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