man: ifpps: Mention CPU limit in first section and remove BUGS section

Mention the -n command line option in the general description, not just
the hard limit. Also remove the BUGS section, since this is now
basically resolved.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
ring: implement setup of tpacket v3 ring

Implement ring setup routines and structures for TPACKET_V3.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
ring: fix wrong error message text in __get_sockopt_tpacket

Arg, this was a leftover when copying the other function. So fix it!

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>