2 * This file contains the handling of TX in wlan driver.
4 #include <linux/netdevice.h>
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)
18 * @param rate Input rate
19 * @return Output Rate (0 if invalid)
21 static u32 convert_radiotap_rate_to_mv(u8 rate)
28 case 11: /* 5.5 Mbps */
30 case 22: /* 11 Mbps */
36 case 24: /* 12 Mbps */
38 case 36: /* 18 Mbps */
40 case 48: /* 24 Mbps */
42 case 72: /* 36 Mbps */
44 case 96: /* 48 Mbps */
46 case 108: /* 54 Mbps */
53 * @brief This function processes a single packet and sends
56 * @param priv A pointer to wlan_private structure
57 * @param skb A pointer to skb which includes TX packet
60 static int SendSinglePacket(wlan_private * priv, struct sk_buff *skb)
62 wlan_adapter *adapter = priv->adapter;
64 struct txpd localtxpd;
65 struct txpd *plocaltxpd = &localtxpd;
67 struct tx_radiotap_hdr *pradiotap_hdr;
69 u8 *ptr = priv->adapter->tmptxbuf;
73 if (priv->adapter->surpriseremoved)
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));
80 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
81 lbs_pr_debug(1, "Tx error: Bad skb length %d : %zd\n",
82 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
87 memset(plocaltxpd, 0, sizeof(struct txpd));
89 plocaltxpd->tx_packet_length = skb->len;
91 /* offset of actual data */
92 plocaltxpd->tx_packet_location = sizeof(struct txpd);
94 /* TxCtrl set by user or default */
95 plocaltxpd->tx_control = adapter->pkttxctrl;
97 p802x_hdr = skb->data;
98 if (priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
100 /* locate radiotap header */
101 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data;
103 /* set txpd fields from the radiotap header */
104 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate);
106 /* erase tx_control[4:0] */
107 plocaltxpd->tx_control &= ~0x1f;
108 /* write new tx_control[4:0] */
109 plocaltxpd->tx_control |= new_rate;
112 /* skip the radiotap header */
113 p802x_hdr += sizeof(struct tx_radiotap_hdr);
114 plocaltxpd->tx_packet_length -= sizeof(struct tx_radiotap_hdr);
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);
121 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
123 lbs_dbg_hex("txpd", (u8 *) plocaltxpd, sizeof(struct txpd));
125 if (IS_MESH_FRAME(skb)) {
126 plocaltxpd->tx_control |= TxPD_MESH_FRAME;
129 memcpy(ptr, plocaltxpd, sizeof(struct txpd));
131 ptr += sizeof(struct txpd);
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));
141 lbs_pr_debug(1, "Tx error: libertas_sbi_host_to_card failed: 0x%X\n", ret);
145 lbs_pr_debug(1, "SendSinglePacket succeeds\n");
149 priv->stats.tx_packets++;
150 priv->stats.tx_bytes += skb->len;
152 priv->stats.tx_dropped++;
153 priv->stats.tx_errors++;
156 if (!ret && priv->adapter->radiomode == WLAN_RADIOMODE_RADIOTAP) {
157 /* Keep the skb to echo it back once Tx feedback is
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;
165 dev_kfree_skb_any(skb);
166 priv->adapter->currenttxskb = NULL;
174 void libertas_tx_runqueue(wlan_private *priv)
176 wlan_adapter *adapter = priv->adapter;
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);
186 adapter->tx_queue_idx = 0;
187 spin_unlock(&adapter->txqueue_lock);
190 static void wlan_tx_queue(wlan_private *priv, struct sk_buff *skb)
192 wlan_adapter *adapter = priv->adapter;
194 spin_lock(&adapter->txqueue_lock);
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);
201 netif_start_queue(priv->wlan_dev.netdev);
203 spin_unlock(&adapter->txqueue_lock);
207 * @brief This function checks the conditions and sends packet to IF
208 * layer if everything is ok.
210 * @param priv A pointer to wlan_private structure
213 int libertas_process_tx(wlan_private * priv, struct sk_buff *skb)
219 lbs_dbg_hex("TX Data", skb->data, min_t(unsigned int, skb->len, 100));
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);
227 if ((priv->adapter->psstate == PS_STATE_SLEEP) ||
228 (priv->adapter->psstate == PS_STATE_PRE_SLEEP)) {
229 wlan_tx_queue(priv, skb);
233 priv->adapter->currenttxskb = skb;
235 ret = SendSinglePacket(priv, skb);
242 * @brief This function sends to the host the last transmitted packet,
243 * filling the radiotap headers with transmission information.
245 * @param priv A pointer to wlan_private structure
246 * @param status A 32 bit value containing transmission status.
250 void libertas_send_tx_feedback(wlan_private * priv)
252 wlan_adapter *adapter = priv->adapter;
253 struct tx_radiotap_hdr *radiotap_hdr;
254 u32 status = adapter->eventcause;
258 if (adapter->radiomode != WLAN_RADIOMODE_RADIOTAP ||
259 adapter->currenttxskb == NULL)
262 radiotap_hdr = (struct tx_radiotap_hdr *)adapter->currenttxskb->data;
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));
268 txfail = (status >> 24);
271 /* The version of roofnet that we've tested does not use this yet
272 * But it may be used in the future.
275 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
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);