1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * NXP Wireless LAN device driver: station TX data handling
4  *
5  * Copyright 2011-2020 NXP
6  */
7 
8 #include "decl.h"
9 #include "ioctl.h"
10 #include "util.h"
11 #include "fw.h"
12 #include "main.h"
13 #include "wmm.h"
14 
15 /*
16  * This function fills the TxPD for tx packets.
17  *
18  * The Tx buffer received by this function should already have the
19  * header space allocated for TxPD.
20  *
21  * This function inserts the TxPD in between interface header and actual
22  * data and adjusts the buffer pointers accordingly.
23  *
24  * The following TxPD fields are set by this function, as required -
25  *      - BSS number
26  *      - Tx packet length and offset
27  *      - Priority
28  *      - Packet delay
29  *      - Priority specific Tx control
30  *      - Flags
31  */
mwifiex_process_sta_txpd(struct mwifiex_private * priv,struct sk_buff * skb)32 void *mwifiex_process_sta_txpd(struct mwifiex_private *priv,
33 				struct sk_buff *skb)
34 {
35 	struct mwifiex_adapter *adapter = priv->adapter;
36 	struct txpd *local_tx_pd;
37 	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
38 	unsigned int pad;
39 	u16 pkt_type, pkt_offset;
40 	int hroom = adapter->intf_hdr_len;
41 
42 	if (!skb->len) {
43 		mwifiex_dbg(adapter, ERROR,
44 			    "Tx: bad packet length: %d\n", skb->len);
45 		tx_info->status_code = -1;
46 		return skb->data;
47 	}
48 
49 	BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN);
50 
51 	pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
52 
53 	pad = ((uintptr_t)skb->data - (sizeof(*local_tx_pd) + hroom)) &
54 	       (MWIFIEX_DMA_ALIGN_SZ - 1);
55 	skb_push(skb, sizeof(*local_tx_pd) + pad);
56 
57 	local_tx_pd = (struct txpd *) skb->data;
58 	memset(local_tx_pd, 0, sizeof(struct txpd));
59 	local_tx_pd->bss_num = priv->bss_num;
60 	local_tx_pd->bss_type = priv->bss_type;
61 	local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len -
62 						       (sizeof(struct txpd) +
63 							pad)));
64 
65 	local_tx_pd->priority = (u8) skb->priority;
66 	local_tx_pd->pkt_delay_2ms =
67 				mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
68 
69 	if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
70 	    tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
71 		local_tx_pd->tx_token_id = tx_info->ack_frame_id;
72 		local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
73 	}
74 
75 	if (local_tx_pd->priority <
76 	    ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
77 		/*
78 		 * Set the priority specific tx_control field, setting of 0 will
79 		 *   cause the default value to be used later in this function
80 		 */
81 		local_tx_pd->tx_control =
82 			cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
83 								   priority]);
84 
85 	if (adapter->pps_uapsd_mode) {
86 		if (mwifiex_check_last_packet_indication(priv)) {
87 			adapter->tx_lock_flag = true;
88 			local_tx_pd->flags =
89 				MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
90 		}
91 	}
92 
93 	if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
94 		local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
95 
96 	/* Offset of actual data */
97 	pkt_offset = sizeof(struct txpd) + pad;
98 	if (pkt_type == PKT_TYPE_MGMT) {
99 		/* Set the packet type and add header for management frame */
100 		local_tx_pd->tx_pkt_type = cpu_to_le16(pkt_type);
101 		pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
102 	}
103 
104 	local_tx_pd->tx_pkt_offset = cpu_to_le16(pkt_offset);
105 
106 	/* make space for adapter->intf_hdr_len */
107 	skb_push(skb, hroom);
108 
109 	if (!local_tx_pd->tx_control)
110 		/* TxCtrl set by user or default */
111 		local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
112 
113 	return skb->data;
114 }
115 
116 /*
117  * This function tells firmware to send a NULL data packet.
118  *
119  * The function creates a NULL data packet with TxPD and sends to the
120  * firmware for transmission, with highest priority setting.
121  */
mwifiex_send_null_packet(struct mwifiex_private * priv,u8 flags)122 int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
123 {
124 	struct mwifiex_adapter *adapter = priv->adapter;
125 	struct txpd *local_tx_pd;
126 	struct mwifiex_tx_param tx_param;
127 /* sizeof(struct txpd) + Interface specific header */
128 #define NULL_PACKET_HDR 64
129 	u32 data_len = NULL_PACKET_HDR;
130 	struct sk_buff *skb;
131 	int ret;
132 	struct mwifiex_txinfo *tx_info = NULL;
133 
134 	if (test_bit(MWIFIEX_SURPRISE_REMOVED, &adapter->work_flags))
135 		return -1;
136 
137 	if (!priv->media_connected)
138 		return -1;
139 
140 	if (adapter->data_sent)
141 		return -1;
142 
143 	if (adapter->if_ops.is_port_ready &&
144 	    !adapter->if_ops.is_port_ready(priv))
145 		return -1;
146 
147 	skb = dev_alloc_skb(data_len);
148 	if (!skb)
149 		return -1;
150 
151 	tx_info = MWIFIEX_SKB_TXCB(skb);
152 	memset(tx_info, 0, sizeof(*tx_info));
153 	tx_info->bss_num = priv->bss_num;
154 	tx_info->bss_type = priv->bss_type;
155 	tx_info->pkt_len = data_len -
156 			(sizeof(struct txpd) + adapter->intf_hdr_len);
157 	skb_reserve(skb, sizeof(struct txpd) + adapter->intf_hdr_len);
158 	skb_push(skb, sizeof(struct txpd));
159 
160 	local_tx_pd = (struct txpd *) skb->data;
161 	local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
162 	local_tx_pd->flags = flags;
163 	local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
164 	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
165 	local_tx_pd->bss_num = priv->bss_num;
166 	local_tx_pd->bss_type = priv->bss_type;
167 
168 	skb_push(skb, adapter->intf_hdr_len);
169 	if (adapter->iface_type == MWIFIEX_USB) {
170 		ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
171 						   skb, NULL);
172 	} else {
173 		tx_param.next_pkt_len = 0;
174 		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
175 						   skb, &tx_param);
176 	}
177 	switch (ret) {
178 	case -EBUSY:
179 		dev_kfree_skb_any(skb);
180 		mwifiex_dbg(adapter, ERROR,
181 			    "%s: host_to_card failed: ret=%d\n",
182 			    __func__, ret);
183 		adapter->dbg.num_tx_host_to_card_failure++;
184 		break;
185 	case -1:
186 		dev_kfree_skb_any(skb);
187 		mwifiex_dbg(adapter, ERROR,
188 			    "%s: host_to_card failed: ret=%d\n",
189 			    __func__, ret);
190 		adapter->dbg.num_tx_host_to_card_failure++;
191 		break;
192 	case 0:
193 		dev_kfree_skb_any(skb);
194 		mwifiex_dbg(adapter, DATA,
195 			    "data: %s: host_to_card succeeded\n",
196 			    __func__);
197 		adapter->tx_lock_flag = true;
198 		break;
199 	case -EINPROGRESS:
200 		adapter->tx_lock_flag = true;
201 		break;
202 	default:
203 		break;
204 	}
205 
206 	return ret;
207 }
208 
209 /*
210  * This function checks if we need to send last packet indication.
211  */
212 u8
mwifiex_check_last_packet_indication(struct mwifiex_private * priv)213 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
214 {
215 	struct mwifiex_adapter *adapter = priv->adapter;
216 	u8 ret = false;
217 
218 	if (!adapter->sleep_period.period)
219 		return ret;
220 	if (mwifiex_wmm_lists_empty(adapter))
221 			ret = true;
222 
223 	if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
224 	    !is_command_pending(adapter)) {
225 		adapter->delay_null_pkt = false;
226 		ret = true;
227 	} else {
228 		ret = false;
229 		adapter->delay_null_pkt = true;
230 	}
231 	return ret;
232 }
233