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> |
| 4 | #include <stdarg.h> |
| 5 | #include <stddef.h> |
| 6 | #include <stdint.h> |
| 7 | #include <stdio.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <string.h> |
| 10 | |
| 11 | #undef pr_fmt |
| 12 | #define pr_fmt(fmt) "core: " fmt |
| 13 | |
| 14 | #include "libmctp.h" |
| 15 | #include "libmctp-alloc.h" |
| 16 | #include "libmctp-log.h" |
| 17 | |
| 18 | /* Internal data structures */ |
| 19 | |
| 20 | struct mctp_bus { |
| 21 | mctp_eid_t eid; |
| 22 | struct mctp_binding *binding; |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 23 | bool tx_enabled; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 24 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 25 | struct mctp_pktbuf *tx_queue_head; |
| 26 | struct mctp_pktbuf *tx_queue_tail; |
| 27 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 28 | /* todo: routing */ |
| 29 | }; |
| 30 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 31 | struct mctp_msg_ctx { |
| 32 | uint8_t src; |
| 33 | uint8_t tag; |
| 34 | uint8_t last_seq; |
| 35 | void *buf; |
| 36 | size_t buf_size; |
| 37 | size_t buf_alloc_size; |
| 38 | }; |
| 39 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 40 | struct mctp { |
| 41 | /* todo: multiple busses */ |
| 42 | struct mctp_bus busses[1]; |
| 43 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 44 | /* Message RX callback */ |
| 45 | mctp_rx_fn message_rx; |
| 46 | void *message_rx_data; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 47 | |
| 48 | /* Message reassembly. |
| 49 | * @todo: flexible context count |
| 50 | */ |
| 51 | struct mctp_msg_ctx msg_ctxs[16]; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 52 | }; |
| 53 | |
| 54 | #ifndef BUILD_ASSERT |
| 55 | #define BUILD_ASSERT(x) \ |
| 56 | do { (void)sizeof(char[0-(!(x))]); } while (0) |
| 57 | #endif |
| 58 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 59 | #ifndef ARRAY_SIZE |
| 60 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0])) |
| 61 | #endif |
| 62 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 63 | 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] | 64 | { |
| 65 | struct mctp_pktbuf *buf; |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 66 | size_t size; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 67 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 68 | size = binding->pkt_size + binding->pkt_pad; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 69 | |
| 70 | /* todo: pools */ |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 71 | buf = __mctp_alloc(sizeof(*buf) + size); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 72 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 73 | buf->size = size; |
| 74 | buf->start = binding->pkt_pad; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 75 | buf->end = buf->start + len; |
| 76 | buf->mctp_hdr_off = buf->start; |
Jeremy Kerr | dd109f1 | 2019-04-04 11:46:49 +0800 | [diff] [blame] | 77 | buf->next = NULL; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 78 | |
| 79 | return buf; |
| 80 | } |
| 81 | |
| 82 | void mctp_pktbuf_free(struct mctp_pktbuf *pkt) |
| 83 | { |
| 84 | __mctp_free(pkt); |
| 85 | } |
| 86 | |
| 87 | struct mctp_hdr *mctp_pktbuf_hdr(struct mctp_pktbuf *pkt) |
| 88 | { |
| 89 | return (void *)pkt->data + pkt->mctp_hdr_off; |
| 90 | } |
| 91 | |
| 92 | void *mctp_pktbuf_data(struct mctp_pktbuf *pkt) |
| 93 | { |
| 94 | return (void *)pkt->data + pkt->mctp_hdr_off + sizeof(struct mctp_hdr); |
| 95 | } |
| 96 | |
| 97 | uint8_t mctp_pktbuf_size(struct mctp_pktbuf *pkt) |
| 98 | { |
| 99 | return pkt->end - pkt->start; |
| 100 | } |
| 101 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 102 | void *mctp_pktbuf_alloc_start(struct mctp_pktbuf *pkt, size_t size) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 103 | { |
| 104 | assert(size <= pkt->start); |
| 105 | pkt->start -= size; |
| 106 | return pkt->data + pkt->start; |
| 107 | } |
| 108 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 109 | void *mctp_pktbuf_alloc_end(struct mctp_pktbuf *pkt, size_t size) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 110 | { |
| 111 | void *buf; |
| 112 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 113 | assert(size < (pkt->size - pkt->end)); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 114 | buf = pkt->data + pkt->end; |
| 115 | pkt->end += size; |
| 116 | return buf; |
| 117 | } |
| 118 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 119 | 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] | 120 | { |
| 121 | void *p; |
| 122 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 123 | if (pkt->end + len > pkt->size) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 124 | return -1; |
| 125 | |
| 126 | p = pkt->data + pkt->end; |
| 127 | |
| 128 | pkt->end += len; |
| 129 | memcpy(p, data, len); |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 134 | /* Message reassembly */ |
| 135 | static struct mctp_msg_ctx *mctp_msg_ctx_lookup(struct mctp *mctp, |
| 136 | uint8_t src, uint8_t tag) |
| 137 | { |
| 138 | unsigned int i; |
| 139 | |
| 140 | /* @todo: better lookup, if we add support for more outstanding |
| 141 | * message contexts */ |
| 142 | for (i = 0; i < ARRAY_SIZE(mctp->msg_ctxs); i++) { |
| 143 | struct mctp_msg_ctx *ctx = &mctp->msg_ctxs[i]; |
| 144 | if (ctx->src == src && ctx->tag == tag) |
| 145 | return ctx; |
| 146 | } |
| 147 | |
| 148 | return NULL; |
| 149 | } |
| 150 | |
| 151 | static struct mctp_msg_ctx *mctp_msg_ctx_create(struct mctp *mctp, |
| 152 | uint8_t src, uint8_t tag) |
| 153 | { |
Jeremy Kerr | 11a234e | 2019-02-27 17:59:53 +0800 | [diff] [blame] | 154 | struct mctp_msg_ctx *ctx = NULL; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 155 | unsigned int i; |
| 156 | |
| 157 | for (i = 0; i < ARRAY_SIZE(mctp->msg_ctxs); i++) { |
| 158 | struct mctp_msg_ctx *tmp = &mctp->msg_ctxs[i]; |
| 159 | if (!tmp->src) { |
| 160 | ctx = tmp; |
| 161 | break; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | if (!ctx) |
| 166 | return NULL; |
| 167 | |
| 168 | ctx->src = src; |
| 169 | ctx->tag = tag; |
Jeremy Kerr | 9a3da81 | 2019-08-02 15:57:53 +0800 | [diff] [blame] | 170 | ctx->buf_size = 0; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 171 | |
| 172 | return ctx; |
| 173 | } |
| 174 | |
| 175 | static void mctp_msg_ctx_drop(struct mctp_msg_ctx *ctx) |
| 176 | { |
| 177 | ctx->src = 0; |
| 178 | } |
| 179 | |
| 180 | static void mctp_msg_ctx_reset(struct mctp_msg_ctx *ctx) |
| 181 | { |
| 182 | ctx->buf_size = 0; |
| 183 | } |
| 184 | |
| 185 | static int mctp_msg_ctx_add_pkt(struct mctp_msg_ctx *ctx, |
| 186 | struct mctp_pktbuf *pkt) |
| 187 | { |
| 188 | size_t len; |
| 189 | |
| 190 | len = mctp_pktbuf_size(pkt) - sizeof(struct mctp_hdr); |
| 191 | |
| 192 | if (ctx->buf_size + len > ctx->buf_alloc_size) { |
| 193 | size_t new_alloc_size; |
| 194 | |
| 195 | /* @todo: finer-grained allocation, size limits */ |
| 196 | if (!ctx->buf_alloc_size) { |
| 197 | new_alloc_size = 4096; |
| 198 | } else { |
| 199 | new_alloc_size = ctx->buf_alloc_size * 2; |
| 200 | } |
| 201 | ctx->buf = __mctp_realloc(ctx->buf, new_alloc_size); |
| 202 | ctx->buf_alloc_size = new_alloc_size; |
| 203 | } |
| 204 | |
| 205 | memcpy(ctx->buf + ctx->buf_size, mctp_pktbuf_data(pkt), len); |
| 206 | ctx->buf_size += len; |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | /* Core API functions */ |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 212 | struct mctp *mctp_init(void) |
| 213 | { |
| 214 | struct mctp *mctp; |
| 215 | |
| 216 | mctp = __mctp_alloc(sizeof(*mctp)); |
| 217 | memset(mctp, 0, sizeof(*mctp)); |
| 218 | |
| 219 | return mctp; |
| 220 | } |
| 221 | |
| 222 | int mctp_set_rx_all(struct mctp *mctp, mctp_rx_fn fn, void *data) |
| 223 | { |
| 224 | mctp->message_rx = fn; |
| 225 | mctp->message_rx_data = data; |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | static struct mctp_bus *find_bus_for_eid(struct mctp *mctp, |
| 230 | mctp_eid_t dest __attribute__((unused))) |
| 231 | { |
| 232 | return &mctp->busses[0]; |
| 233 | } |
| 234 | |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 235 | int mctp_register_bus(struct mctp *mctp, |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 236 | struct mctp_binding *binding, |
| 237 | mctp_eid_t eid) |
| 238 | { |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 239 | /* todo: multiple busses */ |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 240 | assert(!mctp->busses[0].binding); |
| 241 | mctp->busses[0].binding = binding; |
| 242 | mctp->busses[0].eid = eid; |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 243 | binding->bus = &mctp->busses[0]; |
Jeremy Kerr | 0a00dca | 2019-03-01 08:01:35 +0800 | [diff] [blame] | 244 | binding->mctp = mctp; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
Jeremy Kerr | 0a00dca | 2019-03-01 08:01:35 +0800 | [diff] [blame] | 248 | void mctp_bus_rx(struct mctp_binding *binding, struct mctp_pktbuf *pkt) |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 249 | { |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 250 | struct mctp_bus *bus = binding->bus; |
Jeremy Kerr | 0a00dca | 2019-03-01 08:01:35 +0800 | [diff] [blame] | 251 | struct mctp *mctp = binding->mctp; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 252 | uint8_t flags, exp_seq, seq, tag; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 253 | struct mctp_msg_ctx *ctx; |
| 254 | struct mctp_hdr *hdr; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 255 | size_t len; |
| 256 | void *p; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 257 | int rc; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 258 | |
Jeremy Kerr | 7520cec | 2019-03-01 07:13:18 +0800 | [diff] [blame] | 259 | assert(bus); |
| 260 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 261 | hdr = mctp_pktbuf_hdr(pkt); |
| 262 | |
| 263 | if (hdr->dest != bus->eid) |
| 264 | /* @todo: non-local packet routing */ |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 265 | goto out; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 266 | |
| 267 | flags = hdr->flags_seq_tag & (MCTP_HDR_FLAG_SOM | MCTP_HDR_FLAG_EOM); |
| 268 | tag = (hdr->flags_seq_tag >> MCTP_HDR_TAG_SHIFT) & MCTP_HDR_TAG_MASK; |
| 269 | seq = (hdr->flags_seq_tag >> MCTP_HDR_SEQ_SHIFT) & MCTP_HDR_SEQ_MASK; |
| 270 | |
| 271 | switch (flags) { |
| 272 | case MCTP_HDR_FLAG_SOM | MCTP_HDR_FLAG_EOM: |
| 273 | /* single-packet message - send straight up to rx function, |
| 274 | * no need to create a message context */ |
| 275 | len = pkt->end - pkt->mctp_hdr_off - sizeof(struct mctp_hdr); |
| 276 | p = pkt->data + pkt->mctp_hdr_off + sizeof(struct mctp_hdr), |
Jeremy Kerr | a8ec706 | 2019-03-06 09:03:54 +0800 | [diff] [blame] | 277 | mctp->message_rx(hdr->src, mctp->message_rx_data, p, len); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 278 | break; |
| 279 | |
| 280 | case MCTP_HDR_FLAG_SOM: |
| 281 | /* start of a new message - start the new context for |
| 282 | * future message reception. If an existing context is |
| 283 | * already present, drop it. */ |
| 284 | ctx = mctp_msg_ctx_lookup(mctp, hdr->src, tag); |
| 285 | if (ctx) { |
| 286 | mctp_msg_ctx_reset(ctx); |
| 287 | } else { |
| 288 | ctx = mctp_msg_ctx_create(mctp, hdr->src, tag); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | rc = mctp_msg_ctx_add_pkt(ctx, pkt); |
| 292 | if (rc) { |
| 293 | mctp_msg_ctx_drop(ctx); |
| 294 | } else { |
| 295 | ctx->last_seq = seq; |
| 296 | } |
| 297 | |
| 298 | break; |
| 299 | |
| 300 | case MCTP_HDR_FLAG_EOM: |
| 301 | ctx = mctp_msg_ctx_lookup(mctp, hdr->src, tag); |
| 302 | if (!ctx) |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 303 | goto out; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 304 | |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 305 | exp_seq = (ctx->last_seq + 1) % 4; |
| 306 | |
| 307 | if (exp_seq != seq) { |
| 308 | mctp_prdebug( |
| 309 | "Sequence number %d does not match expected %d", |
| 310 | seq, exp_seq); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 311 | mctp_msg_ctx_drop(ctx); |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 312 | goto out; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | rc = mctp_msg_ctx_add_pkt(ctx, pkt); |
| 316 | if (!rc) { |
Jeremy Kerr | 4c95118 | 2019-03-20 12:28:23 +0800 | [diff] [blame] | 317 | mctp->message_rx(ctx->src, mctp->message_rx_data, |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 318 | ctx->buf, ctx->buf_size); |
| 319 | } |
| 320 | |
| 321 | mctp_msg_ctx_drop(ctx); |
| 322 | break; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 323 | |
| 324 | case 0: |
| 325 | /* Neither SOM nor EOM */ |
| 326 | ctx = mctp_msg_ctx_lookup(mctp, hdr->src, tag); |
| 327 | if (!ctx) |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 328 | goto out; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 329 | |
| 330 | exp_seq = (ctx->last_seq + 1) % 4; |
| 331 | if (exp_seq != seq) { |
| 332 | mctp_prdebug( |
| 333 | "Sequence number %d does not match expected %d", |
| 334 | seq, exp_seq); |
| 335 | mctp_msg_ctx_drop(ctx); |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 336 | goto out; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | rc = mctp_msg_ctx_add_pkt(ctx, pkt); |
| 340 | if (rc) { |
| 341 | mctp_msg_ctx_drop(ctx); |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 342 | goto out; |
Ed Tanous | c2def9f | 2019-02-21 08:33:08 -0800 | [diff] [blame] | 343 | } |
| 344 | ctx->last_seq = seq; |
| 345 | |
| 346 | break; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 347 | } |
Jeremy Kerr | c1693af | 2019-08-05 14:30:59 +0800 | [diff] [blame] | 348 | out: |
| 349 | mctp_pktbuf_free(pkt); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 350 | } |
| 351 | |
Jeremy Kerr | 0a00dca | 2019-03-01 08:01:35 +0800 | [diff] [blame] | 352 | static int mctp_packet_tx(struct mctp_bus *bus, |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 353 | struct mctp_pktbuf *pkt) |
| 354 | { |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 355 | if (!bus->tx_enabled) |
| 356 | return -1; |
| 357 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 358 | return bus->binding->tx(bus->binding, pkt); |
| 359 | } |
| 360 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 361 | static void mctp_send_tx_queue(struct mctp_bus *bus) |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 362 | { |
| 363 | struct mctp_pktbuf *pkt; |
| 364 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 365 | while ((pkt = bus->tx_queue_head)) { |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 366 | int rc; |
| 367 | |
| 368 | rc = mctp_packet_tx(bus, pkt); |
| 369 | if (rc) |
| 370 | break; |
| 371 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 372 | bus->tx_queue_head = pkt->next; |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 373 | mctp_pktbuf_free(pkt); |
| 374 | } |
| 375 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 376 | if (!bus->tx_queue_head) |
| 377 | bus->tx_queue_tail = NULL; |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 378 | |
| 379 | } |
| 380 | |
| 381 | void mctp_binding_set_tx_enabled(struct mctp_binding *binding, bool enable) |
| 382 | { |
| 383 | struct mctp_bus *bus = binding->bus; |
| 384 | bus->tx_enabled = enable; |
| 385 | if (enable) |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 386 | mctp_send_tx_queue(bus); |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 387 | } |
| 388 | |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 389 | int mctp_message_tx(struct mctp *mctp, mctp_eid_t eid, |
| 390 | void *msg, size_t msg_len) |
| 391 | { |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 392 | size_t max_payload_len, payload_len, p; |
Jeremy Kerr | 1cd3118 | 2019-02-27 18:01:00 +0800 | [diff] [blame] | 393 | struct mctp_pktbuf *pkt; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 394 | struct mctp_hdr *hdr; |
| 395 | struct mctp_bus *bus; |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 396 | int i; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 397 | |
| 398 | bus = find_bus_for_eid(mctp, eid); |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 399 | max_payload_len = bus->binding->pkt_size - sizeof(*hdr); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 400 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 401 | /* queue up packets, each of max MCTP_MTU size */ |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 402 | for (p = 0, i = 0; p < msg_len; i++) { |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 403 | payload_len = msg_len - p; |
| 404 | if (payload_len > max_payload_len) |
| 405 | payload_len = max_payload_len; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 406 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 407 | pkt = mctp_pktbuf_alloc(bus->binding, payload_len + sizeof(*hdr)); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 408 | hdr = mctp_pktbuf_hdr(pkt); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 409 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 410 | /* todo: tags */ |
| 411 | hdr->ver = bus->binding->version & 0xf; |
| 412 | hdr->dest = eid; |
| 413 | hdr->src = bus->eid; |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 414 | hdr->flags_seq_tag = MCTP_HDR_FLAG_TO | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 415 | (0 << MCTP_HDR_TAG_SHIFT); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 416 | |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 417 | if (i == 0) |
| 418 | hdr->flags_seq_tag |= MCTP_HDR_FLAG_SOM; |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 419 | if (p + payload_len >= msg_len) |
Jeremy Kerr | c855d7b | 2019-08-01 21:18:09 +0800 | [diff] [blame] | 420 | hdr->flags_seq_tag |= MCTP_HDR_FLAG_EOM; |
| 421 | hdr->flags_seq_tag |= |
| 422 | (i & MCTP_HDR_SEQ_MASK) << MCTP_HDR_SEQ_SHIFT; |
| 423 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 424 | memcpy(mctp_pktbuf_data(pkt), msg + p, payload_len); |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 425 | |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 426 | /* add to tx queue */ |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 427 | if (bus->tx_queue_tail) |
| 428 | bus->tx_queue_tail->next = pkt; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 429 | else |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 430 | bus->tx_queue_head = pkt; |
| 431 | bus->tx_queue_tail = pkt; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 432 | |
Jeremy Kerr | df15f7e | 2019-08-05 15:41:19 +0800 | [diff] [blame] | 433 | p += payload_len; |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 434 | } |
| 435 | |
Jeremy Kerr | cc2458d | 2019-03-01 08:23:33 +0800 | [diff] [blame] | 436 | mctp_send_tx_queue(bus); |
Jeremy Kerr | 24db71f | 2019-02-07 21:37:35 +0800 | [diff] [blame] | 437 | |
| 438 | return 0; |
Jeremy Kerr | 4cdc200 | 2019-02-07 16:49:12 +0800 | [diff] [blame] | 439 | } |