419 lines
11 KiB
C
419 lines
11 KiB
C
/*
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* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
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* Copyright (c) 2017-2018, Broadcom Limited. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef NET_DIM_H
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#define NET_DIM_H
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#include <linux/module.h>
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struct net_dim_cq_moder {
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u16 usec;
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u16 pkts;
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u8 cq_period_mode;
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};
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struct net_dim_sample {
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ktime_t time;
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u32 pkt_ctr;
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u32 byte_ctr;
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u16 event_ctr;
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};
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struct net_dim_stats {
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int ppms; /* packets per msec */
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int bpms; /* bytes per msec */
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int epms; /* events per msec */
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};
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struct net_dim { /* Adaptive Moderation */
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u8 state;
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struct net_dim_stats prev_stats;
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struct net_dim_sample start_sample;
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struct work_struct work;
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u8 profile_ix;
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u8 mode;
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u8 tune_state;
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u8 steps_right;
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u8 steps_left;
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u8 tired;
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};
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enum {
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NET_DIM_CQ_PERIOD_MODE_START_FROM_EQE = 0x0,
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NET_DIM_CQ_PERIOD_MODE_START_FROM_CQE = 0x1,
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NET_DIM_CQ_PERIOD_NUM_MODES
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};
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/* Adaptive moderation logic */
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enum {
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NET_DIM_START_MEASURE,
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NET_DIM_MEASURE_IN_PROGRESS,
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NET_DIM_APPLY_NEW_PROFILE,
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};
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enum {
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NET_DIM_PARKING_ON_TOP,
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NET_DIM_PARKING_TIRED,
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NET_DIM_GOING_RIGHT,
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NET_DIM_GOING_LEFT,
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};
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enum {
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NET_DIM_STATS_WORSE,
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NET_DIM_STATS_SAME,
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NET_DIM_STATS_BETTER,
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};
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enum {
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NET_DIM_STEPPED,
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NET_DIM_TOO_TIRED,
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NET_DIM_ON_EDGE,
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};
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#define NET_DIM_PARAMS_NUM_PROFILES 5
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/* Adaptive moderation profiles */
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#define NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256
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#define NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE 128
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#define NET_DIM_DEF_PROFILE_CQE 1
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#define NET_DIM_DEF_PROFILE_EQE 1
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/* All profiles sizes must be NET_PARAMS_DIM_NUM_PROFILES */
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#define NET_DIM_RX_EQE_PROFILES { \
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{1, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{8, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{64, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{128, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{256, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
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}
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#define NET_DIM_RX_CQE_PROFILES { \
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{2, 256}, \
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{8, 128}, \
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{16, 64}, \
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{32, 64}, \
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{64, 64} \
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}
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#define NET_DIM_TX_EQE_PROFILES { \
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{1, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{8, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{32, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{64, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
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{128, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE} \
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}
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#define NET_DIM_TX_CQE_PROFILES { \
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{5, 128}, \
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{8, 64}, \
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{16, 32}, \
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{32, 32}, \
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{64, 32} \
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}
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static const struct net_dim_cq_moder
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rx_profile[NET_DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
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NET_DIM_RX_EQE_PROFILES,
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NET_DIM_RX_CQE_PROFILES,
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};
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static const struct net_dim_cq_moder
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tx_profile[NET_DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
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NET_DIM_TX_EQE_PROFILES,
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NET_DIM_TX_CQE_PROFILES,
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};
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static inline struct net_dim_cq_moder
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net_dim_get_rx_moderation(u8 cq_period_mode, int ix)
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{
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struct net_dim_cq_moder cq_moder = rx_profile[cq_period_mode][ix];
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cq_moder.cq_period_mode = cq_period_mode;
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return cq_moder;
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}
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static inline struct net_dim_cq_moder
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net_dim_get_def_rx_moderation(u8 cq_period_mode)
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{
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u8 profile_ix = cq_period_mode == NET_DIM_CQ_PERIOD_MODE_START_FROM_CQE ?
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NET_DIM_DEF_PROFILE_CQE : NET_DIM_DEF_PROFILE_EQE;
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return net_dim_get_rx_moderation(cq_period_mode, profile_ix);
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}
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static inline struct net_dim_cq_moder
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net_dim_get_tx_moderation(u8 cq_period_mode, int ix)
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{
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struct net_dim_cq_moder cq_moder = tx_profile[cq_period_mode][ix];
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cq_moder.cq_period_mode = cq_period_mode;
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return cq_moder;
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}
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static inline struct net_dim_cq_moder
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net_dim_get_def_tx_moderation(u8 cq_period_mode)
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{
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u8 profile_ix = cq_period_mode == NET_DIM_CQ_PERIOD_MODE_START_FROM_CQE ?
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NET_DIM_DEF_PROFILE_CQE : NET_DIM_DEF_PROFILE_EQE;
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return net_dim_get_tx_moderation(cq_period_mode, profile_ix);
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}
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static inline bool net_dim_on_top(struct net_dim *dim)
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{
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switch (dim->tune_state) {
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case NET_DIM_PARKING_ON_TOP:
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case NET_DIM_PARKING_TIRED:
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return true;
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case NET_DIM_GOING_RIGHT:
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return (dim->steps_left > 1) && (dim->steps_right == 1);
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default: /* NET_DIM_GOING_LEFT */
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return (dim->steps_right > 1) && (dim->steps_left == 1);
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}
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}
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static inline void net_dim_turn(struct net_dim *dim)
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{
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switch (dim->tune_state) {
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case NET_DIM_PARKING_ON_TOP:
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case NET_DIM_PARKING_TIRED:
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break;
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case NET_DIM_GOING_RIGHT:
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dim->tune_state = NET_DIM_GOING_LEFT;
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dim->steps_left = 0;
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break;
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case NET_DIM_GOING_LEFT:
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dim->tune_state = NET_DIM_GOING_RIGHT;
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dim->steps_right = 0;
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break;
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}
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}
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static inline int net_dim_step(struct net_dim *dim)
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{
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if (dim->tired == (NET_DIM_PARAMS_NUM_PROFILES * 2))
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return NET_DIM_TOO_TIRED;
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switch (dim->tune_state) {
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case NET_DIM_PARKING_ON_TOP:
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case NET_DIM_PARKING_TIRED:
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break;
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case NET_DIM_GOING_RIGHT:
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if (dim->profile_ix == (NET_DIM_PARAMS_NUM_PROFILES - 1))
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return NET_DIM_ON_EDGE;
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dim->profile_ix++;
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dim->steps_right++;
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break;
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case NET_DIM_GOING_LEFT:
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if (dim->profile_ix == 0)
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return NET_DIM_ON_EDGE;
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dim->profile_ix--;
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dim->steps_left++;
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break;
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}
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dim->tired++;
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return NET_DIM_STEPPED;
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}
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static inline void net_dim_park_on_top(struct net_dim *dim)
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{
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dim->steps_right = 0;
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dim->steps_left = 0;
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dim->tired = 0;
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dim->tune_state = NET_DIM_PARKING_ON_TOP;
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}
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static inline void net_dim_park_tired(struct net_dim *dim)
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{
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dim->steps_right = 0;
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dim->steps_left = 0;
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dim->tune_state = NET_DIM_PARKING_TIRED;
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}
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static inline void net_dim_exit_parking(struct net_dim *dim)
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{
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dim->tune_state = dim->profile_ix ? NET_DIM_GOING_LEFT :
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NET_DIM_GOING_RIGHT;
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net_dim_step(dim);
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}
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#define IS_SIGNIFICANT_DIFF(val, ref) \
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(((100UL * abs((val) - (ref))) / (ref)) > 10) /* more than 10% difference */
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static inline int net_dim_stats_compare(struct net_dim_stats *curr,
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struct net_dim_stats *prev)
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{
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if (!prev->bpms)
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return curr->bpms ? NET_DIM_STATS_BETTER :
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NET_DIM_STATS_SAME;
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if (IS_SIGNIFICANT_DIFF(curr->bpms, prev->bpms))
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return (curr->bpms > prev->bpms) ? NET_DIM_STATS_BETTER :
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NET_DIM_STATS_WORSE;
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if (!prev->ppms)
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return curr->ppms ? NET_DIM_STATS_BETTER :
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NET_DIM_STATS_SAME;
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if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms))
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return (curr->ppms > prev->ppms) ? NET_DIM_STATS_BETTER :
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NET_DIM_STATS_WORSE;
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if (!prev->epms)
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return NET_DIM_STATS_SAME;
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if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms))
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return (curr->epms < prev->epms) ? NET_DIM_STATS_BETTER :
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NET_DIM_STATS_WORSE;
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return NET_DIM_STATS_SAME;
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}
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static inline bool net_dim_decision(struct net_dim_stats *curr_stats,
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struct net_dim *dim)
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{
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int prev_state = dim->tune_state;
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int prev_ix = dim->profile_ix;
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int stats_res;
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int step_res;
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switch (dim->tune_state) {
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case NET_DIM_PARKING_ON_TOP:
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stats_res = net_dim_stats_compare(curr_stats, &dim->prev_stats);
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if (stats_res != NET_DIM_STATS_SAME)
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net_dim_exit_parking(dim);
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break;
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case NET_DIM_PARKING_TIRED:
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dim->tired--;
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if (!dim->tired)
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net_dim_exit_parking(dim);
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break;
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case NET_DIM_GOING_RIGHT:
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case NET_DIM_GOING_LEFT:
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stats_res = net_dim_stats_compare(curr_stats, &dim->prev_stats);
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if (stats_res != NET_DIM_STATS_BETTER)
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net_dim_turn(dim);
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if (net_dim_on_top(dim)) {
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net_dim_park_on_top(dim);
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break;
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}
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step_res = net_dim_step(dim);
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switch (step_res) {
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case NET_DIM_ON_EDGE:
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net_dim_park_on_top(dim);
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break;
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case NET_DIM_TOO_TIRED:
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net_dim_park_tired(dim);
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break;
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}
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break;
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}
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if ((prev_state != NET_DIM_PARKING_ON_TOP) ||
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(dim->tune_state != NET_DIM_PARKING_ON_TOP))
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dim->prev_stats = *curr_stats;
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return dim->profile_ix != prev_ix;
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}
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static inline void net_dim_sample(u16 event_ctr,
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u64 packets,
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u64 bytes,
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struct net_dim_sample *s)
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{
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s->time = ktime_get();
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s->pkt_ctr = packets;
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s->byte_ctr = bytes;
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s->event_ctr = event_ctr;
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}
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#define NET_DIM_NEVENTS 64
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#define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) & (BIT_ULL(bits) - 1))
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static inline void net_dim_calc_stats(struct net_dim_sample *start,
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struct net_dim_sample *end,
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struct net_dim_stats *curr_stats)
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{
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/* u32 holds up to 71 minutes, should be enough */
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u32 delta_us = ktime_us_delta(end->time, start->time);
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u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
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u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
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start->byte_ctr);
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if (!delta_us)
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return;
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curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
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curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
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curr_stats->epms = DIV_ROUND_UP(NET_DIM_NEVENTS * USEC_PER_MSEC,
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delta_us);
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}
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static inline void net_dim(struct net_dim *dim,
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struct net_dim_sample end_sample)
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{
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struct net_dim_stats curr_stats;
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u16 nevents;
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switch (dim->state) {
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case NET_DIM_MEASURE_IN_PROGRESS:
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nevents = BIT_GAP(BITS_PER_TYPE(u16),
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end_sample.event_ctr,
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dim->start_sample.event_ctr);
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if (nevents < NET_DIM_NEVENTS)
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break;
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net_dim_calc_stats(&dim->start_sample, &end_sample,
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&curr_stats);
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if (net_dim_decision(&curr_stats, dim)) {
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dim->state = NET_DIM_APPLY_NEW_PROFILE;
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schedule_work(&dim->work);
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break;
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}
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/* fall through */
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case NET_DIM_START_MEASURE:
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net_dim_sample(end_sample.event_ctr, end_sample.pkt_ctr, end_sample.byte_ctr,
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&dim->start_sample);
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dim->state = NET_DIM_MEASURE_IN_PROGRESS;
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break;
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case NET_DIM_APPLY_NEW_PROFILE:
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break;
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}
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}
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#endif /* NET_DIM_H */
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