On 14/10/12 16:48, Victor Goldenshtein wrote:
+static int nl80211_ap_channel_switch(struct sk_buff *skb,
+ struct genl_info *info)
+{
This function should probably enforce interface combinations with
`cfg80211_can_use_chan()`. Otherwise we might end up in a state which
doesn't correspond to any interface combination - and won't be able to
bring up new interfaces.
This however introduces a new problem. Let's suppose we have 2 APs on
channel 1. The device doesn't support multi-channel. We won't be able to
switch channel on these APs at all.
We might want to change the channel switch to resolve around the channel
itself (not the interface) - so we'd be saying "move all interfaces with
channel X to channel Y" instead of "move interface X to channel Y".
Or we could let the driver decide what it'll do - e.g. silently switch
more than one interface to a different channel (which makes sense with
AP/DFS I guess) and just notify cfg/userspace about it. That would
require us to provide a way to switch interfaces (atomically possibly)
between channels while keeping in sync with interface combinations though.
We might try addressing station CSA issue at the same time maybe?
-- Pozdrawiam / Best regards, Michal Kazior.
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