openbmc_support

Mini-design for OpenBMC support

Background

To support OpenBMC management. Interface is openbmc.

Node definition

mgt=openbmc

OpenBMC table

When send request bmc ip, username, password are needed. Create a new table ‘openbmc’, “#node,bmc,username,password,comments,disable”.

Plugin file

/opt/xcat/lib/perl/xCAT_plugin/openbmc.pm /opt/xcat/lib/perl/xCAT/OPENBMC.pm

The implementation details(take rpower on as example)

Hash variable

%node_info = (
    $node => {
        bmc        => "x.x.x.x",
        username   => "username",
        password   => "password",
        cur_url    => “”,   
        method     => “”,      
        back_urls  => (),   
        cur_status => "LOGIN_REQUEST",
    },
);

%status_info = {
    LOGIN_REQUEST => {
        method => "POST",
        init_url   => "/login",
    },
    LOGIN_RESPONSE => {
        process => \&login_response,
    },
    RPOWER_ON_REQUEST => {
        method => "POST",
        init_url   => "/power/on”,
    },
    RPOWER_ON_RESPONSE => {
        process => \&rpower_response,
    },
};

%next_status = {
    LOGIN_REQUEST => ”LOGIN_RESPONSE",
    LOGIN_RESPONSE => "RPOWER_ON_REQUEST", 
    RPOWER_ON_REQUEST => “RPOWER_ON_RESPONSE”,
};

The main code logic

Parse argument

• Check errors.
• Get parameters and fill into %node_info hash, set cur_status as LOGIN_REQUEST
• Get subcommands fill into %next_status array.

Login

• OPENBMC （xCAT::OPENBMC->new）

  • Generate request use HTTP::Request
  • Create cookies use HTTP::Cookies
  • Send request use add_with_opts (HTTP::Async)
  • Return handle ID

• openbmc

  • Start Async
  • Start while loop
  • Get handle ID and cookies use xCAT::OPENBMC->new
  • Change cur_status to LOGIN_RESPONSE

• The code logic for main loop:

    generate and send login request of each node
    while (1)
        if (the node array that stores nodes which hadn’t been dealt with is empty) and (pending response counter equal 0)   # It means all nodes have been dealt, and no more response is expected, the loop will end 
            break;
   	    endif
  
        while (wait_for_next_response)
            deal_with_response
        end while (wait_for_next_response)
    end while (1)
  

Wait for response

• Get response in while loop
• Compare ID to get node name
• Deal with response. If status is ‘OK’, go to next step, cur_status = RPOWER_ON_REQUEST. Or, return with error message.

Send subcommand request

• Check cur_status
• Get cur_url and pop first sub_url, generate url to send. If there is no cur_url, use url in %status_info.
• Send request use xCAT::OPENBMC->send_request
• Change cur_status to xxxx_RESPONSE
• Wait for response

Deal with response

• Check if there is info want to get
• If get, go next step. If not, check @sub_url whether empty.
• If empty, return error. If not, set cur_status as xxx_REQUEST. Send request.