[PATCH 09/11] nvme: add nvme_noretry_error()

[hare@kernel.org]

From: Hannes Reinecke <hare@suse.de>

Add helper function to check if an error status should be retried
or not.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/nvme/host/core.c |  2 +-
 drivers/nvme/host/fc.c   |  4 ++--
 drivers/nvme/host/nvme.h | 10 ++++++++++
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 50818dbcfa1a..8212e55962e8 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3776,7 +3776,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_info *info)
 	 *
 	 * TODO: we should probably schedule a delayed retry here.
 	 */
-	if (ret > 0 && (ret & NVME_SC_DNR))
+	if (nvme_noretry_error(ret))
 		nvme_ns_remove(ns);
 }
 
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 05c3159d42e9..8732ebc402a7 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3326,7 +3326,7 @@ nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status)
 		dev_info(ctrl->ctrl.device,
 			"NVME-FC{%d}: reset: Reconnect attempt failed (%d)\n",
 			ctrl->cnum, status);
-		if (status > 0 && (status & NVME_SC_DNR))
+		if (nvme_noretry_error(status))
 			recon = false;
 	} else if (time_after_eq(jiffies, rport->dev_loss_end))
 		recon = false;
@@ -3343,7 +3343,7 @@ nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status)
 		queue_delayed_work(nvme_wq, &ctrl->connect_work, recon_delay);
 	} else {
 		if (portptr->port_state == FC_OBJSTATE_ONLINE) {
-			if (status > 0 && (status & NVME_SC_DNR))
+			if (nvme_noretry_error(status))
 				dev_warn(ctrl->ctrl.device,
 					 "NVME-FC{%d}: reconnect failure\n",
 					 ctrl->cnum);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 6092cc361837..378d5c6cc851 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -688,6 +688,16 @@ static inline bool nvme_is_path_error(u16 status)
 	return (status & 0x700) == 0x300;
 }
 
+/*
+ * Negative error codes are assumed to be transport errors
+ * and should be retried, positive error codes are NVMe
+ * status codes which should be retried if DNR is not set.
+ */
+static inline bool nvme_noretry_error(int error)
+{
+	return (error > 0 && (error & NVME_SC_DNR));
+}
+
 /*
  * Fill in the status and result information from the CQE, and then figure out
  * if blk-mq will need to use IPI magic to complete the request, and if yes do
-- 
2.35.3