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205 lines
5.4 KiB
205 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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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/* 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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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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