[PATCH V3 2/3] nvme: introduce acre flag in nvme_ctrl

[Minwoo Im]

Advanced Command Retry Enable (ACRE) flag is added in nvme_ctrl
instance to indicate that Set Features for Host Behavior Support with
ACRE enabled is whether successfully done or not during reset_work.

This flag will be used to decide to retry commands that fail or not in
the followed patch.

Signed-off-by: Minwoo Im <minwoo.im.dev at gmail.com>
---
 drivers/nvme/host/core.c | 6 ++++++
 drivers/nvme/host/nvme.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index a8cee380b3c0..a286e3422c61 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2498,6 +2498,8 @@ static int nvme_configure_acre(struct nvme_ctrl *ctrl)
 	struct nvme_feat_host_behavior *host;
 	int ret;
 
+	ctrl->acre = false;
+
 	/* Don't bother enabling the feature if retry delay is not reported */
 	if (!ctrl->crdt[0] && !ctrl->crdt[1] && !ctrl->crdt[2])
 		return 0;
@@ -2509,6 +2511,10 @@ static int nvme_configure_acre(struct nvme_ctrl *ctrl)
 	host->acre = NVME_ENABLE_ACRE;
 	ret = nvme_set_features(ctrl, NVME_FEAT_HOST_BEHAVIOR, 0,
 				host, sizeof(*host), NULL);
+
+	if (!ret)
+		ctrl->acre = true;
+
 	kfree(host);
 	return ret;
 }
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 88a6b97247f5..db8b45e8ffde 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -270,6 +270,7 @@ struct nvme_ctrl {
 #ifdef CONFIG_BLK_DEV_ZONED
 	u32 max_zone_append;
 #endif
+	bool acre;
 	u16 crdt[3];
 	u16 oncs;
 	u16 oacs;
-- 
2.17.1