const MTU = 1500

type Options struct {
	// FD is used to read/write packets.
	FD int

	// ClosedFunc is a function to be called when an endpoint's peer (if
	// any) closes its end of the communication pipe.
	ClosedFunc func(tcpip.Error)

	// Address is the link address for this endpoint.
	Address tcpip.LinkAddress

	// SaveRestore if true, indicates that this NIC capability set should
	// include CapabilitySaveRestore
	SaveRestore bool

	// DisconnectOk if true, indicates that this NIC capability set should
	// include CapabilityDisconnectOk.
	DisconnectOk bool

	// TXChecksumOffload if true, indicates that this endpoints capability
	// set should include CapabilityTXChecksumOffload.
	TXChecksumOffload bool

	// RXChecksumOffload if true, indicates that this endpoints capability
	// set should include CapabilityRXChecksumOffload.
	RXChecksumOffload bool

	// InterfaceIndex is the interface index of the underlying device.
	InterfaceIndex int

	// Bind is true when we're responsible for binding the AF_XDP socket to
	// a device. When false, another process is expected to bind for us.
	Bind bool

	// GRO enables generic receive offload.
	GRO bool
}