aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/libertas/tx.c
blob: 82d06223043e50c1024a7295a99b3c79bb61d85e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
/**
  * This file contains the handling of TX in wlan driver.
  */
#include <linux/netdevice.h>

#include "hostcmd.h"
#include "radiotap.h"
#include "sbi.h"
#include "decl.h"
#include "defs.h"
#include "dev.h"
#include "wext.h"

/**
 *  @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
 *  units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
 *
 *  @param rate    Input rate
 *  @return      Output Rate (0 if invalid)
 */
static u32 convert_radiotap_rate_to_mv(u8 rate)
{
	switch (rate) {
	case 2:		/*   1 Mbps */
		return 0 | (1 << 4);
	case 4:		/*   2 Mbps */
		return 1 | (1 << 4);
	case 11:		/* 5.5 Mbps */
		return 2 | (1 << 4);
	case 22:		/*  11 Mbps */
		return 3 | (1 << 4);
	case 12:		/*   6 Mbps */
		return 4 | (1 << 4);
	case 18:		/*   9 Mbps */
		return 5 | (1 << 4);
	case 24:		/*  12 Mbps */
		return 6 | (1 << 4);
	case 36:		/*  18 Mbps */
		return 7 | (1 << 4);
	case 48:		/*  24 Mbps */
		return 8 | (1 << 4);
	case 72:		/*  36 Mbps */
		return 9 | (1 << 4);
	case 96:		/*  48 Mbps */
		return 10 | (1 << 4);
	case 108:		/*  54 Mbps */
		return 11 | (1 << 4);
	}
	return 0;
}

/**
 *  @brief This function processes a single packet and sends
 *  to IF layer
 *
 *  @param priv    A pointer to wlan_private structure
 *  @param skb     A pointer to skb which includes TX packet
 *  @return 	   0 or -1
 */
static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb)
{
	wlan_adapter *adapter = priv->adapter;
	int ret = 0;
	struct txpd localtxpd;
	struct txpd *plocaltxpd = &localtxpd;
	u8 *p802x_hdr;
	struct tx_radiotap_hdr *pradiotap_hdr;
	u32 new_rate;
	u8 *ptr = priv->adapter->tmptxbuf;

	ENTER();

	if (priv->adapter->surpriseremoved)
		return -1;

	if ((priv->adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0)
		lbs_dbg_hex("TX packet: ", skb->data,
			 min_t(unsigned int, skb->len, 100));

	if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
		lbs_pr_debug(1, "Tx error: Bad skb length %d : %d\n",
		       skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
		ret = -1;
		goto done;
	}

	memset(plocaltxpd, 0, sizeof(struct txpd));

	plocaltxpd->tx_packet_length = skb->len;

	/* offset of actual data */
	plocaltxpd->tx_packet_location = sizeof(struct txpd);

	/* TxCtrl set by user or default */
	plocaltxpd->tx_control = adapter->pkttxctrl;

	p802x_hdr = skb->data;
	if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {

		/* locate radiotap header */
		pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data;

		/* set txpd fields from the radiotap header */
		new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate);
		if (new_rate != 0) {
			/* erase tx_control[4:0] */
			plocaltxpd->tx_control &= ~0x1f;
			/* write new tx_control[4:0] */
			plocaltxpd->tx_control |= new_rate;
		}

		/* skip the radiotap header */
		p802x_hdr += sizeof(struct tx_radiotap_hdr);
		plocaltxpd->tx_packet_length -= sizeof(struct tx_radiotap_hdr);

	}
	/* copy destination address from 802.3 or 802.11 header */
	if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
		memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
	else
		memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);

	lbs_dbg_hex("txpd", (u8 *) plocaltxpd, sizeof(struct txpd));

	if (IS_MESH_FRAME(skb)) {
		plocaltxpd->tx_control |= TxPD_MESH_FRAME;
	}

	memcpy(ptr, plocaltxpd, sizeof(struct txpd));

	ptr += sizeof(struct txpd);

	lbs_dbg_hex("Tx Data", (u8 *) p802x_hdr, plocaltxpd->tx_packet_length);
	memcpy(ptr, p802x_hdr, plocaltxpd->tx_packet_length);
	ret = libertas_sbi_host_to_card(priv, MVMS_DAT,
			       priv->adapter->tmptxbuf,
			       plocaltxpd->tx_packet_length +
			       sizeof(struct txpd));

	if (ret) {
		lbs_pr_debug(1, "Tx error: libertas_sbi_host_to_card failed: 0x%X\n", ret);
		goto done;
	}

	lbs_pr_debug(1, "SendSinglePacket succeeds\n");

      done:
	if (!ret) {
		priv->stats.tx_packets++;
		priv->stats.tx_bytes += skb->len;
	} else {
		priv->stats.tx_dropped++;
		priv->stats.tx_errors++;
	}

	if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
		/* Keep the skb to echo it back once Tx feedback is
		   received from FW */
		skb_orphan(skb);
		/* stop processing outgoing pkts */
		netif_stop_queue(priv->wlan_dev.netdev);
		/* freeze any packets already in our queues */
		priv->adapter->TxLockFlag = 1;
	} else {
		dev_kfree_skb_any(skb);
		priv->adapter->currenttxskb = NULL;
	}

	LEAVE();
	return ret;
}


void libertas_tx_runqueue(wlan_private *priv)
{
	wlan_adapter *adapter = priv->adapter;
	int i;

	spin_lock(&adapter->txqueue_lock);
	for (i = 0; i < adapter->tx_queue_idx; i++) {
		struct sk_buff *skb = adapter->tx_queue_ps[i];
		spin_unlock(&adapter->txqueue_lock);
		SendSinglePacket(priv, skb);
		spin_lock(&adapter->txqueue_lock);
	}
	adapter->tx_queue_idx = 0;
	spin_unlock(&adapter->txqueue_lock);
}

static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb)
{
	wlan_adapter *adapter = priv->adapter;

	spin_lock(&adapter->txqueue_lock);

	WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE);
	adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb;
	if (adapter->tx_queue_idx == NR_TX_QUEUE)
		netif_stop_queue(priv->wlan_dev.netdev);
	else
		netif_start_queue(priv->wlan_dev.netdev);

	spin_unlock(&adapter->txqueue_lock);
}

/**
 *  @brief This function checks the conditions and sends packet to IF
 *  layer if everything is ok.
 *
 *  @param priv    A pointer to wlan_private structure
 *  @return 	   n/a
 */
int libertas_process_tx(wlan_private * priv, struct sk_buff *skb)
{
	int ret = -1;

	ENTER();

	lbs_dbg_hex("TX Data", skb->data, min_t(unsigned int, skb->len, 100));

	if (priv->wlan_dev.dnld_sent) {
		lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
		       priv->wlan_dev.dnld_sent);
		goto done;
	}

	if ((priv->adapter->psstate == PS_STATE_SLEEP) ||
	    (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) {
		wlan_tx_queue(priv, skb);
		return ret;
	}

	priv->adapter->currenttxskb = skb;

	ret = SendSinglePacket(priv, skb);
done:
	LEAVE();
	return ret;
}

/**
 *  @brief This function sends to the host the last transmitted packet,
 *  filling the radiotap headers with transmission information.
 *
 *  @param priv     A pointer to wlan_private structure
 *  @param status   A 32 bit value containing transmission status.
 *
 *  @returns void
 */
void libertas_send_tx_feedback(wlan_private * priv)
{
	wlan_adapter *adapter = priv->adapter;
	struct tx_radiotap_hdr *radiotap_hdr;
	u32 status = adapter->eventcause;
	int txfail;
	int try_count;

	if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP ||
	    adapter->currenttxskb == NULL)
		return;

	radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data;

	if ((adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0)
		lbs_dbg_hex("TX feedback: ", (u8 *) radiotap_hdr,
			min_t(unsigned int, adapter->currenttxskb->len, 100));

	txfail = (status >> 24);

#if 0
	/* The version of roofnet that we've tested does not use this yet
	 * But it may be used in the future.
	 */
	if (txfail)
		radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
#endif
	try_count = (status >> 16) & 0xff;
	radiotap_hdr->data_retries = (try_count) ?
	    (1 + adapter->txretrycount - try_count) : 0;
	libertas_upload_rx_packet(priv, adapter->currenttxskb);
	adapter->currenttxskb = NULL;
	priv->adapter->TxLockFlag = 0;
	if (priv->adapter->connect_status == libertas_connected)
		netif_wake_queue(priv->wlan_dev.netdev);
}