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/*
* 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;
}
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