* [RFC PATCH 0/4] eBPF RSS through QMP support.
@ 2023-03-30 0:15 Andrew Melnychenko
2023-03-30 0:15 ` [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
` (5 more replies)
0 siblings, 6 replies; 26+ messages in thread
From: Andrew Melnychenko @ 2023-03-30 0:15 UTC (permalink / raw)
To: jasowang, mst, pbonzini, marcandre.lureau, berrange, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn
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.
Overall, the basic scenario of using the helper looks like this:
* Libvirt checks for ebpf_fds property.
* Libvirt requests eBPF blob through QMP.
* Libvirt loads blob for virtio-net.
* Libvirt launches the QEMU with eBPF fds passed.
Andrew Melnychenko (4):
ebpf: Added eBPF initialization by fds and map update.
virtio-net: Added property to load eBPF RSS with fds.
ebpf: Added declaration/initialization routines.
qmp: Added new command to retrieve eBPF blob.
ebpf/ebpf.c | 48 +++++++++++++
ebpf/ebpf.h | 25 +++++++
ebpf/ebpf_rss-stub.c | 6 ++
ebpf/ebpf_rss.c | 124 +++++++++++++++++++++++++++------
ebpf/ebpf_rss.h | 10 +++
ebpf/meson.build | 1 +
hw/net/virtio-net.c | 77 ++++++++++++++++++--
include/hw/virtio/virtio-net.h | 1 +
monitor/qmp-cmds.c | 17 +++++
qapi/misc.json | 25 +++++++
10 files changed, 307 insertions(+), 27 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
* [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update.
2023-03-30 0:15 [RFC PATCH 0/4] eBPF RSS through QMP support Andrew Melnychenko
@ 2023-03-30 0:15 ` Andrew Melnychenko
2023-03-30 6:53 ` Jason Wang
2023-03-30 0:15 ` [RFC PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
` (4 subsequent siblings)
5 siblings, 1 reply; 26+ messages in thread
From: Andrew Melnychenko @ 2023-03-30 0:15 UTC (permalink / raw)
To: jasowang, mst, pbonzini, marcandre.lureau, berrange, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn
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-stub.c | 6 +++
ebpf/ebpf_rss.c | 120 ++++++++++++++++++++++++++++++++++---------
ebpf/ebpf_rss.h | 10 ++++
3 files changed, 113 insertions(+), 23 deletions(-)
diff --git a/ebpf/ebpf_rss-stub.c b/ebpf/ebpf_rss-stub.c
index e71e229190..8d7fae2ad9 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 cee658c158..08015fecb1 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -27,19 +27,68 @@ void ebpf_rss_init(struct EBPFRSSContext *ctx)
{
if (ctx != NULL) {
ctx->obj = NULL;
+ ctx->program_fd = -1;
}
}
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());
+ 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());
}
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;
}
@@ -66,26 +115,51 @@ 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;
return false;
}
-static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
- struct EBPFRSSConfig *config)
+bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
+ int config_fd, int toeplitz_fd, int table_fd)
{
- uint32_t map_key = 0;
+ if (ctx == NULL || ebpf_rss_is_loaded(ctx)) {
+ return false;
+ }
- if (!ebpf_rss_is_loaded(ctx)) {
+ if (program_fd < 0 || config_fd < 0 || toeplitz_fd < 0 || table_fd < 0) {
return false;
}
- if (bpf_map_update_elem(ctx->map_configuration,
- &map_key, config, 0) < 0) {
+
+ 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;
return false;
}
+
+ return true;
+}
+
+static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
+ struct EBPFRSSConfig *config)
+{
+ if (!ebpf_rss_is_loaded(ctx)) {
+ return false;
+ }
+
+ memcpy(ctx->mmap_configuration, config, sizeof(*config));
return true;
}
@@ -93,27 +167,19 @@ 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 +189,7 @@ 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 +223,17 @@ 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;
}
diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
index bf3f2572c7..239242b0d2 100644
--- a/ebpf/ebpf_rss.h
+++ b/ebpf/ebpf_rss.h
@@ -14,12 +14,19 @@
#ifndef QEMU_EBPF_RSS_H
#define QEMU_EBPF_RSS_H
+#define EBPF_RSS_MAX_FDS 4
+
struct EBPFRSSContext {
void *obj;
int program_fd;
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 {
@@ -36,6 +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
* [RFC PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds.
2023-03-30 0:15 [RFC PATCH 0/4] eBPF RSS through QMP support Andrew Melnychenko
2023-03-30 0:15 ` [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
@ 2023-03-30 0:15 ` Andrew Melnychenko
2023-03-30 8:52 ` Daniel P. Berrangé
2023-03-30 0:15 ` [RFC PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
` (3 subsequent siblings)
5 siblings, 1 reply; 26+ messages in thread
From: Andrew Melnychenko @ 2023-03-30 0:15 UTC (permalink / raw)
To: jasowang, mst, pbonzini, marcandre.lureau, berrange, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn
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 | 77 ++++++++++++++++++++++++++++++++--
include/hw/virtio/virtio-net.h | 1 +
2 files changed, 74 insertions(+), 4 deletions(-)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 53e1c32643..45d448a83d 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 +1306,81 @@ 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 int virtio_net_get_ebpf_rss_fds(char *str, char *fds[], int nfds)
+{
+ char *ptr = str;
+ char *cur = NULL;
+ size_t len = strlen(str);
+ int i = 0;
+
+ for (; i < nfds && ptr < str + len;) {
+ cur = strchr(ptr, ':');
+
+ if (cur == NULL) {
+ fds[i] = g_strdup(ptr);
+ } else {
+ fds[i] = g_strndup(ptr, cur - ptr);
+ }
+
+ i++;
+ if (cur == NULL) {
+ break;
+ } else {
+ ptr = cur + 1;
+ }
+ }
+
+ return i;
+}
+
+static bool virtio_net_load_ebpf_fds(VirtIONet *n)
{
- if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
- /* backend does't support steering ebpf */
+ char *fds_strs[EBPF_RSS_MAX_FDS];
+ int fds[EBPF_RSS_MAX_FDS];
+ int nfds;
+ int ret = false;
+ Error *errp;
+ int i = 0;
+
+ if (n == NULL || !n->ebpf_rss_fds) {
return false;
}
- return ebpf_rss_load(&n->ebpf_rss);
+ nfds = virtio_net_get_ebpf_rss_fds(n->ebpf_rss_fds,
+ fds_strs, EBPF_RSS_MAX_FDS);
+ for (i = 0; i < nfds; i++) {
+ fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], &errp);
+ }
+
+ if (nfds == EBPF_RSS_MAX_FDS) {
+ ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
+ }
+
+ if (!ret) {
+ for (i = 0; i < nfds; i++) {
+ close(fds[i]);
+ }
+ }
+
+ for (i = 0; i < nfds; i++) {
+ g_free(fds_strs[i]);
+ }
+
+ return ret;
+}
+
+static bool virtio_net_load_ebpf(VirtIONet *n)
+{
+ bool ret = true;
+
+ if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
+ if (!(n->ebpf_rss_fds
+ && virtio_net_load_ebpf_fds(n))) {
+ ret = ebpf_rss_load(&n->ebpf_rss);
+ }
+ }
+
+ return ret;
}
static void virtio_net_unload_ebpf(VirtIONet *n)
@@ -3900,6 +3968,7 @@ 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 ef234ffe7e..e10ce88f91 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
* [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-30 0:15 [RFC PATCH 0/4] eBPF RSS through QMP support Andrew Melnychenko
2023-03-30 0:15 ` [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
2023-03-30 0:15 ` [RFC PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
@ 2023-03-30 0:15 ` Andrew Melnychenko
2023-03-30 6:54 ` Jason Wang
2023-03-30 8:33 ` Daniel P. Berrangé
2023-03-30 0:15 ` [RFC PATCH 4/5] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
` (2 subsequent siblings)
5 siblings, 2 replies; 26+ messages in thread
From: Andrew Melnychenko @ 2023-03-30 0:15 UTC (permalink / raw)
To: jasowang, mst, pbonzini, marcandre.lureau, berrange, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn
Cc: yuri.benditovich, yan
Now, the binary objects may be retrieved by id/name.
It would require for future qmp commands that may require specific
eBPF blob.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/ebpf.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
ebpf/ebpf.h | 25 +++++++++++++++++++++++++
ebpf/ebpf_rss.c | 4 ++++
ebpf/meson.build | 1 +
4 files changed, 78 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 0000000000..86320d72f5
--- /dev/null
+++ b/ebpf/ebpf.c
@@ -0,0 +1,48 @@
+/*
+ * 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 "ebpf/ebpf.h"
+
+struct ElfBinaryDataEntry {
+ const char *id;
+ const void * (*fn)(size_t *);
+
+ QSLIST_ENTRY(ElfBinaryDataEntry) node;
+};
+
+static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
+ QSLIST_HEAD_INITIALIZER();
+
+void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *))
+{
+ struct ElfBinaryDataEntry *data = NULL;
+
+ data = g_malloc0(sizeof(*data));
+ data->fn = fn;
+ data->id = id;
+
+ QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, data, node);
+}
+
+const void *ebpf_find_binary_by_id(const char *id, size_t *sz)
+{
+ struct ElfBinaryDataEntry *it = NULL;
+ QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
+ if (strcmp(id, it->id) == 0) {
+ return it->fn(sz);
+ }
+ }
+
+ return NULL;
+}
diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
new file mode 100644
index 0000000000..fd705cb73e
--- /dev/null
+++ b/ebpf/ebpf.h
@@ -0,0 +1,25 @@
+/*
+ * 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
+
+void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *));
+const void *ebpf_find_binary_by_id(const char *id, size_t *sz);
+
+#define ebpf_binary_init(id, fn) \
+static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
+{ \
+ ebpf_register_binary_data(id, fn); \
+}
+
+#endif /* EBPF_H */
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 08015fecb1..b4038725f2 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -21,6 +21,8 @@
#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)
@@ -237,3 +239,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
ctx->obj = NULL;
ctx->program_fd = -1;
}
+
+ebpf_binary_init("rss", rss_bpf__elf_bytes)
diff --git a/ebpf/meson.build b/ebpf/meson.build
index 2dd0fd8948..67c3f53aa9 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
* [RFC PATCH 4/5] qmp: Added new command to retrieve eBPF blob.
2023-03-30 0:15 [RFC PATCH 0/4] eBPF RSS through QMP support Andrew Melnychenko
` (2 preceding siblings ...)
2023-03-30 0:15 ` [RFC PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
@ 2023-03-30 0:15 ` Andrew Melnychenko
2023-03-30 8:39 ` Daniel P. Berrangé
2023-03-30 0:15 ` [RFC PATCH 5/5] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
2023-03-30 6:57 ` [RFC PATCH 0/4] eBPF RSS through QMP support Jason Wang
5 siblings, 1 reply; 26+ messages in thread
From: Andrew Melnychenko @ 2023-03-30 0:15 UTC (permalink / raw)
To: jasowang, mst, pbonzini, marcandre.lureau, berrange, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn
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 | 17 +++++++++++++++++
qapi/misc.json | 25 +++++++++++++++++++++++++
2 files changed, 42 insertions(+)
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index b0f948d337..8f2fc3e7ec 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 +210,19 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
qmp_marshal_qmp_capabilities,
QCO_ALLOW_PRECONFIG, 0);
}
+
+EbpfObject *qmp_request_ebpf(const char *id, Error **errp)
+{
+ EbpfObject *ret = NULL;
+ size_t size = 0;
+ const guchar *data = ebpf_find_binary_by_id(id, &size);
+
+ if (data) {
+ ret = g_new0(EbpfObject, 1);
+ ret->object = g_base64_encode(data, size);
+ } else {
+ error_setg(errp, "can't find eBPF object with id: %s", id);
+ }
+
+ return ret;
+}
diff --git a/qapi/misc.json b/qapi/misc.json
index 6ddd16ea28..4689802460 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -618,3 +618,28 @@
{ '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.
+##
+{ 'struct': 'EbpfObject',
+ 'data': {'object': 'str'} }
+
+##
+# @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: 7.3
+#
+##
+{ 'command': 'request-ebpf',
+ 'data': { 'id': 'str' },
+ 'returns': 'EbpfObject' }
+
--
2.39.1
^ permalink raw reply related [flat|nested] 26+ messages in thread
* [RFC PATCH 5/5] ebpf: Updated eBPF program and skeleton.
2023-03-30 0:15 [RFC PATCH 0/4] eBPF RSS through QMP support Andrew Melnychenko
` (3 preceding siblings ...)
2023-03-30 0:15 ` [RFC PATCH 4/5] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
@ 2023-03-30 0:15 ` Andrew Melnychenko
2023-03-30 6:57 ` [RFC PATCH 0/4] eBPF RSS through QMP support Jason Wang
5 siblings, 0 replies; 26+ messages in thread
From: Andrew Melnychenko @ 2023-03-30 0:15 UTC (permalink / raw)
To: jasowang, mst, pbonzini, marcandre.lureau, berrange, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn
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 18eb2adb12..41b84aea44 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 *)"\
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-\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\
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-\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\
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-\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\
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+\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\
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-\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\
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\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\
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-\xf0\xff\0\0\0\0\x63\x1a\x7c\xff\0\0\0\0\x77\x01\0\0\x20\0\0\0\x63\x1a\x80\xff\
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-\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\
-\0\0\0\0\0\0\0\0\x02\x0e\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\
-\x28\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\x0d\0\0\0\x80\0\0\0\x32\0\0\0\x09\0\0\0\xc0\0\0\
-\0\x59\0\0\0\0\0\0\x0e\x0f\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\x02\x12\0\0\0\0\0\0\0\
-\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x80\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\x01\0\0\0\
-\x80\0\0\0\x32\0\0\0\x11\0\0\0\xc0\0\0\0\x72\0\0\0\0\0\0\x0e\x13\0\0\0\x01\0\0\
-\0\0\0\0\0\0\0\0\x02\x16\0\0\0\x90\0\0\0\x22\0\0\x04\xc0\0\0\0\x9a\0\0\0\x17\0\
-\0\0\0\0\0\0\x9e\0\0\0\x17\0\0\0\x20\0\0\0\xa7\0\0\0\x17\0\0\0\x40\0\0\0\xac\0\
-\0\0\x17\0\0\0\x60\0\0\0\xba\0\0\0\x17\0\0\0\x80\0\0\0\xc3\0\0\0\x17\0\0\0\xa0\
-\0\0\0\xd0\0\0\0\x17\0\0\0\xc0\0\0\0\xd9\0\0\0\x17\0\0\0\xe0\0\0\0\xe4\0\0\0\
-\x17\0\0\0\0\x01\0\0\xed\0\0\0\x17\0\0\0\x20\x01\0\0\xfd\0\0\0\x17\0\0\0\x40\
-\x01\0\0\x05\x01\0\0\x17\0\0\0\x60\x01\0\0\x0e\x01\0\0\x19\0\0\0\x80\x01\0\0\
-\x11\x01\0\0\x17\0\0\0\x20\x02\0\0\x16\x01\0\0\x17\0\0\0\x40\x02\0\0\x21\x01\0\
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-\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 20f227e2ac..d32b6fb42a 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: [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update.
2023-03-30 0:15 ` [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
@ 2023-03-30 6:53 ` Jason Wang
2023-03-30 6:56 ` Jason Wang
2023-03-30 7:10 ` Daniel P. Berrangé
0 siblings, 2 replies; 26+ messages in thread
From: Jason Wang @ 2023-03-30 6:53 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: mst, pbonzini, marcandre.lureau, berrange, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> 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.
This requires kernel support, so after this change, eBPF based RSS
doesn't work on old kernels that only support syscall based map
updating.
I think it's better to keep the syscall path and fail the fds passing
if the kernel doesn't support mmap().
Thanks
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/ebpf_rss-stub.c | 6 +++
> ebpf/ebpf_rss.c | 120 ++++++++++++++++++++++++++++++++++---------
> ebpf/ebpf_rss.h | 10 ++++
> 3 files changed, 113 insertions(+), 23 deletions(-)
>
> diff --git a/ebpf/ebpf_rss-stub.c b/ebpf/ebpf_rss-stub.c
> index e71e229190..8d7fae2ad9 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 cee658c158..08015fecb1 100644
> --- a/ebpf/ebpf_rss.c
> +++ b/ebpf/ebpf_rss.c
> @@ -27,19 +27,68 @@ void ebpf_rss_init(struct EBPFRSSContext *ctx)
> {
> if (ctx != NULL) {
> ctx->obj = NULL;
> + ctx->program_fd = -1;
> }
> }
>
> 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());
> + 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());
> }
>
> 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;
> }
>
> @@ -66,26 +115,51 @@ 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;
>
> return false;
> }
>
> -static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
> - struct EBPFRSSConfig *config)
> +bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
> + int config_fd, int toeplitz_fd, int table_fd)
> {
> - uint32_t map_key = 0;
> + if (ctx == NULL || ebpf_rss_is_loaded(ctx)) {
> + return false;
> + }
>
> - if (!ebpf_rss_is_loaded(ctx)) {
> + if (program_fd < 0 || config_fd < 0 || toeplitz_fd < 0 || table_fd < 0) {
> return false;
> }
> - if (bpf_map_update_elem(ctx->map_configuration,
> - &map_key, config, 0) < 0) {
> +
> + 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;
> return false;
> }
> +
> + return true;
> +}
> +
> +static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
> + struct EBPFRSSConfig *config)
> +{
> + if (!ebpf_rss_is_loaded(ctx)) {
> + return false;
> + }
> +
> + memcpy(ctx->mmap_configuration, config, sizeof(*config));
> return true;
> }
>
> @@ -93,27 +167,19 @@ 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 +189,7 @@ 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 +223,17 @@ 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;
> }
> diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
> index bf3f2572c7..239242b0d2 100644
> --- a/ebpf/ebpf_rss.h
> +++ b/ebpf/ebpf_rss.h
> @@ -14,12 +14,19 @@
> #ifndef QEMU_EBPF_RSS_H
> #define QEMU_EBPF_RSS_H
>
> +#define EBPF_RSS_MAX_FDS 4
> +
> struct EBPFRSSContext {
> void *obj;
> int program_fd;
> 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 {
> @@ -36,6 +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 [flat|nested] 26+ messages in thread
* Re: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-30 0:15 ` [RFC PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
@ 2023-03-30 6:54 ` Jason Wang
2023-03-30 8:34 ` Daniel P. Berrangé
2023-03-30 8:33 ` Daniel P. Berrangé
1 sibling, 1 reply; 26+ messages in thread
From: Jason Wang @ 2023-03-30 6:54 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: mst, pbonzini, marcandre.lureau, berrange, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> wrote:
>
> Now, the binary objects may be retrieved by id/name.
> It would require for future qmp commands that may require specific
> eBPF blob.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/ebpf.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> ebpf/ebpf.h | 25 +++++++++++++++++++++++++
> ebpf/ebpf_rss.c | 4 ++++
> ebpf/meson.build | 1 +
> 4 files changed, 78 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 0000000000..86320d72f5
> --- /dev/null
> +++ b/ebpf/ebpf.c
> @@ -0,0 +1,48 @@
> +/*
> + * 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 "ebpf/ebpf.h"
> +
> +struct ElfBinaryDataEntry {
> + const char *id;
> + const void * (*fn)(size_t *);
> +
> + QSLIST_ENTRY(ElfBinaryDataEntry) node;
> +};
> +
> +static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
> + QSLIST_HEAD_INITIALIZER();
> +
> +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *))
> +{
> + struct ElfBinaryDataEntry *data = NULL;
> +
> + data = g_malloc0(sizeof(*data));
> + data->fn = fn;
> + data->id = id;
> +
> + QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, data, node);
> +}
> +
> +const void *ebpf_find_binary_by_id(const char *id, size_t *sz)
> +{
> + struct ElfBinaryDataEntry *it = NULL;
> + QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
> + if (strcmp(id, it->id) == 0) {
> + return it->fn(sz);
> + }
> + }
> +
> + return NULL;
> +}
> diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
> new file mode 100644
> index 0000000000..fd705cb73e
> --- /dev/null
> +++ b/ebpf/ebpf.h
> @@ -0,0 +1,25 @@
> +/*
> + * 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
> +
> +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *));
> +const void *ebpf_find_binary_by_id(const char *id, size_t *sz);
> +
> +#define ebpf_binary_init(id, fn) \
> +static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
> +{ \
> + ebpf_register_binary_data(id, fn); \
> +}
> +
> +#endif /* EBPF_H */
> diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
> index 08015fecb1..b4038725f2 100644
> --- a/ebpf/ebpf_rss.c
> +++ b/ebpf/ebpf_rss.c
> @@ -21,6 +21,8 @@
>
> #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)
> @@ -237,3 +239,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
> ctx->obj = NULL;
> ctx->program_fd = -1;
> }
> +
> +ebpf_binary_init("rss", rss_bpf__elf_bytes)
Who or how the ABI compatibility is preserved between libvirt and Qemu?
Thanks
> diff --git a/ebpf/meson.build b/ebpf/meson.build
> index 2dd0fd8948..67c3f53aa9 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 [flat|nested] 26+ messages in thread
* Re: [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update.
2023-03-30 6:53 ` Jason Wang
@ 2023-03-30 6:56 ` Jason Wang
2023-03-30 7:10 ` Daniel P. Berrangé
1 sibling, 0 replies; 26+ messages in thread
From: Jason Wang @ 2023-03-30 6:56 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: mst, pbonzini, marcandre.lureau, berrange, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
On Thu, Mar 30, 2023 at 2:53 PM Jason Wang <jasowang@redhat.com> wrote:
>
> On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> 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.
>
> This requires kernel support, so after this change, eBPF based RSS
> doesn't work on old kernels that only support syscall based map
> updating.
>
> I think it's better to keep the syscall path and fail the fds passing
> if the kernel doesn't support mmap().
>
> Thanks
>
> >
> > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> > ---
> > ebpf/ebpf_rss-stub.c | 6 +++
> > ebpf/ebpf_rss.c | 120 ++++++++++++++++++++++++++++++++++---------
> > ebpf/ebpf_rss.h | 10 ++++
> > 3 files changed, 113 insertions(+), 23 deletions(-)
> >
> > diff --git a/ebpf/ebpf_rss-stub.c b/ebpf/ebpf_rss-stub.c
> > index e71e229190..8d7fae2ad9 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 cee658c158..08015fecb1 100644
> > --- a/ebpf/ebpf_rss.c
> > +++ b/ebpf/ebpf_rss.c
> > @@ -27,19 +27,68 @@ void ebpf_rss_init(struct EBPFRSSContext *ctx)
> > {
> > if (ctx != NULL) {
> > ctx->obj = NULL;
> > + ctx->program_fd = -1;
> > }
> > }
> >
> > 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());
> > + 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());
> > }
> >
> > 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;
> > }
> >
> > @@ -66,26 +115,51 @@ 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;
> >
> > return false;
> > }
> >
> > -static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
> > - struct EBPFRSSConfig *config)
> > +bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
> > + int config_fd, int toeplitz_fd, int table_fd)
> > {
> > - uint32_t map_key = 0;
> > + if (ctx == NULL || ebpf_rss_is_loaded(ctx)) {
> > + return false;
> > + }
> >
> > - if (!ebpf_rss_is_loaded(ctx)) {
> > + if (program_fd < 0 || config_fd < 0 || toeplitz_fd < 0 || table_fd < 0) {
> > return false;
> > }
> > - if (bpf_map_update_elem(ctx->map_configuration,
> > - &map_key, config, 0) < 0) {
> > +
> > + 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;
> > return false;
> > }
> > +
> > + return true;
> > +}
> > +
> > +static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
> > + struct EBPFRSSConfig *config)
> > +{
> > + if (!ebpf_rss_is_loaded(ctx)) {
> > + return false;
> > + }
> > +
> > + memcpy(ctx->mmap_configuration, config, sizeof(*config));
> > return true;
> > }
> >
> > @@ -93,27 +167,19 @@ 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);
Btw, I wonder what's the atomic requirement here.
Using memcpy may result in byte to byte updating that may result in
unexpected redirection of the flows.
Thanks
> > 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 +189,7 @@ 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 +223,17 @@ 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;
> > }
> > diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
> > index bf3f2572c7..239242b0d2 100644
> > --- a/ebpf/ebpf_rss.h
> > +++ b/ebpf/ebpf_rss.h
> > @@ -14,12 +14,19 @@
> > #ifndef QEMU_EBPF_RSS_H
> > #define QEMU_EBPF_RSS_H
> >
> > +#define EBPF_RSS_MAX_FDS 4
> > +
> > struct EBPFRSSContext {
> > void *obj;
> > int program_fd;
> > 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 {
> > @@ -36,6 +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 [flat|nested] 26+ messages in thread
* Re: [RFC PATCH 0/4] eBPF RSS through QMP support.
2023-03-30 0:15 [RFC PATCH 0/4] eBPF RSS through QMP support Andrew Melnychenko
` (4 preceding siblings ...)
2023-03-30 0:15 ` [RFC PATCH 5/5] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
@ 2023-03-30 6:57 ` Jason Wang
2023-03-30 10:48 ` Andrew Melnichenko
5 siblings, 1 reply; 26+ messages in thread
From: Jason Wang @ 2023-03-30 6:57 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: mst, pbonzini, marcandre.lureau, berrange, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
On Thu, Mar 30, 2023 at 8:33 AM 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.
>
> Overall, the basic scenario of using the helper looks like this:
> * Libvirt checks for ebpf_fds property.
> * Libvirt requests eBPF blob through QMP.
> * Libvirt loads blob for virtio-net.
> * Libvirt launches the QEMU with eBPF fds passed.
Is there a libvirt side draft that can be used as a reference?
Thanks
>
> Andrew Melnychenko (4):
> ebpf: Added eBPF initialization by fds and map update.
> virtio-net: Added property to load eBPF RSS with fds.
> ebpf: Added declaration/initialization routines.
> qmp: Added new command to retrieve eBPF blob.
>
> ebpf/ebpf.c | 48 +++++++++++++
> ebpf/ebpf.h | 25 +++++++
> ebpf/ebpf_rss-stub.c | 6 ++
> ebpf/ebpf_rss.c | 124 +++++++++++++++++++++++++++------
> ebpf/ebpf_rss.h | 10 +++
> ebpf/meson.build | 1 +
> hw/net/virtio-net.c | 77 ++++++++++++++++++--
> include/hw/virtio/virtio-net.h | 1 +
> monitor/qmp-cmds.c | 17 +++++
> qapi/misc.json | 25 +++++++
> 10 files changed, 307 insertions(+), 27 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: [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update.
2023-03-30 6:53 ` Jason Wang
2023-03-30 6:56 ` Jason Wang
@ 2023-03-30 7:10 ` Daniel P. Berrangé
2023-03-30 11:13 ` Andrew Melnichenko
1 sibling, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-03-30 7:10 UTC (permalink / raw)
To: Jason Wang
Cc: Andrew Melnychenko, mst, pbonzini, marcandre.lureau, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn,
yuri.benditovich, yan
On Thu, Mar 30, 2023 at 02:53:16PM +0800, Jason Wang wrote:
> On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> 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.
>
> This requires kernel support, so after this change, eBPF based RSS
> doesn't work on old kernels that only support syscall based map
> updating.
What kernel version is the cut off ?
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: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-30 0:15 ` [RFC PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
2023-03-30 6:54 ` Jason Wang
@ 2023-03-30 8:33 ` Daniel P. Berrangé
2023-03-30 11:02 ` Andrew Melnichenko
1 sibling, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-03-30 8:33 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, pbonzini, marcandre.lureau, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
On Thu, Mar 30, 2023 at 03:15:20AM +0300, Andrew Melnychenko wrote:
> Now, the binary objects may be retrieved by id/name.
> It would require for future qmp commands that may require specific
> eBPF blob.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/ebpf.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> ebpf/ebpf.h | 25 +++++++++++++++++++++++++
> ebpf/ebpf_rss.c | 4 ++++
> ebpf/meson.build | 1 +
> 4 files changed, 78 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 0000000000..86320d72f5
> --- /dev/null
> +++ b/ebpf/ebpf.c
> @@ -0,0 +1,48 @@
> +/*
> + * 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 "ebpf/ebpf.h"
> +
> +struct ElfBinaryDataEntry {
> + const char *id;
> + const void * (*fn)(size_t *);
It feels odd to be storing the function there, as that's just
an artifact of how the EBPF rss program is acquired. IMHO
this should just be
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(const char *id, const void * (*fn)(size_t *))
> +{
> + struct ElfBinaryDataEntry *data = NULL;
> +
> + data = g_malloc0(sizeof(*data));
We prefer g_new0 over g_malloc and initialize when declaring eg
struct ElfBinaryDataEntry *data = g_new0(struct ElfBinaryDataEntry, 1);
> + data->fn = fn;
> + data->id = id;
> +
> + QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, data, node);
> +}
> +
> +const void *ebpf_find_binary_by_id(const char *id, size_t *sz)
> +{
> + struct ElfBinaryDataEntry *it = NULL;
> + QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
> + if (strcmp(id, it->id) == 0) {
> + return it->fn(sz);
> + }
> + }
> +
> + return NULL;
> +}
> diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
> new file mode 100644
> index 0000000000..fd705cb73e
> --- /dev/null
> +++ b/ebpf/ebpf.h
> @@ -0,0 +1,25 @@
> +/*
> + * 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
> +
> +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *));
IMHO it would be better as
void ebpf_register_binary_data(const char *id, const void *data, size_t datalen);
> +const void *ebpf_find_binary_by_id(const char *id, size_t *sz);
> +
> +#define ebpf_binary_init(id, fn) \
> +static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
> +{ \
> + ebpf_register_binary_data(id, fn); \
size_t datalen;
const void *data = fn(&datalen);
ebpf_register_binary_data(oid, data, datalen);
> +}
> +
> +#endif /* EBPF_H */
> diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
> index 08015fecb1..b4038725f2 100644
> --- a/ebpf/ebpf_rss.c
> +++ b/ebpf/ebpf_rss.c
> @@ -21,6 +21,8 @@
>
> #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)
> @@ -237,3 +239,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
> ctx->obj = NULL;
> ctx->program_fd = -1;
> }
> +
> +ebpf_binary_init("rss", rss_bpf__elf_bytes)
> diff --git a/ebpf/meson.build b/ebpf/meson.build
> index 2dd0fd8948..67c3f53aa9 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
>
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: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-30 6:54 ` Jason Wang
@ 2023-03-30 8:34 ` Daniel P. Berrangé
2023-03-31 7:48 ` Jason Wang
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-03-30 8:34 UTC (permalink / raw)
To: Jason Wang
Cc: Andrew Melnychenko, mst, pbonzini, marcandre.lureau, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn,
yuri.benditovich, yan
On Thu, Mar 30, 2023 at 02:54:32PM +0800, Jason Wang wrote:
> On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> >
> > Now, the binary objects may be retrieved by id/name.
> > It would require for future qmp commands that may require specific
> > eBPF blob.
> >
> > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> > ---
> > ebpf/ebpf.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> > ebpf/ebpf.h | 25 +++++++++++++++++++++++++
> > ebpf/ebpf_rss.c | 4 ++++
> > ebpf/meson.build | 1 +
> > 4 files changed, 78 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 0000000000..86320d72f5
> > --- /dev/null
> > +++ b/ebpf/ebpf.c
> > @@ -0,0 +1,48 @@
> > +/*
> > + * 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 "ebpf/ebpf.h"
> > +
> > +struct ElfBinaryDataEntry {
> > + const char *id;
> > + const void * (*fn)(size_t *);
> > +
> > + QSLIST_ENTRY(ElfBinaryDataEntry) node;
> > +};
> > +
> > +static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
> > + QSLIST_HEAD_INITIALIZER();
> > +
> > +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *))
> > +{
> > + struct ElfBinaryDataEntry *data = NULL;
> > +
> > + data = g_malloc0(sizeof(*data));
> > + data->fn = fn;
> > + data->id = id;
> > +
> > + QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, data, node);
> > +}
> > +
> > +const void *ebpf_find_binary_by_id(const char *id, size_t *sz)
> > +{
> > + struct ElfBinaryDataEntry *it = NULL;
> > + QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
> > + if (strcmp(id, it->id) == 0) {
> > + return it->fn(sz);
> > + }
> > + }
> > +
> > + return NULL;
> > +}
> > diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
> > new file mode 100644
> > index 0000000000..fd705cb73e
> > --- /dev/null
> > +++ b/ebpf/ebpf.h
> > @@ -0,0 +1,25 @@
> > +/*
> > + * 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
> > +
> > +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *));
> > +const void *ebpf_find_binary_by_id(const char *id, size_t *sz);
> > +
> > +#define ebpf_binary_init(id, fn) \
> > +static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
> > +{ \
> > + ebpf_register_binary_data(id, fn); \
> > +}
> > +
> > +#endif /* EBPF_H */
> > diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
> > index 08015fecb1..b4038725f2 100644
> > --- a/ebpf/ebpf_rss.c
> > +++ b/ebpf/ebpf_rss.c
> > @@ -21,6 +21,8 @@
> >
> > #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)
> > @@ -237,3 +239,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
> > ctx->obj = NULL;
> > ctx->program_fd = -1;
> > }
> > +
> > +ebpf_binary_init("rss", rss_bpf__elf_bytes)
>
> Who or how the ABI compatibility is preserved between libvirt and Qemu?
There's no real problem with binary compatibility to solve any more.
When libvirt first launches a QEMU VM, it will fetch the eBPF programs
it needs from that running QEMU using QMP. WHen it later needs to
enable features that use eBPF, it already has the program data that
matches the running 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: [RFC PATCH 4/5] qmp: Added new command to retrieve eBPF blob.
2023-03-30 0:15 ` [RFC PATCH 4/5] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
@ 2023-03-30 8:39 ` Daniel P. Berrangé
2023-03-30 10:42 ` Andrew Melnichenko
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-03-30 8:39 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, pbonzini, marcandre.lureau, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
On Thu, Mar 30, 2023 at 03:15:21AM +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 | 17 +++++++++++++++++
> qapi/misc.json | 25 +++++++++++++++++++++++++
> 2 files changed, 42 insertions(+)
>
> diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> index b0f948d337..8f2fc3e7ec 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 +210,19 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
> qmp_marshal_qmp_capabilities,
> QCO_ALLOW_PRECONFIG, 0);
> }
> +
> +EbpfObject *qmp_request_ebpf(const char *id, Error **errp)
> +{
> + EbpfObject *ret = NULL;
> + size_t size = 0;
> + const guchar *data = ebpf_find_binary_by_id(id, &size);
"const void *data" I believe
> +
> + if (data) {
> + ret = g_new0(EbpfObject, 1);
> + ret->object = g_base64_encode(data, size);
> + } else {
> + error_setg(errp, "can't find eBPF object with id: %s", id);
I think I'm inclined to say that we should add an 'Error **errp'
parameter to ebpf_find_binary_by_id(), and make it responsible
for this error message, such that we get
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;
> + }
> +
> + return ret;
> +}
> diff --git a/qapi/misc.json b/qapi/misc.json
> index 6ddd16ea28..4689802460 100644
> --- a/qapi/misc.json
> +++ b/qapi/misc.json
> @@ -618,3 +618,28 @@
> { '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.
Needs a 'Since' tag
> +##
> +{ 'struct': 'EbpfObject',
> + 'data': {'object': 'str'} }
> +
> +##
> +# @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: 7.3
We're about to release 8.0 and so the next will be 8.1
> +#
> +##
> +{ 'command': 'request-ebpf',
> + 'data': { 'id': 'str' },
> + 'returns': 'EbpfObject' }
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: [RFC PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds.
2023-03-30 0:15 ` [RFC PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
@ 2023-03-30 8:52 ` Daniel P. Berrangé
0 siblings, 0 replies; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-03-30 8:52 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, pbonzini, marcandre.lureau, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
On Thu, Mar 30, 2023 at 03:15:19AM +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 | 77 ++++++++++++++++++++++++++++++++--
> include/hw/virtio/virtio-net.h | 1 +
> 2 files changed, 74 insertions(+), 4 deletions(-)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 53e1c32643..45d448a83d 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 +1306,81 @@ 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 int virtio_net_get_ebpf_rss_fds(char *str, char *fds[], int nfds)
Needs to have an 'Error **errp' parameter
> +{
> + char *ptr = str;
> + char *cur = NULL;
> + size_t len = strlen(str);
> + int i = 0;
> +
> + for (; i < nfds && ptr < str + len;) {
> + cur = strchr(ptr, ':');
> +
> + if (cur == NULL) {
> + fds[i] = g_strdup(ptr);
> + } else {
> + fds[i] = g_strndup(ptr, cur - ptr);
> + }
> +
> + i++;
> + if (cur == NULL) {
> + break;
> + } else {
> + ptr = cur + 1;
> + }
> + }
...and here needs to error_setg(...) if the string being parsed has
more FDs present than 'nfds', and return error.
It should also report error if less than 'nfds' were present.
> +
> + return i;
> +}
> +
> +static bool virtio_net_load_ebpf_fds(VirtIONet *n)
> {
> - if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> - /* backend does't support steering ebpf */
> + char *fds_strs[EBPF_RSS_MAX_FDS];
> + int fds[EBPF_RSS_MAX_FDS];
> + int nfds;
> + int ret = false;
> + Error *errp;
This method should be having 'Error **errp' passed into it
instead
> + int i = 0;
> +
> + if (n == NULL || !n->ebpf_rss_fds) {
> return false;
> }
The only caller has already de-referenced 'n' so n == NULL is
impossible. The caller has also chck ebpf_rss_fds != NULL.
IOW, this is redundant
> - return ebpf_rss_load(&n->ebpf_rss);
> + nfds = virtio_net_get_ebpf_rss_fds(n->ebpf_rss_fds,
> + fds_strs, EBPF_RSS_MAX_FDS);
Needs to pass in 'errp' and check for the error condition on return
if (nfds != EBPF_RSS_MAX_FDS)
return false;
> + for (i = 0; i < nfds; i++) {
> + fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], &errp);
if (fds[i] < 0)
....close all FDs so far and return error...
> + }
> +
> + if (nfds == EBPF_RSS_MAX_FDS) {
> + ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
> + }
This condition is not required, since we should have check
it immediately after the virtio_net_get_ebpf_rss_fds() call
> +
> + if (!ret) {
> + for (i = 0; i < nfds; i++) {
> + close(fds[i]);
> + }
> + }
> +
> + for (i = 0; i < nfds; i++) {
> + g_free(fds_strs[i]);
> + }
> +
> + return ret;
> +}
> +
> +static bool virtio_net_load_ebpf(VirtIONet *n)
This needs to have "Error **errp' added to it and return an
error on failure. The caller already has an 'errp' available
to pass in.
> +{
> + bool ret = true;
> +
> + if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> + if (!(n->ebpf_rss_fds
> + && virtio_net_load_ebpf_fds(n))) {
> + ret = ebpf_rss_load(&n->ebpf_rss);
> + }
> + }
> +
> + return ret;
> }
>
> static void virtio_net_unload_ebpf(VirtIONet *n)
> @@ -3900,6 +3968,7 @@ 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 ef234ffe7e..e10ce88f91 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: [RFC PATCH 4/5] qmp: Added new command to retrieve eBPF blob.
2023-03-30 8:39 ` Daniel P. Berrangé
@ 2023-03-30 10:42 ` Andrew Melnichenko
0 siblings, 0 replies; 26+ messages in thread
From: Andrew Melnichenko @ 2023-03-30 10:42 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: jasowang, mst, pbonzini, marcandre.lureau, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
Hi all,
On Thu, Mar 30, 2023 at 11:39 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Thu, Mar 30, 2023 at 03:15:21AM +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 | 17 +++++++++++++++++
> > qapi/misc.json | 25 +++++++++++++++++++++++++
> > 2 files changed, 42 insertions(+)
> >
> > diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> > index b0f948d337..8f2fc3e7ec 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 +210,19 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
> > qmp_marshal_qmp_capabilities,
> > QCO_ALLOW_PRECONFIG, 0);
> > }
> > +
> > +EbpfObject *qmp_request_ebpf(const char *id, Error **errp)
> > +{
> > + EbpfObject *ret = NULL;
> > + size_t size = 0;
> > + const guchar *data = ebpf_find_binary_by_id(id, &size);
>
> "const void *data" I believe
>
> > +
> > + if (data) {
> > + ret = g_new0(EbpfObject, 1);
> > + ret->object = g_base64_encode(data, size);
> > + } else {
> > + error_setg(errp, "can't find eBPF object with id: %s", id);
>
> I think I'm inclined to say that we should add an 'Error **errp'
> parameter to ebpf_find_binary_by_id(), and make it responsible
> for this error message, such that we get
Ok, I'll add it.
>
> 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;
>
> > + }
> > +
> > + return ret;
> > +}
> > diff --git a/qapi/misc.json b/qapi/misc.json
> > index 6ddd16ea28..4689802460 100644
> > --- a/qapi/misc.json
> > +++ b/qapi/misc.json
> > @@ -618,3 +618,28 @@
> > { '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.
>
> Needs a 'Since' tag
Ah yes, thank you.
>
> > +##
> > +{ 'struct': 'EbpfObject',
> > + 'data': {'object': 'str'} }
> > +
> > +##
> > +# @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: 7.3
>
> We're about to release 8.0 and so the next will be 8.1
Thanks, I'll update it.
>
> > +#
> > +##
> > +{ 'command': 'request-ebpf',
> > + 'data': { 'id': 'str' },
> > + 'returns': 'EbpfObject' }
>
> 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: [RFC PATCH 0/4] eBPF RSS through QMP support.
2023-03-30 6:57 ` [RFC PATCH 0/4] eBPF RSS through QMP support Jason Wang
@ 2023-03-30 10:48 ` Andrew Melnichenko
0 siblings, 0 replies; 26+ messages in thread
From: Andrew Melnichenko @ 2023-03-30 10:48 UTC (permalink / raw)
To: Jason Wang
Cc: mst, pbonzini, marcandre.lureau, berrange, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
On Thu, Mar 30, 2023 at 9:57 AM Jason Wang <jasowang@redhat.com> wrote:
>
> On Thu, Mar 30, 2023 at 8:33 AM 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.
> >
> > Overall, the basic scenario of using the helper looks like this:
> > * Libvirt checks for ebpf_fds property.
> > * Libvirt requests eBPF blob through QMP.
> > * Libvirt loads blob for virtio-net.
> > * Libvirt launches the QEMU with eBPF fds passed.
>
> Is there a libvirt side draft that can be used as a reference?
>
> Thanks
>
I'm working on it. This is why it's RFC.
I have a small script that checks that eBPF retrieved through QMP can be loaded.
Also, please check the eBPF blob declaration/initialization routine
and qmp commands.
So, this API should be implemented once and right.
> >
> > Andrew Melnychenko (4):
> > ebpf: Added eBPF initialization by fds and map update.
> > virtio-net: Added property to load eBPF RSS with fds.
> > ebpf: Added declaration/initialization routines.
> > qmp: Added new command to retrieve eBPF blob.
> >
> > ebpf/ebpf.c | 48 +++++++++++++
> > ebpf/ebpf.h | 25 +++++++
> > ebpf/ebpf_rss-stub.c | 6 ++
> > ebpf/ebpf_rss.c | 124 +++++++++++++++++++++++++++------
> > ebpf/ebpf_rss.h | 10 +++
> > ebpf/meson.build | 1 +
> > hw/net/virtio-net.c | 77 ++++++++++++++++++--
> > include/hw/virtio/virtio-net.h | 1 +
> > monitor/qmp-cmds.c | 17 +++++
> > qapi/misc.json | 25 +++++++
> > 10 files changed, 307 insertions(+), 27 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: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-30 8:33 ` Daniel P. Berrangé
@ 2023-03-30 11:02 ` Andrew Melnichenko
0 siblings, 0 replies; 26+ messages in thread
From: Andrew Melnichenko @ 2023-03-30 11:02 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: jasowang, mst, pbonzini, marcandre.lureau, thuth, philmd, armbru,
eblake, qemu-devel, toke, mprivozn, yuri.benditovich, yan
Hi all,
On Thu, Mar 30, 2023 at 11:33 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Thu, Mar 30, 2023 at 03:15:20AM +0300, Andrew Melnychenko wrote:
> > Now, the binary objects may be retrieved by id/name.
> > It would require for future qmp commands that may require specific
> > eBPF blob.
> >
> > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> > ---
> > ebpf/ebpf.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> > ebpf/ebpf.h | 25 +++++++++++++++++++++++++
> > ebpf/ebpf_rss.c | 4 ++++
> > ebpf/meson.build | 1 +
> > 4 files changed, 78 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 0000000000..86320d72f5
> > --- /dev/null
> > +++ b/ebpf/ebpf.c
> > @@ -0,0 +1,48 @@
> > +/*
> > + * 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 "ebpf/ebpf.h"
> > +
> > +struct ElfBinaryDataEntry {
> > + const char *id;
> > + const void * (*fn)(size_t *);
>
> It feels odd to be storing the function there, as that's just
> an artifact of how the EBPF rss program is acquired. IMHO
> this should just be
>
> const void *data;
> size_t datalen;
>
Yeah, have an idea to store data/size instead. the skeleton provides
them in function,
didn't want to make dirty hacks for the constructor. So I've passed
the function straight to
the structure.
> > +
> > + QSLIST_ENTRY(ElfBinaryDataEntry) node;
> > +};
> > +
> > +static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
> > + QSLIST_HEAD_INITIALIZER();
> > +
> > +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *))
> > +{
> > + struct ElfBinaryDataEntry *data = NULL;
> > +
> > + data = g_malloc0(sizeof(*data));
>
> We prefer g_new0 over g_malloc and initialize when declaring eg
>
> struct ElfBinaryDataEntry *data = g_new0(struct ElfBinaryDataEntry, 1);
>
Ok, thank you.
> > + data->fn = fn;
> > + data->id = id;
> > +
> > + QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, data, node);
> > +}
> > +
> > +const void *ebpf_find_binary_by_id(const char *id, size_t *sz)
> > +{
> > + struct ElfBinaryDataEntry *it = NULL;
> > + QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
> > + if (strcmp(id, it->id) == 0) {
> > + return it->fn(sz);
> > + }
> > + }
> > +
> > + return NULL;
> > +}
> > diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
> > new file mode 100644
> > index 0000000000..fd705cb73e
> > --- /dev/null
> > +++ b/ebpf/ebpf.h
> > @@ -0,0 +1,25 @@
> > +/*
> > + * 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
> > +
> > +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *));
>
> IMHO it would be better as
>
> void ebpf_register_binary_data(const char *id, const void *data, size_t datalen);
>
>
> > +const void *ebpf_find_binary_by_id(const char *id, size_t *sz);
> > +
> > +#define ebpf_binary_init(id, fn) \
> > +static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
> > +{ \
> > + ebpf_register_binary_data(id, fn); \
>
> size_t datalen;
> const void *data = fn(&datalen);
> ebpf_register_binary_data(oid, data, datalen);
>
Yeah, it can work like that. For some reason, I want that register
function and the constructor
have the same call/mention.
>
> > +}
> > +
> > +#endif /* EBPF_H */
> > diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
> > index 08015fecb1..b4038725f2 100644
> > --- a/ebpf/ebpf_rss.c
> > +++ b/ebpf/ebpf_rss.c
> > @@ -21,6 +21,8 @@
> >
> > #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)
> > @@ -237,3 +239,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
> > ctx->obj = NULL;
> > ctx->program_fd = -1;
> > }
> > +
> > +ebpf_binary_init("rss", rss_bpf__elf_bytes)
> > diff --git a/ebpf/meson.build b/ebpf/meson.build
> > index 2dd0fd8948..67c3f53aa9 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
> >
>
> 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: [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update.
2023-03-30 7:10 ` Daniel P. Berrangé
@ 2023-03-30 11:13 ` Andrew Melnichenko
0 siblings, 0 replies; 26+ messages in thread
From: Andrew Melnichenko @ 2023-03-30 11:13 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Jason Wang, mst, pbonzini, marcandre.lureau, thuth, philmd,
armbru, eblake, qemu-devel, toke, mprivozn, yuri.benditovich,
yan
Hi all,
On Thu, Mar 30, 2023 at 10:10 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Thu, Mar 30, 2023 at 02:53:16PM +0800, Jason Wang wrote:
> > On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> 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.
> >
> > This requires kernel support, so after this change, eBPF based RSS
> > doesn't work on old kernels that only support syscall based map
> > updating.
>
It would not work either - bpf_map_update_elem() requires BPF capabilities.
> What kernel version is the cut off ?
If I'm not mistaken - something like kernel 5.5<.
But in any case - the RSS eBPF program is quite big and would require features
like jumpsback.
So, on old kernels, it would not load.
>
>
> 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: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-30 8:34 ` Daniel P. Berrangé
@ 2023-03-31 7:48 ` Jason Wang
2023-03-31 7:59 ` Daniel P. Berrangé
0 siblings, 1 reply; 26+ messages in thread
From: Jason Wang @ 2023-03-31 7:48 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, mst, pbonzini, marcandre.lureau, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn,
yuri.benditovich, yan
On Thu, Mar 30, 2023 at 4:34 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Thu, Mar 30, 2023 at 02:54:32PM +0800, Jason Wang wrote:
> > On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> > >
> > > Now, the binary objects may be retrieved by id/name.
> > > It would require for future qmp commands that may require specific
> > > eBPF blob.
> > >
> > > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> > > ---
> > > ebpf/ebpf.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
> > > ebpf/ebpf.h | 25 +++++++++++++++++++++++++
> > > ebpf/ebpf_rss.c | 4 ++++
> > > ebpf/meson.build | 1 +
> > > 4 files changed, 78 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 0000000000..86320d72f5
> > > --- /dev/null
> > > +++ b/ebpf/ebpf.c
> > > @@ -0,0 +1,48 @@
> > > +/*
> > > + * 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 "ebpf/ebpf.h"
> > > +
> > > +struct ElfBinaryDataEntry {
> > > + const char *id;
> > > + const void * (*fn)(size_t *);
> > > +
> > > + QSLIST_ENTRY(ElfBinaryDataEntry) node;
> > > +};
> > > +
> > > +static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
> > > + QSLIST_HEAD_INITIALIZER();
> > > +
> > > +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *))
> > > +{
> > > + struct ElfBinaryDataEntry *data = NULL;
> > > +
> > > + data = g_malloc0(sizeof(*data));
> > > + data->fn = fn;
> > > + data->id = id;
> > > +
> > > + QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, data, node);
> > > +}
> > > +
> > > +const void *ebpf_find_binary_by_id(const char *id, size_t *sz)
> > > +{
> > > + struct ElfBinaryDataEntry *it = NULL;
> > > + QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
> > > + if (strcmp(id, it->id) == 0) {
> > > + return it->fn(sz);
> > > + }
> > > + }
> > > +
> > > + return NULL;
> > > +}
> > > diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
> > > new file mode 100644
> > > index 0000000000..fd705cb73e
> > > --- /dev/null
> > > +++ b/ebpf/ebpf.h
> > > @@ -0,0 +1,25 @@
> > > +/*
> > > + * 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
> > > +
> > > +void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *));
> > > +const void *ebpf_find_binary_by_id(const char *id, size_t *sz);
> > > +
> > > +#define ebpf_binary_init(id, fn) \
> > > +static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
> > > +{ \
> > > + ebpf_register_binary_data(id, fn); \
> > > +}
> > > +
> > > +#endif /* EBPF_H */
> > > diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
> > > index 08015fecb1..b4038725f2 100644
> > > --- a/ebpf/ebpf_rss.c
> > > +++ b/ebpf/ebpf_rss.c
> > > @@ -21,6 +21,8 @@
> > >
> > > #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)
> > > @@ -237,3 +239,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
> > > ctx->obj = NULL;
> > > ctx->program_fd = -1;
> > > }
> > > +
> > > +ebpf_binary_init("rss", rss_bpf__elf_bytes)
> >
> > Who or how the ABI compatibility is preserved between libvirt and Qemu?
>
> There's no real problem with binary compatibility to solve any more.
>
> When libvirt first launches a QEMU VM, it will fetch the eBPF programs
> it needs from that running QEMU using QMP. WHen it later needs to
> enable features that use eBPF, it already has the program data that
> matches the running QEMU
Ok, then who will validate the eBPF program? I don't think libvirt can
trust what is received from Qemu otherwise arbitrary eBPF programs
could be executed by Qemu in this way. One example is that when guests
escape to Qemu it can modify the rss_bpf__elf_bytes. Though
BPF_PROG_TYPE_SOCKET_FILTER gives some of the restrictions, we still
need to evaluate side effects of this. Or we need to find other ways
like using the binary in libvirt or use rx filter events.
Thanks
>
>
> 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: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-31 7:48 ` Jason Wang
@ 2023-03-31 7:59 ` Daniel P. Berrangé
2023-03-31 8:03 ` Jason Wang
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-03-31 7:59 UTC (permalink / raw)
To: Jason Wang
Cc: Andrew Melnychenko, mst, pbonzini, marcandre.lureau, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn,
yuri.benditovich, yan
On Fri, Mar 31, 2023 at 03:48:18PM +0800, Jason Wang wrote:
> On Thu, Mar 30, 2023 at 4:34 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> >
> > On Thu, Mar 30, 2023 at 02:54:32PM +0800, Jason Wang wrote:
> > > On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> > >
> > > Who or how the ABI compatibility is preserved between libvirt and Qemu?
> >
> > There's no real problem with binary compatibility to solve any more.
> >
> > When libvirt first launches a QEMU VM, it will fetch the eBPF programs
> > it needs from that running QEMU using QMP. WHen it later needs to
> > enable features that use eBPF, it already has the program data that
> > matches the running QEMU
>
> Ok, then who will validate the eBPF program? I don't think libvirt can
> trust what is received from Qemu otherwise arbitrary eBPF programs
> could be executed by Qemu in this way. One example is that when guests
> escape to Qemu it can modify the rss_bpf__elf_bytes. Though
> BPF_PROG_TYPE_SOCKET_FILTER gives some of the restrictions, we still
> need to evaluate side effects of this. Or we need to find other ways
> like using the binary in libvirt or use rx filter events.
As I mentioned, when libvirt first launches QEMU it will fetch the
eBPF programs and keep them for later use. At that point the guest
CPUs haven't started running, and so QEMU it still sufficiently
trustworthy.
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: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-31 7:59 ` Daniel P. Berrangé
@ 2023-03-31 8:03 ` Jason Wang
2023-03-31 8:13 ` Daniel P. Berrangé
0 siblings, 1 reply; 26+ messages in thread
From: Jason Wang @ 2023-03-31 8:03 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, mst, pbonzini, marcandre.lureau, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn,
yuri.benditovich, yan
On Fri, Mar 31, 2023 at 3:59 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Fri, Mar 31, 2023 at 03:48:18PM +0800, Jason Wang wrote:
> > On Thu, Mar 30, 2023 at 4:34 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> > >
> > > On Thu, Mar 30, 2023 at 02:54:32PM +0800, Jason Wang wrote:
> > > > On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> > > >
> > > > Who or how the ABI compatibility is preserved between libvirt and Qemu?
> > >
> > > There's no real problem with binary compatibility to solve any more.
> > >
> > > When libvirt first launches a QEMU VM, it will fetch the eBPF programs
> > > it needs from that running QEMU using QMP. WHen it later needs to
> > > enable features that use eBPF, it already has the program data that
> > > matches the running QEMU
> >
> > Ok, then who will validate the eBPF program? I don't think libvirt can
> > trust what is received from Qemu otherwise arbitrary eBPF programs
> > could be executed by Qemu in this way. One example is that when guests
> > escape to Qemu it can modify the rss_bpf__elf_bytes. Though
> > BPF_PROG_TYPE_SOCKET_FILTER gives some of the restrictions, we still
> > need to evaluate side effects of this. Or we need to find other ways
> > like using the binary in libvirt or use rx filter events.
>
> As I mentioned, when libvirt first launches QEMU it will fetch the
> eBPF programs and keep them for later use. At that point the guest
> CPUs haven't started running, and so QEMU it still sufficiently
> trustworthy.
Well, this means the QMP command is safe only before Qemu starts to
run VCPU. I'm not sure this is a good design. Or at least we need to
fail the QMP command if VCPU starts to run.
Thanks
>
> 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: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-31 8:03 ` Jason Wang
@ 2023-03-31 8:13 ` Daniel P. Berrangé
2023-03-31 8:21 ` Jason Wang
0 siblings, 1 reply; 26+ messages in thread
From: Daniel P. Berrangé @ 2023-03-31 8:13 UTC (permalink / raw)
To: Jason Wang
Cc: Andrew Melnychenko, mst, pbonzini, marcandre.lureau, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn,
yuri.benditovich, yan
On Fri, Mar 31, 2023 at 04:03:39PM +0800, Jason Wang wrote:
> On Fri, Mar 31, 2023 at 3:59 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> >
> > On Fri, Mar 31, 2023 at 03:48:18PM +0800, Jason Wang wrote:
> > > On Thu, Mar 30, 2023 at 4:34 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> > > >
> > > > On Thu, Mar 30, 2023 at 02:54:32PM +0800, Jason Wang wrote:
> > > > > On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> > > > >
> > > > > Who or how the ABI compatibility is preserved between libvirt and Qemu?
> > > >
> > > > There's no real problem with binary compatibility to solve any more.
> > > >
> > > > When libvirt first launches a QEMU VM, it will fetch the eBPF programs
> > > > it needs from that running QEMU using QMP. WHen it later needs to
> > > > enable features that use eBPF, it already has the program data that
> > > > matches the running QEMU
> > >
> > > Ok, then who will validate the eBPF program? I don't think libvirt can
> > > trust what is received from Qemu otherwise arbitrary eBPF programs
> > > could be executed by Qemu in this way. One example is that when guests
> > > escape to Qemu it can modify the rss_bpf__elf_bytes. Though
> > > BPF_PROG_TYPE_SOCKET_FILTER gives some of the restrictions, we still
> > > need to evaluate side effects of this. Or we need to find other ways
> > > like using the binary in libvirt or use rx filter events.
> >
> > As I mentioned, when libvirt first launches QEMU it will fetch the
> > eBPF programs and keep them for later use. At that point the guest
> > CPUs haven't started running, and so QEMU it still sufficiently
> > trustworthy.
>
> Well, this means the QMP command is safe only before Qemu starts to
> run VCPU. I'm not sure this is a good design. Or at least we need to
> fail the QMP command if VCPU starts to run.
Currently QEMU has the ability to just create the eBPF programs itself
at will, when it is launched in a privileged scenario regardless of
guest CPU state. In terms of QMP, the reporting of QEMU PIDs for its
various vCPU, I/O threads is also not to be trusted after vCPU starts
if the guest workload is not trustworthy. I feel this is more of docs
problem to explain the caveats that apps should be aware of.
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: [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-31 8:13 ` Daniel P. Berrangé
@ 2023-03-31 8:21 ` Jason Wang
0 siblings, 0 replies; 26+ messages in thread
From: Jason Wang @ 2023-03-31 8:21 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: Andrew Melnychenko, mst, pbonzini, marcandre.lureau, thuth,
philmd, armbru, eblake, qemu-devel, toke, mprivozn,
yuri.benditovich, yan
On Fri, Mar 31, 2023 at 4:13 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Fri, Mar 31, 2023 at 04:03:39PM +0800, Jason Wang wrote:
> > On Fri, Mar 31, 2023 at 3:59 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> > >
> > > On Fri, Mar 31, 2023 at 03:48:18PM +0800, Jason Wang wrote:
> > > > On Thu, Mar 30, 2023 at 4:34 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> > > > >
> > > > > On Thu, Mar 30, 2023 at 02:54:32PM +0800, Jason Wang wrote:
> > > > > > On Thu, Mar 30, 2023 at 8:33 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> > > > > >
> > > > > > Who or how the ABI compatibility is preserved between libvirt and Qemu?
> > > > >
> > > > > There's no real problem with binary compatibility to solve any more.
> > > > >
> > > > > When libvirt first launches a QEMU VM, it will fetch the eBPF programs
> > > > > it needs from that running QEMU using QMP. WHen it later needs to
> > > > > enable features that use eBPF, it already has the program data that
> > > > > matches the running QEMU
> > > >
> > > > Ok, then who will validate the eBPF program? I don't think libvirt can
> > > > trust what is received from Qemu otherwise arbitrary eBPF programs
> > > > could be executed by Qemu in this way. One example is that when guests
> > > > escape to Qemu it can modify the rss_bpf__elf_bytes. Though
> > > > BPF_PROG_TYPE_SOCKET_FILTER gives some of the restrictions, we still
> > > > need to evaluate side effects of this. Or we need to find other ways
> > > > like using the binary in libvirt or use rx filter events.
> > >
> > > As I mentioned, when libvirt first launches QEMU it will fetch the
> > > eBPF programs and keep them for later use. At that point the guest
> > > CPUs haven't started running, and so QEMU it still sufficiently
> > > trustworthy.
> >
> > Well, this means the QMP command is safe only before Qemu starts to
> > run VCPU. I'm not sure this is a good design. Or at least we need to
> > fail the QMP command if VCPU starts to run.
>
> Currently QEMU has the ability to just create the eBPF programs itself
> at will, when it is launched in a privileged scenario regardless of
> guest CPU state. In terms of QMP, the reporting of QEMU PIDs for its
> various vCPU, I/O threads is also not to be trusted after vCPU starts
> if the guest workload is not trustworthy.
Indeed.
> I feel this is more of docs
> problem to explain the caveats that apps should be aware of.
Ok, we can probably document this and in the future we probably need
to address them.
Thanks
>
>
> 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
* [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-03-29 10:45 Andrew Melnychenko
@ 2023-03-29 10:45 ` Andrew Melnychenko
0 siblings, 0 replies; 26+ messages in thread
From: Andrew Melnychenko @ 2023-03-29 10:45 UTC (permalink / raw)
To: davem, edumazet, kuba, pabeni, mst, jasowang, yoshfuji, dsahern,
netdev, linux-kernel, virtualization
Cc: yan, yuri.benditovich
Now, the binary objects may be retrieved by id/name.
It would require for future qmp commands that may require specific
eBPF blob.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/ebpf.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
ebpf/ebpf.h | 25 +++++++++++++++++++++++++
ebpf/ebpf_rss.c | 4 ++++
ebpf/meson.build | 1 +
4 files changed, 78 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 0000000000..86320d72f5
--- /dev/null
+++ b/ebpf/ebpf.c
@@ -0,0 +1,48 @@
+/*
+ * 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 "ebpf/ebpf.h"
+
+struct ElfBinaryDataEntry {
+ const char *id;
+ const void * (*fn)(size_t *);
+
+ QSLIST_ENTRY(ElfBinaryDataEntry) node;
+};
+
+static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
+ QSLIST_HEAD_INITIALIZER();
+
+void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *))
+{
+ struct ElfBinaryDataEntry *data = NULL;
+
+ data = g_malloc0(sizeof(*data));
+ data->fn = fn;
+ data->id = id;
+
+ QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, data, node);
+}
+
+const void *ebpf_find_binary_by_id(const char *id, size_t *sz)
+{
+ struct ElfBinaryDataEntry *it = NULL;
+ QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
+ if (strcmp(id, it->id) == 0) {
+ return it->fn(sz);
+ }
+ }
+
+ return NULL;
+}
diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
new file mode 100644
index 0000000000..fd705cb73e
--- /dev/null
+++ b/ebpf/ebpf.h
@@ -0,0 +1,25 @@
+/*
+ * 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
+
+void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *));
+const void *ebpf_find_binary_by_id(const char *id, size_t *sz);
+
+#define ebpf_binary_init(id, fn) \
+static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
+{ \
+ ebpf_register_binary_data(id, fn); \
+}
+
+#endif /* EBPF_H */
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 08015fecb1..b4038725f2 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -21,6 +21,8 @@
#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)
@@ -237,3 +239,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
ctx->obj = NULL;
ctx->program_fd = -1;
}
+
+ebpf_binary_init("rss", rss_bpf__elf_bytes)
diff --git a/ebpf/meson.build b/ebpf/meson.build
index 2dd0fd8948..67c3f53aa9 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
* [RFC PATCH 3/5] ebpf: Added declaration/initialization routines.
@ 2023-03-29 10:45 ` Andrew Melnychenko
0 siblings, 0 replies; 26+ messages in thread
From: Andrew Melnychenko @ 2023-03-29 10:45 UTC (permalink / raw)
To: davem, edumazet, kuba, pabeni, mst, jasowang, yoshfuji, dsahern,
netdev, linux-kernel, virtualization
Cc: yan, yuri.benditovich
Now, the binary objects may be retrieved by id/name.
It would require for future qmp commands that may require specific
eBPF blob.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/ebpf.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
ebpf/ebpf.h | 25 +++++++++++++++++++++++++
ebpf/ebpf_rss.c | 4 ++++
ebpf/meson.build | 1 +
4 files changed, 78 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 0000000000..86320d72f5
--- /dev/null
+++ b/ebpf/ebpf.c
@@ -0,0 +1,48 @@
+/*
+ * 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 "ebpf/ebpf.h"
+
+struct ElfBinaryDataEntry {
+ const char *id;
+ const void * (*fn)(size_t *);
+
+ QSLIST_ENTRY(ElfBinaryDataEntry) node;
+};
+
+static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
+ QSLIST_HEAD_INITIALIZER();
+
+void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *))
+{
+ struct ElfBinaryDataEntry *data = NULL;
+
+ data = g_malloc0(sizeof(*data));
+ data->fn = fn;
+ data->id = id;
+
+ QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, data, node);
+}
+
+const void *ebpf_find_binary_by_id(const char *id, size_t *sz)
+{
+ struct ElfBinaryDataEntry *it = NULL;
+ QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
+ if (strcmp(id, it->id) == 0) {
+ return it->fn(sz);
+ }
+ }
+
+ return NULL;
+}
diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
new file mode 100644
index 0000000000..fd705cb73e
--- /dev/null
+++ b/ebpf/ebpf.h
@@ -0,0 +1,25 @@
+/*
+ * 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
+
+void ebpf_register_binary_data(const char *id, const void * (*fn)(size_t *));
+const void *ebpf_find_binary_by_id(const char *id, size_t *sz);
+
+#define ebpf_binary_init(id, fn) \
+static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
+{ \
+ ebpf_register_binary_data(id, fn); \
+}
+
+#endif /* EBPF_H */
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 08015fecb1..b4038725f2 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -21,6 +21,8 @@
#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)
@@ -237,3 +239,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
ctx->obj = NULL;
ctx->program_fd = -1;
}
+
+ebpf_binary_init("rss", rss_bpf__elf_bytes)
diff --git a/ebpf/meson.build b/ebpf/meson.build
index 2dd0fd8948..67c3f53aa9 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
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^ permalink raw reply related [flat|nested] 26+ messages in thread
end of thread, other threads:[~2023-03-31 8:22 UTC | newest]
Thread overview: 26+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-03-30 0:15 [RFC PATCH 0/4] eBPF RSS through QMP support Andrew Melnychenko
2023-03-30 0:15 ` [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
2023-03-30 6:53 ` Jason Wang
2023-03-30 6:56 ` Jason Wang
2023-03-30 7:10 ` Daniel P. Berrangé
2023-03-30 11:13 ` Andrew Melnichenko
2023-03-30 0:15 ` [RFC PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
2023-03-30 8:52 ` Daniel P. Berrangé
2023-03-30 0:15 ` [RFC PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
2023-03-30 6:54 ` Jason Wang
2023-03-30 8:34 ` Daniel P. Berrangé
2023-03-31 7:48 ` Jason Wang
2023-03-31 7:59 ` Daniel P. Berrangé
2023-03-31 8:03 ` Jason Wang
2023-03-31 8:13 ` Daniel P. Berrangé
2023-03-31 8:21 ` Jason Wang
2023-03-30 8:33 ` Daniel P. Berrangé
2023-03-30 11:02 ` Andrew Melnichenko
2023-03-30 0:15 ` [RFC PATCH 4/5] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
2023-03-30 8:39 ` Daniel P. Berrangé
2023-03-30 10:42 ` Andrew Melnichenko
2023-03-30 0:15 ` [RFC PATCH 5/5] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
2023-03-30 6:57 ` [RFC PATCH 0/4] eBPF RSS through QMP support Jason Wang
2023-03-30 10:48 ` Andrew Melnichenko
-- strict thread matches above, loose matches on Subject: below --
2023-03-29 10:45 Andrew Melnychenko
2023-03-29 10:45 ` [RFC PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
2023-03-29 10:45 ` Andrew Melnychenko
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