netdev - Re: [PATCH 1/1] xen-netback: add reference from xenvif to backend

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Message-ID: <20190412142851.GK30543@zion.uk.xensource.com>
Date:   Fri, 12 Apr 2019 15:28:51 +0100
From:   Wei Liu <wei.liu2@...rix.com>
To:     Dongli Zhang <dongli.zhang@...cle.com>
CC:     <xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <wei.liu2@...rix.com>,
        <paul.durrant@...rix.com>, <davem@...emloft.net>,
        <joe.jin@...cle.com>, <junxiao.bi@...cle.com>,
        <jie.l.li@...cle.com>
Subject: Re: [PATCH 1/1] xen-netback: add reference from xenvif to
 backend_info to facilitate coredump analysis

On Fri, Apr 12, 2019 at 02:53:24PM +0800, Dongli Zhang wrote:
> During coredump analysis, it is not easy to obtain the address of
> backend_info in xen-netback.
> 
> So far there are two ways to obtain backend_info:
> 
> 1. Do what xenbus_device_find() does for vmcore to find the xenbus_device
> and then derive it from dev_get_drvdata().
> 
> 2. Extract backend_info from callstack of xenwatch (e.g., netback_remove()
> or frontend_changed()).
> 
> This patch adds a reference from xenvif to backend_info so that it would be
> much more easier to obtain backend_info during coredump analysis.
> 
> Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>

Acked-by: Wei Liu <wei.liu2@...rix.com>