linux-toradex.git/samples/bpf/xdp_fwd_user.c, branch v6.2-rc6

samples/bpf: Check detach prog exist or not in xdp_fwd

2022-06-16T00:26:20+00:00

Before detach the prog, we should check detach prog exist or not.

Signed-off-by: Zhengchao Shao 
Signed-off-by: Andrii Nakryiko 
Reviewed-by: Toke Høiland-Jørgensen 
Link: https://lore.kernel.org/bpf/20220606005425.261967-1-shaozhengchao@huawei.com

samples/bpf: Get rid of bpf_prog_load_xattr() use

2022-02-03T15:32:25+00:00

Remove all the remaining uses of deprecated bpf_prog_load_xattr() API.

Signed-off-by: Andrii Nakryiko 
Signed-off-by: Daniel Borkmann 
Reviewed-by: Quentin Monnet 
Link: https://lore.kernel.org/bpf/20220202225916.3313522-7-andrii@kernel.org

samples/bpf: adapt samples/bpf to bpf_xdp_xxx() APIs

2022-01-21T05:22:02+00:00

Use new bpf_xdp_*() APIs across all XDP-related BPF samples.

Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/r/20220120061422.2710637-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov

samples/bpf: Stop using bpf_object__find_program_by_title API.

2021-12-14T22:38:05+00:00

bpf_object__find_program_by_title is going to be deprecated.
Replace use cases of bpf_object__find_program_by_title in samples/bpf/
with bpf_object__for_each_program.

Signed-off-by: Kui-Feng Lee 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20211214035931.1148209-3-kuifeng@fb.com

samples/bpf: Add missing option to xdp_fwd usage

2021-06-17T03:10:18+00:00

xdp_fwd usage() is missing the introduction of the "-S"
and "-F" options, this patch adds it.

Fixes: d50ecc46d18f ("samples/bpf: Attach XDP programs in driver mode by default")
Signed-off-by: Wang Hai 
Signed-off-by: Andrii Nakryiko 
Acked-by: Jesper Dangaard Brouer 
Link: https://lore.kernel.org/bpf/20210615135554.29158-1-wanghai38@huawei.com

samples/bpf: Use consistent include paths for libbpf

2020-01-21T00:37:45+00:00

Fix all files in samples/bpf to include libbpf header files with the bpf/
prefix, to be consistent with external users of the library. Also ensure
that all includes of exported libbpf header files (those that are exported
on 'make install' of the library) use bracketed includes instead of quoted.

To make sure no new files are introduced that doesn't include the bpf/
prefix in its include, remove tools/lib/bpf from the include path entirely,
and use tools/lib instead.

Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
Signed-off-by: Toke Høiland-Jørgensen 
Signed-off-by: Alexei Starovoitov 
Acked-by: Jesper Dangaard Brouer 
Acked-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk

samples/bpf: Attach XDP programs in driver mode by default

2019-12-16T15:05:38+00:00

When attaching XDP programs, userspace can set flags to request the attach
mode (generic/SKB mode, driver mode or hw offloaded mode). If no such flags
are requested, the kernel will attempt to attach in driver mode, and then
silently fall back to SKB mode if this fails.

The silent fallback is a major source of user confusion, as users will try
to load a program on a device without XDP support, and instead of an error
they will get the silent fallback behaviour, not notice, and then wonder
why performance is not what they were expecting.

In an attempt to combat this, let's switch all the samples to default to
explicitly requesting driver-mode attach. As part of this, ensure that all
the userspace utilities have a switch to enable SKB mode. For those that
have a switch to request driver mode, keep it but turn it into a no-op.

Signed-off-by: Toke Høiland-Jørgensen 
Signed-off-by: Alexei Starovoitov 
Acked-by: Jesper Dangaard Brouer 
Acked-by: David Ahern 
Link: https://lore.kernel.org/bpf/20191216110742.364456-1-toke@redhat.com

samples/bpf: make xdp_fwd more practically usable via devmap lookup

2019-08-09T16:05:03+00:00

This address the TODO in samples/bpf/xdp_fwd_kern.c, which points out
that the chosen egress index should be checked for existence in the
devmap. This can now be done via taking advantage of Toke's work in
commit 0cdbb4b09a06 ("devmap: Allow map lookups from eBPF").

This change makes xdp_fwd more practically usable, as this allows for
a mixed environment, where IP-forwarding fallback to network stack, if
the egress device isn't configured to use XDP.

Signed-off-by: Jesper Dangaard Brouer 
Reviewed-by: David Ahern 
Reviewed-by: Toke Høiland-Jørgensen 
Acked-by: Yonghong Song 
Signed-off-by: Daniel Borkmann

samples/bpf: xdp_fwd rename devmap name to be xdp_tx_ports

2019-08-09T16:05:03+00:00

The devmap name 'tx_port' came from a copy-paste from xdp_redirect_map
which only have a single TX port. Change name to xdp_tx_ports
to make it more descriptive.

Signed-off-by: Jesper Dangaard Brouer 
Reviewed-by: David Ahern 
Acked-by: Yonghong Song 
Reviewed-by: Toke Høiland-Jørgensen 
Signed-off-by: Daniel Borkmann

samples: bpf: refactor header include path

2019-06-17T22:28:36+00:00

Currently, header inclusion in each file is inconsistent.
For example, "libbpf.h" header is included as multiple ways.

    #include "bpf/libbpf.h"
    #include "libbpf.h"

Due to commit b552d33c80a9 ("samples/bpf: fix include path
in Makefile"), $(srctree)/tools/lib/bpf/ path had been included
during build, path "bpf/" in header isn't necessary anymore.

This commit removes path "bpf/" in header inclusion.

Signed-off-by: Daniel T. Lee 
Signed-off-by: Daniel Borkmann