[UBOOT PATCH v4] test/py: net: Add dhcp abort test

[Love Kumar]

Abort the dhcp request in the middle by pressing ctrl + c on u-boot
prompt and validate the abort status.

Signed-off-by: Love Kumar <love.kumar at amd.com>
---
Changes in v2:
 - Mark CMD_MII command dependency

Changes in v3:
 - Skip the test if PHY device not present

Changes in v4:
 - Setup the network configuration by running dhcp test at the end of
 test
 - Add option to skip the test if it is not desired or possible
---
 test/py/tests/test_net.py | 57 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/test/py/tests/test_net.py b/test/py/tests/test_net.py
index b2241ae6a482..e0749125fd53 100644
--- a/test/py/tests/test_net.py
+++ b/test/py/tests/test_net.py
@@ -7,6 +7,7 @@
 import pytest
 import u_boot_utils
 import uuid
+import re
 
 """
 Note: This test relies on boardenv_* containing configuration values to define
@@ -30,6 +31,11 @@ env__net_uses_pci = True
 # set to False.
 env__net_dhcp_server = True
 
+# False or omitted if a DHCP server is attached to the network, and dhcp abort
+# case should be tested.
+# If DHCP abort testing is not possible or desired, set this variable to True.
+env__dhcp_abort_test_skip = True
+
 # True if a DHCPv6 server is attached to the network, and should be tested.
 # If DHCPv6 testing is not possible or desired, this variable may be omitted or
 # set to False.
@@ -115,6 +121,57 @@ def test_net_dhcp(u_boot_console):
     global net_set_up
     net_set_up = True
 
+ at pytest.mark.buildconfigspec("cmd_dhcp")
+ at pytest.mark.buildconfigspec("cmd_mii")
+def test_net_dhcp_abort(u_boot_console):
+    """Test the dhcp command by pressing ctrl+c in the middle of dhcp request
+
+    The boardenv_* file may be used to enable/disable this test; see the
+    comment at the beginning of this file.
+    """
+
+    test_dhcp = u_boot_console.config.env.get("env__net_dhcp_server", False)
+    if not test_dhcp:
+        pytest.skip("No DHCP server available")
+
+    if u_boot_console.config.env.get("env__dhcp_abort_test_skip", False):
+        pytest.skip("DHCP abort test is not enabled!")
+
+    u_boot_console.run_command("setenv autoload no")
+
+    # Phy reset before running dhcp command
+    output = u_boot_console.run_command("mii device")
+    if not re.search(r"Current device: '(.+?)'", output):
+        pytest.skip("PHY device does not exist!")
+    eth_num = re.search(r"Current device: '(.+?)'", output).groups()[0]
+    u_boot_console.run_command(f"mii device {eth_num}")
+    output = u_boot_console.run_command("mii info")
+    eth_addr = hex(int(re.search(r"PHY (.+?):", output).groups()[0], 16))
+    u_boot_console.run_command(f"mii modify {eth_addr} 0 0x8000 0x8000")
+
+    u_boot_console.run_command("dhcp", wait_for_prompt=False)
+    try:
+        u_boot_console.wait_for("Waiting for PHY auto negotiation to complete")
+    except:
+        pytest.skip("Timeout waiting for PHY auto negotiation to complete")
+
+    u_boot_console.wait_for("done")
+
+    # Sending Ctrl-C
+    output = u_boot_console.run_command(
+        chr(3), wait_for_echo=False, send_nl=False
+    )
+
+    assert "TIMEOUT" not in output
+    assert "DHCP client bound to address " not in output
+    assert "Abort" in output
+
+    # Provide a time to recover from Abort - if it is not performed
+    # There is message like: ethernet at ff0e0000: No link.
+    u_boot_console.run_command("sleep 1")
+    # Run the dhcp test to setup the network configuration
+    test_net_dhcp(u_boot_console)
+
 @pytest.mark.buildconfigspec('cmd_dhcp6')
 def test_net_dhcp6(u_boot_console):
     """Test the dhcp6 command.
-- 
2.25.1