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
 109         lkey = mlx5_mr_addr2mr_bh(priv->pd, 0,
 110                                   &priv->mr_scache, &qp->mr_ctrl,
 111                                   rte_pktmbuf_mtod(op->mbuf, uintptr_t),
 112                                   !!(op->mbuf->ol_flags & EXT_ATTACHED_MBUF));
 113         uint8_t *wqe = (uint8_t *)sq->wqe + wqe_offset;
 114         int ds = 4; /*  ctrl + meta + input + output */
 115
 116         set_wqe_ctrl_seg((struct mlx5_wqe_ctrl_seg *)wqe, sq->pi,
 117                          MLX5_OPCODE_MMO, MLX5_OPC_MOD_MMO_REGEX, sq->obj->id,
 118                          0, ds, 0, 0);
 119         set_regex_ctrl_seg(wqe + 12, 0, op->group_id0, op->group_id1,
 120                            op->group_id2,
 121                            op->group_id3, 0);
 122         struct mlx5_wqe_data_seg *input_seg =
 123                 (struct mlx5_wqe_data_seg *)(wqe +
 124                                              MLX5_REGEX_WQE_GATHER_OFFSET);
 125         input_seg->byte_count =
 126                 rte_cpu_to_be_32(rte_pktmbuf_data_len(op->mbuf));
 127         input_seg->addr = rte_cpu_to_be_64(rte_pktmbuf_mtod(op->mbuf,
 128                                                             uintptr_t));
 129         input_seg->lkey = lkey;
 130         job->user_id = op->user_id;
 131         sq->db_pi = sq->pi;
 132         sq->pi = (sq->pi + 1) & MLX5_REGEX_MAX_WQE_INDEX;
 133 }
 134
 135 static inline void
 136 send_doorbell(struct mlx5dv_devx_uar *uar, struct mlx5_regex_sq *sq)
 137 {
 138         size_t wqe_offset = (sq->db_pi & (sq_size_get(sq) - 1)) *
 139                 MLX5_SEND_WQE_BB;
 140         uint8_t *wqe = (uint8_t *)sq->wqe + wqe_offset;
 141         ((struct mlx5_wqe_ctrl_seg *)wqe)->fm_ce_se = MLX5_WQE_CTRL_CQ_UPDATE;
 142         uint64_t *doorbell_addr =
 143                 (uint64_t *)((uint8_t *)uar->base_addr + 0x800);
 144         rte_io_wmb();
 145         sq->dbr[MLX5_SND_DBR] = rte_cpu_to_be_32((sq->db_pi + 1) &
 146                                                  MLX5_REGEX_MAX_WQE_INDEX);
 147         rte_wmb();
 148         *doorbell_addr = *(volatile uint64_t *)wqe;
 149         rte_wmb();
 150 }
 151
 152 static inline int
 153 can_send(struct mlx5_regex_sq *sq) {
 154         return ((uint16_t)(sq->pi - sq->ci) < sq_size_get(sq));
 155 }
 156
 157 static inline uint32_t
 158 job_id_get(uint32_t qid, size_t sq_size, size_t index) {
 159         return qid * sq_size + (index & (sq_size - 1));
 160 }
 161
 162 uint16_t
 163 mlx5_regexdev_enqueue(struct rte_regexdev *dev, uint16_t qp_id,
 164                       struct rte_regex_ops **ops, uint16_t nb_ops)
 165 {
 166         struct mlx5_regex_priv *priv = dev->data->dev_private;
 167         struct mlx5_regex_qp *queue = &priv->qps[qp_id];
 168         struct mlx5_regex_sq *sq;
 169         size_t sqid, job_id, i = 0;
 170
 171         while ((sqid = ffs(queue->free_sqs))) {
 172                 sqid--; /* ffs returns 1 for bit 0 */
 173                 sq = &queue->sqs[sqid];
 174                 while (can_send(sq)) {
 175                         job_id = job_id_get(sqid, sq_size_get(sq), sq->pi);
 176                         prep_one(priv, queue, sq, ops[i], &queue->jobs[job_id]);
 177                         i++;
 178                         if (unlikely(i == nb_ops)) {
 179                                 send_doorbell(priv->uar, sq);
 180                                 goto out;
 181                         }
 182                 }
 183                 queue->free_sqs &= ~(1 << sqid);
 184                 send_doorbell(priv->uar, sq);
 185         }
 186
 187 out:
 188         queue->pi += i;
 189         return i;
 190 }
 191
 192 #define MLX5_REGEX_RESP_SZ 8
 193
 194 static inline void
 195 extract_result(struct rte_regex_ops *op, struct mlx5_regex_job *job)
 196 {
 197         size_t j, offset;
 198         op->user_id = job->user_id;
 199         op->nb_matches = MLX5_GET_VOLATILE(regexp_metadata, job->metadata +
 200                                            MLX5_REGEX_METADATA_OFF,
 201                                            match_count);
 202         op->nb_actual_matches = MLX5_GET_VOLATILE(regexp_metadata,
 203                                                   job->metadata +
 204                                                   MLX5_REGEX_METADATA_OFF,
 205                                                   detected_match_count);
 206         for (j = 0; j < op->nb_matches; j++) {
 207                 offset = MLX5_REGEX_RESP_SZ * j;
 208                 op->matches[j].rule_id =
 209                         MLX5_GET_VOLATILE(regexp_match_tuple,
 210                                           (job->output + offset), rule_id);
 211                 op->matches[j].start_offset =
 212                         MLX5_GET_VOLATILE(regexp_match_tuple,
 213                                           (job->output +  offset), start_ptr);
 214                 op->matches[j].len =
 215                         MLX5_GET_VOLATILE(regexp_match_tuple,
 216                                           (job->output +  offset), length);
 217         }
 218 }
 219
 220 static inline volatile struct mlx5_cqe *
 221 poll_one(struct mlx5_regex_cq *cq)
 222 {
 223         volatile struct mlx5_cqe *cqe;
 224         size_t next_cqe_offset;
 225
 226         next_cqe_offset =  (cq->ci & (cq_size_get(cq) - 1));
 227         cqe = (volatile struct mlx5_cqe *)(cq->cqe + next_cqe_offset);
 228         rte_io_wmb();
 229
 230         int ret = check_cqe(cqe, cq_size_get(cq), cq->ci);
 231
 232         if (unlikely(ret == MLX5_CQE_STATUS_ERR)) {
 233                 DRV_LOG(ERR, "Completion with error on qp 0x%x",  0);
 234                 return NULL;
 235         }
 236
 237         if (unlikely(ret != MLX5_CQE_STATUS_SW_OWN))
 238                 return NULL;
 239
 240         return cqe;
 241 }
 242
 243
 244 /**
 245  * DPDK callback for dequeue.
 246  *
 247  * @param dev
 248  *   Pointer to the regex dev structure.
 249  * @param qp_id
 250  *   The queue to enqueue the traffic to.
 251  * @param ops
 252  *   List of regex ops to dequeue.
 253  * @param nb_ops
 254  *   Number of ops in ops parameter.
 255  *
 256  * @return
 257  *   Number of packets successfully dequeued (<= pkts_n).
 258  */
 259 uint16_t
 260 mlx5_regexdev_dequeue(struct rte_regexdev *dev, uint16_t qp_id,
 261                       struct rte_regex_ops **ops, uint16_t nb_ops)
 262 {
 263         struct mlx5_regex_priv *priv = dev->data->dev_private;
 264         struct mlx5_regex_qp *queue = &priv->qps[qp_id];
 265         struct mlx5_regex_cq *cq = &queue->cq;
 266         volatile struct mlx5_cqe *cqe;
 267         size_t i = 0;
 268
 269         while ((cqe = poll_one(cq))) {
 270                 uint16_t wq_counter
 271                         = (rte_be_to_cpu_16(cqe->wqe_counter) + 1) &
 272                           MLX5_REGEX_MAX_WQE_INDEX;
 273                 size_t sqid = cqe->rsvd3[2];
 274                 struct mlx5_regex_sq *sq = &queue->sqs[sqid];
 275                 while (sq->ci != wq_counter) {
 276                         if (unlikely(i == nb_ops)) {
 277                                 /* Return without updating cq->ci */
 278                                 goto out;
 279                         }
 280                         uint32_t job_id = job_id_get(sqid, sq_size_get(sq),
 281                                                      sq->ci);
 282                         extract_result(ops[i], &queue->jobs[job_id]);
 283                         sq->ci = (sq->ci + 1) & MLX5_REGEX_MAX_WQE_INDEX;
 284                         i++;
 285                 }
 286                 cq->ci = (cq->ci + 1) & 0xffffff;
 287                 rte_wmb();
 288                 cq->dbr[0] = rte_cpu_to_be_32(cq->ci);
 289                 queue->free_sqs |= (1 << sqid);
 290         }
 291
 292 out:
 293         queue->ci += i;
 294         return i;
 295 }
 296
 297 static void
 298 setup_sqs(struct mlx5_regex_qp *queue)
 299 {
 300         size_t sqid, entry;
 301         uint32_t job_id;
 302         for (sqid = 0; sqid < queue->nb_obj; sqid++) {
 303                 struct mlx5_regex_sq *sq = &queue->sqs[sqid];
 304                 uint8_t *wqe = (uint8_t *)sq->wqe;
 305                 for (entry = 0 ; entry < sq_size_get(sq); entry++) {
 306                         job_id = sqid * sq_size_get(sq) + entry;
 307                         struct mlx5_regex_job *job = &queue->jobs[job_id];
 308
 309                         set_metadata_seg((struct mlx5_wqe_metadata_seg *)
 310                                          (wqe + MLX5_REGEX_WQE_METADATA_OFFSET),
 311                                          0, queue->metadata->lkey,
 312                                          (uintptr_t)job->metadata);
 313                         set_data_seg((struct mlx5_wqe_data_seg *)
 314                                      (wqe + MLX5_REGEX_WQE_SCATTER_OFFSET),
 315                                      MLX5_REGEX_MAX_OUTPUT,
 316                                      queue->outputs->lkey,
 317                                      (uintptr_t)job->output);
 318                         wqe += 64;
 319                 }
 320                 queue->free_sqs |= 1 << sqid;
 321         }
 322 }
 323
 324 static int
 325 setup_buffers(struct mlx5_regex_qp *qp, struct ibv_pd *pd)
 326 {
 327         uint32_t i;
 328         int err;
 329
 330         void *ptr = rte_calloc(__func__, qp->nb_desc,
 331                                MLX5_REGEX_METADATA_SIZE,
 332                                MLX5_REGEX_METADATA_SIZE);
 333         if (!ptr)
 334                 return -ENOMEM;
 335
 336         qp->metadata = mlx5_glue->reg_mr(pd, ptr,
 337                                          MLX5_REGEX_METADATA_SIZE*qp->nb_desc,
 338                                          IBV_ACCESS_LOCAL_WRITE);
 339         if (!qp->metadata) {
 340                 DRV_LOG(ERR, "Failed to register metadata");
 341                 rte_free(ptr);
 342                 return -EINVAL;
 343         }
 344
 345         ptr = rte_calloc(__func__, qp->nb_desc,
 346                          MLX5_REGEX_MAX_OUTPUT,
 347                          MLX5_REGEX_MAX_OUTPUT);
 348         if (!ptr) {
 349                 err = -ENOMEM;
 350                 goto err_output;
 351         }
 352         qp->outputs = mlx5_glue->reg_mr(pd, ptr,
 353                                         MLX5_REGEX_MAX_OUTPUT * qp->nb_desc,
 354                                         IBV_ACCESS_LOCAL_WRITE);
 355         if (!qp->outputs) {
 356                 rte_free(ptr);
 357                 DRV_LOG(ERR, "Failed to register output");
 358                 err = -EINVAL;
 359                 goto err_output;
 360         }
 361
 362         /* distribute buffers to jobs */
 363         for (i = 0; i < qp->nb_desc; i++) {
 364                 qp->jobs[i].output =
 365                         (uint8_t *)qp->outputs->addr +
 366                         (i % qp->nb_desc) * MLX5_REGEX_MAX_OUTPUT;
 367                 qp->jobs[i].metadata =
 368                         (uint8_t *)qp->metadata->addr +
 369                         (i % qp->nb_desc) * MLX5_REGEX_METADATA_SIZE;
 370         }
 371         return 0;
 372
 373 err_output:
 374         ptr = qp->metadata->addr;
 375         rte_free(ptr);
 376         mlx5_glue->dereg_mr(qp->metadata);
 377         return err;
 378 }
 379
 380 int
 381 mlx5_regexdev_setup_fastpath(struct mlx5_regex_priv *priv, uint32_t qp_id)
 382 {
 383         struct mlx5_regex_qp *qp = &priv->qps[qp_id];
 384         int err;
 385
 386         qp->jobs = rte_calloc(__func__, qp->nb_desc, sizeof(*qp->jobs), 64);
 387         if (!qp->jobs)
 388                 return -ENOMEM;
 389         err = setup_buffers(qp, priv->pd);
 390         if (err) {
 391                 rte_free(qp->jobs);
 392                 return err;
 393         }
 394         setup_sqs(qp);
 395         return 0;
 396 }
 397
 398 static void
 399 free_buffers(struct mlx5_regex_qp *qp)
 400 {
 401         if (qp->metadata) {
 402                 mlx5_glue->dereg_mr(qp->metadata);
 403                 rte_free(qp->metadata->addr);
 404         }
 405         if (qp->outputs) {
 406                 mlx5_glue->dereg_mr(qp->outputs);
 407                 rte_free(qp->outputs->addr);
 408         }
 409 }
 410
 411 void
 412 mlx5_regexdev_teardown_fastpath(struct mlx5_regex_priv *priv, uint32_t qp_id)
 413 {
 414         struct mlx5_regex_qp *qp = &priv->qps[qp_id];
 415
 416         if (qp) {
 417                 free_buffers(qp);
 418                 if (qp->jobs)
 419                         rte_free(qp->jobs);
 420         }
 421 }