Convey GSO capabilities through GSOEndpoint

...as all GSO capable endpoints must implement GSOEndpoint.

PiperOrigin-RevId: 371804175

1 files changed, 12 insertions, 1 deletions

diff --git a/pkg/tcpip/link/qdisc/fifo/endpoint.go b/pkg/tcpip/link/qdisc/fifo/endpoint.go
index bba6a6973..b1a28491d 100644
--- a/pkg/tcpip/link/qdisc/fifo/endpoint.go
+++ b/pkg/tcpip/link/qdisc/fifo/endpoint.go
@@ -25,6 +25,9 @@ import (
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 )
 
+var _ stack.LinkEndpoint = (*endpoint)(nil)
+var _ stack.GSOEndpoint = (*endpoint)(nil)
+
 // endpoint represents a LinkEndpoint which implements a FIFO queue for all
 // outgoing packets. endpoint can have 1 or more underlying queueDispatchers.
 // All outgoing packets are consistenly hashed to a single underlying queue
@@ -141,7 +144,7 @@ func (e *endpoint) LinkAddress() tcpip.LinkAddress {
 	return e.lower.LinkAddress()
 }
 
-// GSOMaxSize returns the maximum GSO packet size.
+// GSOMaxSize implements stack.GSOEndpoint.
 func (e *endpoint) GSOMaxSize() uint32 {
 	if gso, ok := e.lower.(stack.GSOEndpoint); ok {
 		return gso.GSOMaxSize()
@@ -149,6 +152,14 @@ func (e *endpoint) GSOMaxSize() uint32 {
 	return 0
 }
 
+// SupportedGSO implements stack.GSOEndpoint.
+func (e *endpoint) SupportedGSO() stack.SupportedGSO {
+	if gso, ok := e.lower.(stack.GSOEndpoint); ok {
+		return gso.SupportedGSO()
+	}
+	return stack.GSONotSupported
+}
+
 // WritePacket implements stack.LinkEndpoint.WritePacket.
 //
 // The packet must have the following fields populated: