doc: add known PHY link up issue for i40e
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Commit Message
When application stop i40e nics and quit itself, if i40e nics be rebinded
from pmd to kernel driver, sometimes PHY can not be link up again any more.
Signed-off-by: Jeff Guo <jia.guo@intel.com>
---
doc/guides/rel_notes/known_issues.rst | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
@@ -759,3 +759,30 @@ Netvsc driver and application restart
**Driver/Module**:
``uio_hv_generic`` module.
+
+
+PHY link up failed when rebind i40e nics to kernel driver
+---------------------------------------------------------
+
+**Description**:
+ When application stop i40e nics and quit itself, if i40e nics be rebinded
+ from pmd to kernel driver, sometimes PHY can not be link up again any more.
+
+**Implication**:
+ when DPDK application quit and invoke the function ``i40e_dev_stop``, I40e
+ pmd will set PHY to be link down. After these unexpected configure which not
+ come from kernel driver, it will encounter link configure failure by using
+ kernel driver config tools ``ifconfig``. It is a known PHY link configure
+ synchronous issue in i40e kernel driver. The fix has been addressed in 2.7.4
+ rc version. So if the i40e kernel driver is < 2.7.4 and before the fix be
+ backported into the privous versions, use these kernel drivers will perhaps
+ have this issue.
+
+**Resolution/Workaround**:
+ If it does not help by re-insmod kernel driver, please reboot system.
+
+**Affected E0nvironment/Platform**:
+ All.
+
+**Driver/Module**:
+ Poll Mode Driver (PMD).