Acked-By: Miguel Angel Ajo <majop...@redhat.com>
$ cat test.c
#include <stdio.h>
#include <stdint.h>
void main(void) {
printf("uint16_t<<24=%Lx\n", ((uint16_t)0xf123)<<24);
printf("uint64_t<<24=%Lx\n", ((uint64_t)0xf123)<<24);
}
linux: vagrant@gw1 in ~/ovs on
$ ./test
uint16_t<<24=23000000
uint64_t<<24=f123000000
I tested it, and it seems (that at least for my gcc version 4.8.5 20150623
(Red Hat 4.8.5-11) (GCC) on x64),
a 16 bit shifted, will result in 32bit output.
a 64bit shifted will result in 64bit output.
That could explain why this could have been working and not seen with <256
ports.
On Sat, May 27, 2017 at 6:24 AM, Ben Pfaff <b...@ovn.org> wrote:
> put_encapsulation() is meant to load the logical output port into bits
> 24 to 40 of the tunnel ID metadata field, but 'outport << 24' did not
> have that effect because outport has type uint16_t. This fixes the
> problem.
>
> Found by Coverity.
>
> Reported-at: https://scan3.coverity.com/reports.htm#v16889/p10449/
> fileInstanceId=14763078&defectInstanceId=4304791&mergedDefectId=180391
> Signed-off-by: Ben Pfaff <b...@ovn.org>
> ---
> ovn/controller/physical.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/ovn/controller/physical.c b/ovn/controller/physical.c
> index 457fc45414bd..532c7252e1ea 100644
> --- a/ovn/controller/physical.c
> +++ b/ovn/controller/physical.c
> @@ -128,8 +128,8 @@ put_encapsulation(enum mf_field_id mff_ovn_geneve,
> put_load(outport, mff_ovn_geneve, 0, 32, ofpacts);
> put_move(MFF_LOG_INPORT, 0, mff_ovn_geneve, 16, 15, ofpacts);
> } else if (tun->type == STT) {
> - put_load(datapath->tunnel_key | (outport << 24), MFF_TUN_ID, 0,
> 64,
> - ofpacts);
> + put_load(datapath->tunnel_key | ((uint64_t) outport << 24),
> + MFF_TUN_ID, 0, 64, ofpacts);
> put_move(MFF_LOG_INPORT, 0, MFF_TUN_ID, 40, 15, ofpacts);
> } else if (tun->type == VXLAN) {
> put_load(datapath->tunnel_key, MFF_TUN_ID, 0, 24, ofpacts);
> --
> 2.10.2
>
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>
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