gistfile1.txt

# ibv_devinfo 
hca_id: mlx5_1
        transport:                      InfiniBand (0)
        fw_ver:                         16.21.2010
        node_guid:                      ec0d:9a03:008e:b989
        sys_image_guid:                 ec0d:9a03:008e:b988
        vendor_id:                      0x02c9
        vendor_part_id:                 4121
        hw_ver:                         0x0
        board_id:                       MT_0000000013
        phys_port_cnt:                  1
        Device ports:
                port:   1
                        state:                  PORT_ACTIVE (4)
                        max_mtu:                4096 (5)
                        active_mtu:             1024 (3)
                        sm_lid:                 0
                        port_lid:               0
                        port_lmc:               0x00
                        link_layer:             Ethernet

hca_id: mlx5_0
        transport:                      InfiniBand (0)
        fw_ver:                         16.21.2010
        node_guid:                      ec0d:9a03:008e:b988
        sys_image_guid:                 ec0d:9a03:008e:b988
        vendor_id:                      0x02c9
        vendor_part_id:                 4121
        hw_ver:                         0x0
        board_id:                       MT_0000000013
        phys_port_cnt:                  1
        Device ports:
                port:   1
                        state:                  PORT_ACTIVE (4)
                        max_mtu:                4096 (5)
                        active_mtu:             1024 (3)
                        sm_lid:                 0
                        port_lid:               0
                        port_lmc:               0x00
                        link_layer:             Ethernet

gistfile2.txt

fi_getinfo(FI_VERSION(1, 1), this->ep.address().c_str(), port_addr, FI_SOURCE, hints, &this->fi)
fi_fabric(this->fi->fabric_attr, &this->fabric, NULL)))
fi_eq_open(this->fabric, &eq_attr, &this->eq, NULL)
fi_passive_ep(this->fabric, this->fi, &this->pep, NULL)
fi_pep_bind(this->pep, &this->eq->fid, 0)
fi_control(&this->eq->fid, FI_GETWAIT, &this->ev_context.fd)

// register file descriptor in epoll, wait for notification

fi_eq_sread(eq, &event, &entry, sizeof entry, 0, 0);

// fi_eq_sread yields
//     FI_CONNREQ when the request comes on one port. All is good, establish connection
//     FI_EAGAIN when the request comes on the other port