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