1 /*
2  * NXP Wireless LAN device driver: station TX data handling
3  *
4  * Copyright 2011-2020 NXP
5  *
6  * This software file (the "File") is distributed by NXP
7  * 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);
50 	unsigned int pad;
51 	u16 pkt_type, pkt_offset;
52 	int hroom = adapter->intf_hdr_len;
53 
54 	if (!skb->len) {
55 		mwifiex_dbg(adapter, ERROR,
56 			    "Tx: bad packet length: %d\n", skb->len);
57 		tx_info->status_code = -1;
58 		return skb->data;
59 	}
60 
61 	BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN);
62 
63 	pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
64 
65 	pad = ((void *)skb->data - (sizeof(*local_tx_pd) + hroom)-
66 			 NULL) & (MWIFIEX_DMA_ALIGN_SZ - 1);
67 	skb_push(skb, sizeof(*local_tx_pd) + pad);
68 
69 	local_tx_pd = (struct txpd *) skb->data;
70 	memset(local_tx_pd, 0, sizeof(struct txpd));
71 	local_tx_pd->bss_num = priv->bss_num;
72 	local_tx_pd->bss_type = priv->bss_type;
73 	local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len -
74 						       (sizeof(struct txpd) +
75 							pad)));
76 
77 	local_tx_pd->priority = (u8) skb->priority;
78 	local_tx_pd->pkt_delay_2ms =
79 				mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
80 
81 	if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
82 	    tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
83 		local_tx_pd->tx_token_id = tx_info->ack_frame_id;
84 		local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
85 	}
86 
87 	if (local_tx_pd->priority <
88 	    ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
89 		/*
90 		 * Set the priority specific tx_control field, setting of 0 will
91 		 *   cause the default value to be used later in this function
92 		 */
93 		local_tx_pd->tx_control =
94 			cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
95 								   priority]);
96 
97 	if (adapter->pps_uapsd_mode) {
98 		if (mwifiex_check_last_packet_indication(priv)) {
99 			adapter->tx_lock_flag = true;
100 			local_tx_pd->flags =
101 				MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
102 		}
103 	}
104 
105 	if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
106 		local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
107 
108 	/* Offset of actual data */
109 	pkt_offset = sizeof(struct txpd) + pad;
110 	if (pkt_type == PKT_TYPE_MGMT) {
111 		/* Set the packet type and add header for management frame */
112 		local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
113 		pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
114 	}
115 
116 	local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);
117 
118 	/* make space for adapter->intf_hdr_len */
119 	skb_push(skb, hroom);
120 
121 	if (!local_tx_pd->tx_control)
122 		/* TxCtrl set by user or default */
123 		local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
124 
125 	return skb->data;
126 }
127 
128 /*
129  * This function tells firmware to send a NULL data packet.
130  *
131  * The function creates a NULL data packet with TxPD and sends to the
132  * firmware for transmission, with highest priority setting.
133  */
134 int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
135 {
136 	struct mwifiex_adapter *adapter = priv->adapter;
137 	struct txpd *local_tx_pd;
138 	struct mwifiex_tx_param tx_param;
139 /* sizeof(struct txpd) + Interface specific header */
140 #define NULL_PACKET_HDR 64
141 	u32 data_len = NULL_PACKET_HDR;
142 	struct sk_buff *skb;
143 	int ret;
144 	struct mwifiex_txinfo *tx_info = NULL;
145 
146 	if (test_bit(MWIFIEX_SURPRISE_REMOVED, &adapter->work_flags))
147 		return -1;
148 
149 	if (!priv->media_connected)
150 		return -1;
151 
152 	if (adapter->data_sent)
153 		return -1;
154 
155 	if (adapter->if_ops.is_port_ready &&
156 	    !adapter->if_ops.is_port_ready(priv))
157 		return -1;
158 
159 	skb = dev_alloc_skb(data_len);
160 	if (!skb)
161 		return -1;
162 
163 	tx_info = MWIFIEX_SKB_TXCB(skb);
164 	memset(tx_info, 0, sizeof(*tx_info));
165 	tx_info->bss_num = priv->bss_num;
166 	tx_info->bss_type = priv->bss_type;
167 	tx_info->pkt_len = data_len -
168 			(sizeof(struct txpd) + adapter->intf_hdr_len);
169 	skb_reserve(skb, sizeof(struct txpd) + adapter->intf_hdr_len);
170 	skb_push(skb, sizeof(struct txpd));
171 
172 	local_tx_pd = (struct txpd *) skb->data;
173 	local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
174 	local_tx_pd->flags = flags;
175 	local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
176 	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
177 	local_tx_pd->bss_num = priv->bss_num;
178 	local_tx_pd->bss_type = priv->bss_type;
179 
180 	skb_push(skb, adapter->intf_hdr_len);
181 	if (adapter->iface_type == MWIFIEX_USB) {
182 		ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
183 						   skb, NULL);
184 	} else {
185 		tx_param.next_pkt_len = 0;
186 		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
187 						   skb, &tx_param);
188 	}
189 	switch (ret) {
190 	case -EBUSY:
191 		dev_kfree_skb_any(skb);
192 		mwifiex_dbg(adapter, ERROR,
193 			    "%s: host_to_card failed: ret=%d\n",
194 			    __func__, ret);
195 		adapter->dbg.num_tx_host_to_card_failure++;
196 		break;
197 	case -1:
198 		dev_kfree_skb_any(skb);
199 		mwifiex_dbg(adapter, ERROR,
200 			    "%s: host_to_card failed: ret=%d\n",
201 			    __func__, ret);
202 		adapter->dbg.num_tx_host_to_card_failure++;
203 		break;
204 	case 0:
205 		dev_kfree_skb_any(skb);
206 		mwifiex_dbg(adapter, DATA,
207 			    "data: %s: host_to_card succeeded\n",
208 			    __func__);
209 		adapter->tx_lock_flag = true;
210 		break;
211 	case -EINPROGRESS:
212 		adapter->tx_lock_flag = true;
213 		break;
214 	default:
215 		break;
216 	}
217 
218 	return ret;
219 }
220 
221 /*
222  * This function checks if we need to send last packet indication.
223  */
224 u8
225 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
226 {
227 	struct mwifiex_adapter *adapter = priv->adapter;
228 	u8 ret = false;
229 
230 	if (!adapter->sleep_period.period)
231 		return ret;
232 	if (mwifiex_wmm_lists_empty(adapter))
233 			ret = true;
234 
235 	if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
236 	    !is_command_pending(adapter)) {
237 		adapter->delay_null_pkt = false;
238 		ret = true;
239 	} else {
240 		ret = false;
241 		adapter->delay_null_pkt = true;
242 	}
243 	return ret;
244 }
245