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