+nic_swsd [adding per Realtek developer team request] On Sat, Jan 16, 2021 at 5:27 AM Grant Grundler <grundler@xxxxxxxxxxxx> wrote: > > RTL8156 sends notifications about every 32ms. > Only display/log notifications when something changes. > > This issue has been reported by others: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1832472 > https://lkml.org/lkml/2020/8/27/1083 > > ... > [785962.779840] usb 1-1: new high-speed USB device number 5 using xhci_hcd > [785962.929944] usb 1-1: New USB device found, idVendor=0bda, idProduct=8156, bcdDevice=30.00 > [785962.929949] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6 > [785962.929952] usb 1-1: Product: USB 10/100/1G/2.5G LAN > [785962.929954] usb 1-1: Manufacturer: Realtek > [785962.929956] usb 1-1: SerialNumber: 000000001 > [785962.991755] usbcore: registered new interface driver cdc_ether > [785963.017068] cdc_ncm 1-1:2.0: MAC-Address: 00:24:27:88:08:15 > [785963.017072] cdc_ncm 1-1:2.0: setting rx_max = 16384 > [785963.017169] cdc_ncm 1-1:2.0: setting tx_max = 16384 > [785963.017682] cdc_ncm 1-1:2.0 usb0: register 'cdc_ncm' at usb-0000:00:14.0-1, CDC NCM, 00:24:27:88:08:15 > [785963.019211] usbcore: registered new interface driver cdc_ncm > [785963.023856] usbcore: registered new interface driver cdc_wdm > [785963.025461] usbcore: registered new interface driver cdc_mbim > [785963.038824] cdc_ncm 1-1:2.0 enx002427880815: renamed from usb0 > [785963.089586] cdc_ncm 1-1:2.0 enx002427880815: network connection: disconnected > [785963.121673] cdc_ncm 1-1:2.0 enx002427880815: network connection: disconnected > [785963.153682] cdc_ncm 1-1:2.0 enx002427880815: network connection: disconnected > ... > > This is about 2KB per second and will overwrite all contents of a 1MB > dmesg buffer in under 10 minutes rendering them useless for debugging > many kernel problems. > > This is also an extra 180 MB/day in /var/logs (or 1GB per week) rendering > the majority of those logs useless too. > > When the link is up (expected state), spew amount is >2x higher: > ... > [786139.600992] cdc_ncm 2-1:2.0 enx002427880815: network connection: connected > [786139.632997] cdc_ncm 2-1:2.0 enx002427880815: 2500 mbit/s downlink 2500 mbit/s uplink > [786139.665097] cdc_ncm 2-1:2.0 enx002427880815: network connection: connected > [786139.697100] cdc_ncm 2-1:2.0 enx002427880815: 2500 mbit/s downlink 2500 mbit/s uplink > [786139.729094] cdc_ncm 2-1:2.0 enx002427880815: network connection: connected > [786139.761108] cdc_ncm 2-1:2.0 enx002427880815: 2500 mbit/s downlink 2500 mbit/s uplink > ... > > Chrome OS cannot support RTL8156 until this is fixed. > > Signed-off-by: Grant Grundler <grundler@xxxxxxxxxxxx> > --- > drivers/net/usb/cdc_ncm.c | 12 +++++++++++- > include/linux/usb/usbnet.h | 2 ++ > 2 files changed, 13 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c > index 25498c311551..5de096545b86 100644 > --- a/drivers/net/usb/cdc_ncm.c > +++ b/drivers/net/usb/cdc_ncm.c > @@ -1827,6 +1827,15 @@ cdc_ncm_speed_change(struct usbnet *dev, > uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); > uint32_t tx_speed = le32_to_cpu(data->ULBitRate); > > + /* if the speed hasn't changed, don't report it. > + * RTL8156 shipped before 2021 sends notification about every 32ms. > + */ > + if (dev->rx_speed == rx_speed && dev->tx_speed == tx_speed) > + return; > + > + dev->rx_speed = rx_speed; > + dev->tx_speed = tx_speed; > + > /* > * Currently the USB-NET API does not support reporting the actual > * device speed. Do print it instead. > @@ -1867,7 +1876,8 @@ static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) > * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be > * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. > */ > - usbnet_link_change(dev, !!event->wValue, 0); > + if (netif_carrier_ok(dev->net) != !!event->wValue) > + usbnet_link_change(dev, !!event->wValue, 0); > break; > > case USB_CDC_NOTIFY_SPEED_CHANGE: > diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h > index 88a7673894d5..cfbfd6fe01df 100644 > --- a/include/linux/usb/usbnet.h > +++ b/include/linux/usb/usbnet.h > @@ -81,6 +81,8 @@ struct usbnet { > # define EVENT_LINK_CHANGE 11 > # define EVENT_SET_RX_MODE 12 > # define EVENT_NO_IP_ALIGN 13 > + u32 rx_speed; /* in bps - NOT Mbps */ > + u32 tx_speed; /* in bps - NOT Mbps */ > }; > > static inline struct usb_driver *driver_of(struct usb_interface *intf) > -- > 2.29.2 >
