[PATCH v2 2/3] kni: add deprecation warning at runtime

[Bruce Richardson <bruce.richardson@intel.com>]

When KNI is being used at runtime, output a warning message about its
deprecated status. This is part of the deprecation process for KNI
agreed by the DPDK technical board.[1]

[1] http://mails.dpdk.org/archives/dev/2022-June/243596.html

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 doc/guides/rel_notes/deprecation.rst | 6 ++----
 lib/kni/rte_kni.c                    | 2 ++
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 7c74725968..41e81be6ae 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -37,10 +37,8 @@ Deprecation Notices
   applications - other technologies such as virtio-user are recommended instead.
   Following the DPDK technical board
   `decision <https://mails.dpdk.org/archives/dev/2021-January/197077.html>`_
-  and `refinement <http://mails.dpdk.org/archives/dev/2022-June/243596.html>`_:
-
-  * Some deprecation warnings will be added in DPDK 22.11.
-  * The KNI kernel module, library and PMD will be removed from the DPDK 23.11.
+  and `refinement <http://mails.dpdk.org/archives/dev/2022-June/243596.html>`_,
+  the KNI kernel module, library and PMD will be removed from the DPDK 23.11 release.
 
 * lib: will fix extending some enum/define breaking the ABI. There are multiple
   samples in DPDK that enum/define terminated with a ``.*MAX.*`` value which is
diff --git a/lib/kni/rte_kni.c b/lib/kni/rte_kni.c
index 7971c56bb4..eb7c10ff19 100644
--- a/lib/kni/rte_kni.c
+++ b/lib/kni/rte_kni.c
@@ -96,6 +96,8 @@ static volatile int kni_fd = -1;
 int
 rte_kni_init(unsigned int max_kni_ifaces __rte_unused)
 {
+	RTE_LOG(WARNING, KNI, "WARNING: KNI is deprecated and will be removed in DPDK 23.11\n");
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
 	if (rte_eal_iova_mode() != RTE_IOVA_PA) {
 		RTE_LOG(ERR, KNI, "KNI requires IOVA as PA\n");
-- 
2.34.1