net/mlx5: IPSec, Fix 64-bit division on 32-bit builds

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>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.c
index 4a78aefdf157..7d06c673851a 100644
--- 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(void)
 {
         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(void)
          */
         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);
         }
 }