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From: Max Gurtovoy <maxg@mellanox.com>
To: linux-nvme@lists.infradead.org, kbusch@kernel.org, hch@lst.de,
	sagi@grimberg.me, martin.petersen@oracle.com
Cc: axboe@kernel.dk, vladimirk@mellanox.com, shlomin@mellanox.com,
	israelr@mellanox.com, idanb@mellanox.com, oren@mellanox.com,
	maxg@mellanox.com
Subject: [PATCH 05/16] nvme: Introduce NVME_INLINE_PROT_SG_CNT
Date: Mon,  2 Dec 2019 16:48:01 +0200
Message-ID: <20191202144812.147686-7-maxg@mellanox.com> (raw)
In-Reply-To: <20191202144812.147686-1-maxg@mellanox.com>

From: Israel Rukshin <israelr@mellanox.com>

SGL size of PI 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 protection information. 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 <israelr@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
---
 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 0f8aacff3542..5c94fcfdd605 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -30,8 +30,10 @@ extern unsigned int admin_timeout;
 
 #ifdef CONFIG_ARCH_NO_SG_CHAIN
 #define  NVME_INLINE_SG_CNT  0
+#define  NVME_INLINE_PROT_SG_CNT  0
 #else
 #define  NVME_INLINE_SG_CNT  2
+#define  NVME_INLINE_PROT_SG_CNT  1
 #endif
 
 extern struct workqueue_struct *nvme_wq;
-- 
2.16.3


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  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-02 14:47 [PATCH 00/16 V2] nvme-rdma/nvmet-rdma: Add metadata/T10-PI support Max Gurtovoy
2019-12-02 14:47 ` [PATCH] nvme-cli/fabrics: Add pi_enable param to connect cmd Max Gurtovoy
2019-12-02 14:47 ` [PATCH 01/16] nvme: Introduce namespace features flag Max Gurtovoy
2019-12-04  8:41   ` Christoph Hellwig
2019-12-02 14:47 ` [PATCH 02/16] nvme: Enforce extended LBA format for fabrics metadata Max Gurtovoy
2019-12-02 14:47 ` [PATCH 03/16] nvme: Introduce max_integrity_segments ctrl attribute Max Gurtovoy
2019-12-02 14:48 ` [PATCH 04/16] nvme-fabrics: Allow user enabling metadata/T10-PI support Max Gurtovoy
2019-12-02 14:48 ` Max Gurtovoy [this message]
2019-12-02 14:48 ` [PATCH 06/16] nvme-rdma: Introduce nvme_rdma_sgl structure Max Gurtovoy
2019-12-02 14:48 ` [PATCH 07/16] nvme-rdma: Add metadata/T10-PI support Max Gurtovoy
2020-01-22 21:57   ` James Smart
2020-01-23  9:59     ` Max Gurtovoy
2020-01-23 15:34       ` James Smart
2020-01-23 18:52         ` James Smart
2019-12-02 14:48 ` [PATCH 08/16] block: Add a BIP_MAPPED_INTEGRITY check to complete_fn Max Gurtovoy
2019-12-02 14:48 ` [PATCH 09/16] nvmet: Prepare metadata request Max Gurtovoy
2019-12-02 14:48 ` [PATCH 10/16] nvmet: Add metadata characteristics for a namespace Max Gurtovoy
2019-12-02 14:48 ` [PATCH 11/16] nvmet: Rename nvmet_rw_len to nvmet_rw_data_len Max Gurtovoy
2019-12-02 14:48 ` [PATCH 12/16] nvmet: Rename nvmet_check_data_len to nvmet_check_transfer_len Max Gurtovoy
2019-12-02 14:48 ` [PATCH 13/16] nvme: Add Metadata Capabilities enumerations Max Gurtovoy
2019-12-02 14:48 ` [PATCH 14/16] nvmet: Add metadata/T10-PI support Max Gurtovoy
2019-12-02 14:48 ` [PATCH 15/16] nvmet: Add metadata support for block devices Max Gurtovoy
2019-12-02 14:48 ` [PATCH 16/16] nvmet-rdma: Add metadata/T10-PI support Max Gurtovoy

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