X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Frel_notes%2Fknown_issues.rst;h=358dfa321f7d621fdd742ad8752391156fdf26f7;hb=f5a2e3bad4860ae4e3be2bfe13cff20aa93e3ba1;hp=37464a002b44553a689f36cd133f1c4a7989d4a3;hpb=86fa6c57a17588305865ccdcf57c9e7fd443829d;p=dpdk.git diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst index 37464a002b..358dfa321f 100644 --- a/doc/guides/rel_notes/known_issues.rst +++ b/doc/guides/rel_notes/known_issues.rst @@ -1,33 +1,5 @@ -.. BSD LICENSE - Copyright(c) 2010-2014 Intel Corporation. All rights reserved. - All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in - the documentation and/or other materials provided with the - distribution. - * Neither the name of Intel Corporation nor the names of its - contributors may be used to endorse or promote products derived - from this software without specific prior written permission. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - +.. SPDX-License-Identifier: BSD-3-Clause + Copyright(c) 2010-2014 Intel Corporation. Known Issues and Limitations in Legacy Releases =============================================== @@ -721,3 +693,171 @@ igb uio legacy mode can not be used in X710/XL710/XXV710 **Driver/Module**: Poll Mode Driver (PMD). + + +igb_uio can not be used when running l3fwd-power +------------------------------------------------ + +**Description**: + Link Status Change(LSC) interrupt and packet receiving interrupt are all enabled in l3fwd-power + APP. Because of UIO only support one interrupt, so these two kinds of interrupt need to share + one, and the receiving interrupt have the higher priority, so can't get the right link status. + +**Implication**: + When insmod ``igb_uio`` and running l3fwd-power APP, link status getting doesn't work properly. + +**Resolution/Workaround**: + Use vfio-pci when LSC and packet receiving interrupt enabled. + +**Affected Environment/Platform**: + ALL. + +**Driver/Module**: + ``igb_uio`` module. + + +Linux kernel 4.10.0 iommu attribute read error +---------------------------------------------- + +**Description**: + When VT-d is enabled (``iommu=pt intel_iommu=on``), reading IOMMU attributes from + /sys/devices/virtual/iommu/dmarXXX/intel-iommu/cap on Linux kernel 4.10.0 error. + This bug is fixed in `Linux commmit a7fdb6e648fb + `_, + This bug is introduced in `Linux commmit 39ab9555c241 + `_, + +**Implication**: + When binding devices to VFIO and attempting to run testpmd application, + testpmd (and other DPDK applications) will not initialize. + +**Resolution/Workaround**: + Use other linux kernel version. It only happens in linux kernel 4.10.0. + +**Affected Environment/Platform**: + ALL OS of linux kernel 4.10.0. + +**Driver/Module**: + ``vfio-pci`` module. + +Netvsc driver and application restart +------------------------------------- + +**Description**: + The Linux kernel uio_hv_generic driver does not completely shutdown and clean up + resources properly if application using Netvsc PMD exits. + +**Implication**: + When application using Netvsc PMD is restarted it can not complete initialization + handshake sequence with the host. + +**Resolution/Workaround**: + Either reboot the guest or remove and reinsert the hv_uio_generic module. + +**Affected Environment/Platform**: + Linux Hyper-V. + +**Driver/Module**: + ``uio_hv_generic`` module. + + +PHY link up fails when rebinding i40e NICs to kernel driver +----------------------------------------------------------- + +**Description**: + Some kernel drivers are not able to handle the link status correctly + after DPDK application sets the PHY to link down. + +**Implication**: + The link status can't be set to "up" after the NIC is rebound to the + kernel driver. Before a DPDK application quits it will invoke the + function ``i40e_dev_stop()`` which will sets the PHY to link down. Some + kernel drivers may not be able to handle the link status correctly after + it retakes control of the device. This is a known PHY link configuration + issue in the i40e kernel driver. The fix has been addressed in the 2.7.4 rc + version. So if the i40e kernel driver is < 2.7.4 and doesn't have the + fix backported it will encounter this issue. + +**Resolution/Workaround**: + First try to remove and reinsert the i40e kernel driver. If that fails + reboot the system. + +**Affected Environment/Platform**: + All. + +**Driver/Module**: + Poll Mode Driver (PMD). + + +Restricted vdev ethdev operations supported in secondary process +---------------------------------------------------------------- +**Description** + In current virtual device sharing model, Ethernet device data structure will be + shared between primary and secondary process. Only those Ethernet device operations + which based on it are workable in secondary process. + +**Implication** + Some Ethernet device operations like device start/stop will be failed on virtual + device in secondary process. + +**Affected Environment/Platform**: + ALL. + +**Driver/Module**: + Virtual Device Poll Mode Driver (PMD). + + +Kernel crash when hot-unplug igb_uio device while DPDK application is running +----------------------------------------------------------------------------- + +**Description**: + When device has been bound to igb_uio driver and application is running, + hot-unplugging the device may cause kernel crash. + +**Reason**: + When device is hot-unplugged, igb_uio driver will be removed which will destroy UIO resources. + Later trying to access any uio resource will cause kernel crash. + +**Resolution/Workaround**: + If using DPDK for PCI HW hot-unplug, prefer to bind device with VFIO instead of IGB_UIO. + +**Affected Environment/Platform**: + ALL. + +**Driver/Module**: + ``igb_uio`` module. + + +AVX-512 support disabled +------------------------ + +**Description**: + ``AVX-512`` support has been disabled on some conditions. + This shouldn't be confused with ``CONFIG_RTE_ENABLE_AVX512`` config option which is already + disabled by default. This config option defines if ``AVX-512`` specific implementations of + some file to be used or not. What has been disabled is compiler feature to produce ``AVX-512`` + instructions from any source code. + + On DPDK v18.11 ``AVX-512`` is disabled for all ``GCC`` builds which reported to cause a performance + drop. + + On DPDK v19.02 ``AVX-512`` disable scope is reduced to ``GCC`` and ``binutils version 2.30`` based + on information accured from the GCC community defect. + +**Reason**: + Generated ``AVX-512`` code cause crash: + https://bugs.dpdk.org/show_bug.cgi?id=97 + https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88096 + +**Resolution/Workaround**: + * Update ``binutils`` to newer version than ``2.30``. + + OR + + * Use different compiler, like ``clang`` for this case. + +**Affected Environment/Platform**: + ``GCC`` and ``binutils version 2.30``. + +**Driver/Module**: + ALL.