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This commit is contained in:
JackDoan
2026-04-28 10:07:40 -05:00
parent d1ea33659a
commit b9a7d1edf3
1 changed files with 12 additions and 16 deletions
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20
overlay/tio/tio_gso_linux.go
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@@ -54,12 +54,6 @@ type Offload struct {
segBuf []byte // backing store for segmented output segBuf []byte // backing store for segmented output
segOff int // cursor into segBuf for the current Read drain segOff int // cursor into segBuf for the current Read drain
pending [][]byte // segments returned from the most recent Read pending [][]byte // segments returned from the most recent Read
writeIovs [2]unix.Iovec // preallocated iovecs for Write (coalescer passthrough); iovs[0] is fixed to validVnetHdr
// rejectIovs is a second preallocated iovec scratch used exclusively by
// WriteFromSelf (reject + self-forward from the inside path). It mirrors
// writeIovs but lets listenIn goroutines emit reject packets without
// racing with the listenOut coalescer that owns writeIovs.
rejectIovs [2]unix.Iovec
// gsoHdrBuf is a per-queue 10-byte scratch for the virtio_net_hdr emitted // gsoHdrBuf is a per-queue 10-byte scratch for the virtio_net_hdr emitted
// by WriteGSO. Separate from validVnetHdr so a concurrent non-GSO Write on // by WriteGSO. Separate from validVnetHdr so a concurrent non-GSO Write on
@@ -94,10 +88,6 @@ func newOffload(fd int, shutdownFd int) (*Offload, error) {
gsoIovs: make([]unix.Iovec, 2, 2+gsoInitialPayIovs), gsoIovs: make([]unix.Iovec, 2, 2+gsoInitialPayIovs),
} }
out.writeIovs[0].Base = &validVnetHdr[0]
out.writeIovs[0].SetLen(virtioNetHdrLen)
out.rejectIovs[0].Base = &validVnetHdr[0]
out.rejectIovs[0].SetLen(virtioNetHdrLen)
out.gsoIovs[0].Base = &out.gsoHdrBuf[0] out.gsoIovs[0].Base = &out.gsoHdrBuf[0]
out.gsoIovs[0].SetLen(virtioNetHdrLen) out.gsoIovs[0].SetLen(virtioNetHdrLen)
@@ -242,7 +232,13 @@ func (r *Offload) decodeRead(n int) error {
} }
func (r *Offload) Write(buf []byte) (int, error) { func (r *Offload) Write(buf []byte) (int, error) {
return r.writeWithScratch(buf, &r.writeIovs) iovs := [2]unix.Iovec{
{Base: &validVnetHdr[0]},
{Base: &buf[0]},
}
iovs[0].SetLen(virtioNetHdrLen)
iovs[1].SetLen(len(buf))
return r.writeWithScratch(buf, &iovs)
} }
// WriteFromSelf emits a packet using a dedicated iovec scratch (rejectIovs) // WriteFromSelf emits a packet using a dedicated iovec scratch (rejectIovs)
@@ -251,7 +247,7 @@ func (r *Offload) Write(buf []byte) (int, error) {
// self-forward packets and the outside (listenOut) goroutine flushing TCP // self-forward packets and the outside (listenOut) goroutine flushing TCP
// coalescer passthroughs on the same Offload. // coalescer passthroughs on the same Offload.
func (r *Offload) WriteFromSelf(buf []byte) (int, error) { func (r *Offload) WriteFromSelf(buf []byte) (int, error) {
return r.writeWithScratch(buf, &r.rejectIovs) return r.Write(buf)
} }
func (r *Offload) writeWithScratch(buf []byte, iovs *[2]unix.Iovec) (int, error) { func (r *Offload) writeWithScratch(buf []byte, iovs *[2]unix.Iovec) (int, error) {