nvme-fc: Fail transport errors with NVME_SC_HOST_PATH

NVME_SC_INTERNAL should indicate an internal controller errors
and not host transport errors. These errors will propagate to
upper layers (essentially nvme core) and be interpereted as
transport errors which should not be taken into account for
namespace state or condition.
Reviewed-by: NHannes Reinecke <hare@suse.com>
Reviewed-by: NJames Smart <james.smart@broadcom.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NSagi Grimberg <sagi@grimberg.me>

drivers/nvme/host/fc.c

@@ -1608,9 +1608,13 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
 				sizeof(op->rsp_iu), DMA_FROM_DEVICE);
 
 	if (opstate == FCPOP_STATE_ABORTED)
-		status = cpu_to_le16(NVME_SC_ABORT_REQ << 1);
-	else if (freq->status)
-		status = cpu_to_le16(NVME_SC_INTERNAL << 1);
+		status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
+	else if (freq->status) {
+		status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
+		dev_info(ctrl->ctrl.device,
+			"NVME-FC{%d}: io failed due to lldd error %d\n",
+			ctrl->cnum, freq->status);
+	}
 
 	/*
 	 * For the linux implementation, if we have an unsuccesful
@@ -1637,8 +1641,13 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
 		 * no payload in the CQE by the transport.
 		 */
 		if (freq->transferred_length !=
-			be32_to_cpu(op->cmd_iu.data_len)) {
-			status = cpu_to_le16(NVME_SC_INTERNAL << 1);
+		    be32_to_cpu(op->cmd_iu.data_len)) {
+			status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
+			dev_info(ctrl->ctrl.device,
+				"NVME-FC{%d}: io failed due to bad transfer "
+				"length: %d vs expected %d\n",
+				ctrl->cnum, freq->transferred_length,
+				be32_to_cpu(op->cmd_iu.data_len));
 			goto done;
 		}
 		result.u64 = 0;
@@ -1655,7 +1664,17 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
 					freq->transferred_length ||
 			     op->rsp_iu.status_code ||
 			     sqe->common.command_id != cqe->command_id)) {
-			status = cpu_to_le16(NVME_SC_INTERNAL << 1);
+			status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
+			dev_info(ctrl->ctrl.device,
+				"NVME-FC{%d}: io failed due to bad NVMe_ERSP: "
+				"iu len %d, xfr len %d vs %d, status code "
+				"%d, cmdid %d vs %d\n",
+				ctrl->cnum, be16_to_cpu(op->rsp_iu.iu_len),
+				be32_to_cpu(op->rsp_iu.xfrd_len),
+				freq->transferred_length,
+				op->rsp_iu.status_code,
+				sqe->common.command_id,
+				cqe->command_id);
 			goto done;
 		}
 		result = cqe->result;
@@ -1663,7 +1682,11 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
 		break;
 
 	default:
-		status = cpu_to_le16(NVME_SC_INTERNAL << 1);
+		status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
+		dev_info(ctrl->ctrl.device,
+			"NVME-FC{%d}: io failed due to odd NVMe_xRSP iu "
+			"len %d\n",
+			ctrl->cnum, freq->rcv_rsplen);
 		goto done;
 	}