2021-05-14 13:48:32 +02:00
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/*
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* eBPF RSS loader
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*
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* Developed by Daynix Computing LTD (http://www.daynix.com)
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*
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* Authors:
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* Andrew Melnychenko <andrew@daynix.com>
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* Yuri Benditovich <yuri.benditovich@daynix.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/error-report.h"
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#include <bpf/libbpf.h>
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#include <bpf/bpf.h>
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#include "hw/virtio/virtio-net.h" /* VIRTIO_NET_RSS_MAX_TABLE_LEN */
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#include "ebpf/ebpf_rss.h"
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#include "ebpf/rss.bpf.skeleton.h"
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#include "trace.h"
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void ebpf_rss_init(struct EBPFRSSContext *ctx)
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{
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if (ctx != NULL) {
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ctx->obj = NULL;
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}
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}
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bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx)
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{
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return ctx != NULL && ctx->obj != NULL;
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}
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bool ebpf_rss_load(struct EBPFRSSContext *ctx)
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{
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struct rss_bpf *rss_bpf_ctx;
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if (ctx == NULL) {
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return false;
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}
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rss_bpf_ctx = rss_bpf__open();
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if (rss_bpf_ctx == NULL) {
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trace_ebpf_error("eBPF RSS", "can not open eBPF RSS object");
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goto error;
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}
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2022-05-27 21:06:58 +02:00
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bpf_program__set_type(rss_bpf_ctx->progs.tun_rss_steering_prog, BPF_PROG_TYPE_SOCKET_FILTER);
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2021-05-14 13:48:32 +02:00
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if (rss_bpf__load(rss_bpf_ctx)) {
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trace_ebpf_error("eBPF RSS", "can not load RSS program");
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goto error;
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}
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ctx->obj = rss_bpf_ctx;
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ctx->program_fd = bpf_program__fd(
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rss_bpf_ctx->progs.tun_rss_steering_prog);
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ctx->map_configuration = bpf_map__fd(
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rss_bpf_ctx->maps.tap_rss_map_configurations);
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ctx->map_indirections_table = bpf_map__fd(
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rss_bpf_ctx->maps.tap_rss_map_indirection_table);
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ctx->map_toeplitz_key = bpf_map__fd(
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rss_bpf_ctx->maps.tap_rss_map_toeplitz_key);
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return true;
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error:
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rss_bpf__destroy(rss_bpf_ctx);
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ctx->obj = NULL;
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return false;
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}
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static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
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struct EBPFRSSConfig *config)
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{
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uint32_t map_key = 0;
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if (!ebpf_rss_is_loaded(ctx)) {
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return false;
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}
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if (bpf_map_update_elem(ctx->map_configuration,
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&map_key, config, 0) < 0) {
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return false;
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}
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return true;
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}
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static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx,
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uint16_t *indirections_table,
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size_t len)
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{
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uint32_t i = 0;
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if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL ||
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len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
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return false;
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}
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for (; i < len; ++i) {
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if (bpf_map_update_elem(ctx->map_indirections_table, &i,
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indirections_table + i, 0) < 0) {
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return false;
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}
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}
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return true;
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}
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static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx,
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uint8_t *toeplitz_key)
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{
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uint32_t map_key = 0;
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/* prepare toeplitz key */
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uint8_t toe[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {};
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if (!ebpf_rss_is_loaded(ctx) || toeplitz_key == NULL) {
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return false;
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}
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memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_MAX_KEY_SIZE);
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*(uint32_t *)toe = ntohl(*(uint32_t *)toe);
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if (bpf_map_update_elem(ctx->map_toeplitz_key, &map_key, toe,
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0) < 0) {
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return false;
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}
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return true;
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}
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bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
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uint16_t *indirections_table, uint8_t *toeplitz_key)
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{
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if (!ebpf_rss_is_loaded(ctx) || config == NULL ||
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indirections_table == NULL || toeplitz_key == NULL) {
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return false;
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}
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if (!ebpf_rss_set_config(ctx, config)) {
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return false;
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}
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if (!ebpf_rss_set_indirections_table(ctx, indirections_table,
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config->indirections_len)) {
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return false;
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}
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if (!ebpf_rss_set_toepliz_key(ctx, toeplitz_key)) {
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return false;
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}
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return true;
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}
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void ebpf_rss_unload(struct EBPFRSSContext *ctx)
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{
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if (!ebpf_rss_is_loaded(ctx)) {
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return;
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}
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rss_bpf__destroy(ctx->obj);
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ctx->obj = NULL;
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}
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