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-rw-r--r--MAINTAINERS8
-rwxr-xr-xconfigure8
-rw-r--r--docs/devel/ebpf_rss.rst125
-rw-r--r--docs/devel/index.rst1
-rw-r--r--ebpf/ebpf_rss-stub.c40
-rw-r--r--ebpf/ebpf_rss.c165
-rw-r--r--ebpf/ebpf_rss.h44
-rw-r--r--ebpf/meson.build1
-rw-r--r--ebpf/rss.bpf.skeleton.h431
-rw-r--r--ebpf/trace-events4
-rw-r--r--ebpf/trace.h1
-rw-r--r--hw/net/vhost_net.c3
-rw-r--r--hw/net/virtio-net.c116
-rw-r--r--include/hw/virtio/virtio-net.h4
-rw-r--r--include/net/net.h2
-rw-r--r--meson.build23
-rw-r--r--meson_options.txt2
-rw-r--r--net/tap-bsd.c5
-rw-r--r--net/tap-linux.c13
-rw-r--r--net/tap-linux.h1
-rw-r--r--net/tap-solaris.c5
-rw-r--r--net/tap-stub.c5
-rw-r--r--net/tap.c9
-rw-r--r--net/tap_int.h1
-rw-r--r--net/vhost-vdpa.c2
-rwxr-xr-xtools/ebpf/Makefile.ebpf21
-rw-r--r--tools/ebpf/rss.bpf.c571
27 files changed, 1607 insertions, 4 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index de5426f672..7d9cd29042 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3316,6 +3316,14 @@ F: include/hw/remote/proxy-memory-listener.h
F: hw/remote/iohub.c
F: include/hw/remote/iohub.h
+EBPF:
+M: Jason Wang <jasowang@redhat.com>
+R: Andrew Melnychenko <andrew@daynix.com>
+R: Yuri Benditovich <yuri.benditovich@daynix.com>
+S: Maintained
+F: ebpf/*
+F: tools/ebpf/*
+
Build and test automation
-------------------------
Build and test automation, general continuous integration
diff --git a/configure b/configure
index f0c8629dc6..8dcb9965b2 100755
--- a/configure
+++ b/configure
@@ -328,6 +328,7 @@ vhost_vsock="$default_feature"
vhost_user="no"
vhost_user_blk_server="auto"
vhost_user_fs="$default_feature"
+bpf="auto"
kvm="auto"
hax="auto"
hvf="auto"
@@ -1219,6 +1220,10 @@ for opt do
;;
--enable-membarrier) membarrier="yes"
;;
+ --disable-bpf) bpf="disabled"
+ ;;
+ --enable-bpf) bpf="enabled"
+ ;;
--disable-blobs) blobs="false"
;;
--with-pkgversion=*) pkgversion="$optarg"
@@ -1879,6 +1884,7 @@ disabled with --disable-FEATURE, default is enabled if available
vhost-user vhost-user backend support
vhost-user-blk-server vhost-user-blk server support
vhost-vdpa vhost-vdpa kernel backend support
+ bpf BPF kernel support
spice spice
spice-protocol spice-protocol
rbd rados block device (rbd)
@@ -6440,7 +6446,7 @@ if test "$skip_meson" = no; then
-Dattr=$attr -Ddefault_devices=$default_devices \
-Ddocs=$docs -Dsphinx_build=$sphinx_build -Dinstall_blobs=$blobs \
-Dvhost_user_blk_server=$vhost_user_blk_server -Dmultiprocess=$multiprocess \
- -Dfuse=$fuse -Dfuse_lseek=$fuse_lseek -Dguest_agent_msi=$guest_agent_msi \
+ -Dfuse=$fuse -Dfuse_lseek=$fuse_lseek -Dguest_agent_msi=$guest_agent_msi -Dbpf=$bpf\
$(if test "$default_features" = no; then echo "-Dauto_features=disabled"; fi) \
-Dtcg_interpreter=$tcg_interpreter \
$cross_arg \
diff --git a/docs/devel/ebpf_rss.rst b/docs/devel/ebpf_rss.rst
new file mode 100644
index 0000000000..e00962577a
--- /dev/null
+++ b/docs/devel/ebpf_rss.rst
@@ -0,0 +1,125 @@
+===========================
+eBPF RSS virtio-net support
+===========================
+
+RSS(Receive Side Scaling) is used to distribute network packets to guest virtqueues
+by calculating packet hash. Usually every queue is processed then by a specific guest CPU core.
+
+For now there are 2 RSS implementations in qemu:
+- 'in-qemu' RSS (functions if qemu receives network packets, i.e. vhost=off)
+- eBPF RSS (can function with also with vhost=on)
+
+eBPF support (CONFIG_EBPF) is enabled by 'configure' script.
+To enable eBPF RSS support use './configure --enable-bpf'.
+
+If steering BPF is not set for kernel's TUN module, the TUN uses automatic selection
+of rx virtqueue based on lookup table built according to calculated symmetric hash
+of transmitted packets.
+If steering BPF is set for TUN the BPF code calculates the hash of packet header and
+returns the virtqueue number to place the packet to.
+
+Simplified decision formula:
+
+.. code:: C
+
+ queue_index = indirection_table[hash(<packet data>)%<indirection_table size>]
+
+
+Not for all packets, the hash can/should be calculated.
+
+Note: currently, eBPF RSS does not support hash reporting.
+
+eBPF RSS turned on by different combinations of vhost-net, vitrio-net and tap configurations:
+
+- eBPF is used:
+
+ tap,vhost=off & virtio-net-pci,rss=on,hash=off
+
+- eBPF is used:
+
+ tap,vhost=on & virtio-net-pci,rss=on,hash=off
+
+- 'in-qemu' RSS is used:
+
+ tap,vhost=off & virtio-net-pci,rss=on,hash=on
+
+- eBPF is used, hash population feature is not reported to the guest:
+
+ tap,vhost=on & virtio-net-pci,rss=on,hash=on
+
+If CONFIG_EBPF is not set then only 'in-qemu' RSS is supported.
+Also 'in-qemu' RSS, as a fallback, is used if the eBPF program failed to load or set to TUN.
+
+RSS eBPF program
+----------------
+
+RSS program located in ebpf/rss.bpf.skeleton.h generated by bpftool.
+So the program is part of the qemu binary.
+Initially, the eBPF program was compiled by clang and source code located at tools/ebpf/rss.bpf.c.
+Prerequisites to recompile the eBPF program (regenerate ebpf/rss.bpf.skeleton.h):
+
+ llvm, clang, kernel source tree, bpftool
+ Adjust Makefile.ebpf to reflect the location of the kernel source tree
+
+ $ cd tools/ebpf
+ $ make -f Makefile.ebpf
+
+Current eBPF RSS implementation uses 'bounded loops' with 'backward jump instructions' which present in the last kernels.
+Overall eBPF RSS works on kernels 5.8+.
+
+eBPF RSS implementation
+-----------------------
+
+eBPF RSS loading functionality located in ebpf/ebpf_rss.c and ebpf/ebpf_rss.h.
+
+The `struct EBPFRSSContext` structure that holds 4 file descriptors:
+
+- ctx - pointer of the libbpf context.
+- program_fd - file descriptor of the eBPF RSS program.
+- map_configuration - file descriptor of the 'configuration' map. This map contains one element of 'struct EBPFRSSConfig'. This configuration determines eBPF program behavior.
+- map_toeplitz_key - file descriptor of the 'Toeplitz key' map. One element of the 40byte key prepared for the hashing algorithm.
+- map_indirections_table - 128 elements of queue indexes.
+
+`struct EBPFRSSConfig` fields:
+
+- redirect - "boolean" value, should the hash be calculated, on false - `default_queue` would be used as the final decision.
+- populate_hash - for now, not used. eBPF RSS doesn't support hash reporting.
+- hash_types - binary mask of different hash types. See `VIRTIO_NET_RSS_HASH_TYPE_*` defines. If for packet hash should not be calculated - `default_queue` would be used.
+- indirections_len - length of the indirections table, maximum 128.
+- default_queue - the queue index that used for packet that shouldn't be hashed. For some packets, the hash can't be calculated(g.e ARP).
+
+Functions:
+
+- `ebpf_rss_init()` - sets ctx to NULL, which indicates that EBPFRSSContext is not loaded.
+- `ebpf_rss_load()` - creates 3 maps and loads eBPF program from the rss.bpf.skeleton.h. Returns 'true' on success. After that, program_fd can be used to set steering for TAP.
+- `ebpf_rss_set_all()` - sets values for eBPF maps. `indirections_table` length is in EBPFRSSConfig. `toeplitz_key` is VIRTIO_NET_RSS_MAX_KEY_SIZE aka 40 bytes array.
+- `ebpf_rss_unload()` - close all file descriptors and set ctx to NULL.
+
+Simplified eBPF RSS workflow:
+
+.. code:: C
+
+ struct EBPFRSSConfig config;
+ config.redirect = 1;
+ config.hash_types = VIRTIO_NET_RSS_HASH_TYPE_UDPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4;
+ config.indirections_len = VIRTIO_NET_RSS_MAX_TABLE_LEN;
+ config.default_queue = 0;
+
+ uint16_t table[VIRTIO_NET_RSS_MAX_TABLE_LEN] = {...};
+ uint8_t key[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {...};
+
+ struct EBPFRSSContext ctx;
+ ebpf_rss_init(&ctx);
+ ebpf_rss_load(&ctx);
+ ebpf_rss_set_all(&ctx, &config, table, key);
+ if (net_client->info->set_steering_ebpf != NULL) {
+ net_client->info->set_steering_ebpf(net_client, ctx->program_fd);
+ }
+ ...
+ ebpf_unload(&ctx);
+
+
+NetClientState SetSteeringEBPF()
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+For now, `set_steering_ebpf()` method supported by Linux TAP NetClientState. The method requires an eBPF program file descriptor as an argument.
diff --git a/docs/devel/index.rst b/docs/devel/index.rst
index cbdbb90491..791925dcda 100644
--- a/docs/devel/index.rst
+++ b/docs/devel/index.rst
@@ -43,3 +43,4 @@ Contents:
qom
block-coroutine-wrapper
multi-process
+ ebpf_rss
diff --git a/ebpf/ebpf_rss-stub.c b/ebpf/ebpf_rss-stub.c
new file mode 100644
index 0000000000..e71e229190
--- /dev/null
+++ b/ebpf/ebpf_rss-stub.c
@@ -0,0 +1,40 @@
+/*
+ * eBPF RSS stub file
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Yuri Benditovich <yuri.benditovich@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "ebpf/ebpf_rss.h"
+
+void ebpf_rss_init(struct EBPFRSSContext *ctx)
+{
+
+}
+
+bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx)
+{
+ return false;
+}
+
+bool ebpf_rss_load(struct EBPFRSSContext *ctx)
+{
+ return false;
+}
+
+bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
+ uint16_t *indirections_table, uint8_t *toeplitz_key)
+{
+ return false;
+}
+
+void ebpf_rss_unload(struct EBPFRSSContext *ctx)
+{
+
+}
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
new file mode 100644
index 0000000000..118c68da83
--- /dev/null
+++ b/ebpf/ebpf_rss.c
@@ -0,0 +1,165 @@
+/*
+ * eBPF RSS loader
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ * Yuri Benditovich <yuri.benditovich@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+
+#include <bpf/libbpf.h>
+#include <bpf/bpf.h>
+
+#include "hw/virtio/virtio-net.h" /* VIRTIO_NET_RSS_MAX_TABLE_LEN */
+
+#include "ebpf/ebpf_rss.h"
+#include "ebpf/rss.bpf.skeleton.h"
+#include "trace.h"
+
+void ebpf_rss_init(struct EBPFRSSContext *ctx)
+{
+ if (ctx != NULL) {
+ ctx->obj = NULL;
+ }
+}
+
+bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx)
+{
+ return ctx != NULL && ctx->obj != NULL;
+}
+
+bool ebpf_rss_load(struct EBPFRSSContext *ctx)
+{
+ struct rss_bpf *rss_bpf_ctx;
+
+ if (ctx == NULL) {
+ return false;
+ }
+
+ rss_bpf_ctx = rss_bpf__open();
+ if (rss_bpf_ctx == NULL) {
+ trace_ebpf_error("eBPF RSS", "can not open eBPF RSS object");
+ goto error;
+ }
+
+ bpf_program__set_socket_filter(rss_bpf_ctx->progs.tun_rss_steering_prog);
+
+ if (rss_bpf__load(rss_bpf_ctx)) {
+ trace_ebpf_error("eBPF RSS", "can not load RSS program");
+ goto error;
+ }
+
+ ctx->obj = rss_bpf_ctx;
+ ctx->program_fd = bpf_program__fd(
+ rss_bpf_ctx->progs.tun_rss_steering_prog);
+ ctx->map_configuration = bpf_map__fd(
+ rss_bpf_ctx->maps.tap_rss_map_configurations);
+ ctx->map_indirections_table = bpf_map__fd(
+ rss_bpf_ctx->maps.tap_rss_map_indirection_table);
+ ctx->map_toeplitz_key = bpf_map__fd(
+ rss_bpf_ctx->maps.tap_rss_map_toeplitz_key);
+
+ return true;
+error:
+ rss_bpf__destroy(rss_bpf_ctx);
+ ctx->obj = NULL;
+
+ return false;
+}
+
+static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
+ struct EBPFRSSConfig *config)
+{
+ uint32_t map_key = 0;
+
+ if (!ebpf_rss_is_loaded(ctx)) {
+ return false;
+ }
+ if (bpf_map_update_elem(ctx->map_configuration,
+ &map_key, config, 0) < 0) {
+ return false;
+ }
+ return true;
+}
+
+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;
+ }
+ }
+ 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] = {};
+
+ if (!ebpf_rss_is_loaded(ctx) || toeplitz_key == NULL) {
+ return false;
+ }
+ 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;
+ }
+ return true;
+}
+
+bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
+ uint16_t *indirections_table, uint8_t *toeplitz_key)
+{
+ if (!ebpf_rss_is_loaded(ctx) || config == NULL ||
+ indirections_table == NULL || toeplitz_key == NULL) {
+ return false;
+ }
+
+ if (!ebpf_rss_set_config(ctx, config)) {
+ return false;
+ }
+
+ if (!ebpf_rss_set_indirections_table(ctx, indirections_table,
+ config->indirections_len)) {
+ return false;
+ }
+
+ if (!ebpf_rss_set_toepliz_key(ctx, toeplitz_key)) {
+ return false;
+ }
+
+ return true;
+}
+
+void ebpf_rss_unload(struct EBPFRSSContext *ctx)
+{
+ if (!ebpf_rss_is_loaded(ctx)) {
+ return;
+ }
+
+ rss_bpf__destroy(ctx->obj);
+ ctx->obj = NULL;
+}
diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
new file mode 100644
index 0000000000..bf3f2572c7
--- /dev/null
+++ b/ebpf/ebpf_rss.h
@@ -0,0 +1,44 @@
+/*
+ * eBPF RSS header
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ * Yuri Benditovich <yuri.benditovich@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_EBPF_RSS_H
+#define QEMU_EBPF_RSS_H
+
+struct EBPFRSSContext {
+ void *obj;
+ int program_fd;
+ int map_configuration;
+ int map_toeplitz_key;
+ int map_indirections_table;
+};
+
+struct EBPFRSSConfig {
+ uint8_t redirect;
+ uint8_t populate_hash;
+ uint32_t hash_types;
+ uint16_t indirections_len;
+ uint16_t default_queue;
+} __attribute__((packed));
+
+void ebpf_rss_init(struct EBPFRSSContext *ctx);
+
+bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx);
+
+bool ebpf_rss_load(struct EBPFRSSContext *ctx);
+
+bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
+ uint16_t *indirections_table, uint8_t *toeplitz_key);
+
+void ebpf_rss_unload(struct EBPFRSSContext *ctx);
+
+#endif /* QEMU_EBPF_RSS_H */
diff --git a/ebpf/meson.build b/ebpf/meson.build
new file mode 100644
index 0000000000..9cd0635370
--- /dev/null
+++ b/ebpf/meson.build
@@ -0,0 +1 @@
+common_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
new file mode 100644
index 0000000000..126683eb87
--- /dev/null
+++ b/ebpf/rss.bpf.skeleton.h
@@ -0,0 +1,431 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+
+/* THIS FILE IS AUTOGENERATED! */
+#ifndef __RSS_BPF_SKEL_H__
+#define __RSS_BPF_SKEL_H__
+
+#include <stdlib.h>
+#include <bpf/libbpf.h>
+
+struct rss_bpf {
+ struct bpf_object_skeleton *skeleton;
+ struct bpf_object *obj;
+ struct {
+ struct bpf_map *tap_rss_map_configurations;
+ struct bpf_map *tap_rss_map_indirection_table;
+ struct bpf_map *tap_rss_map_toeplitz_key;
+ } maps;
+ struct {
+ struct bpf_program *tun_rss_steering_prog;
+ } progs;
+ struct {
+ struct bpf_link *tun_rss_steering_prog;
+ } links;
+};
+
+static void
+rss_bpf__destroy(struct rss_bpf *obj)
+{
+ if (!obj)
+ return;
+ if (obj->skeleton)
+ bpf_object__destroy_skeleton(obj->skeleton);
+ free(obj);
+}
+
+static inline int
+rss_bpf__create_skeleton(struct rss_bpf *obj);
+
+static inline struct rss_bpf *
+rss_bpf__open_opts(const struct bpf_object_open_opts *opts)
+{
+ struct rss_bpf *obj;
+
+ obj = (struct rss_bpf *)calloc(1, sizeof(*obj));
+ if (!obj)
+ return NULL;
+ if (rss_bpf__create_skeleton(obj))
+ goto err;
+ if (bpf_object__open_skeleton(obj->skeleton, opts))
+ goto err;
+
+ return obj;
+err:
+ rss_bpf__destroy(obj);
+ return NULL;
+}
+
+static inline struct rss_bpf *
+rss_bpf__open(void)
+{
+ return rss_bpf__open_opts(NULL);
+}
+
+static inline int
+rss_bpf__load(struct rss_bpf *obj)
+{
+ return bpf_object__load_skeleton(obj->skeleton);
+}
+
+static inline struct rss_bpf *
+rss_bpf__open_and_load(void)
+{
+ struct rss_bpf *obj;
+
+ obj = rss_bpf__open();
+ if (!obj)
+ return NULL;
+ if (rss_bpf__load(obj)) {
+ rss_bpf__destroy(obj);
+ return NULL;
+ }
+ return obj;
+}
+
+static inline int
+rss_bpf__attach(struct rss_bpf *obj)
+{
+ return bpf_object__attach_skeleton(obj->skeleton);
+}
+
+static inline void
+rss_bpf__detach(struct rss_bpf *obj)
+{
+ return bpf_object__detach_skeleton(obj->skeleton);
+}
+
+static inline int
+rss_bpf__create_skeleton(struct rss_bpf *obj)
+{
+ struct bpf_object_skeleton *s;
+
+ s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s));
+ if (!s)
+ return -1;
+ obj->skeleton = s;
+
+ s->sz = sizeof(*s);
+ s->name = "rss_bpf";
+ s->obj = &obj->obj;
+
+ /* maps */
+ s->map_cnt = 3;
+ s->map_skel_sz = sizeof(*s->maps);
+ s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz);
+ if (!s->maps)
+ goto err;
+
+ s->maps[0].name = "tap_rss_map_configurations";
+ s->maps[0].map = &obj->maps.tap_rss_map_configurations;
+
+ s->maps[1].name = "tap_rss_map_indirection_table";
+ s->maps[1].map = &obj->maps.tap_rss_map_indirection_table;
+
+ s->maps[2].name = "tap_rss_map_toeplitz_key";
+ s->maps[2].map = &obj->maps.tap_rss_map_toeplitz_key;
+
+ /* programs */
+ s->prog_cnt = 1;
+ s->prog_skel_sz = sizeof(*s->progs);
+ s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz);
+ if (!s->progs)
+ goto err;
+
+ s->progs[0].name = "tun_rss_steering_prog";
+ s->progs[0].prog = &obj->progs.tun_rss_steering_prog;
+ s->progs[0].link = &obj->links.tun_rss_steering_prog;
+
+ s->data_sz = 8088;
+ s->data = (void *)"\
+\x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x18\x1d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0a\0\
+\x01\0\xbf\x18\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\
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+\0\0\0\0\0\0\0\x82\0\0\0\x11\0\x05\0\x28\0\0\0\0\0\0\0\x14\0\0\0\0\0\0\0\x01\0\
+\0\0\x11\0\x05\0\x14\0\0\0\0\0\0\0\x14\0\0\0\0\0\0\0\x40\0\0\0\x12\0\x03\0\0\0\
+\0\0\0\0\0\0\xd8\x13\0\0\0\0\0\0\x28\0\0\0\0\0\0\0\x01\0\0\0\x3a\0\0\0\x50\0\0\
+\0\0\0\0\0\x01\0\0\0\x3c\0\0\0\x80\x13\0\0\0\0\0\0\x01\0\0\0\x3b\0\0\0\x1c\0\0\
+\0\0\0\0\0\x01\0\0\0\x38\0\0\0\0\x74\x61\x70\x5f\x72\x73\x73\x5f\x6d\x61\x70\
+\x5f\x74\x6f\x65\x70\x6c\x69\x74\x7a\x5f\x6b\x65\x79\0\x2e\x74\x65\x78\x74\0\
+\x6d\x61\x70\x73\0\x74\x61\x70\x5f\x72\x73\x73\x5f\x6d\x61\x70\x5f\x63\x6f\x6e\
+\x66\x69\x67\x75\x72\x61\x74\x69\x6f\x6e\x73\0\x74\x75\x6e\x5f\x72\x73\x73\x5f\
+\x73\x74\x65\x65\x72\x69\x6e\x67\x5f\x70\x72\x6f\x67\0\x2e\x72\x65\x6c\x74\x75\
+\x6e\x5f\x72\x73\x73\x5f\x73\x74\x65\x65\x72\x69\x6e\x67\0\x5f\x6c\x69\x63\x65\
+\x6e\x73\x65\0\x2e\x72\x65\x6c\x2e\x65\x68\x5f\x66\x72\x61\x6d\x65\0\x74\x61\
+\x70\x5f\x72\x73\x73\x5f\x6d\x61\x70\x5f\x69\x6e\x64\x69\x72\x65\x63\x74\x69\
+\x6f\x6e\x5f\x74\x61\x62\x6c\x65\0\x72\x73\x73\x2e\x62\x70\x66\x2e\x63\0\x2e\
+\x73\x74\x72\x74\x61\x62\0\x2e\x73\x79\x6d\x74\x61\x62\0\x4c\x42\x42\x30\x5f\
+\x39\0\x4c\x42\x42\x30\x5f\x38\x39\0\x4c\x42\x42\x30\x5f\x36\x39\0\x4c\x42\x42\
+\x30\x5f\x35\x39\0\x4c\x42\x42\x30\x5f\x31\x39\0\x4c\x42\x42\x30\x5f\x31\x30\
+\x39\0\x4c\x42\x42\x30\x5f\x39\x38\0\x4c\x42\x42\x30\x5f\x37\x38\0\x4c\x42\x42\
+\x30\x5f\x34\x38\0\x4c\x42\x42\x30\x5f\x31\x38\0\x4c\x42\x42\x30\x5f\x38\x37\0\
+\x4c\x42\x42\x30\x5f\x34\x37\0\x4c\x42\x42\x30\x5f\x33\x37\0\x4c\x42\x42\x30\
+\x5f\x31\x37\0\x4c\x42\x42\x30\x5f\x31\x30\x37\0\x4c\x42\x42\x30\x5f\x39\x36\0\
+\x4c\x42\x42\x30\x5f\x37\x36\0\x4c\x42\x42\x30\x5f\x36\x36\0\x4c\x42\x42\x30\
+\x5f\x34\x36\0\x4c\x42\x42\x30\x5f\x33\x36\0\x4c\x42\x42\x30\x5f\x32\x36\0\x4c\
+\x42\x42\x30\x5f\x31\x30\x36\0\x4c\x42\x42\x30\x5f\x36\x35\0\x4c\x42\x42\x30\
+\x5f\x34\x35\0\x4c\x42\x42\x30\x5f\x33\x35\0\x4c\x42\x42\x30\x5f\x34\0\x4c\x42\
+\x42\x30\x5f\x35\x34\0\x4c\x42\x42\x30\x5f\x34\x34\0\x4c\x42\x42\x30\x5f\x32\
+\x34\0\x4c\x42\x42\x30\x5f\x31\x30\x34\0\x4c\x42\x42\x30\x5f\x39\x33\0\x4c\x42\
+\x42\x30\x5f\x38\x33\0\x4c\x42\x42\x30\x5f\x35\x33\0\x4c\x42\x42\x30\x5f\x34\
+\x33\0\x4c\x42\x42\x30\x5f\x32\x33\0\x4c\x42\x42\x30\x5f\x31\x30\x33\0\x4c\x42\
+\x42\x30\x5f\x38\x32\0\x4c\x42\x42\x30\x5f\x35\x32\0\x4c\x42\x42\x30\x5f\x31\
+\x30\x32\0\x4c\x42\x42\x30\x5f\x39\x31\0\x4c\x42\x42\x30\x5f\x38\x31\0\x4c\x42\
+\x42\x30\x5f\x37\x31\0\x4c\x42\x42\x30\x5f\x36\x31\0\x4c\x42\x42\x30\x5f\x35\
+\x31\0\x4c\x42\x42\x30\x5f\x34\x31\0\x4c\x42\x42\x30\x5f\x32\x31\0\x4c\x42\x42\
+\x30\x5f\x31\x31\0\x4c\x42\x42\x30\x5f\x31\x31\x31\0\x4c\x42\x42\x30\x5f\x31\
+\x30\x31\0\x4c\x42\x42\x30\x5f\x38\x30\0\x4c\x42\x42\x30\x5f\x36\x30\0\x4c\x42\
+\x42\x30\x5f\x35\x30\0\x4c\x42\x42\x30\x5f\x31\x30\0\x4c\x42\x42\x30\x5f\x31\
+\x31\x30\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\xaa\
+\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xa0\x1a\0\0\0\0\0\0\x71\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\x5a\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\xd8\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\x56\0\0\0\x09\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\x60\x1a\0\0\0\0\0\0\x30\0\0\0\0\0\0\0\x09\0\0\0\x03\0\0\0\x08\0\0\0\0\0\0\0\
+\x10\0\0\0\0\0\0\0\x20\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\
+\x14\0\0\0\0\0\0\x3c\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\x6c\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x54\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\x78\0\0\
+\0\x01\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x60\x14\0\0\0\0\0\0\x30\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\x74\0\0\0\x09\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x90\x1a\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x09\0\0\0\
+\x07\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\xb2\0\0\0\x02\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\x90\x14\0\0\0\0\0\0\xd0\x05\0\0\0\0\0\0\x01\0\0\0\x39\0\0\
+\0\x08\0\0\0\0\0\0\0\x18\0\0\0\0\0\0\0";
+
+ return 0;
+err:
+ bpf_object__destroy_skeleton(s);
+ return -1;
+}
+
+#endif /* __RSS_BPF_SKEL_H__ */
diff --git a/ebpf/trace-events b/ebpf/trace-events
new file mode 100644
index 0000000000..411b1e2be3
--- /dev/null
+++ b/ebpf/trace-events
@@ -0,0 +1,4 @@
+# See docs/devel/tracing.txt for syntax documentation.
+
+# ebpf-rss.c
+ebpf_error(const char *s1, const char *s2) "error in %s: %s"
diff --git a/ebpf/trace.h b/ebpf/trace.h
new file mode 100644
index 0000000000..abefc46ab1
--- /dev/null
+++ b/ebpf/trace.h
@@ -0,0 +1 @@
+#include "trace/trace-ebpf.h"
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 24d555e764..44c1ed92dc 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -45,6 +45,7 @@ static const int kernel_feature_bits[] = {
VIRTIO_NET_F_MTU,
VIRTIO_F_IOMMU_PLATFORM,
VIRTIO_F_RING_PACKED,
+ VIRTIO_NET_F_HASH_REPORT,
VHOST_INVALID_FEATURE_BIT
};
@@ -71,6 +72,8 @@ static const int user_feature_bits[] = {
VIRTIO_NET_F_MTU,
VIRTIO_F_IOMMU_PLATFORM,
VIRTIO_F_RING_PACKED,
+ VIRTIO_NET_F_RSS,
+ VIRTIO_NET_F_HASH_REPORT,
/* This bit implies RARP isn't sent by QEMU out of band */
VIRTIO_NET_F_GUEST_ANNOUNCE,
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 05bd50d3f6..bd7958b9f0 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -737,8 +737,9 @@ static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
return features;
}
- virtio_clear_feature(&features, VIRTIO_NET_F_RSS);
- virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT);
+ if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
+ virtio_clear_feature(&features, VIRTIO_NET_F_RSS);
+ }
features = vhost_net_get_features(get_vhost_net(nc->peer), features);
vdev->backend_features = features;
@@ -1163,12 +1164,79 @@ static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
}
}
+static void virtio_net_detach_epbf_rss(VirtIONet *n);
+
static void virtio_net_disable_rss(VirtIONet *n)
{
if (n->rss_data.enabled) {
trace_virtio_net_rss_disable();
}
n->rss_data.enabled = false;
+
+ virtio_net_detach_epbf_rss(n);
+}
+
+static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd)
+{
+ NetClientState *nc = qemu_get_peer(qemu_get_queue(nic), 0);
+ if (nc == NULL || nc->info->set_steering_ebpf == NULL) {
+ return false;
+ }
+
+ return nc->info->set_steering_ebpf(nc, prog_fd);
+}
+
+static void rss_data_to_rss_config(struct VirtioNetRssData *data,
+ struct EBPFRSSConfig *config)
+{
+ config->redirect = data->redirect;
+ config->populate_hash = data->populate_hash;
+ config->hash_types = data->hash_types;
+ config->indirections_len = data->indirections_len;
+ config->default_queue = data->default_queue;
+}
+
+static bool virtio_net_attach_epbf_rss(VirtIONet *n)
+{
+ struct EBPFRSSConfig config = {};
+
+ if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
+ return false;
+ }
+
+ rss_data_to_rss_config(&n->rss_data, &config);
+
+ if (!ebpf_rss_set_all(&n->ebpf_rss, &config,
+ n->rss_data.indirections_table, n->rss_data.key)) {
+ return false;
+ }
+
+ if (!virtio_net_attach_ebpf_to_backend(n->nic, n->ebpf_rss.program_fd)) {
+ return false;
+ }
+
+ return true;
+}
+
+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)
+{
+ if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
+ /* backend does't support steering ebpf */
+ return false;
+ }
+
+ return ebpf_rss_load(&n->ebpf_rss);
+}
+
+static void virtio_net_unload_ebpf(VirtIONet *n)
+{
+ virtio_net_attach_ebpf_to_backend(n->nic, -1);
+ ebpf_rss_unload(&n->ebpf_rss);
}
static uint16_t virtio_net_handle_rss(VirtIONet *n,
@@ -1283,6 +1351,25 @@ static uint16_t virtio_net_handle_rss(VirtIONet *n,
goto error;
}
n->rss_data.enabled = true;
+
+ if (!n->rss_data.populate_hash) {
+ if (!virtio_net_attach_epbf_rss(n)) {
+ /* EBPF must be loaded for vhost */
+ if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
+ warn_report("Can't load eBPF RSS for vhost");
+ goto error;
+ }
+ /* fallback to software RSS */
+ warn_report("Can't load eBPF RSS - fallback to software RSS");
+ n->rss_data.enabled_software_rss = true;
+ }
+ } else {
+ /* use software RSS for hash populating */
+ /* and detach eBPF if was loaded before */
+ virtio_net_detach_epbf_rss(n);
+ n->rss_data.enabled_software_rss = true;
+ }
+
trace_virtio_net_rss_enable(n->rss_data.hash_types,
n->rss_data.indirections_len,
temp.b);
@@ -1668,7 +1755,7 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
return -1;
}
- if (!no_rss && n->rss_data.enabled) {
+ if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) {
int index = virtio_net_process_rss(nc, buf, size);
if (index >= 0) {
NetClientState *nc2 = qemu_get_subqueue(n->nic, index);
@@ -2772,6 +2859,19 @@ static int virtio_net_post_load_device(void *opaque, int version_id)
}
if (n->rss_data.enabled) {
+ n->rss_data.enabled_software_rss = n->rss_data.populate_hash;
+ if (!n->rss_data.populate_hash) {
+ if (!virtio_net_attach_epbf_rss(n)) {
+ if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
+ warn_report("Can't post-load eBPF RSS for vhost");
+ } else {
+ warn_report("Can't post-load eBPF RSS - "
+ "fallback to software RSS");
+ n->rss_data.enabled_software_rss = true;
+ }
+ }
+ }
+
trace_virtio_net_rss_enable(n->rss_data.hash_types,
n->rss_data.indirections_len,
sizeof(n->rss_data.key));
@@ -3352,6 +3452,10 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
n->qdev = dev;
net_rx_pkt_init(&n->rx_pkt, false);
+
+ if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
+ virtio_net_load_ebpf(n);
+ }
}
static void virtio_net_device_unrealize(DeviceState *dev)
@@ -3360,6 +3464,10 @@ static void virtio_net_device_unrealize(DeviceState *dev)
VirtIONet *n = VIRTIO_NET(dev);
int i, max_queues;
+ if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
+ virtio_net_unload_ebpf(n);
+ }
+
/* This will stop vhost backend if appropriate. */
virtio_net_set_status(vdev, 0);
@@ -3403,6 +3511,8 @@ static void virtio_net_instance_init(Object *obj)
device_add_bootindex_property(obj, &n->nic_conf.bootindex,
"bootindex", "/ethernet-phy@0",
DEVICE(n));
+
+ ebpf_rss_init(&n->ebpf_rss);
}
static int virtio_net_pre_save(void *opaque)
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index 7e96d193aa..824a69c23f 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -21,6 +21,8 @@
#include "qemu/option_int.h"
#include "qom/object.h"
+#include "ebpf/ebpf_rss.h"
+
#define TYPE_VIRTIO_NET "virtio-net-device"
OBJECT_DECLARE_SIMPLE_TYPE(VirtIONet, VIRTIO_NET)
@@ -130,6 +132,7 @@ typedef struct VirtioNetRscChain {
typedef struct VirtioNetRssData {
bool enabled;
+ bool enabled_software_rss;
bool redirect;
bool populate_hash;
uint32_t hash_types;
@@ -209,6 +212,7 @@ struct VirtIONet {
Notifier migration_state;
VirtioNetRssData rss_data;
struct NetRxPkt *rx_pkt;
+ struct EBPFRSSContext ebpf_rss;
};
void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
diff --git a/include/net/net.h b/include/net/net.h
index 1ef536d771..5d1508081f 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -61,6 +61,7 @@ typedef int (SetVnetBE)(NetClientState *, bool);
typedef struct SocketReadState SocketReadState;
typedef void (SocketReadStateFinalize)(SocketReadState *rs);
typedef void (NetAnnounce)(NetClientState *);
+typedef bool (SetSteeringEBPF)(NetClientState *, int);
typedef struct NetClientInfo {
NetClientDriver type;
@@ -82,6 +83,7 @@ typedef struct NetClientInfo {
SetVnetLE *set_vnet_le;
SetVnetBE *set_vnet_be;
NetAnnounce *announce;
+ SetSteeringEBPF *set_steering_ebpf;
} NetClientInfo;
struct NetClientState {
diff --git a/meson.build b/meson.build
index a45f1a844f..e63dcf7bd4 100644
--- a/meson.build
+++ b/meson.build
@@ -1032,6 +1032,23 @@ if not get_option('fuse_lseek').disabled()
endif
endif
+# libbpf
+libbpf = dependency('libbpf', required: get_option('bpf'), method: 'pkg-config')
+if libbpf.found() and not cc.links('''
+ #include <bpf/libbpf.h>
+ int main(void)
+ {
+ bpf_object__destroy_skeleton(NULL);
+ return 0;
+ }''', dependencies: libbpf)
+ libbpf = not_found
+ if get_option('bpf').enabled()
+ error('libbpf skeleton test failed')
+ else
+ warning('libbpf skeleton test failed, disabling')
+ endif
+endif
+
if get_option('cfi')
cfi_flags=[]
# Check for dependency on LTO
@@ -1131,6 +1148,7 @@ endif
config_host_data.set('CONFIG_GTK', gtk.found())
config_host_data.set('CONFIG_LIBATTR', have_old_libattr)
config_host_data.set('CONFIG_LIBCAP_NG', libcap_ng.found())
+config_host_data.set('CONFIG_EBPF', libbpf.found())
config_host_data.set('CONFIG_LIBISCSI', libiscsi.found())
config_host_data.set('CONFIG_LIBNFS', libnfs.found())
config_host_data.set('CONFIG_RBD', rbd.found())
@@ -1800,6 +1818,7 @@ if have_system
'backends',
'backends/tpm',
'chardev',
+ 'ebpf',
'hw/9pfs',
'hw/acpi',
'hw/adc',
@@ -1992,6 +2011,9 @@ subdir('accel')
subdir('plugins')
subdir('bsd-user')
subdir('linux-user')
+subdir('ebpf')
+
+common_ss.add(libbpf)
bsd_user_ss.add(files('gdbstub.c'))
specific_ss.add_all(when: 'CONFIG_BSD_USER', if_true: bsd_user_ss)
@@ -2702,6 +2724,7 @@ summary_info += {'RDMA support': config_host.has_key('CONFIG_RDMA')}
summary_info += {'PVRDMA support': config_host.has_key('CONFIG_PVRDMA')}
summary_info += {'fdt support': fdt_opt == 'disabled' ? false : fdt_opt}
summary_info += {'libcap-ng support': libcap_ng.found()}
+summary_info += {'bpf support': libbpf.found()}
# TODO: add back protocol and server version
summary_info += {'spice support': config_host.has_key('CONFIG_SPICE')}
summary_info += {'rbd support': rbd.found()}
diff --git a/meson_options.txt b/meson_options.txt
index 91034420a1..3d304cac96 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -58,6 +58,8 @@ option('bzip2', type : 'feature', value : 'auto',
description: 'bzip2 support for DMG images')
option('cap_ng', type : 'feature', value : 'auto',
description: 'cap_ng support')
+option('bpf', type : 'feature', value : 'auto',
+ description: 'eBPF support')
option('cocoa', type : 'feature', value : 'auto',
description: 'Cocoa user interface (macOS only)')
option('curl', type : 'feature', value : 'auto',
diff --git a/net/tap-bsd.c b/net/tap-bsd.c
index 59dfcdfae0..e45a6d124e 100644
--- a/net/tap-bsd.c
+++ b/net/tap-bsd.c
@@ -251,3 +251,8 @@ int tap_fd_get_ifname(int fd, char *ifname)
{
return -1;
}
+
+int tap_fd_set_steering_ebpf(int fd, int prog_fd)
+{
+ return -1;
+}
diff --git a/net/tap-linux.c b/net/tap-linux.c
index b0635e9e32..9584769740 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -316,3 +316,16 @@ int tap_fd_get_ifname(int fd, char *ifname)
pstrcpy(ifname, sizeof(ifr.ifr_name), ifr.ifr_name);
return 0;
}
+
+int tap_fd_set_steering_ebpf(int fd, int prog_fd)
+{
+ if (ioctl(fd, TUNSETSTEERINGEBPF, (void *) &prog_fd) != 0) {
+ error_report("Issue while setting TUNSETSTEERINGEBPF:"
+ " %s with fd: %d, prog_fd: %d",
+ strerror(errno), fd, prog_fd);
+
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/net/tap-linux.h b/net/tap-linux.h
index 2f36d100fc..1d06fe0de6 100644
--- a/net/tap-linux.h
+++ b/net/tap-linux.h
@@ -31,6 +31,7 @@
#define TUNSETQUEUE _IOW('T', 217, int)
#define TUNSETVNETLE _IOW('T', 220, int)
#define TUNSETVNETBE _IOW('T', 222, int)
+#define TUNSETSTEERINGEBPF _IOR('T', 224, int)
#endif
diff --git a/net/tap-solaris.c b/net/tap-solaris.c
index 0475a58207..d85224242b 100644
--- a/net/tap-solaris.c
+++ b/net/tap-solaris.c
@@ -255,3 +255,8 @@ int tap_fd_get_ifname(int fd, char *ifname)
{
return -1;
}
+
+int tap_fd_set_steering_ebpf(int fd, int prog_fd)
+{
+ return -1;
+}
diff --git a/net/tap-stub.c b/net/tap-stub.c
index de525a2e69..a0fa25804b 100644
--- a/net/tap-stub.c
+++ b/net/tap-stub.c
@@ -85,3 +85,8 @@ int tap_fd_get_ifname(int fd, char *ifname)
{
return -1;
}
+
+int tap_fd_set_steering_ebpf(int fd, int prog_fd)
+{
+ return -1;
+}
diff --git a/net/tap.c b/net/tap.c
index bae895e287..f5686bbf77 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -347,6 +347,14 @@ static void tap_poll(NetClientState *nc, bool enable)
tap_write_poll(s, enable);
}
+static bool tap_set_steering_ebpf(NetClientState *nc, int prog_fd)
+{
+ TAPState *s = DO_UPCAST(TAPState, nc, nc);
+ assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
+
+ return tap_fd_set_steering_ebpf(s->fd, prog_fd) == 0;
+}
+
int tap_get_fd(NetClientState *nc)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
@@ -372,6 +380,7 @@ static NetClientInfo net_tap_info = {
.set_vnet_hdr_len = tap_set_vnet_hdr_len,
.set_vnet_le = tap_set_vnet_le,
.set_vnet_be = tap_set_vnet_be,
+ .set_steering_ebpf = tap_set_steering_ebpf,
};
static TAPState *net_tap_fd_init(NetClientState *peer,
diff --git a/net/tap_int.h b/net/tap_int.h
index 225a49ea48..547f8a5a28 100644
--- a/net/tap_int.h
+++ b/net/tap_int.h
@@ -44,5 +44,6 @@ int tap_fd_set_vnet_be(int fd, int vnet_is_be);
int tap_fd_enable(int fd);
int tap_fd_disable(int fd);
int tap_fd_get_ifname(int fd, char *ifname);
+int tap_fd_set_steering_ebpf(int fd, int prog_fd);
#endif /* NET_TAP_INT_H */
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index fe659ec9e2..8b14215549 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -54,6 +54,8 @@ const int vdpa_feature_bits[] = {
VIRTIO_NET_F_MTU,
VIRTIO_F_IOMMU_PLATFORM,
VIRTIO_F_RING_PACKED,
+ VIRTIO_NET_F_RSS,
+ VIRTIO_NET_F_HASH_REPORT,
VIRTIO_NET_F_GUEST_ANNOUNCE,
VIRTIO_NET_F_STATUS,
VHOST_INVALID_FEATURE_BIT
diff --git a/tools/ebpf/Makefile.ebpf b/tools/ebpf/Makefile.ebpf
new file mode 100755
index 0000000000..8f327ae3b8
--- /dev/null
+++ b/tools/ebpf/Makefile.ebpf
@@ -0,0 +1,21 @@
+OBJS = rss.bpf.o
+
+LLC ?= llc
+CLANG ?= clang
+INC_FLAGS = `$(CLANG) -print-file-name=include`
+EXTRA_CFLAGS ?= -O2 -emit-llvm -fno-stack-protector
+
+all: $(OBJS)
+
+.PHONY: clean
+
+clean:
+ rm -f $(OBJS)
+
+$(OBJS): %.o:%.c
+ $(CLANG) $(INC_FLAGS) \
+ -D__KERNEL__ -D__ASM_SYSREG_H \
+ -I../include $(LINUXINCLUDE) \
+ $(EXTRA_CFLAGS) -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
+ bpftool gen skeleton rss.bpf.o > rss.bpf.skeleton.h
+ cp rss.bpf.skeleton.h ../../ebpf/
diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
new file mode 100644
index 0000000000..e85ec55f9b
--- /dev/null
+++ b/tools/ebpf/rss.bpf.c
@@ -0,0 +1,571 @@
+/*
+ * eBPF RSS program
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ * Andrew Melnychenko <andrew@daynix.com>
+ * Yuri Benditovich <yuri.benditovich@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * Prepare:
+ * Requires llvm, clang, bpftool, linux kernel tree
+ *
+ * Build rss.bpf.skeleton.h:
+ * make -f Makefile.ebpf clean all
+ */
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <linux/bpf.h>
+
+#include <linux/in.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+
+#include <linux/udp.h>
+#include <linux/tcp.h>
+
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+#include <linux/virtio_net.h>
+
+#define INDIRECTION_TABLE_SIZE 128
+#define HASH_CALCULATION_BUFFER_SIZE 36
+
+struct rss_config_t {
+ __u8 redirect;
+ __u8 populate_hash;
+ __u32 hash_types;
+ __u16 indirections_len;
+ __u16 default_queue;
+} __attribute__((packed));
+
+struct toeplitz_key_data_t {
+ __u32 leftmost_32_bits;
+ __u8 next_byte[HASH_CALCULATION_BUFFER_SIZE];
+};
+
+struct packet_hash_info_t {
+ __u8 is_ipv4;
+ __u8 is_ipv6;
+ __u8 is_udp;
+ __u8 is_tcp;
+ __u8 is_ipv6_ext_src;
+ __u8 is_ipv6_ext_dst;
+ __u8 is_fragmented;
+
+ __u16 src_port;
+ __u16 dst_port;
+
+ union {
+ struct {
+ __be32 in_src;
+ __be32 in_dst;
+ };
+
+ struct {
+ struct in6_addr in6_src;
+ struct in6_addr in6_dst;
+ struct in6_addr in6_ext_src;
+ struct in6_addr in6_ext_dst;
+ };
+ };
+};
+
+struct bpf_map_def SEC("maps")
+tap_rss_map_configurations = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(__u32),
+ .value_size = sizeof(struct rss_config_t),
+ .max_entries = 1,
+};
+
+struct bpf_map_def SEC("maps")
+tap_rss_map_toeplitz_key = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(__u32),
+ .value_size = sizeof(struct toeplitz_key_data_t),
+ .max_entries = 1,
+};
+
+struct bpf_map_def SEC("maps")
+tap_rss_map_indirection_table = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(__u32),
+ .value_size = sizeof(__u16),
+ .max_entries = INDIRECTION_TABLE_SIZE,
+};
+
+static inline void net_rx_rss_add_chunk(__u8 *rss_input, size_t *bytes_written,
+ const void *ptr, size_t size) {
+ __builtin_memcpy(&rss_input[*bytes_written], ptr, size);
+ *bytes_written += size;
+}
+
+static inline
+void net_toeplitz_add(__u32 *result,
+ __u8 *input,
+ __u32 len
+ , struct toeplitz_key_data_t *key) {
+
+ __u32 accumulator = *result;
+ __u32 leftmost_32_bits = key->leftmost_32_bits;
+ __u32 byte;
+
+ for (byte = 0; byte < HASH_CALCULATION_BUFFER_SIZE; byte++) {
+ __u8 input_byte = input[byte];
+ __u8 key_byte = key->next_byte[byte];
+ __u8 bit;
+
+ for (bit = 0; bit < 8; bit++) {
+ if (input_byte & (1 << 7)) {
+ accumulator ^= leftmost_32_bits;
+ }
+
+ leftmost_32_bits =
+ (leftmost_32_bits << 1) | ((key_byte & (1 << 7)) >> 7);
+
+ input_byte <<= 1;
+ key_byte <<= 1;
+ }
+ }
+
+ *result = accumulator;
+}
+
+
+static inline int ip6_extension_header_type(__u8 hdr_type)
+{
+ switch (hdr_type) {
+ case IPPROTO_HOPOPTS:
+ case IPPROTO_ROUTING:
+ case IPPROTO_FRAGMENT:
+ case IPPROTO_ICMPV6:
+ case IPPROTO_NONE:
+ case IPPROTO_DSTOPTS:
+ case IPPROTO_MH:
+ return 1;
+ default:
+ return 0;
+ }
+}
+/*
+ * According to
+ * https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml
+ * we expect that there are would be no more than 11 extensions in IPv6 header,
+ * also there is 27 TLV options for Destination and Hop-by-hop extensions.
+ * Need to choose reasonable amount of maximum extensions/options we may
+ * check to find ext src/dst.
+ */
+#define IP6_EXTENSIONS_COUNT 11
+#define IP6_OPTIONS_COUNT 30
+
+static inline int parse_ipv6_ext(struct __sk_buff *skb,
+ struct packet_hash_info_t *info,
+ __u8 *l4_protocol, size_t *l4_offset)
+{
+ int err = 0;
+
+ if (!ip6_extension_header_type(*l4_protocol)) {
+ return 0;
+ }
+
+ struct ipv6_opt_hdr ext_hdr = {};
+
+ for (unsigned int i = 0; i < IP6_EXTENSIONS_COUNT; ++i) {
+
+ err = bpf_skb_load_bytes_relative(skb, *l4_offset, &ext_hdr,
+ sizeof(ext_hdr), BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ if (*l4_protocol == IPPROTO_ROUTING) {
+ struct ipv6_rt_hdr ext_rt = {};
+
+ err = bpf_skb_load_bytes_relative(skb, *l4_offset, &ext_rt,
+ sizeof(ext_rt), BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ if ((ext_rt.type == IPV6_SRCRT_TYPE_2) &&
+ (ext_rt.hdrlen == sizeof(struct in6_addr) / 8) &&
+ (ext_rt.segments_left == 1)) {
+
+ err = bpf_skb_load_bytes_relative(skb,
+ *l4_offset + offsetof(struct rt2_hdr, addr),
+ &info->in6_ext_dst, sizeof(info->in6_ext_dst),
+ BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ info->is_ipv6_ext_dst = 1;
+ }
+
+ } else if (*l4_protocol == IPPROTO_DSTOPTS) {
+ struct ipv6_opt_t {
+ __u8 type;
+ __u8 length;
+ } __attribute__((packed)) opt = {};
+
+ size_t opt_offset = sizeof(ext_hdr);
+
+ for (unsigned int j = 0; j < IP6_OPTIONS_COUNT; ++j) {
+ err = bpf_skb_load_bytes_relative(skb, *l4_offset + opt_offset,
+ &opt, sizeof(opt), BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ if (opt.type == IPV6_TLV_HAO) {
+ err = bpf_skb_load_bytes_relative(skb,
+ *l4_offset + opt_offset
+ + offsetof(struct ipv6_destopt_hao, addr),
+ &info->in6_ext_src, sizeof(info->in6_ext_src),
+ BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ info->is_ipv6_ext_src = 1;
+ break;
+ }
+
+ opt_offset += (opt.type == IPV6_TLV_PAD1) ?
+ 1 : opt.length + sizeof(opt);
+
+ if (opt_offset + 1 >= ext_hdr.hdrlen * 8) {
+ break;
+ }
+ }
+ } else if (*l4_protocol == IPPROTO_FRAGMENT) {
+ info->is_fragmented = true;
+ }
+
+ *l4_protocol = ext_hdr.nexthdr;
+ *l4_offset += (ext_hdr.hdrlen + 1) * 8;
+
+ if (!ip6_extension_header_type(ext_hdr.nexthdr)) {
+ return 0;
+ }
+ }
+
+ return 0;
+error:
+ return err;
+}
+
+static __be16 parse_eth_type(struct __sk_buff *skb)
+{
+ unsigned int offset = 12;
+ __be16 ret = 0;
+ int err = 0;
+
+ err = bpf_skb_load_bytes_relative(skb, offset, &ret, sizeof(ret),
+ BPF_HDR_START_MAC);
+ if (err) {
+ return 0;
+ }
+
+ switch (bpf_ntohs(ret)) {
+ case ETH_P_8021AD:
+ offset += 4;
+ case ETH_P_8021Q:
+ offset += 4;
+ err = bpf_skb_load_bytes_relative(skb, offset, &ret, sizeof(ret),
+ BPF_HDR_START_MAC);
+ default:
+ break;
+ }
+
+ if (err) {
+ return 0;
+ }
+
+ return ret;
+}
+
+static inline int parse_packet(struct __sk_buff *skb,
+ struct packet_hash_info_t *info)
+{
+ int err = 0;
+
+ if (!info || !skb) {
+ return -1;
+ }
+
+ size_t l4_offset = 0;
+ __u8 l4_protocol = 0;
+ __u16 l3_protocol = bpf_ntohs(parse_eth_type(skb));
+ if (l3_protocol == 0) {
+ err = -1;
+ goto error;
+ }
+
+ if (l3_protocol == ETH_P_IP) {
+ info->is_ipv4 = 1;
+
+ struct iphdr ip = {};
+ err = bpf_skb_load_bytes_relative(skb, 0, &ip, sizeof(ip),
+ BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ info->in_src = ip.saddr;
+ info->in_dst = ip.daddr;
+ info->is_fragmented = !!ip.frag_off;
+
+ l4_protocol = ip.protocol;
+ l4_offset = ip.ihl * 4;
+ } else if (l3_protocol == ETH_P_IPV6) {
+ info->is_ipv6 = 1;
+
+ struct ipv6hdr ip6 = {};
+ err = bpf_skb_load_bytes_relative(skb, 0, &ip6, sizeof(ip6),
+ BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ info->in6_src = ip6.saddr;
+ info->in6_dst = ip6.daddr;
+
+ l4_protocol = ip6.nexthdr;
+ l4_offset = sizeof(ip6);
+
+ err = parse_ipv6_ext(skb, info, &l4_protocol, &l4_offset);
+ if (err) {
+ goto error;
+ }
+ }
+
+ if (l4_protocol != 0 && !info->is_fragmented) {
+ if (l4_protocol == IPPROTO_TCP) {
+ info->is_tcp = 1;
+
+ struct tcphdr tcp = {};
+ err = bpf_skb_load_bytes_relative(skb, l4_offset, &tcp, sizeof(tcp),
+ BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ info->src_port = tcp.source;
+ info->dst_port = tcp.dest;
+ } else if (l4_protocol == IPPROTO_UDP) { /* TODO: add udplite? */
+ info->is_udp = 1;
+
+ struct udphdr udp = {};
+ err = bpf_skb_load_bytes_relative(skb, l4_offset, &udp, sizeof(udp),
+ BPF_HDR_START_NET);
+ if (err) {
+ goto error;
+ }
+
+ info->src_port = udp.source;
+ info->dst_port = udp.dest;
+ }
+ }
+
+ return 0;
+
+error:
+ return err;
+}
+
+static inline __u32 calculate_rss_hash(struct __sk_buff *skb,
+ struct rss_config_t *config, struct toeplitz_key_data_t *toe)
+{
+ __u8 rss_input[HASH_CALCULATION_BUFFER_SIZE] = {};
+ size_t bytes_written = 0;
+ __u32 result = 0;
+ int err = 0;
+ struct packet_hash_info_t packet_info = {};
+
+ err = parse_packet(skb, &packet_info);
+ if (err) {
+ return 0;
+ }
+
+ if (packet_info.is_ipv4) {
+ if (packet_info.is_tcp &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) {
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in_src,
+ sizeof(packet_info.in_src));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in_dst,
+ sizeof(packet_info.in_dst));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.src_port,
+ sizeof(packet_info.src_port));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.dst_port,
+ sizeof(packet_info.dst_port));
+ } else if (packet_info.is_udp &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) {
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in_src,
+ sizeof(packet_info.in_src));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in_dst,
+ sizeof(packet_info.in_dst));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.src_port,
+ sizeof(packet_info.src_port));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.dst_port,
+ sizeof(packet_info.dst_port));
+ } else if (config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in_src,
+ sizeof(packet_info.in_src));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in_dst,
+ sizeof(packet_info.in_dst));
+ }
+ } else if (packet_info.is_ipv6) {
+ if (packet_info.is_tcp &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) {
+
+ if (packet_info.is_ipv6_ext_src &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) {
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_ext_src,
+ sizeof(packet_info.in6_ext_src));
+ } else {
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_src,
+ sizeof(packet_info.in6_src));
+ }
+ if (packet_info.is_ipv6_ext_dst &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) {
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_ext_dst,
+ sizeof(packet_info.in6_ext_dst));
+ } else {
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_dst,
+ sizeof(packet_info.in6_dst));
+ }
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.src_port,
+ sizeof(packet_info.src_port));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.dst_port,
+ sizeof(packet_info.dst_port));
+ } else if (packet_info.is_udp &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) {
+
+ if (packet_info.is_ipv6_ext_src &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) {
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_ext_src,
+ sizeof(packet_info.in6_ext_src));
+ } else {
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_src,
+ sizeof(packet_info.in6_src));
+ }
+ if (packet_info.is_ipv6_ext_dst &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) {
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_ext_dst,
+ sizeof(packet_info.in6_ext_dst));
+ } else {
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_dst,
+ sizeof(packet_info.in6_dst));
+ }
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.src_port,
+ sizeof(packet_info.src_port));
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.dst_port,
+ sizeof(packet_info.dst_port));
+
+ } else if (config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
+ if (packet_info.is_ipv6_ext_src &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) {
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_ext_src,
+ sizeof(packet_info.in6_ext_src));
+ } else {
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_src,
+ sizeof(packet_info.in6_src));
+ }
+ if (packet_info.is_ipv6_ext_dst &&
+ config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) {
+
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_ext_dst,
+ sizeof(packet_info.in6_ext_dst));
+ } else {
+ net_rx_rss_add_chunk(rss_input, &bytes_written,
+ &packet_info.in6_dst,
+ sizeof(packet_info.in6_dst));
+ }
+ }
+ }
+
+ if (bytes_written) {
+ net_toeplitz_add(&result, rss_input, bytes_written, toe);
+ }
+
+ return result;
+}
+
+SEC("tun_rss_steering")
+int tun_rss_steering_prog(struct __sk_buff *skb)
+{
+
+ struct rss_config_t *config;
+ struct toeplitz_key_data_t *toe;
+
+ __u32 key = 0;
+ __u32 hash = 0;
+
+ config = bpf_map_lookup_elem(&tap_rss_map_configurations, &key);
+ toe = bpf_map_lookup_elem(&tap_rss_map_toeplitz_key, &key);
+
+ if (config && toe) {
+ if (!config->redirect) {
+ return config->default_queue;
+ }
+
+ hash = calculate_rss_hash(skb, config, toe);
+ if (hash) {
+ __u32 table_idx = hash % config->indirections_len;
+ __u16 *queue = 0;
+
+ queue = bpf_map_lookup_elem(&tap_rss_map_indirection_table,
+ &table_idx);
+
+ if (queue) {
+ return *queue;
+ }
+ }
+
+ return config->default_queue;
+ }
+
+ return -1;
+}
+
+char _license[] SEC("license") = "GPL v2";
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-11-21 18:41:55 +0100