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From: Qiming Yang <qiming.yang@intel.com>
To: dev@dpdk.org
Cc: jingjing.wu@intel.com, john.mcnamara@intel.com,
	Qiming Yang <qiming.yang@intel.com>
Subject: [dpdk-dev] [PATCH v2] doc: add known igb_uio issue for i40e
Date: Thu, 13 Apr 2017 11:08:33 +0800	[thread overview]
Message-ID: <1492052913-962-1-git-send-email-qiming.yang@intel.com> (raw)
In-Reply-To: <1490606177-38274-1-git-send-email-qiming.yang@intel.com>

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>
Acked-by Jingjing Wu <jingjing.wu@intel.com>
---
v2 changes:
* move the description to rel_notes/known_issues.rst
---
---
 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..61c2fa1 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 `linux kernel commit <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).
-- 
2.7.4

  parent reply	other threads:[~2017-04-13  3:17 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-27  9:16 [dpdk-dev] [PATCH] " Qiming Yang
2017-03-30 12:08 ` Wu, Jingjing
2017-04-03 10:40 ` Ferruh Yigit
2017-04-03 13:30   ` Mcnamara, John
2017-04-13  3:08 ` Qiming Yang [this message]
2017-04-14 16:03   ` [dpdk-dev] [PATCH v2] " Mcnamara, John
2017-04-14 16:53     ` Ferruh Yigit
2017-04-19  4:16   ` [dpdk-dev] [PATCH v3] " Qiming Yang
2017-04-19 10:06     ` Ferruh Yigit

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