linux-kernel - [PATCH bpf-next 0/3] writable contexts for bpf raw tracepoints

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Message-ID: <20190329000758.494762-1-mmullins@fb.com>
Date:   Thu, 28 Mar 2019 17:07:55 -0700
From:   Matt Mullins <mmullins@...com>
To:     <hall@...com>, <mmullins@...com>, <ast@...nel.org>,
        <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>
Subject: [PATCH bpf-next 0/3] writable contexts for bpf raw tracepoints

This adds an opt-in interface for tracepoints to expose a writable context to
BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE programs that are attached, while
supporting read-only access from existing BPF_PROG_TYPE_RAW_TRACEPOINT
programs, as well as from non-BPF-based tracepoints.

The initial motivation is to support tracing that can be observed from the
remote end of an NBD socket, e.g. by adding flags to the struct nbd_request
header.  Earlier attempts included adding an NBD-specific tracepoint fd, but in
code review, I was recommended to implement it more generically -- as a result,
this patchset is far simpler than my initial try.

Andrew Hall (1):
  nbd: add tracepoints for send/receive timing

Matt Mullins (2):
  bpf: add writable context for raw tracepoints
  nbd: trace sending nbd requests

 MAINTAINERS                     |   1 +
 drivers/block/nbd.c             |  13 +++
 include/linux/bpf.h             |   2 +
 include/linux/bpf_types.h       |   1 +
 include/linux/tracepoint-defs.h |   1 +
 include/trace/bpf_probe.h       |  27 +++++-
 include/trace/events/nbd.h      | 148 ++++++++++++++++++++++++++++++++
 include/uapi/linux/bpf.h        |   1 +
 kernel/bpf/syscall.c            |   8 +-
 kernel/bpf/verifier.c           |  11 +++
 kernel/trace/bpf_trace.c        |  21 +++++
 11 files changed, 230 insertions(+), 4 deletions(-)
 create mode 100644 include/trace/events/nbd.h

-- 
2.17.1