[PATCH 05/19] nvme-fabrics: Allow user enabling metadata/T10-PI support

[Max Gurtovoy <maxg@xxxxxxxxxxxx>]

From: Israel Rukshin <israelr@xxxxxxxxxxxx>

Preparation for adding metadata (T10-PI) over fabric support. This will
allow end-to-end protection information passthrough and validation for
NVMe over Fabric.

Signed-off-by: Israel Rukshin <israelr@xxxxxxxxxxxx>
Reviewed-by: Max Gurtovoy <maxg@xxxxxxxxxxxx>
---
 drivers/nvme/host/core.c    |  3 ++-
 drivers/nvme/host/fabrics.c | 11 +++++++++++
 drivers/nvme/host/fabrics.h |  3 +++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ab25128..c7933a8 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1869,7 +1869,8 @@ static int __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
 		 * controller.
 		 */
 		if (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED) {
-			if (ns->ctrl->ops->flags & NVME_F_FABRICS ||
+			if ((ns->ctrl->ops->flags & NVME_F_FABRICS &&
+			     ns->ctrl->opts->pi_enable) ||
 			    !(ns->features & NVME_NS_EXT_LBAS))
 				ns->features |= NVME_NS_MD_HOST_SUPPORTED;
 		}
diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 74b8818..c09230e 100644
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -612,6 +612,7 @@ bool __nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
 	{ NVMF_OPT_NR_WRITE_QUEUES,	"nr_write_queues=%d"	},
 	{ NVMF_OPT_NR_POLL_QUEUES,	"nr_poll_queues=%d"	},
 	{ NVMF_OPT_TOS,			"tos=%d"		},
+	{ NVMF_OPT_PI_ENABLE,		"pi_enable"		},
 	{ NVMF_OPT_ERR,			NULL			}
 };
 
@@ -634,6 +635,7 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 	opts->hdr_digest = false;
 	opts->data_digest = false;
 	opts->tos = -1; /* < 0 == use transport default */
+	opts->pi_enable = false;
 
 	options = o = kstrdup(buf, GFP_KERNEL);
 	if (!options)
@@ -867,6 +869,15 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
 			}
 			opts->tos = token;
 			break;
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+		case NVMF_OPT_PI_ENABLE:
+			if (opts->discovery_nqn) {
+				pr_debug("Ignoring pi_enable value for discovery controller\n");
+				break;
+			}
+			opts->pi_enable = true;
+			break;
+#endif
 		default:
 			pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n",
 				p);
diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h
index a0ec40a..773f748 100644
--- a/drivers/nvme/host/fabrics.h
+++ b/drivers/nvme/host/fabrics.h
@@ -56,6 +56,7 @@ enum {
 	NVMF_OPT_NR_WRITE_QUEUES = 1 << 17,
 	NVMF_OPT_NR_POLL_QUEUES = 1 << 18,
 	NVMF_OPT_TOS		= 1 << 19,
+	NVMF_OPT_PI_ENABLE	= 1 << 20,
 };
 
 /**
@@ -89,6 +90,7 @@ enum {
  * @nr_write_queues: number of queues for write I/O
  * @nr_poll_queues: number of queues for polling I/O
  * @tos: type of service
+ * @pi_enable: Enable metadata (T10-PI) support
  */
 struct nvmf_ctrl_options {
 	unsigned		mask;
@@ -111,6 +113,7 @@ struct nvmf_ctrl_options {
 	unsigned int		nr_write_queues;
 	unsigned int		nr_poll_queues;
 	int			tos;
+	bool			pi_enable;
 };
 
 /*
-- 
1.8.3.1