add REDIRECT

hc

2024-10-09 05e59e5fb0064c97a1c10921ecd549f2d4a58565

 kernel/tools/include/uapi/linux/bpf.h
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@@ -976,7 +976,9 @@
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  * 		performed again, if the helper is used in combination with
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  * 		direct packet access.
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  * 	Return
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- * 		0 on success, or a negative error in case of failure.
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+ * 		0 on success, or a negative error in case of failure. Positive
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+ * 		error indicates a potential drop or congestion in the target
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+ * 		device. The particular positive error codes are not defined.
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  *
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  * u64 bpf_get_current_pid_tgid(void)
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  * 	Return