MFC 303603-303605,303764
303603
hyperv/vmbus: Remove the artificial entry limit of SG and PRP list. Just make sure that the total channel packet size does not exceed 1/2 data size of the TX bufring. Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7359
303604
hyperv/storvsc: Set maxio to 128KB. Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7360
303605
hyperv/storvsc: Stringent PRP list assertions Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7361
303764
hyperv/vmbus: Only make sure the TX bufring will not be closed. KVP can write data, whose size is > 1/2 TX bufring size. Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D7414