From nobody Sun Nov 07 07:51:30 2021 X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 9429718452D9; Sun, 7 Nov 2021 07:51:35 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: from mail-lj1-x233.google.com (mail-lj1-x233.google.com [IPv6:2a00:1450:4864:20::233]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Hn5zV494Zz4hcn; Sun, 7 Nov 2021 07:51:34 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: by mail-lj1-x233.google.com with SMTP id t11so23097024ljh.6; Sun, 07 Nov 2021 00:51:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:date:to:cc:subject:message-id:mime-version :content-transfer-encoding; bh=bRnv5ofeALNBcZwXgRYJWQLLIBN3ngVABUdQAdt42eQ=; b=n0N/zHrEeUyGDkN7Apr+CFyXEncGaOiLOtE84otKHV+bMcu9LBsS/Dx8MnqxCX7br2 Qf430KcbNYLuaUs1dxtX4q6ByspmvcovQFDUAennj/CJmLjxU7kDbJu2QxchBmCbc0Jm qRV0H054CmhPKvlhg74o5LTrKQdTJIMJytp343b705XyuhM5bvf4TuYTX3ld7PL99POr IrtyPAUvDZoTyy6XrZ2gTicnRIAhV2TgqGrJIyeWW8bo9IIs1ouwYVI1KdGYbofAN7SB myWpkbdhVZZzkAjjXczWb8Dj2k9F27Q3UkxG3DeXiB/dhhMPnMo2lwe3jnzE+Mn5ZDhN byOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:date:to:cc:subject:message-id:mime-version :content-transfer-encoding; bh=bRnv5ofeALNBcZwXgRYJWQLLIBN3ngVABUdQAdt42eQ=; b=QLsugcRolWHtj/PmW6b03e9TjjxizuGEECwCdIMC330YEotVBJvtllTJjHapKYzpKF jjSdNKWuRfOXsGCo3skik6ZM+/aoTAm2dEg+F0CLzWEV5fBGqRbg3VFNp/6HzacWLqxo rNf1ckp/ydPv6ajBaRKgP/8CvhNu4FBBS5DAKVdNhzoFrabtVftzJFaNmoioMC+qtBGx 9gTxDWQT2A0TTMO8jWT/HEltsV3N25MRSV6unbKijHw9Y7S4XT9zk8hIPkWDFowcozls iBXMw7BOir9sc3M+G9C6Sgq/6TvhYB4CipyhubuKUGxZmnzFbJr9kYCZ+z4rrBuhD3+q SbUA== X-Gm-Message-State: AOAM5316HOuyEj1DDm7tDRHz7YcgYCPuRKDtWitxqEouPLqwC9D1Ksxh tRe7kUfsAxHOr9EsOzsilN53TSonFxE= X-Google-Smtp-Source: ABdhPJx8D9pZLZQUvMEgMLakmof6YMSvS7+1OOYRKPe3IV+ol+ZNzt7wtBPaOoEpVYzg/Cf8gT9k3Q== X-Received: by 2002:a2e:7216:: with SMTP id n22mr16939972ljc.452.1636271492576; Sun, 07 Nov 2021 00:51:32 -0700 (PDT) Received: from rimwks.local ([2001:470:1f15:3d8:264b:feff:fe8d:cea8]) by smtp.gmail.com with ESMTPSA id b39sm1235617ljf.52.2021.11.07.00.51.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 07 Nov 2021 00:51:32 -0700 (PDT) From: Rozhuk Ivan X-Google-Original-From: Rozhuk Ivan Date: Sun, 7 Nov 2021 10:51:30 +0300 To: freebsd-net@freebsd.org, freebsd-hackers@FreeBSD.org Cc: Rozhuk Ivan Subject: if_vlan allow to set incorrect mtu Message-ID: <20211107105130.2ccbb253@rimwks.local> X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; amd64-portbld-freebsd13.0) List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4Hn5zV494Zz4hcn X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b="n0N/zHrE"; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of rozhukim@gmail.com designates 2a00:1450:4864:20::233 as permitted sender) smtp.mailfrom=rozhukim@gmail.com X-Spamd-Result: default: False [-1.99 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-0.99)[-0.993]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; TAGGED_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_HAM_LONG(-1.00)[-1.000]; TAGGED_RCPT(0.00)[]; MIME_GOOD(-0.10)[text/plain]; NEURAL_SPAM_MEDIUM(1.00)[1.000]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::233:from]; FREEMAIL_CC(0.00)[gmail.com]; RCVD_TLS_ALL(0.00)[] X-ThisMailContainsUnwantedMimeParts: N Hi! Why if_vlan allow to set same MTU size or bigger as on parrent nic? Setup: - workstation with MTU 9000 and IPv4 on h/w nic - server with MTU 9000 on h/w nic and IPv4 on vlan nic with MTU 9000 (set by defauil on iface creation) This setup have issue: - big packets from server->wks - OK - big packets from wks->server - FAIL. Server init sequence: 1. Create vlans 2. Set MTU lower than default on parent nic Result: vlan have bigger or same MTU as parrent nic, but parrent nic reports IFCAP_VLAN_MTU. Probably this is if_em driver issue or iflib. This is rc.conf, vlan77 - where I got MTU 9000 and fail to receive packets: ===================================================================================== vlans_igb0="vlan77 vlan86 vlan87" create_args_vlan87="vlan 87" create_args_vlan86="vlan 86" create_args_vlan77="vlan 77" ifconfig_vlan87="inet 15.44.77.2 netmask 255.255.252.0 mtu 1500 down up" ifconfig_vlan87_alias0="link 00:aa:fa:dd:44:55" ifconfig_vlan86="DHCP mtu 1500" ifconfig_vlan86_alias0="link 00:ff:fa:dd:44:55" ifconfig_vlan77="inet 192.168.0.254 netmask 255.255.255.0" ifconfig_vlan77_alias0="link 00:0f:43:48:67:fe" ifconfig_vlan77_ipv6="inet6 2001:470:2345:555::1/64 prefixlen 64 auto_linklocal" ifconfig_igb0="-lro -tso -vlanhwtso mtu 9000 down up" =====================================================================================