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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1741012427; 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=ALVHmok+ZJdOQ2tcqIX7TrVFCvB91OaBNArCu7swjws=; b=NPtdG+2a0AcifJ1JVkdCU4Dd9NY9VUvAi2EMV49Cg+MBFVWx8cFNB9Cz2kGhd45b5K9xy9 w+WTxVtJHaGj0QH/fNjomIx7ewN9kFFtldoIDF+B1zC4po8IeFTkXD11mqYhAmu7L+DRv/ N5Z3f9L4i++XgNix1QA5H/HgEYuhwps= X-MC-Unique: wFe-Jdp1O2-aakpqcxie1g-1 X-Mimecast-MFC-AGG-ID: wFe-Jdp1O2-aakpqcxie1g_1741012416 From: Juraj Marcin To: qemu-devel@nongnu.org Cc: Juraj Marcin , vsementsov@virtuozzo.com, =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Paolo Bonzini Subject: [PATCH 1/2] util/qemu-sockets: Add support for keep-alive flag to passive sockets Date: Mon, 3 Mar 2025 15:33:05 +0100 Message-ID: <20250303143312.640909-2-jmarcin@redhat.com> In-Reply-To: <20250303143312.640909-1-jmarcin@redhat.com> References: <20250303143312.640909-1-jmarcin@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 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" Commit aec21d3175 (qapi: Add InetSocketAddress member keep-alive) introduces the keep-alive flag, which enables the SO_KEEPALIVE socket option, but only on client-side sockets. However, this option is also useful for server-side sockets, so they can check if a client is still reachable or drop the connection otherwise. This patch enables the SO_KEEPALIVE socket option on passive server-side sockets if the keep-alive flag is enabled. This socket option is then inherited by active server-side sockets communicating with connected clients. This patch also fixes an issue in 'qio_dns_resolver_lookup_sync_inet()' where the keep-alive flag is not copied together with other attributes. Signed-off-by: Juraj Marcin --- io/dns-resolver.c | 2 ++ qapi/sockets.json | 4 ++-- util/qemu-sockets.c | 19 +++++++++++++------ 3 files changed, 17 insertions(+), 8 deletions(-) diff --git a/io/dns-resolver.c b/io/dns-resolver.c index 53b0e8407a..ee7403b65b 100644 --- a/io/dns-resolver.c +++ b/io/dns-resolver.c @@ -126,6 +126,8 @@ static int qio_dns_resolver_lookup_sync_inet(QIODNSReso= lver *resolver, .has_mptcp =3D iaddr->has_mptcp, .mptcp =3D iaddr->mptcp, #endif + .has_keep_alive =3D iaddr->has_keep_alive, + .keep_alive =3D iaddr->keep_alive, }; =20 (*addrs)[i] =3D newaddr; diff --git a/qapi/sockets.json b/qapi/sockets.json index 6a95023315..eb50f64e3a 100644 --- a/qapi/sockets.json +++ b/qapi/sockets.json @@ -56,8 +56,8 @@ # @ipv6: whether to accept IPv6 addresses, default try both IPv4 and # IPv6 # -# @keep-alive: enable keep-alive when connecting to this socket. Not -# supported for passive sockets. (Since 4.2) +# @keep-alive: enable keep-alive when connecting to/listening on this sock= et. +# (Since 4.2, not supported for listening sockets until 10.0) # # @mptcp: enable multi-path TCP. (Since 6.1) # diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c index 77477c1cd5..c30e4ac2ce 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -220,12 +220,6 @@ static int inet_listen_saddr(InetSocketAddress *saddr, int saved_errno =3D 0; bool socket_created =3D false; =20 - if (saddr->keep_alive) { - error_setg(errp, "keep-alive option is not supported for passive " - "sockets"); - return -1; - } - memset(&ai,0, sizeof(ai)); ai.ai_flags =3D AI_PASSIVE; if (saddr->has_numeric && saddr->numeric) { @@ -344,6 +338,19 @@ listen_failed: return -1; =20 listen_ok: + if (saddr->keep_alive) { + int val =3D 1; + int ret =3D setsockopt(slisten, SOL_SOCKET, SO_KEEPALIVE, + &val, sizeof(val)); + + if (ret < 0) { + error_setg_errno(errp, errno, "Unable to set KEEPALIVE"); + close(slisten); + slisten =3D -1; + goto exit; + } + } +exit: freeaddrinfo(res); return slisten; } --=20 2.48.1 From nobody Wed Mar 5 02:31:48 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1741012432; 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=lXMzolwNc1Q4Al27OWqc7aD1YS+U1HS0kfuILgDIM3w=; b=YsscSgqWbz9Z0YOjxNgQl44wrcNYguM5QUrXt4le8hYr2HG5o12ceHX9cmNK3VqGR9sdPV mbSWt/biZ4JHL5ZT0OMmuihh0VQs6bFNN42uC74E0dwB/h60y6KUpEg978JdFr9udY9cEW xomG3tN/y+KuPrqlGXMIlZfBCq9CksU= X-MC-Unique: uiVaxy7_NHClNJDEM1P1Ww-1 X-Mimecast-MFC-AGG-ID: uiVaxy7_NHClNJDEM1P1Ww_1741012426 From: Juraj Marcin To: qemu-devel@nongnu.org Cc: Juraj Marcin , vsementsov@virtuozzo.com, =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Paolo Bonzini Subject: [PATCH 2/2] utils/qemu-sockets: Introduce keep-alive-idle-period inet socket option Date: Mon, 3 Mar 2025 15:33:06 +0100 Message-ID: <20250303143312.640909-3-jmarcin@redhat.com> In-Reply-To: <20250303143312.640909-1-jmarcin@redhat.com> References: <20250303143312.640909-1-jmarcin@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 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" 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 --- io/dns-resolver.c | 4 ++++ meson.build | 2 ++ qapi/sockets.json | 5 +++++ util/qemu-sockets.c | 39 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 50 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 0ee79c664d..ca726f317f 100644 --- a/meson.build +++ b/meson.build @@ -2724,6 +2724,8 @@ config_host_data.set('HAVE_OPTRESET', cc.has_header_symbol('getopt.h', 'optreset')) config_host_data.set('HAVE_IPPROTO_MPTCP', cc.has_header_symbol('netinet/in.h', 'IPPROTO_MPTCP')) +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 c30e4ac2ce..edcda846ef 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -349,6 +349,18 @@ listen_ok: slisten =3D -1; goto exit; } +#ifdef HAVE_TCP_KEEPIDLE + if (saddr->has_keep_alive_idle_period && saddr->keep_alive_idle_pe= riod) { + int keepidle =3D saddr->has_keep_alive_idle_period; + ret =3D setsockopt(slisten, IPPROTO_TCP, TCP_KEEPIDLE, &keepid= le, sizeof(keepidle)); + if (ret < 0) { + error_setg_errno(errp, errno, "Unable to set TCP_KEEPIDLE"= ); + close(slisten); + slisten =3D -1; + goto exit; + } + } +#endif } exit: freeaddrinfo(res); @@ -492,6 +504,17 @@ int inet_connect_saddr(InetSocketAddress *saddr, Error= **errp) close(sock); return -1; } +#ifdef HAVE_TCP_KEEPIDLE + if (saddr->has_keep_alive_idle_period && saddr->keep_alive_idle_pe= riod) { + int keepidle =3D saddr->keep_alive_idle_period; + ret =3D setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, &keepidle,= sizeof(keepidle)); + if (ret < 0) { + error_setg_errno(errp, errno, "Unsable to set TCP_KEEPIDLE= "); + close(sock); + return -1; + } + } +#endif } =20 return sock; @@ -698,6 +721,22 @@ 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