6lowpan: store fragment tag values per device instead of net stack wide

Signed-off-by: Tony Cheneau <tony.cheneau@amnesiak.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 61eee9d0dd21..f9524513847a 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -104,6 +104,7 @@ static const u8 lowpan_llprefix[] = {0xfe, 0x80};
 struct lowpan_dev_info {
         struct net_device       *real_dev; /* real WPAN device ptr */
         struct mutex            dev_list_mtx; /* mutex for list ops */
+        unsigned short fragment_tag;
 };
 
 struct lowpan_dev_record {
@@ -120,7 +121,6 @@ struct lowpan_fragment {
         struct list_head        list;           /* fragments list */
 };
 
-static unsigned short fragment_tag;
 static LIST_HEAD(lowpan_fragments);
 static DEFINE_SPINLOCK(flist_lock);
 
@@ -1027,14 +1027,14 @@ lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
 }
 
 static int
-lowpan_skb_fragmentation(struct sk_buff *skb)
+lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev)
 {
         int  err, header_length, payload_length, tag, offset = 0;
         u8 head[5];
 
         header_length = lowpan_get_mac_header_length(skb);
         payload_length = skb->len - header_length;
-        tag = fragment_tag++;
+        tag = lowpan_dev_info(dev)->fragment_tag++;
 
         /* first fragment header */
         head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7);
@@ -1099,7 +1099,7 @@ static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
         }
 
         pr_debug("frame is too big, fragmentation is needed\n");
-        err = lowpan_skb_fragmentation(skb);
+        err = lowpan_skb_fragmentation(skb, dev);
 error:
         dev_kfree_skb(skb);
 out:
@@ -1243,6 +1243,7 @@ static int lowpan_newlink(struct net *src_net, struct net_device *dev,
                 return -ENODEV;
 
         lowpan_dev_info(dev)->real_dev = real_dev;
+        lowpan_dev_info(dev)->fragment_tag = 0;
         mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
 
         entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);