[deliverable/linux.git] / drivers / net / wireless / wl12xx / wl1271_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 "wl1271.h"
#include "wl1271_io.h"
#include "wl1271_reg.h"
#include "wl1271_ps.h"
#include "wl1271_tx.h"

static int wl1271_tx_id(struct wl1271 *wl, struct sk_buff *skb)
{
	int i;
	for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
		if (wl->tx_frames[i] == NULL) {
			wl->tx_frames[i] = skb;
			return i;
		}

	return -EBUSY;
}

static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra)
{
	struct wl1271_tx_hw_descr *desc;
	u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
	u32 total_blocks;
	int id, ret = -EBUSY;

	/* allocate free identifier for the packet */
	id = wl1271_tx_id(wl, skb);
	if (id < 0)
		return id;

	/* approximate the number of blocks required for this packet
	   in the firmware */
	total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
	total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
	if (total_blocks <= wl->tx_blocks_available) {
		desc = (struct wl1271_tx_hw_descr *)skb_push(
			skb, total_len - skb->len);

		desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
		desc->total_mem_blocks = total_blocks;
		desc->id = id;

		wl->tx_blocks_available -= total_blocks;

		ret = 0;

		wl1271_debug(DEBUG_TX,
			     "tx_allocate: size: %d, blocks: %d, id: %d",
			     total_len, total_blocks, id);
	} else
		wl->tx_frames[id] = NULL;

	return ret;
}

static int wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
			      u32 extra, struct ieee80211_tx_info *control)
{
	struct timespec ts;
	struct wl1271_tx_hw_descr *desc;
	int pad, ac;
	s64 hosttime;
	u16 tx_attr;

	desc = (struct wl1271_tx_hw_descr *) skb->data;

	/* relocate space for security header */
	if (extra) {
		void *framestart = skb->data + sizeof(*desc);
		u16 fc = *(u16 *)(framestart + extra);
		int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
		memmove(framestart, framestart + extra, hdrlen);
	}

	/* configure packet life time */
	getnstimeofday(&ts);
	hosttime = (timespec_to_ns(&ts) >> 10);
	desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
	desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);

	/* configure the tx attributes */
	tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;

	/* queue */
	ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
	desc->tid = wl1271_tx_ac_to_tid(ac);

	desc->aid = TX_HW_DEFAULT_AID;
	desc->reserved = 0;

	/* align the length (and store in terms of words) */
	pad = WL1271_TX_ALIGN(skb->len);
	desc->length = cpu_to_le16(pad >> 2);

	/* calculate number of padding bytes */
	pad = pad - skb->len;
	tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;

	/* if the packets are destined for AP (have a STA entry) send them
	   with AP rate policies, otherwise use default basic rates */
	if (control->control.sta)
		tx_attr |= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;

	desc->tx_attr = cpu_to_le16(tx_attr);

	wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
	return 0;
}

static int wl1271_tx_send_packet(struct wl1271 *wl, struct sk_buff *skb,
				 struct ieee80211_tx_info *control)
{

	struct wl1271_tx_hw_descr *desc;
	int len;

	/* FIXME: This is a workaround for getting non-aligned packets.
	   This happens at least with EAPOL packets from the user space.
	   Our DMA requires packets to be aligned on a 4-byte boundary.
	*/
	if (unlikely((long)skb->data & 0x03)) {
		int offset = (4 - (long)skb->data) & 0x03;
		wl1271_debug(DEBUG_TX, "skb offset %d", offset);

		/* check whether the current skb can be used */
		if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
			unsigned char *src = skb->data;

			/* align the buffer on a 4-byte boundary */
			skb_reserve(skb, offset);
			memmove(skb->data, src, skb->len);
		} else {
			wl1271_info("No handler, fixme!");
			return -EINVAL;
		}
	}

	len = WL1271_TX_ALIGN(skb->len);

	/* perform a fixed address block write with the packet */
	wl1271_write(wl, WL1271_SLV_MEM_DATA, skb->data, len, true);

	/* write packet new counter into the write access register */
	wl->tx_packets_count++;

	desc = (struct wl1271_tx_hw_descr *) skb->data;
	wl1271_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u (%u words)",
		     desc->id, skb, len, desc->length);

	return 0;
}

/* caller must hold wl->mutex */
static int wl1271_tx_frame(struct wl1271 *wl, struct sk_buff *skb)
{
	struct ieee80211_tx_info *info;
	u32 extra = 0;
	int ret = 0;
	u8 idx;

	if (!skb)
		return -EINVAL;

	info = IEEE80211_SKB_CB(skb);

	if (info->control.hw_key &&
	    info->control.hw_key->alg == ALG_TKIP)
		extra = WL1271_TKIP_IV_SPACE;

	if (info->control.hw_key) {
		idx = info->control.hw_key->hw_key_idx;

		/* FIXME: do we have to do this if we're not using WEP? */
		if (unlikely(wl->default_key != idx)) {
			ret = wl1271_cmd_set_default_wep_key(wl, idx);
			if (ret < 0)
				return ret;
			wl->default_key = idx;
		}
	}

	ret = wl1271_tx_allocate(wl, skb, extra);
	if (ret < 0)
		return ret;

	ret = wl1271_tx_fill_hdr(wl, skb, extra, info);
	if (ret < 0)
		return ret;

	ret = wl1271_tx_send_packet(wl, skb, info);
	if (ret < 0)
		return ret;

	return ret;
}

static u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
{
	struct ieee80211_supported_band *band;
	u32 enabled_rates = 0;
	int bit;

	band = wl->hw->wiphy->bands[wl->band];
	for (bit = 0; bit < band->n_bitrates; bit++) {
		if (rate_set & 0x1)
			enabled_rates |= band->bitrates[bit].hw_value;
		rate_set >>= 1;
	}

	return enabled_rates;
}

void wl1271_tx_work(struct work_struct *work)
{
	struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
	struct sk_buff *skb;
	bool woken_up = false;
	u32 sta_rates = 0;
	u32 prev_tx_packets_count;
	int ret;

	/* check if the rates supported by the AP have changed */
	if (unlikely(test_and_clear_bit(WL1271_FLAG_STA_RATES_CHANGED,
					&wl->flags))) {
		unsigned long flags;
		spin_lock_irqsave(&wl->wl_lock, flags);
		sta_rates = wl->sta_rate_set;
		spin_unlock_irqrestore(&wl->wl_lock, flags);
	}

	mutex_lock(&wl->mutex);

	if (unlikely(wl->state == WL1271_STATE_OFF))
		goto out;

	prev_tx_packets_count = wl->tx_packets_count;

	/* if rates have changed, re-configure the rate policy */
	if (unlikely(sta_rates)) {
		wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
		wl1271_acx_rate_policies(wl);
	}

	while ((skb = skb_dequeue(&wl->tx_queue))) {
		if (!woken_up) {
			ret = wl1271_ps_elp_wakeup(wl, false);
			if (ret < 0)
				goto out_ack;
			woken_up = true;
		}

		ret = wl1271_tx_frame(wl, skb);
		if (ret == -EBUSY) {
			/* firmware buffer is full, lets stop transmitting. */
			skb_queue_head(&wl->tx_queue, skb);
			goto out_ack;
		} else if (ret < 0) {
			dev_kfree_skb(skb);
			goto out_ack;
		}
	}

out_ack:
	/* interrupt the firmware with the new packets */
	if (prev_tx_packets_count != wl->tx_packets_count)
		wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);

out:
	if (woken_up)
		wl1271_ps_elp_sleep(wl);

	mutex_unlock(&wl->mutex);
}

static void wl1271_tx_complete_packet(struct wl1271 *wl,
				      struct wl1271_tx_hw_res_descr *result)
{
	struct ieee80211_tx_info *info;
	struct sk_buff *skb;
	int id = result->id;
	int rate = -1;
	u8 retries = 0;

	/* check for id legality */
	if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
		wl1271_warning("TX result illegal id: %d", id);
		return;
	}

	skb = wl->tx_frames[id];
	info = IEEE80211_SKB_CB(skb);

	/* update the TX status info */
	if (result->status == TX_SUCCESS) {
		if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
			info->flags |= IEEE80211_TX_STAT_ACK;
		rate = wl1271_rate_to_idx(wl, result->rate_class_index);
		retries = result->ack_failures;
	} else if (result->status == TX_RETRY_EXCEEDED) {
		wl->stats.excessive_retries++;
		retries = result->ack_failures;
	}

	info->status.rates[0].idx = rate;
	info->status.rates[0].count = retries;
	info->status.rates[0].flags = 0;
	info->status.ack_signal = -1;

	wl->stats.retry_count += result->ack_failures;

	/* update security sequence number */
	wl->tx_security_seq += (result->lsb_security_sequence_number -
				wl->tx_security_last_seq);
	wl->tx_security_last_seq = result->lsb_security_sequence_number;

	/* remove private header from packet */
	skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));

	/* remove TKIP header space if present */
	if (info->control.hw_key &&
	    info->control.hw_key->alg == ALG_TKIP) {
		int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
		memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
		skb_pull(skb, WL1271_TKIP_IV_SPACE);
	}

	wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
		     " status 0x%x",
		     result->id, skb, result->ack_failures,
		     result->rate_class_index, result->status);

	/* return the packet to the stack */
	ieee80211_tx_status(wl->hw, skb);
	wl->tx_frames[result->id] = NULL;
}

/* Called upon reception of a TX complete interrupt */
void wl1271_tx_complete(struct wl1271 *wl)
{
	struct wl1271_acx_mem_map *memmap =
		(struct wl1271_acx_mem_map *)wl->target_mem_map;
	u32 count, fw_counter;
	u32 i;

	/* read the tx results from the chipset */
	wl1271_read(wl, le32_to_cpu(memmap->tx_result),
		    wl->tx_res_if, sizeof(*wl->tx_res_if), false);
	fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);

	/* write host counter to chipset (to ack) */
	wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
		       offsetof(struct wl1271_tx_hw_res_if,
				tx_result_host_counter), fw_counter);

	count = fw_counter - wl->tx_results_count;
	wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);

	/* verify that the result buffer is not getting overrun */
	if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
		wl1271_warning("TX result overflow from chipset: %d", count);

	/* process the results */
	for (i = 0; i < count; i++) {
		struct wl1271_tx_hw_res_descr *result;
		u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;

		/* process the packet */
		result =  &(wl->tx_res_if->tx_results_queue[offset]);
		wl1271_tx_complete_packet(wl, result);

		wl->tx_results_count++;
	}

	if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
	    skb_queue_len(&wl->tx_queue) <= WL1271_TX_QUEUE_LOW_WATERMARK) {
		unsigned long flags;

		/* firmware buffer has space, restart queues */
		wl1271_debug(DEBUG_TX, "tx_complete: waking queues");
		spin_lock_irqsave(&wl->wl_lock, flags);
		ieee80211_wake_queues(wl->hw);
		clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
		spin_unlock_irqrestore(&wl->wl_lock, flags);
		ieee80211_queue_work(wl->hw, &wl->tx_work);
	}
}

/* caller must hold wl->mutex */
void wl1271_tx_flush(struct wl1271 *wl)
{
	int i;
	struct sk_buff *skb;
	struct ieee80211_tx_info *info;

	/* TX failure */
/* 	control->flags = 0; FIXME */

	while ((skb = skb_dequeue(&wl->tx_queue))) {
		info = IEEE80211_SKB_CB(skb);

		wl1271_debug(DEBUG_TX, "flushing skb 0x%p", skb);

		if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) {
			kfree_skb(skb);
			continue;
		}

		ieee80211_tx_status(wl->hw, skb);
	}

	for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
		if (wl->tx_frames[i] != NULL) {
			skb = wl->tx_frames[i];
			info = IEEE80211_SKB_CB(skb);

			if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) {
				kfree_skb(skb);
				continue;
			}

			ieee80211_tx_status(wl->hw, skb);
			wl->tx_frames[i] = NULL;
		}
}
Commit	Line	Data
f5fc0f86 LC	1	/*
	2	* This file is part of wl1271
	3	*
	4	* Copyright (C) 2009 Nokia Corporation
	5	*
	6	* Contact: Luciano Coelho <luciano.coelho@nokia.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
	24	#include <linux/kernel.h>
	25	#include <linux/module.h>
	26
	27	#include "wl1271.h"
7b048c52	28	#include "wl1271_io.h"
f5fc0f86 LC	29	#include "wl1271_reg.h"
	30	#include "wl1271_ps.h"
	31	#include "wl1271_tx.h"
	32
	33	static int wl1271_tx_id(struct wl1271 wl, struct sk_buff skb)
	34	{
	35	int i;
be7078c2	36	for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
f5fc0f86 LC	37	if (wl->tx_frames[i] == NULL) {
	38	wl->tx_frames[i] = skb;
	39	return i;
	40	}
	41
	42	return -EBUSY;
	43	}
	44
	45	static int wl1271_tx_allocate(struct wl1271 wl, struct sk_buff skb, u32 extra)
	46	{
	47	struct wl1271_tx_hw_descr *desc;
	48	u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
5c9417f1	49	u32 total_blocks;
f5fc0f86 LC	50	int id, ret = -EBUSY;
	51
	52	/* allocate free identifier for the packet */
	53	id = wl1271_tx_id(wl, skb);
	54	if (id < 0)
	55	return id;
	56
	57	/* approximate the number of blocks required for this packet
	58	in the firmware */
5c9417f1 JO	59	total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
5c9417f1 JO	60	total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
f5fc0f86 LC	61	if (total_blocks <= wl->tx_blocks_available) {
	62	desc = (struct wl1271_tx_hw_descr *)skb_push(
	63	skb, total_len - skb->len);
	64
	65	desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
	66	desc->total_mem_blocks = total_blocks;
	67	desc->id = id;
	68
	69	wl->tx_blocks_available -= total_blocks;
	70
	71	ret = 0;
	72
	73	wl1271_debug(DEBUG_TX,
	74	"tx_allocate: size: %d, blocks: %d, id: %d",
	75	total_len, total_blocks, id);
	76	} else
	77	wl->tx_frames[id] = NULL;
	78
	79	return ret;
	80	}
	81
	82	static int wl1271_tx_fill_hdr(struct wl1271 wl, struct sk_buff skb,
	83	u32 extra, struct ieee80211_tx_info *control)
	84	{
ac5e1e39	85	struct timespec ts;
f5fc0f86	86	struct wl1271_tx_hw_descr *desc;
c6999d83	87	int pad, ac;
ac5e1e39	88	s64 hosttime;
d0f63b20	89	u16 tx_attr;
f5fc0f86 LC	90
	91	desc = (struct wl1271_tx_hw_descr *) skb->data;
	92
1e2b7976 JO	93	/* relocate space for security header */
	94	if (extra) {
	95	void framestart = skb->data + sizeof(desc);
	96	u16 fc = (u16 )(framestart + extra);
d0f63b20	97	int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
1e2b7976 JO	98	memmove(framestart, framestart + extra, hdrlen);
	99	}
	100
f5fc0f86	101	/* configure packet life time */
ac5e1e39 JO	102	getnstimeofday(&ts);
	103	hosttime = (timespec_to_ns(&ts) >> 10);
	104	desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
d0f63b20	105	desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
f5fc0f86 LC	106
f5fc0f86 LC	107	/* configure the tx attributes */
d0f63b20	108	tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
c6999d83 KV	109
	110	/* queue */
	111	ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
	112	desc->tid = wl1271_tx_ac_to_tid(ac);
	113
f5fc0f86 LC	114	desc->aid = TX_HW_DEFAULT_AID;
	115	desc->reserved = 0;
	116
	117	/* align the length (and store in terms of words) */
	118	pad = WL1271_TX_ALIGN(skb->len);
d0f63b20	119	desc->length = cpu_to_le16(pad >> 2);
f5fc0f86 LC	120
	121	/* calculate number of padding bytes */
	122	pad = pad - skb->len;
d0f63b20 LC	123	tx_attr \|= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
d0f63b20 LC	124
830fb67b JO	125	/* if the packets are destined for AP (have a STA entry) send them
	126	with AP rate policies, otherwise use default basic rates */
	127	if (control->control.sta)
	128	tx_attr \|= ACX_TX_AP_FULL_RATE << TX_HW_ATTR_OFST_RATE_POLICY;
	129
d0f63b20	130	desc->tx_attr = cpu_to_le16(tx_attr);
f5fc0f86 LC	131
	132	wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
	133	return 0;
	134	}
	135
	136	static int wl1271_tx_send_packet(struct wl1271 wl, struct sk_buff skb,
	137	struct ieee80211_tx_info *control)
	138	{
	139
	140	struct wl1271_tx_hw_descr *desc;
	141	int len;
	142
	143	/* FIXME: This is a workaround for getting non-aligned packets.
	144	This happens at least with EAPOL packets from the user space.
	145	Our DMA requires packets to be aligned on a 4-byte boundary.
	146	*/
	147	if (unlikely((long)skb->data & 0x03)) {
	148	int offset = (4 - (long)skb->data) & 0x03;
	149	wl1271_debug(DEBUG_TX, "skb offset %d", offset);
	150
	151	/* check whether the current skb can be used */
	152	if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
	153	unsigned char *src = skb->data;
	154
	155	/* align the buffer on a 4-byte boundary */
	156	skb_reserve(skb, offset);
	157	memmove(skb->data, src, skb->len);
	158	} else {
	159	wl1271_info("No handler, fixme!");
	160	return -EINVAL;
	161	}
	162	}
	163
	164	len = WL1271_TX_ALIGN(skb->len);
	165
	166	/* perform a fixed address block write with the packet */
7b048c52	167	wl1271_write(wl, WL1271_SLV_MEM_DATA, skb->data, len, true);
f5fc0f86 LC	168
	169	/* write packet new counter into the write access register */
	170	wl->tx_packets_count++;
f5fc0f86 LC	171
	172	desc = (struct wl1271_tx_hw_descr *) skb->data;
	173	wl1271_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u (%u words)",
	174	desc->id, skb, len, desc->length);
	175
	176	return 0;
	177	}
	178
	179	/* caller must hold wl->mutex */
	180	static int wl1271_tx_frame(struct wl1271 wl, struct sk_buff skb)
	181	{
	182	struct ieee80211_tx_info *info;
	183	u32 extra = 0;
	184	int ret = 0;
	185	u8 idx;
	186
	187	if (!skb)
	188	return -EINVAL;
	189
	190	info = IEEE80211_SKB_CB(skb);
	191
	192	if (info->control.hw_key &&
	193	info->control.hw_key->alg == ALG_TKIP)
	194	extra = WL1271_TKIP_IV_SPACE;
	195
	196	if (info->control.hw_key) {
	197	idx = info->control.hw_key->hw_key_idx;
	198
	199	/* FIXME: do we have to do this if we're not using WEP? */
	200	if (unlikely(wl->default_key != idx)) {
	201	ret = wl1271_cmd_set_default_wep_key(wl, idx);
	202	if (ret < 0)
	203	return ret;
ee444cf0	204	wl->default_key = idx;
f5fc0f86 LC	205	}
	206	}
	207
	208	ret = wl1271_tx_allocate(wl, skb, extra);
	209	if (ret < 0)
	210	return ret;
	211
	212	ret = wl1271_tx_fill_hdr(wl, skb, extra, info);
	213	if (ret < 0)
	214	return ret;
	215
	216	ret = wl1271_tx_send_packet(wl, skb, info);
	217	if (ret < 0)
	218	return ret;
	219
	220	return ret;
	221	}
	222
830fb67b JO	223	static u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
	224	{
	225	struct ieee80211_supported_band *band;
	226	u32 enabled_rates = 0;
	227	int bit;
	228
	229	band = wl->hw->wiphy->bands[wl->band];
	230	for (bit = 0; bit < band->n_bitrates; bit++) {
	231	if (rate_set & 0x1)
	232	enabled_rates \|= band->bitrates[bit].hw_value;
	233	rate_set >>= 1;
	234	}
	235
	236	return enabled_rates;
	237	}
	238
f5fc0f86 LC	239	void wl1271_tx_work(struct work_struct *work)
	240	{
	241	struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
	242	struct sk_buff *skb;
	243	bool woken_up = false;
830fb67b	244	u32 sta_rates = 0;
ffb591cd	245	u32 prev_tx_packets_count;
f5fc0f86 LC	246	int ret;
f5fc0f86 LC	247
830fb67b JO	248	/* check if the rates supported by the AP have changed */
	249	if (unlikely(test_and_clear_bit(WL1271_FLAG_STA_RATES_CHANGED,
	250	&wl->flags))) {
	251	unsigned long flags;
	252	spin_lock_irqsave(&wl->wl_lock, flags);
	253	sta_rates = wl->sta_rate_set;
	254	spin_unlock_irqrestore(&wl->wl_lock, flags);
	255	}
	256
f5fc0f86 LC	257	mutex_lock(&wl->mutex);
	258
	259	if (unlikely(wl->state == WL1271_STATE_OFF))
	260	goto out;
	261
ffb591cd JO	262	prev_tx_packets_count = wl->tx_packets_count;
ffb591cd JO	263
830fb67b JO	264	/* if rates have changed, re-configure the rate policy */
	265	if (unlikely(sta_rates)) {
	266	wl->rate_set = wl1271_tx_enabled_rates_get(wl, sta_rates);
	267	wl1271_acx_rate_policies(wl);
	268	}
	269
f5fc0f86 LC	270	while ((skb = skb_dequeue(&wl->tx_queue))) {
	271	if (!woken_up) {
	272	ret = wl1271_ps_elp_wakeup(wl, false);
	273	if (ret < 0)
ffb591cd	274	goto out_ack;
f5fc0f86 LC	275	woken_up = true;
	276	}
	277
	278	ret = wl1271_tx_frame(wl, skb);
	279	if (ret == -EBUSY) {
06f7bc7d	280	/* firmware buffer is full, lets stop transmitting. */
f5fc0f86	281	skb_queue_head(&wl->tx_queue, skb);
ffb591cd	282	goto out_ack;
f5fc0f86 LC	283	} else if (ret < 0) {
f5fc0f86 LC	284	dev_kfree_skb(skb);
ffb591cd	285	goto out_ack;
f5fc0f86 LC	286	}
	287	}
	288
ffb591cd JO	289	out_ack:
	290	/* interrupt the firmware with the new packets */
	291	if (prev_tx_packets_count != wl->tx_packets_count)
	292	wl1271_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
	293
f5fc0f86 LC	294	out:
	295	if (woken_up)
	296	wl1271_ps_elp_sleep(wl);
	297
	298	mutex_unlock(&wl->mutex);
	299	}
	300
	301	static void wl1271_tx_complete_packet(struct wl1271 *wl,
	302	struct wl1271_tx_hw_res_descr *result)
	303	{
f5fc0f86 LC	304	struct ieee80211_tx_info *info;
f5fc0f86 LC	305	struct sk_buff *skb;
f5fc0f86	306	int id = result->id;
31627dc5 JO	307	int rate = -1;
31627dc5 JO	308	u8 retries = 0;
f5fc0f86 LC	309
f5fc0f86 LC	310	/* check for id legality */
ffb591cd	311	if (unlikely(id >= ACX_TX_DESCRIPTORS \|\| wl->tx_frames[id] == NULL)) {
f5fc0f86 LC	312	wl1271_warning("TX result illegal id: %d", id);
	313	return;
	314	}
	315
	316	skb = wl->tx_frames[id];
	317	info = IEEE80211_SKB_CB(skb);
	318
31627dc5 JO	319	/* update the TX status info */
	320	if (result->status == TX_SUCCESS) {
	321	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
f5fc0f86	322	info->flags \|= IEEE80211_TX_STAT_ACK;
31627dc5 JO	323	rate = wl1271_rate_to_idx(wl, result->rate_class_index);
	324	retries = result->ack_failures;
	325	} else if (result->status == TX_RETRY_EXCEEDED) {
	326	wl->stats.excessive_retries++;
	327	retries = result->ack_failures;
f5fc0f86 LC	328	}
f5fc0f86 LC	329
31627dc5 JO	330	info->status.rates[0].idx = rate;
	331	info->status.rates[0].count = retries;
	332	info->status.rates[0].flags = 0;
	333	info->status.ack_signal = -1;
	334
f5fc0f86 LC	335	wl->stats.retry_count += result->ack_failures;
f5fc0f86 LC	336
ac4e4ce5	337	/* update security sequence number */
04e36fc5 JO	338	wl->tx_security_seq += (result->lsb_security_sequence_number -
04e36fc5 JO	339	wl->tx_security_last_seq);
ac4e4ce5 JO	340	wl->tx_security_last_seq = result->lsb_security_sequence_number;
ac4e4ce5 JO	341
1e2b7976 JO	342	/* remove private header from packet */
	343	skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
	344
	345	/* remove TKIP header space if present */
f5fc0f86	346	if (info->control.hw_key &&
1e2b7976 JO	347	info->control.hw_key->alg == ALG_TKIP) {
	348	int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
	349	memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
	350	skb_pull(skb, WL1271_TKIP_IV_SPACE);
	351	}
f5fc0f86 LC	352
	353	wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
	354	" status 0x%x",
	355	result->id, skb, result->ack_failures,
	356	result->rate_class_index, result->status);
	357
f5fc0f86 LC	358	/* return the packet to the stack */
	359	ieee80211_tx_status(wl->hw, skb);
	360	wl->tx_frames[result->id] = NULL;
	361	}
	362
	363	/* Called upon reception of a TX complete interrupt */
ffb591cd	364	void wl1271_tx_complete(struct wl1271 *wl)
f5fc0f86 LC	365	{
	366	struct wl1271_acx_mem_map *memmap =
	367	(struct wl1271_acx_mem_map *)wl->target_mem_map;
ffb591cd	368	u32 count, fw_counter;
f5fc0f86 LC	369	u32 i;
f5fc0f86 LC	370
f5fc0f86	371	/* read the tx results from the chipset */
7b048c52 TP	372	wl1271_read(wl, le32_to_cpu(memmap->tx_result),
7b048c52 TP	373	wl->tx_res_if, sizeof(*wl->tx_res_if), false);
ffb591cd JO	374	fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
	375
	376	/* write host counter to chipset (to ack) */
	377	wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
	378	offsetof(struct wl1271_tx_hw_res_if,
	379	tx_result_host_counter), fw_counter);
	380
	381	count = fw_counter - wl->tx_results_count;
06f7bc7d	382	wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
f5fc0f86 LC	383
f5fc0f86 LC	384	/* verify that the result buffer is not getting overrun */
ffb591cd	385	if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
f5fc0f86	386	wl1271_warning("TX result overflow from chipset: %d", count);
f5fc0f86 LC	387
	388	/* process the results */
	389	for (i = 0; i < count; i++) {
	390	struct wl1271_tx_hw_res_descr *result;
	391	u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
	392
	393	/* process the packet */
	394	result = &(wl->tx_res_if->tx_results_queue[offset]);
	395	wl1271_tx_complete_packet(wl, result);
	396
	397	wl->tx_results_count++;
	398	}
06f7bc7d JO	399
	400	if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
	401	skb_queue_len(&wl->tx_queue) <= WL1271_TX_QUEUE_LOW_WATERMARK) {
	402	unsigned long flags;
	403
	404	/* firmware buffer has space, restart queues */
	405	wl1271_debug(DEBUG_TX, "tx_complete: waking queues");
	406	spin_lock_irqsave(&wl->wl_lock, flags);
	407	ieee80211_wake_queues(wl->hw);
	408	clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
	409	spin_unlock_irqrestore(&wl->wl_lock, flags);
	410	ieee80211_queue_work(wl->hw, &wl->tx_work);
	411	}
f5fc0f86 LC	412	}
	413
	414	/* caller must hold wl->mutex */
	415	void wl1271_tx_flush(struct wl1271 *wl)
	416	{
	417	int i;
	418	struct sk_buff *skb;
	419	struct ieee80211_tx_info *info;
	420
	421	/* TX failure */
	422	/* control->flags = 0; FIXME */
	423
	424	while ((skb = skb_dequeue(&wl->tx_queue))) {
	425	info = IEEE80211_SKB_CB(skb);
	426
	427	wl1271_debug(DEBUG_TX, "flushing skb 0x%p", skb);
	428
cbf7f305 JO	429	if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) {
	430	kfree_skb(skb);
	431	continue;
	432	}
f5fc0f86 LC	433
	434	ieee80211_tx_status(wl->hw, skb);
	435	}
	436
be7078c2	437	for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
f5fc0f86 LC	438	if (wl->tx_frames[i] != NULL) {
	439	skb = wl->tx_frames[i];
	440	info = IEEE80211_SKB_CB(skb);
	441
cbf7f305 JO	442	if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) {
cbf7f305 JO	443	kfree_skb(skb);
f5fc0f86	444	continue;
cbf7f305	445	}
f5fc0f86 LC	446
	447	ieee80211_tx_status(wl->hw, skb);
	448	wl->tx_frames[i] = NULL;
	449	}
	450	}