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RDMA/ipoib: Allow user space differentiate between valid dev_port

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Systemd triggers the following warning during IPoIB device load:

 mlx5_core 0000:00:0c.0 ib0: "systemd-udevd" wants to know my dev_id.
        Should it look at dev_port instead?
        See Documentation/ABI/testing/sysfs-class-net for more info.

This is caused due to user space attempt to differentiate old systems
without dev_port and new systems with dev_port. In case dev_port will be
zero, the systemd will try to read dev_id instead.

There is no need to print a warning in such case, because it is valid
situation and it is needed to ensure systemd compatibility with old
kernels.

Link: https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
Cc: <stable@vger.kernel.org> # 4.19
Fixes: f6350da41d ("IB/ipoib: Log sysfs 'dev_id' accesses from userspace")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Leon Romanovsky 2019-05-06 14:23:04 +03:00 committed by Jason Gunthorpe
parent ba7d8117f3
commit b79656ed44
1 changed files with 12 additions and 1 deletions
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13
drivers/infiniband/ulp/ipoib/ipoib_main.c
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@ -2402,7 +2402,18 @@ static ssize_t dev_id_show(struct device *dev,
{
struct net_device *ndev = to_net_dev(dev);
if (ndev->dev_id == ndev->dev_port)
/*
* ndev->dev_port will be equal to 0 in old kernel prior to commit
* 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
* port numbers") Zero was chosen as special case for user space
* applications to fallback and query dev_id to check if it has
* different value or not.
*
* Don't print warning in such scenario.
*
* https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
*/
if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
netdev_info_once(ndev,
"\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n",
current->comm);