From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id 3F80B1B123 for ; Thu, 27 Sep 2018 11:32:58 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Sep 2018 02:32:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,310,1534834800"; d="scan'208";a="83677798" Received: from dpdk-xiaoyunl.sh.intel.com ([10.67.110.231]) by FMSMGA003.fm.intel.com with ESMTP; 27 Sep 2018 02:32:56 -0700 From: Xiaoyun Li To: beilei.xing@intel.com, qi.z.zhang@intel.com, dev@dpdk.org, wenzhuo.lu@intel.com, jingjing.wu@intel.com Cc: Xiaoyun Li Date: Thu, 27 Sep 2018 05:16:37 -0400 Message-Id: <1538039797-43828-1-git-send-email-xiaoyun.li@intel.com> X-Mailer: git-send-email 2.7.4 Subject: [dpdk-dev] [PATCH] doc: add known issue about legacy intr mode for ixgbe 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: Thu, 27 Sep 2018 09:32:58 -0000 When using uio_pci_generic module or using legacy interrupt mode of igb_uio or vfio, X550 cannot get interrupts. Because the Interrupt Status bit is not implemented, then the irq cannot be handled correctly and cannot report the event fd to DPDK apps. Add this hw limitation and details into ixgbe known issue. Signed-off-by: Xiaoyun Li --- doc/guides/nics/ixgbe.rst | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst index 16d6390..4f89a6d 100644 --- a/doc/guides/nics/ixgbe.rst +++ b/doc/guides/nics/ixgbe.rst @@ -200,6 +200,32 @@ There is no RTE API to add a VF's MAC address from the PF. On ixgbe, the ``rte_eth_dev_mac_addr_add()`` function can be used to add a VF's MAC address, as a workaround. +legacy interrupt mode and uio pci generic module cannot be used in X550 +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Desccription +^^^^^^^^^^^^ +X550 cannot get interrupts if using ``uio_pci_generic`` module or using legacy +interrupt mode of ``igb_uio`` or ``vfio``. Because the errata of X550 states +that the Interrupt Status bit is not implemented. The errata is the item #22 +from `X550 spec update +`_ + +Implication +^^^^^^^^^^^ +When using ``uio_pci_generic`` module or using legacy interrupt mode of +``igb_uio`` or ``vfio``, the Interrupt Status bit would be checked if the +interrupt is comming. Since the bit is not implemented in X550, the irq cannot +be handled correctly and cannot report the event fd to DPDK apps. Then apps +cannot get interrupts and ``dmesg`` will show messages like ``irq #No.: `` +``nobody cared.`` + +Workaround +^^^^^^^^^^ +Do not bind the ``uio_pci_generic`` module in X550 NICs. +Do not bind ``igb_uio`` with legacy mode in X550 NICs. +Before using ``vfio`` with legacy mode in X550 NICs, using ``modprobe vfio `` +``nointxmask=1`` to bind ``vfio``. Inline crypto processing support -------------------------------- -- 2.7.4