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dd18096256
These have the exact same behavior as before, except they expect the rtnl to be already taken (and will complain otherwise). This allows performing MLME transmissions from different contexts. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Alexander Aring <aahringo@redhat.com> Link: https://lore.kernel.org/r/20230103165644.432209-6-miquel.raynal@bootlin.com Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
254 lines
5.9 KiB
C
254 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2007-2012 Siemens AG
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*
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* Written by:
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Sergey Lapin <slapin@ossfans.org>
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* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/crc-ccitt.h>
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#include <asm/unaligned.h>
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#include <net/rtnetlink.h>
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#include <net/ieee802154_netdev.h>
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#include <net/mac802154.h>
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#include <net/cfg802154.h>
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#include "ieee802154_i.h"
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#include "driver-ops.h"
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void ieee802154_xmit_sync_worker(struct work_struct *work)
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{
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struct ieee802154_local *local =
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container_of(work, struct ieee802154_local, sync_tx_work);
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struct sk_buff *skb = local->tx_skb;
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struct net_device *dev = skb->dev;
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int res;
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res = drv_xmit_sync(local, skb);
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if (res)
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goto err_tx;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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ieee802154_xmit_complete(&local->hw, skb, false);
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return;
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err_tx:
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/* Restart the netif queue on each sub_if_data object. */
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ieee802154_release_queue(local);
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if (atomic_dec_and_test(&local->phy->ongoing_txs))
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wake_up(&local->phy->sync_txq);
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kfree_skb(skb);
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netdev_dbg(dev, "transmission failed\n");
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}
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static netdev_tx_t
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ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
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{
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struct net_device *dev = skb->dev;
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int ret;
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if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
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struct sk_buff *nskb;
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u16 crc;
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if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
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nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
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GFP_ATOMIC);
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if (likely(nskb)) {
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consume_skb(skb);
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skb = nskb;
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} else {
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goto err_free_skb;
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}
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}
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crc = crc_ccitt(0, skb->data, skb->len);
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put_unaligned_le16(crc, skb_put(skb, 2));
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}
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/* Stop the netif queue on each sub_if_data object. */
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ieee802154_hold_queue(local);
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atomic_inc(&local->phy->ongoing_txs);
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/* Drivers should preferably implement the async callback. In some rare
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* cases they only provide a sync callback which we will use as a
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* fallback.
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*/
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if (local->ops->xmit_async) {
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unsigned int len = skb->len;
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ret = drv_xmit_async(local, skb);
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if (ret)
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goto err_wake_netif_queue;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += len;
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} else {
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local->tx_skb = skb;
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queue_work(local->workqueue, &local->sync_tx_work);
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}
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return NETDEV_TX_OK;
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err_wake_netif_queue:
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ieee802154_release_queue(local);
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if (atomic_dec_and_test(&local->phy->ongoing_txs))
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wake_up(&local->phy->sync_txq);
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err_free_skb:
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kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static int ieee802154_sync_queue(struct ieee802154_local *local)
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{
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int ret;
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ieee802154_hold_queue(local);
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ieee802154_disable_queue(local);
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wait_event(local->phy->sync_txq, !atomic_read(&local->phy->ongoing_txs));
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ret = local->tx_result;
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ieee802154_release_queue(local);
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return ret;
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}
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int ieee802154_sync_and_hold_queue(struct ieee802154_local *local)
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{
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int ret;
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ieee802154_hold_queue(local);
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ret = ieee802154_sync_queue(local);
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set_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags);
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return ret;
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}
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int ieee802154_mlme_op_pre(struct ieee802154_local *local)
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{
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return ieee802154_sync_and_hold_queue(local);
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}
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int ieee802154_mlme_tx_locked(struct ieee802154_local *local,
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struct ieee802154_sub_if_data *sdata,
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struct sk_buff *skb)
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{
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/* Avoid possible calls to ->ndo_stop() when we asynchronously perform
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* MLME transmissions.
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*/
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ASSERT_RTNL();
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/* Ensure the device was not stopped, otherwise error out */
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if (!local->open_count)
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return -ENETDOWN;
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/* Warn if the ieee802154 core thinks MLME frames can be sent while the
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* net interface expects this cannot happen.
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*/
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if (WARN_ON_ONCE(!netif_running(sdata->dev)))
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return -ENETDOWN;
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ieee802154_tx(local, skb);
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return ieee802154_sync_queue(local);
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}
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int ieee802154_mlme_tx(struct ieee802154_local *local,
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struct ieee802154_sub_if_data *sdata,
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struct sk_buff *skb)
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{
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int ret;
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rtnl_lock();
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ret = ieee802154_mlme_tx_locked(local, sdata, skb);
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rtnl_unlock();
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return ret;
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}
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void ieee802154_mlme_op_post(struct ieee802154_local *local)
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{
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ieee802154_release_queue(local);
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}
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int ieee802154_mlme_tx_one(struct ieee802154_local *local,
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struct ieee802154_sub_if_data *sdata,
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struct sk_buff *skb)
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{
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int ret;
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ieee802154_mlme_op_pre(local);
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ret = ieee802154_mlme_tx(local, sdata, skb);
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ieee802154_mlme_op_post(local);
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return ret;
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}
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int ieee802154_mlme_tx_one_locked(struct ieee802154_local *local,
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struct ieee802154_sub_if_data *sdata,
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struct sk_buff *skb)
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{
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int ret;
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ieee802154_mlme_op_pre(local);
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ret = ieee802154_mlme_tx_locked(local, sdata, skb);
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ieee802154_mlme_op_post(local);
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return ret;
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}
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static bool ieee802154_queue_is_stopped(struct ieee802154_local *local)
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{
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return test_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags);
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}
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static netdev_tx_t
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ieee802154_hot_tx(struct ieee802154_local *local, struct sk_buff *skb)
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{
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/* Warn if the net interface tries to transmit frames while the
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* ieee802154 core assumes the queue is stopped.
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*/
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WARN_ON_ONCE(ieee802154_queue_is_stopped(local));
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return ieee802154_tx(local, skb);
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}
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netdev_tx_t
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ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
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skb->skb_iif = dev->ifindex;
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return ieee802154_hot_tx(sdata->local, skb);
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}
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netdev_tx_t
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ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
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int rc;
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/* TODO we should move it to wpan_dev_hard_header and dev_hard_header
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* functions. The reason is wireshark will show a mac header which is
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* with security fields but the payload is not encrypted.
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*/
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rc = mac802154_llsec_encrypt(&sdata->sec, skb);
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if (rc) {
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netdev_warn(dev, "encryption failed: %i\n", rc);
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kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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skb->skb_iif = dev->ifindex;
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return ieee802154_hot_tx(sdata->local, skb);
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}
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