// 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 <linux/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_INC(dev, tx_packets);	DEV_STATS_ADD(dev, 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_tieee802154_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_INC(dev, tx_packets);		DEV_STATS_ADD(dev, 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;} int ieee802154_mlme_op_pre(struct ieee802154_local *local){	return ieee802154_sync_and_hold_queue(local);} int ieee802154_mlme_tx_locked(struct ieee802154_local *local,			      struct ieee802154_sub_if_data *sdata,			      struct sk_buff *skb){	/* Avoid possible calls to ->ndo_stop() when we asynchronously perform	 * MLME transmissions.	 */	ASSERT_RTNL(); 	/* Ensure the device was not stopped, otherwise error out */	if (!local->open_count)		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(!netif_running(sdata->dev)))		return -ENETDOWN; 	ieee802154_tx(local, skb);	return ieee802154_sync_queue(local);} int ieee802154_mlme_tx(struct ieee802154_local *local,		       struct ieee802154_sub_if_data *sdata,		       struct sk_buff *skb){	int ret; 	rtnl_lock();	ret = ieee802154_mlme_tx_locked(local, sdata, skb);	rtnl_unlock(); 	return ret;} void ieee802154_mlme_op_post(struct ieee802154_local *local){	ieee802154_release_queue(local);} int ieee802154_mlme_tx_one_locked(struct ieee802154_local *local,				  struct ieee802154_sub_if_data *sdata,				  struct sk_buff *skb){	int ret; 	ieee802154_mlme_op_pre(local);	ret = ieee802154_mlme_tx_locked(local, sdata, 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_tieee802154_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_tieee802154_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_tieee802154_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);}