From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6EF79C433E0 for ; Thu, 18 Jun 2020 01:09:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E84021D7E for ; Thu, 18 Jun 2020 01:09:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592442592; bh=FDpuhwIPKqTLeXCeJvNbdgB/8fO5E50d3SbB8nIMSsU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lLwCDjLkRiLxak+1nlkcwxVDwOCVhnooHQzPVxemMJCNGpKlomuTLPplRzakvZPOt IDnZguCKSGp9CbRH2Yvd5Mtib5tsjg+V3Pvxek2pCJ4fgoGeL0XgR0lmdTTIeRHSfF 0ojEh0pCEuYwNY3yJW3qRwt0kvpHCVNpJmUrrj7o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728324AbgFRBJv (ORCPT ); Wed, 17 Jun 2020 21:09:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:36516 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728283AbgFRBJr (ORCPT ); Wed, 17 Jun 2020 21:09:47 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DE29221D7A; Thu, 18 Jun 2020 01:09:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592442587; bh=FDpuhwIPKqTLeXCeJvNbdgB/8fO5E50d3SbB8nIMSsU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eO5HBc6fiVpzaUtjPohBuoEnGn7jVV04d1lkYbAWN6I4OsVRpv+68G9P9/I4LeOHL kXs3bdjYP5D7lxnfzJgFjmiI/50Azvw5GN6soU7phWkJOFOL8tv/Z4PWRKn1LmC/pl XLtIazZHqDTv6lLkj0lYdNFB6Nu0EtG6UQOCOVF4= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sudhakar Panneerselvam , "Michael S . Tsirkin" , Jason Wang , Paolo Bonzini , Stefan Hajnoczi , Mike Christie , "Martin K . Petersen" , Sasha Levin , virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.7 077/388] scsi: vhost: Notify TCM about the maximum sg entries supported per command Date: Wed, 17 Jun 2020 21:02:54 -0400 Message-Id: <20200618010805.600873-77-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200618010805.600873-1-sashal@kernel.org> References: <20200618010805.600873-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sudhakar Panneerselvam [ Upstream commit 5ae6a6a915033bfee79e76e0c374d4f927909edc ] vhost-scsi pre-allocates the maximum sg entries per command and if a command requires more than VHOST_SCSI_PREALLOC_SGLS entries, then that command is failed by it. This patch lets vhost communicate the max sg limit when it registers vhost_scsi_ops with TCM. With this change, TCM would report the max sg entries through "Block Limits" VPD page which will be typically queried by the SCSI initiator during device discovery. By knowing this limit, the initiator could ensure the maximum transfer length is less than or equal to what is reported by vhost-scsi. Link: https://lore.kernel.org/r/1590166317-953-1-git-send-email-sudhakar.panneerselvam@oracle.com Cc: Michael S. Tsirkin Cc: Jason Wang Cc: Paolo Bonzini Cc: Stefan Hajnoczi Reviewed-by: Mike Christie Signed-off-by: Sudhakar Panneerselvam Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/vhost/scsi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index c39952243fd3..8b104f76f324 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -2280,6 +2280,7 @@ static struct configfs_attribute *vhost_scsi_wwn_attrs[] = { static const struct target_core_fabric_ops vhost_scsi_ops = { .module = THIS_MODULE, .fabric_name = "vhost", + .max_data_sg_nents = VHOST_SCSI_PREALLOC_SGLS, .tpg_get_wwn = vhost_scsi_get_fabric_wwn, .tpg_get_tag = vhost_scsi_get_tpgt, .tpg_check_demo_mode = vhost_scsi_check_true, -- 2.25.1