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enable btf for offload.o & test.o The objdump -x visible changes between old and new versions of the mainline shipped .o files are really very minimal: just the inclusion of a new .BTF section and changes/removals of some 'l' entries from the symbol table. However, it turns out a change to symbol ordering is incompatible with BpfLoader <v0.10 which doesn't know to skip non-function symbols, and as such enabling btf requires a little bit of gymnastics. After: $ adbz shell ls -l /apex/com.android.tethering/etc/bpf/*.o -rw-r--r-- 1 system system 118352 1969-12-31 16:00 /apex/com.android.tethering/etc/bpf/offload.o -rw-r--r-- 1 system system 123424 1969-12-31 16:00 /apex/com.android.tethering/etc/bpf/offload@btf.o -rw-r--r-- 1 system system 2232 1969-12-31 16:00 /apex/com.android.tethering/etc/bpf/test.o -rw-r--r-- 1 system system 6376 1969-12-31 16:00 /apex/com.android.tethering/etc/bpf/test@btf.o $ adbz shell logcat -d | egrep offload.*[.]o 07-15 13:10:43.358 0 0 D LibBpfLoader: Loading critical for tethering ELF object /apex/com.android.tethering/etc/bpf/offload.o with license Apache 2.0 07-15 13:10:43.359 0 0 I LibBpfLoader: BpfLoader version 0x00019 ignoring ELF object /apex/com.android.tethering/etc/bpf/offload.o with max ver 0x00019 07-15 13:10:43.359 0 0 I bpfloader: Loaded object: /apex/com.android.tethering/etc/bpf/offload.o 07-15 13:10:43.374 0 0 D LibBpfLoader: Loading critical for tethering ELF object /apex/com.android.tethering/etc/bpf/offload@btf.o with license Apache 2.0 07-15 13:10:43.375 0 0 I LibBpfLoader: BpfLoader version 0x00019 processing ELF object /apex/com.android.tethering/etc/bpf/offload@btf.o with ver [0x00019,0x10000) 07-15 13:10:43.452 0 0 D LibBpfLoader: map_fd found at 0 is 6 in /apex/com.android.tethering/etc/bpf/offload@btf.o ... Test: TreeHugger Signed-off-by: Maciej Żenczykowski <maze@google.com> Change-Id: Id658818d1d42763358747523615b7918d312588e

2022-04-23 12:33:32 -07:00

offload.c