469 lines
13 KiB
C
469 lines
13 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/* Copyright (c) 2020 Mellanox Technologies. All rights reserved */
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#include <linux/idr.h>
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#include <linux/log2.h>
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#include <linux/mutex.h>
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#include <linux/netlink.h>
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#include <net/devlink.h>
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#include "spectrum.h"
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struct mlxsw_sp_policer_family {
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enum mlxsw_sp_policer_type type;
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enum mlxsw_reg_qpcr_g qpcr_type;
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struct mlxsw_sp *mlxsw_sp;
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u16 start_index; /* Inclusive */
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u16 end_index; /* Exclusive */
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struct idr policer_idr;
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struct mutex lock; /* Protects policer_idr */
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atomic_t policers_count;
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const struct mlxsw_sp_policer_family_ops *ops;
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};
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struct mlxsw_sp_policer {
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struct mlxsw_sp_policer_params params;
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u16 index;
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};
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struct mlxsw_sp_policer_family_ops {
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int (*init)(struct mlxsw_sp_policer_family *family);
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void (*fini)(struct mlxsw_sp_policer_family *family);
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int (*policer_index_alloc)(struct mlxsw_sp_policer_family *family,
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struct mlxsw_sp_policer *policer);
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struct mlxsw_sp_policer * (*policer_index_free)(struct mlxsw_sp_policer_family *family,
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u16 policer_index);
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int (*policer_init)(struct mlxsw_sp_policer_family *family,
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const struct mlxsw_sp_policer *policer);
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int (*policer_params_check)(const struct mlxsw_sp_policer_family *family,
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const struct mlxsw_sp_policer_params *params,
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struct netlink_ext_ack *extack);
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};
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struct mlxsw_sp_policer_core {
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struct mlxsw_sp_policer_family *family_arr[MLXSW_SP_POLICER_TYPE_MAX + 1];
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const struct mlxsw_sp_policer_core_ops *ops;
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u8 lowest_bs_bits;
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u8 highest_bs_bits;
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};
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struct mlxsw_sp_policer_core_ops {
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int (*init)(struct mlxsw_sp_policer_core *policer_core);
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};
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static u64 mlxsw_sp_policer_rate_bytes_ps_kbps(u64 rate_bytes_ps)
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{
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return div_u64(rate_bytes_ps, 1000) * BITS_PER_BYTE;
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}
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static u8 mlxsw_sp_policer_burst_bytes_hw_units(u64 burst_bytes)
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{
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/* Provided burst size is in bytes. The ASIC burst size value is
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* (2 ^ bs) * 512 bits. Convert the provided size to 512-bit units.
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*/
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u64 bs512 = div_u64(burst_bytes, 64);
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if (!bs512)
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return 0;
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return fls64(bs512) - 1;
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}
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static u64 mlxsw_sp_policer_single_rate_occ_get(void *priv)
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{
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struct mlxsw_sp_policer_family *family = priv;
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return atomic_read(&family->policers_count);
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}
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static int
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mlxsw_sp_policer_single_rate_family_init(struct mlxsw_sp_policer_family *family)
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{
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struct mlxsw_core *core = family->mlxsw_sp->core;
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struct devlink *devlink;
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/* CPU policers are allocated from the first N policers in the global
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* range, so skip them.
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*/
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if (!MLXSW_CORE_RES_VALID(core, MAX_GLOBAL_POLICERS) ||
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!MLXSW_CORE_RES_VALID(core, MAX_CPU_POLICERS))
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return -EIO;
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family->start_index = MLXSW_CORE_RES_GET(core, MAX_CPU_POLICERS);
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family->end_index = MLXSW_CORE_RES_GET(core, MAX_GLOBAL_POLICERS);
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atomic_set(&family->policers_count, 0);
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devlink = priv_to_devlink(core);
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devl_resource_occ_get_register(devlink,
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MLXSW_SP_RESOURCE_SINGLE_RATE_POLICERS,
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mlxsw_sp_policer_single_rate_occ_get,
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family);
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return 0;
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}
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static void
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mlxsw_sp_policer_single_rate_family_fini(struct mlxsw_sp_policer_family *family)
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{
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struct devlink *devlink = priv_to_devlink(family->mlxsw_sp->core);
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devl_resource_occ_get_unregister(devlink,
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MLXSW_SP_RESOURCE_SINGLE_RATE_POLICERS);
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WARN_ON(atomic_read(&family->policers_count) != 0);
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}
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static int
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mlxsw_sp_policer_single_rate_index_alloc(struct mlxsw_sp_policer_family *family,
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struct mlxsw_sp_policer *policer)
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{
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int id;
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mutex_lock(&family->lock);
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id = idr_alloc(&family->policer_idr, policer, family->start_index,
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family->end_index, GFP_KERNEL);
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mutex_unlock(&family->lock);
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if (id < 0)
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return id;
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atomic_inc(&family->policers_count);
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policer->index = id;
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return 0;
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}
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static struct mlxsw_sp_policer *
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mlxsw_sp_policer_single_rate_index_free(struct mlxsw_sp_policer_family *family,
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u16 policer_index)
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{
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struct mlxsw_sp_policer *policer;
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atomic_dec(&family->policers_count);
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mutex_lock(&family->lock);
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policer = idr_remove(&family->policer_idr, policer_index);
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mutex_unlock(&family->lock);
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WARN_ON(!policer);
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return policer;
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}
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static int
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mlxsw_sp_policer_single_rate_init(struct mlxsw_sp_policer_family *family,
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const struct mlxsw_sp_policer *policer)
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{
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u64 rate_kbps = mlxsw_sp_policer_rate_bytes_ps_kbps(policer->params.rate);
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u8 bs = mlxsw_sp_policer_burst_bytes_hw_units(policer->params.burst);
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struct mlxsw_sp *mlxsw_sp = family->mlxsw_sp;
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char qpcr_pl[MLXSW_REG_QPCR_LEN];
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mlxsw_reg_qpcr_pack(qpcr_pl, policer->index, MLXSW_REG_QPCR_IR_UNITS_K,
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true, rate_kbps, bs);
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mlxsw_reg_qpcr_clear_counter_set(qpcr_pl, true);
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return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(qpcr), qpcr_pl);
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}
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static int
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mlxsw_sp_policer_single_rate_params_check(const struct mlxsw_sp_policer_family *family,
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const struct mlxsw_sp_policer_params *params,
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struct netlink_ext_ack *extack)
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{
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struct mlxsw_sp_policer_core *policer_core = family->mlxsw_sp->policer_core;
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u64 rate_bps = params->rate * BITS_PER_BYTE;
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u8 bs;
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if (!params->bytes) {
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NL_SET_ERR_MSG_MOD(extack, "Only bandwidth policing is currently supported by single rate policers");
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return -EINVAL;
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}
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if (!is_power_of_2(params->burst)) {
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NL_SET_ERR_MSG_MOD(extack, "Policer burst size is not power of two");
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return -EINVAL;
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}
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bs = mlxsw_sp_policer_burst_bytes_hw_units(params->burst);
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if (bs < policer_core->lowest_bs_bits) {
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NL_SET_ERR_MSG_MOD(extack, "Policer burst size lower than limit");
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return -EINVAL;
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}
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if (bs > policer_core->highest_bs_bits) {
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NL_SET_ERR_MSG_MOD(extack, "Policer burst size higher than limit");
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return -EINVAL;
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}
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if (rate_bps < MLXSW_REG_QPCR_LOWEST_CIR_BITS) {
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NL_SET_ERR_MSG_MOD(extack, "Policer rate lower than limit");
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return -EINVAL;
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}
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if (rate_bps > MLXSW_REG_QPCR_HIGHEST_CIR_BITS) {
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NL_SET_ERR_MSG_MOD(extack, "Policer rate higher than limit");
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return -EINVAL;
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}
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return 0;
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}
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static const struct mlxsw_sp_policer_family_ops mlxsw_sp_policer_single_rate_ops = {
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.init = mlxsw_sp_policer_single_rate_family_init,
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.fini = mlxsw_sp_policer_single_rate_family_fini,
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.policer_index_alloc = mlxsw_sp_policer_single_rate_index_alloc,
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.policer_index_free = mlxsw_sp_policer_single_rate_index_free,
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.policer_init = mlxsw_sp_policer_single_rate_init,
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.policer_params_check = mlxsw_sp_policer_single_rate_params_check,
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};
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static const struct mlxsw_sp_policer_family mlxsw_sp_policer_single_rate_family = {
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.type = MLXSW_SP_POLICER_TYPE_SINGLE_RATE,
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.qpcr_type = MLXSW_REG_QPCR_G_GLOBAL,
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.ops = &mlxsw_sp_policer_single_rate_ops,
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};
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static const struct mlxsw_sp_policer_family *mlxsw_sp_policer_family_arr[] = {
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[MLXSW_SP_POLICER_TYPE_SINGLE_RATE] = &mlxsw_sp_policer_single_rate_family,
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};
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int mlxsw_sp_policer_add(struct mlxsw_sp *mlxsw_sp,
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enum mlxsw_sp_policer_type type,
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const struct mlxsw_sp_policer_params *params,
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struct netlink_ext_ack *extack, u16 *p_policer_index)
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{
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struct mlxsw_sp_policer_family *family;
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struct mlxsw_sp_policer *policer;
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int err;
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family = mlxsw_sp->policer_core->family_arr[type];
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err = family->ops->policer_params_check(family, params, extack);
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if (err)
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return err;
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policer = kmalloc(sizeof(*policer), GFP_KERNEL);
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if (!policer)
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return -ENOMEM;
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policer->params = *params;
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err = family->ops->policer_index_alloc(family, policer);
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if (err) {
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NL_SET_ERR_MSG_MOD(extack, "Failed to allocate policer index");
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goto err_policer_index_alloc;
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}
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err = family->ops->policer_init(family, policer);
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if (err) {
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NL_SET_ERR_MSG_MOD(extack, "Failed to initialize policer");
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goto err_policer_init;
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}
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*p_policer_index = policer->index;
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return 0;
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err_policer_init:
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family->ops->policer_index_free(family, policer->index);
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err_policer_index_alloc:
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kfree(policer);
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return err;
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}
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void mlxsw_sp_policer_del(struct mlxsw_sp *mlxsw_sp,
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enum mlxsw_sp_policer_type type, u16 policer_index)
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{
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struct mlxsw_sp_policer_family *family;
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struct mlxsw_sp_policer *policer;
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family = mlxsw_sp->policer_core->family_arr[type];
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policer = family->ops->policer_index_free(family, policer_index);
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kfree(policer);
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}
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int mlxsw_sp_policer_drops_counter_get(struct mlxsw_sp *mlxsw_sp,
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enum mlxsw_sp_policer_type type,
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u16 policer_index, u64 *p_drops)
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{
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struct mlxsw_sp_policer_family *family;
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char qpcr_pl[MLXSW_REG_QPCR_LEN];
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int err;
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family = mlxsw_sp->policer_core->family_arr[type];
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MLXSW_REG_ZERO(qpcr, qpcr_pl);
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mlxsw_reg_qpcr_pid_set(qpcr_pl, policer_index);
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mlxsw_reg_qpcr_g_set(qpcr_pl, family->qpcr_type);
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err = mlxsw_reg_query(mlxsw_sp->core, MLXSW_REG(qpcr), qpcr_pl);
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if (err)
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return err;
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*p_drops = mlxsw_reg_qpcr_violate_count_get(qpcr_pl);
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return 0;
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}
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static int
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mlxsw_sp_policer_family_register(struct mlxsw_sp *mlxsw_sp,
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const struct mlxsw_sp_policer_family *tmpl)
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{
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struct mlxsw_sp_policer_family *family;
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int err;
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family = kmemdup(tmpl, sizeof(*family), GFP_KERNEL);
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if (!family)
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return -ENOMEM;
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family->mlxsw_sp = mlxsw_sp;
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idr_init(&family->policer_idr);
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mutex_init(&family->lock);
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err = family->ops->init(family);
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if (err)
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goto err_family_init;
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if (WARN_ON(family->start_index >= family->end_index)) {
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err = -EINVAL;
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goto err_index_check;
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}
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mlxsw_sp->policer_core->family_arr[tmpl->type] = family;
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return 0;
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err_index_check:
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family->ops->fini(family);
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err_family_init:
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mutex_destroy(&family->lock);
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idr_destroy(&family->policer_idr);
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kfree(family);
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return err;
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}
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||
|
|
static void
|
||
|
|
mlxsw_sp_policer_family_unregister(struct mlxsw_sp *mlxsw_sp,
|
||
|
|
struct mlxsw_sp_policer_family *family)
|
||
|
|
{
|
||
|
|
family->ops->fini(family);
|
||
|
|
mutex_destroy(&family->lock);
|
||
|
|
WARN_ON(!idr_is_empty(&family->policer_idr));
|
||
|
|
idr_destroy(&family->policer_idr);
|
||
|
|
kfree(family);
|
||
|
|
}
|
||
|
|
|
||
|
|
int mlxsw_sp_policers_init(struct mlxsw_sp *mlxsw_sp)
|
||
|
|
{
|
||
|
|
struct mlxsw_sp_policer_core *policer_core;
|
||
|
|
int i, err;
|
||
|
|
|
||
|
|
policer_core = kzalloc(sizeof(*policer_core), GFP_KERNEL);
|
||
|
|
if (!policer_core)
|
||
|
|
return -ENOMEM;
|
||
|
|
mlxsw_sp->policer_core = policer_core;
|
||
|
|
policer_core->ops = mlxsw_sp->policer_core_ops;
|
||
|
|
|
||
|
|
err = policer_core->ops->init(policer_core);
|
||
|
|
if (err)
|
||
|
|
goto err_init;
|
||
|
|
|
||
|
|
for (i = 0; i < MLXSW_SP_POLICER_TYPE_MAX + 1; i++) {
|
||
|
|
err = mlxsw_sp_policer_family_register(mlxsw_sp, mlxsw_sp_policer_family_arr[i]);
|
||
|
|
if (err)
|
||
|
|
goto err_family_register;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err_family_register:
|
||
|
|
for (i--; i >= 0; i--) {
|
||
|
|
struct mlxsw_sp_policer_family *family;
|
||
|
|
|
||
|
|
family = mlxsw_sp->policer_core->family_arr[i];
|
||
|
|
mlxsw_sp_policer_family_unregister(mlxsw_sp, family);
|
||
|
|
}
|
||
|
|
err_init:
|
||
|
|
kfree(mlxsw_sp->policer_core);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
void mlxsw_sp_policers_fini(struct mlxsw_sp *mlxsw_sp)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = MLXSW_SP_POLICER_TYPE_MAX; i >= 0; i--) {
|
||
|
|
struct mlxsw_sp_policer_family *family;
|
||
|
|
|
||
|
|
family = mlxsw_sp->policer_core->family_arr[i];
|
||
|
|
mlxsw_sp_policer_family_unregister(mlxsw_sp, family);
|
||
|
|
}
|
||
|
|
|
||
|
|
kfree(mlxsw_sp->policer_core);
|
||
|
|
}
|
||
|
|
|
||
|
|
int mlxsw_sp_policer_resources_register(struct mlxsw_core *mlxsw_core)
|
||
|
|
{
|
||
|
|
u64 global_policers, cpu_policers, single_rate_policers;
|
||
|
|
struct devlink *devlink = priv_to_devlink(mlxsw_core);
|
||
|
|
struct devlink_resource_size_params size_params;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
if (!MLXSW_CORE_RES_VALID(mlxsw_core, MAX_GLOBAL_POLICERS) ||
|
||
|
|
!MLXSW_CORE_RES_VALID(mlxsw_core, MAX_CPU_POLICERS))
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
global_policers = MLXSW_CORE_RES_GET(mlxsw_core, MAX_GLOBAL_POLICERS);
|
||
|
|
cpu_policers = MLXSW_CORE_RES_GET(mlxsw_core, MAX_CPU_POLICERS);
|
||
|
|
single_rate_policers = global_policers - cpu_policers;
|
||
|
|
|
||
|
|
devlink_resource_size_params_init(&size_params, global_policers,
|
||
|
|
global_policers, 1,
|
||
|
|
DEVLINK_RESOURCE_UNIT_ENTRY);
|
||
|
|
err = devl_resource_register(devlink, "global_policers",
|
||
|
|
global_policers,
|
||
|
|
MLXSW_SP_RESOURCE_GLOBAL_POLICERS,
|
||
|
|
DEVLINK_RESOURCE_ID_PARENT_TOP,
|
||
|
|
&size_params);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
devlink_resource_size_params_init(&size_params, single_rate_policers,
|
||
|
|
single_rate_policers, 1,
|
||
|
|
DEVLINK_RESOURCE_UNIT_ENTRY);
|
||
|
|
err = devl_resource_register(devlink, "single_rate_policers",
|
||
|
|
single_rate_policers,
|
||
|
|
MLXSW_SP_RESOURCE_SINGLE_RATE_POLICERS,
|
||
|
|
MLXSW_SP_RESOURCE_GLOBAL_POLICERS,
|
||
|
|
&size_params);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
mlxsw_sp1_policer_core_init(struct mlxsw_sp_policer_core *policer_core)
|
||
|
|
{
|
||
|
|
policer_core->lowest_bs_bits = MLXSW_REG_QPCR_LOWEST_CBS_BITS_SP1;
|
||
|
|
policer_core->highest_bs_bits = MLXSW_REG_QPCR_HIGHEST_CBS_BITS_SP1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct mlxsw_sp_policer_core_ops mlxsw_sp1_policer_core_ops = {
|
||
|
|
.init = mlxsw_sp1_policer_core_init,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int
|
||
|
|
mlxsw_sp2_policer_core_init(struct mlxsw_sp_policer_core *policer_core)
|
||
|
|
{
|
||
|
|
policer_core->lowest_bs_bits = MLXSW_REG_QPCR_LOWEST_CBS_BITS_SP2;
|
||
|
|
policer_core->highest_bs_bits = MLXSW_REG_QPCR_HIGHEST_CBS_BITS_SP2;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct mlxsw_sp_policer_core_ops mlxsw_sp2_policer_core_ops = {
|
||
|
|
.init = mlxsw_sp2_policer_core_init,
|
||
|
|
};
|