FD.io VPP  v18.04-17-g3a0d853
Vector Packet Processing
memif.h
Go to the documentation of this file.
1 /*
2  *------------------------------------------------------------------
3  * Copyright (c) 2017 Cisco and/or its affiliates.
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at:
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *------------------------------------------------------------------
16  */
17 
18 #ifndef _MEMIF_H_
19 #define _MEMIF_H_
20 
21 #ifndef MEMIF_CACHELINE_SIZE
22 #define MEMIF_CACHELINE_SIZE 64
23 #endif
24 
25 #define MEMIF_COOKIE 0x3E31F20
26 #define MEMIF_VERSION_MAJOR 2
27 #define MEMIF_VERSION_MINOR 0
28 #define MEMIF_VERSION ((MEMIF_VERSION_MAJOR << 8) | MEMIF_VERSION_MINOR)
29 
30 /*
31  * Type definitions
32  */
33 
34 typedef enum memif_msg_type
35 {
46 
47 typedef enum
48 {
52 
53 typedef enum
54 {
59 
60 typedef uint16_t memif_region_index_t;
61 typedef uint32_t memif_region_offset_t;
62 typedef uint64_t memif_region_size_t;
63 typedef uint16_t memif_ring_index_t;
64 typedef uint32_t memif_interface_id_t;
65 typedef uint16_t memif_version_t;
66 typedef uint8_t memif_log2_ring_size_t;
67 
68 /*
69  * Socket messages
70  */
71 
72 typedef struct __attribute__ ((packed))
73 {
74  uint8_t name[32];
75  memif_version_t min_version;
76  memif_version_t max_version;
77  memif_region_index_t max_region;
78  memif_ring_index_t max_m2s_ring;
79  memif_ring_index_t max_s2m_ring;
80  memif_log2_ring_size_t max_log2_ring_size;
82 
83 typedef struct __attribute__ ((packed))
84 {
85  memif_version_t version;
86  memif_interface_id_t id;
88  uint8_t secret[24];
89  uint8_t name[32];
91 
92 typedef struct __attribute__ ((packed))
93 {
94  memif_region_index_t index;
95  memif_region_size_t size;
97 
98 typedef struct __attribute__ ((packed))
99 {
100  uint16_t flags;
101 #define MEMIF_MSG_ADD_RING_FLAG_S2M (1 << 0)
102  memif_ring_index_t index;
103  memif_region_index_t region;
104  memif_region_offset_t offset;
105  memif_log2_ring_size_t log2_ring_size;
106  uint16_t private_hdr_size; /* used for private metadata */
108 
109 typedef struct __attribute__ ((packed))
110 {
111  uint8_t if_name[32];
113 
114 typedef struct __attribute__ ((packed))
115 {
116  uint8_t if_name[32];
118 
119 typedef struct __attribute__ ((packed))
120 {
121  uint32_t code;
122  uint8_t string[96];
124 
125 typedef struct __attribute__ ((packed, aligned (128)))
126 {
127  memif_msg_type_t type:16;
128  union
129  {
130  memif_msg_hello_t hello;
132  memif_msg_add_region_t add_region;
133  memif_msg_add_ring_t add_ring;
134  memif_msg_connect_t connect;
135  memif_msg_connected_t connected;
136  memif_msg_disconnect_t disconnect;
137  };
138 } memif_msg_t;
139 
140 _Static_assert (sizeof (memif_msg_t) == 128,
141  "Size of memif_msg_t must be 128");
142 
143 /*
144  * Ring and Descriptor Layout
145  */
146 
147 typedef struct __attribute__ ((packed))
148 {
149  uint16_t flags;
150 #define MEMIF_DESC_FLAG_NEXT (1 << 0)
151  memif_region_index_t region;
152  uint32_t length;
153  memif_region_offset_t offset;
154  uint32_t metadata;
155 } memif_desc_t;
156 
157 _Static_assert (sizeof (memif_desc_t) == 16,
158  "Size of memif_dsct_t must be 16 bytes");
159 
160 #define MEMIF_CACHELINE_ALIGN_MARK(mark) \
161  uint8_t mark[0] __attribute__((aligned(MEMIF_CACHELINE_SIZE)))
162 
163 typedef struct
164 {
165  MEMIF_CACHELINE_ALIGN_MARK (cacheline0);
166  uint32_t cookie;
167  uint16_t flags;
168 #define MEMIF_RING_FLAG_MASK_INT 1
169  volatile uint16_t head;
170  MEMIF_CACHELINE_ALIGN_MARK (cacheline1);
171  volatile uint16_t tail;
172  MEMIF_CACHELINE_ALIGN_MARK (cacheline2);
173  memif_desc_t desc[0];
174 } memif_ring_t;
175 
176 #endif /* _MEMIF_H_ */
177 
178 /*
179  * fd.io coding-style-patch-verification: ON
180  *
181  * Local Variables:
182  * eval: (c-set-style "gnu")
183  * End:
184  */
memif_msg_type
Definition: memif.h:34
#define MEMIF_CACHELINE_ALIGN_MARK(mark)
Definition: memif.h:160
uint16_t memif_ring_index_t
Definition: memif.h:63
memif_interface_mode_t
Definition: memif.h:53
uint16_t memif_region_index_t
Definition: memif.h:60
enum memif_msg_type memif_msg_type_t
uint16_t memif_version_t
Definition: memif.h:65
u32 size
uint32_t memif_region_offset_t
Definition: memif.h:61
uint8_t memif_log2_ring_size_t
Definition: memif.h:66
uint32_t memif_interface_id_t
Definition: memif.h:64
option version
Definition: memclnt.api:17
static void init(void)
Definition: client.c:76
uint64_t memif_region_size_t
Definition: memif.h:62
struct clib_bihash_value offset
template key/value backing page structure
memif_ring_type_t
Definition: memif.h:47
u32 flags
Definition: vhost-user.h:77