blob: f1b09c2f9eda480aa77f3a44ea82756dc090f912 [file] [log] [blame]
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/errno.h>
#include "item.h"
#include "core_acl_flex_keys.h"
/* For the purpose of the driver, define an internal storage scratchpad
* that will be used to store key/mask values. For each defined element type
* define an internal storage geometry.
*
* When adding new elements, MLXSW_AFK_ELEMENT_STORAGE_SIZE must be increased
* accordingly.
*/
static const struct mlxsw_afk_element_info mlxsw_afk_element_infos[] = {
MLXSW_AFK_ELEMENT_INFO_U32(SRC_SYS_PORT, 0x00, 16, 16),
MLXSW_AFK_ELEMENT_INFO_BUF(DMAC_32_47, 0x04, 2),
MLXSW_AFK_ELEMENT_INFO_BUF(DMAC_0_31, 0x06, 4),
MLXSW_AFK_ELEMENT_INFO_BUF(SMAC_32_47, 0x0A, 2),
MLXSW_AFK_ELEMENT_INFO_BUF(SMAC_0_31, 0x0C, 4),
MLXSW_AFK_ELEMENT_INFO_U32(ETHERTYPE, 0x00, 0, 16),
MLXSW_AFK_ELEMENT_INFO_U32(IP_PROTO, 0x10, 0, 8),
MLXSW_AFK_ELEMENT_INFO_U32(VID, 0x10, 8, 12),
MLXSW_AFK_ELEMENT_INFO_U32(PCP, 0x10, 20, 3),
MLXSW_AFK_ELEMENT_INFO_U32(TCP_FLAGS, 0x10, 23, 9),
MLXSW_AFK_ELEMENT_INFO_U32(DST_L4_PORT, 0x14, 0, 16),
MLXSW_AFK_ELEMENT_INFO_U32(SRC_L4_PORT, 0x14, 16, 16),
MLXSW_AFK_ELEMENT_INFO_U32(IP_TTL_, 0x18, 0, 8),
MLXSW_AFK_ELEMENT_INFO_U32(IP_ECN, 0x18, 9, 2),
MLXSW_AFK_ELEMENT_INFO_U32(IP_DSCP, 0x18, 11, 6),
MLXSW_AFK_ELEMENT_INFO_U32(VIRT_ROUTER_8_10, 0x18, 17, 3),
MLXSW_AFK_ELEMENT_INFO_U32(VIRT_ROUTER_0_7, 0x18, 20, 8),
MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_96_127, 0x20, 4),
MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_64_95, 0x24, 4),
MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_32_63, 0x28, 4),
MLXSW_AFK_ELEMENT_INFO_BUF(SRC_IP_0_31, 0x2C, 4),
MLXSW_AFK_ELEMENT_INFO_BUF(DST_IP_96_127, 0x30, 4),
MLXSW_AFK_ELEMENT_INFO_BUF(DST_IP_64_95, 0x34, 4),
MLXSW_AFK_ELEMENT_INFO_BUF(DST_IP_32_63, 0x38, 4),
MLXSW_AFK_ELEMENT_INFO_BUF(DST_IP_0_31, 0x3C, 4),
};
struct mlxsw_afk {
struct list_head key_info_list;
unsigned int max_blocks;
const struct mlxsw_afk_ops *ops;
const struct mlxsw_afk_block *blocks;
unsigned int blocks_count;
};
static bool mlxsw_afk_blocks_check(struct mlxsw_afk *mlxsw_afk)
{
int i;
int j;
for (i = 0; i < mlxsw_afk->blocks_count; i++) {
const struct mlxsw_afk_block *block = &mlxsw_afk->blocks[i];
for (j = 0; j < block->instances_count; j++) {
const struct mlxsw_afk_element_info *elinfo;
struct mlxsw_afk_element_inst *elinst;
elinst = &block->instances[j];
elinfo = &mlxsw_afk_element_infos[elinst->element];
if (elinst->type != elinfo->type ||
(!elinst->avoid_size_check &&
elinst->item.size.bits !=
elinfo->item.size.bits))
return false;
}
}
return true;
}
struct mlxsw_afk *mlxsw_afk_create(unsigned int max_blocks,
const struct mlxsw_afk_ops *ops)
{
struct mlxsw_afk *mlxsw_afk;
mlxsw_afk = kzalloc(sizeof(*mlxsw_afk), GFP_KERNEL);
if (!mlxsw_afk)
return NULL;
INIT_LIST_HEAD(&mlxsw_afk->key_info_list);
mlxsw_afk->max_blocks = max_blocks;
mlxsw_afk->ops = ops;
mlxsw_afk->blocks = ops->blocks;
mlxsw_afk->blocks_count = ops->blocks_count;
WARN_ON(!mlxsw_afk_blocks_check(mlxsw_afk));
return mlxsw_afk;
}
EXPORT_SYMBOL(mlxsw_afk_create);
void mlxsw_afk_destroy(struct mlxsw_afk *mlxsw_afk)
{
WARN_ON(!list_empty(&mlxsw_afk->key_info_list));
kfree(mlxsw_afk);
}
EXPORT_SYMBOL(mlxsw_afk_destroy);
struct mlxsw_afk_key_info {
struct list_head list;
unsigned int ref_count;
unsigned int blocks_count;
int element_to_block[MLXSW_AFK_ELEMENT_MAX]; /* index is element, value
* is index inside "blocks"
*/
struct mlxsw_afk_element_usage elusage;
const struct mlxsw_afk_block *blocks[];
};
static bool
mlxsw_afk_key_info_elements_eq(struct mlxsw_afk_key_info *key_info,
struct mlxsw_afk_element_usage *elusage)
{
return memcmp(&key_info->elusage, elusage, sizeof(*elusage)) == 0;
}
static struct mlxsw_afk_key_info *
mlxsw_afk_key_info_find(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_element_usage *elusage)
{
struct mlxsw_afk_key_info *key_info;
list_for_each_entry(key_info, &mlxsw_afk->key_info_list, list) {
if (mlxsw_afk_key_info_elements_eq(key_info, elusage))
return key_info;
}
return NULL;
}
struct mlxsw_afk_picker {
DECLARE_BITMAP(element, MLXSW_AFK_ELEMENT_MAX);
unsigned int total;
};
static void mlxsw_afk_picker_count_hits(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_picker *picker,
enum mlxsw_afk_element element)
{
int i;
int j;
for (i = 0; i < mlxsw_afk->blocks_count; i++) {
const struct mlxsw_afk_block *block = &mlxsw_afk->blocks[i];
for (j = 0; j < block->instances_count; j++) {
struct mlxsw_afk_element_inst *elinst;
elinst = &block->instances[j];
if (elinst->element == element) {
__set_bit(element, picker[i].element);
picker[i].total++;
}
}
}
}
static void mlxsw_afk_picker_subtract_hits(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_picker *picker,
int block_index)
{
DECLARE_BITMAP(hits_element, MLXSW_AFK_ELEMENT_MAX);
int i;
int j;
memcpy(&hits_element, &picker[block_index].element,
sizeof(hits_element));
for (i = 0; i < mlxsw_afk->blocks_count; i++) {
for_each_set_bit(j, hits_element, MLXSW_AFK_ELEMENT_MAX) {
if (__test_and_clear_bit(j, picker[i].element))
picker[i].total--;
}
}
}
static int mlxsw_afk_picker_most_hits_get(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_picker *picker)
{
int most_index = -EINVAL; /* Should never happen to return this */
int most_hits = 0;
int i;
for (i = 0; i < mlxsw_afk->blocks_count; i++) {
if (picker[i].total > most_hits) {
most_hits = picker[i].total;
most_index = i;
}
}
return most_index;
}
static int mlxsw_afk_picker_key_info_add(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_picker *picker,
int block_index,
struct mlxsw_afk_key_info *key_info)
{
enum mlxsw_afk_element element;
if (key_info->blocks_count == mlxsw_afk->max_blocks)
return -EINVAL;
for_each_set_bit(element, picker[block_index].element,
MLXSW_AFK_ELEMENT_MAX) {
key_info->element_to_block[element] = key_info->blocks_count;
mlxsw_afk_element_usage_add(&key_info->elusage, element);
}
key_info->blocks[key_info->blocks_count] =
&mlxsw_afk->blocks[block_index];
key_info->blocks_count++;
return 0;
}
static int mlxsw_afk_picker(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_key_info *key_info,
struct mlxsw_afk_element_usage *elusage)
{
struct mlxsw_afk_picker *picker;
enum mlxsw_afk_element element;
int err;
picker = kcalloc(mlxsw_afk->blocks_count, sizeof(*picker), GFP_KERNEL);
if (!picker)
return -ENOMEM;
/* Since the same elements could be present in multiple blocks,
* we must find out optimal block list in order to make the
* block count as low as possible.
*
* First, we count hits. We go over all available blocks and count
* how many of requested elements are covered by each.
*
* Then in loop, we find block with most hits and add it to
* output key_info. Then we have to subtract this block hits so
* the next iteration will find most suitable block for
* the rest of requested elements.
*/
mlxsw_afk_element_usage_for_each(element, elusage)
mlxsw_afk_picker_count_hits(mlxsw_afk, picker, element);
do {
int block_index;
block_index = mlxsw_afk_picker_most_hits_get(mlxsw_afk, picker);
if (block_index < 0) {
err = block_index;
goto out;
}
err = mlxsw_afk_picker_key_info_add(mlxsw_afk, picker,
block_index, key_info);
if (err)
goto out;
mlxsw_afk_picker_subtract_hits(mlxsw_afk, picker, block_index);
} while (!mlxsw_afk_key_info_elements_eq(key_info, elusage));
err = 0;
out:
kfree(picker);
return err;
}
static struct mlxsw_afk_key_info *
mlxsw_afk_key_info_create(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_element_usage *elusage)
{
struct mlxsw_afk_key_info *key_info;
int err;
key_info = kzalloc(struct_size(key_info, blocks, mlxsw_afk->max_blocks),
GFP_KERNEL);
if (!key_info)
return ERR_PTR(-ENOMEM);
err = mlxsw_afk_picker(mlxsw_afk, key_info, elusage);
if (err)
goto err_picker;
list_add(&key_info->list, &mlxsw_afk->key_info_list);
key_info->ref_count = 1;
return key_info;
err_picker:
kfree(key_info);
return ERR_PTR(err);
}
static void mlxsw_afk_key_info_destroy(struct mlxsw_afk_key_info *key_info)
{
list_del(&key_info->list);
kfree(key_info);
}
struct mlxsw_afk_key_info *
mlxsw_afk_key_info_get(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_element_usage *elusage)
{
struct mlxsw_afk_key_info *key_info;
key_info = mlxsw_afk_key_info_find(mlxsw_afk, elusage);
if (key_info) {
key_info->ref_count++;
return key_info;
}
return mlxsw_afk_key_info_create(mlxsw_afk, elusage);
}
EXPORT_SYMBOL(mlxsw_afk_key_info_get);
void mlxsw_afk_key_info_put(struct mlxsw_afk_key_info *key_info)
{
if (--key_info->ref_count)
return;
mlxsw_afk_key_info_destroy(key_info);
}
EXPORT_SYMBOL(mlxsw_afk_key_info_put);
bool mlxsw_afk_key_info_subset(struct mlxsw_afk_key_info *key_info,
struct mlxsw_afk_element_usage *elusage)
{
return mlxsw_afk_element_usage_subset(elusage, &key_info->elusage);
}
EXPORT_SYMBOL(mlxsw_afk_key_info_subset);
static const struct mlxsw_afk_element_inst *
mlxsw_afk_block_elinst_get(const struct mlxsw_afk_block *block,
enum mlxsw_afk_element element)
{
int i;
for (i = 0; i < block->instances_count; i++) {
struct mlxsw_afk_element_inst *elinst;
elinst = &block->instances[i];
if (elinst->element == element)
return elinst;
}
return NULL;
}
static const struct mlxsw_afk_element_inst *
mlxsw_afk_key_info_elinst_get(struct mlxsw_afk_key_info *key_info,
enum mlxsw_afk_element element,
int *p_block_index)
{
const struct mlxsw_afk_element_inst *elinst;
const struct mlxsw_afk_block *block;
int block_index;
if (WARN_ON(!test_bit(element, key_info->elusage.usage)))
return NULL;
block_index = key_info->element_to_block[element];
block = key_info->blocks[block_index];
elinst = mlxsw_afk_block_elinst_get(block, element);
if (WARN_ON(!elinst))
return NULL;
*p_block_index = block_index;
return elinst;
}
u16
mlxsw_afk_key_info_block_encoding_get(const struct mlxsw_afk_key_info *key_info,
int block_index)
{
return key_info->blocks[block_index]->encoding;
}
EXPORT_SYMBOL(mlxsw_afk_key_info_block_encoding_get);
unsigned int
mlxsw_afk_key_info_blocks_count_get(const struct mlxsw_afk_key_info *key_info)
{
return key_info->blocks_count;
}
EXPORT_SYMBOL(mlxsw_afk_key_info_blocks_count_get);
void mlxsw_afk_values_add_u32(struct mlxsw_afk_element_values *values,
enum mlxsw_afk_element element,
u32 key_value, u32 mask_value)
{
const struct mlxsw_afk_element_info *elinfo =
&mlxsw_afk_element_infos[element];
const struct mlxsw_item *storage_item = &elinfo->item;
if (!mask_value)
return;
if (WARN_ON(elinfo->type != MLXSW_AFK_ELEMENT_TYPE_U32))
return;
__mlxsw_item_set32(values->storage.key, storage_item, 0, key_value);
__mlxsw_item_set32(values->storage.mask, storage_item, 0, mask_value);
mlxsw_afk_element_usage_add(&values->elusage, element);
}
EXPORT_SYMBOL(mlxsw_afk_values_add_u32);
void mlxsw_afk_values_add_buf(struct mlxsw_afk_element_values *values,
enum mlxsw_afk_element element,
const char *key_value, const char *mask_value,
unsigned int len)
{
const struct mlxsw_afk_element_info *elinfo =
&mlxsw_afk_element_infos[element];
const struct mlxsw_item *storage_item = &elinfo->item;
if (!memchr_inv(mask_value, 0, len)) /* If mask is zero */
return;
if (WARN_ON(elinfo->type != MLXSW_AFK_ELEMENT_TYPE_BUF) ||
WARN_ON(elinfo->item.size.bytes != len))
return;
__mlxsw_item_memcpy_to(values->storage.key, key_value,
storage_item, 0);
__mlxsw_item_memcpy_to(values->storage.mask, mask_value,
storage_item, 0);
mlxsw_afk_element_usage_add(&values->elusage, element);
}
EXPORT_SYMBOL(mlxsw_afk_values_add_buf);
static void mlxsw_sp_afk_encode_u32(const struct mlxsw_item *storage_item,
const struct mlxsw_item *output_item,
char *storage, char *output, int diff)
{
u32 value;
value = __mlxsw_item_get32(storage, storage_item, 0);
__mlxsw_item_set32(output, output_item, 0, value + diff);
}
static void mlxsw_sp_afk_encode_buf(const struct mlxsw_item *storage_item,
const struct mlxsw_item *output_item,
char *storage, char *output)
{
char *storage_data = __mlxsw_item_data(storage, storage_item, 0);
char *output_data = __mlxsw_item_data(output, output_item, 0);
size_t len = output_item->size.bytes;
memcpy(output_data, storage_data, len);
}
static void
mlxsw_sp_afk_encode_one(const struct mlxsw_afk_element_inst *elinst,
char *output, char *storage, int u32_diff)
{
const struct mlxsw_item *output_item = &elinst->item;
const struct mlxsw_afk_element_info *elinfo;
const struct mlxsw_item *storage_item;
elinfo = &mlxsw_afk_element_infos[elinst->element];
storage_item = &elinfo->item;
if (elinst->type == MLXSW_AFK_ELEMENT_TYPE_U32)
mlxsw_sp_afk_encode_u32(storage_item, output_item,
storage, output, u32_diff);
else if (elinst->type == MLXSW_AFK_ELEMENT_TYPE_BUF)
mlxsw_sp_afk_encode_buf(storage_item, output_item,
storage, output);
}
#define MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE 16
void mlxsw_afk_encode(struct mlxsw_afk *mlxsw_afk,
struct mlxsw_afk_key_info *key_info,
struct mlxsw_afk_element_values *values,
char *key, char *mask)
{
unsigned int blocks_count =
mlxsw_afk_key_info_blocks_count_get(key_info);
char block_mask[MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE];
char block_key[MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE];
const struct mlxsw_afk_element_inst *elinst;
enum mlxsw_afk_element element;
int block_index, i;
for (i = 0; i < blocks_count; i++) {
memset(block_key, 0, MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE);
memset(block_mask, 0, MLXSW_SP_AFK_KEY_BLOCK_MAX_SIZE);
mlxsw_afk_element_usage_for_each(element, &values->elusage) {
elinst = mlxsw_afk_key_info_elinst_get(key_info,
element,
&block_index);
if (!elinst || block_index != i)
continue;
mlxsw_sp_afk_encode_one(elinst, block_key,
values->storage.key,
elinst->u32_key_diff);
mlxsw_sp_afk_encode_one(elinst, block_mask,
values->storage.mask, 0);
}
mlxsw_afk->ops->encode_block(key, i, block_key);
mlxsw_afk->ops->encode_block(mask, i, block_mask);
}
}
EXPORT_SYMBOL(mlxsw_afk_encode);
void mlxsw_afk_clear(struct mlxsw_afk *mlxsw_afk, char *key,
int block_start, int block_end)
{
int i;
for (i = block_start; i <= block_end; i++)
mlxsw_afk->ops->clear_block(key, i);
}
EXPORT_SYMBOL(mlxsw_afk_clear);