netdev - Re: [PATCH 08/10] net: wwan: core: implement TIOCINQ ioctl

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Message-ID: <CAMZdPi-24bQUKWQK7fnuOdD85dSqys9-twUggbrbZUAGvOnRKA@mail.gmail.com>
Date:   Tue, 8 Jun 2021 10:51:03 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     Sergey Ryazanov <ryazanov.s.a@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCH 08/10] net: wwan: core: implement TIOCINQ ioctl

On Tue, 8 Jun 2021 at 06:02, Sergey Ryazanov <ryazanov.s.a@...il.com> wrote:
>
> It is quite common for a userpace program to fetch the buffered amount
> of data in the rx queue to avoid the read block. Implement the TIOCINQ
> ioctl to make the migration to the WWAN port usage smooth.
>
> Despite the fact that the read call will return no more data than the
> size of a first skb in the queue, TIOCINQ returns the entire amount of
> buffered data (sum of all queued skbs). This is done to prevent the
> breaking of programs that optimize reading, avoiding it if the buffered
> amount of data is too small.
>
> Signed-off-by: Sergey Ryazanov <ryazanov.s.a@...il.com>

Reviewed-by: Loic Poulain <loic.poulain@...aro.org>