[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 6 Jun 2016 23:20:47 +0200
From: Christoph Hellwig <hch@....de>
To: axboe@...nel.dk, keith.busch@...el.com
Cc: linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org,
James Smart <james.smart@...adcom.com>
Subject: [PATCH 05/10] nvme.h: add constants for PSDT and FUSE values
From: James Smart <james.smart@...adcom.com>
Signed-off-by: James Smart <james.smart@...adcom.com>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Christoph Hellwig <hch@....de>
---
include/linux/nvme.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index a9b8c7b..2b82f05 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -306,6 +306,29 @@ enum nvme_opcode {
nvme_cmd_resv_release = 0x15,
};
+/*
+ * Lowest two bits of our flags field (FUSE field in the spec):
+ *
+ * @NVME_CMD_FUSE_FIRST: Fused Operation, first command
+ * @NVME_CMD_FUSE_SECOND: Fused Operation, second command
+ *
+ * Highest two bits in our flags field (PSDT field in the spec):
+ *
+ * @NVME_CMD_PSDT_SGL_METABUF: Use SGLS for this transfer,
+ * If used, MPTR contains addr of single physical buffer (byte aligned).
+ * @NVME_CMD_PSDT_SGL_METASEG: Use SGLS for this transfer,
+ * If used, MPTR contains an address of an SGL segment containing
+ * exactly 1 SGL descriptor (qword aligned).
+ */
+enum {
+ NVME_CMD_FUSE_FIRST = (1 << 0),
+ NVME_CMD_FUSE_SECOND = (1 << 1),
+
+ NVME_CMD_SGL_METABUF = (1 << 6),
+ NVME_CMD_SGL_METASEG = (1 << 7),
+ NVME_CMD_SGL_ALL = NVME_CMD_SGL_METABUF | NVME_CMD_SGL_METASEG,
+};
+
struct nvme_common_command {
__u8 opcode;
__u8 flags;
--
2.1.4
Powered by blists - more mailing lists