diff options
| -rw-r--r-- | ebpf/ebpf.c | 69 | ||||
| -rw-r--r-- | ebpf/ebpf.h | 29 | ||||
| -rw-r--r-- | ebpf/ebpf_rss.c | 11 | ||||
| -rw-r--r-- | ebpf/meson.build | 2 | ||||
| -rw-r--r-- | ebpf/trace.h | 1 | ||||
| -rw-r--r-- | qapi/ebpf.json | 66 | ||||
| -rw-r--r-- | qapi/meson.build | 1 | ||||
| -rw-r--r-- | qapi/qapi-schema.json | 1 |
8 files changed, 172 insertions, 8 deletions
diff --git a/ebpf/ebpf.c b/ebpf/ebpf.c new file mode 100644 index 0000000000..2d73beb479 --- /dev/null +++ b/ebpf/ebpf.c @@ -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; +} diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h new file mode 100644 index 0000000000..378d4e9c70 --- /dev/null +++ b/ebpf/ebpf.h @@ -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 */ diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c index 150aa40813..2e506f9743 100644 --- a/ebpf/ebpf_rss.c +++ b/ebpf/ebpf_rss.c @@ -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) diff --git a/ebpf/meson.build b/ebpf/meson.build index 2f627d6c7d..c5bf9295a2 100644 --- a/ebpf/meson.build +++ b/ebpf/meson.build @@ -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')) diff --git a/ebpf/trace.h b/ebpf/trace.h deleted file mode 100644 index abefc46ab1..0000000000 --- a/ebpf/trace.h +++ /dev/null @@ -1 +0,0 @@ -#include "trace/trace-ebpf.h" diff --git a/qapi/ebpf.json b/qapi/ebpf.json new file mode 100644 index 0000000000..f413d00154 --- /dev/null +++ b/qapi/ebpf.json @@ -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' } diff --git a/qapi/meson.build b/qapi/meson.build index f81a37565c..375d564277 100644 --- a/qapi/meson.build +++ b/qapi/meson.build @@ -33,6 +33,7 @@ qapi_all_modules = [ 'crypto', 'cxl', 'dump', + 'ebpf', 'error', 'introspect', 'job', diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json index c01ec335e6..8304d45625 100644 --- a/qapi/qapi-schema.json +++ b/qapi/qapi-schema.json @@ -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' } |