RFC: ALTQ caller refactor

[Kengo NAKAHARA <k-nakahara%iij.ad.jp@localhost>]

Hi,

I want to uniform IFQ_ENQUEUE arguments whether ALTQ is defined or not.
# And I also want to eliminate ALTQ_DECL and ALTQ_COMMA macros...
 So, I make struct altq_pktattr from IFQ_CLASSIFY and IFQ_ENQUEUE argument
to m_tag. Here is the patch.
    http://netbsd.org/~knakahara/altq-caller-refactor/altq-caller-refactor.patch

In above patch, I fix performance issue by the following two ways.
    - make ALTQ's m_tag pool cache
    - inline altq_*_pattr functions
Without these two fixes, the enabled ALTQ throughput degraded about 10%.
However, with these two fixes, the throughput is almost the same
performance.

Could you comment this patch? Any comments are welcome. In particular,
comments compared with the following thread.
http://mail-index.netbsd.org/tech-kern/2016/02/19/msg020238.html


Thanks,

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Device Engineering Section,
Core Product Development Department,
Product Division,
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Kengo NAKAHARA <k-nakahara%iij.ad.jp@localhost>