On 11/9/2018 1:48 AM, Zhang, Qi Z wrote:
-----Original Message----- From: Guo, Jia Sent: Thursday, November 8, 2018 12:18 AM To: Xing, Beilei <beilei.x...@intel.com>; Kovacevic, Marko <marko.kovace...@intel.com>; Mcnamara, John <john.mcnam...@intel.com>; Zhang, Qi Z <qi.z.zh...@intel.com> Cc: dev@dpdk.org; Guo, Jia <jia....@intel.com>; Zhang, Helin <helin.zh...@intel.com>; Wu, Jingjing <jingjing...@intel.com> Subject: [PATCH V2] doc: add known PHY link up issue for i40e If bind i40e NICs with PMD and run application, after application quits, some kernel driver may not be able to set PHY to link up again by ``ifconfig`` after NICs be rebound to kernel driver. Signed-off-by: Jeff Guo <jia....@intel.com> --- v2->v1: refine some typo and word. --- doc/guides/rel_notes/known_issues.rst | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst index 95e4ce6..f4e3519 100644 --- a/doc/guides/rel_notes/known_issues.rst +++ b/doc/guides/rel_notes/known_issues.rst @@ -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**: + If bind i40e NICs with PMD and run application, after application quits, some + kernel driver may not be able to set PHY to link up again by ``ifconfig`` + after NICs be rebound to kernel driver.Should we switch the content of "description" and "implication"?
I think **Description** is aim to explain the meaning of the title and give the detail of the phenomenon to acknowledge it.
And **Implication** is what is the true thing behind the phenomenon and show which version will be expected to fix. I believe
other part in document is the same and it will no have a big gap here. If you find the problem, please give your solid reason here.
Anyway, i think it should be fine and want you could accept my explanation.
+ +**Implication**: + Before application quits, it will invokes the function ``i40e_dev_stop``, + which will set PHY to link down. This is the situation that some kernel + driver may not be able to handle link status correctly after it retakes + control of the device. 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 + previous versions, it will encounter this issue. + +**Resolution/Workaround**: + If it does not help by remove and reinsert i40e kernel driver, please reboot system. + +**Affected Environment/Platform**: + All. + +**Driver/Module**: + Poll Mode Driver (PMD). -- 2.7.4
