drivers/common/cnxk/roc_npc_utils.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(C) 2021 Marvell.
   3  */
   4 #include "roc_api.h"
   5 #include "roc_priv.h"
   6
   7 static void
   8 npc_prep_mcam_ldata(uint8_t *ptr, const uint8_t *data, int len)
   9 {
  10         int idx;
  11
  12         for (idx = 0; idx < len; idx++)
  13                 ptr[idx] = data[len - 1 - idx];
  14 }
  15
  16 static int
  17 npc_check_copysz(size_t size, size_t len)
  18 {
  19         if (len <= size)
  20                 return len;
  21         return NPC_ERR_PARAM;
  22 }
  23
  24 static inline int
  25 npc_mem_is_zero(const void *mem, int len)
  26 {
  27         const char *m = mem;
  28         int i;
  29
  30         for (i = 0; i < len; i++) {
  31                 if (m[i] != 0)
  32                         return 0;
  33         }
  34         return 1;
  35 }
  36
  37 static void
  38 npc_set_hw_mask(struct npc_parse_item_info *info, struct npc_xtract_info *xinfo,
  39                 char *hw_mask)
  40 {
  41         int max_off, offset;
  42         int j;
  43
  44         if (xinfo->enable == 0)
  45                 return;
  46
  47         if (xinfo->hdr_off < info->hw_hdr_len)
  48                 return;
  49
  50         max_off = xinfo->hdr_off + xinfo->len - info->hw_hdr_len;
  51
  52         if (max_off > info->len)
  53                 max_off = info->len;
  54
  55         offset = xinfo->hdr_off - info->hw_hdr_len;
  56         for (j = offset; j < max_off; j++)
  57                 hw_mask[j] = 0xff;
  58 }
  59
  60 void
  61 npc_get_hw_supp_mask(struct npc_parse_state *pst,
  62                      struct npc_parse_item_info *info, int lid, int lt)
  63 {
  64         struct npc_xtract_info *xinfo, *lfinfo;
  65         char *hw_mask = info->hw_mask;
  66         int lf_cfg = 0;
  67         int i, j;
  68         int intf;
  69
  70         intf = pst->nix_intf;
  71         xinfo = pst->npc->prx_dxcfg[intf][lid][lt].xtract;
  72         memset(hw_mask, 0, info->len);
  73
  74         for (i = 0; i < NPC_MAX_LD; i++)
  75                 npc_set_hw_mask(info, &xinfo[i], hw_mask);
  76
  77         for (i = 0; i < NPC_MAX_LD; i++) {
  78                 if (xinfo[i].flags_enable == 0)
  79                         continue;
  80
  81                 lf_cfg = pst->npc->prx_lfcfg[i].i;
  82                 if (lf_cfg == lid) {
  83                         for (j = 0; j < NPC_MAX_LFL; j++) {
  84                                 lfinfo = pst->npc->prx_fxcfg[intf][i][j].xtract;
  85                                 npc_set_hw_mask(info, &lfinfo[0], hw_mask);
  86                         }
  87                 }
  88         }
  89 }
  90
  91 static inline int
  92 npc_mask_is_supported(const char *mask, const char *hw_mask, int len)
  93 {
  94         /*
  95          * If no hw_mask, assume nothing is supported.
  96          * mask is never NULL
  97          */
  98         if (hw_mask == NULL)
  99                 return npc_mem_is_zero(mask, len);
 100
 101         while (len--) {
 102                 if ((mask[len] | hw_mask[len]) != hw_mask[len])
 103                         return 0; /* False */
 104         }
 105         return 1;
 106 }
 107
 108 int
 109 npc_parse_item_basic(const struct roc_npc_item_info *item,
 110                      struct npc_parse_item_info *info)
 111 {
 112         /* Item must not be NULL */
 113         if (item == NULL)
 114                 return NPC_ERR_PARAM;
 115
 116         /* Don't support ranges */
 117         if (item->last != NULL)
 118                 return NPC_ERR_INVALID_RANGE;
 119
 120         /* If spec is NULL, both mask and last must be NULL, this
 121          * makes it to match ANY value (eq to mask = 0).
 122          * Setting either mask or last without spec is an error
 123          */
 124         if (item->spec == NULL) {
 125                 if (item->last == NULL && item->mask == NULL) {
 126                         info->spec = NULL;
 127                         return 0;
 128                 }
 129                 return NPC_ERR_INVALID_SPEC;
 130         }
 131
 132         /* We have valid spec */
 133         info->spec = item->spec;
 134
 135         /* If mask is not set, use default mask, err if default mask is
 136          * also NULL.
 137          */
 138         if (item->mask == NULL) {
 139                 if (info->def_mask == NULL)
 140                         return NPC_ERR_PARAM;
 141                 info->mask = info->def_mask;
 142         } else {
 143                 info->mask = item->mask;
 144         }
 145
 146         /* mask specified must be subset of hw supported mask
 147          * mask | hw_mask == hw_mask
 148          */
 149         if (!npc_mask_is_supported(info->mask, info->hw_mask, info->len))
 150                 return NPC_ERR_INVALID_MASK;
 151
 152         return 0;
 153 }
 154
 155 static int
 156 npc_update_extraction_data(struct npc_parse_state *pst,
 157                            struct npc_parse_item_info *info,
 158                            struct npc_xtract_info *xinfo)
 159 {
 160         uint8_t int_info_mask[NPC_MAX_EXTRACT_DATA_LEN];
 161         uint8_t int_info[NPC_MAX_EXTRACT_DATA_LEN];
 162         struct npc_xtract_info *x;
 163         int hdr_off;
 164         int len = 0;
 165
 166         x = xinfo;
 167         len = x->len;
 168         hdr_off = x->hdr_off;
 169
 170         if (hdr_off < info->hw_hdr_len)
 171                 return 0;
 172
 173         if (x->enable == 0)
 174                 return 0;
 175
 176         hdr_off -= info->hw_hdr_len;
 177
 178         if (hdr_off >= info->len)
 179                 return 0;
 180
 181         if (hdr_off + len > info->len)
 182                 len = info->len - hdr_off;
 183
 184         len = npc_check_copysz((ROC_NPC_MAX_MCAM_WIDTH_DWORDS * 8) - x->key_off,
 185                                len);
 186         if (len < 0)
 187                 return NPC_ERR_INVALID_SIZE;
 188
 189         /* Need to reverse complete structure so that dest addr is at
 190          * MSB so as to program the MCAM using mcam_data & mcam_mask
 191          * arrays
 192          */
 193         npc_prep_mcam_ldata(int_info, (const uint8_t *)info->spec + hdr_off,
 194                             x->len);
 195         npc_prep_mcam_ldata(int_info_mask,
 196                             (const uint8_t *)info->mask + hdr_off, x->len);
 197
 198         memcpy(pst->mcam_mask + x->key_off, int_info_mask, len);
 199         memcpy(pst->mcam_data + x->key_off, int_info, len);
 200         return 0;
 201 }
 202
 203 int
 204 npc_update_parse_state(struct npc_parse_state *pst,
 205                        struct npc_parse_item_info *info, int lid, int lt,
 206                        uint8_t flags)
 207 {
 208         struct npc_lid_lt_xtract_info *xinfo;
 209         struct npc_xtract_info *lfinfo;
 210         int intf, lf_cfg;
 211         int i, j, rc = 0;
 212
 213         pst->layer_mask |= lid;
 214         pst->lt[lid] = lt;
 215         pst->flags[lid] = flags;
 216
 217         intf = pst->nix_intf;
 218         xinfo = &pst->npc->prx_dxcfg[intf][lid][lt];
 219         if (xinfo->is_terminating)
 220                 pst->terminate = 1;
 221
 222         if (info->spec == NULL)
 223                 goto done;
 224
 225         for (i = 0; i < NPC_MAX_LD; i++) {
 226                 rc = npc_update_extraction_data(pst, info, &xinfo->xtract[i]);
 227                 if (rc != 0)
 228                         return rc;
 229         }
 230
 231         for (i = 0; i < NPC_MAX_LD; i++) {
 232                 if (xinfo->xtract[i].flags_enable == 0)
 233                         continue;
 234
 235                 lf_cfg = pst->npc->prx_lfcfg[i].i;
 236                 if (lf_cfg == lid) {
 237                         for (j = 0; j < NPC_MAX_LFL; j++) {
 238                                 lfinfo = pst->npc->prx_fxcfg[intf][i][j].xtract;
 239                                 rc = npc_update_extraction_data(pst, info,
 240                                                                 &lfinfo[0]);
 241                                 if (rc != 0)
 242                                         return rc;
 243
 244                                 if (lfinfo[0].enable)
 245                                         pst->flags[lid] = j;
 246                         }
 247                 }
 248         }
 249
 250 done:
 251         pst->pattern++;
 252         return 0;
 253 }
 254
 255 static int
 256 npc_first_set_bit(uint64_t slab)
 257 {
 258         int num = 0;
 259
 260         if ((slab & 0xffffffff) == 0) {
 261                 num += 32;
 262                 slab >>= 32;
 263         }
 264         if ((slab & 0xffff) == 0) {
 265                 num += 16;
 266                 slab >>= 16;
 267         }
 268         if ((slab & 0xff) == 0) {
 269                 num += 8;
 270                 slab >>= 8;
 271         }
 272         if ((slab & 0xf) == 0) {
 273                 num += 4;
 274                 slab >>= 4;
 275         }
 276         if ((slab & 0x3) == 0) {
 277                 num += 2;
 278                 slab >>= 2;
 279         }
 280         if ((slab & 0x1) == 0)
 281                 num += 1;
 282
 283         return num;
 284 }
 285
 286 static int
 287 npc_shift_lv_ent(struct mbox *mbox, struct roc_npc_flow *flow, struct npc *npc,
 288                  uint32_t old_ent, uint32_t new_ent)
 289 {
 290         struct npc_mcam_shift_entry_req *req;
 291         struct npc_mcam_shift_entry_rsp *rsp;
 292         struct npc_flow_list *list;
 293         struct roc_npc_flow *flow_iter;
 294         int rc = -ENOSPC;
 295
 296         list = &npc->flow_list[flow->priority];
 297
 298         /* Old entry is disabled & it's contents are moved to new_entry,
 299          * new entry is enabled finally.
 300          */
 301         req = mbox_alloc_msg_npc_mcam_shift_entry(mbox);
 302         if (req == NULL)
 303                 return rc;
 304         req->curr_entry[0] = old_ent;
 305         req->new_entry[0] = new_ent;
 306         req->shift_count = 1;
 307
 308         rc = mbox_process_msg(mbox, (void *)&rsp);
 309         if (rc)
 310                 return rc;
 311
 312         /* Remove old node from list */
 313         TAILQ_FOREACH(flow_iter, list, next) {
 314                 if (flow_iter->mcam_id == old_ent)
 315                         TAILQ_REMOVE(list, flow_iter, next);
 316         }
 317
 318         /* Insert node with new mcam id at right place */
 319         TAILQ_FOREACH(flow_iter, list, next) {
 320                 if (flow_iter->mcam_id > new_ent)
 321                         TAILQ_INSERT_BEFORE(flow_iter, flow, next);
 322         }
 323         return rc;
 324 }
 325
 326 /* Exchange all required entries with a given priority level */
 327 static int
 328 npc_shift_ent(struct mbox *mbox, struct roc_npc_flow *flow, struct npc *npc,
 329               struct npc_mcam_alloc_entry_rsp *rsp, int dir, int prio_lvl)
 330 {
 331         struct plt_bitmap *fr_bmp, *fr_bmp_rev, *lv_bmp, *lv_bmp_rev, *bmp;
 332         uint32_t e_fr = 0, e_lv = 0, e, e_id = 0, mcam_entries;
 333         uint64_t fr_bit_pos = 0, lv_bit_pos = 0, bit_pos = 0;
 334         /* Bit position within the slab */
 335         uint32_t sl_fr_bit_off = 0, sl_lv_bit_off = 0;
 336         /* Overall bit position of the start of slab */
 337         /* free & live entry index */
 338         int rc_fr = 0, rc_lv = 0, rc = 0, idx = 0;
 339         struct npc_mcam_ents_info *ent_info;
 340         /* free & live bitmap slab */
 341         uint64_t sl_fr = 0, sl_lv = 0, *sl;
 342
 343         fr_bmp = npc->free_entries[prio_lvl];
 344         fr_bmp_rev = npc->free_entries_rev[prio_lvl];
 345         lv_bmp = npc->live_entries[prio_lvl];
 346         lv_bmp_rev = npc->live_entries_rev[prio_lvl];
 347         ent_info = &npc->flow_entry_info[prio_lvl];
 348         mcam_entries = npc->mcam_entries;
 349
 350         /* New entries allocated are always contiguous, but older entries
 351          * already in free/live bitmap can be non-contiguous: so return
 352          * shifted entries should be in non-contiguous format.
 353          */
 354         while (idx <= rsp->count) {
 355                 if (!sl_fr && !sl_lv) {
 356                         /* Lower index elements to be exchanged */
 357                         if (dir < 0) {
 358                                 rc_fr = plt_bitmap_scan(fr_bmp, &e_fr, &sl_fr);
 359                                 rc_lv = plt_bitmap_scan(lv_bmp, &e_lv, &sl_lv);
 360                         } else {
 361                                 rc_fr = plt_bitmap_scan(fr_bmp_rev,
 362                                                         &sl_fr_bit_off, &sl_fr);
 363                                 rc_lv = plt_bitmap_scan(lv_bmp_rev,
 364                                                         &sl_lv_bit_off, &sl_lv);
 365                         }
 366                 }
 367
 368                 if (rc_fr) {
 369                         fr_bit_pos = npc_first_set_bit(sl_fr);
 370                         e_fr = sl_fr_bit_off + fr_bit_pos;
 371                 } else {
 372                         e_fr = ~(0);
 373                 }
 374
 375                 if (rc_lv) {
 376                         lv_bit_pos = npc_first_set_bit(sl_lv);
 377                         e_lv = sl_lv_bit_off + lv_bit_pos;
 378                 } else {
 379                         e_lv = ~(0);
 380                 }
 381
 382                 /* First entry is from free_bmap */
 383                 if (e_fr < e_lv) {
 384                         bmp = fr_bmp;
 385                         e = e_fr;
 386                         sl = &sl_fr;
 387                         bit_pos = fr_bit_pos;
 388                         if (dir > 0)
 389                                 e_id = mcam_entries - e - 1;
 390                         else
 391                                 e_id = e;
 392                 } else {
 393                         bmp = lv_bmp;
 394                         e = e_lv;
 395                         sl = &sl_lv;
 396                         bit_pos = lv_bit_pos;
 397                         if (dir > 0)
 398                                 e_id = mcam_entries - e - 1;
 399                         else
 400                                 e_id = e;
 401
 402                         if (idx < rsp->count)
 403                                 rc = npc_shift_lv_ent(mbox, flow, npc, e_id,
 404                                                       rsp->entry + idx);
 405                 }
 406
 407                 plt_bitmap_clear(bmp, e);
 408                 plt_bitmap_set(bmp, rsp->entry + idx);
 409                 /* Update entry list, use non-contiguous
 410                  * list now.
 411                  */
 412                 rsp->entry_list[idx] = e_id;
 413                 *sl &= ~(1UL << bit_pos);
 414
 415                 /* Update min & max entry identifiers in current
 416                  * priority level.
 417                  */
 418                 if (dir < 0) {
 419                         ent_info->max_id = rsp->entry + idx;
 420                         ent_info->min_id = e_id;
 421                 } else {
 422                         ent_info->max_id = e_id;
 423                         ent_info->min_id = rsp->entry;
 424                 }
 425
 426                 idx++;
 427         }
 428         return rc;
 429 }
 430
 431 /* Validate if newly allocated entries lie in the correct priority zone
 432  * since NPC_MCAM_LOWER_PRIO & NPC_MCAM_HIGHER_PRIO don't ensure zone accuracy.
 433  * If not properly aligned, shift entries to do so
 434  */
 435 static int
 436 npc_validate_and_shift_prio_ent(struct mbox *mbox, struct roc_npc_flow *flow,
 437                                 struct npc *npc,
 438                                 struct npc_mcam_alloc_entry_rsp *rsp,
 439                                 int req_prio)
 440 {
 441         int prio_idx = 0, rc = 0, needs_shift = 0, idx, prio = flow->priority;
 442         struct npc_mcam_ents_info *info = npc->flow_entry_info;
 443         int dir = (req_prio == NPC_MCAM_HIGHER_PRIO) ? 1 : -1;
 444         uint32_t tot_ent = 0;
 445
 446         if (dir < 0)
 447                 prio_idx = npc->flow_max_priority - 1;
 448
 449         /* Only live entries needs to be shifted, free entries can just be
 450          * moved by bits manipulation.
 451          */
 452
 453         /* For dir = -1(NPC_MCAM_LOWER_PRIO), when shifting,
 454          * NPC_MAX_PREALLOC_ENT are exchanged with adjoining higher priority
 455          * level entries(lower indexes).
 456          *
 457          * For dir = +1(NPC_MCAM_HIGHER_PRIO), during shift,
 458          * NPC_MAX_PREALLOC_ENT are exchanged with adjoining lower priority
 459          * level entries(higher indexes) with highest indexes.
 460          */
 461         do {
 462                 tot_ent = info[prio_idx].free_ent + info[prio_idx].live_ent;
 463
 464                 if (dir < 0 && prio_idx != prio &&
 465                     rsp->entry > info[prio_idx].max_id && tot_ent) {
 466                         needs_shift = 1;
 467                 } else if ((dir > 0) && (prio_idx != prio) &&
 468                            (rsp->entry < info[prio_idx].min_id) && tot_ent) {
 469                         needs_shift = 1;
 470                 }
 471
 472                 if (needs_shift) {
 473                         needs_shift = 0;
 474                         rc = npc_shift_ent(mbox, flow, npc, rsp, dir, prio_idx);
 475                 } else {
 476                         for (idx = 0; idx < rsp->count; idx++)
 477                                 rsp->entry_list[idx] = rsp->entry + idx;
 478                 }
 479         } while ((prio_idx != prio) && (prio_idx += dir));
 480
 481         return rc;
 482 }
 483
 484 static int
 485 npc_find_ref_entry(struct npc *npc, int *prio, int prio_lvl)
 486 {
 487         struct npc_mcam_ents_info *info = npc->flow_entry_info;
 488         int step = 1;
 489
 490         while (step < npc->flow_max_priority) {
 491                 if (((prio_lvl + step) < npc->flow_max_priority) &&
 492                     info[prio_lvl + step].live_ent) {
 493                         *prio = NPC_MCAM_HIGHER_PRIO;
 494                         return info[prio_lvl + step].min_id;
 495                 }
 496
 497                 if (((prio_lvl - step) >= 0) &&
 498                     info[prio_lvl - step].live_ent) {
 499                         *prio = NPC_MCAM_LOWER_PRIO;
 500                         return info[prio_lvl - step].max_id;
 501                 }
 502                 step++;
 503         }
 504         *prio = NPC_MCAM_ANY_PRIO;
 505         return 0;
 506 }
 507
 508 static int
 509 npc_fill_entry_cache(struct mbox *mbox, struct roc_npc_flow *flow,
 510                      struct npc *npc, uint32_t *free_ent)
 511 {
 512         struct plt_bitmap *free_bmp, *free_bmp_rev, *live_bmp, *live_bmp_rev;
 513         struct npc_mcam_alloc_entry_rsp rsp_local;
 514         struct npc_mcam_alloc_entry_rsp *rsp_cmd;
 515         struct npc_mcam_alloc_entry_req *req;
 516         struct npc_mcam_alloc_entry_rsp *rsp;
 517         struct npc_mcam_ents_info *info;
 518         int rc = -ENOSPC, prio;
 519         uint16_t ref_ent, idx;
 520
 521         info = &npc->flow_entry_info[flow->priority];
 522         free_bmp = npc->free_entries[flow->priority];
 523         free_bmp_rev = npc->free_entries_rev[flow->priority];
 524         live_bmp = npc->live_entries[flow->priority];
 525         live_bmp_rev = npc->live_entries_rev[flow->priority];
 526
 527         ref_ent = npc_find_ref_entry(npc, &prio, flow->priority);
 528
 529         req = mbox_alloc_msg_npc_mcam_alloc_entry(mbox);
 530         if (req == NULL)
 531                 return rc;
 532         req->contig = 1;
 533         req->count = npc->flow_prealloc_size;
 534         req->priority = prio;
 535         req->ref_entry = ref_ent;
 536
 537         rc = mbox_process_msg(mbox, (void *)&rsp_cmd);
 538         if (rc)
 539                 return rc;
 540
 541         rsp = &rsp_local;
 542         memcpy(rsp, rsp_cmd, sizeof(*rsp));
 543
 544         /* Non-first ent cache fill */
 545         if (prio != NPC_MCAM_ANY_PRIO) {
 546                 npc_validate_and_shift_prio_ent(mbox, flow, npc, rsp, prio);
 547         } else {
 548                 /* Copy into response entry list */
 549                 for (idx = 0; idx < rsp->count; idx++)
 550                         rsp->entry_list[idx] = rsp->entry + idx;
 551         }
 552
 553         /* Update free entries, reverse free entries list,
 554          * min & max entry ids.
 555          */
 556         for (idx = 0; idx < rsp->count; idx++) {
 557                 if (unlikely(rsp->entry_list[idx] < info->min_id))
 558                         info->min_id = rsp->entry_list[idx];
 559
 560                 if (unlikely(rsp->entry_list[idx] > info->max_id))
 561                         info->max_id = rsp->entry_list[idx];
 562
 563                 /* Skip entry to be returned, not to be part of free
 564                  * list.
 565                  */
 566                 if (prio == NPC_MCAM_HIGHER_PRIO) {
 567                         if (unlikely(idx == (rsp->count - 1))) {
 568                                 *free_ent = rsp->entry_list[idx];
 569                                 continue;
 570                         }
 571                 } else {
 572                         if (unlikely(!idx)) {
 573                                 *free_ent = rsp->entry_list[idx];
 574                                 continue;
 575                         }
 576                 }
 577                 info->free_ent++;
 578                 plt_bitmap_set(free_bmp, rsp->entry_list[idx]);
 579                 plt_bitmap_set(free_bmp_rev,
 580                                npc->mcam_entries - rsp->entry_list[idx] - 1);
 581         }
 582
 583         info->live_ent++;
 584         plt_bitmap_set(live_bmp, *free_ent);
 585         plt_bitmap_set(live_bmp_rev, npc->mcam_entries - *free_ent - 1);
 586
 587         return 0;
 588 }
 589
 590 int
 591 npc_check_preallocated_entry_cache(struct mbox *mbox, struct roc_npc_flow *flow,
 592                                    struct npc *npc)
 593 {
 594         struct plt_bitmap *free, *free_rev, *live, *live_rev;
 595         uint32_t pos = 0, free_ent = 0, mcam_entries;
 596         struct npc_mcam_ents_info *info;
 597         uint64_t slab = 0;
 598         int rc;
 599
 600         info = &npc->flow_entry_info[flow->priority];
 601
 602         free_rev = npc->free_entries_rev[flow->priority];
 603         free = npc->free_entries[flow->priority];
 604         live_rev = npc->live_entries_rev[flow->priority];
 605         live = npc->live_entries[flow->priority];
 606         mcam_entries = npc->mcam_entries;
 607
 608         if (info->free_ent) {
 609                 rc = plt_bitmap_scan(free, &pos, &slab);
 610                 if (rc) {
 611                         /* Get free_ent from free entry bitmap */
 612                         free_ent = pos + __builtin_ctzll(slab);
 613                         /* Remove from free bitmaps and add to live ones */
 614                         plt_bitmap_clear(free, free_ent);
 615                         plt_bitmap_set(live, free_ent);
 616                         plt_bitmap_clear(free_rev, mcam_entries - free_ent - 1);
 617                         plt_bitmap_set(live_rev, mcam_entries - free_ent - 1);
 618
 619                         info->free_ent--;
 620                         info->live_ent++;
 621                         return free_ent;
 622                 }
 623                 return NPC_ERR_INTERNAL;
 624         }
 625
 626         rc = npc_fill_entry_cache(mbox, flow, npc, &free_ent);
 627         if (rc)
 628                 return rc;
 629
 630         return free_ent;
 631 }