1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This file contains the handling of TX in wlan driver.
4 */
5 #include <linux/hardirq.h>
6 #include <linux/netdevice.h>
7 #include <linux/etherdevice.h>
8 #include <linux/sched.h>
9 #include <linux/export.h>
10 #include <net/cfg80211.h>
11
12 #include "host.h"
13 #include "radiotap.h"
14 #include "decl.h"
15 #include "defs.h"
16 #include "dev.h"
17 #include "mesh.h"
18
19 /**
20 * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
21 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
22 *
23 * @rate: Input rate
24 * returns: Output Rate (0 if invalid)
25 */
convert_radiotap_rate_to_mv(u8 rate)26 static u32 convert_radiotap_rate_to_mv(u8 rate)
27 {
28 switch (rate) {
29 case 2: /* 1 Mbps */
30 return 0 | (1 << 4);
31 case 4: /* 2 Mbps */
32 return 1 | (1 << 4);
33 case 11: /* 5.5 Mbps */
34 return 2 | (1 << 4);
35 case 22: /* 11 Mbps */
36 return 3 | (1 << 4);
37 case 12: /* 6 Mbps */
38 return 4 | (1 << 4);
39 case 18: /* 9 Mbps */
40 return 5 | (1 << 4);
41 case 24: /* 12 Mbps */
42 return 6 | (1 << 4);
43 case 36: /* 18 Mbps */
44 return 7 | (1 << 4);
45 case 48: /* 24 Mbps */
46 return 8 | (1 << 4);
47 case 72: /* 36 Mbps */
48 return 9 | (1 << 4);
49 case 96: /* 48 Mbps */
50 return 10 | (1 << 4);
51 case 108: /* 54 Mbps */
52 return 11 | (1 << 4);
53 }
54 return 0;
55 }
56
57 /**
58 * lbs_hard_start_xmit - checks the conditions and sends packet to IF
59 * layer if everything is ok
60 *
61 * @skb: A pointer to skb which includes TX packet
62 * @dev: A pointer to the &struct net_device
63 * returns: 0 or -1
64 */
lbs_hard_start_xmit(struct sk_buff * skb,struct net_device * dev)65 netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
66 {
67 unsigned long flags;
68 struct lbs_private *priv = dev->ml_priv;
69 struct txpd *txpd;
70 char *p802x_hdr;
71 uint16_t pkt_len;
72 netdev_tx_t ret = NETDEV_TX_OK;
73
74 /* We need to protect against the queues being restarted before
75 we get round to stopping them */
76 spin_lock_irqsave(&priv->driver_lock, flags);
77
78 if (priv->surpriseremoved)
79 goto free;
80
81 if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
82 lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
83 skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
84 /* We'll never manage to send this one; drop it and return 'OK' */
85
86 dev->stats.tx_dropped++;
87 dev->stats.tx_errors++;
88 goto free;
89 }
90
91
92 netif_stop_queue(priv->dev);
93 if (priv->mesh_dev)
94 netif_stop_queue(priv->mesh_dev);
95
96 if (priv->tx_pending_len) {
97 /* This can happen if packets come in on the mesh and eth
98 device simultaneously -- there's no mutual exclusion on
99 hard_start_xmit() calls between devices. */
100 lbs_deb_tx("Packet on %s while busy\n", dev->name);
101 ret = NETDEV_TX_BUSY;
102 goto unlock;
103 }
104
105 priv->tx_pending_len = -1;
106 spin_unlock_irqrestore(&priv->driver_lock, flags);
107
108 lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
109
110 txpd = (void *)priv->tx_pending_buf;
111 memset(txpd, 0, sizeof(struct txpd));
112
113 p802x_hdr = skb->data;
114 pkt_len = skb->len;
115
116 BUILD_BUG_ON(sizeof(txpd->tx_dest_addr) != ETH_ALEN);
117 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
118 struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
119
120 if (skb->len < sizeof(*rtap_hdr) + 4 + ETH_ALEN) {
121 lbs_deb_tx("tx err: short monitor frame %u\n", skb->len);
122 dev->stats.tx_dropped++;
123 dev->stats.tx_errors++;
124 goto free;
125 }
126
127 /* set txpd fields from the radiotap header */
128 txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
129
130 /* skip the radiotap header */
131 p802x_hdr += sizeof(*rtap_hdr);
132 pkt_len -= sizeof(*rtap_hdr);
133
134 /* copy destination address from 802.11 header */
135 memcpy(&txpd->tx_dest_addr, p802x_hdr + 4, ETH_ALEN);
136 } else {
137 /* copy destination address from 802.3 header */
138 memcpy(&txpd->tx_dest_addr, p802x_hdr, ETH_ALEN);
139 }
140
141 txpd->tx_packet_length = cpu_to_le16(pkt_len);
142 txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
143
144 lbs_mesh_set_txpd(priv, dev, txpd);
145
146 lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
147
148 lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
149
150 memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
151
152 spin_lock_irqsave(&priv->driver_lock, flags);
153 priv->tx_pending_len = pkt_len + sizeof(struct txpd);
154
155 lbs_deb_tx("%s lined up packet\n", __func__);
156
157 dev->stats.tx_packets++;
158 dev->stats.tx_bytes += skb->len;
159
160 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
161 /* Keep the skb to echo it back once Tx feedback is
162 received from FW */
163 skb_orphan(skb);
164
165 /* Keep the skb around for when we get feedback */
166 priv->currenttxskb = skb;
167 } else {
168 free:
169 dev_kfree_skb_any(skb);
170 }
171
172 unlock:
173 spin_unlock_irqrestore(&priv->driver_lock, flags);
174 wake_up(&priv->waitq);
175
176 return ret;
177 }
178
179 /**
180 * lbs_send_tx_feedback - sends to the host the last transmitted packet,
181 * filling the radiotap headers with transmission information.
182 *
183 * @priv: A pointer to &struct lbs_private structure
184 * @try_count: A 32-bit value containing transmission retry status.
185 *
186 * returns: void
187 */
lbs_send_tx_feedback(struct lbs_private * priv,u32 try_count)188 void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
189 {
190 struct tx_radiotap_hdr *radiotap_hdr;
191
192 if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
193 priv->currenttxskb == NULL)
194 return;
195
196 radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
197
198 radiotap_hdr->data_retries = try_count ?
199 (1 + priv->txretrycount - try_count) : 0;
200
201 priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
202 priv->dev);
203 netif_rx(priv->currenttxskb);
204
205 priv->currenttxskb = NULL;
206
207 if (priv->connect_status == LBS_CONNECTED)
208 netif_wake_queue(priv->dev);
209
210 if (priv->mesh_dev && netif_running(priv->mesh_dev))
211 netif_wake_queue(priv->mesh_dev);
212 }
213 EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);
214