The CMIS protocol type optical module fails to obtain the single-lane rate accurately.

[KroosMicas]

Problem

The rate obtained by using the get_lane_speed_key interface for CMIS type optical modules is not the rate of a single lane.

Symptoms

When using CMIS type optical modules, it was found that the single lanes speed obtained through get_lane_speed_key was inaccurate. After adding debugging information, the log obtained is as follows:

`{'vendor_key': 'LUXSHARE-ICT -LPZDD002-SD-R ', 'media_key': 'QSFP-DD-passive_copper_media_interface-1.0M', 'lane_speed_key': 'speed:400G'}

{'vendor_key': 'BIZLINK -C45593-A557-D10 ', 'media_key': 'QSFP-DD-passive_copper_media_interface-1.0M', 'lane_speed_key': 'speed:400G'}`

Root Cause

if xcvrd.is_cmis_api(api):

    appl_adv_dict = api.get_application_advertisement()

    app_id = xcvrd.get_cmis_application_desired(api, lane_count, port_speed)

    if app_id and app_id in appl_adv_dict:

        host_electrical_interface_id = appl_adv_dict[app_id].get('host_electrical_interface_id')

        if host_electrical_interface_id:

            lane_speed_key = LANE_SPEED_KEY_PREFIX + host_electrical_interface_id.split()[0]`

The rate obtained by the above code is not for a single lane, and no exception handling has been implemented.

Proposed Solution

Add exception handling and calculation of the rate for each individual lane.
`
if xcvrd.is_cmis_api(api):

    appl_adv_dict = api.get_application_advertisement()

    app_id = xcvrd.get_cmis_application_desired(api, lane_count, port_speed)

    if app_id and app_id in appl_adv_dict:

        host_electrical_interface_id = appl_adv_dict[app_id].get('host_electrical_interface_id')

        if host_electrical_interface_id:

            lane_speed_key = LANE_SPEED_KEY_PREFIX + host_electrical_interface_id.split()[0]

        if lane_speed_key is None or str(port_speed//1000) in lane_speed_key:

            lane_speed_key = '{}{}G'.format(LANE_SPEED_KEY_PREFIX, port_speed // lane_count // 1000)`

[micas-net]

This issue fixes by #598