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mac80211: add max channel calculation utility function

Browse source 
The utility function has no uses yet. It is aimed
at future chanctx reservation management and
channel switching.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michal Kazior 2014-04-09 15:29:23 +02:00 committed by Johannes Berg
parent 65a124dd71
commit 6fa001bc7e
2 changed files with 43 additions and 0 deletions
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1
net/mac80211/ieee80211_i.h
View file

@ -1822,6 +1822,7 @@ int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode chanmode,
u8 radar_detect);
int ieee80211_max_num_channels(struct ieee80211_local *local);
#ifdef CONFIG_MAC80211_NOINLINE
#define debug_noinline noinline

42
net/mac80211/util.c
View file

@ -2873,3 +2873,45 @@ int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
num_different_channels,
radar_detect, num);
}
static void
ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
void *data)
{
u32 *max_num_different_channels = data;
*max_num_different_channels = max(*max_num_different_channels,
c->num_different_channels);
}
int ieee80211_max_num_channels(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
int num[NUM_NL80211_IFTYPES] = {};
struct ieee80211_chanctx *ctx;
int num_different_channels = 0;
u8 radar_detect = 0;
u32 max_num_different_channels = 1;
int err;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(ctx, &local->chanctx_list, list) {
num_different_channels++;
if (ctx->conf.radar_enabled)
radar_detect |= BIT(ctx->conf.def.width);
}
list_for_each_entry_rcu(sdata, &local->interfaces, list)
num[sdata->wdev.iftype]++;
err = cfg80211_iter_combinations(local->hw.wiphy,
num_different_channels, radar_detect,
num, ieee80211_iter_max_chans,
&max_num_different_channels);
if (err < 0)
return err;
return max_num_different_channels;
}