DPDK patches and discussions
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From: Bruce Richardson <bruce.richardson@intel.com>
To: dev@dpdk.org
Cc: Ma Lihong <lihongx.ma@intel.com>,
	Hemant Agrawal <hemant.agrawal@nxp.com>,
	Bruce Richardson <bruce.richardson@intel.com>
Subject: [dpdk-dev] [PATCH v2 3/3] doc: add notes on overriding extra config values
Date: Thu,  3 Sep 2020 15:49:42 +0100
Message-ID: <20200903144942.671870-4-bruce.richardson@intel.com> (raw)
In-Reply-To: <20200903144942.671870-1-bruce.richardson@intel.com>

Since it's possible to tweak the DPDK build a little further using CFLAGS,
we note that in the documentation.

Suggested-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 doc/guides/linux_gsg/build_dpdk.rst       | 8 ++++++++
 doc/guides/prog_guide/build-sdk-meson.rst | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/doc/guides/linux_gsg/build_dpdk.rst b/doc/guides/linux_gsg/build_dpdk.rst
index c536e354e..9c242069e 100644
--- a/doc/guides/linux_gsg/build_dpdk.rst
+++ b/doc/guides/linux_gsg/build_dpdk.rst
@@ -117,6 +117,14 @@ dependencies are met on the current system are built.
 When `-Dexamples=all` is set as a meson option, meson will check each example application to see if it can be built,
 and add all which can be built to the list of tasks in the ninja build configuration file.
 
+.. note::
+
+    A number of buildtime constants are present in DPDK, listed in file ``config/rte_config.h``.
+    While these should not normally need to be changed,
+    they can be overridden by setting the new value of the constant in the ``CFLAGS`` environment variable,
+    or via ``c_args`` meson parameter.
+    For example: ``meson configure -Dc_args="-DRTE_PKTMBUF_HEADROOM=256"``
+
 Building Applications Using Installed DPDK
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/doc/guides/prog_guide/build-sdk-meson.rst b/doc/guides/prog_guide/build-sdk-meson.rst
index 44d1cafdf..3838871a3 100644
--- a/doc/guides/prog_guide/build-sdk-meson.rst
+++ b/doc/guides/prog_guide/build-sdk-meson.rst
@@ -68,6 +68,14 @@ built into meson, while others, such as ``max_lcores``, or the list of
 examples to build, are DPDK-specific. To have a list of all options
 available run ``meson configure`` in the build directory.
 
+.. note::
+
+    A number of buildtime constants are present in DPDK, listed in file ``config/rte_config.h``.
+    While these should not normally need to be changed,
+    they can be overridden by setting the new value of the constant in the ``CFLAGS`` environment variable,
+    or via ``c_args`` meson parameter.
+    For example: ``meson configure -Dc_args="-DRTE_PKTMBUF_HEADROOM=256"``
+
 Examples of adjusting the defaults when doing initial meson configuration.
 Project-specific options are passed used -Doption=value::
 
-- 
2.25.1


  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-25 11:44 [dpdk-dev] [PATCH 1/2] config: remove explicit undefinition of unset values Bruce Richardson
2020-08-25 11:44 ` [dpdk-dev] [PATCH 2/2] config: allow overriding some build defaults Bruce Richardson
2020-09-01  5:17   ` Ma, LihongX
2020-09-01  6:07     ` Hemant Agrawal
2020-09-01  9:02       ` Bruce Richardson
2020-09-03 14:50       ` Bruce Richardson
2020-09-03 14:49 ` [dpdk-dev] [PATCH v2 0/3] Allow overriding of build-time constants Bruce Richardson
2020-09-03 14:49   ` [dpdk-dev] [PATCH v2 1/3] config: remove explicit undefinition of unset values Bruce Richardson
2020-09-03 14:49   ` [dpdk-dev] [PATCH v2 2/3] config: allow overriding some build defaults Bruce Richardson
2020-09-03 14:49   ` Bruce Richardson [this message]
2020-09-03 15:43     ` [dpdk-dev] [PATCH v2 3/3] doc: add notes on overriding extra config values Hemant Agrawal
2020-10-14 14:20   ` [dpdk-dev] [PATCH v2 0/3] Allow overriding of build-time constants Bruce Richardson
2020-10-15  8:55     ` Chen, BoX C
2020-10-15  9:20       ` Bruce Richardson
2020-10-16 15:47   ` David Marchand
2020-10-16 15:55     ` Bruce Richardson
2020-10-16 16:46       ` David Marchand
2020-10-19 10:21         ` Bruce Richardson
2020-10-19 21:04           ` Thomas Monjalon
2020-10-20  8:34             ` Bruce Richardson
2020-10-20 10:04               ` Thomas Monjalon
2020-10-20 10:15                 ` Bruce Richardson
2020-10-28 16:32   ` Bruce Richardson

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