From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch updates nvmet_execute_identify_ns() to report
target-core backend T10-PI related feature bits to the
NVMe host controller.
Note this assumes support for NVME_NS_DPC_PI_TYPE1 and
NVME_NS_DPC_PI_TYPE3 as reported by backend drivers via
/sys/kernel/config/target/core/*/*/attrib/pi_prot_type.
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Martin Petersen <martin.petersen@xxxxxxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Mike Christie <michaelc@xxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/nvme/target/admin-cmd.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index 240e323..3a808dc 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -200,6 +200,7 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
{
struct nvmet_ns *ns;
struct nvme_id_ns *id;
+ struct se_device *dev;
u16 status = 0;
ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
@@ -228,6 +229,22 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req)
id->nlbaf = 0;
id->flbas = 0;
+ /* Populate bits for T10-PI from se_device backend */
+ rcu_read_lock();
+ dev = rcu_dereference(ns->dev);
+ if (dev && dev->dev_attrib.pi_prot_type) {
+ int pi_prot_type = dev->dev_attrib.pi_prot_type;
+
+ id->lbaf[0].ms = cpu_to_le16(sizeof(struct t10_pi_tuple));
+ printk("nvmet_set_id_ns: ms: %u\n", id->lbaf[0].ms);
+
+ if (pi_prot_type == 1)
+ id->dps = NVME_NS_DPC_PI_TYPE1;
+ else if (pi_prot_type == 3)
+ id->dps = NVME_NS_DPC_PI_TYPE3;
+ }
+ rcu_read_unlock();
+
/*
* Our namespace might always be shared. Not just with other
* controllers, but also with any other user of the block device.
--
1.9.1
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