[dpdk-stable] [PATCH] ethdev: fix VXLAN mask initialization value

[Ferruh Yigit]

On 4/8/2021 7:48 AM, Gregory Etelson wrote:
> In GCC compiler, __builtin_constant_p(exp) is a function.
> The function returns the integer 1 if the argument is known to be
> a compile-time constant.
> Therefore, __builtin_constant_p(0xffffff << 8) returned 1.
> As the result, rte_flow_item_vxlan_mask was initiated to
> {{
>    {flags = 0x0, rsvd0 = {0x0, 0x0, 0x0},
>     vni = {0x0, 0x0, 0x0}, rsvd1 = 0x1},
>    hdr = {vx_flags = 0x0, vx_vni = 0x1000000}}}
> }}
> GCC fails initialization
> rte_flow_item_vxlan_mask.hdr.vni = (0xffffff << 8)
> with "initializer element is not a constant expression" error.
> Use immediate 0xffffff00 value instead.
> 
> Cc: stable at dpdk.org
> Fixes: 43af98e687cf ("ethdev: reuse VXLAN header definition in flow item")
> 
> Signed-off-by: Gregory Etelson <getelson at nvidia.com>
> Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>

Reviewed-by: Ferruh Yigit <ferruh.yigit at intel.com>