From patchwork Thu Feb 27 21:08:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Simmons X-Patchwork-Id: 11409753 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 23F3A159A for ; Thu, 27 Feb 2020 21:21:21 +0000 (UTC) Received: from pdx1-mailman02.dreamhost.com (pdx1-mailman02.dreamhost.com [64.90.62.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0966D246A1 for ; Thu, 27 Feb 2020 21:21:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0966D246A1 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lustre-devel-bounces@lists.lustre.org Received: from pdx1-mailman02.dreamhost.com (localhost [IPv6:::1]) by pdx1-mailman02.dreamhost.com (Postfix) with ESMTP id A072A21FD8A; Thu, 27 Feb 2020 13:20:14 -0800 (PST) X-Original-To: lustre-devel@lists.lustre.org Delivered-To: lustre-devel-lustre.org@pdx1-mailman02.dreamhost.com Received: from smtp3.ccs.ornl.gov (smtp3.ccs.ornl.gov [160.91.203.39]) by pdx1-mailman02.dreamhost.com (Postfix) with ESMTP id A8F9521FA65 for ; Thu, 27 Feb 2020 13:18:33 -0800 (PST) Received: from star.ccs.ornl.gov (star.ccs.ornl.gov [160.91.202.134]) by smtp3.ccs.ornl.gov (Postfix) with ESMTP id E5DB0E27; Thu, 27 Feb 2020 16:18:13 -0500 (EST) Received: by star.ccs.ornl.gov (Postfix, from userid 2004) id E4381468; Thu, 27 Feb 2020 16:18:13 -0500 (EST) From: James Simmons To: Andreas Dilger , Oleg Drokin , NeilBrown Date: Thu, 27 Feb 2020 16:08:48 -0500 Message-Id: <1582838290-17243-61-git-send-email-jsimmons@infradead.org> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1582838290-17243-1-git-send-email-jsimmons@infradead.org> References: <1582838290-17243-1-git-send-email-jsimmons@infradead.org> Subject: [lustre-devel] [PATCH 060/622] lnet: ko2iblnd: determine gaps correctly X-BeenThere: lustre-devel@lists.lustre.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "For discussing Lustre software development." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Amir Shehata , Lustre Development List MIME-Version: 1.0 Errors-To: lustre-devel-bounces@lists.lustre.org Sender: "lustre-devel" From: Amir Shehata We're allowed to start at a non-aligned page offset in the first fragment and end at a non-aligned page offset in the last fragment. When checking the iovec exclude both of the first and last fragments from the tx_gaps check. WC-bug-id: https://jira.whamcloud.com/browse/LU-11064 Lustre-commit: e40ea6fd4494 ("LU-11064 lnd: determine gaps correctly") Signed-off-by: Amir Shehata Reviewed-on: https://review.whamcloud.com/32586 Reviewed-by: Doug Oucharek Reviewed-by: James Simmons Reviewed-by: Oleg Drokin Signed-off-by: James Simmons --- net/lnet/klnds/o2iblnd/o2iblnd_cb.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/net/lnet/klnds/o2iblnd/o2iblnd_cb.c b/net/lnet/klnds/o2iblnd/o2iblnd_cb.c index c2ce3b9..60706b4 100644 --- a/net/lnet/klnds/o2iblnd/o2iblnd_cb.c +++ b/net/lnet/klnds/o2iblnd/o2iblnd_cb.c @@ -737,6 +737,7 @@ static int kiblnd_map_tx(struct lnet_ni *ni, struct kib_tx *tx, struct kib_net *net = ni->ni_data; struct scatterlist *sg; int fragnob; + int max_nkiov; CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob); @@ -751,16 +752,24 @@ static int kiblnd_map_tx(struct lnet_ni *ni, struct kib_tx *tx, LASSERT(nkiov > 0); } + max_nkiov = nkiov; + sg = tx->tx_frags; do { LASSERT(nkiov > 0); fragnob = min((int)(kiov->bv_len - offset), nob); - if ((fragnob < (int)(kiov->bv_len - offset)) && nkiov > 1) { + /* We're allowed to start at a non-aligned page offset in + * the first fragment and end at a non-aligned page offset + * in the last fragment. + */ + if ((fragnob < (int)(kiov->bv_len - offset)) && + nkiov < max_nkiov && nob > fragnob) { CDEBUG(D_NET, - "fragnob %d < available page %d: with remaining %d kiovs\n", - fragnob, (int)(kiov->bv_len - offset), nkiov); + "fragnob %d < available page %d: with remaining %d kiovs with %d nob left\n", + fragnob, (int)(kiov->bv_len - offset), + nkiov, nob); tx->tx_gaps = true; }