[FS#3745] Wireless 'isolate' option not working in brcmfmac driver

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Geoff Natin (GeoffN) 

Attached to Project - OpenWrt/LEDE Project
Summary - Wireless 'isolate' option not working in brcmfmac driver
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - **Device**: BCM4356 WiFi chip + brcmfmac
**OpenWRT Version**: 21.02 (commit 50f2f25d58 [4 days ago])

I experienced the problem using OpenWrt 21.02 on a device using the brcmfmac driver for the BCM4356 chip.

I've only been able to test this on an InvizBox 2 (not supported by OpenWRT) but I suspect it to also be a problem for other devices using brcmfmac.

**Steps to reproduce**:

On a device running OpenWRT 21.02 and with a WiFi chip using the brcmfmac driver:

Set wireless..isolate='1' on the WiFi interface that uses the brcmfmac driver.

Devices connected to the WiFi interface should be isolated from each other, but are not.

**Notes / Potential fixes**:

I was able to fix this issue by building with a specific patch for brcmfmac from the latest Cypress Linux WiFi Driver Release (FMAC)(https://community.cypress.com/t5/Wi-Fi-Bluetooth-for-Linux/Cypress-Linux-WiFi-Driver-Release-FMAC-2021-01-14/m-p/268899). The particular patch that fixed the issue can be found in the .zip file linked in the latest Cypress driver release. cypress-fmac-v5.4.18-2021_0114.zip > cypress-patch-v5.4.18-2021_0114.tar.gz > cypress-patch > 0004-brcmfmac-support-AP-isolation.patch.

The patch has not been accepted into linux-wireless yet. But there are details about it here: https://patchwork.kernel.org/project/linux-wireless/patch/20200901063237.15549-2-wright.feng@cypress.com/.


Let me know if you need any more information or there's anything I can do to help sort this out. Thanks.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3745

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