LinuxKPI: add page pool skeleton

[bz]

Summary

Add the page pool skeleton based on a wireless driver. We have to
sort out some struct page problems first before we can start
implementing this but that should happen independent of all other
changes.

MFC after: 10 days

[emaste]

sys/compat/linuxkpi/common/include/net/page_pool.h

73

looks like this should take another arg?

89

could this be const? (even if not matching linux)

[bz]

Make function argument const as suggested by @emaste

[bz]

sys/compat/linuxkpi/common/include/net/page_pool.h

73

Based on what? Have they changed things already again? Based on roughly v6.4-rc1 driver I see:

page = page_pool_dev_alloc_frag(q->page_pool, offset, size);

89

Probably. Given the input I get from the driver wasn't const I hadn't put thought into it yet. Not sure what Linux does. I'll change it.

[bz]

sys/compat/linuxkpi/common/include/net/page_pool.h

73

@emaste based on what was your comment suggesting another argument? Did you check an older version of Linux and they have changed it?

[emaste]

sys/compat/linuxkpi/common/include/net/page_pool.h

73

Hmm, good question - looking now, I'm not sure what I was thinking.