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876c9d3a MT |
1 | /** |
2 | * This file contains the handling of TX in wlan driver. | |
3 | */ | |
4 | #include <linux/netdevice.h> | |
5 | ||
6 | #include "hostcmd.h" | |
7 | #include "radiotap.h" | |
8 | #include "sbi.h" | |
9 | #include "decl.h" | |
10 | #include "defs.h" | |
11 | #include "dev.h" | |
12 | #include "wext.h" | |
13 | ||
14 | /** | |
15 | * @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE | |
16 | * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1) | |
17 | * | |
18 | * @param rate Input rate | |
19 | * @return Output Rate (0 if invalid) | |
20 | */ | |
21 | static u32 convert_radiotap_rate_to_mv(u8 rate) | |
22 | { | |
23 | switch (rate) { | |
24 | case 2: /* 1 Mbps */ | |
25 | return 0 | (1 << 4); | |
26 | case 4: /* 2 Mbps */ | |
27 | return 1 | (1 << 4); | |
28 | case 11: /* 5.5 Mbps */ | |
29 | return 2 | (1 << 4); | |
30 | case 22: /* 11 Mbps */ | |
31 | return 3 | (1 << 4); | |
32 | case 12: /* 6 Mbps */ | |
33 | return 4 | (1 << 4); | |
34 | case 18: /* 9 Mbps */ | |
35 | return 5 | (1 << 4); | |
36 | case 24: /* 12 Mbps */ | |
37 | return 6 | (1 << 4); | |
38 | case 36: /* 18 Mbps */ | |
39 | return 7 | (1 << 4); | |
40 | case 48: /* 24 Mbps */ | |
41 | return 8 | (1 << 4); | |
42 | case 72: /* 36 Mbps */ | |
43 | return 9 | (1 << 4); | |
44 | case 96: /* 48 Mbps */ | |
45 | return 10 | (1 << 4); | |
46 | case 108: /* 54 Mbps */ | |
47 | return 11 | (1 << 4); | |
48 | } | |
49 | return 0; | |
50 | } | |
51 | ||
52 | /** | |
53 | * @brief This function processes a single packet and sends | |
54 | * to IF layer | |
55 | * | |
56 | * @param priv A pointer to wlan_private structure | |
57 | * @param skb A pointer to skb which includes TX packet | |
58 | * @return 0 or -1 | |
59 | */ | |
60 | static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb) | |
61 | { | |
62 | wlan_adapter *adapter = priv->adapter; | |
63 | int ret = 0; | |
64 | struct txpd localtxpd; | |
65 | struct txpd *plocaltxpd = &localtxpd; | |
66 | u8 *p802x_hdr; | |
67 | struct tx_radiotap_hdr *pradiotap_hdr; | |
68 | u32 new_rate; | |
69 | u8 *ptr = priv->adapter->tmptxbuf; | |
70 | ||
71 | ENTER(); | |
72 | ||
73 | if (priv->adapter->surpriseremoved) | |
74 | return -1; | |
75 | ||
76 | if ((priv->adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0) | |
77 | lbs_dbg_hex("TX packet: ", skb->data, | |
78 | min_t(unsigned int, skb->len, 100)); | |
79 | ||
80 | if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) { | |
81 | lbs_pr_debug(1, "Tx error: Bad skb length %d : %d\n", | |
82 | skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE); | |
83 | ret = -1; | |
84 | goto done; | |
85 | } | |
86 | ||
87 | memset(plocaltxpd, 0, sizeof(struct txpd)); | |
88 | ||
89 | plocaltxpd->tx_packet_length = skb->len; | |
90 | ||
91 | /* offset of actual data */ | |
92 | plocaltxpd->tx_packet_location = sizeof(struct txpd); | |
93 | ||
94 | /* TxCtrl set by user or default */ | |
95 | plocaltxpd->tx_control = adapter->pkttxctrl; | |
96 | ||
97 | p802x_hdr = skb->data; | |
98 | if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) { | |
99 | ||
100 | /* locate radiotap header */ | |
101 | pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data; | |
102 | ||
103 | /* set txpd fields from the radiotap header */ | |
104 | new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate); | |
105 | if (new_rate != 0) { | |
106 | /* erase tx_control[4:0] */ | |
107 | plocaltxpd->tx_control &= ~0x1f; | |
108 | /* write new tx_control[4:0] */ | |
109 | plocaltxpd->tx_control |= new_rate; | |
110 | } | |
111 | ||
112 | /* skip the radiotap header */ | |
113 | p802x_hdr += sizeof(struct tx_radiotap_hdr); | |
114 | plocaltxpd->tx_packet_length -= sizeof(struct tx_radiotap_hdr); | |
115 | ||
116 | } | |
117 | /* copy destination address from 802.3 or 802.11 header */ | |
118 | if (priv->adapter->linkmode == WLAN_LINKMODE_802_11) | |
119 | memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN); | |
120 | else | |
121 | memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN); | |
122 | ||
123 | lbs_dbg_hex("txpd", (u8 *) plocaltxpd, sizeof(struct txpd)); | |
124 | ||
125 | if (IS_MESH_FRAME(skb)) { | |
126 | plocaltxpd->tx_control |= TxPD_MESH_FRAME; | |
127 | } | |
128 | ||
129 | memcpy(ptr, plocaltxpd, sizeof(struct txpd)); | |
130 | ||
131 | ptr += sizeof(struct txpd); | |
132 | ||
133 | lbs_dbg_hex("Tx Data", (u8 *) p802x_hdr, plocaltxpd->tx_packet_length); | |
134 | memcpy(ptr, p802x_hdr, plocaltxpd->tx_packet_length); | |
135 | ret = libertas_sbi_host_to_card(priv, MVMS_DAT, | |
136 | priv->adapter->tmptxbuf, | |
137 | plocaltxpd->tx_packet_length + | |
138 | sizeof(struct txpd)); | |
139 | ||
140 | if (ret) { | |
141 | lbs_pr_debug(1, "Tx error: libertas_sbi_host_to_card failed: 0x%X\n", ret); | |
142 | goto done; | |
143 | } | |
144 | ||
145 | lbs_pr_debug(1, "SendSinglePacket succeeds\n"); | |
146 | ||
147 | done: | |
148 | if (!ret) { | |
149 | priv->stats.tx_packets++; | |
150 | priv->stats.tx_bytes += skb->len; | |
151 | } else { | |
152 | priv->stats.tx_dropped++; | |
153 | priv->stats.tx_errors++; | |
154 | } | |
155 | ||
156 | if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) { | |
157 | /* Keep the skb to echo it back once Tx feedback is | |
158 | received from FW */ | |
159 | skb_orphan(skb); | |
160 | /* stop processing outgoing pkts */ | |
161 | netif_stop_queue(priv->wlan_dev.netdev); | |
162 | /* freeze any packets already in our queues */ | |
163 | priv->adapter->TxLockFlag = 1; | |
164 | } else { | |
165 | dev_kfree_skb_any(skb); | |
166 | priv->adapter->currenttxskb = NULL; | |
167 | } | |
168 | ||
169 | LEAVE(); | |
170 | return ret; | |
171 | } | |
172 | ||
173 | ||
174 | void libertas_tx_runqueue(wlan_private *priv) | |
175 | { | |
176 | wlan_adapter *adapter = priv->adapter; | |
177 | int i; | |
178 | ||
179 | spin_lock(&adapter->txqueue_lock); | |
180 | for (i = 0; i < adapter->tx_queue_idx; i++) { | |
181 | struct sk_buff *skb = adapter->tx_queue_ps[i]; | |
182 | spin_unlock(&adapter->txqueue_lock); | |
183 | SendSinglePacket(priv, skb); | |
184 | spin_lock(&adapter->txqueue_lock); | |
185 | } | |
186 | adapter->tx_queue_idx = 0; | |
187 | spin_unlock(&adapter->txqueue_lock); | |
188 | } | |
189 | ||
190 | static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb) | |
191 | { | |
192 | wlan_adapter *adapter = priv->adapter; | |
193 | ||
194 | spin_lock(&adapter->txqueue_lock); | |
195 | ||
196 | WARN_ON(priv->adapter->tx_queue_idx >= NR_TX_QUEUE); | |
197 | adapter->tx_queue_ps[adapter->tx_queue_idx++] = skb; | |
198 | if (adapter->tx_queue_idx == NR_TX_QUEUE) | |
199 | netif_stop_queue(priv->wlan_dev.netdev); | |
200 | else | |
201 | netif_start_queue(priv->wlan_dev.netdev); | |
202 | ||
203 | spin_unlock(&adapter->txqueue_lock); | |
204 | } | |
205 | ||
206 | /** | |
207 | * @brief This function checks the conditions and sends packet to IF | |
208 | * layer if everything is ok. | |
209 | * | |
210 | * @param priv A pointer to wlan_private structure | |
211 | * @return n/a | |
212 | */ | |
213 | int libertas_process_tx(wlan_private * priv, struct sk_buff *skb) | |
214 | { | |
215 | int ret = -1; | |
216 | ||
217 | ENTER(); | |
218 | ||
219 | lbs_dbg_hex("TX Data", skb->data, min_t(unsigned int, skb->len, 100)); | |
220 | ||
221 | if (priv->wlan_dev.dnld_sent) { | |
222 | lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n", | |
223 | priv->wlan_dev.dnld_sent); | |
224 | goto done; | |
225 | } | |
226 | ||
227 | if ((priv->adapter->psstate == PS_STATE_SLEEP) || | |
228 | (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) { | |
229 | wlan_tx_queue(priv, skb); | |
230 | return ret; | |
231 | } | |
232 | ||
233 | priv->adapter->currenttxskb = skb; | |
234 | ||
235 | ret = SendSinglePacket(priv, skb); | |
236 | done: | |
237 | LEAVE(); | |
238 | return ret; | |
239 | } | |
240 | ||
241 | /** | |
242 | * @brief This function sends to the host the last transmitted packet, | |
243 | * filling the radiotap headers with transmission information. | |
244 | * | |
245 | * @param priv A pointer to wlan_private structure | |
246 | * @param status A 32 bit value containing transmission status. | |
247 | * | |
248 | * @returns void | |
249 | */ | |
250 | void libertas_send_tx_feedback(wlan_private * priv) | |
251 | { | |
252 | wlan_adapter *adapter = priv->adapter; | |
253 | struct tx_radiotap_hdr *radiotap_hdr; | |
254 | u32 status = adapter->eventcause; | |
255 | int txfail; | |
256 | int try_count; | |
257 | ||
258 | if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP || | |
259 | adapter->currenttxskb == NULL) | |
260 | return; | |
261 | ||
262 | radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data; | |
263 | ||
264 | if ((adapter->debugmode & MRVDRV_DEBUG_TX_PATH) != 0) | |
265 | lbs_dbg_hex("TX feedback: ", (u8 *) radiotap_hdr, | |
266 | min_t(unsigned int, adapter->currenttxskb->len, 100)); | |
267 | ||
268 | txfail = (status >> 24); | |
269 | ||
270 | #if 0 | |
271 | /* The version of roofnet that we've tested does not use this yet | |
272 | * But it may be used in the future. | |
273 | */ | |
274 | if (txfail) | |
275 | radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL; | |
276 | #endif | |
277 | try_count = (status >> 16) & 0xff; | |
278 | radiotap_hdr->data_retries = (try_count) ? | |
279 | (1 + adapter->txretrycount - try_count) : 0; | |
280 | libertas_upload_rx_packet(priv, adapter->currenttxskb); | |
281 | adapter->currenttxskb = NULL; | |
282 | priv->adapter->TxLockFlag = 0; | |
283 | if (priv->adapter->connect_status == libertas_connected) | |
284 | netif_wake_queue(priv->wlan_dev.netdev); | |
285 | } |