ceph/src/seastar/dpdk/lib/librte_port/rte_port_fd.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2016 Intel Corporation
   3  */
   4 #include <string.h>
   5 #include <stdint.h>
   6 #include <unistd.h>
   7
   8 #include <rte_mbuf.h>
   9 #include <rte_malloc.h>
  10
  11 #include "rte_port_fd.h"
  12
  13 /*
  14  * Port FD Reader
  15  */
  16 #ifdef RTE_PORT_STATS_COLLECT
  17
  18 #define RTE_PORT_FD_READER_STATS_PKTS_IN_ADD(port, val) \
  19         do { port->stats.n_pkts_in += val; } while (0)
  20 #define RTE_PORT_FD_READER_STATS_PKTS_DROP_ADD(port, val) \
  21         do { port->stats.n_pkts_drop += val; } while (0)
  22
  23 #else
  24
  25 #define RTE_PORT_FD_READER_STATS_PKTS_IN_ADD(port, val)
  26 #define RTE_PORT_FD_READER_STATS_PKTS_DROP_ADD(port, val)
  27
  28 #endif
  29
  30 struct rte_port_fd_reader {
  31         struct rte_port_in_stats stats;
  32         int fd;
  33         uint32_t mtu;
  34         struct rte_mempool *mempool;
  35 };
  36
  37 static void *
  38 rte_port_fd_reader_create(void *params, int socket_id)
  39 {
  40         struct rte_port_fd_reader_params *conf =
  41                         params;
  42         struct rte_port_fd_reader *port;
  43
  44         /* Check input parameters */
  45         if (conf == NULL) {
  46                 RTE_LOG(ERR, PORT, "%s: params is NULL\n", __func__);
  47                 return NULL;
  48         }
  49         if (conf->fd < 0) {
  50                 RTE_LOG(ERR, PORT, "%s: Invalid file descriptor\n", __func__);
  51                 return NULL;
  52         }
  53         if (conf->mtu == 0) {
  54                 RTE_LOG(ERR, PORT, "%s: Invalid MTU\n", __func__);
  55                 return NULL;
  56         }
  57         if (conf->mempool == NULL) {
  58                 RTE_LOG(ERR, PORT, "%s: Invalid mempool\n", __func__);
  59                 return NULL;
  60         }
  61
  62         /* Memory allocation */
  63         port = rte_zmalloc_socket("PORT", sizeof(*port),
  64                         RTE_CACHE_LINE_SIZE, socket_id);
  65         if (port == NULL) {
  66                 RTE_LOG(ERR, PORT, "%s: Failed to allocate port\n", __func__);
  67                 return NULL;
  68         }
  69
  70         /* Initialization */
  71         port->fd = conf->fd;
  72         port->mtu = conf->mtu;
  73         port->mempool = conf->mempool;
  74
  75         return port;
  76 }
  77
  78 static int
  79 rte_port_fd_reader_rx(void *port, struct rte_mbuf **pkts, uint32_t n_pkts)
  80 {
  81         struct rte_port_fd_reader *p = port;
  82         uint32_t i, j;
  83
  84         if (rte_pktmbuf_alloc_bulk(p->mempool, pkts, n_pkts) != 0)
  85                 return 0;
  86
  87         for (i = 0; i < n_pkts; i++) {
  88                 struct rte_mbuf *pkt = pkts[i];
  89                 void *pkt_data = rte_pktmbuf_mtod(pkt, void *);
  90                 ssize_t n_bytes;
  91
  92                 n_bytes = read(p->fd, pkt_data, (size_t) p->mtu);
  93                 if (n_bytes <= 0)
  94                         break;
  95
  96                 pkt->data_len = n_bytes;
  97                 pkt->pkt_len = n_bytes;
  98         }
  99
 100         for (j = i; j < n_pkts; j++)
 101                 rte_pktmbuf_free(pkts[j]);
 102
 103         RTE_PORT_FD_READER_STATS_PKTS_IN_ADD(p, i);
 104
 105         return i;
 106 }
 107
 108 static int
 109 rte_port_fd_reader_free(void *port)
 110 {
 111         if (port == NULL) {
 112                 RTE_LOG(ERR, PORT, "%s: port is NULL\n", __func__);
 113                 return -EINVAL;
 114         }
 115
 116         rte_free(port);
 117
 118         return 0;
 119 }
 120
 121 static int rte_port_fd_reader_stats_read(void *port,
 122                 struct rte_port_in_stats *stats, int clear)
 123 {
 124         struct rte_port_fd_reader *p =
 125                         port;
 126
 127         if (stats != NULL)
 128                 memcpy(stats, &p->stats, sizeof(p->stats));
 129
 130         if (clear)
 131                 memset(&p->stats, 0, sizeof(p->stats));
 132
 133         return 0;
 134 }
 135
 136 /*
 137  * Port FD Writer
 138  */
 139 #ifdef RTE_PORT_STATS_COLLECT
 140
 141 #define RTE_PORT_FD_WRITER_STATS_PKTS_IN_ADD(port, val) \
 142         do { port->stats.n_pkts_in += val; } while (0)
 143 #define RTE_PORT_FD_WRITER_STATS_PKTS_DROP_ADD(port, val) \
 144         do { port->stats.n_pkts_drop += val; } while (0)
 145
 146 #else
 147
 148 #define RTE_PORT_FD_WRITER_STATS_PKTS_IN_ADD(port, val)
 149 #define RTE_PORT_FD_WRITER_STATS_PKTS_DROP_ADD(port, val)
 150
 151 #endif
 152
 153 struct rte_port_fd_writer {
 154         struct rte_port_out_stats stats;
 155
 156         struct rte_mbuf *tx_buf[2 * RTE_PORT_IN_BURST_SIZE_MAX];
 157         uint32_t tx_burst_sz;
 158         uint16_t tx_buf_count;
 159         uint32_t fd;
 160 };
 161
 162 static void *
 163 rte_port_fd_writer_create(void *params, int socket_id)
 164 {
 165         struct rte_port_fd_writer_params *conf =
 166                 params;
 167         struct rte_port_fd_writer *port;
 168
 169         /* Check input parameters */
 170         if ((conf == NULL) ||
 171                 (conf->tx_burst_sz == 0) ||
 172                 (conf->tx_burst_sz > RTE_PORT_IN_BURST_SIZE_MAX) ||
 173                 (!rte_is_power_of_2(conf->tx_burst_sz))) {
 174                 RTE_LOG(ERR, PORT, "%s: Invalid input parameters\n", __func__);
 175                 return NULL;
 176         }
 177
 178         /* Memory allocation */
 179         port = rte_zmalloc_socket("PORT", sizeof(*port),
 180                 RTE_CACHE_LINE_SIZE, socket_id);
 181         if (port == NULL) {
 182                 RTE_LOG(ERR, PORT, "%s: Failed to allocate port\n", __func__);
 183                 return NULL;
 184         }
 185
 186         /* Initialization */
 187         port->fd = conf->fd;
 188         port->tx_burst_sz = conf->tx_burst_sz;
 189         port->tx_buf_count = 0;
 190
 191         return port;
 192 }
 193
 194 static inline void
 195 send_burst(struct rte_port_fd_writer *p)
 196 {
 197         uint32_t i;
 198
 199         for (i = 0; i < p->tx_buf_count; i++) {
 200                 struct rte_mbuf *pkt = p->tx_buf[i];
 201                 void *pkt_data = rte_pktmbuf_mtod(pkt, void*);
 202                 size_t n_bytes = rte_pktmbuf_data_len(pkt);
 203                 ssize_t ret;
 204
 205                 ret = write(p->fd, pkt_data, n_bytes);
 206                 if (ret < 0)
 207                         break;
 208         }
 209
 210         RTE_PORT_FD_WRITER_STATS_PKTS_DROP_ADD(p, p->tx_buf_count - i);
 211
 212         for (i = 0; i < p->tx_buf_count; i++)
 213                 rte_pktmbuf_free(p->tx_buf[i]);
 214
 215         p->tx_buf_count = 0;
 216 }
 217
 218 static int
 219 rte_port_fd_writer_tx(void *port, struct rte_mbuf *pkt)
 220 {
 221         struct rte_port_fd_writer *p =
 222                 port;
 223
 224         p->tx_buf[p->tx_buf_count++] = pkt;
 225         RTE_PORT_FD_WRITER_STATS_PKTS_IN_ADD(p, 1);
 226         if (p->tx_buf_count >= p->tx_burst_sz)
 227                 send_burst(p);
 228
 229         return 0;
 230 }
 231
 232 static int
 233 rte_port_fd_writer_tx_bulk(void *port,
 234         struct rte_mbuf **pkts,
 235         uint64_t pkts_mask)
 236 {
 237         struct rte_port_fd_writer *p =
 238                 port;
 239         uint32_t tx_buf_count = p->tx_buf_count;
 240
 241         if ((pkts_mask & (pkts_mask + 1)) == 0) {
 242                 uint64_t n_pkts = __builtin_popcountll(pkts_mask);
 243                 uint32_t i;
 244
 245                 for (i = 0; i < n_pkts; i++)
 246                         p->tx_buf[tx_buf_count++] = pkts[i];
 247                 RTE_PORT_FD_WRITER_STATS_PKTS_IN_ADD(p, n_pkts);
 248         } else
 249                 for ( ; pkts_mask; ) {
 250                         uint32_t pkt_index = __builtin_ctzll(pkts_mask);
 251                         uint64_t pkt_mask = 1LLU << pkt_index;
 252                         struct rte_mbuf *pkt = pkts[pkt_index];
 253
 254                         p->tx_buf[tx_buf_count++] = pkt;
 255                         RTE_PORT_FD_WRITER_STATS_PKTS_IN_ADD(p, 1);
 256                         pkts_mask &= ~pkt_mask;
 257                 }
 258
 259         p->tx_buf_count = tx_buf_count;
 260         if (tx_buf_count >= p->tx_burst_sz)
 261                 send_burst(p);
 262
 263         return 0;
 264 }
 265
 266 static int
 267 rte_port_fd_writer_flush(void *port)
 268 {
 269         struct rte_port_fd_writer *p =
 270                 port;
 271
 272         if (p->tx_buf_count > 0)
 273                 send_burst(p);
 274
 275         return 0;
 276 }
 277
 278 static int
 279 rte_port_fd_writer_free(void *port)
 280 {
 281         if (port == NULL) {
 282                 RTE_LOG(ERR, PORT, "%s: Port is NULL\n", __func__);
 283                 return -EINVAL;
 284         }
 285
 286         rte_port_fd_writer_flush(port);
 287         rte_free(port);
 288
 289         return 0;
 290 }
 291
 292 static int rte_port_fd_writer_stats_read(void *port,
 293                 struct rte_port_out_stats *stats, int clear)
 294 {
 295         struct rte_port_fd_writer *p =
 296                 port;
 297
 298         if (stats != NULL)
 299                 memcpy(stats, &p->stats, sizeof(p->stats));
 300
 301         if (clear)
 302                 memset(&p->stats, 0, sizeof(p->stats));
 303
 304         return 0;
 305 }
 306
 307 /*
 308  * Port FD Writer Nodrop
 309  */
 310 #ifdef RTE_PORT_STATS_COLLECT
 311
 312 #define RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_IN_ADD(port, val) \
 313         do { port->stats.n_pkts_in += val; } while (0)
 314 #define RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_DROP_ADD(port, val) \
 315         do { port->stats.n_pkts_drop += val; } while (0)
 316
 317 #else
 318
 319 #define RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_IN_ADD(port, val)
 320 #define RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_DROP_ADD(port, val)
 321
 322 #endif
 323
 324 struct rte_port_fd_writer_nodrop {
 325         struct rte_port_out_stats stats;
 326
 327         struct rte_mbuf *tx_buf[2 * RTE_PORT_IN_BURST_SIZE_MAX];
 328         uint32_t tx_burst_sz;
 329         uint16_t tx_buf_count;
 330         uint64_t n_retries;
 331         uint32_t fd;
 332 };
 333
 334 static void *
 335 rte_port_fd_writer_nodrop_create(void *params, int socket_id)
 336 {
 337         struct rte_port_fd_writer_nodrop_params *conf =
 338                         params;
 339         struct rte_port_fd_writer_nodrop *port;
 340
 341         /* Check input parameters */
 342         if ((conf == NULL) ||
 343                 (conf->fd < 0) ||
 344                 (conf->tx_burst_sz == 0) ||
 345                 (conf->tx_burst_sz > RTE_PORT_IN_BURST_SIZE_MAX) ||
 346                 (!rte_is_power_of_2(conf->tx_burst_sz))) {
 347                 RTE_LOG(ERR, PORT, "%s: Invalid input parameters\n", __func__);
 348                 return NULL;
 349         }
 350
 351         /* Memory allocation */
 352         port = rte_zmalloc_socket("PORT", sizeof(*port),
 353                 RTE_CACHE_LINE_SIZE, socket_id);
 354         if (port == NULL) {
 355                 RTE_LOG(ERR, PORT, "%s: Failed to allocate port\n", __func__);
 356                 return NULL;
 357         }
 358
 359         /* Initialization */
 360         port->fd = conf->fd;
 361         port->tx_burst_sz = conf->tx_burst_sz;
 362         port->tx_buf_count = 0;
 363
 364         /*
 365          * When n_retries is 0 it means that we should wait for every packet to
 366          * send no matter how many retries should it take. To limit number of
 367          * branches in fast path, we use UINT64_MAX instead of branching.
 368          */
 369         port->n_retries = (conf->n_retries == 0) ? UINT64_MAX : conf->n_retries;
 370
 371         return port;
 372 }
 373
 374 static inline void
 375 send_burst_nodrop(struct rte_port_fd_writer_nodrop *p)
 376 {
 377         uint64_t n_retries;
 378         uint32_t i;
 379
 380         n_retries = 0;
 381         for (i = 0; (i < p->tx_buf_count) && (n_retries < p->n_retries); i++) {
 382                 struct rte_mbuf *pkt = p->tx_buf[i];
 383                 void *pkt_data = rte_pktmbuf_mtod(pkt, void*);
 384                 size_t n_bytes = rte_pktmbuf_data_len(pkt);
 385
 386                 for ( ; n_retries < p->n_retries; n_retries++) {
 387                         ssize_t ret;
 388
 389                         ret = write(p->fd, pkt_data, n_bytes);
 390                         if (ret)
 391                                 break;
 392                 }
 393         }
 394
 395         RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_DROP_ADD(p, p->tx_buf_count - i);
 396
 397         for (i = 0; i < p->tx_buf_count; i++)
 398                 rte_pktmbuf_free(p->tx_buf[i]);
 399
 400         p->tx_buf_count = 0;
 401 }
 402
 403 static int
 404 rte_port_fd_writer_nodrop_tx(void *port, struct rte_mbuf *pkt)
 405 {
 406         struct rte_port_fd_writer_nodrop *p =
 407                 port;
 408
 409         p->tx_buf[p->tx_buf_count++] = pkt;
 410         RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_IN_ADD(p, 1);
 411         if (p->tx_buf_count >= p->tx_burst_sz)
 412                 send_burst_nodrop(p);
 413
 414         return 0;
 415 }
 416
 417 static int
 418 rte_port_fd_writer_nodrop_tx_bulk(void *port,
 419         struct rte_mbuf **pkts,
 420         uint64_t pkts_mask)
 421 {
 422         struct rte_port_fd_writer_nodrop *p =
 423                 port;
 424         uint32_t tx_buf_count = p->tx_buf_count;
 425
 426         if ((pkts_mask & (pkts_mask + 1)) == 0) {
 427                 uint64_t n_pkts = __builtin_popcountll(pkts_mask);
 428                 uint32_t i;
 429
 430                 for (i = 0; i < n_pkts; i++)
 431                         p->tx_buf[tx_buf_count++] = pkts[i];
 432                 RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_IN_ADD(p, n_pkts);
 433         } else
 434                 for ( ; pkts_mask; ) {
 435                         uint32_t pkt_index = __builtin_ctzll(pkts_mask);
 436                         uint64_t pkt_mask = 1LLU << pkt_index;
 437                         struct rte_mbuf *pkt = pkts[pkt_index];
 438
 439                         p->tx_buf[tx_buf_count++] = pkt;
 440                         RTE_PORT_FD_WRITER_NODROP_STATS_PKTS_IN_ADD(p, 1);
 441                         pkts_mask &= ~pkt_mask;
 442                 }
 443
 444         p->tx_buf_count = tx_buf_count;
 445         if (tx_buf_count >= p->tx_burst_sz)
 446                 send_burst_nodrop(p);
 447
 448         return 0;
 449 }
 450
 451 static int
 452 rte_port_fd_writer_nodrop_flush(void *port)
 453 {
 454         struct rte_port_fd_writer_nodrop *p =
 455                 port;
 456
 457         if (p->tx_buf_count > 0)
 458                 send_burst_nodrop(p);
 459
 460         return 0;
 461 }
 462
 463 static int
 464 rte_port_fd_writer_nodrop_free(void *port)
 465 {
 466         if (port == NULL) {
 467                 RTE_LOG(ERR, PORT, "%s: Port is NULL\n", __func__);
 468                 return -EINVAL;
 469         }
 470
 471         rte_port_fd_writer_nodrop_flush(port);
 472         rte_free(port);
 473
 474 return 0;
 475 }
 476
 477 static int rte_port_fd_writer_nodrop_stats_read(void *port,
 478                 struct rte_port_out_stats *stats, int clear)
 479 {
 480         struct rte_port_fd_writer_nodrop *p =
 481                 port;
 482
 483         if (stats != NULL)
 484                 memcpy(stats, &p->stats, sizeof(p->stats));
 485
 486         if (clear)
 487                 memset(&p->stats, 0, sizeof(p->stats));
 488
 489         return 0;
 490 }
 491
 492 /*
 493  * Summary of port operations
 494  */
 495 struct rte_port_in_ops rte_port_fd_reader_ops = {
 496         .f_create = rte_port_fd_reader_create,
 497         .f_free = rte_port_fd_reader_free,
 498         .f_rx = rte_port_fd_reader_rx,
 499         .f_stats = rte_port_fd_reader_stats_read,
 500 };
 501
 502 struct rte_port_out_ops rte_port_fd_writer_ops = {
 503         .f_create = rte_port_fd_writer_create,
 504         .f_free = rte_port_fd_writer_free,
 505         .f_tx = rte_port_fd_writer_tx,
 506         .f_tx_bulk = rte_port_fd_writer_tx_bulk,
 507         .f_flush = rte_port_fd_writer_flush,
 508         .f_stats = rte_port_fd_writer_stats_read,
 509 };
 510
 511 struct rte_port_out_ops rte_port_fd_writer_nodrop_ops = {
 512         .f_create = rte_port_fd_writer_nodrop_create,
 513         .f_free = rte_port_fd_writer_nodrop_free,
 514         .f_tx = rte_port_fd_writer_nodrop_tx,
 515         .f_tx_bulk = rte_port_fd_writer_nodrop_tx_bulk,
 516         .f_flush = rte_port_fd_writer_nodrop_flush,
 517         .f_stats = rte_port_fd_writer_nodrop_stats_read,
 518 };