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

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Date:   Tue, 21 Mar 2023 13:55:15 +0530
From:   Pavan Chebbi <pavan.chebbi@...adcom.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>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH] net/net_failover: fix queue exceeding warning

On Tue, Mar 21, 2023 at 11:17 AM Faicker Mo <faicker.mo@...oud.cn> wrote:
>
> When tx from the net_failover device, the actual tx queue number is the salve device.

Then why is primary OK..

> The ndo_select_queue of net_failover device returns the txq which is the primary device txq
> if the primary device is OK.

This is what is done in all the functions. I don't think there is a problem.
Not sure if there is an issue I am not getting, at least with the description.
I will let the maintainer take the call. Thanks.

> This number may be bigger than the default 16 of the net_failover device.
>  A warning will be reported in netdev_cap_txqueue which device is the net_failover.
>
>
> From: Pavan Chebbi <pavan.chebbi@...adcom.com>
>  Date: 2023-03-21 13:11:52
> 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>,Paolo Abeni <pabeni@...hat.com>,netdev@...r.kernel.org,linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] net/net_failover: fix queue exceeding warning>On Tue, Mar 21, 2023 at 8:15 AM Faicker Mo <faicker.mo@...oud.cn> 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.
> >>
> >
> >Can you describe the issue more? If the net device has not implemented
> >its own selection then netdev_pick_tx should take care of the
> >real_num_tx_queues.
> >Is that not happening?
> >
> >> Signed-off-by: Faicker Mo <faicker.mo@...oud.cn>
> >> ---
> >>  drivers/net/net_failover.c | 8 ++------
> >>  1 file changed, 2 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/drivers/net/net_failover.c b/drivers/net/net_failover.c
> >> index 7a28e082436e..d0c916a53d7c 100644
> >> --- a/drivers/net/net_failover.c
> >> +++ b/drivers/net/net_failover.c
> >> @@ -130,14 +130,10 @@ static u16 net_failover_select_queue(struct net_device *dev,
> >>                         txq = ops->ndo_select_queue(primary_dev, skb, sb_dev);
> >>                 else
> >>                         txq = netdev_pick_tx(primary_dev, skb, NULL);
> >> -
> >> -               qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
> >> -
> >> -               return txq;
> >> +       } else {
> >> +               txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
> >>         }
> >>
> >> -       txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
> >> -
> >>         /* Save the original txq to restore before passing to the driver */
> >>         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
> >>
> >> --
> >> 2.39.1
> >>
>
>

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