Commit | Line | Data |
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40d8abde PD |
1 | /* |
2 | * Copyright (c) 2016 Citrix Systems Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License version 2 | |
6 | * as published by the Free Softare Foundation; or, when distributed | |
7 | * separately from the Linux kernel or incorporated into other | |
8 | * software packages, subject to the following license: | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this source file (the "Software"), to deal in the Software without | |
12 | * restriction, including without limitation the rights to use, copy, modify, | |
13 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
14 | * and to permit persons to whom the Software is furnished to do so, subject to | |
15 | * the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
25 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
26 | * IN THE SOFTWARE. | |
27 | */ | |
28 | ||
29 | #define XEN_NETIF_DEFINE_TOEPLITZ | |
30 | ||
31 | #include "common.h" | |
32 | #include <linux/vmalloc.h> | |
33 | #include <linux/rculist.h> | |
34 | ||
40d8abde PD |
35 | static void xenvif_add_hash(struct xenvif *vif, const u8 *tag, |
36 | unsigned int len, u32 val) | |
37 | { | |
38 | struct xenvif_hash_cache_entry *new, *entry, *oldest; | |
39 | unsigned long flags; | |
40 | bool found; | |
41 | ||
9f674e48 | 42 | new = kmalloc(sizeof(*entry), GFP_ATOMIC); |
40d8abde PD |
43 | if (!new) |
44 | return; | |
45 | ||
46 | memcpy(new->tag, tag, len); | |
47 | new->len = len; | |
48 | new->val = val; | |
49 | ||
50 | spin_lock_irqsave(&vif->hash.cache.lock, flags); | |
51 | ||
52 | found = false; | |
53 | oldest = NULL; | |
f3265971 MB |
54 | list_for_each_entry_rcu(entry, &vif->hash.cache.list, link, |
55 | lockdep_is_held(&vif->hash.cache.lock)) { | |
40d8abde PD |
56 | /* Make sure we don't add duplicate entries */ |
57 | if (entry->len == len && | |
58 | memcmp(entry->tag, tag, len) == 0) | |
59 | found = true; | |
60 | if (!oldest || entry->seq < oldest->seq) | |
61 | oldest = entry; | |
62 | } | |
63 | ||
64 | if (!found) { | |
65 | new->seq = atomic_inc_return(&vif->hash.cache.seq); | |
66 | list_add_rcu(&new->link, &vif->hash.cache.list); | |
67 | ||
68 | if (++vif->hash.cache.count > xenvif_hash_cache_size) { | |
69 | list_del_rcu(&oldest->link); | |
70 | vif->hash.cache.count--; | |
1345b1ac | 71 | kfree_rcu(oldest, rcu); |
40d8abde PD |
72 | } |
73 | } | |
74 | ||
75 | spin_unlock_irqrestore(&vif->hash.cache.lock, flags); | |
76 | ||
77 | if (found) | |
78 | kfree(new); | |
79 | } | |
80 | ||
81 | static u32 xenvif_new_hash(struct xenvif *vif, const u8 *data, | |
82 | unsigned int len) | |
83 | { | |
84 | u32 val; | |
85 | ||
86 | val = xen_netif_toeplitz_hash(vif->hash.key, | |
87 | sizeof(vif->hash.key), | |
88 | data, len); | |
89 | ||
90 | if (xenvif_hash_cache_size != 0) | |
91 | xenvif_add_hash(vif, data, len, val); | |
92 | ||
93 | return val; | |
94 | } | |
95 | ||
96 | static void xenvif_flush_hash(struct xenvif *vif) | |
97 | { | |
98 | struct xenvif_hash_cache_entry *entry; | |
99 | unsigned long flags; | |
100 | ||
101 | if (xenvif_hash_cache_size == 0) | |
102 | return; | |
103 | ||
104 | spin_lock_irqsave(&vif->hash.cache.lock, flags); | |
105 | ||
f3265971 MB |
106 | list_for_each_entry_rcu(entry, &vif->hash.cache.list, link, |
107 | lockdep_is_held(&vif->hash.cache.lock)) { | |
40d8abde PD |
108 | list_del_rcu(&entry->link); |
109 | vif->hash.cache.count--; | |
1345b1ac | 110 | kfree_rcu(entry, rcu); |
40d8abde PD |
111 | } |
112 | ||
113 | spin_unlock_irqrestore(&vif->hash.cache.lock, flags); | |
114 | } | |
115 | ||
116 | static u32 xenvif_find_hash(struct xenvif *vif, const u8 *data, | |
117 | unsigned int len) | |
118 | { | |
119 | struct xenvif_hash_cache_entry *entry; | |
120 | u32 val; | |
121 | bool found; | |
122 | ||
123 | if (len >= XEN_NETBK_HASH_TAG_SIZE) | |
124 | return 0; | |
125 | ||
126 | if (xenvif_hash_cache_size == 0) | |
127 | return xenvif_new_hash(vif, data, len); | |
128 | ||
129 | rcu_read_lock(); | |
130 | ||
131 | found = false; | |
132 | ||
133 | list_for_each_entry_rcu(entry, &vif->hash.cache.list, link) { | |
134 | if (entry->len == len && | |
135 | memcmp(entry->tag, data, len) == 0) { | |
136 | val = entry->val; | |
137 | entry->seq = atomic_inc_return(&vif->hash.cache.seq); | |
138 | found = true; | |
139 | break; | |
140 | } | |
141 | } | |
142 | ||
143 | rcu_read_unlock(); | |
144 | ||
145 | if (!found) | |
146 | val = xenvif_new_hash(vif, data, len); | |
147 | ||
148 | return val; | |
149 | } | |
150 | ||
151 | void xenvif_set_skb_hash(struct xenvif *vif, struct sk_buff *skb) | |
152 | { | |
153 | struct flow_keys flow; | |
154 | u32 hash = 0; | |
155 | enum pkt_hash_types type = PKT_HASH_TYPE_NONE; | |
156 | u32 flags = vif->hash.flags; | |
157 | bool has_tcp_hdr; | |
158 | ||
159 | /* Quick rejection test: If the network protocol doesn't | |
160 | * correspond to any enabled hash type then there's no point | |
161 | * in parsing the packet header. | |
162 | */ | |
163 | switch (skb->protocol) { | |
164 | case htons(ETH_P_IP): | |
165 | if (flags & (XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP | | |
166 | XEN_NETIF_CTRL_HASH_TYPE_IPV4)) | |
167 | break; | |
168 | ||
169 | goto done; | |
170 | ||
171 | case htons(ETH_P_IPV6): | |
172 | if (flags & (XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP | | |
173 | XEN_NETIF_CTRL_HASH_TYPE_IPV6)) | |
174 | break; | |
175 | ||
176 | goto done; | |
177 | ||
178 | default: | |
179 | goto done; | |
180 | } | |
181 | ||
182 | memset(&flow, 0, sizeof(flow)); | |
183 | if (!skb_flow_dissect_flow_keys(skb, &flow, 0)) | |
184 | goto done; | |
185 | ||
186 | has_tcp_hdr = (flow.basic.ip_proto == IPPROTO_TCP) && | |
187 | !(flow.control.flags & FLOW_DIS_IS_FRAGMENT); | |
188 | ||
189 | switch (skb->protocol) { | |
190 | case htons(ETH_P_IP): | |
191 | if (has_tcp_hdr && | |
192 | (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP)) { | |
193 | u8 data[12]; | |
194 | ||
195 | memcpy(&data[0], &flow.addrs.v4addrs.src, 4); | |
196 | memcpy(&data[4], &flow.addrs.v4addrs.dst, 4); | |
197 | memcpy(&data[8], &flow.ports.src, 2); | |
198 | memcpy(&data[10], &flow.ports.dst, 2); | |
199 | ||
200 | hash = xenvif_find_hash(vif, data, sizeof(data)); | |
201 | type = PKT_HASH_TYPE_L4; | |
202 | } else if (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4) { | |
203 | u8 data[8]; | |
204 | ||
205 | memcpy(&data[0], &flow.addrs.v4addrs.src, 4); | |
206 | memcpy(&data[4], &flow.addrs.v4addrs.dst, 4); | |
207 | ||
208 | hash = xenvif_find_hash(vif, data, sizeof(data)); | |
209 | type = PKT_HASH_TYPE_L3; | |
210 | } | |
211 | ||
212 | break; | |
213 | ||
214 | case htons(ETH_P_IPV6): | |
215 | if (has_tcp_hdr && | |
216 | (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP)) { | |
217 | u8 data[36]; | |
218 | ||
219 | memcpy(&data[0], &flow.addrs.v6addrs.src, 16); | |
220 | memcpy(&data[16], &flow.addrs.v6addrs.dst, 16); | |
221 | memcpy(&data[32], &flow.ports.src, 2); | |
222 | memcpy(&data[34], &flow.ports.dst, 2); | |
223 | ||
224 | hash = xenvif_find_hash(vif, data, sizeof(data)); | |
225 | type = PKT_HASH_TYPE_L4; | |
226 | } else if (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6) { | |
227 | u8 data[32]; | |
228 | ||
229 | memcpy(&data[0], &flow.addrs.v6addrs.src, 16); | |
230 | memcpy(&data[16], &flow.addrs.v6addrs.dst, 16); | |
231 | ||
232 | hash = xenvif_find_hash(vif, data, sizeof(data)); | |
233 | type = PKT_HASH_TYPE_L3; | |
234 | } | |
235 | ||
236 | break; | |
237 | } | |
238 | ||
239 | done: | |
240 | if (type == PKT_HASH_TYPE_NONE) | |
241 | skb_clear_hash(skb); | |
242 | else | |
243 | __skb_set_sw_hash(skb, hash, type == PKT_HASH_TYPE_L4); | |
244 | } | |
245 | ||
246 | u32 xenvif_set_hash_alg(struct xenvif *vif, u32 alg) | |
247 | { | |
248 | switch (alg) { | |
249 | case XEN_NETIF_CTRL_HASH_ALGORITHM_NONE: | |
250 | case XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ: | |
251 | break; | |
252 | ||
253 | default: | |
254 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; | |
255 | } | |
256 | ||
257 | vif->hash.alg = alg; | |
258 | ||
259 | return XEN_NETIF_CTRL_STATUS_SUCCESS; | |
260 | } | |
261 | ||
262 | u32 xenvif_get_hash_flags(struct xenvif *vif, u32 *flags) | |
263 | { | |
264 | if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE) | |
265 | return XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED; | |
266 | ||
267 | *flags = XEN_NETIF_CTRL_HASH_TYPE_IPV4 | | |
268 | XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP | | |
269 | XEN_NETIF_CTRL_HASH_TYPE_IPV6 | | |
270 | XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP; | |
271 | ||
272 | return XEN_NETIF_CTRL_STATUS_SUCCESS; | |
273 | } | |
274 | ||
275 | u32 xenvif_set_hash_flags(struct xenvif *vif, u32 flags) | |
276 | { | |
277 | if (flags & ~(XEN_NETIF_CTRL_HASH_TYPE_IPV4 | | |
278 | XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP | | |
279 | XEN_NETIF_CTRL_HASH_TYPE_IPV6 | | |
280 | XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP)) | |
281 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; | |
282 | ||
283 | if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE) | |
284 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; | |
285 | ||
286 | vif->hash.flags = flags; | |
287 | ||
288 | return XEN_NETIF_CTRL_STATUS_SUCCESS; | |
289 | } | |
290 | ||
291 | u32 xenvif_set_hash_key(struct xenvif *vif, u32 gref, u32 len) | |
292 | { | |
293 | u8 *key = vif->hash.key; | |
294 | struct gnttab_copy copy_op = { | |
295 | .source.u.ref = gref, | |
296 | .source.domid = vif->domid, | |
297 | .dest.u.gmfn = virt_to_gfn(key), | |
298 | .dest.domid = DOMID_SELF, | |
299 | .dest.offset = xen_offset_in_page(key), | |
300 | .len = len, | |
301 | .flags = GNTCOPY_source_gref | |
302 | }; | |
303 | ||
304 | if (len > XEN_NETBK_MAX_HASH_KEY_SIZE) | |
305 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; | |
306 | ||
f86911e2 | 307 | if (copy_op.len != 0) { |
40d8abde PD |
308 | gnttab_batch_copy(©_op, 1); |
309 | ||
310 | if (copy_op.status != GNTST_okay) | |
311 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; | |
312 | } | |
313 | ||
314 | /* Clear any remaining key octets */ | |
315 | if (len < XEN_NETBK_MAX_HASH_KEY_SIZE) | |
316 | memset(key + len, 0, XEN_NETBK_MAX_HASH_KEY_SIZE - len); | |
317 | ||
318 | xenvif_flush_hash(vif); | |
319 | ||
320 | return XEN_NETIF_CTRL_STATUS_SUCCESS; | |
321 | } | |
322 | ||
323 | u32 xenvif_set_hash_mapping_size(struct xenvif *vif, u32 size) | |
324 | { | |
325 | if (size > XEN_NETBK_MAX_HASH_MAPPING_SIZE) | |
326 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; | |
327 | ||
328 | vif->hash.size = size; | |
22f9cde3 JB |
329 | memset(vif->hash.mapping[vif->hash.mapping_sel], 0, |
330 | sizeof(u32) * size); | |
40d8abde PD |
331 | |
332 | return XEN_NETIF_CTRL_STATUS_SUCCESS; | |
333 | } | |
334 | ||
335 | u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len, | |
336 | u32 off) | |
337 | { | |
22f9cde3 | 338 | u32 *mapping = vif->hash.mapping[!vif->hash.mapping_sel]; |
871088bf JB |
339 | unsigned int nr = 1; |
340 | struct gnttab_copy copy_op[2] = {{ | |
40d8abde PD |
341 | .source.u.ref = gref, |
342 | .source.domid = vif->domid, | |
40d8abde | 343 | .dest.domid = DOMID_SELF, |
780e83c2 | 344 | .len = len * sizeof(*mapping), |
40d8abde | 345 | .flags = GNTCOPY_source_gref |
871088bf | 346 | }}; |
40d8abde | 347 | |
780e83c2 JB |
348 | if ((off + len < off) || (off + len > vif->hash.size) || |
349 | len > XEN_PAGE_SIZE / sizeof(*mapping)) | |
40d8abde PD |
350 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; |
351 | ||
871088bf JB |
352 | copy_op[0].dest.u.gmfn = virt_to_gfn(mapping + off); |
353 | copy_op[0].dest.offset = xen_offset_in_page(mapping + off); | |
354 | if (copy_op[0].dest.offset + copy_op[0].len > XEN_PAGE_SIZE) { | |
355 | copy_op[1] = copy_op[0]; | |
356 | copy_op[1].source.offset = XEN_PAGE_SIZE - copy_op[0].dest.offset; | |
357 | copy_op[1].dest.u.gmfn = virt_to_gfn(mapping + off + len); | |
358 | copy_op[1].dest.offset = 0; | |
359 | copy_op[1].len = copy_op[0].len - copy_op[1].source.offset; | |
360 | copy_op[0].len = copy_op[1].source.offset; | |
361 | nr = 2; | |
362 | } | |
780e83c2 | 363 | |
22f9cde3 JB |
364 | memcpy(mapping, vif->hash.mapping[vif->hash.mapping_sel], |
365 | vif->hash.size * sizeof(*mapping)); | |
40d8abde | 366 | |
871088bf JB |
367 | if (copy_op[0].len != 0) { |
368 | gnttab_batch_copy(copy_op, nr); | |
40d8abde | 369 | |
871088bf JB |
370 | if (copy_op[0].status != GNTST_okay || |
371 | copy_op[nr - 1].status != GNTST_okay) | |
40d8abde PD |
372 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; |
373 | } | |
374 | ||
22f9cde3 JB |
375 | while (len-- != 0) |
376 | if (mapping[off++] >= vif->num_queues) | |
377 | return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER; | |
378 | ||
379 | vif->hash.mapping_sel = !vif->hash.mapping_sel; | |
380 | ||
40d8abde PD |
381 | return XEN_NETIF_CTRL_STATUS_SUCCESS; |
382 | } | |
383 | ||
a9339b8e PD |
384 | #ifdef CONFIG_DEBUG_FS |
385 | void xenvif_dump_hash_info(struct xenvif *vif, struct seq_file *m) | |
386 | { | |
387 | unsigned int i; | |
388 | ||
389 | switch (vif->hash.alg) { | |
390 | case XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ: | |
391 | seq_puts(m, "Hash Algorithm: TOEPLITZ\n"); | |
392 | break; | |
393 | ||
394 | case XEN_NETIF_CTRL_HASH_ALGORITHM_NONE: | |
395 | seq_puts(m, "Hash Algorithm: NONE\n"); | |
df561f66 | 396 | fallthrough; |
a9339b8e PD |
397 | default: |
398 | return; | |
399 | } | |
400 | ||
401 | if (vif->hash.flags) { | |
402 | seq_puts(m, "\nHash Flags:\n"); | |
403 | ||
404 | if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4) | |
405 | seq_puts(m, "- IPv4\n"); | |
406 | if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP) | |
407 | seq_puts(m, "- IPv4 + TCP\n"); | |
408 | if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6) | |
409 | seq_puts(m, "- IPv6\n"); | |
410 | if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP) | |
411 | seq_puts(m, "- IPv6 + TCP\n"); | |
412 | } | |
413 | ||
414 | seq_puts(m, "\nHash Key:\n"); | |
415 | ||
416 | for (i = 0; i < XEN_NETBK_MAX_HASH_KEY_SIZE; ) { | |
417 | unsigned int j, n; | |
418 | ||
419 | n = 8; | |
420 | if (i + n >= XEN_NETBK_MAX_HASH_KEY_SIZE) | |
421 | n = XEN_NETBK_MAX_HASH_KEY_SIZE - i; | |
422 | ||
423 | seq_printf(m, "[%2u - %2u]: ", i, i + n - 1); | |
424 | ||
425 | for (j = 0; j < n; j++, i++) | |
426 | seq_printf(m, "%02x ", vif->hash.key[i]); | |
427 | ||
428 | seq_puts(m, "\n"); | |
429 | } | |
430 | ||
431 | if (vif->hash.size != 0) { | |
22f9cde3 JB |
432 | const u32 *mapping = vif->hash.mapping[vif->hash.mapping_sel]; |
433 | ||
a9339b8e PD |
434 | seq_puts(m, "\nHash Mapping:\n"); |
435 | ||
436 | for (i = 0; i < vif->hash.size; ) { | |
437 | unsigned int j, n; | |
438 | ||
439 | n = 8; | |
440 | if (i + n >= vif->hash.size) | |
441 | n = vif->hash.size - i; | |
442 | ||
443 | seq_printf(m, "[%4u - %4u]: ", i, i + n - 1); | |
444 | ||
445 | for (j = 0; j < n; j++, i++) | |
22f9cde3 | 446 | seq_printf(m, "%4u ", mapping[i]); |
a9339b8e PD |
447 | |
448 | seq_puts(m, "\n"); | |
449 | } | |
450 | } | |
451 | } | |
452 | #endif /* CONFIG_DEBUG_FS */ | |
453 | ||
40d8abde PD |
454 | void xenvif_init_hash(struct xenvif *vif) |
455 | { | |
456 | if (xenvif_hash_cache_size == 0) | |
457 | return; | |
458 | ||
a2288d4e ID |
459 | BUG_ON(vif->hash.cache.count); |
460 | ||
40d8abde PD |
461 | spin_lock_init(&vif->hash.cache.lock); |
462 | INIT_LIST_HEAD(&vif->hash.cache.list); | |
463 | } | |
464 | ||
465 | void xenvif_deinit_hash(struct xenvif *vif) | |
466 | { | |
467 | xenvif_flush_hash(vif); | |
468 | } |