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linux/dim: Move implementation to .c files
Moved all logic from dim.h and net_dim.h to dim.c and net_dim.c. This is both more structurally appealing and would allow to only expose externally used functions. Signed-off-by: Tal Gilboa <talgi@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
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@ -5588,8 +5588,8 @@ F: include/linux/dynamic_debug.h
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DYNAMIC INTERRUPT MODERATION
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M: Tal Gilboa <talgi@mellanox.com>
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S: Maintained
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F: include/linux/net_dim.h
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F: include/linux/dim.h
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F: lib/dim/
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DZ DECSTATION DZ11 SERIAL DRIVER
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M: "Maciej W. Rozycki" <macro@linux-mips.org>
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@ -8,6 +8,7 @@ config NET_VENDOR_BROADCOM
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default y
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depends on (SSB_POSSIBLE && HAS_DMA) || PCI || BCM63XX || \
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SIBYTE_SB1xxx_SOC
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select DIMLIB
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---help---
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If you have a network (Ethernet) chipset belonging to this class,
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say Y.
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@ -14,7 +14,7 @@
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#include <linux/bitmap.h>
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#include <linux/ethtool.h>
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#include <linux/if_vlan.h>
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#include <linux/net_dim.h>
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#include <linux/dim.h>
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/* Receive/transmit descriptor format */
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#define DESC_ADDR_HI_STATUS_LEN 0x00
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@ -23,7 +23,7 @@
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#include <net/devlink.h>
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#include <net/dst_metadata.h>
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#include <net/xdp.h>
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#include <linux/net_dim.h>
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#include <linux/dim.h>
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struct tx_bd {
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__le32 tx_bd_len_flags_type;
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@ -11,7 +11,7 @@
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#include <linux/module.h>
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#include <linux/pci.h>
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#include "bnxt_hsi.h"
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#include <linux/net_dim.h>
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#include <linux/dim.h>
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#include "bnxt.h"
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#include "bnxt_debugfs.h"
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@ -7,7 +7,7 @@
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* the Free Software Foundation.
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*/
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#include <linux/net_dim.h>
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#include <linux/dim.h>
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#include "bnxt_hsi.h"
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#include "bnxt.h"
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@ -16,7 +16,7 @@
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#include <linux/mii.h>
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#include <linux/if_vlan.h>
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#include <linux/phy.h>
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#include <linux/net_dim.h>
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#include <linux/dim.h>
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/* total number of Buffer Descriptors, same for Rx/Tx */
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#define TOTAL_DESC 256
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@ -34,6 +34,7 @@ config MLX5_CORE_EN
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depends on NETDEVICES && ETHERNET && INET && PCI && MLX5_CORE
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depends on IPV6=y || IPV6=n || MLX5_CORE=m
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select PAGE_POOL
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select DIMLIB
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default n
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---help---
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Ethernet support in Mellanox Technologies ConnectX-4 NIC.
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@ -48,7 +48,7 @@
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#include <linux/rhashtable.h>
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#include <net/switchdev.h>
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#include <net/xdp.h>
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#include <linux/net_dim.h>
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#include <linux/dim.h>
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#include <linux/bits.h>
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#include "wq.h"
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#include "mlx5_core.h"
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@ -30,7 +30,7 @@
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* SOFTWARE.
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*/
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#include <linux/net_dim.h>
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#include <linux/dim.h>
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#include "en.h"
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static void
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@ -6,20 +6,49 @@
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#include <linux/module.h>
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/**
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* Number of events between DIM iterations.
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* Causes a moderation of the algorithm run.
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*/
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#define DIM_NEVENTS 64
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/* more than 10% difference */
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/**
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* Is a difference between values justifies taking an action.
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* We consider 10% difference as significant.
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*/
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#define IS_SIGNIFICANT_DIFF(val, ref) \
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(((100UL * abs((val) - (ref))) / (ref)) > 10)
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#define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) \
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& (BIT_ULL(bits) - 1))
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/**
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* Calculate the gap between two values.
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* Take wrap-around and variable size into consideration.
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*/
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#define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) \
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& (BIT_ULL(bits) - 1))
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/**
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* Structure for CQ moderation values.
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* Used for communications between DIM and its consumer.
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*
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* @usec: CQ timer suggestion (by DIM)
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* @pkts: CQ packet counter suggestion (by DIM)
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* @cq_period_mode: CQ priod count mode (from CQE/EQE)
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*/
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struct 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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/**
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* Structure for DIM sample data.
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* Used for communications between DIM and its consumer.
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*
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* @time: Sample timestamp
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* @pkt_ctr: Number of packets
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* @byte_ctr: Number of bytes
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* @event_ctr: Number of events
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*/
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struct dim_sample {
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ktime_t time;
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u32 pkt_ctr;
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u16 event_ctr;
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};
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/**
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* Structure for DIM stats.
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* Used for holding current measured rates.
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*
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* @ppms: Packets per msec
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* @bpms: Bytes per msec
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* @epms: Events per msec
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*/
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struct 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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int ppms;
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int bpms;
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int epms;
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};
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struct dim { /* Dynamic Interrupt Moderation */
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/**
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* Main structure for dynamic interrupt moderation (DIM).
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* Used for holding all information about a specific DIM instance.
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*
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* @state: Algorithm state (see below)
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* @prev_stats: Measured rates from previous iteration (for comparison)
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* @start_sample: Sampled data at start of current iteration
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* @work: Work to perform on action required
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* @profile_ix: Current moderation profile
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* @mode: CQ period count mode
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* @tune_state: Algorithm tuning state (see below)
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* @steps_right: Number of steps taken towards higher moderation
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* @steps_left: Number of steps taken towards lower moderation
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* @tired: Parking depth counter
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*/
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struct dim {
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u8 state;
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struct dim_stats prev_stats;
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struct dim_sample start_sample;
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u8 tired;
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};
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/**
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* enum dim_cq_period_mode
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*
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* These are the modes for CQ period count.
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*
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* @DIM_CQ_PERIOD_MODE_START_FROM_EQE: Start counting from EQE
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* @DIM_CQ_PERIOD_MODE_START_FROM_CQE: Start counting from CQE (implies timer reset)
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* @DIM_CQ_PERIOD_NUM_MODES: Number of modes
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*/
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enum {
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DIM_CQ_PERIOD_MODE_START_FROM_EQE = 0x0,
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DIM_CQ_PERIOD_MODE_START_FROM_CQE = 0x1,
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DIM_CQ_PERIOD_NUM_MODES
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};
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/**
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* enum dim_state
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*
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* These are the DIM algorithm states.
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* These will determine if the algorithm is in a valid state to start an iteration.
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*
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* @DIM_START_MEASURE: This is the first iteration (also after applying a new profile)
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* @DIM_MEASURE_IN_PROGRESS: Algorithm is already in progress - check if
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* need to perform an action
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* @DIM_APPLY_NEW_PROFILE: DIM consumer is currently applying a profile - no need to measure
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*/
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enum {
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DIM_START_MEASURE,
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DIM_MEASURE_IN_PROGRESS,
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DIM_APPLY_NEW_PROFILE,
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};
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/**
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* enum dim_tune_state
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*
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* These are the DIM algorithm tune states.
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* These will determine which action the algorithm should perform.
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*
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* @DIM_PARKING_ON_TOP: Algorithm found a local top point - exit on significant difference
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* @DIM_PARKING_TIRED: Algorithm found a deep top point - don't exit if tired > 0
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* @DIM_GOING_RIGHT: Algorithm is currently trying higher moderation levels
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* @DIM_GOING_LEFT: Algorithm is currently trying lower moderation levels
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*/
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enum {
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DIM_PARKING_ON_TOP,
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DIM_PARKING_TIRED,
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DIM_GOING_LEFT,
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};
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/**
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* enum dim_stats_state
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*
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* These are the DIM algorithm statistics states.
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* These will determine the verdict of current iteration.
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*
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* @DIM_STATS_WORSE: Current iteration shows worse performance than before
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* @DIM_STATS_WORSE: Current iteration shows same performance than before
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* @DIM_STATS_WORSE: Current iteration shows better performance than before
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*/
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enum {
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DIM_STATS_WORSE,
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DIM_STATS_SAME,
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DIM_STATS_BETTER,
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};
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/**
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* enum dim_step_result
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*
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* These are the DIM algorithm step results.
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* These describe the result of a step.
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*
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* @DIM_STEPPED: Performed a regular step
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* @DIM_TOO_TIRED: Same kind of step was done multiple times - should go to
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* tired parking
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* @DIM_ON_EDGE: Stepped to the most left/right profile
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*/
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enum {
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DIM_STEPPED,
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DIM_TOO_TIRED,
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DIM_ON_EDGE,
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};
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static inline bool dim_on_top(struct dim *dim)
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{
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switch (dim->tune_state) {
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case DIM_PARKING_ON_TOP:
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case DIM_PARKING_TIRED:
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return true;
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case DIM_GOING_RIGHT:
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return (dim->steps_left > 1) && (dim->steps_right == 1);
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default: /* 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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/**
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* dim_on_top - check if current state is a good place to stop (top location)
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* @dim: DIM context
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*
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* Check if current profile is a good place to park at.
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* This will result in reducing the DIM checks frequency as we assume we
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* shouldn't probably change profiles, unless traffic pattern wasn't changed.
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*/
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bool dim_on_top(struct dim *dim);
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static inline void dim_turn(struct dim *dim)
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{
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switch (dim->tune_state) {
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case DIM_PARKING_ON_TOP:
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case DIM_PARKING_TIRED:
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break;
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case DIM_GOING_RIGHT:
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dim->tune_state = DIM_GOING_LEFT;
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dim->steps_left = 0;
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break;
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case DIM_GOING_LEFT:
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dim->tune_state = 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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/**
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* dim_turn - change profile alterning direction
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* @dim: DIM context
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*
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* Go left if we were going right and vice-versa.
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* Do nothing if currently parking.
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*/
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void dim_turn(struct dim *dim);
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static inline void dim_park_on_top(struct 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 = DIM_PARKING_ON_TOP;
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}
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/**
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* dim_park_on_top - enter a parking state on a top location
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* @dim: DIM context
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*
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* Enter parking state.
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* Clear all movement history.
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*/
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void dim_park_on_top(struct dim *dim);
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static inline void dim_park_tired(struct 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 = DIM_PARKING_TIRED;
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}
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/**
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* dim_park_tired - enter a tired parking state
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* @dim: DIM context
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*
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* Enter parking state.
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* Clear all movement history and cause DIM checks frequency to reduce.
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*/
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void dim_park_tired(struct dim *dim);
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/**
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* dim_calc_stats - calculate the difference between two samples
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* @start: start sample
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* @end: end sample
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* @curr_stats: delta between samples
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*
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* Calculate the delta between two samples (in data rates).
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* Takes into consideration counter wrap-around.
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*/
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void dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
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struct dim_stats *curr_stats);
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/**
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* dim_update_sample - set a sample's fields with give values
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* @event_ctr: number of events to set
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* @packets: number of packets to set
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* @bytes: number of bytes to set
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* @s: DIM sample
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*/
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static inline void
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dim_update_sample(u16 event_ctr, u64 packets, u64 bytes, struct dim_sample *s)
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{
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s->event_ctr = event_ctr;
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}
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static inline void
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dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
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struct 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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/* Net DIM */
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if (!delta_us)
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return;
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/*
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* Net DIM profiles:
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* There are different set of profiles for each CQ period mode.
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* There are different set of profiles for RX/TX CQs.
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* Each profile size must be of NET_DIM_PARAMS_NUM_PROFILES
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*/
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#define NET_DIM_PARAMS_NUM_PROFILES 5
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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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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(DIM_NEVENTS * USEC_PER_MSEC,
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delta_us);
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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 dim_cq_moder
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rx_profile[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 dim_cq_moder
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tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
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NET_DIM_TX_EQE_PROFILES,
|
||||
NET_DIM_TX_CQE_PROFILES,
|
||||
};
|
||||
|
||||
/**
|
||||
* net_dim_get_rx_moderation - provide a CQ moderation object for the given RX profile
|
||||
* @cq_period_mode: CQ period mode
|
||||
* @ix: Profile index
|
||||
*/
|
||||
struct dim_cq_moder net_dim_get_rx_moderation(u8 cq_period_mode, int ix);
|
||||
|
||||
/**
|
||||
* net_dim_get_def_rx_moderation - provide the default RX moderation
|
||||
* @cq_period_mode: CQ period mode
|
||||
*/
|
||||
struct dim_cq_moder net_dim_get_def_rx_moderation(u8 cq_period_mode);
|
||||
|
||||
/**
|
||||
* net_dim_get_tx_moderation - provide a CQ moderation object for the given TX profile
|
||||
* @cq_period_mode: CQ period mode
|
||||
* @ix: Profile index
|
||||
*/
|
||||
struct dim_cq_moder net_dim_get_tx_moderation(u8 cq_period_mode, int ix);
|
||||
|
||||
/**
|
||||
* net_dim_get_def_tx_moderation - provide the default TX moderation
|
||||
* @cq_period_mode: CQ period mode
|
||||
*/
|
||||
struct dim_cq_moder net_dim_get_def_tx_moderation(u8 cq_period_mode);
|
||||
|
||||
/**
|
||||
* net_dim - main DIM algorithm entry point
|
||||
* @dim: DIM instance information
|
||||
* @end_sample: Current data measurement
|
||||
*
|
||||
* Called by the consumer.
|
||||
* This is the main logic of the algorithm, where data is processed in order to decide on next
|
||||
* required action.
|
||||
*/
|
||||
void net_dim(struct dim *dim, struct dim_sample end_sample);
|
||||
|
||||
#endif /* DIM_H */
|
||||
|
|
|
@ -1,273 +0,0 @@
|
|||
/*
|
||||
* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
|
||||
* Copyright (c) 2017-2018, Broadcom Limited. All rights reserved.
|
||||
*
|
||||
* This software is available to you under a choice of one of two
|
||||
* licenses. You may choose to be licensed under the terms of the GNU
|
||||
* General Public License (GPL) Version 2, available from the file
|
||||
* COPYING in the main directory of this source tree, or the
|
||||
* OpenIB.org BSD license below:
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or
|
||||
* without modification, are permitted provided that the following
|
||||
* conditions are met:
|
||||
*
|
||||
* - Redistributions of source code must retain the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer.
|
||||
*
|
||||
* - Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials
|
||||
* provided with the distribution.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*/
|
||||
|
||||
#ifndef NET_DIM_H
|
||||
#define NET_DIM_H
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/dim.h>
|
||||
|
||||
#define NET_DIM_PARAMS_NUM_PROFILES 5
|
||||
/* Netdev dynamic interrupt moderation profiles */
|
||||
#define NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256
|
||||
#define NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE 128
|
||||
#define NET_DIM_DEF_PROFILE_CQE 1
|
||||
#define NET_DIM_DEF_PROFILE_EQE 1
|
||||
|
||||
/* All profiles sizes must be NET_PARAMS_DIM_NUM_PROFILES */
|
||||
#define NET_DIM_RX_EQE_PROFILES { \
|
||||
{1, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
{8, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
{64, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
{128, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
{256, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
}
|
||||
|
||||
#define NET_DIM_RX_CQE_PROFILES { \
|
||||
{2, 256}, \
|
||||
{8, 128}, \
|
||||
{16, 64}, \
|
||||
{32, 64}, \
|
||||
{64, 64} \
|
||||
}
|
||||
|
||||
#define NET_DIM_TX_EQE_PROFILES { \
|
||||
{1, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
{8, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
{32, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
{64, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
||||
{128, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE} \
|
||||
}
|
||||
|
||||
#define NET_DIM_TX_CQE_PROFILES { \
|
||||
{5, 128}, \
|
||||
{8, 64}, \
|
||||
{16, 32}, \
|
||||
{32, 32}, \
|
||||
{64, 32} \
|
||||
}
|
||||
|
||||
static const struct dim_cq_moder
|
||||
rx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
|
||||
NET_DIM_RX_EQE_PROFILES,
|
||||
NET_DIM_RX_CQE_PROFILES,
|
||||
};
|
||||
|
||||
static const struct dim_cq_moder
|
||||
tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
|
||||
NET_DIM_TX_EQE_PROFILES,
|
||||
NET_DIM_TX_CQE_PROFILES,
|
||||
};
|
||||
|
||||
static inline struct dim_cq_moder
|
||||
net_dim_get_rx_moderation(u8 cq_period_mode, int ix)
|
||||
{
|
||||
struct dim_cq_moder cq_moder = rx_profile[cq_period_mode][ix];
|
||||
|
||||
cq_moder.cq_period_mode = cq_period_mode;
|
||||
return cq_moder;
|
||||
}
|
||||
|
||||
static inline struct dim_cq_moder
|
||||
net_dim_get_def_rx_moderation(u8 cq_period_mode)
|
||||
{
|
||||
u8 profile_ix = cq_period_mode == DIM_CQ_PERIOD_MODE_START_FROM_CQE ?
|
||||
NET_DIM_DEF_PROFILE_CQE : NET_DIM_DEF_PROFILE_EQE;
|
||||
|
||||
return net_dim_get_rx_moderation(cq_period_mode, profile_ix);
|
||||
}
|
||||
|
||||
static inline struct dim_cq_moder
|
||||
net_dim_get_tx_moderation(u8 cq_period_mode, int ix)
|
||||
{
|
||||
struct dim_cq_moder cq_moder = tx_profile[cq_period_mode][ix];
|
||||
|
||||
cq_moder.cq_period_mode = cq_period_mode;
|
||||
return cq_moder;
|
||||
}
|
||||
|
||||
static inline struct dim_cq_moder
|
||||
net_dim_get_def_tx_moderation(u8 cq_period_mode)
|
||||
{
|
||||
u8 profile_ix = cq_period_mode == DIM_CQ_PERIOD_MODE_START_FROM_CQE ?
|
||||
NET_DIM_DEF_PROFILE_CQE : NET_DIM_DEF_PROFILE_EQE;
|
||||
|
||||
return net_dim_get_tx_moderation(cq_period_mode, profile_ix);
|
||||
}
|
||||
|
||||
static inline int net_dim_step(struct dim *dim)
|
||||
{
|
||||
if (dim->tired == (NET_DIM_PARAMS_NUM_PROFILES * 2))
|
||||
return DIM_TOO_TIRED;
|
||||
|
||||
switch (dim->tune_state) {
|
||||
case DIM_PARKING_ON_TOP:
|
||||
case DIM_PARKING_TIRED:
|
||||
break;
|
||||
case DIM_GOING_RIGHT:
|
||||
if (dim->profile_ix == (NET_DIM_PARAMS_NUM_PROFILES - 1))
|
||||
return DIM_ON_EDGE;
|
||||
dim->profile_ix++;
|
||||
dim->steps_right++;
|
||||
break;
|
||||
case DIM_GOING_LEFT:
|
||||
if (dim->profile_ix == 0)
|
||||
return DIM_ON_EDGE;
|
||||
dim->profile_ix--;
|
||||
dim->steps_left++;
|
||||
break;
|
||||
}
|
||||
|
||||
dim->tired++;
|
||||
return DIM_STEPPED;
|
||||
}
|
||||
|
||||
static inline void net_dim_exit_parking(struct dim *dim)
|
||||
{
|
||||
dim->tune_state = dim->profile_ix ? DIM_GOING_LEFT :
|
||||
DIM_GOING_RIGHT;
|
||||
net_dim_step(dim);
|
||||
}
|
||||
|
||||
static inline int net_dim_stats_compare(struct dim_stats *curr,
|
||||
struct dim_stats *prev)
|
||||
{
|
||||
if (!prev->bpms)
|
||||
return curr->bpms ? DIM_STATS_BETTER :
|
||||
DIM_STATS_SAME;
|
||||
|
||||
if (IS_SIGNIFICANT_DIFF(curr->bpms, prev->bpms))
|
||||
return (curr->bpms > prev->bpms) ? DIM_STATS_BETTER :
|
||||
DIM_STATS_WORSE;
|
||||
|
||||
if (!prev->ppms)
|
||||
return curr->ppms ? DIM_STATS_BETTER :
|
||||
DIM_STATS_SAME;
|
||||
|
||||
if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms))
|
||||
return (curr->ppms > prev->ppms) ? DIM_STATS_BETTER :
|
||||
DIM_STATS_WORSE;
|
||||
|
||||
if (!prev->epms)
|
||||
return DIM_STATS_SAME;
|
||||
|
||||
if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms))
|
||||
return (curr->epms < prev->epms) ? DIM_STATS_BETTER :
|
||||
DIM_STATS_WORSE;
|
||||
|
||||
return DIM_STATS_SAME;
|
||||
}
|
||||
|
||||
static inline bool net_dim_decision(struct dim_stats *curr_stats,
|
||||
struct dim *dim)
|
||||
{
|
||||
int prev_state = dim->tune_state;
|
||||
int prev_ix = dim->profile_ix;
|
||||
int stats_res;
|
||||
int step_res;
|
||||
|
||||
switch (dim->tune_state) {
|
||||
case DIM_PARKING_ON_TOP:
|
||||
stats_res = net_dim_stats_compare(curr_stats, &dim->prev_stats);
|
||||
if (stats_res != DIM_STATS_SAME)
|
||||
net_dim_exit_parking(dim);
|
||||
break;
|
||||
|
||||
case DIM_PARKING_TIRED:
|
||||
dim->tired--;
|
||||
if (!dim->tired)
|
||||
net_dim_exit_parking(dim);
|
||||
break;
|
||||
|
||||
case DIM_GOING_RIGHT:
|
||||
case DIM_GOING_LEFT:
|
||||
stats_res = net_dim_stats_compare(curr_stats, &dim->prev_stats);
|
||||
if (stats_res != DIM_STATS_BETTER)
|
||||
dim_turn(dim);
|
||||
|
||||
if (dim_on_top(dim)) {
|
||||
dim_park_on_top(dim);
|
||||
break;
|
||||
}
|
||||
|
||||
step_res = net_dim_step(dim);
|
||||
switch (step_res) {
|
||||
case DIM_ON_EDGE:
|
||||
dim_park_on_top(dim);
|
||||
break;
|
||||
case DIM_TOO_TIRED:
|
||||
dim_park_tired(dim);
|
||||
break;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
if (prev_state != DIM_PARKING_ON_TOP ||
|
||||
dim->tune_state != DIM_PARKING_ON_TOP)
|
||||
dim->prev_stats = *curr_stats;
|
||||
|
||||
return dim->profile_ix != prev_ix;
|
||||
}
|
||||
|
||||
static inline void net_dim(struct dim *dim,
|
||||
struct dim_sample end_sample)
|
||||
{
|
||||
struct dim_stats curr_stats;
|
||||
u16 nevents;
|
||||
|
||||
switch (dim->state) {
|
||||
case DIM_MEASURE_IN_PROGRESS:
|
||||
nevents = BIT_GAP(BITS_PER_TYPE(u16),
|
||||
end_sample.event_ctr,
|
||||
dim->start_sample.event_ctr);
|
||||
if (nevents < DIM_NEVENTS)
|
||||
break;
|
||||
dim_calc_stats(&dim->start_sample, &end_sample, &curr_stats);
|
||||
if (net_dim_decision(&curr_stats, dim)) {
|
||||
dim->state = DIM_APPLY_NEW_PROFILE;
|
||||
schedule_work(&dim->work);
|
||||
break;
|
||||
}
|
||||
/* fall through */
|
||||
case DIM_START_MEASURE:
|
||||
dim_update_sample(end_sample.event_ctr, end_sample.pkt_ctr,
|
||||
end_sample.byte_ctr, &dim->start_sample);
|
||||
dim->state = DIM_MEASURE_IN_PROGRESS;
|
||||
break;
|
||||
case DIM_APPLY_NEW_PROFILE:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
#endif /* NET_DIM_H */
|
|
@ -562,6 +562,14 @@ config SIGNATURE
|
|||
Digital signature verification. Currently only RSA is supported.
|
||||
Implementation is done using GnuPG MPI library
|
||||
|
||||
config DIMLIB
|
||||
bool "DIM library"
|
||||
default y
|
||||
help
|
||||
Dynamic Interrupt Moderation library.
|
||||
Implements an algorithm for dynamically change CQ modertion values
|
||||
according to run time performance.
|
||||
|
||||
#
|
||||
# libfdt files, only selected if needed.
|
||||
#
|
||||
|
|
|
@ -202,6 +202,7 @@ obj-$(CONFIG_GLOB) += glob.o
|
|||
obj-$(CONFIG_GLOB_SELFTEST) += globtest.o
|
||||
|
||||
obj-$(CONFIG_MPILIB) += mpi/
|
||||
obj-$(CONFIG_DIMLIB) += dim/
|
||||
obj-$(CONFIG_SIGNATURE) += digsig.o
|
||||
|
||||
lib-$(CONFIG_CLZ_TAB) += clz_tab.o
|
||||
|
|
9
lib/dim/Makefile
Normal file
9
lib/dim/Makefile
Normal file
|
@ -0,0 +1,9 @@
|
|||
#
|
||||
# DIM Dynamic Interrupt Moderation library
|
||||
#
|
||||
|
||||
obj-$(CONFIG_DIMLIB) = net_dim.o
|
||||
|
||||
net_dim-y = \
|
||||
dim.o \
|
||||
net_dim.o
|
74
lib/dim/dim.c
Normal file
74
lib/dim/dim.c
Normal file
|
@ -0,0 +1,74 @@
|
|||
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
|
||||
/*
|
||||
* Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
|
||||
*/
|
||||
|
||||
#include <linux/dim.h>
|
||||
|
||||
bool dim_on_top(struct dim *dim)
|
||||
{
|
||||
switch (dim->tune_state) {
|
||||
case DIM_PARKING_ON_TOP:
|
||||
case DIM_PARKING_TIRED:
|
||||
return true;
|
||||
case DIM_GOING_RIGHT:
|
||||
return (dim->steps_left > 1) && (dim->steps_right == 1);
|
||||
default: /* DIM_GOING_LEFT */
|
||||
return (dim->steps_right > 1) && (dim->steps_left == 1);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(dim_on_top);
|
||||
|
||||
void dim_turn(struct dim *dim)
|
||||
{
|
||||
switch (dim->tune_state) {
|
||||
case DIM_PARKING_ON_TOP:
|
||||
case DIM_PARKING_TIRED:
|
||||
break;
|
||||
case DIM_GOING_RIGHT:
|
||||
dim->tune_state = DIM_GOING_LEFT;
|
||||
dim->steps_left = 0;
|
||||
break;
|
||||
case DIM_GOING_LEFT:
|
||||
dim->tune_state = DIM_GOING_RIGHT;
|
||||
dim->steps_right = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(dim_turn);
|
||||
|
||||
void dim_park_on_top(struct dim *dim)
|
||||
{
|
||||
dim->steps_right = 0;
|
||||
dim->steps_left = 0;
|
||||
dim->tired = 0;
|
||||
dim->tune_state = DIM_PARKING_ON_TOP;
|
||||
}
|
||||
EXPORT_SYMBOL(dim_park_on_top);
|
||||
|
||||
void dim_park_tired(struct dim *dim)
|
||||
{
|
||||
dim->steps_right = 0;
|
||||
dim->steps_left = 0;
|
||||
dim->tune_state = DIM_PARKING_TIRED;
|
||||
}
|
||||
EXPORT_SYMBOL(dim_park_tired);
|
||||
|
||||
void dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
|
||||
struct dim_stats *curr_stats)
|
||||
{
|
||||
/* u32 holds up to 71 minutes, should be enough */
|
||||
u32 delta_us = ktime_us_delta(end->time, start->time);
|
||||
u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
|
||||
u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
|
||||
start->byte_ctr);
|
||||
|
||||
if (!delta_us)
|
||||
return;
|
||||
|
||||
curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
|
||||
curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
|
||||
curr_stats->epms = DIV_ROUND_UP(DIM_NEVENTS * USEC_PER_MSEC,
|
||||
delta_us);
|
||||
}
|
||||
EXPORT_SYMBOL(dim_calc_stats);
|
190
lib/dim/net_dim.c
Normal file
190
lib/dim/net_dim.c
Normal file
|
@ -0,0 +1,190 @@
|
|||
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
|
||||
/*
|
||||
* Copyright (c) 2018, Mellanox Technologies inc. All rights reserved.
|
||||
*/
|
||||
|
||||
#include <linux/dim.h>
|
||||
|
||||
struct dim_cq_moder
|
||||
net_dim_get_rx_moderation(u8 cq_period_mode, int ix)
|
||||
{
|
||||
struct dim_cq_moder cq_moder = rx_profile[cq_period_mode][ix];
|
||||
|
||||
cq_moder.cq_period_mode = cq_period_mode;
|
||||
return cq_moder;
|
||||
}
|
||||
EXPORT_SYMBOL(net_dim_get_rx_moderation);
|
||||
|
||||
struct dim_cq_moder
|
||||
net_dim_get_def_rx_moderation(u8 cq_period_mode)
|
||||
{
|
||||
u8 profile_ix = cq_period_mode == DIM_CQ_PERIOD_MODE_START_FROM_CQE ?
|
||||
NET_DIM_DEF_PROFILE_CQE : NET_DIM_DEF_PROFILE_EQE;
|
||||
|
||||
return net_dim_get_rx_moderation(cq_period_mode, profile_ix);
|
||||
}
|
||||
EXPORT_SYMBOL(net_dim_get_def_rx_moderation);
|
||||
|
||||
struct dim_cq_moder
|
||||
net_dim_get_tx_moderation(u8 cq_period_mode, int ix)
|
||||
{
|
||||
struct dim_cq_moder cq_moder = tx_profile[cq_period_mode][ix];
|
||||
|
||||
cq_moder.cq_period_mode = cq_period_mode;
|
||||
return cq_moder;
|
||||
}
|
||||
EXPORT_SYMBOL(net_dim_get_tx_moderation);
|
||||
|
||||
struct dim_cq_moder
|
||||
net_dim_get_def_tx_moderation(u8 cq_period_mode)
|
||||
{
|
||||
u8 profile_ix = cq_period_mode == DIM_CQ_PERIOD_MODE_START_FROM_CQE ?
|
||||
NET_DIM_DEF_PROFILE_CQE : NET_DIM_DEF_PROFILE_EQE;
|
||||
|
||||
return net_dim_get_tx_moderation(cq_period_mode, profile_ix);
|
||||
}
|
||||
EXPORT_SYMBOL(net_dim_get_def_tx_moderation);
|
||||
|
||||
static int net_dim_step(struct dim *dim)
|
||||
{
|
||||
if (dim->tired == (NET_DIM_PARAMS_NUM_PROFILES * 2))
|
||||
return DIM_TOO_TIRED;
|
||||
|
||||
switch (dim->tune_state) {
|
||||
case DIM_PARKING_ON_TOP:
|
||||
case DIM_PARKING_TIRED:
|
||||
break;
|
||||
case DIM_GOING_RIGHT:
|
||||
if (dim->profile_ix == (NET_DIM_PARAMS_NUM_PROFILES - 1))
|
||||
return DIM_ON_EDGE;
|
||||
dim->profile_ix++;
|
||||
dim->steps_right++;
|
||||
break;
|
||||
case DIM_GOING_LEFT:
|
||||
if (dim->profile_ix == 0)
|
||||
return DIM_ON_EDGE;
|
||||
dim->profile_ix--;
|
||||
dim->steps_left++;
|
||||
break;
|
||||
}
|
||||
|
||||
dim->tired++;
|
||||
return DIM_STEPPED;
|
||||
}
|
||||
|
||||
static void net_dim_exit_parking(struct dim *dim)
|
||||
{
|
||||
dim->tune_state = dim->profile_ix ? DIM_GOING_LEFT : DIM_GOING_RIGHT;
|
||||
net_dim_step(dim);
|
||||
}
|
||||
|
||||
static int net_dim_stats_compare(struct dim_stats *curr,
|
||||
struct dim_stats *prev)
|
||||
{
|
||||
if (!prev->bpms)
|
||||
return curr->bpms ? DIM_STATS_BETTER : DIM_STATS_SAME;
|
||||
|
||||
if (IS_SIGNIFICANT_DIFF(curr->bpms, prev->bpms))
|
||||
return (curr->bpms > prev->bpms) ? DIM_STATS_BETTER :
|
||||
DIM_STATS_WORSE;
|
||||
|
||||
if (!prev->ppms)
|
||||
return curr->ppms ? DIM_STATS_BETTER :
|
||||
DIM_STATS_SAME;
|
||||
|
||||
if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms))
|
||||
return (curr->ppms > prev->ppms) ? DIM_STATS_BETTER :
|
||||
DIM_STATS_WORSE;
|
||||
|
||||
if (!prev->epms)
|
||||
return DIM_STATS_SAME;
|
||||
|
||||
if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms))
|
||||
return (curr->epms < prev->epms) ? DIM_STATS_BETTER :
|
||||
DIM_STATS_WORSE;
|
||||
|
||||
return DIM_STATS_SAME;
|
||||
}
|
||||
|
||||
static bool net_dim_decision(struct dim_stats *curr_stats, struct dim *dim)
|
||||
{
|
||||
int prev_state = dim->tune_state;
|
||||
int prev_ix = dim->profile_ix;
|
||||
int stats_res;
|
||||
int step_res;
|
||||
|
||||
switch (dim->tune_state) {
|
||||
case DIM_PARKING_ON_TOP:
|
||||
stats_res = net_dim_stats_compare(curr_stats,
|
||||
&dim->prev_stats);
|
||||
if (stats_res != DIM_STATS_SAME)
|
||||
net_dim_exit_parking(dim);
|
||||
break;
|
||||
|
||||
case DIM_PARKING_TIRED:
|
||||
dim->tired--;
|
||||
if (!dim->tired)
|
||||
net_dim_exit_parking(dim);
|
||||
break;
|
||||
|
||||
case DIM_GOING_RIGHT:
|
||||
case DIM_GOING_LEFT:
|
||||
stats_res = net_dim_stats_compare(curr_stats,
|
||||
&dim->prev_stats);
|
||||
if (stats_res != DIM_STATS_BETTER)
|
||||
dim_turn(dim);
|
||||
|
||||
if (dim_on_top(dim)) {
|
||||
dim_park_on_top(dim);
|
||||
break;
|
||||
}
|
||||
|
||||
step_res = net_dim_step(dim);
|
||||
switch (step_res) {
|
||||
case DIM_ON_EDGE:
|
||||
dim_park_on_top(dim);
|
||||
break;
|
||||
case DIM_TOO_TIRED:
|
||||
dim_park_tired(dim);
|
||||
break;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
if (prev_state != DIM_PARKING_ON_TOP ||
|
||||
dim->tune_state != DIM_PARKING_ON_TOP)
|
||||
dim->prev_stats = *curr_stats;
|
||||
|
||||
return dim->profile_ix != prev_ix;
|
||||
}
|
||||
|
||||
void net_dim(struct dim *dim, struct dim_sample end_sample)
|
||||
{
|
||||
struct dim_stats curr_stats;
|
||||
u16 nevents;
|
||||
|
||||
switch (dim->state) {
|
||||
case DIM_MEASURE_IN_PROGRESS:
|
||||
nevents = BIT_GAP(BITS_PER_TYPE(u16),
|
||||
end_sample.event_ctr,
|
||||
dim->start_sample.event_ctr);
|
||||
if (nevents < DIM_NEVENTS)
|
||||
break;
|
||||
dim_calc_stats(&dim->start_sample, &end_sample, &curr_stats);
|
||||
if (net_dim_decision(&curr_stats, dim)) {
|
||||
dim->state = DIM_APPLY_NEW_PROFILE;
|
||||
schedule_work(&dim->work);
|
||||
break;
|
||||
}
|
||||
/* fall through */
|
||||
case DIM_START_MEASURE:
|
||||
dim_update_sample(end_sample.event_ctr, end_sample.pkt_ctr,
|
||||
end_sample.byte_ctr, &dim->start_sample);
|
||||
dim->state = DIM_MEASURE_IN_PROGRESS;
|
||||
break;
|
||||
case DIM_APPLY_NEW_PROFILE:
|
||||
break;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(net_dim);
|
Loading…
Reference in a new issue