Hi Everyone, Seeking advice please on: if it was possible to run multiple USB devices within the same Linux system in device mode and use g_mass_storage to emulate different "volumes" through each. This is how far I got: - Have two USB3380-EVB boards hooked up in a Linux machine (x86) - I see both of them via `lspci`, net2280 module runs them. # lspci -nn |grep 3380 04:00.0 USB controller [0c03]: PLX Technology, Inc. Device [10b5:3380] (rev ab) 65:00.0 USB controller [0c03]: PLX Technology, Inc. Device [10b5:3380] (rev ab) - Loading the `g_mass_storage` to allow me to "insert" an image to to emulate: # modprobe g_mass_storage removable=y stall=0 nofua=1 # find /sys/ -name "*gadget*" [...] /sys/devices/pci0000:64/0000:64:00.0/0000:65:00.0/gadget /sys/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/gadget - But when I look at sysfs, only one of them has `lun0/file` that I can echo into: # ls -1 /sys/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/gadget lun0 <--- lun0 is here, looks good power suspended uevent # ls -1 /sys/devices/pci0000:64/0000:64:00.0/0000:65:00.0/gadget power uevent <-- lun0 is missing :( - The following works for one image, but I am trying to insert an another image to through the other controller: echo "/home/test.img" > /sys/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/gadget/lun0/file In the kernel documentation I found the following in the USB Controller Driver section: "The controller driver can support any number of different gadget drivers, but only one of them can be used at a time." It was not clear whether it means one driver at a time or one controller at a time. (https://www.kernel.org/doc/html/latest/driver-api/usb/gadget.html) Questions please: - Is there something I missed or oversee? - Would you have any suggestions how to make it work? Is it possible? - Any advice on cards I could use in x86 machines other than this? I haven't found any other than the 3380, which is end of life now. Really appreciate advice and direction. Regards, Arpad
