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@xxxxxxxxx>
---
include/net/cfg802154.h | 4 ++--
net/mac802154/iface.c | 12 ++++++------
2 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
index c6aa1d2..4de59aa 100644
--- a/include/net/cfg802154.h
+++ b/include/net/cfg802154.h
@@ -177,9 +177,9 @@ struct wpan_dev {
__le64 extended_addr;
/* MAC BSN field */
- u8 bsn;
+ atomic_t bsn;
/* MAC DSN field */
- u8 dsn;
+ atomic_t dsn;
u8 min_be;
u8 max_be;
diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c
index 866d27f..f30788d 100644
--- a/net/mac802154/iface.c
+++ b/net/mac802154/iface.c
@@ -365,10 +365,7 @@ 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;
- /* TODO: use atomic_t as dsn, dsn need to be locked when AF_IEEE802154
- * and IEEE802154 6LoWPAN call this at the same time.
- */
- hdr.seq = dev->ieee802154_ptr->dsn++;
+ hdr.seq = atomic_inc_return(&dev->ieee802154_ptr->dsn) & 0xFF;
if (mac802154_set_header_security(sdata, &hdr, cb) < 0)
return -EINVAL;
@@ -464,13 +461,16 @@ 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;
--
2.4.1
--
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