[PATCH 01/10] doc/guides/bbdevs: add ark baseband device documentation

[John Miller <john.miller@atomicrules.com>]

Add new ark baseband device documentation.

This is the first patch in the series that introduces
the Arkville baseband PMD.

First we create a common/ark directory and move common files
from net/ark to share with the new baseband/ark device.

Next we create baseband/ark and introduce the Arkville baseband PMD,
including documentation.

Finally we modify the build system to support the changes.

Signed-off-by: John Miller <john.miller@atomicrules.com>
---
 doc/guides/bbdevs/ark.rst | 54 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 doc/guides/bbdevs/ark.rst

diff --git a/doc/guides/bbdevs/ark.rst b/doc/guides/bbdevs/ark.rst
new file mode 100644
index 0000000000..3bbe885e75
--- /dev/null
+++ b/doc/guides/bbdevs/ark.rst
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (c) 2015-2022 Atomic Rules LLC
+ */
+
+
+=============================================
+ Atomic Rules LLC, Baseband Poll Mode Driver
+=============================================
+
+The Atomic Rules, Arkville Baseband poll model driver supports the data
+movement portion of a baseband device implemented within an FPGA.
+The specifics of the encode or decode functions within the FPGA are
+outside the scope of Arkville's data movement. Hence this PMD requires and
+provides for the customization needed to advertise its
+features and support for out-of-band (or meta data) to accompany packet
+data between the FPGA device and the host software.
+
+
+==========
+ Features
+==========
+
+* Support for LDPC encode and decode operations.
+* Support for Turbo encode and decode operations.
+* Support for scatter/gather.
+* Support Mbuf data room sizes upto 32K bytes for improved performance.
+* Support for upto 64 queues
+* Support for runtime switching of Mbuf size, per queue, for improved perormance.
+* Support for PCIe Gen3x16, Gen4x16, and Gen5x8 endpoints.
+
+
+=================================
+ Required Customization Functions
+=================================
+
+The following customization functions are required:
+  * Set the capabilities structure for the device `ark_bbdev_info_get()`
+  * An optional device start function `rte_pmd_ark_bbdev_start()`
+  * An optional device stop function `rte_pmd_ark_bbdev_stop()`
+  * Functions for defining meta data format shared between
+    the host and FPGA.
+    `rte_pmd_ark_bbdev_enqueue_ldpc_dec()`,
+    `rte_pmd_ark_bbdev_dequeue_ldpc_dec()`,
+    `rte_pmd_ark_bbdev_enqueue_ldpc_enc()`,
+    `rte_pmd_ark_bbdev_dequeue_ldpc_enc()`.
+
+
+=============
+ Limitations
+=============
+
+* MBufs for the output data from the operation must be sized exactly
+   to hold the result based on DATAROOM sizes.
+* Side-band or meta data accompaning packet data is limited to 20 Bytes.
-- 
2.25.1