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/*
* Copyright Runtime.io 2018. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef H_ZEPHYR_SMP_
#define H_ZEPHYR_SMP_
#ifdef __cplusplus
extern "C" {
#endif
struct zephyr_smp_transport;
struct net_buf;
/** @typedef zephyr_smp_transport_out_fn
* @brief SMP transmit function for Zephyr.
*
* The supplied net_buf is always consumed, regardless of return code.
*
* @param mst The transport to send via.
* @param nb The net_buf to transmit.
*
* @return 0 on success, MGMT_ERR_[...] code on failure.
*/
typedef int zephyr_smp_transport_out_fn(struct zephyr_smp_transport *zst,
struct net_buf *nb);
/** @typedef zephyr_smp_transport_get_mtu_fn
* @brief SMP MTU query function for Zephyr.
*
* The supplied net_buf should contain a request received from the peer whose
* MTU is being queried. This function takes a net_buf parameter because some
* transports store connection-specific information in the net_buf user header
* (e.g., the BLE transport stores the peer address).
*
* @param nb Contains a request from the relevant peer.
*
* @return The transport's MTU;
* 0 if transmission is currently not possible.
*/
typedef uint16_t zephyr_smp_transport_get_mtu_fn(const struct net_buf *nb);
/** @typedef zephyr_smp_transport_ud_copy_fn
* @brief SMP copy buffer user_data function for Zephyr.
*
* The supplied src net_buf should contain a user_data that cannot be copied
* using regular memcpy function (e.g., the BLE transport net_buf user_data
* stores the connection reference that has to be incremented when is going
* to be used by another buffer).
*
* @param dst Source buffer user_data pointer.
* @param src Destination buffer user_data pointer.
*
* @return 0 on success, MGMT_ERR_[...] code on failure.
*/
typedef int zephyr_smp_transport_ud_copy_fn(struct net_buf *dst,
const struct net_buf *src);
/** @typedef zephyr_smp_transport_ud_free_fn
* @brief SMP free buffer user_data function for Zephyr.
*
* This function frees net_buf user data, because some transports store
* connection-specific information in the net_buf user data (e.g., the BLE
* transport stores the connection reference that has to be decreased).
*
* @param nb Contains a user_data pointer to be freed.
*/
typedef void zephyr_smp_transport_ud_free_fn(void *ud);
/**
* @brief Provides Zephyr-specific functionality for sending SMP responses.
*/
struct zephyr_smp_transport {
/* Must be the first member. */
struct k_work zst_work;
/* FIFO containing incoming requests to be processed. */
struct k_fifo zst_fifo;
zephyr_smp_transport_out_fn *zst_output;
zephyr_smp_transport_get_mtu_fn *zst_get_mtu;
zephyr_smp_transport_ud_copy_fn *zst_ud_copy;
zephyr_smp_transport_ud_free_fn *zst_ud_free;
};
/**
* @brief Initializes a Zephyr SMP transport object.
*
* @param zst The transport to construct.
* @param output_func The transport's send function.
* @param get_mtu_func The transport's get-MTU function.
* @param ud_copy_func The transport buffer user_data copy function.
* @param ud_free_func The transport buffer user_data free function.
*
* @return 0 on success, MGMT_ERR_[...] code on failure.
*/
void zephyr_smp_transport_init(struct zephyr_smp_transport *zst,
zephyr_smp_transport_out_fn *output_func,
zephyr_smp_transport_get_mtu_fn *get_mtu_func,
zephyr_smp_transport_ud_copy_fn *ud_copy_func,
zephyr_smp_transport_ud_free_fn *ud_free_func);
/**
* @brief Enqueues an incoming SMP request packet for processing.
*
* This function always consumes the supplied net_buf.
*
* @param zst The transport to use to send the corresponding
* response(s).
* @param nb The request packet to process.
*/
void zephyr_smp_rx_req(struct zephyr_smp_transport *zst, struct net_buf *nb);
#ifdef __cplusplus
}
#endif
#endif