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91088554 | 1 | /* |
cf62fa4c | 2 | * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc. |
91088554 DDP |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
cf62fa4c PS |
18 | #include <stdlib.h> |
19 | #include <string.h> | |
20 | #include "dynamic-string.h" | |
21 | #include "netdev-dpdk.h" | |
e14deea0 | 22 | #include "dp-packet.h" |
cf62fa4c | 23 | #include "util.h" |
91088554 | 24 | |
cf62fa4c PS |
25 | static void |
26 | dp_packet_init__(struct dp_packet *b, size_t allocated, enum dp_packet_source source) | |
27 | { | |
28 | b->allocated = allocated; | |
29 | b->source = source; | |
30 | b->frame = NULL; | |
31 | b->l2_pad_size = 0; | |
32 | b->l2_5_ofs = b->l3_ofs = b->l4_ofs = UINT16_MAX; | |
33 | b->md = PKT_METADATA_INITIALIZER(0); | |
34 | list_poison(&b->list_node); | |
35 | } | |
36 | ||
37 | static void | |
38 | dp_packet_use__(struct dp_packet *b, void *base, size_t allocated, | |
39 | enum dp_packet_source source) | |
40 | { | |
41 | dp_packet_set_base(b, base); | |
42 | dp_packet_set_data(b, base); | |
43 | dp_packet_set_size(b, 0); | |
44 | ||
45 | dp_packet_init__(b, allocated, source); | |
46 | } | |
47 | ||
48 | /* Initializes 'b' as an empty dp_packet that contains the 'allocated' bytes of | |
49 | * memory starting at 'base'. 'base' should be the first byte of a region | |
50 | * obtained from malloc(). It will be freed (with free()) if 'b' is resized or | |
51 | * freed. */ | |
52 | void | |
53 | dp_packet_use(struct dp_packet *b, void *base, size_t allocated) | |
54 | { | |
55 | dp_packet_use__(b, base, allocated, DPBUF_MALLOC); | |
56 | } | |
57 | ||
58 | /* Initializes 'b' as an empty dp_packet that contains the 'allocated' bytes of | |
59 | * memory starting at 'base'. 'base' should point to a buffer on the stack. | |
60 | * (Nothing actually relies on 'base' being allocated on the stack. It could | |
61 | * be static or malloc()'d memory. But stack space is the most common use | |
62 | * case.) | |
63 | * | |
64 | * 'base' should be appropriately aligned. Using an array of uint32_t or | |
65 | * uint64_t for the buffer is a reasonable way to ensure appropriate alignment | |
66 | * for 32- or 64-bit data. | |
67 | * | |
68 | * An dp_packet operation that requires reallocating data will copy the provided | |
69 | * buffer into a malloc()'d buffer. Thus, it is wise to call dp_packet_uninit() | |
70 | * on an dp_packet initialized by this function, so that if it expanded into the | |
71 | * heap, that memory is freed. */ | |
72 | void | |
73 | dp_packet_use_stub(struct dp_packet *b, void *base, size_t allocated) | |
74 | { | |
75 | dp_packet_use__(b, base, allocated, DPBUF_STUB); | |
76 | } | |
77 | ||
78 | /* Initializes 'b' as an dp_packet whose data starts at 'data' and continues for | |
79 | * 'size' bytes. This is appropriate for an dp_packet that will be used to | |
80 | * inspect existing data, without moving it around or reallocating it, and | |
81 | * generally without modifying it at all. | |
82 | * | |
83 | * An dp_packet operation that requires reallocating data will assert-fail if this | |
84 | * function was used to initialize it. */ | |
85 | void | |
86 | dp_packet_use_const(struct dp_packet *b, const void *data, size_t size) | |
87 | { | |
88 | dp_packet_use__(b, CONST_CAST(void *, data), size, DPBUF_STACK); | |
89 | dp_packet_set_size(b, size); | |
90 | } | |
91 | ||
92 | /* Initializes 'b' as an empty dp_packet that contains the 'allocated' bytes of | |
93 | * memory starting at 'base'. DPDK allocated dp_packet and *data is allocated | |
94 | * from one continous memory region, so in memory data start right after | |
95 | * dp_packet. Therefore there is special method to free this type of | |
96 | * buffer. dp_packet base, data and size are initialized by dpdk rcv() so no | |
97 | * need to initialize those fields. */ | |
98 | void | |
99 | dp_packet_init_dpdk(struct dp_packet *b, size_t allocated) | |
100 | { | |
101 | dp_packet_init__(b, allocated, DPBUF_DPDK); | |
102 | } | |
103 | ||
104 | /* Initializes 'b' as an empty dp_packet with an initial capacity of 'size' | |
105 | * bytes. */ | |
106 | void | |
107 | dp_packet_init(struct dp_packet *b, size_t size) | |
108 | { | |
109 | dp_packet_use(b, size ? xmalloc(size) : NULL, size); | |
110 | } | |
111 | ||
112 | /* Frees memory that 'b' points to. */ | |
113 | void | |
114 | dp_packet_uninit(struct dp_packet *b) | |
115 | { | |
116 | if (b) { | |
117 | if (b->source == DPBUF_MALLOC) { | |
118 | free(dp_packet_base(b)); | |
119 | } else if (b->source == DPBUF_DPDK) { | |
120 | #ifdef DPDK_NETDEV | |
121 | /* If this dp_packet was allocated by DPDK it must have been | |
122 | * created as a dp_packet */ | |
123 | free_dpdk_buf((struct dp_packet*) b); | |
124 | #endif | |
125 | } | |
126 | } | |
127 | } | |
128 | ||
129 | /* Creates and returns a new dp_packet with an initial capacity of 'size' | |
130 | * bytes. */ | |
131 | struct dp_packet * | |
132 | dp_packet_new(size_t size) | |
133 | { | |
134 | struct dp_packet *b = xmalloc(sizeof *b); | |
135 | dp_packet_init(b, size); | |
136 | return b; | |
137 | } | |
91088554 | 138 | |
cf62fa4c PS |
139 | /* Creates and returns a new dp_packet with an initial capacity of 'size + |
140 | * headroom' bytes, reserving the first 'headroom' bytes as headroom. */ | |
e14deea0 PS |
141 | struct dp_packet * |
142 | dp_packet_new_with_headroom(size_t size, size_t headroom) | |
91088554 | 143 | { |
cf62fa4c PS |
144 | struct dp_packet *b = dp_packet_new(size + headroom); |
145 | dp_packet_reserve(b, headroom); | |
146 | return b; | |
147 | } | |
148 | ||
149 | /* Creates and returns a new dp_packet that initially contains a copy of the | |
150 | * 'dp_packet_size(buffer)' bytes of data starting at 'buffer->data' with no headroom or | |
151 | * tailroom. */ | |
152 | struct dp_packet * | |
153 | dp_packet_clone(const struct dp_packet *buffer) | |
154 | { | |
155 | return dp_packet_clone_with_headroom(buffer, 0); | |
156 | } | |
91088554 | 157 | |
cf62fa4c PS |
158 | /* Creates and returns a new dp_packet whose data are copied from 'buffer'. The |
159 | * returned dp_packet will additionally have 'headroom' bytes of headroom. */ | |
160 | struct dp_packet * | |
161 | dp_packet_clone_with_headroom(const struct dp_packet *buffer, size_t headroom) | |
162 | { | |
163 | struct dp_packet *new_buffer; | |
91088554 | 164 | |
cf62fa4c PS |
165 | new_buffer = dp_packet_clone_data_with_headroom(dp_packet_data(buffer), |
166 | dp_packet_size(buffer), | |
167 | headroom); | |
168 | if (buffer->frame) { | |
169 | uintptr_t data_delta | |
170 | = (char *)dp_packet_data(new_buffer) - (char *)dp_packet_data(buffer); | |
171 | ||
172 | new_buffer->frame = (char *) buffer->frame + data_delta; | |
173 | } | |
174 | new_buffer->l2_pad_size = buffer->l2_pad_size; | |
175 | new_buffer->l2_5_ofs = buffer->l2_5_ofs; | |
176 | new_buffer->l3_ofs = buffer->l3_ofs; | |
177 | new_buffer->l4_ofs = buffer->l4_ofs; | |
178 | new_buffer->md = buffer->md; | |
179 | ||
180 | return new_buffer; | |
181 | } | |
182 | ||
183 | /* Creates and returns a new dp_packet that initially contains a copy of the | |
184 | * 'size' bytes of data starting at 'data' with no headroom or tailroom. */ | |
185 | struct dp_packet * | |
186 | dp_packet_clone_data(const void *data, size_t size) | |
187 | { | |
188 | return dp_packet_clone_data_with_headroom(data, size, 0); | |
91088554 DDP |
189 | } |
190 | ||
cf62fa4c PS |
191 | /* Creates and returns a new dp_packet that initially contains 'headroom' bytes of |
192 | * headroom followed by a copy of the 'size' bytes of data starting at | |
193 | * 'data'. */ | |
e14deea0 | 194 | struct dp_packet * |
cf62fa4c | 195 | dp_packet_clone_data_with_headroom(const void *data, size_t size, size_t headroom) |
91088554 | 196 | { |
cf62fa4c PS |
197 | struct dp_packet *b = dp_packet_new_with_headroom(size, headroom); |
198 | dp_packet_put(b, data, size); | |
199 | return b; | |
200 | } | |
91088554 | 201 | |
cf62fa4c PS |
202 | static void |
203 | dp_packet_copy__(struct dp_packet *b, uint8_t *new_base, | |
204 | size_t new_headroom, size_t new_tailroom) | |
205 | { | |
206 | const uint8_t *old_base = dp_packet_base(b); | |
207 | size_t old_headroom = dp_packet_headroom(b); | |
208 | size_t old_tailroom = dp_packet_tailroom(b); | |
209 | size_t copy_headroom = MIN(old_headroom, new_headroom); | |
210 | size_t copy_tailroom = MIN(old_tailroom, new_tailroom); | |
91088554 | 211 | |
cf62fa4c PS |
212 | memcpy(&new_base[new_headroom - copy_headroom], |
213 | &old_base[old_headroom - copy_headroom], | |
214 | copy_headroom + dp_packet_size(b) + copy_tailroom); | |
215 | } | |
91088554 | 216 | |
cf62fa4c PS |
217 | /* Reallocates 'b' so that it has exactly 'new_headroom' and 'new_tailroom' |
218 | * bytes of headroom and tailroom, respectively. */ | |
219 | static void | |
220 | dp_packet_resize__(struct dp_packet *b, size_t new_headroom, size_t new_tailroom) | |
221 | { | |
222 | void *new_base, *new_data; | |
223 | size_t new_allocated; | |
224 | ||
225 | new_allocated = new_headroom + dp_packet_size(b) + new_tailroom; | |
226 | ||
227 | switch (b->source) { | |
228 | case DPBUF_DPDK: | |
229 | OVS_NOT_REACHED(); | |
230 | ||
231 | case DPBUF_MALLOC: | |
232 | if (new_headroom == dp_packet_headroom(b)) { | |
233 | new_base = xrealloc(dp_packet_base(b), new_allocated); | |
234 | } else { | |
235 | new_base = xmalloc(new_allocated); | |
236 | dp_packet_copy__(b, new_base, new_headroom, new_tailroom); | |
237 | free(dp_packet_base(b)); | |
238 | } | |
239 | break; | |
91088554 | 240 | |
cf62fa4c PS |
241 | case DPBUF_STACK: |
242 | OVS_NOT_REACHED(); | |
243 | ||
244 | case DPBUF_STUB: | |
245 | b->source = DPBUF_MALLOC; | |
246 | new_base = xmalloc(new_allocated); | |
247 | dp_packet_copy__(b, new_base, new_headroom, new_tailroom); | |
248 | break; | |
249 | ||
250 | default: | |
251 | OVS_NOT_REACHED(); | |
252 | } | |
253 | ||
254 | b->allocated = new_allocated; | |
255 | dp_packet_set_base(b, new_base); | |
256 | ||
257 | new_data = (char *) new_base + new_headroom; | |
258 | if (dp_packet_data(b) != new_data) { | |
259 | if (b->frame) { | |
260 | uintptr_t data_delta = (char *) new_data - (char *) dp_packet_data(b); | |
261 | ||
262 | b->frame = (char *) b->frame + data_delta; | |
263 | } | |
264 | dp_packet_set_data(b, new_data); | |
91088554 | 265 | } |
cf62fa4c | 266 | } |
91088554 | 267 | |
cf62fa4c PS |
268 | /* Ensures that 'b' has room for at least 'size' bytes at its tail end, |
269 | * reallocating and copying its data if necessary. Its headroom, if any, is | |
270 | * preserved. */ | |
271 | void | |
272 | dp_packet_prealloc_tailroom(struct dp_packet *b, size_t size) | |
273 | { | |
274 | if (size > dp_packet_tailroom(b)) { | |
275 | dp_packet_resize__(b, dp_packet_headroom(b), MAX(size, 64)); | |
276 | } | |
277 | } | |
278 | ||
279 | /* Ensures that 'b' has room for at least 'size' bytes at its head, | |
280 | * reallocating and copying its data if necessary. Its tailroom, if any, is | |
281 | * preserved. */ | |
282 | void | |
283 | dp_packet_prealloc_headroom(struct dp_packet *b, size_t size) | |
284 | { | |
285 | if (size > dp_packet_headroom(b)) { | |
286 | dp_packet_resize__(b, MAX(size, 64), dp_packet_tailroom(b)); | |
287 | } | |
288 | } | |
289 | ||
290 | /* Shifts all of the data within the allocated space in 'b' by 'delta' bytes. | |
291 | * For example, a 'delta' of 1 would cause each byte of data to move one byte | |
292 | * forward (from address 'p' to 'p+1'), and a 'delta' of -1 would cause each | |
293 | * byte to move one byte backward (from 'p' to 'p-1'). */ | |
294 | void | |
295 | dp_packet_shift(struct dp_packet *b, int delta) | |
296 | { | |
297 | ovs_assert(delta > 0 ? delta <= dp_packet_tailroom(b) | |
298 | : delta < 0 ? -delta <= dp_packet_headroom(b) | |
299 | : true); | |
300 | ||
301 | if (delta != 0) { | |
302 | char *dst = (char *) dp_packet_data(b) + delta; | |
303 | memmove(dst, dp_packet_data(b), dp_packet_size(b)); | |
304 | dp_packet_set_data(b, dst); | |
305 | } | |
306 | } | |
307 | ||
308 | /* Appends 'size' bytes of data to the tail end of 'b', reallocating and | |
309 | * copying its data if necessary. Returns a pointer to the first byte of the | |
310 | * new data, which is left uninitialized. */ | |
311 | void * | |
312 | dp_packet_put_uninit(struct dp_packet *b, size_t size) | |
313 | { | |
314 | void *p; | |
315 | dp_packet_prealloc_tailroom(b, size); | |
316 | p = dp_packet_tail(b); | |
317 | dp_packet_set_size(b, dp_packet_size(b) + size); | |
91088554 DDP |
318 | return p; |
319 | } | |
320 | ||
cf62fa4c PS |
321 | /* Appends 'size' zeroed bytes to the tail end of 'b'. Data in 'b' is |
322 | * reallocated and copied if necessary. Returns a pointer to the first byte of | |
323 | * the data's location in the dp_packet. */ | |
324 | void * | |
325 | dp_packet_put_zeros(struct dp_packet *b, size_t size) | |
326 | { | |
327 | void *dst = dp_packet_put_uninit(b, size); | |
328 | memset(dst, 0, size); | |
329 | return dst; | |
330 | } | |
331 | ||
332 | /* Appends the 'size' bytes of data in 'p' to the tail end of 'b'. Data in 'b' | |
333 | * is reallocated and copied if necessary. Returns a pointer to the first | |
334 | * byte of the data's location in the dp_packet. */ | |
335 | void * | |
336 | dp_packet_put(struct dp_packet *b, const void *p, size_t size) | |
337 | { | |
338 | void *dst = dp_packet_put_uninit(b, size); | |
339 | memcpy(dst, p, size); | |
340 | return dst; | |
341 | } | |
342 | ||
343 | /* Parses as many pairs of hex digits as possible (possibly separated by | |
344 | * spaces) from the beginning of 's', appending bytes for their values to 'b'. | |
345 | * Returns the first character of 's' that is not the first of a pair of hex | |
346 | * digits. If 'n' is nonnull, stores the number of bytes added to 'b' in | |
347 | * '*n'. */ | |
348 | char * | |
349 | dp_packet_put_hex(struct dp_packet *b, const char *s, size_t *n) | |
350 | { | |
351 | size_t initial_size = dp_packet_size(b); | |
352 | for (;;) { | |
353 | uint8_t byte; | |
354 | bool ok; | |
355 | ||
356 | s += strspn(s, " \t\r\n"); | |
357 | byte = hexits_value(s, 2, &ok); | |
358 | if (!ok) { | |
359 | if (n) { | |
360 | *n = dp_packet_size(b) - initial_size; | |
361 | } | |
362 | return CONST_CAST(char *, s); | |
363 | } | |
364 | ||
365 | dp_packet_put(b, &byte, 1); | |
366 | s += 2; | |
367 | } | |
368 | } | |
369 | ||
370 | /* Reserves 'size' bytes of headroom so that they can be later allocated with | |
371 | * dp_packet_push_uninit() without reallocating the dp_packet. */ | |
372 | void | |
373 | dp_packet_reserve(struct dp_packet *b, size_t size) | |
91088554 | 374 | { |
cf62fa4c PS |
375 | ovs_assert(!dp_packet_size(b)); |
376 | dp_packet_prealloc_tailroom(b, size); | |
377 | dp_packet_set_data(b, (char*)dp_packet_data(b) + size); | |
378 | } | |
91088554 | 379 | |
cf62fa4c PS |
380 | /* Reserves 'headroom' bytes at the head and 'tailroom' at the end so that |
381 | * they can be later allocated with dp_packet_push_uninit() or | |
382 | * dp_packet_put_uninit() without reallocating the dp_packet. */ | |
383 | void | |
384 | dp_packet_reserve_with_tailroom(struct dp_packet *b, size_t headroom, | |
385 | size_t tailroom) | |
386 | { | |
387 | ovs_assert(!dp_packet_size(b)); | |
388 | dp_packet_prealloc_tailroom(b, headroom + tailroom); | |
389 | dp_packet_set_data(b, (char*)dp_packet_data(b) + headroom); | |
390 | } | |
91088554 | 391 | |
cf62fa4c PS |
392 | /* Prefixes 'size' bytes to the head end of 'b', reallocating and copying its |
393 | * data if necessary. Returns a pointer to the first byte of the data's | |
394 | * location in the dp_packet. The new data is left uninitialized. */ | |
395 | void * | |
396 | dp_packet_push_uninit(struct dp_packet *b, size_t size) | |
397 | { | |
398 | dp_packet_prealloc_headroom(b, size); | |
399 | dp_packet_set_data(b, (char*)dp_packet_data(b) - size); | |
400 | dp_packet_set_size(b, dp_packet_size(b) + size); | |
401 | return dp_packet_data(b); | |
402 | } | |
8cbf4f47 | 403 | |
cf62fa4c PS |
404 | /* Prefixes 'size' zeroed bytes to the head end of 'b', reallocating and |
405 | * copying its data if necessary. Returns a pointer to the first byte of the | |
406 | * data's location in the dp_packet. */ | |
407 | void * | |
408 | dp_packet_push_zeros(struct dp_packet *b, size_t size) | |
409 | { | |
410 | void *dst = dp_packet_push_uninit(b, size); | |
411 | memset(dst, 0, size); | |
412 | return dst; | |
413 | } | |
414 | ||
415 | /* Copies the 'size' bytes starting at 'p' to the head end of 'b', reallocating | |
416 | * and copying its data if necessary. Returns a pointer to the first byte of | |
417 | * the data's location in the dp_packet. */ | |
418 | void * | |
419 | dp_packet_push(struct dp_packet *b, const void *p, size_t size) | |
420 | { | |
421 | void *dst = dp_packet_push_uninit(b, size); | |
422 | memcpy(dst, p, size); | |
423 | return dst; | |
424 | } | |
425 | ||
426 | /* Returns the data in 'b' as a block of malloc()'d memory and frees the buffer | |
427 | * within 'b'. (If 'b' itself was dynamically allocated, e.g. with | |
428 | * dp_packet_new(), then it should still be freed with, e.g., dp_packet_delete().) */ | |
429 | void * | |
430 | dp_packet_steal_data(struct dp_packet *b) | |
431 | { | |
432 | void *p; | |
433 | ovs_assert(b->source != DPBUF_DPDK); | |
434 | ||
435 | if (b->source == DPBUF_MALLOC && dp_packet_data(b) == dp_packet_base(b)) { | |
436 | p = dp_packet_data(b); | |
437 | } else { | |
438 | p = xmemdup(dp_packet_data(b), dp_packet_size(b)); | |
439 | if (b->source == DPBUF_MALLOC) { | |
440 | free(dp_packet_base(b)); | |
441 | } | |
442 | } | |
443 | dp_packet_set_base(b, NULL); | |
444 | dp_packet_set_data(b, NULL); | |
445 | return p; | |
446 | } | |
447 | ||
448 | /* Returns a string that describes some of 'b''s metadata plus a hex dump of up | |
449 | * to 'maxbytes' from the start of the buffer. */ | |
450 | char * | |
451 | dp_packet_to_string(const struct dp_packet *b, size_t maxbytes) | |
452 | { | |
453 | struct ds s; | |
454 | ||
455 | ds_init(&s); | |
456 | ds_put_format(&s, "size=%"PRIu32", allocated=%"PRIu32", head=%"PRIuSIZE", tail=%"PRIuSIZE"\n", | |
457 | dp_packet_size(b), b->allocated, | |
458 | dp_packet_headroom(b), dp_packet_tailroom(b)); | |
459 | ds_put_hex_dump(&s, dp_packet_data(b), MIN(dp_packet_size(b), maxbytes), 0, false); | |
460 | return ds_cstr(&s); | |
461 | } | |
462 | ||
463 | /* Removes each of the "struct dp_packet"s on 'list' from the list and frees | |
464 | * them. */ | |
465 | void | |
466 | dp_packet_list_delete(struct ovs_list *list) | |
467 | { | |
5f03c983 | 468 | struct dp_packet *b; |
cf62fa4c | 469 | |
5f03c983 | 470 | LIST_FOR_EACH_POP (b, list_node, list) { |
cf62fa4c PS |
471 | dp_packet_delete(b); |
472 | } | |
473 | } | |
474 | ||
475 | static inline void | |
476 | dp_packet_adjust_layer_offset(uint16_t *offset, int increment) | |
477 | { | |
478 | if (*offset != UINT16_MAX) { | |
479 | *offset += increment; | |
480 | } | |
481 | } | |
482 | ||
483 | /* Adjust the size of the l2_5 portion of the dp_packet, updating the l2 | |
484 | * pointer and the layer offsets. The caller is responsible for | |
485 | * modifying the contents. */ | |
486 | void * | |
487 | dp_packet_resize_l2_5(struct dp_packet *b, int increment) | |
488 | { | |
489 | if (increment >= 0) { | |
490 | dp_packet_push_uninit(b, increment); | |
491 | } else { | |
492 | dp_packet_pull(b, -increment); | |
493 | } | |
494 | ||
495 | b->frame = dp_packet_data(b); | |
496 | /* Adjust layer offsets after l2_5. */ | |
497 | dp_packet_adjust_layer_offset(&b->l3_ofs, increment); | |
498 | dp_packet_adjust_layer_offset(&b->l4_ofs, increment); | |
499 | ||
500 | return b->frame; | |
501 | } | |
502 | ||
503 | /* Adjust the size of the l2 portion of the dp_packet, updating the l2 | |
504 | * pointer and the layer offsets. The caller is responsible for | |
505 | * modifying the contents. */ | |
506 | void * | |
507 | dp_packet_resize_l2(struct dp_packet *b, int increment) | |
508 | { | |
509 | dp_packet_resize_l2_5(b, increment); | |
510 | dp_packet_adjust_layer_offset(&b->l2_5_ofs, increment); | |
511 | return b->frame; | |
91088554 | 512 | } |