1 /**
2 * This file contains the handling of TX in wlan driver.
3 */
4 #include <linux/netdevice.h>
5 #include <linux/etherdevice.h>
6 #include <linux/sched.h>
7 #include <net/cfg80211.h>
8
9 #include "host.h"
10 #include "radiotap.h"
11 #include "decl.h"
12 #include "defs.h"
13 #include "dev.h"
14
15 /**
16 * @brief This function converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
17 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
18 *
19 * @param rate Input rate
20 * @return Output Rate (0 if invalid)
21 */
convert_radiotap_rate_to_mv(u8 rate)22 static u32 convert_radiotap_rate_to_mv(u8 rate)
23 {
24 switch (rate) {
25 case 2: /* 1 Mbps */
26 return 0 | (1 << 4);
27 case 4: /* 2 Mbps */
28 return 1 | (1 << 4);
29 case 11: /* 5.5 Mbps */
30 return 2 | (1 << 4);
31 case 22: /* 11 Mbps */
32 return 3 | (1 << 4);
33 case 12: /* 6 Mbps */
34 return 4 | (1 << 4);
35 case 18: /* 9 Mbps */
36 return 5 | (1 << 4);
37 case 24: /* 12 Mbps */
38 return 6 | (1 << 4);
39 case 36: /* 18 Mbps */
40 return 7 | (1 << 4);
41 case 48: /* 24 Mbps */
42 return 8 | (1 << 4);
43 case 72: /* 36 Mbps */
44 return 9 | (1 << 4);
45 case 96: /* 48 Mbps */
46 return 10 | (1 << 4);
47 case 108: /* 54 Mbps */
48 return 11 | (1 << 4);
49 }
50 return 0;
51 }
52
53 /**
54 * @brief This function checks the conditions and sends packet to IF
55 * layer if everything is ok.
56 *
57 * @param priv A pointer to struct lbs_private structure
58 * @param skb A pointer to skb which includes TX packet
59 * @return 0 or -1
60 */
lbs_hard_start_xmit(struct sk_buff * skb,struct net_device * dev)61 netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
62 {
63 unsigned long flags;
64 struct lbs_private *priv = dev->ml_priv;
65 struct txpd *txpd;
66 char *p802x_hdr;
67 uint16_t pkt_len;
68 netdev_tx_t ret = NETDEV_TX_OK;
69
70 lbs_deb_enter(LBS_DEB_TX);
71
72 /* We need to protect against the queues being restarted before
73 we get round to stopping them */
74 spin_lock_irqsave(&priv->driver_lock, flags);
75
76 if (priv->surpriseremoved)
77 goto free;
78
79 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
80 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
81 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
82 /* We'll never manage to send this one; drop it and return 'OK' */
83
84 dev->stats.tx_dropped++;
85 dev->stats.tx_errors++;
86 goto free;
87 }
88
89
90 netif_stop_queue(priv->dev);
91 if (priv->mesh_dev)
92 netif_stop_queue(priv->mesh_dev);
93
94 if (priv->tx_pending_len) {
95 /* This can happen if packets come in on the mesh and eth
96 device simultaneously -- there's no mutual exclusion on
97 hard_start_xmit() calls between devices. */
98 lbs_deb_tx("Packet on %s while busy\n", dev->name);
99 ret = NETDEV_TX_BUSY;
100 goto unlock;
101 }
102
103 priv->tx_pending_len = -1;
104 spin_unlock_irqrestore(&priv->driver_lock, flags);
105
106 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
107
108 txpd = (void *)priv->tx_pending_buf;
109 memset(txpd, 0, sizeof(struct txpd));
110
111 p802x_hdr = skb->data;
112 pkt_len = skb->len;
113
114 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
115 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
116
117 /* set txpd fields from the radiotap header */
118 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
119
120 /* skip the radiotap header */
121 p802x_hdr += sizeof(*rtap_hdr);
122 pkt_len -= sizeof(*rtap_hdr);
123
124 /* copy destination address from 802.11 header */
125 memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
126 } else {
127 /* copy destination address from 802.3 header */
128 memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
129 }
130
131 txpd->tx_packet_length = cpu_to_le16(pkt_len);
132 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
133
134 lbs_mesh_set_txpd(priv, dev, txpd);
135
136 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
137
138 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
139
140 memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
141
142 spin_lock_irqsave(&priv->driver_lock, flags);
143 priv->tx_pending_len = pkt_len + sizeof(struct txpd);
144
145 lbs_deb_tx("%s lined up packet\n", __func__);
146
147 dev->stats.tx_packets++;
148 dev->stats.tx_bytes += skb->len;
149
150 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
151 /* Keep the skb to echo it back once Tx feedback is
152 received from FW */
153 skb_orphan(skb);
154
155 /* Keep the skb around for when we get feedback */
156 priv->currenttxskb = skb;
157 } else {
158 free:
159 dev_kfree_skb_any(skb);
160 }
161
162 unlock:
163 spin_unlock_irqrestore(&priv->driver_lock, flags);
164 wake_up(&priv->waitq);
165
166 lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
167 return ret;
168 }
169
170 /**
171 * @brief This function sends to the host the last transmitted packet,
172 * filling the radiotap headers with transmission information.
173 *
174 * @param priv A pointer to struct lbs_private structure
175 * @param status A 32 bit value containing transmission status.
176 *
177 * @returns void
178 */
lbs_send_tx_feedback(struct lbs_private * priv,u32 try_count)179 void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
180 {
181 struct tx_radiotap_hdr *radiotap_hdr;
182
183 if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
184 priv->currenttxskb == NULL)
185 return;
186
187 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
188
189 radiotap_hdr->data_retries = try_count ?
190 (1 + priv->txretrycount - try_count) : 0;
191
192 priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
193 priv->dev);
194 netif_rx(priv->currenttxskb);
195
196 priv->currenttxskb = NULL;
197
198 if (priv->connect_status == LBS_CONNECTED)
199 netif_wake_queue(priv->dev);
200
201 if (priv->mesh_dev && lbs_mesh_connected(priv))
202 netif_wake_queue(priv->mesh_dev);
203 }
204 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);
205