[PATCH v1] event/dlb2: update DLB documentation for history list config

[PATCH v1] event/dlb2: update DLB documentation for history list config

[Pravin Pathak]

Update DPDK documentation for configuring DLB hardware history
list resource using devargs arguments.

Fixes: 33ab065d0c40 ("event/dlb2: support managing history list resource")

Signed-off-by: Pravin Pathak <pravin.pathak@intel.com>
---
 doc/guides/eventdevs/dlb2.rst | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/doc/guides/eventdevs/dlb2.rst b/doc/guides/eventdevs/dlb2.rst
index 8ec7168f20..2f836db010 100644
--- a/doc/guides/eventdevs/dlb2.rst
+++ b/doc/guides/eventdevs/dlb2.rst
@@ -7,6 +7,12 @@ Driver for the Intel® Dynamic Load Balancer (DLB)
 The DPDK DLB poll mode driver supports the Intel® Dynamic Load Balancer,
 hardware versions 2.0 and 2.5.
 
+Please follow the links below to download the Programmer Guides.
+
+`Intel Dynamic Load Balancer 2.0 Programmer Guide <https://cdrdv2.intel.com/v1/dl/getContent/613545>`_. (Device: 0x2710)
+
+`Intel Dynamic Load Balancer 2.5 Programmer Guide <https://cdrdv2.intel.com/v1/dl/getContent/639481>`_. (Device: 0x2714)
+
 Prerequisites
 -------------
 
@@ -477,6 +483,23 @@ Example command to use as meson option for credit handling:
 
        meson configure -Dc_args='-DDLB_SW_CREDITS_CHECKS=0 -DDLB_HW_CREDITS_CHECKS=1'
 
+DLB History List Configuration
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Every DLB Load Balancing port (i.e., eventdev port not using RTE_EVENT_PORT_CFG_SINGLE_LINK flag)
+has a hardware resource call history list entries (HL) associated with it. This count decides the number
+of events that can be inflight to the port from the DLB hardware. DLB has 2048 total HL entries.
+As DLB supports 64 load-balanced ports, by default DLB PMD assigns 32 HL entries to each port.
+Following devargs arguments allow application to control HL entries overriding default mode.
+DLB API rte_pmd_dlb2_set_port_param() allows setting HL entries for the DLB eventdev ports.
+Please refer to section "Fine Tuning History List Entries" in DLB Programmer Guide for details.
+
+    .. code-block:: console
+
+       --allow ea:00.0,use_default_hl=0,alloc_hl_entries=1024
+
+        use_default_hl = 1=Enable (default), 0=Disable
+        alloc_hl_entries = 0-2048 Total HL entries
+
 Running Eventdev Applications with DLB Device
 ---------------------------------------------
 
-- 
2.39.1