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alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +00001/*
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 *
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000013 * 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>
Alexander Aring061ef8f2014-10-27 17:13:28 +010023#include <asm/unaligned.h>
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000024
Alexander Aring6001d522014-10-26 09:37:09 +010025#include <net/rtnetlink.h>
Alan Ottb5992fe2013-04-03 04:00:56 +000026#include <net/ieee802154_netdev.h>
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000027#include <net/mac802154.h>
Alexander Aring5ad60d32014-10-25 09:41:02 +020028#include <net/cfg802154.h>
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000029
Alexander Aring0f1556b2014-10-25 09:41:00 +020030#include "ieee802154_i.h"
Alexander Aring59cb3002014-10-28 18:21:21 +010031#include "driver-ops.h"
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000032
Lennert Buytenhekc22ff7b2015-07-21 17:44:47 +030033void ieee802154_xmit_worker(struct work_struct *work)
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000034{
Lennert Buytenhekc22ff7b2015-07-21 17:44:47 +030035 struct ieee802154_local *local =
36 container_of(work, struct ieee802154_local, tx_work);
37 struct sk_buff *skb = local->tx_skb;
Alexander Aring409c3b02014-10-26 09:37:12 +010038 struct net_device *dev = skb->dev;
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000039 int res;
40
Alexander Aring59cb3002014-10-28 18:21:21 +010041 res = drv_xmit_sync(local, skb);
Alexander Aring6001d522014-10-26 09:37:09 +010042 if (res)
43 goto err_tx;
44
Alexander Aring61f2dcb2014-11-12 19:51:56 +010045 ieee802154_xmit_complete(&local->hw, skb, false);
Alexander Aring6001d522014-10-26 09:37:09 +010046
Alexander Aring409c3b02014-10-26 09:37:12 +010047 dev->stats.tx_packets++;
48 dev->stats.tx_bytes += skb->len;
49
Alexander Aring6001d522014-10-26 09:37:09 +010050 return;
51
52err_tx:
53 /* Restart the netif queue on each sub_if_data object. */
54 ieee802154_wake_queue(&local->hw);
Alexander Aring6001d522014-10-26 09:37:09 +010055 kfree_skb(skb);
Alexander Aring409c3b02014-10-26 09:37:12 +010056 netdev_dbg(dev, "transmission failed\n");
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000057}
58
Alexander Aringdc67c6b2014-10-26 09:37:04 +010059static netdev_tx_t
Alexander Aringe5e584f2014-10-26 09:37:13 +010060ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000061{
Alexander Aring409c3b02014-10-26 09:37:12 +010062 struct net_device *dev = skb->dev;
Alexander Aringed0a5dc2014-10-26 09:37:08 +010063 int ret;
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000064
Alexander Aring90386a72014-10-29 21:34:34 +010065 if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
Alexander Aringf9c52832018-07-02 16:32:03 -040066 struct sk_buff *nskb;
67 u16 crc;
Varka Bhadram4710d802014-07-02 09:01:09 +053068
Alexander Aringf9c52832018-07-02 16:32:03 -040069 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);
Alexander Aring061ef8f2014-10-27 17:13:28 +010081 put_unaligned_le16(crc, skb_put(skb, 2));
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +000082 }
83
Alan Ottb5992fe2013-04-03 04:00:56 +000084 /* Stop the netif queue on each sub_if_data object. */
Alexander Aring18d60a02014-10-26 09:37:06 +010085 ieee802154_stop_queue(&local->hw);
Alan Ottb5992fe2013-04-03 04:00:56 +000086
Alexander Aringed0a5dc2014-10-26 09:37:08 +010087 /* async is priority, otherwise sync is fallback */
88 if (local->ops->xmit_async) {
Alexander Aring59cb3002014-10-28 18:21:21 +010089 ret = drv_xmit_async(local, skb);
Alexander Aringed0a5dc2014-10-26 09:37:08 +010090 if (ret) {
91 ieee802154_wake_queue(&local->hw);
92 goto err_tx;
93 }
Alexander Aring409c3b02014-10-26 09:37:12 +010094
95 dev->stats.tx_packets++;
96 dev->stats.tx_bytes += skb->len;
Alexander Aringed0a5dc2014-10-26 09:37:08 +010097 } else {
Lennert Buytenhekc22ff7b2015-07-21 17:44:47 +030098 local->tx_skb = skb;
99 queue_work(local->workqueue, &local->tx_work);
Alexander Aringed0a5dc2014-10-26 09:37:08 +0100100 }
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +0000101
102 return NETDEV_TX_OK;
Varka Bhadramf5588912014-08-11 13:25:10 +0200103
104err_tx:
105 kfree_skb(skb);
106 return NETDEV_TX_OK;
alex.bluesman.smirnov@gmail.com5b641eb2012-05-15 20:50:22 +0000107}
Alexander Aring50c6fb92014-10-26 09:37:01 +0100108
Alexander Aringe5e584f2014-10-26 09:37:13 +0100109netdev_tx_t
110ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
Alexander Aring50c6fb92014-10-26 09:37:01 +0100111{
112 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
Alexander Aring50c6fb92014-10-26 09:37:01 +0100113
114 skb->skb_iif = dev->ifindex;
Alexander Aring50c6fb92014-10-26 09:37:01 +0100115
Alexander Aringe5e584f2014-10-26 09:37:13 +0100116 return ieee802154_tx(sdata->local, skb);
Alexander Aring50c6fb92014-10-26 09:37:01 +0100117}
118
Alexander Aringe5e584f2014-10-26 09:37:13 +0100119netdev_tx_t
120ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
Alexander Aring50c6fb92014-10-26 09:37:01 +0100121{
122 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
Alexander Aring50c6fb92014-10-26 09:37:01 +0100123 int rc;
124
Alexander Aringd58a2fa2015-09-28 09:00:26 +0200125 /* 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 */
Alexander Aring50c6fb92014-10-26 09:37:01 +0100129 rc = mac802154_llsec_encrypt(&sdata->sec, skb);
130 if (rc) {
Alexander Aringcfa626c2014-10-26 09:37:10 +0100131 netdev_warn(dev, "encryption failed: %i\n", rc);
Alexander Aring50c6fb92014-10-26 09:37:01 +0100132 kfree_skb(skb);
133 return NETDEV_TX_OK;
134 }
135
136 skb->skb_iif = dev->ifindex;
Alexander Aring50c6fb92014-10-26 09:37:01 +0100137
Alexander Aringe5e584f2014-10-26 09:37:13 +0100138 return ieee802154_tx(sdata->local, skb);
Alexander Aring50c6fb92014-10-26 09:37:01 +0100139}