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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 01F24C11D2F for ; Mon, 24 Feb 2020 16:46:40 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 BD36220637 for ; Mon, 24 Feb 2020 16:46:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="sj/O6/KC"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="vhg8X5Zt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BD36220637 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mellanox.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=i4PGgD3fyR90Kp0jAH0uXalBS1A64deZCDihJP8h61A=; b=sj/O6/KCj9JDF/ KotLJglBirStUJgZvSiskSG/9djBbySasMHfyCUy/xasrX5hq905K/DHKMnxqyCbAI+k/DDfQH7tQ 0Z6izJONIoNOqOUbanTdKlKpWpB+4ScphBQ++9hhBl8HMAN09JUmHGjp6naprJTlmWBAQeSmEl/1j yRO2C6lehwZ2EtEV7Nbq4yd0tOeczQihG4cg6eRHxjo5QeBn55WbCsvlGnachE30rLbHKizx2/vdo GY3jR81yC8o2cYCe2UNFIltLggkVeprDXTcz9X/88hWkjup0T1KA7inoMyffXLOxFS9TqtbSwV5rc 9Na17bSRZhe/eG8S60DA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j6GsO-0001s3-Am; Mon, 24 Feb 2020 16:46:36 +0000 Received: from merlin.infradead.org ([205.233.59.134]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j6Grn-0001Kh-0E for linux-nvme@bombadil.infradead.org; Mon, 24 Feb 2020 16:45:59 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=/0BwuQ1Ay9IttLRsdhBHfrMhxDgTNj74wxx6suo7WDg=; b=vhg8X5ZtLrW3+J2c9EOiBsNJfz nAQZnY48X/KBFRZJ9G+0usiI3LfCVYgbv8nETSoT5vu0a6lOr44eA4hCULaoldn/UW7jWw8sLFnbZ ul5ekkBPeXxUDIM2TZDhhVjllhhz3Py2uTInmc6sNVAYrsJ4hVBQ9Ni3cif0ZfuBt++7o5Ctdha+1 YrjHodDng1jw/GA3Fy9smb86k7tG4J0Z7HAQuQt+JpJmDSOOgmt96Yr9we2Z6SchStFoOg2NeDCLr JwLXwPPV9Ns74Cp5h12xyDRaFCYxWGZX49F2GyN1zOJzkGrUoI3BYNFhu/U6aKsSbzNU34MZ/9Cie e11kBhxA==; Received: from mail-il-dmz.mellanox.com ([193.47.165.129] helo=mellanox.co.il) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j6Grk-0002Dk-EE for linux-nvme@lists.infradead.org; Mon, 24 Feb 2020 16:45:58 +0000 Received: from Internal Mail-Server by MTLPINE2 (envelope-from maxg@mellanox.com) with ESMTPS (AES256-SHA encrypted); 24 Feb 2020 18:45:47 +0200 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 01OGji9d013647; Mon, 24 Feb 2020 18:45:47 +0200 From: Max Gurtovoy To: linux-nvme@lists.infradead.org, sagi@grimberg.me, linux-rdma@vger.kernel.org, kbusch@kernel.org, hch@lst.de, martin.petersen@oracle.com Subject: [PATCH 17/19] RDMA/rw: Expose maximal page list for a device per 1 MR Date: Mon, 24 Feb 2020 18:45:42 +0200 Message-Id: <20200224164544.219438-19-maxg@mellanox.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200224164544.219438-1-maxg@mellanox.com> References: <20200224164544.219438-1-maxg@mellanox.com> MIME-Version: 1.0 X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: axboe@kernel.dk, vladimirk@mellanox.com, shlomin@mellanox.com, israelr@mellanox.com, idanb@mellanox.com, maxg@mellanox.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org ULP's will use this information to determine the maximal data transfer size per IO operation. Signed-off-by: Max Gurtovoy --- drivers/infiniband/core/rw.c | 14 ++++++++++++-- include/rdma/rw.h | 1 + 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c index 4fad732..edc9bee 100644 --- a/drivers/infiniband/core/rw.c +++ b/drivers/infiniband/core/rw.c @@ -56,8 +56,17 @@ static inline bool rdma_rw_io_needs_mr(struct ib_device *dev, u8 port_num, return false; } -static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev, - bool pi_support) +/** + * rdma_rw_fr_page_list_len - return the max number of pages mapped by 1 MR + * @dev: RDMA device that will eventually create a PD for needed MRs + * @pi_support: Whether MRs will be created for protection information offload + * + * Returns the number of pages that one MR can map for RDMA operation by the + * given device. One can determine the maximal data size according to the + * result of this function, or chose using multiple MRs for the RDMA operation + * as well. + */ +u32 rdma_rw_fr_page_list_len(struct ib_device *dev, bool pi_support) { u32 max_pages; @@ -69,6 +78,7 @@ static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev, /* arbitrary limit to avoid allocating gigantic resources */ return min_t(u32, max_pages, 256); } +EXPORT_SYMBOL(rdma_rw_fr_page_list_len); static inline int rdma_rw_inv_key(struct rdma_rw_reg_ctx *reg) { diff --git a/include/rdma/rw.h b/include/rdma/rw.h index 6ad9dc8..a9bbda7 100644 --- a/include/rdma/rw.h +++ b/include/rdma/rw.h @@ -69,5 +69,6 @@ unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num, void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr); int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr); void rdma_rw_cleanup_mrs(struct ib_qp *qp); +u32 rdma_rw_fr_page_list_len(struct ib_device *dev, bool pi_support); #endif /* _RDMA_RW_H */ -- 1.8.3.1 _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme