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91088554 | 1 | /* |
91644f45 | 2 | * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2016 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> | |
01961bbd | 20 | |
e14deea0 | 21 | #include "dp-packet.h" |
0de1b425 | 22 | #include "netdev-afxdp.h" |
01961bbd DDP |
23 | #include "netdev-dpdk.h" |
24 | #include "openvswitch/dynamic-string.h" | |
cf62fa4c | 25 | #include "util.h" |
91088554 | 26 | |
cf62fa4c PS |
27 | static void |
28 | dp_packet_init__(struct dp_packet *b, size_t allocated, enum dp_packet_source source) | |
29 | { | |
11a6fbd5 | 30 | dp_packet_set_allocated(b, allocated); |
cf62fa4c | 31 | b->source = source; |
e496a484 | 32 | dp_packet_reset_offsets(b); |
35303d71 | 33 | pkt_metadata_init(&b->md, 0); |
aaca4fe0 | 34 | dp_packet_reset_cutlen(b); |
a47e2db2 IM |
35 | dp_packet_reset_offload(b); |
36 | /* Initialize implementation-specific fields of dp_packet. */ | |
37 | dp_packet_init_specific(b); | |
2482b0b0 JS |
38 | /* By default assume the packet type to be Ethernet. */ |
39 | b->packet_type = htonl(PT_ETH); | |
cf62fa4c PS |
40 | } |
41 | ||
42 | static void | |
43 | dp_packet_use__(struct dp_packet *b, void *base, size_t allocated, | |
44 | enum dp_packet_source source) | |
45 | { | |
46 | dp_packet_set_base(b, base); | |
47 | dp_packet_set_data(b, base); | |
48 | dp_packet_set_size(b, 0); | |
49 | ||
50 | dp_packet_init__(b, allocated, source); | |
51 | } | |
52 | ||
53 | /* Initializes 'b' as an empty dp_packet that contains the 'allocated' bytes of | |
54 | * memory starting at 'base'. 'base' should be the first byte of a region | |
55 | * obtained from malloc(). It will be freed (with free()) if 'b' is resized or | |
56 | * freed. */ | |
57 | void | |
58 | dp_packet_use(struct dp_packet *b, void *base, size_t allocated) | |
59 | { | |
60 | dp_packet_use__(b, base, allocated, DPBUF_MALLOC); | |
61 | } | |
62 | ||
0de1b425 WT |
63 | #if HAVE_AF_XDP |
64 | /* Initialize 'b' as an empty dp_packet that contains | |
65 | * memory starting at AF_XDP umem base. | |
66 | */ | |
67 | void | |
68 | dp_packet_use_afxdp(struct dp_packet *b, void *data, size_t allocated, | |
69 | size_t headroom) | |
70 | { | |
71 | dp_packet_set_base(b, (char *)data - headroom); | |
72 | dp_packet_set_data(b, data); | |
73 | dp_packet_set_size(b, 0); | |
74 | ||
75 | dp_packet_init__(b, allocated, DPBUF_AFXDP); | |
76 | } | |
77 | #endif | |
78 | ||
cf62fa4c PS |
79 | /* Initializes 'b' as an empty dp_packet that contains the 'allocated' bytes of |
80 | * memory starting at 'base'. 'base' should point to a buffer on the stack. | |
81 | * (Nothing actually relies on 'base' being allocated on the stack. It could | |
82 | * be static or malloc()'d memory. But stack space is the most common use | |
83 | * case.) | |
84 | * | |
85 | * 'base' should be appropriately aligned. Using an array of uint32_t or | |
86 | * uint64_t for the buffer is a reasonable way to ensure appropriate alignment | |
87 | * for 32- or 64-bit data. | |
88 | * | |
89 | * An dp_packet operation that requires reallocating data will copy the provided | |
90 | * buffer into a malloc()'d buffer. Thus, it is wise to call dp_packet_uninit() | |
91 | * on an dp_packet initialized by this function, so that if it expanded into the | |
92 | * heap, that memory is freed. */ | |
93 | void | |
94 | dp_packet_use_stub(struct dp_packet *b, void *base, size_t allocated) | |
95 | { | |
96 | dp_packet_use__(b, base, allocated, DPBUF_STUB); | |
97 | } | |
98 | ||
99 | /* Initializes 'b' as an dp_packet whose data starts at 'data' and continues for | |
100 | * 'size' bytes. This is appropriate for an dp_packet that will be used to | |
101 | * inspect existing data, without moving it around or reallocating it, and | |
102 | * generally without modifying it at all. | |
103 | * | |
104 | * An dp_packet operation that requires reallocating data will assert-fail if this | |
105 | * function was used to initialize it. */ | |
106 | void | |
107 | dp_packet_use_const(struct dp_packet *b, const void *data, size_t size) | |
108 | { | |
109 | dp_packet_use__(b, CONST_CAST(void *, data), size, DPBUF_STACK); | |
110 | dp_packet_set_size(b, size); | |
111 | } | |
112 | ||
3aaa6201 TL |
113 | /* Initializes 'b' as a DPDK dp-packet, which must have been allocated from a |
114 | * DPDK memory pool. */ | |
cf62fa4c | 115 | void |
3aaa6201 | 116 | dp_packet_init_dpdk(struct dp_packet *b) |
cf62fa4c | 117 | { |
11d4c7a8 | 118 | b->source = DPBUF_DPDK; |
cf62fa4c PS |
119 | } |
120 | ||
121 | /* Initializes 'b' as an empty dp_packet with an initial capacity of 'size' | |
122 | * bytes. */ | |
123 | void | |
124 | dp_packet_init(struct dp_packet *b, size_t size) | |
125 | { | |
126 | dp_packet_use(b, size ? xmalloc(size) : NULL, size); | |
127 | } | |
128 | ||
129 | /* Frees memory that 'b' points to. */ | |
130 | void | |
131 | dp_packet_uninit(struct dp_packet *b) | |
132 | { | |
133 | if (b) { | |
134 | if (b->source == DPBUF_MALLOC) { | |
135 | free(dp_packet_base(b)); | |
136 | } else if (b->source == DPBUF_DPDK) { | |
137 | #ifdef DPDK_NETDEV | |
138 | /* If this dp_packet was allocated by DPDK it must have been | |
139 | * created as a dp_packet */ | |
140 | free_dpdk_buf((struct dp_packet*) b); | |
141 | #endif | |
0de1b425 WT |
142 | } else if (b->source == DPBUF_AFXDP) { |
143 | free_afxdp_buf(b); | |
cf62fa4c PS |
144 | } |
145 | } | |
146 | } | |
147 | ||
148 | /* Creates and returns a new dp_packet with an initial capacity of 'size' | |
149 | * bytes. */ | |
150 | struct dp_packet * | |
151 | dp_packet_new(size_t size) | |
152 | { | |
153 | struct dp_packet *b = xmalloc(sizeof *b); | |
154 | dp_packet_init(b, size); | |
155 | return b; | |
156 | } | |
91088554 | 157 | |
cf62fa4c PS |
158 | /* Creates and returns a new dp_packet with an initial capacity of 'size + |
159 | * headroom' bytes, reserving the first 'headroom' bytes as headroom. */ | |
e14deea0 PS |
160 | struct dp_packet * |
161 | dp_packet_new_with_headroom(size_t size, size_t headroom) | |
91088554 | 162 | { |
cf62fa4c PS |
163 | struct dp_packet *b = dp_packet_new(size + headroom); |
164 | dp_packet_reserve(b, headroom); | |
165 | return b; | |
166 | } | |
167 | ||
168 | /* Creates and returns a new dp_packet that initially contains a copy of the | |
169 | * 'dp_packet_size(buffer)' bytes of data starting at 'buffer->data' with no headroom or | |
170 | * tailroom. */ | |
171 | struct dp_packet * | |
172 | dp_packet_clone(const struct dp_packet *buffer) | |
173 | { | |
174 | return dp_packet_clone_with_headroom(buffer, 0); | |
175 | } | |
91088554 | 176 | |
84b70576 FA |
177 | /* Creates and returns a new dp_packet whose data are copied from 'buffer'. |
178 | * The returned dp_packet will additionally have 'headroom' bytes of | |
179 | * headroom. */ | |
cf62fa4c PS |
180 | struct dp_packet * |
181 | dp_packet_clone_with_headroom(const struct dp_packet *buffer, size_t headroom) | |
182 | { | |
183 | struct dp_packet *new_buffer; | |
761398f8 | 184 | uint32_t mark; |
91088554 | 185 | |
cf62fa4c PS |
186 | new_buffer = dp_packet_clone_data_with_headroom(dp_packet_data(buffer), |
187 | dp_packet_size(buffer), | |
188 | headroom); | |
84b70576 FA |
189 | /* Copy the following fields into the returned buffer: l2_pad_size, |
190 | * l2_5_ofs, l3_ofs, l4_ofs, cutlen, packet_type and md. */ | |
191 | memcpy(&new_buffer->l2_pad_size, &buffer->l2_pad_size, | |
192 | sizeof(struct dp_packet) - | |
193 | offsetof(struct dp_packet, l2_pad_size)); | |
194 | ||
29bb3093 WT |
195 | *dp_packet_ol_flags_ptr(new_buffer) = *dp_packet_ol_flags_ptr(buffer); |
196 | *dp_packet_ol_flags_ptr(new_buffer) &= DP_PACKET_OL_SUPPORTED_MASK; | |
91644f45 | 197 | |
a47e2db2 IM |
198 | if (dp_packet_rss_valid(buffer)) { |
199 | dp_packet_set_rss_hash(new_buffer, dp_packet_get_rss_hash(buffer)); | |
91644f45 | 200 | } |
761398f8 IM |
201 | if (dp_packet_has_flow_mark(buffer, &mark)) { |
202 | dp_packet_set_flow_mark(new_buffer, mark); | |
203 | } | |
cf62fa4c PS |
204 | |
205 | return new_buffer; | |
206 | } | |
207 | ||
208 | /* Creates and returns a new dp_packet that initially contains a copy of the | |
209 | * 'size' bytes of data starting at 'data' with no headroom or tailroom. */ | |
210 | struct dp_packet * | |
211 | dp_packet_clone_data(const void *data, size_t size) | |
212 | { | |
213 | return dp_packet_clone_data_with_headroom(data, size, 0); | |
91088554 DDP |
214 | } |
215 | ||
cf62fa4c PS |
216 | /* Creates and returns a new dp_packet that initially contains 'headroom' bytes of |
217 | * headroom followed by a copy of the 'size' bytes of data starting at | |
218 | * 'data'. */ | |
e14deea0 | 219 | struct dp_packet * |
cf62fa4c | 220 | dp_packet_clone_data_with_headroom(const void *data, size_t size, size_t headroom) |
91088554 | 221 | { |
cf62fa4c PS |
222 | struct dp_packet *b = dp_packet_new_with_headroom(size, headroom); |
223 | dp_packet_put(b, data, size); | |
224 | return b; | |
225 | } | |
91088554 | 226 | |
cf62fa4c PS |
227 | static void |
228 | dp_packet_copy__(struct dp_packet *b, uint8_t *new_base, | |
229 | size_t new_headroom, size_t new_tailroom) | |
230 | { | |
231 | const uint8_t *old_base = dp_packet_base(b); | |
232 | size_t old_headroom = dp_packet_headroom(b); | |
233 | size_t old_tailroom = dp_packet_tailroom(b); | |
234 | size_t copy_headroom = MIN(old_headroom, new_headroom); | |
235 | size_t copy_tailroom = MIN(old_tailroom, new_tailroom); | |
91088554 | 236 | |
cf62fa4c PS |
237 | memcpy(&new_base[new_headroom - copy_headroom], |
238 | &old_base[old_headroom - copy_headroom], | |
239 | copy_headroom + dp_packet_size(b) + copy_tailroom); | |
240 | } | |
91088554 | 241 | |
cf62fa4c PS |
242 | /* Reallocates 'b' so that it has exactly 'new_headroom' and 'new_tailroom' |
243 | * bytes of headroom and tailroom, respectively. */ | |
73858f9d FL |
244 | void |
245 | dp_packet_resize(struct dp_packet *b, size_t new_headroom, size_t new_tailroom) | |
cf62fa4c PS |
246 | { |
247 | void *new_base, *new_data; | |
248 | size_t new_allocated; | |
249 | ||
250 | new_allocated = new_headroom + dp_packet_size(b) + new_tailroom; | |
251 | ||
252 | switch (b->source) { | |
253 | case DPBUF_DPDK: | |
254 | OVS_NOT_REACHED(); | |
255 | ||
256 | case DPBUF_MALLOC: | |
257 | if (new_headroom == dp_packet_headroom(b)) { | |
258 | new_base = xrealloc(dp_packet_base(b), new_allocated); | |
259 | } else { | |
260 | new_base = xmalloc(new_allocated); | |
261 | dp_packet_copy__(b, new_base, new_headroom, new_tailroom); | |
262 | free(dp_packet_base(b)); | |
263 | } | |
264 | break; | |
91088554 | 265 | |
cf62fa4c PS |
266 | case DPBUF_STACK: |
267 | OVS_NOT_REACHED(); | |
268 | ||
0de1b425 WT |
269 | case DPBUF_AFXDP: |
270 | OVS_NOT_REACHED(); | |
271 | ||
cf62fa4c PS |
272 | case DPBUF_STUB: |
273 | b->source = DPBUF_MALLOC; | |
274 | new_base = xmalloc(new_allocated); | |
275 | dp_packet_copy__(b, new_base, new_headroom, new_tailroom); | |
276 | break; | |
277 | ||
278 | default: | |
279 | OVS_NOT_REACHED(); | |
280 | } | |
281 | ||
11a6fbd5 | 282 | dp_packet_set_allocated(b, new_allocated); |
cf62fa4c PS |
283 | dp_packet_set_base(b, new_base); |
284 | ||
285 | new_data = (char *) new_base + new_headroom; | |
286 | if (dp_packet_data(b) != new_data) { | |
cf62fa4c | 287 | dp_packet_set_data(b, new_data); |
91088554 | 288 | } |
cf62fa4c | 289 | } |
91088554 | 290 | |
cf62fa4c PS |
291 | /* Ensures that 'b' has room for at least 'size' bytes at its tail end, |
292 | * reallocating and copying its data if necessary. Its headroom, if any, is | |
293 | * preserved. */ | |
294 | void | |
295 | dp_packet_prealloc_tailroom(struct dp_packet *b, size_t size) | |
296 | { | |
297 | if (size > dp_packet_tailroom(b)) { | |
73858f9d | 298 | dp_packet_resize(b, dp_packet_headroom(b), MAX(size, 64)); |
cf62fa4c PS |
299 | } |
300 | } | |
301 | ||
302 | /* Ensures that 'b' has room for at least 'size' bytes at its head, | |
303 | * reallocating and copying its data if necessary. Its tailroom, if any, is | |
304 | * preserved. */ | |
305 | void | |
306 | dp_packet_prealloc_headroom(struct dp_packet *b, size_t size) | |
307 | { | |
308 | if (size > dp_packet_headroom(b)) { | |
73858f9d | 309 | dp_packet_resize(b, MAX(size, 64), dp_packet_tailroom(b)); |
cf62fa4c PS |
310 | } |
311 | } | |
312 | ||
313 | /* Shifts all of the data within the allocated space in 'b' by 'delta' bytes. | |
314 | * For example, a 'delta' of 1 would cause each byte of data to move one byte | |
315 | * forward (from address 'p' to 'p+1'), and a 'delta' of -1 would cause each | |
316 | * byte to move one byte backward (from 'p' to 'p-1'). */ | |
317 | void | |
318 | dp_packet_shift(struct dp_packet *b, int delta) | |
319 | { | |
320 | ovs_assert(delta > 0 ? delta <= dp_packet_tailroom(b) | |
321 | : delta < 0 ? -delta <= dp_packet_headroom(b) | |
322 | : true); | |
323 | ||
324 | if (delta != 0) { | |
325 | char *dst = (char *) dp_packet_data(b) + delta; | |
326 | memmove(dst, dp_packet_data(b), dp_packet_size(b)); | |
327 | dp_packet_set_data(b, dst); | |
328 | } | |
329 | } | |
330 | ||
331 | /* Appends 'size' bytes of data to the tail end of 'b', reallocating and | |
332 | * copying its data if necessary. Returns a pointer to the first byte of the | |
333 | * new data, which is left uninitialized. */ | |
334 | void * | |
335 | dp_packet_put_uninit(struct dp_packet *b, size_t size) | |
336 | { | |
337 | void *p; | |
338 | dp_packet_prealloc_tailroom(b, size); | |
339 | p = dp_packet_tail(b); | |
340 | dp_packet_set_size(b, dp_packet_size(b) + size); | |
91088554 DDP |
341 | return p; |
342 | } | |
343 | ||
cf62fa4c PS |
344 | /* Appends 'size' zeroed bytes to the tail end of 'b'. Data in 'b' is |
345 | * reallocated and copied if necessary. Returns a pointer to the first byte of | |
346 | * the data's location in the dp_packet. */ | |
347 | void * | |
348 | dp_packet_put_zeros(struct dp_packet *b, size_t size) | |
349 | { | |
350 | void *dst = dp_packet_put_uninit(b, size); | |
351 | memset(dst, 0, size); | |
352 | return dst; | |
353 | } | |
354 | ||
355 | /* Appends the 'size' bytes of data in 'p' to the tail end of 'b'. Data in 'b' | |
356 | * is reallocated and copied if necessary. Returns a pointer to the first | |
357 | * byte of the data's location in the dp_packet. */ | |
358 | void * | |
359 | dp_packet_put(struct dp_packet *b, const void *p, size_t size) | |
360 | { | |
361 | void *dst = dp_packet_put_uninit(b, size); | |
362 | memcpy(dst, p, size); | |
363 | return dst; | |
364 | } | |
365 | ||
366 | /* Parses as many pairs of hex digits as possible (possibly separated by | |
367 | * spaces) from the beginning of 's', appending bytes for their values to 'b'. | |
368 | * Returns the first character of 's' that is not the first of a pair of hex | |
369 | * digits. If 'n' is nonnull, stores the number of bytes added to 'b' in | |
370 | * '*n'. */ | |
371 | char * | |
372 | dp_packet_put_hex(struct dp_packet *b, const char *s, size_t *n) | |
373 | { | |
374 | size_t initial_size = dp_packet_size(b); | |
375 | for (;;) { | |
376 | uint8_t byte; | |
377 | bool ok; | |
378 | ||
379 | s += strspn(s, " \t\r\n"); | |
380 | byte = hexits_value(s, 2, &ok); | |
381 | if (!ok) { | |
382 | if (n) { | |
383 | *n = dp_packet_size(b) - initial_size; | |
384 | } | |
385 | return CONST_CAST(char *, s); | |
386 | } | |
387 | ||
388 | dp_packet_put(b, &byte, 1); | |
389 | s += 2; | |
390 | } | |
391 | } | |
392 | ||
393 | /* Reserves 'size' bytes of headroom so that they can be later allocated with | |
394 | * dp_packet_push_uninit() without reallocating the dp_packet. */ | |
395 | void | |
396 | dp_packet_reserve(struct dp_packet *b, size_t size) | |
91088554 | 397 | { |
cf62fa4c PS |
398 | ovs_assert(!dp_packet_size(b)); |
399 | dp_packet_prealloc_tailroom(b, size); | |
400 | dp_packet_set_data(b, (char*)dp_packet_data(b) + size); | |
401 | } | |
91088554 | 402 | |
cf62fa4c PS |
403 | /* Reserves 'headroom' bytes at the head and 'tailroom' at the end so that |
404 | * they can be later allocated with dp_packet_push_uninit() or | |
405 | * dp_packet_put_uninit() without reallocating the dp_packet. */ | |
406 | void | |
407 | dp_packet_reserve_with_tailroom(struct dp_packet *b, size_t headroom, | |
408 | size_t tailroom) | |
409 | { | |
410 | ovs_assert(!dp_packet_size(b)); | |
411 | dp_packet_prealloc_tailroom(b, headroom + tailroom); | |
412 | dp_packet_set_data(b, (char*)dp_packet_data(b) + headroom); | |
413 | } | |
91088554 | 414 | |
cf62fa4c PS |
415 | /* Prefixes 'size' bytes to the head end of 'b', reallocating and copying its |
416 | * data if necessary. Returns a pointer to the first byte of the data's | |
417 | * location in the dp_packet. The new data is left uninitialized. */ | |
418 | void * | |
419 | dp_packet_push_uninit(struct dp_packet *b, size_t size) | |
420 | { | |
421 | dp_packet_prealloc_headroom(b, size); | |
422 | dp_packet_set_data(b, (char*)dp_packet_data(b) - size); | |
423 | dp_packet_set_size(b, dp_packet_size(b) + size); | |
424 | return dp_packet_data(b); | |
425 | } | |
8cbf4f47 | 426 | |
cf62fa4c PS |
427 | /* Prefixes 'size' zeroed bytes to the head end of 'b', reallocating and |
428 | * copying its data if necessary. Returns a pointer to the first byte of the | |
429 | * data's location in the dp_packet. */ | |
430 | void * | |
431 | dp_packet_push_zeros(struct dp_packet *b, size_t size) | |
432 | { | |
433 | void *dst = dp_packet_push_uninit(b, size); | |
434 | memset(dst, 0, size); | |
435 | return dst; | |
436 | } | |
437 | ||
438 | /* Copies the 'size' bytes starting at 'p' to the head end of 'b', reallocating | |
439 | * and copying its data if necessary. Returns a pointer to the first byte of | |
440 | * the data's location in the dp_packet. */ | |
441 | void * | |
442 | dp_packet_push(struct dp_packet *b, const void *p, size_t size) | |
443 | { | |
444 | void *dst = dp_packet_push_uninit(b, size); | |
445 | memcpy(dst, p, size); | |
446 | return dst; | |
447 | } | |
448 | ||
449 | /* Returns the data in 'b' as a block of malloc()'d memory and frees the buffer | |
450 | * within 'b'. (If 'b' itself was dynamically allocated, e.g. with | |
451 | * dp_packet_new(), then it should still be freed with, e.g., dp_packet_delete().) */ | |
452 | void * | |
453 | dp_packet_steal_data(struct dp_packet *b) | |
454 | { | |
455 | void *p; | |
456 | ovs_assert(b->source != DPBUF_DPDK); | |
0de1b425 | 457 | ovs_assert(b->source != DPBUF_AFXDP); |
cf62fa4c PS |
458 | |
459 | if (b->source == DPBUF_MALLOC && dp_packet_data(b) == dp_packet_base(b)) { | |
460 | p = dp_packet_data(b); | |
461 | } else { | |
462 | p = xmemdup(dp_packet_data(b), dp_packet_size(b)); | |
463 | if (b->source == DPBUF_MALLOC) { | |
464 | free(dp_packet_base(b)); | |
465 | } | |
466 | } | |
467 | dp_packet_set_base(b, NULL); | |
468 | dp_packet_set_data(b, NULL); | |
469 | return p; | |
470 | } | |
471 | ||
cf62fa4c PS |
472 | static inline void |
473 | dp_packet_adjust_layer_offset(uint16_t *offset, int increment) | |
474 | { | |
475 | if (*offset != UINT16_MAX) { | |
476 | *offset += increment; | |
477 | } | |
478 | } | |
479 | ||
480 | /* Adjust the size of the l2_5 portion of the dp_packet, updating the l2 | |
481 | * pointer and the layer offsets. The caller is responsible for | |
482 | * modifying the contents. */ | |
483 | void * | |
484 | dp_packet_resize_l2_5(struct dp_packet *b, int increment) | |
485 | { | |
486 | if (increment >= 0) { | |
487 | dp_packet_push_uninit(b, increment); | |
488 | } else { | |
489 | dp_packet_pull(b, -increment); | |
490 | } | |
491 | ||
cf62fa4c PS |
492 | /* Adjust layer offsets after l2_5. */ |
493 | dp_packet_adjust_layer_offset(&b->l3_ofs, increment); | |
494 | dp_packet_adjust_layer_offset(&b->l4_ofs, increment); | |
495 | ||
82eb5b0a | 496 | return dp_packet_data(b); |
cf62fa4c PS |
497 | } |
498 | ||
499 | /* Adjust the size of the l2 portion of the dp_packet, updating the l2 | |
500 | * pointer and the layer offsets. The caller is responsible for | |
501 | * modifying the contents. */ | |
502 | void * | |
503 | dp_packet_resize_l2(struct dp_packet *b, int increment) | |
504 | { | |
505 | dp_packet_resize_l2_5(b, increment); | |
506 | dp_packet_adjust_layer_offset(&b->l2_5_ofs, increment); | |
82eb5b0a | 507 | return dp_packet_data(b); |
91088554 | 508 | } |