Prefetch next CQ descriptor in Completion Queue handling loop of VNIC

[wma]

Did you check this prefetch works on clang? i.e. does it generate asm mnemonic?
Is it possible that GET_CQ_DESC return invalid pointer? In that case we need to validate it, because prefetch instruction can trigger data abort on thunderx.

[zbb]

In D5322#115098, @wma wrote:

Did you check this prefetch works on clang? i.e. does it generate asm mnemonic?
Is it possible that GET_CQ_DESC return invalid pointer? In that case we need to validate it, because prefetch instruction can trigger data abort on thunderx.

Yes, it works on clang and prefetch can be used with any phony address on ThunderX.
If there are no objections then I will commit that.

[wma]

In that case ACK

[zbb]

https://svnweb.freebsd.org/changeset/base/296032