networkconfig: support ring_config expectations in proto

Add rx_ring_size and tx_ring_size fields to NicExpectation to support asserting ethtool ring buffer size settings.

PiperOrigin-RevId: 951568512

Author: a-r-n

test_suites/networkconfig/config_expectations/config_expectations.proto

@@ -50,6 +50,10 @@ message NicExpectation {
 
   // Receive queues for this NIC.
   repeated RxQueue rx_queues = 3;
+
+  // Receive and transmit ring buffer sizes for this NIC.
+  int32 rx_ring_size = 4;
+  int32 tx_ring_size = 5;
 }
 
 message RxQueue {

test_suites/networkconfig/config_expectations/config_expectations_test.go

@@ -130,3 +130,19 @@ func TestCPUSets(t *testing.T) {
 		})
 	}
 }
+
+func TestRingSizes(t *testing.T) {
+	c := proto()
+	for _, config := range c.GetConfigExpectations() {
+		t.Run(config.GetDescription(), func(t *testing.T) {
+			for nicIdx, nic := range config.GetNics() {
+				if nic.HasRxRingSize() && nic.GetRxRingSize() <= 0 {
+					t.Errorf("NIC %d: non-positive rx_ring_size %d", nicIdx, nic.GetRxRingSize())
+				}
+				if nic.HasTxRingSize() && nic.GetTxRingSize() <= 0 {
+					t.Errorf("NIC %d: non-positive tx_ring_size %d", nicIdx, nic.GetTxRingSize())
+				}
+			}
+		})
+	}
+}