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 33 void 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 rtnl_lock(); 42 43 /* check if ifdown occurred while schedule */ 44 if (!netif_running(dev)) 45 goto err_tx; 46 47 res = drv_xmit_sync(local, skb); 48 if (res) 49 goto err_tx; 50 51 ieee802154_xmit_complete(&local->hw, skb, false); 52 53 dev->stats.tx_packets++; 54 dev->stats.tx_bytes += skb->len; 55 56 rtnl_unlock(); 57 58 return; 59 60 err_tx: 61 /* Restart the netif queue on each sub_if_data object. */ 62 ieee802154_wake_queue(&local->hw); 63 rtnl_unlock(); 64 kfree_skb(skb); 65 netdev_dbg(dev, "transmission failed\n"); 66 } 67 68 static netdev_tx_t 69 ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb) 70 { 71 struct net_device *dev = skb->dev; 72 int ret; 73 74 if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) { 75 u16 crc = crc_ccitt(0, skb->data, skb->len); 76 77 put_unaligned_le16(crc, skb_put(skb, 2)); 78 } 79 80 /* Stop the netif queue on each sub_if_data object. */ 81 ieee802154_stop_queue(&local->hw); 82 83 /* async is priority, otherwise sync is fallback */ 84 if (local->ops->xmit_async) { 85 ret = drv_xmit_async(local, skb); 86 if (ret) { 87 ieee802154_wake_queue(&local->hw); 88 goto err_tx; 89 } 90 91 dev->stats.tx_packets++; 92 dev->stats.tx_bytes += skb->len; 93 } else { 94 local->tx_skb = skb; 95 queue_work(local->workqueue, &local->tx_work); 96 } 97 98 return NETDEV_TX_OK; 99 100 err_tx: 101 kfree_skb(skb); 102 return NETDEV_TX_OK; 103 } 104 105 netdev_tx_t 106 ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev) 107 { 108 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); 109 110 skb->skb_iif = dev->ifindex; 111 112 return ieee802154_tx(sdata->local, skb); 113 } 114 115 netdev_tx_t 116 ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev) 117 { 118 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); 119 int rc; 120 121 /* TODO we should move it to wpan_dev_hard_header and dev_hard_header 122 * functions. The reason is wireshark will show a mac header which is 123 * with security fields but the payload is not encrypted. 124 */ 125 rc = mac802154_llsec_encrypt(&sdata->sec, skb); 126 if (rc) { 127 netdev_warn(dev, "encryption failed: %i\n", rc); 128 kfree_skb(skb); 129 return NETDEV_TX_OK; 130 } 131 132 skb->skb_iif = dev->ifindex; 133 134 return ieee802154_tx(sdata->local, skb); 135 } 136