On Sat, Jun 28, 2025 at 08:08:40PM +0800, Jason Xing wrote: > From: Jason Xing <kernelxing@xxxxxxxxxxx> > > 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@xxxxxxxxxxx> > --- > 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. Hi Jason, these commands above should be kept as-is imho and we should point users to new xdpsock's location: https://github.com/xdp-project/bpf-examples/tree/main/AF_XDP-example > - > -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 > >
