mcp251x Error during multiple ip link ups/downs

Open

#5,976 opened on Feb 21, 2024 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 32/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: c, linux, raspberry-pi, shell
Domain: embedded-iot, networking, operating-systems

Research direction

Start by reproducing the failure with the supplied Bash loop and review the mcp251x driver paths involved in repeated interface down/up and bitrate changes. Use the kernel messages about failure to enter config mode and inconsistent configuration to trace the transition; done means repeated changes no longer produce RTNETLINK timeouts or hang the Raspberry Pi.

Written by the indexing model from the issue text.

Description

Describe the bug

Hello,

I work with the CAN bus (simple write and reads works fine) I wanted to prepare automatic detection of the baud rate. The problem occurs when we changing interface settings in a loop. After a few tries, "RTNETLINK Replies: Connection Timeout" appears and the Raspberry Pi hangs.

I founded similar problem at fork but for mcp25xxfd driver https://github.com/msperl/linux-rpi/issues/12

Steps to reproduce the behaviour

Connect to a CAN bus device that sends data and run script at Raspberry Pi. I added sleeps to check if this could help

#!/bin/bash
array=(10000 20000 50000 100000 125000 250000 500000 800000 1000000)
can=$1
while true
do
    for i in "${array[@]}"
    do
        echo $i
        sleep 1
        sudo ip link set $can down
        sleep 1
        sudo ip link set $can up type can bitrate $i
        sleep 1
        candump $can -T 100
    done
done

Device (s)

Raspberry Pi CM4 Lite

System

Raspberry Pi reference 2023-10-10
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 962bf483c8f326405794827cce8c0313fd5880a8, stage2

Aug 10 2023 15:33:38
Copyright (c) 2012 Broadcom
version 03dc77429335caee083e22ddc8eec09c07f12a7a (clean) (release) (start)

Linux raspberrypi 6.1.0-rpi4-rpi-v8 #1 SMP PREEMPT Debian 1:6.1.54-1+rpt2 (2023-10-05) aarch64 GNU/Linux

Logs

Feb 21 14:40:10 raspberrypi kernel: mcp251x spi0.0: MCP251x didn't enter in config mode
Feb 21 14:40:10 raspberrypi kernel: A link change request failed with some changes committed already. Interface can1 may have been left with an inconsistent configuration, please check.

Additional context

No response

Dominant language: C
Stars: 13.2k
Forks: 5.5k
Avg merge: 2d 21h
Merged PRs (30d): 21

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