linux-kernel - Re: [PATCH] brcmfmac: implement more accurate skb tracking

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Message-ID: <CACna6rwnLb3sEPmdx6uhYMstVn04WbP2xzznsjnwgguEXn04=w@mail.gmail.com>
Date:   Mon, 26 Sep 2016 14:13:35 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Arend Van Spriel <arend.vanspriel@...adcom.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Franky Lin <frankyl@...adcom.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "open list:BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        Network Development <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH] brcmfmac: implement more accurate skb tracking

On 26 September 2016 at 13:46, Arend Van Spriel
<arend.vanspriel@...adcom.com> wrote:
> On 26-9-2016 12:23, Rafał Miłecki wrote:
>> From: Rafał Miłecki <rafal@...ecki.pl>
>>
>> We need to track 802.1x packets to know if there are any pending ones
>> for transmission. This is required for performing key update in the
>> firmware.
>
> The problem we are trying to solve is a pretty old one. The problem is
> that wpa_supplicant uses two separate code paths: EAPOL messaging
> through data path and key configuration though nl80211.

Can I find it described/reported somewhere?


>> Unfortunately our old tracking code wasn't very accurate. It was
>> treating skb as pending as soon as it was passed by the netif. Actual
>> handling packet to the firmware was happening later as brcmfmac
>> internally queues them and uses its own worker(s).
>
> That does not seem right. As soon as we get a 1x packet we need to wait
> with key configuration regardless whether it is still in the driver or
> handed over to firmware already.

OK, thanks.