netdev - Re: [PATCH v4 0/4] wifi: libertas: IE handling fixes

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Date:   Tue, 24 Jan 2023 12:24:56 -0600
From:   Dan Williams <dcbw@...hat.com>
To:     Doug Brown <doug@...morgal.com>, Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Simon Horman <simon.horman@...igine.com>,
        libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v4 0/4] wifi: libertas: IE handling fixes

On Sun, 2023-01-22 at 21:31 -0800, Doug Brown wrote:
> This series implements two fixes for the libertas driver that restore
> compatibility with modern wpa_supplicant versions, and adds (or at
> least
> improves) support for WPS in the process.
> 
> 1) Better handling of the RSN/WPA IE in association requests:
>    The previous logic was always just grabbing the first one, and
> didn't
>    handle multiple IEs properly, which wpa_supplicant adds nowadays.
> 
> 2) Support for IEs in scan requests:
>    Modern wpa_supplicant always adds an "extended capabilities" IE,
>    which violates max_scan_ie_len in this driver. Go ahead and allow
>    scan IEs, and handle WPS based on the info that Dan provided.
> 
> These changes have been tested on a Marvell PXA168-based device with
> a
> Marvell 88W8686 Wi-Fi chipset. I've confirmed that with these changes
> applied, modern wpa_supplicant versions connect properly and WPS also
> works correctly (tested with "wpa_cli -i wlan0 wps_pbc any").

Tested with a usb8388 (fw 9.34.3p23), x86, wpa_supplicant 2.10.
Scanning and connecting to a WPA2 AP works. Doesn't panic when I pull
the dongle out. Ship it!

Reviewed-by: Dan Williams <dcbw@...hat.com>
Tested-by: Dan Williams <dcbw@...hat.com>

Dan

> 
> Changes since V3:
> - Do more extensive code style fixes suggested by Ping-Ke Shih
> 
> Changes since V2:
> - Add missing cpu_to_le16 as suggested by Simon Horman
> 
> Changes since V1 (which was a single patch linked here [1]):
> 
> - Switch to cfg80211_find_*_elem when looking for specific IEs,
>   resulting in cleaner/safer code.
> - Use mrvl_ie_data struct for cleaner manipulation of TLV buffer, and
>   fix capitalization of the "data" member to avoid checkpatch
> warnings.
> - Implement idea suggested by Dan to change max_scan_ie_len to be
>   nonzero and enable WPS support in probe requests while we're at it.
> - Remove "Fixes:" tag; I'm not sure if it's still appropriate or not
>   with it depending on the capitalization fix.
> - Clarify comments.
> 
> [1]
> https://lore.kernel.org/all/20230102234714.169831-1-doug@schmorgal.com/
> 
> Doug Brown (4):
>   wifi: libertas: fix code style in Marvell structs
>   wifi: libertas: only add RSN/WPA IE in lbs_add_wpa_tlv
>   wifi: libertas: add new TLV type for WPS enrollee IE
>   wifi: libertas: add support for WPS enrollee IE in probe requests
> 
>  drivers/net/wireless/marvell/libertas/cfg.c   | 76 +++++++++++++++--
> --
>  drivers/net/wireless/marvell/libertas/types.h | 21 ++---
>  2 files changed, 74 insertions(+), 23 deletions(-)
>