From: Anatoly Burakov <anatoly.burakov@intel.com>
To: dev@dpdk.org
Cc: John McNamara <john.mcnamara@intel.com>,
Marko Kovacevic <marko.kovacevic@intel.com>,
ferruh.yigit@intel.com, bruce.richardson@intel.com,
padraig.j.connolly@intel.com, stable@dpdk.org
Subject: [dpdk-dev] [PATCH 1/2] doc/linux_gsg: clarify instructions on running as non-root
Date: Mon, 24 Aug 2020 16:45:00 +0100 [thread overview]
Message-ID: <aca9a5986871ecb3aba7f476fa906a34dabc9e7e.1598283570.git.anatoly.burakov@intel.com> (raw)
The current instructions are slightly out of date when it comes to
providing information about setting up the system for using DPDK as
non-root, so update them.
Cc: stable@dpdk.org
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
doc/guides/linux_gsg/enable_func.rst | 54 ++++++++++++++++++++--------
1 file changed, 39 insertions(+), 15 deletions(-)
diff --git a/doc/guides/linux_gsg/enable_func.rst b/doc/guides/linux_gsg/enable_func.rst
index b2bda80bb7..78b0f7c012 100644
--- a/doc/guides/linux_gsg/enable_func.rst
+++ b/doc/guides/linux_gsg/enable_func.rst
@@ -58,22 +58,34 @@ The application can then determine what action to take, if any, if the HPET is n
if any, and on what is available on the system at runtime.
Running DPDK Applications Without Root Privileges
---------------------------------------------------------
+-------------------------------------------------
-.. note::
+In order to run DPDK as non-root, the following Linux filesystem objects'
+permissions should be adjusted to ensure that the Linux account being used to
+run the DPDK application has access to them:
- The instructions below will allow running DPDK as non-root with older
- Linux kernel versions. However, since version 4.0, the kernel does not allow
- unprivileged processes to read the physical address information from
- the pagemaps file, making it impossible for those processes to use HW
- devices which require physical addresses
+* All directories which serve as hugepage mount points, for example, ``/dev/hugepages``
-Although applications using the DPDK use network ports and other hardware resources directly,
-with a number of small permission adjustments it is possible to run these applications as a user other than "root".
-To do so, the ownership, or permissions, on the following Linux file system objects should be adjusted to ensure that
-the Linux user account being used to run the DPDK application has access to them:
+* If the HPET is to be used, ``/dev/hpet``
-* All directories which serve as hugepage mount points, for example, ``/mnt/huge``
+When running as non-root user, there may be some additional resource limits
+that are imposed by the system. Specifically, the following resource limits may
+need to be adjusted in order to ensure normal DPDK operation:
+
+* RLIMIT_LOCKS (number of file locks that can be held by a process)
+
+* RLIMIT_NOFILE (number of open file descriptors that can be held open by a process)
+
+* RLIMIT_MEMLOCK (amount of pinned pages the process is allowed to have)
+
+The above limits can usually be adjusted by editing
+``/etc/security/limits.conf`` file, and rebooting.
+
+Additionally, depending on which kernel driver is in use, the relevant
+resources also should be accessible by the user running the DPDK application.
+
+For ``igb_uio`` or ``uio_pci_generic`` kernel drivers, the following Linux file
+system objects' permissions should be adjusted:
* The userspace-io device files in ``/dev``, for example, ``/dev/uio0``, ``/dev/uio1``, and so on
@@ -82,11 +94,23 @@ the Linux user account being used to run the DPDK application has access to them
/sys/class/uio/uio0/device/config
/sys/class/uio/uio0/device/resource*
-* If the HPET is to be used, ``/dev/hpet``
-
.. note::
- On some Linux installations, ``/dev/hugepages`` is also a hugepage mount point created by default.
+ The instructions above will allow running DPDK with ``igb_uio`` driver as
+ non-root with older Linux kernel versions. However, since version 4.0, the
+ kernel does not allow unprivileged processes to read the physical address
+ information from the pagemaps file, making it impossible for those
+ processes to be used by non-privileged users. In such cases, using the VFIO
+ driver is recommended.
+
+For ``vfio-pci`` kernel driver, the following Linux file system objects'
+permissions should be adjusted:
+
+* The VFIO device file , ``/dev/vfio/vfio``
+
+* The directories under ``/dev/vfio`` that correspond to IOMMU group numbers of
+ devices intended to be used by DPDK, for example, ``/dev/vfio/50``
+
Power Management and Power Saving Functionality
-----------------------------------------------
--
2.17.1
next reply other threads:[~2020-08-24 15:45 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-24 15:45 Anatoly Burakov [this message]
2020-08-24 15:45 ` [dpdk-dev] [PATCH 2/2] doc/linux_gsg: update information on using hugepages Anatoly Burakov
2020-08-24 17:13 ` Bruce Richardson
2020-08-25 9:28 ` Burakov, Anatoly
2020-08-24 17:08 ` [dpdk-dev] [PATCH 1/2] doc/linux_gsg: clarify instructions on running as non-root Bruce Richardson
2020-08-25 9:29 ` Burakov, Anatoly
2020-08-25 7:47 ` Ferruh Yigit
2020-08-25 12:17 ` [dpdk-dev] [PATCH v2 " Anatoly Burakov
2020-08-25 13:06 ` Bruce Richardson
2020-08-25 13:57 ` [dpdk-dev] [PATCH v3 " Anatoly Burakov
2020-11-19 10:52 ` [dpdk-dev] [PATCH v4 1/2] doc: " Anatoly Burakov
2020-11-19 10:52 ` [dpdk-dev] [PATCH v4 2/2] doc/linux_gsg: update information on using hugepages Anatoly Burakov
2020-11-19 21:03 ` David Marchand
2020-11-20 10:50 ` Burakov, Anatoly
2020-11-27 15:23 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2020-08-25 13:57 ` [dpdk-dev] [PATCH v3 " Anatoly Burakov
2020-08-25 12:17 ` [dpdk-dev] [PATCH v2 " Anatoly Burakov
2020-08-25 13:10 ` Bruce Richardson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aca9a5986871ecb3aba7f476fa906a34dabc9e7e.1598283570.git.anatoly.burakov@intel.com \
--to=anatoly.burakov@intel.com \
--cc=bruce.richardson@intel.com \
--cc=dev@dpdk.org \
--cc=ferruh.yigit@intel.com \
--cc=john.mcnamara@intel.com \
--cc=marko.kovacevic@intel.com \
--cc=padraig.j.connolly@intel.com \
--cc=stable@dpdk.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).