From patchwork Tue Mar 28 15:09:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 13191210 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57FD4C6FD18 for ; Tue, 28 Mar 2023 15:17:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230128AbjC1PR5 (ORCPT ); Tue, 28 Mar 2023 11:17:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55000 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233948AbjC1PRi (ORCPT ); Tue, 28 Mar 2023 11:17:38 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78445113FA for ; Tue, 28 Mar 2023 08:16:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1680016512; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=a+LP/eGObxESjSZtnTg8CVLgYRu7HZvCpWjJZDO48e4=; b=GoIFc5YHToV4SfwBbznyQN2nXQe0Hcy3c8XJKRl5JaYXRl5BttVh8pP/yCQDM/6Ar+Bn62 iriiEV0qp++leiHTZ8oSAKdn+hx4ScUpQmaNDWx57Gk5td38yXDWubKG3k/dp6/d3BoJ/q rxVQbp55LFI07oXdJVNnF2YBzwx4bNc= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-495-MWpvJGt3PZ2YlU4lp9woSA-1; Tue, 28 Mar 2023 11:11:58 -0400 X-MC-Unique: MWpvJGt3PZ2YlU4lp9woSA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6D7218028B2; Tue, 28 Mar 2023 15:11:57 +0000 (UTC) Received: from localhost (ovpn-8-20.pek2.redhat.com [10.72.8.20]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6355314171BD; Tue, 28 Mar 2023 15:11:56 +0000 (UTC) From: Ming Lei To: Jens Axboe , io-uring@vger.kernel.org, linux-block@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Miklos Szeredi , ZiyangZhang , Xiaoguang Wang , Bernd Schubert , Pavel Begunkov , Stefan Hajnoczi , Dan Williams , Ming Lei Subject: [PATCH V5 15/16] block: ublk_drv: don't check buffer in case of zero copy Date: Tue, 28 Mar 2023 23:09:57 +0800 Message-Id: <20230328150958.1253547-16-ming.lei@redhat.com> In-Reply-To: <20230328150958.1253547-1-ming.lei@redhat.com> References: <20230328150958.1253547-1-ming.lei@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org In case of zero copy, ublk server needn't to pre-allocate IO buffer and provide it to driver more. Meantime not set the buffer in case of zero copy any more, and the userspace can use pread()/pwrite() to read from/write to the io request buffer, which is easier & simpler from userspace viewpoint. Signed-off-by: Ming Lei --- drivers/block/ublk_drv.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 03ad33686808..a49b4de5ae1e 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -1410,25 +1410,30 @@ static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags) if (io->flags & UBLK_IO_FLAG_OWNED_BY_SRV) goto out; /* FETCH_RQ has to provide IO buffer if NEED GET DATA is not enabled */ - if (!ub_cmd->addr && !ublk_need_get_data(ubq)) - goto out; + if (!ublk_support_zc(ubq)) { + if (!ub_cmd->addr && !ublk_need_get_data(ubq)) + goto out; + io->addr = ub_cmd->addr; + } io->cmd = cmd; io->flags |= UBLK_IO_FLAG_ACTIVE; - io->addr = ub_cmd->addr; - ublk_mark_io_ready(ub, ubq); break; case UBLK_IO_COMMIT_AND_FETCH_REQ: req = blk_mq_tag_to_rq(ub->tag_set.tags[ub_cmd->q_id], tag); + + if (!(io->flags & UBLK_IO_FLAG_OWNED_BY_SRV)) + goto out; /* * COMMIT_AND_FETCH_REQ has to provide IO buffer if NEED GET DATA is * not enabled or it is Read IO. */ - if (!ub_cmd->addr && (!ublk_need_get_data(ubq) || req_op(req) == REQ_OP_READ)) - goto out; - if (!(io->flags & UBLK_IO_FLAG_OWNED_BY_SRV)) - goto out; - io->addr = ub_cmd->addr; + if (!ublk_support_zc(ubq)) { + if (!ub_cmd->addr && (!ublk_need_get_data(ubq) || + req_op(req) == REQ_OP_READ)) + goto out; + io->addr = ub_cmd->addr; + } io->flags |= UBLK_IO_FLAG_ACTIVE; io->cmd = cmd; ublk_commit_completion(ub, ub_cmd);