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0d160211 JF |
1 | /* |
2 | * Virtual network driver for conversing with remote driver backends. | |
3 | * | |
4 | * Copyright (c) 2002-2005, K A Fraser | |
5 | * Copyright (c) 2005, XenSource Ltd | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version 2 | |
9 | * as published by the Free Software Foundation; or, when distributed | |
10 | * separately from the Linux kernel or incorporated into other | |
11 | * software packages, subject to the following license: | |
12 | * | |
13 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
14 | * of this source file (the "Software"), to deal in the Software without | |
15 | * restriction, including without limitation the rights to use, copy, modify, | |
16 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
17 | * and to permit persons to whom the Software is furnished to do so, subject to | |
18 | * the following conditions: | |
19 | * | |
20 | * The above copyright notice and this permission notice shall be included in | |
21 | * all copies or substantial portions of the Software. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
29 | * IN THE SOFTWARE. | |
30 | */ | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/etherdevice.h> | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/ethtool.h> | |
38 | #include <linux/if_ether.h> | |
9ecd1a75 | 39 | #include <net/tcp.h> |
0d160211 JF |
40 | #include <linux/udp.h> |
41 | #include <linux/moduleparam.h> | |
42 | #include <linux/mm.h> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
0d160211 JF |
44 | #include <net/ip.h> |
45 | ||
ca981633 | 46 | #include <asm/xen/page.h> |
1ccbf534 | 47 | #include <xen/xen.h> |
0d160211 JF |
48 | #include <xen/xenbus.h> |
49 | #include <xen/events.h> | |
50 | #include <xen/page.h> | |
b9136d20 | 51 | #include <xen/platform_pci.h> |
0d160211 JF |
52 | #include <xen/grant_table.h> |
53 | ||
54 | #include <xen/interface/io/netif.h> | |
55 | #include <xen/interface/memory.h> | |
56 | #include <xen/interface/grant_table.h> | |
57 | ||
0fc0b732 | 58 | static const struct ethtool_ops xennet_ethtool_ops; |
0d160211 JF |
59 | |
60 | struct netfront_cb { | |
3683243b | 61 | int pull_to; |
0d160211 JF |
62 | }; |
63 | ||
64 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) | |
65 | ||
66 | #define RX_COPY_THRESHOLD 256 | |
67 | ||
68 | #define GRANT_INVALID_REF 0 | |
69 | ||
667c78af JF |
70 | #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) |
71 | #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) | |
40206dd9 | 72 | #define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256) |
0d160211 | 73 | |
e00f85be | 74 | struct netfront_stats { |
75 | u64 rx_packets; | |
76 | u64 tx_packets; | |
77 | u64 rx_bytes; | |
78 | u64 tx_bytes; | |
79 | struct u64_stats_sync syncp; | |
80 | }; | |
81 | ||
0d160211 JF |
82 | struct netfront_info { |
83 | struct list_head list; | |
84 | struct net_device *netdev; | |
85 | ||
bea3348e | 86 | struct napi_struct napi; |
0d160211 | 87 | |
0d160211 | 88 | unsigned int evtchn; |
84284d3c | 89 | struct xenbus_device *xbdev; |
0d160211 | 90 | |
84284d3c JF |
91 | spinlock_t tx_lock; |
92 | struct xen_netif_tx_front_ring tx; | |
93 | int tx_ring_ref; | |
0d160211 JF |
94 | |
95 | /* | |
96 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries | |
97 | * are linked from tx_skb_freelist through skb_entry.link. | |
98 | * | |
99 | * NB. Freelist index entries are always going to be less than | |
100 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or | |
101 | * greater than PAGE_OFFSET: we use this property to distinguish | |
102 | * them. | |
103 | */ | |
104 | union skb_entry { | |
105 | struct sk_buff *skb; | |
1ffb40b8 | 106 | unsigned long link; |
0d160211 JF |
107 | } tx_skbs[NET_TX_RING_SIZE]; |
108 | grant_ref_t gref_tx_head; | |
109 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | |
110 | unsigned tx_skb_freelist; | |
111 | ||
84284d3c JF |
112 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
113 | struct xen_netif_rx_front_ring rx; | |
114 | int rx_ring_ref; | |
115 | ||
116 | /* Receive-ring batched refills. */ | |
117 | #define RX_MIN_TARGET 8 | |
118 | #define RX_DFL_MIN_TARGET 64 | |
119 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | |
120 | unsigned rx_min_target, rx_max_target, rx_target; | |
121 | struct sk_buff_head rx_batch; | |
122 | ||
123 | struct timer_list rx_refill_timer; | |
124 | ||
0d160211 JF |
125 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
126 | grant_ref_t gref_rx_head; | |
127 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; | |
128 | ||
0d160211 JF |
129 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; |
130 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; | |
131 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; | |
e0ce4af9 IC |
132 | |
133 | /* Statistics */ | |
e00f85be | 134 | struct netfront_stats __percpu *stats; |
135 | ||
e9a799ea | 136 | unsigned long rx_gso_checksum_fixup; |
0d160211 JF |
137 | }; |
138 | ||
139 | struct netfront_rx_info { | |
140 | struct xen_netif_rx_response rx; | |
141 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; | |
142 | }; | |
143 | ||
1ffb40b8 IY |
144 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
145 | { | |
146 | list->link = id; | |
147 | } | |
148 | ||
149 | static int skb_entry_is_link(const union skb_entry *list) | |
150 | { | |
151 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); | |
807540ba | 152 | return (unsigned long)list->skb < PAGE_OFFSET; |
1ffb40b8 IY |
153 | } |
154 | ||
0d160211 JF |
155 | /* |
156 | * Access macros for acquiring freeing slots in tx_skbs[]. | |
157 | */ | |
158 | ||
159 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, | |
160 | unsigned short id) | |
161 | { | |
1ffb40b8 | 162 | skb_entry_set_link(&list[id], *head); |
0d160211 JF |
163 | *head = id; |
164 | } | |
165 | ||
166 | static unsigned short get_id_from_freelist(unsigned *head, | |
167 | union skb_entry *list) | |
168 | { | |
169 | unsigned int id = *head; | |
170 | *head = list[id].link; | |
171 | return id; | |
172 | } | |
173 | ||
174 | static int xennet_rxidx(RING_IDX idx) | |
175 | { | |
176 | return idx & (NET_RX_RING_SIZE - 1); | |
177 | } | |
178 | ||
179 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, | |
180 | RING_IDX ri) | |
181 | { | |
182 | int i = xennet_rxidx(ri); | |
183 | struct sk_buff *skb = np->rx_skbs[i]; | |
184 | np->rx_skbs[i] = NULL; | |
185 | return skb; | |
186 | } | |
187 | ||
188 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, | |
189 | RING_IDX ri) | |
190 | { | |
191 | int i = xennet_rxidx(ri); | |
192 | grant_ref_t ref = np->grant_rx_ref[i]; | |
193 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
194 | return ref; | |
195 | } | |
196 | ||
197 | #ifdef CONFIG_SYSFS | |
198 | static int xennet_sysfs_addif(struct net_device *netdev); | |
199 | static void xennet_sysfs_delif(struct net_device *netdev); | |
200 | #else /* !CONFIG_SYSFS */ | |
201 | #define xennet_sysfs_addif(dev) (0) | |
202 | #define xennet_sysfs_delif(dev) do { } while (0) | |
203 | #endif | |
204 | ||
3ad9b358 | 205 | static bool xennet_can_sg(struct net_device *dev) |
0d160211 | 206 | { |
3ad9b358 | 207 | return dev->features & NETIF_F_SG; |
0d160211 JF |
208 | } |
209 | ||
210 | ||
211 | static void rx_refill_timeout(unsigned long data) | |
212 | { | |
213 | struct net_device *dev = (struct net_device *)data; | |
bea3348e | 214 | struct netfront_info *np = netdev_priv(dev); |
288379f0 | 215 | napi_schedule(&np->napi); |
0d160211 JF |
216 | } |
217 | ||
218 | static int netfront_tx_slot_available(struct netfront_info *np) | |
219 | { | |
807540ba ED |
220 | return (np->tx.req_prod_pvt - np->tx.rsp_cons) < |
221 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2); | |
0d160211 JF |
222 | } |
223 | ||
224 | static void xennet_maybe_wake_tx(struct net_device *dev) | |
225 | { | |
226 | struct netfront_info *np = netdev_priv(dev); | |
227 | ||
228 | if (unlikely(netif_queue_stopped(dev)) && | |
229 | netfront_tx_slot_available(np) && | |
230 | likely(netif_running(dev))) | |
231 | netif_wake_queue(dev); | |
232 | } | |
233 | ||
234 | static void xennet_alloc_rx_buffers(struct net_device *dev) | |
235 | { | |
236 | unsigned short id; | |
237 | struct netfront_info *np = netdev_priv(dev); | |
238 | struct sk_buff *skb; | |
239 | struct page *page; | |
240 | int i, batch_target, notify; | |
241 | RING_IDX req_prod = np->rx.req_prod_pvt; | |
0d160211 JF |
242 | grant_ref_t ref; |
243 | unsigned long pfn; | |
244 | void *vaddr; | |
0d160211 JF |
245 | struct xen_netif_rx_request *req; |
246 | ||
247 | if (unlikely(!netif_carrier_ok(dev))) | |
248 | return; | |
249 | ||
250 | /* | |
251 | * Allocate skbuffs greedily, even though we batch updates to the | |
252 | * receive ring. This creates a less bursty demand on the memory | |
253 | * allocator, so should reduce the chance of failed allocation requests | |
254 | * both for ourself and for other kernel subsystems. | |
255 | */ | |
256 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); | |
257 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { | |
617a20bb | 258 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, |
0d160211 JF |
259 | GFP_ATOMIC | __GFP_NOWARN); |
260 | if (unlikely(!skb)) | |
261 | goto no_skb; | |
262 | ||
617a20bb IY |
263 | /* Align ip header to a 16 bytes boundary */ |
264 | skb_reserve(skb, NET_IP_ALIGN); | |
265 | ||
0d160211 JF |
266 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
267 | if (!page) { | |
268 | kfree_skb(skb); | |
269 | no_skb: | |
270 | /* Any skbuffs queued for refill? Force them out. */ | |
271 | if (i != 0) | |
272 | goto refill; | |
273 | /* Could not allocate any skbuffs. Try again later. */ | |
274 | mod_timer(&np->rx_refill_timer, | |
275 | jiffies + (HZ/10)); | |
276 | break; | |
277 | } | |
278 | ||
01c68026 | 279 | __skb_fill_page_desc(skb, 0, page, 0, 0); |
0d160211 JF |
280 | skb_shinfo(skb)->nr_frags = 1; |
281 | __skb_queue_tail(&np->rx_batch, skb); | |
282 | } | |
283 | ||
284 | /* Is the batch large enough to be worthwhile? */ | |
285 | if (i < (np->rx_target/2)) { | |
286 | if (req_prod > np->rx.sring->req_prod) | |
287 | goto push; | |
288 | return; | |
289 | } | |
290 | ||
291 | /* Adjust our fill target if we risked running out of buffers. */ | |
292 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && | |
293 | ((np->rx_target *= 2) > np->rx_max_target)) | |
294 | np->rx_target = np->rx_max_target; | |
295 | ||
296 | refill: | |
5dcddfae | 297 | for (i = 0; ; i++) { |
0d160211 JF |
298 | skb = __skb_dequeue(&np->rx_batch); |
299 | if (skb == NULL) | |
300 | break; | |
301 | ||
302 | skb->dev = dev; | |
303 | ||
304 | id = xennet_rxidx(req_prod + i); | |
305 | ||
306 | BUG_ON(np->rx_skbs[id]); | |
307 | np->rx_skbs[id] = skb; | |
308 | ||
309 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); | |
310 | BUG_ON((signed short)ref < 0); | |
311 | np->grant_rx_ref[id] = ref; | |
312 | ||
01c68026 IC |
313 | pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); |
314 | vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0])); | |
0d160211 JF |
315 | |
316 | req = RING_GET_REQUEST(&np->rx, req_prod + i); | |
317 | gnttab_grant_foreign_access_ref(ref, | |
318 | np->xbdev->otherend_id, | |
319 | pfn_to_mfn(pfn), | |
320 | 0); | |
321 | ||
322 | req->id = id; | |
323 | req->gref = ref; | |
324 | } | |
325 | ||
5dcddfae | 326 | wmb(); /* barrier so backend seens requests */ |
0d160211 JF |
327 | |
328 | /* Above is a suitable barrier to ensure backend will see requests. */ | |
329 | np->rx.req_prod_pvt = req_prod + i; | |
330 | push: | |
331 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); | |
332 | if (notify) | |
333 | notify_remote_via_irq(np->netdev->irq); | |
334 | } | |
335 | ||
336 | static int xennet_open(struct net_device *dev) | |
337 | { | |
338 | struct netfront_info *np = netdev_priv(dev); | |
339 | ||
bea3348e SH |
340 | napi_enable(&np->napi); |
341 | ||
0d160211 JF |
342 | spin_lock_bh(&np->rx_lock); |
343 | if (netif_carrier_ok(dev)) { | |
344 | xennet_alloc_rx_buffers(dev); | |
345 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; | |
346 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
288379f0 | 347 | napi_schedule(&np->napi); |
0d160211 JF |
348 | } |
349 | spin_unlock_bh(&np->rx_lock); | |
350 | ||
0b1ab1b8 | 351 | netif_start_queue(dev); |
0d160211 JF |
352 | |
353 | return 0; | |
354 | } | |
355 | ||
356 | static void xennet_tx_buf_gc(struct net_device *dev) | |
357 | { | |
358 | RING_IDX cons, prod; | |
359 | unsigned short id; | |
360 | struct netfront_info *np = netdev_priv(dev); | |
361 | struct sk_buff *skb; | |
362 | ||
363 | BUG_ON(!netif_carrier_ok(dev)); | |
364 | ||
365 | do { | |
366 | prod = np->tx.sring->rsp_prod; | |
367 | rmb(); /* Ensure we see responses up to 'rp'. */ | |
368 | ||
369 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { | |
370 | struct xen_netif_tx_response *txrsp; | |
371 | ||
372 | txrsp = RING_GET_RESPONSE(&np->tx, cons); | |
f942dc25 | 373 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
0d160211 JF |
374 | continue; |
375 | ||
376 | id = txrsp->id; | |
377 | skb = np->tx_skbs[id].skb; | |
378 | if (unlikely(gnttab_query_foreign_access( | |
379 | np->grant_tx_ref[id]) != 0)) { | |
380 | printk(KERN_ALERT "xennet_tx_buf_gc: warning " | |
381 | "-- grant still in use by backend " | |
382 | "domain.\n"); | |
383 | BUG(); | |
384 | } | |
385 | gnttab_end_foreign_access_ref( | |
386 | np->grant_tx_ref[id], GNTMAP_readonly); | |
387 | gnttab_release_grant_reference( | |
388 | &np->gref_tx_head, np->grant_tx_ref[id]); | |
389 | np->grant_tx_ref[id] = GRANT_INVALID_REF; | |
390 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); | |
391 | dev_kfree_skb_irq(skb); | |
392 | } | |
393 | ||
394 | np->tx.rsp_cons = prod; | |
395 | ||
396 | /* | |
397 | * Set a new event, then check for race with update of tx_cons. | |
398 | * Note that it is essential to schedule a callback, no matter | |
399 | * how few buffers are pending. Even if there is space in the | |
400 | * transmit ring, higher layers may be blocked because too much | |
401 | * data is outstanding: in such cases notification from Xen is | |
402 | * likely to be the only kick that we'll get. | |
403 | */ | |
404 | np->tx.sring->rsp_event = | |
405 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; | |
406 | mb(); /* update shared area */ | |
407 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); | |
408 | ||
409 | xennet_maybe_wake_tx(dev); | |
410 | } | |
411 | ||
412 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, | |
413 | struct xen_netif_tx_request *tx) | |
414 | { | |
415 | struct netfront_info *np = netdev_priv(dev); | |
416 | char *data = skb->data; | |
417 | unsigned long mfn; | |
418 | RING_IDX prod = np->tx.req_prod_pvt; | |
419 | int frags = skb_shinfo(skb)->nr_frags; | |
420 | unsigned int offset = offset_in_page(data); | |
421 | unsigned int len = skb_headlen(skb); | |
422 | unsigned int id; | |
423 | grant_ref_t ref; | |
424 | int i; | |
425 | ||
426 | /* While the header overlaps a page boundary (including being | |
427 | larger than a page), split it it into page-sized chunks. */ | |
428 | while (len > PAGE_SIZE - offset) { | |
429 | tx->size = PAGE_SIZE - offset; | |
f942dc25 | 430 | tx->flags |= XEN_NETTXF_more_data; |
0d160211 JF |
431 | len -= tx->size; |
432 | data += tx->size; | |
433 | offset = 0; | |
434 | ||
435 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
436 | np->tx_skbs[id].skb = skb_get(skb); | |
437 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
438 | tx->id = id; | |
439 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
440 | BUG_ON((signed short)ref < 0); | |
441 | ||
442 | mfn = virt_to_mfn(data); | |
443 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
444 | mfn, GNTMAP_readonly); | |
445 | ||
446 | tx->gref = np->grant_tx_ref[id] = ref; | |
447 | tx->offset = offset; | |
448 | tx->size = len; | |
449 | tx->flags = 0; | |
450 | } | |
451 | ||
452 | /* Grant backend access to each skb fragment page. */ | |
453 | for (i = 0; i < frags; i++) { | |
454 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
f36c3747 | 455 | struct page *page = skb_frag_page(frag); |
0d160211 | 456 | |
f36c3747 IC |
457 | len = skb_frag_size(frag); |
458 | offset = frag->page_offset; | |
0d160211 | 459 | |
f36c3747 IC |
460 | /* Data must not cross a page boundary. */ |
461 | BUG_ON(len + offset > PAGE_SIZE<<compound_order(page)); | |
0d160211 | 462 | |
f36c3747 IC |
463 | /* Skip unused frames from start of page */ |
464 | page += offset >> PAGE_SHIFT; | |
465 | offset &= ~PAGE_MASK; | |
0d160211 | 466 | |
f36c3747 IC |
467 | while (len > 0) { |
468 | unsigned long bytes; | |
469 | ||
470 | BUG_ON(offset >= PAGE_SIZE); | |
471 | ||
472 | bytes = PAGE_SIZE - offset; | |
473 | if (bytes > len) | |
474 | bytes = len; | |
475 | ||
476 | tx->flags |= XEN_NETTXF_more_data; | |
477 | ||
478 | id = get_id_from_freelist(&np->tx_skb_freelist, | |
479 | np->tx_skbs); | |
480 | np->tx_skbs[id].skb = skb_get(skb); | |
481 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
482 | tx->id = id; | |
483 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
484 | BUG_ON((signed short)ref < 0); | |
485 | ||
486 | mfn = pfn_to_mfn(page_to_pfn(page)); | |
487 | gnttab_grant_foreign_access_ref(ref, | |
488 | np->xbdev->otherend_id, | |
489 | mfn, GNTMAP_readonly); | |
490 | ||
491 | tx->gref = np->grant_tx_ref[id] = ref; | |
492 | tx->offset = offset; | |
493 | tx->size = bytes; | |
494 | tx->flags = 0; | |
495 | ||
496 | offset += bytes; | |
497 | len -= bytes; | |
498 | ||
499 | /* Next frame */ | |
500 | if (offset == PAGE_SIZE && len) { | |
501 | BUG_ON(!PageCompound(page)); | |
502 | page++; | |
503 | offset = 0; | |
504 | } | |
505 | } | |
0d160211 JF |
506 | } |
507 | ||
508 | np->tx.req_prod_pvt = prod; | |
509 | } | |
510 | ||
f36c3747 IC |
511 | /* |
512 | * Count how many ring slots are required to send the frags of this | |
513 | * skb. Each frag might be a compound page. | |
514 | */ | |
515 | static int xennet_count_skb_frag_slots(struct sk_buff *skb) | |
516 | { | |
517 | int i, frags = skb_shinfo(skb)->nr_frags; | |
518 | int pages = 0; | |
519 | ||
520 | for (i = 0; i < frags; i++) { | |
521 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
522 | unsigned long size = skb_frag_size(frag); | |
523 | unsigned long offset = frag->page_offset; | |
524 | ||
525 | /* Skip unused frames from start of page */ | |
526 | offset &= ~PAGE_MASK; | |
527 | ||
528 | pages += PFN_UP(offset + size); | |
529 | } | |
530 | ||
531 | return pages; | |
532 | } | |
533 | ||
0d160211 JF |
534 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
535 | { | |
536 | unsigned short id; | |
537 | struct netfront_info *np = netdev_priv(dev); | |
e00f85be | 538 | struct netfront_stats *stats = this_cpu_ptr(np->stats); |
0d160211 | 539 | struct xen_netif_tx_request *tx; |
0d160211 JF |
540 | char *data = skb->data; |
541 | RING_IDX i; | |
542 | grant_ref_t ref; | |
543 | unsigned long mfn; | |
544 | int notify; | |
f36c3747 | 545 | int slots; |
0d160211 JF |
546 | unsigned int offset = offset_in_page(data); |
547 | unsigned int len = skb_headlen(skb); | |
cf66f9d4 | 548 | unsigned long flags; |
0d160211 | 549 | |
9ecd1a75 WL |
550 | /* If skb->len is too big for wire format, drop skb and alert |
551 | * user about misconfiguration. | |
552 | */ | |
553 | if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { | |
554 | net_alert_ratelimited( | |
555 | "xennet: skb->len = %u, too big for wire format\n", | |
556 | skb->len); | |
557 | goto drop; | |
558 | } | |
559 | ||
f36c3747 IC |
560 | slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) + |
561 | xennet_count_skb_frag_slots(skb); | |
562 | if (unlikely(slots > MAX_SKB_FRAGS + 1)) { | |
563 | net_alert_ratelimited( | |
564 | "xennet: skb rides the rocket: %d slots\n", slots); | |
0d160211 JF |
565 | goto drop; |
566 | } | |
567 | ||
cf66f9d4 | 568 | spin_lock_irqsave(&np->tx_lock, flags); |
0d160211 JF |
569 | |
570 | if (unlikely(!netif_carrier_ok(dev) || | |
f36c3747 | 571 | (slots > 1 && !xennet_can_sg(dev)) || |
fc741216 | 572 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
cf66f9d4 | 573 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 JF |
574 | goto drop; |
575 | } | |
576 | ||
577 | i = np->tx.req_prod_pvt; | |
578 | ||
579 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
580 | np->tx_skbs[id].skb = skb; | |
581 | ||
582 | tx = RING_GET_REQUEST(&np->tx, i); | |
583 | ||
584 | tx->id = id; | |
585 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
586 | BUG_ON((signed short)ref < 0); | |
587 | mfn = virt_to_mfn(data); | |
588 | gnttab_grant_foreign_access_ref( | |
589 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | |
590 | tx->gref = np->grant_tx_ref[id] = ref; | |
591 | tx->offset = offset; | |
592 | tx->size = len; | |
0d160211 JF |
593 | |
594 | tx->flags = 0; | |
595 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
596 | /* local packet? */ | |
f942dc25 | 597 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
0d160211 JF |
598 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
599 | /* remote but checksummed. */ | |
f942dc25 | 600 | tx->flags |= XEN_NETTXF_data_validated; |
0d160211 JF |
601 | |
602 | if (skb_shinfo(skb)->gso_size) { | |
603 | struct xen_netif_extra_info *gso; | |
604 | ||
605 | gso = (struct xen_netif_extra_info *) | |
606 | RING_GET_REQUEST(&np->tx, ++i); | |
607 | ||
e2d617c0 | 608 | tx->flags |= XEN_NETTXF_extra_info; |
0d160211 JF |
609 | |
610 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
611 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; | |
612 | gso->u.gso.pad = 0; | |
613 | gso->u.gso.features = 0; | |
614 | ||
615 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
616 | gso->flags = 0; | |
0d160211 JF |
617 | } |
618 | ||
619 | np->tx.req_prod_pvt = i + 1; | |
620 | ||
621 | xennet_make_frags(skb, dev, tx); | |
622 | tx->size = skb->len; | |
623 | ||
624 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | |
625 | if (notify) | |
626 | notify_remote_via_irq(np->netdev->irq); | |
627 | ||
e00f85be | 628 | u64_stats_update_begin(&stats->syncp); |
629 | stats->tx_bytes += skb->len; | |
630 | stats->tx_packets++; | |
631 | u64_stats_update_end(&stats->syncp); | |
10a273a6 JF |
632 | |
633 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
0d160211 JF |
634 | xennet_tx_buf_gc(dev); |
635 | ||
636 | if (!netfront_tx_slot_available(np)) | |
637 | netif_stop_queue(dev); | |
638 | ||
cf66f9d4 | 639 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 | 640 | |
6ed10654 | 641 | return NETDEV_TX_OK; |
0d160211 JF |
642 | |
643 | drop: | |
09f75cd7 | 644 | dev->stats.tx_dropped++; |
0d160211 | 645 | dev_kfree_skb(skb); |
6ed10654 | 646 | return NETDEV_TX_OK; |
0d160211 JF |
647 | } |
648 | ||
649 | static int xennet_close(struct net_device *dev) | |
650 | { | |
651 | struct netfront_info *np = netdev_priv(dev); | |
652 | netif_stop_queue(np->netdev); | |
bea3348e | 653 | napi_disable(&np->napi); |
0d160211 JF |
654 | return 0; |
655 | } | |
656 | ||
0d160211 JF |
657 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
658 | grant_ref_t ref) | |
659 | { | |
660 | int new = xennet_rxidx(np->rx.req_prod_pvt); | |
661 | ||
662 | BUG_ON(np->rx_skbs[new]); | |
663 | np->rx_skbs[new] = skb; | |
664 | np->grant_rx_ref[new] = ref; | |
665 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | |
666 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | |
667 | np->rx.req_prod_pvt++; | |
668 | } | |
669 | ||
670 | static int xennet_get_extras(struct netfront_info *np, | |
671 | struct xen_netif_extra_info *extras, | |
672 | RING_IDX rp) | |
673 | ||
674 | { | |
675 | struct xen_netif_extra_info *extra; | |
676 | struct device *dev = &np->netdev->dev; | |
677 | RING_IDX cons = np->rx.rsp_cons; | |
678 | int err = 0; | |
679 | ||
680 | do { | |
681 | struct sk_buff *skb; | |
682 | grant_ref_t ref; | |
683 | ||
684 | if (unlikely(cons + 1 == rp)) { | |
685 | if (net_ratelimit()) | |
686 | dev_warn(dev, "Missing extra info\n"); | |
687 | err = -EBADR; | |
688 | break; | |
689 | } | |
690 | ||
691 | extra = (struct xen_netif_extra_info *) | |
692 | RING_GET_RESPONSE(&np->rx, ++cons); | |
693 | ||
694 | if (unlikely(!extra->type || | |
695 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
696 | if (net_ratelimit()) | |
697 | dev_warn(dev, "Invalid extra type: %d\n", | |
698 | extra->type); | |
699 | err = -EINVAL; | |
700 | } else { | |
701 | memcpy(&extras[extra->type - 1], extra, | |
702 | sizeof(*extra)); | |
703 | } | |
704 | ||
705 | skb = xennet_get_rx_skb(np, cons); | |
706 | ref = xennet_get_rx_ref(np, cons); | |
707 | xennet_move_rx_slot(np, skb, ref); | |
708 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | |
709 | ||
710 | np->rx.rsp_cons = cons; | |
711 | return err; | |
712 | } | |
713 | ||
714 | static int xennet_get_responses(struct netfront_info *np, | |
715 | struct netfront_rx_info *rinfo, RING_IDX rp, | |
716 | struct sk_buff_head *list) | |
717 | { | |
718 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
719 | struct xen_netif_extra_info *extras = rinfo->extras; | |
720 | struct device *dev = &np->netdev->dev; | |
721 | RING_IDX cons = np->rx.rsp_cons; | |
722 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | |
723 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | |
724 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | |
7158ff6d | 725 | int slots = 1; |
0d160211 JF |
726 | int err = 0; |
727 | unsigned long ret; | |
728 | ||
f942dc25 | 729 | if (rx->flags & XEN_NETRXF_extra_info) { |
0d160211 JF |
730 | err = xennet_get_extras(np, extras, rp); |
731 | cons = np->rx.rsp_cons; | |
732 | } | |
733 | ||
734 | for (;;) { | |
735 | if (unlikely(rx->status < 0 || | |
736 | rx->offset + rx->status > PAGE_SIZE)) { | |
737 | if (net_ratelimit()) | |
738 | dev_warn(dev, "rx->offset: %x, size: %u\n", | |
739 | rx->offset, rx->status); | |
740 | xennet_move_rx_slot(np, skb, ref); | |
741 | err = -EINVAL; | |
742 | goto next; | |
743 | } | |
744 | ||
745 | /* | |
746 | * This definitely indicates a bug, either in this driver or in | |
747 | * the backend driver. In future this should flag the bad | |
697089dc | 748 | * situation to the system controller to reboot the backend. |
0d160211 JF |
749 | */ |
750 | if (ref == GRANT_INVALID_REF) { | |
751 | if (net_ratelimit()) | |
752 | dev_warn(dev, "Bad rx response id %d.\n", | |
753 | rx->id); | |
754 | err = -EINVAL; | |
755 | goto next; | |
756 | } | |
757 | ||
758 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
759 | BUG_ON(!ret); | |
760 | ||
761 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
762 | ||
763 | __skb_queue_tail(list, skb); | |
764 | ||
765 | next: | |
f942dc25 | 766 | if (!(rx->flags & XEN_NETRXF_more_data)) |
0d160211 JF |
767 | break; |
768 | ||
7158ff6d | 769 | if (cons + slots == rp) { |
0d160211 | 770 | if (net_ratelimit()) |
7158ff6d | 771 | dev_warn(dev, "Need more slots\n"); |
0d160211 JF |
772 | err = -ENOENT; |
773 | break; | |
774 | } | |
775 | ||
7158ff6d WL |
776 | rx = RING_GET_RESPONSE(&np->rx, cons + slots); |
777 | skb = xennet_get_rx_skb(np, cons + slots); | |
778 | ref = xennet_get_rx_ref(np, cons + slots); | |
779 | slots++; | |
0d160211 JF |
780 | } |
781 | ||
7158ff6d | 782 | if (unlikely(slots > max)) { |
0d160211 | 783 | if (net_ratelimit()) |
697089dc | 784 | dev_warn(dev, "Too many slots\n"); |
0d160211 JF |
785 | err = -E2BIG; |
786 | } | |
787 | ||
788 | if (unlikely(err)) | |
7158ff6d | 789 | np->rx.rsp_cons = cons + slots; |
0d160211 JF |
790 | |
791 | return err; | |
792 | } | |
793 | ||
794 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
795 | struct xen_netif_extra_info *gso) | |
796 | { | |
797 | if (!gso->u.gso.size) { | |
798 | if (net_ratelimit()) | |
799 | printk(KERN_WARNING "GSO size must not be zero.\n"); | |
800 | return -EINVAL; | |
801 | } | |
802 | ||
803 | /* Currently only TCPv4 S.O. is supported. */ | |
804 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { | |
805 | if (net_ratelimit()) | |
806 | printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); | |
807 | return -EINVAL; | |
808 | } | |
809 | ||
810 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
811 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
812 | ||
813 | /* Header must be checked, and gso_segs computed. */ | |
814 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
815 | skb_shinfo(skb)->gso_segs = 0; | |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
820 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | |
821 | struct sk_buff *skb, | |
822 | struct sk_buff_head *list) | |
823 | { | |
824 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
825 | int nr_frags = shinfo->nr_frags; | |
826 | RING_IDX cons = np->rx.rsp_cons; | |
0d160211 JF |
827 | struct sk_buff *nskb; |
828 | ||
829 | while ((nskb = __skb_dequeue(list))) { | |
830 | struct xen_netif_rx_response *rx = | |
831 | RING_GET_RESPONSE(&np->rx, ++cons); | |
01c68026 | 832 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
0d160211 | 833 | |
01c68026 IC |
834 | __skb_fill_page_desc(skb, nr_frags, |
835 | skb_frag_page(nfrag), | |
836 | rx->offset, rx->status); | |
0d160211 JF |
837 | |
838 | skb->data_len += rx->status; | |
839 | ||
840 | skb_shinfo(nskb)->nr_frags = 0; | |
841 | kfree_skb(nskb); | |
842 | ||
0d160211 JF |
843 | nr_frags++; |
844 | } | |
845 | ||
846 | shinfo->nr_frags = nr_frags; | |
847 | return cons; | |
848 | } | |
849 | ||
e0ce4af9 | 850 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
0d160211 JF |
851 | { |
852 | struct iphdr *iph; | |
853 | unsigned char *th; | |
854 | int err = -EPROTO; | |
e0ce4af9 IC |
855 | int recalculate_partial_csum = 0; |
856 | ||
857 | /* | |
858 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
859 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
860 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
861 | * recalculate the partial checksum. | |
862 | */ | |
863 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
864 | struct netfront_info *np = netdev_priv(dev); | |
865 | np->rx_gso_checksum_fixup++; | |
866 | skb->ip_summed = CHECKSUM_PARTIAL; | |
867 | recalculate_partial_csum = 1; | |
868 | } | |
869 | ||
870 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
871 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
872 | return 0; | |
0d160211 JF |
873 | |
874 | if (skb->protocol != htons(ETH_P_IP)) | |
875 | goto out; | |
876 | ||
877 | iph = (void *)skb->data; | |
878 | th = skb->data + 4 * iph->ihl; | |
879 | if (th >= skb_tail_pointer(skb)) | |
880 | goto out; | |
881 | ||
882 | skb->csum_start = th - skb->head; | |
883 | switch (iph->protocol) { | |
884 | case IPPROTO_TCP: | |
885 | skb->csum_offset = offsetof(struct tcphdr, check); | |
e0ce4af9 IC |
886 | |
887 | if (recalculate_partial_csum) { | |
888 | struct tcphdr *tcph = (struct tcphdr *)th; | |
889 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
890 | skb->len - iph->ihl*4, | |
891 | IPPROTO_TCP, 0); | |
892 | } | |
0d160211 JF |
893 | break; |
894 | case IPPROTO_UDP: | |
895 | skb->csum_offset = offsetof(struct udphdr, check); | |
e0ce4af9 IC |
896 | |
897 | if (recalculate_partial_csum) { | |
898 | struct udphdr *udph = (struct udphdr *)th; | |
899 | udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
900 | skb->len - iph->ihl*4, | |
901 | IPPROTO_UDP, 0); | |
902 | } | |
0d160211 JF |
903 | break; |
904 | default: | |
905 | if (net_ratelimit()) | |
906 | printk(KERN_ERR "Attempting to checksum a non-" | |
907 | "TCP/UDP packet, dropping a protocol" | |
908 | " %d packet", iph->protocol); | |
909 | goto out; | |
910 | } | |
911 | ||
912 | if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) | |
913 | goto out; | |
914 | ||
915 | err = 0; | |
916 | ||
917 | out: | |
918 | return err; | |
919 | } | |
920 | ||
921 | static int handle_incoming_queue(struct net_device *dev, | |
09f75cd7 | 922 | struct sk_buff_head *rxq) |
0d160211 | 923 | { |
e00f85be | 924 | struct netfront_info *np = netdev_priv(dev); |
925 | struct netfront_stats *stats = this_cpu_ptr(np->stats); | |
0d160211 JF |
926 | int packets_dropped = 0; |
927 | struct sk_buff *skb; | |
928 | ||
929 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
3683243b | 930 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
0d160211 | 931 | |
3683243b | 932 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
0d160211 JF |
933 | |
934 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
935 | skb->protocol = eth_type_trans(skb, dev); | |
936 | ||
e0ce4af9 IC |
937 | if (checksum_setup(dev, skb)) { |
938 | kfree_skb(skb); | |
939 | packets_dropped++; | |
940 | dev->stats.rx_errors++; | |
941 | continue; | |
0d160211 JF |
942 | } |
943 | ||
e00f85be | 944 | u64_stats_update_begin(&stats->syncp); |
945 | stats->rx_packets++; | |
946 | stats->rx_bytes += skb->len; | |
947 | u64_stats_update_end(&stats->syncp); | |
0d160211 JF |
948 | |
949 | /* Pass it up. */ | |
950 | netif_receive_skb(skb); | |
0d160211 JF |
951 | } |
952 | ||
953 | return packets_dropped; | |
954 | } | |
955 | ||
bea3348e | 956 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 957 | { |
bea3348e SH |
958 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
959 | struct net_device *dev = np->netdev; | |
0d160211 JF |
960 | struct sk_buff *skb; |
961 | struct netfront_rx_info rinfo; | |
962 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
963 | struct xen_netif_extra_info *extras = rinfo.extras; | |
964 | RING_IDX i, rp; | |
bea3348e | 965 | int work_done; |
0d160211 JF |
966 | struct sk_buff_head rxq; |
967 | struct sk_buff_head errq; | |
968 | struct sk_buff_head tmpq; | |
969 | unsigned long flags; | |
0d160211 JF |
970 | int err; |
971 | ||
972 | spin_lock(&np->rx_lock); | |
973 | ||
0d160211 JF |
974 | skb_queue_head_init(&rxq); |
975 | skb_queue_head_init(&errq); | |
976 | skb_queue_head_init(&tmpq); | |
977 | ||
0d160211 JF |
978 | rp = np->rx.sring->rsp_prod; |
979 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | |
980 | ||
981 | i = np->rx.rsp_cons; | |
982 | work_done = 0; | |
983 | while ((i != rp) && (work_done < budget)) { | |
984 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | |
985 | memset(extras, 0, sizeof(rinfo.extras)); | |
986 | ||
987 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | |
988 | ||
989 | if (unlikely(err)) { | |
990 | err: | |
991 | while ((skb = __skb_dequeue(&tmpq))) | |
992 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 993 | dev->stats.rx_errors++; |
0d160211 JF |
994 | i = np->rx.rsp_cons; |
995 | continue; | |
996 | } | |
997 | ||
998 | skb = __skb_dequeue(&tmpq); | |
999 | ||
1000 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
1001 | struct xen_netif_extra_info *gso; | |
1002 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
1003 | ||
1004 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
1005 | __skb_queue_head(&tmpq, skb); | |
1006 | np->rx.rsp_cons += skb_queue_len(&tmpq); | |
1007 | goto err; | |
1008 | } | |
1009 | } | |
1010 | ||
3683243b IC |
1011 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
1012 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) | |
1013 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; | |
0d160211 | 1014 | |
3683243b IC |
1015 | skb_shinfo(skb)->frags[0].page_offset = rx->offset; |
1016 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); | |
1017 | skb->data_len = rx->status; | |
0d160211 JF |
1018 | |
1019 | i = xennet_fill_frags(np, skb, &tmpq); | |
1020 | ||
1021 | /* | |
d9a58a78 IC |
1022 | * Truesize is the actual allocation size, even if the |
1023 | * allocation is only partially used. | |
1024 | */ | |
1025 | skb->truesize += PAGE_SIZE * skb_shinfo(skb)->nr_frags; | |
0d160211 JF |
1026 | skb->len += skb->data_len; |
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 | ||
0d160211 JF |
1055 | local_irq_save(flags); |
1056 | ||
1057 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | |
1058 | if (!more_to_do) | |
288379f0 | 1059 | __napi_complete(napi); |
0d160211 JF |
1060 | |
1061 | local_irq_restore(flags); | |
1062 | } | |
1063 | ||
1064 | spin_unlock(&np->rx_lock); | |
1065 | ||
bea3348e | 1066 | return work_done; |
0d160211 JF |
1067 | } |
1068 | ||
1069 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
1070 | { | |
9ecd1a75 WL |
1071 | int max = xennet_can_sg(dev) ? |
1072 | XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER : ETH_DATA_LEN; | |
0d160211 JF |
1073 | |
1074 | if (mtu > max) | |
1075 | return -EINVAL; | |
1076 | dev->mtu = mtu; | |
1077 | return 0; | |
1078 | } | |
1079 | ||
e00f85be | 1080 | static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, |
1081 | struct rtnl_link_stats64 *tot) | |
1082 | { | |
1083 | struct netfront_info *np = netdev_priv(dev); | |
1084 | int cpu; | |
1085 | ||
1086 | for_each_possible_cpu(cpu) { | |
1087 | struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu); | |
1088 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; | |
1089 | unsigned int start; | |
1090 | ||
1091 | do { | |
1092 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
1093 | ||
1094 | rx_packets = stats->rx_packets; | |
1095 | tx_packets = stats->tx_packets; | |
1096 | rx_bytes = stats->rx_bytes; | |
1097 | tx_bytes = stats->tx_bytes; | |
1098 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); | |
1099 | ||
1100 | tot->rx_packets += rx_packets; | |
1101 | tot->tx_packets += tx_packets; | |
1102 | tot->rx_bytes += rx_bytes; | |
1103 | tot->tx_bytes += tx_bytes; | |
1104 | } | |
1105 | ||
1106 | tot->rx_errors = dev->stats.rx_errors; | |
1107 | tot->tx_dropped = dev->stats.tx_dropped; | |
1108 | ||
1109 | return tot; | |
1110 | } | |
1111 | ||
0d160211 JF |
1112 | static void xennet_release_tx_bufs(struct netfront_info *np) |
1113 | { | |
1114 | struct sk_buff *skb; | |
1115 | int i; | |
1116 | ||
1117 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1118 | /* Skip over entries which are actually freelist references */ | |
1ffb40b8 | 1119 | if (skb_entry_is_link(&np->tx_skbs[i])) |
0d160211 JF |
1120 | continue; |
1121 | ||
1122 | skb = np->tx_skbs[i].skb; | |
1123 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], | |
1124 | GNTMAP_readonly); | |
1125 | gnttab_release_grant_reference(&np->gref_tx_head, | |
1126 | np->grant_tx_ref[i]); | |
1127 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1128 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | |
1129 | dev_kfree_skb_irq(skb); | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | static void xennet_release_rx_bufs(struct netfront_info *np) | |
1134 | { | |
1135 | struct mmu_update *mmu = np->rx_mmu; | |
1136 | struct multicall_entry *mcl = np->rx_mcl; | |
1137 | struct sk_buff_head free_list; | |
1138 | struct sk_buff *skb; | |
1139 | unsigned long mfn; | |
1140 | int xfer = 0, noxfer = 0, unused = 0; | |
1141 | int id, ref; | |
1142 | ||
1143 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", | |
1144 | __func__); | |
1145 | return; | |
1146 | ||
1147 | skb_queue_head_init(&free_list); | |
1148 | ||
1149 | spin_lock_bh(&np->rx_lock); | |
1150 | ||
1151 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
1152 | ref = np->grant_rx_ref[id]; | |
1153 | if (ref == GRANT_INVALID_REF) { | |
1154 | unused++; | |
1155 | continue; | |
1156 | } | |
1157 | ||
1158 | skb = np->rx_skbs[id]; | |
1159 | mfn = gnttab_end_foreign_transfer_ref(ref); | |
1160 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
1161 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | |
1162 | ||
1163 | if (0 == mfn) { | |
1164 | skb_shinfo(skb)->nr_frags = 0; | |
1165 | dev_kfree_skb(skb); | |
1166 | noxfer++; | |
1167 | continue; | |
1168 | } | |
1169 | ||
1170 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1171 | /* Remap the page. */ | |
01c68026 IC |
1172 | const struct page *page = |
1173 | skb_frag_page(&skb_shinfo(skb)->frags[0]); | |
0d160211 JF |
1174 | unsigned long pfn = page_to_pfn(page); |
1175 | void *vaddr = page_address(page); | |
1176 | ||
1177 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, | |
1178 | mfn_pte(mfn, PAGE_KERNEL), | |
1179 | 0); | |
1180 | mcl++; | |
1181 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) | |
1182 | | MMU_MACHPHYS_UPDATE; | |
1183 | mmu->val = pfn; | |
1184 | mmu++; | |
1185 | ||
1186 | set_phys_to_machine(pfn, mfn); | |
1187 | } | |
1188 | __skb_queue_tail(&free_list, skb); | |
1189 | xfer++; | |
1190 | } | |
1191 | ||
1192 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", | |
1193 | __func__, xfer, noxfer, unused); | |
1194 | ||
1195 | if (xfer) { | |
1196 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1197 | /* Do all the remapping work and M2P updates. */ | |
1198 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, | |
79ea13ce | 1199 | NULL, DOMID_SELF); |
0d160211 JF |
1200 | mcl++; |
1201 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); | |
1202 | } | |
1203 | } | |
1204 | ||
56cfe5d0 | 1205 | __skb_queue_purge(&free_list); |
0d160211 JF |
1206 | |
1207 | spin_unlock_bh(&np->rx_lock); | |
1208 | } | |
1209 | ||
1210 | static void xennet_uninit(struct net_device *dev) | |
1211 | { | |
1212 | struct netfront_info *np = netdev_priv(dev); | |
1213 | xennet_release_tx_bufs(np); | |
1214 | xennet_release_rx_bufs(np); | |
1215 | gnttab_free_grant_references(np->gref_tx_head); | |
1216 | gnttab_free_grant_references(np->gref_rx_head); | |
1217 | } | |
1218 | ||
c8f44aff MM |
1219 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
1220 | netdev_features_t features) | |
8f7b01a1 ED |
1221 | { |
1222 | struct netfront_info *np = netdev_priv(dev); | |
1223 | int val; | |
1224 | ||
1225 | if (features & NETIF_F_SG) { | |
1226 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | |
1227 | "%d", &val) < 0) | |
1228 | val = 0; | |
1229 | ||
1230 | if (!val) | |
1231 | features &= ~NETIF_F_SG; | |
1232 | } | |
1233 | ||
1234 | if (features & NETIF_F_TSO) { | |
1235 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1236 | "feature-gso-tcpv4", "%d", &val) < 0) | |
1237 | val = 0; | |
1238 | ||
1239 | if (!val) | |
1240 | features &= ~NETIF_F_TSO; | |
1241 | } | |
1242 | ||
1243 | return features; | |
1244 | } | |
1245 | ||
c8f44aff MM |
1246 | static int xennet_set_features(struct net_device *dev, |
1247 | netdev_features_t features) | |
8f7b01a1 ED |
1248 | { |
1249 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { | |
1250 | netdev_info(dev, "Reducing MTU because no SG offload"); | |
1251 | dev->mtu = ETH_DATA_LEN; | |
1252 | } | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
cf66f9d4 KRW |
1257 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
1258 | { | |
1259 | struct net_device *dev = dev_id; | |
1260 | struct netfront_info *np = netdev_priv(dev); | |
1261 | unsigned long flags; | |
1262 | ||
1263 | spin_lock_irqsave(&np->tx_lock, flags); | |
1264 | ||
1265 | if (likely(netif_carrier_ok(dev))) { | |
1266 | xennet_tx_buf_gc(dev); | |
1267 | /* Under tx_lock: protects access to rx shared-ring indexes. */ | |
1268 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
1269 | napi_schedule(&np->napi); | |
1270 | } | |
1271 | ||
1272 | spin_unlock_irqrestore(&np->tx_lock, flags); | |
1273 | ||
1274 | return IRQ_HANDLED; | |
1275 | } | |
1276 | ||
1277 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1278 | static void xennet_poll_controller(struct net_device *dev) | |
1279 | { | |
1280 | xennet_interrupt(0, dev); | |
1281 | } | |
1282 | #endif | |
1283 | ||
0a0b9d2e SH |
1284 | static const struct net_device_ops xennet_netdev_ops = { |
1285 | .ndo_open = xennet_open, | |
1286 | .ndo_uninit = xennet_uninit, | |
1287 | .ndo_stop = xennet_close, | |
1288 | .ndo_start_xmit = xennet_start_xmit, | |
1289 | .ndo_change_mtu = xennet_change_mtu, | |
e00f85be | 1290 | .ndo_get_stats64 = xennet_get_stats64, |
0a0b9d2e SH |
1291 | .ndo_set_mac_address = eth_mac_addr, |
1292 | .ndo_validate_addr = eth_validate_addr, | |
fb507934 MM |
1293 | .ndo_fix_features = xennet_fix_features, |
1294 | .ndo_set_features = xennet_set_features, | |
cf66f9d4 KRW |
1295 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1296 | .ndo_poll_controller = xennet_poll_controller, | |
1297 | #endif | |
0a0b9d2e SH |
1298 | }; |
1299 | ||
8e0e46bb | 1300 | static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
0d160211 JF |
1301 | { |
1302 | int i, err; | |
1303 | struct net_device *netdev; | |
1304 | struct netfront_info *np; | |
1305 | ||
1306 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | |
41de8d4c | 1307 | if (!netdev) |
0d160211 | 1308 | return ERR_PTR(-ENOMEM); |
0d160211 JF |
1309 | |
1310 | np = netdev_priv(netdev); | |
1311 | np->xbdev = dev; | |
1312 | ||
1313 | spin_lock_init(&np->tx_lock); | |
1314 | spin_lock_init(&np->rx_lock); | |
1315 | ||
1316 | skb_queue_head_init(&np->rx_batch); | |
1317 | np->rx_target = RX_DFL_MIN_TARGET; | |
1318 | np->rx_min_target = RX_DFL_MIN_TARGET; | |
1319 | np->rx_max_target = RX_MAX_TARGET; | |
1320 | ||
1321 | init_timer(&np->rx_refill_timer); | |
1322 | np->rx_refill_timer.data = (unsigned long)netdev; | |
1323 | np->rx_refill_timer.function = rx_refill_timeout; | |
1324 | ||
e00f85be | 1325 | err = -ENOMEM; |
1326 | np->stats = alloc_percpu(struct netfront_stats); | |
1327 | if (np->stats == NULL) | |
1328 | goto exit; | |
1329 | ||
0d160211 JF |
1330 | /* Initialise tx_skbs as a free chain containing every entry. */ |
1331 | np->tx_skb_freelist = 0; | |
1332 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1ffb40b8 | 1333 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
0d160211 JF |
1334 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1335 | } | |
1336 | ||
1337 | /* Clear out rx_skbs */ | |
1338 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1339 | np->rx_skbs[i] = NULL; | |
1340 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1341 | } | |
1342 | ||
1343 | /* A grant for every tx ring slot */ | |
1344 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | |
1345 | &np->gref_tx_head) < 0) { | |
1346 | printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); | |
1347 | err = -ENOMEM; | |
e00f85be | 1348 | goto exit_free_stats; |
0d160211 JF |
1349 | } |
1350 | /* A grant for every rx ring slot */ | |
1351 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | |
1352 | &np->gref_rx_head) < 0) { | |
1353 | printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); | |
1354 | err = -ENOMEM; | |
1355 | goto exit_free_tx; | |
1356 | } | |
1357 | ||
0a0b9d2e SH |
1358 | netdev->netdev_ops = &xennet_netdev_ops; |
1359 | ||
bea3348e | 1360 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
fb507934 MM |
1361 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
1362 | NETIF_F_GSO_ROBUST; | |
1363 | netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO; | |
0d160211 | 1364 | |
fc3e5941 IC |
1365 | /* |
1366 | * Assume that all hw features are available for now. This set | |
1367 | * will be adjusted by the call to netdev_update_features() in | |
1368 | * xennet_connect() which is the earliest point where we can | |
1369 | * negotiate with the backend regarding supported features. | |
1370 | */ | |
1371 | netdev->features |= netdev->hw_features; | |
1372 | ||
0d160211 | 1373 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); |
0d160211 JF |
1374 | SET_NETDEV_DEV(netdev, &dev->dev); |
1375 | ||
9ecd1a75 WL |
1376 | netif_set_gso_max_size(netdev, XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER); |
1377 | ||
0d160211 JF |
1378 | np->netdev = netdev; |
1379 | ||
1380 | netif_carrier_off(netdev); | |
1381 | ||
1382 | return netdev; | |
1383 | ||
1384 | exit_free_tx: | |
1385 | gnttab_free_grant_references(np->gref_tx_head); | |
e00f85be | 1386 | exit_free_stats: |
1387 | free_percpu(np->stats); | |
0d160211 JF |
1388 | exit: |
1389 | free_netdev(netdev); | |
1390 | return ERR_PTR(err); | |
1391 | } | |
1392 | ||
1393 | /** | |
1394 | * Entry point to this code when a new device is created. Allocate the basic | |
1395 | * structures and the ring buffers for communication with the backend, and | |
1396 | * inform the backend of the appropriate details for those. | |
1397 | */ | |
8e0e46bb | 1398 | static int netfront_probe(struct xenbus_device *dev, |
1dd06ae8 | 1399 | const struct xenbus_device_id *id) |
0d160211 JF |
1400 | { |
1401 | int err; | |
1402 | struct net_device *netdev; | |
1403 | struct netfront_info *info; | |
1404 | ||
1405 | netdev = xennet_create_dev(dev); | |
1406 | if (IS_ERR(netdev)) { | |
1407 | err = PTR_ERR(netdev); | |
1408 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1409 | return err; | |
1410 | } | |
1411 | ||
1412 | info = netdev_priv(netdev); | |
1b713e00 | 1413 | dev_set_drvdata(&dev->dev, info); |
0d160211 JF |
1414 | |
1415 | err = register_netdev(info->netdev); | |
1416 | if (err) { | |
1417 | printk(KERN_WARNING "%s: register_netdev err=%d\n", | |
1418 | __func__, err); | |
1419 | goto fail; | |
1420 | } | |
1421 | ||
1422 | err = xennet_sysfs_addif(info->netdev); | |
1423 | if (err) { | |
1424 | unregister_netdev(info->netdev); | |
1425 | printk(KERN_WARNING "%s: add sysfs failed err=%d\n", | |
1426 | __func__, err); | |
1427 | goto fail; | |
1428 | } | |
1429 | ||
1430 | return 0; | |
1431 | ||
1432 | fail: | |
1433 | free_netdev(netdev); | |
1b713e00 | 1434 | dev_set_drvdata(&dev->dev, NULL); |
0d160211 JF |
1435 | return err; |
1436 | } | |
1437 | ||
1438 | static void xennet_end_access(int ref, void *page) | |
1439 | { | |
1440 | /* This frees the page as a side-effect */ | |
1441 | if (ref != GRANT_INVALID_REF) | |
1442 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1443 | } | |
1444 | ||
1445 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1446 | { | |
1447 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | |
1448 | spin_lock_bh(&info->rx_lock); | |
1449 | spin_lock_irq(&info->tx_lock); | |
1450 | netif_carrier_off(info->netdev); | |
1451 | spin_unlock_irq(&info->tx_lock); | |
1452 | spin_unlock_bh(&info->rx_lock); | |
1453 | ||
1454 | if (info->netdev->irq) | |
1455 | unbind_from_irqhandler(info->netdev->irq, info->netdev); | |
1456 | info->evtchn = info->netdev->irq = 0; | |
1457 | ||
1458 | /* End access and free the pages */ | |
1459 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | |
1460 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | |
1461 | ||
1462 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1463 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1464 | info->tx.sring = NULL; | |
1465 | info->rx.sring = NULL; | |
1466 | } | |
1467 | ||
1468 | /** | |
1469 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1470 | * driver restart. We tear down our netif structure and recreate it, but | |
1471 | * leave the device-layer structures intact so that this is transparent to the | |
1472 | * rest of the kernel. | |
1473 | */ | |
1474 | static int netfront_resume(struct xenbus_device *dev) | |
1475 | { | |
1b713e00 | 1476 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1477 | |
1478 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1479 | ||
1480 | xennet_disconnect_backend(info); | |
1481 | return 0; | |
1482 | } | |
1483 | ||
1484 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1485 | { | |
1486 | char *s, *e, *macstr; | |
1487 | int i; | |
1488 | ||
1489 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1490 | if (IS_ERR(macstr)) | |
1491 | return PTR_ERR(macstr); | |
1492 | ||
1493 | for (i = 0; i < ETH_ALEN; i++) { | |
1494 | mac[i] = simple_strtoul(s, &e, 16); | |
1495 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1496 | kfree(macstr); | |
1497 | return -ENOENT; | |
1498 | } | |
1499 | s = e+1; | |
1500 | } | |
1501 | ||
1502 | kfree(macstr); | |
1503 | return 0; | |
1504 | } | |
1505 | ||
0d160211 JF |
1506 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) |
1507 | { | |
1508 | struct xen_netif_tx_sring *txs; | |
1509 | struct xen_netif_rx_sring *rxs; | |
1510 | int err; | |
1511 | struct net_device *netdev = info->netdev; | |
1512 | ||
1513 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1514 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1515 | info->rx.sring = NULL; | |
1516 | info->tx.sring = NULL; | |
1517 | netdev->irq = 0; | |
1518 | ||
1519 | err = xen_net_read_mac(dev, netdev->dev_addr); | |
1520 | if (err) { | |
1521 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1522 | goto fail; | |
1523 | } | |
1524 | ||
a144ff09 | 1525 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1526 | if (!txs) { |
1527 | err = -ENOMEM; | |
1528 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1529 | goto fail; | |
1530 | } | |
1531 | SHARED_RING_INIT(txs); | |
1532 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | |
1533 | ||
1534 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | |
1535 | if (err < 0) { | |
1536 | free_page((unsigned long)txs); | |
1537 | goto fail; | |
1538 | } | |
1539 | ||
1540 | info->tx_ring_ref = err; | |
a144ff09 | 1541 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1542 | if (!rxs) { |
1543 | err = -ENOMEM; | |
1544 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1545 | goto fail; | |
1546 | } | |
1547 | SHARED_RING_INIT(rxs); | |
1548 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | |
1549 | ||
1550 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | |
1551 | if (err < 0) { | |
1552 | free_page((unsigned long)rxs); | |
1553 | goto fail; | |
1554 | } | |
1555 | info->rx_ring_ref = err; | |
1556 | ||
1557 | err = xenbus_alloc_evtchn(dev, &info->evtchn); | |
1558 | if (err) | |
1559 | goto fail; | |
1560 | ||
1561 | err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, | |
ab392d2d | 1562 | 0, netdev->name, netdev); |
0d160211 JF |
1563 | if (err < 0) |
1564 | goto fail; | |
1565 | netdev->irq = err; | |
1566 | return 0; | |
1567 | ||
1568 | fail: | |
1569 | return err; | |
1570 | } | |
1571 | ||
1572 | /* Common code used when first setting up, and when resuming. */ | |
f502bf2b | 1573 | static int talk_to_netback(struct xenbus_device *dev, |
0d160211 JF |
1574 | struct netfront_info *info) |
1575 | { | |
1576 | const char *message; | |
1577 | struct xenbus_transaction xbt; | |
1578 | int err; | |
1579 | ||
1580 | /* Create shared ring, alloc event channel. */ | |
1581 | err = setup_netfront(dev, info); | |
1582 | if (err) | |
1583 | goto out; | |
1584 | ||
1585 | again: | |
1586 | err = xenbus_transaction_start(&xbt); | |
1587 | if (err) { | |
1588 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1589 | goto destroy_ring; | |
1590 | } | |
1591 | ||
1592 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | |
1593 | info->tx_ring_ref); | |
1594 | if (err) { | |
1595 | message = "writing tx ring-ref"; | |
1596 | goto abort_transaction; | |
1597 | } | |
1598 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | |
1599 | info->rx_ring_ref); | |
1600 | if (err) { | |
1601 | message = "writing rx ring-ref"; | |
1602 | goto abort_transaction; | |
1603 | } | |
1604 | err = xenbus_printf(xbt, dev->nodename, | |
1605 | "event-channel", "%u", info->evtchn); | |
1606 | if (err) { | |
1607 | message = "writing event-channel"; | |
1608 | goto abort_transaction; | |
1609 | } | |
1610 | ||
1611 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | |
1612 | 1); | |
1613 | if (err) { | |
1614 | message = "writing request-rx-copy"; | |
1615 | goto abort_transaction; | |
1616 | } | |
1617 | ||
1618 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1619 | if (err) { | |
1620 | message = "writing feature-rx-notify"; | |
1621 | goto abort_transaction; | |
1622 | } | |
1623 | ||
1624 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1625 | if (err) { | |
1626 | message = "writing feature-sg"; | |
1627 | goto abort_transaction; | |
1628 | } | |
1629 | ||
1630 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1631 | if (err) { | |
1632 | message = "writing feature-gso-tcpv4"; | |
1633 | goto abort_transaction; | |
1634 | } | |
1635 | ||
1636 | err = xenbus_transaction_end(xbt, 0); | |
1637 | if (err) { | |
1638 | if (err == -EAGAIN) | |
1639 | goto again; | |
1640 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1641 | goto destroy_ring; | |
1642 | } | |
1643 | ||
1644 | return 0; | |
1645 | ||
1646 | abort_transaction: | |
1647 | xenbus_transaction_end(xbt, 1); | |
1648 | xenbus_dev_fatal(dev, err, "%s", message); | |
1649 | destroy_ring: | |
1650 | xennet_disconnect_backend(info); | |
1651 | out: | |
1652 | return err; | |
1653 | } | |
1654 | ||
0d160211 JF |
1655 | static int xennet_connect(struct net_device *dev) |
1656 | { | |
1657 | struct netfront_info *np = netdev_priv(dev); | |
1658 | int i, requeue_idx, err; | |
1659 | struct sk_buff *skb; | |
1660 | grant_ref_t ref; | |
1661 | struct xen_netif_rx_request *req; | |
1662 | unsigned int feature_rx_copy; | |
1663 | ||
1664 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1665 | "feature-rx-copy", "%u", &feature_rx_copy); | |
1666 | if (err != 1) | |
1667 | feature_rx_copy = 0; | |
1668 | ||
1669 | if (!feature_rx_copy) { | |
1670 | dev_info(&dev->dev, | |
898eb71c | 1671 | "backend does not support copying receive path\n"); |
0d160211 JF |
1672 | return -ENODEV; |
1673 | } | |
1674 | ||
f502bf2b | 1675 | err = talk_to_netback(np->xbdev, np); |
0d160211 JF |
1676 | if (err) |
1677 | return err; | |
1678 | ||
1ba37c51 | 1679 | rtnl_lock(); |
fb507934 | 1680 | netdev_update_features(dev); |
1ba37c51 | 1681 | rtnl_unlock(); |
0d160211 JF |
1682 | |
1683 | spin_lock_bh(&np->rx_lock); | |
1684 | spin_lock_irq(&np->tx_lock); | |
1685 | ||
1686 | /* Step 1: Discard all pending TX packet fragments. */ | |
1687 | xennet_release_tx_bufs(np); | |
1688 | ||
1689 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | |
1690 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | |
01c68026 IC |
1691 | skb_frag_t *frag; |
1692 | const struct page *page; | |
0d160211 JF |
1693 | if (!np->rx_skbs[i]) |
1694 | continue; | |
1695 | ||
1696 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | |
1697 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | |
1698 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | |
1699 | ||
01c68026 IC |
1700 | frag = &skb_shinfo(skb)->frags[0]; |
1701 | page = skb_frag_page(frag); | |
0d160211 JF |
1702 | gnttab_grant_foreign_access_ref( |
1703 | ref, np->xbdev->otherend_id, | |
01c68026 | 1704 | pfn_to_mfn(page_to_pfn(page)), |
0d160211 JF |
1705 | 0); |
1706 | req->gref = ref; | |
1707 | req->id = requeue_idx; | |
1708 | ||
1709 | requeue_idx++; | |
1710 | } | |
1711 | ||
1712 | np->rx.req_prod_pvt = requeue_idx; | |
1713 | ||
1714 | /* | |
1715 | * Step 3: All public and private state should now be sane. Get | |
1716 | * ready to start sending and receiving packets and give the driver | |
1717 | * domain a kick because we've probably just requeued some | |
1718 | * packets. | |
1719 | */ | |
1720 | netif_carrier_on(np->netdev); | |
1721 | notify_remote_via_irq(np->netdev->irq); | |
1722 | xennet_tx_buf_gc(dev); | |
1723 | xennet_alloc_rx_buffers(dev); | |
1724 | ||
1725 | spin_unlock_irq(&np->tx_lock); | |
1726 | spin_unlock_bh(&np->rx_lock); | |
1727 | ||
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | /** | |
1732 | * Callback received when the backend's state changes. | |
1733 | */ | |
f502bf2b | 1734 | static void netback_changed(struct xenbus_device *dev, |
0d160211 JF |
1735 | enum xenbus_state backend_state) |
1736 | { | |
1b713e00 | 1737 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1738 | struct net_device *netdev = np->netdev; |
1739 | ||
1740 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
1741 | ||
1742 | switch (backend_state) { | |
1743 | case XenbusStateInitialising: | |
1744 | case XenbusStateInitialised: | |
b78c9512 NI |
1745 | case XenbusStateReconfiguring: |
1746 | case XenbusStateReconfigured: | |
0d160211 JF |
1747 | case XenbusStateUnknown: |
1748 | case XenbusStateClosed: | |
1749 | break; | |
1750 | ||
1751 | case XenbusStateInitWait: | |
1752 | if (dev->state != XenbusStateInitialising) | |
1753 | break; | |
1754 | if (xennet_connect(netdev) != 0) | |
1755 | break; | |
1756 | xenbus_switch_state(dev, XenbusStateConnected); | |
08e34eb1 LE |
1757 | break; |
1758 | ||
1759 | case XenbusStateConnected: | |
ee89bab1 | 1760 | netdev_notify_peers(netdev); |
0d160211 JF |
1761 | break; |
1762 | ||
1763 | case XenbusStateClosing: | |
1764 | xenbus_frontend_closed(dev); | |
1765 | break; | |
1766 | } | |
1767 | } | |
1768 | ||
e0ce4af9 IC |
1769 | static const struct xennet_stat { |
1770 | char name[ETH_GSTRING_LEN]; | |
1771 | u16 offset; | |
1772 | } xennet_stats[] = { | |
1773 | { | |
1774 | "rx_gso_checksum_fixup", | |
1775 | offsetof(struct netfront_info, rx_gso_checksum_fixup) | |
1776 | }, | |
1777 | }; | |
1778 | ||
1779 | static int xennet_get_sset_count(struct net_device *dev, int string_set) | |
1780 | { | |
1781 | switch (string_set) { | |
1782 | case ETH_SS_STATS: | |
1783 | return ARRAY_SIZE(xennet_stats); | |
1784 | default: | |
1785 | return -EINVAL; | |
1786 | } | |
1787 | } | |
1788 | ||
1789 | static void xennet_get_ethtool_stats(struct net_device *dev, | |
1790 | struct ethtool_stats *stats, u64 * data) | |
1791 | { | |
1792 | void *np = netdev_priv(dev); | |
1793 | int i; | |
1794 | ||
1795 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
48f26d51 | 1796 | data[i] = *(unsigned long *)(np + xennet_stats[i].offset); |
e0ce4af9 IC |
1797 | } |
1798 | ||
1799 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
1800 | { | |
1801 | int i; | |
1802 | ||
1803 | switch (stringset) { | |
1804 | case ETH_SS_STATS: | |
1805 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
1806 | memcpy(data + i * ETH_GSTRING_LEN, | |
1807 | xennet_stats[i].name, ETH_GSTRING_LEN); | |
1808 | break; | |
1809 | } | |
1810 | } | |
1811 | ||
0fc0b732 | 1812 | static const struct ethtool_ops xennet_ethtool_ops = |
0d160211 | 1813 | { |
0d160211 | 1814 | .get_link = ethtool_op_get_link, |
e0ce4af9 IC |
1815 | |
1816 | .get_sset_count = xennet_get_sset_count, | |
1817 | .get_ethtool_stats = xennet_get_ethtool_stats, | |
1818 | .get_strings = xennet_get_strings, | |
0d160211 JF |
1819 | }; |
1820 | ||
1821 | #ifdef CONFIG_SYSFS | |
1822 | static ssize_t show_rxbuf_min(struct device *dev, | |
1823 | struct device_attribute *attr, char *buf) | |
1824 | { | |
1825 | struct net_device *netdev = to_net_dev(dev); | |
1826 | struct netfront_info *info = netdev_priv(netdev); | |
1827 | ||
1828 | return sprintf(buf, "%u\n", info->rx_min_target); | |
1829 | } | |
1830 | ||
1831 | static ssize_t store_rxbuf_min(struct device *dev, | |
1832 | struct device_attribute *attr, | |
1833 | const char *buf, size_t len) | |
1834 | { | |
1835 | struct net_device *netdev = to_net_dev(dev); | |
1836 | struct netfront_info *np = netdev_priv(netdev); | |
1837 | char *endp; | |
1838 | unsigned long target; | |
1839 | ||
1840 | if (!capable(CAP_NET_ADMIN)) | |
1841 | return -EPERM; | |
1842 | ||
1843 | target = simple_strtoul(buf, &endp, 0); | |
1844 | if (endp == buf) | |
1845 | return -EBADMSG; | |
1846 | ||
1847 | if (target < RX_MIN_TARGET) | |
1848 | target = RX_MIN_TARGET; | |
1849 | if (target > RX_MAX_TARGET) | |
1850 | target = RX_MAX_TARGET; | |
1851 | ||
1852 | spin_lock_bh(&np->rx_lock); | |
1853 | if (target > np->rx_max_target) | |
1854 | np->rx_max_target = target; | |
1855 | np->rx_min_target = target; | |
1856 | if (target > np->rx_target) | |
1857 | np->rx_target = target; | |
1858 | ||
1859 | xennet_alloc_rx_buffers(netdev); | |
1860 | ||
1861 | spin_unlock_bh(&np->rx_lock); | |
1862 | return len; | |
1863 | } | |
1864 | ||
1865 | static ssize_t show_rxbuf_max(struct device *dev, | |
1866 | struct device_attribute *attr, char *buf) | |
1867 | { | |
1868 | struct net_device *netdev = to_net_dev(dev); | |
1869 | struct netfront_info *info = netdev_priv(netdev); | |
1870 | ||
1871 | return sprintf(buf, "%u\n", info->rx_max_target); | |
1872 | } | |
1873 | ||
1874 | static ssize_t store_rxbuf_max(struct device *dev, | |
1875 | struct device_attribute *attr, | |
1876 | const char *buf, size_t len) | |
1877 | { | |
1878 | struct net_device *netdev = to_net_dev(dev); | |
1879 | struct netfront_info *np = netdev_priv(netdev); | |
1880 | char *endp; | |
1881 | unsigned long target; | |
1882 | ||
1883 | if (!capable(CAP_NET_ADMIN)) | |
1884 | return -EPERM; | |
1885 | ||
1886 | target = simple_strtoul(buf, &endp, 0); | |
1887 | if (endp == buf) | |
1888 | return -EBADMSG; | |
1889 | ||
1890 | if (target < RX_MIN_TARGET) | |
1891 | target = RX_MIN_TARGET; | |
1892 | if (target > RX_MAX_TARGET) | |
1893 | target = RX_MAX_TARGET; | |
1894 | ||
1895 | spin_lock_bh(&np->rx_lock); | |
1896 | if (target < np->rx_min_target) | |
1897 | np->rx_min_target = target; | |
1898 | np->rx_max_target = target; | |
1899 | if (target < np->rx_target) | |
1900 | np->rx_target = target; | |
1901 | ||
1902 | xennet_alloc_rx_buffers(netdev); | |
1903 | ||
1904 | spin_unlock_bh(&np->rx_lock); | |
1905 | return len; | |
1906 | } | |
1907 | ||
1908 | static ssize_t show_rxbuf_cur(struct device *dev, | |
1909 | struct device_attribute *attr, char *buf) | |
1910 | { | |
1911 | struct net_device *netdev = to_net_dev(dev); | |
1912 | struct netfront_info *info = netdev_priv(netdev); | |
1913 | ||
1914 | return sprintf(buf, "%u\n", info->rx_target); | |
1915 | } | |
1916 | ||
1917 | static struct device_attribute xennet_attrs[] = { | |
1918 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | |
1919 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | |
1920 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | |
1921 | }; | |
1922 | ||
1923 | static int xennet_sysfs_addif(struct net_device *netdev) | |
1924 | { | |
1925 | int i; | |
1926 | int err; | |
1927 | ||
1928 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | |
1929 | err = device_create_file(&netdev->dev, | |
1930 | &xennet_attrs[i]); | |
1931 | if (err) | |
1932 | goto fail; | |
1933 | } | |
1934 | return 0; | |
1935 | ||
1936 | fail: | |
1937 | while (--i >= 0) | |
1938 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1939 | return err; | |
1940 | } | |
1941 | ||
1942 | static void xennet_sysfs_delif(struct net_device *netdev) | |
1943 | { | |
1944 | int i; | |
1945 | ||
1946 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | |
1947 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1948 | } | |
1949 | ||
1950 | #endif /* CONFIG_SYSFS */ | |
1951 | ||
73db144b | 1952 | static const struct xenbus_device_id netfront_ids[] = { |
0d160211 JF |
1953 | { "vif" }, |
1954 | { "" } | |
1955 | }; | |
1956 | ||
1957 | ||
8e0e46bb | 1958 | static int xennet_remove(struct xenbus_device *dev) |
0d160211 | 1959 | { |
1b713e00 | 1960 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1961 | |
1962 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1963 | ||
0d160211 JF |
1964 | xennet_disconnect_backend(info); |
1965 | ||
0d160211 JF |
1966 | xennet_sysfs_delif(info->netdev); |
1967 | ||
6bc96d04 IC |
1968 | unregister_netdev(info->netdev); |
1969 | ||
1970 | del_timer_sync(&info->rx_refill_timer); | |
1971 | ||
e00f85be | 1972 | free_percpu(info->stats); |
1973 | ||
0d160211 JF |
1974 | free_netdev(info->netdev); |
1975 | ||
1976 | return 0; | |
1977 | } | |
1978 | ||
73db144b | 1979 | static DEFINE_XENBUS_DRIVER(netfront, , |
0d160211 | 1980 | .probe = netfront_probe, |
8e0e46bb | 1981 | .remove = xennet_remove, |
0d160211 | 1982 | .resume = netfront_resume, |
f502bf2b | 1983 | .otherend_changed = netback_changed, |
73db144b | 1984 | ); |
0d160211 JF |
1985 | |
1986 | static int __init netif_init(void) | |
1987 | { | |
6e833587 | 1988 | if (!xen_domain()) |
0d160211 JF |
1989 | return -ENODEV; |
1990 | ||
e95ae5a4 | 1991 | if (xen_hvm_domain() && !xen_platform_pci_unplug) |
b9136d20 IM |
1992 | return -ENODEV; |
1993 | ||
0d160211 JF |
1994 | printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); |
1995 | ||
ffb78a26 | 1996 | return xenbus_register_frontend(&netfront_driver); |
0d160211 JF |
1997 | } |
1998 | module_init(netif_init); | |
1999 | ||
2000 | ||
2001 | static void __exit netif_exit(void) | |
2002 | { | |
ffb78a26 | 2003 | xenbus_unregister_driver(&netfront_driver); |
0d160211 JF |
2004 | } |
2005 | module_exit(netif_exit); | |
2006 | ||
2007 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
2008 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 2009 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 2010 | MODULE_ALIAS("xennet"); |