1/*
  2 * Marvell Wireless LAN device driver: generic TX/RX 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 processes the received buffer.
 29 *
 30 * Main responsibility of this function is to parse the RxPD to
 31 * identify the correct interface this packet is headed for and
 32 * forwarding it to the associated handling function, where the
 33 * packet will be further processed and sent to kernel/upper layer
 34 * if required.
 35 */
 36int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
 37			     struct sk_buff *skb)
 38{
 39	struct mwifiex_private *priv =
 40		mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
 41	struct rxpd *local_rx_pd;
 42	struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 43	int ret;
 44
 45	local_rx_pd = (struct rxpd *) (skb->data);
 46	/* Get the BSS number from rxpd, get corresponding priv */
 47	priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num &
 48				      BSS_NUM_MASK, local_rx_pd->bss_type);
 49	if (!priv)
 50		priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
 51
 52	if (!priv) {
 53		dev_err(adapter->dev, "data: priv not found. Drop RX packet\n");
 54		dev_kfree_skb_any(skb);
 55		return -1;
 56	}
 57
 58	rx_info->bss_num = priv->bss_num;
 59	rx_info->bss_type = priv->bss_type;
 60
 61	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
 62		ret = mwifiex_process_uap_rx_packet(priv, skb);
 63	else
 64		ret = mwifiex_process_sta_rx_packet(priv, skb);
 65
 66	/* Decrement RX pending counter for each packet */
 67	if (adapter->if_ops.data_complete)
 68		adapter->if_ops.data_complete(adapter);
 69
 70	return ret;
 71}
 72EXPORT_SYMBOL_GPL(mwifiex_handle_rx_packet);
 73
 74/*
 75 * This function sends a packet to device.
 76 *
 77 * It processes the packet to add the TxPD, checks condition and
 78 * sends the processed packet to firmware for transmission.
 79 *
 80 * On successful completion, the function calls the completion callback
 81 * and logs the time.
 82 */
 83int mwifiex_process_tx(struct mwifiex_private *priv, struct sk_buff *skb,
 84		       struct mwifiex_tx_param *tx_param)
 85{
 86	int ret = -1;
 87	struct mwifiex_adapter *adapter = priv->adapter;
 88	u8 *head_ptr;
 89	struct txpd *local_tx_pd = NULL;
 90
 91	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
 92		head_ptr = mwifiex_process_uap_txpd(priv, skb);
 93	else
 94		head_ptr = mwifiex_process_sta_txpd(priv, skb);
 95
 96	if (head_ptr) {
 97		if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
 98			local_tx_pd =
 99				(struct txpd *) (head_ptr + INTF_HEADER_LEN);
100		if (adapter->iface_type == MWIFIEX_USB) {
101			adapter->data_sent = true;
102			skb_pull(skb, INTF_HEADER_LEN);
103			ret = adapter->if_ops.host_to_card(adapter,
104							   MWIFIEX_USB_EP_DATA,
105							   skb, NULL);
106		} else {
107			ret = adapter->if_ops.host_to_card(adapter,
108							   MWIFIEX_TYPE_DATA,
109							   skb, tx_param);
110		}
111	}
112
113	switch (ret) {
114	case -ENOSR:
115		dev_dbg(adapter->dev, "data: -ENOSR is returned\n");
116		break;
117	case -EBUSY:
118		if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
119		    (adapter->pps_uapsd_mode) && (adapter->tx_lock_flag)) {
120				priv->adapter->tx_lock_flag = false;
121				if (local_tx_pd)
122					local_tx_pd->flags = 0;
123		}
124		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
125		break;
126	case -1:
127		if (adapter->iface_type != MWIFIEX_PCIE)
128			adapter->data_sent = false;
129		dev_err(adapter->dev, "mwifiex_write_data_async failed: 0x%X\n",
130			ret);
131		adapter->dbg.num_tx_host_to_card_failure++;
132		mwifiex_write_data_complete(adapter, skb, 0, ret);
133		break;
134	case -EINPROGRESS:
135		if (adapter->iface_type != MWIFIEX_PCIE)
136			adapter->data_sent = false;
137		break;
138	case 0:
139		mwifiex_write_data_complete(adapter, skb, 0, ret);
140		break;
141	default:
142		break;
143	}
144
145	return ret;
146}
147
148/*
149 * Packet send completion callback handler.
150 *
151 * It either frees the buffer directly or forwards it to another
152 * completion callback which checks conditions, updates statistics,
153 * wakes up stalled traffic queue if required, and then frees the buffer.
154 */
155int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
156				struct sk_buff *skb, int aggr, int status)
157{
158	struct mwifiex_private *priv;
159	struct mwifiex_txinfo *tx_info;
160	struct netdev_queue *txq;
161	int index;
162
163	if (!skb)
164		return 0;
165
166	tx_info = MWIFIEX_SKB_TXCB(skb);
167	priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
168				      tx_info->bss_type);
169	if (!priv)
170		goto done;
171
172	if (adapter->iface_type == MWIFIEX_USB)
173		adapter->data_sent = false;
174
175	mwifiex_set_trans_start(priv->netdev);
176	if (!status) {
177		priv->stats.tx_packets++;
178		priv->stats.tx_bytes += tx_info->pkt_len;
179		if (priv->tx_timeout_cnt)
180			priv->tx_timeout_cnt = 0;
181	} else {
182		priv->stats.tx_errors++;
183	}
184
185	if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
186		atomic_dec_return(&adapter->pending_bridged_pkts);
187
188	if (aggr)
189		/* For skb_aggr, do not wake up tx queue */
190		goto done;
191
192	atomic_dec(&adapter->tx_pending);
193
194	index = mwifiex_1d_to_wmm_queue[skb->priority];
195	if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) {
196		txq = netdev_get_tx_queue(priv->netdev, index);
197		if (netif_tx_queue_stopped(txq)) {
198			netif_tx_wake_queue(txq);
199			dev_dbg(adapter->dev, "wake queue: %d\n", index);
200		}
201	}
202done:
203	dev_kfree_skb_any(skb);
204
205	return 0;
206}
207EXPORT_SYMBOL_GPL(mwifiex_write_data_complete);
208