usb driver 裡有一個 flag : has_tt.
tt 是 Transation Translater.
Wifi 說這個東西是 hub 用的。
hub 接到 High Speed 的 device 時，直接接到 up.
hub 接到 full speed 的 device 時，先經過 TT，再到 up
這是為了比免低速的 packet 站住大部分 up 的頻寬。
TT 會先用低速 buffer 住 full speed 的packet，再用 High Speed 送到 UP
ubuntu 在 R40e 上 還有 Debian 在 Sempron 2600 上
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