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From: Max Gurtovoy <maxg@mellanox.com>
To: linux-nvme@lists.infradead.org, sagi@grimberg.me,
	linux-rdma@vger.kernel.org, kbusch@kernel.org, hch@lst.de,
	martin.petersen@oracle.com
Cc: axboe@kernel.dk, vladimirk@mellanox.com, shlomin@mellanox.com,
	israelr@mellanox.com, idanb@mellanox.com, maxg@mellanox.com
Subject: [PATCH 18/19] nvmet-rdma: Implement set_mdts controller op
Date: Mon, 24 Feb 2020 18:45:43 +0200
Message-ID: <20200224164544.219438-20-maxg@mellanox.com> (raw)
In-Reply-To: <20200224164544.219438-1-maxg@mellanox.com>

Set the maximal data transfer size according to device capabilities.
For example, for T10-DIF offload by supporting RDMA HCA, one uses
RDMA/rw API that limits the IO operation to use a single MR with 256
pages at the most. Limit the mdts according to RDMA/rw API and even
decrease it in order to avoid multiple splits by the local block layer
for large IOs to ease on the CPU on the target side.

Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
---
 drivers/nvme/target/rdma.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 37d262a..2227adf 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -30,6 +30,7 @@
 #define NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE	PAGE_SIZE
 #define NVMET_RDMA_MAX_INLINE_SGE		4
 #define NVMET_RDMA_MAX_INLINE_DATA_SIZE		max_t(int, SZ_16K, PAGE_SIZE)
+#define NVMET_RDMA_T10_PI_MDTS			5
 
 struct nvmet_rdma_cmd {
 	struct ib_sge		sge[NVMET_RDMA_MAX_INLINE_SGE + 1];
@@ -1602,6 +1603,21 @@ static void nvmet_rdma_disc_port_addr(struct nvmet_req *req,
 	}
 }
 
+static u8 nvmet_rdma_set_mdts(struct nvmet_ctrl *ctrl)
+{
+	struct nvmet_port *port = ctrl->port;
+	struct rdma_cm_id *cm_id = port->priv;
+	u32 max_pages;
+
+	if (ctrl->pi_support) {
+		max_pages = rdma_rw_fr_page_list_len(cm_id->device, true);
+		/* Assume mpsmin == device_page_size == 4KB */
+		return min(ilog2(max_pages), NVMET_RDMA_T10_PI_MDTS);
+	}
+
+	return 0;
+}
+
 static const struct nvmet_fabrics_ops nvmet_rdma_ops = {
 	.owner			= THIS_MODULE,
 	.type			= NVMF_TRTYPE_RDMA,
@@ -1612,6 +1628,7 @@ static void nvmet_rdma_disc_port_addr(struct nvmet_req *req,
 	.queue_response		= nvmet_rdma_queue_response,
 	.delete_ctrl		= nvmet_rdma_delete_ctrl,
 	.disc_traddr		= nvmet_rdma_disc_port_addr,
+	.set_mdts		= nvmet_rdma_set_mdts,
 };
 
 static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
-- 
1.8.3.1


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  parent reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24 16:45 [PATCH 00/19 V4] nvme-rdma/nvmet-rdma: Add metadata/T10-PI support Max Gurtovoy
2020-02-24 16:45 ` [PATCH] nvme-cli/fabrics: Add pi_enable param to connect cmd Max Gurtovoy
2020-02-24 16:45 ` [PATCH 01/19] nvme: Introduce namespace features flag Max Gurtovoy
2020-02-24 16:45 ` [PATCH 02/19] nvme: Add has_pi field to the nvme_req structure Max Gurtovoy
2020-02-24 16:45 ` [PATCH 03/19] nvme: Enforce extended LBA format for fabrics metadata Max Gurtovoy
2020-02-24 16:45 ` [PATCH 04/19] nvme: Introduce max_integrity_segments ctrl attribute Max Gurtovoy
2020-02-24 16:45 ` [PATCH 05/19] nvme-fabrics: Allow user enabling metadata/T10-PI support Max Gurtovoy
2020-02-24 16:45 ` [PATCH 06/19] nvme: Introduce NVME_INLINE_PROT_SG_CNT Max Gurtovoy
2020-02-24 16:45 ` [PATCH 07/19] nvme-rdma: Introduce nvme_rdma_sgl structure Max Gurtovoy
2020-02-24 16:45 ` [PATCH 08/19] nvme-rdma: Add metadata/T10-PI support Max Gurtovoy
2020-02-24 16:45 ` [PATCH 09/19] nvmet: Prepare metadata request Max Gurtovoy
2020-02-24 16:45 ` [PATCH 10/19] nvmet: Add metadata characteristics for a namespace Max Gurtovoy
2020-02-24 16:45 ` [PATCH 11/19] nvmet: Rename nvmet_rw_len to nvmet_rw_data_len Max Gurtovoy
2020-02-24 16:45 ` [PATCH 12/19] nvmet: Rename nvmet_check_data_len to nvmet_check_transfer_len Max Gurtovoy
2020-02-24 16:45 ` [PATCH 13/19] nvme: Add Metadata Capabilities enumerations Max Gurtovoy
2020-02-24 16:45 ` [PATCH 14/19] nvmet: Add mdts setting op for controllers Max Gurtovoy
2020-02-24 16:45 ` [PATCH 15/19] nvmet: Add metadata/T10-PI support Max Gurtovoy
2020-02-24 16:45 ` [PATCH 16/19] nvmet: Add metadata support for block devices Max Gurtovoy
2020-02-24 16:45 ` [PATCH 17/19] RDMA/rw: Expose maximal page list for a device per 1 MR Max Gurtovoy
2020-02-24 16:45 ` Max Gurtovoy [this message]
2020-02-24 16:45 ` [PATCH 19/19] nvmet-rdma: Add metadata/T10-PI support Max Gurtovoy
2020-02-24 18:13 ` [PATCH 00/19 V4] nvme-rdma/nvmet-rdma: " James Smart

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