Re: [dpdk-dev] [PATCH] net/mlx5: fix order of lines in loop

[Slava Ovsiienko <viacheslavo@mellanox.com>]

> -----Original Message-----
> From: Dekel Peled <dekelp@mellanox.com>
> Sent: Monday, August 5, 2019 14:51
> To: Yongseok Koh <yskoh@mellanox.com>; Slava Ovsiienko
> <viacheslavo@mellanox.com>; Shahaf Shuler <shahafs@mellanox.com>
> Cc: Ori Kam <orika@mellanox.com>; dev@dpdk.org; Eli Britstein
> <elibr@mellanox.com>
> Subject: [PATCH] net/mlx5: fix order of lines in loop
> 
> Function flow_dv_zero_encap_udp_csum() uses a while loop to iterate over
> vlan items in flow rule.
> Pointer next_hdr is incremented to the next item before it is used, so the first
> item is skipped.
> 
> This patch moves the incrementing of next_hdr to the correct place.
> 
> Fixes: bf1d7d9a033a ("net/mlx5: zero out UDP checksum in encapsulation")
> Cc: elibr@mellanox.com
> 
> Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>

> ---
>  drivers/net/mlx5/mlx5_flow_dv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> b/drivers/net/mlx5/mlx5_flow_dv.c index 536059d..6c58634 100644
> --- a/drivers/net/mlx5/mlx5_flow_dv.c
> +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> @@ -1504,9 +1504,9 @@ struct field_modify_info modify_tcp[] = {
> 
>  	/* VLAN skipping */
>  	while (proto == RTE_ETHER_TYPE_VLAN || proto ==
> RTE_ETHER_TYPE_QINQ) {
> -		next_hdr += sizeof(struct rte_vlan_hdr);
>  		vlan = (struct rte_vlan_hdr *)next_hdr;
>  		proto = RTE_BE16(vlan->eth_proto);
> +		next_hdr += sizeof(struct rte_vlan_hdr);
>  	}
> 
>  	/* HW calculates IPv4 csum. no need to proceed */
> --
> 1.8.3.1