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_read = 0;
 160         mkey_attr.relaxed_ordering_write = 0;
 161         mr->mkey = mlx5_devx_cmd_mkey_create(ctx, &mkey_attr);
 162         if (!mr->mkey) {
 163                 DRV_LOG(ERR, "Failed to create direct Mkey.");
 164                 goto error;
 165         }
 166         mr->length = length;
 167         mr->is_indirect = false;
 168         return 0;
 169 error:
 170         if (mr->umem)
 171                 claim_zero(mlx5_glue->devx_umem_dereg(mr->umem));
 172         mlx5_free(mr->buf);
 173         return -1;
 174 }
 175
 176 /**
 177  * Destroy Send Queue used for ASO access.
 178  *
 179  * @param[in] sq
 180  *   ASO SQ to destroy.
 181  */
 182 static void
 183 mlx5_aso_destroy_sq(struct mlx5_aso_sq *sq)
 184 {
 185         if (sq->wqe_umem) {
 186                 mlx5_glue->devx_umem_dereg(sq->wqe_umem);
 187                 sq->wqe_umem = NULL;
 188         }
 189         if (sq->umem_buf) {
 190                 mlx5_free((void *)(uintptr_t)sq->umem_buf);
 191                 sq->umem_buf = NULL;
 192         }
 193         if (sq->sq) {
 194                 mlx5_devx_cmd_destroy(sq->sq);
 195                 sq->sq = NULL;
 196         }
 197         if (sq->cq.cq)
 198                 mlx5_aso_cq_destroy(&sq->cq);
 199         if (sq->uar_obj)
 200                 mlx5_glue->devx_free_uar(sq->uar_obj);
 201         mlx5_aso_devx_dereg_mr(&sq->mr);
 202         memset(sq, 0, sizeof(*sq));
 203 }
 204
 205 /**
 206  * Initialize Send Queue used for ASO access.
 207  *
 208  * @param[in] sq
 209  *   ASO SQ to initialize.
 210  */
 211 static void
 212 mlx5_aso_init_sq(struct mlx5_aso_sq *sq)
 213 {
 214         volatile struct mlx5_aso_wqe *restrict wqe;
 215         int i;
 216         int size = 1 << sq->log_desc_n;
 217         uint64_t addr;
 218
 219         /* All the next fields state should stay constant. */
 220         for (i = 0, wqe = &sq->wqes[0]; i < size; ++i, ++wqe) {
 221                 wqe->general_cseg.sq_ds = rte_cpu_to_be_32((sq->sqn << 8) |
 222                                                           (sizeof(*wqe) >> 4));
 223                 wqe->aso_cseg.lkey = rte_cpu_to_be_32(sq->mr.mkey->id);
 224                 addr = (uint64_t)((uint64_t *)sq->mr.buf + i *
 225                                             MLX5_ASO_AGE_ACTIONS_PER_POOL / 64);
 226                 wqe->aso_cseg.va_h = rte_cpu_to_be_32((uint32_t)(addr >> 32));
 227                 wqe->aso_cseg.va_l_r = rte_cpu_to_be_32((uint32_t)addr | 1u);
 228                 wqe->aso_cseg.operand_masks = rte_cpu_to_be_32
 229                         (0u |
 230                          (ASO_OPER_LOGICAL_OR << ASO_CSEG_COND_OPER_OFFSET) |
 231                          (ASO_OP_ALWAYS_TRUE << ASO_CSEG_COND_1_OPER_OFFSET) |
 232                          (ASO_OP_ALWAYS_TRUE << ASO_CSEG_COND_0_OPER_OFFSET) |
 233                          (BYTEWISE_64BYTE << ASO_CSEG_DATA_MASK_MODE_OFFSET));
 234                 wqe->aso_cseg.data_mask = RTE_BE64(UINT64_MAX);
 235         }
 236 }
 237
 238 /**
 239  * Create Send Queue used for ASO access.
 240  *
 241  * @param[in] ctx
 242  *   Context returned from mlx5 open_device() glue function.
 243  * @param[in/out] sq
 244  *   Pointer to SQ to create.
 245  * @param[in] socket
 246  *   Socket to use for allocation.
 247  * @param[in] pdn
 248  *   Protection Domain number to use.
 249  * @param[in] eqn
 250  *   EQ number.
 251  * @param[in] log_desc_n
 252  *   Log of number of descriptors in queue.
 253  *
 254  * @return
 255  *   0 on success, a negative errno value otherwise and rte_errno is set.
 256  */
 257 static int
 258 mlx5_aso_sq_create(void *ctx, struct mlx5_aso_sq *sq, int socket,
 259                    uint32_t pdn, uint32_t eqn,  uint16_t log_desc_n)
 260 {
 261         struct mlx5_devx_create_sq_attr attr = { 0 };
 262         struct mlx5_devx_modify_sq_attr modify_attr = { 0 };
 263         size_t pgsize = sysconf(_SC_PAGESIZE);
 264         struct mlx5_devx_wq_attr *wq_attr = &attr.wq_attr;
 265         uint32_t sq_desc_n = 1 << log_desc_n;
 266         uint32_t wq_size = sizeof(struct mlx5_aso_wqe) * sq_desc_n;
 267         int ret;
 268
 269         if (mlx5_aso_devx_reg_mr(ctx, (MLX5_ASO_AGE_ACTIONS_PER_POOL / 8) *
 270                                  sq_desc_n, &sq->mr, socket, pdn))
 271                 return -1;
 272         sq->uar_obj = mlx5_glue->devx_alloc_uar(ctx, 0);
 273         if (!sq->uar_obj)
 274                 goto error;
 275         if (mlx5_aso_cq_create(ctx, &sq->cq, log_desc_n, socket,
 276                                 mlx5_os_get_devx_uar_page_id(sq->uar_obj), eqn))
 277                 goto error;
 278         sq->log_desc_n = log_desc_n;
 279         sq->umem_buf = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, wq_size +
 280                                    sizeof(*sq->db_rec) * 2, 4096, socket);
 281         if (!sq->umem_buf) {
 282                 DRV_LOG(ERR, "Can't allocate wqe buffer.");
 283                 return -ENOMEM;
 284         }
 285         sq->wqe_umem = mlx5_glue->devx_umem_reg(ctx,
 286                                                 (void *)(uintptr_t)sq->umem_buf,
 287                                                 wq_size +
 288                                                 sizeof(*sq->db_rec) * 2,
 289                                                 IBV_ACCESS_LOCAL_WRITE);
 290         if (!sq->wqe_umem) {
 291                 DRV_LOG(ERR, "Failed to register umem for SQ.");
 292                 rte_errno = ENOMEM;
 293                 goto error;
 294         }
 295         attr.state = MLX5_SQC_STATE_RST;
 296         attr.tis_lst_sz = 0;
 297         attr.tis_num = 0;
 298         attr.user_index = 0xFFFF;
 299         attr.cqn = sq->cq.cq->id;
 300         wq_attr->uar_page = mlx5_os_get_devx_uar_page_id(sq->uar_obj);
 301         wq_attr->pd = pdn;
 302         wq_attr->wq_type = MLX5_WQ_TYPE_CYCLIC;
 303         wq_attr->log_wq_pg_sz = rte_log2_u32(pgsize);
 304         wq_attr->wq_umem_id = mlx5_os_get_umem_id(sq->wqe_umem);
 305         wq_attr->wq_umem_offset = 0;
 306         wq_attr->wq_umem_valid = 1;
 307         wq_attr->log_wq_stride = 6;
 308         wq_attr->log_wq_sz = rte_log2_u32(wq_size) - 6;
 309         wq_attr->dbr_umem_id = wq_attr->wq_umem_id;
 310         wq_attr->dbr_addr = wq_size;
 311         wq_attr->dbr_umem_valid = 1;
 312         sq->sq = mlx5_devx_cmd_create_sq(ctx, &attr);
 313         if (!sq->sq) {
 314                 DRV_LOG(ERR, "Can't create sq object.");
 315                 rte_errno  = ENOMEM;
 316                 goto error;
 317         }
 318         modify_attr.state = MLX5_SQC_STATE_RDY;
 319         ret = mlx5_devx_cmd_modify_sq(sq->sq, &modify_attr);
 320         if (ret) {
 321                 DRV_LOG(ERR, "Can't change sq state to ready.");
 322                 rte_errno  = ENOMEM;
 323                 goto error;
 324         }
 325         sq->ci = 0;
 326         sq->pi = 0;
 327         sq->sqn = sq->sq->id;
 328         sq->db_rec = RTE_PTR_ADD(sq->umem_buf, (uintptr_t)(wq_attr->dbr_addr));
 329         sq->uar_addr = (volatile uint64_t *)((uint8_t *)sq->uar_obj->base_addr +
 330                                                                          0x800);
 331         mlx5_aso_init_sq(sq);
 332         return 0;
 333 error:
 334         mlx5_aso_destroy_sq(sq);
 335         return -1;
 336 }
 337
 338 /**
 339  * API to create and initialize Send Queue used for ASO access.
 340  *
 341  * @param[in] sh
 342  *   Pointer to shared device context.
 343  *
 344  * @return
 345  *   0 on success, a negative errno value otherwise and rte_errno is set.
 346  */
 347 int
 348 mlx5_aso_queue_init(struct mlx5_dev_ctx_shared *sh)
 349 {
 350         return mlx5_aso_sq_create(sh->ctx, &sh->aso_age_mng->aso_sq, 0, sh->pdn,
 351                                   sh->eqn, MLX5_ASO_QUEUE_LOG_DESC);
 352 }
 353
 354 /**
 355  * API to destroy Send Queue used for ASO access.
 356  *
 357  * @param[in] sh
 358  *   Pointer to shared device context.
 359  */
 360 void
 361 mlx5_aso_queue_uninit(struct mlx5_dev_ctx_shared *sh)
 362 {
 363         mlx5_aso_destroy_sq(&sh->aso_age_mng->aso_sq);
 364 }
 365
 366 /**
 367  * Write a burst of WQEs to ASO SQ.
 368  *
 369  * @param[in] mng
 370  *   ASO management data, contains the SQ.
 371  * @param[in] n
 372  *   Index of the last valid pool.
 373  *
 374  * @return
 375  *   Number of WQEs in burst.
 376  */
 377 static uint16_t
 378 mlx5_aso_sq_enqueue_burst(struct mlx5_aso_age_mng *mng, uint16_t n)
 379 {
 380         volatile struct mlx5_aso_wqe *wqe;
 381         struct mlx5_aso_sq *sq = &mng->aso_sq;
 382         struct mlx5_aso_age_pool *pool;
 383         uint16_t size = 1 << sq->log_desc_n;
 384         uint16_t mask = size - 1;
 385         uint16_t max;
 386         uint16_t start_pi = sq->pi;
 387
 388         max = RTE_MIN(size - (uint16_t)(sq->pi - sq->ci), n - sq->next);
 389         if (unlikely(!max))
 390                 return 0;
 391         sq->elts[start_pi & mask].burst_size = max;
 392         do {
 393                 wqe = &sq->wqes[sq->pi & mask];
 394                 rte_prefetch0(&sq->wqes[(sq->pi + 1) & mask]);
 395                 /* Fill next WQE. */
 396                 rte_spinlock_lock(&mng->resize_sl);
 397                 pool = mng->pools[sq->next];
 398                 rte_spinlock_unlock(&mng->resize_sl);
 399                 sq->elts[sq->pi & mask].pool = pool;
 400                 wqe->general_cseg.misc =
 401                                 rte_cpu_to_be_32(((struct mlx5_devx_obj *)
 402                                                  (pool->flow_hit_aso_obj))->id);
 403                 wqe->general_cseg.flags = RTE_BE32(MLX5_COMP_ONLY_FIRST_ERR <<
 404                                                          MLX5_COMP_MODE_OFFSET);
 405                 wqe->general_cseg.opcode = rte_cpu_to_be_32
 406                                                 (MLX5_OPCODE_ACCESS_ASO |
 407                                                  ASO_OP_MOD_FLOW_HIT << 24 |
 408                                                  sq->pi << 9);
 409                 sq->pi++;
 410                 sq->next++;
 411                 max--;
 412         } while (max);
 413         wqe->general_cseg.flags = RTE_BE32(MLX5_COMP_ALWAYS <<
 414                                                          MLX5_COMP_MODE_OFFSET);
 415         rte_io_wmb();
 416         sq->db_rec[MLX5_SND_DBR] = rte_cpu_to_be_32(sq->pi << 1);
 417         rte_wmb();
 418         *sq->uar_addr = *(volatile uint64_t *)wqe; /* Assume 64 bit ARCH.*/
 419         rte_wmb();
 420         return sq->elts[start_pi & mask].burst_size;
 421 }
 422
 423 /**
 424  * Debug utility function. Dump contents of error CQE and WQE.
 425  *
 426  * @param[in] cqe
 427  *   Error CQE to dump.
 428  * @param[in] wqe
 429  *   Error WQE to dump.
 430  */
 431 static void
 432 mlx5_aso_dump_err_objs(volatile uint32_t *cqe, volatile uint32_t *wqe)
 433 {
 434         int i;
 435
 436         DRV_LOG(ERR, "Error cqe:");
 437         for (i = 0; i < 16; i += 4)
 438                 DRV_LOG(ERR, "%08X %08X %08X %08X", cqe[i], cqe[i + 1],
 439                         cqe[i + 2], cqe[i + 3]);
 440         DRV_LOG(ERR, "\nError wqe:");
 441         for (i = 0; i < (int)sizeof(struct mlx5_aso_wqe) / 4; i += 4)
 442                 DRV_LOG(ERR, "%08X %08X %08X %08X", wqe[i], wqe[i + 1],
 443                         wqe[i + 2], wqe[i + 3]);
 444 }
 445
 446 /**
 447  * Handle case of error CQE.
 448  *
 449  * @param[in] sq
 450  *   ASO SQ to use.
 451  */
 452 static void
 453 mlx5_aso_cqe_err_handle(struct mlx5_aso_sq *sq)
 454 {
 455         struct mlx5_aso_cq *cq = &sq->cq;
 456         uint32_t idx = cq->cq_ci & ((1 << cq->log_desc_n) - 1);
 457         volatile struct mlx5_err_cqe *cqe =
 458                                 (volatile struct mlx5_err_cqe *)&cq->cqes[idx];
 459
 460         cq->errors++;
 461         idx = rte_be_to_cpu_16(cqe->wqe_counter) & (1u << sq->log_desc_n);
 462         mlx5_aso_dump_err_objs((volatile uint32_t *)cqe,
 463                                  (volatile uint32_t *)&sq->wqes[idx]);
 464 }
 465
 466 /**
 467  * Update ASO objects upon completion.
 468  *
 469  * @param[in] sh
 470  *   Shared device context.
 471  * @param[in] n
 472  *   Number of completed ASO objects.
 473  */
 474 static void
 475 mlx5_aso_age_action_update(struct mlx5_dev_ctx_shared *sh, uint16_t n)
 476 {
 477         struct mlx5_aso_age_mng *mng = sh->aso_age_mng;
 478         struct mlx5_aso_sq *sq = &mng->aso_sq;
 479         struct mlx5_age_info *age_info;
 480         const uint16_t size = 1 << sq->log_desc_n;
 481         const uint16_t mask = size - 1;
 482         const uint64_t curr = MLX5_CURR_TIME_SEC;
 483         uint16_t expected = AGE_CANDIDATE;
 484         uint16_t i;
 485
 486         for (i = 0; i < n; ++i) {
 487                 uint16_t idx = (sq->ci + i) & mask;
 488                 struct mlx5_aso_age_pool *pool = sq->elts[idx].pool;
 489                 uint64_t diff = curr - pool->time_of_last_age_check;
 490                 uint64_t *addr = sq->mr.buf;
 491                 int j;
 492
 493                 addr += idx * MLX5_ASO_AGE_ACTIONS_PER_POOL / 64;
 494                 pool->time_of_last_age_check = curr;
 495                 for (j = 0; j < MLX5_ASO_AGE_ACTIONS_PER_POOL; j++) {
 496                         struct mlx5_aso_age_action *act = &pool->actions[j];
 497                         struct mlx5_age_param *ap = &act->age_params;
 498                         uint8_t byte;
 499                         uint8_t offset;
 500                         uint8_t *u8addr;
 501                         uint8_t hit;
 502
 503                         if (__atomic_load_n(&ap->state, __ATOMIC_RELAXED) !=
 504                                             AGE_CANDIDATE)
 505                                 continue;
 506                         byte = 63 - (j / 8);
 507                         offset = j % 8;
 508                         u8addr = (uint8_t *)addr;
 509                         hit = (u8addr[byte] >> offset) & 0x1;
 510                         if (hit) {
 511                                 __atomic_store_n(&ap->sec_since_last_hit, 0,
 512                                                  __ATOMIC_RELAXED);
 513                         } else {
 514                                 struct mlx5_priv *priv;
 515
 516                                 __atomic_fetch_add(&ap->sec_since_last_hit,
 517                                                    diff, __ATOMIC_RELAXED);
 518                                 /* If timeout passed add to aged-out list. */
 519                                 if (ap->sec_since_last_hit <= ap->timeout)
 520                                         continue;
 521                                 priv =
 522                                 rte_eth_devices[ap->port_id].data->dev_private;
 523                                 age_info = GET_PORT_AGE_INFO(priv);
 524                                 rte_spinlock_lock(&age_info->aged_sl);
 525                                 if (__atomic_compare_exchange_n(&ap->state,
 526                                                                 &expected,
 527                                                                 AGE_TMOUT,
 528                                                                 false,
 529                                                                __ATOMIC_RELAXED,
 530                                                             __ATOMIC_RELAXED)) {
 531                                         LIST_INSERT_HEAD(&age_info->aged_aso,
 532                                                          act, next);
 533                                         MLX5_AGE_SET(age_info,
 534                                                      MLX5_AGE_EVENT_NEW);
 535                                 }
 536                                 rte_spinlock_unlock(&age_info->aged_sl);
 537                         }
 538                 }
 539         }
 540         mlx5_age_event_prepare(sh);
 541 }
 542
 543 /**
 544  * Handle completions from WQEs sent to ASO SQ.
 545  *
 546  * @param[in] sh
 547  *   Shared device context.
 548  *
 549  * @return
 550  *   Number of CQEs handled.
 551  */
 552 static uint16_t
 553 mlx5_aso_completion_handle(struct mlx5_dev_ctx_shared *sh)
 554 {
 555         struct mlx5_aso_age_mng *mng = sh->aso_age_mng;
 556         struct mlx5_aso_sq *sq = &mng->aso_sq;
 557         struct mlx5_aso_cq *cq = &sq->cq;
 558         volatile struct mlx5_cqe *restrict cqe;
 559         const unsigned int cq_size = 1 << cq->log_desc_n;
 560         const unsigned int mask = cq_size - 1;
 561         uint32_t idx;
 562         uint32_t next_idx = cq->cq_ci & mask;
 563         const uint16_t max = (uint16_t)(sq->pi - sq->ci);
 564         uint16_t i = 0;
 565         int ret;
 566         if (unlikely(!max))
 567                 return 0;
 568         do {
 569                 idx = next_idx;
 570                 next_idx = (cq->cq_ci + 1) & mask;
 571                 rte_prefetch0(&cq->cqes[next_idx]);
 572                 cqe = &cq->cqes[idx];
 573                 ret = check_cqe(cqe, cq_size, cq->cq_ci);
 574                 /*
 575                  * Be sure owner read is done before any other cookie field or
 576                  * opaque field.
 577                  */
 578                 rte_io_rmb();
 579                 if (unlikely(ret != MLX5_CQE_STATUS_SW_OWN)) {
 580                         if (likely(ret == MLX5_CQE_STATUS_HW_OWN))
 581                                 break;
 582                         mlx5_aso_cqe_err_handle(sq);
 583                 } else {
 584                         i += sq->elts[(sq->ci + i) & mask].burst_size;
 585                 }
 586                 cq->cq_ci++;
 587         } while (1);
 588         if (likely(i)) {
 589                 mlx5_aso_age_action_update(sh, i);
 590                 sq->ci += i;
 591                 rte_io_wmb();
 592                 cq->db_rec[0] = rte_cpu_to_be_32(cq->cq_ci);
 593         }
 594         return i;
 595 }
 596
 597 /**
 598  * Periodically read CQEs and send WQEs to ASO SQ.
 599  *
 600  * @param[in] arg
 601  *   Shared device context containing the ASO SQ.
 602  */
 603 static void
 604 mlx5_flow_aso_alarm(void *arg)
 605 {
 606         struct mlx5_dev_ctx_shared *sh = arg;
 607         struct mlx5_aso_sq *sq = &sh->aso_age_mng->aso_sq;
 608         uint32_t us = 100u;
 609         uint16_t n;
 610
 611         rte_spinlock_lock(&sh->aso_age_mng->resize_sl);
 612         n = sh->aso_age_mng->next;
 613         rte_spinlock_unlock(&sh->aso_age_mng->resize_sl);
 614         mlx5_aso_completion_handle(sh);
 615         if (sq->next == n) {
 616                 /* End of loop: wait 1 second. */
 617                 us = US_PER_S;
 618                 sq->next = 0;
 619         }
 620         mlx5_aso_sq_enqueue_burst(sh->aso_age_mng, n);
 621         if (rte_eal_alarm_set(us, mlx5_flow_aso_alarm, sh))
 622                 DRV_LOG(ERR, "Cannot reinitialize aso alarm.");
 623 }
 624
 625 /**
 626  * API to start ASO access using ASO SQ.
 627  *
 628  * @param[in] sh
 629  *   Pointer to shared device context.
 630  *
 631  * @return
 632  *   0 on success, a negative errno value otherwise and rte_errno is set.
 633  */
 634 int
 635 mlx5_aso_queue_start(struct mlx5_dev_ctx_shared *sh)
 636 {
 637         if (rte_eal_alarm_set(US_PER_S, mlx5_flow_aso_alarm, sh)) {
 638                 DRV_LOG(ERR, "Cannot reinitialize ASO age alarm.");
 639                 return -rte_errno;
 640         }
 641         return 0;
 642 }
 643
 644 /**
 645  * API to stop ASO access using ASO SQ.
 646  *
 647  * @param[in] sh
 648  *   Pointer to shared device context.
 649  *
 650  * @return
 651  *   0 on success, a negative errno value otherwise and rte_errno is set.
 652  */
 653 int
 654 mlx5_aso_queue_stop(struct mlx5_dev_ctx_shared *sh)
 655 {
 656         int retries = 1024;
 657
 658         if (!sh->aso_age_mng->aso_sq.sq)
 659                 return -EINVAL;
 660         rte_errno = 0;
 661         while (--retries) {
 662                 rte_eal_alarm_cancel(mlx5_flow_aso_alarm, sh);
 663                 if (rte_errno != EINPROGRESS)
 664                         break;
 665                 rte_pause();
 666         }
 667         return -rte_errno;
 668 }