Hi Daniel,

Thanks for the last reply about the testing of eBPF JIT.

I have one issue though, I am not able to find what BPF_ABS and
BPF_IND instruction does exactly. It not described on this link -
https://www.kernel.org/doc/Documentation/networking/filter.txt either.
Can you please tell me where I could find the description of these
instructions please?
Best,
Shubham Bansal


On Thu, Apr 6, 2017 at 6:21 PM, Daniel Borkmann [off-list ref] wrote:

On 04/06/2017 01:05 PM, Shubham Bansal wrote:

quoted

Gentle Reminder.

Sorry for late reply.

quoted

Anybody can tell me how to test the JIT compiler ?

There's lib/test_bpf.c, see Documentation/networking/filter.txt +1349
for some more information. It basically contains various test cases that
have the purpose to test the JIT with corner cases. If you see a useful
test missing, please send a patch for it, so all other JITs can benefit
from this as well. For extracting disassembly from a generated test case,
check out bpf_jit_disasm (Documentation/networking/filter.txt +486).

Thanks,
Daniel