[PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob.

[Andrew Melnychenko]

Added command "request-ebpf". This command returns
eBPF program encoded base64. The program taken from the
skeleton and essentially is an ELF object that can be
loaded in the future with libbpf.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 qapi/ebpf.json        | 55 +++++++++++++++++++++++++++++++++++++++++++
 qapi/meson.build      |  1 +
 qapi/qapi-schema.json |  1 +
 3 files changed, 57 insertions(+)
 create mode 100644 qapi/ebpf.json

diff --git a/qapi/ebpf.json b/qapi/ebpf.json
new file mode 100644
index 00000000000..6f9a1f1a0c9
--- /dev/null
+++ b/qapi/ebpf.json
@@ -0,0 +1,55 @@
+# -*- Mode: Python -*-
+# vim: filetype=python
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+
+##
+# = Machines
+##
+
+{ 'include': 'common.json' }
+
+##
+# @EbpfObject:
+#
+# Structure that holds eBPF ELF object encoded in base64.
+#
+# Since: 8.1
+#
+##
+{ 'struct': 'EbpfObject',
+  'data': {'object': 'str'} }
+
+##
+# @EbpfProgramID:
+#
+# An enumeration of the eBPF programs. Currently, only RSS is presented.
+# RSS - Receive side scaling, technology that allows steering traffic
+# between queues by calculation hash. Users may set up indirection table
+# and hash/packet types configurations. Used with virtio-net.
+#
+# Since: 8.1
+##
+{ 'enum': 'EbpfProgramID',
+  'data': [ { 'name': 'rss', 'if': 'CONFIG_EBPF' } ] }
+
+##
+# @request-ebpf:
+#
+# Returns eBPF object that can be loaded with libbpf.
+# Management applications (g.e. libvirt) may load it and pass file
+# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
+# It's crucial that eBPF program/map is compatible with QEMU, so it's
+# provided through QMP.
+#
+# Returns: RSS eBPF object encoded in base64.
+#
+# Since: 8.1
+#
+##
+{ 'command': 'request-ebpf',
+  'data': { 'id': 'EbpfProgramID' },
+  'returns': 'EbpfObject',
+  'if': 'CONFIG_EBPF' }
+
diff --git a/qapi/meson.build b/qapi/meson.build
index 9fd480c4d81..12a1cb1f9c2 100644
--- a/qapi/meson.build
+++ b/qapi/meson.build
@@ -52,6 +52,7 @@ qapi_all_modules = [
   'transaction',
   'virtio',
   'yank',
+  'ebpf',
 ]
 if have_system
   qapi_all_modules += [
diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json
index 6594afba312..169cfe8d386 100644
--- a/qapi/qapi-schema.json
+++ b/qapi/qapi-schema.json
@@ -79,3 +79,4 @@
 { 'include': 'virtio.json' }
 { 'include': 'cryptodev.json' }
 { 'include': 'cxl.json' }
+{ 'include': 'ebpf.json' }
-- 
2.39.1