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 | |
56dd5af9 | 70 | #define MAX_QUEUES_DEFAULT 8 |
8d3d53b3 AB |
71 | unsigned int xenvif_max_queues; |
72 | module_param_named(max_queues, xenvif_max_queues, uint, 0644); | |
73 | MODULE_PARM_DESC(max_queues, | |
74 | "Maximum number of queues per virtual interface"); | |
75 | ||
2810e5b9 WL |
76 | /* |
77 | * This is the maximum slots a skb can have. If a guest sends a skb | |
78 | * which exceeds this limit it is considered malicious. | |
79 | */ | |
37641494 WL |
80 | #define FATAL_SKB_SLOTS_DEFAULT 20 |
81 | static unsigned int fatal_skb_slots = FATAL_SKB_SLOTS_DEFAULT; | |
82 | module_param(fatal_skb_slots, uint, 0444); | |
83 | ||
7e5d7753 MC |
84 | /* The amount to copy out of the first guest Tx slot into the skb's |
85 | * linear area. If the first slot has more data, it will be mapped | |
86 | * and put into the first frag. | |
87 | * | |
88 | * This is sized to avoid pulling headers from the frags for most | |
89 | * TCP/IP packets. | |
90 | */ | |
91 | #define XEN_NETBACK_TX_COPY_LEN 128 | |
92 | ||
40d8abde PD |
93 | /* This is the maximum number of flows in the hash cache. */ |
94 | #define XENVIF_HASH_CACHE_SIZE_DEFAULT 64 | |
95 | unsigned int xenvif_hash_cache_size = XENVIF_HASH_CACHE_SIZE_DEFAULT; | |
96 | module_param_named(hash_cache_size, xenvif_hash_cache_size, uint, 0644); | |
97 | MODULE_PARM_DESC(hash_cache_size, "Number of flows in the hash cache"); | |
7e5d7753 | 98 | |
e9ce7cb6 | 99 | static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx, |
7376419a WL |
100 | u8 status); |
101 | ||
e9ce7cb6 | 102 | static void make_tx_response(struct xenvif_queue *queue, |
f942dc25 | 103 | struct xen_netif_tx_request *txp, |
562abd39 | 104 | unsigned int extra_count, |
f942dc25 | 105 | s8 st); |
c8a4d299 | 106 | static void push_tx_responses(struct xenvif_queue *queue); |
b3f980bd | 107 | |
e9ce7cb6 | 108 | static inline int tx_work_todo(struct xenvif_queue *queue); |
b3f980bd | 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 | ||
e9ce7cb6 | 152 | void xenvif_kick_thread(struct xenvif_queue *queue) |
b3f980bd | 153 | { |
e9ce7cb6 | 154 | wake_up(&queue->wq); |
b3f980bd WL |
155 | } |
156 | ||
e9ce7cb6 | 157 | void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue) |
f942dc25 IC |
158 | { |
159 | int more_to_do; | |
160 | ||
e9ce7cb6 | 161 | RING_FINAL_CHECK_FOR_REQUESTS(&queue->tx, more_to_do); |
f942dc25 IC |
162 | |
163 | if (more_to_do) | |
e9ce7cb6 | 164 | napi_schedule(&queue->napi); |
f942dc25 IC |
165 | } |
166 | ||
e9ce7cb6 | 167 | static void tx_add_credit(struct xenvif_queue *queue) |
f942dc25 IC |
168 | { |
169 | unsigned long max_burst, max_credit; | |
170 | ||
171 | /* | |
172 | * Allow a burst big enough to transmit a jumbo packet of up to 128kB. | |
173 | * Otherwise the interface can seize up due to insufficient credit. | |
174 | */ | |
0f589967 | 175 | max_burst = max(131072UL, queue->credit_bytes); |
f942dc25 IC |
176 | |
177 | /* Take care that adding a new chunk of credit doesn't wrap to zero. */ | |
e9ce7cb6 WL |
178 | max_credit = queue->remaining_credit + queue->credit_bytes; |
179 | if (max_credit < queue->remaining_credit) | |
f942dc25 IC |
180 | max_credit = ULONG_MAX; /* wrapped: clamp to ULONG_MAX */ |
181 | ||
e9ce7cb6 | 182 | queue->remaining_credit = min(max_credit, max_burst); |
dfa523ae | 183 | queue->rate_limited = false; |
f942dc25 IC |
184 | } |
185 | ||
cac6a8f9 | 186 | void xenvif_tx_credit_callback(struct timer_list *t) |
f942dc25 | 187 | { |
cac6a8f9 | 188 | struct xenvif_queue *queue = from_timer(queue, t, credit_timeout); |
e9ce7cb6 WL |
189 | tx_add_credit(queue); |
190 | xenvif_napi_schedule_or_enable_events(queue); | |
f942dc25 IC |
191 | } |
192 | ||
e9ce7cb6 | 193 | static void xenvif_tx_err(struct xenvif_queue *queue, |
562abd39 PD |
194 | struct xen_netif_tx_request *txp, |
195 | unsigned int extra_count, RING_IDX end) | |
f942dc25 | 196 | { |
e9ce7cb6 | 197 | RING_IDX cons = queue->tx.req_cons; |
f53c3fe8 | 198 | unsigned long flags; |
f942dc25 IC |
199 | |
200 | do { | |
e9ce7cb6 | 201 | spin_lock_irqsave(&queue->response_lock, flags); |
562abd39 | 202 | make_tx_response(queue, txp, extra_count, XEN_NETIF_RSP_ERROR); |
c8a4d299 | 203 | push_tx_responses(queue); |
e9ce7cb6 | 204 | spin_unlock_irqrestore(&queue->response_lock, flags); |
b9149729 | 205 | if (cons == end) |
f942dc25 | 206 | break; |
68a33bfd | 207 | RING_COPY_REQUEST(&queue->tx, cons++, txp); |
72eec92a | 208 | extra_count = 0; /* only the first frag can have extras */ |
f942dc25 | 209 | } while (1); |
e9ce7cb6 | 210 | queue->tx.req_cons = cons; |
f942dc25 IC |
211 | } |
212 | ||
7376419a | 213 | static void xenvif_fatal_tx_err(struct xenvif *vif) |
48856286 IC |
214 | { |
215 | netdev_err(vif->dev, "fatal error; disabling device\n"); | |
e9d8b2c2 | 216 | vif->disabled = true; |
e9ce7cb6 | 217 | /* Disable the vif from queue 0's kthread */ |
b17075d5 | 218 | if (vif->num_queues) |
e9ce7cb6 | 219 | xenvif_kick_thread(&vif->queues[0]); |
48856286 IC |
220 | } |
221 | ||
e9ce7cb6 | 222 | static int xenvif_count_requests(struct xenvif_queue *queue, |
7376419a | 223 | struct xen_netif_tx_request *first, |
562abd39 | 224 | unsigned int extra_count, |
7376419a WL |
225 | struct xen_netif_tx_request *txp, |
226 | int work_to_do) | |
f942dc25 | 227 | { |
e9ce7cb6 | 228 | RING_IDX cons = queue->tx.req_cons; |
2810e5b9 WL |
229 | int slots = 0; |
230 | int drop_err = 0; | |
59ccb4eb | 231 | int more_data; |
f942dc25 IC |
232 | |
233 | if (!(first->flags & XEN_NETTXF_more_data)) | |
234 | return 0; | |
235 | ||
236 | do { | |
59ccb4eb WL |
237 | struct xen_netif_tx_request dropped_tx = { 0 }; |
238 | ||
2810e5b9 | 239 | if (slots >= work_to_do) { |
e9ce7cb6 | 240 | netdev_err(queue->vif->dev, |
2810e5b9 WL |
241 | "Asked for %d slots but exceeds this limit\n", |
242 | work_to_do); | |
e9ce7cb6 | 243 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 244 | return -ENODATA; |
f942dc25 IC |
245 | } |
246 | ||
2810e5b9 WL |
247 | /* This guest is really using too many slots and |
248 | * considered malicious. | |
249 | */ | |
37641494 | 250 | if (unlikely(slots >= fatal_skb_slots)) { |
e9ce7cb6 | 251 | netdev_err(queue->vif->dev, |
2810e5b9 | 252 | "Malicious frontend using %d slots, threshold %u\n", |
37641494 | 253 | slots, fatal_skb_slots); |
e9ce7cb6 | 254 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 255 | return -E2BIG; |
f942dc25 IC |
256 | } |
257 | ||
2810e5b9 | 258 | /* Xen network protocol had implicit dependency on |
37641494 WL |
259 | * MAX_SKB_FRAGS. XEN_NETBK_LEGACY_SLOTS_MAX is set to |
260 | * the historical MAX_SKB_FRAGS value 18 to honor the | |
261 | * same behavior as before. Any packet using more than | |
262 | * 18 slots but less than fatal_skb_slots slots is | |
263 | * dropped | |
2810e5b9 | 264 | */ |
37641494 | 265 | if (!drop_err && slots >= XEN_NETBK_LEGACY_SLOTS_MAX) { |
2810e5b9 | 266 | if (net_ratelimit()) |
e9ce7cb6 | 267 | netdev_dbg(queue->vif->dev, |
2810e5b9 | 268 | "Too many slots (%d) exceeding limit (%d), dropping packet\n", |
37641494 | 269 | slots, XEN_NETBK_LEGACY_SLOTS_MAX); |
2810e5b9 WL |
270 | drop_err = -E2BIG; |
271 | } | |
272 | ||
59ccb4eb WL |
273 | if (drop_err) |
274 | txp = &dropped_tx; | |
275 | ||
68a33bfd | 276 | RING_COPY_REQUEST(&queue->tx, cons + slots, txp); |
03393fd5 WL |
277 | |
278 | /* If the guest submitted a frame >= 64 KiB then | |
279 | * first->size overflowed and following slots will | |
280 | * appear to be larger than the frame. | |
281 | * | |
282 | * This cannot be fatal error as there are buggy | |
283 | * frontends that do this. | |
284 | * | |
285 | * Consume all slots and drop the packet. | |
286 | */ | |
287 | if (!drop_err && txp->size > first->size) { | |
288 | if (net_ratelimit()) | |
e9ce7cb6 | 289 | netdev_dbg(queue->vif->dev, |
03393fd5 WL |
290 | "Invalid tx request, slot size %u > remaining size %u\n", |
291 | txp->size, first->size); | |
292 | drop_err = -EIO; | |
f942dc25 IC |
293 | } |
294 | ||
295 | first->size -= txp->size; | |
2810e5b9 | 296 | slots++; |
f942dc25 | 297 | |
d0089e8a | 298 | if (unlikely((txp->offset + txp->size) > XEN_PAGE_SIZE)) { |
68946159 | 299 | netdev_err(queue->vif->dev, "Cross page boundary, txp->offset: %u, size: %u\n", |
f942dc25 | 300 | txp->offset, txp->size); |
e9ce7cb6 | 301 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 302 | return -EINVAL; |
f942dc25 | 303 | } |
59ccb4eb WL |
304 | |
305 | more_data = txp->flags & XEN_NETTXF_more_data; | |
306 | ||
307 | if (!drop_err) | |
308 | txp++; | |
309 | ||
310 | } while (more_data); | |
2810e5b9 WL |
311 | |
312 | if (drop_err) { | |
562abd39 | 313 | xenvif_tx_err(queue, first, extra_count, cons + slots); |
2810e5b9 WL |
314 | return drop_err; |
315 | } | |
316 | ||
317 | return slots; | |
f942dc25 IC |
318 | } |
319 | ||
8f13dd96 ZK |
320 | |
321 | struct xenvif_tx_cb { | |
322 | u16 pending_idx; | |
323 | }; | |
324 | ||
325 | #define XENVIF_TX_CB(skb) ((struct xenvif_tx_cb *)(skb)->cb) | |
326 | ||
e9ce7cb6 | 327 | static inline void xenvif_tx_create_map_op(struct xenvif_queue *queue, |
562abd39 PD |
328 | u16 pending_idx, |
329 | struct xen_netif_tx_request *txp, | |
330 | unsigned int extra_count, | |
331 | struct gnttab_map_grant_ref *mop) | |
f53c3fe8 | 332 | { |
e9ce7cb6 WL |
333 | queue->pages_to_map[mop-queue->tx_map_ops] = queue->mmap_pages[pending_idx]; |
334 | gnttab_set_map_op(mop, idx_to_kaddr(queue, pending_idx), | |
f53c3fe8 | 335 | GNTMAP_host_map | GNTMAP_readonly, |
e9ce7cb6 | 336 | txp->gref, queue->vif->domid); |
f53c3fe8 | 337 | |
e9ce7cb6 | 338 | memcpy(&queue->pending_tx_info[pending_idx].req, txp, |
f53c3fe8 | 339 | sizeof(*txp)); |
562abd39 | 340 | queue->pending_tx_info[pending_idx].extra_count = extra_count; |
f53c3fe8 ZK |
341 | } |
342 | ||
e3377f36 ZK |
343 | static inline struct sk_buff *xenvif_alloc_skb(unsigned int size) |
344 | { | |
345 | struct sk_buff *skb = | |
346 | alloc_skb(size + NET_SKB_PAD + NET_IP_ALIGN, | |
347 | GFP_ATOMIC | __GFP_NOWARN); | |
348 | if (unlikely(skb == NULL)) | |
349 | return NULL; | |
350 | ||
351 | /* Packets passed to netif_rx() must have some headroom. */ | |
352 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); | |
353 | ||
354 | /* Initialize it here to avoid later surprises */ | |
355 | skb_shinfo(skb)->destructor_arg = NULL; | |
356 | ||
357 | return skb; | |
358 | } | |
359 | ||
e9ce7cb6 | 360 | static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif_queue *queue, |
f53c3fe8 ZK |
361 | struct sk_buff *skb, |
362 | struct xen_netif_tx_request *txp, | |
2475b225 RL |
363 | struct gnttab_map_grant_ref *gop, |
364 | unsigned int frag_overflow, | |
365 | struct sk_buff *nskb) | |
f942dc25 IC |
366 | { |
367 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
368 | skb_frag_t *frags = shinfo->frags; | |
8f13dd96 | 369 | u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx; |
62bad319 ZK |
370 | int start; |
371 | pending_ring_idx_t index; | |
2475b225 | 372 | unsigned int nr_slots; |
2810e5b9 | 373 | |
2810e5b9 | 374 | nr_slots = shinfo->nr_frags; |
f942dc25 IC |
375 | |
376 | /* Skip first skb fragment if it is on same page as header fragment. */ | |
ea066ad1 | 377 | start = (frag_get_pending_idx(&shinfo->frags[0]) == pending_idx); |
f942dc25 | 378 | |
f53c3fe8 ZK |
379 | for (shinfo->nr_frags = start; shinfo->nr_frags < nr_slots; |
380 | shinfo->nr_frags++, txp++, gop++) { | |
e9ce7cb6 WL |
381 | index = pending_index(queue->pending_cons++); |
382 | pending_idx = queue->pending_ring[index]; | |
562abd39 | 383 | xenvif_tx_create_map_op(queue, pending_idx, txp, 0, gop); |
f53c3fe8 | 384 | frag_set_pending_idx(&frags[shinfo->nr_frags], pending_idx); |
f942dc25 IC |
385 | } |
386 | ||
e3377f36 | 387 | if (frag_overflow) { |
e3377f36 ZK |
388 | |
389 | shinfo = skb_shinfo(nskb); | |
390 | frags = shinfo->frags; | |
391 | ||
392 | for (shinfo->nr_frags = 0; shinfo->nr_frags < frag_overflow; | |
393 | shinfo->nr_frags++, txp++, gop++) { | |
e9ce7cb6 WL |
394 | index = pending_index(queue->pending_cons++); |
395 | pending_idx = queue->pending_ring[index]; | |
562abd39 PD |
396 | xenvif_tx_create_map_op(queue, pending_idx, txp, 0, |
397 | gop); | |
e3377f36 ZK |
398 | frag_set_pending_idx(&frags[shinfo->nr_frags], |
399 | pending_idx); | |
400 | } | |
401 | ||
402 | skb_shinfo(skb)->frag_list = nskb; | |
403 | } | |
2810e5b9 | 404 | |
f942dc25 IC |
405 | return gop; |
406 | } | |
407 | ||
e9ce7cb6 | 408 | static inline void xenvif_grant_handle_set(struct xenvif_queue *queue, |
f53c3fe8 ZK |
409 | u16 pending_idx, |
410 | grant_handle_t handle) | |
411 | { | |
e9ce7cb6 | 412 | if (unlikely(queue->grant_tx_handle[pending_idx] != |
f53c3fe8 | 413 | NETBACK_INVALID_HANDLE)) { |
e9ce7cb6 | 414 | netdev_err(queue->vif->dev, |
68946159 | 415 | "Trying to overwrite active handle! pending_idx: 0x%x\n", |
f53c3fe8 ZK |
416 | pending_idx); |
417 | BUG(); | |
418 | } | |
e9ce7cb6 | 419 | queue->grant_tx_handle[pending_idx] = handle; |
f53c3fe8 ZK |
420 | } |
421 | ||
e9ce7cb6 | 422 | static inline void xenvif_grant_handle_reset(struct xenvif_queue *queue, |
f53c3fe8 ZK |
423 | u16 pending_idx) |
424 | { | |
e9ce7cb6 | 425 | if (unlikely(queue->grant_tx_handle[pending_idx] == |
f53c3fe8 | 426 | NETBACK_INVALID_HANDLE)) { |
e9ce7cb6 | 427 | netdev_err(queue->vif->dev, |
68946159 | 428 | "Trying to unmap invalid handle! pending_idx: 0x%x\n", |
f53c3fe8 ZK |
429 | pending_idx); |
430 | BUG(); | |
431 | } | |
e9ce7cb6 | 432 | queue->grant_tx_handle[pending_idx] = NETBACK_INVALID_HANDLE; |
f53c3fe8 ZK |
433 | } |
434 | ||
e9ce7cb6 | 435 | static int xenvif_tx_check_gop(struct xenvif_queue *queue, |
7376419a | 436 | struct sk_buff *skb, |
bdab8275 ZK |
437 | struct gnttab_map_grant_ref **gopp_map, |
438 | struct gnttab_copy **gopp_copy) | |
f942dc25 | 439 | { |
9074ce24 | 440 | struct gnttab_map_grant_ref *gop_map = *gopp_map; |
8f13dd96 | 441 | u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx; |
1a998d3e ZK |
442 | /* This always points to the shinfo of the skb being checked, which |
443 | * could be either the first or the one on the frag_list | |
444 | */ | |
f942dc25 | 445 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
1a998d3e ZK |
446 | /* If this is non-NULL, we are currently checking the frag_list skb, and |
447 | * this points to the shinfo of the first one | |
448 | */ | |
449 | struct skb_shared_info *first_shinfo = NULL; | |
f942dc25 | 450 | int nr_frags = shinfo->nr_frags; |
1b860da0 ZK |
451 | const bool sharedslot = nr_frags && |
452 | frag_get_pending_idx(&shinfo->frags[0]) == pending_idx; | |
bdab8275 | 453 | int i, err; |
f942dc25 IC |
454 | |
455 | /* Check status of header. */ | |
bdab8275 | 456 | err = (*gopp_copy)->status; |
bdab8275 ZK |
457 | if (unlikely(err)) { |
458 | if (net_ratelimit()) | |
e9ce7cb6 | 459 | netdev_dbg(queue->vif->dev, |
00aefceb | 460 | "Grant copy of header failed! status: %d pending_idx: %u ref: %u\n", |
bdab8275 ZK |
461 | (*gopp_copy)->status, |
462 | pending_idx, | |
463 | (*gopp_copy)->source.u.ref); | |
1b860da0 ZK |
464 | /* The first frag might still have this slot mapped */ |
465 | if (!sharedslot) | |
466 | xenvif_idx_release(queue, pending_idx, | |
467 | XEN_NETIF_RSP_ERROR); | |
bdab8275 | 468 | } |
d8cfbfc4 | 469 | (*gopp_copy)++; |
f942dc25 | 470 | |
e3377f36 | 471 | check_frags: |
bdab8275 | 472 | for (i = 0; i < nr_frags; i++, gop_map++) { |
f942dc25 | 473 | int j, newerr; |
f942dc25 | 474 | |
ea066ad1 | 475 | pending_idx = frag_get_pending_idx(&shinfo->frags[i]); |
f942dc25 IC |
476 | |
477 | /* Check error status: if okay then remember grant handle. */ | |
bdab8275 | 478 | newerr = gop_map->status; |
2810e5b9 | 479 | |
f942dc25 | 480 | if (likely(!newerr)) { |
e9ce7cb6 | 481 | xenvif_grant_handle_set(queue, |
9074ce24 ZK |
482 | pending_idx, |
483 | gop_map->handle); | |
f942dc25 | 484 | /* Had a previous error? Invalidate this fragment. */ |
1b860da0 | 485 | if (unlikely(err)) { |
e9ce7cb6 | 486 | xenvif_idx_unmap(queue, pending_idx); |
1b860da0 ZK |
487 | /* If the mapping of the first frag was OK, but |
488 | * the header's copy failed, and they are | |
489 | * sharing a slot, send an error | |
490 | */ | |
491 | if (i == 0 && sharedslot) | |
492 | xenvif_idx_release(queue, pending_idx, | |
493 | XEN_NETIF_RSP_ERROR); | |
494 | else | |
495 | xenvif_idx_release(queue, pending_idx, | |
496 | XEN_NETIF_RSP_OKAY); | |
497 | } | |
f942dc25 IC |
498 | continue; |
499 | } | |
500 | ||
501 | /* Error on this fragment: respond to client with an error. */ | |
bdab8275 | 502 | if (net_ratelimit()) |
e9ce7cb6 | 503 | netdev_dbg(queue->vif->dev, |
00aefceb | 504 | "Grant map of %d. frag failed! status: %d pending_idx: %u ref: %u\n", |
bdab8275 ZK |
505 | i, |
506 | gop_map->status, | |
507 | pending_idx, | |
508 | gop_map->ref); | |
1b860da0 | 509 | |
e9ce7cb6 | 510 | xenvif_idx_release(queue, pending_idx, XEN_NETIF_RSP_ERROR); |
f942dc25 IC |
511 | |
512 | /* Not the first error? Preceding frags already invalidated. */ | |
513 | if (err) | |
514 | continue; | |
1b860da0 ZK |
515 | |
516 | /* First error: if the header haven't shared a slot with the | |
517 | * first frag, release it as well. | |
518 | */ | |
519 | if (!sharedslot) | |
520 | xenvif_idx_release(queue, | |
521 | XENVIF_TX_CB(skb)->pending_idx, | |
522 | XEN_NETIF_RSP_OKAY); | |
523 | ||
524 | /* Invalidate preceding fragments of this skb. */ | |
bdab8275 | 525 | for (j = 0; j < i; j++) { |
5ccb3ea7 | 526 | pending_idx = frag_get_pending_idx(&shinfo->frags[j]); |
e9ce7cb6 | 527 | xenvif_idx_unmap(queue, pending_idx); |
1b860da0 ZK |
528 | xenvif_idx_release(queue, pending_idx, |
529 | XEN_NETIF_RSP_OKAY); | |
f942dc25 IC |
530 | } |
531 | ||
1a998d3e ZK |
532 | /* And if we found the error while checking the frag_list, unmap |
533 | * the first skb's frags | |
534 | */ | |
535 | if (first_shinfo) { | |
536 | for (j = 0; j < first_shinfo->nr_frags; j++) { | |
537 | pending_idx = frag_get_pending_idx(&first_shinfo->frags[j]); | |
538 | xenvif_idx_unmap(queue, pending_idx); | |
1b860da0 ZK |
539 | xenvif_idx_release(queue, pending_idx, |
540 | XEN_NETIF_RSP_OKAY); | |
1a998d3e | 541 | } |
f942dc25 IC |
542 | } |
543 | ||
544 | /* Remember the error: invalidate all subsequent fragments. */ | |
545 | err = newerr; | |
546 | } | |
547 | ||
1a998d3e ZK |
548 | if (skb_has_frag_list(skb) && !first_shinfo) { |
549 | first_shinfo = skb_shinfo(skb); | |
550 | shinfo = skb_shinfo(skb_shinfo(skb)->frag_list); | |
e3377f36 | 551 | nr_frags = shinfo->nr_frags; |
e3377f36 ZK |
552 | |
553 | goto check_frags; | |
554 | } | |
555 | ||
bdab8275 | 556 | *gopp_map = gop_map; |
f942dc25 IC |
557 | return err; |
558 | } | |
559 | ||
e9ce7cb6 | 560 | static void xenvif_fill_frags(struct xenvif_queue *queue, struct sk_buff *skb) |
f942dc25 IC |
561 | { |
562 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
563 | int nr_frags = shinfo->nr_frags; | |
564 | int i; | |
f53c3fe8 ZK |
565 | u16 prev_pending_idx = INVALID_PENDING_IDX; |
566 | ||
f942dc25 IC |
567 | for (i = 0; i < nr_frags; i++) { |
568 | skb_frag_t *frag = shinfo->frags + i; | |
569 | struct xen_netif_tx_request *txp; | |
ea066ad1 IC |
570 | struct page *page; |
571 | u16 pending_idx; | |
f942dc25 | 572 | |
ea066ad1 | 573 | pending_idx = frag_get_pending_idx(frag); |
f942dc25 | 574 | |
f53c3fe8 | 575 | /* If this is not the first frag, chain it to the previous*/ |
bdab8275 | 576 | if (prev_pending_idx == INVALID_PENDING_IDX) |
f53c3fe8 | 577 | skb_shinfo(skb)->destructor_arg = |
e9ce7cb6 | 578 | &callback_param(queue, pending_idx); |
bdab8275 | 579 | else |
e9ce7cb6 WL |
580 | callback_param(queue, prev_pending_idx).ctx = |
581 | &callback_param(queue, pending_idx); | |
f53c3fe8 | 582 | |
e9ce7cb6 | 583 | callback_param(queue, pending_idx).ctx = NULL; |
f53c3fe8 ZK |
584 | prev_pending_idx = pending_idx; |
585 | ||
e9ce7cb6 WL |
586 | txp = &queue->pending_tx_info[pending_idx].req; |
587 | page = virt_to_page(idx_to_kaddr(queue, pending_idx)); | |
ea066ad1 | 588 | __skb_fill_page_desc(skb, i, page, txp->offset, txp->size); |
f942dc25 IC |
589 | skb->len += txp->size; |
590 | skb->data_len += txp->size; | |
591 | skb->truesize += txp->size; | |
592 | ||
f53c3fe8 | 593 | /* Take an extra reference to offset network stack's put_page */ |
e9ce7cb6 | 594 | get_page(queue->mmap_pages[pending_idx]); |
f942dc25 IC |
595 | } |
596 | } | |
597 | ||
e9ce7cb6 | 598 | static int xenvif_get_extras(struct xenvif_queue *queue, |
562abd39 PD |
599 | struct xen_netif_extra_info *extras, |
600 | unsigned int *extra_count, | |
601 | int work_to_do) | |
f942dc25 IC |
602 | { |
603 | struct xen_netif_extra_info extra; | |
e9ce7cb6 | 604 | RING_IDX cons = queue->tx.req_cons; |
f942dc25 IC |
605 | |
606 | do { | |
607 | if (unlikely(work_to_do-- <= 0)) { | |
e9ce7cb6 WL |
608 | netdev_err(queue->vif->dev, "Missing extra info\n"); |
609 | xenvif_fatal_tx_err(queue->vif); | |
f942dc25 IC |
610 | return -EBADR; |
611 | } | |
612 | ||
68a33bfd | 613 | RING_COPY_REQUEST(&queue->tx, cons, &extra); |
562abd39 PD |
614 | |
615 | queue->tx.req_cons = ++cons; | |
616 | (*extra_count)++; | |
617 | ||
f942dc25 IC |
618 | if (unlikely(!extra.type || |
619 | extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
e9ce7cb6 | 620 | netdev_err(queue->vif->dev, |
f942dc25 | 621 | "Invalid extra type: %d\n", extra.type); |
e9ce7cb6 | 622 | xenvif_fatal_tx_err(queue->vif); |
f942dc25 IC |
623 | return -EINVAL; |
624 | } | |
625 | ||
626 | memcpy(&extras[extra.type - 1], &extra, sizeof(extra)); | |
f942dc25 IC |
627 | } while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE); |
628 | ||
629 | return work_to_do; | |
630 | } | |
631 | ||
7376419a WL |
632 | static int xenvif_set_skb_gso(struct xenvif *vif, |
633 | struct sk_buff *skb, | |
634 | struct xen_netif_extra_info *gso) | |
f942dc25 IC |
635 | { |
636 | if (!gso->u.gso.size) { | |
48856286 | 637 | netdev_err(vif->dev, "GSO size must not be zero.\n"); |
7376419a | 638 | xenvif_fatal_tx_err(vif); |
f942dc25 IC |
639 | return -EINVAL; |
640 | } | |
641 | ||
a9468587 PD |
642 | switch (gso->u.gso.type) { |
643 | case XEN_NETIF_GSO_TYPE_TCPV4: | |
644 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
645 | break; | |
646 | case XEN_NETIF_GSO_TYPE_TCPV6: | |
647 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
648 | break; | |
649 | default: | |
48856286 | 650 | netdev_err(vif->dev, "Bad GSO type %d.\n", gso->u.gso.type); |
7376419a | 651 | xenvif_fatal_tx_err(vif); |
f942dc25 IC |
652 | return -EINVAL; |
653 | } | |
654 | ||
655 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
b89587a7 | 656 | /* gso_segs will be calculated later */ |
f942dc25 IC |
657 | |
658 | return 0; | |
659 | } | |
660 | ||
e9ce7cb6 | 661 | static int checksum_setup(struct xenvif_queue *queue, struct sk_buff *skb) |
2eba61d5 | 662 | { |
2721637c | 663 | bool recalculate_partial_csum = false; |
2eba61d5 PD |
664 | |
665 | /* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
666 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
667 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
668 | * recalculate the partial checksum. | |
669 | */ | |
670 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
e9ce7cb6 | 671 | queue->stats.rx_gso_checksum_fixup++; |
2eba61d5 | 672 | skb->ip_summed = CHECKSUM_PARTIAL; |
2721637c | 673 | recalculate_partial_csum = true; |
2eba61d5 PD |
674 | } |
675 | ||
676 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
677 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
678 | return 0; | |
679 | ||
2721637c | 680 | return skb_checksum_setup(skb, recalculate_partial_csum); |
2eba61d5 PD |
681 | } |
682 | ||
e9ce7cb6 | 683 | static bool tx_credit_exceeded(struct xenvif_queue *queue, unsigned size) |
f942dc25 | 684 | { |
059dfa6a | 685 | u64 now = get_jiffies_64(); |
e9ce7cb6 WL |
686 | u64 next_credit = queue->credit_window_start + |
687 | msecs_to_jiffies(queue->credit_usec / 1000); | |
f942dc25 IC |
688 | |
689 | /* Timer could already be pending in rare cases. */ | |
dfa523ae WL |
690 | if (timer_pending(&queue->credit_timeout)) { |
691 | queue->rate_limited = true; | |
f942dc25 | 692 | return true; |
dfa523ae | 693 | } |
f942dc25 IC |
694 | |
695 | /* Passed the point where we can replenish credit? */ | |
059dfa6a | 696 | if (time_after_eq64(now, next_credit)) { |
e9ce7cb6 WL |
697 | queue->credit_window_start = now; |
698 | tx_add_credit(queue); | |
f942dc25 IC |
699 | } |
700 | ||
701 | /* Still too big to send right now? Set a callback. */ | |
e9ce7cb6 | 702 | if (size > queue->remaining_credit) { |
e9ce7cb6 | 703 | mod_timer(&queue->credit_timeout, |
f942dc25 | 704 | next_credit); |
e9ce7cb6 | 705 | queue->credit_window_start = next_credit; |
dfa523ae | 706 | queue->rate_limited = true; |
f942dc25 IC |
707 | |
708 | return true; | |
709 | } | |
710 | ||
711 | return false; | |
712 | } | |
713 | ||
210c34dc PD |
714 | /* No locking is required in xenvif_mcast_add/del() as they are |
715 | * only ever invoked from NAPI poll. An RCU list is used because | |
716 | * xenvif_mcast_match() is called asynchronously, during start_xmit. | |
717 | */ | |
718 | ||
719 | static int xenvif_mcast_add(struct xenvif *vif, const u8 *addr) | |
720 | { | |
721 | struct xenvif_mcast_addr *mcast; | |
722 | ||
723 | if (vif->fe_mcast_count == XEN_NETBK_MCAST_MAX) { | |
724 | if (net_ratelimit()) | |
725 | netdev_err(vif->dev, | |
726 | "Too many multicast addresses\n"); | |
727 | return -ENOSPC; | |
728 | } | |
729 | ||
730 | mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC); | |
731 | if (!mcast) | |
732 | return -ENOMEM; | |
733 | ||
734 | ether_addr_copy(mcast->addr, addr); | |
735 | list_add_tail_rcu(&mcast->entry, &vif->fe_mcast_addr); | |
736 | vif->fe_mcast_count++; | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
741 | static void xenvif_mcast_del(struct xenvif *vif, const u8 *addr) | |
742 | { | |
743 | struct xenvif_mcast_addr *mcast; | |
744 | ||
745 | list_for_each_entry_rcu(mcast, &vif->fe_mcast_addr, entry) { | |
746 | if (ether_addr_equal(addr, mcast->addr)) { | |
747 | --vif->fe_mcast_count; | |
748 | list_del_rcu(&mcast->entry); | |
749 | kfree_rcu(mcast, rcu); | |
750 | break; | |
751 | } | |
752 | } | |
753 | } | |
754 | ||
755 | bool xenvif_mcast_match(struct xenvif *vif, const u8 *addr) | |
756 | { | |
757 | struct xenvif_mcast_addr *mcast; | |
758 | ||
759 | rcu_read_lock(); | |
760 | list_for_each_entry_rcu(mcast, &vif->fe_mcast_addr, entry) { | |
761 | if (ether_addr_equal(addr, mcast->addr)) { | |
762 | rcu_read_unlock(); | |
763 | return true; | |
764 | } | |
765 | } | |
766 | rcu_read_unlock(); | |
767 | ||
768 | return false; | |
769 | } | |
770 | ||
771 | void xenvif_mcast_addr_list_free(struct xenvif *vif) | |
772 | { | |
773 | /* No need for locking or RCU here. NAPI poll and TX queue | |
774 | * are stopped. | |
775 | */ | |
776 | while (!list_empty(&vif->fe_mcast_addr)) { | |
777 | struct xenvif_mcast_addr *mcast; | |
778 | ||
779 | mcast = list_first_entry(&vif->fe_mcast_addr, | |
780 | struct xenvif_mcast_addr, | |
781 | entry); | |
782 | --vif->fe_mcast_count; | |
783 | list_del(&mcast->entry); | |
784 | kfree(mcast); | |
785 | } | |
786 | } | |
787 | ||
e9ce7cb6 | 788 | static void xenvif_tx_build_gops(struct xenvif_queue *queue, |
bdab8275 ZK |
789 | int budget, |
790 | unsigned *copy_ops, | |
791 | unsigned *map_ops) | |
f942dc25 | 792 | { |
2475b225 RL |
793 | struct gnttab_map_grant_ref *gop = queue->tx_map_ops; |
794 | struct sk_buff *skb, *nskb; | |
f942dc25 | 795 | int ret; |
2475b225 | 796 | unsigned int frag_overflow; |
f942dc25 | 797 | |
e9ce7cb6 | 798 | while (skb_queue_len(&queue->tx_queue) < budget) { |
f942dc25 | 799 | struct xen_netif_tx_request txreq; |
37641494 | 800 | struct xen_netif_tx_request txfrags[XEN_NETBK_LEGACY_SLOTS_MAX]; |
f942dc25 | 801 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX-1]; |
562abd39 | 802 | unsigned int extra_count; |
f942dc25 IC |
803 | u16 pending_idx; |
804 | RING_IDX idx; | |
805 | int work_to_do; | |
806 | unsigned int data_len; | |
807 | pending_ring_idx_t index; | |
808 | ||
e9ce7cb6 | 809 | if (queue->tx.sring->req_prod - queue->tx.req_cons > |
48856286 | 810 | XEN_NETIF_TX_RING_SIZE) { |
e9ce7cb6 | 811 | netdev_err(queue->vif->dev, |
48856286 IC |
812 | "Impossible number of requests. " |
813 | "req_prod %d, req_cons %d, size %ld\n", | |
e9ce7cb6 | 814 | queue->tx.sring->req_prod, queue->tx.req_cons, |
48856286 | 815 | XEN_NETIF_TX_RING_SIZE); |
e9ce7cb6 | 816 | xenvif_fatal_tx_err(queue->vif); |
e9d8b2c2 | 817 | break; |
48856286 IC |
818 | } |
819 | ||
e9ce7cb6 | 820 | work_to_do = RING_HAS_UNCONSUMED_REQUESTS(&queue->tx); |
b3f980bd WL |
821 | if (!work_to_do) |
822 | break; | |
f942dc25 | 823 | |
e9ce7cb6 | 824 | idx = queue->tx.req_cons; |
f942dc25 | 825 | rmb(); /* Ensure that we see the request before we copy it. */ |
68a33bfd | 826 | RING_COPY_REQUEST(&queue->tx, idx, &txreq); |
f942dc25 IC |
827 | |
828 | /* Credit-based scheduling. */ | |
e9ce7cb6 WL |
829 | if (txreq.size > queue->remaining_credit && |
830 | tx_credit_exceeded(queue, txreq.size)) | |
b3f980bd | 831 | break; |
f942dc25 | 832 | |
e9ce7cb6 | 833 | queue->remaining_credit -= txreq.size; |
f942dc25 IC |
834 | |
835 | work_to_do--; | |
e9ce7cb6 | 836 | queue->tx.req_cons = ++idx; |
f942dc25 IC |
837 | |
838 | memset(extras, 0, sizeof(extras)); | |
562abd39 | 839 | extra_count = 0; |
f942dc25 | 840 | if (txreq.flags & XEN_NETTXF_extra_info) { |
e9ce7cb6 | 841 | work_to_do = xenvif_get_extras(queue, extras, |
562abd39 | 842 | &extra_count, |
7376419a | 843 | work_to_do); |
e9ce7cb6 | 844 | idx = queue->tx.req_cons; |
48856286 | 845 | if (unlikely(work_to_do < 0)) |
b3f980bd | 846 | break; |
f942dc25 IC |
847 | } |
848 | ||
210c34dc PD |
849 | if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1].type) { |
850 | struct xen_netif_extra_info *extra; | |
851 | ||
852 | extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1]; | |
853 | ret = xenvif_mcast_add(queue->vif, extra->u.mcast.addr); | |
854 | ||
562abd39 | 855 | make_tx_response(queue, &txreq, extra_count, |
210c34dc PD |
856 | (ret == 0) ? |
857 | XEN_NETIF_RSP_OKAY : | |
858 | XEN_NETIF_RSP_ERROR); | |
859 | push_tx_responses(queue); | |
860 | continue; | |
861 | } | |
862 | ||
863 | if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1].type) { | |
864 | struct xen_netif_extra_info *extra; | |
865 | ||
866 | extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1]; | |
867 | xenvif_mcast_del(queue->vif, extra->u.mcast.addr); | |
868 | ||
562abd39 PD |
869 | make_tx_response(queue, &txreq, extra_count, |
870 | XEN_NETIF_RSP_OKAY); | |
210c34dc PD |
871 | push_tx_responses(queue); |
872 | continue; | |
873 | } | |
874 | ||
562abd39 PD |
875 | ret = xenvif_count_requests(queue, &txreq, extra_count, |
876 | txfrags, work_to_do); | |
48856286 | 877 | if (unlikely(ret < 0)) |
b3f980bd | 878 | break; |
48856286 | 879 | |
f942dc25 IC |
880 | idx += ret; |
881 | ||
882 | if (unlikely(txreq.size < ETH_HLEN)) { | |
e9ce7cb6 | 883 | netdev_dbg(queue->vif->dev, |
f942dc25 | 884 | "Bad packet size: %d\n", txreq.size); |
562abd39 | 885 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
b3f980bd | 886 | break; |
f942dc25 IC |
887 | } |
888 | ||
889 | /* No crossing a page as the payload mustn't fragment. */ | |
d0089e8a | 890 | if (unlikely((txreq.offset + txreq.size) > XEN_PAGE_SIZE)) { |
e9ce7cb6 | 891 | netdev_err(queue->vif->dev, |
68946159 | 892 | "txreq.offset: %u, size: %u, end: %lu\n", |
f942dc25 | 893 | txreq.offset, txreq.size, |
d0089e8a | 894 | (unsigned long)(txreq.offset&~XEN_PAGE_MASK) + txreq.size); |
e9ce7cb6 | 895 | xenvif_fatal_tx_err(queue->vif); |
b3f980bd | 896 | break; |
f942dc25 IC |
897 | } |
898 | ||
e9ce7cb6 WL |
899 | index = pending_index(queue->pending_cons); |
900 | pending_idx = queue->pending_ring[index]; | |
f942dc25 | 901 | |
7e5d7753 | 902 | data_len = (txreq.size > XEN_NETBACK_TX_COPY_LEN && |
37641494 | 903 | ret < XEN_NETBK_LEGACY_SLOTS_MAX) ? |
7e5d7753 | 904 | XEN_NETBACK_TX_COPY_LEN : txreq.size; |
f942dc25 | 905 | |
e3377f36 | 906 | skb = xenvif_alloc_skb(data_len); |
f942dc25 | 907 | if (unlikely(skb == NULL)) { |
e9ce7cb6 | 908 | netdev_dbg(queue->vif->dev, |
f942dc25 | 909 | "Can't allocate a skb in start_xmit.\n"); |
562abd39 | 910 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
f942dc25 IC |
911 | break; |
912 | } | |
913 | ||
2475b225 RL |
914 | skb_shinfo(skb)->nr_frags = ret; |
915 | if (data_len < txreq.size) | |
916 | skb_shinfo(skb)->nr_frags++; | |
917 | /* At this point shinfo->nr_frags is in fact the number of | |
918 | * slots, which can be as large as XEN_NETBK_LEGACY_SLOTS_MAX. | |
919 | */ | |
920 | frag_overflow = 0; | |
921 | nskb = NULL; | |
922 | if (skb_shinfo(skb)->nr_frags > MAX_SKB_FRAGS) { | |
923 | frag_overflow = skb_shinfo(skb)->nr_frags - MAX_SKB_FRAGS; | |
924 | BUG_ON(frag_overflow > MAX_SKB_FRAGS); | |
925 | skb_shinfo(skb)->nr_frags = MAX_SKB_FRAGS; | |
926 | nskb = xenvif_alloc_skb(0); | |
927 | if (unlikely(nskb == NULL)) { | |
928 | kfree_skb(skb); | |
562abd39 | 929 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
2475b225 RL |
930 | if (net_ratelimit()) |
931 | netdev_err(queue->vif->dev, | |
932 | "Can't allocate the frag_list skb.\n"); | |
933 | break; | |
934 | } | |
935 | } | |
936 | ||
f942dc25 IC |
937 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
938 | struct xen_netif_extra_info *gso; | |
939 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
940 | ||
e9ce7cb6 | 941 | if (xenvif_set_skb_gso(queue->vif, skb, gso)) { |
7376419a | 942 | /* Failure in xenvif_set_skb_gso is fatal. */ |
f942dc25 | 943 | kfree_skb(skb); |
2475b225 | 944 | kfree_skb(nskb); |
b3f980bd | 945 | break; |
f942dc25 IC |
946 | } |
947 | } | |
948 | ||
c2d09fde PD |
949 | if (extras[XEN_NETIF_EXTRA_TYPE_HASH - 1].type) { |
950 | struct xen_netif_extra_info *extra; | |
951 | enum pkt_hash_types type = PKT_HASH_TYPE_NONE; | |
952 | ||
953 | extra = &extras[XEN_NETIF_EXTRA_TYPE_HASH - 1]; | |
954 | ||
955 | switch (extra->u.hash.type) { | |
956 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV4: | |
957 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV6: | |
958 | type = PKT_HASH_TYPE_L3; | |
959 | break; | |
960 | ||
961 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP: | |
962 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP: | |
963 | type = PKT_HASH_TYPE_L4; | |
964 | break; | |
965 | ||
966 | default: | |
967 | break; | |
968 | } | |
969 | ||
970 | if (type != PKT_HASH_TYPE_NONE) | |
971 | skb_set_hash(skb, | |
972 | *(u32 *)extra->u.hash.value, | |
973 | type); | |
974 | } | |
975 | ||
8f13dd96 | 976 | XENVIF_TX_CB(skb)->pending_idx = pending_idx; |
f942dc25 IC |
977 | |
978 | __skb_put(skb, data_len); | |
e9ce7cb6 WL |
979 | queue->tx_copy_ops[*copy_ops].source.u.ref = txreq.gref; |
980 | queue->tx_copy_ops[*copy_ops].source.domid = queue->vif->domid; | |
981 | queue->tx_copy_ops[*copy_ops].source.offset = txreq.offset; | |
bdab8275 | 982 | |
e9ce7cb6 | 983 | queue->tx_copy_ops[*copy_ops].dest.u.gmfn = |
0df4f266 | 984 | virt_to_gfn(skb->data); |
e9ce7cb6 WL |
985 | queue->tx_copy_ops[*copy_ops].dest.domid = DOMID_SELF; |
986 | queue->tx_copy_ops[*copy_ops].dest.offset = | |
d0089e8a | 987 | offset_in_page(skb->data) & ~XEN_PAGE_MASK; |
bdab8275 | 988 | |
e9ce7cb6 WL |
989 | queue->tx_copy_ops[*copy_ops].len = data_len; |
990 | queue->tx_copy_ops[*copy_ops].flags = GNTCOPY_source_gref; | |
bdab8275 ZK |
991 | |
992 | (*copy_ops)++; | |
f942dc25 | 993 | |
f942dc25 | 994 | if (data_len < txreq.size) { |
ea066ad1 IC |
995 | frag_set_pending_idx(&skb_shinfo(skb)->frags[0], |
996 | pending_idx); | |
562abd39 PD |
997 | xenvif_tx_create_map_op(queue, pending_idx, &txreq, |
998 | extra_count, gop); | |
bdab8275 | 999 | gop++; |
f942dc25 | 1000 | } else { |
ea066ad1 IC |
1001 | frag_set_pending_idx(&skb_shinfo(skb)->frags[0], |
1002 | INVALID_PENDING_IDX); | |
562abd39 PD |
1003 | memcpy(&queue->pending_tx_info[pending_idx].req, |
1004 | &txreq, sizeof(txreq)); | |
1005 | queue->pending_tx_info[pending_idx].extra_count = | |
1006 | extra_count; | |
f942dc25 IC |
1007 | } |
1008 | ||
e9ce7cb6 | 1009 | queue->pending_cons++; |
f942dc25 | 1010 | |
2475b225 RL |
1011 | gop = xenvif_get_requests(queue, skb, txfrags, gop, |
1012 | frag_overflow, nskb); | |
f942dc25 | 1013 | |
e9ce7cb6 | 1014 | __skb_queue_tail(&queue->tx_queue, skb); |
1e0b6eac | 1015 | |
e9ce7cb6 | 1016 | queue->tx.req_cons = idx; |
f942dc25 | 1017 | |
e9ce7cb6 WL |
1018 | if (((gop-queue->tx_map_ops) >= ARRAY_SIZE(queue->tx_map_ops)) || |
1019 | (*copy_ops >= ARRAY_SIZE(queue->tx_copy_ops))) | |
f942dc25 IC |
1020 | break; |
1021 | } | |
1022 | ||
e9ce7cb6 | 1023 | (*map_ops) = gop - queue->tx_map_ops; |
bdab8275 | 1024 | return; |
f942dc25 IC |
1025 | } |
1026 | ||
e3377f36 ZK |
1027 | /* Consolidate skb with a frag_list into a brand new one with local pages on |
1028 | * frags. Returns 0 or -ENOMEM if can't allocate new pages. | |
1029 | */ | |
e9ce7cb6 | 1030 | static int xenvif_handle_frag_list(struct xenvif_queue *queue, struct sk_buff *skb) |
e3377f36 ZK |
1031 | { |
1032 | unsigned int offset = skb_headlen(skb); | |
1033 | skb_frag_t frags[MAX_SKB_FRAGS]; | |
49d9991a | 1034 | int i, f; |
e3377f36 ZK |
1035 | struct ubuf_info *uarg; |
1036 | struct sk_buff *nskb = skb_shinfo(skb)->frag_list; | |
1037 | ||
e9ce7cb6 WL |
1038 | queue->stats.tx_zerocopy_sent += 2; |
1039 | queue->stats.tx_frag_overflow++; | |
e3377f36 | 1040 | |
e9ce7cb6 | 1041 | xenvif_fill_frags(queue, nskb); |
e3377f36 ZK |
1042 | /* Subtract frags size, we will correct it later */ |
1043 | skb->truesize -= skb->data_len; | |
1044 | skb->len += nskb->len; | |
1045 | skb->data_len += nskb->len; | |
1046 | ||
1047 | /* create a brand new frags array and coalesce there */ | |
1048 | for (i = 0; offset < skb->len; i++) { | |
1049 | struct page *page; | |
1050 | unsigned int len; | |
1051 | ||
1052 | BUG_ON(i >= MAX_SKB_FRAGS); | |
44cc8ed1 | 1053 | page = alloc_page(GFP_ATOMIC); |
e3377f36 ZK |
1054 | if (!page) { |
1055 | int j; | |
1056 | skb->truesize += skb->data_len; | |
1057 | for (j = 0; j < i; j++) | |
d7840976 | 1058 | put_page(skb_frag_page(&frags[j])); |
e3377f36 ZK |
1059 | return -ENOMEM; |
1060 | } | |
1061 | ||
1062 | if (offset + PAGE_SIZE < skb->len) | |
1063 | len = PAGE_SIZE; | |
1064 | else | |
1065 | len = skb->len - offset; | |
1066 | if (skb_copy_bits(skb, offset, page_address(page), len)) | |
1067 | BUG(); | |
1068 | ||
1069 | offset += len; | |
d7840976 | 1070 | __skb_frag_set_page(&frags[i], page); |
e3377f36 ZK |
1071 | frags[i].page_offset = 0; |
1072 | skb_frag_size_set(&frags[i], len); | |
1073 | } | |
49d9991a DV |
1074 | |
1075 | /* Release all the original (foreign) frags. */ | |
1076 | for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) | |
1077 | skb_frag_unref(skb, f); | |
e3377f36 | 1078 | uarg = skb_shinfo(skb)->destructor_arg; |
a64bd934 WL |
1079 | /* increase inflight counter to offset decrement in callback */ |
1080 | atomic_inc(&queue->inflight_packets); | |
e3377f36 ZK |
1081 | uarg->callback(uarg, true); |
1082 | skb_shinfo(skb)->destructor_arg = NULL; | |
1083 | ||
b0c21bad DV |
1084 | /* Fill the skb with the new (local) frags. */ |
1085 | memcpy(skb_shinfo(skb)->frags, frags, i * sizeof(skb_frag_t)); | |
1086 | skb_shinfo(skb)->nr_frags = i; | |
1087 | skb->truesize += i * PAGE_SIZE; | |
e3377f36 ZK |
1088 | |
1089 | return 0; | |
1090 | } | |
b3f980bd | 1091 | |
e9ce7cb6 | 1092 | static int xenvif_tx_submit(struct xenvif_queue *queue) |
f942dc25 | 1093 | { |
e9ce7cb6 WL |
1094 | struct gnttab_map_grant_ref *gop_map = queue->tx_map_ops; |
1095 | struct gnttab_copy *gop_copy = queue->tx_copy_ops; | |
f942dc25 | 1096 | struct sk_buff *skb; |
b3f980bd | 1097 | int work_done = 0; |
f942dc25 | 1098 | |
e9ce7cb6 | 1099 | while ((skb = __skb_dequeue(&queue->tx_queue)) != NULL) { |
f942dc25 | 1100 | struct xen_netif_tx_request *txp; |
f942dc25 IC |
1101 | u16 pending_idx; |
1102 | unsigned data_len; | |
1103 | ||
8f13dd96 | 1104 | pending_idx = XENVIF_TX_CB(skb)->pending_idx; |
e9ce7cb6 | 1105 | txp = &queue->pending_tx_info[pending_idx].req; |
f942dc25 IC |
1106 | |
1107 | /* Check the remap error code. */ | |
e9ce7cb6 | 1108 | if (unlikely(xenvif_tx_check_gop(queue, skb, &gop_map, &gop_copy))) { |
b42cc6e4 ZK |
1109 | /* If there was an error, xenvif_tx_check_gop is |
1110 | * expected to release all the frags which were mapped, | |
1111 | * so kfree_skb shouldn't do it again | |
1112 | */ | |
f942dc25 | 1113 | skb_shinfo(skb)->nr_frags = 0; |
b42cc6e4 ZK |
1114 | if (skb_has_frag_list(skb)) { |
1115 | struct sk_buff *nskb = | |
1116 | skb_shinfo(skb)->frag_list; | |
1117 | skb_shinfo(nskb)->nr_frags = 0; | |
1118 | } | |
f942dc25 IC |
1119 | kfree_skb(skb); |
1120 | continue; | |
1121 | } | |
1122 | ||
1123 | data_len = skb->len; | |
e9ce7cb6 | 1124 | callback_param(queue, pending_idx).ctx = NULL; |
f942dc25 IC |
1125 | if (data_len < txp->size) { |
1126 | /* Append the packet payload as a fragment. */ | |
1127 | txp->offset += data_len; | |
1128 | txp->size -= data_len; | |
1129 | } else { | |
1130 | /* Schedule a response immediately. */ | |
e9ce7cb6 | 1131 | xenvif_idx_release(queue, pending_idx, |
bdab8275 | 1132 | XEN_NETIF_RSP_OKAY); |
f942dc25 IC |
1133 | } |
1134 | ||
1135 | if (txp->flags & XEN_NETTXF_csum_blank) | |
1136 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1137 | else if (txp->flags & XEN_NETTXF_data_validated) | |
1138 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1139 | ||
e9ce7cb6 | 1140 | xenvif_fill_frags(queue, skb); |
f942dc25 | 1141 | |
e3377f36 | 1142 | if (unlikely(skb_has_frag_list(skb))) { |
99e87f56 ID |
1143 | struct sk_buff *nskb = skb_shinfo(skb)->frag_list; |
1144 | xenvif_skb_zerocopy_prepare(queue, nskb); | |
e9ce7cb6 | 1145 | if (xenvif_handle_frag_list(queue, skb)) { |
e3377f36 | 1146 | if (net_ratelimit()) |
e9ce7cb6 | 1147 | netdev_err(queue->vif->dev, |
e3377f36 | 1148 | "Not enough memory to consolidate frag_list!\n"); |
a64bd934 | 1149 | xenvif_skb_zerocopy_prepare(queue, skb); |
e3377f36 ZK |
1150 | kfree_skb(skb); |
1151 | continue; | |
1152 | } | |
99e87f56 ID |
1153 | /* Copied all the bits from the frag list -- free it. */ |
1154 | skb_frag_list_init(skb); | |
1155 | kfree_skb(nskb); | |
e3377f36 ZK |
1156 | } |
1157 | ||
e9ce7cb6 | 1158 | skb->dev = queue->vif->dev; |
f942dc25 | 1159 | skb->protocol = eth_type_trans(skb, skb->dev); |
f9ca8f74 | 1160 | skb_reset_network_header(skb); |
f942dc25 | 1161 | |
e9ce7cb6 WL |
1162 | if (checksum_setup(queue, skb)) { |
1163 | netdev_dbg(queue->vif->dev, | |
f942dc25 | 1164 | "Can't setup checksum in net_tx_action\n"); |
f53c3fe8 ZK |
1165 | /* We have to set this flag to trigger the callback */ |
1166 | if (skb_shinfo(skb)->destructor_arg) | |
a64bd934 | 1167 | xenvif_skb_zerocopy_prepare(queue, skb); |
f942dc25 IC |
1168 | kfree_skb(skb); |
1169 | continue; | |
1170 | } | |
1171 | ||
d2aa125d | 1172 | skb_probe_transport_header(skb); |
f9ca8f74 | 1173 | |
b89587a7 PD |
1174 | /* If the packet is GSO then we will have just set up the |
1175 | * transport header offset in checksum_setup so it's now | |
1176 | * straightforward to calculate gso_segs. | |
1177 | */ | |
1178 | if (skb_is_gso(skb)) { | |
d2aa125d MM |
1179 | int mss, hdrlen; |
1180 | ||
1181 | /* GSO implies having the L4 header. */ | |
1182 | WARN_ON_ONCE(!skb_transport_header_was_set(skb)); | |
1183 | if (unlikely(!skb_transport_header_was_set(skb))) { | |
1184 | kfree_skb(skb); | |
1185 | continue; | |
1186 | } | |
1187 | ||
1188 | mss = skb_shinfo(skb)->gso_size; | |
1189 | hdrlen = skb_transport_header(skb) - | |
b89587a7 PD |
1190 | skb_mac_header(skb) + |
1191 | tcp_hdrlen(skb); | |
1192 | ||
1193 | skb_shinfo(skb)->gso_segs = | |
1194 | DIV_ROUND_UP(skb->len - hdrlen, mss); | |
1195 | } | |
1196 | ||
e9ce7cb6 WL |
1197 | queue->stats.rx_bytes += skb->len; |
1198 | queue->stats.rx_packets++; | |
f942dc25 | 1199 | |
b3f980bd WL |
1200 | work_done++; |
1201 | ||
f53c3fe8 ZK |
1202 | /* Set this flag right before netif_receive_skb, otherwise |
1203 | * someone might think this packet already left netback, and | |
1204 | * do a skb_copy_ubufs while we are still in control of the | |
1205 | * skb. E.g. the __pskb_pull_tail earlier can do such thing. | |
1206 | */ | |
1bb332af | 1207 | if (skb_shinfo(skb)->destructor_arg) { |
a64bd934 | 1208 | xenvif_skb_zerocopy_prepare(queue, skb); |
e9ce7cb6 | 1209 | queue->stats.tx_zerocopy_sent++; |
1bb332af | 1210 | } |
f53c3fe8 | 1211 | |
b3f980bd | 1212 | netif_receive_skb(skb); |
f942dc25 | 1213 | } |
b3f980bd WL |
1214 | |
1215 | return work_done; | |
f942dc25 IC |
1216 | } |
1217 | ||
3e2234b3 ZK |
1218 | void xenvif_zerocopy_callback(struct ubuf_info *ubuf, bool zerocopy_success) |
1219 | { | |
f53c3fe8 ZK |
1220 | unsigned long flags; |
1221 | pending_ring_idx_t index; | |
e9ce7cb6 | 1222 | struct xenvif_queue *queue = ubuf_to_queue(ubuf); |
f53c3fe8 ZK |
1223 | |
1224 | /* This is the only place where we grab this lock, to protect callbacks | |
1225 | * from each other. | |
1226 | */ | |
e9ce7cb6 | 1227 | spin_lock_irqsave(&queue->callback_lock, flags); |
f53c3fe8 ZK |
1228 | do { |
1229 | u16 pending_idx = ubuf->desc; | |
1230 | ubuf = (struct ubuf_info *) ubuf->ctx; | |
e9ce7cb6 | 1231 | BUG_ON(queue->dealloc_prod - queue->dealloc_cons >= |
f53c3fe8 | 1232 | MAX_PENDING_REQS); |
e9ce7cb6 WL |
1233 | index = pending_index(queue->dealloc_prod); |
1234 | queue->dealloc_ring[index] = pending_idx; | |
f53c3fe8 ZK |
1235 | /* Sync with xenvif_tx_dealloc_action: |
1236 | * insert idx then incr producer. | |
1237 | */ | |
1238 | smp_wmb(); | |
e9ce7cb6 | 1239 | queue->dealloc_prod++; |
f53c3fe8 | 1240 | } while (ubuf); |
e9ce7cb6 | 1241 | spin_unlock_irqrestore(&queue->callback_lock, flags); |
f53c3fe8 | 1242 | |
1bb332af | 1243 | if (likely(zerocopy_success)) |
e9ce7cb6 | 1244 | queue->stats.tx_zerocopy_success++; |
1bb332af | 1245 | else |
e9ce7cb6 | 1246 | queue->stats.tx_zerocopy_fail++; |
a64bd934 | 1247 | xenvif_skb_zerocopy_complete(queue); |
f53c3fe8 ZK |
1248 | } |
1249 | ||
e9ce7cb6 | 1250 | static inline void xenvif_tx_dealloc_action(struct xenvif_queue *queue) |
f53c3fe8 ZK |
1251 | { |
1252 | struct gnttab_unmap_grant_ref *gop; | |
1253 | pending_ring_idx_t dc, dp; | |
1254 | u16 pending_idx, pending_idx_release[MAX_PENDING_REQS]; | |
1255 | unsigned int i = 0; | |
1256 | ||
e9ce7cb6 WL |
1257 | dc = queue->dealloc_cons; |
1258 | gop = queue->tx_unmap_ops; | |
f53c3fe8 ZK |
1259 | |
1260 | /* Free up any grants we have finished using */ | |
1261 | do { | |
e9ce7cb6 | 1262 | dp = queue->dealloc_prod; |
f53c3fe8 ZK |
1263 | |
1264 | /* Ensure we see all indices enqueued by all | |
1265 | * xenvif_zerocopy_callback(). | |
1266 | */ | |
1267 | smp_rmb(); | |
1268 | ||
1269 | while (dc != dp) { | |
50c2e4dd | 1270 | BUG_ON(gop - queue->tx_unmap_ops >= MAX_PENDING_REQS); |
f53c3fe8 | 1271 | pending_idx = |
e9ce7cb6 | 1272 | queue->dealloc_ring[pending_index(dc++)]; |
f53c3fe8 | 1273 | |
50c2e4dd | 1274 | pending_idx_release[gop - queue->tx_unmap_ops] = |
f53c3fe8 | 1275 | pending_idx; |
50c2e4dd | 1276 | queue->pages_to_unmap[gop - queue->tx_unmap_ops] = |
e9ce7cb6 | 1277 | queue->mmap_pages[pending_idx]; |
f53c3fe8 | 1278 | gnttab_set_unmap_op(gop, |
e9ce7cb6 | 1279 | idx_to_kaddr(queue, pending_idx), |
f53c3fe8 | 1280 | GNTMAP_host_map, |
e9ce7cb6 WL |
1281 | queue->grant_tx_handle[pending_idx]); |
1282 | xenvif_grant_handle_reset(queue, pending_idx); | |
f53c3fe8 ZK |
1283 | ++gop; |
1284 | } | |
1285 | ||
e9ce7cb6 | 1286 | } while (dp != queue->dealloc_prod); |
f53c3fe8 | 1287 | |
e9ce7cb6 | 1288 | queue->dealloc_cons = dc; |
f53c3fe8 | 1289 | |
e9ce7cb6 | 1290 | if (gop - queue->tx_unmap_ops > 0) { |
f53c3fe8 | 1291 | int ret; |
e9ce7cb6 | 1292 | ret = gnttab_unmap_refs(queue->tx_unmap_ops, |
f53c3fe8 | 1293 | NULL, |
e9ce7cb6 WL |
1294 | queue->pages_to_unmap, |
1295 | gop - queue->tx_unmap_ops); | |
f53c3fe8 | 1296 | if (ret) { |
68946159 | 1297 | netdev_err(queue->vif->dev, "Unmap fail: nr_ops %tu ret %d\n", |
e9ce7cb6 WL |
1298 | gop - queue->tx_unmap_ops, ret); |
1299 | for (i = 0; i < gop - queue->tx_unmap_ops; ++i) { | |
f53c3fe8 | 1300 | if (gop[i].status != GNTST_okay) |
e9ce7cb6 | 1301 | netdev_err(queue->vif->dev, |
68946159 | 1302 | " host_addr: 0x%llx handle: 0x%x status: %d\n", |
f53c3fe8 ZK |
1303 | gop[i].host_addr, |
1304 | gop[i].handle, | |
1305 | gop[i].status); | |
1306 | } | |
1307 | BUG(); | |
1308 | } | |
1309 | } | |
1310 | ||
e9ce7cb6 WL |
1311 | for (i = 0; i < gop - queue->tx_unmap_ops; ++i) |
1312 | xenvif_idx_release(queue, pending_idx_release[i], | |
f53c3fe8 | 1313 | XEN_NETIF_RSP_OKAY); |
3e2234b3 ZK |
1314 | } |
1315 | ||
f53c3fe8 | 1316 | |
f942dc25 | 1317 | /* Called after netfront has transmitted */ |
e9ce7cb6 | 1318 | int xenvif_tx_action(struct xenvif_queue *queue, int budget) |
f942dc25 | 1319 | { |
bdab8275 | 1320 | unsigned nr_mops, nr_cops = 0; |
f53c3fe8 | 1321 | int work_done, ret; |
f942dc25 | 1322 | |
e9ce7cb6 | 1323 | if (unlikely(!tx_work_todo(queue))) |
b3f980bd WL |
1324 | return 0; |
1325 | ||
e9ce7cb6 | 1326 | xenvif_tx_build_gops(queue, budget, &nr_cops, &nr_mops); |
f942dc25 | 1327 | |
bdab8275 | 1328 | if (nr_cops == 0) |
b3f980bd WL |
1329 | return 0; |
1330 | ||
e9ce7cb6 | 1331 | gnttab_batch_copy(queue->tx_copy_ops, nr_cops); |
bdab8275 | 1332 | if (nr_mops != 0) { |
e9ce7cb6 | 1333 | ret = gnttab_map_refs(queue->tx_map_ops, |
bdab8275 | 1334 | NULL, |
e9ce7cb6 | 1335 | queue->pages_to_map, |
bdab8275 ZK |
1336 | nr_mops); |
1337 | BUG_ON(ret); | |
1338 | } | |
f942dc25 | 1339 | |
e9ce7cb6 | 1340 | work_done = xenvif_tx_submit(queue); |
f942dc25 | 1341 | |
b3f980bd | 1342 | return work_done; |
f942dc25 IC |
1343 | } |
1344 | ||
e9ce7cb6 | 1345 | static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx, |
7376419a | 1346 | u8 status) |
f942dc25 | 1347 | { |
f942dc25 | 1348 | struct pending_tx_info *pending_tx_info; |
f53c3fe8 | 1349 | pending_ring_idx_t index; |
f53c3fe8 | 1350 | unsigned long flags; |
2810e5b9 | 1351 | |
e9ce7cb6 | 1352 | pending_tx_info = &queue->pending_tx_info[pending_idx]; |
7fbb9d84 | 1353 | |
e9ce7cb6 | 1354 | spin_lock_irqsave(&queue->response_lock, flags); |
7fbb9d84 | 1355 | |
562abd39 PD |
1356 | make_tx_response(queue, &pending_tx_info->req, |
1357 | pending_tx_info->extra_count, status); | |
7fbb9d84 DV |
1358 | |
1359 | /* Release the pending index before pusing the Tx response so | |
1360 | * its available before a new Tx request is pushed by the | |
1361 | * frontend. | |
1362 | */ | |
1363 | index = pending_index(queue->pending_prod++); | |
e9ce7cb6 | 1364 | queue->pending_ring[index] = pending_idx; |
7fbb9d84 | 1365 | |
c8a4d299 | 1366 | push_tx_responses(queue); |
7fbb9d84 | 1367 | |
e9ce7cb6 | 1368 | spin_unlock_irqrestore(&queue->response_lock, flags); |
f942dc25 IC |
1369 | } |
1370 | ||
2810e5b9 | 1371 | |
e9ce7cb6 | 1372 | static void make_tx_response(struct xenvif_queue *queue, |
f942dc25 | 1373 | struct xen_netif_tx_request *txp, |
562abd39 | 1374 | unsigned int extra_count, |
f942dc25 IC |
1375 | s8 st) |
1376 | { | |
e9ce7cb6 | 1377 | RING_IDX i = queue->tx.rsp_prod_pvt; |
f942dc25 | 1378 | struct xen_netif_tx_response *resp; |
f942dc25 | 1379 | |
e9ce7cb6 | 1380 | resp = RING_GET_RESPONSE(&queue->tx, i); |
f942dc25 IC |
1381 | resp->id = txp->id; |
1382 | resp->status = st; | |
1383 | ||
562abd39 | 1384 | while (extra_count-- != 0) |
e9ce7cb6 | 1385 | RING_GET_RESPONSE(&queue->tx, ++i)->status = XEN_NETIF_RSP_NULL; |
f942dc25 | 1386 | |
e9ce7cb6 | 1387 | queue->tx.rsp_prod_pvt = ++i; |
f942dc25 IC |
1388 | } |
1389 | ||
c8a4d299 DV |
1390 | static void push_tx_responses(struct xenvif_queue *queue) |
1391 | { | |
1392 | int notify; | |
1393 | ||
1394 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->tx, notify); | |
1395 | if (notify) | |
1396 | notify_remote_via_irq(queue->tx_irq); | |
1397 | } | |
1398 | ||
e9ce7cb6 | 1399 | void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx) |
f53c3fe8 ZK |
1400 | { |
1401 | int ret; | |
1402 | struct gnttab_unmap_grant_ref tx_unmap_op; | |
1403 | ||
1404 | gnttab_set_unmap_op(&tx_unmap_op, | |
e9ce7cb6 | 1405 | idx_to_kaddr(queue, pending_idx), |
f53c3fe8 | 1406 | GNTMAP_host_map, |
e9ce7cb6 WL |
1407 | queue->grant_tx_handle[pending_idx]); |
1408 | xenvif_grant_handle_reset(queue, pending_idx); | |
f53c3fe8 ZK |
1409 | |
1410 | ret = gnttab_unmap_refs(&tx_unmap_op, NULL, | |
e9ce7cb6 | 1411 | &queue->mmap_pages[pending_idx], 1); |
7aceb47a | 1412 | if (ret) { |
e9ce7cb6 | 1413 | netdev_err(queue->vif->dev, |
68946159 | 1414 | "Unmap fail: ret: %d pending_idx: %d host_addr: %llx handle: 0x%x status: %d\n", |
7aceb47a ZK |
1415 | ret, |
1416 | pending_idx, | |
1417 | tx_unmap_op.host_addr, | |
1418 | tx_unmap_op.handle, | |
1419 | tx_unmap_op.status); | |
1420 | BUG(); | |
1421 | } | |
f53c3fe8 ZK |
1422 | } |
1423 | ||
e9ce7cb6 | 1424 | static inline int tx_work_todo(struct xenvif_queue *queue) |
f942dc25 | 1425 | { |
e9ce7cb6 | 1426 | if (likely(RING_HAS_UNCONSUMED_REQUESTS(&queue->tx))) |
f942dc25 IC |
1427 | return 1; |
1428 | ||
1429 | return 0; | |
1430 | } | |
1431 | ||
e9ce7cb6 | 1432 | static inline bool tx_dealloc_work_todo(struct xenvif_queue *queue) |
f53c3fe8 | 1433 | { |
e9ce7cb6 | 1434 | return queue->dealloc_cons != queue->dealloc_prod; |
f53c3fe8 ZK |
1435 | } |
1436 | ||
4e15ee2c | 1437 | void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue) |
f942dc25 | 1438 | { |
e9ce7cb6 WL |
1439 | if (queue->tx.sring) |
1440 | xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif), | |
1441 | queue->tx.sring); | |
1442 | if (queue->rx.sring) | |
1443 | xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif), | |
1444 | queue->rx.sring); | |
f942dc25 IC |
1445 | } |
1446 | ||
4e15ee2c PD |
1447 | int xenvif_map_frontend_data_rings(struct xenvif_queue *queue, |
1448 | grant_ref_t tx_ring_ref, | |
1449 | grant_ref_t rx_ring_ref) | |
f942dc25 | 1450 | { |
c9d63699 | 1451 | void *addr; |
f942dc25 IC |
1452 | struct xen_netif_tx_sring *txs; |
1453 | struct xen_netif_rx_sring *rxs; | |
1454 | ||
1455 | int err = -ENOMEM; | |
1456 | ||
e9ce7cb6 | 1457 | err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif), |
ccc9d90a | 1458 | &tx_ring_ref, 1, &addr); |
c9d63699 | 1459 | if (err) |
f942dc25 IC |
1460 | goto err; |
1461 | ||
c9d63699 | 1462 | txs = (struct xen_netif_tx_sring *)addr; |
d0089e8a | 1463 | BACK_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); |
f942dc25 | 1464 | |
e9ce7cb6 | 1465 | err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif), |
ccc9d90a | 1466 | &rx_ring_ref, 1, &addr); |
c9d63699 | 1467 | if (err) |
f942dc25 | 1468 | goto err; |
f942dc25 | 1469 | |
c9d63699 | 1470 | rxs = (struct xen_netif_rx_sring *)addr; |
d0089e8a | 1471 | BACK_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); |
f942dc25 IC |
1472 | |
1473 | return 0; | |
1474 | ||
1475 | err: | |
4e15ee2c | 1476 | xenvif_unmap_frontend_data_rings(queue); |
f942dc25 IC |
1477 | return err; |
1478 | } | |
1479 | ||
a64bd934 WL |
1480 | static bool xenvif_dealloc_kthread_should_stop(struct xenvif_queue *queue) |
1481 | { | |
1482 | /* Dealloc thread must remain running until all inflight | |
1483 | * packets complete. | |
1484 | */ | |
1485 | return kthread_should_stop() && | |
1486 | !atomic_read(&queue->inflight_packets); | |
1487 | } | |
1488 | ||
f53c3fe8 ZK |
1489 | int xenvif_dealloc_kthread(void *data) |
1490 | { | |
e9ce7cb6 | 1491 | struct xenvif_queue *queue = data; |
f53c3fe8 | 1492 | |
a64bd934 | 1493 | for (;;) { |
e9ce7cb6 WL |
1494 | wait_event_interruptible(queue->dealloc_wq, |
1495 | tx_dealloc_work_todo(queue) || | |
a64bd934 WL |
1496 | xenvif_dealloc_kthread_should_stop(queue)); |
1497 | if (xenvif_dealloc_kthread_should_stop(queue)) | |
f53c3fe8 ZK |
1498 | break; |
1499 | ||
e9ce7cb6 | 1500 | xenvif_tx_dealloc_action(queue); |
f53c3fe8 ZK |
1501 | cond_resched(); |
1502 | } | |
1503 | ||
1504 | /* Unmap anything remaining*/ | |
e9ce7cb6 WL |
1505 | if (tx_dealloc_work_todo(queue)) |
1506 | xenvif_tx_dealloc_action(queue); | |
f53c3fe8 ZK |
1507 | |
1508 | return 0; | |
1509 | } | |
1510 | ||
4e15ee2c PD |
1511 | static void make_ctrl_response(struct xenvif *vif, |
1512 | const struct xen_netif_ctrl_request *req, | |
1513 | u32 status, u32 data) | |
1514 | { | |
1515 | RING_IDX idx = vif->ctrl.rsp_prod_pvt; | |
1516 | struct xen_netif_ctrl_response rsp = { | |
1517 | .id = req->id, | |
1518 | .type = req->type, | |
1519 | .status = status, | |
1520 | .data = data, | |
1521 | }; | |
1522 | ||
1523 | *RING_GET_RESPONSE(&vif->ctrl, idx) = rsp; | |
1524 | vif->ctrl.rsp_prod_pvt = ++idx; | |
1525 | } | |
1526 | ||
1527 | static void push_ctrl_response(struct xenvif *vif) | |
1528 | { | |
1529 | int notify; | |
1530 | ||
1531 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&vif->ctrl, notify); | |
1532 | if (notify) | |
1533 | notify_remote_via_irq(vif->ctrl_irq); | |
1534 | } | |
1535 | ||
1536 | static void process_ctrl_request(struct xenvif *vif, | |
1537 | const struct xen_netif_ctrl_request *req) | |
1538 | { | |
40d8abde PD |
1539 | u32 status = XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED; |
1540 | u32 data = 0; | |
1541 | ||
1542 | switch (req->type) { | |
1543 | case XEN_NETIF_CTRL_TYPE_SET_HASH_ALGORITHM: | |
1544 | status = xenvif_set_hash_alg(vif, req->data[0]); | |
1545 | break; | |
1546 | ||
1547 | case XEN_NETIF_CTRL_TYPE_GET_HASH_FLAGS: | |
1548 | status = xenvif_get_hash_flags(vif, &data); | |
1549 | break; | |
1550 | ||
1551 | case XEN_NETIF_CTRL_TYPE_SET_HASH_FLAGS: | |
1552 | status = xenvif_set_hash_flags(vif, req->data[0]); | |
1553 | break; | |
1554 | ||
1555 | case XEN_NETIF_CTRL_TYPE_SET_HASH_KEY: | |
1556 | status = xenvif_set_hash_key(vif, req->data[0], | |
1557 | req->data[1]); | |
1558 | break; | |
1559 | ||
1560 | case XEN_NETIF_CTRL_TYPE_GET_HASH_MAPPING_SIZE: | |
1561 | status = XEN_NETIF_CTRL_STATUS_SUCCESS; | |
1562 | data = XEN_NETBK_MAX_HASH_MAPPING_SIZE; | |
1563 | break; | |
1564 | ||
1565 | case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING_SIZE: | |
1566 | status = xenvif_set_hash_mapping_size(vif, | |
1567 | req->data[0]); | |
1568 | break; | |
1569 | ||
1570 | case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING: | |
1571 | status = xenvif_set_hash_mapping(vif, req->data[0], | |
1572 | req->data[1], | |
1573 | req->data[2]); | |
1574 | break; | |
1575 | ||
1576 | default: | |
1577 | break; | |
1578 | } | |
1579 | ||
1580 | make_ctrl_response(vif, req, status, data); | |
4e15ee2c PD |
1581 | push_ctrl_response(vif); |
1582 | } | |
1583 | ||
1584 | static void xenvif_ctrl_action(struct xenvif *vif) | |
1585 | { | |
1586 | for (;;) { | |
1587 | RING_IDX req_prod, req_cons; | |
1588 | ||
1589 | req_prod = vif->ctrl.sring->req_prod; | |
1590 | req_cons = vif->ctrl.req_cons; | |
1591 | ||
1592 | /* Make sure we can see requests before we process them. */ | |
1593 | rmb(); | |
1594 | ||
1595 | if (req_cons == req_prod) | |
1596 | break; | |
1597 | ||
1598 | while (req_cons != req_prod) { | |
1599 | struct xen_netif_ctrl_request req; | |
1600 | ||
1601 | RING_COPY_REQUEST(&vif->ctrl, req_cons, &req); | |
1602 | req_cons++; | |
1603 | ||
1604 | process_ctrl_request(vif, &req); | |
1605 | } | |
1606 | ||
1607 | vif->ctrl.req_cons = req_cons; | |
1608 | vif->ctrl.sring->req_event = req_cons + 1; | |
1609 | } | |
1610 | } | |
1611 | ||
1612 | static bool xenvif_ctrl_work_todo(struct xenvif *vif) | |
1613 | { | |
1614 | if (likely(RING_HAS_UNCONSUMED_REQUESTS(&vif->ctrl))) | |
d3e2a25b | 1615 | return true; |
4e15ee2c | 1616 | |
d3e2a25b | 1617 | return false; |
4e15ee2c PD |
1618 | } |
1619 | ||
0364a882 | 1620 | irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data) |
4e15ee2c PD |
1621 | { |
1622 | struct xenvif *vif = data; | |
1623 | ||
0364a882 JG |
1624 | while (xenvif_ctrl_work_todo(vif)) |
1625 | xenvif_ctrl_action(vif); | |
4e15ee2c | 1626 | |
0364a882 | 1627 | return IRQ_HANDLED; |
4e15ee2c PD |
1628 | } |
1629 | ||
f942dc25 IC |
1630 | static int __init netback_init(void) |
1631 | { | |
f942dc25 | 1632 | int rc = 0; |
f942dc25 | 1633 | |
2a14b244 | 1634 | if (!xen_domain()) |
f942dc25 IC |
1635 | return -ENODEV; |
1636 | ||
56dd5af9 | 1637 | /* Allow as many queues as there are CPUs but max. 8 if user has not |
4c82ac3c WL |
1638 | * specified a value. |
1639 | */ | |
1640 | if (xenvif_max_queues == 0) | |
56dd5af9 JG |
1641 | xenvif_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, |
1642 | num_online_cpus()); | |
8d3d53b3 | 1643 | |
37641494 | 1644 | if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) { |
383eda32 JP |
1645 | pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n", |
1646 | fatal_skb_slots, XEN_NETBK_LEGACY_SLOTS_MAX); | |
37641494 | 1647 | fatal_skb_slots = XEN_NETBK_LEGACY_SLOTS_MAX; |
2810e5b9 WL |
1648 | } |
1649 | ||
f942dc25 IC |
1650 | rc = xenvif_xenbus_init(); |
1651 | if (rc) | |
1652 | goto failed_init; | |
1653 | ||
f51de243 ZK |
1654 | #ifdef CONFIG_DEBUG_FS |
1655 | xen_netback_dbg_root = debugfs_create_dir("xen-netback", NULL); | |
1656 | if (IS_ERR_OR_NULL(xen_netback_dbg_root)) | |
1657 | pr_warn("Init of debugfs returned %ld!\n", | |
1658 | PTR_ERR(xen_netback_dbg_root)); | |
1659 | #endif /* CONFIG_DEBUG_FS */ | |
1660 | ||
f942dc25 IC |
1661 | return 0; |
1662 | ||
1663 | failed_init: | |
f942dc25 | 1664 | return rc; |
f942dc25 IC |
1665 | } |
1666 | ||
1667 | module_init(netback_init); | |
1668 | ||
b103f358 WL |
1669 | static void __exit netback_fini(void) |
1670 | { | |
f51de243 | 1671 | #ifdef CONFIG_DEBUG_FS |
aad06d11 | 1672 | debugfs_remove_recursive(xen_netback_dbg_root); |
f51de243 | 1673 | #endif /* CONFIG_DEBUG_FS */ |
b103f358 | 1674 | xenvif_xenbus_fini(); |
b103f358 WL |
1675 | } |
1676 | module_exit(netback_fini); | |
1677 | ||
f942dc25 | 1678 | MODULE_LICENSE("Dual BSD/GPL"); |
f984cec6 | 1679 | MODULE_ALIAS("xen-backend:vif"); |