[PATCH v3 09/10] nvme: add handling for app_tag

[Anuj Gupta <anuj20.g@samsung.com>]

From: Kanchan Joshi <joshi.k@samsung.com>

With user integrity buffer, there is a way to specify the app_tag.
Set the corresponding protocol specific flags and send the app_tag down.

Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
---
 drivers/nvme/host/core.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index d4c366df8f12..af6940ec6e3c 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -871,6 +871,13 @@ static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
 	return BLK_STS_OK;
 }
 
+static void nvme_set_app_tag(struct nvme_command *cmnd, u16 apptag)
+{
+	cmnd->rw.apptag = cpu_to_le16(apptag);
+	/* use 0xfff as mask so that apptag is used in entirety */
+	cmnd->rw.appmask = cpu_to_le16(0xffff);
+}
+
 static void nvme_set_ref_tag(struct nvme_ns *ns, struct nvme_command *cmnd,
 			      struct request *req)
 {
@@ -1010,6 +1017,11 @@ static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
 				control |= NVME_RW_APPEND_PIREMAP;
 			nvme_set_ref_tag(ns, cmnd, req);
 		}
+		if (bio_integrity_flagged(req->bio, BIP_CHECK_APPTAG)) {
+			control |= NVME_RW_PRINFO_PRCHK_APP;
+			nvme_set_app_tag(cmnd,
+					 bio_integrity(req->bio)->app_tag);
+		}
 	}
 
 	cmnd->rw.control = cpu_to_le16(control);
-- 
2.25.1