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IB/ipoib: Log sysfs 'dev_id' accesses from userspace

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Some tools may currently be using only the deprecated attribute;
let's print an elaborate and clear deprecation notice to kmsg.

To do that, we have to replace the whole sysfs file, since we inherit
the original one from netdev.

Signed-off-by: Arseny Maslennikov <ar@cs.msu.ru>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Arseny Maslennikov 2018-09-06 17:51:12 +03:00 committed by Doug Ledford
parent 9b8b2a3230
commit f6350da41d
1 changed files with 31 additions and 0 deletions
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31
drivers/infiniband/ulp/ipoib/ipoib_main.c
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@ -2387,6 +2387,35 @@ int ipoib_add_pkey_attr(struct net_device *dev)
return device_create_file(&dev->dev, &dev_attr_pkey);
}
/*
* We erroneously exposed the iface's port number in the dev_id
* sysfs field long after dev_port was introduced for that purpose[1],
* and we need to stop everyone from relying on that.
* Let's overload the shower routine for the dev_id file here
* to gently bring the issue up.
*
* [1] https://www.spinics.net/lists/netdev/msg272123.html
*/
static ssize_t dev_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct net_device *ndev = to_net_dev(dev);
if (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);
return sprintf(buf, "%#x\n", ndev->dev_id);
}
static DEVICE_ATTR_RO(dev_id);
int ipoib_intercept_dev_id_attr(struct net_device *dev)
{
device_remove_file(&dev->dev, &dev_attr_dev_id);
return device_create_file(&dev->dev, &dev_attr_dev_id);
}
static struct net_device *ipoib_add_port(const char *format,
struct ib_device *hca, u8 port)
{
@ -2428,6 +2457,8 @@ static struct net_device *ipoib_add_port(const char *format,
*/
ndev->priv_destructor = ipoib_intf_free;
if (ipoib_intercept_dev_id_attr(ndev))
goto sysfs_failed;
if (ipoib_cm_add_mode_attr(ndev))
goto sysfs_failed;
if (ipoib_add_pkey_attr(ndev))