lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Sun, 11 Aug 2019 17:31:53 +0200 From: Andrew Lunn <andrew@...n.ch> To: Marek BehĂșn <marek.behun@....cz> Cc: netdev@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>, Sebastian Reichel <sebastian.reichel@...labora.co.uk>, Vivien Didelot <vivien.didelot@...il.com>, Florian Fainelli <f.fainelli@...il.com>, "David S . Miller" <davem@...emloft.net> Subject: Re: [PATCH net-next 1/2] net: dsa: mv88e6xxx: fix RGMII-ID port setup On Sun, Aug 11, 2019 at 05:08:11PM +0200, Marek BehĂșn wrote: > The mv88e6xxx_port_setup_mac looks if one of the {link, speed, duplex} > parameters is being changed from the current setting, and if not, does > not do anything. This test is wrong in some situations: this method also > has the mode argument, which can also be changed. > > For example on Turris Omnia, the mode is PHY_INTERFACE_MODE_RGMII_ID, > which has to be set byt the ->port_set_rgmii_delay method. The test does > not look if mode is being changed (in fact there is currently no method > to determine port mode as phy_interface_t type). > > The simplest solution seems to be to drop this test altogether and > simply do the setup when requested. Hi Marek Unfortunately, that code is there for a reason. phylink can call the ->mac_config() method once per second. It is documented that mac_config() should only reconfigure what, if anything, has changed. And mv88e6xxx_port_setup_mac() needs to disable the port in order to change anything. So the change you propose here, under some conditions, will cause the port to be disabled/enables once per second. We need to fix this by expanding the test, not removing it. My current _guess_ would be, we need to add a ops->port_get_rgmii_delay() so we can see if that is what needs configuring. Andrew
Powered by blists - more mailing lists