netdev - [PATCH v2 1/2] IB/ipoib: Use dev_port to expose network interface port numbers

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Message-Id: <20180830182238.16361-2-ar@cs.msu.ru>
Date:   Thu, 30 Aug 2018 21:22:37 +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 1/2] IB/ipoib: Use dev_port to expose network interface port numbers

Some InfiniBand network devices have multiple ports on the same PCI
function. This initializes the `dev_port' sysfs field of those
network interfaces with their port number.

Prior to this the kernel erroneously used the `dev_id' sysfs
field of those network interfaces to convey the port number to userspace.

The use of `dev_id' was considered correct until Linux 3.15,
when another field, `dev_port', was defined for this particular
purpose and `dev_id' was reserved for distinguishing stacked ifaces
(e.g: VLANs) with the same hardware address as their parent device.

Similar fixes to net/mlx4_en and many other drivers, which started
exporting this information through `dev_id' before 3.15, were accepted
into the kernel 4 years ago.
See 76a066f2a2a0 (`net/mlx4_en: Expose port number through sysfs').

Signed-off-by: Arseny Maslennikov <ar@...msu.ru>
---
 drivers/infiniband/ulp/ipoib/ipoib_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index e3d28f9ad9c0..ba16a63ee303 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1880,7 +1880,7 @@ static int ipoib_parent_init(struct net_device *ndev)
 	       sizeof(union ib_gid));

 	SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
-	priv->dev->dev_id = priv->port - 1;
+	priv->dev->dev_port = priv->port - 1;

 	return 0;
 }
-- 
2.18.0