Re: [RFC 6/9] mac80211: add ap channel switch command/event

[Johannes Berg <johannes@sipsolutions.net>]

On 1/26/2012 4:38 AM, Victor Goldenshtein wrote:
> New ieee80211_ap_process_chanswitch(), to handle a channel switch
> request for AP/GO.
>
> New 'post_switch_block_tx' parameter in 'ieee80211_channel_switch'
> structure, which indicates whether transmission must be blocked after
> the scheduled channel switch, it should be set if the target channel
> is DFS channel.
>
> New ieee80211_ap_ch_switch_complete_notify() which notifies upper
> layers about channel switch complete event.

Shouldn't mac80211 have some non-offload implementation for this?

> @@ -841,12 +841,16 @@ struct ieee80211_conf {
>    *	the driver passed into mac80211.
>    * @block_tx: Indicates whether transmission must be blocked before the
>    *	scheduled channel switch, as indicated by the AP.
> + * @post_switch_block_tx: Indicates whether transmission must be blocked after
> + *	the scheduled channel switch, this should be set if the target channel
> + *	is DFS channel.

Hmmm. This channel switch stuff here was really intended for client-side 
channel switching initially ... and it should quite possibly be a 
different mechanism?

> +static int ieee80211_ap_process_chanswitch(struct wiphy *wiphy,
> +					   struct net_device *dev,
> +					   u32 count, bool block_tx,
> +					   bool post_switch_block_tx,
> +					   u32 new_freq)
> +{
> +	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
> +	struct ieee80211_local *local = sdata->local;
> +	struct ieee80211_channel *new_ch;
> +	struct ieee80211_channel_switch ch_switch;
> +
> +	new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
> +	if (!new_ch || new_ch->flags&  IEEE80211_CHAN_DISABLED) {
> +		wiphy_debug(local->hw.wiphy,
> +			    "failed channel switch on freq: %d\n", new_freq);
> +		return -EINVAL;
> +	}

That code should obviously be in cfg80211.

> @@ -2793,4 +2826,5 @@ struct cfg80211_ops mac80211_config_ops = {
>   	.set_noack_map = ieee80211_set_noack_map,
>   	.dfs_start_radar_detection = ieee80211_dfs_start_radar_detection,
>   	.dfs_en_tx = ieee80211_dfs_en_tx,
> +	.ap_channel_switch = ieee80211_ap_process_chanswitch,

why deviate from the ieee80211_ + callback_name scheme?

johannes