mac802154: use atomic ops for sequence incrementation

This patch will use atomic operations for sequence number incrementation
while MAC header generation. Upper layers like af_802154 or 6LoWPAN
could call this function in a parallel context while generating 802.15.4
MAC header before queuing into wpan interfaces transmit queue.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

5 files changed, 6 insertions, 22 deletions

diff --git a/net/ieee802154/6lowpan/core.c b/net/ieee802154/6lowpan/core.c
index 0ae5822ef944..2e77fada7e54 100644
--- a/net/ieee802154/6lowpan/core.c
+++ b/net/ieee802154/6lowpan/core.c
@@ -69,13 +69,6 @@ static __le16 lowpan_get_short_addr(const struct net_device *dev)
 	return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
 }
 
-static u8 lowpan_get_dsn(const struct net_device *dev)
-{
-	struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
-
-	return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
-}
-
 static struct header_ops lowpan_header_ops = {
 	.create	= lowpan_header_create,
 };
@@ -106,7 +99,6 @@ static const struct net_device_ops lowpan_netdev_ops = {
 static struct ieee802154_mlme_ops lowpan_mlme = {
 	.get_pan_id = lowpan_get_pan_id,
 	.get_short_addr = lowpan_get_short_addr,
-	.get_dsn = lowpan_get_dsn,
 };
 
 static void lowpan_setup(struct net_device *dev)
diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
index 127ba18386fc..56b3847466e9 100644
--- a/net/mac802154/ieee802154_i.h
+++ b/net/mac802154/ieee802154_i.h
@@ -141,7 +141,6 @@ __le16 mac802154_dev_get_short_addr(const struct net_device *dev);
 __le16 mac802154_dev_get_pan_id(const struct net_device *dev);
 void mac802154_dev_set_pan_id(struct net_device *dev, __le16 val);
 void mac802154_dev_set_page_channel(struct net_device *dev, u8 page, u8 chan);
-u8 mac802154_dev_get_dsn(const struct net_device *dev);
 
 int mac802154_get_params(struct net_device *dev,
 			 struct ieee802154_llsec_params *params);
diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c
index 22f478be7489..0ec7bc402e29 100644
--- a/net/mac802154/iface.c
+++ b/net/mac802154/iface.c
@@ -368,7 +368,7 @@ static int mac802154_header_create(struct sk_buff *skb,
 	hdr.fc.type = cb->type;
 	hdr.fc.security_enabled = cb->secen;
 	hdr.fc.ack_request = cb->ackreq;
-	hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
+	hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
 
 	if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
 		return -EINVAL;
@@ -468,13 +468,16 @@ ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata,
 		       enum nl802154_iftype type)
 {
 	struct wpan_dev *wpan_dev = &sdata->wpan_dev;
+	u8 tmp;
 
 	/* set some type-dependent values */
 	sdata->vif.type = type;
 	sdata->wpan_dev.iftype = type;
 
-	get_random_bytes(&wpan_dev->bsn, 1);
-	get_random_bytes(&wpan_dev->dsn, 1);
+	get_random_bytes(&tmp, sizeof(tmp));
+	atomic_set(&wpan_dev->bsn, tmp);
+	get_random_bytes(&tmp, sizeof(tmp));
+	atomic_set(&wpan_dev->dsn, tmp);
 
 	/* defaults per 802.15.4-2011 */
 	wpan_dev->min_be = 3;
diff --git a/net/mac802154/mac_cmd.c b/net/mac802154/mac_cmd.c
index 6dcbb3b5994c..3b347d4d3d4c 100644
--- a/net/mac802154/mac_cmd.c
+++ b/net/mac802154/mac_cmd.c
@@ -153,7 +153,6 @@ struct ieee802154_mlme_ops mac802154_mlme_wpan = {
 	.start_req = mac802154_mlme_start_req,
 	.get_pan_id = mac802154_dev_get_pan_id,
 	.get_short_addr = mac802154_dev_get_short_addr,
-	.get_dsn = mac802154_dev_get_dsn,
 
 	.llsec = &mac802154_llsec_ops,
 
diff --git a/net/mac802154/mib.c b/net/mac802154/mib.c
index 033dfc7755c6..00a62de9cc23 100644
--- a/net/mac802154/mib.c
+++ b/net/mac802154/mib.c
@@ -76,15 +76,6 @@ void mac802154_dev_set_pan_id(struct net_device *dev, __le16 val)
 	spin_unlock_bh(&sdata->mib_lock);
 }
 
-u8 mac802154_dev_get_dsn(const struct net_device *dev)
-{
-	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
-
-	BUG_ON(dev->type != ARPHRD_IEEE802154);
-
-	return sdata->wpan_dev.dsn++;
-}
-
 void mac802154_dev_set_page_channel(struct net_device *dev, u8 page, u8 chan)
 {
 	struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);