netdev - [PATCH v2 0/2] IB/ipoib: Use dev_port to disambiguate port numbers

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Message-Id: <20180830182238.16361-1-ar@cs.msu.ru>
Date:   Thu, 30 Aug 2018 21:22:36 +0300
From:   Arseny Maslennikov <ar@...msu.ru>
To:     linux-rdma@...r.kernel.org
Cc:     Arseny Maslennikov <ar@...msu.ru>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, netdev@...r.kernel.org
Subject: [PATCH v2 0/2] IB/ipoib: Use dev_port to disambiguate port numbers

Pre-3.15 userspace had trouble distinguishing different ports
of a NIC on a single PCI bus/device/function. To solve this,
a sysfs field `dev_port' was introduced quite a while ago
(commit v3.14-rc3-739-g3f85944fe207), and some relevant device
drivers were fixed to use it, but not in case of IPoIB.

The convention for some reason never got documented in the kernel, but
was immediately adopted by userspace (notably udev[1][2], biosdevname[3])

3/3 documents the sysfs field — that's why I'm CC-ing netdev.

This series was tested on and applies to 4.19-rc1.

[1] https://lists.freedesktop.org/archives/systemd-devel/2014-June/020788.html
[2] https://lists.freedesktop.org/archives/systemd-devel/2014-July/020804.html
[3] https://github.com/CloudAutomationNTools/biosdevname/blob/c795d51dd93a5309652f0d635f12a3ecfabfaa72/src/eths.c#L38

v1->v2: replace a line instead of inserting and then removing.

Arseny Maslennikov (2):
  IB/ipoib: Use dev_port to expose network interface port numbers
  Documentation/ABI: document /sys/class/net/*/dev_port

 Documentation/ABI/testing/sysfs-class-net | 10 ++++++++++
 drivers/infiniband/ulp/ipoib/ipoib_main.c |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

-- 
2.18.0