summaryrefslogtreecommitdiffstats
path: root/net/mac802154/tx.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/mac802154/tx.c')
-rw-r--r--net/mac802154/tx.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
new file mode 100644
index 000000000..2a6f1ed76
--- /dev/null
+++ b/net/mac802154/tx.c
@@ -0,0 +1,253 @@
+// 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-16 21:11:22 +0000