[dpdk-dev] [PATCH V3] doc: add known PHY link up issue for i40e
Jeff Guo
jia.guo at intel.com
Fri Nov 16 03:38:18 CET 2018
Some kernel drivers are not able to handle the link status correctly
after DPDK application sets the PHY to link down.
Signed-off-by: Jeff Guo <jia.guo at intel.com>
---
doc/guides/rel_notes/known_issues.rst | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
index 95e4ce6..03fe163 100644
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -759,3 +759,31 @@ Netvsc driver and application restart
**Driver/Module**:
``uio_hv_generic`` module.
+
+
+PHY link up fails when rebinding i40e NICs to kernel driver
+-----------------------------------------------------------
+
+**Description**:
+ Some kernel drivers are not able to handle the link status correctly
+ after DPDK application sets the PHY to link down.
+
+**Implication**:
+ The link status can't be set to "up" after the NIC is rebound to the
+ kernel driver. Before a DPDK application quits it will invokes the
+ function ``i40e_dev_stop()`` which will sets the PHY to link down. Some
+ kernel drivers may not be able to handle the link status correctly after
+ it retakes control of the device. This is a known PHY link configuration
+ issue in the i40e kernel driver. The fix has been addressed in the 2.7.4 rc
+ version. So if the i40e kernel driver is < 2.7.4 and doesn't have the
+ fix backported it will encounter this issue.
+
+**Resolution/Workaround**:
+ First try to remove and reinsert the i40e kernel driver. If that fails
+ reboot the system.
+
+**Affected Environment/Platform**:
+ All.
+
+**Driver/Module**:
+ Poll Mode Driver (PMD).
--
2.7.4
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