From owner-svn-src-head@freebsd.org Mon Oct 31 05:05:14 2016 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 49554C278E0; Mon, 31 Oct 2016 05:05:14 +0000 (UTC) (envelope-from sephe@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id EF8DF1D28; Mon, 31 Oct 2016 05:05:13 +0000 (UTC) (envelope-from sephe@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u9V55D1e011554; Mon, 31 Oct 2016 05:05:13 GMT (envelope-from sephe@FreeBSD.org) Received: (from sephe@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id u9V55D4O011553; Mon, 31 Oct 2016 05:05:13 GMT (envelope-from sephe@FreeBSD.org) Message-Id: <201610310505.u9V55D4O011553@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: sephe set sender to sephe@FreeBSD.org using -f From: Sepherosa Ziehau Date: Mon, 31 Oct 2016 05:05:13 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r308119 - head/sys/dev/hyperv/netvsc X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 31 Oct 2016 05:05:14 -0000 Author: sephe Date: Mon Oct 31 05:05:12 2016 New Revision: 308119 URL: https://svnweb.freebsd.org/changeset/base/308119 Log: hyperv/hn: Reset do_lro, if the hash types are not TCP related. Mainly because the host side only set TCPCS and IPCS even for UDP datagrams. MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D8369 Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c ============================================================================== --- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Mon Oct 31 04:54:15 2016 (r308118) +++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c Mon Oct 31 05:05:12 2016 (r308119) @@ -1754,6 +1754,13 @@ hn_rxpkt(struct hn_rx_ring *rxr, const v rxr->hn_csum_udp++; } + /* + * XXX + * As of this write (Oct 28th, 2016), host side will turn + * on only TCPCS_OK and IPCS_OK even for UDP datagrams, so + * the do_lro setting here is actually _not_ accurate. We + * depend on the RSS hash type check to reset do_lro. + */ if ((info->csum_info & (NDIS_RXCSUM_INFO_TCPCS_OK | NDIS_RXCSUM_INFO_IPCS_OK)) == (NDIS_RXCSUM_INFO_TCPCS_OK | NDIS_RXCSUM_INFO_IPCS_OK)) @@ -1828,9 +1835,16 @@ skip: NDIS_HASH_FUNCTION_TOEPLITZ) { uint32_t type = (info->hash_info & NDIS_HASH_TYPE_MASK); + /* + * NOTE: + * do_lro is resetted, if the hash types are not TCP + * related. See the comment in the above csum_flags + * setup section. + */ switch (type) { case NDIS_HASH_IPV4: hash_type = M_HASHTYPE_RSS_IPV4; + do_lro = 0; break; case NDIS_HASH_TCP_IPV4: @@ -1839,10 +1853,12 @@ skip: case NDIS_HASH_IPV6: hash_type = M_HASHTYPE_RSS_IPV6; + do_lro = 0; break; case NDIS_HASH_IPV6_EX: hash_type = M_HASHTYPE_RSS_IPV6_EX; + do_lro = 0; break; case NDIS_HASH_TCP_IPV6: