linux-kernel - Re: [PATCHv2 net] openvswitch: Fix mask generation for IPv6 labels.

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Message-Id: <201411191352.31914.joestringer@nicira.com>
Date:	Wed, 19 Nov 2014 13:52:31 -0800
From:	Joe Stringer <joestringer@...ira.com>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, pshelar@...ira.com,
	dev@...nvswitch.org
Subject: Re: [PATCHv2 net] openvswitch: Fix mask generation for IPv6 labels.

On Wednesday, November 19, 2014 13:20:01 Joe Stringer wrote:
> When userspace doesn't provide a mask, OVS datapath generates a fully
> unwildcarded mask for the flow. This is done by taking a copy of the
> flow key, then iterating across its attributes, setting all values to
> 0xff. This works for most attributes, as the length of the netlink
> attribute typically matches the length of the value. However, IPv6
> labels only use the lower 20 bits of the field. This patch makes a
> special case to handle this.
> 
> This fixes the following error seen when installing IPv6 flows without a
> mask:
> 
> openvswitch: netlink: Invalid IPv6 flow label value (value=ffffffff,
> max=fffff)

Based on offlist discussion with Pravin, I'll send a patch for an alternative 
approach.
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