mirror of
https://github.com/go-gitea/gitea
synced 2024-11-17 23:54:25 +00:00
398 lines
9.7 KiB
Go
Vendored
398 lines
9.7 KiB
Go
Vendored
//+build !noasm,!appengine,gc
|
|
|
|
// Copyright (c) 2020 MinIO Inc. All rights reserved.
|
|
// Use of this source code is governed by a license that can be
|
|
// found in the LICENSE file.
|
|
|
|
package md5simd
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"runtime"
|
|
"sync"
|
|
|
|
"github.com/klauspost/cpuid/v2"
|
|
)
|
|
|
|
// MD5 initialization constants
|
|
const (
|
|
// Lanes is the number of concurrently calculated hashes.
|
|
Lanes = 16
|
|
|
|
init0 = 0x67452301
|
|
init1 = 0xefcdab89
|
|
init2 = 0x98badcfe
|
|
init3 = 0x10325476
|
|
|
|
// Use scalar routine when below this many lanes
|
|
useScalarBelow = 3
|
|
)
|
|
|
|
// md5ServerUID - Does not start at 0 but next multiple of 16 so as to be able to
|
|
// differentiate with default initialisation value of 0
|
|
const md5ServerUID = Lanes
|
|
|
|
const buffersPerLane = 3
|
|
|
|
// Message to send across input channel
|
|
type blockInput struct {
|
|
uid uint64
|
|
msg []byte
|
|
sumCh chan sumResult
|
|
reset bool
|
|
}
|
|
|
|
type sumResult struct {
|
|
digest [Size]byte
|
|
}
|
|
|
|
type lanesInfo [Lanes]blockInput
|
|
|
|
// md5Server - Type to implement parallel handling of MD5 invocations
|
|
type md5Server struct {
|
|
uidCounter uint64
|
|
cycle chan uint64 // client with uid has update.
|
|
newInput chan newClient // Add new client.
|
|
digests map[uint64][Size]byte // Map of uids to (interim) digest results
|
|
maskRounds16 [16]maskRounds // Pre-allocated static array for max 16 rounds
|
|
maskRounds8a [8]maskRounds // Pre-allocated static array for max 8 rounds (1st AVX2 core)
|
|
maskRounds8b [8]maskRounds // Pre-allocated static array for max 8 rounds (2nd AVX2 core)
|
|
allBufs []byte // Preallocated buffer.
|
|
buffers chan []byte // Preallocated buffers, sliced from allBufs.
|
|
|
|
i8 [2][8][]byte // avx2 temporary vars
|
|
d8a, d8b digest8
|
|
wg sync.WaitGroup
|
|
}
|
|
|
|
// NewServer - Create new object for parallel processing handling
|
|
func NewServer() Server {
|
|
if !cpuid.CPU.Supports(cpuid.AVX2) {
|
|
return &fallbackServer{}
|
|
}
|
|
md5srv := &md5Server{}
|
|
md5srv.digests = make(map[uint64][Size]byte)
|
|
md5srv.newInput = make(chan newClient, Lanes)
|
|
md5srv.cycle = make(chan uint64, Lanes*10)
|
|
md5srv.uidCounter = md5ServerUID - 1
|
|
md5srv.allBufs = make([]byte, 32+buffersPerLane*Lanes*internalBlockSize)
|
|
md5srv.buffers = make(chan []byte, buffersPerLane*Lanes)
|
|
// Fill buffers.
|
|
for i := 0; i < buffersPerLane*Lanes; i++ {
|
|
s := 32 + i*internalBlockSize
|
|
md5srv.buffers <- md5srv.allBufs[s : s+internalBlockSize : s+internalBlockSize]
|
|
}
|
|
|
|
// Start a single thread for reading from the input channel
|
|
go md5srv.process(md5srv.newInput)
|
|
return md5srv
|
|
}
|
|
|
|
type newClient struct {
|
|
uid uint64
|
|
input chan blockInput
|
|
}
|
|
|
|
// process - Sole handler for reading from the input channel.
|
|
func (s *md5Server) process(newClients chan newClient) {
|
|
// To fill up as many lanes as possible:
|
|
//
|
|
// 1. Wait for a cycle id.
|
|
// 2. If not already in a lane, add, otherwise leave on channel
|
|
// 3. Start timer
|
|
// 4. Check if lanes is full, if so, goto 10 (process).
|
|
// 5. If timeout, goto 10.
|
|
// 6. Wait for new id (goto 2) or timeout (goto 10).
|
|
// 10. Process.
|
|
// 11. Check all input if there is already input, if so add to lanes.
|
|
// 12. Goto 1
|
|
|
|
// lanes contains the lanes.
|
|
var lanes lanesInfo
|
|
// lanesFilled contains the number of filled lanes for current cycle.
|
|
var lanesFilled int
|
|
// clients contains active clients
|
|
var clients = make(map[uint64]chan blockInput, Lanes)
|
|
|
|
addToLane := func(uid uint64) {
|
|
cl, ok := clients[uid]
|
|
if !ok {
|
|
// Unknown client. Maybe it was already removed.
|
|
return
|
|
}
|
|
// Check if we already have it.
|
|
for _, lane := range lanes[:lanesFilled] {
|
|
if lane.uid == uid {
|
|
return
|
|
}
|
|
}
|
|
// Continue until we get a block or there is nothing on channel
|
|
for {
|
|
select {
|
|
case block, ok := <-cl:
|
|
if !ok {
|
|
// Client disconnected
|
|
delete(clients, block.uid)
|
|
return
|
|
}
|
|
if block.uid != uid {
|
|
panic(fmt.Errorf("uid mismatch, %d (block) != %d (client)", block.uid, uid))
|
|
}
|
|
// If reset message, reset and we're done
|
|
if block.reset {
|
|
delete(s.digests, uid)
|
|
continue
|
|
}
|
|
|
|
// If requesting sum, we will need to maintain state.
|
|
if block.sumCh != nil {
|
|
var dig digest
|
|
d, ok := s.digests[uid]
|
|
if ok {
|
|
dig.s[0] = binary.LittleEndian.Uint32(d[0:4])
|
|
dig.s[1] = binary.LittleEndian.Uint32(d[4:8])
|
|
dig.s[2] = binary.LittleEndian.Uint32(d[8:12])
|
|
dig.s[3] = binary.LittleEndian.Uint32(d[12:16])
|
|
} else {
|
|
dig.s[0], dig.s[1], dig.s[2], dig.s[3] = init0, init1, init2, init3
|
|
}
|
|
|
|
sum := sumResult{}
|
|
// Add end block to current digest.
|
|
blockScalar(&dig.s, block.msg)
|
|
|
|
binary.LittleEndian.PutUint32(sum.digest[0:], dig.s[0])
|
|
binary.LittleEndian.PutUint32(sum.digest[4:], dig.s[1])
|
|
binary.LittleEndian.PutUint32(sum.digest[8:], dig.s[2])
|
|
binary.LittleEndian.PutUint32(sum.digest[12:], dig.s[3])
|
|
block.sumCh <- sum
|
|
if block.msg != nil {
|
|
s.buffers <- block.msg
|
|
}
|
|
continue
|
|
}
|
|
if len(block.msg) == 0 {
|
|
continue
|
|
}
|
|
lanes[lanesFilled] = block
|
|
lanesFilled++
|
|
return
|
|
default:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
addNewClient := func(cl newClient) {
|
|
if _, ok := clients[cl.uid]; ok {
|
|
panic("internal error: duplicate client registration")
|
|
}
|
|
clients[cl.uid] = cl.input
|
|
}
|
|
|
|
allLanesFilled := func() bool {
|
|
return lanesFilled == Lanes || lanesFilled >= len(clients)
|
|
}
|
|
|
|
for {
|
|
// Step 1.
|
|
for lanesFilled == 0 {
|
|
select {
|
|
case cl, ok := <-newClients:
|
|
if !ok {
|
|
return
|
|
}
|
|
addNewClient(cl)
|
|
// Check if it already sent a payload.
|
|
addToLane(cl.uid)
|
|
continue
|
|
case uid := <-s.cycle:
|
|
addToLane(uid)
|
|
}
|
|
}
|
|
|
|
fillLanes:
|
|
for !allLanesFilled() {
|
|
select {
|
|
case cl, ok := <-newClients:
|
|
if !ok {
|
|
return
|
|
}
|
|
addNewClient(cl)
|
|
|
|
case uid := <-s.cycle:
|
|
addToLane(uid)
|
|
default:
|
|
// Nothing more queued...
|
|
break fillLanes
|
|
}
|
|
}
|
|
|
|
// If we did not fill all lanes, check if there is more waiting
|
|
if !allLanesFilled() {
|
|
runtime.Gosched()
|
|
for uid := range clients {
|
|
addToLane(uid)
|
|
if allLanesFilled() {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
if false {
|
|
if !allLanesFilled() {
|
|
fmt.Println("Not all lanes filled", lanesFilled, "of", len(clients))
|
|
//pprof.Lookup("goroutine").WriteTo(os.Stdout, 1)
|
|
} else if true {
|
|
fmt.Println("all lanes filled")
|
|
}
|
|
}
|
|
// Process the lanes we could collect
|
|
s.blocks(lanes[:lanesFilled])
|
|
|
|
// Clear lanes...
|
|
lanesFilled = 0
|
|
// Add all current queued
|
|
for uid := range clients {
|
|
addToLane(uid)
|
|
if allLanesFilled() {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *md5Server) Close() {
|
|
if s.newInput != nil {
|
|
close(s.newInput)
|
|
s.newInput = nil
|
|
}
|
|
}
|
|
|
|
// Invoke assembly and send results back
|
|
func (s *md5Server) blocks(lanes []blockInput) {
|
|
if len(lanes) < useScalarBelow {
|
|
// Use scalar routine when below this many lanes
|
|
switch len(lanes) {
|
|
case 0:
|
|
case 1:
|
|
lane := lanes[0]
|
|
var d digest
|
|
a, ok := s.digests[lane.uid]
|
|
if ok {
|
|
d.s[0] = binary.LittleEndian.Uint32(a[0:4])
|
|
d.s[1] = binary.LittleEndian.Uint32(a[4:8])
|
|
d.s[2] = binary.LittleEndian.Uint32(a[8:12])
|
|
d.s[3] = binary.LittleEndian.Uint32(a[12:16])
|
|
} else {
|
|
d.s[0] = init0
|
|
d.s[1] = init1
|
|
d.s[2] = init2
|
|
d.s[3] = init3
|
|
}
|
|
if len(lane.msg) > 0 {
|
|
// Update...
|
|
blockScalar(&d.s, lane.msg)
|
|
}
|
|
dig := [Size]byte{}
|
|
binary.LittleEndian.PutUint32(dig[0:], d.s[0])
|
|
binary.LittleEndian.PutUint32(dig[4:], d.s[1])
|
|
binary.LittleEndian.PutUint32(dig[8:], d.s[2])
|
|
binary.LittleEndian.PutUint32(dig[12:], d.s[3])
|
|
s.digests[lane.uid] = dig
|
|
|
|
if lane.msg != nil {
|
|
s.buffers <- lane.msg
|
|
}
|
|
lanes[0] = blockInput{}
|
|
|
|
default:
|
|
s.wg.Add(len(lanes))
|
|
var results [useScalarBelow]digest
|
|
for i := range lanes {
|
|
lane := lanes[i]
|
|
go func(i int) {
|
|
var d digest
|
|
defer s.wg.Done()
|
|
a, ok := s.digests[lane.uid]
|
|
if ok {
|
|
d.s[0] = binary.LittleEndian.Uint32(a[0:4])
|
|
d.s[1] = binary.LittleEndian.Uint32(a[4:8])
|
|
d.s[2] = binary.LittleEndian.Uint32(a[8:12])
|
|
d.s[3] = binary.LittleEndian.Uint32(a[12:16])
|
|
} else {
|
|
d.s[0] = init0
|
|
d.s[1] = init1
|
|
d.s[2] = init2
|
|
d.s[3] = init3
|
|
}
|
|
if len(lane.msg) == 0 {
|
|
results[i] = d
|
|
return
|
|
}
|
|
// Update...
|
|
blockScalar(&d.s, lane.msg)
|
|
results[i] = d
|
|
}(i)
|
|
}
|
|
s.wg.Wait()
|
|
for i, lane := range lanes {
|
|
dig := [Size]byte{}
|
|
binary.LittleEndian.PutUint32(dig[0:], results[i].s[0])
|
|
binary.LittleEndian.PutUint32(dig[4:], results[i].s[1])
|
|
binary.LittleEndian.PutUint32(dig[8:], results[i].s[2])
|
|
binary.LittleEndian.PutUint32(dig[12:], results[i].s[3])
|
|
s.digests[lane.uid] = dig
|
|
|
|
if lane.msg != nil {
|
|
s.buffers <- lane.msg
|
|
}
|
|
lanes[i] = blockInput{}
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
inputs := [16][]byte{}
|
|
for i := range lanes {
|
|
inputs[i] = lanes[i].msg
|
|
}
|
|
|
|
// Collect active digests...
|
|
state := s.getDigests(lanes)
|
|
// Process all lanes...
|
|
s.blockMd5_x16(&state, inputs, len(lanes) <= 8)
|
|
|
|
for i, lane := range lanes {
|
|
uid := lane.uid
|
|
dig := [Size]byte{}
|
|
binary.LittleEndian.PutUint32(dig[0:], state.v0[i])
|
|
binary.LittleEndian.PutUint32(dig[4:], state.v1[i])
|
|
binary.LittleEndian.PutUint32(dig[8:], state.v2[i])
|
|
binary.LittleEndian.PutUint32(dig[12:], state.v3[i])
|
|
|
|
s.digests[uid] = dig
|
|
if lane.msg != nil {
|
|
s.buffers <- lane.msg
|
|
}
|
|
lanes[i] = blockInput{}
|
|
}
|
|
}
|
|
|
|
func (s *md5Server) getDigests(lanes []blockInput) (d digest16) {
|
|
for i, lane := range lanes {
|
|
a, ok := s.digests[lane.uid]
|
|
if ok {
|
|
d.v0[i] = binary.LittleEndian.Uint32(a[0:4])
|
|
d.v1[i] = binary.LittleEndian.Uint32(a[4:8])
|
|
d.v2[i] = binary.LittleEndian.Uint32(a[8:12])
|
|
d.v3[i] = binary.LittleEndian.Uint32(a[12:16])
|
|
} else {
|
|
d.v0[i] = init0
|
|
d.v1[i] = init1
|
|
d.v2[i] = init2
|
|
d.v3[i] = init3
|
|
}
|
|
}
|
|
return
|
|
}
|