Hi, Please Cc me for changes related to dwc3. On Sat, Sep 02, 2023, Dingyan Li wrote: > Currently there are there major generations when speaking of > USB_SPEED_SUPER_PLUS devices. However, they actually stands > for different physical speeds. GEN_2x2 means 20Gbps, while > the others mean 10Gbps. So in order to confirm 20Gbps, both > speed and generation need ti be checked. This causes a trouble > for ioctl USBDEVFS_GET_SPEED since it can only return speed > value to userspace. > > In order not to add a new ioctl to get ssp generation, extending > usb_device_speed is a good option. The side effect is that > USB_SPEED_SUPER_PLUS has been used in lots of places and > it also takes some effort to go through all of them and check > whether the new speed should be used too. > > Besides, as suggested by Alen, ssp_rate is not a proper name, > change it to ssp_gen. And change all functions/struct fileds > ended with ssp_rate to ssp_gen. And there is also some code > refactor to reduce duplicate definition of strings and increase > the utilization of commonly defined utilities. > > Signed-off-by: Dingyan Li <18500469033@xxxxxxx> Why not spell out the whole thing instead of USB_SPEED_SUPER_PLUS_BY2 (ie. USB_SPEED_SUPER_PLUS_GEN_2x2) as you intended instead of just the lane count. There are SuperSpeed Plus generation _and_ lane count. That's why I didn't name "usb_ssp_gen" that only reflects the generation and not the lane count. Also, I didn't extend usb_device_speed because gen XxY are all a single speed: SuperSpeed Plus. If you're planning to do it this way, why not add the other speeds (such as gen 1x2) to usb_device_speed enum too? Then we can drop the usb_ssp_rate enum. If we're going to check multiple enum for SuperSpeed Plus, we probably need a usb_device_is_superspeed_plus() function. Now we need to audit all the greater/lesser speed checks that use < or > to make sure that they are used how they were intended to. Since these changes are not simple and will touch on multiple places, please split this patch out. Thanks, Thinh
