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 } 132