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u-boot/test/dm/eth.c
Joe Hershberger ac3f26cc15 net: Don't overwrite waiting packets with asynchronous replies 
Peter originally sent a fix, but it breaks a number of other things.
This addresses the original reported issue in a different way.

That report was:

> U-Boot has 1 common buffer to send Ethernet frames, pointed to by
> net_tx_packet.  When sending to an IP address without knowing the MAC
> address, U-Boot makes an ARP request (using the arp_tx_packet buffer)
> to find out the MAC address of the IP addressr. When a matching ARP
> reply is received, U-Boot continues sending the frame stored in the
> net_tx_packet buffer.
>
> However, in the mean time, if U-Boot needs to send out any network
> packets (e.g. replying ping packets or ARP requests for its own IP
> address etc.), it will use the net_tx_packet buffer to prepare the
> new packet. Thus this buffer is no longer the original packet meant
> to be transmitted after the ARP reply. The original packet will be
> lost.

This instead uses the ARP tx buffer to send async replies in the case
where we are actively waiting for an ARP reply.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

Reported-by: Tran Tien Dat <peter.trantiendat@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
2018-10-10 12:29:01 -05:00

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// 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 <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(-ETIMEDOUT, 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);
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