From nobody Mon Feb 9 08:10:24 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1615795269; cv=none; d=zohomail.com; s=zohoarc; b=hCiSMUTLlxROQpAnATND95Q+Qx3soVd/lOCGSPwEP3MPH3nyTJ7M5ndqWjME57S0kf6guzD9SPA6uli53mawBh+Wh284fYVOZqAbqBify7gwqMUVns0eIAQix5XAUI7fFeLR2vOdLBfMvr5RUvgSCRvFgnb4cV+f+h1j7zD58ak= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1615795269; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=GoYz0zg2OAHB4zaizuLLFR6HQ9SymmyDjJ2jkSEyIQU=; b=am8tLFt10rVcIkqZfnS/j1Eu7DItXJQtpP+rgZiFDT2zoC26Xi1At4O1DpnIsySKUWUadKD40kDPDuANDchih1NfnLivikBps8kM8X0jJpIvcMPq6EksEqzWu/3fxMCCaByBUHGC1agOJsO1pSnRjuMucOTrccHO7VTmcxz7Sow= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 161579526962158.33748576447624; Mon, 15 Mar 2021 01:01:09 -0700 (PDT) Received: from localhost ([::1]:43974 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lLiA0-0003un-HB for importer@patchew.org; Mon, 15 Mar 2021 04:01:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43486) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lLi6k-00086D-Ig for qemu-devel@nongnu.org; Mon, 15 Mar 2021 03:57:47 -0400 Received: from mail-pg1-x532.google.com ([2607:f8b0:4864:20::532]:43308) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lLi6e-0004J9-AR for qemu-devel@nongnu.org; Mon, 15 Mar 2021 03:57:46 -0400 Received: by mail-pg1-x532.google.com with SMTP id n10so19977847pgl.10 for ; Mon, 15 Mar 2021 00:57:39 -0700 (PDT) Received: from i9-aorus-gtx1080.localdomain (144.168.56.201.16clouds.com. [144.168.56.201]) by smtp.gmail.com with ESMTPSA id y9sm10166745pja.50.2021.03.15.00.57.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Mar 2021 00:57:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=GoYz0zg2OAHB4zaizuLLFR6HQ9SymmyDjJ2jkSEyIQU=; b=mNBzb5/loB1pZZTKPlrYxSIUVCVhD6heoAMJRYceAUXCiLmDc7SpLRk3fy0ukDOscv /J78fSWUoU2MlgMbxk0DQgBnybewMefL1cEg45zBkcVBOrpxNCqKb6FM4GM5SkvE9leE rKJwL02v3Qxy9gQi+3+d2KgDAY06fY+ScJnhfQKDIfB0snnlExIW/r4dmFSamL5vGPoA rlM2tRnujOB8kM0YZUSBqr9iTDjVSedhngk1W0SkJ1rs/ZiI12wqef3c+gvkgNRus8O1 NK8Irhk3QrUv5Nnn9Pr3myy/+yH5bLhyWMxqxZBDJrI8b0UErCFk3JhP1tg8qEKMXIs4 PPng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=GoYz0zg2OAHB4zaizuLLFR6HQ9SymmyDjJ2jkSEyIQU=; b=JgO8C7h6IXOYNazAY3fq9aSNVBehwDBgy5m7XhSGQAAfmWF+V3XGF9n21qwJ3V+a0G 4RKQymQdChyRlE0wOVFRgAlyh9OxiF3+83+d9UzkjIaKUQMKhwRk6BXFHiV1u3Z1OdXu +yMpCWT4YGm3HxxrMI+YBvwSqxj4n4AjVdDjNQvGgSPJZaLoGfW3IBVsESawcNKxPKvc 5lT6Bo2vMycXkQsQXYuxuS1wHmtjB3ozfXLTfzwhsX+6osKoQ5wbYgNsuPMZTffXouno apgVO4B8AmXa6uKgqKdoioFIndLOYiKUaSNmLVT29q9REgne/ExFnBI+A1t+8spclgy2 mhLQ== X-Gm-Message-State: AOAM5335hydwnQULzquWg/vwg/MwQN4ZrWPIXIaXv4npDiMNu82MnZ4O NM9ODN+XVlxS7YbBGUsSBivUaN/Yp2g= X-Google-Smtp-Source: ABdhPJyIpyEGDyU/Zn9eqZB0xZF+zLXzhX41riGDwcDGX0K1IBpG0j0vB84JpSgPeFpkdZa/FnHNTQ== X-Received: by 2002:a62:e708:0:b029:1f8:c092:ff93 with SMTP id s8-20020a62e7080000b02901f8c092ff93mr9096491pfh.21.1615795059044; Mon, 15 Mar 2021 00:57:39 -0700 (PDT) From: Bin Meng To: Jason Wang , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Peter Maydell , qemu-devel@nongnu.org Subject: [PATCH v2 04/13] net: tap: Pad short frames to minimum size before send Date: Mon, 15 Mar 2021 15:57:09 +0800 Message-Id: <20210315075718.5402-5-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210315075718.5402-1-bmeng.cn@gmail.com> References: <20210315075718.5402-1-bmeng.cn@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::532; envelope-from=bmeng.cn@gmail.com; helo=mail-pg1-x532.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bin Meng Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) Content-Type: text/plain; charset="utf-8" Do the same for tap backend as what we did for slirp. Signed-off-by: Bin Meng --- net/tap-win32.c | 12 ++++++++++++ net/tap.c | 12 ++++++++++++ 2 files changed, 24 insertions(+) diff --git a/net/tap-win32.c b/net/tap-win32.c index 2b5dcda36e..ec35ab8ce7 100644 --- a/net/tap-win32.c +++ b/net/tap-win32.c @@ -31,6 +31,7 @@ =20 #include "qemu-common.h" #include "clients.h" /* net_init_tap */ +#include "net/eth.h" #include "net/net.h" #include "net/tap.h" /* tap_has_ufo, ... */ #include "qemu/error-report.h" @@ -688,9 +689,20 @@ static void tap_win32_send(void *opaque) uint8_t *buf; int max_size =3D 4096; int size; + uint8_t min_buf[ETH_ZLEN]; =20 size =3D tap_win32_read(s->handle, &buf, max_size); if (size > 0) { + if (!s->nc.peer->do_not_pad) { + /* Pad to minimum Ethernet frame length */ + if (size < ETH_ZLEN) { + memcpy(min_buf, buf, size); + memset(&min_buf[size], 0, ETH_ZLEN - size); + buf =3D min_buf; + size =3D ETH_ZLEN; + } + } + qemu_send_packet(&s->nc, buf, size); tap_win32_free_buffer(s->handle, buf); } diff --git a/net/tap.c b/net/tap.c index b7512853f4..f96b1ccfc0 100644 --- a/net/tap.c +++ b/net/tap.c @@ -32,6 +32,7 @@ #include #include =20 +#include "net/eth.h" #include "net/net.h" #include "clients.h" #include "monitor/monitor.h" @@ -189,6 +190,7 @@ static void tap_send(void *opaque) =20 while (true) { uint8_t *buf =3D s->buf; + uint8_t min_buf[ETH_ZLEN]; =20 size =3D tap_read_packet(s->fd, s->buf, sizeof(s->buf)); if (size <=3D 0) { @@ -200,6 +202,16 @@ static void tap_send(void *opaque) size -=3D s->host_vnet_hdr_len; } =20 + if (!s->nc.peer->do_not_pad) { + /* Pad to minimum Ethernet frame length */ + if (size < ETH_ZLEN) { + memcpy(min_buf, buf, size); + memset(&min_buf[size], 0, ETH_ZLEN - size); + buf =3D min_buf; + size =3D ETH_ZLEN; + } + } + size =3D qemu_send_packet_async(&s->nc, buf, size, tap_send_comple= ted); if (size =3D=3D 0) { tap_read_poll(s, false); --=20 2.25.1