2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
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:
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
25 #include "netdev-dpdk.h"
31 enum OVS_PACKED_ENUM dp_packet_source {
32 DPBUF_MALLOC, /* Obtained via malloc(). */
33 DPBUF_STACK, /* Un-movable stack space or static buffer. */
34 DPBUF_STUB, /* Starts on stack, may expand into heap. */
35 DPBUF_DPDK, /* buffer data is from DPDK allocated memory.
36 ref to build_dp_packet() in netdev-dpdk. */
39 /* Buffer for holding arbitrary data. An dp_packet is automatically reallocated
40 * as necessary if it grows too large for the available memory.
42 * 'frame' and offset conventions:
44 * Network frames (aka "packets"): 'frame' MUST be set to the start of the
45 * packet, layer offsets MAY be set as appropriate for the packet.
46 * Additionally, we assume in many places that the 'frame' and 'data' are
47 * the same for packets.
49 * OpenFlow messages: 'frame' points to the start of the OpenFlow
50 * header, while 'l3_ofs' is the length of the OpenFlow header.
51 * When parsing, the 'data' will move past these, as data is being
52 * pulled from the OpenFlow message.
54 * Actions: When encoding OVS action lists, the 'frame' is used
55 * as a pointer to the beginning of the current action (see ofpact_put()).
57 * rconn: Reuses 'frame' as a private pointer while queuing.
61 struct rte_mbuf mbuf; /* DPDK mbuf */
63 void *base_; /* First byte of allocated space. */
64 void *data_; /* First byte actually in use. */
65 uint32_t size_; /* Number of bytes in use. */
66 uint32_t dp_hash; /* Packet hash. */
68 uint32_t allocated; /* Number of bytes allocated. */
70 void *frame; /* Packet frame start, or NULL. */
71 enum dp_packet_source source; /* Source of memory allocated as 'base'. */
72 uint8_t l2_pad_size; /* Detected l2 padding size.
73 * Padding is non-pullable. */
74 uint16_t l2_5_ofs; /* MPLS label stack offset from 'frame', or
76 uint16_t l3_ofs; /* Network-level header offset from 'frame',
78 uint16_t l4_ofs; /* Transport-level header offset from 'frame',
80 struct pkt_metadata md;
81 struct ovs_list list_node; /* Private list element for use by owner. */
84 static inline void * dp_packet_data(const struct dp_packet *);
85 static inline void dp_packet_set_data(struct dp_packet *, void *);
86 static inline void * dp_packet_base(const struct dp_packet *);
87 static inline void dp_packet_set_base(struct dp_packet *, void *);
89 static inline uint32_t dp_packet_size(const struct dp_packet *);
90 static inline void dp_packet_set_size(struct dp_packet *, uint32_t);
92 void * dp_packet_resize_l2(struct dp_packet *, int increment);
93 void * dp_packet_resize_l2_5(struct dp_packet *, int increment);
94 static inline void * dp_packet_l2(const struct dp_packet *);
95 static inline void dp_packet_set_frame(struct dp_packet *, void *);
96 static inline uint8_t dp_packet_l2_pad_size(const struct dp_packet *);
97 static inline void dp_packet_set_l2_pad_size(struct dp_packet *, uint8_t);
98 static inline void * dp_packet_l2_5(const struct dp_packet *);
99 static inline void dp_packet_set_l2_5(struct dp_packet *, void *);
100 static inline void * dp_packet_l3(const struct dp_packet *);
101 static inline void dp_packet_set_l3(struct dp_packet *, void *);
102 static inline void * dp_packet_l4(const struct dp_packet *);
103 static inline void dp_packet_set_l4(struct dp_packet *, void *);
104 static inline size_t dp_packet_l4_size(const struct dp_packet *);
105 static inline const void *dp_packet_get_tcp_payload(const struct dp_packet *);
106 static inline const void *dp_packet_get_udp_payload(const struct dp_packet *);
107 static inline const void *dp_packet_get_sctp_payload(const struct dp_packet *);
108 static inline const void *dp_packet_get_icmp_payload(const struct dp_packet *);
109 static inline const void *dp_packet_get_nd_payload(const struct dp_packet *);
111 void dp_packet_use(struct dp_packet *, void *, size_t);
112 void dp_packet_use_stub(struct dp_packet *, void *, size_t);
113 void dp_packet_use_const(struct dp_packet *, const void *, size_t);
115 void dp_packet_init_dpdk(struct dp_packet *b, size_t allocated);
117 void dp_packet_init(struct dp_packet *, size_t);
118 void dp_packet_uninit(struct dp_packet *);
119 static inline void *dp_packet_get_uninit_pointer(struct dp_packet *);
121 struct dp_packet *dp_packet_new(size_t);
122 struct dp_packet *dp_packet_new_with_headroom(size_t, size_t headroom);
123 struct dp_packet *dp_packet_clone(const struct dp_packet *);
124 struct dp_packet *dp_packet_clone_with_headroom(const struct dp_packet *,
126 struct dp_packet *dp_packet_clone_data(const void *, size_t);
127 struct dp_packet *dp_packet_clone_data_with_headroom(const void *, size_t,
129 static inline void dp_packet_delete(struct dp_packet *);
131 static inline void *dp_packet_at(const struct dp_packet *, size_t offset,
133 static inline void *dp_packet_at_assert(const struct dp_packet *, size_t offset,
135 static inline void *dp_packet_tail(const struct dp_packet *);
136 static inline void *dp_packet_end(const struct dp_packet *);
138 void *dp_packet_put_uninit(struct dp_packet *, size_t);
139 void *dp_packet_put_zeros(struct dp_packet *, size_t);
140 void *dp_packet_put(struct dp_packet *, const void *, size_t);
141 char *dp_packet_put_hex(struct dp_packet *, const char *s, size_t *n);
142 void dp_packet_reserve(struct dp_packet *, size_t);
143 void dp_packet_reserve_with_tailroom(struct dp_packet *b, size_t headroom,
145 void *dp_packet_push_uninit(struct dp_packet *b, size_t);
146 void *dp_packet_push_zeros(struct dp_packet *, size_t);
147 void *dp_packet_push(struct dp_packet *b, const void *, size_t);
149 static inline size_t dp_packet_headroom(const struct dp_packet *);
150 static inline size_t dp_packet_tailroom(const struct dp_packet *);
151 void dp_packet_prealloc_headroom(struct dp_packet *, size_t);
152 void dp_packet_prealloc_tailroom(struct dp_packet *, size_t);
153 void dp_packet_shift(struct dp_packet *, int);
155 static inline void dp_packet_clear(struct dp_packet *);
156 static inline void *dp_packet_pull(struct dp_packet *, size_t);
157 static inline void *dp_packet_try_pull(struct dp_packet *, size_t);
159 void *dp_packet_steal_data(struct dp_packet *);
161 char *dp_packet_to_string(const struct dp_packet *, size_t maxbytes);
162 static inline struct dp_packet *dp_packet_from_list(const struct ovs_list *);
163 void dp_packet_list_delete(struct ovs_list *);
164 static inline bool dp_packet_equal(const struct dp_packet *, const struct dp_packet *);
167 /* Returns a pointer that may be passed to free() to accomplish the same thing
168 * as dp_packet_uninit(b). The return value is a null pointer if dp_packet_uninit()
169 * would not free any memory. */
170 static inline void *dp_packet_get_uninit_pointer(struct dp_packet *b)
172 /* XXX: If 'source' is DPBUF_DPDK memory gets leaked! */
173 return b && b->source == DPBUF_MALLOC ? dp_packet_base(b) : NULL;
176 /* Frees memory that 'b' points to, as well as 'b' itself. */
177 static inline void dp_packet_delete(struct dp_packet *b)
180 if (b->source == DPBUF_DPDK) {
181 /* If this dp_packet was allocated by DPDK it must have been
182 * created as a dp_packet */
183 free_dpdk_buf((struct dp_packet*) b);
192 /* If 'b' contains at least 'offset + size' bytes of data, returns a pointer to
193 * byte 'offset'. Otherwise, returns a null pointer. */
194 static inline void *dp_packet_at(const struct dp_packet *b, size_t offset,
197 return offset + size <= dp_packet_size(b) ? (char *) dp_packet_data(b) + offset : NULL;
200 /* Returns a pointer to byte 'offset' in 'b', which must contain at least
201 * 'offset + size' bytes of data. */
202 static inline void *dp_packet_at_assert(const struct dp_packet *b, size_t offset,
205 ovs_assert(offset + size <= dp_packet_size(b));
206 return ((char *) dp_packet_data(b)) + offset;
209 /* Returns a pointer to byte following the last byte of data in use in 'b'. */
210 static inline void *dp_packet_tail(const struct dp_packet *b)
212 return (char *) dp_packet_data(b) + dp_packet_size(b);
215 /* Returns a pointer to byte following the last byte allocated for use (but
216 * not necessarily in use) in 'b'. */
217 static inline void *dp_packet_end(const struct dp_packet *b)
219 return (char *) dp_packet_base(b) + b->allocated;
222 /* Returns the number of bytes of headroom in 'b', that is, the number of bytes
223 * of unused space in dp_packet 'b' before the data that is in use. (Most
224 * commonly, the data in a dp_packet is at its beginning, and thus the dp_packet's
226 static inline size_t dp_packet_headroom(const struct dp_packet *b)
228 return (char*)dp_packet_data(b) - (char*)dp_packet_base(b);
231 /* Returns the number of bytes that may be appended to the tail end of dp_packet
232 * 'b' before the dp_packet must be reallocated. */
233 static inline size_t dp_packet_tailroom(const struct dp_packet *b)
235 return (char*)dp_packet_end(b) - (char*)dp_packet_tail(b);
238 /* Clears any data from 'b'. */
239 static inline void dp_packet_clear(struct dp_packet *b)
241 dp_packet_set_data(b, dp_packet_base(b));
242 dp_packet_set_size(b, 0);
245 /* Removes 'size' bytes from the head end of 'b', which must contain at least
246 * 'size' bytes of data. Returns the first byte of data removed. */
247 static inline void *dp_packet_pull(struct dp_packet *b, size_t size)
249 void *data = dp_packet_data(b);
250 ovs_assert(dp_packet_size(b) - dp_packet_l2_pad_size(b) >= size);
251 dp_packet_set_data(b, (char*)dp_packet_data(b) + size);
252 dp_packet_set_size(b, dp_packet_size(b) - size);
256 /* If 'b' has at least 'size' bytes of data, removes that many bytes from the
257 * head end of 'b' and returns the first byte removed. Otherwise, returns a
258 * null pointer without modifying 'b'. */
259 static inline void *dp_packet_try_pull(struct dp_packet *b, size_t size)
261 return dp_packet_size(b) - dp_packet_l2_pad_size(b) >= size
262 ? dp_packet_pull(b, size) : NULL;
265 static inline struct dp_packet *dp_packet_from_list(const struct ovs_list *list)
267 return CONTAINER_OF(list, struct dp_packet, list_node);
270 static inline bool dp_packet_equal(const struct dp_packet *a, const struct dp_packet *b)
272 return dp_packet_size(a) == dp_packet_size(b) &&
273 memcmp(dp_packet_data(a), dp_packet_data(b), dp_packet_size(a)) == 0;
276 /* Get the start if the Ethernet frame. 'l3_ofs' marks the end of the l2
277 * headers, so return NULL if it is not set. */
278 static inline void * dp_packet_l2(const struct dp_packet *b)
280 return (b->l3_ofs != UINT16_MAX) ? b->frame : NULL;
283 /* Sets the packet frame start pointer and resets all layer offsets.
284 * l3 offset must be set before 'l2' can be retrieved. */
285 static inline void dp_packet_set_frame(struct dp_packet *b, void *packet)
289 b->l2_5_ofs = UINT16_MAX;
290 b->l3_ofs = UINT16_MAX;
291 b->l4_ofs = UINT16_MAX;
294 static inline uint8_t dp_packet_l2_pad_size(const struct dp_packet *b)
296 return b->l2_pad_size;
299 static inline void dp_packet_set_l2_pad_size(struct dp_packet *b, uint8_t pad_size)
301 ovs_assert(pad_size <= dp_packet_size(b));
302 b->l2_pad_size = pad_size;
305 static inline void * dp_packet_l2_5(const struct dp_packet *b)
307 return b->l2_5_ofs != UINT16_MAX ? (char *)b->frame + b->l2_5_ofs : NULL;
310 static inline void dp_packet_set_l2_5(struct dp_packet *b, void *l2_5)
312 b->l2_5_ofs = l2_5 ? (char *)l2_5 - (char *)b->frame : UINT16_MAX;
315 static inline void * dp_packet_l3(const struct dp_packet *b)
317 return b->l3_ofs != UINT16_MAX ? (char *)b->frame + b->l3_ofs : NULL;
320 static inline void dp_packet_set_l3(struct dp_packet *b, void *l3)
322 b->l3_ofs = l3 ? (char *)l3 - (char *)b->frame : UINT16_MAX;
325 static inline void * dp_packet_l4(const struct dp_packet *b)
327 return b->l4_ofs != UINT16_MAX ? (char *)b->frame + b->l4_ofs : NULL;
330 static inline void dp_packet_set_l4(struct dp_packet *b, void *l4)
332 b->l4_ofs = l4 ? (char *)l4 - (char *)b->frame : UINT16_MAX;
335 static inline size_t dp_packet_l4_size(const struct dp_packet *b)
337 return b->l4_ofs != UINT16_MAX
338 ? (const char *)dp_packet_tail(b) - (const char *)dp_packet_l4(b)
339 - dp_packet_l2_pad_size(b)
343 static inline const void *dp_packet_get_tcp_payload(const struct dp_packet *b)
345 size_t l4_size = dp_packet_l4_size(b);
347 if (OVS_LIKELY(l4_size >= TCP_HEADER_LEN)) {
348 struct tcp_header *tcp = dp_packet_l4(b);
349 int tcp_len = TCP_OFFSET(tcp->tcp_ctl) * 4;
351 if (OVS_LIKELY(tcp_len >= TCP_HEADER_LEN && tcp_len <= l4_size)) {
352 return (const char *)tcp + tcp_len;
358 static inline const void *dp_packet_get_udp_payload(const struct dp_packet *b)
360 return OVS_LIKELY(dp_packet_l4_size(b) >= UDP_HEADER_LEN)
361 ? (const char *)dp_packet_l4(b) + UDP_HEADER_LEN : NULL;
364 static inline const void *dp_packet_get_sctp_payload(const struct dp_packet *b)
366 return OVS_LIKELY(dp_packet_l4_size(b) >= SCTP_HEADER_LEN)
367 ? (const char *)dp_packet_l4(b) + SCTP_HEADER_LEN : NULL;
370 static inline const void *dp_packet_get_icmp_payload(const struct dp_packet *b)
372 return OVS_LIKELY(dp_packet_l4_size(b) >= ICMP_HEADER_LEN)
373 ? (const char *)dp_packet_l4(b) + ICMP_HEADER_LEN : NULL;
376 static inline const void *dp_packet_get_nd_payload(const struct dp_packet *b)
378 return OVS_LIKELY(dp_packet_l4_size(b) >= ND_MSG_LEN)
379 ? (const char *)dp_packet_l4(b) + ND_MSG_LEN : NULL;
383 BUILD_ASSERT_DECL(offsetof(struct dp_packet, mbuf) == 0);
385 static inline void * dp_packet_data(const struct dp_packet *b)
387 return b->mbuf.pkt.data;
390 static inline void dp_packet_set_data(struct dp_packet *b, void *d)
392 b->mbuf.pkt.data = d;
395 static inline void * dp_packet_base(const struct dp_packet *b)
397 return b->mbuf.buf_addr;
400 static inline void dp_packet_set_base(struct dp_packet *b, void *d)
402 b->mbuf.buf_addr = d;
405 static inline uint32_t dp_packet_size(const struct dp_packet *b)
407 return b->mbuf.pkt.pkt_len;
410 static inline void dp_packet_set_size(struct dp_packet *b, uint32_t v)
412 b->mbuf.pkt.data_len = v; /* Current seg length. */
413 b->mbuf.pkt.pkt_len = v; /* Total length of all segments linked to
418 static inline void * dp_packet_data(const struct dp_packet *b)
423 static inline void dp_packet_set_data(struct dp_packet *b, void *d)
428 static inline void * dp_packet_base(const struct dp_packet *b)
433 static inline void dp_packet_set_base(struct dp_packet *b, void *d)
438 static inline uint32_t dp_packet_size(const struct dp_packet *b)
443 static inline void dp_packet_set_size(struct dp_packet *b, uint32_t v)
449 static inline void dp_packet_reset_packet(struct dp_packet *b, int off)
451 dp_packet_set_size(b, dp_packet_size(b) - off);
452 dp_packet_set_data(b, (void *) ((unsigned char *) b->frame + off));
454 b->l2_5_ofs = b->l3_ofs = b->l4_ofs = UINT16_MAX;
457 static inline uint32_t dp_packet_get_dp_hash(struct dp_packet *p)
460 return p->mbuf.pkt.hash.rss;
466 static inline void dp_packet_set_dp_hash(struct dp_packet *p,
470 p->mbuf.pkt.hash.rss = hash;
480 #endif /* dp-packet.h */