lib/sched/rte_sched.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <stdio.h>
   6 #include <string.h>
   7
   8 #include <rte_common.h>
   9 #include <rte_log.h>
  10 #include <rte_malloc.h>
  11 #include <rte_cycles.h>
  12 #include <rte_prefetch.h>
  13 #include <rte_branch_prediction.h>
  14 #include <rte_mbuf.h>
  15 #include <rte_bitmap.h>
  16 #include <rte_reciprocal.h>
  17
  18 #include "rte_sched.h"
  19 #include "rte_sched_common.h"
  20 #include "rte_approx.h"
  21
  22 #ifdef __INTEL_COMPILER
  23 #pragma warning(disable:2259) /* conversion may lose significant bits */
  24 #endif
  25
  26 #ifndef RTE_SCHED_PORT_N_GRINDERS
  27 #define RTE_SCHED_PORT_N_GRINDERS 8
  28 #endif
  29
  30 #define RTE_SCHED_TB_RATE_CONFIG_ERR          (1e-7)
  31 #define RTE_SCHED_WRR_SHIFT                   3
  32 #define RTE_SCHED_MAX_QUEUES_PER_TC           RTE_SCHED_BE_QUEUES_PER_PIPE
  33 #define RTE_SCHED_GRINDER_PCACHE_SIZE         (64 / RTE_SCHED_QUEUES_PER_PIPE)
  34 #define RTE_SCHED_PIPE_INVALID                UINT32_MAX
  35 #define RTE_SCHED_BMP_POS_INVALID             UINT32_MAX
  36
  37 /* Scaling for cycles_per_byte calculation
  38  * Chosen so that minimum rate is 480 bit/sec
  39  */
  40 #define RTE_SCHED_TIME_SHIFT                  8
  41
  42 struct rte_sched_pipe_profile {
  43         /* Token bucket (TB) */
  44         uint64_t tb_period;
  45         uint64_t tb_credits_per_period;
  46         uint64_t tb_size;
  47
  48         /* Pipe traffic classes */
  49         uint64_t tc_period;
  50         uint64_t tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
  51         uint8_t tc_ov_weight;
  52
  53         /* Pipe best-effort traffic class queues */
  54         uint8_t  wrr_cost[RTE_SCHED_BE_QUEUES_PER_PIPE];
  55 };
  56
  57 struct rte_sched_pipe {
  58         /* Token bucket (TB) */
  59         uint64_t tb_time; /* time of last update */
  60         uint64_t tb_credits;
  61
  62         /* Pipe profile and flags */
  63         uint32_t profile;
  64
  65         /* Traffic classes (TCs) */
  66         uint64_t tc_time; /* time of next update */
  67         uint64_t tc_credits[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
  68
  69         /* Weighted Round Robin (WRR) */
  70         uint8_t wrr_tokens[RTE_SCHED_BE_QUEUES_PER_PIPE];
  71
  72         /* TC oversubscription */
  73         uint64_t tc_ov_credits;
  74         uint8_t tc_ov_period_id;
  75 } __rte_cache_aligned;
  76
  77 struct rte_sched_queue {
  78         uint16_t qw;
  79         uint16_t qr;
  80 };
  81
  82 struct rte_sched_queue_extra {
  83         struct rte_sched_queue_stats stats;
  84 #ifdef RTE_SCHED_CMAN
  85         RTE_STD_C11
  86         union {
  87                 struct rte_red red;
  88                 struct rte_pie pie;
  89         };
  90 #endif
  91 };
  92
  93 enum grinder_state {
  94         e_GRINDER_PREFETCH_PIPE = 0,
  95         e_GRINDER_PREFETCH_TC_QUEUE_ARRAYS,
  96         e_GRINDER_PREFETCH_MBUF,
  97         e_GRINDER_READ_MBUF
  98 };
  99
 100 struct rte_sched_subport_profile {
 101         /* Token bucket (TB) */
 102         uint64_t tb_period;
 103         uint64_t tb_credits_per_period;
 104         uint64_t tb_size;
 105
 106         uint64_t tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
 107         uint64_t tc_period;
 108 };
 109
 110 struct rte_sched_grinder {
 111         /* Pipe cache */
 112         uint16_t pcache_qmask[RTE_SCHED_GRINDER_PCACHE_SIZE];
 113         uint32_t pcache_qindex[RTE_SCHED_GRINDER_PCACHE_SIZE];
 114         uint32_t pcache_w;
 115         uint32_t pcache_r;
 116
 117         /* Current pipe */
 118         enum grinder_state state;
 119         uint32_t productive;
 120         uint32_t pindex;
 121         struct rte_sched_subport *subport;
 122         struct rte_sched_subport_profile *subport_params;
 123         struct rte_sched_pipe *pipe;
 124         struct rte_sched_pipe_profile *pipe_params;
 125
 126         /* TC cache */
 127         uint8_t tccache_qmask[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
 128         uint32_t tccache_qindex[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
 129         uint32_t tccache_w;
 130         uint32_t tccache_r;
 131
 132         /* Current TC */
 133         uint32_t tc_index;
 134         struct rte_sched_queue *queue[RTE_SCHED_MAX_QUEUES_PER_TC];
 135         struct rte_mbuf **qbase[RTE_SCHED_MAX_QUEUES_PER_TC];
 136         uint32_t qindex[RTE_SCHED_MAX_QUEUES_PER_TC];
 137         uint16_t qsize;
 138         uint32_t qmask;
 139         uint32_t qpos;
 140         struct rte_mbuf *pkt;
 141
 142         /* WRR */
 143         uint16_t wrr_tokens[RTE_SCHED_BE_QUEUES_PER_PIPE];
 144         uint16_t wrr_mask[RTE_SCHED_BE_QUEUES_PER_PIPE];
 145         uint8_t wrr_cost[RTE_SCHED_BE_QUEUES_PER_PIPE];
 146 };
 147
 148 struct rte_sched_subport {
 149         /* Token bucket (TB) */
 150         uint64_t tb_time; /* time of last update */
 151         uint64_t tb_credits;
 152
 153         /* Traffic classes (TCs) */
 154         uint64_t tc_time; /* time of next update */
 155         uint64_t tc_credits[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
 156
 157         /* TC oversubscription */
 158         uint64_t tc_ov_wm;
 159         uint64_t tc_ov_wm_min;
 160         uint64_t tc_ov_wm_max;
 161         uint8_t tc_ov_period_id;
 162         uint8_t tc_ov;
 163         uint32_t tc_ov_n;
 164         double tc_ov_rate;
 165
 166         /* Statistics */
 167         struct rte_sched_subport_stats stats __rte_cache_aligned;
 168
 169         /* subport profile */
 170         uint32_t profile;
 171         /* Subport pipes */
 172         uint32_t n_pipes_per_subport_enabled;
 173         uint32_t n_pipe_profiles;
 174         uint32_t n_max_pipe_profiles;
 175
 176         /* Pipe best-effort TC rate */
 177         uint64_t pipe_tc_be_rate_max;
 178
 179         /* Pipe queues size */
 180         uint16_t qsize[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
 181
 182 #ifdef RTE_SCHED_CMAN
 183         bool cman_enabled;
 184         enum rte_sched_cman_mode cman;
 185
 186         RTE_STD_C11
 187         union {
 188                 struct rte_red_config red_config[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE][RTE_COLORS];
 189                 struct rte_pie_config pie_config[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
 190         };
 191 #endif
 192
 193         /* Scheduling loop detection */
 194         uint32_t pipe_loop;
 195         uint32_t pipe_exhaustion;
 196
 197         /* Bitmap */
 198         struct rte_bitmap *bmp;
 199         uint32_t grinder_base_bmp_pos[RTE_SCHED_PORT_N_GRINDERS] __rte_aligned_16;
 200
 201         /* Grinders */
 202         struct rte_sched_grinder grinder[RTE_SCHED_PORT_N_GRINDERS];
 203         uint32_t busy_grinders;
 204
 205         /* Queue base calculation */
 206         uint32_t qsize_add[RTE_SCHED_QUEUES_PER_PIPE];
 207         uint32_t qsize_sum;
 208
 209         struct rte_sched_pipe *pipe;
 210         struct rte_sched_queue *queue;
 211         struct rte_sched_queue_extra *queue_extra;
 212         struct rte_sched_pipe_profile *pipe_profiles;
 213         uint8_t *bmp_array;
 214         struct rte_mbuf **queue_array;
 215         uint8_t memory[0] __rte_cache_aligned;
 216 } __rte_cache_aligned;
 217
 218 struct rte_sched_port {
 219         /* User parameters */
 220         uint32_t n_subports_per_port;
 221         uint32_t n_pipes_per_subport;
 222         uint32_t n_pipes_per_subport_log2;
 223         uint16_t pipe_queue[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
 224         uint8_t pipe_tc[RTE_SCHED_QUEUES_PER_PIPE];
 225         uint8_t tc_queue[RTE_SCHED_QUEUES_PER_PIPE];
 226         uint32_t n_subport_profiles;
 227         uint32_t n_max_subport_profiles;
 228         uint64_t rate;
 229         uint32_t mtu;
 230         uint32_t frame_overhead;
 231         int socket;
 232
 233         /* Timing */
 234         uint64_t time_cpu_cycles;     /* Current CPU time measured in CPU cycles */
 235         uint64_t time_cpu_bytes;      /* Current CPU time measured in bytes */
 236         uint64_t time;                /* Current NIC TX time measured in bytes */
 237         struct rte_reciprocal inv_cycles_per_byte; /* CPU cycles per byte */
 238         uint64_t cycles_per_byte;
 239
 240         /* Grinders */
 241         struct rte_mbuf **pkts_out;
 242         uint32_t n_pkts_out;
 243         uint32_t subport_id;
 244
 245         /* Large data structures */
 246         struct rte_sched_subport_profile *subport_profiles;
 247         struct rte_sched_subport *subports[0] __rte_cache_aligned;
 248 } __rte_cache_aligned;
 249
 250 enum rte_sched_subport_array {
 251         e_RTE_SCHED_SUBPORT_ARRAY_PIPE = 0,
 252         e_RTE_SCHED_SUBPORT_ARRAY_QUEUE,
 253         e_RTE_SCHED_SUBPORT_ARRAY_QUEUE_EXTRA,
 254         e_RTE_SCHED_SUBPORT_ARRAY_PIPE_PROFILES,
 255         e_RTE_SCHED_SUBPORT_ARRAY_BMP_ARRAY,
 256         e_RTE_SCHED_SUBPORT_ARRAY_QUEUE_ARRAY,
 257         e_RTE_SCHED_SUBPORT_ARRAY_TOTAL,
 258 };
 259
 260 static inline uint32_t
 261 rte_sched_subport_pipe_queues(struct rte_sched_subport *subport)
 262 {
 263         return RTE_SCHED_QUEUES_PER_PIPE * subport->n_pipes_per_subport_enabled;
 264 }
 265
 266 static inline struct rte_mbuf **
 267 rte_sched_subport_pipe_qbase(struct rte_sched_subport *subport, uint32_t qindex)
 268 {
 269         uint32_t pindex = qindex >> 4;
 270         uint32_t qpos = qindex & (RTE_SCHED_QUEUES_PER_PIPE - 1);
 271
 272         return (subport->queue_array + pindex *
 273                 subport->qsize_sum + subport->qsize_add[qpos]);
 274 }
 275
 276 static inline uint16_t
 277 rte_sched_subport_pipe_qsize(struct rte_sched_port *port,
 278 struct rte_sched_subport *subport, uint32_t qindex)
 279 {
 280         uint32_t tc = port->pipe_tc[qindex & (RTE_SCHED_QUEUES_PER_PIPE - 1)];
 281
 282         return subport->qsize[tc];
 283 }
 284
 285 static inline uint32_t
 286 rte_sched_port_queues_per_port(struct rte_sched_port *port)
 287 {
 288         uint32_t n_queues = 0, i;
 289
 290         for (i = 0; i < port->n_subports_per_port; i++)
 291                 n_queues += rte_sched_subport_pipe_queues(port->subports[i]);
 292
 293         return n_queues;
 294 }
 295
 296 static inline uint16_t
 297 rte_sched_port_pipe_queue(struct rte_sched_port *port, uint32_t traffic_class)
 298 {
 299         uint16_t pipe_queue = port->pipe_queue[traffic_class];
 300
 301         return pipe_queue;
 302 }
 303
 304 static inline uint8_t
 305 rte_sched_port_pipe_tc(struct rte_sched_port *port, uint32_t qindex)
 306 {
 307         uint8_t pipe_tc = port->pipe_tc[qindex & (RTE_SCHED_QUEUES_PER_PIPE - 1)];
 308
 309         return pipe_tc;
 310 }
 311
 312 static inline uint8_t
 313 rte_sched_port_tc_queue(struct rte_sched_port *port, uint32_t qindex)
 314 {
 315         uint8_t tc_queue = port->tc_queue[qindex & (RTE_SCHED_QUEUES_PER_PIPE - 1)];
 316
 317         return tc_queue;
 318 }
 319
 320 static int
 321 pipe_profile_check(struct rte_sched_pipe_params *params,
 322         uint64_t rate, uint16_t *qsize)
 323 {
 324         uint32_t i;
 325
 326         /* Pipe parameters */
 327         if (params == NULL) {
 328                 RTE_LOG(ERR, SCHED,
 329                         "%s: Incorrect value for parameter params\n", __func__);
 330                 return -EINVAL;
 331         }
 332
 333         /* TB rate: non-zero, not greater than port rate */
 334         if (params->tb_rate == 0 ||
 335                 params->tb_rate > rate) {
 336                 RTE_LOG(ERR, SCHED,
 337                         "%s: Incorrect value for tb rate\n", __func__);
 338                 return -EINVAL;
 339         }
 340
 341         /* TB size: non-zero */
 342         if (params->tb_size == 0) {
 343                 RTE_LOG(ERR, SCHED,
 344                         "%s: Incorrect value for tb size\n", __func__);
 345                 return -EINVAL;
 346         }
 347
 348         /* TC rate: non-zero if qsize non-zero, less than pipe rate */
 349         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++) {
 350                 if ((qsize[i] == 0 && params->tc_rate[i] != 0) ||
 351                         (qsize[i] != 0 && (params->tc_rate[i] == 0 ||
 352                         params->tc_rate[i] > params->tb_rate))) {
 353                         RTE_LOG(ERR, SCHED,
 354                                 "%s: Incorrect value for qsize or tc_rate\n", __func__);
 355                         return -EINVAL;
 356                 }
 357         }
 358
 359         if (params->tc_rate[RTE_SCHED_TRAFFIC_CLASS_BE] == 0 ||
 360                 qsize[RTE_SCHED_TRAFFIC_CLASS_BE] == 0) {
 361                 RTE_LOG(ERR, SCHED,
 362                         "%s: Incorrect value for be traffic class rate\n", __func__);
 363                 return -EINVAL;
 364         }
 365
 366         /* TC period: non-zero */
 367         if (params->tc_period == 0) {
 368                 RTE_LOG(ERR, SCHED,
 369                         "%s: Incorrect value for tc period\n", __func__);
 370                 return -EINVAL;
 371         }
 372
 373         /*  Best effort tc oversubscription weight: non-zero */
 374         if (params->tc_ov_weight == 0) {
 375                 RTE_LOG(ERR, SCHED,
 376                         "%s: Incorrect value for tc ov weight\n", __func__);
 377                 return -EINVAL;
 378         }
 379
 380         /* Queue WRR weights: non-zero */
 381         for (i = 0; i < RTE_SCHED_BE_QUEUES_PER_PIPE; i++) {
 382                 if (params->wrr_weights[i] == 0) {
 383                         RTE_LOG(ERR, SCHED,
 384                                 "%s: Incorrect value for wrr weight\n", __func__);
 385                         return -EINVAL;
 386                 }
 387         }
 388
 389         return 0;
 390 }
 391
 392 static int
 393 subport_profile_check(struct rte_sched_subport_profile_params *params,
 394         uint64_t rate)
 395 {
 396         uint32_t i;
 397
 398         /* Check user parameters */
 399         if (params == NULL) {
 400                 RTE_LOG(ERR, SCHED, "%s: "
 401                 "Incorrect value for parameter params\n", __func__);
 402                 return -EINVAL;
 403         }
 404
 405         if (params->tb_rate == 0 || params->tb_rate > rate) {
 406                 RTE_LOG(ERR, SCHED, "%s: "
 407                 "Incorrect value for tb rate\n", __func__);
 408                 return -EINVAL;
 409         }
 410
 411         if (params->tb_size == 0) {
 412                 RTE_LOG(ERR, SCHED, "%s: "
 413                 "Incorrect value for tb size\n", __func__);
 414                 return -EINVAL;
 415         }
 416
 417         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++) {
 418                 uint64_t tc_rate = params->tc_rate[i];
 419
 420                 if (tc_rate == 0 || (tc_rate > params->tb_rate)) {
 421                         RTE_LOG(ERR, SCHED, "%s: "
 422                         "Incorrect value for tc rate\n", __func__);
 423                         return -EINVAL;
 424                 }
 425         }
 426
 427         if (params->tc_rate[RTE_SCHED_TRAFFIC_CLASS_BE] == 0) {
 428                 RTE_LOG(ERR, SCHED, "%s: "
 429                 "Incorrect tc rate(best effort)\n", __func__);
 430                 return -EINVAL;
 431         }
 432
 433         if (params->tc_period == 0) {
 434                 RTE_LOG(ERR, SCHED, "%s: "
 435                 "Incorrect value for tc period\n", __func__);
 436                 return -EINVAL;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int
 443 rte_sched_port_check_params(struct rte_sched_port_params *params)
 444 {
 445         uint32_t i;
 446
 447         if (params == NULL) {
 448                 RTE_LOG(ERR, SCHED,
 449                         "%s: Incorrect value for parameter params\n", __func__);
 450                 return -EINVAL;
 451         }
 452
 453         /* socket */
 454         if (params->socket < 0) {
 455                 RTE_LOG(ERR, SCHED,
 456                         "%s: Incorrect value for socket id\n", __func__);
 457                 return -EINVAL;
 458         }
 459
 460         /* rate */
 461         if (params->rate == 0) {
 462                 RTE_LOG(ERR, SCHED,
 463                         "%s: Incorrect value for rate\n", __func__);
 464                 return -EINVAL;
 465         }
 466
 467         /* mtu */
 468         if (params->mtu == 0) {
 469                 RTE_LOG(ERR, SCHED,
 470                         "%s: Incorrect value for mtu\n", __func__);
 471                 return -EINVAL;
 472         }
 473
 474         /* n_subports_per_port: non-zero, limited to 16 bits, power of 2 */
 475         if (params->n_subports_per_port == 0 ||
 476             params->n_subports_per_port > 1u << 16 ||
 477             !rte_is_power_of_2(params->n_subports_per_port)) {
 478                 RTE_LOG(ERR, SCHED,
 479                         "%s: Incorrect value for number of subports\n", __func__);
 480                 return -EINVAL;
 481         }
 482
 483         if (params->subport_profiles == NULL ||
 484                 params->n_subport_profiles == 0 ||
 485                 params->n_max_subport_profiles == 0 ||
 486                 params->n_subport_profiles > params->n_max_subport_profiles) {
 487                 RTE_LOG(ERR, SCHED,
 488                 "%s: Incorrect value for subport profiles\n", __func__);
 489                 return -EINVAL;
 490         }
 491
 492         for (i = 0; i < params->n_subport_profiles; i++) {
 493                 struct rte_sched_subport_profile_params *p =
 494                                                 params->subport_profiles + i;
 495                 int status;
 496
 497                 status = subport_profile_check(p, params->rate);
 498                 if (status != 0) {
 499                         RTE_LOG(ERR, SCHED,
 500                         "%s: subport profile check failed(%d)\n",
 501                         __func__, status);
 502                         return -EINVAL;
 503                 }
 504         }
 505
 506         /* n_pipes_per_subport: non-zero, power of 2 */
 507         if (params->n_pipes_per_subport == 0 ||
 508             !rte_is_power_of_2(params->n_pipes_per_subport)) {
 509                 RTE_LOG(ERR, SCHED,
 510                         "%s: Incorrect value for maximum pipes number\n", __func__);
 511                 return -EINVAL;
 512         }
 513
 514         return 0;
 515 }
 516
 517 static uint32_t
 518 rte_sched_subport_get_array_base(struct rte_sched_subport_params *params,
 519         enum rte_sched_subport_array array)
 520 {
 521         uint32_t n_pipes_per_subport = params->n_pipes_per_subport_enabled;
 522         uint32_t n_subport_pipe_queues =
 523                 RTE_SCHED_QUEUES_PER_PIPE * n_pipes_per_subport;
 524
 525         uint32_t size_pipe = n_pipes_per_subport * sizeof(struct rte_sched_pipe);
 526         uint32_t size_queue =
 527                 n_subport_pipe_queues * sizeof(struct rte_sched_queue);
 528         uint32_t size_queue_extra
 529                 = n_subport_pipe_queues * sizeof(struct rte_sched_queue_extra);
 530         uint32_t size_pipe_profiles = params->n_max_pipe_profiles *
 531                 sizeof(struct rte_sched_pipe_profile);
 532         uint32_t size_bmp_array =
 533                 rte_bitmap_get_memory_footprint(n_subport_pipe_queues);
 534         uint32_t size_per_pipe_queue_array, size_queue_array;
 535
 536         uint32_t base, i;
 537
 538         size_per_pipe_queue_array = 0;
 539         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++) {
 540                 if (i < RTE_SCHED_TRAFFIC_CLASS_BE)
 541                         size_per_pipe_queue_array +=
 542                                 params->qsize[i] * sizeof(struct rte_mbuf *);
 543                 else
 544                         size_per_pipe_queue_array += RTE_SCHED_MAX_QUEUES_PER_TC *
 545                                 params->qsize[i] * sizeof(struct rte_mbuf *);
 546         }
 547         size_queue_array = n_pipes_per_subport * size_per_pipe_queue_array;
 548
 549         base = 0;
 550
 551         if (array == e_RTE_SCHED_SUBPORT_ARRAY_PIPE)
 552                 return base;
 553         base += RTE_CACHE_LINE_ROUNDUP(size_pipe);
 554
 555         if (array == e_RTE_SCHED_SUBPORT_ARRAY_QUEUE)
 556                 return base;
 557         base += RTE_CACHE_LINE_ROUNDUP(size_queue);
 558
 559         if (array == e_RTE_SCHED_SUBPORT_ARRAY_QUEUE_EXTRA)
 560                 return base;
 561         base += RTE_CACHE_LINE_ROUNDUP(size_queue_extra);
 562
 563         if (array == e_RTE_SCHED_SUBPORT_ARRAY_PIPE_PROFILES)
 564                 return base;
 565         base += RTE_CACHE_LINE_ROUNDUP(size_pipe_profiles);
 566
 567         if (array == e_RTE_SCHED_SUBPORT_ARRAY_BMP_ARRAY)
 568                 return base;
 569         base += RTE_CACHE_LINE_ROUNDUP(size_bmp_array);
 570
 571         if (array == e_RTE_SCHED_SUBPORT_ARRAY_QUEUE_ARRAY)
 572                 return base;
 573         base += RTE_CACHE_LINE_ROUNDUP(size_queue_array);
 574
 575         return base;
 576 }
 577
 578 static void
 579 rte_sched_subport_config_qsize(struct rte_sched_subport *subport)
 580 {
 581         uint32_t i;
 582
 583         subport->qsize_add[0] = 0;
 584
 585         /* Strict priority traffic class */
 586         for (i = 1; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
 587                 subport->qsize_add[i] = subport->qsize_add[i-1] + subport->qsize[i-1];
 588
 589         /* Best-effort traffic class */
 590         subport->qsize_add[RTE_SCHED_TRAFFIC_CLASS_BE + 1] =
 591                 subport->qsize_add[RTE_SCHED_TRAFFIC_CLASS_BE] +
 592                 subport->qsize[RTE_SCHED_TRAFFIC_CLASS_BE];
 593         subport->qsize_add[RTE_SCHED_TRAFFIC_CLASS_BE + 2] =
 594                 subport->qsize_add[RTE_SCHED_TRAFFIC_CLASS_BE + 1] +
 595                 subport->qsize[RTE_SCHED_TRAFFIC_CLASS_BE];
 596         subport->qsize_add[RTE_SCHED_TRAFFIC_CLASS_BE + 3] =
 597                 subport->qsize_add[RTE_SCHED_TRAFFIC_CLASS_BE + 2] +
 598                 subport->qsize[RTE_SCHED_TRAFFIC_CLASS_BE];
 599
 600         subport->qsize_sum = subport->qsize_add[RTE_SCHED_TRAFFIC_CLASS_BE + 3] +
 601                 subport->qsize[RTE_SCHED_TRAFFIC_CLASS_BE];
 602 }
 603
 604 static void
 605 rte_sched_port_log_pipe_profile(struct rte_sched_subport *subport, uint32_t i)
 606 {
 607         struct rte_sched_pipe_profile *p = subport->pipe_profiles + i;
 608
 609         RTE_LOG(DEBUG, SCHED, "Low level config for pipe profile %u:\n"
 610                 "       Token bucket: period = %"PRIu64", credits per period = %"PRIu64", size = %"PRIu64"\n"
 611                 "       Traffic classes: period = %"PRIu64",\n"
 612                 "       credits per period = [%"PRIu64", %"PRIu64", %"PRIu64", %"PRIu64
 613                 ", %"PRIu64", %"PRIu64", %"PRIu64", %"PRIu64", %"PRIu64", %"PRIu64
 614                 ", %"PRIu64", %"PRIu64", %"PRIu64"]\n"
 615                 "       Best-effort traffic class oversubscription: weight = %hhu\n"
 616                 "       WRR cost: [%hhu, %hhu, %hhu, %hhu]\n",
 617                 i,
 618
 619                 /* Token bucket */
 620                 p->tb_period,
 621                 p->tb_credits_per_period,
 622                 p->tb_size,
 623
 624                 /* Traffic classes */
 625                 p->tc_period,
 626                 p->tc_credits_per_period[0],
 627                 p->tc_credits_per_period[1],
 628                 p->tc_credits_per_period[2],
 629                 p->tc_credits_per_period[3],
 630                 p->tc_credits_per_period[4],
 631                 p->tc_credits_per_period[5],
 632                 p->tc_credits_per_period[6],
 633                 p->tc_credits_per_period[7],
 634                 p->tc_credits_per_period[8],
 635                 p->tc_credits_per_period[9],
 636                 p->tc_credits_per_period[10],
 637                 p->tc_credits_per_period[11],
 638                 p->tc_credits_per_period[12],
 639
 640                 /* Best-effort traffic class oversubscription */
 641                 p->tc_ov_weight,
 642
 643                 /* WRR */
 644                 p->wrr_cost[0], p->wrr_cost[1], p->wrr_cost[2], p->wrr_cost[3]);
 645 }
 646
 647 static void
 648 rte_sched_port_log_subport_profile(struct rte_sched_port *port, uint32_t i)
 649 {
 650         struct rte_sched_subport_profile *p = port->subport_profiles + i;
 651
 652         RTE_LOG(DEBUG, SCHED, "Low level config for subport profile %u:\n"
 653         "Token bucket: period = %"PRIu64", credits per period = %"PRIu64","
 654         "size = %"PRIu64"\n"
 655         "Traffic classes: period = %"PRIu64",\n"
 656         "credits per period = [%"PRIu64", %"PRIu64", %"PRIu64", %"PRIu64
 657         " %"PRIu64", %"PRIu64", %"PRIu64", %"PRIu64", %"PRIu64", %"PRIu64
 658         " %"PRIu64", %"PRIu64", %"PRIu64"]\n",
 659         i,
 660
 661         /* Token bucket */
 662         p->tb_period,
 663         p->tb_credits_per_period,
 664         p->tb_size,
 665
 666         /* Traffic classes */
 667         p->tc_period,
 668         p->tc_credits_per_period[0],
 669         p->tc_credits_per_period[1],
 670         p->tc_credits_per_period[2],
 671         p->tc_credits_per_period[3],
 672         p->tc_credits_per_period[4],
 673         p->tc_credits_per_period[5],
 674         p->tc_credits_per_period[6],
 675         p->tc_credits_per_period[7],
 676         p->tc_credits_per_period[8],
 677         p->tc_credits_per_period[9],
 678         p->tc_credits_per_period[10],
 679         p->tc_credits_per_period[11],
 680         p->tc_credits_per_period[12]);
 681 }
 682
 683 static inline uint64_t
 684 rte_sched_time_ms_to_bytes(uint64_t time_ms, uint64_t rate)
 685 {
 686         uint64_t time = time_ms;
 687
 688         time = (time * rate) / 1000;
 689
 690         return time;
 691 }
 692
 693 static void
 694 rte_sched_pipe_profile_convert(struct rte_sched_subport *subport,
 695         struct rte_sched_pipe_params *src,
 696         struct rte_sched_pipe_profile *dst,
 697         uint64_t rate)
 698 {
 699         uint32_t wrr_cost[RTE_SCHED_BE_QUEUES_PER_PIPE];
 700         uint32_t lcd1, lcd2, lcd;
 701         uint32_t i;
 702
 703         /* Token Bucket */
 704         if (src->tb_rate == rate) {
 705                 dst->tb_credits_per_period = 1;
 706                 dst->tb_period = 1;
 707         } else {
 708                 double tb_rate = (double) src->tb_rate
 709                                 / (double) rate;
 710                 double d = RTE_SCHED_TB_RATE_CONFIG_ERR;
 711
 712                 rte_approx_64(tb_rate, d, &dst->tb_credits_per_period,
 713                         &dst->tb_period);
 714         }
 715
 716         dst->tb_size = src->tb_size;
 717
 718         /* Traffic Classes */
 719         dst->tc_period = rte_sched_time_ms_to_bytes(src->tc_period,
 720                                                 rate);
 721
 722         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
 723                 if (subport->qsize[i])
 724                         dst->tc_credits_per_period[i]
 725                                 = rte_sched_time_ms_to_bytes(src->tc_period,
 726                                         src->tc_rate[i]);
 727
 728         dst->tc_ov_weight = src->tc_ov_weight;
 729
 730         /* WRR queues */
 731         wrr_cost[0] = src->wrr_weights[0];
 732         wrr_cost[1] = src->wrr_weights[1];
 733         wrr_cost[2] = src->wrr_weights[2];
 734         wrr_cost[3] = src->wrr_weights[3];
 735
 736         lcd1 = rte_get_lcd(wrr_cost[0], wrr_cost[1]);
 737         lcd2 = rte_get_lcd(wrr_cost[2], wrr_cost[3]);
 738         lcd = rte_get_lcd(lcd1, lcd2);
 739
 740         wrr_cost[0] = lcd / wrr_cost[0];
 741         wrr_cost[1] = lcd / wrr_cost[1];
 742         wrr_cost[2] = lcd / wrr_cost[2];
 743         wrr_cost[3] = lcd / wrr_cost[3];
 744
 745         dst->wrr_cost[0] = (uint8_t) wrr_cost[0];
 746         dst->wrr_cost[1] = (uint8_t) wrr_cost[1];
 747         dst->wrr_cost[2] = (uint8_t) wrr_cost[2];
 748         dst->wrr_cost[3] = (uint8_t) wrr_cost[3];
 749 }
 750
 751 static void
 752 rte_sched_subport_profile_convert(struct rte_sched_subport_profile_params *src,
 753         struct rte_sched_subport_profile *dst,
 754         uint64_t rate)
 755 {
 756         uint32_t i;
 757
 758         /* Token Bucket */
 759         if (src->tb_rate == rate) {
 760                 dst->tb_credits_per_period = 1;
 761                 dst->tb_period = 1;
 762         } else {
 763                 double tb_rate = (double) src->tb_rate
 764                                 / (double) rate;
 765                 double d = RTE_SCHED_TB_RATE_CONFIG_ERR;
 766
 767                 rte_approx_64(tb_rate, d, &dst->tb_credits_per_period,
 768                         &dst->tb_period);
 769         }
 770
 771         dst->tb_size = src->tb_size;
 772
 773         /* Traffic Classes */
 774         dst->tc_period = rte_sched_time_ms_to_bytes(src->tc_period, rate);
 775
 776         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
 777                 dst->tc_credits_per_period[i]
 778                         = rte_sched_time_ms_to_bytes(src->tc_period,
 779                                 src->tc_rate[i]);
 780 }
 781
 782 static void
 783 rte_sched_subport_config_pipe_profile_table(struct rte_sched_subport *subport,
 784         struct rte_sched_subport_params *params, uint64_t rate)
 785 {
 786         uint32_t i;
 787
 788         for (i = 0; i < subport->n_pipe_profiles; i++) {
 789                 struct rte_sched_pipe_params *src = params->pipe_profiles + i;
 790                 struct rte_sched_pipe_profile *dst = subport->pipe_profiles + i;
 791
 792                 rte_sched_pipe_profile_convert(subport, src, dst, rate);
 793                 rte_sched_port_log_pipe_profile(subport, i);
 794         }
 795
 796         subport->pipe_tc_be_rate_max = 0;
 797         for (i = 0; i < subport->n_pipe_profiles; i++) {
 798                 struct rte_sched_pipe_params *src = params->pipe_profiles + i;
 799                 uint64_t pipe_tc_be_rate = src->tc_rate[RTE_SCHED_TRAFFIC_CLASS_BE];
 800
 801                 if (subport->pipe_tc_be_rate_max < pipe_tc_be_rate)
 802                         subport->pipe_tc_be_rate_max = pipe_tc_be_rate;
 803         }
 804 }
 805
 806 static void
 807 rte_sched_port_config_subport_profile_table(struct rte_sched_port *port,
 808         struct rte_sched_port_params *params,
 809         uint64_t rate)
 810 {
 811         uint32_t i;
 812
 813         for (i = 0; i < port->n_subport_profiles; i++) {
 814                 struct rte_sched_subport_profile_params *src
 815                                 = params->subport_profiles + i;
 816                 struct rte_sched_subport_profile *dst
 817                                 = port->subport_profiles + i;
 818
 819                 rte_sched_subport_profile_convert(src, dst, rate);
 820                 rte_sched_port_log_subport_profile(port, i);
 821         }
 822 }
 823
 824 static int
 825 rte_sched_subport_check_params(struct rte_sched_subport_params *params,
 826         uint32_t n_max_pipes_per_subport,
 827         uint64_t rate)
 828 {
 829         uint32_t i;
 830
 831         /* Check user parameters */
 832         if (params == NULL) {
 833                 RTE_LOG(ERR, SCHED,
 834                         "%s: Incorrect value for parameter params\n", __func__);
 835                 return -EINVAL;
 836         }
 837
 838         /* qsize: if non-zero, power of 2,
 839          * no bigger than 32K (due to 16-bit read/write pointers)
 840          */
 841         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++) {
 842                 uint16_t qsize = params->qsize[i];
 843
 844                 if (qsize != 0 && !rte_is_power_of_2(qsize)) {
 845                         RTE_LOG(ERR, SCHED,
 846                                 "%s: Incorrect value for qsize\n", __func__);
 847                         return -EINVAL;
 848                 }
 849         }
 850
 851         if (params->qsize[RTE_SCHED_TRAFFIC_CLASS_BE] == 0) {
 852                 RTE_LOG(ERR, SCHED, "%s: Incorrect qsize\n", __func__);
 853                 return -EINVAL;
 854         }
 855
 856         /* n_pipes_per_subport: non-zero, power of 2 */
 857         if (params->n_pipes_per_subport_enabled == 0 ||
 858                 params->n_pipes_per_subport_enabled > n_max_pipes_per_subport ||
 859             !rte_is_power_of_2(params->n_pipes_per_subport_enabled)) {
 860                 RTE_LOG(ERR, SCHED,
 861                         "%s: Incorrect value for pipes number\n", __func__);
 862                 return -EINVAL;
 863         }
 864
 865         /* pipe_profiles and n_pipe_profiles */
 866         if (params->pipe_profiles == NULL ||
 867             params->n_pipe_profiles == 0 ||
 868                 params->n_max_pipe_profiles == 0 ||
 869                 params->n_pipe_profiles > params->n_max_pipe_profiles) {
 870                 RTE_LOG(ERR, SCHED,
 871                         "%s: Incorrect value for pipe profiles\n", __func__);
 872                 return -EINVAL;
 873         }
 874
 875         for (i = 0; i < params->n_pipe_profiles; i++) {
 876                 struct rte_sched_pipe_params *p = params->pipe_profiles + i;
 877                 int status;
 878
 879                 status = pipe_profile_check(p, rate, &params->qsize[0]);
 880                 if (status != 0) {
 881                         RTE_LOG(ERR, SCHED,
 882                                 "%s: Pipe profile check failed(%d)\n", __func__, status);
 883                         return -EINVAL;
 884                 }
 885         }
 886
 887         return 0;
 888 }
 889
 890 uint32_t
 891 rte_sched_port_get_memory_footprint(struct rte_sched_port_params *port_params,
 892         struct rte_sched_subport_params **subport_params)
 893 {
 894         uint32_t size0 = 0, size1 = 0, i;
 895         int status;
 896
 897         status = rte_sched_port_check_params(port_params);
 898         if (status != 0) {
 899                 RTE_LOG(ERR, SCHED,
 900                         "%s: Port scheduler port params check failed (%d)\n",
 901                         __func__, status);
 902
 903                 return 0;
 904         }
 905
 906         for (i = 0; i < port_params->n_subports_per_port; i++) {
 907                 struct rte_sched_subport_params *sp = subport_params[i];
 908
 909                 status = rte_sched_subport_check_params(sp,
 910                                 port_params->n_pipes_per_subport,
 911                                 port_params->rate);
 912                 if (status != 0) {
 913                         RTE_LOG(ERR, SCHED,
 914                                 "%s: Port scheduler subport params check failed (%d)\n",
 915                                 __func__, status);
 916
 917                         return 0;
 918                 }
 919         }
 920
 921         size0 = sizeof(struct rte_sched_port);
 922
 923         for (i = 0; i < port_params->n_subports_per_port; i++) {
 924                 struct rte_sched_subport_params *sp = subport_params[i];
 925
 926                 size1 += rte_sched_subport_get_array_base(sp,
 927                                         e_RTE_SCHED_SUBPORT_ARRAY_TOTAL);
 928         }
 929
 930         return size0 + size1;
 931 }
 932
 933 struct rte_sched_port *
 934 rte_sched_port_config(struct rte_sched_port_params *params)
 935 {
 936         struct rte_sched_port *port = NULL;
 937         uint32_t size0, size1, size2;
 938         uint32_t cycles_per_byte;
 939         uint32_t i, j;
 940         int status;
 941
 942         status = rte_sched_port_check_params(params);
 943         if (status != 0) {
 944                 RTE_LOG(ERR, SCHED,
 945                         "%s: Port scheduler params check failed (%d)\n",
 946                         __func__, status);
 947                 return NULL;
 948         }
 949
 950         size0 = sizeof(struct rte_sched_port);
 951         size1 = params->n_subports_per_port * sizeof(struct rte_sched_subport *);
 952         size2 = params->n_max_subport_profiles *
 953                 sizeof(struct rte_sched_subport_profile);
 954
 955         /* Allocate memory to store the data structures */
 956         port = rte_zmalloc_socket("qos_params", size0 + size1,
 957                                  RTE_CACHE_LINE_SIZE, params->socket);
 958         if (port == NULL) {
 959                 RTE_LOG(ERR, SCHED, "%s: Memory allocation fails\n", __func__);
 960
 961                 return NULL;
 962         }
 963
 964         /* Allocate memory to store the subport profile */
 965         port->subport_profiles  = rte_zmalloc_socket("subport_profile", size2,
 966                                         RTE_CACHE_LINE_SIZE, params->socket);
 967         if (port->subport_profiles == NULL) {
 968                 RTE_LOG(ERR, SCHED, "%s: Memory allocation fails\n", __func__);
 969                 rte_free(port);
 970                 return NULL;
 971         }
 972
 973         /* User parameters */
 974         port->n_subports_per_port = params->n_subports_per_port;
 975         port->n_subport_profiles = params->n_subport_profiles;
 976         port->n_max_subport_profiles = params->n_max_subport_profiles;
 977         port->n_pipes_per_subport = params->n_pipes_per_subport;
 978         port->n_pipes_per_subport_log2 =
 979                         __builtin_ctz(params->n_pipes_per_subport);
 980         port->socket = params->socket;
 981
 982         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
 983                 port->pipe_queue[i] = i;
 984
 985         for (i = 0, j = 0; i < RTE_SCHED_QUEUES_PER_PIPE; i++) {
 986                 port->pipe_tc[i] = j;
 987
 988                 if (j < RTE_SCHED_TRAFFIC_CLASS_BE)
 989                         j++;
 990         }
 991
 992         for (i = 0, j = 0; i < RTE_SCHED_QUEUES_PER_PIPE; i++) {
 993                 port->tc_queue[i] = j;
 994
 995                 if (i >= RTE_SCHED_TRAFFIC_CLASS_BE)
 996                         j++;
 997         }
 998         port->rate = params->rate;
 999         port->mtu = params->mtu + params->frame_overhead;
1000         port->frame_overhead = params->frame_overhead;
1001
1002         /* Timing */
1003         port->time_cpu_cycles = rte_get_tsc_cycles();
1004         port->time_cpu_bytes = 0;
1005         port->time = 0;
1006
1007         /* Subport profile table */
1008         rte_sched_port_config_subport_profile_table(port, params, port->rate);
1009
1010         cycles_per_byte = (rte_get_tsc_hz() << RTE_SCHED_TIME_SHIFT)
1011                 / params->rate;
1012         port->inv_cycles_per_byte = rte_reciprocal_value(cycles_per_byte);
1013         port->cycles_per_byte = cycles_per_byte;
1014
1015         /* Grinders */
1016         port->pkts_out = NULL;
1017         port->n_pkts_out = 0;
1018         port->subport_id = 0;
1019
1020         return port;
1021 }
1022
1023 static inline void
1024 rte_sched_subport_free(struct rte_sched_port *port,
1025         struct rte_sched_subport *subport)
1026 {
1027         uint32_t n_subport_pipe_queues;
1028         uint32_t qindex;
1029
1030         if (subport == NULL)
1031                 return;
1032
1033         n_subport_pipe_queues = rte_sched_subport_pipe_queues(subport);
1034
1035         /* Free enqueued mbufs */
1036         for (qindex = 0; qindex < n_subport_pipe_queues; qindex++) {
1037                 struct rte_mbuf **mbufs =
1038                         rte_sched_subport_pipe_qbase(subport, qindex);
1039                 uint16_t qsize = rte_sched_subport_pipe_qsize(port, subport, qindex);
1040                 if (qsize != 0) {
1041                         struct rte_sched_queue *queue = subport->queue + qindex;
1042                         uint16_t qr = queue->qr & (qsize - 1);
1043                         uint16_t qw = queue->qw & (qsize - 1);
1044
1045                         for (; qr != qw; qr = (qr + 1) & (qsize - 1))
1046                                 rte_pktmbuf_free(mbufs[qr]);
1047                 }
1048         }
1049
1050         rte_free(subport);
1051 }
1052
1053 void
1054 rte_sched_port_free(struct rte_sched_port *port)
1055 {
1056         uint32_t i;
1057
1058         /* Check user parameters */
1059         if (port == NULL)
1060                 return;
1061
1062         for (i = 0; i < port->n_subports_per_port; i++)
1063                 rte_sched_subport_free(port, port->subports[i]);
1064
1065         rte_free(port->subport_profiles);
1066         rte_free(port);
1067 }
1068
1069 static void
1070 rte_sched_free_memory(struct rte_sched_port *port, uint32_t n_subports)
1071 {
1072         uint32_t i;
1073
1074         for (i = 0; i < n_subports; i++) {
1075                 struct rte_sched_subport *subport = port->subports[i];
1076
1077                 rte_sched_subport_free(port, subport);
1078         }
1079
1080         rte_free(port->subport_profiles);
1081         rte_free(port);
1082 }
1083
1084 #ifdef RTE_SCHED_CMAN
1085 static int
1086 rte_sched_red_config(struct rte_sched_port *port,
1087         struct rte_sched_subport *s,
1088         struct rte_sched_subport_params *params,
1089         uint32_t n_subports)
1090 {
1091         uint32_t i;
1092
1093         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++) {
1094
1095                 uint32_t j;
1096
1097                 for (j = 0; j < RTE_COLORS; j++) {
1098                         /* if min/max are both zero, then RED is disabled */
1099                         if ((params->cman_params->red_params[i][j].min_th |
1100                                  params->cman_params->red_params[i][j].max_th) == 0) {
1101                                 continue;
1102                         }
1103
1104                         if (rte_red_config_init(&s->red_config[i][j],
1105                                 params->cman_params->red_params[i][j].wq_log2,
1106                                 params->cman_params->red_params[i][j].min_th,
1107                                 params->cman_params->red_params[i][j].max_th,
1108                                 params->cman_params->red_params[i][j].maxp_inv) != 0) {
1109                                 rte_sched_free_memory(port, n_subports);
1110
1111                                 RTE_LOG(NOTICE, SCHED,
1112                                 "%s: RED configuration init fails\n", __func__);
1113                                 return -EINVAL;
1114                         }
1115                 }
1116         }
1117         s->cman = RTE_SCHED_CMAN_RED;
1118         return 0;
1119 }
1120
1121 static int
1122 rte_sched_pie_config(struct rte_sched_port *port,
1123         struct rte_sched_subport *s,
1124         struct rte_sched_subport_params *params,
1125         uint32_t n_subports)
1126 {
1127         uint32_t i;
1128
1129         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++) {
1130                 if (params->cman_params->pie_params[i].tailq_th > params->qsize[i]) {
1131                         RTE_LOG(NOTICE, SCHED,
1132                         "%s: PIE tailq threshold incorrect\n", __func__);
1133                         return -EINVAL;
1134                 }
1135
1136                 if (rte_pie_config_init(&s->pie_config[i],
1137                         params->cman_params->pie_params[i].qdelay_ref,
1138                         params->cman_params->pie_params[i].dp_update_interval,
1139                         params->cman_params->pie_params[i].max_burst,
1140                         params->cman_params->pie_params[i].tailq_th) != 0) {
1141                         rte_sched_free_memory(port, n_subports);
1142
1143                         RTE_LOG(NOTICE, SCHED,
1144                         "%s: PIE configuration init fails\n", __func__);
1145                         return -EINVAL;
1146                         }
1147         }
1148         s->cman = RTE_SCHED_CMAN_PIE;
1149         return 0;
1150 }
1151
1152 static int
1153 rte_sched_cman_config(struct rte_sched_port *port,
1154         struct rte_sched_subport *s,
1155         struct rte_sched_subport_params *params,
1156         uint32_t n_subports)
1157 {
1158         if (params->cman_params->cman_mode == RTE_SCHED_CMAN_RED)
1159                 return rte_sched_red_config(port, s, params, n_subports);
1160
1161         else if (params->cman_params->cman_mode == RTE_SCHED_CMAN_PIE)
1162                 return rte_sched_pie_config(port, s, params, n_subports);
1163
1164         return -EINVAL;
1165 }
1166 #endif
1167
1168 int
1169 rte_sched_subport_config(struct rte_sched_port *port,
1170         uint32_t subport_id,
1171         struct rte_sched_subport_params *params,
1172         uint32_t subport_profile_id)
1173 {
1174         struct rte_sched_subport *s = NULL;
1175         uint32_t n_subports = subport_id;
1176         struct rte_sched_subport_profile *profile;
1177         uint32_t n_subport_pipe_queues, i;
1178         uint32_t size0, size1, bmp_mem_size;
1179         int status;
1180         int ret;
1181
1182         /* Check user parameters */
1183         if (port == NULL) {
1184                 RTE_LOG(ERR, SCHED,
1185                         "%s: Incorrect value for parameter port\n", __func__);
1186                 return 0;
1187         }
1188
1189         if (subport_id >= port->n_subports_per_port) {
1190                 RTE_LOG(ERR, SCHED,
1191                         "%s: Incorrect value for subport id\n", __func__);
1192                 ret = -EINVAL;
1193                 goto out;
1194         }
1195
1196         if (subport_profile_id >= port->n_max_subport_profiles) {
1197                 RTE_LOG(ERR, SCHED, "%s: "
1198                         "Number of subport profile exceeds the max limit\n",
1199                         __func__);
1200                 ret = -EINVAL;
1201                 goto out;
1202         }
1203
1204         /** Memory is allocated only on first invocation of the api for a
1205          * given subport. Subsequent invocation on same subport will just
1206          * update subport bandwidth parameter.
1207          **/
1208         if (port->subports[subport_id] == NULL) {
1209
1210                 status = rte_sched_subport_check_params(params,
1211                         port->n_pipes_per_subport,
1212                         port->rate);
1213                 if (status != 0) {
1214                         RTE_LOG(NOTICE, SCHED,
1215                                 "%s: Port scheduler params check failed (%d)\n",
1216                                 __func__, status);
1217                         ret = -EINVAL;
1218                         goto out;
1219                 }
1220
1221                 /* Determine the amount of memory to allocate */
1222                 size0 = sizeof(struct rte_sched_subport);
1223                 size1 = rte_sched_subport_get_array_base(params,
1224                                         e_RTE_SCHED_SUBPORT_ARRAY_TOTAL);
1225
1226                 /* Allocate memory to store the data structures */
1227                 s = rte_zmalloc_socket("subport_params", size0 + size1,
1228                         RTE_CACHE_LINE_SIZE, port->socket);
1229                 if (s == NULL) {
1230                         RTE_LOG(ERR, SCHED,
1231                                 "%s: Memory allocation fails\n", __func__);
1232                         ret = -ENOMEM;
1233                         goto out;
1234                 }
1235
1236                 n_subports++;
1237
1238                 subport_profile_id = 0;
1239
1240                 /* Port */
1241                 port->subports[subport_id] = s;
1242
1243                 s->tb_time = port->time;
1244
1245                 /* compile time checks */
1246                 RTE_BUILD_BUG_ON(RTE_SCHED_PORT_N_GRINDERS == 0);
1247                 RTE_BUILD_BUG_ON(RTE_SCHED_PORT_N_GRINDERS &
1248                         (RTE_SCHED_PORT_N_GRINDERS - 1));
1249
1250                 /* User parameters */
1251                 s->n_pipes_per_subport_enabled =
1252                                 params->n_pipes_per_subport_enabled;
1253                 memcpy(s->qsize, params->qsize, sizeof(params->qsize));
1254                 s->n_pipe_profiles = params->n_pipe_profiles;
1255                 s->n_max_pipe_profiles = params->n_max_pipe_profiles;
1256
1257 #ifdef RTE_SCHED_CMAN
1258                 if (params->cman_params != NULL) {
1259                         s->cman_enabled = true;
1260                         status = rte_sched_cman_config(port, s, params, n_subports);
1261                         if (status) {
1262                                 RTE_LOG(NOTICE, SCHED,
1263                                         "%s: CMAN configuration fails\n", __func__);
1264                                 return status;
1265                         }
1266                 } else {
1267                         s->cman_enabled = false;
1268                 }
1269 #endif
1270
1271                 /* Scheduling loop detection */
1272                 s->pipe_loop = RTE_SCHED_PIPE_INVALID;
1273                 s->pipe_exhaustion = 0;
1274
1275                 /* Grinders */
1276                 s->busy_grinders = 0;
1277
1278                 /* Queue base calculation */
1279                 rte_sched_subport_config_qsize(s);
1280
1281                 /* Large data structures */
1282                 s->pipe = (struct rte_sched_pipe *)
1283                         (s->memory + rte_sched_subport_get_array_base(params,
1284                         e_RTE_SCHED_SUBPORT_ARRAY_PIPE));
1285                 s->queue = (struct rte_sched_queue *)
1286                         (s->memory + rte_sched_subport_get_array_base(params,
1287                         e_RTE_SCHED_SUBPORT_ARRAY_QUEUE));
1288                 s->queue_extra = (struct rte_sched_queue_extra *)
1289                         (s->memory + rte_sched_subport_get_array_base(params,
1290                         e_RTE_SCHED_SUBPORT_ARRAY_QUEUE_EXTRA));
1291                 s->pipe_profiles = (struct rte_sched_pipe_profile *)
1292                         (s->memory + rte_sched_subport_get_array_base(params,
1293                         e_RTE_SCHED_SUBPORT_ARRAY_PIPE_PROFILES));
1294                 s->bmp_array =  s->memory + rte_sched_subport_get_array_base(
1295                                 params, e_RTE_SCHED_SUBPORT_ARRAY_BMP_ARRAY);
1296                 s->queue_array = (struct rte_mbuf **)
1297                         (s->memory + rte_sched_subport_get_array_base(params,
1298                         e_RTE_SCHED_SUBPORT_ARRAY_QUEUE_ARRAY));
1299
1300                 /* Pipe profile table */
1301                 rte_sched_subport_config_pipe_profile_table(s, params,
1302                                                             port->rate);
1303
1304                 /* Bitmap */
1305                 n_subport_pipe_queues = rte_sched_subport_pipe_queues(s);
1306                 bmp_mem_size = rte_bitmap_get_memory_footprint(
1307                                                 n_subport_pipe_queues);
1308                 s->bmp = rte_bitmap_init(n_subport_pipe_queues, s->bmp_array,
1309                                         bmp_mem_size);
1310                 if (s->bmp == NULL) {
1311                         RTE_LOG(ERR, SCHED,
1312                                 "%s: Subport bitmap init error\n", __func__);
1313                         ret = -EINVAL;
1314                         goto out;
1315                 }
1316
1317                 for (i = 0; i < RTE_SCHED_PORT_N_GRINDERS; i++)
1318                         s->grinder_base_bmp_pos[i] = RTE_SCHED_PIPE_INVALID;
1319
1320                 /* TC oversubscription */
1321                 s->tc_ov_wm_min = port->mtu;
1322                 s->tc_ov_period_id = 0;
1323                 s->tc_ov = 0;
1324                 s->tc_ov_n = 0;
1325                 s->tc_ov_rate = 0;
1326         }
1327
1328         {
1329         /* update subport parameters from subport profile table*/
1330                 profile = port->subport_profiles + subport_profile_id;
1331
1332                 s = port->subports[subport_id];
1333
1334                 s->tb_credits = profile->tb_size / 2;
1335
1336                 s->tc_time = port->time + profile->tc_period;
1337
1338                 for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
1339                         if (s->qsize[i])
1340                                 s->tc_credits[i] =
1341                                         profile->tc_credits_per_period[i];
1342                         else
1343                                 profile->tc_credits_per_period[i] = 0;
1344
1345                 s->tc_ov_wm_max = rte_sched_time_ms_to_bytes(profile->tc_period,
1346                                                         s->pipe_tc_be_rate_max);
1347                 s->tc_ov_wm = s->tc_ov_wm_max;
1348                 s->profile = subport_profile_id;
1349
1350         }
1351
1352         rte_sched_port_log_subport_profile(port, subport_profile_id);
1353
1354         return 0;
1355
1356 out:
1357         rte_sched_free_memory(port, n_subports);
1358
1359         return ret;
1360 }
1361
1362 int
1363 rte_sched_pipe_config(struct rte_sched_port *port,
1364         uint32_t subport_id,
1365         uint32_t pipe_id,
1366         int32_t pipe_profile)
1367 {
1368         struct rte_sched_subport *s;
1369         struct rte_sched_subport_profile *sp;
1370         struct rte_sched_pipe *p;
1371         struct rte_sched_pipe_profile *params;
1372         uint32_t n_subports = subport_id + 1;
1373         uint32_t deactivate, profile, i;
1374         int ret;
1375
1376         /* Check user parameters */
1377         profile = (uint32_t) pipe_profile;
1378         deactivate = (pipe_profile < 0);
1379
1380         if (port == NULL) {
1381                 RTE_LOG(ERR, SCHED,
1382                         "%s: Incorrect value for parameter port\n", __func__);
1383                 return -EINVAL;
1384         }
1385
1386         if (subport_id >= port->n_subports_per_port) {
1387                 RTE_LOG(ERR, SCHED,
1388                         "%s: Incorrect value for parameter subport id\n", __func__);
1389                 ret = -EINVAL;
1390                 goto out;
1391         }
1392
1393         s = port->subports[subport_id];
1394         if (pipe_id >= s->n_pipes_per_subport_enabled) {
1395                 RTE_LOG(ERR, SCHED,
1396                         "%s: Incorrect value for parameter pipe id\n", __func__);
1397                 ret = -EINVAL;
1398                 goto out;
1399         }
1400
1401         if (!deactivate && profile >= s->n_pipe_profiles) {
1402                 RTE_LOG(ERR, SCHED,
1403                         "%s: Incorrect value for parameter pipe profile\n", __func__);
1404                 ret = -EINVAL;
1405                 goto out;
1406         }
1407
1408         sp = port->subport_profiles + s->profile;
1409         /* Handle the case when pipe already has a valid configuration */
1410         p = s->pipe + pipe_id;
1411         if (p->tb_time) {
1412                 params = s->pipe_profiles + p->profile;
1413
1414                 double subport_tc_be_rate =
1415                 (double)sp->tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASS_BE]
1416                         / (double) sp->tc_period;
1417                 double pipe_tc_be_rate =
1418                         (double) params->tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASS_BE]
1419                         / (double) params->tc_period;
1420                 uint32_t tc_be_ov = s->tc_ov;
1421
1422                 /* Unplug pipe from its subport */
1423                 s->tc_ov_n -= params->tc_ov_weight;
1424                 s->tc_ov_rate -= pipe_tc_be_rate;
1425                 s->tc_ov = s->tc_ov_rate > subport_tc_be_rate;
1426
1427                 if (s->tc_ov != tc_be_ov) {
1428                         RTE_LOG(DEBUG, SCHED,
1429                                 "Subport %u Best-effort TC oversubscription is OFF (%.4lf >= %.4lf)\n",
1430                                 subport_id, subport_tc_be_rate, s->tc_ov_rate);
1431                 }
1432
1433                 /* Reset the pipe */
1434                 memset(p, 0, sizeof(struct rte_sched_pipe));
1435         }
1436
1437         if (deactivate)
1438                 return 0;
1439
1440         /* Apply the new pipe configuration */
1441         p->profile = profile;
1442         params = s->pipe_profiles + p->profile;
1443
1444         /* Token Bucket (TB) */
1445         p->tb_time = port->time;
1446         p->tb_credits = params->tb_size / 2;
1447
1448         /* Traffic Classes (TCs) */
1449         p->tc_time = port->time + params->tc_period;
1450
1451         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
1452                 if (s->qsize[i])
1453                         p->tc_credits[i] = params->tc_credits_per_period[i];
1454
1455         {
1456                 /* Subport best effort tc oversubscription */
1457                 double subport_tc_be_rate =
1458                 (double)sp->tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASS_BE]
1459                         / (double) sp->tc_period;
1460                 double pipe_tc_be_rate =
1461                         (double) params->tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASS_BE]
1462                         / (double) params->tc_period;
1463                 uint32_t tc_be_ov = s->tc_ov;
1464
1465                 s->tc_ov_n += params->tc_ov_weight;
1466                 s->tc_ov_rate += pipe_tc_be_rate;
1467                 s->tc_ov = s->tc_ov_rate > subport_tc_be_rate;
1468
1469                 if (s->tc_ov != tc_be_ov) {
1470                         RTE_LOG(DEBUG, SCHED,
1471                                 "Subport %u Best effort TC oversubscription is ON (%.4lf < %.4lf)\n",
1472                                 subport_id, subport_tc_be_rate, s->tc_ov_rate);
1473                 }
1474                 p->tc_ov_period_id = s->tc_ov_period_id;
1475                 p->tc_ov_credits = s->tc_ov_wm;
1476         }
1477
1478         return 0;
1479
1480 out:
1481         rte_sched_free_memory(port, n_subports);
1482
1483         return ret;
1484 }
1485
1486 int
1487 rte_sched_subport_pipe_profile_add(struct rte_sched_port *port,
1488         uint32_t subport_id,
1489         struct rte_sched_pipe_params *params,
1490         uint32_t *pipe_profile_id)
1491 {
1492         struct rte_sched_subport *s;
1493         struct rte_sched_pipe_profile *pp;
1494         uint32_t i;
1495         int status;
1496
1497         /* Port */
1498         if (port == NULL) {
1499                 RTE_LOG(ERR, SCHED,
1500                         "%s: Incorrect value for parameter port\n", __func__);
1501                 return -EINVAL;
1502         }
1503
1504         /* Subport id not exceeds the max limit */
1505         if (subport_id > port->n_subports_per_port) {
1506                 RTE_LOG(ERR, SCHED,
1507                         "%s: Incorrect value for subport id\n", __func__);
1508                 return -EINVAL;
1509         }
1510
1511         s = port->subports[subport_id];
1512
1513         /* Pipe profiles exceeds the max limit */
1514         if (s->n_pipe_profiles >= s->n_max_pipe_profiles) {
1515                 RTE_LOG(ERR, SCHED,
1516                         "%s: Number of pipe profiles exceeds the max limit\n", __func__);
1517                 return -EINVAL;
1518         }
1519
1520         /* Pipe params */
1521         status = pipe_profile_check(params, port->rate, &s->qsize[0]);
1522         if (status != 0) {
1523                 RTE_LOG(ERR, SCHED,
1524                         "%s: Pipe profile check failed(%d)\n", __func__, status);
1525                 return -EINVAL;
1526         }
1527
1528         pp = &s->pipe_profiles[s->n_pipe_profiles];
1529         rte_sched_pipe_profile_convert(s, params, pp, port->rate);
1530
1531         /* Pipe profile should not exists */
1532         for (i = 0; i < s->n_pipe_profiles; i++)
1533                 if (memcmp(s->pipe_profiles + i, pp, sizeof(*pp)) == 0) {
1534                         RTE_LOG(ERR, SCHED,
1535                                 "%s: Pipe profile exists\n", __func__);
1536                         return -EINVAL;
1537                 }
1538
1539         /* Pipe profile commit */
1540         *pipe_profile_id = s->n_pipe_profiles;
1541         s->n_pipe_profiles++;
1542
1543         if (s->pipe_tc_be_rate_max < params->tc_rate[RTE_SCHED_TRAFFIC_CLASS_BE])
1544                 s->pipe_tc_be_rate_max = params->tc_rate[RTE_SCHED_TRAFFIC_CLASS_BE];
1545
1546         rte_sched_port_log_pipe_profile(s, *pipe_profile_id);
1547
1548         return 0;
1549 }
1550
1551 int
1552 rte_sched_port_subport_profile_add(struct rte_sched_port *port,
1553         struct rte_sched_subport_profile_params *params,
1554         uint32_t *subport_profile_id)
1555 {
1556         int status;
1557         uint32_t i;
1558         struct rte_sched_subport_profile *dst;
1559
1560         /* Port */
1561         if (port == NULL) {
1562                 RTE_LOG(ERR, SCHED, "%s: "
1563                 "Incorrect value for parameter port\n", __func__);
1564                 return -EINVAL;
1565         }
1566
1567         if (params == NULL) {
1568                 RTE_LOG(ERR, SCHED, "%s: "
1569                 "Incorrect value for parameter profile\n", __func__);
1570                 return -EINVAL;
1571         }
1572
1573         if (subport_profile_id == NULL) {
1574                 RTE_LOG(ERR, SCHED, "%s: "
1575                 "Incorrect value for parameter subport_profile_id\n",
1576                 __func__);
1577                 return -EINVAL;
1578         }
1579
1580         dst = port->subport_profiles + port->n_subport_profiles;
1581
1582         /* Subport profiles exceeds the max limit */
1583         if (port->n_subport_profiles >= port->n_max_subport_profiles) {
1584                 RTE_LOG(ERR, SCHED, "%s: "
1585                 "Number of subport profiles exceeds the max limit\n",
1586                  __func__);
1587                 return -EINVAL;
1588         }
1589
1590         status = subport_profile_check(params, port->rate);
1591         if (status != 0) {
1592                 RTE_LOG(ERR, SCHED,
1593                 "%s: subport profile check failed(%d)\n", __func__, status);
1594                 return -EINVAL;
1595         }
1596
1597         rte_sched_subport_profile_convert(params, dst, port->rate);
1598
1599         /* Subport profile should not exists */
1600         for (i = 0; i < port->n_subport_profiles; i++)
1601                 if (memcmp(port->subport_profiles + i,
1602                     dst, sizeof(*dst)) == 0) {
1603                         RTE_LOG(ERR, SCHED,
1604                         "%s: subport profile exists\n", __func__);
1605                         return -EINVAL;
1606                 }
1607
1608         /* Subport profile commit */
1609         *subport_profile_id = port->n_subport_profiles;
1610         port->n_subport_profiles++;
1611
1612         rte_sched_port_log_subport_profile(port, *subport_profile_id);
1613
1614         return 0;
1615 }
1616
1617 static inline uint32_t
1618 rte_sched_port_qindex(struct rte_sched_port *port,
1619         uint32_t subport,
1620         uint32_t pipe,
1621         uint32_t traffic_class,
1622         uint32_t queue)
1623 {
1624         return ((subport & (port->n_subports_per_port - 1)) <<
1625                 (port->n_pipes_per_subport_log2 + 4)) |
1626                 ((pipe &
1627                 (port->subports[subport]->n_pipes_per_subport_enabled - 1)) << 4) |
1628                 ((rte_sched_port_pipe_queue(port, traffic_class) + queue) &
1629                 (RTE_SCHED_QUEUES_PER_PIPE - 1));
1630 }
1631
1632 void
1633 rte_sched_port_pkt_write(struct rte_sched_port *port,
1634                          struct rte_mbuf *pkt,
1635                          uint32_t subport, uint32_t pipe,
1636                          uint32_t traffic_class,
1637                          uint32_t queue, enum rte_color color)
1638 {
1639         uint32_t queue_id =
1640                 rte_sched_port_qindex(port, subport, pipe, traffic_class, queue);
1641
1642         rte_mbuf_sched_set(pkt, queue_id, traffic_class, (uint8_t)color);
1643 }
1644
1645 void
1646 rte_sched_port_pkt_read_tree_path(struct rte_sched_port *port,
1647                                   const struct rte_mbuf *pkt,
1648                                   uint32_t *subport, uint32_t *pipe,
1649                                   uint32_t *traffic_class, uint32_t *queue)
1650 {
1651         uint32_t queue_id = rte_mbuf_sched_queue_get(pkt);
1652
1653         *subport = queue_id >> (port->n_pipes_per_subport_log2 + 4);
1654         *pipe = (queue_id >> 4) &
1655                 (port->subports[*subport]->n_pipes_per_subport_enabled - 1);
1656         *traffic_class = rte_sched_port_pipe_tc(port, queue_id);
1657         *queue = rte_sched_port_tc_queue(port, queue_id);
1658 }
1659
1660 enum rte_color
1661 rte_sched_port_pkt_read_color(const struct rte_mbuf *pkt)
1662 {
1663         return (enum rte_color)rte_mbuf_sched_color_get(pkt);
1664 }
1665
1666 int
1667 rte_sched_subport_read_stats(struct rte_sched_port *port,
1668                              uint32_t subport_id,
1669                              struct rte_sched_subport_stats *stats,
1670                              uint32_t *tc_ov)
1671 {
1672         struct rte_sched_subport *s;
1673
1674         /* Check user parameters */
1675         if (port == NULL) {
1676                 RTE_LOG(ERR, SCHED,
1677                         "%s: Incorrect value for parameter port\n", __func__);
1678                 return -EINVAL;
1679         }
1680
1681         if (subport_id >= port->n_subports_per_port) {
1682                 RTE_LOG(ERR, SCHED,
1683                         "%s: Incorrect value for subport id\n", __func__);
1684                 return -EINVAL;
1685         }
1686
1687         if (stats == NULL) {
1688                 RTE_LOG(ERR, SCHED,
1689                         "%s: Incorrect value for parameter stats\n", __func__);
1690                 return -EINVAL;
1691         }
1692
1693         if (tc_ov == NULL) {
1694                 RTE_LOG(ERR, SCHED,
1695                         "%s: Incorrect value for tc_ov\n", __func__);
1696                 return -EINVAL;
1697         }
1698
1699         s = port->subports[subport_id];
1700
1701         /* Copy subport stats and clear */
1702         memcpy(stats, &s->stats, sizeof(struct rte_sched_subport_stats));
1703         memset(&s->stats, 0, sizeof(struct rte_sched_subport_stats));
1704
1705         /* Subport TC oversubscription status */
1706         *tc_ov = s->tc_ov;
1707
1708         return 0;
1709 }
1710
1711 int
1712 rte_sched_queue_read_stats(struct rte_sched_port *port,
1713         uint32_t queue_id,
1714         struct rte_sched_queue_stats *stats,
1715         uint16_t *qlen)
1716 {
1717         struct rte_sched_subport *s;
1718         struct rte_sched_queue *q;
1719         struct rte_sched_queue_extra *qe;
1720         uint32_t subport_id, subport_qmask, subport_qindex;
1721
1722         /* Check user parameters */
1723         if (port == NULL) {
1724                 RTE_LOG(ERR, SCHED,
1725                         "%s: Incorrect value for parameter port\n", __func__);
1726                 return -EINVAL;
1727         }
1728
1729         if (queue_id >= rte_sched_port_queues_per_port(port)) {
1730                 RTE_LOG(ERR, SCHED,
1731                         "%s: Incorrect value for queue id\n", __func__);
1732                 return -EINVAL;
1733         }
1734
1735         if (stats == NULL) {
1736                 RTE_LOG(ERR, SCHED,
1737                         "%s: Incorrect value for parameter stats\n", __func__);
1738                 return -EINVAL;
1739         }
1740
1741         if (qlen == NULL) {
1742                 RTE_LOG(ERR, SCHED,
1743                         "%s: Incorrect value for parameter qlen\n", __func__);
1744                 return -EINVAL;
1745         }
1746         subport_qmask = port->n_pipes_per_subport_log2 + 4;
1747         subport_id = (queue_id >> subport_qmask) & (port->n_subports_per_port - 1);
1748
1749         s = port->subports[subport_id];
1750         subport_qindex = ((1 << subport_qmask) - 1) & queue_id;
1751         q = s->queue + subport_qindex;
1752         qe = s->queue_extra + subport_qindex;
1753
1754         /* Copy queue stats and clear */
1755         memcpy(stats, &qe->stats, sizeof(struct rte_sched_queue_stats));
1756         memset(&qe->stats, 0, sizeof(struct rte_sched_queue_stats));
1757
1758         /* Queue length */
1759         *qlen = q->qw - q->qr;
1760
1761         return 0;
1762 }
1763
1764 #ifdef RTE_SCHED_DEBUG
1765
1766 static inline int
1767 rte_sched_port_queue_is_empty(struct rte_sched_subport *subport,
1768         uint32_t qindex)
1769 {
1770         struct rte_sched_queue *queue = subport->queue + qindex;
1771
1772         return queue->qr == queue->qw;
1773 }
1774
1775 #endif /* RTE_SCHED_DEBUG */
1776
1777 static inline void
1778 rte_sched_port_update_subport_stats(struct rte_sched_port *port,
1779         struct rte_sched_subport *subport,
1780         uint32_t qindex,
1781         struct rte_mbuf *pkt)
1782 {
1783         uint32_t tc_index = rte_sched_port_pipe_tc(port, qindex);
1784         uint32_t pkt_len = pkt->pkt_len;
1785
1786         subport->stats.n_pkts_tc[tc_index] += 1;
1787         subport->stats.n_bytes_tc[tc_index] += pkt_len;
1788 }
1789
1790 static inline void
1791 rte_sched_port_update_subport_stats_on_drop(struct rte_sched_port *port,
1792         struct rte_sched_subport *subport,
1793         uint32_t qindex,
1794         struct rte_mbuf *pkt,
1795         __rte_unused uint32_t n_pkts_cman_dropped)
1796 {
1797         uint32_t tc_index = rte_sched_port_pipe_tc(port, qindex);
1798         uint32_t pkt_len = pkt->pkt_len;
1799
1800         subport->stats.n_pkts_tc_dropped[tc_index] += 1;
1801         subport->stats.n_bytes_tc_dropped[tc_index] += pkt_len;
1802         subport->stats.n_pkts_cman_dropped[tc_index] += n_pkts_cman_dropped;
1803 }
1804
1805 static inline void
1806 rte_sched_port_update_queue_stats(struct rte_sched_subport *subport,
1807         uint32_t qindex,
1808         struct rte_mbuf *pkt)
1809 {
1810         struct rte_sched_queue_extra *qe = subport->queue_extra + qindex;
1811         uint32_t pkt_len = pkt->pkt_len;
1812
1813         qe->stats.n_pkts += 1;
1814         qe->stats.n_bytes += pkt_len;
1815 }
1816
1817 static inline void
1818 rte_sched_port_update_queue_stats_on_drop(struct rte_sched_subport *subport,
1819         uint32_t qindex,
1820         struct rte_mbuf *pkt,
1821         __rte_unused uint32_t n_pkts_cman_dropped)
1822 {
1823         struct rte_sched_queue_extra *qe = subport->queue_extra + qindex;
1824         uint32_t pkt_len = pkt->pkt_len;
1825
1826         qe->stats.n_pkts_dropped += 1;
1827         qe->stats.n_bytes_dropped += pkt_len;
1828 #ifdef RTE_SCHED_CMAN
1829         if (subport->cman_enabled)
1830                 qe->stats.n_pkts_cman_dropped += n_pkts_cman_dropped;
1831 #endif
1832 }
1833
1834 #ifdef RTE_SCHED_CMAN
1835
1836 static inline int
1837 rte_sched_port_cman_drop(struct rte_sched_port *port,
1838         struct rte_sched_subport *subport,
1839         struct rte_mbuf *pkt,
1840         uint32_t qindex,
1841         uint16_t qlen)
1842 {
1843         if (!subport->cman_enabled)
1844                 return 0;
1845
1846         struct rte_sched_queue_extra *qe;
1847         uint32_t tc_index;
1848
1849         tc_index = rte_sched_port_pipe_tc(port, qindex);
1850         qe = subport->queue_extra + qindex;
1851
1852         /* RED */
1853         if (subport->cman == RTE_SCHED_CMAN_RED) {
1854                 struct rte_red_config *red_cfg;
1855                 struct rte_red *red;
1856                 enum rte_color color;
1857
1858                 color = rte_sched_port_pkt_read_color(pkt);
1859                 red_cfg = &subport->red_config[tc_index][color];
1860
1861                 if ((red_cfg->min_th | red_cfg->max_th) == 0)
1862                         return 0;
1863
1864                 red = &qe->red;
1865
1866                 return rte_red_enqueue(red_cfg, red, qlen, port->time);
1867         }
1868
1869         /* PIE */
1870         struct rte_pie_config *pie_cfg = &subport->pie_config[tc_index];
1871         struct rte_pie *pie = &qe->pie;
1872
1873         return rte_pie_enqueue(pie_cfg, pie, qlen, pkt->pkt_len, port->time_cpu_cycles);
1874 }
1875
1876 static inline void
1877 rte_sched_port_red_set_queue_empty_timestamp(struct rte_sched_port *port,
1878         struct rte_sched_subport *subport, uint32_t qindex)
1879 {
1880         if (subport->cman_enabled) {
1881                 struct rte_sched_queue_extra *qe = subport->queue_extra + qindex;
1882                 if (subport->cman == RTE_SCHED_CMAN_RED) {
1883                         struct rte_red *red = &qe->red;
1884
1885                         rte_red_mark_queue_empty(red, port->time);
1886                 }
1887         }
1888 }
1889
1890 static inline void
1891 rte_sched_port_pie_dequeue(struct rte_sched_subport *subport,
1892 uint32_t qindex, uint32_t pkt_len, uint64_t time) {
1893         if (subport->cman_enabled && subport->cman == RTE_SCHED_CMAN_PIE) {
1894                 struct rte_sched_queue_extra *qe = subport->queue_extra + qindex;
1895                 struct rte_pie *pie = &qe->pie;
1896
1897                 /* Update queue length */
1898                 pie->qlen -= 1;
1899                 pie->qlen_bytes -= pkt_len;
1900
1901                 rte_pie_dequeue(pie, pkt_len, time);
1902         }
1903 }
1904
1905 #else
1906
1907 static inline int rte_sched_port_cman_drop(struct rte_sched_port *port __rte_unused,
1908         struct rte_sched_subport *subport __rte_unused,
1909         struct rte_mbuf *pkt __rte_unused,
1910         uint32_t qindex __rte_unused,
1911         uint16_t qlen __rte_unused)
1912 {
1913         return 0;
1914 }
1915
1916 #define rte_sched_port_red_set_queue_empty_timestamp(port, subport, qindex)
1917
1918 static inline void
1919 rte_sched_port_pie_dequeue(struct rte_sched_subport *subport __rte_unused,
1920         uint32_t qindex __rte_unused,
1921         uint32_t pkt_len __rte_unused,
1922         uint64_t time __rte_unused) {
1923         /* do-nothing when RTE_SCHED_CMAN not defined */
1924 }
1925
1926 #endif /* RTE_SCHED_CMAN */
1927
1928 #ifdef RTE_SCHED_DEBUG
1929
1930 static inline void
1931 debug_check_queue_slab(struct rte_sched_subport *subport, uint32_t bmp_pos,
1932                        uint64_t bmp_slab)
1933 {
1934         uint64_t mask;
1935         uint32_t i, panic;
1936
1937         if (bmp_slab == 0)
1938                 rte_panic("Empty slab at position %u\n", bmp_pos);
1939
1940         panic = 0;
1941         for (i = 0, mask = 1; i < 64; i++, mask <<= 1) {
1942                 if (mask & bmp_slab) {
1943                         if (rte_sched_port_queue_is_empty(subport, bmp_pos + i)) {
1944                                 printf("Queue %u (slab offset %u) is empty\n", bmp_pos + i, i);
1945                                 panic = 1;
1946                         }
1947                 }
1948         }
1949
1950         if (panic)
1951                 rte_panic("Empty queues in slab 0x%" PRIx64 "starting at position %u\n",
1952                         bmp_slab, bmp_pos);
1953 }
1954
1955 #endif /* RTE_SCHED_DEBUG */
1956
1957 static inline struct rte_sched_subport *
1958 rte_sched_port_subport(struct rte_sched_port *port,
1959         struct rte_mbuf *pkt)
1960 {
1961         uint32_t queue_id = rte_mbuf_sched_queue_get(pkt);
1962         uint32_t subport_id = queue_id >> (port->n_pipes_per_subport_log2 + 4);
1963
1964         return port->subports[subport_id];
1965 }
1966
1967 static inline uint32_t
1968 rte_sched_port_enqueue_qptrs_prefetch0(struct rte_sched_subport *subport,
1969         struct rte_mbuf *pkt, uint32_t subport_qmask)
1970 {
1971         struct rte_sched_queue *q;
1972         struct rte_sched_queue_extra *qe;
1973         uint32_t qindex = rte_mbuf_sched_queue_get(pkt);
1974         uint32_t subport_queue_id = subport_qmask & qindex;
1975
1976         q = subport->queue + subport_queue_id;
1977         rte_prefetch0(q);
1978         qe = subport->queue_extra + subport_queue_id;
1979         rte_prefetch0(qe);
1980
1981         return subport_queue_id;
1982 }
1983
1984 static inline void
1985 rte_sched_port_enqueue_qwa_prefetch0(struct rte_sched_port *port,
1986         struct rte_sched_subport *subport,
1987         uint32_t qindex,
1988         struct rte_mbuf **qbase)
1989 {
1990         struct rte_sched_queue *q;
1991         struct rte_mbuf **q_qw;
1992         uint16_t qsize;
1993
1994         q = subport->queue + qindex;
1995         qsize = rte_sched_subport_pipe_qsize(port, subport, qindex);
1996         q_qw = qbase + (q->qw & (qsize - 1));
1997
1998         rte_prefetch0(q_qw);
1999         rte_bitmap_prefetch0(subport->bmp, qindex);
2000 }
2001
2002 static inline int
2003 rte_sched_port_enqueue_qwa(struct rte_sched_port *port,
2004         struct rte_sched_subport *subport,
2005         uint32_t qindex,
2006         struct rte_mbuf **qbase,
2007         struct rte_mbuf *pkt)
2008 {
2009         struct rte_sched_queue *q;
2010         uint16_t qsize;
2011         uint16_t qlen;
2012
2013         q = subport->queue + qindex;
2014         qsize = rte_sched_subport_pipe_qsize(port, subport, qindex);
2015         qlen = q->qw - q->qr;
2016
2017         /* Drop the packet (and update drop stats) when queue is full */
2018         if (unlikely(rte_sched_port_cman_drop(port, subport, pkt, qindex, qlen) ||
2019                      (qlen >= qsize))) {
2020                 rte_pktmbuf_free(pkt);
2021                 rte_sched_port_update_subport_stats_on_drop(port, subport,
2022                         qindex, pkt, qlen < qsize);
2023                 rte_sched_port_update_queue_stats_on_drop(subport, qindex, pkt,
2024                         qlen < qsize);
2025                 return 0;
2026         }
2027
2028         /* Enqueue packet */
2029         qbase[q->qw & (qsize - 1)] = pkt;
2030         q->qw++;
2031
2032         /* Activate queue in the subport bitmap */
2033         rte_bitmap_set(subport->bmp, qindex);
2034
2035         /* Statistics */
2036         rte_sched_port_update_subport_stats(port, subport, qindex, pkt);
2037         rte_sched_port_update_queue_stats(subport, qindex, pkt);
2038
2039         return 1;
2040 }
2041
2042
2043 /*
2044  * The enqueue function implements a 4-level pipeline with each stage
2045  * processing two different packets. The purpose of using a pipeline
2046  * is to hide the latency of prefetching the data structures. The
2047  * naming convention is presented in the diagram below:
2048  *
2049  *   p00  _______   p10  _______   p20  _______   p30  _______
2050  * ----->|       |----->|       |----->|       |----->|       |----->
2051  *       |   0   |      |   1   |      |   2   |      |   3   |
2052  * ----->|_______|----->|_______|----->|_______|----->|_______|----->
2053  *   p01            p11            p21            p31
2054  *
2055  */
2056 int
2057 rte_sched_port_enqueue(struct rte_sched_port *port, struct rte_mbuf **pkts,
2058                        uint32_t n_pkts)
2059 {
2060         struct rte_mbuf *pkt00, *pkt01, *pkt10, *pkt11, *pkt20, *pkt21,
2061                 *pkt30, *pkt31, *pkt_last;
2062         struct rte_mbuf **q00_base, **q01_base, **q10_base, **q11_base,
2063                 **q20_base, **q21_base, **q30_base, **q31_base, **q_last_base;
2064         struct rte_sched_subport *subport00, *subport01, *subport10, *subport11,
2065                 *subport20, *subport21, *subport30, *subport31, *subport_last;
2066         uint32_t q00, q01, q10, q11, q20, q21, q30, q31, q_last;
2067         uint32_t r00, r01, r10, r11, r20, r21, r30, r31, r_last;
2068         uint32_t subport_qmask;
2069         uint32_t result, i;
2070
2071         result = 0;
2072         subport_qmask = (1 << (port->n_pipes_per_subport_log2 + 4)) - 1;
2073
2074         /*
2075          * Less then 6 input packets available, which is not enough to
2076          * feed the pipeline
2077          */
2078         if (unlikely(n_pkts < 6)) {
2079                 struct rte_sched_subport *subports[5];
2080                 struct rte_mbuf **q_base[5];
2081                 uint32_t q[5];
2082
2083                 /* Prefetch the mbuf structure of each packet */
2084                 for (i = 0; i < n_pkts; i++)
2085                         rte_prefetch0(pkts[i]);
2086
2087                 /* Prefetch the subport structure for each packet */
2088                 for (i = 0; i < n_pkts; i++)
2089                         subports[i] = rte_sched_port_subport(port, pkts[i]);
2090
2091                 /* Prefetch the queue structure for each queue */
2092                 for (i = 0; i < n_pkts; i++)
2093                         q[i] = rte_sched_port_enqueue_qptrs_prefetch0(subports[i],
2094                                         pkts[i], subport_qmask);
2095
2096                 /* Prefetch the write pointer location of each queue */
2097                 for (i = 0; i < n_pkts; i++) {
2098                         q_base[i] = rte_sched_subport_pipe_qbase(subports[i], q[i]);
2099                         rte_sched_port_enqueue_qwa_prefetch0(port, subports[i],
2100                                 q[i], q_base[i]);
2101                 }
2102
2103                 /* Write each packet to its queue */
2104                 for (i = 0; i < n_pkts; i++)
2105                         result += rte_sched_port_enqueue_qwa(port, subports[i],
2106                                                 q[i], q_base[i], pkts[i]);
2107
2108                 return result;
2109         }
2110
2111         /* Feed the first 3 stages of the pipeline (6 packets needed) */
2112         pkt20 = pkts[0];
2113         pkt21 = pkts[1];
2114         rte_prefetch0(pkt20);
2115         rte_prefetch0(pkt21);
2116
2117         pkt10 = pkts[2];
2118         pkt11 = pkts[3];
2119         rte_prefetch0(pkt10);
2120         rte_prefetch0(pkt11);
2121
2122         subport20 = rte_sched_port_subport(port, pkt20);
2123         subport21 = rte_sched_port_subport(port, pkt21);
2124         q20 = rte_sched_port_enqueue_qptrs_prefetch0(subport20,
2125                         pkt20, subport_qmask);
2126         q21 = rte_sched_port_enqueue_qptrs_prefetch0(subport21,
2127                         pkt21, subport_qmask);
2128
2129         pkt00 = pkts[4];
2130         pkt01 = pkts[5];
2131         rte_prefetch0(pkt00);
2132         rte_prefetch0(pkt01);
2133
2134         subport10 = rte_sched_port_subport(port, pkt10);
2135         subport11 = rte_sched_port_subport(port, pkt11);
2136         q10 = rte_sched_port_enqueue_qptrs_prefetch0(subport10,
2137                         pkt10, subport_qmask);
2138         q11 = rte_sched_port_enqueue_qptrs_prefetch0(subport11,
2139                         pkt11, subport_qmask);
2140
2141         q20_base = rte_sched_subport_pipe_qbase(subport20, q20);
2142         q21_base = rte_sched_subport_pipe_qbase(subport21, q21);
2143         rte_sched_port_enqueue_qwa_prefetch0(port, subport20, q20, q20_base);
2144         rte_sched_port_enqueue_qwa_prefetch0(port, subport21, q21, q21_base);
2145
2146         /* Run the pipeline */
2147         for (i = 6; i < (n_pkts & (~1)); i += 2) {
2148                 /* Propagate stage inputs */
2149                 pkt30 = pkt20;
2150                 pkt31 = pkt21;
2151                 pkt20 = pkt10;
2152                 pkt21 = pkt11;
2153                 pkt10 = pkt00;
2154                 pkt11 = pkt01;
2155                 q30 = q20;
2156                 q31 = q21;
2157                 q20 = q10;
2158                 q21 = q11;
2159                 subport30 = subport20;
2160                 subport31 = subport21;
2161                 subport20 = subport10;
2162                 subport21 = subport11;
2163                 q30_base = q20_base;
2164                 q31_base = q21_base;
2165
2166                 /* Stage 0: Get packets in */
2167                 pkt00 = pkts[i];
2168                 pkt01 = pkts[i + 1];
2169                 rte_prefetch0(pkt00);
2170                 rte_prefetch0(pkt01);
2171
2172                 /* Stage 1: Prefetch subport and queue structure storing queue pointers */
2173                 subport10 = rte_sched_port_subport(port, pkt10);
2174                 subport11 = rte_sched_port_subport(port, pkt11);
2175                 q10 = rte_sched_port_enqueue_qptrs_prefetch0(subport10,
2176                                 pkt10, subport_qmask);
2177                 q11 = rte_sched_port_enqueue_qptrs_prefetch0(subport11,
2178                                 pkt11, subport_qmask);
2179
2180                 /* Stage 2: Prefetch queue write location */
2181                 q20_base = rte_sched_subport_pipe_qbase(subport20, q20);
2182                 q21_base = rte_sched_subport_pipe_qbase(subport21, q21);
2183                 rte_sched_port_enqueue_qwa_prefetch0(port, subport20, q20, q20_base);
2184                 rte_sched_port_enqueue_qwa_prefetch0(port, subport21, q21, q21_base);
2185
2186                 /* Stage 3: Write packet to queue and activate queue */
2187                 r30 = rte_sched_port_enqueue_qwa(port, subport30,
2188                                 q30, q30_base, pkt30);
2189                 r31 = rte_sched_port_enqueue_qwa(port, subport31,
2190                                 q31, q31_base, pkt31);
2191                 result += r30 + r31;
2192         }
2193
2194         /*
2195          * Drain the pipeline (exactly 6 packets).
2196          * Handle the last packet in the case
2197          * of an odd number of input packets.
2198          */
2199         pkt_last = pkts[n_pkts - 1];
2200         rte_prefetch0(pkt_last);
2201
2202         subport00 = rte_sched_port_subport(port, pkt00);
2203         subport01 = rte_sched_port_subport(port, pkt01);
2204         q00 = rte_sched_port_enqueue_qptrs_prefetch0(subport00,
2205                         pkt00, subport_qmask);
2206         q01 = rte_sched_port_enqueue_qptrs_prefetch0(subport01,
2207                         pkt01, subport_qmask);
2208
2209         q10_base = rte_sched_subport_pipe_qbase(subport10, q10);
2210         q11_base = rte_sched_subport_pipe_qbase(subport11, q11);
2211         rte_sched_port_enqueue_qwa_prefetch0(port, subport10, q10, q10_base);
2212         rte_sched_port_enqueue_qwa_prefetch0(port, subport11, q11, q11_base);
2213
2214         r20 = rte_sched_port_enqueue_qwa(port, subport20,
2215                         q20, q20_base, pkt20);
2216         r21 = rte_sched_port_enqueue_qwa(port, subport21,
2217                         q21, q21_base, pkt21);
2218         result += r20 + r21;
2219
2220         subport_last = rte_sched_port_subport(port, pkt_last);
2221         q_last = rte_sched_port_enqueue_qptrs_prefetch0(subport_last,
2222                                 pkt_last, subport_qmask);
2223
2224         q00_base = rte_sched_subport_pipe_qbase(subport00, q00);
2225         q01_base = rte_sched_subport_pipe_qbase(subport01, q01);
2226         rte_sched_port_enqueue_qwa_prefetch0(port, subport00, q00, q00_base);
2227         rte_sched_port_enqueue_qwa_prefetch0(port, subport01, q01, q01_base);
2228
2229         r10 = rte_sched_port_enqueue_qwa(port, subport10, q10,
2230                         q10_base, pkt10);
2231         r11 = rte_sched_port_enqueue_qwa(port, subport11, q11,
2232                         q11_base, pkt11);
2233         result += r10 + r11;
2234
2235         q_last_base = rte_sched_subport_pipe_qbase(subport_last, q_last);
2236         rte_sched_port_enqueue_qwa_prefetch0(port, subport_last,
2237                 q_last, q_last_base);
2238
2239         r00 = rte_sched_port_enqueue_qwa(port, subport00, q00,
2240                         q00_base, pkt00);
2241         r01 = rte_sched_port_enqueue_qwa(port, subport01, q01,
2242                         q01_base, pkt01);
2243         result += r00 + r01;
2244
2245         if (n_pkts & 1) {
2246                 r_last = rte_sched_port_enqueue_qwa(port, subport_last,
2247                                         q_last, q_last_base, pkt_last);
2248                 result += r_last;
2249         }
2250
2251         return result;
2252 }
2253
2254 static inline uint64_t
2255 grinder_tc_ov_credits_update(struct rte_sched_port *port,
2256         struct rte_sched_subport *subport, uint32_t pos)
2257 {
2258         struct rte_sched_grinder *grinder = subport->grinder + pos;
2259         struct rte_sched_subport_profile *sp = grinder->subport_params;
2260         uint64_t tc_ov_consumption[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
2261         uint64_t tc_consumption = 0, tc_ov_consumption_max;
2262         uint64_t tc_ov_wm = subport->tc_ov_wm;
2263         uint32_t i;
2264
2265         if (subport->tc_ov == 0)
2266                 return subport->tc_ov_wm_max;
2267
2268         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASS_BE; i++) {
2269                 tc_ov_consumption[i] = sp->tc_credits_per_period[i]
2270                                         -  subport->tc_credits[i];
2271                 tc_consumption += tc_ov_consumption[i];
2272         }
2273
2274         tc_ov_consumption[RTE_SCHED_TRAFFIC_CLASS_BE] =
2275         sp->tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASS_BE] -
2276                 subport->tc_credits[RTE_SCHED_TRAFFIC_CLASS_BE];
2277
2278         tc_ov_consumption_max =
2279         sp->tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASS_BE] -
2280                         tc_consumption;
2281
2282         if (tc_ov_consumption[RTE_SCHED_TRAFFIC_CLASS_BE] >
2283                 (tc_ov_consumption_max - port->mtu)) {
2284                 tc_ov_wm  -= tc_ov_wm >> 7;
2285                 if (tc_ov_wm < subport->tc_ov_wm_min)
2286                         tc_ov_wm = subport->tc_ov_wm_min;
2287
2288                 return tc_ov_wm;
2289         }
2290
2291         tc_ov_wm += (tc_ov_wm >> 7) + 1;
2292         if (tc_ov_wm > subport->tc_ov_wm_max)
2293                 tc_ov_wm = subport->tc_ov_wm_max;
2294
2295         return tc_ov_wm;
2296 }
2297
2298 static inline void
2299 grinder_credits_update(struct rte_sched_port *port,
2300         struct rte_sched_subport *subport, uint32_t pos)
2301 {
2302         struct rte_sched_grinder *grinder = subport->grinder + pos;
2303         struct rte_sched_pipe *pipe = grinder->pipe;
2304         struct rte_sched_pipe_profile *params = grinder->pipe_params;
2305         struct rte_sched_subport_profile *sp = grinder->subport_params;
2306         uint64_t n_periods;
2307         uint32_t i;
2308
2309         /* Subport TB */
2310         n_periods = (port->time - subport->tb_time) / sp->tb_period;
2311         subport->tb_credits += n_periods * sp->tb_credits_per_period;
2312         subport->tb_credits = RTE_MIN(subport->tb_credits, sp->tb_size);
2313         subport->tb_time += n_periods * sp->tb_period;
2314
2315         /* Pipe TB */
2316         n_periods = (port->time - pipe->tb_time) / params->tb_period;
2317         pipe->tb_credits += n_periods * params->tb_credits_per_period;
2318         pipe->tb_credits = RTE_MIN(pipe->tb_credits, params->tb_size);
2319         pipe->tb_time += n_periods * params->tb_period;
2320
2321         /* Subport TCs */
2322         if (unlikely(port->time >= subport->tc_time)) {
2323                 subport->tc_ov_wm =
2324                         grinder_tc_ov_credits_update(port, subport, pos);
2325
2326                 for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
2327                         subport->tc_credits[i] = sp->tc_credits_per_period[i];
2328
2329                 subport->tc_time = port->time + sp->tc_period;
2330                 subport->tc_ov_period_id++;
2331         }
2332
2333         /* Pipe TCs */
2334         if (unlikely(port->time >= pipe->tc_time)) {
2335                 for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
2336                         pipe->tc_credits[i] = params->tc_credits_per_period[i];
2337                 pipe->tc_time = port->time + params->tc_period;
2338         }
2339
2340         /* Pipe TCs - Oversubscription */
2341         if (unlikely(pipe->tc_ov_period_id != subport->tc_ov_period_id)) {
2342                 pipe->tc_ov_credits = subport->tc_ov_wm * params->tc_ov_weight;
2343
2344                 pipe->tc_ov_period_id = subport->tc_ov_period_id;
2345         }
2346 }
2347
2348 static inline int
2349 grinder_credits_check(struct rte_sched_port *port,
2350         struct rte_sched_subport *subport, uint32_t pos)
2351 {
2352         struct rte_sched_grinder *grinder = subport->grinder + pos;
2353         struct rte_sched_pipe *pipe = grinder->pipe;
2354         struct rte_mbuf *pkt = grinder->pkt;
2355         uint32_t tc_index = grinder->tc_index;
2356         uint64_t pkt_len = pkt->pkt_len + port->frame_overhead;
2357         uint64_t subport_tb_credits = subport->tb_credits;
2358         uint64_t subport_tc_credits = subport->tc_credits[tc_index];
2359         uint64_t pipe_tb_credits = pipe->tb_credits;
2360         uint64_t pipe_tc_credits = pipe->tc_credits[tc_index];
2361         uint64_t pipe_tc_ov_mask1[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
2362         uint64_t pipe_tc_ov_mask2[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE] = {0};
2363         uint64_t pipe_tc_ov_credits;
2364         uint32_t i;
2365         int enough_credits;
2366
2367         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE; i++)
2368                 pipe_tc_ov_mask1[i] = ~0LLU;
2369
2370         pipe_tc_ov_mask1[RTE_SCHED_TRAFFIC_CLASS_BE] = pipe->tc_ov_credits;
2371         pipe_tc_ov_mask2[RTE_SCHED_TRAFFIC_CLASS_BE] = ~0LLU;
2372         pipe_tc_ov_credits = pipe_tc_ov_mask1[tc_index];
2373
2374         /* Check pipe and subport credits */
2375         enough_credits = (pkt_len <= subport_tb_credits) &&
2376                 (pkt_len <= subport_tc_credits) &&
2377                 (pkt_len <= pipe_tb_credits) &&
2378                 (pkt_len <= pipe_tc_credits) &&
2379                 (pkt_len <= pipe_tc_ov_credits);
2380
2381         if (!enough_credits)
2382                 return 0;
2383
2384         /* Update pipe and subport credits */
2385         subport->tb_credits -= pkt_len;
2386         subport->tc_credits[tc_index] -= pkt_len;
2387         pipe->tb_credits -= pkt_len;
2388         pipe->tc_credits[tc_index] -= pkt_len;
2389         pipe->tc_ov_credits -= pipe_tc_ov_mask2[tc_index] & pkt_len;
2390
2391         return 1;
2392 }
2393
2394
2395 static inline int
2396 grinder_schedule(struct rte_sched_port *port,
2397         struct rte_sched_subport *subport, uint32_t pos)
2398 {
2399         struct rte_sched_grinder *grinder = subport->grinder + pos;
2400         struct rte_sched_queue *queue = grinder->queue[grinder->qpos];
2401         uint32_t qindex = grinder->qindex[grinder->qpos];
2402         struct rte_mbuf *pkt = grinder->pkt;
2403         uint32_t pkt_len = pkt->pkt_len + port->frame_overhead;
2404         uint32_t be_tc_active;
2405
2406         if (!grinder_credits_check(port, subport, pos))
2407                 return 0;
2408
2409         /* Advance port time */
2410         port->time += pkt_len;
2411
2412         /* Send packet */
2413         port->pkts_out[port->n_pkts_out++] = pkt;
2414         queue->qr++;
2415
2416         be_tc_active = (grinder->tc_index == RTE_SCHED_TRAFFIC_CLASS_BE) ? ~0x0 : 0x0;
2417         grinder->wrr_tokens[grinder->qpos] +=
2418                 (pkt_len * grinder->wrr_cost[grinder->qpos]) & be_tc_active;
2419
2420         if (queue->qr == queue->qw) {
2421                 rte_bitmap_clear(subport->bmp, qindex);
2422                 grinder->qmask &= ~(1 << grinder->qpos);
2423                 if (be_tc_active)
2424                         grinder->wrr_mask[grinder->qpos] = 0;
2425
2426                 rte_sched_port_red_set_queue_empty_timestamp(port, subport, qindex);
2427         }
2428
2429         rte_sched_port_pie_dequeue(subport, qindex, pkt_len, port->time_cpu_cycles);
2430
2431         /* Reset pipe loop detection */
2432         subport->pipe_loop = RTE_SCHED_PIPE_INVALID;
2433         grinder->productive = 1;
2434
2435         return 1;
2436 }
2437
2438 static inline int
2439 grinder_pipe_exists(struct rte_sched_subport *subport, uint32_t base_pipe)
2440 {
2441         uint32_t i;
2442
2443         for (i = 0; i < RTE_SCHED_PORT_N_GRINDERS; i++) {
2444                 if (subport->grinder_base_bmp_pos[i] == base_pipe)
2445                         return 1;
2446         }
2447
2448         return 0;
2449 }
2450
2451 static inline void
2452 grinder_pcache_populate(struct rte_sched_subport *subport,
2453         uint32_t pos, uint32_t bmp_pos, uint64_t bmp_slab)
2454 {
2455         struct rte_sched_grinder *grinder = subport->grinder + pos;
2456         uint16_t w[4];
2457
2458         grinder->pcache_w = 0;
2459         grinder->pcache_r = 0;
2460
2461         w[0] = (uint16_t) bmp_slab;
2462         w[1] = (uint16_t) (bmp_slab >> 16);
2463         w[2] = (uint16_t) (bmp_slab >> 32);
2464         w[3] = (uint16_t) (bmp_slab >> 48);
2465
2466         grinder->pcache_qmask[grinder->pcache_w] = w[0];
2467         grinder->pcache_qindex[grinder->pcache_w] = bmp_pos;
2468         grinder->pcache_w += (w[0] != 0);
2469
2470         grinder->pcache_qmask[grinder->pcache_w] = w[1];
2471         grinder->pcache_qindex[grinder->pcache_w] = bmp_pos + 16;
2472         grinder->pcache_w += (w[1] != 0);
2473
2474         grinder->pcache_qmask[grinder->pcache_w] = w[2];
2475         grinder->pcache_qindex[grinder->pcache_w] = bmp_pos + 32;
2476         grinder->pcache_w += (w[2] != 0);
2477
2478         grinder->pcache_qmask[grinder->pcache_w] = w[3];
2479         grinder->pcache_qindex[grinder->pcache_w] = bmp_pos + 48;
2480         grinder->pcache_w += (w[3] != 0);
2481 }
2482
2483 static inline void
2484 grinder_tccache_populate(struct rte_sched_subport *subport,
2485         uint32_t pos, uint32_t qindex, uint16_t qmask)
2486 {
2487         struct rte_sched_grinder *grinder = subport->grinder + pos;
2488         uint8_t b, i;
2489
2490         grinder->tccache_w = 0;
2491         grinder->tccache_r = 0;
2492
2493         for (i = 0; i < RTE_SCHED_TRAFFIC_CLASS_BE; i++) {
2494                 b = (uint8_t) ((qmask >> i) & 0x1);
2495                 grinder->tccache_qmask[grinder->tccache_w] = b;
2496                 grinder->tccache_qindex[grinder->tccache_w] = qindex + i;
2497                 grinder->tccache_w += (b != 0);
2498         }
2499
2500         b = (uint8_t) (qmask >> (RTE_SCHED_TRAFFIC_CLASS_BE));
2501         grinder->tccache_qmask[grinder->tccache_w] = b;
2502         grinder->tccache_qindex[grinder->tccache_w] = qindex +
2503                 RTE_SCHED_TRAFFIC_CLASS_BE;
2504         grinder->tccache_w += (b != 0);
2505 }
2506
2507 static inline int
2508 grinder_next_tc(struct rte_sched_port *port,
2509         struct rte_sched_subport *subport, uint32_t pos)
2510 {
2511         struct rte_sched_grinder *grinder = subport->grinder + pos;
2512         struct rte_mbuf **qbase;
2513         uint32_t qindex;
2514         uint16_t qsize;
2515
2516         if (grinder->tccache_r == grinder->tccache_w)
2517                 return 0;
2518
2519         qindex = grinder->tccache_qindex[grinder->tccache_r];
2520         qbase = rte_sched_subport_pipe_qbase(subport, qindex);
2521         qsize = rte_sched_subport_pipe_qsize(port, subport, qindex);
2522
2523         grinder->tc_index = rte_sched_port_pipe_tc(port, qindex);
2524         grinder->qmask = grinder->tccache_qmask[grinder->tccache_r];
2525         grinder->qsize = qsize;
2526
2527         if (grinder->tc_index < RTE_SCHED_TRAFFIC_CLASS_BE) {
2528                 grinder->queue[0] = subport->queue + qindex;
2529                 grinder->qbase[0] = qbase;
2530                 grinder->qindex[0] = qindex;
2531                 grinder->tccache_r++;
2532
2533                 return 1;
2534         }
2535
2536         grinder->queue[0] = subport->queue + qindex;
2537         grinder->queue[1] = subport->queue + qindex + 1;
2538         grinder->queue[2] = subport->queue + qindex + 2;
2539         grinder->queue[3] = subport->queue + qindex + 3;
2540
2541         grinder->qbase[0] = qbase;
2542         grinder->qbase[1] = qbase + qsize;
2543         grinder->qbase[2] = qbase + 2 * qsize;
2544         grinder->qbase[3] = qbase + 3 * qsize;
2545
2546         grinder->qindex[0] = qindex;
2547         grinder->qindex[1] = qindex + 1;
2548         grinder->qindex[2] = qindex + 2;
2549         grinder->qindex[3] = qindex + 3;
2550
2551         grinder->tccache_r++;
2552         return 1;
2553 }
2554
2555 static inline int
2556 grinder_next_pipe(struct rte_sched_port *port,
2557         struct rte_sched_subport *subport, uint32_t pos)
2558 {
2559         struct rte_sched_grinder *grinder = subport->grinder + pos;
2560         uint32_t pipe_qindex;
2561         uint16_t pipe_qmask;
2562
2563         if (grinder->pcache_r < grinder->pcache_w) {
2564                 pipe_qmask = grinder->pcache_qmask[grinder->pcache_r];
2565                 pipe_qindex = grinder->pcache_qindex[grinder->pcache_r];
2566                 grinder->pcache_r++;
2567         } else {
2568                 uint64_t bmp_slab = 0;
2569                 uint32_t bmp_pos = 0;
2570
2571                 /* Get another non-empty pipe group */
2572                 if (unlikely(rte_bitmap_scan(subport->bmp, &bmp_pos, &bmp_slab) <= 0))
2573                         return 0;
2574
2575 #ifdef RTE_SCHED_DEBUG
2576                 debug_check_queue_slab(subport, bmp_pos, bmp_slab);
2577 #endif
2578
2579                 /* Return if pipe group already in one of the other grinders */
2580                 subport->grinder_base_bmp_pos[pos] = RTE_SCHED_BMP_POS_INVALID;
2581                 if (unlikely(grinder_pipe_exists(subport, bmp_pos)))
2582                         return 0;
2583
2584                 subport->grinder_base_bmp_pos[pos] = bmp_pos;
2585
2586                 /* Install new pipe group into grinder's pipe cache */
2587                 grinder_pcache_populate(subport, pos, bmp_pos, bmp_slab);
2588
2589                 pipe_qmask = grinder->pcache_qmask[0];
2590                 pipe_qindex = grinder->pcache_qindex[0];
2591                 grinder->pcache_r = 1;
2592         }
2593
2594         /* Install new pipe in the grinder */
2595         grinder->pindex = pipe_qindex >> 4;
2596         grinder->subport = subport;
2597         grinder->pipe = subport->pipe + grinder->pindex;
2598         grinder->pipe_params = NULL; /* to be set after the pipe structure is prefetched */
2599         grinder->productive = 0;
2600
2601         grinder_tccache_populate(subport, pos, pipe_qindex, pipe_qmask);
2602         grinder_next_tc(port, subport, pos);
2603
2604         /* Check for pipe exhaustion */
2605         if (grinder->pindex == subport->pipe_loop) {
2606                 subport->pipe_exhaustion = 1;
2607                 subport->pipe_loop = RTE_SCHED_PIPE_INVALID;
2608         }
2609
2610         return 1;
2611 }
2612
2613
2614 static inline void
2615 grinder_wrr_load(struct rte_sched_subport *subport, uint32_t pos)
2616 {
2617         struct rte_sched_grinder *grinder = subport->grinder + pos;
2618         struct rte_sched_pipe *pipe = grinder->pipe;
2619         struct rte_sched_pipe_profile *pipe_params = grinder->pipe_params;
2620         uint32_t qmask = grinder->qmask;
2621
2622         grinder->wrr_tokens[0] =
2623                 ((uint16_t) pipe->wrr_tokens[0]) << RTE_SCHED_WRR_SHIFT;
2624         grinder->wrr_tokens[1] =
2625                 ((uint16_t) pipe->wrr_tokens[1]) << RTE_SCHED_WRR_SHIFT;
2626         grinder->wrr_tokens[2] =
2627                 ((uint16_t) pipe->wrr_tokens[2]) << RTE_SCHED_WRR_SHIFT;
2628         grinder->wrr_tokens[3] =
2629                 ((uint16_t) pipe->wrr_tokens[3]) << RTE_SCHED_WRR_SHIFT;
2630
2631         grinder->wrr_mask[0] = (qmask & 0x1) * 0xFFFF;
2632         grinder->wrr_mask[1] = ((qmask >> 1) & 0x1) * 0xFFFF;
2633         grinder->wrr_mask[2] = ((qmask >> 2) & 0x1) * 0xFFFF;
2634         grinder->wrr_mask[3] = ((qmask >> 3) & 0x1) * 0xFFFF;
2635
2636         grinder->wrr_cost[0] = pipe_params->wrr_cost[0];
2637         grinder->wrr_cost[1] = pipe_params->wrr_cost[1];
2638         grinder->wrr_cost[2] = pipe_params->wrr_cost[2];
2639         grinder->wrr_cost[3] = pipe_params->wrr_cost[3];
2640 }
2641
2642 static inline void
2643 grinder_wrr_store(struct rte_sched_subport *subport, uint32_t pos)
2644 {
2645         struct rte_sched_grinder *grinder = subport->grinder + pos;
2646         struct rte_sched_pipe *pipe = grinder->pipe;
2647
2648         pipe->wrr_tokens[0] =
2649                         (grinder->wrr_tokens[0] & grinder->wrr_mask[0]) >>
2650                                 RTE_SCHED_WRR_SHIFT;
2651         pipe->wrr_tokens[1] =
2652                         (grinder->wrr_tokens[1] & grinder->wrr_mask[1]) >>
2653                                 RTE_SCHED_WRR_SHIFT;
2654         pipe->wrr_tokens[2] =
2655                         (grinder->wrr_tokens[2] & grinder->wrr_mask[2]) >>
2656                                 RTE_SCHED_WRR_SHIFT;
2657         pipe->wrr_tokens[3] =
2658                         (grinder->wrr_tokens[3] & grinder->wrr_mask[3]) >>
2659                                 RTE_SCHED_WRR_SHIFT;
2660 }
2661
2662 static inline void
2663 grinder_wrr(struct rte_sched_subport *subport, uint32_t pos)
2664 {
2665         struct rte_sched_grinder *grinder = subport->grinder + pos;
2666         uint16_t wrr_tokens_min;
2667
2668         grinder->wrr_tokens[0] |= ~grinder->wrr_mask[0];
2669         grinder->wrr_tokens[1] |= ~grinder->wrr_mask[1];
2670         grinder->wrr_tokens[2] |= ~grinder->wrr_mask[2];
2671         grinder->wrr_tokens[3] |= ~grinder->wrr_mask[3];
2672
2673         grinder->qpos = rte_min_pos_4_u16(grinder->wrr_tokens);
2674         wrr_tokens_min = grinder->wrr_tokens[grinder->qpos];
2675
2676         grinder->wrr_tokens[0] -= wrr_tokens_min;
2677         grinder->wrr_tokens[1] -= wrr_tokens_min;
2678         grinder->wrr_tokens[2] -= wrr_tokens_min;
2679         grinder->wrr_tokens[3] -= wrr_tokens_min;
2680 }
2681
2682
2683 #define grinder_evict(subport, pos)
2684
2685 static inline void
2686 grinder_prefetch_pipe(struct rte_sched_subport *subport, uint32_t pos)
2687 {
2688         struct rte_sched_grinder *grinder = subport->grinder + pos;
2689
2690         rte_prefetch0(grinder->pipe);
2691         rte_prefetch0(grinder->queue[0]);
2692 }
2693
2694 static inline void
2695 grinder_prefetch_tc_queue_arrays(struct rte_sched_subport *subport, uint32_t pos)
2696 {
2697         struct rte_sched_grinder *grinder = subport->grinder + pos;
2698         uint16_t qsize, qr[RTE_SCHED_MAX_QUEUES_PER_TC];
2699
2700         qsize = grinder->qsize;
2701         grinder->qpos = 0;
2702
2703         if (grinder->tc_index < RTE_SCHED_TRAFFIC_CLASS_BE) {
2704                 qr[0] = grinder->queue[0]->qr & (qsize - 1);
2705
2706                 rte_prefetch0(grinder->qbase[0] + qr[0]);
2707                 return;
2708         }
2709
2710         qr[0] = grinder->queue[0]->qr & (qsize - 1);
2711         qr[1] = grinder->queue[1]->qr & (qsize - 1);
2712         qr[2] = grinder->queue[2]->qr & (qsize - 1);
2713         qr[3] = grinder->queue[3]->qr & (qsize - 1);
2714
2715         rte_prefetch0(grinder->qbase[0] + qr[0]);
2716         rte_prefetch0(grinder->qbase[1] + qr[1]);
2717
2718         grinder_wrr_load(subport, pos);
2719         grinder_wrr(subport, pos);
2720
2721         rte_prefetch0(grinder->qbase[2] + qr[2]);
2722         rte_prefetch0(grinder->qbase[3] + qr[3]);
2723 }
2724
2725 static inline void
2726 grinder_prefetch_mbuf(struct rte_sched_subport *subport, uint32_t pos)
2727 {
2728         struct rte_sched_grinder *grinder = subport->grinder + pos;
2729         uint32_t qpos = grinder->qpos;
2730         struct rte_mbuf **qbase = grinder->qbase[qpos];
2731         uint16_t qsize = grinder->qsize;
2732         uint16_t qr = grinder->queue[qpos]->qr & (qsize - 1);
2733
2734         grinder->pkt = qbase[qr];
2735         rte_prefetch0(grinder->pkt);
2736
2737         if (unlikely((qr & 0x7) == 7)) {
2738                 uint16_t qr_next = (grinder->queue[qpos]->qr + 1) & (qsize - 1);
2739
2740                 rte_prefetch0(qbase + qr_next);
2741         }
2742 }
2743
2744 static inline uint32_t
2745 grinder_handle(struct rte_sched_port *port,
2746         struct rte_sched_subport *subport, uint32_t pos)
2747 {
2748         struct rte_sched_grinder *grinder = subport->grinder + pos;
2749
2750         switch (grinder->state) {
2751         case e_GRINDER_PREFETCH_PIPE:
2752         {
2753                 if (grinder_next_pipe(port, subport, pos)) {
2754                         grinder_prefetch_pipe(subport, pos);
2755                         subport->busy_grinders++;
2756
2757                         grinder->state = e_GRINDER_PREFETCH_TC_QUEUE_ARRAYS;
2758                         return 0;
2759                 }
2760
2761                 return 0;
2762         }
2763
2764         case e_GRINDER_PREFETCH_TC_QUEUE_ARRAYS:
2765         {
2766                 struct rte_sched_pipe *pipe = grinder->pipe;
2767
2768                 grinder->pipe_params = subport->pipe_profiles + pipe->profile;
2769                 grinder->subport_params = port->subport_profiles +
2770                                                 subport->profile;
2771
2772                 grinder_prefetch_tc_queue_arrays(subport, pos);
2773                 grinder_credits_update(port, subport, pos);
2774
2775                 grinder->state = e_GRINDER_PREFETCH_MBUF;
2776                 return 0;
2777         }
2778
2779         case e_GRINDER_PREFETCH_MBUF:
2780         {
2781                 grinder_prefetch_mbuf(subport, pos);
2782
2783                 grinder->state = e_GRINDER_READ_MBUF;
2784                 return 0;
2785         }
2786
2787         case e_GRINDER_READ_MBUF:
2788         {
2789                 uint32_t wrr_active, result = 0;
2790
2791                 result = grinder_schedule(port, subport, pos);
2792
2793                 wrr_active = (grinder->tc_index == RTE_SCHED_TRAFFIC_CLASS_BE);
2794
2795                 /* Look for next packet within the same TC */
2796                 if (result && grinder->qmask) {
2797                         if (wrr_active)
2798                                 grinder_wrr(subport, pos);
2799
2800                         grinder_prefetch_mbuf(subport, pos);
2801
2802                         return 1;
2803                 }
2804
2805                 if (wrr_active)
2806                         grinder_wrr_store(subport, pos);
2807
2808                 /* Look for another active TC within same pipe */
2809                 if (grinder_next_tc(port, subport, pos)) {
2810                         grinder_prefetch_tc_queue_arrays(subport, pos);
2811
2812                         grinder->state = e_GRINDER_PREFETCH_MBUF;
2813                         return result;
2814                 }
2815
2816                 if (grinder->productive == 0 &&
2817                     subport->pipe_loop == RTE_SCHED_PIPE_INVALID)
2818                         subport->pipe_loop = grinder->pindex;
2819
2820                 grinder_evict(subport, pos);
2821
2822                 /* Look for another active pipe */
2823                 if (grinder_next_pipe(port, subport, pos)) {
2824                         grinder_prefetch_pipe(subport, pos);
2825
2826                         grinder->state = e_GRINDER_PREFETCH_TC_QUEUE_ARRAYS;
2827                         return result;
2828                 }
2829
2830                 /* No active pipe found */
2831                 subport->busy_grinders--;
2832
2833                 grinder->state = e_GRINDER_PREFETCH_PIPE;
2834                 return result;
2835         }
2836
2837         default:
2838                 rte_panic("Algorithmic error (invalid state)\n");
2839                 return 0;
2840         }
2841 }
2842
2843 static inline void
2844 rte_sched_port_time_resync(struct rte_sched_port *port)
2845 {
2846         uint64_t cycles = rte_get_tsc_cycles();
2847         uint64_t cycles_diff;
2848         uint64_t bytes_diff;
2849         uint32_t i;
2850
2851         if (cycles < port->time_cpu_cycles)
2852                 port->time_cpu_cycles = 0;
2853
2854         cycles_diff = cycles - port->time_cpu_cycles;
2855         /* Compute elapsed time in bytes */
2856         bytes_diff = rte_reciprocal_divide(cycles_diff << RTE_SCHED_TIME_SHIFT,
2857                                            port->inv_cycles_per_byte);
2858
2859         /* Advance port time */
2860         port->time_cpu_cycles +=
2861                 (bytes_diff * port->cycles_per_byte) >> RTE_SCHED_TIME_SHIFT;
2862         port->time_cpu_bytes += bytes_diff;
2863         if (port->time < port->time_cpu_bytes)
2864                 port->time = port->time_cpu_bytes;
2865
2866         /* Reset pipe loop detection */
2867         for (i = 0; i < port->n_subports_per_port; i++)
2868                 port->subports[i]->pipe_loop = RTE_SCHED_PIPE_INVALID;
2869 }
2870
2871 static inline int
2872 rte_sched_port_exceptions(struct rte_sched_subport *subport, int second_pass)
2873 {
2874         int exceptions;
2875
2876         /* Check if any exception flag is set */
2877         exceptions = (second_pass && subport->busy_grinders == 0) ||
2878                 (subport->pipe_exhaustion == 1);
2879
2880         /* Clear exception flags */
2881         subport->pipe_exhaustion = 0;
2882
2883         return exceptions;
2884 }
2885
2886 int
2887 rte_sched_port_dequeue(struct rte_sched_port *port, struct rte_mbuf **pkts, uint32_t n_pkts)
2888 {
2889         struct rte_sched_subport *subport;
2890         uint32_t subport_id = port->subport_id;
2891         uint32_t i, n_subports = 0, count;
2892
2893         port->pkts_out = pkts;
2894         port->n_pkts_out = 0;
2895
2896         rte_sched_port_time_resync(port);
2897
2898         /* Take each queue in the grinder one step further */
2899         for (i = 0, count = 0; ; i++)  {
2900                 subport = port->subports[subport_id];
2901
2902                 count += grinder_handle(port, subport,
2903                                 i & (RTE_SCHED_PORT_N_GRINDERS - 1));
2904
2905                 if (count == n_pkts) {
2906                         subport_id++;
2907
2908                         if (subport_id == port->n_subports_per_port)
2909                                 subport_id = 0;
2910
2911                         port->subport_id = subport_id;
2912                         break;
2913                 }
2914
2915                 if (rte_sched_port_exceptions(subport, i >= RTE_SCHED_PORT_N_GRINDERS)) {
2916                         i = 0;
2917                         subport_id++;
2918                         n_subports++;
2919                 }
2920
2921                 if (subport_id == port->n_subports_per_port)
2922                         subport_id = 0;
2923
2924                 if (n_subports == port->n_subports_per_port) {
2925                         port->subport_id = subport_id;
2926                         break;
2927                 }
2928         }
2929
2930         return count;
2931 }