Re: [dpdk-dev] [RFC PATCH 00/13] add eventmode to ipsec-secgw

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> This series introduces event-mode additions to ipsec-secgw. This effort
> is based on the proposed changes for l2fwd-event and the additions in
> l3fwd for event support.
> 
> With this series, ipsec-secgw would be able to run in eventmode. The
> worker thread (executing loop) would be receiving events and would be
> submitting it back to the eventdev after the processing. This way,
> multicore scaling and h/w assisted scheduling is achieved by making use
> of the eventdev capabilities.
> 
> Since the underlying event device would be having varying capabilities,
> the worker thread could be drafted differently to maximize performance.
> This series introduces usage of multiple worker threads, among which the
> one to be used will be determined by the operating conditions and the
> underlying device capabilities.
> 
> For example, if an event device - eth device pair has Tx internal port,
> then application can do tx_adapter_enqueue() instead of regular
> event_enqueue(). So a thread making an assumption that the device pair
> has internal port will not be the right solution for another pair. The
> infrastructure added with these patches aims to help application to have
> multiple worker threads, there by extracting maximum performance from
> every device without affecting existing paths/use cases.
> 
> The eventmode configuration is predefined. All packets reaching one eth
> port will hit one event queue. All event queues will be mapped to all
> event ports. So all cores will be able to receive traffic from all ports.
> When schedule_type is set as RTE_SCHED_TYPE_ORDERED/ATOMIC, event device
> will ensure the ordering. Ordering would be lost when tried in PARALLEL.
> 
> Following command line options are introduced,
> 
> --transfer-mode: to choose between poll mode & event mode
> --schedule-type: to specify the scheduling type
>                  (RTE_SCHED_TYPE_ORDERED/
>                   RTE_SCHED_TYPE_ATOMIC/
>                   RTE_SCHED_TYPE_PARALLEL)
> --process-dir: outbound/inbound
> --process-mode: app mode /driver mode
> 
> The two s/w config options added to ipsec-secgw can be used in
> benchmarking h/w performance,
> 

I didn't look at the actual code (yet), just cover letter,
few quick questions below. 

> 1. process-dir : states whether the direction is outbound/inbound.
> This option aims to avoid an unnecessary check of determining whether
> inbound/outbound processing need to be done on the packet. For each
> option a different light weight worker thread would be executed.

Bur right now app can do both inbound and outbound simultaneously on the same core.
I presume the default behavior will be preserved?

> 
> 2. process-mode: states whether the application has to run in driver
>                  mode or app mode.
> 
> Driver-mode: This mode will have bare minimum changes in the application
>              to support ipsec. There woudn't be any lookup etc done in
>              the application. And for inline-protocol use case, the
>              thread would resemble l2fwd as the ipsec processing would be
>              done entirely in the h/w. This mode can be used to benchmark
>              the raw performance of the h/w. All the application side
>              steps (like lookup) can be redone based on the requirement
>              of the end user. Hence the need for a mode which would
>              report the raw performance.
> 
> App-mode: This mode will have all the features currently implemented with
>           ipsec-secgw (non librte_ipsec mode). All the lookups etc
>           would follow the existing methods and would report numbers
>           that can be compared against regular ipsec-secgw benchmark
>           numbers.
> 
> Example commands to execute ipsec-secgw in various modes on OCTEONTX2 platform,
> 
> #Inbound driver mode
> ./ipsec-secgw -w 0002:02:00.0,nb_ipsec_in_sa=128 -w 0002:03:00.0,nb_ipsec_in_sa=128 -w 0002:04:00.0,nb_ipsec_in_sa=128 -w
> 0002:07:00.0,nb_ipsec_in_sa=128 -w 0002:0e:00.0 -w 0002:10:00.1 --log-level=8 -c 0x7 – -P -p 0xf --config "(0,0,0),(1,0,0),(2,0,0),(3,0,0)" -f
> dpdk_internal/100g_4.3.cfg --transfer-mode 1 --schedule-type 2 --process-mode 1 --process-dir 1

For all these parameters, I think better to use names (app/driver, etc.) instead of raw numbers.

> 
> #Inbound app mode
> ./ipsec-secgw -w 0002:02:00.0,nb_ipsec_in_sa=128 -w 0002:03:00.0,nb_ipsec_in_sa=128 -w 0002:04:00.0,nb_ipsec_in_sa=128 -w
> 0002:07:00.0,nb_ipsec_in_sa=128 -w 0002:0e:00.0 -w 0002:10:00.1 --log-level=8 -c 0x3f – -P -p 0xf --config "(0,0,0),(1,0,0),(2,0,0),(3,0,0)" -
> f dpdk_internal/100g_4.3.cfg --transfer-mode 1 --schedule-type 2 --process-mode 0 --process-dir 1
> 
> #Outbound driver mode
> ./ipsec-secgw -w 0002:02:00.0 -w 0002:03:00.0 -w 0002:04:00.0 -w 0002:07:00.0 -w 0002:0e:00.0 -w 0002:10:00.1 --log-level=8 -c 0x1f – -
> P -p 0xf --config "(0,0,0),(1,0,0),(2,0,0),(3,0,0)" -f a-aes-gcm-new.cfg --transfer-mode 1 --schedule-type 2 --process-mode 1 --process-dir 0
> 
> #Outbound app mode
> ./ipsec-secgw -w 0002:02:00.0 -w 0002:03:00.0 -w 0002:04:00.0 -w 0002:07:00.0 -w 0002:0e:00.0 -w 0002:10:00.1 --log-level=8 -c 0x7f – -
> P -p 0xf --config "(0,0,0),(1,0,0),(2,0,0),(3,0,0)" -f a-aes-gcm-new.cfg --transfer-mode 1 --schedule-type 2 --process-mode 0 --process-dir 0
> 
> This series is targeted for next release (20.02). This series doesn't introduce
> any library change. 

By 'library change' you mean that this new event-mode will be supported
only by legacy code-path or ...?

>And the decision to add eventmode additions in ipsec-secgw
> was approved by the Tech Board.
> 
> Following are missing in the RFC. Will add it when sending patches.
> 1. Documentation.
> 2. More cleanup is needed. There are options that are added so that future
>    expansion is not hindered. Need inputs from the community if there is use
>    case for them.
> 
> Following are planned features,
> 1. Add burst mode workers.
> 2. Add non tx internal port worker.
> 3. Verify support for Rx core (the support is added but lack of h/w to verify).
> 4. Add lookaside protocol support.
> 
> Following are features that Marvell won't be attempting.
> 1. Inline crypto support.
> 2. Lookaside crypto support.

Ok so what mode is supported right now with this RFC?

> 
> For the features that Marvell won't be attempting, new workers can be
> introduced by the respective stake holders.
> 
> Anoob Joseph (13):
>   examples/ipsec-secgw: add framework for eventmode helper
>   examples/ipsec-secgw: add eventdev port-lcore link
>   examples/ipsec-secgw: add Rx adapter support
>   examples/ipsec-secgw: add Tx adapter support
>   examples/ipsec-secgw: add routines to display config
>   examples/ipsec-secgw: add routines to launch workers
>   examples/ipsec-secgw: add support for internal ports
>   examples/ipsec-secgw: add eventmode to ipsec-secgw
>   examples/ipsec-secgw: add app inbound worker
>   examples/ipsec-secgw: add app processing code
>   examples/ipsec-secgw: add driver outbound worker
>   examples/ipsec-secgw: add app outbound worker
>   examples/ipsec-secgw: add cmd line option for bufs
> 
>  examples/ipsec-secgw/Makefile       |    2 +
>  examples/ipsec-secgw/event_helper.c | 1757 +++++++++++++++++++++++++++++++++++
>  examples/ipsec-secgw/event_helper.h |  334 +++++++
>  examples/ipsec-secgw/ipsec-secgw.c  |  436 +++++++--
>  examples/ipsec-secgw/ipsec-secgw.h  |   81 ++
>  examples/ipsec-secgw/ipsec.c        |    4 +
>  examples/ipsec-secgw/ipsec.h        |   30 +-
>  examples/ipsec-secgw/ipsec_worker.c |  766 +++++++++++++++
>  examples/ipsec-secgw/ipsec_worker.h |   39 +
>  examples/ipsec-secgw/meson.build    |    4 +-
>  examples/ipsec-secgw/sa.c           |   11 -
>  11 files changed, 3360 insertions(+), 104 deletions(-)
>  create mode 100644 examples/ipsec-secgw/event_helper.c
>  create mode 100644 examples/ipsec-secgw/event_helper.h
>  create mode 100644 examples/ipsec-secgw/ipsec-secgw.h
>  create mode 100644 examples/ipsec-secgw/ipsec_worker.c
>  create mode 100644 examples/ipsec-secgw/ipsec_worker.h
> 
> --
> 2.7.4