2 * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2012 Julien Desfossez <julien.desfossez@efficios.com>
5 * SPDX-License-Identifier: GPL-2.0-only
12 #include <common/compiler.hpp>
13 #include <common/defaults.hpp>
14 #include <common/index/ctf-index.hpp>
15 #include <common/macros.hpp>
16 #include <common/optional.hpp>
17 #include <common/uuid.hpp>
19 #include <lttng/lttng.h>
24 #define RELAYD_VERSION_COMM_MAJOR VERSION_MAJOR
25 #define RELAYD_VERSION_COMM_MINOR VERSION_MINOR
27 #define RELAYD_COMM_LTTNG_HOST_NAME_MAX_2_4 64
28 #define RELAYD_COMM_LTTNG_NAME_MAX_2_4 255
29 #define RELAYD_COMM_LTTNG_PATH_MAX 4096
30 #define RELAYD_COMM_DEFAULT_STREAM_NAME_LEN 264 /* 256 + 8 */
33 * lttng-relayd communication header.
35 struct lttcomm_relayd_hdr {
36 /* Circuit ID not used for now so always ignored */
38 uint64_t data_size; /* data size following this header */
39 uint32_t cmd; /* enum lttcomm_relayd_command */
40 uint32_t cmd_version; /* command version */
44 * lttng-relayd data header.
46 struct lttcomm_relayd_data_hdr {
47 /* Circuit ID not used for now so always ignored */
49 uint64_t stream_id; /* Stream ID known by the relayd */
50 uint64_t net_seq_num; /* Network sequence number, per stream. */
51 uint32_t data_size; /* data size following this header */
52 uint32_t padding_size; /* Size of 0 padding the data */
56 * Reply from a create session command.
58 struct lttcomm_relayd_status_session {
64 * Used to add a stream on the relay daemon.
66 struct lttcomm_relayd_add_stream {
67 char channel_name[RELAYD_COMM_DEFAULT_STREAM_NAME_LEN];
68 char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
72 * Used to add a stream on the relay daemon.
73 * Protocol version 2.2
75 struct lttcomm_relayd_add_stream_2_2 {
76 char channel_name[RELAYD_COMM_DEFAULT_STREAM_NAME_LEN];
77 char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
78 uint64_t tracefile_size;
79 uint64_t tracefile_count;
82 struct lttcomm_relayd_add_stream_2_11 {
83 uint32_t channel_name_len;
84 uint32_t pathname_len;
85 uint64_t tracefile_size;
86 uint64_t tracefile_count;
87 uint64_t trace_chunk_id;
88 char names[LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH];
92 * Answer from an add stream command.
94 struct lttcomm_relayd_status_stream {
100 * Used to return command code for command not needing special data.
102 struct lttcomm_relayd_generic_reply {
109 struct lttcomm_relayd_version {
115 * Metadata payload used when metadata command is sent.
117 struct lttcomm_relayd_metadata_payload {
119 uint32_t padding_size;
124 * Used to indicate that a specific stream id can now be closed.
126 struct lttcomm_relayd_close_stream {
128 uint64_t last_net_seq_num; /* sequence number of last packet */
132 * Used to test if for a given stream id the data is pending on the relayd side
135 struct lttcomm_relayd_data_pending {
137 uint64_t last_net_seq_num; /* Sequence number of the last packet */
140 struct lttcomm_relayd_begin_data_pending {
144 struct lttcomm_relayd_end_data_pending {
148 struct lttcomm_relayd_quiescent_control {
155 struct lttcomm_relayd_index {
156 uint64_t relay_stream_id;
157 uint64_t net_seq_num;
158 uint64_t packet_size;
159 uint64_t content_size;
160 uint64_t timestamp_begin;
161 uint64_t timestamp_end;
162 uint64_t events_discarded;
165 uint64_t stream_instance_id;
166 uint64_t packet_seq_num;
169 static inline size_t lttcomm_relayd_index_len(uint32_t major, uint32_t minor)
174 return offsetof(struct lttcomm_relayd_index, stream_id) +
175 member_sizeof(struct lttcomm_relayd_index, stream_id);
177 return offsetof(struct lttcomm_relayd_index, packet_seq_num) +
178 member_sizeof(struct lttcomm_relayd_index, packet_seq_num);
187 * Create session in 2.4 adds additionnal parameters for live reading.
189 struct lttcomm_relayd_create_session_2_4 {
190 char session_name[RELAYD_COMM_LTTNG_NAME_MAX_2_4];
191 char hostname[RELAYD_COMM_LTTNG_HOST_NAME_MAX_2_4];
196 struct lttcomm_relayd_create_session_2_11 {
197 uint32_t session_name_len;
198 uint32_t hostname_len;
199 /* Optional, set to 0 to indicate it is not user-specified. */
200 uint32_t base_path_len;
203 uint8_t session_name_contains_creation_time;
204 /* Sessiond instance UUID */
205 uint8_t sessiond_uuid[LTTNG_UUID_LEN];
206 /* Sessiond session id */
208 /* Session creation time, in seconds since UNIX Epoch. */
209 uint64_t creation_time;
210 LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED current_chunk_id;
211 /* Contains the session_name, hostname, base_path. */
212 char names[LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH];
215 struct lttcomm_relayd_create_session_reply_2_11 {
216 struct lttcomm_relayd_status_session generic;
217 /* Includes the '\0' terminator. */
218 uint32_t output_path_length;
219 char output_path[LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH];
223 * Used to ask the relay to reset the metadata trace file (regeneration).
224 * Send the new version of the metadata (starts at 0).
226 struct lttcomm_relayd_reset_metadata {
231 struct lttcomm_relayd_stream_rotation_position {
234 * Sequence number of the first packet belonging to the new
235 * "destination" trace chunk to which the stream is rotating.
237 * Ignored for metadata streams.
239 uint64_t rotate_at_seq_num;
243 * For certain releases, the LTTNG_PACKED annotation was missing on the
244 * `new_chunk_id` field which causes padding to be added between the
245 * "optional" structure's `is_set` and `value` fields.
247 * Three alignment cases are handled:
248 * - `value` is aligned to the next byte boundary after `is_set`
249 * no padding is produced, see
250 * `struct lttcomm_relayd_rotate_streams_packed`,
251 * - `value` is aligned to the next 4-byte boundary after `is_set`
252 * (e.g. x86), 3 bytes of padding are produced, see
253 * `struct lttcomm_relayd_rotate_streams_3_bytes_padding`,
254 * - `value` is aligned to the next 8-byte boundary after `is_set`
255 * (e.g. x86-64), 7 bytes of padding are produced, see
256 * `struct lttcomm_relayd_rotate_streams_7_bytes_padding`.
258 * Note that since this structure's advertised size is used to determine
259 * the size of the padding it includes, it can't be extended with new
260 * optional fields. A new command would be needed.
262 struct lttcomm_relayd_rotate_streams {
263 uint32_t stream_count;
265 * Streams can be rotated outside of a chunk but not be parented to
268 * Improperly packed, but left as-is for backwards compatibility
269 * with unpatched relay daemons.
271 LTTNG_OPTIONAL_COMM(uint64_t) new_chunk_id;
272 /* `stream_count` positions follow. */
273 struct lttcomm_relayd_stream_rotation_position rotation_positions[];
276 struct lttcomm_relayd_rotate_streams_packed {
277 uint32_t stream_count;
278 LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED new_chunk_id;
279 struct lttcomm_relayd_stream_rotation_position rotation_positions[];
282 struct lttcomm_relayd_rotate_streams_3_bytes_padding {
283 uint32_t stream_count;
290 } LTTNG_PACKED new_chunk_id;
291 struct lttcomm_relayd_stream_rotation_position rotation_positions[];
294 struct lttcomm_relayd_rotate_streams_7_bytes_padding {
295 uint32_t stream_count;
302 } LTTNG_PACKED new_chunk_id;
303 struct lttcomm_relayd_stream_rotation_position rotation_positions[];
306 struct lttcomm_relayd_create_trace_chunk {
308 /* Seconds since EPOCH. */
309 uint64_t creation_timestamp;
310 /* Includes trailing NULL. */
311 uint32_t override_name_length;
312 char override_name[LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH];
315 struct lttcomm_relayd_close_trace_chunk {
317 /* Seconds since EPOCH. */
318 uint64_t close_timestamp;
319 /* enum lttng_trace_chunk_command_type */
320 LTTNG_OPTIONAL_COMM(uint32_t) LTTNG_PACKED close_command;
323 struct lttcomm_relayd_close_trace_chunk_reply {
324 struct lttcomm_relayd_generic_reply generic;
325 /* Includes trailing NULL. */
326 uint32_t path_length;
327 char path[LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH];
330 struct lttcomm_relayd_trace_chunk_exists {
334 struct lttcomm_relayd_trace_chunk_exists_reply {
335 struct lttcomm_relayd_generic_reply generic;
336 uint8_t trace_chunk_exists;
339 enum lttcomm_relayd_configuration_flag {
340 /* The relay daemon (2.12) is configured to allow clear operations. */
341 LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED = (1 << 0),
344 struct lttcomm_relayd_get_configuration {
345 uint64_t query_flags;
349 * Used to return a relay daemon's configuration in reply to the
350 * RELAYD_GET_CONFIGURATION command.
352 struct lttcomm_relayd_get_configuration_reply {
353 struct lttcomm_relayd_generic_reply generic;
354 /* Set of lttcomm_relayd_configuration_flag. */
355 uint64_t relayd_configuration_flags;
356 /* Optional variable-length payload. */
357 char payload[LTTNG_FLEXIBLE_ARRAY_MEMBER_LENGTH];
360 #endif /* _RELAYD_COMM */