// 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; } 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(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(local, sdata, skb); ieee802154_mlme_op_post(local); return ret; } 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_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); }