drivers/net/wireless/mwifiex/sta_tx.c - arm/linux-arm-legacy - Git at Google

 /*
  * 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;
 	u16 pkt_type, pkt_offset;

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

 	pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;

 	/* 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 */
 	pkt_offset = sizeof(struct txpd) + pad;
 	if (pkt_type == PKT_TYPE_MGMT) {
 		/* Set the packet type and add header for management frame */
 		local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
 		pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
 	}

 	local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);

 	/* 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;
 	tx_info->pkt_len = data_len - (sizeof(struct txpd) + INTF_HEADER_LEN);
 	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;

 	if (adapter->iface_type == MWIFIEX_USB) {
 		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
 						   skb, NULL);
 	} else {
 		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;
 }
	/*
	* 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;
	u16 pkt_type, pkt_offset;

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

	pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;

	/* 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 */
	pkt_offset = sizeof(struct txpd) + pad;
	if (pkt_type == PKT_TYPE_MGMT) {
	/* Set the packet type and add header for management frame */
	local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
	pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
	}

	local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);

	/* 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;
	tx_info->pkt_len = data_len - (sizeof(struct txpd) + INTF_HEADER_LEN);
	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;

	if (adapter->iface_type == MWIFIEX_USB) {
	ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
	skb, NULL);
	} else {
	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;
	}