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[sfputil] Firmware download/upgrade CLI support for QSFP-DD (#1947) #2349

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merged 6 commits into from
Jan 9, 2023
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[sfputil] Firmware download/upgrade CLI support for QSFP-DD (#1947) #2349

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3134557
[sfputil] Firmware download/upgrade CLI support for QSFP-DD (#1947)
CliveNi Sep 1, 2022
716fa37
Update unit tests for sfputil.
CliveNi Sep 7, 2022
8f91400
[sfputil] Firmware download/upgrade CLI support for QSFP-DD (#1947)
CliveNi Sep 20, 2022
b1e41e8
[sfputil] Firmware download/upgrade CLI support for QSFP-DD (#1947)
CliveNi Oct 3, 2022
88c9af4
Update unit tests for sfputil.
CliveNi Oct 3, 2022
1c9c0f4
[sfputil] Firmware download/upgrade CLI support for QSFP-DD (#1947)
CliveNi Jan 7, 2023
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52 changes: 52 additions & 0 deletions sfputil/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1112,6 +1112,51 @@ def run_firmware(port_name, mode):

return status

def is_fw_switch_done(port_name):
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I am not sure why this API is required because there is already a return status from run_firmware() to indicate a failure. An imageA could be running while the committed Image could be Image B. For eg.

  1. Image A is running and its is the committed image
  2. User updates Image B
  3. Runs the image B

Now the running image is B but the committed image is A

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"run_firmware" indicates the status which read before reset to target image. This status only means module received and done the judgement for "run_firmware" cmd, but not means module already jumped into target image.
"run_firmware" will maybe involved non-volatile memory operation in module according to module implementation, so that it will maybe spend several or tens of seconds. That will cause commit failed if sends "commit_firmware" once "run_firmware" done without "is_fw_switch_done".
imageCheckPurpose

"""
Make sure the run_firmware cmd is done
@port_name:
Returns 1 on success, and exit_code = -1 on failure
"""
status = 0
physical_port = logical_port_to_physical_port_index(port_name)
sfp = platform_chassis.get_sfp(physical_port)

try:
api = sfp.get_xcvr_api()
except NotImplementedError:
click.echo("This functionality is currently not implemented for this platform")
sys.exit(ERROR_NOT_IMPLEMENTED)

try:
MAX_WAIT = 600 # 60s timeout.
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can we read from the module what is advertised instead of hardcoding here?

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@CliveNi CliveNi Oct 3, 2022 •
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There is still no definition of max duration for CDB_run cmd until CMIS5.2.
CDB_Duration

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@CliveNi why 60 secs?

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For more compatible with different module, timeout time should be the worst case. 60s is calculated for different implementation.
Feasible implementation as below,

  1. Dual image(A and B) is supported, and fw only executable at specific image.
  2. Dual image(A and B) is supported, and fw executable at both image.
  3. Triple image(A, B and factory) is supported, and fw only executable at specific image.
  4. Triple image(A, B and factory) is supported, and fw executable at all image.
  5. Single image is supported.

Case 1 and 3 will spend the most time to switch image. It will need to copy one image to non-volatile buffer, then interchange two images with each other. That will need 3 cycles erasing and programming on non-volatile memory.

We can roughly assume all of fw component in module around 1MBytes. A common M0~M4 MCU needs around 40ms per page(2KBytes) for non-volatile erasing and programming, so that the calculation as below.
1MBytes / 2KBytes * 40ms * 3cycles = 61.44s

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Just curious, if a firmware size is >> 1MB (e.g. close to 2 MB), does that mean 60 sec wait time would not be enough?

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@CliveNi CliveNi Jan 7, 2023 •
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Exactly, 1MB is a roughly number, but I think the margin is enough for different DSP solutions now. Actually, it only uses around 500KB totally in our 400/800G implementation.

fw_info = api.get_module_fw_info()
cnt = 0
is_busy = 1 if (fw_info['status'] == False) and (fw_info['result'] is not None) else 0
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@qinchuanares qinchuanares Jan 7, 2023 •
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Could you show examples of fw_info 1) when a module is busy and 2) when a module shows faulty status?

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@CliveNi CliveNi Jan 7, 2023 •
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"fw_info" is returned by "get_module_fw_info()" which is in cmis.py of "sonic-platform-common". It will return 3 combination patterns of status and result as below.

  1. {['status']: False, ['result']: None} : Cdb features not supported by switch, or wrong chkcode got from module. Do NOT need to recheck in these cases.
  2. {['status']: False, ['result']: 0} : I2C NACK or other interface issue. Recheck module fw info until timeout in this case.
  3. {['status']: True, ['result']: (ImageA & B information)} : Valid information got from module, go ahead to handle the return value.

The unit test function "test_is_fw_switch_done" in sfputil_test.py will also test all these cases.

while is_busy and cnt < MAX_WAIT:
time.sleep(0.1)
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May not need to check this frequently. It also brings a lot of workload to the module. Checking every 1 or 2 seconds should be OK without causing too much time delay.

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@CliveNi CliveNi Jan 7, 2023 •
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Agree, already revised to check every 2 seconds.

fw_info = api.get_module_fw_info()
is_busy = 1 if (fw_info['status'] == False) and (fw_info['result'] is not None) else 0
cnt += 1

if fw_info['status'] == True:
(ImageA, ImageARunning, ImageACommitted, ImageAValid,
ImageB, ImageBRunning, ImageBCommitted, ImageBValid) = fw_info['result']

if (ImageARunning == 1) and (ImageACommitted == 0): # ImageA is running, but not committed.
status = 1 # run_firmware is done.
elif (ImageBRunning == 1) and (ImageBCommitted == 0): # ImageB is running, but not committed.
status = 1 # run_firmware is done.
else: # No image is running, or running and committed image is same.
status = -1 # Failure for Switching images.
else:
status = -1 # Timeout or check code error or CDB not supported.

except NotImplementedError:
click.echo("This functionality is not applicable for this transceiver")

return status

def commit_firmware(port_name):
status = 0
physical_port = logical_port_to_physical_port_index(port_name)
Expand Down Expand Up @@ -1280,6 +1325,13 @@ def upgrade(port_name, filepath):

click.echo("Firmware run in mode 1 successful")

status = is_fw_switch_done(port_name)
if status != 1:
click.echo('Failed to switch firmware images!')
sys.exit(EXIT_FAIL)

click.echo("Firmware images switch successful")

status = commit_firmware(port_name)
if status != 1:
click.echo('Failed to commit firmware! CDB status: {}'.format(status))
Expand Down