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FS#3073 - AR8337/AR8327 Flow Control Enabled on Archer C7 v5 (and probably others) #7840

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openwrt-bot opened this issue May 8, 2020 · 1 comment
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@openwrt-bot openwrt-bot commented May 8, 2020

rkeene:

I have a TP-Link Archer C7 v5 (ath79/generic) running OpenWrt 19.07.2 r10947-65030d81f3 and periodically one of my hosts sends out a long-running flood (10/sec) of MPCP Pause frames. The AR8337 switch is configured to honor these frames on port 0 (CPU), and other ports, so stops switching frames essentially forever.

There is no way exposed to user to disable flow control.

Flow control should be turned off unless explicitly requested by the user (e.g., they are in a Datacenter/Enterprise environment and/or doing Fibre Channel over Ethernet). This is exactly the opposite of how it currently is with the added benefit that the user cannot change the behavior.

Here's a tool that will helpfully generate MPCP Pause frames:
https://github.com/nwholloway/mpcp

You can use this to bring down your network indefinitely. Additionally, since the AR8337 switch consumes these frames you will not be able to see them from the OpenWRT host.

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@openwrt-bot openwrt-bot commented Sep 29, 2021

Ansuel:

The problem will be autofixed when we will switch to qca8k driver where you can configure flow control.

@aparcar aparcar added the kernel label Feb 22, 2022
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