LXR linux/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex

   1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2/* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved */
   3
   4#include <linux/kernel.h>
   5#include <linux/slab.h>
   6#include <linux/list.h>
   7#include <linux/errno.h>
   8
   9#include "item.h"
  10#include "core_acl_flex_keys.h"
  11
  12/* For the purpose of the driver, define an internal storage scratchpad
  13 * that will be used to store key/mask values. For each defined element type
  14 * define an internal storage geometry.
  15 *
  16 * When adding new elements, MLXSW_AFK_ELEMENT_STORAGE_SIZE must be increased
  17 * accordingly.
  18 */
  19static const struct mlxsw_afk_element_info mlxsw_afk_element_infos[] = {
  20        MLXSW_AFK_ELEMENT_INFO_U32(SRC_SYS_PORT, 0x00, 16, 16),
  21        MLXSW_AFK_ELEMENT_INFO_BUF(DMAC_32_47, 0x04, 2),
  22        MLXSW_AFK_ELEMENT_INFO_BUF(DMAC_0_31, 0x06, 4),
  23        MLXSW_AFK_ELEMENT_INFO_BUF(SMAC_32_47, 0x0A, 2),
  24        MLXSW_AFK_ELEMENT_INFO_BUF(SMAC_0_31, 0x0C, 4),
  25        MLXSW_AFK_ELEMENT_INFO_U32(ETHERTYPE, 0x00, 0, 16),
  26        MLXSW_AFK_ELEMENT_INFO_U32(IP_PROTO, 0x10, 0, 8),
  27        MLXSW_AFK_ELEMENT_INFO_U32(VID, 0x10, 8, 12),
  28        MLXSW_AFK_ELEMENT_INFO_U32(PCP, 0x10, 20, 3),
  29        MLXSW_AFK_ELEMENT_INFO_U32(TCP_FLAGS, 0x10, 23, 9),
  30        MLXSW_AFK_ELEMENT_INFO_U32(DST_L4_PORT, 0x14, 0, 16),
  31        MLXSW_AFK_ELEMENT_INFO_U32(SRC_L4_PORT, 0x14, 16, 16),
  32        MLXSW_AFK_ELEMENT_INFO_U32(IP_TTL_, 0x18, 0, 8),
  33        MLXSW_AFK_ELEMENT_INFO_U32(IP_ECN, 0x18, 9, 2),
  34        MLXSW_AFK_ELEMENT_INFO_U32(IP_DSCP, 0x18, 11, 6),
  35        MLXSW_AFK_ELEMENT_INFO_U32(VIRT_ROUTER_8_10, 0x18, 17, 3),
  36        MLXSW_AFK_ELEMENT_INFO_U32(VIRT_ROUTER_0_7, 0x18, 20, 8),
  37        MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_96_127, 0x20, 4),
  38        MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_64_95, 0x24, 4),
  39        MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_32_63, 0x28, 4),
  40        MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_0_31, 0x2C, 4),
  41        MLXSW_AFK_ELEMENT_INFO_BUF(DST_IP_96_127, 0x30, 4),
  42        MLXSW_AFK_ELEMENT_INFO_BUF(DST_IP_64_95, 0x34, 4),
  43        MLXSW_AFK_ELEMENT_INFO_BUF(DST_IP_32_63, 0x38, 4),
  44        MLXSW_AFK_ELEMENT_INFO_BUF(DST_IP_0_31, 0x3C, 4),
  45};
  46
  47struct mlxsw_afk {
  48        struct list_head key_info_list;
  49        unsigned int max_blocks;
  50        const struct mlxsw_afk_ops *ops;
  51        const struct mlxsw_afk_block *blocks;
  52        unsigned int blocks_count;
  53};
  54
  55static bool mlxsw_afk_blocks_check(struct mlxsw_afk *mlxsw_afk)
  56{
  57        int i;
  58        int j;
  59
  60        for (i = 0; i < mlxsw_afk->blocks_count; i++) {
  61                const struct mlxsw_afk_block *block = &mlxsw_afk->blocks[i];
  62
  63                for (j = 0; j < block->instances_count; j++) {
  64                        const struct mlxsw_afk_element_info *elinfo;
  65                        struct mlxsw_afk_element_inst *elinst;
  66
  67                        elinst = &block->instances[j];
  68                        elinfo = &mlxsw_afk_element_infos[elinst->element];
  69                        if (elinst->type != elinfo->type ||
  70                            (!elinst->avoid_size_check &&
  71                             elinst->item.size.bits !=
  72                             elinfo->item.size.bits))
  73                                return false;
  74                }
  75        }
  76        return true;
  77}
  78
  79struct mlxsw_afk *mlxsw_afk_create(unsigned int max_blocks,
  80                                   const struct mlxsw_afk_ops *ops)
  81{
  82        struct mlxsw_afk *mlxsw_afk;
  83
  84        mlxsw_afk = kzalloc(sizeof(*mlxsw_afk), GFP_KERNEL);
  85        if (!mlxsw_afk)
  86                return NULL;
  87        INIT_LIST_HEAD(&mlxsw_afk->key_info_list);
  88        mlxsw_afk->max_blocks = max_blocks;
  89        mlxsw_afk->ops = ops;
  90        mlxsw_afk->blocks = ops->blocks;
  91        mlxsw_afk->blocks_count = ops->blocks_count;
  92        WARN_ON(!mlxsw_afk_blocks_check(mlxsw_afk));
  93        return mlxsw_afk;
  94}
  95EXPORT_SYMBOL(mlxsw_afk_create);
  96
  97void mlxsw_afk_destroy(struct mlxsw_afk *mlxsw_afk)
  98{
  99        WARN_ON(!list_empty(&mlxsw_afk->key_info_list));
 100        kfree(mlxsw_afk);
 101}
 102EXPORT_SYMBOL(mlxsw_afk_destroy);
 103
 104struct mlxsw_afk_key_info {
 105        struct list_head list;
 106        unsigned int ref_count;
 107        unsigned int blocks_count;
 108        int element_to_block[MLXSW_AFK_ELEMENT_MAX]; /* index is element, value
 109                                                      * is index inside "blocks"
 110                                                      */
 111        struct mlxsw_afk_element_usage elusage;
 112        const struct mlxsw_afk_block *blocks[];
 113};
 114
 115static bool
 116mlxsw_afk_key_info_elements_eq(struct mlxsw_afk_key_info *key_info,
 117                               struct mlxsw_afk_element_usage *elusage)
 118{
 119        return memcmp(&key_info->elusage, elusage, sizeof(*elusage)) == 0;
 120}
 121
 122static struct mlxsw_afk_key_info *
 123mlxsw_afk_key_info_find(struct mlxsw_afk *mlxsw_afk,
 124                        struct mlxsw_afk_element_usage *elusage)
 125{
 126        struct mlxsw_afk_key_info *key_info;
 127
 128        list_for_each_entry(key_info, &mlxsw_afk->key_info_list, list) {
 129                if (mlxsw_afk_key_info_elements_eq(key_info, elusage))
 130                        return key_info;
 131        }
 132        return NULL;
 133}
 134
 135struct mlxsw_afk_picker {
 136        DECLARE_BITMAP(element, MLXSW_AFK_ELEMENT_MAX);
 137        unsigned int total;
 138};
 139
 140static void mlxsw_afk_picker_count_hits(struct mlxsw_afk *mlxsw_afk,
 141                                        struct mlxsw_afk_picker *picker,
 142                                        enum mlxsw_afk_element element)
 143{
 144        int i;
 145        int j;
 146
 147        for (i = 0; i < mlxsw_afk->blocks_count; i++) {
 148                const struct mlxsw_afk_block *block = &mlxsw_afk->blocks[i];
 149
 150                for (j = 0; j < block->instances_count; j++) {
 151                        struct mlxsw_afk_element_inst *elinst;
 152
 153                        elinst = &block->instances[j];
 154                        if (elinst->element == element) {
 155                                __set_bit(element, picker[i].element);
 156                                picker[i].total++;
 157                        }
 158                }
 159        }
 160}
 161
 162static void mlxsw_afk_picker_subtract_hits(struct mlxsw_afk *mlxsw_afk,
 163                                           struct mlxsw_afk_picker *picker,
 164                                           int block_index)
 165{
 166        DECLARE_BITMAP(hits_element, MLXSW_AFK_ELEMENT_MAX);
 167        int i;
 168        int j;
 169
 170        memcpy(&hits_element, &picker[block_index].element,
 171               sizeof(hits_element));
 172
 173        for (i = 0; i < mlxsw_afk->blocks_count; i++) {
 174                for_each_set_bit(j, hits_element, MLXSW_AFK_ELEMENT_MAX) {
 175                        if (__test_and_clear_bit(j, picker[i].element))
 176                                picker[i].total--;
 177                }
 178        }
 179}
 180
 181static int mlxsw_afk_picker_most_hits_get(struct mlxsw_afk *mlxsw_afk,
 182                                          struct mlxsw_afk_picker *picker)
 183{
 184        int most_index = -EINVAL; /* Should never happen to return this */
 185        int most_hits = 0;
 186        int i;
 187
 188        for (i = 0; i < mlxsw_afk->blocks_count; i++) {
 189                if (picker[i].total > most_hits) {
 190                        most_hits = picker[i].total;
 191                        most_index = i;
 192                }
 193        }
 194        return most_index;
 195}
 196
 197static int mlxsw_afk_picker_key_info_add(struct mlxsw_afk *mlxsw_afk,
 198                                         struct mlxsw_afk_picker *picker,
 199                                         int block_index,
 200                                         struct mlxsw_afk_key_info *key_info)
 201{
 202        enum mlxsw_afk_element element;
 203
 204        if (key_info->blocks_count == mlxsw_afk->max_blocks)
 205                return -EINVAL;
 206
 207        for_each_set_bit(element, picker[block_index].element,
 208                         MLXSW_AFK_ELEMENT_MAX) {
 209                key_info->element_to_block[element] = key_info->blocks_count;
 210                mlxsw_afk_element_usage_add(&key_info->elusage, element);
 211        }
 212
 213        key_info->blocks[key_info->blocks_count] =
 214                                        &mlxsw_afk->blocks[block_index];
 215        key_info->blocks_count++;
 216        return 0;
 217}
 218
 219static int mlxsw_afk_picker(struct mlxsw_afk *mlxsw_afk,
 220                            struct mlxsw_afk_key_info *key_info,
 221                            struct mlxsw_afk_element_usage *elusage)
 222{
 223        struct mlxsw_afk_picker *picker;
 224        enum mlxsw_afk_element element;
 225        int err;
 226
 227        picker = kcalloc(mlxsw_afk->blocks_count, sizeof(*picker), GFP_KERNEL);
 228        if (!picker)
 229                return -ENOMEM;
 230
 231        /* Since the same elements could be present in multiple blocks,
 232         * we must find out optimal block list in order to make the
 233         * block count as low as possible.
 234         *
 235         * First, we count hits. We go over all available blocks and count
 236         * how many of requested elements are covered by each.
 237         *
 238         * Then in loop, we find block with most hits and add it to
 239         * output key_info. Then we have to subtract this block hits so
 240         * the next iteration will find most suitable block for
 241         * the rest of requested elements.
 242         */
 243
 244        mlxsw_afk_element_usage_for_each(element, elusage)
 245                mlxsw_afk_picker_count_hits(mlxsw_afk, picker, element);
 246
 247        do {
 248                int block_index;
 249
 250                block_index = mlxsw_afk_picker_most_hits_get(mlxsw_afk, picker);
 251                if (block_index < 0) {
 252                        err = block_index;
 253                        goto out;
 254                }
 255                err = mlxsw_afk_picker_key_info_add(mlxsw_afk, picker,
 256                                                    block_index, key_info);
 257                if (err)
 258                        goto out;
 259                mlxsw_afk_picker_subtract_hits(mlxsw_afk, picker, block_index);
 260        } while (!mlxsw_afk_key_info_elements_eq(key_info, elusage));
 261
 262        err = 0;
 263out:
 264        kfree(picker);
 265        return err;
 266}
 267
 268static struct mlxsw_afk_key_info *
 269mlxsw_afk_key_info_create(struct mlxsw_afk *mlxsw_afk,
 270                          struct mlxsw_afk_element_usage *elusage)
 271{
 272        struct mlxsw_afk_key_info *key_info;
 273        int err;
 274
 275        key_info = kzalloc(struct_size(key_info, blocks, mlxsw_afk->max_blocks),
 276                           GFP_KERNEL);
 277        if (!key_info)
 278                return ERR_PTR(-ENOMEM);
 279        err = mlxsw_afk_picker(mlxsw_afk, key_info, elusage);
 280        if (err)
 281                goto err_picker;
 282        list_add(&key_info->list, &mlxsw_afk->key_info_list);
 283        key_info->ref_count = 1;
 284        return key_info;
 285
 286err_picker:
 287        kfree(key_info);
 288        return ERR_PTR(err);
 289}
 290
 291static void mlxsw_afk_key_info_destroy(struct mlxsw_afk_key_info *key_info)
 292{
 293        list_del(&key_info->list);
 294        kfree(key_info);
 295}
 296
 297struct mlxsw_afk_key_info *
 298mlxsw_afk_key_info_get(struct mlxsw_afk *mlxsw_afk,
 299                       struct mlxsw_afk_element_usage *elusage)
 300{
 301        struct mlxsw_afk_key_info *key_info;
 302
 303        key_info = mlxsw_afk_key_info_find(mlxsw_afk, elusage);
 304        if (key_info) {
 305                key_info->ref_count++;
 306                return key_info;
 307        }
 308        return mlxsw_afk_key_info_create(mlxsw_afk, elusage);
 309}
 310EXPORT_SYMBOL(mlxsw_afk_key_info_get);
 311
 312void mlxsw_afk_key_info_put(struct mlxsw_afk_key_info *key_info)
 313{
 314        if (--key_info->ref_count)
 315                return;
 316        mlxsw_afk_key_info_destroy(key_info);
 317}
 318EXPORT_SYMBOL(mlxsw_afk_key_info_put);
 319
 320bool mlxsw_afk_key_info_subset(struct mlxsw_afk_key_info *key_info,
 321                               struct mlxsw_afk_element_usage *elusage)
 322{
 323        return mlxsw_afk_element_usage_subset(elusage, &key_info->elusage);
 324}
 325EXPORT_SYMBOL(mlxsw_afk_key_info_subset);
 326
 327static const struct mlxsw_afk_element_inst *
 328mlxsw_afk_block_elinst_get(const struct mlxsw_afk_block *block,
 329                           enum mlxsw_afk_element element)
 330{
 331        int i;
 332
 333        for (i = 0; i < block->instances_count; i++) {
 334                struct mlxsw_afk_element_inst *elinst;
 335
 336                elinst = &block->instances[i];
 337                if (elinst->element == element)
 338                        return elinst;
 339        }
 340        return NULL;
 341}
 342
 343static const struct mlxsw_afk_element_inst *
 344mlxsw_afk_key_info_elinst_get(struct mlxsw_afk_key_info *key_info,
 345                              enum mlxsw_afk_element element,
 346                              int *p_block_index)
 347{
 348        const struct mlxsw_afk_element_inst *elinst;
 349        const struct mlxsw_afk_block *block;
 350        int block_index;
 351
 352        if (WARN_ON(!test_bit(element, key_info->elusage.usage)))
 353                return NULL;
 354        block_index = key_info->element_to_block[element];
 355        block = key_info->blocks[block_index];
 356
 357        elinst = mlxsw_afk_block_elinst_get(block, element);
 358        if (WARN_ON(!elinst))
 359                return NULL;
 360
 361        *p_block_index = block_index;
 362        return elinst;
 363}
 364
 365u16
 366mlxsw_afk_key_info_block_encoding_get(const struct mlxsw_afk_key_info *key_info,
 367                                      int block_index)
 368{
 369        return key_info->blocks[block_index]->encoding;
 370}
 371EXPORT_SYMBOL(mlxsw_afk_key_info_block_encoding_get);
 372
 373unsigned int
 374mlxsw_afk_key_info_blocks_count_get(const struct mlxsw_afk_key_info *key_info)
 375{
 376        return key_info->blocks_count;
 377}
 378EXPORT_SYMBOL(mlxsw_afk_key_info_blocks_count_get);
 379
 380void mlxsw_afk_values_add_u32(struct mlxsw_afk_element_values *values,
 381                              enum mlxsw_afk_element element,
 382                              u32 key_value, u32 mask_value)
 383{
 384        const struct mlxsw_afk_element_info *elinfo =
 385                                &mlxsw_afk_element_infos[element];
 386        const struct mlxsw_item *storage_item = &elinfo->item;
 387
 388        if (!mask_value)
 389                return;
 390        if (WARN_ON(elinfo->type != MLXSW_AFK_ELEMENT_TYPE_U32))
 391                return;
 392        __mlxsw_item_set32(values->storage.key, storage_item, 0, key_value);
 393        __mlxsw_item_set32(values->storage.mask, storage_item, 0, mask_value);
 394        mlxsw_afk_element_usage_add(&values->elusage, element);
 395}
 396EXPORT_SYMBOL(mlxsw_afk_values_add_u32);
 397
 398void mlxsw_afk_values_add_buf(struct mlxsw_afk_element_values *values,
 399                              enum mlxsw_afk_element element,
 400                              const char *key_value, const char *mask_value,
 401                              unsigned int len)
 402{
 403        const struct mlxsw_afk_element_info *elinfo =
 404                                &mlxsw_afk_element_infos[element];
 405        const struct mlxsw_item *storage_item = &elinfo->item;
 406
 407        if (!memchr_inv(mask_value, 0, len)) /* If mask is zero */
 408                return;
 409        if (WARN_ON(elinfo->type != MLXSW_AFK_ELEMENT_TYPE_BUF) ||
 410            WARN_ON(elinfo->item.size.bytes != len))
 411                return;
 412        __mlxsw_item_memcpy_to(values->storage.key, key_value,
 413                               storage_item, 0);
 414        __mlxsw_item_memcpy_to(values->storage.mask, mask_value,
 415                               storage_item, 0);
 416        mlxsw_afk_element_usage_add(&values->elusage, element);
 417}
 418EXPORT_SYMBOL(mlxsw_afk_values_add_buf);
 419
 420static void mlxsw_sp_afk_encode_u32(const struct mlxsw_item *storage_item,
 421                                    const struct mlxsw_item *output_item,
 422                                    char *storage, char *output, int diff)
 423{
 424        u32 value;
 425
 426        value = __mlxsw_item_get32(storage, storage_item, 0);
 427        __mlxsw_item_set32(output, output_item, 0, value + diff);
 428}
 429
 430static void mlxsw_sp_afk_encode_buf(const struct mlxsw_item *storage_item,
 431                                    const struct mlxsw_item *output_item,
 432                                    char *storage, char *output)
 433{
 434        char *storage_data = __mlxsw_item_data(storage, storage_item, 0);
 435        char *output_data = __mlxsw_item_data(output, output_item, 0);
 436        size_t len = output_item->size.bytes;
 437
 438        memcpy(output_data, storage_data, len);
 439}
 440
 441static void
 442mlxsw_sp_afk_encode_one(const struct mlxsw_afk_element_inst *elinst,
 443                        char *output, char *storage, int u32_diff)
 444{
 445        const struct mlxsw_item *output_item = &elinst->item;
 446        const struct mlxsw_afk_element_info *elinfo;
 447        const struct mlxsw_item *storage_item;
 448
 449        elinfo = &mlxsw_afk_element_infos[elinst->element];
 450        storage_item = &elinfo->item;
 451        if (elinst->type == MLXSW_AFK_ELEMENT_TYPE_U32)
 452                mlxsw_sp_afk_encode_u32(storage_item, output_item,
 453                                        storage, output, u32_diff);
 454        else if (elinst->type == MLXSW_AFK_ELEMENT_TYPE_BUF)
 455                mlxsw_sp_afk_encode_buf(storage_item, output_item,
 456                                        storage, output);
 457}
 458
 459#define MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE 16
 460
 461void mlxsw_afk_encode(struct mlxsw_afk *mlxsw_afk,
 462                      struct mlxsw_afk_key_info *key_info,
 463                      struct mlxsw_afk_element_values *values,
 464                      char *key, char *mask)
 465{
 466        unsigned int blocks_count =
 467                        mlxsw_afk_key_info_blocks_count_get(key_info);
 468        char block_mask[MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE];
 469        char block_key[MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE];
 470        const struct mlxsw_afk_element_inst *elinst;
 471        enum mlxsw_afk_element element;
 472        int block_index, i;
 473
 474        for (i = 0; i < blocks_count; i++) {
 475                memset(block_key, 0, MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE);
 476                memset(block_mask, 0, MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE);
 477
 478                mlxsw_afk_element_usage_for_each(element, &values->elusage) {
 479                        elinst = mlxsw_afk_key_info_elinst_get(key_info,
 480                                                               element,
 481                                                               &block_index);
 482                        if (!elinst || block_index != i)
 483                                continue;
 484
 485                        mlxsw_sp_afk_encode_one(elinst, block_key,
 486                                                values->storage.key,
 487                                                elinst->u32_key_diff);
 488                        mlxsw_sp_afk_encode_one(elinst, block_mask,
 489                                                values->storage.mask, 0);
 490                }
 491
 492                mlxsw_afk->ops->encode_block(key, i, block_key);
 493                mlxsw_afk->ops->encode_block(mask, i, block_mask);
 494        }
 495}
 496EXPORT_SYMBOL(mlxsw_afk_encode);
 497
 498void mlxsw_afk_clear(struct mlxsw_afk *mlxsw_afk, char *key,
 499                     int block_start, int block_end)
 500{
 501        int i;
 502
 503        for (i = block_start; i <= block_end; i++)
 504                mlxsw_afk->ops->clear_block(key, i);
 505}
 506EXPORT_SYMBOL(mlxsw_afk_clear);
 507