Re: [dpdk-dev] [PATCH] net/mlx5: fix incorrect L3 layer chosen in TTL action

[Suanming Mou <suanmingm@mellanox.com>]

> -----Original Message-----
> From: Matan Azrad <matan@mellanox.com>
> Sent: Thursday, November 21, 2019 3:40 PM
> To: Suanming Mou <suanmingm@mellanox.com>; Slava Ovsiienko
> <viacheslavo@mellanox.com>
> Cc: dev@dpdk.org; stable@dpdk.org; Dekel Peled <dekelp@mellanox.com>
> Subject: RE: [PATCH] net/mlx5: fix incorrect L3 layer chosen in TTL action
> 
> 
> Hi Mou
> 
> From: Suanming Mou
> > For IPINIP flow, there are two L3 layer match pattern items, the inner
> > layer follows the outer layer as the latter L3 layer item, the TTL
> > action handles the outer layer.
> >
> > Current the outer and inner L3 layers are both regared as the outer L3
> > layer, it caueses TTL action uses the incorrect latter inner protocal
> > in
> > flow_dv_convert_action_modify_ttl() for header modifier.
> >
> > Check former L3 outer layer existence avoid set the incorrect inner
> > layer to the flow attr.
> >
> > Fixes: 4bb14c83df95 ("net/mlx5: support modify header using Direct
> > Verbs")
> > Cc: dekelp@mellanox.com
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
> > ---
> >  drivers/net/mlx5/mlx5_flow_dv.c | 12 ++++++++++--
> >  1 file changed, 10 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> > b/drivers/net/mlx5/mlx5_flow_dv.c index c402a8d..7cef5d3 100644
> > --- a/drivers/net/mlx5/mlx5_flow_dv.c
> > +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> > @@ -84,10 +84,18 @@
> >  	for (; item->type != RTE_FLOW_ITEM_TYPE_END; item++) {
> >  		switch (item->type) {
> >  		case RTE_FLOW_ITEM_TYPE_IPV4:
> > -			attr->ipv4 = 1;
> > +			/*
> > +			 * flow_dv_validate() avoids multiple L3 layers case
> > +			 * other than IPINIP. If attr->ipv6 set, ipv4 should
> > +			 * be the IPINIP inner layer.
> > +			 */
> > +			if (!attr->ipv6)
> > +				attr->ipv4 = 1;
> >  			break;
> >  		case RTE_FLOW_ITEM_TYPE_IPV6:
> > -			attr->ipv6 = 1;
> > +			/* If ipv4 set, ipv6 is the IPINIP inner layer. */
> > +			if (!attr->ipv4)
> > +				attr->ipv6 = 1;
> >  			break;
> >  		case RTE_FLOW_ITEM_TYPE_UDP:
> >  			attr->udp = 1;
> 
> What are about udp\tcp?
> 
> They both can be in outer and inner.....

Good catch. Per the command below, the udp tcp should also need to be taken care in vxlan mode.
flow create 0 group 2 ingress pattern ipv4 src is 192.168.1.1 /  udp src is 250 / vxlan vni is 125 / ipv4 src is 192.168.1.2 /  tcp src is 135 / end actions set_tp_src port 125 / jump group 3 / end

Maybe we need a new patch named "net/mlx5: fix incorrect L3/L4 layer chosen in tunnel mode".

>