88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2020 MediaTek Inc.
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*/
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/*****************************************************************************
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*
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* Filename:
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* ---------
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* rps_perf.c
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*
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* Project:
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* --------
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*
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*
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* Description:
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* ------------
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* network performance interface
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*
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* Author:
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* -------
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* Anny.Hu(mtk80401)
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*
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****************************************************************************/
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#include <linux/netdevice.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <linux/ipv6.h>
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#include <net/ipv6.h>
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#include <net/sch_generic.h>
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include "rps_perf.h"
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int set_rps_map(struct netdev_rx_queue *queue, unsigned long rps_value)
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{
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#ifdef CONFIG_RPS
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struct rps_map *old_map, *map;
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cpumask_var_t mask;
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int cpu, i, len = 3;
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static DEFINE_MUTEX(rps_map_mutex);
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if (!alloc_cpumask_var(&mask, GFP_KERNEL))
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return -ENOMEM;
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*cpumask_bits(mask) = rps_value;
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map = kzalloc(max_t(unsigned int,
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RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
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GFP_KERNEL);
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if (!map) {
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free_cpumask_var(mask);
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return -ENOMEM;
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}
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i = 0;
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for_each_cpu_and(cpu, mask, cpu_online_mask)
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map->cpus[i++] = cpu;
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if (i) {
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map->len = i;
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} else {
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kfree(map);
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map = NULL;
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}
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mutex_lock(&rps_map_mutex);
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old_map = rcu_dereference_protected(queue->rps_map,
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mutex_is_locked(&rps_map_mutex));
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rcu_assign_pointer(queue->rps_map, map);
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if (map)
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static_key_slow_inc(&rps_needed);
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if (old_map)
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static_key_slow_dec(&rps_needed);
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mutex_unlock(&rps_map_mutex);
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if (old_map)
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kfree_rcu(old_map, rcu);
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free_cpumask_var(mask);
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return map ? len : 0;
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#else
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return 0;
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#endif
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}
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EXPORT_SYMBOL(set_rps_map);
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