[PATCH net-next 2/3] selftests: lan743x: Add testcase to check speed and duplex state of lan743x

[Mohan Prasad J]

Add testcase for checking speed and duplex states for
lan743x network driver.
Testcase comprises of varying the network speed and duplex
state to 10/100/1000Mbps and half/full via ethtool.

Signed-off-by: Mohan Prasad J <mohan.prasad@xxxxxxxxxxxxx>
---
 .../net/hw/microchip/lan743x/lan743x.py       | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tools/testing/selftests/drivers/net/hw/microchip/lan743x/lan743x.py b/tools/testing/selftests/drivers/net/hw/microchip/lan743x/lan743x.py
index f1ad97dc2..59f0be2a7 100755
--- a/tools/testing/selftests/drivers/net/hw/microchip/lan743x/lan743x.py
+++ b/tools/testing/selftests/drivers/net/hw/microchip/lan743x/lan743x.py
@@ -36,12 +36,45 @@ def verify_autonegotiation(ifname: str, expected_state: str) -> None:
     actual_state = autoneg_match.group(1)
     ksft_eq(actual_state, expected_state)
 
+def set_speed_and_duplex(ifname: str, speed: str, duplex: str) -> None:
+    """Set the speed and duplex state for the interface"""
+    process = ethtool(f"--change {ifname} speed {speed} duplex {duplex} autoneg on")
+
+    if process.ret != 0:
+        raise KsftFailEx(f"Not able to set speeed and duplex parameters for {ifname}")
+    ksft_pr(f"Speed: {speed} Mbps, Duplex: {duplex} set for Interface: {ifname}")
+
+def verify_speed_and_duplex(ifname: str, expected_speed: str, expected_duplex: str) -> None:
+    verify_link_up(ifname)
+    """Verifying the speed and duplex state for the interface"""
+    output = ethtool(f"{ifname}")
+    with open(f"/sys/class/net/{ifname}/speed", "r") as fp:
+        actual_speed = fp.read().strip()
+    with open(f"/sys/class/net/{ifname}/duplex", "r") as fp:
+        actual_duplex = fp.read().strip()
+
+    ksft_eq(actual_speed, expected_speed)
+    ksft_eq(actual_duplex, expected_duplex)
+
 def test_autonegotiation(cfg) -> None:
     for state in ["off", "on"]:
         set_autonegotiation_state(cfg.ifname, state)
         time.sleep(5)
         verify_autonegotiation(cfg.ifname, state)
 
+def test_network_speed(cfg) -> None:
+    speeds = ["10", "100", "1000"]
+    duplex_modes = ["half", "full"]
+
+    for speed in speeds:
+        for duplex in duplex_modes:
+            # Skip for speed = 1000Mbps, duplex = Half
+            if speed == "1000" and duplex == "half":
+                continue
+            set_speed_and_duplex(cfg.ifname, speed, duplex)
+            time.sleep(5)
+            verify_speed_and_duplex(cfg.ifname, speed, duplex)
+
 def main() -> None:
     with NetDrvEpEnv(__file__) as cfg:
         ksft_run(globs=globals(), case_pfx={"test_"}, args=(cfg,))
-- 
2.43.0