1 #include "config.h" 2 #include "libpldm/requester/pldm.h" 3 #include "base.h" 4 #include "libpldm/transport.h" 5 6 #include <bits/types/struct_iovec.h> 7 #include <stdbool.h> 8 #include <stdlib.h> 9 #include <string.h> 10 #include <sys/socket.h> 11 #include <sys/un.h> 12 #include <unistd.h> 13 14 /* Temporary for old api */ 15 #include "libpldm/transport/mctp-demux.h" 16 extern int 17 pldm_transport_mctp_demux_get_socket_fd(struct pldm_transport_mctp_demux *ctx); 18 extern struct pldm_transport_mctp_demux * 19 pldm_transport_mctp_demux_init_with_fd(int mctp_fd); 20 21 /* --- old APIS written in terms of the new API -- */ 22 /* 23 * pldm_open returns the file descriptor to the MCTP socket, which needs to 24 * persist over api calls (so a consumer can poll it for incoming messages). 25 * So we need a global variable to store the transport struct 26 */ 27 static struct pldm_transport_mctp_demux *open_transport; 28 29 LIBPLDM_ABI_STABLE 30 pldm_requester_rc_t pldm_open(void) 31 { 32 int fd; 33 int rc; 34 35 if (open_transport) { 36 fd = pldm_transport_mctp_demux_get_socket_fd(open_transport); 37 return fd; 38 } 39 40 struct pldm_transport_mctp_demux *demux = NULL; 41 rc = pldm_transport_mctp_demux_init(&demux); 42 if (rc) { 43 return rc; 44 } 45 46 fd = pldm_transport_mctp_demux_get_socket_fd(demux); 47 48 open_transport = demux; 49 50 return fd; 51 } 52 53 /* This macro does the setup and teardown required for the old API to use the 54 * new API. Since the setup/teardown logic is the same for all four send/recv 55 * functions, it makes sense to only define it once. */ 56 #define PLDM_REQ_FN(eid, fd, fn, ...) \ 57 do { \ 58 struct pldm_transport_mctp_demux *demux; \ 59 bool using_open_transport = false; \ 60 pldm_requester_rc_t rc; \ 61 pldm_tid_t tid = 1; \ 62 struct pldm_transport *ctx; \ 63 /* The fd can be for a socket we opened or one the consumer \ 64 * opened. */ \ 65 if (open_transport && \ 66 mctp_fd == pldm_transport_mctp_demux_get_socket_fd( \ 67 open_transport)) { \ 68 using_open_transport = true; \ 69 demux = open_transport; \ 70 } else { \ 71 demux = pldm_transport_mctp_demux_init_with_fd(fd); \ 72 if (!demux) { \ 73 rc = PLDM_REQUESTER_OPEN_FAIL; \ 74 goto transport_out; \ 75 } \ 76 } \ 77 ctx = pldm_transport_mctp_demux_core(demux); \ 78 rc = pldm_transport_mctp_demux_map_tid(demux, tid, eid); \ 79 if (rc) { \ 80 rc = PLDM_REQUESTER_OPEN_FAIL; \ 81 goto transport_out; \ 82 } \ 83 rc = fn(ctx, tid, __VA_ARGS__); \ 84 transport_out: \ 85 if (!using_open_transport) { \ 86 pldm_transport_mctp_demux_destroy(demux); \ 87 } \ 88 return rc; \ 89 } while (0) 90 91 LIBPLDM_ABI_STABLE 92 pldm_requester_rc_t pldm_recv_any(mctp_eid_t eid, int mctp_fd, 93 uint8_t **pldm_resp_msg, size_t *resp_msg_len) 94 { 95 PLDM_REQ_FN(eid, mctp_fd, pldm_transport_recv_msg, 96 (void **)pldm_resp_msg, resp_msg_len); 97 } 98 99 LIBPLDM_ABI_STABLE 100 pldm_requester_rc_t pldm_recv(mctp_eid_t eid, int mctp_fd, 101 __attribute__((unused)) uint8_t instance_id, 102 uint8_t **pldm_resp_msg, size_t *resp_msg_len) 103 { 104 pldm_requester_rc_t rc = 105 pldm_recv_any(eid, mctp_fd, pldm_resp_msg, resp_msg_len); 106 struct pldm_msg_hdr *hdr = (struct pldm_msg_hdr *)(*pldm_resp_msg); 107 if (hdr->instance_id != instance_id) { 108 free(*pldm_resp_msg); 109 *pldm_resp_msg = NULL; 110 return PLDM_REQUESTER_INSTANCE_ID_MISMATCH; 111 } 112 return rc; 113 } 114 115 LIBPLDM_ABI_STABLE 116 pldm_requester_rc_t pldm_send_recv(mctp_eid_t eid, int mctp_fd, 117 const uint8_t *pldm_req_msg, 118 size_t req_msg_len, uint8_t **pldm_resp_msg, 119 size_t *resp_msg_len) 120 { 121 PLDM_REQ_FN(eid, mctp_fd, pldm_transport_send_recv_msg, pldm_req_msg, 122 req_msg_len, (void **)pldm_resp_msg, resp_msg_len); 123 } 124 125 LIBPLDM_ABI_STABLE 126 pldm_requester_rc_t pldm_send(mctp_eid_t eid, int mctp_fd, 127 const uint8_t *pldm_req_msg, size_t req_msg_len) 128 { 129 PLDM_REQ_FN(eid, mctp_fd, pldm_transport_send_msg, (void *)pldm_req_msg, 130 req_msg_len); 131 } 132 133 /* Adding this here for completeness in the case we can't smoothly 134 * transition apps over to the new api */ 135 LIBPLDM_ABI_STABLE 136 void pldm_close(void) 137 { 138 if (open_transport) { 139 pldm_transport_mctp_demux_destroy(open_transport); 140 } 141 open_transport = NULL; 142 } 143