2 * Copyright (c) 2017 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/session/segment_manager.h>
17 #include <vnet/session/session.h>
18 #include <vnet/session/application.h>
21 * Counter used to build segment names
23 u32 segment_name_counter = 0;
26 * Pool of segment managers
28 segment_manager_t *segment_managers = 0;
31 * Default fifo and segment size. TODO config.
33 u32 default_fifo_size = 1 << 16;
34 u32 default_segment_size = 1 << 20;
37 segment_manager_get_segment_info (u32 index, u8 ** name, u32 * size)
39 svm_fifo_segment_private_t *s;
40 s = svm_fifo_get_segment (index);
41 *name = s->h->segment_name;
42 *size = s->ssvm.ssvm_size;
46 session_manager_add_segment_i (segment_manager_t * sm, u32 segment_size,
49 svm_fifo_segment_create_args_t _ca, *ca = &_ca;
52 memset (ca, 0, sizeof (*ca));
54 ca->segment_name = (char *) segment_name;
55 ca->segment_size = segment_size;
57 rv = svm_fifo_segment_create (ca);
60 clib_warning ("svm_fifo_segment_create ('%s', %d) failed",
61 ca->segment_name, ca->segment_size);
62 vec_free (segment_name);
63 return VNET_API_ERROR_SVM_SEGMENT_CREATE_FAIL;
66 vec_add1 (sm->segment_indices, ca->new_segment_index);
72 session_manager_add_segment (segment_manager_t * sm)
75 svm_fifo_segment_create_args_t _ca, *ca = &_ca;
79 memset (ca, 0, sizeof (*ca));
80 segment_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
81 add_segment_size = sm->properties->add_segment_size ?
82 sm->properties->add_segment_size : default_segment_size;
84 rv = session_manager_add_segment_i (sm, add_segment_size, segment_name);
85 vec_free (segment_name);
90 session_manager_add_first_segment (segment_manager_t * sm, u32 segment_size)
92 svm_fifo_segment_create_args_t _ca, *ca = &_ca;
96 memset (ca, 0, sizeof (*ca));
97 segment_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
98 rv = session_manager_add_segment_i (sm, segment_size, segment_name);
99 vec_free (segment_name);
104 * Initializes segment manager based on options provided.
105 * Returns error if svm segment allocation fails.
108 segment_manager_init (segment_manager_t * sm,
109 segment_manager_properties_t * properties,
114 /* app allocates these */
115 sm->properties = properties;
117 if (first_seg_size > 0)
119 rv = session_manager_add_first_segment (sm, first_seg_size);
122 clib_warning ("Failed to allocate segment");
131 * Removes segment manager.
133 * Since the fifos allocated in the segment keep backpointers to the sessions
134 * prior to removing the segment, we call session disconnect. This
135 * subsequently propages into transport.
138 segment_manager_del (segment_manager_t * sm)
140 u32 *deleted_sessions = 0;
141 u32 *deleted_thread_indices = 0;
144 /* Across all fifo segments used by the server */
145 for (j = 0; j < vec_len (sm->segment_indices); j++)
147 svm_fifo_segment_private_t *fifo_segment;
149 /* Vector of fifos allocated in the segment */
150 fifo_segment = svm_fifo_get_segment (sm->segment_indices[j]);
151 fifos = svm_fifo_segment_get_fifos (fifo_segment);
154 * Remove any residual sessions from the session lookup table
155 * Don't bother deleting the individual fifos, we're going to
156 * throw away the fifo segment in a minute.
158 for (i = 0; i < vec_len (fifos); i++)
161 u32 session_index, thread_index;
162 stream_session_t *session;
165 session_index = fifo->server_session_index;
166 thread_index = fifo->server_thread_index;
168 session = stream_session_get (session_index, thread_index);
170 /* Add to the deleted_sessions vector (once!) */
171 if (!session->is_deleted)
173 session->is_deleted = 1;
174 vec_add1 (deleted_sessions, session_index);
175 vec_add1 (deleted_thread_indices, thread_index);
179 for (i = 0; i < vec_len (deleted_sessions); i++)
181 stream_session_t *session;
182 session = stream_session_get (deleted_sessions[i],
183 deleted_thread_indices[i]);
185 /* Instead of directly removing the session call disconnect */
186 stream_session_disconnect (session);
189 stream_session_table_del (smm, session);
190 pool_put(smm->sessions[deleted_thread_indices[i]], session);
194 vec_reset_length (deleted_sessions);
195 vec_reset_length (deleted_thread_indices);
197 /* Instead of removing the segment, test when removing the session if
198 * the segment can be removed
200 /* svm_fifo_segment_delete (fifo_segment); */
203 vec_free (deleted_sessions);
204 vec_free (deleted_thread_indices);
205 pool_put (segment_managers, sm);
209 segment_manager_notify_app_seg_add (segment_manager_t * sm,
210 u32 fifo_segment_index)
212 application_t *app = application_get (sm->app_index);
216 /* Send an API message to the external app, to map new segment */
217 ASSERT (app->cb_fns.add_segment_callback);
219 segment_manager_get_segment_info (fifo_segment_index, &seg_name, &seg_size);
220 return app->cb_fns.add_segment_callback (app->api_client_index, seg_name,
225 segment_manager_alloc_session_fifos (segment_manager_t * sm,
226 svm_fifo_t ** server_rx_fifo,
227 svm_fifo_t ** server_tx_fifo,
228 u32 * fifo_segment_index)
230 svm_fifo_segment_private_t *fifo_segment;
231 u32 fifo_size, sm_index;
232 u8 added_a_segment = 0;
235 /* Allocate svm fifos */
236 ASSERT (vec_len (sm->segment_indices));
239 for (i = 0; i < vec_len (sm->segment_indices); i++)
241 *fifo_segment_index = sm->segment_indices[i];
242 fifo_segment = svm_fifo_get_segment (*fifo_segment_index);
244 fifo_size = sm->properties->rx_fifo_size;
245 fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size;
246 *server_rx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size);
248 fifo_size = sm->properties->tx_fifo_size;
249 fifo_size = (fifo_size == 0) ? default_fifo_size : fifo_size;
250 *server_tx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, fifo_size);
252 if (*server_rx_fifo == 0)
254 /* This would be very odd, but handle it... */
255 if (*server_tx_fifo != 0)
257 svm_fifo_segment_free_fifo (fifo_segment, *server_tx_fifo);
262 if (*server_tx_fifo == 0)
264 if (*server_rx_fifo != 0)
266 svm_fifo_segment_free_fifo (fifo_segment, *server_rx_fifo);
274 /* See if we're supposed to create another segment */
275 if (*server_rx_fifo == 0)
277 if (sm->properties->add_segment)
281 clib_warning ("added a segment, still cant allocate a fifo");
282 return SESSION_ERROR_NEW_SEG_NO_SPACE;
285 if (session_manager_add_segment (sm))
286 return VNET_API_ERROR_URI_FIFO_CREATE_FAILED;
293 clib_warning ("No space to allocate fifos!");
294 return SESSION_ERROR_NO_SPACE;
299 return segment_manager_notify_app_seg_add (sm, *fifo_segment_index);
301 /* Backpointers to segment manager */
302 sm_index = segment_manager_index (sm);
303 (*server_tx_fifo)->segment_manager = sm_index;
304 (*server_rx_fifo)->segment_manager = sm_index;
310 segment_manager_dealloc_fifos (u32 svm_segment_index, svm_fifo_t * rx_fifo,
311 svm_fifo_t * tx_fifo)
313 segment_manager_t *sm;
314 svm_fifo_segment_private_t *fifo_segment;
316 fifo_segment = svm_fifo_get_segment (svm_segment_index);
317 svm_fifo_segment_free_fifo (fifo_segment, rx_fifo);
318 svm_fifo_segment_free_fifo (fifo_segment, tx_fifo);
320 /* If we have segment manager, try doing some cleanup.
321 * It's possible to have no segment manager if the session was removed
322 * as result of a detach */
323 sm = segment_manager_get_if_valid (rx_fifo->segment_manager);
326 /* Remove segment only if it holds no fifos and not the first */
327 if (sm->segment_indices[0] != svm_segment_index
328 && !svm_fifo_segment_has_fifos (fifo_segment))
330 svm_fifo_segment_delete (fifo_segment);
331 vec_del1 (sm->segment_indices, svm_segment_index);
337 * fd.io coding-style-patch-verification: ON
340 * eval: (c-set-style "gnu")