K 10
svn:author
V 5
shurd
K 8
svn:date
V 27
2018-09-06T18:51:52.596496Z
K 7
svn:log
V 654
Clean up iflib sysctls

Remove sysctls:
txq_drain_encapfail - now a duplicate of encap_txd_encap_fail
intr_link - was never incremented
intr_msix - was never incremented
rx_zero_len - was never incremented

The following were not incremented in all code-paths that apply:
m_pullups, mbuf_defrag, rxd_flush, tx_encap, rx_intr_enables, tx_frees,
encap_txd_encap_fail.

Fixes:
Replace the broken collapse_pkthdr() implementation with an MPASS().
fl_refills and fl_refills_large were not incremented when using netmap.

Reviewed by:	gallatin
Approved by:	re (marius)
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D16733

END