netdev - Re: [PATCH net-next] rtnl_fdb_dump: catch errors from ndo_fdb_dump and ndo_dflt_fdb

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Date:	Wed, 23 Sep 2015 21:59:17 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, Dept-GELinuxNICDev@...gic.com,
	Jiří Pírko <jiri@...nulli.us>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Wilson Kok <wkok@...ulusnetworks.com>,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: Re: [PATCH net-next] rtnl_fdb_dump: catch errors from ndo_fdb_dump
 and ndo_dflt_fdb_dump

On Wed, Sep 23, 2015 at 9:21 AM, Roopa Prabhu <roopa@...ulusnetworks.com> wrote:
> From: Wilson Kok <wkok@...ulusnetworks.com>
>
> current ndo_fdb_dump and ndo_dflt_fdb_dump always return the current
> fdb index. They dont return errors. Which results in fdb dumps
> continuing on errors.
>
> In one such case where bridges and vxlan devices were involved,
> bridge driver returned -EMSGSIZE on a bridge, but since it continued
> on error, the next vxlan device fdb dump (which was smaller in size)
> succeeded, leaving fdb idx at an inconsistent value. This
> resulted in the bridge fdb entry getting skipped and vxlan
> fdb entry getting dumped twice.
>
> This patch changes ndo_fdb_dump() to return the status and pass the
> idx by reference for update. The dump aborts if non-zero status is
> returned.
>
> Signed-off-by: Wilson Kok <wkok@...ulusnetworks.com>
> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>

Reviewed-by: Scott Feldman <sfeldma@...il.com>
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