From patchwork Tue Mar 23 13:12:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arseny Krasnov X-Patchwork-Id: 12157793 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D41B5C433DB for ; Tue, 23 Mar 2021 13:14:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8380861990 for ; Tue, 23 Mar 2021 13:14:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231579AbhCWNN6 (ORCPT ); Tue, 23 Mar 2021 09:13:58 -0400 Received: from mx13.kaspersky-labs.com ([91.103.66.164]:48485 "EHLO mx13.kaspersky-labs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231596AbhCWNNA (ORCPT ); Tue, 23 Mar 2021 09:13:00 -0400 Received: from relay13.kaspersky-labs.com (unknown [127.0.0.10]) by relay13.kaspersky-labs.com (Postfix) with ESMTP id DA203521708; Tue, 23 Mar 2021 16:12:50 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kaspersky.com; s=mail202102; t=1616505171; bh=twlNLFy/EJAoZnNzRrjDMz/nq9lblgdIz7WvKwJpKBo=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=fBx36fkDzCl5v7fjA3SYcjwUGeOUMeucBiowsi3IQThQ5H/ELkQx+txjcSw5aYQFk ELXXZPTZTd6BR4g2Gddz+qmALQ5L4nltPKinnsejcsC6j4S3gofV1yEOk9uFx0sFoe n3ONtQLoNFKthfT8QGG3NRe/T/0y5Z+miRdZqPo0KxOzoc4IpduaM70dLOCiOY7kvy oV8L9byzB90Wt+AL+56f7I8k3vUxCQMuicMJyMRz6WFpjpQxXh56zwoOXKXyJlfEJO FHJ1bZrF6F9AGClLqAWEheRdI+l7UKG718n1Yg0FMXplS6n3P3LGOQk9ep3lt989LP +i0YaeK4hrszw== Received: from mail-hq2.kaspersky.com (unknown [91.103.66.206]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (Client CN "mail-hq2.kaspersky.com", Issuer "Kaspersky MailRelays CA G3" (verified OK)) by mailhub13.kaspersky-labs.com (Postfix) with ESMTPS id 8663D5216D2; Tue, 23 Mar 2021 16:12:50 +0300 (MSK) Received: from arseniy-pc.avp.ru (10.64.68.128) by hqmailmbx3.avp.ru (10.64.67.243) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Tue, 23 Mar 2021 16:12:50 +0300 From: Arseny Krasnov To: Stefan Hajnoczi , Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Jorgen Hansen , Andra Paraschiv , Norbert Slusarek , Colin Ian King , Alexander Popov CC: , , , , , , Subject: [RFC PATCH v7 11/22] virtio/vsock: dequeue callback for SOCK_SEQPACKET Date: Tue, 23 Mar 2021 16:12:41 +0300 Message-ID: <20210323131244.2461050-1-arseny.krasnov@kaspersky.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210323130716.2459195-1-arseny.krasnov@kaspersky.com> References: <20210323130716.2459195-1-arseny.krasnov@kaspersky.com> MIME-Version: 1.0 X-Originating-IP: [10.64.68.128] X-ClientProxiedBy: hqmailmbx3.avp.ru (10.64.67.243) To hqmailmbx3.avp.ru (10.64.67.243) X-KSE-ServerInfo: hqmailmbx3.avp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 5.9.20, Database issued on: 03/23/2021 12:55:25 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 10 X-KSE-AntiSpam-Info: Lua profiles 162595 [Mar 23 2021] X-KSE-AntiSpam-Info: LuaCore: 437 437 85ecb8eec06a7bf2f475f889e784f42bce7b4445 X-KSE-AntiSpam-Info: Version: 5.9.20.0 X-KSE-AntiSpam-Info: Envelope from: arseny.krasnov@kaspersky.com X-KSE-AntiSpam-Info: {Prob_from_in_msgid} X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;arseniy-pc.avp.ru:7.1.1;127.0.0.199:7.1.2;kaspersky.com:7.1.1 X-KSE-AntiSpam-Info: Rate: 10 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 03/23/2021 12:58:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 23.03.2021 11:46:00 X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit X-KLMS-Rule-ID: 52 X-KLMS-Message-Action: clean X-KLMS-AntiSpam-Status: not scanned, disabled by settings X-KLMS-AntiSpam-Interceptor-Info: not scanned X-KLMS-AntiPhishing: Clean, bases: 2021/03/23 11:43:00 X-KLMS-AntiVirus: Kaspersky Security for Linux Mail Server, version 8.0.3.30, bases: 2021/03/23 11:40:00 #16480199 X-KLMS-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This adds transport callback and it's logic for SEQPACKET dequeue. Callback fetches RW packets from rx queue of socket until whole record is copied(if user's buffer is full, user is not woken up). This is done to not stall sender, because if we wake up user and it leaves syscall, nobody will send credit update for rest of record, and sender will wait for next enter of read syscall at receiver's side. So if user buffer is full, we just send credit update and drop data. If during copy SEQ_BEGIN was found(and not all data was copied), copying is restarted by reset user's iov iterator(previous unfinished data is dropped). Signed-off-by: Arseny Krasnov --- v6 -> v7: 1) 'struct virtio_vsock_seqpacket_state' now renamed to 'struct virtio_vsock_seq_state'. 2) Field 'seqpacket_state' of 'struct virtio_vsock_sock' now renamed to 'seq_state'. 3) Current message length to process('user_read_seq_len') is set to 0 on error or message dequeue completed sucecssfully. include/linux/virtio_vsock.h | 14 +++ include/uapi/linux/virtio_vsock.h | 16 ++++ net/vmw_vsock/virtio_transport_common.c | 121 ++++++++++++++++++++++++ 3 files changed, 151 insertions(+) diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h index dc636b727179..0e3aa395c07c 100644 --- a/include/linux/virtio_vsock.h +++ b/include/linux/virtio_vsock.h @@ -18,6 +18,12 @@ enum { VSOCK_VQ_MAX = 3, }; +struct virtio_vsock_seq_state { + u32 user_read_seq_len; + u32 user_read_copied; + u32 curr_rx_msg_id; +}; + /* Per-socket state (accessed via vsk->trans) */ struct virtio_vsock_sock { struct vsock_sock *vsk; @@ -36,6 +42,8 @@ struct virtio_vsock_sock { u32 rx_bytes; u32 buf_alloc; struct list_head rx_queue; + + struct virtio_vsock_seq_state seq_state; }; struct virtio_vsock_pkt { @@ -80,6 +88,12 @@ virtio_transport_dgram_dequeue(struct vsock_sock *vsk, struct msghdr *msg, size_t len, int flags); +int +virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk, + struct msghdr *msg, + int flags, + bool *msg_ready, + size_t *msg_len); s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); diff --git a/include/uapi/linux/virtio_vsock.h b/include/uapi/linux/virtio_vsock.h index 1d57ed3d84d2..692f8078cced 100644 --- a/include/uapi/linux/virtio_vsock.h +++ b/include/uapi/linux/virtio_vsock.h @@ -63,8 +63,14 @@ struct virtio_vsock_hdr { __le32 fwd_cnt; } __attribute__((packed)); +struct virtio_vsock_seq_hdr { + __le32 msg_id; + __le32 msg_len; +} __attribute__((packed)); + enum virtio_vsock_type { VIRTIO_VSOCK_TYPE_STREAM = 1, + VIRTIO_VSOCK_TYPE_SEQPACKET = 2, }; enum virtio_vsock_op { @@ -83,6 +89,11 @@ enum virtio_vsock_op { VIRTIO_VSOCK_OP_CREDIT_UPDATE = 6, /* Request the peer to send the credit info to us */ VIRTIO_VSOCK_OP_CREDIT_REQUEST = 7, + + /* Record begin for SOCK_SEQPACKET */ + VIRTIO_VSOCK_OP_SEQ_BEGIN = 8, + /* Record end for SOCK_SEQPACKET */ + VIRTIO_VSOCK_OP_SEQ_END = 9, }; /* VIRTIO_VSOCK_OP_SHUTDOWN flags values */ @@ -91,4 +102,9 @@ enum virtio_vsock_shutdown { VIRTIO_VSOCK_SHUTDOWN_SEND = 2, }; +/* VIRTIO_VSOCK_OP_RW flags values */ +enum virtio_vsock_rw { + VIRTIO_VSOCK_RW_EOR = 1, +}; + #endif /* _UAPI_LINUX_VIRTIO_VSOCK_H */ diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index 833104b71a1c..a8f4326e45e8 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -393,6 +393,114 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, return err; } +static inline void virtio_transport_remove_pkt(struct virtio_vsock_pkt *pkt) +{ + list_del(&pkt->list); + virtio_transport_free_pkt(pkt); +} + +static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk, + struct msghdr *msg, + bool *msg_ready) +{ + struct virtio_vsock_sock *vvs = vsk->trans; + struct virtio_vsock_pkt *pkt; + int err = 0; + size_t user_buf_len = msg->msg_iter.count; + + *msg_ready = false; + spin_lock_bh(&vvs->rx_lock); + + while (!*msg_ready && !list_empty(&vvs->rx_queue) && !err) { + pkt = list_first_entry(&vvs->rx_queue, struct virtio_vsock_pkt, list); + + switch (le16_to_cpu(pkt->hdr.op)) { + case VIRTIO_VSOCK_OP_SEQ_BEGIN: { + /* Unexpected 'SEQ_BEGIN' during record copy: + * Leave receive loop, 'EAGAIN' will restart it from + * outer receive loop, packet is still in queue and + * counters are cleared. So in next loop enter, + * 'SEQ_BEGIN' will be dequeued first. User's iov + * iterator will be reset in outer loop. Also + * send credit update, because some bytes could be + * copied. User will never see unfinished record. + */ + err = -EAGAIN; + break; + } + case VIRTIO_VSOCK_OP_SEQ_END: { + struct virtio_vsock_seq_hdr *seq_hdr; + + seq_hdr = (struct virtio_vsock_seq_hdr *)pkt->buf; + /* First check that whole record is received. */ + + if (vvs->seq_state.user_read_copied != + vvs->seq_state.user_read_seq_len || + le32_to_cpu(seq_hdr->msg_id) != + vvs->seq_state.curr_rx_msg_id) { + /* Tail of current record and head of next missed, + * so this EOR is from next record. Restart receive. + * Current record will be dropped, next headless will + * be dropped on next attempt to get record length. + */ + err = -EAGAIN; + } else { + /* Success. */ + *msg_ready = true; + } + + break; + } + case VIRTIO_VSOCK_OP_RW: { + size_t bytes_to_copy; + size_t pkt_len; + + pkt_len = (size_t)le32_to_cpu(pkt->hdr.len); + bytes_to_copy = min(user_buf_len, pkt_len); + + /* sk_lock is held by caller so no one else can dequeue. + * Unlock rx_lock since memcpy_to_msg() may sleep. + */ + spin_unlock_bh(&vvs->rx_lock); + + if (memcpy_to_msg(msg, pkt->buf, bytes_to_copy)) { + spin_lock_bh(&vvs->rx_lock); + err = -EINVAL; + break; + } + + spin_lock_bh(&vvs->rx_lock); + user_buf_len -= bytes_to_copy; + vvs->seq_state.user_read_copied += pkt_len; + + if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_RW_EOR) + msg->msg_flags |= MSG_EOR; + break; + } + default: + ; + } + + /* For unexpected 'SEQ_BEGIN', keep such packet in queue, + * but drop any other type of packet. + */ + if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_SEQ_BEGIN) { + virtio_transport_dec_rx_pkt(vvs, pkt); + virtio_transport_remove_pkt(pkt); + } + } + + /* Reset current record length on error or whole message received. */ + if (*msg_ready || err) + vvs->seq_state.user_read_seq_len = 0; + + spin_unlock_bh(&vvs->rx_lock); + + virtio_transport_send_credit_update(vsk); + + return err; +} + ssize_t virtio_transport_stream_dequeue(struct vsock_sock *vsk, struct msghdr *msg, @@ -405,6 +513,19 @@ virtio_transport_stream_dequeue(struct vsock_sock *vsk, } EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue); +int +virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk, + struct msghdr *msg, + int flags, bool *msg_ready, + size_t *msg_len) +{ + if (flags & MSG_PEEK) + return -EOPNOTSUPP; + + return virtio_transport_seqpacket_do_dequeue(vsk, msg, msg_ready); +} +EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_dequeue); + int virtio_transport_dgram_dequeue(struct vsock_sock *vsk, struct msghdr *msg,