Merge branch 'net-make-sure-we-retain-napi-ordering-on-netdev-napi_list'

Jakub Kicinski says:

====================
net: make sure we retain NAPI ordering on netdev->napi_list

I promised Eric to remove the rtnl protection of the NAPI list,
when I sat down to implement it over the break I realized that
the recently added NAPI ID retention will break the list ordering
assumption we have in netlink dump. The ordering used to happen
"naturally", because we'd always add NAPIs that the head of the
list, and assign a new monotonically increasing ID.

Before the first patch of this series we'd still only add at
the head of the list but now the newly added NAPI may inherit
from its config an ID lower than something else already on the list.

The fix is in the first patch, the rest is netdevsim churn to test it.
I'm posting this for net-next, because AFAICT the problem can't
be triggered in net, given the very limited queue API adoption.

v2:
 - [patch 2] allocate the array with kcalloc() instead of kvcalloc()
 - [patch 2] set GFP_KERNEL_ACCOUNT when allocating queues
 - [patch 6] don't null-check page pool before page_pool_destroy()
 - [patch 6] controled -> controlled
 - [patch 7] change mode to 0200
 - [patch 7] reorder removal to be inverse of add
 - [patch 7] fix the spaces vs tabs
v1: https://lore.kernel.org/[email protected]
====================

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: Paolo Abeni

Documentation/networking/netdevices.rst

@@ -297,3 +297,13 @@ napi->poll:
 	Context:
 		 softirq
 		 will be called with interrupts disabled by netconsole.
+
+NETDEV_INTERNAL symbol namespace
+================================
+
+Symbols exported as NETDEV_INTERNAL can only be used in networking
+core and drivers which exclusively flow via the main networking list and trees.
+Note that the inverse is not true, most symbols outside of NETDEV_INTERNAL
+are not expected to be used by random code outside netdev either.
+Symbols may lack the designation because they predate the namespaces,
+or simply due to an oversight.