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0d160211 JF |
1 | /* |
2 | * Virtual network driver for conversing with remote driver backends. | |
3 | * | |
4 | * Copyright (c) 2002-2005, K A Fraser | |
5 | * Copyright (c) 2005, XenSource Ltd | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version 2 | |
9 | * as published by the Free Software Foundation; or, when distributed | |
10 | * separately from the Linux kernel or incorporated into other | |
11 | * software packages, subject to the following license: | |
12 | * | |
13 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
14 | * of this source file (the "Software"), to deal in the Software without | |
15 | * restriction, including without limitation the rights to use, copy, modify, | |
16 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
17 | * and to permit persons to whom the Software is furnished to do so, subject to | |
18 | * the following conditions: | |
19 | * | |
20 | * The above copyright notice and this permission notice shall be included in | |
21 | * all copies or substantial portions of the Software. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
29 | * IN THE SOFTWARE. | |
30 | */ | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/etherdevice.h> | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/ethtool.h> | |
38 | #include <linux/if_ether.h> | |
39 | #include <linux/tcp.h> | |
40 | #include <linux/udp.h> | |
41 | #include <linux/moduleparam.h> | |
42 | #include <linux/mm.h> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
0d160211 JF |
44 | #include <net/ip.h> |
45 | ||
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 | |
f36c3747 IC |
550 | slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) + |
551 | xennet_count_skb_frag_slots(skb); | |
552 | if (unlikely(slots > MAX_SKB_FRAGS + 1)) { | |
553 | net_alert_ratelimited( | |
554 | "xennet: skb rides the rocket: %d slots\n", slots); | |
0d160211 JF |
555 | goto drop; |
556 | } | |
557 | ||
cf66f9d4 | 558 | spin_lock_irqsave(&np->tx_lock, flags); |
0d160211 JF |
559 | |
560 | if (unlikely(!netif_carrier_ok(dev) || | |
f36c3747 | 561 | (slots > 1 && !xennet_can_sg(dev)) || |
fc741216 | 562 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
cf66f9d4 | 563 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 JF |
564 | goto drop; |
565 | } | |
566 | ||
567 | i = np->tx.req_prod_pvt; | |
568 | ||
569 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
570 | np->tx_skbs[id].skb = skb; | |
571 | ||
572 | tx = RING_GET_REQUEST(&np->tx, i); | |
573 | ||
574 | tx->id = id; | |
575 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
576 | BUG_ON((signed short)ref < 0); | |
577 | mfn = virt_to_mfn(data); | |
578 | gnttab_grant_foreign_access_ref( | |
579 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | |
580 | tx->gref = np->grant_tx_ref[id] = ref; | |
581 | tx->offset = offset; | |
582 | tx->size = len; | |
0d160211 JF |
583 | |
584 | tx->flags = 0; | |
585 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
586 | /* local packet? */ | |
f942dc25 | 587 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
0d160211 JF |
588 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
589 | /* remote but checksummed. */ | |
f942dc25 | 590 | tx->flags |= XEN_NETTXF_data_validated; |
0d160211 JF |
591 | |
592 | if (skb_shinfo(skb)->gso_size) { | |
593 | struct xen_netif_extra_info *gso; | |
594 | ||
595 | gso = (struct xen_netif_extra_info *) | |
596 | RING_GET_REQUEST(&np->tx, ++i); | |
597 | ||
e2d617c0 | 598 | tx->flags |= XEN_NETTXF_extra_info; |
0d160211 JF |
599 | |
600 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
601 | gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4; | |
602 | gso->u.gso.pad = 0; | |
603 | gso->u.gso.features = 0; | |
604 | ||
605 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
606 | gso->flags = 0; | |
0d160211 JF |
607 | } |
608 | ||
609 | np->tx.req_prod_pvt = i + 1; | |
610 | ||
611 | xennet_make_frags(skb, dev, tx); | |
612 | tx->size = skb->len; | |
613 | ||
614 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | |
615 | if (notify) | |
616 | notify_remote_via_irq(np->netdev->irq); | |
617 | ||
e00f85be | 618 | u64_stats_update_begin(&stats->syncp); |
619 | stats->tx_bytes += skb->len; | |
620 | stats->tx_packets++; | |
621 | u64_stats_update_end(&stats->syncp); | |
10a273a6 JF |
622 | |
623 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
0d160211 JF |
624 | xennet_tx_buf_gc(dev); |
625 | ||
626 | if (!netfront_tx_slot_available(np)) | |
627 | netif_stop_queue(dev); | |
628 | ||
cf66f9d4 | 629 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 | 630 | |
6ed10654 | 631 | return NETDEV_TX_OK; |
0d160211 JF |
632 | |
633 | drop: | |
09f75cd7 | 634 | dev->stats.tx_dropped++; |
0d160211 | 635 | dev_kfree_skb(skb); |
6ed10654 | 636 | return NETDEV_TX_OK; |
0d160211 JF |
637 | } |
638 | ||
639 | static int xennet_close(struct net_device *dev) | |
640 | { | |
641 | struct netfront_info *np = netdev_priv(dev); | |
642 | netif_stop_queue(np->netdev); | |
bea3348e | 643 | napi_disable(&np->napi); |
0d160211 JF |
644 | return 0; |
645 | } | |
646 | ||
0d160211 JF |
647 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
648 | grant_ref_t ref) | |
649 | { | |
650 | int new = xennet_rxidx(np->rx.req_prod_pvt); | |
651 | ||
652 | BUG_ON(np->rx_skbs[new]); | |
653 | np->rx_skbs[new] = skb; | |
654 | np->grant_rx_ref[new] = ref; | |
655 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | |
656 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | |
657 | np->rx.req_prod_pvt++; | |
658 | } | |
659 | ||
660 | static int xennet_get_extras(struct netfront_info *np, | |
661 | struct xen_netif_extra_info *extras, | |
662 | RING_IDX rp) | |
663 | ||
664 | { | |
665 | struct xen_netif_extra_info *extra; | |
666 | struct device *dev = &np->netdev->dev; | |
667 | RING_IDX cons = np->rx.rsp_cons; | |
668 | int err = 0; | |
669 | ||
670 | do { | |
671 | struct sk_buff *skb; | |
672 | grant_ref_t ref; | |
673 | ||
674 | if (unlikely(cons + 1 == rp)) { | |
675 | if (net_ratelimit()) | |
676 | dev_warn(dev, "Missing extra info\n"); | |
677 | err = -EBADR; | |
678 | break; | |
679 | } | |
680 | ||
681 | extra = (struct xen_netif_extra_info *) | |
682 | RING_GET_RESPONSE(&np->rx, ++cons); | |
683 | ||
684 | if (unlikely(!extra->type || | |
685 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
686 | if (net_ratelimit()) | |
687 | dev_warn(dev, "Invalid extra type: %d\n", | |
688 | extra->type); | |
689 | err = -EINVAL; | |
690 | } else { | |
691 | memcpy(&extras[extra->type - 1], extra, | |
692 | sizeof(*extra)); | |
693 | } | |
694 | ||
695 | skb = xennet_get_rx_skb(np, cons); | |
696 | ref = xennet_get_rx_ref(np, cons); | |
697 | xennet_move_rx_slot(np, skb, ref); | |
698 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | |
699 | ||
700 | np->rx.rsp_cons = cons; | |
701 | return err; | |
702 | } | |
703 | ||
704 | static int xennet_get_responses(struct netfront_info *np, | |
705 | struct netfront_rx_info *rinfo, RING_IDX rp, | |
706 | struct sk_buff_head *list) | |
707 | { | |
708 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
709 | struct xen_netif_extra_info *extras = rinfo->extras; | |
710 | struct device *dev = &np->netdev->dev; | |
711 | RING_IDX cons = np->rx.rsp_cons; | |
712 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | |
713 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | |
714 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | |
715 | int frags = 1; | |
716 | int err = 0; | |
717 | unsigned long ret; | |
718 | ||
f942dc25 | 719 | if (rx->flags & XEN_NETRXF_extra_info) { |
0d160211 JF |
720 | err = xennet_get_extras(np, extras, rp); |
721 | cons = np->rx.rsp_cons; | |
722 | } | |
723 | ||
724 | for (;;) { | |
725 | if (unlikely(rx->status < 0 || | |
726 | rx->offset + rx->status > PAGE_SIZE)) { | |
727 | if (net_ratelimit()) | |
728 | dev_warn(dev, "rx->offset: %x, size: %u\n", | |
729 | rx->offset, rx->status); | |
730 | xennet_move_rx_slot(np, skb, ref); | |
731 | err = -EINVAL; | |
732 | goto next; | |
733 | } | |
734 | ||
735 | /* | |
736 | * This definitely indicates a bug, either in this driver or in | |
737 | * the backend driver. In future this should flag the bad | |
738 | * situation to the system controller to reboot the backed. | |
739 | */ | |
740 | if (ref == GRANT_INVALID_REF) { | |
741 | if (net_ratelimit()) | |
742 | dev_warn(dev, "Bad rx response id %d.\n", | |
743 | rx->id); | |
744 | err = -EINVAL; | |
745 | goto next; | |
746 | } | |
747 | ||
748 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
749 | BUG_ON(!ret); | |
750 | ||
751 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
752 | ||
753 | __skb_queue_tail(list, skb); | |
754 | ||
755 | next: | |
f942dc25 | 756 | if (!(rx->flags & XEN_NETRXF_more_data)) |
0d160211 JF |
757 | break; |
758 | ||
759 | if (cons + frags == rp) { | |
760 | if (net_ratelimit()) | |
761 | dev_warn(dev, "Need more frags\n"); | |
762 | err = -ENOENT; | |
763 | break; | |
764 | } | |
765 | ||
766 | rx = RING_GET_RESPONSE(&np->rx, cons + frags); | |
767 | skb = xennet_get_rx_skb(np, cons + frags); | |
768 | ref = xennet_get_rx_ref(np, cons + frags); | |
769 | frags++; | |
770 | } | |
771 | ||
772 | if (unlikely(frags > max)) { | |
773 | if (net_ratelimit()) | |
774 | dev_warn(dev, "Too many frags\n"); | |
775 | err = -E2BIG; | |
776 | } | |
777 | ||
778 | if (unlikely(err)) | |
779 | np->rx.rsp_cons = cons + frags; | |
780 | ||
781 | return err; | |
782 | } | |
783 | ||
784 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
785 | struct xen_netif_extra_info *gso) | |
786 | { | |
787 | if (!gso->u.gso.size) { | |
788 | if (net_ratelimit()) | |
789 | printk(KERN_WARNING "GSO size must not be zero.\n"); | |
790 | return -EINVAL; | |
791 | } | |
792 | ||
793 | /* Currently only TCPv4 S.O. is supported. */ | |
794 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) { | |
795 | if (net_ratelimit()) | |
796 | printk(KERN_WARNING "Bad GSO type %d.\n", gso->u.gso.type); | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
801 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
802 | ||
803 | /* Header must be checked, and gso_segs computed. */ | |
804 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
805 | skb_shinfo(skb)->gso_segs = 0; | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
810 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | |
811 | struct sk_buff *skb, | |
812 | struct sk_buff_head *list) | |
813 | { | |
814 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
815 | int nr_frags = shinfo->nr_frags; | |
816 | RING_IDX cons = np->rx.rsp_cons; | |
0d160211 JF |
817 | struct sk_buff *nskb; |
818 | ||
819 | while ((nskb = __skb_dequeue(list))) { | |
820 | struct xen_netif_rx_response *rx = | |
821 | RING_GET_RESPONSE(&np->rx, ++cons); | |
01c68026 | 822 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
0d160211 | 823 | |
01c68026 IC |
824 | __skb_fill_page_desc(skb, nr_frags, |
825 | skb_frag_page(nfrag), | |
826 | rx->offset, rx->status); | |
0d160211 JF |
827 | |
828 | skb->data_len += rx->status; | |
829 | ||
830 | skb_shinfo(nskb)->nr_frags = 0; | |
831 | kfree_skb(nskb); | |
832 | ||
0d160211 JF |
833 | nr_frags++; |
834 | } | |
835 | ||
836 | shinfo->nr_frags = nr_frags; | |
837 | return cons; | |
838 | } | |
839 | ||
e0ce4af9 | 840 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
0d160211 JF |
841 | { |
842 | struct iphdr *iph; | |
843 | unsigned char *th; | |
844 | int err = -EPROTO; | |
e0ce4af9 IC |
845 | int recalculate_partial_csum = 0; |
846 | ||
847 | /* | |
848 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
849 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
850 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
851 | * recalculate the partial checksum. | |
852 | */ | |
853 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
854 | struct netfront_info *np = netdev_priv(dev); | |
855 | np->rx_gso_checksum_fixup++; | |
856 | skb->ip_summed = CHECKSUM_PARTIAL; | |
857 | recalculate_partial_csum = 1; | |
858 | } | |
859 | ||
860 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
861 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
862 | return 0; | |
0d160211 JF |
863 | |
864 | if (skb->protocol != htons(ETH_P_IP)) | |
865 | goto out; | |
866 | ||
867 | iph = (void *)skb->data; | |
868 | th = skb->data + 4 * iph->ihl; | |
869 | if (th >= skb_tail_pointer(skb)) | |
870 | goto out; | |
871 | ||
872 | skb->csum_start = th - skb->head; | |
873 | switch (iph->protocol) { | |
874 | case IPPROTO_TCP: | |
875 | skb->csum_offset = offsetof(struct tcphdr, check); | |
e0ce4af9 IC |
876 | |
877 | if (recalculate_partial_csum) { | |
878 | struct tcphdr *tcph = (struct tcphdr *)th; | |
879 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
880 | skb->len - iph->ihl*4, | |
881 | IPPROTO_TCP, 0); | |
882 | } | |
0d160211 JF |
883 | break; |
884 | case IPPROTO_UDP: | |
885 | skb->csum_offset = offsetof(struct udphdr, check); | |
e0ce4af9 IC |
886 | |
887 | if (recalculate_partial_csum) { | |
888 | struct udphdr *udph = (struct udphdr *)th; | |
889 | udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
890 | skb->len - iph->ihl*4, | |
891 | IPPROTO_UDP, 0); | |
892 | } | |
0d160211 JF |
893 | break; |
894 | default: | |
895 | if (net_ratelimit()) | |
896 | printk(KERN_ERR "Attempting to checksum a non-" | |
897 | "TCP/UDP packet, dropping a protocol" | |
898 | " %d packet", iph->protocol); | |
899 | goto out; | |
900 | } | |
901 | ||
902 | if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) | |
903 | goto out; | |
904 | ||
905 | err = 0; | |
906 | ||
907 | out: | |
908 | return err; | |
909 | } | |
910 | ||
911 | static int handle_incoming_queue(struct net_device *dev, | |
09f75cd7 | 912 | struct sk_buff_head *rxq) |
0d160211 | 913 | { |
e00f85be | 914 | struct netfront_info *np = netdev_priv(dev); |
915 | struct netfront_stats *stats = this_cpu_ptr(np->stats); | |
0d160211 JF |
916 | int packets_dropped = 0; |
917 | struct sk_buff *skb; | |
918 | ||
919 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
3683243b | 920 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
0d160211 | 921 | |
3683243b | 922 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
0d160211 JF |
923 | |
924 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
925 | skb->protocol = eth_type_trans(skb, dev); | |
926 | ||
e0ce4af9 IC |
927 | if (checksum_setup(dev, skb)) { |
928 | kfree_skb(skb); | |
929 | packets_dropped++; | |
930 | dev->stats.rx_errors++; | |
931 | continue; | |
0d160211 JF |
932 | } |
933 | ||
e00f85be | 934 | u64_stats_update_begin(&stats->syncp); |
935 | stats->rx_packets++; | |
936 | stats->rx_bytes += skb->len; | |
937 | u64_stats_update_end(&stats->syncp); | |
0d160211 JF |
938 | |
939 | /* Pass it up. */ | |
940 | netif_receive_skb(skb); | |
0d160211 JF |
941 | } |
942 | ||
943 | return packets_dropped; | |
944 | } | |
945 | ||
bea3348e | 946 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 947 | { |
bea3348e SH |
948 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
949 | struct net_device *dev = np->netdev; | |
0d160211 JF |
950 | struct sk_buff *skb; |
951 | struct netfront_rx_info rinfo; | |
952 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
953 | struct xen_netif_extra_info *extras = rinfo.extras; | |
954 | RING_IDX i, rp; | |
bea3348e | 955 | int work_done; |
0d160211 JF |
956 | struct sk_buff_head rxq; |
957 | struct sk_buff_head errq; | |
958 | struct sk_buff_head tmpq; | |
959 | unsigned long flags; | |
0d160211 JF |
960 | int err; |
961 | ||
962 | spin_lock(&np->rx_lock); | |
963 | ||
0d160211 JF |
964 | skb_queue_head_init(&rxq); |
965 | skb_queue_head_init(&errq); | |
966 | skb_queue_head_init(&tmpq); | |
967 | ||
0d160211 JF |
968 | rp = np->rx.sring->rsp_prod; |
969 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | |
970 | ||
971 | i = np->rx.rsp_cons; | |
972 | work_done = 0; | |
973 | while ((i != rp) && (work_done < budget)) { | |
974 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | |
975 | memset(extras, 0, sizeof(rinfo.extras)); | |
976 | ||
977 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | |
978 | ||
979 | if (unlikely(err)) { | |
980 | err: | |
981 | while ((skb = __skb_dequeue(&tmpq))) | |
982 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 983 | dev->stats.rx_errors++; |
0d160211 JF |
984 | i = np->rx.rsp_cons; |
985 | continue; | |
986 | } | |
987 | ||
988 | skb = __skb_dequeue(&tmpq); | |
989 | ||
990 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
991 | struct xen_netif_extra_info *gso; | |
992 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
993 | ||
994 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
995 | __skb_queue_head(&tmpq, skb); | |
996 | np->rx.rsp_cons += skb_queue_len(&tmpq); | |
997 | goto err; | |
998 | } | |
999 | } | |
1000 | ||
3683243b IC |
1001 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
1002 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) | |
1003 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; | |
0d160211 | 1004 | |
3683243b IC |
1005 | skb_shinfo(skb)->frags[0].page_offset = rx->offset; |
1006 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); | |
1007 | skb->data_len = rx->status; | |
0d160211 JF |
1008 | |
1009 | i = xennet_fill_frags(np, skb, &tmpq); | |
1010 | ||
1011 | /* | |
d9a58a78 IC |
1012 | * Truesize is the actual allocation size, even if the |
1013 | * allocation is only partially used. | |
1014 | */ | |
1015 | skb->truesize += PAGE_SIZE * skb_shinfo(skb)->nr_frags; | |
0d160211 JF |
1016 | skb->len += skb->data_len; |
1017 | ||
f942dc25 | 1018 | if (rx->flags & XEN_NETRXF_csum_blank) |
0d160211 | 1019 | skb->ip_summed = CHECKSUM_PARTIAL; |
f942dc25 | 1020 | else if (rx->flags & XEN_NETRXF_data_validated) |
0d160211 JF |
1021 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1022 | ||
1023 | __skb_queue_tail(&rxq, skb); | |
1024 | ||
1025 | np->rx.rsp_cons = ++i; | |
1026 | work_done++; | |
1027 | } | |
1028 | ||
56cfe5d0 | 1029 | __skb_queue_purge(&errq); |
0d160211 JF |
1030 | |
1031 | work_done -= handle_incoming_queue(dev, &rxq); | |
1032 | ||
1033 | /* If we get a callback with very few responses, reduce fill target. */ | |
1034 | /* NB. Note exponential increase, linear decrease. */ | |
1035 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > | |
1036 | ((3*np->rx_target) / 4)) && | |
1037 | (--np->rx_target < np->rx_min_target)) | |
1038 | np->rx_target = np->rx_min_target; | |
1039 | ||
1040 | xennet_alloc_rx_buffers(dev); | |
1041 | ||
0d160211 | 1042 | if (work_done < budget) { |
bea3348e SH |
1043 | int more_to_do = 0; |
1044 | ||
0d160211 JF |
1045 | local_irq_save(flags); |
1046 | ||
1047 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | |
1048 | if (!more_to_do) | |
288379f0 | 1049 | __napi_complete(napi); |
0d160211 JF |
1050 | |
1051 | local_irq_restore(flags); | |
1052 | } | |
1053 | ||
1054 | spin_unlock(&np->rx_lock); | |
1055 | ||
bea3348e | 1056 | return work_done; |
0d160211 JF |
1057 | } |
1058 | ||
1059 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
1060 | { | |
1061 | int max = xennet_can_sg(dev) ? 65535 - ETH_HLEN : ETH_DATA_LEN; | |
1062 | ||
1063 | if (mtu > max) | |
1064 | return -EINVAL; | |
1065 | dev->mtu = mtu; | |
1066 | return 0; | |
1067 | } | |
1068 | ||
e00f85be | 1069 | static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, |
1070 | struct rtnl_link_stats64 *tot) | |
1071 | { | |
1072 | struct netfront_info *np = netdev_priv(dev); | |
1073 | int cpu; | |
1074 | ||
1075 | for_each_possible_cpu(cpu) { | |
1076 | struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu); | |
1077 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; | |
1078 | unsigned int start; | |
1079 | ||
1080 | do { | |
1081 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
1082 | ||
1083 | rx_packets = stats->rx_packets; | |
1084 | tx_packets = stats->tx_packets; | |
1085 | rx_bytes = stats->rx_bytes; | |
1086 | tx_bytes = stats->tx_bytes; | |
1087 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); | |
1088 | ||
1089 | tot->rx_packets += rx_packets; | |
1090 | tot->tx_packets += tx_packets; | |
1091 | tot->rx_bytes += rx_bytes; | |
1092 | tot->tx_bytes += tx_bytes; | |
1093 | } | |
1094 | ||
1095 | tot->rx_errors = dev->stats.rx_errors; | |
1096 | tot->tx_dropped = dev->stats.tx_dropped; | |
1097 | ||
1098 | return tot; | |
1099 | } | |
1100 | ||
0d160211 JF |
1101 | static void xennet_release_tx_bufs(struct netfront_info *np) |
1102 | { | |
1103 | struct sk_buff *skb; | |
1104 | int i; | |
1105 | ||
1106 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1107 | /* Skip over entries which are actually freelist references */ | |
1ffb40b8 | 1108 | if (skb_entry_is_link(&np->tx_skbs[i])) |
0d160211 JF |
1109 | continue; |
1110 | ||
1111 | skb = np->tx_skbs[i].skb; | |
1112 | gnttab_end_foreign_access_ref(np->grant_tx_ref[i], | |
1113 | GNTMAP_readonly); | |
1114 | gnttab_release_grant_reference(&np->gref_tx_head, | |
1115 | np->grant_tx_ref[i]); | |
1116 | np->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1117 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | |
1118 | dev_kfree_skb_irq(skb); | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | static void xennet_release_rx_bufs(struct netfront_info *np) | |
1123 | { | |
1124 | struct mmu_update *mmu = np->rx_mmu; | |
1125 | struct multicall_entry *mcl = np->rx_mcl; | |
1126 | struct sk_buff_head free_list; | |
1127 | struct sk_buff *skb; | |
1128 | unsigned long mfn; | |
1129 | int xfer = 0, noxfer = 0, unused = 0; | |
1130 | int id, ref; | |
1131 | ||
1132 | dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n", | |
1133 | __func__); | |
1134 | return; | |
1135 | ||
1136 | skb_queue_head_init(&free_list); | |
1137 | ||
1138 | spin_lock_bh(&np->rx_lock); | |
1139 | ||
1140 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
1141 | ref = np->grant_rx_ref[id]; | |
1142 | if (ref == GRANT_INVALID_REF) { | |
1143 | unused++; | |
1144 | continue; | |
1145 | } | |
1146 | ||
1147 | skb = np->rx_skbs[id]; | |
1148 | mfn = gnttab_end_foreign_transfer_ref(ref); | |
1149 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
1150 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | |
1151 | ||
1152 | if (0 == mfn) { | |
1153 | skb_shinfo(skb)->nr_frags = 0; | |
1154 | dev_kfree_skb(skb); | |
1155 | noxfer++; | |
1156 | continue; | |
1157 | } | |
1158 | ||
1159 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1160 | /* Remap the page. */ | |
01c68026 IC |
1161 | const struct page *page = |
1162 | skb_frag_page(&skb_shinfo(skb)->frags[0]); | |
0d160211 JF |
1163 | unsigned long pfn = page_to_pfn(page); |
1164 | void *vaddr = page_address(page); | |
1165 | ||
1166 | MULTI_update_va_mapping(mcl, (unsigned long)vaddr, | |
1167 | mfn_pte(mfn, PAGE_KERNEL), | |
1168 | 0); | |
1169 | mcl++; | |
1170 | mmu->ptr = ((u64)mfn << PAGE_SHIFT) | |
1171 | | MMU_MACHPHYS_UPDATE; | |
1172 | mmu->val = pfn; | |
1173 | mmu++; | |
1174 | ||
1175 | set_phys_to_machine(pfn, mfn); | |
1176 | } | |
1177 | __skb_queue_tail(&free_list, skb); | |
1178 | xfer++; | |
1179 | } | |
1180 | ||
1181 | dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n", | |
1182 | __func__, xfer, noxfer, unused); | |
1183 | ||
1184 | if (xfer) { | |
1185 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
1186 | /* Do all the remapping work and M2P updates. */ | |
1187 | MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu, | |
79ea13ce | 1188 | NULL, DOMID_SELF); |
0d160211 JF |
1189 | mcl++; |
1190 | HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl); | |
1191 | } | |
1192 | } | |
1193 | ||
56cfe5d0 | 1194 | __skb_queue_purge(&free_list); |
0d160211 JF |
1195 | |
1196 | spin_unlock_bh(&np->rx_lock); | |
1197 | } | |
1198 | ||
1199 | static void xennet_uninit(struct net_device *dev) | |
1200 | { | |
1201 | struct netfront_info *np = netdev_priv(dev); | |
1202 | xennet_release_tx_bufs(np); | |
1203 | xennet_release_rx_bufs(np); | |
1204 | gnttab_free_grant_references(np->gref_tx_head); | |
1205 | gnttab_free_grant_references(np->gref_rx_head); | |
1206 | } | |
1207 | ||
c8f44aff MM |
1208 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
1209 | netdev_features_t features) | |
8f7b01a1 ED |
1210 | { |
1211 | struct netfront_info *np = netdev_priv(dev); | |
1212 | int val; | |
1213 | ||
1214 | if (features & NETIF_F_SG) { | |
1215 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | |
1216 | "%d", &val) < 0) | |
1217 | val = 0; | |
1218 | ||
1219 | if (!val) | |
1220 | features &= ~NETIF_F_SG; | |
1221 | } | |
1222 | ||
1223 | if (features & NETIF_F_TSO) { | |
1224 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1225 | "feature-gso-tcpv4", "%d", &val) < 0) | |
1226 | val = 0; | |
1227 | ||
1228 | if (!val) | |
1229 | features &= ~NETIF_F_TSO; | |
1230 | } | |
1231 | ||
1232 | return features; | |
1233 | } | |
1234 | ||
c8f44aff MM |
1235 | static int xennet_set_features(struct net_device *dev, |
1236 | netdev_features_t features) | |
8f7b01a1 ED |
1237 | { |
1238 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { | |
1239 | netdev_info(dev, "Reducing MTU because no SG offload"); | |
1240 | dev->mtu = ETH_DATA_LEN; | |
1241 | } | |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
cf66f9d4 KRW |
1246 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
1247 | { | |
1248 | struct net_device *dev = dev_id; | |
1249 | struct netfront_info *np = netdev_priv(dev); | |
1250 | unsigned long flags; | |
1251 | ||
1252 | spin_lock_irqsave(&np->tx_lock, flags); | |
1253 | ||
1254 | if (likely(netif_carrier_ok(dev))) { | |
1255 | xennet_tx_buf_gc(dev); | |
1256 | /* Under tx_lock: protects access to rx shared-ring indexes. */ | |
1257 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
1258 | napi_schedule(&np->napi); | |
1259 | } | |
1260 | ||
1261 | spin_unlock_irqrestore(&np->tx_lock, flags); | |
1262 | ||
1263 | return IRQ_HANDLED; | |
1264 | } | |
1265 | ||
1266 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1267 | static void xennet_poll_controller(struct net_device *dev) | |
1268 | { | |
1269 | xennet_interrupt(0, dev); | |
1270 | } | |
1271 | #endif | |
1272 | ||
0a0b9d2e SH |
1273 | static const struct net_device_ops xennet_netdev_ops = { |
1274 | .ndo_open = xennet_open, | |
1275 | .ndo_uninit = xennet_uninit, | |
1276 | .ndo_stop = xennet_close, | |
1277 | .ndo_start_xmit = xennet_start_xmit, | |
1278 | .ndo_change_mtu = xennet_change_mtu, | |
e00f85be | 1279 | .ndo_get_stats64 = xennet_get_stats64, |
0a0b9d2e SH |
1280 | .ndo_set_mac_address = eth_mac_addr, |
1281 | .ndo_validate_addr = eth_validate_addr, | |
fb507934 MM |
1282 | .ndo_fix_features = xennet_fix_features, |
1283 | .ndo_set_features = xennet_set_features, | |
cf66f9d4 KRW |
1284 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1285 | .ndo_poll_controller = xennet_poll_controller, | |
1286 | #endif | |
0a0b9d2e SH |
1287 | }; |
1288 | ||
8e0e46bb | 1289 | static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
0d160211 JF |
1290 | { |
1291 | int i, err; | |
1292 | struct net_device *netdev; | |
1293 | struct netfront_info *np; | |
1294 | ||
1295 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | |
41de8d4c | 1296 | if (!netdev) |
0d160211 | 1297 | return ERR_PTR(-ENOMEM); |
0d160211 JF |
1298 | |
1299 | np = netdev_priv(netdev); | |
1300 | np->xbdev = dev; | |
1301 | ||
1302 | spin_lock_init(&np->tx_lock); | |
1303 | spin_lock_init(&np->rx_lock); | |
1304 | ||
1305 | skb_queue_head_init(&np->rx_batch); | |
1306 | np->rx_target = RX_DFL_MIN_TARGET; | |
1307 | np->rx_min_target = RX_DFL_MIN_TARGET; | |
1308 | np->rx_max_target = RX_MAX_TARGET; | |
1309 | ||
1310 | init_timer(&np->rx_refill_timer); | |
1311 | np->rx_refill_timer.data = (unsigned long)netdev; | |
1312 | np->rx_refill_timer.function = rx_refill_timeout; | |
1313 | ||
e00f85be | 1314 | err = -ENOMEM; |
1315 | np->stats = alloc_percpu(struct netfront_stats); | |
1316 | if (np->stats == NULL) | |
1317 | goto exit; | |
1318 | ||
0d160211 JF |
1319 | /* Initialise tx_skbs as a free chain containing every entry. */ |
1320 | np->tx_skb_freelist = 0; | |
1321 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1ffb40b8 | 1322 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
0d160211 JF |
1323 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1324 | } | |
1325 | ||
1326 | /* Clear out rx_skbs */ | |
1327 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1328 | np->rx_skbs[i] = NULL; | |
1329 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1330 | } | |
1331 | ||
1332 | /* A grant for every tx ring slot */ | |
1333 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | |
1334 | &np->gref_tx_head) < 0) { | |
1335 | printk(KERN_ALERT "#### netfront can't alloc tx grant refs\n"); | |
1336 | err = -ENOMEM; | |
e00f85be | 1337 | goto exit_free_stats; |
0d160211 JF |
1338 | } |
1339 | /* A grant for every rx ring slot */ | |
1340 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | |
1341 | &np->gref_rx_head) < 0) { | |
1342 | printk(KERN_ALERT "#### netfront can't alloc rx grant refs\n"); | |
1343 | err = -ENOMEM; | |
1344 | goto exit_free_tx; | |
1345 | } | |
1346 | ||
0a0b9d2e SH |
1347 | netdev->netdev_ops = &xennet_netdev_ops; |
1348 | ||
bea3348e | 1349 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
fb507934 MM |
1350 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
1351 | NETIF_F_GSO_ROBUST; | |
1352 | netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO; | |
0d160211 | 1353 | |
fc3e5941 IC |
1354 | /* |
1355 | * Assume that all hw features are available for now. This set | |
1356 | * will be adjusted by the call to netdev_update_features() in | |
1357 | * xennet_connect() which is the earliest point where we can | |
1358 | * negotiate with the backend regarding supported features. | |
1359 | */ | |
1360 | netdev->features |= netdev->hw_features; | |
1361 | ||
0d160211 | 1362 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); |
0d160211 JF |
1363 | SET_NETDEV_DEV(netdev, &dev->dev); |
1364 | ||
1365 | np->netdev = netdev; | |
1366 | ||
1367 | netif_carrier_off(netdev); | |
1368 | ||
1369 | return netdev; | |
1370 | ||
1371 | exit_free_tx: | |
1372 | gnttab_free_grant_references(np->gref_tx_head); | |
e00f85be | 1373 | exit_free_stats: |
1374 | free_percpu(np->stats); | |
0d160211 JF |
1375 | exit: |
1376 | free_netdev(netdev); | |
1377 | return ERR_PTR(err); | |
1378 | } | |
1379 | ||
1380 | /** | |
1381 | * Entry point to this code when a new device is created. Allocate the basic | |
1382 | * structures and the ring buffers for communication with the backend, and | |
1383 | * inform the backend of the appropriate details for those. | |
1384 | */ | |
8e0e46bb | 1385 | static int netfront_probe(struct xenbus_device *dev, |
1dd06ae8 | 1386 | const struct xenbus_device_id *id) |
0d160211 JF |
1387 | { |
1388 | int err; | |
1389 | struct net_device *netdev; | |
1390 | struct netfront_info *info; | |
1391 | ||
1392 | netdev = xennet_create_dev(dev); | |
1393 | if (IS_ERR(netdev)) { | |
1394 | err = PTR_ERR(netdev); | |
1395 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1396 | return err; | |
1397 | } | |
1398 | ||
1399 | info = netdev_priv(netdev); | |
1b713e00 | 1400 | dev_set_drvdata(&dev->dev, info); |
0d160211 JF |
1401 | |
1402 | err = register_netdev(info->netdev); | |
1403 | if (err) { | |
1404 | printk(KERN_WARNING "%s: register_netdev err=%d\n", | |
1405 | __func__, err); | |
1406 | goto fail; | |
1407 | } | |
1408 | ||
1409 | err = xennet_sysfs_addif(info->netdev); | |
1410 | if (err) { | |
1411 | unregister_netdev(info->netdev); | |
1412 | printk(KERN_WARNING "%s: add sysfs failed err=%d\n", | |
1413 | __func__, err); | |
1414 | goto fail; | |
1415 | } | |
1416 | ||
1417 | return 0; | |
1418 | ||
1419 | fail: | |
1420 | free_netdev(netdev); | |
1b713e00 | 1421 | dev_set_drvdata(&dev->dev, NULL); |
0d160211 JF |
1422 | return err; |
1423 | } | |
1424 | ||
1425 | static void xennet_end_access(int ref, void *page) | |
1426 | { | |
1427 | /* This frees the page as a side-effect */ | |
1428 | if (ref != GRANT_INVALID_REF) | |
1429 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1430 | } | |
1431 | ||
1432 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1433 | { | |
1434 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | |
1435 | spin_lock_bh(&info->rx_lock); | |
1436 | spin_lock_irq(&info->tx_lock); | |
1437 | netif_carrier_off(info->netdev); | |
1438 | spin_unlock_irq(&info->tx_lock); | |
1439 | spin_unlock_bh(&info->rx_lock); | |
1440 | ||
1441 | if (info->netdev->irq) | |
1442 | unbind_from_irqhandler(info->netdev->irq, info->netdev); | |
1443 | info->evtchn = info->netdev->irq = 0; | |
1444 | ||
1445 | /* End access and free the pages */ | |
1446 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | |
1447 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | |
1448 | ||
1449 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1450 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1451 | info->tx.sring = NULL; | |
1452 | info->rx.sring = NULL; | |
1453 | } | |
1454 | ||
1455 | /** | |
1456 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1457 | * driver restart. We tear down our netif structure and recreate it, but | |
1458 | * leave the device-layer structures intact so that this is transparent to the | |
1459 | * rest of the kernel. | |
1460 | */ | |
1461 | static int netfront_resume(struct xenbus_device *dev) | |
1462 | { | |
1b713e00 | 1463 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1464 | |
1465 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1466 | ||
1467 | xennet_disconnect_backend(info); | |
1468 | return 0; | |
1469 | } | |
1470 | ||
1471 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1472 | { | |
1473 | char *s, *e, *macstr; | |
1474 | int i; | |
1475 | ||
1476 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1477 | if (IS_ERR(macstr)) | |
1478 | return PTR_ERR(macstr); | |
1479 | ||
1480 | for (i = 0; i < ETH_ALEN; i++) { | |
1481 | mac[i] = simple_strtoul(s, &e, 16); | |
1482 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1483 | kfree(macstr); | |
1484 | return -ENOENT; | |
1485 | } | |
1486 | s = e+1; | |
1487 | } | |
1488 | ||
1489 | kfree(macstr); | |
1490 | return 0; | |
1491 | } | |
1492 | ||
0d160211 JF |
1493 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) |
1494 | { | |
1495 | struct xen_netif_tx_sring *txs; | |
1496 | struct xen_netif_rx_sring *rxs; | |
1497 | int err; | |
1498 | struct net_device *netdev = info->netdev; | |
1499 | ||
1500 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1501 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1502 | info->rx.sring = NULL; | |
1503 | info->tx.sring = NULL; | |
1504 | netdev->irq = 0; | |
1505 | ||
1506 | err = xen_net_read_mac(dev, netdev->dev_addr); | |
1507 | if (err) { | |
1508 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1509 | goto fail; | |
1510 | } | |
1511 | ||
a144ff09 | 1512 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1513 | if (!txs) { |
1514 | err = -ENOMEM; | |
1515 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1516 | goto fail; | |
1517 | } | |
1518 | SHARED_RING_INIT(txs); | |
1519 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | |
1520 | ||
1521 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | |
1522 | if (err < 0) { | |
1523 | free_page((unsigned long)txs); | |
1524 | goto fail; | |
1525 | } | |
1526 | ||
1527 | info->tx_ring_ref = err; | |
a144ff09 | 1528 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1529 | if (!rxs) { |
1530 | err = -ENOMEM; | |
1531 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1532 | goto fail; | |
1533 | } | |
1534 | SHARED_RING_INIT(rxs); | |
1535 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | |
1536 | ||
1537 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | |
1538 | if (err < 0) { | |
1539 | free_page((unsigned long)rxs); | |
1540 | goto fail; | |
1541 | } | |
1542 | info->rx_ring_ref = err; | |
1543 | ||
1544 | err = xenbus_alloc_evtchn(dev, &info->evtchn); | |
1545 | if (err) | |
1546 | goto fail; | |
1547 | ||
1548 | err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt, | |
ab392d2d | 1549 | 0, netdev->name, netdev); |
0d160211 JF |
1550 | if (err < 0) |
1551 | goto fail; | |
1552 | netdev->irq = err; | |
1553 | return 0; | |
1554 | ||
1555 | fail: | |
1556 | return err; | |
1557 | } | |
1558 | ||
1559 | /* Common code used when first setting up, and when resuming. */ | |
f502bf2b | 1560 | static int talk_to_netback(struct xenbus_device *dev, |
0d160211 JF |
1561 | struct netfront_info *info) |
1562 | { | |
1563 | const char *message; | |
1564 | struct xenbus_transaction xbt; | |
1565 | int err; | |
1566 | ||
1567 | /* Create shared ring, alloc event channel. */ | |
1568 | err = setup_netfront(dev, info); | |
1569 | if (err) | |
1570 | goto out; | |
1571 | ||
1572 | again: | |
1573 | err = xenbus_transaction_start(&xbt); | |
1574 | if (err) { | |
1575 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1576 | goto destroy_ring; | |
1577 | } | |
1578 | ||
1579 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | |
1580 | info->tx_ring_ref); | |
1581 | if (err) { | |
1582 | message = "writing tx ring-ref"; | |
1583 | goto abort_transaction; | |
1584 | } | |
1585 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | |
1586 | info->rx_ring_ref); | |
1587 | if (err) { | |
1588 | message = "writing rx ring-ref"; | |
1589 | goto abort_transaction; | |
1590 | } | |
1591 | err = xenbus_printf(xbt, dev->nodename, | |
1592 | "event-channel", "%u", info->evtchn); | |
1593 | if (err) { | |
1594 | message = "writing event-channel"; | |
1595 | goto abort_transaction; | |
1596 | } | |
1597 | ||
1598 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | |
1599 | 1); | |
1600 | if (err) { | |
1601 | message = "writing request-rx-copy"; | |
1602 | goto abort_transaction; | |
1603 | } | |
1604 | ||
1605 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1606 | if (err) { | |
1607 | message = "writing feature-rx-notify"; | |
1608 | goto abort_transaction; | |
1609 | } | |
1610 | ||
1611 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1612 | if (err) { | |
1613 | message = "writing feature-sg"; | |
1614 | goto abort_transaction; | |
1615 | } | |
1616 | ||
1617 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1618 | if (err) { | |
1619 | message = "writing feature-gso-tcpv4"; | |
1620 | goto abort_transaction; | |
1621 | } | |
1622 | ||
1623 | err = xenbus_transaction_end(xbt, 0); | |
1624 | if (err) { | |
1625 | if (err == -EAGAIN) | |
1626 | goto again; | |
1627 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1628 | goto destroy_ring; | |
1629 | } | |
1630 | ||
1631 | return 0; | |
1632 | ||
1633 | abort_transaction: | |
1634 | xenbus_transaction_end(xbt, 1); | |
1635 | xenbus_dev_fatal(dev, err, "%s", message); | |
1636 | destroy_ring: | |
1637 | xennet_disconnect_backend(info); | |
1638 | out: | |
1639 | return err; | |
1640 | } | |
1641 | ||
0d160211 JF |
1642 | static int xennet_connect(struct net_device *dev) |
1643 | { | |
1644 | struct netfront_info *np = netdev_priv(dev); | |
1645 | int i, requeue_idx, err; | |
1646 | struct sk_buff *skb; | |
1647 | grant_ref_t ref; | |
1648 | struct xen_netif_rx_request *req; | |
1649 | unsigned int feature_rx_copy; | |
1650 | ||
1651 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1652 | "feature-rx-copy", "%u", &feature_rx_copy); | |
1653 | if (err != 1) | |
1654 | feature_rx_copy = 0; | |
1655 | ||
1656 | if (!feature_rx_copy) { | |
1657 | dev_info(&dev->dev, | |
898eb71c | 1658 | "backend does not support copying receive path\n"); |
0d160211 JF |
1659 | return -ENODEV; |
1660 | } | |
1661 | ||
f502bf2b | 1662 | err = talk_to_netback(np->xbdev, np); |
0d160211 JF |
1663 | if (err) |
1664 | return err; | |
1665 | ||
1ba37c51 | 1666 | rtnl_lock(); |
fb507934 | 1667 | netdev_update_features(dev); |
1ba37c51 | 1668 | rtnl_unlock(); |
0d160211 JF |
1669 | |
1670 | spin_lock_bh(&np->rx_lock); | |
1671 | spin_lock_irq(&np->tx_lock); | |
1672 | ||
1673 | /* Step 1: Discard all pending TX packet fragments. */ | |
1674 | xennet_release_tx_bufs(np); | |
1675 | ||
1676 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | |
1677 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | |
01c68026 IC |
1678 | skb_frag_t *frag; |
1679 | const struct page *page; | |
0d160211 JF |
1680 | if (!np->rx_skbs[i]) |
1681 | continue; | |
1682 | ||
1683 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | |
1684 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | |
1685 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | |
1686 | ||
01c68026 IC |
1687 | frag = &skb_shinfo(skb)->frags[0]; |
1688 | page = skb_frag_page(frag); | |
0d160211 JF |
1689 | gnttab_grant_foreign_access_ref( |
1690 | ref, np->xbdev->otherend_id, | |
01c68026 | 1691 | pfn_to_mfn(page_to_pfn(page)), |
0d160211 JF |
1692 | 0); |
1693 | req->gref = ref; | |
1694 | req->id = requeue_idx; | |
1695 | ||
1696 | requeue_idx++; | |
1697 | } | |
1698 | ||
1699 | np->rx.req_prod_pvt = requeue_idx; | |
1700 | ||
1701 | /* | |
1702 | * Step 3: All public and private state should now be sane. Get | |
1703 | * ready to start sending and receiving packets and give the driver | |
1704 | * domain a kick because we've probably just requeued some | |
1705 | * packets. | |
1706 | */ | |
1707 | netif_carrier_on(np->netdev); | |
1708 | notify_remote_via_irq(np->netdev->irq); | |
1709 | xennet_tx_buf_gc(dev); | |
1710 | xennet_alloc_rx_buffers(dev); | |
1711 | ||
1712 | spin_unlock_irq(&np->tx_lock); | |
1713 | spin_unlock_bh(&np->rx_lock); | |
1714 | ||
1715 | return 0; | |
1716 | } | |
1717 | ||
1718 | /** | |
1719 | * Callback received when the backend's state changes. | |
1720 | */ | |
f502bf2b | 1721 | static void netback_changed(struct xenbus_device *dev, |
0d160211 JF |
1722 | enum xenbus_state backend_state) |
1723 | { | |
1b713e00 | 1724 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1725 | struct net_device *netdev = np->netdev; |
1726 | ||
1727 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
1728 | ||
1729 | switch (backend_state) { | |
1730 | case XenbusStateInitialising: | |
1731 | case XenbusStateInitialised: | |
b78c9512 NI |
1732 | case XenbusStateReconfiguring: |
1733 | case XenbusStateReconfigured: | |
0d160211 JF |
1734 | case XenbusStateUnknown: |
1735 | case XenbusStateClosed: | |
1736 | break; | |
1737 | ||
1738 | case XenbusStateInitWait: | |
1739 | if (dev->state != XenbusStateInitialising) | |
1740 | break; | |
1741 | if (xennet_connect(netdev) != 0) | |
1742 | break; | |
1743 | xenbus_switch_state(dev, XenbusStateConnected); | |
08e34eb1 LE |
1744 | break; |
1745 | ||
1746 | case XenbusStateConnected: | |
ee89bab1 | 1747 | netdev_notify_peers(netdev); |
0d160211 JF |
1748 | break; |
1749 | ||
1750 | case XenbusStateClosing: | |
1751 | xenbus_frontend_closed(dev); | |
1752 | break; | |
1753 | } | |
1754 | } | |
1755 | ||
e0ce4af9 IC |
1756 | static const struct xennet_stat { |
1757 | char name[ETH_GSTRING_LEN]; | |
1758 | u16 offset; | |
1759 | } xennet_stats[] = { | |
1760 | { | |
1761 | "rx_gso_checksum_fixup", | |
1762 | offsetof(struct netfront_info, rx_gso_checksum_fixup) | |
1763 | }, | |
1764 | }; | |
1765 | ||
1766 | static int xennet_get_sset_count(struct net_device *dev, int string_set) | |
1767 | { | |
1768 | switch (string_set) { | |
1769 | case ETH_SS_STATS: | |
1770 | return ARRAY_SIZE(xennet_stats); | |
1771 | default: | |
1772 | return -EINVAL; | |
1773 | } | |
1774 | } | |
1775 | ||
1776 | static void xennet_get_ethtool_stats(struct net_device *dev, | |
1777 | struct ethtool_stats *stats, u64 * data) | |
1778 | { | |
1779 | void *np = netdev_priv(dev); | |
1780 | int i; | |
1781 | ||
1782 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
48f26d51 | 1783 | data[i] = *(unsigned long *)(np + xennet_stats[i].offset); |
e0ce4af9 IC |
1784 | } |
1785 | ||
1786 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
1787 | { | |
1788 | int i; | |
1789 | ||
1790 | switch (stringset) { | |
1791 | case ETH_SS_STATS: | |
1792 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
1793 | memcpy(data + i * ETH_GSTRING_LEN, | |
1794 | xennet_stats[i].name, ETH_GSTRING_LEN); | |
1795 | break; | |
1796 | } | |
1797 | } | |
1798 | ||
0fc0b732 | 1799 | static const struct ethtool_ops xennet_ethtool_ops = |
0d160211 | 1800 | { |
0d160211 | 1801 | .get_link = ethtool_op_get_link, |
e0ce4af9 IC |
1802 | |
1803 | .get_sset_count = xennet_get_sset_count, | |
1804 | .get_ethtool_stats = xennet_get_ethtool_stats, | |
1805 | .get_strings = xennet_get_strings, | |
0d160211 JF |
1806 | }; |
1807 | ||
1808 | #ifdef CONFIG_SYSFS | |
1809 | static ssize_t show_rxbuf_min(struct device *dev, | |
1810 | struct device_attribute *attr, char *buf) | |
1811 | { | |
1812 | struct net_device *netdev = to_net_dev(dev); | |
1813 | struct netfront_info *info = netdev_priv(netdev); | |
1814 | ||
1815 | return sprintf(buf, "%u\n", info->rx_min_target); | |
1816 | } | |
1817 | ||
1818 | static ssize_t store_rxbuf_min(struct device *dev, | |
1819 | struct device_attribute *attr, | |
1820 | const char *buf, size_t len) | |
1821 | { | |
1822 | struct net_device *netdev = to_net_dev(dev); | |
1823 | struct netfront_info *np = netdev_priv(netdev); | |
1824 | char *endp; | |
1825 | unsigned long target; | |
1826 | ||
1827 | if (!capable(CAP_NET_ADMIN)) | |
1828 | return -EPERM; | |
1829 | ||
1830 | target = simple_strtoul(buf, &endp, 0); | |
1831 | if (endp == buf) | |
1832 | return -EBADMSG; | |
1833 | ||
1834 | if (target < RX_MIN_TARGET) | |
1835 | target = RX_MIN_TARGET; | |
1836 | if (target > RX_MAX_TARGET) | |
1837 | target = RX_MAX_TARGET; | |
1838 | ||
1839 | spin_lock_bh(&np->rx_lock); | |
1840 | if (target > np->rx_max_target) | |
1841 | np->rx_max_target = target; | |
1842 | np->rx_min_target = target; | |
1843 | if (target > np->rx_target) | |
1844 | np->rx_target = target; | |
1845 | ||
1846 | xennet_alloc_rx_buffers(netdev); | |
1847 | ||
1848 | spin_unlock_bh(&np->rx_lock); | |
1849 | return len; | |
1850 | } | |
1851 | ||
1852 | static ssize_t show_rxbuf_max(struct device *dev, | |
1853 | struct device_attribute *attr, char *buf) | |
1854 | { | |
1855 | struct net_device *netdev = to_net_dev(dev); | |
1856 | struct netfront_info *info = netdev_priv(netdev); | |
1857 | ||
1858 | return sprintf(buf, "%u\n", info->rx_max_target); | |
1859 | } | |
1860 | ||
1861 | static ssize_t store_rxbuf_max(struct device *dev, | |
1862 | struct device_attribute *attr, | |
1863 | const char *buf, size_t len) | |
1864 | { | |
1865 | struct net_device *netdev = to_net_dev(dev); | |
1866 | struct netfront_info *np = netdev_priv(netdev); | |
1867 | char *endp; | |
1868 | unsigned long target; | |
1869 | ||
1870 | if (!capable(CAP_NET_ADMIN)) | |
1871 | return -EPERM; | |
1872 | ||
1873 | target = simple_strtoul(buf, &endp, 0); | |
1874 | if (endp == buf) | |
1875 | return -EBADMSG; | |
1876 | ||
1877 | if (target < RX_MIN_TARGET) | |
1878 | target = RX_MIN_TARGET; | |
1879 | if (target > RX_MAX_TARGET) | |
1880 | target = RX_MAX_TARGET; | |
1881 | ||
1882 | spin_lock_bh(&np->rx_lock); | |
1883 | if (target < np->rx_min_target) | |
1884 | np->rx_min_target = target; | |
1885 | np->rx_max_target = target; | |
1886 | if (target < np->rx_target) | |
1887 | np->rx_target = target; | |
1888 | ||
1889 | xennet_alloc_rx_buffers(netdev); | |
1890 | ||
1891 | spin_unlock_bh(&np->rx_lock); | |
1892 | return len; | |
1893 | } | |
1894 | ||
1895 | static ssize_t show_rxbuf_cur(struct device *dev, | |
1896 | struct device_attribute *attr, char *buf) | |
1897 | { | |
1898 | struct net_device *netdev = to_net_dev(dev); | |
1899 | struct netfront_info *info = netdev_priv(netdev); | |
1900 | ||
1901 | return sprintf(buf, "%u\n", info->rx_target); | |
1902 | } | |
1903 | ||
1904 | static struct device_attribute xennet_attrs[] = { | |
1905 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | |
1906 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | |
1907 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | |
1908 | }; | |
1909 | ||
1910 | static int xennet_sysfs_addif(struct net_device *netdev) | |
1911 | { | |
1912 | int i; | |
1913 | int err; | |
1914 | ||
1915 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | |
1916 | err = device_create_file(&netdev->dev, | |
1917 | &xennet_attrs[i]); | |
1918 | if (err) | |
1919 | goto fail; | |
1920 | } | |
1921 | return 0; | |
1922 | ||
1923 | fail: | |
1924 | while (--i >= 0) | |
1925 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1926 | return err; | |
1927 | } | |
1928 | ||
1929 | static void xennet_sysfs_delif(struct net_device *netdev) | |
1930 | { | |
1931 | int i; | |
1932 | ||
1933 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | |
1934 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
1935 | } | |
1936 | ||
1937 | #endif /* CONFIG_SYSFS */ | |
1938 | ||
73db144b | 1939 | static const struct xenbus_device_id netfront_ids[] = { |
0d160211 JF |
1940 | { "vif" }, |
1941 | { "" } | |
1942 | }; | |
1943 | ||
1944 | ||
8e0e46bb | 1945 | static int xennet_remove(struct xenbus_device *dev) |
0d160211 | 1946 | { |
1b713e00 | 1947 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1948 | |
1949 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1950 | ||
0d160211 JF |
1951 | xennet_disconnect_backend(info); |
1952 | ||
0d160211 JF |
1953 | xennet_sysfs_delif(info->netdev); |
1954 | ||
6bc96d04 IC |
1955 | unregister_netdev(info->netdev); |
1956 | ||
1957 | del_timer_sync(&info->rx_refill_timer); | |
1958 | ||
e00f85be | 1959 | free_percpu(info->stats); |
1960 | ||
0d160211 JF |
1961 | free_netdev(info->netdev); |
1962 | ||
1963 | return 0; | |
1964 | } | |
1965 | ||
73db144b | 1966 | static DEFINE_XENBUS_DRIVER(netfront, , |
0d160211 | 1967 | .probe = netfront_probe, |
8e0e46bb | 1968 | .remove = xennet_remove, |
0d160211 | 1969 | .resume = netfront_resume, |
f502bf2b | 1970 | .otherend_changed = netback_changed, |
73db144b | 1971 | ); |
0d160211 JF |
1972 | |
1973 | static int __init netif_init(void) | |
1974 | { | |
6e833587 | 1975 | if (!xen_domain()) |
0d160211 JF |
1976 | return -ENODEV; |
1977 | ||
e95ae5a4 | 1978 | if (xen_hvm_domain() && !xen_platform_pci_unplug) |
b9136d20 IM |
1979 | return -ENODEV; |
1980 | ||
0d160211 JF |
1981 | printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n"); |
1982 | ||
ffb78a26 | 1983 | return xenbus_register_frontend(&netfront_driver); |
0d160211 JF |
1984 | } |
1985 | module_init(netif_init); | |
1986 | ||
1987 | ||
1988 | static void __exit netif_exit(void) | |
1989 | { | |
ffb78a26 | 1990 | xenbus_unregister_driver(&netfront_driver); |
0d160211 JF |
1991 | } |
1992 | module_exit(netif_exit); | |
1993 | ||
1994 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
1995 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 1996 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 1997 | MODULE_ALIAS("xennet"); |