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Function msg_verify_data should have context of bytes_cnt and k instead of assuming they are zero. Otherwise, test_sockmap with data integrity test will report some errors. I also fix the logic related to size and index j 1/ 6 sockmap::txmsg test passthrough:FAIL 2/ 6 sockmap::txmsg test redirect:FAIL 7/12 sockmap::txmsg test apply:FAIL 10/11 sockmap::txmsg test push_data:FAIL 11/17 sockmap::txmsg test pull-data:FAIL 12/ 9 sockmap::txmsg test pop-data:FAIL 13/ 1 sockmap::txmsg test push/pop data:FAIL ... Pass: 24 Fail: 52 After applying this patch, some of the errors are solved, but for push, pull and pop, we may need more fixes to msg_verify_data, added a TODO 10/11 sockmap::txmsg test push_data:FAIL 11/17 sockmap::txmsg test pull-data:FAIL 12/ 9 sockmap::txmsg test pop-data:FAIL ... Pass: 37 Fail: 15 Besides, added a custom errno EDATAINTEGRITY for msg_verify_data, we shall not ignore the error in txmsg_cork case. Fixes:753fb2ee09("bpf: sockmap, add msg_peek tests to test_sockmap") Fixes:16edddfe3c("selftests/bpf: test_sockmap, check test failure") Acked-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Zijian Zhang <zijianzhang@bytedance.com> Link: https://lore.kernel.org/r/20241012203731.1248619-2-zijianzhang@bytedance.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>