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[88.4.146.217]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4bb4e2adf53sm151135805e9.15.2026.11.13.04.49.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Nov 2026 04:49:49 -0800 (PST) From: Sergio Lopez Date: Fri, 13 Nov 2026 13:47:36 +0100 Subject: [PATCH RFC v2 3/8] vsock/virtio: implement the datagram data path X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Message-Id: <20261113-vsock-dgram-support-v2-3-bacfc85b71ce@redhat.com> References: <20261113-vsock-dgram-support-v2-0-bacfc85b71ce@redhat.com> In-Reply-To: <20261113-vsock-dgram-support-v2-0-bacfc85b71ce@redhat.com> To: Stefano Garzarella , Bobby Eshleman , Alexei Starovoitov , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Bryan Tan , Vishnu Dasa , Broadcom internal kernel review list , Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , =?utf-8?q?Eugenio_P=C3=A9rez?= , Xuan Zhuo , Haiyang Zhang , Wei Liu , Dexuan Cui , Shuah Khan , Randy Dunlap Cc: virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org, linux-hyperv@vger.kernel.org, Jonathan Corbet , linux-doc@vger.kernel.org, Sergio Lopez X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=11186; i=slp@redhat.com; h=from:subject:message-id; bh=HDuvzaYHkUWJ5X9Jj1YzuMXhUH5TfX/ACn0pbY3JQnw=; b=owEBbAKT/ZANAwAKAfRpJ40vDAI1AcsmYgBq9wddjFFSvO+d3lalnHF/Z1FlIyhT1qv0H8o3e taGkI2mXn6JAjIEAAEKAB0WIQS+1fz3US2GgJFC6KL0aSeNLwwCNQUCavcHXQAKCRD0aSeNLwwC NVCcD/Y5I8YcmuN1HwwP8pA3bIC6IP1/96SDZDZ+mFkNMtaY2+QvQKzdVmAKjCqUeHSpZeXBQKU fFxUDLPY5yAaY1TLxUPBe3prQYTV9rajFbogdOfFViXIltDUI54zDTH2Ixc0XAGWbxcz2AWKxkT b4RAnD2fef+R5Jo2T+fQKjyVtZgCXXHt1eFzU1Dcfhq7rnvVpunNBXPgCzWCzeIoANicw4/3lUt 56695Yybl5axSp5i1xs7peu4dK+MAoDKAFuOeH3YpEmzFNtHH2Xtko93oBCWTG7z7f43HB7BTwk ahwt4sSvrD7PYTlAoEwO8jrdEGeWcg3oibzx2t1ThTFeRs7wtu+guiS3II70PJeIL7PwxSF15of HiWN5GdqfCr454jvIIpOaqvVymvILOTQ4bm5LqNWKWPXMemZ40zGA4nEKBymRPdjYXvBCUKiVXV OEblV/dJYV1+nNlyWKGajlnFDnYoPEx/ENSqlNqo6w+orfQnXwCs0/EuhaWgwY5YtheJk/SfUSG 5zHGevZH7mZeghD8Lv1Ruw0TZ365uIYQO8q4gLNPzkiAdN5p7o1urZNGGM9fDP1f7xfAsrKhjeM 7qGxcKBQUqjkoX9ipLvOPyhwIIGOsfMeB4IQ9Pj/ZHGH8XHa86+k4E1i3fP7tgHi+y3hjO2NOip ni2YHzRVipIXX X-Developer-Key: i=slp@redhat.com; a=openpgp; fpr=BED5FCF7512D86809142E8A2F469278D2F0C0235 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: BWTh6-PPHPD7tqpJpKMONUEh7sCojqfuFD-dsovZPU8_1794574192 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Add the datagram feature bit and packet type, and implement the common virtio transport operations needed to bind, send, and receive datagrams. Send each message as an OP_RW packet with a maximum 64 KiB payload, including support for empty messages. Bound pending sends by the socket send buffer instead of connection-oriented peer credits. Use the socket's skb memory charge for datagram SIOCOUTQ, including empty messages, and release it through the normal skb ownership lifetime on completion, rejection, or queued drops. Deliver incoming datagrams through the datagram bound-socket lookup without entering the connection state machine. Connection-oriented receive lookup excludes datagram sockets, so each class can use the same destination CID and port. Validate the transport and connected peer under the socket lock, including after shutdown, and silently discard undeliverable messages. Use the socket datagram queue for recvmsg(), including source addresses, peeking, and truncation reporting based on the payload length after socket filtering. Reject MSG_OOB and MSG_ERRQUEUE before accessing the receive queue. Reject datagram sockmap admission until its receive callbacks support it. Signed-off-by: Sergio Lopez --- include/uapi/linux/virtio_vsock.h | 2 + net/vmw_vsock/af_vsock.c | 31 +++++--- net/vmw_vsock/virtio_transport_common.c | 132 ++++++++++++++++++++++++++++---- net/vmw_vsock/vsock_bpf.c | 3 +- 4 files changed, 140 insertions(+), 28 deletions(-) diff --git a/include/uapi/linux/virtio_vsock.h b/include/uapi/linux/virtio_vsock.h index 64738838bee5..27b4b2b8bf13 100644 --- a/include/uapi/linux/virtio_vsock.h +++ b/include/uapi/linux/virtio_vsock.h @@ -40,6 +40,7 @@ /* The feature bitmap for virtio vsock */ #define VIRTIO_VSOCK_F_SEQPACKET 1 /* SOCK_SEQPACKET supported */ +#define VIRTIO_VSOCK_F_DGRAM 3 /* SOCK_DGRAM supported */ struct virtio_vsock_config { __le64 guest_cid; @@ -69,6 +70,7 @@ struct virtio_vsock_hdr { enum virtio_vsock_type { VIRTIO_VSOCK_TYPE_STREAM = 1, VIRTIO_VSOCK_TYPE_SEQPACKET = 2, + VIRTIO_VSOCK_TYPE_DGRAM = 3, }; enum virtio_vsock_op { diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 8a271eb66860..aef5389eeca2 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1659,20 +1659,27 @@ static int vsock_do_ioctl(struct socket *sock, unsigned int cmd, case SIOCOUTQ: { ssize_t n_bytes; - if (!vsk->transport || !vsk->transport->unsent_bytes) { - ret = -EOPNOTSUPP; - break; - } + if (sk->sk_type == SOCK_DGRAM) { + /* Match UDP: report charged send memory, including skb + * overhead and empty datagrams. + */ + n_bytes = sk_wmem_alloc_get(sk); + } else { + if (!vsk->transport || !vsk->transport->unsent_bytes) { + ret = -EOPNOTSUPP; + break; + } - if (sock_type_connectible(sk->sk_type) && sk->sk_state == TCP_LISTEN) { - ret = -EINVAL; - break; - } + if (sk->sk_state == TCP_LISTEN) { + ret = -EINVAL; + break; + } - n_bytes = vsk->transport->unsent_bytes(vsk); - if (n_bytes < 0) { - ret = n_bytes; - break; + n_bytes = vsk->transport->unsent_bytes(vsk); + if (n_bytes < 0) { + ret = n_bytes; + break; + } } ret = put_user(n_bytes, arg); diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index 1e762a480df4..08baa1181ba6 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -204,6 +204,8 @@ static u16 virtio_transport_get_type(struct sock *sk) { if (sk->sk_type == SOCK_STREAM) return VIRTIO_VSOCK_TYPE_STREAM; + else if (sk->sk_type == SOCK_DGRAM) + return VIRTIO_VSOCK_TYPE_DGRAM; else return VIRTIO_VSOCK_TYPE_SEQPACKET; } @@ -303,6 +305,7 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk, u32 src_cid, src_port, dst_cid, dst_port; const struct virtio_transport *t_ops; struct iov_iter_state msg_iter_state; + struct sock *sk = sk_vsock(vsk); struct virtio_vsock_sock *vvs; struct ubuf_info *uarg = NULL; u32 pkt_len = info->pkt_len; @@ -327,14 +330,27 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk, dst_port = info->remote_port; } - vvs = vsk->trans; + /* Datagram sends use socket memory accounting instead of peer credits. */ + vvs = info->type == VIRTIO_VSOCK_TYPE_DGRAM ? NULL : vsk->trans; - /* virtio_transport_get_credit might return less than pkt_len credit */ - pkt_len = virtio_transport_get_credit(vvs, pkt_len); + if (info->type == VIRTIO_VSOCK_TYPE_DGRAM) { + if (pkt_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) + return -EMSGSIZE; - /* Do not send zero length OP_RW pkt */ - if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW) - return pkt_len; + /* Datagram sends are serialized by the socket lock. */ + if (sk_wmem_alloc_get(sk) >= READ_ONCE(sk->sk_sndbuf)) { + sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); + set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); + return -EAGAIN; + } + } else { + /* virtio_transport_get_credit might return less than pkt_len credit */ + pkt_len = virtio_transport_get_credit(vvs, pkt_len); + + /* Do not send zero length OP_RW pkt */ + if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW) + return pkt_len; + } if (info->msg && (info->msg->msg_flags & MSG_ZEROCOPY)) { /* If 'info->msg' is not NULL, this is only VIRTIO_VSOCK_OP_RW. @@ -348,7 +364,8 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk, uarg = msg_zerocopy_realloc(sk_vsock(vsk), pkt_len, NULL, false); if (!uarg) { - virtio_transport_put_credit(vvs, pkt_len); + if (info->type != VIRTIO_VSOCK_TYPE_DGRAM) + virtio_transport_put_credit(vvs, pkt_len); return -ENOMEM; } @@ -393,7 +410,8 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk, break; } - virtio_transport_inc_tx_pkt(vvs, skb); + if (info->type != VIRTIO_VSOCK_TYPE_DGRAM) + virtio_transport_inc_tx_pkt(vvs, skb); ret = t_ops->send_pkt(skb, info->net); if (ret < 0) @@ -416,7 +434,8 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk, if (info->msg && ret < 0) iov_iter_restore(&info->msg->msg_iter, &msg_iter_state); - virtio_transport_put_credit(vvs, rest_len); + if (info->type != VIRTIO_VSOCK_TYPE_DGRAM) + virtio_transport_put_credit(vvs, rest_len); /* msg_zerocopy_realloc() initializes the ubuf_info refcnt to 1. * skb_zcopy_set() increases it for each skb, so we can drop that @@ -620,7 +639,7 @@ void virtio_transport_consume_skb_sent(struct sk_buff *skb, bool consume) { struct sock *s = skb->sk; - if (s && skb->len) { + if (s && skb->len && s->sk_type != SOCK_DGRAM) { struct vsock_sock *vs = vsock_sk(s); struct virtio_vsock_sock *vvs; @@ -999,7 +1018,47 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk, struct msghdr *msg, size_t len, int flags) { - return -EOPNOTSUPP; + struct sock *sk = sk_vsock(vsk); + struct virtio_vsock_hdr *hdr; + struct sk_buff *skb; + size_t payload_len; + int err; + + if (flags & (MSG_OOB | MSG_ERRQUEUE)) + return -EOPNOTSUPP; + + skb = skb_recv_datagram(sk, flags, &err); + if (!skb) + return err; + + hdr = virtio_vsock_hdr(skb); + payload_len = skb->len; + + if (payload_len > len) { + payload_len = len; + msg->msg_flags |= MSG_TRUNC; + } + + err = skb_copy_datagram_iter(skb, 0, &msg->msg_iter, payload_len); + if (err) + goto out; + + if (msg->msg_name) { + DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name); + + vsock_addr_init(vm_addr, le64_to_cpu(hdr->src_cid), + le32_to_cpu(hdr->src_port)); + msg->msg_namelen = sizeof(*vm_addr); + } + + if (flags & MSG_TRUNC) + err = skb->len; + else + err = payload_len; + +out: + skb_free_datagram(sk, skb); + return err; } EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue); @@ -1202,13 +1261,13 @@ EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active); int virtio_transport_dgram_bind(struct vsock_sock *vsk, struct sockaddr_vm *addr) { - return -EOPNOTSUPP; + return vsock_bind_common(vsk, addr); } EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind); bool virtio_transport_dgram_allow(struct vsock_sock *vsk, u32 cid, u32 port) { - return false; + return true; } EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow); @@ -1246,7 +1305,17 @@ virtio_transport_dgram_enqueue(struct vsock_sock *vsk, struct msghdr *msg, size_t dgram_len) { - return -EOPNOTSUPP; + struct virtio_vsock_pkt_info info = { + .op = VIRTIO_VSOCK_OP_RW, + .msg = msg, + .pkt_len = dgram_len, + .vsk = vsk, + .remote_cid = remote_addr->svm_cid, + .remote_port = remote_addr->svm_port, + .net = sock_net(sk_vsock(vsk)), + }; + + return virtio_transport_send_pkt_info(vsk, &info); } EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue); @@ -1771,7 +1840,8 @@ virtio_transport_recv_listen(struct sock *sk, struct sk_buff *skb, static bool virtio_transport_valid_type(u16 type) { return (type == VIRTIO_VSOCK_TYPE_STREAM) || - (type == VIRTIO_VSOCK_TYPE_SEQPACKET); + (type == VIRTIO_VSOCK_TYPE_SEQPACKET) || + (type == VIRTIO_VSOCK_TYPE_DGRAM); } /* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex @@ -1805,6 +1875,38 @@ void virtio_transport_recv_pkt(struct virtio_transport *t, goto free_pkt; } + /* Dgram packets are delivered directly to bound sockets without + * going through the connection state machine. Undeliverable + * datagrams are silently dropped (no RST). + */ + if (le16_to_cpu(hdr->type) == VIRTIO_VSOCK_TYPE_DGRAM) { + if (le16_to_cpu(hdr->op) != VIRTIO_VSOCK_OP_RW) + goto free_pkt; + + sk = vsock_find_bound_dgram_socket_net(&dst, net); + + if (!sk) + goto free_pkt; + + vsk = vsock_sk(sk); + lock_sock(sk); + if (sock_flag(sk, SOCK_DEAD) || + vsk->transport != &t->transport || + (sk->sk_socket->state != SS_UNCONNECTED && + !vsock_check_source(vsk, &t->transport, &src))) { + release_sock(sk); + sock_put(sk); + goto free_pkt; + } + + if (sock_queue_rcv_skb(sk, skb)) + kfree_skb(skb); + + release_sock(sk); + sock_put(sk); + return; + } + /* The socket must be in connected or bound table * otherwise send reset back */ diff --git a/net/vmw_vsock/vsock_bpf.c b/net/vmw_vsock/vsock_bpf.c index 9049d2648646..296e1fa7970b 100644 --- a/net/vmw_vsock/vsock_bpf.c +++ b/net/vmw_vsock/vsock_bpf.c @@ -161,7 +161,8 @@ int vsock_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore if (!vsk->transport) return -ENODEV; - if (!vsk->transport->read_skb) + /* Datagram receive is not implemented by the sockmap callbacks. */ + if (sk->sk_type == SOCK_DGRAM || !vsk->transport->read_skb) return -EOPNOTSUPP; vsock_bpf_check_needs_rebuild(psock->sk_proto); -- 2.56.0