LinuxKPI: netdevice: add alloc_netdev_dummy()

Add alloc_netdev_dummy() which is needed by an updated rtw88 driver.
Given we already call linuxkpi_init_dummy_netdev() ourselves allow the
setup functi

LinuxKPI: netdevice: add alloc_netdev_dummy()

Add alloc_netdev_dummy() which is needed by an updated rtw88 driver.
Given we already call linuxkpi_init_dummy_netdev() ourselves allow the
setup function to be NULL to not initialize and start a tasq td twice.

Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D46802

(cherry picked from commit 105331f658e2f14fb4daa64dcd076c7369505295)

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LinuxKPI: napi_schedule() requires return value, implement napi_is_scheduled()

A newer version of iwlwifi requires a return value from napi_schedule();
unclear if the function always should have bee

LinuxKPI: napi_schedule() requires return value, implement napi_is_scheduled()

A newer version of iwlwifi requires a return value from napi_schedule();
unclear if the function always should have been bool. Add the bool to test
based on the napi_schedule_prep() result.

Also add napi_is_scheduled() for rtw89.

Sponsored by: The FreeBSD Foundation
Reviewed by: emaste (previous version)
Differential Revision: https://reviews.freebsd.org/D44591

(cherry picked from commit 21761f2ede4ebad13e78112b9409c1f20f946781)

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sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

LinuxKPI: iwlwifi: rtw88: rtw89: remove budget argument from netif_napi_add()

In preparation for future updates remove the budget argument from the
netif_napi_add() in drivers and update LinuxKPI to

LinuxKPI: iwlwifi: rtw88: rtw89: remove budget argument from netif_napi_add()

In preparation for future updates remove the budget argument from the
netif_napi_add() in drivers and update LinuxKPI to reflect that it is
gone and only set it internally. This required changes to the currently
committed wireless drivers based on LinuxKPI (iwlwifi, rtw88, rtw89).

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

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LinuxKPI: netdev: expose napi state

There are drivers directly accessing napi->state testing for bits
(NAPI_STATE_SCHED encountered so far). Rename the internal _flags
struct field to state and exp

LinuxKPI: netdev: expose napi state

There are drivers directly accessing napi->state testing for bits
(NAPI_STATE_SCHED encountered so far). Rename the internal _flags
struct field to state and expose our internal state flag bits along
with the one official aliased.

As I left in a comment, I wished Linux would hide these accesses
behind inline functions or by other means and not public expose
the implementation details.

MFC after: 1 week

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LinuxKPI: import beginning of a new version of netdevice.h

Import a netdevice update complementing the last remaining bits of
the old ifnet derived implementation. Along add a (for now) task
based

LinuxKPI: import beginning of a new version of netdevice.h

Import a netdevice update complementing the last remaining bits of
the old ifnet derived implementation. Along add a (for now) task
based NAPI implementation.

This is the minimal set of chnages which are needed for the initial
support of wireless drivers. The NAPI implementation has an option to
still switch to "direct dispatch" as it had been used by these drivers
before not relying on a deferred context along with some printf tracing.
This has been helpful in the last weeks for debugging and will be
cleaned once we have had broader testing and are sure this is fine as-is.
Should we need a more time-sensitive or load-sensitive response
in the future we can always switch to something more sophisticated.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
X-Differential Revision: D33075 (abandoned without feedback a while ago)

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