Quentin Monnet <quentin.mon...@netronome.com> [Tue, 2018-04-17 07:36 -0700]: > Add documentation for eBPF helper functions to bpf.h user header file. > This documentation can be parsed with the Python script provided in > another commit of the patch series, in order to provide a RST document > that can later be converted into a man page. > > The objective is to make the documentation easily understandable and > accessible to all eBPF developers, including beginners. > > This patch contains descriptions for the following helper functions: > > Helpers from Lawrence: > - bpf_setsockopt() > - bpf_getsockopt() > - bpf_sock_ops_cb_flags_set() > > Helpers from Yonghong: > - bpf_perf_event_read_value() > - bpf_perf_prog_read_value() > > Helper from Josef: > - bpf_override_return() > > Helper from Andrey: > - bpf_bind() > > v3: > - bpf_perf_event_read_value(): Fix time of selection for perf event type > in description. Remove occurences of "cores" to avoid confusion with > "CPU". > - bpf_bind(): Remove last paragraph of description, which was off topic. > > Cc: Lawrence Brakmo <bra...@fb.com> > Cc: Yonghong Song <y...@fb.com> > Cc: Josef Bacik <jba...@fb.com> > Cc: Andrey Ignatov <r...@fb.com> > Signed-off-by: Quentin Monnet <quentin.mon...@netronome.com> > > fix patch 7: Yonghong and Andrey > --- > include/uapi/linux/bpf.h | 178 > +++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 178 insertions(+) > > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h > index dd79a1c82adf..350459c583de 100644 > --- a/include/uapi/linux/bpf.h > +++ b/include/uapi/linux/bpf.h > + * > + * int bpf_bind(struct bpf_sock_addr_kern *ctx, struct sockaddr *addr, int > addr_len) > + * Description > + * Bind the socket associated to *ctx* to the address pointed by > + * *addr*, of length *addr_len*. This allows for making outgoing > + * connection from the desired IP address, which can be useful for > + * example when all processes inside a cgroup should use one > + * single IP address on a host that has multiple IP configured. > + * > + * This helper works for IPv4 and IPv6, TCP and UDP sockets. The > + * domain (*addr*\ **->sa_family**) must be **AF_INET** (or > + * **AF_INET6**). Looking for a free port to bind to can be > + * expensive, therefore binding to port is not permitted by the > + * helper: *addr*\ **->sin_port** (or **sin6_port**, respectively) > + * must be set to zero. > + * Return > + * 0 on success, or a negative error in case of failure.
Acked-by: Andrey Ignatov <r...@fb.com> for bpf_bind() helper. -- Andrey Ignatov
