netdev - Re: [PATCH net 2/2] sfc: do not initialize non existing queues with efx_separate_tx

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Message-ID: <CACT4ouf7P=jq8RM+3WOCVKhNi6mBAunuw65zgTHmHmzw8v-fqg@mail.gmail.com>
Date:   Tue, 24 May 2022 17:36:49 +0200
From:   Íñigo Huguet <ihuguet@...hat.com>
To:     Íñigo Huguet <ihuguet@...hat.com>,
        Tianhao Zhao <tizhao@...hat.com>,
        Edward Cree <ecree.xilinx@...il.com>, amaftei@...arflare.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net 2/2] sfc: do not initialize non existing queues with efx_separate_tx_channels

On Fri, May 13, 2022 at 2:37 PM Martin Habets <habetsm.xilinx@...il.com> wrote:
>
> On Fri, May 13, 2022 at 12:07:23PM +0100, Martin Habets wrote:
> > On Wed, May 11, 2022 at 02:59:41PM +0200, Íñigo Huguet wrote:
> > > If efx_separate_tx_channels is used, some error messages and backtraces
> > > are shown in the logs (see below). This is because during channels
> > > start, all queues in the channels are init asumming that they exist, but
> > > they might not if efx_separate_tx_channels is used: some channels only
> > > have RX queues and others only have TX queues.
> >
> > Thanks for reporting this. At first glance I suspect there may be more callers
> > of efx_for_each_channel_tx_queue() which is why it is not yet working for you
> > even with this fix.
> > Probably we need to fix those macros themselves.
> >
> > I'm having a closer look, but it will take some time.
>
> It was easier than I thought. With the patch below I do not get any errors,
> and ping works. I did not have to touch efx_for_each_channel_rx_queue().
> Can you give this a try and report if it works for you?

Martin, this is working fine for me. Module loads and unloads without
errors, and I can ping and run an iperf3 test also without errors.

How do you want to do it? Should I send this patch on your behalf
within my patch series? Or do you want to send it yourself first?

>
> Martin
> ---
>  drivers/net/ethernet/sfc/net_driver.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
> index 318db906a154..723bbeea5d0c 100644
> --- a/drivers/net/ethernet/sfc/net_driver.h
> +++ b/drivers/net/ethernet/sfc/net_driver.h
> @@ -1530,7 +1530,7 @@ static inline bool efx_channel_is_xdp_tx(struct efx_channel *channel)
>
>  static inline bool efx_channel_has_tx_queues(struct efx_channel *channel)
>  {
> -       return true;
> +       return channel && channel->channel >= channel->efx->tx_channel_offset;
>  }
>
>  static inline unsigned int efx_channel_num_tx_queues(struct efx_channel *channel)
>


-- 
Íñigo Huguet