Moved to atomicbitops and renamed files

7 files changed, 9 insertions, 147 deletions

diff --git a/pkg/tcpip/BUILD b/pkg/tcpip/BUILD
index 5237eba76..ea46c30da 100644
--- a/pkg/tcpip/BUILD
+++ b/pkg/tcpip/BUILD
@@ -19,8 +19,6 @@ go_template_instance(
 go_library(
     name = "tcpip",
     srcs = [
-        "aligned.go",
-        "aligned_unsafe.go",
         "errors.go",
         "sock_err_list.go",
         "socketops.go",
@@ -31,6 +29,7 @@ go_library(
     ],
     visibility = ["//visibility:public"],
     deps = [
+        "//pkg/atomicbitops",
         "//pkg/sync",
         "//pkg/tcpip/buffer",
         "//pkg/waiter",
diff --git a/pkg/tcpip/aligned.go b/pkg/tcpip/aligned.go
deleted file mode 100644
index ea22c101f..000000000
--- a/pkg/tcpip/aligned.go
+++ /dev/null
@@ -1,61 +0,0 @@
-// Copyright 2021 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build !arm,!386
-
-package tcpip
-
-import "sync/atomic"
-
-// AlignedAtomicInt64 is an atomic int64 that is guaranteed to be 64-bit
-// aligned, even on 32-bit systems. On 64-bit machines, it's just a regular
-// int64.
-//
-// See aligned_unsafe.go in this directory for justification.
-type AlignedAtomicInt64 struct {
-	value int64
-}
-
-func (aa *AlignedAtomicInt64) Load() int64 {
-	return atomic.LoadInt64(&aa.value)
-}
-
-func (aa *AlignedAtomicInt64) Store(v int64) {
-	atomic.StoreInt64(&aa.value, v)
-}
-
-func (aa *AlignedAtomicInt64) Add(v int64) int64 {
-	return atomic.AddInt64(&aa.value, v)
-}
-
-// AlignedAtomicUint64 is an atomic uint64 that is guaranteed to be 64-bit
-// aligned, even on 32-bit systems. On 64-bit machines, it's just a regular
-// uint64.
-//
-// See aligned_unsafe.go in this directory for justification.
-type AlignedAtomicUint64 struct {
-	value uint64
-}
-
-func (aa *AlignedAtomicUint64) Load() uint64 {
-	return atomic.LoadUint64(&aa.value)
-}
-
-func (aa *AlignedAtomicUint64) Store(v uint64) {
-	atomic.StoreUint64(&aa.value, v)
-}
-
-func (aa *AlignedAtomicUint64) Add(v uint64) uint64 {
-	return atomic.AddUint64(&aa.value, v)
-}
diff --git a/pkg/tcpip/aligned_unsafe.go b/pkg/tcpip/aligned_unsafe.go
deleted file mode 100644
index 35e869453..000000000
--- a/pkg/tcpip/aligned_unsafe.go
+++ /dev/null
@@ -1,80 +0,0 @@
-// Copyright 2021 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build arm 386
-
-package tcpip
-
-import (
-	"sync/atomic"
-	"unsafe"
-)
-
-// AlignedAtomicInt64 is an atomic int64 that is guaranteed to be 64-bit
-// aligned, even on 32-bit systems.
-//
-// Per https://golang.org/pkg/sync/atomic/#pkg-note-BUG:
-//
-// "On ARM, 386, and 32-bit MIPS, it is the caller's responsibility to arrange
-// for 64-bit alignment of 64-bit words accessed atomically. The first word in
-// a variable or in an allocated struct, array, or slice can be relied upon to
-// be 64-bit aligned."
-type AlignedAtomicInt64 struct {
-	value [15]byte
-}
-
-func (aa *AlignedAtomicInt64) ptr() *int64 {
-	return (*int64)(unsafe.Pointer((uintptr(unsafe.Pointer(&aa.value)) + 7) &^ 7))
-}
-
-func (aa *AlignedAtomicInt64) Load() int64 {
-	return atomic.LoadInt64(aa.ptr())
-}
-
-func (aa *AlignedAtomicInt64) Store(v int64) {
-	atomic.StoreInt64(aa.ptr(), v)
-}
-
-func (aa *AlignedAtomicInt64) Add(v int64) int64 {
-	return atomic.AddInt64(aa.ptr(), v)
-}
-
-// AlignedAtomicUint64 is an atomic uint64 that is guaranteed to be 64-bit
-// aligned, even on 32-bit systems.
-//
-// Per https://golang.org/pkg/sync/atomic/#pkg-note-BUG:
-//
-// "On ARM, 386, and 32-bit MIPS, it is the caller's responsibility to arrange
-// for 64-bit alignment of 64-bit words accessed atomically. The first word in
-// a variable or in an allocated struct, array, or slice can be relied upon to
-// be 64-bit aligned."
-type AlignedAtomicUint64 struct {
-	value [15]byte
-}
-
-func (aa *AlignedAtomicUint64) ptr() *uint64 {
-	return (*uint64)(unsafe.Pointer((uintptr(unsafe.Pointer(&aa.value)) + 7) &^ 7))
-}
-
-func (aa *AlignedAtomicUint64) Load() uint64 {
-	return atomic.LoadUint64(aa.ptr())
-}
-
-func (aa *AlignedAtomicUint64) Store(v uint64) {
-	atomic.StoreUint64(aa.ptr(), v)
-}
-
-func (aa *AlignedAtomicUint64) Add(v uint64) uint64 {
-	return atomic.AddUint64(aa.ptr(), v)
-}
diff --git a/pkg/tcpip/socketops.go b/pkg/tcpip/socketops.go
index 8158e238d..b26936b7f 100644
--- a/pkg/tcpip/socketops.go
+++ b/pkg/tcpip/socketops.go
@@ -18,6 +18,7 @@ import (
 	"math"
 	"sync/atomic"
 
+	"gvisor.dev/gvisor/pkg/atomicbitops"
 	"gvisor.dev/gvisor/pkg/sync"
 )
 
@@ -213,7 +214,7 @@ type SocketOptions struct {
 	getSendBufferLimits GetSendBufferLimits `state:"manual"`
 
 	// sendBufferSize determines the send buffer size for this socket.
-	sendBufferSize AlignedAtomicInt64
+	sendBufferSize atomicbitops.AlignedAtomicInt64
 
 	// getReceiveBufferLimits provides the handler to get the min, default and
 	// max size for receive buffer. It is initialized at the creation time and
diff --git a/pkg/tcpip/stack/BUILD b/pkg/tcpip/stack/BUILD
index 2bd6a67f5..63ab31083 100644
--- a/pkg/tcpip/stack/BUILD
+++ b/pkg/tcpip/stack/BUILD
@@ -73,6 +73,7 @@ go_library(
     ],
     visibility = ["//visibility:public"],
     deps = [
+        "//pkg/atomicbitops",
         "//pkg/ilist",
         "//pkg/log",
         "//pkg/rand",
diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go
index 436392f23..3d9e1e286 100644
--- a/pkg/tcpip/stack/stack.go
+++ b/pkg/tcpip/stack/stack.go
@@ -29,6 +29,7 @@ import (
 	"time"
 
 	"golang.org/x/time/rate"
+	"gvisor.dev/gvisor/pkg/atomicbitops"
 	"gvisor.dev/gvisor/pkg/rand"
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/tcpip"
@@ -65,10 +66,10 @@ type ResumableEndpoint interface {
 }
 
 // uniqueIDGenerator is a default unique ID generator.
-type uniqueIDGenerator uint64
+type uniqueIDGenerator atomicbitops.AlignedAtomicUint64
 
 func (u *uniqueIDGenerator) UniqueID() uint64 {
-	return atomic.AddUint64((*uint64)(u), 1)
+	return ((*atomicbitops.AlignedAtomicUint64)(u)).Add(1)
 }
 
 // Stack is a networking stack, with all supported protocols, NICs, and route
diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go
index 1bc13ef68..b39af42c4 100644
--- a/pkg/tcpip/tcpip.go
+++ b/pkg/tcpip/tcpip.go
@@ -40,6 +40,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"gvisor.dev/gvisor/pkg/atomicbitops"
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/waiter"
 )
@@ -1220,7 +1221,7 @@ type NetworkProtocolNumber uint32
 
 // A StatCounter keeps track of a statistic.
 type StatCounter struct {
-	count AlignedAtomicUint64
+	count atomicbitops.AlignedAtomicUint64
 }
 
 // Increment adds one to the counter.