[PATCH net-next 00/12] net: sched: propagate extack to cls offloads on destroy and only with skip_sw

[Jakub Kicinski]

Hi!

This series some of Jiri's comments and the fact that today drivers
may produce extack even if there is no skip_sw flag (meaning the
driver failure is not really a problem), and warning messages will
only confuse the users.

First patch propagates extack to destroy as requested by Jiri, extack
is then propagated to the driver callback for each classifier.  I chose
not to provide the extack on error paths.  As a rule of thumb it seems
best to keep the extack of the condition which caused the error.  E.g.

     err = this_will_fail(arg, extack);
     if (err) {
        undo_things(arg, NULL /* don't pass extack */);
        return err;
     }

Note that NL_SET_ERR_MSG() will ignore the message if extack is NULL.
I was pondering whether we should make NL_SET_ERR_MSG() refuse to
overwrite the msg, but there seem to be cases in the tree where extack
is set like this:

     err = this_will_fail(arg, extack);
     if (err) {
        undo_things(arg, NULL /* don't pass extack */);
        NL_SET_ERR_MSG(extack, "extack is set after undo call :/");
        return err;
     }

I think not passing extack to undo calls is reasonable.

Jakub Kicinski (12):
  net: sched: propagate extack to cls->destroy callbacks
  net: sched: prepare for reimplementation of
    tc_cls_common_offload_init()
  cls_bpf: remove gen_flags from bpf_offload
  cls_bpf: pass offload flags to tc_cls_common_offload_init()
  cls_bpf: propagate extack to offload delete callback
  cls_matchall: pass offload flags to tc_cls_common_offload_init()
  cls_matchall: propagate extack to delete callback
  cls_flower: pass offload flags to tc_cls_common_offload_init()
  cls_flower: propagate extack to delete callback
  cls_u32: pass offload flags to tc_cls_common_offload_init()
  cls_u32: propagate extack to delete callback
  net: sched: remove tc_cls_common_offload_init__()

 include/net/pkt_cls.h     | 24 ++++++++++++------------
 include/net/sch_generic.h |  3 ++-
 net/sched/cls_api.c       | 15 ++++++++-------
 net/sched/cls_basic.c     |  2 +-
 net/sched/cls_bpf.c       | 24 +++++++++++++-----------
 net/sched/cls_cgroup.c    |  3 ++-
 net/sched/cls_flow.c      |  2 +-
 net/sched/cls_flower.c    | 24 +++++++++++++-----------
 net/sched/cls_fw.c        |  2 +-
 net/sched/cls_matchall.c  | 13 +++++++------
 net/sched/cls_route.c     |  2 +-
 net/sched/cls_rsvp.h      |  2 +-
 net/sched/cls_tcindex.c   |  3 ++-
 net/sched/cls_u32.c       | 42 ++++++++++++++++++++++++------------------
 14 files changed, 88 insertions(+), 73 deletions(-)

-- 
2.15.1