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doc: add known issue for i40e PHY link up

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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@intel.com>
Acked-by: Marko Kovacevic <marko.kovacevic@intel.com>
This commit is contained in:
Jeff Guo 2018-11-16 10:38:18 +08:00 committed by Ferruh Yigit
parent f63ffee26f
commit c420697314
1 changed files with 28 additions and 0 deletions
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28
doc/guides/rel_notes/known_issues.rst
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@ -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 invoke 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).