linux-kernel - Re: [PATCH] net: sparx5: Fix return type of sparx5_port_xmit

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Date:   Tue, 20 Sep 2022 07:29:48 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Casper Andersson <casper.casan@...il.com>
Cc:     Nathan Huckleberry <nhuck@...gle.com>,
        Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sparx5: Fix return type of sparx5_port_xmit_impl

On Tue, 13 Sep 2022 10:15:48 +0200 Casper Andersson wrote:
> I noticed that the functions that assign the return value inside
> sparx5_port_xmit_impl also have return type int, which would ideally
> also be changed. But a bigger issue might be that
> sparx5_ptp_txtstamp_request and sparx5_inject (called inside
> sparx5_port_xmit_impl) returns -EBUSY (-16),

Yes, that seems off. IIUC error codes are treated as drops, 
but the driver doesn't free the frame. So it's likely a leak.

> when they should return NETDEV_TX_BUSY (16). If this is an issue then
> it also needs to be fixed.