netmap: fix unit tests

After ad874544d9f018bf8eef4053b5ca7b856c4674cb, interface name
validation has been removed, resulting in two unit tests failures.
Drop the failing tests since they no longer apply.

Reported by: markj

Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

netmap: fix copyin/copyout of nmreq options list

The previous code unsuccesfully attempted to report a precise error for
each option in the user list. Moreover, commit 253b2ec199b broke some
ctrl-api-test (see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260547).

With this patch we bail out as soon as an unrecoverable error is detected and
we properly check for copy boundaries. EOPNOTSUPP no longer immediately
returns an error, so that any other option in the list may be examined
by the caller code and a precise report of the (un)supported options can
be returned to the user.

With this patch, all ctrl-api-test unit tests pass again.

PR: 260547
Submitted by: giuseppe.lettieri@unipi.it
Reviewed by: vmaffione
MFC after: 14 days

netmap tests: Reset ctx->nmctx to NULL in nmreq_parsing.

This avoids leaking a pointer to the on-stack test_nmctx which
triggers a -Wdangling-pointer warning from GCC.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D37536

netmap: update unit tests with libnetmap tests

netmap: several typo fixes

No functional changes intended.

netmap: add test cases for multiple host rings

Extend the netmap unit tests with new test cases for the multiple-host-rings
feature introduced by r345269.

MFC after: 1 week

Polish netmap(4) testcases a bit

1. Not all kernels have netmap(4) support. Check for netmap(4) support before
attempting to run the tests via the `PLAIN_REQUIRE_KERNEL_MODULE(..)` macro.
2. Libraries shouldn't be added to LDFLAGS; they should be added to LIBADD
instead. This allows the build system to evaluate dependencies for sanity.
3. Sort some of the Makefile variables per bsd.README.

1., in particular, will resolve failures when running this testcase on kernels
lacking netmap(4) support, e.g., the i386 GENERIC kernels on ^/stable/11 and
^/stable/12.

PR: 237129
Reviewed by: vmaffione
Approved by: emaste (mentor)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D19864

Skip this test if if_tap module is not available

PR: 236842
Approved by: asomers
MFC after: 1 month
Sponsored by: Netflix

netmap: update unit tests

Revision r345269 introduced changes that triggered a regression on netmap
unit tests (tests/sys/netmap/ctrl-api-test.c).
This change updates the unit tests to remove the regression.

Reported by: lwhsu
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D19639

netmap: unit tests: fix issues found by coverity scan

Reported by: asomers
MFC after: 1 week
Sponsored by: Sunny Valley Networks

netmap: fix warnings on unit tests

Fix some printf() format string warnings raised for ctrl-api-test.c
on some architectures.

MFC after: 1 week
Sponsored by: Sunny Valley Networks

netmap: add suite of unit tests

Import the unit tests from upstream (https://github.com/luigirizzo/netmap
ba02539859d46d33), and make them ready for use with Kyua.
There are currently 38 regression tests, which test the kernel control ABI
exposed by netmap to userspace applications:

1: test for port info get
2-5: tests for basic port registration
6-9: tests for VALE
10-11: tests for getting netmap allocator info
12-15: tests for netmap pipes
16: test on polling mode
17-18: tests on options
19-27: tests for sync-kloop subsystem
28-39: tests for null ports
31-38: tests for the legacy NIOCREGIF registers

Reviewed by: ngie
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D18490