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 <AHkARAASI0ycAeWt4ZCNhKpF.3.1679377487974.Hmail.mocan@ucloud.cn>
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From:   Pavan Chebbi <pavan.chebbi@broadcom.com>
Date:   Tue, 21 Mar 2023 13:55:15 +0530
Message-ID: <CALs4sv0rK7+PhwawDGt0q3mdoD3ncmLQHSXkqYMofp6rSOa3Ug@mail.gmail.com>
Subject: Re: Re: [PATCH] net/net_failover: fix queue exceeding warning
To:     Faicker Mo <faicker.mo@ucloud.cn>
Cc:     Sridhar Samudrala <sridhar.samudrala@intel.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
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On Tue, Mar 21, 2023 at 11:17=E2=80=AFAM Faicker Mo <faicker.mo@ucloud.cn> =
wrote:
>
> When tx from the net_failover device, the actual tx queue number is the s=
alve 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 descripti=
on.
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@broadcom.com>
>  Date: 2023-03-21 13:11:52
> To:Faicker Mo <faicker.mo@ucloud.cn>
>  cc: Sridhar Samudrala <sridhar.samudrala@intel.com>,"David S. Miller" <d=
avem@davemloft.net>,Eric Dumazet <edumazet@google.com>,Jakub Kicinski <kuba=
@kernel.org>,Paolo Abeni <pabeni@redhat.com>,netdev@vger.kernel.org,linux-k=
ernel@vger.kernel.org
> Subject: Re: [PATCH] net/net_failover: fix queue exceeding warning>On Tue=
, Mar 21, 2023 at 8:15=E2=80=AFAM Faicker Mo <faicker.mo@ucloud.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@ucloud.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 =3D ops->ndo_select_queue(primary_dev, skb=
, sb_dev);
> >>                 else
> >>                         txq =3D netdev_pick_tx(primary_dev, skb, NULL)=
;
> >> -
> >> -               qdisc_skb_cb(skb)->slave_dev_queue_mapping =3D skb->qu=
eue_mapping;
> >> -
> >> -               return txq;
> >> +       } else {
> >> +               txq =3D skb_rx_queue_recorded(skb) ? skb_get_rx_queue(=
skb) : 0;
> >>         }
> >>
> >> -       txq =3D skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0=
;
> >> -
> >>         /* Save the original txq to restore before passing to the driv=
er */
> >>         qdisc_skb_cb(skb)->slave_dev_queue_mapping =3D skb->queue_mapp=
ing;
> >>
> >> --
> >> 2.39.1
> >>
>
>

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