drivers/net/mlx5/mlx5_flow_age.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2020 Mellanox Technologies, Ltd
   3  */
   4 #include <mlx5_prm.h>
   5 #include <rte_malloc.h>
   6 #include <rte_cycles.h>
   7
   8 #include <mlx5_malloc.h>
   9 #include <mlx5_common_os.h>
  10
  11 #include "mlx5.h"
  12 #include "mlx5_flow.h"
  13
  14 /**
  15  * Destroy Completion Queue used for ASO access.
  16  *
  17  * @param[in] cq
  18  *   ASO CQ to destroy.
  19  */
  20 static void
  21 mlx5_aso_cq_destroy(struct mlx5_aso_cq *cq)
  22 {
  23         if (cq->cq)
  24                 claim_zero(mlx5_devx_cmd_destroy(cq->cq));
  25         if (cq->umem_obj)
  26                 claim_zero(mlx5_glue->devx_umem_dereg(cq->umem_obj));
  27         if (cq->umem_buf)
  28                 mlx5_free((void *)(uintptr_t)cq->umem_buf);
  29         memset(cq, 0, sizeof(*cq));
  30 }
  31
  32 /**
  33  * Create Completion Queue used for ASO access.
  34  *
  35  * @param[in] ctx
  36  *   Context returned from mlx5 open_device() glue function.
  37  * @param[in/out] cq
  38  *   Pointer to CQ to create.
  39  * @param[in] log_desc_n
  40  *   Log of number of descriptors in queue.
  41  * @param[in] socket
  42  *   Socket to use for allocation.
  43  * @param[in] uar_page_id
  44  *   UAR page ID to use.
  45  * @param[in] eqn
  46  *   EQ number.
  47  *
  48  * @return
  49  *   0 on success, a negative errno value otherwise and rte_errno is set.
  50  */
  51 static int
  52 mlx5_aso_cq_create(void *ctx, struct mlx5_aso_cq *cq, uint16_t log_desc_n,
  53                    int socket, int uar_page_id, uint32_t eqn)
  54 {
  55         struct mlx5_devx_cq_attr attr = { 0 };
  56         size_t pgsize = sysconf(_SC_PAGESIZE);
  57         uint32_t umem_size;
  58         uint16_t cq_size = 1 << log_desc_n;
  59
  60         cq->log_desc_n = log_desc_n;
  61         umem_size = sizeof(struct mlx5_cqe) * cq_size + sizeof(*cq->db_rec) * 2;
  62         cq->umem_buf = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, umem_size,
  63                                    4096, socket);
  64         if (!cq->umem_buf) {
  65                 DRV_LOG(ERR, "Failed to allocate memory for CQ.");
  66                 rte_errno = ENOMEM;
  67                 return -ENOMEM;
  68         }
  69         cq->umem_obj = mlx5_glue->devx_umem_reg(ctx,
  70                                                 (void *)(uintptr_t)cq->umem_buf,
  71                                                 umem_size,
  72                                                 IBV_ACCESS_LOCAL_WRITE);
  73         if (!cq->umem_obj) {
  74                 DRV_LOG(ERR, "Failed to register umem for aso CQ.");
  75                 goto error;
  76         }
  77         attr.q_umem_valid = 1;
  78         attr.db_umem_valid = 1;
  79         attr.use_first_only = 0;
  80         attr.overrun_ignore = 0;
  81         attr.uar_page_id = uar_page_id;
  82         attr.q_umem_id = mlx5_os_get_umem_id(cq->umem_obj);
  83         attr.q_umem_offset = 0;
  84         attr.db_umem_id = attr.q_umem_id;
  85         attr.db_umem_offset = sizeof(struct mlx5_cqe) * cq_size;
  86         attr.eqn = eqn;
  87         attr.log_cq_size = log_desc_n;
  88         attr.log_page_size = rte_log2_u32(pgsize);
  89         cq->cq = mlx5_devx_cmd_create_cq(ctx, &attr);
  90         if (!cq->cq)
  91                 goto error;
  92         cq->db_rec = RTE_PTR_ADD(cq->umem_buf, (uintptr_t)attr.db_umem_offset);
  93         cq->cq_ci = 0;
  94         memset((void *)(uintptr_t)cq->umem_buf, 0xFF, attr.db_umem_offset);
  95         return 0;
  96 error:
  97         mlx5_aso_cq_destroy(cq);
  98         return -1;
  99 }
 100
 101 /**
 102  * Free MR resources.
 103  *
 104  * @param[in] mr
 105  *   MR to free.
 106  */
 107 static void
 108 mlx5_aso_devx_dereg_mr(struct mlx5_aso_devx_mr *mr)
 109 {
 110         claim_zero(mlx5_devx_cmd_destroy(mr->mkey));
 111         if (!mr->is_indirect && mr->umem)
 112                 claim_zero(mlx5_glue->devx_umem_dereg(mr->umem));
 113         mlx5_free(mr->buf);
 114         memset(mr, 0, sizeof(*mr));
 115 }
 116
 117 /**
 118  * Register Memory Region.
 119  *
 120  * @param[in] ctx
 121  *   Context returned from mlx5 open_device() glue function.
 122  * @param[in] length
 123  *   Size of MR buffer.
 124  * @param[in/out] mr
 125  *   Pointer to MR to create.
 126  * @param[in] socket
 127  *   Socket to use for allocation.
 128  * @param[in] pdn
 129  *   Protection Domain number to use.
 130  *
 131  * @return
 132  *   0 on success, a negative errno value otherwise and rte_errno is set.
 133  */
 134 static int
 135 mlx5_aso_devx_reg_mr(void *ctx, size_t length, struct mlx5_aso_devx_mr *mr,
 136                      int socket, int pdn)
 137 {
 138         struct mlx5_devx_mkey_attr mkey_attr;
 139
 140         mr->buf = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, length, 4096,
 141                               socket);
 142         if (!mr->buf) {
 143                 DRV_LOG(ERR, "Failed to create ASO bits mem for MR by Devx.");
 144                 return -1;
 145         }
 146         mr->umem = mlx5_glue->devx_umem_reg(ctx, mr->buf, length,
 147                                                  IBV_ACCESS_LOCAL_WRITE);
 148         if (!mr->umem) {
 149                 DRV_LOG(ERR, "Failed to register Umem for MR by Devx.");
 150                 goto error;
 151         }
 152         mkey_attr.addr = (uintptr_t)mr->buf;
 153         mkey_attr.size = length;
 154         mkey_attr.umem_id = mlx5_os_get_umem_id(mr->umem);
 155         mkey_attr.pd = pdn;
 156         mkey_attr.pg_access = 1;
 157         mkey_attr.klm_array = NULL;
 158         mkey_attr.klm_num = 0;
 159         mkey_attr.relaxed_ordering = 0;
 160         mr->mkey = mlx5_devx_cmd_mkey_create(ctx, &mkey_attr);
 161         if (!mr->mkey) {
 162                 DRV_LOG(ERR, "Failed to create direct Mkey.");
 163                 goto error;
 164         }
 165         mr->length = length;
 166         mr->is_indirect = false;
 167         return 0;
 168 error:
 169         if (mr->umem)
 170                 claim_zero(mlx5_glue->devx_umem_dereg(mr->umem));
 171         mlx5_free(mr->buf);
 172         return -1;
 173 }
 174
 175 /**
 176  * Destroy Send Queue used for ASO access.
 177  *
 178  * @param[in] sq
 179  *   ASO SQ to destroy.
 180  */
 181 static void
 182 mlx5_aso_destroy_sq(struct mlx5_aso_sq *sq)
 183 {
 184         if (sq->wqe_umem) {
 185                 mlx5_glue->devx_umem_dereg(sq->wqe_umem);
 186                 sq->wqe_umem = NULL;
 187         }
 188         if (sq->umem_buf) {
 189                 mlx5_free((void *)(uintptr_t)sq->umem_buf);
 190                 sq->umem_buf = NULL;
 191         }
 192         if (sq->sq) {
 193                 mlx5_devx_cmd_destroy(sq->sq);
 194                 sq->sq = NULL;
 195         }
 196         if (sq->cq.cq)
 197                 mlx5_aso_cq_destroy(&sq->cq);
 198         if (sq->uar_obj)
 199                 mlx5_glue->devx_free_uar(sq->uar_obj);
 200         mlx5_aso_devx_dereg_mr(&sq->mr);
 201         memset(sq, 0, sizeof(*sq));
 202 }
 203
 204 /**
 205  * Initialize Send Queue used for ASO access.
 206  *
 207  * @param[in] sq
 208  *   ASO SQ to initialize.
 209  */
 210 static void
 211 mlx5_aso_init_sq(struct mlx5_aso_sq *sq)
 212 {
 213         volatile struct mlx5_aso_wqe *restrict wqe;
 214         int i;
 215         int size = 1 << sq->log_desc_n;
 216         uint64_t addr;
 217
 218         /* All the next fields state should stay constant. */
 219         for (i = 0, wqe = &sq->wqes[0]; i < size; ++i, ++wqe) {
 220                 wqe->general_cseg.sq_ds = rte_cpu_to_be_32((sq->sqn << 8) |
 221                                                           (sizeof(*wqe) >> 4));
 222                 wqe->aso_cseg.lkey = rte_cpu_to_be_32(sq->mr.mkey->id);
 223                 addr = (uint64_t)((uint64_t *)sq->mr.buf + i *
 224                                             MLX5_ASO_AGE_ACTIONS_PER_POOL / 64);
 225                 wqe->aso_cseg.va_h = rte_cpu_to_be_32((uint32_t)(addr >> 32));
 226                 wqe->aso_cseg.va_l_r = rte_cpu_to_be_32((uint32_t)addr | 1u);
 227                 wqe->aso_cseg.operand_masks = rte_cpu_to_be_32
 228                         (0u |
 229                          (ASO_OPER_LOGICAL_OR << ASO_CSEG_COND_OPER_OFFSET) |
 230                          (ASO_OP_ALWAYS_TRUE << ASO_CSEG_COND_1_OPER_OFFSET) |
 231                          (ASO_OP_ALWAYS_TRUE << ASO_CSEG_COND_0_OPER_OFFSET) |
 232                          (BYTEWISE_64BYTE << ASO_CSEG_DATA_MASK_MODE_OFFSET));
 233                 wqe->aso_cseg.data_mask = RTE_BE64(UINT64_MAX);
 234         }
 235 }
 236
 237 /**
 238  * Create Send Queue used for ASO access.
 239  *
 240  * @param[in] ctx
 241  *   Context returned from mlx5 open_device() glue function.
 242  * @param[in/out] sq
 243  *   Pointer to SQ to create.
 244  * @param[in] socket
 245  *   Socket to use for allocation.
 246  * @param[in] pdn
 247  *   Protection Domain number to use.
 248  * @param[in] eqn
 249  *   EQ number.
 250  * @param[in] log_desc_n
 251  *   Log of number of descriptors in queue.
 252  *
 253  * @return
 254  *   0 on success, a negative errno value otherwise and rte_errno is set.
 255  */
 256 static int
 257 mlx5_aso_sq_create(void *ctx, struct mlx5_aso_sq *sq, int socket,
 258                    uint32_t pdn, uint32_t eqn,  uint16_t log_desc_n)
 259 {
 260         struct mlx5_devx_create_sq_attr attr = { 0 };
 261         struct mlx5_devx_modify_sq_attr modify_attr = { 0 };
 262         size_t pgsize = sysconf(_SC_PAGESIZE);
 263         struct mlx5_devx_wq_attr *wq_attr = &attr.wq_attr;
 264         uint32_t sq_desc_n = 1 << log_desc_n;
 265         uint32_t wq_size = sizeof(struct mlx5_aso_wqe) * sq_desc_n;
 266         int ret;
 267
 268         if (mlx5_aso_devx_reg_mr(ctx, (MLX5_ASO_AGE_ACTIONS_PER_POOL / 8) *
 269                                  sq_desc_n, &sq->mr, socket, pdn))
 270                 return -1;
 271         sq->uar_obj = mlx5_glue->devx_alloc_uar(ctx, 0);
 272         if (!sq->uar_obj)
 273                 goto error;
 274         if (mlx5_aso_cq_create(ctx, &sq->cq, log_desc_n, socket,
 275                                 mlx5_os_get_devx_uar_page_id(sq->uar_obj), eqn))
 276                 goto error;
 277         sq->log_desc_n = log_desc_n;
 278         sq->umem_buf = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, wq_size +
 279                                    sizeof(*sq->db_rec) * 2, 4096, socket);
 280         if (!sq->umem_buf) {
 281                 DRV_LOG(ERR, "Can't allocate wqe buffer.");
 282                 return -ENOMEM;
 283         }
 284         sq->wqe_umem = mlx5_glue->devx_umem_reg(ctx,
 285                                                 (void *)(uintptr_t)sq->umem_buf,
 286                                                 wq_size +
 287                                                 sizeof(*sq->db_rec) * 2,
 288                                                 IBV_ACCESS_LOCAL_WRITE);
 289         if (!sq->wqe_umem) {
 290                 DRV_LOG(ERR, "Failed to register umem for SQ.");
 291                 rte_errno = ENOMEM;
 292                 goto error;
 293         }
 294         attr.state = MLX5_SQC_STATE_RST;
 295         attr.tis_lst_sz = 0;
 296         attr.tis_num = 0;
 297         attr.user_index = 0xFFFF;
 298         attr.cqn = sq->cq.cq->id;
 299         wq_attr->uar_page = mlx5_os_get_devx_uar_page_id(sq->uar_obj);
 300         wq_attr->pd = pdn;
 301         wq_attr->wq_type = MLX5_WQ_TYPE_CYCLIC;
 302         wq_attr->log_wq_pg_sz = rte_log2_u32(pgsize);
 303         wq_attr->wq_umem_id = mlx5_os_get_umem_id(sq->wqe_umem);
 304         wq_attr->wq_umem_offset = 0;
 305         wq_attr->wq_umem_valid = 1;
 306         wq_attr->log_wq_stride = 6;
 307         wq_attr->log_wq_sz = rte_log2_u32(wq_size) - 6;
 308         wq_attr->dbr_umem_id = wq_attr->wq_umem_id;
 309         wq_attr->dbr_addr = wq_size;
 310         wq_attr->dbr_umem_valid = 1;
 311         sq->sq = mlx5_devx_cmd_create_sq(ctx, &attr);
 312         if (!sq->sq) {
 313                 DRV_LOG(ERR, "Can't create sq object.");
 314                 rte_errno  = ENOMEM;
 315                 goto error;
 316         }
 317         modify_attr.state = MLX5_SQC_STATE_RDY;
 318         ret = mlx5_devx_cmd_modify_sq(sq->sq, &modify_attr);
 319         if (ret) {
 320                 DRV_LOG(ERR, "Can't change sq state to ready.");
 321                 rte_errno  = ENOMEM;
 322                 goto error;
 323         }
 324         sq->ci = 0;
 325         sq->pi = 0;
 326         sq->sqn = sq->sq->id;
 327         sq->db_rec = RTE_PTR_ADD(sq->umem_buf, (uintptr_t)(wq_attr->dbr_addr));
 328         sq->uar_addr = (volatile uint64_t *)((uint8_t *)sq->uar_obj->base_addr +
 329                                                                          0x800);
 330         mlx5_aso_init_sq(sq);
 331         return 0;
 332 error:
 333         mlx5_aso_destroy_sq(sq);
 334         return -1;
 335 }
 336
 337 /**
 338  * API to create and initialize Send Queue used for ASO access.
 339  *
 340  * @param[in] sh
 341  *   Pointer to shared device context.
 342  *
 343  * @return
 344  *   0 on success, a negative errno value otherwise and rte_errno is set.
 345  */
 346 int
 347 mlx5_aso_queue_init(struct mlx5_dev_ctx_shared *sh)
 348 {
 349         return mlx5_aso_sq_create(sh->ctx, &sh->aso_age_mng->aso_sq, 0, sh->pdn,
 350                                   sh->eqn, MLX5_ASO_QUEUE_LOG_DESC);
 351 }
 352
 353 /**
 354  * API to destroy Send Queue used for ASO access.
 355  *
 356  * @param[in] sh
 357  *   Pointer to shared device context.
 358  */
 359 void
 360 mlx5_aso_queue_uninit(struct mlx5_dev_ctx_shared *sh)
 361 {
 362         mlx5_aso_destroy_sq(&sh->aso_age_mng->aso_sq);
 363 }
 364
 365 /**
 366  * Write a burst of WQEs to ASO SQ.
 367  *
 368  * @param[in] mng
 369  *   ASO management data, contains the SQ.
 370  * @param[in] n
 371  *   Index of the last valid pool.
 372  *
 373  * @return
 374  *   Number of WQEs in burst.
 375  */
 376 static uint16_t
 377 mlx5_aso_sq_enqueue_burst(struct mlx5_aso_age_mng *mng, uint16_t n)
 378 {
 379         volatile struct mlx5_aso_wqe *wqe;
 380         struct mlx5_aso_sq *sq = &mng->aso_sq;
 381         struct mlx5_aso_age_pool *pool;
 382         uint16_t size = 1 << sq->log_desc_n;
 383         uint16_t mask = size - 1;
 384         uint16_t max;
 385         uint16_t start_pi = sq->pi;
 386
 387         max = RTE_MIN(size - (uint16_t)(sq->pi - sq->ci), n - sq->next);
 388         if (unlikely(!max))
 389                 return 0;
 390         sq->elts[start_pi & mask].burst_size = max;
 391         do {
 392                 wqe = &sq->wqes[sq->pi & mask];
 393                 rte_prefetch0(&sq->wqes[(sq->pi + 1) & mask]);
 394                 /* Fill next WQE. */
 395                 rte_spinlock_lock(&mng->resize_sl);
 396                 pool = mng->pools[sq->next];
 397                 rte_spinlock_unlock(&mng->resize_sl);
 398                 sq->elts[sq->pi & mask].pool = pool;
 399                 wqe->general_cseg.misc =
 400                                 rte_cpu_to_be_32(((struct mlx5_devx_obj *)
 401                                                  (pool->flow_hit_aso_obj))->id);
 402                 wqe->general_cseg.flags = RTE_BE32(MLX5_COMP_ONLY_FIRST_ERR <<
 403                                                          MLX5_COMP_MODE_OFFSET);
 404                 wqe->general_cseg.opcode = rte_cpu_to_be_32
 405                                                 (MLX5_OPCODE_ACCESS_ASO |
 406                                                  ASO_OP_MOD_FLOW_HIT << 24 |
 407                                                  sq->pi << 9);
 408                 sq->pi++;
 409                 sq->next++;
 410                 max--;
 411         } while (max);
 412         wqe->general_cseg.flags = RTE_BE32(MLX5_COMP_ALWAYS <<
 413                                                          MLX5_COMP_MODE_OFFSET);
 414         rte_io_wmb();
 415         sq->db_rec[MLX5_SND_DBR] = rte_cpu_to_be_32(sq->pi << 1);
 416         rte_wmb();
 417         *sq->uar_addr = *(volatile uint64_t *)wqe; /* Assume 64 bit ARCH.*/
 418         rte_wmb();
 419         return sq->elts[start_pi & mask].burst_size;
 420 }
 421
 422 /**
 423  * Debug utility function. Dump contents of error CQE and WQE.
 424  *
 425  * @param[in] cqe
 426  *   Error CQE to dump.
 427  * @param[in] wqe
 428  *   Error WQE to dump.
 429  */
 430 static void
 431 mlx5_aso_dump_err_objs(volatile uint32_t *cqe, volatile uint32_t *wqe)
 432 {
 433         int i;
 434
 435         DRV_LOG(ERR, "Error cqe:");
 436         for (i = 0; i < 16; i += 4)
 437                 DRV_LOG(ERR, "%08X %08X %08X %08X", cqe[i], cqe[i + 1],
 438                         cqe[i + 2], cqe[i + 3]);
 439         DRV_LOG(ERR, "\nError wqe:");
 440         for (i = 0; i < (int)sizeof(struct mlx5_aso_wqe) / 4; i += 4)
 441                 DRV_LOG(ERR, "%08X %08X %08X %08X", wqe[i], wqe[i + 1],
 442                         wqe[i + 2], wqe[i + 3]);
 443 }
 444
 445 /**
 446  * Handle case of error CQE.
 447  *
 448  * @param[in] sq
 449  *   ASO SQ to use.
 450  */
 451 static void
 452 mlx5_aso_cqe_err_handle(struct mlx5_aso_sq *sq)
 453 {
 454         struct mlx5_aso_cq *cq = &sq->cq;
 455         uint32_t idx = cq->cq_ci & ((1 << cq->log_desc_n) - 1);
 456         volatile struct mlx5_err_cqe *cqe =
 457                                 (volatile struct mlx5_err_cqe *)&cq->cqes[idx];
 458
 459         cq->errors++;
 460         idx = rte_be_to_cpu_16(cqe->wqe_counter) & (1u << sq->log_desc_n);
 461         mlx5_aso_dump_err_objs((volatile uint32_t *)cqe,
 462                                  (volatile uint32_t *)&sq->wqes[idx]);
 463 }
 464
 465 /**
 466  * Update ASO objects upon completion.
 467  *
 468  * @param[in] sh
 469  *   Shared device context.
 470  * @param[in] n
 471  *   Number of completed ASO objects.
 472  */
 473 static void
 474 mlx5_aso_age_action_update(struct mlx5_dev_ctx_shared *sh, uint16_t n)
 475 {
 476         struct mlx5_aso_age_mng *mng = sh->aso_age_mng;
 477         struct mlx5_aso_sq *sq = &mng->aso_sq;
 478         struct mlx5_age_info *age_info;
 479         const uint16_t size = 1 << sq->log_desc_n;
 480         const uint16_t mask = size - 1;
 481         const uint64_t curr = MLX5_CURR_TIME_SEC;
 482         uint16_t expected = AGE_CANDIDATE;
 483         uint16_t i;
 484
 485         for (i = 0; i < n; ++i) {
 486                 uint16_t idx = (sq->ci + i) & mask;
 487                 struct mlx5_aso_age_pool *pool = sq->elts[idx].pool;
 488                 uint64_t diff = curr - pool->time_of_last_age_check;
 489                 uint64_t *addr = sq->mr.buf;
 490                 int j;
 491
 492                 addr += idx * MLX5_ASO_AGE_ACTIONS_PER_POOL / 64;
 493                 pool->time_of_last_age_check = curr;
 494                 for (j = 0; j < MLX5_ASO_AGE_ACTIONS_PER_POOL; j++) {
 495                         struct mlx5_aso_age_action *act = &pool->actions[j];
 496                         struct mlx5_age_param *ap = &act->age_params;
 497                         uint8_t byte;
 498                         uint8_t offset;
 499                         uint8_t *u8addr;
 500                         uint8_t hit;
 501
 502                         if (__atomic_load_n(&ap->state, __ATOMIC_RELAXED) !=
 503                                             AGE_CANDIDATE)
 504                                 continue;
 505                         byte = 63 - (j / 8);
 506                         offset = j % 8;
 507                         u8addr = (uint8_t *)addr;
 508                         hit = (u8addr[byte] >> offset) & 0x1;
 509                         if (hit) {
 510                                 __atomic_store_n(&ap->sec_since_last_hit, 0,
 511                                                  __ATOMIC_RELAXED);
 512                         } else {
 513                                 struct mlx5_priv *priv;
 514
 515                                 __atomic_fetch_add(&ap->sec_since_last_hit,
 516                                                    diff, __ATOMIC_RELAXED);
 517                                 /* If timeout passed add to aged-out list. */
 518                                 if (ap->sec_since_last_hit <= ap->timeout)
 519                                         continue;
 520                                 priv =
 521                                 rte_eth_devices[ap->port_id].data->dev_private;
 522                                 age_info = GET_PORT_AGE_INFO(priv);
 523                                 rte_spinlock_lock(&age_info->aged_sl);
 524                                 if (__atomic_compare_exchange_n(&ap->state,
 525                                                                 &expected,
 526                                                                 AGE_TMOUT,
 527                                                                 false,
 528                                                                __ATOMIC_RELAXED,
 529                                                             __ATOMIC_RELAXED)) {
 530                                         LIST_INSERT_HEAD(&age_info->aged_aso,
 531                                                          act, next);
 532                                         MLX5_AGE_SET(age_info,
 533                                                      MLX5_AGE_EVENT_NEW);
 534                                 }
 535                                 rte_spinlock_unlock(&age_info->aged_sl);
 536                         }
 537                 }
 538         }
 539         mlx5_age_event_prepare(sh);
 540 }
 541
 542 /**
 543  * Handle completions from WQEs sent to ASO SQ.
 544  *
 545  * @param[in] sh
 546  *   Shared device context.
 547  *
 548  * @return
 549  *   Number of CQEs handled.
 550  */
 551 static uint16_t
 552 mlx5_aso_completion_handle(struct mlx5_dev_ctx_shared *sh)
 553 {
 554         struct mlx5_aso_age_mng *mng = sh->aso_age_mng;
 555         struct mlx5_aso_sq *sq = &mng->aso_sq;
 556         struct mlx5_aso_cq *cq = &sq->cq;
 557         volatile struct mlx5_cqe *restrict cqe;
 558         const unsigned int cq_size = 1 << cq->log_desc_n;
 559         const unsigned int mask = cq_size - 1;
 560         uint32_t idx;
 561         uint32_t next_idx = cq->cq_ci & mask;
 562         const uint16_t max = (uint16_t)(sq->pi - sq->ci);
 563         uint16_t i = 0;
 564         int ret;
 565         if (unlikely(!max))
 566                 return 0;
 567         do {
 568                 idx = next_idx;
 569                 next_idx = (cq->cq_ci + 1) & mask;
 570                 rte_prefetch0(&cq->cqes[next_idx]);
 571                 cqe = &cq->cqes[idx];
 572                 ret = check_cqe(cqe, cq_size, cq->cq_ci);
 573                 /*
 574                  * Be sure owner read is done before any other cookie field or
 575                  * opaque field.
 576                  */
 577                 rte_io_rmb();
 578                 if (unlikely(ret != MLX5_CQE_STATUS_SW_OWN)) {
 579                         if (likely(ret == MLX5_CQE_STATUS_HW_OWN))
 580                                 break;
 581                         mlx5_aso_cqe_err_handle(sq);
 582                 } else {
 583                         i += sq->elts[(sq->ci + i) & mask].burst_size;
 584                 }
 585                 cq->cq_ci++;
 586         } while (1);
 587         if (likely(i)) {
 588                 mlx5_aso_age_action_update(sh, i);
 589                 sq->ci += i;
 590                 rte_io_wmb();
 591                 cq->db_rec[0] = rte_cpu_to_be_32(cq->cq_ci);
 592         }
 593         return i;
 594 }
 595
 596 /**
 597  * Periodically read CQEs and send WQEs to ASO SQ.
 598  *
 599  * @param[in] arg
 600  *   Shared device context containing the ASO SQ.
 601  */
 602 static void
 603 mlx5_flow_aso_alarm(void *arg)
 604 {
 605         struct mlx5_dev_ctx_shared *sh = arg;
 606         struct mlx5_aso_sq *sq = &sh->aso_age_mng->aso_sq;
 607         uint32_t us = 100u;
 608         uint16_t n;
 609
 610         rte_spinlock_lock(&sh->aso_age_mng->resize_sl);
 611         n = sh->aso_age_mng->next;
 612         rte_spinlock_unlock(&sh->aso_age_mng->resize_sl);
 613         mlx5_aso_completion_handle(sh);
 614         if (sq->next == n) {
 615                 /* End of loop: wait 1 second. */
 616                 us = US_PER_S;
 617                 sq->next = 0;
 618         }
 619         mlx5_aso_sq_enqueue_burst(sh->aso_age_mng, n);
 620         if (rte_eal_alarm_set(us, mlx5_flow_aso_alarm, sh))
 621                 DRV_LOG(ERR, "Cannot reinitialize aso alarm.");
 622 }
 623
 624 /**
 625  * API to start ASO access using ASO SQ.
 626  *
 627  * @param[in] sh
 628  *   Pointer to shared device context.
 629  *
 630  * @return
 631  *   0 on success, a negative errno value otherwise and rte_errno is set.
 632  */
 633 int
 634 mlx5_aso_queue_start(struct mlx5_dev_ctx_shared *sh)
 635 {
 636         if (rte_eal_alarm_set(US_PER_S, mlx5_flow_aso_alarm, sh)) {
 637                 DRV_LOG(ERR, "Cannot reinitialize ASO age alarm.");
 638                 return -rte_errno;
 639         }
 640         return 0;
 641 }
 642
 643 /**
 644  * API to stop ASO access using ASO SQ.
 645  *
 646  * @param[in] sh
 647  *   Pointer to shared device context.
 648  *
 649  * @return
 650  *   0 on success, a negative errno value otherwise and rte_errno is set.
 651  */
 652 int
 653 mlx5_aso_queue_stop(struct mlx5_dev_ctx_shared *sh)
 654 {
 655         int retries = 1024;
 656
 657         if (!sh->aso_age_mng->aso_sq.sq)
 658                 return -EINVAL;
 659         rte_errno = 0;
 660         while (--retries) {
 661                 rte_eal_alarm_cancel(mlx5_flow_aso_alarm, sh);
 662                 if (rte_errno != EINPROGRESS)
 663                         break;
 664                 rte_pause();
 665         }
 666         return -rte_errno;
 667 }