* [PATCH v2 0/6] eBPF RSS through QMP support.
@ 2023-05-12 12:28 Andrew Melnychenko
2023-05-12 12:28 ` [PATCH v2 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
` (6 more replies)
0 siblings, 7 replies; 26+ messages in thread
From: Andrew Melnychenko @ 2023-05-12 12:28 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
This series of patches provides the ability to retrieve eBPF program
through qmp, so management application may load bpf blob with proper capabilities.
Now, virtio-net devices can accept eBPF programs and maps through properties
as external file descriptors. Access to the eBPF map is direct through mmap()
call, so it should not require additional capabilities to bpf* calls.
eBPF file descriptors can be passed to QEMU from parent process or by unix
socket with sendfd() qmp command.
Changes since v1:
* refactored code.
* eBPF program ids implemented as enums
Andrew Melnychenko (6):
ebpf: Added eBPF map update through mmap.
ebpf: Added eBPF initialization by fds.
virtio-net: Added property to load eBPF RSS with fds.
ebpf: Added declaration/initialization routines.
qmp: Added new command to retrieve eBPF blob.
ebpf: Updated eBPF program and skeleton.
ebpf/ebpf.c | 54 ++
ebpf/ebpf.h | 31 +
ebpf/ebpf_rss-stub.c | 6 +
ebpf/ebpf_rss.c | 149 +++-
ebpf/ebpf_rss.h | 10 +
ebpf/meson.build | 1 +
ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++----------------
hw/net/virtio-net.c | 55 +-
include/hw/virtio/virtio-net.h | 1 +
monitor/qmp-cmds.c | 16 +
qapi/misc.json | 38 +
tools/ebpf/rss.bpf.c | 2 +-
12 files changed, 1073 insertions(+), 759 deletions(-)
create mode 100644 ebpf/ebpf.c
create mode 100644 ebpf/ebpf.h
--
2.39.1
^ permalink raw reply [flat|nested] 26+ messages in thread
* [PATCH v2 1/6] ebpf: Added eBPF map update through mmap.
2023-05-12 12:28 [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnychenko
@ 2023-05-12 12:28 ` Andrew Melnychenko
2023-05-15 9:34 ` Daniel P. Berrangé
2023-05-12 12:28 ` [PATCH v2 2/6] ebpf: Added eBPF initialization by fds Andrew Melnychenko
` (5 subsequent siblings)
6 siblings, 1 reply; 26+ messages in thread
From: Andrew Melnychenko @ 2023-05-12 12:28 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
Changed eBPF map updates through mmaped array.
Mmaped arrays provide direct access to map data.
It should omit using bpf_map_update_elem() call,
which may require capabilities that are not present.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/ebpf_rss.c | 117 ++++++++++++++++++++++++++++++++++++++----------
ebpf/ebpf_rss.h | 5 +++
2 files changed, 99 insertions(+), 23 deletions(-)
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index cee658c158b..247f5eee1b6 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -27,19 +27,83 @@ void ebpf_rss_init(struct EBPFRSSContext *ctx)
{
if (ctx != NULL) {
ctx->obj = NULL;
+ ctx->program_fd = -1;
+ ctx->map_configuration = -1;
+ ctx->map_toeplitz_key = -1;
+ ctx->map_indirections_table = -1;
+
+ ctx->mmap_configuration = NULL;
+ ctx->mmap_toeplitz_key = NULL;
+ ctx->mmap_indirections_table = NULL;
}
}
bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx)
{
- return ctx != NULL && ctx->obj != NULL;
+ return ctx != NULL && (ctx->obj != NULL || ctx->program_fd != -1);
+}
+
+static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx)
+{
+ if (!ebpf_rss_is_loaded(ctx)) {
+ return false;
+ }
+
+ ctx->mmap_configuration = mmap(NULL, qemu_real_host_page_size(),
+ 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;
+ }
+
+ return true;
+
+indirection_fail:
+ munmap(ctx->mmap_toeplitz_key, qemu_real_host_page_size());
+toeplitz_fail:
+ munmap(ctx->mmap_configuration, qemu_real_host_page_size());
+
+ ctx->mmap_configuration = NULL;
+ ctx->mmap_toeplitz_key = NULL;
+ ctx->mmap_indirections_table = NULL;
+ return false;
+}
+
+static void ebpf_rss_munmap(struct EBPFRSSContext *ctx)
+{
+ if (!ebpf_rss_is_loaded(ctx)) {
+ return;
+ }
+
+ munmap(ctx->mmap_indirections_table, qemu_real_host_page_size());
+ munmap(ctx->mmap_toeplitz_key, qemu_real_host_page_size());
+ munmap(ctx->mmap_configuration, qemu_real_host_page_size());
+
+ ctx->mmap_configuration = NULL;
+ ctx->mmap_toeplitz_key = NULL;
+ ctx->mmap_indirections_table = NULL;
}
bool ebpf_rss_load(struct EBPFRSSContext *ctx)
{
struct rss_bpf *rss_bpf_ctx;
- if (ctx == NULL) {
+ if (ctx == NULL || ebpf_rss_is_loaded(ctx)) {
return false;
}
@@ -66,10 +130,18 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
ctx->map_toeplitz_key = bpf_map__fd(
rss_bpf_ctx->maps.tap_rss_map_toeplitz_key);
+ if (!ebpf_rss_mmap(ctx)) {
+ goto error;
+ }
+
return true;
error:
rss_bpf__destroy(rss_bpf_ctx);
ctx->obj = NULL;
+ ctx->program_fd = -1;
+ ctx->map_configuration = -1;
+ ctx->map_toeplitz_key = -1;
+ ctx->map_indirections_table = -1;
return false;
}
@@ -77,15 +149,11 @@ error:
static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
struct EBPFRSSConfig *config)
{
- uint32_t map_key = 0;
-
if (!ebpf_rss_is_loaded(ctx)) {
return false;
}
- if (bpf_map_update_elem(ctx->map_configuration,
- &map_key, config, 0) < 0) {
- return false;
- }
+
+ memcpy(ctx->mmap_configuration, config, sizeof(*config));
return true;
}
@@ -93,27 +161,19 @@ static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx,
uint16_t *indirections_table,
size_t len)
{
- uint32_t i = 0;
-
if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL ||
len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
return false;
}
- for (; i < len; ++i) {
- if (bpf_map_update_elem(ctx->map_indirections_table, &i,
- indirections_table + i, 0) < 0) {
- return false;
- }
- }
+ memcpy(ctx->mmap_indirections_table, indirections_table,
+ sizeof(*indirections_table) * len);
return true;
}
static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx,
uint8_t *toeplitz_key)
{
- uint32_t map_key = 0;
-
/* prepare toeplitz key */
uint8_t toe[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {};
@@ -123,10 +183,7 @@ static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx,
memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_MAX_KEY_SIZE);
*(uint32_t *)toe = ntohl(*(uint32_t *)toe);
- if (bpf_map_update_elem(ctx->map_toeplitz_key, &map_key, toe,
- 0) < 0) {
- return false;
- }
+ memcpy(ctx->mmap_toeplitz_key, toe, VIRTIO_NET_RSS_MAX_KEY_SIZE);
return true;
}
@@ -160,6 +217,20 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
return;
}
- rss_bpf__destroy(ctx->obj);
+ ebpf_rss_munmap(ctx);
+
+ if (ctx->obj) {
+ rss_bpf__destroy(ctx->obj);
+ } else {
+ close(ctx->program_fd);
+ close(ctx->map_configuration);
+ close(ctx->map_toeplitz_key);
+ close(ctx->map_indirections_table);
+ }
+
ctx->obj = NULL;
+ ctx->program_fd = -1;
+ ctx->map_configuration = -1;
+ ctx->map_toeplitz_key = -1;
+ ctx->map_indirections_table = -1;
}
diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
index bf3f2572c7c..ab08a7266d0 100644
--- a/ebpf/ebpf_rss.h
+++ b/ebpf/ebpf_rss.h
@@ -20,6 +20,11 @@ struct EBPFRSSContext {
int map_configuration;
int map_toeplitz_key;
int map_indirections_table;
+
+ /* mapped eBPF maps for direct access to omit bpf_map_update_elem() */
+ void *mmap_configuration;
+ void *mmap_toeplitz_key;
+ void *mmap_indirections_table;
};
struct EBPFRSSConfig {
--
2.39.1
^ permalink raw reply related [flat|nested] 26+ messages in thread
* [PATCH v2 2/6] ebpf: Added eBPF initialization by fds.
2023-05-12 12:28 [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnychenko
2023-05-12 12:28 ` [PATCH v2 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
@ 2023-05-12 12:28 ` Andrew Melnychenko
2023-05-15 9:35 ` Daniel P. Berrangé
2023-05-12 12:28 ` [PATCH v2 3/6] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
` (4 subsequent siblings)
6 siblings, 1 reply; 26+ messages in thread
From: Andrew Melnychenko @ 2023-05-12 12:28 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
It allows using file descriptors of eBPF provided
outside of QEMU.
QEMU may be run without capabilities for eBPF and run
RSS program provided by management tool(g.e. libvirt).
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/ebpf_rss-stub.c | 6 ++++++
ebpf/ebpf_rss.c | 27 +++++++++++++++++++++++++++
ebpf/ebpf_rss.h | 5 +++++
3 files changed, 38 insertions(+)
diff --git a/ebpf/ebpf_rss-stub.c b/ebpf/ebpf_rss-stub.c
index e71e229190d..8d7fae2ad92 100644
--- a/ebpf/ebpf_rss-stub.c
+++ b/ebpf/ebpf_rss-stub.c
@@ -28,6 +28,12 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
return false;
}
+bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
+ int config_fd, int toeplitz_fd, int table_fd)
+{
+ return false;
+}
+
bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
uint16_t *indirections_table, uint8_t *toeplitz_key)
{
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 247f5eee1b6..24bc6cc409e 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -146,6 +146,33 @@ error:
return false;
}
+bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
+ int config_fd, int toeplitz_fd, int table_fd)
+{
+ if (ctx == NULL || ebpf_rss_is_loaded(ctx)) {
+ return false;
+ }
+
+ if (program_fd < 0 || config_fd < 0 || toeplitz_fd < 0 || table_fd < 0) {
+ return false;
+ }
+
+ ctx->program_fd = program_fd;
+ ctx->map_configuration = config_fd;
+ ctx->map_toeplitz_key = toeplitz_fd;
+ ctx->map_indirections_table = table_fd;
+
+ if (!ebpf_rss_mmap(ctx)) {
+ ctx->program_fd = -1;
+ ctx->map_configuration = -1;
+ ctx->map_toeplitz_key = -1;
+ ctx->map_indirections_table = -1;
+ return false;
+ }
+
+ return true;
+}
+
static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
struct EBPFRSSConfig *config)
{
diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
index ab08a7266d0..239242b0d26 100644
--- a/ebpf/ebpf_rss.h
+++ b/ebpf/ebpf_rss.h
@@ -14,6 +14,8 @@
#ifndef QEMU_EBPF_RSS_H
#define QEMU_EBPF_RSS_H
+#define EBPF_RSS_MAX_FDS 4
+
struct EBPFRSSContext {
void *obj;
int program_fd;
@@ -41,6 +43,9 @@ bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx);
bool ebpf_rss_load(struct EBPFRSSContext *ctx);
+bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
+ int config_fd, int toeplitz_fd, int table_fd);
+
bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
uint16_t *indirections_table, uint8_t *toeplitz_key);
--
2.39.1
^ permalink raw reply related [flat|nested] 26+ messages in thread
* [PATCH v2 3/6] virtio-net: Added property to load eBPF RSS with fds.
2023-05-12 12:28 [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnychenko
2023-05-12 12:28 ` [PATCH v2 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
2023-05-12 12:28 ` [PATCH v2 2/6] ebpf: Added eBPF initialization by fds Andrew Melnychenko
@ 2023-05-12 12:28 ` Andrew Melnychenko
2023-05-15 9:38 ` Daniel P. Berrangé
2023-05-12 12:29 ` [PATCH v2 4/6] ebpf: Added declaration/initialization routines Andrew Melnychenko
` (3 subsequent siblings)
6 siblings, 1 reply; 26+ messages in thread
From: Andrew Melnychenko @ 2023-05-12 12:28 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
eBPF RSS program and maps may now be passed during initialization.
Initially was implemented for libvirt to launch qemu without permissions,
and initialized eBPF program through the helper.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
hw/net/virtio-net.c | 55 ++++++++++++++++++++++++++++++----
include/hw/virtio/virtio-net.h | 1 +
2 files changed, 50 insertions(+), 6 deletions(-)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 53e1c326433..a62d7936948 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -42,6 +42,7 @@
#include "sysemu/sysemu.h"
#include "trace.h"
#include "monitor/qdev.h"
+#include "monitor/monitor.h"
#include "hw/pci/pci_device.h"
#include "net_rx_pkt.h"
#include "hw/virtio/vhost.h"
@@ -1305,14 +1306,55 @@ static void virtio_net_detach_epbf_rss(VirtIONet *n)
virtio_net_attach_ebpf_to_backend(n->nic, -1);
}
-static bool virtio_net_load_ebpf(VirtIONet *n)
+static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
{
- if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
- /* backend does't support steering ebpf */
- return false;
+ int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
+ int nfds = 0;
+ int ret = true;
+ int i = 0;
+ g_autofree char **fds_strs = g_strsplit(n->ebpf_rss_fds, ":", 0);
+
+ ERRP_GUARD();
+
+ if (g_strv_length(fds_strs) != EBPF_RSS_MAX_FDS) {
+ error_setg(errp,
+ "Expected %d file descriptors but got %d",
+ EBPF_RSS_MAX_FDS, g_strv_length(fds_strs));
+ return false;
+ }
+
+ for (i = 0; i < nfds; i++) {
+ fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], errp);
+ if (*errp) {
+ ret = false;
+ goto exit;
+ }
+ }
+
+ ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
+
+exit:
+ if (!ret || *errp) {
+ for (i = 0; i < nfds && fds[i] != -1; i++) {
+ close(fds[i]);
+ }
}
- return ebpf_rss_load(&n->ebpf_rss);
+ return ret;
+}
+
+static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
+{
+ bool ret = false;
+
+ if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
+ if (!(n->ebpf_rss_fds
+ && virtio_net_load_ebpf_fds(n, errp))) {
+ ret = ebpf_rss_load(&n->ebpf_rss);
+ }
+ }
+
+ return ret;
}
static void virtio_net_unload_ebpf(VirtIONet *n)
@@ -3738,7 +3780,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
net_rx_pkt_init(&n->rx_pkt);
if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
- virtio_net_load_ebpf(n);
+ virtio_net_load_ebpf(n, errp);
}
}
@@ -3900,6 +3942,7 @@ static Property virtio_net_properties[] = {
VIRTIO_NET_F_RSS, false),
DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
VIRTIO_NET_F_HASH_REPORT, false),
+ DEFINE_PROP_STRING("ebpf_rss_fds", VirtIONet, ebpf_rss_fds),
DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
VIRTIO_NET_F_RSC_EXT, false),
DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index ef234ffe7ef..e10ce88f918 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -219,6 +219,7 @@ struct VirtIONet {
VirtioNetRssData rss_data;
struct NetRxPkt *rx_pkt;
struct EBPFRSSContext ebpf_rss;
+ char *ebpf_rss_fds;
};
size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
--
2.39.1
^ permalink raw reply related [flat|nested] 26+ messages in thread
* [PATCH v2 4/6] ebpf: Added declaration/initialization routines.
2023-05-12 12:28 [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnychenko
` (2 preceding siblings ...)
2023-05-12 12:28 ` [PATCH v2 3/6] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
@ 2023-05-12 12:29 ` Andrew Melnychenko
2023-05-15 9:44 ` Daniel P. Berrangé
2023-05-12 12:29 ` [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
` (2 subsequent siblings)
6 siblings, 1 reply; 26+ messages in thread
From: Andrew Melnychenko @ 2023-05-12 12:29 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
Now, the binary objects may be retrieved by id.
It would require for future qmp commands that may require specific
eBPF blob.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/ebpf.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
ebpf/ebpf.h | 31 +++++++++++++++++++++++++++
ebpf/ebpf_rss.c | 5 +++++
ebpf/meson.build | 1 +
4 files changed, 91 insertions(+)
create mode 100644 ebpf/ebpf.c
create mode 100644 ebpf/ebpf.h
diff --git a/ebpf/ebpf.c b/ebpf/ebpf.c
new file mode 100644
index 00000000000..8870a9b3f50
--- /dev/null
+++ b/ebpf/ebpf.c
@@ -0,0 +1,54 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/queue.h"
+#include "qapi/error.h"
+#include "ebpf/ebpf.h"
+
+struct ElfBinaryDataEntry {
+ int id;
+ const void *data;
+ size_t datalen;
+
+ QSLIST_ENTRY(ElfBinaryDataEntry) node;
+};
+
+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;
+}
diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
new file mode 100644
index 00000000000..b6266b28b8c
--- /dev/null
+++ b/ebpf/ebpf.h
@@ -0,0 +1,31 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
+
+#ifndef EBPF_H
+#define EBPF_H
+
+struct Error;
+
+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 24bc6cc409e..213a8ac79ad 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -13,6 +13,7 @@
#include "qemu/osdep.h"
#include "qemu/error-report.h"
+#include "qapi/qapi-types-misc.h"
#include <bpf/libbpf.h>
#include <bpf/bpf.h>
@@ -21,6 +22,8 @@
#include "ebpf/ebpf_rss.h"
#include "ebpf/rss.bpf.skeleton.h"
+#include "ebpf/ebpf.h"
+
#include "trace.h"
void ebpf_rss_init(struct EBPFRSSContext *ctx)
@@ -261,3 +264,5 @@ 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 2dd0fd89480..67c3f53aa9d 100644
--- a/ebpf/meson.build
+++ b/ebpf/meson.build
@@ -1 +1,2 @@
+softmmu_ss.add(files('ebpf.c'))
softmmu_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
--
2.39.1
^ permalink raw reply related [flat|nested] 26+ messages in thread
* [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-12 12:28 [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnychenko
` (3 preceding siblings ...)
2023-05-12 12:29 ` [PATCH v2 4/6] ebpf: Added declaration/initialization routines Andrew Melnychenko
@ 2023-05-12 12:29 ` Andrew Melnychenko
2023-05-15 9:50 ` Daniel P. Berrangé
2023-05-12 12:29 ` [PATCH v2 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
2023-05-12 12:31 ` [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnichenko
6 siblings, 1 reply; 26+ messages in thread
From: Andrew Melnychenko @ 2023-05-12 12:29 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
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>
---
monitor/qmp-cmds.c | 16 ++++++++++++++++
qapi/misc.json | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 54 insertions(+)
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index b0f948d3376..259bc87ccb1 100644
--- a/monitor/qmp-cmds.c
+++ b/monitor/qmp-cmds.c
@@ -32,6 +32,7 @@
#include "hw/mem/memory-device.h"
#include "hw/intc/intc.h"
#include "hw/rdma/rdma.h"
+#include "ebpf/ebpf.h"
NameInfo *qmp_query_name(Error **errp)
{
@@ -209,3 +210,18 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
qmp_marshal_qmp_capabilities,
QCO_ALLOW_PRECONFIG, 0);
}
+
+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/qapi/misc.json b/qapi/misc.json
index 6ddd16ea283..e96dac8482b 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -618,3 +618,41 @@
{ 'event': 'VFU_CLIENT_HANGUP',
'data': { 'vfu-id': 'str', 'vfu-qom-path': 'str',
'dev-id': 'str', 'dev-qom-path': 'str' } }
+
+##
+# @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.
+#
+# Since: 8.1
+##
+{ 'enum': 'EbpfProgramID',
+ 'data': [ { 'name': 'rss', 'if': 'CONFIG_EBPF' } ] }
+
+##
+# @request-ebpf:
+#
+# Function 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.
+#
+# Returns: RSS eBPF object encoded in base64.
+#
+# Since: 8.1
+#
+##
+{ 'command': 'request-ebpf',
+ 'data': { 'id': 'EbpfProgramID' },
+ 'returns': 'EbpfObject' }
+
--
2.39.1
^ permalink raw reply related [flat|nested] 26+ messages in thread
* [PATCH v2 6/6] ebpf: Updated eBPF program and skeleton.
2023-05-12 12:28 [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnychenko
` (4 preceding siblings ...)
2023-05-12 12:29 ` [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
@ 2023-05-12 12:29 ` Andrew Melnychenko
2023-05-15 9:53 ` Daniel P. Berrangé
2023-05-16 21:29 ` Eric Blake
2023-05-12 12:31 ` [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnichenko
6 siblings, 2 replies; 26+ messages in thread
From: Andrew Melnychenko @ 2023-05-12 12:29 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
Updated section name, so libbpf should init/gues proper
program type without specifications during open/load.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++++++-------------------
tools/ebpf/rss.bpf.c | 2 +-
2 files changed, 741 insertions(+), 730 deletions(-)
diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
index 18eb2adb12c..41b84aea44c 100644
--- a/ebpf/rss.bpf.skeleton.h
+++ b/ebpf/rss.bpf.skeleton.h
@@ -176,162 +176,162 @@ err:
static inline const void *rss_bpf__elf_bytes(size_t *sz)
{
- *sz = 20440;
+ *sz = 20720;
return (const void *)"\
\x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\x98\x4c\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
-\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x54\xff\0\0\0\0\xbf\xa7\
-\0\0\0\0\0\0\x07\x07\0\0\x54\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\xb0\x4d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
+\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x4c\xff\0\0\0\0\xbf\xa7\
+\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x08\0\0\0\0\0\0\
-\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x67\x02\0\0\0\0\xbf\x87\0\0\
-\0\0\0\0\x15\x07\x65\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
-\0\x5e\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc8\xff\0\0\0\0\x7b\x1a\xc0\xff\
-\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\
-\0\x63\x1a\xa0\xff\0\0\0\0\x7b\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\
-\x1a\x88\xff\0\0\0\0\x7b\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\
-\x70\xff\0\0\0\0\x7b\x1a\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\
-\xff\0\0\0\0\x15\x09\x4d\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
-\0\x07\x03\0\0\xd0\xff\xff\xff\xbf\x91\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
+\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x64\x02\0\0\0\0\xbf\x87\0\0\
+\0\0\0\0\x15\x07\x62\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
+\0\x5b\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc0\xff\0\0\0\0\x7b\x1a\xb8\xff\
+\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x7b\x1a\xa0\xff\0\0\0\
+\0\x63\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\x1a\x88\xff\0\0\0\0\x7b\
+\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\x70\xff\0\0\0\0\x7b\x1a\
+\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\xff\0\0\0\0\x7b\x1a\x50\
+\xff\0\0\0\0\x15\x09\x4a\x02\0\0\0\0\x6b\x1a\xc8\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
+\0\x07\x03\0\0\xc8\xff\xff\xff\xbf\x91\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
\x04\0\0\x02\0\0\0\xb7\x05\0\0\0\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\
-\x77\0\0\0\x20\0\0\0\x55\0\x42\x02\0\0\0\0\xb7\x02\0\0\x10\0\0\0\x69\xa1\xd0\
+\x77\0\0\0\x20\0\0\0\x55\0\x3f\x02\0\0\0\0\xb7\x02\0\0\x10\0\0\0\x69\xa1\xc8\
\xff\0\0\0\0\xbf\x13\0\0\0\0\0\0\xdc\x03\0\0\x10\0\0\0\x15\x03\x02\0\0\x81\0\0\
\x55\x03\x0b\0\xa8\x88\0\0\xb7\x02\0\0\x14\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\
-\0\xd0\xff\xff\xff\xbf\x91\0\0\0\0\0\0\xb7\x04\0\0\x02\0\0\0\xb7\x05\0\0\0\0\0\
-\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\x32\x02\0\
-\0\0\0\x69\xa1\xd0\xff\0\0\0\0\x15\x01\x30\x02\0\0\0\0\x7b\x7a\x38\xff\0\0\0\0\
-\x7b\x9a\x40\xff\0\0\0\0\x15\x01\x55\0\x86\xdd\0\0\x55\x01\x39\0\x08\0\0\0\xb7\
-\x07\0\0\x01\0\0\0\x73\x7a\x58\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xe0\xff\
-\0\0\0\0\x7b\x1a\xd8\xff\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\
-\x07\x03\0\0\xd0\xff\xff\xff\x79\xa1\x40\xff\0\0\0\0\xb7\x02\0\0\0\0\0\0\xb7\
+\0\xc8\xff\xff\xff\xbf\x91\0\0\0\0\0\0\xb7\x04\0\0\x02\0\0\0\xb7\x05\0\0\0\0\0\
+\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\x2f\x02\0\
+\0\0\0\x69\xa1\xc8\xff\0\0\0\0\x15\x01\x2d\x02\0\0\0\0\x7b\x7a\x30\xff\0\0\0\0\
+\x7b\x9a\x38\xff\0\0\0\0\x15\x01\x55\0\x86\xdd\0\0\x55\x01\x39\0\x08\0\0\0\xb7\
+\x07\0\0\x01\0\0\0\x73\x7a\x50\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xd8\xff\
+\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\x7b\x1a\xc8\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\
+\x07\x03\0\0\xc8\xff\xff\xff\x79\xa1\x38\xff\0\0\0\0\xb7\x02\0\0\0\0\0\0\xb7\
\x04\0\0\x14\0\0\0\xb7\x05\0\0\x01\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\
-\0\x77\0\0\0\x20\0\0\0\x55\0\x1c\x02\0\0\0\0\x69\xa1\xd6\xff\0\0\0\0\x55\x01\
-\x01\0\0\0\0\0\xb7\x07\0\0\0\0\0\0\x61\xa1\xdc\xff\0\0\0\0\x63\x1a\x64\xff\0\0\
-\0\0\x61\xa1\xe0\xff\0\0\0\0\x63\x1a\x68\xff\0\0\0\0\x71\xa9\xd9\xff\0\0\0\0\
-\x73\x7a\x5e\xff\0\0\0\0\x71\xa1\xd0\xff\0\0\0\0\x67\x01\0\0\x02\0\0\0\x57\x01\
-\0\0\x3c\0\0\0\x7b\x1a\x48\xff\0\0\0\0\xbf\x91\0\0\0\0\0\0\x57\x01\0\0\xff\0\0\
+\0\x77\0\0\0\x20\0\0\0\x55\0\x19\x02\0\0\0\0\x69\xa1\xce\xff\0\0\0\0\x55\x01\
+\x01\0\0\0\0\0\xb7\x07\0\0\0\0\0\0\x61\xa1\xd4\xff\0\0\0\0\x63\x1a\x5c\xff\0\0\
+\0\0\x61\xa1\xd8\xff\0\0\0\0\x63\x1a\x60\xff\0\0\0\0\x71\xa9\xd1\xff\0\0\0\0\
+\x73\x7a\x56\xff\0\0\0\0\x71\xa1\xc8\xff\0\0\0\0\x67\x01\0\0\x02\0\0\0\x57\x01\
+\0\0\x3c\0\0\0\x7b\x1a\x40\xff\0\0\0\0\xbf\x91\0\0\0\0\0\0\x57\x01\0\0\xff\0\0\
\0\x15\x01\x19\0\0\0\0\0\x57\x07\0\0\xff\0\0\0\x55\x07\x17\0\0\0\0\0\x57\x09\0\
\0\xff\0\0\0\x15\x09\x5a\x01\x11\0\0\0\x55\x09\x14\0\x06\0\0\0\xb7\x01\0\0\x01\
-\0\0\0\x73\x1a\x5b\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xe0\xff\0\0\0\0\x7b\
-\x1a\xd8\xff\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\
-\xd0\xff\xff\xff\x79\xa1\x40\xff\0\0\0\0\x79\xa2\x48\xff\0\0\0\0\xb7\x04\0\0\
+\0\0\0\x73\x1a\x53\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xd8\xff\0\0\0\0\x7b\
+\x1a\xd0\xff\0\0\0\0\x7b\x1a\xc8\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\
+\xc8\xff\xff\xff\x79\xa1\x38\xff\0\0\0\0\x79\xa2\x40\xff\0\0\0\0\xb7\x04\0\0\
\x14\0\0\0\xb7\x05\0\0\x01\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\
-\0\0\x20\0\0\0\x55\0\xf7\x01\0\0\0\0\x69\xa1\xd0\xff\0\0\0\0\x6b\x1a\x60\xff\0\
-\0\0\0\x69\xa1\xd2\xff\0\0\0\0\x6b\x1a\x62\xff\0\0\0\0\x71\xa1\x58\xff\0\0\0\0\
+\0\0\x20\0\0\0\x55\0\xf4\x01\0\0\0\0\x69\xa1\xc8\xff\0\0\0\0\x6b\x1a\x58\xff\0\
+\0\0\0\x69\xa1\xca\xff\0\0\0\0\x6b\x1a\x5a\xff\0\0\0\0\x71\xa1\x50\xff\0\0\0\0\
\x15\x01\xdb\0\0\0\0\0\x71\x62\x03\0\0\0\0\0\x67\x02\0\0\x08\0\0\0\x71\x61\x02\
\0\0\0\0\0\x4f\x12\0\0\0\0\0\0\x71\x63\x04\0\0\0\0\0\x71\x61\x05\0\0\0\0\0\x67\
\x01\0\0\x08\0\0\0\x4f\x31\0\0\0\0\0\0\x67\x01\0\0\x10\0\0\0\x4f\x21\0\0\0\0\0\
-\0\x71\xa2\x5b\xff\0\0\0\0\x79\xa0\x38\xff\0\0\0\0\x15\x02\x0c\x01\0\0\0\0\xbf\
-\x12\0\0\0\0\0\0\x57\x02\0\0\x02\0\0\0\x15\x02\x09\x01\0\0\0\0\x61\xa1\x64\xff\
-\0\0\0\0\x63\x1a\xa8\xff\0\0\0\0\x61\xa1\x68\xff\0\0\0\0\x63\x1a\xac\xff\0\0\0\
-\0\x69\xa1\x60\xff\0\0\0\0\x6b\x1a\xb0\xff\0\0\0\0\x69\xa1\x62\xff\0\0\0\0\x6b\
-\x1a\xb2\xff\0\0\0\0\x05\0\x6b\x01\0\0\0\0\xb7\x01\0\0\x01\0\0\0\x73\x1a\x59\
-\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\x1a\xf0\xff\0\0\0\0\x7b\x1a\xe8\xff\0\0\0\
-\0\x7b\x1a\xe0\xff\0\0\0\0\x7b\x1a\xd8\xff\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\xbf\
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\0\0\0\xb7\x03\0\0\x10\0\0\0\x15\x01\x01\0\0\0\0\0\xb7\x03\0\0\x30\0\0\0\x71\
-\xa4\x5d\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\0\0\0\0\0\0\xbf\xa3\0\0\0\0\
-\0\0\x07\x03\0\0\x64\xff\xff\xff\xbf\x34\0\0\0\0\0\0\x15\x01\x02\0\0\0\0\0\xbf\
-\xa4\0\0\0\0\0\0\x07\x04\0\0\x84\xff\xff\xff\x71\xa5\x5c\xff\0\0\0\0\xbf\x31\0\
+\xa4\x55\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\0\0\0\0\0\0\xbf\xa3\0\0\0\0\
+\0\0\x07\x03\0\0\x5c\xff\xff\xff\xbf\x34\0\0\0\0\0\0\x15\x01\x02\0\0\0\0\0\xbf\
+\xa4\0\0\0\0\0\0\x07\x04\0\0\x7c\xff\xff\xff\x71\xa5\x54\xff\0\0\0\0\xbf\x31\0\
\0\0\0\0\0\x15\x05\x01\0\0\0\0\0\xbf\x41\0\0\0\0\0\0\x61\x14\x04\0\0\0\0\0\x67\
-\x04\0\0\x20\0\0\0\x61\x15\0\0\0\0\0\0\x4f\x54\0\0\0\0\0\0\x7b\x4a\xa8\xff\0\0\
+\x04\0\0\x20\0\0\0\x61\x15\0\0\0\0\0\0\x4f\x54\0\0\0\0\0\0\x7b\x4a\xa0\xff\0\0\
\0\0\x61\x14\x08\0\0\0\0\0\x61\x11\x0c\0\0\0\0\0\x67\x01\0\0\x20\0\0\0\x4f\x41\
-\0\0\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x0f\x23\0\0\0\0\0\0\x61\x31\0\0\0\0\0\0\
-\x61\x32\x04\0\0\0\0\0\x61\x34\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x69\xa5\x62\
-\xff\0\0\0\0\x6b\x5a\xca\xff\0\0\0\0\x69\xa5\x60\xff\0\0\0\0\x6b\x5a\xc8\xff\0\
-\0\0\0\x67\x03\0\0\x20\0\0\0\x4f\x43\0\0\0\0\0\0\x7b\x3a\xc0\xff\0\0\0\0\x67\
-\x02\0\0\x20\0\0\0\x4f\x12\0\0\0\0\0\0\x7b\x2a\xb8\xff\0\0\0\0\x05\0\x6b\0\0\0\
-\0\0\x71\xa2\x5a\xff\0\0\0\0\x15\x02\x04\0\0\0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\
+\0\0\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x0f\x23\0\0\0\0\0\0\x61\x31\0\0\0\0\0\0\
+\x61\x32\x04\0\0\0\0\0\x61\x34\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x69\xa5\x5a\
+\xff\0\0\0\0\x6b\x5a\xc2\xff\0\0\0\0\x69\xa5\x58\xff\0\0\0\0\x6b\x5a\xc0\xff\0\
+\0\0\0\x67\x03\0\0\x20\0\0\0\x4f\x43\0\0\0\0\0\0\x7b\x3a\xb8\xff\0\0\0\0\x67\
+\x02\0\0\x20\0\0\0\x4f\x12\0\0\0\0\0\0\x7b\x2a\xb0\xff\0\0\0\0\x05\0\x6b\0\0\0\
+\0\0\x71\xa2\x52\xff\0\0\0\0\x15\x02\x04\0\0\0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\
\0\0\x04\0\0\0\x15\x02\x01\0\0\0\0\0\x05\0\xf1\xfe\0\0\0\0\x57\x01\0\0\x01\0\0\
-\0\x15\x01\xd0\0\0\0\0\0\x61\xa1\x64\xff\0\0\0\0\x63\x1a\xa8\xff\0\0\0\0\x61\
-\xa1\x68\xff\0\0\0\0\x63\x1a\xac\xff\0\0\0\0\x05\0\x5e\0\0\0\0\0\xb7\x09\0\0\
-\x3c\0\0\0\x79\xa8\x28\xff\0\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x15\
-\0\xac\xff\0\0\0\0\x05\0\xc5\0\0\0\0\0\x71\xa2\x5a\xff\0\0\0\0\x15\x02\x26\0\0\
+\0\x15\x01\xcd\0\0\0\0\0\x61\xa1\x5c\xff\0\0\0\0\x63\x1a\xa0\xff\0\0\0\0\x61\
+\xa1\x60\xff\0\0\0\0\x63\x1a\xa4\xff\0\0\0\0\x05\0\x5e\0\0\0\0\0\xb7\x09\0\0\
+\x3c\0\0\0\x79\xa8\x20\xff\0\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x15\
+\0\xac\xff\0\0\0\0\x05\0\xc2\0\0\0\0\0\x71\xa2\x52\xff\0\0\0\0\x15\x02\x26\0\0\
\0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x20\0\0\0\x15\x02\x23\0\0\0\0\0\x57\x01\
\0\0\0\x01\0\0\xb7\x02\0\0\x10\0\0\0\xb7\x03\0\0\x10\0\0\0\x15\x01\x01\0\0\0\0\
-\0\xb7\x03\0\0\x30\0\0\0\x71\xa4\x5d\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\
-\0\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x64\xff\xff\xff\xbf\x34\0\0\0\0\0\
-\0\x15\x01\x02\0\0\0\0\0\xbf\xa4\0\0\0\0\0\0\x07\x04\0\0\x84\xff\xff\xff\x71\
-\xa5\x5c\xff\0\0\0\0\xbf\x31\0\0\0\0\0\0\x15\x05\xbd\xff\0\0\0\0\x05\0\xbb\xff\
-\0\0\0\0\xb7\x01\0\0\x01\0\0\0\x73\x1a\x5a\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\
-\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\xd0\xff\xff\xff\x79\xa1\
-\x40\xff\0\0\0\0\x79\xa2\x48\xff\0\0\0\0\xb7\x04\0\0\x08\0\0\0\xb7\x05\0\0\x01\
-\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\xa0\0\
+\0\xb7\x03\0\0\x30\0\0\0\x71\xa4\x55\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\
+\0\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x5c\xff\xff\xff\xbf\x34\0\0\0\0\0\
+\0\x15\x01\x02\0\0\0\0\0\xbf\xa4\0\0\0\0\0\0\x07\x04\0\0\x7c\xff\xff\xff\x71\
+\xa5\x54\xff\0\0\0\0\xbf\x31\0\0\0\0\0\0\x15\x05\xbd\xff\0\0\0\0\x05\0\xbb\xff\
+\0\0\0\0\xb7\x01\0\0\x01\0\0\0\x73\x1a\x52\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\
+\x1a\xc8\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\xc8\xff\xff\xff\x79\xa1\
+\x38\xff\0\0\0\0\x79\xa2\x40\xff\0\0\0\0\xb7\x04\0\0\x08\0\0\0\xb7\x05\0\0\x01\
+\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\x9d\0\
\0\0\0\0\x05\0\xa8\xfe\0\0\0\0\x15\x09\xf3\xfe\x87\0\0\0\x05\0\x83\xff\0\0\0\0\
-\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x08\0\0\0\x15\x02\x9a\0\0\0\0\0\x57\x01\0\0\
+\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x08\0\0\0\x15\x02\x97\0\0\0\0\0\x57\x01\0\0\
\x40\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\x03\0\0\x0c\0\0\0\x15\x01\x01\0\0\0\0\0\
-\xb7\x03\0\0\x2c\0\0\0\x71\xa4\x5c\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\0\
-\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x58\xff\xff\xff\x0f\x23\0\0\0\0\0\0\
+\xb7\x03\0\0\x2c\0\0\0\x71\xa4\x54\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\0\
+\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x50\xff\xff\xff\x0f\x23\0\0\0\0\0\0\
\x61\x32\x04\0\0\0\0\0\x67\x02\0\0\x20\0\0\0\x61\x34\0\0\0\0\0\0\x4f\x42\0\0\0\
-\0\0\0\x7b\x2a\xa8\xff\0\0\0\0\x61\x32\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x67\
-\x03\0\0\x20\0\0\0\x4f\x23\0\0\0\0\0\0\x7b\x3a\xb0\xff\0\0\0\0\x71\xa2\x5d\xff\
-\0\0\0\0\x15\x02\x0c\0\0\0\0\0\x15\x01\x0b\0\0\0\0\0\x61\xa1\xa0\xff\0\0\0\0\
-\x67\x01\0\0\x20\0\0\0\x61\xa2\x9c\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xc0\
-\xff\0\0\0\0\x61\xa1\x98\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x94\xff\0\0\
+\0\0\0\x7b\x2a\xa0\xff\0\0\0\0\x61\x32\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x67\
+\x03\0\0\x20\0\0\0\x4f\x23\0\0\0\0\0\0\x7b\x3a\xa8\xff\0\0\0\0\x71\xa2\x55\xff\
+\0\0\0\0\x15\x02\x0c\0\0\0\0\0\x15\x01\x0b\0\0\0\0\0\x61\xa1\x98\xff\0\0\0\0\
+\x67\x01\0\0\x20\0\0\0\x61\xa2\x94\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb8\
+\xff\0\0\0\0\x61\xa1\x90\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x8c\xff\0\0\
\0\0\x05\0\x0a\0\0\0\0\0\xb7\x09\0\0\x2b\0\0\0\x05\0\xae\xff\0\0\0\0\x61\xa1\
-\x80\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x7c\xff\0\0\0\0\x4f\x21\0\0\0\0\
-\0\0\x7b\x1a\xc0\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\
-\xa2\x74\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\xb7\x02\0\0\0\
+\x78\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x74\xff\0\0\0\0\x4f\x21\0\0\0\0\
+\0\0\x7b\x1a\xb8\xff\0\0\0\0\x61\xa1\x70\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\
+\xa2\x6c\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\xb7\x02\0\0\0\
\0\0\0\x07\x08\0\0\x04\0\0\0\x61\x03\0\0\0\0\0\0\xb7\x05\0\0\0\0\0\0\xbf\xa1\0\
-\0\0\0\0\0\x07\x01\0\0\xa8\xff\xff\xff\x0f\x21\0\0\0\0\0\0\x71\x14\0\0\0\0\0\0\
+\0\0\0\0\0\x07\x01\0\0\xa0\xff\xff\xff\x0f\x21\0\0\0\0\0\0\x71\x14\0\0\0\0\0\0\
\xbf\x41\0\0\0\0\0\0\x67\x01\0\0\x38\0\0\0\xc7\x01\0\0\x3f\0\0\0\x5f\x31\0\0\0\
\0\0\0\xaf\x51\0\0\0\0\0\0\xbf\x85\0\0\0\0\0\0\x0f\x25\0\0\0\0\0\0\x71\x55\0\0\
\0\0\0\0\x67\x03\0\0\x01\0\0\0\xbf\x50\0\0\0\0\0\0\x77\0\0\0\x07\0\0\0\x4f\x03\
@@ -353,619 +353,630 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
\0\x57\0\0\0\x01\0\0\0\x67\x03\0\0\x01\0\0\0\x4f\x03\0\0\0\0\0\0\x57\x04\0\0\
\x01\0\0\0\x87\x04\0\0\0\0\0\0\x5f\x34\0\0\0\0\0\0\xaf\x41\0\0\0\0\0\0\x57\x05\
\0\0\x01\0\0\0\x67\x03\0\0\x01\0\0\0\x4f\x53\0\0\0\0\0\0\x07\x02\0\0\x01\0\0\0\
-\xbf\x15\0\0\0\0\0\0\x15\x02\x01\0\x24\0\0\0\x05\0\xa9\xff\0\0\0\0\xbf\x12\0\0\
-\0\0\0\0\x67\x02\0\0\x20\0\0\0\x77\x02\0\0\x20\0\0\0\x15\x02\x0e\0\0\0\0\0\x71\
-\x63\x06\0\0\0\0\0\x71\x64\x07\0\0\0\0\0\x67\x04\0\0\x08\0\0\0\x4f\x34\0\0\0\0\
-\0\0\x3f\x42\0\0\0\0\0\0\x2f\x42\0\0\0\0\0\0\x1f\x21\0\0\0\0\0\0\x63\x1a\x58\
-\xff\0\0\0\0\xbf\xa2\0\0\0\0\0\0\x07\x02\0\0\x58\xff\xff\xff\x18\x01\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\x55\0\x05\0\0\0\0\0\x71\x61\x08\0\0\0\0\
-\0\x71\x60\x09\0\0\0\0\0\x67\0\0\0\x08\0\0\0\x4f\x10\0\0\0\0\0\0\x95\0\0\0\0\0\
-\0\0\x69\0\0\0\0\0\0\0\x05\0\xfd\xff\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\xbf\x15\0\0\0\0\0\0\x15\x02\x01\0\x24\0\0\0\x05\0\xa9\xff\0\0\0\0\x67\x01\0\0\
+\x20\0\0\0\x77\x01\0\0\x20\0\0\0\x15\x01\x0c\0\0\0\0\0\x71\x62\x06\0\0\0\0\0\
+\x71\x63\x07\0\0\0\0\0\x67\x03\0\0\x08\0\0\0\x4f\x23\0\0\0\0\0\0\x9f\x31\0\0\0\
+\0\0\0\x63\x1a\x50\xff\0\0\0\0\xbf\xa2\0\0\0\0\0\0\x07\x02\0\0\x50\xff\xff\xff\
+\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\x55\0\x05\0\0\0\0\0\
+\x71\x61\x08\0\0\0\0\0\x71\x60\x09\0\0\0\0\0\x67\0\0\0\x08\0\0\0\x4f\x10\0\0\0\
+\0\0\0\x95\0\0\0\0\0\0\0\x69\0\0\0\0\0\0\0\x05\0\xfd\xff\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\x47\x50\x4c\x20\x76\x32\0\0\x9f\xeb\x01\0\x18\0\0\0\0\0\0\0\x10\x05\0\0\x10\
-\x05\0\0\x65\x11\0\0\0\0\0\0\0\0\0\x02\x03\0\0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\
-\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x02\0\0\0\x05\0\0\0\
-\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\x02\x06\0\0\0\0\0\0\0\0\0\0\x03\0\
-\0\0\0\x02\0\0\0\x04\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\x02\x08\0\0\0\0\0\0\0\0\0\0\
-\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x0a\0\0\0\0\0\0\0\0\0\0\x02\x0a\0\0\0\0\0\0\0\
-\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x01\0\0\0\0\0\0\0\x04\0\0\x04\x20\0\0\0\
-\x19\0\0\0\x01\0\0\0\0\0\0\0\x1e\0\0\0\x05\0\0\0\x40\0\0\0\x27\0\0\0\x07\0\0\0\
-\x80\0\0\0\x32\0\0\0\x09\0\0\0\xc0\0\0\0\x3e\0\0\0\0\0\0\x0e\x0b\0\0\0\x01\0\0\
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\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xae\0\0\0\x03\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x25\x4a\0\0\0\0\0\0\x6d\x02\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x1a\0\0\0\x01\0\0\0\x06\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\x68\0\0\0\x01\0\0\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\x40\0\0\0\0\0\0\0\xe0\x13\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\x64\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\x3d\0\0\
-\0\0\0\0\x30\0\0\0\0\0\0\0\x0c\0\0\0\x03\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\
-\0\0\x2d\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x20\x14\0\0\0\0\0\0\
-\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x88\0\0\0\
-\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x80\x14\0\0\0\0\0\0\x07\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xc2\0\0\0\x01\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x88\x14\0\0\0\0\0\0\x8d\x16\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xbe\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\x70\x3d\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\x0c\0\0\0\x07\0\0\0\x08\
-\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x24\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\x18\x2b\0\0\0\0\0\0\xa0\x0c\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\x20\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb0\
-\x3d\0\0\0\0\0\0\x70\x0c\0\0\0\0\0\0\x0c\0\0\0\x09\0\0\0\x08\0\0\0\0\0\0\0\x10\
-\0\0\0\0\0\0\0\x79\0\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\x20\
-\x4a\0\0\0\0\0\0\x05\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\xb6\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb8\x37\0\0\0\0\0\0\
-\x88\x05\0\0\0\0\0\0\x01\0\0\0\x36\0\0\0\x08\0\0\0\0\0\0\0\x18\0\0\0\0\0\0\0";
+\0\xa4\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x55\x4b\0\0\0\0\0\0\x5b\
+\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x1a\0\0\0\
+\x01\0\0\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x31\0\0\0\x01\0\0\0\x06\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\xc8\x13\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x2d\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\xc0\x3d\0\0\0\0\0\0\x30\0\0\0\0\0\0\0\x0c\0\0\0\x03\0\0\0\x08\0\0\
+\0\0\0\0\0\x10\0\0\0\0\0\0\0\x38\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\x08\x14\0\0\0\0\0\0\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\x7e\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x68\x14\0\
+\0\0\0\0\0\x07\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\xb8\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x70\x14\0\0\0\0\0\0\x89\
+\x16\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb4\0\0\0\
+\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xf0\x3d\0\0\0\0\0\0\x40\0\0\0\0\0\
+\0\0\x0c\0\0\0\x07\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x24\0\0\0\x01\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xfc\x2a\0\0\0\0\0\0\x50\x0d\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x20\0\0\0\x09\0\0\0\x40\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x30\x3e\0\0\0\0\0\0\x20\x0d\0\0\0\0\0\0\x0c\0\0\0\x09\0\
+\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x6f\0\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\
+\0\0\0\0\0\0\0\0\0\0\0\x50\x4b\0\0\0\0\0\0\x05\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xac\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\x50\x38\0\0\0\0\0\0\x70\x05\0\0\0\0\0\0\x01\0\0\0\x35\0\0\0\x08\0\0\0\
+\0\0\0\0\x18\0\0\0\0\0\0\0";
}
#ifdef __cplusplus
diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
index 20f227e2acc..d32b6fb42a4 100644
--- a/tools/ebpf/rss.bpf.c
+++ b/tools/ebpf/rss.bpf.c
@@ -528,7 +528,7 @@ static inline __u32 calculate_rss_hash(struct __sk_buff *skb,
return result;
}
-SEC("tun_rss_steering")
+SEC("socket")
int tun_rss_steering_prog(struct __sk_buff *skb)
{
--
2.39.1
^ permalink raw reply related [flat|nested] 26+ messages in thread
* Re: [PATCH v2 0/6] eBPF RSS through QMP support.
2023-05-12 12:28 [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnychenko
` (5 preceding siblings ...)
2023-05-12 12:29 ` [PATCH v2 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
@ 2023-05-12 12:31 ` Andrew Melnichenko
6 siblings, 0 replies; 26+ messages in thread
From: Andrew Melnichenko @ 2023-05-12 12:31 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
Hi all,
Also, a possible solution for libvirt may look like this:
https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
On Fri, May 12, 2023 at 3:47 PM Andrew Melnychenko <andrew@daynix.com> wrote:
>
> This series of patches provides the ability to retrieve eBPF program
> through qmp, so management application may load bpf blob with proper capabilities.
> Now, virtio-net devices can accept eBPF programs and maps through properties
> as external file descriptors. Access to the eBPF map is direct through mmap()
> call, so it should not require additional capabilities to bpf* calls.
> eBPF file descriptors can be passed to QEMU from parent process or by unix
> socket with sendfd() qmp command.
>
> Changes since v1:
> * refactored code.
> * eBPF program ids implemented as enums
>
> Andrew Melnychenko (6):
> ebpf: Added eBPF map update through mmap.
> ebpf: Added eBPF initialization by fds.
> virtio-net: Added property to load eBPF RSS with fds.
> ebpf: Added declaration/initialization routines.
> qmp: Added new command to retrieve eBPF blob.
> ebpf: Updated eBPF program and skeleton.
>
> ebpf/ebpf.c | 54 ++
> ebpf/ebpf.h | 31 +
> ebpf/ebpf_rss-stub.c | 6 +
> ebpf/ebpf_rss.c | 149 +++-
> ebpf/ebpf_rss.h | 10 +
> ebpf/meson.build | 1 +
> ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++----------------
> hw/net/virtio-net.c | 55 +-
> include/hw/virtio/virtio-net.h | 1 +
> monitor/qmp-cmds.c | 16 +
> qapi/misc.json | 38 +
> tools/ebpf/rss.bpf.c | 2 +-
> 12 files changed, 1073 insertions(+), 759 deletions(-)
> create mode 100644 ebpf/ebpf.c
> create mode 100644 ebpf/ebpf.h
>
> --
> 2.39.1
>
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 1/6] ebpf: Added eBPF map update through mmap.
2023-05-12 12:28 ` [PATCH v2 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
@ 2023-05-15 9:34 ` Daniel P. Berrangé
0 siblings, 0 replies; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-15 9:34 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Fri, May 12, 2023 at 03:28:57PM +0300, Andrew Melnychenko wrote:
> Changed eBPF map updates through mmaped array.
> Mmaped arrays provide direct access to map data.
> It should omit using bpf_map_update_elem() call,
> which may require capabilities that are not present.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/ebpf_rss.c | 117 ++++++++++++++++++++++++++++++++++++++----------
> ebpf/ebpf_rss.h | 5 +++
> 2 files changed, 99 insertions(+), 23 deletions(-)
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 2/6] ebpf: Added eBPF initialization by fds.
2023-05-12 12:28 ` [PATCH v2 2/6] ebpf: Added eBPF initialization by fds Andrew Melnychenko
@ 2023-05-15 9:35 ` Daniel P. Berrangé
0 siblings, 0 replies; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-15 9:35 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Fri, May 12, 2023 at 03:28:58PM +0300, Andrew Melnychenko wrote:
> It allows using file descriptors of eBPF provided
> outside of QEMU.
> QEMU may be run without capabilities for eBPF and run
> RSS program provided by management tool(g.e. libvirt).
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/ebpf_rss-stub.c | 6 ++++++
> ebpf/ebpf_rss.c | 27 +++++++++++++++++++++++++++
> ebpf/ebpf_rss.h | 5 +++++
> 3 files changed, 38 insertions(+)
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 3/6] virtio-net: Added property to load eBPF RSS with fds.
2023-05-12 12:28 ` [PATCH v2 3/6] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
@ 2023-05-15 9:38 ` Daniel P. Berrangé
2023-05-15 10:53 ` Andrew Melnichenko
2023-05-16 21:21 ` Eric Blake
0 siblings, 2 replies; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-15 9:38 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Fri, May 12, 2023 at 03:28:59PM +0300, Andrew Melnychenko wrote:
> eBPF RSS program and maps may now be passed during initialization.
> Initially was implemented for libvirt to launch qemu without permissions,
> and initialized eBPF program through the helper.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> hw/net/virtio-net.c | 55 ++++++++++++++++++++++++++++++----
> include/hw/virtio/virtio-net.h | 1 +
> 2 files changed, 50 insertions(+), 6 deletions(-)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 53e1c326433..a62d7936948 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -42,6 +42,7 @@
> #include "sysemu/sysemu.h"
> #include "trace.h"
> #include "monitor/qdev.h"
> +#include "monitor/monitor.h"
> #include "hw/pci/pci_device.h"
> #include "net_rx_pkt.h"
> #include "hw/virtio/vhost.h"
> @@ -1305,14 +1306,55 @@ static void virtio_net_detach_epbf_rss(VirtIONet *n)
> virtio_net_attach_ebpf_to_backend(n->nic, -1);
> }
>
> -static bool virtio_net_load_ebpf(VirtIONet *n)
> +static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
> {
> - if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> - /* backend does't support steering ebpf */
> - return false;
> + int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
Interesting, I didn't realize this initialization syntax was possible !
> + int nfds = 0;
> + int ret = true;
> + int i = 0;
> + g_autofree char **fds_strs = g_strsplit(n->ebpf_rss_fds, ":", 0)
You can't use 'g_autofree' with 'char **' I'm afraid, as that'll
merely g_free() the array, but not the individual strings.
Needs to be
g_auto(GStrv) fds_strs
GStrv is a typedef for "char **" which gets g_strfreev() attached
as its destructor.
> +
> + ERRP_GUARD();
> +
> + if (g_strv_length(fds_strs) != EBPF_RSS_MAX_FDS) {
> + error_setg(errp,
> + "Expected %d file descriptors but got %d",
> + EBPF_RSS_MAX_FDS, g_strv_length(fds_strs));
> + return false;
> + }
> +
> + for (i = 0; i < nfds; i++) {
> + fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], errp);
> + if (*errp) {
> + ret = false;
> + goto exit;
> + }
> + }
> +
> + ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
> +
> +exit:
> + if (!ret || *errp) {
> + for (i = 0; i < nfds && fds[i] != -1; i++) {
> + close(fds[i]);
> + }
> }
>
> - return ebpf_rss_load(&n->ebpf_rss);
> + return ret;
> +}
> +
> +static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
> +{
> + bool ret = false;
> +
> + if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> + if (!(n->ebpf_rss_fds
> + && virtio_net_load_ebpf_fds(n, errp))) {
> + ret = ebpf_rss_load(&n->ebpf_rss);
> + }
> + }
> +
> + return ret;
> }
>
> static void virtio_net_unload_ebpf(VirtIONet *n)
> @@ -3738,7 +3780,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
> net_rx_pkt_init(&n->rx_pkt);
>
> if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
> - virtio_net_load_ebpf(n);
> + virtio_net_load_ebpf(n, errp);
> }
> }
>
> @@ -3900,6 +3942,7 @@ static Property virtio_net_properties[] = {
> VIRTIO_NET_F_RSS, false),
> DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
> VIRTIO_NET_F_HASH_REPORT, false),
> + DEFINE_PROP_STRING("ebpf_rss_fds", VirtIONet, ebpf_rss_fds),
> DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
> VIRTIO_NET_F_RSC_EXT, false),
> DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
> diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
> index ef234ffe7ef..e10ce88f918 100644
> --- a/include/hw/virtio/virtio-net.h
> +++ b/include/hw/virtio/virtio-net.h
> @@ -219,6 +219,7 @@ struct VirtIONet {
> VirtioNetRssData rss_data;
> struct NetRxPkt *rx_pkt;
> struct EBPFRSSContext ebpf_rss;
> + char *ebpf_rss_fds;
> };
>
> size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
> --
> 2.39.1
>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 4/6] ebpf: Added declaration/initialization routines.
2023-05-12 12:29 ` [PATCH v2 4/6] ebpf: Added declaration/initialization routines Andrew Melnychenko
@ 2023-05-15 9:44 ` Daniel P. Berrangé
0 siblings, 0 replies; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-15 9:44 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Fri, May 12, 2023 at 03:29:00PM +0300, Andrew Melnychenko wrote:
> Now, the binary objects may be retrieved by id.
> It would require for future qmp commands that may require specific
> eBPF blob.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/ebpf.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
> ebpf/ebpf.h | 31 +++++++++++++++++++++++++++
> ebpf/ebpf_rss.c | 5 +++++
> ebpf/meson.build | 1 +
> 4 files changed, 91 insertions(+)
> create mode 100644 ebpf/ebpf.c
> create mode 100644 ebpf/ebpf.h
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-12 12:29 ` [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
@ 2023-05-15 9:50 ` Daniel P. Berrangé
2023-05-16 8:47 ` Markus Armbruster
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-15 9:50 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
Question for Markus at the bottom....
On Fri, May 12, 2023 at 03:29:01PM +0300, Andrew Melnychenko wrote:
> 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>
> ---
> monitor/qmp-cmds.c | 16 ++++++++++++++++
> qapi/misc.json | 38 ++++++++++++++++++++++++++++++++++++++
> 2 files changed, 54 insertions(+)
>
> diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> index b0f948d3376..259bc87ccb1 100644
> --- a/monitor/qmp-cmds.c
> +++ b/monitor/qmp-cmds.c
> @@ -32,6 +32,7 @@
> #include "hw/mem/memory-device.h"
> #include "hw/intc/intc.h"
> #include "hw/rdma/rdma.h"
> +#include "ebpf/ebpf.h"
>
> NameInfo *qmp_query_name(Error **errp)
> {
> @@ -209,3 +210,18 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
> qmp_marshal_qmp_capabilities,
> QCO_ALLOW_PRECONFIG, 0);
> }
> +
> +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/qapi/misc.json b/qapi/misc.json
> index 6ddd16ea283..e96dac8482b 100644
> --- a/qapi/misc.json
> +++ b/qapi/misc.json
> @@ -618,3 +618,41 @@
> { 'event': 'VFU_CLIENT_HANGUP',
> 'data': { 'vfu-id': 'str', 'vfu-qom-path': 'str',
> 'dev-id': 'str', 'dev-qom-path': 'str' } }
> +
> +##
> +# @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.
> +#
> +# Since: 8.1
> +##
> +{ 'enum': 'EbpfProgramID',
> + 'data': [ { 'name': 'rss', 'if': 'CONFIG_EBPF' } ] }
> +
> +##
> +# @request-ebpf:
> +#
> +# Function 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.
> +#
> +# Returns: RSS eBPF object encoded in base64.
> +#
> +# Since: 8.1
> +#
> +##
> +{ 'command': 'request-ebpf',
> + 'data': { 'id': 'EbpfProgramID' },
> + 'returns': 'EbpfObject' }
> +
Fnuctionally this is fine so
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
A question for Markus though - is is perhaps better to mark all the
command/enum/object as conditional on CONFIG_EBPF, rather than just
reporting an empty EbpfProgramID enum when EBPF is disabled at build
time ?
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 6/6] ebpf: Updated eBPF program and skeleton.
2023-05-12 12:29 ` [PATCH v2 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
@ 2023-05-15 9:53 ` Daniel P. Berrangé
2023-05-16 21:29 ` Eric Blake
1 sibling, 0 replies; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-15 9:53 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Fri, May 12, 2023 at 03:29:02PM +0300, Andrew Melnychenko wrote:
> Updated section name, so libbpf should init/gues proper
> program type without specifications during open/load.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++++++-------------------
> tools/ebpf/rss.bpf.c | 2 +-
> 2 files changed, 741 insertions(+), 730 deletions(-)
..snip..
Can't say I've verified the big hex blob, but I'll asume its a faithful
compilation of the change below:
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
> diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
> index 20f227e2acc..d32b6fb42a4 100644
> --- a/tools/ebpf/rss.bpf.c
> +++ b/tools/ebpf/rss.bpf.c
> @@ -528,7 +528,7 @@ static inline __u32 calculate_rss_hash(struct __sk_buff *skb,
> return result;
> }
>
> -SEC("tun_rss_steering")
> +SEC("socket")
> int tun_rss_steering_prog(struct __sk_buff *skb)
> {
>
> --
> 2.39.1
>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 3/6] virtio-net: Added property to load eBPF RSS with fds.
2023-05-15 9:38 ` Daniel P. Berrangé
@ 2023-05-15 10:53 ` Andrew Melnichenko
2023-05-16 21:21 ` Eric Blake
1 sibling, 0 replies; 26+ messages in thread
From: Andrew Melnichenko @ 2023-05-15 10:53 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
Hi all,
On Mon, May 15, 2023 at 12:38 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Fri, May 12, 2023 at 03:28:59PM +0300, Andrew Melnychenko wrote:
> > eBPF RSS program and maps may now be passed during initialization.
> > Initially was implemented for libvirt to launch qemu without permissions,
> > and initialized eBPF program through the helper.
> >
> > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> > ---
> > hw/net/virtio-net.c | 55 ++++++++++++++++++++++++++++++----
> > include/hw/virtio/virtio-net.h | 1 +
> > 2 files changed, 50 insertions(+), 6 deletions(-)
> >
> > diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> > index 53e1c326433..a62d7936948 100644
> > --- a/hw/net/virtio-net.c
> > +++ b/hw/net/virtio-net.c
> > @@ -42,6 +42,7 @@
> > #include "sysemu/sysemu.h"
> > #include "trace.h"
> > #include "monitor/qdev.h"
> > +#include "monitor/monitor.h"
> > #include "hw/pci/pci_device.h"
> > #include "net_rx_pkt.h"
> > #include "hw/virtio/vhost.h"
> > @@ -1305,14 +1306,55 @@ static void virtio_net_detach_epbf_rss(VirtIONet *n)
> > virtio_net_attach_ebpf_to_backend(n->nic, -1);
> > }
> >
> > -static bool virtio_net_load_ebpf(VirtIONet *n)
> > +static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
> > {
> > - if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> > - /* backend does't support steering ebpf */
> > - return false;
> > + int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
>
> Interesting, I didn't realize this initialization syntax was possible !
>
> > + int nfds = 0;
> > + int ret = true;
> > + int i = 0;
> > + g_autofree char **fds_strs = g_strsplit(n->ebpf_rss_fds, ":", 0)
>
> You can't use 'g_autofree' with 'char **' I'm afraid, as that'll
> merely g_free() the array, but not the individual strings.
>
> Needs to be
>
> g_auto(GStrv) fds_strs
>
> GStrv is a typedef for "char **" which gets g_strfreev() attached
> as its destructor.
Oh yeah, I've missed that! Thank you.
>
>
> > +
> > + ERRP_GUARD();
> > +
> > + if (g_strv_length(fds_strs) != EBPF_RSS_MAX_FDS) {
> > + error_setg(errp,
> > + "Expected %d file descriptors but got %d",
> > + EBPF_RSS_MAX_FDS, g_strv_length(fds_strs));
> > + return false;
> > + }
> > +
> > + for (i = 0; i < nfds; i++) {
> > + fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], errp);
> > + if (*errp) {
> > + ret = false;
> > + goto exit;
> > + }
> > + }
> > +
> > + ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
> > +
> > +exit:
> > + if (!ret || *errp) {
> > + for (i = 0; i < nfds && fds[i] != -1; i++) {
> > + close(fds[i]);
> > + }
> > }
> >
> > - return ebpf_rss_load(&n->ebpf_rss);
> > + return ret;
> > +}
> > +
> > +static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
> > +{
> > + bool ret = false;
> > +
> > + if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> > + if (!(n->ebpf_rss_fds
> > + && virtio_net_load_ebpf_fds(n, errp))) {
> > + ret = ebpf_rss_load(&n->ebpf_rss);
> > + }
> > + }
> > +
> > + return ret;
> > }
> >
> > static void virtio_net_unload_ebpf(VirtIONet *n)
> > @@ -3738,7 +3780,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
> > net_rx_pkt_init(&n->rx_pkt);
> >
> > if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
> > - virtio_net_load_ebpf(n);
> > + virtio_net_load_ebpf(n, errp);
> > }
> > }
> >
> > @@ -3900,6 +3942,7 @@ static Property virtio_net_properties[] = {
> > VIRTIO_NET_F_RSS, false),
> > DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
> > VIRTIO_NET_F_HASH_REPORT, false),
> > + DEFINE_PROP_STRING("ebpf_rss_fds", VirtIONet, ebpf_rss_fds),
> > DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
> > VIRTIO_NET_F_RSC_EXT, false),
> > DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
> > diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
> > index ef234ffe7ef..e10ce88f918 100644
> > --- a/include/hw/virtio/virtio-net.h
> > +++ b/include/hw/virtio/virtio-net.h
> > @@ -219,6 +219,7 @@ struct VirtIONet {
> > VirtioNetRssData rss_data;
> > struct NetRxPkt *rx_pkt;
> > struct EBPFRSSContext ebpf_rss;
> > + char *ebpf_rss_fds;
> > };
> >
> > size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
> > --
> > 2.39.1
> >
>
> With regards,
> Daniel
> --
> |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
> |: https://libvirt.org -o- https://fstop138.berrange.com :|
> |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
>
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-15 9:50 ` Daniel P. Berrangé
@ 2023-05-16 8:47 ` Markus Armbruster
2023-05-16 8:54 ` Daniel P. Berrangé
0 siblings, 1 reply; 26+ messages in thread
From: Markus Armbruster @ 2023-05-16 8:47 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
Daniel P. Berrangé <berrange@redhat.com> writes:
> Question for Markus at the bottom....
>
> On Fri, May 12, 2023 at 03:29:01PM +0300, Andrew Melnychenko wrote:
>> 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.
Yes, but why is this useful?
Explaining why we want this patch is even more important than explaining
what it does. If the commit message does badly at the latter, I can
still read the actual patch. If it does badly at the former, I'm lost.
>>
>> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
>> ---
>> monitor/qmp-cmds.c | 16 ++++++++++++++++
>> qapi/misc.json | 38 ++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 54 insertions(+)
>>
>> diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
>> index b0f948d3376..259bc87ccb1 100644
>> --- a/monitor/qmp-cmds.c
>> +++ b/monitor/qmp-cmds.c
>> @@ -32,6 +32,7 @@
>> #include "hw/mem/memory-device.h"
>> #include "hw/intc/intc.h"
>> #include "hw/rdma/rdma.h"
>> +#include "ebpf/ebpf.h"
>>
>> NameInfo *qmp_query_name(Error **errp)
>> {
>> @@ -209,3 +210,18 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
>> qmp_marshal_qmp_capabilities,
>> QCO_ALLOW_PRECONFIG, 0);
>> }
>> +
>> +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;
>> +}
I recently moved a load of commands from monitor/ to the appropriate
subsystem. I'm reluctant to add back commands that aren't about
controlling the monitor. Why not ebpf/ebpf-qmp-cmd.c, so MAINTAINERS
covers it properly?
>> diff --git a/qapi/misc.json b/qapi/misc.json
>> index 6ddd16ea283..e96dac8482b 100644
>> --- a/qapi/misc.json
>> +++ b/qapi/misc.json
Why not qapi/ebpf.json, so MAINTAINERS covers it properly?
>> @@ -618,3 +618,41 @@
>> { 'event': 'VFU_CLIENT_HANGUP',
>> 'data': { 'vfu-id': 'str', 'vfu-qom-path': 'str',
>> 'dev-id': 'str', 'dev-qom-path': 'str' } }
>> +
>> +##
>> +# @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.
What is RSS, and why should I care?
>> +#
>> +# Since: 8.1
>> +##
>> +{ 'enum': 'EbpfProgramID',
>> + 'data': [ { 'name': 'rss', 'if': 'CONFIG_EBPF' } ] }
>> +
>> +##
>> +# @request-ebpf:
>> +#
>> +# Function returns eBPF object that can be loaded with libbpf.
Command, not function.
Please use imperative mood like "Return X" instead of descriptions like
"Command returns X" or "Function returns X".
>> +# Management applications (g.e. libvirt) may load it and pass file
>> +# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
>> +#
>> +# Returns: RSS eBPF object encoded in base64.
>> +#
>> +# Since: 8.1
>> +#
>> +##
So, this is basically a way to retrieve an eBPF program by some
well-known name.
Ignorant question: how are these programs desposited?
>> +{ 'command': 'request-ebpf',
>> + 'data': { 'id': 'EbpfProgramID' },
>> + 'returns': 'EbpfObject' }
>> +
>
> Fnuctionally this is fine so
>
> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
>
>
> A question for Markus though - is is perhaps better to mark all the
> command/enum/object as conditional on CONFIG_EBPF, rather than just
> reporting an empty EbpfProgramID enum when EBPF is disabled at build
> time ?
Using conditionals has two advantages:
1. Checking for the feature is commonly more straightforward
Checking for presence of command with query-qmp-schema works fine
both for old versions of QEMU (where the command doesn't exist) and
new versions (where it exists, but is disabled).
Without conditionals, you need two checks: command present, and
command can actually do something. More complicated even when the
latter check is easy, as it is here.
2. Slightly leaner program when the feature is off
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-16 8:47 ` Markus Armbruster
@ 2023-05-16 8:54 ` Daniel P. Berrangé
2023-05-16 10:23 ` Markus Armbruster
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-16 8:54 UTC (permalink / raw)
To: Markus Armbruster
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
On Tue, May 16, 2023 at 10:47:52AM +0200, Markus Armbruster wrote:
> Daniel P. Berrangé <berrange@redhat.com> writes:
>
> > Question for Markus at the bottom....
> >
> > On Fri, May 12, 2023 at 03:29:01PM +0300, Andrew Melnychenko wrote:
> >> 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.
>
> Yes, but why is this useful?
>
> Explaining why we want this patch is even more important than explaining
> what it does. If the commit message does badly at the latter, I can
> still read the actual patch. If it does badly at the former, I'm lost.
>
> >>
> >> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> >> ---
> >> monitor/qmp-cmds.c | 16 ++++++++++++++++
> >> qapi/misc.json | 38 ++++++++++++++++++++++++++++++++++++++
> >> 2 files changed, 54 insertions(+)
> >>
> >> diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> >> index b0f948d3376..259bc87ccb1 100644
> >> --- a/monitor/qmp-cmds.c
> >> +++ b/monitor/qmp-cmds.c
> >> @@ -32,6 +32,7 @@
> >> #include "hw/mem/memory-device.h"
> >> #include "hw/intc/intc.h"
> >> #include "hw/rdma/rdma.h"
> >> +#include "ebpf/ebpf.h"
> >>
> >> NameInfo *qmp_query_name(Error **errp)
> >> {
> >> @@ -209,3 +210,18 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
> >> qmp_marshal_qmp_capabilities,
> >> QCO_ALLOW_PRECONFIG, 0);
> >> }
> >> +
> >> +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;
> >> +}
>
> I recently moved a load of commands from monitor/ to the appropriate
> subsystem. I'm reluctant to add back commands that aren't about
> controlling the monitor. Why not ebpf/ebpf-qmp-cmd.c, so MAINTAINERS
> covers it properly?
>
> >> diff --git a/qapi/misc.json b/qapi/misc.json
> >> index 6ddd16ea283..e96dac8482b 100644
> >> --- a/qapi/misc.json
> >> +++ b/qapi/misc.json
>
> Why not qapi/ebpf.json, so MAINTAINERS covers it properly?
>
> >> @@ -618,3 +618,41 @@
> >> { 'event': 'VFU_CLIENT_HANGUP',
> >> 'data': { 'vfu-id': 'str', 'vfu-qom-path': 'str',
> >> 'dev-id': 'str', 'dev-qom-path': 'str' } }
> >> +
> >> +##
> >> +# @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.
>
> What is RSS, and why should I care?
>
> >> +#
> >> +# Since: 8.1
> >> +##
> >> +{ 'enum': 'EbpfProgramID',
> >> + 'data': [ { 'name': 'rss', 'if': 'CONFIG_EBPF' } ] }
> >> +
> >> +##
> >> +# @request-ebpf:
> >> +#
> >> +# Function returns eBPF object that can be loaded with libbpf.
>
> Command, not function.
>
> Please use imperative mood like "Return X" instead of descriptions like
> "Command returns X" or "Function returns X".
>
> >> +# Management applications (g.e. libvirt) may load it and pass file
> >> +# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
> >> +#
> >> +# Returns: RSS eBPF object encoded in base64.
> >> +#
> >> +# Since: 8.1
> >> +#
> >> +##
>
> So, this is basically a way to retrieve an eBPF program by some
> well-known name.
>
> Ignorant question: how are these programs desposited?
The eBPF code blob is linked into QEMU at build time. THis API lets
libvirt fetch it from QEMU, in base64 format. When libvirt later
creates NICs, it can attach the eBPF code blob to the TAP device (which
requires elevated privilleges that QEMU lacks). NB, libvirt would fetch
the eBPF code from QEMU when probing capabilities, as once a VM is
running it is untrusted.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-16 8:54 ` Daniel P. Berrangé
@ 2023-05-16 10:23 ` Markus Armbruster
2023-05-16 10:29 ` Daniel P. Berrangé
0 siblings, 1 reply; 26+ messages in thread
From: Markus Armbruster @ 2023-05-16 10:23 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
Daniel P. Berrangé <berrange@redhat.com> writes:
> On Tue, May 16, 2023 at 10:47:52AM +0200, Markus Armbruster wrote:
[...]
>> So, this is basically a way to retrieve an eBPF program by some
>> well-known name.
>>
>> Ignorant question: how are these programs desposited?
>
> The eBPF code blob is linked into QEMU at build time. THis API lets
> libvirt fetch it from QEMU, in base64 format. When libvirt later
> creates NICs, it can attach the eBPF code blob to the TAP device (which
> requires elevated privilleges that QEMU lacks). NB, libvirt would fetch
> the eBPF code from QEMU when probing capabilities, as once a VM is
> running it is untrusted.
Okay, I can see how that helps. I trust the blob is in a read-only
segment. Ideally, libvirt fetches it before the guest runs.
Please improve the QAPI schema doc comments to explain why and how the
feature is to be used in a bit more detail. The existing text
Function 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.
is too terse.
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-16 10:23 ` Markus Armbruster
@ 2023-05-16 10:29 ` Daniel P. Berrangé
2023-05-16 14:04 ` Markus Armbruster
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-16 10:29 UTC (permalink / raw)
To: Markus Armbruster
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
On Tue, May 16, 2023 at 12:23:28PM +0200, Markus Armbruster wrote:
> Daniel P. Berrangé <berrange@redhat.com> writes:
>
> > On Tue, May 16, 2023 at 10:47:52AM +0200, Markus Armbruster wrote:
>
> [...]
>
> >> So, this is basically a way to retrieve an eBPF program by some
> >> well-known name.
> >>
> >> Ignorant question: how are these programs desposited?
> >
> > The eBPF code blob is linked into QEMU at build time. THis API lets
> > libvirt fetch it from QEMU, in base64 format. When libvirt later
> > creates NICs, it can attach the eBPF code blob to the TAP device (which
> > requires elevated privilleges that QEMU lacks). NB, libvirt would fetch
> > the eBPF code from QEMU when probing capabilities, as once a VM is
> > running it is untrusted.
>
> Okay, I can see how that helps. I trust the blob is in a read-only
> segment. Ideally, libvirt fetches it before the guest runs.
Whether the blob is in a read-only segment or not isn't important,
because it transits writable memory in the QMP command marshalling.
IOW, if we're trying to mitigate against compromised QEMU, we
*must* fetch it before vCPUs are started. If we're super paranoid,
we would want to fetch it before even opening untrusted disk images
too. It might push towards fetching it while probing capabilities
from a throw-away QEMU with "-m none"
> Please improve the QAPI schema doc comments to explain why and how the
> feature is to be used in a bit more detail. The existing text
>
> Function 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.
>
> is too terse.
>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-16 10:29 ` Daniel P. Berrangé
@ 2023-05-16 14:04 ` Markus Armbruster
2023-05-16 14:35 ` Daniel P. Berrangé
0 siblings, 1 reply; 26+ messages in thread
From: Markus Armbruster @ 2023-05-16 14:04 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
Daniel P. Berrangé <berrange@redhat.com> writes:
> On Tue, May 16, 2023 at 12:23:28PM +0200, Markus Armbruster wrote:
>> Daniel P. Berrangé <berrange@redhat.com> writes:
>>
>> > On Tue, May 16, 2023 at 10:47:52AM +0200, Markus Armbruster wrote:
>>
>> [...]
>>
>> >> So, this is basically a way to retrieve an eBPF program by some
>> >> well-known name.
>> >>
>> >> Ignorant question: how are these programs desposited?
>> >
>> > The eBPF code blob is linked into QEMU at build time. THis API lets
>> > libvirt fetch it from QEMU, in base64 format. When libvirt later
>> > creates NICs, it can attach the eBPF code blob to the TAP device (which
>> > requires elevated privilleges that QEMU lacks). NB, libvirt would fetch
>> > the eBPF code from QEMU when probing capabilities, as once a VM is
>> > running it is untrusted.
>>
>> Okay, I can see how that helps. I trust the blob is in a read-only
>> segment. Ideally, libvirt fetches it before the guest runs.
>
> Whether the blob is in a read-only segment or not isn't important,
> because it transits writable memory in the QMP command marshalling.
True. We could bypass marshalling. Unclean hack. Or we could sign the
bits cryptograhically. Key management headaches. Not worth it, because
fetching it before QEMU becomes untrusted is easier.
However, I now wonder why we fetch it from QEMU. Why not ship it with
QEMU?
> IOW, if we're trying to mitigate against compromised QEMU, we
> *must* fetch it before vCPUs are started. If we're super paranoid,
> we would want to fetch it before even opening untrusted disk images
> too. It might push towards fetching it while probing capabilities
> from a throw-away QEMU with "-m none"
[...]
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-16 14:04 ` Markus Armbruster
@ 2023-05-16 14:35 ` Daniel P. Berrangé
2023-05-16 15:06 ` Markus Armbruster
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-16 14:35 UTC (permalink / raw)
To: Markus Armbruster
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
On Tue, May 16, 2023 at 04:04:39PM +0200, Markus Armbruster wrote:
> Daniel P. Berrangé <berrange@redhat.com> writes:
>
> > On Tue, May 16, 2023 at 12:23:28PM +0200, Markus Armbruster wrote:
> >> Daniel P. Berrangé <berrange@redhat.com> writes:
> >>
> >> > On Tue, May 16, 2023 at 10:47:52AM +0200, Markus Armbruster wrote:
> >>
> >> [...]
> >>
> >> >> So, this is basically a way to retrieve an eBPF program by some
> >> >> well-known name.
> >> >>
> >> >> Ignorant question: how are these programs desposited?
> >> >
> >> > The eBPF code blob is linked into QEMU at build time. THis API lets
> >> > libvirt fetch it from QEMU, in base64 format. When libvirt later
> >> > creates NICs, it can attach the eBPF code blob to the TAP device (which
> >> > requires elevated privilleges that QEMU lacks). NB, libvirt would fetch
> >> > the eBPF code from QEMU when probing capabilities, as once a VM is
> >> > running it is untrusted.
> >>
> >> Okay, I can see how that helps. I trust the blob is in a read-only
> >> segment. Ideally, libvirt fetches it before the guest runs.
> >
> > Whether the blob is in a read-only segment or not isn't important,
> > because it transits writable memory in the QMP command marshalling.
>
> True. We could bypass marshalling. Unclean hack. Or we could sign the
> bits cryptograhically. Key management headaches. Not worth it, because
> fetching it before QEMU becomes untrusted is easier.
>
> However, I now wonder why we fetch it from QEMU. Why not ship it with
> QEMU?
Fetching it from QEMU gives us a strong guarantee that the eBPF
code actually matches the QEMU binary we're talking to, which is
useful if you're dealing with RPMs which can be upgraded behind
your back, or have multiple parallel installs of QEMU.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-16 14:35 ` Daniel P. Berrangé
@ 2023-05-16 15:06 ` Markus Armbruster
2023-05-16 15:18 ` Daniel P. Berrangé
0 siblings, 1 reply; 26+ messages in thread
From: Markus Armbruster @ 2023-05-16 15:06 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
Daniel P. Berrangé <berrange@redhat.com> writes:
> On Tue, May 16, 2023 at 04:04:39PM +0200, Markus Armbruster wrote:
>> Daniel P. Berrangé <berrange@redhat.com> writes:
>>
>> > On Tue, May 16, 2023 at 12:23:28PM +0200, Markus Armbruster wrote:
>> >> Daniel P. Berrangé <berrange@redhat.com> writes:
>> >>
>> >> > On Tue, May 16, 2023 at 10:47:52AM +0200, Markus Armbruster wrote:
>> >>
>> >> [...]
>> >>
>> >> >> So, this is basically a way to retrieve an eBPF program by some
>> >> >> well-known name.
>> >> >>
>> >> >> Ignorant question: how are these programs desposited?
>> >> >
>> >> > The eBPF code blob is linked into QEMU at build time. THis API lets
>> >> > libvirt fetch it from QEMU, in base64 format. When libvirt later
>> >> > creates NICs, it can attach the eBPF code blob to the TAP device (which
>> >> > requires elevated privilleges that QEMU lacks). NB, libvirt would fetch
>> >> > the eBPF code from QEMU when probing capabilities, as once a VM is
>> >> > running it is untrusted.
>> >>
>> >> Okay, I can see how that helps. I trust the blob is in a read-only
>> >> segment. Ideally, libvirt fetches it before the guest runs.
>> >
>> > Whether the blob is in a read-only segment or not isn't important,
>> > because it transits writable memory in the QMP command marshalling.
>>
>> True. We could bypass marshalling. Unclean hack. Or we could sign the
>> bits cryptograhically. Key management headaches. Not worth it, because
>> fetching it before QEMU becomes untrusted is easier.
>>
>> However, I now wonder why we fetch it from QEMU. Why not ship it with
>> QEMU?
>
> Fetching it from QEMU gives us a strong guarantee that the eBPF
> code actually matches the QEMU binary we're talking to, which is
> useful if you're dealing with RPMs which can be upgraded behind
> your back, or have multiple parallel installs of QEMU.
Yes, but what makes this one different from all the other things that
need to match?
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-16 15:06 ` Markus Armbruster
@ 2023-05-16 15:18 ` Daniel P. Berrangé
2023-05-22 10:50 ` Markus Armbruster
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-05-16 15:18 UTC (permalink / raw)
To: Markus Armbruster
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
On Tue, May 16, 2023 at 05:06:24PM +0200, Markus Armbruster wrote:
> Daniel P. Berrangé <berrange@redhat.com> writes:
>
> > On Tue, May 16, 2023 at 04:04:39PM +0200, Markus Armbruster wrote:
> >> Daniel P. Berrangé <berrange@redhat.com> writes:
> >>
> >> > On Tue, May 16, 2023 at 12:23:28PM +0200, Markus Armbruster wrote:
> >> >> Daniel P. Berrangé <berrange@redhat.com> writes:
> >> >>
> >> >> > On Tue, May 16, 2023 at 10:47:52AM +0200, Markus Armbruster wrote:
> >> >>
> >> >> [...]
> >> >>
> >> >> >> So, this is basically a way to retrieve an eBPF program by some
> >> >> >> well-known name.
> >> >> >>
> >> >> >> Ignorant question: how are these programs desposited?
> >> >> >
> >> >> > The eBPF code blob is linked into QEMU at build time. THis API lets
> >> >> > libvirt fetch it from QEMU, in base64 format. When libvirt later
> >> >> > creates NICs, it can attach the eBPF code blob to the TAP device (which
> >> >> > requires elevated privilleges that QEMU lacks). NB, libvirt would fetch
> >> >> > the eBPF code from QEMU when probing capabilities, as once a VM is
> >> >> > running it is untrusted.
> >> >>
> >> >> Okay, I can see how that helps. I trust the blob is in a read-only
> >> >> segment. Ideally, libvirt fetches it before the guest runs.
> >> >
> >> > Whether the blob is in a read-only segment or not isn't important,
> >> > because it transits writable memory in the QMP command marshalling.
> >>
> >> True. We could bypass marshalling. Unclean hack. Or we could sign the
> >> bits cryptograhically. Key management headaches. Not worth it, because
> >> fetching it before QEMU becomes untrusted is easier.
> >>
> >> However, I now wonder why we fetch it from QEMU. Why not ship it with
> >> QEMU?
> >
> > Fetching it from QEMU gives us a strong guarantee that the eBPF
> > code actually matches the QEMU binary we're talking to, which is
> > useful if you're dealing with RPMs which can be upgraded behind
> > your back, or have multiple parallel installs of QEMU.
>
> Yes, but what makes this one different from all the other things that
> need to match?
Many of the external resources QEMU uses don't need to be a precise
match to a QEMU version, it is sufficient for them to be of "version
X or newer". eBPF programs need to be a precise match, because the
QEMU code has assumptions about the eBPF code it uses, such as the
configuration maps present.
There is another example where a perfect match is needed - loadable
.so modules. eg if you're running QEMU and trigger dlopen of a QEMU
module, the loaded module needs to come from the perfect matching
build. Most distros don't solve that, but there was something added
a while back that let QEMU load modules from a specific location.
The idea was that the RPM/Deb package manager can upgrade the
modules, but the modules from the previously installed QEMU would be
kept in somewhere temporary like /var/run/...., so that pre-existing
running QEMU could still load the exact matched .sos. While that hack
kinda works it has too many moving parts for my liking, leaving failure
scenarios open. IMHO, being able to directly fetch the resource
directly from QEMU is a better strategy for eBPF programs, as it
eliminates more of the failure scenarios with very little effort.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 3/6] virtio-net: Added property to load eBPF RSS with fds.
2023-05-15 9:38 ` Daniel P. Berrangé
2023-05-15 10:53 ` Andrew Melnichenko
@ 2023-05-16 21:21 ` Eric Blake
1 sibling, 0 replies; 26+ messages in thread
From: Eric Blake @ 2023-05-16 21:21 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, jasowang, mst, armbru, qemu-devel,
yuri.benditovich, yan
On Mon, May 15, 2023 at 10:38:44AM +0100, Daniel P. Berrangé wrote:
>
> > -static bool virtio_net_load_ebpf(VirtIONet *n)
> > +static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
> > {
> > - if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> > - /* backend does't support steering ebpf */
> > - return false;
> > + int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
>
> Interesting, I didn't realize this initialization syntax was possible !
It's not standard, but if both gcc and clang support it, it would not
be the first time we've relied on useful compiler extensions.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 6/6] ebpf: Updated eBPF program and skeleton.
2023-05-12 12:29 ` [PATCH v2 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
2023-05-15 9:53 ` Daniel P. Berrangé
@ 2023-05-16 21:29 ` Eric Blake
1 sibling, 0 replies; 26+ messages in thread
From: Eric Blake @ 2023-05-16 21:29 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, qemu-devel, berrange, yuri.benditovich,
yan
On Fri, May 12, 2023 at 03:29:02PM +0300, Andrew Melnychenko wrote:
>
> Updated section name, so libbpf should init/gues proper
> program type without specifications during open/load.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++++++-------------------
> tools/ebpf/rss.bpf.c | 2 +-
> 2 files changed, 741 insertions(+), 730 deletions(-)
>
> diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
> index 18eb2adb12c..41b84aea44c 100644
> --- a/ebpf/rss.bpf.skeleton.h
> +++ b/ebpf/rss.bpf.skeleton.h
> @@ -176,162 +176,162 @@ err:
>
> static inline const void *rss_bpf__elf_bytes(size_t *sz)
> {
> - *sz = 20440;
> + *sz = 20720;
> return (const void *)"\
> \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
> -\0\0\0\0\0\0\0\0\0\0\0\x98\x4c\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
Appears to be pre-existing, and looking at the broader context, I see
this comment earlier in the file:
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
but a suggestion to improve things: tweak the comment produced by the
generator to also output the name of the source file (not just the
bpftool generator), to make it easier to figure out how to map this
binary blob of data back to human-readable source and instructions on
how to regenerate it should I want to edit those sources.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
^ permalink raw reply [flat|nested] 26+ messages in thread
* Re: [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob.
2023-05-16 15:18 ` Daniel P. Berrangé
@ 2023-05-22 10:50 ` Markus Armbruster
0 siblings, 0 replies; 26+ messages in thread
From: Markus Armbruster @ 2023-05-22 10:50 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, jasowang, mst, eblake, qemu-devel,
yuri.benditovich, yan
Daniel P. Berrangé <berrange@redhat.com> writes:
> On Tue, May 16, 2023 at 05:06:24PM +0200, Markus Armbruster wrote:
>> Daniel P. Berrangé <berrange@redhat.com> writes:
>>
>> > On Tue, May 16, 2023 at 04:04:39PM +0200, Markus Armbruster wrote:
[...]
>> >> However, I now wonder why we fetch it from QEMU. Why not ship it with
>> >> QEMU?
>> >
>> > Fetching it from QEMU gives us a strong guarantee that the eBPF
>> > code actually matches the QEMU binary we're talking to, which is
>> > useful if you're dealing with RPMs which can be upgraded behind
>> > your back, or have multiple parallel installs of QEMU.
>>
>> Yes, but what makes this one different from all the other things that
>> need to match?
>
> Many of the external resources QEMU uses don't need to be a precise
> match to a QEMU version, it is sufficient for them to be of "version
> X or newer". eBPF programs need to be a precise match, because the
> QEMU code has assumptions about the eBPF code it uses, such as the
> configuration maps present.
>
> There is another example where a perfect match is needed - loadable
> .so modules. eg if you're running QEMU and trigger dlopen of a QEMU
> module, the loaded module needs to come from the perfect matching
> build. Most distros don't solve that, but there was something added
> a while back that let QEMU load modules from a specific location.
>
> The idea was that the RPM/Deb package manager can upgrade the
> modules, but the modules from the previously installed QEMU would be
> kept in somewhere temporary like /var/run/...., so that pre-existing
> running QEMU could still load the exact matched .sos. While that hack
> kinda works it has too many moving parts for my liking, leaving failure
> scenarios open. IMHO, being able to directly fetch the resource
> directly from QEMU is a better strategy for eBPF programs, as it
> eliminates more of the failure scenarios with very little effort.
On the other hand, yet another way to solve the same class of problem.
If we decide that's what we want, the rationale needs to be worked into
the commit message.
^ permalink raw reply [flat|nested] 26+ messages in thread
end of thread, other threads:[~2023-05-22 10:51 UTC | newest]
Thread overview: 26+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-05-12 12:28 [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnychenko
2023-05-12 12:28 ` [PATCH v2 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
2023-05-15 9:34 ` Daniel P. Berrangé
2023-05-12 12:28 ` [PATCH v2 2/6] ebpf: Added eBPF initialization by fds Andrew Melnychenko
2023-05-15 9:35 ` Daniel P. Berrangé
2023-05-12 12:28 ` [PATCH v2 3/6] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
2023-05-15 9:38 ` Daniel P. Berrangé
2023-05-15 10:53 ` Andrew Melnichenko
2023-05-16 21:21 ` Eric Blake
2023-05-12 12:29 ` [PATCH v2 4/6] ebpf: Added declaration/initialization routines Andrew Melnychenko
2023-05-15 9:44 ` Daniel P. Berrangé
2023-05-12 12:29 ` [PATCH v2 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
2023-05-15 9:50 ` Daniel P. Berrangé
2023-05-16 8:47 ` Markus Armbruster
2023-05-16 8:54 ` Daniel P. Berrangé
2023-05-16 10:23 ` Markus Armbruster
2023-05-16 10:29 ` Daniel P. Berrangé
2023-05-16 14:04 ` Markus Armbruster
2023-05-16 14:35 ` Daniel P. Berrangé
2023-05-16 15:06 ` Markus Armbruster
2023-05-16 15:18 ` Daniel P. Berrangé
2023-05-22 10:50 ` Markus Armbruster
2023-05-12 12:29 ` [PATCH v2 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
2023-05-15 9:53 ` Daniel P. Berrangé
2023-05-16 21:29 ` Eric Blake
2023-05-12 12:31 ` [PATCH v2 0/6] eBPF RSS through QMP support Andrew Melnichenko
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