On the system where I have installed the 4.15.xxx kernel and usbip from
Debian/sid, I get the following results from "usbip --debug port":

usbip: debug: names.c:428:[parse] line 18068 subclass fe:02 IRDA Bridge
usbip: debug: names.c:428:[parse] line 18069 subclass fe:03 Test and
usbip: debug: names.c:461:[parse] line 18070 protocol fe:03:01 TMC
usbip: debug: names.c:461:[parse] line 18071 protocol fe:03:02 USB488
usbip: debug: names.c:374:[parse] line 18072 class ff Vendor Specific Class
usbip: debug: names.c:428:[parse] line 18073 subclass ff:ff Vendor
Specific Subclass
usbip: debug: names.c:461:[parse] line 18074 protocol ff:ff:ff Vendor
Specific Protocol
libusbip: debug: vhci_driver.c:264:[usbip_vhci_driver_open] available
ports: 240
libusbip: error: port number exceeds 128
usbip: error: open vhci_driver
usbip: error: list imported devices

The line where the condition is checked is

<https://elixir.bootlin.com/linux/v4.15.4/ident/vhci_driver>->nports = 
get_nports <https://elixir.bootlin.com/linux/v4.15.4/ident/get_nports>();
        dbg <https://elixir.bootlin.com/linux/v4.15.4/ident/dbg>("available
ports: %d", vhci_driver

        if (vhci_driver
<https://elixir.bootlin.com/linux/v4.15.4/ident/vhci_driver>->nports <= 0) {
                err("no available ports");
                goto err;
        } else if (vhci_driver
<https://elixir.bootlin.com/linux/v4.15.4/ident/vhci_driver>->nports > MAXNPORT 
<https://elixir.bootlin.com/linux/v4.15.4/ident/MAXNPORT>) {
                err("port number exceeds %d", MAXNPORT 
                goto err;

Maybe the viable workaround would be just to increase the MAXNPORT number?


Wojciech M Zabolotny, PhD
Institute of Electronic Systems
Faculty of Electronics and Information Technology
Warsaw University of Technology

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