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mac80211: reuse channels for channel contexts 

Reuse channels with compatible channel types. Some
channel types are compatible and can be used
concurrently.

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 2012-06-26 14:37:22 +02:00 committed by Johannes Berg
parent 35f2fce9a4
commit e89a96f5cc
1 changed files with 58 additions and 1 deletions
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59
net/mac80211/chan.c
View File

@ -167,7 +167,17 @@ bool ieee80211_set_channel_type(struct ieee80211_local *local,
sdata->vif.bss_conf.channel_type = chantype; sdata->vif.bss_conf.channel_type = chantype;
return true; return true;
}
static void ieee80211_change_chantype(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
enum nl80211_channel_type chantype)
{
if (chantype == ctx->conf.channel_type)
return;
ctx->conf.channel_type = chantype;
drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_CHANNEL_TYPE);
} }
static struct ieee80211_chanctx * static struct ieee80211_chanctx *
@ -177,6 +187,7 @@ ieee80211_find_chanctx(struct ieee80211_local *local,
enum ieee80211_chanctx_mode mode) enum ieee80211_chanctx_mode mode)
{ {
struct ieee80211_chanctx *ctx; struct ieee80211_chanctx *ctx;
enum nl80211_channel_type compat_type;
lockdep_assert_held(&local->chanctx_mtx); lockdep_assert_held(&local->chanctx_mtx);
@ -186,13 +197,19 @@ ieee80211_find_chanctx(struct ieee80211_local *local,
return NULL; return NULL;
list_for_each_entry(ctx, &local->chanctx_list, list) { list_for_each_entry(ctx, &local->chanctx_list, list) {
compat_type = ctx->conf.channel_type;
if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
continue; continue;
if (ctx->conf.channel != channel) if (ctx->conf.channel != channel)
continue; continue;
if (ctx->conf.channel_type != channel_type) if (!ieee80211_channel_types_are_compatible(ctx->conf.channel_type,
channel_type,
&compat_type))
continue; continue;
ieee80211_change_chantype(local, ctx, compat_type);
return ctx; return ctx;
} }
@ -260,6 +277,43 @@ static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
return 0; return 0;
} }
static enum nl80211_channel_type
ieee80211_calc_chantype(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_chanctx_conf *conf = &ctx->conf;
struct ieee80211_sub_if_data *sdata;
enum nl80211_channel_type result = NL80211_CHAN_NO_HT;
lockdep_assert_held(&local->chanctx_mtx);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
continue;
WARN_ON_ONCE(!ieee80211_channel_types_are_compatible(
sdata->vif.bss_conf.channel_type,
result, &result));
}
rcu_read_unlock();
return result;
}
static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
enum nl80211_channel_type chantype;
lockdep_assert_held(&local->chanctx_mtx);
chantype = ieee80211_calc_chantype(local, ctx);
ieee80211_change_chantype(local, ctx, chantype);
}
static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata, static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
struct ieee80211_chanctx *ctx) struct ieee80211_chanctx *ctx)
{ {
@ -271,6 +325,9 @@ static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
drv_unassign_vif_chanctx(local, sdata, ctx); drv_unassign_vif_chanctx(local, sdata, ctx);
if (ctx->refcount > 0)
ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
} }
static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)