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mac802154: cfg: add suspend and resume callbacks

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This patch introduces suspend and resume callbacks to mac802154. When
doing suspend we calling the stop driver callback which should stop the
receiving of frames. A transceiver should go into low-power mode then.
Calling resume will call the start driver callback, which starts receiving
again and allow to transmit frames.

This was tested only with the fakelb driver and a qemu vm by doing the
following commands:

echo "devices" > /sys/power/pm_test
echo "freeze" > /sys/power/state

while doing some high traffic between two fakelb phys.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-06-24 11:36:36 +02:00 committed by Marcel Holtmann
parent a6cb869b3b
commit 3cf24cf8c3
3 changed files with 54 additions and 2 deletions
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45
net/mac802154/cfg.c
View File

@ -44,6 +44,49 @@ static void ieee802154_del_iface_deprecated(struct wpan_phy *wpan_phy,
ieee802154_if_remove(sdata);
}
#ifdef CONFIG_PM
static int ieee802154_suspend(struct wpan_phy *wpan_phy)
{
struct ieee802154_local *local = wpan_phy_priv(wpan_phy);
if (!local->open_count)
goto suspend;
ieee802154_stop_queue(&local->hw);
synchronize_net();
/* stop hardware - this must stop RX */
ieee802154_stop_device(local);
suspend:
local->suspended = true;
return 0;
}
static int ieee802154_resume(struct wpan_phy *wpan_phy)
{
struct ieee802154_local *local = wpan_phy_priv(wpan_phy);
int ret;
/* nothing to do if HW shouldn't run */
if (!local->open_count)
goto wake_up;
/* restart hardware */
ret = drv_start(local);
if (ret)
return ret;
wake_up:
ieee802154_wake_queue(&local->hw);
local->suspended = false;
return 0;
}
#else
#define ieee802154_suspend NULL
#define ieee802154_resume NULL
#endif
static int
ieee802154_add_iface(struct wpan_phy *phy, const char *name,
unsigned char name_assign_type,
@ -232,6 +275,8 @@ ieee802154_set_lbt_mode(struct wpan_phy *wpan_phy, struct wpan_dev *wpan_dev,
const struct cfg802154_ops mac802154_config_ops = {
.add_virtual_intf_deprecated = ieee802154_add_iface_deprecated,
.del_virtual_intf_deprecated = ieee802154_del_iface_deprecated,
.suspend = ieee802154_suspend,
.resume = ieee802154_resume,
.add_virtual_intf = ieee802154_add_iface,
.del_virtual_intf = ieee802154_del_iface,
.set_channel = ieee802154_set_channel,

1
net/mac802154/ieee802154_i.h
View File

@ -56,6 +56,7 @@ struct ieee802154_local {
struct hrtimer ifs_timer;
bool started;
bool suspended;
struct tasklet_struct tasklet;
struct sk_buff_head skb_queue;

10
net/mac802154/rx.c
View File

@ -253,6 +253,9 @@ void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
WARN_ON_ONCE(softirq_count() == 0);
if (local->suspended)
goto drop;
/* TODO: When a transceiver omits the checksum here, we
* add an own calculated one. This is currently an ugly
* solution because the monitor needs a crc here.
@ -273,8 +276,7 @@ void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
crc = crc_ccitt(0, skb->data, skb->len);
if (crc) {
rcu_read_unlock();
kfree_skb(skb);
return;
goto drop;
}
}
/* remove crc */
@ -283,6 +285,10 @@ void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
__ieee802154_rx_handle_packet(local, skb);
rcu_read_unlock();
return;
drop:
kfree_skb(skb);
}
EXPORT_SYMBOL(ieee802154_rx);