From: Qiming Yang <qiming.yang@intel.com>
To: dev@dpdk.org
Cc: Qiming Yang <qiming.yang@intel.com>
Subject: [PATCH] doc: add known igb_uio issue for i40e
Date: Mon, 27 Mar 2017 17:16:17 +0800 [thread overview]
Message-ID: <1490606177-38274-1-git-send-email-qiming.yang@intel.com> (raw)
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.yang@intel.com>
---
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
next reply other threads:[~2017-03-27 9:25 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-27 9:16 Qiming Yang [this message]
2017-03-30 12:08 ` [PATCH] doc: add known igb_uio issue for i40e Wu, Jingjing
2017-04-03 10:40 ` Ferruh Yigit
2017-04-03 13:30 ` Mcnamara, John
2017-04-13 3:08 ` [PATCH v2] " Qiming Yang
2017-04-14 16:03 ` Mcnamara, John
2017-04-14 16:53 ` Ferruh Yigit
2017-04-19 4:16 ` [PATCH v3] " Qiming Yang
2017-04-19 10:06 ` Ferruh Yigit
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