@@ -5,7 +5,7 @@
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
- * Copyright (C) 2015 Intel Deutschland GmbH
+ * Copyright (C) 2015 - 2016 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -5192,6 +5192,24 @@ void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
const u8 *addr);
/**
+ * ieee80211_mark_rx_ba_filtered_frames - move RX BA window and mark filtered
+ * @pubsta: station struct
+ * @tid: the session's TID
+ * @ssn: starting sequence number of the bitmap, all frames before this are
+ * assumed to be out of the window after the call
+ * @filtered: bitmap of filtered frames, BIT(0) is the @ssn entry etc.
+ * @received_mpdus: number of received mpdus in firmware
+ *
+ * This function moves the BA window and releases all frames before @ssn, and
+ * marks frames marked in the bitmap as having been filtered. Afterwards, it
+ * checks if any frames in the window starting from @ssn can now be released
+ * (in case they were only waiting for frames that were filtered.)
+ */
+void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
+ u16 ssn, u64 filtered,
+ u16 received_mpdus);
+
+/**
* ieee80211_send_bar - send a BlockAckReq frame
*
* can be used to flush pending frames from the peer's aggregation reorder
@@ -376,6 +376,7 @@ void __ieee80211_start_rx_ba_session(struct sta_info *sta,
tid_agg_rx->timeout = timeout;
tid_agg_rx->stored_mpdu_num = 0;
tid_agg_rx->auto_seq = auto_seq;
+ tid_agg_rx->reorder_buf_filtered = 0;
status = WLAN_STATUS_SUCCESS;
/* activate it for RX */
@@ -19,6 +19,7 @@
#include <linux/etherdevice.h>
#include <linux/rcupdate.h>
#include <linux/export.h>
+#include <linux/bitops.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <asm/unaligned.h>
@@ -806,6 +807,9 @@ static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx,
struct sk_buff *tail = skb_peek_tail(frames);
struct ieee80211_rx_status *status;
+ if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index))
+ return true;
+
if (!tail)
return false;
@@ -844,6 +848,7 @@ static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
}
no_frame:
+ tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
}
@@ -3299,6 +3304,85 @@ void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
ieee80211_rx_handlers(&rx, &frames);
}
+void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
+ u16 ssn, u64 filtered,
+ u16 received_mpdus)
+{
+ struct sta_info *sta;
+ struct tid_ampdu_rx *tid_agg_rx;
+ struct sk_buff_head frames;
+ struct ieee80211_rx_data rx = {
+ /* This is OK -- must be QoS data frame */
+ .security_idx = tid,
+ .seqno_idx = tid,
+ };
+ int i, diff;
+
+ if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS))
+ return;
+
+ __skb_queue_head_init(&frames);
+
+ sta = container_of(pubsta, struct sta_info, sta);
+
+ rx.sta = sta;
+ rx.sdata = sta->sdata;
+ rx.local = sta->local;
+
+ rcu_read_lock();
+ tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
+ if (!tid_agg_rx)
+ goto out;
+
+ spin_lock_bh(&tid_agg_rx->reorder_lock);
+
+ if (received_mpdus >= IEEE80211_SN_MODULO >> 1) {
+ int release;
+
+ /* release all frames in the reorder buffer */
+ release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) %
+ IEEE80211_SN_MODULO;
+ ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx,
+ release, &frames);
+ /* update ssn to match received ssn */
+ tid_agg_rx->head_seq_num = ssn;
+ } else {
+ ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn,
+ &frames);
+ }
+
+ /* handle the case that received ssn is behind the mac ssn.
+ * it can be tid_agg_rx->buf_size behind and still be valid */
+ diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK;
+ if (diff >= tid_agg_rx->buf_size) {
+ tid_agg_rx->reorder_buf_filtered = 0;
+ goto release;
+ }
+ filtered = filtered >> diff;
+ ssn += diff;
+
+ /* update bitmap */
+ for (i = 0; i < tid_agg_rx->buf_size; i++) {
+ int index = (ssn + i) % tid_agg_rx->buf_size;
+
+ tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index);
+ if (filtered & BIT_ULL(i))
+ tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index);
+ }
+
+ /* now process also frames that the filter marking released */
+ ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
+
+release:
+ spin_unlock_bh(&tid_agg_rx->reorder_lock);
+
+ ieee80211_rx_handlers(&rx, &frames);
+
+ out:
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames);
+
/* main receive path */
static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
@@ -168,6 +168,8 @@ struct tid_ampdu_tx {
*
* @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an
* A-MSDU with individually reported subframes.
+ * @reorder_buf_filtered: bitmap indicating where there are filtered frames in
+ * the reorder buffer that should be ignored when releasing frames
* @reorder_time: jiffies when skb was added
* @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
* @reorder_timer: releases expired frames from the reorder buffer.
@@ -195,6 +197,7 @@ struct tid_ampdu_tx {
struct tid_ampdu_rx {
struct rcu_head rcu_head;
spinlock_t reorder_lock;
+ u64 reorder_buf_filtered;
struct sk_buff_head *reorder_buf;
unsigned long *reorder_time;
struct timer_list session_timer;