linux-kernel - Re: [PATCH] net/net_failover: fix queue exceeding warning

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Message-ID: <7755c026ea1f2c5f6d00aa4ba17233eb511ce3dd.camel@redhat.com>
Date:   Wed, 22 Mar 2023 12:40:44 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Faicker Mo <faicker.mo@...oud.cn>
Cc:     Sridhar Samudrala <sridhar.samudrala@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/net_failover: fix queue exceeding warning

On Tue, 2023-03-21 at 10:29 +0800, Faicker Mo wrote:
> If the primary device queue number is bigger than the default 16,
> there is a warning about the queue exceeding when tx from the
> net_failover device.
> 
> Signed-off-by: Faicker Mo <faicker.mo@...oud.cn>

This looks like a fixes, so it should include at least a fixes tag.

More importantly a longer/clearer description of the issue is needed,
including the warning backtrace.

I think this warning:

https://elixir.bootlin.com/linux/latest/source/include/linux/netdevice.h#L3542

should not be ignored/silenced: it's telling that the running
configuration is not using a number of the available tx queues, which
is possibly not the thing you want.

Instead the failover device could use an higher number of tx queues and
eventually set real_num_tx_queues equal to the primary_dev when the
latter is enslaved.

Thanks,

Paolo