netdev - changing dev->needed_headroom/needed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 26 Jul 2013 16:50:10 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	netdev@...r.kernel.org
Cc:	linux-wireless@...r.kernel.org
Subject: changing dev->needed_headroom/needed_tailroom?

Does it seem reasonable to change dev->needed_headroom and
dev->needed_tailroom on the fly?

We currently set needed_headroom to the max of what we need, but we
could do better like making it depend on the interface type (e.g. only
asking for mesh space on mesh interfaces). This would be done only when
the interface isn't connected, I can't promise it would be down but the
carrier would be off.

Another thing we might want to do is change it according to the
currently configured crypto (this would also affect
dev->needed_tailroom) since we actually only need tailroom when TKIP is
used. This could might be done on the fly, but could also be done when
the carrier is still down during connection establishment (which would
not be a complete optimisation but still be better than what we have
now)

Thoughts?

johannes

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html