2 * Copyright (c) 2016-2019 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.
15 #ifndef __included_fifo_segment_h__
16 #define __included_fifo_segment_h__
19 #include <svm/fifo_types.h>
20 #include <svm/svm_fifo.h>
24 FIFO_SEGMENT_FTYPE_NONE = -1,
25 FIFO_SEGMENT_RX_FIFO = 0,
28 } fifo_segment_ftype_t;
30 #define FIFO_SEGMENT_MIN_LOG2_FIFO_SIZE 12 /**< 4kB min fifo size */
31 #define FIFO_SEGMENT_MIN_FIFO_SIZE 4096 /**< 4kB min fifo size */
32 #define FIFO_SEGMENT_MAX_FIFO_SIZE (2ULL << 30) /**< 2GB max fifo size */
33 #define FIFO_SEGMENT_ALLOC_BATCH_SIZE 32 /* Allocation quantum */
35 typedef enum fifo_segment_flags_
37 FIFO_SEGMENT_F_IS_PREALLOCATED = 1 << 0,
38 FIFO_SEGMENT_F_WILL_DELETE = 1 << 1,
39 FIFO_SEGMENT_F_MEM_LIMIT = 1 << 2,
40 } fifo_segment_flags_t;
42 #define foreach_segment_mem_status \
43 _(NO_PRESSURE, "No pressure") \
44 _(LOW_PRESSURE, "Low pressure") \
45 _(HIGH_PRESSURE, "High pressure") \
46 _(NO_MEMORY, "No memory")
50 #define _(sym,str) MEMORY_PRESSURE_##sym,
51 foreach_segment_mem_status
54 } fifo_segment_mem_status_t;
57 typedef enum fifo_segment_mem_status_
59 MEMORY_PRESSURE_NO_PRESSURE,
60 MEMORY_PRESSURE_LOW_PRESSURE,
61 MEMORY_PRESSURE_HIGH_PRESSURE,
62 MEMORY_PRESSURE_NO_MEMORY,
63 } fifo_segment_mem_status_t;
68 ssvm_private_t ssvm; /**< ssvm segment data */
69 fifo_segment_header_t *h; /**< fifo segment data */
71 u8 n_slices; /**< number of fifo segment slices */
76 fifo_segment_t *segments; /**< pool of fifo segments */
77 uword next_baseva; /**< Where to put the next one */
78 u32 timeout_in_seconds; /**< Time to wait during attach */
79 } fifo_segment_main_t;
83 ssvm_segment_type_t segment_type; /**< type of segment requested */
84 u32 segment_size; /**< size of the segment */
85 int memfd_fd; /**< fd for memfd segments */
86 char *segment_name; /**< segment name */
87 u32 *new_segment_indices; /**< return vec of new seg indices */
88 } fifo_segment_create_args_t;
90 #define fifo_segment_flags(_fs) _fs->h->flags
92 int fifo_segment_init (fifo_segment_t * fs);
93 int fifo_segment_create (fifo_segment_main_t * sm,
94 fifo_segment_create_args_t * a);
95 int fifo_segment_attach (fifo_segment_main_t * sm,
96 fifo_segment_create_args_t * a);
97 void fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * fs);
98 fifo_segment_t *fifo_segment_get_segment (fifo_segment_main_t * sm,
100 u32 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * fs);
101 void fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size);
104 * Allocate fifo in fifo segment
106 * @param fs fifo segment for fifo
107 * @param data_bytes size of default fifo chunk in bytes
108 * @param ftype fifo type @ref fifo_segment_ftype_t
109 * @return new fifo or 0 if alloc failed
111 svm_fifo_t *fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs,
114 fifo_segment_ftype_t ftype);
117 * Free fifo allocated in fifo segment
119 * @param fs fifo segment for fifo
120 * @param f fifo to be freed
122 void fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f);
124 void fifo_segment_detach_fifo (fifo_segment_t * fs, svm_fifo_t * f);
125 void fifo_segment_attach_fifo (fifo_segment_t * fs, svm_fifo_t * f,
129 * Try to preallocate fifo headers
131 * Tries to preallocate fifo headers and adds them to freelist.
133 * @param fs fifo segment
134 * @param batch_size number of chunks to be allocated
135 * @return 0 on success, negative number otherwise
137 int fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
141 * Try to preallocate fifo chunks on segment
143 * Tries to preallocate chunks of requested size on segment and adds them
146 * @param fs fifo segment
147 * @param chunk_size size of chunks to be allocated in bytes
148 * @param batch_size number of chunks to be allocated
149 * @return 0 on success, negative number otherwise
151 int fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
152 u32 chunk_size, u32 batch_size);
154 * Pre-allocates fifo pairs in fifo segment
156 * The number of fifos pre-allocated is the minimum of the requested number
157 * of pairs and the maximum number that fit within the segment. If the maximum
158 * is hit, the number of fifo pairs requested is updated by subtracting the
159 * number of fifos that have been successfully allocated.
161 * @param fs fifo segment for fifo
162 * @param rx_fifo_size data size of rx fifos
163 * @param tx_fifo_size data size of tx fifos
164 * @param n_fifo_pairs number of pairs requested. Prior to returning, this
165 * is decremented by the the number of pairs allocated.
167 void fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
173 * Allocate chunks in fifo segment
175 * @param fsh fifo segment header
176 * @param slice_index slice where chunks should be alocated
177 * @param chunk_size chunk size needed
178 * @return chunk (or chunks) that cover at least chunk_size bytes
179 * on success, 0 on failure.
181 svm_fifo_chunk_t *fsh_alloc_chunk (fifo_segment_header_t * fsh,
182 u32 slice_index, u32 chunk_size);
185 * Return chunks to fifo segment
187 * @param fsh fifo segment header
188 * @param slice_index slice where chunks should be returned
189 * @param c pointer to first chunk in 0 terminated linked list
191 void fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
192 svm_fifo_chunk_t * c);
195 * Fifo segment has reached mem limit
197 * @param fsh fifo segment header
198 * @return 1 (if reached) or 0 (otherwise)
200 u8 fsh_has_reached_mem_limit (fifo_segment_header_t * fsh);
203 * Fifo segment reset mem limit flag
205 * @param fs fifo segment
207 void fsh_reset_mem_limit (fifo_segment_header_t * fsh);
210 * Fifo segment reset mem limit flag
212 * @param fs fifo segment
213 * @param size size requested
214 * @return pointer to memory allocated or 0
216 void *fifo_segment_alloc (fifo_segment_t *fs, uword size);
218 * Fifo segment allocated size
220 * Returns fifo segment's allocated size
222 * @param fs fifo segment
223 * @return allocated size in bytes
225 uword fifo_segment_size (fifo_segment_t * fs);
228 * Fifo segment estimate of number of free bytes
230 * Returns fifo segment's internal estimate of the number of free bytes.
231 * To force a synchronization between the segment and the underlying
232 * memory allocator, call @ref fifo_segment_update_free_bytes
234 * @param fs fifo segment
235 * @return free bytes estimate
237 uword fifo_segment_free_bytes (fifo_segment_t * fs);
240 * Fifo segment number of cached bytes
242 * Returns fifo segment's number of cached bytes.
244 * @param fs fifo segment
245 * @return cached bytes
247 uword fifo_segment_cached_bytes (fifo_segment_t * fs);
249 uword fifo_segment_available_bytes (fifo_segment_t * fs);
252 * Number of bytes on chunk free lists
254 * @param fs fifo segment
255 * @return free bytes on chunk free lists
257 uword fifo_segment_fl_chunk_bytes (fifo_segment_t * fs);
258 u8 fifo_segment_has_fifos (fifo_segment_t * fs);
259 svm_fifo_t *fifo_segment_get_slice_fifo_list (fifo_segment_t * fs,
261 u32 fifo_segment_num_fifos (fifo_segment_t * fs);
262 u32 fifo_segment_num_free_fifos (fifo_segment_t * fs);
264 * Find number of free chunks of given size
266 * @param fs fifo segment
267 * @param size chunk size of interest or ~0 if all should be counted
268 * @return number of chunks of given size
270 u32 fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size);
272 u8 fifo_segment_get_mem_usage (fifo_segment_t * fs);
273 fifo_segment_mem_status_t fifo_segment_determine_status
274 (fifo_segment_header_t * fsh, u8 usage);
275 fifo_segment_mem_status_t fifo_segment_get_mem_status (fifo_segment_t * fs);
277 void fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
278 u32 timeout_in_seconds);
280 format_function_t format_fifo_segment;
281 format_function_t format_fifo_segment_type;
283 #endif /* __included_fifo_segment_h__ */
286 * fd.io coding-style-patch-verification: ON
289 * eval: (c-set-style "gnu")