netdev - [PATCH bpf-next v2 0/8] bpf: offload: report device back to user space (take 2)

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Message-Id: <20171221210120.30166-1-jakub.kicinski@netronome.com>
Date:   Thu, 21 Dec 2017 13:01:12 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     netdev@...r.kernel.org, alexei.starovoitov@...il.com,
        daniel@...earbox.net
Cc:     ktkhai@...tuozzo.com, oss-drivers@...ronome.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH bpf-next v2 0/8] bpf: offload: report device back to user space (take 2)

Hi!

This series is a redo of reporting offload device information to
user space after the first attempt did not take into account name
spaces.  As requested by Kirill offloads are now protected by an
r/w sem.  This allows us to remove the workqueue and free the
offload state fully when device is removed (suggested by Alexei).

Net namespace is reported with a device/inode pair.

The accompanying bpftool support is placed in common code because
maps will have very similar info.  Note that the UAPI information
can't be nicely encapsulated into a struct, because in case we
need to grow the device information the new fields will have to
be added at the end of struct bpf_prog_info, we can't grow
structures in the middle of bpf_prog_info.

v2:
 - rework the locking in patch 1 (use RCU instead of locking
   dependencies);
 - grab RTNL for a short time in patch 6;
 - minor update to the test in patch 8.

Jakub Kicinski (8):
  bpf: offload: don't require rtnl for dev list manipulation
  bpf: offload: don't use prog->aux->offload as boolean
  bpf: offload: allow netdev to disappear while verifier is running
  bpf: offload: free prog->aux->offload when device disappears
  bpf: offload: free program id when device disappears
  bpf: offload: report device information for offloaded programs
  tools: bpftool: report device information for offloaded programs
  selftests/bpf: test device info reporting for bound progs

 drivers/net/ethernet/netronome/nfp/bpf/main.h     |   2 +-
 drivers/net/ethernet/netronome/nfp/bpf/verifier.c |   2 +-
 drivers/net/netdevsim/bpf.c                       |   2 +-
 fs/nsfs.c                                         |   2 +-
 include/linux/bpf.h                               |  16 ++-
 include/linux/bpf_verifier.h                      |  16 +--
 include/linux/netdevice.h                         |   4 +-
 include/linux/proc_ns.h                           |   1 +
 include/uapi/linux/bpf.h                          |   3 +
 kernel/bpf/offload.c                              | 133 ++++++++++++++++------
 kernel/bpf/syscall.c                              |  19 +++-
 kernel/bpf/verifier.c                             |  20 ++--
 tools/bpf/bpftool/common.c                        |  52 +++++++++
 tools/bpf/bpftool/main.h                          |   2 +
 tools/bpf/bpftool/prog.c                          |   3 +
 tools/include/uapi/linux/bpf.h                    |   3 +
 tools/testing/selftests/bpf/test_offload.py       | 112 ++++++++++++++++--
 17 files changed, 308 insertions(+), 84 deletions(-)

-- 
2.15.1