[net-next-2.6.git] / drivers / net / wireless / wl12xx / 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 "wl1251_reg.h"
#include "wl1251_tx.h"
#include "wl1251_ps.h"
#include "wl1251_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)) {
			unsigned char *src = skb->data;

			/* align the buffer on a 4-byte boundary */
			skb_reserve(skb, offset);
			memmove(skb->data, src, skb->len);
			tx_hdr = (struct tx_double_buffer_desc *) skb->data;
		} else {
			wl1251_info("No handler, fixme!");
			return -EINVAL;
		}
	}

	/* 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, ret;
	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;

	if (wl->tx_queue_stopped) {
		wl1251_debug(DEBUG_TX, "cb: queue was stopped");

		skb = skb_dequeue(&wl->tx_queue);

		/* The skb can be NULL because tx_work might have been
		   scheduled before the queue was stopped making the
		   queue empty */

		if (skb) {
			ret = wl1251_tx_frame(wl, skb);
			if (ret == -EBUSY) {
				/* firmware buffer is still full */
				wl1251_debug(DEBUG_TX, "cb: fw buffer "
					     "still full");
				skb_queue_head(&wl->tx_queue, skb);
				return;
			} else if (ret < 0) {
				dev_kfree_skb(skb);
				return;
			}
		}

		wl1251_debug(DEBUG_TX, "cb: waking queues");
		ieee80211_wake_queues(wl->hw);
		wl->tx_queue_stopped = false;
	}
}

/* Called upon reception of a TX complete interrupt */
void wl1251_tx_complete(struct wl1251 *wl)
{
	int i, result_index, num_complete = 0;
	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;
		}
	}

	if (wl->tx_queue_stopped
	    &&
	    skb_queue_len(&wl->tx_queue) <= WL1251_TX_QUEUE_LOW_WATERMARK){

		/* firmware buffer 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);
		ieee80211_queue_work(wl->hw, &wl->tx_work);

	}

	/* 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"
29d904c4	27	#include "wl1251_reg.h"
9f2ad4fb	28	#include "wl1251_tx.h"
ef2f8d45	29	#include "wl1251_ps.h"
0764de64	30	#include "wl1251_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
	215	/* check whether the current skb can be used */
	216	if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
	217	unsigned char *src = skb->data;
	218
	219	/* align the buffer on a 4-byte boundary */
	220	skb_reserve(skb, offset);
	221	memmove(skb->data, src, skb->len);
46cb35f5	222	tx_hdr = (struct tx_double_buffer_desc *) skb->data;
2f01a1f5	223	} else {
80301cdc	224	wl1251_info("No handler, fixme!");
2f01a1f5 KV	225	return -EINVAL;
	226	}
	227	}
	228
	229	/* Our skb->data at this point includes the HW header */
9f2ad4fb	230	len = WL1251_TX_ALIGN(skb->len);
2f01a1f5 KV	231
	232	if (wl->data_in_count & 0x1)
	233	addr = wl->data_path->tx_packet_ring_addr +
	234	wl->data_path->tx_packet_ring_chunk_size;
	235	else
	236	addr = wl->data_path->tx_packet_ring_addr;
	237
0764de64	238	wl1251_mem_write(wl, addr, skb->data, len);
2f01a1f5	239
49e1b9fa KV	240	wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x "
	241	"queue %d", tx_hdr->id, skb, tx_hdr->length,
	242	tx_hdr->rate, tx_hdr->xmit_queue);
2f01a1f5 KV	243
	244	return 0;
	245	}
	246
80301cdc	247	static void wl1251_tx_trigger(struct wl1251 *wl)
2f01a1f5 KV	248	{
	249	u32 data, addr;
	250
	251	if (wl->data_in_count & 0x1) {
	252	addr = ACX_REG_INTERRUPT_TRIG_H;
	253	data = INTR_TRIG_TX_PROC1;
	254	} else {
	255	addr = ACX_REG_INTERRUPT_TRIG;
	256	data = INTR_TRIG_TX_PROC0;
	257	}
	258
80301cdc	259	wl1251_reg_write32(wl, addr, data);
2f01a1f5 KV	260
	261	/* Bumping data in */
	262	wl->data_in_count = (wl->data_in_count + 1) &
	263	TX_STATUS_DATA_OUT_COUNT_MASK;
	264	}
	265
	266	/* caller must hold wl->mutex */
80301cdc	267	static int wl1251_tx_frame(struct wl1251 wl, struct sk_buff skb)
2f01a1f5 KV	268	{
	269	struct ieee80211_tx_info *info;
	270	int ret = 0;
	271	u8 idx;
	272
	273	info = IEEE80211_SKB_CB(skb);
	274
	275	if (info->control.hw_key) {
	276	idx = info->control.hw_key->hw_key_idx;
	277	if (unlikely(wl->default_key != idx)) {
80301cdc	278	ret = wl1251_acx_default_key(wl, idx);
2f01a1f5 KV	279	if (ret < 0)
	280	return ret;
	281	}
	282	}
	283
9f2ad4fb	284	ret = wl1251_tx_path_status(wl);
2f01a1f5 KV	285	if (ret < 0)
	286	return ret;
	287
9f2ad4fb	288	ret = wl1251_tx_fill_hdr(wl, skb, info);
2f01a1f5 KV	289	if (ret < 0)
	290	return ret;
	291
9f2ad4fb	292	ret = wl1251_tx_send_packet(wl, skb, info);
2f01a1f5 KV	293	if (ret < 0)
	294	return ret;
	295
9f2ad4fb	296	wl1251_tx_trigger(wl);
2f01a1f5 KV	297
	298	return ret;
	299	}
	300
9f2ad4fb	301	void wl1251_tx_work(struct work_struct *work)
2f01a1f5	302	{
80301cdc	303	struct wl1251 *wl = container_of(work, struct wl1251, tx_work);
2f01a1f5 KV	304	struct sk_buff *skb;
	305	bool woken_up = false;
	306	int ret;
	307
	308	mutex_lock(&wl->mutex);
	309
80301cdc	310	if (unlikely(wl->state == WL1251_STATE_OFF))
2f01a1f5 KV	311	goto out;
	312
	313	while ((skb = skb_dequeue(&wl->tx_queue))) {
	314	if (!woken_up) {
80301cdc	315	ret = wl1251_ps_elp_wakeup(wl);
c5483b71 KV	316	if (ret < 0)
c5483b71 KV	317	goto out;
2f01a1f5 KV	318	woken_up = true;
	319	}
	320
9f2ad4fb	321	ret = wl1251_tx_frame(wl, skb);
2f01a1f5	322	if (ret == -EBUSY) {
2f01a1f5 KV	323	skb_queue_head(&wl->tx_queue, skb);
	324	goto out;
	325	} else if (ret < 0) {
	326	dev_kfree_skb(skb);
	327	goto out;
	328	}
	329	}
	330
	331	out:
	332	if (woken_up)
80301cdc	333	wl1251_ps_elp_sleep(wl);
2f01a1f5 KV	334
	335	mutex_unlock(&wl->mutex);
	336	}
	337
9f2ad4fb	338	static const char *wl1251_tx_parse_status(u8 status)
2f01a1f5 KV	339	{
	340	/* 8 bit status field, one character per bit plus null */
	341	static char buf[9];
	342	int i = 0;
	343
	344	memset(buf, 0, sizeof(buf));
	345
	346	if (status & TX_DMA_ERROR)
	347	buf[i++] = 'm';
	348	if (status & TX_DISABLED)
	349	buf[i++] = 'd';
	350	if (status & TX_RETRY_EXCEEDED)
	351	buf[i++] = 'r';
	352	if (status & TX_TIMEOUT)
	353	buf[i++] = 't';
	354	if (status & TX_KEY_NOT_FOUND)
	355	buf[i++] = 'k';
	356	if (status & TX_ENCRYPT_FAIL)
	357	buf[i++] = 'e';
	358	if (status & TX_UNAVAILABLE_PRIORITY)
	359	buf[i++] = 'p';
	360
	361	/* bit 0 is unused apparently */
	362
	363	return buf;
	364	}
	365
80301cdc	366	static void wl1251_tx_packet_cb(struct wl1251 *wl,
2f01a1f5 KV	367	struct tx_result *result)
	368	{
	369	struct ieee80211_tx_info *info;
	370	struct sk_buff *skb;
	371	int hdrlen, ret;
	372	u8 *frame;
	373
	374	skb = wl->tx_frames[result->id];
	375	if (skb == NULL) {
80301cdc	376	wl1251_error("SKB for packet %d is NULL", result->id);
2f01a1f5 KV	377	return;
	378	}
	379
	380	info = IEEE80211_SKB_CB(skb);
	381
	382	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
	383	(result->status == TX_SUCCESS))
	384	info->flags \|= IEEE80211_TX_STAT_ACK;
	385
	386	info->status.rates[0].count = result->ack_failures + 1;
	387	wl->stats.retry_count += result->ack_failures;
	388
	389	/*
	390	* We have to remove our private TX header before pushing
	391	* the skb back to mac80211.
	392	*/
	393	frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc));
	394	if (info->control.hw_key &&
97359d12	395	info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
2f01a1f5	396	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
9f2ad4fb JO	397	memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen);
9f2ad4fb JO	398	skb_pull(skb, WL1251_TKIP_IV_SPACE);
2f01a1f5 KV	399	}
2f01a1f5 KV	400
80301cdc	401	wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
2f01a1f5 KV	402	" status 0x%x (%s)",
2f01a1f5 KV	403	result->id, skb, result->ack_failures, result->rate,
9f2ad4fb	404	result->status, wl1251_tx_parse_status(result->status));
2f01a1f5 KV	405
	406
	407	ieee80211_tx_status(wl->hw, skb);
	408
	409	wl->tx_frames[result->id] = NULL;
	410
	411	if (wl->tx_queue_stopped) {
80301cdc	412	wl1251_debug(DEBUG_TX, "cb: queue was stopped");
2f01a1f5 KV	413
	414	skb = skb_dequeue(&wl->tx_queue);
	415
	416	/* The skb can be NULL because tx_work might have been
	417	scheduled before the queue was stopped making the
	418	queue empty */
	419
	420	if (skb) {
9f2ad4fb	421	ret = wl1251_tx_frame(wl, skb);
2f01a1f5 KV	422	if (ret == -EBUSY) {
2f01a1f5 KV	423	/* firmware buffer is still full */
80301cdc	424	wl1251_debug(DEBUG_TX, "cb: fw buffer "
2f01a1f5 KV	425	"still full");
	426	skb_queue_head(&wl->tx_queue, skb);
	427	return;
	428	} else if (ret < 0) {
	429	dev_kfree_skb(skb);
	430	return;
	431	}
	432	}
	433
80301cdc	434	wl1251_debug(DEBUG_TX, "cb: waking queues");
2f01a1f5 KV	435	ieee80211_wake_queues(wl->hw);
	436	wl->tx_queue_stopped = false;
	437	}
	438	}
	439
	440	/* Called upon reception of a TX complete interrupt */
80301cdc	441	void wl1251_tx_complete(struct wl1251 *wl)
2f01a1f5 KV	442	{
	443	int i, result_index, num_complete = 0;
	444	struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
9df86e2e	445	unsigned long flags;
2f01a1f5	446
80301cdc	447	if (unlikely(wl->state != WL1251_STATE_ON))
2f01a1f5 KV	448	return;
	449
	450	/* First we read the result */
0764de64	451	wl1251_mem_read(wl, wl->data_path->tx_complete_addr,
2f01a1f5 KV	452	result, sizeof(result));
	453
	454	result_index = wl->next_tx_complete;
	455
	456	for (i = 0; i < ARRAY_SIZE(result); i++) {
	457	result_ptr = &result[result_index];
	458
	459	if (result_ptr->done_1 == 1 &&
	460	result_ptr->done_2 == 1) {
9f2ad4fb	461	wl1251_tx_packet_cb(wl, result_ptr);
2f01a1f5 KV	462
	463	result_ptr->done_1 = 0;
	464	result_ptr->done_2 = 0;
	465
	466	result_index = (result_index + 1) &
	467	(FW_TX_CMPLT_BLOCK_SIZE - 1);
	468	num_complete++;
	469	} else {
	470	break;
	471	}
	472	}
	473
9df86e2e DGC	474	if (wl->tx_queue_stopped
	475	&&
	476	skb_queue_len(&wl->tx_queue) <= WL1251_TX_QUEUE_LOW_WATERMARK){
	477
	478	/* firmware buffer has space, restart queues */
	479	wl1251_debug(DEBUG_TX, "tx_complete: waking queues");
	480	spin_lock_irqsave(&wl->wl_lock, flags);
	481	ieee80211_wake_queues(wl->hw);
	482	wl->tx_queue_stopped = false;
	483	spin_unlock_irqrestore(&wl->wl_lock, flags);
	484	ieee80211_queue_work(wl->hw, &wl->tx_work);
	485
	486	}
	487
2f01a1f5 KV	488	/* Every completed frame needs to be acknowledged */
	489	if (num_complete) {
	490	/*
	491	* If we've wrapped, we have to clear
	492	* the results in 2 steps.
	493	*/
	494	if (result_index > wl->next_tx_complete) {
	495	/* Only 1 write is needed */
0764de64 BC	496	wl1251_mem_write(wl,
	497	wl->data_path->tx_complete_addr +
	498	(wl->next_tx_complete *
	499	sizeof(struct tx_result)),
	500	&result[wl->next_tx_complete],
	501	num_complete *
	502	sizeof(struct tx_result));
2f01a1f5 KV	503
	504
	505	} else if (result_index < wl->next_tx_complete) {
	506	/* 2 writes are needed */
0764de64 BC	507	wl1251_mem_write(wl,
	508	wl->data_path->tx_complete_addr +
	509	(wl->next_tx_complete *
	510	sizeof(struct tx_result)),
	511	&result[wl->next_tx_complete],
	512	(FW_TX_CMPLT_BLOCK_SIZE -
	513	wl->next_tx_complete) *
	514	sizeof(struct tx_result));
	515
	516	wl1251_mem_write(wl,
	517	wl->data_path->tx_complete_addr,
	518	result,
	519	(num_complete -
	520	FW_TX_CMPLT_BLOCK_SIZE +
	521	wl->next_tx_complete) *
	522	sizeof(struct tx_result));
2f01a1f5 KV	523
	524	} else {
	525	/* We have to write the whole array */
0764de64 BC	526	wl1251_mem_write(wl,
	527	wl->data_path->tx_complete_addr,
	528	result,
	529	FW_TX_CMPLT_BLOCK_SIZE *
	530	sizeof(struct tx_result));
2f01a1f5 KV	531	}
	532
	533	}
	534
	535	wl->next_tx_complete = result_index;
	536	}
	537
	538	/* caller must hold wl->mutex */
80301cdc	539	void wl1251_tx_flush(struct wl1251 *wl)
2f01a1f5 KV	540	{
	541	int i;
	542	struct sk_buff *skb;
	543	struct ieee80211_tx_info *info;
	544
	545	/* TX failure */
	546	/* control->flags = 0; FIXME */
	547
	548	while ((skb = skb_dequeue(&wl->tx_queue))) {
	549	info = IEEE80211_SKB_CB(skb);
	550
80301cdc	551	wl1251_debug(DEBUG_TX, "flushing skb 0x%p", skb);
2f01a1f5 KV	552
	553	if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
	554	continue;
	555
	556	ieee80211_tx_status(wl->hw, skb);
	557	}
	558
	559	for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
	560	if (wl->tx_frames[i] != NULL) {
	561	skb = wl->tx_frames[i];
	562	info = IEEE80211_SKB_CB(skb);
	563
	564	if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
	565	continue;
	566
	567	ieee80211_tx_status(wl->hw, skb);
	568	wl->tx_frames[i] = NULL;
	569	}
	570	}