linux-kernel - Re: [PATCH net-next] xen-netfront: fix queue name setting

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Message-Id: <20180722.102724.533759585465302686.davem@davemloft.net>
Date:   Sun, 22 Jul 2018 10:27:24 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     vkuznets@...hat.com
Cc:     netdev@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, boris.ostrovsky@...cle.com,
        jgross@...e.com, ross.lagerwall@...rix.com
Subject: Re: [PATCH net-next] xen-netfront: fix queue name setting

From: Vitaly Kuznetsov <vkuznets@...hat.com>
Date: Fri, 20 Jul 2018 18:33:59 +0200

> Commit f599c64fdf7d ("xen-netfront: Fix race between device setup and
> open") changed the initialization order: xennet_create_queues() now
> happens before we do register_netdev() so using netdev->name in
> xennet_init_queue() is incorrect, we end up with the following in
> /proc/interrupts:
> 
>  60:        139          0   xen-dyn    -event     eth%d-q0-tx
>  61:        265          0   xen-dyn    -event     eth%d-q0-rx
>  62:        234          0   xen-dyn    -event     eth%d-q1-tx
>  63:          1          0   xen-dyn    -event     eth%d-q1-rx
> 
> and this looks ugly. Actually, using early netdev name (even when it's
> already set) is also not ideal: nowadays we tend to rename eth devices
> and queue name may end up not corresponding to the netdev name.
> 
> Use nodename from xenbus device for queue naming: this can't change in VM's
> lifetime. Now /proc/interrupts looks like
> 
>  62:        202          0   xen-dyn    -event     device/vif/0-q0-tx
>  63:        317          0   xen-dyn    -event     device/vif/0-q0-rx
>  64:        262          0   xen-dyn    -event     device/vif/0-q1-tx
>  65:         17          0   xen-dyn    -event     device/vif/0-q1-rx
> 
> Fixes: f599c64fdf7d ("xen-netfront: Fix race between device setup and open")
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>

Patch applied, thank you.