Miss frame when using canfdtest

[fxt-7]

Miss frame when using canfdtest

[marckleinebudde]

Hey @fxt-7,

first of all, but unrelated to this issue, you should be using a proper mainline kernel with the mainline driver (mcp251xfd) for your mcp2518fd CAN controller. You're using the mcp25xxfd, which is a old version.

I think canfdtest doesn't properly work in loopback mode, it's not a problem on your side. Better setup a proper CAN bus and start canfdtest -v can0 on one side and canfdtest -vg can0 on the other side. If you have 2 CAN controllers on the same system, you can also use can0 and can1.

[fxt-7]

Hi @marckleinebudde,

Thank you for your quick and professional answer! ! I will update the driver version to the latest.
So if I want to test the loopback function in one can device, I should use the other tools, just like cangen? Is there a tool similar to canfdtest for testing the loopback function?

Hope your answer~

[marckleinebudde]

Consider updating your kernel, not just the CAN driver.

I've just updates the canfdtest in the https://github.com/linux-can/can-utils repo. It should now work on CAN devices in loopback mode, use -xx to filter out other and locally generated CAN traffic.

In one terminal:

canfdtest -xx -v can0

In another:

canfdtest -xx -vg can0

[fxt-7]

Hi @marckleinebudde

I can't update this product's kernel version, I must work on this kernel for the other work, so shall I update the driver to mcp251xfd base on the 5.4.254 kernel ?

On the other hand,thanks for your upadtes! ! I had tried the latest canfdtest to test loopback function, but how to determine if there is a frame drop, judge by these dot “.” ? Or just like the before, the err logs like Databyte %x mismatch?
send

receive

Another question, after you updating，the usage like ./canfdtest -xx -vg - f 100 can0 is right ? Or just can't assign the frame counts which I want to send ?

Looking forward to your answer, thanks~