Re: [PATCH v2] ath10k: implement set_base_macaddr to fix rx-bssid mask in multiple APs conf

From: Brian Norris <briannorris@chromium.org>
To: Christian Lamparter <chunkeey@gmail.com>
Cc: Ben Greear <greearb@candelatech.com>,
	linux-wireless@vger.kernel.org, Mathias Kresin <dev@kresin.me>,
	ath10k@lists.infradead.org, Felix Fietkau <nbd@nbd.name>
Subject: Re: [PATCH v2] ath10k: implement set_base_macaddr to fix rx-bssid mask in multiple APs conf
Date: Mon, 4 Feb 2019 13:29:36 -0800	[thread overview]
Message-ID: <20190204212935.GA158434@google.com> (raw)
In-Reply-To: <20190204205714.23858-1-chunkeey@gmail.com>

Hi,

On Mon, Feb 04, 2019 at 09:57:14PM +0100, Christian Lamparter wrote:
> Many integrated QCA9984 WiFis in various IPQ806x platform routers
> from various vendors (Netgear R7800, ZyXEL NBG6817, TP-LINK C2600,
> etc.) have either blank, bogus or non-unique MAC-addresses in
> their calibration data.
> 
> As a result, OpenWrt utilizes a discouraged binary calibration data
> patching method that allows to modify the device's MAC-addresses right
> at the source. This is because the ath10k' firmware extracts the MAC
> address from the supplied radio/calibration data and issues a response
> to the ath10k linux driver. Which was designed to take the main MAC in
> ath10k_wmi_event_ready().
> 
> Part of the "setting an alternate MAC" issue was already tackled by a
> patch from Brian Norris:
> commit 9d5804662ce1
> ("ath10k: retrieve MAC address from system firmware if provided")
> by allowing the option to specify an alternate MAC-address with the
> established device_get_mac_address() function which extracts the right
> address from DeviceTree/fwnode mac-address or local-mac-address
> properties and saves it for later.
> 
> However, Ben Greear noted that the Qualcomm's ath10k firmware is liable
> to not properly calculate its rx-bssid mask in this case. This can cause
> issues in the popluar "multiple AP with a single ath10k instance"
> configurations.
> 
> To improve MAC address handling, Felix Fietkau suggested to call
> pdev_set_base_macaddr_cmdid before bringing up the first vif and
> use the first vif MAC address there. Which is in ath10k_core_start().
> 
> This patch implement Felix Fietkau's request to
> "call pdev_set_base_macaddr_cmdid before bringing up the first vif".
> The pdev_set_base_macaddr_cmdid is already declared for all devices
> and version. The driver just needed the support code for this
> function.
> 
> Tested on:
> QCA9880/CUS223, firmwares: 10.2.4.13-2, 10.2.4.70.44, 10.2.4-1.0-00041
> QCA9887/MR33 firmware:10.2.4-1.0-00033
> QCA4019/RT-AC58U firmware: 10.4-3.4-00104, 10.4-3.5.3-00057
> QCA9984/R7800 firmware: Candela Technologies (CT) Firmware
> 
> BugLink: https://lists.openwrt.org/pipermail/openwrt-devel/2018-November/014595.html
> Fixes: 9d5804662ce1 ("ath10k: retrieve MAC address from system firmware if provided")
> Cc: Brian Norris <briannorris@chromium.org>
> Cc: Ben Greear <greearb@candelatech.com>
> Cc: Felix Fietkau <nbd@nbd.name>
> Cc: Mathias Kresin <dev@kresin.me>
> Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
> 
> ---
> 
> Changed from v1:
> 	- removed support for obsolete, untested firmwares
> 	- removed unsupported TLV ops
> 	- don't error-out on unsupported platforms

This doesn't break WCN3990 this time (which doesn't support this
command), and I correctly hit the EOPNOTSUPP path:

Tested-by: Brian Norris <briannorris@chromium.org>

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