[PATCH v15 02/11] doc: add sxe2 guide and release notes

[liujie5@linkdatatechnology.com]

From: Jie Liu <liujie5@linkdatatechnology.com>

Add a new guide for SXE2 PMD in the nics directory.
The guide contains driver capabilities, prerequisites,
and compilation/usage instructions.

Update the release notes to announce the addition of the
sxe2 network driver.

Signed-off-by: Jie Liu <liujie5@linkdatatechnology.com>
---
 doc/guides/nics/features/sxe2.ini      | 29 ++++++++++++++++++++++
 doc/guides/nics/index.rst              |  1 +
 doc/guides/nics/sxe2.rst               | 34 ++++++++++++++++++++++++++
 doc/guides/rel_notes/release_26_07.rst |  4 +++
 4 files changed, 68 insertions(+)
 create mode 100644 doc/guides/nics/features/sxe2.ini
 create mode 100644 doc/guides/nics/sxe2.rst

diff --git a/doc/guides/nics/features/sxe2.ini b/doc/guides/nics/features/sxe2.ini
new file mode 100644
index 0000000000..7e350bab54
--- /dev/null
+++ b/doc/guides/nics/features/sxe2.ini
@@ -0,0 +1,29 @@
+;
+; Supported features of the 'sxe2' network poll mode driver.
+;
+; Refer to default.ini for the full list of available PMD features.
+;
+; A feature with "P" indicates only be supported when non-vector path
+; is selected.
+;
+[Features]
+Fast mbuf free       = P
+Free Tx mbuf on demand = Y
+Burst mode info      = Y
+Queue start/stop     = Y
+Buffer split on Rx   = P
+Scattered Rx         = Y
+CRC offload          = Y
+VLAN offload         = Y
+QinQ offload         = P
+L3 checksum offload  = Y
+L4 checksum offload  = Y
+Timestamp offload    = P
+Inner L3 checksum    = P
+Inner L4 checksum    = P
+Rx descriptor status = Y
+Tx descriptor status = Y
+FreeBSD              = Y
+Linux                = Y
+x86-32               = Y
+x86-64               = Y
diff --git a/doc/guides/nics/index.rst b/doc/guides/nics/index.rst
index cb818284fe..e20be478f8 100644
--- a/doc/guides/nics/index.rst
+++ b/doc/guides/nics/index.rst
@@ -68,6 +68,7 @@ Network Interface Controller Drivers
     rnp
     sfc_efx
     softnic
+    sxe2
     tap
     thunderx
     txgbe
diff --git a/doc/guides/nics/sxe2.rst b/doc/guides/nics/sxe2.rst
new file mode 100644
index 0000000000..7fcf9c085b
--- /dev/null
+++ b/doc/guides/nics/sxe2.rst
@@ -0,0 +1,34 @@
+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright (C), 2025, Wuxi Stars Micro System Technologies Co., Ltd.
+
+SXE2 Poll Mode Driver
+======================
+
+The sxe2 PMD (**librte_net_sxe2**) provides poll mode driver support for
+10/25/50/100 Gbps Network Adapters.
+The embedded switch, Physical Functions (PF),
+and SR-IOV Virtual Functions (VF) are supported.
+
+Implementation details
+----------------------
+
+The sxe2 PMD is designed to operate alongside the sxe2 kernel network driver.
+For management and control operations, the PMD communicates with the kernel
+driver via ioctl interfaces. These commands are processed by the kernel
+driver and subsequently dispatched to the hardware firmware for execution.
+
+For security and robustness, the driver's data path is optimized to operate
+using virtual addresses (IOVA as VA mode). However, to ensure full
+compatibility in system environments where an IOMMU is absent or disabled,
+the driver also provides an explicit path to support physical addressing
+(IOVA as PA mode).
+
+The hardware is capable of handling the corresponding IOVA addresses (either
+VA or PA) directly, as provided by the DPDK memory subsystem. This ensures
+that DPDK applications can only access memory segments explicitly allocated
+to the current process, preventing unauthorized access to random physical
+memory.
+
+This capability allows the PMD to coexist with kernel network interfaces
+which remain functional, although they stop receiving unicast packets as
+long as they share the same MAC address.
diff --git a/doc/guides/rel_notes/release_26_07.rst b/doc/guides/rel_notes/release_26_07.rst
index f012d47a4b..fa0f0f5cca 100644
--- a/doc/guides/rel_notes/release_26_07.rst
+++ b/doc/guides/rel_notes/release_26_07.rst
@@ -64,6 +64,10 @@ New Features
   * ``--auto-probing`` enables the initial bus probing, which is the current default behavior.
 
 
+* **Added Linkdata sxe2 ethernet driver.**
+
+  Added network driver for the Linkdata Network Adapters.
+
 Removed Items
 -------------
 
-- 
2.47.3