path: root/drivers/net/wireless/wl12xx/tx.c

/*
 * This file is part of wl1271
 *
 * Copyright (C) 2009 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/etherdevice.h>

#include "wl12xx.h"
#include "debug.h"
#include "io.h"
#include "reg.h"
#include "ps.h"
#include "tx.h"
#include "event.h"

static int wl1271_set_default_wep_key(struct wl1271 *wl,
				      struct wl12xx_vif *wlvif, u8 id)
{
	int ret;
	bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);

	if (is_ap)
		ret = wl12xx_cmd_set_default_wep_key(wl, id,
						     wlvif->ap.bcast_hlid);
	else
		ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);

	if (ret < 0)
		return ret;

	wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
	return 0;
}

static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
{
	int id;

	id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
	if (id >= ACX_TX_DESCRIPTORS)
		return -EBUSY;

	__set_bit(id, wl->tx_frames_map);
	wl->tx_frames[id] = skb;
	wl->tx_frames_cnt++;
	return id;
}

static void wl1271_free_tx_id(struct wl1271 *wl, int id)
{
	if (__test_and_clear_bit(id, wl->tx_frames_map)) {
		if (unlikely(wl->tx_frames_cnt == ACX_TX_DESCRIPTORS))
			clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);

		wl->tx_frames[id] = NULL;
		wl->tx_frames_cnt--;
	}
}

static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
						 struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr;

	/*
	 * add the station to the known list before transmitting the
	 * authentication response. this way it won't get de-authed by FW
	 * when transmitting too soon.
	 */
	hdr = (struct ieee80211_hdr *)(skb->data +
				       sizeof(struct wl1271_tx_hw_descr));
	if (ieee80211_is_auth(hdr->frame_control))
		wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
}

static void wl1271_tx_regulate_link(struct wl1271 *wl,
				    struct wl12xx_vif *wlvif,
				    u8 hlid)
{
	bool fw_ps, single_sta;
	u8 tx_pkts;

	if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
		return;

	fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
	tx_pkts = wl->links[hlid].allocated_pkts;
	single_sta = (wl->active_sta_count == 1);

	/*
	 * if in FW PS and there is enough data in FW we can put the link
	 * into high-level PS and clean out its TX queues.
	 * Make an exception if this is the only connected station. In this
	 * case FW-memory congestion is not a problem.
	 */
	if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
		wl12xx_ps_link_start(wl, wlvif, hlid, true);
}

bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
{
	return wl->dummy_packet == skb;
}

u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
			 struct sk_buff *skb)
{
	struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);

	if (control->control.sta) {
		struct wl1271_station *wl_sta;

		wl_sta = (struct wl1271_station *)
				control->control.sta->drv_priv;
		return wl_sta->hlid;
	}