[ovs-dev] [PATCH V4 09/24] datapath: simplify the flow_hash

[Greg Rose]

From: Tonghao Zhang <xiangxia.m.yue at gmail.com>

Upstream commit:
    commit 515b65a4b99197ae062a795ab4de919e6d04be04
    Author: Tonghao Zhang <xiangxia.m.yue at gmail.com>
    Date:   Fri Nov 1 22:23:50 2019 +0800

    net: openvswitch: simplify the flow_hash

    Simplify the code and remove the unnecessary BUILD_BUG_ON.

    Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
    Tested-by: Greg Rose <gvrose8192 at gmail.com>
    Acked-by: William Tu <u9012063 at gmail.com>
    Acked-by: Pravin B Shelar <pshelar at ovn.org>
    Signed-off-by: David S. Miller <davem at davemloft.net>

Cc: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Reviewed-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Signed-off-by: Greg Rose <gvrose8192 at gmail.com>
---
 datapath/flow_table.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/datapath/flow_table.c b/datapath/flow_table.c
index 62d726ddd..7efaa8044 100644
--- a/datapath/flow_table.c
+++ b/datapath/flow_table.c
@@ -455,13 +455,10 @@ err_free_ti:
 static u32 flow_hash(const struct sw_flow_key *key,
 		     const struct sw_flow_key_range *range)
 {
-	int key_start = range->start;
-	int key_end = range->end;
-	const u32 *hash_key = (const u32 *)((const u8 *)key + key_start);
-	int hash_u32s = (key_end - key_start) >> 2;
+	const u32 *hash_key = (const u32 *)((const u8 *)key + range->start);
 
 	/* Make sure number of hash bytes are multiple of u32. */
-	BUILD_BUG_ON(sizeof(long) % sizeof(u32));
+	int hash_u32s = range_n_bytes(range) >> 2;
 
 	return jhash2(hash_key, hash_u32s, 0);
 }
-- 
2.17.1