[linux-2.6-block.git] / drivers / net / wireless / wl1251 / tx.c

/*
 * This file is part of wl1251
 *
 * Copyright (c) 1998-2007 Texas Instruments Incorporated
 * Copyright (C) 2008 Nokia 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.
 *
 * 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 "wl1251.h"
#include "reg.h"
#include "tx.h"
#include "ps.h"
#include "io.h"

static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count)
{
	int used, data_in_count;

	data_in_count = wl->data_in_count;

	if (data_in_count < data_out_count)
		/* data_in_count has wrapped */
		data_in_count += TX_STATUS_DATA_OUT_COUNT_MASK + 1;

	used = data_in_count - data_out_count;

	WARN_ON(used < 0);
	WARN_ON(used > DP_TX_PACKET_RING_CHUNK_NUM);

	if (used >= DP_TX_PACKET_RING_CHUNK_NUM)
		return true;
	else
		return false;
}

static int wl1251_tx_path_status(struct wl1251 *wl)
{
	u32 status, addr, data_out_count;
	bool busy;

	addr = wl->data_path->tx_control_addr;
	status = wl1251_mem_read32(wl, addr);
	data_out_count = status & TX_STATUS_DATA_OUT_COUNT_MASK;
	busy = wl1251_tx_double_buffer_busy(wl, data_out_count);

	if (busy)
		return -EBUSY;

	return 0;
}

static int wl1251_tx_id(struct wl1251 *wl, struct sk_buff *skb)
{
	int i;

	for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
		if (wl->tx_frames[i] == NULL) {
			wl->tx_frames[i] = skb;
			return i;
		}

	return -EBUSY;
}

static void wl1251_tx_control(struct tx_double_buffer_desc *tx_hdr,
			      struct ieee80211_tx_info *control, u16 fc)
{
	*(u16 *)&tx_hdr->control = 0;

	tx_hdr->control.rate_policy = 0;

	/* 802.11 packets */
	tx_hdr->control.packet_type = 0;

	if (control->flags & IEEE80211_TX_CTL_NO_ACK)
		tx_hdr->control.ack_policy = 1;

	tx_hdr->control.tx_complete = 1;

	if ((fc & IEEE80211_FTYPE_DATA) &&
	    ((fc & IEEE80211_STYPE_QOS_DATA) ||
	     (fc & IEEE80211_STYPE_QOS_NULLFUNC)))
		tx_hdr->control.qos = 1;
}

/* RSN + MIC = 8 + 8 = 16 bytes (worst case - AES). */
#define MAX_MSDU_SECURITY_LENGTH      16
#define MAX_MPDU_SECURITY_LENGTH      16
#define WLAN_QOS_HDR_LEN              26
#define MAX_MPDU_HEADER_AND_SECURITY  (MAX_MPDU_SECURITY_LENGTH + \
				       WLAN_QOS_HDR_LEN)
#define HW_BLOCK_SIZE                 252
static void wl1251_tx_frag_block_num(struct tx_double_buffer_desc *tx_hdr)
{
	u16 payload_len, frag_threshold, mem_blocks;
	u16 num_mpdus, mem_blocks_per_frag;

	frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
	tx_hdr->frag_threshold = cpu_to_le16(frag_threshold);

	payload_len = le16_to_cpu(tx_hdr->length) + MAX_MSDU_SECURITY_LENGTH;

	if (payload_len > frag_threshold) {
		mem_blocks_per_frag =
			((frag_threshold + MAX_MPDU_HEADER_AND_SECURITY) /
			 HW_BLOCK_SIZE) + 1;
		num_mpdus = payload_len / frag_threshold;
		mem_blocks = num_mpdus * mem_blocks_per_frag;
		payload_len -= num_mpdus * frag_threshold;
		num_mpdus++;

	} else {
		mem_blocks_per_frag = 0;
		mem_blocks = 0;
		num_mpdus = 1;
	}

	mem_blocks += (payload_len / HW_BLOCK_SIZE) + 1;

	if (num_mpdus > 1)
		mem_blocks += min(num_mpdus, mem_blocks_per_frag);

	tx_hdr->num_mem_blocks = mem_blocks;
}

static int wl1251_tx_fill_hdr(struct wl1251 *wl, struct sk_buff *skb,
			      struct ieee80211_tx_info *control)
{
	struct tx_double_buffer_desc *tx_hdr;
	struct ieee80211_rate *rate;
	int id;
	u16 fc;

	if (!skb)
		return -EINVAL;

	id = wl1251_tx_id(wl, skb);
	if (id < 0)
		return id;

	fc = *(u16 *)skb->data;
	tx_hdr = (struct tx_double_buffer_desc *) skb_push(skb,
							   sizeof(*tx_hdr));

	tx_hdr->length = cpu_to_le16(skb->len - sizeof(*tx_hdr));
	rate = ieee80211_get_tx_rate(wl->hw, control);
	tx_hdr->rate = cpu_to_le16(rate->hw_value);
	tx_hdr->expiry_time = cpu_to_le32(1 << 16);
	tx_hdr->id = id;

	tx_hdr->xmit_queue = wl1251_tx_get_queue(skb_get_queue_mapping(skb));

	wl1251_tx_control(tx_hdr, control, fc);
	wl1251_tx_frag_block_num(tx_hdr);

	return 0;
}

/* We copy the packet to the target */
static int wl1251_tx_send_packet(struct wl1251 *wl, struct sk_buff *skb,
				 struct ieee80211_tx_info *control)
{
	struct tx_double_buffer_desc *tx_hdr;
	int len;
	u32 addr;

	if (!skb)
		return -EINVAL;

	tx_hdr = (struct tx_double_buffer_desc *) skb->data;

	if (control->control.hw_key &&
	    control->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
		int hdrlen;
		__le16 fc;
		u16 length;
		u8 *pos;

		fc = *(__le16 *)(skb->data + sizeof(*tx_hdr));
		length = le16_to_cpu(tx_hdr->length) + WL1251_TKIP_IV_SPACE;
		tx_hdr->length = cpu_to_le16(length);

		hdrlen = ieee80211_hdrlen(fc);

		pos = skb_push(skb, WL1251_TKIP_IV_SPACE);
		memmove(pos, pos + WL1251_TKIP_IV_SPACE,
			sizeof(*tx_hdr) + hdrlen);
	}

	/* Revisit. 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;
		wl1251_debug(DEBUG_TX, "skb offset %d", offset);

		/* check whether the current skb can be used */
		if (skb_cloned(skb) || (skb_tailroom(skb) < offset)) {
			struct sk_buff *newskb = skb_copy_expand(skb, 0, 3,
								 GFP_KERNEL);

			if (unlikely(newskb == NULL)) {
				wl1251_error("Can't allocate skb!");
				return -EINVAL;
			}

			tx_hdr = (struct tx_double_buffer_desc *) newskb->data;

			dev_kfree_skb_any(skb);
			wl->tx_frames[tx_hdr->id] = skb = newskb;

			offset = (4 - (long)skb->data) & 0x03;
			wl1251_debug(DEBUG_TX, "new skb offset %d", offset);
		}

		/* align the buffer on a 4-byte boundary */
		if (offset) {
			unsigned char *src = skb->data;
			skb_reserve(skb, offset);
			memmove(skb->data, src, skb->len);
			tx_hdr = (struct tx_double_buffer_desc *) skb->data;
		}
	}

	/* Our skb->data at this point includes the HW header */
	len = WL1251_TX_ALIGN(skb->len);

	if (wl->data_in_count & 0x1)
		addr = wl->data_path->tx_packet_ring_addr +
			wl->data_path->tx_packet_ring_chunk_size;
	else
		addr = wl->data_path->tx_packet_ring_addr;

	wl1251_mem_write(wl, addr, skb->data, len);

	wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x "
		     "queue %d", tx_hdr->id, skb, tx_hdr->length,
		     tx_hdr->rate, tx_hdr->xmit_queue);

	return 0;
}

static void wl1251_tx_trigger(struct wl1251 *wl)
{
	u32 data, addr;

	if (wl->data_in_count & 0x1) {
		addr = ACX_REG_INTERRUPT_TRIG_H;
		data = INTR_TRIG_TX_PROC1;
	} else {
		addr = ACX_REG_INTERRUPT_TRIG;
		data = INTR_TRIG_TX_PROC0;
	}

	wl1251_reg_write32(wl, addr, data);

	/* Bumping data in */
	wl->data_in_count = (wl->data_in_count + 1) &
		TX_STATUS_DATA_OUT_COUNT_MASK;
}

/* caller must hold wl->mutex */
static int wl1251_tx_frame(struct wl1251 *wl, struct sk_buff *skb)
{
	struct ieee80211_tx_info *info;
	int ret = 0;
	u8 idx;

	info = IEEE80211_SKB_CB(skb);

	if (info->control.hw_key) {
		idx = info->control.hw_key->hw_key_idx;
		if (unlikely(wl->default_key != idx)) {
			ret = wl1251_acx_default_key(wl, idx);
			if (ret < 0)
				return ret;
		}
	}

	ret = wl1251_tx_path_status(wl);
	if (ret < 0)
		return ret;

	ret = wl1251_tx_fill_hdr(wl, skb, info);
	if (ret < 0)
		return ret;

	ret = wl1251_tx_send_packet(wl, skb, info);
	if (ret < 0)
		return ret;

	wl1251_tx_trigger(wl);

	return ret;
}

void wl1251_tx_work(struct work_struct *work)
{
	struct wl1251 *wl = container_of(work, struct wl1251, tx_work);
	struct sk_buff *skb;
	bool woken_up = false;
	int ret;

	mutex_lock(&wl->mutex);

	if (unlikely(wl->state == WL1251_STATE_OFF))
		goto out;

	while ((skb = skb_dequeue(&wl->tx_queue))) {
		if (!woken_up) {
			ret = wl1251_ps_elp_wakeup(wl);
			if (ret < 0)
				goto out;
			woken_up = true;
		}

		ret = wl1251_tx_frame(wl, skb);
		if (ret == -EBUSY) {
			skb_queue_head(&wl->tx_queue, skb);
			goto out;
		} else if (ret < 0) {
			dev_kfree_skb(skb);
			goto out;
		}
	}

out:
	if (woken_up)
		wl1251_ps_elp_sleep(wl);

	mutex_unlock(&wl->mutex);
}

static const char *wl1251_tx_parse_status(u8 status)
{
	/* 8 bit status field, one character per bit plus null */
	static char buf[9];
	int i = 0;

	memset(buf, 0, sizeof(buf));

	if (status & TX_DMA_ERROR)
		buf[i++] = 'm';
	if (status & TX_DISABLED)
		buf[i++] = 'd';
	if (status & TX_RETRY_EXCEEDED)
		buf[i++] = 'r';
	if (status & TX_TIMEOUT)
		buf[i++] = 't';
	if (status & TX_KEY_NOT_FOUND)
		buf[i++] = 'k';
	if (status & TX_ENCRYPT_FAIL)
		buf[i++] = 'e';
	if (status & TX_UNAVAILABLE_PRIORITY)
		buf[i++] = 'p';

	/* bit 0 is unused apparently */

	return buf;
}

static void wl1251_tx_packet_cb(struct wl1251 *wl,
				struct tx_result *result)
{
	struct ieee80211_tx_info *info;
	struct sk_buff *skb;
	int hdrlen;
	u8 *frame;

	skb = wl->tx_frames[result->id];
	if (skb == NULL) {
		wl1251_error("SKB for packet %d is NULL", result->id);
		return;
	}

	info = IEEE80211_SKB_CB(skb);

	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
	    (result->status == TX_SUCCESS))
		info->flags |= IEEE80211_TX_STAT_ACK;

	info->status.rates[0].count = result->ack_failures + 1;
	wl->stats.retry_count += result->ack_failures;

	/*
	 * We have to remove our private TX header before pushing
	 * the skb back to mac80211.
	 */
	frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc));
	if (info->control.hw_key &&
	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
		hdrlen = ieee80211_get_hdrlen_from_skb(skb);
		memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen);
		skb_pull(skb, WL1251_TKIP_IV_SPACE);
	}

	wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
		     " status 0x%x (%s)",
		     result->id, skb, result->ack_failures, result->rate,
		     result->status, wl1251_tx_parse_status(result->status));


	ieee80211_tx_status(wl->hw, skb);

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

/* Called upon reception of a TX complete interrupt */
void wl1251_tx_complete(struct wl1251 *wl)
{
	int i, result_index, num_complete = 0, queue_len;
	struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
	unsigned long flags;

	if (unlikely(wl->state != WL1251_STATE_ON))
		return;

	/* First we read the result */
	wl1251_mem_read(wl, wl->data_path->tx_complete_addr,
			    result, sizeof(result));

	result_index = wl->next_tx_complete;

	for (i = 0; i < ARRAY_SIZE(result); i++) {
		result_ptr = &result[result_index];

		if (result_ptr->done_1 == 1 &&
		    result_ptr->done_2 == 1) {
			wl1251_tx_packet_cb(wl, result_ptr);

			result_ptr->done_1 = 0;
			result_ptr->done_2 = 0;

			result_index = (result_index + 1) &
				(FW_TX_CMPLT_BLOCK_SIZE - 1);
			num_complete++;
		} else {
			break;
		}
	}

	queue_len = skb_queue_len(&wl->tx_queue);

	if ((num_complete > 0) && (queue_len > 0)) {
		/* firmware buffer has space, reschedule tx_work */
		wl1251_debug(DEBUG_TX, "tx_complete: reschedule tx_work");
		ieee80211_queue_work(wl->hw, &wl->tx_work);
	}

	if (wl->tx_queue_stopped &&
	    queue_len <= WL1251_TX_QUEUE_LOW_WATERMARK) {
		/* tx_queue has space, restart queues */
		wl1251_debug(DEBUG_TX, "tx_complete: waking queues");
		spin_lock_irqsave(&wl->wl_lock, flags);
		ieee80211_wake_queues(wl->hw);
		wl->tx_queue_stopped = false;
		spin_unlock_irqrestore(&wl->wl_lock, flags);
	}

	/* Every completed frame needs to be acknowledged */
	if (num_complete) {
		/*
		 * If we've wrapped, we have to clear
		 * the results in 2 steps.
		 */
		if (result_index > wl->next_tx_complete) {
			/* Only 1 write is needed */
			wl1251_mem_write(wl,
					 wl->data_path->tx_complete_addr +
					 (wl->next_tx_complete *
					  sizeof(struct tx_result)),
					 &result[wl->next_tx_complete],
					 num_complete *
					 sizeof(struct tx_result));


		} else if (result_index < wl->next_tx_complete) {
			/* 2 writes are needed */
			wl1251_mem_write(wl,
					 wl->data_path->tx_complete_addr +
					 (wl->next_tx_complete *
					  sizeof(struct tx_result)),
					 &result[wl->next_tx_complete],
					 (FW_TX_CMPLT_BLOCK_SIZE -
					  wl->next_tx_complete) *
					 sizeof(struct tx_result));

			wl1251_mem_write(wl,
					 wl->data_path->tx_complete_addr,
					 result,
					 (num_complete -
					  FW_TX_CMPLT_BLOCK_SIZE +
					  wl->next_tx_complete) *
					 sizeof(struct tx_result));

		} else {
			/* We have to write the whole array */
			wl1251_mem_write(wl,
					 wl->data_path->tx_complete_addr,
					 result,
					 FW_TX_CMPLT_BLOCK_SIZE *
					 sizeof(struct tx_result));
		}

	}

	wl->next_tx_complete = result_index;
}

/* caller must hold wl->mutex */
void wl1251_tx_flush(struct wl1251 *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);

		wl1251_debug(DEBUG_TX, "flushing skb 0x%p", skb);

		if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
				continue;

		ieee80211_tx_status(wl->hw, skb);
	}

	for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; 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))
				continue;

			ieee80211_tx_status(wl->hw, skb);
			wl->tx_frames[i] = NULL;
		}
}
Commit	Line	Data
2f01a1f5	1	/*
80301cdc	2	* This file is part of wl1251
2f01a1f5 KV	3	*
	4	* Copyright (c) 1998-2007 Texas Instruments Incorporated
	5	* Copyright (C) 2008 Nokia Corporation
	6	*
2f01a1f5 KV	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* version 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	19	* 02110-1301 USA
	20	*
	21	*/
	22
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25
13674118	26	#include "wl1251.h"
9bc6772e KV	27	#include "reg.h"
	28	#include "tx.h"
	29	#include "ps.h"
	30	#include "io.h"
2f01a1f5	31
80301cdc	32	static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count)
2f01a1f5 KV	33	{
	34	int used, data_in_count;
	35
	36	data_in_count = wl->data_in_count;
	37
	38	if (data_in_count < data_out_count)
	39	/* data_in_count has wrapped */
	40	data_in_count += TX_STATUS_DATA_OUT_COUNT_MASK + 1;
	41
	42	used = data_in_count - data_out_count;
	43
	44	WARN_ON(used < 0);
	45	WARN_ON(used > DP_TX_PACKET_RING_CHUNK_NUM);
	46
	47	if (used >= DP_TX_PACKET_RING_CHUNK_NUM)
	48	return true;
	49	else
	50	return false;
	51	}
	52
80301cdc	53	static int wl1251_tx_path_status(struct wl1251 *wl)
2f01a1f5 KV	54	{
	55	u32 status, addr, data_out_count;
	56	bool busy;
	57
	58	addr = wl->data_path->tx_control_addr;
80301cdc	59	status = wl1251_mem_read32(wl, addr);
2f01a1f5	60	data_out_count = status & TX_STATUS_DATA_OUT_COUNT_MASK;
9f2ad4fb	61	busy = wl1251_tx_double_buffer_busy(wl, data_out_count);
2f01a1f5 KV	62
	63	if (busy)
	64	return -EBUSY;
	65
	66	return 0;
	67	}
	68
80301cdc	69	static int wl1251_tx_id(struct wl1251 wl, struct sk_buff skb)
2f01a1f5 KV	70	{
	71	int i;
	72
	73	for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
	74	if (wl->tx_frames[i] == NULL) {
	75	wl->tx_frames[i] = skb;
	76	return i;
	77	}
	78
	79	return -EBUSY;
	80	}
	81
9f2ad4fb	82	static void wl1251_tx_control(struct tx_double_buffer_desc *tx_hdr,
2f01a1f5 KV	83	struct ieee80211_tx_info *control, u16 fc)
	84	{
	85	(u16 )&tx_hdr->control = 0;
	86
	87	tx_hdr->control.rate_policy = 0;
	88
	89	/* 802.11 packets */
	90	tx_hdr->control.packet_type = 0;
	91
	92	if (control->flags & IEEE80211_TX_CTL_NO_ACK)
	93	tx_hdr->control.ack_policy = 1;
	94
	95	tx_hdr->control.tx_complete = 1;
	96
	97	if ((fc & IEEE80211_FTYPE_DATA) &&
	98	((fc & IEEE80211_STYPE_QOS_DATA) \|\|
	99	(fc & IEEE80211_STYPE_QOS_NULLFUNC)))
	100	tx_hdr->control.qos = 1;
	101	}
	102
	103	/* RSN + MIC = 8 + 8 = 16 bytes (worst case - AES). */
	104	#define MAX_MSDU_SECURITY_LENGTH 16
	105	#define MAX_MPDU_SECURITY_LENGTH 16
	106	#define WLAN_QOS_HDR_LEN 26
	107	#define MAX_MPDU_HEADER_AND_SECURITY (MAX_MPDU_SECURITY_LENGTH + \
	108	WLAN_QOS_HDR_LEN)
	109	#define HW_BLOCK_SIZE 252
9f2ad4fb	110	static void wl1251_tx_frag_block_num(struct tx_double_buffer_desc *tx_hdr)
2f01a1f5 KV	111	{
	112	u16 payload_len, frag_threshold, mem_blocks;
	113	u16 num_mpdus, mem_blocks_per_frag;
	114
	115	frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
	116	tx_hdr->frag_threshold = cpu_to_le16(frag_threshold);
	117
1ab36d68	118	payload_len = le16_to_cpu(tx_hdr->length) + MAX_MSDU_SECURITY_LENGTH;
2f01a1f5 KV	119
	120	if (payload_len > frag_threshold) {
	121	mem_blocks_per_frag =
	122	((frag_threshold + MAX_MPDU_HEADER_AND_SECURITY) /
	123	HW_BLOCK_SIZE) + 1;
	124	num_mpdus = payload_len / frag_threshold;
	125	mem_blocks = num_mpdus * mem_blocks_per_frag;
	126	payload_len -= num_mpdus * frag_threshold;
	127	num_mpdus++;
	128
	129	} else {
	130	mem_blocks_per_frag = 0;
	131	mem_blocks = 0;
	132	num_mpdus = 1;
	133	}
	134
	135	mem_blocks += (payload_len / HW_BLOCK_SIZE) + 1;
	136
	137	if (num_mpdus > 1)
	138	mem_blocks += min(num_mpdus, mem_blocks_per_frag);
	139
	140	tx_hdr->num_mem_blocks = mem_blocks;
	141	}
	142
80301cdc	143	static int wl1251_tx_fill_hdr(struct wl1251 wl, struct sk_buff skb,
2f01a1f5 KV	144	struct ieee80211_tx_info *control)
	145	{
	146	struct tx_double_buffer_desc *tx_hdr;
	147	struct ieee80211_rate *rate;
	148	int id;
	149	u16 fc;
	150
	151	if (!skb)
	152	return -EINVAL;
	153
9f2ad4fb	154	id = wl1251_tx_id(wl, skb);
2f01a1f5 KV	155	if (id < 0)
	156	return id;
	157
	158	fc = (u16 )skb->data;
	159	tx_hdr = (struct tx_double_buffer_desc *) skb_push(skb,
	160	sizeof(*tx_hdr));
	161
	162	tx_hdr->length = cpu_to_le16(skb->len - sizeof(*tx_hdr));
	163	rate = ieee80211_get_tx_rate(wl->hw, control);
	164	tx_hdr->rate = cpu_to_le16(rate->hw_value);
	165	tx_hdr->expiry_time = cpu_to_le32(1 << 16);
	166	tx_hdr->id = id;
	167
49e1b9fa	168	tx_hdr->xmit_queue = wl1251_tx_get_queue(skb_get_queue_mapping(skb));
2f01a1f5	169
9f2ad4fb JO	170	wl1251_tx_control(tx_hdr, control, fc);
9f2ad4fb JO	171	wl1251_tx_frag_block_num(tx_hdr);
2f01a1f5 KV	172
	173	return 0;
	174	}
	175
	176	/* We copy the packet to the target */
80301cdc	177	static int wl1251_tx_send_packet(struct wl1251 wl, struct sk_buff skb,
2f01a1f5 KV	178	struct ieee80211_tx_info *control)
	179	{
	180	struct tx_double_buffer_desc *tx_hdr;
	181	int len;
	182	u32 addr;
	183
	184	if (!skb)
	185	return -EINVAL;
	186
	187	tx_hdr = (struct tx_double_buffer_desc *) skb->data;
	188
	189	if (control->control.hw_key &&
97359d12	190	control->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
2f01a1f5	191	int hdrlen;
1ab36d68 JL	192	__le16 fc;
1ab36d68 JL	193	u16 length;
2f01a1f5 KV	194	u8 *pos;
2f01a1f5 KV	195
1ab36d68 JL	196	fc = (__le16 )(skb->data + sizeof(*tx_hdr));
	197	length = le16_to_cpu(tx_hdr->length) + WL1251_TKIP_IV_SPACE;
	198	tx_hdr->length = cpu_to_le16(length);
2f01a1f5 KV	199
	200	hdrlen = ieee80211_hdrlen(fc);
	201
9f2ad4fb JO	202	pos = skb_push(skb, WL1251_TKIP_IV_SPACE);
9f2ad4fb JO	203	memmove(pos, pos + WL1251_TKIP_IV_SPACE,
2f01a1f5 KV	204	sizeof(*tx_hdr) + hdrlen);
	205	}
	206
	207	/* Revisit. This is a workaround for getting non-aligned packets.
	208	This happens at least with EAPOL packets from the user space.
	209	Our DMA requires packets to be aligned on a 4-byte boundary.
	210	*/
	211	if (unlikely((long)skb->data & 0x03)) {
	212	int offset = (4 - (long)skb->data) & 0x03;
80301cdc	213	wl1251_debug(DEBUG_TX, "skb offset %d", offset);
2f01a1f5 KV	214
2f01a1f5 KV	215	/* check whether the current skb can be used */
bb4793b3 DG	216	if (skb_cloned(skb) \|\| (skb_tailroom(skb) < offset)) {
	217	struct sk_buff *newskb = skb_copy_expand(skb, 0, 3,
	218	GFP_KERNEL);
	219
	220	if (unlikely(newskb == NULL)) {
	221	wl1251_error("Can't allocate skb!");
	222	return -EINVAL;
	223	}
	224
	225	tx_hdr = (struct tx_double_buffer_desc *) newskb->data;
	226
	227	dev_kfree_skb_any(skb);
	228	wl->tx_frames[tx_hdr->id] = skb = newskb;
2f01a1f5	229
bb4793b3 DG	230	offset = (4 - (long)skb->data) & 0x03;
	231	wl1251_debug(DEBUG_TX, "new skb offset %d", offset);
	232	}
	233
	234	/* align the buffer on a 4-byte boundary */
	235	if (offset) {
	236	unsigned char *src = skb->data;
2f01a1f5 KV	237	skb_reserve(skb, offset);
2f01a1f5 KV	238	memmove(skb->data, src, skb->len);
46cb35f5	239	tx_hdr = (struct tx_double_buffer_desc *) skb->data;
2f01a1f5 KV	240	}
	241	}
	242
	243	/* Our skb->data at this point includes the HW header */
9f2ad4fb	244	len = WL1251_TX_ALIGN(skb->len);
2f01a1f5 KV	245
	246	if (wl->data_in_count & 0x1)
	247	addr = wl->data_path->tx_packet_ring_addr +
	248	wl->data_path->tx_packet_ring_chunk_size;
	249	else
	250	addr = wl->data_path->tx_packet_ring_addr;
	251
0764de64	252	wl1251_mem_write(wl, addr, skb->data, len);
2f01a1f5	253
49e1b9fa KV	254	wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x "
	255	"queue %d", tx_hdr->id, skb, tx_hdr->length,
	256	tx_hdr->rate, tx_hdr->xmit_queue);
2f01a1f5 KV	257
	258	return 0;
	259	}
	260
80301cdc	261	static void wl1251_tx_trigger(struct wl1251 *wl)
2f01a1f5 KV	262	{
	263	u32 data, addr;
	264
	265	if (wl->data_in_count & 0x1) {
	266	addr = ACX_REG_INTERRUPT_TRIG_H;
	267	data = INTR_TRIG_TX_PROC1;
	268	} else {
	269	addr = ACX_REG_INTERRUPT_TRIG;
	270	data = INTR_TRIG_TX_PROC0;
	271	}
	272
80301cdc	273	wl1251_reg_write32(wl, addr, data);
2f01a1f5 KV	274
	275	/* Bumping data in */
	276	wl->data_in_count = (wl->data_in_count + 1) &
	277	TX_STATUS_DATA_OUT_COUNT_MASK;
	278	}
	279
	280	/* caller must hold wl->mutex */
80301cdc	281	static int wl1251_tx_frame(struct wl1251 wl, struct sk_buff skb)
2f01a1f5 KV	282	{
	283	struct ieee80211_tx_info *info;
	284	int ret = 0;
	285	u8 idx;
	286
	287	info = IEEE80211_SKB_CB(skb);
	288
	289	if (info->control.hw_key) {
	290	idx = info->control.hw_key->hw_key_idx;
	291	if (unlikely(wl->default_key != idx)) {
80301cdc	292	ret = wl1251_acx_default_key(wl, idx);
2f01a1f5 KV	293	if (ret < 0)
	294	return ret;
	295	}
	296	}
	297
9f2ad4fb	298	ret = wl1251_tx_path_status(wl);
2f01a1f5 KV	299	if (ret < 0)
	300	return ret;
	301
9f2ad4fb	302	ret = wl1251_tx_fill_hdr(wl, skb, info);
2f01a1f5 KV	303	if (ret < 0)
	304	return ret;
	305
9f2ad4fb	306	ret = wl1251_tx_send_packet(wl, skb, info);
2f01a1f5 KV	307	if (ret < 0)
	308	return ret;
	309
9f2ad4fb	310	wl1251_tx_trigger(wl);
2f01a1f5 KV	311
	312	return ret;
	313	}
	314
9f2ad4fb	315	void wl1251_tx_work(struct work_struct *work)
2f01a1f5	316	{
80301cdc	317	struct wl1251 *wl = container_of(work, struct wl1251, tx_work);
2f01a1f5 KV	318	struct sk_buff *skb;
	319	bool woken_up = false;
	320	int ret;
	321
	322	mutex_lock(&wl->mutex);
	323
80301cdc	324	if (unlikely(wl->state == WL1251_STATE_OFF))
2f01a1f5 KV	325	goto out;
	326
	327	while ((skb = skb_dequeue(&wl->tx_queue))) {
	328	if (!woken_up) {
80301cdc	329	ret = wl1251_ps_elp_wakeup(wl);
c5483b71 KV	330	if (ret < 0)
c5483b71 KV	331	goto out;
2f01a1f5 KV	332	woken_up = true;
	333	}
	334
9f2ad4fb	335	ret = wl1251_tx_frame(wl, skb);
2f01a1f5	336	if (ret == -EBUSY) {
2f01a1f5 KV	337	skb_queue_head(&wl->tx_queue, skb);
	338	goto out;
	339	} else if (ret < 0) {
	340	dev_kfree_skb(skb);
	341	goto out;
	342	}
	343	}
	344
	345	out:
	346	if (woken_up)
80301cdc	347	wl1251_ps_elp_sleep(wl);
2f01a1f5 KV	348
	349	mutex_unlock(&wl->mutex);
	350	}
	351
9f2ad4fb	352	static const char *wl1251_tx_parse_status(u8 status)
2f01a1f5 KV	353	{
	354	/* 8 bit status field, one character per bit plus null */
	355	static char buf[9];
	356	int i = 0;
	357
	358	memset(buf, 0, sizeof(buf));
	359
	360	if (status & TX_DMA_ERROR)
	361	buf[i++] = 'm';
	362	if (status & TX_DISABLED)
	363	buf[i++] = 'd';
	364	if (status & TX_RETRY_EXCEEDED)
	365	buf[i++] = 'r';
	366	if (status & TX_TIMEOUT)
	367	buf[i++] = 't';
	368	if (status & TX_KEY_NOT_FOUND)
	369	buf[i++] = 'k';
	370	if (status & TX_ENCRYPT_FAIL)
	371	buf[i++] = 'e';
	372	if (status & TX_UNAVAILABLE_PRIORITY)
	373	buf[i++] = 'p';
	374
	375	/* bit 0 is unused apparently */
	376
	377	return buf;
	378	}
	379
80301cdc	380	static void wl1251_tx_packet_cb(struct wl1251 *wl,
2f01a1f5 KV	381	struct tx_result *result)
	382	{
	383	struct ieee80211_tx_info *info;
	384	struct sk_buff *skb;
e7332a41	385	int hdrlen;
2f01a1f5 KV	386	u8 *frame;
	387
	388	skb = wl->tx_frames[result->id];
	389	if (skb == NULL) {
80301cdc	390	wl1251_error("SKB for packet %d is NULL", result->id);
2f01a1f5 KV	391	return;
	392	}
	393
	394	info = IEEE80211_SKB_CB(skb);
	395
	396	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
	397	(result->status == TX_SUCCESS))
	398	info->flags \|= IEEE80211_TX_STAT_ACK;
	399
	400	info->status.rates[0].count = result->ack_failures + 1;
	401	wl->stats.retry_count += result->ack_failures;
	402
	403	/*
	404	* We have to remove our private TX header before pushing
	405	* the skb back to mac80211.
	406	*/
	407	frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc));
	408	if (info->control.hw_key &&
97359d12	409	info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
2f01a1f5	410	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
9f2ad4fb JO	411	memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen);
9f2ad4fb JO	412	skb_pull(skb, WL1251_TKIP_IV_SPACE);
2f01a1f5 KV	413	}
2f01a1f5 KV	414
80301cdc	415	wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
2f01a1f5 KV	416	" status 0x%x (%s)",
2f01a1f5 KV	417	result->id, skb, result->ack_failures, result->rate,
9f2ad4fb	418	result->status, wl1251_tx_parse_status(result->status));
2f01a1f5 KV	419
	420
	421	ieee80211_tx_status(wl->hw, skb);
	422
	423	wl->tx_frames[result->id] = NULL;
2f01a1f5 KV	424	}
	425
	426	/* Called upon reception of a TX complete interrupt */
80301cdc	427	void wl1251_tx_complete(struct wl1251 *wl)
2f01a1f5	428	{
e7332a41	429	int i, result_index, num_complete = 0, queue_len;
2f01a1f5	430	struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
9df86e2e	431	unsigned long flags;
2f01a1f5	432
80301cdc	433	if (unlikely(wl->state != WL1251_STATE_ON))
2f01a1f5 KV	434	return;
	435
	436	/* First we read the result */
0764de64	437	wl1251_mem_read(wl, wl->data_path->tx_complete_addr,
2f01a1f5 KV	438	result, sizeof(result));
	439
	440	result_index = wl->next_tx_complete;
	441
	442	for (i = 0; i < ARRAY_SIZE(result); i++) {
	443	result_ptr = &result[result_index];
	444
	445	if (result_ptr->done_1 == 1 &&
	446	result_ptr->done_2 == 1) {
9f2ad4fb	447	wl1251_tx_packet_cb(wl, result_ptr);
2f01a1f5 KV	448
	449	result_ptr->done_1 = 0;
	450	result_ptr->done_2 = 0;
	451
	452	result_index = (result_index + 1) &
	453	(FW_TX_CMPLT_BLOCK_SIZE - 1);
	454	num_complete++;
	455	} else {
	456	break;
	457	}
	458	}
	459
e7332a41	460	queue_len = skb_queue_len(&wl->tx_queue);
9df86e2e	461
e7332a41 DG	462	if ((num_complete > 0) && (queue_len > 0)) {
	463	/* firmware buffer has space, reschedule tx_work */
	464	wl1251_debug(DEBUG_TX, "tx_complete: reschedule tx_work");
	465	ieee80211_queue_work(wl->hw, &wl->tx_work);
	466	}
	467
	468	if (wl->tx_queue_stopped &&
	469	queue_len <= WL1251_TX_QUEUE_LOW_WATERMARK) {
	470	/* tx_queue has space, restart queues */
9df86e2e DGC	471	wl1251_debug(DEBUG_TX, "tx_complete: waking queues");
	472	spin_lock_irqsave(&wl->wl_lock, flags);
	473	ieee80211_wake_queues(wl->hw);
	474	wl->tx_queue_stopped = false;
	475	spin_unlock_irqrestore(&wl->wl_lock, flags);
9df86e2e DGC	476	}
9df86e2e DGC	477
2f01a1f5 KV	478	/* Every completed frame needs to be acknowledged */
	479	if (num_complete) {
	480	/*
	481	* If we've wrapped, we have to clear
	482	* the results in 2 steps.
	483	*/
	484	if (result_index > wl->next_tx_complete) {
	485	/* Only 1 write is needed */
0764de64 BC	486	wl1251_mem_write(wl,
	487	wl->data_path->tx_complete_addr +
	488	(wl->next_tx_complete *
	489	sizeof(struct tx_result)),
	490	&result[wl->next_tx_complete],
	491	num_complete *
	492	sizeof(struct tx_result));
2f01a1f5 KV	493
	494
	495	} else if (result_index < wl->next_tx_complete) {
	496	/* 2 writes are needed */
0764de64 BC	497	wl1251_mem_write(wl,
	498	wl->data_path->tx_complete_addr +
	499	(wl->next_tx_complete *
	500	sizeof(struct tx_result)),
	501	&result[wl->next_tx_complete],
	502	(FW_TX_CMPLT_BLOCK_SIZE -
	503	wl->next_tx_complete) *
	504	sizeof(struct tx_result));
	505
	506	wl1251_mem_write(wl,
	507	wl->data_path->tx_complete_addr,
	508	result,
	509	(num_complete -
	510	FW_TX_CMPLT_BLOCK_SIZE +
	511	wl->next_tx_complete) *
	512	sizeof(struct tx_result));
2f01a1f5 KV	513
	514	} else {
	515	/* We have to write the whole array */
0764de64 BC	516	wl1251_mem_write(wl,
	517	wl->data_path->tx_complete_addr,
	518	result,
	519	FW_TX_CMPLT_BLOCK_SIZE *
	520	sizeof(struct tx_result));
2f01a1f5 KV	521	}
	522
	523	}
	524
	525	wl->next_tx_complete = result_index;
	526	}
	527
	528	/* caller must hold wl->mutex */
80301cdc	529	void wl1251_tx_flush(struct wl1251 *wl)
2f01a1f5 KV	530	{
	531	int i;
	532	struct sk_buff *skb;
	533	struct ieee80211_tx_info *info;
	534
	535	/* TX failure */
	536	/* control->flags = 0; FIXME */
	537
	538	while ((skb = skb_dequeue(&wl->tx_queue))) {
	539	info = IEEE80211_SKB_CB(skb);
	540
80301cdc	541	wl1251_debug(DEBUG_TX, "flushing skb 0x%p", skb);
2f01a1f5 KV	542
	543	if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
	544	continue;
	545
	546	ieee80211_tx_status(wl->hw, skb);
	547	}
	548
	549	for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
	550	if (wl->tx_frames[i] != NULL) {
	551	skb = wl->tx_frames[i];
	552	info = IEEE80211_SKB_CB(skb);
	553
	554	if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
	555	continue;
	556
	557	ieee80211_tx_status(wl->hw, skb);
	558	wl->tx_frames[i] = NULL;
	559	}
	560	}