From 08cf42e843f9a7e253502011c81677f61f7e5c42 Mon Sep 17 00:00:00 2001 From: Michal Kazior Date: Wed, 16 Jul 2014 12:12:15 +0200 Subject: [PATCH] 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 [fix endian bug] Signed-off-by: Johannes Berg --- include/net/mac80211.h | 34 +++++++++++++ net/mac80211/agg-rx.c | 101 ++++++++++++++++++++++++++++--------- net/mac80211/ieee80211_i.h | 11 ++++ net/mac80211/iface.c | 29 +++++++++++ 4 files changed, 152 insertions(+), 23 deletions(-) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 9ce5cb17ed82..dae2e24616e1 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -4552,6 +4552,40 @@ void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, */ void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn); +/** + * ieee80211_start_rx_ba_session_offl - start a Rx BA session + * + * Some device drivers may offload part of the Rx aggregation flow including + * AddBa/DelBa negotiation but may otherwise be incapable of full Rx + * reordering. + * + * Create structures responsible for reordering so device drivers may call here + * when they complete AddBa negotiation. + * + * @vif: &struct ieee80211_vif pointer from the add_interface callback + * @addr: station mac address + * @tid: the rx tid + */ +void ieee80211_start_rx_ba_session_offl(struct ieee80211_vif *vif, + const u8 *addr, u16 tid); + +/** + * ieee80211_stop_rx_ba_session_offl - stop a Rx BA session + * + * Some device drivers may offload part of the Rx aggregation flow including + * AddBa/DelBa negotiation but may otherwise be incapable of full Rx + * reordering. + * + * Destroy structures responsible for reordering so device drivers may call here + * when they complete DelBa negotiation. + * + * @vif: &struct ieee80211_vif pointer from the add_interface callback + * @addr: station mac address + * @tid: the rx tid + */ +void ieee80211_stop_rx_ba_session_offl(struct ieee80211_vif *vif, + const u8 *addr, u16 tid); + /* Rate control API */ /** 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); diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index c504e99a5404..ef7a089ac546 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -925,10 +925,17 @@ ieee80211_vif_get_shift(struct ieee80211_vif *vif) return shift; } +struct ieee80211_rx_agg { + u8 addr[ETH_ALEN]; + u16 tid; +}; + enum sdata_queue_type { IEEE80211_SDATA_QUEUE_TYPE_FRAME = 0, IEEE80211_SDATA_QUEUE_AGG_START = 1, IEEE80211_SDATA_QUEUE_AGG_STOP = 2, + IEEE80211_SDATA_QUEUE_RX_AGG_START = 3, + IEEE80211_SDATA_QUEUE_RX_AGG_STOP = 4, }; enum { @@ -1577,6 +1584,10 @@ void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, u16 initiator, u16 reason, bool stop); void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, u16 initiator, u16 reason, bool stop); +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); void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, enum ieee80211_agg_stop_reason reason); void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 2a12b8aa6aad..29be8854a027 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -1140,6 +1140,7 @@ static void ieee80211_iface_work(struct work_struct *work) struct sk_buff *skb; struct sta_info *sta; struct ieee80211_ra_tid *ra_tid; + struct ieee80211_rx_agg *rx_agg; if (!ieee80211_sdata_running(sdata)) return; @@ -1167,6 +1168,34 @@ static void ieee80211_iface_work(struct work_struct *work) ra_tid = (void *)&skb->cb; ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra, ra_tid->tid); + } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) { + rx_agg = (void *)&skb->cb; + mutex_lock(&local->sta_mtx); + sta = sta_info_get_bss(sdata, rx_agg->addr); + if (sta) { + u16 last_seq; + + last_seq = le16_to_cpu( + sta->last_seq_ctrl[rx_agg->tid]); + + __ieee80211_start_rx_ba_session(sta, + 0, 0, + ieee80211_sn_inc(last_seq), + 1, rx_agg->tid, + IEEE80211_MAX_AMPDU_BUF, + false); + } + mutex_unlock(&local->sta_mtx); + } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) { + rx_agg = (void *)&skb->cb; + mutex_lock(&local->sta_mtx); + sta = sta_info_get_bss(sdata, rx_agg->addr); + if (sta) + __ieee80211_stop_rx_ba_session(sta, + rx_agg->tid, + WLAN_BACK_RECIPIENT, 0, + false); + mutex_unlock(&local->sta_mtx); } else if (ieee80211_is_action(mgmt->frame_control) && mgmt->u.action.category == WLAN_CATEGORY_BACK) { int len = skb->len; -- 2.30.2