netdev - Re: [PATCH net-next v4 1/5] net: hdlc_fr: Simpify fr_rx by using "goto rx

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Date:   Fri, 30 Oct 2020 12:34:25 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Xie He <xie.he.0141@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Krzysztof Halasa <khc@...waw.pl>
Subject: Re: [PATCH net-next v4 1/5] net: hdlc_fr: Simpify fr_rx by using
 "goto rx_drop" to drop frames

On Thu, Oct 29, 2020 at 10:31 PM Xie He <xie.he.0141@...il.com> wrote:
>
> 1.
> When the fr_rx function drops a received frame (because the protocol type
> is not supported, or because the PVC virtual device that corresponds to
> the DLCI number and the protocol type doesn't exist), the function frees
> the skb and returns.
>
> The code for freeing the skb and returning is repeated several times, this
> patch uses "goto rx_drop" to replace them so that the code looks cleaner.
>
> 2.
> Add code to increase the stats.rx_dropped count whenever we drop a frame.
> Increase the stats.rx_dropped count both after "goto rx_drop" and after
> "goto rx_error" because I think we should increase this value whenever an
> skb is dropped.

In general we try to avoid changing counter behavior like that, as
existing users
may depend on current behavior, e.g., in dashboards or automated monitoring.

I don't know how realistic that is in this specific case, no strong
objections. Use
good judgment.