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mac80211: aggregation: Convert timers to use timer_setup()

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In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

This removes the tid mapping array and expands the tid structures to
add a pointer back to the station, along with the tid index itself.

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
[switch tid variables to u8, the valid range is 0-15 at most,
 initialize tid_tx->sta/tid properly]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Kees Cook
2017-10-17 13:25:45 -07:00
committed by Johannes Berg
parent 44905265bc
commit 7cca2acdff
4 changed files with 45 additions and 60 deletions
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41
net/mac80211/agg-rx.c
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@@ -151,21 +151,17 @@ EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
* After accepting the AddBA Request we activated a timer,
* resetting it after each frame that arrives from the originator.
*/
static void sta_rx_agg_session_timer_expired(unsigned long data)
static void sta_rx_agg_session_timer_expired(struct timer_list *t)
{
/* not an elegant detour, but there is no choice as the timer passes
* only one argument, and various sta_info are needed here, so init
* flow in sta_info_create gives the TID as data, while the timer_to_id
* array gives the sta through container_of */
u8 *ptid = (u8 *)data;
u8 *timer_to_id = ptid - *ptid;
struct sta_info *sta = container_of(timer_to_id, struct sta_info,
timer_to_tid[0]);
struct tid_ampdu_rx *tid_rx_timer =
from_timer(tid_rx_timer, t, session_timer);
struct sta_info *sta = tid_rx_timer->sta;
u8 tid = tid_rx_timer->tid;
struct tid_ampdu_rx *tid_rx;
unsigned long timeout;
rcu_read_lock();
tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[*ptid]);
tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
if (!tid_rx) {
rcu_read_unlock();
return;
@@ -180,21 +176,18 @@ static void sta_rx_agg_session_timer_expired(unsigned long data)
rcu_read_unlock();
ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n",
sta->sta.addr, (u16)*ptid);
sta->sta.addr, tid);
set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired);
ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
}
static void sta_rx_agg_reorder_timer_expired(unsigned long data)
static void sta_rx_agg_reorder_timer_expired(struct timer_list *t)
{
u8 *ptid = (u8 *)data;
u8 *timer_to_id = ptid - *ptid;
struct sta_info *sta = container_of(timer_to_id, struct sta_info,
timer_to_tid[0]);
struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, reorder_timer);
rcu_read_lock();
ieee80211_release_reorder_timeout(sta, *ptid);
ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid);
rcu_read_unlock();
}
@@ -356,14 +349,12 @@ void ___ieee80211_start_rx_ba_session(struct sta_info *sta,
spin_lock_init(&tid_agg_rx->reorder_lock);
/* rx timer */
setup_deferrable_timer(&tid_agg_rx->session_timer,
sta_rx_agg_session_timer_expired,
(unsigned long)&sta->timer_to_tid[tid]);
timer_setup(&tid_agg_rx->session_timer,
sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE);
/* rx reorder timer */
setup_timer(&tid_agg_rx->reorder_timer,
sta_rx_agg_reorder_timer_expired,
(unsigned long)&sta->timer_to_tid[tid]);
timer_setup(&tid_agg_rx->reorder_timer,
sta_rx_agg_reorder_timer_expired, 0);
/* prepare reordering buffer */
tid_agg_rx->reorder_buf =
@@ -399,6 +390,8 @@ void ___ieee80211_start_rx_ba_session(struct sta_info *sta,
tid_agg_rx->auto_seq = auto_seq;
tid_agg_rx->started = false;
tid_agg_rx->reorder_buf_filtered = 0;
tid_agg_rx->tid = tid;
tid_agg_rx->sta = sta;
status = WLAN_STATUS_SUCCESS;
/* activate it for RX */