Jeremy Kerr | 3d36ee2 | 2019-05-30 11:15:37 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */ |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 2 | |
| 3 | #include <assert.h> |
Andrew Jeffery | 3e8a12a | 2020-06-05 16:08:30 +0930 | [diff] [blame] | 4 | #include <errno.h> |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 5 | #include <stdarg.h> |
| 6 | #include <stddef.h> |
| 7 | #include <stdint.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <string.h> |
| 11 | |
| 12 | #undef pr_fmt |
| 13 | #define pr_fmt(fmt) "core: " fmt |
| 14 | |
| 15 | #include "libmctp.h" |
| 16 | #include "libmctp-alloc.h" |
| 17 | #include "libmctp-log.h" |
Wiktor GoĊgowski | ba6727e | 2020-03-13 18:25:01 +0100 | [diff] [blame] | 18 | #include "libmctp-cmds.h" |
Andrew Jeffery | c2b833e | 2020-10-28 14:28:37 +1030 | [diff] [blame] | 19 | #include "range.h" |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 20 | |
| 21 | /* Internal data structures */ |
| 22 | |
| 23 | struct mctp_bus { |
| 24 | mctp_eid_t eid; |
| 25 | struct mctp_binding *binding; |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 26 | bool tx_enabled; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 27 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 28 | struct mctp_pktbuf *tx_queue_head; |
| 29 | struct mctp_pktbuf *tx_queue_tail; |
| 30 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 31 | /* todo: routing */ |
| 32 | }; |
| 33 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 34 | struct mctp_msg_ctx { |
| 35 | uint8_t src; |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 36 | uint8_t dest; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 37 | uint8_t tag; |
| 38 | uint8_t last_seq; |
| 39 | void *buf; |
| 40 | size_t buf_size; |
| 41 | size_t buf_alloc_size; |
| 42 | }; |
| 43 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 44 | struct mctp { |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 45 | int n_busses; |
| 46 | struct mctp_bus *busses; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 47 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 48 | /* Message RX callback */ |
| 49 | mctp_rx_fn message_rx; |
| 50 | void *message_rx_data; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 51 | |
| 52 | /* Message reassembly. |
| 53 | * @todo: flexible context count |
| 54 | */ |
| 55 | struct mctp_msg_ctx msg_ctxs[16]; |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 56 | |
| 57 | enum { |
| 58 | ROUTE_ENDPOINT, |
| 59 | ROUTE_BRIDGE, |
| 60 | } route_policy; |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 61 | size_t max_message_size; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 62 | }; |
| 63 | |
| 64 | #ifndef BUILD_ASSERT |
| 65 | #define BUILD_ASSERT(x) \ |
| 66 | do { (void)sizeof(char[0-(!(x))]); } while (0) |
| 67 | #endif |
| 68 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 69 | #ifndef ARRAY_SIZE |
| 70 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0])) |
| 71 | #endif |
| 72 | |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 73 | /* 64kb should be sufficient for a single message. Applications |
| 74 | * requiring higher sizes can override by setting max_message_size.*/ |
| 75 | #ifndef MCTP_MAX_MESSAGE_SIZE |
| 76 | #define MCTP_MAX_MESSAGE_SIZE 65536 |
| 77 | #endif |
| 78 | |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 79 | static int mctp_message_tx_on_bus(struct mctp_bus *bus, mctp_eid_t src, |
| 80 | mctp_eid_t dest, void *msg, size_t msg_len); |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 81 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 82 | struct mctp_pktbuf *mctp_pktbuf_alloc(struct mctp_binding *binding, size_t len) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 83 | { |
| 84 | struct mctp_pktbuf *buf; |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 85 | size_t size; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 86 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 87 | size = binding->pkt_size + binding->pkt_pad; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 88 | |
| 89 | /* todo: pools */ |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 90 | buf = __mctp_alloc(sizeof(*buf) + size); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 91 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 92 | buf->size = size; |
| 93 | buf->start = binding->pkt_pad; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 94 | buf->end = buf->start + len; |
| 95 | buf->mctp_hdr_off = buf->start; |
Jeremy Kerr | dd109f1 | 2019-04-04 11:46:49 +0800 | [diff] [blame] | 96 | buf->next = NULL; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 97 | |
| 98 | return buf; |
| 99 | } |
| 100 | |
| 101 | void mctp_pktbuf_free(struct mctp_pktbuf *pkt) |
| 102 | { |
| 103 | __mctp_free(pkt); |
| 104 | } |
| 105 | |
| 106 | struct mctp_hdr *mctp_pktbuf_hdr(struct mctp_pktbuf *pkt) |
| 107 | { |
| 108 | return (void *)pkt->data + pkt->mctp_hdr_off; |
| 109 | } |
| 110 | |
| 111 | void *mctp_pktbuf_data(struct mctp_pktbuf *pkt) |
| 112 | { |
| 113 | return (void *)pkt->data + pkt->mctp_hdr_off + sizeof(struct mctp_hdr); |
| 114 | } |
| 115 | |
Andrew Jeffery | b942e3a | 2020-06-23 09:54:02 +0930 | [diff] [blame] | 116 | size_t mctp_pktbuf_size(struct mctp_pktbuf *pkt) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 117 | { |
| 118 | return pkt->end - pkt->start; |
| 119 | } |
| 120 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 121 | void *mctp_pktbuf_alloc_start(struct mctp_pktbuf *pkt, size_t size) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 122 | { |
| 123 | assert(size <= pkt->start); |
| 124 | pkt->start -= size; |
| 125 | return pkt->data + pkt->start; |
| 126 | } |
| 127 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 128 | void *mctp_pktbuf_alloc_end(struct mctp_pktbuf *pkt, size_t size) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 129 | { |
| 130 | void *buf; |
| 131 | |
Andrew Jeffery | 3ac70d6 | 2020-07-01 00:50:44 +0930 | [diff] [blame] | 132 | assert(size <= (pkt->size - pkt->end)); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 133 | buf = pkt->data + pkt->end; |
| 134 | pkt->end += size; |
| 135 | return buf; |
| 136 | } |
| 137 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 138 | int mctp_pktbuf_push(struct mctp_pktbuf *pkt, void *data, size_t len) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 139 | { |
| 140 | void *p; |
| 141 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 142 | if (pkt->end + len > pkt->size) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 143 | return -1; |
| 144 | |
| 145 | p = pkt->data + pkt->end; |
| 146 | |
| 147 | pkt->end += len; |
| 148 | memcpy(p, data, len); |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 153 | /* Message reassembly */ |
| 154 | static struct mctp_msg_ctx *mctp_msg_ctx_lookup(struct mctp *mctp, |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 155 | uint8_t src, uint8_t dest, uint8_t tag) |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 156 | { |
| 157 | unsigned int i; |
| 158 | |
| 159 | /* @todo: better lookup, if we add support for more outstanding |
| 160 | * message contexts */ |
| 161 | for (i = 0; i < ARRAY_SIZE(mctp->msg_ctxs); i++) { |
| 162 | struct mctp_msg_ctx *ctx = &mctp->msg_ctxs[i]; |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 163 | if (ctx->src == src && ctx->dest == dest && ctx->tag == tag) |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 164 | return ctx; |
| 165 | } |
| 166 | |
| 167 | return NULL; |
| 168 | } |
| 169 | |
| 170 | static struct mctp_msg_ctx *mctp_msg_ctx_create(struct mctp *mctp, |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 171 | uint8_t src, uint8_t dest, uint8_t tag) |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 172 | { |
Jeremy Kerr | 11a234e | 2019-02-27 17:59:53 +0800 | [diff] [blame] | 173 | struct mctp_msg_ctx *ctx = NULL; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 174 | unsigned int i; |
| 175 | |
| 176 | for (i = 0; i < ARRAY_SIZE(mctp->msg_ctxs); i++) { |
| 177 | struct mctp_msg_ctx *tmp = &mctp->msg_ctxs[i]; |
| 178 | if (!tmp->src) { |
| 179 | ctx = tmp; |
| 180 | break; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | if (!ctx) |
| 185 | return NULL; |
| 186 | |
| 187 | ctx->src = src; |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 188 | ctx->dest = dest; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 189 | ctx->tag = tag; |
Jeremy Kerr | 9a3da81 | 2019-08-02 15:57:53 +0800 | [diff] [blame] | 190 | ctx->buf_size = 0; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 191 | |
| 192 | return ctx; |
| 193 | } |
| 194 | |
| 195 | static void mctp_msg_ctx_drop(struct mctp_msg_ctx *ctx) |
| 196 | { |
| 197 | ctx->src = 0; |
| 198 | } |
| 199 | |
| 200 | static void mctp_msg_ctx_reset(struct mctp_msg_ctx *ctx) |
| 201 | { |
| 202 | ctx->buf_size = 0; |
| 203 | } |
| 204 | |
| 205 | static int mctp_msg_ctx_add_pkt(struct mctp_msg_ctx *ctx, |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 206 | struct mctp_pktbuf *pkt, size_t max_size) |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 207 | { |
| 208 | size_t len; |
| 209 | |
| 210 | len = mctp_pktbuf_size(pkt) - sizeof(struct mctp_hdr); |
| 211 | |
| 212 | if (ctx->buf_size + len > ctx->buf_alloc_size) { |
| 213 | size_t new_alloc_size; |
Andrew Jeffery | 00ecc6c | 2020-03-10 23:16:53 +1030 | [diff] [blame] | 214 | void *lbuf; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 215 | |
Andrew Jeffery | 5a50891 | 2020-11-03 22:21:45 +1030 | [diff] [blame] | 216 | /* @todo: finer-grained allocation */ |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 217 | if (!ctx->buf_alloc_size) { |
Andrew Jeffery | c2b833e | 2020-10-28 14:28:37 +1030 | [diff] [blame] | 218 | new_alloc_size = MAX(len, 4096UL); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 219 | } else { |
| 220 | new_alloc_size = ctx->buf_alloc_size * 2; |
| 221 | } |
Andrew Jeffery | 00ecc6c | 2020-03-10 23:16:53 +1030 | [diff] [blame] | 222 | |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 223 | /* Don't allow heap to grow beyond a limit */ |
| 224 | if (new_alloc_size > max_size) |
| 225 | return -1; |
| 226 | |
| 227 | |
Andrew Jeffery | 00ecc6c | 2020-03-10 23:16:53 +1030 | [diff] [blame] | 228 | lbuf = __mctp_realloc(ctx->buf, new_alloc_size); |
| 229 | if (lbuf) { |
| 230 | ctx->buf = lbuf; |
| 231 | ctx->buf_alloc_size = new_alloc_size; |
| 232 | } else { |
| 233 | __mctp_free(ctx->buf); |
| 234 | return -1; |
| 235 | } |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | memcpy(ctx->buf + ctx->buf_size, mctp_pktbuf_data(pkt), len); |
| 239 | ctx->buf_size += len; |
| 240 | |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | /* Core API functions */ |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 245 | struct mctp *mctp_init(void) |
| 246 | { |
| 247 | struct mctp *mctp; |
| 248 | |
| 249 | mctp = __mctp_alloc(sizeof(*mctp)); |
Sumanth Bhat | 96d5449 | 2020-07-14 17:10:04 +0530 | [diff] [blame] | 250 | |
| 251 | if(!mctp) |
| 252 | return NULL; |
| 253 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 254 | memset(mctp, 0, sizeof(*mctp)); |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 255 | mctp->max_message_size = MCTP_MAX_MESSAGE_SIZE; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 256 | |
| 257 | return mctp; |
| 258 | } |
| 259 | |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 260 | void mctp_set_max_message_size(struct mctp *mctp, size_t message_size) |
| 261 | { |
| 262 | mctp->max_message_size = message_size; |
| 263 | } |
| 264 | |
Andrew Jeffery | fa56ca5 | 2020-03-10 23:18:22 +1030 | [diff] [blame] | 265 | void mctp_destroy(struct mctp *mctp) |
| 266 | { |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 267 | size_t i; |
Andrew Jeffery | fa56ca5 | 2020-03-10 23:18:22 +1030 | [diff] [blame] | 268 | |
| 269 | /* Cleanup message assembly contexts */ |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 270 | BUILD_ASSERT(ARRAY_SIZE(mctp->msg_ctxs) < SIZE_MAX); |
Andrew Jeffery | fa56ca5 | 2020-03-10 23:18:22 +1030 | [diff] [blame] | 271 | for (i = 0; i < ARRAY_SIZE(mctp->msg_ctxs); i++) { |
| 272 | struct mctp_msg_ctx *tmp = &mctp->msg_ctxs[i]; |
| 273 | if (tmp->buf) |
| 274 | __mctp_free(tmp->buf); |
| 275 | } |
| 276 | |
| 277 | __mctp_free(mctp->busses); |
| 278 | __mctp_free(mctp); |
| 279 | } |
| 280 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 281 | int mctp_set_rx_all(struct mctp *mctp, mctp_rx_fn fn, void *data) |
| 282 | { |
| 283 | mctp->message_rx = fn; |
| 284 | mctp->message_rx_data = data; |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | static struct mctp_bus *find_bus_for_eid(struct mctp *mctp, |
| 289 | mctp_eid_t dest __attribute__((unused))) |
| 290 | { |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 291 | /* for now, just use the first bus. For full routing support, |
| 292 | * we will need a table of neighbours */ |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 293 | return &mctp->busses[0]; |
| 294 | } |
| 295 | |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 296 | int mctp_register_bus(struct mctp *mctp, |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 297 | struct mctp_binding *binding, |
| 298 | mctp_eid_t eid) |
| 299 | { |
Andrew Jeffery | 3e8a12a | 2020-06-05 16:08:30 +0930 | [diff] [blame] | 300 | int rc = 0; |
| 301 | |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 302 | /* todo: multiple busses */ |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 303 | assert(mctp->n_busses == 0); |
| 304 | mctp->n_busses = 1; |
Andrew Jeffery | 3e8a12a | 2020-06-05 16:08:30 +0930 | [diff] [blame] | 305 | |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 306 | mctp->busses = __mctp_alloc(sizeof(struct mctp_bus)); |
Andrew Jeffery | 3e8a12a | 2020-06-05 16:08:30 +0930 | [diff] [blame] | 307 | if (!mctp->busses) |
| 308 | return -ENOMEM; |
| 309 | |
James Feist | 62d7236 | 2019-12-13 13:43:32 -0800 | [diff] [blame] | 310 | memset(mctp->busses, 0, sizeof(struct mctp_bus)); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 311 | mctp->busses[0].binding = binding; |
| 312 | mctp->busses[0].eid = eid; |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 313 | binding->bus = &mctp->busses[0]; |
Jeremy Kerr | 0a00dca | 2019-03-01 08:01:35 +0800 | [diff] [blame] | 314 | binding->mctp = mctp; |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 315 | mctp->route_policy = ROUTE_ENDPOINT; |
Jeremy Kerr | 3b36d17 | 2019-09-04 11:56:09 +0800 | [diff] [blame] | 316 | |
Andrew Jeffery | 3e8a12a | 2020-06-05 16:08:30 +0930 | [diff] [blame] | 317 | if (binding->start) { |
| 318 | rc = binding->start(binding); |
| 319 | if (rc < 0) { |
| 320 | mctp_prerr("Failed to start binding: %d", rc); |
| 321 | __mctp_free(mctp->busses); |
| 322 | mctp->busses = NULL; |
Andrew Jeffery | 2304c83 | 2021-01-29 11:52:49 +1030 | [diff] [blame^] | 323 | mctp->n_busses = 0; |
Andrew Jeffery | 3e8a12a | 2020-06-05 16:08:30 +0930 | [diff] [blame] | 324 | } |
| 325 | } |
Jeremy Kerr | 3b36d17 | 2019-09-04 11:56:09 +0800 | [diff] [blame] | 326 | |
Andrew Jeffery | 3e8a12a | 2020-06-05 16:08:30 +0930 | [diff] [blame] | 327 | return rc; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 328 | } |
| 329 | |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 330 | int mctp_bridge_busses(struct mctp *mctp, |
| 331 | struct mctp_binding *b1, struct mctp_binding *b2) |
| 332 | { |
| 333 | assert(mctp->n_busses == 0); |
| 334 | mctp->busses = __mctp_alloc(2 * sizeof(struct mctp_bus)); |
James Feist | 62d7236 | 2019-12-13 13:43:32 -0800 | [diff] [blame] | 335 | memset(mctp->busses, 0, 2 * sizeof(struct mctp_bus)); |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 336 | mctp->n_busses = 2; |
| 337 | mctp->busses[0].binding = b1; |
| 338 | b1->bus = &mctp->busses[0]; |
| 339 | b1->mctp = mctp; |
| 340 | mctp->busses[1].binding = b2; |
| 341 | b2->bus = &mctp->busses[1]; |
| 342 | b2->mctp = mctp; |
| 343 | |
| 344 | mctp->route_policy = ROUTE_BRIDGE; |
Jeremy Kerr | 3b36d17 | 2019-09-04 11:56:09 +0800 | [diff] [blame] | 345 | |
| 346 | if (b1->start) |
| 347 | b1->start(b1); |
| 348 | |
| 349 | if (b2->start) |
| 350 | b2->start(b2); |
| 351 | |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 352 | return 0; |
| 353 | } |
| 354 | |
Wiktor GoĊgowski | ba6727e | 2020-03-13 18:25:01 +0100 | [diff] [blame] | 355 | static inline bool mctp_ctrl_cmd_is_transport(struct mctp_ctrl_msg_hdr *hdr) |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 356 | { |
Wiktor GoĊgowski | ba6727e | 2020-03-13 18:25:01 +0100 | [diff] [blame] | 357 | return ((hdr->command_code >= MCTP_CTRL_CMD_FIRST_TRANSPORT) && |
| 358 | (hdr->command_code <= MCTP_CTRL_CMD_LAST_TRANSPORT)); |
| 359 | } |
| 360 | |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 361 | static bool mctp_ctrl_handle_msg(struct mctp_bus *bus, mctp_eid_t src, |
| 362 | void *buffer, size_t length) |
Wiktor GoĊgowski | ba6727e | 2020-03-13 18:25:01 +0100 | [diff] [blame] | 363 | { |
| 364 | struct mctp_ctrl_msg_hdr *msg_hdr = buffer; |
| 365 | |
| 366 | /* |
| 367 | * Control message is received. If a transport control message handler |
| 368 | * is provided, it will called. If there is no dedicated handler, this |
| 369 | * function returns false and data can be handled by the generic |
| 370 | * message handler. The transport control message handler will be |
| 371 | * provided with messages in the command range 0xF0 - 0xFF. |
| 372 | */ |
| 373 | if (mctp_ctrl_cmd_is_transport(msg_hdr)) { |
| 374 | if (bus->binding->control_rx != NULL) { |
| 375 | /* MCTP bus binding handler */ |
| 376 | bus->binding->control_rx(src, |
| 377 | bus->binding->control_rx_data, |
| 378 | buffer, length); |
| 379 | return true; |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Command was not handled, due to lack of specific callback. |
| 385 | * It will be passed to regular message_rx handler. |
| 386 | */ |
| 387 | return false; |
| 388 | } |
| 389 | |
| 390 | static inline bool mctp_rx_dest_is_local(struct mctp_bus *bus, mctp_eid_t dest) |
| 391 | { |
| 392 | return dest == bus->eid || dest == MCTP_EID_NULL || |
| 393 | dest == MCTP_EID_BROADCAST; |
| 394 | } |
| 395 | |
| 396 | static inline bool mctp_ctrl_cmd_is_request(struct mctp_ctrl_msg_hdr *hdr) |
| 397 | { |
| 398 | return hdr->ic_msg_type == MCTP_CTRL_HDR_MSG_TYPE && |
| 399 | hdr->rq_dgram_inst & MCTP_CTRL_HDR_FLAG_REQUEST; |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Receive the complete MCTP message and route it. |
| 404 | * Asserts: |
| 405 | * 'buf' is not NULL. |
| 406 | */ |
| 407 | static void mctp_rx(struct mctp *mctp, struct mctp_bus *bus, mctp_eid_t src, |
| 408 | mctp_eid_t dest, void *buf, size_t len) |
| 409 | { |
| 410 | assert(buf != NULL); |
| 411 | |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 412 | if (mctp->route_policy == ROUTE_ENDPOINT && |
Wiktor GoĊgowski | ba6727e | 2020-03-13 18:25:01 +0100 | [diff] [blame] | 413 | mctp_rx_dest_is_local(bus, dest)) { |
| 414 | /* Handle MCTP Control Messages: */ |
| 415 | if (len >= sizeof(struct mctp_ctrl_msg_hdr)) { |
| 416 | struct mctp_ctrl_msg_hdr *msg_hdr = buf; |
| 417 | |
| 418 | /* |
| 419 | * Identify if this is a control request message. |
| 420 | * See DSP0236 v1.3.0 sec. 11.5. |
| 421 | */ |
| 422 | if (mctp_ctrl_cmd_is_request(msg_hdr)) { |
| 423 | bool handled; |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 424 | handled = mctp_ctrl_handle_msg(bus, src, buf, |
| 425 | len); |
Wiktor GoĊgowski | ba6727e | 2020-03-13 18:25:01 +0100 | [diff] [blame] | 426 | if (handled) |
| 427 | return; |
| 428 | } |
| 429 | } |
| 430 | if (mctp->message_rx) |
| 431 | mctp->message_rx(src, mctp->message_rx_data, buf, len); |
| 432 | } |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 433 | |
| 434 | if (mctp->route_policy == ROUTE_BRIDGE) { |
| 435 | int i; |
| 436 | |
| 437 | for (i = 0; i < mctp->n_busses; i++) { |
| 438 | struct mctp_bus *dest_bus = &mctp->busses[i]; |
| 439 | if (dest_bus == bus) |
| 440 | continue; |
| 441 | |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 442 | mctp_message_tx_on_bus(dest_bus, src, dest, buf, len); |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | } |
| 446 | } |
| 447 | |
Jeremy Kerr | 0a00dca | 2019-03-01 08:01:35 +0800 | [diff] [blame] | 448 | void mctp_bus_rx(struct mctp_binding *binding, struct mctp_pktbuf *pkt) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 449 | { |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 450 | struct mctp_bus *bus = binding->bus; |
Jeremy Kerr | 0a00dca | 2019-03-01 08:01:35 +0800 | [diff] [blame] | 451 | struct mctp *mctp = binding->mctp; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 452 | uint8_t flags, exp_seq, seq, tag; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 453 | struct mctp_msg_ctx *ctx; |
| 454 | struct mctp_hdr *hdr; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 455 | size_t len; |
| 456 | void *p; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 457 | int rc; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 458 | |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 459 | assert(bus); |
| 460 | |
Sumanth Bhat | d97869d | 2020-07-02 00:46:13 +0530 | [diff] [blame] | 461 | /* Drop packet if it was smaller than mctp hdr size */ |
| 462 | if (mctp_pktbuf_size(pkt) <= sizeof(struct mctp_hdr)) |
| 463 | goto out; |
| 464 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 465 | hdr = mctp_pktbuf_hdr(pkt); |
| 466 | |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 467 | /* small optimisation: don't bother reassembly if we're going to |
| 468 | * drop the packet in mctp_rx anyway */ |
| 469 | if (mctp->route_policy == ROUTE_ENDPOINT && hdr->dest != bus->eid) |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 470 | goto out; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 471 | |
| 472 | flags = hdr->flags_seq_tag & (MCTP_HDR_FLAG_SOM | MCTP_HDR_FLAG_EOM); |
| 473 | tag = (hdr->flags_seq_tag >> MCTP_HDR_TAG_SHIFT) & MCTP_HDR_TAG_MASK; |
| 474 | seq = (hdr->flags_seq_tag >> MCTP_HDR_SEQ_SHIFT) & MCTP_HDR_SEQ_MASK; |
| 475 | |
| 476 | switch (flags) { |
| 477 | case MCTP_HDR_FLAG_SOM | MCTP_HDR_FLAG_EOM: |
| 478 | /* single-packet message - send straight up to rx function, |
| 479 | * no need to create a message context */ |
| 480 | len = pkt->end - pkt->mctp_hdr_off - sizeof(struct mctp_hdr); |
Andrew Jeffery | b4ae00b | 2021-01-18 15:52:09 +1030 | [diff] [blame] | 481 | p = pkt->data + pkt->mctp_hdr_off + sizeof(struct mctp_hdr); |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 482 | mctp_rx(mctp, bus, hdr->src, hdr->dest, p, len); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 483 | break; |
| 484 | |
| 485 | case MCTP_HDR_FLAG_SOM: |
| 486 | /* start of a new message - start the new context for |
| 487 | * future message reception. If an existing context is |
| 488 | * already present, drop it. */ |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 489 | ctx = mctp_msg_ctx_lookup(mctp, hdr->src, hdr->dest, tag); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 490 | if (ctx) { |
| 491 | mctp_msg_ctx_reset(ctx); |
| 492 | } else { |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 493 | ctx = mctp_msg_ctx_create(mctp, |
| 494 | hdr->src, hdr->dest, tag); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 495 | } |
| 496 | |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 497 | rc = mctp_msg_ctx_add_pkt(ctx, pkt, mctp->max_message_size); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 498 | if (rc) { |
| 499 | mctp_msg_ctx_drop(ctx); |
| 500 | } else { |
| 501 | ctx->last_seq = seq; |
| 502 | } |
| 503 | |
| 504 | break; |
| 505 | |
| 506 | case MCTP_HDR_FLAG_EOM: |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 507 | ctx = mctp_msg_ctx_lookup(mctp, hdr->src, hdr->dest, tag); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 508 | if (!ctx) |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 509 | goto out; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 510 | |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 511 | exp_seq = (ctx->last_seq + 1) % 4; |
| 512 | |
| 513 | if (exp_seq != seq) { |
| 514 | mctp_prdebug( |
| 515 | "Sequence number %d does not match expected %d", |
| 516 | seq, exp_seq); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 517 | mctp_msg_ctx_drop(ctx); |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 518 | goto out; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 519 | } |
| 520 | |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 521 | rc = mctp_msg_ctx_add_pkt(ctx, pkt, mctp->max_message_size); |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 522 | if (!rc) |
| 523 | mctp_rx(mctp, bus, ctx->src, ctx->dest, |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 524 | ctx->buf, ctx->buf_size); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 525 | |
| 526 | mctp_msg_ctx_drop(ctx); |
| 527 | break; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 528 | |
| 529 | case 0: |
| 530 | /* Neither SOM nor EOM */ |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 531 | ctx = mctp_msg_ctx_lookup(mctp, hdr->src,hdr->dest, tag); |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 532 | if (!ctx) |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 533 | goto out; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 534 | |
| 535 | exp_seq = (ctx->last_seq + 1) % 4; |
| 536 | if (exp_seq != seq) { |
| 537 | mctp_prdebug( |
| 538 | "Sequence number %d does not match expected %d", |
| 539 | seq, exp_seq); |
| 540 | mctp_msg_ctx_drop(ctx); |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 541 | goto out; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 542 | } |
| 543 | |
Sumanth Bhat | 2c820c5 | 2020-07-02 00:26:25 +0530 | [diff] [blame] | 544 | rc = mctp_msg_ctx_add_pkt(ctx, pkt, mctp->max_message_size); |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 545 | if (rc) { |
| 546 | mctp_msg_ctx_drop(ctx); |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 547 | goto out; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 548 | } |
| 549 | ctx->last_seq = seq; |
| 550 | |
| 551 | break; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 552 | } |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 553 | out: |
| 554 | mctp_pktbuf_free(pkt); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 555 | } |
| 556 | |
Jeremy Kerr | 0a00dca | 2019-03-01 08:01:35 +0800 | [diff] [blame] | 557 | static int mctp_packet_tx(struct mctp_bus *bus, |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 558 | struct mctp_pktbuf *pkt) |
| 559 | { |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 560 | if (!bus->tx_enabled) |
| 561 | return -1; |
| 562 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 563 | return bus->binding->tx(bus->binding, pkt); |
| 564 | } |
| 565 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 566 | static void mctp_send_tx_queue(struct mctp_bus *bus) |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 567 | { |
| 568 | struct mctp_pktbuf *pkt; |
| 569 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 570 | while ((pkt = bus->tx_queue_head)) { |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 571 | int rc; |
| 572 | |
| 573 | rc = mctp_packet_tx(bus, pkt); |
| 574 | if (rc) |
| 575 | break; |
| 576 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 577 | bus->tx_queue_head = pkt->next; |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 578 | mctp_pktbuf_free(pkt); |
| 579 | } |
| 580 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 581 | if (!bus->tx_queue_head) |
| 582 | bus->tx_queue_tail = NULL; |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 583 | |
| 584 | } |
| 585 | |
| 586 | void mctp_binding_set_tx_enabled(struct mctp_binding *binding, bool enable) |
| 587 | { |
| 588 | struct mctp_bus *bus = binding->bus; |
| 589 | bus->tx_enabled = enable; |
| 590 | if (enable) |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 591 | mctp_send_tx_queue(bus); |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 592 | } |
| 593 | |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 594 | static int mctp_message_tx_on_bus(struct mctp_bus *bus, mctp_eid_t src, |
| 595 | mctp_eid_t dest, void *msg, size_t msg_len) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 596 | { |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 597 | size_t max_payload_len, payload_len, p; |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 598 | struct mctp_pktbuf *pkt; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 599 | struct mctp_hdr *hdr; |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 600 | int i; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 601 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 602 | max_payload_len = bus->binding->pkt_size - sizeof(*hdr); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 603 | |
Andrew Jeffery | 298865f | 2020-02-06 11:51:29 +1030 | [diff] [blame] | 604 | mctp_prdebug("%s: Generating packets for transmission of %zu byte message from %hhu to %hhu", |
| 605 | __func__, msg_len, src, dest); |
| 606 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 607 | /* queue up packets, each of max MCTP_MTU size */ |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 608 | for (p = 0, i = 0; p < msg_len; i++) { |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 609 | payload_len = msg_len - p; |
| 610 | if (payload_len > max_payload_len) |
| 611 | payload_len = max_payload_len; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 612 | |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 613 | pkt = mctp_pktbuf_alloc(bus->binding, |
| 614 | payload_len + sizeof(*hdr)); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 615 | hdr = mctp_pktbuf_hdr(pkt); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 616 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 617 | /* todo: tags */ |
| 618 | hdr->ver = bus->binding->version & 0xf; |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 619 | hdr->dest = dest; |
| 620 | hdr->src = src; |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 621 | hdr->flags_seq_tag = MCTP_HDR_FLAG_TO | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 622 | (0 << MCTP_HDR_TAG_SHIFT); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 623 | |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 624 | if (i == 0) |
| 625 | hdr->flags_seq_tag |= MCTP_HDR_FLAG_SOM; |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 626 | if (p + payload_len >= msg_len) |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 627 | hdr->flags_seq_tag |= MCTP_HDR_FLAG_EOM; |
| 628 | hdr->flags_seq_tag |= |
| 629 | (i & MCTP_HDR_SEQ_MASK) << MCTP_HDR_SEQ_SHIFT; |
| 630 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 631 | memcpy(mctp_pktbuf_data(pkt), msg + p, payload_len); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 632 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 633 | /* add to tx queue */ |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 634 | if (bus->tx_queue_tail) |
| 635 | bus->tx_queue_tail->next = pkt; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 636 | else |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 637 | bus->tx_queue_head = pkt; |
| 638 | bus->tx_queue_tail = pkt; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 639 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 640 | p += payload_len; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 641 | } |
| 642 | |
Andrew Jeffery | 298865f | 2020-02-06 11:51:29 +1030 | [diff] [blame] | 643 | mctp_prdebug("%s: Enqueued %d packets", __func__, i); |
| 644 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 645 | mctp_send_tx_queue(bus); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 646 | |
| 647 | return 0; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 648 | } |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 649 | |
| 650 | int mctp_message_tx(struct mctp *mctp, mctp_eid_t eid, |
| 651 | void *msg, size_t msg_len) |
| 652 | { |
| 653 | struct mctp_bus *bus; |
| 654 | |
| 655 | bus = find_bus_for_eid(mctp, eid); |
Andrew Jeffery | b93b611 | 2020-06-05 14:13:44 +0930 | [diff] [blame] | 656 | return mctp_message_tx_on_bus(bus, bus->eid, eid, msg, msg_len); |
Jeremy Kerr | 1a4ec3c | 2019-09-03 11:01:50 +0800 | [diff] [blame] | 657 | } |