linux/net/mac802154/tx.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright 2007-2012 Siemens AG
   4 *
   5 * Written by:
   6 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
   7 * Sergey Lapin <slapin@ossfans.org>
   8 * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
   9 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  10 */
  11
  12#include <linux/netdevice.h>
  13#include <linux/if_arp.h>
  14#include <linux/crc-ccitt.h>
  15#include <asm/unaligned.h>
  16
  17#include <net/rtnetlink.h>
  18#include <net/ieee802154_netdev.h>
  19#include <net/mac802154.h>
  20#include <net/cfg802154.h>
  21
  22#include "ieee802154_i.h"
  23#include "driver-ops.h"
  24
  25void ieee802154_xmit_worker(struct work_struct *work)
  26{
  27        struct ieee802154_local *local =
  28                container_of(work, struct ieee802154_local, tx_work);
  29        struct sk_buff *skb = local->tx_skb;
  30        struct net_device *dev = skb->dev;
  31        int res;
  32
  33        res = drv_xmit_sync(local, skb);
  34        if (res)
  35                goto err_tx;
  36
  37        dev->stats.tx_packets++;
  38        dev->stats.tx_bytes += skb->len;
  39
  40        ieee802154_xmit_complete(&local->hw, skb, false);
  41
  42        return;
  43
  44err_tx:
  45        /* Restart the netif queue on each sub_if_data object. */
  46        ieee802154_wake_queue(&local->hw);
  47        kfree_skb(skb);
  48        netdev_dbg(dev, "transmission failed\n");
  49}
  50
  51static netdev_tx_t
  52ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
  53{
  54        struct net_device *dev = skb->dev;
  55        int ret;
  56
  57        if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
  58                struct sk_buff *nskb;
  59                u16 crc;
  60
  61                if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
  62                        nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
  63                                               GFP_ATOMIC);
  64                        if (likely(nskb)) {
  65                                consume_skb(skb);
  66                                skb = nskb;
  67                        } else {
  68                                goto err_tx;
  69                        }
  70                }
  71
  72                crc = crc_ccitt(0, skb->data, skb->len);
  73                put_unaligned_le16(crc, skb_put(skb, 2));
  74        }
  75
  76        /* Stop the netif queue on each sub_if_data object. */
  77        ieee802154_stop_queue(&local->hw);
  78
  79        /* async is priority, otherwise sync is fallback */
  80        if (local->ops->xmit_async) {
  81                unsigned int len = skb->len;
  82
  83                ret = drv_xmit_async(local, skb);
  84                if (ret) {
  85                        ieee802154_wake_queue(&local->hw);
  86                        goto err_tx;
  87                }
  88
  89                dev->stats.tx_packets++;
  90                dev->stats.tx_bytes += len;
  91        } else {
  92                local->tx_skb = skb;
  93                queue_work(local->workqueue, &local->tx_work);
  94        }
  95
  96        return NETDEV_TX_OK;
  97
  98err_tx:
  99        kfree_skb(skb);
 100        return NETDEV_TX_OK;
 101}
 102
 103netdev_tx_t
 104ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
 105{
 106        struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 107
 108        skb->skb_iif = dev->ifindex;
 109
 110        return ieee802154_tx(sdata->local, skb);
 111}
 112
 113netdev_tx_t
 114ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
 115{
 116        struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 117        int rc;
 118
 119        /* TODO we should move it to wpan_dev_hard_header and dev_hard_header
 120         * functions. The reason is wireshark will show a mac header which is
 121         * with security fields but the payload is not encrypted.
 122         */
 123        rc = mac802154_llsec_encrypt(&sdata->sec, skb);
 124        if (rc) {
 125                netdev_warn(dev, "encryption failed: %i\n", rc);
 126                kfree_skb(skb);
 127                return NETDEV_TX_OK;
 128        }
 129
 130        skb->skb_iif = dev->ifindex;
 131
 132        return ieee802154_tx(sdata->local, skb);
 133}
 134