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 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 52 err_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 59 static netdev_tx_t 60 ieee802154_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 struct sk_buff *nskb; 67 u16 crc; 68 69 if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) { 70 nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN, 71 GFP_ATOMIC); 72 if (likely(nskb)) { 73 consume_skb(skb); 74 skb = nskb; 75 } else { 76 goto err_tx; 77 } 78 } 79 80 crc = crc_ccitt(0, skb->data, skb->len); 81 put_unaligned_le16(crc, skb_put(skb, 2)); 82 } 83 84 /* Stop the netif queue on each sub_if_data object. */ 85 ieee802154_stop_queue(&local->hw); 86 87 /* async is priority, otherwise sync is fallback */ 88 if (local->ops->xmit_async) { 89 ret = drv_xmit_async(local, skb); 90 if (ret) { 91 ieee802154_wake_queue(&local->hw); 92 goto err_tx; 93 } 94 95 dev->stats.tx_packets++; 96 dev->stats.tx_bytes += skb->len; 97 } else { 98 local->tx_skb = skb; 99 queue_work(local->workqueue, &local->tx_work); 100 } 101 102 return NETDEV_TX_OK; 103 104 err_tx: 105 kfree_skb(skb); 106 return NETDEV_TX_OK; 107 } 108 109 netdev_tx_t 110 ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev) 111 { 112 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); 113 114 skb->skb_iif = dev->ifindex; 115 116 return ieee802154_tx(sdata->local, skb); 117 } 118 119 netdev_tx_t 120 ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev) 121 { 122 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); 123 int rc; 124 125 /* TODO we should move it to wpan_dev_hard_header and dev_hard_header 126 * functions. The reason is wireshark will show a mac header which is 127 * with security fields but the payload is not encrypted. 128 */ 129 rc = mac802154_llsec_encrypt(&sdata->sec, skb); 130 if (rc) { 131 netdev_warn(dev, "encryption failed: %i\n", rc); 132 kfree_skb(skb); 133 return NETDEV_TX_OK; 134 } 135 136 skb->skb_iif = dev->ifindex; 137 138 return ieee802154_tx(sdata->local, skb); 139 } 140