linux-kernel - Re: [PATCH] net: mvneta: use the correct napi pointer

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Message-ID: <20180810104055.0f009ed0@xhacker.debian>
Date:   Fri, 10 Aug 2018 10:40:55 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Marek Behún <marek.behun@....cz>,
        Tomas Hlavacek <tomas.hlavacek@....cz>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: mvneta: use the correct napi pointer

Hi,

On Thu, 9 Aug 2018 14:13:08 +0200 Andrew Lunn wrote:

> On Thu, Aug 09, 2018 at 08:02:42PM +0800, Jisheng Zhang wrote:
> > if neta_armada3700 is true, the mvneta_pcpu_port's napi is invalid, we
> > should use pp->napi instead. Fix mvneta_config_rss() with this method.
> > Although we can fix mvneta_rx_hwbm() and mvneta_rx_swbm() in the same
> > manner, the napi parm of mvneta_poll() is always correct, so we can
> > pass the correct napi param to mvneta_rx_hwbm() and mvneta_rx_swbm()
> > 
> > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>  
> 
> Hi Jisheng
> 
> How does this differ from

oops, I didn't monitor the net-next tree recently, glad to see it's fixed.
But the mvneta_config_rss() also need the fix. Since your patch is already
merged, so I will submit one separate patch to fix mvneta_config_rss().

Thanks a lot,
Jisheng

> 
> commit 7a86f05faf112463cfbbdfd222012e247de461a1
> Author: Andrew Lunn <andrew@...n.ch>
> Date:   Wed Jul 18 18:10:50 2018 +0200
> 
>     net: ethernet: mvneta: Fix napi structure mixup on armada 3700
>     
>     The mvneta Ethernet driver is used on a few different Marvell SoCs.
>     Some SoCs have per cpu interrupts for Ethernet events. Some SoCs have
>     a single interrupt, independent of the CPU. The driver handles this by
>     having a per CPU napi structure when there are per CPU interrupts, and
>     a global napi structure when there is a single interrupt.
>     
>     When the napi core calls mvneta_poll(), it passes the napi
>     instance. This was not being propagated through the call chain, and
>     instead the per-cpu napi instance was passed to napi_gro_receive()
>     call. This breaks when there is a single global napi instance.
>     
>     Signed-off-by: Andrew Lunn <andrew@...n.ch>
>     Fixes: 2636ac3cc2b4 ("net: mvneta: Add network support for Armada 3700 SoC")
>     Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> which is already in net-next, and i hope net?
> 
>       Andrew