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[libbpf] Questions about XDP/TC
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chenhengqi@...
1. How do I attach `BPF_PROG_TYPE_SCHED_CLS`/`classifier` BPF programs to specific data path(i.e. ingress or egress) using libbpf ?
I found some comments related in the source:
```
The **BPF_F_INGRESS** value in *flags* is used to make the distinction (ingress path is selected if the flag is present, egress path otherwise).
```
How can I get that flag, am I missing something ?
2. How do I attach `XDP` BPF programs using specific mode(i.e. xdpgeneric/xdpdrv)?
I tried googling but most of them lead to tc/ip tools. Thanks in advance. |
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Toke Høiland-Jørgensen
chenhengqi@... writes:
1. How do I attach `BPF_PROG_TYPE_SCHED_CLS`/`classifier` BPF programs to specific data path(i.e. ingress or egress) using libbpf ?libbpf does not yet support attaching to TC hooks, but there is work in progress to add this. See https://lore.kernel.org/bpf/20210325120020.236504-4-memxor@gmail.com/ (an updated version should hopefully show up soon). I found some comments related in the source:Just set XDP_FLAGS_SKB_MODE or XDP_FLAGS_DRV_MODE when attaching... -Toke |