From 86fa6c57a17588305865ccdcf57c9e7fd443829d Mon Sep 17 00:00:00 2001 From: Qiming Yang Date: Thu, 13 Apr 2017 11:08:33 +0800 Subject: [PATCH] doc: add known igb_uio issue for i40e 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 Acked-by Jingjing Wu Acked-by: John McNamara --- 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 f149ac7d0b..37464a002b 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 + `commit `_. + +**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). -- 2.20.1