netdev - [PATCH bpf-next 0/3] add size field to sk_msg

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Date:   Sun, 16 Dec 2018 15:47:03 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     daniel@...earbox.net, ast@...nel.org
Cc:     netdev@...r.kernel.org, john.fastabend@...il.com
Subject: [PATCH bpf-next 0/3] add size field to sk_msg_md

This adds a size field to the sk_msg_md data structure used by SK_MSG
programs. Without this in the zerocopy case and in the copy case
where multiple iovs are in use its difficult to know how much data
can be pulled in. The normal method of reading data and data_end
only give the current contiguous buffer. BPF programs can attempt to
pull in extra data but have to guess if it exists. This can result
in multiple "guesses" its much better if we know upfront the size
of the sk_msg.

John Fastabend (3):
  bpf: sockmap, metadata support for reporting length of message
  bpf: add tools lib/include support sk_msg_md size field
  bpf: sk_msg, add tests for size field

 include/linux/skmsg.h                       |  3 +++
 include/uapi/linux/bpf.h                    |  1 +
 net/core/filter.c                           |  6 ++++++
 tools/include/uapi/linux/bpf.h              |  1 +
 tools/testing/selftests/bpf/test_verifier.c | 16 +++++++++++++---
 5 files changed, 24 insertions(+), 3 deletions(-)

-- 
2.7.4