doc: add switch restart support to fm10k guide

Document how DPDK app should handle the event of switch quit-restart
to resume its network without an app-level restart.

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>

diff --git a/doc/guides/nics/fm10k.rst b/doc/guides/nics/fm10k.rst
index 7fc4862..b47fc0d 100644 (file)
--- a/doc/guides/nics/fm10k.rst
+++ b/doc/guides/nics/fm10k.rst
@@ -161,6 +161,17 @@ FM10000 PMD driver. The switch driver can be acquired from Intel support.
 Only Testpoint is validated with DPDK, the latest version that has been
 validated with DPDK is 4.1.6.
 
+Support for Switch Restart
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+For FM10000 multi host based design a DPDK app running in the VM or host needs
+to be aware of the switch's state since it may undergo a quit-restart. When
+the switch goes down the DPDK app will receive a LSC event indicating link
+status down, and the app should stop the worker threads that are polling on
+the Rx/Tx queues. When switch comes up, a LSC event indicating ``LINK_UP`` is
+sent to the app, which can then restart the FM10000 port to resume network
+processing.
+
 CRC striping
 ~~~~~~~~~~~~