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net/art: allow non-pointers as values

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Values are still turned into pointers internally to maintain the
invariants of strideTable, but from the user's perspective it's
now possible to tbl.Insert(pfx, true) rather than
tbl.Insert(pfx, ptr.To(true)).

Updates #7781

Signed-off-by: David Anderson <danderson@tailscale.com>
pull/8937/head
David Anderson 1 year ago committed by Dave Anderson
parent bc0eb6b914
commit e92adfe5e4
4 changed files with 246 additions and 220 deletions
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152
net/art/stride_table.go
Unescape Escape View File

@ -18,19 +18,6 @@ const (
debugStrideDelete = false debugStrideDelete = false
) )
// strideEntry is a strideTable entry.
type strideEntry[T any] struct {
// prefixIndex is the prefixIndex(...) value that caused this stride entry's
// value to be populated, or 0 if value is nil.
//
// We need to keep track of this because allot() uses it to determine
// whether an entry was propagated from a parent entry, or if it's a
// different independent route.
prefixIndex int
// value is the value associated with the strideEntry, if any.
value *T
}
// strideTable is a binary tree that implements an 8-bit routing table. // strideTable is a binary tree that implements an 8-bit routing table.
// //
// The leaves of the binary tree are host routes (/8s). Each parent is a // The leaves of the binary tree are host routes (/8s). Each parent is a
@ -54,7 +41,9 @@ type strideTable[T any] struct {
// paper, it's hijacked through sneaky C memory trickery to store // paper, it's hijacked through sneaky C memory trickery to store
// the refcount, but this is Go, where we don't store random bits // the refcount, but this is Go, where we don't store random bits
// in pointers lest we confuse the GC) // in pointers lest we confuse the GC)
entries [lastHostIndex + 1]strideEntry[T] //
// A nil value means no route matches the queried route.
entries [lastHostIndex + 1]*T
// children are the child tables of this table. Each child // children are the child tables of this table. Each child
// represents the address space within one of this table's host // represents the address space within one of this table's host
// routes (/8). // routes (/8).
@ -112,13 +101,6 @@ func (t *strideTable[T]) getOrCreateChild(addr uint8) (child *strideTable[T], cr
return ret, false return ret, false
} }
// getValAndChild returns both the prefix and child strideTable for
// addr. Both returned values can be nil if no entry of that type
// exists for addr.
func (t *strideTable[T]) getValAndChild(addr uint8) (*T, *strideTable[T]) {
return t.entries[hostIndex(addr)].value, t.children[addr]
}
// findFirstChild returns the first child strideTable in t, or nil if // findFirstChild returns the first child strideTable in t, or nil if
// t has no children. // t has no children.
func (t *strideTable[T]) findFirstChild() *strideTable[T] { func (t *strideTable[T]) findFirstChild() *strideTable[T] {
@ -130,21 +112,41 @@ func (t *strideTable[T]) findFirstChild() *strideTable[T] {
return nil return nil
} }
// hasPrefixRootedAt reports whether t.entries[idx] is the root node of
// a prefix.
func (t *strideTable[T]) hasPrefixRootedAt(idx int) bool {
val := t.entries[idx]
if val == nil {
return false
}
parentIdx := parentIndex(idx)
if parentIdx == 0 {
// idx is non-nil, and is at the 0/0 route position.
return true
}
if parent := t.entries[parentIdx]; val != parent {
// parent node in the tree isn't the same prefix, so idx must
// be a root.
return true
}
return false
}
// allot updates entries whose stored prefixIndex matches oldPrefixIndex, in the // allot updates entries whose stored prefixIndex matches oldPrefixIndex, in the
// subtree rooted at idx. Matching entries have their stored prefixIndex set to // subtree rooted at idx. Matching entries have their stored prefixIndex set to
// newPrefixIndex, and their value set to val. // newPrefixIndex, and their value set to val.
// //
// allot is the core of the ART algorithm, enabling efficient insertion/deletion // allot is the core of the ART algorithm, enabling efficient insertion/deletion
// while preserving very fast lookups. // while preserving very fast lookups.
func (t *strideTable[T]) allot(idx int, oldPrefixIndex, newPrefixIndex int, val *T) { func (t *strideTable[T]) allot(idx int, old, new *T) {
if t.entries[idx].prefixIndex != oldPrefixIndex { if t.entries[idx] != old {
// current prefixIndex isn't what we expect. This is a recursive call // current idx isn't what we expect. This is a recursive call
// that found a child subtree that already has a more specific route // that found a child subtree that already has a more specific
// installed. Don't touch it. // route installed. Don't touch it.
return return
} }
t.entries[idx].value = val t.entries[idx] = new
t.entries[idx].prefixIndex = newPrefixIndex
if idx >= firstHostIndex { if idx >= firstHostIndex {
// The entry we just updated was a host route, we're at the bottom of // The entry we just updated was a host route, we're at the bottom of
// the binary tree. // the binary tree.
@ -152,51 +154,73 @@ func (t *strideTable[T]) allot(idx int, oldPrefixIndex, newPrefixIndex int, val
} }
// Propagate the allotment to this node's children. // Propagate the allotment to this node's children.
left := idx << 1 left := idx << 1
t.allot(left, oldPrefixIndex, newPrefixIndex, val) t.allot(left, old, new)
right := left + 1 right := left + 1
t.allot(right, oldPrefixIndex, newPrefixIndex, val) t.allot(right, old, new)
} }
// insert adds the route addr/prefixLen to t, with value val. // insert adds the route addr/prefixLen to t, with value val.
func (t *strideTable[T]) insert(addr uint8, prefixLen int, val *T) { func (t *strideTable[T]) insert(addr uint8, prefixLen int, val T) {
idx := prefixIndex(addr, prefixLen) idx := prefixIndex(addr, prefixLen)
old := t.entries[idx].value if !t.hasPrefixRootedAt(idx) {
oldIdx := t.entries[idx].prefixIndex // This route entry is being freshly created (not just
if oldIdx == idx && old == val { // updated), that's a new reference.
// This exact prefix+value is already in the table.
return
}
t.allot(idx, oldIdx, idx, val)
if oldIdx != idx {
// This route entry was freshly created (not just updated), that's a new
// reference.
t.routeRefs++ t.routeRefs++
} }
old := t.entries[idx]
// For allot to work correctly, each distinct prefix in the
// strideTable must have a different value pointer, even if val is
// identical. This new()+assignment guarantees that each inserted
// prefix gets a unique address.
p := new(T)
*p = val
t.allot(idx, old, p)
return return
} }
// delete removes the route addr/prefixLen from t. Returns the value // delete removes the route addr/prefixLen from t. Reports whether the
// that was associated with the deleted prefix, or nil if the prefix // prefix existed in the table prior to deletion.
// wasn't in the strideTable. func (t *strideTable[T]) delete(addr uint8, prefixLen int) (wasPresent bool) {
func (t *strideTable[T]) delete(addr uint8, prefixLen int) *T {
idx := prefixIndex(addr, prefixLen) idx := prefixIndex(addr, prefixLen)
recordedIdx := t.entries[idx].prefixIndex if !t.hasPrefixRootedAt(idx) {
if recordedIdx != idx {
// Route entry doesn't exist // Route entry doesn't exist
return nil return false
} }
val := t.entries[idx].value
parentIdx := idx >> 1 val := t.entries[idx]
t.allot(idx, idx, t.entries[parentIdx].prefixIndex, t.entries[parentIdx].value) var parentVal *T
if parentIdx := parentIndex(idx); parentIdx != 0 {
parentVal = t.entries[parentIdx]
}
t.allot(idx, val, parentVal)
t.routeRefs-- t.routeRefs--
return val return true
} }
// get does a route lookup for addr and returns the associated value, or nil if // get does a route lookup for addr and (value, true) if a matching
// no route matched. // route exists, or (zero, false) otherwise.
func (t *strideTable[T]) get(addr uint8) *T { func (t *strideTable[T]) get(addr uint8) (ret T, ok bool) {
return t.entries[hostIndex(addr)].value if val := t.entries[hostIndex(addr)]; val != nil {
return *val, true
}
return ret, false
}
// getValAndChild returns both the prefix value and child strideTable
// for addr. valOK reports whether a prefix value exists for addr, and
// child is non-nil if a child exists for addr.
func (t *strideTable[T]) getValAndChild(addr uint8) (val T, valOK bool, child *strideTable[T]) {
vp := t.entries[hostIndex(addr)]
if vp != nil {
val = *vp
valOK = true
}
child = t.children[addr]
return
} }
// TableDebugString returns the contents of t, formatted as a table with one // TableDebugString returns the contents of t, formatted as a table with one
@ -208,10 +232,10 @@ func (t *strideTable[T]) tableDebugString() string {
continue continue
} }
v := "(nil)" v := "(nil)"
if ent.value != nil { if ent != nil {
v = fmt.Sprint(*ent.value) v = fmt.Sprint(*ent)
} }
fmt.Fprintf(&ret, "idx=%3d (%s), parent=%3d (%s), val=%v\n", i, formatPrefixTable(inversePrefixIndex(i)), ent.prefixIndex, formatPrefixTable(inversePrefixIndex((ent.prefixIndex))), v) fmt.Fprintf(&ret, "idx=%3d (%s), val=%v\n", i, formatPrefixTable(inversePrefixIndex(i)), v)
} }
return ret.String() return ret.String()
} }
@ -227,8 +251,8 @@ func (t *strideTable[T]) treeDebugString() string {
func (t *strideTable[T]) treeDebugStringRec(w io.Writer, idx, indent int) { func (t *strideTable[T]) treeDebugStringRec(w io.Writer, idx, indent int) {
addr, len := inversePrefixIndex(idx) addr, len := inversePrefixIndex(idx)
if t.entries[idx].prefixIndex != 0 && t.entries[idx].prefixIndex == idx { if t.hasPrefixRootedAt(idx) {
fmt.Fprintf(w, "%s%d/%d (%02x/%d) = %v\n", strings.Repeat(" ", indent), addr, len, addr, len, *t.entries[idx].value) fmt.Fprintf(w, "%s%d/%d (%02x/%d) = %v\n", strings.Repeat(" ", indent), addr, len, addr, len, *t.entries[idx])
indent += 2 indent += 2
} }
if idx >= firstHostIndex { if idx >= firstHostIndex {
@ -251,6 +275,12 @@ func prefixIndex(addr uint8, prefixLen int) int {
return (int(addr) >> (8 - prefixLen)) + (1 << prefixLen) return (int(addr) >> (8 - prefixLen)) + (1 << prefixLen)
} }
// parentIndex returns the index of idx's parent prefix, or 0 if idx
// is the index of 0/0.
func parentIndex(idx int) int {
return idx >> 1
}
// hostIndex returns the array index of the host route for addr. // hostIndex returns the array index of the host route for addr.
// It is equivalent to prefixIndex(addr, 8). // It is equivalent to prefixIndex(addr, 8).
func hostIndex(addr uint8) int { func hostIndex(addr uint8) int {

105
net/art/stride_table_test.go
Unescape Escape View File

@ -8,12 +8,12 @@ import (
"fmt" "fmt"
"math/rand" "math/rand"
"net/netip" "net/netip"
"runtime"
"sort" "sort"
"strings" "strings"
"testing" "testing"
"github.com/google/go-cmp/cmp" "github.com/google/go-cmp/cmp"
"tailscale.com/types/ptr"
) )
func TestInversePrefix(t *testing.T) { func TestInversePrefix(t *testing.T) {
@ -65,10 +65,10 @@ func TestStrideTableInsert(t *testing.T) {
for i := 0; i < 256; i++ { for i := 0; i < 256; i++ {
addr := uint8(i) addr := uint8(i)
slowVal := slow.get(addr) slowVal, slowOK := slow.get(addr)
fastVal := fast.get(addr) fastVal, fastOK := fast.get(addr)
if slowVal != fastVal { if !getsEqual(fastVal, fastOK, slowVal, slowOK) {
t.Fatalf("strideTable.get(%d) = %v, want %v", addr, *fastVal, *slowVal) t.Fatalf("strideTable.get(%d) = (%v, %v), want (%v, %v)", addr, fastVal, fastOK, slowVal, slowOK)
} }
} }
} }
@ -91,10 +91,14 @@ func TestStrideTableInsertShuffled(t *testing.T) {
zero := 0 zero := 0
rt := strideTable[int]{} rt := strideTable[int]{}
// strideTable has a value interface, but internally has to keep
// track of distinct routes even if they all have the same
// value. rtZero uses the same value for all routes, and expects
// correct behavior.
rtZero := strideTable[int]{} rtZero := strideTable[int]{}
for _, route := range routes { for _, route := range routes {
rt.insert(route.addr, route.len, route.val) rt.insert(route.addr, route.len, route.val)
rtZero.insert(route.addr, route.len, &zero) rtZero.insert(route.addr, route.len, zero)
} }
// Order of insertion should not affect the final shape of the stride table. // Order of insertion should not affect the final shape of the stride table.
@ -105,15 +109,15 @@ func TestStrideTableInsertShuffled(t *testing.T) {
for _, route := range routes2 { for _, route := range routes2 {
rt2.insert(route.addr, route.len, route.val) rt2.insert(route.addr, route.len, route.val)
} }
if diff := cmp.Diff(rt, rt2, cmpDiffOpts...); diff != "" { if diff := cmp.Diff(rt.tableDebugString(), rt2.tableDebugString()); diff != "" {
t.Errorf("tables ended up different with different insertion order (-got+want):\n%s\n\nOrder 1: %v\nOrder 2: %v", diff, formatSlowEntriesShort(routes), formatSlowEntriesShort(routes2)) t.Errorf("tables ended up different with different insertion order (-got+want):\n%s\n\nOrder 1: %v\nOrder 2: %v", diff, formatSlowEntriesShort(routes), formatSlowEntriesShort(routes2))
} }
rtZero2 := strideTable[int]{} rtZero2 := strideTable[int]{}
for _, route := range routes2 { for _, route := range routes2 {
rtZero2.insert(route.addr, route.len, &zero) rtZero2.insert(route.addr, route.len, zero)
} }
if diff := cmp.Diff(rtZero, rtZero2, cmpDiffOpts...); diff != "" { if diff := cmp.Diff(rtZero.tableDebugString(), rtZero2.tableDebugString(), cmpDiffOpts...); diff != "" {
t.Errorf("tables with identical vals ended up different with different insertion order (-got+want):\n%s\n\nOrder 1: %v\nOrder 2: %v", diff, formatSlowEntriesShort(routes), formatSlowEntriesShort(routes2)) t.Errorf("tables with identical vals ended up different with different insertion order (-got+want):\n%s\n\nOrder 1: %v\nOrder 2: %v", diff, formatSlowEntriesShort(routes), formatSlowEntriesShort(routes2))
} }
} }
@ -150,10 +154,10 @@ func TestStrideTableDelete(t *testing.T) {
for i := 0; i < 256; i++ { for i := 0; i < 256; i++ {
addr := uint8(i) addr := uint8(i)
slowVal := slow.get(addr) slowVal, slowOK := slow.get(addr)
fastVal := fast.get(addr) fastVal, fastOK := fast.get(addr)
if slowVal != fastVal { if !getsEqual(fastVal, fastOK, slowVal, slowOK) {
t.Fatalf("strideTable.get(%d) = %v, want %v", addr, *fastVal, *slowVal) t.Fatalf("strideTable.get(%d) = (%v, %v), want (%v, %v)", addr, fastVal, fastOK, slowVal, slowOK)
} }
} }
} }
@ -168,10 +172,14 @@ func TestStrideTableDeleteShuffle(t *testing.T) {
zero := 0 zero := 0
rt := strideTable[int]{} rt := strideTable[int]{}
// strideTable has a value interface, but internally has to keep
// track of distinct routes even if they all have the same
// value. rtZero uses the same value for all routes, and expects
// correct behavior.
rtZero := strideTable[int]{} rtZero := strideTable[int]{}
for _, route := range routes { for _, route := range routes {
rt.insert(route.addr, route.len, route.val) rt.insert(route.addr, route.len, route.val)
rtZero.insert(route.addr, route.len, &zero) rtZero.insert(route.addr, route.len, zero)
} }
for _, route := range toDelete { for _, route := range toDelete {
rt.delete(route.addr, route.len) rt.delete(route.addr, route.len)
@ -189,18 +197,18 @@ func TestStrideTableDeleteShuffle(t *testing.T) {
for _, route := range toDelete2 { for _, route := range toDelete2 {
rt2.delete(route.addr, route.len) rt2.delete(route.addr, route.len)
} }
if diff := cmp.Diff(rt, rt2, cmpDiffOpts...); diff != "" { if diff := cmp.Diff(rt.tableDebugString(), rt2.tableDebugString(), cmpDiffOpts...); diff != "" {
t.Errorf("tables ended up different with different deletion order (-got+want):\n%s\n\nOrder 1: %v\nOrder 2: %v", diff, formatSlowEntriesShort(toDelete), formatSlowEntriesShort(toDelete2)) t.Errorf("tables ended up different with different deletion order (-got+want):\n%s\n\nOrder 1: %v\nOrder 2: %v", diff, formatSlowEntriesShort(toDelete), formatSlowEntriesShort(toDelete2))
} }
rtZero2 := strideTable[int]{} rtZero2 := strideTable[int]{}
for _, route := range routes { for _, route := range routes {
rtZero2.insert(route.addr, route.len, &zero) rtZero2.insert(route.addr, route.len, zero)
} }
for _, route := range toDelete2 { for _, route := range toDelete2 {
rtZero2.delete(route.addr, route.len) rtZero2.delete(route.addr, route.len)
} }
if diff := cmp.Diff(rtZero, rtZero2, cmpDiffOpts...); diff != "" { if diff := cmp.Diff(rtZero.tableDebugString(), rtZero2.tableDebugString(), cmpDiffOpts...); diff != "" {
t.Errorf("tables with identical vals ended up different with different deletion order (-got+want):\n%s\n\nOrder 1: %v\nOrder 2: %v", diff, formatSlowEntriesShort(toDelete), formatSlowEntriesShort(toDelete2)) t.Errorf("tables with identical vals ended up different with different deletion order (-got+want):\n%s\n\nOrder 1: %v\nOrder 2: %v", diff, formatSlowEntriesShort(toDelete), formatSlowEntriesShort(toDelete2))
} }
} }
@ -218,31 +226,35 @@ func forStrideCountAndOrdering(b *testing.B, fn func(b *testing.B, routes []slow
routes := shufflePrefixes(allPrefixes()) routes := shufflePrefixes(allPrefixes())
for _, nroutes := range strideRouteCount { for _, nroutes := range strideRouteCount {
b.Run(fmt.Sprint(nroutes), func(b *testing.B) { b.Run(fmt.Sprint(nroutes), func(b *testing.B) {
routes := append([]slowEntry[int](nil), routes[:nroutes]...) runAndRecord := func(b *testing.B) {
b.Run("random_order", func(b *testing.B) {
b.ReportAllocs() b.ReportAllocs()
var startMem, endMem runtime.MemStats
runtime.ReadMemStats(&startMem)
fn(b, routes) fn(b, routes)
}) runtime.ReadMemStats(&endMem)
ops := float64(b.N) * float64(len(routes))
allocs := float64(endMem.Mallocs - startMem.Mallocs)
bytes := float64(endMem.TotalAlloc - startMem.TotalAlloc)
b.ReportMetric(roundFloat64(allocs/ops), "allocs/op")
b.ReportMetric(roundFloat64(bytes/ops), "B/op")
}
routes := append([]slowEntry[int](nil), routes[:nroutes]...)
b.Run("random_order", runAndRecord)
sort.Slice(routes, func(i, j int) bool { sort.Slice(routes, func(i, j int) bool {
if routes[i].len < routes[j].len { if routes[i].len < routes[j].len {
return true return true
} }
return routes[i].addr < routes[j].addr return routes[i].addr < routes[j].addr
}) })
b.Run("largest_first", func(b *testing.B) { b.Run("largest_first", runAndRecord)
b.ReportAllocs()
fn(b, routes)
})
sort.Slice(routes, func(i, j int) bool { sort.Slice(routes, func(i, j int) bool {
if routes[j].len < routes[i].len { if routes[j].len < routes[i].len {
return true return true
} }
return routes[j].addr < routes[i].addr return routes[j].addr < routes[i].addr
}) })
b.Run("smallest_first", func(b *testing.B) { b.Run("smallest_first", runAndRecord)
b.ReportAllocs()
fn(b, routes)
})
}) })
} }
} }
@ -253,7 +265,7 @@ func BenchmarkStrideTableInsertion(b *testing.B) {
for i := 0; i < b.N; i++ { for i := 0; i < b.N; i++ {
var rt strideTable[int] var rt strideTable[int]
for _, route := range routes { for _, route := range routes {
rt.insert(route.addr, route.len, &val) rt.insert(route.addr, route.len, val)
} }
} }
inserts := float64(b.N) * float64(len(routes)) inserts := float64(b.N) * float64(len(routes))
@ -269,7 +281,7 @@ func BenchmarkStrideTableDeletion(b *testing.B) {
val := 0 val := 0
var rt strideTable[int] var rt strideTable[int]
for _, route := range routes { for _, route := range routes {
rt.insert(route.addr, route.len, &val) rt.insert(route.addr, route.len, val)
} }
b.ResetTimer() b.ResetTimer()
@ -287,7 +299,7 @@ func BenchmarkStrideTableDeletion(b *testing.B) {
}) })
} }
var writeSink *int var writeSink int
func BenchmarkStrideTableGet(b *testing.B) { func BenchmarkStrideTableGet(b *testing.B) {
// No need to forCountAndOrdering here, route lookup time is independent of // No need to forCountAndOrdering here, route lookup time is independent of
@ -300,7 +312,7 @@ func BenchmarkStrideTableGet(b *testing.B) {
b.ResetTimer() b.ResetTimer()
for i := 0; i < b.N; i++ { for i := 0; i < b.N; i++ {
writeSink = rt.get(uint8(i)) writeSink, _ = rt.get(uint8(i))
} }
gets := float64(b.N) gets := float64(b.N)
elapsedSec := b.Elapsed().Seconds() elapsedSec := b.Elapsed().Seconds()
@ -318,7 +330,7 @@ type slowTable[T any] struct {
type slowEntry[T any] struct { type slowEntry[T any] struct {
addr uint8 addr uint8
len int len int
val *T val T
} }
func (t *slowTable[T]) String() string { func (t *slowTable[T]) String() string {
@ -331,13 +343,14 @@ func (t *slowTable[T]) String() string {
}) })
var ret bytes.Buffer var ret bytes.Buffer
for _, pfx := range pfxs { for _, pfx := range pfxs {
fmt.Fprintf(&ret, "%3d/%d (%08b/%08b) = %v\n", pfx.addr, pfx.len, pfx.addr, pfxMask(pfx.len), *pfx.val) fmt.Fprintf(&ret, "%3d/%d (%08b/%08b) = %v\n", pfx.addr, pfx.len, pfx.addr, pfxMask(pfx.len), pfx.val)
} }
return ret.String() return ret.String()
} }
func (t *slowTable[T]) insert(addr uint8, prefixLen int, val *T) { func (t *slowTable[T]) insert(addr uint8, prefixLen int, val T) {
t.delete(addr, prefixLen) // no-op if prefix doesn't exist t.delete(addr, prefixLen) // no-op if prefix doesn't exist
t.prefixes = append(t.prefixes, slowEntry[T]{addr, prefixLen, val}) t.prefixes = append(t.prefixes, slowEntry[T]{addr, prefixLen, val})
} }
@ -352,18 +365,15 @@ func (t *slowTable[T]) delete(addr uint8, prefixLen int) {
t.prefixes = pfx t.prefixes = pfx
} }
func (t *slowTable[T]) get(addr uint8) *T { func (t *slowTable[T]) get(addr uint8) (ret T, ok bool) {
var ( var curLen = -1
ret *T
curLen = -1
)
for _, e := range t.prefixes { for _, e := range t.prefixes {
if addr&pfxMask(e.len) == e.addr && e.len >= curLen { if addr&pfxMask(e.len) == e.addr && e.len >= curLen {
ret = e.val ret = e.val
curLen = e.len curLen = e.len
} }
} }
return ret return ret, curLen != -1
} }
func pfxMask(pfxLen int) uint8 { func pfxMask(pfxLen int) uint8 {
@ -374,7 +384,7 @@ func allPrefixes() []slowEntry[int] {
ret := make([]slowEntry[int], 0, lastHostIndex) ret := make([]slowEntry[int], 0, lastHostIndex)
for i := 1; i < lastHostIndex+1; i++ { for i := 1; i < lastHostIndex+1; i++ {
a, l := inversePrefixIndex(i) a, l := inversePrefixIndex(i)
ret = append(ret, slowEntry[int]{a, l, ptr.To(i)}) ret = append(ret, slowEntry[int]{a, l, i})
} }
return ret return ret
} }
@ -393,6 +403,15 @@ func formatSlowEntriesShort[T any](ents []slowEntry[T]) string {
} }
var cmpDiffOpts = []cmp.Option{ var cmpDiffOpts = []cmp.Option{
cmp.AllowUnexported(strideTable[int]{}, strideEntry[int]{}),
cmp.Comparer(func(a, b netip.Prefix) bool { return a == b }), cmp.Comparer(func(a, b netip.Prefix) bool { return a == b }),
} }
func getsEqual[T comparable](a T, aOK bool, b T, bOK bool) bool {
if !aOK && !bOK {
return true
}
if aOK != bOK {
return false
}
return a == b
}

19
net/art/table.go
Unescape Escape View File

@ -51,7 +51,7 @@ func (t *Table[T]) tableForAddr(addr netip.Addr) *strideTable[T] {
// Get does a route lookup for addr and returns the associated value, or nil if // Get does a route lookup for addr and returns the associated value, or nil if
// no route matched. // no route matched.
func (t *Table[T]) Get(addr netip.Addr) *T { func (t *Table[T]) Get(addr netip.Addr) (ret T, ok bool) {
t.init() t.init()
// Ideally we would use addr.AsSlice here, but AsSlice is just // Ideally we would use addr.AsSlice here, but AsSlice is just
@ -84,13 +84,13 @@ func (t *Table[T]) Get(addr netip.Addr) *T {
const maxDepth = 16 const maxDepth = 16
type prefixAndRoute struct { type prefixAndRoute struct {
prefix netip.Prefix prefix netip.Prefix
route *T route T
} }
strideMatch := make([]prefixAndRoute, 0, maxDepth) strideMatch := make([]prefixAndRoute, 0, maxDepth)
findLeaf: findLeaf:
for { for {
rt, child := st.getValAndChild(bs[i]) rt, rtOK, child := st.getValAndChild(bs[i])
if rt != nil { if rtOK {
// This strideTable contains a route that may be relevant to our // This strideTable contains a route that may be relevant to our
// search, remember it. // search, remember it.
strideMatch = append(strideMatch, prefixAndRoute{st.prefix, rt}) strideMatch = append(strideMatch, prefixAndRoute{st.prefix, rt})
@ -115,7 +115,7 @@ findLeaf:
// the correct most-specific route. // the correct most-specific route.
for i := len(strideMatch) - 1; i >= 0; i-- { for i := len(strideMatch) - 1; i >= 0; i-- {
if m := strideMatch[i]; m.prefix.Contains(addr) { if m := strideMatch[i]; m.prefix.Contains(addr) {
return m.route return m.route, true
} }
} }
@ -123,16 +123,13 @@ findLeaf:
// immediately), or we went on a wild goose chase down a compressed path for // immediately), or we went on a wild goose chase down a compressed path for
// the wrong prefix, and also found no usable routes on the way back up to // the wrong prefix, and also found no usable routes on the way back up to
// the root. This is a miss. // the root. This is a miss.
return nil return ret, false
} }
// Insert adds pfx to the table, with value val. // Insert adds pfx to the table, with value val.
// If pfx is already present in the table, its value is set to val. // If pfx is already present in the table, its value is set to val.
func (t *Table[T]) Insert(pfx netip.Prefix, val *T) { func (t *Table[T]) Insert(pfx netip.Prefix, val T) {
t.init() t.init()
if val == nil {
panic("Table.Insert called with nil value")
}
// The standard library doesn't enforce normalized prefixes (where // The standard library doesn't enforce normalized prefixes (where
// the non-prefix bits are all zero). These algorithms require // the non-prefix bits are all zero). These algorithms require
@ -423,7 +420,7 @@ func (t *Table[T]) Delete(pfx netip.Prefix) {
if debugDelete { if debugDelete {
fmt.Printf("delete: delete from st.prefix=%s addr=%d/%d\n", st.prefix, bs[byteIdx], numBits) fmt.Printf("delete: delete from st.prefix=%s addr=%d/%d\n", st.prefix, bs[byteIdx], numBits)
} }
if st.delete(bs[byteIdx], numBits) == nil { if routeExisted := st.delete(bs[byteIdx], numBits); !routeExisted {
// We're in the right strideTable, but pfx wasn't in // We're in the right strideTable, but pfx wasn't in
// it. Refcounts haven't changed, so we can skip cleanup. // it. Refcounts haven't changed, so we can skip cleanup.
if debugDelete { if debugDelete {

190
net/art/table_test.go
Unescape Escape View File

@ -12,8 +12,6 @@ import (
"strconv" "strconv"
"testing" "testing"
"time" "time"
"tailscale.com/types/ptr"
) )
func TestRegression(t *testing.T) { func TestRegression(t *testing.T) {
@ -30,17 +28,16 @@ func TestRegression(t *testing.T) {
slow := slowPrefixTable[int]{} slow := slowPrefixTable[int]{}
p := netip.MustParsePrefix p := netip.MustParsePrefix
v := ptr.To(1) tbl.Insert(p("226.205.197.0/24"), 1)
tbl.Insert(p("226.205.197.0/24"), v) slow.insert(p("226.205.197.0/24"), 1)
slow.insert(p("226.205.197.0/24"), v) tbl.Insert(p("226.205.0.0/16"), 2)
v = ptr.To(2) slow.insert(p("226.205.0.0/16"), 2)
tbl.Insert(p("226.205.0.0/16"), v)
slow.insert(p("226.205.0.0/16"), v)
probe := netip.MustParseAddr("226.205.121.152") probe := netip.MustParseAddr("226.205.121.152")
got, want := tbl.Get(probe), slow.get(probe) got, gotOK := tbl.Get(probe)
if got != want { want, wantOK := slow.get(probe)
t.Fatalf("got %v, want %v", got, want) if !getsEqual(got, gotOK, want, wantOK) {
t.Fatalf("got (%v, %v), want (%v, %v)", got, gotOK, want, wantOK)
} }
}) })
@ -49,18 +46,18 @@ func TestRegression(t *testing.T) {
// within computePrefixSplit. // within computePrefixSplit.
t1, t2 := &Table[int]{}, &Table[int]{} t1, t2 := &Table[int]{}, &Table[int]{}
p := netip.MustParsePrefix p := netip.MustParsePrefix
v1, v2 := ptr.To(1), ptr.To(2)
t1.Insert(p("136.20.0.0/16"), v1) t1.Insert(p("136.20.0.0/16"), 1)
t1.Insert(p("136.20.201.62/32"), v2) t1.Insert(p("136.20.201.62/32"), 2)
t2.Insert(p("136.20.201.62/32"), v2) t2.Insert(p("136.20.201.62/32"), 2)
t2.Insert(p("136.20.0.0/16"), v1) t2.Insert(p("136.20.0.0/16"), 1)
a := netip.MustParseAddr("136.20.54.139") a := netip.MustParseAddr("136.20.54.139")
got, want := t2.Get(a), t1.Get(a) got1, ok1 := t1.Get(a)
if got != want { got2, ok2 := t2.Get(a)
t.Errorf("Get(%q) is insertion order dependent (t1=%v, t2=%v)", a, want, got) if !getsEqual(got1, ok1, got2, ok2) {
t.Errorf("Get(%q) is insertion order dependent: t1=(%v, %v), t2=(%v, %v)", a, got1, ok1, got2, ok2)
} }
}) })
} }
@ -99,7 +96,7 @@ func TestInsert(t *testing.T) {
p := netip.MustParsePrefix p := netip.MustParsePrefix
// Create a new leaf strideTable, with compressed path // Create a new leaf strideTable, with compressed path
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", -1}, {"192.168.0.2", -1},
@ -114,7 +111,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert into previous leaf, no tree changes // Insert into previous leaf, no tree changes
tbl.Insert(p("192.168.0.2/32"), ptr.To(2)) tbl.Insert(p("192.168.0.2/32"), 2)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -129,7 +126,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert into previous leaf, unaligned prefix covering the /32s // Insert into previous leaf, unaligned prefix covering the /32s
tbl.Insert(p("192.168.0.0/26"), ptr.To(7)) tbl.Insert(p("192.168.0.0/26"), 7)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -144,7 +141,7 @@ func TestInsert(t *testing.T) {
}) })
// Create a different leaf elsewhere // Create a different leaf elsewhere
tbl.Insert(p("10.0.0.0/27"), ptr.To(3)) tbl.Insert(p("10.0.0.0/27"), 3)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -159,7 +156,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert that creates a new intermediate table and a new child // Insert that creates a new intermediate table and a new child
tbl.Insert(p("192.168.1.1/32"), ptr.To(4)) tbl.Insert(p("192.168.1.1/32"), 4)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -174,7 +171,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert that creates a new intermediate table but no new child // Insert that creates a new intermediate table but no new child
tbl.Insert(p("192.170.0.0/16"), ptr.To(5)) tbl.Insert(p("192.170.0.0/16"), 5)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -190,7 +187,7 @@ func TestInsert(t *testing.T) {
// New leaf in a different subtree, so the next insert can test a // New leaf in a different subtree, so the next insert can test a
// variant of decompression. // variant of decompression.
tbl.Insert(p("192.180.0.1/32"), ptr.To(8)) tbl.Insert(p("192.180.0.1/32"), 8)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -206,7 +203,7 @@ func TestInsert(t *testing.T) {
// Insert that creates a new intermediate table but no new child, // Insert that creates a new intermediate table but no new child,
// with an unaligned intermediate // with an unaligned intermediate
tbl.Insert(p("192.180.0.0/21"), ptr.To(9)) tbl.Insert(p("192.180.0.0/21"), 9)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -221,7 +218,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert a default route, those have their own codepath. // Insert a default route, those have their own codepath.
tbl.Insert(p("0.0.0.0/0"), ptr.To(6)) tbl.Insert(p("0.0.0.0/0"), 6)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -238,7 +235,7 @@ func TestInsert(t *testing.T) {
// Now all of the above again, but for IPv6. // Now all of the above again, but for IPv6.
// Create a new leaf strideTable, with compressed path // Create a new leaf strideTable, with compressed path
tbl.Insert(p("ff:aaaa::1/128"), ptr.To(1)) tbl.Insert(p("ff:aaaa::1/128"), 1)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", -1}, {"ff:aaaa::2", -1},
@ -253,7 +250,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert into previous leaf, no tree changes // Insert into previous leaf, no tree changes
tbl.Insert(p("ff:aaaa::2/128"), ptr.To(2)) tbl.Insert(p("ff:aaaa::2/128"), 2)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", 2}, {"ff:aaaa::2", 2},
@ -268,7 +265,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert into previous leaf, unaligned prefix covering the /128s // Insert into previous leaf, unaligned prefix covering the /128s
tbl.Insert(p("ff:aaaa::/125"), ptr.To(7)) tbl.Insert(p("ff:aaaa::/125"), 7)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", 2}, {"ff:aaaa::2", 2},
@ -283,7 +280,7 @@ func TestInsert(t *testing.T) {
}) })
// Create a different leaf elsewhere // Create a different leaf elsewhere
tbl.Insert(p("ffff:bbbb::/120"), ptr.To(3)) tbl.Insert(p("ffff:bbbb::/120"), 3)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", 2}, {"ff:aaaa::2", 2},
@ -298,7 +295,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert that creates a new intermediate table and a new child // Insert that creates a new intermediate table and a new child
tbl.Insert(p("ff:aaaa:aaaa::1/128"), ptr.To(4)) tbl.Insert(p("ff:aaaa:aaaa::1/128"), 4)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", 2}, {"ff:aaaa::2", 2},
@ -313,7 +310,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert that creates a new intermediate table but no new child // Insert that creates a new intermediate table but no new child
tbl.Insert(p("ff:aaaa:aaaa:bb00::/56"), ptr.To(5)) tbl.Insert(p("ff:aaaa:aaaa:bb00::/56"), 5)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", 2}, {"ff:aaaa::2", 2},
@ -329,7 +326,7 @@ func TestInsert(t *testing.T) {
// New leaf in a different subtree, so the next insert can test a // New leaf in a different subtree, so the next insert can test a
// variant of decompression. // variant of decompression.
tbl.Insert(p("ff:cccc::1/128"), ptr.To(8)) tbl.Insert(p("ff:cccc::1/128"), 8)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", 2}, {"ff:aaaa::2", 2},
@ -345,7 +342,7 @@ func TestInsert(t *testing.T) {
// Insert that creates a new intermediate table but no new child, // Insert that creates a new intermediate table but no new child,
// with an unaligned intermediate // with an unaligned intermediate
tbl.Insert(p("ff:cccc::/37"), ptr.To(9)) tbl.Insert(p("ff:cccc::/37"), 9)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", 2}, {"ff:aaaa::2", 2},
@ -360,7 +357,7 @@ func TestInsert(t *testing.T) {
}) })
// Insert a default route, those have their own codepath. // Insert a default route, those have their own codepath.
tbl.Insert(p("::/0"), ptr.To(6)) tbl.Insert(p("::/0"), 6)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"ff:aaaa::1", 1}, {"ff:aaaa::1", 1},
{"ff:aaaa::2", 2}, {"ff:aaaa::2", 2},
@ -384,7 +381,7 @@ func TestDelete(t *testing.T) {
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("10.0.0.0/8"), ptr.To(1)) tbl.Insert(p("10.0.0.0/8"), 1)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"10.0.0.1", 1}, {"10.0.0.1", 1},
{"255.255.255.255", -1}, {"255.255.255.255", -1},
@ -403,7 +400,7 @@ func TestDelete(t *testing.T) {
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"255.255.255.255", -1}, {"255.255.255.255", -1},
@ -421,8 +418,8 @@ func TestDelete(t *testing.T) {
// Create an intermediate with 2 children, then delete one leaf. // Create an intermediate with 2 children, then delete one leaf.
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
tbl.Insert(p("192.180.0.1/32"), ptr.To(2)) tbl.Insert(p("192.180.0.1/32"), 2)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.180.0.1", 2}, {"192.180.0.1", 2},
@ -442,9 +439,9 @@ func TestDelete(t *testing.T) {
// Same, but the intermediate carries a route as well. // Same, but the intermediate carries a route as well.
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
tbl.Insert(p("192.180.0.1/32"), ptr.To(2)) tbl.Insert(p("192.180.0.1/32"), 2)
tbl.Insert(p("192.0.0.0/10"), ptr.To(3)) tbl.Insert(p("192.0.0.0/10"), 3)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.180.0.1", 2}, {"192.180.0.1", 2},
@ -466,9 +463,9 @@ func TestDelete(t *testing.T) {
// Intermediate with 3 leaves, then delete one leaf. // Intermediate with 3 leaves, then delete one leaf.
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
tbl.Insert(p("192.180.0.1/32"), ptr.To(2)) tbl.Insert(p("192.180.0.1/32"), 2)
tbl.Insert(p("192.200.0.1/32"), ptr.To(3)) tbl.Insert(p("192.200.0.1/32"), 3)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.180.0.1", 2}, {"192.180.0.1", 2},
@ -490,7 +487,7 @@ func TestDelete(t *testing.T) {
// Delete non-existent prefix, missing strideTable path. // Delete non-existent prefix, missing strideTable path.
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.255.0.1", -1}, {"192.255.0.1", -1},
@ -509,7 +506,7 @@ func TestDelete(t *testing.T) {
// with a wrong turn. // with a wrong turn.
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.255.0.1", -1}, {"192.255.0.1", -1},
@ -528,7 +525,7 @@ func TestDelete(t *testing.T) {
// leaf doesn't contain route. // leaf doesn't contain route.
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.255.0.1", -1}, {"192.255.0.1", -1},
@ -547,8 +544,8 @@ func TestDelete(t *testing.T) {
// compactable. // compactable.
tbl := &Table[int]{} tbl := &Table[int]{}
checkSize(t, tbl, 2) checkSize(t, tbl, 2)
tbl.Insert(p("192.168.0.1/32"), ptr.To(1)) tbl.Insert(p("192.168.0.1/32"), 1)
tbl.Insert(p("192.168.0.0/22"), ptr.To(2)) tbl.Insert(p("192.168.0.0/22"), 2)
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
{"192.168.0.1", 1}, {"192.168.0.1", 1},
{"192.168.0.2", 2}, {"192.168.0.2", 2},
@ -568,7 +565,7 @@ func TestDelete(t *testing.T) {
// Default routes have a special case in the code. // Default routes have a special case in the code.
tbl := &Table[int]{} tbl := &Table[int]{}
tbl.Insert(p("0.0.0.0/0"), ptr.To(1)) tbl.Insert(p("0.0.0.0/0"), 1)
tbl.Delete(p("0.0.0.0/0")) tbl.Delete(p("0.0.0.0/0"))
checkRoutes(t, tbl, []tableTest{ checkRoutes(t, tbl, []tableTest{
@ -595,20 +592,20 @@ func TestInsertCompare(t *testing.T) {
t.Logf(fast.debugSummary()) t.Logf(fast.debugSummary())
} }
seenVals4 := map[*int]bool{} seenVals4 := map[int]bool{}
seenVals6 := map[*int]bool{} seenVals6 := map[int]bool{}
for i := 0; i < 10_000; i++ { for i := 0; i < 10_000; i++ {
a := randomAddr() a := randomAddr()
slowVal := slow.get(a) slowVal, slowOK := slow.get(a)
fastVal := fast.Get(a) fastVal, fastOK := fast.Get(a)
if !getsEqual(slowVal, slowOK, fastVal, fastOK) {
t.Fatalf("get(%q) = (%v, %v), want (%v, %v)", a, fastVal, fastOK, slowVal, slowOK)
}
if a.Is6() { if a.Is6() {
seenVals6[fastVal] = true seenVals6[fastVal] = true
} else { } else {
seenVals4[fastVal] = true seenVals4[fastVal] = true
} }
if slowVal != fastVal {
t.Fatalf("get(%q) = %p, want %p", a, fastVal, slowVal)
}
} }
// Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in // Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in
@ -667,13 +664,10 @@ func TestInsertShuffled(t *testing.T) {
} }
for _, a := range addrs { for _, a := range addrs {
val1 := rt.Get(a) val1, ok1 := rt.Get(a)
val2 := rt2.Get(a) val2, ok2 := rt2.Get(a)
if val1 == nil && val2 == nil { if !getsEqual(val1, ok1, val2, ok2) {
continue t.Fatalf("get(%q) = (%v, %v), want (%v, %v)", a, val2, ok2, val1, ok1)
}
if (val1 == nil && val2 != nil) || (val1 != nil && val2 == nil) || (*val1 != *val2) {
t.Fatalf("get(%q) = %s, want %s", a, printIntPtr(val2), printIntPtr(val1))
} }
} }
} }
@ -727,20 +721,20 @@ func TestDeleteCompare(t *testing.T) {
fast.Delete(pfx.pfx) fast.Delete(pfx.pfx)
} }
seenVals4 := map[*int]bool{} seenVals4 := map[int]bool{}
seenVals6 := map[*int]bool{} seenVals6 := map[int]bool{}
for i := 0; i < numProbes; i++ { for i := 0; i < numProbes; i++ {
a := randomAddr() a := randomAddr()
slowVal := slow.get(a) slowVal, slowOK := slow.get(a)
fastVal := fast.Get(a) fastVal, fastOK := fast.Get(a)
if !getsEqual(slowVal, slowOK, fastVal, fastOK) {
t.Fatalf("get(%q) = (%v, %v), want (%v, %v)", a, fastVal, fastOK, slowVal, slowOK)
}
if a.Is6() { if a.Is6() {
seenVals6[fastVal] = true seenVals6[fastVal] = true
} else { } else {
seenVals4[fastVal] = true seenVals4[fastVal] = true
} }
if slowVal != fastVal {
t.Fatalf("get(%q) = %p, want %p", a, fastVal, slowVal)
}
} }
// Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in // Empirically, 10k probes into 5k v4 prefixes and 5k v6 prefixes results in
// ~1k distinct values for v4 and ~300 for v6. distinct routes. This sanity // ~1k distinct values for v4 and ~300 for v6. distinct routes. This sanity
@ -814,13 +808,10 @@ func TestDeleteShuffled(t *testing.T) {
// test for equivalence statistically with random probes instead. // test for equivalence statistically with random probes instead.
for i := 0; i < numProbes; i++ { for i := 0; i < numProbes; i++ {
a := randomAddr() a := randomAddr()
val1 := rt.Get(a) val1, ok1 := rt.Get(a)
val2 := rt2.Get(a) val2, ok2 := rt2.Get(a)
if val1 == nil && val2 == nil { if !getsEqual(val1, ok1, val2, ok2) {
continue t.Errorf("get(%q) = (%v, %v), want (%v, %v)", a, val2, ok2, val1, ok1)
}
if (val1 == nil && val2 != nil) || (val1 != nil && val2 == nil) || (*val1 != *val2) {
t.Errorf("get(%q) = %s, want %s", a, printIntPtr(val2), printIntPtr(val1))
} }
} }
} }
@ -868,12 +859,12 @@ type tableTest struct {
func checkRoutes(t *testing.T, tbl *Table[int], tt []tableTest) { func checkRoutes(t *testing.T, tbl *Table[int], tt []tableTest) {
t.Helper() t.Helper()
for _, tc := range tt { for _, tc := range tt {
v := tbl.Get(netip.MustParseAddr(tc.addr)) v, ok := tbl.Get(netip.MustParseAddr(tc.addr))
if v == nil && tc.want != -1 { if !ok && tc.want != -1 {
t.Errorf("lookup %q got nil, want %d", tc.addr, tc.want) t.Errorf("lookup %q got (%v, %v), want (_, false)", tc.addr, v, ok)
} }
if v != nil && *v != tc.want { if ok && v != tc.want {
t.Errorf("lookup %q got %d, want %d", tc.addr, *v, tc.want) t.Errorf("lookup %q got (%v, %v), want (%v, true)", tc.addr, v, ok, tc.want)
} }
} }
} }
@ -1005,7 +996,7 @@ func BenchmarkTableGet(b *testing.B) {
for i := 0; i < b.N; i++ { for i := 0; i < b.N; i++ {
addr := genAddr() addr := genAddr()
t.Start() t.Start()
writeSink = rt.Get(addr) writeSink, _ = rt.Get(addr)
t.Stop() t.Stop()
} }
}) })
@ -1112,7 +1103,7 @@ type slowPrefixTable[T any] struct {
type slowPrefixEntry[T any] struct { type slowPrefixEntry[T any] struct {
pfx netip.Prefix pfx netip.Prefix
val *T val T
} }
func (t *slowPrefixTable[T]) delete(pfx netip.Prefix) { func (t *slowPrefixTable[T]) delete(pfx netip.Prefix) {
@ -1127,7 +1118,7 @@ func (t *slowPrefixTable[T]) delete(pfx netip.Prefix) {
t.prefixes = ret t.prefixes = ret
} }
func (t *slowPrefixTable[T]) insert(pfx netip.Prefix, val *T) { func (t *slowPrefixTable[T]) insert(pfx netip.Prefix, val T) {
pfx = pfx.Masked() pfx = pfx.Masked()
for i, ent := range t.prefixes { for i, ent := range t.prefixes {
if ent.pfx == pfx { if ent.pfx == pfx {
@ -1138,11 +1129,8 @@ func (t *slowPrefixTable[T]) insert(pfx netip.Prefix, val *T) {
t.prefixes = append(t.prefixes, slowPrefixEntry[T]{pfx, val}) t.prefixes = append(t.prefixes, slowPrefixEntry[T]{pfx, val})
} }
func (t *slowPrefixTable[T]) get(addr netip.Addr) *T { func (t *slowPrefixTable[T]) get(addr netip.Addr) (ret T, ok bool) {
var ( bestLen := -1
ret *T
bestLen = -1
)
for _, pfx := range t.prefixes { for _, pfx := range t.prefixes {
if pfx.pfx.Contains(addr) && pfx.pfx.Bits() > bestLen { if pfx.pfx.Contains(addr) && pfx.pfx.Bits() > bestLen {
@ -1150,7 +1138,7 @@ func (t *slowPrefixTable[T]) get(addr netip.Addr) *T {
bestLen = pfx.pfx.Bits() bestLen = pfx.pfx.Bits()
} }
} }
return ret return ret, bestLen != -1
} }
// randomPrefixes returns n randomly generated prefixes and associated values, // randomPrefixes returns n randomly generated prefixes and associated values,
@ -1176,7 +1164,7 @@ func randomPrefixes4(n int) []slowPrefixEntry[int] {
ret := make([]slowPrefixEntry[int], 0, len(pfxs)) ret := make([]slowPrefixEntry[int], 0, len(pfxs))
for pfx := range pfxs { for pfx := range pfxs {
ret = append(ret, slowPrefixEntry[int]{pfx, ptr.To(rand.Int())}) ret = append(ret, slowPrefixEntry[int]{pfx, rand.Int()})
} }
return ret return ret
@ -1197,7 +1185,7 @@ func randomPrefixes6(n int) []slowPrefixEntry[int] {
ret := make([]slowPrefixEntry[int], 0, len(pfxs)) ret := make([]slowPrefixEntry[int], 0, len(pfxs))
for pfx := range pfxs { for pfx := range pfxs {
ret = append(ret, slowPrefixEntry[int]{pfx, ptr.To(rand.Int())}) ret = append(ret, slowPrefixEntry[int]{pfx, rand.Int()})
} }
return ret return ret
@ -1230,14 +1218,6 @@ func randomAddr6() netip.Addr {
return netip.AddrFrom16(b) return netip.AddrFrom16(b)
} }
// printIntPtr returns *v as a string, or the literal "<nil>" if v is nil.
func printIntPtr(v *int) string {
if v == nil {
return "<nil>"
}
return fmt.Sprint(*v)
}
// roundFloat64 rounds f to 2 decimal places, for display. // roundFloat64 rounds f to 2 decimal places, for display.
// //
// It round-trips through a float->string->float conversion, so should not be // It round-trips through a float->string->float conversion, so should not be

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