
1550 | if (err < 0) | |
1551 | goto fail; | |
1552 | err = xenbus_alloc_evtchn(info->xbdev, &info->rx_evtchn); | |
1553 | if (err < 0) | |
1554 | goto alloc_rx_evtchn_fail; | |
1555 | ||
1556 | snprintf(info->tx_irq_name, sizeof(info->tx_irq_name), | |
1557 | "%s-tx", info->netdev->name); | |
1558 | err = bind_evtchn_to_irqhandler(info->tx_evtchn, | |
1559 | xennet_tx_interrupt, | |
1560 | 0, info->tx_irq_name, info); | |
1561 | if (err < 0) | |
1562 | goto bind_tx_fail; | |
1563 | info->tx_irq = err; | |
1564 | ||
1565 | snprintf(info->rx_irq_name, sizeof(info->rx_irq_name), | |
1566 | "%s-rx", info->netdev->name); | |
1567 | err = bind_evtchn_to_irqhandler(info->rx_evtchn, | |
1568 | xennet_rx_interrupt, | |
1569 | 0, info->rx_irq_name, info); | |
1570 | if (err < 0) | |
1571 | goto bind_rx_fail; | |
1572 | info->rx_irq = err; | |
1573 | ||
1574 | return 0; | |
1575 | ||
1576 | bind_rx_fail: | |
1577 | unbind_from_irqhandler(info->tx_irq, info); | |
1578 | info->tx_irq = 0; | |
1579 | bind_tx_fail: | |
1580 | xenbus_free_evtchn(info->xbdev, info->rx_evtchn); | |
1581 | info->rx_evtchn = 0; | |
1582 | alloc_rx_evtchn_fail: | |
1583 | xenbus_free_evtchn(info->xbdev, info->tx_evtchn); | |
1584 | info->tx_evtchn = 0; | |
1585 | fail: | |
1586 | return err; | |
1587 | } | |
1588 | ||
0d160211 JF |
1589 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) |
1590 | { | |
1591 | struct xen_netif_tx_sring *txs; | |
1592 | struct xen_netif_rx_sring *rxs; | |
1593 | int err; | |
1594 | struct net_device *netdev = info->netdev; | |
d634bf2c | 1595 | unsigned int feature_split_evtchn; |
0d160211 JF |
1596 | |
1597 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1598 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1599 | info->rx.sring = NULL; | |
1600 | info->tx.sring = NULL; | |
1601 | netdev->irq = 0; | |
1602 | ||
d634bf2c WL |
1603 | err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, |
1604 | "feature-split-event-channels", "%u", | |
1605 | &feature_split_evtchn); | |
1606 | if (err < 0) | |
1607 | feature_split_evtchn = 0; | |
1608 | ||
0d160211 JF |
1609 | err = xen_net_read_mac(dev, netdev->dev_addr); |
1610 | if (err) { | |
1611 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1612 | goto fail; | |
1613 | } | |
1614 | ||
a144ff09 | 1615 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1616 | if (!txs) { |
1617 | err = -ENOMEM; | |
1618 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1619 | goto fail; | |
1620 | } | |
1621 | SHARED_RING_INIT(txs); | |
1622 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | |
1623 | ||
1624 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | |
1ca2983a WL |
1625 | if (err < 0) |
1626 | goto grant_tx_ring_fail; | |
0d160211 JF |
1627 | |
1628 | info->tx_ring_ref = err; | |
a144ff09 | 1629 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1630 | if (!rxs) { |
1631 | err = -ENOMEM; | |
1632 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1ca2983a | 1633 | goto alloc_rx_ring_fail; |
0d160211 JF |
1634 | } |
1635 | SHARED_RING_INIT(rxs); | |
1636 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | |
1637 | ||
1638 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | |
1ca2983a WL |
1639 | if (err < 0) |
1640 | goto grant_rx_ring_fail; | |
0d160211 JF |
1641 | info->rx_ring_ref = err; |
1642 | ||
d634bf2c WL |
1643 | if (feature_split_evtchn) |
1644 | err = setup_netfront_split(info); | |
1645 | /* setup single event channel if | |
1646 | * a) feature-split-event-channels == 0 | |
1647 | * b) feature-split-event-channels == 1 but failed to setup | |
1648 | */ | |
1649 | if (!feature_split_evtchn || (feature_split_evtchn && err)) | |
1650 | err = setup_netfront_single(info); | |
1651 | ||
0d160211 | 1652 | if (err) |
1ca2983a | 1653 | goto alloc_evtchn_fail; |
0d160211 | 1654 | |
0d160211 JF |
1655 | return 0; |
1656 | ||
1ca2983a WL |
1657 | /* If we fail to setup netfront, it is safe to just revoke access to |
1658 | * granted pages because backend is not accessing it at this point. | |
1659 | */ | |
1ca2983a WL |
1660 | alloc_evtchn_fail: |
1661 | gnttab_end_foreign_access_ref(info->rx_ring_ref, 0); | |
1662 | grant_rx_ring_fail: | |
1663 | free_page((unsigned long)rxs); | |
1664 | alloc_rx_ring_fail: | |
1665 | gnttab_end_foreign_access_ref(info->tx_ring_ref, 0); | |
1666 | grant_tx_ring_fail: | |
1667 | free_page((unsigned long)txs); | |
1668 | fail: | |
0d160211 JF |
1669 | return err; |
1670 | } | |
1671 | ||
1672 | /* Common code used when first setting up, and when resuming. */ | |
f502bf2b | 1673 | static int talk_to_netback(struct xenbus_device *dev, |
0d160211 JF |
1674 | struct netfront_info *info) |
1675 | { | |
1676 | const char *message; | |
1677 | struct xenbus_transaction xbt; | |
1678 | int err; | |
1679 | ||
1680 | /* Create shared ring, alloc event channel. */ | |
1681 | err = setup_netfront(dev, info); | |
1682 | if (err) | |
1683 | goto out; | |
1684 | ||
1685 | again: | |
1686 | err = xenbus_transaction_start(&xbt); | |
1687 | if (err) { | |
1688 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1689 | goto destroy_ring; | |
1690 | } | |
1691 | ||
1692 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | |
1693 | info->tx_ring_ref); | |
1694 | if (err) { | |
1695 | message = "writing tx ring-ref"; | |
1696 | goto abort_transaction; | |
1697 | } | |
1698 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | |
1699 | info->rx_ring_ref); | |
1700 | if (err) { | |
1701 | message = "writing rx ring-ref"; | |
1702 | goto abort_transaction; | |
1703 | } | |
d634bf2c WL |
1704 | |
1705 | if (info->tx_evtchn == info->rx_evtchn) { | |
1706 | err = xenbus_printf(xbt, dev->nodename, | |
1707 | "event-channel", "%u", info->tx_evtchn); | |
1708 | if (err) { | |
1709 | message = "writing event-channel"; | |
1710 | goto abort_transaction; | |
1711 | } | |
1712 | } else { | |
1713 | err = xenbus_printf(xbt, dev->nodename, | |
1714 | "event-channel-tx", "%u", info->tx_evtchn); | |
1715 | if (err) { | |
1716 | message = "writing event-channel-tx"; | |
1717 | goto abort_transaction; | |
1718 | } | |
1719 | err = xenbus_printf(xbt, dev->nodename, | |
1720 | "event-channel-rx", "%u", info->rx_evtchn); | |
1721 | if (err) { | |
1722 | message = "writing event-channel-rx"; | |
1723 | goto abort_transaction; | |
1724 | } | |
0d160211 JF |
1725 | } |
1726 | ||
1727 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | |
1728 | 1); | |
1729 | if (err) { | |
1730 | message = "writing request-rx-copy"; | |
1731 | goto abort_transaction; | |
1732 | } | |
1733 | ||
1734 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1735 | if (err) { | |
1736 | message = "writing feature-rx-notify"; | |
1737 | goto abort_transaction; | |
1738 | } | |
1739 | ||
1740 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1741 | if (err) { | |
1742 | message = "writing feature-sg"; | |
1743 | goto abort_transaction; | |
1744 | } | |
1745 | ||
1746 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1747 | if (err) { | |
1748 | message = "writing feature-gso-tcpv4"; | |
1749 | goto abort_transaction; | |
1750 | } | |
1751 | ||
1752 | err = xenbus_transaction_end(xbt, 0); | |
1753 | if (err) { | |
1754 | if (err == -EAGAIN) | |
1755 | goto again; | |
1756 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1757 | goto destroy_ring; | |
1758 | } | |
1759 | ||
1760 | return 0; | |
1761 | ||
1762 | abort_transaction: | |
1763 | xenbus_transaction_end(xbt, 1); | |
1764 | xenbus_dev_fatal(dev, err, "%s", message); | |
1765 | destroy_ring: | |
1766 | xennet_disconnect_backend(info); | |
1767 | out: | |
1768 | return err; | |
1769 | } | |
1770 | ||
0d160211 JF |
1771 | static int xennet_connect(struct net_device *dev) |
1772 | { | |
1773 | struct netfront_info *np = netdev_priv(dev); | |
1774 | int i, requeue_idx, err; | |
1775 | struct sk_buff *skb; | |
1776 | grant_ref_t ref; | |
1777 | struct xen_netif_rx_request *req; | |
1778 | unsigned int feature_rx_copy; | |
1779 | ||
1780 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1781 | "feature-rx-copy", "%u", &feature_rx_copy); | |
1782 | if (err != 1) | |
1783 | feature_rx_copy = 0; | |
1784 | ||
1785 | if (!feature_rx_copy) { | |
1786 | dev_info(&dev->dev, | |
898eb71c | 1787 | "backend does not support copying receive path\n"); |
0d160211 JF |
1788 | return -ENODEV; |
1789 | } | |
1790 | ||
f502bf2b | 1791 | err = talk_to_netback(np->xbdev, np); |
0d160211 JF |
1792 | if (err) |
1793 | return err; | |
1794 | ||
1ba37c51 | 1795 | rtnl_lock(); |
fb507934 | 1796 | netdev_update_features(dev); |
1ba37c51 | 1797 | rtnl_unlock(); |
0d160211 JF |
1798 | |
1799 | spin_lock_bh(&np->rx_lock); | |
1800 | spin_lock_irq(&np->tx_lock); | |
1801 | ||
1802 | /* Step 1: Discard all pending TX packet fragments. */ | |
1803 | xennet_release_tx_bufs(np); | |
1804 | ||
1805 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | |
1806 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | |
01c68026 IC |
1807 | skb_frag_t *frag; |
1808 | const struct page *page; | |
0d160211 JF |
1809 | if (!np->rx_skbs[i]) |
1810 | continue; | |
1811 | ||
1812 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | |
1813 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | |
1814 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | |
1815 | ||
01c68026 IC |
1816 | frag = &skb_shinfo(skb)->frags[0]; |
1817 | page = skb_frag_page(frag); | |
0d160211 JF |
1818 | gnttab_grant_foreign_access_ref( |
1819 | ref, np->xbdev->otherend_id, | |
01c68026 | 1820 | pfn_to_mfn(page_to_pfn(page)), |
0d160211 JF |
1821 | 0); |
1822 | req->gref = ref; | |
1823 | req->id = requeue_idx; | |
1824 | ||
1825 | requeue_idx++; | |
1826 | } | |
1827 | ||
1828 | np->rx.req_prod_pvt = requeue_idx; | |
1829 | ||
1830 | /* | |
1831 | * Step 3: All public and private state should now be sane. Get | |
1832 | * ready to start sending and receiving packets and give the driver | |
1833 | * domain a kick because we've probably just requeued some | |
1834 | * packets. | |
1835 | */ | |
1836 | netif_carrier_on(np->netdev); | |
d634bf2c WL |
1837 | notify_remote_via_irq(np->tx_irq); |
1838 | if (np->tx_irq != np->rx_irq) | |
1839 | notify_remote_via_irq(np->rx_irq); | |
0d160211 JF |
1840 | xennet_tx_buf_gc(dev); |
1841 | xennet_alloc_rx_buffers(dev); | |
1842 | ||
1843 | spin_unlock_irq(&np->tx_lock); | |
1844 | spin_unlock_bh(&np->rx_lock); | |
1845 | ||
1846 | return 0; | |
1847 | } | |
1848 | ||
1849 | /** | |
1850 | * Callback received when the backend's state changes. | |
1851 | */ | |
f502bf2b | 1852 | static void netback_changed(struct xenbus_device *dev, |
0d160211 JF |
1853 | enum xenbus_state backend_state) |
1854 | { | |
1b713e00 | 1855 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1856 | struct net_device *netdev = np->netdev; |
1857 | ||
1858 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
1859 | ||
1860 | switch (backend_state) { | |
1861 | case XenbusStateInitialising: | |
1862 | case XenbusStateInitialised: | |
b78c9512 NI |
1863 | case XenbusStateReconfiguring: |
1864 | case XenbusStateReconfigured: | |
0d160211 JF |
1865 | case XenbusStateUnknown: |
1866 | case XenbusStateClosed: | |
1867 | break; | |
1868 | ||
1869 | case XenbusStateInitWait: | |
1870 | if (dev->state != XenbusStateInitialising) | |
1871 | break; | |
1872 | if (xennet_connect(netdev) != 0) | |
1873 | break; | |
1874 | xenbus_switch_state(dev, XenbusStateConnected); | |
08e34eb1 LE |
1875 | break; |
1876 | ||
1877 | case XenbusStateConnected: | |
ee89bab1 | 1878 | netdev_notify_peers(netdev); |
0d160211 JF |
1879 | break; |
1880 | ||
1881 | case XenbusStateClosing: | |
1882 | xenbus_frontend_closed(dev); | |
1883 | break; | |
1884 | } | |
1885 | } | |
1886 | ||
e0ce4af9 IC |
1887 | static const struct xennet_stat { |
1888 | char name[ETH_GSTRING_LEN]; | |
1889 | u16 offset; | |
1890 | } xennet_stats[] = { | |
1891 | { | |
1892 | "rx_gso_checksum_fixup", | |
1893 | offsetof(struct netfront_info, rx_gso_checksum_fixup) | |
1894 | }, | |
1895 | }; | |
1896 | ||
1897 | static int xennet_get_sset_count(struct net_device *dev, int string_set) | |
1898 | { | |
1899 | switch (string_set) { | |
1900 | case ETH_SS_STATS: | |
1901 | return ARRAY_SIZE(xennet_stats); | |
1902 | default: | |
1903 | return -EINVAL; | |
1904 | } | |
1905 | } | |
1906 | ||
1907 | static void xennet_get_ethtool_stats(struct net_device *dev, | |
1908 | struct ethtool_stats *stats, u64 * data) | |
1909 | { | |
1910 | void *np = netdev_priv(dev); | |
1911 | int i; | |
1912 | ||
1913 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
48f26d51 | 1914 | data[i] = *(unsigned long *)(np + xennet_stats[i].offset); |
e0ce4af9 IC |
1915 | } |
1916 | ||
1917 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
1918 | { | |
1919 | int i; | |
1920 | ||
1921 | switch (stringset) { | |
1922 | case ETH_SS_STATS: | |
1923 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
1924 | memcpy(data + i * ETH_GSTRING_LEN, | |
1925 | xennet_stats[i].name, ETH_GSTRING_LEN); | |
1926 | break; | |
1927 | } | |
1928 | } | |
1929 | ||
0fc0b732 | 1930 | static const struct ethtool_ops xennet_ethtool_ops = |
0d160211 | 1931 | { |
0d160211 | 1932 | .get_link = ethtool_op_get_link, |
e0ce4af9 IC |
1933 | |
1934 | .get_sset_count = xennet_get_sset_count, | |
1935 | .get_ethtool_stats = xennet_get_ethtool_stats, | |
1936 | .get_strings = xennet_get_strings, | |
0d160211 JF |
1937 | }; |
1938 | ||
1939 | #ifdef CONFIG_SYSFS | |
1940 | static ssize_t show_rxbuf_min(struct device *dev, | |
1941 | struct device_attribute *attr, char *buf) | |
1942 | { | |
1943 | struct net_device *netdev = to_net_dev(dev); | |
1944 | struct netfront_info *info = netdev_priv(netdev); | |
1945 | ||
1946 | return sprintf(buf, "%u\n", info->rx_min_target); | |
1947 | } | |
1948 | ||
1949 | static ssize_t store_rxbuf_min(struct device *dev, | |
1950 | struct device_attribute *attr, | |
1951 | const char *buf, size_t len) | |
1952 | { | |
1953 | struct net_device *netdev = to_net_dev(dev); | |
1954 | struct netfront_info *np = netdev_priv(netdev); | |
1955 | char *endp; | |
1956 | unsigned long target; | |
1957 | ||
1958 | if (!capable(CAP_NET_ADMIN)) | |
1959 | return -EPERM; | |
1960 | ||
1961 | target = simple_strtoul(buf, &endp, 0); | |
1962 | if (endp == buf) | |
1963 | return -EBADMSG; | |
1964 | ||
1965 | if (target < RX_MIN_TARGET) | |
1966 | target = RX_MIN_TARGET; | |
1967 | if (target > RX_MAX_TARGET) | |
1968 | target = RX_MAX_TARGET; | |
1969 | ||
1970 | spin_lock_bh(&np->rx_lock); | |
1971 | if (target > np->rx_max_target) | |
1972 | np->rx_max_target = target; | |
1973 | np->rx_min_target = target; | |
1974 | if (target > np->rx_target) | |
1975 | np->rx_target = target; | |
1976 | ||
1977 | xennet_alloc_rx_buffers(netdev); | |
1978 | ||
1979 | spin_unlock_bh(&np->rx_lock); | |
1980 | return len; | |
1981 | } | |
1982 | ||
1983 | static ssize_t show_rxbuf_max(struct device *dev, | |
1984 | struct device_attribute *attr, char *buf) | |
1985 | { | |
1986 | struct net_device *netdev = to_net_dev(dev); | |
1987 | struct netfront_info *info = netdev_priv(netdev); | |
1988 | ||
1989 | return sprintf(buf, "%u\n", info->rx_max_target); | |
1990 | } | |
1991 | ||
1992 | static ssize_t store_rxbuf_max(struct device *dev, | |
1993 | struct device_attribute *attr, | |
1994 | const char *buf, size_t len) | |
1995 | { | |
1996 | struct net_device *netdev = to_net_dev(dev); | |
1997 | struct netfront_info *np = netdev_priv(netdev); | |
1998 | char *endp; | |
1999 | unsigned long target; | |
2000 | ||
2001 | if (!capable(CAP_NET_ADMIN)) | |
2002 | return -EPERM; | |
2003 | ||
2004 | target = simple_strtoul(buf, &endp, 0); | |
2005 | if (endp == buf) | |
2006 | return -EBADMSG; | |
2007 | ||
2008 | if (target < RX_MIN_TARGET) | |
2009 | target = RX_MIN_TARGET; | |
2010 | if (target > RX_MAX_TARGET) | |
2011 | target = RX_MAX_TARGET; | |
2012 | ||
2013 | spin_lock_bh(&np->rx_lock); | |
2014 | if (target < np->rx_min_target) | |
2015 | np->rx_min_target = target; | |
2016 | np->rx_max_target = target; | |
2017 | if (target < np->rx_target) | |
2018 | np->rx_target = target; | |
2019 | ||
2020 | xennet_alloc_rx_buffers(netdev); | |
2021 | ||
2022 | spin_unlock_bh(&np->rx_lock); | |
2023 | return len; | |
2024 | } | |
2025 | ||
2026 | static ssize_t show_rxbuf_cur(struct device *dev, | |
2027 | struct device_attribute *attr, char *buf) | |
2028 | { | |
2029 | struct net_device *netdev = to_net_dev(dev); | |
2030 | struct netfront_info *info = netdev_priv(netdev); | |
2031 | ||
2032 | return sprintf(buf, "%u\n", info->rx_target); | |
2033 | } | |
2034 | ||
2035 | static struct device_attribute xennet_attrs[] = { | |
2036 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | |
2037 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | |
2038 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | |
2039 | }; | |
2040 | ||
2041 | static int xennet_sysfs_addif(struct net_device *netdev) | |
2042 | { | |
2043 | int i; | |
2044 | int err; | |
2045 | ||
2046 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | |
2047 | err = device_create_file(&netdev->dev, | |
2048 | &xennet_attrs[i]); | |
2049 | if (err) | |
2050 | goto fail; | |
2051 | } | |
2052 | return 0; | |
2053 | ||
2054 | fail: | |
2055 | while (--i >= 0) | |
2056 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
2057 | return err; | |
2058 | } | |
2059 | ||
2060 | static void xennet_sysfs_delif(struct net_device *netdev) | |
2061 | { | |
2062 | int i; | |
2063 | ||
2064 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | |
2065 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
2066 | } | |
2067 | ||
2068 | #endif /* CONFIG_SYSFS */ | |
2069 | ||
73db144b | 2070 | static const struct xenbus_device_id netfront_ids[] = { |
0d160211 JF |
2071 | { "vif" }, |
2072 | { "" } | |
2073 | }; | |
2074 | ||
2075 | ||
8e0e46bb | 2076 | static int xennet_remove(struct xenbus_device *dev) |
0d160211 | 2077 | { |
1b713e00 | 2078 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
2079 | |
2080 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
2081 | ||
0d160211 JF |
2082 | xennet_disconnect_backend(info); |
2083 | ||
0d160211 JF |
2084 | xennet_sysfs_delif(info->netdev); |
2085 | ||
6bc96d04 IC |
2086 | unregister_netdev(info->netdev); |
2087 | ||
2088 | del_timer_sync(&info->rx_refill_timer); | |
2089 | ||
e00f85be | 2090 | free_percpu(info->stats); |
2091 | ||
0d160211 JF |
2092 | free_netdev(info->netdev); |
2093 | ||
2094 | return 0; | |
2095 | } | |
2096 | ||
73db144b | 2097 | static DEFINE_XENBUS_DRIVER(netfront, , |
0d160211 | 2098 | .probe = netfront_probe, |
8e0e46bb | 2099 | .remove = xennet_remove, |
0d160211 | 2100 | .resume = netfront_resume, |
f502bf2b | 2101 | .otherend_changed = netback_changed, |
73db144b | 2102 | ); |
0d160211 JF |
2103 | |
2104 | static int __init netif_init(void) | |
2105 | { | |
6e833587 | 2106 | if (!xen_domain()) |
0d160211 JF |
2107 | return -ENODEV; |
2108 | ||
e95ae5a4 | 2109 | if (xen_hvm_domain() && !xen_platform_pci_unplug) |
b9136d20 IM |
2110 | return -ENODEV; |
2111 | ||
383eda32 | 2112 | pr_info("Initialising Xen virtual ethernet driver\n"); |
0d160211 | 2113 | |
ffb78a26 | 2114 | return xenbus_register_frontend(&netfront_driver); |
0d160211 JF |
2115 | } |
2116 | module_init(netif_init); | |
2117 | ||
2118 | ||
2119 | static void __exit netif_exit(void) | |
2120 | { | |
ffb78a26 | 2121 | xenbus_unregister_driver(&netfront_driver); |
0d160211 JF |
2122 | } |
2123 | module_exit(netif_exit); | |
2124 | ||
2125 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
2126 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 2127 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 2128 | MODULE_ALIAS("xennet"); |