blob: f0633e319307c7e97b6d56894da18e97e39a3c0b [file] [log] [blame]
/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
#ifndef _LIBMCTP_H
#define _LIBMCTP_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
typedef uint8_t mctp_eid_t;
/* MCTP packet definitions */
struct mctp_hdr {
uint8_t ver;
uint8_t dest;
uint8_t src;
uint8_t flags_seq_tag;
};
/* Definitions for flags_seq_tag field */
#define MCTP_HDR_FLAG_SOM (1<<7)
#define MCTP_HDR_FLAG_EOM (1<<6)
#define MCTP_HDR_FLAG_TO (1<<3)
#define MCTP_HDR_SEQ_SHIFT (4)
#define MCTP_HDR_SEQ_MASK (0x3)
#define MCTP_HDR_TAG_SHIFT (0)
#define MCTP_HDR_TAG_MASK (0x7)
/* Maximum size of *payload* data in a MCTP packet
* @todo: dynamic sixing based on channel implementation.
*/
#define MCTP_MTU 64
/* packet buffers */
/* Allow a little space before the MCTP header in the packet, for bindings that
* may add their own header
*/
#define MCTP_PKTBUF_BINDING_PAD 2
#define MCTP_PKTBUF_SIZE (MCTP_PKTBUF_BINDING_PAD + \
(sizeof(struct mctp_hdr) + MCTP_MTU))
struct mctp_pktbuf {
unsigned char data[MCTP_PKTBUF_SIZE];
uint8_t start, end;
uint8_t mctp_hdr_off;
struct mctp_pktbuf *next;
};
struct mctp_pktbuf *mctp_pktbuf_alloc(uint8_t len);
void mctp_pktbuf_free(struct mctp_pktbuf *pkt);
struct mctp_hdr *mctp_pktbuf_hdr(struct mctp_pktbuf *pkt);
void *mctp_pktbuf_data(struct mctp_pktbuf *pkt);
uint8_t mctp_pktbuf_size(struct mctp_pktbuf *pkt);
void *mctp_pktbuf_alloc_start(struct mctp_pktbuf *pkt, uint8_t size);
void *mctp_pktbuf_alloc_end(struct mctp_pktbuf *pkt, uint8_t size);
int mctp_pktbuf_push(struct mctp_pktbuf *pkt, void *data, uint8_t len);
/* MCTP core */
struct mctp;
struct mctp_bus;
struct mctp_binding;
struct mctp *mctp_init(void);
/* Register a binding to the MCTP core, and creates a bus (populating
* binding->bus).
*/
int mctp_register_bus(struct mctp *mctp,
struct mctp_binding *binding,
mctp_eid_t eid);
typedef void (*mctp_rx_fn)(uint8_t src_eid, void *data,
void *msg, size_t len);
int mctp_set_rx_all(struct mctp *mctp, mctp_rx_fn fn, void *data);
int mctp_message_tx(struct mctp *mctp, mctp_eid_t eid,
void *msg, size_t msg_len);
/* hardware bindings */
struct mctp_binding {
const char *name;
uint8_t version;
struct mctp_bus *bus;
struct mctp *mctp;
int (*tx)(struct mctp_binding *binding,
struct mctp_pktbuf *pkt);
};
void mctp_binding_set_tx_enabled(struct mctp_binding *binding, bool enable);
void mctp_bus_rx(struct mctp_binding *binding, struct mctp_pktbuf *pkt);
/* environment-specific allocation */
void mctp_set_alloc_ops(void *(*alloc)(size_t),
void (*free)(void *),
void *(realloc)(void *, size_t));
/* environment-specific logging */
void mctp_set_log_stdio(int level);
void mctp_set_log_syslog(void);
void mctp_set_log_custom(void (*fn)(int, const char *, va_list));
/* these should match the syslog-standard LOG_* definitions, for
* easier use with syslog */
#define MCTP_LOG_ERR 3
#define MCTP_LOG_WARNING 4
#define MCTP_LOG_NOTICE 5
#define MCTP_LOG_INFO 6
#define MCTP_LOG_DEBUG 7
#ifdef __cplusplus
}
#endif
#endif /* _LIBMCTP_H */