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ebpf: Added eBPF initialization by fds.

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It allows using file descriptors of eBPF provided
outside of QEMU.
QEMU may be run without capabilities for eBPF and run
RSS program provided by management tool(g.e. libvirt).

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Andrew Melnychenko 2024-02-05 18:54:32 +02:00 committed by Jason Wang
parent 333b3e5fab
commit 0524ea0510
3 changed files with 38 additions and 0 deletions
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6
ebpf/ebpf_rss-stub.c
View File

@ -28,6 +28,12 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
return false; return false;
} }
bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
int config_fd, int toeplitz_fd, int table_fd)
{
return false;
}
bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config, bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
uint16_t *indirections_table, uint8_t *toeplitz_key) uint16_t *indirections_table, uint8_t *toeplitz_key)
{ {

27
ebpf/ebpf_rss.c
View File

@ -146,6 +146,33 @@ error:
return false; return false;
} }
bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
int config_fd, int toeplitz_fd, int table_fd)
{
if (ebpf_rss_is_loaded(ctx)) {
return false;
}
if (program_fd < 0 || config_fd < 0 || toeplitz_fd < 0 || table_fd < 0) {
return false;
}
ctx->program_fd = program_fd;
ctx->map_configuration = config_fd;
ctx->map_toeplitz_key = toeplitz_fd;
ctx->map_indirections_table = table_fd;
if (!ebpf_rss_mmap(ctx)) {
ctx->program_fd = -1;
ctx->map_configuration = -1;
ctx->map_toeplitz_key = -1;
ctx->map_indirections_table = -1;
return false;
}
return true;
}
static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx, static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
struct EBPFRSSConfig *config) struct EBPFRSSConfig *config)
{ {

5
ebpf/ebpf_rss.h
View File

@ -14,6 +14,8 @@
#ifndef QEMU_EBPF_RSS_H #ifndef QEMU_EBPF_RSS_H
#define QEMU_EBPF_RSS_H #define QEMU_EBPF_RSS_H
#define EBPF_RSS_MAX_FDS 4
struct EBPFRSSContext { struct EBPFRSSContext {
void *obj; void *obj;
int program_fd; int program_fd;
@ -41,6 +43,9 @@ bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx);
bool ebpf_rss_load(struct EBPFRSSContext *ctx); bool ebpf_rss_load(struct EBPFRSSContext *ctx);
bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
int config_fd, int toeplitz_fd, int table_fd);
bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config, bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
uint16_t *indirections_table, uint8_t *toeplitz_key); uint16_t *indirections_table, uint8_t *toeplitz_key);