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 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | * |
| 17 | * Written by: |
| 18 | * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> |
| 19 | * Sergey Lapin <slapin@ossfans.org> |
| 20 | * Maxim Gorbachyov <maxim.gorbachev@siemens.com> |
| 21 | * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> |
| 22 | */ |
| 23 | |
| 24 | #include <linux/netdevice.h> |
| 25 | #include <linux/if_arp.h> |
| 26 | #include <linux/crc-ccitt.h> |
| 27 | |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 28 | #include <net/ieee802154_netdev.h> |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 29 | #include <net/mac802154.h> |
| 30 | #include <net/wpan-phy.h> |
| 31 | |
| 32 | #include "mac802154.h" |
| 33 | |
| 34 | /* IEEE 802.15.4 transceivers can sleep during the xmit session, so process |
| 35 | * packets through the workqueue. |
| 36 | */ |
| 37 | struct xmit_work { |
| 38 | struct sk_buff *skb; |
| 39 | struct work_struct work; |
| 40 | struct mac802154_priv *priv; |
| 41 | u8 chan; |
| 42 | u8 page; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 43 | }; |
| 44 | |
| 45 | static void mac802154_xmit_worker(struct work_struct *work) |
| 46 | { |
| 47 | struct xmit_work *xw = container_of(work, struct xmit_work, work); |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 48 | struct mac802154_sub_if_data *sdata; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 49 | int res; |
| 50 | |
| 51 | mutex_lock(&xw->priv->phy->pib_lock); |
| 52 | if (xw->priv->phy->current_channel != xw->chan || |
| 53 | xw->priv->phy->current_page != xw->page) { |
| 54 | res = xw->priv->ops->set_channel(&xw->priv->hw, |
| 55 | xw->page, |
| 56 | xw->chan); |
| 57 | if (res) { |
| 58 | pr_debug("set_channel failed\n"); |
| 59 | goto out; |
| 60 | } |
Alan Ott | 9f7f78b | 2013-04-05 13:03:10 +0000 | [diff] [blame] | 61 | |
| 62 | xw->priv->phy->current_channel = xw->chan; |
| 63 | xw->priv->phy->current_page = xw->page; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb); |
Alan Ott | 7dd43d3 | 2013-04-03 04:00:55 +0000 | [diff] [blame] | 67 | if (res) |
| 68 | pr_debug("transmission failed\n"); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 69 | |
| 70 | out: |
| 71 | mutex_unlock(&xw->priv->phy->pib_lock); |
| 72 | |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 73 | /* Restart the netif queue on each sub_if_data object. */ |
| 74 | rcu_read_lock(); |
| 75 | list_for_each_entry_rcu(sdata, &xw->priv->slaves, list) |
| 76 | netif_wake_queue(sdata->dev); |
| 77 | rcu_read_unlock(); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 78 | |
| 79 | dev_kfree_skb(xw->skb); |
| 80 | |
| 81 | kfree(xw); |
| 82 | } |
| 83 | |
| 84 | netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, |
| 85 | u8 page, u8 chan) |
| 86 | { |
| 87 | struct xmit_work *work; |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 88 | struct mac802154_sub_if_data *sdata; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 89 | |
alex.bluesman.smirnov@gmail.com | 8a8e28b | 2012-06-25 03:30:13 +0000 | [diff] [blame] | 90 | if (!(priv->phy->channels_supported[page] & (1 << chan))) { |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 91 | WARN_ON(1); |
Alan Ott | fcefbe9 | 2012-11-29 18:25:10 +0000 | [diff] [blame] | 92 | kfree_skb(skb); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 93 | return NETDEV_TX_OK; |
alex.bluesman.smirnov@gmail.com | 8a8e28b | 2012-06-25 03:30:13 +0000 | [diff] [blame] | 94 | } |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 95 | |
alex.bluesman.smirnov@gmail.com | 72fd5a8 | 2012-06-25 23:24:54 +0000 | [diff] [blame] | 96 | mac802154_monitors_rx(mac802154_to_priv(&priv->hw), skb); |
| 97 | |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 98 | if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { |
| 99 | u16 crc = crc_ccitt(0, skb->data, skb->len); |
| 100 | u8 *data = skb_put(skb, 2); |
Varka Bhadram | 4710d80 | 2014-07-02 09:01:09 +0530 | [diff] [blame] | 101 | |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 102 | data[0] = crc & 0xff; |
| 103 | data[1] = crc >> 8; |
| 104 | } |
| 105 | |
| 106 | if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) { |
Alan Ott | 92a2ec7 | 2012-11-29 18:25:11 +0000 | [diff] [blame] | 107 | kfree_skb(skb); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 108 | return NETDEV_TX_OK; |
| 109 | } |
| 110 | |
| 111 | work = kzalloc(sizeof(struct xmit_work), GFP_ATOMIC); |
Alan Ott | fcefbe9 | 2012-11-29 18:25:10 +0000 | [diff] [blame] | 112 | if (!work) { |
| 113 | kfree_skb(skb); |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 114 | return NETDEV_TX_BUSY; |
Alan Ott | fcefbe9 | 2012-11-29 18:25:10 +0000 | [diff] [blame] | 115 | } |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 116 | |
Alan Ott | b5992fe | 2013-04-03 04:00:56 +0000 | [diff] [blame] | 117 | /* Stop the netif queue on each sub_if_data object. */ |
| 118 | rcu_read_lock(); |
| 119 | list_for_each_entry_rcu(sdata, &priv->slaves, list) |
| 120 | netif_stop_queue(sdata->dev); |
| 121 | rcu_read_unlock(); |
| 122 | |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 123 | INIT_WORK(&work->work, mac802154_xmit_worker); |
| 124 | work->skb = skb; |
| 125 | work->priv = priv; |
| 126 | work->page = page; |
| 127 | work->chan = chan; |
alex.bluesman.smirnov@gmail.com | 5b641eb | 2012-05-15 20:50:22 +0000 | [diff] [blame] | 128 | |
| 129 | queue_work(priv->dev_workqueue, &work->work); |
| 130 | |
| 131 | return NETDEV_TX_OK; |
| 132 | } |