new file mode 100644
@@ -0,0 +1,69 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/queue.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-ebpf.h"
+#include "ebpf/ebpf.h"
+
+typedef struct ElfBinaryDataEntry {
+ int id;
+ const void *data;
+ size_t datalen;
+
+ QSLIST_ENTRY(ElfBinaryDataEntry) node;
+} ElfBinaryDataEntry;
+
+static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
+ QSLIST_HEAD_INITIALIZER();
+
+void ebpf_register_binary_data(int id, const void *data, size_t datalen)
+{
+ struct ElfBinaryDataEntry *dataentry = NULL;
+
+ dataentry = g_new0(struct ElfBinaryDataEntry, 1);
+ dataentry->data = data;
+ dataentry->datalen = datalen;
+ dataentry->id = id;
+
+ QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, dataentry, node);
+}
+
+const void *ebpf_find_binary_by_id(int id, size_t *sz, Error **errp)
+{
+ struct ElfBinaryDataEntry *it = NULL;
+ QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
+ if (id == it->id) {
+ *sz = it->datalen;
+ return it->data;
+ }
+ }
+
+ error_setg(errp, "can't find eBPF object with id: %d", id);
+
+ return NULL;
+}
+
+EbpfObject *qmp_request_ebpf(EbpfProgramID id, Error **errp)
+{
+ EbpfObject *ret = NULL;
+ size_t size = 0;
+ const void *data = ebpf_find_binary_by_id(id, &size, errp);
+ if (!data) {
+ return NULL;
+ }
+
+ ret = g_new0(EbpfObject, 1);
+ ret->object = g_base64_encode(data, size);
+
+ return ret;
+}
new file mode 100644
@@ -0,0 +1,29 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef EBPF_H
+#define EBPF_H
+
+
+void ebpf_register_binary_data(int id, const void *data,
+ size_t datalen);
+const void *ebpf_find_binary_by_id(int id, size_t *sz,
+ struct Error **errp);
+
+#define ebpf_binary_init(id, fn) \
+static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
+{ \
+ size_t datalen = 0; \
+ const void *data = fn(&datalen); \
+ ebpf_register_binary_data(id, data, datalen); \
+}
+
+#endif /* EBPF_H */
@@ -13,6 +13,8 @@
#include "qemu/osdep.h"
#include "qemu/error-report.h"
+#include "qapi/qapi-types-misc.h"
+#include "qapi/qapi-commands-ebpf.h"
#include <bpf/libbpf.h>
#include <bpf/bpf.h>
@@ -21,7 +23,7 @@
#include "ebpf/ebpf_rss.h"
#include "ebpf/rss.bpf.skeleton.h"
-#include "trace.h"
+#include "ebpf/ebpf.h"
void ebpf_rss_init(struct EBPFRSSContext *ctx)
{
@@ -53,21 +55,18 @@ static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx)
PROT_READ | PROT_WRITE, MAP_SHARED,
ctx->map_configuration, 0);
if (ctx->mmap_configuration == MAP_FAILED) {
- trace_ebpf_error("eBPF RSS", "can not mmap eBPF configuration array");
return false;
}
ctx->mmap_toeplitz_key = mmap(NULL, qemu_real_host_page_size(),
PROT_READ | PROT_WRITE, MAP_SHARED,
ctx->map_toeplitz_key, 0);
if (ctx->mmap_toeplitz_key == MAP_FAILED) {
- trace_ebpf_error("eBPF RSS", "can not mmap eBPF toeplitz key");
goto toeplitz_fail;
}
ctx->mmap_indirections_table = mmap(NULL, qemu_real_host_page_size(),
PROT_READ | PROT_WRITE, MAP_SHARED,
ctx->map_indirections_table, 0);
if (ctx->mmap_indirections_table == MAP_FAILED) {
- trace_ebpf_error("eBPF RSS", "can not mmap eBPF indirection table");
goto indirection_fail;
}
@@ -109,14 +108,12 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
rss_bpf_ctx = rss_bpf__open();
if (rss_bpf_ctx == NULL) {
- trace_ebpf_error("eBPF RSS", "can not open eBPF RSS object");
goto error;
}
bpf_program__set_type(rss_bpf_ctx->progs.tun_rss_steering_prog, BPF_PROG_TYPE_SOCKET_FILTER);
if (rss_bpf__load(rss_bpf_ctx)) {
- trace_ebpf_error("eBPF RSS", "can not load RSS program");
goto error;
}
@@ -261,3 +258,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
ctx->map_toeplitz_key = -1;
ctx->map_indirections_table = -1;
}
+
+ebpf_binary_init(EBPF_PROGRAMID_RSS, rss_bpf__elf_bytes)
@@ -1 +1 @@
-system_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
+common_ss.add(when: libbpf, if_true: files('ebpf.c', 'ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
deleted file mode 100644
@@ -1 +0,0 @@
-#include "trace/trace-ebpf.h"
new file mode 100644
@@ -0,0 +1,66 @@
+# -*- 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.
+
+##
+# = eBPF Objects
+#
+# eBPF object is an ELF binary that contains the eBPF
+# program and eBPF map description(BTF). Overall, eBPF
+# object should contain the program and enough metadata
+# to create/load eBPF with libbpf. As the eBPF maps/program
+# should correspond to QEMU, the eBPF can't be used from
+# different QEMU build.
+#
+# Currently, there is a possible eBPF for receive-side scaling (RSS).
+#
+##
+
+##
+# @EbpfObject:
+#
+# An eBPF ELF object.
+#
+# @object: the eBPF object encoded in base64
+#
+# Since: 9.0
+##
+{ 'struct': 'EbpfObject',
+ 'data': {'object': 'str'},
+ 'if': 'CONFIG_EBPF' }
+
+##
+# @EbpfProgramID:
+#
+# The eBPF programs that can be gotten with request-ebpf.
+#
+# @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: 9.0
+##
+{ 'enum': 'EbpfProgramID',
+ 'if': 'CONFIG_EBPF',
+ 'data': [ { 'name': 'rss' } ] }
+
+##
+# @request-ebpf:
+#
+# Retrieve an eBPF object that can be loaded with libbpf. Management
+# applications (g.e. libvirt) may load it and pass file descriptors to
+# QEMU, so they can run running QEMU without BPF capabilities.
+#
+# @id: The ID of the program to return.
+#
+# Returns: eBPF object encoded in base64.
+#
+# Since: 9.0
+##
+{ 'command': 'request-ebpf',
+ 'data': { 'id': 'EbpfProgramID' },
+ 'returns': 'EbpfObject',
+ 'if': 'CONFIG_EBPF' }
@@ -33,6 +33,7 @@ qapi_all_modules = [
'crypto',
'cxl',
'dump',
+ 'ebpf',
'error',
'introspect',
'job',
@@ -53,6 +53,7 @@
{ 'include': 'char.json' }
{ 'include': 'dump.json' }
{ 'include': 'net.json' }
+{ 'include': 'ebpf.json' }
{ 'include': 'rdma.json' }
{ 'include': 'rocker.json' }
{ 'include': 'tpm.json' }