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Diffstat (limited to 'extras/libmemif/src/libmemif.h')
| -rw-r--r-- | extras/libmemif/src/libmemif.h | 443 |
1 files changed, 443 insertions, 0 deletions
diff --git a/extras/libmemif/src/libmemif.h b/extras/libmemif/src/libmemif.h new file mode 100644 index 00000000..a2d1a5e2 --- /dev/null +++ b/extras/libmemif/src/libmemif.h @@ -0,0 +1,443 @@ +/* + *------------------------------------------------------------------ + * 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. + *------------------------------------------------------------------ + */ + +/** @file */ + +#ifndef _LIBMEMIF_H_ +#define _LIBMEMIF_H_ + +/** Libmemif version. */ +#define LIBMEMIF_VERSION "1.0" +/** Default name of application using libmemif. */ +#define MEMIF_DEFAULT_APP_NAME "libmemif-app" + +#include <inttypes.h> + +#include <memif.h> + +/*! Error codes */ +typedef enum +{ + MEMIF_ERR_SUCCESS = 0, /*!< success */ +/* SYSCALL ERRORS */ + MEMIF_ERR_SYSCALL, /*!< other syscall error */ + MEMIF_ERR_ACCES, /*!< permission denied */ + MEMIF_ERR_NO_FILE, /*!< file does not exist */ + MEMIF_ERR_FILE_LIMIT, /*!< system open file limit */ + MEMIF_ERR_PROC_FILE_LIMIT, /*!< process open file limit */ + MEMIF_ERR_ALREADY, /*!< connection already requested */ + MEMIF_ERR_AGAIN, /*!< fd is not socket, or operation would block */ + MEMIF_ERR_BAD_FD, /*!< invalid fd */ + MEMIF_ERR_NOMEM, /*!< out of memory */ +/* LIBMEMIF ERRORS */ + MEMIF_ERR_INVAL_ARG, /*!< invalid argument */ + MEMIF_ERR_NOCONN, /*!< handle points to no connection */ + MEMIF_ERR_CONN, /*!< handle points to existing connection */ + MEMIF_ERR_CB_FDUPDATE, /*!< user defined callback memif_control_fd_update_t error */ + MEMIF_ERR_FILE_NOT_SOCK, /*!< file specified by socket filename + exists, but it's not socket */ + MEMIF_ERR_NO_SHMFD, /*!< missing shm fd */ + MEMIF_ERR_COOKIE, /*!< wrong cookie on ring */ + MEMIF_ERR_NOBUF_RING, /*!< ring buffer full */ + MEMIF_ERR_NOBUF, /*!< not enough memif buffers */ + MEMIF_ERR_NOBUF_DET, /*!< memif details needs larger buffer */ + MEMIF_ERR_INT_WRITE, /*!< send interrupt error */ + MEMIF_ERR_MFMSG, /*!< malformed msg received */ + MEMIF_ERR_QID, /*!< invalid queue id */ +/* MEMIF PROTO ERRORS */ + MEMIF_ERR_PROTO, /*!< incompatible protocol version */ + MEMIF_ERR_ID, /*!< unmatched interface id */ + MEMIF_ERR_ACCSLAVE, /*!< slave cannot accept connection requests */ + MEMIF_ERR_ALRCONN, /*!< memif is already connected */ + MEMIF_ERR_MODE, /*!< mode mismatch */ + MEMIF_ERR_SECRET, /*!< secret mismatch */ + MEMIF_ERR_NOSECRET, /*!< secret required */ + MEMIF_ERR_MAXREG, /*!< max region limit reached */ + MEMIF_ERR_MAXRING, /*!< max ring limit reached */ + MEMIF_ERR_NO_INTFD, /*!< missing interrupt fd */ + MEMIF_ERR_DISCONNECT, /*!< disconenct received */ + MEMIF_ERR_DISCONNECTED, /*!< peer interface disconnected */ + MEMIF_ERR_UNKNOWN_MSG, /*!< unknown message type */ +} memif_err_t; + +/** + * @defgroup MEMIF_FD_EVENT Types of events that need to be watched for specific fd. + * + * @{ + */ + +/** user needs to set events that occured on fd and pass them to memif_control_fd_handler */ +#define MEMIF_FD_EVENT_READ (1 << 0) +#define MEMIF_FD_EVENT_WRITE (1 << 1) +/** inform libmemif that error occured on fd */ +#define MEMIF_FD_EVENT_ERROR (1 << 2) +/** if set, informs that fd is going to be closed (user may want to stop watching for events on this fd) */ +#define MEMIF_FD_EVENT_DEL (1 << 3) +/** update events */ +#define MEMIF_FD_EVENT_MOD (1 << 4) +/** @} */ + +/** *brief Memif connection handle + pointer of type void, pointing to internal structure +*/ +typedef void *memif_conn_handle_t; +/** + * @defgroup CALLBACKS Callback functions definitions + * + * @{ + */ + +/** \brief Memif control file descriptor update (callback function) + @param fd - new file descriptor to watch + @param events - event type(s) to watch for + + This callback is called when there is new fd to watch for events on + or if fd is about to be closed (user mey want to stop watching for events on this fd). +*/ +typedef int (memif_control_fd_update_t) (int fd, uint8_t events); + +/** \brief Memif connection status update (callback function) + @param conn - memif connection handle + @param private_ctx - private context + + Informs user about connection status connected/disconnected. + On connected -> start watching for events on interrupt fd (optional). +*/ +typedef int (memif_connection_update_t) (memif_conn_handle_t conn, + void *private_ctx); + +/** \brief Memif interrupt occured (callback function) + @param conn - memif connection handle + @param private_ctx - private context + @param qid - queue id on which interrupt occured + + Called when event is received on interrupt fd. +*/ +typedef int (memif_interrupt_t) (memif_conn_handle_t conn, void *private_ctx, + uint16_t qid); +/** @} */ + +/** + * @defgroup ARGS_N_BUFS Connection arguments and buffers + * + * @{ + */ + +/** \brief Memif connection arguments + @param socket_filename - socket filename + @param secret - otional parameter used as interface autenthication + @param num_s2m_rings - number of slave to master rings + @param num_m2s_rings - number of master to slave rings + @param buffer_size - size of buffer in shared memory + @param log2_ring_size - logarithm base 2 of ring size + @param is_master - 0 == master, 1 == slave + @param interface_id - id used to identify peer connection + @param interface_name - interface name + @param instance_name - application name + @param mode - 0 == ethernet, 1 == ip , 2 == punt/inject +*/ +typedef struct +{ + uint8_t *socket_filename; /*!< default = /run/vpp/memif.sock */ + uint8_t secret[24]; /*!< optional (interface authentication) */ + + uint8_t num_s2m_rings; /*!< default = 1 */ + uint8_t num_m2s_rings; /*!< default = 1 */ + uint16_t buffer_size; /*!< default = 2048 */ + memif_log2_ring_size_t log2_ring_size; /*!< default = 10 (1024) */ + uint8_t is_master; + + memif_interface_id_t interface_id; + uint8_t interface_name[32]; + uint8_t instance_name[32]; + memif_interface_mode_t mode:8; +} memif_conn_args_t; + +/*! memif receive mode */ +typedef enum +{ + MEMIF_RX_MODE_INTERRUPT = 0, /*!< interrupt mode */ + MEMIF_RX_MODE_POLLING /*!< polling mode */ +} memif_rx_mode_t; + +/** \brief Memif buffer + @param desc_index - ring descriptor index + @param buffer_len - shared meory buffer length + @param data_len - data length + @param data - pointer to shared memory data +*/ +typedef struct +{ + uint16_t desc_index; + uint32_t buffer_len; + uint32_t data_len; + void *data; +} memif_buffer_t; +/** @} */ + +/** + * @defgroup MEMIF_DETAILS Memif details structs + * + * @{ + */ + +/** \brief Memif queue details + @param qid - queue id + @param ring_size - size of ring buffer in sharem memory + @param buffer_size - buffer size on sharem memory +*/ +typedef struct +{ + uint8_t qid; + uint32_t ring_size; + uint16_t buffer_size; + /* add ring information */ +} memif_queue_details_t; + +/** \brief Memif details + @param if_name - interface name + @param inst_name - application name + @param remote_if_name - peer interface name + @param remote_inst_name - peer application name + @param id - connection id + @param secret - secret + @param role - 0 = master, 1 = slave + @param mode - 0 = ethernet, 1 = ip , 2 = punt/inject + @param socket_filename = socket filename + @param rx_queues_num - number of receive queues + @param tx_queues_num - number of transmit queues + @param rx_queues - struct containing receive queue details + @param tx_queues - struct containing transmit queue details + @param link_up_down - 1 = up (connected), 2 = down (disconnected) +*/ +typedef struct +{ + uint8_t *if_name; + uint8_t *inst_name; + uint8_t *remote_if_name; + uint8_t *remote_inst_name; + + uint32_t id; + uint8_t *secret; /* optional */ + uint8_t role; /* 0 = master, 1 = slave */ + uint8_t mode; /* 0 = ethernet, 1 = ip, 2 = punt/inject */ + uint8_t *socket_filename; + uint8_t rx_queues_num; + uint8_t tx_queues_num; + memif_queue_details_t *rx_queues; + memif_queue_details_t *tx_queues; + + uint8_t link_up_down; /* 1 = up, 0 = down */ +} memif_details_t; +/** @} */ + +/** + * @defgroup API_CALLS Api calls + * + * @{ + */ + +/** \biref Memif get queue event file descriptor + @param conn - memif connection handle + @param qid - queue id + @param[out] fd - returns event file descriptor + + \return memif_err_t +*/ + +int memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *fd); + +/** \brief Memif set rx mode + @param conn - memif connection handle + @param rx_mode - receive mode + @param qid - queue id + + \return memif_err_t +*/ +int memif_set_rx_mode (memif_conn_handle_t conn, memif_rx_mode_t rx_mode, + uint16_t qid); + +/** \brief Memif strerror + @param err_code - error code + + Converts error code to error message. + + \return Error string +*/ +char *memif_strerror (int err_code); + +/** \brief Memif get details + @param conn - memif conenction handle + @param md - pointer to memif details struct + @param buf - buffer containing details strings + @param buflen - length of buffer + + \return memif_err_t +*/ +int memif_get_details (memif_conn_handle_t conn, memif_details_t * md, + char *buf, ssize_t buflen); + +/** \brief Memif initialization + @param on_control_fd_update - if control fd updates inform user to watch new fd + @param app_name - application name + + if param on_control_fd_update is set to NULL, + libmemif will handle file descriptor event polling + if a valid callback is set, file descriptor event polling needs to be done by + user application, all file descriptors and event types will be passed in + this callback to user application + + Initialize internal libmemif structures. Create timerfd (used to periodically request connection by + disconnected memifs in slave mode, with no additional API call). This fd is passed to user with memif_control_fd_update_t + timer is inactive at this state. It activates with if there is at least one memif in slave mode. + + \return memif_err_t +*/ +int memif_init (memif_control_fd_update_t * on_control_fd_update, + char *app_name); + +/** \brief Memif cleanup + + Free libmemif internal allocations. + + \return 0 +*/ +int memif_cleanup (); + +/** \brief Memory interface create function + @param conn - connection handle for user app + @param args - memory interface connection arguments + @param on_connect - inform user about connected status + @param on_disconnect - inform user about disconnected status + @param on_interrupt - informs user about interrupt, if set to null user will not be notified about interrupt, user can use memif_get_queue_efd call to get interrupt fd to poll for events + @param private_ctx - private contex passed back to user with callback + + Creates memory interface. + + SLAVE-MODE - + Start timer that will send events to timerfd. If this fd is passed to memif_control_fd_handler + every disconnected memif in slave mode will send connection request. + On success new fd is passed to user with memif_control_fd_update_t. + + MASTER-MODE - + Create listener socket and pass fd to user with memif_cntrol_fd_update_t. + If this fd is passed to memif_control_fd_handler accept will be called and + new fd will be passed to user with memif_control_fd_update_t. + + + \return memif_err_t +*/ +int memif_create (memif_conn_handle_t * conn, memif_conn_args_t * args, + memif_connection_update_t * on_connect, + memif_connection_update_t * on_disconnect, + memif_interrupt_t * on_interrupt, void *private_ctx); + +/** \brief Memif control file descriptor handler + @param fd - file descriptor on which the event occured + @param events - event type(s) that occured + + If event occures on any control fd, call memif_control_fd_handler. + Internal - lib will "identify" fd (timerfd, lsitener, control) and handle event accordingly. + + FD-TYPE - + TIMERFD - + Every disconnected memif in slave mode will request connection. + LISTENER or CONTROL - + Handle socket messaging (internal connection establishment). + INTERRUPT - + Call on_interrupt callback (if set). + + \return memif_err_t + +*/ +int memif_control_fd_handler (int fd, uint8_t events); + +/** \brief Memif delete + @param conn - pointer to memif connection handle + + + disconnect session (free queues and regions, close file descriptors, unmap shared memory) + set connection handle to NULL, to avoid possible double free + + \return memif_err_t +*/ +int memif_delete (memif_conn_handle_t * conn); + +/** \brief Memif buffer alloc + @param conn - memif conenction handle + @param qid - number indentifying queue + @param bufs - memif buffers + @param count - number of memif buffers to allocate + @param count_out - returns number of allocated buffers + @param size - minimal buffer size, 0 = standard buffer size + + \return memif_err_t +*/ +int memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid, + memif_buffer_t * bufs, uint16_t count, + uint16_t * count_out, uint16_t size); + +/** \brief Memif buffer free + @param conn - memif conenction handle + @param qid - number indentifying queue + @param bufs - memif buffers + @param count - number of memif buffers to free + @param count_out - returns number of freed buffers + + \return memif_err_t +*/ +int memif_buffer_free (memif_conn_handle_t conn, uint16_t qid, + memif_buffer_t * bufs, uint16_t count, + uint16_t * count_out); + +/** \brief Memif transmit buffer burst + @param conn - memif conenction handle + @param qid - number indentifying queue + @param bufs - memif buffers + @param count - number of memif buffers to transmit + @param tx - returns number of transmitted buffers + + \return memif_err_t +*/ +int memif_tx_burst (memif_conn_handle_t conn, uint16_t qid, + memif_buffer_t * bufs, uint16_t count, uint16_t * tx); + +/** \brief Memif receive buffer burst + @param conn - memif conenction handle + @param qid - number indentifying queue + @param bufs - memif buffers + @param count - number of memif buffers to receive + @param rx - returns number of received buffers + + \return memif_err_t +*/ +int memif_rx_burst (memif_conn_handle_t conn, uint16_t qid, + memif_buffer_t * bufs, uint16_t count, uint16_t * rx); + +/** \brief Memif poll event + @param timeout - timeout in seconds + + Passive event polling - + timeout = 0 - dont wait for event, check event queue if there is an event and return. + timeout = -1 - wait until event + + \return memif_err_t +*/ +int memif_poll_event (int timeout); +/** @} */ + +#endif /* _LIBMEMIF_H_ */ |