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18 The ``BPF_PROG_RUN`` command can be used through the ``bpf()`` syscall to
20 can be used to unit test BPF programs against user-supplied context objects, and
23 to be defined in the UAPI header, aliased to the same value.
25 The ``BPF_PROG_RUN`` command can be used to execute BPF programs of the
48 will not actually be redirected or dropped, the program return code will just be
56 which can be used to execute XDP programs in a way where packets will actually
57 be processed by the kernel after the execution of the XDP program as if they
68 will not be returned to userspace; instead, the kernel will perform the
71 in the syscall parameters when running in this mode will be rejected. In
72 addition, not all failures will be reported back to userspace directly;
76 execution will continue with the next repetition; these errors can be detected
80 the regular (non-live) mode. The XDP program will be executed as though the
83 ``XDP_PASS``, the packet will be injected into the kernel networking stack as
85 will be transmitted *out* of that same interface. Do note, though, that
93 maximum NAPI receive batch size), but can be specified by userspace through
102 pages of the same size as the batch size. Each memory page will be initialised
104 invocation. When possible, the pages will be recycled on future program
105 invocations, to improve performance. Pages will generally be recycled a full
107 of, say, a redirection error), in which case that page will be recycled
110 redirected to an interface that injects it into the stack), the page will be
111 released and a new one will be allocated when the pool is empty.
115 be reset to the original values. This means that if a program rewrites the
116 packet contents, it has to be prepared to see either the original content or