RTEMS 5.1 Release LibBSD Networking Issue - FIXED
Rick VanderWal
rvanderwal at bellsouth.net
Tue Nov 10 14:37:13 UTC 2020
Hey Chris, (and RTEMS users)
Thanks for the response and suggested alternative method of setting the
MAC address. After changing to your method, I found I still had the same
issues with networking. However, I did discover and fix my issue and it
doesn't have anything to do with RTEMS. Sorry!
After doing some more research I found that I was setting the first
octet of the MAC address to 0x0f, which because the lowest bit is a 1,
is a Multicast MAC address and not a Unicast address. It was therefore
not being passed up to the network stack.
Lesson: Don't just randomly select an odd number for the first octet of
your MAC address for testing.
Have a great day!
Thanks again,
-Rick
On 11/8/20 6:17 PM, Chris Johns wrote:
> On 6/11/20 2:19 am, rvanderwal wrote:
>> Good Morning,
>>
>> I seem to be having an issue with RTEMS 5.1 Release Libbsd networking when I
>> include my own 'rtems_bsd_get_mac_address' function as described in
>> rtemsbsd/include/rtems/bsd/bsd.h. I'm running on a Xilinx Microzed using
>> xilinx_zynq_zedboard BSP and have a minimal RTEMS console application (source
>> code included below). The rc.conf file configures the cgem0 interface and starts
>> FTP and telnet daemons.
>>
>> If I include the 'rtems_bsd_get_mac_address' function, the mac address is set
>> but RTEMS doesn't respond to any pings and doesn't allow any connections.
>> However, a ping to an external device from RTEMS is successful. I have run
>> tcpdump filtering on ICMP messages and RTEMS sees them.
>>
>> If I comment out the 'rtems_bsd_get_mac_address' function, it has the default
>> mac address and everything works as expected.
>>
>> All guidance and help are greatly appreciated.
> I have commented in the code fragments below.
>
>> Thanks,
>> Rick
>>
>>
>> //
>> // RTEMS_Main.c
>> //
>> #include <bsp.h>
>> #include <assert.h>
>> #include <stdlib.h>
>> #include <stdio.h>
>> #include <unistd.h>
>> #include <rtems/ramdisk.h>
>> #include <rtems/printer.h>
>> #include <rtems/stackchk.h>
>> #include <rtems/bsd/bsd.h>
>> #include <rtems/media.h>
>> #include <machine/rtems-bsd-rc-conf.h>
>> #include <rtems/ftpd.h>
>>
>> #include <rtems/console.h>
>> #include <rtems/shell.h>
>>
>> #include <stdint.h>
>>
>> void rtems_bsd_get_mac_address(const char* name, int unit, uint8_t mac_addr[6])
>> {
>> mac_addr[0] = 0x0f;
>> mac_addr[1] = 0xc0;
>> mac_addr[2] = 0xcb;
>> mac_addr[3] = 0x6f;
>> mac_addr[4] = 0xcb;
>> mac_addr[5] = 0x22;
>> }
> Interesting, I did not know this existed. I prefer following the same process
> FreeBSD provides and uses. See below.
>
>> static void start_console(void)
>> {
>> rtems_status_code sc = rtems_shell_init(
>> "SHLL",
>> 32 * 1024,
>> 1,
>> CONSOLE_DEVICE_NAME,
>> true,
>> true,
>> NULL
>> );
>> assert(sc == RTEMS_SUCCESSFUL);
>> }
>>
>> static void network_init(void)
>> {
>> printf("BSD\n");
>> rtems_status_code sc = rtems_bsd_initialize();
>> assert(sc == RTEMS_SUCCESSFUL);
>>
>> sc = rtems_task_wake_after( 1000 );
>> assert(sc == RTEMS_SUCCESSFUL);
>>
>> printf("Config\n");
>> // configure bsd networking by specifying configuration file, wait forever,
>> verbose = true
>> rtems_bsd_run_rc_conf("/media/mmcsd-0-0/rc.conf", 0, true);
> I suggest specifying the MAC address for the interface in rc.conf. For a Zync I
> have something like:
>
> ifconfig_cgem0="DHCP rxcsum txcsum"
> ifconfig_cgem0_alias0="ether 0f:c0:cb:6f:cb:22"
>
> I generate the rc.conf file writing it to /etc/rc.conf. This lets me read a MAC
> address from what ever piece of hardware has been placed on the board.
>
> Chris
>
>> }
>>
>> void *main_thread(void *arg)
>> {
>> printf("Media Server\n");
>> rtems_media_server_initialize(
>> 25,
>> 32 * 1024,
>> RTEMS_PREEMPT | RTEMS_NO_TIMESLICE | RTEMS_ASR | RTEMS_INTERRUPT_LEVEL(0),
>> RTEMS_NO_FLOATING_POINT | RTEMS_LOCAL );
>>
>> rtems_status_code sc = rtems_task_wake_after( 1000 );
>> assert(sc == RTEMS_SUCCESSFUL);
>>
>> network_init();
>>
>> sc = rtems_task_wake_after( 1000 );
>> assert(sc == RTEMS_SUCCESSFUL);
>>
>> start_console();
>>
>> assert(0);
>> }
>>
>> /*
>> * Configure LibBSD.
>> */
>> #define RTEMS_BSD_CONFIG_NET_PF_UNIX
>> #define RTEMS_BSD_CONFIG_NET_IF_BRIDGE
>> #define RTEMS_BSD_CONFIG_NET_IF_LAGG
>> #define RTEMS_BSD_CONFIG_NET_IF_VLAN
>> #define LIBBSP_ARM_XILINX_ZYNQ_BSP_H
>> #define RTEMS_BSD_CONFIG_BSP_CONFIG
>> #define RTEMS_BSD_CONFIG_SERVICE_TELNETD
>> #define RTEMS_BSD_CONFIG_SERVICE_FTPD
>> #define RTEMS_BSD_CONFIG_INIT
>>
>> #include <machine/rtems-bsd-config.h>
>>
>> /*
>> * Configure Shell
>> */
>> #define CONFIGURE_SHELL_COMMANDS_INIT
>>
>> #include <bsp/irq-info.h>
>>
>> #include <rtems/netcmds-config.h>
>>
>> #ifdef RTEMS_BSD_MODULE_USER_SPACE_WLANSTATS
>> #define SHELL_WLANSTATS_COMMAND &rtems_shell_WLANSTATS_Command,
>> #else
>> #define SHELL_WLANSTATS_COMMAND
>> #endif
>>
>> #ifdef RTEMS_BSD_MODULE_USR_SBIN_WPA_SUPPLICANT
>> #define SHELL_WPA_SUPPLICANT_COMMAND &rtems_shell_WPA_SUPPLICANT_Command,
>> #else
>> #define SHELL_WPA_SUPPLICANT_COMMAND
>> #endif
>>
>> #define CONFIGURE_SHELL_USER_COMMANDS \
>> SHELL_WLANSTATS_COMMAND \
>> SHELL_WPA_SUPPLICANT_COMMAND \
>> &bsp_interrupt_shell_command, \
>> &rtems_shell_ARP_Command, \
>> &rtems_shell_HOSTNAME_Command, \
>> &rtems_shell_PING_Command, \
>> &rtems_shell_ROUTE_Command, \
>> &rtems_shell_NETSTAT_Command, \
>> &rtems_shell_IFCONFIG_Command, \
>> &rtems_shell_TCPDUMP_Command, \
>> &rtems_shell_SYSCTL_Command, \
>> &rtems_shell_VMSTAT_Command
>>
>> #define CONFIGURE_SHELL_COMMANDS_ALL
>>
>> #include <rtems/shellconfig.h>
>>
>> /*
>> * Configure RTEMS.
>> */
>> #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
>> #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
>>
>> #define CONFIGURE_APPLICATION_NEEDS_LIBBLOCK
>>
>> #define CONFIGURE_FILESYSTEM_DEVFS
>> #define CONFIGURE_FILESYSTEM_DOSFS
>> #define CONFIGURE_MAXIMUM_FILE_DESCRIPTORS 32
>>
>> #define CONFIGURE_MAXIMUM_USER_EXTENSIONS 1
>>
>> #define CONFIGURE_UNLIMITED_ALLOCATION_SIZE 32
>> #define CONFIGURE_UNLIMITED_OBJECTS
>> #define CONFIGURE_UNIFIED_WORK_AREAS
>>
>> #define CONFIGURE_STACK_CHECKER_ENABLED
>>
>> #define CONFIGURE_BDBUF_BUFFER_MAX_SIZE (64 * 1024)
>> #define CONFIGURE_BDBUF_MAX_READ_AHEAD_BLOCKS 4
>> #define CONFIGURE_BDBUF_CACHE_MEMORY_SIZE (1 * 1024 * 1024)
>>
>> #define CONFIGURE_MAXIMUM_POSIX_THREADS 20
>> #define CONFIGURE_POSIX_INIT_THREAD_TABLE
>> #define CONFIGURE_POSIX_INIT_THREAD_ENTRY_POINT main_thread
>>
>> #define CONFIGURE_MAXIMUM_PROCESSORS 2
>> #define CONFIGURE_MICROSECONDS_PER_TICK 1000
>> #define CONFIGURE_TICKS_PER_TIMESLICE 50
>>
>> #define CONFIGURE_SCHEDULER_PRIORITY_SMP
>>
>> #define CONFIGURE_INIT
>>
>> #include <rtems/confdefs.h>
>>
>>
>>
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