On Wed, Sep 05, 2018 at 04:50:35PM +0300, Leon Romanovsky wrote: > On Mon, Sep 03, 2018 at 07:13:16PM +0300, Arseny Maslennikov wrote: > > Signed-off-by: Arseny Maslennikov <ar@xxxxxxxxx> > > --- > > drivers/infiniband/ulp/ipoib/ipoib_main.c | 38 +++++++++++++++++++++++ > > 1 file changed, 38 insertions(+) > > > > diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c > > index 30f840f874b3..7386e5bde3d3 100644 > > --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c > > +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c > > @@ -2386,6 +2386,42 @@ 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); > > + ssize_t ret = -EINVAL; > > + > > + 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?\n", > > + current->comm); > > + netdev_info_once(ndev, > > + "See Documentation/ABI/testing/sysfs-class-net for more info.\n"); > > + } > > + > > + ret = sprintf(buf, "%#x\n", ndev->dev_id); > > + > > + return ret; > > +} > > +static DEVICE_ATTR_RO(dev_id); > > + > > I don't see this field among exposed by IPoIB, why should we expose it now? > To deviate from standard netdev behaviour, which only prints the field out. Doug wanted this to also print a deprecation message, and netdev (obviously) does not do that. See below. > > +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); > > Why isn't enough to rely on netdev code? > Netdev code relies on macros around a *static* function 'netdev_show', which is defined in net/core/net-sysfs.c; it is not listed in any header files, and the macros aren't as well. This all leads me to believe it was not really meant to be used from outside net/core/net-sysfs. The only way we could use any netdev code here is to set up our own handler (again), printk() a message, then call netdev_show — but we have no access to it. Of course, it also may be that I'm terribly missing a clue. > > +} > > + > > static struct net_device *ipoib_add_port(const char *format, > > struct ib_device *hca, u8 port) > > { > > @@ -2427,6 +2463,8 @@ 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)) > > -- > > 2.19.0.rc1 > >
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