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authorAlexander Aring <alex.aring@gmail.com>2014-11-12 21:51:56 +0300
committerMarcel Holtmann <marcel@holtmann.org>2014-11-13 06:51:58 +0300
commit61f2dcba9a03d4fd9342f0d6821af0a46c7098e9 (patch)
tree0244a0a47ebe5e22ae41ecff1d7f897c253fef6e /net
parenta930430b047a0cc118bfc47ca54fcdfbadf091d2 (diff)
downloadlinux-61f2dcba9a03d4fd9342f0d6821af0a46c7098e9.tar.xz
mac802154: add interframe spacing time handling
This patch adds a new interframe spacing time handling into mac802154 layer. Interframe spacing time is a time period between each transmit. This patch adds a high resolution timer into mac802154 and starts on xmit complete with corresponding interframe spacing expire time if ifs_handling is true. We make it variable because it depends if interframe spacing time is handled by transceiver or mac802154. At the timer complete function we wake the netdev queue again. This avoids new frame transmit in range of interframe spacing time. For synced driver we add no handling of interframe spacing time. This is currently a lack of support in all synced xmit drivers. I suppose it's working because the latency of workqueue which is needed to call spi_sync. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net')
-rw-r--r--net/mac802154/ieee802154_i.h4
-rw-r--r--net/mac802154/iface.c2
-rw-r--r--net/mac802154/main.c17
-rw-r--r--net/mac802154/tx.c2
-rw-r--r--net/mac802154/util.c32
5 files changed, 53 insertions, 4 deletions
diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
index 69cb585e162f..c5b231047b60 100644
--- a/net/mac802154/ieee802154_i.h
+++ b/net/mac802154/ieee802154_i.h
@@ -20,6 +20,7 @@
#define __IEEE802154_I_H
#include <linux/mutex.h>
+#include <linux/hrtimer.h>
#include <net/cfg802154.h>
#include <net/mac802154.h>
#include <net/ieee802154_netdev.h>
@@ -51,6 +52,8 @@ struct ieee802154_local {
*/
struct workqueue_struct *workqueue;
+ struct hrtimer ifs_timer;
+
bool started;
struct tasklet_struct tasklet;
@@ -127,6 +130,7 @@ ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev);
void mac802154_wpan_setup(struct net_device *dev);
netdev_tx_t
ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev);
+enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer);
/* MIB callbacks */
void mac802154_dev_set_short_addr(struct net_device *dev, __le16 val);
diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c
index ec92b48d1b0b..feb064715d1f 100644
--- a/net/mac802154/iface.c
+++ b/net/mac802154/iface.c
@@ -246,6 +246,8 @@ static int mac802154_slave_close(struct net_device *dev)
ASSERT_RTNL();
+ hrtimer_cancel(&local->ifs_timer);
+
netif_stop_queue(dev);
local->open_count--;
diff --git a/net/mac802154/main.c b/net/mac802154/main.c
index 46c76e005446..0af1be64e8ad 100644
--- a/net/mac802154/main.c
+++ b/net/mac802154/main.c
@@ -125,6 +125,18 @@ void ieee802154_free_hw(struct ieee802154_hw *hw)
}
EXPORT_SYMBOL(ieee802154_free_hw);
+static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
+{
+ /* TODO warn on empty symbol_duration
+ * Should be done when all drivers sets this value.
+ */
+
+ wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD *
+ wpan_phy->symbol_duration;
+ wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD *
+ wpan_phy->symbol_duration;
+}
+
int ieee802154_register_hw(struct ieee802154_hw *hw)
{
struct ieee802154_local *local = hw_to_local(hw);
@@ -138,8 +150,13 @@ int ieee802154_register_hw(struct ieee802154_hw *hw)
goto out;
}
+ hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ local->ifs_timer.function = ieee802154_xmit_ifs_timer;
+
wpan_phy_set_dev(local->phy, local->hw.parent);
+ ieee802154_setup_wpan_phy_pib(local->phy);
+
rc = wpan_phy_register(local->phy);
if (rc < 0)
goto out_wq;
diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
index cc37b77f2632..c62e95695c78 100644
--- a/net/mac802154/tx.c
+++ b/net/mac802154/tx.c
@@ -60,7 +60,7 @@ static void ieee802154_xmit_worker(struct work_struct *work)
if (res)
goto err_tx;
- ieee802154_xmit_complete(&local->hw, skb);
+ ieee802154_xmit_complete(&local->hw, skb, false);
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
diff --git a/net/mac802154/util.c b/net/mac802154/util.c
index 9a04e4a8e50f..5fc979027919 100644
--- a/net/mac802154/util.c
+++ b/net/mac802154/util.c
@@ -50,9 +50,35 @@ void ieee802154_stop_queue(struct ieee802154_hw *hw)
}
EXPORT_SYMBOL(ieee802154_stop_queue);
-void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb)
+enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer)
{
- ieee802154_wake_queue(hw);
- consume_skb(skb);
+ struct ieee802154_local *local =
+ container_of(timer, struct ieee802154_local, ifs_timer);
+
+ ieee802154_wake_queue(&local->hw);
+
+ return HRTIMER_NORESTART;
+}
+
+void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
+ bool ifs_handling)
+{
+ if (ifs_handling) {
+ struct ieee802154_local *local = hw_to_local(hw);
+
+ if (skb->len > 18)
+ hrtimer_start(&local->ifs_timer,
+ ktime_set(0, hw->phy->lifs_period * NSEC_PER_USEC),
+ HRTIMER_MODE_REL);
+ else
+ hrtimer_start(&local->ifs_timer,
+ ktime_set(0, hw->phy->sifs_period * NSEC_PER_USEC),
+ HRTIMER_MODE_REL);
+
+ consume_skb(skb);
+ } else {
+ ieee802154_wake_queue(hw);
+ consume_skb(skb);
+ }
}
EXPORT_SYMBOL(ieee802154_xmit_complete);