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 <sys/mman.h>
   7
   8 #include <rte_malloc.h>
   9 #include <rte_log.h>
  10 #include <rte_errno.h>
  11 #include <rte_bus_pci.h>
  12 #include <rte_pci.h>
  13 #include <rte_regexdev_driver.h>
  14 #include <rte_mbuf.h>
  15
  16 #include <infiniband/mlx5dv.h>
  17 #include <mlx5_glue.h>
  18 #include <mlx5_common.h>
  19 #include <mlx5_prm.h>
  20 #include <strings.h>
  21
  22 #include "mlx5_regex_utils.h"
  23 #include "mlx5_rxp.h"
  24 #include "mlx5_regex.h"
  25
  26 #define MLX5_REGEX_MAX_WQE_INDEX 0xffff
  27 #define MLX5_REGEX_METADATA_SIZE 64
  28 #define MLX5_REGEX_MAX_INPUT (1 << 14)
  29 #define MLX5_REGEX_MAX_OUTPUT (1 << 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         uint8_t *input;
  51         volatile uint8_t *output;
  52         volatile uint8_t *metadata;
  53 } __rte_cached_aligned;
  54
  55 static inline void
  56 set_data_seg(struct mlx5_wqe_data_seg *seg,
  57              uint32_t length, uint32_t lkey,
  58              uintptr_t address)
  59 {
  60         seg->byte_count = rte_cpu_to_be_32(length);
  61         seg->lkey = rte_cpu_to_be_32(lkey);
  62         seg->addr = rte_cpu_to_be_64(address);
  63 }
  64
  65 static inline void
  66 set_metadata_seg(struct mlx5_wqe_metadata_seg *seg,
  67                  uint32_t mmo_control_31_0, uint32_t lkey,
  68                  uintptr_t address)
  69 {
  70         seg->mmo_control_31_0 = htobe32(mmo_control_31_0);
  71         seg->lkey = rte_cpu_to_be_32(lkey);
  72         seg->addr = rte_cpu_to_be_64(address);
  73 }
  74
  75 static inline void
  76 set_regex_ctrl_seg(void *seg, uint8_t le, uint16_t subset_id0,
  77                    uint16_t subset_id1, uint16_t subset_id2,
  78                    uint16_t subset_id3, uint8_t ctrl)
  79 {
  80         MLX5_SET(regexp_mmo_control, seg, le, le);
  81         MLX5_SET(regexp_mmo_control, seg, ctrl, ctrl);
  82         MLX5_SET(regexp_mmo_control, seg, subset_id_0, subset_id0);
  83         MLX5_SET(regexp_mmo_control, seg, subset_id_1, subset_id1);
  84         MLX5_SET(regexp_mmo_control, seg, subset_id_2, subset_id2);
  85         MLX5_SET(regexp_mmo_control, seg, subset_id_3, subset_id3);
  86 }
  87
  88 static inline void
  89 set_wqe_ctrl_seg(struct mlx5_wqe_ctrl_seg *seg, uint16_t pi, uint8_t opcode,
  90                  uint8_t opmod, uint32_t qp_num, uint8_t fm_ce_se, uint8_t ds,
  91                  uint8_t signature, uint32_t imm)
  92 {
  93         seg->opmod_idx_opcode = rte_cpu_to_be_32(((uint32_t)opmod << 24) |
  94                                                  ((uint32_t)pi << 8) |
  95                                                  opcode);
  96         seg->qpn_ds = rte_cpu_to_be_32((qp_num << 8) | ds);
  97         seg->fm_ce_se = fm_ce_se;
  98         seg->signature = signature;
  99         seg->imm = imm;
 100 }
 101
 102 static inline void
 103 prep_one(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         uint8_t *wqe = (uint8_t *)sq->wqe + wqe_offset;
 108         int ds = 4; /*  ctrl + meta + input + output */
 109
 110         memcpy(job->input,
 111                 rte_pktmbuf_mtod(op->mbuf, void *),
 112                 rte_pktmbuf_data_len(op->mbuf));
 113         set_wqe_ctrl_seg((struct mlx5_wqe_ctrl_seg *)wqe, sq->pi,
 114                          MLX5_OPCODE_MMO, MLX5_OPC_MOD_MMO_REGEX, sq->obj->id,
 115                          0, ds, 0, 0);
 116         set_regex_ctrl_seg(wqe + 12, 0, op->group_id0, op->group_id1,
 117                            op->group_id2,
 118                            op->group_id3, 0);
 119         struct mlx5_wqe_data_seg *input_seg =
 120                 (struct mlx5_wqe_data_seg *)(wqe +
 121                                              MLX5_REGEX_WQE_GATHER_OFFSET);
 122         input_seg->byte_count =
 123                 rte_cpu_to_be_32(rte_pktmbuf_data_len(op->mbuf));
 124         job->user_id = op->user_id;
 125         sq->db_pi = sq->pi;
 126         sq->pi = (sq->pi + 1) & MLX5_REGEX_MAX_WQE_INDEX;
 127 }
 128
 129 static inline void
 130 send_doorbell(struct mlx5dv_devx_uar *uar, struct mlx5_regex_sq *sq)
 131 {
 132         size_t wqe_offset = (sq->db_pi & (sq_size_get(sq) - 1)) *
 133                 MLX5_SEND_WQE_BB;
 134         uint8_t *wqe = (uint8_t *)sq->wqe + wqe_offset;
 135         ((struct mlx5_wqe_ctrl_seg *)wqe)->fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE;
 136         uint64_t *doorbell_addr =
 137                 (uint64_t *)((uint8_t *)uar->base_addr + 0x800);
 138         rte_cio_wmb();
 139         sq->dbr[MLX5_SND_DBR] = rte_cpu_to_be_32((sq->db_pi + 1) &
 140                                                  MLX5_REGEX_MAX_WQE_INDEX);
 141         rte_wmb();
 142         *doorbell_addr = *(volatile uint64_t *)wqe;
 143         rte_wmb();
 144 }
 145
 146 static inline int
 147 can_send(struct mlx5_regex_sq *sq) {
 148         return ((uint16_t)(sq->pi - sq->ci) < sq_size_get(sq));
 149 }
 150
 151 static inline uint32_t
 152 job_id_get(uint32_t qid, size_t sq_size, size_t index) {
 153         return qid * sq_size + (index & (sq_size - 1));
 154 }
 155
 156 uint16_t
 157 mlx5_regexdev_enqueue(struct rte_regexdev *dev, uint16_t qp_id,
 158                       struct rte_regex_ops **ops, uint16_t nb_ops)
 159 {
 160         struct mlx5_regex_priv *priv = dev->data->dev_private;
 161         struct mlx5_regex_qp *queue = &priv->qps[qp_id];
 162         struct mlx5_regex_sq *sq;
 163         size_t sqid, job_id, i = 0;
 164
 165         while ((sqid = ffs(queue->free_sqs))) {
 166                 sqid--; /* ffs returns 1 for bit 0 */
 167                 sq = &queue->sqs[sqid];
 168                 while (can_send(sq)) {
 169                         job_id = job_id_get(sqid, sq_size_get(sq), sq->pi);
 170                         prep_one(sq, ops[i], &queue->jobs[job_id]);
 171                         i++;
 172                         if (unlikely(i == nb_ops)) {
 173                                 send_doorbell(priv->uar, sq);
 174                                 goto out;
 175                         }
 176                 }
 177                 queue->free_sqs &= ~(1 << sqid);
 178                 send_doorbell(priv->uar, sq);
 179         }
 180
 181 out:
 182         queue->pi += i;
 183         return i;
 184 }
 185
 186 #define MLX5_REGEX_RESP_SZ 8
 187
 188 static inline void
 189 extract_result(struct rte_regex_ops *op, struct mlx5_regex_job *job)
 190 {
 191         size_t j, offset;
 192         op->user_id = job->user_id;
 193         op->nb_matches = MLX5_GET_VOLATILE(regexp_metadata, job->metadata +
 194                                            MLX5_REGEX_METADATA_OFF,
 195                                            match_count);
 196         op->nb_actual_matches = MLX5_GET_VOLATILE(regexp_metadata,
 197                                                   job->metadata +
 198                                                   MLX5_REGEX_METADATA_OFF,
 199                                                   detected_match_count);
 200         for (j = 0; j < op->nb_matches; j++) {
 201                 offset = MLX5_REGEX_RESP_SZ * j;
 202                 op->matches[j].rule_id =
 203                         MLX5_GET_VOLATILE(regexp_match_tuple,
 204                                           (job->output + offset), rule_id);
 205                 op->matches[j].start_offset =
 206                         MLX5_GET_VOLATILE(regexp_match_tuple,
 207                                           (job->output +  offset), start_ptr);
 208                 op->matches[j].len =
 209                         MLX5_GET_VOLATILE(regexp_match_tuple,
 210                                           (job->output +  offset), length);
 211         }
 212 }
 213
 214 static inline volatile struct mlx5_cqe *
 215 poll_one(struct mlx5_regex_cq *cq)
 216 {
 217         volatile struct mlx5_cqe *cqe;
 218         size_t next_cqe_offset;
 219
 220         next_cqe_offset =  (cq->ci & (cq_size_get(cq) - 1));
 221         cqe = (volatile struct mlx5_cqe *)(cq->cqe + next_cqe_offset);
 222         rte_cio_wmb();
 223
 224         int ret = check_cqe(cqe, cq_size_get(cq), cq->ci);
 225
 226         if (unlikely(ret == MLX5_CQE_STATUS_ERR)) {
 227                 DRV_LOG(ERR, "Completion with error on qp 0x%x",  0);
 228                 return NULL;
 229         }
 230
 231         if (unlikely(ret != MLX5_CQE_STATUS_SW_OWN))
 232                 return NULL;
 233
 234         return cqe;
 235 }
 236
 237
 238 /**
 239  * DPDK callback for dequeue.
 240  *
 241  * @param dev
 242  *   Pointer to the regex dev structure.
 243  * @param qp_id
 244  *   The queue to enqueue the traffic to.
 245  * @param ops
 246  *   List of regex ops to dequeue.
 247  * @param nb_ops
 248  *   Number of ops in ops parameter.
 249  *
 250  * @return
 251  *   Number of packets successfully dequeued (<= pkts_n).
 252  */
 253 uint16_t
 254 mlx5_regexdev_dequeue(struct rte_regexdev *dev, uint16_t qp_id,
 255                       struct rte_regex_ops **ops, uint16_t nb_ops)
 256 {
 257         struct mlx5_regex_priv *priv = dev->data->dev_private;
 258         struct mlx5_regex_qp *queue = &priv->qps[qp_id];
 259         struct mlx5_regex_cq *cq = &queue->cq;
 260         volatile struct mlx5_cqe *cqe;
 261         size_t i = 0;
 262
 263         while ((cqe = poll_one(cq))) {
 264                 uint16_t wq_counter
 265                         = (rte_be_to_cpu_16(cqe->wqe_counter) + 1) &
 266                           MLX5_REGEX_MAX_WQE_INDEX;
 267                 size_t sqid = cqe->rsvd3[2];
 268                 struct mlx5_regex_sq *sq = &queue->sqs[sqid];
 269                 while (sq->ci != wq_counter) {
 270                         if (unlikely(i == nb_ops)) {
 271                                 /* Return without updating cq->ci */
 272                                 goto out;
 273                         }
 274                         uint32_t job_id = job_id_get(sqid, sq_size_get(sq),
 275                                                      sq->ci);
 276                         extract_result(ops[i], &queue->jobs[job_id]);
 277                         sq->ci = (sq->ci + 1) & MLX5_REGEX_MAX_WQE_INDEX;
 278                         i++;
 279                 }
 280                 cq->ci = (cq->ci + 1) & 0xffffff;
 281                 rte_wmb();
 282                 cq->dbr[0] = rte_cpu_to_be_32(cq->ci);
 283                 queue->free_sqs |= (1 << sqid);
 284         }
 285
 286 out:
 287         queue->ci += i;
 288         return i;
 289 }
 290
 291 static void
 292 setup_sqs(struct mlx5_regex_qp *queue)
 293 {
 294         size_t sqid, entry;
 295         uint32_t job_id;
 296         for (sqid = 0; sqid < queue->nb_obj; sqid++) {
 297                 struct mlx5_regex_sq *sq = &queue->sqs[sqid];
 298                 uint8_t *wqe = (uint8_t *)sq->wqe;
 299                 for (entry = 0 ; entry < sq_size_get(sq); entry++) {
 300                         job_id = sqid * sq_size_get(sq) + entry;
 301                         struct mlx5_regex_job *job = &queue->jobs[job_id];
 302
 303                         set_metadata_seg((struct mlx5_wqe_metadata_seg *)
 304                                          (wqe + MLX5_REGEX_WQE_METADATA_OFFSET),
 305                                          0, queue->metadata->lkey,
 306                                          (uintptr_t)job->metadata);
 307                         set_data_seg((struct mlx5_wqe_data_seg *)
 308                                      (wqe + MLX5_REGEX_WQE_GATHER_OFFSET),
 309                                      0, queue->inputs->lkey,
 310                                      (uintptr_t)job->input);
 311                         set_data_seg((struct mlx5_wqe_data_seg *)
 312                                      (wqe + MLX5_REGEX_WQE_SCATTER_OFFSET),
 313                                      MLX5_REGEX_MAX_OUTPUT,
 314                                      queue->outputs->lkey,
 315                                      (uintptr_t)job->output);
 316                         wqe += 64;
 317                 }
 318                 queue->free_sqs |= 1 << sqid;
 319         }
 320 }
 321
 322 static int
 323 setup_buffers(struct mlx5_regex_qp *qp, struct ibv_pd *pd)
 324 {
 325         uint32_t i;
 326         int err;
 327
 328         void *ptr = rte_calloc(__func__, qp->nb_desc,
 329                                MLX5_REGEX_METADATA_SIZE,
 330                                MLX5_REGEX_METADATA_SIZE);
 331         if (!ptr)
 332                 return -ENOMEM;
 333
 334         qp->metadata = mlx5_glue->reg_mr(pd, ptr,
 335                                          MLX5_REGEX_METADATA_SIZE*qp->nb_desc,
 336                                          IBV_ACCESS_LOCAL_WRITE);
 337         if (!qp->metadata) {
 338                 rte_free(ptr);
 339                 return -EINVAL;
 340         }
 341         ptr = rte_calloc(__func__, qp->nb_desc,
 342                          MLX5_REGEX_MAX_INPUT,
 343                          MLX5_REGEX_MAX_INPUT);
 344
 345         if (!ptr) {
 346                 err = -ENOMEM;
 347                 goto err_input;
 348         }
 349         qp->inputs = mlx5_glue->reg_mr(pd, ptr,
 350                                        MLX5_REGEX_MAX_INPUT*qp->nb_desc,
 351                                        IBV_ACCESS_LOCAL_WRITE);
 352         if (!qp->inputs) {
 353                 rte_free(ptr);
 354                 err = -EINVAL;
 355                 goto err_input;
 356         }
 357
 358         ptr = rte_calloc(__func__, qp->nb_desc,
 359                          MLX5_REGEX_MAX_OUTPUT,
 360                          MLX5_REGEX_MAX_OUTPUT);
 361         if (!ptr) {
 362                 err = -ENOMEM;
 363                 goto err_output;
 364         }
 365         qp->outputs = mlx5_glue->reg_mr(pd, ptr,
 366                                         MLX5_REGEX_MAX_OUTPUT * qp->nb_desc,
 367                                         IBV_ACCESS_LOCAL_WRITE);
 368         if (!qp->outputs) {
 369                 rte_free(ptr);
 370                 err = -EINVAL;
 371                 goto err_output;
 372         }
 373
 374         /* distribute buffers to jobs */
 375         for (i = 0; i < qp->nb_desc; i++) {
 376                 qp->jobs[i].input =
 377                         (uint8_t *)qp->inputs->addr +
 378                         (i % qp->nb_desc) * MLX5_REGEX_MAX_INPUT;
 379                 qp->jobs[i].output =
 380                         (uint8_t *)qp->outputs->addr +
 381                         (i % qp->nb_desc) * MLX5_REGEX_MAX_OUTPUT;
 382                 qp->jobs[i].metadata =
 383                         (uint8_t *)qp->metadata->addr +
 384                         (i % qp->nb_desc) * MLX5_REGEX_METADATA_SIZE;
 385         }
 386         return 0;
 387
 388 err_output:
 389         ptr = qp->inputs->addr;
 390         rte_free(ptr);
 391         mlx5_glue->dereg_mr(qp->inputs);
 392 err_input:
 393         ptr = qp->metadata->addr;
 394         rte_free(ptr);
 395         mlx5_glue->dereg_mr(qp->metadata);
 396         return err;
 397 }
 398
 399 int
 400 mlx5_regexdev_setup_fastpath(struct mlx5_regex_priv *priv, uint32_t qp_id)
 401 {
 402         struct mlx5_regex_qp *qp = &priv->qps[qp_id];
 403         int err;
 404
 405         qp->jobs = rte_calloc(__func__, qp->nb_desc, sizeof(*qp->jobs),
 406                               sizeof(*qp->jobs));
 407         if (!qp->jobs)
 408                 return -ENOMEM;
 409         err = setup_buffers(qp, priv->pd);
 410         if (err)
 411                 return err;
 412         setup_sqs(qp);
 413         return 0;
 414 }