From: Ilan Tayari <ilant@mellanox.com>
Date: Sun, 2 Jul 2017 10:57:56 +0300
Subject: net/mlx5: IPSec, Fix 64-bit division on 32-bit builds
Patch-mainline: v4.13-rc1
Git-commit: 5dfd87b67cd98375896890e01437edefeb45a707
References: bsc#1046303 FATE#322944
Fix warnings when building 386 kernel:
>> ERROR: "__udivdi3" [drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko] undefined!
Fixes: 2ac9cfe78223 ("net/mlx5e: IPSec, Add Innova IPSec offload TX data path")
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.c
@@ -363,6 +363,7 @@ void mlx5e_ipsec_build_inverse_table(voi
{
u16 mss_inv;
u32 mss;
+ u64 n;
/* Calculate 1/x inverse table for use in GSO data path.
* Using this table, we provide the IPSec accelerator with the value of
@@ -372,7 +373,8 @@ void mlx5e_ipsec_build_inverse_table(voi
*/
mlx5e_ipsec_inverse_table[1] = htons(0xFFFF);
for (mss = 2; mss < MAX_LSO_MSS; mss++) {
- mss_inv = ((1ULL << 32) / mss) >> 16;
+ n = 1ULL << 32;
+ mss_inv = do_div(n, mss) >> 16;
mlx5e_ipsec_inverse_table[mss] = htons(mss_inv);
}
}