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Mon, 24 Feb 2020 10:49:17 -0800 (PST) From: James Smart To: linux-nvme@lists.infradead.org Subject: [RFC 6/6] nvme: Introduce NVME_INLINE_PROT_SG_CNT Date: Mon, 24 Feb 2020 10:48:59 -0800 Message-Id: <20200224184859.20995-7-jsmart2021@gmail.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200224184859.20995-1-jsmart2021@gmail.com> References: <20200224184859.20995-1-jsmart2021@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200224_104921_736264_388E962F X-CRM114-Status: GOOD ( 11.67 ) 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: Israel Rukshin , James Smart MIME-Version: 1.0 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 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 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 in preparation for adding metadata (T10-PI) over fabric support. Signed-off-by: Israel Rukshin Reviewed-by: Max Gurtovoy Signed-off-by: James Smart --- Differences from Israel's original patch: Renamed NVME_INLINE_PROT_SG_CNT to NVME_INLINE_META_SG_CNT --- 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 bedee3fa9d41..d5fc3b9d9b77 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -31,8 +31,10 @@ extern unsigned int admin_timeout; #ifdef CONFIG_ARCH_NO_SG_CHAIN #define NVME_INLINE_SG_CNT 0 +#define NVME_INLINE_META_SG_CNT 0 #else #define NVME_INLINE_SG_CNT 2 +#define NVME_INLINE_META_SG_CNT 1 #endif extern struct workqueue_struct *nvme_wq; -- 2.16.4 _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme