netdev - Can ndo_select_queue save data in skb->cb?

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Message-ID: <545A64EC.309@openvpn.net>
Date:	Wed, 05 Nov 2014 10:57:00 -0700
From:	James Yonan <james@...nvpn.net>
To:	netdev <netdev@...r.kernel.org>
Subject: Can ndo_select_queue save data in skb->cb?

Is it permissible for a net driver's ndo_select_queue method to save 
data in skb->cb for later use in ndo_start_xmit?

Also, is it necessary for users of skb->cb to zero out their private 
data after use to prevent it from being misinterpreted by other layers? 
  I noticed some commits in the log (such as 462fb2) are zeroing out the 
skb->cb area for this reason.

Thanks,
James
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