netdev - Re: [PATCH net] net: mvneta: do not redirect frames during reconfiguration

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Message-ID: <20200609074110.GA2067@localhost.localdomain>
Date:   Tue, 9 Jun 2020 09:41:10 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        thomas.petazzoni@...tlin.com, lorenzo.bianconi@...hat.com,
        brouer@...hat.com
Subject: Re: [PATCH net] net: mvneta: do not redirect frames during
 reconfiguration

> On Tue, Jun 09, 2020 at 12:02:39AM +0200, Lorenzo Bianconi wrote:
> > Disable frames injection in mvneta_xdp_xmit routine during hw
> > re-configuration in order to avoid hardware hangs
> 
> Hi Lorenzo
> 
> Why does mvneta_tx() also not need the same protection?
> 
>     Andrew

Hi Andrew,

So far I have not been able to trigger the issue in the legacy tx path.
I hit the problem adding the capability to attach an eBPF program to CPUMAP
entries [1]. In particular I am redirecting traffic to mvneta and concurrently
attaching/removing a XDP program to/from it.
I am not sure this can occur running mvneta_tx().
Moreover it seems a common pattern for .ndo_xdp_xmit() in other drivers
(e.g ixgbe, bnxt, mlx5)

Regards,
Lorenzo

[1] https://patchwork.ozlabs.org/project/netdev/cover/cover.1590960613.git.lorenzo@kernel.org/

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