Re: about usb3 <> ethernet adapters for raspberry pi 5

Hi Mark,

On Fri, May 22, 2026 at 11:33:48PM -0700, Mark Millard wrote:

># usbconfig -l -d ugen0.2
>ugen0.2: <RTL8153 Gigabit Ethernet Adapter Realtek Semiconductor Corp.>
>at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps) pwr=ON (72mA)
>- - - - - - - - - - - - - - - - - - - - - - - - -
>[ ID] Interval           Transfer     Bitrate         Retr
>[  5]   0.00-10.03  sec  1.10 GBytes   940 Mbits/sec   50            sender
>[  5]   0.00-10.03  sec  1.10 GBytes   940 Mbits/sec

(snip)

>It turned out that different revisions behave very differently and the
>prior cfg change that had been committed messed up the operation of
>the rev I have access to. In the end, the original default cfg (0) was
>restored and the other rev 0x31fd got a rev-specific Quirk for Realtek
>RTL8153 to use UQ_CFG_INDEX_1 so if_cdce claims rev 0x31fd instead of
>if_ure:
>
>-	USB_QUIRK(REALTEK, RTL8153, UQ_CFG_INDEX_1),
>+	USB_QUIRK_REV(REALTEK, RTL8153, 0x31fd, 0x31fd, UQ_CFG_INDEX_1),
>
>
>The non-0x31fd rev is the type of dongle that I normally use. I do have
>at least one other type of dongle around that was historically slower
>then the RTL8153 ones I have access to. But, back when the type of my
>dongles that I use were speed up (2020-Sep?), I was also a tester for
>the effort at that time.

Are you aware of any quirks required for this:

axge0 on uhub0
axge0: <ASIX AX88179B, class 0/0, rev 3.20/2.00, addr 2> on usbus0
miibus0: <MII bus> on axge0
ukphy0: <Generic IEEE 802.3u media interface>
  PHY 3 on miibus0
  ukphy0:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT-FDX
  , 1000baseT-FDX-master
  , auto, auto-flow
  ue0: <USB Ethernet> on axge0

because iperf3 throughput is really poor (~225Mbit by default, ~300 Mbit with -lro -lso)

I'm wondering now if I should have gone with RTL8153, which was double the cost.
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