netdev - Re: [DISCUSS] Bond arp monitor not works with veth due to flag NETIF_F

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Date:   Thu, 18 Nov 2021 18:17:14 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     netdev@...r.kernel.org, Jay Vosburgh <jay.vosburgh@...onical.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Jarod Wilson <jarod@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...nulli.us>, davem@...emloft.net,
        Denis Kirjanov <dkirjanov@...e.de>,
        David Ahern <dsahern@...il.com>
Subject: Re: [DISCUSS] Bond arp monitor not works with veth due to flag
 NETIF_F_LLTX.

On Wed, Nov 17, 2021 at 07:34:40PM -0800, Eric Dumazet wrote:
> Removing LLTX will have performance impact.

Yes, I also think so.
> 
> Updating ->trans_start at most once per jiffy should be ok.
> 
> Here is a patch against net-next
> @@ -4626,7 +4620,7 @@ static inline netdev_tx_t
> netdev_start_xmit(struct sk_buff *skb, struct net_devi
> 
>         rc = __netdev_start_xmit(ops, skb, dev, more);
>         if (rc == NETDEV_TX_OK)
> -               txq_trans_update(txq);
> +               txq_trans_cond_update(txq);
> 
>         return rc;
>  }

Awesome. This should resolve the veth's trans_start issue. Where is the patch?
I only find out the following one but could not find the fix in netdev_start_xmit()

https://patchwork.kernel.org/project/netdevbpf/patch/20211117032924.1740327-3-eric.dumazet@gmail.com/

Thanks
Hangbin