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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1742402244; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=X2sunzIviv4HaQQb3X0yTUOV4nmX52tcxBKEXC5RH8E=; b=VfOUl6h8fVc+Z5oKWXsCi/6QmM0+Cr228ZqWG2zkAVUIb6rH2/sxrlBRS9WRI92YWCJfuT Fkipvmt6vqHRWzCPWQN1Kud7aR+bHxCGmPP4B2kgQ8nBjazFZ1L7V7nLnyCUS60viskCS7 uY8MEIBSIFI58IO3wMEYINNNgztXUE8= X-MC-Unique: ATKPov9GN6qD4rdFZRr3vQ-1 X-Mimecast-MFC-AGG-ID: ATKPov9GN6qD4rdFZRr3vQ_1742402242 From: Juraj Marcin To: qemu-devel@nongnu.org Cc: Juraj Marcin , vsementsov@yandex-team.ru, Paolo Bonzini , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH v2 2/2] utils/qemu-sockets: Introduce keep-alive-idle-period inet socket option Date: Wed, 19 Mar 2025 17:36:20 +0100 Message-ID: <20250319163638.456417-3-jmarcin@redhat.com> In-Reply-To: <20250319163638.456417-1-jmarcin@redhat.com> References: <20250319163638.456417-1-jmarcin@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Juraj Marcin The default idle period for TCP connection could be even 2 hours. However, in some cases, the application needs to be aware of a connection issue much sooner. This is the case, for example, for postcopy live migration. If there is no traffic from the migration destination guest (server-side) to the migration source guest (client-side), the destination keeps waiting for pages indefinitely and does not switch to the postcopy-paused state. This can happen, for example, if the destination QEMU instance is started with '-S' command line option and the machine is not started yet or if the machine is idle and produces no new page faults for not-yet-migrated pages. This patch introduces a new inet socket parameter on platforms where TCP_KEEPIDLE is defined and passes the configured value to the TCP_KEEPIDLE socket option when a client-side or server-side socket is created. The default value is 0, which means system configuration is used, and no custom value is set. Signed-off-by: Juraj Marcin Reviewed-by: Vladimir Sementsov-Ogievskiy --- io/dns-resolver.c | 4 ++++ meson.build | 2 ++ qapi/sockets.json | 5 +++++ util/qemu-sockets.c | 29 +++++++++++++++++++++++++++++ 4 files changed, 40 insertions(+) diff --git a/io/dns-resolver.c b/io/dns-resolver.c index ee7403b65b..03c59673f0 100644 --- a/io/dns-resolver.c +++ b/io/dns-resolver.c @@ -128,6 +128,10 @@ static int qio_dns_resolver_lookup_sync_inet(QIODNSRes= olver *resolver, #endif .has_keep_alive =3D iaddr->has_keep_alive, .keep_alive =3D iaddr->keep_alive, +#ifdef HAVE_TCP_KEEPIDLE + .has_keep_alive_idle_period =3D iaddr->has_keep_alive_idle_per= iod, + .keep_alive_idle_period =3D iaddr->keep_alive_idle_period, +#endif }; =20 (*addrs)[i] =3D newaddr; diff --git a/meson.build b/meson.build index 41f68d3806..e3440b09c8 100644 --- a/meson.build +++ b/meson.build @@ -2734,6 +2734,8 @@ if linux_io_uring.found() config_host_data.set('HAVE_IO_URING_PREP_WRITEV2', cc.has_header_symbol('liburing.h', 'io_uring_prep_w= ritev2')) endif +config_host_data.set('HAVE_TCP_KEEPIDLE', + cc.has_header_symbol('netinet/tcp.h', 'TCP_KEEPIDLE')) =20 # has_member config_host_data.set('HAVE_SIGEV_NOTIFY_THREAD_ID', diff --git a/qapi/sockets.json b/qapi/sockets.json index eb50f64e3a..ddd82b1e66 100644 --- a/qapi/sockets.json +++ b/qapi/sockets.json @@ -59,6 +59,10 @@ # @keep-alive: enable keep-alive when connecting to/listening on this sock= et. # (Since 4.2, not supported for listening sockets until 10.0) # +# @keep-alive-idle-period: time in seconds the connection needs to be idle +# before sending a keepalive packet. Only supported for TCP sockets on +# systems where TCP_KEEPIDLE socket option is defined. (Since 10.0) +# # @mptcp: enable multi-path TCP. (Since 6.1) # # Since: 1.3 @@ -71,6 +75,7 @@ '*ipv4': 'bool', '*ipv6': 'bool', '*keep-alive': 'bool', + '*keep-alive-idle-period': { 'type': 'uint32', 'if': 'HAVE_TCP_KEEPIDL= E' }, '*mptcp': { 'type': 'bool', 'if': 'HAVE_IPPROTO_MPTCP' } } } =20 ## diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c index 99357a4435..23c8a6cc2b 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -217,6 +217,19 @@ static int inet_set_sockopts(int sock, InetSocketAddre= ss *saddr, Error **errp) "Unable to set keep-alive option on socket"); return -1; } +#ifdef HAVE_TCP_KEEPIDLE + if (saddr->has_keep_alive_idle_period && + saddr->keep_alive_idle_period) { + int keep_idle =3D saddr->has_keep_alive_idle_period; + ret =3D setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, &keep_idle, + sizeof(keep_idle)); + if (ret < 0) { + error_setg_errno(errp, errno, + "Unable to set TCP keep-alive idle option= on socket"); + return -1; + } + } +#endif } return 0; } @@ -697,6 +710,22 @@ int inet_parse(InetSocketAddress *addr, const char *st= r, Error **errp) } addr->has_keep_alive =3D true; } +#ifdef HAVE_TCP_KEEPIDLE + begin =3D strstr(optstr, ",keep-alive-idle-period=3D"); + if (begin) { + begin +=3D strlen(",keep-alive-idle-period=3D"); + if (sscanf(begin, "%" PRIu32 "%n", &addr->keep_alive_idle_period, = &pos) !=3D 1 || + (begin[pos] !=3D '\0' && begin[pos] !=3D ',')) { + error_setg(errp, "error parsing keep-alive-idle-period argumen= t"); + return -1; + } + if (addr->keep_alive_idle_period > INT_MAX) { + error_setg(errp, "keep-alive-idle-period value is too large"); + return -1; + } + addr->has_keep_alive_idle_period =3D true; + } +#endif #ifdef HAVE_IPPROTO_MPTCP begin =3D strstr(optstr, ",mptcp"); if (begin) { --=20 2.48.1