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1// SPDX-License-Identifier: GPL-2.0-only2/*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_RATE21 * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)22 *23 * @rate: Input rate24 * 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 IF59 * layer if everything is ok60 *61 * @skb: A pointer to skb which includes TX packet62 * @dev: A pointer to the &struct net_device63 * returns: 0 or -164 */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 before75 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 eth98 device simultaneously -- there's no mutual exclusion on99 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 is155 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 structure177 * @try_count: A 32-bit value containing transmission retry status.178 *179 * returns: void180 */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);207