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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2007-2012 Siemens AG
*
* 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 <asm/unaligned.h>
#include <net/rtnetlink.h>
#include <net/ieee802154_netdev.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>
#include "ieee802154_i.h"
#include "driver-ops.h"
void ieee802154_xmit_sync_worker(struct work_struct *work)
{
struct ieee802154_local *local =
container_of(work, struct ieee802154_local, sync_tx_work);
struct sk_buff *skb = local->tx_skb;
struct net_device *dev = skb->dev;
int res;
res = drv_xmit_sync(local, skb);
if (res)
goto err_tx;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
ieee802154_xmit_complete(&local->hw, skb, false);
return;
err_tx:
/* Restart the netif queue on each sub_if_data object. */
ieee802154_release_queue(local);
if (!atomic_dec_and_test(&local->phy->ongoing_txs))
wake_up(&local->phy->sync_txq);
kfree_skb(skb);
netdev_dbg(dev, "transmission failed\n");
}
static netdev_tx_t
ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
int ret;
if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
struct sk_buff *nskb;
u16 crc;
if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
GFP_ATOMIC);
if (likely(nskb)) {
consume_skb(skb);
skb = nskb;
} else {
goto err_free_skb;
}
}
crc = crc_ccitt(0, skb->data, skb->len);
put_unaligned_le16(crc, skb_put(skb, 2));
}
/* Stop the netif queue on each sub_if_data object. */
ieee802154_hold_queue(local);
atomic_inc(&local->phy->ongoing_txs);
/* Drivers should preferably implement the async callback. In some rare
* cases they only provide a sync callback which we will use as a
* fallback.
*/
if (local->ops->xmit_async) {
unsigned int len = skb->len;
ret = drv_xmit_async(local, skb);
if (ret)
goto err_wake_netif_queue;
dev->stats.tx_packets++;
dev->stats.tx_bytes += len;
} else {
local->tx_skb = skb;
queue_work(local->workqueue, &local->sync_tx_work);
}
return NETDEV_TX_OK;
err_wake_netif_queue:
ieee802154_release_queue(local);
if (!atomic_dec_and_test(&local->phy->ongoing_txs))
wake_up(&local->phy->sync_txq);
err_free_skb:
kfree_skb(skb);
return NETDEV_TX_OK;
}
static int ieee802154_sync_queue(struct ieee802154_local *local)
{
int ret;
ieee802154_hold_queue(local);
ieee802154_disable_queue(local);
wait_event(local->phy->sync_txq, !atomic_read(&local->phy->ongoing_txs));
ret = local->tx_result;
ieee802154_release_queue(local);
return ret;
}
int ieee802154_sync_and_hold_queue(struct ieee802154_local *local)
{
int ret;
ieee802154_hold_queue(local);
ret = ieee802154_sync_queue(local);
set_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags);
return ret;
}
static bool ieee802154_netif_is_down(struct ieee802154_local *local)
{
struct ieee802154_sub_if_data *sdata;
bool is_down = true;
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!sdata->dev)
continue;
is_down = !netif_running(sdata->dev);
if (is_down)
break;
}
rcu_read_unlock();
return is_down;
}
int ieee802154_mlme_op_pre(struct ieee802154_local *local)
{
return ieee802154_sync_and_hold_queue(local);
}
int ieee802154_mlme_tx(struct ieee802154_local *local, struct sk_buff *skb)
{
int ret;
/* Avoid possible calls to ->ndo_stop() when we asynchronously perform
* MLME transmissions.
*/
rtnl_lock();
/* Ensure the device was not stopped, otherwise error out */
if (!local->open_count) {
rtnl_unlock();
return -ENETDOWN;
}
/* Warn if the ieee802154 core thinks MLME frames can be sent while the
* net interface expects this cannot happen.
*/
if (WARN_ON_ONCE(ieee802154_netif_is_down(local))) {
rtnl_unlock();
return -ENETDOWN;
}
ieee802154_tx(local, skb);
ret = ieee802154_sync_queue(local);
rtnl_unlock();
return ret;
}
void ieee802154_mlme_op_post(struct ieee802154_local *local)
{
ieee802154_release_queue(local);
}
int ieee802154_mlme_tx_one(struct ieee802154_local *local, struct sk_buff *skb)
{
int ret;
ieee802154_mlme_op_pre(local);
ret = ieee802154_mlme_tx(local, skb);
ieee802154_mlme_op_post(local);
return ret;
}
static bool ieee802154_queue_is_stopped(struct ieee802154_local *local)
{
return test_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags);
}
static netdev_tx_t
ieee802154_hot_tx(struct ieee802154_local *local, struct sk_buff *skb)
{
/* Warn if the net interface tries to transmit frames while the
* ieee802154 core assumes the queue is stopped.
*/
WARN_ON_ONCE(ieee802154_queue_is_stopped(local));
return ieee802154_tx(local, skb);
}
netdev_tx_t
ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
skb->skb_iif = dev->ifindex;
return ieee802154_hot_tx(sdata->local, skb);
}
netdev_tx_t
ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
int rc;
/* TODO we should move it to wpan_dev_hard_header and dev_hard_header
* functions. The reason is wireshark will show a mac header which is
* with security fields but the payload is not encrypted.
*/
rc = mac802154_llsec_encrypt(&sdata->sec, skb);
if (rc) {
netdev_warn(dev, "encryption failed: %i\n", rc);
kfree_skb(skb);
return NETDEV_TX_OK;
}
skb->skb_iif = dev->ifindex;
return ieee802154_hot_tx(sdata->local, skb);
}
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