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Tsirkin" , Stefano Garzarella , Cornelia Huck , Luigi Rizzo , Giuseppe Lettieri , Vincenzo Maffione , Eric Blake , Markus Armbruster Subject: [PATCH RFC v3 11/13] virtio-net: implement extended features support Date: Fri, 18 Jul 2025 10:52:37 +0200 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pabeni@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1752828989085116600 Content-Type: text/plain; charset="utf-8" Use the extended types and helpers to manipulate the virtio_net features. Note that offloads are still 64bits wide, as per specification, and extended offloads will be mapped into such range. Signed-off-by: Paolo Abeni --- v2 -> v3: - rebased on top of 2deec9ab7d ("virtio-net: Move virtio_net_get_features() down") - _array -> _ex v1 -> v2: - uint128_t -> uint64_t[] - more verbose macro definitions --- hw/net/virtio-net.c | 136 +++++++++++++++++++-------------- include/hw/virtio/virtio-net.h | 2 +- 2 files changed, 80 insertions(+), 58 deletions(-) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 8953c329e7..53413ec4d5 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -90,6 +90,19 @@ VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |= \ VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) =20 +/* + * Features starting from VIRTIO_NET_FEATURES_MAP_MIN bit correspond + * to guest offloads in the VIRTIO_NET_OFFLOAD_MAP range + */ +#define VIRTIO_NET_OFFLOAD_MAP_MIN 46 +#define VIRTIO_NET_OFFLOAD_MAP_LENGTH 4 +#define VIRTIO_NET_OFFLOAD_MAP MAKE_64BIT_MASK( \ + VIRTIO_NET_OFFLOAD_MAP_MIN, \ + VIRTIO_NET_OFFLOAD_MAP_LENGT= H) +#define VIRTIO_NET_FEATURES_MAP_MIN 65 +#define VIRTIO_NET_F2O_SHIFT (VIRTIO_NET_OFFLOAD_MAP_MIN - \ + VIRTIO_NET_FEATURES_MAP_MIN + 64) + static const VirtIOFeature feature_sizes[] =3D { {.flags =3D 1ULL << VIRTIO_NET_F_MAC, .end =3D endof(struct virtio_net_config, mac)}, @@ -786,7 +799,14 @@ static void virtio_net_apply_guest_offloads(VirtIONet = *n) qemu_set_offload(qemu_get_queue(n->nic)->peer, &ol); } =20 -static uint64_t virtio_net_guest_offloads_by_features(uint64_t features) +static uint64_t virtio_net_features_to_offload(const uint64_t *features) +{ + return (features[0] & ~VIRTIO_NET_OFFLOAD_MAP) | + ((features[1] << VIRTIO_NET_F2O_SHIFT) & VIRTIO_NET_OFFLOAD_MAP= ); +} + +static uint64_t +virtio_net_guest_offloads_by_features(const uint64_t *features) { static const uint64_t guest_offloads_mask =3D (1ULL << VIRTIO_NET_F_GUEST_CSUM) | @@ -797,13 +817,13 @@ static uint64_t virtio_net_guest_offloads_by_features= (uint64_t features) (1ULL << VIRTIO_NET_F_GUEST_USO4) | (1ULL << VIRTIO_NET_F_GUEST_USO6); =20 - return guest_offloads_mask & features; + return guest_offloads_mask & virtio_net_features_to_offload(features); } =20 uint64_t virtio_net_supported_guest_offloads(const VirtIONet *n) { VirtIODevice *vdev =3D VIRTIO_DEVICE(n); - return virtio_net_guest_offloads_by_features(vdev->guest_features); + return virtio_net_guest_offloads_by_features(vdev->guest_features_ex); } =20 typedef struct { @@ -882,34 +902,39 @@ static void failover_add_primary(VirtIONet *n, Error = **errp) error_propagate(errp, err); } =20 -static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) +static void virtio_net_set_features(VirtIODevice *vdev, + const uint64_t *in_features) { + uint64_t features[VIRTIO_FEATURES_DWORDS]; VirtIONet *n =3D VIRTIO_NET(vdev); Error *err =3D NULL; int i; =20 + virtio_features_copy(features, in_features); if (n->mtu_bypass_backend && !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU))= { - features &=3D ~(1ULL << VIRTIO_NET_F_MTU); + virtio_clear_feature_ex(features, VIRTIO_NET_F_MTU); } =20 virtio_net_set_multiqueue(n, - virtio_has_feature(features, VIRTIO_NET_F_RS= S) || - virtio_has_feature(features, VIRTIO_NET_F_MQ= )); + virtio_has_feature_ex(features, + VIRTIO_NET_F_RSS) || + virtio_has_feature_ex(features, + VIRTIO_NET_F_MQ)); =20 virtio_net_set_mrg_rx_bufs(n, - virtio_has_feature(features, + virtio_has_feature_ex(features, VIRTIO_NET_F_MRG_RXBUF), - virtio_has_feature(features, + virtio_has_feature_ex(features, VIRTIO_F_VERSION_1), - virtio_has_feature(features, + virtio_has_feature_ex(features, VIRTIO_NET_F_HASH_REPORT= )); =20 - n->rsc4_enabled =3D virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT)= && - virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO4); - n->rsc6_enabled =3D virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT)= && - virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO6); - n->rss_data.redirect =3D virtio_has_feature(features, VIRTIO_NET_F_RSS= ); + n->rsc4_enabled =3D virtio_has_feature_ex(features, VIRTIO_NET_F_RSC_E= XT) && + virtio_has_feature_ex(features, VIRTIO_NET_F_GUEST_TSO4); + n->rsc6_enabled =3D virtio_has_feature_ex(features, VIRTIO_NET_F_RSC_E= XT) && + virtio_has_feature_ex(features, VIRTIO_NET_F_GUEST_TSO6); + n->rss_data.redirect =3D virtio_has_feature_ex(features, VIRTIO_NET_F_= RSS); =20 if (n->has_vnet_hdr) { n->curr_guest_offloads =3D @@ -923,7 +948,7 @@ static void virtio_net_set_features(VirtIODevice *vdev,= uint64_t features) if (!get_vhost_net(nc->peer)) { continue; } - vhost_net_ack_features(get_vhost_net(nc->peer), features); + vhost_net_ack_features_ex(get_vhost_net(nc->peer), features); =20 /* * keep acked_features in NetVhostUserState up-to-date so it @@ -932,11 +957,11 @@ static void virtio_net_set_features(VirtIODevice *vde= v, uint64_t features) vhost_net_save_acked_features(nc->peer); } =20 - if (!virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { + if (!virtio_has_feature_ex(features, VIRTIO_NET_F_CTRL_VLAN)) { memset(n->vlans, 0xff, MAX_VLAN >> 3); } =20 - if (virtio_has_feature(features, VIRTIO_NET_F_STANDBY)) { + if (virtio_has_feature_ex(features, VIRTIO_NET_F_STANDBY)) { qapi_event_send_failover_negotiated(n->netclient_name); qatomic_set(&n->failover_primary_hidden, false); failover_add_primary(n, &err); @@ -1901,10 +1926,10 @@ static ssize_t virtio_net_receive_rcu(NetClientStat= e *nc, const uint8_t *buf, virtio_error(vdev, "virtio-net unexpected empty queue: " "i %zd mergeable %d offset %zd, size %zd, " "guest hdr len %zd, host hdr len %zd " - "guest features 0x%" PRIx64, + "guest features 0x" VIRTIO_FEATURES_FMT, i, n->mergeable_rx_bufs, offset, size, n->guest_hdr_len, n->host_hdr_len, - vdev->guest_features); + VIRTIO_FEATURES_PR(vdev->guest_features_ex)); } err =3D -1; goto err; @@ -3011,8 +3036,8 @@ static int virtio_net_pre_load_queues(VirtIODevice *v= dev, uint32_t n) return 0; } =20 -static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t featu= res, - Error **errp) +static void virtio_net_get_features(VirtIODevice *vdev, uint64_t *features, + Error **errp) { VirtIONet *n =3D VIRTIO_NET(vdev); NetClientState *nc =3D qemu_get_queue(n->nic); @@ -3026,68 +3051,67 @@ static uint64_t virtio_net_get_features(VirtIODevic= e *vdev, uint64_t features, (supported_hash_types & peer_hash_types) =3D=3D supported_hash_typ= es; =20 /* Firstly sync all virtio-net possible supported features */ - features |=3D n->host_features; + virtio_features_or(features, features, n->host_features_ex); =20 - virtio_add_feature(&features, VIRTIO_NET_F_MAC); + virtio_add_feature_ex(features, VIRTIO_NET_F_MAC); =20 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_ex(features, VIRTIO_NET_F_CSUM); + virtio_clear_feature_ex(features, VIRTIO_NET_F_HOST_TSO4); + virtio_clear_feature_ex(features, VIRTIO_NET_F_HOST_TSO6); + virtio_clear_feature_ex(features, VIRTIO_NET_F_HOST_ECN); =20 - 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_ex(features, VIRTIO_NET_F_GUEST_CSUM); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_TSO4); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_TSO6); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_ECN); =20 - 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_ex(features, VIRTIO_NET_F_HOST_USO); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_USO4); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_USO6); =20 - virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT); + virtio_clear_feature_ex(features, VIRTIO_NET_F_HASH_REPORT); } =20 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); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_UFO); + virtio_clear_feature_ex(features, VIRTIO_NET_F_HOST_UFO); } - 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_ex(features, VIRTIO_NET_F_HOST_USO); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_USO4); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_USO6); } =20 if (!get_vhost_net(nc->peer)) { if (!use_own_hash) { - virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT); - virtio_clear_feature(&features, VIRTIO_NET_F_RSS); - } else if (virtio_has_feature(features, VIRTIO_NET_F_RSS)) { + virtio_clear_feature_ex(features, VIRTIO_NET_F_HASH_REPORT); + virtio_clear_feature_ex(features, VIRTIO_NET_F_RSS); + } else if (virtio_has_feature_ex(features, VIRTIO_NET_F_RSS)) { virtio_net_load_ebpf(n, errp); } =20 - return features; + return; } =20 if (!use_peer_hash) { - virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT); + virtio_clear_feature_ex(features, VIRTIO_NET_F_HASH_REPORT); =20 if (!use_own_hash || !virtio_net_attach_ebpf_to_backend(n->nic, -1= )) { if (!virtio_net_load_ebpf(n, errp)) { - return features; + return; } =20 - virtio_clear_feature(&features, VIRTIO_NET_F_RSS); + virtio_clear_feature_ex(features, VIRTIO_NET_F_RSS); } } =20 - features =3D vhost_net_get_features(get_vhost_net(nc->peer), features); - vdev->backend_features =3D features; + vhost_net_get_features_ex(get_vhost_net(nc->peer), features); + virtio_features_copy(vdev->backend_features_ex, features); =20 if (n->mtu_bypass_backend && (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) { - features |=3D (1ULL << VIRTIO_NET_F_MTU); + virtio_add_feature_ex(features, VIRTIO_NET_F_MTU); } =20 /* @@ -3102,10 +3126,8 @@ static uint64_t virtio_net_get_features(VirtIODevice= *vdev, uint64_t features, * support it. */ if (!virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_CTRL_VQ))= { - virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ANNOUNCE); + virtio_clear_feature_ex(features, VIRTIO_NET_F_GUEST_ANNOUNCE); } - - return features; } =20 static int virtio_net_post_load_device(void *opaque, int version_id) @@ -4237,8 +4259,8 @@ static void virtio_net_class_init(ObjectClass *klass,= const void *data) vdc->unrealize =3D virtio_net_device_unrealize; vdc->get_config =3D virtio_net_get_config; vdc->set_config =3D virtio_net_set_config; - vdc->get_features =3D virtio_net_get_features; - vdc->set_features =3D virtio_net_set_features; + vdc->get_features_ex =3D virtio_net_get_features; + vdc->set_features_ex =3D virtio_net_set_features; vdc->bad_features =3D virtio_net_bad_features; vdc->reset =3D virtio_net_reset; vdc->queue_reset =3D virtio_net_queue_reset; diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h index 73fdefc0dc..5b8ab7bda7 100644 --- a/include/hw/virtio/virtio-net.h +++ b/include/hw/virtio/virtio-net.h @@ -182,7 +182,7 @@ struct VirtIONet { uint32_t has_vnet_hdr; size_t host_hdr_len; size_t guest_hdr_len; - uint64_t host_features; + VIRTIO_DECLARE_FEATURES(host_features); uint32_t rsc_timeout; uint8_t rsc4_enabled; uint8_t rsc6_enabled; --=20 2.50.0