From patchwork Mon Sep 26 19:50:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Vivier X-Patchwork-Id: 12989373 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 300B4C6FA82 for ; Mon, 26 Sep 2022 19:56:28 +0000 (UTC) Received: from localhost ([::1]:35436 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ocuDK-0002np-FF for qemu-devel@archiver.kernel.org; Mon, 26 Sep 2022 15:56:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34266) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ocu8D-0008L0-HP for qemu-devel@nongnu.org; Mon, 26 Sep 2022 15:51:11 -0400 Received: from mout.kundenserver.de ([212.227.126.133]:39399) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ocu87-0005w1-3n for qemu-devel@nongnu.org; Mon, 26 Sep 2022 15:51:07 -0400 Received: from lenovo-t14s.redhat.com ([82.142.8.70]) by mrelayeu.kundenserver.de (mreue012 [212.227.15.167]) with ESMTPSA (Nemesis) id 1N3omW-1pL8rX1tnk-00zqRb; Mon, 26 Sep 2022 21:50:55 +0200 From: Laurent Vivier To: qemu-devel@nongnu.org Cc: Jason Wang , Greg Kurz , David Gibson , Thomas Huth , Eric Blake , "Dr. David Alan Gilbert" , Laurent Vivier , Paolo Bonzini , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Markus Armbruster Subject: [PATCH v9 04/16] qapi: net: introduce a way to bypass qemu_opts_parse_noisily() Date: Mon, 26 Sep 2022 21:50:36 +0200 Message-Id: <20220926195048.487915-5-lvivier@redhat.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220926195048.487915-1-lvivier@redhat.com> References: <20220926195048.487915-1-lvivier@redhat.com> MIME-Version: 1.0 X-Provags-ID: V03:K1:sLG6fJdcYfv3Zol1Ufk86YC1Hm5zly8svwEX0OQwSlumT3JLoqv 6JZSLVBcQPYdzGFARW2UeeSeyaJUeq2JGTvS4DzmpOMgXfikgWNHq/mNwBp4eOl7x3+p2Hr t2EcIG9MLOZMd3QEY0wCGNpR8fmAPP/u+t8n3A4K8+y0OPqffmo9FRyV+qFNyCq0urcI9VF 9zWMTjE+Au0rVz+NUaovw== X-UI-Out-Filterresults: notjunk:1;V03:K0:4iNoLifF9GA=:CfcBMXBRlooMwFK7ZjTG92 CRr9yV8YfqQMAAaP6uysb0ubzawIMzQbl2tdiW0j7KD6NdFWLoPbZB5KSUfia9lLIPnZkU1BJ nps4b/NxnsA85Vn5zefE4uip3S9tv7cld6STwRMSwjWkKoBHEZiPlnJm6lRaE4CHuzOAL3y7w ftoj3wf/NZdp1kNmihXZDc/dmhb2KK/sIQGfaAxXaDvT4TYsyrZBYTE3ugErFpi+dy7sa7nju Vt/TPmun/YvYJENoEDE2+2joBQadRwsS50ttR7fy14Dw/etE5/RyDu26ad4a5l2C9I1EVQiuB vlUPejv6byM831fAl0Qj3kjqfLHF4NqjStxSgGvkmCvhLBhT6ON7Pd/acGSk5qpycP8qViq3O KVbEGn3qi4/yjEvq/hn3raAy3x4STMkHCA56L1gs1JYMAcB16NsX3Wsv4WpHOV7MT24fcfP3q JyuJAbg5/ifV64P+xBwK/eivF+j4tXOaL2okNn7h96ELeU88h0pemWAF1/G2QehWMK3SiLyBb tltdZpeHkVrN1N5zl52CO6o5ECSMaSQk+CmXNOUiu077BGX9kSLNrF7DBaYVv/+gHWo35GfB7 tI+zPy8QJlp/IKZRVbosIrPxa2fIQ3SJHWGTbT6fMkBfbPfd7iGDYOFtsSBTAnBodm3ptb3th PYvOjZhDaMYyy6ADPEi+fTadX0Nk1/wIhAjT9gWirCzBhI6DIpvQrn/Wx7E1sC4OB5luOz8ia ndSb6s9jStySLG9Ziyou08ZOm/yA1ttYGG6zbcd13GNpQtPu5DpE/CRCVDgY6cVm2KqdUU+kz yiBqfsg Received-SPF: permerror client-ip=212.227.126.133; envelope-from=lvivier@redhat.com; helo=mout.kundenserver.de 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, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_FAIL=0.001, SPF_HELO_NONE=0.001 autolearn=no 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" As qemu_opts_parse_noisily() flattens the QAPI structures ("type" field of Netdev structure can collides with "type" field of SocketAddress), we introduce a way to bypass qemu_opts_parse_noisily() and use directly visit_type_Netdev() to parse the backend parameters. More details from Markus: qemu_init() passes the argument of -netdev, -nic, and -net to net_client_parse(). net_client_parse() parses with qemu_opts_parse_noisily(), passing QemuOptsList qemu_netdev_opts for -netdev, qemu_nic_opts for -nic, and qemu_net_opts for -net. Their desc[] are all empty, which means any keys are accepted. The result of the parse (a QemuOpts) is stored in the QemuOptsList. Note that QemuOpts is flat by design. In some places, we layer non-flat on top using dotted keys convention, but not here. net_init_clients() iterates over the stored QemuOpts, and passes them to net_init_netdev(), net_param_nic(), or net_init_client(), respectively. These functions pass the QemuOpts to net_client_init(). They also do other things with the QemuOpts, which we can ignore here. net_client_init() uses the opts visitor to convert the (flat) QemOpts to a (non-flat) QAPI object Netdev. Netdev is also the argument of QMP command netdev_add. The opts visitor was an early attempt to support QAPI in (QemuOpts-based) CLI. It restricts QAPI types to a certain shape; see commit eb7ee2cbeb "qapi: introduce OptsVisitor". A more modern way to support QAPI is qobject_input_visitor_new_str(). It uses keyval_parse() instead of QemuOpts for KEY=VALUE,... syntax, and it also supports JSON syntax. The former isn't quite as expressive as JSON, but it's a lot closer than QemuOpts + opts visitor. This commit paves the way to use of the modern way instead. Signed-off-by: Laurent Vivier Reviewed-by: Markus Armbruster --- include/net/net.h | 2 ++ net/net.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++ softmmu/vl.c | 6 ++++- 3 files changed, 64 insertions(+), 1 deletion(-) diff --git a/include/net/net.h b/include/net/net.h index 55023e7e9fa9..025dbf1e143b 100644 --- a/include/net/net.h +++ b/include/net/net.h @@ -220,6 +220,8 @@ extern NICInfo nd_table[MAX_NICS]; extern const char *host_net_devices[]; /* from net.c */ +bool netdev_is_modern(const char *optarg); +void netdev_parse_modern(const char *optarg); void net_client_parse(QemuOptsList *opts_list, const char *str); void show_netdevs(void); void net_init_clients(void); diff --git a/net/net.c b/net/net.c index f056e8aebfb2..ffe3e5a2cf1d 100644 --- a/net/net.c +++ b/net/net.c @@ -54,6 +54,7 @@ #include "net/colo-compare.h" #include "net/filter.h" #include "qapi/string-output-visitor.h" +#include "qapi/qobject-input-visitor.h" /* Net bridge is currently not supported for W32. */ #if !defined(_WIN32) @@ -63,6 +64,16 @@ static VMChangeStateEntry *net_change_state_entry; static QTAILQ_HEAD(, NetClientState) net_clients; +typedef struct NetdevQueueEntry { + Netdev *nd; + Location loc; + QSIMPLEQ_ENTRY(NetdevQueueEntry) entry; +} NetdevQueueEntry; + +typedef QSIMPLEQ_HEAD(, NetdevQueueEntry) NetdevQueue; + +static NetdevQueue nd_queue = QSIMPLEQ_HEAD_INITIALIZER(nd_queue); + /***********************************************************/ /* network device redirectors */ @@ -1562,6 +1573,20 @@ out: return ret; } +static void netdev_init_modern(void) +{ + while (!QSIMPLEQ_EMPTY(&nd_queue)) { + NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); + + QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); + loc_push_restore(&nd->loc); + net_client_init1(nd->nd, true, &error_fatal); + loc_pop(&nd->loc); + qapi_free_Netdev(nd->nd); + g_free(nd); + } +} + void net_init_clients(void) { net_change_state_entry = @@ -1569,6 +1594,8 @@ void net_init_clients(void) QTAILQ_INIT(&net_clients); + netdev_init_modern(); + qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, &error_fatal); @@ -1579,6 +1606,36 @@ void net_init_clients(void) &error_fatal); } +/* + * Does this -netdev argument use modern rather than traditional syntax? + * Modern syntax is to be parsed with netdev_parse_modern(). + * Traditional syntax is to be parsed with net_client_parse(). + */ +bool netdev_is_modern(const char *optarg) +{ + return false; +} + +/* + * netdev_parse_modern() uses modern, more expressive syntax than + * net_client_parse(), but supports only the -netdev option. + * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() + * appends to @qemu_netdev_opts. + */ +void netdev_parse_modern(const char *optarg) +{ + Visitor *v; + NetdevQueueEntry *nd; + + v = qobject_input_visitor_new_str(optarg, "type", &error_fatal); + nd = g_new(NetdevQueueEntry, 1); + visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); + visit_free(v); + loc_save(&nd->loc); + + QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); +} + void net_client_parse(QemuOptsList *opts_list, const char *optarg) { if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { diff --git a/softmmu/vl.c b/softmmu/vl.c index f71fca2a9f73..d4da3e879f61 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -2809,7 +2809,11 @@ void qemu_init(int argc, char **argv, char **envp) break; case QEMU_OPTION_netdev: default_net = 0; - net_client_parse(qemu_find_opts("netdev"), optarg); + if (netdev_is_modern(optarg)) { + netdev_parse_modern(optarg); + } else { + net_client_parse(qemu_find_opts("netdev"), optarg); + } break; case QEMU_OPTION_nic: default_net = 0;