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: | |
0d160211 JF |
280 | /* Could not allocate any skbuffs. Try again later. */ |
281 | mod_timer(&np->rx_refill_timer, | |
282 | jiffies + (HZ/10)); | |
fdcf7765 MJ |
283 | |
284 | /* Any skbuffs queued for refill? Force them out. */ | |
285 | if (i != 0) | |
286 | goto refill; | |
0d160211 JF |
287 | break; |
288 | } | |
289 | ||
093b9c71 | 290 | skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); |
0d160211 JF |
291 | __skb_queue_tail(&np->rx_batch, skb); |
292 | } | |
293 | ||
294 | /* Is the batch large enough to be worthwhile? */ | |
295 | if (i < (np->rx_target/2)) { | |
296 | if (req_prod > np->rx.sring->req_prod) | |
297 | goto push; | |
298 | return; | |
299 | } | |
300 | ||
301 | /* Adjust our fill target if we risked running out of buffers. */ | |
302 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && | |
303 | ((np->rx_target *= 2) > np->rx_max_target)) | |
304 | np->rx_target = np->rx_max_target; | |
305 | ||
306 | refill: | |
5dcddfae | 307 | for (i = 0; ; i++) { |
0d160211 JF |
308 | skb = __skb_dequeue(&np->rx_batch); |
309 | if (skb == NULL) | |
310 | break; | |
311 | ||
312 | skb->dev = dev; | |
313 | ||
314 | id = xennet_rxidx(req_prod + i); | |
315 | ||
316 | BUG_ON(np->rx_skbs[id]); | |
317 | np->rx_skbs[id] = skb; | |
318 | ||
319 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); | |
320 | BUG_ON((signed short)ref < 0); | |
321 | np->grant_rx_ref[id] = ref; | |
322 | ||
01c68026 IC |
323 | pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); |
324 | vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0])); | |
0d160211 JF |
325 | |
326 | req = RING_GET_REQUEST(&np->rx, req_prod + i); | |
327 | gnttab_grant_foreign_access_ref(ref, | |
328 | np->xbdev->otherend_id, | |
329 | pfn_to_mfn(pfn), | |
330 | 0); | |
331 | ||
332 | req->id = id; | |
333 | req->gref = ref; | |
334 | } | |
335 | ||
5dcddfae | 336 | wmb(); /* barrier so backend seens requests */ |
0d160211 JF |
337 | |
338 | /* Above is a suitable barrier to ensure backend will see requests. */ | |
339 | np->rx.req_prod_pvt = req_prod + i; | |
340 | push: | |
341 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); | |
342 | if (notify) | |
d634bf2c | 343 | notify_remote_via_irq(np->rx_irq); |
0d160211 JF |
344 | } |
345 | ||
346 | static int xennet_open(struct net_device *dev) | |
347 | { | |
348 | struct netfront_info *np = netdev_priv(dev); | |
349 | ||
bea3348e SH |
350 | napi_enable(&np->napi); |
351 | ||
0d160211 JF |
352 | spin_lock_bh(&np->rx_lock); |
353 | if (netif_carrier_ok(dev)) { | |
354 | xennet_alloc_rx_buffers(dev); | |
355 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; | |
356 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
288379f0 | 357 | napi_schedule(&np->napi); |
0d160211 JF |
358 | } |
359 | spin_unlock_bh(&np->rx_lock); | |
360 | ||
0b1ab1b8 | 361 | netif_start_queue(dev); |
0d160211 JF |
362 | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static void xennet_tx_buf_gc(struct net_device *dev) | |
367 | { | |
368 | RING_IDX cons, prod; | |
369 | unsigned short id; | |
370 | struct netfront_info *np = netdev_priv(dev); | |
371 | struct sk_buff *skb; | |
372 | ||
373 | BUG_ON(!netif_carrier_ok(dev)); | |
374 | ||
375 | do { | |
376 | prod = np->tx.sring->rsp_prod; | |
377 | rmb(); /* Ensure we see responses up to 'rp'. */ | |
378 | ||
379 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { | |
380 | struct xen_netif_tx_response *txrsp; | |
381 | ||
382 | txrsp = RING_GET_RESPONSE(&np->tx, cons); | |
f942dc25 | 383 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
0d160211 JF |
384 | continue; |
385 | ||
386 | id = txrsp->id; | |
387 | skb = np->tx_skbs[id].skb; | |
388 | if (unlikely(gnttab_query_foreign_access( | |
389 | np->grant_tx_ref[id]) != 0)) { | |
383eda32 JP |
390 | pr_alert("%s: warning -- grant still in use by backend domain\n", |
391 | __func__); | |
0d160211 JF |
392 | BUG(); |
393 | } | |
394 | gnttab_end_foreign_access_ref( | |
395 | np->grant_tx_ref[id], GNTMAP_readonly); | |
396 | gnttab_release_grant_reference( | |
397 | &np->gref_tx_head, np->grant_tx_ref[id]); | |
398 | np->grant_tx_ref[id] = GRANT_INVALID_REF; | |
399 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); | |
400 | dev_kfree_skb_irq(skb); | |
401 | } | |
402 | ||
403 | np->tx.rsp_cons = prod; | |
404 | ||
405 | /* | |
406 | * Set a new event, then check for race with update of tx_cons. | |
407 | * Note that it is essential to schedule a callback, no matter | |
408 | * how few buffers are pending. Even if there is space in the | |
409 | * transmit ring, higher layers may be blocked because too much | |
410 | * data is outstanding: in such cases notification from Xen is | |
411 | * likely to be the only kick that we'll get. | |
412 | */ | |
413 | np->tx.sring->rsp_event = | |
414 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; | |
415 | mb(); /* update shared area */ | |
416 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); | |
417 | ||
418 | xennet_maybe_wake_tx(dev); | |
419 | } | |
420 | ||
421 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, | |
422 | struct xen_netif_tx_request *tx) | |
423 | { | |
424 | struct netfront_info *np = netdev_priv(dev); | |
425 | char *data = skb->data; | |
426 | unsigned long mfn; | |
427 | RING_IDX prod = np->tx.req_prod_pvt; | |
428 | int frags = skb_shinfo(skb)->nr_frags; | |
429 | unsigned int offset = offset_in_page(data); | |
430 | unsigned int len = skb_headlen(skb); | |
431 | unsigned int id; | |
432 | grant_ref_t ref; | |
433 | int i; | |
434 | ||
435 | /* While the header overlaps a page boundary (including being | |
436 | larger than a page), split it it into page-sized chunks. */ | |
437 | while (len > PAGE_SIZE - offset) { | |
438 | tx->size = PAGE_SIZE - offset; | |
f942dc25 | 439 | tx->flags |= XEN_NETTXF_more_data; |
0d160211 JF |
440 | len -= tx->size; |
441 | data += tx->size; | |
442 | offset = 0; | |
443 | ||
444 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
445 | np->tx_skbs[id].skb = skb_get(skb); | |
446 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
447 | tx->id = id; | |
448 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
449 | BUG_ON((signed short)ref < 0); | |
450 | ||
451 | mfn = virt_to_mfn(data); | |
452 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
453 | mfn, GNTMAP_readonly); | |
454 | ||
455 | tx->gref = np->grant_tx_ref[id] = ref; | |
456 | tx->offset = offset; | |
457 | tx->size = len; | |
458 | tx->flags = 0; | |
459 | } | |
460 | ||
461 | /* Grant backend access to each skb fragment page. */ | |
462 | for (i = 0; i < frags; i++) { | |
463 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
f36c3747 | 464 | struct page *page = skb_frag_page(frag); |
0d160211 | 465 | |
f36c3747 IC |
466 | len = skb_frag_size(frag); |
467 | offset = frag->page_offset; | |
0d160211 | 468 | |
f36c3747 IC |
469 | /* Data must not cross a page boundary. */ |
470 | BUG_ON(len + offset > PAGE_SIZE<<compound_order(page)); | |
0d160211 | 471 | |
f36c3747 IC |
472 | /* Skip unused frames from start of page */ |
473 | page += offset >> PAGE_SHIFT; | |
474 | offset &= ~PAGE_MASK; | |
0d160211 | 475 | |
f36c3747 IC |
476 | while (len > 0) { |
477 | unsigned long bytes; | |
478 | ||
479 | BUG_ON(offset >= PAGE_SIZE); | |
480 | ||
481 | bytes = PAGE_SIZE - offset; | |
482 | if (bytes > len) | |
483 | bytes = len; | |
484 | ||
485 | tx->flags |= XEN_NETTXF_more_data; | |
486 | ||
487 | id = get_id_from_freelist(&np->tx_skb_freelist, | |
488 | np->tx_skbs); | |
489 | np->tx_skbs[id].skb = skb_get(skb); | |
490 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
491 | tx->id = id; | |
492 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
493 | BUG_ON((signed short)ref < 0); | |
494 | ||
495 | mfn = pfn_to_mfn(page_to_pfn(page)); | |
496 | gnttab_grant_foreign_access_ref(ref, | |
497 | np->xbdev->otherend_id, | |
498 | mfn, GNTMAP_readonly); | |
499 | ||
500 | tx->gref = np->grant_tx_ref[id] = ref; | |
501 | tx->offset = offset; | |
502 | tx->size = bytes; | |
503 | tx->flags = 0; | |
504 | ||
505 | offset += bytes; | |
506 | len -= bytes; | |
507 | ||
508 | /* Next frame */ | |
509 | if (offset == PAGE_SIZE && len) { | |
510 | BUG_ON(!PageCompound(page)); | |
511 | page++; | |
512 | offset = 0; | |
513 | } | |
514 | } | |
0d160211 JF |
515 | } |
516 | ||
517 | np->tx.req_prod_pvt = prod; | |
518 | } | |
519 | ||
f36c3747 IC |
520 | /* |
521 | * Count how many ring slots are required to send the frags of this | |
522 | * skb. Each frag might be a compound page. | |
523 | */ | |
524 | static int xennet_count_skb_frag_slots(struct sk_buff *skb) | |
525 | { | |
526 | int i, frags = skb_shinfo(skb)->nr_frags; | |
527 | int pages = 0; | |
528 | ||
529 | for (i = 0; i < frags; i++) { | |
530 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
531 | unsigned long size = skb_frag_size(frag); | |
532 | unsigned long offset = frag->page_offset; | |
533 | ||
534 | /* Skip unused frames from start of page */ | |
535 | offset &= ~PAGE_MASK; | |
536 | ||
537 | pages += PFN_UP(offset + size); | |
538 | } | |
539 | ||
540 | return pages; | |
541 | } | |
542 | ||
0d160211 JF |
543 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
544 | { | |
545 | unsigned short id; | |
546 | struct netfront_info *np = netdev_priv(dev); | |
e00f85be | 547 | struct netfront_stats *stats = this_cpu_ptr(np->stats); |
0d160211 | 548 | struct xen_netif_tx_request *tx; |
0d160211 JF |
549 | char *data = skb->data; |
550 | RING_IDX i; | |
551 | grant_ref_t ref; | |
552 | unsigned long mfn; | |
553 | int notify; | |
f36c3747 | 554 | int slots; |
0d160211 JF |
555 | unsigned int offset = offset_in_page(data); |
556 | unsigned int len = skb_headlen(skb); | |
cf66f9d4 | 557 | unsigned long flags; |
0d160211 | 558 | |
9ecd1a75 WL |
559 | /* If skb->len is too big for wire format, drop skb and alert |
560 | * user about misconfiguration. | |
561 | */ | |
562 | if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { | |
563 | net_alert_ratelimited( | |
564 | "xennet: skb->len = %u, too big for wire format\n", | |
565 | skb->len); | |
566 | goto drop; | |
567 | } | |
568 | ||
f36c3747 IC |
569 | slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) + |
570 | xennet_count_skb_frag_slots(skb); | |
571 | if (unlikely(slots > MAX_SKB_FRAGS + 1)) { | |
572 | net_alert_ratelimited( | |
573 | "xennet: skb rides the rocket: %d slots\n", slots); | |
0d160211 JF |
574 | goto drop; |
575 | } | |
576 | ||
cf66f9d4 | 577 | spin_lock_irqsave(&np->tx_lock, flags); |
0d160211 JF |
578 | |
579 | if (unlikely(!netif_carrier_ok(dev) || | |
f36c3747 | 580 | (slots > 1 && !xennet_can_sg(dev)) || |
fc741216 | 581 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
cf66f9d4 | 582 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 JF |
583 | goto drop; |
584 | } | |
585 | ||
586 | i = np->tx.req_prod_pvt; | |
587 | ||
588 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
589 | np->tx_skbs[id].skb = skb; | |
590 | ||
591 | tx = RING_GET_REQUEST(&np->tx, i); | |
592 | ||
593 | tx->id = id; | |
594 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
595 | BUG_ON((signed short)ref < 0); | |
596 | mfn = virt_to_mfn(data); | |
597 | gnttab_grant_foreign_access_ref( | |
598 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | |
599 | tx->gref = np->grant_tx_ref[id] = ref; | |
600 | tx->offset = offset; | |
601 | tx->size = len; | |
0d160211 JF |
602 | |
603 | tx->flags = 0; | |
604 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
605 | /* local packet? */ | |
f942dc25 | 606 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
0d160211 JF |
607 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
608 | /* remote but checksummed. */ | |
f942dc25 | 609 | tx->flags |= XEN_NETTXF_data_validated; |
0d160211 JF |
610 | |
611 | if (skb_shinfo(skb)->gso_size) { | |
612 | struct xen_netif_extra_info *gso; | |
613 | ||
614 | gso = (struct xen_netif_extra_info *) | |
615 | RING_GET_REQUEST(&np->tx, ++i); | |
616 | ||
e2d617c0 | 617 | tx->flags |= XEN_NETTXF_extra_info; |
0d160211 JF |
618 | |
619 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
620 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; | |
621 | gso->u.gso.pad = 0; | |
622 | gso->u.gso.features = 0; | |
623 | ||
624 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
625 | gso->flags = 0; | |
0d160211 JF |
626 | } |
627 | ||
628 | np->tx.req_prod_pvt = i + 1; | |
629 | ||
630 | xennet_make_frags(skb, dev, tx); | |
631 | tx->size = skb->len; | |
632 | ||
633 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | |
634 | if (notify) | |
d634bf2c | 635 | notify_remote_via_irq(np->tx_irq); |
0d160211 | 636 | |
e00f85be | 637 | u64_stats_update_begin(&stats->syncp); |
638 | stats->tx_bytes += skb->len; | |
639 | stats->tx_packets++; | |
640 | u64_stats_update_end(&stats->syncp); | |
10a273a6 JF |
641 | |
642 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
0d160211 JF |
643 | xennet_tx_buf_gc(dev); |
644 | ||
645 | if (!netfront_tx_slot_available(np)) | |
646 | netif_stop_queue(dev); | |
647 | ||
cf66f9d4 | 648 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 | 649 | |
6ed10654 | 650 | return NETDEV_TX_OK; |
0d160211 JF |
651 | |
652 | drop: | |
09f75cd7 | 653 | dev->stats.tx_dropped++; |
0d160211 | 654 | dev_kfree_skb(skb); |
6ed10654 | 655 | return NETDEV_TX_OK; |
0d160211 JF |
656 | } |
657 | ||
658 | static int xennet_close(struct net_device *dev) | |
659 | { | |
660 | struct netfront_info *np = netdev_priv(dev); | |
661 | netif_stop_queue(np->netdev); | |
bea3348e | 662 | napi_disable(&np->napi); |
0d160211 JF |
663 | return 0; |
664 | } | |
665 | ||
0d160211 JF |
666 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
667 | grant_ref_t ref) | |
668 | { | |
669 | int new = xennet_rxidx(np->rx.req_prod_pvt); | |
670 | ||
671 | BUG_ON(np->rx_skbs[new]); | |
672 | np->rx_skbs[new] = skb; | |
673 | np->grant_rx_ref[new] = ref; | |
674 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | |
675 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | |
676 | np->rx.req_prod_pvt++; | |
677 | } | |
678 | ||
679 | static int xennet_get_extras(struct netfront_info *np, | |
680 | struct xen_netif_extra_info *extras, | |
681 | RING_IDX rp) | |
682 | ||
683 | { | |
684 | struct xen_netif_extra_info *extra; | |
685 | struct device *dev = &np->netdev->dev; | |
686 | RING_IDX cons = np->rx.rsp_cons; | |
687 | int err = 0; | |
688 | ||
689 | do { | |
690 | struct sk_buff *skb; | |
691 | grant_ref_t ref; | |
692 | ||
693 | if (unlikely(cons + 1 == rp)) { | |
694 | if (net_ratelimit()) | |
695 | dev_warn(dev, "Missing extra info\n"); | |
696 | err = -EBADR; | |
697 | break; | |
698 | } | |
699 | ||
700 | extra = (struct xen_netif_extra_info *) | |
701 | RING_GET_RESPONSE(&np->rx, ++cons); | |
702 | ||
703 | if (unlikely(!extra->type || | |
704 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
705 | if (net_ratelimit()) | |
706 | dev_warn(dev, "Invalid extra type: %d\n", | |
707 | extra->type); | |
708 | err = -EINVAL; | |
709 | } else { | |
710 | memcpy(&extras[extra->type - 1], extra, | |
711 | sizeof(*extra)); | |
712 | } | |
713 | ||
714 | skb = xennet_get_rx_skb(np, cons); | |
715 | ref = xennet_get_rx_ref(np, cons); | |
716 | xennet_move_rx_slot(np, skb, ref); | |
717 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | |
718 | ||
719 | np->rx.rsp_cons = cons; | |
720 | return err; | |
721 | } | |
722 | ||
723 | static int xennet_get_responses(struct netfront_info *np, | |
724 | struct netfront_rx_info *rinfo, RING_IDX rp, | |
725 | struct sk_buff_head *list) | |
726 | { | |
727 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
728 | struct xen_netif_extra_info *extras = rinfo->extras; | |
729 | struct device *dev = &np->netdev->dev; | |
730 | RING_IDX cons = np->rx.rsp_cons; | |
731 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | |
732 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | |
733 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | |
7158ff6d | 734 | int slots = 1; |
0d160211 JF |
735 | int err = 0; |
736 | unsigned long ret; | |
737 | ||
f942dc25 | 738 | if (rx->flags & XEN_NETRXF_extra_info) { |
0d160211 JF |
739 | err = xennet_get_extras(np, extras, rp); |
740 | cons = np->rx.rsp_cons; | |
741 | } | |
742 | ||
743 | for (;;) { | |
744 | if (unlikely(rx->status < 0 || | |
745 | rx->offset + rx->status > PAGE_SIZE)) { | |
746 | if (net_ratelimit()) | |
747 | dev_warn(dev, "rx->offset: %x, size: %u\n", | |
748 | rx->offset, rx->status); | |
749 | xennet_move_rx_slot(np, skb, ref); | |
750 | err = -EINVAL; | |
751 | goto next; | |
752 | } | |
753 | ||
754 | /* | |
755 | * This definitely indicates a bug, either in this driver or in | |
756 | * the backend driver. In future this should flag the bad | |
697089dc | 757 | * situation to the system controller to reboot the backend. |
0d160211 JF |
758 | */ |
759 | if (ref == GRANT_INVALID_REF) { | |
760 | if (net_ratelimit()) | |
761 | dev_warn(dev, "Bad rx response id %d.\n", | |
762 | rx->id); | |
763 | err = -EINVAL; | |
764 | goto next; | |
765 | } | |
766 | ||
767 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
768 | BUG_ON(!ret); | |
769 | ||
770 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
771 | ||
772 | __skb_queue_tail(list, skb); | |
773 | ||
774 | next: | |
f942dc25 | 775 | if (!(rx->flags & XEN_NETRXF_more_data)) |
0d160211 JF |
776 | break; |
777 | ||
7158ff6d | 778 | if (cons + slots == rp) { |
0d160211 | 779 | if (net_ratelimit()) |
7158ff6d | 780 | dev_warn(dev, "Need more slots\n"); |
0d160211 JF |
781 | err = -ENOENT; |
782 | break; | |
783 | } | |
784 | ||
7158ff6d WL |
785 | rx = RING_GET_RESPONSE(&np->rx, cons + slots); |
786 | skb = xennet_get_rx_skb(np, cons + slots); | |
787 | ref = xennet_get_rx_ref(np, cons + slots); | |
788 | slots++; | |
0d160211 JF |
789 | } |
790 | ||
7158ff6d | 791 | if (unlikely(slots > max)) { |
0d160211 | 792 | if (net_ratelimit()) |
697089dc | 793 | dev_warn(dev, "Too many slots\n"); |
0d160211 JF |
794 | err = -E2BIG; |
795 | } | |
796 | ||
797 | if (unlikely(err)) | |
7158ff6d | 798 | np->rx.rsp_cons = cons + slots; |
0d160211 JF |
799 | |
800 | return err; | |
801 | } | |
802 | ||
803 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
804 | struct xen_netif_extra_info *gso) | |
805 | { | |
806 | if (!gso->u.gso.size) { | |
807 | if (net_ratelimit()) | |
383eda32 | 808 | pr_warn("GSO size must not be zero\n"); |
0d160211 JF |
809 | return -EINVAL; |
810 | } | |
811 | ||
812 | /* Currently only TCPv4 S.O. is supported. */ | |
813 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { | |
814 | if (net_ratelimit()) | |
383eda32 | 815 | pr_warn("Bad GSO type %d\n", gso->u.gso.type); |
0d160211 JF |
816 | return -EINVAL; |
817 | } | |
818 | ||
819 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
820 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
821 | ||
822 | /* Header must be checked, and gso_segs computed. */ | |
823 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
824 | skb_shinfo(skb)->gso_segs = 0; | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
829 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | |
830 | struct sk_buff *skb, | |
831 | struct sk_buff_head *list) | |
832 | { | |
833 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
0d160211 | 834 | RING_IDX cons = np->rx.rsp_cons; |
0d160211 JF |
835 | struct sk_buff *nskb; |
836 | ||
837 | while ((nskb = __skb_dequeue(list))) { | |
838 | struct xen_netif_rx_response *rx = | |
839 | RING_GET_RESPONSE(&np->rx, ++cons); | |
01c68026 | 840 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
0d160211 | 841 | |
093b9c71 JB |
842 | if (shinfo->nr_frags == MAX_SKB_FRAGS) { |
843 | unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; | |
0d160211 | 844 | |
093b9c71 JB |
845 | BUG_ON(pull_to <= skb_headlen(skb)); |
846 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
847 | } | |
848 | BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS); | |
849 | ||
850 | skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag), | |
851 | rx->offset, rx->status, PAGE_SIZE); | |
0d160211 JF |
852 | |
853 | skb_shinfo(nskb)->nr_frags = 0; | |
854 | kfree_skb(nskb); | |
0d160211 JF |
855 | } |
856 | ||
0d160211 JF |
857 | return cons; |
858 | } | |
859 | ||
e0ce4af9 | 860 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
0d160211 JF |
861 | { |
862 | struct iphdr *iph; | |
0d160211 | 863 | int err = -EPROTO; |
e0ce4af9 IC |
864 | int recalculate_partial_csum = 0; |
865 | ||
866 | /* | |
867 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
868 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
869 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
870 | * recalculate the partial checksum. | |
871 | */ | |
872 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
873 | struct netfront_info *np = netdev_priv(dev); | |
874 | np->rx_gso_checksum_fixup++; | |
875 | skb->ip_summed = CHECKSUM_PARTIAL; | |
876 | recalculate_partial_csum = 1; | |
877 | } | |
878 | ||
879 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
880 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
881 | return 0; | |
0d160211 JF |
882 | |
883 | if (skb->protocol != htons(ETH_P_IP)) | |
884 | goto out; | |
885 | ||
886 | iph = (void *)skb->data; | |
0d160211 | 887 | |
0d160211 JF |
888 | switch (iph->protocol) { |
889 | case IPPROTO_TCP: | |
8249152c LR |
890 | if (!skb_partial_csum_set(skb, 4 * iph->ihl, |
891 | offsetof(struct tcphdr, check))) | |
892 | goto out; | |
e0ce4af9 IC |
893 | |
894 | if (recalculate_partial_csum) { | |
8249152c | 895 | struct tcphdr *tcph = tcp_hdr(skb); |
e0ce4af9 IC |
896 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, |
897 | skb->len - iph->ihl*4, | |
898 | IPPROTO_TCP, 0); | |
899 | } | |
0d160211 JF |
900 | break; |
901 | case IPPROTO_UDP: | |
8249152c LR |
902 | if (!skb_partial_csum_set(skb, 4 * iph->ihl, |
903 | offsetof(struct udphdr, check))) | |
904 | goto out; | |
e0ce4af9 IC |
905 | |
906 | if (recalculate_partial_csum) { | |
8249152c | 907 | struct udphdr *udph = udp_hdr(skb); |
e0ce4af9 IC |
908 | udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, |
909 | skb->len - iph->ihl*4, | |
910 | IPPROTO_UDP, 0); | |
911 | } | |
0d160211 JF |
912 | break; |
913 | default: | |
914 | if (net_ratelimit()) | |
383eda32 JP |
915 | pr_err("Attempting to checksum a non-TCP/UDP packet, dropping a protocol %d packet\n", |
916 | iph->protocol); | |
0d160211 JF |
917 | goto out; |
918 | } | |
919 | ||
0d160211 JF |
920 | err = 0; |
921 | ||
922 | out: | |
923 | return err; | |
924 | } | |
925 | ||
926 | static int handle_incoming_queue(struct net_device *dev, | |
09f75cd7 | 927 | struct sk_buff_head *rxq) |
0d160211 | 928 | { |
e00f85be | 929 | struct netfront_info *np = netdev_priv(dev); |
930 | struct netfront_stats *stats = this_cpu_ptr(np->stats); | |
0d160211 JF |
931 | int packets_dropped = 0; |
932 | struct sk_buff *skb; | |
933 | ||
934 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
3683243b | 935 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
0d160211 | 936 | |
093b9c71 JB |
937 | if (pull_to > skb_headlen(skb)) |
938 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
0d160211 JF |
939 | |
940 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
941 | skb->protocol = eth_type_trans(skb, dev); | |
942 | ||
e0ce4af9 IC |
943 | if (checksum_setup(dev, skb)) { |
944 | kfree_skb(skb); | |
945 | packets_dropped++; | |
946 | dev->stats.rx_errors++; | |
947 | continue; | |
0d160211 JF |
948 | } |
949 | ||
e00f85be | 950 | u64_stats_update_begin(&stats->syncp); |
951 | stats->rx_packets++; | |
952 | stats->rx_bytes += skb->len; | |
953 | u64_stats_update_end(&stats->syncp); | |
0d160211 JF |
954 | |
955 | /* Pass it up. */ | |
99d3d587 | 956 | napi_gro_receive(&np->napi, skb); |
0d160211 JF |
957 | } |
958 | ||
959 | return packets_dropped; | |
960 | } | |
961 | ||
bea3348e | 962 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 963 | { |
bea3348e SH |
964 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
965 | struct net_device *dev = np->netdev; | |
0d160211 JF |
966 | struct sk_buff *skb; |
967 | struct netfront_rx_info rinfo; | |
968 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
969 | struct xen_netif_extra_info *extras = rinfo.extras; | |
970 | RING_IDX i, rp; | |
bea3348e | 971 | int work_done; |
0d160211 JF |
972 | struct sk_buff_head rxq; |
973 | struct sk_buff_head errq; | |
974 | struct sk_buff_head tmpq; | |
975 | unsigned long flags; | |
0d160211 JF |
976 | int err; |
977 | ||
978 | spin_lock(&np->rx_lock); | |
979 | ||
0d160211 JF |
980 | skb_queue_head_init(&rxq); |
981 | skb_queue_head_init(&errq); | |
982 | skb_queue_head_init(&tmpq); | |
983 | ||
0d160211 JF |
984 | rp = np->rx.sring->rsp_prod; |
985 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | |
986 | ||
987 | i = np->rx.rsp_cons; | |
988 | work_done = 0; | |
989 | while ((i != rp) && (work_done < budget)) { | |
990 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | |
991 | memset(extras, 0, sizeof(rinfo.extras)); | |
992 | ||
993 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | |
994 | ||
995 | if (unlikely(err)) { | |
996 | err: | |
997 | while ((skb = __skb_dequeue(&tmpq))) | |
998 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 999 | dev->stats.rx_errors++; |
0d160211 JF |
1000 | i = np->rx.rsp_cons; |
1001 | continue; | |
1002 | } | |
1003 | ||
1004 | skb = __skb_dequeue(&tmpq); | |
1005 | ||
1006 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
1007 | struct xen_netif_extra_info *gso; | |
1008 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
1009 | ||
1010 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
1011 | __skb_queue_head(&tmpq, skb); | |
1012 | np->rx.rsp_cons += skb_queue_len(&tmpq); | |
1013 | goto err; | |
1014 | } | |
1015 | } | |
1016 | ||
3683243b IC |
1017 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
1018 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) | |
1019 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; | |
0d160211 | 1020 | |
3683243b IC |
1021 | skb_shinfo(skb)->frags[0].page_offset = rx->offset; |
1022 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); | |
1023 | skb->data_len = rx->status; | |
093b9c71 | 1024 | skb->len += rx->status; |
0d160211 JF |
1025 | |
1026 | i = xennet_fill_frags(np, skb, &tmpq); | |
1027 | ||
f942dc25 | 1028 | if (rx->flags & XEN_NETRXF_csum_blank) |
0d160211 | 1029 | skb->ip_summed = CHECKSUM_PARTIAL; |
f942dc25 | 1030 | else if (rx->flags & XEN_NETRXF_data_validated) |
0d160211 JF |
1031 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1032 | ||
1033 | __skb_queue_tail(&rxq, skb); | |
1034 | ||
1035 | np->rx.rsp_cons = ++i; | |
1036 | work_done++; | |
1037 | } | |
1038 | ||
56cfe5d0 | 1039 | __skb_queue_purge(&errq); |
0d160211 JF |
1040 | |
1041 | work_done -= handle_incoming_queue(dev, &rxq); | |
1042 | ||
1043 | /* If we get a callback with very few responses, reduce fill target. */ | |
1044 | /* NB. Note exponential increase, linear decrease. */ | |
1045 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > | |
1046 | ((3*np->rx_target) / 4)) && | |
1047 | (--np->rx_target < np->rx_min_target)) | |
1048 | np->rx_target = np->rx_min_target; | |
1049 | ||
1050 | xennet_alloc_rx_buffers(dev); | |
1051 | ||
0d160211 | 1052 | if (work_done < budget) { |
bea3348e SH |
1053 | int more_to_do = 0; |
1054 | ||
99d3d587 WL |
1055 | napi_gro_flush(napi, false); |
1056 | ||
0d160211 JF |
1057 | local_irq_save(flags); |
1058 | ||
1059 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | |
1060 | if (!more_to_do) | |
288379f0 | 1061 | __napi_complete(napi); |
0d160211 JF |
1062 | |
1063 | local_irq_restore(flags); | |
1064 | } | |
1065 | ||
1066 | spin_unlock(&np->rx_lock); | |
1067 | ||
bea3348e | 1068 | return work_done; |
0d160211 JF |
1069 | } |
1070 | ||
1071 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
1072 | { | |
9ecd1a75 WL |
1073 | int max = xennet_can_sg(dev) ? |
1074 | XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER : ETH_DATA_LEN; | |
0d160211 JF |
1075 | |
1076 | if (mtu > max) | |
1077 | return -EINVAL; | |
1078 | dev->mtu = mtu; | |
1079 | return 0; | |
1080 | } | |
1081 | ||
e00f85be | 1082 | static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, |
1083 | struct rtnl_link_stats64 *tot) | |
1084 | { | |
1085 | struct netfront_info *np = netdev_priv(dev); | |
1086 | int cpu; | |
1087 | ||
1088 | for_each_possible_cpu(cpu) { | |
1089 | struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu); | |
1090 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; | |
1091 | unsigned int start; | |
1092 | ||
1093 | do { | |
1094 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
1095 | ||
1096 | rx_packets = stats->rx_packets; | |
1097 | tx_packets = stats->tx_packets; | |
1098 | rx_bytes = stats->rx_bytes; | |
1099 | tx_bytes = stats->tx_bytes; | |
1100 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); | |
1101 | ||
1102 | tot->rx_packets += rx_packets; | |
1103 | tot->tx_packets += tx_packets; | |
1104 | tot->rx_bytes += rx_bytes; | |
1105 | tot->tx_bytes += tx_bytes; | |
1106 | } | |
1107 | ||
1108 | tot->rx_errors = dev->stats.rx_errors; | |
1109 | tot->tx_dropped = dev->stats.tx_dropped; | |
1110 | ||
1111 | return tot; | |
1112 | } | |
1113 | ||
0d160211 JF |
1114 | static void xennet_release_tx_bufs(struct netfront_info *np) |
1115 | { | |
1116 | struct sk_buff *skb; | |
1117 | int i; | |
1118 | ||
1119 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1120 | /* Skip over entries which are actually freelist references */ | |
1ffb40b8 | 1121 | if (skb_entry_is_link(&np->tx_skbs[i])) |
0d160211 JF |
1122 | continue; |
1123 | ||
1124 | skb = np->tx_skbs[i].skb; | |
1125 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], | |
1126 | GNTMAP_readonly); | |
1127 | gnttab_release_grant_reference(&np->gref_tx_head, | |
1128 | np->grant_tx_ref[i]); | |
1129 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1130 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | |
1131 | dev_kfree_skb_irq(skb); | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | static void xennet_release_rx_bufs(struct netfront_info *np) | |
1136 | { | |
1137 | struct mmu_update *mmu = np->rx_mmu; | |
1138 | struct multicall_entry *mcl = np->rx_mcl; | |
1139 | struct sk_buff_head free_list; | |
1140 | struct sk_buff *skb; | |
1141 | unsigned long mfn; | |
1142 | int xfer = 0, noxfer = 0, unused = 0; | |
1143 | int id, ref; | |
1144 | ||
1145 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", | |
1146 | __func__); | |
1147 | return; | |
1148 | ||
1149 | skb_queue_head_init(&free_list); | |
1150 | ||
1151 | spin_lock_bh(&np->rx_lock); | |
1152 | ||
1153 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
1154 | ref = np->grant_rx_ref[id]; | |
1155 | if (ref == GRANT_INVALID_REF) { | |
1156 | unused++; | |
1157 | continue; | |
1158 | } | |
1159 | ||
1160 | skb = np->rx_skbs[id]; | |
1161 | mfn = gnttab_end_foreign_transfer_ref(ref); | |
1162 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
1163 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | |
1164 | ||
1165 | if (0 == mfn) { | |
1166 | skb_shinfo(skb)->nr_frags = 0; | |
1167 | dev_kfree_skb(skb); | |
1168 | noxfer++; | |
1169 | continue; | |
1170 | } | |
1171 | ||
1172 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1173 | /* Remap the page. */ | |
01c68026 IC |
1174 | const struct page *page = |
1175 | skb_frag_page(&skb_shinfo(skb)->frags[0]); | |
0d160211 JF |
1176 | unsigned long pfn = page_to_pfn(page); |
1177 | void *vaddr = page_address(page); | |
1178 | ||
1179 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, | |
1180 | mfn_pte(mfn, PAGE_KERNEL), | |
1181 | 0); | |
1182 | mcl++; | |
1183 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) | |
1184 | | MMU_MACHPHYS_UPDATE; | |
1185 | mmu->val = pfn; | |
1186 | mmu++; | |
1187 | ||
1188 | set_phys_to_machine(pfn, mfn); | |
1189 | } | |
1190 | __skb_queue_tail(&free_list, skb); | |
1191 | xfer++; | |
1192 | } | |
1193 | ||
1194 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", | |
1195 | __func__, xfer, noxfer, unused); | |
1196 | ||
1197 | if (xfer) { | |
1198 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1199 | /* Do all the remapping work and M2P updates. */ | |
1200 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, | |
79ea13ce | 1201 | NULL, DOMID_SELF); |
0d160211 JF |
1202 | mcl++; |
1203 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); | |
1204 | } | |
1205 | } | |
1206 | ||
56cfe5d0 | 1207 | __skb_queue_purge(&free_list); |
0d160211 JF |
1208 | |
1209 | spin_unlock_bh(&np->rx_lock); | |
1210 | } | |
1211 | ||
1212 | static void xennet_uninit(struct net_device *dev) | |
1213 | { | |
1214 | struct netfront_info *np = netdev_priv(dev); | |
1215 | xennet_release_tx_bufs(np); | |
1216 | xennet_release_rx_bufs(np); | |
1217 | gnttab_free_grant_references(np->gref_tx_head); | |
1218 | gnttab_free_grant_references(np->gref_rx_head); | |
1219 | } | |
1220 | ||
c8f44aff MM |
1221 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
1222 | netdev_features_t features) | |
8f7b01a1 ED |
1223 | { |
1224 | struct netfront_info *np = netdev_priv(dev); | |
1225 | int val; | |
1226 | ||
1227 | if (features & NETIF_F_SG) { | |
1228 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | |
1229 | "%d", &val) < 0) | |
1230 | val = 0; | |
1231 | ||
1232 | if (!val) | |
1233 | features &= ~NETIF_F_SG; | |
1234 | } | |
1235 | ||
1236 | if (features & NETIF_F_TSO) { | |
1237 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1238 | "feature-gso-tcpv4", "%d", &val) < 0) | |
1239 | val = 0; | |
1240 | ||
1241 | if (!val) | |
1242 | features &= ~NETIF_F_TSO; | |
1243 | } | |
1244 | ||
1245 | return features; | |
1246 | } | |
1247 | ||
c8f44aff MM |
1248 | static int xennet_set_features(struct net_device *dev, |
1249 | netdev_features_t features) | |
8f7b01a1 ED |
1250 | { |
1251 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { | |
1252 | netdev_info(dev, "Reducing MTU because no SG offload"); | |
1253 | dev->mtu = ETH_DATA_LEN; | |
1254 | } | |
1255 | ||
1256 | return 0; | |
1257 | } | |
1258 | ||
d634bf2c | 1259 | static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) |
cf66f9d4 | 1260 | { |
d634bf2c WL |
1261 | struct netfront_info *np = dev_id; |
1262 | struct net_device *dev = np->netdev; | |
cf66f9d4 KRW |
1263 | unsigned long flags; |
1264 | ||
1265 | spin_lock_irqsave(&np->tx_lock, flags); | |
d634bf2c WL |
1266 | xennet_tx_buf_gc(dev); |
1267 | spin_unlock_irqrestore(&np->tx_lock, flags); | |
cf66f9d4 | 1268 | |
d634bf2c WL |
1269 | return IRQ_HANDLED; |
1270 | } | |
1271 | ||
1272 | static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) | |
1273 | { | |
1274 | struct netfront_info *np = dev_id; | |
1275 | struct net_device *dev = np->netdev; | |
1276 | ||
1277 | if (likely(netif_carrier_ok(dev) && | |
1278 | RING_HAS_UNCONSUMED_RESPONSES(&np->rx))) | |
cf66f9d4 | 1279 | napi_schedule(&np->napi); |
cf66f9d4 | 1280 | |
d634bf2c WL |
1281 | return IRQ_HANDLED; |
1282 | } | |
cf66f9d4 | 1283 | |
d634bf2c WL |
1284 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
1285 | { | |
1286 | xennet_tx_interrupt(irq, dev_id); | |
1287 | xennet_rx_interrupt(irq, dev_id); | |
cf66f9d4 KRW |
1288 | return IRQ_HANDLED; |
1289 | } | |
1290 | ||
1291 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1292 | static void xennet_poll_controller(struct net_device *dev) | |
1293 | { | |
1294 | xennet_interrupt(0, dev); | |
1295 | } | |
1296 | #endif | |
1297 | ||
0a0b9d2e SH |
1298 | static const struct net_device_ops xennet_netdev_ops = { |
1299 | .ndo_open = xennet_open, | |
1300 | .ndo_uninit = xennet_uninit, | |
1301 | .ndo_stop = xennet_close, | |
1302 | .ndo_start_xmit = xennet_start_xmit, | |
1303 | .ndo_change_mtu = xennet_change_mtu, | |
e00f85be | 1304 | .ndo_get_stats64 = xennet_get_stats64, |
0a0b9d2e SH |
1305 | .ndo_set_mac_address = eth_mac_addr, |
1306 | .ndo_validate_addr = eth_validate_addr, | |
fb507934 MM |
1307 | .ndo_fix_features = xennet_fix_features, |
1308 | .ndo_set_features = xennet_set_features, | |
cf66f9d4 KRW |
1309 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1310 | .ndo_poll_controller = xennet_poll_controller, | |
1311 | #endif | |
0a0b9d2e SH |
1312 | }; |
1313 | ||
8e0e46bb | 1314 | static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
0d160211 JF |
1315 | { |
1316 | int i, err; | |
1317 | struct net_device *netdev; | |
1318 | struct netfront_info *np; | |
1319 | ||
1320 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | |
41de8d4c | 1321 | if (!netdev) |
0d160211 | 1322 | return ERR_PTR(-ENOMEM); |
0d160211 JF |
1323 | |
1324 | np = netdev_priv(netdev); | |
1325 | np->xbdev = dev; | |
1326 | ||
1327 | spin_lock_init(&np->tx_lock); | |
1328 | spin_lock_init(&np->rx_lock); | |
1329 | ||
1330 | skb_queue_head_init(&np->rx_batch); | |
1331 | np->rx_target = RX_DFL_MIN_TARGET; | |
1332 | np->rx_min_target = RX_DFL_MIN_TARGET; | |
1333 | np->rx_max_target = RX_MAX_TARGET; | |
1334 | ||
1335 | init_timer(&np->rx_refill_timer); | |
1336 | np->rx_refill_timer.data = (unsigned long)netdev; | |
1337 | np->rx_refill_timer.function = rx_refill_timeout; | |
1338 | ||
e00f85be | 1339 | err = -ENOMEM; |
1340 | np->stats = alloc_percpu(struct netfront_stats); | |
1341 | if (np->stats == NULL) | |
1342 | goto exit; | |
1343 | ||
827da44c JS |
1344 | for_each_possible_cpu(i) { |
1345 | struct netfront_stats *xen_nf_stats; | |
1346 | xen_nf_stats = per_cpu_ptr(np->stats, i); | |
1347 | u64_stats_init(&xen_nf_stats->syncp); | |
1348 | } | |
1349 | ||
0d160211 JF |
1350 | /* Initialise tx_skbs as a free chain containing every entry. */ |
1351 | np->tx_skb_freelist = 0; | |
1352 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1ffb40b8 | 1353 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
0d160211 JF |
1354 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1355 | } | |
1356 | ||
1357 | /* Clear out rx_skbs */ | |
1358 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1359 | np->rx_skbs[i] = NULL; | |
1360 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1361 | } | |
1362 | ||
1363 | /* A grant for every tx ring slot */ | |
1364 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | |
1365 | &np->gref_tx_head) < 0) { | |
383eda32 | 1366 | pr_alert("can't alloc tx grant refs\n"); |
0d160211 | 1367 | err = -ENOMEM; |
e00f85be | 1368 | goto exit_free_stats; |
0d160211 JF |
1369 | } |
1370 | /* A grant for every rx ring slot */ | |
1371 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | |
1372 | &np->gref_rx_head) < 0) { | |
383eda32 | 1373 | pr_alert("can't alloc rx grant refs\n"); |
0d160211 JF |
1374 | err = -ENOMEM; |
1375 | goto exit_free_tx; | |
1376 | } | |
1377 | ||
0a0b9d2e SH |
1378 | netdev->netdev_ops = &xennet_netdev_ops; |
1379 | ||
bea3348e | 1380 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
fb507934 MM |
1381 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
1382 | NETIF_F_GSO_ROBUST; | |
1383 | netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO; | |
0d160211 | 1384 | |
fc3e5941 IC |
1385 | /* |
1386 | * Assume that all hw features are available for now. This set | |
1387 | * will be adjusted by the call to netdev_update_features() in | |
1388 | * xennet_connect() which is the earliest point where we can | |
1389 | * negotiate with the backend regarding supported features. | |
1390 | */ | |
1391 | netdev->features |= netdev->hw_features; | |
1392 | ||
0d160211 | 1393 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); |
0d160211 JF |
1394 | SET_NETDEV_DEV(netdev, &dev->dev); |
1395 | ||
9ecd1a75 WL |
1396 | netif_set_gso_max_size(netdev, XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER); |
1397 | ||
0d160211 JF |
1398 | np->netdev = netdev; |
1399 | ||
1400 | netif_carrier_off(netdev); | |
1401 | ||
1402 | return netdev; | |
1403 | ||
1404 | exit_free_tx: | |
1405 | gnttab_free_grant_references(np->gref_tx_head); | |
e00f85be | 1406 | exit_free_stats: |
1407 | free_percpu(np->stats); | |
0d160211 JF |
1408 | exit: |
1409 | free_netdev(netdev); | |
1410 | return ERR_PTR(err); | |
1411 | } | |
1412 | ||
1413 | /** | |
1414 | * Entry point to this code when a new device is created. Allocate the basic | |
1415 | * structures and the ring buffers for communication with the backend, and | |
1416 | * inform the backend of the appropriate details for those. | |
1417 | */ | |
8e0e46bb | 1418 | static int netfront_probe(struct xenbus_device *dev, |
1dd06ae8 | 1419 | const struct xenbus_device_id *id) |
0d160211 JF |
1420 | { |
1421 | int err; | |
1422 | struct net_device *netdev; | |
1423 | struct netfront_info *info; | |
1424 | ||
1425 | netdev = xennet_create_dev(dev); | |
1426 | if (IS_ERR(netdev)) { | |
1427 | err = PTR_ERR(netdev); | |
1428 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1429 | return err; | |
1430 | } | |
1431 | ||
1432 | info = netdev_priv(netdev); | |
1b713e00 | 1433 | dev_set_drvdata(&dev->dev, info); |
0d160211 JF |
1434 | |
1435 | err = register_netdev(info->netdev); | |
1436 | if (err) { | |
383eda32 | 1437 | pr_warn("%s: register_netdev err=%d\n", __func__, err); |
0d160211 JF |
1438 | goto fail; |
1439 | } | |
1440 | ||
1441 | err = xennet_sysfs_addif(info->netdev); | |
1442 | if (err) { | |
1443 | unregister_netdev(info->netdev); | |
383eda32 | 1444 | pr_warn("%s: add sysfs failed err=%d\n", __func__, err); |
0d160211 JF |
1445 | goto fail; |
1446 | } | |
1447 | ||
1448 | return 0; | |
1449 | ||
1450 | fail: | |
1451 | free_netdev(netdev); | |
1b713e00 | 1452 | dev_set_drvdata(&dev->dev, NULL); |
0d160211 JF |
1453 | return err; |
1454 | } | |
1455 | ||
1456 | static void xennet_end_access(int ref, void *page) | |
1457 | { | |
1458 | /* This frees the page as a side-effect */ | |
1459 | if (ref != GRANT_INVALID_REF) | |
1460 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1461 | } | |
1462 | ||
1463 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1464 | { | |
1465 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | |
1466 | spin_lock_bh(&info->rx_lock); | |
1467 | spin_lock_irq(&info->tx_lock); | |
1468 | netif_carrier_off(info->netdev); | |
1469 | spin_unlock_irq(&info->tx_lock); | |
1470 | spin_unlock_bh(&info->rx_lock); | |
1471 | ||
d634bf2c WL |
1472 | if (info->tx_irq && (info->tx_irq == info->rx_irq)) |
1473 | unbind_from_irqhandler(info->tx_irq, info); | |
1474 | if (info->tx_irq && (info->tx_irq != info->rx_irq)) { | |
1475 | unbind_from_irqhandler(info->tx_irq, info); | |
1476 | unbind_from_irqhandler(info->rx_irq, info); | |
1477 | } | |
1478 | info->tx_evtchn = info->rx_evtchn = 0; | |
1479 | info->tx_irq = info->rx_irq = 0; | |
0d160211 JF |
1480 | |
1481 | /* End access and free the pages */ | |
1482 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | |
1483 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | |
1484 | ||
1485 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1486 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1487 | info->tx.sring = NULL; | |
1488 | info->rx.sring = NULL; | |
1489 | } | |
1490 | ||
1491 | /** | |
1492 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1493 | * driver restart. We tear down our netif structure and recreate it, but | |
1494 | * leave the device-layer structures intact so that this is transparent to the | |
1495 | * rest of the kernel. | |
1496 | */ | |
1497 | static int netfront_resume(struct xenbus_device *dev) | |
1498 | { | |
1b713e00 | 1499 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1500 | |
1501 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1502 | ||
1503 | xennet_disconnect_backend(info); | |
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1508 | { | |
1509 | char *s, *e, *macstr; | |
1510 | int i; | |
1511 | ||
1512 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1513 | if (IS_ERR(macstr)) | |
1514 | return PTR_ERR(macstr); | |
1515 | ||
1516 | for (i = 0; i < ETH_ALEN; i++) { | |
1517 | mac[i] = simple_strtoul(s, &e, 16); | |
1518 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1519 | kfree(macstr); | |
1520 | return -ENOENT; | |
1521 | } | |
1522 | s = e+1; | |
1523 | } | |
1524 | ||
1525 | kfree(macstr); | |
1526 | return 0; | |
1527 | } | |
1528 | ||
d634bf2c WL |
1529 | static int setup_netfront_single(struct netfront_info *info) |
1530 | { | |
1531 | int err; | |
1532 | ||
1533 | err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn); | |
1534 | if (err < 0) | |
1535 | goto fail; | |
1536 | ||
1537 | err = bind_evtchn_to_irqhandler(info->tx_evtchn, | |
1538 | xennet_interrupt, | |
1539 | 0, info->netdev->name, info); | |
1540 | if (err < 0) | |
1541 | goto bind_fail; | |
1542 | info->rx_evtchn = info->tx_evtchn; | |
1543 | info->rx_irq = info->tx_irq = err; | |
1544 | ||
1545 | return 0; | |
1546 | ||
1547 | bind_fail: | |
1548 | xenbus_free_evtchn(info->xbdev, info->tx_evtchn); | |
1549 | info->tx_evtchn = 0; | |
1550 | fail: | |
1551 | return err; | |
1552 | } | |
1553 | ||
1554 | static int setup_netfront_split(struct netfront_info *info) | |
1555 | { | |
1556 | int err; | |
1557 | ||
1558 | err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn); | |
1559 | if (err < 0) | |
1560 | goto fail; | |
1561 | err = xenbus_alloc_evtchn(info->xbdev, &info->rx_evtchn); | |
1562 | if (err < 0) | |
1563 | goto alloc_rx_evtchn_fail; | |
1564 | ||
1565 | snprintf(info->tx_irq_name, sizeof(info->tx_irq_name), | |
1566 | "%s-tx", info->netdev->name); | |
1567 | err = bind_evtchn_to_irqhandler(info->tx_evtchn, | |
1568 | xennet_tx_interrupt, | |
1569 | 0, info->tx_irq_name, info); | |
1570 | if (err < 0) | |
1571 | goto bind_tx_fail; | |
1572 | info->tx_irq = err; | |
1573 | ||
1574 | snprintf(info->rx_irq_name, sizeof(info->rx_irq_name), | |
1575 | "%s-rx", info->netdev->name); | |
1576 | err = bind_evtchn_to_irqhandler(info->rx_evtchn, | |
1577 | xennet_rx_interrupt, | |
1578 | 0, info->rx_irq_name, info); | |
1579 | if (err < 0) | |
1580 | goto bind_rx_fail; | |
1581 | info->rx_irq = err; | |
1582 | ||
1583 | return 0; | |
1584 | ||
1585 | bind_rx_fail: | |
1586 | unbind_from_irqhandler(info->tx_irq, info); | |
1587 | info->tx_irq = 0; | |
1588 | bind_tx_fail: | |
1589 | xenbus_free_evtchn(info->xbdev, info->rx_evtchn); | |
1590 | info->rx_evtchn = 0; | |
1591 | alloc_rx_evtchn_fail: | |
1592 | xenbus_free_evtchn(info->xbdev, info->tx_evtchn); | |
1593 | info->tx_evtchn = 0; | |
1594 | fail: | |
1595 | return err; | |
1596 | } | |
1597 | ||
0d160211 JF |
1598 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) |
1599 | { | |
1600 | struct xen_netif_tx_sring *txs; | |
1601 | struct xen_netif_rx_sring *rxs; | |
1602 | int err; | |
1603 | struct net_device *netdev = info->netdev; | |
d634bf2c | 1604 | unsigned int feature_split_evtchn; |
0d160211 JF |
1605 | |
1606 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1607 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1608 | info->rx.sring = NULL; | |
1609 | info->tx.sring = NULL; | |
1610 | netdev->irq = 0; | |
1611 | ||
d634bf2c WL |
1612 | err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, |
1613 | "feature-split-event-channels", "%u", | |
1614 | &feature_split_evtchn); | |
1615 | if (err < 0) | |
1616 | feature_split_evtchn = 0; | |
1617 | ||
0d160211 JF |
1618 | err = xen_net_read_mac(dev, netdev->dev_addr); |
1619 | if (err) { | |
1620 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1621 | goto fail; | |
1622 | } | |
1623 | ||
a144ff09 | 1624 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1625 | if (!txs) { |
1626 | err = -ENOMEM; | |
1627 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1628 | goto fail; | |
1629 | } | |
1630 | SHARED_RING_INIT(txs); | |
1631 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | |
1632 | ||
1633 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | |
1ca2983a WL |
1634 | if (err < 0) |
1635 | goto grant_tx_ring_fail; | |
0d160211 JF |
1636 | |
1637 | info->tx_ring_ref = err; | |
a144ff09 | 1638 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1639 | if (!rxs) { |
1640 | err = -ENOMEM; | |
1641 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1ca2983a | 1642 | goto alloc_rx_ring_fail; |
0d160211 JF |
1643 | } |
1644 | SHARED_RING_INIT(rxs); | |
1645 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | |
1646 | ||
1647 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | |
1ca2983a WL |
1648 | if (err < 0) |
1649 | goto grant_rx_ring_fail; | |
0d160211 JF |
1650 | info->rx_ring_ref = err; |
1651 | ||
d634bf2c WL |
1652 | if (feature_split_evtchn) |
1653 | err = setup_netfront_split(info); | |
1654 | /* setup single event channel if | |
1655 | * a) feature-split-event-channels == 0 | |
1656 | * b) feature-split-event-channels == 1 but failed to setup | |
1657 | */ | |
1658 | if (!feature_split_evtchn || (feature_split_evtchn && err)) | |
1659 | err = setup_netfront_single(info); | |
1660 | ||
0d160211 | 1661 | if (err) |
1ca2983a | 1662 | goto alloc_evtchn_fail; |
0d160211 | 1663 | |
0d160211 JF |
1664 | return 0; |
1665 | ||
1ca2983a WL |
1666 | /* If we fail to setup netfront, it is safe to just revoke access to |
1667 | * granted pages because backend is not accessing it at this point. | |
1668 | */ | |
1ca2983a WL |
1669 | alloc_evtchn_fail: |
1670 | gnttab_end_foreign_access_ref(info->rx_ring_ref, 0); | |
1671 | grant_rx_ring_fail: | |
1672 | free_page((unsigned long)rxs); | |
1673 | alloc_rx_ring_fail: | |
1674 | gnttab_end_foreign_access_ref(info->tx_ring_ref, 0); | |
1675 | grant_tx_ring_fail: | |
1676 | free_page((unsigned long)txs); | |
1677 | fail: | |
0d160211 JF |
1678 | return err; |
1679 | } | |
1680 | ||
1681 | /* Common code used when first setting up, and when resuming. */ | |
f502bf2b | 1682 | static int talk_to_netback(struct xenbus_device *dev, |
0d160211 JF |
1683 | struct netfront_info *info) |
1684 | { | |
1685 | const char *message; | |
1686 | struct xenbus_transaction xbt; | |
1687 | int err; | |
1688 | ||
1689 | /* Create shared ring, alloc event channel. */ | |
1690 | err = setup_netfront(dev, info); | |
1691 | if (err) | |
1692 | goto out; | |
1693 | ||
1694 | again: | |
1695 | err = xenbus_transaction_start(&xbt); | |
1696 | if (err) { | |
1697 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1698 | goto destroy_ring; | |
1699 | } | |
1700 | ||
1701 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | |
1702 | info->tx_ring_ref); | |
1703 | if (err) { | |
1704 | message = "writing tx ring-ref"; | |
1705 | goto abort_transaction; | |
1706 | } | |
1707 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | |
1708 | info->rx_ring_ref); | |
1709 | if (err) { | |
1710 | message = "writing rx ring-ref"; | |
1711 | goto abort_transaction; | |
1712 | } | |
d634bf2c WL |
1713 | |
1714 | if (info->tx_evtchn == info->rx_evtchn) { | |
1715 | err = xenbus_printf(xbt, dev->nodename, | |
1716 | "event-channel", "%u", info->tx_evtchn); | |
1717 | if (err) { | |
1718 | message = "writing event-channel"; | |
1719 | goto abort_transaction; | |
1720 | } | |
1721 | } else { | |
1722 | err = xenbus_printf(xbt, dev->nodename, | |
1723 | "event-channel-tx", "%u", info->tx_evtchn); | |
1724 | if (err) { | |
1725 | message = "writing event-channel-tx"; | |
1726 | goto abort_transaction; | |
1727 | } | |
1728 | err = xenbus_printf(xbt, dev->nodename, | |
1729 | "event-channel-rx", "%u", info->rx_evtchn); | |
1730 | if (err) { | |
1731 | message = "writing event-channel-rx"; | |
1732 | goto abort_transaction; | |
1733 | } | |
0d160211 JF |
1734 | } |
1735 | ||
1736 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | |
1737 | 1); | |
1738 | if (err) { | |
1739 | message = "writing request-rx-copy"; | |
1740 | goto abort_transaction; | |
1741 | } | |
1742 | ||
1743 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1744 | if (err) { | |
1745 | message = "writing feature-rx-notify"; | |
1746 | goto abort_transaction; | |
1747 | } | |
1748 | ||
1749 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1750 | if (err) { | |
1751 | message = "writing feature-sg"; | |
1752 | goto abort_transaction; | |
1753 | } | |
1754 | ||
1755 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1756 | if (err) { | |
1757 | message = "writing feature-gso-tcpv4"; | |
1758 | goto abort_transaction; | |
1759 | } | |
1760 | ||
1761 | err = xenbus_transaction_end(xbt, 0); | |
1762 | if (err) { | |
1763 | if (err == -EAGAIN) | |
1764 | goto again; | |
1765 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1766 | goto destroy_ring; | |
1767 | } | |
1768 | ||
1769 | return 0; | |
1770 | ||
1771 | abort_transaction: | |
1772 | xenbus_transaction_end(xbt, 1); | |
1773 | xenbus_dev_fatal(dev, err, "%s", message); | |
1774 | destroy_ring: | |
1775 | xennet_disconnect_backend(info); | |
1776 | out: | |
1777 | return err; | |
1778 | } | |
1779 | ||
0d160211 JF |
1780 | static int xennet_connect(struct net_device *dev) |
1781 | { | |
1782 | struct netfront_info *np = netdev_priv(dev); | |
1783 | int i, requeue_idx, err; | |
1784 | struct sk_buff *skb; | |
1785 | grant_ref_t ref; | |
1786 | struct xen_netif_rx_request *req; | |
1787 | unsigned int feature_rx_copy; | |
1788 | ||
1789 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1790 | "feature-rx-copy", "%u", &feature_rx_copy); | |
1791 | if (err != 1) | |
1792 | feature_rx_copy = 0; | |
1793 | ||
1794 | if (!feature_rx_copy) { | |
1795 | dev_info(&dev->dev, | |
898eb71c | 1796 | "backend does not support copying receive path\n"); |
0d160211 JF |
1797 | return -ENODEV; |
1798 | } | |
1799 | ||
f502bf2b | 1800 | err = talk_to_netback(np->xbdev, np); |
0d160211 JF |
1801 | if (err) |
1802 | return err; | |
1803 | ||
1ba37c51 | 1804 | rtnl_lock(); |
fb507934 | 1805 | netdev_update_features(dev); |
1ba37c51 | 1806 | rtnl_unlock(); |
0d160211 JF |
1807 | |
1808 | spin_lock_bh(&np->rx_lock); | |
1809 | spin_lock_irq(&np->tx_lock); | |
1810 | ||
1811 | /* Step 1: Discard all pending TX packet fragments. */ | |
1812 | xennet_release_tx_bufs(np); | |
1813 | ||
1814 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | |
1815 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | |
01c68026 IC |
1816 | skb_frag_t *frag; |
1817 | const struct page *page; | |
0d160211 JF |
1818 | if (!np->rx_skbs[i]) |
1819 | continue; | |
1820 | ||
1821 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | |
1822 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | |
1823 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | |
1824 | ||
01c68026 IC |
1825 | frag = &skb_shinfo(skb)->frags[0]; |
1826 | page = skb_frag_page(frag); | |
0d160211 JF |
1827 | gnttab_grant_foreign_access_ref( |
1828 | ref, np->xbdev->otherend_id, | |
01c68026 | 1829 | pfn_to_mfn(page_to_pfn(page)), |
0d160211 JF |
1830 | 0); |
1831 | req->gref = ref; | |
1832 | req->id = requeue_idx; | |
1833 | ||
1834 | requeue_idx++; | |
1835 | } | |
1836 | ||
1837 | np->rx.req_prod_pvt = requeue_idx; | |
1838 | ||
1839 | /* | |
1840 | * Step 3: All public and private state should now be sane. Get | |
1841 | * ready to start sending and receiving packets and give the driver | |
1842 | * domain a kick because we've probably just requeued some | |
1843 | * packets. | |
1844 | */ | |
1845 | netif_carrier_on(np->netdev); | |
d634bf2c WL |
1846 | notify_remote_via_irq(np->tx_irq); |
1847 | if (np->tx_irq != np->rx_irq) | |
1848 | notify_remote_via_irq(np->rx_irq); | |
0d160211 JF |
1849 | xennet_tx_buf_gc(dev); |
1850 | xennet_alloc_rx_buffers(dev); | |
1851 | ||
1852 | spin_unlock_irq(&np->tx_lock); | |
1853 | spin_unlock_bh(&np->rx_lock); | |
1854 | ||
1855 | return 0; | |
1856 | } | |
1857 | ||
1858 | /** | |
1859 | * Callback received when the backend's state changes. | |
1860 | */ | |
f502bf2b | 1861 | static void netback_changed(struct xenbus_device *dev, |
0d160211 JF |
1862 | enum xenbus_state backend_state) |
1863 | { | |
1b713e00 | 1864 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1865 | struct net_device *netdev = np->netdev; |
1866 | ||
1867 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
1868 | ||
1869 | switch (backend_state) { | |
1870 | case XenbusStateInitialising: | |
1871 | case XenbusStateInitialised: | |
b78c9512 NI |
1872 | case XenbusStateReconfiguring: |
1873 | case XenbusStateReconfigured: | |
0d160211 JF |
1874 | case XenbusStateUnknown: |
1875 | case XenbusStateClosed: | |
1876 | break; | |
1877 | ||
1878 | case XenbusStateInitWait: | |
1879 | if (dev->state != XenbusStateInitialising) | |
1880 | break; | |
1881 | if (xennet_connect(netdev) != 0) | |
1882 | break; | |
1883 | xenbus_switch_state(dev, XenbusStateConnected); | |
08e34eb1 LE |
1884 | break; |
1885 | ||
1886 | case XenbusStateConnected: | |
ee89bab1 | 1887 | netdev_notify_peers(netdev); |
0d160211 JF |
1888 | break; |
1889 | ||
1890 | case XenbusStateClosing: | |
1891 | xenbus_frontend_closed(dev); | |
1892 | break; | |
1893 | } | |
1894 | } | |
1895 | ||
e0ce4af9 IC |
1896 | static const struct xennet_stat { |
1897 | char name[ETH_GSTRING_LEN]; | |
1898 | u16 offset; | |
1899 | } xennet_stats[] = { | |
1900 | { | |
1901 | "rx_gso_checksum_fixup", | |
1902 | offsetof(struct netfront_info, rx_gso_checksum_fixup) | |
1903 | }, | |
1904 | }; | |
1905 | ||
1906 | static int xennet_get_sset_count(struct net_device *dev, int string_set) | |
1907 | { | |
1908 | switch (string_set) { | |
1909 | case ETH_SS_STATS: | |
1910 | return ARRAY_SIZE(xennet_stats); | |
1911 | default: | |
1912 | return -EINVAL; | |
1913 | } | |
1914 | } | |
1915 | ||
1916 | static void xennet_get_ethtool_stats(struct net_device *dev, | |
1917 | struct ethtool_stats *stats, u64 * data) | |
1918 | { | |
1919 | void *np = netdev_priv(dev); | |
1920 | int i; | |
1921 | ||
1922 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
48f26d51 | 1923 | data[i] = *(unsigned long *)(np + xennet_stats[i].offset); |
e0ce4af9 IC |
1924 | } |
1925 | ||
1926 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
1927 | { | |
1928 | int i; | |
1929 | ||
1930 | switch (stringset) { | |
1931 | case ETH_SS_STATS: | |
1932 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
1933 | memcpy(data + i * ETH_GSTRING_LEN, | |
1934 | xennet_stats[i].name, ETH_GSTRING_LEN); | |
1935 | break; | |
1936 | } | |
1937 | } | |
1938 | ||
0fc0b732 | 1939 | static const struct ethtool_ops xennet_ethtool_ops = |
0d160211 | 1940 | { |
0d160211 | 1941 | .get_link = ethtool_op_get_link, |
e0ce4af9 IC |
1942 | |
1943 | .get_sset_count = xennet_get_sset_count, | |
1944 | .get_ethtool_stats = xennet_get_ethtool_stats, | |
1945 | .get_strings = xennet_get_strings, | |
0d160211 JF |
1946 | }; |
1947 | ||
1948 | #ifdef CONFIG_SYSFS | |
1949 | static ssize_t show_rxbuf_min(struct device *dev, | |
1950 | struct device_attribute *attr, char *buf) | |
1951 | { | |
1952 | struct net_device *netdev = to_net_dev(dev); | |
1953 | struct netfront_info *info = netdev_priv(netdev); | |
1954 | ||
1955 | return sprintf(buf, "%u\n", info->rx_min_target); | |
1956 | } | |
1957 | ||
1958 | static ssize_t store_rxbuf_min(struct device *dev, | |
1959 | struct device_attribute *attr, | |
1960 | const char *buf, size_t len) | |
1961 | { | |
1962 | struct net_device *netdev = to_net_dev(dev); | |
1963 | struct netfront_info *np = netdev_priv(netdev); | |
1964 | char *endp; | |
1965 | unsigned long target; | |
1966 | ||
1967 | if (!capable(CAP_NET_ADMIN)) | |
1968 | return -EPERM; | |
1969 | ||
1970 | target = simple_strtoul(buf, &endp, 0); | |
1971 | if (endp == buf) | |
1972 | return -EBADMSG; | |
1973 | ||
1974 | if (target < RX_MIN_TARGET) | |
1975 | target = RX_MIN_TARGET; | |
1976 | if (target > RX_MAX_TARGET) | |
1977 | target = RX_MAX_TARGET; | |
1978 | ||
1979 | spin_lock_bh(&np->rx_lock); | |
1980 | if (target > np->rx_max_target) | |
1981 | np->rx_max_target = target; | |
1982 | np->rx_min_target = target; | |
1983 | if (target > np->rx_target) | |
1984 | np->rx_target = target; | |
1985 | ||
1986 | xennet_alloc_rx_buffers(netdev); | |
1987 | ||
1988 | spin_unlock_bh(&np->rx_lock); | |
1989 | return len; | |
1990 | } | |
1991 | ||
1992 | static ssize_t show_rxbuf_max(struct device *dev, | |
1993 | struct device_attribute *attr, char *buf) | |
1994 | { | |
1995 | struct net_device *netdev = to_net_dev(dev); | |
1996 | struct netfront_info *info = netdev_priv(netdev); | |
1997 | ||
1998 | return sprintf(buf, "%u\n", info->rx_max_target); | |
1999 | } | |
2000 | ||
2001 | static ssize_t store_rxbuf_max(struct device *dev, | |
2002 | struct device_attribute *attr, | |
2003 | const char *buf, size_t len) | |
2004 | { | |
2005 | struct net_device *netdev = to_net_dev(dev); | |
2006 | struct netfront_info *np = netdev_priv(netdev); | |
2007 | char *endp; | |
2008 | unsigned long target; | |
2009 | ||
2010 | if (!capable(CAP_NET_ADMIN)) | |
2011 | return -EPERM; | |
2012 | ||
2013 | target = simple_strtoul(buf, &endp, 0); | |
2014 | if (endp == buf) | |
2015 | return -EBADMSG; | |
2016 | ||
2017 | if (target < RX_MIN_TARGET) | |
2018 | target = RX_MIN_TARGET; | |
2019 | if (target > RX_MAX_TARGET) | |
2020 | target = RX_MAX_TARGET; | |
2021 | ||
2022 | spin_lock_bh(&np->rx_lock); | |
2023 | if (target < np->rx_min_target) | |
2024 | np->rx_min_target = target; | |
2025 | np->rx_max_target = target; | |
2026 | if (target < np->rx_target) | |
2027 | np->rx_target = target; | |
2028 | ||
2029 | xennet_alloc_rx_buffers(netdev); | |
2030 | ||
2031 | spin_unlock_bh(&np->rx_lock); | |
2032 | return len; | |
2033 | } | |
2034 | ||
2035 | static ssize_t show_rxbuf_cur(struct device *dev, | |
2036 | struct device_attribute *attr, char *buf) | |
2037 | { | |
2038 | struct net_device *netdev = to_net_dev(dev); | |
2039 | struct netfront_info *info = netdev_priv(netdev); | |
2040 | ||
2041 | return sprintf(buf, "%u\n", info->rx_target); | |
2042 | } | |
2043 | ||
2044 | static struct device_attribute xennet_attrs[] = { | |
2045 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | |
2046 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | |
2047 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | |
2048 | }; | |
2049 | ||
2050 | static int xennet_sysfs_addif(struct net_device *netdev) | |
2051 | { | |
2052 | int i; | |
2053 | int err; | |
2054 | ||
2055 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | |
2056 | err = device_create_file(&netdev->dev, | |
2057 | &xennet_attrs[i]); | |
2058 | if (err) | |
2059 | goto fail; | |
2060 | } | |
2061 | return 0; | |
2062 | ||
2063 | fail: | |
2064 | while (--i >= 0) | |
2065 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
2066 | return err; | |
2067 | } | |
2068 | ||
2069 | static void xennet_sysfs_delif(struct net_device *netdev) | |
2070 | { | |
2071 | int i; | |
2072 | ||
2073 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | |
2074 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
2075 | } | |
2076 | ||
2077 | #endif /* CONFIG_SYSFS */ | |
2078 | ||
73db144b | 2079 | static const struct xenbus_device_id netfront_ids[] = { |
0d160211 JF |
2080 | { "vif" }, |
2081 | { "" } | |
2082 | }; | |
2083 | ||
2084 | ||
8e0e46bb | 2085 | static int xennet_remove(struct xenbus_device *dev) |
0d160211 | 2086 | { |
1b713e00 | 2087 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
2088 | |
2089 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
2090 | ||
0d160211 JF |
2091 | xennet_disconnect_backend(info); |
2092 | ||
0d160211 JF |
2093 | xennet_sysfs_delif(info->netdev); |
2094 | ||
6bc96d04 IC |
2095 | unregister_netdev(info->netdev); |
2096 | ||
2097 | del_timer_sync(&info->rx_refill_timer); | |
2098 | ||
e00f85be | 2099 | free_percpu(info->stats); |
2100 | ||
0d160211 JF |
2101 | free_netdev(info->netdev); |
2102 | ||
2103 | return 0; | |
2104 | } | |
2105 | ||
73db144b | 2106 | static DEFINE_XENBUS_DRIVER(netfront, , |
0d160211 | 2107 | .probe = netfront_probe, |
8e0e46bb | 2108 | .remove = xennet_remove, |
0d160211 | 2109 | .resume = netfront_resume, |
f502bf2b | 2110 | .otherend_changed = netback_changed, |
73db144b | 2111 | ); |
0d160211 JF |
2112 | |
2113 | static int __init netif_init(void) | |
2114 | { | |
6e833587 | 2115 | if (!xen_domain()) |
0d160211 JF |
2116 | return -ENODEV; |
2117 | ||
e95ae5a4 | 2118 | if (xen_hvm_domain() && !xen_platform_pci_unplug) |
b9136d20 IM |
2119 | return -ENODEV; |
2120 | ||
383eda32 | 2121 | pr_info("Initialising Xen virtual ethernet driver\n"); |
0d160211 | 2122 | |
ffb78a26 | 2123 | return xenbus_register_frontend(&netfront_driver); |
0d160211 JF |
2124 | } |
2125 | module_init(netif_init); | |
2126 | ||
2127 | ||
2128 | static void __exit netif_exit(void) | |
2129 | { | |
ffb78a26 | 2130 | xenbus_unregister_driver(&netfront_driver); |
0d160211 JF |
2131 | } |
2132 | module_exit(netif_exit); | |
2133 | ||
2134 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
2135 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 2136 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 2137 | MODULE_ALIAS("xennet"); |