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 */
mwifiex_process_sta_txpd(struct mwifiex_private * priv,struct sk_buff * skb)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 = ((uintptr_t)skb->data - (sizeof(*local_tx_pd) + hroom)) &
66 (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 */
mwifiex_send_null_packet(struct mwifiex_private * priv,u8 flags)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
mwifiex_check_last_packet_indication(struct mwifiex_private * priv)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