1 /*
2 * Marvell Wireless LAN device driver: station TX data handling
3 *
4 * Copyright (C) 2011, 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 u8 pad;
51
52 if (!skb->len) {
53 dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
54 tx_info->status_code = -1;
55 return skb->data;
56 }
57
58 /* If skb->data is not aligned; add padding */
59 pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
60
61 BUG_ON(skb_headroom(skb) < (sizeof(*local_tx_pd) + INTF_HEADER_LEN
62 + pad));
63 skb_push(skb, sizeof(*local_tx_pd) + pad);
64
65 local_tx_pd = (struct txpd *) skb->data;
66 memset(local_tx_pd, 0, sizeof(struct txpd));
67 local_tx_pd->bss_num = priv->bss_num;
68 local_tx_pd->bss_type = priv->bss_type;
69 local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len -
70 (sizeof(struct txpd)
71 + pad)));
72
73 local_tx_pd->priority = (u8) skb->priority;
74 local_tx_pd->pkt_delay_2ms =
75 mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
76
77 if (local_tx_pd->priority <
78 ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
79 /*
80 * Set the priority specific tx_control field, setting of 0 will
81 * cause the default value to be used later in this function
82 */
83 local_tx_pd->tx_control =
84 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
85 priority]);
86
87 if (adapter->pps_uapsd_mode) {
88 if (mwifiex_check_last_packet_indication(priv)) {
89 adapter->tx_lock_flag = true;
90 local_tx_pd->flags =
91 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
92 }
93 }
94
95 /* Offset of actual data */
96 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) + pad);
97
98 /* make space for INTF_HEADER_LEN */
99 skb_push(skb, INTF_HEADER_LEN);
100
101 if (!local_tx_pd->tx_control)
102 /* TxCtrl set by user or default */
103 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
104
105 return skb->data;
106 }
107
108 /*
109 * This function tells firmware to send a NULL data packet.
110 *
111 * The function creates a NULL data packet with TxPD and sends to the
112 * firmware for transmission, with highest priority setting.
113 */
mwifiex_send_null_packet(struct mwifiex_private * priv,u8 flags)114 int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
115 {
116 struct mwifiex_adapter *adapter = priv->adapter;
117 struct txpd *local_tx_pd;
118 /* sizeof(struct txpd) + Interface specific header */
119 #define NULL_PACKET_HDR 64
120 u32 data_len = NULL_PACKET_HDR;
121 struct sk_buff *skb;
122 int ret;
123 struct mwifiex_txinfo *tx_info = NULL;
124
125 if (adapter->surprise_removed)
126 return -1;
127
128 if (!priv->media_connected)
129 return -1;
130
131 if (adapter->data_sent)
132 return -1;
133
134 skb = dev_alloc_skb(data_len);
135 if (!skb)
136 return -1;
137
138 tx_info = MWIFIEX_SKB_TXCB(skb);
139 tx_info->bss_num = priv->bss_num;
140 tx_info->bss_type = priv->bss_type;
141 skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
142 skb_push(skb, sizeof(struct txpd));
143
144 local_tx_pd = (struct txpd *) skb->data;
145 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
146 local_tx_pd->flags = flags;
147 local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
148 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
149 local_tx_pd->bss_num = priv->bss_num;
150 local_tx_pd->bss_type = priv->bss_type;
151
152 skb_push(skb, INTF_HEADER_LEN);
153
154 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
155 skb, NULL);
156 switch (ret) {
157 case -EBUSY:
158 adapter->data_sent = true;
159 /* Fall through FAILURE handling */
160 case -1:
161 dev_kfree_skb_any(skb);
162 dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
163 __func__, ret);
164 adapter->dbg.num_tx_host_to_card_failure++;
165 break;
166 case 0:
167 dev_kfree_skb_any(skb);
168 dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
169 __func__);
170 adapter->tx_lock_flag = true;
171 break;
172 case -EINPROGRESS:
173 break;
174 default:
175 break;
176 }
177
178 return ret;
179 }
180
181 /*
182 * This function checks if we need to send last packet indication.
183 */
184 u8
mwifiex_check_last_packet_indication(struct mwifiex_private * priv)185 mwifiex_check_last_packet_indication(struct mwifiex_private *priv)
186 {
187 struct mwifiex_adapter *adapter = priv->adapter;
188 u8 ret = false;
189
190 if (!adapter->sleep_period.period)
191 return ret;
192 if (mwifiex_wmm_lists_empty(adapter))
193 ret = true;
194
195 if (ret && !adapter->cmd_sent && !adapter->curr_cmd &&
196 !is_command_pending(adapter)) {
197 adapter->delay_null_pkt = false;
198 ret = true;
199 } else {
200 ret = false;
201 adapter->delay_null_pkt = true;
202 }
203 return ret;
204 }
205