From 5df5661a1387e829c901d009cdd1fccc376cdb74 Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Thu, 23 Jul 2020 01:43:12 +0300 Subject: net: dsa: stop overriding master's ndo_get_phys_port_name The purpose of this override is to give the user an indication of what the number of the CPU port is (in DSA, the CPU port is a hardware implementation detail and not a network interface capable of traffic). However, it has always failed (by design) at providing this information to the user in a reliable fashion. Prior to commit 3369afba1e46 ("net: Call into DSA netdevice_ops wrappers"), the behavior was to only override this callback if it was not provided by the DSA master. That was its first failure: if the DSA master itself was a DSA port or a switchdev, then the user would not see the number of the CPU port in /sys/class/net/eth0/phys_port_name, but the number of the DSA master port within its respective physical switch. But that was actually ok in a way. The commit mentioned above changed that behavior, and now overrides the master's ndo_get_phys_port_name unconditionally. That comes with problems of its own, which are worse in a way. The idea is that it's typical for switchdev users to have udev rules for consistent interface naming. These are based, among other things, on the phys_port_name attribute. If we let the DSA switch at the bottom to start randomly overriding ndo_get_phys_port_name with its own CPU port, we basically lose any predictability in interface naming, or even uniqueness, for that matter. So, there are reasons to let DSA override the master's callback (to provide a consistent interface, a number which has a clear meaning and must not be interpreted according to context), and there are reasons to not let DSA override it (it breaks udev matching for the DSA master). But, there is an alternative method for users to retrieve the number of the CPU port of each DSA switch in the system: $ devlink port pci/0000:00:00.5/0: type eth netdev swp0 flavour physical port 0 pci/0000:00:00.5/2: type eth netdev swp2 flavour physical port 2 pci/0000:00:00.5/4: type notset flavour cpu port 4 spi/spi2.0/0: type eth netdev sw0p0 flavour physical port 0 spi/spi2.0/1: type eth netdev sw0p1 flavour physical port 1 spi/spi2.0/2: type eth netdev sw0p2 flavour physical port 2 spi/spi2.0/4: type notset flavour cpu port 4 spi/spi2.1/0: type eth netdev sw1p0 flavour physical port 0 spi/spi2.1/1: type eth netdev sw1p1 flavour physical port 1 spi/spi2.1/2: type eth netdev sw1p2 flavour physical port 2 spi/spi2.1/3: type eth netdev sw1p3 flavour physical port 3 spi/spi2.1/4: type notset flavour cpu port 4 So remove this duplicated, unreliable and troublesome method. From this patch on, the phys_port_name attribute of the DSA master will only contain information about itself (if at all). If the users need reliable information about the CPU port they're probably using devlink anyway. Signed-off-by: Vladimir Oltean Acked-by: florian Fainelli Signed-off-by: David S. Miller --- net/core/dev.c | 5 ----- net/dsa/master.c | 12 ------------ 2 files changed, 17 deletions(-) (limited to 'net') diff --git a/net/core/dev.c b/net/core/dev.c index 316349f6cea5..a986b07ea845 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -98,7 +98,6 @@ #include #include #include -#include #include #include #include @@ -8605,10 +8604,6 @@ int dev_get_phys_port_name(struct net_device *dev, const struct net_device_ops *ops = dev->netdev_ops; int err; - err = dsa_ndo_get_phys_port_name(dev, name, len); - if (err == 0 || err != -EOPNOTSUPP) - return err; - if (ops->ndo_get_phys_port_name) { err = ops->ndo_get_phys_port_name(dev, name, len); if (err != -EOPNOTSUPP) diff --git a/net/dsa/master.c b/net/dsa/master.c index 0a90911ae31b..61615ebc70e9 100644 --- a/net/dsa/master.c +++ b/net/dsa/master.c @@ -186,17 +186,6 @@ static void dsa_master_get_strings(struct net_device *dev, uint32_t stringset, } } -static int dsa_master_get_phys_port_name(struct net_device *dev, - char *name, size_t len) -{ - struct dsa_port *cpu_dp = dev->dsa_ptr; - - if (snprintf(name, len, "p%d", cpu_dp->index) >= len) - return -EINVAL; - - return 0; -} - static int dsa_master_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { struct dsa_port *cpu_dp = dev->dsa_ptr; @@ -228,7 +217,6 @@ static int dsa_master_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) static const struct dsa_netdevice_ops dsa_netdev_ops = { .ndo_do_ioctl = dsa_master_ioctl, - .ndo_get_phys_port_name = dsa_master_get_phys_port_name, }; static int dsa_master_ethtool_setup(struct net_device *dev) -- cgit v1.2.3