linux-kernel - Re: [RFC PATCH v3] rtl8xxxu: Improve TX performance of RTL8723BU on rtl8xxxu driver

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Message-ID: <CAD8Lp465rwNHt0TSmCKfFzpSagbZBd2iBHx5JrLo7Qp8YvTSgw@mail.gmail.com>
Date:   Thu, 30 May 2019 10:18:49 -0600
From:   Daniel Drake <drake@...lessm.com>
To:     Chris Chiu <chiu@...lessm.com>
Cc:     Jes Sorensen <jes.sorensen@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        David Miller <davem@...emloft.net>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [RFC PATCH v3] rtl8xxxu: Improve TX performance of RTL8723BU on
 rtl8xxxu driver

On Wed, May 29, 2019 at 10:52 PM Chris Chiu <chiu@...lessm.com> wrote:
> You mean moving the ratr_index to be the 4th function parameter of
> update_rate_mask which has 2 candidates rtl8xxxu_update_rate_mask
> and rtl8xxxu_gen2_update_rate_mask? I was planning to keep the
> rtl8xxxu_update_rate_mask the same because old chips seems don't
> need the rate index when invoking H2C command to change rate mask.
> And rate index is not a common phrase/term for rate adaptive. Theoretically
> we just need packet error rate, sgi and other factors to determine the rate
> mask. This rate index seems to be only specific to newer Realtek drivers
> or firmware for rate adaptive algorithm.  I'd like to keep this for gen2 but
> I admit it's ugly to put it in the priv structure. Any suggestion is
> appreciated.

I think it's cleaner to have it as a function parameter, even if the
old chips don't use it.
The rest of the implementation is in the core, so we aren't exactly
dealing with chip-specific code here, at least the way it's currently
done.
The vendor driver also has it as a function parameter from what I can see.

Daniel