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BAM! a hit from my spice-weasel. Now TX is zero-copy, at the expense of my sanity!

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This commit is contained in:
JackDoan
2025-11-13 16:29:16 -06:00
parent 994bc8c32b
commit e8ea021bdd
12 changed files with 431 additions and 123 deletions
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48
overlay/tun_linux.go
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@@ -717,17 +717,15 @@ func (t *tun) ReadMany(p []*packet.VirtIOPacket, q int) (int, error) {
func (t *tun) Write(b []byte) (int, error) {
maximum := len(b) //we are RXing
hdr := virtio.NetHdr{ //todo
Flags: unix.VIRTIO_NET_HDR_F_DATA_VALID,
GSOType: unix.VIRTIO_NET_HDR_GSO_NONE,
HdrLen: 0,
GSOSize: 0,
CsumStart: 0,
CsumOffset: 0,
NumBuffers: 0,
//todo garbagey
out := packet.NewOut()
x, err := t.AllocSeg(out, 0)
if err != nil {
return 0, err
}
copy(out.SegmentPayloads[x], b)
err = t.vdev[0].TransmitPacket(out, true)
err := t.vdev[0].TransmitPackets(hdr, [][]byte{b})
if err != nil {
t.l.WithError(err).Error("Transmitting packet")
return 0, err
@@ -735,22 +733,30 @@ func (t *tun) Write(b []byte) (int, error) {
return maximum, nil
}
func (t *tun) WriteMany(b [][]byte, q int) (int, error) {
maximum := len(b) //we are RXing
func (t *tun) AllocSeg(pkt *packet.OutPacket, q int) (int, error) {
idx, buf, err := t.vdev[q].GetPacketForTx()
if err != nil {
return 0, err
}
x := pkt.UseSegment(idx, buf)
return x, nil
}
func (t *tun) WriteOne(x *packet.OutPacket, kick bool, q int) (int, error) {
if err := t.vdev[q].TransmitPacket(x, kick); err != nil {
t.l.WithError(err).Error("Transmitting packet")
return 0, err
}
return 1, nil
}
func (t *tun) WriteMany(x []*packet.OutPacket, q int) (int, error) {
maximum := len(x) //we are RXing
if maximum == 0 {
return 0, nil
}
hdr := virtio.NetHdr{ //todo
Flags: unix.VIRTIO_NET_HDR_F_DATA_VALID,
GSOType: unix.VIRTIO_NET_HDR_GSO_NONE,
HdrLen: 0,
GSOSize: 0,
CsumStart: 0,
CsumOffset: 0,
NumBuffers: 0,
}
err := t.vdev[q].TransmitPackets(hdr, b)
err := t.vdev[q].TransmitPackets(x)
if err != nil {
t.l.WithError(err).Error("Transmitting packet")
return 0, err