From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id 26BEDFA57 for ; Mon, 27 Mar 2017 11:25:03 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=intel; t=1490606703; x=1522142703; h=from:to:cc:subject:date:message-id; bh=Ibxtm3WR7fHhJFmBv0sBYSu9gxnvY0jVP89THaXAgCY=; b=IcNsaIFVn1F6+N+prVwi/qLfrBSu8OtX3ym6Bm0oHF3ZjKi7TZXY0fup ALuwvzQQyVNMMtRCASFf3ShUkQ5JMA==; Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Mar 2017 02:25:02 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.36,231,1486454400"; d="scan'208";a="79679613" Received: from dpdk7.bj.intel.com ([172.16.182.73]) by orsmga005.jf.intel.com with ESMTP; 27 Mar 2017 02:25:01 -0700 From: Qiming Yang To: dev@dpdk.org Cc: Qiming Yang Date: Mon, 27 Mar 2017 17:16:17 +0800 Message-Id: <1490606177-38274-1-git-send-email-qiming.yang@intel.com> X-Mailer: git-send-email 2.7.4 Subject: [dpdk-dev] [PATCH] doc: add known igb_uio issue for i40e X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Mar 2017 09:25:03 -0000 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 --- 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 `_. + +NOTE: happening when Linux kernel version >= 4.7 -- 2.7.4