net/mac802154/tx.c

   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
  25 void 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         ieee802154_xmit_complete(&local->hw, skb, false);
  38
  39         dev->stats.tx_packets++;
  40         dev->stats.tx_bytes += skb->len;
  41
  42         return;
  43
  44 err_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
  51 static netdev_tx_t
  52 ieee802154_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                 ret = drv_xmit_async(local, skb);
  82                 if (ret) {
  83                         ieee802154_wake_queue(&local->hw);
  84                         goto err_tx;
  85                 }
  86
  87                 dev->stats.tx_packets++;
  88                 dev->stats.tx_bytes += skb->len;
  89         } else {
  90                 local->tx_skb = skb;
  91                 queue_work(local->workqueue, &local->tx_work);
  92         }
  93
  94         return NETDEV_TX_OK;
  95
  96 err_tx:
  97         kfree_skb(skb);
  98         return NETDEV_TX_OK;
  99 }
 100
 101 netdev_tx_t
 102 ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
 103 {
 104         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 105
 106         skb->skb_iif = dev->ifindex;
 107
 108         return ieee802154_tx(sdata->local, skb);
 109 }
 110
 111 netdev_tx_t
 112 ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
 113 {
 114         struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
 115         int rc;
 116
 117         /* TODO we should move it to wpan_dev_hard_header and dev_hard_header
 118          * functions. The reason is wireshark will show a mac header which is
 119          * with security fields but the payload is not encrypted.
 120          */
 121         rc = mac802154_llsec_encrypt(&sdata->sec, skb);
 122         if (rc) {
 123                 netdev_warn(dev, "encryption failed: %i\n", rc);
 124                 kfree_skb(skb);
 125                 return NETDEV_TX_OK;
 126         }
 127
 128         skb->skb_iif = dev->ifindex;
 129
 130         return ieee802154_tx(sdata->local, skb);
 131 }