mac80211: add support for Rx reordering offloading

Some drivers may be performing most of Tx/Rx
aggregation on their own (e.g. in firmware)
including AddBa/DelBa negotiations but may
otherwise require Rx reordering assistance.

The patch exports 2 new functions for establishing
Rx aggregation sessions in assumption device
driver has taken care of the necessary
negotiations.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
[fix endian bug]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 78 insertions, 23 deletions

diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
index d38c49b644cd..f0e84bc48038 100644
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -224,28 +224,15 @@ static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *d
         ieee80211_tx_skb(sdata, skb);
 }
 
-void ieee80211_process_addba_request(struct ieee80211_local *local,
-                                     struct sta_info *sta,
-                                     struct ieee80211_mgmt *mgmt,
-                                     size_t len)
+void __ieee80211_start_rx_ba_session(struct sta_info *sta,
+                                     u8 dialog_token, u16 timeout,
+                                     u16 start_seq_num, u16 ba_policy, u16 tid,
+                                     u16 buf_size, bool tx)
 {
+        struct ieee80211_local *local = sta->sdata->local;
         struct tid_ampdu_rx *tid_agg_rx;
-        u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
-        u8 dialog_token;
         int i, ret = -EOPNOTSUPP;
-
-        /* extract session parameters from addba request frame */
-        dialog_token = mgmt->u.action.u.addba_req.dialog_token;
-        timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
-        start_seq_num =
-                le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
-
-        capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
-        ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
-        tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
-        buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
-
-        status = WLAN_STATUS_REQUEST_DECLINED;
+        u16 status = WLAN_STATUS_REQUEST_DECLINED;
 
         if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
                 ht_dbg(sta->sdata,
@@ -264,7 +251,7 @@ void ieee80211_process_addba_request(struct ieee80211_local *local,
                 status = WLAN_STATUS_INVALID_QOS_PARAM;
                 ht_dbg_ratelimited(sta->sdata,
                                    "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n",
-                                   mgmt->sa, tid, ba_policy, buf_size);
+                                   sta->sta.addr, tid, ba_policy, buf_size);
                 goto end_no_lock;
         }
         /* determine default buffer size */
@@ -281,7 +268,7 @@ void ieee80211_process_addba_request(struct ieee80211_local *local,
         if (sta->ampdu_mlme.tid_rx[tid]) {
                 ht_dbg_ratelimited(sta->sdata,
                                    "unexpected AddBA Req from %pM on tid %u\n",
-                                   mgmt->sa, tid);
+                                   sta->sta.addr, tid);
 
                 /* delete existing Rx BA session on the same tid */
                 ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
@@ -353,6 +340,74 @@ end:
         mutex_unlock(&sta->ampdu_mlme.mtx);
 
 end_no_lock:
-        ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
-                                  dialog_token, status, 1, buf_size, timeout);
+        if (tx)
+                ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
+                                          dialog_token, status, 1, buf_size,
+                                          timeout);
+}
+
+void ieee80211_process_addba_request(struct ieee80211_local *local,
+                                     struct sta_info *sta,
+                                     struct ieee80211_mgmt *mgmt,
+                                     size_t len)
+{
+        u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num;
+        u8 dialog_token;
+
+        /* extract session parameters from addba request frame */
+        dialog_token = mgmt->u.action.u.addba_req.dialog_token;
+        timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
+        start_seq_num =
+                le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
+
+        capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
+        ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
+        tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
+        buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
+
+        __ieee80211_start_rx_ba_session(sta, dialog_token, timeout,
+                                        start_seq_num, ba_policy, tid,
+                                        buf_size, true);
+}
+
+void ieee80211_start_rx_ba_session_offl(struct ieee80211_vif *vif,
+                                        const u8 *addr, u16 tid)
+{
+        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+        struct ieee80211_local *local = sdata->local;
+        struct ieee80211_rx_agg *rx_agg;
+        struct sk_buff *skb = dev_alloc_skb(0);
+
+        if (unlikely(!skb))
+                return;
+
+        rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
+        memcpy(&rx_agg->addr, addr, ETH_ALEN);
+        rx_agg->tid = tid;
+
+        skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_START;
+        skb_queue_tail(&sdata->skb_queue, skb);
+        ieee80211_queue_work(&local->hw, &sdata->work);
+}
+EXPORT_SYMBOL(ieee80211_start_rx_ba_session_offl);
+
+void ieee80211_stop_rx_ba_session_offl(struct ieee80211_vif *vif,
+                                       const u8 *addr, u16 tid)
+{
+        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+        struct ieee80211_local *local = sdata->local;
+        struct ieee80211_rx_agg *rx_agg;
+        struct sk_buff *skb = dev_alloc_skb(0);
+
+        if (unlikely(!skb))
+                return;
+
+        rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
+        memcpy(&rx_agg->addr, addr, ETH_ALEN);
+        rx_agg->tid = tid;
+
+        skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_STOP;
+        skb_queue_tail(&sdata->skb_queue, skb);
+        ieee80211_queue_work(&local->hw, &sdata->work);
 }
+EXPORT_SYMBOL(ieee80211_stop_rx_ba_session_offl);