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[PATCH v4 1/2] virtio-net: Convert feature properties to OnOffAuto
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From: |
Akihiko Odaki |
|
Subject: |
[PATCH v4 1/2] virtio-net: Convert feature properties to OnOffAuto |
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Date: |
Sat, 04 Jan 2025 16:48:53 +0900 |
Some features are not always available, and virtio-net used to disable
them when not available even if the corresponding properties were
explicitly set to "on".
Convert feature properties to OnOffAuto so that the user can explicitly
tell QEMU to automatically select the value by setting them "auto".
QEMU will give an error if they are set "on".
Convert "on" to "auto" when using an old machine for compatbility.
VIRTIO_NET_F_HASH_REPORT and VIRTIO_NET_F_RSS are exceptional and not
converted to "auto" if the peer is not vhost because they were
previously forcibly enabled even if they were not supported by the
peer and required the in-QEMU implementation, which incurred overhead.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
include/hw/virtio/virtio-net.h | 3 +-
hw/core/machine.c | 1 +
hw/net/virtio-net.c | 261 ++++++++++++++++++++++++++---------------
3 files changed, 169 insertions(+), 96 deletions(-)
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index b9ea9e824e3c..d41f042d4e2f 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -178,7 +178,7 @@ struct VirtIONet {
uint32_t has_vnet_hdr;
size_t host_hdr_len;
size_t guest_hdr_len;
- uint64_t host_features;
+ OnOffAutoBit64 host_features;
uint32_t rsc_timeout;
uint8_t rsc4_enabled;
uint8_t rsc6_enabled;
@@ -218,6 +218,7 @@ struct VirtIONet {
/* primary failover device is hidden*/
bool failover_primary_hidden;
bool failover;
+ bool force_features_auto;
DeviceListener primary_listener;
QDict *primary_opts;
bool primary_opts_from_json;
diff --git a/hw/core/machine.c b/hw/core/machine.c
index bff26b95dd74..1b4435fc1a64 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -38,6 +38,7 @@
GlobalProperty hw_compat_9_2[] = {
{ TYPE_VIRTIO_DEVICE, "x-force-features-auto", "on" },
+ { TYPE_VIRTIO_NET, "x-force-virtio-net-features-auto", "on" },
};
const size_t hw_compat_9_2_len = G_N_ELEMENTS(hw_compat_9_2);
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 06f096abf678..6b2104c6b68d 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -751,58 +751,110 @@ static void virtio_net_set_queue_pairs(VirtIONet *n)
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
+static bool virtio_net_clear_features(OnOffAutoBit64 *features,
+ uint64_t clear_bits,
+ const char *reason, Error **errp)
+{
+ if (features->on_bits & clear_bits) {
+ error_setg(errp, "%s", reason);
+ return false;
+ }
+
+ features->auto_bits &= ~clear_bits;
+
+ return true;
+}
+
static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
Error **errp)
{
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_queue(n->nic);
-
- /* Firstly sync all virtio-net possible supported features */
- features |= n->host_features;
-
- virtio_add_feature(&features, VIRTIO_NET_F_MAC);
-
- if (!peer_has_vnet_hdr(n)) {
- virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
- virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
- virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
- virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
-
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
-
- virtio_clear_feature(&features, VIRTIO_NET_F_HOST_USO);
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO4);
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO6);
-
- virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT);
+ OnOffAutoBit64 on_off_auto_features = n->host_features;
+
+ if (n->force_features_auto) {
+ on_off_auto_features.auto_bits |= on_off_auto_features.on_bits;
+ on_off_auto_features.on_bits =
+ get_vhost_net(nc->peer) ?
+ 0 :
+ on_off_auto_features.on_bits &
+ (BIT_ULL(VIRTIO_NET_F_HASH_REPORT) | BIT_ULL(VIRTIO_NET_F_RSS));
+ }
+
+ on_off_auto_features.auto_bits |= features;
+ virtio_add_feature(&on_off_auto_features.auto_bits, VIRTIO_NET_F_MAC);
+
+ if (!((peer_has_vnet_hdr(n) ||
+ virtio_net_clear_features(&on_off_auto_features,
+ BIT_ULL(VIRTIO_NET_F_CSUM) |
+ BIT_ULL(VIRTIO_NET_F_HOST_TSO4) |
+ BIT_ULL(VIRTIO_NET_F_HOST_TSO6) |
+ BIT_ULL(VIRTIO_NET_F_HOST_ECN) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_UFO) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_ECN) |
+ BIT_ULL(VIRTIO_NET_F_HOST_UFO) |
+ BIT_ULL(VIRTIO_NET_F_HOST_USO) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_USO4) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_USO6) |
+ BIT_ULL(VIRTIO_NET_F_HASH_REPORT),
+ "A requested feature requires the peer to
support virtio-net headers.",
+ errp)) &&
+ (peer_has_ufo(n) ||
+ virtio_net_clear_features(&on_off_auto_features,
+ BIT_ULL(VIRTIO_NET_F_GUEST_UFO) |
+ BIT_ULL(VIRTIO_NET_F_HOST_UFO),
+ "UFO is on but the peer does not support
it.",
+ errp)) &&
+ (peer_has_uso(n) ||
+ virtio_net_clear_features(&on_off_auto_features,
+ BIT_ULL(VIRTIO_NET_F_HOST_USO) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_USO4) |
+ BIT_ULL(VIRTIO_NET_F_GUEST_USO6),
+ "USO is on but the peer does not support
it.",
+ errp)) &&
+ (virtio_has_feature(on_off_auto_features.on_bits |
+ on_off_auto_features.auto_bits,
+ VIRTIO_NET_F_CTRL_VQ) ||
+ virtio_net_clear_features(&on_off_auto_features,
+ BIT_ULL(VIRTIO_NET_F_GUEST_ANNOUNCE),
+ "guest_announce is on but ctrl_vq is
off.",
+ errp)))) {
+ return 0;
}
- if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
- virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
- }
+ if (!get_vhost_net(nc->peer)) {
+ if (virtio_has_feature(on_off_auto_features.on_bits,
VIRTIO_NET_F_HASH_REPORT) ||
+ (virtio_has_feature(on_off_auto_features.on_bits,
VIRTIO_NET_F_RSS) &&
+ !ebpf_rss_is_loaded(&n->ebpf_rss))) {
+ virtio_clear_feature(&on_off_auto_features.auto_bits,
+ VIRTIO_NET_F_RSS);
+ }
- if (!peer_has_uso(n)) {
- virtio_clear_feature(&features, VIRTIO_NET_F_HOST_USO);
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO4);
- virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO6);
- }
+ virtio_clear_feature(&on_off_auto_features.auto_bits,
+ VIRTIO_NET_F_HASH_REPORT);
- if (!get_vhost_net(nc->peer)) {
- return features;
+ return on_off_auto_features.on_bits | on_off_auto_features.auto_bits;
}
- if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
- virtio_clear_feature(&features, VIRTIO_NET_F_RSS);
+ if (!ebpf_rss_is_loaded(&n->ebpf_rss) &&
+ !virtio_net_clear_features(&on_off_auto_features,
+ BIT_ULL(VIRTIO_NET_F_RSS),
+ "Both RSS and vhost are on but eBPF is
unavailable; fix eBPF or disable RSS.",
+ errp)) {
+ return 0;
}
- features = vhost_net_get_features(get_vhost_net(nc->peer), features);
+ features = vhost_net_get_features(get_vhost_net(nc->peer),
+ on_off_auto_features.on_bits |
+ on_off_auto_features.auto_bits);
vdev->backend_features = features;
if (n->mtu_bypass_backend &&
- (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) {
+ virtio_has_feature(on_off_auto_features.on_bits |
+ on_off_auto_features.auto_bits,
+ VIRTIO_NET_F_MTU)) {
features |= (1ULL << VIRTIO_NET_F_MTU);
}
@@ -821,6 +873,12 @@ static uint64_t virtio_net_get_features(VirtIODevice
*vdev, uint64_t features,
virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ANNOUNCE);
}
+ if ((features & on_off_auto_features.on_bits) !=
+ on_off_auto_features.on_bits) {
+ error_setg(errp, "A requested feature is incompatible with vhost.");
+ return 0;
+ }
+
return features;
}
@@ -3639,7 +3697,7 @@ static void virtio_net_device_realize(DeviceState *dev,
Error **errp)
int i;
if (n->net_conf.mtu) {
- n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
+ n->host_features.on_bits |= (1ULL << VIRTIO_NET_F_MTU);
}
if (n->net_conf.duplex_str) {
@@ -3651,7 +3709,7 @@ static void virtio_net_device_realize(DeviceState *dev,
Error **errp)
error_setg(errp, "'duplex' must be 'half' or 'full'");
return;
}
- n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
+ n->host_features.on_bits |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
} else {
n->net_conf.duplex = DUPLEX_UNKNOWN;
}
@@ -3661,7 +3719,7 @@ static void virtio_net_device_realize(DeviceState *dev,
Error **errp)
return;
}
if (n->net_conf.speed >= 0) {
- n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
+ n->host_features.on_bits |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
}
if (n->failover) {
@@ -3670,10 +3728,12 @@ static void virtio_net_device_realize(DeviceState *dev,
Error **errp)
device_listener_register(&n->primary_listener);
migration_add_notifier(&n->migration_state,
virtio_net_migration_state_notifier);
- n->host_features |= (1ULL << VIRTIO_NET_F_STANDBY);
+ n->host_features.on_bits |= (1ULL << VIRTIO_NET_F_STANDBY);
}
- virtio_net_set_config_size(n, n->host_features);
+ virtio_net_set_config_size(n,
+ n->host_features.on_bits |
+ n->host_features.auto_bits);
virtio_init(vdev, VIRTIO_ID_NET, n->config_size);
/*
@@ -3800,7 +3860,9 @@ 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)) {
+ if (virtio_has_feature(n->host_features.on_bits |
+ n->host_features.auto_bits,
+ VIRTIO_NET_F_RSS)) {
Error *err = NULL;
if (!virtio_net_load_ebpf(n, &err)) {
/*
@@ -3827,7 +3889,9 @@ static void virtio_net_device_unrealize(DeviceState *dev)
VirtIONet *n = VIRTIO_NET(dev);
int i, max_queue_pairs;
- if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
+ if (virtio_has_feature(n->host_features.on_bits |
+ n->host_features.auto_bits,
+ VIRTIO_NET_F_RSS)) {
virtio_net_unload_ebpf(n);
}
@@ -3986,53 +4050,58 @@ static const VMStateDescription vmstate_virtio_net = {
};
static const Property virtio_net_properties[] = {
- DEFINE_PROP_BIT64("csum", VirtIONet, host_features,
- VIRTIO_NET_F_CSUM, true),
- DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features,
- VIRTIO_NET_F_GUEST_CSUM, true),
- DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
- DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features,
- VIRTIO_NET_F_GUEST_TSO4, true),
- DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features,
- VIRTIO_NET_F_GUEST_TSO6, true),
- DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features,
- VIRTIO_NET_F_GUEST_ECN, true),
- DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features,
- VIRTIO_NET_F_GUEST_UFO, true),
- DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features,
- VIRTIO_NET_F_GUEST_ANNOUNCE, true),
- DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features,
- VIRTIO_NET_F_HOST_TSO4, true),
- DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features,
- VIRTIO_NET_F_HOST_TSO6, true),
- DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features,
- VIRTIO_NET_F_HOST_ECN, true),
- DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features,
- VIRTIO_NET_F_HOST_UFO, true),
- DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features,
- VIRTIO_NET_F_MRG_RXBUF, true),
- DEFINE_PROP_BIT64("status", VirtIONet, host_features,
- VIRTIO_NET_F_STATUS, true),
- DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features,
- VIRTIO_NET_F_CTRL_VQ, true),
- DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features,
- VIRTIO_NET_F_CTRL_RX, true),
- DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features,
- VIRTIO_NET_F_CTRL_VLAN, true),
- DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features,
- VIRTIO_NET_F_CTRL_RX_EXTRA, true),
- DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features,
- VIRTIO_NET_F_CTRL_MAC_ADDR, true),
- DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features,
- VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
- DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
- DEFINE_PROP_BIT64("rss", VirtIONet, host_features,
- VIRTIO_NET_F_RSS, false),
- DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
- VIRTIO_NET_F_HASH_REPORT, false),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("csum", VirtIONet, host_features,
+ VIRTIO_NET_F_CSUM, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("guest_csum", VirtIONet, host_features,
+ VIRTIO_NET_F_GUEST_CSUM, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("gso", VirtIONet, host_features,
+ VIRTIO_NET_F_GSO, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("guest_tso4", VirtIONet, host_features,
+ VIRTIO_NET_F_GUEST_TSO4, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("guest_tso6", VirtIONet, host_features,
+ VIRTIO_NET_F_GUEST_TSO6, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("guest_ecn", VirtIONet, host_features,
+ VIRTIO_NET_F_GUEST_ECN, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("guest_ufo", VirtIONet, host_features,
+ VIRTIO_NET_F_GUEST_UFO, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("guest_announce", VirtIONet, host_features,
+ VIRTIO_NET_F_GUEST_ANNOUNCE,
+ ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("host_tso4", VirtIONet, host_features,
+ VIRTIO_NET_F_HOST_TSO4, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("host_tso6", VirtIONet, host_features,
+ VIRTIO_NET_F_HOST_TSO6, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("host_ecn", VirtIONet, host_features,
+ VIRTIO_NET_F_HOST_ECN, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("host_ufo", VirtIONet, host_features,
+ VIRTIO_NET_F_HOST_UFO, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("mrg_rxbuf", VirtIONet, host_features,
+ VIRTIO_NET_F_MRG_RXBUF, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("status", VirtIONet, host_features,
+ VIRTIO_NET_F_STATUS, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("ctrl_vq", VirtIONet, host_features,
+ VIRTIO_NET_F_CTRL_VQ, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("ctrl_rx", VirtIONet, host_features,
+ VIRTIO_NET_F_CTRL_RX, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("ctrl_vlan", VirtIONet, host_features,
+ VIRTIO_NET_F_CTRL_VLAN, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("ctrl_rx_extra", VirtIONet, host_features,
+ VIRTIO_NET_F_CTRL_RX_EXTRA,
ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("ctrl_mac_addr", VirtIONet, host_features,
+ VIRTIO_NET_F_CTRL_MAC_ADDR,
ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("ctrl_guest_offloads", VirtIONet,
+ host_features,
+ VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,
+ ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("mq", VirtIONet, host_features,
+ VIRTIO_NET_F_MQ, ON_OFF_AUTO_OFF),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("rss", VirtIONet, host_features,
+ VIRTIO_NET_F_RSS, ON_OFF_AUTO_OFF),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("hash", VirtIONet, host_features,
+ VIRTIO_NET_F_HASH_REPORT, ON_OFF_AUTO_OFF),
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,
+ DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features.on_bits,
VIRTIO_NET_F_RSC_EXT, false),
DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
VIRTIO_NET_RSC_DEFAULT_INTERVAL),
@@ -4051,12 +4120,14 @@ static const Property virtio_net_properties[] = {
DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
DEFINE_PROP_BOOL("failover", VirtIONet, failover, false),
- DEFINE_PROP_BIT64("guest_uso4", VirtIONet, host_features,
- VIRTIO_NET_F_GUEST_USO4, true),
- DEFINE_PROP_BIT64("guest_uso6", VirtIONet, host_features,
- VIRTIO_NET_F_GUEST_USO6, true),
- DEFINE_PROP_BIT64("host_uso", VirtIONet, host_features,
- VIRTIO_NET_F_HOST_USO, true),
+ DEFINE_PROP_BOOL("x-force-virtio-net-features-auto", VirtIONet,
+ force_features_auto, false),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("guest_uso4", VirtIONet, host_features,
+ VIRTIO_NET_F_GUEST_USO4, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("guest_uso6", VirtIONet, host_features,
+ VIRTIO_NET_F_GUEST_USO6, ON_OFF_AUTO_AUTO),
+ DEFINE_PROP_ON_OFF_AUTO_BIT64("host_uso", VirtIONet, host_features,
+ VIRTIO_NET_F_HOST_USO, ON_OFF_AUTO_AUTO),
};
static void virtio_net_class_init(ObjectClass *klass, void *data)
--
2.47.1