From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f53.google.com (mail-wr1-f53.google.com [209.85.221.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4B1233E5EC0 for ; Mon, 12 Oct 2026 23:55:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791849334; cv=none; b=auBeCQTI/lCAz6ydV7PbBbHBV05FDrTZaXQrrUHBSQL62nlH4uKpbWy3UhlbdFWeEW/Lhi6+Kj1apj2zyN6nHYBlJVWel+Zbez77yFoWxD8/cwNXxIb3rFZhNfEDnwIzJHwLz3N14gghBacVmGVcEZdsAvoH7hmlVcdxWezI4+g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791849334; c=relaxed/simple; bh=7Jppg6yM4EgF1LiDYJeOE79I8PpMZq9yJUvSKhHYuQk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QMJfwdKCiwyel6Z8VjdwJtMchmheU9BmvvnqyxGwEP6KYS7ctOFHaaUBAP77Zn9BvxEzf0SqLACV/yDm1t3eQwk0zVXhV0cNDBzTthC4BUpeXBMplPzUenFece4DcMyvLoVAr9MNyZWaqcIarn5Wl97FU2zW9bJouNXslRi2TyI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=mTIiAExt; arc=none smtp.client-ip=209.85.221.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="mTIiAExt" Received: by mail-wr1-f53.google.com with SMTP id ffacd0b85a97d-48c14a06c95so1788529f8f.1 for ; Mon, 12 Oct 2026 16:55:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1791849331; x=1792454131; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=gBDjfcYpOnFL2AwGB62aVDEEQFBwxjTJIGQXAUNz3X8=; b=mTIiAExtp+vzTD3O9gYjellUybDuRPWQLdJbEwn+wHzhpp0Gk8Ye0d5sDxArWvlTgf xoP6QekHy5aJOwW+GzV0/ZVHx7Yuv1RqMBBzThto0HrpwYYuqCThyujVdS/cJYgcWhhh 8CLn677wd1KYS5Ta0l+yU8P/hNJ2MS+Tw+kOeP1q+at5//2bWRlFadA4n0M3W5MXM37A wXZPwWT8g4Mouk3nEdujwolsqiXts6Eldp+8k5tAObRHee/iFFGlpVukHhrkt2QeopP8 Tk4ul8sz+6gD5UXRYTXw4hc9COctb5QInfJRR0F5LeYHOr3gMOJI8ENeJqh84Pvnr7EQ YHgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791849331; x=1792454131; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=gBDjfcYpOnFL2AwGB62aVDEEQFBwxjTJIGQXAUNz3X8=; b=kcrisFrNHKt6LyKE0hqfh8I5yn6Xx+BQnGavPRW+NceUNR3qTgHLkoj+6bJ3HbL6g7 eUp54+sfezQdHpUAu9HD3vZsVbDUWqp9ig2tZK4GXH6JIeEhSq/0TddbZf4hN6amnevN SzfxGnC7nDruWVOG4VXe3hW0ytSaKphs7N3BxVVMm4PevzSwE8y74YTAxzxX7MpKgcXq VuwrVROp20bpNOiVv5gQStSyKW142LhJe0Xtas4HMDe3oGlv8eNC64P1sxpqQp1Rb39s 3dIecup27/s+ewswxYBsGWSWu5wzyFxPMLexPuH6v5Na5FnibYGdKpWmxnz0EnnyT8s2 dxEw== X-Forwarded-Encrypted: i=1; AKwUvBwqzjtfl7OBOHiOyvFmE/IX+MMZ1h+yvHhyV36+ABvj+PbkSTcxW9UAf0r7t1IAiT99agPJ+OzNlqYIahc=@vger.kernel.org X-Gm-Message-State: AFq9FYLCIV+pWpXg6e+Xg32Ov+WkV8S5lulBdYyIbHhGXrs2O6sIbMsO MY+t16yWYeaOSZewAFNvFt/DZ8ONbq0VWJ1G3FrgUcX8f6NxQs8y1Ktg X-Gm-Gg: AYBFou2wGr+EiFGXeRKCNkX7ZWojrdkq7zkHJg2Z7FKHRW+YRkreKreiWTlY6fr+Qmz cTCVLejFNNOpD0+J5aQyGw9NQaon1TgPnGx/y4NNI1nguC78vW31JenVolcnpJSRKcecGptmq5y +BDRY8I6Vzf6eqtuhqttyv3cUwOWoCTUGoRbMIt8tpr6c2DVTsRk0Q/ZxBM62/TslCpU6rXdaVQ JCgyoHzv4IfIB5P0l4zB11774ONGtIlYc4L+93E3kKdl07F0SDqB1sQipp3OkqUpGzuwij5FXvm ykWUkr7KsclflgQcK6wxohK/r4bpGv3BqtVLrdT7pWgTHjsGiRKdBfnqKlSr1eYaZEfmPoGDr8z NbFLthhuONQEFupLX1B3yLuCTGPnh1erGaWpdXqLFTbnK+sMA22ZC6kQfCHLEdEIMGIn5A9TG8Y WMPIwvzXRikQXjQ1a3jT7I7VkLXIEGA/s10xRQ/6K41YXm+Qp2uHbt8G2IHkfMnMmp4De/hiz7A s/kyRGtcgc7rxMLQY74v0TfxAgwlcV1ffPUfpPdreRicavlylGoU0+qfcCl X-Received: by 2002:a05:6000:290b:b0:487:2805:6834 with SMTP id ffacd0b85a97d-48dbace156emr19400809f8f.42.1791849331313; Mon, 12 Oct 2026 16:55:31 -0700 (PDT) Received: from dohko.chello.ie (188-141-5-72.dynamic.upc.ie. [188.141.5.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48de0967a0dsm1933762f8f.3.2026.10.12.16.55.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Oct 2026 16:55:30 -0700 (PDT) From: David Carlier To: netdev@vger.kernel.org Cc: sgarzare@redhat.com, bobbyeshleman@gmail.com, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, David Carlier Subject: [PATCH net-next 1/2] vsock: support SO_INQ on stream sockets Date: Tue, 13 Oct 2026 00:55:23 +0100 Message-ID: <20261012235524.41468-2-devnexen@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261012235524.41468-1-devnexen@gmail.com> References: <20261012235524.41468-1-devnexen@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit SO_INQ makes recvmsg() return the bytes left in the receive queue in an SCM_INQ cmsg, saving a SIOCINQ call per receive. AF_UNIX stream sockets support it, AF_VSOCK fails with ENOPROTOOPT. Add it for SOCK_STREAM, reusing the hint already computed for io_uring. As with TCP_INQ, 1 is reported once the stream is finished so the caller reads again and sees EOF. No cmsg is sent when the transport cannot report the queue length. SOCK_SEQPACKET is refused, as on AF_UNIX: its transport callback counts messages, not bytes. Signed-off-by: David Carlier --- include/net/af_vsock.h | 1 + net/vmw_vsock/af_vsock.c | 41 +++++++++++++++++++++++++++++++--------- 2 files changed, 33 insertions(+), 9 deletions(-) diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index 5549298c1ec6..e8481f12312e 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -68,6 +68,7 @@ struct vsock_sock { u64 buffer_size; u64 buffer_min_size; u64 buffer_max_size; + bool recvmsg_inq; /* Private to transport. */ void *trans; diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 1c2d1cea67f4..874dc1545a35 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -2050,29 +2050,38 @@ static int vsock_connectible_setsockopt(struct socket *sock, transport = vsk->transport; if (level == SOL_SOCKET) { - int zerocopy; + int v; - if (optname != SO_ZEROCOPY) { + if (optname != SO_ZEROCOPY && optname != SO_INQ) { release_sock(sk); return sock_setsockopt(sock, level, optname, optval, optlen); } /* Use 'int' type here, because variable to - * set this option usually has this type. + * set these options usually has this type. */ - COPY_IN(zerocopy); + COPY_IN(v); - if (zerocopy < 0 || zerocopy > 1) { + if (v < 0 || v > 1) { err = -EINVAL; goto exit; } + if (optname == SO_INQ) { + if (sk->sk_type != SOCK_STREAM) { + err = -ENOPROTOOPT; + goto exit; + } + vsk->recvmsg_inq = v; + goto exit; + } + if (transport && !vsock_msgzerocopy_allow(transport)) { err = -EOPNOTSUPP; goto exit; } - sock_valbool_flag(sk, SOCK_ZEROCOPY, zerocopy); + sock_valbool_flag(sk, SOCK_ZEROCOPY, v); goto exit; } @@ -2581,6 +2590,7 @@ __vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, struct sock *sk; struct vsock_sock *vsk; const struct vsock_transport *transport; + bool do_cmsg = false; int err; sk = sock->sk; @@ -2637,13 +2647,26 @@ __vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, err = __vsock_seqpacket_recvmsg(sk, msg, len, flags); out: - /* Seqpacket has_data counts messages, while io_uring treats msg_inq as - * a byte length when sizing retries, so only streams report a hint. + /* Seqpacket has_data counts messages, while SCM_INQ reports bytes and + * io_uring treats msg_inq as a byte length when sizing retries, so + * only streams report it. */ - if (msg->msg_get_inq && err >= 0 && sk->sk_type == SOCK_STREAM) + if ((vsk->recvmsg_inq | msg->msg_get_inq) && err >= 0 && + sk->sk_type == SOCK_STREAM) { msg->msg_inq = vsock_stream_inq_hint(sk); + /* A negative hint means the transport could not tell. SCM_INQ + * has no encoding for that, so report nothing. + */ + do_cmsg = vsk->recvmsg_inq && msg->msg_inq >= 0; + } + release_sock(sk); + + if (do_cmsg) + put_cmsg(msg, SOL_SOCKET, SCM_INQ, sizeof(msg->msg_inq), + &msg->msg_inq); + return err; } -- 2.55.0