| 5b641ebe |
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 | |
| 28 | #include <net/mac802154.h> |
| 29 | #include <net/wpan-phy.h> |
| 30 | |
| 31 | #include "mac802154.h" |
| 32 | |
| 33 | /* IEEE 802.15.4 transceivers can sleep during the xmit session, so process |
| 34 | * packets through the workqueue. |
| 35 | */ |
| 36 | struct xmit_work { |
| 37 | struct sk_buff *skb; |
| 38 | struct work_struct work; |
| 39 | struct mac802154_priv *priv; |
| 40 | u8 chan; |
| 41 | u8 page; |
| 42 | u8 xmit_attempts; |
| 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); |
| 48 | int res; |
| 49 | |
| 50 | mutex_lock(&xw->priv->phy->pib_lock); |
| 51 | if (xw->priv->phy->current_channel != xw->chan || |
| 52 | xw->priv->phy->current_page != xw->page) { |
| 53 | res = xw->priv->ops->set_channel(&xw->priv->hw, |
| 54 | xw->page, |
| 55 | xw->chan); |
| 56 | if (res) { |
| 57 | pr_debug("set_channel failed\n"); |
| 58 | goto out; |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb); |
| 63 | |
| 64 | out: |
| 65 | mutex_unlock(&xw->priv->phy->pib_lock); |
| 66 | |
| 67 | if (res) { |
| 68 | if (xw->xmit_attempts++ < MAC802154_MAX_XMIT_ATTEMPTS) { |
| 69 | queue_work(xw->priv->dev_workqueue, &xw->work); |
| 70 | return; |
| 71 | } else |
| 72 | pr_debug("transmission failed for %d times", |
| 73 | MAC802154_MAX_XMIT_ATTEMPTS); |
| 74 | } |
| 75 | |
| 76 | dev_kfree_skb(xw->skb); |
| 77 | |
| 78 | kfree(xw); |
| 79 | } |
| 80 | |
| 81 | netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, |
| 82 | u8 page, u8 chan) |
| 83 | { |
| 84 | struct xmit_work *work; |
| 85 | |
| 86 | if (!(priv->phy->channels_supported[page] & (1 << chan))) |
| 87 | WARN_ON(1); |
| 88 | return NETDEV_TX_OK; |
| 89 | |
| 90 | if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { |
| 91 | u16 crc = crc_ccitt(0, skb->data, skb->len); |
| 92 | u8 *data = skb_put(skb, 2); |
| 93 | data[0] = crc & 0xff; |
| 94 | data[1] = crc >> 8; |
| 95 | } |
| 96 | |
| 97 | if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) { |
| 98 | dev_kfree_skb(skb); |
| 99 | return NETDEV_TX_OK; |
| 100 | } |
| 101 | |
| 102 | work = kzalloc(sizeof(struct xmit_work), GFP_ATOMIC); |
| 103 | if (!work) |
| 104 | return NETDEV_TX_BUSY; |
| 105 | |
| 106 | INIT_WORK(&work->work, mac802154_xmit_worker); |
| 107 | work->skb = skb; |
| 108 | work->priv = priv; |
| 109 | work->page = page; |
| 110 | work->chan = chan; |
| 111 | work->xmit_attempts = 0; |
| 112 | |
| 113 | queue_work(priv->dev_workqueue, &work->work); |
| 114 | |
| 115 | return NETDEV_TX_OK; |
| 116 | } |
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