From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E73333A0E99 for ; Tue, 7 Apr 2026 09:14:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775553249; cv=none; b=CGYEv8yfYNJg2HLWJqDbTCT1yH/H1V17aNaRDIJFowumYcwoA0ZUBrqIFIJbDQwZCV4e3z51CNw5yGSkuIiKConjzdHqa0LXeUK//qpjnFmOaLXMmldEU9UwWZ6N9uPGTXN0vkykxm/+Tx4ofu7y0WO/uOlSj6txKQGtCtCLLWQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775553249; c=relaxed/simple; bh=TPyeaXldjZ/vNi3cTj7MlzLbGl/Ixp9Pbj/uTFr2sk4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AXq3ex3FBQDJ6XKZw1Eym2Nyj32bXVSSMbH0cIZQzdeGWwSg28w5EHyNwASMuwDGmmX5PpaG8LHn2qihs1cxjrHEma3HjJKzDx+z4XbcEakX2Z6kCqOivykXRN/VPzytXhjIVpdvG+9p/rbzXXE3Ny/2zPQZh9Rpua3MqZPINhs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Y3206M/x; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=X7rymZQj; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Y3206M/x"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="X7rymZQj" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1775553247; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5MvBSgtjWIPj7YtiYQ1QdgeAu7KbULO0Duu0OFbmnZU=; b=Y3206M/xTs2TDRr/lJLUS/y5+GhxLpu3pKz6HiN4T7bxK54jMTho8JYIN9iyOBjttvZbh1 Bjwvwx2+/5ZdxYYdGDcCXxWa1NyEnDOA12zrT2GEWPa52XmmxRm6IulfOIxHez/I9GFr27 zO1EFJayt/xU6xBjRKbaRuy7yfrNIqE= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-536-XvJmONGQOcCqhMxIy59www-1; Tue, 07 Apr 2026 05:14:05 -0400 X-MC-Unique: XvJmONGQOcCqhMxIy59www-1 X-Mimecast-MFC-AGG-ID: XvJmONGQOcCqhMxIy59www_1775553245 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-4839fc4cef6so58568115e9.0 for ; Tue, 07 Apr 2026 02:14:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1775553244; x=1776158044; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=5MvBSgtjWIPj7YtiYQ1QdgeAu7KbULO0Duu0OFbmnZU=; b=X7rymZQjmzMh+azmi4F5vc6e4635bgO7zxenf3Ts58RlzGBol7OgBILGGoGrjqWLlV m903/w/68zYOC4RU8j0lfYgqPUnGCIybxmdsKZY1bl4qLK3chXEAqdk2/X477IZnS+Og ExaLcvO8n5dzBabvo/YAZO5lj3/KFjnmwvHd7qTEfu/cr16WjQSbSz3F+W6z8iE8znVE 64MCoKWscpO5W7836p7DMMLMu0IttuCKCkJXAfm6zbhB2WJF2AsQezJf+KigvvfOqKY5 HE2Gj3yjMByuEn9O6Q0Bd0kP5yruq1NW5FSHtOhx4McPfcupv9akLzXQyG0HGYJKf92C ROVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775553244; x=1776158044; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=5MvBSgtjWIPj7YtiYQ1QdgeAu7KbULO0Duu0OFbmnZU=; b=aOKRPvkp6zg9ZdTXo4nJVH/Wxpvv6fyCteqOCJikpsFUcuoveNZoWJS9WtDN1UuIoF ZmveV4j+V09cl1wojTkehpukAWf9j+TJwoF7QTOuewfG0e+0MyMbOXEvXT9j5QbCPClz Gqj60pO/hoNX1KAU+HUge14DLOUTDPz9mmBD1S4tmyX61dEvIrEL8cCmoKhZ3NUBaQBN N4u1xxyXun7LrFdvtP+VMeIEtHFbNc8QpY5kCa0En7mlrJjJeED9hqrLlLq5e7la6BWz jNsTXNQhIlrfqPj+8Aoc+lD1WSMMyHWYOba0jyosjsUwSR6rbh0FtEDuMCa94xwINM3C JGPA== X-Forwarded-Encrypted: i=1; AJvYcCUMmvMvgQ7RjmQrwtqIe2UNe2T/U42uTMsrlNwpeXewxKrNWBF6a92rlbja3HMPzx/ngVrqAdU=@vger.kernel.org X-Gm-Message-State: AOJu0YwfAYwc8kGHpdkVu4ayMPtGjsECADF/kXPoSywjtUYgZvugiLXW ri37ltR5uOjxUtrFCA4qE2trdFAZSFebGLJ4M9bDQFPPOOkX2Xz/dXuyKZths8JncFMonprW+mp sYxiLRrAc4kHZCuZIZ4LlD3U6TwXtRA5NQbq/FtWmI5XGlgPMRi567FuwBy6mqOFyOChNBZm7ie 5NKKsWJEObxZk+l9EZDtnQg7i8ioM+tKs7XV8lXE8XFhgh X-Gm-Gg: AeBDieuL7QvbErhUQvy4tr4lPj7uryM6KOS/GFJ1uu4w1RvjJjbR6LBs90WAHkwR1jj t2V19BbRyYnWoQQC35ICctD6seSP8Dqho2L/oIVmrXc8amBko5z+fB55Vb9dljietbtAjDGiTl1 qEud48xZInUWwKJ9rWmWj9PXjawMSHxF4B3BS11XlSf8HHRxrgz3heFULm5qLVzzGINxk0HMK5z qxfJzgbT3XiwrOWEHP1TO0LOIXQD5k7J7mrygm/twiZ6is/RFHu6+PKKmkFq4Oqu4gdzSeCI9Eq +fsGsbG5ZolNzMsPj0qxwdzFxjBmNrSkezC/Xf+llM3bTN4DJR5CpmTlAI0Y/pke5eLW43JI5IO iz83VwBKCAbSr00KOeZY6mO0dYT5DO3MMRIMJ8kUY0etma2X8mZGzk4j0xjNw X-Received: by 2002:a05:600c:620d:b0:485:fbd2:f72 with SMTP id 5b1f17b1804b1-4889945faa5mr212240265e9.1.1775553244312; Tue, 07 Apr 2026 02:14:04 -0700 (PDT) X-Received: by 2002:a05:600c:620d:b0:485:fbd2:f72 with SMTP id 5b1f17b1804b1-4889945faa5mr212239435e9.1.1775553243640; Tue, 07 Apr 2026 02:14:03 -0700 (PDT) Received: from lleonard-thinkpadx1carbongen13.rmtit.csb ([176.206.19.176]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48895e19c10sm342892015e9.8.2026.04.07.02.14.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Apr 2026 02:14:03 -0700 (PDT) From: Luigi Leonardi Date: Tue, 07 Apr 2026 11:13:56 +0200 Subject: [PATCH net v2 2/3] vsock/test: handle MSG_PEEK in `recv_buf` Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260407-fix_peek-v2-2-2e2581dc8b7c@redhat.com> References: <20260407-fix_peek-v2-0-2e2581dc8b7c@redhat.com> In-Reply-To: <20260407-fix_peek-v2-0-2e2581dc8b7c@redhat.com> To: Stefan Hajnoczi , Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Arseniy Krasnov Cc: kvm@vger.kernel.org, virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Luigi Leonardi X-Mailer: b4 0.14.3 `recv_buf` does not handle the MSG_PEEK flag correctly: it keeps calling `recv` until all requested bytes are available or an error occurs. The problem is how it calculates the amount of bytes read: MSG_PEEK doesn't consume any bytes, will re-read the same bytes from the buffer head, so, summing the return value every time is wrong. Moreover, MSG_PEEK doesn't consume the bytes in the buffer, so if the requested amount is more than the bytes available, the loop will never terminate, because `recv` will never return EOF. For this reason we need to compare the amount of read bytes with the number of bytes expected. Add a check, and if the MSG_PEEK flag is present, update the counter of read bytes differently, and break if we read the expected amount. This allows us to simplify the `test_stream_credit_update_test`, by reusing `recv_buf`. Suggested-by: Stefano Garzarella Signed-off-by: Luigi Leonardi --- tools/testing/vsock/util.c | 8 ++++++++ tools/testing/vsock/vsock_test.c | 13 +------------ 2 files changed, 9 insertions(+), 12 deletions(-) diff --git a/tools/testing/vsock/util.c b/tools/testing/vsock/util.c index 9430ef5b8bc3..f12425ca99ed 100644 --- a/tools/testing/vsock/util.c +++ b/tools/testing/vsock/util.c @@ -399,6 +399,14 @@ void recv_buf(int fd, void *buf, size_t len, int flags, ssize_t expected_ret) if (ret == 0 || (ret < 0 && errno != EINTR)) break; + if (flags & MSG_PEEK) { + if (ret == expected_ret) { + nread = ret; + break; + } + continue; + } + nread += ret; } while (nread < len); timeout_end(); diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c index 5bd20ccd9335..bdb0754965df 100644 --- a/tools/testing/vsock/vsock_test.c +++ b/tools/testing/vsock/vsock_test.c @@ -1500,18 +1500,7 @@ static void test_stream_credit_update_test(const struct test_opts *opts, } /* Wait until there will be 128KB of data in rx queue. */ - while (1) { - ssize_t res; - - res = recv(fd, buf, buf_size, MSG_PEEK); - if (res == buf_size) - break; - - if (res <= 0) { - fprintf(stderr, "unexpected 'recv()' return: %zi\n", res); - exit(EXIT_FAILURE); - } - } + recv_buf(fd, buf, buf_size, MSG_PEEK, buf_size); /* There is 128KB of data in the socket's rx queue, dequeue first * 64KB, credit update is sent if 'low_rx_bytes_test' == true. -- 2.53.0