Commit | Line | Data |
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f942dc25 IC |
1 | /* |
2 | * Back-end of the driver for virtual network devices. This portion of the | |
3 | * driver exports a 'unified' network-device interface that can be accessed | |
4 | * by any operating system that implements a compatible front end. A | |
5 | * reference front-end implementation can be found in: | |
6 | * drivers/net/xen-netfront.c | |
7 | * | |
8 | * Copyright (c) 2002-2005, K A Fraser | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License version 2 | |
12 | * as published by the Free Software Foundation; or, when distributed | |
13 | * separately from the Linux kernel or incorporated into other | |
14 | * software packages, subject to the following license: | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
17 | * of this source file (the "Software"), to deal in the Software without | |
18 | * restriction, including without limitation the rights to use, copy, modify, | |
19 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
20 | * and to permit persons to whom the Software is furnished to do so, subject to | |
21 | * the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice shall be included in | |
24 | * all copies or substantial portions of the Software. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
29 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
30 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
31 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
32 | * IN THE SOFTWARE. | |
33 | */ | |
34 | ||
35 | #include "common.h" | |
36 | ||
37 | #include <linux/kthread.h> | |
38 | #include <linux/if_vlan.h> | |
39 | #include <linux/udp.h> | |
e3377f36 | 40 | #include <linux/highmem.h> |
f942dc25 IC |
41 | |
42 | #include <net/tcp.h> | |
43 | ||
ca981633 | 44 | #include <xen/xen.h> |
f942dc25 IC |
45 | #include <xen/events.h> |
46 | #include <xen/interface/memory.h> | |
a9fd60e2 | 47 | #include <xen/page.h> |
f942dc25 IC |
48 | |
49 | #include <asm/xen/hypercall.h> | |
f942dc25 | 50 | |
e1f00a69 WL |
51 | /* Provide an option to disable split event channels at load time as |
52 | * event channels are limited resource. Split event channels are | |
53 | * enabled by default. | |
54 | */ | |
c489dbb1 | 55 | bool separate_tx_rx_irq = true; |
e1f00a69 WL |
56 | module_param(separate_tx_rx_irq, bool, 0644); |
57 | ||
f48da8b1 DV |
58 | /* The time that packets can stay on the guest Rx internal queue |
59 | * before they are dropped. | |
09350788 ZK |
60 | */ |
61 | unsigned int rx_drain_timeout_msecs = 10000; | |
62 | module_param(rx_drain_timeout_msecs, uint, 0444); | |
09350788 | 63 | |
ecf08d2d DV |
64 | /* The length of time before the frontend is considered unresponsive |
65 | * because it isn't providing Rx slots. | |
66 | */ | |
26c0e102 | 67 | unsigned int rx_stall_timeout_msecs = 60000; |
ecf08d2d | 68 | module_param(rx_stall_timeout_msecs, uint, 0444); |
ecf08d2d | 69 | |
8d3d53b3 AB |
70 | unsigned int xenvif_max_queues; |
71 | module_param_named(max_queues, xenvif_max_queues, uint, 0644); | |
72 | MODULE_PARM_DESC(max_queues, | |
73 | "Maximum number of queues per virtual interface"); | |
74 | ||
2810e5b9 WL |
75 | /* |
76 | * This is the maximum slots a skb can have. If a guest sends a skb | |
77 | * which exceeds this limit it is considered malicious. | |
78 | */ | |
37641494 WL |
79 | #define FATAL_SKB_SLOTS_DEFAULT 20 |
80 | static unsigned int fatal_skb_slots = FATAL_SKB_SLOTS_DEFAULT; | |
81 | module_param(fatal_skb_slots, uint, 0444); | |
82 | ||
7e5d7753 MC |
83 | /* The amount to copy out of the first guest Tx slot into the skb's |
84 | * linear area. If the first slot has more data, it will be mapped | |
85 | * and put into the first frag. | |
86 | * | |
87 | * This is sized to avoid pulling headers from the frags for most | |
88 | * TCP/IP packets. | |
89 | */ | |
90 | #define XEN_NETBACK_TX_COPY_LEN 128 | |
91 | ||
40d8abde PD |
92 | /* This is the maximum number of flows in the hash cache. */ |
93 | #define XENVIF_HASH_CACHE_SIZE_DEFAULT 64 | |
94 | unsigned int xenvif_hash_cache_size = XENVIF_HASH_CACHE_SIZE_DEFAULT; | |
95 | module_param_named(hash_cache_size, xenvif_hash_cache_size, uint, 0644); | |
96 | MODULE_PARM_DESC(hash_cache_size, "Number of flows in the hash cache"); | |
7e5d7753 | 97 | |
e9ce7cb6 | 98 | static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx, |
7376419a WL |
99 | u8 status); |
100 | ||
e9ce7cb6 | 101 | static void make_tx_response(struct xenvif_queue *queue, |
f942dc25 | 102 | struct xen_netif_tx_request *txp, |
562abd39 | 103 | unsigned int extra_count, |
f942dc25 | 104 | s8 st); |
c8a4d299 | 105 | static void push_tx_responses(struct xenvif_queue *queue); |
b3f980bd | 106 | |
e9ce7cb6 | 107 | static inline int tx_work_todo(struct xenvif_queue *queue); |
b3f980bd | 108 | |
e9ce7cb6 | 109 | static struct xen_netif_rx_response *make_rx_response(struct xenvif_queue *queue, |
f942dc25 IC |
110 | u16 id, |
111 | s8 st, | |
112 | u16 offset, | |
113 | u16 size, | |
114 | u16 flags); | |
115 | ||
e9ce7cb6 | 116 | static inline unsigned long idx_to_pfn(struct xenvif_queue *queue, |
ea066ad1 | 117 | u16 idx) |
f942dc25 | 118 | { |
e9ce7cb6 | 119 | return page_to_pfn(queue->mmap_pages[idx]); |
f942dc25 IC |
120 | } |
121 | ||
e9ce7cb6 | 122 | static inline unsigned long idx_to_kaddr(struct xenvif_queue *queue, |
ea066ad1 | 123 | u16 idx) |
f942dc25 | 124 | { |
e9ce7cb6 | 125 | return (unsigned long)pfn_to_kaddr(idx_to_pfn(queue, idx)); |
f942dc25 IC |
126 | } |
127 | ||
7aceb47a ZK |
128 | #define callback_param(vif, pending_idx) \ |
129 | (vif->pending_tx_info[pending_idx].callback_struct) | |
130 | ||
f53c3fe8 ZK |
131 | /* Find the containing VIF's structure from a pointer in pending_tx_info array |
132 | */ | |
e9ce7cb6 | 133 | static inline struct xenvif_queue *ubuf_to_queue(const struct ubuf_info *ubuf) |
3e2234b3 | 134 | { |
f53c3fe8 ZK |
135 | u16 pending_idx = ubuf->desc; |
136 | struct pending_tx_info *temp = | |
137 | container_of(ubuf, struct pending_tx_info, callback_struct); | |
138 | return container_of(temp - pending_idx, | |
e9ce7cb6 | 139 | struct xenvif_queue, |
f53c3fe8 | 140 | pending_tx_info[0]); |
3e2234b3 | 141 | } |
f53c3fe8 | 142 | |
ea066ad1 IC |
143 | static u16 frag_get_pending_idx(skb_frag_t *frag) |
144 | { | |
145 | return (u16)frag->page_offset; | |
146 | } | |
147 | ||
148 | static void frag_set_pending_idx(skb_frag_t *frag, u16 pending_idx) | |
149 | { | |
150 | frag->page_offset = pending_idx; | |
151 | } | |
152 | ||
f942dc25 IC |
153 | static inline pending_ring_idx_t pending_index(unsigned i) |
154 | { | |
155 | return i & (MAX_PENDING_REQS-1); | |
156 | } | |
157 | ||
1d5d4852 | 158 | static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue) |
f942dc25 | 159 | { |
ca2f09f2 | 160 | RING_IDX prod, cons; |
99a2dea5 | 161 | struct sk_buff *skb; |
1d5d4852 DV |
162 | int needed; |
163 | ||
99a2dea5 DV |
164 | skb = skb_peek(&queue->rx_queue); |
165 | if (!skb) | |
166 | return false; | |
167 | ||
168 | needed = DIV_ROUND_UP(skb->len, XEN_PAGE_SIZE); | |
169 | if (skb_is_gso(skb)) | |
170 | needed++; | |
f07f9893 PD |
171 | if (skb->sw_hash) |
172 | needed++; | |
f942dc25 | 173 | |
ca2f09f2 | 174 | do { |
e9ce7cb6 WL |
175 | prod = queue->rx.sring->req_prod; |
176 | cons = queue->rx.req_cons; | |
f942dc25 | 177 | |
ca2f09f2 PD |
178 | if (prod - cons >= needed) |
179 | return true; | |
f942dc25 | 180 | |
e9ce7cb6 | 181 | queue->rx.sring->req_event = prod + 1; |
f942dc25 | 182 | |
ca2f09f2 PD |
183 | /* Make sure event is visible before we check prod |
184 | * again. | |
185 | */ | |
186 | mb(); | |
e9ce7cb6 | 187 | } while (queue->rx.sring->req_prod != prod); |
f942dc25 | 188 | |
ca2f09f2 | 189 | return false; |
f942dc25 IC |
190 | } |
191 | ||
f48da8b1 DV |
192 | void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb) |
193 | { | |
194 | unsigned long flags; | |
195 | ||
196 | spin_lock_irqsave(&queue->rx_queue.lock, flags); | |
197 | ||
198 | __skb_queue_tail(&queue->rx_queue, skb); | |
199 | ||
200 | queue->rx_queue_len += skb->len; | |
201 | if (queue->rx_queue_len > queue->rx_queue_max) | |
202 | netif_tx_stop_queue(netdev_get_tx_queue(queue->vif->dev, queue->id)); | |
203 | ||
204 | spin_unlock_irqrestore(&queue->rx_queue.lock, flags); | |
205 | } | |
206 | ||
207 | static struct sk_buff *xenvif_rx_dequeue(struct xenvif_queue *queue) | |
208 | { | |
209 | struct sk_buff *skb; | |
210 | ||
211 | spin_lock_irq(&queue->rx_queue.lock); | |
212 | ||
213 | skb = __skb_dequeue(&queue->rx_queue); | |
214 | if (skb) | |
215 | queue->rx_queue_len -= skb->len; | |
216 | ||
217 | spin_unlock_irq(&queue->rx_queue.lock); | |
218 | ||
219 | return skb; | |
220 | } | |
221 | ||
222 | static void xenvif_rx_queue_maybe_wake(struct xenvif_queue *queue) | |
223 | { | |
224 | spin_lock_irq(&queue->rx_queue.lock); | |
225 | ||
226 | if (queue->rx_queue_len < queue->rx_queue_max) | |
227 | netif_tx_wake_queue(netdev_get_tx_queue(queue->vif->dev, queue->id)); | |
228 | ||
229 | spin_unlock_irq(&queue->rx_queue.lock); | |
230 | } | |
231 | ||
232 | ||
233 | static void xenvif_rx_queue_purge(struct xenvif_queue *queue) | |
234 | { | |
235 | struct sk_buff *skb; | |
236 | while ((skb = xenvif_rx_dequeue(queue)) != NULL) | |
237 | kfree_skb(skb); | |
238 | } | |
239 | ||
240 | static void xenvif_rx_queue_drop_expired(struct xenvif_queue *queue) | |
241 | { | |
242 | struct sk_buff *skb; | |
243 | ||
244 | for(;;) { | |
245 | skb = skb_peek(&queue->rx_queue); | |
246 | if (!skb) | |
247 | break; | |
248 | if (time_before(jiffies, XENVIF_RX_CB(skb)->expires)) | |
249 | break; | |
250 | xenvif_rx_dequeue(queue); | |
251 | kfree_skb(skb); | |
252 | } | |
253 | } | |
254 | ||
f942dc25 IC |
255 | struct netrx_pending_operations { |
256 | unsigned copy_prod, copy_cons; | |
257 | unsigned meta_prod, meta_cons; | |
258 | struct gnttab_copy *copy; | |
b3f980bd | 259 | struct xenvif_rx_meta *meta; |
f942dc25 IC |
260 | int copy_off; |
261 | grant_ref_t copy_gref; | |
262 | }; | |
263 | ||
e9ce7cb6 | 264 | static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif_queue *queue, |
b3f980bd | 265 | struct netrx_pending_operations *npo) |
f942dc25 | 266 | { |
b3f980bd | 267 | struct xenvif_rx_meta *meta; |
68a33bfd | 268 | struct xen_netif_rx_request req; |
f942dc25 | 269 | |
68a33bfd | 270 | RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req); |
f942dc25 IC |
271 | |
272 | meta = npo->meta + npo->meta_prod++; | |
82cada22 | 273 | meta->gso_type = XEN_NETIF_GSO_TYPE_NONE; |
f942dc25 IC |
274 | meta->gso_size = 0; |
275 | meta->size = 0; | |
68a33bfd | 276 | meta->id = req.id; |
f942dc25 IC |
277 | |
278 | npo->copy_off = 0; | |
68a33bfd | 279 | npo->copy_gref = req.gref; |
f942dc25 IC |
280 | |
281 | return meta; | |
282 | } | |
283 | ||
d0089e8a JG |
284 | struct gop_frag_copy { |
285 | struct xenvif_queue *queue; | |
286 | struct netrx_pending_operations *npo; | |
287 | struct xenvif_rx_meta *meta; | |
288 | int head; | |
289 | int gso_type; | |
f07f9893 PD |
290 | int protocol; |
291 | int hash_present; | |
d0089e8a JG |
292 | |
293 | struct page *page; | |
294 | }; | |
295 | ||
296 | static void xenvif_setup_copy_gop(unsigned long gfn, | |
297 | unsigned int offset, | |
298 | unsigned int *len, | |
299 | struct gop_frag_copy *info) | |
300 | { | |
301 | struct gnttab_copy *copy_gop; | |
302 | struct xen_page_foreign *foreign; | |
303 | /* Convenient aliases */ | |
304 | struct xenvif_queue *queue = info->queue; | |
305 | struct netrx_pending_operations *npo = info->npo; | |
306 | struct page *page = info->page; | |
307 | ||
308 | BUG_ON(npo->copy_off > MAX_BUFFER_OFFSET); | |
309 | ||
310 | if (npo->copy_off == MAX_BUFFER_OFFSET) | |
311 | info->meta = get_next_rx_buffer(queue, npo); | |
312 | ||
313 | if (npo->copy_off + *len > MAX_BUFFER_OFFSET) | |
314 | *len = MAX_BUFFER_OFFSET - npo->copy_off; | |
315 | ||
316 | copy_gop = npo->copy + npo->copy_prod++; | |
317 | copy_gop->flags = GNTCOPY_dest_gref; | |
318 | copy_gop->len = *len; | |
319 | ||
320 | foreign = xen_page_foreign(page); | |
321 | if (foreign) { | |
322 | copy_gop->source.domid = foreign->domid; | |
323 | copy_gop->source.u.ref = foreign->gref; | |
324 | copy_gop->flags |= GNTCOPY_source_gref; | |
325 | } else { | |
326 | copy_gop->source.domid = DOMID_SELF; | |
327 | copy_gop->source.u.gmfn = gfn; | |
328 | } | |
329 | copy_gop->source.offset = offset; | |
330 | ||
331 | copy_gop->dest.domid = queue->vif->domid; | |
332 | copy_gop->dest.offset = npo->copy_off; | |
333 | copy_gop->dest.u.ref = npo->copy_gref; | |
334 | ||
335 | npo->copy_off += *len; | |
336 | info->meta->size += *len; | |
337 | ||
f07f9893 PD |
338 | if (!info->head) |
339 | return; | |
340 | ||
d0089e8a | 341 | /* Leave a gap for the GSO descriptor. */ |
f07f9893 PD |
342 | if ((1 << info->gso_type) & queue->vif->gso_mask) |
343 | queue->rx.req_cons++; | |
344 | ||
345 | /* Leave a gap for the hash extra segment. */ | |
346 | if (info->hash_present) | |
d0089e8a JG |
347 | queue->rx.req_cons++; |
348 | ||
349 | info->head = 0; /* There must be something in this buffer now */ | |
350 | } | |
351 | ||
352 | static void xenvif_gop_frag_copy_grant(unsigned long gfn, | |
353 | unsigned offset, | |
354 | unsigned int len, | |
355 | void *data) | |
356 | { | |
357 | unsigned int bytes; | |
358 | ||
359 | while (len) { | |
360 | bytes = len; | |
361 | xenvif_setup_copy_gop(gfn, offset, &bytes, data); | |
362 | offset += bytes; | |
363 | len -= bytes; | |
364 | } | |
365 | } | |
366 | ||
33bc801d WL |
367 | /* |
368 | * Set up the grant operations for this fragment. If it's a flipping | |
369 | * interface, we also set up the unmap request from here. | |
370 | */ | |
e9ce7cb6 | 371 | static void xenvif_gop_frag_copy(struct xenvif_queue *queue, struct sk_buff *skb, |
7376419a WL |
372 | struct netrx_pending_operations *npo, |
373 | struct page *page, unsigned long size, | |
c2677a6f | 374 | unsigned long offset, int *head) |
f942dc25 | 375 | { |
d0089e8a JG |
376 | struct gop_frag_copy info = { |
377 | .queue = queue, | |
378 | .npo = npo, | |
379 | .head = *head, | |
380 | .gso_type = XEN_NETIF_GSO_TYPE_NONE, | |
f07f9893 PD |
381 | /* xenvif_set_skb_hash() will have either set a s/w |
382 | * hash or cleared the hash depending on | |
383 | * whether the the frontend wants a hash for this skb. | |
384 | */ | |
385 | .hash_present = skb->sw_hash, | |
d0089e8a | 386 | }; |
f942dc25 IC |
387 | unsigned long bytes; |
388 | ||
a0f2e80f JG |
389 | if (skb_is_gso(skb)) { |
390 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) | |
d0089e8a | 391 | info.gso_type = XEN_NETIF_GSO_TYPE_TCPV4; |
a0f2e80f | 392 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
d0089e8a | 393 | info.gso_type = XEN_NETIF_GSO_TYPE_TCPV6; |
a0f2e80f JG |
394 | } |
395 | ||
f942dc25 | 396 | /* Data must not cross a page boundary. */ |
6a8ed462 | 397 | BUG_ON(size + offset > PAGE_SIZE<<compound_order(page)); |
f942dc25 | 398 | |
d0089e8a | 399 | info.meta = npo->meta + npo->meta_prod - 1; |
f942dc25 | 400 | |
6a8ed462 IC |
401 | /* Skip unused frames from start of page */ |
402 | page += offset >> PAGE_SHIFT; | |
403 | offset &= ~PAGE_MASK; | |
404 | ||
f942dc25 | 405 | while (size > 0) { |
6a8ed462 | 406 | BUG_ON(offset >= PAGE_SIZE); |
6a8ed462 | 407 | |
1650d545 | 408 | bytes = PAGE_SIZE - offset; |
6a8ed462 IC |
409 | if (bytes > size) |
410 | bytes = size; | |
411 | ||
d0089e8a JG |
412 | info.page = page; |
413 | gnttab_foreach_grant_in_range(page, offset, bytes, | |
414 | xenvif_gop_frag_copy_grant, | |
415 | &info); | |
f942dc25 | 416 | size -= bytes; |
d0089e8a | 417 | offset = 0; |
f942dc25 | 418 | |
d0089e8a JG |
419 | /* Next page */ |
420 | if (size) { | |
6a8ed462 IC |
421 | BUG_ON(!PageCompound(page)); |
422 | page++; | |
6a8ed462 | 423 | } |
f942dc25 | 424 | } |
d0089e8a JG |
425 | |
426 | *head = info.head; | |
f942dc25 IC |
427 | } |
428 | ||
429 | /* | |
430 | * Prepare an SKB to be transmitted to the frontend. | |
431 | * | |
432 | * This function is responsible for allocating grant operations, meta | |
433 | * structures, etc. | |
434 | * | |
435 | * It returns the number of meta structures consumed. The number of | |
436 | * ring slots used is always equal to the number of meta slots used | |
437 | * plus the number of GSO descriptors used. Currently, we use either | |
438 | * zero GSO descriptors (for non-GSO packets) or one descriptor (for | |
439 | * frontend-side LRO). | |
440 | */ | |
7376419a | 441 | static int xenvif_gop_skb(struct sk_buff *skb, |
e9ce7cb6 WL |
442 | struct netrx_pending_operations *npo, |
443 | struct xenvif_queue *queue) | |
f942dc25 IC |
444 | { |
445 | struct xenvif *vif = netdev_priv(skb->dev); | |
446 | int nr_frags = skb_shinfo(skb)->nr_frags; | |
447 | int i; | |
68a33bfd | 448 | struct xen_netif_rx_request req; |
b3f980bd | 449 | struct xenvif_rx_meta *meta; |
f942dc25 | 450 | unsigned char *data; |
33bc801d | 451 | int head = 1; |
f942dc25 | 452 | int old_meta_prod; |
82cada22 | 453 | int gso_type; |
f942dc25 IC |
454 | |
455 | old_meta_prod = npo->meta_prod; | |
456 | ||
5bd07670 AL |
457 | gso_type = XEN_NETIF_GSO_TYPE_NONE; |
458 | if (skb_is_gso(skb)) { | |
459 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) | |
460 | gso_type = XEN_NETIF_GSO_TYPE_TCPV4; | |
461 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | |
462 | gso_type = XEN_NETIF_GSO_TYPE_TCPV6; | |
82cada22 PD |
463 | } |
464 | ||
f942dc25 | 465 | /* Set up a GSO prefix descriptor, if necessary */ |
a3314f3d | 466 | if ((1 << gso_type) & vif->gso_prefix_mask) { |
68a33bfd | 467 | RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req); |
f942dc25 | 468 | meta = npo->meta + npo->meta_prod++; |
82cada22 | 469 | meta->gso_type = gso_type; |
5bd07670 | 470 | meta->gso_size = skb_shinfo(skb)->gso_size; |
f942dc25 | 471 | meta->size = 0; |
68a33bfd | 472 | meta->id = req.id; |
f942dc25 IC |
473 | } |
474 | ||
68a33bfd | 475 | RING_COPY_REQUEST(&queue->rx, queue->rx.req_cons++, &req); |
f942dc25 IC |
476 | meta = npo->meta + npo->meta_prod++; |
477 | ||
82cada22 PD |
478 | if ((1 << gso_type) & vif->gso_mask) { |
479 | meta->gso_type = gso_type; | |
5bd07670 | 480 | meta->gso_size = skb_shinfo(skb)->gso_size; |
82cada22 PD |
481 | } else { |
482 | meta->gso_type = XEN_NETIF_GSO_TYPE_NONE; | |
f942dc25 | 483 | meta->gso_size = 0; |
82cada22 | 484 | } |
f942dc25 IC |
485 | |
486 | meta->size = 0; | |
68a33bfd | 487 | meta->id = req.id; |
f942dc25 | 488 | npo->copy_off = 0; |
68a33bfd | 489 | npo->copy_gref = req.gref; |
f942dc25 IC |
490 | |
491 | data = skb->data; | |
492 | while (data < skb_tail_pointer(skb)) { | |
493 | unsigned int offset = offset_in_page(data); | |
494 | unsigned int len = PAGE_SIZE - offset; | |
495 | ||
496 | if (data + len > skb_tail_pointer(skb)) | |
497 | len = skb_tail_pointer(skb) - data; | |
498 | ||
e9ce7cb6 | 499 | xenvif_gop_frag_copy(queue, skb, npo, |
c2677a6f | 500 | virt_to_page(data), len, offset, &head); |
f942dc25 IC |
501 | data += len; |
502 | } | |
503 | ||
504 | for (i = 0; i < nr_frags; i++) { | |
e9ce7cb6 | 505 | xenvif_gop_frag_copy(queue, skb, npo, |
7376419a WL |
506 | skb_frag_page(&skb_shinfo(skb)->frags[i]), |
507 | skb_frag_size(&skb_shinfo(skb)->frags[i]), | |
508 | skb_shinfo(skb)->frags[i].page_offset, | |
c2677a6f | 509 | &head); |
f942dc25 IC |
510 | } |
511 | ||
512 | return npo->meta_prod - old_meta_prod; | |
513 | } | |
514 | ||
515 | /* | |
7376419a | 516 | * This is a twin to xenvif_gop_skb. Assume that xenvif_gop_skb was |
f942dc25 IC |
517 | * used to set up the operations on the top of |
518 | * netrx_pending_operations, which have since been done. Check that | |
519 | * they didn't give any errors and advance over them. | |
520 | */ | |
7376419a WL |
521 | static int xenvif_check_gop(struct xenvif *vif, int nr_meta_slots, |
522 | struct netrx_pending_operations *npo) | |
f942dc25 IC |
523 | { |
524 | struct gnttab_copy *copy_op; | |
525 | int status = XEN_NETIF_RSP_OKAY; | |
526 | int i; | |
527 | ||
528 | for (i = 0; i < nr_meta_slots; i++) { | |
529 | copy_op = npo->copy + npo->copy_cons++; | |
530 | if (copy_op->status != GNTST_okay) { | |
531 | netdev_dbg(vif->dev, | |
532 | "Bad status %d from copy to DOM%d.\n", | |
533 | copy_op->status, vif->domid); | |
534 | status = XEN_NETIF_RSP_ERROR; | |
535 | } | |
536 | } | |
537 | ||
538 | return status; | |
539 | } | |
540 | ||
e9ce7cb6 | 541 | static void xenvif_add_frag_responses(struct xenvif_queue *queue, int status, |
7376419a WL |
542 | struct xenvif_rx_meta *meta, |
543 | int nr_meta_slots) | |
f942dc25 IC |
544 | { |
545 | int i; | |
546 | unsigned long offset; | |
547 | ||
548 | /* No fragments used */ | |
549 | if (nr_meta_slots <= 1) | |
550 | return; | |
551 | ||
552 | nr_meta_slots--; | |
553 | ||
554 | for (i = 0; i < nr_meta_slots; i++) { | |
555 | int flags; | |
556 | if (i == nr_meta_slots - 1) | |
557 | flags = 0; | |
558 | else | |
559 | flags = XEN_NETRXF_more_data; | |
560 | ||
561 | offset = 0; | |
e9ce7cb6 | 562 | make_rx_response(queue, meta[i].id, status, offset, |
f942dc25 IC |
563 | meta[i].size, flags); |
564 | } | |
565 | } | |
566 | ||
e9ce7cb6 | 567 | void xenvif_kick_thread(struct xenvif_queue *queue) |
b3f980bd | 568 | { |
e9ce7cb6 | 569 | wake_up(&queue->wq); |
b3f980bd WL |
570 | } |
571 | ||
e9ce7cb6 | 572 | static void xenvif_rx_action(struct xenvif_queue *queue) |
f942dc25 | 573 | { |
f07f9893 | 574 | struct xenvif *vif = queue->vif; |
f942dc25 | 575 | s8 status; |
e1f00a69 | 576 | u16 flags; |
f942dc25 IC |
577 | struct xen_netif_rx_response *resp; |
578 | struct sk_buff_head rxq; | |
579 | struct sk_buff *skb; | |
580 | LIST_HEAD(notify); | |
581 | int ret; | |
f942dc25 | 582 | unsigned long offset; |
11b57f90 | 583 | bool need_to_notify = false; |
f942dc25 IC |
584 | |
585 | struct netrx_pending_operations npo = { | |
e9ce7cb6 WL |
586 | .copy = queue->grant_copy_op, |
587 | .meta = queue->meta, | |
f942dc25 IC |
588 | }; |
589 | ||
590 | skb_queue_head_init(&rxq); | |
591 | ||
1d5d4852 | 592 | while (xenvif_rx_ring_slots_available(queue) |
f48da8b1 | 593 | && (skb = xenvif_rx_dequeue(queue)) != NULL) { |
ecf08d2d DV |
594 | queue->last_rx_time = jiffies; |
595 | ||
e9ce7cb6 | 596 | XENVIF_RX_CB(skb)->meta_slots_used = xenvif_gop_skb(skb, &npo, queue); |
1425c7a4 | 597 | |
f942dc25 | 598 | __skb_queue_tail(&rxq, skb); |
f942dc25 IC |
599 | } |
600 | ||
e9ce7cb6 | 601 | BUG_ON(npo.meta_prod > ARRAY_SIZE(queue->meta)); |
f942dc25 IC |
602 | |
603 | if (!npo.copy_prod) | |
ca2f09f2 | 604 | goto done; |
f942dc25 | 605 | |
ac3d5ac2 | 606 | BUG_ON(npo.copy_prod > MAX_GRANT_COPY_OPS); |
e9ce7cb6 | 607 | gnttab_batch_copy(queue->grant_copy_op, npo.copy_prod); |
f942dc25 IC |
608 | |
609 | while ((skb = __skb_dequeue(&rxq)) != NULL) { | |
f07f9893 | 610 | struct xen_netif_extra_info *extra = NULL; |
f942dc25 | 611 | |
e9ce7cb6 | 612 | if ((1 << queue->meta[npo.meta_cons].gso_type) & |
f07f9893 | 613 | vif->gso_prefix_mask) { |
e9ce7cb6 WL |
614 | resp = RING_GET_RESPONSE(&queue->rx, |
615 | queue->rx.rsp_prod_pvt++); | |
f942dc25 IC |
616 | |
617 | resp->flags = XEN_NETRXF_gso_prefix | XEN_NETRXF_more_data; | |
618 | ||
e9ce7cb6 WL |
619 | resp->offset = queue->meta[npo.meta_cons].gso_size; |
620 | resp->id = queue->meta[npo.meta_cons].id; | |
8f13dd96 | 621 | resp->status = XENVIF_RX_CB(skb)->meta_slots_used; |
f942dc25 IC |
622 | |
623 | npo.meta_cons++; | |
8f13dd96 | 624 | XENVIF_RX_CB(skb)->meta_slots_used--; |
f942dc25 IC |
625 | } |
626 | ||
627 | ||
e9ce7cb6 WL |
628 | queue->stats.tx_bytes += skb->len; |
629 | queue->stats.tx_packets++; | |
f942dc25 | 630 | |
f07f9893 | 631 | status = xenvif_check_gop(vif, |
8f13dd96 ZK |
632 | XENVIF_RX_CB(skb)->meta_slots_used, |
633 | &npo); | |
f942dc25 | 634 | |
8f13dd96 | 635 | if (XENVIF_RX_CB(skb)->meta_slots_used == 1) |
f942dc25 IC |
636 | flags = 0; |
637 | else | |
638 | flags = XEN_NETRXF_more_data; | |
639 | ||
640 | if (skb->ip_summed == CHECKSUM_PARTIAL) /* local packet? */ | |
641 | flags |= XEN_NETRXF_csum_blank | XEN_NETRXF_data_validated; | |
642 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) | |
643 | /* remote but checksummed. */ | |
644 | flags |= XEN_NETRXF_data_validated; | |
645 | ||
646 | offset = 0; | |
e9ce7cb6 | 647 | resp = make_rx_response(queue, queue->meta[npo.meta_cons].id, |
f942dc25 | 648 | status, offset, |
e9ce7cb6 | 649 | queue->meta[npo.meta_cons].size, |
f942dc25 IC |
650 | flags); |
651 | ||
e9ce7cb6 | 652 | if ((1 << queue->meta[npo.meta_cons].gso_type) & |
f07f9893 PD |
653 | vif->gso_mask) { |
654 | extra = (struct xen_netif_extra_info *) | |
e9ce7cb6 WL |
655 | RING_GET_RESPONSE(&queue->rx, |
656 | queue->rx.rsp_prod_pvt++); | |
f942dc25 IC |
657 | |
658 | resp->flags |= XEN_NETRXF_extra_info; | |
659 | ||
f07f9893 PD |
660 | extra->u.gso.type = queue->meta[npo.meta_cons].gso_type; |
661 | extra->u.gso.size = queue->meta[npo.meta_cons].gso_size; | |
662 | extra->u.gso.pad = 0; | |
663 | extra->u.gso.features = 0; | |
664 | ||
665 | extra->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
666 | extra->flags = 0; | |
667 | } | |
668 | ||
669 | if (skb->sw_hash) { | |
670 | /* Since the skb got here via xenvif_select_queue() | |
671 | * we know that the hash has been re-calculated | |
672 | * according to a configuration set by the frontend | |
673 | * and therefore we know that it is legitimate to | |
674 | * pass it to the frontend. | |
675 | */ | |
676 | if (resp->flags & XEN_NETRXF_extra_info) | |
677 | extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; | |
678 | else | |
679 | resp->flags |= XEN_NETRXF_extra_info; | |
680 | ||
681 | extra = (struct xen_netif_extra_info *) | |
682 | RING_GET_RESPONSE(&queue->rx, | |
683 | queue->rx.rsp_prod_pvt++); | |
f942dc25 | 684 | |
f07f9893 PD |
685 | extra->u.hash.algorithm = |
686 | XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ; | |
687 | ||
688 | if (skb->l4_hash) | |
689 | extra->u.hash.type = | |
690 | skb->protocol == htons(ETH_P_IP) ? | |
691 | _XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP : | |
692 | _XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP; | |
693 | else | |
694 | extra->u.hash.type = | |
695 | skb->protocol == htons(ETH_P_IP) ? | |
696 | _XEN_NETIF_CTRL_HASH_TYPE_IPV4 : | |
697 | _XEN_NETIF_CTRL_HASH_TYPE_IPV6; | |
698 | ||
699 | *(uint32_t *)extra->u.hash.value = | |
700 | skb_get_hash_raw(skb); | |
701 | ||
702 | extra->type = XEN_NETIF_EXTRA_TYPE_HASH; | |
703 | extra->flags = 0; | |
f942dc25 IC |
704 | } |
705 | ||
e9ce7cb6 WL |
706 | xenvif_add_frag_responses(queue, status, |
707 | queue->meta + npo.meta_cons + 1, | |
8f13dd96 | 708 | XENVIF_RX_CB(skb)->meta_slots_used); |
f942dc25 | 709 | |
e9ce7cb6 | 710 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->rx, ret); |
f942dc25 | 711 | |
11b57f90 | 712 | need_to_notify |= !!ret; |
b3f980bd | 713 | |
8f13dd96 | 714 | npo.meta_cons += XENVIF_RX_CB(skb)->meta_slots_used; |
f942dc25 IC |
715 | dev_kfree_skb(skb); |
716 | } | |
717 | ||
ca2f09f2 | 718 | done: |
b3f980bd | 719 | if (need_to_notify) |
e9ce7cb6 | 720 | notify_remote_via_irq(queue->rx_irq); |
f942dc25 IC |
721 | } |
722 | ||
e9ce7cb6 | 723 | void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue) |
f942dc25 IC |
724 | { |
725 | int more_to_do; | |
726 | ||
e9ce7cb6 | 727 | RING_FINAL_CHECK_FOR_REQUESTS(&queue->tx, more_to_do); |
f942dc25 IC |
728 | |
729 | if (more_to_do) | |
e9ce7cb6 | 730 | napi_schedule(&queue->napi); |
f942dc25 IC |
731 | } |
732 | ||
e9ce7cb6 | 733 | static void tx_add_credit(struct xenvif_queue *queue) |
f942dc25 IC |
734 | { |
735 | unsigned long max_burst, max_credit; | |
736 | ||
737 | /* | |
738 | * Allow a burst big enough to transmit a jumbo packet of up to 128kB. | |
739 | * Otherwise the interface can seize up due to insufficient credit. | |
740 | */ | |
0f589967 | 741 | max_burst = max(131072UL, queue->credit_bytes); |
f942dc25 IC |
742 | |
743 | /* Take care that adding a new chunk of credit doesn't wrap to zero. */ | |
e9ce7cb6 WL |
744 | max_credit = queue->remaining_credit + queue->credit_bytes; |
745 | if (max_credit < queue->remaining_credit) | |
f942dc25 IC |
746 | max_credit = ULONG_MAX; /* wrapped: clamp to ULONG_MAX */ |
747 | ||
e9ce7cb6 | 748 | queue->remaining_credit = min(max_credit, max_burst); |
f942dc25 IC |
749 | } |
750 | ||
edafc132 | 751 | void xenvif_tx_credit_callback(unsigned long data) |
f942dc25 | 752 | { |
e9ce7cb6 WL |
753 | struct xenvif_queue *queue = (struct xenvif_queue *)data; |
754 | tx_add_credit(queue); | |
755 | xenvif_napi_schedule_or_enable_events(queue); | |
f942dc25 IC |
756 | } |
757 | ||
e9ce7cb6 | 758 | static void xenvif_tx_err(struct xenvif_queue *queue, |
562abd39 PD |
759 | struct xen_netif_tx_request *txp, |
760 | unsigned int extra_count, RING_IDX end) | |
f942dc25 | 761 | { |
e9ce7cb6 | 762 | RING_IDX cons = queue->tx.req_cons; |
f53c3fe8 | 763 | unsigned long flags; |
f942dc25 IC |
764 | |
765 | do { | |
e9ce7cb6 | 766 | spin_lock_irqsave(&queue->response_lock, flags); |
562abd39 | 767 | make_tx_response(queue, txp, extra_count, XEN_NETIF_RSP_ERROR); |
c8a4d299 | 768 | push_tx_responses(queue); |
e9ce7cb6 | 769 | spin_unlock_irqrestore(&queue->response_lock, flags); |
b9149729 | 770 | if (cons == end) |
f942dc25 | 771 | break; |
68a33bfd | 772 | RING_COPY_REQUEST(&queue->tx, cons++, txp); |
72eec92a | 773 | extra_count = 0; /* only the first frag can have extras */ |
f942dc25 | 774 | } while (1); |
e9ce7cb6 | 775 | queue->tx.req_cons = cons; |
f942dc25 IC |
776 | } |
777 | ||
7376419a | 778 | static void xenvif_fatal_tx_err(struct xenvif *vif) |
48856286 IC |
779 | { |
780 | netdev_err(vif->dev, "fatal error; disabling device\n"); | |
e9d8b2c2 | 781 | vif->disabled = true; |
e9ce7cb6 WL |
782 | /* Disable the vif from queue 0's kthread */ |
783 | if (vif->queues) | |
784 | xenvif_kick_thread(&vif->queues[0]); | |
48856286 IC |
785 | } |
786 | ||
e9ce7cb6 | 787 | static int xenvif_count_requests(struct xenvif_queue *queue, |
7376419a | 788 | struct xen_netif_tx_request *first, |
562abd39 | 789 | unsigned int extra_count, |
7376419a WL |
790 | struct xen_netif_tx_request *txp, |
791 | int work_to_do) | |
f942dc25 | 792 | { |
e9ce7cb6 | 793 | RING_IDX cons = queue->tx.req_cons; |
2810e5b9 WL |
794 | int slots = 0; |
795 | int drop_err = 0; | |
59ccb4eb | 796 | int more_data; |
f942dc25 IC |
797 | |
798 | if (!(first->flags & XEN_NETTXF_more_data)) | |
799 | return 0; | |
800 | ||
801 | do { | |
59ccb4eb WL |
802 | struct xen_netif_tx_request dropped_tx = { 0 }; |
803 | ||
2810e5b9 | 804 | if (slots >= work_to_do) { |
e9ce7cb6 | 805 | netdev_err(queue->vif->dev, |
2810e5b9 WL |
806 | "Asked for %d slots but exceeds this limit\n", |
807 | work_to_do); | |
e9ce7cb6 | 808 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 809 | return -ENODATA; |
f942dc25 IC |
810 | } |
811 | ||
2810e5b9 WL |
812 | /* This guest is really using too many slots and |
813 | * considered malicious. | |
814 | */ | |
37641494 | 815 | if (unlikely(slots >= fatal_skb_slots)) { |
e9ce7cb6 | 816 | netdev_err(queue->vif->dev, |
2810e5b9 | 817 | "Malicious frontend using %d slots, threshold %u\n", |
37641494 | 818 | slots, fatal_skb_slots); |
e9ce7cb6 | 819 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 820 | return -E2BIG; |
f942dc25 IC |
821 | } |
822 | ||
2810e5b9 | 823 | /* Xen network protocol had implicit dependency on |
37641494 WL |
824 | * MAX_SKB_FRAGS. XEN_NETBK_LEGACY_SLOTS_MAX is set to |
825 | * the historical MAX_SKB_FRAGS value 18 to honor the | |
826 | * same behavior as before. Any packet using more than | |
827 | * 18 slots but less than fatal_skb_slots slots is | |
828 | * dropped | |
2810e5b9 | 829 | */ |
37641494 | 830 | if (!drop_err && slots >= XEN_NETBK_LEGACY_SLOTS_MAX) { |
2810e5b9 | 831 | if (net_ratelimit()) |
e9ce7cb6 | 832 | netdev_dbg(queue->vif->dev, |
2810e5b9 | 833 | "Too many slots (%d) exceeding limit (%d), dropping packet\n", |
37641494 | 834 | slots, XEN_NETBK_LEGACY_SLOTS_MAX); |
2810e5b9 WL |
835 | drop_err = -E2BIG; |
836 | } | |
837 | ||
59ccb4eb WL |
838 | if (drop_err) |
839 | txp = &dropped_tx; | |
840 | ||
68a33bfd | 841 | RING_COPY_REQUEST(&queue->tx, cons + slots, txp); |
03393fd5 WL |
842 | |
843 | /* If the guest submitted a frame >= 64 KiB then | |
844 | * first->size overflowed and following slots will | |
845 | * appear to be larger than the frame. | |
846 | * | |
847 | * This cannot be fatal error as there are buggy | |
848 | * frontends that do this. | |
849 | * | |
850 | * Consume all slots and drop the packet. | |
851 | */ | |
852 | if (!drop_err && txp->size > first->size) { | |
853 | if (net_ratelimit()) | |
e9ce7cb6 | 854 | netdev_dbg(queue->vif->dev, |
03393fd5 WL |
855 | "Invalid tx request, slot size %u > remaining size %u\n", |
856 | txp->size, first->size); | |
857 | drop_err = -EIO; | |
f942dc25 IC |
858 | } |
859 | ||
860 | first->size -= txp->size; | |
2810e5b9 | 861 | slots++; |
f942dc25 | 862 | |
d0089e8a | 863 | if (unlikely((txp->offset + txp->size) > XEN_PAGE_SIZE)) { |
68946159 | 864 | netdev_err(queue->vif->dev, "Cross page boundary, txp->offset: %u, size: %u\n", |
f942dc25 | 865 | txp->offset, txp->size); |
e9ce7cb6 | 866 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 867 | return -EINVAL; |
f942dc25 | 868 | } |
59ccb4eb WL |
869 | |
870 | more_data = txp->flags & XEN_NETTXF_more_data; | |
871 | ||
872 | if (!drop_err) | |
873 | txp++; | |
874 | ||
875 | } while (more_data); | |
2810e5b9 WL |
876 | |
877 | if (drop_err) { | |
562abd39 | 878 | xenvif_tx_err(queue, first, extra_count, cons + slots); |
2810e5b9 WL |
879 | return drop_err; |
880 | } | |
881 | ||
882 | return slots; | |
f942dc25 IC |
883 | } |
884 | ||
8f13dd96 ZK |
885 | |
886 | struct xenvif_tx_cb { | |
887 | u16 pending_idx; | |
888 | }; | |
889 | ||
890 | #define XENVIF_TX_CB(skb) ((struct xenvif_tx_cb *)(skb)->cb) | |
891 | ||
e9ce7cb6 | 892 | static inline void xenvif_tx_create_map_op(struct xenvif_queue *queue, |
562abd39 PD |
893 | u16 pending_idx, |
894 | struct xen_netif_tx_request *txp, | |
895 | unsigned int extra_count, | |
896 | struct gnttab_map_grant_ref *mop) | |
f53c3fe8 | 897 | { |
e9ce7cb6 WL |
898 | queue->pages_to_map[mop-queue->tx_map_ops] = queue->mmap_pages[pending_idx]; |
899 | gnttab_set_map_op(mop, idx_to_kaddr(queue, pending_idx), | |
f53c3fe8 | 900 | GNTMAP_host_map | GNTMAP_readonly, |
e9ce7cb6 | 901 | txp->gref, queue->vif->domid); |
f53c3fe8 | 902 | |
e9ce7cb6 | 903 | memcpy(&queue->pending_tx_info[pending_idx].req, txp, |
f53c3fe8 | 904 | sizeof(*txp)); |
562abd39 | 905 | queue->pending_tx_info[pending_idx].extra_count = extra_count; |
f53c3fe8 ZK |
906 | } |
907 | ||
e3377f36 ZK |
908 | static inline struct sk_buff *xenvif_alloc_skb(unsigned int size) |
909 | { | |
910 | struct sk_buff *skb = | |
911 | alloc_skb(size + NET_SKB_PAD + NET_IP_ALIGN, | |
912 | GFP_ATOMIC | __GFP_NOWARN); | |
913 | if (unlikely(skb == NULL)) | |
914 | return NULL; | |
915 | ||
916 | /* Packets passed to netif_rx() must have some headroom. */ | |
917 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); | |
918 | ||
919 | /* Initialize it here to avoid later surprises */ | |
920 | skb_shinfo(skb)->destructor_arg = NULL; | |
921 | ||
922 | return skb; | |
923 | } | |
924 | ||
e9ce7cb6 | 925 | static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif_queue *queue, |
f53c3fe8 ZK |
926 | struct sk_buff *skb, |
927 | struct xen_netif_tx_request *txp, | |
2475b225 RL |
928 | struct gnttab_map_grant_ref *gop, |
929 | unsigned int frag_overflow, | |
930 | struct sk_buff *nskb) | |
f942dc25 IC |
931 | { |
932 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
933 | skb_frag_t *frags = shinfo->frags; | |
8f13dd96 | 934 | u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx; |
62bad319 ZK |
935 | int start; |
936 | pending_ring_idx_t index; | |
2475b225 | 937 | unsigned int nr_slots; |
2810e5b9 | 938 | |
2810e5b9 | 939 | nr_slots = shinfo->nr_frags; |
f942dc25 IC |
940 | |
941 | /* Skip first skb fragment if it is on same page as header fragment. */ | |
ea066ad1 | 942 | start = (frag_get_pending_idx(&shinfo->frags[0]) == pending_idx); |
f942dc25 | 943 | |
f53c3fe8 ZK |
944 | for (shinfo->nr_frags = start; shinfo->nr_frags < nr_slots; |
945 | shinfo->nr_frags++, txp++, gop++) { | |
e9ce7cb6 WL |
946 | index = pending_index(queue->pending_cons++); |
947 | pending_idx = queue->pending_ring[index]; | |
562abd39 | 948 | xenvif_tx_create_map_op(queue, pending_idx, txp, 0, gop); |
f53c3fe8 | 949 | frag_set_pending_idx(&frags[shinfo->nr_frags], pending_idx); |
f942dc25 IC |
950 | } |
951 | ||
e3377f36 | 952 | if (frag_overflow) { |
e3377f36 ZK |
953 | |
954 | shinfo = skb_shinfo(nskb); | |
955 | frags = shinfo->frags; | |
956 | ||
957 | for (shinfo->nr_frags = 0; shinfo->nr_frags < frag_overflow; | |
958 | shinfo->nr_frags++, txp++, gop++) { | |
e9ce7cb6 WL |
959 | index = pending_index(queue->pending_cons++); |
960 | pending_idx = queue->pending_ring[index]; | |
562abd39 PD |
961 | xenvif_tx_create_map_op(queue, pending_idx, txp, 0, |
962 | gop); | |
e3377f36 ZK |
963 | frag_set_pending_idx(&frags[shinfo->nr_frags], |
964 | pending_idx); | |
965 | } | |
966 | ||
967 | skb_shinfo(skb)->frag_list = nskb; | |
968 | } | |
2810e5b9 | 969 | |
f942dc25 IC |
970 | return gop; |
971 | } | |
972 | ||
e9ce7cb6 | 973 | static inline void xenvif_grant_handle_set(struct xenvif_queue *queue, |
f53c3fe8 ZK |
974 | u16 pending_idx, |
975 | grant_handle_t handle) | |
976 | { | |
e9ce7cb6 | 977 | if (unlikely(queue->grant_tx_handle[pending_idx] != |
f53c3fe8 | 978 | NETBACK_INVALID_HANDLE)) { |
e9ce7cb6 | 979 | netdev_err(queue->vif->dev, |
68946159 | 980 | "Trying to overwrite active handle! pending_idx: 0x%x\n", |
f53c3fe8 ZK |
981 | pending_idx); |
982 | BUG(); | |
983 | } | |
e9ce7cb6 | 984 | queue->grant_tx_handle[pending_idx] = handle; |
f53c3fe8 ZK |
985 | } |
986 | ||
e9ce7cb6 | 987 | static inline void xenvif_grant_handle_reset(struct xenvif_queue *queue, |
f53c3fe8 ZK |
988 | u16 pending_idx) |
989 | { | |
e9ce7cb6 | 990 | if (unlikely(queue->grant_tx_handle[pending_idx] == |
f53c3fe8 | 991 | NETBACK_INVALID_HANDLE)) { |
e9ce7cb6 | 992 | netdev_err(queue->vif->dev, |
68946159 | 993 | "Trying to unmap invalid handle! pending_idx: 0x%x\n", |
f53c3fe8 ZK |
994 | pending_idx); |
995 | BUG(); | |
996 | } | |
e9ce7cb6 | 997 | queue->grant_tx_handle[pending_idx] = NETBACK_INVALID_HANDLE; |
f53c3fe8 ZK |
998 | } |
999 | ||
e9ce7cb6 | 1000 | static int xenvif_tx_check_gop(struct xenvif_queue *queue, |
7376419a | 1001 | struct sk_buff *skb, |
bdab8275 ZK |
1002 | struct gnttab_map_grant_ref **gopp_map, |
1003 | struct gnttab_copy **gopp_copy) | |
f942dc25 | 1004 | { |
9074ce24 | 1005 | struct gnttab_map_grant_ref *gop_map = *gopp_map; |
8f13dd96 | 1006 | u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx; |
1a998d3e ZK |
1007 | /* This always points to the shinfo of the skb being checked, which |
1008 | * could be either the first or the one on the frag_list | |
1009 | */ | |
f942dc25 | 1010 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
1a998d3e ZK |
1011 | /* If this is non-NULL, we are currently checking the frag_list skb, and |
1012 | * this points to the shinfo of the first one | |
1013 | */ | |
1014 | struct skb_shared_info *first_shinfo = NULL; | |
f942dc25 | 1015 | int nr_frags = shinfo->nr_frags; |
1b860da0 ZK |
1016 | const bool sharedslot = nr_frags && |
1017 | frag_get_pending_idx(&shinfo->frags[0]) == pending_idx; | |
bdab8275 | 1018 | int i, err; |
f942dc25 IC |
1019 | |
1020 | /* Check status of header. */ | |
bdab8275 | 1021 | err = (*gopp_copy)->status; |
bdab8275 ZK |
1022 | if (unlikely(err)) { |
1023 | if (net_ratelimit()) | |
e9ce7cb6 | 1024 | netdev_dbg(queue->vif->dev, |
00aefceb | 1025 | "Grant copy of header failed! status: %d pending_idx: %u ref: %u\n", |
bdab8275 ZK |
1026 | (*gopp_copy)->status, |
1027 | pending_idx, | |
1028 | (*gopp_copy)->source.u.ref); | |
1b860da0 ZK |
1029 | /* The first frag might still have this slot mapped */ |
1030 | if (!sharedslot) | |
1031 | xenvif_idx_release(queue, pending_idx, | |
1032 | XEN_NETIF_RSP_ERROR); | |
bdab8275 | 1033 | } |
d8cfbfc4 | 1034 | (*gopp_copy)++; |
f942dc25 | 1035 | |
e3377f36 | 1036 | check_frags: |
bdab8275 | 1037 | for (i = 0; i < nr_frags; i++, gop_map++) { |
f942dc25 | 1038 | int j, newerr; |
f942dc25 | 1039 | |
ea066ad1 | 1040 | pending_idx = frag_get_pending_idx(&shinfo->frags[i]); |
f942dc25 IC |
1041 | |
1042 | /* Check error status: if okay then remember grant handle. */ | |
bdab8275 | 1043 | newerr = gop_map->status; |
2810e5b9 | 1044 | |
f942dc25 | 1045 | if (likely(!newerr)) { |
e9ce7cb6 | 1046 | xenvif_grant_handle_set(queue, |
9074ce24 ZK |
1047 | pending_idx, |
1048 | gop_map->handle); | |
f942dc25 | 1049 | /* Had a previous error? Invalidate this fragment. */ |
1b860da0 | 1050 | if (unlikely(err)) { |
e9ce7cb6 | 1051 | xenvif_idx_unmap(queue, pending_idx); |
1b860da0 ZK |
1052 | /* If the mapping of the first frag was OK, but |
1053 | * the header's copy failed, and they are | |
1054 | * sharing a slot, send an error | |
1055 | */ | |
1056 | if (i == 0 && sharedslot) | |
1057 | xenvif_idx_release(queue, pending_idx, | |
1058 | XEN_NETIF_RSP_ERROR); | |
1059 | else | |
1060 | xenvif_idx_release(queue, pending_idx, | |
1061 | XEN_NETIF_RSP_OKAY); | |
1062 | } | |
f942dc25 IC |
1063 | continue; |
1064 | } | |
1065 | ||
1066 | /* Error on this fragment: respond to client with an error. */ | |
bdab8275 | 1067 | if (net_ratelimit()) |
e9ce7cb6 | 1068 | netdev_dbg(queue->vif->dev, |
00aefceb | 1069 | "Grant map of %d. frag failed! status: %d pending_idx: %u ref: %u\n", |
bdab8275 ZK |
1070 | i, |
1071 | gop_map->status, | |
1072 | pending_idx, | |
1073 | gop_map->ref); | |
1b860da0 | 1074 | |
e9ce7cb6 | 1075 | xenvif_idx_release(queue, pending_idx, XEN_NETIF_RSP_ERROR); |
f942dc25 IC |
1076 | |
1077 | /* Not the first error? Preceding frags already invalidated. */ | |
1078 | if (err) | |
1079 | continue; | |
1b860da0 ZK |
1080 | |
1081 | /* First error: if the header haven't shared a slot with the | |
1082 | * first frag, release it as well. | |
1083 | */ | |
1084 | if (!sharedslot) | |
1085 | xenvif_idx_release(queue, | |
1086 | XENVIF_TX_CB(skb)->pending_idx, | |
1087 | XEN_NETIF_RSP_OKAY); | |
1088 | ||
1089 | /* Invalidate preceding fragments of this skb. */ | |
bdab8275 | 1090 | for (j = 0; j < i; j++) { |
5ccb3ea7 | 1091 | pending_idx = frag_get_pending_idx(&shinfo->frags[j]); |
e9ce7cb6 | 1092 | xenvif_idx_unmap(queue, pending_idx); |
1b860da0 ZK |
1093 | xenvif_idx_release(queue, pending_idx, |
1094 | XEN_NETIF_RSP_OKAY); | |
f942dc25 IC |
1095 | } |
1096 | ||
1a998d3e ZK |
1097 | /* And if we found the error while checking the frag_list, unmap |
1098 | * the first skb's frags | |
1099 | */ | |
1100 | if (first_shinfo) { | |
1101 | for (j = 0; j < first_shinfo->nr_frags; j++) { | |
1102 | pending_idx = frag_get_pending_idx(&first_shinfo->frags[j]); | |
1103 | xenvif_idx_unmap(queue, pending_idx); | |
1b860da0 ZK |
1104 | xenvif_idx_release(queue, pending_idx, |
1105 | XEN_NETIF_RSP_OKAY); | |
1a998d3e | 1106 | } |
f942dc25 IC |
1107 | } |
1108 | ||
1109 | /* Remember the error: invalidate all subsequent fragments. */ | |
1110 | err = newerr; | |
1111 | } | |
1112 | ||
1a998d3e ZK |
1113 | if (skb_has_frag_list(skb) && !first_shinfo) { |
1114 | first_shinfo = skb_shinfo(skb); | |
1115 | shinfo = skb_shinfo(skb_shinfo(skb)->frag_list); | |
e3377f36 | 1116 | nr_frags = shinfo->nr_frags; |
e3377f36 ZK |
1117 | |
1118 | goto check_frags; | |
1119 | } | |
1120 | ||
bdab8275 | 1121 | *gopp_map = gop_map; |
f942dc25 IC |
1122 | return err; |
1123 | } | |
1124 | ||
e9ce7cb6 | 1125 | static void xenvif_fill_frags(struct xenvif_queue *queue, struct sk_buff *skb) |
f942dc25 IC |
1126 | { |
1127 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
1128 | int nr_frags = shinfo->nr_frags; | |
1129 | int i; | |
f53c3fe8 ZK |
1130 | u16 prev_pending_idx = INVALID_PENDING_IDX; |
1131 | ||
f942dc25 IC |
1132 | for (i = 0; i < nr_frags; i++) { |
1133 | skb_frag_t *frag = shinfo->frags + i; | |
1134 | struct xen_netif_tx_request *txp; | |
ea066ad1 IC |
1135 | struct page *page; |
1136 | u16 pending_idx; | |
f942dc25 | 1137 | |
ea066ad1 | 1138 | pending_idx = frag_get_pending_idx(frag); |
f942dc25 | 1139 | |
f53c3fe8 | 1140 | /* If this is not the first frag, chain it to the previous*/ |
bdab8275 | 1141 | if (prev_pending_idx == INVALID_PENDING_IDX) |
f53c3fe8 | 1142 | skb_shinfo(skb)->destructor_arg = |
e9ce7cb6 | 1143 | &callback_param(queue, pending_idx); |
bdab8275 | 1144 | else |
e9ce7cb6 WL |
1145 | callback_param(queue, prev_pending_idx).ctx = |
1146 | &callback_param(queue, pending_idx); | |
f53c3fe8 | 1147 | |
e9ce7cb6 | 1148 | callback_param(queue, pending_idx).ctx = NULL; |
f53c3fe8 ZK |
1149 | prev_pending_idx = pending_idx; |
1150 | ||
e9ce7cb6 WL |
1151 | txp = &queue->pending_tx_info[pending_idx].req; |
1152 | page = virt_to_page(idx_to_kaddr(queue, pending_idx)); | |
ea066ad1 | 1153 | __skb_fill_page_desc(skb, i, page, txp->offset, txp->size); |
f942dc25 IC |
1154 | skb->len += txp->size; |
1155 | skb->data_len += txp->size; | |
1156 | skb->truesize += txp->size; | |
1157 | ||
f53c3fe8 | 1158 | /* Take an extra reference to offset network stack's put_page */ |
e9ce7cb6 | 1159 | get_page(queue->mmap_pages[pending_idx]); |
f942dc25 IC |
1160 | } |
1161 | } | |
1162 | ||
e9ce7cb6 | 1163 | static int xenvif_get_extras(struct xenvif_queue *queue, |
562abd39 PD |
1164 | struct xen_netif_extra_info *extras, |
1165 | unsigned int *extra_count, | |
1166 | int work_to_do) | |
f942dc25 IC |
1167 | { |
1168 | struct xen_netif_extra_info extra; | |
e9ce7cb6 | 1169 | RING_IDX cons = queue->tx.req_cons; |
f942dc25 IC |
1170 | |
1171 | do { | |
1172 | if (unlikely(work_to_do-- <= 0)) { | |
e9ce7cb6 WL |
1173 | netdev_err(queue->vif->dev, "Missing extra info\n"); |
1174 | xenvif_fatal_tx_err(queue->vif); | |
f942dc25 IC |
1175 | return -EBADR; |
1176 | } | |
1177 | ||
68a33bfd | 1178 | RING_COPY_REQUEST(&queue->tx, cons, &extra); |
562abd39 PD |
1179 | |
1180 | queue->tx.req_cons = ++cons; | |
1181 | (*extra_count)++; | |
1182 | ||
f942dc25 IC |
1183 | if (unlikely(!extra.type || |
1184 | extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
e9ce7cb6 | 1185 | netdev_err(queue->vif->dev, |
f942dc25 | 1186 | "Invalid extra type: %d\n", extra.type); |
e9ce7cb6 | 1187 | xenvif_fatal_tx_err(queue->vif); |
f942dc25 IC |
1188 | return -EINVAL; |
1189 | } | |
1190 | ||
1191 | memcpy(&extras[extra.type - 1], &extra, sizeof(extra)); | |
f942dc25 IC |
1192 | } while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE); |
1193 | ||
1194 | return work_to_do; | |
1195 | } | |
1196 | ||
7376419a WL |
1197 | static int xenvif_set_skb_gso(struct xenvif *vif, |
1198 | struct sk_buff *skb, | |
1199 | struct xen_netif_extra_info *gso) | |
f942dc25 IC |
1200 | { |
1201 | if (!gso->u.gso.size) { | |
48856286 | 1202 | netdev_err(vif->dev, "GSO size must not be zero.\n"); |
7376419a | 1203 | xenvif_fatal_tx_err(vif); |
f942dc25 IC |
1204 | return -EINVAL; |
1205 | } | |
1206 | ||
a9468587 PD |
1207 | switch (gso->u.gso.type) { |
1208 | case XEN_NETIF_GSO_TYPE_TCPV4: | |
1209 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
1210 | break; | |
1211 | case XEN_NETIF_GSO_TYPE_TCPV6: | |
1212 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
1213 | break; | |
1214 | default: | |
48856286 | 1215 | netdev_err(vif->dev, "Bad GSO type %d.\n", gso->u.gso.type); |
7376419a | 1216 | xenvif_fatal_tx_err(vif); |
f942dc25 IC |
1217 | return -EINVAL; |
1218 | } | |
1219 | ||
1220 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
b89587a7 | 1221 | /* gso_segs will be calculated later */ |
f942dc25 IC |
1222 | |
1223 | return 0; | |
1224 | } | |
1225 | ||
e9ce7cb6 | 1226 | static int checksum_setup(struct xenvif_queue *queue, struct sk_buff *skb) |
2eba61d5 | 1227 | { |
2721637c | 1228 | bool recalculate_partial_csum = false; |
2eba61d5 PD |
1229 | |
1230 | /* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
1231 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
1232 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
1233 | * recalculate the partial checksum. | |
1234 | */ | |
1235 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
e9ce7cb6 | 1236 | queue->stats.rx_gso_checksum_fixup++; |
2eba61d5 | 1237 | skb->ip_summed = CHECKSUM_PARTIAL; |
2721637c | 1238 | recalculate_partial_csum = true; |
2eba61d5 PD |
1239 | } |
1240 | ||
1241 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
1242 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
1243 | return 0; | |
1244 | ||
2721637c | 1245 | return skb_checksum_setup(skb, recalculate_partial_csum); |
2eba61d5 PD |
1246 | } |
1247 | ||
e9ce7cb6 | 1248 | static bool tx_credit_exceeded(struct xenvif_queue *queue, unsigned size) |
f942dc25 | 1249 | { |
059dfa6a | 1250 | u64 now = get_jiffies_64(); |
e9ce7cb6 WL |
1251 | u64 next_credit = queue->credit_window_start + |
1252 | msecs_to_jiffies(queue->credit_usec / 1000); | |
f942dc25 IC |
1253 | |
1254 | /* Timer could already be pending in rare cases. */ | |
e9ce7cb6 | 1255 | if (timer_pending(&queue->credit_timeout)) |
f942dc25 IC |
1256 | return true; |
1257 | ||
1258 | /* Passed the point where we can replenish credit? */ | |
059dfa6a | 1259 | if (time_after_eq64(now, next_credit)) { |
e9ce7cb6 WL |
1260 | queue->credit_window_start = now; |
1261 | tx_add_credit(queue); | |
f942dc25 IC |
1262 | } |
1263 | ||
1264 | /* Still too big to send right now? Set a callback. */ | |
e9ce7cb6 WL |
1265 | if (size > queue->remaining_credit) { |
1266 | queue->credit_timeout.data = | |
1267 | (unsigned long)queue; | |
e9ce7cb6 | 1268 | mod_timer(&queue->credit_timeout, |
f942dc25 | 1269 | next_credit); |
e9ce7cb6 | 1270 | queue->credit_window_start = next_credit; |
f942dc25 IC |
1271 | |
1272 | return true; | |
1273 | } | |
1274 | ||
1275 | return false; | |
1276 | } | |
1277 | ||
210c34dc PD |
1278 | /* No locking is required in xenvif_mcast_add/del() as they are |
1279 | * only ever invoked from NAPI poll. An RCU list is used because | |
1280 | * xenvif_mcast_match() is called asynchronously, during start_xmit. | |
1281 | */ | |
1282 | ||
1283 | static int xenvif_mcast_add(struct xenvif *vif, const u8 *addr) | |
1284 | { | |
1285 | struct xenvif_mcast_addr *mcast; | |
1286 | ||
1287 | if (vif->fe_mcast_count == XEN_NETBK_MCAST_MAX) { | |
1288 | if (net_ratelimit()) | |
1289 | netdev_err(vif->dev, | |
1290 | "Too many multicast addresses\n"); | |
1291 | return -ENOSPC; | |
1292 | } | |
1293 | ||
1294 | mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC); | |
1295 | if (!mcast) | |
1296 | return -ENOMEM; | |
1297 | ||
1298 | ether_addr_copy(mcast->addr, addr); | |
1299 | list_add_tail_rcu(&mcast->entry, &vif->fe_mcast_addr); | |
1300 | vif->fe_mcast_count++; | |
1301 | ||
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | static void xenvif_mcast_del(struct xenvif *vif, const u8 *addr) | |
1306 | { | |
1307 | struct xenvif_mcast_addr *mcast; | |
1308 | ||
1309 | list_for_each_entry_rcu(mcast, &vif->fe_mcast_addr, entry) { | |
1310 | if (ether_addr_equal(addr, mcast->addr)) { | |
1311 | --vif->fe_mcast_count; | |
1312 | list_del_rcu(&mcast->entry); | |
1313 | kfree_rcu(mcast, rcu); | |
1314 | break; | |
1315 | } | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | bool xenvif_mcast_match(struct xenvif *vif, const u8 *addr) | |
1320 | { | |
1321 | struct xenvif_mcast_addr *mcast; | |
1322 | ||
1323 | rcu_read_lock(); | |
1324 | list_for_each_entry_rcu(mcast, &vif->fe_mcast_addr, entry) { | |
1325 | if (ether_addr_equal(addr, mcast->addr)) { | |
1326 | rcu_read_unlock(); | |
1327 | return true; | |
1328 | } | |
1329 | } | |
1330 | rcu_read_unlock(); | |
1331 | ||
1332 | return false; | |
1333 | } | |
1334 | ||
1335 | void xenvif_mcast_addr_list_free(struct xenvif *vif) | |
1336 | { | |
1337 | /* No need for locking or RCU here. NAPI poll and TX queue | |
1338 | * are stopped. | |
1339 | */ | |
1340 | while (!list_empty(&vif->fe_mcast_addr)) { | |
1341 | struct xenvif_mcast_addr *mcast; | |
1342 | ||
1343 | mcast = list_first_entry(&vif->fe_mcast_addr, | |
1344 | struct xenvif_mcast_addr, | |
1345 | entry); | |
1346 | --vif->fe_mcast_count; | |
1347 | list_del(&mcast->entry); | |
1348 | kfree(mcast); | |
1349 | } | |
1350 | } | |
1351 | ||
e9ce7cb6 | 1352 | static void xenvif_tx_build_gops(struct xenvif_queue *queue, |
bdab8275 ZK |
1353 | int budget, |
1354 | unsigned *copy_ops, | |
1355 | unsigned *map_ops) | |
f942dc25 | 1356 | { |
2475b225 RL |
1357 | struct gnttab_map_grant_ref *gop = queue->tx_map_ops; |
1358 | struct sk_buff *skb, *nskb; | |
f942dc25 | 1359 | int ret; |
2475b225 | 1360 | unsigned int frag_overflow; |
f942dc25 | 1361 | |
e9ce7cb6 | 1362 | while (skb_queue_len(&queue->tx_queue) < budget) { |
f942dc25 | 1363 | struct xen_netif_tx_request txreq; |
37641494 | 1364 | struct xen_netif_tx_request txfrags[XEN_NETBK_LEGACY_SLOTS_MAX]; |
f942dc25 | 1365 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX-1]; |
562abd39 | 1366 | unsigned int extra_count; |
f942dc25 IC |
1367 | u16 pending_idx; |
1368 | RING_IDX idx; | |
1369 | int work_to_do; | |
1370 | unsigned int data_len; | |
1371 | pending_ring_idx_t index; | |
1372 | ||
e9ce7cb6 | 1373 | if (queue->tx.sring->req_prod - queue->tx.req_cons > |
48856286 | 1374 | XEN_NETIF_TX_RING_SIZE) { |
e9ce7cb6 | 1375 | netdev_err(queue->vif->dev, |
48856286 IC |
1376 | "Impossible number of requests. " |
1377 | "req_prod %d, req_cons %d, size %ld\n", | |
e9ce7cb6 | 1378 | queue->tx.sring->req_prod, queue->tx.req_cons, |
48856286 | 1379 | XEN_NETIF_TX_RING_SIZE); |
e9ce7cb6 | 1380 | xenvif_fatal_tx_err(queue->vif); |
e9d8b2c2 | 1381 | break; |
48856286 IC |
1382 | } |
1383 | ||
e9ce7cb6 | 1384 | work_to_do = RING_HAS_UNCONSUMED_REQUESTS(&queue->tx); |
b3f980bd WL |
1385 | if (!work_to_do) |
1386 | break; | |
f942dc25 | 1387 | |
e9ce7cb6 | 1388 | idx = queue->tx.req_cons; |
f942dc25 | 1389 | rmb(); /* Ensure that we see the request before we copy it. */ |
68a33bfd | 1390 | RING_COPY_REQUEST(&queue->tx, idx, &txreq); |
f942dc25 IC |
1391 | |
1392 | /* Credit-based scheduling. */ | |
e9ce7cb6 WL |
1393 | if (txreq.size > queue->remaining_credit && |
1394 | tx_credit_exceeded(queue, txreq.size)) | |
b3f980bd | 1395 | break; |
f942dc25 | 1396 | |
e9ce7cb6 | 1397 | queue->remaining_credit -= txreq.size; |
f942dc25 IC |
1398 | |
1399 | work_to_do--; | |
e9ce7cb6 | 1400 | queue->tx.req_cons = ++idx; |
f942dc25 IC |
1401 | |
1402 | memset(extras, 0, sizeof(extras)); | |
562abd39 | 1403 | extra_count = 0; |
f942dc25 | 1404 | if (txreq.flags & XEN_NETTXF_extra_info) { |
e9ce7cb6 | 1405 | work_to_do = xenvif_get_extras(queue, extras, |
562abd39 | 1406 | &extra_count, |
7376419a | 1407 | work_to_do); |
e9ce7cb6 | 1408 | idx = queue->tx.req_cons; |
48856286 | 1409 | if (unlikely(work_to_do < 0)) |
b3f980bd | 1410 | break; |
f942dc25 IC |
1411 | } |
1412 | ||
210c34dc PD |
1413 | if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1].type) { |
1414 | struct xen_netif_extra_info *extra; | |
1415 | ||
1416 | extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1]; | |
1417 | ret = xenvif_mcast_add(queue->vif, extra->u.mcast.addr); | |
1418 | ||
562abd39 | 1419 | make_tx_response(queue, &txreq, extra_count, |
210c34dc PD |
1420 | (ret == 0) ? |
1421 | XEN_NETIF_RSP_OKAY : | |
1422 | XEN_NETIF_RSP_ERROR); | |
1423 | push_tx_responses(queue); | |
1424 | continue; | |
1425 | } | |
1426 | ||
1427 | if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1].type) { | |
1428 | struct xen_netif_extra_info *extra; | |
1429 | ||
1430 | extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1]; | |
1431 | xenvif_mcast_del(queue->vif, extra->u.mcast.addr); | |
1432 | ||
562abd39 PD |
1433 | make_tx_response(queue, &txreq, extra_count, |
1434 | XEN_NETIF_RSP_OKAY); | |
210c34dc PD |
1435 | push_tx_responses(queue); |
1436 | continue; | |
1437 | } | |
1438 | ||
562abd39 PD |
1439 | ret = xenvif_count_requests(queue, &txreq, extra_count, |
1440 | txfrags, work_to_do); | |
48856286 | 1441 | if (unlikely(ret < 0)) |
b3f980bd | 1442 | break; |
48856286 | 1443 | |
f942dc25 IC |
1444 | idx += ret; |
1445 | ||
1446 | if (unlikely(txreq.size < ETH_HLEN)) { | |
e9ce7cb6 | 1447 | netdev_dbg(queue->vif->dev, |
f942dc25 | 1448 | "Bad packet size: %d\n", txreq.size); |
562abd39 | 1449 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
b3f980bd | 1450 | break; |
f942dc25 IC |
1451 | } |
1452 | ||
1453 | /* No crossing a page as the payload mustn't fragment. */ | |
d0089e8a | 1454 | if (unlikely((txreq.offset + txreq.size) > XEN_PAGE_SIZE)) { |
e9ce7cb6 | 1455 | netdev_err(queue->vif->dev, |
68946159 | 1456 | "txreq.offset: %u, size: %u, end: %lu\n", |
f942dc25 | 1457 | txreq.offset, txreq.size, |
d0089e8a | 1458 | (unsigned long)(txreq.offset&~XEN_PAGE_MASK) + txreq.size); |
e9ce7cb6 | 1459 | xenvif_fatal_tx_err(queue->vif); |
b3f980bd | 1460 | break; |
f942dc25 IC |
1461 | } |
1462 | ||
e9ce7cb6 WL |
1463 | index = pending_index(queue->pending_cons); |
1464 | pending_idx = queue->pending_ring[index]; | |
f942dc25 | 1465 | |
7e5d7753 | 1466 | data_len = (txreq.size > XEN_NETBACK_TX_COPY_LEN && |
37641494 | 1467 | ret < XEN_NETBK_LEGACY_SLOTS_MAX) ? |
7e5d7753 | 1468 | XEN_NETBACK_TX_COPY_LEN : txreq.size; |
f942dc25 | 1469 | |
e3377f36 | 1470 | skb = xenvif_alloc_skb(data_len); |
f942dc25 | 1471 | if (unlikely(skb == NULL)) { |
e9ce7cb6 | 1472 | netdev_dbg(queue->vif->dev, |
f942dc25 | 1473 | "Can't allocate a skb in start_xmit.\n"); |
562abd39 | 1474 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
f942dc25 IC |
1475 | break; |
1476 | } | |
1477 | ||
2475b225 RL |
1478 | skb_shinfo(skb)->nr_frags = ret; |
1479 | if (data_len < txreq.size) | |
1480 | skb_shinfo(skb)->nr_frags++; | |
1481 | /* At this point shinfo->nr_frags is in fact the number of | |
1482 | * slots, which can be as large as XEN_NETBK_LEGACY_SLOTS_MAX. | |
1483 | */ | |
1484 | frag_overflow = 0; | |
1485 | nskb = NULL; | |
1486 | if (skb_shinfo(skb)->nr_frags > MAX_SKB_FRAGS) { | |
1487 | frag_overflow = skb_shinfo(skb)->nr_frags - MAX_SKB_FRAGS; | |
1488 | BUG_ON(frag_overflow > MAX_SKB_FRAGS); | |
1489 | skb_shinfo(skb)->nr_frags = MAX_SKB_FRAGS; | |
1490 | nskb = xenvif_alloc_skb(0); | |
1491 | if (unlikely(nskb == NULL)) { | |
1492 | kfree_skb(skb); | |
562abd39 | 1493 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
2475b225 RL |
1494 | if (net_ratelimit()) |
1495 | netdev_err(queue->vif->dev, | |
1496 | "Can't allocate the frag_list skb.\n"); | |
1497 | break; | |
1498 | } | |
1499 | } | |
1500 | ||
f942dc25 IC |
1501 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
1502 | struct xen_netif_extra_info *gso; | |
1503 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
1504 | ||
e9ce7cb6 | 1505 | if (xenvif_set_skb_gso(queue->vif, skb, gso)) { |
7376419a | 1506 | /* Failure in xenvif_set_skb_gso is fatal. */ |
f942dc25 | 1507 | kfree_skb(skb); |
2475b225 | 1508 | kfree_skb(nskb); |
b3f980bd | 1509 | break; |
f942dc25 IC |
1510 | } |
1511 | } | |
1512 | ||
c2d09fde PD |
1513 | if (extras[XEN_NETIF_EXTRA_TYPE_HASH - 1].type) { |
1514 | struct xen_netif_extra_info *extra; | |
1515 | enum pkt_hash_types type = PKT_HASH_TYPE_NONE; | |
1516 | ||
1517 | extra = &extras[XEN_NETIF_EXTRA_TYPE_HASH - 1]; | |
1518 | ||
1519 | switch (extra->u.hash.type) { | |
1520 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV4: | |
1521 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV6: | |
1522 | type = PKT_HASH_TYPE_L3; | |
1523 | break; | |
1524 | ||
1525 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP: | |
1526 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP: | |
1527 | type = PKT_HASH_TYPE_L4; | |
1528 | break; | |
1529 | ||
1530 | default: | |
1531 | break; | |
1532 | } | |
1533 | ||
1534 | if (type != PKT_HASH_TYPE_NONE) | |
1535 | skb_set_hash(skb, | |
1536 | *(u32 *)extra->u.hash.value, | |
1537 | type); | |
1538 | } | |
1539 | ||
8f13dd96 | 1540 | XENVIF_TX_CB(skb)->pending_idx = pending_idx; |
f942dc25 IC |
1541 | |
1542 | __skb_put(skb, data_len); | |
e9ce7cb6 WL |
1543 | queue->tx_copy_ops[*copy_ops].source.u.ref = txreq.gref; |
1544 | queue->tx_copy_ops[*copy_ops].source.domid = queue->vif->domid; | |
1545 | queue->tx_copy_ops[*copy_ops].source.offset = txreq.offset; | |
bdab8275 | 1546 | |
e9ce7cb6 | 1547 | queue->tx_copy_ops[*copy_ops].dest.u.gmfn = |
0df4f266 | 1548 | virt_to_gfn(skb->data); |
e9ce7cb6 WL |
1549 | queue->tx_copy_ops[*copy_ops].dest.domid = DOMID_SELF; |
1550 | queue->tx_copy_ops[*copy_ops].dest.offset = | |
d0089e8a | 1551 | offset_in_page(skb->data) & ~XEN_PAGE_MASK; |
bdab8275 | 1552 | |
e9ce7cb6 WL |
1553 | queue->tx_copy_ops[*copy_ops].len = data_len; |
1554 | queue->tx_copy_ops[*copy_ops].flags = GNTCOPY_source_gref; | |
bdab8275 ZK |
1555 | |
1556 | (*copy_ops)++; | |
f942dc25 | 1557 | |
f942dc25 | 1558 | if (data_len < txreq.size) { |
ea066ad1 IC |
1559 | frag_set_pending_idx(&skb_shinfo(skb)->frags[0], |
1560 | pending_idx); | |
562abd39 PD |
1561 | xenvif_tx_create_map_op(queue, pending_idx, &txreq, |
1562 | extra_count, gop); | |
bdab8275 | 1563 | gop++; |
f942dc25 | 1564 | } else { |
ea066ad1 IC |
1565 | frag_set_pending_idx(&skb_shinfo(skb)->frags[0], |
1566 | INVALID_PENDING_IDX); | |
562abd39 PD |
1567 | memcpy(&queue->pending_tx_info[pending_idx].req, |
1568 | &txreq, sizeof(txreq)); | |
1569 | queue->pending_tx_info[pending_idx].extra_count = | |
1570 | extra_count; | |
f942dc25 IC |
1571 | } |
1572 | ||
e9ce7cb6 | 1573 | queue->pending_cons++; |
f942dc25 | 1574 | |
2475b225 RL |
1575 | gop = xenvif_get_requests(queue, skb, txfrags, gop, |
1576 | frag_overflow, nskb); | |
f942dc25 | 1577 | |
e9ce7cb6 | 1578 | __skb_queue_tail(&queue->tx_queue, skb); |
1e0b6eac | 1579 | |
e9ce7cb6 | 1580 | queue->tx.req_cons = idx; |
f942dc25 | 1581 | |
e9ce7cb6 WL |
1582 | if (((gop-queue->tx_map_ops) >= ARRAY_SIZE(queue->tx_map_ops)) || |
1583 | (*copy_ops >= ARRAY_SIZE(queue->tx_copy_ops))) | |
f942dc25 IC |
1584 | break; |
1585 | } | |
1586 | ||
e9ce7cb6 | 1587 | (*map_ops) = gop - queue->tx_map_ops; |
bdab8275 | 1588 | return; |
f942dc25 IC |
1589 | } |
1590 | ||
e3377f36 ZK |
1591 | /* Consolidate skb with a frag_list into a brand new one with local pages on |
1592 | * frags. Returns 0 or -ENOMEM if can't allocate new pages. | |
1593 | */ | |
e9ce7cb6 | 1594 | static int xenvif_handle_frag_list(struct xenvif_queue *queue, struct sk_buff *skb) |
e3377f36 ZK |
1595 | { |
1596 | unsigned int offset = skb_headlen(skb); | |
1597 | skb_frag_t frags[MAX_SKB_FRAGS]; | |
49d9991a | 1598 | int i, f; |
e3377f36 ZK |
1599 | struct ubuf_info *uarg; |
1600 | struct sk_buff *nskb = skb_shinfo(skb)->frag_list; | |
1601 | ||
e9ce7cb6 WL |
1602 | queue->stats.tx_zerocopy_sent += 2; |
1603 | queue->stats.tx_frag_overflow++; | |
e3377f36 | 1604 | |
e9ce7cb6 | 1605 | xenvif_fill_frags(queue, nskb); |
e3377f36 ZK |
1606 | /* Subtract frags size, we will correct it later */ |
1607 | skb->truesize -= skb->data_len; | |
1608 | skb->len += nskb->len; | |
1609 | skb->data_len += nskb->len; | |
1610 | ||
1611 | /* create a brand new frags array and coalesce there */ | |
1612 | for (i = 0; offset < skb->len; i++) { | |
1613 | struct page *page; | |
1614 | unsigned int len; | |
1615 | ||
1616 | BUG_ON(i >= MAX_SKB_FRAGS); | |
44cc8ed1 | 1617 | page = alloc_page(GFP_ATOMIC); |
e3377f36 ZK |
1618 | if (!page) { |
1619 | int j; | |
1620 | skb->truesize += skb->data_len; | |
1621 | for (j = 0; j < i; j++) | |
1622 | put_page(frags[j].page.p); | |
1623 | return -ENOMEM; | |
1624 | } | |
1625 | ||
1626 | if (offset + PAGE_SIZE < skb->len) | |
1627 | len = PAGE_SIZE; | |
1628 | else | |
1629 | len = skb->len - offset; | |
1630 | if (skb_copy_bits(skb, offset, page_address(page), len)) | |
1631 | BUG(); | |
1632 | ||
1633 | offset += len; | |
1634 | frags[i].page.p = page; | |
1635 | frags[i].page_offset = 0; | |
1636 | skb_frag_size_set(&frags[i], len); | |
1637 | } | |
49d9991a | 1638 | |
b0c21bad DV |
1639 | /* Copied all the bits from the frag list -- free it. */ |
1640 | skb_frag_list_init(skb); | |
1641 | xenvif_skb_zerocopy_prepare(queue, nskb); | |
1642 | kfree_skb(nskb); | |
1643 | ||
49d9991a DV |
1644 | /* Release all the original (foreign) frags. */ |
1645 | for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) | |
1646 | skb_frag_unref(skb, f); | |
e3377f36 | 1647 | uarg = skb_shinfo(skb)->destructor_arg; |
a64bd934 WL |
1648 | /* increase inflight counter to offset decrement in callback */ |
1649 | atomic_inc(&queue->inflight_packets); | |
e3377f36 ZK |
1650 | uarg->callback(uarg, true); |
1651 | skb_shinfo(skb)->destructor_arg = NULL; | |
1652 | ||
b0c21bad DV |
1653 | /* Fill the skb with the new (local) frags. */ |
1654 | memcpy(skb_shinfo(skb)->frags, frags, i * sizeof(skb_frag_t)); | |
1655 | skb_shinfo(skb)->nr_frags = i; | |
1656 | skb->truesize += i * PAGE_SIZE; | |
e3377f36 ZK |
1657 | |
1658 | return 0; | |
1659 | } | |
b3f980bd | 1660 | |
e9ce7cb6 | 1661 | static int xenvif_tx_submit(struct xenvif_queue *queue) |
f942dc25 | 1662 | { |
e9ce7cb6 WL |
1663 | struct gnttab_map_grant_ref *gop_map = queue->tx_map_ops; |
1664 | struct gnttab_copy *gop_copy = queue->tx_copy_ops; | |
f942dc25 | 1665 | struct sk_buff *skb; |
b3f980bd | 1666 | int work_done = 0; |
f942dc25 | 1667 | |
e9ce7cb6 | 1668 | while ((skb = __skb_dequeue(&queue->tx_queue)) != NULL) { |
f942dc25 | 1669 | struct xen_netif_tx_request *txp; |
f942dc25 IC |
1670 | u16 pending_idx; |
1671 | unsigned data_len; | |
1672 | ||
8f13dd96 | 1673 | pending_idx = XENVIF_TX_CB(skb)->pending_idx; |
e9ce7cb6 | 1674 | txp = &queue->pending_tx_info[pending_idx].req; |
f942dc25 IC |
1675 | |
1676 | /* Check the remap error code. */ | |
e9ce7cb6 | 1677 | if (unlikely(xenvif_tx_check_gop(queue, skb, &gop_map, &gop_copy))) { |
b42cc6e4 ZK |
1678 | /* If there was an error, xenvif_tx_check_gop is |
1679 | * expected to release all the frags which were mapped, | |
1680 | * so kfree_skb shouldn't do it again | |
1681 | */ | |
f942dc25 | 1682 | skb_shinfo(skb)->nr_frags = 0; |
b42cc6e4 ZK |
1683 | if (skb_has_frag_list(skb)) { |
1684 | struct sk_buff *nskb = | |
1685 | skb_shinfo(skb)->frag_list; | |
1686 | skb_shinfo(nskb)->nr_frags = 0; | |
1687 | } | |
f942dc25 IC |
1688 | kfree_skb(skb); |
1689 | continue; | |
1690 | } | |
1691 | ||
1692 | data_len = skb->len; | |
e9ce7cb6 | 1693 | callback_param(queue, pending_idx).ctx = NULL; |
f942dc25 IC |
1694 | if (data_len < txp->size) { |
1695 | /* Append the packet payload as a fragment. */ | |
1696 | txp->offset += data_len; | |
1697 | txp->size -= data_len; | |
1698 | } else { | |
1699 | /* Schedule a response immediately. */ | |
e9ce7cb6 | 1700 | xenvif_idx_release(queue, pending_idx, |
bdab8275 | 1701 | XEN_NETIF_RSP_OKAY); |
f942dc25 IC |
1702 | } |
1703 | ||
1704 | if (txp->flags & XEN_NETTXF_csum_blank) | |
1705 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1706 | else if (txp->flags & XEN_NETTXF_data_validated) | |
1707 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1708 | ||
e9ce7cb6 | 1709 | xenvif_fill_frags(queue, skb); |
f942dc25 | 1710 | |
e3377f36 | 1711 | if (unlikely(skb_has_frag_list(skb))) { |
e9ce7cb6 | 1712 | if (xenvif_handle_frag_list(queue, skb)) { |
e3377f36 | 1713 | if (net_ratelimit()) |
e9ce7cb6 | 1714 | netdev_err(queue->vif->dev, |
e3377f36 | 1715 | "Not enough memory to consolidate frag_list!\n"); |
a64bd934 | 1716 | xenvif_skb_zerocopy_prepare(queue, skb); |
e3377f36 ZK |
1717 | kfree_skb(skb); |
1718 | continue; | |
1719 | } | |
1720 | } | |
1721 | ||
e9ce7cb6 | 1722 | skb->dev = queue->vif->dev; |
f942dc25 | 1723 | skb->protocol = eth_type_trans(skb, skb->dev); |
f9ca8f74 | 1724 | skb_reset_network_header(skb); |
f942dc25 | 1725 | |
e9ce7cb6 WL |
1726 | if (checksum_setup(queue, skb)) { |
1727 | netdev_dbg(queue->vif->dev, | |
f942dc25 | 1728 | "Can't setup checksum in net_tx_action\n"); |
f53c3fe8 ZK |
1729 | /* We have to set this flag to trigger the callback */ |
1730 | if (skb_shinfo(skb)->destructor_arg) | |
a64bd934 | 1731 | xenvif_skb_zerocopy_prepare(queue, skb); |
f942dc25 IC |
1732 | kfree_skb(skb); |
1733 | continue; | |
1734 | } | |
1735 | ||
40893fd0 | 1736 | skb_probe_transport_header(skb, 0); |
f9ca8f74 | 1737 | |
b89587a7 PD |
1738 | /* If the packet is GSO then we will have just set up the |
1739 | * transport header offset in checksum_setup so it's now | |
1740 | * straightforward to calculate gso_segs. | |
1741 | */ | |
1742 | if (skb_is_gso(skb)) { | |
1743 | int mss = skb_shinfo(skb)->gso_size; | |
1744 | int hdrlen = skb_transport_header(skb) - | |
1745 | skb_mac_header(skb) + | |
1746 | tcp_hdrlen(skb); | |
1747 | ||
1748 | skb_shinfo(skb)->gso_segs = | |
1749 | DIV_ROUND_UP(skb->len - hdrlen, mss); | |
1750 | } | |
1751 | ||
e9ce7cb6 WL |
1752 | queue->stats.rx_bytes += skb->len; |
1753 | queue->stats.rx_packets++; | |
f942dc25 | 1754 | |
b3f980bd WL |
1755 | work_done++; |
1756 | ||
f53c3fe8 ZK |
1757 | /* Set this flag right before netif_receive_skb, otherwise |
1758 | * someone might think this packet already left netback, and | |
1759 | * do a skb_copy_ubufs while we are still in control of the | |
1760 | * skb. E.g. the __pskb_pull_tail earlier can do such thing. | |
1761 | */ | |
1bb332af | 1762 | if (skb_shinfo(skb)->destructor_arg) { |
a64bd934 | 1763 | xenvif_skb_zerocopy_prepare(queue, skb); |
e9ce7cb6 | 1764 | queue->stats.tx_zerocopy_sent++; |
1bb332af | 1765 | } |
f53c3fe8 | 1766 | |
b3f980bd | 1767 | netif_receive_skb(skb); |
f942dc25 | 1768 | } |
b3f980bd WL |
1769 | |
1770 | return work_done; | |
f942dc25 IC |
1771 | } |
1772 | ||
3e2234b3 ZK |
1773 | void xenvif_zerocopy_callback(struct ubuf_info *ubuf, bool zerocopy_success) |
1774 | { | |
f53c3fe8 ZK |
1775 | unsigned long flags; |
1776 | pending_ring_idx_t index; | |
e9ce7cb6 | 1777 | struct xenvif_queue *queue = ubuf_to_queue(ubuf); |
f53c3fe8 ZK |
1778 | |
1779 | /* This is the only place where we grab this lock, to protect callbacks | |
1780 | * from each other. | |
1781 | */ | |
e9ce7cb6 | 1782 | spin_lock_irqsave(&queue->callback_lock, flags); |
f53c3fe8 ZK |
1783 | do { |
1784 | u16 pending_idx = ubuf->desc; | |
1785 | ubuf = (struct ubuf_info *) ubuf->ctx; | |
e9ce7cb6 | 1786 | BUG_ON(queue->dealloc_prod - queue->dealloc_cons >= |
f53c3fe8 | 1787 | MAX_PENDING_REQS); |
e9ce7cb6 WL |
1788 | index = pending_index(queue->dealloc_prod); |
1789 | queue->dealloc_ring[index] = pending_idx; | |
f53c3fe8 ZK |
1790 | /* Sync with xenvif_tx_dealloc_action: |
1791 | * insert idx then incr producer. | |
1792 | */ | |
1793 | smp_wmb(); | |
e9ce7cb6 | 1794 | queue->dealloc_prod++; |
f53c3fe8 | 1795 | } while (ubuf); |
e9ce7cb6 | 1796 | spin_unlock_irqrestore(&queue->callback_lock, flags); |
f53c3fe8 | 1797 | |
1bb332af | 1798 | if (likely(zerocopy_success)) |
e9ce7cb6 | 1799 | queue->stats.tx_zerocopy_success++; |
1bb332af | 1800 | else |
e9ce7cb6 | 1801 | queue->stats.tx_zerocopy_fail++; |
a64bd934 | 1802 | xenvif_skb_zerocopy_complete(queue); |
f53c3fe8 ZK |
1803 | } |
1804 | ||
e9ce7cb6 | 1805 | static inline void xenvif_tx_dealloc_action(struct xenvif_queue *queue) |
f53c3fe8 ZK |
1806 | { |
1807 | struct gnttab_unmap_grant_ref *gop; | |
1808 | pending_ring_idx_t dc, dp; | |
1809 | u16 pending_idx, pending_idx_release[MAX_PENDING_REQS]; | |
1810 | unsigned int i = 0; | |
1811 | ||
e9ce7cb6 WL |
1812 | dc = queue->dealloc_cons; |
1813 | gop = queue->tx_unmap_ops; | |
f53c3fe8 ZK |
1814 | |
1815 | /* Free up any grants we have finished using */ | |
1816 | do { | |
e9ce7cb6 | 1817 | dp = queue->dealloc_prod; |
f53c3fe8 ZK |
1818 | |
1819 | /* Ensure we see all indices enqueued by all | |
1820 | * xenvif_zerocopy_callback(). | |
1821 | */ | |
1822 | smp_rmb(); | |
1823 | ||
1824 | while (dc != dp) { | |
50c2e4dd | 1825 | BUG_ON(gop - queue->tx_unmap_ops >= MAX_PENDING_REQS); |
f53c3fe8 | 1826 | pending_idx = |
e9ce7cb6 | 1827 | queue->dealloc_ring[pending_index(dc++)]; |
f53c3fe8 | 1828 | |
50c2e4dd | 1829 | pending_idx_release[gop - queue->tx_unmap_ops] = |
f53c3fe8 | 1830 | pending_idx; |
50c2e4dd | 1831 | queue->pages_to_unmap[gop - queue->tx_unmap_ops] = |
e9ce7cb6 | 1832 | queue->mmap_pages[pending_idx]; |
f53c3fe8 | 1833 | gnttab_set_unmap_op(gop, |
e9ce7cb6 | 1834 | idx_to_kaddr(queue, pending_idx), |
f53c3fe8 | 1835 | GNTMAP_host_map, |
e9ce7cb6 WL |
1836 | queue->grant_tx_handle[pending_idx]); |
1837 | xenvif_grant_handle_reset(queue, pending_idx); | |
f53c3fe8 ZK |
1838 | ++gop; |
1839 | } | |
1840 | ||
e9ce7cb6 | 1841 | } while (dp != queue->dealloc_prod); |
f53c3fe8 | 1842 | |
e9ce7cb6 | 1843 | queue->dealloc_cons = dc; |
f53c3fe8 | 1844 | |
e9ce7cb6 | 1845 | if (gop - queue->tx_unmap_ops > 0) { |
f53c3fe8 | 1846 | int ret; |
e9ce7cb6 | 1847 | ret = gnttab_unmap_refs(queue->tx_unmap_ops, |
f53c3fe8 | 1848 | NULL, |
e9ce7cb6 WL |
1849 | queue->pages_to_unmap, |
1850 | gop - queue->tx_unmap_ops); | |
f53c3fe8 | 1851 | if (ret) { |
68946159 | 1852 | netdev_err(queue->vif->dev, "Unmap fail: nr_ops %tu ret %d\n", |
e9ce7cb6 WL |
1853 | gop - queue->tx_unmap_ops, ret); |
1854 | for (i = 0; i < gop - queue->tx_unmap_ops; ++i) { | |
f53c3fe8 | 1855 | if (gop[i].status != GNTST_okay) |
e9ce7cb6 | 1856 | netdev_err(queue->vif->dev, |
68946159 | 1857 | " host_addr: 0x%llx handle: 0x%x status: %d\n", |
f53c3fe8 ZK |
1858 | gop[i].host_addr, |
1859 | gop[i].handle, | |
1860 | gop[i].status); | |
1861 | } | |
1862 | BUG(); | |
1863 | } | |
1864 | } | |
1865 | ||
e9ce7cb6 WL |
1866 | for (i = 0; i < gop - queue->tx_unmap_ops; ++i) |
1867 | xenvif_idx_release(queue, pending_idx_release[i], | |
f53c3fe8 | 1868 | XEN_NETIF_RSP_OKAY); |
3e2234b3 ZK |
1869 | } |
1870 | ||
f53c3fe8 | 1871 | |
f942dc25 | 1872 | /* Called after netfront has transmitted */ |
e9ce7cb6 | 1873 | int xenvif_tx_action(struct xenvif_queue *queue, int budget) |
f942dc25 | 1874 | { |
bdab8275 | 1875 | unsigned nr_mops, nr_cops = 0; |
f53c3fe8 | 1876 | int work_done, ret; |
f942dc25 | 1877 | |
e9ce7cb6 | 1878 | if (unlikely(!tx_work_todo(queue))) |
b3f980bd WL |
1879 | return 0; |
1880 | ||
e9ce7cb6 | 1881 | xenvif_tx_build_gops(queue, budget, &nr_cops, &nr_mops); |
f942dc25 | 1882 | |
bdab8275 | 1883 | if (nr_cops == 0) |
b3f980bd WL |
1884 | return 0; |
1885 | ||
e9ce7cb6 | 1886 | gnttab_batch_copy(queue->tx_copy_ops, nr_cops); |
bdab8275 | 1887 | if (nr_mops != 0) { |
e9ce7cb6 | 1888 | ret = gnttab_map_refs(queue->tx_map_ops, |
bdab8275 | 1889 | NULL, |
e9ce7cb6 | 1890 | queue->pages_to_map, |
bdab8275 ZK |
1891 | nr_mops); |
1892 | BUG_ON(ret); | |
1893 | } | |
f942dc25 | 1894 | |
e9ce7cb6 | 1895 | work_done = xenvif_tx_submit(queue); |
f942dc25 | 1896 | |
b3f980bd | 1897 | return work_done; |
f942dc25 IC |
1898 | } |
1899 | ||
e9ce7cb6 | 1900 | static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx, |
7376419a | 1901 | u8 status) |
f942dc25 | 1902 | { |
f942dc25 | 1903 | struct pending_tx_info *pending_tx_info; |
f53c3fe8 | 1904 | pending_ring_idx_t index; |
f53c3fe8 | 1905 | unsigned long flags; |
2810e5b9 | 1906 | |
e9ce7cb6 | 1907 | pending_tx_info = &queue->pending_tx_info[pending_idx]; |
7fbb9d84 | 1908 | |
e9ce7cb6 | 1909 | spin_lock_irqsave(&queue->response_lock, flags); |
7fbb9d84 | 1910 | |
562abd39 PD |
1911 | make_tx_response(queue, &pending_tx_info->req, |
1912 | pending_tx_info->extra_count, status); | |
7fbb9d84 DV |
1913 | |
1914 | /* Release the pending index before pusing the Tx response so | |
1915 | * its available before a new Tx request is pushed by the | |
1916 | * frontend. | |
1917 | */ | |
1918 | index = pending_index(queue->pending_prod++); | |
e9ce7cb6 | 1919 | queue->pending_ring[index] = pending_idx; |
7fbb9d84 | 1920 | |
c8a4d299 | 1921 | push_tx_responses(queue); |
7fbb9d84 | 1922 | |
e9ce7cb6 | 1923 | spin_unlock_irqrestore(&queue->response_lock, flags); |
f942dc25 IC |
1924 | } |
1925 | ||
2810e5b9 | 1926 | |
e9ce7cb6 | 1927 | static void make_tx_response(struct xenvif_queue *queue, |
f942dc25 | 1928 | struct xen_netif_tx_request *txp, |
562abd39 | 1929 | unsigned int extra_count, |
f942dc25 IC |
1930 | s8 st) |
1931 | { | |
e9ce7cb6 | 1932 | RING_IDX i = queue->tx.rsp_prod_pvt; |
f942dc25 | 1933 | struct xen_netif_tx_response *resp; |
f942dc25 | 1934 | |
e9ce7cb6 | 1935 | resp = RING_GET_RESPONSE(&queue->tx, i); |
f942dc25 IC |
1936 | resp->id = txp->id; |
1937 | resp->status = st; | |
1938 | ||
562abd39 | 1939 | while (extra_count-- != 0) |
e9ce7cb6 | 1940 | RING_GET_RESPONSE(&queue->tx, ++i)->status = XEN_NETIF_RSP_NULL; |
f942dc25 | 1941 | |
e9ce7cb6 | 1942 | queue->tx.rsp_prod_pvt = ++i; |
f942dc25 IC |
1943 | } |
1944 | ||
c8a4d299 DV |
1945 | static void push_tx_responses(struct xenvif_queue *queue) |
1946 | { | |
1947 | int notify; | |
1948 | ||
1949 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->tx, notify); | |
1950 | if (notify) | |
1951 | notify_remote_via_irq(queue->tx_irq); | |
1952 | } | |
1953 | ||
e9ce7cb6 | 1954 | static struct xen_netif_rx_response *make_rx_response(struct xenvif_queue *queue, |
f942dc25 IC |
1955 | u16 id, |
1956 | s8 st, | |
1957 | u16 offset, | |
1958 | u16 size, | |
1959 | u16 flags) | |
1960 | { | |
e9ce7cb6 | 1961 | RING_IDX i = queue->rx.rsp_prod_pvt; |
f942dc25 IC |
1962 | struct xen_netif_rx_response *resp; |
1963 | ||
e9ce7cb6 | 1964 | resp = RING_GET_RESPONSE(&queue->rx, i); |
f942dc25 IC |
1965 | resp->offset = offset; |
1966 | resp->flags = flags; | |
1967 | resp->id = id; | |
1968 | resp->status = (s16)size; | |
1969 | if (st < 0) | |
1970 | resp->status = (s16)st; | |
1971 | ||
e9ce7cb6 | 1972 | queue->rx.rsp_prod_pvt = ++i; |
f942dc25 IC |
1973 | |
1974 | return resp; | |
1975 | } | |
1976 | ||
e9ce7cb6 | 1977 | void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx) |
f53c3fe8 ZK |
1978 | { |
1979 | int ret; | |
1980 | struct gnttab_unmap_grant_ref tx_unmap_op; | |
1981 | ||
1982 | gnttab_set_unmap_op(&tx_unmap_op, | |
e9ce7cb6 | 1983 | idx_to_kaddr(queue, pending_idx), |
f53c3fe8 | 1984 | GNTMAP_host_map, |
e9ce7cb6 WL |
1985 | queue->grant_tx_handle[pending_idx]); |
1986 | xenvif_grant_handle_reset(queue, pending_idx); | |
f53c3fe8 ZK |
1987 | |
1988 | ret = gnttab_unmap_refs(&tx_unmap_op, NULL, | |
e9ce7cb6 | 1989 | &queue->mmap_pages[pending_idx], 1); |
7aceb47a | 1990 | if (ret) { |
e9ce7cb6 | 1991 | netdev_err(queue->vif->dev, |
68946159 | 1992 | "Unmap fail: ret: %d pending_idx: %d host_addr: %llx handle: 0x%x status: %d\n", |
7aceb47a ZK |
1993 | ret, |
1994 | pending_idx, | |
1995 | tx_unmap_op.host_addr, | |
1996 | tx_unmap_op.handle, | |
1997 | tx_unmap_op.status); | |
1998 | BUG(); | |
1999 | } | |
f53c3fe8 ZK |
2000 | } |
2001 | ||
e9ce7cb6 | 2002 | static inline int tx_work_todo(struct xenvif_queue *queue) |
f942dc25 | 2003 | { |
e9ce7cb6 | 2004 | if (likely(RING_HAS_UNCONSUMED_REQUESTS(&queue->tx))) |
f942dc25 IC |
2005 | return 1; |
2006 | ||
2007 | return 0; | |
2008 | } | |
2009 | ||
e9ce7cb6 | 2010 | static inline bool tx_dealloc_work_todo(struct xenvif_queue *queue) |
f53c3fe8 | 2011 | { |
e9ce7cb6 | 2012 | return queue->dealloc_cons != queue->dealloc_prod; |
f53c3fe8 ZK |
2013 | } |
2014 | ||
4e15ee2c | 2015 | void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue) |
f942dc25 | 2016 | { |
e9ce7cb6 WL |
2017 | if (queue->tx.sring) |
2018 | xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif), | |
2019 | queue->tx.sring); | |
2020 | if (queue->rx.sring) | |
2021 | xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif), | |
2022 | queue->rx.sring); | |
f942dc25 IC |
2023 | } |
2024 | ||
4e15ee2c PD |
2025 | int xenvif_map_frontend_data_rings(struct xenvif_queue *queue, |
2026 | grant_ref_t tx_ring_ref, | |
2027 | grant_ref_t rx_ring_ref) | |
f942dc25 | 2028 | { |
c9d63699 | 2029 | void *addr; |
f942dc25 IC |
2030 | struct xen_netif_tx_sring *txs; |
2031 | struct xen_netif_rx_sring *rxs; | |
2032 | ||
2033 | int err = -ENOMEM; | |
2034 | ||
e9ce7cb6 | 2035 | err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif), |
ccc9d90a | 2036 | &tx_ring_ref, 1, &addr); |
c9d63699 | 2037 | if (err) |
f942dc25 IC |
2038 | goto err; |
2039 | ||
c9d63699 | 2040 | txs = (struct xen_netif_tx_sring *)addr; |
d0089e8a | 2041 | BACK_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); |
f942dc25 | 2042 | |
e9ce7cb6 | 2043 | err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif), |
ccc9d90a | 2044 | &rx_ring_ref, 1, &addr); |
c9d63699 | 2045 | if (err) |
f942dc25 | 2046 | goto err; |
f942dc25 | 2047 | |
c9d63699 | 2048 | rxs = (struct xen_netif_rx_sring *)addr; |
d0089e8a | 2049 | BACK_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); |
f942dc25 IC |
2050 | |
2051 | return 0; | |
2052 | ||
2053 | err: | |
4e15ee2c | 2054 | xenvif_unmap_frontend_data_rings(queue); |
f942dc25 IC |
2055 | return err; |
2056 | } | |
2057 | ||
ecf08d2d | 2058 | static void xenvif_queue_carrier_off(struct xenvif_queue *queue) |
ca2f09f2 | 2059 | { |
ecf08d2d DV |
2060 | struct xenvif *vif = queue->vif; |
2061 | ||
2062 | queue->stalled = true; | |
2063 | ||
2064 | /* At least one queue has stalled? Disable the carrier. */ | |
2065 | spin_lock(&vif->lock); | |
2066 | if (vif->stalled_queues++ == 0) { | |
2067 | netdev_info(vif->dev, "Guest Rx stalled"); | |
2068 | netif_carrier_off(vif->dev); | |
2069 | } | |
2070 | spin_unlock(&vif->lock); | |
ca2f09f2 PD |
2071 | } |
2072 | ||
ecf08d2d | 2073 | static void xenvif_queue_carrier_on(struct xenvif_queue *queue) |
f34a4cf9 | 2074 | { |
ecf08d2d | 2075 | struct xenvif *vif = queue->vif; |
f34a4cf9 | 2076 | |
ecf08d2d DV |
2077 | queue->last_rx_time = jiffies; /* Reset Rx stall detection. */ |
2078 | queue->stalled = false; | |
f34a4cf9 | 2079 | |
ecf08d2d DV |
2080 | /* All queues are ready? Enable the carrier. */ |
2081 | spin_lock(&vif->lock); | |
2082 | if (--vif->stalled_queues == 0) { | |
2083 | netdev_info(vif->dev, "Guest Rx ready"); | |
2084 | netif_carrier_on(vif->dev); | |
2085 | } | |
2086 | spin_unlock(&vif->lock); | |
2087 | } | |
f34a4cf9 | 2088 | |
ecf08d2d DV |
2089 | static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue) |
2090 | { | |
2091 | RING_IDX prod, cons; | |
2092 | ||
2093 | prod = queue->rx.sring->req_prod; | |
2094 | cons = queue->rx.req_cons; | |
2095 | ||
1d5d4852 | 2096 | return !queue->stalled && prod - cons < 1 |
ecf08d2d | 2097 | && time_after(jiffies, |
26c0e102 | 2098 | queue->last_rx_time + queue->vif->stall_timeout); |
ecf08d2d DV |
2099 | } |
2100 | ||
2101 | static bool xenvif_rx_queue_ready(struct xenvif_queue *queue) | |
2102 | { | |
2103 | RING_IDX prod, cons; | |
2104 | ||
2105 | prod = queue->rx.sring->req_prod; | |
2106 | cons = queue->rx.req_cons; | |
2107 | ||
1d5d4852 | 2108 | return queue->stalled && prod - cons >= 1; |
ecf08d2d DV |
2109 | } |
2110 | ||
f48da8b1 | 2111 | static bool xenvif_have_rx_work(struct xenvif_queue *queue) |
ca2f09f2 | 2112 | { |
99a2dea5 | 2113 | return xenvif_rx_ring_slots_available(queue) |
26c0e102 DV |
2114 | || (queue->vif->stall_timeout && |
2115 | (xenvif_rx_queue_stalled(queue) | |
2116 | || xenvif_rx_queue_ready(queue))) | |
f48da8b1 DV |
2117 | || kthread_should_stop() |
2118 | || queue->vif->disabled; | |
ca2f09f2 PD |
2119 | } |
2120 | ||
f48da8b1 | 2121 | static long xenvif_rx_queue_timeout(struct xenvif_queue *queue) |
f34a4cf9 | 2122 | { |
f48da8b1 DV |
2123 | struct sk_buff *skb; |
2124 | long timeout; | |
f34a4cf9 | 2125 | |
f48da8b1 DV |
2126 | skb = skb_peek(&queue->rx_queue); |
2127 | if (!skb) | |
2128 | return MAX_SCHEDULE_TIMEOUT; | |
f34a4cf9 | 2129 | |
f48da8b1 DV |
2130 | timeout = XENVIF_RX_CB(skb)->expires - jiffies; |
2131 | return timeout < 0 ? 0 : timeout; | |
2132 | } | |
f34a4cf9 | 2133 | |
f48da8b1 DV |
2134 | /* Wait until the guest Rx thread has work. |
2135 | * | |
2136 | * The timeout needs to be adjusted based on the current head of the | |
2137 | * queue (and not just the head at the beginning). In particular, if | |
2138 | * the queue is initially empty an infinite timeout is used and this | |
2139 | * needs to be reduced when a skb is queued. | |
2140 | * | |
2141 | * This cannot be done with wait_event_timeout() because it only | |
2142 | * calculates the timeout once. | |
2143 | */ | |
2144 | static void xenvif_wait_for_rx_work(struct xenvif_queue *queue) | |
2145 | { | |
2146 | DEFINE_WAIT(wait); | |
2147 | ||
2148 | if (xenvif_have_rx_work(queue)) | |
2149 | return; | |
2150 | ||
2151 | for (;;) { | |
2152 | long ret; | |
2153 | ||
2154 | prepare_to_wait(&queue->wq, &wait, TASK_INTERRUPTIBLE); | |
2155 | if (xenvif_have_rx_work(queue)) | |
2156 | break; | |
2157 | ret = schedule_timeout(xenvif_rx_queue_timeout(queue)); | |
2158 | if (!ret) | |
2159 | break; | |
f34a4cf9 | 2160 | } |
f48da8b1 | 2161 | finish_wait(&queue->wq, &wait); |
f34a4cf9 ZK |
2162 | } |
2163 | ||
121fa4b7 | 2164 | int xenvif_kthread_guest_rx(void *data) |
b3f980bd | 2165 | { |
e9ce7cb6 | 2166 | struct xenvif_queue *queue = data; |
f48da8b1 | 2167 | struct xenvif *vif = queue->vif; |
b3f980bd | 2168 | |
26c0e102 DV |
2169 | if (!vif->stall_timeout) |
2170 | xenvif_queue_carrier_on(queue); | |
2171 | ||
f48da8b1 DV |
2172 | for (;;) { |
2173 | xenvif_wait_for_rx_work(queue); | |
e9d8b2c2 | 2174 | |
f34a4cf9 ZK |
2175 | if (kthread_should_stop()) |
2176 | break; | |
2177 | ||
e9d8b2c2 WL |
2178 | /* This frontend is found to be rogue, disable it in |
2179 | * kthread context. Currently this is only set when | |
2180 | * netback finds out frontend sends malformed packet, | |
2181 | * but we cannot disable the interface in softirq | |
e9ce7cb6 WL |
2182 | * context so we defer it here, if this thread is |
2183 | * associated with queue 0. | |
e9d8b2c2 | 2184 | */ |
f48da8b1 DV |
2185 | if (unlikely(vif->disabled && queue->id == 0)) { |
2186 | xenvif_carrier_off(vif); | |
42b5212f | 2187 | break; |
09350788 ZK |
2188 | } |
2189 | ||
e9ce7cb6 WL |
2190 | if (!skb_queue_empty(&queue->rx_queue)) |
2191 | xenvif_rx_action(queue); | |
b3f980bd | 2192 | |
ecf08d2d DV |
2193 | /* If the guest hasn't provided any Rx slots for a |
2194 | * while it's probably not responsive, drop the | |
2195 | * carrier so packets are dropped earlier. | |
2196 | */ | |
26c0e102 DV |
2197 | if (vif->stall_timeout) { |
2198 | if (xenvif_rx_queue_stalled(queue)) | |
2199 | xenvif_queue_carrier_off(queue); | |
2200 | else if (xenvif_rx_queue_ready(queue)) | |
2201 | xenvif_queue_carrier_on(queue); | |
2202 | } | |
ecf08d2d | 2203 | |
f48da8b1 DV |
2204 | /* Queued packets may have foreign pages from other |
2205 | * domains. These cannot be queued indefinitely as | |
2206 | * this would starve guests of grant refs and transmit | |
2207 | * slots. | |
2208 | */ | |
2209 | xenvif_rx_queue_drop_expired(queue); | |
2210 | ||
2211 | xenvif_rx_queue_maybe_wake(queue); | |
2212 | ||
b3f980bd WL |
2213 | cond_resched(); |
2214 | } | |
2215 | ||
ca2f09f2 | 2216 | /* Bin any remaining skbs */ |
f48da8b1 | 2217 | xenvif_rx_queue_purge(queue); |
ca2f09f2 | 2218 | |
b3f980bd WL |
2219 | return 0; |
2220 | } | |
2221 | ||
a64bd934 WL |
2222 | static bool xenvif_dealloc_kthread_should_stop(struct xenvif_queue *queue) |
2223 | { | |
2224 | /* Dealloc thread must remain running until all inflight | |
2225 | * packets complete. | |
2226 | */ | |
2227 | return kthread_should_stop() && | |
2228 | !atomic_read(&queue->inflight_packets); | |
2229 | } | |
2230 | ||
f53c3fe8 ZK |
2231 | int xenvif_dealloc_kthread(void *data) |
2232 | { | |
e9ce7cb6 | 2233 | struct xenvif_queue *queue = data; |
f53c3fe8 | 2234 | |
a64bd934 | 2235 | for (;;) { |
e9ce7cb6 WL |
2236 | wait_event_interruptible(queue->dealloc_wq, |
2237 | tx_dealloc_work_todo(queue) || | |
a64bd934 WL |
2238 | xenvif_dealloc_kthread_should_stop(queue)); |
2239 | if (xenvif_dealloc_kthread_should_stop(queue)) | |
f53c3fe8 ZK |
2240 | break; |
2241 | ||
e9ce7cb6 | 2242 | xenvif_tx_dealloc_action(queue); |
f53c3fe8 ZK |
2243 | cond_resched(); |
2244 | } | |
2245 | ||
2246 | /* Unmap anything remaining*/ | |
e9ce7cb6 WL |
2247 | if (tx_dealloc_work_todo(queue)) |
2248 | xenvif_tx_dealloc_action(queue); | |
f53c3fe8 ZK |
2249 | |
2250 | return 0; | |
2251 | } | |
2252 | ||
4e15ee2c PD |
2253 | static void make_ctrl_response(struct xenvif *vif, |
2254 | const struct xen_netif_ctrl_request *req, | |
2255 | u32 status, u32 data) | |
2256 | { | |
2257 | RING_IDX idx = vif->ctrl.rsp_prod_pvt; | |
2258 | struct xen_netif_ctrl_response rsp = { | |
2259 | .id = req->id, | |
2260 | .type = req->type, | |
2261 | .status = status, | |
2262 | .data = data, | |
2263 | }; | |
2264 | ||
2265 | *RING_GET_RESPONSE(&vif->ctrl, idx) = rsp; | |
2266 | vif->ctrl.rsp_prod_pvt = ++idx; | |
2267 | } | |
2268 | ||
2269 | static void push_ctrl_response(struct xenvif *vif) | |
2270 | { | |
2271 | int notify; | |
2272 | ||
2273 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&vif->ctrl, notify); | |
2274 | if (notify) | |
2275 | notify_remote_via_irq(vif->ctrl_irq); | |
2276 | } | |
2277 | ||
2278 | static void process_ctrl_request(struct xenvif *vif, | |
2279 | const struct xen_netif_ctrl_request *req) | |
2280 | { | |
40d8abde PD |
2281 | u32 status = XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED; |
2282 | u32 data = 0; | |
2283 | ||
2284 | switch (req->type) { | |
2285 | case XEN_NETIF_CTRL_TYPE_SET_HASH_ALGORITHM: | |
2286 | status = xenvif_set_hash_alg(vif, req->data[0]); | |
2287 | break; | |
2288 | ||
2289 | case XEN_NETIF_CTRL_TYPE_GET_HASH_FLAGS: | |
2290 | status = xenvif_get_hash_flags(vif, &data); | |
2291 | break; | |
2292 | ||
2293 | case XEN_NETIF_CTRL_TYPE_SET_HASH_FLAGS: | |
2294 | status = xenvif_set_hash_flags(vif, req->data[0]); | |
2295 | break; | |
2296 | ||
2297 | case XEN_NETIF_CTRL_TYPE_SET_HASH_KEY: | |
2298 | status = xenvif_set_hash_key(vif, req->data[0], | |
2299 | req->data[1]); | |
2300 | break; | |
2301 | ||
2302 | case XEN_NETIF_CTRL_TYPE_GET_HASH_MAPPING_SIZE: | |
2303 | status = XEN_NETIF_CTRL_STATUS_SUCCESS; | |
2304 | data = XEN_NETBK_MAX_HASH_MAPPING_SIZE; | |
2305 | break; | |
2306 | ||
2307 | case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING_SIZE: | |
2308 | status = xenvif_set_hash_mapping_size(vif, | |
2309 | req->data[0]); | |
2310 | break; | |
2311 | ||
2312 | case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING: | |
2313 | status = xenvif_set_hash_mapping(vif, req->data[0], | |
2314 | req->data[1], | |
2315 | req->data[2]); | |
2316 | break; | |
2317 | ||
2318 | default: | |
2319 | break; | |
2320 | } | |
2321 | ||
2322 | make_ctrl_response(vif, req, status, data); | |
4e15ee2c PD |
2323 | push_ctrl_response(vif); |
2324 | } | |
2325 | ||
2326 | static void xenvif_ctrl_action(struct xenvif *vif) | |
2327 | { | |
2328 | for (;;) { | |
2329 | RING_IDX req_prod, req_cons; | |
2330 | ||
2331 | req_prod = vif->ctrl.sring->req_prod; | |
2332 | req_cons = vif->ctrl.req_cons; | |
2333 | ||
2334 | /* Make sure we can see requests before we process them. */ | |
2335 | rmb(); | |
2336 | ||
2337 | if (req_cons == req_prod) | |
2338 | break; | |
2339 | ||
2340 | while (req_cons != req_prod) { | |
2341 | struct xen_netif_ctrl_request req; | |
2342 | ||
2343 | RING_COPY_REQUEST(&vif->ctrl, req_cons, &req); | |
2344 | req_cons++; | |
2345 | ||
2346 | process_ctrl_request(vif, &req); | |
2347 | } | |
2348 | ||
2349 | vif->ctrl.req_cons = req_cons; | |
2350 | vif->ctrl.sring->req_event = req_cons + 1; | |
2351 | } | |
2352 | } | |
2353 | ||
2354 | static bool xenvif_ctrl_work_todo(struct xenvif *vif) | |
2355 | { | |
2356 | if (likely(RING_HAS_UNCONSUMED_REQUESTS(&vif->ctrl))) | |
2357 | return 1; | |
2358 | ||
2359 | return 0; | |
2360 | } | |
2361 | ||
2362 | int xenvif_ctrl_kthread(void *data) | |
2363 | { | |
2364 | struct xenvif *vif = data; | |
2365 | ||
2366 | for (;;) { | |
2367 | wait_event_interruptible(vif->ctrl_wq, | |
2368 | xenvif_ctrl_work_todo(vif) || | |
2369 | kthread_should_stop()); | |
2370 | if (kthread_should_stop()) | |
2371 | break; | |
2372 | ||
2373 | while (xenvif_ctrl_work_todo(vif)) | |
2374 | xenvif_ctrl_action(vif); | |
2375 | ||
2376 | cond_resched(); | |
2377 | } | |
2378 | ||
2379 | return 0; | |
2380 | } | |
2381 | ||
f942dc25 IC |
2382 | static int __init netback_init(void) |
2383 | { | |
f942dc25 | 2384 | int rc = 0; |
f942dc25 | 2385 | |
2a14b244 | 2386 | if (!xen_domain()) |
f942dc25 IC |
2387 | return -ENODEV; |
2388 | ||
4c82ac3c WL |
2389 | /* Allow as many queues as there are CPUs if user has not |
2390 | * specified a value. | |
2391 | */ | |
2392 | if (xenvif_max_queues == 0) | |
2393 | xenvif_max_queues = num_online_cpus(); | |
8d3d53b3 | 2394 | |
37641494 | 2395 | if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) { |
383eda32 JP |
2396 | pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n", |
2397 | fatal_skb_slots, XEN_NETBK_LEGACY_SLOTS_MAX); | |
37641494 | 2398 | fatal_skb_slots = XEN_NETBK_LEGACY_SLOTS_MAX; |
2810e5b9 WL |
2399 | } |
2400 | ||
f942dc25 IC |
2401 | rc = xenvif_xenbus_init(); |
2402 | if (rc) | |
2403 | goto failed_init; | |
2404 | ||
f51de243 ZK |
2405 | #ifdef CONFIG_DEBUG_FS |
2406 | xen_netback_dbg_root = debugfs_create_dir("xen-netback", NULL); | |
2407 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
2408 | pr_warn("Init of debugfs returned %ld!\n", | |
2409 | PTR_ERR(xen_netback_dbg_root)); | |
2410 | #endif /* CONFIG_DEBUG_FS */ | |
2411 | ||
f942dc25 IC |
2412 | return 0; |
2413 | ||
2414 | failed_init: | |
f942dc25 | 2415 | return rc; |
f942dc25 IC |
2416 | } |
2417 | ||
2418 | module_init(netback_init); | |
2419 | ||
b103f358 WL |
2420 | static void __exit netback_fini(void) |
2421 | { | |
f51de243 ZK |
2422 | #ifdef CONFIG_DEBUG_FS |
2423 | if (!IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
2424 | debugfs_remove_recursive(xen_netback_dbg_root); | |
2425 | #endif /* CONFIG_DEBUG_FS */ | |
b103f358 | 2426 | xenvif_xenbus_fini(); |
b103f358 WL |
2427 | } |
2428 | module_exit(netback_fini); | |
2429 | ||
f942dc25 | 2430 | MODULE_LICENSE("Dual BSD/GPL"); |
f984cec6 | 2431 | MODULE_ALIAS("xen-backend:vif"); |