[PATCH] doc: add known igb_uio issue for i40e
From: Qiming Yang <hidden>
Date: 2017-03-27 09:25:03
Subsystem:
the rest · Maintainer:
Linus Torvalds
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 <redacted> --- doc/guides/nics/i40e.rst | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
index 043de34..f4073c2 100644
--- a/doc/guides/nics/i40e.rst
+++ b/doc/guides/nics/i40e.rst@@ -467,3 +467,16 @@ Incorrect Rx statistics when packet is oversize When a packet is over maximum frame size, the packet is dropped. However the Rx statistics, when calling `rte_eth_stats_get` incorrectly shows it as received. + +igb uio legacy mode can not be used in X710/XL710/XXV710 +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +When insmod ``igb_uio`` with ``intr_mode=legacy`` and test link status +interrupt, it will cause Input/Output error when reading file descriptor. +The root cause is X710/XL710/XXV710 NICs lack support for indicating INTx +is asserted via the interrupt bit in the PCI status register. Linux delect +them from INTx support table. The related link `linux kernel commit <https: +//git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/ +drivers/pci/quirks.c?id=8bcf4525c5d43306c5fd07e132bc8650e3491aec>`_. + +NOTE: happening when Linux kernel version >= 4.7
--
2.7.4