Re: [PATCH] COLO-compare: Fix incorrect `if` logic

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Hi Fan,

you forgot to Cc the maintainers (doing that for you):

./scripts/get_maintainer.pl -f net/colo-compare.c
Zhang Chen <chen.zhang@intel.com> (supporter:COLO Proxy)
Li Zhijian <lizhijian@cn.fujitsu.com> (supporter:COLO Proxy)
Jason Wang <jasowang@redhat.com> (maintainer:Network device ba...)
qemu-devel@nongnu.org (open list:All patches CC here)

On 9/24/19 4:08 PM, Fan Yang wrote:
> 'colo_mark_tcp_pkt' should return 'true' when packets are the same, and
> 'false' otherwise.  However, it returns 'true' when
> 'colo_compare_packet_payload' returns non-zero while
> 'colo_compare_packet_payload' is just a 'memcmp'.  The result is that
> COLO-compare reports inconsistent TCP packets when they are actually
> the same.
> 

Fixes: f449c9e549c
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> Signed-off-by: Fan Yang <Fan_Yang@sjtu.edu.cn>
> ---
>  net/colo-compare.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/net/colo-compare.c b/net/colo-compare.c
> index 7489840bde..7ee17f2cf8 100644
> --- a/net/colo-compare.c
> +++ b/net/colo-compare.c
> @@ -319,7 +319,7 @@ static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt,
>      *mark = 0;
>  
>      if (ppkt->tcp_seq == spkt->tcp_seq && ppkt->seq_end == spkt->seq_end) {
> -        if (colo_compare_packet_payload(ppkt, spkt,
> +        if (!colo_compare_packet_payload(ppkt, spkt,
>                                          ppkt->header_size, spkt->header_size,
>                                          ppkt->payload_size)) {
>              *mark = COLO_COMPARE_FREE_SECONDARY | COLO_COMPARE_FREE_PRIMARY;
> @@ -329,7 +329,7 @@ static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt,
>  
>      /* one part of secondary packet payload still need to be compared */
>      if (!after(ppkt->seq_end, spkt->seq_end)) {
> -        if (colo_compare_packet_payload(ppkt, spkt,
> +        if (!colo_compare_packet_payload(ppkt, spkt,
>                                          ppkt->header_size + ppkt->offset,
>                                          spkt->header_size + spkt->offset,
>                                          ppkt->payload_size - ppkt->offset)) {
> @@ -348,7 +348,7 @@ static bool colo_mark_tcp_pkt(Packet *ppkt, Packet *spkt,
>          /* primary packet is longer than secondary packet, compare
>           * the same part and mark the primary packet offset
>           */
> -        if (colo_compare_packet_payload(ppkt, spkt,
> +        if (!colo_compare_packet_payload(ppkt, spkt,
>                                          ppkt->header_size + ppkt->offset,
>                                          spkt->header_size + spkt->offset,
>                                          spkt->payload_size - spkt->offset)) {
>