tun: not use hardcoded mask value
0x3ff in tun_hashfn is mask of TUN_NUM_FLOW_ENTRIES, instead
of hardcode, define a macro to setup the relationship with
TUN_NUM_FLOW_ENTRIES
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 0a31347..2bbefe8 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -200,6 +200,7 @@ struct tun_flow_entry {
};
#define TUN_NUM_FLOW_ENTRIES 1024
+#define TUN_MASK_FLOW_ENTRIES (TUN_NUM_FLOW_ENTRIES - 1)
struct tun_prog {
struct rcu_head rcu;
@@ -406,7 +407,7 @@ static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val)
static inline u32 tun_hashfn(u32 rxhash)
{
- return rxhash & 0x3ff;
+ return rxhash & TUN_MASK_FLOW_ENTRIES;
}
static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash)