Bond 8023ad lacp handshake sometimes fail

https://bugs.dpdk.org/show_bug.cgi?id=483

            Bug ID: 483
           Summary: Bond 8023ad lacp handshake sometimes fail
           Product: DPDK
           Version: 19.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

There are two ports in my bond and two hosts are connected by a switch. I open the dpdk debug info with macro RTE_LIBRTE_BOND_DEBUG_8023AD.

Port 0 MAC: ac:f9:70:88:f3:26
Port 1 MAC: ac:f9:70:88:f3:27
BOND MAC: ac:f9:70:88:f3:26

When tx_machine send lacp with Port 1 Mac ac:f9:70:88:f3:27, the handshake will fail.

when lacp handshake failed, log like this:

----------

997 [Port 0: rx_machine] -> INITIALIZE
997 [Port 0: periodic_machine] -> NO_PERIODIC ( begind LACP active ) 997 [Port 0: mux_machine] -> DETACHED
997 [Port 0: selection_logic] -> SELECTED: ID= 1
aggregator found aggregator ID= 1
997 [Port 0: mux_machine] DETACHED -> WAITING

1995 [Port 1: tx_machine] Sending LACP frame
bond_print_lacp(122) - LACP: {
subtype= 01
ver_num=01
actor={ tlv=01, len=14

    pri=FFFF, system=AC:F9:70:88:F3:27, key=2100, p_pri=FF00 p_num=0200
       state={ ACT AGG DEF EXP }
  }
  partner={ tlv=02, len=14
    pri=FFFF, system=00:00:00:00:00:00, key=0100, p_pri=FF00 p_num=0000
       state={ ACT TIMEOUT AGG }

}
collector={info=03, length=10, max_delay=0000
, type_term=00, terminator_length = 00 }
1995 [Port 0: tx_machine] Sending LACP frame
bond_print_lacp(122) - LACP: {
subtype= 01
ver_num=01
actor={ tlv=01, len=14

    pri=FFFF, system=AC:F9:70:88:F3:27, key=2100, p_pri=FF00 p_num=0100
       state={ ACT AGG DEF EXP }
  }
  partner={ tlv=02, len=14
    pri=FFFF, system=00:00:00:00:00:00, key=0100, p_pri=FF00 p_num=0000
       state={ ACT TIMEOUT AGG }

}
collector={info=03, length=10, max_delay=0000
, type_term=00, terminator_length = 00 }
2095 [Port 1: mux_machine] ATTACHED Entered
2594 [Port 1: tx_machine] Sending LACP frame
----------

when lacp handshake succeeds, log like this:
----------

     0 [Port 0: rx_machine] -> INITIALIZE
     0 [Port 0: periodic_machine] -> NO_PERIODIC ( begind LACP active )
     0 [Port 0: mux_machine] -> DETACHED
    99 [Port 0: mux_machine] DETACHED -> WAITING

Waiting for slaves to become active...
Port 2 MAC: ac:f9:70:88:f3:26
236 [Port 1: rx_machine] -> INITIALIZE
236 [Port 1: periodic_machine] -> NO_PERIODIC ( begind LACP active ) 236 [Port 1: mux_machine] -> DETACHED
236 [Port 1: selection_logic] -> SELECTED: ID= 0
aggregator found aggregator ID= 0
236 [Port 1: mux_machine] DETACHED -> WAITING
1034 [Port 0: tx_machine] Sending LACP frame

1034 [Port 0: tx_machine] Sending LACP frame
bond_print_lacp(122) - LACP: {
subtype= 01
ver_num=01
actor={ tlv=01, len=14

    pri=FFFF, system=AC:F9:70:88:F3:26, key=2100, p_pri=FF00 p_num=0100
       state={ ACT AGG DEF EXP }
  }
  partner={ tlv=02, len=14
    pri=FFFF, system=00:00:00:00:00:00, key=0100, p_pri=FF00 p_num=0000
       state={ ACT TIMEOUT AGG }

}
collector={info=03, length=10, max_delay=0000
, type_term=00, terminator_length = 00 }
1234 [Port 1: tx_machine] Sending LACP frame
bond_print_lacp(122) - LACP: {
subtype= 01
ver_num=01
actor={ tlv=01, len=14

    pri=FFFF, system=AC:F9:70:88:F3:26, key=2100, p_pri=FF00 p_num=0200
       state={ ACT AGG DEF EXP }
  }
  partner={ tlv=02, len=14
    pri=FFFF, system=00:00:00:00:00:00, key=0100, p_pri=FF00 p_num=0000
       state={ ACT TIMEOUT AGG }

}
collector={info=03, length=10, max_delay=0000
, type_term=00, terminator_length = 00 }
2032 [Port 0: tx_machine] Sending LACP frame

2332 [Port 1: rx_machine] LACP -> CURRENT
bond_print_lacp(122) - LACP: {
subtype= 01
ver_num=01
actor={ tlv=01, len=14

    pri=0080, system=F8:98:EF:69:83:91, key=417F, p_pri=0080 p_num=0600
       state={ ACT TIMEOUT AGG }
  }
  partner={ tlv=02, len=14
    pri=FFFF, system=AC:F9:70:88:F3:26, key=2100, p_pri=FF00 p_num=0200
       state={ ACT AGG DEF EXP }

}
collector={info=03, length=10, max_delay=0000
, type_term=00, terminator_length = 00 }
2332 [Port 1: mux_machine] ATTACHED Entered

----------

Through my observation: when log print "SELECTED: ID= 1", it uses the wrong mac address to send lacp.

selection_logic function choose wrong aggregator_port_id here.

rte_eth_bond_8023ad.c:749

        case AGG_STABLE:
                if (default_slave == slaves_count)
                        new_agg_id = slaves[slave_id];
                else
                        new_agg_id = slaves[default_slave]; // sometimes

new_agg_id will be 1

why does the lacp handshake succeed sometimes?

The "slaves" array is filled with unsure order by function "activate_slave". When port 0 fill the slave[0], It works correctly.

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