[deliverable/linux.git] / drivers / net / wireless / mwifiex / sta_tx.c

/*
 * Marvell Wireless LAN device driver: station TX data handling
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"

/*
 * This function fills the TxPD for tx packets.
 *
 * The Tx buffer received by this function should already have the
 * header space allocated for TxPD.
 *
 * This function inserts the TxPD in between interface header and actual
 * data and adjusts the buffer pointers accordingly.
 *
 * The following TxPD fields are set by this function, as required -
 *      - BSS number
 *      - Tx packet length and offset
 *      - Priority
 *      - Packet delay
 *      - Priority specific Tx control
 *      - Flags
 */
void *mwifiex_process_sta_txpd(struct mwifiex_private *priv,
				struct sk_buff *skb)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct txpd *local_tx_pd;
	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
	u8 pad;

	if (!skb->len) {
		dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
		tx_info->status_code = -1;
		return skb->data;
	}

	/* If skb->data is not aligned; add padding */
	pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;

	BUG_ON(skb_headroom(skb) < (sizeof(*local_tx_pd) + INTF_HEADER_LEN
				    + pad));
	skb_push(skb, sizeof(*local_tx_pd) + pad);

	local_tx_pd = (struct txpd *) skb->data;
	memset(local_tx_pd, 0, sizeof(struct txpd));
	local_tx_pd->bss_num = priv->bss_num;
	local_tx_pd->bss_type = priv->bss_type;
	local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len -
						       (sizeof(struct txpd)
							+ pad)));

	local_tx_pd->priority = (u8) skb->priority;
	local_tx_pd->pkt_delay_2ms =
				mwifiex_wmm_compute_drv_pkt_delay(priv, skb);

	if (local_tx_pd->priority <
	    ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
		/*
		 * Set the priority specific tx_control field, setting of 0 will
		 *   cause the default value to be used later in this function
		 */
		local_tx_pd->tx_control =
			cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
								   priority]);

	if (adapter->pps_uapsd_mode) {
		if (mwifiex_check_last_packet_indication(priv)) {
			adapter->tx_lock_flag = true;
			local_tx_pd->flags =
				MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
		}
	}

	/* Offset of actual data */
	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) + pad);

	/* make space for INTF_HEADER_LEN */
	skb_push(skb, INTF_HEADER_LEN);

	if (!local_tx_pd->tx_control)
		/* TxCtrl set by user or default */
		local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);

	return skb->data;
}

/*
 * This function tells firmware to send a NULL data packet.
 *
 * The function creates a NULL data packet with TxPD and sends to the
 * firmware for transmission, with highest priority setting.
 */
int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct txpd *local_tx_pd;
/* sizeof(struct txpd) + Interface specific header */
#define NULL_PACKET_HDR 64
	u32 data_len = NULL_PACKET_HDR;
	struct sk_buff *skb;
	int ret;
	struct mwifiex_txinfo *tx_info = NULL;

	if (adapter->surprise_removed)
		return -1;

	if (!priv->media_connected)
		return -1;

	if (adapter->data_sent)
		return -1;

	skb = dev_alloc_skb(data_len);
	if (!skb)
		return -1;

	tx_info = MWIFIEX_SKB_TXCB(skb);
	tx_info->bss_num = priv->bss_num;
	tx_info->bss_type = priv->bss_type;
	skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
	skb_push(skb, sizeof(struct txpd));

	local_tx_pd = (struct txpd *) skb->data;
	local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
	local_tx_pd->flags = flags;
	local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
	local_tx_pd->bss_num = priv->bss_num;
	local_tx_pd->bss_type = priv->bss_type;

	skb_push(skb, INTF_HEADER_LEN);

	ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
					   skb, NULL);
	switch (ret) {
	case -EBUSY:
		adapter->data_sent = true;
		/* Fall through FAILURE handling */
	case -1:
		dev_kfree_skb_any(skb);
		dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
			__func__, ret);
		adapter->dbg.num_tx_host_to_card_failure++;
		break;
	case 0:
		dev_kfree_skb_any(skb);
		dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
			__func__);
		adapter->tx_lock_flag = true;
		break;
	case -EINPROGRESS:
		break;
	default:
		break;
	}

	return ret;
}

/*
 * This function checks if we need to send last packet indication.
 */
u8
mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	u8 ret = false;

	if (!adapter->sleep_period.period)
		return ret;
	if (mwifiex_wmm_lists_empty(adapter))
			ret = true;

	if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
	    !is_command_pending(adapter)) {
		adapter->delay_null_pkt = false;
		ret = true;
	} else {
		ret = false;
		adapter->delay_null_pkt = true;
	}
	return ret;
}
Commit	Line	Data
5e6e3a92 BZ	1	/*
	2	* Marvell Wireless LAN device driver: station TX data handling
	3	*
	4	* Copyright (C) 2011, Marvell International Ltd.
	5	*
	6	* This software file (the "File") is distributed by Marvell International
	7	* Ltd. under the terms of the GNU General Public License Version 2, June 1991
	8	* (the "License"). You may use, redistribute and/or modify this File in
	9	* accordance with the terms and conditions of the License, a copy of which
	10	* is available by writing to the Free Software Foundation, Inc.,
	11	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
	12	* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
	13	*
	14	* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
	16	* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
	17	* this warranty disclaimer.
	18	*/
	19
	20	#include "decl.h"
	21	#include "ioctl.h"
	22	#include "util.h"
	23	#include "fw.h"
	24	#include "main.h"
	25	#include "wmm.h"
	26
	27	/*
	28	* This function fills the TxPD for tx packets.
	29	*
	30	* The Tx buffer received by this function should already have the
	31	* header space allocated for TxPD.
	32	*
	33	* This function inserts the TxPD in between interface header and actual
	34	* data and adjusts the buffer pointers accordingly.
	35	*
	36	* The following TxPD fields are set by this function, as required -
	37	* - BSS number
	38	* - Tx packet length and offset
	39	* - Priority
	40	* - Packet delay
	41	* - Priority specific Tx control
	42	* - Flags
	43	*/
	44	void mwifiex_process_sta_txpd(struct mwifiex_private priv,
	45	struct sk_buff *skb)
	46	{
	47	struct mwifiex_adapter *adapter = priv->adapter;
	48	struct txpd *local_tx_pd;
	49	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
e156103c	50	u8 pad;
5e6e3a92 BZ	51
5e6e3a92 BZ	52	if (!skb->len) {
c65a30f3	53	dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
600f5d90	54	tx_info->status_code = -1;
5e6e3a92 BZ	55	return skb->data;
	56	}
	57
e156103c YAP	58	/* If skb->data is not aligned; add padding */
	59	pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
	60
	61	BUG_ON(skb_headroom(skb) < (sizeof(*local_tx_pd) + INTF_HEADER_LEN
c65a30f3	62	+ pad));
e156103c	63	skb_push(skb, sizeof(*local_tx_pd) + pad);
5e6e3a92 BZ	64
	65	local_tx_pd = (struct txpd *) skb->data;
	66	memset(local_tx_pd, 0, sizeof(struct txpd));
	67	local_tx_pd->bss_num = priv->bss_num;
	68	local_tx_pd->bss_type = priv->bss_type;
c65a30f3 YAP	69	local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len -
	70	(sizeof(struct txpd)
	71	+ pad)));
5e6e3a92 BZ	72
	73	local_tx_pd->priority = (u8) skb->priority;
	74	local_tx_pd->pkt_delay_2ms =
c65a30f3	75	mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
5e6e3a92 BZ	76
	77	if (local_tx_pd->priority <
	78	ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
	79	/*
	80	* Set the priority specific tx_control field, setting of 0 will
	81	* cause the default value to be used later in this function
	82	*/
	83	local_tx_pd->tx_control =
	84	cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
c65a30f3	85	priority]);
5e6e3a92 BZ	86
	87	if (adapter->pps_uapsd_mode) {
	88	if (mwifiex_check_last_packet_indication(priv)) {
	89	adapter->tx_lock_flag = true;
	90	local_tx_pd->flags =
	91	MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
	92	}
	93	}
	94
	95	/* Offset of actual data */
e156103c	96	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) + pad);
5e6e3a92 BZ	97
	98	/* make space for INTF_HEADER_LEN */
	99	skb_push(skb, INTF_HEADER_LEN);
	100
	101	if (!local_tx_pd->tx_control)
	102	/* TxCtrl set by user or default */
	103	local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
	104
	105	return skb->data;
	106	}
	107
	108	/*
	109	* This function tells firmware to send a NULL data packet.
	110	*
	111	* The function creates a NULL data packet with TxPD and sends to the
	112	* firmware for transmission, with highest priority setting.
	113	*/
	114	int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
	115	{
	116	struct mwifiex_adapter *adapter = priv->adapter;
	117	struct txpd *local_tx_pd;
	118	/* sizeof(struct txpd) + Interface specific header */
	119	#define NULL_PACKET_HDR 64
	120	u32 data_len = NULL_PACKET_HDR;
270e58e8 YAP	121	struct sk_buff *skb;
270e58e8 YAP	122	int ret;
5e6e3a92 BZ	123	struct mwifiex_txinfo *tx_info = NULL;
	124
	125	if (adapter->surprise_removed)
	126	return -1;
	127
	128	if (!priv->media_connected)
	129	return -1;
	130
	131	if (adapter->data_sent)
	132	return -1;
	133
	134	skb = dev_alloc_skb(data_len);
	135	if (!skb)
	136	return -1;
	137
	138	tx_info = MWIFIEX_SKB_TXCB(skb);
9da9a3b2 YAP	139	tx_info->bss_num = priv->bss_num;
9da9a3b2 YAP	140	tx_info->bss_type = priv->bss_type;
5e6e3a92 BZ	141	skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
	142	skb_push(skb, sizeof(struct txpd));
	143
	144	local_tx_pd = (struct txpd *) skb->data;
	145	local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
	146	local_tx_pd->flags = flags;
	147	local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
	148	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
	149	local_tx_pd->bss_num = priv->bss_num;
	150	local_tx_pd->bss_type = priv->bss_type;
	151
	152	skb_push(skb, INTF_HEADER_LEN);
	153
	154	ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
d930faee	155	skb, NULL);
5e6e3a92 BZ	156	switch (ret) {
	157	case -EBUSY:
	158	adapter->data_sent = true;
	159	/* Fall through FAILURE handling */
	160	case -1:
	161	dev_kfree_skb_any(skb);
	162	dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
c65a30f3	163	__func__, ret);
5e6e3a92 BZ	164	adapter->dbg.num_tx_host_to_card_failure++;
	165	break;
	166	case 0:
	167	dev_kfree_skb_any(skb);
	168	dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
c65a30f3	169	__func__);
5e6e3a92 BZ	170	adapter->tx_lock_flag = true;
	171	break;
	172	case -EINPROGRESS:
	173	break;
	174	default:
	175	break;
	176	}
	177
	178	return ret;
	179	}
	180
	181	/*
	182	* This function checks if we need to send last packet indication.
	183	*/
	184	u8
	185	mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
	186	{
	187	struct mwifiex_adapter *adapter = priv->adapter;
	188	u8 ret = false;
5e6e3a92 BZ	189
	190	if (!adapter->sleep_period.period)
	191	return ret;
636c4598	192	if (mwifiex_wmm_lists_empty(adapter))
5e6e3a92	193	ret = true;
5e6e3a92	194
c65a30f3 YAP	195	if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
c65a30f3 YAP	196	!is_command_pending(adapter)) {
5e6e3a92 BZ	197	adapter->delay_null_pkt = false;
	198	ret = true;
	199	} else {
	200	ret = false;
	201	adapter->delay_null_pkt = true;
	202	}
	203	return ret;
	204	}