FreeBSD/src 8f82136 (r343291)sys/dev/vmware/vmxnet3 if_vmx.c if_vmxvar.h, sys/net iflib.c iflib.h

onvert vmx(4) to being an iflib driver.

Also, expose IFLIB_MAX_RX_SEGS to iflib drivers and add
iflib_dma_alloc_align() to the iflib API.

Performance is generally better with the tunable/sysctl
dev.vmx.<index>.iflib.tx_abdicate=1.

Reviewed by:    shurd
MFC after:      1 week
Relnotes:       yes
Sponsored by:   RG Nets
Differential Revision:  https://reviews.freebsd.org/D18761
DeltaFile
+1,186-2,718sys/dev/vmware/vmxnet3/if_vmx.c
+33-185sys/dev/vmware/vmxnet3/if_vmxvar.h
+13-8sys/net/iflib.c
+4-0sys/net/iflib.h
+1,236-2,9114 files

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