On 4/10/2012 2:20 PM, Johannes Berg wrote:
I don't get this patch at all. Why am I reviewing some very very basic
skeleton code when we should be discussing userspace APIs (we have
already discussed them with a few people years ago), how the AMP is
going to be managed, how the security handshake is going to work, etc.
adding AMP (meaning Bluetooth Alternate MAC/PHY in case anybody cares)
for SoftMac WiFi cards should be done solely in kernel space between
Bluetooth core and mac80211. All the FullMac cards will expose the HCI
AMP directly via the Bluetooth core. See Marvell solution for example.
If we require a userspace interaction, I think we are doing something
wrong here. And as far as I can tell, the only tricky part is the WPA2
PSK 4-way handshake. We would need a kernel implementation for that.
You already know I disagree, I don't want this code re-implemented in
kernel space when adding a few tightly controlled APIs is all it needs
to use an existing implementation of the relevant mechanisms.
There are also additional complexities like wpa_supplicant having to
know whether to set up/tear down a BT AMP interface for P2P concurrency
etc., so it's not really a good idea anyway to implement it purely in
kernel space and hope it'll all work out.
(My flight is boarding now so I can't elaborate or discuss right now.)
johannes
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