mac80211: move some HT code out of mlme.c

Some of the HT code in mlme.c is misplaced:
 * constants/definitions belong to the ieee80211.h header
 * code being used in other modes as well shouldn't be there

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 328 insertions, 0 deletions

diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
new file mode 100644
index 000000000000..5ccf1bc17466
--- /dev/null
+++ b/net/mac80211/ht.c
@@ -0,0 +1,328 @@
+/*
+ * HT handling
+ *
+ * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
+ * Copyright 2004, Instant802 Networks, Inc.
+ * Copyright 2005, Devicescape Software, Inc.
+ * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
+ * Copyright 2007-2008, Intel Corporation
+ *
+ * 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
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/ieee80211.h>
+#include <net/wireless.h>
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "sta_info.h"
+
+int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
+                                   struct ieee80211_ht_info *ht_info)
+{
+
+        if (ht_info == NULL)
+                return -EINVAL;
+
+        memset(ht_info, 0, sizeof(*ht_info));
+
+        if (ht_cap_ie) {
+                u8 ampdu_info = ht_cap_ie->ampdu_params_info;
+
+                ht_info->ht_supported = 1;
+                ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
+                ht_info->ampdu_factor =
+                        ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
+                ht_info->ampdu_density =
+                        (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
+                memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
+        } else
+                ht_info->ht_supported = 0;
+
+        return 0;
+}
+
+int ieee80211_ht_addt_info_ie_to_ht_bss_info(
+                        struct ieee80211_ht_addt_info *ht_add_info_ie,
+                        struct ieee80211_ht_bss_info *bss_info)
+{
+        if (bss_info == NULL)
+                return -EINVAL;
+
+        memset(bss_info, 0, sizeof(*bss_info));
+
+        if (ht_add_info_ie) {
+                u16 op_mode;
+                op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
+
+                bss_info->primary_channel = ht_add_info_ie->control_chan;
+                bss_info->bss_cap = ht_add_info_ie->ht_param;
+                bss_info->bss_op_mode = (u8)(op_mode & 0xff);
+        }
+
+        return 0;
+}
+
+void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
+                                u16 tid, u8 dialog_token, u16 start_seq_num,
+                                u16 agg_size, u16 timeout)
+{
+        struct ieee80211_local *local = sdata->local;
+        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+        struct sk_buff *skb;
+        struct ieee80211_mgmt *mgmt;
+        u16 capab;
+
+        skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
+
+        if (!skb) {
+                printk(KERN_ERR "%s: failed to allocate buffer "
+                                "for addba request frame\n", sdata->dev->name);
+                return;
+        }
+        skb_reserve(skb, local->hw.extra_tx_headroom);
+        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
+        memset(mgmt, 0, 24);
+        memcpy(mgmt->da, da, ETH_ALEN);
+        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
+        if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
+                memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
+        else
+                memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
+
+        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+                                          IEEE80211_STYPE_ACTION);
+
+        skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
+
+        mgmt->u.action.category = WLAN_CATEGORY_BACK;
+        mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
+
+        mgmt->u.action.u.addba_req.dialog_token = dialog_token;
+        capab = (u16)(1 << 1);          /* bit 1 aggregation policy */
+        capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
+        capab |= (u16)(agg_size << 6);  /* bit 15:6 max size of aggergation */
+
+        mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
+
+        mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
+        mgmt->u.action.u.addba_req.start_seq_num =
+                                        cpu_to_le16(start_seq_num << 4);
+
+        ieee80211_sta_tx(sdata, skb, 0);
+}
+
+void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
+                          u16 initiator, u16 reason_code)
+{
+        struct ieee80211_local *local = sdata->local;
+        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+        struct sk_buff *skb;
+        struct ieee80211_mgmt *mgmt;
+        u16 params;
+
+        skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
+
+        if (!skb) {
+                printk(KERN_ERR "%s: failed to allocate buffer "
+                                        "for delba frame\n", sdata->dev->name);
+                return;
+        }
+
+        skb_reserve(skb, local->hw.extra_tx_headroom);
+        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
+        memset(mgmt, 0, 24);
+        memcpy(mgmt->da, da, ETH_ALEN);
+        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
+        if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
+                memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
+        else
+                memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
+        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+                                          IEEE80211_STYPE_ACTION);
+
+        skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
+
+        mgmt->u.action.category = WLAN_CATEGORY_BACK;
+        mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
+        params = (u16)(initiator << 11);        /* bit 11 initiator */
+        params |= (u16)(tid << 12);             /* bit 15:12 TID number */
+
+        mgmt->u.action.u.delba.params = cpu_to_le16(params);
+        mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
+
+        ieee80211_sta_tx(sdata, skb, 0);
+}
+
+void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
+{
+        struct ieee80211_local *local = sdata->local;
+        struct sk_buff *skb;
+        struct ieee80211_bar *bar;
+        u16 bar_control = 0;
+
+        skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
+        if (!skb) {
+                printk(KERN_ERR "%s: failed to allocate buffer for "
+                        "bar frame\n", sdata->dev->name);
+                return;
+        }
+        skb_reserve(skb, local->hw.extra_tx_headroom);
+        bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
+        memset(bar, 0, sizeof(*bar));
+        bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
+                                         IEEE80211_STYPE_BACK_REQ);
+        memcpy(bar->ra, ra, ETH_ALEN);
+        memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
+        bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
+        bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
+        bar_control |= (u16)(tid << 12);
+        bar->control = cpu_to_le16(bar_control);
+        bar->start_seq_num = cpu_to_le16(ssn);
+
+        ieee80211_sta_tx(sdata, skb, 0);
+}
+
+void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
+                                        u16 initiator, u16 reason)
+{
+        struct ieee80211_local *local = sdata->local;
+        struct ieee80211_hw *hw = &local->hw;
+        struct sta_info *sta;
+        int ret, i;
+        DECLARE_MAC_BUF(mac);
+
+        rcu_read_lock();
+
+        sta = sta_info_get(local, ra);
+        if (!sta) {
+                rcu_read_unlock();
+                return;
+        }
+
+        /* check if TID is in operational state */
+        spin_lock_bh(&sta->lock);
+        if (sta->ampdu_mlme.tid_state_rx[tid]
+                                != HT_AGG_STATE_OPERATIONAL) {
+                spin_unlock_bh(&sta->lock);
+                rcu_read_unlock();
+                return;
+        }
+        sta->ampdu_mlme.tid_state_rx[tid] =
+                HT_AGG_STATE_REQ_STOP_BA_MSK |
+                (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
+        spin_unlock_bh(&sta->lock);
+
+        /* stop HW Rx aggregation. ampdu_action existence
+         * already verified in session init so we add the BUG_ON */
+        BUG_ON(!local->ops->ampdu_action);
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+        printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
+                                print_mac(mac, ra), tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
+        ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
+                                        ra, tid, NULL);
+        if (ret)
+                printk(KERN_DEBUG "HW problem - can not stop rx "
+                                "aggregation for tid %d\n", tid);
+
+        /* shutdown timer has not expired */
+        if (initiator != WLAN_BACK_TIMER)
+                del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
+
+        /* check if this is a self generated aggregation halt */
+        if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
+                ieee80211_send_delba(sdata, ra, tid, 0, reason);
+
+        /* free the reordering buffer */
+        for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
+                if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
+                        /* release the reordered frames */
+                        dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
+                        sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
+                        sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
+                }
+        }
+        /* free resources */
+        kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
+        kfree(sta->ampdu_mlme.tid_rx[tid]);
+        sta->ampdu_mlme.tid_rx[tid] = NULL;
+        sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
+
+        rcu_read_unlock();
+}
+
+
+/*
+ * After sending add Block Ack request we activated a timer until
+ * add Block Ack response will arrive from the recipient.
+ * If this timer expires sta_addba_resp_timer_expired will be executed.
+ */
+void sta_addba_resp_timer_expired(unsigned long data)
+{
+        /* not an elegant detour, but there is no choice as the timer passes
+         * only one argument, and both sta_info and TID are needed, so init
+         * flow in sta_info_create gives the TID as data, while the timer_to_id
+         * array gives the sta through container_of */
+        u16 tid = *(u8 *)data;
+        struct sta_info *temp_sta = container_of((void *)data,
+                struct sta_info, timer_to_tid[tid]);
+
+        struct ieee80211_local *local = temp_sta->local;
+        struct ieee80211_hw *hw = &local->hw;
+        struct sta_info *sta;
+        u8 *state;
+
+        rcu_read_lock();
+
+        sta = sta_info_get(local, temp_sta->addr);
+        if (!sta) {
+                rcu_read_unlock();
+                return;
+        }
+
+        state = &sta->ampdu_mlme.tid_state_tx[tid];
+        /* check if the TID waits for addBA response */
+        spin_lock_bh(&sta->lock);
+        if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
+                spin_unlock_bh(&sta->lock);
+                *state = HT_AGG_STATE_IDLE;
+#ifdef CONFIG_MAC80211_HT_DEBUG
+                printk(KERN_DEBUG "timer expired on tid %d but we are not "
+                                "expecting addBA response there", tid);
+#endif
+                goto timer_expired_exit;
+        }
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+        printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
+#endif
+
+        /* go through the state check in stop_BA_session */
+        *state = HT_AGG_STATE_OPERATIONAL;
+        spin_unlock_bh(&sta->lock);
+        ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
+                                     WLAN_BACK_INITIATOR);
+
+timer_expired_exit:
+        rcu_read_unlock();
+}
+
+void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
+{
+        struct ieee80211_local *local = sdata->local;
+        int i;
+
+        for (i = 0; i <  STA_TID_NUM; i++) {
+                ieee80211_stop_tx_ba_session(&local->hw, addr, i,
+                                             WLAN_BACK_INITIATOR);
+                ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
+                                                 WLAN_BACK_RECIPIENT,
+                                                 WLAN_REASON_QSTA_LEAVE_QBSS);
+        }
+}
+