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From:   Tom Psyborg <pozega.tomislav@gmail.com>
Date:   Wed, 13 Mar 2019 14:02:32 +0100
Message-ID: <CAKR_QV+sFc6J97f5dtW9OtxGoEj5udB=fY5qAb3_QgF4jfqEVA@mail.gmail.com>
Subject: Re: [PATCH 2/2] rt2x00: enable experimental MFP with HW crypt
To:     Stanislaw Gruszka <sgruszka@redhat.com>
Cc:     linux-wireless@vger.kernel.org, kvalo@codeaurora.org,
        daniel@makrotopia.org
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On 13/03/2019, Stanislaw Gruszka <sgruszka@redhat.com> wrote:
> On Tue, Mar 12, 2019 at 08:11:42PM +0100, Tomislav Po=C5=BEega wrote:
>> MFP can work with enabled HW crypt engine, but in this case
>> available bandwidth is reduced at least when connecting to
>> Archer C7 (QCA9558). Enable the feature for known to work chipsets-
>> MT7620, RT3070 and RT5390. Userspace setting for ieee80211w should
>> default to 0 in order to prevent unintentional bandwidth drop.
>>
>> Signed-off-by: Tomislav Po?ega <pozega.tomislav@gmail.com>
>> ---
>>  drivers/net/wireless/ralink/rt2x00/rt2800lib.c |   11 +++++++----
>>  1 files changed, 7 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
>> b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
>> index a03b528..bb8204d 100644
>> --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
>> +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
>> @@ -9326,6 +9326,13 @@ static int rt2800_probe_hw_mode(struct rt2x00_dev
>> *rt2x00dev)
>>  	ieee80211_hw_set(rt2x00dev->hw, SIGNAL_DBM);
>>  	ieee80211_hw_set(rt2x00dev->hw, SUPPORTS_PS);
>>
>> +	/* Experimental: Set MFP with HW crypto enabled. */
>> +	if (rt2x00_rt(rt2x00dev, RT3070) || rt2x00_rt(rt2x00dev, RT5390) ||
>> +	    rt2x00_rt(rt2x00dev, RT6352))
>> +		ieee80211_hw_set(rt2x00dev->hw, MFP_CAPABLE);
>
> Is not that we support MFP in hardware. We just return -EOPNOTSUPP
> in rt2x00mac_set_key() when mac80211 will try to set MFP ciphers
> (since rt2x00crypto_key_to_cipher() will return CIPHER_NONE) and
> we fallback to software encryption.
>
> Please repost patch that enable MFP unconditionally with
> 'Cc: stable@vger.kernel.org' tag.
>
> Stanislaw
>

No, I have not test any other chipsets besides the ones I enabled it
for. It is possible this would cause problems on other devices, so
just enable it for the known to work ones.