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virtio-net: Added property to load eBPF RSS with fds.

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eBPF RSS program and maps may now be passed during initialization.
Initially was implemented for libvirt to launch qemu without permissions,
and initialized eBPF program through the helper.

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 18:54:33 +02:00 • committed by Jason Wang
parent 0524ea0510
commit 6b230b7dfc
2 changed files with 50 additions and 6 deletions
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54
hw/net/virtio-net.c
View file

@ -42,6 +42,7 @@
#include "sysemu/sysemu.h"
#include "trace.h"
#include "monitor/qdev.h"
#include "monitor/monitor.h"
#include "hw/pci/pci_device.h"
#include "net_rx_pkt.h"
#include "hw/virtio/vhost.h"
@ -1328,14 +1329,53 @@ 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)
static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
{
if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
/* backend doesn't support steering ebpf */
return false;
int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
int ret = true;
int i = 0;
ERRP_GUARD();
if (n->nr_ebpf_rss_fds != EBPF_RSS_MAX_FDS) {
error_setg(errp,
"Expected %d file descriptors but got %d",
EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds);
return false;
}
for (i = 0; i < n->nr_ebpf_rss_fds; i++) {
fds[i] = monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i], errp);
if (*errp) {
ret = false;
goto exit;
}
}
return ebpf_rss_load(&n->ebpf_rss);
ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
exit:
if (!ret || *errp) {
for (i = 0; i < n->nr_ebpf_rss_fds && fds[i] != -1; i++) {
close(fds[i]);
}
}
return ret;
}
static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
{
bool ret = false;
if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
if (!(n->ebpf_rss_fds
&& virtio_net_load_ebpf_fds(n, errp))) {
ret = ebpf_rss_load(&n->ebpf_rss);
}
}
return ret;
}
static void virtio_net_unload_ebpf(VirtIONet *n)
@ -3768,7 +3808,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
net_rx_pkt_init(&n->rx_pkt);
if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
virtio_net_load_ebpf(n);
virtio_net_load_ebpf(n, errp);
}
}
@ -3930,6 +3970,8 @@ static Property virtio_net_properties[] = {
VIRTIO_NET_F_RSS, false),
DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
VIRTIO_NET_F_HASH_REPORT, false),
DEFINE_PROP_ARRAY("ebpf-rss-fds", VirtIONet, nr_ebpf_rss_fds,
ebpf_rss_fds, qdev_prop_string, char*),
DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
VIRTIO_NET_F_RSC_EXT, false),
DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,