From 5e6e3a92b9a4c9416b17f468fa5c7fa2233b8b4e Mon Sep 17 00:00:00 2001 From: Bing Zhao Date: Mon, 21 Mar 2011 18:00:50 -0700 Subject: wireless: mwifiex: initial commit for Marvell mwifiex driver This driver adds WiFi support for Marvell 802.11n based chipsets with SDIO interface. Currently only SD8787 is supported. More chipsets will be supported later. drivers/net/wireless/mwifiex/ Signed-off-by: Nishant Sarmukadam Signed-off-by: Amitkumar Karwar Signed-off-by: Kiran Divekar Signed-off-by: Bing Zhao Signed-off-by: Yogesh Ashok Powar Signed-off-by: Marc Yang Signed-off-by: Ramesh Radhakrishnan Signed-off-by: Frank Huang Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/txrx.c | 202 ++++++++++++++++++++++++++++++++++++ 1 file changed, 202 insertions(+) create mode 100644 drivers/net/wireless/mwifiex/txrx.c (limited to 'drivers/net/wireless/mwifiex/txrx.c') diff --git a/drivers/net/wireless/mwifiex/txrx.c b/drivers/net/wireless/mwifiex/txrx.c new file mode 100644 index 000000000000..f06923cb1c4b --- /dev/null +++ b/drivers/net/wireless/mwifiex/txrx.c @@ -0,0 +1,202 @@ +/* + * Marvell Wireless LAN device driver: generic TX/RX 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 processes the received buffer. + * + * Main responsibility of this function is to parse the RxPD to + * identify the correct interface this packet is headed for and + * forwarding it to the associated handling function, where the + * packet will be further processed and sent to kernel/upper layer + * if required. + */ +int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter, + struct sk_buff *skb) +{ + int ret = 0; + struct mwifiex_private *priv = + mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY); + struct rxpd *local_rx_pd; + struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb); + + local_rx_pd = (struct rxpd *) (skb->data); + /* Get the BSS number from rxpd, get corresponding priv */ + priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num & + BSS_NUM_MASK, local_rx_pd->bss_type); + if (!priv) + priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY); + + rx_info->bss_index = priv->bss_index; + ret = mwifiex_process_sta_rx_packet(adapter, skb); + + return ret; +} +EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet); + +/* + * This function sends a packet to device. + * + * It processes the packet to add the TxPD, checks condition and + * sends the processed packet to firmware for transmission. + * + * On successful completion, the function calls the completion callback + * and logs the time. + */ +int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb, + struct mwifiex_tx_param *tx_param) +{ + int ret = -1; + struct mwifiex_adapter *adapter = priv->adapter; + u8 *head_ptr = NULL; + struct txpd *local_tx_pd = NULL; + + head_ptr = (u8 *) mwifiex_process_sta_txpd(priv, skb); + if (head_ptr) { + if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) + local_tx_pd = + (struct txpd *) (head_ptr + INTF_HEADER_LEN); + + ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, + skb->data, skb->len, tx_param); + } + + switch (ret) { + case -EBUSY: + if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) && + (adapter->pps_uapsd_mode) && + (adapter->tx_lock_flag)) { + priv->adapter->tx_lock_flag = false; + local_tx_pd->flags = 0; + } + dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); + break; + case -1: + adapter->data_sent = false; + dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n", + ret); + adapter->dbg.num_tx_host_to_card_failure++; + mwifiex_write_data_complete(adapter, skb, ret); + break; + case -EINPROGRESS: + adapter->data_sent = false; + break; + case 0: + mwifiex_write_data_complete(adapter, skb, ret); + break; + default: + break; + } + + return ret; +} + +/* + * Packet send completion callback handler. + * + * It either frees the buffer directly or forwards it to another + * completion callback which checks conditions, updates statistics, + * wakes up stalled traffic queue if required, and then frees the buffer. + */ +int mwifiex_write_data_complete(struct mwifiex_adapter *adapter, + struct sk_buff *skb, int status) +{ + struct mwifiex_private *priv = NULL, *tpriv = NULL; + struct mwifiex_txinfo *tx_info = NULL; + int i; + + if (!skb) + return 0; + + tx_info = MWIFIEX_SKB_TXCB(skb); + priv = mwifiex_bss_index_to_priv(adapter, tx_info->bss_index); + if (!priv) + goto done; + + priv->netdev->trans_start = jiffies; + if (!status) { + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len; + } else { + priv->stats.tx_errors++; + } + atomic_dec(&adapter->tx_pending); + + for (i = 0; i < adapter->priv_num; i++) { + + tpriv = adapter->priv[i]; + + if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA) + && (tpriv->media_connected)) { + if (netif_queue_stopped(tpriv->netdev)) + netif_wake_queue(tpriv->netdev); + } + } +done: + dev_kfree_skb_any(skb); + + return 0; +} + +/* + * Packet receive completion callback handler. + * + * This function calls another completion callback handler which + * updates the statistics, and optionally updates the parent buffer + * use count before freeing the received packet. + */ +int mwifiex_recv_packet_complete(struct mwifiex_adapter *adapter, + struct sk_buff *skb, int status) +{ + struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb); + struct mwifiex_rxinfo *rx_info_parent = NULL; + struct mwifiex_private *priv; + struct sk_buff *skb_parent = NULL; + unsigned long flags; + + priv = adapter->priv[rx_info->bss_index]; + + if (priv && (status == -1)) + priv->stats.rx_dropped++; + + if (rx_info->parent) { + skb_parent = rx_info->parent; + rx_info_parent = MWIFIEX_SKB_RXCB(skb_parent); + + spin_lock_irqsave(&priv->rx_pkt_lock, flags); + --rx_info_parent->use_count; + + if (!rx_info_parent->use_count) { + spin_unlock_irqrestore(&priv->rx_pkt_lock, flags); + dev_kfree_skb_any(skb_parent); + } else { + spin_unlock_irqrestore(&priv->rx_pkt_lock, flags); + } + } else { + dev_kfree_skb_any(skb); + } + + return 0; +} -- cgit v1.2.3 From 636c4598499eeacce0893dc8d91113b904bd531e Mon Sep 17 00:00:00 2001 From: Yogesh Ashok Powar Date: Fri, 15 Apr 2011 20:50:40 -0700 Subject: mwifiex: remove redundant local variables and comments Remove some local variables (mainly function return values) that are used only once. Also, one dummy function and some wordy comments are removed. Signed-off-by: Yogesh Ashok Powar Signed-off-by: Kiran Divekar Signed-off-by: Bing Zhao Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/txrx.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'drivers/net/wireless/mwifiex/txrx.c') diff --git a/drivers/net/wireless/mwifiex/txrx.c b/drivers/net/wireless/mwifiex/txrx.c index f06923cb1c4b..ce772e078db8 100644 --- a/drivers/net/wireless/mwifiex/txrx.c +++ b/drivers/net/wireless/mwifiex/txrx.c @@ -36,7 +36,6 @@ int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter, struct sk_buff *skb) { - int ret = 0; struct mwifiex_private *priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY); struct rxpd *local_rx_pd; @@ -50,9 +49,8 @@ int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter, priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY); rx_info->bss_index = priv->bss_index; - ret = mwifiex_process_sta_rx_packet(adapter, skb); - return ret; + return mwifiex_process_sta_rx_packet(adapter, skb); } EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet); -- cgit v1.2.3 From 270e58e8898c8be40451ebee45b6c9b5bd5db04b Mon Sep 17 00:00:00 2001 From: Yogesh Ashok Powar Date: Tue, 3 May 2011 20:11:46 -0700 Subject: mwifiex: remove unnecessary variable initialization Skip initialization of local variables with some default values if the values are not going to be used further down the code path. Signed-off-by: Yogesh Ashok Powar Signed-off-by: Bing Zhao Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/txrx.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/net/wireless/mwifiex/txrx.c') diff --git a/drivers/net/wireless/mwifiex/txrx.c b/drivers/net/wireless/mwifiex/txrx.c index ce772e078db8..210120889dfe 100644 --- a/drivers/net/wireless/mwifiex/txrx.c +++ b/drivers/net/wireless/mwifiex/txrx.c @@ -68,7 +68,7 @@ int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb, { int ret = -1; struct mwifiex_adapter *adapter = priv->adapter; - u8 *head_ptr = NULL; + u8 *head_ptr; struct txpd *local_tx_pd = NULL; head_ptr = (u8 *) mwifiex_process_sta_txpd(priv, skb); @@ -121,8 +121,8 @@ int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb, int mwifiex_write_data_complete(struct mwifiex_adapter *adapter, struct sk_buff *skb, int status) { - struct mwifiex_private *priv = NULL, *tpriv = NULL; - struct mwifiex_txinfo *tx_info = NULL; + struct mwifiex_private *priv, *tpriv; + struct mwifiex_txinfo *tx_info; int i; if (!skb) @@ -169,9 +169,9 @@ int mwifiex_recv_packet_complete(struct mwifiex_adapter *adapter, struct sk_buff *skb, int status) { struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb); - struct mwifiex_rxinfo *rx_info_parent = NULL; + struct mwifiex_rxinfo *rx_info_parent; struct mwifiex_private *priv; - struct sk_buff *skb_parent = NULL; + struct sk_buff *skb_parent; unsigned long flags; priv = adapter->priv[rx_info->bss_index]; -- cgit v1.2.3