drivers/regex/mlx5/mlx5_regex_fastpath.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2020 Mellanox Technologies, Ltd
   3  */
   4
   5 #include <unistd.h>
   6 #include <strings.h>
   7 #include <stdint.h>
   8 #include <sys/mman.h>
   9
  10 #include <rte_malloc.h>
  11 #include <rte_log.h>
  12 #include <rte_errno.h>
  13 #include <rte_bus_pci.h>
  14 #include <rte_pci.h>
  15 #include <rte_regexdev_driver.h>
  16 #include <rte_mbuf.h>
  17
  18 #include <infiniband/mlx5dv.h>
  19 #include <mlx5_glue.h>
  20 #include <mlx5_common.h>
  21 #include <mlx5_prm.h>
  22
  23 #include "mlx5_regex_utils.h"
  24 #include "mlx5_rxp.h"
  25 #include "mlx5_regex.h"
  26
  27 #define MLX5_REGEX_MAX_WQE_INDEX 0xffff
  28 #define MLX5_REGEX_METADATA_SIZE UINT32_C(64)
  29 #define MLX5_REGEX_MAX_OUTPUT RTE_BIT32(11)
  30 #define MLX5_REGEX_WQE_CTRL_OFFSET 12
  31 #define MLX5_REGEX_WQE_METADATA_OFFSET 16
  32 #define MLX5_REGEX_WQE_GATHER_OFFSET 32
  33 #define MLX5_REGEX_WQE_SCATTER_OFFSET 48
  34 #define MLX5_REGEX_METADATA_OFF 32
  35
  36 static inline uint32_t
  37 sq_size_get(struct mlx5_regex_sq *sq)
  38 {
  39         return (1U << sq->log_nb_desc);
  40 }
  41
  42 static inline uint32_t
  43 cq_size_get(struct mlx5_regex_cq *cq)
  44 {
  45         return (1U << cq->log_nb_desc);
  46 }
  47
  48 struct mlx5_regex_job {
  49         uint64_t user_id;
  50         volatile uint8_t *output;
  51         volatile uint8_t *metadata;
  52 } __rte_cached_aligned;
  53
  54 static inline void
  55 set_data_seg(struct mlx5_wqe_data_seg *seg,
  56              uint32_t length, uint32_t lkey,
  57              uintptr_t address)
  58 {
  59         seg->byte_count = rte_cpu_to_be_32(length);
  60         seg->lkey = rte_cpu_to_be_32(lkey);
  61         seg->addr = rte_cpu_to_be_64(address);
  62 }
  63
  64 static inline void
  65 set_metadata_seg(struct mlx5_wqe_metadata_seg *seg,
  66                  uint32_t mmo_control_31_0, uint32_t lkey,
  67                  uintptr_t address)
  68 {
  69         seg->mmo_control_31_0 = htobe32(mmo_control_31_0);
  70         seg->lkey = rte_cpu_to_be_32(lkey);
  71         seg->addr = rte_cpu_to_be_64(address);
  72 }
  73
  74 static inline void
  75 set_regex_ctrl_seg(void *seg, uint8_t le, uint16_t subset_id0,
  76                    uint16_t subset_id1, uint16_t subset_id2,
  77                    uint16_t subset_id3, uint8_t ctrl)
  78 {
  79         MLX5_SET(regexp_mmo_control, seg, le, le);
  80         MLX5_SET(regexp_mmo_control, seg, ctrl, ctrl);
  81         MLX5_SET(regexp_mmo_control, seg, subset_id_0, subset_id0);
  82         MLX5_SET(regexp_mmo_control, seg, subset_id_1, subset_id1);
  83         MLX5_SET(regexp_mmo_control, seg, subset_id_2, subset_id2);
  84         MLX5_SET(regexp_mmo_control, seg, subset_id_3, subset_id3);
  85 }
  86
  87 static inline void
  88 set_wqe_ctrl_seg(struct mlx5_wqe_ctrl_seg *seg, uint16_t pi, uint8_t opcode,
  89                  uint8_t opmod, uint32_t qp_num, uint8_t fm_ce_se, uint8_t ds,
  90                  uint8_t signature, uint32_t imm)
  91 {
  92         seg->opmod_idx_opcode = rte_cpu_to_be_32(((uint32_t)opmod << 24) |
  93                                                  ((uint32_t)pi << 8) |
  94                                                  opcode);
  95         seg->qpn_ds = rte_cpu_to_be_32((qp_num << 8) | ds);
  96         seg->fm_ce_se = fm_ce_se;
  97         seg->signature = signature;
  98         seg->imm = imm;
  99 }
 100
 101 static inline void
 102 prep_one(struct mlx5_regex_priv *priv, struct mlx5_regex_qp *qp,
 103          struct mlx5_regex_sq *sq, struct rte_regex_ops *op,
 104          struct mlx5_regex_job *job)
 105 {
 106         size_t wqe_offset = (sq->pi & (sq_size_get(sq) - 1)) * MLX5_SEND_WQE_BB;
 107         uint32_t lkey;
 108         uint16_t group0 = op->req_flags & RTE_REGEX_OPS_REQ_GROUP_ID0_VALID_F ?
 109                                 op->group_id0 : 0;
 110         uint16_t group1 = op->req_flags & RTE_REGEX_OPS_REQ_GROUP_ID1_VALID_F ?
 111                                 op->group_id1 : 0;
 112         uint16_t group2 = op->req_flags & RTE_REGEX_OPS_REQ_GROUP_ID2_VALID_F ?
 113                                 op->group_id2 : 0;
 114         uint16_t group3 = op->req_flags & RTE_REGEX_OPS_REQ_GROUP_ID3_VALID_F ?
 115                                 op->group_id3 : 0;
 116
 117         /* For backward compatibility. */
 118         if (!(op->req_flags & (RTE_REGEX_OPS_REQ_GROUP_ID0_VALID_F |
 119                                RTE_REGEX_OPS_REQ_GROUP_ID1_VALID_F |
 120                                RTE_REGEX_OPS_REQ_GROUP_ID2_VALID_F |
 121                                RTE_REGEX_OPS_REQ_GROUP_ID3_VALID_F)))
 122                 group0 = op->group_id0;
 123         lkey = mlx5_mr_addr2mr_bh(priv->pd, 0,
 124                                   &priv->mr_scache, &qp->mr_ctrl,
 125                                   rte_pktmbuf_mtod(op->mbuf, uintptr_t),
 126                                   !!(op->mbuf->ol_flags & EXT_ATTACHED_MBUF));
 127         uint8_t *wqe = (uint8_t *)(uintptr_t)sq->sq_obj.wqes + wqe_offset;
 128         int ds = 4; /*  ctrl + meta + input + output */
 129
 130         set_wqe_ctrl_seg((struct mlx5_wqe_ctrl_seg *)wqe, sq->pi,
 131                          MLX5_OPCODE_MMO, MLX5_OPC_MOD_MMO_REGEX,
 132                          sq->sq_obj.sq->id, 0, ds, 0, 0);
 133         set_regex_ctrl_seg(wqe + 12, 0, group0, group1, group2, group3,
 134                            0);
 135         struct mlx5_wqe_data_seg *input_seg =
 136                 (struct mlx5_wqe_data_seg *)(wqe +
 137                                              MLX5_REGEX_WQE_GATHER_OFFSET);
 138         input_seg->byte_count =
 139                 rte_cpu_to_be_32(rte_pktmbuf_data_len(op->mbuf));
 140         input_seg->addr = rte_cpu_to_be_64(rte_pktmbuf_mtod(op->mbuf,
 141                                                             uintptr_t));
 142         input_seg->lkey = lkey;
 143         job->user_id = op->user_id;
 144         sq->db_pi = sq->pi;
 145         sq->pi = (sq->pi + 1) & MLX5_REGEX_MAX_WQE_INDEX;
 146 }
 147
 148 static inline void
 149 send_doorbell(struct mlx5dv_devx_uar *uar, struct mlx5_regex_sq *sq)
 150 {
 151         size_t wqe_offset = (sq->db_pi & (sq_size_get(sq) - 1)) *
 152                 MLX5_SEND_WQE_BB;
 153         uint8_t *wqe = (uint8_t *)(uintptr_t)sq->sq_obj.wqes + wqe_offset;
 154         ((struct mlx5_wqe_ctrl_seg *)wqe)->fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE;
 155         uint64_t *doorbell_addr =
 156                 (uint64_t *)((uint8_t *)uar->base_addr + 0x800);
 157         rte_io_wmb();
 158         sq->sq_obj.db_rec[MLX5_SND_DBR] = rte_cpu_to_be_32((sq->db_pi + 1) &
 159                                                  MLX5_REGEX_MAX_WQE_INDEX);
 160         rte_wmb();
 161         *doorbell_addr = *(volatile uint64_t *)wqe;
 162         rte_wmb();
 163 }
 164
 165 static inline int
 166 can_send(struct mlx5_regex_sq *sq) {
 167         return ((uint16_t)(sq->pi - sq->ci) < sq_size_get(sq));
 168 }
 169
 170 static inline uint32_t
 171 job_id_get(uint32_t qid, size_t sq_size, size_t index) {
 172         return qid * sq_size + (index & (sq_size - 1));
 173 }
 174
 175 uint16_t
 176 mlx5_regexdev_enqueue(struct rte_regexdev *dev, uint16_t qp_id,
 177                       struct rte_regex_ops **ops, uint16_t nb_ops)
 178 {
 179         struct mlx5_regex_priv *priv = dev->data->dev_private;
 180         struct mlx5_regex_qp *queue = &priv->qps[qp_id];
 181         struct mlx5_regex_sq *sq;
 182         size_t sqid, job_id, i = 0;
 183
 184         while ((sqid = ffs(queue->free_sqs))) {
 185                 sqid--; /* ffs returns 1 for bit 0 */
 186                 sq = &queue->sqs[sqid];
 187                 while (can_send(sq)) {
 188                         job_id = job_id_get(sqid, sq_size_get(sq), sq->pi);
 189                         prep_one(priv, queue, sq, ops[i], &queue->jobs[job_id]);
 190                         i++;
 191                         if (unlikely(i == nb_ops)) {
 192                                 send_doorbell(priv->uar, sq);
 193                                 goto out;
 194                         }
 195                 }
 196                 queue->free_sqs &= ~(1 << sqid);
 197                 send_doorbell(priv->uar, sq);
 198         }
 199
 200 out:
 201         queue->pi += i;
 202         return i;
 203 }
 204
 205 #define MLX5_REGEX_RESP_SZ 8
 206
 207 static inline void
 208 extract_result(struct rte_regex_ops *op, struct mlx5_regex_job *job)
 209 {
 210         size_t j;
 211         size_t offset;
 212         uint16_t status;
 213
 214         op->user_id = job->user_id;
 215         op->nb_matches = MLX5_GET_VOLATILE(regexp_metadata, job->metadata +
 216                                            MLX5_REGEX_METADATA_OFF,
 217                                            match_count);
 218         op->nb_actual_matches = MLX5_GET_VOLATILE(regexp_metadata,
 219                                                   job->metadata +
 220                                                   MLX5_REGEX_METADATA_OFF,
 221                                                   detected_match_count);
 222         for (j = 0; j < op->nb_matches; j++) {
 223                 offset = MLX5_REGEX_RESP_SZ * j;
 224                 op->matches[j].rule_id =
 225                         MLX5_GET_VOLATILE(regexp_match_tuple,
 226                                           (job->output + offset), rule_id);
 227                 op->matches[j].start_offset =
 228                         MLX5_GET_VOLATILE(regexp_match_tuple,
 229                                           (job->output +  offset), start_ptr);
 230                 op->matches[j].len =
 231                         MLX5_GET_VOLATILE(regexp_match_tuple,
 232                                           (job->output +  offset), length);
 233         }
 234         status = MLX5_GET_VOLATILE(regexp_metadata, job->metadata +
 235                                    MLX5_REGEX_METADATA_OFF,
 236                                    status);
 237         op->rsp_flags = 0;
 238         if (status & MLX5_RXP_RESP_STATUS_PMI_SOJ)
 239                 op->rsp_flags |= RTE_REGEX_OPS_RSP_PMI_SOJ_F;
 240         if (status & MLX5_RXP_RESP_STATUS_PMI_EOJ)
 241                 op->rsp_flags |= RTE_REGEX_OPS_RSP_PMI_EOJ_F;
 242         if (status & MLX5_RXP_RESP_STATUS_MAX_LATENCY)
 243                 op->rsp_flags |= RTE_REGEX_OPS_RSP_MAX_SCAN_TIMEOUT_F;
 244         if (status & MLX5_RXP_RESP_STATUS_MAX_MATCH)
 245                 op->rsp_flags |= RTE_REGEX_OPS_RSP_MAX_MATCH_F;
 246         if (status & MLX5_RXP_RESP_STATUS_MAX_PREFIX)
 247                 op->rsp_flags |= RTE_REGEX_OPS_RSP_MAX_PREFIX_F;
 248         if (status & MLX5_RXP_RESP_STATUS_MAX_PRI_THREADS)
 249                 op->rsp_flags |= RTE_REGEX_OPS_RSP_RESOURCE_LIMIT_REACHED_F;
 250         if (status & MLX5_RXP_RESP_STATUS_MAX_SEC_THREADS)
 251                 op->rsp_flags |= RTE_REGEX_OPS_RSP_RESOURCE_LIMIT_REACHED_F;
 252 }
 253
 254 static inline volatile struct mlx5_cqe *
 255 poll_one(struct mlx5_regex_cq *cq)
 256 {
 257         volatile struct mlx5_cqe *cqe;
 258         size_t next_cqe_offset;
 259
 260         next_cqe_offset =  (cq->ci & (cq_size_get(cq) - 1));
 261         cqe = (volatile struct mlx5_cqe *)(cq->cq_obj.cqes + next_cqe_offset);
 262         rte_io_wmb();
 263
 264         int ret = check_cqe(cqe, cq_size_get(cq), cq->ci);
 265
 266         if (unlikely(ret == MLX5_CQE_STATUS_ERR)) {
 267                 DRV_LOG(ERR, "Completion with error on qp 0x%x",  0);
 268                 return NULL;
 269         }
 270
 271         if (unlikely(ret != MLX5_CQE_STATUS_SW_OWN))
 272                 return NULL;
 273
 274         return cqe;
 275 }
 276
 277
 278 /**
 279  * DPDK callback for dequeue.
 280  *
 281  * @param dev
 282  *   Pointer to the regex dev structure.
 283  * @param qp_id
 284  *   The queue to enqueue the traffic to.
 285  * @param ops
 286  *   List of regex ops to dequeue.
 287  * @param nb_ops
 288  *   Number of ops in ops parameter.
 289  *
 290  * @return
 291  *   Number of packets successfully dequeued (<= pkts_n).
 292  */
 293 uint16_t
 294 mlx5_regexdev_dequeue(struct rte_regexdev *dev, uint16_t qp_id,
 295                       struct rte_regex_ops **ops, uint16_t nb_ops)
 296 {
 297         struct mlx5_regex_priv *priv = dev->data->dev_private;
 298         struct mlx5_regex_qp *queue = &priv->qps[qp_id];
 299         struct mlx5_regex_cq *cq = &queue->cq;
 300         volatile struct mlx5_cqe *cqe;
 301         size_t i = 0;
 302
 303         while ((cqe = poll_one(cq))) {
 304                 uint16_t wq_counter
 305                         = (rte_be_to_cpu_16(cqe->wqe_counter) + 1) &
 306                           MLX5_REGEX_MAX_WQE_INDEX;
 307                 size_t sqid = cqe->rsvd3[2];
 308                 struct mlx5_regex_sq *sq = &queue->sqs[sqid];
 309                 while (sq->ci != wq_counter) {
 310                         if (unlikely(i == nb_ops)) {
 311                                 /* Return without updating cq->ci */
 312                                 goto out;
 313                         }
 314                         uint32_t job_id = job_id_get(sqid, sq_size_get(sq),
 315                                                      sq->ci);
 316                         extract_result(ops[i], &queue->jobs[job_id]);
 317                         sq->ci = (sq->ci + 1) & MLX5_REGEX_MAX_WQE_INDEX;
 318                         i++;
 319                 }
 320                 cq->ci = (cq->ci + 1) & 0xffffff;
 321                 rte_wmb();
 322                 cq->cq_obj.db_rec[0] = rte_cpu_to_be_32(cq->ci);
 323                 queue->free_sqs |= (1 << sqid);
 324         }
 325
 326 out:
 327         queue->ci += i;
 328         return i;
 329 }
 330
 331 static void
 332 setup_sqs(struct mlx5_regex_qp *queue)
 333 {
 334         size_t sqid, entry;
 335         uint32_t job_id;
 336         for (sqid = 0; sqid < queue->nb_obj; sqid++) {
 337                 struct mlx5_regex_sq *sq = &queue->sqs[sqid];
 338                 uint8_t *wqe = (uint8_t *)(uintptr_t)sq->sq_obj.wqes;
 339                 for (entry = 0 ; entry < sq_size_get(sq); entry++) {
 340                         job_id = sqid * sq_size_get(sq) + entry;
 341                         struct mlx5_regex_job *job = &queue->jobs[job_id];
 342
 343                         set_metadata_seg((struct mlx5_wqe_metadata_seg *)
 344                                          (wqe + MLX5_REGEX_WQE_METADATA_OFFSET),
 345                                          0, queue->metadata->lkey,
 346                                          (uintptr_t)job->metadata);
 347                         set_data_seg((struct mlx5_wqe_data_seg *)
 348                                      (wqe + MLX5_REGEX_WQE_SCATTER_OFFSET),
 349                                      MLX5_REGEX_MAX_OUTPUT,
 350                                      queue->outputs->lkey,
 351                                      (uintptr_t)job->output);
 352                         wqe += 64;
 353                 }
 354                 queue->free_sqs |= 1 << sqid;
 355         }
 356 }
 357
 358 static int
 359 setup_buffers(struct mlx5_regex_qp *qp, struct ibv_pd *pd)
 360 {
 361         uint32_t i;
 362         int err;
 363
 364         void *ptr = rte_calloc(__func__, qp->nb_desc,
 365                                MLX5_REGEX_METADATA_SIZE,
 366                                MLX5_REGEX_METADATA_SIZE);
 367         if (!ptr)
 368                 return -ENOMEM;
 369
 370         qp->metadata = mlx5_glue->reg_mr(pd, ptr,
 371                                          MLX5_REGEX_METADATA_SIZE * qp->nb_desc,
 372                                          IBV_ACCESS_LOCAL_WRITE);
 373         if (!qp->metadata) {
 374                 DRV_LOG(ERR, "Failed to register metadata");
 375                 rte_free(ptr);
 376                 return -EINVAL;
 377         }
 378
 379         ptr = rte_calloc(__func__, qp->nb_desc,
 380                          MLX5_REGEX_MAX_OUTPUT,
 381                          MLX5_REGEX_MAX_OUTPUT);
 382         if (!ptr) {
 383                 err = -ENOMEM;
 384                 goto err_output;
 385         }
 386         qp->outputs = mlx5_glue->reg_mr(pd, ptr,
 387                                         MLX5_REGEX_MAX_OUTPUT * qp->nb_desc,
 388                                         IBV_ACCESS_LOCAL_WRITE);
 389         if (!qp->outputs) {
 390                 rte_free(ptr);
 391                 DRV_LOG(ERR, "Failed to register output");
 392                 err = -EINVAL;
 393                 goto err_output;
 394         }
 395
 396         /* distribute buffers to jobs */
 397         for (i = 0; i < qp->nb_desc; i++) {
 398                 qp->jobs[i].output =
 399                         (uint8_t *)qp->outputs->addr +
 400                         (i % qp->nb_desc) * MLX5_REGEX_MAX_OUTPUT;
 401                 qp->jobs[i].metadata =
 402                         (uint8_t *)qp->metadata->addr +
 403                         (i % qp->nb_desc) * MLX5_REGEX_METADATA_SIZE;
 404         }
 405         return 0;
 406
 407 err_output:
 408         ptr = qp->metadata->addr;
 409         rte_free(ptr);
 410         mlx5_glue->dereg_mr(qp->metadata);
 411         return err;
 412 }
 413
 414 int
 415 mlx5_regexdev_setup_fastpath(struct mlx5_regex_priv *priv, uint32_t qp_id)
 416 {
 417         struct mlx5_regex_qp *qp = &priv->qps[qp_id];
 418         int err;
 419
 420         qp->jobs = rte_calloc(__func__, qp->nb_desc, sizeof(*qp->jobs), 64);
 421         if (!qp->jobs)
 422                 return -ENOMEM;
 423         err = setup_buffers(qp, priv->pd);
 424         if (err) {
 425                 rte_free(qp->jobs);
 426                 return err;
 427         }
 428         setup_sqs(qp);
 429         return 0;
 430 }
 431
 432 static void
 433 free_buffers(struct mlx5_regex_qp *qp)
 434 {
 435         if (qp->metadata) {
 436                 mlx5_glue->dereg_mr(qp->metadata);
 437                 rte_free(qp->metadata->addr);
 438         }
 439         if (qp->outputs) {
 440                 mlx5_glue->dereg_mr(qp->outputs);
 441                 rte_free(qp->outputs->addr);
 442         }
 443 }
 444
 445 void
 446 mlx5_regexdev_teardown_fastpath(struct mlx5_regex_priv *priv, uint32_t qp_id)
 447 {
 448         struct mlx5_regex_qp *qp = &priv->qps[qp_id];
 449
 450         if (qp) {
 451                 free_buffers(qp);
 452                 if (qp->jobs)
 453                         rte_free(qp->jobs);
 454         }
 455 }