[mirror_ubuntu-artful-kernel.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
 *
 * Contact: Kalle Valo <kalle.valo@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 "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) {
			/* firmware buffer is full, stop queues */
			wl1251_debug(DEBUG_TX, "tx_work: fw buffer full, "
				     "stop queues");
			ieee80211_stop_queues(wl->hw);
			wl->tx_queue_stopped = true;
			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;

	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;
		}
	}

	/* 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	*
	7	* Contact: Kalle Valo <kalle.valo@nokia.com>
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* version 2 as published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	21	* 02110-1301 USA
	22	*
	23	*/
	24
	25	#include <linux/kernel.h>
	26	#include <linux/module.h>
	27
13674118	28	#include "wl1251.h"
29d904c4	29	#include "wl1251_reg.h"
9f2ad4fb	30	#include "wl1251_tx.h"
ef2f8d45	31	#include "wl1251_ps.h"
0764de64	32	#include "wl1251_io.h"
2f01a1f5	33
80301cdc	34	static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count)
2f01a1f5 KV	35	{
	36	int used, data_in_count;
	37
	38	data_in_count = wl->data_in_count;
	39
	40	if (data_in_count < data_out_count)
	41	/* data_in_count has wrapped */
	42	data_in_count += TX_STATUS_DATA_OUT_COUNT_MASK + 1;
	43
	44	used = data_in_count - data_out_count;
	45
	46	WARN_ON(used < 0);
	47	WARN_ON(used > DP_TX_PACKET_RING_CHUNK_NUM);
	48
	49	if (used >= DP_TX_PACKET_RING_CHUNK_NUM)
	50	return true;
	51	else
	52	return false;
	53	}
	54
80301cdc	55	static int wl1251_tx_path_status(struct wl1251 *wl)
2f01a1f5 KV	56	{
	57	u32 status, addr, data_out_count;
	58	bool busy;
	59
	60	addr = wl->data_path->tx_control_addr;
80301cdc	61	status = wl1251_mem_read32(wl, addr);
2f01a1f5	62	data_out_count = status & TX_STATUS_DATA_OUT_COUNT_MASK;
9f2ad4fb	63	busy = wl1251_tx_double_buffer_busy(wl, data_out_count);
2f01a1f5 KV	64
	65	if (busy)
	66	return -EBUSY;
	67
	68	return 0;
	69	}
	70
80301cdc	71	static int wl1251_tx_id(struct wl1251 wl, struct sk_buff skb)
2f01a1f5 KV	72	{
	73	int i;
	74
	75	for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
	76	if (wl->tx_frames[i] == NULL) {
	77	wl->tx_frames[i] = skb;
	78	return i;
	79	}
	80
	81	return -EBUSY;
	82	}
	83
9f2ad4fb	84	static void wl1251_tx_control(struct tx_double_buffer_desc *tx_hdr,
2f01a1f5 KV	85	struct ieee80211_tx_info *control, u16 fc)
	86	{
	87	(u16 )&tx_hdr->control = 0;
	88
	89	tx_hdr->control.rate_policy = 0;
	90
	91	/* 802.11 packets */
	92	tx_hdr->control.packet_type = 0;
	93
	94	if (control->flags & IEEE80211_TX_CTL_NO_ACK)
	95	tx_hdr->control.ack_policy = 1;
	96
	97	tx_hdr->control.tx_complete = 1;
	98
	99	if ((fc & IEEE80211_FTYPE_DATA) &&
	100	((fc & IEEE80211_STYPE_QOS_DATA) \|\|
	101	(fc & IEEE80211_STYPE_QOS_NULLFUNC)))
	102	tx_hdr->control.qos = 1;
	103	}
	104
	105	/* RSN + MIC = 8 + 8 = 16 bytes (worst case - AES). */
	106	#define MAX_MSDU_SECURITY_LENGTH 16
	107	#define MAX_MPDU_SECURITY_LENGTH 16
	108	#define WLAN_QOS_HDR_LEN 26
	109	#define MAX_MPDU_HEADER_AND_SECURITY (MAX_MPDU_SECURITY_LENGTH + \
	110	WLAN_QOS_HDR_LEN)
	111	#define HW_BLOCK_SIZE 252
9f2ad4fb	112	static void wl1251_tx_frag_block_num(struct tx_double_buffer_desc *tx_hdr)
2f01a1f5 KV	113	{
	114	u16 payload_len, frag_threshold, mem_blocks;
	115	u16 num_mpdus, mem_blocks_per_frag;
	116
	117	frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
	118	tx_hdr->frag_threshold = cpu_to_le16(frag_threshold);
	119
1ab36d68	120	payload_len = le16_to_cpu(tx_hdr->length) + MAX_MSDU_SECURITY_LENGTH;
2f01a1f5 KV	121
	122	if (payload_len > frag_threshold) {
	123	mem_blocks_per_frag =
	124	((frag_threshold + MAX_MPDU_HEADER_AND_SECURITY) /
	125	HW_BLOCK_SIZE) + 1;
	126	num_mpdus = payload_len / frag_threshold;
	127	mem_blocks = num_mpdus * mem_blocks_per_frag;
	128	payload_len -= num_mpdus * frag_threshold;
	129	num_mpdus++;
	130
	131	} else {
	132	mem_blocks_per_frag = 0;
	133	mem_blocks = 0;
	134	num_mpdus = 1;
	135	}
	136
	137	mem_blocks += (payload_len / HW_BLOCK_SIZE) + 1;
	138
	139	if (num_mpdus > 1)
	140	mem_blocks += min(num_mpdus, mem_blocks_per_frag);
	141
	142	tx_hdr->num_mem_blocks = mem_blocks;
	143	}
	144
80301cdc	145	static int wl1251_tx_fill_hdr(struct wl1251 wl, struct sk_buff skb,
2f01a1f5 KV	146	struct ieee80211_tx_info *control)
	147	{
	148	struct tx_double_buffer_desc *tx_hdr;
	149	struct ieee80211_rate *rate;
	150	int id;
	151	u16 fc;
	152
	153	if (!skb)
	154	return -EINVAL;
	155
9f2ad4fb	156	id = wl1251_tx_id(wl, skb);
2f01a1f5 KV	157	if (id < 0)
	158	return id;
	159
	160	fc = (u16 )skb->data;
	161	tx_hdr = (struct tx_double_buffer_desc *) skb_push(skb,
	162	sizeof(*tx_hdr));
	163
	164	tx_hdr->length = cpu_to_le16(skb->len - sizeof(*tx_hdr));
	165	rate = ieee80211_get_tx_rate(wl->hw, control);
	166	tx_hdr->rate = cpu_to_le16(rate->hw_value);
	167	tx_hdr->expiry_time = cpu_to_le32(1 << 16);
	168	tx_hdr->id = id;
	169
49e1b9fa	170	tx_hdr->xmit_queue = wl1251_tx_get_queue(skb_get_queue_mapping(skb));
2f01a1f5	171
9f2ad4fb JO	172	wl1251_tx_control(tx_hdr, control, fc);
9f2ad4fb JO	173	wl1251_tx_frag_block_num(tx_hdr);
2f01a1f5 KV	174
	175	return 0;
	176	}
	177
	178	/* We copy the packet to the target */
80301cdc	179	static int wl1251_tx_send_packet(struct wl1251 wl, struct sk_buff skb,
2f01a1f5 KV	180	struct ieee80211_tx_info *control)
	181	{
	182	struct tx_double_buffer_desc *tx_hdr;
	183	int len;
	184	u32 addr;
	185
	186	if (!skb)
	187	return -EINVAL;
	188
	189	tx_hdr = (struct tx_double_buffer_desc *) skb->data;
	190
	191	if (control->control.hw_key &&
97359d12	192	control->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
2f01a1f5	193	int hdrlen;
1ab36d68 JL	194	__le16 fc;
1ab36d68 JL	195	u16 length;
2f01a1f5 KV	196	u8 *pos;
2f01a1f5 KV	197
1ab36d68 JL	198	fc = (__le16 )(skb->data + sizeof(*tx_hdr));
	199	length = le16_to_cpu(tx_hdr->length) + WL1251_TKIP_IV_SPACE;
	200	tx_hdr->length = cpu_to_le16(length);
2f01a1f5 KV	201
	202	hdrlen = ieee80211_hdrlen(fc);
	203
9f2ad4fb JO	204	pos = skb_push(skb, WL1251_TKIP_IV_SPACE);
9f2ad4fb JO	205	memmove(pos, pos + WL1251_TKIP_IV_SPACE,
2f01a1f5 KV	206	sizeof(*tx_hdr) + hdrlen);
	207	}
	208
	209	/* Revisit. This is a workaround for getting non-aligned packets.
	210	This happens at least with EAPOL packets from the user space.
	211	Our DMA requires packets to be aligned on a 4-byte boundary.
	212	*/
	213	if (unlikely((long)skb->data & 0x03)) {
	214	int offset = (4 - (long)skb->data) & 0x03;
80301cdc	215	wl1251_debug(DEBUG_TX, "skb offset %d", offset);
2f01a1f5 KV	216
	217	/* check whether the current skb can be used */
	218	if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
	219	unsigned char *src = skb->data;
	220
	221	/* align the buffer on a 4-byte boundary */
	222	skb_reserve(skb, offset);
	223	memmove(skb->data, src, skb->len);
46cb35f5	224	tx_hdr = (struct tx_double_buffer_desc *) skb->data;
2f01a1f5	225	} else {
80301cdc	226	wl1251_info("No handler, fixme!");
2f01a1f5 KV	227	return -EINVAL;
	228	}
	229	}
	230
	231	/* Our skb->data at this point includes the HW header */
9f2ad4fb	232	len = WL1251_TX_ALIGN(skb->len);
2f01a1f5 KV	233
	234	if (wl->data_in_count & 0x1)
	235	addr = wl->data_path->tx_packet_ring_addr +
	236	wl->data_path->tx_packet_ring_chunk_size;
	237	else
	238	addr = wl->data_path->tx_packet_ring_addr;
	239
0764de64	240	wl1251_mem_write(wl, addr, skb->data, len);
2f01a1f5	241
49e1b9fa KV	242	wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x "
	243	"queue %d", tx_hdr->id, skb, tx_hdr->length,
	244	tx_hdr->rate, tx_hdr->xmit_queue);
2f01a1f5 KV	245
	246	return 0;
	247	}
	248
80301cdc	249	static void wl1251_tx_trigger(struct wl1251 *wl)
2f01a1f5 KV	250	{
	251	u32 data, addr;
	252
	253	if (wl->data_in_count & 0x1) {
	254	addr = ACX_REG_INTERRUPT_TRIG_H;
	255	data = INTR_TRIG_TX_PROC1;
	256	} else {
	257	addr = ACX_REG_INTERRUPT_TRIG;
	258	data = INTR_TRIG_TX_PROC0;
	259	}
	260
80301cdc	261	wl1251_reg_write32(wl, addr, data);
2f01a1f5 KV	262
	263	/* Bumping data in */
	264	wl->data_in_count = (wl->data_in_count + 1) &
	265	TX_STATUS_DATA_OUT_COUNT_MASK;
	266	}
	267
	268	/* caller must hold wl->mutex */
80301cdc	269	static int wl1251_tx_frame(struct wl1251 wl, struct sk_buff skb)
2f01a1f5 KV	270	{
	271	struct ieee80211_tx_info *info;
	272	int ret = 0;
	273	u8 idx;
	274
	275	info = IEEE80211_SKB_CB(skb);
	276
	277	if (info->control.hw_key) {
	278	idx = info->control.hw_key->hw_key_idx;
	279	if (unlikely(wl->default_key != idx)) {
80301cdc	280	ret = wl1251_acx_default_key(wl, idx);
2f01a1f5 KV	281	if (ret < 0)
	282	return ret;
	283	}
	284	}
	285
9f2ad4fb	286	ret = wl1251_tx_path_status(wl);
2f01a1f5 KV	287	if (ret < 0)
	288	return ret;
	289
9f2ad4fb	290	ret = wl1251_tx_fill_hdr(wl, skb, info);
2f01a1f5 KV	291	if (ret < 0)
	292	return ret;
	293
9f2ad4fb	294	ret = wl1251_tx_send_packet(wl, skb, info);
2f01a1f5 KV	295	if (ret < 0)
	296	return ret;
	297
9f2ad4fb	298	wl1251_tx_trigger(wl);
2f01a1f5 KV	299
	300	return ret;
	301	}
	302
9f2ad4fb	303	void wl1251_tx_work(struct work_struct *work)
2f01a1f5	304	{
80301cdc	305	struct wl1251 *wl = container_of(work, struct wl1251, tx_work);
2f01a1f5 KV	306	struct sk_buff *skb;
	307	bool woken_up = false;
	308	int ret;
	309
	310	mutex_lock(&wl->mutex);
	311
80301cdc	312	if (unlikely(wl->state == WL1251_STATE_OFF))
2f01a1f5 KV	313	goto out;
	314
	315	while ((skb = skb_dequeue(&wl->tx_queue))) {
	316	if (!woken_up) {
80301cdc	317	ret = wl1251_ps_elp_wakeup(wl);
c5483b71 KV	318	if (ret < 0)
c5483b71 KV	319	goto out;
2f01a1f5 KV	320	woken_up = true;
	321	}
	322
9f2ad4fb	323	ret = wl1251_tx_frame(wl, skb);
2f01a1f5 KV	324	if (ret == -EBUSY) {
2f01a1f5 KV	325	/* firmware buffer is full, stop queues */
80301cdc	326	wl1251_debug(DEBUG_TX, "tx_work: fw buffer full, "
2f01a1f5 KV	327	"stop queues");
	328	ieee80211_stop_queues(wl->hw);
	329	wl->tx_queue_stopped = true;
	330	skb_queue_head(&wl->tx_queue, skb);
	331	goto out;
	332	} else if (ret < 0) {
	333	dev_kfree_skb(skb);
	334	goto out;
	335	}
	336	}
	337
	338	out:
	339	if (woken_up)
80301cdc	340	wl1251_ps_elp_sleep(wl);
2f01a1f5 KV	341
	342	mutex_unlock(&wl->mutex);
	343	}
	344
9f2ad4fb	345	static const char *wl1251_tx_parse_status(u8 status)
2f01a1f5 KV	346	{
	347	/* 8 bit status field, one character per bit plus null */
	348	static char buf[9];
	349	int i = 0;
	350
	351	memset(buf, 0, sizeof(buf));
	352
	353	if (status & TX_DMA_ERROR)
	354	buf[i++] = 'm';
	355	if (status & TX_DISABLED)
	356	buf[i++] = 'd';
	357	if (status & TX_RETRY_EXCEEDED)
	358	buf[i++] = 'r';
	359	if (status & TX_TIMEOUT)
	360	buf[i++] = 't';
	361	if (status & TX_KEY_NOT_FOUND)
	362	buf[i++] = 'k';
	363	if (status & TX_ENCRYPT_FAIL)
	364	buf[i++] = 'e';
	365	if (status & TX_UNAVAILABLE_PRIORITY)
	366	buf[i++] = 'p';
	367
	368	/* bit 0 is unused apparently */
	369
	370	return buf;
	371	}
	372
80301cdc	373	static void wl1251_tx_packet_cb(struct wl1251 *wl,
2f01a1f5 KV	374	struct tx_result *result)
	375	{
	376	struct ieee80211_tx_info *info;
	377	struct sk_buff *skb;
	378	int hdrlen, ret;
	379	u8 *frame;
	380
	381	skb = wl->tx_frames[result->id];
	382	if (skb == NULL) {
80301cdc	383	wl1251_error("SKB for packet %d is NULL", result->id);
2f01a1f5 KV	384	return;
	385	}
	386
	387	info = IEEE80211_SKB_CB(skb);
	388
	389	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
	390	(result->status == TX_SUCCESS))
	391	info->flags \|= IEEE80211_TX_STAT_ACK;
	392
	393	info->status.rates[0].count = result->ack_failures + 1;
	394	wl->stats.retry_count += result->ack_failures;
	395
	396	/*
	397	* We have to remove our private TX header before pushing
	398	* the skb back to mac80211.
	399	*/
	400	frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc));
	401	if (info->control.hw_key &&
97359d12	402	info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
2f01a1f5	403	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
9f2ad4fb JO	404	memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen);
9f2ad4fb JO	405	skb_pull(skb, WL1251_TKIP_IV_SPACE);
2f01a1f5 KV	406	}
2f01a1f5 KV	407
80301cdc	408	wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
2f01a1f5 KV	409	" status 0x%x (%s)",
2f01a1f5 KV	410	result->id, skb, result->ack_failures, result->rate,
9f2ad4fb	411	result->status, wl1251_tx_parse_status(result->status));
2f01a1f5 KV	412
	413
	414	ieee80211_tx_status(wl->hw, skb);
	415
	416	wl->tx_frames[result->id] = NULL;
	417
	418	if (wl->tx_queue_stopped) {
80301cdc	419	wl1251_debug(DEBUG_TX, "cb: queue was stopped");
2f01a1f5 KV	420
	421	skb = skb_dequeue(&wl->tx_queue);
	422
	423	/* The skb can be NULL because tx_work might have been
	424	scheduled before the queue was stopped making the
	425	queue empty */
	426
	427	if (skb) {
9f2ad4fb	428	ret = wl1251_tx_frame(wl, skb);
2f01a1f5 KV	429	if (ret == -EBUSY) {
2f01a1f5 KV	430	/* firmware buffer is still full */
80301cdc	431	wl1251_debug(DEBUG_TX, "cb: fw buffer "
2f01a1f5 KV	432	"still full");
	433	skb_queue_head(&wl->tx_queue, skb);
	434	return;
	435	} else if (ret < 0) {
	436	dev_kfree_skb(skb);
	437	return;
	438	}
	439	}
	440
80301cdc	441	wl1251_debug(DEBUG_TX, "cb: waking queues");
2f01a1f5 KV	442	ieee80211_wake_queues(wl->hw);
	443	wl->tx_queue_stopped = false;
	444	}
	445	}
	446
	447	/* Called upon reception of a TX complete interrupt */
80301cdc	448	void wl1251_tx_complete(struct wl1251 *wl)
2f01a1f5 KV	449	{
	450	int i, result_index, num_complete = 0;
	451	struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
	452
80301cdc	453	if (unlikely(wl->state != WL1251_STATE_ON))
2f01a1f5 KV	454	return;
	455
	456	/* First we read the result */
0764de64	457	wl1251_mem_read(wl, wl->data_path->tx_complete_addr,
2f01a1f5 KV	458	result, sizeof(result));
	459
	460	result_index = wl->next_tx_complete;
	461
	462	for (i = 0; i < ARRAY_SIZE(result); i++) {
	463	result_ptr = &result[result_index];
	464
	465	if (result_ptr->done_1 == 1 &&
	466	result_ptr->done_2 == 1) {
9f2ad4fb	467	wl1251_tx_packet_cb(wl, result_ptr);
2f01a1f5 KV	468
	469	result_ptr->done_1 = 0;
	470	result_ptr->done_2 = 0;
	471
	472	result_index = (result_index + 1) &
	473	(FW_TX_CMPLT_BLOCK_SIZE - 1);
	474	num_complete++;
	475	} else {
	476	break;
	477	}
	478	}
	479
	480	/* Every completed frame needs to be acknowledged */
	481	if (num_complete) {
	482	/*
	483	* If we've wrapped, we have to clear
	484	* the results in 2 steps.
	485	*/
	486	if (result_index > wl->next_tx_complete) {
	487	/* Only 1 write is needed */
0764de64 BC	488	wl1251_mem_write(wl,
	489	wl->data_path->tx_complete_addr +
	490	(wl->next_tx_complete *
	491	sizeof(struct tx_result)),
	492	&result[wl->next_tx_complete],
	493	num_complete *
	494	sizeof(struct tx_result));
2f01a1f5 KV	495
	496
	497	} else if (result_index < wl->next_tx_complete) {
	498	/* 2 writes are needed */
0764de64 BC	499	wl1251_mem_write(wl,
	500	wl->data_path->tx_complete_addr +
	501	(wl->next_tx_complete *
	502	sizeof(struct tx_result)),
	503	&result[wl->next_tx_complete],
	504	(FW_TX_CMPLT_BLOCK_SIZE -
	505	wl->next_tx_complete) *
	506	sizeof(struct tx_result));
	507
	508	wl1251_mem_write(wl,
	509	wl->data_path->tx_complete_addr,
	510	result,
	511	(num_complete -
	512	FW_TX_CMPLT_BLOCK_SIZE +
	513	wl->next_tx_complete) *
	514	sizeof(struct tx_result));
2f01a1f5 KV	515
	516	} else {
	517	/* We have to write the whole array */
0764de64 BC	518	wl1251_mem_write(wl,
	519	wl->data_path->tx_complete_addr,
	520	result,
	521	FW_TX_CMPLT_BLOCK_SIZE *
	522	sizeof(struct tx_result));
2f01a1f5 KV	523	}
	524
	525	}
	526
	527	wl->next_tx_complete = result_index;
	528	}
	529
	530	/* caller must hold wl->mutex */
80301cdc	531	void wl1251_tx_flush(struct wl1251 *wl)
2f01a1f5 KV	532	{
	533	int i;
	534	struct sk_buff *skb;
	535	struct ieee80211_tx_info *info;
	536
	537	/* TX failure */
	538	/* control->flags = 0; FIXME */
	539
	540	while ((skb = skb_dequeue(&wl->tx_queue))) {
	541	info = IEEE80211_SKB_CB(skb);
	542
80301cdc	543	wl1251_debug(DEBUG_TX, "flushing skb 0x%p", skb);
2f01a1f5 KV	544
	545	if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
	546	continue;
	547
	548	ieee80211_tx_status(wl->hw, skb);
	549	}
	550
	551	for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
	552	if (wl->tx_frames[i] != NULL) {
	553	skb = wl->tx_frames[i];
	554	info = IEEE80211_SKB_CB(skb);
	555
	556	if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
	557	continue;
	558
	559	ieee80211_tx_status(wl->hw, skb);
	560	wl->tx_frames[i] = NULL;
	561	}
	562	}