[PATCH 0/2] tools: bpftool: add net (un)load command to load XDP

["Daniel T. Lee" <danieltimlee@gmail.com>]

Currently, bpftool net only supports dumping progs loaded on the
interface. To load XDP prog on interface, user must use other tool
(eg. iproute2). By this patch, with `bpftool net (un)load`, user can
(un)load XDP prog on interface.

    $ ./bpftool prog
    ...
    208: xdp  name xdp_prog1  tag ad822e38b629553f  gpl
      loaded_at 2019-07-28T18:03:11+0900  uid 0
    ...
    $ ./bpftool net load id 208 xdpdrv enp6s0np1
    $ ./bpftool net
    xdp:
    enp6s0np1(5) driver id 208
    ...
    $ ./bpftool net unload xdpdrv enp6s0np1
    $ ./bpftool net
    xdp:
    ...

The word 'load' is used instead of 'attach', since XDP program is not
considered as 'bpf_attach_type' and can't be attached with
'BPF_PROG_ATTACH'. In this context, the meaning of 'load' is, prog will
be loaded on interface.

While this patch only contains support for XDP, through `net (un)load`,
bpftool can further support other prog attach types.

XDP (un)load tested on Netronome Agilio.

Daniel T. Lee (2):
  tools: bpftool: add net load command to load XDP on interface
  tools: bpftool: add net unload command to unload XDP on interface

 tools/bpf/bpftool/net.c | 160 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 159 insertions(+), 1 deletion(-)

-- 
2.20.1