When insmod "igb_uio" with "intr_mode=legacy and test link
status interrupt. Since INTx interrupt is not supported by
X710/XL710/XXV710, it will cause Input/Output error when
reading file descriptor.
Signed-off-by: Qiming Yang <qiming.y...@intel.com>
Acked-by Jingjing Wu <jingjing...@intel.com>
Acked-by: John McNamara <john.mcnam...@intel.com>
---
v2 changes:
* move the description to rel_notes/known_issues.rst
v3 changes:
* fixed a doc build warning
---
---
doc/guides/rel_notes/known_issues.rst | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/doc/guides/rel_notes/known_issues.rst
b/doc/guides/rel_notes/known_issues.rst
index f149ac7..a5592b0 100644
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -697,3 +697,27 @@ virtio tx_burst() function cannot do TSO on shared packets
**Driver/Module**:
Poll Mode Driver (PMD).
+
+
+igb uio legacy mode can not be used in X710/XL710/XXV710
+--------------------------------------------------------
+
+**Description**:
+ X710/XL710/XXV710 NICs lack support for indicating INTx is asserted via the
interrupt
+ bit in the PCI status register. Linux delected them from INTx support
table. The related
+ link
`<https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/drivers/pci/quirks.c?id=8bcf4525c5d43306c5fd07e132bc8650e3491aec>`_.
+
+**Implication**:
+ When insmod ``igb_uio`` with ``intr_mode=legacy`` and test link status
interrupt. Since
+ INTx interrupt is not supported by X710/XL710/XXV710, it will cause
Input/Output error
+ when reading file descriptor.
+
+**Resolution/Workaround**:
+ Do not bind ``igb_uio`` with legacy mode in X710/XL710/XXV710 NICs, or do
not use kernel
+ version >4.7 when you bind ``igb_uio`` with legacy mode.
+
+**Affected Environment/Platform**:
+ ALL.
+
+**Driver/Module**:
+ Poll Mode Driver (PMD).
--
2.4.11
