Re: [dpdk-dev] [RFC 2/2] app/testpmd: support VXLAN last 8-bits field matching

[Rongwei Liu <rongweil@nvidia.com>]

Hi Singh:
	This update only provides the capability to match the last 8-bits reserved field of VXLAN header.
	No package modification totally. Package content is up to end user' decision.
BR
Rongwei

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Singh, Aman Deep
> Sent: Wednesday, June 16, 2021 1:16 AM
> To: dev@dpdk.org
> Subject: Re: [dpdk-dev] [RFC 2/2] app/testpmd: support VXLAN last 8-bits
> field matching
> 
> External email: Use caution opening links or attachments
> 
> 
> Hi Rongwei,
> 
> As per VxLAN RFC 7348- <https://datatracker.ietf.org/doc/html/rfc7348>
> 
> Reserved fields (24 bits and 8 bits): MUST be set to zero on transmission and
> ignored on receipt.
> 
> I hope this criteria will be met for external packets.
> 
> On 5/31/2021 3:49 PM, rongwei liu wrote:
> > Add a new testpmd pattern field 'last_rsvd' that supports the last
> > 8-bits matching of VXLAN header.
> >
> > The examples for the "last_rsvd" pattern field are as below:
> >
> > 1. ...pattern eth / ipv4 / udp / vxlan last_rsvd is 0x80 / end ...
> >
> > This flow will exactly match the last 8-bits to be 0x80.
> >
> > 2. ...pattern eth / ipv4 / udp / vxlan last_rsvd spec 0x80 vxlan mask
> > 0x80 / end ...
> Shouldn't this be as below, (or I am mistaken)-
> 
> 2. ...pattern eth / ipv4 / udp / vxlan last_rsvd spec 0x80 last_rsvd mask 0x80 /
> end ...
> 
> > This flow will only match the MSB of the last 8-bits to be 1.
> >
> > Signed-off-by: rongwei liu <rongweil@nvidia.com>
> > ---
> >   app/test-pmd/cmdline_flow.c                 | 9 +++++++++
> >   app/test-pmd/util.c                         | 5 +++--
> >   doc/guides/testpmd_app_ug/testpmd_funcs.rst | 1 +
> >   3 files changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
> > index 1c587bb7b8..6e76a625ca 100644
> > --- a/app/test-pmd/cmdline_flow.c
> > +++ b/app/test-pmd/cmdline_flow.c
> > @@ -207,6 +207,7 @@ enum index {
> >       ITEM_SCTP_CKSUM,
> >       ITEM_VXLAN,
> >       ITEM_VXLAN_VNI,
> > +     ITEM_VXLAN_LAST_RSVD,
> >       ITEM_E_TAG,
> >       ITEM_E_TAG_GRP_ECID_B,
> >       ITEM_NVGRE,
> > @@ -1129,6 +1130,7 @@ static const enum index item_sctp[] = {
> >
> >   static const enum index item_vxlan[] = {
> >       ITEM_VXLAN_VNI,
> > +     ITEM_VXLAN_LAST_RSVD,
> >       ITEM_NEXT,
> >       ZERO,
> >   };
> > @@ -2806,6 +2808,13 @@ static const struct token token_list[] = {
> >               .next = NEXT(item_vxlan, NEXT_ENTRY(UNSIGNED), item_param),
> >               .args = ARGS(ARGS_ENTRY_HTON(struct rte_flow_item_vxlan, vni)),
> >       },
> > +     [ITEM_VXLAN_LAST_RSVD] = {
> > +             .name = "last_rsvd",
> > +             .help = "VXLAN last reserved bits",
> > +             .next = NEXT(item_vxlan, NEXT_ENTRY(UNSIGNED), item_param),
> > +             .args = ARGS(ARGS_ENTRY_HTON(struct rte_flow_item_vxlan,
> > +                                          rsvd1)),
> > +     },
> >       [ITEM_E_TAG] = {
> >               .name = "e_tag",
> >               .help = "match E-Tag header", diff --git
> > a/app/test-pmd/util.c b/app/test-pmd/util.c index
> > a9e431a8b2..59626518d5 100644
> > --- a/app/test-pmd/util.c
> > +++ b/app/test-pmd/util.c
> > @@ -266,8 +266,9 @@ dump_pkt_burst(uint16_t port_id, uint16_t queue,
> struct rte_mbuf *pkts[],
> >                               vx_vni = rte_be_to_cpu_32(vxlan_hdr->vx_vni);
> >                               MKDUMPSTR(print_buf, buf_size, cur_len,
> >                                         " - VXLAN packet: packet type =%d, "
> > -                                       "Destination UDP port =%d, VNI = %d",
> > -                                       packet_type, udp_port, vx_vni >> 8);
> > +                                       "Destination UDP port =%d, VNI = %d, "
> > +                                       "last_rsvd = %d", packet_type,
> > +                                       udp_port, vx_vni >> 8, vx_vni
> > + & 0xff);
> >                       }
> >               }
> >               MKDUMPSTR(print_buf, buf_size, cur_len, diff --git
> > a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> > b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> > index 33857acf54..4ca3103067 100644
> > --- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> > +++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> > @@ -3694,6 +3694,7 @@ This section lists supported pattern items and
> their attributes, if any.
> >   - ``vxlan``: match VXLAN header.
> >
> >     - ``vni {unsigned}``: VXLAN identifier.
> > +  - ``last_rsvd {unsigned}``: VXLAN last reserved 8-bits.
> >
> >   - ``e_tag``: match IEEE 802.1BR E-Tag header.
> >