LXR linux/net/mac802154/tx.c

   1/*
   2 * Copyright 2007-2012 Siemens AG
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2
   6 * as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * Written by:
  14 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
  15 * Sergey Lapin <slapin@ossfans.org>
  16 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
  17 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  18 */
  19
  20#include <linux/netdevice.h>
  21#include <linux/if_arp.h>
  22#include <linux/crc-ccitt.h>
  23#include <asm/unaligned.h>
  24
  25#include <net/rtnetlink.h>
  26#include <net/ieee802154_netdev.h>
  27#include <net/mac802154.h>
  28#include <net/cfg802154.h>
  29
  30#include "ieee802154_i.h"
  31#include "driver-ops.h"
  32
  33void ieee802154_xmit_worker(struct work_struct *work)
  34{
  35        struct ieee802154_local *local =
  36                container_of(work, struct ieee802154_local, tx_work);
  37        struct sk_buff *skb = local->tx_skb;
  38        struct net_device *dev = skb->dev;
  39        int res;
  40
  41        res = drv_xmit_sync(local, skb);
  42        if (res)
  43                goto err_tx;
  44
  45        ieee802154_xmit_complete(&local->hw, skb, false);
  46
  47        dev->stats.tx_packets++;
  48        dev->stats.tx_bytes += skb->len;
  49
  50        return;
  51
  52err_tx:
  53        /* Restart the netif queue on each sub_if_data object. */
  54        ieee802154_wake_queue(&local->hw);
  55        kfree_skb(skb);
  56        netdev_dbg(dev, "transmission failed\n");
  57}
  58
  59static netdev_tx_t
  60ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
  61{
  62        struct net_device *dev = skb->dev;
  63        int ret;
  64
  65        if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
  66                u16 crc = crc_ccitt(0, skb->data, skb->len);
  67
  68                put_unaligned_le16(crc, skb_put(skb, 2));
  69        }
  70
  71        /* Stop the netif queue on each sub_if_data object. */
  72        ieee802154_stop_queue(&local->hw);
  73
  74        /* async is priority, otherwise sync is fallback */
  75        if (local->ops->xmit_async) {
  76                ret = drv_xmit_async(local, skb);
  77                if (ret) {
  78                        ieee802154_wake_queue(&local->hw);
  79                        goto err_tx;
  80                }
  81
  82                dev->stats.tx_packets++;
  83                dev->stats.tx_bytes += skb->len;
  84        } else {
  85                local->tx_skb = skb;
  86                queue_work(local->workqueue, &local->tx_work);
  87        }
  88
  89        return NETDEV_TX_OK;
  90
  91err_tx:
  92        kfree_skb(skb);
  93        return NETDEV_TX_OK;
  94}
  95
  96netdev_tx_t
  97ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
  98{
  99        struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 100
 101        skb->skb_iif = dev->ifindex;
 102
 103        return ieee802154_tx(sdata->local, skb);
 104}
 105
 106netdev_tx_t
 107ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
 108{
 109        struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 110        int rc;
 111
 112        /* TODO we should move it to wpan_dev_hard_header and dev_hard_header
 113         * functions. The reason is wireshark will show a mac header which is
 114         * with security fields but the payload is not encrypted.
 115         */
 116        rc = mac802154_llsec_encrypt(&sdata->sec, skb);
 117        if (rc) {
 118                netdev_warn(dev, "encryption failed: %i\n", rc);
 119                kfree_skb(skb);
 120                return NETDEV_TX_OK;
 121        }
 122
 123        skb->skb_iif = dev->ifindex;
 124
 125        return ieee802154_tx(sdata->local, skb);
 126}
 127