[PATCH 6/6] nvme/fault-injection: Support for error injection with custom crd

[Sagi Grimberg]

This assumes that the controller exposed crdt[1,2,3] that are actually
meaningful in order to have make difference.

Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
---
 drivers/nvme/host/fault_inject.c | 8 ++++++--
 drivers/nvme/host/nvme.h         | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/fault_inject.c b/drivers/nvme/host/fault_inject.c
index 105d6cb41c72..98363fc6dde7 100644
--- a/drivers/nvme/host/fault_inject.c
+++ b/drivers/nvme/host/fault_inject.c
@@ -42,11 +42,13 @@ void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
 	}
 	fault_inj->parent = parent;
 
-	/* create debugfs for status code and dont_retry */
+	/* create debugfs for status code, dont_retry and crd */
 	fault_inj->status = NVME_SC_INVALID_OPCODE;
 	fault_inj->dont_retry = true;
+	fault_inj->crd = 0;
 	debugfs_create_x16("status", 0600, dir,	&fault_inj->status);
 	debugfs_create_bool("dont_retry", 0600, dir, &fault_inj->dont_retry);
+	debugfs_create_u8("crd", 0600, dir, &fault_inj->crd);
 }
 
 void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject)
@@ -73,10 +75,12 @@ void nvme_should_fail(struct request *req)
 	}
 
 	if (fault_inject && should_fail(&fault_inject->attr, 1)) {
-		/* inject status code and DNR bit */
+		/* inject status code, optional DNR and CRD */
 		status = fault_inject->status;
 		if (fault_inject->dont_retry)
 			status |= NVME_STATUS_DNR;
+		if (fault_inject->crd && fault_inject->crd <= 3)
+			status |= (fault_inject->crd << 11) & NVME_STATUS_CRD;
 		nvme_req(req)->status =	status;
 	}
 }
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index e63f21b3110c..9aa0fc5e473a 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -318,6 +318,7 @@ struct nvme_fault_inject {
 	struct fault_attr attr;
 	struct dentry *parent;
 	bool dont_retry;	/* DNR, do not retry */
+	u8 crd;			/* Command Retry Delay (0-3) */
 	u16 status;		/* status code */
 #endif
 };
-- 
2.43.0