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Merge remote-tracking branch 'remotes/jasowang/tags/net-pull-request' into staging

# gpg: Signature made Fri 04 Jun 2021 08:26:16 BST
# gpg:                using RSA key EF04965B398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 215D 46F4 8246 689E C77F  3562 EF04 965B 398D 6211

* remotes/jasowang/tags/net-pull-request:
  MAINTAINERS: Added eBPF maintainers information.
  docs: Added eBPF documentation.
  virtio-net: Added eBPF RSS to virtio-net.
  ebpf: Added eBPF RSS loader.
  ebpf: Added eBPF RSS program.
  net: Added SetSteeringEBPF method for NetClientState.
  net/tap: Added TUNSETSTEERINGEBPF code.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2021-06-04 13:38:48 +01:00
parent 5a95f5ce3c 90322e646e
commit 1cbd2d9149
27 changed files with 1607 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
MAINTAINERS
View File

@ -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

8
configure vendored
View File

@ -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 \

125
docs/devel/ebpf_rss.rst Normal file
View File

@ -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.

1
docs/devel/index.rst
View File

@ -43,3 +43,4 @@ Contents:
qom
block-coroutine-wrapper
multi-process
ebpf_rss

40
ebpf/ebpf_rss-stub.c Normal file
View File

@ -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)
{
}

165
ebpf/ebpf_rss.c Normal file
View File

@ -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;
}

44
ebpf/ebpf_rss.h Normal file
View File

@ -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 */

1
ebpf/meson.build Normal file
View File

@ -0,0 +1 @@
common_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))

431
ebpf/rss.bpf.skeleton.h Normal file
View File

@ -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\
\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\x07\0\0\0\0\0\0\
\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x66\x02\0\0\0\0\xbf\x79\0\0\
\0\0\0\0\x15\x09\x64\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
\0\x5d\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc0\xff\0\0\0\0\x7b\x1a\xb8\xff\
\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x7b\x1a\xa0\xff\0\0\0\
\0\x63\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\x1a\x88\xff\0\0\0\0\x7b\
\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\x70\xff\0\0\0\0\x7b\x1a\
\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\xff\0\0\0\0\x7b\x1a\x50\
\xff\0\0\0\0\x15\x08\x4c\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
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\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__ */

4
ebpf/trace-events Normal file
View File

@ -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"

1
ebpf/trace.h Normal file
View File

@ -0,0 +1 @@
#include "trace/trace-ebpf.h"

3
hw/net/vhost_net.c
View File

@ -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,

116
hw/net/virtio-net.c
View File

@ -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)

4
include/hw/virtio/virtio-net.h
View File

@ -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,

2
include/net/net.h
View File

@ -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 {

23
meson.build
View File

@ -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()}

2
meson_options.txt
View File

@ -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',

5
net/tap-bsd.c
View File

@ -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;
}

13
net/tap-linux.c
View File

@ -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;
}

1
net/tap-linux.h
View File

@ -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

5
net/tap-solaris.c
View File

@ -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;
}

5
net/tap-stub.c
View File

@ -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;
}

9
net/tap.c
View File

@ -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,

1
net/tap_int.h
View File

@ -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 */

2
net/vhost-vdpa.c
View File

@ -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

21
tools/ebpf/Makefile.ebpf Executable file
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@ -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/

571
tools/ebpf/rss.bpf.c Normal file
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@ -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";