From patchwork Tue Oct 11 20:05:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Vivier X-Patchwork-Id: 13004307 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 D3723C4332F for ; Tue, 11 Oct 2022 20:09:39 +0000 (UTC) Received: from localhost ([::1]:40026 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oiLZK-0000qa-Mt for qemu-devel@archiver.kernel.org; Tue, 11 Oct 2022 16:09:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55708) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oiLVs-0006P1-LI for qemu-devel@nongnu.org; Tue, 11 Oct 2022 16:06:07 -0400 Received: from mout.kundenserver.de ([212.227.126.135]:50521) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oiLVp-0003jf-9O for qemu-devel@nongnu.org; Tue, 11 Oct 2022 16:06:04 -0400 Received: from lenovo-t14s.redhat.com ([82.142.8.70]) by mrelayeu.kundenserver.de (mreue011 [212.227.15.167]) with ESMTPSA (Nemesis) id 1MQ6C0-1oV5yg0wMK-00M2FA; Tue, 11 Oct 2022 22:05:50 +0200 From: Laurent Vivier To: qemu-devel@nongnu.org Cc: Stefano Stabellini , =?utf-8?q?Daniel_P=2E_Berra?= =?utf-8?q?ng=C3=A9?= , "Dr. David Alan Gilbert" , Jason Wang , "Michael S. Tsirkin" , Paolo Bonzini , Anthony Perard , Greg Kurz , Eric Blake , Laurent Vivier , Stefan Weil , Thomas Huth , Samuel Thibault , Markus Armbruster , Paul Durrant , David Gibson , xen-devel@lists.xenproject.org Subject: [PATCH v11 04/17] qapi: net: introduce a way to bypass qemu_opts_parse_noisily() Date: Tue, 11 Oct 2022 22:05:26 +0200 Message-Id: <20221011200539.1486809-5-lvivier@redhat.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221011200539.1486809-1-lvivier@redhat.com> References: <20221011200539.1486809-1-lvivier@redhat.com> MIME-Version: 1.0 X-Provags-ID: V03:K1:czMHkDkkqeIXGC5qBtBBJS9E3R+8iAb+tiHYhdF9yBURR1ndHa6 HyseRsw6hXxr8C0e8ApsILNkrsyA7JRoMl7JzyocaYXlS2SkzChNjn+5Bqe19Wa0viD4/t+ LrFmMTXEeH2FxcG8Ux5Gveuno4OUDhjHrAgJAx2kqDxPGGZHGVz6CdYChKQ+MpJ0lLPkhqR 6S4RH7ti/+hUqmUhsGO/A== X-UI-Out-Filterresults: notjunk:1;V03:K0:7zEF/nwbU8Q=:EmR44orMNwzKhBn4AVGwfi 1kiyd5nyuX+WrE1w5bfgpfKPQovbt0XTs+/FFKHF2eXorcPVAoJDmclUowOXkc2MwxFkcBqss 3DycEUnzdsk5NkANY2YrwsCMa0isMOwwZFDhPOl1HXO+e+5c8hDfSuGDWlsQM+bQ5+8UYQj46 pAs8x3YFZFi76TPpleExJ97jr1aOiKK9eOb+OClYjeoiMRaNUQefyV3QHRqe8LEkIj6gVAkMQ XmytMcknNthjnGjth6HfEq0UiKk7i69FkdJKzFvriimHfwzr0TfsZWeg0zpnJ72I0iqJ4lhtz +akxaUXA2XAb15xtSp7kZAo2VdlpvBONmWquwTQ+hXXG7EhGr0Vr6kPDPbcy0lfBG8vKldu8V dOhh2hunhwNCznhuJ91Z4xvGpk62cyufc6qNn7Bn/UmPlHssSz40uhjLE4c5DnOADON3RMcKu VKyvFbgBpspNdiGnblUTJbFA7yZyzHUchI4TNR7buDl9Kmet2y9GzU1pSWPOfvO5rQgYrnR1r 6ZayX6qOTl1+ZuyZwMIjwz3qrFFqsEcMGtEYsS7QizDwykc3Hh49uAn0tMj1j/OPrMwted4sk M8S8hmqowtEIKAYBiVr1DNEBAftXsL+ibD4Z+36IEkUke8nGP/VKnGJVS7fYLTpc/rBjBCEhj RW1cFDQD5p7MBbyXRmHlQi3f/B9r6z1wRe5cwv0NkYyKi1w0xeirUtJi+6tXbDLx1nTF3N3FJ dtSqr3BKBcC4/XmamjJqQDa0P4qjoZ/1h33ny48yahjP+taxPR5DMq341fY4CWa7kDtBzPKj1 suAAM3N Received-SPF: permerror client-ip=212.227.126.135; 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 Acked-by: Michael S. Tsirkin --- 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 e69aa43de469..99fb49c7b0ee 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -2801,7 +2801,11 @@ void qemu_init(int argc, char **argv) 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;