From patchwork Tue Apr 16 14:42:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Maciej S. Szmigiero" X-Patchwork-Id: 13631992 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A3FA5C04FF9 for ; Tue, 16 Apr 2024 14:46:06 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rwk2G-0004vL-Uc; Tue, 16 Apr 2024 10:43:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rwk2E-0004td-KM for qemu-devel@nongnu.org; Tue, 16 Apr 2024 10:43:46 -0400 Received: from vps-vb.mhejs.net ([37.28.154.113]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rwk2B-0001zN-T5 for qemu-devel@nongnu.org; Tue, 16 Apr 2024 10:43:46 -0400 Received: from MUA by vps-vb.mhejs.net with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1rwk1s-0002ci-5r; Tue, 16 Apr 2024 16:43:24 +0200 From: "Maciej S. Szmigiero" To: Peter Xu , Fabiano Rosas Cc: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Eric Blake , Markus Armbruster , Avihai Horon , Joao Martins , qemu-devel@nongnu.org Subject: [PATCH RFC 02/26] migration: Add migration channel header send/receive Date: Tue, 16 Apr 2024 16:42:41 +0200 Message-ID: <636cec92eb801f13ba893de79d4872f5d8342097.1713269378.git.maciej.szmigiero@oracle.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=37.28.154.113; envelope-from=mail@maciej.szmigiero.name; helo=vps-vb.mhejs.net X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Avihai Horon Add functions to send and receive migration channel header. Signed-off-by: Avihai Horon [MSS: Mark MigChannelHeader as packed, remove device id from it] Signed-off-by: Maciej S. Szmigiero --- migration/channel.c | 59 ++++++++++++++++++++++++++++++++++++++++++ migration/channel.h | 14 ++++++++++ migration/trace-events | 2 ++ 3 files changed, 75 insertions(+) diff --git a/migration/channel.c b/migration/channel.c index f9de064f3b13..a72e85f5791c 100644 --- a/migration/channel.c +++ b/migration/channel.c @@ -21,6 +21,7 @@ #include "io/channel-socket.h" #include "qemu/yank.h" #include "yank_functions.h" +#include "options.h" /** * @migration_channel_process_incoming - Create new incoming migration channel @@ -93,6 +94,64 @@ void migration_channel_connect(MigrationState *s, error_free(error); } +int migration_channel_header_recv(QIOChannel *ioc, MigChannelHeader *header, + Error **errp) +{ + uint64_t header_size; + int ret; + + ret = qio_channel_read_all_eof(ioc, (char *)&header_size, + sizeof(header_size), errp); + if (ret == 0 || ret == -1) { + return -1; + } + + header_size = be64_to_cpu(header_size); + if (header_size > sizeof(*header)) { + error_setg(errp, + "Received header of size %lu bytes which is greater than " + "max header size of %lu bytes", + header_size, sizeof(*header)); + return -EINVAL; + } + + ret = qio_channel_read_all_eof(ioc, (char *)header, header_size, errp); + if (ret == 0 || ret == -1) { + return -1; + } + + header->channel_type = be32_to_cpu(header->channel_type); + + trace_migration_channel_header_recv(header->channel_type, + header_size); + + return 0; +} + +int migration_channel_header_send(QIOChannel *ioc, MigChannelHeader *header, + Error **errp) +{ + uint64_t header_size = sizeof(*header); + int ret; + + if (!migrate_channel_header()) { + return 0; + } + + trace_migration_channel_header_send(header->channel_type, + header_size); + + header_size = cpu_to_be64(header_size); + ret = qio_channel_write_all(ioc, (char *)&header_size, sizeof(header_size), + errp); + if (ret) { + return ret; + } + + header->channel_type = cpu_to_be32(header->channel_type); + + return qio_channel_write_all(ioc, (char *)header, sizeof(*header), errp); +} /** * @migration_channel_read_peek - Peek at migration channel, without diff --git a/migration/channel.h b/migration/channel.h index 5bdb8208a744..95d281828aaa 100644 --- a/migration/channel.h +++ b/migration/channel.h @@ -29,4 +29,18 @@ int migration_channel_read_peek(QIOChannel *ioc, const char *buf, const size_t buflen, Error **errp); +typedef enum { + MIG_CHANNEL_TYPE_MAIN, +} MigChannelTypes; + +typedef struct QEMU_PACKED { + uint32_t channel_type; +} MigChannelHeader; + +int migration_channel_header_send(QIOChannel *ioc, MigChannelHeader *header, + Error **errp); + +int migration_channel_header_recv(QIOChannel *ioc, MigChannelHeader *header, + Error **errp); + #endif diff --git a/migration/trace-events b/migration/trace-events index f0e1cb80c75b..e48607d5a6a2 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -198,6 +198,8 @@ migration_transferred_bytes(uint64_t qemu_file, uint64_t multifd, uint64_t rdma) # channel.c migration_set_incoming_channel(void *ioc, const char *ioctype) "ioc=%p ioctype=%s" migration_set_outgoing_channel(void *ioc, const char *ioctype, const char *hostname, void *err) "ioc=%p ioctype=%s hostname=%s err=%p" +migration_channel_header_send(uint32_t channel_type, uint64_t header_size) "Migration channel header send: channel_type=%u, header_size=%lu" +migration_channel_header_recv(uint32_t channel_type, uint64_t header_size) "Migration channel header recv: channel_type=%u, header_size=%lu" # global_state.c migrate_state_too_big(void) ""