From patchwork Fri Mar 27 17:15:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Gurtovoy X-Patchwork-Id: 11462781 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 12134161F for ; Fri, 27 Mar 2020 17:15:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E62C720714 for ; Fri, 27 Mar 2020 17:15:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727352AbgC0RP6 (ORCPT ); Fri, 27 Mar 2020 13:15:58 -0400 Received: from mail-il-dmz.mellanox.com ([193.47.165.129]:51209 "EHLO mellanox.co.il" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727636AbgC0RPw (ORCPT ); Fri, 27 Mar 2020 13:15:52 -0400 Received: from Internal Mail-Server by MTLPINE2 (envelope-from maxg@mellanox.com) with ESMTPS (AES256-SHA encrypted); 27 Mar 2020 20:15:47 +0300 Received: from mtr-vdi-031.wap.labs.mlnx. (mtr-vdi-031.wap.labs.mlnx [10.209.102.136]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 02RHFjj9004869; Fri, 27 Mar 2020 20:15:46 +0300 From: Max Gurtovoy To: linux-nvme@lists.infradead.org, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, martin.petersen@oracle.com, jsmart2021@gmail.com, linux-rdma@vger.kernel.org Cc: idanb@mellanox.com, axboe@kernel.dk, maxg@mellanox.com, vladimirk@mellanox.com, oren@mellanox.com, shlomin@mellanox.com, israelr@mellanox.com, jgg@mellanox.com Subject: [PATCH 06/17] nvme: introduce NVME_INLINE_MD_SG_CNT Date: Fri, 27 Mar 2020 20:15:34 +0300 Message-Id: <20200327171545.98970-8-maxg@mellanox.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200327171545.98970-1-maxg@mellanox.com> References: <20200327171545.98970-1-maxg@mellanox.com> MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Israel Rukshin SGL size of metadata is usually small. Thus, 1 inline sg should cover most cases. The macro will be used for pre-allocate a single SGL entry for metadata. The preallocation of small inline SGLs depends on SG_CHAIN capability so if the ARCH doesn't support SG_CHAIN, use the runtime allocation for the SGL. This patch is a preparation for adding metadata (T10-PI) over fabric support. Signed-off-by: Israel Rukshin Signed-off-by: Max Gurtovoy Reviewed-by: Martin K. Petersen Reviewed-by: Christoph Hellwig --- drivers/nvme/host/nvme.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index d132af9..08f470d 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -30,8 +30,10 @@ #ifdef CONFIG_ARCH_NO_SG_CHAIN #define NVME_INLINE_SG_CNT 0 +#define NVME_INLINE_MD_SG_CNT 0 #else #define NVME_INLINE_SG_CNT 2 +#define NVME_INLINE_MD_SG_CNT 1 #endif extern struct workqueue_struct *nvme_wq;