1 /*
2 * Marvell Wireless LAN device driver: station TX data handling
3 *
4 * Copyright (C) 2011-2014, 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 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 = (priv->adapter->iface_type == MWIFIEX_USB) ? 0 :
53 INTF_HEADER_LEN;
54
55 if (!skb->len) {
56 dev_err(adapter->dev, "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 INTF_HEADER_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 (adapter->surprise_removed)
147 return -1;
148
149 if (!priv->media_connected)
150 return -1;
151
152 if (adapter->data_sent)
153 return -1;
154
155 skb = dev_alloc_skb(data_len);
156 if (!skb)
157 return -1;
158
159 tx_info = MWIFIEX_SKB_TXCB(skb);
160 memset(tx_info, 0, sizeof(*tx_info));
161 tx_info->bss_num = priv->bss_num;
162 tx_info->bss_type = priv->bss_type;
163 tx_info->pkt_len = data_len - (sizeof(struct txpd) + INTF_HEADER_LEN);
164 skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
165 skb_push(skb, sizeof(struct txpd));
166
167 local_tx_pd = (struct txpd *) skb->data;
168 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
169 local_tx_pd->flags = flags;
170 local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
171 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
172 local_tx_pd->bss_num = priv->bss_num;
173 local_tx_pd->bss_type = priv->bss_type;
174
175 if (adapter->iface_type == MWIFIEX_USB) {
176 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
177 skb, NULL);
178 } else {
179 skb_push(skb, INTF_HEADER_LEN);
180 tx_param.next_pkt_len = 0;
181 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
182 skb, &tx_param);
183 }
184 switch (ret) {
185 case -EBUSY:
186 dev_kfree_skb_any(skb);
187 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
188 __func__, ret);
189 adapter->dbg.num_tx_host_to_card_failure++;
190 break;
191 case -1:
192 adapter->data_sent = false;
193 dev_kfree_skb_any(skb);
194 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
195 __func__, ret);
196 adapter->dbg.num_tx_host_to_card_failure++;
197 break;
198 case 0:
199 dev_kfree_skb_any(skb);
200 dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
201 __func__);
202 adapter->tx_lock_flag = true;
203 break;
204 case -EINPROGRESS:
205 adapter->tx_lock_flag = true;
206 break;
207 default:
208 break;
209 }
210
211 return ret;
212 }
213
214 /*
215 * This function checks if we need to send last packet indication.
216 */
217 u8
mwifiex_check_last_packet_indication(struct mwifiex_private * priv)218 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
219 {
220 struct mwifiex_adapter *adapter = priv->adapter;
221 u8 ret = false;
222
223 if (!adapter->sleep_period.period)
224 return ret;
225 if (mwifiex_wmm_lists_empty(adapter))
226 ret = true;
227
228 if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
229 !is_command_pending(adapter)) {
230 adapter->delay_null_pkt = false;
231 ret = true;
232 } else {
233 ret = false;
234 adapter->delay_null_pkt = true;
235 }
236 return ret;
237 }
238