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net/art: factor out picking the right strideTable for addr family

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Updates #7781

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2023-07-24 12:05:45 -07:00 committed by Dave Anderson
parent 125b982ba5
commit 44ad7b3746
1 changed files with 13 additions and 18 deletions
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31
net/art/table.go
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@ -41,6 +41,13 @@ func (t *Table[T]) init() {
})
}
func (t *Table[T]) tableForAddr(addr netip.Addr) *strideTable[T] {
if addr.Is6() {
return &t.v6
}
return &t.v4
}
// Get does a route lookup for addr and returns the associated value, or nil if
// no route matched.
func (t *Table[T]) Get(addr netip.Addr) *T {
@ -50,17 +57,11 @@ func (t *Table[T]) Get(addr netip.Addr) *T {
// barely complex enough that it can't be inlined, and that in
// turn causes the slice to escape to the heap. Using As16 and
// manual slicing here helps the compiler keep Get alloc-free.
st := t.tableForAddr(addr)
rawAddr := addr.As16()
var (
st *strideTable[T]
bs []byte
)
if addr.Is6() {
st = &t.v6
bs = rawAddr[:]
} else {
st = &t.v4
bs = rawAddr[12:]
bs := rawAddr[:]
if addr.Is4() {
bs = bs[12:]
}
i := 0
@ -144,10 +145,7 @@ func (t *Table[T]) Insert(pfx netip.Prefix, val *T) {
fmt.Printf("\ninsert: start pfx=%s\n", pfx)
}
st := &t.v4
if pfx.Addr().Is6() {
st = &t.v6
}
st := t.tableForAddr(pfx.Addr())
// This algorithm is full of off-by-one headaches that boil down
// to the fact that pfx.Bits() has (2^n)+1 values, rather than
@ -335,10 +333,7 @@ func (t *Table[T]) Delete(pfx netip.Prefix) {
fmt.Printf("\ndelete: start pfx=%s table:\n%s", pfx, t.debugSummary())
}
st := &t.v4
if pfx.Addr().Is6() {
st = &t.v6
}
st := t.tableForAddr(pfx.Addr())
// This algorithm is full of off-by-one headaches, just like
// Insert. See the comment in Insert for more details. Bottom