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[v1] doc: update DLB2 documentation

Message ID 20220926230703.1388093-1-abdullah.sevincer@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Jerin Jacob
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Series [v1] doc: update DLB2 documentation | expand


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Commit Message

Abdullah Sevincer Sept. 26, 2022, 11:07 p.m. UTC
This commit updates the dlb2.rst eventdev guide to document a
new devarg. A new devarg: "default_port_allocation" added
to allow default ldb port allocation scheme.

Signed-off-by: Abdullah Sevincer <abdullah.sevincer@intel.com>
 doc/guides/eventdevs/dlb2.rst | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
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diff --git a/doc/guides/eventdevs/dlb2.rst b/doc/guides/eventdevs/dlb2.rst
index 5b21f13b68..7b01d5c070 100644
--- a/doc/guides/eventdevs/dlb2.rst
+++ b/doc/guides/eventdevs/dlb2.rst
@@ -414,3 +414,22 @@  Note that the weight may not exceed the maximum CQ depth.
        --allow ea:00.0,cq_weight=all:<weight>
        --allow ea:00.0,cq_weight=qidA-qidB:<weight>
        --allow ea:00.0,cq_weight=qid:<weight>
+Default LDB Port Allocation
+For optimal load balancing ports that map to one or more QIDs in common
+should not be in numerical sequence. The port->QID mapping is application
+dependent, but the driver interleaves port IDs as much as possible to
+reduce the likelihood of sequential ports mapping to the same QID(s).
+Hence, DLB uses an initial allocation of Port IDs to maximize the
+average distance between an ID and its immediate neighbors. (i.e.the
+distance from 1 to 0 and to 2, the distance from 2 to 1 and to 3, etc.).
+Initial port allocation option can be passed through devarg. If y (or Y)
+inial port allocation will be used, otherwise initial port allocation
+won't be used.
+    .. code-block:: console
+       --allow ea:00.0,default_port_allocation=<y/Y>