On Fri, 1 Feb 2019 22:23:45 +0100
Daniel Borkmann [off-list ref] wrote:

On 02/01/2019 01:19 AM, Maciej Fijalkowski wrote:

quoted

Hi!
This patchset tries to address the situation where:
* user loads a particular xdp sample application that does stats polling
* user loads another sample application on the same interface
* then, user sends SIGINT/SIGTERM to the app that was attached as a first
one
* second application ends up with an unloaded xdp program

1st patch contains a helper libbpf function for getting the map fd by a
given map name.
In patch 2 Jesper removes the read_trace_pipe usage from xdp_redirect_cpu
which was a blocker for converting this sample to libbpf usage.
3rd patch updates a bunch of xdp samples to make the use of libbpf.
Patch 4 adjusts RLIMIT_MEMLOCK for two samples touched in this patchset.
In patch 5 extack messages are added for cases where dev_change_xdp_fd
returns with an error so user has an idea what was the reason for not
attaching the xdp program onto interface.
Patch 6 makes the samples behavior similar to what iproute2 does when
loading xdp prog - the "force" flag is introduced.
Patch 7 introduces the libbpf function that will query the driver from
userspace about the currently attached xdp prog id.

Use it in samples that do polling by checking the prog id in signal handler
and comparing it with previously stored one which is the scope of patch 8.

Thanks!

v1->v2:
* add a libbpf helper for getting a prog via relative index
* include xdp_redirect_cpu into conversion

v2->v3: mostly addressing Daniel's/Jesper's comments
* get rid of the helper from v1->v2
* feed the xdp_redirect_cpu with program name instead of number

v3->v4:
* fix help message in xdp_sample_pkts

v4->v5:
* in get_link_xdp_fd, assign prog_id only when libbpf_nl_get_link returned
  with 0
* add extack messages in dev_change_xdp_fd
* check the return value of bpf_get_link_xdp_id when exiting from sample
progs

Series looks good to me, but doesn't apply cleanly, please rebase.

Thanks,
Daniel

Sure, sending v6 in a minute.