LinuxKPI: skbuff: fix skb_queue_splice_init()

In skb_queue_splice_init() we set a next value and then used that new
value to further update the remaining linking rather than the original
value. Int

LinuxKPI: skbuff: fix skb_queue_splice_init()

In skb_queue_splice_init() we set a next value and then used that new
value to further update the remaining linking rather than the original
value. Introduce another temporary variable 'n' to hold the original
value and use that.
While here rename q and h to from and to as otherwise it was too
confusing to read.

Also initialize skb->prev and skb->next to point to skb itself if
for nothing else at least to aid debugging.

Approved by: re (gjb)
Reported by: phk (panic in iwl_txq_reclaim)
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 6a8973c3324c0c6c270ae4ad371e50c0ec5761da)
(cherry picked from commit 32d1d7fee61328e65ae944836d1027335ccb979c)

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LinuxKPI: skbuff updates

Various updates to skbuff for new/updated drivers and some housekeeping:
- update types and struct members, add new (stub) functions
- improve freeing of frags.
- fix an iss

LinuxKPI: skbuff updates

Various updates to skbuff for new/updated drivers and some housekeeping:
- update types and struct members, add new (stub) functions
- improve freeing of frags.
- fix an issue with sleeping during alloc for dev_alloc_skb().
- Adjust a KASSERT for skb_reserve() which apparently can be called
multiple times if no data was put into the skb yet.
- move the sysctl from linux_8022.c (which may be in a different module)
to linux_skbuff.c so in case we turn debugging on we do not run into
unresolved symbols. Rename the sysctl variable to be less conflicting
and update debugging macros along with that; also add IMPROVE().
- add DDB support to show an skbuff.
- adjust comments/whitespace.

No functional changes intended for iwlwifi.

Sponsored by: The FreeBSD Foundation (partially)

(cherry picked from commit 6baea3312d92cd7eb25f5b9e0e474132636f62d9)

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LinuxKPI: add a work-in-progress skbuff implementation

This is a work-in-progress implementation of sk_buff compat code
used for wireless drivers only currently.
Bring in this version of the code as

LinuxKPI: add a work-in-progress skbuff implementation

This is a work-in-progress implementation of sk_buff compat code
used for wireless drivers only currently.
Bring in this version of the code as it has proven to be good enough
to have packets going for a few months.

The current implementation has several drawbacks including the need
for us to copy data between sk_buffs and mbufs.
Do not rely on the internals of this implementation. They are highly
likely to change as we will improve the integration to FreeBSD mbufs.

Sponsored by: The FreeBSD Foundation

(cherry picked from commit 49ed6e979c3b327ae466a559884802d901aa5792)

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