kernel/linux.git/samples/bpf/xdp_monitor_user.c, branch v5.18

samples: bpf: Convert xdp_monitor to XDP samples helper

2021-08-24T21:48:41+00:00

Use the libbpf skeleton facility and other utilities provided by XDP samples helper. A lot of the code in xdp_monitor and xdp_redirect_cpu has been moved to the xdp_sample_user.o helper, so we remove the duplicate functions here that are no longer needed. Thanks to BPF skeleton, we no longer depend on order of tracepoints to uninstall them on startup. Instead, the sample mask is used to install the needed tracepoints. Signed-off-by: Kumar Kartikeya Dwivedi Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20210821002010.845777-15-memxor@gmail.com

bpf: samples: Do not touch RLIMIT_MEMLOCK

2020-12-03T02:32:47+00:00

Since bpf is not using rlimit memlock for the memory accounting and control, do not change the limit in sample applications. Signed-off-by: Roman Gushchin Signed-off-by: Alexei Starovoitov Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20201201215900.3569844-35-guro@fb.com

samples: bpf: Refactor xdp_monitor with libbpf

2020-10-11T19:14:36+00:00

To avoid confusion caused by the increasing fragmentation of the BPF Loader program, this commit would like to change to the libbpf loader instead of using the bpf_load. Thanks to libbpf's bpf_link interface, managing the tracepoint BPF program is much easier. bpf_program__attach_tracepoint manages the enable of tracepoint event and attach of BPF programs to it with a single interface bpf_link, so there is no need to manage event_fd and prog_fd separately. This commit refactors xdp_monitor with using this libbpf API, and the bpf_load is removed and migrated to libbpf. Signed-off-by: Daniel T. Lee Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20201010181734.1109-2-danieltimlee@gmail.com

bpf, xdp, samples: Fix null pointer dereference in *_user code

2020-06-16T12:55:35+00:00

Memset on the pointer right after malloc can cause a NULL pointer deference if it failed to allocate memory. A simple fix is to replace malloc()/memset() pair with a simple call to calloc(). Fixes: 0fca931a6f21 ("samples/bpf: program demonstrating access to xdp_rxq_info") Signed-off-by: Gaurav Singh Signed-off-by: Daniel Borkmann Acked-by: Jesper Dangaard Brouer Acked-by: John Fastabend

samples/bpf: xdp_monitor use err code from tracepoint xdp:xdp_devmap_xmit

2018-05-25T01:36:15+00:00

Update xdp_monitor to use the recently added err code introduced in tracepoint xdp:xdp_devmap_xmit, to show if the drop count is caused by some driver general delivery problem. Other kind of drops will likely just be more normal TX space issues. Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Alexei Starovoitov

samples/bpf: xdp_monitor use tracepoint xdp:xdp_devmap_xmit

2018-05-25T01:36:15+00:00

The xdp_monitor sample/tool is updated to use the new tracepoint xdp:xdp_devmap_xmit the previous patch just introduced. Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Alexei Starovoitov

samples: bpf: include bpf/bpf.h instead of local libbpf.h

2018-05-15T05:52:10+00:00

There are two files in the tree called libbpf.h which is becoming problematic. Most samples don't actually need the local libbpf.h they simply include it to get to bpf/bpf.h. Include bpf/bpf.h directly instead. Signed-off-by: Jakub Kicinski Acked-by: Jesper Dangaard Brouer Signed-off-by: Alexei Starovoitov

samples/bpf: xdp_monitor, accept short options

2018-05-14T21:41:59+00:00

Updated optstring parameter for getopt_long() to accept short options. Also updated usage() function. Signed-off-by: Prashant Bhole Acked-by: Jesper Dangaard Brouer Signed-off-by: Daniel Borkmann

samples/bpf: fix xdp_monitor user output for tracepoint exception

2018-04-18T12:48:06+00:00

The variable rec_i contains an XDP action code not an error. Thus, using err2str() was wrong, it should have been action2str(). Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Daniel Borkmann

samples/bpf: xdp_monitor include cpumap tracepoints in monitoring

2018-01-20T01:10:55+00:00

The xdp_redirect_cpu sample have some "builtin" monitoring of the tracepoints for xdp_cpumap_*, but it is practical to have an external tool that can monitor these transpoint as an easy way to troubleshoot an application using XDP + cpumap. Specifically I need such external tool when working on Suricata and XDP cpumap redirect. Extend the xdp_monitor tool sample with monitoring of these xdp_cpumap_* tracepoints. Model the output format like xdp_redirect_cpu. Given I needed to handle per CPU decoding for cpumap, this patch also add per CPU info on the existing monitor events. This resembles part of the builtin monitoring output from sample xdp_rxq_info. Thus, also covering part of that sample in an external monitoring tool. Performance wise, the cpumap tracepoints uses bulking, which cause them to have very little overhead. Thus, they are enabled by default. Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Daniel Borkmann