alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 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 | * |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 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 | |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 24 | #include <net/ieee802154_netdev.h> |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 25 | #include <net/mac802154.h> |
Alexander Aring | 5ad60d3 | 2014-10-25 09:41:02 +0200 | [diff] [blame] | 26 | #include <net/cfg802154.h> |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 27 | |
Alexander Aring | 0f1556b | 2014-10-25 09:41:00 +0200 | [diff] [blame] | 28 | #include "ieee802154_i.h" |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 29 | |
| 30 | /* IEEE 802.15.4 transceivers can sleep during the xmit session, so process |
| 31 | * packets through the workqueue. |
| 32 | */ |
| 33 | struct xmit_work { |
| 34 | struct sk_buff *skb; |
| 35 | struct work_struct work; |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 36 | struct ieee802154_local *local; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 37 | u8 chan; |
| 38 | u8 page; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 39 | }; |
| 40 | |
| 41 | static void mac802154_xmit_worker(struct work_struct *work) |
| 42 | { |
| 43 | struct xmit_work *xw = container_of(work, struct xmit_work, work); |
Alexander Aring | 036562f | 2014-10-25 17:16:36 +0200 | [diff] [blame] | 44 | struct ieee802154_sub_if_data *sdata; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 45 | int res; |
| 46 | |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 47 | mutex_lock(&xw->local->phy->pib_lock); |
| 48 | if (xw->local->phy->current_channel != xw->chan || |
| 49 | xw->local->phy->current_page != xw->page) { |
| 50 | res = xw->local->ops->set_channel(&xw->local->hw, |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 51 | xw->page, |
| 52 | xw->chan); |
| 53 | if (res) { |
| 54 | pr_debug("set_channel failed\n"); |
| 55 | goto out; |
| 56 | } |
Alan Ott | 9f7f78b | 2013-04-05 13:03:10 +0000 | [diff] [blame] | 57 | |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 58 | xw->local->phy->current_channel = xw->chan; |
| 59 | xw->local->phy->current_page = xw->page; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 60 | } |
| 61 | |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 62 | res = xw->local->ops->xmit(&xw->local->hw, xw->skb); |
Alan Ott | 7dd43d3 | 2013-04-03 04:00:55 +0000 | [diff] [blame] | 63 | if (res) |
| 64 | pr_debug("transmission failed\n"); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 65 | |
| 66 | out: |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 67 | mutex_unlock(&xw->local->phy->pib_lock); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 68 | |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 69 | /* Restart the netif queue on each sub_if_data object. */ |
| 70 | rcu_read_lock(); |
Alexander Aring | d98be45 | 2014-10-25 17:16:38 +0200 | [diff] [blame] | 71 | list_for_each_entry_rcu(sdata, &xw->local->interfaces, list) |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 72 | netif_wake_queue(sdata->dev); |
| 73 | rcu_read_unlock(); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 74 | |
| 75 | dev_kfree_skb(xw->skb); |
| 76 | |
| 77 | kfree(xw); |
| 78 | } |
| 79 | |
Alexander Aring | 50c6fb9 | 2014-10-26 09:37:01 +0100 | [diff] [blame^] | 80 | static netdev_tx_t mac802154_tx(struct ieee802154_local *local, |
| 81 | struct sk_buff *skb, u8 page, u8 chan) |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 82 | { |
| 83 | struct xmit_work *work; |
Alexander Aring | 036562f | 2014-10-25 17:16:36 +0200 | [diff] [blame] | 84 | struct ieee802154_sub_if_data *sdata; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 85 | |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 86 | if (!(local->phy->channels_supported[page] & (1 << chan))) { |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 87 | WARN_ON(1); |
Varka Bhadram | f558891 | 2014-08-11 13:25:10 +0200 | [diff] [blame] | 88 | goto err_tx; |
alex.bluesman.smirnov@gmail.com | 8a8e28b | 2012-06-25 03:30:13 +0000 | [diff] [blame] | 89 | } |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 90 | |
Alexander Aring | 6074136 | 2014-10-25 17:16:39 +0200 | [diff] [blame] | 91 | mac802154_monitors_rx(local, skb); |
alex.bluesman.smirnov@gmail.com | 72fd5a8 | 2012-06-25 23:24:54 +0000 | [diff] [blame] | 92 | |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 93 | if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 94 | u16 crc = crc_ccitt(0, skb->data, skb->len); |
| 95 | u8 *data = skb_put(skb, 2); |
Varka Bhadram | 4710d80 | 2014-07-02 09:01:09 +0530 | [diff] [blame] | 96 | |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 97 | data[0] = crc & 0xff; |
| 98 | data[1] = crc >> 8; |
| 99 | } |
| 100 | |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 101 | if (skb_cow_head(skb, local->hw.extra_tx_headroom)) |
Varka Bhadram | f558891 | 2014-08-11 13:25:10 +0200 | [diff] [blame] | 102 | goto err_tx; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 103 | |
Varka Bhadram | f558891 | 2014-08-11 13:25:10 +0200 | [diff] [blame] | 104 | work = kzalloc(sizeof(*work), GFP_ATOMIC); |
Alan Ott | fcefbe9 | 2012-11-29 18:25:10 +0000 | [diff] [blame] | 105 | if (!work) { |
| 106 | kfree_skb(skb); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 107 | return NETDEV_TX_BUSY; |
Alan Ott | fcefbe9 | 2012-11-29 18:25:10 +0000 | [diff] [blame] | 108 | } |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 109 | |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 110 | /* Stop the netif queue on each sub_if_data object. */ |
| 111 | rcu_read_lock(); |
Alexander Aring | d98be45 | 2014-10-25 17:16:38 +0200 | [diff] [blame] | 112 | list_for_each_entry_rcu(sdata, &local->interfaces, list) |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 113 | netif_stop_queue(sdata->dev); |
| 114 | rcu_read_unlock(); |
| 115 | |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 116 | INIT_WORK(&work->work, mac802154_xmit_worker); |
| 117 | work->skb = skb; |
Alexander Aring | a5e1ec5 | 2014-10-25 17:16:35 +0200 | [diff] [blame] | 118 | work->local = local; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 119 | work->page = page; |
| 120 | work->chan = chan; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 121 | |
Alexander Aring | f773054 | 2014-10-25 17:16:41 +0200 | [diff] [blame] | 122 | queue_work(local->workqueue, &work->work); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 123 | |
| 124 | return NETDEV_TX_OK; |
Varka Bhadram | f558891 | 2014-08-11 13:25:10 +0200 | [diff] [blame] | 125 | |
| 126 | err_tx: |
| 127 | kfree_skb(skb); |
| 128 | return NETDEV_TX_OK; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 129 | } |
Alexander Aring | 50c6fb9 | 2014-10-26 09:37:01 +0100 | [diff] [blame^] | 130 | |
| 131 | netdev_tx_t mac802154_monitor_xmit(struct sk_buff *skb, struct net_device *dev) |
| 132 | { |
| 133 | struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); |
| 134 | u8 chan, page; |
| 135 | |
| 136 | /* FIXME: locking */ |
| 137 | chan = sdata->local->phy->current_channel; |
| 138 | page = sdata->local->phy->current_page; |
| 139 | |
| 140 | if (chan == MAC802154_CHAN_NONE) /* not initialized */ |
| 141 | return NETDEV_TX_OK; |
| 142 | |
| 143 | if (WARN_ON(page >= WPAN_NUM_PAGES) || |
| 144 | WARN_ON(chan >= WPAN_NUM_CHANNELS)) |
| 145 | return NETDEV_TX_OK; |
| 146 | |
| 147 | skb->skb_iif = dev->ifindex; |
| 148 | dev->stats.tx_packets++; |
| 149 | dev->stats.tx_bytes += skb->len; |
| 150 | |
| 151 | return mac802154_tx(sdata->local, skb, page, chan); |
| 152 | } |
| 153 | |
| 154 | netdev_tx_t mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev) |
| 155 | { |
| 156 | struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); |
| 157 | u8 chan, page; |
| 158 | int rc; |
| 159 | |
| 160 | spin_lock_bh(&sdata->mib_lock); |
| 161 | chan = sdata->chan; |
| 162 | page = sdata->page; |
| 163 | spin_unlock_bh(&sdata->mib_lock); |
| 164 | |
| 165 | if (chan == MAC802154_CHAN_NONE || |
| 166 | page >= WPAN_NUM_PAGES || |
| 167 | chan >= WPAN_NUM_CHANNELS) { |
| 168 | kfree_skb(skb); |
| 169 | return NETDEV_TX_OK; |
| 170 | } |
| 171 | |
| 172 | rc = mac802154_llsec_encrypt(&sdata->sec, skb); |
| 173 | if (rc) { |
| 174 | pr_warn("encryption failed: %i\n", rc); |
| 175 | kfree_skb(skb); |
| 176 | return NETDEV_TX_OK; |
| 177 | } |
| 178 | |
| 179 | skb->skb_iif = dev->ifindex; |
| 180 | dev->stats.tx_packets++; |
| 181 | dev->stats.tx_bytes += skb->len; |
| 182 | |
| 183 | return mac802154_tx(sdata->local, skb, page, chan); |
| 184 | } |