Re: [RFC] mac80211_hwsim: notify user-space about channel change.

[Johannes Berg <johannes@sipsolutions.net>]

On Tue, 2015-02-17 at 15:59 -0800, greearb@candelatech.com wrote:
> From: Ben Greear <greearb@candelatech.com>
> 
> The goal is to allow the user-space application to properly
> filter packets before sending them down to the kernel.  This
> should more closely mimic what a real piece of hardware would
> do.

> + * @HWSIM_CMD_NOTIFY: notify user-space about driver changes.  This is
> + * designed to help the user-space app better emulate radio hardware.
> + * This command uses:
> + *      %HWSIM_ATTR_FREQ # Notify current operating center frequency.
> + *      %HWSIM_ATTR_ADDR_TRANSMITTER # ID which radio we are notifying about.
>   * @__HWSIM_CMD_MAX: enum limit

This seems a bit strange - don't we already tag packets with the
frequency? Why would you need the channel change separately? What does
that even mean? Depending on how you use this it could entirely break
off-channel operation, for example.

johannes