Mon, Feb 01, 2021 at 02:41:07PM CET, and...@lunn.ch wrote: >On Mon, Feb 01, 2021 at 09:16:41AM +0100, Jiri Pirko wrote: >> Sun, Jan 31, 2021 at 06:09:24PM CET, dsah...@gmail.com wrote: >> >On 1/30/21 7:19 AM, Jiri Pirko wrote: >> >> Fri, Jan 29, 2021 at 06:31:59PM CET, and...@lunn.ch wrote: >> >>>> Platform line card driver is aware of line card I2C topology, its >> >>>> responsibility is to detect line card basic hardware type, create I2C >> >>>> topology (mux), connect all the necessary I2C devices, like hotswap >> >>>> devices, voltage and power regulators devices, iio/a2d devices and line >> >>>> card EEPROMs, creates LED instances for LED located on a line card, >> >>>> exposes >> >>>> line card related attributes, like CPLD and FPGA versions, reset causes, >> >>>> required powered through line card hwmon interface. >> >>> >> >>> So this driver, and the switch driver need to talk to each other, so >> >>> the switch driver actually knows what, if anything, is in the slot. >> >> >> >> Not possible in case the BMC is a different host, which is common >> >> scenario. >> >> >> > >> >User provisions a 4 port card, but a 2 port card is inserted. How is >> >this detected and the user told the wrong card is inserted? >> >> The card won't get activated. >> The user won't see the type of inserted linecard. Again, it is not >> possible for ASIC to access the linecard eeprom. See Vadim's reply. >> >> >> > >> >If it is not detected that's a serious problem, no? >> >> That is how it is, unfortunatelly. >> >> >> > >> >If it is detected why can't the same mechanism be used for auto >> >provisioning? >> >> Again, not possible to detect. > >If the platform line card driver is running in the host, you can >detect it. From your wording, it sounds like some systems do have this >driver in the host. So please add the needed code.
But if not, it cannot. We still need the provisioning then. > >When the platform line card driver is on the BMC, you need a proxy in >between. Isn't this what IPMI and Redfish is all about? The proxy >driver can offer the same interface as the platform line card driver. Do you have any example of kernel driver which is doing some thing like that? > > Andrew
