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Message-Id: <20250628120841.12421-1-kerneljasonxing@gmail.com>
Date: Sat, 28 Jun 2025 20:08:40 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
bjorn@...nel.org,
magnus.karlsson@...el.com,
maciej.fijalkowski@...el.com,
jonathan.lemon@...il.com,
sdf@...ichev.me,
ast@...nel.org,
daniel@...earbox.net,
hawk@...nel.org,
john.fastabend@...il.com,
joe@...a.to,
willemdebruijn.kernel@...il.com
Cc: bpf@...r.kernel.org,
netdev@...r.kernel.org,
Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next] Documentation: xsk: correct the obsolete references and examples
From: Jason Xing <kernelxing@...cent.com>
The modified lines are mainly related to the following commits[1][2]
which remove those tests and examples. Since samples/bpf has been
deprecated, we can refer to more examples that are easily searched
in the various xdp-projects.
[1]: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f36600634
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=cfb5a2dbf14
Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
Documentation/networking/af_xdp.rst | 45 ++++++++---------------------
1 file changed, 12 insertions(+), 33 deletions(-)
diff --git a/Documentation/networking/af_xdp.rst b/Documentation/networking/af_xdp.rst
index dceeb0d763aa..37711619e89e 100644
--- a/Documentation/networking/af_xdp.rst
+++ b/Documentation/networking/af_xdp.rst
@@ -209,13 +209,10 @@ Libbpf
Libbpf is a helper library for eBPF and XDP that makes using these
technologies a lot simpler. It also contains specific helper functions
-in tools/lib/bpf/xsk.h for facilitating the use of AF_XDP. It
-contains two types of functions: those that can be used to make the
-setup of AF_XDP socket easier and ones that can be used in the data
-plane to access the rings safely and quickly. To see an example on how
-to use this API, please take a look at the sample application in
-samples/bpf/xdpsock_usr.c which uses libbpf for both setup and data
-plane operations.
+in ./tools/testing/selftests/bpf/xsk.h for facilitating the use of
+AF_XDP. It contains two types of functions: those that can be used to
+make the setup of AF_XDP socket easier and ones that can be used in the
+data plane to access the rings safely and quickly.
We recommend that you use this library unless you have become a power
user. It will make your program a lot simpler.
@@ -372,8 +369,7 @@ needs to explicitly notify the kernel to send any packets put on the
TX ring. This can be accomplished either by a poll() call, as in the
RX path, or by calling sendto().
-An example of how to use this flag can be found in
-samples/bpf/xdpsock_user.c. An example with the use of libbpf helpers
+An example with the use of libbpf helpers
would look like this for the TX path:
.. code-block:: c
@@ -551,10 +547,9 @@ Usage
In order to use AF_XDP sockets two parts are needed. The
user-space application and the XDP program. For a complete setup and
-usage example, please refer to the sample application. The user-space
-side is xdpsock_user.c and the XDP side is part of libbpf.
+usage example, please refer to the xdp-project.
-The XDP code sample included in tools/lib/bpf/xsk.c is the following:
+The XDP code sample is the following:
.. code-block:: c
@@ -753,27 +748,11 @@ to facilitate extending a zero-copy driver with multi-buffer support.
Sample application
==================
-There is a xdpsock benchmarking/test application included that
-demonstrates how to use AF_XDP sockets with private UMEMs. Say that
-you would like your UDP traffic from port 4242 to end up in queue 16,
-that we will enable AF_XDP on. Here, we use ethtool for this::
-
- ethtool -N p3p2 rx-flow-hash udp4 fn
- ethtool -N p3p2 flow-type udp4 src-port 4242 dst-port 4242 \
- action 16
-
-Running the rxdrop benchmark in XDP_DRV mode can then be done
-using::
-
- samples/bpf/xdpsock -i p3p2 -q 16 -r -N
-
-For XDP_SKB mode, use the switch "-S" instead of "-N" and all options
-can be displayed with "-h", as usual.
-
-This sample application uses libbpf to make the setup and usage of
-AF_XDP simpler. If you want to know how the raw uapi of AF_XDP is
-really used to make something more advanced, take a look at the libbpf
-code in tools/lib/bpf/xsk.[ch].
+Xdpsock benchmarking/test application can be found through googling
+the various xdp-project repositories connected to libxdp. If you want
+to know how the raw uapi of AF_XDP is really used to make something
+more advanced, take a look at the libbpf code in
+tools/testing/selftests/bpf/xsk.[ch].
FAQ
=======
--
2.41.3
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