2 * This file contains the handling of TX in wlan driver.
4 #include <linux/netdevice.h>
14 * @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
15 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
17 * @param rate Input rate
18 * @return Output Rate (0 if invalid)
20 static u32 convert_radiotap_rate_to_mv(u8 rate)
27 case 11: /* 5.5 Mbps */
29 case 22: /* 11 Mbps */
35 case 24: /* 12 Mbps */
37 case 36: /* 18 Mbps */
39 case 48: /* 24 Mbps */
41 case 72: /* 36 Mbps */
43 case 96: /* 48 Mbps */
45 case 108: /* 54 Mbps */
52 * @brief This function checks the conditions and sends packet to IF
53 * layer if everything is ok.
55 * @param priv A pointer to struct lbs_private structure
56 * @param skb A pointer to skb which includes TX packet
59 static int lbs_process_tx(struct lbs_private *priv, struct sk_buff *skb)
62 struct txpd localtxpd;
63 struct txpd *plocaltxpd = &localtxpd;
65 struct tx_radiotap_hdr *pradiotap_hdr;
67 u8 *ptr = priv->tmptxbuf;
69 lbs_deb_enter(LBS_DEB_TX);
71 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
73 if (priv->dnld_sent) {
74 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
79 if ((priv->psstate == PS_STATE_SLEEP) ||
80 (priv->psstate == PS_STATE_PRE_SLEEP)) {
81 lbs_pr_alert("TX error: packet xmit in %ssleep mode\n",
82 priv->psstate == PS_STATE_SLEEP?"":"pre-");
86 if (priv->surpriseremoved)
89 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
90 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
91 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
96 memset(plocaltxpd, 0, sizeof(struct txpd));
98 plocaltxpd->tx_packet_length = cpu_to_le16(skb->len);
100 /* offset of actual data */
101 plocaltxpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
103 p802x_hdr = skb->data;
104 if (priv->monitormode != LBS_MONITOR_OFF) {
106 /* locate radiotap header */
107 pradiotap_hdr = (struct tx_radiotap_hdr *)skb->data;
109 /* set txpd fields from the radiotap header */
110 new_rate = convert_radiotap_rate_to_mv(pradiotap_hdr->rate);
112 /* use new tx_control[4:0] */
113 plocaltxpd->tx_control = cpu_to_le32(new_rate);
116 /* skip the radiotap header */
117 p802x_hdr += sizeof(struct tx_radiotap_hdr);
118 plocaltxpd->tx_packet_length =
119 cpu_to_le16(le16_to_cpu(plocaltxpd->tx_packet_length)
120 - sizeof(struct tx_radiotap_hdr));
123 /* copy destination address from 802.3 or 802.11 header */
124 if (priv->monitormode != LBS_MONITOR_OFF)
125 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
127 memcpy(plocaltxpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
129 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) plocaltxpd, sizeof(struct txpd));
131 if (IS_MESH_FRAME(skb)) {
132 plocaltxpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME);
135 memcpy(ptr, plocaltxpd, sizeof(struct txpd));
137 ptr += sizeof(struct txpd);
139 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length));
140 memcpy(ptr, p802x_hdr, le16_to_cpu(plocaltxpd->tx_packet_length));
141 ret = priv->hw_host_to_card(priv, MVMS_DAT,
143 le16_to_cpu(plocaltxpd->tx_packet_length) +
144 sizeof(struct txpd));
147 lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret);
151 lbs_deb_tx("%s succeeds\n", __func__);
155 priv->stats.tx_packets++;
156 priv->stats.tx_bytes += skb->len;
158 priv->stats.tx_dropped++;
159 priv->stats.tx_errors++;
162 if (!ret && priv->monitormode != LBS_MONITOR_OFF) {
163 /* Keep the skb to echo it back once Tx feedback is
166 /* stop processing outgoing pkts */
167 netif_stop_queue(priv->dev);
169 netif_stop_queue(priv->mesh_dev);
171 /* Keep the skb around for when we get feedback */
172 priv->currenttxskb = skb;
174 dev_kfree_skb_any(skb);
178 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
182 int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
185 struct lbs_private *priv = dev->priv;
187 lbs_deb_enter(LBS_DEB_TX);
189 /* We could return NETDEV_TX_BUSY here, but I'd actually
190 like to get the point where we can BUG() */
191 if (priv->dnld_sent) {
192 lbs_pr_err("%s while dnld_sent\n", __func__);
193 priv->stats.tx_dropped++;
196 if (priv->currenttxskb) {
197 lbs_pr_err("%s while TX skb pending\n", __func__);
198 priv->stats.tx_dropped++;
202 netif_stop_queue(priv->dev);
204 netif_stop_queue(priv->mesh_dev);
206 if (lbs_process_tx(priv, skb) == 0)
207 dev->trans_start = jiffies;
209 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
214 * @brief This function sends to the host the last transmitted packet,
215 * filling the radiotap headers with transmission information.
217 * @param priv A pointer to struct lbs_private structure
218 * @param status A 32 bit value containing transmission status.
222 void lbs_send_tx_feedback(struct lbs_private *priv)
224 struct tx_radiotap_hdr *radiotap_hdr;
225 u32 status = priv->eventcause;
229 if (priv->monitormode == LBS_MONITOR_OFF ||
230 priv->currenttxskb == NULL)
233 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
235 txfail = (status >> 24);
238 /* The version of roofnet that we've tested does not use this yet
239 * But it may be used in the future.
242 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
244 try_count = (status >> 16) & 0xff;
245 radiotap_hdr->data_retries = (try_count) ?
246 (1 + priv->txretrycount - try_count) : 0;
247 lbs_upload_rx_packet(priv, priv->currenttxskb);
248 priv->currenttxskb = NULL;
250 if (priv->connect_status == LBS_CONNECTED)
251 netif_wake_queue(priv->dev);
253 if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED))
254 netif_wake_queue(priv->mesh_dev);
256 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);