208 lines
5.4 KiB
C
208 lines
5.4 KiB
C
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/*
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* This file contains the handling of TX in wlan driver.
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*/
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#include <linux/hardirq.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/sched.h>
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#include <linux/export.h>
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#include <net/cfg80211.h>
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#include "host.h"
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#include "radiotap.h"
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#include "decl.h"
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#include "defs.h"
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#include "dev.h"
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#include "mesh.h"
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/**
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* convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
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* units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
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*
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* @rate: Input rate
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* returns: Output Rate (0 if invalid)
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*/
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static u32 convert_radiotap_rate_to_mv(u8 rate)
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{
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switch (rate) {
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case 2: /* 1 Mbps */
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return 0 | (1 << 4);
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case 4: /* 2 Mbps */
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return 1 | (1 << 4);
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case 11: /* 5.5 Mbps */
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return 2 | (1 << 4);
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case 22: /* 11 Mbps */
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return 3 | (1 << 4);
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case 12: /* 6 Mbps */
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return 4 | (1 << 4);
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case 18: /* 9 Mbps */
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return 5 | (1 << 4);
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case 24: /* 12 Mbps */
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return 6 | (1 << 4);
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case 36: /* 18 Mbps */
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return 7 | (1 << 4);
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case 48: /* 24 Mbps */
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return 8 | (1 << 4);
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case 72: /* 36 Mbps */
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return 9 | (1 << 4);
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case 96: /* 48 Mbps */
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return 10 | (1 << 4);
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case 108: /* 54 Mbps */
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return 11 | (1 << 4);
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}
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return 0;
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}
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/**
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* lbs_hard_start_xmit - checks the conditions and sends packet to IF
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* layer if everything is ok
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*
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* @skb: A pointer to skb which includes TX packet
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* @dev: A pointer to the &struct net_device
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* returns: 0 or -1
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*/
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netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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unsigned long flags;
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struct lbs_private *priv = dev->ml_priv;
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struct txpd *txpd;
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char *p802x_hdr;
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uint16_t pkt_len;
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netdev_tx_t ret = NETDEV_TX_OK;
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lbs_deb_enter(LBS_DEB_TX);
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/* We need to protect against the queues being restarted before
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we get round to stopping them */
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spin_lock_irqsave(&priv->driver_lock, flags);
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if (priv->surpriseremoved)
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goto free;
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if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
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lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
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skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
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/* We'll never manage to send this one; drop it and return 'OK' */
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dev->stats.tx_dropped++;
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dev->stats.tx_errors++;
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goto free;
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}
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netif_stop_queue(priv->dev);
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if (priv->mesh_dev)
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netif_stop_queue(priv->mesh_dev);
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if (priv->tx_pending_len) {
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/* This can happen if packets come in on the mesh and eth
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device simultaneously -- there's no mutual exclusion on
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hard_start_xmit() calls between devices. */
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lbs_deb_tx("Packet on %s while busy\n", dev->name);
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ret = NETDEV_TX_BUSY;
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goto unlock;
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}
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priv->tx_pending_len = -1;
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spin_unlock_irqrestore(&priv->driver_lock, flags);
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lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
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txpd = (void *)priv->tx_pending_buf;
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memset(txpd, 0, sizeof(struct txpd));
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p802x_hdr = skb->data;
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pkt_len = skb->len;
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if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
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struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
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/* set txpd fields from the radiotap header */
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txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
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/* skip the radiotap header */
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p802x_hdr += sizeof(*rtap_hdr);
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pkt_len -= sizeof(*rtap_hdr);
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/* copy destination address from 802.11 header */
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memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
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} else {
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/* copy destination address from 802.3 header */
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memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
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}
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txpd->tx_packet_length = cpu_to_le16(pkt_len);
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txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
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lbs_mesh_set_txpd(priv, dev, txpd);
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lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
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lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
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memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
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spin_lock_irqsave(&priv->driver_lock, flags);
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priv->tx_pending_len = pkt_len + sizeof(struct txpd);
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lbs_deb_tx("%s lined up packet\n", __func__);
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
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/* Keep the skb to echo it back once Tx feedback is
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received from FW */
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skb_orphan(skb);
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/* Keep the skb around for when we get feedback */
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priv->currenttxskb = skb;
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} else {
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free:
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dev_kfree_skb_any(skb);
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}
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unlock:
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spin_unlock_irqrestore(&priv->driver_lock, flags);
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wake_up(&priv->waitq);
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lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
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return ret;
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}
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/**
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* lbs_send_tx_feedback - sends to the host the last transmitted packet,
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* filling the radiotap headers with transmission information.
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*
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* @priv: A pointer to &struct lbs_private structure
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* @try_count: A 32-bit value containing transmission retry status.
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*
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* returns: void
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*/
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void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
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{
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struct tx_radiotap_hdr *radiotap_hdr;
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if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
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priv->currenttxskb == NULL)
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return;
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radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
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radiotap_hdr->data_retries = try_count ?
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(1 + priv->txretrycount - try_count) : 0;
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priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
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priv->dev);
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netif_rx(priv->currenttxskb);
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priv->currenttxskb = NULL;
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if (priv->connect_status == LBS_CONNECTED)
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netif_wake_queue(priv->dev);
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if (priv->mesh_dev && netif_running(priv->mesh_dev))
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netif_wake_queue(priv->mesh_dev);
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}
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EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);
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