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 (2 << 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;
44 ssvm_private_t ssvm; /**< ssvm segment data */
45 fifo_segment_header_t *h; /**< fifo segment data */
46 u8 n_slices; /**< number of fifo segment slices */
51 fifo_segment_t *segments; /**< pool of fifo segments */
52 uword next_baseva; /**< Where to put the next one */
53 u32 timeout_in_seconds; /**< Time to wait during attach */
54 } fifo_segment_main_t;
58 ssvm_segment_type_t segment_type; /**< type of segment requested */
59 u32 segment_size; /**< size of the segment */
60 int memfd_fd; /**< fd for memfd segments */
61 char *segment_name; /**< segment name */
62 u32 *new_segment_indices; /**< return vec of new seg indices */
63 } fifo_segment_create_args_t;
65 #define fifo_segment_flags(_fs) _fs->h->flags
67 int fifo_segment_init (fifo_segment_t * fs);
68 int fifo_segment_create (fifo_segment_main_t * sm,
69 fifo_segment_create_args_t * a);
70 int fifo_segment_attach (fifo_segment_main_t * sm,
71 fifo_segment_create_args_t * a);
72 void fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * fs);
73 fifo_segment_t *fifo_segment_get_segment (fifo_segment_main_t * sm,
75 u32 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * fs);
76 void fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size);
79 * Allocate fifo in fifo segment
81 * @param fs fifo segment for fifo
82 * @param data_bytes size of default fifo chunk in bytes
83 * @param ftype fifo type @ref fifo_segment_ftype_t
84 * @return new fifo or 0 if alloc failed
86 svm_fifo_t *fifo_segment_alloc_fifo_w_slice (fifo_segment_t * fs,
89 fifo_segment_ftype_t ftype);
92 * Free fifo allocated in fifo segment
94 * @param fs fifo segment for fifo
95 * @param f fifo to be freed
97 void fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f);
100 * Try to preallocate fifo headers
102 * Tries to preallocate fifo headers and adds them to freelist.
104 * @param fs fifo segment
105 * @param batch_size number of chunks to be allocated
106 * @return 0 on success, negative number otherwise
108 int fifo_segment_prealloc_fifo_hdrs (fifo_segment_t * fs, u32 slice_index,
112 * Try to preallocate fifo chunks on segment
114 * Tries to preallocate chunks of requested size on segment and adds them
117 * @param fs fifo segment
118 * @param chunk_size size of chunks to be allocated in bytes
119 * @param batch_size number of chunks to be allocated
120 * @return 0 on success, negative number otherwise
122 int fifo_segment_prealloc_fifo_chunks (fifo_segment_t * fs, u32 slice_index,
123 u32 chunk_size, u32 batch_size);
125 * Pre-allocates fifo pairs in fifo segment
127 * The number of fifos pre-allocated is the minimum of the requested number
128 * of pairs and the maximum number that fit within the segment. If the maximum
129 * is hit, the number of fifo pairs requested is updated by subtracting the
130 * number of fifos that have been successfully allocated.
132 * @param fs fifo segment for fifo
133 * @param rx_fifo_size data size of rx fifos
134 * @param tx_fifo_size data size of tx fifos
135 * @param n_fifo_pairs number of pairs requested. Prior to returning, this
136 * is decremented by the the number of pairs allocated.
138 void fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
143 svm_fifo_chunk_t *fsh_alloc_chunk (fifo_segment_header_t * fsh,
144 u32 slice_index, u32 chunk_size);
146 void fsh_collect_chunks (fifo_segment_header_t * fsh, u32 slice_index,
147 svm_fifo_chunk_t * cur);
150 * Fifo segment estimate of number of free bytes
152 * Returns fifo segment's internal estimate of the number of free bytes.
153 * To force a synchronization between the segment and the underlying
154 * memory allocator, call @ref fifo_segment_update_free_bytes
156 * @param fs fifo segment
157 * @return free bytes estimate
159 uword fifo_segment_free_bytes (fifo_segment_t * fs);
162 * Update fifo segment free bytes estimate
164 * Forces fifo segment free bytes estimate synchronization with underlying
167 * @param fs fifo segment
169 void fifo_segment_update_free_bytes (fifo_segment_t * fs);
172 * Number of bytes on chunk free lists
174 * @param fs fifo segment
175 * @return free bytes on chunk free lists
177 uword fifo_segment_fl_chunk_bytes (fifo_segment_t * fs);
178 u8 fifo_segment_has_fifos (fifo_segment_t * fs);
179 svm_fifo_t *fifo_segment_get_slice_fifo_list (fifo_segment_t * fs,
181 u32 fifo_segment_num_fifos (fifo_segment_t * fs);
182 u32 fifo_segment_num_free_fifos (fifo_segment_t * fs);
184 * Find number of free chunks of given size
186 * @param fs fifo segment
187 * @param size chunk size of interest or ~0 if all should be counted
188 * @return number of chunks of given size
190 u32 fifo_segment_num_free_chunks (fifo_segment_t * fs, u32 size);
192 void fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
193 u32 timeout_in_seconds);
195 format_function_t format_fifo_segment;
196 format_function_t format_fifo_segment_type;
198 #endif /* __included_fifo_segment_h__ */
201 * fd.io coding-style-patch-verification: ON
204 * eval: (c-set-style "gnu")