* [PATCH 0/5] eBPF RSS through QMP support.
@ 2023-05-01 7:20 Andrew Melnychenko
2023-05-01 7:20 ` [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
` (5 more replies)
0 siblings, 6 replies; 14+ messages in thread
From: Andrew Melnychenko @ 2023-05-01 7:20 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
This series of patches provides the ability to retrieve eBPF program
through qmp, so management application may load bpf blob with proper capabilities.
Now, virtio-net devices can accept eBPF programs and maps through properties
as external file descriptors. Access to the eBPF map is direct through mmap()
call, so it should not require additional capabilities to bpf* calls.
eBPF file descriptors can be passed to QEMU from parent process or by unix
socket with sendfd() qmp command.
Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
Andrew Melnychenko (5):
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: Updated eBPF program and skeleton.
ebpf/ebpf.c | 54 ++
ebpf/ebpf.h | 31 +
ebpf/ebpf_rss-stub.c | 6 +
ebpf/ebpf_rss.c | 124 ++-
ebpf/ebpf_rss.h | 10 +
ebpf/meson.build | 1 +
ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++----------------
hw/net/virtio-net.c | 96 ++-
include/hw/virtio/virtio-net.h | 1 +
monitor/qmp-cmds.c | 16 +
qapi/misc.json | 28 +
tools/ebpf/rss.bpf.c | 2 +-
12 files changed, 1079 insertions(+), 759 deletions(-)
create mode 100644 ebpf/ebpf.c
create mode 100644 ebpf/ebpf.h
--
2.39.1
^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update.
2023-05-01 7:20 [PATCH 0/5] eBPF RSS through QMP support Andrew Melnychenko
@ 2023-05-01 7:20 ` Andrew Melnychenko
2023-05-03 11:07 ` Daniel P. Berrangé
2023-05-01 7:20 ` [PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
` (4 subsequent siblings)
5 siblings, 1 reply; 14+ messages in thread
From: Andrew Melnychenko @ 2023-05-01 7:20 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
Changed eBPF map updates through mmaped array.
Mmaped arrays provide direct access to map data.
It should omit using bpf_map_update_elem() call,
which may require capabilities that are not present.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/ebpf_rss-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 e71e229190d..8d7fae2ad92 100644
--- a/ebpf/ebpf_rss-stub.c
+++ b/ebpf/ebpf_rss-stub.c
@@ -28,6 +28,12 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
return false;
}
+bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
+ int config_fd, int toeplitz_fd, int table_fd)
+{
+ return false;
+}
+
bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
uint16_t *indirections_table, uint8_t *toeplitz_key)
{
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index cee658c158b..08015fecb18 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 bf3f2572c7c..239242b0d26 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] 14+ messages in thread
* [PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds.
2023-05-01 7:20 [PATCH 0/5] eBPF RSS through QMP support Andrew Melnychenko
2023-05-01 7:20 ` [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
@ 2023-05-01 7:20 ` Andrew Melnychenko
2023-05-03 11:03 ` Daniel P. Berrangé
2023-05-01 7:20 ` [PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
` (3 subsequent siblings)
5 siblings, 1 reply; 14+ messages in thread
From: Andrew Melnychenko @ 2023-05-01 7:20 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
eBPF RSS program and maps may now be passed during initialization.
Initially was implemented for libvirt to launch qemu without permissions,
and initialized eBPF program through the helper.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
hw/net/virtio-net.c | 96 +++++++++++++++++++++++++++++++---
include/hw/virtio/virtio-net.h | 1 +
2 files changed, 91 insertions(+), 6 deletions(-)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 53e1c326433..9b3a997d872 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 +1306,96 @@ 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,
+ Error **errp)
{
- if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
- /* backend does't support steering ebpf */
- return false;
+ 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;
+ }
+ }
+
+ if (cur != NULL) {
+ /* the string contains more arguments */
+ error_setg(errp,
+ "Too many eBPF file descriptors for RSS provided.");
+ } else if (i < nfds) {
+ error_setg(errp,
+ "Not enough eBPF file descriptors for RSS were provided.");
+ }
+
+ return i;
+}
+
+static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
+{
+ char *fds_strs[EBPF_RSS_MAX_FDS];
+ int fds[EBPF_RSS_MAX_FDS];
+ int nfds;
+ int ret = true;
+ int i = 0;
+
+ ERRP_GUARD();
+
+ nfds = virtio_net_get_ebpf_rss_fds(n->ebpf_rss_fds,
+ fds_strs, EBPF_RSS_MAX_FDS, errp);
+ if (*errp) {
+ ret = false;
+ goto exit;
}
- return ebpf_rss_load(&n->ebpf_rss);
+ for (i = 0; i < nfds; i++) {
+ fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], errp);
+ if (*errp) {
+ ret = false;
+ goto exit;
+ }
+ }
+
+ ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
+
+exit:
+ if (!ret || *errp) {
+ for (i = 0; i < nfds; 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, Error **errp)
+{
+ bool ret = false;
+
+ if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
+ if (!(n->ebpf_rss_fds
+ && virtio_net_load_ebpf_fds(n, errp))) {
+ ret = ebpf_rss_load(&n->ebpf_rss);
+ }
+ }
+
+ return ret;
}
static void virtio_net_unload_ebpf(VirtIONet *n)
@@ -3738,7 +3821,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
net_rx_pkt_init(&n->rx_pkt);
if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
- virtio_net_load_ebpf(n);
+ virtio_net_load_ebpf(n, errp);
}
}
@@ -3900,6 +3983,7 @@ static Property virtio_net_properties[] = {
VIRTIO_NET_F_RSS, false),
DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
VIRTIO_NET_F_HASH_REPORT, false),
+ DEFINE_PROP_STRING("ebpf_rss_fds", VirtIONet, ebpf_rss_fds),
DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
VIRTIO_NET_F_RSC_EXT, false),
DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index ef234ffe7ef..e10ce88f918 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -219,6 +219,7 @@ struct VirtIONet {
VirtioNetRssData rss_data;
struct NetRxPkt *rx_pkt;
struct EBPFRSSContext ebpf_rss;
+ char *ebpf_rss_fds;
};
size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
--
2.39.1
^ permalink raw reply related [flat|nested] 14+ messages in thread
* [PATCH 3/5] ebpf: Added declaration/initialization routines.
2023-05-01 7:20 [PATCH 0/5] eBPF RSS through QMP support Andrew Melnychenko
2023-05-01 7:20 ` [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
2023-05-01 7:20 ` [PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
@ 2023-05-01 7:20 ` Andrew Melnychenko
2023-05-01 7:21 ` [PATCH 4/5] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
` (2 subsequent siblings)
5 siblings, 0 replies; 14+ messages in thread
From: Andrew Melnychenko @ 2023-05-01 7:20 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +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 | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
ebpf/ebpf.h | 31 +++++++++++++++++++++++++++
ebpf/ebpf_rss.c | 4 ++++
ebpf/meson.build | 1 +
4 files changed, 90 insertions(+)
create mode 100644 ebpf/ebpf.c
create mode 100644 ebpf/ebpf.h
diff --git a/ebpf/ebpf.c b/ebpf/ebpf.c
new file mode 100644
index 00000000000..fd96f2b42f9
--- /dev/null
+++ b/ebpf/ebpf.c
@@ -0,0 +1,54 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/queue.h"
+#include "qapi/error.h"
+#include "ebpf/ebpf.h"
+
+struct ElfBinaryDataEntry {
+ const char *id;
+ const void *data;
+ size_t datalen;
+
+ QSLIST_ENTRY(ElfBinaryDataEntry) node;
+};
+
+static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
+ QSLIST_HEAD_INITIALIZER();
+
+void ebpf_register_binary_data(const char *id, const void *data, size_t datalen)
+{
+ struct ElfBinaryDataEntry *dataentry = NULL;
+
+ dataentry = g_new0(struct ElfBinaryDataEntry, 1);
+ dataentry->data = data;
+ dataentry->datalen = datalen;
+ dataentry->id = id;
+
+ QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, dataentry, node);
+}
+
+const void *ebpf_find_binary_by_id(const char *id, size_t *sz, Error **errp)
+{
+ struct ElfBinaryDataEntry *it = NULL;
+ QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
+ if (strcmp(id, it->id) == 0) {
+ *sz = it->datalen;
+ return it->data;
+ }
+ }
+
+ error_setg(errp, "can't find eBPF object with id: %s", id);
+
+ return NULL;
+}
diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
new file mode 100644
index 00000000000..36c5d455b4b
--- /dev/null
+++ b/ebpf/ebpf.h
@@ -0,0 +1,31 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
+
+#ifndef EBPF_H
+#define EBPF_H
+
+struct Error;
+
+void ebpf_register_binary_data(const char *id, const void *data,
+ size_t datalen);
+const void *ebpf_find_binary_by_id(const char *id, size_t *sz,
+ struct Error **errp);
+
+#define ebpf_binary_init(id, fn) \
+static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void) \
+{ \
+ size_t datalen = 0; \
+ const void *data = fn(&datalen); \
+ ebpf_register_binary_data(id, data, datalen); \
+}
+
+#endif /* EBPF_H */
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 08015fecb18..b4038725f23 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 2dd0fd89480..67c3f53aa9d 100644
--- a/ebpf/meson.build
+++ b/ebpf/meson.build
@@ -1 +1,2 @@
+softmmu_ss.add(files('ebpf.c'))
softmmu_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
--
2.39.1
^ permalink raw reply related [flat|nested] 14+ messages in thread
* [PATCH 4/5] qmp: Added new command to retrieve eBPF blob.
2023-05-01 7:20 [PATCH 0/5] eBPF RSS through QMP support Andrew Melnychenko
` (2 preceding siblings ...)
2023-05-01 7:20 ` [PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
@ 2023-05-01 7:21 ` Andrew Melnychenko
2023-05-03 11:09 ` Daniel P. Berrangé
2023-05-01 7:21 ` [PATCH 5/5] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
2023-05-03 8:22 ` [PATCH 0/5] eBPF RSS through QMP support Daniel P. Berrangé
5 siblings, 1 reply; 14+ messages in thread
From: Andrew Melnychenko @ 2023-05-01 7:21 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
Added command "request-ebpf". This command returns
eBPF program encoded base64. The program taken from the
skeleton and essentially is an ELF object that can be
loaded in the future with libbpf.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
monitor/qmp-cmds.c | 16 ++++++++++++++++
qapi/misc.json | 28 ++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index b0f948d3376..f7641bb55b9 100644
--- a/monitor/qmp-cmds.c
+++ b/monitor/qmp-cmds.c
@@ -32,6 +32,7 @@
#include "hw/mem/memory-device.h"
#include "hw/intc/intc.h"
#include "hw/rdma/rdma.h"
+#include "ebpf/ebpf.h"
NameInfo *qmp_query_name(Error **errp)
{
@@ -209,3 +210,18 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
qmp_marshal_qmp_capabilities,
QCO_ALLOW_PRECONFIG, 0);
}
+
+EbpfObject *qmp_request_ebpf(const char *id, Error **errp)
+{
+ EbpfObject *ret = NULL;
+ size_t size = 0;
+ const void *data = ebpf_find_binary_by_id(id, &size, errp);
+ if (!data) {
+ return NULL;
+ }
+
+ ret = g_new0(EbpfObject, 1);
+ ret->object = g_base64_encode(data, size);
+
+ return ret;
+}
diff --git a/qapi/misc.json b/qapi/misc.json
index 6ddd16ea283..81613fd1b13 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -618,3 +618,31 @@
{ 'event': 'VFU_CLIENT_HANGUP',
'data': { 'vfu-id': 'str', 'vfu-qom-path': 'str',
'dev-id': 'str', 'dev-qom-path': 'str' } }
+
+##
+# @EbpfObject:
+#
+# Structure that holds eBPF ELF object encoded in base64.
+#
+# Since: 8.1
+#
+##
+{ 'struct': 'EbpfObject',
+ 'data': {'object': 'str'} }
+
+##
+# @request-ebpf:
+#
+# Function returns eBPF object that can be loaded with libbpf.
+# Management applications (g.e. libvirt) may load it and pass file
+# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
+#
+# Returns: RSS eBPF object encoded in base64.
+#
+# Since: 8.1
+#
+##
+{ 'command': 'request-ebpf',
+ 'data': { 'id': 'str' },
+ 'returns': 'EbpfObject' }
+
--
2.39.1
^ permalink raw reply related [flat|nested] 14+ messages in thread
* [PATCH 5/5] ebpf: Updated eBPF program and skeleton.
2023-05-01 7:20 [PATCH 0/5] eBPF RSS through QMP support Andrew Melnychenko
` (3 preceding siblings ...)
2023-05-01 7:21 ` [PATCH 4/5] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
@ 2023-05-01 7:21 ` Andrew Melnychenko
2023-05-03 8:22 ` [PATCH 0/5] eBPF RSS through QMP support Daniel P. Berrangé
5 siblings, 0 replies; 14+ messages in thread
From: Andrew Melnychenko @ 2023-05-01 7:21 UTC (permalink / raw)
To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan
Updated section name, so libbpf should init/gues proper
program type without specifications during open/load.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++++++-------------------
tools/ebpf/rss.bpf.c | 2 +-
2 files changed, 741 insertions(+), 730 deletions(-)
diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
index 18eb2adb12c..41b84aea44c 100644
--- a/ebpf/rss.bpf.skeleton.h
+++ b/ebpf/rss.bpf.skeleton.h
@@ -176,162 +176,162 @@ err:
static inline const void *rss_bpf__elf_bytes(size_t *sz)
{
- *sz = 20440;
+ *sz = 20720;
return (const void *)"\
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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\
+\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x08\0\0\0\0\0\0\
-\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x67\x02\0\0\0\0\xbf\x87\0\0\
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-\0\x5e\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc8\xff\0\0\0\0\x7b\x1a\xc0\xff\
-\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\
-\0\x63\x1a\xa0\xff\0\0\0\0\x7b\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\
-\x1a\x88\xff\0\0\0\0\x7b\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\
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-\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\
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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\
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+\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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-\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\
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+\0\x7b\x1a\xd8\xff\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\x7b\x1a\xc8\xff\0\0\0\0\xbf\
+\xa3\0\0\0\0\0\0\x07\x03\0\0\xc8\xff\xff\xff\xb7\x01\0\0\x28\0\0\0\x7b\x1a\x40\
\xff\0\0\0\0\xbf\x91\0\0\0\0\0\0\xb7\x02\0\0\0\0\0\0\xb7\x04\0\0\x28\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\xfe\0\0\0\0\0\x79\xa1\xe0\xff\0\0\0\0\x63\x1a\x6c\xff\0\0\0\0\x77\x01\0\
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-\xff\0\0\0\0\x6b\x5a\xca\xff\0\0\0\0\x69\xa5\x60\xff\0\0\0\0\x6b\x5a\xc8\xff\0\
-\0\0\0\x67\x03\0\0\x20\0\0\0\x4f\x43\0\0\0\0\0\0\x7b\x3a\xc0\xff\0\0\0\0\x67\
-\x02\0\0\x20\0\0\0\x4f\x12\0\0\0\0\0\0\x7b\x2a\xb8\xff\0\0\0\0\x05\0\x6b\0\0\0\
-\0\0\x71\xa2\x5a\xff\0\0\0\0\x15\x02\x04\0\0\0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\
+\0\0\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x0f\x23\0\0\0\0\0\0\x61\x31\0\0\0\0\0\0\
+\x61\x32\x04\0\0\0\0\0\x61\x34\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x69\xa5\x5a\
+\xff\0\0\0\0\x6b\x5a\xc2\xff\0\0\0\0\x69\xa5\x58\xff\0\0\0\0\x6b\x5a\xc0\xff\0\
+\0\0\0\x67\x03\0\0\x20\0\0\0\x4f\x43\0\0\0\0\0\0\x7b\x3a\xb8\xff\0\0\0\0\x67\
+\x02\0\0\x20\0\0\0\x4f\x12\0\0\0\0\0\0\x7b\x2a\xb0\xff\0\0\0\0\x05\0\x6b\0\0\0\
+\0\0\x71\xa2\x52\xff\0\0\0\0\x15\x02\x04\0\0\0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\
\0\0\x04\0\0\0\x15\x02\x01\0\0\0\0\0\x05\0\xf1\xfe\0\0\0\0\x57\x01\0\0\x01\0\0\
-\0\x15\x01\xd0\0\0\0\0\0\x61\xa1\x64\xff\0\0\0\0\x63\x1a\xa8\xff\0\0\0\0\x61\
-\xa1\x68\xff\0\0\0\0\x63\x1a\xac\xff\0\0\0\0\x05\0\x5e\0\0\0\0\0\xb7\x09\0\0\
-\x3c\0\0\0\x79\xa8\x28\xff\0\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x15\
-\0\xac\xff\0\0\0\0\x05\0\xc5\0\0\0\0\0\x71\xa2\x5a\xff\0\0\0\0\x15\x02\x26\0\0\
+\0\x15\x01\xcd\0\0\0\0\0\x61\xa1\x5c\xff\0\0\0\0\x63\x1a\xa0\xff\0\0\0\0\x61\
+\xa1\x60\xff\0\0\0\0\x63\x1a\xa4\xff\0\0\0\0\x05\0\x5e\0\0\0\0\0\xb7\x09\0\0\
+\x3c\0\0\0\x79\xa8\x20\xff\0\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x15\
+\0\xac\xff\0\0\0\0\x05\0\xc2\0\0\0\0\0\x71\xa2\x52\xff\0\0\0\0\x15\x02\x26\0\0\
\0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x20\0\0\0\x15\x02\x23\0\0\0\0\0\x57\x01\
\0\0\0\x01\0\0\xb7\x02\0\0\x10\0\0\0\xb7\x03\0\0\x10\0\0\0\x15\x01\x01\0\0\0\0\
-\0\xb7\x03\0\0\x30\0\0\0\x71\xa4\x5d\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\
-\0\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x64\xff\xff\xff\xbf\x34\0\0\0\0\0\
-\0\x15\x01\x02\0\0\0\0\0\xbf\xa4\0\0\0\0\0\0\x07\x04\0\0\x84\xff\xff\xff\x71\
-\xa5\x5c\xff\0\0\0\0\xbf\x31\0\0\0\0\0\0\x15\x05\xbd\xff\0\0\0\0\x05\0\xbb\xff\
-\0\0\0\0\xb7\x01\0\0\x01\0\0\0\x73\x1a\x5a\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\
-\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\xd0\xff\xff\xff\x79\xa1\
-\x40\xff\0\0\0\0\x79\xa2\x48\xff\0\0\0\0\xb7\x04\0\0\x08\0\0\0\xb7\x05\0\0\x01\
-\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\xa0\0\
+\0\xb7\x03\0\0\x30\0\0\0\x71\xa4\x55\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\
+\0\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x5c\xff\xff\xff\xbf\x34\0\0\0\0\0\
+\0\x15\x01\x02\0\0\0\0\0\xbf\xa4\0\0\0\0\0\0\x07\x04\0\0\x7c\xff\xff\xff\x71\
+\xa5\x54\xff\0\0\0\0\xbf\x31\0\0\0\0\0\0\x15\x05\xbd\xff\0\0\0\0\x05\0\xbb\xff\
+\0\0\0\0\xb7\x01\0\0\x01\0\0\0\x73\x1a\x52\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\
+\x1a\xc8\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\xc8\xff\xff\xff\x79\xa1\
+\x38\xff\0\0\0\0\x79\xa2\x40\xff\0\0\0\0\xb7\x04\0\0\x08\0\0\0\xb7\x05\0\0\x01\
+\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\x9d\0\
\0\0\0\0\x05\0\xa8\xfe\0\0\0\0\x15\x09\xf3\xfe\x87\0\0\0\x05\0\x83\xff\0\0\0\0\
-\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x08\0\0\0\x15\x02\x9a\0\0\0\0\0\x57\x01\0\0\
+\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x08\0\0\0\x15\x02\x97\0\0\0\0\0\x57\x01\0\0\
\x40\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\x03\0\0\x0c\0\0\0\x15\x01\x01\0\0\0\0\0\
-\xb7\x03\0\0\x2c\0\0\0\x71\xa4\x5c\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\0\
-\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x58\xff\xff\xff\x0f\x23\0\0\0\0\0\0\
+\xb7\x03\0\0\x2c\0\0\0\x71\xa4\x54\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\0\
+\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x50\xff\xff\xff\x0f\x23\0\0\0\0\0\0\
\x61\x32\x04\0\0\0\0\0\x67\x02\0\0\x20\0\0\0\x61\x34\0\0\0\0\0\0\x4f\x42\0\0\0\
-\0\0\0\x7b\x2a\xa8\xff\0\0\0\0\x61\x32\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x67\
-\x03\0\0\x20\0\0\0\x4f\x23\0\0\0\0\0\0\x7b\x3a\xb0\xff\0\0\0\0\x71\xa2\x5d\xff\
-\0\0\0\0\x15\x02\x0c\0\0\0\0\0\x15\x01\x0b\0\0\0\0\0\x61\xa1\xa0\xff\0\0\0\0\
-\x67\x01\0\0\x20\0\0\0\x61\xa2\x9c\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xc0\
-\xff\0\0\0\0\x61\xa1\x98\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x94\xff\0\0\
+\0\0\0\x7b\x2a\xa0\xff\0\0\0\0\x61\x32\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x67\
+\x03\0\0\x20\0\0\0\x4f\x23\0\0\0\0\0\0\x7b\x3a\xa8\xff\0\0\0\0\x71\xa2\x55\xff\
+\0\0\0\0\x15\x02\x0c\0\0\0\0\0\x15\x01\x0b\0\0\0\0\0\x61\xa1\x98\xff\0\0\0\0\
+\x67\x01\0\0\x20\0\0\0\x61\xa2\x94\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb8\
+\xff\0\0\0\0\x61\xa1\x90\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x8c\xff\0\0\
\0\0\x05\0\x0a\0\0\0\0\0\xb7\x09\0\0\x2b\0\0\0\x05\0\xae\xff\0\0\0\0\x61\xa1\
-\x80\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x7c\xff\0\0\0\0\x4f\x21\0\0\0\0\
-\0\0\x7b\x1a\xc0\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\
-\xa2\x74\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\xb7\x02\0\0\0\
+\x78\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x74\xff\0\0\0\0\x4f\x21\0\0\0\0\
+\0\0\x7b\x1a\xb8\xff\0\0\0\0\x61\xa1\x70\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\
+\xa2\x6c\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\xb7\x02\0\0\0\
\0\0\0\x07\x08\0\0\x04\0\0\0\x61\x03\0\0\0\0\0\0\xb7\x05\0\0\0\0\0\0\xbf\xa1\0\
-\0\0\0\0\0\x07\x01\0\0\xa8\xff\xff\xff\x0f\x21\0\0\0\0\0\0\x71\x14\0\0\0\0\0\0\
+\0\0\0\0\0\x07\x01\0\0\xa0\xff\xff\xff\x0f\x21\0\0\0\0\0\0\x71\x14\0\0\0\0\0\0\
\xbf\x41\0\0\0\0\0\0\x67\x01\0\0\x38\0\0\0\xc7\x01\0\0\x3f\0\0\0\x5f\x31\0\0\0\
\0\0\0\xaf\x51\0\0\0\0\0\0\xbf\x85\0\0\0\0\0\0\x0f\x25\0\0\0\0\0\0\x71\x55\0\0\
\0\0\0\0\x67\x03\0\0\x01\0\0\0\xbf\x50\0\0\0\0\0\0\x77\0\0\0\x07\0\0\0\x4f\x03\
@@ -353,619 +353,630 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
\0\x57\0\0\0\x01\0\0\0\x67\x03\0\0\x01\0\0\0\x4f\x03\0\0\0\0\0\0\x57\x04\0\0\
\x01\0\0\0\x87\x04\0\0\0\0\0\0\x5f\x34\0\0\0\0\0\0\xaf\x41\0\0\0\0\0\0\x57\x05\
\0\0\x01\0\0\0\x67\x03\0\0\x01\0\0\0\x4f\x53\0\0\0\0\0\0\x07\x02\0\0\x01\0\0\0\
-\xbf\x15\0\0\0\0\0\0\x15\x02\x01\0\x24\0\0\0\x05\0\xa9\xff\0\0\0\0\xbf\x12\0\0\
-\0\0\0\0\x67\x02\0\0\x20\0\0\0\x77\x02\0\0\x20\0\0\0\x15\x02\x0e\0\0\0\0\0\x71\
-\x63\x06\0\0\0\0\0\x71\x64\x07\0\0\0\0\0\x67\x04\0\0\x08\0\0\0\x4f\x34\0\0\0\0\
-\0\0\x3f\x42\0\0\0\0\0\0\x2f\x42\0\0\0\0\0\0\x1f\x21\0\0\0\0\0\0\x63\x1a\x58\
-\xff\0\0\0\0\xbf\xa2\0\0\0\0\0\0\x07\x02\0\0\x58\xff\xff\xff\x18\x01\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\x55\0\x05\0\0\0\0\0\x71\x61\x08\0\0\0\0\
-\0\x71\x60\x09\0\0\0\0\0\x67\0\0\0\x08\0\0\0\x4f\x10\0\0\0\0\0\0\x95\0\0\0\0\0\
-\0\0\x69\0\0\0\0\0\0\0\x05\0\xfd\xff\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\xbf\x15\0\0\0\0\0\0\x15\x02\x01\0\x24\0\0\0\x05\0\xa9\xff\0\0\0\0\x67\x01\0\0\
+\x20\0\0\0\x77\x01\0\0\x20\0\0\0\x15\x01\x0c\0\0\0\0\0\x71\x62\x06\0\0\0\0\0\
+\x71\x63\x07\0\0\0\0\0\x67\x03\0\0\x08\0\0\0\x4f\x23\0\0\0\0\0\0\x9f\x31\0\0\0\
+\0\0\0\x63\x1a\x50\xff\0\0\0\0\xbf\xa2\0\0\0\0\0\0\x07\x02\0\0\x50\xff\xff\xff\
+\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\x55\0\x05\0\0\0\0\0\
+\x71\x61\x08\0\0\0\0\0\x71\x60\x09\0\0\0\0\0\x67\0\0\0\x08\0\0\0\x4f\x10\0\0\0\
+\0\0\0\x95\0\0\0\0\0\0\0\x69\0\0\0\0\0\0\0\x05\0\xfd\xff\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\x47\x50\x4c\x20\x76\x32\0\0\x9f\xeb\x01\0\x18\0\0\0\0\0\0\0\x10\x05\0\0\x10\
-\x05\0\0\x65\x11\0\0\0\0\0\0\0\0\0\x02\x03\0\0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\
-\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x02\0\0\0\x05\0\0\0\
-\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\x02\x06\0\0\0\0\0\0\0\0\0\0\x03\0\
-\0\0\0\x02\0\0\0\x04\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\x02\x08\0\0\0\0\0\0\0\0\0\0\
-\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x0a\0\0\0\0\0\0\0\0\0\0\x02\x0a\0\0\0\0\0\0\0\
-\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x01\0\0\0\0\0\0\0\x04\0\0\x04\x20\0\0\0\
-\x19\0\0\0\x01\0\0\0\0\0\0\0\x1e\0\0\0\x05\0\0\0\x40\0\0\0\x27\0\0\0\x07\0\0\0\
-\x80\0\0\0\x32\0\0\0\x09\0\0\0\xc0\0\0\0\x3e\0\0\0\0\0\0\x0e\x0b\0\0\0\x01\0\0\
-\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\
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-\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xc2\0\0\0\x01\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x88\x14\0\0\0\0\0\0\x8d\x16\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xbe\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\x70\x3d\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\x0c\0\0\0\x07\0\0\0\x08\
-\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x24\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\x18\x2b\0\0\0\0\0\0\xa0\x0c\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\x20\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb0\
-\x3d\0\0\0\0\0\0\x70\x0c\0\0\0\0\0\0\x0c\0\0\0\x09\0\0\0\x08\0\0\0\0\0\0\0\x10\
-\0\0\0\0\0\0\0\x79\0\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\x20\
-\x4a\0\0\0\0\0\0\x05\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\xb6\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb8\x37\0\0\0\0\0\0\
-\x88\x05\0\0\0\0\0\0\x01\0\0\0\x36\0\0\0\x08\0\0\0\0\0\0\0\x18\0\0\0\0\0\0\0";
+\0\xa4\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x55\x4b\0\0\0\0\0\0\x5b\
+\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x1a\0\0\0\
+\x01\0\0\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x31\0\0\0\x01\0\0\0\x06\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\xc8\x13\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x2d\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\xc0\x3d\0\0\0\0\0\0\x30\0\0\0\0\0\0\0\x0c\0\0\0\x03\0\0\0\x08\0\0\
+\0\0\0\0\0\x10\0\0\0\0\0\0\0\x38\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\x08\x14\0\0\0\0\0\0\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\x7e\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x68\x14\0\
+\0\0\0\0\0\x07\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\xb8\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x70\x14\0\0\0\0\0\0\x89\
+\x16\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb4\0\0\0\
+\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xf0\x3d\0\0\0\0\0\0\x40\0\0\0\0\0\
+\0\0\x0c\0\0\0\x07\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x24\0\0\0\x01\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xfc\x2a\0\0\0\0\0\0\x50\x0d\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x20\0\0\0\x09\0\0\0\x40\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x30\x3e\0\0\0\0\0\0\x20\x0d\0\0\0\0\0\0\x0c\0\0\0\x09\0\
+\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x6f\0\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\
+\0\0\0\0\0\0\0\0\0\0\0\x50\x4b\0\0\0\0\0\0\x05\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xac\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\x50\x38\0\0\0\0\0\0\x70\x05\0\0\0\0\0\0\x01\0\0\0\x35\0\0\0\x08\0\0\0\
+\0\0\0\0\x18\0\0\0\0\0\0\0";
}
#ifdef __cplusplus
diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
index 20f227e2acc..d32b6fb42a4 100644
--- a/tools/ebpf/rss.bpf.c
+++ b/tools/ebpf/rss.bpf.c
@@ -528,7 +528,7 @@ static inline __u32 calculate_rss_hash(struct __sk_buff *skb,
return result;
}
-SEC("tun_rss_steering")
+SEC("socket")
int tun_rss_steering_prog(struct __sk_buff *skb)
{
--
2.39.1
^ permalink raw reply related [flat|nested] 14+ messages in thread
* Re: [PATCH 0/5] eBPF RSS through QMP support.
2023-05-01 7:20 [PATCH 0/5] eBPF RSS through QMP support Andrew Melnychenko
` (4 preceding siblings ...)
2023-05-01 7:21 ` [PATCH 5/5] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
@ 2023-05-03 8:22 ` Daniel P. Berrangé
2023-05-07 21:34 ` Andrew Melnichenko
5 siblings, 1 reply; 14+ messages in thread
From: Daniel P. Berrangé @ 2023-05-03 8:22 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Mon, May 01, 2023 at 10:20:56AM +0300, Andrew Melnychenko 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.
>
> Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
Is that complete enough to be running guests ? If so, have you
successfully tested with a QEMU running under qemu:///system
as the qemu:qemu user, to prove it works without any extra
capabilities being needed ?
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] 14+ messages in thread
* Re: [PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds.
2023-05-01 7:20 ` [PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
@ 2023-05-03 11:03 ` Daniel P. Berrangé
2023-05-07 21:35 ` Andrew Melnichenko
0 siblings, 1 reply; 14+ messages in thread
From: Daniel P. Berrangé @ 2023-05-03 11:03 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Mon, May 01, 2023 at 10:20:58AM +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 | 96 +++++++++++++++++++++++++++++++---
> include/hw/virtio/virtio-net.h | 1 +
> 2 files changed, 91 insertions(+), 6 deletions(-)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 53e1c326433..9b3a997d872 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 +1306,96 @@ 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,
> + Error **errp)
> {
> - if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> - /* backend does't support steering ebpf */
> - return false;
> + 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;
> + }
> + }
> +
> + if (cur != NULL) {
> + /* the string contains more arguments */
> + error_setg(errp,
> + "Too many eBPF file descriptors for RSS provided.");
> + } else if (i < nfds) {
> + error_setg(errp,
> + "Not enough eBPF file descriptors for RSS were provided.");
> + }
> +
> + return i;
> +}
This whole method could be replaced by a call to g_strsplit in
the caller....
> +
> +static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
> +{
> + char *fds_strs[EBPF_RSS_MAX_FDS];
g_autoptr(GStrv) fds_strs = g_strsplit(n->ebpf_rss_fds, ",", 0);
> + int fds[EBPF_RSS_MAX_FDS];
Left as uninitialized stack memory.
> + int nfds;
> + int ret = true;
> + int i = 0;
> +
> + ERRP_GUARD();
> +
> + nfds = virtio_net_get_ebpf_rss_fds(n->ebpf_rss_fds,
> + fds_strs, EBPF_RSS_MAX_FDS, errp);
> + if (*errp) {
> + ret = false;
> + goto exit;
> }
Replace with
if (g_strv_length(fds_strs) != EBPF_RSS_MAX_FDS) {
error_setg(errp,
"Expected %d file descriptors but got %d",
EBPF_RSS_MAX_FDS, g_strv_length(fds_strs));
return false;
}
>
> - return ebpf_rss_load(&n->ebpf_rss);
> + for (i = 0; i < nfds; i++) {
> + fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], errp);
> + if (*errp) {
> + ret = false;
> + goto exit;
This can break out of the loop before all elements in 'fds' are
initialized.
> + }
> + }
> +
> + ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
> +
> +exit:
> + if (!ret || *errp) {
> + for (i = 0; i < nfds; i++) {
> + close(fds[i]);
> + }
> + }
This now calls close() on uninitialized memory, killing
arbitary FDs QEMU has open elsewhere.
> +
> + for (i = 0; i < nfds; i++) {
> + g_free(fds_strs[i]);
> + }
Not required if we use g_autoptr(GStrv)
> +
> + return ret;
> +}
> +
> +static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
> +{
> + bool ret = false;
> +
> + if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> + if (!(n->ebpf_rss_fds
> + && virtio_net_load_ebpf_fds(n, errp))) {
> + ret = ebpf_rss_load(&n->ebpf_rss);
> + }
> + }
> +
> + return ret;
> }
>
> static void virtio_net_unload_ebpf(VirtIONet *n)
> @@ -3738,7 +3821,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
> net_rx_pkt_init(&n->rx_pkt);
>
> if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
> - virtio_net_load_ebpf(n);
> + virtio_net_load_ebpf(n, errp);
> }
> }
>
> @@ -3900,6 +3983,7 @@ static Property virtio_net_properties[] = {
> VIRTIO_NET_F_RSS, false),
> DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
> VIRTIO_NET_F_HASH_REPORT, false),
> + DEFINE_PROP_STRING("ebpf_rss_fds", VirtIONet, ebpf_rss_fds),
> DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
> VIRTIO_NET_F_RSC_EXT, false),
> DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
> diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
> index ef234ffe7ef..e10ce88f918 100644
> --- a/include/hw/virtio/virtio-net.h
> +++ b/include/hw/virtio/virtio-net.h
> @@ -219,6 +219,7 @@ struct VirtIONet {
> VirtioNetRssData rss_data;
> struct NetRxPkt *rx_pkt;
> struct EBPFRSSContext ebpf_rss;
> + char *ebpf_rss_fds;
> };
>
> size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
> --
> 2.39.1
>
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update.
2023-05-01 7:20 ` [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
@ 2023-05-03 11:07 ` Daniel P. Berrangé
2023-05-07 21:39 ` Andrew Melnichenko
0 siblings, 1 reply; 14+ messages in thread
From: Daniel P. Berrangé @ 2023-05-03 11:07 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Mon, May 01, 2023 at 10:20:57AM +0300, Andrew Melnychenko wrote:
> Changed eBPF map updates through mmaped array.
> Mmaped arrays provide direct access to map data.
> It should omit using bpf_map_update_elem() call,
> which may require capabilities that are not present.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> ebpf/ebpf_rss-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 e71e229190d..8d7fae2ad92 100644
> --- a/ebpf/ebpf_rss-stub.c
> +++ b/ebpf/ebpf_rss-stub.c
> @@ -28,6 +28,12 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
> return false;
> }
>
> +bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
> + int config_fd, int toeplitz_fd, int table_fd)
> +{
> + return false;
> +}
> +
> bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
> uint16_t *indirections_table, uint8_t *toeplitz_key)
> {
> diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
> index cee658c158b..08015fecb18 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);
These 4 fds are left uninitialized with 'ctx' is first allocated,
so will either default to 0 (aka stdin's FD num), or worse,
default to uninitialized memory.
Correct sequencing of the API calls will probably operate safely
afaict, but I'd prefer us to proactively initialize all these
to '-1' in ebpf_rss_init(), and check there that they're not
'-1' before trying to close them, and then set them to -1 once
closed.
> + }
> +
> ctx->obj = NULL;
> + ctx->program_fd = -1;
> }
> diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
> index bf3f2572c7c..239242b0d26 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);
I'd probably suggest splitting this into two patches.
One that introduces the mmap'ing to replace bpf_map_update_elem,
and then a second that adds ebpf_rss_load_fds, as the ebpf_rss_load_fds
addition is making the diff output harder to read than it needs to be.
> +
> bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
> uint16_t *indirections_table, uint8_t *toeplitz_key);
>
> --
> 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] 14+ messages in thread
* Re: [PATCH 4/5] qmp: Added new command to retrieve eBPF blob.
2023-05-01 7:21 ` [PATCH 4/5] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
@ 2023-05-03 11:09 ` Daniel P. Berrangé
2023-05-07 22:05 ` Andrew Melnichenko
0 siblings, 1 reply; 14+ messages in thread
From: Daniel P. Berrangé @ 2023-05-03 11:09 UTC (permalink / raw)
To: Andrew Melnychenko
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
On Mon, May 01, 2023 at 10:21:00AM +0300, Andrew Melnychenko wrote:
> Added command "request-ebpf". This command returns
> eBPF program encoded base64. The program taken from the
> skeleton and essentially is an ELF object that can be
> loaded in the future with libbpf.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
> monitor/qmp-cmds.c | 16 ++++++++++++++++
> qapi/misc.json | 28 ++++++++++++++++++++++++++++
> 2 files changed, 44 insertions(+)
>
> diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> index b0f948d3376..f7641bb55b9 100644
> --- a/monitor/qmp-cmds.c
> +++ b/monitor/qmp-cmds.c
> @@ -32,6 +32,7 @@
> #include "hw/mem/memory-device.h"
> #include "hw/intc/intc.h"
> #include "hw/rdma/rdma.h"
> +#include "ebpf/ebpf.h"
>
> NameInfo *qmp_query_name(Error **errp)
> {
> @@ -209,3 +210,18 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
> qmp_marshal_qmp_capabilities,
> QCO_ALLOW_PRECONFIG, 0);
> }
> +
> +EbpfObject *qmp_request_ebpf(const char *id, Error **errp)
> +{
> + EbpfObject *ret = NULL;
> + size_t size = 0;
> + const void *data = ebpf_find_binary_by_id(id, &size, errp);
> + if (!data) {
> + return NULL;
> + }
> +
> + ret = g_new0(EbpfObject, 1);
> + ret->object = g_base64_encode(data, size);
> +
> + return ret;
> +}
> diff --git a/qapi/misc.json b/qapi/misc.json
> index 6ddd16ea283..81613fd1b13 100644
> --- a/qapi/misc.json
> +++ b/qapi/misc.json
> @@ -618,3 +618,31 @@
> { 'event': 'VFU_CLIENT_HANGUP',
> 'data': { 'vfu-id': 'str', 'vfu-qom-path': 'str',
> 'dev-id': 'str', 'dev-qom-path': 'str' } }
> +
> +##
> +# @EbpfObject:
> +#
> +# Structure that holds eBPF ELF object encoded in base64.
> +#
> +# Since: 8.1
> +#
> +##
> +{ 'struct': 'EbpfObject',
> + 'data': {'object': 'str'} }
> +
> +##
> +# @request-ebpf:
> +#
> +# Function returns eBPF object that can be loaded with libbpf.
> +# Management applications (g.e. libvirt) may load it and pass file
> +# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
> +#
> +# Returns: RSS eBPF object encoded in base64.
> +#
> +# Since: 8.1
> +#
> +##
> +{ 'command': 'request-ebpf',
> + 'data': { 'id': 'str' },
Since the number of EBPF program IDs is finite and known at build
time, I think we'd be better using an enum instead of str. That
will let apps introspect the QAPI schema to query whether the
particular EBPF program ID is known to this version fo QEMU.
> + 'returns': 'EbpfObject' }
> +
> --
> 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] 14+ messages in thread
* Re: [PATCH 0/5] eBPF RSS through QMP support.
2023-05-03 8:22 ` [PATCH 0/5] eBPF RSS through QMP support Daniel P. Berrangé
@ 2023-05-07 21:34 ` Andrew Melnichenko
0 siblings, 0 replies; 14+ messages in thread
From: Andrew Melnichenko @ 2023-05-07 21:34 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
Hi all,
On Wed, May 3, 2023 at 11:22 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Mon, May 01, 2023 at 10:20:56AM +0300, Andrew Melnychenko 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.
> >
> > Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
>
> Is that complete enough to be running guests ? If so, have you
> successfully tested with a QEMU running under qemu:///system
> as the qemu:qemu user, to prove it works without any extra
> capabilities being needed ?
Yeah, but still working on it. Overall, QEMU doesn't require
additional capabilities.
Map update through mmap doesn't require any.
Tested with qemu://system.
There is still an issue with cache for libvirt.
>
> 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] 14+ messages in thread
* Re: [PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds.
2023-05-03 11:03 ` Daniel P. Berrangé
@ 2023-05-07 21:35 ` Andrew Melnichenko
0 siblings, 0 replies; 14+ messages in thread
From: Andrew Melnichenko @ 2023-05-07 21:35 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
Hi all,
Thank you for your comments. I'll update it in the next patch version.
On Wed, May 3, 2023 at 2:03 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Mon, May 01, 2023 at 10:20:58AM +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 | 96 +++++++++++++++++++++++++++++++---
> > include/hw/virtio/virtio-net.h | 1 +
> > 2 files changed, 91 insertions(+), 6 deletions(-)
> >
> > diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> > index 53e1c326433..9b3a997d872 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 +1306,96 @@ 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,
> > + Error **errp)
> > {
> > - if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> > - /* backend does't support steering ebpf */
> > - return false;
> > + 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;
> > + }
> > + }
> > +
> > + if (cur != NULL) {
> > + /* the string contains more arguments */
> > + error_setg(errp,
> > + "Too many eBPF file descriptors for RSS provided.");
> > + } else if (i < nfds) {
> > + error_setg(errp,
> > + "Not enough eBPF file descriptors for RSS were provided.");
> > + }
> > +
> > + return i;
> > +}
>
> This whole method could be replaced by a call to g_strsplit in
> the caller....
>
>
> > +
> > +static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
> > +{
> > + char *fds_strs[EBPF_RSS_MAX_FDS];
>
> g_autoptr(GStrv) fds_strs = g_strsplit(n->ebpf_rss_fds, ",", 0);
>
> > + int fds[EBPF_RSS_MAX_FDS];
>
> Left as uninitialized stack memory.
>
> > + int nfds;
> > + int ret = true;
> > + int i = 0;
> > +
> > + ERRP_GUARD();
> > +
> > + nfds = virtio_net_get_ebpf_rss_fds(n->ebpf_rss_fds,
> > + fds_strs, EBPF_RSS_MAX_FDS, errp);
> > + if (*errp) {
> > + ret = false;
> > + goto exit;
> > }
>
> Replace with
>
> if (g_strv_length(fds_strs) != EBPF_RSS_MAX_FDS) {
> error_setg(errp,
> "Expected %d file descriptors but got %d",
> EBPF_RSS_MAX_FDS, g_strv_length(fds_strs));
> return false;
> }
>
> >
> > - return ebpf_rss_load(&n->ebpf_rss);
> > + for (i = 0; i < nfds; i++) {
> > + fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], errp);
> > + if (*errp) {
> > + ret = false;
> > + goto exit;
>
> This can break out of the loop before all elements in 'fds' are
> initialized.
>
> > + }
> > + }
> > +
> > + ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
> > +
> > +exit:
> > + if (!ret || *errp) {
> > + for (i = 0; i < nfds; i++) {
> > + close(fds[i]);
> > + }
> > + }
>
> This now calls close() on uninitialized memory, killing
> arbitary FDs QEMU has open elsewhere.
>
> > +
> > + for (i = 0; i < nfds; i++) {
> > + g_free(fds_strs[i]);
> > + }
>
> Not required if we use g_autoptr(GStrv)
>
> > +
> > + return ret;
> > +}
> > +
> > +static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
> > +{
> > + bool ret = false;
> > +
> > + if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> > + if (!(n->ebpf_rss_fds
> > + && virtio_net_load_ebpf_fds(n, errp))) {
> > + ret = ebpf_rss_load(&n->ebpf_rss);
> > + }
> > + }
> > +
> > + return ret;
> > }
> >
> > static void virtio_net_unload_ebpf(VirtIONet *n)
> > @@ -3738,7 +3821,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
> > net_rx_pkt_init(&n->rx_pkt);
> >
> > if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
> > - virtio_net_load_ebpf(n);
> > + virtio_net_load_ebpf(n, errp);
> > }
> > }
> >
> > @@ -3900,6 +3983,7 @@ static Property virtio_net_properties[] = {
> > VIRTIO_NET_F_RSS, false),
> > DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
> > VIRTIO_NET_F_HASH_REPORT, false),
> > + DEFINE_PROP_STRING("ebpf_rss_fds", VirtIONet, ebpf_rss_fds),
> > DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
> > VIRTIO_NET_F_RSC_EXT, false),
> > DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
> > diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
> > index ef234ffe7ef..e10ce88f918 100644
> > --- a/include/hw/virtio/virtio-net.h
> > +++ b/include/hw/virtio/virtio-net.h
> > @@ -219,6 +219,7 @@ struct VirtIONet {
> > VirtioNetRssData rss_data;
> > struct NetRxPkt *rx_pkt;
> > struct EBPFRSSContext ebpf_rss;
> > + char *ebpf_rss_fds;
> > };
> >
> > size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
> > --
> > 2.39.1
> >
>
> With regards,
> Daniel
> --
> |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
> |: https://libvirt.org -o- https://fstop138.berrange.com :|
> |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
>
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update.
2023-05-03 11:07 ` Daniel P. Berrangé
@ 2023-05-07 21:39 ` Andrew Melnichenko
0 siblings, 0 replies; 14+ messages in thread
From: Andrew Melnichenko @ 2023-05-07 21:39 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
Hi all,
On Wed, May 3, 2023 at 2:07 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Mon, May 01, 2023 at 10:20:57AM +0300, Andrew Melnychenko wrote:
> > Changed eBPF map updates through mmaped array.
> > Mmaped arrays provide direct access to map data.
> > It should omit using bpf_map_update_elem() call,
> > which may require capabilities that are not present.
> >
> > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> > ---
> > ebpf/ebpf_rss-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 e71e229190d..8d7fae2ad92 100644
> > --- a/ebpf/ebpf_rss-stub.c
> > +++ b/ebpf/ebpf_rss-stub.c
> > @@ -28,6 +28,12 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
> > return false;
> > }
> >
> > +bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
> > + int config_fd, int toeplitz_fd, int table_fd)
> > +{
> > + return false;
> > +}
> > +
> > bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
> > uint16_t *indirections_table, uint8_t *toeplitz_key)
> > {
> > diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
> > index cee658c158b..08015fecb18 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);
>
> These 4 fds are left uninitialized with 'ctx' is first allocated,
> so will either default to 0 (aka stdin's FD num), or worse,
> default to uninitialized memory.
>
> Correct sequencing of the API calls will probably operate safely
> afaict, but I'd prefer us to proactively initialize all these
> to '-1' in ebpf_rss_init(), and check there that they're not
> '-1' before trying to close them, and then set them to -1 once
> closed.
>
Oh yeah, I've missed it, I'll fix it, there is supposed to be a check
for opened context.
> > + }
> > +
> > ctx->obj = NULL;
> > + ctx->program_fd = -1;
> > }
> > diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
> > index bf3f2572c7c..239242b0d26 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);
>
> I'd probably suggest splitting this into two patches.
>
> One that introduces the mmap'ing to replace bpf_map_update_elem,
> and then a second that adds ebpf_rss_load_fds, as the ebpf_rss_load_fds
> addition is making the diff output harder to read than it needs to be.
>
Ok.
> > +
> > bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
> > uint16_t *indirections_table, uint8_t *toeplitz_key);
> >
> > --
> > 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] 14+ messages in thread
* Re: [PATCH 4/5] qmp: Added new command to retrieve eBPF blob.
2023-05-03 11:09 ` Daniel P. Berrangé
@ 2023-05-07 22:05 ` Andrew Melnichenko
0 siblings, 0 replies; 14+ messages in thread
From: Andrew Melnichenko @ 2023-05-07 22:05 UTC (permalink / raw)
To: Daniel P. Berrangé
Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan
Hi all,
On Wed, May 3, 2023 at 2:09 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Mon, May 01, 2023 at 10:21:00AM +0300, Andrew Melnychenko wrote:
> > Added command "request-ebpf". This command returns
> > eBPF program encoded base64. The program taken from the
> > skeleton and essentially is an ELF object that can be
> > loaded in the future with libbpf.
> >
> > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> > ---
> > monitor/qmp-cmds.c | 16 ++++++++++++++++
> > qapi/misc.json | 28 ++++++++++++++++++++++++++++
> > 2 files changed, 44 insertions(+)
> >
> > diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> > index b0f948d3376..f7641bb55b9 100644
> > --- a/monitor/qmp-cmds.c
> > +++ b/monitor/qmp-cmds.c
> > @@ -32,6 +32,7 @@
> > #include "hw/mem/memory-device.h"
> > #include "hw/intc/intc.h"
> > #include "hw/rdma/rdma.h"
> > +#include "ebpf/ebpf.h"
> >
> > NameInfo *qmp_query_name(Error **errp)
> > {
> > @@ -209,3 +210,18 @@ static void __attribute__((__constructor__)) monitor_init_qmp_commands(void)
> > qmp_marshal_qmp_capabilities,
> > QCO_ALLOW_PRECONFIG, 0);
> > }
> > +
> > +EbpfObject *qmp_request_ebpf(const char *id, Error **errp)
> > +{
> > + EbpfObject *ret = NULL;
> > + size_t size = 0;
> > + const void *data = ebpf_find_binary_by_id(id, &size, errp);
> > + if (!data) {
> > + return NULL;
> > + }
> > +
> > + ret = g_new0(EbpfObject, 1);
> > + ret->object = g_base64_encode(data, size);
> > +
> > + return ret;
> > +}
> > diff --git a/qapi/misc.json b/qapi/misc.json
> > index 6ddd16ea283..81613fd1b13 100644
> > --- a/qapi/misc.json
> > +++ b/qapi/misc.json
> > @@ -618,3 +618,31 @@
> > { 'event': 'VFU_CLIENT_HANGUP',
> > 'data': { 'vfu-id': 'str', 'vfu-qom-path': 'str',
> > 'dev-id': 'str', 'dev-qom-path': 'str' } }
> > +
> > +##
> > +# @EbpfObject:
> > +#
> > +# Structure that holds eBPF ELF object encoded in base64.
> > +#
> > +# Since: 8.1
> > +#
> > +##
> > +{ 'struct': 'EbpfObject',
> > + 'data': {'object': 'str'} }
> > +
> > +##
> > +# @request-ebpf:
> > +#
> > +# Function returns eBPF object that can be loaded with libbpf.
> > +# Management applications (g.e. libvirt) may load it and pass file
> > +# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
> > +#
> > +# Returns: RSS eBPF object encoded in base64.
> > +#
> > +# Since: 8.1
> > +#
> > +##
> > +{ 'command': 'request-ebpf',
> > + 'data': { 'id': 'str' },
>
> Since the number of EBPF program IDs is finite and known at build
> time, I think we'd be better using an enum instead of str. That
> will let apps introspect the QAPI schema to query whether the
> particular EBPF program ID is known to this version fo QEMU.
>
I've researched that issue a bit. I'll add the qapi enum.
> > + 'returns': 'EbpfObject' }
> > +
> > --
> > 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] 14+ messages in thread
end of thread, other threads:[~2023-05-07 22:24 UTC | newest]
Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-05-01 7:20 [PATCH 0/5] eBPF RSS through QMP support Andrew Melnychenko
2023-05-01 7:20 ` [PATCH 1/5] ebpf: Added eBPF initialization by fds and map update Andrew Melnychenko
2023-05-03 11:07 ` Daniel P. Berrangé
2023-05-07 21:39 ` Andrew Melnichenko
2023-05-01 7:20 ` [PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
2023-05-03 11:03 ` Daniel P. Berrangé
2023-05-07 21:35 ` Andrew Melnichenko
2023-05-01 7:20 ` [PATCH 3/5] ebpf: Added declaration/initialization routines Andrew Melnychenko
2023-05-01 7:21 ` [PATCH 4/5] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
2023-05-03 11:09 ` Daniel P. Berrangé
2023-05-07 22:05 ` Andrew Melnichenko
2023-05-01 7:21 ` [PATCH 5/5] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
2023-05-03 8:22 ` [PATCH 0/5] eBPF RSS through QMP support Daniel P. Berrangé
2023-05-07 21:34 ` Andrew Melnichenko
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