test/dm/eth.c - u-boot-mtk - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2015 National Instruments
  *
  * (C) Copyright 2015
  * Joe Hershberger <joe.hershberger@ni.com>
  */

 #include <common.h>
 #include <dm.h>
 #include <env.h>
 #include <fdtdec.h>
 #include <malloc.h>
 #include <net.h>
 #include <dm/test.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
 #include <asm/eth.h>
 #include <test/ut.h>

 #define DM_TEST_ETH_NUM		4

 static int dm_test_eth(struct unit_test_state *uts)
 {
 	net_ping_ip = string_to_ip("1.1.2.2");

 	env_set("ethact", "eth@10002000");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10002000", env_get("ethact"));

 	env_set("ethact", "eth@10003000");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10003000", env_get("ethact"));

 	env_set("ethact", "eth@10004000");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10004000", env_get("ethact"));

 	return 0;
 }
 DM_TEST(dm_test_eth, DM_TESTF_SCAN_FDT);

 static int dm_test_eth_alias(struct unit_test_state *uts)
 {
 	net_ping_ip = string_to_ip("1.1.2.2");
 	env_set("ethact", "eth0");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10002000", env_get("ethact"));

 	env_set("ethact", "eth1");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10004000", env_get("ethact"));

 	/* Expected to fail since eth2 is not defined in the device tree */
 	env_set("ethact", "eth2");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10002000", env_get("ethact"));

 	env_set("ethact", "eth5");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10003000", env_get("ethact"));

 	return 0;
 }
 DM_TEST(dm_test_eth_alias, DM_TESTF_SCAN_FDT);

 static int dm_test_eth_prime(struct unit_test_state *uts)
 {
 	net_ping_ip = string_to_ip("1.1.2.2");

 	/* Expected to be "eth@10003000" because of ethprime variable */
 	env_set("ethact", NULL);
 	env_set("ethprime", "eth5");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10003000", env_get("ethact"));

 	/* Expected to be "eth@10002000" because it is first */
 	env_set("ethact", NULL);
 	env_set("ethprime", NULL);
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10002000", env_get("ethact"));

 	return 0;
 }
 DM_TEST(dm_test_eth_prime, DM_TESTF_SCAN_FDT);

 /**
  * This test case is trying to test the following scenario:
  *	- All ethernet devices are not probed
  *	- "ethaddr" for all ethernet devices are not set
  *	- "ethact" is set to a valid ethernet device name
  *
  * With Sandbox default test configuration, all ethernet devices are
  * probed after power-up, so we have to manually create such scenario:
  *	- Remove all ethernet devices
  *	- Remove all "ethaddr" environment variables
  *	- Set "ethact" to the first ethernet device
  *
  * Do a ping test to see if anything goes wrong.
  */
 static int dm_test_eth_act(struct unit_test_state *uts)
 {
 	struct udevice *dev[DM_TEST_ETH_NUM];
 	const char *ethname[DM_TEST_ETH_NUM] = {"eth@10002000", "eth@10003000",
 						"sbe5", "eth@10004000"};
 	const char *addrname[DM_TEST_ETH_NUM] = {"ethaddr", "eth5addr",
 						 "eth3addr", "eth1addr"};
 	char ethaddr[DM_TEST_ETH_NUM][18];
 	int i;

 	memset(ethaddr, '\0', sizeof(ethaddr));
 	net_ping_ip = string_to_ip("1.1.2.2");

 	/* Prepare the test scenario */
 	for (i = 0; i < DM_TEST_ETH_NUM; i++) {
 		ut_assertok(uclass_find_device_by_name(UCLASS_ETH,
 						       ethname[i], &dev[i]));
 		ut_assertok(device_remove(dev[i], DM_REMOVE_NORMAL));

 		/* Invalidate MAC address */
 		strncpy(ethaddr[i], env_get(addrname[i]), 17);
 		/* Must disable access protection for ethaddr before clearing */
 		env_set(".flags", addrname[i]);
 		env_set(addrname[i], NULL);
 	}

 	/* Set ethact to "eth@10002000" */
 	env_set("ethact", ethname[0]);

 	/* Segment fault might happen if something is wrong */
 	ut_asserteq(-ENODEV, net_loop(PING));

 	for (i = 0; i < DM_TEST_ETH_NUM; i++) {
 		/* Restore the env */
 		env_set(".flags", addrname[i]);
 		env_set(addrname[i], ethaddr[i]);

 		/* Probe the device again */
 		ut_assertok(device_probe(dev[i]));
 	}
 	env_set(".flags", NULL);
 	env_set("ethact", NULL);

 	return 0;
 }
 DM_TEST(dm_test_eth_act, DM_TESTF_SCAN_FDT);

 /* The asserts include a return on fail; cleanup in the caller */
 static int _dm_test_eth_rotate1(struct unit_test_state *uts)
 {
 	/* Make sure that the default is to rotate to the next interface */
 	env_set("ethact", "eth@10004000");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10002000", env_get("ethact"));

 	/* If ethrotate is no, then we should fail on a bad MAC */
 	env_set("ethact", "eth@10004000");
 	env_set("ethrotate", "no");
 	ut_asserteq(-EINVAL, net_loop(PING));
 	ut_asserteq_str("eth@10004000", env_get("ethact"));

 	return 0;
 }

 static int _dm_test_eth_rotate2(struct unit_test_state *uts)
 {
 	/* Make sure we can skip invalid devices */
 	env_set("ethact", "eth@10004000");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10004000", env_get("ethact"));

 	/* Make sure we can handle device name which is not eth# */
 	env_set("ethact", "sbe5");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("sbe5", env_get("ethact"));

 	return 0;
 }

 static int dm_test_eth_rotate(struct unit_test_state *uts)
 {
 	char ethaddr[18];
 	int retval;

 	/* Set target IP to mock ping */
 	net_ping_ip = string_to_ip("1.1.2.2");

 	/* Invalidate eth1's MAC address */
 	memset(ethaddr, '\0', sizeof(ethaddr));
 	strncpy(ethaddr, env_get("eth1addr"), 17);
 	/* Must disable access protection for eth1addr before clearing */
 	env_set(".flags", "eth1addr");
 	env_set("eth1addr", NULL);

 	retval = _dm_test_eth_rotate1(uts);

 	/* Restore the env */
 	env_set("eth1addr", ethaddr);
 	env_set("ethrotate", NULL);

 	if (!retval) {
 		/* Invalidate eth0's MAC address */
 		strncpy(ethaddr, env_get("ethaddr"), 17);
 		/* Must disable access protection for ethaddr before clearing */
 		env_set(".flags", "ethaddr");
 		env_set("ethaddr", NULL);

 		retval = _dm_test_eth_rotate2(uts);

 		/* Restore the env */
 		env_set("ethaddr", ethaddr);
 	}
 	/* Restore the env */
 	env_set(".flags", NULL);

 	return retval;
 }
 DM_TEST(dm_test_eth_rotate, DM_TESTF_SCAN_FDT);

 /* The asserts include a return on fail; cleanup in the caller */
 static int _dm_test_net_retry(struct unit_test_state *uts)
 {
 	/*
 	 * eth1 is disabled and netretry is yes, so the ping should succeed and
 	 * the active device should be eth0
 	 */
 	sandbox_eth_disable_response(1, true);
 	env_set("ethact", "eth@10004000");
 	env_set("netretry", "yes");
 	sandbox_eth_skip_timeout();
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10002000", env_get("ethact"));

 	/*
 	 * eth1 is disabled and netretry is no, so the ping should fail and the
 	 * active device should be eth1
 	 */
 	env_set("ethact", "eth@10004000");
 	env_set("netretry", "no");
 	sandbox_eth_skip_timeout();
 	ut_asserteq(-ENONET, net_loop(PING));
 	ut_asserteq_str("eth@10004000", env_get("ethact"));

 	return 0;
 }

 static int dm_test_net_retry(struct unit_test_state *uts)
 {
 	int retval;

 	net_ping_ip = string_to_ip("1.1.2.2");

 	retval = _dm_test_net_retry(uts);

 	/* Restore the env */
 	env_set("netretry", NULL);
 	sandbox_eth_disable_response(1, false);

 	return retval;
 }
 DM_TEST(dm_test_net_retry, DM_TESTF_SCAN_FDT);

 static int sb_check_arp_reply(struct udevice *dev, void *packet,
 			      unsigned int len)
 {
 	struct eth_sandbox_priv *priv = dev_get_priv(dev);
 	struct ethernet_hdr *eth = packet;
 	struct arp_hdr *arp;
 	/* Used by all of the ut_assert macros */
 	struct unit_test_state *uts = priv->priv;

 	if (ntohs(eth->et_protlen) != PROT_ARP)
 		return 0;

 	arp = packet + ETHER_HDR_SIZE;

 	if (ntohs(arp->ar_op) != ARPOP_REPLY)
 		return 0;

 	/* This test would be worthless if we are not waiting */
 	ut_assert(arp_is_waiting());

 	/* Validate response */
 	ut_assert(memcmp(eth->et_src, net_ethaddr, ARP_HLEN) == 0);
 	ut_assert(memcmp(eth->et_dest, priv->fake_host_hwaddr, ARP_HLEN) == 0);
 	ut_assert(eth->et_protlen == htons(PROT_ARP));

 	ut_assert(arp->ar_hrd == htons(ARP_ETHER));
 	ut_assert(arp->ar_pro == htons(PROT_IP));
 	ut_assert(arp->ar_hln == ARP_HLEN);
 	ut_assert(arp->ar_pln == ARP_PLEN);
 	ut_assert(memcmp(&arp->ar_sha, net_ethaddr, ARP_HLEN) == 0);
 	ut_assert(net_read_ip(&arp->ar_spa).s_addr == net_ip.s_addr);
 	ut_assert(memcmp(&arp->ar_tha, priv->fake_host_hwaddr, ARP_HLEN) == 0);
 	ut_assert(net_read_ip(&arp->ar_tpa).s_addr ==
 		  string_to_ip("1.1.2.4").s_addr);

 	return 0;
 }

 static int sb_with_async_arp_handler(struct udevice *dev, void *packet,
 				     unsigned int len)
 {
 	struct eth_sandbox_priv *priv = dev_get_priv(dev);
 	struct ethernet_hdr *eth = packet;
 	struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
 	int ret;

 	/*
 	 * If we are about to generate a reply to ARP, first inject a request
 	 * from another host
 	 */
 	if (ntohs(eth->et_protlen) == PROT_ARP &&
 	    ntohs(arp->ar_op) == ARPOP_REQUEST) {
 		/* Make sure sandbox_eth_recv_arp_req() knows who is asking */
 		priv->fake_host_ipaddr = string_to_ip("1.1.2.4");

 		ret = sandbox_eth_recv_arp_req(dev);
 		if (ret)
 			return ret;
 	}

 	sandbox_eth_arp_req_to_reply(dev, packet, len);
 	sandbox_eth_ping_req_to_reply(dev, packet, len);

 	return sb_check_arp_reply(dev, packet, len);
 }

 static int dm_test_eth_async_arp_reply(struct unit_test_state *uts)
 {
 	net_ping_ip = string_to_ip("1.1.2.2");

 	sandbox_eth_set_tx_handler(0, sb_with_async_arp_handler);
 	/* Used by all of the ut_assert macros in the tx_handler */
 	sandbox_eth_set_priv(0, uts);

 	env_set("ethact", "eth@10002000");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10002000", env_get("ethact"));

 	sandbox_eth_set_tx_handler(0, NULL);

 	return 0;
 }

 DM_TEST(dm_test_eth_async_arp_reply, DM_TESTF_SCAN_FDT);

 static int sb_check_ping_reply(struct udevice *dev, void *packet,
 			       unsigned int len)
 {
 	struct eth_sandbox_priv *priv = dev_get_priv(dev);
 	struct ethernet_hdr *eth = packet;
 	struct ip_udp_hdr *ip;
 	struct icmp_hdr *icmp;
 	/* Used by all of the ut_assert macros */
 	struct unit_test_state *uts = priv->priv;

 	if (ntohs(eth->et_protlen) != PROT_IP)
 		return 0;

 	ip = packet + ETHER_HDR_SIZE;

 	if (ip->ip_p != IPPROTO_ICMP)
 		return 0;

 	icmp = (struct icmp_hdr *)&ip->udp_src;

 	if (icmp->type != ICMP_ECHO_REPLY)
 		return 0;

 	/* This test would be worthless if we are not waiting */
 	ut_assert(arp_is_waiting());

 	/* Validate response */
 	ut_assert(memcmp(eth->et_src, net_ethaddr, ARP_HLEN) == 0);
 	ut_assert(memcmp(eth->et_dest, priv->fake_host_hwaddr, ARP_HLEN) == 0);
 	ut_assert(eth->et_protlen == htons(PROT_IP));

 	ut_assert(net_read_ip(&ip->ip_src).s_addr == net_ip.s_addr);
 	ut_assert(net_read_ip(&ip->ip_dst).s_addr ==
 		  string_to_ip("1.1.2.4").s_addr);

 	return 0;
 }

 static int sb_with_async_ping_handler(struct udevice *dev, void *packet,
 				      unsigned int len)
 {
 	struct eth_sandbox_priv *priv = dev_get_priv(dev);
 	struct ethernet_hdr *eth = packet;
 	struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
 	int ret;

 	/*
 	 * If we are about to generate a reply to ARP, first inject a request
 	 * from another host
 	 */
 	if (ntohs(eth->et_protlen) == PROT_ARP &&
 	    ntohs(arp->ar_op) == ARPOP_REQUEST) {
 		/* Make sure sandbox_eth_recv_arp_req() knows who is asking */
 		priv->fake_host_ipaddr = string_to_ip("1.1.2.4");

 		ret = sandbox_eth_recv_ping_req(dev);
 		if (ret)
 			return ret;
 	}

 	sandbox_eth_arp_req_to_reply(dev, packet, len);
 	sandbox_eth_ping_req_to_reply(dev, packet, len);

 	return sb_check_ping_reply(dev, packet, len);
 }

 static int dm_test_eth_async_ping_reply(struct unit_test_state *uts)
 {
 	net_ping_ip = string_to_ip("1.1.2.2");

 	sandbox_eth_set_tx_handler(0, sb_with_async_ping_handler);
 	/* Used by all of the ut_assert macros in the tx_handler */
 	sandbox_eth_set_priv(0, uts);

 	env_set("ethact", "eth@10002000");
 	ut_assertok(net_loop(PING));
 	ut_asserteq_str("eth@10002000", env_get("ethact"));

 	sandbox_eth_set_tx_handler(0, NULL);

 	return 0;
 }

 DM_TEST(dm_test_eth_async_ping_reply, DM_TESTF_SCAN_FDT);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2015 National Instruments
	*
	* (C) Copyright 2015
	* Joe Hershberger <joe.hershberger@ni.com>
	*/

	#include <common.h>
	#include <dm.h>
	#include <env.h>
	#include <fdtdec.h>
	#include <malloc.h>
	#include <net.h>
	#include <dm/test.h>
	#include <dm/device-internal.h>
	#include <dm/uclass-internal.h>
	#include <asm/eth.h>
	#include <test/ut.h>

	#define DM_TEST_ETH_NUM 4

	static int dm_test_eth(struct unit_test_state *uts)
	{
	net_ping_ip = string_to_ip("1.1.2.2");

	env_set("ethact", "eth@10002000");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10002000", env_get("ethact"));

	env_set("ethact", "eth@10003000");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10003000", env_get("ethact"));

	env_set("ethact", "eth@10004000");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10004000", env_get("ethact"));

	return 0;
	}
	DM_TEST(dm_test_eth, DM_TESTF_SCAN_FDT);

	static int dm_test_eth_alias(struct unit_test_state *uts)
	{
	net_ping_ip = string_to_ip("1.1.2.2");
	env_set("ethact", "eth0");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10002000", env_get("ethact"));

	env_set("ethact", "eth1");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10004000", env_get("ethact"));

	/* Expected to fail since eth2 is not defined in the device tree */
	env_set("ethact", "eth2");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10002000", env_get("ethact"));

	env_set("ethact", "eth5");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10003000", env_get("ethact"));

	return 0;
	}
	DM_TEST(dm_test_eth_alias, DM_TESTF_SCAN_FDT);

	static int dm_test_eth_prime(struct unit_test_state *uts)
	{
	net_ping_ip = string_to_ip("1.1.2.2");

	/* Expected to be "eth@10003000" because of ethprime variable */
	env_set("ethact", NULL);
	env_set("ethprime", "eth5");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10003000", env_get("ethact"));

	/* Expected to be "eth@10002000" because it is first */
	env_set("ethact", NULL);
	env_set("ethprime", NULL);
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10002000", env_get("ethact"));

	return 0;
	}
	DM_TEST(dm_test_eth_prime, DM_TESTF_SCAN_FDT);

	/**
	* This test case is trying to test the following scenario:
	* - All ethernet devices are not probed
	* - "ethaddr" for all ethernet devices are not set
	* - "ethact" is set to a valid ethernet device name
	*
	* With Sandbox default test configuration, all ethernet devices are
	* probed after power-up, so we have to manually create such scenario:
	* - Remove all ethernet devices
	* - Remove all "ethaddr" environment variables
	* - Set "ethact" to the first ethernet device
	*
	* Do a ping test to see if anything goes wrong.
	*/
	static int dm_test_eth_act(struct unit_test_state *uts)
	{
	struct udevice *dev[DM_TEST_ETH_NUM];
	const char *ethname[DM_TEST_ETH_NUM] = {"eth@10002000", "eth@10003000",
	"sbe5", "eth@10004000"};
	const char *addrname[DM_TEST_ETH_NUM] = {"ethaddr", "eth5addr",
	"eth3addr", "eth1addr"};
	char ethaddr[DM_TEST_ETH_NUM][18];
	int i;

	memset(ethaddr, '\0', sizeof(ethaddr));
	net_ping_ip = string_to_ip("1.1.2.2");

	/* Prepare the test scenario */
	for (i = 0; i < DM_TEST_ETH_NUM; i++) {
	ut_assertok(uclass_find_device_by_name(UCLASS_ETH,
	ethname[i], &dev[i]));
	ut_assertok(device_remove(dev[i], DM_REMOVE_NORMAL));

	/* Invalidate MAC address */
	strncpy(ethaddr[i], env_get(addrname[i]), 17);
	/* Must disable access protection for ethaddr before clearing */
	env_set(".flags", addrname[i]);
	env_set(addrname[i], NULL);
	}

	/* Set ethact to "eth@10002000" */
	env_set("ethact", ethname[0]);

	/* Segment fault might happen if something is wrong */
	ut_asserteq(-ENODEV, net_loop(PING));

	for (i = 0; i < DM_TEST_ETH_NUM; i++) {
	/* Restore the env */
	env_set(".flags", addrname[i]);
	env_set(addrname[i], ethaddr[i]);

	/* Probe the device again */
	ut_assertok(device_probe(dev[i]));
	}
	env_set(".flags", NULL);
	env_set("ethact", NULL);

	return 0;
	}
	DM_TEST(dm_test_eth_act, DM_TESTF_SCAN_FDT);

	/* The asserts include a return on fail; cleanup in the caller */
	static int _dm_test_eth_rotate1(struct unit_test_state *uts)
	{
	/* Make sure that the default is to rotate to the next interface */
	env_set("ethact", "eth@10004000");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10002000", env_get("ethact"));

	/* If ethrotate is no, then we should fail on a bad MAC */
	env_set("ethact", "eth@10004000");
	env_set("ethrotate", "no");
	ut_asserteq(-EINVAL, net_loop(PING));
	ut_asserteq_str("eth@10004000", env_get("ethact"));

	return 0;
	}

	static int _dm_test_eth_rotate2(struct unit_test_state *uts)
	{
	/* Make sure we can skip invalid devices */
	env_set("ethact", "eth@10004000");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10004000", env_get("ethact"));

	/* Make sure we can handle device name which is not eth# */
	env_set("ethact", "sbe5");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("sbe5", env_get("ethact"));

	return 0;
	}

	static int dm_test_eth_rotate(struct unit_test_state *uts)
	{
	char ethaddr[18];
	int retval;

	/* Set target IP to mock ping */
	net_ping_ip = string_to_ip("1.1.2.2");

	/* Invalidate eth1's MAC address */
	memset(ethaddr, '\0', sizeof(ethaddr));
	strncpy(ethaddr, env_get("eth1addr"), 17);
	/* Must disable access protection for eth1addr before clearing */
	env_set(".flags", "eth1addr");
	env_set("eth1addr", NULL);

	retval = _dm_test_eth_rotate1(uts);

	/* Restore the env */
	env_set("eth1addr", ethaddr);
	env_set("ethrotate", NULL);

	if (!retval) {
	/* Invalidate eth0's MAC address */
	strncpy(ethaddr, env_get("ethaddr"), 17);
	/* Must disable access protection for ethaddr before clearing */
	env_set(".flags", "ethaddr");
	env_set("ethaddr", NULL);

	retval = _dm_test_eth_rotate2(uts);

	/* Restore the env */
	env_set("ethaddr", ethaddr);
	}
	/* Restore the env */
	env_set(".flags", NULL);

	return retval;
	}
	DM_TEST(dm_test_eth_rotate, DM_TESTF_SCAN_FDT);

	/* The asserts include a return on fail; cleanup in the caller */
	static int _dm_test_net_retry(struct unit_test_state *uts)
	{
	/*
	* eth1 is disabled and netretry is yes, so the ping should succeed and
	* the active device should be eth0
	*/
	sandbox_eth_disable_response(1, true);
	env_set("ethact", "eth@10004000");
	env_set("netretry", "yes");
	sandbox_eth_skip_timeout();
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10002000", env_get("ethact"));

	/*
	* eth1 is disabled and netretry is no, so the ping should fail and the
	* active device should be eth1
	*/
	env_set("ethact", "eth@10004000");
	env_set("netretry", "no");
	sandbox_eth_skip_timeout();
	ut_asserteq(-ENONET, net_loop(PING));
	ut_asserteq_str("eth@10004000", env_get("ethact"));

	return 0;
	}

	static int dm_test_net_retry(struct unit_test_state *uts)
	{
	int retval;

	net_ping_ip = string_to_ip("1.1.2.2");

	retval = _dm_test_net_retry(uts);

	/* Restore the env */
	env_set("netretry", NULL);
	sandbox_eth_disable_response(1, false);

	return retval;
	}
	DM_TEST(dm_test_net_retry, DM_TESTF_SCAN_FDT);

	static int sb_check_arp_reply(struct udevice dev, void packet,
	unsigned int len)
	{
	struct eth_sandbox_priv *priv = dev_get_priv(dev);
	struct ethernet_hdr *eth = packet;
	struct arp_hdr *arp;
	/* Used by all of the ut_assert macros */
	struct unit_test_state *uts = priv->priv;

	if (ntohs(eth->et_protlen) != PROT_ARP)
	return 0;

	arp = packet + ETHER_HDR_SIZE;

	if (ntohs(arp->ar_op) != ARPOP_REPLY)
	return 0;

	/* This test would be worthless if we are not waiting */
	ut_assert(arp_is_waiting());

	/* Validate response */
	ut_assert(memcmp(eth->et_src, net_ethaddr, ARP_HLEN) == 0);
	ut_assert(memcmp(eth->et_dest, priv->fake_host_hwaddr, ARP_HLEN) == 0);
	ut_assert(eth->et_protlen == htons(PROT_ARP));

	ut_assert(arp->ar_hrd == htons(ARP_ETHER));
	ut_assert(arp->ar_pro == htons(PROT_IP));
	ut_assert(arp->ar_hln == ARP_HLEN);
	ut_assert(arp->ar_pln == ARP_PLEN);
	ut_assert(memcmp(&arp->ar_sha, net_ethaddr, ARP_HLEN) == 0);
	ut_assert(net_read_ip(&arp->ar_spa).s_addr == net_ip.s_addr);
	ut_assert(memcmp(&arp->ar_tha, priv->fake_host_hwaddr, ARP_HLEN) == 0);
	ut_assert(net_read_ip(&arp->ar_tpa).s_addr ==
	string_to_ip("1.1.2.4").s_addr);

	return 0;
	}

	static int sb_with_async_arp_handler(struct udevice dev, void packet,
	unsigned int len)
	{
	struct eth_sandbox_priv *priv = dev_get_priv(dev);
	struct ethernet_hdr *eth = packet;
	struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
	int ret;

	/*
	* If we are about to generate a reply to ARP, first inject a request
	* from another host
	*/
	if (ntohs(eth->et_protlen) == PROT_ARP &&
	ntohs(arp->ar_op) == ARPOP_REQUEST) {
	/* Make sure sandbox_eth_recv_arp_req() knows who is asking */
	priv->fake_host_ipaddr = string_to_ip("1.1.2.4");

	ret = sandbox_eth_recv_arp_req(dev);
	if (ret)
	return ret;
	}

	sandbox_eth_arp_req_to_reply(dev, packet, len);
	sandbox_eth_ping_req_to_reply(dev, packet, len);

	return sb_check_arp_reply(dev, packet, len);
	}

	static int dm_test_eth_async_arp_reply(struct unit_test_state *uts)
	{
	net_ping_ip = string_to_ip("1.1.2.2");

	sandbox_eth_set_tx_handler(0, sb_with_async_arp_handler);
	/* Used by all of the ut_assert macros in the tx_handler */
	sandbox_eth_set_priv(0, uts);

	env_set("ethact", "eth@10002000");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10002000", env_get("ethact"));

	sandbox_eth_set_tx_handler(0, NULL);

	return 0;
	}

	DM_TEST(dm_test_eth_async_arp_reply, DM_TESTF_SCAN_FDT);

	static int sb_check_ping_reply(struct udevice dev, void packet,
	unsigned int len)
	{
	struct eth_sandbox_priv *priv = dev_get_priv(dev);
	struct ethernet_hdr *eth = packet;
	struct ip_udp_hdr *ip;
	struct icmp_hdr *icmp;
	/* Used by all of the ut_assert macros */
	struct unit_test_state *uts = priv->priv;

	if (ntohs(eth->et_protlen) != PROT_IP)
	return 0;

	ip = packet + ETHER_HDR_SIZE;

	if (ip->ip_p != IPPROTO_ICMP)
	return 0;

	icmp = (struct icmp_hdr *)&ip->udp_src;

	if (icmp->type != ICMP_ECHO_REPLY)
	return 0;

	/* This test would be worthless if we are not waiting */
	ut_assert(arp_is_waiting());

	/* Validate response */
	ut_assert(memcmp(eth->et_src, net_ethaddr, ARP_HLEN) == 0);
	ut_assert(memcmp(eth->et_dest, priv->fake_host_hwaddr, ARP_HLEN) == 0);
	ut_assert(eth->et_protlen == htons(PROT_IP));

	ut_assert(net_read_ip(&ip->ip_src).s_addr == net_ip.s_addr);
	ut_assert(net_read_ip(&ip->ip_dst).s_addr ==
	string_to_ip("1.1.2.4").s_addr);

	return 0;
	}

	static int sb_with_async_ping_handler(struct udevice dev, void packet,
	unsigned int len)
	{
	struct eth_sandbox_priv *priv = dev_get_priv(dev);
	struct ethernet_hdr *eth = packet;
	struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
	int ret;

	/*
	* If we are about to generate a reply to ARP, first inject a request
	* from another host
	*/
	if (ntohs(eth->et_protlen) == PROT_ARP &&
	ntohs(arp->ar_op) == ARPOP_REQUEST) {
	/* Make sure sandbox_eth_recv_arp_req() knows who is asking */
	priv->fake_host_ipaddr = string_to_ip("1.1.2.4");

	ret = sandbox_eth_recv_ping_req(dev);
	if (ret)
	return ret;
	}

	sandbox_eth_arp_req_to_reply(dev, packet, len);
	sandbox_eth_ping_req_to_reply(dev, packet, len);

	return sb_check_ping_reply(dev, packet, len);
	}

	static int dm_test_eth_async_ping_reply(struct unit_test_state *uts)
	{
	net_ping_ip = string_to_ip("1.1.2.2");

	sandbox_eth_set_tx_handler(0, sb_with_async_ping_handler);
	/* Used by all of the ut_assert macros in the tx_handler */
	sandbox_eth_set_priv(0, uts);

	env_set("ethact", "eth@10002000");
	ut_assertok(net_loop(PING));
	ut_asserteq_str("eth@10002000", env_get("ethact"));

	sandbox_eth_set_tx_handler(0, NULL);

	return 0;
	}

	DM_TEST(dm_test_eth_async_ping_reply, DM_TESTF_SCAN_FDT);