Hi Anton, Thank you for your report! I'll take a look on it ASAP. Regards, Oleksij On Wed, Jun 22, 2022 at 04:16:38PM +0200, Anton Lundin wrote: > Hi. > > I've found a issue with a Dlink usb ether adapter, that can't receive > anything until it self transmits if it's plugged in while booting, and > doesn't have link. > > Later when a cable is attached, link is detected but nothing is received > either by daemons listening to ip address on that interface, or seen > with tcpdump. > > The dongle is a: > D-Link Corp. DUB-E100 Fast Ethernet Adapter(rev.C1) [ASIX AX88772] > > And it's detected at boot as: > libphy: Asix MDIO Bus: probed > Asix Electronics AX88772C usb-003:004:10: attached PHY driver (mii_bus:phy_addr=usb-003:004:10, irq=POLL) > asix 3-10.4:1.0 eth1: register 'asix' at usb-0000:00:14.0-10.4, ASIX AX88772 USB 2.0 Ethernet, <masked-mac> > usbcore: registered new interface driver asix > > > While in this state, the hardware starts sending pause frames to the > network when it has recived a couple of frames, and they look like: > 0000 01 80 c2 00 00 01 00 00 00 00 00 00 88 08 00 01 > 0010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 0020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 0030 00 00 00 00 00 00 00 00 00 00 00 00 > > 0000 01 80 c2 00 00 01 00 00 00 00 00 00 88 08 00 01 > 0010 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 0020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 0030 00 00 00 00 00 00 00 00 00 00 00 00 > > And these two frames are repeated every couple of seconds. > > The card wakes up when something triggers a transmit on that card, and > then starts receiving traffic as normal. > > I've bisected this issue down to: > "net: usb: asix: ax88772: add phylib support" (e532a096be0e) > > > Reverting that makes the interface work as normal, even if the machine > boots without a cable plugged in. > > Another issue found with exactly the same patch is that if it's loaded > as a module, then unloaded and loaded again, it fails to initialize the > card with: > > sysfs: cannot create duplicate filename '/devices/virtual/mdio_bus/usb-003:004' > CPU: 0 PID: 3733 Comm: modprobe Tainted: G O 5.15.10-core_64_preempt #3 > Hardware name: <masked-hardware-name> > Call Trace: > <TASK> > ? dump_stack_lvl+0x34/0x44 > ? sysfs_warn_dup.cold+0x17/0x24 > ? sysfs_create_dir_ns+0xbc/0xd0 > ? kobject_add_internal+0xa6/0x260 > ? kobject_add+0x7e/0xb0 > ? preempt_count_add+0x68/0xa0 > ? device_add+0x10f/0x8d0 > ? dev_set_name+0x53/0x70 > ? __mdiobus_register+0xc2/0x350 > ? __devm_mdiobus_register+0x64/0xb0 > ? ax88772_bind+0x22a/0x340 [asix] > ? usbnet_probe+0x346/0x870 > ? usb_match_dynamic_id+0x8f/0xa0 > ? usb_probe_interface+0x9b/0x150 > ? really_probe.part.0+0x237/0x280 > ? __driver_probe_device+0x8c/0xd0 > ? driver_probe_device+0x1e/0xe0 > ? __driver_attach+0xa8/0x170 > ? __device_attach_driver+0xe0/0xe0 > ? bus_for_each_dev+0x77/0xc0 > ? bus_add_driver+0x10b/0x1c0 > ? driver_register+0x8b/0xe0 > ? usb_register_driver+0x84/0x120 > ? 0xffffffffc06e4000 > ? do_one_initcall+0x41/0x1f0 > ? kmem_cache_alloc_trace+0x3f/0x1b0 > ? do_init_module+0x5c/0x260 > ? __do_sys_finit_module+0xa0/0xe0 > ? do_syscall_64+0x35/0x80 > ? entry_SYSCALL_64_after_hwframe+0x44/0xae > </TASK> > kobject_add_internal failed for usb-003:004 with -EEXIST, don't try to register things with the same name in the same directory. > libphy: mii_bus usb-003:004 failed to register > asix: probe of 3-10.4:1.0 failed with error -22 > usbcore: registered new interface driver asix > > > Both these issues with "net: usb: asix: ax88772: add phylib support" > (e532a096be0e) can be reproduced all the way from when it was introduced > to linus current tree. > > > I'm sorry to say that I don't know enough about either libphy or asix to > figure out what cause the issues can be. > > > > //Anton > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
