Enabling pkg/tcpip/link support on arm64.

Signed-off-by: Haibo Xu haibo.xu@arm.com
Change-Id: Ib6b4aa2db19032e58bf0395f714e6883caee460a

1 files changed, 0 insertions, 194 deletions

diff --git a/pkg/tcpip/link/fdbased/mmap_amd64.go b/pkg/tcpip/link/fdbased/mmap_amd64.go
deleted file mode 100644
index 029f86a18..000000000
--- a/pkg/tcpip/link/fdbased/mmap_amd64.go
+++ /dev/null
@@ -1,194 +0,0 @@
-// Copyright 2019 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 linux,amd64
-
-package fdbased
-
-import (
-	"encoding/binary"
-	"syscall"
-
-	"golang.org/x/sys/unix"
-	"gvisor.dev/gvisor/pkg/tcpip"
-	"gvisor.dev/gvisor/pkg/tcpip/buffer"
-	"gvisor.dev/gvisor/pkg/tcpip/header"
-	"gvisor.dev/gvisor/pkg/tcpip/link/rawfile"
-)
-
-const (
-	tPacketAlignment = uintptr(16)
-	tpStatusKernel   = 0
-	tpStatusUser     = 1
-	tpStatusCopy     = 2
-	tpStatusLosing   = 4
-)
-
-// We overallocate the frame size to accommodate space for the
-// TPacketHdr+RawSockAddrLinkLayer+MAC header and any padding.
-//
-// Memory allocated for the ring buffer: tpBlockSize * tpBlockNR = 2 MiB
-//
-// NOTE:
-//   Frames need to be aligned at 16 byte boundaries.
-//   BlockSize needs to be page aligned.
-//
-//   For details see PACKET_MMAP setting constraints in
-//   https://www.kernel.org/doc/Documentation/networking/packet_mmap.txt
-const (
-	tpFrameSize = 65536 + 128
-	tpBlockSize = tpFrameSize * 32
-	tpBlockNR   = 1
-	tpFrameNR   = (tpBlockSize * tpBlockNR) / tpFrameSize
-)
-
-// tPacketAlign aligns the pointer v at a tPacketAlignment boundary. Direct
-// translation of the TPACKET_ALIGN macro in <linux/if_packet.h>.
-func tPacketAlign(v uintptr) uintptr {
-	return (v + tPacketAlignment - 1) & uintptr(^(tPacketAlignment - 1))
-}
-
-// tPacketReq is the tpacket_req structure as described in
-// https://www.kernel.org/doc/Documentation/networking/packet_mmap.txt
-type tPacketReq struct {
-	tpBlockSize uint32
-	tpBlockNR   uint32
-	tpFrameSize uint32
-	tpFrameNR   uint32
-}
-
-// tPacketHdr is tpacket_hdr structure as described in <linux/if_packet.h>
-type tPacketHdr []byte
-
-const (
-	tpStatusOffset  = 0
-	tpLenOffset     = 8
-	tpSnapLenOffset = 12
-	tpMacOffset     = 16
-	tpNetOffset     = 18
-	tpSecOffset     = 20
-	tpUSecOffset    = 24
-)
-
-func (t tPacketHdr) tpLen() uint32 {
-	return binary.LittleEndian.Uint32(t[tpLenOffset:])
-}
-
-func (t tPacketHdr) tpSnapLen() uint32 {
-	return binary.LittleEndian.Uint32(t[tpSnapLenOffset:])
-}
-
-func (t tPacketHdr) tpMac() uint16 {
-	return binary.LittleEndian.Uint16(t[tpMacOffset:])
-}
-
-func (t tPacketHdr) tpNet() uint16 {
-	return binary.LittleEndian.Uint16(t[tpNetOffset:])
-}
-
-func (t tPacketHdr) tpSec() uint32 {
-	return binary.LittleEndian.Uint32(t[tpSecOffset:])
-}
-
-func (t tPacketHdr) tpUSec() uint32 {
-	return binary.LittleEndian.Uint32(t[tpUSecOffset:])
-}
-
-func (t tPacketHdr) Payload() []byte {
-	return t[uint32(t.tpMac()) : uint32(t.tpMac())+t.tpSnapLen()]
-}
-
-// packetMMapDispatcher uses PACKET_RX_RING's to read/dispatch inbound packets.
-// See: mmap_amd64_unsafe.go for implementation details.
-type packetMMapDispatcher struct {
-	// fd is the file descriptor used to send and receive packets.
-	fd int
-
-	// e is the endpoint this dispatcher is attached to.
-	e *endpoint
-
-	// ringBuffer is only used when PacketMMap dispatcher is used and points
-	// to the start of the mmapped PACKET_RX_RING buffer.
-	ringBuffer []byte
-
-	// ringOffset is the current offset into the ring buffer where the next
-	// inbound packet will be placed by the kernel.
-	ringOffset int
-}
-
-func (d *packetMMapDispatcher) readMMappedPacket() ([]byte, *tcpip.Error) {
-	hdr := tPacketHdr(d.ringBuffer[d.ringOffset*tpFrameSize:])
-	for hdr.tpStatus()&tpStatusUser == 0 {
-		event := rawfile.PollEvent{
-			FD:     int32(d.fd),
-			Events: unix.POLLIN | unix.POLLERR,
-		}
-		if _, errno := rawfile.BlockingPoll(&event, 1, nil); errno != 0 {
-			if errno == syscall.EINTR {
-				continue
-			}
-			return nil, rawfile.TranslateErrno(errno)
-		}
-		if hdr.tpStatus()&tpStatusCopy != 0 {
-			// This frame is truncated so skip it after flipping the
-			// buffer to the kernel.
-			hdr.setTPStatus(tpStatusKernel)
-			d.ringOffset = (d.ringOffset + 1) % tpFrameNR
-			hdr = (tPacketHdr)(d.ringBuffer[d.ringOffset*tpFrameSize:])
-			continue
-		}
-	}
-
-	// Copy out the packet from the mmapped frame to a locally owned buffer.
-	pkt := make([]byte, hdr.tpSnapLen())
-	copy(pkt, hdr.Payload())
-	// Release packet to kernel.
-	hdr.setTPStatus(tpStatusKernel)
-	d.ringOffset = (d.ringOffset + 1) % tpFrameNR
-	return pkt, nil
-}
-
-// dispatch reads packets from an mmaped ring buffer and dispatches them to the
-// network stack.
-func (d *packetMMapDispatcher) dispatch() (bool, *tcpip.Error) {
-	pkt, err := d.readMMappedPacket()
-	if err != nil {
-		return false, err
-	}
-	var (
-		p             tcpip.NetworkProtocolNumber
-		remote, local tcpip.LinkAddress
-	)
-	if d.e.hdrSize > 0 {
-		eth := header.Ethernet(pkt)
-		p = eth.Type()
-		remote = eth.SourceAddress()
-		local = eth.DestinationAddress()
-	} else {
-		// We don't get any indication of what the packet is, so try to guess
-		// if it's an IPv4 or IPv6 packet.
-		switch header.IPVersion(pkt) {
-		case header.IPv4Version:
-			p = header.IPv4ProtocolNumber
-		case header.IPv6Version:
-			p = header.IPv6ProtocolNumber
-		default:
-			return true, nil
-		}
-	}
-
-	pkt = pkt[d.e.hdrSize:]
-	d.e.dispatcher.DeliverNetworkPacket(d.e, remote, local, p, buffer.NewVectorisedView(len(pkt), []buffer.View{buffer.View(pkt)}))
-	return true, nil
-}