Re: [dpdk-dev] [RFC] app/testpmd: add generic swap forwarding engine

[Xiaoyu Min <jackmin@mellanox.com>]

On Tue, 20-04-21, 15:47, Iremonger, Bernard wrote:
> Hi Xiaoyu,
Hey Bernard,

> 
> > -----Original Message-----
> > From: Xiaoyu Min <jackmin@mellanox.com>
> > Sent: Wednesday, April 15, 2020 2:49 PM
> > To: thomas@monjalon.net; asafp@mellanox.com; Lu, Wenzhuo
> > <wenzhuo.lu@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>; Iremonger,
> > Bernard <bernard.iremonger@intel.com>; Mcnamara, John
> > <john.mcnamara@intel.com>; Kovacevic, Marko
> > <marko.kovacevic@intel.com>
> > Cc: dev@dpdk.org
> > Subject: [RFC] app/testpmd: add generic swap forwarding engine
> > 
> > This RFC propose a generic `swap` forwarding engine, which could be seen as
> > an extension of existing `macswap` but provide more flexibility.
> > 
> > With this generic `swap` forwarding engine, we can `swap` the source and
> > destination of L2/L3 address as well as the source and destination port of L4
> > according to the user inputs.
> > 
> > This will be very helpful for developer/tester in some test scenarios.
> > For example, connection tracking functinality in OVS, which needs to swap
> > UDP ports in addition to L2/L3 addresses in order to complete one
> > connection.
> > 
> > Signed-off-by: Xiaoyu Min <jackmin@mellanox.com>
> > ---
> >  app/test-pmd/parameters.c                   |  2 ++
> >  doc/guides/testpmd_app_ug/testpmd_funcs.rst | 15 ++++++++++++++-
> >  2 files changed, 16 insertions(+), 1 deletion(-)
> > 
> > diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c index
> > 404dba2b20..5c9aecd6cb 100644
> > --- a/app/test-pmd/parameters.c
> > +++ b/app/test-pmd/parameters.c
> > @@ -147,6 +147,8 @@ usage(char* progname)
> >  	       "is default).\n");
> >  	printf("  --forward-mode=N: set forwarding mode (N: %s).\n",
> >  	       list_pkt_forwarding_modes());
> > +	printf("  --forward-mode=swap[:TYPE[,TYPE]]: set forwarding mode
> > to swap "
> > +	       "(TYPE: auto (default) or mac or ip or tp).\n");
> >  	printf("  --rss-ip: set RSS functions to IPv4/IPv6 only .\n");
> >  	printf("  --rss-udp: set RSS functions to IPv4/IPv6 + UDP.\n");
> >  	printf("  --rxq=N: set the number of RX queues per port to N.\n");
> > diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> > b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> > index dcee5de455..27f0600493 100644
> > --- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> > +++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
> > @@ -298,7 +298,7 @@ set fwd
> >  Set the packet forwarding mode::
> > 
> >     testpmd> set fwd (io|mac|macswap|flowgen| \
> > -                     rxonly|txonly|csum|icmpecho|noisy) (""|retry)
> > +                     rxonly|txonly|csum|icmpecho|noisy|swap) (""|retry)
> > 
> >  ``retry`` can be specified for forwarding engines except ``rx_only``.
> > 
> > @@ -336,6 +336,19 @@ The available information categories are:
> >    Simulate more realistic behavior of a guest machine engaged in receiving
> >    and sending packets performing Virtual Network Function (VNF).
> > 
> > +* ``swap[:TYPE[,TYPE]*]``: Generic swap forwarding mode.
> > +
> > +  Swap the source and destination address or/and source and destination
> > port of packet according to ``TYPE`` before forwarding them.
> > +  ``TYPE`` could be:
> > +
> > +  - ``auto``: swaps all supported fields (L2 to L4) if available, default.
> > +
> > +  - ``mac``: swaps the source address and destination address of Ethernet, as
> > same as ``macswap``.
> > +
> > +  - ``ip``: swaps the source address and destination address of IP (v4 and v6).
> > +
> > +  - ``tp``: swaps the source port and destination port of transport layer (TCP
> > and UDP).
> > +
> >  Example::
> > 
> >     testpmd> set fwd rxonly
> > --
> > 2.26.0
> 
> This patch is giving the following checkpatch errors:
Sorry, I missed them. I'll fix this in PATCH.

> 
> root@silpixa00399470:~/dpdk-next-net# /root/dpdk-next-net/devtools/checkpatches.sh /home/bairemon/patches_20_05_patchwork/RFC-app-testpmd-add-generic-swap-forwarding-engine
> .patch
> 
> ### [dpdk-dev] [RFC] app/testpmd: add generic swap forwarding engine
> 
> ERROR:TRAILING_WHITESPACE: trailing whitespace
> #97: FILE: doc/guides/testpmd_app_ug/testpmd_funcs.rst:340:
> + $
> 
> ERROR:TRAILING_WHITESPACE: trailing whitespace
> #102: FILE: doc/guides/testpmd_app_ug/testpmd_funcs.rst:345:
> + $
> 
> ERROR:TRAILING_WHITESPACE: trailing whitespace
> #104: FILE: doc/guides/testpmd_app_ug/testpmd_funcs.rst:347:
> + $
> 
> ERROR:TRAILING_WHITESPACE: trailing whitespace
> #106: FILE: doc/guides/testpmd_app_ug/testpmd_funcs.rst:349:
> + $
> 
> total: 4 errors, 0 warnings, 35 lines checked
> 
> 
> This seems to be just a documentation patch.
> I don't see any code to implement the new forwarding feature.
Yes, it's RFC so I just update the related documentation to describe the idea.
The complete code implementation will be a comming PATCH if community is OK
with this RFC.

> 
> Regards,
> 
> Bernard.
> 
>