bpftool: Add 'prepend' option for tcx attach to insert at chain start#10683
bpftool: Add 'prepend' option for tcx attach to insert at chain start#10683kernel-patches-daemon-bpf[bot] wants to merge 2 commits intobpf-next_basefrom
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Add support for the 'prepend' option when attaching tcx_ingress and tcx_egress programs. This option allows inserting a BPF program at the beginning of the TCX chain instead of appending it at the end. The implementation uses BPF_F_BEFORE flag which automatically inserts the program at the beginning of the chain when no relative reference is specified. This change includes: - Modify do_attach_tcx() to support prepend insertion using BPF_F_BEFORE - Update documentation to describe the new 'prepend' option - Add bash completion support for the 'prepend' option on tcx attach types - Add example usage in the documentation - Add validation to reject 'overwrite' for non-XDP attach types The 'prepend' option is only valid for tcx_ingress and tcx_egress attach types. For XDP attach types, the existing 'overwrite' option remains available. Example usage: # bpftool net attach tcx_ingress name tc_prog dev lo prepend This feature is useful when the order of program execution in the TCX chain matters and users need to ensure certain programs run first. Co-developed-by: Siwan Kim <siwan.kim@navercorp.com> Signed-off-by: Siwan Kim <siwan.kim@navercorp.com> Signed-off-by: Gyutae Bae <gyutae.bae@navercorp.com> Reviewed-by: Quentin Monnet <qmo@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1040988 irrelevant now. Closing PR. |
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Pull request for series with
subject: bpftool: Add 'prepend' option for tcx attach to insert at chain start
version: 4
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1040988