pm24.git/samples/bpf, branch v6.6

samples/bpf: Add note to README about the XDP utilities moved to xdp-tools

2023-08-24T15:43:50Z

To help users find the XDP utilities, add a note to the README about the new location and the conversion documentation in the commit messages. Signed-off-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20230824102255.1561885-8-toke@redhat.com Signed-off-by: Alexei Starovoitov

samples/bpf: Cleanup .gitignore

2023-08-24T15:43:50Z

Remove no longer present XDP utilities from .gitignore. Apart from the recently removed XDP utilities this also includes the previously removed xdpsock and xsk utilities. Signed-off-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20230824102255.1561885-7-toke@redhat.com Signed-off-by: Alexei Starovoitov

samples/bpf: Remove the xdp_sample_pkts utility

2023-08-24T15:43:50Z

The functionality of this utility is covered by the xdpdump utility in xdp-tools. There's a slight difference in usage as the xdpdump utility's main focus is to dump packets before or after they are processed by an existing XDP program. However, xdpdump also has the --load-xdp-program switch, which will make it attach its own program if no existing program is loaded. With this, xdp_sample_pkts usage can be converted as: xdp_sample_pkts eth0 --> xdpdump --load-xdp-program eth0 To get roughly equivalent behaviour. Signed-off-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20230824102255.1561885-6-toke@redhat.com Signed-off-by: Alexei Starovoitov

samples/bpf: Remove the xdp1 and xdp2 utilities

2023-08-24T15:43:50Z

The functionality of these utilities have been incorporated into the xdp-bench utility in xdp-tools. Equivalent functionality is: xdp1 eth0 --> xdp-bench drop -p parse-ip -l load-bytes eth0 xdp2 eth0 --> xdp-bench drop -p swap-macs eth0 Note that there's a slight difference in behaviour of those examples: the swap-macs operation of xdp-bench doesn't use the bpf_xdp_load_bytes() helper to load the packet data, whereas the xdp2 utility did so unconditionally. For the parse-ip action the use of bpf_xdp_load_bytes() can be selected by the '-l load-bytes' switch, with the difference that the xdp-bench utility will perform two separate calls to the helper, one to load the ethernet header and another to load the IP header; where the xdp1 utility only performed one call always loading 60 bytes of data. Signed-off-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20230824102255.1561885-5-toke@redhat.com Signed-off-by: Alexei Starovoitov

samples/bpf: Remove the xdp_rxq_info utility

2023-08-24T15:43:50Z

The functionality of this utility has been incorporated into the xdp-bench utility in xdp-tools, by way of the --rxq-stats argument to the 'drop', 'pass' and 'tx' commands of xdp-bench. Some examples of how to convert xdp_rxq_info invocations into equivalent xdp-bench commands: xdp_rxq_info -d eth0 --> xdp-bench pass --rxq-stats eth0 xdp_rxq_info -d eth0 -a XDP_DROP -m --> xdp-bench drop --rxq-stats -p swap-macs eth0 Signed-off-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20230824102255.1561885-4-toke@redhat.com Signed-off-by: Alexei Starovoitov

samples/bpf: Remove the xdp_redirect* utilities

2023-08-24T15:43:50Z

These utilities have all been ported to xdp-tools as functions of the xdp-bench utility. The four different utilities in samples are incorporated as separate subcommands to xdp-bench, with most of the command line parameters left intact, except that mandatory arguments are always positional in xdp-bench. For full usage details see the --help output of each command, or the xdp-bench man page. Some examples of how to convert usage to xdp-bench are: xdp_redirect eth0 eth1 --> xdp-bench redirect eth0 eth1 xdp_redirect_map eth0 eth1 --> xdp-bench redirect-map eth0 eth1 xdp_redirect_map_multi eth0 eth1 eth2 eth3 --> xdp-bench redirect-multi eth0 eth1 eth2 eth3 xdp_redirect_cpu -d eth0 -c 0 -c 1 --> xdp-bench redirect-cpu -c 0 -c 1 eth0 xdp_redirect_cpu -d eth0 -c 0 -c 1 -r eth1 --> xdp-bench redirect-cpu -c 0 -c 1 eth0 -r redirect -D eth1 Signed-off-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20230824102255.1561885-3-toke@redhat.com Signed-off-by: Alexei Starovoitov

samples/bpf: Remove the xdp_monitor utility

2023-08-24T15:43:50Z

This utility has been ported as-is to xdp-tools as 'xdp-monitor'. The only difference in usage between the samples and xdp-tools versions is that the '-v' command line parameter has been changed to '-e' in the xdp-tools version for consistency with the other utilities. Signed-off-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20230824102255.1561885-2-toke@redhat.com Signed-off-by: Alexei Starovoitov

samples/bpf: simplify spintest with kprobe.multi

2023-08-21T22:39:10Z

With the introduction of kprobe.multi, it is now possible to attach multiple kprobes to a single BPF program without the need for multiple definitions. Additionally, this method supports wildcard-based matching, allowing for further simplification of BPF programs. In here, an asterisk (*) wildcard is used to map to all symbols relevant to spin_{lock|unlock}. Furthermore, since kprobe.multi handles symbol matching, this commit eliminates the need for the previous logic of reading the ksym table to verify the existence of symbols. Signed-off-by: Daniel T. Lee Link: https://lore.kernel.org/r/20230818090119.477441-10-danieltimlee@gmail.com Signed-off-by: Alexei Starovoitov

samples/bpf: refactor syscall tracing programs using BPF_KSYSCALL macro

2023-08-21T22:39:10Z

This commit refactors the syscall tracing programs by adopting the BPF_KSYSCALL macro. This change aims to enhance the clarity and simplicity of the BPF programs by reducing the complexity of argument parsing from pt_regs. Signed-off-by: Daniel T. Lee Link: https://lore.kernel.org/r/20230818090119.477441-9-danieltimlee@gmail.com Signed-off-by: Alexei Starovoitov

samples/bpf: fix broken map lookup probe

2023-08-21T22:39:09Z

In the commit 7c4cd051add3 ("bpf: Fix syscall's stackmap lookup potential deadlock"), a potential deadlock issue was addressed, which resulted in *_map_lookup_elem not triggering BPF programs. (prior to lookup, bpf_disable_instrumentation() is used) To resolve the broken map lookup probe using "htab_map_lookup_elem", this commit introduces an alternative approach. Instead, it utilize "bpf_map_copy_value" and apply a filter specifically for the hash table with map_type. Signed-off-by: Daniel T. Lee Fixes: 7c4cd051add3 ("bpf: Fix syscall's stackmap lookup potential deadlock") Link: https://lore.kernel.org/r/20230818090119.477441-8-danieltimlee@gmail.com Signed-off-by: Alexei Starovoitov