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path: root/drivers/net/wireless/marvell/libertas/tx.c
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Diffstat (limited to 'drivers/net/wireless/marvell/libertas/tx.c')
-rw-r--r--drivers/net/wireless/marvell/libertas/tx.c207
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/net/wireless/marvell/libertas/tx.c b/drivers/net/wireless/marvell/libertas/tx.c
new file mode 100644
index 000000000000..c025f9c18282
--- /dev/null
+++ b/drivers/net/wireless/marvell/libertas/tx.c
@@ -0,0 +1,207 @@
+/*
+ * This file contains the handling of TX in wlan driver.
+ */
+#include <linux/hardirq.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/sched.h>
+#include <linux/export.h>
+#include <net/cfg80211.h>
+
+#include "host.h"
+#include "radiotap.h"
+#include "decl.h"
+#include "defs.h"
+#include "dev.h"
+#include "mesh.h"
+
+/**
+ * convert_radiotap_rate_to_mv - converts Tx/Rx rates from IEEE80211_RADIOTAP_RATE
+ * units (500 Kb/s) into Marvell WLAN format (see Table 8 in Section 3.2.1)
+ *
+ * @rate: Input rate
+ * returns: Output Rate (0 if invalid)
+ */
+static u32 convert_radiotap_rate_to_mv(u8 rate)
+{
+ switch (rate) {
+ case 2: /* 1 Mbps */
+ return 0 | (1 << 4);
+ case 4: /* 2 Mbps */
+ return 1 | (1 << 4);
+ case 11: /* 5.5 Mbps */
+ return 2 | (1 << 4);
+ case 22: /* 11 Mbps */
+ return 3 | (1 << 4);
+ case 12: /* 6 Mbps */
+ return 4 | (1 << 4);
+ case 18: /* 9 Mbps */
+ return 5 | (1 << 4);
+ case 24: /* 12 Mbps */
+ return 6 | (1 << 4);
+ case 36: /* 18 Mbps */
+ return 7 | (1 << 4);
+ case 48: /* 24 Mbps */
+ return 8 | (1 << 4);
+ case 72: /* 36 Mbps */
+ return 9 | (1 << 4);
+ case 96: /* 48 Mbps */
+ return 10 | (1 << 4);
+ case 108: /* 54 Mbps */
+ return 11 | (1 << 4);
+ }
+ return 0;
+}
+
+/**
+ * lbs_hard_start_xmit - checks the conditions and sends packet to IF
+ * layer if everything is ok
+ *
+ * @skb: A pointer to skb which includes TX packet
+ * @dev: A pointer to the &struct net_device
+ * returns: 0 or -1
+ */
+netdev_tx_t lbs_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ unsigned long flags;
+ struct lbs_private *priv = dev->ml_priv;
+ struct txpd *txpd;
+ char *p802x_hdr;
+ uint16_t pkt_len;
+ netdev_tx_t ret = NETDEV_TX_OK;
+
+ lbs_deb_enter(LBS_DEB_TX);
+
+ /* We need to protect against the queues being restarted before
+ we get round to stopping them */
+ spin_lock_irqsave(&priv->driver_lock, flags);
+
+ if (priv->surpriseremoved)
+ goto free;
+
+ if (!skb->len || (skb->len > MRVDRV_ETH_TX_PACKET_BUFFER_SIZE)) {
+ lbs_deb_tx("tx err: skb length %d 0 or > %zd\n",
+ skb->len, MRVDRV_ETH_TX_PACKET_BUFFER_SIZE);
+ /* We'll never manage to send this one; drop it and return 'OK' */
+
+ dev->stats.tx_dropped++;
+ dev->stats.tx_errors++;
+ goto free;
+ }
+
+
+ netif_stop_queue(priv->dev);
+ if (priv->mesh_dev)
+ netif_stop_queue(priv->mesh_dev);
+
+ if (priv->tx_pending_len) {
+ /* This can happen if packets come in on the mesh and eth
+ device simultaneously -- there's no mutual exclusion on
+ hard_start_xmit() calls between devices. */
+ lbs_deb_tx("Packet on %s while busy\n", dev->name);
+ ret = NETDEV_TX_BUSY;
+ goto unlock;
+ }
+
+ priv->tx_pending_len = -1;
+ spin_unlock_irqrestore(&priv->driver_lock, flags);
+
+ lbs_deb_hex(LBS_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
+
+ txpd = (void *)priv->tx_pending_buf;
+ memset(txpd, 0, sizeof(struct txpd));
+
+ p802x_hdr = skb->data;
+ pkt_len = skb->len;
+
+ if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
+ struct tx_radiotap_hdr *rtap_hdr = (void *)skb->data;
+
+ /* set txpd fields from the radiotap header */
+ txpd->tx_control = cpu_to_le32(convert_radiotap_rate_to_mv(rtap_hdr->rate));
+
+ /* skip the radiotap header */
+ p802x_hdr += sizeof(*rtap_hdr);
+ pkt_len -= sizeof(*rtap_hdr);
+
+ /* copy destination address from 802.11 header */
+ memcpy(txpd->tx_dest_addr_high, p802x_hdr + 4, ETH_ALEN);
+ } else {
+ /* copy destination address from 802.3 header */
+ memcpy(txpd->tx_dest_addr_high, p802x_hdr, ETH_ALEN);
+ }
+
+ txpd->tx_packet_length = cpu_to_le16(pkt_len);
+ txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
+
+ lbs_mesh_set_txpd(priv, dev, txpd);
+
+ lbs_deb_hex(LBS_DEB_TX, "txpd", (u8 *) &txpd, sizeof(struct txpd));
+
+ lbs_deb_hex(LBS_DEB_TX, "Tx Data", (u8 *) p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
+
+ memcpy(&txpd[1], p802x_hdr, le16_to_cpu(txpd->tx_packet_length));
+
+ spin_lock_irqsave(&priv->driver_lock, flags);
+ priv->tx_pending_len = pkt_len + sizeof(struct txpd);
+
+ lbs_deb_tx("%s lined up packet\n", __func__);
+
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+
+ if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
+ /* Keep the skb to echo it back once Tx feedback is
+ received from FW */
+ skb_orphan(skb);
+
+ /* Keep the skb around for when we get feedback */
+ priv->currenttxskb = skb;
+ } else {
+ free:
+ dev_kfree_skb_any(skb);
+ }
+
+ unlock:
+ spin_unlock_irqrestore(&priv->driver_lock, flags);
+ wake_up(&priv->waitq);
+
+ lbs_deb_leave_args(LBS_DEB_TX, "ret %d", ret);
+ return ret;
+}
+
+/**
+ * lbs_send_tx_feedback - sends to the host the last transmitted packet,
+ * filling the radiotap headers with transmission information.
+ *
+ * @priv: A pointer to &struct lbs_private structure
+ * @try_count: A 32-bit value containing transmission retry status.
+ *
+ * returns: void
+ */
+void lbs_send_tx_feedback(struct lbs_private *priv, u32 try_count)
+{
+ struct tx_radiotap_hdr *radiotap_hdr;
+
+ if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
+ priv->currenttxskb == NULL)
+ return;
+
+ radiotap_hdr = (struct tx_radiotap_hdr *)priv->currenttxskb->data;
+
+ radiotap_hdr->data_retries = try_count ?
+ (1 + priv->txretrycount - try_count) : 0;
+
+ priv->currenttxskb->protocol = eth_type_trans(priv->currenttxskb,
+ priv->dev);
+ netif_rx(priv->currenttxskb);
+
+ priv->currenttxskb = NULL;
+
+ if (priv->connect_status == LBS_CONNECTED)
+ netif_wake_queue(priv->dev);
+
+ if (priv->mesh_dev && netif_running(priv->mesh_dev))
+ netif_wake_queue(priv->mesh_dev);
+}
+EXPORT_SYMBOL_GPL(lbs_send_tx_feedback);