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Message-Id: <1322663029-3880-1-git-send-email-alex.bluesman.smirnov@gmail.com>
Date: Wed, 30 Nov 2011 17:23:49 +0300
From: Alexander Smirnov <alex.bluesman.smirnov@...il.com>
To: dbaryshkov@...il.com
Cc: linux-zigbee-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
davem@...emloft.net,
Alexander Smirnov <alex.bluesman.smirnov@...il.com>
Subject: [PATCH 04/12] [MAC802154] mac802154: TX data path
Main TX data path implementation between upper and physical layers.
Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@...il.com>
---
net/mac802154/Makefile | 2 +-
net/mac802154/ieee802154_dev.c | 3 +-
net/mac802154/tx.c | 102 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 105 insertions(+), 2 deletions(-)
create mode 100644 net/mac802154/tx.c
diff --git a/net/mac802154/Makefile b/net/mac802154/Makefile
index e00fe47..490beef 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/ieee802154_dev.c b/net/mac802154/ieee802154_dev.c
index 42f95b2..e90d336 100644
--- a/net/mac802154/ieee802154_dev.c
+++ b/net/mac802154/ieee802154_dev.c
@@ -31,7 +31,8 @@ struct ieee802154_dev *ieee802154_alloc_device(size_t priv_size,
struct wpan_phy *phy;
struct mac802154_priv *priv;
- if (!ops || !ops->xmit || !ops->ed || !ops->start || !ops->stop) {
+ if (!ops || !ops->xmit || !ops->ed || !ops->start || !ops->stop ||
+ !ops->set_channel) {
printk(KERN_ERR
"Undefined IEEE802.15.4 device operations\n");
return NULL;
diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
new file mode 100644
index 0000000..3325cde
--- /dev/null
+++ b/net/mac802154/tx.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2007-2011 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@...il.com>
+ * Sergey Lapin <slapin@...fans.org>
+ * Maxim Gorbachyov <maxim.gorbachev@...mens.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"
+
+struct xmit_work {
+ struct sk_buff *skb;
+ struct work_struct work;
+ struct mac802154_priv *priv;
+ u8 page;
+ u8 chan;
+};
+
+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("(%s): set_channel failed\n", __func__);
+ goto out;
+ }
+ }
+
+ res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb);
+
+out:
+ mutex_unlock(&xw->priv->phy->pib_lock);
+
+ /* FIXME: result processing and/or requeue!!! */
+ 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 (WARN_ON(!(priv->phy->channels_supported[page] &
+ (1 << chan))))
+ 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;
+
+ queue_work(priv->dev_workqueue, &work->work);
+
+ return NETDEV_TX_OK;
+}
--
1.7.2.3
--
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