tx.c

  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);