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 int lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
62 struct lbs_private *priv = dev->priv;
68 lbs_deb_enter(LBS_DEB_TX);
72 if (priv->dnld_sent) {
73 lbs_pr_alert( "TX error: dnld_sent = %d, not sending\n",
78 if (priv->currenttxskb) {
79 lbs_pr_err("%s while TX skb pending\n", __func__);
83 if ((priv->psstate == PS_STATE_SLEEP) ||
84 (priv->psstate == PS_STATE_PRE_SLEEP)) {
85 lbs_pr_alert("TX error: packet xmit in %ssleep mode\n",
86 priv->psstate == PS_STATE_SLEEP?"":"pre-");
90 if (priv->surpriseremoved)
93 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
94 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
95 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
96 /* We'll never manage to send this one; drop it and return 'OK' */
100 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
102 txpd = (void *)priv->tmptxbuf;
103 memset(txpd, 0, sizeof(struct txpd));
105 p802x_hdr = skb->data;
108 if (dev == priv->rtap_net_dev) {
109 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
111 /* set txpd fields from the radiotap header */
112 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
114 /* skip the radiotap header */
115 p802x_hdr += sizeof(*rtap_hdr);
116 pkt_len -= sizeof(*rtap_hdr);
118 /* copy destination address from 802.11 header */
119 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
121 /* copy destination address from 802.3 header */
122 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
125 txpd->tx_packet_length = cpu_to_le16(pkt_len);
126 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
128 if (dev == priv->mesh_dev)
129 txpd->tx_control |= cpu_to_le32(TxPD_MESH_FRAME);
131 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
133 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
135 memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
137 /* We need to protect against the queues being restarted before
138 we get round to stopping them */
139 spin_lock_irqsave(&priv->driver_lock, flags);
141 ret = priv->hw_host_to_card(priv, MVMS_DAT, priv->tmptxbuf,
142 pkt_len + sizeof(struct txpd));
145 lbs_deb_tx("%s succeeds\n", __func__);
147 /* Stop processing outgoing pkts before submitting */
148 netif_stop_queue(priv->dev);
150 netif_stop_queue(priv->mesh_dev);
152 priv->stats.tx_packets++;
153 priv->stats.tx_bytes += skb->len;
155 dev->trans_start = jiffies;
157 if (priv->monitormode != LBS_MONITOR_OFF) {
158 /* Keep the skb to echo it back once Tx feedback is
162 /* Keep the skb around for when we get feedback */
163 priv->currenttxskb = skb;
167 spin_unlock_irqrestore(&priv->driver_lock, flags);
170 lbs_deb_tx("tx err: hw_host_to_card returned 0x%X\n", ret);
172 priv->stats.tx_dropped++;
173 priv->stats.tx_errors++;
175 dev_kfree_skb_any(skb);
178 /* Even if we dropped the packet, return OK. Otherwise the
179 packet gets requeued. */
183 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
188 * @brief This function sends to the host the last transmitted packet,
189 * filling the radiotap headers with transmission information.
191 * @param priv A pointer to struct lbs_private structure
192 * @param status A 32 bit value containing transmission status.
196 void lbs_send_tx_feedback(struct lbs_private *priv)
198 struct tx_radiotap_hdr *radiotap_hdr;
199 u32 status = priv->eventcause;
203 if (priv->monitormode == LBS_MONITOR_OFF ||
204 priv->currenttxskb == NULL)
207 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
209 txfail = (status >> 24);
212 /* The version of roofnet that we've tested does not use this yet
213 * But it may be used in the future.
216 radiotap_hdr->flags &= IEEE80211_RADIOTAP_F_TX_FAIL;
218 try_count = (status >> 16) & 0xff;
219 radiotap_hdr->data_retries = (try_count) ?
220 (1 + priv->txretrycount - try_count) : 0;
221 lbs_upload_rx_packet(priv, priv->currenttxskb);
222 priv->currenttxskb = NULL;
224 if (priv->connect_status == LBS_CONNECTED)
225 netif_wake_queue(priv->dev);
227 if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED))
228 netif_wake_queue(priv->mesh_dev);
230 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);