Re: [dpdk-dev] [PATCH 1/2] eventdev: implement ABI change

[Sunil Kumar Kori <skori@marvell.com>]

>-----Original Message-----
>From: dev <dev-bounces@dpdk.org> On Behalf Of Timothy McDaniel
>Sent: Friday, September 11, 2020 10:28 PM
>Cc: Jerin Jacob Kollanukkaran <jerinj@marvell.com>;
>mattias.ronnblom@ericsson.com; liang.j.ma@intel.com;
>peter.mccarthy@intel.com; nipun.gupta@nxp.com; Pavan Nikhilesh
>Bhagavatula <pbhagavatula@marvell.com>; dev@dpdk.org;
>erik.g.carrillo@intel.com; gage.eads@intel.com; harry.van.haaren@intel.com;
>hemant.agrawal@nxp.com; bruce.richardson@intel.com
>Subject: [dpdk-dev] [PATCH 1/2] eventdev: implement ABI change
>
>This commit implements the eventdev ABI changes required by the DLB PMD.
>
>The DLB hardware does not conform exactly to the eventdev interface.
>1) It has a limit on the number of queues that may be linked to a port.
>2) Some ports are further restricted to a maximum of 1 linked queue.
>3) It does not (currently) have the ability to carry the flow_id as part of the
>event (QE) payload.
>
>Due to the above, we would like to propose the following enhancements.
>
>1) Add new fields to the rte_event_dev_info struct. These fields allow the
>device to advertise its capabilities so that applications can take the
>appropriate actions based on those capabilities.
>
>2) Add a new field to the rte_event_dev_config struct. This field allows the
>application to specify how many of its ports are limited to a single link, or will
>be used in single link mode.
>
>3) Replace the dedicated implicit_release_disabled field with a bit field of
>explicit port capabilities. The implicit_release_disable functionality is assigned
>to one bit, and a port-is-single-link-only attribute is assigned to another, with
>the remaining bits available for future assignment.
>
>Signed-off-by: Timothy McDaniel <timothy.mcdaniel@intel.com>
>---
> drivers/event/dpaa/dpaa_eventdev.c             |  3 +-
> drivers/event/dpaa2/dpaa2_eventdev.c           |  5 +-
> drivers/event/dsw/dsw_evdev.c                  |  3 +-
> drivers/event/octeontx/ssovf_evdev.c           |  5 +-
> drivers/event/octeontx2/otx2_evdev.c           |  3 +-
> drivers/event/opdl/opdl_evdev.c                |  3 +-
> drivers/event/skeleton/skeleton_eventdev.c     |  5 +-
> drivers/event/sw/sw_evdev.c                    |  8 ++--
> drivers/event/sw/sw_evdev_selftest.c           |  6 +--
> lib/librte_eventdev/rte_event_eth_tx_adapter.c |  2 +-
> lib/librte_eventdev/rte_eventdev.c             | 66 +++++++++++++++++++++++---
> lib/librte_eventdev/rte_eventdev.h             | 51 ++++++++++++++++----
> lib/librte_eventdev/rte_eventdev_pmd_pci.h     |  1 -
> lib/librte_eventdev/rte_eventdev_trace.h       |  7 +--
> lib/librte_eventdev/rte_eventdev_version.map   |  4 +-
> 15 files changed, 134 insertions(+), 38 deletions(-)
>
> /**
>  * @internal
>  * Wrapper for use by pci drivers as a .remove function to detach a event diff
>--git a/lib/librte_eventdev/rte_eventdev_trace.h
>b/lib/librte_eventdev/rte_eventdev_trace.h
>index 4de6341..5ec43d8 100644
>--- a/lib/librte_eventdev/rte_eventdev_trace.h
>+++ b/lib/librte_eventdev/rte_eventdev_trace.h
>@@ -34,6 +34,7 @@ RTE_TRACE_POINT(
> 	rte_trace_point_emit_u32(dev_conf-
>>nb_event_port_dequeue_depth);
> 	rte_trace_point_emit_u32(dev_conf-
>>nb_event_port_enqueue_depth);
> 	rte_trace_point_emit_u32(dev_conf->event_dev_cfg);
>+	rte_trace_point_emit_u8(dev_conf-
>>nb_single_link_event_port_queues);
> 	rte_trace_point_emit_int(rc);
> )
>
I tried running testpmd with trace support with this patch and got following error:

EAL: __rte_trace_point_emit_field():442 CTF field is too long
EAL: __rte_trace_point_register():468 missing rte_trace_emit_header() in register fn

It is because of memory (384 bytes) for CTF gets exhausted during eventdev_configure. 
Did you also observe the same issue ? If yes, Then please send a separate patch to increase
Maximum buffer size TRACE_CTF_FIELD_SIZE. Recommended size is 448 bytes.

>@@ -59,7 +60,7 @@ RTE_TRACE_POINT(
> 	rte_trace_point_emit_i32(port_conf->new_event_threshold);
> 	rte_trace_point_emit_u16(port_conf->dequeue_depth);
> 	rte_trace_point_emit_u16(port_conf->enqueue_depth);
>-	rte_trace_point_emit_u8(port_conf->disable_implicit_release);
>+	rte_trace_point_emit_u32(port_conf->event_port_cfg);
> 	rte_trace_point_emit_int(rc);
> )
>
>@@ -165,7 +166,7 @@ RTE_TRACE_POINT(
> 	rte_trace_point_emit_i32(port_conf->new_event_threshold);
> 	rte_trace_point_emit_u16(port_conf->dequeue_depth);
> 	rte_trace_point_emit_u16(port_conf->enqueue_depth);
>-	rte_trace_point_emit_u8(port_conf->disable_implicit_release);
>+	rte_trace_point_emit_u32(port_conf->event_port_cfg);
> 	rte_trace_point_emit_ptr(conf_cb);
> 	rte_trace_point_emit_int(rc);
> )
>@@ -257,7 +258,7 @@ RTE_TRACE_POINT(
> 	rte_trace_point_emit_i32(port_conf->new_event_threshold);
> 	rte_trace_point_emit_u16(port_conf->dequeue_depth);
> 	rte_trace_point_emit_u16(port_conf->enqueue_depth);
>-	rte_trace_point_emit_u8(port_conf->disable_implicit_release);
>+	rte_trace_point_emit_u32(port_conf->event_port_cfg);
> )
>
> RTE_TRACE_POINT(
>diff --git a/lib/librte_eventdev/rte_eventdev_version.map
>b/lib/librte_eventdev/rte_eventdev_version.map
>index 3d9d0ca..2846d04 100644
>--- a/lib/librte_eventdev/rte_eventdev_version.map
>+++ b/lib/librte_eventdev/rte_eventdev_version.map
>@@ -100,7 +100,6 @@ EXPERIMENTAL {
> 	# added in 20.05
> 	__rte_eventdev_trace_configure;
> 	__rte_eventdev_trace_queue_setup;
>-	__rte_eventdev_trace_port_setup;
> 	__rte_eventdev_trace_port_link;
> 	__rte_eventdev_trace_port_unlink;
> 	__rte_eventdev_trace_start;
>@@ -134,4 +133,7 @@ EXPERIMENTAL {
> 	__rte_eventdev_trace_crypto_adapter_queue_pair_del;
> 	__rte_eventdev_trace_crypto_adapter_start;
> 	__rte_eventdev_trace_crypto_adapter_stop;
>+
>+	# changed in 20.11
>+	__rte_eventdev_trace_port_setup;
> };
>--
>2.6.4