extras/libmemif/src/memif_private.h - fdio/vpp - Gitiles

 /*
  *------------------------------------------------------------------
  * Copyright (c) 2017 Cisco and/or its affiliates.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *------------------------------------------------------------------
  */


 #ifndef _MEMIF_PRIVATE_H_
 #define _MEMIF_PRIVATE_H_

 #define _GNU_SOURCE
 #include <unistd.h>
 #include <sys/syscall.h>
 #include <stdint.h>
 #include <inttypes.h>
 #include <limits.h>
 #include <sys/timerfd.h>
 #include <string.h>

 #include <memif.h>
 #include <libmemif.h>

 #define MEMIF_NAME_LEN 32
 _Static_assert (strlen (MEMIF_DEFAULT_APP_NAME) <= MEMIF_NAME_LEN,
 		"MEMIF_DEFAULT_APP_NAME max length is 32");

 #define MEMIF_DEFAULT_SOCKET_PATH "/run/vpp/memif.sock"
 #define MEMIF_DEFAULT_RING_SIZE 1024
 #define MEMIF_DEFAULT_LOG2_RING_SIZE 10
 #define MEMIF_DEFAULT_RX_QUEUES 1
 #define MEMIF_DEFAULT_TX_QUEUES 1
 #define MEMIF_DEFAULT_BUFFER_SIZE 2048
 #define MEMIF_DEFAULT_RECONNECT_PERIOD_SEC 2
 #define MEMIF_DEFAULT_RECONNECT_PERIOD_NSEC 0

 #define MEMIF_MAX_M2S_RING		255
 #define MEMIF_MAX_S2M_RING		255
 #define MEMIF_MAX_REGION		255
 #define MEMIF_MAX_LOG2_RING_SIZE	14

 #define MEMIF_MAX_FDS 512

 #define memif_min(a,b) (((a) < (b)) ? (a) : (b))

 #define EXPECT_TRUE(x) __builtin_expect((x),1)
 #define EXPECT_FALSE(x) __builtin_expect((x),0)

 #ifdef MEMIF_DBG
 #define DBG(...) do {                                                             \
                         printf("MEMIF_DEBUG:%s:%s:%d: ", __FILE__, __func__, __LINE__);  \
                         printf(__VA_ARGS__);                                            \
                         printf("\n");                                                   \
                         } while (0)
 #else
 #define DBG(...)
 #endif /* MEMIF_DBG */

 typedef enum
 {
   MEMIF_SOCKET_TYPE_NONE = 0,	/* unassigned, not used by any interface */
   MEMIF_SOCKET_TYPE_LISTENER,	/* listener socket, master interface assigned */
   MEMIF_SOCKET_TYPE_CLIENT	/* client socket, slave interface assigned */
 } memif_socket_type_t;

 typedef struct
 {
   void *addr;
   uint32_t region_size;
   uint32_t buffer_offset;
   int fd;
   uint8_t is_external;
 } memif_region_t;

 typedef struct
 {
   memif_ring_t *ring;
   uint8_t log2_ring_size;
   uint8_t region;
   uint32_t offset;

   uint16_t last_head;
   uint16_t last_tail;

   int int_fd;

   uint64_t int_count;
   uint32_t alloc_bufs;
 } memif_queue_t;

 typedef struct memif_msg_queue_elt
 {
   memif_msg_t msg;
   int fd;
   struct memif_msg_queue_elt *next;
 } memif_msg_queue_elt_t;

 struct memif_connection;

 typedef struct memif_connection memif_connection_t;

 /* functions called by memif_control_fd_handler */
 typedef int (memif_fn) (memif_connection_t * conn);

 typedef struct
 {
   uint8_t num_s2m_rings;
   uint8_t num_m2s_rings;
   uint16_t buffer_size;
   memif_log2_ring_size_t log2_ring_size;
 } memif_conn_run_args_t;

 typedef struct memif_connection
 {
   uint16_t index;
   memif_conn_args_t args;
   memif_conn_run_args_t run_args;

   int fd;

   memif_fn *write_fn, *read_fn, *error_fn;

   memif_connection_update_t *on_connect, *on_disconnect;
   memif_interrupt_t *on_interrupt;
   void *private_ctx;

   /* connection message queue */
   memif_msg_queue_elt_t *msg_queue;

   uint8_t remote_if_name[MEMIF_NAME_LEN];
   uint8_t remote_name[MEMIF_NAME_LEN];
   uint8_t remote_disconnect_string[96];

   uint8_t regions_num;
   memif_region_t *regions;

   uint8_t rx_queues_num;
   uint8_t tx_queues_num;
   memif_queue_t *rx_queues;
   memif_queue_t *tx_queues;

   uint16_t flags;
 #define MEMIF_CONNECTION_FLAG_WRITE (1 << 0)
 } memif_connection_t;

 typedef struct
 {
   int key;
   void *data_struct;
 } memif_list_elt_t;

 typedef struct
 {
   int fd;
   uint16_t use_count;
   memif_socket_type_t type;
   uint8_t *filename;
   uint16_t interface_list_len;
   void *private_ctx;
   memif_list_elt_t *interface_list;	/* memif master interfaces listening on this socket */
 } memif_socket_t;

 typedef struct
 {
   memif_control_fd_update_t *control_fd_update;
   int timerfd;
   struct itimerspec arm, disarm;
   uint16_t disconn_slaves;
   uint8_t app_name[MEMIF_NAME_LEN];

   memif_socket_handle_t default_socket;

   memif_add_external_region_t *add_external_region;
   memif_get_external_region_addr_t *get_external_region_addr;
   memif_del_external_region_t *del_external_region;
   memif_get_external_buffer_offset_t *get_external_buffer_offset;

   memif_alloc_t *alloc;
   memif_realloc_t *realloc;
   memif_free_t *free;

   uint16_t control_list_len;
   uint16_t interrupt_list_len;
   uint16_t socket_list_len;
   uint16_t pending_list_len;
   memif_list_elt_t *control_list;
   memif_list_elt_t *interrupt_list;
   memif_list_elt_t *socket_list;
   memif_list_elt_t *pending_list;
 } libmemif_main_t;

 extern libmemif_main_t libmemif_main;
 extern int memif_epfd;

 /* main.c */

 /* if region doesn't contain shared memory, mmap region, check ring cookie */
 int memif_connect1 (memif_connection_t * c);

 /* memory map region, initalize rings and queues */
 int memif_init_regions_and_queues (memif_connection_t * c);

 int memif_disconnect_internal (memif_connection_t * c);

 /* map errno to memif error code */
 int memif_syscall_error_handler (int err_code);

 int add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list,
 		  uint16_t * len);

 int get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list,
 		  uint16_t len, int key);

 int free_list_elt (memif_list_elt_t * list, uint16_t len, int key);

 #ifndef __NR_memfd_create
 #if defined __x86_64__
 #define __NR_memfd_create 319
 #elif defined __arm__
 #define __NR_memfd_create 385
 #elif defined __aarch64__
 #define __NR_memfd_create 279
 #else
 #error "__NR_memfd_create unknown for this architecture"
 #endif
 #endif

 #ifndef HAVE_MEMFD_CREATE
 static inline int
 memfd_create (const char *name, unsigned int flags)
 {
   return syscall (__NR_memfd_create, name, flags);
 }
 #endif

 static inline void *
 memif_get_buffer (memif_connection_t * conn, memif_ring_t * ring,
 		  uint16_t index)
 {
   return (conn->regions[ring->desc[index].region].addr +
 	  ring->desc[index].offset);
 }

 #ifndef F_LINUX_SPECIFIC_BASE
 #define F_LINUX_SPECIFIC_BASE 1024
 #endif

 #ifndef MFD_ALLOW_SEALING
 #define MFD_ALLOW_SEALING       0x0002U
 #endif

 #ifndef F_ADD_SEALS
 #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
 #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)

 #define F_SEAL_SEAL     0x0001	/* prevent further seals from being set */
 #define F_SEAL_SHRINK   0x0002	/* prevent file from shrinking */
 #define F_SEAL_GROW     0x0004	/* prevent file from growing */
 #define F_SEAL_WRITE    0x0008	/* prevent writes */
 #endif

 #endif /* _MEMIF_PRIVATE_H_ */
	/*
	*------------------------------------------------------------------
	* Copyright (c) 2017 Cisco and/or its affiliates.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*------------------------------------------------------------------
	*/


	#ifndef _MEMIF_PRIVATE_H_
	#define _MEMIF_PRIVATE_H_

	#define _GNU_SOURCE
	#include <unistd.h>
	#include <sys/syscall.h>
	#include <stdint.h>
	#include <inttypes.h>
	#include <limits.h>
	#include <sys/timerfd.h>
	#include <string.h>

	#include <memif.h>
	#include <libmemif.h>

	#define MEMIF_NAME_LEN 32
	_Static_assert (strlen (MEMIF_DEFAULT_APP_NAME) <= MEMIF_NAME_LEN,
	"MEMIF_DEFAULT_APP_NAME max length is 32");

	#define MEMIF_DEFAULT_SOCKET_PATH "/run/vpp/memif.sock"
	#define MEMIF_DEFAULT_RING_SIZE 1024
	#define MEMIF_DEFAULT_LOG2_RING_SIZE 10
	#define MEMIF_DEFAULT_RX_QUEUES 1
	#define MEMIF_DEFAULT_TX_QUEUES 1
	#define MEMIF_DEFAULT_BUFFER_SIZE 2048
	#define MEMIF_DEFAULT_RECONNECT_PERIOD_SEC 2
	#define MEMIF_DEFAULT_RECONNECT_PERIOD_NSEC 0

	#define MEMIF_MAX_M2S_RING 255
	#define MEMIF_MAX_S2M_RING 255
	#define MEMIF_MAX_REGION 255
	#define MEMIF_MAX_LOG2_RING_SIZE 14

	#define MEMIF_MAX_FDS 512

	#define memif_min(a,b) (((a) < (b)) ? (a) : (b))

	#define EXPECT_TRUE(x) __builtin_expect((x),1)
	#define EXPECT_FALSE(x) __builtin_expect((x),0)

	#ifdef MEMIF_DBG
	#define DBG(...) do { \
	printf("MEMIF_DEBUG:%s:%s:%d: ", __FILE__, __func__, __LINE__); \
	printf(__VA_ARGS__); \
	printf("\n"); \
	} while (0)
	#else
	#define DBG(...)
	#endif /* MEMIF_DBG */

	typedef enum
	{
	MEMIF_SOCKET_TYPE_NONE = 0, /* unassigned, not used by any interface */
	MEMIF_SOCKET_TYPE_LISTENER, /* listener socket, master interface assigned */
	MEMIF_SOCKET_TYPE_CLIENT /* client socket, slave interface assigned */
	} memif_socket_type_t;

	typedef struct
	{
	void *addr;
	uint32_t region_size;
	uint32_t buffer_offset;
	int fd;
	uint8_t is_external;
	} memif_region_t;

	typedef struct
	{
	memif_ring_t *ring;
	uint8_t log2_ring_size;
	uint8_t region;
	uint32_t offset;

	uint16_t last_head;
	uint16_t last_tail;

	int int_fd;

	uint64_t int_count;
	uint32_t alloc_bufs;
	} memif_queue_t;

	typedef struct memif_msg_queue_elt
	{
	memif_msg_t msg;
	int fd;
	struct memif_msg_queue_elt *next;
	} memif_msg_queue_elt_t;

	struct memif_connection;

	typedef struct memif_connection memif_connection_t;

	/* functions called by memif_control_fd_handler */
	typedef int (memif_fn) (memif_connection_t * conn);

	typedef struct
	{
	uint8_t num_s2m_rings;
	uint8_t num_m2s_rings;
	uint16_t buffer_size;
	memif_log2_ring_size_t log2_ring_size;
	} memif_conn_run_args_t;

	typedef struct memif_connection
	{
	uint16_t index;
	memif_conn_args_t args;
	memif_conn_run_args_t run_args;

	int fd;

	memif_fn write_fn, read_fn, *error_fn;

	memif_connection_update_t on_connect, on_disconnect;
	memif_interrupt_t *on_interrupt;
	void *private_ctx;

	/* connection message queue */
	memif_msg_queue_elt_t *msg_queue;

	uint8_t remote_if_name[MEMIF_NAME_LEN];
	uint8_t remote_name[MEMIF_NAME_LEN];
	uint8_t remote_disconnect_string[96];

	uint8_t regions_num;
	memif_region_t *regions;

	uint8_t rx_queues_num;
	uint8_t tx_queues_num;
	memif_queue_t *rx_queues;
	memif_queue_t *tx_queues;

	uint16_t flags;
	#define MEMIF_CONNECTION_FLAG_WRITE (1 << 0)
	} memif_connection_t;

	typedef struct
	{
	int key;
	void *data_struct;
	} memif_list_elt_t;

	typedef struct
	{
	int fd;
	uint16_t use_count;
	memif_socket_type_t type;
	uint8_t *filename;
	uint16_t interface_list_len;
	void *private_ctx;
	memif_list_elt_t interface_list; / memif master interfaces listening on this socket */
	} memif_socket_t;

	typedef struct
	{
	memif_control_fd_update_t *control_fd_update;
	int timerfd;
	struct itimerspec arm, disarm;
	uint16_t disconn_slaves;
	uint8_t app_name[MEMIF_NAME_LEN];

	memif_socket_handle_t default_socket;

	memif_add_external_region_t *add_external_region;
	memif_get_external_region_addr_t *get_external_region_addr;
	memif_del_external_region_t *del_external_region;
	memif_get_external_buffer_offset_t *get_external_buffer_offset;

	memif_alloc_t *alloc;
	memif_realloc_t *realloc;
	memif_free_t *free;

	uint16_t control_list_len;
	uint16_t interrupt_list_len;
	uint16_t socket_list_len;
	uint16_t pending_list_len;
	memif_list_elt_t *control_list;
	memif_list_elt_t *interrupt_list;
	memif_list_elt_t *socket_list;
	memif_list_elt_t *pending_list;
	} libmemif_main_t;

	extern libmemif_main_t libmemif_main;
	extern int memif_epfd;

	/* main.c */

	/* if region doesn't contain shared memory, mmap region, check ring cookie */
	int memif_connect1 (memif_connection_t * c);

	/* memory map region, initalize rings and queues */
	int memif_init_regions_and_queues (memif_connection_t * c);

	int memif_disconnect_internal (memif_connection_t * c);

	/* map errno to memif error code */
	int memif_syscall_error_handler (int err_code);

	int add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list,
	uint16_t * len);

	int get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list,
	uint16_t len, int key);

	int free_list_elt (memif_list_elt_t * list, uint16_t len, int key);

	#ifndef __NR_memfd_create
	#if defined __x86_64__
	#define __NR_memfd_create 319
	#elif defined __arm__
	#define __NR_memfd_create 385
	#elif defined __aarch64__
	#define __NR_memfd_create 279
	#else
	#error "__NR_memfd_create unknown for this architecture"
	#endif
	#endif

	#ifndef HAVE_MEMFD_CREATE
	static inline int
	memfd_create (const char *name, unsigned int flags)
	{
	return syscall (__NR_memfd_create, name, flags);
	}
	#endif

	static inline void *
	memif_get_buffer (memif_connection_t * conn, memif_ring_t * ring,
	uint16_t index)
	{
	return (conn->regions[ring->desc[index].region].addr +
	ring->desc[index].offset);
	}

	#ifndef F_LINUX_SPECIFIC_BASE
	#define F_LINUX_SPECIFIC_BASE 1024
	#endif

	#ifndef MFD_ALLOW_SEALING
	#define MFD_ALLOW_SEALING 0x0002U
	#endif

	#ifndef F_ADD_SEALS
	#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
	#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)

	#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
	#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
	#define F_SEAL_GROW 0x0004 /* prevent file from growing */
	#define F_SEAL_WRITE 0x0008 /* prevent writes */
	#endif

	#endif /* _MEMIF_PRIVATE_H_ */