[v2] doc: update device configuration in qat guide

[Ji, Kai]

Acked-by: Kai Ji <kai.ji at intel.com>

________________________________
From: Finn, Emma <emma.finn at intel.com>
Sent: 15 December 2025 10:41
To: Ji, Kai <kai.ji at intel.com>
Cc: dev at dpdk.org <dev at dpdk.org>; Finn, Emma <emma.finn at intel.com>
Subject: [v2] doc: update device configuration in qat guide

Added note for QAT driver information and device
configuration for services.

Signed-off-by: Emma Finn <emma.finn at intel.com>
---
 doc/guides/cryptodevs/qat.rst | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/doc/guides/cryptodevs/qat.rst b/doc/guides/cryptodevs/qat.rst
index 68d792e4cc..bae7724a76 100644
--- a/doc/guides/cryptodevs/qat.rst
+++ b/doc/guides/cryptodevs/qat.rst
@@ -501,6 +501,27 @@ If you are running on a kernel which includes a driver for your device, see
    The actual crypto services enabled on the system depend
    on QAT driver capabilities and hardware slice configuration.

+..note::
+
+   With the introduction of QAT Generation 4, the in-tree drivers are available within the
+   mainline Linux kernel. Out-of-tree (OOT) drivers for QAT Gen 4 are currently in sustaining
+   mode, meaning they will only receive maintenance updates without new feature development.
+   Future generations of QAT will be supported with in-tree drivers exclusively.
+
+.. note::
+
+   For **in-tree drivers**, when multiple QAT instances are available, each instance is assigned a
+   different crypto service by default (asym;sym or dc). The available crypto queue pair request
+   will return zero if the corresponding service is not enabled.
+
+   To verify the device configuration, run:
+    cat /sys/bus/pci/devices/<BDF>/qat/cfg_services
+
+   For symmetric and asymmetric crypto services, ensure that `"asym;sym"` are enabled.
+   For **out-of-tree drivers**, the configuration file for each instance can be found at:
+    /etc/<GEN>_dev<ID>.conf
+
+
 Installation using kernel.org driver
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

--
2.43.0

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