diff options
Diffstat (limited to 'net/mac802154')
| -rw-r--r-- | net/mac802154/Makefile | 2 | ||||
| -rw-r--r-- | net/mac802154/mac802154.h | 5 | ||||
| -rw-r--r-- | net/mac802154/tx.c | 116 |
3 files changed, 122 insertions, 1 deletions
diff --git a/net/mac802154/Makefile b/net/mac802154/Makefile index e00fe474dce4..490beef7176e 100644 --- a/net/mac802154/Makefile +++ b/net/mac802154/Makefile @@ -1,2 +1,2 @@ obj-$(CONFIG_MAC802154) += mac802154.o -mac802154-objs := ieee802154_dev.o rx.o +mac802154-objs := ieee802154_dev.o rx.o tx.o diff --git a/net/mac802154/mac802154.h b/net/mac802154/mac802154.h index 980d0a24040e..4f2d97506c6a 100644 --- a/net/mac802154/mac802154.h +++ b/net/mac802154/mac802154.h @@ -60,4 +60,9 @@ struct mac802154_priv { #define mac802154_to_priv(_hw) container_of(_hw, struct mac802154_priv, hw) +#define MAC802154_MAX_XMIT_ATTEMPTS 3 + +netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, + u8 page, u8 chan); + #endif /* MAC802154_H */ diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c new file mode 100644 index 000000000000..8781d8f904d9 --- /dev/null +++ b/net/mac802154/tx.c @@ -0,0 +1,116 @@ +/* + * Copyright 2007-2012 Siemens AG + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Written by: + * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> + * Sergey Lapin <slapin@ossfans.org> + * Maxim Gorbachyov <maxim.gorbachev@siemens.com> + * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> + */ + +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/crc-ccitt.h> + +#include <net/mac802154.h> +#include <net/wpan-phy.h> + +#include "mac802154.h" + +/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process + * packets through the workqueue. + */ +struct xmit_work { + struct sk_buff *skb; + struct work_struct work; + struct mac802154_priv *priv; + u8 chan; + u8 page; + u8 xmit_attempts; +}; + +static void mac802154_xmit_worker(struct work_struct *work) +{ + struct xmit_work *xw = container_of(work, struct xmit_work, work); + int res; + + mutex_lock(&xw->priv->phy->pib_lock); + if (xw->priv->phy->current_channel != xw->chan || + xw->priv->phy->current_page != xw->page) { + res = xw->priv->ops->set_channel(&xw->priv->hw, + xw->page, + xw->chan); + if (res) { + pr_debug("set_channel failed\n"); + goto out; + } + } + + res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb); + +out: + mutex_unlock(&xw->priv->phy->pib_lock); + + if (res) { + if (xw->xmit_attempts++ < MAC802154_MAX_XMIT_ATTEMPTS) { + queue_work(xw->priv->dev_workqueue, &xw->work); + return; + } else + pr_debug("transmission failed for %d times", + MAC802154_MAX_XMIT_ATTEMPTS); + } + + dev_kfree_skb(xw->skb); + + kfree(xw); +} + +netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, + u8 page, u8 chan) +{ + struct xmit_work *work; + + if (!(priv->phy->channels_supported[page] & (1 << chan))) + WARN_ON(1); + return NETDEV_TX_OK; + + if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { + u16 crc = crc_ccitt(0, skb->data, skb->len); + u8 *data = skb_put(skb, 2); + data[0] = crc & 0xff; + data[1] = crc >> 8; + } + + if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) { + dev_kfree_skb(skb); + return NETDEV_TX_OK; + } + + work = kzalloc(sizeof(struct xmit_work), GFP_ATOMIC); + if (!work) + return NETDEV_TX_BUSY; + + INIT_WORK(&work->work, mac802154_xmit_worker); + work->skb = skb; + work->priv = priv; + work->page = page; + work->chan = chan; + work->xmit_attempts = 0; + + queue_work(priv->dev_workqueue, &work->work); + + return NETDEV_TX_OK; +} |