> From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-owner@xxxxxxxxxxxxxxx] On Behalf Of Sarah Sharp > Sent: Thursday, January 30, 2014 10:44 AM > To: David Laight > Cc: renevant@xxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; Mark Lord; Greg Kroah-Hartman; > netdev@xxxxxxxxxxxxxxx > Subject: Re: Help testing for USB ethernet/xHCI regression > > On Thu, Jan 30, 2014 at 09:44:53AM +0000, David Laight wrote: > > From: Sarah Sharp > > > > Current issue is when plugging in the ax88179 there is lag when bringing the > > > > interface up and a bunch of kernel messages: > > > > > [ 79.481028] IPv6: ADDRCONF(NETDEV_UP): enp7s0u1: link is not ready > > > > [ 82.210721] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1 > > > > [ 82.338947] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1 > > > > [ 82.467148] ax88179_178a 2-1:1.0 enp7s0u1: kevent 4 may have been dropped > > > > [ 82.470028] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1 > > > > [ 82.595364] ax88179_178a 2-1:1.0 enp7s0u1: kevent 4 may have been dropped > > > > [ 82.598312] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1 > > > > [ 82.723580] ax88179_178a 2-1:1.0 enp7s0u1: kevent 4 may have been dropped > > > > [ 82.726487] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1 > > > > [ 82.851796] ax88179_178a 2-1:1.0 enp7s0u1: kevent 4 may have been dropped > > > > [ 82.854642] ax88179_178a 2-1:1.0 enp7s0u1: ax88179 - Link status is: 1 > > > > > > > With which kernel? > > > > I saw similar issues testing some patches yesterday. > > Both with the ax179_178a and smsx95xx cards (connected to xhci). > > My kernel claims to be 3.13.0-dsl+ but it is lying since it was > > updated from linus's tree earlier this week. > > I'd not seen any similar delays until the last week or so. > > I see a report that these types of errors have been seen since the 3.11 > kernel: > > http://marc.info/?l=linux-usb&m=139105963723745&w=2 > > Since the USB ethernet scatter-gather support wasn't added until the > 3.12 kernel, it's unlikely that the xHCI TD fragment issue is actually > the root cause. > > The interesting piece of information in that report is that when the USB > 3.0 device falls back to USB 2.0 speeds under xHCI, it works. > > > The xhci controller I'm using is the Intel 'Panther Point' 8086:1e31 > > rev 4 (also says 8086:1e2d and 8086:1e26). > > That's the host I have as well. I've been able to find an ASIX device > with the right chipset, so I'm going to poke around at what's happening > at the USB 3.0 bus level. Hi Sarah, Can you give a pointer to where we could buy one of these devices? I would like to test this with our (Synopsys) xHCI controller as well. -- Paul -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
