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/svm_fifo.h>
23 FIFO_SEGMENT_FTYPE_NONE = -1,
24 FIFO_SEGMENT_RX_FIFO = 0,
27 } fifo_segment_ftype_t;
29 #define FIFO_SEGMENT_MIN_FIFO_SIZE 4096 /* 4kB min fifo size */
30 #define FIFO_SEGMENT_MAX_FIFO_SIZE (2 << 30) /* 2GB max fifo size */
31 #define FIFO_SEGMENT_ALLOC_BATCH_SIZE 32 /* Allocation quantum */
33 typedef enum fifo_segment_flags_
35 FIFO_SEGMENT_F_IS_PREALLOCATED = 1 << 0,
36 FIFO_SEGMENT_F_WILL_DELETE = 1 << 1,
37 } fifo_segment_flags_t;
41 svm_fifo_t *fifos; /**< Linked list of active RX fifos */
42 svm_fifo_t **free_fifos; /**< Freelists, by fifo size */
43 u32 n_active_fifos; /**< Number of active fifos */
44 u8 flags; /**< Segment flags */
45 } fifo_segment_header_t;
49 ssvm_private_t ssvm; /**< ssvm segment data */
50 fifo_segment_header_t *h; /**< fifo segment data */
55 fifo_segment_t *segments; /**< pool of fifo segments */
56 u64 next_baseva; /**< Where to put the next one */
57 u32 timeout_in_seconds; /**< Time to wait during attach */
58 } fifo_segment_main_t;
62 ssvm_segment_type_t segment_type; /**< type of segment requested */
63 u32 segment_size; /**< size of the segment */
64 int memfd_fd; /**< fd for memfd segments */
65 char *segment_name; /**< segment name */
66 u32 *new_segment_indices; /**< return vec of new seg indices */
67 } fifo_segment_create_args_t;
69 #define fifo_segment_flags(_fs) _fs->h->flags
71 int fifo_segment_init (fifo_segment_t * fs);
72 int fifo_segment_create (fifo_segment_main_t * sm,
73 fifo_segment_create_args_t * a);
74 int fifo_segment_attach (fifo_segment_main_t * sm,
75 fifo_segment_create_args_t * a);
76 void fifo_segment_delete (fifo_segment_main_t * sm, fifo_segment_t * fs);
77 fifo_segment_t *fifo_segment_get_segment (fifo_segment_main_t * sm,
79 u32 fifo_segment_index (fifo_segment_main_t * sm, fifo_segment_t * fs);
80 void fifo_segment_info (fifo_segment_t * seg, char **address, size_t * size);
83 * Allocate fifo in fifo segment
85 * @param fs fifo segment
86 * @param data_bytes size of default fifo chunk in bytes
87 * @param ftype fifo type @ref fifo_segment_ftype_t
88 * @return new fifo or 0 if alloc failed
90 svm_fifo_t *fifo_segment_alloc_fifo (fifo_segment_t * fs,
92 fifo_segment_ftype_t ftype);
95 * Free fifo allocated in fifo segment
97 * @param fs fifo segment
98 * @param f fifo to be freed
100 void fifo_segment_free_fifo (fifo_segment_t * fs, svm_fifo_t * f);
103 * Pre-allocates fifo pairs in fifo segment
105 * The number of fifos pre-allocated is the minimum of the requested number
106 * of pairs and the maximum number that fit within the segment. If the maximum
107 * is hit, the number of fifo pairs requested is updated by subtracting the
108 * number of fifos that have been successfully allocated.
110 * @param fs fifo segment
111 * @param rx_fifo_size data size of rx fifos
112 * @param tx_fifo_size data size of tx fifos
113 * @param n_fifo_pairs number of pairs requested. Prior to returning, this
114 * is decremented by the the number of pairs allocated.
116 void fifo_segment_preallocate_fifo_pairs (fifo_segment_t * fs,
120 u8 fifo_segment_has_fifos (fifo_segment_t * fs);
121 svm_fifo_t *fifo_segment_get_fifo_list (fifo_segment_t * fs);
122 u32 fifo_segment_num_fifos (fifo_segment_t * fs);
123 u32 fifo_segment_num_free_fifos (fifo_segment_t * fs, u32 fifo_size_in_bytes);
125 void fifo_segment_main_init (fifo_segment_main_t * sm, u64 baseva,
126 u32 timeout_in_seconds);
128 format_function_t format_fifo_segment;
129 format_function_t format_fifo_segment_type;
131 #endif /* __included_fifo_segment_h__ */
134 * fd.io coding-style-patch-verification: ON
137 * eval: (c-set-style "gnu")